Anti-rotation and clearance compensation mechanism for vehicle rear wheel steering gear

Abstract

The utility model discloses an anti-rotation and backlash compensation mechanism for a vehicle rear wheel steering gear, which comprises a limit screw, an annular groove I and an annular groove II are arranged on the limit screw at intervals, the annular groove I, the annular groove II and the limit screw are coaxial, the limit screw is provided with a screw head, and the screw head is provided with an annular groove I and an annular groove II. The distance between the second annular groove and the screw head is smaller than the distance between the first annular groove and the screw head. The O-shaped ring is tightly sleeved with the first annular groove and is coaxial with the limiting screw, and the outer side of the O-shaped ring is located outside the first annular groove. The anti-rotation and clearance compensation mechanism has the beneficial effects that in the working process of the anti-rotation and clearance compensation mechanism for the vehicle rear wheel steering gear, the O-shaped ring compensates a gap which is deformed due to the rotation torque from the transmission push rod and the axial impact force of the limiting screw, so that the accuracy of the induction stroke of the induction sheet is improved; the method is very suitable for rotation prevention and clearance compensation of the eddy current displacement sensor based on the eddy current effect.

Description

Technical Field

[0001] This utility model relates to the automotive field, and in particular to an anti-rotation and clearance compensation mechanism for the rear wheel steering system of a vehicle. Background Technology

[0002] With the development of the automotive industry and the increasing demands for handling performance, rear-wheel steering technology has gradually emerged. It adjusts the steering angle of the rear wheels in real time according to different driving speeds and operating conditions, improving driving stability and reducing the risk of roll and fishtailing at high speeds, while significantly reducing the turning radius and enhancing vehicle agility at low speeds.

[0003] When the rear wheels are steering, the controller receives signals such as the front wheel angle and vehicle speed, and controls the motor to output torque. This torque is amplified and reduced through large and small pulleys and a belt system, causing the trapezoidal nut to rotate. The rotational torque is converted into axial thrust from the trapezoidal lead screw, which is then output to the tie rod or fork via the transmission push rod, causing the wheels to rotate at a certain angle. The trapezoidal lead screw and transmission push rod anti-rotation mechanism are important components of the vehicle's rear wheel steering system. During the rotation of the trapezoidal nut, the trapezoidal lead screw and transmission push rod rotate radially, thus affecting the travel sensing.

[0004] Currently, the anti-rotation and clearance compensation mechanisms for vehicle rear wheel steering systems are mainly divided into two types: separate and integrated. In the separate design, the stroke sensing mechanism and the angle limiting mechanism are made separately, requiring two openings in the steering gear housing. This results in a large space occupation, a bulky assembly structure, and numerous components. Furthermore, it affects production cycle and efficiency during industrialization, leading to high costs. In the integrated design, the stroke sensing mechanism and the angle limiting mechanism are combined into one. However, this mechanism suffers from radial rotation of the pushrod and non-axial impact, causing the sensing element to shift, thus affecting the stroke sensing accuracy of the eddy current displacement sensor. It also requires higher precision in housing processing, increasing the difficulty of installation and making the process more complicated. Utility Model Content

[0005] The main purpose of this utility model is to propose an anti-rotation and clearance compensation mechanism for the rear wheel steering system of a vehicle, which aims to solve the problems of low stroke sensing accuracy and complicated installation of the existing integrated anti-rotation and clearance compensation mechanism for the rear wheel steering system of a vehicle.

[0006] To address the aforementioned problems, this utility model proposes an anti-rotation and clearance compensation mechanism for a vehicle rear wheel steering system, comprising:

[0007] A limiting screw, wherein the limiting screw is provided with annular groove one and annular groove two at intervals, the annular groove one, the annular groove two and the limiting screw are coaxial, the limiting screw has a screw head, and the distance between the annular groove two and the screw head is less than the distance between the annular groove one and the screw head.

[0008] An O-ring is tightly fitted into an annular groove and is coaxial with a limiting screw, with the outer side of the O-ring located outside the annular groove.

[0009] A pair of limiting blocks, each with a half-hole and a half-ring on its wall. When the pair of limiting blocks are fastened together, the half-holes form a circular hole and the half-rings form a circular ring. One end of the screw head of the limiting screw is located in the circular hole and is in close contact with the hole wall. The circular ring is located in the second annular groove and is in close contact with the groove wall of the second annular groove and the upper surface of the O-ring. A slot is provided on the upper end of the outer side of the limiting block.

[0010] The sensing sheet has two ends bent in the same direction to form a pair of elastic bending pieces, which are inserted into the slots to fix the sensing sheet on the upper surface of the limiting block.

