CN214492878U

CN214492878U - Automobile vacuum booster

Info

Publication number: CN214492878U
Application number: CN202120635254.6U
Authority: CN
Inventors: 孙建涛; 张灿为; 徐满; 谢安宇; 刘奇峰
Original assignee: Guangzhou Automobile Group Co Ltd
Current assignee: Guangzhou Automobile Group Co Ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2021-10-26
Anticipated expiration: 2031-03-29

Abstract

The utility model provides an automobile vacuum booster relates to the vacuum booster field. The automobile vacuum booster comprises a front shell, a rear shell and a diaphragm, wherein the front shell and the rear shell are hermetically connected to form a main cavity body, the diaphragm is movably arranged in the main cavity body in a separated mode, and a reset elastic piece is connected to the diaphragm; a first cavity is formed between the diaphragm and the front shell, the front shell is connected with an air exhaust structure, a second cavity is formed between the diaphragm and the rear shell, the edge of the diaphragm is provided with a ring edge, the inner wall of the front shell is provided with a ring groove, and the ring edge is assembled in the ring groove in a sealing and sliding manner; the diaphragm is connected with transmission structure, and transmission structure runs through the tip to the backshell outside and is used for being connected with brake pedal, and transmission structure runs through the tip to the preceding shell outside and is used for being connected with sensing element, and sensing element is used for sending actuating signal to the structure of bleeding when transmission structure top touches to with first cavity suction become vacuum state. The original edge contact matching is improved into double-sided fit matching between the ring edge and the ring groove, and the sealing effect and the reliability are improved.

Description

Automobile vacuum booster

Technical Field

The utility model relates to a vacuum booster technical field especially relates to an automobile vacuum booster.

Background

The vacuum booster is a device for increasing the acting force applied on a pedal by a driver, is usually arranged between a brake pedal and a brake master cylinder and mainly comprises a front shell, a rear shell and a diaphragm, wherein the diaphragm divides an inner cavity into a vacuum cavity and a gas cavity, and the boosting effect is generated by utilizing the air pressure difference of the two cavities.

At present, current vacuum booster discloses this vacuum booster includes preceding shell, backshell and air chamber diaphragm, one side fixedly connected with backshell of preceding shell, preceding shell and backshell are through connecting take a fixed connection, the opposite side embedding of preceding shell is connected with the push rod, one side embedding of backshell is connected with one-way vacuum intake pipe, the middle part nested connection of push rod has push rod return spring, one side that the push rod is close to push rod return spring is equipped with the valve port that admits air, the opposite side swing joint of push rod has the slide, one side swing joint that the push rod is close to the slide has the brake lever, the inside nested connection of preceding shell has the air chamber diaphragm, the bottom swing joint of brake lever has diaphragm return spring. And the inner wall of the front shell is tightly attached with a lubricating layer, and the side surface of the air chamber diaphragm is tightly attached with a high-temperature wear-resistant layer.

When the automobile vacuum booster in the prior art is used for stepping down the brake pedal, the air inlet valve port is closed, the one-way vacuum air inlet pipe vacuumizes the cavity on one side of the rear shell, and the air chamber diaphragm is pulled to one side of the brake rod under the action of negative pressure, so that the function of amplifying the brake pedal force is realized. However, after the vacuum booster runs for a long time, the diaphragm is abraded due to repeated friction between the diaphragm and the cavity wall, so that the sealing effect is reduced, and the boosting performance of the vacuum booster fails.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, an object of the utility model is to provide a car vacuum booster to solve when vacuum booster after long-term operation, because the repeated friction between diaphragm and the chamber wall, lead to the diaphragm to produce wearing and tearing and reduce sealed effect, the problem that vacuum booster's helping hand performance became invalid.

The utility model discloses a car vacuum booster's technical scheme does:

the automobile vacuum booster comprises a front shell, a rear shell and a diaphragm, wherein the front shell and the rear shell are hermetically connected to form a main cavity body, the diaphragm is movably arranged in the main cavity body in a separated mode, and a reset elastic piece is connected to the diaphragm;

a first cavity is formed between the diaphragm and the front shell, the front shell is connected with an air exhaust structure, a second cavity is formed between the diaphragm and the rear shell, the edge of the diaphragm is provided with a ring edge, the inner wall of the front shell is provided with a ring groove, and the ring edge is assembled in the ring groove in a sealing and sliding manner;

the diaphragm is connected with transmission structure, transmission structure runs through to the tip in the backshell outside is used for being connected with brake pedal, transmission structure runs through to the tip in the preceding shell outside is used for being connected with sensing element, sensing element is used for when transmission structure touches on the top to the structure of bleeding sends actuating signal, with first cavity suction becomes vacuum state.

