Variable power ratio vacuum booster

Abstract

The utility model relates to the technical field of power booster, especially a variable power ratio vacuum power booster, including dustproof control cover, the lower extreme fixed connection of dustproof control cover has upper casing, the upper end middle part of upper casing is opened and has the upper through -hole of through, the upper through -hole is located in dustproof control cover, the lower extreme fixed connection of upper casing has lower casing, the lower extreme right part of lower casing is fixedly connected with vacuum source connecting pipe, the upper end middle part of dustproof control cover is inserted and has pusher device with activity connection. The utility model discloses a variable power ratio vacuum power booster, dustproof control cover is connected with upper, lower casing and other components, realizes internal communication through the upper through -hole, and vacuum power environment is built with vacuum source connecting pipe, diaphragm piece separates chamber auxiliary pressure regulation, pusher device is linked through through -hole no.

Description

Technical Field

[0001] This utility model relates to the field of booster technology, and in particular to a vacuum booster with a variable booster ratio. Background Technology

[0002] When driving at high speeds or during emergency braking, drivers need greater braking force to quickly decelerate and stop the vehicle. Variable assist ratio vacuum boosters can dynamically adjust the assist intensity according to the driving scenario, allowing drivers to easily press the pedal, shorten the braking distance, and improve driving safety. In contrast, traditional vacuum boosters have a fixed assist ratio, which can lead to excessive braking at low speeds and insufficient assistance under high speeds and heavy loads. In addition, traditional boosters have defects in structural design and materials, such as easy aging of seals and easy wear and jamming of mechanical parts, resulting in vacuum leakage and frequent failures. They are unable to meet the needs of complex working conditions, affecting the reliability of the braking system and the driving experience. Utility Model Content

[0003] The main objective of this invention is to provide a vacuum booster with a variable booster ratio, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A variable-ratio vacuum booster includes a dust control cover. An upper housing is fixedly connected to the lower end of the dust control cover. A through-hole is located in the middle of the upper end of the upper housing. A lower housing is fixedly connected to the lower end of the upper housing. A vacuum source connecting pipe is fixedly connected to the right side of the lower end of the lower housing. A pushing device is movably connected to the middle of the upper end of the dust control cover. A brake pedal connector is fixedly connected to the upper end of the pushing device. A diaphragm is fixedly connected to the upper part of the inner wall of the lower housing, and the diaphragm is located in the lower part of the upper housing. The diaphragm divides the upper and lower housings into an upper chamber and a lower chamber. A second through-hole is located in the middle of the upper end of the diaphragm. The lower part of the pushing device passes through the second through-hole and is located in the lower part of the lower housing. Preferably, the pushing device includes a push rod, the lower middle part of which is fixedly connected, a fluororubber upper stop block is inserted and fixedly connected to the upper part of the outer surface of the push rod, a spring is fixedly connected to the lower end of the fluororubber upper stop block, the spring is movably connected to the push rod, a fluororubber block is inserted and fixedly connected to the lower part of the outer surface of the push rod, a lifting valve is fixedly connected to the lower end of the push rod, and a control pressing component is fixedly connected to the lower end of the lifting valve.

[0005] By adopting the above technical solution: the push rod connects to the brake pedal and transmits the pedaling force; the fluororubber upper stop block cooperates with the dust control cover to seal and prevent dust; the spring provides the restoring force; the fluororubber block ensures the sealing of the push rod movement; the lifting valve controls the airflow cut-off; and the control down-pressing component coordinates and adjusts the assist to ensure accurate braking response.

[0006] Preferably, the fluororubber upper stop is located in the upper part of the dust control cover, and the upper end face of the fluororubber upper stop is in close contact with but not fixed to the inner upper wall of the dust control cover. The end of the spring away from the fluororubber upper stop is fixedly connected to the upper end of the upper shell.

[0007] By adopting the above technical solution: the fluororubber upper stop block is tightly abutted against the inner upper wall of the dust control cover to prevent dust and impurities from entering and to protect the internal structure; the spring connects the upper housing and the stop block; after the push rod is activated, it returns to its original position by its elasticity, maintaining the stable operation of the booster and extending its service life.

[0008] Preferably, the fluororubber block matches the size of the upper through hole, and the fluororubber block is inserted into the upper housing through the upper through hole.

[0009] By adopting the above technical solution, the fluororubber block is matched with the size of the upper through hole to achieve a tight connection. During the movement of the push rod, it effectively prevents external air or impurities from entering the upper housing, ensuring a stable vacuum environment inside the vacuum booster and improving the boosting effect and reliability.

[0010] Preferably, the position of the lifting valve corresponds to and the size of the through hole two are matched, and the lifting valve is inserted into the diaphragm through the through hole two.

