JPH08244597A - Brake booster installing structure of vehicle - Google Patents

Abstract

PURPOSE: To obtain a constitution of a simple structure, a light weight, and of a low manufacturing cost, by fixing one ends of the housings of brake boosters to the front side and the rear side brackets through bolts and the like, and providing the first and the second brake boosters whose opposing other ends of the housings are connected each other through a combining device. CONSTITUTION: The first and the second brake boosters 62 and 64 for rear wheel brake device operating purpose are supported by supporting one ends of their housings by the rear side and the front side brackets 80 and 78 respectively. Since the opposing other ends are supported being-combined each other by a combining device 110, a defection preventive bracket is not necessary to provide. Since the third brake booster 52 is provided whose one end of housing is supported by a rear side bracket 80 while the other end is supported to the front side bracket 78 through a deflection preventive bracket 114, the number of deflection preventive bracket and the supporting bracket can be reduced extensively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle brake booster mounting structure.

[0002]

2. Description of the Related Art Conventionally, an antilock brake control device (for example, an AB
A typical configuration of a pneumatic-hydraulic compound brake device including an S or ABS device) will be described with reference to the overall configuration diagram of FIG. 9 and the schematic plan view of FIG. 8. First, in FIG. 9, the compressed air discharged from the air compressor 10 driven by the engine of the vehicle is filled in the first air tank 16 via the air dryer 12. The compressed air supplied to the first air tank 16 passes through the air pipes 18 and 20, and the second air tank 22 separates the tank chambers 2 from each other.
4 and 26 are filled.

The tank chambers 24 and 26 are connected to the first valve portion 34 and the second valve portion 36 of the dual brake valve 32 via air lines 28 and 30, respectively, so that the driver can operate the brake pedal of the brake valve 32. When is depressed, the signal pressure is supplied from the output conduits 38 and 40 to the first and second relay valves 42 and 44, respectively. When the signal air pressure is supplied to the first and second relay valves 42 and 44, each relay valve is opened and a large amount of compressed air flows from the tank chambers 24 and 26 to the output pipelines 46 and 48.

The compressed air flowing through the output conduit 46 is A
The pressure is adjusted by a modulator 50, which constitutes a main part of the BS device, and the pressure is supplied to a pneumatic-hydraulic combined brake booster 52. By supplying compressed air to the brake booster 52, the brake fluid in the hydraulic cylinder 52 ′ is pressurized, and the wheel cylinder 56 of the front wheel braking device 54.
Brake fluid pressure is supplied to the front wheel braking device. On the other hand, the compressed air supplied to the output pipe line 48 is adjusted in pressure by the ABS modulator 58 for the left rear wheel and the ABS modulator 60 for the right rear wheel, and the brake boosters 62 and 64 of the pneumatic-hydraulic combined type are respectively provided. Is supplied to. By supplying compressed air to the brake boosters 62 and 64, the brake fluid in the hydraulic cylinders 62 ′ and 64 ′ is pressurized, and the wheel cylinders 68 of the left rear wheel braking device 66 and the right rear wheel braking device 70. And 72
Brake fluid pressures are supplied to the respective left and right rear wheel brake devices, and the rear wheel brake devices operate. Reference numeral 74 in the drawing is a fluid tank or reservoir for replenishing the hydraulic cylinders 52 ', 62' and 64 'with brake fluid.

Of the pneumatic / hydraulic hybrid brake system with ABS device shown in the schematic diagram of FIG. 9, the components other than the air compressor 10, the dual brake valve 32 and the front and rear wheel brake devices 54, 66 and 70, that is, the air dryers. All the components from 12 to the brake booster and the hydraulic cylinders 52 ', 62', 64 'integrated therewith are usually provided for convenience of manufacture, inspection, equipment, etc.
It is centrally located in one place of the vehicle. Now above ABS
An example of the concentrated arrangement structure of the brake device-equipped components will be described with reference to the schematic plan view of FIG.
Reference numerals 80 and 80 denote a pair of front and rear brackets each having one side edge fixed to the side rail 76 by fixing means such as bolts and extending in the vehicle width direction. The first air tank 16 and the second air tank 22 are suspended by U-bolts or the like in the arcuate recesses provided.

