Car body front wall reinforcing structure and mounting method

Abstract

The invention discloses an automobile body front wall reinforcing structure and an installation method.The automobile body front wall reinforcing structure comprises a front wall lower baffle, a vacuum booster and brake pump reinforcing plate, an accelerator pedal connecting and fixing plate and a front wall front longitudinal beam, and the front wall lower baffle is installed on an automobile; the vacuum booster with the brake pump reinforcing plate is connected to the front wall lower baffle, at least one first cavity is formed by the vacuum booster with the brake pump reinforcing plate and the front wall lower baffle, and the vacuum booster with the brake pump reinforcing plate is used for installing a brake pedal of an automobile. The accelerator pedal connecting and fixing plate is connected to the vacuum booster belt brake pump reinforcing plate, the accelerator pedal connecting and fixing plate and the vacuum booster belt brake pump reinforcing plate form a second cavity, and the accelerator pedal connecting and fixing plate is used for installing an accelerator pedal of the automobile; the front wall front longitudinal beam longitudinally spans the front wall lower baffle and is connected to the front wall lower baffle, and a third cavity is formed by the front wall front longitudinal beam and the front wall lower baffle. Through the arrangement of the first cavity, the second cavity and the third cavity, the requirements for light weight and cost reduction of the front wall structure of the automobile body are met.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and in particular to a vehicle body front wall reinforcement structure and an installation method thereof. Background Art

[0002] In the prior art, the accelerator pedal and the brake pedal are usually connected to the vehicle body by bolts, so a supporting and fixing structure needs to be designed at the corresponding position of the vehicle body to connect the vehicle body and the pedal. In addition, the mounting structure strength of the pedal on the vehicle body is required to be relatively high.

[0003] At present, in order to meet the requirements of structural strength, the installation structure is usually achieved by increasing the thickness of parts and improving the material grade. However, this approach will increase the weight and cost of the car body and cannot meet the requirements of lightweight and cost reduction. Summary of the invention

[0004] The purpose of the present invention is to provide a vehicle body front reinforcement structure and installation method, aiming to solve the problem that the existing vehicle body increases the installation structure strength of the pedal by increasing the thickness of the components and improving the material grade, which leads to the vehicle body front structure being unable to meet the requirements of lightweight and cost reduction.

[0005] To solve the above technical problems, an embodiment of the present invention provides a vehicle body front panel reinforcement structure for installation on an automobile, comprising: a front panel lower panel, a vacuum booster with brake pump reinforcement plate, an accelerator pedal connection and fixing plate and a front panel front longitudinal beam, wherein the front panel lower panel is installed on the automobile; the vacuum booster with brake pump reinforcement plate is connected to the front panel lower panel, and forms at least one first cavity with the front panel lower panel, and the vacuum booster with brake pump reinforcement plate is used to install the brake pedal of the automobile; the accelerator pedal connection and fixing plate is connected to the vacuum booster with brake pump reinforcement plate, and forms a second cavity with the vacuum booster with brake pump reinforcement plate, and the accelerator pedal connection and fixing plate is used to install the accelerator pedal of the automobile; the front panel front longitudinal beam spans the front panel lower panel, is connected to the front panel lower panel, and forms a third cavity with the front panel lower panel.

[0006] Furthermore, the front lower baffle and the vacuum booster with brake pump reinforcement plate at both ends of the first cavity are connected by welding.

[0007] Furthermore, the accelerator pedal connection fixing plate and the vacuum booster with brake pump reinforcement plate at both ends of the second cavity are connected by welding.

[0008] Furthermore, one end of the front longitudinal beam of the front dash is connected to the front dash lower baffle, and the other end is connected to an end of the vacuum booster with brake pump reinforcement plate close to the front longitudinal beam of the front dash.

[0009] Furthermore, one end of the front longitudinal beam of the front enclosure at one end of the third cavity and the front lower baffle are connected by welding, and the front lower baffle, the vacuum booster with brake pump reinforcement plate and the other end of the front longitudinal beam of the front enclosure at the other end of the third cavity are connected in sequence by welding.

