An automobile vacuum booster with adjustable vacuum assist ratio

Abstract

The application discloses an automobile vacuum booster with adjustable vacuum assist ratio, and relates to the technical field of automobile braking systems.The automobile vacuum booster comprises a shell, a diaphragm, a control chamber and an assist ratio adjusting mechanism.The diaphragm divides the inner cavity of the shell into a first chamber and a second chamber.The control chamber is used for controlling the communication relationship between a vacuum cavity and an atmospheric cavity.The assist ratio adjusting mechanism is installed on one side of the diaphragm, and comprises a support plate assembly and an adjusting assembly.The support plate assembly comprises a first-stage support plate, a second-stage support plate and a third-stage support plate.The adjusting assembly comprises a multi-stage cylinder and an adjusting rod.The multi-stage support plates are slidably connected, and the support area of the support plate composed of the multi-stage support plates is changed through the multi-stage cylinder.The support plate assembly supports the diaphragm, so that the effective area of the diaphragm is changed.The effective area of the diaphragm is changed through the cooperation of the support plate assembly and the multi-stage cylinder, and the dynamic adjustment of the assist ratio is realized.

Description

Technical Field

[0001] This invention relates to the field of automotive braking system technology, and in particular to an automotive vacuum booster with an adjustable vacuum boost ratio. Background Technology

[0002] The automotive vacuum booster is an important component of the automotive braking system. Its function is to use the vacuum generated by the engine intake manifold to amplify the force of the driver pressing the brake pedal through a diaphragm, thereby reducing the driver's braking effort.

[0003] Traditional vacuum boosters have a fixed boost ratio, which cannot be adjusted according to different driving conditions and driver needs. Therefore, an adjustable vacuum booster for automobiles is proposed. Summary of the Invention

[0004] The main objective of this invention is to provide an automotive vacuum booster with an adjustable vacuum booster ratio. By changing the effective area of ​​the diaphragm, the booster ratio can be dynamically adjusted, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the present invention provides an adjustable vacuum booster for automobiles, comprising a housing, a diaphragm, a control chamber, and a booster ratio adjustment mechanism;

[0006] A vacuum source connector is provided on one side of the housing, and a one-way valve is provided inside the vacuum source connector;

[0007] The diaphragm divides the inner cavity of the outer shell into a first chamber and a second chamber, with a channel between the first chamber and the second chamber, and the second chamber is located near the vacuum source connector;

[0008] The control room is located on the side of the first chamber away from the second chamber, and the control room is used to control the communication between the vacuum chamber and the atmospheric chamber;

[0009] The assist ratio adjustment mechanism is installed on one side of the diaphragm and located in the second chamber. The assist 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 outer shell. 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 slidably installed on the first-stage support plate. The third-stage support plate is a proportionally reduced semi-circular arc plate of the second-stage support plate, and there are two of them. The two third-stage support plates are symmetrically slidably installed on the second-stage support plate. The adjustment assembly includes a multi-stage cylinder and an adjustment rod. The multi-stage cylinder is installed outside the outer shell, and the output end of the multi-stage cylinder is connected to the adjustment rod. The adjustment rod passes through the outer shell and connects to the third-stage support plate. The adjustment assembly has two sets, with two adjustment rods symmetrically connected to two third-stage support plates.

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

[0011] Furthermore, the control chamber is provided with an air filter, a valve piston, and a rubber reaction disc in sequence. The side of the control chamber closest to the air filter is the front chamber of the control chamber. The valve piston blocks the front chamber of the control chamber, forming an atmospheric cavity. An atmospheric valve is provided between the atmospheric cavity and the first chamber. A push rod is provided 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 center position of the diaphragm.

[0012] Furthermore, the control room is also equipped with a lift valve, which is used to control the opening and closing of the passage between the first chamber and the second chamber.

[0013] Furthermore, the outer casing is provided with a dust cover.

[0014] Furthermore, the first-level support plate is symmetrically provided with first sliding grooves, the two second-level support plates are connected with first sliders corresponding to the first sliding grooves, the two second-level support plates are provided with second sliding grooves on the side away from the first sliders, and the two third-level support plates are connected with second sliders corresponding to the second sliding grooves.

[0015] Furthermore, both ends of the first and second sliders are provided with limiting structures.

[0016] Furthermore, when the pressure difference P across the diaphragm is fixed, the assist value F of the diaphragm is proportional to the effective area A of the diaphragm.

[0017] The beneficial effects of this invention are as follows: This invention provides an adjustable vacuum booster for automobiles, which has the following advantages:

[0018] 1. This invention achieves dynamic adjustment of the effective area of ​​the diaphragm through the cooperation of multi-stage cylinders and adjusting rods, with fast response speed and high adjustment accuracy.

