Riveting tool for assembling cross shaft universal joint

Abstract

The utility model belongs to the technical field of small-size universal joints, and discloses a riveting cutter for assembling a cross shaft universal joint, which comprises a cutter bar, a press-fitting disc is fixed at one end of the cutter bar, a plurality of extrusion cutters are arranged on the outer side of the press-fitting disc in a surrounding manner, and each extrusion cutter is fixed at the end of the cutter bar; the purpose of fixing the shaft sleeve is achieved by conducting extrusion deformation on the shaft hole in the universal joint fork, the bottleneck that a clamping spring is not easy to install in the shaft hole in the small-size universal joint fork is solved, and the effects of reducing cost and improving efficiency are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of small-size universal joints, in particular to a riveting tool for assembling a cross-axis universal joint. Background Art

[0002] A universal joint is a component that achieves variable-angle power transmission and is widely used in locations where the direction of the transmission axis needs to be changed. The most common and classic type of universal joint is the cross-axis universal joint.

[0003] The cross-axis universal joint mainly includes a cross shaft, two universal joint forks and four needle bearings. When one universal joint fork rotates, the cross shaft drives the other universal joint fork to rotate. At the same time, due to the design of the cross shaft, the two universal joint forks can swing relative to each other in any direction to adapt to the change of the angle between the two shafts. The function of the needle bearing is to reduce friction during the rotation process and improve the transmission efficiency.

[0004] In the Chinese invention patent with patent application number 202311349960.4, an assembly device and assembly method for assembling a universal joint and a yoke are proposed. In this patent, a retaining spring is used to fix the sleeve pressed into the shaft hole on the yoke to prevent the sleeve from falling off. However, for the smaller yoke shaft hole, the processing of the retaining spring groove is relatively difficult, and if the cross shaft is assembled without the retaining spring groove, it is very easy to cause the sleeve to fall off. Utility Model Content

[0005] The main technical problem to be solved by the utility model is to provide a riveting tool for assembling a cross-axis universal joint, which achieves the purpose of fixing the shaft sleeve by extruding and deforming the shaft hole on the universal joint fork, thereby solving the bottleneck that it is difficult to install a retaining spring in the shaft hole on the small-sized universal joint fork, and achieves the effect of reducing costs and increasing efficiency.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A riveting tool for assembling a cross-axis universal joint comprises a tool rod, one end of which is fixed with a press-fitting disc, the outer side of which is surrounded by a plurality of extrusion knives, each of which is fixed to the end of the tool rod.

[0008] The following is a further optimization of the above technical solution by the utility model:

[0009] Each of the extrusion knives and the press-fitting disc is integrally formed with the knife rod.

[0010] Further optimization: the knife rod includes an integrally formed round rod and a fixed ring seat, each extrusion knife and press-fit disc are fixed to the end of the round rod, and the fixed ring seat is arranged at one end of the round rod close to the extrusion knife.

[0011] Further optimization: each of the extrusion knives includes an integrally formed square seat and extrusion teeth, each square seat is fixed to the end of the knife rod, each extrusion tooth is a straight quadrangular prism with a right-angled trapezoidal cross-section, and the extrusion slope on each extrusion tooth is arranged on the side away from the press-fitting disc.

[0012] Further optimization: the diameter of the press-fitted disc is smaller than the diameter of the round rod.

[0013] Further optimization: one side wall of each of the square seats is tightly attached to the peripheral wall of the press-fitted disc, and the other side wall of each of the square seats is flush with the peripheral wall of the round rod.

[0014] The utility model adopts the above technical scheme and has the following beneficial effects: the technical scheme of the utility model is ingeniously conceived and reasonably structured. By combining the riveting tool with the press and using the extrusion tool with a toothed structure, the edge position of the shaft hole on the universal joint fork is extruded and deformed to achieve the fixation of the sleeve.

[0015] The shaft sleeve is fixed by using the deformation of the shaft hole instead of the retaining spring, so it is not limited by the size of the universal joint, thus solving the bottleneck of the difficulty in installing the retaining spring in the shaft hole on the small-sized universal joint fork, improving the assembly efficiency of the small-sized universal joint, and thus achieving the effect of reducing costs and increasing efficiency.

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the utility model;

[0019] Figure 2 It is the installation diagram of the universal joint fork and the cross shaft.

[0020] Among them: 1- knife bar; 11- round rod; 12- fixed ring seat; 2- press-fit disc; 3- extrusion knife; 31- square seat; 32- extrusion tooth; 4- shaft sleeve; 5- universal joint fork; 51- shaft hole; 6- cross shaft. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1 and Figure 2 As shown together, a riveting tool for assembling a cross-axis universal joint includes a tool rod 1, one end of which is fixed with a press-fitting disc 2, and the outer side of the press-fitting disc 2 is surrounded by a plurality of extrusion knives 3, each of which is fixed to the end of the tool rod 1.

[0023] In this embodiment, the knife bar 1 is used to be combined and fixed with a press machine (not shown in the figure).

[0024] In this embodiment, all the extrusion knives 3 form a tooth-shaped structure at the bottom of the riveting tool.

[0025] Compared with the traditional universal joint assembly method in which the cross shaft 6 pressing tool presses the sleeve 4 into the shaft hole 51 on the universal joint fork 5 through a press machine and relies on a retaining spring to fix the sleeve 4, the utility model adopts a structure in which the shaft hole 51 is squeezed and deformed to fix the sleeve 4.

