• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a discharge valve (1) for discharging a hydraulic fluid from a high (7) into a low-pressure region (33), in particular for a hydraulic drive circuit of a VCR connecting rod, comprising a base body (2), a sleeve-shaped housing (US Pat. 3) with a valve seat (9), a housing (3) displaceably guided closing body (4) which is biased by a valve spring (6) against the valve seat (9), a valve seat (9) upstream upstream throttle body (30) and an actuating device (22) arranged on the low-pressure side and moving the closing body (4) from a closed to an open position. To improve such a drain valve (1), the throttle point (30) upstream of the closing body (4) is arranged such that the throttle point (30) in the transition region of the base body (2) and the sleeve-shaped housing (3) and / or in the wall is formed of the sleeve-shaped housing (3) and the valve spring (6) is arranged as part of the actuating device (22) on the low pressure side downstream of the valve seat (9). The invention also relates to an insert for a drain valve and a VCR connecting rod with at least one such drain valve.
    公开号:AT519932A2
    申请号:T50402/2018
    申请日:2018-05-14
    公开日:2018-11-15
    发明作者:Riba Zóltan；Heller Malte；Latz Steffen
    申请人:Avl List Gmbh；Iwis Motorsysteme Gmbh & Co Kg；
    IPC主号:
    专利说明:

    Drain valve for high pressures
    The present invention relates to a discharge valve for discharging a hydraulic fluid from a high-pressure region into a low-pressure region, in particular for a hydraulic drive circuit of a VCR connecting rod, comprising a base body, a sleeve-shaped housing inserted into the base body with a valve seat, a closing body movably guided in the housing, a valve spring biasing the closing body against the valve seat, a valve seat upstream upstream throttling point and a closing body from a closed to an open position, arranged on the low pressure side, arranged actuating device.
    There are hydraulic applications in which the function of a directional control valve, such as a 3/2-way valve, must be represented, with the blocked lines are under very high pressure and to the high tightness of the system must be ensured. Such an application is e.g. the hydraulic drive circuit of a VCR (variable compression ratio) connecting rod, that is, a length-adjustable connecting rod for an internal combustion engine. The hydraulic drive circuit used for this purpose uses drain valves, which are to discharge hydraulic fluid from a previously closed pressure chamber. Usually, the adjustment of the connecting rod from the short to the long position or vice versa due to mass and gas forces occur, with a hydraulic blocking of the respective position takes place. This hydraulic lock is released by opening the discharge valve associated with the respective blocking pressure chamber. The VCR connecting rod is constantly loaded with tension and pressure. Accordingly, in the Druckkamer and the associated lines to the drain valve and the closing body a swelling pressure of over 300 bar. This results in very high demands on the components of the hydraulic control circuit, in particular the drain valves. These must be sufficiently durable and yet be accommodated in the available small space. The weakening of the VCR connecting rod should be as low as possible due to the space required for the drain valve. Furthermore, the leakage of the sealed line or the sealed pressure chamber should be as low as possible. Gap seals, such as those used in control valves with gate valves, are therefore rather impractical for the required blocking of a VCR connecting rod. However, it must be possible to be able to reasonably open the closing body in spite of the high pressure forces occurring in the closed line or in the blocked pressure chamber.
    It is therefore an object of the present invention to provide a drain valve of the type mentioned, which is robust and is very easy to operate even at high pressures or pressure differences.
    For this purpose, the invention provides that the throttle point is formed in the transition region of the base body and the sleeve-shaped housing and / or in the wall of the sleeve-shaped housing, and the valve spring is arranged as part of the actuating device on the low pressure side downstream of the valve seat. First of all, a throttle point is provided as part of the drain valve, which automatically arises by inserting the sleeve-shaped housing in the base body. This throttle point is tuned to the expected maximum system pressure so that at the throttle point such a large pressure drop arises that the closing body can be very easily opened against this reduced pressure. As a result, much lower holding forces are required to open the closing body. A special feature is therefore that very high pressure differences, which can also act swelling on the drain valve, are reduced. In order to reduce the force on the closing body and to prevent large volume flows, a throttle point is connected upstream of the actual valve seat and the associated valve opening. If the drain valve is opened, advantageously only a small part of the pressure drops on the closing body. The advantage becomes the greater, the greater the pressure difference, which drops at the upstream throttle point. It is also advantageous that the actuating device, including the valve spring, is arranged on the low-pressure side downstream of the valve seat. As a result, the most diverse controls can be used and trained. The actuating device accordingly controls the closing body, the actuating force depends on the design and direction of movement of the actuating device. A single actuator may also be associated with multiple drain valves. The arrangement of the valve spring on the low pressure side also opens the possibility to couple the closing body with the sleeve-shaped housing captive. Then, the closing body, the housing and the valve spring can form a preassembled unit (e.g., an insert) that can be tested by itself. This pre-assembly unit can then be inserted into a bore in the base body and e.g. be sealed tight with a screw cap. The term "actuator" should be understood as wide as possible and for all types of control of the closing body from the low pressure side.
