CN216742778U

CN216742778U - Novel clearance compensation mechanism for worm gear and worm of electric steering system

Info

Publication number: CN216742778U
Application number: CN202220525225.9U
Authority: CN
Inventors: 陈崇宾; 李绪涛; 李赵
Original assignee: Xinxiang Aidiwei Automotive Technology Co ltd
Current assignee: North Henan Steering System Xinxiang Co ltd
Priority date: 2022-03-11
Filing date: 2022-03-11
Publication date: 2022-06-14
Anticipated expiration: 2032-03-11

Abstract

The utility model discloses a novel worm and gear clearance compensation mechanism of an electric steering system, which comprises a worm and a worm gear which are arranged in a steering gear shell, wherein a support sleeve is in clearance fit with the tail end of the inner wall of the steering gear shell; the side wall of the steering gear shell is provided with a mounting hole, a clearance adjusting nut is in threaded connection with the mounting hole, the clearance adjusting nut is in sliding nesting with a clearance adjusting ejector rod towards the side wall of the through hole, one end of the clearance adjusting ejector rod penetrates into the through hole to be in contact with the outer wall of the lower end bearing, and a clearance adjusting spring is arranged in an accommodating groove formed in the other end of the clearance adjusting ejector rod; the clearance adjusting ejector rod is provided with a second annular oil storage groove in the circumferential direction, and the hydraulic control device has the advantages that the clearance adjusting assembly works smoothly, abnormal sound generated by the steering gear in working is small, the clearance compensating mechanism is convenient to disassemble and assemble, and the like.

Description

Novel clearance compensation mechanism for worm gear and worm of electric steering system

Technical Field

The utility model relates to the technical field of electric steering, in particular to a novel worm and gear clearance compensation mechanism of an electric steering system.

Background

The electric steering system mainly reduces and increases the torque and the rotating speed of a power-assisted motor through a worm and gear reducing mechanism, simultaneously converts the torque and the rotating speed into rack force and axial movement of a rack by combining a rack and pinion mechanism to realize the power-assisted steering of the whole vehicle, thereby realizing the aim of the electric power-assisted steering, when the steering is reversed, the worm and gear are meshed to drive the power assistance, the worm drives a lower end bearing to move outwards under the action of self-meshing thrust, after the steering is reversed, no power assistance exists between the worm and gear, a certain gap exists between the worm and gear, when the steering is reversed again, collision abnormal sound occurs because the worm and gear have the gap, most of the existing worm and gear gap compensation mechanisms enable an ejector rod to generate pretightening force to the lower end bearing through a spring to carry out gap compensation, so that the worm is constantly contacted with the worm, but the working smoothness of a gap adjustment component is poor, the clearance compensation effect of the worm and gear mechanism is poor, abnormal sound generated during the operation of the steering gear is large, the clearance compensation mechanism is inconvenient to assemble and disassemble, the structure is complex, the cost is high, and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the existing defects and provides a novel worm and gear clearance compensation mechanism of an electric steering system, wherein a clearance adjustment assembly runs smoothly, the clearance compensation effect of the worm and gear mechanism is good, abnormal sound generated during the running of a steering gear is small, the clearance compensation mechanism is convenient to disassemble and assemble, the structure is simple, the cost is low, and the problems in the background art can be effectively solved.

In order to achieve the purpose, the utility model provides the following technical scheme: a novel worm and gear clearance compensation mechanism of an electric steering system comprises a worm and a worm gear which are arranged in a steering gear shell and are meshed with each other, and further comprises a power-assisted motor, wherein a support sleeve is in clearance fit with the tail end of the inner wall of the steering gear shell, a lower end bearing is in clearance fit with the support sleeve, an upper end bearing is fixedly arranged at the initial end of the inner wall of the steering gear shell, and the upper end and the lower end of the worm are in interference fit with the upper end bearing and the lower end bearing respectively; the end part of the upper end of the worm is connected with a rotating shaft of the power-assisted motor through a coupler; the tail end of the steering gear shell is of an opening structure, a sealing cover is detachably connected to the opening, and one side wall of the sealing cover is tightly attached to the supporting sleeve; the supporting sleeve comprises a supporting sleeve body, the supporting sleeve body is of an annular structure, the inner wall of the supporting sleeve body is of a waist-round hole structure, a through hole is formed in the side wall of the supporting sleeve body, smooth surfaces are oppositely arranged on the inner wall of the supporting sleeve body, and a through hole is formed in the side wall of the supporting sleeve body; a mounting hole with internal threads is formed in the position, located on the through hole, of the side wall of the steering gear shell, and a gap adjusting assembly is arranged in the mounting hole; the clearance adjusting assembly comprises a clearance adjusting nut, a clearance adjusting spring and a clearance adjusting ejector rod, the clearance adjusting nut is installed in the installation hole in a threaded mode, a sliding groove is formed in the clearance adjusting nut and faces to one side wall of the through hole, the clearance adjusting ejector rod is nested in the sliding groove in a sliding mode, one end of the clearance adjusting ejector rod in the axial direction penetrates through the through hole and is in contact with the outer wall of the lower end bearing, the smooth surface is parallel to the axial line of the clearance adjusting ejector rod, an accommodating groove is formed in the other end of the clearance adjusting ejector rod in the axial direction, the clearance adjusting spring is arranged in the accommodating groove, and two ends of the clearance adjusting spring respectively act on the clearance adjusting nut and the clearance adjusting ejector rod to enable the clearance adjusting ejector rod to tightly press the lower end bearing; the part of the gap adjusting ejector rod embedded in the sliding groove is provided with a second annular oil storage groove along the circumferential direction, and the outer wall of the second annular oil storage groove on the gap adjusting ejector rod and the inner wall of the sliding groove on the gap adjusting nut form a sealed cavity.

