Rear wheel steering and anti-rotation mechanism

Abstract

This utility model discloses a rear wheel steering system and an anti-rotation mechanism, including a support plate, a limiting rod, and a limiting block for sliding engagement with a groove in the steering housing. The limiting rod has a first end for connecting to a steering screw and a second end coaxially arranged with the first end. The second end is detachably connected to the support plate. The top surface of the support plate has a groove for mounting a sensor chip. The outer peripheral wall of the limiting rod has a step located between the first and second ends. The inner wall of the limiting block has a groove that engages with the step. The outer wall of the limiting block is used for sliding engagement with the groove in the steering housing. The limiting rod and the limiting block limit the travel of the steering screw within the groove, suppressing circumferential rotation of the steering screw and preventing steering command distortion caused by screw rotation, which could affect driving safety. Simultaneously, it ensures axial movement of the sensor chip mounted on the support plate, keeping the sensor chip's displacement trajectory parallel to the sensor detection surface, thus ensuring the accuracy of the displacement signal.

Description

Technical Field

[0001] This utility model relates to the field of steering technology, specifically to a rear wheel steering system and an anti-rotation mechanism. Background Technology

[0002] To improve vehicle cornering agility, straight-line stability, and ride comfort, rear-wheel steering technology has been widely used in vehicle steering systems. This technology typically employs a trapezoidal thread transmission mechanism with self-locking properties as the core transmission component of the rear-wheel steering system. However, in practical applications, it is crucial to ensure that this transmission mechanism can only move axially and not rotate circumferentially. If the transmission mechanism rotates circumferentially, it will directly lead to distorted steering commands, increasing the risk of loss of vehicle control. Furthermore, since the rear-wheel steering system relies on linear displacement sensors to detect axial displacement signals, the rotational tendency of the transmission mechanism will interfere with the accuracy of signal acquisition. Therefore, there is an urgent need for an anti-rotation mechanism that can eliminate the circumferential degree of freedom of the transmission mechanism. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model proposes a rear wheel steering system and an anti-rotation mechanism. The limiting rod and the limiting block limit the travel of the steering screw within the groove, suppressing the circumferential rotation of the steering screw and preventing steering command distortion caused by screw rotation.

[0004] The technical solution adopted by this utility model is as follows: an anti-rotation mechanism includes a support plate, a limiting rod, and a limiting block for slidingly engaging with a groove in a steering housing. The limiting rod has a first end for connecting to a steering screw and a second end coaxially arranged with the first end. The second end is detachably connected to the support plate. The top surface of the support plate is provided with a groove for installing a sensor chip. The outer peripheral wall of the limiting rod is provided with a step, which is located between the first end and the second end. The inner wall of the limiting block is provided with a slot that engages with the step.

[0005] Optionally, the limiting block includes a first limiting shell and a second limiting shell. The first limiting shell has a first arc-shaped cavity, and the second limiting shell has a second arc-shaped cavity. The first limiting shell and the second limiting shell together form the slot. The first limiting shell has a limiting hole, and the second limiting shell has a limiting post that is inserted into the limiting hole.

[0006] Optionally, the outer peripheral wall of the step is provided with an O-ring, and the groove wall of the slot is provided with an annular groove that mates with the O-ring.

[0007] Optionally, the number of steps on the limiting rod is at least two, and a limiting groove is formed between two adjacent steps. The bottom wall of the groove on the inner wall of the limiting block is provided with a limiting protrusion that cooperates with the limiting groove.

[0008] Optionally, the first limiting shell is provided with a plurality of oil tanks for storing grease on the side opposite to the second limiting shell and / or the second limiting shell is provided with a side opposite to the first limiting shell.

[0009] Optionally, the support plate has multiple connecting rods on the side opposite to the groove. The multiple connecting rods are spaced apart around the circumference of the support plate. The free end of the connecting rod is provided with a hook, and the second end is provided with a retaining ring that cooperates with the hook.

[0010] Optionally, one side wall of the support plate is provided with a protrusion and a notch, the protrusion and the notch are spaced apart, the bottom surface of the notch is not lower than the bottom surface of the groove, and the protrusion extends into the groove.

[0011] This utility model also discloses a rear wheel steering system, including a steering housing, a steering screw, and the anti-rotation mechanism described above. The steering housing is provided with a sliding groove. The side of the first limiting shell opposite to the second limiting shell slides against the groove wall on one side. The side of the second limiting shell opposite to the first limiting shell slides against the groove wall on the other side. The first end of the limiting rod is fixedly connected to the steering screw.

[0012] Optionally, the steering housing is equipped with a displacement sensor, the displacement sensor covers the groove, and a sensing chip that cooperates with the displacement sensor is installed in the groove.