    As already mentioned, it is of particular advantage if the valve spring captively couples the closing body with the sleeve-shaped housing, so that they form an installation unit.
    Furthermore, on the low-pressure side on the closing body, as part of the actuating device, an actuating tappet with a supporting surface spaced from the closing body can be provided, the valve spring being arranged between a low-pressure side of the sleeve-shaped housing and the closing surface. Since the valve spring is now supported between the housing and the support surface, it pulls the closing body on the valve seat and closes it with a predetermined spring force. At the same time, this spring force is also the holding force with which the coupling of these parts takes place.
    According to a variant, the throttle point may be configured such that the pressure difference that occurs at the throttle point is at least three times greater than the pressure difference between the open closing body and the valve seat or associated valve opening. The pressure therefore falls mainly before the closing body. For this purpose, a narrowed flow cross-section is provided, which throttles the flow of oil. The closing body experiences thereby only a relatively small pressure load and the holding force for holding the closing body in the open position is low. This difference is achieved by a suitably selected aspect ratio. The loss factor of the throttle point is much higher than that of the actual valve on the valve seat. The throttle point can be generated in the interaction between the base body and the sleeve-shaped housing or by the housing itself.
    In one embodiment, the restriction may e.g. be formed by an annular gap between the sleeve-shaped housing and the base body. Accordingly, the hydraulic fluid must flow through this annular gap and then a possibility must be created that the hydraulic fluid flows into the sleeve-shaped housing. For this, e.g. an inlet bore in the base body terminate on the outer surface of the valve housing. At this point, then the valve housing has a change in the outer diameter, so that at the top of said annular gap forms with the receiving bore in the base body. When flowing through the annular gap, the hydraulic fluid undergoes a pressure loss. The hydraulic fluid may then flow into the housing through the end openings (e.g., grooves) and over the opened closing body.
    But there is also the possibility that the throttle point is formed by at least one opening, in particular a precision bore, in the wall of the sleeve-shaped housing. Such precision bores can be produced very precisely, which is why the Dros selwirkung very precisely predeterminable. With e.g. the sleeve-shaped housing can be installed undirected with respect to its rotational position, the distribution of hydraulic fluid from the inlet bore can be made via a groove. This groove may be in the base body or in the sleeve-shaped housing, or both, attached. Usually, the variant with the groove on the outside of the valve housing is easier to manufacture, but leads to a larger overall diameter of the valve housing, which in turn is disadvantageous at very high pressure values.
    Of course, the sleeve-shaped housing must also be sealed relative to the base body such that an outflow of the hydraulic fluid takes place mainly or completely via the valve seat or the valve opening.
    The closing body is guided longitudinally displaceable in the sleeve-shaped housing. So that there is no tilting of the closing body at the high load present here, according to a further embodiment, the closing body is guided on at least two guide surfaces arranged at an axial distance from each other. As a rule, there is a guide surface within the sleeve-shaped housing, while the other guide surface does not necessarily have to be arranged in the housing. Preferably, these guide surfaces are not located on a portion of the closing body with the same diameter. Conveniently, the closing body may have a conical closing surface and the valve seat a corresponding conical shape. For high-pressure lines in particular such closing body and valve seats with conical seats are. Compared with other types of seats, both the sealing effect and the load capacity are good. It also occurs on a self-centering of closing body and valve seat.
