WO2022000702A1

WO2022000702A1 - Electric vehicle axle of vehicle

Info

Publication number: WO2022000702A1
Application number: PCT/CN2020/107366
Authority: WO
Inventors: 吴志强; 杨鹏飞; 李春光
Original assignee: 广东富华重工制造有限公司
Priority date: 2020-06-30
Filing date: 2020-08-06
Publication date: 2022-01-06
Also published as: CN113858885A

Abstract

An electric vehicle axle of a vehicle, comprising an axle housing (10), a reducer (20), and an electric motor (30). The reducer (20) comprises a housing (21) and a transmission assembly (22). The housing (21) is fixed on the axle housing (10). The electric motor (30) is provided within the space enclosed by the housing (21) and the axle housing (10). A housing of the electric motor (30) comprises a front end surface and a rear end surface opposite the front end surface. The front end surface is fixedly connected to the housing (21). Moreover, an output end of the electric motor (30) is connected to the transmission assembly (22). A support base (100) is fixed on the axle housing (10). A connecting base (40) is provided between the housing of the electric motor (30) and the support base (100). One end of the connecting base (40) is fixedly connected to the support base (100); at least one cushioning assembly is provided between the other end and the rear end surface of the housing of the electric motor. The cushioning assembly comprises a support rod (51) and a vibration isolator sleeve (52) is sleeved on the support rod (51). The vibration isolator sleeve (52) is embedded in a through hole (421) provided at the other end of the connecting base. The end of the support rod (51) facing the rear end surface of the housing of the electric motor (30) protrudes the connecting base (40) and is fixedly connected to the rear end surface of the housing of the electric motor (30). The utilization of the vibration isolator sleeve to cushion the rear end part of the electric motor provides a protective effect for the electric motor, thus increasing the service life of the electric motor.

Description

Electric drive axles of vehicles

technical field

The invention relates to the technical field of vehicles, in particular to an electric drive axle of a vehicle.

Background technique

Traditional commercial vehicles are driven by fuel, and their engines take up a lot of space and cause serious environmental pollution. With the continuous popularization of new energy technologies, some commercial vehicles have begun to use electric motors, that is, the drive axles of vehicles are equipped with motors to form Electric drive axle, which is to install the motor on the frame. Specifically, the outer casing of the motor is fixed on the axle housing of the axle through bolts, and the outer casing of the motor and the axle housing are rigidly connected. , the axle housing is deformed under pressure, and the deformation of the motor shell and the axle housing is not synchronized. The above-mentioned rigidly matched axle housing and motor will cause damage to the motor. When the accuracy is not high, it is easy to cause motor damage. SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the purpose of the present invention is to provide an electric drive axle of a vehicle, which can buffer the damage to the motor when the axle housing is deformed, and increase the service life of the motor.

To achieve the above object, the present invention adopts the following technical solutions:

The electric drive axle of the vehicle includes an axle housing, a reducer, and a motor. The reducer includes a housing and a transmission assembly. The housing is fixedly connected to the axle housing. The motor is placed in the space enclosed by the housing and the axle housing. The housing of the motor includes The front end face and the rear end face opposite to the front end face, the front end face is fixedly connected to the outer casing, and the output end of the motor is connected with the transmission assembly, a support is fixed on the axle housing, and the rear end face of the motor housing and the support are fixed. A connecting seat is arranged between the two ends, one end of the connecting seat is fixedly connected with the support, and at least one buffer assembly is arranged between the other end and the rear end face of the motor housing, and the buffer assembly includes a support rod and a buffer sleeve sleeved on the outside of the support rod. The shock-absorbing sleeve is embedded in the through hole opened at the other end of the connecting seat, and one end of the support rod facing the rear end surface of the motor housing protrudes out of the connecting seat and is fixedly connected with the rear end surface of the motor housing.

The support rod includes a polished rod part that penetrates into the shock-absorbing sleeve, and a penetration rod connected to one end of the polished rod part close to the motor. The rear end surface of the motor housing is provided with an insertion hole, and the penetration rod is penetrated into the insertion hole. to fix the support rod to the rear end of the motor housing.

The support rod also includes a threaded portion located at one end of the polished rod portion away from the motor, the threaded portion is screwed with a locking nut, the inner wall of the through hole is provided with a limit flange at one end of the through hole close to the motor, and the damping sleeve is limited to the limit flange and the limit flange. between the lock nuts.

The outer diameter of the threaded part is smaller than the outer diameter of the polished rod part, and a limit step is formed at the connection between the threaded part and the polished rod part, and a limit stop is clamped between the locking nut and the limit step, and the outer diameter of the limit block is larger than the inner diameter of the through hole.

