CN214248187U

CN214248187U - Rack type electric power steering gear belt pulley fixing device

Info

Publication number: CN214248187U
Application number: CN202023073809.7U
Authority: CN
Inventors: 郭蕾
Original assignee: Tianjin Deke Intelligent Control Co ltd
Current assignee: Tianjin Deke Intelligent Control Co ltd
Priority date: 2020-12-19
Filing date: 2020-12-19
Publication date: 2021-09-21
Anticipated expiration: 2030-12-19

Abstract

The utility model relates to a rack-type electric power steering gear belt pulley fixing device. The belt pulley fixing device consists of a fixing sleeve, a deep groove ball bearing and an elastic retainer ring for holes. Motor rotor shaft mounting means is cantilever type structure, and the left end links to each other with the end cover through deep groove ball bearing, and the centre links to each other with motor casing through deep groove ball bearing, and the little pulley pressure equipment of right-hand member is on motor rotor shaft, and is unsupported. The utility model discloses fasten belt pulley fixing device on motor casing, the motor rotor shaft passes belt fixing device's deep groove ball bearing hole, supports, forces the motor rotor shaft of rightting simultaneously with three deep groove ball bearing, guarantees that the motor rotor shaft can not take place bending deformation because of the rigidity is not enough under the effect of tensioning force at the belt, leads to the belt tensioning force not enough, causes belt early wear or fracture, influences the life of product. The utility model has the characteristics of simple structure, simple to operate, the reliability is high, fixed effectual.

Description

Rack type electric power steering gear belt pulley fixing device

Technical Field

A belt pulley fixing device of a rack type electric power steering gear belongs to the field of automobile steering.

Background

The automobile electric power steering gear is a key part of an automobile steering system, and the integral structure, the stability and the reliability in work of the automobile electric power steering gear directly influence the performance of the whole automobile system. The rack type electric power steering gear is a power steering device which transfers torque and rotating speed by a ball screw pair, a belt transmission pair and a rack-and-pinion transmission pair, and has better hand feeling and power-assisted effect.

Present rack-type electric power steering gear, its structural drawback lies in: the product has compact structure, the belt transmission pair consists of a synchronous belt, a large belt pulley, a small belt pulley and a tension pulley, the center distance between the two belt pulleys is small, the purpose of transmitting force in a compact space is realized, and the circular arc tooth synchronous belt is usually selected as a transmission medium in the industry. Second, electric motor rotor axle mounting means is cantilever type structure, and left end and middle part are supported by the bearing, and belt lace wheel atress one side (right-hand member) do not have the support, and when the hold-in range tensioning, electric motor rotor axle produces electric motor rotor axle and lead to the unable tensioning of hold-in range and influence product property ability because rigidity is not enough.

Disclosure of Invention

In view of this, the utility model provides a simple structure, simple to operate, reliability are high, fixed effectual rack-type electric power steering gear belt pulley fixing device.

The rack type electric power steering gear has gear rack transmission at the input end and ball screw transmission at the power assisting end, wherein the rack and the screw are processed on the same shaft, and the screw is arranged at the right end of the rack at the left end. The rack-and-pinion pair transmits the torque and the rotating speed of the steering wheel, the sensor, the controller and the driving power-assisted motor operate, and the torque and the rotating speed provided by the motor are transmitted to the steering wheel through the belt transmission pair, the ball screw transmission pair and the rack-and-pinion transmission pair to realize power-assisted steering.

The technical scheme of the utility model is that: a belt pulley fixing device of a rack type electric power steering gear comprises a fixing sleeve, a deep groove ball bearing, a hole elastic retainer ring and the like. The pulley fixing device is fastened on the motor shell through 2 bolts. The motor rotor shaft passes through an inner hole of a deep groove ball bearing of the belt fixing device and is used for supporting and righting the motor rotor shaft.

The belt transmission pair consists of a large belt pulley, a small belt pulley, a synchronous belt and a tension pulley. The steering gear assisting end and the small belt pulley are pressed on the motor rotor shaft; the large belt pulley is pressed on the ball screw pair nut and is coaxial with the ball screw pair; the synchronous belt is arranged on the large belt pulley and the small belt pulley and is used for transmitting the torque and the rotating speed of the motor; the tensioning wheel is used for tensioning the synchronous belt.

The big belt pulley, the small belt pulley and the belt are all in arc tooth structures. Can transmit larger torque and rotating speed in a narrow space, and has high transmission efficiency.

