Control valve assembly and vacuum booster using same

Abstract

The utility model provides a control valve assembly and a vacuum booster using the control valve assembly. The control valve assembly comprises a valve body, a valve rod and a valve rod, the first valve and the second valve are arranged in the valve body and can be relatively contacted and separated; the first channel is opened and closed by the first valve; the second channel is opened and closed by the second valve; the third channel is always communicated with the first channel; the small chamber is communicated with the third channel, one end of the connecting piece is connected to the inner wall of the valve body, the other end of the connecting piece is combined with the first valve, and the small chamber is defined by the first valve. According to the utility model, not only can quick braking be realized, so that a driver can obtain a good braking feeling, but also noise generated in a braking return process can be reduced, and better comfortable sensation and safety sensation are brought to the driver.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile, especially the brake control of automobile, especially relates to the vacuum booster used in the brake control of automobile and the control valve assembly used in the vacuum booster. BACKGROUND

[0002] Vacuum booster (Vacuum Booster) as a kind of component that can increase the force exerted on brake pedal by the pressure difference between vacuum (negative pressure) and atmospheric pressure to assist the driver to brake is applied in the field of automobile, especially widely used in the brake system field of automobile, it is one of the most critical components in automobile brake system.

[0003] In actual application, vacuum booster is usually installed between brake pedal and brake master cylinder, vacuum is generated in the interior of vacuum booster by the one-way valve provided on one side through vacuum pump or the suction action of engine when working, vacuum side and atmospheric side (air side) connected with external normal atmosphere are formed in the interior of vacuum booster by the cavity structure separated by diaphragm and the action of control valve, the brake effect is strengthened by the pressure difference between vacuum side in the interior of vacuum booster and normal atmospheric side on the other side of vacuum booster, to assist the driver to brake, so that the driver can save more effort when stepping on brake pedal, to ensure that brake fluid in brake master cylinder can flow into brake wheel cylinder at specified pressure to realize brake, so that the driver can safely and quickly implement the brake of automobile.

[0004] As the existing vacuum booster for automobile brake, for example, it usually includes the following main components: shell composed of front shell and rear shell, control valve assembly, diaphragm and its diaphragm seat capable of separating the interior space of vacuum booster, rubber reaction disc, control valve push rod (brake pedal push rod), brake master cylinder push rod, limiting piece, spring components such as vacuum channel, atmospheric channel, return spring and air filter element.

[0005] Diaphragm divides vacuum booster into two cavities, front cavity and rear cavity, wherein, front cavity is connected with vacuum source and can be vacuumized. In addition, front cavity can also communicate with rear cavity through vacuum channel, rear cavity can also communicate with atmosphere through atmospheric channel, rear cavity can be controlled to switch between vacuum and atmosphere, for example, by the control of control valve assembly, the opening and closing of vacuum channel and atmospheric channel are realized, so that the interior of rear cavity can be selectively communicated with atmospheric side or vacuum side, the switching between vacuum and atmosphere is realized, to form pressure difference between front cavity and rear cavity when the driver steps on brake pedal to realize the brake assistance. The utility model discloses

[0006] The utility model wants to solve the technical problem

[0007] However, with the rapid development of vehicle technology and the improvement of living standards, the focus of consumers has not only limited to the performance of the car, and the comfort and safety of the car has gradually become one of the concerns of consumers. For example, in order to obtain good braking feeling and considering the safety of driving, the driver is required to quickly return (restore to the initial state) the brake pedal when releasing the brake pedal. At this time, the vacuum booster needs to have high resilience, but such setting not only brings good braking feeling, but also brings negative effects, for example, when making the brake pedal quickly return to the initial position, the internal components of the vacuum booster, such as the limiting piece and the valve body or the shell, will produce a larger collision and make noise. For example, when releasing the brake pedal, the vacuum booster ends the assistance, the brake system starts to cancel the brake, and the internal components of the vacuum booster (such as the valve body of the control valve assembly) start to return, and in the return process, the internal components of the valve body, the limiting piece, the shell and the like may collide and produce noise, especially if the speed of the components is too fast in order to obtain more sensitive and fast braking feeling, the collision and noise will become more obvious, which not only affects the subjective feeling (such as foot feeling) of the driver when implementing the brake and reduces the comfort of the driver, but also the collision and noise will distract the driver and affect the safety of the driver, and the impact sound may be judged by the driver as the abnormal sound of the car and affect the quality of the product, especially as the consumers pay more and more attention to NVH (Noise, Vibration, Harshness (Noise, Vibration, Harshness)), automobile manufacturers also pay more and more attention to the improvement related to NVH. Therefore, how to improve the NVH problem of the vehicle under the premise of being able to safely realize good driving feeling has become an important issue at this stage.

