A transmission shaft pressure fixture with an elastic positioning structure

Abstract

This utility model relates to the field of transmission shaft press fitting technology, and discloses a transmission shaft press fitting with an elastic positioning structure, including a column, two limiting plates, a limiting pin, a cylindrical fork, and a transmission shaft. The transmission shaft is inserted into the column, and the top surface of the column is connected to the two limiting plates. The cylindrical fork is disposed between the two limiting plates and inserted into the top surface of the column. The cylindrical fork has an ear hole, and the limiting pin is inserted into the positioning hole and the ear hole of the limiting plate in sequence. This utility model effectively eliminates the phase angle error caused by the welding angle deviation of the anti-rotation plate in the traditional positioning method by precisely matching the spline positioning sleeve in the elastic positioning component with the external spline of the transmission shaft, greatly improving the phase angle accuracy of the transmission shaft and cylindrical fork assembly. The design of the buffer spring ensures that the spline positioning sleeve maintains close contact with the external spline of the transmission shaft during the press fitting process, while providing a certain buffering force, reducing the impact and vibration during the press fitting process, and enhancing the stability of the assembly.

Description

Technical Field

[0001] This utility model relates to the field of transmission shaft pressing fixtures, specifically a transmission shaft pressing fixture with an elastic positioning structure. Background Technology

[0002] As a core transmission component of the automotive steering system, the driveshaft plays a crucial role in vehicle operation. It is responsible for precisely transmitting steering torque, ensuring that the driver's steering actions are transmitted to the wheels without deviation, thus enabling agile steering. The assembly precision of the driveshaft directly affects the vehicle's steering sensitivity, driving stability, and driving safety. Insufficient assembly precision may lead to serious problems such as steering lag, vibration, or even loss of control during driving, greatly threatening the lives of passengers.

[0003] The press-fitting process for the driveshaft is a crucial step in the interference fit assembly of the driveshaft and the fork. In traditional press-fitting methods, the anti-rotation plate on the driveshaft is typically positioned and press-fitted using the limiting groove of the press head. However, the welding process between the anti-rotation plate and the driveshaft has certain limitations, inevitably leading to an angular deviation between them. This angular deviation makes the traditional positioning method inadequate in terms of phase angle accuracy, failing to meet the high precision requirements of modern automotive steering systems. Furthermore, due to the welding angular deviation, the relative position between the driveshaft and the fork is prone to slight changes during press-fitting, resulting in poor assembly stability. Over long-term automotive use, this unstable assembly state may gradually worsen, affecting the normal operation of the driveshaft, shortening its lifespan, and increasing maintenance costs and operational risks.

[0004] To address the aforementioned issues, we propose a transmission shaft pressure fixture with an elastic positioning structure. Utility Model Content

[0005] The purpose of this invention is to provide a transmission shaft pressing device with an elastic positioning structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a transmission shaft pressing fixture with an elastic positioning structure, comprising a column, two limiting plates, a limiting pin, a cylindrical fork, and a transmission shaft; the transmission shaft is inserted into the column; the top surface of the column is connected to the two limiting plates; the cylindrical fork is disposed between the two limiting plates; the cylindrical fork is inserted into the top surface of the column; the cylindrical fork is provided with an ear hole; the limiting pin is sequentially inserted into the positioning hole of the limiting plate and the ear hole.

[0007] Preferably, it further includes a guide post and a fixing plate; the guide post has an inner cavity; the guide post is connected to the bottom surface of the column through the fixing plate.

[0008] Preferably, it further includes an elastic positioning component; the elastic positioning component includes a spline positioning sleeve, a guide pin, and a buffer spring; the guide pin is fixedly connected to the outer wall of the spline positioning sleeve; an elongated hole is opened on the side wall of the guide post; the guide pin is slidably connected to the elongated hole of the guide post; the top surface of the buffer spring is connected to the bottom surface of the spline positioning sleeve; the bottom surface of the buffer spring abuts against the bottom surface of the inner cavity of the guide post; one end of the drive shaft inserted into the column is provided with an external spline; the spline positioning sleeve and the external spline are clearance fitted.

[0009] Preferably, the top end of the drive shaft is provided with an anti-rotation plate.

[0010] Preferably, the spline shape of the inner hole of the spline positioning sleeve is adapted to the shape of the outer spline.

