JP2985722B2 - Vehicle brake booster mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, an anti-lock brake control device (hereinafter sometimes referred to as AB
A typical configuration of a combined pneumatic / hydraulic brake device including an S or ABS device will be described with reference to the overall configuration diagram of FIG. 9 and a schematic plan view of FIG. First, in FIG. 9, compressed air discharged from an air compressor 10 driven by a vehicle engine is charged into a first air tank 16 via an air dryer 12. The compressed air supplied to the first air tank 16 passes through the air pipes 18 and 20 and is separated from the tank chamber 2 of the second air tank 22.
4 and 26 are filled.

The tank chambers 24 and 26 are connected to a first valve portion 34 and a second valve portion 36 of a dual brake valve 32 via air lines 28 and 30, respectively. , The signal pressure is supplied from the output lines 38 and 40 to the first and second relay valves 42 and 44, respectively. When 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 lines 46 and 48.

The compressed air flowing through the output line 46 is
The pressure is adjusted by a modulator 50 constituting a main part of the BS device and supplied to a combined pneumatic and hydraulic 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 brake device 54
And the front wheel brake device operates. On the other hand, the pressure of the compressed air supplied to the output line 48 is adjusted by an ABS modulator 58 for the left rear wheel and an ABS modulator 60 for the right rear wheel, and the combined pneumatic and hydraulic brake boosters 62 and 64 are respectively provided. 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 cylinder 68 of the left rear wheel brake device 66 and the right rear wheel brake device 70 And 72
The brake fluid pressure is supplied to each of the left and right rear wheel brake devices. Reference numeral 74 in the figure denotes a fluid tank or a reservoir for supplying brake fluid to the hydraulic cylinders 52 ', 62' and 64 '.

[0005] Of the pneumatic-hydraulic combined brake device with an ABS device shown in the schematic configuration diagram of FIG. 9 above, 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, ie, the air dryer All 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 and the like.
It is centrally located in one place of the vehicle. Now, the 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. 8. Reference numeral 76 denotes a side rail 78 in a chassis frame of a vehicle such as a truck.
And 80 are a pair of front and rear brackets each having one side edge fixed to the side rail 76 by a fixing means such as a bolt and extending in the vehicle width direction, and are provided at lower end edges of the front and rear brackets 78 and 80. The first air tank 16 and the second air tank 22 are suspended by U-bolts or the like in the provided arcuate concave portions.

[0006] One end of a housing of the brake boosters 62 and 64 arranged substantially in parallel for operating the rear wheel brake devices 66 and 70 is supported by the rear bracket 80 by bolts or the like. The ends are fixed to the front bracket 78 via steady rest brackets 82 and 84 having a substantially V-shaped planar shape, respectively. A housing of the brake booster 52 for operating the front wheel brake device 54 is mounted in front of the front bracket 78 with a pair of support brackets 86 and 88 inclined. Further, there are provided modulator brackets 90 and 92 having front and rear ends fixed to front and rear brackets 78 and 80, respectively, and arranged substantially parallel to the side rail 76. The modulator brackets 90 and 92 are provided with the front wheel brake booster. A modulator 50 for adjusting the working compressed air pressure of 52 and modulators 58 and 60 for adjusting the working air pressure of the rear wheel brake boosters 62 and 64 are mounted. The pressure governor 14 is mounted on the front bracket 78, and the hydraulic cylinder 5 of each brake booster is mounted on the rear bracket 80.
A fluid tank or reservoir 74 for replenishing brake fluid to hoses 2 ', 62' and 64 'via hoses or pipes 94, respectively, is mounted via a reservoir bracket 96.

[0007] In the above-mentioned conventional concentrated arrangement structure of the components of the brake device with respect to the vehicle, the brake boosters 62 and 64 for the rear wheel brake device are connected to the front and rear brackets 78.
And 80 are provided, respectively, and a pair of support brackets 86 and 88 are provided to support the brake booster 52 for the front wheel brake system. That is, in order to centrally dispose the three brake boosters 52, 62 and 64 in the combined pneumatic and hydraulic brake system with an ABS device, in addition to the front and rear brackets 78 and 80 as main support members, a total of The need for four auxiliary brackets 82, 84, 86 and 88 significantly complicates the construction and increases weight and manufacturing costs.