Furthermore, the upper end bearing is a self-aligning bearing.

Furthermore, a rubber buffer column is arranged between the end part of the upper end of the worm and a rotating shaft of the power-assisted motor.

Furthermore, an annular oil storage groove I is formed in the outer side wall of the support sleeve body along the circumferential direction of the outer side wall.

Furthermore, a rubber ring is embedded on the outer side wall of the support sleeve body along the circumferential direction of the support sleeve body.

Further, the outer diameter of the clearance adjusting spring is matched with the diameter of the accommodating groove.

Compared with the prior art, the utility model has the beneficial effects that: according to the worm and gear clearance compensation mechanism of the novel electric steering system, abnormal sound generated by relative sliding between the support sleeve and the inner wall of a shell of the steering gear can be eliminated through lubricating grease stored in the annular oil storage tank I, smoothness of movement of the clearance adjusting ejector rod in the working process of the steering gear can be guaranteed through lubricating grease stored in the annular oil storage tank II, a noise reduction effect is achieved, the support sleeve can be taken out by disassembling the sealing cover, the clearance adjusting component can be taken out by screwing the clearance adjusting nut, the clearance compensation mechanism is convenient to disassemble and assemble, the structure is simple, and the cost is lower; through the structure and the smooth surface at the support cover body, guarantee that the lower extreme bearing can only carry out reciprocating motion at the smooth surface, can not follow other direction movements, both guaranteed the exactness of worm wheel and worm meshing transmission position, can also guarantee the accuracy validity of clearance adjustment direction simultaneously, the clearance compensation of worm gear mechanism is effectual.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a portion of the diverter housing of the present invention;

FIG. 3 is a schematic view of a gap adjustment assembly according to the present invention;

FIG. 4 is a schematic structural view of a support sleeve provided with a first annular oil storage groove;

fig. 5 is a schematic structural view of the supporting sleeve inlaid with the rubber ring according to the present invention.

In the figure: the steering gear comprises a power assisting motor 1, a steering gear shell 2, a worm 3, a worm wheel 4, an upper end bearing 5, a rubber buffer column 6, a lower end bearing 7, a support sleeve 8, a support sleeve body 81, a through hole 82, a first annular oil storage groove 83, a smooth surface 84, a rubber ring 85, a gap adjusting component 9, a gap adjusting nut 91, a gap adjusting spring 92, a gap adjusting ejector rod 93, a second annular oil storage groove 931 and a sealing cover 10.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

