An improved press-fitting fixture for drive shaft assembly

Abstract

This utility model relates to the field of drive shaft assembly technology, and in particular to an improved press-fitting fixture for drive shaft assembly. It includes a base, a spring-loaded assembly, and an upper pad block positioned above the base via the spring-loaded assembly. The press-fitting fixture also includes a lower pad block, a guide sleeve, and a bushing. A through-hole is formed in the center of the base. The lower pad block, guide sleeve, and bushing are coaxially arranged inside the press-fitting hole from bottom to top. The two ends of the guide sleeve along its length abut against the lower pad block and the bushing, respectively. The bushing has a tubular structure, and the upper part of the guide sleeve is also tubular, extending into the bushing. The lower pad block is threadedly connected to the base. This utility model can improve the efficiency and reliability of drive shaft assembly.

Description

Technical Field

[0001] This utility model relates to the field of transmission shaft assembly technology, specifically to an improved press-fitting fixture for transmission shaft assembly. Background Technology

[0002] In vehicles, machine tools, and various electromechanical products, the drive shaft is the core component for transmitting torque and rotational motion. Its assembly process typically requires pressing bearings, gears, or couplings onto the drive shaft using an interference fit. Therefore, this places high demands on the positioning accuracy, uniform force distribution, and assembly efficiency of the press-fitting fixtures.

[0003] Existing technology, such as the applicant's patent publication number CN219685421U, discloses an assembly pressing tooling. This tooling includes a base, a toothed pad, a spring-loaded assembly, and a clamping assembly composed of a positioning post and a pressing pad. This tooling achieves balanced force on the transmission rod during pressing and prevents deformation. However, this tooling also has significant defects in practical applications: poor adaptability, the inner diameter of the positioning post is fixed, and changing product specifications requires replacing the entire tooling or core components, which is time-consuming and results in low production efficiency; the transmission seat is not reliably fixed, as it is placed only by the groove, and it is prone to displacement or rotation during pressing, leading to assembly eccentricity and an increased product defect rate. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an improved press-fitting fixture for drive shaft assembly, which can improve the efficiency and reliability of drive shaft assembly.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an improved press-fitting fixture for assembling drive shafts, comprising a base, a spring-loaded assembly, and an upper pad block disposed above the base via the spring-loaded assembly; the press-fitting fixture further comprises a lower pad block, a guide sleeve, and a bushing; a through-type press-fitting hole is opened in the middle of the base; the lower pad block, guide sleeve, and bushing are coaxially disposed inside the press-fitting hole from bottom to top; wherein, the two ends of the guide sleeve in the length direction respectively abut against the lower pad block and the bushing; the bushing is a tubular structure; the upper part of the guide sleeve is a tubular structure and extends into the bushing; the lower pad block is threadedly connected to the base.

[0006] Preferably, a limiting ring is provided on the inner top of the bushing; the upper end of the guide sleeve abuts against the limiting ring.

[0007] Preferably, the pressing fixture further includes a clamping assembly; the top of the upper pad has a pressing groove and a clamping groove communicating therewith; the clamping assembly includes a slider and a clamping spring, the slider is slidably disposed in the clamping groove, and the clamping spring is disposed between the tail end of the slider and the inner wall of the clamping groove; the bottom of the pressing groove has a through hole communicating with the space of the guide sleeve.

[0008] Preferably, the guide sleeve includes a tubular guide sleeve body and a polygonal positioning block fixed to the lower end of the guide sleeve body; the upper end of the lower pad block is provided with a positioning hole that matches the polygonal positioning block.

[0009] Preferably, each side wall of the pressing groove is provided with a slide rail; each end of the slider in the width direction is provided with a slide groove that slides in cooperation with the corresponding side slide rail.

[0010] Preferably, a rubber pad is provided at one end of the slider near the pressing groove.

[0011] Preferably, both the press-fit hole and the bushing are T-shaped structures.

[0012] Preferably, a knob is provided at the lower end of the lower pad body.

[0013] Preferably, the upper part of the base has a plurality of mounting holes; a plurality of spring-loaded components are provided and are arranged corresponding to the mounting holes; the spring-loaded components include a guide shaft, a positioning bolt, a limiting bolt and a return spring; the upper end of the guide shaft is fixed to a pad by a positioning bolt, and the lower end is slidably inserted into the mounting hole; the return spring is disposed in the mounting hole and pressed against the lower end of the guide shaft; a longitudinal limiting groove is provided on the outer periphery of the guide shaft, and the limiting bolt is screwed laterally into the base and extends into the limiting groove.