[0019] 2. The assist ratio adjustment mechanism of the present invention adopts a multi-stage support plate and adjustment components, which has a simple structure and is easy to implement.

[0020] 3. By adjusting the vacuum boost ratio, this invention can make the brake pedal force more suited to individual needs. In scenarios requiring less braking force, increasing the boost ratio reduces the force required for the driver to press the brake pedal, thus improving driving comfort.

[0021] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail below with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic diagram of the overall structure of an adjustable vacuum booster for automobiles proposed in this invention.

[0024] Figure 2 This is a schematic diagram of the boost ratio adjustment mechanism in an adjustable vacuum booster for automobiles, as proposed in this invention.

[0025] Figure 3 This is a schematic diagram of the support plate assembly in an adjustable vacuum booster for automobiles, as proposed in this invention.

[0026] In the diagram: 1. Outer shell; 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 disc; 15. Boost ratio adjustment mechanism; 16. Support plate assembly; 17. Adjustment assembly; 18. First-stage support plate; 19. Second-stage support plate; 20. Third-stage support plate; 21. Multi-stage cylinder; 22. Adjusting rod; 23. Atmospheric valve; 24. First slide groove; 25. First slider; 26. Second slide groove; 27. Second slider. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-3The principles and features of the present invention are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention. The invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the invention will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0028] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is described as "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is described as "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] Example 1

[0031] like Figure 1 As shown, the present invention provides an adjustable vacuum booster for automobiles, including a housing 1, a diaphragm 4, a control chamber 10, and a booster ratio adjustment mechanism 15.

[0032] A vacuum source connector 2 is provided on one side of the outer casing 1. A one-way valve is provided inside the vacuum source connector 2. A dust cover 7 is provided on the outer casing 1. The dust cover 7 is breathable, thereby ensuring that external air can enter the control room anteroom through the dust cover 7 and the air filter 8.

[0033] The diaphragm 4 divides the inner cavity of the outer shell 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. The second chamber 6 is located close to the vacuum source connector 2.

[0034] The control chamber 10 is located 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 atmospheric chamber.

[0035] The control chamber 10 is provided with an air filter 8, a valve piston 13 and a rubber reaction disc 14 in sequence. The side of the control chamber 10 closest to the air filter 8 is the 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 provided between the atmospheric cavity and the first chamber 5. A push rod 3 is provided in 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 center position of the diaphragm 4.

[0036] The control room 10 is also equipped with a lift valve 12, which is used to control the opening and closing of the passage between the first chamber 5 and the second chamber 6;

[0037] Without pressing the brake pedal, the valve piston 13 blocks the outside air, making the air pressure in the front chamber of the control chamber the same as the outside 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 open, so both the first chamber 5 and the second chamber 6 are in a vacuum state.

[0038] When the driver presses the brake pedal, the push rod 3 pushes the lift valve 12 to move closer to the second chamber 6, and closes the passage between the first chamber 5 and the second chamber 6. When the push rod 3 is pushed further, the valve piston 13 disengages from the lift valve 12, and the valve piston 13 releases the closure of the atmospheric valve 23. The control chamber 10 is connected to the first chamber 5, thereby forming a significant pressure difference 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 pressure, the diaphragm 4 is pushed closer to the second chamber 6, thereby achieving the power assist effect.

[0039] Example 2

[0040] like Figure 1-3 As shown, the following improvements are made based on Embodiment 1:

[0041] When the driver presses the brake pedal, the diaphragm 4 moves the push rod 3 under the action of pressure difference, thereby generating assistance. During one braking process, the pressure difference P on both sides of the diaphragm 4 is a fixed value. Then, by changing the effective area A of the diaphragm 4, the assistance value F can be changed, and the assistance value F is proportional to the effective area A of the diaphragm 4.

[0042] The assist ratio adjustment mechanism 15 is installed on one side of the diaphragm 4. The assist ratio adjustment mechanism 15 is located within the second chamber 6. The assist 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 outer casing 1. The second-stage support plate 19 is a semi-circular arc plate, and two of them are provided. The two second-stage support plates 19 are symmetrically slidably installed on the first-stage support plate 18. The third-level support plate 20 is a semi-circular arc plate that is proportionally reduced from the second-level support plate 19, and there are two of them. The two third-level support plates 20 are symmetrically slidably mounted on the second-level support plate 19. The adjustment assembly 17 includes a multi-stage cylinder 21 and an adjustment rod 22. The multi-stage cylinder 21 is mounted outside the outer shell 1. The output end of the multi-stage cylinder 21 is connected to the adjustment rod 22. The adjustment rod 22 passes through the outer shell 1 and is connected to the third-level support plate 20. The adjustment assembly 17 has two sets, and the two adjustment rods 22 are symmetrically connected to the two third-level support plates 20.

