CN110962582A

CN110962582A - Distributed driving independent suspension wheel edge motor assembly

Info

Publication number: CN110962582A
Application number: CN201811135778.8A
Authority: CN
Inventors: 曾洋洋; 龚炫; 陈选楠; 胡胜利; 邵庆刚; 卢金良
Original assignee: Dongfeng Dana Axle Co Ltd
Current assignee: Dongfeng Dana Axle Co Ltd
Priority date: 2018-09-28
Filing date: 2018-09-28
Publication date: 2020-04-07

Abstract

A distributed driving independent suspension wheel-side motor assembly is mainly used for manufacturing pure electric vehicles. The axle assembly adopts a disconnected structure, and the suspension frames on the left side and the right side are connected with the frame through rubber ball hinge structures, so that the motion independence of the left wheel end and the right wheel end is realized; the outer ends of the left and right tie rods are connected with a steering knuckle, the inner ends of the left and right tie rods are connected with a conversion arm, a steering system is of a disconnected three-section type steering trapezoid structure, the conversion arm is connected with a frame in a revolute pair mode, the conversion arm is simultaneously connected with the left and right tie rods, the middle tie rod and a steering drag link, and two ends of a transverse stabilizer bar are respectively connected with a left lower A-shaped arm and a right lower A-shaped arm; the motor is directly connected with the steering knuckle and fixedly arranged on the inner side of the steering knuckle, and power is output through a rotor of the motor to directly drive the wheel end half shaft to rotate. The invention has compact structural arrangement, simplifies the system, shortens the transmission chain, improves the transmission efficiency, can greatly reduce the unsprung mass, achieves the aim of light weight and improves the operating stability and smoothness of the vehicle.

Description

Distributed driving independent suspension wheel edge motor assembly

Technical Field

The invention relates to the technical field of automobile manufacturing, in particular to a distributed driving independent suspension wheel-side motor assembly.

Background

In recent years, in the technical field of electric automobiles, wheel-side motor driving methods have attracted much attention, in which a driving motor is integrated into a wheel, unlike a driving method of a conventional mechanical transmission vehicle, a vehicle driven by a wheel-side motor generates electric power by a battery or a generator set, and the electric power is transmitted to a wheel-side motor device located in the wheel for direct driving, and the wheel-side motors are generally symmetrically arranged and equal in number from left to right. The symmetrical arrangement can realize the stability control of the automobile and the coordination control between the dynamics of the whole automobile by distributing the longitudinal force of the two driving wheels, so that the performance of the automobile is optimal. For vehicles requiring high maneuverability, an independent suspension is generally adopted, the suspension stroke is large, the axial size of a wheel driving device cannot be overlong, and the suspension is prevented from interfering with a steering mechanism. Meanwhile, for the vehicle, the smaller the unsprung mass is, the better the ride comfort of the vehicle is, and the better the response characteristics and the handling of the suspension are.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a wheel-side motor assembly of an independent suspension with distributed driving, which can realize light weight of the assembly weight and improve the operation stability and smoothness of a vehicle.

In order to achieve the purpose, the axle assembly adopts a disconnected structure, and the suspensions on the left side and the right side are connected with the frame through rubber ball hinge structures, so that the motion independence of the left wheel end and the right wheel end is realized; the outer ends of the left and right tie rods are connected with a steering knuckle, the inner ends of the left and right tie rods are connected with a conversion arm, a steering system is of a disconnected three-section type steering trapezoid structure, the conversion arm is connected with a frame in a revolute pair mode, the conversion arm is simultaneously connected with the left and right tie rods, the middle tie rod and a steering drag link, and two ends of a transverse stabilizer bar are respectively connected with a left lower A-shaped arm and a right lower A-shaped arm; the motor is directly connected with the steering knuckle and fixedly arranged on the inner side of the steering knuckle, and power is output through a rotor of the motor to directly drive the wheel end half shaft to rotate.