    The sleeve-shaped housing with the closing body and the valve spring are usually configured as a plug-in or plug-in part. In a further advantageous embodiment, therefore, a separate housing cover for closing and sealing of the sleeve-shaped housing may be provided, which is inserted and fixed in the base body and by means of a, preferably elastic, compensation device (eg, a spring bias applying compensation device) on a front side of the sleeve-shaped Housing presses. The housing is thus constructed at least in two parts, wherein the attachment of the housing cover is not directly on the sleeve-shaped housing, but on the base body. As a result, by means of the housing cover, a spring preload on the sleeve-shaped
    Apply housing, whereby this example. in a sealing seat, preferably also a conical seat, is pressed. Also, the housing cover should preferably seal to the base body with a sealing seat. Between the housing cover and the sleeve-shaped housing, e.g. a diaphragm spring, a corrugated spring, or another body are placed, which deforms elastically under pressure. This ensures that both the sleeve-shaped housing and the housing cover are in contact with the base body and seal. A conical seat can also be used for the housing cover. But it is also possible to postpone or plug a seal on the housing cover. This also prevents a multiple fit, since the housing cover in the axial direction does not need to be positioned exactly. The seal, with e.g. a sealing ring, even some axial play, e.g. a groove.
    In addition, the base body may have a guide section for guiding one of the guide surfaces of the closing body, preferably a guide surface on the actuating tappet. Usually, then, the leadership of the closing body takes place both within the sleeve-shaped housing and outside of the sleeve-shaped housing in the base body on the low pressure side. The guide surfaces then have the desired distance from each other for a tip-safe guidance of the closing body. In addition, the engagement of a separate actuating element as part of the actuating device in the low-pressure region and the existing there guide surface can be arranged at a small distance to the point of initiation of the actuating force in the actuating plunger.
    In a further variant, it is provided that the guide surfaces on the closing body have regions which are arranged at a distance from the associated guide sections in the sleeve-shaped housing and / or in the base body such that, with the drain valve open, an axial flow along the hydraulic fluid at the closing body in the form of at least one Bypass channel is enabled. For example, the closing body may have flats, wherein these flattened areas are not in contact with the housing and thus formed between this bypass channel. But it is also possible, a part of the closing body, e.g. likewise to be guided in the housing on the actuating tappet, this can then likewise be flattened or longitudinal grooves can be introduced into the housing in this area, through which the hydraulic fluid can flow. These could be e.g. by making rooms.
    In a variant, it can be provided that the housing cover has a guide section for guiding one of the guide surfaces of the closing body. The guide then takes place upstream of the valve seat. This variant has the advantage that the hydraulic fluid on the low pressure side could flow around the end of the closing body through a large bore, since no further guidance has to be provided here. However, the tolerance chain is very long. The housing cover should also be sufficiently centered in the base body in such a configuration.
    When using a guide surface on the actuating tappet must be ensured that the hydraulic fluid can flow. This can e.g. by longitudinal grooves or by an eccentrically positioned bore, which creates a connection to the oil drain passage done.
    An attachment of the valve spring can be carried out well in particular if, according to a variant of the confirmation plunger has an actuating head on which the support surface is arranged for the valve spring. When mounting, e.g. the closing body inserted through the housing and then the valve spring, in particular a conical valve spring, pushed over the end of the closing body until it rests behind the actuating head on the support surface. The outermost spring coils are slightly bent. The valve spring and the actuator head should be dimensioned so that the deformation of the valve spring takes place in the elastic range. Should this design be so impractical, there would be several alternative mounting options that would be compatible with the basic concept of the drain valve. It would be possible, e.g. a split closure body in which e.g. the actuator head is subsequently connected to the actuating tappet (glued, pressed, screwed, etc.). As an operating head to use a locking ring is also possible. The actuator head may also have a spiral groove on the outer periphery for attachment of the lower end of the valve spring. The valve spring of the dump valve could also be designed as a truncated cone spring having a rectangular cross section (e.g., sheet metal wound).
    The invention relates to an insert for a drain valve according to one of claims 1 to 13 with a sleeve-shaped, a valve seat-forming housing for insertion into an opening in the base body and a displaceably guided in the housing and by means of a valve spring with this captive coupled closing body, and a on the outer circumference or in the wall of the sleeve-shaped housing shaped throttle device for forming a valve seat upstream upstream upstream throttling point in the base body arranged use. This insert is therefore pre-assembled as a bowl component of the drain valve allowing for prior component testing as well as mounting in the base body, e.g. the lower rod part of a VCR connecting rod. This insert is inserted into the base body and optionally replaced by another element, e.g. Housing cover, fixed and sealed.