Further, the ring is along being equipped with a plurality of circumference interval distribution's positioning groove, and is a plurality of positioning groove is along being on a parallel with the axis direction of main cavity extends, the inner wall of annular still is equipped with the location bead, positioning groove with the location bead direction matches.

Furthermore, the transmission structure comprises a push rod connected to one side, close to the rear shell, of the diaphragm, a first central hole is formed in the middle of the rear shell, the push rod penetrates through the first central hole, a vent hole is formed in the rear shell, and the first end of the push rod is used for being connected with a brake pedal.

Furthermore, the transmission structure further comprises a connecting rod connected to one side, close to the front shell, of the diaphragm, a second central hole is formed in the middle of the front shell, the connecting rod is arranged in the second central hole in a sealing and penetrating mode, and the sensing element is arranged at the first end of the connecting rod.

Furthermore, a buffering elastic part is arranged between the second end of the push rod and the second end of the connecting rod.

Furthermore, the second end of push rod is equipped with the transmission seat, the transmission seat with diaphragm sealing connection, just be equipped with the outer cover on the transmission seat, the second end of connecting rod is equipped with interior barrel, the outer cover with interior barrel activity suit cooperation, just buffering elastic component roof pressure installation the outer cover with between the interior barrel.

Furthermore, the elastic reset piece comprises a first reset spring and a second reset spring, the first reset spring is connected between the front shell and the diaphragm, and the second reset spring is connected between the rear shell and the diaphragm.

Furthermore, the number of the first return springs is at least two, and the at least two first return springs are arranged in a central symmetry mode around the center of the diaphragm; the second return springs are also provided with at least two, and the at least two second return springs are arranged in central symmetry relative to the center of the diaphragm.

Further, an air exhaust valve is arranged on the front shell, the air exhaust structure is a first air pump, and a first air guide pipe is connected between the air exhaust valve and the first air pump.

Furthermore, a second air pump and a second air duct are arranged on the rear shell, and the second air duct extends into the second cavity.

Has the advantages that: this car vacuum booster adopts the edge of diaphragm to set up ring edge, the inner wall of preceding shell sets up the annular, the ring edge of diaphragm and the sealed sliding assembly's of annular structural design of preceding shell, match to improve for ring edge and the two-sided laminating between the annular by original edge contact and match, sealed area of contact between diaphragm and the preceding shell has been increased, sealing effect and reliability have been improved, the wearing and tearing of diaphragm and reduction sealing effect after having avoided long-term operation, vacuum booster's helping hand performance is more stable.

In the use, when the driver tramples the brake pedal, the brake pedal drives transmission structure and diaphragm to move towards the shell direction, meanwhile, transmission structure top touch is located the sensing element in the shell outside before, sensing element sends actuating signal to the structure of bleeding, the work of control structure of bleeding becomes vacuum state with first cavity of suction, the pressure that is located the first cavity and the second cavity of diaphragm both sides is different, thereby formed the pressure differential helping hand towards the shell direction to the diaphragm, brake pedal force to the driver plays the amplification effect, real pedal feel is truer.

When a driver releases the brake pedal, the diaphragm moves towards the direction of the rear shell under the elastic action of the reset elastic piece, meanwhile, a starting signal disappears after the transmission structure is separated from the sensing element, the sensing element controls the air exhaust structure to inflate the first cavity to increase the internal air pressure, the diaphragm, the transmission structure and the brake pedal are enabled to return quickly, and then the sensing element is powered off to the air exhaust structure to complete the whole process of one-time braking.

Drawings

Fig. 1 is a schematic perspective view of an automotive vacuum booster according to an embodiment 1 of the present invention;

FIG. 2 is a cross-sectional schematic view of the automotive vacuum booster of FIG. 1;

fig. 3 is an assembly diagram of the diaphragm and the return spring member in embodiment 1 of the vacuum booster of the present invention.

