CN113844419A - Structure for improving power assisting effect of vacuum booster - Google Patents

Abstract

The invention discloses a structure for improving the power assisting effect of a vacuum booster, which comprises a power assisting push rod, a compression cavity, a transition cavity, a high pressure cavity and a vacuum cavity, wherein the compression cavity, the transition cavity, the high pressure cavity and the vacuum cavity are sequentially connected. A piston, a sealing disc and a first return plate are arranged on the side wall of the power-assisted push rod, the piston is located in the compression cavity, the first return plate is located in the transition cavity, and the transition cavity and the sealing cavity can be isolated by the sealing disc; a return spring is arranged between the first return plate and the sealing plate. The high-pressure cavity and the vacuum cavity are separated by a diaphragm, a valve body is arranged in the middle of the diaphragm, a main cylinder push rod is arranged in the valve body, an air valve seat is arranged at one end, facing the transition cavity, of the main cylinder push rod, and the power-assisted push rod is matched with the groove; the one end that the transition chamber is close to the vacuum cavity is equipped with the rubber valve, is equipped with first valve spring between rubber valve and the first return plate, is equipped with annular rubber valve between rubber valve and the valve body. The invention can increase the pressure difference between two sides of the diaphragm of the vacuum booster under the condition of lower vacuum degree, thereby improving the safety of vehicles.

Description

Structure for improving power assisting effect of vacuum booster

Technical Field

The invention relates to the technical field of automobile braking, in particular to a structure for improving the boosting effect of a vacuum booster.

Background

The automobile brake vacuum booster assembly product is a safety part in an entire automobile brake system, and the vacuum booster is used for realizing a brake boosting mechanism, so that a driver does not need to use large force when stepping on a brake pedal, and large brake force can be realized.

The vacuum booster is installed together with the brake pedal, when the driver steps on the brake pedal, two sides of the booster are respectively vacuum and atmospheric pressure, and therefore boosting is achieved through pressure difference, and the driver is light and convenient to brake.

The existing vacuum boosters are all vacuum boosters with mature structures. The helping hand effect of vacuum booster mainly receives two aspects factors to influence: 1. vacuum booster area; 2. the pressure difference between the two sides of the diaphragm of the vacuum booster; the vacuum booster is generally limited by installation space, can only be selected from the existing specifications, and is basically an unchangeable factor; therefore, the boosting effect of the vacuum booster is mainly influenced by the pressure difference on two sides of the vacuum booster, if the pressure difference on two sides of the diaphragm is small, the brake pedal is hard, the braking effect is poor, sufficient braking force cannot be generated during braking, and the potential safety hazard that the brake cannot be stopped exists.

Therefore, how to provide a vacuum booster capable of effectively increasing the pressure difference between two sides of the diaphragm of the vacuum booster is a technical problem which needs to be solved in the field.

Disclosure of Invention

The invention aims to provide a structure for improving the boosting effect of a vacuum booster, which is used for increasing the pressure difference between two sides of a diaphragm of the vacuum booster under the condition that a vacuum source is limited, namely the vacuum degree is lower, so that the safety of a vehicle is improved.

According to one aspect of the invention, the structure for improving the power assisting effect of the vacuum booster comprises a power assisting push rod, a compression cavity, a transition cavity, a high pressure cavity and a vacuum cavity which are sequentially connected, wherein the power assisting push rod is arranged in the compression cavity and the transition cavity;

a piston, a sealing disc and a first return plate are arranged on the side wall of the power-assisted push rod, the piston is located in the compression cavity, the first return plate is located in the transition cavity, and the sealing disc can isolate the transition cavity from the sealing cavity; a return spring is arranged between the first return plate and the sealing disc;

the high-pressure cavity and the vacuum cavity are separated by a diaphragm, a valve body is arranged in the middle of the diaphragm, a main cylinder push rod is arranged in the valve body, an air valve seat is arranged at one end, facing the transition cavity, of the main cylinder push rod, a groove is formed in the end portion of the air valve seat, and the power-assisted push rod is matched with the groove so as to drive the main cylinder push rod to move; a rubber valve is arranged at one end, close to the vacuum cavity, of the transition cavity, a first valve spring is arranged between the rubber valve and the first return plate, an annular rubber valve is arranged between the rubber valve and the valve body, a pushing plate is further arranged at the end part of the air valve seat, the pushing plate abuts against the rubber valve and separates the transition cavity from the high-pressure cavity, and a pushing distance is arranged between the pushing plate and the valve body; when the boosting push rod drives the main cylinder push rod to move, the air valve seat moves, the rubber valve below the pushing plate is far away from the pushing plate, and the transition cavity is communicated with the high-pressure cavity so as to achieve the boosting effect.

