Transmission nut punching and riveting tool

Abstract

The utility model relates to a nut punching and riveting device, in particular to a transmission nut punching and riveting tool. The punching and riveting device aims to solve the problem that when a nut on a transmission shaft of a transmission is punched and riveted in the prior art, the punching and riveting drop point position and punching and riveting strength are difficult to control. The punching and riveting tool comprises a tool body, a tool inner hole formed in the center of the tool body, a plurality of tool bases arranged on the lower end face of the tool body, punching and riveting marks arranged on the outer side walls of the tool bases and punching and riveting tips arranged on the inner side walls of the tool bases. In the using process, the tool body is arranged on the transmission shaft in a sleeving mode; the tool body is rotated, so that the punching-riveting mark is aligned with the line drawing position on the nut; punching and riveting acting force is applied to the upper end face of the tool body till the base binding face is attached to the nut binding face, and at the moment, the punching and riveting tip extrudes the outer protruding thin wall of the nut to form a V-shaped protrusion which is clamped into a shaft groove formed in the transmission shaft; and punching and riveting are stopped, the tool body is taken down, and the punching and riveting process is finished.

Description

TECHNICAL FIELD

[0001] The utility model relates to a nut punch riveting device, concretely relates to a transmission nut punch riveting tool. BACKGROUND

[0002] The nut is one of commonly used fasteners in the transmission. During the vehicle driving, the transmission will be subjected to high and low frequency vibration from the vehicle and the outside, which is easy to cause the nut to produce the loosening phenomenon, and further cause the positioning failure of the key components and other faults. In order to avoid such problems, the punch riveting mode is usually used to strengthen the thread connection effect, and the anti-loosening effect is achieved.

[0003] The structure of the transmission shaft in the existing transmission is generally as shown in Figure 1 The nut structure installed on the transmission shaft is as shown in Figure 2 In the prior art, the punch riveting method for the nut installed on the transmission shaft is that the operator uses the chisel and the copper bar to punch rivet the outer convex thin wall 34 of the nut into the shaft groove 21 on the transmission shaft, forms the V-shaped protrusion 33 which is inwardly recessed and clamped on both sides of the shaft groove, and thus realizes the anti-loosening of the mechanical structure. Although this method is convenient to operate, it has the obvious problem of poor punch riveting effect, because the falling point position of the chisel tip and the punch riveting force of the operator are difficult to control, thus leading to the randomness of the punch riveting effect, which is usually manifested as that the V-shaped protrusions 33 formed after the punch riveting of the same batch of parts are different in shape, or there is a gap between the V-shaped protrusions 33 and the shaft groove 21. The former will cause the large difference in the anti-loosening effect of each transmission nut, and the product quality is difficult to guarantee; the latter will make the V-shaped protrusion 33 be able to move randomly in the shaft groove 21, so that the punch riveting structure no longer has the anti-loosening effect.

[0004] Chinese patent CN207222838U discloses a nut punch riveting device for accurate positioning, which uses an improved pressure head structure, sets the punch pin and the material return spring in the pressure head, realizes the accurate guiding and positioning of the nut during the conveying process, and thus avoids the deviation of the nut installation position; however, this scheme is not applicable to the positioning of the nut sleeved on the transmission shaft of the transmission, and does not solve the problem that the punch riveting falling point position and the punch riveting force are difficult to control during the punch riveting process. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to solve the problem that the punch riveting falling point position and the punch riveting force are difficult to control when the nut on the transmission shaft of the transmission is punch riveted by using the prior art, and thus a transmission nut punch riveting tool is provided.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solution:

[0007] A transmission nut punch riveting tool, which is characterized in that:

[0008] The tool body is circular annular, a tool inner hole is axially formed in the center, the diameter of the tool inner hole is smaller than the outer diameter of the outer convex thin wall of the nut to be punched and riveted, and is matched with the diameter of the stepped shaft provided with the shaft groove on the transmission shaft; the transmission shaft is the transmission shaft of the transmission device for mounting the nut to be punched and riveted;

[0009] A plurality of tool bases are uniformly arranged on the lower end surface of the tool body in the circumferential direction, and the diameter of the virtual cylindrical space formed by the inner side walls of the plurality of tool bases is greater than the diameter of the tool inner hole; the lower end surface of each tool base is defined as a base fitting surface, and the base fitting surface is used for fitting with the nut fitting surface on the outer side of the nut to be punched and riveted.

[0010] A conical punch riveting tip is arranged on the inner side wall of each tool base, the arrangement position of the punch riveting tip corresponds to the arrangement position of the shaft groove on the transmission shaft in the circumferential direction, and the distance between the inner side end of the punch riveting tip and the center axis of the tool body is smaller than the distance between the outer wall of the outer convex thin wall of the nut to be punched and riveted and the center axis.

[0011] A punch riveting mark is arranged on the middle position of the outer side wall of at least one of the plurality of tool bases, and is used for corresponding to the line drawing position of the center position of the corresponding shaft groove on the nut to be punched and riveted when the nut to be punched and riveted is punched and riveted.

