Hydraulic pump structure with plunger rod provided with leather cup

Abstract

The utility model relates to a hydraulic pump structure with a plunger rod provided with a leather cup, and belongs to the field of automobile braking systems. The upper portion of the plunger rod assembly and the lower portion of the pump body are sealed through leather cups and installed in the valve body, the lower portion of a spring seat of the return spring assembly presses an oil inlet steel ball on the conical surface of the top of the plunger rod through an oil inlet spring, the rear cover is installed in the upper portion of the valve body, and an oil outlet steel ball is pressed on the conical surface of the top of the pump body through an oil outlet spring. The plunger has the advantages that the structure is novel, and the E-shaped leather cup is assembled through the rectangular annular groove of the plunger rod, so that the sealing performance is better during outbound pressure building; in the return stroke, brake fluid enters the inner cavity of the pump body from the oil inlet steel ball and can also be quickly sucked into the inner cavity of the pump body from the matching position of the E-shaped leather cup lip edge and the inner wall of the pump body, so that the fluid pumping efficiency is improved, the size of the formed hydraulic pump does not need to be enlarged, the internal structure is compact, the cost is low, and the manufacturing and assembling process is easy to achieve; the durability requirements of automobiles are met.

Description

Technical Field

[0001] This utility model belongs to the field of automotive braking systems, and particularly relates to a hydraulic pump structure with a plunger rod and a cup. Background Technology

[0002] Anti-lock braking system (ABS) is widely used in automotive safety. Its function is to automatically control the braking force of each wheel's brakes based on input electrical signals from wheel speed sensors and other sensors during braking, ensuring that the wheels maintain maximum traction on the road surface without locking up under certain road conditions.

[0003] As the core component of the anti-lock braking system, the hydraulic pump pumps some of the brake fluid in the wheel cylinder back to the master cylinder when one or more wheels lock up during vehicle braking. This releases pressure on the brakes of the locked wheels until the tires are rolling on the ground, thereby further ensuring the stability of the vehicle.

[0004] See Figure 4 Currently, the conventionally used plastic plunger seat A is radially fitted with the inner bore of the pump body. In order to achieve better sealing between the two, the plastic plunger seat A needs to be made longer, which results in a larger hydraulic pump size. During the return stroke, the brake fluid only enters the pump body cavity through the inlet steel ball. The pump fluid channel is singular and not suitable for the durability requirements of automobiles. Summary of the Invention

[0005] This utility model provides a hydraulic pump structure with a plunger rod and a cup to solve the problems of large hydraulic pump size and the need to improve return braking efficiency.

[0006] The technical solution adopted by this utility model is as follows: it includes a valve body, a plunger rod assembly, an oil outlet steel ball, an oil outlet spring, a rear cover, a pump body, an oil inlet steel ball, an oil inlet spring, a diaphragm, and a return spring assembly. The upper part of the plunger rod assembly and the lower part of the pump body are sealed by a diaphragm and installed in the valve body. The oil inlet spring presses the oil inlet steel ball against the top conical surface of the plunger rod below the spring seat of the return spring assembly. The rear cover is installed inside the upper part of the valve body, and the oil outlet spring presses the oil outlet steel ball against the top conical surface of the pump body.

[0007] The valve body, plunger rod assembly, pump body, piston cup, and inlet steel ball together form the oil inlet chamber.

[0008] The pump body cavity is composed of the inlet steel ball, plunger rod assembly, piston cup, pump body, and outlet steel ball.

[0009] The oil outlet steel ball, the rear cover, and the valve body form the oil outlet chamber.

[0010] The valve body has an oil inlet at the bottom and an oil outlet at the top.

[0011] The plunger rod assembly includes a plunger rod, two oil inlets, a guide ring, a retaining ring, a star ring, and a filter screen. The outer diameter of the plunger rod is in close clearance fit with the valve body, guide ring, retaining ring, filter screen, and pump body, and is in interference fit with the star ring and piston cup. There are multiple two oil inlets along the circumference.

[0012] The plunger rod has a rectangular annular groove inside for assembling the leather cup.

[0013] The leather bowl has an E-shaped structure.

[0014] The material of the leather cup is EPDM rubber.

[0015] The return spring assembly includes a spring seat and a return spring. One end of the spring seat is recessed inward, and the other end is fitted into the ring of the plunger rod in a planar fit. It is pressed by the return spring, and the spring seat has multiple circular holes along its circumference.

[0016] The advantages of this invention are its novel structure. An E-type piston cup is fitted into the rectangular annular groove of the plunger rod, providing better sealing than the conventionally used plastic plunger seat with radial fit to the pump body's inner bore. This results in better sealing during the outward pressure build-up phase. During the return phase, brake fluid enters the pump body cavity not only through the inlet steel ball but also rapidly draws in through the fit between the lip of the E-type piston cup and the pump body wall, thus improving pump efficiency. Furthermore, the resulting hydraulic pump does not require a larger volume, has a compact internal structure, low cost, and is easier to manufacture and assemble, making it suitable for the durability requirements of automobiles. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the plunger rod of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the E-type leather bowl of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of a conventional plunger pump. Detailed Implementation

[0021] The system includes a valve body 1, a plunger rod assembly 2, an oil outlet steel ball 3, an oil outlet spring 4, a rear cover 5, a pump body 6, an oil inlet steel ball 7, an oil inlet spring 8, a piston cup 9, and a return spring assembly 10. The upper part of the plunger rod assembly 2 and the lower part of the pump body 6 are sealed by the piston cup 9 and installed in the valve body 1. The spring seat 10.1 of the return spring assembly 10 presses the oil inlet steel ball 7 against the top conical surface of the plunger rod 2.1 through the oil inlet spring 8 to achieve a seal. The rear cover 5 is installed inside the upper part of the valve body 1 and presses the oil outlet steel ball 3 against the top conical surface of the pump body 6 through the oil outlet spring 4 to achieve a seal.

