CN209492375U - Universal electric drive axle - Google Patents

Abstract

The utility model claims to protect a universal electric drive axle, which includes a symmetrically arranged motor and a symmetrically arranged planetary reduction mechanism. The planetary reduction mechanism includes a first-stage planetary reducer and a second-stage planetary reducer. The reducer is connected by gear meshing, the first-stage planetary reducer and the second-stage planetary reducer are connected by gear meshing, and the second-stage planetary reducer is splined with the transmission shaft. The rotor shaft of the motor is the power input end, which sequentially transmits torque through the first-stage planetary reducer and the second-stage planetary reducer to the transmission half shaft to drive the hub to drive the wheel to rotate. The structure of the device is simple and compact, which is conducive to processing and assembling to reduce production costs, improves the rigidity of the electric drive axle and reduces the radial dimension, and has strong bearing capacity and impact resistance. It is suitable for use as a front axle and a rear axle, and is suitable for installation on Various vehicles, ships and machinery.

Description

Universal Electric Drive Axle

technical field

The utility model belongs to the technical field of electric drive, and relates to a universal electric drive axle for vehicles, ships, and machinery, in particular, it can be used as the front and rear axles of vehicles.

Background technique

The current layout modes of electric drive vehicle motors include in-wheel motor mode, wheel side motor mode, axle single motor built-in and external mode, and axle dual motor external mode. The hub motor mode increases the swing inertia and moment of inertia of the hub, which adds excessive axial swing load to the hub bearing. Once the bearing clearance is too large, it will cause the hub motor sealing problem, and the tolerance to dust and muddy water will become poor. Lead to failure; because the tire will rub against the hub to generate heat when walking, and heat dissipation is also the weakness of the hub motor. In the wheel side motor mode, the electric motor occupies the space inside the wheel hub, which makes the external structure of the axle complex, increases the unsprung mass, and deteriorates the passing capacity. The traditional differential gear is used in the built-in and external modes of the axle single motor, and the internal structure is complex, resulting in a weak vehicle load capacity and impact resistance, which is prone to mechanical failures; due to the high-power motors, bearing insulation issues need to be considered. Therefore, the design difficulty of the vehicle is increased, especially the offset of the center of gravity of the single-motor coaxial built-in model axle, which leads to inconsistent bearing capacity and unsprung mass on both sides of the hub. The various modes of external dual motors on the axle increase the radial size of the axle and the redundant shell structure, and the small number of meshing teeth of the gears leads to poor impact resistance, increases a large amount of unsprung mass, and makes the combined design of the axle The difficulty becomes greater and it is not suitable for use as a front axle.

Therefore, there is provided an electric drive axle with simple structure, convenient vehicle design, small radial dimension, strong bearing capacity, strong impact resistance, can be used as front and rear axles, suitable for load-carrying vehicles and passenger vehicles, and can also be used on ships and machinery It became very urgent and important.

Contents of the invention

In order to solve the above problems in the prior art, the utility model proposes a universal electric drive axle with simple structure, convenient design, good processing technology and good installation technology. The technical scheme of the utility model is as follows:

The universal electric drive axle includes a motor, a planetary reduction body, and a drive half shaft. The motor rotor shaft of the motor is connected to the planetary reducer in the planetary reducer, and the planetary reducer is connected to the drive half shaft. Wherein the motor, the planetary reduction body, and the transmission half shaft are coaxially connected; the planetary reduction body contains a symmetrical planetary reduction mechanism, and the planetary reduction mechanism includes a first-stage planetary reducer and a second-stage planetary reducer, wherein the motor rotor shaft is connected to the first-stage The planetary reducer is connected, the first-stage planetary reducer is connected with the second-stage planetary reducer, and the second-stage planetary reducer is connected with the transmission half shaft; the motor is used as the power input end, passing through the first-stage planetary reducer and the second-stage planetary reducer in turn The torque is transmitted to the transmission half shaft to drive the hub to drive the wheel to rotate.

The motor rotor shaft is the first-stage sun gear of the first-stage planetary reducer, and the first-stage planetary reducer also includes a first-stage planetary gear, a first-stage inner ring gear and a first-stage planet carrier, wherein the first-stage inner ring gear is fixed on the planetary On the reduction body, the first-stage planetary gear is connected with the first-stage planet carrier.

The first-stage planetary carrier is the second-stage sun gear of the second-stage planetary reducer, and the second-stage planetary reducer also includes a second-stage planetary gear, a second-stage inner ring gear and a second-stage planetary carrier, wherein the second-stage ring gear is fixed on the planetary On the reduction body, the secondary planetary gear is connected with the secondary planet carrier, and the secondary planet carrier is connected with the transmission half shaft.