Optionally, according to the structure for improving the assisting effect of the vacuum booster, an inclined frustum which contracts inwards is arranged in the middle of the rubber valve, and the first valve spring abuts against the inner bent part of the rubber valve.

Optionally, according to the structure for improving the assisting effect of the vacuum booster, a second return plate is further disposed on a side wall of the boosting push rod, the first return plate is located between the second return plate and the sealing disc, and a second valve spring is disposed between the rubber valve and the second return plate.

Optionally, according to the structure for improving the boosting effect of the vacuum booster, the sealing disc is in clearance fit with the push rod, sealing rings are arranged on the inner side and the outer side of the sealing disc, and the two sealing rings are respectively attached to the side wall of the push rod and the inner side wall of the joint of the transition cavity and the compression cavity.

Optionally, according to the structure for improving the boosting effect of the vacuum booster, a feedback cavity is arranged in the valve body, one end of the main cylinder push rod and one end of the air valve seat are both arranged in the feedback cavity, the other end of the main cylinder push rod penetrates through the valve body and extends into the vacuum cavity, and the other end of the air valve seat penetrates through the valve body and is matched with the boosting push rod.

Optionally, according to the structure for improving the assistance effect of the vacuum booster, a feedback disc is further disposed at one end, facing the air valve seat, of the push rod of the main cylinder, and the feedback disc abuts against the air valve seat.

Optionally, according to the structure for improving the assisting effect of the vacuum booster, a valve body sealing plate is further arranged on the outer side surface of the valve body and abuts against the rubber valve, a transition sealing plate extending to the joint of the valve body and the diaphragm is arranged on the outer side surface, close to the valve body sealing plate, of the transition cavity, the side surface of the transition sealing plate and the side surface of the valve body sealing plate are connected with each other to form a vent pipe, and a gas release hole for communicating the vent pipe with the vacuum cavity is formed in the end surface of the valve body;

when the push rod returns, the first valve spring pulls the rubber valve and the rubber valve towards the direction of the return plate, so that the rubber valve is separated from the valve body sealing plate, and the high-pressure cavity is communicated with the vacuum cavity through the vent pipeline and the air leakage hole.

The structure for improving the power assisting effect of the vacuum booster disclosed by the invention can be used for increasing the pressure difference between two sides of the diaphragm of the vacuum booster under the condition that a vacuum source is limited, namely the vacuum degree is lower, so that the safety of a vehicle is improved, and the period and the cost for independently developing special vacuum pumping components such as an electric vacuum pump and the like are saved. Atmospheric pressure enters the compressed gas cavity through the gap between the compression cavity shell and the push rod, and enters the cavity in a one-way mode through the piston, and cannot flow out reversely. Then when brake, promote the push rod and drive the piston and move forward, return spring force is greater than the atmospheric pressure of compressed gas intracavity this moment, and sealed dish is sealed with the compression chamber casing, and gas is compressed gradually, and when gas compression reached certain pressure, sealed dish was pushed open this moment, and the gas after the compressed gets into the transition chamber by the compression chamber, and high-pressure gas in the transition chamber is in getting into vacuum booster, realizes the higher pressure differential in vacuum booster diaphragm both ends, realizes higher helping hand effect.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic diagram of a structure for enhancing the boosting effect of a vacuum booster according to the present invention;

FIG. 2 is a schematic diagram of a compression chamber according to the present disclosure;

fig. 3 is a schematic structural diagram of a transition chamber and a high pressure chamber disclosed in the present invention.

