Limiting structure for protective sleeve of input shaft of automobile steering device

Abstract

The utility model discloses a limiting structure for an input shaft protective sleeve of an automobile steering device, and belongs to the technical field of automobiles. The steering gear input shaft protective sleeve solves the problem that a steering gear input shaft protective sleeve in the prior art is prone to excessively moving downwards during application. The steering gear input shaft protective sleeve mainly comprises a steering gear input shaft, a bearing gland is installed on the steering gear input shaft, the steering gear input shaft protective sleeve is sleeved on the upper side of the bearing gland of the steering gear input shaft, the steering gear input shaft protective sleeve comprises a protective sleeve body, a gland cover is installed at the lower end of the protective sleeve body, and the inner diameter of the gland cover is larger than that of the protective sleeve body. The gland cover and the protective sleeve body are in transition through an arc-shaped face, the steering gear input shaft is provided with an annular boss on the upper side of the bearing gland, the steering gear input shaft is provided with a limiting ring on the boss, the outer diameter of the boss is larger than the inner diameter of the limiting ring and smaller than the outer diameter of the limiting ring, and the inner diameter of the arc-shaped face is smaller and smaller from bottom to top. The outer diameter of the limiting ring is larger than the inner diameter of the arc-shaped face upper end and smaller than the inner diameter of the arc-shaped face lower end.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobiles, and in particular relates to a limiting structure of a protective sleeve of an input shaft of an automobile steering gear. Background Art

[0002] In the steering system of a car, the steering gear input shaft is a key component, responsible for transmitting the driver's steering intention to the steering system, thereby controlling the steering of the wheels. Therefore, it is crucial to protect the steering gear input shaft and ensure its stability. In order to protect the steering gear input shaft, a steering gear input shaft protective sleeve is often installed on the outside of the steering gear input shaft to prevent dust and the like from entering the bearing gland. The current steering gear input shaft protective sleeve has the problem of being easily excessively moved downward during application, causing the steering gear input shaft protective sleeve to contact the top surface of the bearing gland. The contact between the steering gear input shaft protective sleeve and the top surface of the bearing gland will cause the steering gear input shaft protective sleeve to make abnormal noises and vibrations when the steering gear input shaft is rotating, which has a great impact on driving comfort and safety. Summary of the invention

[0003] The utility model aims to provide a limiting structure of a protective sleeve of an input shaft of an automobile steering gear, so as to overcome the defects in the prior art.

[0004] The utility model is realized by adopting the following technical scheme: a limiting structure of a protective sleeve of an automobile steering gear input shaft comprises a steering gear input shaft, a bearing pressure cover is installed on the steering gear input shaft, a steering gear input shaft protective sleeve is sleeved on the upper side of the bearing pressure cover of the steering gear input shaft, the steering gear input shaft protective sleeve comprises a protective sleeve body, a pressure cover is installed at the lower end of the protective sleeve body, the inner diameter of the pressure cover is larger than the inner diameter of the protective sleeve body, an arc-shaped surface transition is provided between the pressure cover and the protective sleeve body, an annular boss is arranged on the upper side of the bearing pressure cover of the steering gear input shaft, a limiting ring is installed on the boss of the steering gear input shaft, the outer diameter of the boss is larger than the inner diameter of the limiting ring and smaller than the outer diameter of the limiting ring, the inner diameter of the arc surface becomes smaller from bottom to top, the outer diameter of the limiting ring is larger than the inner diameter of the upper end of the arc surface and smaller than the inner diameter of the lower end of the arc surface.

[0005] Furthermore, the limiting ring is made of stainless steel.

[0006] Furthermore, a bellows section is provided on the protective cover body.

[0007] Furthermore, the limiting ring is provided with an opening, and the limiting ring is clamped on the steering gear input shaft.

[0008] Furthermore, a tapered surface is provided on the boss.