[0008] The utility model discloses

[0009] Technical means for solving the problem

[0010] The first aspect of the utility model provides a control valve assembly, include: valve body, set up in the valve body can be relative contact separation first valve and second valve, by the first valve open and close first passageway, by the second valve open and close second passageway, always with first passageway communication third passageway, with third passageway communication small room, wherein, the small room by one end is connected to the inner wall of valve body and the other end is combined with first valve connecting piece and first valve is surrounded.

[0011] In the control valve assembly of the utility model, the connecting piece is combined with the first valve through the clamping structure or the hooking structure.

[0012] In the control valve assembly of the utility model, the first passageway has a first opening, the first valve can open and close the first opening, the third passageway has a small room passageway opening, and the small room is communicated with the first passageway through the small room passageway opening and the third passageway.

[0013] In the control valve assembly of the utility model, the connecting piece is rubber.

[0014] The second aspect of the utility model provides a vacuum booster, with the control valve assembly of any one aspect described above.

[0015] In the vacuum booster of the utility model, preferably further have: the diaphragm that the space in the casing of vacuum booster is divided into front chamber and rear chamber, the first valve is vacuum valve, the second valve is atmospheric valve, the first passageway is the vacuum passageway that communicates with the front chamber, the second passageway is the atmospheric passageway that communicates with the rear chamber, the third passageway is the small room passageway that communicates the small room and the first passageway.

[0016] In the vacuum booster of the utility model, preferably the front chamber is connected with the vacuum source that can be evacuated, the vacuum valve and the atmospheric valve can be relative contact separation, in the state of opening the vacuum source, when the vacuum valve opens the vacuum passageway and the atmospheric valve closes the atmospheric passageway, the front chamber, the rear chamber and the small room are communicated and are evacuated into vacuum state;When the vacuum valve closes the vacuum passageway and the atmospheric valve opens the atmospheric passageway, the front chamber and the small room are communicated and are evacuated into vacuum state, the rear chamber is communicated with atmosphere and becomes atmospheric state, and the pressure difference is generated between the front chamber and the rear chamber.

[0017] In the vacuum booster of the utility model, preferably the small room is arranged next to the vacuum valve and is located on the side away from the front chamber relative to vacuum valve.

[0018] Utility model effect

[0019] According to the utility model, the control valve assembly and the vacuum booster using the same can not only realize rapid braking to enable the driver to obtain good braking feeling, but also can reduce the noise generated in braking return, and bring better comfort and safety to the driver. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the three-dimensional schematic view of the vacuum booster of one embodiment of the utility model;

[0021] Figure 2 is the partial structure schematic view of the inside of the vacuum booster of one embodiment of the utility model;

[0022] Figure 3 (A) in (B) is the sectional view of the valve body in the control valve assembly of the vacuum booster of one embodiment of the utility model, Figure 3 (B) is Figure 3 the sectional view of the N-N section along the center line L of (A).

[0023] REFERENCE NUMERALS

[0024] A: vacuum booster

[0025] B: brake pedal assembly

[0026] C: brake master cylinder (part)

[0027] S: control valve assembly

[0028] 1: housing

[0029] 1a: front housing

[0030] 1b: rear housing

[0031] 2: front chamber (first chamber)

[0032] 3: rear chamber (second chamber)

[0033] 4: diaphragm

[0034] 5: valve body

[0035] 6: vacuum valve (first valve)

[0036] 7: atmosphere valve (air valve / second valve)

[0037] 8: vacuum passage (first passage)

[0038] 9: atmosphere passage (ventilation passage / second passage)

[0039] 10: chamber passage (third passage)

[0040] 11: connecting piece (chamber forming piece)

[0041] 12: chamber (third chamber)

[0042] 13: vacuum passage opening

[0043] 14: chamber passage opening

[0044] 15: control valve push rod

[0045] 16: brake master cylinder push rod

[0046] 17: rubber reaction disc

[0047] 18: stopper

[0048] 19: diaphragm return spring

[0049] 20: control valve push rod return spring

[0050] 21: diaphragm seat

[0051] 22: pedal (brake pedal)

[0052] L: center line of valve body

[0053] It should be understood that the elements shown in the drawings are not necessarily drawn to scale, and that the embodiments of the application can be used in other, different environments and / or employed to achieve different, but beneficial results.

