CN104890504A - Integral speed reduction type electric wheel driving system for trapezoidal linkage type independent suspension - Google Patents

Abstract

The invention provides an integral speed reduction type electric wheel driving system for a trapezoidal linkage type independent suspension. A motor shell, a primary reduction gearbox shell and an H-shaped swing arm of the trapezoidal linkage type independent suspension are integrated, and a secondary reduction gearbox shell and a steering knuckle are integrated. Since a motor is elastically hinged away from the center of a wheel and close to the H-shaped swing arm, vibration of the motor is lower than that of a vehicle body in a wheel hopping process, and the integral speed reduction type electric wheel driving system has the advantages of high integration level, low equivalent unsprung mass and excellent suspension kinematic performance.

Description

An integrated trapezoidal link type independent suspension deceleration wheel side electric drive system

technical field

The invention belongs to the field of electric vehicle chassis and transmission, in particular to an integrated trapezoidal link type independent suspension deceleration wheel side electric drive system.

Background technique

The wheel side electric drive system introduces the driving motor into the wheel side/wheel, and its main structural feature is that the driving motor is installed in or near the driving wheel, which has the advantages of short drive transmission chain, efficient transmission, and compact structure. According to different road surface feedback information and driving conditions, the torque of each driving wheel is independently controlled by the wheel side motor, realizing a high-performance control function.

The traditional wheel-side electric drive system introduces a drive motor into the wheel/wheel, which increases the unsprung mass and adversely affects the grounding of the wheel and ride comfort, that is, the negative effect of the unsprung mass.

In recent years, the trapezoidal link independent suspension has been widely used in the front and rear suspensions of luxury cars because of its superior suspension kinematics performance. Combining the superior performance of the trapezoidal link independent suspension, the present invention proposes an integrated trapezoidal link independent suspension deceleration wheel side electric drive system, which improves the unsprung mass negative effect of the traditional wheel side electric drive system and can be used for in the rear suspension of the car.

Contents of the invention

The invention proposes an integrated trapezoidal link type independent suspension deceleration wheel side electric drive system. It integrates the motor casing and the first-stage reduction box casing with the H-shaped swing arm of the trapezoidal link type independent suspension, and integrates the second-stage reduction box casing and the steering knuckle. Since the motor deviates from the center of the wheel and is arranged close to the elastic hinge connecting the H-shaped swing arm and the frame, the vibration of the motor relative to the vehicle body is reduced during the wheel jumping process, and the equivalent unsprung mass is reduced, which improves the grounding of the wheel and the driving stability Ride comfort, high level of integration.

Technical scheme of the present invention is:

Integrated trapezoidal link type independent suspension deceleration wheel-side electric drive system, including frame, integrated first-stage reducer-motor housing-H-shaped swing arm assembly, integrated second-stage reducer-steering Joint assembly, upper swing arm, hub bearing, motor, elastic hinge, ball hinge, etc.

The power of the motor is decelerated in two stages to the output of the half shaft of the wheel. The motor housing is integrated with the first-stage reduction box. One end of the motor is supported on the frame through an elastic hinge and can rotate around the elastic hinge, thus acting as a trapezoidal link suspension. The function of the H-shaped swing arm of the rack. The second-stage reduction box is integrated with the steering knuckle (guide knuckle), the second-stage input gear and the first-stage output gear are connected to the second shaft by means of splines, and the second shaft acts as a link between the H-shaped swing arm and the steering knuckle. The role of the rotating hinge between. The upper end of the second-stage gearbox-steering knuckle assembly is connected with the upper swing arm by a ball joint, and the other end of the upper swing arm is connected with the vehicle frame by a ball joint. The hub bearing is composed of the inner ring of the hub bearing and the outer ring of the hub bearing. The hub (the inner ring of the hub bearing) can and can only rotate around the central axis of the hub bearing relative to the outer ring of the hub bearing. The outer ring of the wheel hub bearing is firmly connected to the gearbox housing on the integrated second-stage gearbox-steering knuckle assembly, and the inner ring of the bearing is firmly connected to the second-stage output shaft (half shaft), wheel rim, and brake rotating parts.

The power output shaft of the motor acts as the first shaft of the reduction box and is connected with the first-stage input gear. The motor speed is decelerated by the first and second-stage reduction boxes and the power of the motor is transmitted to the power output shaft of the second-stage reduction box. The third-generation bearing inner ring and rim drive the wheel.