    Moreover, the invention relates to a VCR connecting rod for an internal combustion engine with a hydraulic drive circuit comprising at least one drain valve according to one of claims 1 to 13. A VCR connecting rod is exposed to high loads and high pulsating pressures of over 300 bar occur in a hydraulic control circuit. All components must be designed to be durable. The demands on a drain valve used for this purpose are high.
    The high pressure has a swelling effect on the drain valve and its closing body. Preferably, the closing body should be opened with little force in the low-pressure phases. As part of the confirmation device, e.g. an actuator may be used, which may include a cam disc disposed below the bleed valve which raises the closure body and thus opens the conduit. When repressurized, the drain valve is open. The hydraulic fluid flows off. The pressure drops mainly before the closing body. Due to the throttling, the holding force for the closing body is very low. But it is also possible the design of an actuating element, so that no holding power is required. For example, in the case of a rotated cam, which has an area which is cylindrical and whose axis coincides with the axis of rotation of the cam, this is the case (no change in stroke when turning). However, there are other forms of design as well.
    There are applications where high accelerations act on the drain valve. In order to prevent the closing body tipping in his seat, it is therefore advantageous to place the center of gravity of the closing body in the region of the valve seat. Favorable here is e.g. the variant with the guide in the housing cover. This solution automatically results in more mass on the high pressure side, which at least partially offsets the mass of the actuating pin. A corresponding shape of the closing bodies could also be used if e.g. For technical reasons, no guidance at the top is possible.
    The closing bodies could consist of metallic or ceramic materials. The mass of the closing body should be as low as possible in order to reduce the acceleration forces. In addition, the material must have a high wear resistance (hardness) and a high strength.
    In addition, the actuating device can be designed such that it acts on several similar discharge valves simultaneously and thus enables the function of a control valve.
    In the following, embodiments of the present invention will be explained in more detail with reference to drawings. Show it:
    1 shows a first embodiment of a discharge valve according to the invention in full section,
    2 shows a second embodiment of a discharge valve according to the invention in full section,
    3 shows a third embodiment of a discharge valve according to the invention in full section,
    4 shows a fourth embodiment of a discharge valve according to the invention in a perspective full section,
    5 shows the drain valve of FIG. 4 in an external perspective view,
    6 is an enlarged view of the sleeve-shaped housing of FIGS. 4 and 5 in an enlarged perspective plan view,
    7 shows a variant of a closing body in an enlarged perspective view,
    Fig. 8 shows a further embodiment of an insert according to the invention in full section and
    Fig. 9 shows a further embodiment of an insert according to the invention in full section.
    The first embodiment of a drain valve 1 shown in FIG. 1 is used as part of a hydraulic drive circuit of a VCR connecting rod whose center distance between the small and the large connecting rod eye is variable. By means of the drain valve 1, a pressure chamber of the hydraulic drive circuit can be hydraulically closed or opened. The VCR connecting rod is thus locked in a desired length position or released for transfer to another length position. The VCR connecting rod of an internal combustion engine is alternately loaded with tension and pressure during operation. Accordingly, swelling pressures of more than 300 bar (in the closed state of the drain valve 1) arise in the high pressure region of the hydraulic control circuit. In the present case, the drain valve 1 is integrated in the lower part of the VCR connecting rod which is connected to the crankshaft and thus applies as the base body 2 for the drain valve 1. The drain valve 1 comprises a sleeve-shaped housing 3, a closing body 4 displaceably guided therein, a conically shaped valve spring 6, a housing cover 5 designed as a closure plug and a spring element 16 designed as a plate spring between the housing cover 5 and the sleeve-shaped housing 3. Located in the base body 2 a supply line 7 assigned to the high-pressure region is supplied to the sleeve-shaped housing 3 through the hydraulic fluid, in particular engine oil.
    The closing body 4 is provided with a closing cone 8, which presses precisely in the closed state on the likewise conically shaped valve seat 9. Above the closing cone 8 is a cylindrical guide surface 10, with which the closing body 4 is guided in a corresponding guide portion 10 a of the sleeve-shaped housing 3. Below the closing cone 8, an actuating plunger 11 is arranged on the closing body 4, which extends to form an annular gap through the valve opening 13 of the sleeve-shaped housing 3 and protrudes down from this. The actuating tappet 11 is provided with an actuating head 14 at its free end. The actuating head 14 forms a support surface 15 for the lower end of the valve spring 6. At the free end of the actuating head 14 is provided with a cam surface 17. The upper, larger diameter, end of the valve spring 6 is received in a bore step 18 at the lower end side of the sleeve-shaped housing 3. Above the closing cone 8 and the cylindrical guide surface 10 is a cylindrical pin projection 19, which is guided in a corresponding receiving bore 20 in the lower end face of the housing cover 5. The peripheral surface of the pin projection 19 thus forms a second guide surface 21 of the closing body 4, which is arranged at a distance from the guide surface 10 and is smaller in diameter. The closing body 4 is pressed into its closed position shown in Fig. 1 due to the spring force of the valve spring 6.
