brake chamber

Abstract

The utility model relates to brake rear air chamber, at least including the casing, still including setting in the casing integral type reciprocating mechanism, integral type piston mechanism includes piston cylinder and piston body, the piston body adopts nylon material injection moulding, piston cylinder and piston body integrated into one piece are made, the end part of piston cylinder and piston body contact is provided with the flanging that turns inwards, and the outer wall of piston cylinder is provided with screw thread in cooperation with piston body, improves the cooperation intensity.

Description

Technical Field

[0001] This utility model relates to the field of vehicle braking, and more particularly to the brake chamber of a pneumatic braking device. Background Technology

[0002] Air pressure braking combined with drum brakes can meet the high-frequency braking needs of commercial vehicles. Especially when the vehicle is heavily loaded, air pressure braking can provide extremely strong braking force. Moreover, the air tank of the air pressure braking device has a sufficient air supply, so even if there is a leak, the braking effect can still be ensured, making it suitable for long-distance use of commercial vehicles.

[0003] Air pressure braking uses an air pump to drive a push rod to control drum brakes. Taking a wedge brake as an example, which is a common form of drum brake, the air pump pushes the push rod towards the inside of the wedge brake, dislodging the brake shoes. The piston reciprocating mechanism drives the push rod. Existing air pressure braking systems in commercial vehicles have a front air chamber that controls the front wheel braking and a rear air chamber that controls the rear wheel braking. The rear wheels are also connected to the parking brake, making the rear air chamber structure more complex. The existing pistons in the rear chamber are basically made of aluminum alloy or stamped steel plates, which are heavy. It is well known that reducing the load on the braking device can greatly increase its service life and long-term performance. The existing pistons are not a single structure. They need to be fitted with nylon piston rings, piston cylinders, gaskets, and seals. The piston cylinder needs to be press-fitted into the piston bore. Gaskets need to be placed between the piston cylinder and the piston bore. There are also rubber seals between the piston cylinder and the piston for sealing. The product structure is complex. Moreover, aluminum alloy materials need to be die-cast into blanks and then machined. Steel plates need to be stamped, machined, and electroplated multiple times before being assembled with piston cylinders, piston rings, gaskets, and seals. The material cost is high. The cost of the processing technology, the cost of the materials themselves, and the complex structure determine the high cost of such products. Utility Model Content

[0004] To solve the above technical problems, a brake rear air chamber is provided. The provided technical solution includes at least a housing and an integrated reciprocating mechanism disposed within the housing. The integrated piston mechanism includes a piston cylinder and a piston body. The piston body is injection molded from nylon material, and the piston cylinder and piston body are integrally formed.

[0005] The piston cylinder has an inwardly turned flange at the end that contacts the piston body, and the piston cylinder has threads on the outer wall that mates with the piston body to improve the fit strength.

[0006] Based on the above technical solution, a device for drying air is installed outside the housing. The device for drying air is connected to the brake air inlet and is used to dry the external air.

[0007] Based on the above technical solution, the air drying equipment is an air dryer, which includes a shell, an air guide pipe, a desiccant, an air inlet, and an air outlet. The air guide pipe is located inside the shell and includes a metal shaping frame and a breathable mesh. The breathable mesh is formed into a tube, with the air inlet and air outlet connected to the two ends of the tube, respectively. The air outlet is connected to the brake air inlet. The metal shaping frame is arranged along the direction of the breathable mesh and provides support and shaping. The desiccant is placed between the shell and the breathable mesh. The desiccant can absorb moisture, and the diameter of the desiccant particles is larger than the pore size of the breathable mesh.

[0008] Based on the above technical solution, an outwardly protruding annular flange is provided on the outer wall of the piston body to replace the sealing ring. The annular flange is formed by injection molding.

[0009] Based on the above technical solution, the piston body and piston cylinder are waterproofed.

[0010] Based on the above technical solution, the waterproofing treatment is a material modification, and the piston body is injection molded using glass fiber reinforced nylon modified composite material.

[0011] Based on the above technical solution, the waterproofing treatment is a surface coating process.

[0012] Based on the above technical solution, the surface coating process is a surface nickel-plated waterproof layer.

[0013] Based on the above technical solution, the surface coating process is a hot-pressed composite fluorocarbon coating.