Further, it also includes a composite casing formed by the fixed motor, the first-stage planetary reducer and the planetary reducer casing of the second-stage planetary reducer, the motor casing, and the half-shaft sleeve. The composite casing is the same Several shells of the shaft are combined and connected into a whole.

Further, the motor rotor shaft is a hollow structure, and the motor rotor shaft serves as the sun gear of the first-stage planetary reducer to transmit power to the first-stage planetary reducer and the second-stage planetary reducer, and the second-stage planetary reducer transmits power to the transmission half The transmission half shaft passes through the hollow secondary planetary reducer, the primary planetary reducer, the motor rotor shaft and the half shaft sleeve, and connects to one side of the hub to drive the wheel to rotate.

Advantage of the utility model and beneficial effect are as follows:

The utility model provides a universal electric drive axle, which provides an electric drive axle with simple structure, small radial size, convenient vehicle design, strong bearing capacity, strong impact resistance, can be used as front and rear axles, and is suitable for load-carrying vehicles and trailers. The universal electric drive axle is also suitable for use on passenger vehicles, ships and machinery. The general-purpose electric drive axle has few parts, good processing technology and assembly technology, and low failure rate. Some parts can be uniform in size, so that the design and manufacturing costs are greatly reduced, and the maintenance cost is also greatly reduced.

This universal electric drive axle has good expansion ability. In practical application, the universal electric drive axle can be connected with the car body by leaf springs and used as a rigid axle. The bridge body can also be connected with independent suspension and transmission shaft to make the car body become an independent suspension. The structure can also be equipped with air springs for load-carrying vehicles. The universal electric drive axle can also be used on the trailer, so that the trailer itself has the functions of driving force and auxiliary braking.

The power output end of the universal electric drive axle has a relatively large space, and the existing vehicle braking device, wheel side deceleration system and other wheel hub peripheral systems can be used, so that the overall design and manufacturing costs of the vehicle are greatly reduced, and the overall size of the vehicle can be maintained. The existing standards are consistent, and the maintenance cost is relatively low. At the same time, the universal electric drive axle adopts coaxial arrangement, which has the characteristics of compact structure, high rigidity, high transmission efficiency, large transmission torque and strong impact resistance.

The whole or half of the universal electric drive axle can also be used as a driving mechanism for ships and machinery.

Description of drawings

Fig. 1 is a schematic diagram of an embodiment of the universal electric drive axle provided by the utility model.

Detailed ways

The technical solutions in the embodiments of the present invention will be described clearly and in detail below in conjunction with the accompanying drawings of the embodiments of the present invention.

The technical scheme of the utility model is as follows:

As shown in Figure 1, the general electric drive axle includes motor A (1), motor B (2), planetary reduction body (3), transmission half shaft (7) and opposite transmission half shaft, motor A (1), motor B (2) is symmetrically and coaxially connected to both sides of the planetary reduction body (3).

In the embodiment, there are two sets of symmetrically arranged planetary reduction mechanisms inside the planetary reduction body (3), and the first-stage planetary reduction mechanism (4) in the planetary reduction mechanism is meshed with the motor rotor shaft (6) of the motor A (1). The motor rotor shaft of motor B(2), which is arranged symmetrically with motor A(1), is engaged with the gear of the first-stage planetary reducer on the same side.

In the embodiment, the casing of the planetary reduction body (3) used to fix the motor A (1) and the motor B (2) contains two sets of planetary reduction mechanisms arranged symmetrically.

The first-stage planetary reducer (4) in the embodiment includes a first-stage planetary gear, a first-stage ring gear and a first-stage planet carrier, wherein the first-stage ring gear is fixed on the planetary reduction body (3), and the motor rotor shaft (6) Axially fixed with the motor A (1) as the sun gear of the first-stage planetary reducer (4), the first-stage planetary gear is connected with the first-stage planetary carrier, and the first-stage planetary carrier is used as the second-stage sun of the second-stage planetary reducer (5) Wheel; the secondary planetary reducer (5) includes a secondary planetary gear, a secondary ring gear and a secondary planet carrier, wherein the secondary ring gear is fixed on the planetary reduction body (3), and the secondary planetary gear and The secondary planetary carrier is connected, and the secondary planetary carrier is connected with the transmission half shaft (7), and the opposite structure is the same as the above structure.

In the embodiment, motor A (1), motor B (2) and planetary reduction body (3) are connected at both ends of the housing as the end cover of the planetary reduction body (3) housing, and the housing of motor A (1) and the half shaft sleeve The tube (8) is connected by an interference fit, and the motor B (2) is connected by an interference fit with the half-shaft sleeve on the same side, jointly forming a coaxial integral combined shell structure.