[0011] In one embodiment, the bottom surfaces of the annular groove one and the annular groove two are arc surfaces.

[0012] In one embodiment, along the axial direction of the limiting screw, the upper edge of the annular groove one and the lower edge of the annular groove two are collinear.

[0013] In one embodiment, the limiting screw is provided with a shoulder, the shoulder is located at the lower end of the annular groove, and the lower end of the O-ring abuts against the shoulder.

[0014] In one embodiment, the upper surface of the O-ring is elastically deformed by the compression of the ring.

[0015] In one embodiment, a pair of limiting blocks are fitted onto a limiting screw and are symmetrically distributed around the limiting screw, with the circular hole, the circular ring, and the limiting screw being coaxial.

[0016] In one embodiment, a pair of limiting blocks are respectively provided with a pin and a socket, wherein the pin is tightly inserted into the socket to fasten the pair of limiting blocks together and lock them onto the limiting screw.

[0017] Beneficial effects:

[0018] 1. In the anti-rotation and clearance compensation mechanism for a vehicle rear wheel steering system of this utility model, the limiting block, limiting screw, and O-ring form a soft interference fit in the lateral direction. The O-ring, by utilizing its deformation, can effectively reduce the pressing force when assembling the anti-rotation and clearance compensation mechanism for a vehicle rear wheel steering system of this utility model, reducing installation difficulty and making installation simple and convenient, while also reducing damage to the limiting block during installation. In addition, during the operation of the anti-rotation and clearance compensation mechanism for a vehicle rear wheel steering system of this utility model, the O-ring compensates for the clearance caused by the rotational torque from the transmission push rod and the axial impact force of the limiting screw, improving the accuracy of the sensing stroke of the sensing element. It is very suitable for anti-rotation and clearance compensation of eddy current displacement sensors based on the eddy current effect.

[0019] 2. In the anti-rotation and clearance compensation mechanism for the rear wheel steering gear of this utility model, after a pair of limiting blocks are assembled, the guiding effect of the slots on the limiting blocks makes the installation of the sensing plate more convenient, reducing the possibility of incomplete installation or lateral displacement of the sensing plate due to insufficient lateral restriction. This improves the pass rate of installation of the anti-rotation and clearance compensation mechanism for the rear wheel steering gear of this utility model, reduces the installation difficulty, makes the installation simple and convenient, and improves the accuracy of the sensing stroke of the sensing plate. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the anti-rotation and clearance compensation mechanism for the rear wheel steering system of a vehicle according to the present invention;

[0022] Figure 2 yes Figure 1 Schematic diagram after removing one limit block Figure 1 ;

[0023] Figure 3 yes Figure 1 Schematic diagram after removing one limit block Figure 2 ;

[0024] Figure 4 This is an exploded view of an anti-rotation and clearance compensation mechanism for a vehicle rear wheel steering system according to this utility model.

[0025] Figure 5 This is a schematic diagram of the installation of an anti-rotation and clearance compensation mechanism for a vehicle rear wheel steering system according to this utility model. Figure 1 ;

[0026] Figure 6 This is a schematic diagram of the installation of an anti-rotation and clearance compensation mechanism for a vehicle rear wheel steering system according to this utility model. Figure 2 .

[0027] The annotations in the attached figures are explained as follows:

[0028] 1. Limiting screw; 2. Annular groove one; 3. Annular groove two; 4. O-ring; 5. Limiting block; 6. Slot; 7. Sensing plate; 8. Half hole; 9. Half ring; 10. Screw head; 11. Elastic bending plate; 12. Insertion hole; 13. Pin; 14. Transmission push rod; 15. Housing; 16. Eddy current displacement sensor; 17. Shoulder. Detailed Implementation

[0029] 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.

[0030] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] This invention proposes an anti-rotation and clearance compensation mechanism for a vehicle rear wheel steering system. In this mechanism, the limiting block 5, the limiting screw 1, and the O-ring 4O form a soft interference fit in the lateral direction. The O-ring 4O, by utilizing its deformation, effectively reduces the pressing force during assembly, simplifying installation and minimizing damage to the limiting block 5. Furthermore, during operation, the O-ring 4O compensates for the clearance caused by the rotational torque from the transmission push rod 14 and the axial impact force of the limiting screw 1, improving the accuracy of the sensing stroke of the sensing element 7. This mechanism is highly suitable for anti-rotation and clearance compensation of eddy current displacement sensors 16 based on the eddy current effect.