[0014] Beneficial effects: It has revolutionized the raw materials and production process of pistons, adopted high-strength and lightweight materials, and injection molded the piston body and piston cylinder in one piece, greatly reducing the number of parts and solving the problems of heavy weight, complex structure and high cost.

[0015] While actively adopting new materials, the company provides waterproofing measures to extend the service life of the piston body. These measures include external drying control and built-in waterproof coatings and material modification options. Consumers can choose the appropriate option according to their needs to better control daily use and maintenance costs. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view of the existing aluminum alloy piston mechanism.

[0017] Figure 2 This is a schematic cross-sectional view of a steel plate stamping piston mechanism in the prior art.

[0018] Figure 3 This is a schematic cross-sectional view of the piston cylinder of this utility model.

[0019] Figure 4 This is a structural cross-sectional schematic diagram of the combined state of the piston cylinder and piston body of this utility model.

[0020] Figure 5 For the present utility model Figure 4 A schematic diagram showing the installation status of the parking brake release screw and the parking brake release nut.

[0021] Figure 6 This is a front view schematic diagram of the present utility model.

[0022] Figure 7 This is a front sectional view of the present invention.

[0023] Figure 8 This is a cross-sectional schematic diagram of the dryer of this utility model in its installed state.

[0024] Figure 9 This is a cross-sectional schematic diagram of the dryer of this utility model.

[0025] Figure 10 This is an enlarged cross-sectional schematic diagram of the air guide pipe of this utility model. Detailed Implementation

[0026] Example 1.

[0027] This embodiment creatively changes the raw materials and production process of the piston, adopting high-strength, lightweight nylon material. The piston cylinder 2 is placed in the mold and injection molded together with the piston body 3 in one step. After injection molding, the piston body 3 is more tightly connected to the piston cylinder 2, which effectively solves the problems of heavy weight, complex structure and high cost.

[0028] The piston cylinder 2 can still be made of metal, such as aluminum alloy. The piston cylinder 2 also features a one-piece molding design. At the end of the piston cylinder 2 intended to connect to the piston body 3, it is bent inwards or folded to form a flange 4. Figure 3 and Figure 4 As shown, the flange 4 of the piston cylinder 2 replaces... Figure 1 and Figure 2 The gasket 5 between the piston cylinder 2 and the piston body 3 reduces the complexity of the process and the difficulty of assembly.

[0029] To address the issues of connection strength and stability during injection molding, an external thread or thread is provided on the side wall of the piston cylinder 2. This thread is located on the side wall where the piston cylinder 2 mates with the piston body 3. After injection molding, the piston body 3 can tightly engage with this thread, preventing separation and increasing connection strength and stability.

[0030] In this embodiment, in order to better reduce the number of parts, the mold of the piston body 3 is adjusted so that an annular flange 14 is formed on the outer wall of the piston body 3 during injection molding. Its outward protruding structure replaces the function of the sealing ring 18.

[0031] Example 2.

[0032] This embodiment is based on the first embodiment, in which the piston body 3 is made of nylon. However, during parking brake operation, external air enters the rear cavity of the housing 1 through the service brake air inlet 16. Furthermore, nylon has a certain water absorption characteristic, which may cause it to expand and deform after absorbing water, potentially affecting performance. To address this issue, a device for drying air is connected to the outside of the housing 1. This device can dry the air to a certain extent, reducing the expansion rate of the nylon material and increasing its lifespan.

[0033] The air drying equipment can be any feasible solution. For example, an additional drying device can be added to the existing condenser dryer of the air pressure brake system in commercial vehicles. Alternatively, a drying device can be installed only outside the parking brake air inlet 15 to filter moisture from the outside atmosphere. In other words, the drying device can be installed either in the service brake air inlet or the parking brake air inlet 15.

[0034] In this embodiment, the drying device is an air dryer 6, used for simple water vapor filtration. For example... Figures 8 to 10 As shown, the desiccant 9 is enclosed within the outer casing 7, and the air duct 8 forms a tubular channel within the outer casing 7, extending from the atmospheric inlet 11 to the outlet 12. To allow the desiccant 9 to absorb moisture in the air, the wall of the air duct is made of a breathable mesh fabric 10, allowing moisture to be absorbed by the desiccant 9 as air flows through the duct. To maintain the shape stability of the air duct 8 and prevent it from being flattened by the desiccant 9, a metal support frame 13 is provided along the direction of the breathable mesh fabric 10. The breathable mesh fabric 10 can be connected to the metal support frame 13 through various connection methods, and the metal support frame supports the breathable mesh fabric 10, maintaining its tubular shape.

