CN212354382U

CN212354382U - Brake transmitter for reducing idle stroke of brake system

Info

Publication number: CN212354382U
Application number: CN202021346484.2U
Authority: CN
Inventors: 周玉东; 鞠洪福
Original assignee: Guizhou Xinan Aviation Machinery Co Ltd
Current assignee: Guizhou Xinan Aviation Machinery Co Ltd
Priority date: 2020-07-10
Filing date: 2020-07-10
Publication date: 2021-01-15
Anticipated expiration: 2030-07-10

Abstract

The utility model discloses a brake transmitter for reducing the idle stroke of a brake system, which comprises a shell, a large bushing fixed in the shell, a large piston arranged in the inner hole of the large bushing, and a large leather cup arranged between the large piston and the large bushing, wherein the large leather cup can move in the inner hole of the large bushing along with the large piston; one end of the small piston is fixed in the shell through the push rod assembly, the other end of the small piston penetrates through the inner hole of the large piston, the other end of the small piston is further provided with a small leather cup which can move in the inner hole of the small bushing fixed in the shell along with the other end of the small piston, a return spring is arranged between the large piston and the large bushing, a large spring is arranged between the large piston and the push rod assembly, and oil through holes are formed in the large bushing and the small bushing along the radial direction. The structure of two-stage pistons is adopted, so that the moving distance of the large piston can be effectively reduced.

Description

Brake transmitter for reducing idle stroke of brake system

Technical Field

The utility model relates to an wheel braking system hydraulic brake technical field especially relates to a reduce brake transmitter of braking system idle stroke.

Background

The hydraulic mechanical airplane wheel braking system in China mainly comprises an airplane wheel braking transmitter, a braking distribution valve and a braking device, wherein a driver pedal is connected with the airplane wheel braking transmitter, the driver transmits operating force to the braking transmitter through the pedal to push a piston of the braking transmitter to move so as to convey oil into the braking distribution valve to open the distribution valve, and the distribution valve decompresses high-pressure oil and then receives the decompressed oil into the braking device to brake. Because the brake transmitter and the brake distribution valve have idle strokes, oil is consumed by oil compression, hose expansion deformation and the like between the transmitter and the distribution valve and between the distribution valve and the brake device, when a driver operates a pedal to eliminate the idle strokes of the transmitter and the distribution valve, the system can build pressure only after moving for a certain distance, and the idle strokes of the driver and the operation force are completely different by different brake transmitter structures. This puts high demands on the structural design of the transmitter.

At present, the structure of the transmitter in China is in a primary piston form, mainly the difference of the area of the piston, but certain defects exist. Although the idle stroke of the large-area piston structure is small, the operating force is large during braking, and although the operating force of the small-area piston structure is small, a driver needs to step on a long distance to feel pressure, the idle stroke of the system accounts for nearly one third of the total stroke of the transmitter, and the operating experience of the driver is poor.

SUMMERY OF THE UTILITY MODEL

Purpose of the utility model

To the above problem, the utility model provides a reduce brake transmitter of braking system idle stroke.

Technical solution of utility model

A brake transmitter for reducing idle stroke of a brake system comprises a shell, a large bushing is fixed in the shell, a large piston is arranged in an inner hole of the large bushing, a large leather cup is arranged between the large piston and the large bushing, and the large leather cup can move in the inner hole of the large bushing along with the large piston; one end of the small piston is fixed in the shell through the push rod assembly, the other end of the small piston penetrates through the inner hole of the large piston, the other end of the small piston is further provided with a small leather cup which can move in the inner hole of the small bushing fixed in the shell along with the other end of the small piston, a return spring is arranged between the large piston and the large bushing, a large spring is arranged between the large piston and the push rod assembly, and oil through holes are formed in the large bushing and the small bushing along the radial direction.

Preferably, the push rod assembly, the small piston, the large bushing, the large cup, the small cup and the small bushing 6 are coaxial.

Preferably, the push rod assembly is in threaded connection with one end of the small piston.

Preferably, one end of the large bushing is limited by a positioning sleeve arranged in the shell, and the other end of the large bushing is limited by the shell.

Preferably, the positioning sleeve is in threaded connection with an inner hole of the shell, an annular groove is formed in the outer circumferential surface of the middle of the positioning sleeve, an oil through hole is formed in the annular groove, an oil filling port is formed in the shell, and oil can enter an inner cavity of the shell through the oil filling port and the oil filling port in the annular groove.

Preferably, the shell is further provided with an output cavity, and the output cavity is communicated with the inner hole of the small bushing.

Preferably, the small piston is in clearance fit with the large piston, and a third sealing ring is arranged between the small piston and the large piston.

Preferably, the initial elastic force of the large spring is larger than the initial elastic force of the return spring and larger than the sum of the hydraulic pressure, the elastic force of the return spring, the friction force between the large leather cup and the inner hole of the large bushing, the friction force between the small leather cup and the inner hole of the small bushing, the sealing ring III and the sealing friction force of the small piston when the large piston moves to the limit position.

