Lightweight electronic vacuum booster

Abstract

The application discloses a kind of light-weight electronic vacuum boosters, it is related to the technical field of automobile braking, including coaxial setting upper cover, lower cover and installation base, three are light-weight material and are fixed by fastening bolt through three. Inside is equipped with diaphragm and mounting seat to separate upper, lower air cavity. Diaphragm outer edge is clamped between upper cover and lower cover, and the inside and outside of diaphragm outer edge are provided with first convex ring with non-isosceles triangle cross section, and are matched with corresponding first concave ring to form self-locking;Diaphragm forms inverted U-shaped arc part, so that movement bending point changes along radial direction to disperse stress. Diaphragm inner edge is installed in mounting plate annular groove, and is sealed and fixed by second convex ring, second concave ring and sealing ring. The rib plate inside upper cover, mounting seat and lower cover is embedded with fiber reinforced part composed of upper wire bundle, lower wire bundle, annular wire bundle and fixed column, to improve strength and toughness. The application realizes light-weighting while ensuring reliable diaphragm positioning, fatigue resistance and high rigidity of shell.

Description

Technical Field

[0001] This invention relates to the field of automotive braking technology, and more particularly to a lightweight electronic vacuum booster. Background Technology

[0002] Electronic vacuum boosters are core components in automotive braking systems used to amplify the driver's pedal force. Their working principle relies on the pressure difference between vacuum and atmosphere. To align with the trend of energy conservation and emission reduction in automobiles, replacing metal housings with lightweight materials such as engineering plastics has become an important path to weight reduction. However, while plastic housings significantly reduce weight, their inherent rigidity and strength disadvantages become apparent, especially under conditions of repeated differential pressure loads. The housing is prone to deformation, posing new technical challenges to the reliable fixation of the diaphragm and the stable operation of the system.

[0003] The positioning reliability of the diaphragm directly determines the function and lifespan of the vacuum booster. Under actual pulsating pressure impacts, traditional clamping structures cannot completely prevent the diaphragm from undergoing minute creeping slippage. In severe cases, the outer edge may partially detach from the gap in the housing, causing air leakage or vacuum leakage between air chambers, leading to a decrease in boosting performance or even failure. At the same time, during axial movement of the diaphragm, the rubber material near the fixed area of ​​the outer edge will repeatedly bend with the movement, often concentrating the bending deformation on a fixed annular band. This localized stress concentration can trigger early fatigue cracks in the rubber material, greatly shortening the service life of the diaphragm.

[0004] In addition, simply increasing the density or height of the reinforcing ribs to improve the overall rigidity of the plastic shell will inevitably lead to a rebound in weight. Furthermore, the thermoplastic material itself has limited toughness, and cracks may still initiate and gradually propagate at the root of the ribs under bending moment. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention employs a self-locking clamping structure with a non-isosceles triangular cross-section, a U-shaped diaphragm arc design with dynamic bending points, and a reinforcing section with a continuous fiber bundle skeleton pre-embedded in the shell stiffener. These solutions solve the technical challenges of diaphragm slippage and displacement, localized fatigue cracking of rubber, and insufficient rigidity of plastic shell in lightweight electronic vacuum boosters. Specifically, these solutions are achieved through the following technical approaches.

