JPH08282469A - Air breather for pneumatic apparatus - Google Patents

Abstract

PURPOSE: To provide an air breather capable of extremely easily mounting a waterproof cover and suppressing cost. CONSTITUTION: An air breather concerned for a pneumatic apparatus is equipped with a cylindrical body 31 furnished at a casing 30, a retainer 32 to be fitted around the cylindrical member 31, and a waterproof cover 1 which is fitted around the retainer 32 and formed from a flexible material, wherein a groove 33 to lock the retainer 32 is provided in the waterproof cover 1 so that the intended air breather is accomplished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air breather used in various pneumatic equipment.

[0002]

2. Description of the Related Art Generally, a pneumatic device for controlling hydraulic pressure by pneumatic pressure is used as a control device for automobile brakes and the like.

This is, for example, as shown in Japanese Utility Model Laid-Open No. 4-131569, in which an air cylinder and a hydraulic cylinder are connected to each other, and an air piston provided in the air cylinder and a hydraulic pressure provided in the hydraulic cylinder. By connecting with a piston, the brake fluid pressure is controlled by air pressure.

The air cylinder and the air piston are operated by air pressure from the outside, and accordingly, it is necessary to discharge or take in the air in the back pressure chamber of the air cylinder to the outside. Therefore, an air breather is provided so that air in the cylinder back pressure chamber can be breathed so as not to adversely affect the inside of the device.

The air breather is constructed such that a retainer is externally fitted to a pipe communicating with an air cylinder and a metal waterproof cover is put on the retainer so as to prevent muddy water from entering the equipment. A filter is attached between the waterproof cover and the pipe.

The waterproof cover is fixed to the main body by welding or screwing, leaving a slight gap.

[0007]

However, in the above-mentioned conventional apparatus, when attaching the waterproof cover, it is necessary to weld it to the main body or fix it with screws. Therefore, the process of attaching the waterproof cover is time-consuming and causes a high cost.

The present invention has been made in view of the above matters, and a waterproof cover can be attached very easily.
It is a technical object to provide an air breather for pneumatic equipment capable of reducing costs.

[0009]

In order to solve the above technical problems, the present invention has the following constitution. That is, the waterproof cover 1 is provided with a tubular body 31 provided in the casing 30, a retainer 32 externally fitted to the tubular body 31, and a waterproof cover 1 externally fitted to the retainer 32 and formed of a flexible material. A groove 33 that engages with the retainer 32 is formed in the.

Here, the tubular body 31 is a casing 30.
May be integral with or separate from. Further, the retainer 32 can be a disk provided with a large number of holes. Further, the waterproof cover 1 can be made of natural rubber, synthetic rubber, or synthetic resin.

Further, the groove 33 need only be engaged with the retainer 32, and is not necessarily provided on the entire inner surface of the waterproof cover 1. The pneumatic breather for pneumatic equipment can be applied to pneumatic equipment such as an air over hydraulic booster for vehicle brakes and an air cylinder device for driving a clutch for actuation of a fluid retarder.

[0012]

Since the waterproof cover 1 is made of a flexible material, when it is pushed into the retainer 32, the groove 33 engages with the retainer 32 and is mounted. In this way, the waterproof cover 1 can be easily attached to the breathing port of the pneumatic equipment.

The waterproof cover engaged with the retainer 32 is
Water is prevented from entering the pneumatic equipment (casing 30).

[0014]

Embodiments of the present invention will be described with reference to FIGS. This embodiment is applied to an air-over hydraulic booster that controls the vehicle braking force.

First, the structure of the entire apparatus will be described. As shown in FIG. 2, this is provided with an air cylinder 16 for introducing air pressure into the casing 30.
While the air piston 3 is incorporated therein, the hydraulic cylinder 2 is provided continuously to the air cylinder 16.

A hydraulic piston (hydraulic piston) 4 is provided in the hydraulic cylinder 2. A control valve 10 is provided at the other end of the air cylinder 16, and air is introduced into the air cylinder 16 in response to a driver's brake operation or a signal from a control unit (ECU) not shown. ing.

Air piston 3 in the air cylinder 16
Has a screw hole 3a formed in the center thereof and an air cup 3b provided on the outer peripheral portion of the air piston 3. The piston rod 7 is screwed into the screw hole 3a.

An oil seal accommodating portion 5 is formed at one end of the air cylinder 16 so as to project to the inside of the air cylinder 16. The oil seal accommodating portion 5 is formed integrally with the air cylinder 16 by a press, and a piston stopper 9 that abuts the air piston 3 around the protruding surface 8 of the oil seal accommodating portion 5 at the maximum stroke of the air piston 3. Is projected. The piston stopper 9 has a curved surface. A hole 8a is provided at the center of the protruding surface 8.

A coil spring 11 is inserted between one end of the air cylinder 16 and the air piston 3 to constantly urge the air piston 3 in the arrow F direction. An oil seal 6 is housed inside the oil seal housing portion 5. The oil seal 6 has a substantially cylindrical shape, and the piston rod 7 penetrates inside.