[0012] Further, a plurality of punch riveting ears are symmetrically arranged on the outer side wall of the tool body in the circumferential direction; the upper end surface of each punch riveting ear and the upper end surface of the tool body are located on the same plane.

[0013] Further, the outer side of each punch riveting ear is a circular arc structure.

[0014] Further, the punch riveting mark is an arrow pointing to the base fitting surface.

[0015] Further, the distance between the inner side of each punch riveting tip and the center axis of the tool body gradually decreases from the base fitting surface to the bottom surface of the tool body.

[0016] Further, a guide surface is processed on the inner side of each punch riveting tip close to the base fitting surface.

[0017] Further, the outer side wall of each tool base is flush with the outer side wall of the tool body.

[0018] Compared with the prior art, the tool has the following beneficial effects:

[0019] 1. The drop point position can be ensured: the diameter of the tool inner hole is matched with the diameter of the corresponding position of the stepped shaft provided with the shaft groove on the transmission shaft, the line drawing position of the mark on the nut is aligned with the center of the shaft groove, and the punch riveting mark is aligned with the line drawing position on the nut, so that the drop point position of each punch riveting can be accurately ensured to be the same.

[0020] 2. Controllable riveting force: During the riveting process, the operator uses CNC equipment such as a vibratory gun or press to act on the upper surface of the tooling body. The riveting force can be adjusted by controlling the force applied by the CNC equipment. When the base mating surface of the tooling base is mated with the nut mating surface, it indicates that the riveting is completed, thus ensuring that the duration of each riveting action is the same.

[0021] 3. Standardization of riveting effect: The V-shaped protrusion formed by the thin wall of the nut under external force is controlled by the shape of the riveting tip set on the tooling base, thereby ensuring that the shape characteristics of all the V-shaped protrusions formed by riveting are uniform and achieving standardization of riveting effect.

[0022] 4. Structural interference can be avoided: During the riveting process, the riveting tip only applies force to the thin wall of the nut, avoiding problems such as shoulder damage caused by operational errors during the riveting process in traditional riveting methods, and effectively preventing collisions between the tooling body and other parts on the drive shaft. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the transmission shaft structure in the background art;

[0024] Figure 2 This is a schematic diagram of the structure of a nut in the background art;

[0025] Figure 3 This is a schematic diagram of the structure of an embodiment of the gearbox nut stamping and riveting fixture of this utility model;

[0026] Figure 4 This is a schematic diagram of the assembly position of an embodiment of the gearbox nut riveting fixture of this utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1-Tooling body; 11-Tooling base; 12-Punching tip; 13-Guide surface; 14-Tooling inner hole; 15-Punching mark; 16-Punching ear; 17-Base mating surface; 2-Drive shaft; 21-Shaft groove; 3-Nut; 31-Marked position; 32-Nut mating surface; 33-V-shaped protrusion; 34-Outwardly convex thin wall; 35-Outward chamfer. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] A gearbox nut stamping and riveting fixture, the specific structure of which is as follows: Figure 3As shown, including a circular tool body 1; the center of the tool body 1 is provided with a tool inner hole 14 along the axial direction; in this embodiment, the shape of the tool inner hole 14 should be set according to the stepped shaft shape of the transmission shaft 2 provided with the shaft groove 21, so that the inner diameter of the tool inner hole 14 matches the diameter of the stepped shaft provided with the shaft groove 21, and is smaller than the outer diameter of the outer convex thin wall 34 on the nut 3 to be punched and riveted, thereby preliminarily positioning the punching and riveting position; the transmission shaft 2 and the nut 3 are the transmission shaft and the nut installed on the transmission shaft in the existing transmission in the background art, and the specific structure is as shown in Figure 1 、 Figure 2 As shown, the transmission shaft 2 is provided with two axial grooves 21 symmetrically along the circumference, and the nut 3 is provided with an outer convex thin wall 34, and the outer convex thin wall 34 is provided with an outer chamfer 35;

[0031] The lower end surface of the tool body 1 is provided with two tool bases 11 symmetrically along the circumference, and the lower end surface of each tool base 11 is defined as a base fitting surface 17; in this embodiment, the outer side wall of each tool base 11 is flush with the outer side wall of the tool body 1;

[0032] One of the tool bases 11 is provided with a punch rivet mark 15 at the middle position of the outer side wall, and the punch rivet mark 15 is an arrow pointing to the base fitting surface 17; each tool base 11 is provided with a conical punch rivet tip 12 on the inner side wall, and the setting position of the punch rivet tip 12 corresponds to the position of the shaft groove 21 on the transmission shaft 2 in the circumference, and the distance between the inner side of the punch rivet tip 12 and the center axis of the tool body 1 is smaller than the distance between the outer wall of the outer convex thin wall 34 on the nut 3 to be punched and riveted and the center axis; the distance between the inner side of each punch rivet tip 12 and the center axis of the tool body 1 gradually decreases from the base fitting surface 17 to the bottom surface of the tool body 1;

[0033] The inner side of each punch rivet tip 12 is provided with a guide surface 13 at the position close to the base fitting surface 17; the angle of the guide surface 13 should be set according to the outer chamfer 35 of the outer convex thin wall 34 of the nut 3 to be punched and riveted, and is used to guide the punch rivet tip 12 to fit with the outer convex thin wall 34 when the tool body 1 is installed;

[0034] The outer side wall of the tool body 1 is also provided with two punch rivet ears 16 symmetrically along the circumference, and the upper end surface of each punch rivet ear 16 is located on the same plane as the upper end surface of the tool body 1.