[0008]

SUMMARY OF THE INVENTION According to the present invention, the main components of a brake device with an ABS device in which front and rear wheel brake devices of a vehicle are respectively operated by combined pneumatic and hydraulic brake boosters are centrally arranged. A main object of the present invention is to provide a structure for mounting a plurality of brake boosters on a vehicle body with a simple structure, light weight, and low manufacturing cost. The present invention also provides a plurality of brake boosters, one for the front wheel brake device and two for the rear wheel brake device.
Another object of the present invention is to provide a brake booster mounting structure capable of arranging a total of three brake boosters in a small space.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in order to achieve the above-mentioned object, and includes a front and a rear portion of a chassis frame which is provided on a side rail of a chassis frame so as to extend substantially outward in the vehicle width direction. A pair of brackets, and first and second brake boosters each having one end of each housing fixed to the front and rear bracket by a bolt or the like and the other end of the housing facing each other connected by a connecting device; A brake booster mounting structure for a vehicle, comprising:

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 of a housing connected to the front and rear. A brake booster mounting structure for a vehicle, wherein the brake booster mounting structure is fixed to one of the brackets and the other end of the housing is supported by the other of the front and rear brackets via a steady bracket. In the present invention, the first and second brake boosters each have one leg fixed to the other end of the opposing housing of the first and second brake boosters and the other leg connected to each other by bolts. It is preferable that the second L-shaped connecting member is used. Further, in the present invention, the connecting device may be configured such that each of the bottom sides is fixed to the other end of the housing facing the first and second brake boosters, and the parallel legs extending from both ends of each bottom side are respectively bolted. The first and second U-shaped connecting members may be connected to each other by the first and second U-shaped connecting members.
At least one of the bolt holes into which the bolt of the connecting member fixed to the other end of the housing of the brake booster is inserted is a long hole having a long axis in the axial direction of the first or second brake booster. preferable. Further, in the present invention, the connecting device includes a first and a second long nut screwed to opposite opposite end portions of the housings of the first and second brake boosters, respectively. An intermediate screw shaft screwed to the first and second long nuts, and first and second lock nuts screwed to the intermediate screw shaft and abutting on 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 end opposed to each other by a connecting device. Since the first and second booster brackets are supported by the front and rear brackets, the steady rest brackets for supporting the first and second booster brackets can be omitted. In addition, by arranging the first and second booster brackets in a skewed manner back to back, a sufficient space margin can be secured between the front and rear brackets, and the third booster bracket is provided in the extra space. Can be arranged reasonably.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. (Note that members and portions substantially the same as or corresponding to those of the conventional combined pneumatic and hydraulic brake device described with reference to FIGS. 8 and 9 are denoted by the same reference numerals, and redundant description is omitted.) First, in FIGS. 1 to 4 showing the first embodiment of the present invention, one of a pair of left and right side rails extending in the vehicle longitudinal direction in a chassis frame of a vehicle such as a truck, usually a web 76 of a right side rail 76 is shown. ′, 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 are directed substantially outward in the vehicle width direction and are substantially parallel to each other. Extending.

In particular, as best shown in the front view of FIG. 2 as viewed from the rear of the vehicle body, the lower end edges of the rear bracket 80 and the front bracket 78 (not shown in FIG. 2)
Recesses 100 and 102 each having an arc shape are provided, and first and second air tanks 16 and 22 each having a part of the outer periphery thereof fitted in the recesses 100 and 102 have one U-shaped front and rear. It is suspended by bolts 104. One end of the housing of the first brake booster 62 for operating one of the left and right rear wheel brake devices, for example, the left rear wheel brake device 66, is attached to the rear bracket 80 by a plurality of bolts 106. 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
The opposite ends of the housings of the second and the second brake boosters 62 and 64 are interconnected by a coupling device, generally designated 110,
Forms a steadying device for each of the brake boosters 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 brake device 54 is disposed between the first and second brake boosters 62 and 64 and the side rail 76,
The booster 52 has one end of the housing supported by a plurality of bolts 112 on a rear bracket 80, and the other end of the housing is fixed to a front bracket 78 by a steady bracket 114 having a substantially V-shaped planar shape.
It is supported by. As shown, the axis of the third brake booster 52 is included in a vertical plane substantially parallel to the side rail 76. The third brake booster 52
, The first relay valve 42 is integrally assembled,
Further, the second brake valve 44 is integrally assembled with the first brake booster 62.

Further, the rear bracket 80 includes
ABS for controlling air pressure supplied to the first brake booster 62 via a modulator bracket 116
An ABS modulator 50 for controlling the air pressure supplied to the modulator 58 and the third brake booster 52 is mounted, and a front bracket 78 is provided via a modulator bracket 118 with the second brake booster 6.
An ABS modulator 60 for controlling the air pressure supplied to the air conditioner 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 via a hose or pipe 94 to hydraulic cylinders 62 ', 64' and 52 'integrally mounted on the first to third brake boosters 62, 64 and 52, respectively. The replenished brake fluid is stored. On the other hand, the front bracket 78 has a support bracket 124.
, An air dryer 12 is mounted.

As shown best in the partial plan view of FIG. 3, the coupling device 110 is connected to opposite ends of the first and second brake boosters 62 and 64 by respective monopods 1.
It has L-shaped connecting members 126 and 128 to which 26a and 128a are fixed by bolts and nuts. Other leg portions 126b and 12 of the connecting members 126 and 128
8b, as is well shown in the front view of FIG.
Elongate holes 13 each extending in the axial direction of the brake booster
0 is provided, and a bolt 132 is inserted into the elongated hole 130 and a nut is screwed into the cooperating connecting member 12.
6 and 128 via the first and second brake booster 6
Two and 64 housings are interconnected. The slot 130 is provided with the front and rear brackets 78 and 80, the first
Since the main purpose is to absorb manufacturing errors and assembly errors inevitable in the manufacturing technology of the second brake boosters 62 and 64, the connecting members 126 and 12
8 and the other may be provided with a normal circular bolt hole.