[0006] This invention includes an upper cover, a lower cover, and a mounting base. The upper cover and the lower cover are fixedly connected and together form an internal cavity. The mounting base is fixed to the bottom of the lower cover. A positioning protrusion is provided on the top of the lower cover. The outer edge of a diaphragm is sandwiched between the inner surface of the upper cover and the outer surface of the positioning protrusion. The diaphragm divides the internal cavity into an upper air chamber and a lower air chamber. An axially movable mounting seat is provided in the internal cavity. The inner edge of the diaphragm is sealed to the mounting seat. A valve assembly for switching air paths is installed in the mounting seat. The invention is characterized by: The inner and outer surfaces of the outer edge of the diaphragm are provided with a first convex ring. The inner surface of the upper cover and the outer surface of the positioning protrusion are provided with a first concave ring that cooperates with the first convex ring. The cross-section of the first convex ring is a non-isosceles triangle, and the side length of the non-isosceles triangle closer to the outer edge of the diaphragm is greater than the side length farther from the outer edge. The inner side of the upper cover is also provided with a locking protrusion that corresponds to the positioning protrusion. The locking protrusion and the positioning protrusion together squeeze the diaphragm, so that the diaphragm forms an inverted U-shaped arc on the inner side of the locking protrusion. When the diaphragm moves axially, the highest point of the bending of the arc can change its position along the radial direction of the diaphragm. The upper cover, lower cover, and mounting base are provided with stiffening plates, and the stiffening plates are provided with reinforcing parts inside. The reinforcing parts include a skeleton made of fiber bundles, and the skeleton is fused and fixed to the base material of the stiffening plates.

[0007] Preferably, the mounting base includes a mounting plate and a mounting cylinder coaxially fixed. An annular groove is formed on the outer bottom of the mounting plate, and the inner edge of the diaphragm is placed in the annular groove. The innermost side of the annular groove and the inner edge of the diaphragm together form a mounting groove, and a sealing ring is provided in the mounting groove. A second convex ring is provided on both the upper and lower surfaces of the inner edge of the diaphragm. A second concave ring that mates with the second convex ring is formed on both the upper and lower surfaces of the annular groove. The cross-section of the second convex ring is a non-isosceles triangle, and the side length of the side closer to the inner edge of the diaphragm is greater than the side length of the side farther from the inner edge.

[0008] Preferably, the skeleton of the reinforcing part includes an upper wire harness, a lower wire harness, an annular wire harness, and a fixing post. The upper wire harness is disposed inside the side of the rib plate away from the main body it is connected to, and the lower wire harness is disposed inside the side of the rib plate close to the main body it is connected to. The upper and lower wire harnesses are aligned vertically. The annular wire harness is disposed inside the rib plate that extends in a ring shape and is divided into upper and lower layers. The upper annular wire harness is flush with the upper wire harness, and the lower annular wire harness is flush with the lower wire harness. The fixing post is vertically disposed and fixed at the intersection of the upper wire harness, the lower wire harness, and the annular wire harness.

[0009] Preferably, the upper wire harness, lower wire harness, and annular wire harness are formed by winding carbon fiber or glass fiber, and the fixing post is made of polyethylene terephthalate.

[0010] Preferably, the ribs on the upper cover include a first rib, a second rib, and a third rib. The first rib is arranged radially along the upper cover and is evenly distributed circumferentially. The second rib is coaxially arranged with the upper cover and is evenly distributed radially. The third rib has a rectangular outline and is provided in two sets. The two sets of third ribs are perpendicular to each other and are both coaxial with the upper cover.

[0011] Preferably, the upper surface of the mounting plate of the mounting base is provided with a fourth rib, a fifth rib, and a sixth rib. The fourth rib is arranged radially along the mounting plate and is evenly distributed circumferentially. The fifth rib is coaxially arranged with the mounting plate and is evenly distributed radially. The sixth rib is arranged between the two innermost fifth ribs radially. Each pair of intersecting sixth ribs forms a group, and multiple groups are evenly distributed circumferentially.

[0012] Preferably, a positioning ring is coaxially fixed to the outer edge of the lower cover, and the inner side of the positioning ring is in contact with the outer edge of the upper cover; at least two mounting sleeves are fixed inside the lower cover, and fastening bolts are inserted through the mounting sleeves; a corresponding recess is opened on the upper cover, the top of the mounting sleeve extends into the recess, and a sealing ring is provided between the top of the mounting sleeve and the recess.

[0013] Preferably, the bottom of the lower cover is provided with a seventh rib, an eighth rib, and a ninth rib. The seventh rib is arranged radially along the lower cover and is evenly distributed circumferentially. The eighth rib is coaxially arranged with the lower cover and is evenly distributed radially. The ninth rib has a square outline and is provided in two sets. The two sets of ninth ribs are at a 45-degree angle and are both coaxial with the lower cover.

