Balancer device for internal combustion engine

专利摘要:
The present invention reduces the falling of lubricating oil on a reduction gear and a pump-driving gear that rotate and drive an oil pump, and limits the increase of resistance to rotation between the reduction gear and the pump-driving gear. A balancer device for an internal combustion engine is provided with a lower housing loaded with a balancer drive gear, a first balancer shaft comprising a first balance weight, a first gear, a second gear, a second balancer shaft comprising a second balance weight, and a reduction gear. The balancer device is also provided with an upper housing, which is formed in a shape that, when a pump-driving gear is engaged with the reduction gear and an oil pump is installed, covers the balancer drive gear, the first balancer shaft comprising the first balance weight, the first gear, the second gear, the second balancer shaft comprising the second balance weight, the reduction gear, and the pump-driving gear from above and which is installed on the lower housing. The balancer device is further provided with an exposing opening, which is formed in the upper housing and only exposes the balancer drive gear from the upper housing so as to be engaged with an engine gear.
公开号:ES2724910A2
申请号:ES201990032
申请日:2017-10-25
公开日:2019-09-17
发明作者:Masatoshi Matsuo；Masaharu Kitamura；Masahumi Kurita
申请人:Hitachi Automotive Systems Ltd；
IPC主号:

专利说明:

[0001]
[0002] BALANCING DEVICE FOR INTERNAL COMBUSTION ENGINE
[0003]
[0004] TECHNICAL FIELD
[0005]
[0006] The present invention relates to a balancing device for an internal combustion engine and, more specifically, to a balancing device for an internal combustion engine provided with an oil pump.
[0007]
[0008] BACKGROUND OF THE INVENTION
[0009]
[0010] In general, an internal combustion engine is provided with a balancing device configured so that a first balancing rod actuated by a crankshaft and a second balancing rod driven by its first balancing rod are rotatably contained. This balancing device serves to reduce the vibrations generated in the internal combustion engine. Balancing loads are provided on this first balancing rod and second balancing rod, respectively. To reduce the vibrations of the internal combustion engine, the first balancing rod and the second balancing rod are rotated at a rotation speed twice the rotation speed of the crankshaft and, the force of the inertia generated on the crankshaft is balanced with the force of the inertia generated in the first balancing rod and the second balancing rod.
[0011]
[0012] In addition, as described in JP 2010-230129A (patent literature 1), this balancing device is secured to a lower portion of a main body of the internal combustion engine to be placed on an oil pan. The first balancer rod of the two balancer rods is driven and rotated by the crankshaft and, the second balancer is driven by this first balancer rod by means of transmission gear means for synchronization and is configured to drive an oil pump.
[0013]
[0014] APPOINTMENT LIST
[0015]
[0016] PATENT BIBLIOGRAPHY
[0017] Patent Bibliography 1: JP 2010-230129A
[0018]
[0019] DESCRIPTION OF THE INVENTION
[0020]
[0021] TECHNICAL PROBLEM
[0022]
[0023] In this balancing device, the first balancing rod and the second balancing rod are arranged in parallel with each other and a gear transmission mechanism is provided, in which a first gear and a second gear are engaged respectively at one end of the first balancing rod and one end of the second balancing rod. The first gear and the second gear have an identical number of teeth and the first balancer rod and the second balancer rod are rotated synchronously at an identical rotation speed.
[0024]
[0025] A balancing transmission gear is provided at the other end of the first balancer rod, and a reducing gear is provided to drive the oil pump at the other end of the second balancer rod. This reduction gear is engaged with a pump transmission gear that is fixed to a rotating stem of the oil pump. An engine side gear that is rotated by the internal combustion engine is engaged with the balancing transmission gear of the first balancer rod. Therefore, when the engine side gear is rotated by the internal combustion engine, this rotation is transmitted in a sequence of the balancing transmission gear, the first balancer rod, the first gear, the second gear, the second rod balancer, gear reducer and transmission gear of the pump to finally rotate the oil pump.
[0026]
[0027] The balancing transmission gear, the first balancing rod, the first gear, the second gear, the second balancing rod and the reducing gear described above are mounted in a housing in the lower part and are covered with a housing of the upper part which it is combined with the housing of the lower part in such a way as to be placed in a space formed by these two housings.
[0028]
[0029] The gear on the motor side is geared from the top with the gear Balancing transmission. Therefore, an area of the housing of the upper part in which the balancing transmission gear and the pump transmission gear are positioned close to where the balancing transmission gear is located is cut so that it is open.
[0030]
[0031] The balancing device is placed in the oil pan at the bottom of the internal combustion engine. This configuration suffers from a phenomenon in which the dripping of lubricating oil from the internal combustion engine located above the balancing device is likely to fall from the open cut portion of the upper housing onto the balancing transmission gear and The transmission gear of the pump placed near the balanced transmission gear.