[0014] Preferably, the upper end of the slider is provided with a plurality of anti-slip grooves.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: the guide sleeve can be quickly replaced by rotating the lower pad, shortening the changeover time, adapting to transmission rods of different diameters, and solving the long-standing bottleneck of multi-specification compatibility in the industry; the guide sleeve adopts a two-end fixed structure of "the upper end is held by the bushing limiting ring and the lower end is inserted into the positioning hole by the positioning block", eliminating the radial swing caused by the traditional single-sided cantilever; with the loose fit design of the T-shaped bushing and the pressing hole, the transmission rod remains coaxial throughout the pressing process, effectively avoiding bending deformation of the transmission rod and improving the pressing accuracy and service life of the improved pressing tool. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the longitudinal section of the press-fitting fixture of this utility model;

[0017] Figure 2 This is a schematic diagram of the upper structure of the press-fitting fixture of this utility model;

[0018] Figure 3 This is a schematic diagram of the lower pad block structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the guide sleeve structure of this utility model.

[0020] In the diagram: 1. Base, 2. Upper pad, 3. Springback assembly, 4. Lower pad, 5. Guide sleeve, 6. Bushing, 7. Slider, 8. Compression spring, 11. Press-fit hole, 12. Mounting hole, 21. Press-fit groove, 22. Compression groove, 23. Slide rail, 31. Guide shaft, 32. Positioning bolt, 33. Limit bolt, 34. Return spring, 311. Limit groove, 41. Positioning hole, 42. Knob, 51. Guide sleeve body, 52. Positioning block, 61. Limit ring, a1. Transmission rod, a2. Transmission seat. Detailed Implementation

[0021] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings, so that those skilled in the art can more clearly understand how to practice this utility model. Although this utility model has been described in conjunction with its preferred embodiments, these embodiments are merely illustrative and not intended to limit the scope of this utility model.

[0022] See Figure 1-4 In one embodiment of this utility model, an improved press-fitting fixture for assembling a drive shaft is provided. This improved press-fitting fixture aims to solve the problem of poor adaptability of existing press-fitting fixtures. It includes: a base 1, an upper pad 2, two sets of spring-loaded components 3, a lower pad 4, a positioning component, and a clamping component.

[0023] The base 1 has a through T-shaped press-fit hole 11 in the middle, and the lower part of the inner wall of the press-fit hole 11 has an internal thread; the upper part of the base 1 has two symmetrical mounting holes 12; the mounting holes 12 are correspondingly set with the spring-loaded assembly 3.

[0024] The lower pad 4 is installed in the press-fit hole 11. The lower pad 4 has an external thread that matches the internal thread on its outer periphery. The lower pad 4 has a positioning hole 41 with an internal hexagonal structure on its upper shaft. The lower end of the lower pad 4 has a knob 42 for easy manual rotation to adjust the height of the lower pad 4 in the base 1.

[0025] The springback assembly 3 includes a guide shaft 31, a positioning bolt 32, a limiting bolt 33, and a return spring 34. The upper end of the guide shaft 31 is fixed to the upper pad 2 via the positioning bolt 32. The return spring 34 is located in the mounting hole 12, and the lower part of the guide shaft 31 extends slidably within the mounting hole 12 and presses against the return spring 34. A strip-shaped limiting groove 311 is formed on the outer periphery of the guide shaft 31. The limiting bolt 33 is horizontally mounted on the base 1 via a threaded connection, and the screw portion of the limiting bolt 33 is screwed into the limiting groove 311, thus slidably connecting the limiting bolt 33 to the guide shaft 31. Under the action of external force (pressing down), the guide shaft 31 drives the upper pad 2 to move downward, compressing the return spring 34. After the external force is removed, under the action of the return spring 34, the guide shaft 31 drives the upper pad 2 to move upward and reset. The limiting groove 311 and the limiting bolt 33 together limit the vertical travel of the guide shaft 31.

