A riveting tool for a master cylinder piston

Abstract

The utility model discloses a kind of riveting tool of master cylinder piston, including master cylinder piston, spring installation cavity, master cylinder piston guide rod, spring seat, master cylinder piston return spring and riveting mechanism, spring installation cavity is set in master cylinder piston one end, master cylinder piston guide rod is fixed at the center of spring installation cavity, spring seat is slidably connected on master cylinder piston guide rod, master cylinder piston is set in riveting mechanism.In the utility model, limit master cylinder piston by piston press-fit base, and spring pre-pressing limit seat is set in the outside of piston press-fit base, then make spring seat and punch rod can be located on same axis, and limit the position between piston press-fit base and spring pre-pressing limit seat by limit pin, guarantee accuracy, again by punch rod stamping, upset on master cylinder piston guide rod step end face, realize riveting operation, complete riveting operation, simply and efficiently also effectively improve accuracy.

Description

Technical Field

[0001] This utility model relates to a riveting fixture, specifically a riveting fixture for a master cylinder piston, and belongs to the field of riveting fixture technology. Background Technology

[0002] In hydraulic systems, the master cylinder piston is widely used, and structurally, there are many types. Currently, most brake master cylinders adopt structures such as... Figure 1 The structure shown has a master cylinder piston return spring, a spring seat, a limiting washer, and a limiting screw installed sequentially in the master cylinder piston. Since the master cylinder piston return spring is initially in a pre-compressed state, the spring seat is needed to limit the pre-compressed height. We often use limiting washer and limiting screw to limit the position of the spring seat. However, in actual use, due to mechanical vibration, the limiting screw is easy to loosen, and the limiting height of the spring seat is prone to change or the limiting fails, causing safety risks in use.

[0003] To address this issue, the existing limiting mechanism of the master cylinder piston return spring has been optimized, such as... Figure 2 The structure shown uses a stamping and upsetting method to rivet the limiting shim to the master cylinder piston guide rod, reducing the risk of the limiting screw loosening. From the perspective of assembly, this structure of the master cylinder piston seems simple and reduces the risk of the limiting screw loosening, thus lowering production costs. However, from the perspective of riveting method, since the upper limit surface of the master cylinder piston guide rod needs to be upsetting, if a stamping rod is used alone for riveting, it is easy to cause uneven force on the upper limit surface of the master cylinder piston guide rod, resulting in the skew of the limiting shim, which in turn causes the master cylinder piston return spring to skew, affecting the stability of the master cylinder piston during use.

[0004] In addition, in a piston-type brake master cylinder piston assembly riveting device disclosed, for example, in CN117505688A, although the spring of the piston assembly is compressed by using a clamping mechanism and a pressing mechanism to quickly achieve the purpose of installing the washer, the above-mentioned problem is not completely solved. Summary of the Invention

[0005] This utility model provides a solution that is significantly different from existing technologies, addressing the problem that existing technologies are too simplistic. Specifically, the purpose of this utility model is to solve the aforementioned shortcomings of existing technologies by proposing a riveting fixture for the master cylinder piston.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A riveting fixture for a master cylinder piston includes a master cylinder piston, a spring mounting cavity, a master cylinder piston guide rod, a spring seat, a master cylinder piston return spring, and a riveting mechanism. The spring mounting cavity is located at one end of the master cylinder piston, the master cylinder piston guide rod is fixed at the center of the spring mounting cavity, the spring seat is slidably connected to the master cylinder piston guide rod, the master cylinder piston return spring is sleeved on the outside of the master cylinder piston guide rod and the spring seat, and the master cylinder piston is located inside the riveting mechanism.