[0054] For example, the dimensions of some of the elements can be exaggerated relative to other elements for clarity. Further, like elements are denoted with like reference numerals throughout the

[0055] drawings. It should be understood that the drawings are not necessarily to scale, and that in certain instances, various embodiments can have different relative dimensions than those depicted in the drawings.

[0056] It is to be further understood that, because some of the constituent elements of some of the

[0057] various embodiments depicted herein are known, only the unique aspects of the application are DETAILED DESCRIPTION

[0058] The present application will now be described in detail with reference to the drawings. It should be understood that the various embodiments described herein are only examples of the complete description and are not intended to limit the scope of the present application. Based on the specific embodiments and examples of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0059] In the following description, numerous specific details are set forth. However, embodiments, described herein, can be practiced without the specific details. In an effort to avoid obscuring the description, some well-known structures and devices are not shown in detail.

[0060] It should be understood that the ordinal adjectives such as "first", "second", "third", etc. used in describing the elements or components herein do not by their very nature dictate or imply these elements or components must be in a given order, unless specifically stated otherwise or otherwise understood as such by persons of ordinary skill in the art.

[0061] In addition, for ease of description, the following description uses "upper", "lower", "left", "right", "horizontal", "vertical", "front", "back", "top", "bottom", "inner", "outer", and the like to indicate the orientation of the components, but only limits the relative positional relationship between the components in a certain attitude shown in the drawings, and the use of these words does not limit the components, and if the specific attitude changes, the orientation-indicating words will also change accordingly.

[0062] In the present application, except otherwise stated, the terms "connection", "fixing" and the like should be understood in a broad sense, such as, without special instructions, for example, "fixing" can be fixed connection or detachable connection, or formed as a whole; "connection" can be mechanical connection or electrical connection, can be directly connected or indirectly connected through intermediate medium. In addition, the "up-down direction", "front-rear direction", "left-right direction", "width direction", "length direction", "parallel", "perpendicular", "vertical" of the present application are not limited to the strict geometric direction (vertical up-down (plumb up-down) and front-back-left-right, parallel, perpendicular), for example, it also includes the case of slightly inclined at a certain angle relative to the above direction. The description of the direction is only for easy understanding, and the structure in each figure does not necessarily meet the corresponding requirements of the direction.

[0063] In addition, it should also be understood that the word "about" or "approximately" can be used herein to modify a numerical value, which means within the normal tolerance range in the art.

[0064] In addition, the contents shown in the drawings are all schematic, and do not represent the actual structure of the product, in order to facilitate explanation and understanding, the proportions of the components are not necessarily consistent with the actual product.

[0065] In addition, the "vacuum state", "vacuuming", and the like mentioned in the following description do not mean that a vacuum must be formed to 100%, but also include a case where a vacuum is formed to an extent that a predetermined vacuum degree is satisfied, for example. Also, the "atmospheric state", "return to the atmosphere", and the like mentioned in the following description do not mean that the pressure must be equal to the atmospheric pressure to 100%, but also include a case where the pressure is equal to or lower than the atmospheric pressure to an extent that a predetermined vacuum degree is satisfied, for example.

[0066] In addition, in the present application, in order to facilitate the description, the left side in the drawing is the front or forward direction (for example, refer to the direction in which the control valve push rod 15 moves when the pedal 22 is depressed), and the right side in the drawing is the rear or backward direction or the return direction (for example, refer to the direction in which the control valve push rod 15 moves when the pedal is released). Figure 1 and Figure 2 , the control valve push rod 15 moves in the direction of the left side in the drawing when the pedal 22 is depressed), and the right side in the drawing is the rear or backward direction or the return direction (for example, refer to the direction in which the control valve push rod 15 moves when the pedal is released). Figure 1 and Figure 2 , the control valve push rod 15 moves in the direction of the left side in the drawing when the pedal 22 is depressed), and the right side in the drawing is the rear or backward direction or the return direction (for example, refer to the direction in which the control valve push rod 15 moves when the pedal is released).