[0032]
[0033] Although this phenomenon is unavoidable since the balancing transmission gear meshes with the motor side gear, the lubricating oil that unnecessarily falls on the pump transmission gear provided to drive and rotate the oil pump increases the rotational resistance due to the viscosity of the lubricating oil in a gear portion between the transmission gear of the pump and the reduction gear. Especially in low temperature conditions, the lubricating oil has a high viscosity and, thus, the increased rotational resistance in terms of fuel consumption and the like is not insignificant.
[0034]
[0035] An object of the present invention is to provide a new balancing device for an internal combustion engine that minimizes the fall of lubricating oil on a pump transmission gear provided to drive and rotate an oil pump and, thus, suppresses an increase in rotational resistance in a gear portion between a reduction gear and the transmission gear of the pump.
[0036]
[0037] PROBLEM SOLUTION
[0038]
[0039] In accordance with one aspect of the present invention, a balancing device for an internal combustion engine includes a configuration, in which a balancing transmission gear, a first balancing rod that includes a balancing load, a first gear, a second gear, a second balancing rod that includes a balancing load and a reduction gear in a lower side housing; a housing in the upper part formed in such a way that it covers the balancing transmitter gear, including the first balancing rod that includes a balancing load, the first gear, the second gear, including the second balancing rod that includes a load of balanced, the reduction gear and a transmission gear of the pump of an oil pump from the top in the state in which the oil pump is assembled with the housing on the bottom side so that the transmission gear of the pump is gear with the reduction gear; and only the balancing transmission gear is exposed from an exposure opening formed in the housing of the upper part to engage with a gear on the motor side.
[0040]
[0041] In accordance with this aspect of the present invention, the components of the balancing device that exclude the exposure opening of the upper side housing but that include the transmission gear of the oil pump pump are covered by the upper side housing . This configuration suppresses the dripping of lubricating oil from the internal combustion engine from falling on the transmission gear of the pump provided to drive the oil pump and thus suppresses an increase in rotational resistance in a gear portion. between the reduction gear and the transmission gear of the pump.
[0042]
[0043] BRIEF DESCRIPTION OF THE DRAWINGS
[0044]
[0045] Fig. 1 is a cross sectional view illustrating a cross section of an internal combustion engine provided with a balancing device;
[0046] Fig. 2 is a cross-sectional view illustrating a balancing device sectioned in an axial direction according to a first embodiment of the present invention;
[0047] Fig. 3 is an exploded perspective view illustrating the balancing device shown in Fig. 2;
[0048] Fig. 4 is a view illustrating the balancing device shown in Fig. 2 with a top side housing separated therefrom;
[0049] Fig. 5 is a top view illustrating the balancing device that is shown in Fig. 2 with the upper side housing attached thereto;
[0050] Fig. 6 is a cross-sectional view illustrating a cross-section in a radial direction of the balancing device taken together with a surface A-A shown in Fig. 5;
[0051] Fig. 7 is an enlarged cross-sectional view of the main part illustrating an enlargement of the surroundings of a pump transmission gear shown in Fig. 1;
[0052] Fig. 8 is a top view illustrating a balancing device before being assembled with an oil pump according to a second embodiment of the present invention; Y
[0053] Fig. 9 is a top view illustrating the balancing device shown in Fig. 8 that is assembled with the oil pump and to which an oil protection wall is attached.
[0054]
[0055] DESCRIPTION OF THE EMBODIMENTS
[0056]
[0057] The following describes in detail embodiments of the present invention with reference to the drawings. The present invention, however, is not limited to the following embodiments but includes various modifications and applications based on the technical concept of the present invention within the scope of the present invention.
[0058]
[0059] Prior to the description of the embodiments of the present invention, the installation status of an internal combustion engine and a balancing device is first described with reference to Fig. 1. Fig. 1 is a cross-sectional view. vertical illustrating an internal combustion engine 01. The internal combustion engine 01 is, for example, a four-cylinder reciprocating internal combustion engine. A cylinder block 03 is provided under a cylinder head 02 and a bed 04 is fixed to a lower surface of the cylinder block 03. A crankshaft not illustrated rotatably rests on the bed 04 and is arranged so that its axial direction is along a front-rear direction of the internal combustion engine.
[0060]
[0061] The internal combustion engine 01 is mounted on a vehicle so that the crankshaft is arranged laterally with respect to a front-rear direction of a vehicle body An engine gear side not shown is fixed to a part of the crankshaft in the axial direction. The engine side gear is a transmission gear to drive the balancing device described below. Additionally, an oil pan 05 is mounted below the bed 04 to store lubricating oil therein. The balancing device 10 configured to suppress secondary vibrations of the internal combustion engine 01 is placed inside the oil pan 05 to soak in the lubricating oil.