[0008] The riveting mechanism includes a piston press-fit base, a main cylinder piston mounting hole, a spring preload limit seat, a mating cavity, a stamping rod guide hole, and a stamping rod. The main cylinder piston mounting hole is located at the top center of the piston press-fit base, and the main cylinder piston is placed inside the main cylinder piston mounting hole. The mating cavity is located inside the spring preload limit seat, and the piston press-fit base is slidably connected to the mating cavity. The stamping rod guide hole is located at the top center of the spring preload limit seat and communicates with the mating cavity. The stamping rod is slidably mated inside the stamping rod guide hole and is located above the spring seat.

[0009] As a further embodiment of this utility model, the riveting mechanism also includes a first limiting pin guide groove, a limiting pin, and a first docking groove. The first limiting pin guide groove is disposed on the spring preload limiting seat and communicates with the docking cavity. The first docking groove is recessed on the outer wall of the piston press base. One end of the limiting pin passes through the first limiting pin guide groove and docks in the first docking groove.

[0010] As a further improvement of this utility model, the outer wall of the piston press base is also provided with a second docking groove, the second docking groove having the same diameter as the first docking groove and located at the bottom of the first docking groove.

[0011] As a further improvement of this utility model, a groove is provided at the connection between the docking cavity and the guide hole of the stamping rod, and the groove has a stepped structure.

[0012] As a further improvement of this utility model: a riveting hole is provided at one end of the stamping rod located inside the stamping rod guide hole, and the riveting hole has a conical structure.

[0013] As a further embodiment of this utility model: a limiting disk is coaxially provided at one end of the spring seat located outside the main cylinder piston, one end of the main cylinder piston reset spring abuts against the limiting disk, and the diameter of the limiting disk is smaller than the spring mounting cavity.

[0014] The beneficial effects of this utility model are:

[0015] In this invention, the piston of the main cylinder is limited by a piston press-fit base, and a spring preload limit seat is sleeved on the outside of the piston press-fit base, so that the spring seat and the stamping rod can be located on the same axis. The position between the piston press-fit base and the spring preload limit seat is limited by a limit pin to ensure accuracy. Then, the stamping rod is used to stamp and upset the upper stepped end face of the main cylinder piston guide rod to realize the riveting operation and complete the riveting operation. It is simple and efficient, and also effectively improves accuracy. It also ensures that the upper stepped end face of the main cylinder piston guide rod is evenly stressed during riveting, which effectively avoids the problem of shim skewing, which would eventually cause the main cylinder piston return spring to skew and affect the stability of the main cylinder piston during use. Attached Figure Description

[0016] Figure 1 A schematic diagram of the existing master cylinder piston return spring mounting structure;

[0017] Figure 2 A schematic diagram of the limiting method for the improved master cylinder piston return spring;

[0018] Figure 3 This is a schematic diagram of the overall cross-sectional structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the main cylinder piston structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the spring preload limiting seat structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the piston press-fit base structure of this utility model;

[0022] Figure 7 This is a schematic diagram of the stamping rod structure of this utility model;

[0023] In the diagram: 1. Master cylinder piston; 2. Spring mounting cavity; 3. Master cylinder piston guide rod; 4. Spring seat; 5. Master cylinder piston return spring; 6. Riveting mechanism; 61. Piston press-fit base; 62. Master cylinder piston mounting hole; 63. Spring preload limit seat; 64. Docking cavity; 65. Stamping rod guide hole; 66. Stamping rod; 67. First limit pin guide groove; 68. Limiting pin; 69. First docking groove; 610. Second docking groove; 611. Slot; 612. Riveting hole. Detailed Implementation

[0024] 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.

[0025] Example 1, as Figures 3 to 7 As shown, a riveting fixture for a master cylinder piston includes a master cylinder piston 1, a spring mounting cavity 2, a master cylinder piston guide rod 3, a spring seat 4, a master cylinder piston return spring 5, and a riveting mechanism 6. The spring mounting cavity 2 is located at one end of the master cylinder piston 1, the master cylinder piston guide rod 3 is fixed at the center of the spring mounting cavity 2, the spring seat 4 is slidably connected to the master cylinder piston guide rod 3, the master cylinder piston return spring 5 is sleeved on the outside of the master cylinder piston guide rod 3 and the spring seat 4, and the master cylinder piston 1 is located inside the riveting mechanism 6.