[0026] The positioning assembly is used to fix the transmission rod a1, so that the transmission rod a1 is subjected to balanced force and is not easily deformed within the positioning assembly. The positioning assembly includes a guide sleeve 5 and a bushing 6. The bushing 6 is a T-shaped tubular structure with a limiting ring 61 coaxial with the body at its top. The bushing 6 is located in the T-shaped pressing hole 11. The T-shaped pressing hole 11 facilitates the installation of the bushing 6. After installation, the misaligned step on the inner wall of the pressing hole 11 can abut against the step at the top of the bushing 6, so that the bushing 6 remains stable during pressing. The bushing 6 is easily assembled into the press-fit hole 11; the outer periphery of the bushing 6 is loosely fitted with the inner wall of the press-fit hole 11; the guide sleeve 5 includes a tubular guide sleeve body 51 and a positioning block 52 fixed at the lower end of the guide sleeve body 51, the positioning block 52 having a hexagonal structure; after assembly, the lower end of the guide sleeve body 51 abuts against the upper end of the lower pad 4, the upper part of the guide sleeve body 51 extends into the bushing 6 and abuts against the limiting ring 61, and the positioning block 52 slides into the internal hexagonal positioning hole 41 at the upper end of the lower pad 4. This arrangement achieves the fixation of the guide sleeve 5 at both ends (the upper end is limited by the bushing limiting ring, and the lower end is prevented from rotating by the positioning block and the positioning hole); the guide sleeve body 51 is loosely fitted with the bushing 6; the guide sleeve 5, as a replaceable component, is designed with different inner diameter specifications to accommodate transmission rods a1 with different outer diameters. When changing, simply rotate the knob 42 of the lower pad 4 to adjust its height or replace the guide sleeve 5 to quickly complete the adaptation conversion, which improves the adaptability of this tooling and also increases production efficiency.

[0027] To ensure the reliability of the press-fitting, the clamping assembly is located at the top of the upper pad 2; specifically, the upper pad 2 is suspended above the base 1 by two sets of spring-loaded assemblies 3; the top of the upper pad 2 is provided with a press-fitting groove 21 for accommodating the transmission seat a2; the bottom of the press-fitting groove 21 is provided with a through hole coaxial with and communicating with the guide sleeve 5, for the transmission rod a1 to pass through; the top of the upper pad 2 is also provided with a pressing groove 22 communicating with the press-fitting groove 21;

[0028] Each of the two side walls of the clamping groove 22 is provided with a slide rail 23; the length direction of the slide rail 23 is the same as the opening direction of the clamping groove 22; the clamping assembly is provided in the clamping groove 22, and the clamping assembly includes a slider 7 and a clamping spring 8. The slider 7 is slidably disposed in the clamping groove 22, and its upper end is not higher than the top of the upper pad block 2; each end of the slider 7 in the width direction is also provided with a slide groove that can slide and cooperate with the slide rail 23 at the corresponding position to ensure that the slider 7 moves smoothly and the structure is stable; the clamping spring 8 is disposed between the tail end of the slider 7 and the inner wall of the clamping groove 22, providing the slider 7 with a clamping force in the direction of the pressing groove 21;

[0029] During press fitting, the press fitting groove 21 is used to install the transmission seat a2. Under the action of the compression spring 8, the first end of the slider 7 presses against the outside of the transmission seat a2 to achieve lateral fixation and prevent it from shifting or rotating during the press fitting process.

[0030] In one embodiment, a rubber pad may be provided at the head end of the slider 7 (the end near the pressing groove 21) to increase the contact area and friction with the transmission seat a2, thereby achieving more stable and reliable pressing.

[0031] To facilitate the sliding of the slider 7 embedded in the clamping groove 22, several anti-slip grooves are provided on the upper end of the slider 7, which facilitates manual operation of the slider 7.

[0032] This technical solution, through replaceable guide sleeves, positioning of both ends of the guide sleeves via lower pads and bushings, and the installation of lateral clamping components on the upper pads, enables precise pressing of drive shafts of different specifications in a short time using only one set of tooling. It eliminates the three major pain points of traditional structures: slow changeover, poor positioning, and easy deformation. It also shortens changeover time, reduces overall costs, and truly achieves the goal of "one mold for multiple uses, high efficiency and reliability, and low-cost maintenance".

