Rear wheel steering gear and limiting structure thereof
Through the design of coaxial sliding connection between the limit sleeve and the screw, the problems of high noise and heavy weight of the steering gear limit structure are solved, noise reduction and lightweight are achieved, and the detection accuracy of the sensor is improved.
Patent Information
- Application Number
- CN202422245082.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-09-12
AI Technical Summary
The existing steering gear limit structure generates high noise and heavier weight during use, affecting working performance and market competitiveness.
The structure is adopted for coaxial sliding connection between the limit sleeve and the screw, which prevents the screw from rotating, reduces noise and lightens the limiting parts.
Effectively avoid collision between the limiting parts and the housing, reduce noise and reduce weight, while ensuring the detection accuracy of the sensor.
Smart Images
Figure CN223224398U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of steering gears, in particular to a rear wheel steering gear and a limiting structure thereof. Background Art
[0002] A rear-wheel steering gear can correct oversteer during high-speed driving, improving driving safety. It can also reduce the turning radius at low speeds, improving low-speed maneuverability. During operation, the nut is fixed axially, and the large and small pulleys decelerate and increase torque before transmitting power to the drive nut. The drive nut rotates, transferring power to the lead screw, causing it to move linearly, driving external structures such as the outer tie rod to steer the wheels. However, while the nut drives the lead screw, twisting must be limited, especially during reverse impacts during driving, to prevent twisting from affecting the steering gear's performance. The steering gear in the prior art is provided with a limiting groove 1-2 on the shell 1-1, and the limiting groove 1-2 extends along the length direction of the guide slide and is connected to the guide slide, and a limiting member 1-3 and a limiting rod 1-5 connected to the limiting member 1-3 are provided. The limiting member 1-3 is in the limiting groove 1-2 and is connected to the screw shaft 1-4 through the limiting member 1-5, and the rotation of the limiting member 1-3 is limited by the two side walls of the limiting groove 1-2. Although this structure avoids the circumferential rotation of the screw shaft 1-4, it has high requirements on material performance during use, and after long-term exercise, the gap between the limiting member 1-3 and the limiting groove 1-2 becomes larger, which will produce a collision sound, generate a loud noise, and the overall weight is heavy, resulting in insufficient competitiveness of the product in the market. Utility Model Content
[0003] In response to the technical problem in the existing technical solution that the limiting part and the shell collide with each other and generate a lot of noise, the utility model proposes a rear wheel steering gear and its limiting structure, which relies on the limiting sleeve to prevent the rotation of the screw rod, can effectively avoid the collision between the original limiting part and the shell, and reduce noise.
[0004] The technical solution adopted by the present invention is as follows: a rear wheel steering gear limiting structure includes a screw rod, a shell and a limiting sleeve, the outer peripheral wall of the limiting sleeve is fixedly connected to the inner peripheral wall of the shell, the inner peripheral wall of the limiting sleeve is coaxially slidably arranged with the screw rod, the transverse diameter of the limiting sleeve is smaller than the vertical diameter, and the transverse diameter of the screw rod is smaller than the vertical diameter; or the vertical diameter of the limiting sleeve is smaller than the transverse diameter, and the vertical diameter of the screw rod is smaller than the transverse diameter.
[0005] Optionally, the screw rod is provided with a first limiting plane, which is symmetrically arranged on both sides of the screw rod, and the limiting sleeve is provided with a second limiting plane that slides with the first limiting plane, which is symmetrically arranged on both sides of the limiting sleeve.
[0006] Optionally, the screw rod has a first arcuate surface, the limiting sleeve has a second arcuate surface slidingly matched with the first arcuate surface, the first arcuate surface is spaced apart from the first limiting plane, and the second arcuate surface is spaced apart from the second limiting plane.
[0007] Optionally, the limiting sleeve is interference-pressed into the inner wall of the shell, and a gap is provided on the second arc-shaped surface.