[0014] Preferably, a push rod is connected to the bottom of the valve body assembly, and a pin is provided at the top of the valve body assembly, with the pin sealingly passing through the middle of the upper cover.

[0015] Preferably, a one-way valve is fixedly installed on the top of the upper cover, and the one-way valve communicates with the internal cavity; a return spring is installed between the mounting base and the upper cover.

[0016] After adopting the above technical solution, the beneficial effects of the present invention are: 1. The self-locking clamping structure of the diaphragm outer edge utilizes a first convex ring with a non-isosceles triangle cross-section and a first concave ring to form a wedge-tight fit. The hypotenuse of the non-isosceles triangle closer to the diaphragm edge is longer. When the working pressure difference generates an outward pull-out tendency, the shorter hypotenuse and the concave ring wall generate significant deformation resistance, forming a mechanical self-lock, effectively preventing the diaphragm from slipping out. During installation and disassembly, only the smaller resistance of the longer hypotenuse needs to be overcome, and the ease of assembly is not affected. At the same time, the locking protrusion on the inner side of the upper cover and the positioning protrusion on the lower cover together perform secondary compression and limiting on the outer edge of the diaphragm, further improving the clamping reliability.

[0017] 2. The inverted U-shaped arc structure formed on the inner side of the diaphragm protrusion ensures that the outer wall of the arc remains in contact with the inner wall of the upper cover as the diaphragm moves upward due to pressure difference. Furthermore, the highest point of the bend moves continuously radially as the diaphragm is lifted. This dynamic bending mechanism overcomes the drawbacks of traditional fixed-position repeated bending, effectively dispersing bending stress along the circumference and radial direction of the diaphragm, avoiding stress concentration, and thus significantly delaying the generation of rubber fatigue cracks and extending the working life of the diaphragm.

[0018] 3. The inner edge of the diaphragm is installed in the annular groove of the mounting plate. A second convex ring with a non-isosceles triangular cross section and a longer inner edge fits tightly with the second concave ring, and a sealing ring is added. When the diaphragm is subjected to tension or thrust, the convex ring and the concave ring generate a wedge effect, which can stably lock the inner edge position and prevent it from relative displacement with the annular groove, ensuring the long-term sealing of the air chamber separation and further enhancing the stability of the system during repeated braking.

[0019] 4. The stiffeners of the upper cover, mounting base, and lower cover are pre-embedded with a continuous fiber skeleton formed by upper wire harness, lower wire harness, and ring wire harness anchored by fixing posts. This skeleton is completely integrated with the plastic matrix during molding. When the stiffener is subjected to bending load, the fiber wire harness bears the main tensile stress, which greatly improves the bending stiffness and impact toughness of the stiffener, effectively inhibits crack propagation, and enables the lightweight shell to maintain structural integrity under long-term vacuum alternating stress, preventing fit failure caused by shell deformation.

[0020] 5. The stiffening plates on the top cover, mounting base, and bottom cover are arranged in a reasonable manner in the form of radial, coaxial, and cross grids, which work together with the internal fiber skeleton to form an efficient force transmission network. This makes the shell exhibit good rigidity in different force directions and meets the stringent requirements of lightweight electronic vacuum boosters for overall structural strength and durability without significantly increasing the weight. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0022] Figure 1 A 3D view of a lightweight electronic vacuum booster; Figure 2 A schematic diagram of the internal installation of a lightweight electronic vacuum booster; Figure 3 for Figure 1 Longitudinal sectional view of some parts; Figure 4 This is a bottom view of the top cover; Figure 5 This is a top view of the mounting bracket; Figure 6 This is a three-dimensional schematic diagram of the lower cover; Figure 7 This is a bottom view of the lower cover; Figure 8 for Figure 3 A magnified view of a portion of position A in the middle; Figure 9 for Figure 3 A magnified view of a portion of position B in the middle; Figure 10 This is a structural schematic diagram of the reinforcement section; Figure 11 for Figure 10 A magnified view of the area at position C.

