CN113968206A

CN113968206A - Vacuum booster for automobile braking system

Info

Publication number: CN113968206A
Application number: CN202111521673.8A
Authority: CN
Inventors: 戴金宝
Original assignee: Anhui Ruirong Auto Parts Co ltd
Current assignee: Anhui Ruirong Auto Parts Co ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-01-25

Abstract

The invention relates to the technical field of automobile parts, in particular to a vacuum booster for an automobile braking system, which comprises a boosting chamber shell and a pedal push rod, wherein the rear side wall of the boosting chamber shell is communicated with a vacuum source connector, the inside of the boosting chamber shell is penetrated and connected with the pedal push rod in a sliding way, a first circular sheet and a diaphragm seat are sequentially fixed on the outer wall of the pedal push rod from back to front, the outer wall of the diaphragm seat is fixed with a partition diaphragm, a plurality of valve components are arranged on the partition diaphragm along the circumference, the outer wall of the front end of the pedal push rod is also provided with a tooth groove, the outer wall of the tooth groove is connected with a driven gear in a meshing manner, the driven gear is installed with the emergency brake preventing component, the outer wall of the pedal push rod is sleeved with a first reset spring and a second reset spring, the front side wall of the stressing chamber shell is communicated with an air inlet pipe, and an air filter and a poppet valve are fixed on the inner wall of the air inlet pipe; the invention can avoid driving danger caused by stepping on the brake suddenly, and has the advantages of ingenious structural design and low manufacturing cost.

Description

Vacuum booster for automobile braking system

Technical Field

The invention relates to the technical field of automobile parts, in particular to a vacuum booster for an automobile braking system.

Background

The vacuum booster is an important part in a braking system, is a cavity with a larger diameter, is internally provided with a diaphragm with a push rod in the middle part, and divides the cavity into two parts, wherein one part is communicated with the atmosphere, and the other part is connected with an air inlet pipe of an engine through a pipeline. The vacuum booster uses the principle that air is sucked in when an engine works to cause vacuum on one side of the booster and uses the pressure difference relative to the normal air pressure on the other side to strengthen braking thrust. Therefore, if the vacuum booster is normal, a great thrust can be generated by only slightly stepping on the brake pedal, so as to brake the rotating wheel.

The existing vacuum assistors still have some disadvantages in design, such as: the service life of a brake system can be shortened and safety accidents can be caused when a driver steps on the brake suddenly; the pressure difference between the two chambers inside the vacuum booster cannot be flexibly adjusted.

Disclosure of Invention

The invention aims at the problems of the background art and designs a vacuum booster for an automobile braking system.

The invention is realized by the following technical scheme:

the utility model provides a vacuum booster for automobile braking system, includes afterburning room casing and footboard push rod, the rear side wall intercommunication of afterburning room casing has the vacuum source to connect, wear to establish and sliding connection in the inside of afterburning room casing have the footboard push rod, the outer wall of footboard push rod is fixed with first ring piece, diaphragm seat, valve piston and second ring piece by back forward in proper order, the outer wall of diaphragm seat is fixed with cuts apart the diaphragm, it installs a plurality of valve component along the circumference on the diaphragm to cut apart, the front end outer wall of footboard push rod has still seted up the tooth's socket, the outer wall meshing of tooth's socket is connected with driven gear, driven gear installs with preventing emergency brake subassembly mutually, the outer wall cover of footboard push rod is equipped with first reset spring and second reset spring, the preceding side wall intercommunication of afterburning room casing has the intake pipe, the inner wall of intake pipe is fixed with air cleaner and poppet valve, the lift valve is matched with the valve piston.

As a further improvement of the scheme, the emergency brake preventing assembly comprises a connecting shaft, connecting pieces, a disc and a friction block, the connecting shaft is fixed between the driven gear and the connecting pieces, a circular groove is formed in the disc, and a rubber ring is bonded on the inner wall of the circular groove.

As a further improvement of the scheme, the outer wall of the connecting piece is hinged with a plurality of friction blocks along the circumferential direction, and a tension spring is fixed between each friction block and the connecting piece.

As a further improvement of the scheme, the valve component comprises a valve sleeve, a connecting plug and a third return spring, the connecting plug is slidably mounted on the inner wall of the valve sleeve, and the third return spring is fixed inside the valve sleeve.

As a further improvement of the scheme, the connecting plug is provided with a circulating air passage, and the outer side wall of the rear end of the valve sleeve is provided with a plurality of air holes.

As a further improvement of the scheme, a one-way valve is arranged inside the vacuum source connector.