Description of reference numerals: 1-a compression chamber; 2-a transition chamber; 3-high pressure chamber; 4-vacuum chamber; 5-a membrane; 6-a power-assisted push rod; 7-a piston; 8-sealing disc; 9-a first return plate; 10-a return spring; 11-a first valve spring; 12-a second valve spring; 13-a rubber valve; 14-a rubber valve; 15-valve body sealing plate; 16-an air duct; 17-air escape holes; 18-master cylinder push rod; 19-a feedback disc; 20-air valve seat; 21-a push plate; 22-a second return plate; 23-valve body.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

According to the drawings 1 to 3, the invention provides a structure for improving the boosting effect of a vacuum booster, which comprises a boosting push rod 6, a compression cavity 1, a transition cavity 2, a high-pressure cavity 3 and a vacuum cavity 4 which are sequentially connected, wherein the boosting push rod 6 is arranged inside the compression cavity 1 and the transition cavity 2.

A piston 7, a sealing disc 8 and a first return plate 9 are arranged on the side wall of the power-assisted push rod 6, the piston 7 is positioned in the compression cavity 1, the first return plate 9 is positioned in the transition cavity 2, and the sealing disc 8 can isolate the transition cavity 2 from the compression cavity 1; a return spring 10 is arranged between the first return plate 9 and the sealing plate 8.

The high-pressure cavity 3 and the vacuum cavity 4 are separated by a diaphragm 5, a valve body 23 is arranged in the middle of the diaphragm 5, a main cylinder push rod 18 is arranged in the valve body 23, an air valve seat 20 is arranged at one end, facing the transition cavity 2, of the main cylinder push rod 18, a groove is formed in the end portion of the air valve seat 20, and the power-assisted push rod 6 is matched with the groove, so that the power-assisted push rod 6 drives the main cylinder push rod 18 to move; a rubber valve 13 is arranged at one end of the transition cavity 2 close to the vacuum cavity 4, a first valve spring 11 is arranged between the rubber valve 13 and the first return plate 9, an annular rubber valve 14 is arranged between the rubber valve 13 and the valve body 23, a push plate 21 is further arranged at the end part of the air valve seat 20, the push plate 21 abuts against the rubber valve 14 and separates the transition cavity 2 from the high-pressure cavity 3, and a push distance is arranged between the push plate 21 and the valve body 23; when the boosting push rod 6 drives the main cylinder push rod 18 to move, the air valve seat 20 moves, the push plate 21 is far away from the rubber valve 14 below, and the transition cavity 2 is communicated with the high-pressure cavity 3, so that the boosting effect is realized.

When the device is implemented, atmospheric pressure enters the compression cavity 1 through the gap between the shell of the compression cavity 1 and the push rod, and enters the cavity in a one-way mode through the piston 7, so that the atmospheric pressure cannot flow out reversely. Then when the brake, the push rod is promoted to drive the piston 7 to move forward, the 10 power of return spring is greater than the atmospheric pressure in the compression chamber 1 this moment, seal dish 8 and the 1 casing seal in compression chamber, gas is continuously compressed in the compression chamber 1, when gas compression reaches certain pressure (set up to 1.2-1.5 atmospheric pressure), seal dish 8 is pushed open this moment, gas gets into transition chamber 2 by compression chamber 1, high-pressure gas in the transition chamber 2 is in getting into vacuum booster, realize the higher pressure differential in 5 both ends of vacuum booster diaphragm, realize higher helping hand effect.

Furthermore, the middle part of the rubber valve 13 is provided with an inward-contracting inclined frustum, and the first valve spring 11 is abutted against the inner bending part of the rubber valve 13. When compressed gas enters the transition cavity 2 from the compression cavity 1, the inner side of the rubber valve 13 is pushed by the compressed gas towards the direction of the air valve seat 20, so that the rubber valve 14 is in close contact with the push plate 21, and the sealing performance is improved.

Still further, a second return plate 22 is arranged on the side wall of the power push rod 6, the first return plate 9 is located between the second return plate 22 and the sealing disc 8, and a second valve spring 12 is arranged between the rubber valve 14 and the second return plate 22. The rubber valve 13 and the rubber valve 14 are provided with larger limiting elastic force through the first valve spring 11 and the second valve spring 12, so that when the push rod pushes the air valve seat 20 to move, the rubber valve 13 is still contacted with the push plate 21 under the action of compressed gas, and the compressed gas cannot enter the high-pressure cavity 3.