[0026] In this embodiment, there is no need to machine a retaining spring groove inside the shaft hole 51, nor is there a need to assemble the retaining spring, which makes the internal structure of the universal fork simple and simplifies the assembly process of the universal fork. Moreover, the installation of the sleeve 4 is no longer limited by the size of the universal joint, thereby solving the problem that the retaining spring groove in the shaft hole 51 on a small-sized universal joint is difficult to machine and the retaining spring is difficult to install, thereby improving the assembly efficiency of small-sized universal joints and reducing the production cost of universal joints.

[0027] Each extrusion knife 3 and the pressing disc 2 are integrally formed with the knife rod 1 .

[0028] In this embodiment, the riveting tool is manufactured as a whole, which is simple to process and has a low failure rate.

[0029] In this embodiment, the riveting tool is made of 40 chromium or die steel as a whole, and the riveting tool is heat treated as a whole to make its hardness reach 48-55HRC, thereby extending the service life of the riveting tool and reducing the cost investment.

[0030] like Figure 1 As shown, the knife rod 1 includes an integrally formed round rod 11 and a fixed ring seat 12 , each extrusion knife 3 and the press-fitting disc 2 are fixed to the end of the round rod 11 , and the fixed ring seat 12 is arranged at one end of the round rod 11 close to the extrusion knife 3 .

[0031] In this embodiment, the fixing ring seat 12 forms a step structure on the round rod 11, so as to facilitate the fixing of the knife bar 1 on the press.

[0032] like Figure 1 As shown, each extrusion knife 3 includes an integrally formed square seat 31 and an extrusion tooth 32. Each square seat 31 is fixed to the end of the knife rod 1. Each extrusion tooth 32 is a straight quadrangular prism with a right-angled trapezoidal cross-section. The extrusion slope 33 on each extrusion tooth 32 is arranged on the side away from the press-fitting disc 2.

[0033] In this embodiment, the setting of the extrusion teeth 32 realizes the extrusion deformation of the edge position of the shaft hole 51, so that the edge position of the shaft hole 51 becomes uneven, and the diameter at the deformed position is smaller than the diameter of the sleeve 4, thereby achieving the purpose of tightening the sleeve 4 to prevent it from falling off.

[0034] Furthermore, the diameter of the press-fitting disc 2 is smaller than the diameter of the round rod 11 .

[0035] In this embodiment, the press-fitting disc 2 is used to press-fit the shaft sleeve 4 .

[0036] In addition, one side wall of each square seat 31 is closely attached to the peripheral wall of the press-fitting disc 2 , and the other side wall of each square seat 31 is flush with the peripheral wall of the round rod 11 .

[0037] In the actual assembly process of the universal joint: first, the tool rod 1 is fixed on the press, and the tool rod 1 is coaxially arranged with the shaft hole 51 to be press-fitted.

[0038] Secondly, the press drives the riveting tool to move downward, and the press disc 2 presses the sleeve 4 downward. During the downward movement of the sleeve 4, it will gradually be sleeved on the shaft end of the cross shaft 6 and inserted into the shaft hole 51.

[0039] Afterwards, after the sleeve 4 is fully inserted into the shaft hole 51 , the extrusion teeth 32 are first inserted into the shaft hole 51 . In the process of gradually going deeper, the extrusion bevel 33 will continuously squeeze the side wall at the edge of the shaft hole 51 , and the extruded side wall will be deformed, thereby achieving the effect of tightening the sleeve 4 .

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A riveting tool for assembling a cross-axis universal joint, characterized in that: It comprises a knife rod (1), one end of which is fixed with a pressing disc (2), the outer side of which is surrounded by a plurality of extrusion knives (3), and each extrusion knife (3) is fixed to the end of the knife rod (1).

2. A riveting tool for assembling a cross-axis universal joint according to claim 1, characterized in that: Each of the extrusion knives (3) and the pressing disc (2) is integrally formed with the knife rod (1).

3. The riveting tool for assembling a cross-axis universal joint according to claim 2, characterized in that: The knife rod (1) comprises an integrally formed round rod (11) and a fixed ring seat (12); each extrusion knife (3) and the press-fitting disc (2) are fixed to the end of the round rod (11); and the fixed ring seat (12) is arranged at one end of the round rod (11) close to the extrusion knife (3).

4. The riveting tool for assembling a cross-axis universal joint according to claim 3, characterized in that: Each of the extrusion knives (3) comprises an integrally formed square seat (31) and an extrusion tooth (32); each square seat (31) is fixed to the end of the knife rod (1); each extrusion tooth (32) is a straight quadrangular prism with a right-angled trapezoidal cross section; and an extrusion slope (33) on each extrusion tooth (32) is arranged on a side away from the press-fitting disc (2).

5. The riveting tool for assembling a cross-axis universal joint according to claim 4, characterized in that: The diameter of the press-fitting disc (2) is smaller than the diameter of the round rod (11).

6. The riveting tool for assembling a cross-axis universal joint according to claim 5, characterized in that: One side wall of each square seat (31) is tightly attached to the peripheral wall of the press-fitting disc (2), and the other side wall of each square seat (31) is flush with the peripheral wall of the round rod (11).

Images