JPS62198555A - Brake valve - Google Patents

Abstract

PURPOSE:To make spring set load adjusting work for an elastic device so simple and easy, by forming a stopper with the screw member attached to a movable body in making an engaging position with a spring bearing alterable to an axial direction. CONSTITUTION:In case of a shortage of set load in a main spring 20, a lower screw member 19B is rotated to the right, screwing it downward, a height position of a spring bearing 14 is made to go down, and the main spring 20 is yet more compressed. And, after it is adjusted as far as the specified height, an upper screw member 19A for whirl-stop is rotated in the same sense, and an upper screw member 19A is rotated in the same sense, thus adjusting work is completed. When the set load is imposed too much, reverse operation to the above-mentioned one is carried out. Thus, only when the lower screw mem ber 19B is merely operated for rotation, the set load of the spring 20 is adjust able and, what is more, it can be done from a hole 60 of a cover member 61 as well, thus the adjusting work is made so simple enough as compared with the case that plural members are removed for inserting shims under a stopper, so that a burden on an operator is sharply reducible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a brake valve used in an air brake device for a vehicle or the like.

[Conventional technology]

Conventionally, this type of brake valve is
There is one described in Publication No. 178960.

The brake valve has an inlet connected to an air reservoir;
An outlet connected to a brake circuit, a valve device provided in a passage communicating the inlet and the outlet, a movable body disposed so as to be movable opposite to each other so as to be able to open and close the valve device, and a valve of the movable body. a pressure chamber formed on the device side to allow the movable body to receive the outlet side pressure in a direction to close the valve device; and a pressure chamber provided on the opposite side of the movable body from the valve device side to receive input from the brake pedal. and an elastic device for transmitting power to the movable body.

[Problem that the invention seeks to solve]

This elastic device is preloaded so that the relationship between the amount of brake depression and the output pressure of the brake valve, that is, the performance characteristics, meets a predetermined standard, but the magnitude of this preload (set load) is determined by the spring This is determined by the vertical position of a stopper whose one end engages with the upper surface of the spring receiver that comes into contact from below to regulate the compression height of the spring. It has a structure in which it is fixed with a nut screwed onto the upper end of a support rod extending into the main body, and the position of the stopper, and thus the above-mentioned planned load, is adjusted by inserting a shim into the lower surface of the stopper.

Therefore, when adjusting the preload, many parts including the stopper, elastic device, support rod, etc. must be removed from the valve body and reassembled in order to insert the shim, which is a tedious task. There was a problem that it was necessary.

This invention was made to solve the above problem.
To obtain a brake valve that allows easy adjustment of the set load of a spring of an elastic device with simple work.

[Means to solve the problem]

In order to achieve the above object, the present invention forms a stopper by a screw member screwed onto a movable body so that the engagement position with the spring receiver can be changed in the axial direction.

[Embodiments of the invention]

The figure shows an embodiment of the present invention in a longitudinal cross-sectional view.
1 shows the entire two-system brake valve for automobiles. Reference numeral 2 denotes a valve body, which is constructed by vertically fitting and connecting an upper body 3 and a lower body 4, and has a cylinder hole 5 in the cylinder 1 that penetrates vertically, and a cylinder hole 5 that communicates with the cylinder hole 5 to form a main body. The cylinder hole 5 has an inlet 6.7 and an outlet 8.9 opening on the side of the cylinder hole 5.
The lower end portion of is an exhaust port 10. The inlet 6.7 communicates with an air reservoir (not shown) and the outlet 8.9 with a brake circuit (not shown).

The main piston 1 is located in the upper large diameter hole 5A in the cylinder hole 5.
1 is slidably housed. This main piston 11 has a large diameter portion 12 in the shape of a plate that slides on the inner peripheral surface of the cylinder hole 5, and defines a pressure chamber A between it and the upper step 13 of the cylinder hole 5, and has one end in contact with the upper step 13. It is urged upward by a return spring 14.

This pressure chamber A communicates with the outlet 8 through a vertical hole 15 provided on the upper surface of the upper stage 13 near the outlet 8. The main piston 11 has a hollow shaft portion 16 extending upward from the center of the large diameter portion 12.
A cylinder block 18 having a diameter larger than that of the hollow shaft part 16 and having a threaded outer circumference is fitted concentrically into the part of the hollow shaft part 16 that projects from the upper opening of the cylinder hole 5. It is a part of the hollow shaft 16. A nut-shaped upper adjustment member 19A and a lower adjustment member 19B are screwed in series to this cylinder block 8, and these constitute a stopper that applies a preload to the main spring 20.

The main spring 20 is slidably fitted into the hollow shaft portion 16 and has a spring receiver 21 and a large diameter portion 1 that engage with the lower end surface of the lower spring member 19B.
A sub spring 22 having a smaller diameter than the main spring 20 is preloaded and interposed between the lower spring member 19B and the inner bottom surface of the large diameter portion 12, and is arranged concentrically with the main spring 20. It is also preloaded and inserted between the two.

