• 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:
    Modular electric traction system. Bridge assembly (40) for a heavy vehicle comprising a crosspiece (41) rigidly connecting at least one pair of wheels (102, 103) to each other, and an electric drive module (1), movably carried by the transverse part (41) and comprising at least one electric motor (2), a first and a second output shaft (16, 17) and a transmission (3) configured to connect the at least one electric motor (2) with at least one between the first and the second output shaft (16, 17), the electric traction module (1) further comprising a casing (8) configured to define a volume (9) within which the electric motor is housed (2) and the transmission (3) and at least part of the first and second output shaft (16, 17). (Machine-translation by Google Translate, not legally binding)
    公开号:ES2772623A2
    申请号:ES201931112
    申请日:2019-12-16
    公开日:2020-07-07
    发明作者:Giorgio Rossia；Alessandro Mantovan
    申请人:FPT Industrial SpA；
    IPC主号:
    专利说明:

    [0001] MODULAR ELECTRIC TRACTION SYSTEM
    [0003] Cross reference to associated patent applications
    [0004] The present application claims the priority of the Italian Patent Application No. 102018000021025 filed on December 24, 2018, the content of which is incorporated herein by reference.
    [0005] Technical field
    [0006] The present invention relates to a traction system for commercial vehicles and in particular to an electric and modular traction system for commercial vehicles.
    [0007] Known state of the art
    [0008] The use in commercial vehicles of traction systems powered by internal combustion engines is known, normally connected to a rigid rear axle, that is to say to a transverse load-bearing piece, the axle, which rigidly connects the two wheels and contains the two traction axle shafts. of the wheels connected to each other by a differential. This rigid bridge is connected to the vehicle frame by means of the suspensions, as schematically illustrated in figure 1.
    [0009] In said figure 1 the rigid bridge 1 'of a vehicle 10' essentially comprises a bridge 2 'that connects the right wheel and the left wheel 3', 4 'at their respective ends and carries the differential 5' in a known way, in the center of the bridge 2 '. The bridge 2 'is connected to a frame 6' of the vehicle 10 'by means of the respective suspensions 7', 8 'of any type.
    [0010] A 1 'rigid bridge structure of the type shown in figure 1 allows heavy loads to be transported reliably and to maintain the wheel's travel geometry in a controlled manner, reducing their wear.
    [0011] However, the rigid bridge 1 'needs to be reconfigured every time the magnitude in the bridge and the powers involved change and therefore the structure of the bridge 2' and the differential 5 'must be reconfigured. This need is even more apparent in the electric / hybrid traction sector where it is necessary to provide a location for the electric traction motor, the size of which varies depending on the torque supplied.
    [0012] Consequently, there is a need for a traction system that is as versatile as possible and that can be used in different vehicles with different types of bridge, suspension and weight transported.
    [0013] In other words, there is a need for a system that can satisfy the capacity of the transmission components regardless of their power.
    [0014] The aim of the present invention is to satisfy these needs.
    [0015] Summary of the invention
    [0016] Said objective is achieved with a bridge assembly provided with a modular electric traction system as shown in the appended claims.
    [0017] Brief description of the drawings
    [0018] For a better understanding of the present invention, a preferred embodiment is described below, merely by way of non-limiting example and with reference to the attached drawings, in which:
    [0019] figure 1 illustrates a schematic rear view of a rigid bridge traction system according to the known art;
    [0020] figure 2 illustrates a first embodiment of a modular electric traction system;
    [0021] figure 3 illustrates a second embodiment of a modular traction system;
    [0022] figure 4 illustrates a rigid axle traction system comprising a modular traction system according to figures 2 and 3;
    [0023] figure 5 illustrates a rigid bridge traction system comprising a modular traction system according to figures 2 and 3; and
    [0024] figure 6 illustrates a traction system with independent suspension on the wheels comprising a modular electric traction system according to figures 2 and 3;
    [0025] Detailed description of the invention
    [0026] Figures 2 and 3 schematically illustrate an electrical traction module 1. This electrical traction module 1 essentially comprises at least one electric motor 2 and a mechanical transmission system 3 configured to carry the mechanical torque supplied by at least one electric motor 2 to a pair of axle shafts 4, 5 of a vehicle 10 each configured to carry a wheel at one end, for example the rear wheels of a commercial vehicle, as described below.
    [0027] Advantageously, at least one electric motor 2 and the mechanical transmission system 3 are both housed inside a casing 8 configured to delimit an interior volume 9 suitable for this purpose.
    [0028] In the first embodiment, figure 2, the electric traction module 1 comprises a single electric motor 2a housed within the defined interior volume 9 by the casing 8 connected through the mechanical transmission system 3 to a left half shaft and even a right half shaft 5, configured to carry respective wheels as previously indicated.
    [0029] The electric motor 2a is dimensioned to be able to provide a torque that makes it possible to move a 3.5-ton vehicle, therefore it is capable of providing a power P preferably between 80 kW and 150 kW, in order to provide approximately 500 Nm of torque to wheels (total of the two drive wheels).