[0009] Furthermore, the limiting ring is fixed on the steering gear input shaft by welding.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] 1. The utility model installs a limit ring on the steering gear input shaft, and the outer diameter of the limit ring is larger than the outer diameter of the boss, and the outer diameter of the limit ring is larger than the inner diameter of the upper end of the arc surface and smaller than the inner diameter of the lower end of the arc surface, so that the height and outer diameter of the boss on the steering gear input shaft can be increased. By increasing the height and outer diameter of the boss, the height of the pressure cover on the steering gear input shaft protective sleeve can be increased, so that the pressure cover at the bottom of the current steering gear input shaft protective sleeve will not contact the top surface of the bearing pressure cover, thereby avoiding the problem of abnormal noise and vibration of the steering gear input shaft protective sleeve when the steering gear input shaft is rotating. By increasing the outer diameter of the boss, the limiting effect of the steering gear input shaft protective sleeve can also be improved, avoiding the steering gear input shaft protective sleeve from excessive downward displacement during long-term use, so that the pressure cover contacts the top surface of the bearing pressure cover.

[0012] 2. The limit ring described in the utility model can be easily installed by setting an opening. During installation, it is only necessary to insert the limit ring from the top of the steering gear input shaft. Since the limit ring has a certain elasticity, when the outer diameter of the steering gear input shaft is larger than the inner diameter of the limit ring, the limit ring can be clamped on the steering gear input shaft through the opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a partial cross-sectional view of the utility model;

[0015] Figure 3 yes Figure 2 A partial enlarged view of point Ⅰ in the middle;

[0016] Figure 4 yes Figure 3 Schematic diagram when the limit ring 8 is not installed;

[0017] Figure 5 It is a schematic diagram of the limiting ring 8 of the utility model.

[0018] In the figure: 1. steering gear input shaft; 2. bearing cover; 3. steering gear input shaft protective sleeve; 4. protective sleeve body; 5. cover cover; 6. arc surface; 7. boss; 8. limit ring; 9. bellows section; 10. opening; 11. conical surface. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0020] A steering gear input shaft protective sleeve limiting structure for an automobile comprises a steering gear input shaft 1, a bearing pressure cover 2 is installed on the steering gear input shaft 1, a steering gear input shaft protective sleeve 3 is sleeved on the upper side of the bearing pressure cover 2 of the steering gear input shaft 1, the steering gear input shaft protective sleeve 3 comprises a protective sleeve body 4, a pressure cover 5 is installed on the lower end of the protective sleeve body 4, the inner diameter of the pressure cover 5 is larger than the inner diameter of the protective sleeve body 4, and an arc surface 6 is used to transition between the pressure cover 5 and the protective sleeve body 4, an annular boss 7 is arranged on the upper side of the bearing pressure cover 2 of the steering gear input shaft 1, a limiting ring 8 is installed on the boss 7 of the steering gear input shaft 1, the outer diameter of the boss 7 is larger than the inner diameter of the limiting ring 8 and smaller than the outer diameter of the limiting ring 8, the inner diameter of the arc surface 6 becomes smaller from bottom to top, and the outer diameter of the limiting ring 8 is larger than the inner diameter of the upper end of the arc surface 6 and smaller than the inner diameter of the lower end of the arc surface 6.

[0021] When the utility model is in use, the upper part of the bearing gland 2 is in the gland cover 5 , and the steering gear input shaft protection sleeve 3 can protect the bearing gland 2 . The steering gear input shaft 1 is provided with a limiting ring 8, and the outer diameter of the limiting ring 8 is larger than the outer diameter of the boss 7, and the inner diameter of the limiting ring 8 is smaller than the outer diameter of the boss 7. The boss 7 serves to prevent the limiting ring 8 from sliding downward, so that the limiting ring 8 cannot slide to the lower side of the boss 7. The outer diameter of the limiting ring 8 is larger than the inner diameter of the upper end of the arc surface 6 and smaller than the inner diameter of the lower end of the arc surface 6, so that the height and outer diameter of the boss 7 on the steering gear input shaft 1 can be increased. By increasing the height and outer diameter of the boss 7, the height of the pressure cover 5 on the steering gear input shaft protective sleeve 3 can be increased, so that the pressure cover 5 at the bottom of the current steering gear input shaft protective sleeve 3 will not contact the top surface of the bearing pressure cover 2, so as to avoid the problem of abnormal noise and vibration of the steering gear input shaft protective sleeve 3 when the steering gear input shaft 1 is rotating. By increasing the outer diameter of the boss 7, the limiting effect of the steering gear input shaft protective sleeve 3 can be improved, so as to avoid the steering gear input shaft protective sleeve 3 from shifting downward during long-term use, so that the pressure cover 5 contacts the top surface of the bearing pressure cover 2.