[0011] By adopting the above technical solution: the lifting valve and the through hole are connected to the corresponding diaphragm, and the vacuum and air pressure balance of the upper and lower chambers are precisely controlled to achieve the adjustment of the assist ratio. When the brake is applied, the airflow path is precisely controlled to provide braking assistance as needed, thereby enhancing braking safety and sensitivity.

[0012] Preferably, the dust control cover communicates with the interior of the upper shell through the upper through hole, and the upper chamber communicates with the interior of the lower chamber through the second through hole.

[0013] By adopting the above technical solution: the dust control cover is connected to the upper shell through the upper through hole, which facilitates airflow and component layout. The upper and lower chambers are connected through the two through holes, providing a spatial basis for vacuum assistance, and assisting the lifting valve to adjust the pressure difference, ensuring the efficient operation of the booster.

[0014] Preferably, the control pressing assembly includes a base frame, the lower end and the upper end of which are fixedly connected to the middle of the inner lower wall of the lower housing and the lower end of the diaphragm, respectively. Four through vents are opened on the upper part of the outer surface of the base frame. A second spring is fixedly connected to the inner lower wall of the base frame, and a rubber reaction disc is fixedly connected to the end of the second spring away from the base frame.

[0015] By adopting the above technical solution: the bottom frame connects the lower housing and the diaphragm to provide structural support, the vent balances the air pressure, the spring buffer resets, the rubber reaction disc receives the pressure of the boost valve, and the assist ratio is adjusted in a coordinated manner to ensure stable braking assist.

[0016] Preferably, the diameter area of ​​the rubber reaction disc is equal to the inner diameter area of ​​the bottom frame, the rubber reaction disc is located on the upper side of the four vents, and the rubber reaction disc is fixedly connected to the lower end of the lifting valve.

[0017] By adopting the above technical solution: the rubber reaction disc is adapted to the inner diameter of the bottom frame and is located above the air vent, accurately transmitting the pressure of the boost valve. In conjunction with spring two, it effectively adjusts the air pressure difference between the upper and lower chambers, realizes dynamic adjustment of the power assist ratio, and improves the sensitivity and reliability of the braking system.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. In this utility model, the force of the brake pedal is transmitted to the push rod through the connector, which drives the lifting valve to operate, thereby adjusting the air pressure in the chamber to achieve power assist. The fluororubber upper stop block and fluororubber block ensure sealing, prevent dust intrusion and gas leakage, and ensure a stable vacuum environment. Spring 1 provides a reset force, so that the push rod returns to its original position in time after being pressed. The control pressing component works with the lifting valve to precisely control the amount of power assist. The entire device is ingeniously designed, which not only solves the problems of poor sealing and inflexible power assist adjustment of traditional power boosters, but also enhances braking reliability and driving safety, providing efficient and stable power assist support for vehicle braking.

[0019] 2. In this utility model, the bottom frame firmly connects the lower housing and the diaphragm, providing solid support for the components. The vent can balance the air pressure, avoiding the impact of uneven pressure on the power assist effect. The second spring and the rubber reaction disc work together. When the lifting valve is pressed down, the rubber reaction disc is deformed by pressure, and the second spring plays a buffering and restoring role, reducing the impact and wear between mechanical parts. At the same time, the matching design of the rubber reaction disc and the bottom frame ensures stable pressure transmission, accurately adjusts the air pressure difference between the upper and lower chambers, realizes dynamic adjustment of the power assist ratio, enhances the stability and safety of the braking system, and improves the driving experience. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a vacuum booster with a variable booster ratio according to the present invention. Figure 2 This is a cross-sectional view of the connection structure between the dust control cover, the upper shell, and the lower shell of a vacuum booster with variable boost ratio according to this utility model. Figure 3 This is a schematic diagram of the overall structure of the driving device of a vacuum booster with variable assist ratio according to this utility model; Figure 4This is a schematic diagram of the overall structure of the control and pressing component of a vacuum booster with variable boost ratio according to this utility model.

[0021] In the diagram: 1. Dust control cover; 2. Upper housing; 3. Lower housing; 4. Vacuum source connecting pipe; 5. Pushing device; 6. Brake pedal connector; 7. Upper through hole; 8. Diaphragm; 9. Upper chamber; 10. Lower chamber; 11. Through hole two; 50. Push rod; 51. Fluororubber upper stop block; 52. Spring one; 53. Fluororubber block; 54. Lifting valve; 55. Control downpressure assembly; 551. Base frame; 552. Vent; 553. Spring two; 554. Rubber reaction disc. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Please see Figure 1-4 This utility model provides a technical solution: A variable-ratio vacuum booster includes a dust control cover 1. An upper housing 2 is fixedly connected to the lower end of the dust control cover 1. An upper through hole 7 is opened in the middle of the upper end of the upper housing 2 and is located inside the dust control cover 1. A lower housing 3 is fixedly connected to the lower end of the upper housing 2. A vacuum source connecting pipe 4 is fixedly connected to the right part of the lower end of the lower housing 3. A pushing device 5 is movably connected to the middle of the upper end of the dust control cover 1. A brake pedal connector 6 is fixedly connected to the upper end of the pushing device 5. A diaphragm 8 is fixedly connected to the upper part of the inner wall of the lower housing 3 and is located in the lower part of the upper housing 2. The diaphragm 8 divides the upper housing 2 and the lower housing 3 into an upper chamber 9 and a lower chamber 10. A through hole 11 is opened in the middle of the upper end of the diaphragm 8. The lower part of the pushing device 5 passes through the through hole 11 and is located in the lower part of the lower housing 3.

