Steering shaft and intermediate shaft yoke mistake-proofing structure

Abstract

This utility model discloses a structure for preventing misalignment between a steering shaft and an intermediate shaft fork, comprising an intermediate shaft fork and a steering shaft. An intermediate shaft mounting hole is formed on the rear end face of the intermediate shaft fork along its axial direction. An eccentric countersunk hole is formed on the outer circumference of the rear end face of the intermediate shaft fork corresponding to the intermediate shaft mounting hole, forming a stepped surface between the eccentric countersunk hole and the outer circumference of the intermediate shaft mounting hole. The longitudinal section of the steering shaft head is adapted to the structure of the intermediate shaft mounting hole, and the steering shaft head is inserted into the intermediate shaft mounting hole. A fastening groove communicating with the intermediate shaft mounting hole is formed on the outer wall of the intermediate shaft fork along its axial direction. A bolt hole perpendicular to the fastening groove is formed on the outer wall of the intermediate shaft fork's circumference, and a fastening bolt is threaded into the bolt hole, passing through the fastening groove. This utility model has the advantages of avoiding misalignment between the intermediate shaft fork and the steering shaft due to incomplete axial fit, providing good anti-misalignment effect, simple structure, and ease of processing.

Description

Technical Field

[0001] This utility model relates to the field of steering shaft technology, specifically to a steering shaft and intermediate shaft joint fork anti-misalignment structure. Background Technology

[0002] The intermediate shaft is a core transmission component of the automotive steering system, undertaking the crucial function of connecting the steering column and the steering gear. The intermediate shaft is rigidly locked to the column output shaft and steering gear gear shaft via bolted connections through an external coupling fork, ensuring efficient and precise transmission of steering torque. During assembly, due to the limited space in the vehicle body structure, operators have difficulty visually observing the bolt tightening status, resulting in assembly failures such as inadequate bolt tightening and loose connections between the intermediate shaft joint fork and the shaft. Once bolts become loose, fall off, or break, the intermediate shaft joint fork of the steering shaft will disengage from the steering shaft, leading to steering failure and potentially causing serious driving safety accidents. Patent publication number CN205706836U discloses an intermediate shaft assembly for a car steering column with a structure to prevent mis-assembly. This assembly uses a toothed spline connection to provide circumferential positioning between the steering column and the upper intermediate shaft joint fork, and between the steering gear and the lower intermediate shaft joint fork, thereby preventing mis-assembly between the intermediate shaft joint fork and the steering shaft in the circumferential direction. However, it cannot avoid the problem of loose connections caused by inadequate axial fit between the intermediate shaft joint fork and the steering shaft, resulting in poor mis-assembly prevention, a complex structure, and difficulty in processing. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a structure to prevent mis-installation of the steering shaft and intermediate shaft joint fork, so as to avoid the false connection caused by the mis-installation of the intermediate shaft joint fork and the steering shaft in the axial direction. The structure is simple and easy to process, and can effectively solve the problems in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a steering shaft and intermediate shaft fork anti-misalignment structure, comprising an intermediate shaft fork and a steering shaft, wherein the rear end face of the intermediate shaft fork is provided with an intermediate shaft mounting hole along its axial direction, and the rear end face of the intermediate shaft fork is provided with an eccentric countersunk hole at the outer circumference of the corresponding intermediate shaft mounting hole, and a stepped surface is formed between the eccentric countersunk hole and the outer circumference of the intermediate shaft mounting hole; the longitudinal section of the steering shaft head is adapted to the structure of the intermediate shaft mounting hole, and the steering shaft head is inserted into the intermediate shaft mounting hole; a fastening groove communicating with the intermediate shaft mounting hole is provided on the outer wall of the intermediate shaft fork along its axial direction, and a bolt hole perpendicular to the fastening groove is provided on the outer wall of the circumference of the intermediate shaft fork, a fastening bolt is threaded into the bolt hole, and the fastening bolt passes through the fastening groove.

[0005] Furthermore, the position of the stepped surface corresponds to that of the fastening bolt.

[0006] Furthermore, the intermediate shaft mounting hole is an elliptical hole, and the eccentric countersunk hole is an elliptical hole.

[0007] Furthermore, the head of the steering shaft is a thinned section, the longitudinal section of which is adapted to the structure of the intermediate shaft mounting hole, and the two ends of the thinned section form a stepped surface two between the rear end of the steering shaft and the rear shaft body of the steering shaft, and one side of the stepped surface two of the steering shaft abuts against the rear end face of the intermediate shaft fork.

[0008] Furthermore, the top of the thinned portion is provided with a bolt positioning groove, and the fastening bolt passes through the bolt hole and presses against the bolt positioning groove of the steering shaft.