[0023] Explanation of reference numerals in the attached figures: 101-Fasting bolt, 102-Return spring, 103-Push rod, 104-Ejector pin, 105-Dust cover, 106-Sealing ring, 200-Top cover, 201-One-way valve, 202-First rib, 203-Second rib, 204-Third rib, 205-Locking protrusion, 300-Diaphragm, 301-First convex ring, 302-First concave ring, 303-Arc portion, 304-Second convex ring, 305-Second concave ring, 400-Mounting base, 410-Mounting plate, 411-Fourth Rib plate, 412-Fifth rib plate, 413-Sixth rib plate, 414-Annular groove, 415-Sealing ring, 416-Sliding seat, 420-Mounting cylinder, 500-Lower cover, 501-Positioning ring, 502-Positioning protrusion, 503-Mounting sleeve, 504-Seventh rib plate, 505-Eighth rib plate, 506-Ninth rib plate, 600-Mounting base, 700-Valve body assembly, 800-Reinforcing part, 801-Upper wire harness, 802-Lower wire harness, 803-Annular wire harness, 804-Fixing post. Detailed Implementation

[0024] To make the objectives, technical solutions, and technical effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] See Figures 1-3The lightweight electronic vacuum booster consists of an upper cover 200, a lower cover 500, and a mounting base 600 arranged from top to bottom. The three are coaxially arranged and fixed together as a whole by at least two fastening bolts 101 that pass through them. All three are made of lightweight material, preferably polyethylene terephthalate. The upper cover 200 and the lower cover 500 constitute the internal cavity of the vacuum booster. The mounting base 600 is located at the bottom of the lower cover 500. A diaphragm 300 and a mounting seat 400 are installed inside the upper cover 200 and the lower cover 500, respectively. The diaphragm 300 and the mounting seat 400 divide the internal cavity of the booster into two air chambers. For ease of expression and description, the air chamber closer to the upper cover 200 is referred to as the upper air chamber, and the air chamber closer to the lower cover 500 is referred to as the lower air chamber.

[0026] The outer edge of the diaphragm 300 is sealed and clamped between the upper cover 200 and the lower cover 500. The inner edge of the diaphragm 300 is sealed and connected to the mounting base 400. The mounting base 400 includes a mounting plate 410 and a mounting cylinder 420 that are coaxially fixed. The mounting plate 410 is fixed to the top outer side of the mounting cylinder 420. A return spring 102 is installed between the mounting plate 410 and the upper cover 200. A valve body assembly 700 is installed inside the mounting cylinder 420. A push rod 103 is provided at the bottom of the valve body assembly 700. The push rod 103 is connected to the brake pedal and is used to receive the driver's braking force. A pin 104 is provided at the top of the valve body assembly 700. The pin 104 passes through the middle of the upper cover 200 and is connected to the piston of the brake pump to push the brake pump piston to complete the braking.

[0027] The valve body assembly 700 is used to switch the air path and has two working states: in the non-braking state, the valve body assembly 700 connects the upper air chamber and the lower air chamber and disconnects the lower air chamber from the outside; in the braking state, the valve body assembly 700 disconnects the upper air chamber and the lower air chamber and connects the lower air chamber to the outside. In this way, the pressure difference between the upper and lower air chambers is changed by the intermittent control of the valve body assembly 700, thereby providing braking assistance. In addition, since the specific structure of the valve body assembly 700, the matching relationship of each valve port and the assembly method are all mature technologies in this field, they will not be described in detail here.

[0028] A dust cover 105 is installed on the outside of the mounting cylinder 420 to block external impurities and prevent them from entering the valve body assembly 700, thereby affecting the normal flow of air and the switching of air paths within the valve body assembly 700.

