CN214661948U

CN214661948U - Clearance elimination mechanism for automobile electric steering speed reducer

Info

Publication number: CN214661948U
Application number: CN202120985505.3U
Authority: CN
Inventors: 王静; 李连祥; 钟玲玲; 袁鲁平
Original assignee: Anhui Defu Steering System Inc
Current assignee: Anhui Defu Steering System Inc
Priority date: 2021-05-10
Filing date: 2021-05-10
Publication date: 2021-11-09
Anticipated expiration: 2031-05-10

Abstract

The utility model discloses a car electric steering speed reducer clearance elimination mechanism, including the bearing housing, set up bearing that just is used for providing the support to the worm of speed reducer on the bearing housing, with ejector pin, the spring holder of bearing housing contact and set up between spring holder and ejector pin and be used for applying the elastic element of elastic force to the ejector pin. The utility model discloses a motor-driven steering speed reducer clearance elimination mechanism of car can eliminate reduction gears's meshing clearance to reduce the abnormal sound because of the meshing clearance produces.

Description

Clearance elimination mechanism for automobile electric steering speed reducer

Technical Field

The utility model belongs to the technical field of vehicle a steering system, specifically speaking, the utility model relates to an electronic speed reducer clearance elimination mechanism that turns to of car.

Background

The electric power steering system is the development direction of the automobile steering system, and various forms of electric power steering systems, such as C-EPS, P-EPS, DP-EPS and the like, adopt a speed reducing mechanism of a worm gear and a worm or a bevel gear and the worm.

A speed reducing mechanism of a worm gear or a helical gear and a worm is mainly used for transmitting torque generated by a motor on an assistant actuating mechanism, the speed reducing and torque increasing functions are used for amplifying the torque of the motor and reducing the rotating speed of the motor, and when no clearance eliminating mechanism exists, because of the problems of assembly and part manufacturing precision, meshing clearance is inevitably formed in the using process, and abnormal sound is caused during reversing or road surface impact.

On the other hand, the meshing clearance of the worm gear or the reduction mechanism of the bevel gear and the worm is caused by self abrasion in the use process, the clearance also exists objectively, and the clearance caused by abrasion is larger along with the longer use time. Therefore, a structure capable of eliminating the backlash of the reduction mechanism is required.

A clearance eliminating mechanism for an automobile electric steering speed reducer comprises a spring seat, a spring, a push rod, a bearing sleeve, a ball bearing and the like, wherein a worm gear and a worm or a bevel gear and a worm are assembled in a shell together, and the assembly is called as the steering speed reducer.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides an automobile electric steering speed reducer clearance elimination mechanism, the purpose reduces the abnormal sound because of the meshing clearance produces.

In order to realize the purpose, the utility model discloses the technical scheme who takes does: the clearance eliminating mechanism for the automobile electric steering speed reducer comprises a bearing sleeve, a bearing, a push rod, a spring seat and an elastic element, wherein the bearing is arranged on the bearing sleeve and used for supporting a worm of the speed reducer, the push rod is in contact with the bearing sleeve, and the elastic element is arranged between the spring seat and the push rod and used for applying elastic acting force to the push rod.

The elastic element is a cylindrical helical spring.

The bearing sleeve is made of powder metallurgy.

The bearing sleeve is of a square structure, a square hole is formed in the shell of the speed reducer, and the bearing sleeve is located in the square hole.

The spring seat is in threaded connection with the shell of the speed reducer.

And one side of the bearing sleeve is provided with a plug, and the plug is in threaded connection with the shell of the speed reducer.

The utility model discloses a motor-driven steering speed reducer clearance elimination mechanism of car can eliminate reduction gears's meshing clearance to reduce the abnormal sound because of the meshing clearance produces.

Drawings

The description includes the following figures, the contents shown are respectively:

fig. 1 is an exploded schematic view of the clearance eliminating mechanism of the electric steering reducer of the automobile of the present invention;

FIG. 2 is a cross-sectional view of the reducer;

FIG. 3 is a schematic view of the gap eliminating mechanism of the electric steering reducer of the present invention;

FIG. 4 is a schematic structural view of the bearing sleeve and the plug;

labeled as: 1. a spring seat; 2. an elastic element; 3. a top rod; 4. a bearing housing; 5. a first bearing; 6. a housing; 7. a plug; 8. a worm; 9. a second bearing; 10. a helical gear.