A nut is also provided at the position where the polished rod part is connected with the connecting rod.

A boss is protruded from the rear end face of the motor housing, and the insertion hole is opened on the boss.

The support is provided with a support block protruding from one side of the axle housing, the connection seat is fixed on the support block by fastening bolts, and at least one adjustment washer is arranged between the support block and the connection seat.

There is a fixed block protruding from one side of the connection seat, the fixed block is placed on the support block, the fixed block is provided with multi-hole mounting holes, and the support block is provided with a plurality of bolt holes corresponding to the mounting holes one by one. The bolts pass through the mounting holes from top to bottom and then are screwed into the bolt holes.

The lower surface of the fixed block and the upper surface of the support block are both flat surfaces, and the adjusting pad is placed between the lower surface of the fixed block and the upper surface of the support block.

The casing of the reducer is provided with a first connection flange, the front end face of the motor is provided with a second connection flange, and the first connection flange and the second connection flange are fixed together by connection bolts.

The beneficial effects of the present invention are:

In the present invention, a support rod is used to fix the rear end of the motor housing, and a shock absorbing sleeve is arranged between the support rod and the connecting seat, so that the rear end of the motor housing and the connecting seat fixed on the axle housing are flexible In cooperation, when the axle housing is loaded and deformed, the rear end of the motor is buffered by the shock-absorbing sleeve, which protects the motor, prevents the motor from being damaged, and increases the service life of the motor.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the installation schematic diagram of the present invention;

FIG. 3 is a cross-sectional view of the place where the buffer assembly and the connecting seat are matched in FIG. 2 .

detailed description

Below, in conjunction with the accompanying drawings and specific embodiments, the present invention is further described:

As shown in Figures 1, 2 and 3, it is an electric drive axle of a vehicle according to the present invention, which includes an axle housing 10, a reducer 20, and a motor 30, wherein the reducer 20 includes a casing 21 and a transmission assembly 22. 21 is fixedly connected at the position of the pipa hole of the axle housing 10, and together with the pipa hole of the axle housing 10 forms an installation space, the transmission assembly 22 is placed in this installation space, and the axis of the motor 30 is consistent with the axial direction of the axle housing 10, The housing of the motor 30 includes a front end surface and a rear end surface opposite to the front end surface. The front end surface is fixedly connected to the housing 21 of the reducer 20 . Specifically, the housing 21 is provided with a first connection flange 211 , and the motor 30 A second connection flange 31 protrudes from the periphery of the front end surface of the housing, and the first connection flange 211 and the second connection flange 31 are fastened together by a plurality of connection bolts, so that the front end of the motor 30 housing is It is fixed with the casing 21 of the reducer 20. Of course, the front end surface of the motor 30 can also be fixed on the casing 21 of the reducer 20 by other connection methods; Then, it is coupled with the input end of the transmission assembly 22, so that the power of the motor 30 can be transmitted to the half shaft located in the axle housing 10 through the transmission assembly 22, and then transmitted to the wheel end through the half shaft to drive the vehicle. A support 100 is fixed on the axle housing 10. A connecting seat 40 is arranged between the rear end surface of the motor 30 and the support 100. The main part of the connecting seat 40 is a connecting arm 42, and one end of the connecting arm 42 is fixedly connected On the support 100 , at least one buffer assembly is disposed between the other end of the connecting arm 42 and the housing of the motor 30 . A through hole 421 is opened, and the shock absorbing sleeve 52 is sleeved on the outside of the support rod 51 and embedded in the through hole 421, that is to say, the shock absorbing sleeve 52 is placed between the inner wall of the through hole 421 and the support rod 51, One end of the support rod 51 facing the motor 30 is protruded from the connection seat 40 through the shock absorbing sleeve 52 , and the end of the support rod 51 is fixedly connected to the rear end surface of the motor 30 casing after protruding from the connection seat 40 .

In the above structure of the present invention, the support rod 51 is fixed on the rear end of the motor 30 casing, and a shock absorbing sleeve 52 is provided between the support rod 51 and the connecting seat 40, so that the rear end of the motor 30 casing is fixed to the The connection seat 40 on the axle housing 10 is flexibly matched, and when the axle housing 10 is loaded and deformed, the shock absorbing sleeve 52 is used to buffer the rear end of the motor 30 to protect the motor 30 and prevent the motor 30 from being damaged. damage, which increases the service life of the motor 30 .