On the rear bracket 80, one end of the housing of the brake boosters 62 and 64 arranged substantially in parallel for operating the rear wheel braking devices 66 and 70 is supported by bolts or the like, and The ends are respectively fixed to the front bracket 78 via steady rest brackets 82 and 84 having a substantially V-shaped planar shape. In front of the front bracket 78, the housing of the brake booster 52 for operating the front wheel brake device 54 is mounted so as to be inclined by a pair of support brackets 86 and 88. Further, modulator brackets 90 and 92, which are fixed to the front and rear brackets 78 and 80 at the front and rear ends thereof and are arranged substantially parallel to the side rails 76, are provided. The modulator brackets 90 and 92 are provided with the front wheel brake booster. A modulator 50 for adjusting the operating compressed air pressure of 52 and modulators 58 and 60 for adjusting the operating air pressure of the rear wheel brake boosters 62 and 64 are mounted. Further, the pressure governor 14 is mounted on the front bracket 78, while the rear bracket 80 is mounted on the rear bracket 80.
Fluid tanks or reservoirs 74 for replenishing the brake fluid to 2 ', 62' and 64 'via hoses or pipes 94 are mounted via reservoir brackets 96, respectively.

In the centralized arrangement structure of the above-mentioned conventional brake device constituent members for the vehicle, the brake boosters 62 and 64 for the rear wheel brake device are attached to the front and rear brackets 78.
And 80 to provide steady rest brackets 82 and 84, respectively, and a pair of support brackets 86 and 88 to support the brake booster 52 for the front wheel brake system. That is, in order to centrally arrange the three brake boosters 52, 62 and 64 in the pneumatic / hydraulic hybrid brake device with the ABS device to the vehicle body, in addition to the front and rear brackets 78 and 80 as main supporting members, a total of The need for four auxiliary brackets 82, 84, 86 and 88 has the drawback of significantly complicating the structure and increasing weight and manufacturing costs.

[0008]

SUMMARY OF THE INVENTION According to the present invention, the front and rear wheel brake devices of a vehicle are centrally arranged with the above-mentioned main constituent members of a brake device with an ABS device, which are operated by pneumatic and hydraulic combined brake boosters. The main object of the present invention is to provide a structure for mounting and supporting a plurality of brake boosters described above, which is simple and lightweight and has a low manufacturing cost, in a device mounted on a vehicle body. Also, the present invention provides the above-mentioned plurality of brake boosters, particularly one for the front wheel braking device and two for the rear wheel braking device.
Another object is to provide a brake booster mounting structure in which a total of three brake boosters can be reasonably arranged in a small space.

[0009]

The present invention was devised in order to achieve the above-mentioned object, and it is provided on the side rails of the undercarriage frame so as to extend substantially outward in the vehicle width direction. A pair of brackets, and first and second brake boosters in which one end of each housing is fixed to the front and rear brackets by a bolt or the like, and the other opposite ends of the housing are connected to each other by a connecting device. The present invention proposes a vehicle brake booster mounting structure characterized by being provided.

Further, according to the present invention, a third brake booster is mounted between the first and second brake boosters and the side rail, and the third brake booster has one end portion of its housing mounted on the front and rear sides. A brake booster mounting structure for a vehicle, which is fixed to one of the brackets and has the other end of the housing supported by the other of the front and rear brackets via a steadying bracket. In the present invention, in the coupling device, one leg is fixed to the other housing opposite ends of the first and second brake boosters, respectively, and the other leg is coupled to each other by a bolt. It is preferably composed of a second L-shaped connecting member. Also, in the present invention, in the coupling device, respective bottom portions are fixed to the other housing opposite ends of the first and second brake boosters, and parallel leg portions extending from both ends of each bottom portion are respectively bolted. May be composed of first and second U-shaped connecting members which are connected to each other by
At least one of the bolt holes through which the bolts of the connecting member fixed to the other end of the brake booster housing is inserted is a long hole having a long axis in the axial direction of the first or second brake booster. preferable. Still further, in the present invention, the coupling device includes first and second long nuts respectively screwed to the opposite other end portions of the housings of the first and second brake boosters, and both end portions of the coupling nuts to the first and second long nuts. The intermediate screw shaft screwed to the first and second long nuts, and the first and second lock nuts screwed to the intermediate screw shaft and abutting the first and second long nuts. it can.