[0035] In this embodiment, the metal frame 13 can be arranged in a curved shape as needed, so that the pipeline is also curved, which increases the contact area with air and reduces the length of the outer shell 7.

[0036] In this embodiment, the breathable mesh fabric 10 can be made of any feasible material, such as non-woven fabric or even cotton textile material. However, the mesh size of the breathable mesh fabric 10 is smaller than the size of the desiccant particles to prevent the desiccant from passing through the breathable mesh fabric 10.

[0037] The desiccant can also be any feasible material, including chemical and physical desiccants, such as activated carbon.

[0038] In this embodiment, multiple threaded covers 17 can be provided on the outer casing 7. After opening the threaded covers 17, the desiccant inside the outer casing 7 can be replaced.

[0039] Example 3.

[0040] This embodiment is implemented based on the technology of any of the embodiments. However, this embodiment and the second embodiment have the same inventive purpose, which is to solve the interference of water vapor in the air.

[0041] This embodiment directly waterproofs the piston body 3 and piston cylinder 2, improving wear resistance while simultaneously waterproofing. The treatment scheme in this embodiment can be divided into a material modification scheme and a surface treatment scheme. The material modification scheme involves replacing traditional nylon material with a glass fiber reinforced nylon modified composite material. This material modifies the structure of the piston body 3; the glass fiber in the piston body is coarser and visible to the naked eye, and the fiber mesh structure provides stronger support, greater wear resistance, higher temperature resistance, and lower water absorption.

[0042] The surface treatment solution is a surface coating process. A waterproof layer can be formed by surface nickel plating or by hot-pressing composite fluorocarbon coating. Surface nickel plating is more common because it is cheaper. Fluorocarbon coating is more expensive but more durable and is suitable for large-volume orders to reduce costs.

Claims

1. A brake chamber, comprising at least a housing, characterized in that, It also includes an integrated reciprocating mechanism housed within the housing. The integrated piston mechanism includes a piston cylinder and a piston body. The piston body is injection molded from nylon material, and the piston cylinder and piston body are integrally formed. The piston cylinder has an inwardly turned flange at the end that contacts the piston body, and the piston cylinder has threads on the outer wall that mates with the piston body to improve the fit strength.

2. The brake rear air chamber as described in claim 1, characterized in that, A device for drying air is installed outside the housing, and the device for drying air is connected to the brake air inlet to dry the outside air.

3. The brake rear air chamber as described in claim 1, characterized in that, The air dryer is a device for drying air. It includes a shell, an air duct, a desiccant, an air inlet, and an air outlet. The air duct is located inside the shell and includes a metal frame and a breathable mesh. The breathable mesh is formed into a tube, with the air inlet and outlet connected to the two ends of the tube, respectively. The outlet is connected to the air inlet. The metal frame is arranged along the direction of the breathable mesh and provides support and shaping. The desiccant is placed between the shell and the breathable mesh. The desiccant can absorb moisture, and the diameter of the desiccant particles is larger than the pore size of the breathable mesh.

4. The brake rear air chamber as described in claim 1, characterized in that, The piston body has an outwardly protruding annular flange on its outer wall to replace the sealing ring. The annular flange is formed by injection molding.

5. The brake rear air chamber as described in claim 1, characterized in that, The piston body and piston cylinder are waterproofed.

6. The brake rear air chamber as described in claim 5, characterized in that, The waterproofing treatment is a material modification process; the piston body is injection molded using glass fiber reinforced nylon modified composite material.

7. The brake rear air chamber as described in claim 5, characterized in that, The waterproofing treatment is a surface coating process.

8. The brake rear air chamber as described in claim 7, characterized in that, The surface coating process is a nickel-plated waterproof layer.

9. The brake rear air chamber as described in claim 7, characterized in that, The surface coating process is a hot-pressed composite fluorocarbon coating.

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