Improved steering gear worm small end bearing bush structure
By improving the steering gear worm small end bearing bushing structure, the special design of the inner and outer rings and the material combination, the problems of noise and rotational torque imbalance are solved, the noise and friction are optimized, and the durability of the parts and assembly efficiency are improved.
Patent Information
- Application Number
- CN202422825507.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-11-20
AI Technical Summary
In the existing steering gear worm small end bearing bushing design, there are problems such as excessive noise caused by excessive clearance or increased rotational torque and friction caused by too small clearance.
By designing a special structure of the inner and outer rings, including snap connections, U-shaped buckle positioning, and vertical ribs or smooth arc surfaces on the inner wall of the outer ring, combined with a combination of soft material liners and hard material ribs, variable stiffness is achieved to balance noise and rotational torque.
It achieves a balance between noise and rotational torque, avoids friction problems caused by worm gear meshing being too tight or too loose, and improves the durability and assembly efficiency of parts.
Smart Images
Figure CN223424548U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of steering systems, in particular to an improved steering gear worm small end bearing bushing structure. Background Art
[0002] The current design of the bearing bushing for the small end of the worm gear consists of an inner ring (mates with the small end of the worm gear), an outer ring (mates with the housing), a joint (connected via a snap-fit connection), a small washer, and a large washer. This component provides a certain degree of swing stiffness, and the large washer provides position control, ensuring better meshing of the worm gear during transmission.
[0003] However, there are currently some shortcomings: the gap between the large liner and the inner ring in the current design will affect the swing amount during operation. When the gap is too large, the swing amount will be too large and noise will be generated; when the gap is too small, the swing amount will be too small, the worm gear meshing will become tighter, resulting in an increase in the rotational torque and an increase in the overall friction of the steering gear. Summary of the Invention
[0004] In order to overcome the deficiencies of the prior art, the utility model provides an improved steering gear worm small end bearing bushing structure, which achieves a balance between noise and rotational torque by reducing the gap and changing the stiffness.
[0005] To achieve the above-mentioned purpose, an improved steering gear worm small end bearing bushing structure is designed, which includes an outer ring and an inner ring, and is characterized in that: the outer side of the inner ring is sleeved with an outer ring, and one side of the inner ring is connected to one side of the outer ring by a snap; a small gasket is embedded in the other side of the outer ring, and a large gasket is connected to the lower part of the outer ring, and the large gasket is connected to the inner side wall of the outer ring.
[0006] The inner ring is a cylindrical structure, and one side of the inner ring is raised, and the raised portion is connected to the outer edge of the outer ring by a buckle.
[0007] The inner ring is connected to the small end of the steering gear worm.
[0008] The outer ring is a cylindrical structure, and the diameter of the outer ring is larger than the diameter of the inner ring; the inner side wall of the outer ring is a smooth arc surface or a plurality of vertical strip ribs are evenly distributed on the lower inner side wall of the outer ring; a U-shaped buckle is provided at the bottom of the outer ring, and the U-shaped buckle is bent inward.
[0009] The U-shaped buckle is connected to the shell.
[0010] The outer ring is fixed on the inner wall of the steering gear housing.
[0011] The buckle and the small pad are symmetrically arranged.
[0012] There are gaps between the small liner, the large liner and the outer edge of the inner ring.
[0013] The lower end of the big gasket is connected with the inner side wall of the outer ring, and the upper end surface of the big gasket is a smooth circular arc surface or is connected with several transverse strip-shaped ribs on the upper end surface.
[0014] Compared with the prior art, the improved steering gear worm small end bearing bush structure balances noise and rotating torque through small gap collection, rigidity change and the like. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is a structure perspective view of the utility model.
[0016] Figure 2 It is a structure sectional view of the utility model.
[0017] Figure 3 It is a structure schematic view of the inner ring in the utility model.
[0018] Figure 4 It is a structure schematic view of the outer ring in the utility model.
[0019] Figure 5 It is a structure schematic view of the outer ring in the utility model.
[0020] Figure 6 It is a structure schematic view of the outer ring in the utility model.
[0021] Figure 7 It is a structure schematic view of the outer ring in the utility model. DETAILED DESCRIPTION
[0022] The utility model will be further described below according to the drawings.
[0023] As shown in Figures 1 to 3 The outer side of the inner ring 1 is sleeved with the outer ring 2, and one side of the inner ring 1 is connected with one side of the outer ring 2 by using the buckle 3; the other side of the outer ring 2 is embedded with the small gasket 5, the big gasket 4 is connected at the lower part of the outer ring 2, and the big gasket 4 is connected with the inner side wall of the outer ring 2.
[0024] The inner ring 1 is a cylindrical structure, and one side of the inner ring 1 is protruding, and the protruding part is connected with the outer edge part of the outer ring 2 by using the buckle 3.
[0025] The inner ring 1 is connected with the small end of the steering gear worm.