[0062]
[0063] The balancing device 10 includes a housing of the upper part, a housing of the lower part, a main body of the balancing and an oil pump 11 as described in detail below. The housing of the upper part and the housing of the lower part are fixed to a lower surface of the bed 04 by means of a plurality of fixing bolts of the balancer 06 to be placed one above the other in a vertical direction. The oil pump 11 is coupled and integrated with the balancing device 10 by means of a plurality of oil pump fastening bolts 07. The oil pump 11 is a variable displacement oil pump that changes the amount of volume change of a pump chamber according to a predetermined operating condition.
[0064]
[0065] The variable displacement oil pump that is used in accordance with the embodiment is a vane pump that has a mechanism for reducing the amount of volume change of the pump chamber at the high pump rotation speed and can be, for example, a known pump described in JP 2011-111926A or the like. The oil pump 11 is fixed to the front part of the housing of the lower part by a plurality of oil pump fastening bolts 07. The oil pump 11 is mounted in the housing of the lower part and, consequently, has a high rigidity of support.
[0066]
[0067] As shown in Fig. 1, the balancing device 10 is placed in the oil pan 05 at the bottom of the internal combustion engine. Therefore, the conventional balancing device 10 is likely to suffer from such a phenomenon that the lubricating oil dripping from the internal combustion engine 01 located on top of the balancing device 10 falls on the balancing transmission gear and a pump transmission gear placed close of the balanced transmission gear. Lubricating oil that falls unnecessarily on the transmission gear of the pump provided to drive and rotate the oil pump increases rotational resistance due to the viscosity of the lubricating oil in a gear portion between the transmission gear of the pump and a gear reducer. Especially in low temperature conditions, the lubricating oil has a high viscosity and the increased resistance in terms of fuel consumption and the like is not insignificant.
[0068]
[0069] The embodiment proposes a configuration that minimizes the possibility that the lubricating oil falls on the transmission gear of the pump provided to drive and rotate the oil pump 11 and suppresses an increase in rotational resistance in the gear portion between the gear gear reducer and pump drive gear. The following describes the balancing device for the internal combustion engine according to the embodiment.
[0070]
[0071] REALIZATION 1
[0072]
[0073] A first embodiment of the present invention is described in detail with reference to Figs. 2 to 7. Fig. 2 illustrates a cross section in an axial direction of the balancing device 10. The left side of the drawing corresponds to a front side of a vehicle and the right side of the drawing corresponds to a rear side of a vehicle. The balancing device 10 is fixed to the bed 04 as shown in Fig. 1.
[0074]
[0075] In Fig. 2, the oil pump 11 is fixed on the rear side of the balancing device 10 and is driven and rotated by a second balancing rod constructed in the balancing device 10. The balancing device 10 is configured so that a main body of the balancer is accommodated in a housing space formed by a housing of lower part 12 and a housing of upper part 13. Fig. 2 illustrates a cross section on one side of the first balancing rod 14. A transmission gear of Balanced 15 is fixed at one end of the first balancer rod 14 on the side of the oil pump 11. This balanced transmission gear 15 is driven and rotated by a gear on the engine side (reference is made to a gear on the side of the engine 30 shown in Fig. 6) which is rotated by a crankshaft.
[0076] A first gear 16 included in a gear transmission mechanism is attached to the other end of the first balancer rod 14 and is configured to engage with a second gear fixed with the second balancer rod not illustrated. Additionally, a first balancing load 17 is provided on the first balancing rod 14 placed between the balancing transmission gear 15 and the first gear 16. A portion between the first balancing load 17 and the first gear 16 is supported by a first front side bearing 18. A portion between the balancing load 17 and the balancing transmission gear 15 is supported by a first rear side bearing 19.
[0077]
[0078] A transmission gear of the pump 20 is fixed to a rotating rod of the oil pump 11 and is rotated by a reduction gear that is fixed to one end of the second balanced rod not illustrated. This transmission gear of the pump 20 is integrated with the oil pump 11 and is assembled with the balancing device 10 to engage with the reduction gear. Accordingly, the transmission gear of the pump 20 is configured to be positioned between the oil pump 11 and the end faces of the side of the oil pump 11 of the housing of the lower part 12 and the housing of the upper part 13. In in other words, the transmission gear of the pump 20 is placed in a space formed by the contact of an oil receiving portion 29 provided at the end of the oil pump side 11 of the lower side housing 12 with the pump oil 11 in a direction of a rotational axis of the first balancer rod 14.
[0079]
[0080] An exposure aperture 21 is formed in an area where the balancing transmission gear 15 of the upper housing 13 is placed. Part of the balancing transmission gear 15 protrudes upwardly from the exposure opening 21 to be exposed. This configuration allows the balancing transmission gear 15 to engage with the motor side gear. An oil protection wall 22 is formed in the housing of the upper part 13 to be located on the side of the oil pump 11 of the exposure opening 21 and is configured to cover the transmission gear of the pump 20 from the top The details of this oil protection wall 22 will be described below with reference to Figs. 4 to 7.