[0009] Furthermore, the outer wall of the intermediate shaft joint fork is provided with a stress-relieving through hole located at the inner end of the fastening groove, and the stress-relieving through hole is an elliptical hole or a waist-shaped hole structure.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: This anti-misalignment structure between the steering shaft and the intermediate shaft joint fork, through the eccentric countersunk hole provided on the intermediate shaft joint fork and the positioning fit between the fastening bolt and the bolt positioning groove, avoids the false connection caused by the incomplete fit in the axial direction between the intermediate shaft joint fork and the steering shaft, and has a good anti-misalignment effect; at the same time, the stress-relieving through hole can increase the clamping tightness between the intermediate shaft joint fork and the steering shaft, prevent the bearing hole of the intermediate shaft joint fork from deforming after the fastening bolt is tightened, thereby avoiding affecting the swing torque of the intermediate shaft joint fork, improving the steering feel fluctuation and steering non-return-to-center problem; this anti-misalignment structure between the steering shaft and the intermediate shaft joint fork is easy to process and has a simple structure. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an exploded view of the present invention; Figure 3 This is a schematic diagram of the intermediate axle joint fork structure of this utility model; Figure 4 This is a rear view of the intermediate axle joint fork of this utility model; Figure 5 This is a schematic diagram of the steering shaft structure of this utility model; Figure 6 This is a cross-sectional view of the present invention; Figure 7 This is a schematic diagram illustrating the error prevention mechanism during use of this utility model.

[0012] In the diagram: 1. Intermediate shaft fork; 11. Intermediate shaft mounting hole; 12. Eccentric countersunk hole; 13. Step surface one; 14. Bolt hole; 15. Fastening groove; 151. Stress relief through hole; 2. Steering shaft; 21. Thinned section; 22. Step surface two; 23. Bolt positioning groove; 3. Fastening bolt. Detailed Implementation

[0013] 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. Example

[0014] Please see Figure 1-7 This utility model provides a technical solution: a steering shaft and intermediate shaft fork anti-misalignment structure, including an intermediate shaft fork 1 and a steering shaft 2. The rear end face of the intermediate shaft fork 1 has an intermediate shaft mounting hole 11 along its axial direction, and the rear end face of the intermediate shaft fork 1 has an eccentric countersunk hole 12 located at the outer circumference of the corresponding intermediate shaft mounting hole 11. In this embodiment, the intermediate shaft mounting hole 11 is an elliptical hole, and the eccentric countersunk hole 12 is an elliptical hole. A stepped surface 13 is formed between the eccentric countersunk hole 12 and the outer circumference of the intermediate shaft mounting hole 11. The head of the steering shaft 2 is a thinned portion 21, and the longitudinal section of the thinned portion 21 is parallel to the intermediate shaft mounting hole 11. The structures are compatible, and the two ends of the thinned part 21 form a stepped surface 22 between the rear end of the steering shaft 2. The thinned part 21 of the steering shaft 2 is inserted into the intermediate shaft mounting hole 11, and one side of the stepped surface 22 of the steering shaft 2 abuts against the rear end face of the intermediate shaft fork 1. The outer wall of the intermediate shaft fork 1 is provided with a fastening groove 15 that communicates with the intermediate shaft mounting hole 11 along its axial direction. The outer wall of the circumference of the intermediate shaft fork 1 is provided with a bolt hole 14 that is perpendicular to the fastening groove 15. The bolt hole 14 is threaded with a fastening bolt 3, and the fastening bolt 3 passes through the fastening groove 15. The position of the stepped surface 13 corresponds to the fastening bolt 3. The top end of the thinned part 21 is provided with a bolt positioning groove 23, and the fastening bolt 3 passes through the bolt hole 14 and presses against the bolt positioning groove 23 of the steering shaft 2.

