JPS633549Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a two-system brake valve used in an air brake system for vehicles and the like.

Conventionally, this type of product has a main body formed by combining an upper main body and a lower main body, a first cylinder hole formed in the upper side of the upper main body, and the upper main body and the lower main body. a second cylinder hole, a main piston that is movably inserted into the first cylinder hole to define a first reaction force chamber on the lower side and to which input is transmitted to the upper side; and a main piston that moves relative to the main piston by a predetermined distance. a relay piston having a shaft portion that can be connected to the relay piston and movably inserted into the second cylinder hole; a relay chamber formed on the upper surface side of the relay piston in communication with the first reaction force chamber; and a lower surface of the relay piston. a second reaction force chamber formed on the side; a cylindrical first valve body that fits on the outer periphery of the shaft portion and is movably arranged opposite to the lower part of the main piston; and a lower part of the shaft portion. a second valve body movably disposed opposite to the second valve body; an exhaust portion formed below the second valve body and communicating with the outside air; The reaction force is formed by an exhaust passage that can communicate with the chamber, a through hole that is provided in the second valve body and that connects the exhaust part and the exhaust passage, and a seat that is provided on each of the valve bodies and the main body. first and second blocks that cut off communication between the chamber and the pressure source;
One is known that includes a supply valve, and first and second exhaust valves that are formed by each of the valve bodies and seats provided on each of the pistons and that cut off communication between each of the reaction force chambers and the outside air. . Furthermore, recently, a sealing device is provided on the outer periphery of the relay piston to separately seal the relay chamber and the second reaction force chamber. This means that if a single sealing member is used to seal between the Lee chamber and the second reaction chamber, if this sealing member is damaged, the system in the relay chamber or the system in the second reaction chamber will be damaged. If a failure occurs in which the pressure does not rise in either system, the pressure in the normal system will leak due to damage to this sealing member.
This addresses the problem of not being able to ensure normal system operation.

However, simply providing a double sealing device around the outer periphery of the relay piston makes it impossible to confirm damage to the sealing device, which poses a serious problem in that the relay piston is used for a long period of time with damage.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a two-system brake valve that allows damage to the sealing device to be reliably recognized. This purpose, according to the present invention, includes a main body formed by combining an upper main body and a lower main body, a first cylinder hole formed on the upper side of the upper main body, and a first cylinder hole formed by the upper main body and the lower main body. a second cylinder hole; a main piston that is movably inserted into the first cylinder hole, defines a first reaction force chamber on the lower surface side, and transmits input to the upper surface side;
a relay piston having a shaft connected to the main piston so as to be movable relative to the main piston by a predetermined distance and movably inserted into the second cylinder hole; and an upper surface side of the relay piston communicating with the first reaction force chamber. a second reaction force chamber formed on the lower surface side, and a first cylindrical chamber fitted on the outer periphery of the shaft portion and movably arranged opposite to the lower part of the main piston. a valve body, a second valve body movably disposed facing below the shaft, an exhaust part formed below the second valve body and communicating with outside air, and the shaft and the relay piston. an exhaust passage that can penetrate and communicate with the first reaction force chamber; a through hole provided in the second valve body that communicates the exhaust section and the exhaust passage; and an exhaust passage that is provided in each of the valve bodies and the main body. first and second supply valves that are formed by a seat and cut off communication between each of the reaction force chambers and the pressure source; and first and second supply valves that are formed by each of the valve bodies and a seat provided on each of the pistons and that are formed by each of the reaction force chambers and the pressure source. A two-system brake comprising first and second exhaust valves that cut off communication with outside air, and a sealing device that separately seals the relay chamber and the second reaction chamber on the outer periphery of the relay piston. In the valve, the relay piston is connected to an upper member that partitions the relay chamber and the second
a lower member that partitions a reaction force chamber, and a sealing device for the relay chamber is provided in the upper member, a sealing device for the second reaction force chamber is provided in the lower member, and both sealing devices are provided. A spacer is interposed between the upper body and the lower body to communicate with the exhaust passage through a passage formed between the upper member and the lower member, and to ensure a travel length of the relay piston. This is achieved by a dual system brake valve.