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

[0044] The third-level support plate 20 is slid by the multi-stage cylinder 21. When the two third-level support plates 20 move towards each other, the support area of ​​the support plate assembly 16 increases. When the two third-level support plates 20 continue to be pushed towards the center by the multi-stage cylinder 21, the two third-level support plates 20 respectively drive the two second-level support plates 19 to move towards each other, and the support area of ​​the support plate assembly 16 further increases.

[0045] The effective area A of the diaphragm 4 is changed by changing the support area A of the support plate assembly 16 on the diaphragm 4. 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] The assist ratio can be adjusted according to the driver's habits to make the brake pedal force more suitable for individual needs. When the assist ratio needs to be increased, the multi-stage cylinder 21 pushes the third-stage support plate 20 to move towards the center, causing the second-stage support plate 19 to slide. This increases the support area of ​​the support plate assembly 16, decreases the effective area of ​​the diaphragm 4, decreases the assist value F, and increases the assist ratio. When the assist ratio needs to be decreased, the multi-stage cylinder 21 pulls the third-stage support plate 20 outward. This decreases the support area of ​​the support plate assembly 16, increases the effective area of ​​the diaphragm 4, increases the assist value F, and decreases the assist ratio. By controlling the stroke of the multi-stage cylinder 21, the support area of ​​the support plate assembly 16 can be precisely adjusted, thereby achieving dynamic adjustment of the effective area of ​​the diaphragm 4. This adjustment method can adjust the assist ratio in real time according to the driver's habits, vehicle load, or road conditions, improving the flexibility and adaptability of the braking system.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. An adjustable vacuum booster for automobiles, characterized in that, include: The outer casing (1) has a vacuum source connector (2) on one side, and a one-way valve is provided inside the vacuum source connector (2); A diaphragm (4) divides the inner cavity of the outer shell (1) into a first chamber (5) and a second chamber (6), with a channel between the first chamber (5) and the second chamber (6), and the second chamber (6) is located near the vacuum source connector (2). A control room (10) is located on the side of the first chamber (5) away from the second chamber (6). The control room (10) is used to control the communication relationship between the vacuum chamber and the atmospheric chamber. A power assist ratio adjustment mechanism (15) is installed on one side of the diaphragm (4) and located in the second chamber (6). The power assist 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 outer shell (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 slidably installed on the first-stage support plate (18). 8) The third-level support plate (20) is a semi-circular arc plate that is proportionally reduced from the second-level support plate (19), and there are two of them. The two third-level support plates (20) are symmetrically slidably installed on the second-level support plate (19). The adjustment component (17) includes a multi-stage cylinder (21) and an adjustment rod (22). The multi-stage cylinder (21) is installed outside the outer shell (1). The output end of the multi-stage cylinder (21) is connected to the adjustment rod (22). The adjustment rod (22) passes through the outer shell (1) and is connected to the third-level support plate (20). The adjustment component (17) has two sets, and the two adjustment rods (22) are symmetrically connected on the two third-level support plates (20).

2. The adjustable vacuum booster for automobiles according to claim 1, characterized in that, The control chamber (10) is provided with an air filter (8), a valve piston (13) and a rubber reaction disc (14) in sequence. The side of the control chamber (10) closest to the air filter (8) is the 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 provided between the atmospheric cavity and the first chamber (5). A push rod (3) is provided in 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 center position of the diaphragm (4).

3. The adjustable vacuum booster for automobiles according to claim 1, characterized in that, The control room (10) is also equipped with a lift valve (12), which is used to control the opening and closing of the passage between the first chamber (5) and the second chamber (6).

4. The adjustable vacuum booster for automobiles according to claim 2, characterized in that, The outer casing (1) is provided with a dust cover (7).

5. An adjustable vacuum booster for automobiles according to claim 1, characterized in that, The first-level support plate (18) is symmetrically provided with first sliding grooves (24), and the two second-level support plates (19) are connected with first sliders (25) corresponding to the first sliding grooves (24). The two second-level support plates (19) are provided with second sliding grooves (26) on the side away from the first sliders (25), and the two third-level support plates (20) are connected with second sliders (27) corresponding to the second sliding grooves (26).

6. An adjustable vacuum booster for automobiles according to claim 5, characterized in that, Both ends of the first slider (25) and the second slider (27) are provided with limiting structures.

7. An adjustable vacuum booster for automobiles according to claim 1, characterized in that, When the pressure difference P on both sides of the diaphragm (4) is fixed, the assist value F of the diaphragm (4) is proportional to the effective area A of the diaphragm (4).

Images