Compared with prior art, the present invention is characterized in that:

(1) Combining the advantages of the trapezoidal link independent suspension and the integrated wheel drive system, the suspension kinematics performance of the integrated trapezoidal link independent suspension deceleration wheel drive system is superior, such as the wheel The camber angle and toe angle are stable during the beating process;

(2) The motor housing is integrated with the first-stage gearbox and acts as an H-shaped swing arm, and the second-stage gearbox acts as a steering knuckle (guiding knuckle), with a high degree of integration;

(3) The two-stage gearbox is used to decelerate and increase torque, which can match the motor with higher power density and smaller volume and mass, so the moment of inertia of the elastic hinge connecting the motor around the H-shaped swing arm and the body is small, and the center of mass of the motor is close to the H-shaped The elastic hinge connecting the swing arm and the frame, so the vibration amplitude of the motor relative to the body is small, which suppresses the negative effect of the unsprung mass;

(4) According to the difference between the angle between the second shaft of the gearbox and the axis of the wheel, the second-stage gearbox can adopt many transmission forms such as worm gear transmission, cross-axis helical gear transmission, parallel shaft gear transmission, etc.;

(5) When the vehicle turns, the motor does not steer with the wheels. Therefore, compared with the traditional electric drive system in which the motor and reducer are arranged in the wheel/side of the wheel, the steering inertia moment of the present invention is smaller and the steering response is more sensitive.

Description of drawings

Fig. 1 is a schematic structural view of the integrated trapezoidal link type independent suspension deceleration wheel side electric drive system of the present invention.

Explanation of the symbols in the accompanying drawings:

1, 1’, 1’ ’——frame;

2——Integrated first-stage gearbox-motor housing-H-type swing arm assembly;

201——motor housing; 202——first-stage gearbox housing;

3——Integrated second-stage gearbox-steering knuckle assembly;

301——Second-stage gearbox housing;

4—upper swing arm;

5 - hub bearing;

501——outer ring of hub bearing; 502——inner ring of hub bearing;

I——the first elastic hinge; II——the second elastic hinge;

III——the first spherical joint; IV——the second spherical joint;

a——the axis of the third shaft (power output shaft) of the gearbox;

b——the axis of the second shaft of the gearbox;

c——Axis of the first shaft of the gearbox (motor output shaft).

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing 1.

Integrated trapezoidal link type independent suspension deceleration wheel-side electric drive system, including frame 1, integrated first-stage reducer-motor housing-H-shaped swing arm assembly 2, integrated second-stage reducer -Steering knuckle assembly 3, upper swing arm 4, hub bearing 5, first elastic hinge I, second elastic hinge II, first ball joint III, second ball joint IV, etc., motor housing 201 and the first stage The reduction box housing 202 is a part of the integrated first-stage reduction box-motor housing-H-type swing arm assembly 2, and serves as the H-type swing arm function of the trapezoidal link type independent suspension. The motor housing 201 is supported on the vehicle frame 1', 1'' through the first elastic hinge I and the second elastic hinge II. The central axes of the first elastic hinge I and the second elastic hinge II coincide to form an H-shaped swing arm and Hinged swing axis between frame 1', 1' '. The second-stage gearbox housing 301 is a part of the integrated second-stage gearbox-steering knuckle assembly 3 and serves as a steering knuckle (guide knuckle). The first-stage gearbox casing 202 and the second-stage gearbox casing 301 are connected by the second shaft of the gearbox (at the axis b of the second shaft of the gearbox in the schematic diagram), and can only rotate relatively around the second axis of the gearbox. The gearbox second shaft thus functions as a revolute joint connecting the H-shaped swing arm to the steering knuckle. The second-stage gearbox housing 301 is connected to the upper swing arm 4 through the first spherical joint III, and the upper swing arm 4 is connected to the vehicle frame 1 through the second spherical joint IV. The hub bearing 5 is composed of a hub bearing inner ring 502 and a hub bearing outer ring 501. Compared with the hub bearing outer ring 501, the hub bearing inner ring 502 can and can only rotate around the axis a of the third shaft (power output shaft) of the gearbox. The hub bearing outer ring 501 is fixedly connected with the second-stage gearbox casing 301, and the hub bearing inner ring 502 is fixedly connected with the gearbox power output shaft, wheel rim and brake rotating part.