[0026] In this embodiment, the pushing device 5 includes a push rod 50, which is fixedly connected to the lower middle part of the brake pedal connector 6. A fluororubber upper stop block 51 is fixedly connected to the upper part of the outer surface of the push rod 50. A spring 52 is fixedly connected to the lower end of the fluororubber upper stop block 51, and the spring 52 is movably connected to the push rod 50. A fluororubber block 53 is fixedly connected to the lower part of the outer surface of the push rod 50. A lifting valve 54 is fixedly connected to the lower end of the push rod 50, and a control pressing component 55 is fixedly connected to the lower end of the lifting valve 54. The fluororubber upper stop block 51 is located inside the dustproof control cover 1. The upper end face of the fluororubber upper stop 51 is tightly abutted against but not fixed to the inner upper wall of the dust control cover 1. The end of the spring 52 away from the fluororubber upper stop 51 is fixedly connected to the upper end of the upper housing 2. The fluororubber block 53 matches the size of the upper through hole 7. The fluororubber block 53 is inserted into the upper housing 2 through the upper through hole 7. The position of the lifting valve 54 corresponds to the size of the second through hole 11. The lifting valve 54 is inserted into the diaphragm 8 through the second through hole 11. The dust control cover 1 communicates with the interior of the upper housing 2 through the upper through hole 7. The upper chamber 9 communicates with the interior of the lower chamber 10 through the second through hole 11.

[0027] Through the above scheme: when the driver presses the brake pedal, the force is transmitted to the push rod 50 through the brake pedal connector 6. The push rod 50 moves downward, the fluororubber upper stop block 51 abuts against the inner wall of the dust control cover 1 to prevent dust, the spring 52 is compressed and stores energy, the fluororubber block 53 ensures the seal at the upper through hole 7 to prevent air leakage, the push rod 50 drives the lifting valve 54 to pass through the through hole 11 to adjust the vacuum and air pressure balance state of the upper chamber 9 and the lower chamber 10, and the control lower pressure component 55 works in concert to change the assist ratio according to different working conditions. At high speed or heavy load, it provides greater assistance, and at low speed, it reduces assistance to avoid excessive braking, thereby realizing dynamic adjustment of assistance and improving braking safety and comfort.

[0028] In this embodiment, the control pressing assembly 55 includes a base frame 551. The lower end and upper end of the base frame 551 are fixedly connected to the middle of the inner lower wall of the lower housing 3 and the lower end of the diaphragm 8, respectively. Four through vents 552 are opened on the upper part of the outer surface of the base frame 551. A second spring 553 is fixedly connected to the inner lower wall of the base frame 551. A rubber reaction disc 554 is fixedly connected to the end of the second spring 553 away from the base frame 551. The diameter area of ​​the rubber reaction disc 554 is equal to the inner diameter area of ​​the base frame 551. The rubber reaction disc 554 is located above the four vents 552. The rubber reaction disc 554 is fixedly connected to the lower end of the lifting valve 54.

[0029] Through the above scheme: the bottom frame 551 firmly connects the lower housing 3 and the diaphragm 8, providing rigid support for the components; the vent 552 can balance the air pressure and avoid abnormal stress on the components due to uneven pressure; the second spring 553 cooperates with the rubber reaction disc 554. When the push rod 50 drives the lifting valve 54 to press down, the rubber reaction disc 554 is deformed by pressure, and the second spring 553 buffers and absorbs energy, reducing mechanical impact and wear. The rubber reaction disc 554 matches the inner diameter of the bottom frame 551, which can effectively reduce the risk of vacuum leakage, improve system reliability, adapt to complex working conditions, and ensure stable braking assist performance and driving experience.

