Integrated rear wheel steering system sensing device

Abstract

The utility model discloses an integrated rear wheel steering system induction device which comprises a rear wheel steering machine shell installed at the position of a rear axle, and a lead screw coaxially arranged with the rear wheel steering machine shell is installed in the rear wheel steering machine shell. A rotating locking mechanism which can enable the lead screw to only do axial movement during left-right translation movement is vertically installed in the middle of a connecting shaft of the lead screw, and a displacement sensing device used for collecting the axial position of the lead screw in real time is installed at the top of the rotating locking mechanism. By means of the integrated design scheme, a rotation locking device of the lead screw and a lead screw position sensing device are integrated together, two functions are achieved, meanwhile, the number of parts is reduced, the structure is more compact, and whole vehicle arrangement of a rear steering system on different vehicle types is facilitated.

Description

Technical Field

[0001] This utility model relates to a rear wheel steering system device, specifically an integrated rear wheel steering system sensing device, belonging to the field of automotive parts processing technology. Background Technology

[0002] In existing technologies, according to the applicant's understanding, rear-wheel steering systems generally use a lead screw drive mechanism to convert the driving torque of the motor's rotation into the axial movement of the lead screw, thereby driving the rear wheels to move left and right and achieving the steering function of the rear wheels. To achieve the axial movement of the lead screw, a rotation locking mechanism is needed to prevent the lead screw from rotating, ensuring that the lead screw can only move axially. Simultaneously, to accurately control the steering angle of the rear wheels, a displacement sensor is installed on the lead screw drive mechanism to collect the axial position of the lead screw in real time. To the applicant's understanding, current designs often have a separate structure for the rotation locking mechanism and the sensing device, with two separate mechanisms performing the corresponding functions, resulting in an excessively large overall structure and installation difficulties. Utility Model Content

[0003] The purpose of this utility model is to address the problems existing in the prior art by providing a rotary locking mechanism with a reasonable structure and convenient use. This mechanism integrates the rotary locking and sensing functions into one integrated structure, making the overall structure more compact and easier to arrange in the vehicle.

[0004] To achieve the above objectives, the specific technical solution of this utility model is as follows: An integrated rear wheel steering system sensing device includes a rear wheel steering gear housing installed at the rear axle position. A lead screw is installed coaxially inside the rear wheel steering gear housing. A rotation locking mechanism that enables the lead screw to only move axially when it moves left and right is vertically installed at the middle of the connecting shaft of the lead screw. A displacement sensing device for real-time acquisition of the axial position of the lead screw is installed on the top of the rotation locking mechanism.

[0005] Furthermore, the lead screw has a threaded hole, and the bottom of the rotation locking mechanism is threadedly connected to the lead screw.

[0006] Furthermore, the rotation locking mechanism includes a rotation locking element, an O-ring, and a slider; the lower end of the rotation locking element has a thread that mates with a lead screw and is threadedly connected to the lead screw; the other end of the rotation locking element is fixedly engaged with the inner hole of the slider; the O-ring is fitted onto the rotation locking element.

[0007] The rotating locking element is cylindrical in shape and consists of a fixed section at the top, a connecting section in the middle, and a threaded section at the bottom, all three of which are coaxially arranged. The threaded section at the bottom is provided with external threads, which are rotatably connected with the internal threads of the lead screw to form a threaded pair.

[0008] The middle connecting section is a smooth shaft end, which is embedded in the guide sliding groove. The connection between the middle section and the upper fixed section has a fixed annular groove for installing an O-ring. The O-ring is fitted into the fixed annular groove and protrudes from the outer surface of the rotating locking element to eliminate the clearance between the rotating locking element and the slider.

[0009] The upper fixed section is interference-fitted with the inner hole of the slider to ensure that the rotation locking element is rigidly connected to the slider and moves synchronously.

[0010] Furthermore, the housing is provided with a guide sliding groove along the axial direction of the lead screw, and the slider is embedded in the guide sliding groove.

[0011] Furthermore, the slider has a cuboid structure, and its two sides in contact with the guide sliding groove are respectively provided with oil storage grooves for lubrication when the slider moves axially in the sliding groove of the housing; the upper surface of the slider is symmetrically provided with elongated slots for installing displacement sensing devices.

[0012] Furthermore, the displacement sensing device consists of a position sensing element and a position sensor. The position sensor is mounted on the steering gear housing by fixing bolts, and the position sensing element is electrically connected to the position sensor.

[0013] Furthermore, the position sensing element is placed on the upper surface of the slider, and its sides are bent downwards to form sides that mate with the elongated slots of the slider. Each side has at least one fixing hole to prevent the position sensing element from falling off during vehicle operation. Simultaneously, the tight fit and fixed position of the slider and the rotation locking element better ensures the stability of the gap between the position sensing element and the position sensor, thereby guaranteeing the stability of the lead screw position signal.

[0014] The significant advancement of this invention compared to the prior art is that it integrates the lead screw rotation locking device and the lead screw position sensing device into an integrated design scheme. While achieving both functions, it reduces the number of parts, resulting in a more compact structure and facilitating the overall vehicle layout of the rear-wheel steering system on different vehicle models. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the rear wheel steering system of this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of this utility model.

[0018] Figure 3 This is a cross-sectional view of the present invention.

[0019] Figure 4 This is a schematic diagram of the rotating locking mechanism of this utility model.

[0020] Figure 5 This is a schematic diagram showing the connection between the position sensing plate and the slider of this utility model.

[0021] Figure 6 This is a schematic diagram of the rotating locking element of this utility model.

