Hydraulic pump of brake handle

Abstract

The utility model relates to a hydraulic pump of a brake handle, which comprises a pump body and a piston arranged in the pump body, the pump body is provided with a liquid inlet hole and a liquid outlet hole, the piston is provided with a piston rod extending out of the pump body, the piston comprises a piston main body, one end of the upper portion of the piston main body is connected with the piston rod, and a reset spring is arranged between one end of the lower portion of the piston main body and the inner bottom of the pump body. The piston body is provided with a floating piston step, at least one backflow hole is axially formed in the floating piston step in a penetrating mode, and the portion, below the floating piston step, of the piston body is sleeved with a shielding plate. The shielding plate can abut against the lower portion of the floating piston step and shield all the backflow holes when the piston body is static, or the shielding plate is separated from the lower portion of the floating piston step and leaks out of the backflow holes when the piston body rapidly moves upwards. The shielding plate reset elastic piece drives the shielding plate to abut against the lower portion of the floating piston step when the piston body is static, backflow holes are added, and the backflow efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of brake handles, and particularly relates to a hydraulic pump for a brake handle. Background Art

[0002] The existing motorcycle brake master cylinder includes a pump body and a piston arranged in the pump body. The piston is provided with a piston rod extending outside the pump body. During braking, the piston squeezes the brake fluid into the brake caliper. When braking stops, the brake fluid flows back through the gap between the outer circle of the piston and the inner wall of the pump body, and the backflow efficiency is low. Summary of the Invention

[0003] The technical problem to be solved by the utility model is directed at the deficiencies of the above-mentioned prior art.

[0004] A hydraulic pump for a brake handle is provided, with a return hole added to improve the return efficiency.

[0005] To achieve the above object, the utility model provides the following technical solution: A hydraulic pump for a brake handle includes a pump body and a piston arranged in the pump body. The pump body is provided with a liquid inlet hole and a liquid outlet hole. The piston is provided with a piston rod extending outside the pump body. The piston includes a piston main body. One end of the upper part of the piston main body is connected to the piston rod, and a return spring is arranged between the other end of the lower part of the piston main body and the bottom inside the pump body. The feature is that: the piston main body is provided with a floating piston step, and at least one return hole is axially penetrated through the floating piston step. A shielding plate is sleeved below the floating piston step of the piston main body. The shielding plate can abut against the lower part of the floating piston step and block each return hole when the piston main body is stationary, or separate from the lower part of the floating piston step and expose the return holes when the piston main body moves rapidly upward. A shielding plate return elastic member is arranged below the shielding plate of the piston main body, and the shielding plate return elastic member drives the shielding plate to abut against the lower part of the floating piston step when the piston main body is stationary.

[0006] A further setting of the utility model is that: a limiting step is arranged below the shielding plate return elastic member of the piston main body.

[0007] A further setting of the utility model is that: a piston rod connection hole adapted to the piston rod is arranged at one end of the upper part of the piston main body.

[0008] A further setting of the utility model is that: the shielding plate return elastic member is an elastic washer.

[0009] The utility model with the above characteristics: when the piston body is stationary or moving downward, the shutter abuts against and blocks the return hole at one end below the floating piston step. At this time, the cooperation between the floating piston step and the shutter can push the brake fluid to the liquid outlet hole for braking. At this time, the return elastic member of the shutter is compressed and deformed due to the pressure. When braking stops, the piston body is quickly driven upward by the return spring. When the return elastic member of the shutter is an elastic washer, the elastic washer is a rubber part, and the return speed of the rubber part is slower than that of the spring. The shutter disengages from the floating piston step, and then the return hole leaks, and the brake fluid returns from the return hole to the liquid inlet hole, improving the return speed of the brake fluid until the elastic washer returns to the shutter and abuts against the floating piston step again.

[0010] The beneficial effect of the utility model is: increasing the return hole and improving the return efficiency.

[0011] The following further describes the present utility model in detail with reference to the drawings and embodiments. Description of the Drawings

[0012] Figure 1 It is a schematic cross-sectional view of an embodiment of the present utility model.

[0013] Figure 2 It is a three-dimensional schematic view of the piston body of an embodiment of the present utility model.

[0014] Figure 3 It is a three-dimensional schematic view of an embodiment of the present utility model. Specific Embodiments

[0015] As Figure 1 、 Figure 2 、 Figure 3 shown, a hydraulic pump of a brake handle includes a pump body 1 and a piston disposed in the pump body 1. The pump body 1 is provided with a liquid inlet hole 2 and a liquid outlet hole 3. The piston is provided with a piston rod 4 extending outside the pump body 1. The piston includes a piston body 5. One end above the piston body 5 is connected to the piston rod 4, and a return spring 6 is provided between the other end below and the inner bottom of the pump body 1. The piston body 5 is provided with a floating piston step 7. At least one return hole 8 is axially penetrated through the floating piston step 7. In this embodiment, 6 return holes 8 are provided. A shutter 9 is sleeved below the floating piston step 7 of the piston body 5. The shutter 9 can abut against and block each return hole 8 below the floating piston step 7 when the piston body 5 is stationary or separate from below the floating piston step 7 and leak the return hole 8 when the piston body 5 moves quickly upward. An elastic washer 10 is provided below the shutter 9 of the piston body 5. The elastic washer 10 drives the shutter 9 to abut against below the floating piston step 7 when the piston body 5 is stationary. A limiting step 11 is provided below the elastic washer 10 of the piston body 5. When the piston body 5 is stationary, both ends of the elastic washer 10 abut against the shutter 9 and the limiting step 11 respectively. One end above the piston body 5 is provided with a piston rod connection hole 501 adapted to the piston rod 4.

Claims

1. A hydraulic pump for a brake handle, comprising a pump body and a piston arranged in the pump body, the pump body is provided with a liquid inlet hole and a liquid outlet hole, the piston is provided with a piston rod extending out of the pump body, the piston comprises a piston body, the upper end of the piston body is connected to the piston rod, and a return spring is provided between the lower end and the bottom of the pump body, wherein: The piston body is provided with a floating piston step, and at least one reflux hole is axially penetrated through the floating piston step. The piston body is provided with a baffle under the floating piston step. The baffle can abut against the bottom of the floating piston step and block the reflux holes when the piston body is stationary, or separate from the bottom of the floating piston step and leak out of the reflux holes when the piston body moves upward rapidly. The piston body is provided with a baffle reset elastic member under the baffle, and the baffle reset elastic member drives the baffle to abut against the bottom of the floating piston step when the piston body is stationary.

2. A hydraulic pump for a brake handle according to claim 1, characterized in that: The piston body is provided with a limiting step below the baffle reset elastic member.

3. The hydraulic pump for a brake handle according to claim 1, characterized in that: A piston rod connecting hole adapted to the piston rod is provided at one upper end of the piston body.

4. A hydraulic pump for a brake handle according to claim 1 or 2, characterized in that: The shutter reset elastic member is an elastic washer.

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