Automobile vacuum booster capable of adjusting vacuum boosting ratio

Abstract

The invention discloses an automobile vacuum booster capable of adjusting a vacuum boosting ratio, which relates to the technical field of automobile brake systems and comprises a shell, a diaphragm, a control chamber and a boosting ratio adjusting mechanism. An inner cavity of the shell is divided into a first chamber and a second chamber by the diaphragm; the control chamber is used for controlling the communication relation between the vacuum cavity and the atmosphere cavity. The assistance ratio adjusting mechanism is installed on one side of the diaphragm and comprises a supporting plate assembly and an adjusting assembly, the supporting plate assembly comprises a first-stage supporting plate, a second-stage supporting plate and a third-stage supporting plate, the adjusting assembly comprises a multi-stage air cylinder and an adjusting rod, the multiple stages of supporting plates are connected in a sliding mode, and the adjusting rod is connected with the first-stage air cylinder and the second-stage air cylinder. The supporting area of the supporting plate formed by the multiple stages of supporting plates is changed through the multiple stages of air cylinders, the supporting plate assembly supports the membrane, and therefore the effective area of the membrane is changed. The effective area of the diaphragm is changed through cooperation of the supporting plate assembly and the multi-stage air cylinder, and dynamic adjustment of the power assisting ratio is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive braking systems, and particularly to an automotive vacuum booster with adjustable vacuum assist ratio. Background Art

[0002] An automotive vacuum booster is an important component in an automotive braking system. Its function is to utilize the vacuum generated in the engine intake manifold to amplify the force of the driver stepping on the brake pedal through a diaphragm, thereby reducing the driver's braking operation intensity.

[0003] For a traditional vacuum booster, its assist ratio is fixed and cannot be adjusted according to different driving conditions and driver requirements. Therefore, an automotive vacuum booster with adjustable vacuum assist ratio is proposed. Summary of the Invention

[0004] The main object of the present invention is to provide an automotive vacuum booster with adjustable vacuum assist ratio, which can dynamically adjust the assist ratio by changing the effective area of the diaphragm, and can effectively solve the problems in the background art.

[0005] To achieve the above object, the present invention provides an automotive vacuum booster with adjustable vacuum assist ratio, including a housing, a diaphragm, a control chamber, and an assist ratio adjustment mechanism;

[0006] One side of the housing is provided with a vacuum source connector, and a check valve is arranged inside the vacuum source connector;

[0007] The diaphragm divides the inner cavity of the housing into a first chamber and a second chamber. A channel is arranged between the first chamber and the second chamber, and the second chamber is arranged close to the vacuum source connector;

[0008] The control chamber is arranged on one side of the first chamber away from the second chamber, and the control chamber is used to control the communication relationship between the vacuum chamber and the atmosphere chamber;

[0009] The boost ratio adjustment mechanism is installed on one side of the diaphragm. The boost ratio adjustment mechanism is located in the second chamber. The boost ratio adjustment mechanism includes a support plate assembly and an adjustment assembly. The support plate assembly includes a first-stage support plate, a second-stage support plate, and a third-stage support plate. The first-stage support plate is annular and fixedly installed on the inner wall of the housing. The second-stage support plate is a semi-circular arc plate, and there are two of them. The two second-stage support plates are symmetrically and slidably installed on the first-stage support plate respectively. The third-stage support plate is a semi-circular arc plate that is proportionally reduced from the second-stage support plate, and there are two of them. The two third-stage support plates are symmetrically and slidably installed on the second-stage support plate respectively. The adjustment assembly includes a multi-stage cylinder and an adjustment rod. The multi-stage cylinder is installed outside the housing. The output end of the multi-stage cylinder is connected to the adjustment rod. The adjustment rod passes through the housing and is connected to the third-stage support plate. There are two groups of the adjustment assembly, and the two adjustment rods are symmetrically connected to the two third-stage support plates.

[0010] Based on the above technical solutions, the present invention can be further improved as follows.

[0011] Further, an air filter, a valve piston, and a rubber reaction disc are sequentially arranged in the control chamber. The side of the control chamber close to the air filter is the front chamber of the control chamber. The valve piston blocks the front chamber of the control chamber and forms an atmospheric chamber. There is an atmospheric valve between the atmospheric chamber and the first chamber. A push rod is arranged in the control chamber. A first spring and a second spring are movably connected to the periphery of the push rod. The push rod is connected to the central position of the diaphragm.

[0012] Further, a lift valve is also arranged in the control chamber. The lift valve is used to control the opening and closing of the channel between the first chamber and the second chamber.

[0013] Further, a dust cover is arranged on the housing.