In the embodiment, the motor rotor shafts of motor A (1) and motor B (2) are hollow structures, and the transmission half shaft (7) passes through the half shaft sleeve (8), the motor rotor shaft (6), and the first-stage planetary reducer ( 4) It is spline connected with the planet carrier of the secondary planetary reducer (5), and the power of the secondary planetary reducer (5) is transmitted to the transmission half shaft (7) to drive the wheel hub (9) to drive the wheels to rotate, and the opposite transmission half shaft The connection and the transmission mode are identical with the transmission half shaft (7).

The utility model realizes the change of the hub drive torque and rotating speed by changing the electrical parameters of the input motors, and realizes the wheel hub differential speed operation by inputting the different electrical parameters of the two motors.

Half of the structure in the embodiment can be used as a unilateral drive mechanism, which is also within the scope of the claims of the present utility model. The utility model can also realize a larger deceleration ratio and increase torque by increasing the number of stages of the planetary reducer, so that the actual product has a certain universal ability.

The above embodiments should be understood as only for illustrating the utility model but not for limiting the protection scope of the utility model. Equivalent changes and modifications formed by making various changes or modifications to the utility model after reading the description of the utility model are also included in the scope defined by the claims of the utility model.

Claims (7)

1. The universal electric drive axle is characterized in that it includes motor A (1), motor B (2), planetary reduction body (3), half shaft sleeve (8), driving hub (9), transmission half shaft (7 ) and opposite transmission half shafts; motor A (1) and motor B (2) are symmetrical and coaxially connected to both sides of the planetary reduction body (3), and the transmission half shaft (7) passes through the drive hub (9), the half shaft The bushing (8), motor A (1) and the planetary reduction body (3) are splined; all structural parts are coaxially connected, and while the motor is added inside the drive axle, there is no excessive drive axle compared to the external drive axle. Increase the radial dimension of the drive axle. 2. The universal electric drive axle according to claim 1, characterized in that, there are two sets of planetary reduction mechanisms arranged symmetrically inside the planetary reduction body (3), and the first-stage planetary reduction gear (4) in the planetary reduction mechanism and the motor A The motor rotor shaft (6) of (1) is meshed with the motor A (1), and the motor rotor shaft of motor B (2) symmetrically arranged with the motor A (1) is meshed with the gear of the first-stage planetary reducer on the same side. 3. The universal electric drive axle according to claim 1, characterized in that the primary planetary reducer (4) comprises a primary planetary gear, a primary ring gear and a primary planet carrier, wherein the primary ring gear is fixed on On the planetary reduction body (3), the motor rotor shaft (6) and the motor A (1) are fixed as the sun gear of the primary planetary reducer (4), the primary planetary gear is connected with the primary planet carrier, and the primary planet carrier acts as The secondary sun gear of the secondary planetary reducer (5); the secondary planetary reducer (5) includes a secondary planetary gear, a secondary ring gear and a secondary planet carrier, wherein the secondary ring gear is fixed on the planet On the reduction body (3), the secondary planetary gear is connected with the secondary planetary carrier, and the secondary planetary carrier is connected with the transmission half shaft (7), and the opposing structure is the same as the above structure. 4. The universal electric drive axle according to claim 1, characterized in that, it also includes a planetary reduction body (3) casing for fixing the motor A (1) and the motor B (2) and including a symmetrically arranged planetary reduction mechanism. 5. according to the described universal electric drive axle of claim 1, it is characterized in that, motor A (1), motor B (2) are connected with the two ends of planetary reduction body (3) casing as planetary reduction body (3) casing The end cover, motor A (1) casing and half shaft sleeve (8) are connected by interference fit, and motor B (2) is connected by interference fit with the half shaft sleeve on the same side, forming a coaxial integral composite shell structure . 6. according to the described universal electric drive axle of claim 1, it is characterized in that, the motor rotor shaft of described motor A (1), motor B (2) is a hollow structure, and the transmission half shaft (7) passes through the half shaft sleeve ( 8), the motor rotor shaft (6), the first-stage planetary reducer (4) and the planet carrier of the second-stage planetary reducer (5) are spline connected, and the power of the second-stage planetary reducer (5) is transmitted to the transmission half shaft ( 7) The driving wheel hub (9) drives the wheels to rotate, and the connection and transmission mode of the opposite transmission half shaft are the same as those of the transmission half shaft (7). 7. The universal electric drive axle according to any one of claims 1 to 6, characterized in that half of the structure can be used as a unilateral drive mechanism and is also within the scope of the claims.