JPH06117532A - Controller for transmission operation actuator - Google Patents

Abstract

PURPOSE:To simplify a pressure feed passage between an actuator and a pressure source and provide high responsiveness by providing a changeover valve between the pressure chamber of the actuator for transmission operation and the pressure source, operating the valve lifter of this changeover valve by means of two solenoid valves. CONSTITUTION:In the case of this controller 30 to conduct the drive control of an actuator 71 for transmission operation, it is provided with a valve body 33 to close a space between both ports 48, 49 under energization by means of a spring 38, between the inlet port 48 connected to a pressure source 70 and the outlet port 49 connected to the actuator 71. Also, it is provided with a valve lifter 34 that connects the actuator 71 to atmosphere in a non-operation state and cuts off connection between the actuator 71 and atmosphere at the time of operation and opens the valve body 33. This valve lifter 34 is operated by means of fluid pressure in a pilot passage 52 connected to the pressure source 70, and this fluid pressure is controlled by means of two solenoid closing valves 41, 41' to be opened by means of magnetization.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a transmission operating actuator. More specifically, the present invention relates to a control device for a transmission operating actuator. The present invention relates to a control device for a transmission operating actuator that supplies or discharges fluid from the transmission operating actuator.

[0002]

2. Description of the Related Art FIG. 3 conceptually shows a general transmission operating device used in a large vehicle. In this transmission operating device, a shift operating actuator 1 and a select operating actuator 2 are used. Both actuators 1 and 2 include a piston 1b and 2b integrally formed with a piston rod 1a and 2a, and a free piston 1
c and 2c, three pressure chambers 1d and 1
e, 1f, 2d, 2e, 2f are defined, and compressed air is supplied to or discharged from the pressure chambers to operate the transmission.

Such control of compressed air is performed by each pressure chamber 1
This is performed by electromagnetic switching valves 3, 4, 5, 6, 7, 8 connected to d, 1e, 1f, 2d, 2e, 2f. For example, in order to operate the actuators 1 and 2 in the neutral position N2 in FIG. 3 to the first speed position F1, the electromagnetic switching valve 6 is excited to supply compressed air to the chamber 2d of the select operation actuator 2, Further, the electromagnetic switching valve 4 is excited to move the compressed air into the pressure chamber 1e of the shift operation actuator 1.
Supply to. Further, in order to operate each of the actuators 1 and 2 in the neutral position N2 in FIG. 3 to the reverse position R1, the electromagnetic switching valve 6 is excited to supply compressed air to the chamber 2d of the select operation actuator 2, and the electromagnetic operation is further performed. The switching valve 3 is excited to supply compressed air to the pressure chamber 1d of the shift operation actuator 1.

By the way, in such a control device for a transmission operating actuator, a failure occurs in the electromagnetic switching valve,
If the electromagnetic switching valve becomes inoperable, the vehicle cannot be moved.

Therefore, in such a control device for a transmission operating actuator, the electromagnetic switching valves 3, 4, 5, 6,
7 and 8 are dual-type electromagnetic switching valves, and when one switching valve fails, the other switching valve is operated to operate the shift operation actuator 1 and the select operation actuator 2, thereby operating the vehicle. I am trying to move it.

As a dual type electromagnetic switching valve used in the above-mentioned conventional control device, there is one in which the direct acting electromagnetic switching valves 10 and 20 shown in FIG. 4 are connected. In such an electromagnetic switching valve, the valve bodies 11 and 21 of the two electromagnetic switching valves 10 and 20 are interposed in the passages connecting the inlet ports A and A ′, the outlet port B and the exhaust port C, respectively, and the spring 12 and The valve elements 11 and 21 are brought into contact with the valve seats 13 and 23 by the urging force of the valve 22, and the inlet ports A and A'and the outlet port B are closed, and the valve elements 11 and 21 are seated. 14,
It is separated from 24 to open between the outlet port B and the exhaust port C.