[0011]

According to the present invention, the first and second brake boosters have one end of each housing supported by the front and rear brackets and the other opposite ends connected to each other by the connecting device. Since it is supported by the front and rear brackets, the steady rest bracket for supporting the first and second booster brackets can be omitted. In addition, since the first and second booster brackets are arranged back to back in a skewer shape, it is possible to secure a sufficient space margin between the front and rear brackets. Can be rationally arranged.

[0012]

Embodiments of the present invention will be specifically described below with reference to FIGS. (Note that members and portions that are substantially the same as or corresponding to those of the conventional pneumatic-hydraulic hybrid brake device described with reference to FIGS. 8 and 9 are denoted by the same reference numerals, and duplicate description will be omitted.) First, referring to FIGS. 1 to 4 showing a first embodiment of the present invention, one of a pair of left and right side rails extending in the vehicle front-rear direction in a chassis frame of a vehicle such as a truck, usually a web 76 of a right side rail 76. ′, The inner edges of the pair of front and rear brackets 78 and 80 are fixed to each other by a plurality of mounting bolts 98, and the brackets 78 and 80 face substantially outward in the vehicle width direction and are substantially parallel to each other. It has been extended.

In particular, as best seen in the front view of the vehicle body seen from the rear side of FIG. 2, the lower edges of the rear bracket 80 and the front bracket 78 (not shown in FIG. 2) are
Arc-shaped recesses 100 and 102 are provided respectively, and the first and second air tanks 16 and 22 in which a part of the outer circumferences of the recesses 100 and 102 are fitted are provided in the front and rear U, respectively. It is suspended by bolts 104. Further, one of the left and right rear wheel braking devices, for example, one end of the housing of the first brake booster 62 for operating the left rear wheel braking device 66 is attached to the rear bracket 80 by a plurality of bolts 106. Further, one end of the housing of the second brake booster 64 for operating the right rear wheel brake device 70 is attached to the front bracket 78 by a plurality of bolts 108. The first
And the opposite ends of the housings of the second brake boosters 62 and 64 are connected to each other by a connecting device generally indicated by reference numeral 110.
Form a steady rest of each brake booster 62 and 64.

The axes of the first and second brake boosters 62 and 64 are contained in a vertical plane substantially parallel to the side rails 76, as best shown in FIG. Further, a third brake booster 52 for operating the front wheel braking device 54 is arranged between the first and second brake boosters 62 and 64 and the side rail 76,
In the booster 52, one end of the housing is supported by the rear bracket 80 by a plurality of bolts 112, and the other end of the housing is a front bracket 78 by a steady rest bracket 114 having a substantially V-shaped plane.
Supported by. As illustrated, the axis of the third brake booster 52 is included in a vertical plane that is substantially parallel to the side rails 76. The third brake booster 52
, The first relay valve 42 is integrally assembled to
A second relay valve 44 is integrally assembled with the first brake booster 62.

Further, the rear bracket 80 has
ABS for controlling the air pressure supplied to the first brake booster 62 via the modulator bracket 116.
An ABS modulator 50 that controls the air pressure supplied to the modulator 58 and the third brake booster 52 is mounted, and the front bracket 78 is mounted on the second brake booster 6 via a modulator bracket 118.
An ABS modulator 60 that controls the air pressure supplied to the vehicle 4 is mounted. Further, a fluid tank or reservoir 74 is attached to the rear bracket 80 via a bracket 122. The fluid tank or reservoir 74 is connected to hydraulic cylinders 62 ', 64' and 52 'which are integrally assembled to the first to third brake boosters 62, 64 and 52, respectively, via a hose or pipe line 94. The brake fluid to be supplied is stored. On the other hand, the front bracket 78 includes a support bracket 124.
The air dryer 12 is mounted via the.

