JPS6017401Y2 - pneumatic booster - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pneumatic booster that increases the strength of the shell and improves workability during assembly.

A pneumatic booster has a valve body located in the center of the booster body that is movable in the axial direction, and a piston plate that extends in the radial direction integrally with the valve body, which is located in the center of the booster body and is housed in a housing composed of a front shell and a rear shell. and a diaphragm disposed around the valve body and extending radially outwardly along the piston plate to the outer peripheral wall of the housing; Generally, the mask cylinder was attached to the rear shell, and then fixedly supported by bolts provided on the rear shell to the toe board (the board that partitions the driver's seat and the engine compartment of the vehicle).

When installing a booster by such means,
The front shell and the rear shell themselves must act as strength members to support the force acting on the mask cylinder when the brake foot pedal is depressed.

However, the strength of the shell is insufficient to support the force acting on the mask cylinder, and this causes the problem that the shell deforms and increases the stroke loss of the booster.

One possible way to solve this problem is to increase the thickness of the front and rear shells to increase the strength of the shells themselves, but this only results in the inconvenience of increasing the weight of the booster itself. This is not desirable as it means using a lot of materials unnecessarily.

The present invention provides a pneumatic booster that can withstand the force acting on the mask cylinder with sufficient strength without particularly increasing the wall thickness of the shell, and solves the above-mentioned problems. The purpose is to improve the

Specific examples will be explained below based on the drawings.

As shown in FIG. 1, the device main body 1 includes a front shell 2 and a rear shell 3 to form a housing of the booster.

A pulp pod 4 is slidably held in the rear shell 3, and a flange 5 at the front end is attached to the valve body 4.
Annular grooves 6 are formed at a certain distance apart,
The inner peripheral end of a dish-shaped piston plate 7 having a through hole in the center is sandwiched and fixed between the flange portion 5 and one side of a ring 8 fitted in an annular groove 6. .

Ring 8 is shaped by cutting a part of a ring shape.
This is a so-called C-shaped swing.

A diaphragm 9 as a defining member, which is arranged around the valve body 4 and extends radially outward from the valve body 4 to the outer peripheral wall of the shell, is adhered to the piston plate 7, and has an inner peripheral end 9a. is fitted into the cylinder body 4, and its outer peripheral end 9b is sandwiched between the ends 2aw3a of the front shell 2 and rear shell 3, and the interior of the shell 2.3 is divided into two compartments A and B. It's divided.

The valve body 4 includes a valve mechanism 10 for performing a boost operation.

This valve mechanism 10 is held by a valve body 4,
It is actuated by an input rod 11 connected to and acted upon by a foot pedal (not shown).

The tip or front end of the output rod 12 extends forward through the side wall of the front shell 2 and is connected to a piston (not shown) of a mask cylinder provided in the front shell 2 via a spacer.

The rear end of the output lot 12 is slidably mounted on a disk holder 15 via a disk 14.

A plurality of claws 16 are provided extending circumferentially from the vertical portion of the piston plate 7 toward the front shell 2 side, and the outer peripheral end of the disc holder 15 is fixed by these claws 16, and in this way, the piston plate 7 is fixed. Valve body 4
Additionally, the disk holders 15 are each fixed to the piston plate 7, forming an integral assembly.

In addition to the above configuration, the booster of the present invention has an output rod 12 that passes through the front shell 2, piston plate 7, diaphragm 9, and rear shell 3 and extends from the front to the rear of the booster main body 1. It includes two connecting rods 17 arranged horizontally apart from each other.

The connecting rod 17 has a threaded portion 17a projecting to the outside of the front shell 2 at its tip, and a shoulder portion 17c is provided between the main body portion 17b and the threaded portion 17a as shown in FIG. This shoulder portion 17c is abutted against the through-hole portion 2b of the front barrel 2, and caulking 18 is applied from the outside to integrally fasten the through-hole portion 2b and the connecting rod 17.

In addition to the caulking 18, the through-hole portion 2b and the connecting rod 17 can be integrally connected by screwing a stopper 19 having an internal thread into the threaded portion 17a as shown in FIG.

Furthermore, in the booster of the present invention, as shown in the figure, the through hole portion 2b is made to protrude into the inside of the device main body 1, a recess 20 is formed on the outside, and a connecting rod 17 that protrudes outside is formed in the recess 20. The sealing member 21 is placed in the recess 20 with a portion 21a of the sealing member 21 protruding outside the recess 20, that is, with the sealing member 21 protruding from the front surface 2c of the front shell 2. When the threaded portion 17a is assembled to the mask cylinder, a gap is not formed between the front shell 2 and the mask cylinder. Pushing inward, the sealing member 21 is placed more closely within the recess 20.

The tip of the connecting rod 17 on the rear shell side similarly has a threaded portion 17d, and a flat washer 22 is applied to the shoulder portion 17e to abut the inside of the through hole portion 3b. It is inserted through the through hole portion 3b and protrudes to the outside.