[0010] Furthermore, an escape opening is provided between the other end of the front longitudinal beam of the front enclosure and the accelerator pedal connection fixing plate.

[0011] Furthermore, the vehicle body front wall reinforcement structure also includes: a steering column pore cover, which is connected to the front wall lower baffle and is used to install the steering column of the car.

[0012] Furthermore, the front lower baffle, the steering column hole cover and the vacuum booster with brake pump reinforcement plate are connected in sequence by welding.

[0013] The present invention also provides a method for installing a vehicle body front wall reinforcement structure, comprising:

[0014] Install the cowl lower fender on the vehicle;

[0015] Connecting the steering column escutcheon to the lower front fender;

[0016] The vacuum booster with brake pump reinforcement plate is connected to the front lower baffle plate, and forms at least one first cavity with the front lower baffle plate;

[0017] Connecting the accelerator pedal connection fixing plate to the vacuum booster with brake pump reinforcement plate, and forming a second cavity with the vacuum booster with brake pump reinforcement plate;

[0018] The dash front longitudinal beam is connected to the dash lower baffle plate and forms a third cavity with the dash lower baffle plate.

[0019] Furthermore, the method for installing the vehicle body front wall reinforcement structure also includes:

[0020] Welding the steering column escutcheon to the lower front baffle;

[0021] Connecting the front lower baffle and the vacuum booster with brake pump reinforcement plate at both ends of the first cavity by welding;

[0022] Connecting the accelerator pedal connection fixing plate and the vacuum booster with brake pump reinforcement plate at both ends of the second cavity by welding;

[0023] One end of the front longitudinal beam of the front enclosure at one end of the third cavity and the front lower baffle are connected by welding, and the front lower baffle, the vacuum booster with brake pump reinforcement plate and the other end of the front longitudinal beam of the front enclosure at the other end of the third cavity are connected in sequence by welding.

[0024] The embodiment of the present invention discloses a vehicle body front wall reinforcement structure and an installation method, wherein the vehicle body front wall reinforcement structure is used to be installed on a car, and includes: a front wall lower baffle, a vacuum booster with brake pump reinforcement plate, an accelerator pedal connection fixing plate and a front wall front longitudinal beam, the front wall lower baffle is installed on the car; the vacuum booster with brake pump reinforcement plate is connected to the front wall lower baffle, and forms at least one first cavity with the front wall lower baffle, the vacuum booster with brake pump reinforcement plate is used to install the brake pedal of the car; the accelerator pedal connection fixing plate is connected to the vacuum booster with brake pump reinforcement plate, and forms a second cavity with the vacuum booster with brake pump reinforcement plate, the accelerator pedal connection fixing plate is used to install the accelerator pedal of the car; the front wall front longitudinal beam spans the front wall lower baffle, is connected to the front wall lower baffle, and forms a third cavity with the front wall lower baffle. The present invention increases the installation structure strength of the pedal through the vacuum booster with brake pump reinforcement plate, the accelerator pedal connection fixing plate and the front wall front longitudinal beam, and realizes the requirements of lightweight and cost reduction of the vehicle body front wall structure through the provision of the first cavity, the second cavity and the third cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0026] Figure 1 A schematic structural diagram of a vehicle body front wall reinforcement structure from a first viewing angle provided by an embodiment of the present invention;

[0027] Figure 2 A schematic structural diagram of a vehicle body front wall reinforcement structure from a second viewing angle provided by an embodiment of the present invention;

[0028] Figure 3 A cross-sectional view AA provided for an embodiment of the present invention;

[0029] Figure 4 A cross-sectional view BB provided for an embodiment of the present invention;

[0030] Figure 5 A cross-sectional view CC provided for an embodiment of the present invention;

[0031] Figure 6 A partial diagram D provided for an embodiment of the present invention;

[0032] Figure 7 A schematic flow chart of a method for installing a vehicle body front wall reinforcement structure provided by an embodiment of the present invention;

[0033] Figure 8A schematic diagram of a sub-process of a method for installing a vehicle body front wall reinforcement structure provided in an embodiment of the present invention.

