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CN-224229202-U - Transmission device for electric drive axle and electric drive axle

CN224229202UCN 224229202 UCN224229202 UCN 224229202UCN-224229202-U

Abstract

The application relates to a transmission device for an electric drive axle, which comprises a shell, a transmission shaft, a stress part, a bearing and a bearing outer ring, wherein the transmission shaft is arranged in the shell and is provided with a first end and a second end which are axially opposite, the stress part is arranged on the transmission shaft, the stress part is subjected to axial force towards the first end under at least one working state, the bearing comprises a bearing inner ring and a bearing outer ring which can rotate relatively, the bearing inner ring is arranged on the transmission shaft and is positioned between the stress part and the first end, the bearing inner ring is subjected to axial force of the stress part under at least one working state, the bearing outer ring is indirectly or directly supported on the shell and is subjected to axial force towards the second end, and the bearing outer ring is arranged on the transmission shaft and is prevented from axially moving towards the first end by a stop part. The application also relates to an electric drive axle. The bearing inner ring is capable of assisting the bearing inner ring to resist axial impact, so that the service life of the transmission device is prolonged.

Inventors

  • ZONG WEI

Assignees

  • 博世氢动力系统(重庆)有限公司

Dates

Publication Date
20260512
Application Date
20250716

Claims (10)

  1. 1. A transmission for an electric drive axle, characterized in that the transmission (1) comprises: a housing (11); A drive shaft (12) mounted within the housing (11) and having axially opposed first (128) and second (129) ends; A force-receiving member (14) mounted on the drive shaft (12), the force-receiving member (14) being subjected to an axial force towards the first end (128) in at least one operating state; A bearing (13) comprising a bearing inner ring (130) and a bearing outer ring (132) capable of rotating relatively, the bearing inner ring (130) being mounted to the drive shaft (12) and located between the force-receiving member (14) and the first end (128), the bearing inner ring (130) being subjected to an axial force of the force-receiving member (14) in the at least one operating state, the bearing outer ring (132) being indirectly or directly supported to the housing (11) and being subjected to an axial force of the housing (11) towards the second end (129); And a stop part (15) arranged on the transmission shaft (12), wherein the stop part (15) prevents the bearing inner ring (130) from axially moving towards the first end (128).
  2. 2. Transmission for an electric drive axle according to claim 1, characterized in that the force-receiving member (14) and the bearing inner ring (130) are each fitted over the drive shaft (12) from the first end (128) to the second end (129), the transmission (1) comprising a stop (5), the stop (5) comprising a fixing portion (50) adapted to be fixedly attached to the drive shaft (12) and comprising the stop portion (15), the fixing portion (50) carrying the stop portion (15).
  3. 3. A transmission for an electric drive axle as claimed in claim 2, characterized in that, The stop (15) is integral with the fixing portion (50), and/or The fixing part (50) is fixedly arranged on the transmission shaft (12) in a threaded connection mode or an interference fit mode, and/or The stop (5) is fixed to an end face (122) or a peripheral face of the drive shaft (12).
  4. 4. A transmission for an electric drive axle as claimed in claim 2, characterized in that, The stop piece (5) is provided with a stud section (51) serving as the fixing part (50), and an end face (122) of the transmission shaft (12) is provided with an end face threaded hole (120) suitable for installing the stud section (51); the stop (5) has a flange section (52) which protrudes radially beyond the end face (122) of the drive shaft (12), the flange section (52) forming the stop (15); -the bearing inner ring (130) axially extends beyond the end face (122) of the drive shaft (12) or axially is flush with the end face (122) of the drive shaft (12); The stop piece (5) is provided with an axial through hole (57), and the axial through hole (57) is communicated with a central oil through hole (121) of the transmission shaft (12); The stop (5) has a sealing section (6) on the side of the flange section (52) facing away from the stud section (51), the sealing section (6) being provided with a sealing ring groove (60) adapted to mount a sealing ring via which the sealing section (6) and the housing (11) are radially sealed; The diameter of the sealing section (6) is smaller than the diameter of the end face (122) of the transmission shaft (12).
  5. 5. Transmission for an electric drive axle according to claim 2, characterized in that the drive shaft (12) has a first mounting section (124) adapted to mount the bearing inner ring (130) and a second mounting section (125) with external threads adjoining the first mounting section (124) axially against a first end (128), the second mounting section (125) having a diameter smaller than or equal to the first mounting section (124), the stop (5) having a stop threaded bore (55) adapted to mount to the second mounting section (125) as the fixing part (50).
  6. 6. Transmission for an electric drive axle according to claim 2, characterized in that the stop (5) is a bayonet (56) or a retaining ring, and that the circumference of the drive shaft (12) is provided with a mounting groove (126) adapted to mount the bayonet (56) or retaining ring.
  7. 7. The transmission for an electric drive axle according to claim 1, characterized in that the drive shaft (12) has a projection (127) integral with the drive shaft (12), the projection (127) forming the stop (15).
  8. 8. The transmission for an electric drive axle according to any one of claims 1 to 7, characterized in that, The force-receiving member (14) is a helical gear adapted to be mounted to the drive shaft (12); The bevel gear is axially adjacent to the bearing inner ring (130) in the mounted state.
  9. 9. The transmission for an electric drive axle according to any one of claims 1 to 7, characterized in that, In the at least one operating state, a radial force component and an axial force component are present between the bearing inner ring (130) and the bearing outer ring (132), and/or The bearing (13) is a tapered roller bearing and comprises tapered rollers as rolling elements (131), and/or The bearing outer ring (132) is supported on the housing (11) via a spacer, and/or The bearing inner ring (130) is in interference fit with the transmission shaft (12), and/or The housing (11) has an oil delivery channel (110) for delivering oil to a central oil opening (121) of the drive shaft (12), and/or The transmission (1) is a speed reducer and/or The drive shaft (12) is a gear shift shaft provided with a plurality of gear shift gears (19), and/or The stop (15) is attached to the inner bearing ring (130).
  10. 10. An electric drive axle, characterized in that it comprises an electric motor (2) and a transmission for an electric drive axle according to any one of claims 1 to 9 connectable to the electric motor (2).