[0067] Next, the vacuum booster of the present application and the control valve assembly used therein will be described in detail.

[0068] As shown in Figure 1 , the vacuum booster A of the present application is installed between the brake pedal assembly B and the brake master cylinder C, and has a housing 1 formed of a front housing la and a rear housing lb, and components such as a control valve assembly described later are provided inside the housing 1. A vacuum check valve, not shown, which is connected to the intake manifold of the automobile engine or a vacuum pump as a vacuum source, is provided on the side of the front housing la of the vacuum booster A, and in the present application, a case where the vacuum check valve of the vacuum booster A is connected to the intake manifold of the automobile engine is described as an example, but the present application is not limited thereto, and a vacuum pump can be provided as a vacuum source and connected thereto.

[0069] In the present application, when the automobile engine is started, the inside of the vacuum booster A is evacuated by the action of the automobile engine via the vacuum check valve connected to the intake manifold of the automobile engine, so that a vacuum is formed in the inside of the vacuum booster A.

[0070] Figure 2 is a schematic view of a partial structure of the inside of the vacuum booster of one embodiment of the present application, in which Figure 2 the state shown in Figure 2 is a case where the vacuum valve 6 has been closed and is in abutment with the atmospheric valve 7, and in order to facilitate the description, only a partial structure of the inside of the vacuum booster is shown in Figure 2The front housing 1a is not shown, and the structure of components such as the front chamber 2, the diaphragm 4, the diaphragm seat 21, the control valve push rod 15, the brake master cylinder push rod 16, etc. is not completely shown either, but only a partial portion of these components is shown, which can be understood by those skilled in the art. In addition, in the present utility model, the valve body is sometimes used as a diaphragm seat.

[0071] With reference to Figure 1 and Figure 2 , the vacuum booster A of the present utility model is provided with a control valve assembly S in the housing 1 formed by the front housing 1a and the rear housing 1b. The control valve assembly S mainly includes: a valve body 5, a vacuum valve 6 (in the present specification, it is also sometimes referred to as "first valve"), an atmospheric valve 7 (it is also sometimes referred to as "air valve" or "second valve"), a vacuum passage 8 (it is also sometimes referred to as "first passage"), an atmospheric passage 9 (it is also sometimes referred to as "ventilation passage" or "second passage"), a chamber passage 10 (it is also sometimes referred to as "third passage"), a connecting piece 11, a chamber 12, a vacuum passage opening 13, a chamber passage opening 14, and components such as a gasket and a valve seat.

[0072] As shown in Figure 2 and Figure 3 , the valve body 5 of the present utility model is assembled in the housing 1, and as a specific example of the valve body 5, for example, it is provided with a cylindrical shape with a cross section substantially circular perpendicular to the center line L of the valve body 5, and the diameter is larger closer to the front housing 1a side (left side in the figure, i.e. the side where the brake master cylinder C is located), with a profile substantially in the shape of a step (refer to Figure 3 ).

[0073] Next, with reference to Figure 2 , the vacuum valve 6 and the atmospheric valve 7 are assembled in the valve body 5 in a manner capable of relative movement (specifically, the vacuum valve 6 and the atmospheric valve 7 are assembled in the valve body 5 in a manner capable of relative contact separation or simultaneous movement), and the atmospheric valve 7 is closer to the front housing 1a side (left side in the figure, i.e. the side where the brake master cylinder C is located) than the vacuum valve 6. One end (right end in the figure) of the control valve push rod 15 is connected to the brake pedal assembly B and can move forward (toward the left side in the figure) as the brake pedal 22 is depressed, and the other end of the control valve push rod 15 is fixedly installed to the atmospheric valve 7 and can push it to move forward and backward as the pedal 22 is depressed. The atmospheric valve 7 can make the other end thereof abut against the rubber reaction disc 17 fixed to the valve body 5 by being pushed forward by the control valve push rod 15. In addition, the brake master cylinder push rod 16 is also installed on the surface of the rubber reaction disc 17 opposite to the surface capable of abutting against the atmospheric valve 7, and the brake master cylinder push rod 16 is connected to the brake master cylinder C and can make the brake fluid in the brake master cylinder C flow into the brake wheel cylinder at a prescribed pressure to achieve braking by pushing the piston in the brake master cylinder C.