When one of the electromagnetic switching valves 10 is excited, the valve body 11 is moved against the urging force of the spring 12, separated from the valve seat 13, and abuts on the valve seat 14. Therefore, the compressed air in the air tank D passes from the inlet port A through the passage 10a, between the valve body 11 and the valve seat 13, and passes through the passages 10b, E, 20c, 20d, 20e, 20.
Outlet port B through actuator b to actuator F
Is supplied to. When the electromagnetic switching valve 10 is demagnetized, the valve body 11 returns to the state shown in FIG. 4, so that the compressed air of the actuator F is discharged from the outlet port B,
Passages 20b, 220e, 20d, 20c, E, 10b,
After passing through 10e, 10d, and 10c, the gas is exhausted to the outside through the exhaust port C.

When the other electromagnetic switching valve 20 is excited, the valve body 21 is moved against the urging force of the spring 22 to separate from the valve seat 23 and come into contact with the valve seat 24. Therefore, the compressed air in the air tank D is
′ Through the passage 20a, between the valve body 21 and the valve seat 23, and through the passage 20b from the outlet port B to the actuator F. Then, the electromagnetic switching valve 20
Is demagnetized, the valve body 21 returns to the state shown in FIG. 4, so that the compressed air of the actuator F is discharged from the outlet port B, the passages 20b, 20e, 20d, 20c, and 20c.
After passing through E, 10b, 10e, 10d and 10c, the gas is exhausted to the outside through the exhaust port C.

[0009]

By the way, in a dual type solenoid operated directional control valve using such a direct acting type solenoid operated directional control valve, the passage is complicated and it is difficult to supply a large amount of compressed air in a short time. . That is, it is difficult to improve the responsiveness of the shift operation actuator 1 and the select operation actuator 2 in the dual type electromagnetic switching valve as described above.

SUMMARY OF THE INVENTION An object of the present invention is to provide a control device for a transmission operating actuator, which can improve the responsiveness of the shift operating actuator and the select operating actuator.

[0011]

In a control device for a transmission operating actuator according to the present invention, a spring is disposed between an inlet port connected to a pressure source and an outlet port connected to a transmission operating actuator. A valve element that is urged by the valve to close between the ports and a spring that is urged by the spring to communicate the transmission operating actuator with the atmosphere in a non-operating state, and is activated to communicate the transmission operating actuator with the atmosphere. And a valve lifter that opens the valve body and a pilot passage that is connected to a pressure source and that operates the valve lifter by the fluid of the pressure source; and a pilot passage that is interposed in parallel with the pilot passage and is in a non-excited state. And two electromagnetic shut-off valves that are respectively closed and are excited to open the pilot passages. .

[0012]

In the control device for the transmission operating actuator according to the present invention, since the solenoid valve is not directly interposed in the passage connecting the inlet port and the outlet port, the compressed air supply passage is simple.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a control device for a transmission operating actuator according to the present invention. In this control device 30, a cylinder hole 32 is formed in the center of the housing 31. A valve body 33, a valve lifter 34, and an auxiliary piston 35 are arranged in this cylinder hole 32 in this order, and retainers 36 and 37 are arranged at both ends of the cylinder hole 32.

The valve body 33 is urged by a spring 38 arranged between the valve body 33 and the retainer 36, and abuts against a valve seat 39 formed in the cylinder hole 32 of the housing 31, so that the cylinder hole 32. Input chamber 32a and output chamber 32b
Is defined in.

The valve lifter 34 defines the cylinder hole 32 into an output chamber 32b and a first pressure chamber 32c. The valve lifter 34 has an exhaust passage 34a at its axis. Further, the valve lifter 34 includes a spring 40
It is urged by the valve body 33 to be separated from the valve element 33, abuts on the auxiliary piston 35, and is stopped there.

The auxiliary piston 35 and the retainer 37 define a second pressure chamber 32d. The auxiliary piston 35 is formed with a passage 35a that opens to the peripheral surface. The passage 35a is also open to the first pressure chamber 32c.