The frame is provided with an upper A-shaped arm and a lower A-shaped arm, and the upper A-shaped arm and the lower A-shaped arm are connected with the steering knuckle by adopting a ball head; the air spring is arranged on the upper A-shaped arm and can swing up and down along with the upper A-shaped arm; the shock absorber is arranged on the lower A-shaped arm; the mounting surface of the motor is attached to the flange surface on the inner side of the steering knuckle and is fastened by bolts, the motor and the wheel hub are coaxially arranged, the output shaft of the motor penetrates through the steering knuckle and is connected with the half shaft by a spline, the outer side of the steering knuckle is provided with a mounting spigot of a shaft tube, the steering knuckle and the motor are fastened by bolts, an inner bearing and an outer bearing are mounted on the shaft tube, the outer rings of the inner bearing and the outer bearing are matched with the wheel hub, and the inner ring is matched with the shaft; the half shaft penetrates through the shaft tube, the half shaft is not in contact with the shaft tube, the large end of the half shaft is fastened with the end face of the hub by bolts, a brake disc is arranged outside the hub, and the brake caliper is arranged on a steering knuckle; power is output by the motor output shaft, is transmitted to the half shaft, and is rotated by the half shaft to drive the wheel hub to rotate, so that the power transmission is realized.

And rubber bushings are arranged at the joints of the upper A-shaped arm, the lower A-shaped arm and the frame.

The motors are arranged at the left wheel end and the right wheel end respectively and are symmetrically arranged, and the whole assembly is driven by adopting distributed control.

The conversion arm can rotate around the rotation center hole, a left tie rod interface and a right tie rod interface of the conversion arm are connected with the left tie rod and the right tie rod, the middle tie rod interface is connected with the middle tie rod, and the steering tie rod interface is connected with the steering tie rod.

Compared with the prior art, the invention cancels the traditional transmission shaft gearbox structure, integrates the motors at the wheel edge, symmetrically arranges the left wheel motor and the right wheel motor, and combines a double-cross arm independent suspension to form a distributed driving single suspension wheel edge motor assembly. The axle assembly has compact structural arrangement, simplifies the system, shortens the transmission chain, improves the transmission efficiency, can greatly reduce the unsprung mass because the suspension adopts a double-cross-arm independent suspension structure, achieves the aim of light weight, and simultaneously improves the operating stability and smoothness of the vehicle.

Drawings

FIG. 1 is a schematic diagram of the present invention.

Fig. 2 is a front view of fig. 1.

Fig. 3 is a cross-sectional view of the wheel end of fig. 1.

Fig. 4 is a connection structure diagram of the transition arm, the tie rod, and the intermediate tie rod of fig. 1.

In the figure: 1-vehicle frame, 2-upper A-type arm, 3-lower A-type arm, 4-motor, 5-wheel end, 6-air spring, 7-knuckle, 8-tie rod, 9-shock absorber, 10-motor output shaft, 11-axle tube, 12-half shaft, 13-brake disc, 14-wheel hub, 15-rubber bush, 16-outer bearing, 17-inner bearing, 18-brake caliper, 19-conversion arm, 20-middle tie rod, 21-transverse stabilizer bar, 22-rotation center hole, 23-steering drag link interface, 24-middle tie rod interface, 25-left and right tie rod interface.

Detailed Description

As shown in fig. 1, 2, 3 and 4, the axle assembly of the present invention adopts a disconnected structure, and the suspensions on the left and right sides are connected with the frame 1 through rubber ball joints, so as to realize the independence of the movement of the left and right wheel ends; the outer ends of the left and right tie rods 8 are connected with the steering knuckle 7, the inner ends are connected with the conversion arm 19, the steering system is of a disconnected three-section steering trapezoid structure, the left steering knuckle 7, the left tie rod 8 and the left conversion arm 19 are first sections, the middle tie rod 20 and the left and right conversion arms 19 are second sections, the right steering knuckle 7, the right tie rod 8 and the right conversion arm 19 are third sections, and each section is a double-rocker mechanism. The conversion arm 19 is connected with the frame 1 in a revolute pair mode, the conversion arm 19 is simultaneously connected with the left and right tie rods 8, the middle tie rod 20 and the steering drag link, and two ends of the stabilizer bar 21 are respectively connected with the left and right lower A-shaped arms 3; power is output by the motor output shaft 10, and the half shaft 12 directly drives the hub 14 to rotate, so that power transmission is realized, a power transmission chain is short, and transmission efficiency is high.