[0074] Next, referring to Figure 2 and Figure 3 The utility model is further described. As shown in Figure 2 The diaphragm 4 separates the space in the housing 1 into a front chamber (first chamber) 2 and a rear chamber (second chamber) 3. In practical applications, the front chamber 2 is always in a vacuum state by being evacuated via a vacuum one-way valve, so it is also sometimes referred to as a vacuum chamber or constant pressure chamber.

[0075] In addition, a vacuum passage 8 (first passage) is also provided on the valve body 5 between the front chamber 2 and the rear chamber 3, one end of the vacuum passage 8 is communicated with the front chamber 2, the other end has a vacuum passage opening 13 that opens into the rear chamber 3, and the vacuum valve 6 can open and close the vacuum passage opening 13. Specifically, when the vacuum valve 6 is opened, the vacuum passage opening 13 is also opened, and the front chamber 2 and the rear chamber 3 are communicated; when the vacuum valve 6 is closed, the vacuum passage opening 13 is also closed, and the front chamber 2 and the rear chamber 3 are separated.

[0076] In addition, an atmospheric passage 9 (air passage / second passage) is also provided on the valve body 5, and the atmospheric passage 9 can be in an open state or a closed state by opening and closing of the atmospheric valve 7. Specifically, when the atmospheric valve 7 is opened, the atmospheric passage 9 is communicated with the atmosphere, and air can enter the rear chamber 3; when the atmospheric valve 7 is closed, the atmospheric passage 9 is separated from the atmosphere, and air cannot enter the rear chamber 3.

[0077] In practical applications, when the car is started and the driver does not apply the brake to the brake pedal (hereinafter referred to as "initial stage" or "non-working state"), the atmospheric valve 7 and the vacuum valve 6 abut each other, the atmospheric valve 7 is in a closed state and the vacuum valve 6 is in an open state, the vacuum passage opening 13 is also in an open state, the front chamber 2 and the rear chamber 3 are communicated, and the front chamber 2 is evacuated and in a vacuum state. Because the atmospheric valve 7 is in a closed state at this time, the atmospheric passage 9 is also in a closed state, so the rear chamber 3 is separated from the atmosphere, but because the rear chamber 3 is connected to the front chamber 2 through the vacuum passage 8 and the front chamber 2 is in a vacuum state by being evacuated, the rear chamber 3 is also in a vacuum state. That is, in the initial state of starting the car, when the atmospheric valve 7 is closed and the vacuum valve 6 is opened, the front chamber 2 and the rear chamber 3 are communicated with each other and are in a vacuum state.

[0078] Further, when the driver steps on the pedal 22 to apply a brake force to open the atmospheric valve 7 and close the vacuum valve 6 (hereinafter referred to as "braking phase" or "boost phase"), because the vacuum valve 6 is closed, the vacuum passage opening 13 is also closed, and the communication between the front chamber 2 and the rear chamber 3 is blocked, although the front chamber 2 is vacuumized and remains in a vacuum state, because the atmospheric passage 9 is in an open state and the communication between the front chamber 2 and the rear chamber 3 is blocked, the rear chamber 3 is in an atmospheric state. That is, in the state of starting the vehicle, when the driver steps on the pedal 22 to apply a brake force to open the atmospheric valve 7 and close the vacuum valve 6, the communication between the front chamber 2 and the rear chamber 3 is blocked, the front chamber 2 remains in a vacuum state, and the rear chamber 3 becomes an atmospheric state due to the opening of the atmospheric passage 9. Thus, a pressure difference is created between the front chamber 2 and the rear chamber 3, so that the pressure of the rear chamber 3 (atmospheric pressure) is much greater than the pressure in the front chamber 2 (close to vacuum), thereby enabling the pressure difference to apply a force to the diaphragm 4 to push it forward, so as to drive the brake master cylinder push rod to advance to achieve the boost of braking. Here, because the pressure of the rear chamber 3 can be changed with the opening and closing of the valves, sometimes the part where the pressure of the rear chamber 3 can be changed is also referred to as a variable pressure chamber (when the driver brakes, atmospheric air will flow into the variable pressure chamber, and when the driver releases the brake, the air in the variable pressure chamber will be sucked out to the constant pressure chamber to restore to a vacuum state), and the part that is always in an atmospheric environment is referred to as an atmospheric chamber or atmospheric environment (the part is always in an atmospheric environment).