[0081] Fig. 3 is an exploded perspective view illustrating respective components of the balancing device 10 shown in Fig. 2. The main body of the balancer, configured to suppress the vibrations of the internal combustion engine, is housed in the space housing formed by the lower housing 12 and the upper housing 13. Additionally, the oil pump 11 is fixed on the rear side which is the left side of the drawing.
[0082]
[0083] The main balancing body includes a first rotation system that has a balancing load and a second rotation system that has a balancing load and is configured so that the rotation of the first rotation system is reversed by the transmission mechanism of gears to rotate the second rotation system. The rotations of the first rotation system and the second rotation system generate a vibration force or, more specifically, a vibration force in a phase opposite to the phase of a secondary component of a vibration force of the internal combustion engine caused by reciprocating movements of a piston, to reduce the vibrations of the internal combustion engine.
[0084]
[0085] The first rotation system includes the balancing transmission gear 15 and the first gear 16 fixed to the respective ends of the first balancer rod 14, the first rear side bearing 18 and the first front side bearing 19 configured to support the first rod balancer 14 and the first balancing load 17 provided on the first balancer rod 14, as described above. The first bearing on the rear side 18 and the first bearing on the front side 19 are fixed and supported between the housing of the lower part 12 and the housing of the upper part 12, so as to rotate and support the first balancing rod 14. Balancing transmission 15 and the first gear 16 are rotatably housed in the housing space between the housing of the lower part 12 and the housing of the upper part 12.
[0086]
[0087] The second rotation system includes, on the other hand, a reduction gear 24 and a second gear 25 fixed to the respective ends of a second balancing rod 23, a second rear side bearing 26 and a second front side bearing 27 configured to support the second balancer rod 23 and a second balancing load 28 provided on the second balancing rod 23. The reduction gear 24 engages with the transmission gear pump 20 that is fixed to the rotating rod of the oil pump 11, to rotate the transmission gear of the pump twenty.
[0088]
[0089] The second bearing on the rear side 26 and the second bearing on the front side 27 are fixed and supported between the housing of the lower part 12 and the housing of the upper part 12, to rotate and support the second balancing rod 23. The reduction gear 24 and the second gear 25 are rotatably housed in the housing space between the housing of the lower part 12 and the housing of the upper part 12. The transmission gear of the pump 20 is fixed entirely to the oil pump 11 and concealed , therefore, so that it cannot be seen in the drawing in Fig. 3.
[0090]
[0091] The oil receiving portion 29 which is formed entirely with the lower side housing 12 is provided on the end of the oil pump side 11 of the lower side housing 12. The reduction gear 24 and the transmission gear of the pump 20 are placed above the oil receiving portion 29. Similarly, the oil protection wall 22 which is formed entirely with the housing of the upper side 13 is provided on the end of the side of the oil pump 11 of the lower side housing 13. The reduction gear 24 and the transmission gear of the pump 20 are placed below the oil protection wall 22. Accordingly, the reduction gear 24 and the transmission gear of the pump 20 are placed vertically between the oil receiving portion 29 and the oil protection wall 22.
[0092]
[0093] The rotation of the gear on the engine side fixed to the crankshaft which is located above the balancing device 10 rotates the balancing transmission gear 15 at a rotation speed twice the rotation speed of the gear on the engine side and also make rotate the first balancing rod 14 to which the balancing transmission gear 15 is fixed. The rotation of the second gear 25 engaging with the first gear 16 that is fixed to the first balancing rod 14 rotates the second balancing rod 23 which is set in phase with respect to the first balancing rod 14, to generate a balancing vibration force. This balancing device 10 generates the vibration force in the opposite phase to the phase of the secondary component of the vibration force of the internal combustion engine caused by reciprocating movements of the piston, to reduce the vibrations of the internal combustion engine. This type of balancing device 10 is well known.
[0094]
[0095] In accordance with the embodiment, as shown in Figure 2 and Figure 3, the oil protection wall 22 provided to cover the top of a transmission gear of the pump 20, which is fixed to the rotating rod of the pump oil 11, in the state in which the oil pump 11 is assembled with the balancing device 10 is formed in the housing of the upper side 13. The configuration that the oil protection wall 22 has formed entirely with the housing of the side upper 13 is arranged to cover the upper side of the transmission gear of the pump 20 suppresses that the lubricating oil dripping from the internal combustion engine 01 and falls on the oil protection wall 22 of the upper side housing 13 from flowing towards the transmission gear of the pump 20.