[0034] Furthermore, in the anti-rotation and clearance compensation mechanism for the rear wheel steering gear of this utility model, after a pair of limiting blocks 5 are assembled, the guiding effect of the slot 6 on the limiting block 5 makes the installation of the sensing piece 7 more convenient, reducing the possibility of incomplete installation or lateral displacement of the sensing piece 7 due to insufficient lateral restriction. This improves the pass rate of installation of the anti-rotation and clearance compensation mechanism for the rear wheel steering gear of this utility model, reduces the installation difficulty, makes installation simple and convenient, and improves the accuracy of the sensing stroke of the sensing piece 7.

[0035] Specifically, in one embodiment of the utility model, such as Figures 1-4As shown, the anti-rotation and clearance compensation mechanism for a vehicle rear wheel steering gear includes: a limiting screw 1, an O-ring 40, a pair of limiting blocks 5, and a sensing plate 7. The limiting screw 1 has an annular groove 2 and an annular groove 3 spaced apart. The annular groove 2, annular groove 3, and limiting screw 1 are coaxial. The limiting screw 1 has a screw head 10. The distance between the annular groove 3 and the screw head 10 is less than the distance between the annular groove 2 and the screw head 10. Along the axial direction of the limiting screw 1, the upper edge of the annular groove 2 and the lower edge of the annular groove 3 are collinear. This design ensures that the O-ring 40 is not too far from the annulus, affecting their contact. The O-ring 40 is tightly fitted in the annular groove 2 and coaxial with the limiting screw 1. The outer side of the O-ring 40 is located outside the annular groove 2. This design ensures that subsequent installation of the upper... After the limiting block 5 is engaged, the outer side of the ring and the O-ring 4O are pressed together. Only by pressing the ring and the O-ring 4O together can the limiting block 5, the limiting screw 1, and the O-ring 4O form a soft interference fit in the lateral direction. The deformation of the O-ring 4O can effectively reduce the pressing force when assembling the anti-rotation and clearance compensation mechanism for the rear wheel steering gear of this utility model, reduce the installation difficulty, make the installation simple and convenient, and reduce the damage to the limiting block 5 during installation. In addition, during the operation of the anti-rotation and clearance compensation mechanism for the rear wheel steering gear of this utility model, the O-ring 4O compensates for the gap caused by the rotational torque from the transmission push rod 14 and the axial impact force of the limiting screw 1, improves the accuracy of the sensing stroke of the sensing element 7, and is very suitable for the anti-rotation and clearance compensation of the eddy current displacement sensor 16 based on the eddy current effect.

[0036] In this embodiment, as Figures 2-4As shown, the limiting block 5 is provided with a half-hole 8, and a semi-ring 9 is protruding outward from the hole wall of the half-hole 8. After a pair of limiting blocks 5 are fastened together, the pair of half-holes 8 form a circular hole, and the pair of semi-rings 9 form a circular ring. One end of the screw head 10 of the limiting screw 1 is located in the circular hole and is in close contact with the hole wall. The circular ring is located in the annular groove 3 and is in close contact with the groove wall of the annular groove 3 and the upper surface of the O-ring 40. At the same time, the upper surface of the O-ring 40 is elastically deformed by the compression of the circular ring. This design enables the limiting block 5, the limiting screw 1, and the O-ring 40 to form a soft interference fit in the lateral direction. The deformation of the O-ring 4O can effectively reduce the pressing force when assembling the anti-rotation and clearance compensation mechanism for the rear wheel steering gear of this utility model, reducing the installation difficulty and making the installation simple and convenient, while reducing the damage to the limiting block 5 during installation. At the same time, during the operation of the anti-rotation and clearance compensation mechanism for the rear wheel steering gear of this utility model, the O-ring 4O compensates for the gap caused by the rotational torque from the transmission push rod 14 and the axial impact force of the limiting screw 1, improving the accuracy of the sensing stroke of the sensing element 7. It is very suitable for the anti-rotation and clearance compensation of the eddy current displacement sensor 16 based on the eddy current effect.

[0037] In this embodiment, as Figures 1-4 As shown, a pair of limiting blocks 5 are fitted onto the limiting screw 1 and are symmetrically distributed around the limiting screw 1. The circular hole, the circular ring, and the limiting screw 1 are coaxial. A pin 13 and a hole 12 are respectively provided on the pair of limiting blocks 5. The pin 13 is tightly inserted into the hole 12 so that the pair of limiting blocks 5 are fastened together and fitted onto the limiting screw 1.

[0038] Preferably, the bottom surfaces of the annular groove 2 and the annular groove 3 are arc surfaces. This design helps to ensure that the ring of the limiting block 5 is subjected to uniform force and extends its service life.