    [0030] The transmission system 3, in the case described, comprises a first gear wheel 11 carried by an output shaft of the electric motor 2a and coupled with a second gear wheel 12 carried by an intermediate shaft 13. The intermediate shaft 13 also carries a second toothed wheel 14 meshing with a differential 15, of known type.
    [0031] Differential 15, as is known, consists of a pair of output shafts 16, 17 each connected to the respective half shafts 4, 5 through a respective constant velocity joint 18, 19, for example a universal joint.
    [0032] In the second embodiment, figure 3, the electric traction module 1 comprises a pair of electric motors 2a, 2b each housed within a respective inner volume 9a, 9b defined by housings 8a, 8b. The housings 8a, 8b are advantageously connected to one another in a solid manner.
    [0033] The electric motors 2a, 2b are dimensioned to provide, together, a sufficient torque to move a 7-ton vehicle, therefore each of them is capable of providing a power P substantially similar to that of the module of figure 1.
    [0034] Therefore, overall the module of figure 2 can provide a power of 2P, that is to say preferably between 160 kW and 300 kW; which corresponds to about 10,000 Nm of torque at the wheels. More preferably the module 1 of figure 3 can also include reducers with epicyclic wheels located at the output on the semi-shafts, or on the wheels, to further increase the reduction ratio, up to a maximum of 2-3 times, For example it is It is possible to obtain torques in the wheels of a value greater than 10,000 Nm, for example for heavy vehicles up to 18 tons it is possible to obtain supplied torques of the order of 30,000 total Nm.
    [0035] Therefore it is possible to provide electric traction modules 1 in which the electric motor 2 and the transmission 3 are configured to provide a power N times P where P is the power of a base module and N is an integer. between 1 and 5.
    [0036] In the example described the mechanical transmission system 3 is a separate system for each semi-shaft 4, 5 and comprises a first gear system 20a and a second gear system 20b respectively configured to connect the first electric motor and the second 2a, 2b with the semi-axis 4, 5.
    [0037] In particular, the first gear system 20a may include a first gear 21a carried by an output shaft of the electric motor 2a and coupled with a second gear 22a carried by an intermediate shaft 23a. The intermediate shaft 23a also carries a second sprocket 24a coupled with a sprocket 25a carried by an output shaft 16 connected to the left half shaft 4 by means of a respective constant velocity joint 18, for example a universal joint cardan.
    [0038] In a preferably mirror-like manner, the second gear system 20b may include a first gear 21b carried by an output shaft of the electric motor 2b and coupled with a second gear 22b carried by an intermediate shaft 23b. The intermediate shaft 23b also carries a second sprocket 24b coupled with a sprocket 25b carried by an output shaft 17 connected to the left half shaft 5 by means of a respective constant velocity joint 19, for example a universal joint cardan.
    [0039] The electric traction module 1 can advantageously be associated with a rear suspension system of a vehicle as described below.
    [0040] Referring to Figure 4, a vehicle 100 equipped with a suspended frame 101 is illustrated, as described below, with respect to a rigid bridge assembly 30 according to a first embodiment of said system.
    [0041] The rigid bridge assembly 30 comprises a cross piece 31, substantially a rigid bar, which rigidly connects a pair of wheels 102 together.
    [0042] 103 of the vehicle 100. Said cross piece 31 is also connected to the frame 101 of the vehicle in a movable manner, advantageously by means of elastic damping devices 104, of known type, such as for example leaf springs or a multi-link system and coil springs.
    [0043] The electric traction module 1 is carried by the frame 101, advantageously integral with the latter, and the half shafts 4, 5 are connected to the wheels 102, 103 in a known way.
    [0044] Referring to Figure 5, a vehicle 100 equipped with a suspended frame 101 is illustrated, as described below, with respect to a rigid bridge assembly 40 according to a second embodiment of said system.
    [0045] The rigid bridge assembly 40 comprises a cross piece 41 that rigidly connects a pair of wheels 102, 103 of the vehicle 100 to each other. Said cross piece 41 is also connected to the frame 101 of the vehicle in a movable manner, advantageously by means of elastic damping devices. 104, of a known type, such as for example leaf springs or a multi-link system and coil springs.
    [0046] The cross piece 41 also defines a structure resistant to the loads that the frame 101 transmits to the latter, while preventing them from being transmitted to the module 1. In the example described, the intermediate cross piece defines a space 42, axially delimited by the two upper and lower parts 41a, 41b of the cross piece 41 and laterally at the end parts and connecting with the wheels 102, 103.
    [0047] The electrical traction module 1 is advantageously carried by the cross piece 41 inside the inner volume 42, preferably movably.
    [0048] Advantageously, the movable connection between the casing 8 and the electrical traction module 1 and the cross piece 41 comprises at least elastic damping devices 43 that movably connect the casing 8 at least vertically to the parts 41a, 41b.
    [0049] Referring to Figure 6, a vehicle 100 is illustrated equipped with a frame 101 suspended from its wheels 102, 103 as described below by means of an independent suspension system 50.