A relay piston 23 is slidably housed in a lower large diameter hole 5C within the cylinder hole 5.

This relay piston 23 has a large diameter portion 24 in the shape of a plate that slides on the inner circumferential surface of the large diameter hole 5C, and communicates the large diameter hole 5C with the outlet 9 through the vertical hole 25, and the pressure chamber B on the lower stage 26 side. Through hole 2
A relay chamber C communicates with the bottom of the vertical hole 15 through 7, and a downward pressing force is applied by a spring 28 interposed between the upper and lower bottoms of the relay chamber C. relay piston 23
has a hollow shaft portion 29 extending upward from the center of the large diameter portion 24 and a cylindrical portion 30 projecting downward, and the hollow shaft 29 has a small diameter portion provided between the large diameter hole portions 5A and 50 of the cylinder hole 5. Hole 5B
It has a notch 29a that opens at the pressure chamber A and communicates with the inside of the pressure chamber A, extends upward through the small diameter hole 5B, and has a distal end slidably fitted into the cylindrical portion 17 of the main piston 11. It engages with the lower end of the support rod 32 via 31. This support rod 32 extends upward through the main piston 11 and is fixed to the main piston 11 by a nut 33 and a sleeve 32A screwed onto the upper end protruding from the upper surface of the cylinder block 18 of the stopper, and is fixed to the main piston 11 via the spring 31. The relay piston 23 is elastically supported.

A valve member 34 of the upper valve device is slidably fitted onto the hollow shaft portion 29 of the relay piston 23 in the small diameter hole portion 5B of the cylinder hole 5. The valve member 34 is slidably fitted into a spring receiver 36 supported by a stopper 35, and is urged upward by an upper valve spring 37 whose one end is supported by the spring receiver 36 to open the small diameter hole 5B. The main piston 11 is seated on a first upper valve seat 38 formed at the lower end of the cylindrical portion 17 of the main piston 11, and in this state faces a second upper valve seat 39 formed at the lower end of the cylindrical portion 17 of the main piston 11 so as to be seated thereon.

The upper valve member 34 and the upper first valve seat 38 are connected to the inlet 6 and the outlet 8.
a normally closed upper first valve 40 located between the
The upper valve member 34 and the upper second valve seat 39 constitute an upper second valve 41 that is located between the outlet 8 and the exhaust port 10 and is normally open. The upper valve member 34 has a rubber seat 42 on its seating surface, and also has a spring receiver 43 that comes into contact with the other end of the upper valve spring 37. 44 is a stopper provided on the upper valve member 34.

A cylindrical valve member 45 of a lower valve device is housed in a small diameter hole 5D formed below a large diameter hole 5C of the cylinder hole 5. A lid member 46 is fitted into the lower end opening of the small diameter hole 5D, and a check valve device 47 is fitted to the lower end surface.
is attached so that the cover member 46 is prevented from coming out. This lower valve member 45 fits into a lid member 46 and projects downward from the cough lid member 46, and a spring receiver 47 supported by the lid member 46
A lower first valve seat 50 is formed in the upper opening of the small diameter hole 5D and is biased upward by a lower valve spring 49 that is slidably fitted into the spring holder 47 and has one end supported by the spring receiver 47. In this state, it is seatably opposed to an upper second valve seat 51 formed at the lower end of the cylindrical portion 30 of the relay piston 23. The lower valve member 45 and the lower first valve seat 50 constitute a normally closed lower first valve 52 located between the inlet lower and the outlet 9, and the lower valve member 45 and the upper second valve seat 51 constitutes an upper second valve 53 located between the outlet 9 and the exhaust port 10 and normally open. Note that the lower valve member 45 is similar to the upper valve member 3.
4, it has a rubber sheet 54 and a spring receiver 55. Note that a stopper 56 is fitted to a portion of the lower valve member 45 that protrudes from the lid member 46.

The upper opening of the valve body 2 has a hole 60 concentric with the cylinder hole 5.
A lid member 61 having a shape is attached with bolts 62. A cup-shaped plunger 64 is slidably fitted into the hole 60 of the lid member 61 via a bush 63.
The open end side of the plunger 64 contacts the spring receiver 26, and the closed end side contacts a brake pedal 67 rotatably supported by a protrusion 65 of the lid member 61 via a pin 66.

A roller 68 that can rotate the end face of the plunger 64 is provided at a portion of the brake pedal 67 that comes into contact with the plunger 64 .

Next, the operation of this valve will be explained.

When the driver depresses the brake pedal 67, the main piston 11 descends against the return spring 14 due to the input transmitted through the plunger 64, spring receiver 21, main spring 20, and sub spring 22, and the upper second valve 41 closes and opens the first upper valve 40. As a result, compressed air is supplied from the inlet 6 to the outlet 8 through the pressure chamber A and the T-fit hole 15, and from the outlet 8 to the brake circuit through piping (not shown). The brakes of one brake system of the vehicle are activated. At the same time, compressed air flows into the relay chamber C through the through hole 27.