As a further improvement of the above solution, the dividing membrane divides the inside of the force application chamber housing into a front chamber and a rear chamber.

As a further improvement of the scheme, the front end of the pedal push rod is hinged with a connecting rod, and a brake pedal is welded on the connecting rod.

As a further improvement of the above solution, the first return spring is disposed between the first annular plate and the inner wall of the thrust chamber housing, and the second return spring is disposed between the second annular plate and the poppet valve.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the emergency brake preventing assembly is arranged and is installed with the driven gear, the driven gear is meshed with the tooth grooves formed in the outer wall of the pedal push rod, when a driver steps on a brake suddenly, the pedal push rod moves rapidly and drives the driven gear to rotate at a high speed, the emergency brake preventing assembly comprises the connecting shaft, the connecting sheet, the disc, the friction blocks and the circular groove, the driven gear drives the connecting sheet to rotate at a high speed through the connecting shaft, the outer wall of the connecting sheet is hinged with the friction blocks along the circumferential direction, the friction blocks are opened by an outward centrifugal force until the friction blocks are in contact with the rubber ring fixed on the inner wall of the circular groove, and the rubber ring has a large friction resistance, so that the movement of the pedal push rod is resisted, and therefore, the driving danger caused by stepping on the brake suddenly can be avoided.

2. In the invention, a plurality of valve components are arranged on a partition membrane along the circumference, each valve component comprises a valve sleeve, a connecting plug and a third return spring, a circulation air passage is arranged on each connecting plug, a plurality of air holes are arranged on the outer side wall of the rear end of each valve sleeve, when a brake pedal is not stepped on, the first return spring is in a natural state, the valve component can be abutted to the inner wall of the front side of a stress application chamber shell, the connecting plug backwards extrudes the third return spring at the moment, the circulation air passage enables a front chamber and a rear chamber to be mutually communicated and pumped to a vacuum state by a vacuum pump of an automobile, when a driver steps on the brake pedal, the third return spring is restored to the natural state and pushes the connecting plug to move forwards, in the moving process, the circulation air passage is gradually closed, the front chamber and the rear chamber are mutually isolated, the inside of the front chamber gradually enters atmospheric pressure to be increased, the rear chamber continuously keeps the vacuum state, at the moment, an obvious pressure difference is formed between the front cavity and the rear cavity, and under the action of the pressure, the partition diaphragm moves backwards and starts to strengthen the braking thrust; in conclusion, the pressure state between the front cavity and the rear cavity can be flexibly adjusted by the arrangement of the valve assembly, so that the function of boosting braking is conveniently realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a perspective view of a first perspective of the present invention;

FIG. 2 is a schematic perspective view of a second perspective view of the present invention

FIG. 3 is a schematic view of the internal structure of the housing of the force application chamber of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 according to the present invention;

FIG. 5 is a schematic view of the installation of the pedal push rod and the emergency brake prevention assembly of the present invention;

fig. 6 is a schematic perspective view of an emergency brake prevention assembly according to the present invention.

Wherein, 1-stress application chamber shell, 2-pedal push rod, 3-vacuum source connector, 4-valve component, 401-valve sleeve, 402-connecting plug, 403-third reset spring, 404-ventilation air channel, 405-air hole, 5-emergency brake component, 501-connecting shaft, 502-connecting sheet, 503-disk, 504-friction block, 505-circular groove, 506-rubber ring, 507-tension spring, 6-first circular ring sheet, 7-diaphragm seat, 8-valve piston, 9-second circular ring sheet, 10-division diaphragm, 11-tooth space, 12-driven gear, 13-first reset spring, 14-second reset spring, 15-air inlet pipe, 16-air filter, 17-lift valve, 18-one-way valve, 19-front chamber, 20-rear chamber, 21-connecting rod, 22-brake pedal.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The invention is further described below with reference to the accompanying drawings.