[0015] In use: the thinned part 21 of the steering shaft 2 is inserted into the intermediate shaft mounting hole 11, and the step surface 22 on one side of the steering shaft 2 abuts against the rear end face of the intermediate shaft fork 1. The fastening bolt 3 is connected in the bolt hole 14, and the fastening bolt 3 passes through the bolt hole 14 and presses against the bolt positioning groove 23 of the steering shaft 2. The steering shaft 2 is subjected to force on both sides in the axial force direction of the fastening bolt 3. The intermediate shaft fork 1 hugs the steering shaft 2, so that the steering shaft 2 and the intermediate shaft fork 1 cooperate with each other to achieve torque transmission. When the operator tightens the fastening bolt 3 after the thinned part 21 of the steering shaft 2 is only inserted into the eccentric countersunk hole 12, the steering shaft 2 is only subjected to force on one side at the eccentric countersunk hole 12 of the intermediate shaft joint fork 1. The intermediate shaft joint fork 1 cannot hold the steering shaft 2 tightly, and the intermediate shaft joint fork 1 and the steering shaft 2 cannot be connected. Therefore, the steering shaft 2 will detach from the intermediate shaft joint fork 1 to the outside, thereby avoiding the false connection caused by the inadequate fit between the intermediate shaft joint fork 1 and the steering shaft 2 in the axial direction, and playing a role in preventing incorrect installation. When the thinned part 21 of the steering shaft 2 passes through the eccentric countersunk hole 12, and the stepped surface 22 of the steering shaft 2 does not abut against the rear end face of the intermediate shaft joint fork 1, when the operator tightens the fastening bolt 3, the intermediate shaft joint fork 1 and the steering shaft 2 cannot be connected because the positions of the fastening bolt 3 and the bolt positioning groove 23 do not correspond. This avoids the false connection caused by the inadequate fit between the intermediate shaft joint fork 1 and the steering shaft 2 in the axial direction, and plays a role in preventing incorrect installation. Furthermore, the intermediate shaft joint fork 1 has a stress-relieving through hole 151 on the inner end of the fastening groove 15 on the outer wall of the intermediate shaft joint fork 1, and the stress-relieving through hole 151 is an elliptical hole or a waist-shaped hole structure; the stress-relieving through hole 151 can increase the clamping tightness between the intermediate shaft joint fork 1 and the steering shaft 2, and can prevent the bearing hole of the intermediate shaft joint fork 1 from deforming after the fastening bolt 3 is tightened, thereby avoiding affecting the swing torque of the intermediate shaft joint fork 1, improving the steering feel fluctuation and steering non-return problem.

[0016] The anti-misalignment structure for the steering shaft and intermediate shaft fork disclosed in this embodiment, through the eccentric countersunk hole 12 provided on the intermediate shaft fork 1 and the positioning fit between the fastening bolt 3 and the bolt positioning groove 23, avoids the false connection caused by the incomplete fit between the intermediate shaft fork 1 and the steering shaft 2 in the axial direction, and has a good anti-misalignment effect; the anti-misalignment structure for the steering shaft 2 and intermediate shaft fork 1 is easy to process and has a simple structure.

[0017] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A structure for preventing misalignment between a steering shaft and an intermediate shaft joint fork, comprising an intermediate shaft joint fork and a steering shaft, characterized in that: The rear end face of the intermediate shaft fork has an intermediate shaft mounting hole along its axial direction, and the rear end face of the intermediate shaft fork has an eccentric countersunk hole at the outer edge of the corresponding intermediate shaft mounting hole. A stepped surface is formed between the eccentric countersunk hole and the outer edge of the intermediate shaft mounting hole. The longitudinal section of the steering shaft head is adapted to the structure of the intermediate shaft mounting hole, and the steering shaft head is inserted into the intermediate shaft mounting hole. The outer wall of the intermediate shaft fork has a fastening groove communicating with the intermediate shaft mounting hole along its axial direction. The outer wall of the circumference of the intermediate shaft fork has a bolt hole perpendicular to the fastening groove. A fastening bolt is threaded into the bolt hole and passes through the fastening groove.

2. The anti-misalignment structure for steering shaft and intermediate shaft joint fork according to claim 1, characterized in that: The position of the step surface corresponds to that of the fastening bolt.

3. The anti-misalignment structure for steering shaft and intermediate shaft joint fork according to claim 1, characterized in that: The intermediate shaft mounting hole is an elliptical hole, and the eccentric countersunk hole is an elliptical hole.

4. The anti-misalignment structure for steering shaft and intermediate shaft joint fork according to claim 1, characterized in that: The head of the steering shaft is a thinned section. The longitudinal section of the thinned section is adapted to the structure of the intermediate shaft mounting hole. The two ends of the thinned section form a stepped surface two between the rear end of the steering shaft and the rear shaft body. The stepped surface two on one side of the steering shaft abuts against the rear end face of the intermediate shaft fork.

5. The anti-misalignment structure for steering shaft and intermediate shaft joint fork according to claim 4, characterized in that: The top of the thinned part is provided with a bolt positioning groove, and the fastening bolt passes through the bolt hole and presses against the bolt positioning groove of the steering shaft.

6. The anti-misalignment structure for steering shaft and intermediate shaft joint fork according to claim 1, characterized in that: The intermediate shaft joint fork has a stress-relieving through hole on the inner end of the fastening groove on its outer wall, and the stress-relieving through hole is an elliptical hole or a waist-shaped hole structure.

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