JPS63231023A - Pneumatic pressure control valve for air clutch - Google Patents

Abstract

PURPOSE:To make clutch operation to be performed easily by reducing energizing force transmitted to the second valve body through treading down operation on a clutch pedal for reducing pneumatic pressure toward a pneumatic clutch successively. CONSTITUTION:The first spring 86, the second spring 89 and the third spring 88, whose spring constants are set in such wise that they get weaker by turns, are made to be changed over in accordance to treading down stroke of a clutch pedal 69. While,the maximam pneumatic pressure is lowered through lowering the spring load of the first spring 86. Therefore, in the stroke of the clutch pedal 69, the device exhibits linearly increasing character of leg-power according to increase of stroke. Therefore, a driver can have natural clutch operation feeling of leg-power becoming heavier in proportion as treading down stroke on the clutch pedal 69 increases, so clutch operation becomes easy.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air pressure control valve for an air clutch that controls air pressure supplied to the air clutch.

(Prior art and its problems) This type of air clutch is constructed as shown in FIG.

In FIG. 4 showing an air clutch for an automobile, which is a type of pneumatic equipment, 10 is a flywheel on the L engine side. This flywheel 10 has a clutch cover 12
is fixed, and the pressure force generated by the annular pneumatic actuator 14 (pneumatic device) of the clutch cover 12 is transmitted to the pressure plate 16 to sandwich the clutch disc 18 between the pressure plate 16 and the flywheel 10. It looks like this.

The clutch disc 18 is spline-fitted to an input shaft 20 of a speed change IN (not shown) arranged after the air clutch. An n@24 is fitted to the outer side of the input shaft 20 via a bushing 22. The clutch cover 12 is fitted to the right end of the sleeve 240 in the drawing.

The left end portion of the cylinder shaft 24 is surrounded by a cover 26, and a chamber 28 is formed inside the cover 26.

There are two air seals 308 between the cover 26 and the cylinder shaft 24.
- 30b are interposed 4A, and air leakage is prevented by air seals 30a - 30b, which will be described in detail later.

On the other hand, a control valve 32 operated by a clutch pedal 31 is connected to the cover 26, and the compressed air flowing from the compressor 34 via the pressure regulating valve 36 is controlled by the control valve 32 (inching valve) between the air seal 30a and the air seal 30b.
The passage 42 flows from the inlet hole 40 of the cylindrical shaft 24 through a total of 38 in between. Further, an outlet hole 44 is connected to the left end of the passage 42, and the outlet hole 44 is connected to an air chamber 48 of the pneumatic actuator 14 through a passage 46 formed within the thickness of the clutch cover 12. .

In such a conventional example, the control valve 32 is connected to the clutch pedal 31 by a rod, and the clutch cannot normally be operated by hydraulic pressure from the clutch master cylinder.

Further, a pressure control valve can be used as the ll11ll valve 32, but in this case, the normal pedal operation feeling in which the pedal depression force gradually increases as the amount of depression of the clutch pedal 31 increases cannot be obtained, and the clutch Operation becomes difficult.

(Purpose of the Invention) The present invention is capable of applying air pressure to an air clutch using hydraulic pressure from a clutch master cylinder, making clutch operation easy, and having a short axial length that makes it easy to install on an actual vehicle. The purpose is to provide a control valve.

(Structure of the Invention) (1) Technical Means The present invention has an air valve body that supplies air pressure from an air pressure source to an air clutch while adjusting the pressure in conjunction with the amount of depression of the clutch pedal. The air clutch includes a first valve body that supplies air pressure to the air clutch when the clutch is connected, and a second valve body that is interlocked with the clutch pedal and releases the air pressure supplied to the air clutch when the clutch is disengaged, in the air valve body. In this pneumatic control valve, a piston is slidably provided in a cylindrical cylinder fixed to one end surface of the air valve body, and a hydraulic chamber is formed between the piston and the cylinder, which is connected to a clutch master cylinder that is linked to a clutch pedal. , a rod passing through the air valve body is held in the piston, a cylindrical body is fixed to the other end surface of the air valve body, a first balance piston is slidably provided in the cylindrical body, and the first balance piston・A second valve body is provided on one end surface to be in close contact with the first valve body, a cylindrical projection is formed on the other end surface of the first balance piston, and a second balance piston is formed into a cylindrical body at the end of this cylindrical projection. an air chamber is formed between the second balance piston and the end cover of the cylindrical body, an air passage is provided in the air chamber for guiding compressed air pressure to be supplied to the air clutch, and Forming a long hole with a predetermined length in the protrusion,
a first spring member that fits a pin fixed to an end of the rod into the elongated hole and generates a spring force between the cylindrical body and the rod to resist hydraulic pressure from the hydraulic chamber; and a second valve. second and third spring members are provided for setting the valve opening pressure of the body;
operating the third spring member in series while concentrically disposing the third spring member;
A spring force transmission mechanism is provided to transmit the spring force of the second and third spring members to the second valve body, and the position of the piston, which slides with hydraulic pressure from the clutch master cylinder linked to the clutch pedal, is adjusted to suit clutch control. This is a 1-ac-clutch pneumatic control valve which is characterized in that it obtains suitable air pressure characteristics.