Hereinafter, a two-system brake valve according to an embodiment of the present invention will be explained with reference to the drawings.

In Fig. 1, the two-system brake valve is indicated as 1 as a whole, and its valve body 2 consists of a lid body 4, an upper body 6, and a lower body 5, each having a hole 3 for attachment to a toe board at one end. The body 4 and the upper body 6 are fixed by bolts 101, and the upper body 6 and the lower body 5 are fixed by bolts (not shown) via a spacer 90. The opening of the lower body 5 is covered by a lid member 77 that constitutes an exhaust section.

A gasket seal 91 is interposed between the spacer 90 and the upper body 6, and a seal ring a is interposed between the spacer 90 and the lower body 5 to seal between the outside and the inside. The upper body 6 and the lower body 5 form a body that houses the main components described in detail below.

A plunger support hole 7 is provided approximately in the center of the lid body 4.
is formed, into which a pusher 9 made of oil-impregnated sintered metal is press-fitted and fixed. This pushup 9
A substantially cup-shaped plunger 10 is slidably fitted into the hole 8 . A stopper 11 fixed to the top of the plunger 10 by a method such as welding is attached to a brake pedal 13 whose upper surface is covered with a rubber plate 12.
The roller 15 is in contact with the circumferential surface of a roller 15 which is supported by a shaft 14. The brake pedal 13 is swingably attached to the lid 4 by a rotary shaft 17 that is rotatably supported by the lid 4 via a bearing 16 . bolt 1
8 is an adjustment bolt for adjusting the non-operating position of the brake pedal 13, and 19 is a fixing nut.

The plunger boot 20 has a small hole 20a, the upper end of which fits into the upper outer periphery of the plunger 10, and the lower end thereof airtightly fits into an annular groove 21 formed by the outer periphery of the lid 4 and the pusher 9. And it is installed.

A piston 25 having a seal member 24 attached to its outer periphery is slidably fitted into the upper cylinder hole 23 of the upper body 6, and a first reaction chamber communicating with the first output port 26 is provided below the piston 25. A first control pressure chamber 27 is formed. An operating device of one system is connected to the first output port 26 via a pipe (not shown). A rubber spring 30 constituting a reaction spring is disposed between the upper surface of the piston 25 and a push plate 29 that is slidably guided by the shaft portion 28 of the piston 25 and abuts the lower end of the plunger 10 on the upper surface. is intervening.

Further, a first input port 35 is formed in the upper body 6 at the same level as and opposite to the first output port 26 described above, and these first output ports are used to define a first control pressure chamber 27 within the hole 23. A first partition wall 6 a is formed integrally with the upper body 6 at a position between the upper body 6 and the first input port 35 . The first partition wall 6a has a valve hole 32, and a cylindrical valve member 34 covered with a rubber member 33 forming a seat surface on the upper surface is disposed inside the valve hole 32. A first input chamber 36 communicating with the first input port 35 is formed therein. A compressed air source is connected to the first input port 35 via a pipe (not shown).

The above-mentioned valve member 34 is urged upward by a valve spring 37, and is pushed through the rubber sheet surface 33 into an inner air supply valve seat 39 formed at the upper end of the valve hole 32 of the first partition wall 6a. In the normal state, it is in contact with the side protrusion as shown in the figure. Further, a flange 38 serving as an exhaust valve seat is provided at the lower end of the piston 25 to the valve member 3.
It is formed so that it can be seated on the seat surface 33 of No. 4.
The valve member 34 and the exhaust valve seat 38 constitute a first exhaust valve 40a, and the valve member 34 and the intake valve seat 3 constitute a first exhaust valve 40a.
9 constitutes the first supply valve 40b.

The lower end of the valve hole 32 of the first partition wall 6a and the valve member 3
Seal rings 41 and 42 are provided between the outer circumferential surface of
, and an annular member 44 which is prevented from coming off by a retaining ring 43 via a seal ring presser plate 46 is disposed. The first input chamber 36 is airtightly partitioned from the lower cylinder hole 49 of the upper body 6 by the annular member 44 .