Further, sealed dish 8 and push rod clearance fit, and sealed dish 8 inboard all is equipped with the sealing ring with the outside, two sealing rings respectively with the lateral wall of push rod and transition chamber 2 and compression chamber 1's junction inside wall laminating. The sealing performance of the sealing disc 8 is improved, when the push rod returns, an extra spring is arranged on one side of the push rod 18 of the main cylinder, the spring with the return function is arranged on the pedal, and after the brake is released, the push rod returns to the pedal, so that the sealing disc 8 separates the compression cavity 1 from the transition cavity 2 again.

Further, a feedback cavity is arranged in the valve body 23, one end of the main cylinder push rod 18 and one end of the air valve seat 20 are both arranged in the feedback cavity, the other end of the main cylinder push rod 18 penetrates through the valve body 23 and extends into the vacuum cavity 4, and the other end of the air valve seat 20 penetrates through the valve body 23 and is matched with the power-assisted push rod 6.

Still further, a feedback disc 19 is further disposed at an end of the master cylinder push rod 18 facing the air valve seat 20, and the feedback disc 19 abuts against the air valve seat 20. The servo force generated by the pressure difference is transmitted to the master cylinder push rod 18 by the diaphragm 5 and the valve body 23 acting on the feedback disk 19. At this time, the pressure applied to the inner ring of the feedback disk 19 is larger than the pressure applied to the outer ring of the feedback disk 19 by the servo force.

Further, a valve body sealing plate 15 is further arranged on the outer side face of the valve body 23, the valve body sealing plate 15 abuts against the rubber valve 14, a transition sealing plate extending to the joint of the valve body 23 and the diaphragm 5 is arranged on the outer side face, close to the valve body sealing plate 15, of the transition cavity 2, the side face of the transition sealing plate and the side face of the valve body sealing plate 15 are connected with each other to form a vent pipeline 16, and a gas release hole 17 communicating the vent pipeline 16 with the vacuum cavity 4 is formed in the end face of the valve body 23. When the booster is in a non-working state, the vacuum cavity 4 is separated from the transition cavity 2 by the diaphragm 5 and the feedback disc 19, and the only passage of the diaphragm and the feedback disc is that the opening between the valve body sealing plate 15 and the rubber valve 14 is a vacuum valve port. The clearance of the vacuum valve port can be positive or negative depending on the product design requirements. When the gap between the vacuum valve ports is a positive value, the vacuum cavity 4 and the high-pressure cavity 3 are normally open; when the value is negative, the two are separated under the condition of no vacuum. The size of the gap of the vacuum valve port directly influences the invalid stroke, namely the idle stroke of the booster, and the larger the gap of the vacuum valve port is, the larger the idle stroke is, and the smaller the gap of the vacuum valve port is, otherwise, the larger the idle stroke is. The front housing part, the valve body 23, the air valve seat 20 and the rear housing rivet part are positioned in a balanced state with respect to each other by the resistance of the return spring 10. The air valve seat 20 and the rubber valve 14 are in a sealing state under the action of the valve spring, the gap between the air valve seat and the rubber valve is an atmospheric valve port, at this time, compressed air does not enter the high-pressure cavity 3, all parts of the booster are in a balance state of internal force, and the pressure in the vacuum cavity 4 is equal to that in the high-pressure cavity 3.

When the push rod returns, the first valve spring 11 pulls the rubber valve 13 and the rubber valve 14 toward the return plate, so that the rubber valve 14 is separated from the valve body sealing plate 15, and the high-pressure chamber 3 is communicated with the vacuum chamber 4 through the vent pipe 16 and the air release hole 17. When the brake is released, under the action of the reaction force of the feedback disc 19 and the action of the return spring 10, the main cylinder push rod 18 drives the air valve seat 20 to retreat, the air valve seat 20 compresses the rubber valve 14 to close the atmospheric valve port, the rubber valve 14 is separated from the valve body sealing plate 15 to open the vacuum valve port, the high-pressure cavity 3 of the booster is communicated with the vacuum cavity 4, and at the moment, the booster reaches the maximum boosting point during the return stroke. After the high-pressure gas enters the vacuum cavity 4, the air pressure in the compression cavity 1 is reduced, the force of the return spring 10 is larger than the air pressure in the compression cavity 1, the sealing disc 8 returns, and the atmosphere enters the compression cavity 1 again to realize the reciprocating circulation.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (7)