[0034] Description of the symbols in the figure:

[0035] 1. front lower baffle; 13. first connecting portion; 15. third connecting portion; 135. fourth connecting portion; 123. fifth connecting portion;

[0036] 2. Steering column escutcheon;

[0037] 3. Vacuum booster with brake pump reinforcement plate; 34. Second connecting part;

[0038] 4. Accelerator pedal connection fixing plate;

[0039] 5. Front longitudinal beam of front enclosure;

[0040] 6. The first cavity;

[0041] 7. Second cavity;

[0042] 8. The third cavity;

[0043] 9. Avoid the exit. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0046] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0047] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0048] Combination Figure 1-6 As shown, the present invention provides a vehicle body front wall reinforcement structure for installation on an automobile, comprising: a front wall lower baffle 1, a vacuum booster with brake pump reinforcement plate 3, an accelerator pedal connection fixing plate 4 and a front wall front longitudinal beam 5, wherein the front wall lower baffle 1 is installed on the automobile; the vacuum booster with brake pump reinforcement plate 3 is connected to the front wall lower baffle 1, and forms at least one first cavity 6 with the front wall lower baffle 1, and the vacuum booster with brake pump reinforcement plate 3 is used to install the brake pedal of the automobile; the accelerator pedal connection fixing plate 4 is connected to the vacuum booster with brake pump reinforcement plate 3, and forms a second cavity 7 with the vacuum booster with brake pump reinforcement plate 3, and the accelerator pedal connection fixing plate 4 is used to install the accelerator pedal of the automobile; the front wall front longitudinal beam 5 spans the front wall lower baffle 1, is connected to the front wall lower baffle 1, and forms a third cavity 8 with the front wall lower baffle 1.

[0049] In the embodiment of the present invention, the front lower baffle plate 1 is the main component that separates the cockpit and the cabin of the automobile, the steering column, the brake pedal and the accelerator pedal are fixed together on the front lower baffle plate 1, the vacuum booster with brake pump reinforcement plate 3 includes a vacuum booster and a brake pump, the vacuum booster is a device that uses engine vacuum to enhance the force of the brake pedal, the brake pump is a key component that converts the mechanical force of the brake pedal into fluid pressure, the vacuum booster and the brake pump are arranged in combination on the vacuum booster with brake pump reinforcement plate 3 for installing the brake pedal of the automobile, thereby enhancing the installation structural strength of the brake pedal, the accelerator pedal connection fixing plate 4 is used to install the accelerator pedal of the automobile, thereby enhancing the installation structural strength of the accelerator pedal, the front longitudinal beam 5 of the front baffle plate 1 spans the front lower baffle plate 1, thereby improving the overall strength of the front baffle reinforcement structure of the vehicle body; the first cavity 6 formed by the vacuum booster with brake pump reinforcement plate 3 and the front lower baffle plate 1, the second cavity 7 formed by the accelerator pedal connection fixing plate 4 and the vacuum booster with brake pump reinforcement plate 3, and the third cavity 8 formed by the front longitudinal beam 5 and the front lower baffle plate 1 meet the requirements of lightweight and cost reduction of the front wall structure of the automobile body.

[0050] Specifically, a plurality of reinforcing ribs (not shown) are arranged on the surface of the vacuum booster with brake pump reinforcing plate 3, and the reinforcing ribs and the front lower baffle 1 form at least one first cavity 6, and the reinforcing ribs enhance the strength of the front reinforcing structure of the vehicle body.

[0051] Specifically, the front longitudinal beam 5 of the front dash is arranged in the middle area of ​​the front dash lower baffle 1. Since the front dash lower baffle 1 has a large area, the middle area of ​​the front dash lower baffle 1 is not strong enough and is easy to deform without support. The structure of the front longitudinal beam 5 just makes up for the shortcomings of the structure of the front dash lower baffle 1.