The frame 1 provides an installation interface for the whole assembly, the frame 1 is provided with interfaces of an upper A-shaped arm 2 and a lower A-shaped arm 3, rubber bushings 15 are arranged at the joints of the upper A-shaped arm 2 and the lower A-shaped arm 3 with the frame 1, the upper A-shaped arm 2 and the lower A-shaped arm 3 are connected with a steering knuckle 7 through ball heads, and the steering knuckle 7 can rotate around a ball center within a certain range; the lower mounting point of the air spring 6 is arranged on the upper A-shaped arm 2 and can swing up and down along with the upper A-shaped arm 2; the lower mounting point of the shock absorber 9 is on the lower a-arm 3; the mounting surface of the motor 4 is attached to the flange surface on the inner side of the steering knuckle 7 and is fastened by bolts, the motor 4 and the wheel hub 14 are coaxially arranged, the motor output shaft 10 passes through the steering knuckle 7 and is connected with the half shaft 12 by splines, the outer side of the steering knuckle 7 is provided with a mounting spigot of the shaft tube 11, the steering knuckle 7 and the motor 4 are fastened by bolts, the steering knuckle 7 and the steering knuckle arm are integrated, namely the steering knuckle 7 is provided with joint mounting holes of a left transverse pull rod and a right transverse pull rod 8, and the structure can reduce the total mass of the system; an inner bearing 16 and an outer bearing 17 are arranged on the shaft tube 11, the outer rings of the inner bearing 16 and the outer bearing 17 are matched with the hub 14, and the inner ring is matched with the shaft tube 11; the half shaft 12 penetrates through the shaft tube 11, the half shaft 12 is not in contact with the shaft tube 11, the large end of the half shaft 12 is fastened with the end face of a hub by bolts, a brake disc 13 is arranged outside the hub 14, and a brake caliper 18 is arranged on the steering knuckle 7; the motors 4 are symmetrically arranged at the inner sides of the left and right steering knuckles 7, the driving of the whole assembly adopts distributed control, the motors 4 are three asynchronous motors, and the functions of speed reduction and differential speed are realized by adjusting and distributing the driving force and the rotating speed of different driving wheels in the longitudinal direction.

The switching arm 19 can rotate around a rotating center hole 22, a left tie rod interface 25 and a right tie rod interface 25 of the switching arm are connected with the left tie rod 8 and the right tie rod 8, a middle tie rod interface 24 of the switching arm is connected with the middle tie rod 20, and a steering tie rod interface 23 of the switching arm is connected with a steering tie rod (an output end of a steering engine). The steering engine drives the conversion arm 19 to rotate through the steering drag link, and the conversion arm 19 drives the wheel end 5 to rotate through the left and right tie rods 8 and the middle tie rod 20, so that the left and right wheels rotate to meet the Ackerman rotation angle relationship, and the steering engine can be applied to a steering axle. The transverse stabilizer bar 21 is used for adjusting the roll angle rigidity of the suspension and achieving the purpose of improving the performance of the whole vehicle. The steering system is of a disconnected three-section type steering trapezoid structure, and the spatial positions of a rotating center hole 22, a steering straight pull rod connector 23, a middle tie rod connector 24 and left and right tie rod connectors 25 can be optimized according to different vehicle types, so that the optimal corner relation is realized.