[0079] Further, in actual application, when the force balance between the stepping force, the elastic force of each elastic member and spring, and the atmospheric pressure is achieved, the atmospheric valve 7 and the vacuum valve 6 are both in a closed state (hereinafter referred to as "holding phase" or "braking maintaining phase"), so that the specified braking condition can be maintained at all times (for example, the driver steps on the pedal at this time but does not further apply a force).

[0080] Further, in actual application, when the driver releases the brake pedal to cancel the application of force to the brake pedal (hereinafter referred to as "return phase" or "restoring phase" or "braking release phase"), the force balance between the components is broken, the diaphragm return spring 19 arranged between the front housing 1a and the diaphragm 4 can push the diaphragm 4 back to make the diaphragm 4 and the valve body 5 as a whole retreat (for example, the diaphragm 4 is pushed by the diaphragm return spring 19), until it returns to the initial state.

[0081] Further, with reference to Figure 2The atmospheric valve 7 is further provided with a limiting piece 18, which abuts against the shell 1 or other components to limit the atmospheric valve 7 during braking, so that the atmospheric valve 7 is not excessively pushed towards the front shell 1a side, and is not excessively returned during the return stroke after braking, thereby enabling the atmospheric valve 7 to move forward and backward within a specified moving range. Here, the limiting piece 18 is preferably made of metal.

[0082] In addition, in the utility model, in order to be able to realize fast braking while reducing the noise generated during the return stroke of braking, the structure of the valve body 5 is designed. Specifically, referring to Figure 2 and Figure 3 The valve body 5 is further provided with a small chamber (third chamber) 12 and a small chamber channel 10 in communication with the vacuum channel 8, the small chamber 12 is surrounded by the vacuum valve 6 and the connecting piece 11 described below, and the small chamber channel 10 is formed with a small chamber channel opening 14 at one end, so that the small chamber 12 can always be in communication with the front chamber 2 through the small chamber channel 10 and the vacuum channel 8. In actual application, when the automobile engine starts, the small chamber 12 is also vacuumed as the front chamber 2 is vacuumed.

[0083] Specifically, in the utility model, the valve body 5 is designed to be provided with a small chamber 12 on the side (rear side) close to the brake pedal assembly B on the radial inner side (inner wall side) of the valve body 5, which can be surrounded by the vacuum valve 6 and the connecting piece 11 provided on the inner wall of the valve body 5. One end of the connecting piece 11 is fixed to the inner wall of the valve body 5 and the other end is connected to the radial inner side end of the vacuum valve 6. Referring to Figure 2 , preferably, the connecting piece 11 is elastic, for example, formed of rubber, and preferably, one end thereof is airtightly fixed to the inner wall of the valve body 5 and the other end is connected to the radial inner side end of the vacuum valve 6, thereby forming the small chamber 12 with an opening (small chamber channel opening 14) and always connected to the vacuum channel 8. In the utility model, the end of the connecting piece 11 away from the inner wall of the valve body can be connected to the radial inner side end of the vacuum valve 6 by clamping or hooking. In addition, the vacuum valve 6 of the utility model is also preferably made of elastic components such as rubber.

[0084] By the utility model, the small chamber 12 is provided on the side close to the brake pedal assembly B of the vacuum valve 6, so that the small chamber 12 is always connected to the front chamber 2, so that after the automobile starts, both are always in a vacuum state (i.e., in Figure 2The small chamber 12 is further provided on the right side (the rear side of the vacuum booster) of the vacuum valve 6. By arranging the small chamber 12, the valve body and other components can retreat at a faster speed in the early stage of the return stroke, and in the final stage of the return stroke, the speed of the return stroke is slow when approaching the position of the end of the return stroke (i.e. approaching the position of the initial stage), until the initial stage is returned. In other words, in the utility model, by arranging the small chamber 12 on the rear side of the vacuum valve 6, the return stroke can be performed at a faster early return stroke speed and a slower final return stroke speed to the position of the end of the return stroke, and the overall return stroke time is not changed, so that not only the fast brake can be realized to enable the driver to obtain a good brake feeling (the overall return stroke time is not changed), but also compared with the prior art, the components such as the limiting piece can contact the shell at a slow speed during the return stroke, so that the noise caused by the fast impact is avoided, the noise generated during the brake return stroke is reduced, the driver is not disturbed, the driver has a better comfort and safety feeling, the time of the brake release is not changed, the same brake response speed can be obtained compared with the prior art under the same pedal stroke, and the opening width of the valve can be increased.