[0030] It should be noted that this utility model is a vacuum booster with a variable assist ratio. During use, firstly, the vacuum source connecting pipe 4 is connected to the vacuum source, creating a vacuum environment in the lower chamber 10. When the driver presses the brake pedal, the brake pedal connector 6 drives the push rod 50 downwards. The fluororubber upper stop block 51 tightly abuts against the inner wall of the dust control cover 1, preventing dust accumulation. Spring 52 is compressed, and the fluororubber block 53 tightly fits with the upper through hole 7 to ensure a tight seal. The push rod 50 pushes the lifting valve 54 through the through hole 11 on the diaphragm 8, changing the air pressure balance between the upper chamber 9 and the lower chamber 10. Meanwhile, in the control assembly 55, the rubber reaction disc... Under the action of the lifting valve 54, spring 553 is squeezed, while the air vent 552 balances the air pressure. The assist ratio is dynamically adjusted according to the pedal force and vehicle operating conditions. After the brake pedal is released, spring 52 and spring 553 return to their original positions, and the booster returns to its initial state. Therefore, through ingenious structural design, the push rod 50, lifting valve 54 and control pressing component 55 work together to achieve dynamic adjustment of the assist ratio. At the same time, the fluororubber sealing component and precise dimensional matching effectively improve sealing performance and reliability, solving the problems of fixed assist ratio and easy structural damage in traditional boosters, and providing drivers with a safer, more comfortable and reliable braking experience.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A vacuum booster with a variable booster ratio, comprising a dust control cover (1), characterized in that: The lower end of the dust control cover (1) is fixedly connected to an upper shell (2). A through-hole (7) is opened in the middle of the upper end of the upper shell (2), and the through-hole (7) is located inside the dust control cover (1). The lower end of the upper shell (2) is fixedly connected to a lower shell (3). A vacuum source connecting pipe (4) is fixedly connected to the right side of the lower end of the lower shell (3). A pushing device (5) is movably connected to the middle of the upper end of the dust control cover (1). The pushing device (5)... A brake pedal connector (6) is fixedly connected to the upper end. A diaphragm (8) is fixedly connected to the upper part of the inner wall of the lower housing (3). The diaphragm (8) is located in the lower part of the upper housing (2). The diaphragm (8) divides the upper housing (2) and the lower housing (3) into an upper chamber (9) and a lower chamber (10). A through hole (11) is opened in the middle of the upper end of the diaphragm (8). The lower part of the pushing device (5) passes through the through hole (11) and is located in the lower part of the lower housing (3). The pushing device (5) includes a push rod (50), which is fixedly connected to the lower middle part of the brake pedal connector (6). A fluororubber upper stop block (51) is inserted and fixedly connected to the upper part of the outer surface of the push rod (50). A spring (52) is fixedly connected to the lower end of the fluororubber upper stop block (51). The spring (52) is inserted and movably connected to the push rod (50). A fluororubber block (53) is inserted and fixedly connected to the lower part of the outer surface of the push rod (50). A lifting valve (54) is fixedly connected to the lower end of the push rod (50). A control pressing component (55) is fixedly connected to the lower end of the lifting valve (54).

2. The vacuum booster with a variable booster ratio according to claim 1, characterized in that: The fluororubber upper stop (51) is located inside the upper part of the dust control cover (1), and the upper end face of the fluororubber upper stop (51) is in close contact with the inner upper wall of the dust control cover (1) but not fixed. The end of the spring (52) away from the fluororubber upper stop (51) is fixedly connected to the upper end of the upper shell (2).

3. A vacuum booster with a variable booster ratio according to claim 1, characterized in that: The size of the fluororubber block (53) matches that of the upper through hole (7), and the fluororubber block (53) is inserted into the upper shell (2) through the upper through hole (7).

4. A vacuum booster with a variable booster ratio according to claim 1, characterized in that: The lifting valve (54) is positioned and sized to match the through hole 2 (11), and the lifting valve (54) is connected to the diaphragm (8) through the through hole 2 (11).

5. A vacuum booster with a variable booster ratio according to claim 1, characterized in that: The dust control cover (1) is connected to the interior of the upper shell (2) through the upper through hole (7), and the upper chamber (9) is connected to the interior of the lower chamber (10) through the second through hole (11).

6. A vacuum booster with a variable booster ratio according to claim 1, characterized in that: The control pressing assembly (55) includes a bottom frame (551). The lower end and the upper end of the bottom frame (551) are fixedly connected to the middle of the inner lower wall of the lower housing (3) and the lower end of the diaphragm (8), respectively. Four through vents (552) are opened on the upper part of the outer surface of the bottom frame (551). A second spring (553) is fixedly connected to the inner lower wall of the bottom frame (551). A rubber reaction disc (554) is fixedly connected to the end of the second spring (553) away from the bottom frame (551).

7. A vacuum booster with a variable booster ratio according to claim 6, characterized in that: The diameter area of ​​the rubber reaction disc (554) is equal to the inner diameter area of ​​the bottom frame (551). The rubber reaction disc (554) is located on the upper side of the four vents (552). The rubber reaction disc (554) is fixedly connected to the lower end of the lift valve (54).

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