(2) As the hydraulic pressure acting on the piston increases when the clutch pedal is depressed, the biasing force transmitted from the separate spring force transmission tank to the second valve body via the first balance piston becomes weaker, and the force applied to the air clutch becomes weaker. Obtain an air pressure characteristic in which the air pressure gradually decreases.

Since the spring force transmission mechanism has the first, second, and third spring members arranged concentrically, the length in the axial direction is shortened, the overall quality of the pneumatic control valve is short, and it is easy to mount it on an actual vehicle.

(Example) In FIG. 1 showing a pneumatic control valve adopting the present invention,
Parts marked with the same symbols as in FIG. 4 indicate the same or equivalent parts.

In FIG. 1, the air pressure control valve (inching valve) is composed of an air valve body 54 in the center, a control mechanism 56 on the right side, and a hydraulic mechanism 57 on the left side, and is supplied from a passage 55 of the air valve body 54. The compressed air is passed through the passage 55a.
Air pressure is controlled and supplied from the air clutch to the air clutch.

A passage 53 is connected to the passage 55a, and a compressor 34 and an air tank 35 are interposed in the passage 53.

First, the air valve main body 54 includes a body 58 and a first valve body 59.
, compression coil spring 60. It is formed from a valve guide 61 and the like. A continuous valve seat 58a is formed on the inner circumferential surface of the substantially cylindrical body 58, and a pressure contact surface 59a of the first valve body 59 is pressed against and separated from the valve seat 58a to establish a closed or open state. It is designed to be switched.

The approximately cylindrical valve guide 61 has a snap ring 6
1a is prevented from being removed by the body 58, and a first valve body 59 is slidably provided on the outer circumferential surface of the valve guide 61 with a seal ring 59b in between while maintaining airtightness. 1st
A compression coil spring 60 is interposed between the valve body 59 and the valve guide 61.
The pressure contact surface 59a is pressed against the valve seat 58a by the spring force.

Further, a second valve body 63 of a first balance piston 62, which will be described in detail later, is in pressure contact with the inner circumference of the right end surface of the pressure contact surface 59a, and the second valve body 63 urges the pressure contact surface 59a in the direction of arrow A. It has a structure that allows Therefore, the second valve body 63
When the compressed air is separated from the air clutch 9a, a portion of the compressed air supplied to the air clutch from the passage 55a is discharged to the passage 64. The compressed air discharged into the passage 64 is passed through the hole 6 of the tip control device M456.
5, it flows in the direction of arrow C and is released to the atmosphere.

Next, the hydraulic mechanism 57 includes a hydraulic chamber 68 formed between a cylinder 66 and a piston 67 fixed to the left end surface of the body 58 in the drawing. This hydraulic chamber 68 is connected through a pipe 68a to a master cylinder 70 that converts the amount of depression of the C clutch pedal 69 into hydraulic pressure. 67 slides in the direction of the reverse arrow. 68b
is an air vent, and 67a is a seal.

A rod 71 is held concentrically at the center of the right end of the piston 67, and the rod 71 passes through the center of the valve guide 61 and extends toward the control mechanism 56. A mechanism 56 and a hydraulic machine m57 are connected.

A cylindrical body 72 of the control mechanism 56 is fixed to the right end surface of the body 58, and the right end surface of the cylindrical body 72 is connected to the end lid 73.
-Q i! It's sealed. Sliding surfaces 74 and 75 are formed at both left and right ends of the inner peripheral surface of the cylindrical body 72, and the first balance piston 62 slides on the left sliding surface 74 via a seal ring 62a. It is set freely. The left end surface of the first balance piston 62 has the second
The valve body 63 is formed continuously. Similarly, a cylindrical projection 76 extends continuously to the right on the right end surface of the first balance piston 62, and a long hole 77 is formed in the middle of the cylindrical projection 76 over a predetermined length. It opens in the direction.