[0022] The valve body 1, plunger rod assembly 2, pump body 6, piston cup 9, and inlet steel ball 7 form the oil inlet chamber.

[0023] The inlet steel ball 7, plunger rod assembly 2, piston cup 9, pump body 6, and outlet steel ball 3 form the pump body cavity.

[0024] The oil outlet steel ball 3, the rear cover 5, and the valve body 1 form the oil outlet chamber.

[0025] The valve body 1 has an oil inlet 1.1 at the bottom and an oil outlet 1.2 at the top.

[0026] The plunger rod assembly 2 includes a plunger rod 2.1, an oil inlet 2.2, a guide ring 2.3, a retaining ring 2.4, a star ring 2.5, and a filter screen 2.6. The outer diameter of the plunger rod 2.1 is in a small clearance fit with the valve body 1, the guide ring 2.3, the retaining ring 2.4, the filter screen 2.6, and the pump body 6, and is in an interference fit with the star ring 2.5 and the piston cup 9. There are multiple oil inlets 2.2 along the circumference.

[0027] The plunger rod 2.1 has a rectangular annular groove 2.1.1 inside for assembling the leather cup 9.

[0028] The structure of the leather cup 9 is an E-type leather cup.

[0029] The material of the leather cup 9 is EPDM rubber.

[0030] The return spring assembly 10 includes a spring seat 10.1 and a return spring 10.2. One end of the spring seat 10.1 is recessed inward, and the other end is fitted into the ring of the plunger rod 2.1 in a planar fit and is pressed by the return spring 10.2. The spring seat 10.1 has multiple circular holes along its circumference.

[0031] Working principle

[0032] When the hydraulic pump is working: On the outward stroke, when the pump body cavity is pressurized, the inner and outer lips of the E-type piston cup 9 expand to provide a reliable seal; on the return stroke, when the pump body cavity is filled with fluid, in addition to the brake fluid entering the pump body cavity through the conventional oil inlet steel ball 7, the inner and outer lips of the E-type piston cup 9 contract, and the brake fluid is simultaneously drawn into the pump body cavity through the radial gap between the plunger rod 2.1 and the pump body 6, thereby improving the pumping efficiency.

Claims

1. A hydraulic pump structure with a plunger rod and a piston cup, characterized in that: The system includes a valve body, a plunger rod assembly, an outlet steel ball, an outlet spring, a rear cover, a pump body, an inlet steel ball, an inlet spring, a piston cup, and a return spring assembly. The upper part of the plunger rod assembly and the lower part of the pump body are sealed by a piston cup and installed in the valve body. The inlet spring presses the inlet steel ball against the top conical surface of the plunger rod below the spring seat of the return spring assembly. The rear cover is installed inside the upper part of the valve body and presses the outlet steel ball against the top conical surface of the pump body by the outlet spring.

2. The hydraulic pump structure with plunger rod and cup according to claim 1, characterized in that: The valve body, plunger rod assembly, pump body, piston cup, and inlet steel ball together form the oil inlet chamber.

3. The hydraulic pump structure with plunger rod and cup according to claim 1, characterized in that: The pump body cavity is composed of the inlet steel ball, plunger rod assembly, piston cup, pump body, and outlet steel ball.

4. The hydraulic pump structure with plunger rod and cup according to claim 1, characterized in that: The oil outlet steel ball, the rear cover, and the valve body form the oil outlet chamber.

5. The hydraulic pump structure with plunger rod and cup according to claim 1, characterized in that: The valve body has an oil inlet at the bottom and an oil outlet at the top.

6. The hydraulic pump structure with plunger rod and cup according to claim 1, characterized in that: The plunger rod assembly includes a plunger rod, two oil inlets, a guide ring, a retaining ring, a star ring, and a filter screen. The outer diameter of the plunger rod is in close clearance fit with the valve body, guide ring, retaining ring, filter screen, and pump body, and is in interference fit with the star ring and piston cup. There are multiple two oil inlets along the circumference.

7. The hydraulic pump structure with plunger rod and cup according to claim 6, characterized in that: The plunger rod has a rectangular annular groove inside for assembling the leather cup.

8. The hydraulic pump structure with plunger rod and cup according to claim 1, characterized in that: The leather bowl has an E-shaped structure.

9. A hydraulic pump structure with a plunger rod and a cup according to claim 8, characterized in that: The material of the leather cup is EPDM rubber.

10. The hydraulic pump structure with plunger rod and cup according to claim 1, characterized in that: The return spring assembly includes a spring seat and a return spring. One end of the spring seat is recessed inward, and the other end is fitted into the ring of the plunger rod in a planar fit. It is pressed by the return spring, and the spring seat has multiple circular holes along its circumference.

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