[0013] The beneficial effects of this utility model are: the outer wall of the limiting block is used to slide in conjunction with the groove of the steering housing, the limiting rod and the limiting block limit the movement stroke of the steering screw within the groove, suppress the circumferential rotation of the steering screw, avoid the distortion of steering commands caused by the rotation of the screw, eliminate the risk of vehicle loss of control, and at the same time ensure that the sensing chip mounted on the support plate moves axially, so that the displacement trajectory of the sensing chip is always parallel to the sensor detection surface, and ensure the accuracy of the displacement signal. Attached Figure Description

[0014] Figure 1 This is an exploded view of the anti-rotation mechanism proposed in an embodiment of this utility model;

[0015] Figure 2 This is a cross-sectional view of the anti-rotation mechanism proposed in an embodiment of the present utility model;

[0016] Figure 3 This is a schematic diagram of the limiting block of the anti-rotation mechanism proposed in an embodiment of the present utility model;

[0017] Figure 4 This is a schematic diagram of the rear wheel steering system proposed in an embodiment of the present invention.

[0018] The markings in the attached figures are as follows: 1. Support plate; 2. Limiting rod; 3. Groove; 4. First end; 5. Second end; 6. Step; 7. Slot; 8. First limiting shell; 9. Second limiting shell; 10. First arc-shaped cavity; 11. Second arc-shaped cavity; 12. Limiting hole; 13. Limiting post; 14. O-ring; 15. Annular groove; 16. Oil groove; 17. Connecting rod; 18. Hook; 19. Snap ring; 20. Notch; 21. Steering housing; 22. Slide groove; 23. Displacement sensor; 24. Sensing chip; 25. Steering screw; 26. Protrusion; 27. Limiting groove; 28. Limiting protrusion. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0020] like Figures 1 to 4 As shown, this embodiment discloses an anti-rotation mechanism, including a support plate 1, a limiting rod 2, and a limiting block for sliding engagement with a groove 22 of a steering housing 21. The limiting rod 2 has a first end 4 for connecting to a steering screw 25 and a second end 5 coaxially arranged with the first end 4. The second end 5 is detachably connected to the support plate 1. The top surface of the support plate 1 is provided with a groove 3 for mounting a sensor chip 24. The outer peripheral wall of the limiting rod 2 is provided with a step 6, which is located between the first end 4 and the second end 5. The inner wall of the limiting block is provided with a slot 7 that engages with the step 6. The outer wall of the limiting block is used for sliding engagement with the groove 22 of the steering housing 21. The limiting rod 2 and the limiting block limit the movement stroke of the steering screw 25 within the groove 22, suppressing circumferential rotation of the steering screw, avoiding steering command distortion caused by screw rotation, eliminating the risk of vehicle loss of control, and ensuring axial movement of the sensor chip 24 mounted on the support plate 1, so that the displacement trajectory of the sensor chip 24 always remains parallel to the sensor detection surface, ensuring the accuracy of the displacement signal. The number of steps 6 and slots 7 can be multiple, with each step 6 and slot 7 corresponding and engaging one-to-one. The limiting rod 2 has at least two steps 6, with a limiting groove 27 formed between two adjacent steps 6. The bottom wall of the slot 7 on the inner wall of the limiting block is provided with a limiting protrusion 28 that mates with the limiting groove 27. The nested structure of the limiting protrusion 28 and the limiting groove 27 prevents the limiting block from axially shifting, improving the reliability of the anti-rotation mechanism.

[0021] like Figure 1 and 3 As shown, the limiting block includes a first limiting shell 8 and a second limiting shell 9. The first limiting shell 8 has a first arc-shaped cavity 10, and the second limiting shell 9 has a second arc-shaped cavity 11. The first limiting shell 8 and the second limiting shell 9 together form the slot 7. The first limiting shell 8 has a limiting hole 12, and the second limiting shell 9 has a limiting post 13 that is inserted into the limiting hole 12. The limiting post 13 is inserted into the limiting hole 12, and the first arc-shaped cavity 10 and the second arc-shaped cavity 11 together form the slot 7.

[0022] like Figure 1 and 2 As shown, the outer peripheral wall of the step 6 is provided with an O-ring 14, and the groove wall of the slot 7 is provided with an annular groove 15 that mates with the O-ring 14. The fitting clearance between the first limiting shell 8, the second limiting shell 9 and the steering shell 21 can be adjusted by the elasticity of the O-ring itself.

[0023] like Figure 1 As shown, the first limiting shell 8 is provided with a plurality of oil grooves 16 for storing grease on the side opposite to the second limiting shell 9 and / or the second limiting shell 9 is provided with a side opposite to the first limiting shell 8. The oil grooves 16 are used to store grease, which can increase the lubrication between the limiting block and the steering housing 21, ensuring that the limiting block slides smoothly against the first sliding groove and avoiding the generation of noise.

[0024] like Figure 1 As shown, the support plate 1 has multiple connecting rods 17 on the side opposite to the groove 3. The multiple connecting rods 17 are spaced apart around the circumference of the support plate 1. The free end of each connecting rod 17 has a hook 18, and the second end 5 has a retaining ring 19 that cooperates with the hook 18. This allows for quick assembly and disassembly of the support plate and the limiting rod, facilitating the maintenance and replacement of the sensing chip.