The invention integrates the functions of the traditional mechanical axle, the motor and the independent suspension and replaces the traditional mechanical axle, the motor and the independent suspension structurally and functionally. The automobile suspension frame is driven by a pure electric motor, the excellent characteristics of an independent suspension frame are inherited, and wheels on two sides jump vertically and are independent of each other, so that the impact on the whole automobile body is reduced, and the comfort is greatly improved. In addition, the rubber bushing 15 is adopted, the up-and-down jumping of the upper A-shaped arm 2 and the lower A-shaped arm 3 can be met, and the nonlinearity of the rigidity in all directions greatly improves the rigidity of the suspension, so that the performance of the whole vehicle is improved.

Claims

1. The utility model provides a distributed drive's independent suspension wheel limit motor assembly which characterized in that: the axle assembly adopts a disconnected structure, and the suspension frames on the left side and the right side are connected with the frame (1) through a rubber ball hinge structure, so that the independent movement of the left wheel end and the right wheel end is realized; the outer ends of the left and right tie rods (8) are connected with a steering knuckle (7), the inner ends of the left and right tie rods are connected with a conversion arm (19), a steering system is of a disconnected three-section steering trapezoid structure, the conversion arm (19) is connected with the frame (1) in a revolute pair manner, the conversion arm (19) is simultaneously connected with the left and right tie rods (8), the middle tie rod (20) and a steering drag link, and two ends of a stabilizer bar (21) are respectively connected with the left and right lower A-shaped arms (3); the motor (4) is directly connected with the steering knuckle (7) and fixedly arranged on the inner side of the steering knuckle (7), and power is output through a rotor of the motor (4) to directly drive the wheel end half shaft (12) to rotate.

2. A distributed drive independent suspension wheel-side motor assembly as claimed in claim 1, wherein: the frame (1) is provided with interfaces of an upper A-shaped arm (2) and a lower A-shaped arm (3), and the upper A-shaped arm (2) and the lower A-shaped arm (3) are connected with a steering knuckle (7) by adopting a ball head; the air spring (6) is arranged on the upper A-shaped arm (2) and can swing up and down along with the upper A-shaped arm (2); the shock absorber (9) is arranged on the lower A-shaped arm (3); the mounting surface of the motor (4) is attached to the flange surface on the inner side of the steering knuckle (7) and fastened by bolts, the motor (4) and the wheel hub (14) are coaxially arranged, the motor output shaft (10) penetrates through the steering knuckle (7) and is connected with the half shaft (12) by a spline, the outer side of the steering knuckle (7) is provided with a mounting spigot of a shaft tube (11), the steering knuckle (7) and the motor (4) are fastened by bolts, the shaft tube (11) is provided with an inner bearing (16) and an outer bearing (17), the outer rings of the inner bearing (16) and the outer bearing (17) are matched with the wheel hub (14), and the inner ring is matched with the shaft tube (11); the half shaft (12) penetrates through the shaft tube (11), the half shaft (12) is not in contact with the shaft tube (11), the large end of the half shaft (12) is fastened with the end face of the hub by bolts, a brake disc (13) is installed outside the hub (14), and a brake caliper (18) is installed on the steering knuckle (7); power is output by the motor output shaft (10), is transmitted to the half shaft (12), and is rotated by the half shaft (12) to drive the hub (14) to rotate, so that the power transmission is realized.

3. A distributed drive independent suspension wheel-side motor assembly as claimed in claim 1, wherein: and rubber bushings (15) are arranged at the joints of the upper A-shaped arm (2), the lower A-shaped arm (3) and the frame (1).

4. A distributed drive independent suspension wheel-side motor assembly as claimed in claim 1, wherein: the motors (4) are respectively arranged at the left wheel end (5) and the right wheel end (5) and are symmetrically arranged, and the driving of the whole assembly adopts distributed control.

5. A distributed drive independent suspension wheel-side motor assembly as claimed in claim 1, wherein: the conversion arm (19) can rotate around the rotation center hole (22), a left tie rod interface (25) and a right tie rod interface (25) of the conversion arm (19) are connected with a left tie rod (8) and a right tie rod (8), a middle tie rod interface (24) is connected with a middle tie rod (20), and a steering tie rod interface (23) is connected with a steering tie rod.