Riveting tool for spring set

Abstract

The utility model provides a riveting tool used for a spring set, which comprises an upper module and a lower module matched with the upper module, the lower module comprises a base and a flowering thimble protruding out of the top of the base, the upper module comprises a pressure head seat and a solid thimble protruding out of the bottom of the pressure head seat, the solid ejector pin can extrude the head part of the flowering ejector pin to open when moving along the inner cavity of the flowering ejector pin, and the flowering ejector pin comprises a first base body, an expansion section arranged at the end part of the first base body and a fitting part arranged at the end part of the expansion section. The pressing head base is connected with the servo motor so that the pressing distance of the pressing head base can be controlled, the blooming ejector pin is arranged on the inner side of the riveting boss, and when the solid ejector pin moves along an inner cavity of the blooming ejector pin, the head of the blooming ejector pin can be extruded to be opened, so that a steel sheet of the riveting boss is driven to make contact with the inner side of the compression spring; therefore, the riveting effect of the compression group is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of spring group processing, in particular to a riveting tool for a spring group. Background Art

[0002] The spring group is a combination spring formed by riveting multiple compression springs together through two steel sheets, which provides elastic force for the shift piston of the automatic transmission of the car. Since the spring group is assembled with multiple springs, its advantages are small longitudinal space and large adjustability of lateral dimensions, which can be adjusted according to the size of the gearbox shift piston. At the same time, it can provide a large elastic force for the gearbox shift piston in a very small longitudinal movement distance, which reduces the movement stroke of the piston, reduces the shifting time, improves the driving experience of the car and reduces fuel consumption.

[0003] The traditional riveting method of spring assembly is to fix the compression spring and steel sheet together through interference fit. There are two common interference fit methods. The principle is that the size of the steel sheet riveting position is larger than the inner diameter of the compression spring, and the steel sheet and compression spring are fixed together through interference fit by applying pressure in the vertical direction. This riveting method is prone to the following problems: 1. When the size of the steel sheet riveting position is smaller than or similar to the inner diameter of the compression spring, the riveting force is insufficient, and the steel sheet and the compression spring are easily separated during the use of the spring group; 2. When the size of the steel sheet riveting position is too large, the steel sheet riveting position and the compression spring are easily deformed, and even the steel sheet and the compression spring cannot be riveted and fixed; 3. In actual production, due to the size fluctuations of the steel sheet and the compression spring, the same spring group will have missing rivets and incomplete rivets when riveting and assembling the steel sheet and the compression spring; 4. When missing rivets and incomplete rivets occur in a spring group, the height of each compression spring in the spring group will be different, causing the steel sheet to warp and deform, and the upper and lower steel sheets of the spring group will be misaligned, and cannot be installed normally in the gearbox. If the spring with warped and misaligned steel sheets is assembled into the gearbox, the shift piston position will be offset, thereby affecting the vehicle's shifting stability and reducing the service life of the gearbox. The above situations will affect the installation of the spring group in the gearbox and the normal use of the gearbox, reduce the service life of the gearbox, and thus affect the normal use and safety of the car. Utility Model Content

[0004] In order to solve the above technical problems, the utility model designs a new riveting method for spring assemblies. The new riveting method eliminates the mutual extrusion between the steel sheet and the compression spring during riveting, so that the steel sheet and the compression spring do not need to be riveted and fixed by interference fit, that is, the riveting tooling including the blooming ejector pin and the solid ejector pin is redesigned, and the blooming ejector pin and the solid ejector pin are squeezed against each other to increase the outer diameter of the blooming ejector pin, thereby increasing the size of the riveting position of the steel sheet, thereby achieving the effect of mutual riveting of the steel sheet and the compression spring. The specific technical scheme is as follows:

[0005] A riveting tool for a spring group comprises an upper die group and a lower die group cooperating with the upper die group, wherein the lower die group comprises a base and a blooming ejector protruding from the top of the base, and the upper die group comprises a pressure head seat and a solid ejector protruding from the bottom of the pressure head seat, wherein the solid ejector can squeeze the head of the blooming ejector to open when moving along the inner cavity of the blooming ejector.

[0006] Preferably, the blooming ejector pin comprises a first base, an expansion section arranged at an end of the first base, and a fitting portion arranged at an end of the expansion section.

[0007] Preferably, the expansion segments are provided in a plurality and are evenly distributed along the axial circumference of the first substrate, and the inner sides of the plurality of expansion segments can be expanded radially along the first substrate under the effect of compression.