A relay piston 47 is slidably fitted into the lower cylinder hole 49, but according to the present invention, unlike conventional brake valves, the joint structure is made up of two members. That is, the relay piston 47 consists of an upper piston part 47a and a lower piston part 47b, which are connected to a plurality of bolts 94 and nuts 95.
integrated by. In addition, the relay piston 47
A seal ring 96 is tightly fitted around the shaft portion of the bolt 94 to maintain airtightness between the upper and lower sides. Further, a groove 93 having a small flow passage cross-sectional area is formed in the radial direction on the upper surface of the lower piston part 47b, and by integrating it with the upper piston part 47a, the inner peripheral side of the relay piston 47, that is, the exhaust passage 54 is formed.
A passage is formed that communicates the outer peripheral side with the outer peripheral side. Further, an annular notch is formed on the outer periphery of both piston parts 47a and 47b, and an annular groove is formed on the outer periphery by integrating these 47a and 47b.
An annular sealing member 92, clearly shown in FIG. 2, is attached here. This sealing member 92 includes a pair of upper and lower bulges 92a and 92b and a thin wall portion 9 that connects them.
2d, and small holes 92c are formed at regular intervals in this thin portion 92d. Swollen parts 92a, 92
b perform a sealing action independently, and if any of them is damaged, the small hole 92c and the groove 9 between this bulge and the inner wall surface of the upper body 6.
3, compressed air is led to the exhaust passage 54.

The relay piston 47 equipped with the sealing member 92 as described above is slidably inserted into the cylinder hole 49, and the relay chamber or relay chamber 45 is located above the relay piston 47, and the lower body 5 is located below the relay piston 47. A second control pressure chamber 51 as a second reaction force chamber is formed by the second partition wall portion 5a integrally formed with the second partition wall portion 5a.
The relay chamber 45 connects to the first control pressure chamber 2 through a through hole 48 formed at the lower end of the first partition wall 6a.
It is connected to 7. A second output port 50 is also formed in the lower body 5, with which the second control pressure chamber 51 communicates. The second output port 50 is connected to the operating equipment of the other system via piping (not shown).

The upper piston part 47a of the relay piston 47 has a cylindrical part 53 in its center, and this cylindrical part 53 is fitted with a seal ring and slidably fitted into the hole 52 of the valve member 34. There is. Further, the above-mentioned exhaust passage 54 is formed inside this, and this exhaust passage 54 passes through the groove-shaped opening 55 formed on the upper end side of the cylindrical part 53, and in the normal state shown in the figure, the first control It communicates with the pressure chamber 27. Cylindrical part 53
The connecting bolt 56 connects to the cylindrical connecting member 8 from below.
3, and this connecting bolt 56 is fitted into a through hole formed in the shaft-shaped portion 28 of the piston 25 and extends upward, and its upper end is inserted into the space inside the plunger 10. 22 and is fixed to the piston 25 by a nut 58 via an abutment member 59. The large diameter part of the above-mentioned communication member 83 is slidably inserted into the center hole formed in the top wall of the cylindrical part 53 of the relay piston 47, and a spring is attached to the stepped part between the large diameter part and the small diameter part. The receiving ring is brought into contact with the spring receiving ring, and a preload spring 57 is stretched between the spring receiving ring and the head of the connecting bolt 56.

Therefore, the relay piston 47 is urged upward by the preload spring 57 via the spring receiving member. On the other hand, a differential pressure eliminating spring 6 is provided in a compressed state between the relay piston 47 and the first partition wall 6a.
2 is tensioned, and urges the relay piston 47 downward. However, since the spring force is greater in the preload spring 57 described above, under normal conditions the relay piston 47 is in the position shown.
The action and effect of the differential pressure canceling spring 62 are described in detail in, for example, Japanese Patent Publication No. 1983-27870.
Briefly stated here, the first output port 26 and the second output port 50 due to the sliding resistance generated when the relay piston 47 moves downward and the valve closing force of the second supply valve 71b described below. It works to greatly reduce the differential pressure at

Further, a second input port 66 is formed in the lower body 5 at the same level as and opposite to the second output port 50 described above, and a second control pressure chamber 51 as a second reaction force chamber is defined in the hole 49. In order to achieve this, a second partition wall portion 5a is integrally formed with the lower body 5 at a position between the output port 50 and the input port 66. This second partition wall portion 5a also has a valve hole 63, and a cylindrical valve member 64 covered with a rubber member 68 forming a seat surface on the upper surface is disposed in this valve hole 63, and a cylindrical valve member 64 is disposed around the valve member 64. 2nd input port 66
A second input chamber 67 is formed which communicates with the second input chamber 67 . A compressed air source is connected to the second input port 66 via a pipe (not shown).