In a preferred embodiment, the support rod 51 includes a polished rod portion 511 and a penetration rod 514 , wherein the polished rod portion 511 is penetrated into the shock-absorbing sleeve 52 , and the penetration rod 514 is an end of the polished rod portion 511 close to the motor 30 . Extending out, an insertion hole 33 is provided on the rear end surface of the housing of the motor 30 , and the penetration rod 514 penetrates into the insertion hole 33 to fix the support rod 51 on the rear end surface of the motor 30 housing. It is possible to open an external thread on the outside of the insertion rod 514, open an inner thread in the insertion hole 33, and screw the insertion rod 514 into the insertion hole 33. In this way, the insertion rod 514 is connected to the rear end surface of the housing of the motor 30. Screwed together, of course, the connecting rod 514 can also be fixed with the insertion hole 33 in other ways; in addition, a boss 32 is provided on the rear end surface of the housing of the motor 30, and the above-mentioned insertion hole 33 is provided in the On the boss 32, the insertion hole 33 has a relatively large axial dimension, so that the size of the insertion rod 514 inserted into the insertion hole 33 is correspondingly increased, so that the insertion rod 514 is not easy to pass from the insertion hole 33. More importantly, when the axle housing 10 is deformed, the connecting seat 40 drives the support rod 51 to swing. Since the size of the insertion rod 514 inserted into the insertion hole 33 is large, it can avoid the penetration rod 514 and the motor 30 . At the same time, the boss 32 is used to strengthen the part of the motor 30 casing at the periphery of the insertion hole 33 to ensure that the rear end surface of the motor 30 casing has better strength to withstand the support rod. 51 The larger stress caused by the swing.

In addition, the support rod 51 also includes a threaded portion 512 located at one end of the polished rod portion 511 away from the motor 30 , a locking nut 54 is screwed on the threaded portion 512 , and a limiting flange 422 is provided on the inner wall of the through hole 421 . The position flange 422 is located at one end of the through hole 421 close to the motor 30 , the end of the damping sleeve 52 close to the motor 30 abuts on the limiting flange 422 , and the locking nut 54 is located outside the other end of the damping sleeve 52 . Therefore, the damping sleeve 52 is defined between the limiting flange 422 and the locking nut 54; further, a limiting step is formed at the joint of the polished rod portion 511 of the threaded portion 512, and the outer diameter of the threaded portion 512 is smaller than the polished rod. The outer diameter of the threaded portion 512 is also sleeved with a limit stop piece 53 of the pressure head, the limit stop piece 53 is clamped between the limit step and the lock nut 54, and the outer diameter of the limit stop piece 53 is The diameter is larger than the inner diameter of the through hole 421 , and the limit block 53 and the connecting arm 42 are used to form a limit structure to prevent the support rod 51 from moving in a direction close to the motor 30 . In addition, a nut 513 is also provided at the position where the polished rod portion 511 and the connecting rod 514 are connected. The nut 513 cooperates with the connecting arm 42 to limit the position to prevent the support rod 51 from moving away from the motor 30 . At the same time, the nut 513 can facilitate the tightening of the lock nut 54 on the threaded portion 512 during installation.

In another limited embodiment of the present invention, a support block 11 is provided on the support 100 , the support block 11 is protruded and disposed on the side of the axle housing 10 close to the motor 30 , and the connection seat 40 is fixed on the side of the axle housing 10 by the fastening bolts 44 On the support block 11, and between the support block 11 and the connection seat 40, at least one adjustment washer 45 is arranged. The adjustment spacer 45 can be used to adjust the distance between the connection seat 40 and the support block 11 to change the installation of the connection seat 40. Therefore, the above-mentioned support rod 51 can be aligned with the housing of the motor 30 during installation, so as to overcome the difficult assembly problem caused by the machining error of the components. It may be that a plurality of stacked adjustment spacers 45 are arranged between the support block 11 and the connection seat 40. When the installation height of the connection seat 40 needs to be lowered, one or more adjustment spacers 45 are removed, and the connection seat needs to be increased. When the installation height is 40, one or more adjusting spacers 45 can be added.