A vacuum booster for an automobile braking system is disclosed, as shown in figure 1, figure 2 and figure 3, comprising a boosting chamber shell 1 and a pedal push rod 2, wherein the rear side wall of the boosting chamber shell 1 is communicated with a vacuum source connector 3, the vacuum source connector 3 is connected with a vacuum pump of an automobile engine part, a one-way valve 18 is arranged inside the vacuum source connector 3, the one-way valve 18 limits gas to be only pumped out from the inside of the boosting chamber shell 1, the inside of the boosting chamber shell 1 is penetrated and connected with the pedal push rod 2 in a sliding way, a first circular ring sheet 6, a membrane seat 7, a valve piston 8 and a second circular ring sheet 9 are sequentially fixed on the outer wall of the pedal push rod 2 from back to front, a partition membrane 10 is fixed on the outer wall of the membrane seat 7, the partition membrane 10 is slidably installed inside the boosting chamber shell 1, the partition membrane 10 divides the inside of the boosting chamber shell 1 into a front cavity 19 and a rear cavity 20, a plurality of valve components 4 are installed on the partition membrane 10 along the circumference, the outer wall of the front end of the pedal push rod 2 is further provided with a tooth groove 11, the outer wall of the tooth groove 11 is connected with a driven gear 12 in a meshed mode, the driven gear 12 is mounted with the emergency brake preventing assembly 5, a first return spring 13 and a second return spring 14 are sleeved on the outer wall of the pedal push rod 2 in a sleeved mode, the front end of the pedal push rod 2 is hinged to a connecting rod 21, and a brake pedal 22 is welded on the connecting rod 21; the front side wall of the thrust augmentation chamber shell 1 is communicated with an air inlet pipe 15, the inner wall of the air inlet pipe 15 is fixed with an air filter 16 and a poppet valve 17, and the poppet valve 17 is matched with the valve piston 8; the first return spring 13 is arranged between the first circular ring piece 6 and the inner wall of the thrust augmentation chamber shell 1, and the second return spring 14 is arranged between the second circular ring piece 9 and the poppet valve 17.

As shown in fig. 1, 5 and 6, the emergency brake preventing assembly 5 includes a connecting shaft 501, a connecting piece 502, a disc 503 and a friction block 504, the connecting shaft 501 is fixed between the driven gear 12 and the connecting piece 502, the disc 503 is provided with a circular groove 505, and the inner wall of the circular groove 505 is adhered with a rubber ring 506; the outer wall of the connecting piece 502 is hinged with a plurality of friction blocks 504 along the circumferential direction, and a tension spring 507 is fixed between each friction block 504 and the connecting piece 502; when a driver steps on a brake suddenly, the pedal push rod 2 moves rapidly and drives the driven gear 12 to rotate at a high speed, wherein the emergency brake preventing assembly 5 comprises a connecting shaft 501, a connecting piece 502, a disc 503, a friction block 504 and a circular groove 505, the driven gear 12 drives the connecting piece 502 to rotate at a high speed through the connecting shaft 501, the outer wall of the connecting piece 502 is hinged with a plurality of friction blocks 504 along the circumferential direction, the friction blocks 504 are opened under the action of outward centrifugal force until the friction blocks 504 are in contact with a rubber ring 506 fixed on the inner wall of the circular groove 505, and the rubber ring 506 has large friction resistance, so that the movement of the pedal push rod 2 is subjected to resistance, the driving danger caused by stepping on the brake suddenly can be avoided, the structural design is ingenious, the manufacturing cost is low, and the pedal push rod has a good application prospect; when a driver steps on a brake at normal speed, the movable connecting piece 502 cannot rotate at high speed, the outward centrifugal force on the friction blocks 504 is small, a tension spring 507 is fixed between each friction block 504 and the connecting piece 502, the centrifugal force is smaller than the tension of the tension spring 507, the friction blocks 504 and a rubber ring 506 fixed on the inner wall of the circular groove 505 are in a separated state, and therefore the movement of the pedal push rod 2 cannot be resisted by the emergency brake preventing component 5, and the pedal push rod 2 can normally move back and forth; the valve assembly 4 can flexibly adjust the pressure state between the front chamber 19 and the rear chamber 20, so as to realize the function of forced braking.

As shown in fig. 3 and 4, the valve assembly 4 includes a valve sleeve 401, a connecting plug 402 and a third return spring 403, the connecting plug 402 is slidably mounted on the inner wall of the valve sleeve 401, and the third return spring 403 is fixed inside the valve sleeve 401; a circulation air channel 404 is formed in the connecting plug 402, a plurality of air holes 405 are formed in the outer side wall of the rear end of the valve sleeve 401, when the valve assembly 4 abuts against the inner wall of the front side of the stress application chamber shell 1, the connecting plug 402 presses the third return spring 403 backwards, the circulation air channel 404 is communicated with the air holes 405, and the front chamber 19 and the rear chamber 20 are communicated with each other through the circulation air channel 404; after the valve assembly 4 is separated from the front inner wall of the force application chamber housing 1, the third return spring 403 returns to its natural state and pushes the connecting plug 402 forward, during which the communication duct 404 is gradually closed, and the front chamber 19 and the rear chamber 20 are isolated from each other.

