A hydraulic booster with a brake master cylinder assembly
By improving the structural design of the hydraulic booster with brake master cylinder assembly, the thickened retaining ring is used to cooperate with the inner hole of the power piston, the spring seat is cancelled, the variable diameter return spring and the forged blank pump cover are used, the space layout and displacement requirements of large-tonnage models are solved, and the effect of compactness, lightweightness and cost reduction is achieved.
Patent Information
- Application Number
- CN201911209840.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2019-12-02
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2039-12-02
AI Technical Summary
The existing hydraulic booster with brake master cylinder assembly is difficult to arrange space on large tonnage models, and it is difficult to meet the displacement requirements of large-sized hydraulic brakes, limiting their use range.
A hydraulic booster with brake master cylinder assembly is designed, and the thickened retaining ring is used to cooperate with the inner hole of the power piston to assist the piston and the output push rod without relative movement. The spring seat is cancelled, a variable diameter return spring is used, and a pump body pump cover is used forged blanks and QPQ treatment is used to optimize the structure to reduce axial size and weight.
It has achieved compact layout on large-tonnage models, reducing manufacturing costs, improving processing efficiency, enhancing corrosion resistance and extending service life, while meeting the brake displacement needs of larger-tonnage models.
Smart Images
Figure CN112977377B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a booster with a brake master cylinder assembly, in particular to a hydraulic booster with a brake master cylinder assembly. Background Art
[0002] Hydraulic power-assisted braking is mainly used on vehicles weighing more than 3.5 tons to address issues such as insufficient braking force from vacuum-assisted braking, rough air brakes with poor controllability, complex layout, and high costs. Currently, domestic hydraulic power-assisted braking is mainly used on long-nose vehicles, which can meet the handling performance requirements of different customers, as well as meet space layout requirements and reduce costs. However, with the development of the new energy market, the demand for lightweight and compact vehicles is becoming increasingly stringent, especially for flat-nose vehicles. The existing hydraulic booster with brake master cylinder assembly can no longer meet the space layout requirements in terms of axial dimensions, making it difficult to arrange it in the cab. At the same time, domestic OEMs are also gradually developing large-tonnage hydraulic brake vehicles. The existing hydraulic booster with brake master cylinder cannot meet the displacement requirements of large-size hydraulic brakes, which limits the use of hydraulic booster with brake master cylinder. Summary of the Invention
[0003] The purpose of the present invention is to provide a hydraulic booster with a brake master cylinder assembly, which has a compact structure and is light in weight and can be used on large-tonnage hydraulic brake vehicle models.
[0004] To solve the above technical problems, the present invention provides the following technical solutions: A hydraulic booster with a brake master cylinder assembly includes a brake master cylinder, characterized in that it also includes a hydraulic booster, the hydraulic booster comprising a pump body with an oil passage, the pump body being connected to a pump cover with a groove and a seal by bolts to form a boosting chamber; the pump body being provided with an oil inlet and two oil outlets, the oil inlet and the oil outlets being connected to a slide valve hole in the pump body; an accumulator being mounted on the pump body, the accumulator oil passage being connected to a plunger hole, the oil inlet of the pump body being connected to the plunger hole through the slide valve hole; a booster piston being mounted within the pump body; an output push rod being mounted within a hole at one end of the booster piston, the output push rod having an annular groove at one end, and a retaining ring being mounted on the annular groove; a hole at the end of the booster piston being a three-stepped hole, the first step hole being a limiter for the output push rod, the second step hole being a limiter for the output push rod retaining ring and a guide for the output push rod, and the third step hole being a spring seat for limiting the return spring of the booster piston.
[0005] Improvement on the above technical solution: the retaining ring is a thickened retaining ring and has an interference fit with the inner hole of the power-boosting piston.
[0006] Further improvement of the above technical solution: The boosting piston returns by means of a return spring at its end; the return spring is a variable-diameter spring with one end large and the other end small. The small-head end is limited by the boosting piston hole, and the large-head end is limited by a retaining ring on the booster pump body; the piston of the master cylinder passes through the return spring and extends into the booster to contact the output push rod, and the master cylinder pump body is connected to the booster pump body by bolts.
[0007] Further improvement of the above technical solution: The pump cover of the booster pump body is made of a forging blank, and after the processing of the pump cover of the booster pump body is completed, QPQ treatment is adopted.