    The closing body 4 is moved axially by means of an actuating device 22 (for example a cam mechanism acting on the cam surface 17 of the actuating head 14), in particular in its open position. The actuating device 22, whose component is also the actuating tappet 11 and the valve spring 6, can be configured in many ways. It would be conceivable, e.g. a cam, which raises the closing body 4. It is also possible a design, so that no holding power is required. This is the case, for example, with a rotated cam having an area which is cylindrical and whose axis coincides with the axis of rotation of the cam (no change in stroke during rotation). A hydraulically actuated slide with cam is conceivable.
    The sleeve-shaped housing 3 has on its front end face a sealing cone 23 which is arranged on a complementary sealing surface at the end of a receiving bore 24 for the sleeve-shaped housing 3. The receiving bore 24 is formed in the base body 2.
    The housing cover 5 has a threaded portion 25 with which it is screwed into the base body 2. At the upper end of the housing cover 5 is a sealing cone 26 which is pressed into a complementary conical sealing surface 27 in the base body 2. At the upper end is located on the housing cover 5, a centering surface 28 so that an exact alignment of the receiving bore 20 and guide the pin attachment 19 is made possible. The housing cover 5 has a suitable tool holder 29 to perform the screwing with a predetermined tightening torque. For tolerance compensation and for secure pressing and thus sealing of the sleeve-shaped housing 3, said spring element 16 in the form of a plate spring is interposed between the front end face of the housing cover 5 and the upper end face of the sleeve-shaped housing 3. As a result, the necessary contact pressure of the housing 3 with the sealing cone 23 is ensured against the base body 2.
    This is in the present case formed by a precision opening in the side wall of the sleeve-shaped housing 3, which opens in the closed state of the closing body 4 on the cylindrical guide surface 10 and is closed by the latter. Thus, the sleeve-shaped housing 3 can be installed undirected, an annular groove 31 is incorporated in the receiving bore 24 at the level of the supply line 7. Alternatively, this could also be present on the outside of the sleeve-shaped housing 3, but which would increase its diameter. The pressure drop across the throttle point 30 is such that it is at least three times greater than the pressure drop in the region of the valve seat 9 and the valve opening 13 in the open state. Both the valve spring 6 and the actuator 22 are thus located on the low pressure side of the drain valve 1. The valve port 13 is connected via a bore portion 32 with the drain line 33 in fluid communication. The actuating device 22 is designed such that this flow connection is given with the drain valve 1 open. The drain valve 1 described is exposed to a very high pressure during operation with locked supply line 7 and must ensure a high tightness, which is preferably done by the closing cone 8 and the correspondingly shaped valve seat 9 and the sealing cone 23. The selected construction of the drain valve 1 and the use of a plunger-driven, provided with a valve spring, actuator on the low pressure side, opens up the possibility to produce a highly loaded component that gets along with the least possible weakening in the base body 2, since the dimensions of all components are minimized , This arrangement also allows the installation of the drain valve 1 in such a way that the function is not affected by accelerations occurring in the VCR connecting rod. Thus, the axis of the closing body 4 can be arranged parallel to the crankshaft axis.
    Due to the design and the specially shaped sealing surfaces, it is also possible to keep the leakage in the closed state as low as possible, whereby a very good blocking of the length position of the VCR connecting rod is possible. In addition, the key components of the drain valve 1 can be made pre-assembled. These are the sleeve-shaped housing 3, the closing body 4 and the valve spring 6. The valve spring 6 fixes the closing body 4 on the housing 3 or captively couples it with the latter. As a result, a prior component testing is possible and facilitates installation in the base body 2. Due to the choke point 30 used, the pressure drops mainly when the drain valve 4 is open when the drain valve 1 is open. The closing body 4 thus experiences a relatively low pressure load and also the holding force to keep it in the open position is therefore low.
