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CN-122001146-A - Power assembly mechanism and installation method thereof

CN122001146ACN 122001146 ACN122001146 ACN 122001146ACN-122001146-A

Abstract

The invention discloses a power assembly mechanism and an installation method thereof, wherein the power assembly mechanism comprises a power assembly shell, a speed reducer shell and a speed reducer shell, wherein the power assembly shell is used for installing a motor shell, the side surface of the power assembly shell is detachably connected with the speed reducer shell, the speed reducer shell is used for installing a speed reducer assembly, and positioning structures are arranged in the power assembly shell and the speed reducer shell. By adopting the technical scheme, through the positioning of the bearings at the two ends and the integrated shafting, the split shaft centering deviation and the accumulation of spline side gaps are eliminated from the source, the gear impact abnormal sound during the 1-4-order shaft frequency noise and accelerator switching is avoided, meanwhile, the structure is simplified, the number of parts is small, the rigidity is high, and the excellent NVH performance is ensured while the cost and the weight are reduced.

Inventors

  • LI ZHUO
  • LIAO YONGJUN
  • QIN TIAN

Assignees

  • 御传(上海)传动科技有限公司
  • 江苏御传新能源科技有限公司
  • 重庆御传新能源科技有限公司

Dates

Publication Date
20260508
Application Date
20260407

Claims (10)