[0014] Further, first chutes are symmetrically opened on the first-stage support plate. First sliders corresponding to the first chutes are connected to the two second-stage support plates. Second chutes are opened on the sides of the two second-stage support plates away from the first sliders. Second sliders corresponding to the second chutes are connected to the two third-stage support plates.

[0015] Further, limiting structures are arranged at both ends of the first slider and the second slider.

[0016] Further, when the pressure difference P on both sides of the diaphragm is fixed, the boost value F of the diaphragm is proportional to the effective area A of the diaphragm.

[0017] The beneficial effects of the present invention are as follows: The present invention provides an automotive vacuum booster with adjustable vacuum boost ratio, having the following advantages:

[0018] 1. Through the cooperation of a multi-stage cylinder and an adjusting rod, the present invention realizes the dynamic adjustment of the effective area of the diaphragm, with a fast response speed and high adjustment accuracy.

[0019] 2. The boost ratio adjustment mechanism of the present invention adopts a multi-stage support plate and an adjustment component, with a simple structure and easy implementation.

[0020] 3. By adjusting the vacuum boost ratio, the present invention can make the braking pedal force more in line with personal needs. In scenarios where less braking force is required, the boost ratio is increased to reduce the driver's force on the braking pedal and improve driving comfort.

[0021] The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and implement it according to the content of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation manners of the present invention are given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and the illustrative embodiments and descriptions thereof are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 is a schematic structural diagram of an overall automotive vacuum booster with adjustable vacuum boost ratio proposed by the present invention.

[0024] Figure 2 is a schematic structural diagram of a boost ratio adjustment mechanism in an automotive vacuum booster with adjustable vacuum boost ratio proposed by the present invention.

[0025] Figure 3 is a schematic structural diagram of a support plate assembly in an automotive vacuum booster with adjustable vacuum boost ratio proposed by the present invention.

[0026] In the figure: 1. Housing; 2. Vacuum source connector; 3. Push rod; 4. Diaphragm; 5. First chamber; 6. Second chamber; 7. Dust cover; 8. Air filter; 9. First spring; 10. Control chamber; 11. Second spring; 12. Lift valve; 13. Valve piston; 14. Rubber reaction disk; 15. Boost ratio adjustment mechanism; 16. Support plate assembly; 17. Adjustment component; 18. First-stage support plate; 19. Second-stage support plate; 20. Third-stage support plate; 21. Multi-stage cylinder; 22. Adjusting rod; 23. Atmosphere valve; 24. First chute; 25. First slider; 26. Second chute; 27. Second slider. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following is combined with the attached Figures 1 - 3The principles and features of the present invention are described. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention. In the following paragraphs, the present invention will be described more specifically by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description and the claims. It should be noted that the accompanying drawings are all in very simplified forms and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the objectives of the embodiments of the present invention.

[0028] It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] Embodiment 1

[0031] As Figure 1 shown, the present invention provides an automotive vacuum booster with adjustable vacuum assist ratio, including a housing 1, a diaphragm 4, a control chamber 10 and a boost ratio adjustment mechanism 15;

[0032] One side of the housing 1 is provided with a vacuum source connector 2, and a check valve is provided inside the vacuum source connector 2. A dust cover 7 is provided on the housing 1, and the dust cover 7 is breathable, so as to ensure that external air can enter the front chamber of the control chamber through the dust cover 7 and the air filter 8;

[0033] The diaphragm 4 divides the inner cavity of the housing 1 into a first chamber 5 and a second chamber 6. A channel is provided between the first chamber 5 and the second chamber 6, and the second chamber 6 is arranged close to the vacuum source connector 2;

[0034] The control chamber 10 is arranged on the side of the first chamber 5 away from the second chamber 6, and the control chamber 10 is used to control the communication relationship between the vacuum chamber and the atmosphere chamber;

[0035] Inside the control chamber 10, an air filter 8, a valve piston 13, and a rubber reaction disk 14 are sequentially provided. The side of the control chamber 10 close to the air filter 8 is the front chamber of the control chamber. The valve piston 13 blocks the front chamber of the control chamber 10 and forms an atmosphere chamber. An atmosphere valve 23 is provided between the atmosphere chamber and the first chamber 5. A push rod 3 is provided inside the control chamber 10. A first spring 9 and a second spring 11 are movably connected to the periphery of the push rod 3. The push rod 3 is connected to the central position of the diaphragm 4;

[0036] A lift valve 12 is further provided inside the control chamber 10. The lift valve 12 is used to control the opening and closing of the passage between the first chamber 5 and the second chamber 6;