[0096]
[0097] This configuration suppresses that the transmission gear of the pump 20 is directly exposed to the lubricating oil and suppresses an increase in the rotational resistance caused by the exposure of the gear portion between the transmission gear of the pump 20 and the reduction gear 24 with the lubricating oil.
[0098]
[0099] The configuration of this oil protection wall 22 is further described. Fig. 4 is a top view illustrating the state in which the housing of the upper side 13 is separated from the balancing device 10 with the oil pump 11 assembled therewith.
[0100]
[0101] The balancing transmission gear 15 and the first gear 16 are fixed to the respective ends of the first balancer rod 14. The first balancer rod 14 is supported by the first bearing on the rear side 18 and the first bearing on the front side 19. It is provided the first balancing load 17 on the first balancer rod 14 between the first bearing on the rear side 18 and the first bearing on the front side 19.
[0102]
[0103] Similarly, the second gear 25 and reduction gear 24 are fixed to the respective ends of the second balancer rod 23 which is placed in parallel to the first balancer rod 14. The second balancer rod 23 is supported by the second bearing on the rear side 26 and the second bearing on the front side 27. The second balancing load 28 is provided on the second balancer rod 23 between the second bearing from the rear side 26 and the second bearing from the front side 27. The second gear 25 is rotated by the first gear 16. This rotates the second balancer rod 23 and further rotates the reduction gear 24.
[0104]
[0105] The balancing transmission gear 20 fixed to the rotating rod of the oil pump 11 is provided between the oil pump 11 and the balancing transmission gear 15 is fixed to the first balancing rod 14. This transmission gear of the pump 20 is positioned adjacent to the balancing transmission gear 15. In addition, the transmission gear of the pump 20 is engaged with the reduction gear 24 and is arranged to be flush with the reduction gear 24 in a radial direction.
[0106]
[0107] Fig. 5 illustrates an upper surface in the state in which the housing of the upper side 13 is mounted to the balancing device 10 shown in Fig. 4. Fig. 6 illustrates a cross section in the radial direction taken together with an AA surface shown in Fig. 5.
[0108]
[0109] In Fig. 5 and Fig. 6, the exposure aperture 21 is formed in the vicinity of the balancing transmission gear 15 of the upper housing 13. Part of the balancing transmission gear 15 is exposed from this exposure opening 21. This configuration causes an engine-side gear 30 to engage with the balancing drive gear 15 exposed as shown in Fig. 6.
[0110]
[0111] The oil protection wall 22 provided to cover the transmission gear of the pump 20 and the reduction gear 24 from the top is formed between the exposure opening 21 and the oil pump 11 or more specifically between the exposure opening 21 and the end of the oil pump side 11 of the upper side housing 13. Accordingly, in the state assembled with the oil pump 11, the housing at the top 13 is formed such that it covers the transmission gear of balanced 15, the first balancer rod 14, the first gear 16, the second gear 25, the second balancer rod 23, the reduction gear 24 and the transmission gear of the pump 20 and is combined with the housing of the lower side 12.
[0112]
[0113] As described above, an end face 22E of the side of the oil pump 11 (shown in Fig. 7) of the housing of the upper side 13 extends beyond the transmission gear of the pump 20 and the reduction gear 24 towards the side of the oil pump 11 and the portion of the housing of the upper side 13 which covers the transmission gear of the pump 20 and the reduction gear 24 serves as the oil protection wall 22. Accordingly, the protection wall of oil 22 can be understood as part of the housing of the upper side 13.
[0114]
[0115] Furthermore, to drive the main body of the balancer, only the balancing transmission gear 20 is exposed from the exposure opening 21 formed in the housing of the upper part 13 to engage with the gear on the motor side 30. The length of the exposure opening 21 in the radial direction of the balancing transmission gear 15 is determined in accordance with the degree of exposure of the balancing transmission gear 20. The length of the exposure opening 21 is increased with an increase in the degree of exposure.
[0116]
[0117] This configuration means that the components of the balancing device 10 that exclude the exposure opening 21 of the upper side housing 13 but that include the transmission gear of the oil pump pump 20 11 are covered by the upper side housing 13 which completely forms the oil protection wall 22. This configuration suppresses the dripping of lubricating oil from the internal combustion engine 01 from falling on the transmission gear of the pump 20 provided to drive the oil pump 11 and suppresses an increase in the rotational resistance in the gear portion between the reduction gear 24 and the transmission gear of the pump 20. The lubricating oil received by the oil receiving portion 29 provided to reach a surface where the lower side housing 12 comes into contact with the housing on the upper side 13 is discharged from a discharge port 123 q It is formed between an upper end portion 12C of the oil receiving portion 29 and the upper side housing 13, by rotating the transmission gear of the pump 20. The lubricating oil received by the portion of oil receiving 29 scrapes upwardly from the upper side housing 13 by rotating the transmission gear of the pump 20 and the reduction gear 24. The oil protection wall 22 blocks the scraped lubricating oil upwards and suppresses that the Lube oil returns to the crankshaft that is provided to drive and rotate the gear on the engine side 30. This configuration suppresses an increase in the rotating resistance of the crankshaft.