[0026] The riveting mechanism 6 includes a piston press-fit base 61, a main cylinder piston mounting hole 62, a spring preload limit seat 63, a docking cavity 64, a stamping rod guide hole 65, and a stamping rod 66. The main cylinder piston mounting hole 62 is located at the top center of the piston press-fit base 61, and the main cylinder piston 1 is placed in the main cylinder piston mounting hole 62. The docking cavity 64 is located in the spring preload limit seat 63, and the piston press-fit base 61 is slidably connected to the docking cavity 64. The stamping rod guide hole 65 is located at the top center of the spring preload limit seat 63 and communicates with the docking cavity 64. The stamping rod 66 is slidably docked in the stamping rod guide hole 65 and is located above the spring seat 4.

[0027] The riveting mechanism 6 also includes a first limiting pin guide groove 67, a limiting pin 68, and a first docking groove 69. The first limiting pin guide groove 67 is disposed on the spring preload limiting seat 63 and communicates with the docking cavity 64. The first docking groove 69 is recessed on the outer wall of the piston press-fitting base 61. One end of the limiting pin 68 passes through the first limiting pin guide groove 67 and docks in the first docking groove 69. The outer wall of the piston press-fitting base 61 is also provided with a second docking groove 610. The second docking groove 610 has the same diameter as the first docking groove 69 and is located at the bottom of the first docking groove 69.

[0028] In this invention, the piston press-fit base 61 limits the position of the main cylinder piston 1, and the spring preload limit seat 63 is sleeved on the outside of the piston press-fit base 61, so that the spring seat 4 and the stamping rod 66 can be located on the same axis. The position between the piston press-fit base 61 and the spring preload limit seat 63 is limited by the limit pin 68 to ensure accuracy. Then, the stamping rod 66 is used to stamp and upset the upper stepped end face of the main cylinder piston guide rod 3 to realize the riveting operation and complete the riveting operation. It is simple and efficient, and also effectively improves the accuracy. It also ensures that the upper stepped end face of the main cylinder piston guide rod 3 is evenly stressed during riveting, which effectively avoids the problem of shim skewing, which would eventually cause the main cylinder piston return spring 5 to skew and affect the stability of the main cylinder piston 1 during use.

[0029] Example 2, as Figures 3 to 7 As shown, in addition to all the technical features included in Embodiment 1, this embodiment also includes:

[0030] A slot 611 is provided at the connection between the mating cavity 64 and the stamping rod guide hole 65. The slot 611 has a stepped structure. The stepped structure can provide a multi-segment positioning reference for the spring seat 4, ensuring that the component moves along a preset trajectory during assembly or movement, and reducing offset error.

[0031] The stamping rod 66 has a riveting hole 612 at one end inside the stamping rod guide hole 65. The riveting hole 612 has a conical structure, which allows the inner wall of the conical hole to disperse the force through a gradual slope during the riveting process. When the riveted part is squeezed, the force will be gradually transmitted from the small end of the hole to the large end, avoiding the local stress concentration of "hard-on-hard" in the straight hole, protecting the end structure of the stamping rod 66 and extending its service life.

[0032] A limiting plate is coaxially provided at one end of the spring seat 4 located outside the master cylinder piston 1. One end of the master cylinder piston return spring 5 abuts against the limiting plate, and the diameter of the limiting plate is smaller than the spring mounting cavity 2. The limiting plate limits the master cylinder piston return spring 5.

[0033] When using this riveting fixture, first install the main cylinder piston 1 into the piston press base 61, and then install the main cylinder piston return spring 5, spring seat 4, and limit shim into the main cylinder piston 1 in sequence. The piston press base 61 has 4 limit pins 68 mating grooves, which facilitates the use of spring seat 4 to limit the position of spring pre-press limit seat 63 when spring seat 4 is pre-pressed.