1. A structure for improving the power assisting effect of a vacuum booster is characterized by comprising a power assisting push rod, a compression cavity, a transition cavity, a high pressure cavity and a vacuum cavity which are sequentially connected, wherein the power assisting push rod is arranged in the compression cavity and the transition cavity;

a piston, a sealing disc and a first return plate are arranged on the side wall of the power-assisted push rod, the piston is located in the compression cavity, the first return plate is located in the transition cavity, and the sealing disc can isolate the transition cavity from the sealing cavity; a return spring is arranged between the first return plate and the sealing disc;

the high-pressure cavity and the vacuum cavity are separated by a diaphragm, a valve body is arranged in the middle of the diaphragm, a main cylinder push rod is arranged in the valve body, an air valve seat is arranged at one end, facing the transition cavity, of the main cylinder push rod, a groove is formed in the end portion of the air valve seat, and the power-assisted push rod is matched with the groove so as to drive the main cylinder push rod to move; a rubber valve is arranged at one end, close to the vacuum cavity, of the transition cavity, a first valve spring is arranged between the rubber valve and the first return plate, an annular rubber valve is arranged between the rubber valve and the valve body, a pushing plate is further arranged at the end part of the air valve seat, the pushing plate abuts against the rubber valve and separates the transition cavity from the high-pressure cavity, and a pushing distance is arranged between the pushing plate and the valve body; when the boosting push rod drives the main cylinder push rod to move, the air valve seat moves, the rubber valve below the pushing plate is far away from the pushing plate, and the transition cavity is communicated with the high-pressure cavity so as to achieve the boosting effect.

2. A structure for improving the assisting effect of a vacuum booster as set forth in claim 1, wherein an inclined frustum which is inwardly contracted is provided at a middle portion of the rubber valve, and the first valve spring abuts against an inner bent portion of the rubber valve.

3. A structure for improving the boosting effect of a vacuum booster as set forth in claim 2, wherein a second return plate is further provided on the side wall of the boosting push rod, the first return plate is located between the second return plate and the sealing plate, and a second valve spring is provided between the rubber valve and the second return plate.

4. A structure for improving the boosting effect of a vacuum booster as claimed in claim 1, wherein the sealing disc is in clearance fit with the push rod, sealing rings are arranged on the inner side and the outer side of the sealing disc, and the two sealing rings are respectively attached to the side wall of the push rod and the inner side wall of the joint of the transition cavity and the compression cavity.

5. A structure for improving the assisting effect of a vacuum booster as recited in claim 1, wherein a feedback chamber is provided in the valve body, one end of the main cylinder push rod and one end of the air valve seat are both provided in the feedback chamber, the other end of the main cylinder push rod passes through the valve body and extends into the vacuum chamber, and the other end of the air valve seat passes through the valve body and is matched with the assisting push rod.

6. A structure for improving the boosting effect of a vacuum booster as recited in claim 4, wherein a feedback disk is further disposed at an end of the push rod of the main cylinder facing the air valve seat, and the feedback disk abuts against the air valve seat.

7. The structure for improving the boosting effect of a vacuum booster according to claim 1, wherein a valve body sealing plate is further arranged on the outer side surface of the valve body, the valve body sealing plate abuts against the rubber valve, a transition sealing plate extending to the joint of the valve body and the diaphragm is arranged on the outer side surface of the transition cavity close to the valve body sealing plate, the side surface of the transition sealing plate and the side surface of the valve body sealing plate are connected with each other to form a vent pipe, and a gas release hole for communicating the vent pipe with the vacuum cavity is formed in the end surface of the valve body;

when the push rod returns, the first valve spring pulls the rubber valve and the rubber valve towards the direction of the return plate, so that the rubber valve is separated from the valve body sealing plate, and the high-pressure cavity is communicated with the vacuum cavity through the vent pipeline and the air leakage hole.

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