[0052] More specifically, the accelerator pedal is arranged in the middle area of ​​the front dash lower panel 1. After the front dash front longitudinal beam 5 and the front dash lower panel 1 form a longitudinal third cavity 8, the overall strength of the front dash lower panel 1 is improved, which can effectively prevent the risk of shaking of the accelerator pedal.

[0053] In some embodiments, the front lower baffle 1 and the vacuum booster with brake pump reinforcement plate 3 at both ends of the first cavity 6 are connected by welding.

[0054] In this embodiment, the front lower baffle 1 and the vacuum booster with brake pump reinforcement plate 3 are connected together by welding, which not only ensures the sealing of the first cavity 6, but also enhances the connection strength of the front lower baffle 1 and the vacuum booster with brake pump reinforcement plate 3. In addition, the welding method has low cost and can enhance the strength of the front baffle of the vehicle body without increasing the thickness of the parts and improving the material grade, thereby enhancing the installation structure strength of the brake pedal. Specifically, the front lower baffle 1 and the vacuum booster with brake pump reinforcement plate 3 are welded to form a first connection portion 13.

[0055] In some embodiments, the accelerator pedal connection fixing plate 4 and the vacuum booster with brake pump reinforcement plate 3 at both ends of the second cavity 7 are connected by welding.

[0056] In this embodiment, the accelerator pedal connection fixing plate 4 and the vacuum booster with brake pump reinforcement plate 3 are connected together by welding, which not only ensures the sealing of the second cavity 7, but also enhances the connection strength of the accelerator pedal connection fixing plate 4 and the vacuum booster with brake pump reinforcement plate 3. In addition, the welding method has low cost and can enhance the strength of the front wall of the vehicle body without increasing the thickness of the parts and improving the material grade, thereby enhancing the installation structure strength of the accelerator pedal. Specifically, the accelerator pedal connection fixing plate 4 and the vacuum booster with brake pump reinforcement plate 3 at both ends of the second cavity 7 are welded to form a second connection portion 34.

[0057] In some embodiments, one end of the dash front longitudinal beam 5 is connected to the dash lower baffle 1 , and the other end is connected to the vacuum booster with brake pump reinforcement plate 3 close to one end of the dash front longitudinal beam 5 .

[0058] In this embodiment, the two ends of the front longitudinal beam 5 of the front wall are respectively connected to the front wall lower baffle 1 and the vacuum booster with brake pump reinforcement plate 3, thereby enhancing the overall strength of the vehicle body front wall reinforcement structure.

[0059] In some embodiments, one end of the front longitudinal beam 5 of the front enclosure at one end of the third cavity 8 and the front lower baffle 1 are connected by welding, and the front lower baffle 1, the vacuum booster with brake pump reinforcement plate 3 and the other end of the front longitudinal beam 5 of the front enclosure at the other end of the third cavity 8 are connected in sequence by welding.

[0060] In this embodiment, one end of the front longitudinal beam 5 at one end of the third cavity 8 is connected to the front lower baffle 1 by welding, which enhances the connection strength between the front longitudinal beam 5 and the front lower baffle 1. The front lower baffle 1, the vacuum booster with brake pump reinforcement plate 3 and the front longitudinal beam 5 at the other end of the third cavity 8 are connected by welding, which enhances the connection strength between the front lower baffle 1, the vacuum booster with brake pump reinforcement plate 3 and the front longitudinal beam 5. In addition, the welding method has low cost and can enhance the overall strength of the vehicle body front reinforcing structure without increasing the thickness of the parts and improving the material grade. Specifically, one end of the front longitudinal beam 5 at one end of the third cavity 8 is connected to the front lower baffle 1 by welding to form a third connecting portion 15, and the front lower baffle 1, the vacuum booster with brake pump reinforcement plate 3 and the front longitudinal beam 5 at the other end of the third cavity 8 are connected by welding to form a fourth connecting portion 135.

[0061] In some embodiments, an escape opening 9 is provided between the other end of the front longitudinal beam 5 of the front enclosure and the accelerator pedal connection fixing plate 4 .