[0037] When the brake pedal is not depressed, the valve piston 13 blocks the external air, making the air pressure in the front chamber of the control chamber the same as the external atmospheric pressure. The vacuum source connector 2 evacuates the air in the second chamber 6 through the connected pipeline. At this time, the passage between the first chamber 5 and the second chamber 6 is in an open state. Furthermore, both the first chamber 5 and the second chamber 6 are in a vacuum state;

[0038] When the driver depresses the brake pedal, the push rod 3 pushes the lift valve 12 to move towards the second chamber 6 and closes the passage between the first chamber 5 and the second chamber 6. When the push rod 3 is further pushed, the valve piston 13 disengages from the lift valve 12. The valve piston 13 releases the closing of the atmosphere valve 23. The control chamber 10 is communicated with the first chamber 5. Furthermore, an obvious pressure difference is formed between the first chamber 5 and the second chamber 6. The pressure in the first chamber 5 is greater than the pressure in the second chamber 6. Under the action of the pressure, the diaphragm 4 is pushed towards the second chamber 6, thereby achieving a boosting effect.

[0039] Embodiment Two

[0040] As Figures 1 - 3 shown, on the basis of Embodiment One, the following improvements are further made:

[0041] When the driver depresses the brake pedal, under the action of the pressure difference, the diaphragm 4 drives the push rod 3 to move, thereby generating a boosting force. During a single braking process, the pressure difference P between both sides of the diaphragm 4 is a fixed value. Furthermore, by changing the effective area A of the diaphragm 4, the change of the boosting force value F can be realized, and the boosting force value F is proportional to the effective area A of the diaphragm 4;

[0042] The boost ratio adjustment mechanism 15 is installed on one side of the diaphragm 4. The boost ratio adjustment mechanism 15 is located in the second chamber 6. The boost ratio adjustment mechanism 15 includes a support plate assembly 16 and an adjustment assembly 17. The support plate assembly 16 includes a first-stage support plate 18, a second-stage support plate 19, and a third-stage support plate 20. The first-stage support plate 18 is annular and fixedly installed on the inner wall of the housing 1. The second-stage support plate 19 is a semi-circular arc plate, and there are two of them. The two second-stage support plates 19 are symmetrically and slidably installed on the first-stage support plate 18 respectively. The third-stage support plate 20 is a semi-circular arc plate that is proportionally reduced from the second-stage support plate 19, and there are two of them. The two third-stage support plates 20 are symmetrically and slidably installed on the second-stage support plate 19 respectively. The adjustment assembly 17 includes a multi-stage cylinder 21 and an adjustment rod 22. The multi-stage cylinder 21 is installed outside the housing 1. The output end of the multi-stage cylinder 21 is connected to the adjustment rod 22. The adjustment rod 22 passes through the housing 1 and is connected to the third-stage support plate 20. There are two sets of the adjustment assembly 17, and the two adjustment rods 22 are symmetrically connected to the two third-stage support plates 20;

[0043] The first-stage support plate 18 is symmetrically provided with first chutes 24. The two second-stage support plates 19 are connected with first sliders 25 corresponding to the first chutes 24. The side of the two second-stage support plates 19 away from the first sliders 25 is provided with second chutes 26. The two third-stage support plates 20 are connected with second sliders 27 corresponding to the second chutes 26. Both ends of the first sliders 25 and the second sliders 27 are provided with limiting structures;

[0044] The third-stage support plate 20 is driven to slide by the multi-stage cylinder 21. When the two third-stage support plates 20 move towards each other, the support area of the support plate assembly 16 becomes larger. When the two third-stage support plates 20 are continuously pushed by the multi-stage cylinder 21 towards the central position, the two third-stage support plates 20 respectively drive the two second-stage support plates 19 to move towards each other, and the support area of the support plate assembly 16 becomes even larger;

[0045] By changing the support area A of the support plate assembly 16 for the diaphragm 4, the effective area A of the diaphragm 4 is changed. The larger the support area of the support plate assembly 16, the smaller the effective area A of the diaphragm 4.

[0046] The working principle is as follows:

[0047] Adjust the boost ratio according to the driver's habit to make the braking pedal force more in line with personal needs; when it is necessary to increase the boost ratio, the third-stage support plate 20 is pushed towards the center by the multi-stage cylinder 21, driving the second-stage support plate 19 to slide, the support area of the support plate assembly 16 increases, the effective area of the diaphragm 4 decreases, the boost value F decreases, and the boost ratio increases; when it is necessary to decrease the boost ratio, the multi-stage cylinder 21 pulls the third-stage support plate 20 to move outwards, the support area of the support plate assembly 16 decreases, the effective area of the diaphragm 4 increases, the boost value F increases, and the boost ratio decreases; by controlling the stroke of the multi-stage cylinder 21, the support area of the support plate assembly 16 can be accurately adjusted, thereby realizing the dynamic adjustment of the effective area of the diaphragm 4. This adjustment method can adjust the boost ratio in real time according to the driver's habit, vehicle load or road condition requirements, improving the flexibility and adaptability of the braking system.