[0033] The guide sleeve can be quickly replaced by rotating the lower pad, shortening the changeover time and adapting to transmission rods of different diameters, thus solving the long-standing bottleneck of multi-specification compatibility in the industry. The guide sleeve adopts a two-end fixed structure with "the upper end supported by the bushing limit ring and the lower end inserted into the positioning hole by the positioning block", eliminating the radial sway caused by the traditional single-sided cantilever. With the loose fit design of the T-shaped bushing and the pressing hole, the transmission rod remains coaxial throughout the pressing process, effectively avoiding bending deformation and improving the pressing accuracy and service life of bearings or gears.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An improved press-fitting fixture for assembling drive shafts, comprising a base (1), a spring-loaded assembly (3), and an upper pad (2) disposed above the base (1) via the spring-loaded assembly (3), characterized in that: The press-fitting fixture also includes a lower pad (4), a guide sleeve (5), and a bushing (6); a through-type press-fitting hole (11) is opened in the middle of the base (1), and the lower pad (4), guide sleeve (5), and bushing (6) are arranged coaxially from bottom to top inside the press-fitting hole (11), wherein the two ends of the guide sleeve (5) in the length direction abut against the lower pad (4) and the bushing (6) respectively, the bushing (6) is a tubular structure, the upper part of the guide sleeve (5) is a tubular structure and the upper part of the guide sleeve (5) extends into the bushing (6); the lower pad (4) and the base (1) are threadedly connected.

2. The improved press-fitting fixture for assembling drive shafts according to claim 1, characterized in that: The inner top of the bushing (6) is provided with a limiting ring (61); the upper end of the guide sleeve (5) abuts against the limiting ring (61).

3. An improved press-fitting fixture for assembling drive shafts according to claim 1, characterized in that: The press-fitting fixture also includes a clamping assembly; the top of the upper pad (2) is provided with a press-fitting groove (21) and a clamping groove (22) connected thereto; the clamping assembly includes a slider (7) and a clamping spring (8), the slider (7) is slidably disposed in the clamping groove (22), and the clamping spring (8) is disposed between the tail end of the slider (7) and the inner wall of the clamping groove (22); the bottom of the press-fitting groove (21) is provided with a through hole that is spatially connected to the guide sleeve (5).

4. An improved press-fitting fixture for assembling drive shafts according to claim 1, characterized in that: The guide sleeve (5) includes a tubular guide sleeve body (51) and a polygonal positioning block (52) fixed at the lower end of the guide sleeve body (51); the lower pad (4) has a positioning hole (41) at the upper axis that is adapted to the polygonal positioning block (52).

5. An improved press-fitting fixture for assembling drive shafts according to claim 3, characterized in that: Each side wall of the pressing groove (22) is provided with a slide rail (23); each end of the slider (7) in the width direction is provided with a slide groove that slides in cooperation with the corresponding side slide rail (23).

6. An improved press-fitting fixture for assembling drive shafts according to claim 3, characterized in that: The slider (7) has a rubber pad at one end near the pressing groove (21).

7. An improved press-fitting fixture for assembling drive shafts according to claim 1, characterized in that: Both the press-fit hole (11) and the bushing (6) are T-shaped structures.

8. An improved press-fitting fixture for assembling drive shafts according to claim 1, characterized in that: The lower end of the body of the lower pad (4) is provided with a knob.

9. An improved press-fitting fixture for assembling drive shafts according to claim 1, characterized in that: The base (1) has several mounting holes (12) on its upper part; the spring-loaded assembly (3) has several holes and is arranged corresponding to the mounting holes (12); the spring-loaded assembly (3) includes a guide shaft (31), a positioning bolt (32), a limiting bolt (33) and a return spring (34); the upper end of the guide shaft (31) is fixed to the upper pad (2) by the positioning bolt (32), and the lower end is slidably inserted into the mounting hole (12); the return spring (34) is located in the mounting hole (12) and is pressed against the lower end of the guide shaft (31); the guide shaft (31) has a longitudinal limiting groove (311) on its outer periphery, and the limiting bolt (33) is screwed into the base (1) laterally and extends into the limiting groove (311).

10. An improved press-fitting fixture for assembling drive shafts according to claim 3, characterized in that: The upper end of the slider (7) is provided with several anti-slip grooves.

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