[0008] Preferably, the fitting portion includes an inner concave portion recessed from the end of the expansion section toward the radial inner side of the first substrate and a convex portion protruding from the inner concave portion toward the radial outer side of the first substrate.

[0009] Preferably, the solid ejector pin comprises a second base body and an extrusion portion which is arranged at an end of the second base body and can extrude the expansion section to open.

[0010] Preferably, the outer diameter of the extrusion portion is greater than the outer diameter of the protrusion.

[0011] Preferably, the riveting tool for the spring assembly further includes a riveting boss, the flower-shaped ejector pin is placed inside the riveting boss, and when the flower-shaped ejector pin is squeezed by the solid ejector pin, the fitting portion at the end thereof squeezes the riveting boss to achieve riveting with the spring.

[0012] It can be seen from the above technical scheme that the utility model has the following beneficial effects: the utility model designs a new riveting method for a spring group, which eliminates the mutual extrusion between the steel sheet and the compression spring when riveting, that is, redesigns the shape of the riveting position of the steel sheet so that it and the compression spring do not need to be riveted and fixed by interference fit. Specifically, the spring group riveting tooling including the blooming ejector and the solid ejector is redesigned, and the outer diameter of the blooming ejector is increased by squeezing the blooming ejector and the solid ejector against each other. In this way, since the outer diameter of the blooming ejector becomes larger, the size of the riveting position of the steel sheet is increased, thereby achieving the effect of mutual riveting of the steel sheet and the compression spring. In addition, the utility model also redesigns the spring group assembly production line, that is, designs a new base and a pressure head seat, connects the pressure head seat and the equipment servo motor, and moves the pressure head seat in the vertical direction to achieve the effect of automatic riveting of the spring group. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is a structural diagram of the connection between the base and the flower top pin;

[0015] Figure 3 It is a structural schematic diagram of the connection between the pressure head seat and the solid ejector pin;

[0016] Figure 4 This is a schematic diagram of the structure of the flowering thimble;

[0017] Figure 5 It is a structural schematic diagram of a solid ejector pin;

[0018] Figure 6 It is a schematic diagram of the structure of a solid ejector pin extruding a blooming ejector pin;

[0019] Figure 7 It is a structural schematic diagram of the riveted spring of the utility model.

[0020] In the figure: 10, base; 20, flowering ejector; 210, first base; 220, expansion section; 230, fitting portion; 231, inner recess; 232, protrusion; 30, pressure head seat; 40, solid ejector; 410, second base; 420, extrusion portion; 50, riveting boss; 60, servo motor. DETAILED DESCRIPTION

[0021] The following is a detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments. Before describing in detail the technical solutions of each embodiment of the present invention, the nouns and terms involved are explained. In this specification, components with the same name or the same number represent similar or identical structures and are only for illustrative purposes.

[0022] To achieve the above purpose, the embodiments of the present invention provide the following technical solutions: Figure 1 , Figure 2 , Figure 3 A riveting tool for a spring group includes an upper die group and a lower die group cooperating with the upper die group. Further, the lower die group includes a base 10 and a flowering ejector pin 20, the flowering ejector pin 20 is arranged protruding from the top of the base. Specifically, a receiving groove can be opened inside the base, and the flowering ejector pin is fixedly installed in the receiving groove, and the flowering ejector pin is arranged on the base according to the number and shape of the compression springs of the spring group. Correspondingly, the upper die group includes a pressure head seat 30 and a solid ejector pin 40, the solid ejector pin is arranged protruding from the bottom of the pressure head seat, and when the solid ejector pin 40 is installed, an installation groove can also be opened inside the pressure head seat, and The solid ejector pin is fixedly installed in the mounting groove, and the solid ejector pin is also fixed on the pressure head seat according to the number and shape of the compression springs in the spring group. It should be noted that the riveting tool also includes a riveting boss 50. When in use, the riveting boss 50 including the steel sheet is placed on the base, and the pressure head seat is connected to the servo motor 60 so that the downward pressing distance of the pressure head seat can be controlled. The blooming ejector pin 20 is placed on the inner side of the riveting boss, and when the solid ejector pin moves along the inner cavity of the blooming ejector pin, the head of the blooming ejector pin can be squeezed to open, thereby driving the steel sheet of the riveting boss to contact the inner side of the compression spring to achieve the riveting effect of the compression spring.