[0029] For a further explanation of the above embodiments, see Figure 1 , Figure 4A one-way valve 201 is fixedly installed on the top of the upper cover 200. The one-way valve 201 is connected to the internal cavity of the vacuum booster and to the vacuum pump. It is used to provide negative pressure to the internal cavity of the vacuum booster. Several ribs are provided on the side of the upper cover 200 near the internal cavity of the vacuum booster, including a first rib 202, a second rib 203 and a third rib 204. Several first ribs 202 are arranged radially along the upper cover 200 and evenly distributed circumferentially. Several second ribs 203 are coaxially arranged with the upper cover 200 and evenly distributed radially. The third rib 204 has a rectangular outline and two sets of third ribs 204 are provided. The two sets of third ribs 204 are arranged vertically and simultaneously coaxial with the upper cover 200.

[0030] For a further explanation of the above embodiments, see Figure 3 , Figure 5 The mounting base 400 is made of lightweight material, preferably polyethylene terephthalate. The mounting plate 410 is provided with a number of ribs on the side near the top cover 200, including a fourth rib 411, a fifth rib 412 and a sixth rib 413. The number of fourth ribs 411 are arranged radially along the mounting plate 410 and are evenly distributed circumferentially along the mounting plate 410. The number of fifth ribs 412 are coaxially arranged with the mounting plate 410 and are evenly distributed radially. The number of sixth ribs 413 are arranged between the two innermost fifth ribs 412. Every two intersecting sixth ribs 413 form a group. Multiple groups of this intersecting structure are evenly arranged circumferentially along the mounting plate 410.

[0031] For a further explanation of the above embodiments, see Figure 2 , Figure 3 , Figure 6 , Figure 7 , Figure 8 A positioning ring 501 is coaxially fixedly installed on the outer edge of the lower cover 500. The inner side of the positioning ring 501 fits against the outer edge of the upper cover 200 to achieve positioning when the upper cover 200 and the lower cover 500 are installed. A positioning protrusion 502 is provided on the top of the lower cover 500 and is coaxially fixed with the lower cover 500. The positioning protrusion 502 and the upper cover 200 together complete the clamping of the outer edge of the diaphragm 300 to achieve the installation of the diaphragm 300. At least two mounting sleeves 503 are fixedly installed inside the lower cover 500. A fastening bolt 101 is provided inside the mounting sleeve 503. The top of the mounting sleeve 503 is correspondingly set in the recess on the upper cover 200. A sealing ring 106 is provided between the top of the mounting sleeve 503 and the recess on the upper cover 200 to seal the gap when the mounting sleeve 503 and the recess are connected.

[0032] See Figure 2The outer sealing sliding sleeve of the mounting sleeve 503 is provided with a sliding seat 416 that reciprocates along its axial direction. The sliding seat 416 is fixedly installed on the mounting plate 410. Two sets of mating components between the mounting sleeve 503 and the sliding seat 416 are provided to guide the reciprocating sliding of the mounting plate 410.

[0033] The bottom of the lower cover 500 is provided with several stiffening plates, including a seventh stiffening plate 504, an eighth stiffening plate 505 and a ninth stiffening plate 506. The seventh stiffening plates 504 are arranged radially along the lower cover 500 and are evenly distributed circumferentially along the lower cover 500. The eighth stiffening plates 505 are arranged coaxially with the lower cover 500 and are evenly distributed radially along the lower cover 500. The ninth stiffening plate 506 has a square outline and there are two sets of the ninth stiffening plates 506. The two sets of the ninth stiffening plates 506 are arranged at a 45-degree angle and are coaxial with the lower cover 500.

[0034] For a further explanation of the above embodiments, see Figure 3 , Figure 8 Several first protruding rings 301 are fixedly provided on both the inner and outer sides of the outer edge of the diaphragm 300. The cross-sectional shape of the first protruding ring 301 is a non-isosceles triangle with rounded apex. The side of the non-isosceles triangle closest to the outer edge of the diaphragm 300 is longer. The outer surface of the outer edge of the diaphragm 300 is in contact with the inner surface of the upper cover 200. The inner surface of the outer edge of the diaphragm 300 is in contact with the outer surface of the positioning protrusion 502. Several first concave rings 302 that cooperate with the first protruding rings 301 are provided on both the inner surface of the upper cover 200 and the outer surface of the positioning protrusion 502.