  1. 1. A locomotion assembly mechanism, comprising: The power assembly shell is used for installing the motor shell; the outer wall of the power assembly shell is detachably connected with a speed reducer shell, and the speed reducer shell is used for installing a speed reducer assembly, wherein positioning structures are arranged in the power assembly shell and the speed reducer shell; The positioning structure comprises a first bearing, a second bearing and an integrated shaft; The second bearings and the first bearings are arranged at two ends of the integrated shaft and are used for positioning the two ends of the integrated shaft and reducing deformation of the integrated shaft; one end of the integrated shaft, which is close to the second bearing, is sleeved in the motor shell, and the outer wall of the second bearing is mounted in an adaptive manner with the interior of the motor shell; The outer wall of one end of the integrated shaft, which is close to the first bearing, is provided with a gear structure, and the gear structure is in meshed connection with the speed reducer assembly and is used for reducing the dislocation amount of the speed reducer assembly; The first bearing is positioned on the side surface of the speed reducer assembly and is arranged in the speed reducer shell in a matching way.
  2. 2. The power assembly mechanism according to claim 1, wherein a centering tool is adaptively installed on the outer wall of one end, close to the first bearing, of the integrated shaft, the inner portion of the centering tool comprises a first tool half body and a second tool half body, the first tool half body and the second tool half body are of a two-half splicing structure, and the outer wall of the integrated shaft is sleeved in a surrounding mode.
  3. 3. The power assembly mechanism according to claim 1, wherein the motor housing comprises a motor rear shell end cover, a stator and a rotor, wherein the motor rear shell end cover is fixedly arranged at one end of the motor housing, which is far away from the speed reducer housing, a mounting hole for supporting the outer wall of the second bearing is formed in the motor rear shell end cover, the stator is arranged in the motor housing, the rotor is arranged in the stator, and the rotor and the integrated shaft are sleeved with each other near the outer wall of one end of the second bearing.
  4. 4. The power assembly mechanism of claim 3, wherein a bearing mounting hole for supporting the outer wall of the first bearing is formed in the interior of one side of the speed reducer housing, which is far away from the motor rear housing end cover.
  5. 5. The power assembly mechanism according to claim 1, wherein bearing positioning cavities for positioning the second bearing and the first bearing are formed in two ends of the integrated shaft, a vibration reduction assembly for reducing vibration of the second bearing and the first bearing is arranged in each bearing positioning cavity, the vibration reduction assembly comprises rubber and an air bag, the rubber and the air bag are overlapped to form a supporting structure, the rubber is used for medium-high frequency vibration attenuation and basic positioning, and the air bag is used for low-frequency resonance suppression and rigidity self-adaptive adjustment.
  6. 6. The power assembly mechanism according to claim 5, wherein a bearing reinforcement is detachably mounted in the vibration reduction assembly and used for reinforcing the second bearing and the first bearing, the bearing reinforcement is in threaded connection with a vibration reduction supporting seat used for supporting the vibration reduction assembly, an embedded screw pin is mounted in the vibration reduction supporting seat in a threaded manner and penetrates through the vibration reduction supporting seat, and an embedded groove formed in the bearing positioning cavity is embedded with the embedded screw pin and used for enabling the vibration reduction supporting seat to be sleeved in the bearing positioning cavity and not to move.
  7. 7. The power assembly mechanism according to claim 6, wherein the vibration reduction support seat is provided with a rigidity adjusting assembly in an embedded manner on the circumferential outer wall, the rigidity adjusting assembly comprises a first air storage adjusting assembly, an air flow communicating pipe and a second air storage adjusting assembly, the first air storage adjusting assembly and the second air storage adjusting assembly are mounted on the circumferential outer wall of the vibration reduction support seat and are communicated with each other through the air flow communicating pipe and used for rigidity adjustment of the air bag.
  8. 8. The locomotion assembly mechanism of claim 6, wherein the vibration damping assembly is attached with a pre-tightening assembly comprising a pre-tightening block attached to the bottom of the air bag for pre-tightening the air bag and the rubber.
  9. 9. The power assembly mechanism of claim 8, wherein the pre-tightening assembly further comprises a lateral opening, a clamping rod, a rubber block, a lever and a pushing rod, the lateral opening is formed in the side face of the vibration reduction supporting seat, the clamping rod is clamped on two sides of the lateral opening, which are close to the opening, through holes, the rubber block is fixedly connected to the outer wall of the clamping rod, the lever is fixedly installed on the outer wall, which is far away from the clamping rod, of the rubber block, one end of the lever is fixedly connected with the pre-tightening block through the pushing rod, and the pushing rod is used for pushing the pre-tightening block to move upwards to pre-tighten the air bag and the rubber.
  10. 10. A method of installing a powertrain mechanism as claimed in any one of claims 1 to 9, the method comprising the steps of: S1, preparing, namely sleeving a vibration reduction assembly and a vibration reduction supporting seat in bearing positioning cavities formed at two ends of an integrated shaft, and installing bearing reinforcing members into the vibration reduction supporting seat in a threaded manner so that the vibration reduction assembly can be limited on the outer wall of the vibration reduction supporting seat; S2, mounting, namely mounting a stator into a motor shell, positioning and fastening the stator and the motor shell, pre-assembling a rotor and a positioning structure, axially pressing the stator into an inner cavity of the stator, realizing coaxial assembly of the stator and the rotor, ensuring uniform air gap, mounting a motor rear shell end cover into the motor shell, mutually sleeving a mounting hole and a second bearing at one end of the positioning structure, completing axial limiting of the rotor and sealing of a power assembly shell, mounting a speed reducer assembly into the speed reducer shell, mounting a centering tool at the output shaft end of an integrated shaft, wherein the centering tool is a two-half splicing tool, an inner ring of the centering tool is matched with the integrated shaft, an outer ring of the centering tool is matched with a shell hole of the speed reducer shell, mounting a first bearing at one end of the integrated shaft far from the second bearing in a pressing manner, completing radial support and axial positioning of a shaft system, measuring the axial clearance of the shaft system, selecting an adjusting gasket with corresponding thickness, eliminating the clearance and ensuring pre-tightening force, mounting the speed reducer shell and the power assembly shell in a box, and fixing the bearing mounting hole formed in the speed reducer shell and the first outer wall in a sleeved manner, and finally fastening the whole bearing and the whole shell in a sealing manner; and S3, if the centering tool is applied to the oil-cooled electric drive, canceling the step of installing the centering tool.