[0039] In this embodiment, further, such as Figures 1-4 As shown, the limiting screw 1 is provided with a shoulder 17, which is located at the lower end of the annular groove 2. The lower end of the O-ring 40 abuts against the shoulder 17. With this design, when the upper surface of the O-ring 40 is squeezed by the ring and undergoes elastic deformation, the O-ring 40 does not move axially, which is conducive to the stable pressing of the O-ring 40 and the ring.

[0040] In this embodiment, as Figures 1-4As shown, a slot 6 is provided on the upper end of the outer side of the limiting block 5. The two ends of the sensing piece 7 are bent in the same direction to form a pair of elastic bent pieces 11. The elastic bent pieces 11 are inserted into the slot 6 to fix the sensing piece 7 on the upper surface of the limiting block 5. After the pair of limiting blocks 5 are assembled, the guiding effect of the slot 6 on the limiting block 5 makes it easier to install the sensing piece 7, reducing the possibility of incomplete installation or lateral displacement of the sensing piece 7 due to insufficient lateral restriction. This improves the pass rate of the anti-rotation and clearance compensation mechanism for the rear wheel steering gear of the present invention, reduces the installation difficulty, makes the installation simple and convenient, and improves the accuracy of the sensing stroke of the sensing piece 7.

[0041] This embodiment describes an anti-rotation and clearance compensation mechanism for a vehicle's rear wheel steering system. During installation, if... Figure 5 and Figure 6 As shown, first, the O-ring 40 is fitted into the annular groove 2 of the limiting screw 1. Next, the two limiting blocks 5 are fastened onto the limiting screw 1, and the ring is inserted into the annular groove 3. Then, the pair of limiting blocks 5 are pinched and aligned with the threaded holes on the transmission push rod 14 and pressed into the opening of the housing 15. The limiting screw 1 is then tightened to the corresponding torque, so that the anti-rotation and clearance compensation mechanism for the rear wheel steering gear of the vehicle in this embodiment is installed and fixed onto the transmission push rod 14. Finally, the sensing plate 7 is snapped downward into the slot 6, and the eddy current displacement sensor 16 is installed. The limiting screw 1 can prevent the transmission push rod 14 from rotating.

[0042] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An anti-rotation and clearance compensation mechanism for a vehicle rear wheel steering system, characterized in that, include: A limiting screw, wherein the limiting screw is provided with annular groove one and annular groove two at intervals, the annular groove one, the annular groove two and the limiting screw are coaxial, the limiting screw has a screw head, and the distance between the annular groove two and the screw head is less than the distance between the annular groove one and the screw head. An O-ring is tightly fitted into an annular groove and is coaxial with a limiting screw, with the outer side of the O-ring located on one side of the annular groove. A pair of limiting blocks, each with a half-hole and a half-ring on its wall. When the pair of limiting blocks are fastened together, the half-holes form a circular hole and the half-rings form a circular ring. One end of the screw head of the limiting screw is located in the circular hole and is in close contact with the hole wall. The circular ring is located in the second annular groove and is in close contact with the groove wall of the second annular groove and the upper surface of the O-ring. A slot is provided on the upper end of the outer side of the limiting block. The sensing sheet has two ends bent in the same direction to form a pair of elastic bending pieces, which are inserted into the slots to fix the sensing sheet on the upper surface of the limiting block.

2. The anti-rotation and clearance compensation mechanism for a vehicle rear wheel steering system as described in claim 1, characterized in that, The bottom surfaces of the annular groove one and annular groove two are arc surfaces.

3. The anti-rotation and clearance compensation mechanism for a vehicle rear wheel steering system as described in claim 1, characterized in that, Along the axial direction of the limiting screw, the upper edge of the annular groove one and the lower edge of the annular groove two are collinear.

4. The anti-rotation and clearance compensation mechanism for a vehicle rear wheel steering system as described in claim 3, characterized in that, The limiting screw is provided with a shoulder, which is located at the lower end of the annular groove, and the lower end of the O-ring abuts against the shoulder.

5. The anti-rotation and clearance compensation mechanism for a vehicle rear wheel steering system as described in claim 1, characterized in that, The upper surface of the O-ring is elastically deformed by the compression of the ring.

6. The anti-rotation and clearance compensation mechanism for a vehicle rear wheel steering system as described in claim 1, characterized in that, A pair of limiting blocks are fitted onto the limiting screw and are symmetrically distributed around the limiting screw. The circular hole, the circular ring, and the limiting screw are coaxial.

7. The anti-rotation and clearance compensation mechanism for a vehicle rear wheel steering system as described in claim 1, characterized in that, A pair of limit blocks are respectively provided with a pin and a hole. The pin is tightly inserted into the hole so that the pair of limit blocks are fastened together and locked onto the limit screw.

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