JPS62128870A - Pneumatic type booster - Google Patents

Abstract

PURPOSE:To prevent generation of a condition to give a bad influence of the exhaust gas to the external appliances, by discharging the exhaust gas from a low pressure chamber of the main body through a port furnished at the position apart from the output member. CONSTITUTION:The main body of booster consists of a main body member 2 and a lid member 3, and a movable member 16 is furnished at the main body 1. A n output member 54 is held by pressing its base 54A movable in the front end 18A of the movable member 16, extended to the base 4 side inserting its inserting hole 5A of the recessed part 5 movable freely, and contacted to the rear end of a piston P of a master cylinder through penetrating a seal member 13. As well as the portion of the main body 1 where the output member 54 penetrates is screened airtight against the outer side by the sealing member 13, an exhaust port 6 is furnished at the position apart in the radius direction from the said portion. Therefore, the exhaust gas from a low pressure chamber A does not flow absolutely to the mouth of the master cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a compressed pneumatic booster for assisting the operation of a mask cylinder in a vehicle or the like.

[Conventional technology]

As this type of booster, conventionally, there is a
There is one described in Publication No. 50.

This booster includes a main body formed in an internal space, a movable body that is slidably inserted into the internal space and partitions a variable pressure chamber at one end and a low pressure chamber at the other end, and a A cylindrical part that penetrates a cylindrical opening formed in the main body and protrudes to the outside, an input member that fits into the cylindrical part from the outside, and a supply of compressed air to the variable pressure chamber that is provided in association with the input member. a valve device that controls discharge; an output member that is disposed on the other end side of the movable body and causes the moving force of the movable body to act on an external device;
Said t,? A pair of seals 9 between the 1-shaped opening and the cylindrical portion
a cavity partitioned by a 1% material and connected to an external compressed air source; a passage provided in the cylindrical portion to communicate the cavity with the valve device; and an exhaust passage provided from the valve device to the low pressure chamber. The structure has the following.

When an external input is applied to the input member, the movable body slides within the main body due to the differential pressure between the low pressure chamber, which is at atmospheric pressure level, and the internal pressure of the variable pressure chamber, into which compressed air is introduced, and is applied to the input member. The applied input is doubled and transmitted to the output member, and when the input is removed, it returns to its original state due to the action of the return spring. During this return operation, the compressed air contained in the variable pressure chamber is discharged to the low pressure chamber through the exhaust passage, but in the conventional system, the compressed air discharged to the low pressure chamber is discharged from the main body through which the output member passes. Since it is configured to be discharged to the outside from the insertion hole, that is, from around the output member, it is discharged to the mouth of an external device (mask cylinder) driven by the output member, and the mask cylinder screws 1 to 1 are discharged to the outside. The problem is that back pressure is applied to the cylinder body of the mask cylinder, and as a result, the seal installed between the rear end of the cylinder body of the mask cylinder and the screw cylinder is bent, causing air to enter the cylinder body. was there.

[Purpose of the invention]

This invention was made to solve the above-mentioned conventional problems, and is a compressed air booster in which the exhaust air from the low-pressure chamber does not reach the mouth of external equipment, and there is no risk of the exhaust air entering the external equipment. The purpose is to obtain equipment.

[Structure of the invention]

In order to achieve the above object, the present invention protrudes to the outside through a sealing member that prohibits fluid movement from the low pressure chamber side of the main body to the outside, and connects the low pressure chamber to the outside through one port. It was designed to do so.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes the main body of the booster, which consists of a main body member 2 and a lid member (casing made of aluminum material) 3. The main body member 2 is a cylindrical body with a bottom, and the bottom part 4 includes:
A recess 5 having an insertion hole 5A is formed in the center, and a port (exhaust port) 6 is provided around the outer periphery. 6A is an exhaust stack.

The lid member 3 has a T-shape having a lid portion 7 and a cylindrical opening 8, and the lid portion 7 has one end that opens into the cylindrical opening 8 and extends in the radial direction and the other end that opens into the air supply port 9. A radial passage 10 is formed. This air supply port 9 is connected to an external compressed air source (not shown). The main body member 2 and the lid member 3 are assembled by fitting and fixing the opening side of the main body member 2 onto the annular protrusion 11 protrudingly formed on the end surface of the lid portion 7 of the lid member 3 while pressing the sealing member 11A. connected together. This main body 1 is fixed by a port 12 in a concave portion 5 of a bottom portion 4 serving as the front end of the device, in contact with a flange portion (not shown) formed near the rear end of the mask cylinder main body M indicated by a chain line.