Preferably, sealing rings are arranged between the large bushing and the shell, between the small bushing and the shell, and between the push rod assembly and the positioning sleeve.

The utility model has the advantages that: the structure of adopting the two-stage piston adopts big piston chamber to eliminate system idle stroke, little piston chamber and brakes, under the unchangeable condition of brake distribution valve, brake equipment, pipe-line system, can effectively reduce the displacement of big piston, has reduced the idle stroke of system, and because the work of little piston chamber during the braking, hydraulic pressure effort is less, consequently this structure can reach the beneficial effect that reduces braking system idle stroke under the prerequisite that satisfies driver's operating force requirement.

Drawings

Fig. 1 is the utility model discloses a reduce brake transmitter's of braking system idle stroke structural schematic diagram.

In the figure: 1-push rod assembly, 2-locating sleeve, 3-return spring, 4-large bush, 5-seal ring I, 6-small bush, 7-seal ring II, 8-shell, 11-push rod, 12-large spring, 13-small piston, 14-large piston, 15-seal ring III, 16-large cup, 17-small cup, 141-limit step, 41-oil through hole, 61-end groove and 62-oil through hole.

Detailed Description

The utility model discloses a realize through following technical scheme.

A brake transmitter for reducing the idle stroke of a brake system comprises a shell 8, wherein one end of a large bushing 4 is limited through a positioning sleeve 2 arranged in the shell 8, and the other end of the large bushing is limited through the shell 8. The locating sleeve 2 is in threaded connection with an inner hole of the shell 8, an annular groove is formed in the outer circumferential surface of the middle of the locating sleeve 2, an oil through hole is formed in the annular groove, an oil injection port is formed in the shell 8, and oil can enter an inner cavity of the shell 8 through the oil injection port and the oil injection port in the annular groove.

The large piston 14 is arranged in the inner hole of the large bushing 4, a large leather cup 16 is arranged between the large piston 14 and the large bushing 4, and the large leather cup 16 can move in the inner hole of the large bushing 4 along with the large piston 14; one end of a small piston 13 is in threaded connection with the push rod assembly 1, the other end of the small piston passes through an inner hole of a large piston 14, a small leather cup 17 is further arranged at the other end of the small piston 13, an annular step is arranged on the outer circumferential surface of the small piston 13 between the small leather cup 17 and the large piston 14, the small leather cup 17 can move in the inner hole of the small bushing 6 along with the other end of the small piston 13, one end, far away from the small piston 13, of the small bushing 6 is limited by a shell 8, a return spring 3 is arranged between the large piston 14 and the large bushing 4, and a large spring 12 is arranged between the large piston. The largest outer diameter of the large piston 14 is smaller than the inner diameter of the positioning sleeve 2, the small piston 13 is in clearance fit with the large piston 14, and a third sealing ring 15 is arranged between the small piston 13 and the large piston 14. Oil through holes are arranged on the large bush 4 and the small bush 6 along the radial direction. The push rod component 1, the small piston 13, the large piston 14, the large bushing 4, the large cup 16, the small cup 17 and the small bushing 6 are coaxial. The push rod assembly 1 penetrates through an inner hole of the positioning sleeve 2 and is limited by an annular step on the outer circumferential surface of the push rod assembly 1. An output cavity is further formed in the shell 8 and communicated with an inner hole of the small bushing 6.

The initial elastic force of the large spring 12 is larger than the initial elastic force of the return spring 3 and larger than the sum of the hydraulic pressure borne by the large piston 14 when the large piston moves to the limit position, the elastic force of the return spring 3, the friction force between the large leather cup 16 and the inner hole of the large bushing 4, the friction force between the small leather cup 17 and the inner hole of the small bushing 6, and the sealing friction force between the third sealing ring 15 and the small piston 13.

Sealing rings are arranged between the large bushing 4 and the shell 8, between the small bushing 6 and the shell 8 and between the push rod assembly 1 and the positioning sleeve 2.

The large piston 14, the large cup 16 and the large bush 4 form a large piston cavity, the small piston 13, the small cup 17 and the small bush 6 form a small piston cavity, and the large piston cavity and the small piston cavity form a two-stage piston sealing piston cavity structure. The oil through hole on the small bush 6 can be communicated with the large piston cavity and the small piston cavity, and the oil through hole on the large bush 4 can be communicated with the large piston cavity and the inner cavity of the shell.