[0022] Figure description: 1-Rear wheel steering gear housing, 2-Position sensor, 3-Position sensing plate, 4-Slider, 5-O-ring, 6-Rotation locking element, 7-Lead screw. Detailed Implementation

[0023] This embodiment provides an integrated rear-wheel steering system sensing device, the structure of which is as follows: Figures 1 to 5 As shown, it includes a rear wheel steering gear housing 1, a position sensor 2, a position sensing plate 3, a slider 4, an O-ring 5, a rotation locking element 6, and a lead screw 7.

[0024] The rear wheel steering gear housing 1 is installed at the rear axle of the vehicle, and the lead screw 7 is installed inside the rear wheel steering gear housing and coaxially arranged therewith. The slider 4, O-ring 5, and rotation locking element 6 together constitute the rotation locking mechanism; the rotation locking mechanism ensures that the lead screw only moves axially when it moves left and right.

[0025] like Figure 6 As shown, the rotary locking element 6 consists of an upper fixed section, a middle connecting section, and a lower threaded section, all three arranged coaxially. The lower threaded section has external threads that rotatably engage with the internal threads of the lead screw, forming a threaded pair. The middle connecting section is a smooth shaft end embedded in a guide sliding groove, and its connection with the upper fixed section has a fixing annular groove for installing an O-ring. The O-ring is fitted into the fixing annular groove and protrudes from the outer surface of the rotary locking element to eliminate play between the rotary locking element and the slider. The upper fixed section has an interference fit with the inner hole of the slider, ensuring a rigid connection and synchronous movement between the rotary locking element and the slider.

[0026] Meanwhile, the housing 1 is provided with a guide sliding groove along the axial direction of the lead screw 4, and the slider 4 is embedded in the sliding groove of the housing 1. Oil storage grooves are provided on both sides of the contact surface between the slider 4 and the sliding groove of the housing 1 for lubrication when the slider 4 moves axially in the sliding groove of the housing 1. Since the O-ring 5 protrudes from the outer surface of the rotation locking element 6, the clearance between the rotation locking element 6 and the slider 4 is eliminated. By tightening the slider 4, deformation is generated to eliminate the clearance between the slider 4 and the guide sliding groove of the housing 1. The design of this device can not only play a rotation locking function when the lead screw moves left and right, but also avoid noise during the left and right reversal process by eliminating the clearance at the mating point.

[0027] Position sensor 2 and position sensing element 3 together form a position sensing device, which is mounted on top of the rotary locking element. The position sensor is mounted to the steering gear housing by fixing bolts, while the position sensing element is placed on the upper surface of the slider and secured by fixing holes to prevent it from falling off. The position sensor and position sensing element are electrically connected and interact with each other, detecting the axial movement of the lead screw by adjusting the axial position of the position sensing element 3. Because the slider 4 is tightly fitted to the rotary locking element 6 and its position is fixed, the gap between the position sensing element 3 and the position sensor 2 is kept stable, ensuring the stability of the lead screw position signal.

[0028] In addition to the above-described embodiments, this utility model may have other implementations. All technical solutions employing equivalent substitutions or transformations fall within the protection scope claimed by this utility model.

Claims

1. An integrated rear-wheel steering system sensing device, characterized in that: The device includes a rear wheel steering gear housing installed at the rear axle position. Inside the rear wheel steering gear housing, a lead screw is installed coaxially with the lead screw. A rotation locking mechanism is vertically installed at the middle of the connecting shaft of the lead screw, which enables the lead screw to move only axially when it moves left and right. A displacement sensing device for real-time acquisition of the axial position of the lead screw is installed on the top of the rotation locking mechanism.

2. The integrated rear wheel steering system sensing device according to claim 1, characterized in that: The lead screw has a threaded hole, and the bottom of the rotating locking mechanism is threadedly connected to the lead screw.

3. The integrated rear wheel steering system sensing device according to claim 2, characterized in that: The rotation locking mechanism includes a rotation locking element, an O-ring, and a slider; the lower end of the rotation locking element is threaded to a lead screw, and the upper end is fixed to the inner hole of the slider; the O-ring is fitted onto the rotation locking element.

4. The integrated rear wheel steering system sensing device according to claim 3, characterized in that: The rotating locking element is cylindrical in shape and consists of a fixed section at the top, a connecting section in the middle, and a threaded section at the bottom, all three of which are coaxially arranged. The outer surface of the lower threaded section is provided with external threads, which are rotatably connected with the internal threads of the lead screw to form a threaded pair; The middle connecting section is a smooth shaft end, which is embedded in the guide sliding groove. The connection between the middle section and the upper fixed section has a fixed annular groove for installing O-rings. The upper fixed section is interference-fitted with the inner hole of the slider to ensure that the rotation locking element is rigidly connected to the slider and moves synchronously.

5. The integrated rear wheel steering system sensing device according to claim 3, characterized in that: The housing is provided with a guide sliding groove along the axial direction of the lead screw, and the slider is embedded in the guide sliding groove.

6. The integrated rear-wheel steering system sensing device according to claim 3, characterized in that: The slider has a cuboid structure, and oil reservoirs are respectively provided on the two sides that contact the guide sliding groove for lubrication when the slider moves axially in the sliding groove of the housing. The upper surface of the slider is symmetrically provided with elongated slots for mounting displacement sensing devices.

7. The integrated rear wheel steering system sensing device according to claim 3, characterized in that: The O-ring is fitted into the fixed annular groove and protrudes from the outer surface of the rotation locking element.

8. The integrated rear wheel steering system sensing device according to claim 1, characterized in that: The displacement sensing device consists of a position sensing element and a position sensor. The position sensor is mounted on the steering gear housing by fixing bolts, and the position sensing element is electrically connected to the position sensor.

9. The integrated rear wheel steering system sensing device according to claim 8, characterized in that: The position sensing plate is placed on the upper end face of the slider, and is bent downward along both sides to form side edges that match the elongated slots of the slider, and each side edge is provided with at least one fixing hole.

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