Description

Transmission device for electric drive axle and electric drive axle Technical Field The application relates to a transmission for an electric drive axle and to an electric drive axle. Background A transmission, in particular a reduction gear, for an electric drive axle has a drive shaft. The drive shaft is supported in the housing of the drive device by a bearing. The bearing comprises a bearing inner ring and a bearing outer ring, wherein the bearing inner ring is arranged on the transmission shaft in an interference fit mode, and the bearing outer ring is arranged on the shell. The bearing outer race is additionally supported by the housing in an axial direction. In the prior art, the bearing is generally considered to be fixed without additional positioning measures based on the manner in which the bearing inner ring is mounted by an interference fit and the axial support of the housing to the bearing outer ring. The applicant has surprisingly found that when a transmission member is provided beside the bearing, the bearing inner race of the bearing is subject to axial impact by the beside transmission member and still displaced, whereby the bearing may fail prematurely. Disclosure of utility model The object of the present application is to provide a transmission for an electric drive axle which in particular makes it possible to help resist axial impacts to which the bearing inner race is subjected, in order to increase the life of the transmission. According to a first aspect of the present application there is provided a transmission for an electric drive axle, characterised in that the transmission comprises: A housing; A drive shaft mounted within the housing and having axially opposed first and second ends; A force-receiving member mounted on the drive shaft, the force-receiving member receiving an axial force toward the first end in at least one operating state; The bearing comprises a bearing inner ring and a bearing outer ring which can rotate relatively, the bearing inner ring is arranged on the transmission shaft and is positioned between the stress component and the first end, the bearing inner ring is subjected to the axial force of the stress component in the at least one working state, and the bearing outer ring is indirectly or directly supported on the shell and is subjected to the axial force of the shell towards the second end; The stop part is arranged on the transmission shaft and used for preventing the bearing inner ring from axially moving towards the first end direction. According to an alternative embodiment of the application, the force-receiving member and the bearing inner ring are each fitted over the drive shaft from the first end to the second end, the drive means comprising a stop member comprising a fixing portion adapted to be fixedly mounted to the drive shaft and comprising the stop portion, the fixing portion carrying the stop portion. According to an alternative embodiment of the application, the stop is integral with the fixing part, and/or the fixing part is fixedly mounted to the transmission shaft in the form of a threaded connection or an interference fit, and/or the stop is fixed to an end face or a peripheral face of the transmission shaft. According to an alternative embodiment of the application, the stop has a stud section as the fixing part, the end face of the drive shaft is provided with an end face threaded hole suitable for mounting the stud section, the stop has a flange section which extends radially beyond the end face of the drive shaft, the flange section forms the stop part, the bearing inner ring extends axially beyond the end face of the drive shaft or is axially flush with the end face of the drive shaft, the stop has an axial through hole which is communicated with a central oil hole of the drive shaft, the stop has a sealing section on the side of the flange section facing away from the stud section, the sealing section is provided with a sealing ring groove suitable for mounting a sealing ring, the sealing section and the shell realize radial sealing through the sealing ring, and the diameter of the sealing section is smaller than that of the end face of the drive shaft. According to an alternative embodiment of the application, the drive shaft has a first mounting section adapted to mount the bearing inner ring and a second mounting section with external threads adjacent to the first mounting section axially against a first end, the second mounting section having a diameter smaller than or equal to the first mounting section, the stop having a stop threaded bore adapted to mount to the second mounting section as the fixing portion. According to an alternative embodiment of the application, the stop is a bayonet or a retainer ring, and the peripheral surface of the transmission shaft is provided with a mounting groove adapted to mount the bayonet or retainer ring. According to an alternative embodiment of the application, the drive shaft