The valve member 64 is urged upward by a valve spring 65, and an inward protrusion serving as an air supply valve seat 70 formed at the upper end of the valve hole 63 of the second partition portion 5a is inserted through the rubber sheet surface 68. In the normal state, they are in contact as shown in the figure. Further, a flange 69 serving as an exhaust valve seat is provided at the lower end of the relay piston 47 for the valve member 6.
It is formed so that it can be seated on the seat surface 68 of No. 4.
The valve member 64 and the exhaust valve seat 69 constitute a second exhaust valve 71a, and the valve member 64 and the intake valve seat 7 constitute a second exhaust valve 71a.
0 constitutes the second supply valve 71b.

The lower end of the valve hole 63 of the second partition portion 5a and the valve member 6
Similarly to the first supply/discharge valves 40a, 40b, seal rings 72, 73 are installed between the valves 4 and 4, and are prevented from coming off by the flange portion 72' of the lid member 77 via the seal ring press plate 74. An annular member 76 is arranged. The second input chamber 67 is airtightly partitioned from the atmosphere by the annular member 76 . Like the valve member 34 of the first supply/discharge valves 40a, 40b, this valve member 64 is also slidably and airtightly guided in the center hole of the annular member 76. Further, the central hole of the valve member 64 forms an exhaust passage 81, and this passage 81 is always in communication with the exhaust passage 54 in the relay piston 47, and in the normal state shown in the figure, it is connected to the second control pressure chamber 51. It's communicating.

A lid member 7 integrally fixed to the lower end of the lower body 5
7 is fitted with a rubber dust cover 78, whose flat plate part 79 normally comes into elastic contact with the lower surface of the lid member 77 as shown in the figure, thereby establishing communication between the exhaust passage 81 and the atmosphere. However, the exhaust passage 8 is blocked from the first and second control pressure chambers 27 and 51.
When the compressed air is discharged to 1, the flat plate portion 79 is deformed by the pressure, and the compressed air is discharged to the outside through the through hole 80 of the lid member 77.

The embodiment of the present invention is configured as described above,
This effect will be explained below.

When the brake is not applied, each part of the brake valve 1 is in the illustrated position, and the valve member 34 of the first supply/discharge valve 4a, 40b is seated on the intake valve seat 39 and separated from the exhaust valve seat 38. sitting. Therefore,
The first control pressure chamber 27 is isolated from the first input chamber 36, communicates with the exhaust passage 54, and is at atmospheric pressure. On the other hand, the valve members 64 of the second supply/discharge valves 71a, 71b are also seated on the intake valve seat 70, and are also spaced from the exhaust valve seat 69. Therefore, the second control pressure chamber 51 is also cut off from the second input chamber 67 and communicated with the exhaust passage 81 to be at atmospheric pressure.

Now, to apply the brakes, brake pedal 1
3, the brake pedal 13 swings around the rotating shaft 17, and the plunger 10 is pushed down by the roller 15. As a result, the piston 25
receives a downward biasing force via the push plate 29 and the rubber spring 30, and moves downward against the spring 31. Correspondingly, the relay piston 47 also moves downward under the biasing force of the differential pressure canceling spring 62 while in contact with the spring receiving member.

Further, the piston 25 moves downward, and the piston 2
An exhaust valve seat 38 formed at the lower end of the exhaust valve seat 38 is seated on the first valve member 34 to connect the first control pressure chamber 27 to the exhaust passage 5.
4, the valve member 34 is removed from the air supply valve seat 39. As a result, the compressed air in the first input chamber 36 flows into the first control pressure chamber 27 .
From here, the compressed air is supplied to one of the operating devices through the first output port 26 and flows into the relay chamber 45 through the through hole 48. This compressed air acts on the relay piston 47, and the second supply/discharge valve 71a,
The valve member 64 of 71b is opened. That is, the relay piston 47 slightly compresses the spring 57 and moves downward, and the exhaust valve seat 69 formed at the lower end of the relay piston 47 seats on the seat surface 68 of the valve member 64, thereby opening the second control pressure chamber. 51 to exhaust passage 54,8
1, the air supply valve seat 70 is removed from the seat surface 68 of the valve member 64, thereby communicating the second control pressure chamber 51 with the second input chamber 67. As a result, the second input port 66 is connected to the second output port 50.
Compressed air is supplied to the other operating equipment through.