A hydraulic cylinder 2 is attached to the outside of the air cylinder 16, and a hydraulic piston 4 is provided inside the hydraulic cylinder 2. The hydraulic piston 4 is interlocked with the piston rod 7, but a valve 12 is interposed between the hydraulic piston 4 and the piston rod 7, and they are connected with a slight stroke clearance. In addition, the piston rod 7 and the valve 12
The pin 13 is adapted to be coupled with.
The pin 13 is prevented from coming off by the band 18.

A hydraulic outlet 14 is provided at one end of the hydraulic cylinder 2, and the hydraulic cylinder 2 is provided.
An inlet 15 having an opening is provided at the base end of the. In addition, the air breather 50 that opens to the air cylinder 16
Is provided.

A stroke switch 1 is provided between the coil spring 11 and one end of the air cylinder 16.
7 is provided, and the operation stroke of the air piston 3 can be detected by detecting the pressing force applied to the coil spring 11.

As a procedure for assembling the entire apparatus, first,
Install the oil seal 6 in the oil seal housing 5,
The piston rod 7 is screwed into the screw hole 3a. At this time, the coil spring 11 is attached. Then, the tip of the piston rod 7 is projected from the oil seal 6 to the outside while bending the coil spring 11. Then, the valve 12 and the hydraulic piston 4 are attached to the piston rod 7 and fixed by the pin 13. Then, a band 18 surrounds the pin 13 so that the pin 13 does not come off.

Then, the flange portion 21 of the hydraulic cylinder 2 is inserted into the bolt 20 previously welded to the air cylinder 16 and the nut 19 is tightened. The air breather 50
As shown in FIG. 1, the cylindrical body 31 is fitted into a mounting pipe 51 protruding from the casing 30, and a retainer 32 is fitted outside the cylindrical body 31. The retainer 32 is formed by fitting the waterproof cover 1 formed of a flexible material onto the retainer 32. The retainer 32 is shown in FIG.
As shown in FIG. 3, the disk is in the shape of a disk having a circular hole in the center, and a rising portion 32a is provided at the edge of the central hole. Further, the retainer 32 is provided with eight air holes 32b.

A cylindrical filter 47 is placed on the upper surface of the retainer 32, and the height of the upper edge of the filter 47 is set higher than the height of the mounting pipe 51. The waterproof cover 1 made of rubber, which is attached to the retainer 32, is formed into a cup shape, and a filter holding protrusion 1 a formed to contact the filter 47 on the inner periphery thereof and the retainer 32.
A groove 33 that is locked to Further, a taper portion 1b is provided on the lower edge of the inner periphery of the waterproof cover 1 so as to facilitate the introduction of the retainer 32 into the groove 33.

A clearance C is provided between the lower edge of the waterproof cover 1 and the casing 30 to prevent water from entering due to water sprinkling or the like. As shown in FIG. 1, a case 34 formed of sheet metal may be inserted between the filter 47 and the waterproof cover 1.

As described above, the waterproof cover 1 can be attached to the retainer 32 very easily.

[0028]

According to the present invention, since the waterproof cover is made of the flexible material, it can be mounted by simply pushing it into the retainer. Therefore, the process of attaching the waterproof cover is extremely easy and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a sectional view of the entire apparatus showing an embodiment of the present invention.

FIG. 3 is a bottom view of the vicinity of a retainer showing an embodiment of the present invention.

[Explanation of symbols]

 1 ・ ・ Waterproof cover 1a ・ ・ Filter holding protrusion 1b ・ ・ Tapered part 2 ・ ・ Hydraulic cylinder 3 ・ ・ Air piston 3a ・ ・ Screw hole 3b ・ ・ Air cup 4 ・ ・ Hydraulic piston 5 ・ ・ Oil seal housing 6 ... Oil seal 7 ... Piston rod 8 ... Projection surface 9 ... Piston stopper 10 ... Control valve 11 ... Coil spring 12 ... Valve 13 ... Pin 14 ... Hydraulic outlet 15 ... Inlet 16 ...・ Air cylinder 17 ・ ・ Stroke switch 18 ・ Band 19 ・ ・ Nut 20 ・ ・ Bolt 21 ・ ・ Flange portion 30 ・ ・ Casing 31 ・ ・ Cylindrical body 32 ・ ・ Retainer 32b ・ ・ Air hole 33 ・ ・ Groove 34 ・・ Case 47 ・ ・ Filter 50 ・ ・ Air breather 51 ・ ・ Mounting pipe

Claims (1)

[Claims] 1. A tubular body provided in a casing, a retainer externally fitted to the tubular body, and a waterproof cover externally fitted to the retainer and formed of a flexible material. The waterproof cover is provided with the retainer. An air breather for pneumatic equipment, characterized in that a groove for engaging with is formed.