[0026] The outer ring 2 is a cylindrical structure, and the diameter of the outer ring 2 is greater than the diameter of the inner ring 1; the U-shaped buckle 2-2 is arranged at the bottom of the outer ring 2, and the U-shaped buckle 2-2 is inwardly bent, and the U-shaped buckle is matched with the shell body and is used for positioning.
[0027] The outer ring 2 is fixed on the inner wall of the steering gear shell.
[0028] The buckle 3 and the small gasket 5 are symmetrically arranged.
[0029] There is a gap between the small gasket 5 , the large gasket 4 and the outer edge of the inner ring 1 .
[0030] like Figure 4 , Figure 5 The figure shows a structure of the outer ring and large liner scheme 1. A plurality of vertical strip ribs 2-1 are evenly distributed on the lower inner side wall of the outer ring 2, and the upper end surface of the large liner 4 matched therewith is a smooth arc surface.
[0031] like Figure 6 , Figure 7 The figure shows the second structure of the outer ring and large liner. The inner side wall of the outer ring 2 is a smooth arc surface, and the upper end surface of the large liner 4 matched therewith is connected with a plurality of transverse strip ribs.
[0032] The strip rib profile is designed as a spline involute structure to make the connection between the large liner and the outer ring more secure when injection molded. When subjected to positive pressure and shear force during operation, it prevents peeling and cracking, and can provide better durability.
[0033] Adding lubricating material to the small gasket instead of the oiling measure here can reduce costs and improve assembly efficiency.
[0034] The first structural design scheme of the utility model adds a strip rib structure at the junction of the large liner and the outer ring. The large liner is made of softer material. Through the combination of the soft material liner and the hard material strip rib, when the inner ring swings to the large liner during the operation of the part, the large liner can provide variable stiffness.
[0035] The mechanism works as follows: It provides a certain amount of damping when the inner ring and liner first contact (a low-stiffness zone), and then provides a limiter when the compression reaches the rib's operating position (a high-stiffness zone), ensuring proper meshing of the worm gear. This structural design balances noise and worm gear meshing, avoiding excessive friction caused by tight meshing and noise caused by loose meshing.
[0036] The second structural design scheme of the utility model adds a strip rib structure on the surface of the large liner. When the inner ring swings to the large liner through the strip rib structure, the large liner provides a force from small to large, thereby achieving the purpose of changing stiffness.
[0037] The working process is as follows: when the inner ring first contacts the liner strip, it provides a certain amount of damping (low stiffness area). When it continues to compress until it contacts the entire arc surface (high stiffness area), it provides a limit to ensure the meshing of the worm gear. This structural design balances noise and worm gear meshing, avoiding excessive friction caused by excessive meshing and noise caused by excessive meshing.
Claims
1. An improved steering gear worm small end bearing bushing structure, comprising an outer ring and an inner ring, characterized in that: An outer ring (2) is sleeved on the outer side of the inner ring (1), and one side of the inner ring (1) is connected to one side of the outer ring (2) by a buckle (3); a small liner (5) is embedded on the other side of the outer ring (2), and a large liner (4) is connected to the lower part of the outer ring (2), and the large liner (4) is connected to the inner side wall of the outer ring (2).
2. The improved steering gear worm small end bearing bushing structure according to claim 1 is characterized in that: The inner ring (1) is a cylindrical structure, and one side of the inner ring (1) is raised, and the raised portion is connected to the outer edge of the outer ring (2) by a buckle (3).
3. An improved steering gear worm small end bearing bushing structure according to claim 1 or 2, characterized in that: The inner ring (1) is connected to the small end of the steering gear worm.
4. The improved steering gear worm small end bearing bushing structure according to claim 1, characterized in that: The outer ring (2) is a cylindrical structure, and the diameter of the outer ring (2) is larger than the diameter of the inner ring (1); the inner side wall of the outer ring (2) is a smooth arc surface or a plurality of vertical strip ribs (2-1) are evenly distributed on the lower inner side wall of the outer ring (2); a U-shaped buckle (2-2) is provided at the bottom of the outer ring (2), and the U-shaped buckle (2-2) is bent inward.
5. The improved steering gear worm small end bearing bushing structure according to claim 4, characterized in that: The U-shaped buckle (2-2) is connected to the shell.
6. An improved steering gear worm small end bearing bushing structure according to claim 1 or 4, characterized in that: The outer ring (2) is fixed to the inner wall of the steering gear housing.
7. The improved steering gear worm small end bearing bushing structure according to claim 1, characterized in that: The buckle (3) and the small pad (5) are symmetrically arranged.
8. The improved steering gear worm small end bearing bushing structure according to claim 1, characterized in that: A gap is provided between the small gasket (5), the large gasket (4) and the outer edge of the inner ring (1).
9. An improved steering gear worm small end bearing bushing structure according to claim 1 or 8, characterized in that: The lower end of the large liner (4) is connected to the inner wall of the outer ring (2), and the upper end surface of the large liner (4) is a smooth arc surface or is connected to a plurality of transverse strip ribs on the upper end surface.