Then, when the pressure in the first control pressure chamber 27 rises to a value corresponding to the pushing force applied to the plunger 10 from the brake pedal 13, the piston 25 moves slightly upward, and the valve member 34 moves to the air supply valve seat. 3
9, the pressure in the first control pressure chamber 27 is maintained at a predetermined value. At the same time, the second control pressure chamber 5
1 rises to the pressure in the relay chamber 45, the valve member 64 in the second air supply/discharge valve 71 also closes to the air supply valve seat 7.
0, the pressure in the second control pressure chamber 51 is also maintained at a predetermined value.

To release the brake, press the brake pedal 13.
When the pedal force applied to the piston 25 is removed, the piston 25 moves upward due to the pressure in the first control pressure chamber 27 and the spring force of the spring 31, and the exhaust valve seat 38 is separated from the seat surface 33 of the valve member 34. , first control pressure chamber 27
communicates with exhaust passages 54 and 81. At the same time, the relay piston 47 also moves upward due to the pressure in the second control pressure chamber 51 and the spring force of the spring 57 transmitted via the spring receiving member that comes into contact with the top of the cylindrical portion 53 of the relay piston 47. Move and exhaust valve seat 6
9 is separated from the seat surface 68 of the valve member 64, and the second control pressure chamber 51 communicates with the exhaust passage 81. In this way, the compressed air in each control pressure chamber 27, 51 passes through the exhaust passages 54, 81, deforms the flat plate portion 79 of the dust cover 78, and is discharged to the outside from the through hole 80.

The brake valve 1 of this embodiment has the above-described structure and operation, but also has the following effects.

That is, the piping system connected to the first supply and discharge valves 40a and 40b and the second supply and discharge valves 71a and 71
Even if an air leak failure occurs in one of the piping systems connected to side b, the sealing member 92 attached to the outer periphery of the relay piston 47
If either of the bulging portions 92a, 92b is sealed, the braking action of the normal piping system can be ensured. However, in a brake valve in which only one ordinary seal ring is attached to the outer periphery of the relay piston 47, as mentioned at the beginning of this specification, if this seal ring is damaged and loses its sealing effect, the first control The pressure chamber and the second control pressure chamber come into communication, and the braking action in the normal system is also lost.

Also, a passage 93 extends in the radial direction of the relay piston 47.
is formed, so that the bulge 9 of the sealing member 92
It is possible to check whether 2a and 92b are normal. That is, apply soapy water to the outer edge of the dust cover 78 attached to the lid member 77 constituting the exhaust section, and then press the brake pedal 1.
Press 3. At this time, if the bulges 92a, 92
If either of the parts b is damaged and the seal is not sealed, compressed air will leak to the outside through the passage 93 and the exhaust passages 54 and 81. As a result, soap bubbles are formed on the outer edge portion of the dust cover 78. Swelling part 9
The sealing performance of 2a and 92b can be checked.

Further, the same molds as those for the upper and lower bodies of the brake valve, in which only one conventional seal ring is attached to the outer periphery of the relay piston 47, can be used. In other words, the upper body 6 and lower body 5 of this embodiment can be obtained without changing the shapes of the molds for the upper body and lower body in the case of one seal ring. This is because the spacer 61 is interposed to ensure the necessary stroke length for the relay piston 47.

Furthermore, since the relay piston 47 is of a split type and a groove 93 is formed on the upper surface of one of the piston parts 47b, it is possible to check the sealing property of the sealing member or seal ring attached to the outer circumference of the relay piston 47. It is easy to form a passage for this purpose.

