Aluminum shell of vacuum booster of automobile brake system

Abstract

The utility model relates to an aluminum shell of a vacuum booster of an automobile brake system, which comprises an aluminum rear shell on the vacuum booster, the rear shell comprises a horizontal annular central shell plate, an inner connecting ring plate is formed on the outer ring of the central shell plate, an outer connecting ring plate is formed on the outer ring of the inner connecting ring plate, and the outer connecting ring plate is connected with the central shell plate. A cylindrical-ring-shaped barrel plate is formed on the outer ring of the outer connecting ring plate, an L-shaped inner folding edge which is bent outwards is formed at the lower end of the barrel plate, a vertical outer folding edge which is bent downwards is formed on the outer ring of the inner folding edge, and an arc-shaped upward inner convex ring and an arc-shaped upward outer convex ring are formed on the upper surface of the inner ring and the upper surface of the outer ring of the outer connecting ring plate respectively. And a plurality of pits which are annularly distributed and sunken downwards are formed in the upper surface of the outer connecting ring plate between the inner convex ring and the outer convex ring. The upper surface of the aluminum shell is provided with the pits, the pits can improve the strength of the aluminum shell, meanwhile, the roughness of the upper surface of the aluminum shell can be increased, the nickel-aluminum coating can be sprayed and attached conveniently, and meanwhile the deformation resistance strength of the aluminum shell is improved through the performance of the nickel-aluminum coating.

Description

Technical Field

[0001] This utility model relates to the technical field of vacuum boosters, and more specifically to the aluminum housing of a vacuum booster for an automotive braking system. Background Technology

[0002] A vacuum booster is a component that uses vacuum (negative pressure) to increase the force applied by the driver to the pedal. Existing vacuum booster housings are primarily made of carbon steel. However, with the increasing demand for lightweight automotive designs, carbon steel housings have been replaced by aluminum alloy housings. For small booster housings, the alloy housing meets the strength requirements for resistance to deformation, but for some large booster housings, such as... Figure 1 The booster housing shown includes a front housing 10 and a rear housing 20. The front housing 10 is composed of multiple conical or planar ring plates, with the outermost conical ring plate being larger. When the front housing 10 deforms, the deformation is concentrated on the outermost conical ring plate. Therefore, it is necessary to design an effective deformation-resistant structure for its components to improve the deformation resistance of the front housing. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by providing an aluminum housing for a vacuum booster in an automotive braking system. The upper surface of the aluminum housing is machined with recesses, which can improve the strength of the aluminum housing and increase the roughness of the upper surface of the aluminum housing, facilitating the adhesion of the nickel-aluminum coating. At the same time, the performance of the nickel-aluminum coating can be used to improve the deformation resistance of the aluminum housing.

[0004] The aluminum housing of the vacuum booster of the automotive braking system includes an aluminum rear housing of the vacuum booster. The rear housing includes a horizontal annular central housing plate. The inner ring of the central housing plate is formed with a push rod bushing, and the outer ring is formed with a conical inner connecting ring plate. The outer ring of the inner connecting ring plate is formed with a conical outer connecting ring plate. The outer ring of the outer connecting ring plate is formed with a cylindrical annular plate. The lower end of the cylindrical plate is formed with an outwardly bent L-shaped inner folded edge. The outer ring of the inner folded edge is formed with a downwardly bent vertical outer folded edge. The upper surfaces of the inner and outer rings of the outer connecting ring plate are respectively formed with an arc-shaped upward inner convex ring and an outer convex ring. The upper surface of the outer connecting ring plate between the inner convex ring and the outer convex ring is formed with several annularly distributed and downwardly recessed dimples.

[0005] The outer connecting ring plate between the inner and outer convex rings is coated with a nickel-aluminum coating. The lower surface of the nickel-aluminum coating is attached and fixed to the bottom surface of the recess, and the upper surface of the nickel-aluminum coating is flush with the upper ends of the inner and outer convex rings, respectively.

[0006] Preferably, the distance between the inner and outer rings of the outer connecting ring plate is greater than the distance from the outer ring of the inner connecting ring plate to the outer wall of the push rod bushing, and the taper of the outer connecting ring plate is smaller than the taper of the inner connecting ring plate.

[0007] Preferably, the thicknesses of the central shell plate, push rod bushing, inner connecting ring plate, outer connecting ring plate, cylindrical plate, inner folded edge, and outer folded edge are consistent, the length of the inner folded edge is less than the length of the cylindrical plate, the bending surface between the inner folded edge and the cylindrical plate is a semi-circular surface, the gap between the inner folded edge and the cylindrical plate is less than the thickness of the cylindrical plate, and the thickness of the outer folded edge is equal to the length of the outer folded edge.