[0025] like Figure 1 As shown, one side wall of the support plate 1 is provided with a protrusion 26 and a notch 20, the protrusion and the notch 20 are spaced apart, the bottom surface of the notch 20 is not lower than the bottom surface of the groove 3, and the protrusion 26 extends toward the groove 3. The notch 20 facilitates the installation or removal of the sensing chip 24, and the protrusion 26 extends toward the groove 3 to fix the sensing chip 24 in the groove 3.

[0026] like Figure 4 As shown, this utility model also discloses a rear wheel steering system, including a steering housing 21, a steering screw, and the aforementioned anti-rotation mechanism. The steering housing 21 is provided with a groove 22. The side of the first limiting shell 8 opposite to the second limiting shell 9 slides against one side wall of the groove 22, and the side of the second limiting shell 9 opposite to the first limiting shell 8 slides against the other side wall of the groove 22. The first end 4 of the limiting rod 2 is fixedly connected to the steering screw 25. Through the sliding constraint between the anti-rotation mechanism and the groove 22, pure linear motion control of the steering screw 25 is achieved within a compact space. The outer peripheral wall of the first end 4 of the limiting rod 2 may be threaded and threadedly connected to the steering screw.

[0027] like Figure 4As shown, a displacement sensor 23 is installed on the steering housing 21, and the displacement sensor 23 covers the slide groove 22. A sensing chip 24 that cooperates with the displacement sensor 23 is installed in the groove 3. The sensing chip 24 moves axially with the steering screw 25. The anti-rotation mechanism, the sensing chip 24, and the displacement sensor 23 form a high-precision displacement detection system, which eliminates the signal error caused by the misalignment of the sensing chip 24 and comprehensively improves the reliability of steering control.

[0028] It is understood that the specific embodiments described above are merely for explaining the relevant utility model and not for limiting the utility model. It should also be noted that, for ease 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 contradict or conflict with each other. All equivalent structural transformations made based on the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly included within the protection scope of this utility model.

Claims

1. An anti-rotation mechanism, characterized in that, The device includes a support plate, a limiting rod, and a limiting block for sliding engagement with a groove in the steering housing. The limiting rod has a first end for connecting to a steering screw and a second end coaxially arranged with the first end. The second end is detachably connected to the support plate. The top surface of the support plate is provided with a groove for installing a sensor chip. The outer peripheral wall of the limiting rod is provided with a step, which is located between the first end and the second end. The inner wall of the limiting block is provided with a groove that engages with the step.

2. The anti-rotation mechanism according to claim 1, characterized in that, The limiting block includes a first limiting shell and a second limiting shell. The first limiting shell has a first arc-shaped cavity, and the second limiting shell has a second arc-shaped cavity. The first limiting shell and the second limiting shell together form the slot. The first limiting shell has a limiting hole, and the second limiting shell has a limiting post that is inserted into the limiting hole.

3. The anti-rotation mechanism according to claim 1, characterized in that, The outer peripheral wall of the step is provided with an O-ring, and the groove wall of the slot is provided with an annular groove that mates with the O-ring.

4. The anti-rotation mechanism according to claim 1, characterized in that, The limiting rod has at least two steps, and a limiting groove is formed between two adjacent steps. The bottom wall of the groove on the inner wall of the limiting block is provided with a limiting protrusion that cooperates with the limiting groove.

5. The anti-rotation mechanism according to claim 2, characterized in that, The first limiting shell is provided with multiple oil tanks for storing grease on the side opposite to the second limiting shell and / or the second limiting shell is provided with the side opposite to the first limiting shell.

6. The anti-rotation mechanism according to claim 1, characterized in that, The support plate has multiple connecting rods on the side opposite to the groove. The multiple connecting rods are spaced apart along the circumference of the support plate. The free end of the connecting rod is provided with a hook, and the second end is provided with a retaining ring that cooperates with the hook.

7. The anti-rotation mechanism according to claim 1, characterized in that, The support plate has a protrusion and a notch on one side wall, the protrusion and the notch are spaced apart, the bottom surface of the notch is not lower than the bottom surface of the groove, and the protrusion extends into the groove.

8. A rear-wheel steering system, characterized in that, The device includes a steering housing, a steering screw, and an anti-rotation mechanism as described in any one of claims 2 to 7. The steering housing is provided with a sliding groove. The side of the first limiting shell opposite to the second limiting shell slides against one side wall of the sliding groove. The side of the second limiting shell opposite to the first limiting shell slides against the other side wall of the sliding groove. The first end of the limiting rod is fixedly connected to the steering screw.

9. The rear wheel steering system according to claim 8, characterized in that, The steering housing is equipped with a displacement sensor, which covers the groove, and a sensing chip that cooperates with the displacement sensor is installed in the groove.

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