Referring to fig. 1-5, the present invention provides a technical solution: a novel worm and gear clearance compensation mechanism of an electric steering system comprises a worm 3 and a worm gear 4 which are arranged in a steering gear shell 2 and are meshed with each other, and further comprises a power-assisted motor 1, wherein a support sleeve 8 is in clearance fit with the tail end of the inner wall of the steering gear shell 2, a lower end bearing 7 is in clearance fit with the support sleeve 8, an upper end bearing 5 is fixedly arranged at the initial end of the inner wall of the steering gear shell 2, and the upper end and the lower end of the worm 3 are in interference fit with the upper end bearing 5 and the lower end bearing 7 respectively; the end part of the upper end of the worm 3 is connected with a rotating shaft of the power-assisted motor 1 through a coupler; the tail end of the steering gear shell 2 is of an opening structure, a sealing cover 10 is detachably connected to the opening, and one side wall of the sealing cover 10 is tightly attached to the supporting sleeve 8; the supporting sleeve 8 comprises a supporting sleeve body 81, the supporting sleeve body 81 is of an annular structure, the inner wall of the supporting sleeve body 81 is of a waist-round hole structure, a through hole 82 is formed in the side wall of the supporting sleeve body 81, and smooth surfaces 84 are oppositely arranged on the inner wall of the supporting sleeve body 81; a mounting hole with internal threads is formed in the position, located at the through hole 82, of the side wall of the steering gear shell 2, and a gap adjusting assembly 9 is arranged in the mounting hole; the gap adjusting assembly 9 comprises a gap adjusting nut 91, a gap adjusting spring 92 and a gap adjusting ejector rod 93, the gap adjusting nut 91 is installed in the installation hole in a threaded manner, a sliding groove is formed in the gap adjusting nut 91 and faces one side wall of the through hole 82, the gap adjusting ejector rod 93 is nested in the sliding groove in a sliding manner, one end of the gap adjusting ejector rod 93 in the axial direction penetrates into the through hole 82 and contacts with the outer wall of the lower end bearing 7, the smooth surface 84 is parallel to the axial line of the gap adjusting ejector rod 93, the other end of the gap adjusting ejector rod 93 in the axial direction is provided with an accommodating groove, the gap adjusting spring 92 is arranged in the accommodating groove, and two ends of the gap adjusting spring 92 respectively act on the gap adjusting nut 91 and the gap adjusting ejector rod 93 to enable the gap adjusting ejector rod 93 to tightly press the lower end bearing 7; the part of the gap adjusting ejector rod 93 embedded in the sliding groove is provided with an annular oil storage groove II 931 along the circumferential direction, the outer wall of the annular oil storage groove II 931 part on the gap adjusting ejector rod 93 and the inner wall of the sliding groove on the gap adjusting nut 91 form a closed cavity, the gap adjusting ejector rod 93 is pressed against the lower end bearing 7 through the gap adjusting spring 92, the gap between the worm wheel 4 and the worm 3 is compensated according to the fixed direction under the action of the pretightening force of the gap adjusting assembly 9, meanwhile, the bearing sleeve 8 and the lower end bearing 7 are in clearance fit, the lower end bearing 7 can perform small-range reciprocating motion in the fixed direction in the bearing sleeve 8 under the action of the pretightening force of the gap adjusting assembly 9, the gap adjusting assembly has the function of adjusting the gap between the worm wheel 4 and the worm 3, the pressing force of the gap adjusting ejector rod 93 on the lower end bearing 7 can be adjusted by screwing the gap adjusting nut 91, and lubricating grease is injected into the annular oil storage groove II 931, can guarantee the ride comfort of clearance adjustment ejector pin 93 motion in the course of the work to and play and fall the effect of making an uproar, seal and support cover 8 through the sealed lid 10 of detachable and support cover 8 to steering gear casing 2, and support cover 8 and lower extreme bearing 7 and be clearance fit, simple structure, easy dismounting, the cost is lower.

Through the structure of the supporting sleeve body 81 and the smooth surface 84, the lower end bearing 7 can only reciprocate on the smooth surface 84 and can not move along other directions, the accuracy of the meshing transmission position of the worm wheel 4 and the worm 3 is ensured, meanwhile, the accuracy and effectiveness of the gap adjustment direction can also be ensured, and the gap compensation effect of the worm wheel and worm mechanism is good.

Furthermore, the upper end bearing 5 is a self-aligning bearing, and the inner ring and the outer ring of the self-aligning bearing have a certain swing amount and are matched with the swing caused by clearance compensation of the worm and gear speed reducing mechanism.

Furthermore, a rubber buffer column 6 is arranged between the end part of the upper end of the worm 3 and a rotating shaft of the power-assisted motor 1, the rubber buffer column 6 is in a pressed state after assembly, the rebound force of the rubber buffer column 6 plays a role in buffering the axial force of the worm 3 and the axial gap of the inner ring and the outer ring of the upper end bearing 5, and abnormal sound generated by the axial gap of the inner ring and the outer ring of the upper end bearing 5 when the steering gear is reversed or in a bumpy state is eliminated.

Furthermore, an annular oil storage groove I83 is formed in the outer side wall of the supporting sleeve body 81 in the circumferential direction, or a rubber ring 85 can be embedded in the outer side wall of the supporting sleeve body 81 in the circumferential direction, and abnormal sound generated by relative sliding between the supporting sleeve 8 and the inner wall of the steering gear shell 2 can be eliminated by the aid of the rubber ring 85 or by injecting lubricating grease into the annular oil storage groove I83.

Further, the outer diameter of clearance adjustment spring 92 and the diameter looks adaptation of holding tank can play spacing and guide effect to the flexible of clearance adjustment spring 92 through the holding tank, and clearance adjustment subassembly 9 moves more steadily smoothly.

