A support sleeve type gear and rack gap compensation mechanism

Abstract

The utility model discloses a kind of support sleeve type gear rack gap compensation mechanism, it is related to automobile technical field, to solve the problem that the friction between the adjusting body elastic washer and shell increases after the radial supporting force of adjusting body increases in prior art, leading to the increase of movement resistance, the technical scheme used is that there is adjusting body inside shell, there is support sleeve between adjusting body and shell, adjusting body is slidably connected to inside support sleeve, opening is set on the other side of shell, opening is equipped with thread, adjusting screw plug is connected in opening thread, there is adjusting spring between adjusting body and adjusting screw plug, adjusting body other end is contacted with rack, the utility model changes the position of radial O type ring, increases adjusting body support sleeve, realizes the bidirectional optimization of radial supporting force promotion and axial movement resistance reduction, avoid the problem that elastic washer and shell directly rub in traditional scheme, cooperate the elastic adjusting effect of self-adapting groove, reduce adjusting body axial movement resistance.

Description

Technical Field

[0001] This utility model relates to the field of automotive technology, specifically to a support sleeve type gear rack backlash compensation mechanism. Background Technology

[0002] The clearance adjustment mechanism of a rack and pinion steering system is a core component of the steering system. It supports the rack and pinions and compensates for the meshing backlash, ensuring smooth rack and pinion operation, reducing impact, and minimizing noise. It plays a crucial role in the performance and noise reduction of the steering system.

[0003] Chinese patent CN109625078A discloses a steering gear meshing clearance adjustment device. The technical solution includes a pressure block plug, a supporting pressure block, and an elastic washer disposed between the pressure block plug and the supporting pressure block to apply an elastic force to the supporting pressure block. This steering gear meshing clearance adjustment device, by setting an elastic washer between the pressure block plug and the supporting pressure block, changes the mode of the steering gear system, including the gears, rack, supporting pressure block, pressure block plug, and coil spring. This effectively avoids abnormal noise caused by collisions between the pressure block plug and the supporting pressure block. Furthermore, the elastic washer also increases the pressure on the supporting pressure block, ensuring that the meshing clearance between the gears and rack meets the requirements.

[0004] The existing technology also has the following shortcomings: after the radial support force of the adjusting body increases, the friction between the circumferential elastic washer of the adjusting body and the shell increases, and the axial movement resistance of the adjusting body increases, which in turn brings a series of negative effects. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the existing defects and provide a support sleeve type gear rack backlash compensation mechanism, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, this utility model discloses a support sleeve type gear rack backlash compensation mechanism. The technical solution includes a housing, a rack at a radial position of the housing, a gear meshing on one side of the rack, an adjusting body inside the housing, a support sleeve between the adjusting body and the housing, an O-ring between the support sleeve and the housing, the adjusting body being slidably connected to the inside of the support sleeve, an opening on the other side of the housing, a threaded opening, an adjusting plug being threaded into the opening, an adjusting spring between the adjusting body and the adjusting plug, and the other end of the adjusting body contacting the rack.

[0007] As a preferred technical solution of this utility model, a limiting groove is provided on the inner side of the shell, and a limiting protrusion is provided on the outer side of the support sleeve, with the limiting groove and the limiting protrusion in contact.

[0008] As a preferred technical solution of this utility model, an adaptive groove is opened on the support sleeve. There are multiple adaptive grooves, which are evenly arranged in a ring on the support sleeve. An O-ring placement groove is opened on the outside of the support sleeve. A radial support O-ring is placed in the O-ring placement groove. The other side of the radial support O-ring is in contact with the inside of the shell.

[0009] As a preferred technical solution of this utility model, an O-ring placement groove is opened on the inner side of the adjusting screw plug, an axial support O-ring is placed in the O-ring placement groove, and the other side of the O-ring placement groove is in contact with the adjusting body.

[0010] As a preferred technical solution of this utility model, the adjusting screw plug has a vent hole in the middle, and the vent hole has a thread, and the thread in the vent hole is connected to the blockage.

[0011] As a preferred technical solution of this utility model, there is a shim between the adjusting body and the rack. The shim is arc-shaped and has a mounting protrusion at its end. A mounting hole is opened in the middle of the adjusting body, and the mounting protrusion and the mounting hole are interference fit.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: By changing the position of the radial O-ring and adding an adjustment body support sleeve, this utility model achieves bidirectional optimization of increasing radial support force and reducing axial movement resistance. The radial preload of the radial support O-ring is directly transmitted to the adjustment body through the support sleeve, avoiding the problem of direct friction between the elastic washer and the shell in the traditional solution. This can meet the rack force requirements of vehicles with greater front axle loads. The inner wall of the support sleeve provides a smooth sliding surface for the adjustment body. Combined with the elastic adjustment effect of the adaptive groove, it reduces the axial movement resistance of the adjustment body, effectively avoiding the lag in clearance compensation response caused by excessive resistance, and ensuring that the gear and rack meshing clearance is always within a stable control range during steering. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the external structure of this utility model; Figure 2 This is a cross-sectional view of the structure of this utility model; Figure 3 This is a schematic diagram of the support sleeve structure of this utility model.