A sealing member 3 is interposed between the rear end surface of the mask cylinder body M and the bottom of the four parts 5. Note that the lid member 3 is fixed to a toe board (not shown) with bolts 14 and 15.

A T-shaped movable member 16 made of aluminum is disposed within the main body 1. This movable member 16 consists of a large-diameter movable body 17 and a small-diameter cylindrical portion 18, and the movable body 17 includes:
A sealing member 20 is fitted into the outer circumferential groove 19 and is slidably housed within the main body member 2.
The cylindrical portion 18 is slidably inserted into the cylindrical opening 8 while being sealed by a sealing member 21, 22, and the rear end portion of the cylindrical portion 18 protrudes outward from the rear end portion 8A of the cylindrical opening 8. There is. A spring receiver 23 having a hole 23A is formed on the outer periphery of the front end 18A of the cylindrical portion 18 that protrudes from the center of the front surface of the movable body 17 of the movable member 16, and a gap g is formed between the spring receiver 23 and the base portion of the front end 18A. The movable member 16 is biased rearward by a return spring 24 interposed between the spring receiver 23 and the bottom 4 of the main body member 2, and the movable member 16 is normally The outer periphery of the rear surface of F is press-fitted to the end surface of the annular projection 11, creating a low pressure chamber A between the movable body 17 and the bottom 4 of the main body member 2, and a low pressure chamber A between the movable body 17 and the inner surface of the lid portion 7 of the lid member 3. Transformer room B
is defined. The sealing member 21 is fitted inside the rear end portion 8A of the cylindrical opening 8 having an inward circumferential protrusion to seal between the cylindrical opening 8 and the cylindrical portion 18. A space is separated between the inward circumferential protrusion of the rear end portion 8A and the outer circumferential surface of the cylindrical portion 18. Further, the sealing member 22 is interposed in front of the opening position of the radial passage 10 of the cylindrical opening 8 and is prevented from coming out by a retaining member 26 via a backup ring 25 to prevent the cylindrical portion 18 and the cylindrical opening 8 from coming out. A guiding sleeve 27 is inserted into a space sealed by a sealing member 21, 22 between the cylindrical opening 8 and the cylindrical portion 18. This sleeve 27 is made of a plastic material, and has guide protrusions 28a extending in the axial direction at predetermined intervals in the circumferential direction on its inner peripheral surface, as shown in FIGS. 2A and 2B. Both have an outer circumferential groove 28b near the front end 29 and are inscribed in the cylindrical opening 8 on the outer circumferential surface, and the cylindrical portion 18
In cooperation with the sealing members 21, 22, a cavity C is defined between the two. This cavity C passes through a plurality of through holes 28c formed in the outer circumferential groove 28b of the sleeve 27, and the radial passage 10
It communicates with The front end 29 of the sleeve 2 is shaped like a socket and has a larger inner diameter than other parts, and the lip 22a of the sealing member 22 fits into this socket.