[0011] Preferably, the fixing plate, the bottom surface of the column, and the top surface of the guide column are connected by bolts.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] Improved phase angle accuracy: The precise engagement between the spline positioning sleeve in the elastic positioning component and the external spline of the drive shaft effectively eliminates the phase angle error caused by the welding angle deviation of the anti-rotation plate in the traditional positioning method, greatly improving the phase angle accuracy of the drive shaft and the fork assembly.

[0014] Enhanced assembly stability: The design of the buffer spring ensures that the spline positioning sleeve maintains close contact with the external spline of the drive shaft during the press-fitting process, while providing a certain buffering force to reduce impact and vibration during the press-fitting process and enhance assembly stability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the main cross-section of the structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the drive shaft, fork, external spline, and anti-rotation plate in this utility model;

[0018] Figure 4 This is a schematic diagram showing the connection relationship between the guide pin and the spline positioning sleeve in this utility model.

[0019] In the diagram: 1-Column, 2-Limiting plate, 3-Limiting pin, 4-Guide column, 5-Fixing plate, 6-Spline positioning sleeve, 7-Guide pin, 8-Buffer spring, 9-Cylinder fork, 10-Ear hole, 11-Drive shaft, 12-External spline, 13-Anti-rotation plate. Detailed Implementation

[0020] 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.

[0021] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 This utility model provides a technical solution: a transmission shaft pressing fixture with an elastic positioning structure, including a column 1, two limiting plates 2, limiting pins 3, a fork 9, and a transmission shaft 11. The transmission shaft 11 is inserted into the column 1. The column 1 is made of high-strength steel, preferably Q345B steel, which has good mechanical properties and stability and can withstand the large pressure generated during the pressing process of the transmission shaft. The column 1 is cylindrical in shape, and the inside of the column 1 has a hole that matches the outer diameter of the transmission shaft 11 to ensure that the transmission shaft 11 can be smoothly inserted and maintain a relatively stable position.

[0022] Two limiting plates 2 are connected to the top surface of the column 1, and the two limiting plates 2 are arranged in parallel to restrict the horizontal movement of the cylindrical fork 9. The limiting plates 2 are provided with positioning holes, and the size of the positioning holes of the limiting plates 2 is designed according to the diameter of the limiting pin 3 to ensure that the limiting pin 3 can be smoothly inserted.

[0023] The fork 9 is provided with an ear hole 10, which is press-fitted to the drive shaft 11. The fork 9 is usually made of cast iron or alloy steel, which has high strength and wear resistance.

[0024] The limiting pin 3 is inserted sequentially into the positioning hole of the limiting plate 2 and the ear hole 10 of the fork 9. The limiting pin 3 serves to fix the position of the fork 9, prevent the fork 9 from shifting during the pressing process, and ensure assembly accuracy.

[0025] The transmission shaft pressing fixture of the elastic positioning structure of this utility model also includes a guide post 4 and a fixing plate 5. The guide post 4 has an inner cavity and is connected to the bottom surface of the column 1 through the fixing plate 5. The guide post 4 is also made of high-strength steel, and its inner cavity is used to install the elastic positioning component. The fixing plate 5 plays a connecting and fixing role. The guide post 4 and the column 1 are firmly connected by bolts to ensure the structural stability of the entire device.

[0026] The elastic positioning component includes a spline positioning sleeve 6, a guide pin 7, and a buffer spring 8.

[0027] The spline shape of the inner hole of the spline positioning sleeve 6 is adapted to the shape of the outer spline 12 at the end of the drive shaft 11 that is inserted into the column 1, and it is a clearance fit. This design allows the spline positioning sleeve 6 to be accurately fitted onto the outer spline 12 of the drive shaft 11, achieving precise positioning of the drive shaft 11. The guide pin 7 is fixedly connected to the outer wall of the spline positioning sleeve 6, and the guide pin 7 guides the spline positioning sleeve 6 to slide up and down within the guide post 4.

[0028] The guide pin 7 is slidably connected in the elongated hole opened in the side wall of the guide post 4 to ensure that the spline positioning sleeve 6 will not shift during the up and down movement, thus ensuring the accuracy of positioning.