[0008] Beneficial effects:
[0009] When using the hydraulic booster with master cylinder assembly of the present invention, the oil inlet of the booster pump body passes through the spool hole and communicates with the plunger hole, and the plunger hole is directly connected to the accumulator oil passage, eliminating the processing of process holes and the use of process plugs, improving the processing efficiency and reducing the manufacturing cost; an interference fit is adopted between the thickened retaining ring and the boosting piston with a stepped hole in the inner hole. There is no relative movement between the boosting piston and the output push rod, and the output push rod will not fall off during the movement process, and at the same time, it can guide the output push rod; the step in the boosting piston hole serves as a spring seat to limit the return spring, eliminating the use of a spring seat, improving the assembly efficiency, reducing the manufacturing cost, and at the same time saving the installation space of the return spring of the boosting piston; a variable-diameter spring with one end large and the other end small, the large head can be limited by the retaining ring installed on the pump body, reducing the use of the spring seat, increasing the utilization rate of the inner hole space of the spring, allowing the master cylinder piston with a larger cylinder diameter to pass through, and meeting the displacement requirements for braking of vehicles with a larger tonnage; reducing the axial dimension of the assembly and also reducing the weight of the assembly. For the booster pump body and pump cover of the present invention, non-quenched and tempered steel forging blanks are used, increasing the material strength, which is beneficial to the optimization of the structure, further reducing the overall length and reducing the weight of the assembly; the surface of the pump body pump cover is treated with QPQ, which can improve the corrosion resistance, at the same time increase the service life of the assembly, and reduce environmental pollution. Description of the drawings
[0010] Figure 1 is the structural schematic diagram of the present invention;
[0011] Figure 2 is the oil passage structural view of the present invention;
[0012] Figure 3 is the structural schematic diagram of the preferred solution of the present invention;
[0013] Figure 4 is the oil passage preferred solution structural schematic diagram of the present invention;
[0014] Wherein: A, hydraulic booster; B, master cylinder; 1, pump body; 2, bolt; 3, pump cover; 3.1, groove; 3.2, seal; 4, accumulator; 4.1, accumulator oil passage; 5, boost piston; 6, output push rod; 6.1, annular groove; 7, retaining ring; 8, spring seat; 9, return spring; 10, spring seat; 11, retaining ring; 12, bolt; 01, piston; 02, master cylinder pump body. Specific embodiments
[0015] As Figure 1 , Figure 2 shown, a hydraulic booster with a master cylinder assembly includes a hydraulic booster A and a master cylinder B. The hydraulic booster A includes a pump body 1 provided with an oil passage. The pump body 1 is connected to a pump cover 3 provided with a groove 3.1 and a seal 3.2 by bolts 2 to form a boost chamber. The pump body 1 is provided with an inlet 1.1 and two outlets (1.2, 1.3). The inlet 1.1 and the outlets (1.2, 1.3) are communicated with a spool hole 1.4 in the pump body 1. An accumulator 4 is installed on the pump body 1. The accumulator oil passage 4.1 is communicated with a plunger hole 1.5 of the pump body 1. The inlet 1.1 of the pump body 1 passes through the spool hole 1.4 and is communicated with the plunger hole 1.5. A boost piston 5 is arranged in the pump body 1. An output push rod 6 is installed in a hole 5.1 at one end of the boost piston 5. An annular groove 6.1 is provided at one end of the output push rod 6. A retaining ring 7 is installed on the annular groove. The retaining ring 7 is a thickened retaining ring and is in interference fit with the inner hole 5.2 of the boost piston. The boost piston 5 is returned by a return spring 9 at the end. The return spring 9 is a variable-diameter spring with one end large and one end small. The small head 9.1 is limited by a boost piston hole 5.3, and the large head 9.2 is limited by a retaining ring 11 on the booster pump body 1. The piston of the master cylinder B passes through the return spring 9 and extends into the booster A to contact the output push rod 6. The master cylinder pump body 02 is connected to the booster pump body 1 by bolts 12.
Claims
1. A hydraulic booster with a brake master cylinder assembly, including a brake master cylinder, characterized in that: and a tube connecting the dischar e side of the pump with a plug in the forward end of the crank case, said tube having a check valve in it at the pump end, and said former tube which connects the pump to the oil drain plug, said tube having a check valve in it at the pump end, and said former tube which connects the pump to the oil drain plug, and said former tube which connects the pump to the oil drain plug, and said former The booster piston is returned to its original position by a return spring at its end; the return spring is a variable diameter spring with one end larger than the other, with the smaller end limited by the booster piston hole and the larger end limited by a retaining ring on the hydraulic booster pump body; the piston of the brake master cylinder passes through the return spring and extends into the hydraulic booster to contact the output push rod, and the brake master cylinder pump body is connected to the hydraulic booster pump body by bolts; The retaining ring is a thickened retaining ring, and has an interference fit with the inner hole of the booster piston; The hydraulic booster pump body and pump cover are made of forged blanks, and are QPQ treated after being processed.