[0008] Optionally, the limiting sleeve is made of a rigid material, and the inner circumferential wall of the limiting sleeve is coated with a wear-resistant self-lubricating material.
[0009] The utility model also discloses a rear wheel steering gear, comprising a dust cover, a drive assembly and the above-mentioned rear wheel steering gear limiting structure, wherein the drive assembly is cooperatively connected to the screw rod, and the dust cover is connected to the housing.
[0010] Optionally, a clamp is further included, and a groove is provided on the outer peripheral wall of the shell, and the clamp presses the dust cover into the groove.
[0011] The beneficial effects of this utility model are as follows: the stop sleeve is a special-shaped structure fixedly connected to the housing, and the shape and structure of the mating portion of the lead screw and the stop sleeve are consistent with the stop sleeve, so that the lead screw and the stop sleeve have only an axial sliding connection, preventing the lead screw from rotating. During the movement of the lead screw, collision between the original stop member and the housing is effectively avoided, reducing noise. The size and material of the original stop member can be reduced, reducing the overall weight. At the same time, the stop member slides smoothly, ensuring the detection accuracy of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural diagram of the steering gear mentioned in the background technology;
[0013] Figure 2 A schematic structural diagram of the rear wheel steering limit structure proposed in an embodiment of the present utility model;
[0014] Figure 3 A schematic diagram of a limiting sleeve of a limiting structure for a rear wheel steering gear proposed in an embodiment of the present utility model;
[0015] Figure 4 This is a schematic structural diagram of the rear wheel steering gear proposed in an embodiment of the present utility model.
[0016] The marks in the drawings are: 1. screw rod; 11. first limiting plane; 12. first curved surface; 2. housing; 3. limiting sleeve; 31. second limiting plane; 32. second curved surface; 33. gap; 4. dust cover; 5. drive assembly; 6. clamp; 7. displacement sensor. DETAILED DESCRIPTION
[0017] The present application will be further described in detail below with reference to the accompanying drawings and examples.
[0018] like Figure 2 As shown, this embodiment discloses a rear wheel steering gear limiting structure, including a screw 1, a housing 2 and a limiting sleeve 3, wherein the outer peripheral wall of the limiting sleeve 3 is fixedly connected to the inner peripheral wall of the housing 2, and the inner peripheral wall of the limiting sleeve 3 is coaxially slidably arranged with the screw 1, the transverse diameter of the limiting sleeve 3 is smaller than the vertical diameter, and the transverse diameter of the screw 1 is smaller than the vertical diameter; or the vertical diameter of the limiting sleeve 3 is smaller than the transverse diameter, and the vertical diameter of the screw 1 is smaller than the transverse diameter. The limiting sleeve is a special-shaped structure, and the shape of the screw 1 is consistent with that of the limiting sleeve 3, so that the screw 1 and the limiting sleeve 3 are only axially slidingly connected, preventing the screw 1 from rotating. During the movement of the screw 1, the collision between the original limiting member 1-3 and the housing 2 can be effectively avoided, reducing noise, and the size and material of the original limiting member 1-3 and the limiting member 1-5 can be lightweight, reducing the overall weight. At the same time, the displacement sensor 7 located above the limiting member 1 - 3 can output a more accurate displacement signal during the smooth sliding of the limiting member 1 - 3 and the limiting member 1 - 5 .
[0019] like Figure 2 As shown, the screw rod 1 is provided with a first limiting plane 11, which is symmetrically arranged on both sides of the screw rod 1. The limiting sleeve 3 is provided with a second limiting plane 31 that slides with the first limiting plane 11, and the second limiting plane 31 is symmetrically arranged on both sides of the limiting sleeve 3. The screw rod 1 has a first curved surface 12, and the limiting sleeve 3 has a second curved surface 32 that slides with the first curved surface 12. The first curved surface 12 is spaced apart from the first limiting plane 11, and the second curved surface 32 is spaced apart from the second limiting plane 31. The first limiting plane 11 and the second limiting plane 31 are respectively rectangular surfaces or conical surfaces. The rectangular first limiting plane 11 and the second limiting plane 31 play a guiding and limiting role.