A second balance piston 78 is fixed to the right end surface of the cylindrical projection 76 with a bolt 79.
8 is slidably fitted to the sliding surface 75 via a seal ring 78a. An air chamber 80 between the second balance piston 78 and the end cover 73 communicates with the passage 55a through a passage 81 formed within the thickness of the cylindrical body 72.

A pin 82 is fixed to the right end of the rod 71 so as to pass through the rod 71 in eleven directions, and the pin 82 passes through the elongated hole 77 . Also, a hole 83 is provided at the right end of the rod 71.
, a passage 84 is formed, and the passage 64 and the chamber 85 communicate with each other through the elongated hole 77, the hole 83, and the passage 84.

A first spring 86 is provided on the inner peripheral surface of the right end of the cylindrical body 72.
The right end surface of the first spring member (first spring member) is in pressure contact with J3, and the left end surface of the first spring 86 is in pressure contact with the flange portion 87a of the spring receiver 87. The flange portion 87b of the spring receiver 87, which has a substantially cylindrical shape, is in pressure contact with the pin 82, and is adapted to transmit the spring force of the first spring 86 acting in the direction of the arrow to the rod 71 via the spring receiver 87. .

Furthermore, inside the first spring 86 is a third spring 8.
8 (third spring member) and a second spring 89 (second spring member). The right end surface of the second spring 89 is in pressure contact with the spring receiver 82a of the pin 82, and the left end surface of the second spring 89 is in pressure contact with the flange portion 90a of the spring receiver 90.

The flange portion 90b of the spring receiver 90 having a substantially cylindrical shape has a third
The right end surface of the spring 88 is in pressure contact, and the left end surface of the third spring 88 is in pressure contact with the end surface 91 of the first balance piston 62.
is in pressure contact with.

The spring constant of the first spring 86 is such that the spring load is set so as to resist the hydraulic pressure of the hydraulic chamber 68 and define the maximum air pressure when the clutch is connected, at which no hydraulic pressure acts on the first valve body 59. The second spring 89 has a spring load set to a medium strength, and the third spring 88 has a spring load set to the weakest.

Therefore, the spring force transmission mechanism 9 with the spring receiver 87.90
2 is constructed, and a third
The spring 88 and the second spring 89 are held concentrically and their spring forces are operated in series.

Next, the effect will be explained. In the clutch connected state shown in FIG. 1, the clutch pedal 69 is naturally not depressed, and the hydraulic chamber 69
8 has no hydraulic pressure. Therefore, the piston 67 is sliding farthest to the right.

In this state, the third spring 88 and the second spring 8
The spring force of the first spring 86 is canceled out by the spring force of the first spring 86, and the rod 71 is pushed in the direction of the arrow A by the spring force of the first spring 86 transmitted to the pin 82 via the spring receiver 87.

At the same time, the spring force of the first spring 86 is transmitted to the first balance piston 62 through the second spring 89, the spring receiver 90, and the third spring 88, and the second valve body 63
9a in the direction of arrow A, that is, in the valve opening direction, and press the pressure contact surface 59.
a is away from the valve seat 58a, and the compressed air supplied to the passage 55 flows into the passage 55a.

When the pressure in the chamber 93 connected to the passage 55a becomes too high, the pressure in the chamber 93 pushes in the reverse direction A, causing the second valve body 63 to separate from the pressure contact surface 59a, and part of the compressed air in the chamber 93 to be released. teeth,
It passes through the passage 64, the hole 83, the passage 84, and the elongated hole 77.185, and is discharged into the atmosphere from the hole 65 in the direction of arrow C. In this way, the pressure of the compressed air flowing from the passage 55a to the air clutch is regulated.

Due to the pressure regulating action of the passage 84 when the clutch is connected, the maximum air pressure P1 is determined by the characteristic X in FIG. is set. Therefore, there is no need to provide a pressure regulating valve V in the middle of the passage 53 as in the conventional case.

When the clutch pedal 69 is depressed by the clutch disconnection operation, the oil pressure in the hydraulic chamber 68 gradually increases, and the piston 6
Push 7 in the opposite direction of A. When the hydraulic saw in the hydraulic chamber 68 is transmitted to the spring receiver 87 via the rod 71 and the pin 82, overcoming the spring force of the first spring 86 and sliding the piston 67 to the right, the spring of the first spring 86 Power is from hydraulic chamber 6
8, the spring force of the second spring 89 pushes the first balance piston 62 in the direction of the arrow, and the second balance piston 62 is pushed in the direction of the arrow.
The valve body 63 is pressed against the pressure contact surface 59a.

In this operating state of the second spring 89, a relatively steep characteristic x1 occurs in the characteristic X shown in FIG. 2 in the range from 81 to s2.