[0034] Install the spring preload limit seat 63 onto the piston press-fit base 61, and press down the spring preload limit seat 63 so that the first limit pin guide groove 67 is aligned with the first mating groove 69 on the piston press-fit base 61.

[0035] Insert the limit pin 68 into the first docking groove 69 to ensure that the preload height of the master cylinder piston return spring 5 is consistent.

[0036] The stamping rod 66 is inserted into the stamping rod guide hole 65, and the upper stepped end face of the main cylinder piston guide rod 3 is upset by impact force, so that the limiting shim is riveted to the main cylinder piston guide rod 3.

[0037] When the master cylinder piston assembly is working, the end face of the spring seat 4 is fixed and under the action of hydraulic thrust, the master cylinder piston 1 is pushed forward, the master cylinder piston return spring 5 is compressed, and the master cylinder piston guide rod 3 moves back and forth in the spring seat 4 to ensure that the master cylinder piston 1 outputs pressure normally. When the push rod pressure is released, the master cylinder piston return spring 5 makes the master cylinder piston 1 return to the initial pre-pressure state.

[0038] 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.

[0039] 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 riveting fixture for a master cylinder piston, comprising a master cylinder piston (1), a spring mounting cavity (2), a master cylinder piston guide rod (3), a spring seat (4), a master cylinder piston return spring (5), and a riveting mechanism (6), characterized in that, The spring mounting cavity (2) is located at one end of the main cylinder piston (1), the main cylinder piston guide rod (3) is fixed at the center of the spring mounting cavity (2), the spring seat (4) is slidably connected to the main cylinder piston guide rod (3), the main cylinder piston reset spring (5) is sleeved on the outside of the main cylinder piston guide rod (3) and the spring seat (4), and the main cylinder piston (1) is located inside the riveting mechanism (6); The riveting mechanism (6) includes a piston press-fit base (61), a main cylinder piston mounting hole (62), a spring preload limit seat (63), a docking cavity (64), a stamping rod guide hole (65), and a stamping rod (66). The main cylinder piston mounting hole (62) is located at the top center of the piston press-fit base (61). The main cylinder piston (1) is placed in the main cylinder piston mounting hole (62). The docking cavity (64) is located in the spring preload limit seat (63). The piston press-fit base (61) is slidably connected in the docking cavity (64). The stamping rod guide hole (65) is located at the top center of the spring preload limit seat (63) and communicates with the docking cavity (64). The stamping rod (66) is slidably docked in the stamping rod guide hole (65) and is located above the spring seat (4).

2. The riveting fixture according to claim 1, characterized in that: The riveting mechanism (6) further includes a first limiting pin guide groove (67), a limiting pin (68) and a first docking groove (69). The first limiting pin guide groove (67) is disposed on the spring preload limiting seat (63) and communicates with the docking cavity (64). The first docking groove (69) is recessed on the outer wall of the piston press base (61). One end of the limiting pin (68) passes through the first limiting pin guide groove (67) and docks in the first docking groove (69).

3. The swaging tooling of claim 2, wherein: The outer wall of the piston press base (61) is also provided with a second docking groove (610), the second docking groove (610) has the same diameter as the first docking groove (69) and is located at the bottom of the first docking groove (69).

4. The swaging tooling of claim 1, wherein: A slot (611) is provided at the connection between the docking cavity (64) and the stamping rod guide hole (65), and the slot (611) has a stepped structure.

5. The swaging tool of claim 1, wherein: The stamping rod (66) has a riveting hole (612) at one end inside the stamping rod guide hole (65), and the riveting hole (612) has a conical structure.

6. The swaging tool of claim 1, wherein: The spring seat (4) is coaxially provided with a limiting disk at one end outside the main cylinder piston (1). One end of the main cylinder piston reset spring (5) abuts against the limiting disk, and the diameter of the limiting disk is smaller than the spring mounting cavity (2).

Images