The coupling device 110, as best shown in the partial plan view of FIG. 3, includes a pair of monopods 1 at opposite ends of the first and second brake boosters 62 and 64, respectively.
26a and 128a are provided with L-shaped connecting members 126 and 128 fixed by bolts and nuts. The other leg portions 126b and 12 of the connecting members 126 and 128
8b, as best shown in the front view of FIG.
Each of the elongated holes 13 extending in the axial direction of the brake booster
0 is provided, and the connecting member 12 that cooperates by inserting the bolt 132 into the same elongated hole 130 and screwing the nut
First and second brake booster 6 via 6 and 128
Two and sixty-four housings are interconnected. The slot 130 includes front and rear brackets 78 and 80, a first bracket.
Since the main purpose is to absorb the manufacturing error and the assembly error which are unavoidable in the manufacturing technology of the second brake boosters 62 and 64, the connecting members 126 and 12 are used.
8 may be provided on one side and a normal circular bolt hole may be provided on the other side.

The above first to third brake boosters 6
The operating modes of 2, 64 and 52 are the same as those of the conventional A shown in FIG.
Since it is substantially the same as the brake device with BS device and is well known in the art, detailed description thereof will be omitted. The first
According to the configuration of the embodiment, the first for operating the rear wheel brake device is used.
And second brake boosters 62 and 64 connect the rear and front brackets 80 and 78 to one end of the housing, respectively.
The other end, which is supported by and is opposed to
Since they are interconnected and supported by 0, it is not necessary to provide the steady brackets required in the conventional device, and the third brake booster 52 is supported by the rear bracket 80 at one end of its housing. In addition, since the other end is supported by the front bracket 78 by the steady rest bracket 114, the number of steady rest brackets and support brackets can be greatly reduced as compared with the conventional device that requires two support brackets. So
The structure is simplified and the weight and the manufacturing costs can be correspondingly reduced. Further, by arranging the first and second brake boosters 62 and 64 in a skewered shape, the second brake booster 52 can be arranged in the space between the brake boosters 62 and 64 and the side rail 76. , A total of 3 brake boosters 62, 6
There is an advantage that the space required for the arrangement of 4 and 52 can be reduced.

Next, FIG. 5 shows a second embodiment of the present invention. In this embodiment, a coupling device 110 for coupling the opposite ends of the housings of the first and second brake boosters 62 and 64 arranged in a skewer-shape to each other has the bottom portions 132a and 134a as the housing ends. U-shaped connecting members 13 fixed by bolts and nuts
2 and 134. Two parallel legs 132 of cooperating coupling members 132 and 134
b and 134b are fastened by a bolt 136 and a nut, respectively. By forming at least one bolt hole 136 of the connecting members 132 and 134 as an elongated hole extending in the booster axial direction, the front and rear brackets 78 and 80, the first bracket
The manufacturing error and the assembly error of the second brake boosters 62 and 64 can be effectively absorbed. With the configuration of the second embodiment, similar to the first embodiment, the structure is simple, the weight and the manufacturing cost can be reduced, and the space saving effect can be obtained.

Further, FIGS. 6 and 7 show a third embodiment of the present invention. In this embodiment, a coupling device 110 for coupling opposite ends of the housings of the first and second brake boosters 62 and 64 arranged in a skewered pattern.
Are the first and second long nuts 138 and 140 screwed to the screw shafts projecting from the end portions of the first and second brake boosters 62 and 64, and the first and second long nuts 138.
Screw shaft 144 whose both ends are screwed into the shafts 140 and 140, respectively.
And a lock nut 142 screwed onto the intermediate screw shaft 144 and tightly crimped to the opposite end faces of the first and second long nuts 138 and 140, respectively. It is apparent that this configuration, as in the first embodiment, can have a simple structure, reduce weight and manufacturing cost, and have a space-saving effect, as in the first embodiment.
Also, by adjusting the screwing depth of at least one of the first and second long nuts 138 and 140, the front and rear brackets 78 and 80, the first and second brake booster 6
The manufacturing error and the assembly error of 2 and 64 can be effectively absorbed.