[0048] The above is only the preferred embodiment of the present invention, and does not impose any form of limitation on the present invention; any ordinary technician in the industry can smoothly implement the present invention according to the illustrations in the specification and the above description; however, any equivalent changes made by those skilled in the art within the scope of the technical solution of the present invention by using the technical content disclosed above, such as minor modifications, decorations and evolutions, are all equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An automobile vacuum booster with adjustable vacuum boost ratio, characterized in that: include: A housing (1), wherein a vacuum source connector (2) is provided on one side of the housing (1), and a one-way valve is provided inside the vacuum source connector (2); a diaphragm (4), wherein the diaphragm (4) divides the inner cavity of the housing (1) into a first chamber (5) and a second chamber (6), a passage being provided between the first chamber (5) and the second chamber (6), and the second chamber (6) being provided close to the vacuum source connector (2); A control chamber (10), the control chamber (10) being arranged on a side of the first chamber (5) away from the second chamber (6), the control chamber (10) being used to control the communication relationship between the vacuum chamber and the atmospheric chamber; A power-assistance ratio adjustment mechanism (15), the power-assistance ratio adjustment mechanism (15) being installed on one side of the diaphragm (4), the power-assistance ratio adjustment mechanism (15) being located in the second chamber (6), the power-assistance ratio adjustment mechanism (15) comprising a support plate assembly (16) and an adjustment assembly (17), the support plate assembly (16) comprising a first-stage support plate (18), a second-stage support plate (19) and a third-stage support plate (20), the first-stage support plate (18) being annular and fixedly installed on the inner wall of the housing (1), the second-stage support plate (19) being a semicircular arc plate, and being provided with two, the two second-stage support plates (19) being symmetrically slidably installed on the first-stage support plate (1 8), the third-stage support plate (20) is a semicircular arc plate that is proportionally reduced from the second-stage support plate (19), and two third-stage support plates (20) are provided, and the two third-stage support plates (20) are symmetrically slidably mounted on the second-stage support plate (19), the adjustment component (17) comprises a multi-stage cylinder (21) and an adjustment rod (22), the multi-stage cylinder (21) is mounted outside the housing (1), the output end of the multi-stage cylinder (21) is connected to the adjustment rod (22), the adjustment rod (22) penetrates the housing (1) and is connected to the third-stage support plate (20), the adjustment component (17) is provided with two groups, and the two adjustment rods (22) are symmetrically connected to the two third-stage support plates (20).

2. The automobile vacuum booster with adjustable vacuum boost ratio according to claim 1, characterized in that: An air filter (8), a valve piston (13) and a rubber reaction disc (14) are arranged in sequence in the control chamber (10); the side of the control chamber (10) close to the air filter (8) is a control chamber front chamber; the valve piston (13) blocks the control chamber front chamber of the control chamber (10) and forms an atmospheric cavity; an atmospheric valve (23) is arranged between the atmospheric cavity and the first chamber (5); a push rod (3) is arranged in the control chamber (10); the push rod (3) is movably connected to a first spring (9) and a second spring (11) at the periphery thereof; and the push rod (3) is connected to the center position of the diaphragm (4).

3. The automobile vacuum booster with adjustable vacuum boost ratio according to claim 1, characterized in that: A lift valve (12) is also provided in the control chamber (10), and the lift valve (12) is used to control the opening and closing of the channel between the first chamber (5) and the second chamber (6).

4. The automobile vacuum booster with adjustable vacuum boost ratio according to claim 2, characterized in that: The housing (1) is provided with a dust cover (7).

5. The automobile vacuum booster with adjustable vacuum boost ratio according to claim 1, characterized in that: The first-stage support plate (18) is symmetrically provided with a first slide groove (24), the two second-stage support plates (19) are connected with a first slide block (25) corresponding to the first slide groove (24), the two second-stage support plates (19) are provided with a second slide groove (26) on a side away from the first slide block (25), and the two third-stage support plates (20) are connected with a second slide block (27) corresponding to the second slide groove (26).

6. The automobile vacuum booster with adjustable vacuum boost ratio according to claim 5, characterized in that: Both ends of the first sliding block (25) and the second sliding block (27) are provided with limiting structures.

7. The automobile vacuum booster with adjustable vacuum boost ratio according to claim 1, characterized in that: When the pressure difference P on both sides of the diaphragm (4) is fixed, the boost value F of the diaphragm (4) is proportional to the effective area A of the diaphragm (4).

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