When the clutch pedal 69 is further depressed, the oil pressure in the hydraulic chamber 68 further increases, and the amount of rightward sliding of the piston 67 also increases, until the second spring 89 is fully extended, and then the third spring 88 The second valve body 63 of the first balance piston 62 is pressed against the pressure contact surface 59a by the force. In this state, the characteristic is gentle in the range of 82 to S3 in Fig.
2 occurs. In addition, when the clutch pedal 69 is depressed up to this $3 level, the piston 67 slides to the farthest right, and the air clutch is disengaged.

As described above, when the clutch pedal 69 is depressed, the effective area of the first balance piston 62 is
．． The effective area of the second balance piston 78 is B111,9
93 pressure is Pa, and the spring force of the first spring 86 is Wl.
, the spring force of the second spring 89 is W2, the spring force of the third spring 88 is W3, the pressure of the hydraulic chamber 68 is P, and the effective area of the piston 67 is A, and the spring forces W2 and W3 are combined in series. Therefore, if the higher load of spring forces W2 and W3 is Wx, then PXA-Wl -Wx Wx = Pa (Am-B+) PxA = W1-Pa (Am - Bm) Wl =
(PXA)+Pa (Am-Bit)wl-(P
XA)+WX, the first balance piston 62 is balanced, and the second
The pressure contact surface 59a is closed and closed by the valve body 63, and the pressure is balanced at a pressure commensurate with the operating position of the clutch pedal 69, that is, the depressed position.

As described above, the first spring 86, second spring 89, and third spring 88, whose spring constants are set to become weaker sequentially, are switched according to the amount of depression of the clutch pedal 69, so that the air clutch On the contrary, when the so-called clutch engages to connect from the disengaged state, as shown in Fig. 2, in the range of 82 to S3 where the stroke S is large, P is gently raised by characteristic x 2, and the first
After passing through the region Y where both the spring 86 and the second spring 89 are activated, the air pressure P rises rapidly with characteristic x1, and the air clutch is completely connected at the maximum air pressure P1.

Therefore, it is possible to prevent the problem that the air clutch suddenly becomes disconnected due to a slight stroke S of the latch pedal 69, which is common in conventional air clutches using pressure control valves.

In addition, by lowering the spring load of the first spring 86, the maximum air pressure P1 is lowered to P2, and by adjusting the spring loads of the second and third springs 89, 88, etc., the characteristics 3 to x6 are obtained.

Furthermore, the depression force of the clutch pedal 69 is increased by the first spring 86.
The stroke S of the clutch pedal 69 due to the spring force of
As shown in FIG. 3, which is a graph of p-depression force T, as the stroke S increases, the driver exhibits a characteristic Z that increases gradually as the stroke S increases. The claps will have a natural feeling of being heavier.

(Effects of the Invention) As explained above, in the air clutch pneumatic control valve according to the present invention, the piston 67 is slidably installed in the cylinder 66 fixed to one end surface of the air valve body 54. A hydraulic chamber 68 connected to a clutch master cylinder 70 which is interlocked with a clutch pedal 69 is formed between the cylinder 66 and the piston 67, and a rod 71 passing through the air valve body 54 is held in the piston 67. A cylindrical body 72 is fixed to the other end surface, a first balance screw 1-62 is slidably installed in the cylindrical body 72, and a first valve body 59 is attached to one end surface of the first balance piston 62. A second valve body 63 is provided in close contact with the first balance piston 62, a cylindrical projection 76 is formed on the other end surface of the first balance piston 62, and a second balance piston 78 is movable in the cylindrical body 72 at the end of the cylindrical projection 76. An air chamber 8 is provided between the second balance piston 78 and the end cover 73 of the eleven-shaped body 72.
0, an air passage 81 for guiding compressed air pressure to be supplied to the air clutch is provided in the air "8!80, a long hole 77 with a predetermined length is formed in the cylindrical protrusion 76, and the rod 71 a first spring 86 that fits into the elongated hole 77 with a pin 82 fixed to the end thereof, and generates a spring force between the cylindrical body 72 and the rod 71 against the hydraulic pressure from the hydraulic chamber 68; The second and third valves set the valve opening pressure of the second valve body 63.
Eight springs 88 are installed and the first, second, and third springs 86, 89, and 88 are arranged concentrically and actuated in series, and the spring force of the second and third springs 89.8B is applied to the A spring force transmission mechanism 92 is provided to transmit the force to the second valve body 63, and air pressure characteristics suitable for clutch control are obtained by adjusting the position of the piston 67, which moves hydraulic pressure from the clutch master cylinder 70 in conjunction with the clutch pedal 69. By doing so, the following effects are achieved.