[0022] The protective sleeve body 4 is provided with a bellows section 9 .

[0023] The limiting ring 8 is provided with an opening 10 , and the limiting ring 8 is clamped on the steering gear input shaft 1 .

[0024] The limit ring 8 described in the utility model can be easily installed by setting the opening 10. During installation, the limit ring 8 can be inserted from the top of the steering gear input shaft 1. Since the limit ring 8 has a certain elasticity, when the outer diameter of the steering gear input shaft 1 is larger than the inner diameter of the limit ring 8, the limit ring 8 can appropriately expand the inner diameter through the opening 10 to facilitate installation; when the limit ring 8 is not put on the steering gear input shaft 1, the opening 10 on the limit ring 8 is not opened. After the limit ring 8 is put on the steering gear input shaft 1, the opening 10 on the limit ring 8 is appropriately opened according to the specific outer diameter of the steering gear input shaft 1.

[0025] The boss 7 is provided with a tapered surface 11 .

[0026] The utility model provides the tapered surface 11 so that the limiting ring 8 can be clamped on the tapered surface 11 on the boss 7, so that the clamping and fixing effect of the limiting ring 8 is better.

[0027] The limiting ring 8 is fixed on the steering gear input shaft 1 by welding.

[0028] In addition to the above-mentioned clamping fixing method, the limiting ring 8 of the utility model can also be welded directly to the boss 7 of the steering gear input shaft 1.

Claims

1. A limiting structure for a protective sleeve of an input shaft of an automobile steering gear, characterized in that: The invention comprises a steering gear input shaft (1), a bearing pressure cover (2) is installed on the steering gear input shaft (1), a steering gear input shaft protective sleeve (3) is sleeved on the upper side of the bearing pressure cover (2) of the steering gear input shaft (1), the steering gear input shaft protective sleeve (3) comprises a protective sleeve body (4), a pressure cover (5) is installed at the lower end of the protective sleeve body (4), the inner diameter of the pressure cover (5) is larger than the inner diameter of the protective sleeve body (4), and an arc is formed between the pressure cover (5) and the protective sleeve body (4). The steering gear input shaft (1) is provided with an annular boss (7) on the upper side of the bearing cover (2), and the steering gear input shaft (1) is provided with a limiting ring (8) on the boss (7), the outer diameter of the boss (7) is larger than the inner diameter of the limiting ring (8) and smaller than the outer diameter of the limiting ring (8), the inner diameter of the arc surface (6) decreases from bottom to top, and the outer diameter of the limiting ring (8) is larger than the inner diameter of the upper end of the arc surface (6) and smaller than the inner diameter of the lower end of the arc surface (6).

2. The automobile steering gear input shaft protection sleeve limiting structure according to claim 1 is characterized in that: The limiting ring (8) is made of stainless steel.

3. The automobile steering gear input shaft protection sleeve limiting structure according to claim 1 is characterized in that: The protective sleeve body (4) is provided with a bellows section (9).

4. The automobile steering gear input shaft protection sleeve limiting structure according to claim 1 is characterized in that: The limiting ring (8) is provided with an opening (10), and the limiting ring (8) is clamped on the steering gear input shaft (1).

5. The automobile steering gear input shaft protection sleeve limiting structure according to claim 1 is characterized in that: The boss (7) is provided with a conical surface (11).

6. The automobile steering gear input shaft protection sleeve limiting structure according to claim 1 is characterized in that: The limiting ring (8) is fixed on the steering gear input shaft (1) by welding.

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