[0035] See Figure 8 After the vacuum booster is installed, a locking protrusion 205 is provided on the inner side of the upper cover 200, directly above the positioning protrusion 502. The locking protrusion 205 corresponds to the top of the positioning protrusion 502, thereby compressing the diaphragm 300 and fixing its position. In addition, when a pressure difference occurs between the upper and lower air chambers, causing the diaphragm 300 to move, the outer edge of the diaphragm 300 tends to slide out of the gap between the upper cover 200 and the lower cover 500 under stress. At this time, the cooperation of several sets of first convex rings 301 and first concave rings 302 can limit the displacement of the outer edge of the diaphragm 300. The non-isosceles triangular design of the cross-sectional shape of the first convex ring 301 means that when the first convex ring 301 moves outward from the first concave ring 302, it needs to overcome a large deformation resistance. However, during installation and disassembly, it only needs to overcome a small deformation resistance. This structural design enables the outer edge of the diaphragm 300 to achieve self-locking during the operation of the vacuum booster, thereby increasing the structural stability.

[0036] In addition, the diaphragm 300 is provided with an inverted U-shaped arc 303 on the inner side of the locking protrusion 205. This structure can be achieved by controlling the radial length of the diaphragm 300. Through the design of this inverted U-shaped structure, when a pressure difference is formed between the upper and lower air chambers, causing the entire diaphragm 300 to move upward, the outer side of the inverted U-shaped structure will always be in close contact with the inner wall of the upper cover 200. Furthermore, the top of the inverted U-shaped structure continuously rises as the diaphragm 300 moves upward. That is, the highest point of the inverted U-shaped structure moves radially along the diaphragm 300, rather than bending on the fixed annular band of the diaphragm 300. This makes the stress on the diaphragm 300 more scientific, reduces the risk of fatigue fracture at the fixed position, and thus effectively extends the service life of the diaphragm 300.

[0037] For a further explanation of the above embodiments, see Figure 3 , Figure 9 The inner edge of the diaphragm 300 is located in an annular groove 414 formed at the bottom outer side of the mounting plate 410. The innermost side of the annular groove 414 and the inner edge of the diaphragm 300 are connected to form an installation groove. A sealing ring 415 is provided in the installation groove to seal the gap between the inner edge of the diaphragm 300 and the annular groove 414 after installation. Several second convex rings 304 are provided on both the upper and lower sides of the inner edge of the diaphragm 300. The second convex rings 304 have the same structure as the first convex rings 301. The cross-sectional shape of the second convex rings 304 is also a non-isosceles triangle with rounded apex corners. The side of the non-isosceles triangle closest to the inner edge of the diaphragm 300 is longer. Several second concave rings 305 corresponding to the second convex rings 304 are provided on the upper and lower surfaces of the annular groove 414.

[0038] In the above structure, after the inner edge of the diaphragm 300 is installed inside the annular groove 414, its own elasticity forces the inner edge of the diaphragm 300 to fit tightly against the inner surface of the annular groove 414. At the same time, combined with the sealing effect of the sealing ring 415, the inner edge of the diaphragm 300 and the annular groove 414 are sealed together.

[0039] In addition, during the operation of the diaphragm 300, the cooperation of the second convex ring 304 and the second concave ring 305 can also limit the relative displacement between the inner edge of the diaphragm 300 and the annular groove 414, ensuring the stability of the fixed position of the inner edge of the diaphragm 300.