Unlike the conventional method, the clutch pedal 69 and the pneumatic control valve are not connected by a rod, and the present invention can be applied to a vehicle having six ordinary master cylinders 70 as is. Moreover, the third spring 88 and the second spring 89 are concentrically stacked in double layers, so that the length of the retainer 6 can be shortened compared to the conventional one, and the entire air pressure frill t111 valve length can be shortened by that much. This allows for easy installation of pneumatic control valves into actual vehicles.

When the clutch is engaged, as shown in Fig. 2, in the range of 82 to S3 where the stroke opening S is large, P is gradually increased by characteristic x 2, and the second spring 8 is 86 in the vicinity of S2.
It is possible to obtain a characteristic X in which the air L[P suddenly increases with characteristic x 1 after passing through a region Y where both of the two actuate, and the air clutch is completely engaged at the maximum air pressure P1. Therefore, it is possible to prevent the problem of the air clutch suddenly becoming intermittent due to a slight stroke of the latch pedal 69, which tends to occur in air clutches using conventional pressure control valves, and the clutch operation can be made easier. Become.

Further, the depression force of the clutch pedal 69 is determined by the first spring 86.
The stroke S of the clutch pedal 69 is caused by the spring h of
As shown in FIG. 3, which is a graph of the o-depression force T, as the stroke S increases, it exhibits a characteristic Z that increases to 2V, so as the amount of depression of the clutch pedal 69 increases, the depression force T becomes heavier. This provides the driver with a natural clutch operation feeling.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing a pneumatic control valve adopting the present invention, Fig. 2 is a graph showing air pressure characteristics, Fig. 3 is a graph showing pedal depression force characteristics, and Fig. 4 does not show a conventional example. This is a schematic diagram of Kanzo. 54...Air valve body, 56...Control mechanism, 57...il+pressure machine groove mechanism 2...First balance piston, 67...Piston, 68...Hydraulic chamber, 7
DESCRIPTION OF SYMBOLS 1... Rod, 73... End cover, 76... Cylindrical projection, 77... Long hole, 86... First spring, 88
...Third spring, 89...Second spring, 9
2...Spring force transmission mechanism

Claims (2)

[Claims] (1) The first valve has an air valve body that supplies the air pressure from the air pressure source to the air clutch while adjusting the pressure in conjunction with the amount of depression of the clutch pedal, and supplies the air pressure from the air pressure source to the air clutch when the clutch is connected. and a second valve body which releases the air pressure supplied to the air clutch when the clutch is disengaged in conjunction with the clutch pedal, on one end surface of the air valve body in the air pressure control valve of the air clutch provided in the air valve body. A piston is slidably provided in a fixed cylindrical cylinder, a hydraulic chamber is formed between the piston and the cylinder, and is connected to a clutch master cylinder that is linked to a clutch pedal, and the piston holds a rod that passes through the air valve body. A cylindrical body is fixed to the other end surface of the air valve main body, a first balance piston is slidably provided within the cylindrical body, and a second balance piston is provided on one end surface of the first balance piston in close contact with the first valve body. Provide a valve body,
A cylindrical projection is formed on the other end surface of the first balance piston, a second balance piston is provided at the end of the cylindrical projection so as to be slidable on the cylindrical body, and an end cover of the second balance piston and the cylindrical body is formed. an air chamber is formed between the air chamber and an air passage for guiding the compressed air pressure supplied to the air clutch, an elongated hole of a predetermined length is formed in the cylindrical protrusion, and A pin fixed to the part is fitted into the elongated hole, and a first spring member that generates a spring force between the cylindrical body and the rod to resist the hydraulic pressure from the hydraulic chamber, and a second valve body are opened. second and third spring members for setting the pressure are provided, the first, second and third spring members are arranged concentrically and actuated in series;
A spring force transmission mechanism is provided to transmit the spring force of the third spring member to the second valve body, and the air pressure suitable for clutch control is determined by the position of the piston that slides with hydraulic pressure from a clutch master cylinder linked to a clutch pedal. A pneumatic control valve for an air clutch, characterized in that it has certain characteristics. (2) The spring force transmission mechanism includes a first guide that connects one end surface of the first spring member to the pin, and a second guide, and the second guide is disposed at the innermost periphery and press-fits one end surface to the pin. The other end surface of the second spring member is connected to the other end surface of the second spring member, which is disposed on the outer periphery of the second spring member and has one end surface pressed against the first balance piston. Air clutch pneumatic control valve.