Brake master cylinder with novel cup pin structure
By designing a cup pin structure and plastic injection molded parts, the problems of high connection cost and difficult assembly between the brake master cylinder oil cup and the pump body are solved, achieving a low-cost, stable and convenient connection method.
Patent Information
- Application Number
- CN202423023810.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-09
AI Technical Summary
The connection between the oil cup on the brake master cylinder and the pump body is achieved through fastening screws and threaded holes, resulting in high procurement and processing costs, difficult assembly, and a tendency to cause problems such as stripping and misalignment.
The design employs a cup-pin structure, where the oil cup and pump body are connected by a through hole and a pin hole, combined with plastic injection molding and rib design to achieve a stable connection between the oil cup and the pump body.
It reduces processing and procurement costs, simplifies the assembly process, eliminates the need for fastening screws, and ensures the stability and convenience of the connection.
Smart Images
Figure CN223494491U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a brake master cylinder. Background Technology
[0002] The brake master cylinder has a reservoir for storing brake fluid, which is securely connected to the master cylinder body using fastening screws. This requires procuring these fastening screws and machining threaded holes in the master cylinder body for the screws to engage. These fastening screws need to be of relatively high quality to ensure their lifespan and connection stability, resulting in relatively high procurement costs. Although the process of machining threaded holes in the pump body is relatively mature, machining specific threads for each pump body increases processing costs and makes the process more complex. Furthermore, assembling the fastening screws into the screw holes on the pump body is difficult, requiring tools and prone to problems such as stripped threads and misaligned screws. Utility Model Content
[0003] In view of the technical problems existing in the background art, the present invention aims to provide a brake master cylinder with a novel cup pin structure that is relatively low in cost and easy to assemble.
[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a brake master cylinder with a novel cup-pin structure, comprising a pump body and an oil cup, wherein the pump body is provided with an oil inlet, and the oil cup is provided with an oil inlet nozzle, which is inserted into the oil inlet; characterized in that: the oil cup is also provided with a connecting through hole, and the pump body is provided with a connecting pin hole; the oil cup and the pump body are connected by a cup-pin, the cup-pin passing through the connecting through hole, and the cup-pin engaging with the connecting pin hole; the oil cup is provided with a front support leg and a rear support leg, the connecting through holes being respectively provided on the front support leg and the rear support leg, and the connecting pin hole being located between the front support leg and the rear support leg, the connecting pin hole and the connecting through hole forming a pin connection channel.
[0005] The following optimizations or supplementary explanations can be made to the above technical solutions.
[0006] The connecting pin hole is aligned with the connecting through holes on the front and rear support legs.
[0007] For example, the cup pin is made of plastic injection molded parts.
[0008] For example, the rear end of the cup pin is a limiting protrusion, and the front end of the cup pin is an insertion anti-detachment part.
[0009] Further optimization involves adding a raised rib to the pin between the front and rear ends of the cup pin.
[0010] The ribs are arranged axially at the front and rear; the ribs are evenly arranged circumferentially on the pin.
[0011] In addition, two, three, or four raised ribs are provided.
[0012] Additional explanation: The raised rib is a reinforced rib with a pin hole for tightening.
[0013] For example, the insertion anti-detachment part includes an elastic opening and a constricted anti-detachment protrusion. The elastic opening is located at the front end of the cup pin and is set to open forward. The elastic opening is radially through the pin. The constricted anti-detachment protrusion is located on the outer side wall of the front end of the cup pin and is arranged on both sides of the elastic opening.
[0014] In addition, the anti-detachment protrusion body of the constricted anti-detachment protrusion is provided with a side for inserting and pulling constricted.
[0015] The beneficial effects of this utility model are as follows: the brake master cylinder with a novel cup-pin structure includes a cup-pin connection structure, which fixes and assembles the oil cup and pump body through the pin connection structure. Both the cup pin and the connecting pin hole are through holes, simplifying processing and reducing manufacturing costs. Furthermore, the pin connection assembly is simple and convenient, avoiding various problems associated with using fastening screws and screw holes, thus reducing processing costs and simplifying the assembly structure. In addition, the cup-pin structure is optimized to facilitate assembly and prevent detachment. Attached Figure Description
[0016] The following description, in conjunction with the accompanying drawings, details the embodiments and working principles of this utility model.
[0017] Figure 1 This is a schematic diagram of the structure of this utility model.
[0018] Figure 2 for Figure 1 A partial structural cross-sectional view of AA.
[0019] Figure 3 This is a schematic diagram of the fit between the pump body and the cup pin in this utility model.