Detailed Description

The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings, for the purpose of helping those skilled in the art to understand more completely, accurately and deeply the conception and technical solution of the present invention, and to facilitate its implementation.

It should be noted that, in the following embodiments, the "first" and "second" do not represent an absolute distinction relationship in structure and/or function, nor represent a sequential execution order, but merely for convenience of description.

As shown in fig. 1 to 3, the utility model provides a clearance eliminating mechanism for automobile electric steering speed reducer, including bearing housing 4, set up on bearing housing 4 and be used for providing the first bearing 5 that supports to the worm 8 of speed reducer, the ejector pin 3 that contacts with bearing housing 4, spring holder 1 and set up between spring holder 1 and ejector pin 3 and be used for applying elastic force's elastic element 2 to ejector pin 3.

Specifically, as shown in fig. 1 to 3, the speed reducer includes a housing 6, a first bearing 5 and a second bearing 9 are disposed at two ends of a worm 8, the first bearing 5 is located in a central hole of a bearing sleeve 4, the second bearing 9 is located inside the housing 6, the worm 8 is meshed with a worm wheel or a helical gear, the first bearing 5 and the second bearing 9 are both ball bearings, the size of the first bearing 5 is smaller than that of the second bearing 9, and two bearings with one large side and one small side are adopted, so that the worm 8 can be conveniently assembled from the direction of the second bearing 9. When first bearing 5 reciprocated simultaneously, second bearing 9 can carry out the aligning compensation, consequently first bearing 5 chooses for use aligning ball bearing or the great deep groove ball bearing of play. The first bearing 5 is assembled with the bearing sleeve 4, and the first bearing 5 is in clearance fit with the small end of the worm 8, so that the assembly is easy. The bearing sleeve 4 and the first bearing 5 are in interference fit, the first bearing 5 can act along with the bearing sleeve 4 for a while, and the problem of axial movement cannot be caused. A plug 7 is arranged at the left end of the bearing sleeve 4, the plug 7 is in threaded connection with the shell 6, and the plug 7 is used for controlling the axial movement space of the bearing sleeve 4. Spring holder 1 passes through threaded connection and fixes on casing 6, and its inside is equipped with ejector pin 3, and ejector pin 3 upper end and spring holder 1 hole are clearance fit, can guarantee that ejector pin 3 removes in the direction of regulation. An elastic element 2 is arranged between the spring seat 1 and the ejector rod 3, and the elastic element 2 is a cylindrical helical spring and is a compression spring. Because the spring seat 1 is fixed, the spring force generated by the elastic element 2 is always downward and presses the push rod 3, so that the push rod 3 is kept in contact with the bearing sleeve 4.

Preferably, as shown in fig. 1 and 2, one end of the push rod 3 is in contact with the bearing sleeve 4, and the end of the push rod 3 has a contact surface in contact with the bearing sleeve 4, the contact surface is a spherical surface, so that the downward force generated by the elastic element 2 can be ensured, and the bearing sleeve 4 is pressed by the spherical surface of the push rod 3. Because the spherical surface of the mandril 3 is in point contact with the bearing sleeve 4, the spring force can be ensured to be always towards the direction close to the worm wheel, and no force in other directions is generated.

Preferably, the material of the bearing sleeve 4 is powder metallurgy, and because the material has oil storage pores, the bearing sleeve 4 can be ensured not to generate abnormal abrasion on the shell 6 when moving up and down.