[0020] like Figure 3 As shown, the limiting sleeve 3 is pressed into the inner wall of the shell 2 with interference, and the second curved surface 32 is provided with a gap 33. The outer diameter of the limiting sleeve 3 is slightly larger than the inner diameter of the corresponding position of the shell 2. Only in this way can a better interference pressing effect be achieved. The setting of the gap 33 enables the limiting sleeve 3 to be pressed into the interior of the shell 2. The limiting sleeve 3 is made of a rigid material, and the inner wall of the limiting sleeve 3 is coated with a wear-resistant self-lubricating material, such as polytetrafluoroethylene. The limiting sleeve 3 made of a rigid material has good strength, and the polytetrafluoroethylene coated on the surface has good wear resistance, and reduces the noise generated by sliding between the screw rod 1 and the limiting sleeve 3.
[0021] like Figure 4As shown, the present invention also discloses a rear-wheel steering gear, comprising a dust cover 4, a drive assembly 5, and a rear-wheel steering gear limiting structure. The drive assembly 5 is coupled to the screw rod 1, and the housing 2 is connected to the dust cover 4. A clamp 6 is also included. The outer peripheral wall of the housing 2 is provided with a groove, and the clamp 6 presses the dust cover 4 into the groove. The dust cover 4 is made of rubber, and the clamp 6 securely connects the dust cover 4 to the housing 2 through the groove.
[0022] It is understandable that the specific embodiments described above are only used to explain the relevant utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not have contradictions or conflicts. Any equivalent structural transformation made using the contents of the description and drawings of this utility model, directly or indirectly used in other related technical fields, are also included in the protection scope of this utility model.
Claims
1. A rear wheel steering gear limiting structure, characterized in that: It includes a screw rod, a shell and a limiting sleeve, the outer peripheral wall of the limiting sleeve is fixedly connected to the inner peripheral wall of the shell, the inner peripheral wall of the limiting sleeve is coaxially slidably arranged with the screw rod, the transverse diameter of the limiting sleeve is smaller than the vertical diameter, and the transverse diameter of the screw rod is smaller than the vertical diameter; or the vertical diameter of the limiting sleeve is smaller than the transverse diameter, and the vertical diameter of the screw rod is smaller than the transverse diameter.
2. The rear wheel steering gear limiting structure according to claim 1, characterized in that: The screw rod is provided with a first limiting plane, which is symmetrically arranged on both sides of the screw rod. The limiting sleeve is provided with a second limiting plane that slides with the first limiting plane, which is symmetrically arranged on both sides of the limiting sleeve.
3. The rear wheel steering gear limiting structure according to claim 2, characterized in that: The screw rod has a first arcuate surface, and the limiting sleeve has a second arcuate surface that slides with the first arcuate surface. The first arcuate surface is spaced apart from the first limiting plane, and the second arcuate surface is spaced apart from the second limiting plane.
4. The rear wheel steering gear limiting structure according to claim 3, characterized in that: The limiting sleeve is pressed into the inner peripheral wall of the shell with interference fit, and a gap is provided on the second arc surface.
5. The rear wheel steering gear limiting structure according to claim 1, characterized in that: The limiting sleeve is made of a rigid material, and the inner peripheral wall of the limiting sleeve is coated with a wear-resistant self-lubricating material.
6. A rear wheel steering gear, characterized in that: It comprises a dust cover, a drive assembly and the rear wheel steering gear limiting structure according to any one of claims 1 to 5, the drive assembly is cooperatively connected with the screw rod, and the dust cover is connected with the shell.
7. The rear wheel steering gear according to claim 6, characterized in that: It also includes a clamp, and the outer peripheral wall of the shell is provided with a groove, and the clamp presses the dust cover into the groove.