The power output shaft of the motor (at the axis c of the first shaft of the reduction box in the schematic diagram) serves as the first shaft of the reduction box (not shown in the figure), and is connected with the input gear in the first-stage reduction box housing 202 (not shown in the figure) (shown) are connected in the form of splines, etc., and the power is transmitted to the second shaft through a pair of parallel-shaft fixed-axis gears in the first-stage reduction box housing 202 (at the axis b of the second shaft of the reduction box in the schematic diagram). The input gear (not shown in the figure) in the second-stage reduction box housing 301 is fixedly connected with the second shaft of the reduction box, and the final motor power passes through a pair of cross-axis helical gears in the second-stage reduction box housing 301 (figure (not shown in the figure) is transmitted to the power output shaft of the gearbox (at the axis a of the third axis of the gearbox in the schematic diagram) and the inner ring of the wheel hub bearing that is firmly connected with the power output shaft, thereby driving the wheels.

The axis c of the first shaft of the reduction box is parallel to the axis b of the second shaft of the reduction box, so the first stage of reduction can be realized by using parallel shaft fixed shaft gears. The axis b of the second shaft of the gearbox and the axis a of the power output shaft form a certain angle , according to the size of the angle, the second stage of deceleration can use parallel shaft fixed shaft gear ( ), cross-axis helical gear ( ) or worm gear ( )accomplish.

Claims (5)

1. Integrated trapezoidal link type independent suspension deceleration wheel-side electric drive system, characterized in that: the motor housing and the first-stage gearbox housing are integrated first-stage gearbox-motor housing-H A part of the swing arm assembly, which acts as the H-type swing arm function of the trapezoidal link independent suspension; the motor housing is supported on the frame by two elastic hinges, and the central axes of the two elastic hinges overlap to form an H-type swing arm. The hinged swing axis between the arm and the frame; the second-stage gearbox housing is part of the integrated second-stage gearbox-steering knuckle assembly and acts as a steering knuckle; the first-stage gearbox housing and the second-stage gearbox The two-stage gearbox housing is connected with the second shaft of the gearbox, and the second shaft of the gearbox acts as a rotating hinge connecting the H-shaped swing arm with the steering knuckle; the upper end of the integrated second-stage gearbox-steering knuckle assembly passes through The ball joint is connected with the upper swing arm, and the upper swing arm is connected with the frame through the ball joint; the outer ring of the hub bearing is connected with the shell of the second-stage gearbox, and the inner ring of the hub bearing is connected with the power output shaft of the gearbox, the wheel rim and the rotating part of the brake. Fixed connection. 2. The integrated trapezoidal link type independent suspension deceleration wheel-side electric drive system according to claim 1, characterized in that: the power output shaft of the motor acts as the first shaft of the reduction box, and is connected with the first-stage reduction box The input gear in the motor is connected in the form of splines, etc., and the power is transmitted to the second shaft through a pair of parallel-shaft fixed-axis gears in the first-stage reduction box. The input gear in the second-stage reduction box is connected to the second shaft of the reduction box. The final motor power is transmitted to the power output shaft of the gearbox and the inner ring of the third-generation wheel hub bearing that is fixedly connected with the power output shaft through a pair of cross-axis helical gears in the second-stage reducer, so that the drive is fixedly connected with the inner ring of the wheel hub bearing wheel. 3. The integrated trapezoidal link type independent suspension deceleration wheel-side electric drive system according to claim 2, characterized in that: the pair of cross-axis helical gears can also be parallel-axis fixed-axis gears or worm gears . 4. The integrated trapezoidal link type independent suspension deceleration wheel-side electric drive system according to claim 1, characterized in that: the axis of the first axis of the gear box is parallel to the axis of the second axis of the gear box, so the first stage of deceleration It can be realized by using parallel shaft fixed shaft gears. 5. The integrated trapezoidal link type independent suspension deceleration wheel-side electric drive system according to claim 1, characterized in that: the axis of the second shaft of the reduction box and the axis of the power output shaft form a certain angle , according to the size of the included angle, the second stage deceleration can be adopted: when , parallel shaft fixed shaft gear; or, when , the cross-axis helical gear; or, when , the worm gear is realized.