[0062] In this embodiment, the avoidance opening 9 can avoid interference when welding the front longitudinal beam 5 of the front enclosure or the accelerator pedal connecting and fixing plate 4 with the front enclosure lower baffle 1 and the vacuum booster with brake pump reinforcement plate 3, thereby avoiding welding the front longitudinal beam 5 of the front enclosure and the accelerator pedal connecting and fixing plate 4 together.

[0063] In some embodiments, the vehicle body front wall reinforcement structure further includes: a steering column escutcheon 2, which is connected to the front wall lower baffle 1 and is used to install the steering column of the vehicle.

[0064] In this embodiment, the steering column hole cover 2 can not only effectively prevent dust, dirt and moisture from entering the steering column of the car, protect the internal parts of the steering system and extend their service life, but also the steering column hole cover 2 is connected to the front lower baffle 1, which can further enhance the overall strength of the front reinforcement structure of the vehicle body.

[0065] In some embodiments, the front cowl lower baffle 1, the steering column escutcheon 2 and the vacuum booster with brake pump reinforcement plate 3 are sequentially connected by welding.

[0066] In this embodiment, the front lower baffle 1, the steering column escutcheon 2 and the vacuum booster with brake pump reinforcement plate 3 are connected together by welding, which enhances the connection strength between the front lower baffle 1, the steering column escutcheon 2 and the vacuum booster with brake pump reinforcement plate 3. In addition, the welding method has low cost and can enhance the overall strength of the vehicle body front baffle reinforcement structure without increasing the thickness of the parts and improving the material grade. Specifically, the front lower baffle 1, the steering column escutcheon 2 and the vacuum booster with brake pump reinforcement plate 3 are welded to form the fifth connection portion 123.

[0067] Combination Figure 7As shown, the present invention also provides a method for installing a vehicle body front wall reinforcement structure, comprising steps S10 to S50:

[0068] S10, installing the front lower baffle 1 on the vehicle;

[0069] S20, connecting the steering column escutcheon 2 to the front lower baffle 1;

[0070] S30, connecting the vacuum booster with brake pump reinforcement plate 3 to the front lower baffle plate 1, and forming at least one first cavity 6 with the front lower baffle plate 1;

[0071] S40, connecting the accelerator pedal connection fixing plate 4 to the vacuum booster with brake pump reinforcement plate 3, and forming a second cavity 7 with the vacuum booster with brake pump reinforcement plate 3;

[0072] S50, connecting the dash front longitudinal beam 5 to the dash lower baffle 1, and forming a third cavity 8 with the dash lower baffle 1.

[0073] In the embodiment of the present invention, the overall strength of the front structure of the vehicle body is enhanced by the vacuum booster with brake pump reinforcement plate 3, the accelerator pedal connection fixing plate 4 and the front longitudinal beam 5, thereby increasing the installation structural strength of the pedal, and the requirements of lightweight and cost reduction of the front structure of the automobile body are met by the provision of the first cavity 6, the second cavity 7 and the third cavity 8.

[0074] Combination Figure 8 As shown, in some embodiments, the method for installing the vehicle body front wall reinforcement structure further includes steps S100 to S400:

[0075] S100, welding the steering column escutcheon 2 to the front lower baffle 1;

[0076] S200, connecting the front lower baffle 1 and the vacuum booster with brake pump reinforcement plate 3 at both ends of the first cavity 6 by welding;

[0077] S300, connecting the accelerator pedal connection fixing plate 4 and the vacuum booster with brake pump reinforcement plate 3 at both ends of the second cavity 7 by welding;

[0078] S400, connecting one end of the front longitudinal beam 5 at one end of the third cavity 8 and the front lower baffle 1 by welding, and connecting the front lower baffle 1, the vacuum booster with brake pump reinforcement plate 3 and the other end of the front longitudinal beam 5 at the other end of the third cavity 8 in sequence by welding.

[0079] In this embodiment, the welding method has a low cost and can enhance the overall strength of the vehicle body front reinforcement structure without increasing the thickness of the parts and improving the material grade, further realizing the needs of lightweight and cost reduction of the automobile body front structure.