[0014] In the diagram: 1. Housing; 102. Limiting groove; 2. Adjusting body; 201. Mounting hole; 3. Support sleeve; 301. O-ring placement groove; 302. Adaptive groove; 303. Limiting protrusion; 4. Adjusting plug; 401. Axial support O-ring; 5. Adjusting spring; 6. Gasket; 601. Mounting protrusion; 7. Rack; 8. Gear; 9. Plug; 10. Radial support O-ring. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0016] like Figures 1 to 3 As shown, this utility model discloses a method, the technical solution of which includes a housing 1, a rack 7 at a radial position, and a gear 8 meshing on one side of the rack 7; an adjusting body 2 inside the housing 1, and a support sleeve 3 between the adjusting body 2 and the housing 1; a limiting groove 102 is formed on the inner side of the housing 1, and a limiting protrusion 303 is provided on the outer side of the support sleeve 3, the limiting groove 102 and the limiting protrusion 303 are in contact to fix the support sleeve 3; multiple adaptive grooves 302 are formed on the support sleeve 3, and they are evenly arranged in a ring array on the support sleeve 3 to achieve a tighter fit between the support sleeve 3 and the adjusting body 2 without affecting sliding; an O-ring placement groove 301 is formed on the outer side of the support sleeve 3, and a radial support O-ring 10 is placed in the O-ring placement groove 301, the other side of the radial support O-ring 10 is in contact with the inside of the housing 1, and the radial support force can be efficiently transmitted to the adjusting body 4 through the cooperation of the radial support O-ring 10 and the support sleeve 3. The adjusting body 2 is slidably connected to the inside of the support sleeve 3. An opening is opened on the other side of the housing 1, and a thread is provided in the opening. An adjusting plug 4 is threadedly connected to the opening. An adjusting spring 5 is between the adjusting body 2 and the adjusting plug 4. An O-ring placement groove 301 is opened on the inner side of the adjusting plug 4. An axial support O-ring 401 is placed in the O-ring placement groove 301. The other side of the O-ring placement groove 301 contacts the adjusting body 2 to provide axial support force. A vent hole is opened in the middle of the adjusting plug 4. The vent hole is threaded and a plug 9 is threadedly connected to the vent hole to realize venting and pressure relief during assembly. A gasket 6 is between the adjusting body 2 and the rack 7. The gasket 6 is arc-shaped, and the arc is consistent with the arc of the outer circumference of the rack 7. An installation protrusion 601 is provided at the end of the gasket 6. An installation hole 201 is opened in the middle of the adjusting body 2. The installation protrusion 601 and the installation hole 201 are interference fit. The gasket 6 is made of elastic wear-resistant material, such as polytetrafluoroethylene. The other end of the adjusting body 2 contacts the rack 7.

[0017] The working principle of this utility model is as follows: When the rack 7 is subjected to the meshing force of the gear 8 during vehicle steering, and the meshing gap of the gear rack increases due to wear after long-term use, the preload of the adjusting spring 5 will push the adjusting body 2 to slide adaptively along the inner wall of the support sleeve 3. The shim 6 continuously applies axial thrust to the rack 7, filling the gap between the gear rack in real time, reducing the sliding resistance of the adjusting body 2, and ensuring meshing accuracy.

[0018] During this process, the adaptive grooves 302 evenly distributed on the support sleeve 3 can cause the inner wall of the support sleeve 3 to undergo slight elastic deformation as the adjusting body 2 slides, which not only avoids jamming when the adjusting body 2 slides, but also further improves the fit between the adjusting body 2 and the support sleeve 3, ensuring the efficiency of force transmission.

[0019] The mechanical connection involved in this utility model is a common method used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments. It is common knowledge.

[0020] Components not described in detail in this article are existing technologies.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A support sleeve type gear rack backlash compensation mechanism, comprising a housing (1), a rack (7) located radially on the housing (1), and a gear (8) meshing on one side of the rack (7), characterized in that: Inside the housing (1) is an adjusting body (2), between the adjusting body (2) and the housing (1) is a support sleeve (3), between the support sleeve (3) and the housing (1) is an O-ring, the adjusting body (2) is slidably connected to the inside of the support sleeve (3), the other side of the housing (1) has an opening, the opening is provided with a thread, the opening is threaded to an adjusting plug (4), between the adjusting body (2) and the adjusting plug (4) is an adjusting spring (5), the other end of the adjusting body (2) is in contact with a rack (7).

2. The support sleeve type gear rack backlash compensation mechanism according to claim 1, characterized in that: A limiting groove (102) is provided on the inner side of the housing (1), and a limiting protrusion (303) is provided on the outer side of the support sleeve (3). The limiting groove (102) and the limiting protrusion (303) are in contact.

3. The support sleeve type gear rack backlash compensation mechanism according to claim 2, characterized in that: An adaptive groove (302) is opened on the support sleeve (3). There are multiple adaptive grooves (302) and they are evenly arranged in a ring array on the support sleeve (3). An O-ring placement groove (301) is opened on the outside of the support sleeve (3). A radial support O-ring (10) is placed in the O-ring placement groove (301). The other side of the radial support O-ring (10) is in contact with the inside of the shell (1).

4. The support sleeve type gear and rack backlash compensation mechanism according to claim 1, characterized in that: An O-ring placement groove (301) is opened on the inner side of the adjusting screw plug (4). An axial support O-ring (401) is placed in the O-ring placement groove (301). The other side of the O-ring placement groove (301) is in contact with the adjusting body (2).

5. The support sleeve type gear rack backlash compensation mechanism according to claim 4, characterized in that: The adjusting screw plug (4) has a vent hole in the middle, and there is a thread inside the vent hole. The thread inside the vent hole is connected to the plug (9).

6. The support sleeve type gear and rack backlash compensation mechanism according to claim 5, characterized in that: There is a shim (6) between the adjusting body (2) and the rack (7). The shim (6) is arc-shaped and has a mounting protrusion (601) at the end. The adjusting body (2) has a mounting hole (201) in the middle. The mounting protrusion (601) and the mounting hole (201) are interference fit.

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