When in use: the inner hole of the supporting sleeve 8 is in clearance fit with the lower end bearing 7, the clearance adjusting ejector rod 93 is pressed against the lower end bearing 7 under the action of the pretightening force of the clearance adjusting assembly 9, and the lower end bearing 7 can reciprocate in a small range along the smooth surface 84 in the supporting sleeve 8 to play a role in adjusting the clearance between the worm wheel 4 and the worm 3; the pressing force of the gap adjusting mandril 93 on the lower end bearing 7 can be adjusted by screwing the gap adjusting nut 91; the rubber ring 85 or the lubricating grease is injected into the annular oil storage groove I83, so that abnormal sound generated by relative sliding between the support sleeve 8 and the inner wall of the steering gear shell 2 can be eliminated; the lubricating grease stored in the annular oil storage groove II 931 can ensure the smoothness of the movement of the gap adjusting ejector rod 93 in the working process of the steering gear and has the noise reduction effect; the rebound force of the rubber buffer column 6 plays a role in buffering the axial force of the worm 3 and the axial clearance between the inner ring and the outer ring of the upper end bearing 5, and abnormal sound generated by the axial clearance between the inner ring and the outer ring of the upper end bearing 5 when the steering gear is in a reversing or bumping state is eliminated; the supporting sleeve 8 can be taken out by disassembling the sealing cover 10, and the clearance adjusting component 9 can be taken out by screwing the clearance adjusting nut 91, so that the clearance compensation mechanism is convenient to disassemble and assemble, simple in structure and low in cost.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a novel clearance compensation mechanism of worm gear of electric steering system, is including setting up in the worm and the worm wheel of steering gear casing intermeshing, still includes helping hand motor, its characterized in that: the tail end of the inner wall of the steering gear shell is in clearance fit with a support sleeve, a lower end bearing is in clearance fit in the support sleeve, an upper end bearing is fixedly arranged at the initial end of the inner wall of the steering gear shell, and the upper end and the lower end of the worm are in interference fit with the upper end bearing and the lower end bearing respectively; the end part of the upper end of the worm is connected with a rotating shaft of the power-assisted motor through a coupler; the tail end of the steering gear shell is of an opening structure, a sealing cover is detachably connected to the opening, and one side wall of the sealing cover is tightly attached to the supporting sleeve; the supporting sleeve comprises a supporting sleeve body, the supporting sleeve body is of an annular structure, the inner wall of the supporting sleeve body is of a waist-round hole structure, a through hole is formed in the side wall of the supporting sleeve body, and smooth surfaces are oppositely arranged on the inner wall of the supporting sleeve body; a mounting hole with internal threads is formed in the position, located on the through hole, of the side wall of the steering gear shell, and a gap adjusting assembly is arranged in the mounting hole; the clearance adjusting assembly comprises a clearance adjusting nut, a clearance adjusting spring and a clearance adjusting ejector rod, the clearance adjusting nut is installed in the installation hole in a threaded mode, a sliding groove is formed in the clearance adjusting nut and faces to one side wall of the through hole, the clearance adjusting ejector rod is nested in the sliding groove in a sliding mode, one end of the clearance adjusting ejector rod in the axial direction penetrates through the through hole and is in contact with the outer wall of the lower end bearing, an accommodating groove is formed in the other end of the clearance adjusting ejector rod in the axial direction, the clearance adjusting spring is arranged in the accommodating groove, and two ends of the clearance adjusting spring act on the clearance adjusting nut and the clearance adjusting ejector rod respectively to enable the clearance adjusting ejector rod to press the lower end bearing tightly; the part of the gap adjusting ejector rod embedded in the sliding groove is provided with a second annular oil storage groove along the circumferential direction, and the outer wall of the second annular oil storage groove on the gap adjusting ejector rod and the inner wall of the sliding groove on the gap adjusting nut form a sealed cavity.

2. The novel worm and gear clearance compensation mechanism of the electric steering system according to claim 1, characterized in that: the upper end bearing is a self-aligning bearing.

3. The novel worm and gear clearance compensation mechanism of the electric steering system according to claim 1, characterized in that: and a rubber buffer column is arranged between the end part of the upper end of the worm and the rotating shaft of the power-assisted motor.

4. The novel worm and gear clearance compensation mechanism of the electric steering system according to claim 1, characterized in that: an annular oil storage groove I is formed in the outer side wall of the supporting sleeve body in the circumferential direction of the supporting sleeve body.

5. The novel worm and gear clearance compensation mechanism of the electric steering system according to claim 1, characterized in that: and a rubber ring is embedded on the outer side wall of the support sleeve body along the circumferential direction of the support sleeve body.

6. The novel worm and gear clearance compensation mechanism of the electric steering system according to claim 1, characterized in that: the outer diameter of the clearance adjusting spring is matched with the diameter of the accommodating groove.