[0020] Figure 4 This is a schematic diagram of one embodiment of the cup pin in this utility model.
[0021] Figure 5 for Figure 4 A cross-sectional view of BB.
[0022] In the picture:
[0023] 1. Pump body; 10. Oil inlet; 11. Connecting pin hole;
[0024] 2. Oil cup; 20. Oil inlet nozzle; 21. Connecting through hole; 22. Front support leg; 23. Rear support leg;
[0025] 3. Cup pin; 30. Limiting protrusion; 31. Insertion anti-detachment part; 32. Protruding rib;
[0026] 311. Flexible opening; 312. Anti-detachment protrusion at the narrow opening; 3121. Side guide for insertion and removal at the narrow opening. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the implementation of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.
[0028] Referring to the accompanying drawings, the brake master cylinder with a novel cup pin structure in this embodiment includes a pump body 1 and an oil cup 2. The pump body 1 is provided with an oil inlet 10, and the oil cup 2 is provided with an oil nozzle 20. The oil nozzle 20 is inserted into the oil inlet 10. A leak-proof sealing component (such as a sealing ring or sealing seat) can also be provided between the oil nozzle 20 and the oil inlet 10.
[0029] The oil cup 2 is provided with a connecting through hole 21, and the pump body 1 is provided with a connecting pin hole 11. The oil cup 2 and the pump body 1 are connected by a cup pin 3, and the oil cup 2 and the pump body 1 are fixedly connected and assembled by the cup pin 3.
[0030] The cup pin 3 passes through the connecting through hole 21 and is pinned to the connecting pin hole 11. The oil cup 2 is provided with a front support leg 22 and a rear support leg 23, which can be located at the bottom of the oil cup 2. The connecting through hole 21 is respectively located on the front support leg 22 and the rear support leg 23. The connecting pin hole 11 is located between the front support leg 22 and the rear support leg 23. The connecting pin hole 11 and the connecting through hole 21 form a pin connection channel. The cup pin 3 is inserted into the pin connection channel to fix the oil cup 2 and the pump body 1 together.
[0031] The brake master cylinder with a novel cup pin structure includes a cup pin 3 connection structure, which fixes and assembles the oil cup 2 and the pump body 1 through the pin connection structure. Both the cup pin 3 and the connecting pin hole 11 are through holes, which are simple to process and have low manufacturing costs. The pin connection assembly is simple and convenient, avoiding various problems that occur when using fastening screws, screw holes, etc., reducing processing costs and simplifying the assembly structure.
[0032] Based on the above embodiments, the following optimizations or further explanations can be made.
[0033] The connecting pin hole 11 is aligned with the connecting through holes 21 on the front support leg 22 and the rear support leg 23 on the front and rear sides. When the cup pin 3 is engaged, the cup pin 3 passes through the connecting through hole 21, the connecting pin hole 11, and the connecting through hole 21 in sequence, and the cup pin 3 and the connecting pin hole 11 are engaged.
[0034] In addition, the cup pin 3 is made of plastic injection molding. The injection molding process is mature, and the material is readily available and relatively inexpensive.
[0035] The rear end of the cup pin 3 is a limiting protrusion 30 (such as a round head), and the front end of the cup pin 3 is an insertion anti-detachment part 31. Without installing any other additional parts, the cup pin 3 can assemble and connect the oil cup 2 and the pump body 1, and during normal use, the cup pin 3 is not easy to detach, and the structure is stable after assembly.
[0036] Further optimization involves providing a raised rib 32 on the pin rod between the front and rear ends of the cup pin 3 (i.e., the middle area of the cup pin 3). This raised rib 32 strengthens the cup pin 3, making it more secure. Additionally, the raised rib 32 helps to better lock the pin rod of the cup pin 3 into the connecting pin hole 11. It can even utilize the deformation caused by compression during pinning to achieve a tighter fit. The cup pin 3 can use the raised rib 32 to ensure an interference fit with the connecting pin hole 11, preventing axial movement of the cup pin 3 after pinning. In other words, the raised rib 32 is a reinforced pin-hole locking rib, serving to strengthen the cup pin 3 and ensure a tight fit in the pin hole.
[0037] The raised ribs 32 are arranged axially at both ends; the raised ribs 32 are evenly arranged circumferentially on the pin, so that when the cup pin 3 is engaged, the force is evenly balanced and the pin is firmly tightened. For example, two, three or four raised ribs 32 are provided.