    A special feature of a VCR connecting rod is that very high pressure differences, which act swelling on the drain valve 1, to be reduced. For this purpose, the throttle body 30, which is automatically formed during installation of the sleeve-shaped housing 3 or is formed. Due to the swelling pressure, the actuator 22 may be formed so that a force is sufficient, which opens the drain valve 1 in the lower pressure phases. If the drain valve 1 is open, only a small part of the pressure on the closing body 4 or in the valve seat 9 falls off. The majority of the effective pressure difference drops off at the upstream throttle point 30. This is achieved by a suitably selected aspect ratio.
    The embodiment selected in FIG. 1 also serves for applications when high accelerations act on the drain valve 1. In order to prevent the closing body 4 tipping in his seat, due to the pin projection 19, a counterweight to the actuating plunger 11 with actuating head 14 results because the center of gravity of the closing body 4 falls in the region of the valve seat 9. The chosen solution automatically leads to more mass on the high pressure side, even if a guide in the range on the low pressure side is not possible, this variant is appropriate.
    The closing body 4 could consist of metallic or ceramic materials. The mass of the closing body 4 should be as low as possible in order to reduce the acceleration forces. In addition, the material must have a high wear resistance (hardness) and a high strength.
    The valve spring 6 is dimensioned so that it can be pushed over the actuating head 14 on the actuating plunger. The narrower spring turns are bent slightly. The valve spring 6 and the actuating head 14 are dimensioned so that the deformation of the Endwindungen takes place in the elastic region.
    The spring element 16 used automatically leads to a tolerance compensation, but nevertheless to carry out a very well sealed solution.
    The closing body 4 is supported by the actuating head 14 in the open position on a surface of an actuating element of the actuating device 22. Advantageously, the embodiment can be made so that no holding force must be exerted in the open state by means of the actuating element, but this automatically remains in the assumed switching position. In the usual VCR connecting rod usually two of these drain valves 1 are in use. The actuating device 22 can be configured such that its actuating element acts simultaneously on these two drain valves 1 or also on a plurality of drain valves and thus has the function of a directional control valve.
    In the following, a further embodiment of a drain valve 1 according to the invention will be explained in more detail with reference to FIG. It will be discussed in the following only to the essential differences from the previous embodiment, which is why reference is made by using the same reference numerals to the above structural and functional description.
    In the version shown in Fig. 2, the orifice 30 is replaced by a diameter jump, i. a throttle gap between the base body 2 and the lateral surface of the sleeve-shaped housing 3 is formed. In order for the hydraulic fluid to flow from this throttle gap into the sleeve-shaped housing 3, openings (not shown, for example grooves) must be provided on the upper end face of the sleeve-shaped housing 3 so that the hydraulic fluid flows into the sleeve-shaped housing 3 from above. In addition, a longitudinal groove 34 is provided so that the hydraulic fluid can flow past the cylindrical guide surface 10 of the closing body 4.
    Another difference is that the closing body 4 has no pin boss 19, but the actuating head 14 on its lateral surface, the second guide surface 35 has. The actuating head 14 is therefore guided in a correspondingly shaped bore section 36 in the base body 2. But even here, a corresponding longitudinal groove 37 must be provided so that the hydraulic fluid flows into the low-pressure region and the drain line 33. As an actuating element of the actuating device 22 again diverse embodiments can be used, which can move the actuating plunger 11 axially.
    Due to the lack of pin attachment of the housing cover 5 requires no receiving bore 20. The tolerance chain for guiding the closing body 4 is smaller and the distance between the two guide surfaces 10 and 35 is slightly larger, which can have advantages.
    A further embodiment of a drain valve 1 according to the invention will now be explained in more detail with reference to FIG. It will be discussed in the following only on the differences from the preceding embodiments, so reference is made by using the same reference numerals in addition to the previous description in terms of structural design and function.
    The main difference consists solely in the type of sealing on the housing cover 5 and the absence of a spring element between the housing cover 5 and the sleeve-shaped housing 3. The function of the spring element 16 takes over in this embodiment, the sealing ring 16a. This serves as a tolerance compensation and seals the drain valve 1 to the outside with screwed housing cover 5 from. In addition, the centering of the housing cover 5 over a larger portion is possible because a larger sealing cone 26 on the housing cover 5 is not used, but a straight sealing surface 38 presses on the sealing ring 16a. However, an exact axial positioning is not mandatory. The sealing ring 16a could even be arranged with some play. Due to the unilaterally acting pressure, the sealing ring 16a will move upwards during operation and bear against the sealing surface 38 of the housing cover 5 as well as on the lateral surface of the bore in the base body 2.