The retainer 37 has a passage 37a opening at both end faces thereof and a passage 37b opening at an outer end face thereof.

On the other hand, a housing 43 for holding the solenoid 42 of the electromagnetic shutoff valve 41 is arranged at the end of the housing 31 on the retainer 37 side. A chamber 32e is defined on the outer end surface of the retainer 37. The plunger of the solenoid 42 corresponds to the cylinder hole 3 of the housing 31.
It is arranged on the extension of 2. The plunger is the valve body 44.
And sheets 44a and 44b are arranged at both ends. The seat 44a of the valve element 44 is arranged facing the chamber 32e and faces the opening of the passage 37b. Further, the valve element 44 has a core 45 arranged in series with the valve element 44. This core 45 is the valve body 4
A chamber 46 is defined between the chamber 4 and the chamber 4. Also, this core 45
Has an exhaust passage 45a opening at both end surfaces thereof. The seat 44b of the valve element 44 is disposed so as to face the chamber 46 and faces the opening of the exhaust passage 45a. The valve element 44 is urged by a spring 47 to bring the seat 44a into contact with the opening of the passage 37b of the retainer 37 to close the opening and to open the opening of the exhaust passage 45a of the core 45.

Further, in this control device 30, an electromagnetic shutoff valve 41 'having the same structure as the electromagnetic shutoff valve 41 is provided. The retainer 37 'of the electromagnetic shutoff valve 41' has a hole 3 formed in the housing 31 in parallel with the cylinder hole 32.
It is attached to 2 '. On the other hand, the housing 43 is provided with a solenoid 42 'of the electromagnetic shutoff valve 41'.
A chamber 32'e is defined on the outer end surface of the retainer 37 '. The plunger of the solenoid 42 'is arranged on the extension of the cylinder hole 32' of the housing 31. The plunger constitutes a valve body 44 ', and seats 44'a and 44'b are arranged at both ends thereof. The seat 44'a of the valve body 44 'is arranged facing the chamber 32'e and faces the opening of the passage 37'b. Further, the valve element 44 'has a core 45' arranged in series with the valve element 44 '. This core 45 'is the valve body 4
A chamber 46 'is defined between it and 4'. The core 45 'also has an exhaust passage 45'a open at both end surfaces thereof. The seat 44'b of the valve element 44 'is arranged so as to face the chamber 46' and faces the opening of the exhaust passage 45'a. The valve element 44 'is biased by a spring 47' to bring the seat 44'a into contact with the opening of the passage 37'b of the retainer 37 'to close the opening and the exhaust passage 45 of the core 45'. The opening of'a 'is opened. The hole 32 'is communicated with the passage 35a of the auxiliary piston 35 by 32f.

In the control device for the transmission operating actuator, the input chamber 32a and the air tank 70 are communicated with each other through the inlet port 48, and the output chamber 32b and the transmission operating actuator 71 are connected through the outlet port 49. It communicates with the pressure chamber 71a. Also,
Exhaust passage 34 of valve lifter 34 through exhaust passage 50
a is open to the atmosphere. Also, the retainers 37, 3
The 7'passages 37b, 37'b communicate with the inlet port 48 via a pilot passage 52. Further, the chambers 32e and 32'e are provided with the chambers 46 and 4 via slits 53 and 53 'formed around the valve bodies 44 and 44'.
It is connected to 6 '.

