Hydraulic pump with leather cup on pump body

Abstract

The utility model relates to a hydraulic pump with a leather cup on a pump body, and belongs to the field of automobile brake systems. The plunger rod component is slidably connected with the valve body, the oil inlet steel ball spring assembly and the return spring are installed on the two sides of the spring seat respectively, the pump body is installed in the valve body and slidably connected with the plunger rod component, the leather cup is installed in the pump body, the rear cover is installed in the portion, on the upper portion of the pump body, of the valve body, and the oil outlet steel ball spring assembly is located between the rear cover and the upper portion of the pump body. The hydraulic pump has the advantages of being novel in structure, improving sealing performance and liquid pumping efficiency, being small in size, compact and simple in internal structure, low in cost and easy to manufacture and assemble, and being suitable for requirements of miniaturization and durability of automobiles.

Description

Technical Field

[0001] This utility model belongs to the field of automotive braking systems, and in particular relates to a hydraulic pump with a pump body and a piston 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 a core component of the anti-lock braking system (ABS), the hydraulic pump pumps a portion of the brake fluid from the wheel cylinders back to the master cylinder when one or more wheels lock up during braking. This releases pressure from the brakes of the locked wheels until the tires are rolling on the ground, further ensuring vehicle stability. Currently used hydraulic pumps generally suffer from complex internal structures, large size, poor sealing, and insufficient pumping efficiency, making them unsuitable for the miniaturization and durability requirements of automobiles. Summary of the Invention

[0004] This utility model provides a hydraulic pump with a pump body and a piston cup to solve the problems of current pumps having complex structures, large size, poor sealing, and insufficient pumping efficiency, which are not suitable for the miniaturization and durability requirements of automobiles.

[0005] The technical solution adopted by this utility model is as follows: it includes a valve body, a plunger rod assembly, an inlet steel ball spring assembly, a cup, a spring seat, a return spring, a pump body, an outlet steel ball spring assembly, and a rear cover. The plunger rod assembly is slidably connected to the valve body. The inlet steel ball spring assembly and the return spring are respectively installed on both sides of the spring seat. The pump body is installed inside the valve body and is slidably connected to the plunger rod assembly. The cup is installed in the rectangular cup assembly annular groove of the pump body. The rear cover is installed inside the valve body at the upper part of the pump body. The outlet steel ball spring assembly is located between the rear cover and the upper part of the pump body.

[0006] The valve body includes an oil inlet and an oil outlet.

[0007] The plunger rod assembly includes a plunger rod, a guide ring, a retaining ring, a star-shaped ring, a filter screen, a plunger rod inlet, an inlet ball seat, and a spring seat mounting ring. The outer diameter of the plunger rod is fitted with the valve body, guide ring, retaining ring, and filter screen with a small clearance. The guide ring provides a limiting and guiding function for the plunger rod and is interference-fitted with the star-shaped ring and the piston cup. An inlet ball is placed inside the inlet ball seat, and a spring seat is placed inside the spring seat mounting ring.

[0008] The star-shaped ring provides a two-way seal.

[0009] The oil inlet steel ball spring assembly includes an oil inlet steel ball and an oil inlet spring.

[0010] The piston cup has an E-type structure and provides a one-way seal. It has multiple oil inlets along its circumference. During the outward operation, when the pump body cavity is pressurized, the inner and outer lips of the E-type piston cup expand, providing a reliable seal. During the return operation, when the pump body is filled with fluid, in addition to the brake fluid entering the pump body cavity from around the steel ball at the oil inlet, the inner and outer lips of the E-type piston cup contract, and the brake fluid is simultaneously drawn into the pump body cavity from the radial gap between the plunger rod and the pump body, thereby improving pumping efficiency.

[0011] The material of the leather cup is EPDM.

[0012] One end of the spring seat is recessed inward to limit the oil inlet spring, and the other end is fitted inside the spring seat mounting ring of the plunger rod with a planar fit. It is pressed by a return spring and has multiple oil inlet holes along the circumference.

[0013] The pump body includes a main body, an inner cavity of the pump body, and a rectangular cup assembly annular groove.

[0014] The oil outlet steel ball spring assembly includes an oil outlet steel ball and an oil outlet spring.