[0040] For a further explanation of the above embodiments, see Figure 10 , Figure 11The stiffeners on the upper cover 200, mounting base 400, and lower cover 500 are equipped with reinforcing parts 800 to further enhance the strength and toughness of these components. The reinforcing part 800 includes an upper wire harness 801, a lower wire harness 802, an annular wire harness 803, and a fixing post 804. The lower wire harness 802 is located inside the stiffener on the side closer to the main body, while the upper wire harness 801 is located inside the stiffener on the side farther from the main body. The upper and lower wire harnesses 801 are aligned vertically. Additionally, the annular stiffener contains two layers of annular wire harnesses 803 aligned vertically. The upper ring wire harness 803 is at the same horizontal level as the upper wire harness 801, and the lower ring wire harness 803 is at the same horizontal level as the lower wire harness 802. Several fixing posts 804 are fixed on the skeleton formed by the upper wire harness 801, the lower wire harness 802, and the ring wire harness 803. The fixing posts 804 are vertically arranged and located at the intersection of the upper wire harness 801, the lower wire harness 802, and the ring wire harness 803. They are used to anchor the upper wire harness 801, the lower wire harness 802, and the ring wire harness 803 in stages to maintain the stability of the skeleton formed by the upper wire harness 801, the lower wire harness 802, and the ring wire harness 803.

[0041] Among them, the upper wire harness 801, the lower wire harness 802 and the ring wire harness 803 are fiber wire harnesses formed by winding carbon fiber, glass fiber and other materials, and the fixing post 804 is made of polyethylene terephthalate, which is convenient to integrate with the main body of the part.

[0042] During the molding process of the above-mentioned parts, the fiber bundle skeleton and the rib plate are integrated by pre-embedding in the molding mold, thereby improving the strength and toughness of the rib plate.

[0043] It should be understood that the embodiments of the present invention described above do not exhaustively describe all details, nor does it mean that the present invention is limited to the specific embodiments disclosed. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lightweight electronic vacuum booster, comprising an upper cover (200), a lower cover (500), and a mounting base (600), wherein the upper cover (200) and the lower cover (500) are fixedly connected and together form an internal cavity, the mounting base (600) is fixed to the bottom of the lower cover (500), a positioning protrusion (502) is provided on the top of the lower cover (500), the outer edge of a diaphragm (300) is held between the inner surface of the upper cover (200) and the outer surface of the positioning protrusion (502), the diaphragm (300) divides the internal cavity into an upper air chamber and a lower air chamber, an axially movable mounting seat (400) is provided in the internal cavity, the inner edge of the diaphragm (300) is sealed to the mounting seat (400), and a valve body assembly (700) for switching air paths is installed in the mounting seat (400), characterized in that: The inner and outer surfaces of the outer edge of the diaphragm (300) are provided with a first protruding ring (301), and the inner surface of the upper cover (200) and the outer surface of the positioning protrusion (502) are provided with a first concave ring (302) that cooperates with the first protruding ring (301). The cross section of the first protruding ring (301) is a non-isosceles triangle, and the side length of the non-isosceles triangle closer to the outer edge of the diaphragm (300) is greater than the side length away from the outer edge. The inner side of the upper cover (200) is also provided with a locking protrusion (205) corresponding to the positioning protrusion (502). The locking protrusion (205) and the positioning protrusion (502) together squeeze the diaphragm (300), so that the diaphragm (300) forms an inverted U-shaped arc (303) on the inner side of the locking protrusion (205). When the diaphragm (300) moves axially, the highest point of the bending of the arc (303) can change its position along the radial direction of the diaphragm (300). The upper cover (200), lower cover (500) and mounting base (400) are provided with stiffening plates, and the interior of the stiffening plates is provided with reinforcing parts (800). The reinforcing parts (800) include a skeleton made of fiber bundles, and the skeleton is fused and fixed with the base material of the stiffening plates.

2. The lightweight electronic vacuum booster according to claim 1, characterized in that, The mounting base (400) includes a mounting plate (410) and a mounting cylinder (420) fixed coaxially. An annular groove (414) is provided on the bottom outer side of the mounting plate (410). The inner edge of the diaphragm (300) is placed in the annular groove (414). The innermost side of the annular groove (414) and the inner edge of the diaphragm (300) together form a mounting groove. A sealing ring (415) is provided in the mounting groove. A second convex ring (304) is provided on the upper and lower surfaces of the inner edge of the diaphragm (300). A second concave ring (305) that mates with the second convex ring (304) is provided on the upper and lower surfaces of the annular groove (414). The cross-section of the second convex ring (304) is a non-isosceles triangle and the side length of the side closer to the inner edge of the diaphragm (300) is greater than the side length of the side away from the inner edge.