    When using a bore as a throttle point 30, a seal could also be made between sleeve-shaped housing 3 and the base body 2. However, the sealing solution on the housing cover 5 appears more practical.
    A further embodiment of a drain valve 1 according to the invention will now be explained in more detail with reference to FIGS. 4 to 6. In the figures, the representation of the base body 2 has been omitted. However, the embodiment is very similar to the embodiment according to FIG. 1, which is why in the following only the essential differences should be discussed and reference is additionally made to the above description. The main difference is that the actuating tappet 11 is guided in the sleeve-shaped housing 3. However, the guide takes place only at some points by means of webs 39, so that drain grooves 40 are formed between the webs. The section shown in Fig. 4 is exactly guided by two diametrically opposed webs 39. From Fig. 6 it can also be seen that the drain grooves 40 intersect only slightly with the conical valve seat 9.
    Another difference is that instead of a pronounced actuating head, a groove 41 is arranged in the actuating plunger 11, in which a securing ring 42 is arranged, whose upper side forms the support surface 15 for the valve spring 6. Due to this configuration, it is not necessary to elastically deform the valve spring 6 when mounting the insert 43 consisting of the sleeve-shaped housing 3, the closing body 4 and the valve spring 6 and the securing ring 42. As a result, other valve springs 6 are used. For example, the valve spring could also be designed as a truncated cone spring with a rectangular cross-section.
    An alternative closing body 4 will now be described in more detail with reference to FIG. This has both in the region of its cylindrical guide surface 10 and in the region of the guide surface 35 flats 44 and 45, so that hydraulic fluid can flow past the closing body 4 in the open state. The closing body 4 can of course be designed with a longer actuating plunger 11 for receiving the valve spring and in the previous embodiments.
    Alternatively, now with reference to FIG. 8, a further embodiment, in particular of the closing body 4 is explained in more detail. In this embodiment, the closing body 4 is executed divided. The actuating head 14 is subsequently connected to the actuating tappet 11, e.g. by gluing, pressing or screwing or welding. This also makes it easy to assemble the valve spring 6 and then put on the actuator head 14 and connect to the rest of the closing body 4.
    According to the embodiment of Fig. 9, a further variant for the design of the closing body 4 and the attachment of the valve spring 6 is explained in more detail. The outside of the actuating head 14 has a spiral groove 46, over which the valve spring 6 is threaded, wherein the lower turns are anchored therein.
    1 drain valve 2 base body 3 sleeve-shaped housing 4 closing body 5 housing cover 6 valve spring 7 supply line 8 closing cone 9 valve seat 10 cylindrical guide surface 10a guide portion 11 actuation plunger 12 annular gap 13 valve opening 14 actuating head 15 support surface 16 spring element 16a sealing ring 17 cam surface 18 bore level 19 pin boss 20 receiving bore 21 cylindrical Guide surface 22 Actuator 23 Sealing cone 24 receiving bore 25 threaded portion 26 sealing cone 27 conical sealing surface 28 centering 29 Tool holder 30 restrictor 31 annular groove 32 bore portion 33 drain line 34 longitudinal groove 35 guide surface 36 bore section 37 longitudinal groove 38 sealing surface 39 web 40 drain groove 41 groove 42 retaining ring 43 insert 44 flattening 45 flattening 46 spiral groove
    权利要求:
    Claims (15)
    [1]
    claims
    A discharge valve (1) for discharging a hydraulic fluid from a high-pressure region into a low-pressure region, in particular for a hydraulic drive circuit of a VCR connecting rod, comprising a base body (2), a sleeve-shaped housing (3) with valve seat inserted into the base body (2) (9), a closing body (4) displaceably guided in the housing (3), a valve spring (6) biasing the closing body (4) against the valve seat (9), a throttle point (30) upstream upstream of the valve seat (9) and a valve body (9) Characterized in that the throttle point (30) upstream of the closing body (4) is arranged upstream such that the throttle point (30) in the transition region of the base body (2) and the sleeve-shaped housing (3) and / or in the wall of the sleeve-shaped housing (3) is formed, u nd the valve spring (6) is arranged as part of the actuating device (22) on the low pressure side downstream of the valve seat (9).