In the application process of the invention: the air inlet pipe 15 is communicated with external air, the air can enter the air inlet pipe 15 through the air filter 16 until being blocked by the valve piston 8, and the pressure inside and outside the thrust augmentation chamber shell 1 is balanced; after a vacuum pump of an engine of an automobile is started, air in the rear chamber 20 is pumped out through a pipeline connected with the vacuum source connector 3, and the rear chamber 20 is in a vacuum state at the moment; under the condition that the brake pedal 22 is not stepped on, the first return spring 13 and the second return spring 14 are both in a natural state, the valve piston 8 blocks the poppet valve 17, the valve assembly 4 is abutted to the inner wall of the front side of the boosting chamber shell 1, at the moment, the connecting plug 402 presses the third return spring 403 backwards, and the circulation air channel 404 enables the front chamber 19 and the rear chamber 20 to be communicated with each other and pumped to a vacuum state by a vacuum pump of an automobile; when a driver steps on the brake pedal 22, the second return spring 14 is continuously compressed, the valve piston 8 leaves the poppet valve 17, the poppet valve 17 is in an open state, outside air continuously enters the front chamber 19, the third return spring 403 returns to a natural state and pushes the connecting plug 402 to move forward, the ventilation channel 404 is gradually closed in the moving process, the front chamber 19 and the rear chamber 20 are isolated from each other, the front chamber 19 gradually enters atmospheric pressure to be increased, the rear chamber 20 continuously keeps a vacuum state, a significant pressure difference is formed between the front chamber 19 and the rear chamber 20, the partition diaphragm 10 moves backward and starts to strengthen braking thrust under the action of the pressure, and therefore considerable thrust can be generated only by slightly stepping on the brake pedal 22, and the rotating wheel can be braked.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A vacuum booster for an automotive brake system, comprising a booster housing and a pedal push rod, characterized in that: the utility model discloses a thrust augmentation chamber casing, including thrust augmentation chamber casing, afterburning chamber casing, diaphragm seat, valve piston and second ring piece, the rear side wall intercommunication of thrust augmentation chamber casing has the vacuum source to connect, wear to establish and sliding connection in the inside of thrust augmentation chamber casing the footboard push rod, the outer wall of footboard push rod is fixed with first ring piece, diaphragm seat, valve piston and second ring piece by back forward in proper order, the outer wall of diaphragm seat is fixed with cuts apart the diaphragm, it installs a plurality of valve component along the circumference on the diaphragm to cut apart, the tooth's socket has still been seted up to the front end outer wall of footboard push rod, the outer wall meshing of tooth's socket is connected with driven gear, driven gear installs with the subassembly of preventing emergency braking, the outer wall cover of footboard push rod is equipped with first reset spring and second reset spring, the preceding lateral wall intercommunication of thrust augmentation chamber casing has the intake pipe, the inner wall of intake pipe is fixed with air cleaner and poppet valve.

2. A vacuum booster for a vehicle brake system according to claim 1, characterized in that: prevent emergency brake subassembly includes connecting axle, connection piece, disc and clutch blocks, the connecting axle is fixed in driven gear with between the connection piece, the circular slot has been seted up on the disc, the inner wall bonding of circular slot has the rubber circle.

3. A vacuum booster for a vehicle brake system according to claim 2, characterized in that: the outer wall of connection piece is along circumference articulated a plurality of the clutch blocks, and every the clutch block with all be fixed with the extension spring between the connection piece.

4. A vacuum booster for a vehicle brake system according to claim 1, characterized in that: the valve component comprises a valve sleeve, a connecting plug and a third return spring, the connecting plug is slidably mounted on the inner wall of the valve sleeve, and the third return spring is fixed inside the valve sleeve.

5. A vacuum booster for a vehicle brake system according to claim 1, characterized in that: the connecting plug is provided with a circulation air passage, and the outer side wall of the rear end of the valve sleeve is provided with a plurality of air holes.

6. A vacuum booster for a vehicle brake system according to claim 1, characterized in that: and a one-way valve is arranged in the vacuum source joint.

7. A vacuum booster for a vehicle brake system according to claim 1, characterized in that: the division diaphragm divides the inner part of the force application chamber shell into a front chamber and a rear chamber.

8. A vacuum booster for a vehicle brake system according to claim 1, characterized in that: the front end of the pedal push rod is hinged with a connecting rod, and a brake pedal is welded on the connecting rod.

9. A vacuum booster for a vehicle brake system according to claim 1, characterized in that: the first return spring is arranged between the first circular ring piece and the inner wall of the stressing chamber shell, and the second return spring is arranged between the second circular ring piece and the poppet valve.