[0008] Preferably, the depth of the recess is less than half the thickness of the inner connecting ring plate; the recesses are evenly distributed in a ring around the central axis of the outer connecting ring plate.

[0009] Preferably, the thickness of the nickel-aluminum coating is less than half the thickness of the inner connecting ring plate.

[0010] Preferably, an arc-shaped reinforcing groove is formed between the inner connecting ring plate and the push rod bushing.

[0011] The beneficial effects of this utility model are as follows:

[0012] The upper surface of this aluminum shell is machined with recesses, which can improve the strength of the aluminum shell and increase the roughness of the upper surface of the aluminum shell, which facilitates the adhesion of the nickel-aluminum coating. At the same time, the performance of the nickel-aluminum coating can improve the deformation resistance of the aluminum shell. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of an existing aluminum vacuum booster.

[0014] Figure 2 This is a half-sectional schematic diagram of the aluminum shell of this utility model;

[0015] Figure 3 This is a three-dimensional structural diagram of the uncoated aluminum shell of this utility model.

[0016] In the figure: 10. Rear housing; 11. Front housing; 1. Center shell plate; 2. Push rod bushing; 3. Inner connecting ring plate; 4. Outer connecting ring plate; 41. Inner convex ring; 42. Outer convex ring; 43. Recess; 5. Cylindrical plate; 6. Inner folded edge; 7. Outer folded edge; 8. Nickel-aluminum coating; 9. Reinforcing rib groove. Detailed Implementation

[0017] Example: See Figure 2 , 3As shown, the aluminum housing (made of aluminum alloy) of the vacuum booster of the automotive braking system includes an aluminum rear housing of the vacuum booster. The rear housing includes a horizontal annular central shell plate 1. The inner ring of the central shell plate 1 is formed with a push rod bushing 2, and the outer ring is formed with a conical inner connecting ring plate 3. The outer ring of the inner connecting ring plate 3 is formed with a conical outer connecting ring plate 4. The outer ring of the outer connecting ring plate 4 is formed with a cylindrical annular cylinder plate 5. The lower end of the cylinder plate 5 is formed with an outwardly bent and L-shaped inner folded edge 6. The outer ring of the inner folded edge 6 is formed with a downwardly bent and vertical outer folded edge 7. The upper surfaces of the inner and outer rings of the outer connecting ring plate 4 are respectively formed with an arc-shaped upward inner convex ring 41 and an outer convex ring 42. The upper surface of the outer connecting ring plate 4 between the inner convex ring 41 and the outer convex ring 42 is formed with a number of annularly distributed and downwardly recessed recesses 43.

[0018] The outer connecting ring plate 4 between the inner convex ring 41 and the outer convex ring 42 is coated with a nickel-aluminum coating 8. The lower surface of the nickel-aluminum coating 8 is attached and fixed to the bottom surface of the recess 43. The upper surface of the nickel-aluminum coating 8 is flush with the upper ends of the inner convex ring 41 and the outer convex ring 42, respectively.

[0019] The distance between the inner and outer rings of the outer connecting ring plate 4 is greater than the distance from the outer ring of the inner connecting ring plate 3 to the outer wall of the push rod bushing 2. The taper of the outer connecting ring plate 4 is smaller than that of the inner connecting ring plate 3, meaning that the area of ​​the outer connecting ring plate 4 is larger, and deformation is more likely to occur here.

[0020] The thicknesses of the central shell plate 1, push rod bushing 2, inner connecting ring plate 3, outer connecting ring plate 4, cylindrical plate 5, inner folded edge 6, and outer folded edge 7 are consistent. The length of the inner folded edge 6 is less than the length of the cylindrical plate 5. The bending surface between the inner folded edge 6 and the cylindrical plate 5 is a semi-circular surface. The gap between the inner folded edge 6 and the cylindrical plate 5 is less than the thickness of the cylindrical plate 5. The thickness of the outer folded edge 7 is equal to the length of the outer folded edge 7. The lengths of the inner folded edge 6 and the outer folded edge 7 are minimized as much as possible to reduce weight. The dimensions of the outer folded edge 7 cannot be formed by stamping, but can be formed by extrusion.

[0021] The depth of the recess 43 is less than half the thickness of the inner connecting ring plate 3. The recesses 43 are evenly distributed in a ring around the central axis of the outer connecting ring plate 4. The recesses 43 are essentially concave points, which are evenly distributed on the upper surface of the outer connecting ring plate 4. This can increase the roughness of the upper surface of the outer connecting ring plate 4, which facilitates the adhesion and fixation of the nickel-aluminum coating 8. If the size of the recesses 43 increases, that is, if it is greater than half the thickness of the inner connecting ring plate 3, in order to ensure the thickness of the outer connecting ring plate 4, the distance between adjacent recesses 43 must be increased (otherwise the thickness between adjacent recesses 43 will be reduced). If the recesses 43 are enlarged, the increased distance will not have the effect of increasing the surface roughness.