In the figure: 1-front shell, 10-ring groove, 100-positioning convex rib, 11-first air duct, 12-air exhaust valve, 2-rear shell, 21-second air duct, 22-second air pump, 23-air vent, 3-diaphragm, 30-ring edge, 300-positioning groove, 40-buffering elastic piece, 41-push rod, 42-connecting rod, 43-transmission seat, 44-inner cylinder, 45-outer sleeve, 51-first return spring and 52-second return spring.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

The embodiment 1 of the present invention, as shown in fig. 1 to 3, comprises a front shell 1, a rear shell 2 and a diaphragm 3, wherein the front shell 1 and the rear shell 2 are hermetically connected to form a main cavity, the diaphragm 3 is movably and separately disposed in the main cavity, and the diaphragm 3 is connected to a return elastic member; a first cavity is formed between the diaphragm 3 and the front shell 1, the front shell 1 is connected with an air exhaust structure, a second cavity is formed between the diaphragm 3 and the rear shell 2, the edge of the diaphragm 3 is provided with a ring edge 30, the inner wall of the front shell 1 is provided with a ring groove 10, and the ring edge 1 is assembled in the ring groove 10 in a sealing and sliding manner; the diaphragm 3 is connected with transmission structure, and transmission structure runs through the tip that runs through to the 2 outsides of backshells and is used for being connected with brake pedal, and transmission structure runs through the tip that runs through to the 1 outside of preceding shell and is used for being connected with sensing element, and sensing element is used for sending actuating signal to the structure of bleeding when transmission structure top touches to with first cavity suction become vacuum state.

This car vacuum booster adopts the edge of diaphragm 3 to set up ring edge 30, the inner wall of preceding shell 1 sets up annular 10, the ring edge 30 of diaphragm 3 and the sealed sliding assembly's of annular 10 structural design of preceding shell 1 structural design, match to improve for the ring edge 30 and match for the two-sided laminating between annular 10 by original marginal contact, the sealed area of contact between diaphragm 3 and the preceding shell 1 has been increased, sealing effect and reliability have been improved, 3 wearing and tearing of diaphragm and reducing sealed effect after having avoided long-term operation, vacuum booster's helping hand performance is more stable.

In the use, when the driver tramples the brake pedal, the brake pedal drives transmission structure and diaphragm 3 to move towards 1 direction of casing, meanwhile, transmission structure top touch is located the sensing element in the casing 1 outside before, sensing element sends actuating signal to the structure of bleeding, the work of control structure of bleeding becomes vacuum state with first cavity of suction, the pressure that is located the first cavity and the second cavity of 3 both sides of diaphragm is different, thereby formed the pressure differential helping hand towards 1 direction of casing to diaphragm 3, brake pedal force to the driver plays the amplification effect, the actual pedal feel of trampling is truer.

When a driver releases the brake pedal, the diaphragm 2 moves towards the direction of the rear shell 2 under the elastic action of the reset elastic piece, meanwhile, a starting signal disappears after the transmission structure is separated from the sensing element, the sensing element controls the air exhaust structure to inflate the first cavity to increase the internal air pressure, the diaphragm 3, the transmission structure and the brake pedal are enabled to return quickly, and then the sensing element cuts off the power of the air exhaust structure to complete the whole process of one-time braking.

In this embodiment, the ring rim 30 is provided with a plurality of circumferentially spaced positioning grooves 300, the plurality of positioning grooves 300 extend parallel to the axial direction of the main cavity, the inner wall of the ring groove 10 is further provided with a positioning rib 100, and the positioning grooves 300 are matched with the positioning rib 100 in a guiding manner. Through set up positioning groove 300, the inner wall of annular groove 10 sets up location bead 100 on ring edge 30, not only makes ring edge 30 slide motion precision in annular groove 10 higher, has further increased the area of contact of ring edge 30 and annular groove 10 inner wall moreover, has improved the sealed effect of removal between the two.

Wherein, transmission structure is including connecting the push rod 41 that is close to backshell 2 one side at diaphragm 3, and first centre bore has been seted up at the middle part of backshell 2, and push rod 41 runs through and sets up in first centre bore, has still seted up air vent 23 on backshell 2, and the first end of push rod 41 is used for being connected with brake pedal. The transmission structure further comprises a connecting rod 42 connected to one side of the diaphragm 3 close to the front shell 1, a second central hole is formed in the middle of the front shell 1, the connecting rod 42 is arranged in the second central hole in a sealing and penetrating mode, and the sensing element is arranged at a first end of the connecting rod 42. A buffering elastic member 40 is further provided between the second end of the push rod 41 and the second end of the link 42.

Specifically, a transmission seat 43 is disposed at the second end of the push rod 41, the transmission seat 43 is connected to the diaphragm 3 in a sealing manner, an outer sleeve 45 is disposed on the transmission seat 43, an inner cylinder 44 is disposed at the second end of the connecting rod 42, the outer sleeve 45 is movably sleeved with the inner cylinder 44, and the buffering elastic member 40 is installed between the outer sleeve 45 and the inner cylinder 44 in a pressing manner. The buffering elastic part 40 is arranged between the push rod 41 and the connecting rod 42, and the buffering elastic part 40 is a cylindrical pressure spring, so that the buffering force transmission effect can be realized on the movement of the push rod 41, the enough stepping stroke of the brake pedal can be ensured, and the effective jacking effect on a sensing element can be realized.