    [2]
    2. drain valve (1) according to claim 1, characterized in that the valve spring (6) captively couples the closing body (4) with the sleeve-shaped housing (3).
    [3]
    3. drain valve (1) according to claim 1 or 2, characterized in that on the low pressure side on the closing body (4) as part of the actuating device (22) an actuating plunger (11) with a closing body (4) spaced support surface (15) is provided and the valve spring (6) is arranged between a low-pressure side of the sleeve-shaped housing (3) and the support surface (15).
    [4]
    4. drain valve (1) according to one of claims 1 to 3, characterized in that the throttle point (30) is designed such that the self-adjusting pressure difference at the throttle point (30) is at least three times greater than the self-adjusting pressure difference between the open closing body (4) and valve seat (9) and associated valve opening (13).
    [5]
    5. drain valve (1) according to one of claims 1 to 4, characterized in that the throttle point (30) is formed by an annular gap between the sleeve-shaped housing (3) and the base body (2).
    [6]
    6. drain valve (1) according to one of claims 1 to 4, characterized in that the throttle point (30) of at least one opening, in particular precision bore, in the wall of the sleeve-shaped housing (3) is formed.
    [7]
    7. drain valve (1) according to one of claims 1 to 6, characterized in that the closing body (4) is guided on at least two axially spaced guide surfaces (35).
    [8]
    8. drain valve (1) according to one of claims 1 to 7, characterized in that the closing body (4) has a conical closing surface (8) and the valve seat (9) has a corresponding conical shape.
    [9]
    9. drain valve (1) according to one of claims 1 to 8, characterized in that a separate housing cover (5) for closing and sealing of the sleeve-shaped housing (3) is provided, which is inserted and fixed in the base body (2) and by means of one, preferably elastic, balancing device presses on an end face of the sleeve-shaped housing (3).
    [10]
    10. drain valve (1) according to one of claims 7 to 9, characterized in that the housing cover (5) has a guide portion for guiding one of the guide surfaces (35) of the closing body (4).
    [11]
    11. drain valve (1) according to one of claims 7 to 10, characterized in that the base body (2) has a guide portion for guiding one of the guide surfaces (25) of the closing body (4), preferably a guide surface of the actuating plunger (11).
    [12]
    12. drain valve (1) according to one of claims 7 to 11, characterized in that the guide surfaces on the closing body (4) have regions which at a distance from the associated guide sections in the sleeve-shaped housing (3) and / or in the base body (2) are arranged so that when the drain valve (1) is open, an axial flow along the hydraulic fluid at the closing body (4) in the form of at least one bypass channel is made possible.
    [13]
    13. drain valve (1) according to one of claims 3 to 12, characterized in that the actuating plunger (11) has an actuating head (14) on which the support surface (15) for the valve spring (6) is arranged.
    [14]
    14. insert (43) for a drain valve (1) according to one of claims 1 to 13, with a sleeve-shaped, a valve seat (9) forming housing (3) for insertion into an opening in the base body (2) and in the housing (3 ) displaceably guided and by means of a valve spring (6) with this captively coupled closing body (4) and a, on the outer circumference or in the wall of the sleeve-shaped housing (3) shaped throttle device for at least forming a valve seat (9) upstream upstream throttle body (30) at in the base body (2) arranged insert (43).
    [15]
    15. VCR connecting rod for an internal combustion engine with a hydraulic drive circuit comprising at least one drain valve (1) according to one of claims 1 to 13.
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    同族专利:
    公开号 | 公开日
    DE102017110380A1|2018-11-15|
    AT519932A3|2019-03-15|
    AT519932B1|2020-09-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    AT521160B1|2018-10-08|2019-11-15|Avl List Gmbh|Length adjustable connecting rod with mass-reduced drain valve|
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    AT521606A4|2018-10-08|2020-03-15|Avl List Gmbh|Hydraulic valve mechanism for adjustable connecting rod|GB2049882B|1979-04-27|1983-02-02|Ass Builders Merchants|Valve|
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    EP3085921B1|2015-04-21|2019-12-25|Hilite Germany GmbH|Connecting rod with switching valve|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102017110380.5A|DE102017110380A1|2017-05-12|2017-05-12|Drain valve for high pressures|
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