[0015] The advantages of this utility model are its novel structure. By adopting a one-way sealing E-type cup and a two-way sealing star-shaped ring, the sealing performance is improved. Furthermore, the E-type cup is assembled in the rectangular annular groove of the pump body. 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 cup expand, providing a reliable sealing effect; on the return stroke, when the pump body is filled with fluid, in addition to the brake fluid entering the pump body cavity through the conventional oil inlet steel ball, the inner and outer lips of the E-type cup contract, and the brake fluid is also quickly drawn into the pump body cavity from the mating point between the E-type cup lip and the plunger rod, thereby improving pumping efficiency. The hydraulic pump is small in size, with a compact and simple internal structure, low cost, and easy manufacturing and assembly processes, making it suitable for the miniaturization and durability requirements of automobiles. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a structural schematic diagram of the plunger rod component of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the spring seat of this utility model;

[0019] Figure 4 This is a schematic diagram of the pump body of this utility model. Detailed Implementation

[0020] See Figure 1The system includes a valve body 1, a plunger rod assembly 2, an inlet ball spring assembly 3, a cup 4, a spring seat 5, a return spring 6, a pump body 7, an outlet ball spring assembly 8, and a rear cover 9. The plunger rod assembly 2 is slidably connected to the valve body 1. The inlet ball spring assembly 3 and the return spring 6 are respectively installed on both sides of the spring seat 5. The pump body 7 is installed inside the valve body 1 and is slidably connected to the plunger rod assembly 2. The cup 4 is installed in the rectangular cup assembly annular groove 703 of the pump body 7. The rear cover 9 is installed inside the valve body 1 on the upper part of the pump body 7. The outlet ball spring assembly 8 is located between the rear cover 9 and the upper part of the pump body 7.

[0021] The valve body 1 includes an oil inlet 101 and an oil outlet 102.

[0022] See Figure 2 The plunger rod component 2 includes a plunger rod 201, a guide ring 202, a retaining ring 203, a star ring 204, a filter screen 205, a plunger rod oil inlet 206, an oil inlet steel ball seat 207, and a spring seat mounting ring 208. The outer diameter of the plunger rod 201 is in close clearance fit with the valve body 1, the guide ring 202, the retaining ring 203, and the filter screen 205. The guide ring 202 limits and guides the plunger rod 201, restricting the lateral force generated when the eccentric shaft of the motor rotor pushes the plunger rod to move, which causes the plunger rod to rub against the valve body. It is also in interference fit with the star ring 204 and the cup 4. An oil inlet steel ball 301 is placed in the oil inlet steel ball seat 207, and a spring seat 5 is placed in the spring seat mounting ring 208.

[0023] The star-shaped ring 204 serves a bidirectional sealing function.

[0024] The oil inlet steel ball spring assembly 3 includes an oil inlet steel ball 301 and an oil inlet spring 302.

[0025] The piston cup 4 has an E-type structure, which serves as a one-way seal. It has multiple oil inlets along its circumference to ensure sufficient fluid intake. During the outward operation, when the pump body 7 builds up pressure, the inner and outer lips of the E-type piston cup expand, providing a reliable seal. During the return operation, when the pump body 7 is filled with fluid, in addition to the brake fluid entering the pump body cavity 702 from the periphery of the inlet steel ball 301, the inner and outer lips of the E-type piston cup contract, and the brake fluid is simultaneously drawn into the pump body cavity 702 from the radial gap between the plunger rod 201 and the pump body 7, thereby improving pumping efficiency.

[0026] The material of the leather cup 4 is EPDM.

[0027] See Figure 3One end 501 of the spring seat 5 is recessed inward to limit the oil inlet spring 302, preventing the oil inlet spring from deflecting and rubbing against the mating parts; the other end 502 is assembled in the spring seat mounting ring 208 of the plunger rod 2, with a planar fit, and is pressed by the return spring 6. There are multiple oil inlet holes 503 around the circumference to ensure that the brake fluid flowing in through the oil inlet can quickly and fully enter the pump body cavity.

[0028] See Figure 4 The pump body 7 includes a main body 701, an inner cavity 702, and a rectangular cup assembly annular groove 703.

[0029] The oil outlet steel ball spring assembly 8 includes an oil outlet steel ball 801 and an oil outlet spring 802.

[0030] Working principle:

[0031] The valve body 1, plunger rod 201, star ring 204, pump body 7, piston cup 4, and inlet steel ball 301 form the inlet chamber; the inlet steel ball 301, plunger rod 201, piston cup 4, pump body 7, and outlet steel ball 801 form the pump body cavity. One end is sealed by the inlet spring 302 positioned by the spring seat 5, which presses the inlet steel ball 301 to cooperate with the conical surface of the inlet steel ball seat 207 of the plunger rod 201; the other end is sealed by the outlet steel ball 801 positioned by the rear cover 9, which presses the outlet spring 802 to cooperate with the conical surface of the pump body 7; the outlet steel ball 801, rear cover 9, and valve body 1 form the outlet chamber.