Description

Power assembly mechanism and installation method thereof Technical Field The invention relates to the technical field of power assemblies of new energy automobiles, in particular to a power assembly mechanism and an installation method thereof. Background In the current society, the requirements of consumers on the overall quality of automobiles are continuously improved, the requirements on automobile parts are also improved, particularly in the aspect of driving experience, the requirements of users on the NVH performance of the automobiles are increasingly severe, and for new energy automobiles, an electric drive assembly is a core part, and the NVH level of the electric drive assembly directly determines the NVH performance of the whole automobile; In the current main current drive assembly, a motor and a speed reducer are in split type design, torque is transmitted by the motor and the speed reducer through a spline to drive a vehicle, as shown in a four-bearing electric drive and a three-bearing electric drive in fig. 20 and 21, the essential difference of the structure is small, a motor front bearing is mainly simplified, a motor shaft and a speed reducer shaft are still in split structures, the problem of centering deviation and side gap accumulation easily occurs after assembly, namely, the centering deviation easily causes shaft frequency vibration, the frequency doubling noise is represented as electric drive 1 order, 2 order, 3 order, 4 order and the like, and the side gap accumulation can generate gear engagement impact and bump abnormal sound under the condition of sudden acceleration or sudden unloading, so that the problems are difficult to radically eliminate, and the NVH performance of the electric drive and the driving quality of the whole vehicle are severely restricted. Therefore, the power assembly mechanism capable of eliminating the problems of shaft centering deviation and backlash accumulation and greatly improving the NVH performance of the electric drive is a problem to be solved in the field. Disclosure of Invention The invention aims to solve the problem that neutral deviation and side clearance accumulation of a power assembly mechanism in the prior art cause the NVH performance to be reduced. In order to solve the above problems, the present invention discloses a power assembly mechanism comprising: The power assembly shell is used for installing the motor shell; the outer wall of the power assembly shell is detachably connected with a speed reducer shell, and the speed reducer shell is used for installing a speed reducer assembly, wherein positioning structures are arranged in the power assembly shell and the speed reducer shell; The positioning structure comprises a first bearing, a second bearing and an integrated shaft; The second bearings and the first bearings are arranged at two ends of the integrated shaft and are used for positioning the two ends of the integrated shaft and reducing deformation of the integrated shaft; one end of the integrated shaft, which is close to the second bearing, is sleeved in the motor shell, and the outer wall of the second bearing is mounted in an adaptive manner with the interior of the motor shell; The outer wall of one end of the integrated shaft, which is close to the first bearing, is provided with a gear structure, and the gear structure is in meshed connection with the speed reducer assembly and is used for reducing the dislocation amount of the speed reducer assembly; The first bearing is positioned on the side surface of the speed reducer assembly and is arranged in the speed reducer shell in a matching way. By adopting the technical scheme, through the positioning of the bearings at the two ends and the integrated shafting, the split shaft centering deviation and the accumulation of spline side gaps are eliminated from the source, the gear impact abnormal sound during the 1-4-order shaft frequency noise and accelerator switching is avoided, meanwhile, the structure is simplified, the number of parts is small, the rigidity is high, and the excellent NVH performance is ensured while the cost and the weight are reduced. According to another specific embodiment of the invention, a centering tool is adaptively installed on the outer wall of one end, close to the first bearing, of the integrated shaft, the centering tool comprises a first tool half body and a second tool half body, the first tool half body and the second tool half body are of a two-half splicing structure, and the first tool half body and the second tool half body are circumferentially sleeved on the outer wall of the integrated shaft. According to another specific embodiment of the invention, the motor shell comprises a motor rear shell end cover, a stator and a rotor, wherein the motor rear shell end cover is fixedly arranged at one end, far away from the speed reducer shell, of the motor shell, a mounting hole for supporting the outer wall of the second bearing is