As shown in fig. 1 and 3, the bearing sleeve 4 is of a square structure, a square hole is formed in a housing 6 of the speed reducer, the bearing sleeve 4 is located in the square hole, and the bearing sleeve 4 can move along the length direction of the ejector rod 3. The direction perpendicular to the installation direction of the worm gear or the helical gear and the worm is in clearance fit, so that the bearing sleeve 4 can move up and down along the axis; the bearing bush is parallel to the installation direction of a worm gear or a bevel gear and a worm, two larger gap spaces A and B are respectively arranged, the gap A is a gap between the bearing bush 4 and a first inner wall surface of the shell 6, the gap B is a gap between the bearing bush 4 and a second inner wall surface of the shell 6, the first inner wall surface and the second inner wall surface are two parallel inner wall surfaces in a square hole of the shell 6, the bearing bush 4 is positioned between the first inner wall surface and the second inner wall surface, the first inner wall surface and the second inner wall surface are perpendicular to the length direction of the ejector rod 3, and the second inner wall surface is provided with a hole for the ejector rod 3 to penetrate through. The clearance A: the worm gear or the helical gear and the worm wear to generate a gap in the whole life cycle use process of the speed reducer, the direction of the gap is towards the direction of reducing the gap A, and the value of the gap A is far larger than the value of the self-wear gap, so that when the self-wear gap is generated, the worm gear or the helical gear and the worm can be meshed without gap through spring force, and meanwhile, the bearing sleeve 4 cannot interfere with the shell 6. A gap B: the housing 6 is difficult to avoid in the machining process, machining errors occur, meanwhile, part manufacturing errors also exist in the worm gear or the helical gear and the worm, and due to the accumulated errors, the installation center of the worm gear or the helical gear and the worm is too small, even the worm gear or the helical gear and the worm can be tightly meshed and cannot move, so that a gap B is set, and the installation problem caused by errors can be avoided.

As shown in fig. 4, a gap C is formed between the housing 6 and the bearing sleeve 4 in the axial direction of the worm to ensure that the bearing sleeve 4 can move up and down freely without being pressed by the plug 7.

The working principle is as follows:

in the operation process of the steering speed reducer, the worm always bears the radial force far away from the worm wheel or the helical gear, at the moment, the elastic element 2 arranged in the spring seat 1 generates a spring force to press the ejector rod 3 downwards, the ejector rod 3 transmits the downwards pressing force to the bearing sleeve 4, and the bearing sleeve 4 drives the first bearing 5 to press the worm downwards together, so that the worm is always meshed with the worm wheel or the helical gear without a gap.

The steering speed reducer can continuously generate abrasion in the use process of the whole life cycle, and the abrasion can cause the meshing clearance between the worm gear and the worm or between the bevel gear and the worm to be larger and larger. At the moment, the elastic element 2 arranged in the spring seat 1 generates spring force to press the ejector rod 3 downwards, the downward pressing force is transmitted to the bearing sleeve 4 by the ejector rod 3, and the bearing sleeve 4 drives the first bearing 5 to press the worm downwards, so that the worm is always meshed with the worm wheel or the helical gear without clearance.

Under the action of spring force, the worm always follows the worm wheel or the helical gear to carry out gapless meshing no matter when the motion direction of the steering speed reducer is switched or road surface impacts occur.

The invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-described manner. Various insubstantial improvements are made by adopting the method conception and the technical proposal of the utility model; or without improvement, the above conception and technical solution of the present invention can be directly applied to other occasions, all within the protection scope of the present invention.

Claims

1. Electronic turn to speed reducer clearance elimination mechanism of car, its characterized in that: the worm gear reducer comprises a bearing sleeve, a bearing arranged on the bearing sleeve and used for supporting a worm of the reducer, a push rod in contact with the bearing sleeve, a spring seat and an elastic element arranged between the spring seat and the push rod and used for applying elastic acting force to the push rod.

2. The automotive electric steering reducer clearance elimination mechanism of claim 1, characterized in that: the elastic element is a cylindrical helical spring.

3. The automotive electric steering reducer clearance elimination mechanism according to claim 1 or 2, characterized in that: the bearing sleeve is made of powder metallurgy.

4. The automotive electric steering reducer clearance elimination mechanism according to claim 1 or 2, characterized in that: the bearing sleeve is of a square structure, a square hole is formed in the shell of the speed reducer, and the bearing sleeve is located in the square hole.

5. The automotive electric steering reducer clearance elimination mechanism according to claim 1 or 2, characterized in that: the spring seat is in threaded connection with the shell of the speed reducer.

6. The automotive electric steering reducer clearance elimination mechanism of claim 5, characterized in that: and one side of the bearing sleeve is provided with a plug, and the plug is in threaded connection with the shell of the speed reducer.