[0085] Next, the working process of the utility model is specifically described.

[0086] Firstly, in the non-working state, i.e. the initial stage, although the engine of the automobile is started, the driver does not step on the brake pedal 22, so that the brake pedal 22 is not stressed at this time, the return spring 20 of the control valve push rod 15 pushes the control valve push rod 15 to the limit position of the right end in the Figure 2 , the vacuum valve 6 is in close contact with the atmosphere valve 7, the vacuum passage 8 is opened, the atmosphere passage 9 is closed, the front chamber 2 and the rear chamber 3 and the small chamber 12 are communicated to become a vacuum state.

[0087] Then, in the brake stage, when the driver steps on the brake pedal 22, the pressure of the brake pedal 22 is transmitted to the control valve push rod 15 to push the atmosphere valve 7 to the left side (the forward direction) in the Figure 2 , so that the atmosphere valve 7 is also pushed to the left side (the forward direction) in the Figure 2The valve moves to the left. As the atmospheric valve 7 moves, it further presses against the rubber reaction disc 17, compressing it. Then, the atmospheric valve 7 is further stressed, the vacuum valve 6 closes, the contact between the vacuum valve 6 and the atmospheric valve 7 is released, and the atmospheric valve 7 opens, allowing air to enter the rear chamber 3 (but because the vacuum valve 6 is closed, air will not enter the front chamber 2). This creates a pressure difference between the rear chamber 3 and the front chamber 2, activating the assist effect and generating servo force. This pressure difference applies force to the diaphragm 4, pushing it to move the valve body 5 and the brake master cylinder push rod 16 towards... Figure 2 The left side moves further and pushes the piston in the master cylinder C to make the brake fluid in the master cylinder C flow into the brake wheel cylinder at a specified pressure to achieve braking.

[0088] Then, during the holding phase, a force balance is achieved between the pedaling force, the elastic force of each elastic component and spring, and the atmospheric pressure. Atmospheric valve 7 and vacuum valve 6 are both in the closed state, which can always maintain the specified braking conditions.

[0089] Subsequently, during the brake release phase, when the driver releases the brake pedal, the brakes are released. Under the coordinated action of various springs and other components, the control valve push rod 15 moves backward (in the reversing direction), the vacuum valve 6 reopens, and the atmospheric valve 7 closes. The valve body 5 then moves backward, and the rear chamber 3 is evacuated again until the brakes are completely released and the vehicle returns to its initial state. During this phase, the presence of the small chamber 12 allows for a faster early return speed and a slower late return speed to the final position, without changing the overall return time.

[0090] The embodiments of this utility model have been described above. It should be understood that although this utility model has been described with reference to specific embodiments, those skilled in the art can modify one or more features after reading the specification without departing from the spirit and scope of this utility model. Therefore, this specification is not intended to limit this utility model. Rather, the scope of this utility model is defined only by the appended claims and their equivalents.

Claims

1. A control valve assembly characterized by, The control valve assembly according to any one of claims 1 to 4. Further comprising: a diaphragm that divides a space in a housing of the vacuum booster into a front chamber and a rear chamber, the first valve is a vacuum valve, and the second valve is an atmospheric valve, the first passage is a vacuum passage that communicates with the front chamber, the second passage is an atmospheric passage that communicates with the rear chamber, the third passage is a chamber passage that communicates the chamber and the first passage.

7. The vacuum booster according to claim 6, wherein: the front chamber is connected to a vacuum source that is capable of being evacuated, the vacuum valve and the atmospheric valve are capable of being brought into contact and separated from each other, in a state in which the vacuum source is opened, when the vacuum valve opens the vacuum passage and the atmospheric valve closes the atmospheric passage, the front chamber, the rear chamber, and the chamber are communicated with each other and are evacuated to a vacuum state, when the vacuum valve closes the vacuum passage and the atmospheric valve opens the atmospheric passage, the front chamber and the chamber are communicated with each other and are evacuated to a vacuum state, the rear chamber is communicated with the atmosphere and becomes an atmospheric state, and a pressure difference is generated between the front chamber and the rear chamber.

8. The vacuum booster according to claim 7, wherein: the chamber is disposed next to the vacuum valve and is located on a side away from the front chamber with respect to the vacuum valve.

5. A vacuum booster, characterized by ​ 6. The vacuum booster according to claim 5, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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