Each embodiment of the present invention has been described above, but
Of course, the present invention is not limited to these, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, the bulges 92a, 92
A sealing member 92 was used in which b was integrated.
Alternatively, separate seal rings 97a and 97b may be used as shown in FIG. In this case, the above-mentioned groove 93 is not formed in the lower piston part 47b' of the relay piston 47, but instead a plurality of protrusions 98 are provided on the lower surface of the upper piston part 47a'.
As a result, when both piston portions 47a' and 47b' are connected, a slit-like space having a small flow passage cross-sectional area may be formed between them as shown in the figure.

Note that the shape of the spacer 90 is not limited to the one shown in the drawings, and can take various shapes as long as the stroke length of the relay piston 47 is compensated. It is desirable to have a shape that does not interfere with each other.

As described above, according to the dual-system brake valve of the present invention, the relay piston is formed by combining the upper member that partitions the relay chamber and the lower member that partitions the second reaction force chamber, and A sealing device for the relay chamber is provided on the upper member, and the second
a sealing device for the reaction force chamber is provided in the lower member, and the two sealing devices are connected to the exhaust passage via a passage formed between the upper member and the lower member,
Since a spacer is interposed between the upper body and the lower body to ensure the travel length of the relay piston, by applying soapy water to the outer surface of the exhaust part and operating the valve, the sealing device is completed. If the soap is damaged, the soap may swell in the form of soap beads.
Damage can be reliably recognized. Further, since the relay piston is divided into upper and lower parts, and a passage is formed between the divided surfaces, it is easy to form the passage. Also,
The conventional single-piece relay piston upper and lower bodies can be made and used as they are.
The number of sealing members is also not increased compared to the conventional one.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a two-system brake valve according to an embodiment of the present invention, FIG. 2 is a partially enlarged perspective view of a sealing member in FIG. 1, and FIG. It is a partially enlarged sectional view showing a modification. In the figure, 1...brake valve, 2...
...Valve body, 5...Lower body, 6...Upper body, 23,
49...Cylinder hole, 25...Piston, 34,
64... Valve member, 40a... First exhaust valve, 40b
...First supply valve, 47...Relay piston, 47
a... Upper piston part, 47b... Lower piston part, 54, 81... Exhaust passage, 61, 90... Spacer, 71a... Second exhaust valve, 71b... Second
Supply valve, 77... Lid member, 92... Sealing member, 9
2a, 92b... bulge, 93... groove (passage).

Claims (1)

[Scope of utility model registration request] A main body formed by combining an upper main body and a lower main body,
A first cylinder hole formed on the upper side of the upper body, a second cylinder hole formed by the upper body and the lower body, and a first cylinder hole movably inserted into the first cylinder hole and on the lower side. a main piston that divides a force chamber and transmits an input to the upper side; a relay piston that is movably inserted into the second cylinder hole and has a shaft portion that is movably connected to the main piston by a predetermined distance; A relay chamber is formed on the upper surface side of the relay piston in communication with the first reaction force chamber, and a second reaction force chamber is formed on the lower surface side of the relay piston. a cylindrical first valve body that is movably arranged opposite to the lower part of the shaft, a second valve body that is movably arranged opposite to the lower part of the shaft, and a lower side of the second valve body. an exhaust passage formed in the second valve body and communicating with the outside air; an exhaust passage that passes through the shaft portion and the relay piston and communicates with the first reaction force chamber; first and second supply valves that are formed by each of the valve bodies and a seat provided in the main body and that cut off communication between each of the reaction force chambers and the pressure source; and each of the valve bodies and first and second exhaust valves that are formed by seats provided on each of the pistons and cut off communication between each of the reaction force chambers and the outside air; In a two-system brake valve provided with a sealing device that performs separate sealing for each chamber, the relay piston is coupled to an upper member that partitions the relay chamber and a lower member that partitions the second reaction force chamber. At the same time, a sealing device for the relay chamber is provided on the upper member, a sealing device for the second reaction force chamber is provided on the lower member, and a space between the two sealing devices is provided between the upper member and the lower member. A spacer is interposed between the upper body and the lower body to communicate with the exhaust passage through a passage formed in the exhaust passage, and to ensure a moving length of the relay piston.
System brake valve.