Vertically-arranged electric drive rear axle

Abstract

A vertically-arranged electrically-driven rear axle comprises a rear axle housing, a differential mechanism, a speed reducer box and a motor, the differential mechanism is located in a tooth bag of the rear axle housing, the speed reducer box is located behind the rear axle housing and fixedly connected with the rear axle housing, a bevel gear shaft is arranged in the speed reducer box, the bevel gear shaft is horizontally arranged, and the motor is fixedly connected with the bevel gear shaft. A driving bevel gear of the bevel gear shaft is meshed with a second-stage speed reduction driven gear of the differential mechanism, a first-stage speed reduction driven gear is arranged on the bevel gear shaft, the motor is a horizontal motor, a rotating shaft of the motor and the bevel gear shaft are the same in the axial direction and are arranged in a staggered mode, and a first-stage driving gear on the rotating shaft is meshed with the first-stage speed reduction driven gear arranged on the bevel gear shaft. A shell of the motor is fixedly connected with the speed reducer box through bolts.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric drive rear axles, in particular to a vertically arranged electric drive rear axle. Background Art

[0002] At present, most commercial vehicles' electric drive axles use parallel-axis electric drive axles. Parallel-axis electric drive axles include components such as motors, reducers, and drive axle assemblies. The motors and reducers are often arranged parallel to the bridge housing, and the power of the motors is transmitted to the wheels through a gear structure to drive the vehicle forward.

[0003] However, the transmission chain of such a parallel-axis electric drive axle is relatively long, and the power is distributed to the wheels through multiple links such as the motor, reducer, and differential. This complex transmission chain structure is prone to vibration and impact during power transmission, which in turn causes vibration power load imbalance. In addition, in a parallel-axis electric drive axle, the motor is usually offset to one or both sides of the bridge housing, rather than being located in the center of the bridge housing. This layout will cause the weight of the motor to produce an uneven load on the bridge housing, causing the center of gravity to shift, resulting in an unstable motion state of the vehicle during driving, such as roll, deviation, etc., which will affect the passenger's riding comfort and the overall quality of the vehicle.

[0004] The Chinese utility model patent with authorization announcement number CN205930205U discloses a vertical motor rear axle, in which the motor is arranged in a vertical direction, which occupies a large space of the automobile chassis and is not compact enough. Summary of the invention

[0005] The purpose of the utility model is to solve the problems existing in the prior art and propose a vertically arranged electric drive rear axle. The motor of the electric drive rear axle is a horizontal motor, and the motor is staggered, leaving space for the installation of the motor controller. The motor shaft of the utility model is axially the same as the bevel gear shaft and is staggered, and the motor shaft and the bevel gear shaft are perpendicular to the extension direction of the rear axle housing. Compared with the parallel shaft arrangement of the prior art, the electric drive rear axle of this structure has no axial load problem, which improves the maneuverability and center of gravity offset of the whole vehicle. Compared with the vertical motor of the prior art, it saves vertical space.

[0006] The purpose of the utility model is achieved in this way.

[0007] A vertically arranged electric drive rear axle includes a rear axle housing, a differential, a reducer box, and a motor. The differential is located in the ring gear housing of the rear axle housing. The reducer box is located behind the rear axle housing and is fixedly connected to the rear axle housing. A bevel gear shaft is arranged horizontally in the reducer box. The driving bevel gear of the bevel gear shaft meshes with the secondary reduction driven gear of the differential. A primary reduction driven gear is arranged on the bevel gear shaft. The motor is a horizontal motor. The motor shaft is axially the same as the bevel gear shaft and is arranged in a staggered manner. The primary driving gear on the shaft meshes with the primary reduction driven gear arranged on the bevel gear shaft. The housing of the motor is fixedly connected to the reducer box through bolts.

[0008] Further, it also includes a motor housing. The motor housing is connected to the reducer box through bolts. The motor housing is arranged in a staggered manner relative to the bevel gear shaft, leaving an installation space for installing a motor controller.

[0009] Further, it also includes a motor housing. An extension part extends horizontally at the mouth end of the motor housing. One end of the bevel gear shaft where the driving bevel gear is arranged extends into the reducer box, and the end where the primary reduction driven gear is arranged is supported in the extension part of the motor housing. Two tapered bearings are arranged axially between the driving bevel gear and the primary reduction driven gear. An elastic spacer is arranged between the two tapered bearings for pressing against the two tapered bearings.

[0010] Furthermore, both ends of the elastic spacer are in clearance fit with the bevel gear shaft, and a radial arc-shaped protrusion is arranged in the middle of the elastic spacer.

[0011] Further, the bevel gear shaft is integrally formed.

[0012] Further, the secondary reduction driven gear is a crown gear, and the crown gear is fixedly connected to the flange of the differential through bolts.

[0013] The vertically arranged electric drive rear axle of the present utility model solves the problem of axial offset load compared with the parallel-axis structure electric drive axle in the prior art, and the reducer box and the motor housing perpendicular to the rear axle housing occupy less space, improving the vehicle handling performance and the center of gravity offset; compared with the vertical motor in the prior art, it also saves space in the vertical direction.

[0014] The following further explains the present utility model in combination with the specification drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present utility model.