Inside the cylindrical portion 18 is a stepped hole 30, into which a plunger 31 is inserted and the output shaft 5 is inserted.
The base portion 54A of No. 4 is housed and held. Plunger 31
The front end 32 has a small diameter and the rear end 33 has a large diameter, and includes a passage 34 that opens at the end surface of the front end 32 and extends in the axial direction, and a passage that communicates with the passage 34 and radially penetrates the rear end 33. 35
The outer periphery of the front surface of the rear end portion 33 is formed as a valve seat 36. The plunger 31 is
The front end portion 32 is slidably inserted into the small diameter portion 37 of the stepped hole 30 via a sealing member 38, and the rear end portion 33 is sealed and internally fitted into the rear half portion of the cylindrical portion 18 by a sealing member 39. The sleeve 42 is sealed with a sealing member 43 and slidably inserted into the sleeve 42 which is prevented from coming out by a stopper member 41 via a stopper ring 40, and is pressed backward by a return spring 44 so that the outer circumference of the rear end surface is provided on the sleeve 42. The inner circumferential projection 45 is engaged with the inner circumferential projection 45 . This return spring 44 is interposed between a stepped surface 46 of the stepped hole 30 and an outer peripheral projection 47 formed on the plunger 31. A radial passage 48 is formed in the cylindrical portion 18, one end of which opens toward the portion 30a of the stepped hole 30 from which the tip of the plunger front end 32 projects, and the other end communicates with the variable pressure chamber B. A diagonal passage 49 is formed with one end opening toward the section surface 46 and the other end opening toward the gap g. sleeve 4
The front end of 2 protrudes from the front surface of the rear end 33 of the plunger 31 and is between the outer peripheral surface of the rear end 33 of the plunger 31,
It has an inner diameter that separates the chamber GA into which the passage 35 opens, and the tip of the front end portion is formed as a valve seat 50 .

In front of the sleeve 42 of the stepped hole 30, there is a stepped cylindrical valve piston 51 which separates a chamber between it and the outer peripheral surface of the plunger 3I and defines a chamber E between it and the inner peripheral surface of the cylindrical portion 18. It is provided so as to be slidable on the inner peripheral surface of the hole 30. As shown in FIG. A valve rubber 53 is fitted into the flange to cover the rear end surface of the valve piston, and is biased rearward by a valve spring 51A housed in the chamber E, so that the valve is normally closed. The rubber 53 is the valve seat 50
is seated. At this time, the valve seat 3G faces the valve rubber 53 with a predetermined distance therebetween. The valve piston 51 and the valve seat 50 constitute an air supply valve, and the valve piston 51 and the valve seat 36 constitute an exhaust valve.

The output member 54 is held with its base 54A movably press-fitted into the front end 18A of the movable member 16.
It loosely fits into the insertion hole 5A, passes through the sealing member 13, and comes into contact with the rear end surface of the piston P of the mask cylinder. This sealing member 13 blocks an air flow path leading from the low pressure chamber to the outside via the insertion hole 5A. Reference numeral 55 denotes a reaction force member made of rubber, which is disposed within the front end portion 18A, and a small-diameter pressure receiving member 56 movably fitted into the portion 30a of the stepped hole 30 on the rear end side. It is arranged to allow bullet contact. The pressure receiving member 56 is formed with a circumferential groove 56A facing one end of the radial passage 48 and a plurality of axial notches 57 that communicate with the circumferential groove 56A and open at the rear end surface. Normally, there is a gap between the tip and the tip surface.

Reference numeral 58 denotes a manual member (push rod), which is linked to a brake pedal (not shown), is inserted from the outside into the cylindrical portion 18 of the movable member 16, and its spherical tip end is located at the center of the rear end surface of the plunger 31. A concave portion 5 provided in the
9 and is pivotable and fixed by caulking.

A boot 60 covers the cylindrical opening 8 of the lid member 3 and the rear end of the cylindrical portion 18 of the movable member 16.

[Effect]

Next, the operation of this device will be explained.

When the brake pedal (not shown) is depressed to move the input member 58 to the left in the figure, the plunger 31 is driven in the same direction against the return spring 44, and the valve seat 36 abuts and engages the valve rubber 53. , the exhaust valve closes and the chamber is isolated from the low pressure chamber.

Further, when the brake pedal is depressed, the valve seat 50 separates from the valve rubber 53, and the air supply valve opens. When the air supply valve opens, compressed air is supplied from an external compressed air source (not shown) to the chamber through the path of air supply port 9 - radial passage 10 - through hole 28 c - cavity C - through hole 52 - chamber E. Introduced within GA. Room GA
The compressed air introduced into the plunger 31 passes through the passage 3 inside the plunger 31.
5.34, is guided into the variable pressure chamber B through the notch 57, the circumferential groove 56, and the passage 48. As a result, the internal pressure in the variable pressure chamber B rises higher than the internal pressure (atmospheric pressure) in the low pressure chamber A, so the differential pressure between the side internal pressures acts on the movable body 17, and the differential pressure causes the movable member 16 to move due to the spring force of the return spring 24. The output member 5 moves to the left against the
4 drives the piston P of the mask cylinder. A part of the reaction force from the output member 54 is transferred to the reaction force member 55 and the pressure receiving member 56.
When this reaction force reaches a magnitude corresponding to the input applied to the input member 58, an equilibrium state is reached in which the valve rubber 53 is seated on both the valve seat 36 and the valve seat 50, and the valve rubber 53 is movable. Member 16 stops moving.

