CN214823581U

CN214823581U - EPS stroke end buffering structure

Info

Publication number: CN214823581U
Application number: CN202023092088.4U
Authority: CN
Inventors: 王正成; 王进丁; 刘新明; 陈修华; 胡立靖; 许咏翔
Original assignee: Changhui Automobile Steering System Huangshan Co ltd
Current assignee: Changhui Automobile Steering System Huangshan Co ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-11-23
Anticipated expiration: 2030-12-21

Abstract

An EPS stroke tail end buffering structure comprises a steering gear shell, wherein a rack is arranged in the steering gear shell, the tail end of the rack is fixedly connected with an inner tie rod ball socket, a damping washer matched with a limiting surface of the inner tie rod ball socket is arranged in a concave table of the steering gear shell, and the inner diameter of the damping washer is matched with the tail end of the rack and the outer diameter of the inner tie rod ball socket; the shock absorption washer is provided with a plurality of waist-shaped grooves which are uniformly distributed around the circle center; one end of the shock absorption gasket is limited in the steering gear shell through a steel wire retainer ring; the material of the shock absorption gasket is PPA-GF33 plastic. The utility model discloses traditional electric power steering system has been solved to the structure when steering wheel rotates extreme position, can cause great abnormal sound and steering wheel resilience, influences the driving comfort level and has certain dangerous problem.

Description

EPS stroke end buffering structure

Technical Field

The utility model relates to an auto electric power assisted steering system technical field especially relates to an EPS stroke end buffer structure.

Background

With the wider application of Electric Power Steering (EPS) products to automobiles, the driving feeling and the comfort brought to the steering system by people are higher and higher. The electric power steering system has the working principle that a steering wheel is connected with an input shaft of a steering gear through an intermediate shaft, when the steering wheel rotates, a sensor detects a torque signal and an angle signal of a torsion bar, the torque signal and the angle signal are converted into a current signal to be output to an EPS controller, and then a motor is controlled to work, and a gear shaft is further driven to rotate; the gear shaft drives the tire to rotate through meshing motion with the rack, and steering of the wheel is achieved.

When the steering wheel rotates to the limit position, namely when the wheels rotate to the maximum angle, the ball head seat of the inner tie rod connected with the rack collides with the limit structure in the shell of the steering gear, so that great abnormal sound is caused, the steering wheel rebounds, a driver feels uncomfortable, and certain dangerousness is caused under certain driving environments. Although when the steering wheel is about to rotate to the limit position, the rotating speed and the output torque of the motor can be adjusted within a certain angle range by controlling the motor through the controller, so that the boosting characteristic output by the system is changed, and the steering wheel is gradually driven to the limit position, the requirement on the controller is high in the mode, the program of the controller is extremely complex, the realization accuracy is difficult, and the cost performance of the product cannot be integrally guaranteed. Therefore, it is important to invent an EPS stroke end buffer structure.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a terminal buffer structure of EPS stroke solves traditional electric power assisted steering system and when steering wheel rotated extreme position, can cause great abnormal sound and steering wheel resilience, influences the driving comfort level and has certain dangerous problem.

The utility model provides a technical scheme that its technical problem adopted is:

the utility model provides a terminal buffer structure of EPS stroke, includes the steering gear casing, the steering gear casing in be provided with the rack, the end and the interior pull rod bulb seat fixed connection of rack, be provided with the shock attenuation packing ring of the spacing face of adaptation interior pull rod bulb seat in the concave station of steering gear casing, the external diameter of the internal diameter adaptation rack end and interior pull rod bulb seat of shock attenuation packing ring.

Furthermore, in order to ensure that the damping washer not only ensures the strength but also meets the requirement of damping and buffering, the damping washer is provided with a plurality of waist-shaped grooves which are uniformly distributed around the circle center.

Further, in order to facilitate the limit fixing of the shock absorption gasket, one end of the shock absorption gasket is limited in the steering gear shell through a steel wire retainer ring.

Further, in order to increase the strength, toughness and wear resistance of the cushion ring, the material of the cushion ring is PPA-GF33 plastic.

The utility model has the advantages that: the utility model discloses a set up damping washer in the steering gear casing, when the bulb seat removed extreme position, damping washer had played the cushioning effect, had avoided having guaranteed the travelling comfort and the security that the auto steering takes place because of abnormal sound and steering wheel resilience that mechanical collision took place.

The present invention will be described in more detail with reference to the accompanying drawings and examples.

Drawings

Fig. 1 is a cross-sectional view of the utility model relates to a terminal buffer structure of EPS stroke.

Fig. 2 is a top view of the shock absorbing washer of the present invention.

Fig. 3 is a sectional view a-a of fig. 2.

Fig. 4 is a plan view of the middle wire retainer ring of the present invention.

Detailed Description

As shown in fig. 1, the EPS stroke end buffer structure comprises a steering gear housing 1, wherein a rack 2 is arranged in the steering gear housing 1, the end of the rack 2 is fixedly connected with an inner tie rod ball socket 3, a shock absorption washer 4 adapted to a limiting surface 31 of the inner tie rod ball socket 3 is arranged in a concave table of the steering gear housing 1, and the inner diameter of the shock absorption washer 4 is adapted to the end of the rack 2 and the outer diameter of the inner tie rod ball socket 3.

As shown in fig. 2 and 3, in order to ensure the strength of the cushion ring 4 and meet the requirement of damping and buffering, a plurality of waist-shaped grooves 41 are uniformly distributed around the center of the circle on the cushion ring 4.

As shown in fig. 1 and 4, in order to facilitate the limit fixing of the cushion ring 4, one end of the cushion ring 4 is limited in the steering gear housing 1 by a wire retainer 5. A groove may be formed in the steering gear housing 1 and the resilient wire retainer ring 5 may be press fitted into the groove of the steering gear housing 1.

In order to increase the strength, toughness and wear resistance of the cushion ring 4, the material of the cushion ring 4 is PPA-GF33 plastic. The PPA-GF33 plastic has excellent hardware performance, good heat resistance and crack resistance, can maintain the strength in high temperature environment and ensure the service life of the damping washer.

The principle of the utility model is as follows: the rack 2 drives the inner tie rod ball seat 3 to move left and right, when the ball seat 3 moves to the limit position, the limit surface 31 of the ball seat 3 is contacted with the damping washer 4, and the damping washer 4 deforms to play a role in buffering.

The present invention has been described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited to the above embodiments, and various modifications made by the method concept and technical solution of the present invention or those directly applied to other applications without modification fall within the protection scope of the present invention.

Claims

1. The utility model provides a terminal buffer structure of EPS stroke, includes steering gear casing (1), steering gear casing (1) in be provided with rack (2), the end and interior pull rod bulb seat (3) fixed connection of rack (2), its characterized in that, be provided with in the concave station of steering gear casing (1) damping washer (4) of spacing face (31) of interior pull rod bulb seat (3) of adaptation, the external diameter of internal diameter adaptation rack (2) end and interior pull rod bulb seat (3) of damping washer (4).

2. An EPS stroke end buffering structure as claimed in claim 1, wherein the shock-absorbing washer (4) is provided with a plurality of waist-shaped grooves (41) uniformly distributed around the center of circle.

3. The EPS stroke end buffering structure according to claim 1, wherein one end of the cushion washer (4) is retained in the steering gear housing (1) by a wire retainer ring (5).

4. The EPS stroke end buffering structure as claimed in any one of claims 1 to 3, wherein the material of the shock-absorbing washer (4) is PPA-GF33 plastic.