[0118]
[0119] Fig. 7 is an enlarged cross-sectional view illustrating the proximities of the exposure opening 21. The balancing transmission gear 15 protrudes upwardly from the exposure opening 21 to be exposed and engages with the gear on the side of the Engine 30 (not shown). The oil protection wall 22 is formed adjacent to the exposure opening 21. The end portion 22E of the oil protection wall 22 (in other words, the end of the upper side housing 13) is disposed adjacent to one end. of the oil pump 11. A bottom clearance 31 is formed between the end portion 22E and the end of the oil pump 11 in the direction of a rotational axis of the first balancer rod 14. This bottom clearance 31 is used as a gap to discharge, by centrifugal force, the lubricating oil that enters a part of the transmission gear of the pump 20.
[0120]
[0121] Referring again to Fig. 6, the oil receiving portion 29 provided in the lower side housing 12 comes into contact with the oil pump 11 to form a space between the lower side housing 12 and the oil pump 11 to accommodate the reduction gear 24 and the transmission gear of the pump 20. This configuration suppresses the lubricating oil accumulated in the oil pan between the oil receiving portion 29 and the oil pump 11 in a space where the reduction gear 24 and the pump transmission gear 20 are housed. This configuration therefore suppresses an increase in rotational resistance caused by the exposure of the reduction gear 24 and the transmission gear of the pump 20 with respect to the lubricating oil. .
[0122]
[0123] The balancing device 10 is configured such that only the oil receiving portion 29 provided in the lower side housing 12 serves as the contact portion that is a clamping point with the oil pump 11 and that the clearance of bottom is provided between oil pump 11 and end 22E of the oil protection wall 22 of the upper side housing. In the manufacturing process the balancing device 10, there is no need for processing to cause the end 22E of the oil protection wall 22 to be scraped off with the contact surface of the portion receiving oil 29 with the oil pump 11 after the housing of the upper side 13 and the housing of the lower side 12 have been secured together by means of a plurality of balancing clamping bolts 06. As a result, this improves the productivity of the balancing device 10.
[0124]
[0125] As shown in Fig. 5 and Fig. 6, the oil protection wall 22 constituting the upper side housing 13 is formed to connect cylinder block holding portions of the right and left rear side 13L and 13R to each other. . This configuration reduces a moment applied to the oil pump 21 due to vibrations during the operation of the oil pump 11. The oil protection wall 22 also enhances the rigidity of the upper side housing 13.
[0126]
[0127] Such functions decrease the deviation of the housing of the balancing device 10 and suppresses the misalignment of the gear teeth gear between the reduction gear 24 fixed to the second balancing rod 23 and the transmission gear of the pump 20 fixed to the rotating rod of the pump oil 11.
[0128]
[0129] This avoids, therefore, a partial contact of the surface of the teeth of the gear caused by the deterioration of the state of the gearing due to the state of the misalignment of the gear teeth between the reduction gear 24 and the transmission gear of the pump 20. This, therefore, suppresses the reduction of the sound vibration performance caused by poor tooth contact and improves the life of the gear through proper tooth contact.
[0130]
[0131] As described above, according to the embodiment, in the state that the balancing transmission gear, including the first balancing rod that includes a balancing load, the first gear, the second gear, including the second rod of balancing that includes the balancing load, and the reduction gear are mounted on the lower side housing and that the oil pump is additionally assembled with it and the pump transmission gear is geared with the reduction gear, the housing in the upper part formed in such a way that it covers the balancing transmitter gear, including the first balancing rod that includes a balancing load, the first gear, the second gear, including the second balancing rod that includes a balancing load, the gear gearbox and transmission gear of the oil pump pump from the top is assembled with the housing of the bottom. Only the balancing transmission gear is exposed from the exposure opening formed in the upper housing to engage with the gear on the motor side.
[0132]
[0133] The components of the balancing device that exclude the exposure opening of the upper side housing but that include the transmission gear of the pump are covered by the upper side housing. This configuration suppresses the dripping of lubricating oil from the internal combustion engine from falling on the transmission gear of the pump provided to drive the oil pump during operation of the internal combustion engine and suppresses an increase in rotational resistance in the portion of gear between the reduction gear and the transmission gear of the pump.
[0134]
[0135] REALIZATION 2
[0136]
[0137] The following describes a second embodiment of the present invention. The first embodiment describes the configuration in which the oil protection wall 22 is formed entirely with the housing of the upper side 13. This embodiment, on the other hand, describes a configuration that an oil protection wall 33 is formed separately from the upper side housing 13 and fixed to the upper side housing 13 after the oil pump 11 is assembled therewith.