[0032] During operation, the oil inlet 101 of valve body 1 is connected to the brake wheel cylinder end. When the ABS is working, the brake fluid at the brake wheel cylinder end passes through the oil inlet 101 under braking pressure, pushing open the oil inlet ball 301 and entering the pump body cavity 702. As the ABS motor camshaft rotates (from low point to high point), it pushes the plunger rod 201 to perform a forward stroke. At this time, the brake fluid in the pump body cavity 702 is compressed, closing the oil inlet ball 301 and opening the oil outlet ball 801, allowing the fluid to flow through the inlet. The outlet 102 pumps the brake fluid back into the master cylinder (at this time, the foot pedal vibrates); then the ABS motor camshaft continues to rotate (from the high point to the low point), and the plunger rod 201 returns under the action of the return spring 6. At this time, brake fluid from the brake wheel cylinder end passes through the inlet 101 under braking pressure, pushes open the inlet ball 301, and enters the pump body cavity 702; as above, the reciprocating motion realizes the pumping of brake fluid from the inlet 101 end back to the outlet 102 end.

Claims

1. A hydraulic pump with a pump body featuring a piston cup, characterized in that: The device includes a valve body, a plunger rod assembly, an inlet ball spring assembly, a cup, a spring seat, a return spring, a pump body, an outlet ball spring assembly, and a rear cover. The plunger rod assembly is slidably connected to the valve body. The inlet ball spring assembly and the return spring are respectively installed on both sides of the spring seat. The pump body is installed inside the valve body and is slidably connected to the plunger rod assembly. The cup is installed in the rectangular cup assembly annular groove of the pump body. The rear cover is installed inside the valve body at the top of the pump body. The outlet ball spring assembly is located between the rear cover and the top of the pump body.

2. A hydraulic pump with a piston cup in the pump body according to claim 1, characterized in that: The valve body includes an oil inlet and an oil outlet.

3. A hydraulic pump with a piston cup in the pump body according to claim 1, characterized in that: The plunger rod assembly includes a plunger rod, a guide ring, a retaining ring, a star-shaped ring, a filter screen, a plunger rod inlet, an inlet ball seat, and a spring seat mounting ring. The outer diameter of the plunger rod is fitted with the valve body, guide ring, retaining ring, and filter screen with a small clearance. The guide ring provides a limiting and guiding function for the plunger rod and is interference-fitted with the star-shaped ring and the piston cup. An inlet ball is placed inside the inlet ball seat, and a spring seat is placed inside the spring seat mounting ring.

4. A hydraulic pump with a piston cup in the pump body according to claim 3, characterized in that: The star-shaped ring provides a two-way seal.

5. A hydraulic pump with a piston cup in the pump body according to claim 1, characterized in that: The oil inlet steel ball spring assembly includes an oil inlet steel ball and an oil inlet spring.

6. A hydraulic pump with a piston cup in the pump body according to claim 1, characterized in that: The piston cup has an E-type structure and provides a one-way seal. It has multiple oil inlets along its circumference. During the outward operation, when the pump body cavity is pressurized, the inner and outer lips of the E-type piston cup expand, providing a reliable seal. During the return operation, when the pump body is filled with fluid, in addition to the brake fluid entering the pump body cavity from around the steel ball at the oil inlet, the inner and outer lips of the E-type piston cup contract, and the brake fluid is simultaneously drawn into the pump body cavity from the radial gap between the plunger rod and the pump body, thereby improving pumping efficiency.

7. A hydraulic pump with a piston cup in the pump body according to claim 6, characterized in that: The material of the leather cup is EPDM.

8. A hydraulic pump with a piston cup in the pump body according to claim 1, characterized in that: One end of the spring seat is recessed inward to limit the oil inlet spring, and the other end is fitted inside the spring seat mounting ring of the plunger rod with a planar fit. It is pressed by a return spring and has multiple oil inlet holes along the circumference.

9. A hydraulic pump with a piston cup in the pump body according to claim 1, characterized in that: The pump body includes a main body, an inner cavity of the pump body, and a rectangular cup assembly annular groove.

10. A hydraulic pump with a piston cup in the pump body according to claim 1, characterized in that: The oil outlet steel ball spring assembly includes an oil outlet steel ball and an oil outlet spring.

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