[0020]

As described above, in the vehicle brake booster mounting structure according to the present invention, a pair of front and rear brackets are provided to extend laterally outward in the vehicle width direction on the side rail side of the chassis frame. And first and second brake boosters in which one end of each housing is fixed to the front and rear brackets with a bolt or the like, and the other opposite ends of the housing are connected to each other by a connecting device. In comparison with the conventional device of the same type, it has the advantages of simple structure and light weight, and low manufacturing cost.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a first embodiment of the present invention.

FIG. 2 is a front view of the device shown in FIG. 1 as viewed from the rear of the vehicle body.

FIG. 3 is an enlarged plan view of the coupling device 110 in FIG.

4 is a front view of connecting members 126 and 128 in FIG.

FIG. 5 is an enlarged plan view of a coupling device 110 showing a second embodiment of the present invention.

FIG. 6 is an enlarged plan view of a connecting device 110 showing a third embodiment of the present invention.

7 is an enlarged cross-sectional view of a main part of the coupling device 110 shown in FIG.

FIG. 8 is a schematic plan view showing a concentrated arrangement structure of main constituent members including a brake booster of a conventional brake device with an ABS device.

FIG. 9 is a schematic configuration diagram showing an overall configuration of a general brake device with an ABS device.

[Explanation of symbols]

10 ... Air compressor, 16 ... First air tank, 22
… Second air tank, 32… Dual brake valve, 4
2 and 44 ... Relay valve, 50, 58 and 60 ... Modulator, 52 ... Front wheel brake booster (third brake booster), 62 and 64 ... Rear wheel brake booster (first and second brake booster), 54 ... Front wheel Brake device, 66 and 70 ... Rear wheel brake device, 76 ... Side rail of chassis frame, 78 ... Front bracket, 80
... rear bracket, 110 ... connecting device, 126, 12
8, 132 and 134 ... Connecting members, 138 and 140 ...
Long nut, 144 ... Intermediate screw shaft, 142 ... Lock nut

Claims (6)

[Claims] 1. A pair of front and rear brackets that are provided to extend laterally outward in the vehicle width direction on the side rails of the chassis frame, and one end of each housing is fixed to the front and rear brackets with bolts or the like. And a first and a second brake booster in which the other opposite ends of the housing are connected to each other by a connecting device. 2. A third brake booster is mounted between the first and second brake boosters and the side rail, and the third brake booster has one end of its housing mounted on one of the front and rear brackets. 2. The vehicle brake booster mounting structure according to claim 1, wherein the brake booster mounting structure is fixed and the other end of the housing is supported by the other of the front and rear brackets via a steady bracket. 3. The first coupling device according to claim 1, wherein one leg portion is fixed to each of the other housing opposite ends of the first and second brake boosters, and the other leg portion is coupled to each other by a bolt. The brake booster mounting structure for a vehicle according to claim 1, wherein the brake booster mounting structure includes a second L-shaped connecting member. 4. The coupling device has respective bottom portions fixed to the other housing opposite ends of the first and second brake boosters, and parallel leg portions extending from both ends of each bottom portion are respectively bolted. The brake booster mounting structure for a vehicle according to claim 1, wherein the brake booster mounting structure is formed of first and second U-shaped connecting members that are connected to each other by means of. 5. The axis of the first or second brake booster has at least one of bolt holes through which the bolts of a connecting member fixed to the other ends of the housings of the first and second brake boosters are inserted. The brake booster mounting structure for a vehicle according to claim 4 or 5, wherein the hole is a long hole having a long axis in the direction. 6. The connecting device comprises first and second long nuts respectively screwed to the opposite end portions of the housings of the first and second brake boosters, and both end portions of the first and second long nuts. An intermediate screw shaft screwed to the second long nut, and first and second lock nuts screwed to the intermediate screw shaft and abutting the first and second long nuts. The brake booster mounting structure for a vehicle according to claim 1.