[0035] The specific use method of the transmission nut punch riveting tool in this embodiment is as follows:

[0036] As shown in Figure 4 , and referring to Figures 1-3, the bearing and the nut 3 are sequentially sleeved on the transmission shaft 2 in the outward spline direction of the bevel gear, before the punch riveting, the position to be punch riveted is determined on the outer convex thin wall 34 of the nut 3, the position to be punch riveted should coincide with the center position of the shaft groove 21 arranged on the transmission shaft 2; the line mark is drawn on the outer convex thin wall 34, and the line mark is the line mark position 31 in Figure 3 , the line mark position 31 is from the outer convex thin wall 34, passes through the nut abutting surface 32, and extends to the outer side wall of the nut 3;

[0037] The tool body 1 is sleeved on the transmission shaft 2, the arrow of the punch riveting mark 15 points to the nut abutting surface 32; the tool body 1 is rotated and adjusted until the arrow of the punch riveting mark 15 is aligned with the line mark position 31 on the nut 3; at this time, the guide surface 13 machined on the punch riveting tip 12 should be abutted with the outer chamfer 35 machined on the outer convex thin wall 34 of the nut 3;

[0038] The downward punch riveting force is applied to the upper end surface of the tool body 1, the nut is punch riveted until the base abutting surface 17 is abutted with the nut abutting surface 32; in the process, the punch riveting tip 12 moves downward, extrudes the outer convex thin wall 34, and forms the V-shaped protrusion 33 on the outer convex thin wall 34; when the base abutting surface 17 is abutted with the nut abutting surface 32, the V-shaped protrusion 33 formed by the punch riveting on the outer convex thin wall 34 is just clamped into the shaft groove 21, at this time, the side wall of the tool inner hole 14 should be abutted with the outer wall of the stepped shaft where the shaft groove 21 is located; the punch riveting is stopped, and the tool body 1 is taken off, and the punch riveting process is ended.

[0039] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them, for ordinary professional technicians in the art, the specific technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions protected by the present application.

Claims

1. A transmission nut punch riveting tool, characterized in that: it comprises a tool body (1); the tool body (1) is annular, a tool inner hole (14) is axially formed in the center, the diameter of the tool inner hole (14) is smaller than the outer diameter of the outer convex thin wall (34) of the nut (3) to be punched and riveted, and is matched with the stepped shaft diameter of the shaft groove (21) provided on the transmission shaft (2); the transmission shaft (2) is the transmission shaft of the transmission to be installed with the nut (3) to be punched and riveted; a plurality of tool bases (11) are uniformly arranged on the lower end surface of the tool body (1) in the circumferential direction; the virtual cylindrical space formed by the inner side wall of the tool base (11) has a diameter larger than that of the tool inner hole (14); the lower end surface of each tool base (11) is defined as a base fitting surface (17), and the base fitting surface (17) is used to fit with the nut fitting surface (32) on the outer side of the nut (3) to be punched and riveted; a punch riveting tip (12) is arranged at the middle position of the inner side wall of each tool base (11); the arrangement position of the punch riveting tip (12) corresponds to the position of the shaft groove (21) provided on the transmission shaft (2) in the circumferential direction; and the distance between the inner side end of the punch riveting tip (12) and the center axis of the tool body (1) is smaller than the distance between the outer wall of the outer convex thin wall (34) of the nut (3) to be punched and riveted and the center axis; a punch riveting mark (15) is arranged at the middle position of the outer side wall of at least one of the plurality of tool bases (11), and is used to correspond to the line position (31) of the center position of the corresponding shaft groove (21) on the nut (3) to be punched and riveted when the nut (3) to be punched and riveted is punched and riveted.

2. The transmission nut punch riveting tool according to claim 1, characterized in that: a plurality of punch riveting ears (16) are symmetrically arranged on the outer side wall of the tool body (1) in the circumferential direction; and the upper end surface of each punch riveting ear (16) and the upper end surface of the tool body (1) are located on the same plane.

3. The transmission nut punch riveting tool according to claim 2, characterized in that: the outer side of each punch riveting ear (16) is in a circular arc structure.

4. The transmission nut punch riveting tool according to claim 1, characterized in that: the punch riveting mark (15) is an arrow pointing to the base fitting surface (17).

5. The transmission nut punch riveting tool according to claim 1, characterized in that: the distance between the inner side of each punch riveting tip (12) and the center axis of the tool body (1) gradually decreases from the base fitting surface (17) to the bottom surface of the tool body (1).

6. The transmission nut punch riveting tool according to claim 1, characterized in that: a guide surface (13) is processed at the position close to the base fitting surface (17) on the inner side of each punch riveting tip (12).

7. The transmission nut punch riveting tool according to claim 1, characterized in that: the outer side wall of each tool base (11) is flush with the outer side wall of the tool body (1). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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