In the present embodiment, the return elastic member includes a first return spring 51 and a second return spring 52, the first return spring 51 is connected between the front case 1 and the diaphragm 3, and the second return spring 52 is connected between the rear case 2 and the diaphragm 3. The first return springs 51 are provided with at least two, and the at least two first return springs 51 are arranged in central symmetry about the center of the diaphragm 3; the second return springs 52 are also provided with at least two, at least two second return springs 52 also being arranged centrosymmetrically with respect to the center of the diaphragm 3. Specifically, two first return springs 51 and two second return springs 52 are provided, and the first return springs 51 and the second return springs 52 are respectively and correspondingly arranged on two sides of the diaphragm 3, so that when the brake pedal is stepped on, the elastic acting force of the elastic member needs to be reset, the first return springs 51 are compressed, and the second return springs 52 are stretched; when the brake pedal is released, the first return spring 51 and the second return spring 52 generate a return acting force on the diaphragm 3, so that the diaphragm 3 and the brake pedal are quickly returned.

In addition, an air extracting valve 12 is arranged on the front shell 1, the air extracting structure is a first air pump, and a first air guide pipe 11 is connected between the air extracting valve 12 and the first air pump. And, the rear shell 2 is provided with a second air pump and a second air duct 21, and the second air duct 21 extends into the second chamber. Through the synchronous reverse work of the first air pump and the second air pump, when the first air pump pumps air to the first chamber, the second air pump inflates air to the second chamber; when the first air pump inflates the first chamber, the second air pump exhausts the second chamber, so that the chambers on two sides of the diaphragm form a larger air pressure difference all the time, and the power assisting effect and the return reaction of the pedal are improved.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims

1. An automobile vacuum booster is characterized by comprising a front shell, a rear shell and a diaphragm, wherein the front shell and the rear shell are hermetically connected to form a main cavity, the diaphragm is movably arranged in the main cavity in a separated mode, and a reset elastic piece is connected to the diaphragm;

2. The vacuum booster of claim 1, wherein the ring edge is provided with a plurality of circumferentially spaced positioning grooves, the plurality of positioning grooves extend in a direction parallel to the axis of the main cavity, the inner wall of the ring groove is further provided with a positioning rib, and the positioning grooves are matched with the positioning rib in a guiding manner.

3. The vacuum booster of claim 1, wherein the transmission structure comprises a push rod connected to a side of the diaphragm close to the rear shell, a first central hole is formed in the middle of the rear shell, the push rod is arranged in the first central hole in a penetrating manner, a vent hole is further formed in the rear shell, and a first end of the push rod is used for being connected with a brake pedal.

4. The vacuum booster of claim 3, wherein the transmission structure further comprises a connecting rod connected to a side of the diaphragm close to the front shell, a second central hole is formed in a middle portion of the front shell, the connecting rod is sealingly disposed in the second central hole, and the sensing element is disposed at a first end of the connecting rod.

5. The vacuum booster of claim 4, wherein a buffering elastic member is further disposed between the second end of the push rod and the second end of the connecting rod.

6. The vacuum booster as claimed in claim 5, wherein the second end of the push rod has a driving seat, the driving seat is connected to the diaphragm in a sealing manner, the driving seat has an outer sleeve, the second end of the connecting rod has an inner cylinder, the outer sleeve is movably fitted with the inner cylinder, and the buffering elastic member is installed between the outer sleeve and the inner cylinder in a pressing manner.

7. The vacuum booster of any one of claims 1 to 6, wherein the return elastic member comprises a first return spring and a second return spring, the first return spring being connected between the front housing and the diaphragm, and the second return spring being connected between the rear housing and the diaphragm.

8. The vacuum booster of claim 7, wherein the first return springs are provided in at least two, and at least two of the first return springs are arranged in a central symmetry with respect to the center of the diaphragm; the second return springs are also provided with at least two, and the at least two second return springs are arranged in central symmetry relative to the center of the diaphragm.

9. The vacuum booster of claim 1, wherein the front shell is provided with an air suction valve, the air suction structure is a first air pump, and a first air duct is connected between the air suction valve and the first air pump.

10. The vehicle vacuum booster of claim 1, wherein the rear shell is provided with a second air pump and a second air duct, and the second air duct extends into the second chamber.