[0138]
[0139] Fig. 8 is a top view illustrating a balancing device 10 before an oil pump 11 is assembled therewith. A housing on the upper side 13 has an open area 32 that is formed by cutting a location in which the transmission gear of the pump 20 is located, in addition to an exposure opening 21. The assembly of the oil pump 11 with the device Balancing 10 in this state provides the assembly configuration shown in Fig. 4 omitting the housing on the upper side 13 of the illustration. In that case, the presence of the open area 32 allows the oil pump 11 to be assembly from the upper side by the opening region 32 in the state in which the housing of the upper side 13 is assembled with the housing of the lower side 12.
[0140]
[0141] Fig. 9 illustrates the state in which the open area 32 of the upper side housing 13 is closed by the oil protection wall 33 formed separately after the oil pump 11 has been assembled therewith. The oil protection wall 33 can be formed in any shape and can be fixed by a fixing method, for example, bolt fixing or welding fixing. This embodiment employs fixing with bolts taking into account their repair or the like. Bolt fixing requires blocking, to prevent bolts from loosening due to internal combustion engine vibrations.
[0142]
[0143] Like the first embodiment, according to this embodiment, the components of the balancing device 10 that exclude the exposure opening 21 of the upper side housing 13 but which include the transmission gear of the pump 20 of the oil pump 11 are covered by the oil protection wall 33 and the upper side housing 13. This configuration suppresses the dripping of lubricating oil from the internal combustion engine 01 from falling on the transmission gear of the pump 20 provided to drive the oil pump 11 and suppresses an increase in rotational resistance in the gear portion between the reduction gear 24 and the transmission gear of the pump 20.
[0144]
[0145] The configuration of this embodiment also allows the oil pump 11 to be assembled from the upper side by the opening region 32 provided in the housing of the upper side 13. This configuration, therefore, has advantageous effects of simplifying the process of assembly and reduction of assembly workload.
[0146]
[0147] According to an embodiment of the present invention described above, in the state that the balancing transmission gear, including the first balancing rod that includes a balancing load, the first gear, the second gear, including the second rod of balancing that includes the balancing load, and the reduction gear are mounted on the lower side housing and that the oil pump is additionally assembled with it and the gear Transmission of the pump is geared with the reduction gear, the housing at the top formed in such a way that it covers the balancing transmitter gear, including the first balancing rod that includes a balancing load, the first gear, the second gear, including the second balancing rod that includes a balancing load, the reduction gear and the transmission gear of the oil pump pump from the top is assembled with the housing of the bottom. Only the balancing transmission gear is exposed from the exposure opening formed in the upper housing to engage with the gear on the motor side.
[0148]
[0149] The components of the balancing device that exclude the exposure opening of the upper side housing but that include the transmission gear of the pump are covered by the upper side housing. This configuration suppresses the dripping of lubricating oil from the internal combustion engine from falling on the transmission gear of the pump provided to drive the oil pump and suppresses an increase in rotational resistance in the gear portion between the reduction gear and The transmission gear of the pump.
[0150]
[0151] The present invention is not limited to the embodiments described above but includes various modifications. For example, the embodiments described above are in order to facilitate the understanding of the present invention and are not necessarily limited to the configurations that include all the components described above. Part of the configuration of a certain embodiment can be replaced by the configuration of another embodiment. The configuration of another embodiment can be added to the configuration of a certain embodiment. Another configuration can be added to part of the configuration of each of the embodiments or part of the configuration of each of the embodiments can be deleted or replaced by another configuration.
[0152]
[0153] The present application claims priority of Japanese patent application No. 2016-215950 filed on November 4, 2016. The entire invention, including the specification, the claims, the drawings and the summary of the patent application Japanese No. 2016-215950 filed on November 4, 2016 is incorporated by reference to this application.
[0154] LIST OF REFERENCE SYMBOLS
[0155]
[0156] 10 ... balancing device, 11 ... oil pump, 12 ... lower side housing, 13. upper side housing, 14. first balancing rod, 15. balancing transmission gear, 16. first gear , 17. first balancing load, 18. first front-side bearing, 19. first rear-side bearing, 20. pump drive gear, 21. exposure opening, 22. oil protection wall, 23. second balancer rod, 24. reduction gear, 25. second gear, 26. second front side bearing, 27. second rear side bearing, 28. second balancing load, 29. oil receiving portion, 30. engine side gear.