In addition, a fixing block 41 is protruded from one side of the connecting arm 42, which is the main body of the connecting seat 40. The size of the fixing block 41 is the same as that of the supporting block 11. It is placed above the supporting block 11, and the gasket is adjusted 45 is clamped between the support block 11 and the fixed block 41, the fixed block 41 is provided with a plurality of mounting holes 411, the support block 11 is provided with a plurality of bolt holes 111, a plurality of bolt holes 111 and a plurality of mounting holes 411 In one-to-one correspondence, a pre-tightening washer 43 is also provided on the fixing block 41 , and the plurality of fastening bolts 44 pass through the pre-tightening washer 43 from top to bottom, and pass through the plurality of mounting holes 411 in a one-to-one correspondence, respectively. The fixing block 41 and the supporting block 11 are fixedly connected together by being screwed into a plurality of bolt holes 111 . Of course, to increase the adjustment accuracy, the lower surface of the above-mentioned fixed block 41 and the upper surface of the support block 11 of the present invention are both flat, and the adjustment pad 45 is clamped between the lower surface of the fixed block 41 and the upper surface of the support block 11. between.

In the present invention, between the connection seat 40 and the rear end surface of the motor 30 casing, only one of the above-mentioned buffer components may be provided, or as shown in FIGS. Three buffer assemblies are arranged between the end faces, and the three buffer assemblies form a triangular support structure. Of course, in other embodiments, different numbers of buffer assemblies can be arranged as required.

The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it is still possible to understand the technical solutions of the foregoing embodiments. The recorded technical solutions are modified, or some technical features thereof are equivalently replaced, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

The electric drive axle of a vehicle is characterized in that it includes an axle housing, a reducer, and a motor. The reducer includes a casing and a transmission assembly, the casing is fixedly connected to the axle casing, and the motor is placed in the space enclosed by the casing and the axle casing. The housing includes a front end surface and a rear end surface opposite to the front end surface, the front end surface is fixedly connected to the outer casing, and the output end of the motor is connected with the transmission assembly, a support is fixed on the axle housing, and the rear end surface of the motor housing is fixed A connecting seat is arranged between the support and the support, one end of the connecting seat is fixedly connected with the support, and at least one buffer assembly is arranged between the other end and the rear end face of the motor housing, and the buffer assembly includes a support rod, sleeved on the support The shock-absorbing sleeve on the outside of the rod, the shock-absorbing sleeve is embedded in the through hole opened at the other end of the connecting seat, and the end of the support rod facing the rear end surface of the motor housing protrudes out of the connecting seat and is fixedly connected with the rear end surface of the motor housing .
The electric drive axle of a vehicle according to claim 1, wherein the support rod comprises a polished rod part penetrating into the shock-absorbing sleeve, and a penetrating rod connected to one end of the polished rod part close to the motor; The rear end surface is provided with an insertion hole, and the insertion rod is inserted into the insertion hole to fix the support rod and the rear end surface of the motor housing.
The electric drive axle of a vehicle according to claim 2, wherein the support rod further comprises a threaded portion located at one end of the polished rod portion away from the motor, the threaded portion is screwed with a locking nut, and the inner wall of the through hole is close to one end of the motor A limit flange is provided, and the damping sleeve is defined between the limit flange and the lock nut.
The electric drive axle of a vehicle according to claim 3, wherein the outer diameter of the threaded portion is smaller than the outer diameter of the polished rod portion, and a limit step is formed at the joint of the threaded portion and the polished rod portion, and the locking nut and the limit step A limit block is sandwiched therebetween, and the outer diameter of the limit block is larger than the inner diameter of the through hole.
The electric drive axle of a vehicle according to claim 4, characterized in that a nut is further provided at the position where the polished rod part is connected with the connecting rod.
The electric drive axle of a vehicle according to claim 2, wherein a boss is protruded from the rear end face of the motor housing, and the insertion hole is opened on the boss.
The electric drive axle of a vehicle according to claim 1, wherein a support block protruding from one side of the axle housing is provided on the support, the connecting seat is fixed on the support block by fastening bolts, and the support block is connected to the support block. At least one adjusting shim is arranged between the connection bases.
The electric drive axle of a vehicle according to claim 7, wherein a fixed block protrudes from one side of the connecting seat, the fixed block is placed on the support block, and the fixed block is provided with a porous mounting hole, a support block The block is provided with a plurality of bolt holes corresponding to the installation holes one-to-one, and the fastening bolts pass through the installation holes from top to bottom and then are screwed into the bolt holes.
The electric drive axle of a vehicle according to claim 8, wherein the lower surface of the fixed block and the upper surface of the support block are both flat surfaces, and the adjusting washer is placed between the lower surface of the fixed block and the upper surface of the support block between.
The electric drive axle of a vehicle according to claim 1, wherein a first connection flange is arranged on the casing of the reducer, a second connection flange is arranged on the front end surface of the motor, and the first connection flange and the first connection flange are arranged on the front end of the motor. The two connecting flanges are fixed together by connecting bolts.