The working process is as follows: in the initial state, because the large bush 4 and the small bush 6 are provided with oil through holes, the oil is filled in the large spring, the large piston cavity and the small piston cavity. When the operating force is applied, the elastic force of the large spring 12 is greater than that of the return spring 3, the large spring 12 is not compressed and the return spring 3 is compressed under the operating force, the push rod assembly 1 pushes the large spring 12, the large piston 14 and the small piston 13 to integrally move, and when the oil hole in the large bushing 4 is blocked by the large cup 16, the inner cavity of the shell where the large spring is located is disconnected with the large piston cavity, namely, the idle stroke of the transmitter is eliminated. The push rod assembly 1 is continuously pushed to eliminate the output oil, the large piston 14 stops moving after the idle stroke generated by the distribution valve, the brake device, the system oil compression, the hose deformation and the like is limited until the limit step 141 on the outer circumferential surface of the large piston 14 is contacted with the large bush 4, the oil through holes on the small bush 6 are closed successively, because the big piston 14 of the big spring 12 is subject to the sum of the hydraulic pressure when moving to the limit position, the elastic force of the return spring 3, the friction force between the big leather cup 16 and the inner hole of the big bush 4, the friction force between the small leather cup 17 and the inner hole of the small bush 6, the sealing ring III 15 and the sealing friction force of the small piston 13, the big piston 12 can not move back, the output volume of the oil liquid at the stage is equivalent to the volume of the liquid output by the large piston 14, so that the moving distance of the large piston can be effectively reduced and the idle stroke of the system is reduced under the condition that a brake distribution valve, a brake device and a pipeline system are not changed. And then the push rod assembly 1 is continuously pushed, the large spring 12 works, the push rod assembly 1 pushes the small piston 13 to compress the oil liquid to output specified pressure for braking, and finally the braking pressure only acts on the small piston 13, so that the operating force during braking is effectively reduced. The product adopts the structure of two-stage piston chamber to provide oil to the system promptly, makes the product reach the effect that reduces braking system idle stroke under the prerequisite that satisfies driver's operating force requirement.

The above embodiments are only for illustrating the technical conception and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the same, so as not to limit the protection scope of the present invention, and all the equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention. The technology, shape and construction parts which are not described in detail in the present invention are all known technology.

Claims

1. A brake transmitter for reducing the idle stroke of a brake system is characterized in that a shell (8), a large bushing (4) is fixed in the shell (8), a large piston (14) is arranged in an inner hole of the large bushing (4), a large leather cup (16) is arranged between the large piston (14) and the large bushing (4), and the large leather cup (16) can move in the inner hole of the large bushing (4) along with the large piston (14); one end of a small piston (13) is fixed in the shell (8) through the push rod assembly (1), the other end of the small piston penetrates through an inner hole of a large piston (14), a small leather cup (17) is further arranged at the other end of the small piston (13) and can move along with the other end of the small piston (13) in an inner hole of a small bushing (6) fixed in the shell (8), a return spring (3) is arranged between the large piston (14) and the large bushing (4), a large spring (12) is arranged between the large piston (14) and the push rod assembly (1), and oil through holes are formed in the large bushing (4) and the small bushing (6) along the radial direction.

2. A brake transmitter for reducing idle stroke of a braking system according to claim 1, wherein the push rod assembly (1), the small piston (13), the large piston (14), the large bushing (4), the large cup (16), the small cup (17) and the small bushing (6) are coaxial.

3. A brake transmitter for reducing idle stroke of a braking system according to claim 1, wherein the push rod assembly (1) is threadedly coupled to one end of the small piston (13).

4. A brake transmitter for reducing the idle stroke of a braking system according to claim 1, wherein one end of the large bushing (4) is restrained by a locating sleeve (2) disposed in the housing (8), and the other end is restrained by the housing (8).

5. The brake transmitter for reducing the idle stroke of the brake system as claimed in claim 4, wherein the locating sleeve (2) is threadedly connected to the inner bore of the housing (8), the outer circumferential surface of the middle portion of the locating sleeve (2) is provided with an annular groove, the annular groove is provided with an oil through hole, the housing (8) is provided with an oil injection port, and oil can enter the inner cavity of the housing (8) through the oil injection port and the oil injection port of the annular groove.

6. A brake transmitter for reducing the idle stroke of a braking system as claimed in claim 1, wherein the housing (8) is further provided with an output chamber, and the output chamber is communicated with the inner hole of the small bush (6).

7. A brake transmitter for reducing idle stroke of a braking system according to claim 1, wherein the small piston (13) is in clearance fit with the large piston (14) and a third seal (15) is provided between the small piston (13) and the large piston (14).

8. The brake transmitter for reducing the idle stroke of the brake system as claimed in claim 7, wherein the initial elastic force of the large spring (12) is greater than the initial elastic force of the return spring (3) and greater than the sum of the hydraulic pressure applied when the large piston (14) moves to the limit position, the elastic force of the return spring (3), the friction force between the large cup (16) and the inner hole of the large bushing (4), the friction force between the small cup (17) and the inner hole of the small bushing (6), and the sealing friction force between the sealing ring III (15) and the small piston (13).

9. The brake transmitter for reducing the idle stroke of the brake system as claimed in claim 1, wherein sealing rings are arranged between the large bushing (4) and the housing (8), between the small bushing (6) and the housing (8), and between the push rod assembly (1) and the positioning sleeve (2).