3. The lightweight electronic vacuum booster according to claim 1, characterized in that, The skeleton of the reinforcing part (800) includes an upper wire harness (801), a lower wire harness (802), a ring wire harness (803), and a fixing post (804). The upper wire harness (801) is located inside the side of the rib plate away from the main body it is connected to, and the lower wire harness (802) is located inside the side of the rib plate close to the main body it is connected to. The upper wire harness (801) and the lower wire harness (802) are aligned vertically. The ring wire harness (803) is located inside the rib plate that extends in a ring shape and is divided into upper and lower layers. The upper ring wire harness is flush with the upper wire harness (801), and the lower ring wire harness is flush with the lower wire harness (802). The fixing post (804) is vertically arranged and fixed at the intersection of the upper wire harness (801), the lower wire harness (802), and the ring wire harness (803).

4. The lightweight electronic vacuum booster according to claim 3, characterized in that, The upper wire harness (801), lower wire harness (802) and annular wire harness (803) are formed by winding carbon fiber or glass fiber, and the fixing post (804) is made of polyethylene terephthalate.

5. The lightweight electronic vacuum booster according to claim 1, characterized in that, The ribs on the upper cover (200) include a first rib (202), a second rib (203) and a third rib (204). The first rib (202) is arranged radially along the upper cover (200) and is evenly distributed circumferentially. The second rib (203) is coaxially arranged with the upper cover (200) and is evenly distributed radially. The third rib (204) has a rectangular outline and is provided in two sets. The two sets of third ribs (204) are perpendicular to each other and are both coaxial with the upper cover (200).

6. The lightweight electronic vacuum booster according to claim 1, characterized in that, The mounting plate (410) of the mounting base (400) is provided with a fourth rib (411), a fifth rib (412) and a sixth rib (413) on its upper surface. The fourth rib (411) is arranged radially along the mounting plate (410) and is evenly distributed circumferentially. The fifth rib (412) is coaxially arranged with the mounting plate (410) and is evenly distributed radially. The sixth rib (413) is arranged between the two innermost fifth ribs (412) along the radial direction. Each pair of intersecting sixth ribs (413) forms a group and multiple groups are evenly distributed circumferentially.

7. The lightweight electronic vacuum booster according to claim 1, characterized in that, A positioning ring (501) is coaxially fixed to the outer edge of the lower cover (500), and the inner side of the positioning ring (501) is in contact with the outer edge of the upper cover (200). At least two mounting sleeves (503) are fixed inside the lower cover (500), and fastening bolts (101) are inserted inside the mounting sleeves (503). Corresponding recesses are provided on the upper cover (200), and the top of the mounting sleeves (503) extends into the recesses. A sealing ring (106) is provided between the top of the mounting sleeves (503) and the recesses.

8. The lightweight electronic vacuum booster according to claim 1, characterized in that, The bottom of the lower cover (500) is provided with a seventh rib (504), an eighth rib (505) and a ninth rib (506). The seventh rib (504) is arranged radially along the lower cover (500) and is evenly distributed circumferentially. The eighth rib (505) is coaxially arranged with the lower cover (500) and is evenly distributed radially. The ninth rib (506) has a square outline and is provided in two sets. The two sets of ninth ribs (506) are at a 45-degree angle and are both coaxial with the lower cover (500).

9. The lightweight electronic vacuum booster according to claim 1, characterized in that, The bottom of the valve body assembly (700) is connected to a push rod (103), and the top of the valve body assembly (700) is provided with a push pin (104), which seals through the middle of the upper cover (200).

10. The lightweight electronic vacuum booster according to claim 1, characterized in that, A one-way valve (201) is fixedly installed on the top of the cover (200), and the one-way valve (201) is connected to the internal cavity; a return spring (102) is installed between the mounting base (400) and the cover (200).

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