[0022] The thickness of the nickel-aluminum coating 8 is less than half the thickness of the inner connecting ring plate 3. The nickel-aluminum coating 8 should not be too thick, otherwise it will increase the weight of the aluminum rear shell, which violates the requirement of lightweighting.

[0023] An arc-shaped reinforcing groove 9 is formed between the inner connecting ring plate 3 and the push rod bushing 2 to improve the deformation resistance between the inner connecting ring plate 3 and the push rod bushing 2.

[0024] Working principle: This structure is an aluminum housing of a vacuum booster for automotive brake systems. Its specific component is the front housing 10. A recess 43 is added to the outer connecting ring plate 4 of the front housing 10, which is prone to deformation. The recess 43 can be stamped together with the protrusions on the die during stamping. The recess 43 has the function of a rib groove, which can improve the strength of the outer connecting ring plate 4.

[0025] Meanwhile, the recess 43 can provide an adhesion base for the sprayed nickel-aluminum coating 8. The inner and outer sides of the nickel-aluminum coating 8 are limited by convex rings to prevent the nickel-aluminum coating 8 from peeling off from the inner and outer sides.

[0026] The embodiments described above are illustrative of the present invention and are not intended to limit the present invention. Any person skilled in the art can modify the embodiments without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be as set forth in the claims.

Claims

1. An aluminum housing for a vacuum booster in an automotive braking system, comprising an aluminum rear housing for the vacuum booster, the rear housing comprising a horizontal annular central housing plate (1), the inner ring of the central housing plate (1) having a push rod bushing (2) formed thereon, the outer ring having a conical inner connecting ring plate (3) formed thereon, the outer ring of the inner connecting ring plate (3) having a conical outer connecting ring plate (4) formed thereon, the outer ring of the outer connecting ring plate (4) having a cylindrical annular plate (5) formed thereon, the lower end of the plate (5) having an outwardly bent and L-shaped inner folded edge (6), the outer ring of the inner folded edge (6) having a downwardly bent and vertical outer folded edge (7), characterized in that: The inner and outer rings of the outer connecting ring plate (4) are respectively formed with an arc-shaped upward inner convex ring (41) and an outer convex ring (42). The outer connecting ring plate (4) between the inner convex ring (41) and the outer convex ring (42) has several ring-shaped and downward recessed dimples (43) formed on its upper surface. The outer connecting ring plate (4) between the inner convex ring (41) and the outer convex ring (42) is coated with a nickel-aluminum coating (8). The lower surface of the nickel-aluminum coating (8) is attached and fixed to the bottom surface of the recess (43). The upper surface of the nickel-aluminum coating (8) is flush with the upper ends of the inner convex ring (41) and the outer convex ring (42).

2. The aluminum housing of the vacuum booster for an automotive braking system according to claim 1, characterized in that: The distance between the inner and outer rings of the outer connecting ring plate (4) is greater than the distance from the outer ring of the inner connecting ring plate (3) to the outer wall of the push rod bushing (2), and the taper of the outer connecting ring plate (4) is less than the taper of the inner connecting ring plate (3).

3. The aluminum housing of the vacuum booster for an automotive braking system according to claim 1, characterized in that: The thicknesses of the central shell plate (1), push rod bushing (2), inner connecting ring plate (3), outer connecting ring plate (4), cylindrical plate (5), inner folded edge (6) and outer folded edge (7) are consistent. The length of the inner folded edge (6) is less than the length of the cylindrical plate (5). The bending surface between the inner folded edge (6) and the cylindrical plate (5) is a semi-circular surface. The gap between the inner folded edge (6) and the cylindrical plate (5) is less than the thickness of the cylindrical plate (5). The thickness of the outer folded edge (7) is equal to the length of the outer folded edge (7).

4. The aluminum housing of the vacuum booster for an automotive braking system according to claim 3, characterized in that: The depth of the recess (43) is less than half the thickness of the inner connecting ring plate (3); the recess (43) is evenly distributed in a ring around the central axis of the outer connecting ring plate (4).

5. The aluminum housing of the vacuum booster for an automotive braking system according to claim 3, characterized in that: The thickness of the nickel-aluminum coating (8) is less than half the thickness of the inner connecting ring plate (3).

6. The aluminum housing of the vacuum booster for an automotive braking system according to claim 1, characterized in that: An arc-shaped reinforcing groove (9) is formed between the inner connecting ring plate (3) and the push rod bushing (2).

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