[0029] The top surface of the buffer spring 8 is connected to the bottom surface of the spline positioning sleeve 6, and the bottom surface of the buffer spring 8 abuts against the bottom surface of the inner cavity of the guide post 4. The buffer spring 8 is a compression spring, specifically a YB-10×50×1.5 spring with a moderate elastic coefficient, which can provide a certain buffering force during the press-fitting process of the drive shaft 11, reducing the impact damage to the drive shaft and other devices in this utility model. At the same time, it ensures that the spline positioning sleeve 6 is always in close contact with the external spline 12 of the drive shaft 11, improving the stability of positioning.

[0030] The anti-rotation plate 13 is disposed at the top end of the transmission shaft 11 to prevent the transmission shaft 11 from rotating during the pressing process, thereby further ensuring assembly accuracy.

[0031] Working principle:

[0032] First, the guide post 4 is bolted to the bottom surface of the column 1 via the fixing plate 5 to ensure a secure connection. Then, the elastic positioning assembly is installed inside the guide post 4, the spline positioning sleeve 6 slides within the inner cavity of the guide post 4, the guide pin 7 is slidably connected to the elongated hole in the side wall of the guide post 4, and the buffer spring 8 is placed on the bottom surface of the inner cavity of the guide post 4, with the top surface of the buffer spring 8 connected to the bottom surface of the spline positioning sleeve 6.

[0033] Next, the drive shaft 11 is inserted into the column 1, so that the external spline 12 at one end of the drive shaft 11 engages with the inner spline of the spline positioning sleeve 6. Because the two are in a clearance fit, the drive shaft 11 can be smoothly inserted and the spline positioning sleeve 6 can accurately position the drive shaft 11. At this time, the anti-rotation plate 13 at the top of the drive shaft 11 prevents the drive shaft 11 from rotating.

[0034] Then, the fork 9 is placed between the two limiting plates 2, and the position of the fork 9 is adjusted so that the limiting pin 3 can be inserted into the positioning hole of the limiting plate 2 and the ear hole 10 of the fork 9 in sequence, thereby fixing the position of the fork 9.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A transmission shaft pressing fixture with an elastic positioning structure, characterized in that, The device includes a column (1), two limiting plates (2), a limiting pin (3), a fork (9), and a drive shaft (11); the drive shaft (11) is inserted into the column (1); the top surface of the column (1) is connected to the two limiting plates (2); the fork (9) is disposed between the two limiting plates (2); the fork (9) is inserted into the top surface of the column (1); the fork (9) is provided with an ear hole (10); the limiting pin (3) is inserted into the positioning hole of the limiting plate (2) and the ear hole (10) in sequence.

2. The transmission shaft pressing fixture with an elastic positioning structure according to claim 1, characterized in that, It also includes a guide post (4) and a fixing plate (5); the guide post (4) has an inner cavity; the guide post (4) is connected to the bottom surface of the column (1) through the fixing plate (5).

3. The transmission shaft pressing fixture with an elastic positioning structure according to claim 2, characterized in that, It also includes an elastic positioning component; the elastic positioning component includes a spline positioning sleeve (6), a guide pin (7) and a buffer spring (8); the outer wall of the spline positioning sleeve (6) is fixedly connected to the guide pin (7); the side wall of the guide post (4) is provided with an elongated hole; the guide pin (7) is slidably connected to the elongated hole of the guide post (4); the top surface of the buffer spring (8) is connected to the bottom surface of the spline positioning sleeve (6); the bottom surface of the buffer spring (8) abuts against the bottom surface of the inner cavity of the guide post (4); one end of the drive shaft (11) inserted into the column (1) is provided with an external spline (12); the spline positioning sleeve (6) and the external spline (12) are clearance-fitted.

4. The transmission shaft pressing fixture with an elastic positioning structure according to claim 1, characterized in that, The top end of the drive shaft (11) is provided with an anti-rotation plate (13).

5. The transmission shaft pressing fixture with an elastic positioning structure according to claim 3, characterized in that, The spline shape of the inner hole of the spline positioning sleeve (6) is adapted to the shape of the outer spline (12).

6. The transmission shaft pressing fixture with an elastic positioning structure according to claim 2, characterized in that, The fixing plate (5), the bottom surface of the column (1) and the top surface of the guide column (4) are connected by bolts.

Images