The tensioning wheel consists of a tensioning wheel outer ring, a tensioning wheel shaft, a deep groove ball bearing, a hole elastic retainer ring and a shaft elastic retainer ring. The deep groove ball bearing is press-mounted on the outer ring of the tension wheel, the lower surface of the deep groove ball bearing is fixed by an elastic retainer ring through a hole, and the tension wheel shaft is press-mounted on the inner hole of the deep groove ball bearing and is fixed by the elastic retainer ring through a shaft. The tensioning wheel shaft and the tensioning wheel outer ring can rotate relatively under the action of the bearing.

The tensioning wheel shaft is an eccentric shaft, namely a bolt hole for fixing the tensioning wheel on the motor shell is eccentric to the central axis of the tensioning wheel shaft, and the tensioning wheel shaft has the function that in the tensioning process of a belt, the tensioning wheel rotates to generate angle change, so that the tension of the belt is increased and decreased, and the tension is adjusted.

In the assembling process, along with the continuous increase of the tension force, the motor rotor shaft can generate bending deformation due to the cantilever beam structure of the motor rotor shaft, and the larger the tension force is, the larger the bending deformation is. The utility model aims at preventing that electric motor rotor axle bending deformation is too big, leading to the belt tensile force not enough, causing belt early wear or fracture, influencing the life of product. The utility model has the advantages that: the belt pulley fixing device is simple in structure, convenient to install, high in reliability and good in fixing effect.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic illustration of the installation of the belt drive pair.

Fig. 3 is a schematic view of the present invention mounted on a power steering gear.

Figure 4 is a schematic view of a tensioner configuration.

Wherein: 1-fixing sleeve, 2-elastic retainer ring for hole, 3-deep groove ball bearing, 4-bolt, 5-motor shell, 6-motor rotor shaft, 7-large belt pulley, 8-small belt pulley, 9-tensioning wheel shaft, 10-elastic retainer ring for shaft, 11-deep groove ball bearing, 12-elastic retainer ring for hole, 13-tensioning wheel outer ring, 14-belt, 15-tensioning wheel and 16-screw.

Detailed Description

As shown in fig. 1, 2, 3 and 4, a pulley fixing device for a rack-and-pinion power steering gear is characterized in that: the device comprises a fixed sleeve 1, a deep groove ball bearing 3, a hole elastic retainer ring 2 and the like. The pulley fixing means is fastened to the motor housing 5 by 2 bolts 4. The motor rotor shaft 6 penetrates through an inner hole of the deep groove ball bearing 3 of the belt fixing device and is used for supporting and righting the motor rotor shaft 6. The belt transmission pair consists of a large belt pulley 7, a small belt pulley 8, a belt 14 and a tension pulley 15. The small belt pulley 8 is pressed on the motor rotor shaft 6 at the power assisting end of the steering gear; the large belt pulley 7 is pressed on the ball screw pair nut and is coaxial with the ball screw pair; the belt 14 is arranged on the large belt pulley 7 and the small belt pulley 8 and is used for transmitting the torque and the rotating speed of the motor; the tensioner 15 is used to tension the belt 14. The large belt pulley 7, the small belt pulley 8 and the belt 14 are all in circular arc tooth structures. And the tensioning wheel 15 consists of a tensioning wheel outer ring 13, a tensioning wheel shaft 9, a deep groove ball bearing 11, a hole elastic retainer ring 12 and a shaft elastic retainer ring 10. The deep groove ball bearing 11 is pressed on the outer ring 13 of the tensioning wheel, the lower surface of the deep groove ball bearing is fixed by an elastic retainer ring 12, and the tensioning wheel shaft 9 is pressed on the inner hole of the deep groove ball bearing 11 and is fixed by the elastic retainer ring 12. The tensioning wheel shaft 9 and the tensioning wheel outer ring 13 can rotate relatively under the action of the deep groove ball bearing 11. The tensioning wheel shaft 9 is an eccentric shaft, namely a bolt hole for fixing the tensioning wheel 15 on the motor housing 6 is eccentric to the central axis of the tensioning wheel shaft 9, and the tensioning wheel shaft has the function that in the tensioning process of the belt 14, the tensioning wheel 15 rotates to generate angle change, so that the tensioning force of the belt 14 is increased and decreased, and the tensioning force is adjusted.

Claims

1. The utility model provides a rack-type electric power steering gear belt pulley fixing device which characterized in that: the device consists of a fixed sleeve, a deep groove ball bearing, an elastic retainer ring for holes and the like; the belt pulley fixing device is fastened on the motor shell through 2 bolts; the motor rotor shaft passes through an inner hole of a deep groove ball bearing of the belt fixing device and is used for supporting and righting the motor rotor shaft.