The first to third brake boosters 6
2, 64 and 52 operate according to the conventional A shown in FIG.
Since it is substantially the same as the brake device with the BS device and is well known in the art, a detailed description thereof will be omitted. The first
According to the configuration of the embodiment, the first brake for operating the rear wheel brake device is provided.
And second brake boosters 62 and 64 connect one end of the housing to rear and front brackets 80 and 78, respectively.
The other end supported and supported by the connecting device 11
0, the third brake booster 52 is supported at one end of its housing by the rear bracket 80, without the need for the steady rest brackets required by conventional devices. In both cases, the other end is supported by the front bracket 78 by the steady bracket 114, so that the number of the steady bracket and the number of the support brackets are greatly reduced as compared with the conventional device which required two support brackets. So
The construction is simple and the weight and manufacturing costs can be reduced accordingly. Further, by disposing the first and second brake boosters 62 and 64 in a skewered shape, the second brake booster 52 can be disposed in the space between the brake boosters 62 and 64 and the side rail 76. , A total of three brake boosters 62, 6
There is an advantage that the space required for the arrangement of 4 and 52 can be reduced.

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

FIGS. 6 and 7 show a third embodiment of the present invention. In this embodiment, a connecting device 110 for connecting the opposite ends of the housings of the first and second brake boosters 62 and 64 arranged in a skewer shape.
Are first and second long nuts 138 and 140 screwed to screw shafts projecting from ends of the first and second brake boosters 62 and 64, and the first and second long nuts 138.
Screw shafts 144 each of which is screwed at both ends to
And a lock nut 142 which is screwed to the intermediate screw shaft 144 and tightened and crimped to opposing end faces of the first and second long nuts 138 and 140, respectively. It is clear that, with this configuration, similar to the first embodiment described above, the structure can be simplified, the weight and manufacturing cost can be reduced, and a space saving effect can be achieved, as compared with the same type of conventional device.
Also, by adjusting the screw 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 boosters 6 can be adjusted.
2 and 64 can be effectively absorbed.

[0020]

As described above, the brake booster mounting structure for a vehicle according to the present invention comprises a pair of front and rear brackets protruding from the side rails of the chassis frame so as to extend substantially outward in the vehicle width direction. And first and second brake boosters having one end of each housing fixed to the front and rear brackets by bolts or the like, and the other end of the housing facing each other connected to each other by a connecting device. It has the advantages of being simpler and lighter in structure and lowering the manufacturing cost as compared with the same type of conventional device.

[Brief description of the 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.

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

FIG. 5 is an enlarged plan view of a connecting 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.

FIG. 7 is an enlarged 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 components including a brake booster of a conventional brake device with an ABS device.

FIG. 9 is a schematic configuration diagram showing an entire 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 valves, 50, 58 and 60 modulators, 52 brake boosters for front wheels (third brake boosters), 62 and 64 brake boosters for rear wheels (first and second brake boosters), 54 front wheels Brake devices, 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)

(57) [Claims] 1. A pair of front and rear brackets extending substantially outward in the vehicle width direction on the side rails of a chassis frame, and one end of each housing is fixed to the front and rear brackets by bolts or the like. And a first and second brake booster in which the other end of the housing is 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 a housing thereof attached to one of the front and rear brackets. 2. The brake booster mounting structure for a vehicle according to claim 1, wherein the other end of the housing is fixed and the other end of the front and rear bracket is supported via a steady bracket. 3. The first connection device, wherein one of the legs is fixed to the other end of the opposite housing of the first and second brake boosters, and the other leg is connected to each other by a bolt. The vehicle brake booster mounting structure according to claim 1, further comprising a second L-shaped connecting member. 4. The coupling device according to claim 1, wherein each of the first and second brake boosters has a bottom fixed to the other end of the opposing housing, and a parallel leg extending from both ends of each bottom is bolted. The vehicle brake booster mounting structure according to claim 1, further comprising a first and a second U-shaped connecting member connected to each other by (1). 5. An axial line of the first or second brake booster, wherein at least one of the bolt holes into which the bolt of the connecting member fixed to the other end of the housing of the first and second brake boosters is inserted. 5. The mounting structure according to claim 3, wherein the mounting hole is a long hole having a long axis in the direction. 6. The first and second long nuts screwed to opposite ends of the housings of the first and second brake boosters, respectively, and the coupling device connects the first and second long nuts to the first and second brake boosters. And an intermediate screw shaft screwed to the second long nut, and first and second lock nuts screwed to the intermediate screw shaft and abutting on the first and second long nuts. The brake booster mounting structure for a vehicle according to claim 1.