[0016] Figure 2 is Figure 1 an enlarged view of part A in

[0017] Figure 3It is a structural schematic diagram of a motor housing. Specific implementation manner

[0018] See Figures 1 to 2 , a vertically arranged electric drive rear axle, including a rear axle housing 1, a differential 2, a reduction gearbox, and a motor 3. The differential 2 is located in the axle housing 4 of the rear axle housing 1. The reduction gearbox is located behind the rear axle housing 1 and is fixedly connected to the rear axle housing 1. A bevel gear shaft 5 is arranged in the reduction gearbox. The bevel gear shaft 5 is horizontally arranged and integrally formed. The driving bevel gear 6 of the bevel gear shaft 5 meshes with the secondary reduction driven gear 7 of the differential. The secondary reduction driven gear 7 is a crown gear, and the crown gear is fixedly connected to the flange of the differential 2 by bolts. A primary reduction driven gear 8 is arranged on the bevel gear shaft 5. The motor 3 is a horizontal motor. The rotating shaft of the motor 3 is axially the same as that of the bevel gear shaft 5 and is arranged in a staggered manner, that is, the rotating shaft of the motor 3 is horizontally arranged and perpendicular to the extending direction of the rear axle housing. The primary driving gear 9 on the rotating shaft meshes with the primary reduction driven gear 8 arranged on the bevel gear shaft 5. The housing of the motor 3 is fixedly connected to the reduction gearbox by bolts.

[0019] It further includes a motor housing 10. The motor housing 10 is connected to the reduction gearbox by bolts. See Figure 3 , the motor housing 10 is arranged in a staggered manner relative to the bevel gear shaft 5, leaving an installation space for installing a motor controller 11, reducing the axial offset load. An extension part 12 extends horizontally at the mouth end of the motor housing 10. One end of the bevel gear shaft 5 where the driving bevel gear 6 is arranged extends into the reduction gearbox, and the end where the primary reduction driven gear 8 is arranged is supported in the extension part 12 of the motor housing 10. Two tapered bearings 13 are arranged axially between the driving bevel gear 6 and the primary reduction driven gear 8. An elastic spacer 14 is arranged between the two tapered bearings 13 for pressing against the two tapered bearings 13. The two ends of the elastic spacer 14 are in clearance fit with the bevel gear shaft 5. An arc-shaped protrusion 15 is arranged radially in the middle of the elastic spacer 14. The elastic spacer 14 with the arc-shaped protrusion 15 does not require shim adjustment compared with a cylindrical spacer and can be directly assembled.

[0020] For a vertically arranged electric drive rear axle of the present invention, the motor 3 of the electric drive rear axle is a horizontal motor, and the motor housing 10 is arranged in a staggered manner, leaving an installation space for the motor controller 11, reducing the axial offset load. The rotating shaft of the motor 3 of the present invention is axially the same as that of the bevel gear shaft 5 and is arranged in a staggered manner, and the rotating shaft of the motor 3 and the bevel gear shaft 5 are both perpendicular to the extending direction of the rear axle housing 1. Compared with the prior art of parallel shaft arrangement, the electric drive rear axle with such a structure has no axial offset load problem, improving the vehicle handling performance and the center of gravity offset. Compared with the prior art of vertical motors, the vertical space is saved.

[0021] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications made to the present utility model by those skilled in the art without departing from the spirit of the present utility model fall within the protection scope of the present utility model.

Claims

1. A vertically arranged electric drive rear axle, comprising a rear axle housing (1), a differential (2), a reducer box, and a motor (3), wherein the differential (2) is located in a tooth package (4) of the rear axle housing (1), and characterized in that: The reducer box is located behind the rear axle housing (1) and is fixedly connected to the rear axle housing (1). A bevel gear shaft (5) is arranged in the reducer box. The bevel gear shaft (5) is arranged horizontally. The driving bevel gear (6) of the bevel gear shaft (5) meshes with the secondary reduction driven gear (7) of the differential. The bevel gear shaft (5) is provided with a primary reduction driven gear (8). The motor (3) is a horizontal motor. The rotating shaft of the motor (3) and the bevel gear shaft (5) are axially the same and staggered. The primary driving gear (9) on the rotating shaft meshes with the primary reduction driven gear (8) provided on the bevel gear shaft (5). The housing of the motor (3) is fixed to the reducer box by bolts.

2. The vertically arranged electric drive rear axle according to claim 1, characterized in that: It also includes a motor housing (10), the motor housing (10) being connected to the reducer box via bolts, the motor housing (10) being arranged offset relative to the bevel gear shaft (5), leaving an installation space for installing a motor controller (11).

3. The vertically arranged electric drive rear axle according to claim 1, characterized in that: The invention also comprises a motor housing (10), an extension portion (12) extending in the horizontal direction from the opening end of the motor housing (10), one end of the bevel gear shaft (5) provided with a driving bevel gear (6) extending into the reducer box, one end of a primary reduction driven gear (8) supported in the extension portion (12) of the motor housing (10), two bevel bearings (13) arranged axially between the driving bevel gear (6) and the primary reduction driven gear (8), and an elastic spacer (14) arranged between the two bevel bearings (13) for pressing against the two bevel bearings (13).

4. The vertically arranged electric drive rear axle according to claim 3, characterized in that: The two ends of the elastic spacer (14) are clearance-matched with the bevel gear shaft (5), and a radial arc-shaped protrusion (15) is provided in the middle of the elastic spacer (14).

5. The vertically arranged electric drive rear axle according to claim 1, characterized in that: The bevel gear shaft (5) is integrally formed.

6. The vertically arranged electric drive rear axle according to claim 1, characterized in that: The secondary reduction driven gear (7) is a bowl gear, and the bowl gear is fixedly connected to the flange of the differential (2) via bolts.

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