权利要求:
Claims (5)
[1]
1. A balancing device for an internal combustion engine, the balancing device comprising:
a first balancer rod that includes an end to which a geared balancing transmission gear is fixed with an engine side gear that is rotated by the internal combustion engine and an opposite end to which a first gear is fixed, including the first balancing rod additionally a first balancing load provided between the balancing transmission gear and the first gear;
a second balancer rod that includes an end to which a second gear meshed with the first gear is attached and an opposite end to which a gear reducer meshed with a transmission gear of the pump of an oil pump is attached, including the second rod additionally a second balancing load provided between the second gear and the reduction gear;
a housing of the lower part on which the balancing transmission gear is mounted, including the first balancing rod that includes a first balancing load, the first gear, the second gear, the second balancing rod that includes the second load of balancing and reducing gear;
a housing in the upper part formed in such a way that it covers the balancing transmitter gear, including the first balancing rod that includes a first balancing load, the first gear, the second gear, including the second balancing rod the second load of balanced, the reduction gear and the transmission gear of the pump from the top in a state where the oil pump is assembled with the housing on the upper side so that the transmission gear of the pump is geared with the gear reduction , the housing of the upper part being assembled with the housing of the lower part; Y
an exposure aperture formed in the upper housing so that only the balancing transmitter gear is exposed from the upper housing to engage with the gear on the motor side.
[2]
2. The balancing device for the internal combustion engine according with claim 1, wherein one end of the housing of the upper part serves as an oil protection wall covering the reduction gear and the transmission gear of the pump from the top, to suppress the dripping of lubricating oil from the internal combustion engine falls on the reduction gear and the transmission gear of the pump.
[3]
3. The balancing device for the internal combustion engine according to claim 2,
wherein an oil receiving portion is formed at one end of the bottom housing to receive the lubricating oil flowing in the reduction gear and in the transmission gear of the pump, and
The reduction gear and the transmission gear of the pump are located between the oil protection wall and the oil receiving portion.
[4]
4. A balancing device for an internal combustion engine, the balancing device comprising:
a first balancing rod that includes an end to which a geared balancing transmission gear is fixed with an engine side gear that is rotated by the internal combustion engine, and an opposite end to which a first gear is fixed, including the first balancing rod additionally a first balancing load provided between the balancing transmission gear and the first gear;
a second balancing rod that includes an end to which a second gear meshed with the first gear is fixed, and an opposite end to which a gear reducer meshed with a gear transmission of the pump of an oil pump is attached, including the second balancing rod additionally a second balancing load provides between the second gear and the reducing gear;
a housing of the lower part on which the balancing transmission gear is mounted, the first balancing rod including the first balancing load, the first gear, the second gear, the second balancing rod including the second balancing load, and the reduction gear; a housing in the upper part formed in such a way that it covers the balancing transmitter gear, the first balancing rod including the first balancing load, the first gear, the second gear, the second rod of balancing including the second balancing load, and the reduction gear from the top in a state in which the oil pump is assembled with the housing of the top so that the transmission gear of the pump is geared with the gear reducer and in a way in which it has an open area above the transmission gear of the pump, to the housing of the upper part that is assembled with the housing of the lower part;
an oil protection wall formed separately from the housing of the upper part and fixed to a housing of the upper part to close the open area; Y
an exposure aperture formed in the upper housing so that only the balancing transmitter gear is exposed from the upper housing to engage with the gear on the motor side.
[5]
5. A balancing device for an internal combustion engine, the balancing device comprising:
a first balancing rod that includes an end to which a geared balancing transmission gear is fixed with an engine side gear that is rotated by the internal combustion engine, and an opposite end to which a first gear is fixed, including the first balancing rod additionally a first balancing load provided between the balancing transmission gear and the first gear;
a second balancing rod that includes an end to which a second gear meshed with the first gear is fixed, and an opposite end to which a gear reducer meshed with a gear transmission of the pump of an oil pump is attached, including the second balancing rod additionally a second balancing load provided between the second gear and the reduction gear;
a housing of the lower part on which the balancing transmission gear is mounted, the first balancing rod including the first balancing load, the first gear, the second gear, the second balancing rod including the second balancing load and the reduction gear; a housing in the upper part formed in such a way that it covers the balancing transmitter gear, the first balancing rod including the first balancing load, the first gear, the second gear, the second balancing rod including the second balancing load, the reduction gear and the Transmission gear of the pump from the top in a state in which the oil pump is assembled with the housing on the upper side so that the transmission gear of the pump is engaged with the reduction gear, to the housing of the top which is assembled with the bottom housing;
an exposure opening formed in the housing of the upper part to expose the balancing transmission gear;
An oil protection wall provides adjacent to the exposure opening to cover the reduction gear and the transmission gear of the pump, a clearance that is formed between the oil protection wall and the oil pump in a direction of a rotational axis of the first balancing rod; Y
an oil receiving portion configured to cover the reduction gear and the transmission gear of the pump in a circumferential direction with respect to the rotational axis of the balancer rod and to bring the oil pump into contact in the direction of the rotational axis of the balancer rod .

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同族专利:

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公开号 | 公开日

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CN109844361B|2021-10-22|

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US20200063612A1|2020-02-27|

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ES2724910B2|2020-05-11|

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WO2018084045A1|2018-05-11|

---

MX2019005193A|2019-08-05|

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JP6776369B2|2020-10-28|

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CN109844361A|2019-06-04|

---

ES2724910R1|2019-10-28|

---

JPWO2018084045A1|2019-07-11|

---

US10907516B2|2021-02-02|

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法律状态:
2019-09-17| BA2A| Patent application published|Ref document number: 2724910 Country of ref document: ES Kind code of ref document: A2 Effective date: 20190917 |

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2021-12-27| PC2A| Transfer of patent|Owner name: HITACHI ASTEMO, LTD. Effective date: 20211227 |

优先权:

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申请号 | 申请日 | 专利标题

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JP2016215950|2016-11-04|

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PCT/JP2017/038474|WO2018084045A1|2016-11-04|2017-10-25|Balancer device for internal combustion engine|

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