[0038] For example, the insertion anti-detachment part 31 includes an elastic opening 311 and a contraction anti-detachment protrusion 312. The elastic opening 311 allows the front end of the cup pin 3 to elastically contract and recover. The contraction anti-detachment protrusion 312 can cause the elastic opening 311 of the cup pin 3 to contract and narrow, so that the cup pin 3 can smoothly pass through the connecting pin hole 11 and the connecting through hole 21. For example, when the cup pin 3 is inserted into the connecting pin hole 11 or the connecting through hole 21, the connecting pin hole 11 or the connecting through hole 21 is constrained to the outer periphery (i.e., the outer ring) of the narrowing anti-detachment protrusion 312, thereby causing the elastic opening 311 to contract and narrow, allowing the front end of the cup pin 3 to pass through smoothly until the front end of the cup pin 3 passes through and the constraint is released. The elastic opening 311 can then unfold and return to its original state, and the narrowing anti-detachment protrusion 312 can be limited to the outside (of the connecting through hole 21). Except for other external forces (such as manual disassembly), the cup pin 3 can be prevented from detaching or falling off. The design of the elastic opening 311 makes it difficult for the cup pin 3 to fall off after assembly, and the assembly is convenient. It only needs to be tapped in gently. Moreover, the oil cup 2 is not easy to fall off after assembly, and the stability is better. The elastic opening 311 is located at the front end of the cup pin 3 and faces forward. The elastic opening 311 is radially through, such as when the left and right sides of the elastic opening 311 are open to form a radial through structure. The constricted anti-detachment protrusion 312 is located on the outer side wall of the front end of the cup pin 3 and is arranged on both sides of the elastic opening 311. The constricted anti-detachment protrusion 312 (the anti-detachment protrusion body) is provided with a pull-out constriction guide side 3121 (such as an arc surface or a slope). When the cup pin 3 is actively inserted and removed, the pull-out constriction guide side 3121 can make the elastic opening 311 of the cup pin 3 retract smoothly and pass through the connecting pin hole 11 and the connecting through hole 21.
Claims
1. A brake master cylinder with a novel cup pin structure, comprising a pump body (1) and an oil cup (2), wherein the pump body (1) is provided with an oil inlet (10), and the oil cup (2) is provided with an oil nozzle (20), the oil nozzle (20) being inserted into the oil inlet (10), characterized in that: The oil cup (2) is also provided with a connecting through hole (21), and the pump body (1) is provided with a connecting pin hole (11). The oil cup (2) and the pump body (1) are connected by a cup pin (3). The cup pin (3) passes through the connecting through hole (21), and the cup pin (3) is engaged with the connecting pin hole (11). The oil cup (2) is provided with a front support (22) and a rear support (23), and the connecting through holes (21) are respectively provided on the front support (22) and the rear support (23). The connecting pin hole (11) is located between the front support leg (22) and the rear support leg (23), and the connecting pin hole (11) and the connecting through hole (21) form a pin connection channel; The rear end of the cup pin (3) is a limiting protrusion (30), and the front end of the cup pin (3) is an insertion anti-detachment part (31).
2. The brake master cylinder with a novel cup pin structure as described in claim 1, characterized in that: The connecting pin hole (11) is aligned with the connecting through hole (21) on the front support leg (22) and the rear support leg (23) on the front and rear sides.
3. The brake master cylinder with a novel cup pin structure as described in claim 1, characterized in that: The cup pin (3) is made of plastic injection molding.
4. The brake master cylinder with a novel cup pin structure as described in claim 1 or 3, characterized in that: The pin (3) has a raised rib (32) between the front and rear ends.
5. The brake master cylinder with a novel cup pin structure as described in claim 4, characterized in that: The ribs (32) are arranged axially at the front and rear; the ribs (32) are evenly arranged circumferentially on the pin.
6. The brake master cylinder with a novel cup pin structure as described in claim 5, characterized in that: Two, three, or four raised ribs (32) are provided.
7. The brake master cylinder with a novel cup pin structure as described in claim 4, characterized in that: The raised rib (32) is a rib with a reinforced body and a pin-locking type.
8. The brake master cylinder with a novel cup pin structure as described in claim 1, characterized in that: The insertion anti-detachment part (31) includes an elastic opening (311) and a constricted anti-detachment protrusion (312). The elastic opening (311) is located at the front end of the cup pin (3) and is set to open forward. The elastic opening (311) is set to penetrate radially. The constriction anti-detachment protrusion (312) is located on the outer side wall of the front end of the cup pin (3). The constriction anti-detachment protrusion (312) is arranged on both sides of the elastic opening (311).
9. The brake master cylinder with a novel cup pin structure as described in claim 8, characterized in that: The anti-detachment protrusion (312) has an insertion and removal guide side (3121) on its anti-detachment protrusion body.