It is preferable that the washer 22 and the through-hole portion 3b are fixed by welding and that a seal is provided by this welding.

The threaded portions 17a and 17d are used for attaching the mask cylinder and to the toe board, respectively.

With the above configuration, the front shell 2 and the rear shell 3 are connected to each other by the connecting rod 17.

In the case of this example, the front shell 2 and the rear shell 3 are fixed by the connecting rod 17 so as to maintain tension between them, so that the outer peripheral end 9b of the diaphragm 9 is connected to the end 2a of each shell. , 3a, the outer peripheral end portion 9b is held and fixed.

Therefore, there is no need for a band or other fastening means for fixing the diaphragm 9 to the shell, and as a result, the outer diameter of the booster can be reduced compared to a method that uses a band, and the fastening process is troublesome. Moreover, good airtightness can be maintained.

In the vicinity of the holes in the diaphragm 9 and the piston plate 7 through which the connecting rod 17 passes, there is a lip seal 2 that is in airtight contact with the connecting rod 17 and that surrounds the connecting rod 17.
3 is formed using a part of the diaphragm 9, and seals the compartments A and B inside the shells 2 and 3, which are partitioned into two by the diaphragm 9, and the diaphragm 9 and the piston plate 7 effectively apply differential pressure. I try to accept it.

In addition, in order to securely attach the booster body 1 to the toe board, it is preferable that a plurality of connecting rods 17 be provided, for example, two connecting rods as in this example, or three connecting rods 1.
7 is sufficient.

When a booster with the above configuration is installed on the vehicle body, movement is transmitted to the valve body 4 via the input rod 11 by depressing the foot pedal, and a force is applied to the valve body 4. Through the piston plate 7 and disk holder 15, which are integrated into one assembly, the power is boosted and taken out to the output lot 12, similar to known boosters.

The reaction of the force applied from this output rod 12 to the piston of the mask cylinder is transmitted from the mask cylinder body to a spacer (not shown), then to the connecting rod 17, and finally to the toe board.

That is, in the booster according to the present invention, the reaction of the operating force exerted on the master cylinder during operation is supported by the high tensile rigidity of the connecting rods 17 provided in the front and rear shells 2, 3.

In the above specific example, both ends of the connecting rod 17 are used to attach the main body of the booster to the toe board and to attach the mask cylinder via the spacer, but the present invention is not limited to this. The connecting rod 17 may extend between the shells 2 and 3 to connect the shells 2 and 3.
It is not necessary that the two ends of the board and the spacer be fixed through each other, and a separate coupling means such as a bolt may be provided to attach them.

However, the present example is more advantageous because the number of parts can be reduced.

Further, in the specific example described above, the front shell and the connecting rod are integrally fastened, but instead of this, the rear shell and the connecting rod may be integrally fastened.

According to the present invention having the above configuration, since the front shell and the rear shell are connected by a connecting rod, deformation of the shell can be prevented and the reliability of durability performance is increased.

In addition, since almost no force is applied to the front and rear shells themselves, the shells can be made thinner than previous shells, or the shell material can be made of synthetic resin or plastic, which is easy to mold, instead of using metal. This made it possible to significantly reduce the manufacturing cost of boosters.

Furthermore, since the connecting rod connects the front and rear shells, the conventional connecting means at the flange portion of the shell can be omitted.

Furthermore, the work efficiency during assembly can be improved.

In the pneumatic booster according to the present invention, the sealing member held in the recess with a portion protruding outside the recess surrounds one end of the connecting rod protruding outside the housing in the recess. Therefore, for example, if the recess is formed in the front shell, the seal can be secured by a spacer placed on the end wall of the mask cylinder or between this end wall and the front shell during attachment to the mask cylinder. As a result of being able to press the protruding end of the member outside the recess into the inside of the recess, the sealing member can be arranged more closely within the recess, and the gap between the shell through-hole portion and the connecting rod is reliably closed and the compartment in the housing is closed. can be made airtight as desired, and at the same time new technical problems arising from the employment of connecting rods to increase the strength of the shell can be solved.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the booster of the present invention, with the upper half showing a vertical cross section and the lower half showing a horizontal cross section, and Figures 2 and 3 showing the fastening structure between the front shell and the connecting rod. FIG. 1...Device main body, 2...Front shell,
3... Rear shell, 4... Valve body, 7... Piston plate, 9... Diaphragm, 17... Connecting rod, 18...・・・・・・
・Caulking, 19...stopper.

Claims (1)

[Scope of utility model registration request] a front shell; a rear shell combined with the front shell to form a housing together with the front shell; a valve body slidably held by the rear shell and having a valve mechanism therein; a defining member disposed around the valve body and extending radially from the valve body to the housing to divide the two compartments; and a defining member disposed within the housing to connect both shells. A connecting rod that penetrates and extends back and forth, a recess formed in at least one of the shell through-hole portions through which the connecting rod passes, and one end side of the connecting rod that protrudes outside the housing in the recess. and a sealing member held in the recess with a portion protruding outside the recess.