[0080] Among them, steps S10 to S50 and steps S100 to S400 are only used for marking to facilitate understanding and do not represent the order of steps in actual application scenarios.

[0081] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A vehicle body front wall reinforcement structure, used for installation on a vehicle, characterized in that: include: A front lower baffle, wherein the front lower baffle is installed on the automobile; A vacuum booster with a brake pump reinforcement plate, the vacuum booster with a brake pump reinforcement plate is connected to the front lower baffle plate and forms at least one first cavity with the front lower baffle plate, and the vacuum booster with a brake pump reinforcement plate is used to install a brake pedal of a vehicle; An accelerator pedal connection fixing plate, the accelerator pedal connection fixing plate is connected to the vacuum booster with brake pump reinforcement plate, and forms a second cavity with the vacuum booster with brake pump reinforcement plate, and the accelerator pedal connection fixing plate is used to install the accelerator pedal of the vehicle; A dash front longitudinal beam longitudinally spans the dash lower baffle, is connected to the dash lower baffle, and forms a third cavity with the dash lower baffle.

2. The vehicle body front wall reinforcement structure according to claim 1, characterized in that: The front lower baffle and the vacuum booster with brake pump reinforcement plate at both ends of the first cavity are connected by welding.

3. The vehicle body front wall reinforcement structure according to claim 1, characterized in that: The accelerator pedal connection fixing plate and the vacuum booster with brake pump reinforcement plate at both ends of the second cavity are connected by welding.

4. The vehicle body front wall reinforcement structure according to claim 1, characterized in that: One end of the front dash front longitudinal beam is connected to the front dash lower baffle, and the other end is connected to an end of the vacuum booster with brake pump reinforcement plate close to the front dash front longitudinal beam.

5. The vehicle body front wall reinforcement structure according to claim 4, characterized in that: One end of the front longitudinal beam of the front enclosure at one end of the third cavity and the front lower baffle are connected by welding, and the front lower baffle, the vacuum booster with brake pump reinforcement plate and the other end of the front longitudinal beam of the front enclosure at the other end of the third cavity are connected in sequence by welding.

6. The vehicle body front wall reinforcement structure according to claim 4, characterized in that: An escape opening is arranged between the other end of the front longitudinal beam of the front enclosure and the accelerator pedal connection fixing plate.

7. The vehicle body front wall reinforcement structure according to claim 1, characterized in that: Also includes: A steering column escutcheon is connected to the front lower baffle plate and is used for installing a steering column of a car.

8. The vehicle body front wall reinforcement structure according to claim 7, characterized in that: The front wall lower baffle, the steering column pore cover and the vacuum booster with brake pump reinforcement plate are connected in sequence by welding.

9. A method for installing a vehicle body front wall reinforcement structure, characterized in that: include: Install the cowl lower fender on the vehicle; Connecting the steering column escutcheon to the lower front fender; The vacuum booster with brake pump reinforcement plate is connected to the front lower baffle plate, and forms at least one first cavity with the front lower baffle plate; Connecting the accelerator pedal connection fixing plate to the vacuum booster with brake pump reinforcement plate, and forming a second cavity with the vacuum booster with brake pump reinforcement plate; The dash front longitudinal beam is connected to the dash lower baffle plate and forms a third cavity with the dash lower baffle plate.

10. The method for installing the vehicle body front wall reinforcement structure according to claim 9, characterized in that: Also includes: Welding the steering column escutcheon to the lower front baffle; Connecting the front lower baffle and the vacuum booster with brake pump reinforcement plate at both ends of the first cavity by welding; Connecting the accelerator pedal connection fixing plate and the vacuum booster with brake pump reinforcement plate at both ends of the second cavity by welding; One end of the front longitudinal beam of the front enclosure at one end of the third cavity and the front lower baffle are connected by welding, and the front lower baffle, the vacuum booster with brake pump reinforcement plate and the other end of the front longitudinal beam of the front enclosure at the other end of the third cavity are connected in sequence by welding.

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