When the brake pedal is released, the input applied to the plunger 31 through the input member 58 disappears, so the plungers 1 to 31 are driven to the right by the action of the return spring 44, the intake valve closes, and the exhaust valve closes. The valve returns to the illustrated state where the valve is open. As a result, the compressed air in the variable pressure chamber B is transferred to the passage 4.
8. Enters the chamber from the chamber GA through the circumferential groove 56A, the notch 57, and the passages 34 and 35 in the plunger 31, and enters the diagonal passage 49.
It flows out through the gap g. Since the air flow passage from the insertion hole 5A to the outside is blocked by the sealing member 13, the compressed air flowing out into the low pressure chamber A is transferred from the port 6 to the exhaust pipe 6A.
is discharged to the outside of the device. As a result, the internal pressure of the variable pressure chamber B becomes atmospheric pressure, so that the movable member 16 is moved by the return spring 24.
is driven to the right by the action of and returns to the state shown in the figure.

In this embodiment, the portion of the main body 1 through which the output member 54 passes is hermetically shielded from the outside by the sealing member 13, and an exhaust port 6 is provided at a position away from the portion in the radial direction of the main body. Therefore, the exhaust gas from the low pressure chamber is not blown out toward the mouth of the mask cylinder body M, and therefore, this exhaust gas deforms the seal between the mask cylinder body M and the piston P and causes the inside of the mask cylinder body M to flow out. There will be no such situation where an intrusion occurs. Furthermore, in this example,
Since the exhaust pipe 6A is connected to the port 6 so as to be parallel to the mask cylinder body M, the exhaust from the low pressure chamber A will never flow to the mouth of the mask cylinder, and the above effect will be more reliable. .

As described above, in this embodiment, the compressed air is exhausted from the low pressure chamber A through the port 6 in a form that is easy to reuse. It is possible to effectively utilize the desiccant stored therein, such as by recycling it.

〔Effect of the invention〕

As explained above, this invention has a configuration in which the exhaust from the low pressure chamber of the main body is exhausted from the port provided at a position away from the output member that protrudes from the main body and acts on the external equipment, so that the exhaust air is discharged from the external equipment. It is possible to reliably prevent the occurrence of a situation in which the external device enters the external device and adversely affects the operation of the external device.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing an embodiment of the present invention, Fig. 2(a)
is a perspective view of the sleeve in the above embodiment, FIG.
is a sectional view of the sleeve in the above embodiment. ■・-・Main body, 6-port, 8-cylindrical opening, 13-・
・Sealing member, 17-movable body, 18-cylindrical part, 36.50-
Valve seat, 51-・Valve piston, 54-・Output member, 58-
・-Manual parts, A-Low pressure room, B-・Transformation room, C-・-
Blank space.

Claims (1)

[Claims] A main body formed in an internal space, a movable body that is slidably inserted into the internal space and partitions a variable pressure chamber at one end and a low pressure chamber at the other end, and a cylinder formed in the main body from one end of the movable body. a cylindrical portion that protrudes to the outside through a shaped opening; an input member that fits into the cylindrical portion from the outside; and a valve device that is provided in association with the input member and controls supply and discharge of compressed air to and from the variable pressure chamber. an output member disposed on the other end side of the movable body to apply the moving force of the movable body to an external device; and an external compression member partitioned between the cylindrical opening and the cylindrical part by a pair of sealing members. A compressed pneumatic booster comprising a cavity connected to an air source, a passage provided in the cylindrical portion to communicate the cavity with the valve device, and an exhaust passage provided from the valve device to the low pressure chamber. In the apparatus, the output member protrudes to the outside through a sealing member that prohibits fluid movement from the low pressure chamber side to the outside, and the low pressure chamber is connected to the outside through one port. booster.