    [0050] The independent suspension system 50 consists of a suspension of known type 51, 52 for each wheel 102, 103 configured to connect the latter to the frame 101 of the vehicle 100. These suspensions 51, 52 can each comprise for example a plurality of arms 53 and elastic damping devices 54 connecting the respective wheel 102, 103 to a housing part 55 that carries the frame, preferably integrally.
    [0051] The electrical traction module 1 is advantageously carried by the housing part 55, ideally being integrally. The housing part 55 preferably comprises a flange that extends from the frame 101 towards the ground.
    [0052] From everything discussed so far, the advantages of the electric traction module 1 and the bridge assembly described above are evident.
    [0053] The electric traction module 1 can be used in a modular way in a variety of vehicles equipped with suspensions of different types, independent or rigid bridge.
    [0054] In particular, the electric traction module 1 can be dimensioned for different types of vehicle / tonnage by varying the number of associated electric motors and / or the type of transmission.
    [0055] The electric traction module 1 can be carried by the axis itself, thus freeing the frame 1 from limitations, which can be used on different types of axles.
    [0056] As already mentioned above, the electric traction module 1 can be used in different types of suspension, rigid bridge, or in independent suspensions, favoring economies of scale.
    [0057] Finally, it is evident that modifications and variants can be made to the electric traction module 1 and to the bridge assembly made according to the present invention, which, however, are not outside the scope of protection defined by the claims.
    [0058] As mentioned, the number of electric motors and the type of transmission may vary depending on the power to be supplied by the electric traction module 1.
    [0059] And furthermore, various types of suspension can use the electric traction module 1. For example, the rigid part 41 can define different spaces or shapes to carry the electric traction module 1, different from the space 42 described as an example in the present application.
    权利要求:
    Claims (7)
    [1]
    1. - Bridge assembly (40) for a heavy vehicle, said bridge assembly (40) comprising a crosspiece (41) that rigidly connects at least one pair of wheels (102, 103) comprising said bridge assembly ( 40) an electric traction module (1), carried movably by said transverse piece (41), said traction module comprising at least one electric motor (2), a first and a second output shaft (16, 17) and a transmission (3) configured to connect said at least one electric motor (2) with at least one of said first and second output shafts (16, 17), said electric traction module (1) further comprising a housing (8 ) configured to define a volume (9) inside which said electric motor (2) and said transmission (3) and at least part of said first and second output shafts (16, 17) are housed.
    [2]
    2. - Set according to claim 1, further comprising a first and a second semi-shaft (4, 5), said first semi-shaft (4) being connected to said first output shaft (16) by means of a first constant velocity joint (18) and said second semi-shaft (5) being connected to said second output shaft (17) by means of a first constant velocity joint (19).
    [3]
    3. - Set according to claims 1 or 2, in which said module comprises a single electric motor (2a) and in which said transmission (3) comprises a differential (15) connected to both said first and second output shafts ( 16, 17).
    [4]
    4. - Set according to claims 1 or 2, wherein said module comprises a first electric motor (2a) and a second electric motor (2b), said transmission (3) comprises a first gear system (20a) connecting said first electric motor (2a) to said first output shaft (16) and a second gear system (20b) connecting said second electric motor (2b) to said second output shaft (17).
    [5]
    5. - Set according to one of the preceding claims, wherein said transmission (3) comprises epicyclic gears.
    [6]
    6. - Set according to one of the preceding claims, wherein said to minus one electric motor has a base power P between 80 and 150 kW.
    [7]
    7. Traction module according to claim 6, in which said at least one electric motor (2) and said transmission (3) are dimensioned to offer a module with a power of N times the base power P, where N is a pre-established integer number between 2 and 5.
    Vehicle (100) comprising a rigid bridge assembly (40) according to any one of the preceding claims.
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    同族专利:
    公开号 | 公开日
    DE102019134454A1|2020-06-25|
    IT201800021025A1|2020-06-24|
    ES2772623R1|2021-03-29|
    FR3090548A1|2020-06-26|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE665984C|1938-10-08|Ettore Bugatti|Drive for motor vehicles|
    US7824293B2|2007-09-28|2010-11-02|Oshkosh Corporation|Vehicle transmission|
    EP2847496B1|2012-07-09|2021-06-16|Eaton Intelligent Power Limited|Drive system|
    EP3390128A4|2015-12-17|2019-09-18|Allison Transmission, Inc.|Axle assembly for a vehicle|
    US10207751B2|2016-05-09|2019-02-19|Nikola Motor Company Llc|Motor gearbox assembly|
    DE102017004205A1|2017-04-29|2018-01-04|Daimler Ag|Drive device for a commercial vehicle|
    法律状态:
    2020-07-07| BA2A| Patent application published|Ref document number: 2772623 Country of ref document: ES Kind code of ref document: A2 Effective date: 20200707 |
    2021-03-29| EC2A| Search report published|Ref document number: 2772623 Country of ref document: ES Kind code of ref document: R1 Effective date: 20210322 |
    优先权:
    申请号 | 申请日 | 专利标题
    IT102018000021025A|IT201800021025A1|2018-12-24|2018-12-24|MODULAR ELECTRIC TRACTION SYSTEM|
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