[0023] Reference Figure 4 As a preferred technical solution of this embodiment, the flowering ejector pin 20 includes a first substrate 210, an expansion section 220 and a fitting portion 230. The expansion section 220 is integrally formed with the substrate, and the expansion section is arranged at the end of the first substrate. The fitting portion 230 is integrally formed with the expansion section, and the fitting portion is arranged at the end of the expansion section. It should be noted that the first substrate is a solid structure, the expansion section is a cylindrical structure with a cavity inside, and the expansion section can be made of easily deformable metal, such as steel, aluminum alloy and other materials. In this way, when the inner side of the expansion section is squeezed by the solid ejector pin, it can open from the axial direction of the substrate to the outside, thereby driving the steel sheet to achieve riveting of the steel sheet and the compression spring.

[0024] Furthermore, the expansion segments 220 are configured to be multiple and evenly distributed along the axial circumference of the first substrate 210. Specifically in this embodiment, the number of the expansion segments is four, and the inner sides of the four expansion segments can be squeezed to expand radially along the first substrate and fit against the inner side of the steel sheet. In this way, the four expansion segments form a cross-shaped structure when not squeezed. Therefore, when there are four expansion segments, the flowering ejector is a cross-shaped ejector structure.

[0025] Furthermore, the fitting portion 230 includes an inner recess 231 and a protruding portion 232. The inner recess 231 is formed by being recessed from the end of the expansion section 220 toward the radial inner side of the first substrate 210, and the protruding portion 232 is formed by being protruded from the inner recess toward the radial outer side of the first substrate. The presence of the inner recess and the protruding portion can expand when squeezed to fit with the inner wall of the steel sheet, thereby effectively squeezing the steel sheet to achieve riveting between the steel sheet and the compression spring.

[0026] Reference Figure 5 As a preferred technical solution of this embodiment, the solid ejector pin 40 includes a second base body 410 and an extrusion portion. The extrusion portion 420 is arranged at the end of the second base body, and the extrusion portion can extrude the expansion section 220 to open. It should be noted that the extrusion portion is a pointed structure, and in order to achieve effective extrusion of the expansion portion, the outer diameter of the extrusion portion 420 is greater than the outer diameter of the protrusion 232.

[0027] Reference Figure 5 , Figure 6 When in use, the riveting boss is placed on the base, and the pressure head seat is connected to the servo motor so that the downward pressing distance of the pressure head seat can be controlled. The flowering ejector pin 20 is placed on the inner side of the riveting boss. When the pressure head seat is driven to move by the servo motor, the solid ejector pin is driven to squeeze the inner side of the flowering ejector pin. When the flowering ejector pin is squeezed by the solid ejector pin, the fitting part at its end squeezes the riveting boss to realize the riveting of the steel sheet and the spring of the riveting boss.

[0028] The above-described embodiments are merely descriptions of preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A riveting tool for a spring assembly, comprising an upper die set and a lower die set cooperating with the upper die set, characterized in that: The lower mold assembly comprises a base (10) and a flowering ejector pin (20) protruding from the top of the base, and the upper mold assembly comprises a pressure head seat (30) and a solid ejector pin (40) protruding from the bottom of the pressure head seat, wherein the solid ejector pin can squeeze the flowering ejector pin head to open when moving along the inner cavity of the flowering ejector pin.

2. The riveting tool for a spring assembly according to claim 1, characterized in that: The flowering ejector pin (20) comprises a first base body (210), an expansion section (220) arranged at the end of the first base body, and a fitting portion (230) arranged at the end of the expansion section.

3. The riveting tool for a spring assembly according to claim 2, characterized in that: The expansion segments (220) are arranged in a plurality and are evenly distributed along the axial circumference of the first substrate (210), and the inner sides of the plurality of expansion segments are squeezed to expand radially along the first substrate.

4. The riveting tool for a spring assembly according to claim 3, characterized in that: The fitting portion (230) comprises an inner recess (231) recessed radially inwardly from the end of the expansion section (220) toward the first base body (210), and a protruding portion (232) protruding radially outwardly from the inner recess.

5. The riveting tool for a spring assembly according to claim 4, characterized in that: The solid ejector pin (40) comprises a second base body (410) and an extrusion portion (420) arranged at the end of the second base body and capable of extruding the expansion section (220) to open.

6. The riveting tool for a spring assembly according to claim 5, characterized in that: The outer diameter of the extrusion portion (420) is greater than the outer diameter of the protrusion (232).

7. The riveting tool for a spring assembly according to claim 2, characterized in that: The riveting tool for the spring assembly also includes a riveting boss (50), the flower-shaped ejector pin (20) is placed inside the riveting boss, and when the flower-shaped ejector pin is squeezed by the solid ejector pin, the fitting portion at the end of the flower-shaped ejector pin squeezes the riveting boss to achieve riveting with the spring.

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