The compressed air that has flowed into the relay chamber C acts on the upper surface of the relay piston 23 and causes it to descend, so that the lower second valve 53
is closed, the lower first valve 52 is opened, and pressure chamber B is
Compressed air is supplied to the outlet 9 through the outlet 9, and the brakes of the other brake system are activated. Thereafter, as the pressure in each outlet 8.9 increases, the main piston 11 and the relay piston 23 move to the balanced position, and the upper first valve 40, the upper second valve 41, the lower first valve 52, and the lower All of the two valves 53 are closed, and the pressure within the outlet 8.9 is stabilized. At this time, the main spring 20. The auxiliary spring 22 is in a state in which it is further compressed by four degrees from the preloaded state when it is not activated, depending on the amount of depression (depression force) of the brake pedal 67.

When the driver further depresses the brake pedal, the main spring 20 and the sub spring 22 are further compressed, the upper first valve 40 opens, and the pressure inside the outlet 8 further increases, and accordingly, the relay chamber C
Since the pressure inside also increases, the relay piston 23 descends to open the lower first valve 52, and the pressure inside the outlet 9 increases. Thereafter, when the vertical pressures acting on the main piston 11 and the relay piston 23 are balanced, the first upper valve 40 and the first lower valve 52 are closed, and the pressure inside the outlet 8.9 becomes stable again.

After this, when the brake pedal 67 is further depressed,
The spring receiver 14 comes into contact with the upper surface of the large diameter portion 12 of the main piston 11, and the main piston 11 cannot move upward, and the first upper valve 40 is held open and the highest pressure in the air storage tank reaches the outlet 8.
．． 9 will be supplied.

When the brake pedal 67 is released, the upper first valve 40,
Since the first lower valve 52 is closed and the second upper valve 41 and the second lower valve 53 are opened, the pressure chambers A and B and the inlet 6.7 are respectively cut off, and the pressure chamber ASB and the exhaust Mouth 10
As a result, the compressed air supplied to the brake circuit is released to the atmosphere from the exhaust port 10 through the outlet 8.9 and the pressure chamber ASB.

Next, adjustment of the preload (set load) will be explained.

Now, suppose that the state shown in the figure, that is, the state in which the spring receiver 14 is engaged with both the lower surface of the cylindrical block 18 and the lower surface of the lower spring member 19B, is the state before the set load is adjusted, and the main spring 20 If the set load is insufficient, if the lower screw member 19B is turned clockwise and screwed downward, the height of the engagement position between the lower screw member 19B and the spring receiver 14 will be lowered. As a result, the main spring 20 is further compressed, and the set load increases. After adjusting the engagement position by a predetermined height, the upper threaded member 19A for rotation prevention is rotated in the same direction to complete the adjustment work. If too much set load is applied due to preload adjustment, the operation in reverse to the above may be performed.

In this way, in this embodiment, the set load of the spring can be adjusted simply by rotating the lower screw member 19B, and this rotation operation can also be performed from the hole 60 of the cover member 61. Compared to the conventional case where multiple members had to be removed to allow the shim to be inserted under the stopper, the spring set load adjustment work is significantly simpler and the burden on the adjustment worker is reduced. is significantly reduced.

〔Effect of the invention〕

As explained above, the present invention uses a screw member that is screwed into the movable body as the stopper that engages with the spring receiver of the elastic device and applies a set load to the spring, so that the screw member can be simply rotated. Since the set load can be adjusted by operation, the conventionally troublesome and time-consuming set load adjustment work can be easily completed in a short time, and the practical effect is extremely large.

[Brief explanation of drawings]

The figure is a longitudinal sectional view showing an embodiment of the present invention. 6.7-Population, 8.9-Exit, 10-Exhaust port, 40
．． 41.52.53-Valve, 11--Raw piston, 23-
・Relay piston, 14-・Spring receiver, 20.22--
- Spring, 18--Cylinder block, L 9 A-- Upper threaded member, 19B-- Lower threaded member, 67-- Brake pedal, A, B- Pressure chamber.

Claims (1)

[Claims] An inlet connected to an air storage tank, an outlet connected to a brake circuit, a valve device provided in a passage connecting the inlet and the outlet, and the valve devices are movably arranged opposite to each other so as to be openable and closable. a movable body, a pressure chamber formed on the valve device side of the movable body and causing the movable body to receive the outlet side pressure in a direction to close the valve device, and a side of the movable body opposite to the valve device side. an elastic device installed in the brake pedal for transmitting an input from the brake pedal to the movable body, the elastic device including a spring receiver that receives the input from the brake pedal, and a tension device between the spring receiver and the movable body. In the brake valve, the brake valve includes a spring provided and a stopper that engages with the spring receiver and applies a preload to the spring, the stopper being able to change the engagement position of the stopper with the spring receiver in the axial direction on the movable body. A brake valve formed by a threaded member.