In this control device for the transmission operating actuator, the seats 44a, 44'a of the valve bodies 44, 44 'are connected to the passages 37b, while the solenoids 42, 42' are not excited.
37'b is closed, and the seats 44b, 44'b open the exhaust passages 45a, 45'a. Therefore, the second pressure chamber 32d is opened to the atmosphere through the passage 37a, the chamber 32e, the slit 53, and the exhaust passage 45a, and the first pressure chamber 32c is provided in the passages 35a, 32f, 37'a, and 32 '. e, the slit 35 ', and the exhaust passage 45'a are open to the atmosphere. In such a state, the valve lifter 34 is pushed down in FIG. 1 by the urging force of the spring 40, and the tip of the valve lifter 34 is moved to the valve body 33.
Has been separated from. Therefore, the pressure chamber 71a of the transmission operating actuator 71 is not connected to the outlet port 4
The air is exposed to the atmosphere through the 9, output chamber 32b, exhaust passage 34a, and exhaust passage 50.

When the solenoid 42 of the electromagnetic shutoff valve 41 is excited, the valve element 44 moves downward in FIG. 1, the seat 44a separates from the retainer 37, and the seat 44b abuts the core 45. Therefore, the compressed air in the air tank 70 is supplied to the inlet port 48, the passage 52,
It is supplied to the chamber 32e through the passage 37b and further supplied to the second pressure chamber 32d through the passage 37a. Therefore,
The valve lifter 34, together with the auxiliary piston 35, is pushed up in FIG.
3 is separated from the valve seat 39. Then, the air tank 70
Of the compressed air is supplied from the input chamber 32a to the output chamber 32b, is further pressure-fed to the pressure chamber 71a of the transmission operating actuator 71 through the outlet port 49, and operates the transmission operating actuator 71.

When the solenoid 42 of the electromagnetic shutoff valve 41 is demagnetized, the spring 47 returns the valve element 44 to the position shown in FIG. 1, and the exhaust passage 45a is opened. Therefore, the compressed air in the pressure chamber 32d is discharged to the atmosphere, and the valve lifter 34 is returned by the biasing force of the spring 40 accordingly. Therefore, the compressed air in the pressure chamber 71a of the transmission operating actuator 71 is discharged to the atmosphere via the outlet port 49, the output chamber 32b, the exhaust passage 34a, and the exhaust passage 50.

Also, the solenoid 4 of the electromagnetic shutoff valve 41 '
When 2'is excited, the valve element 44 'is moved downward in FIG. 1, the seat 44'a is separated from the retainer 37', and the seat 44'b is brought into contact with the retainer 45 '. Therefore, the compressed air in the air tank 70 passes through the inlet port 48, the passage 52, and the passage 37'b into the chamber 3
2'e, and further through the passages 37'a, 32f to the first
Is supplied to the pressure chamber 32c. Therefore, the valve lifter 34 is pushed up in FIG. 1 to push up the valve body 33, and separate the valve body 33 from the valve seat 39. Then, the compressed air in the air tank 70 moves from the input chamber 32a to the output chamber 32a.
b is supplied to the pressure chamber 71a of the transmission operating actuator 71 through the outlet port 49, and the transmission operating actuator 71 is operated.

When the solenoid 42 'of the electromagnetic shutoff valve 41' is demagnetized, the spring 47 'returns the valve element 44' to the position shown in FIG. 1 and the exhaust passage 45'a is opened. Therefore, the compressed air in the pressure chamber 32c is discharged to the atmosphere, and accordingly, the valve lifter 34 causes the spring 4 to move.
It is returned by a biasing force of zero. Therefore, the compressed air in the pressure chamber 71a of the transmission operating actuator 71 is supplied to the outlet port 49, the output chamber 32b, and the exhaust passage 34.
a, released to the atmosphere through the exhaust passage 50.

Either one of the above electromagnetic shutoff valves 41 and 41 'is used. When one of the electromagnetic stop valves fails, the other electromagnetic stop valve is replaced with the other electromagnetic stop valve.

FIG. 2 shows another embodiment of the control device for the transmission operating actuator according to the present invention. This control device 60 omits the auxiliary piston 35 in the control device 30 of the above embodiment by adopting the double check valve 61.

In this control device 60, the hole 32 "of the housing 31 into which the retainer 37 is inserted and the retainer 37 '.
And a hole 32 'into which the pressure chamber 32e is inserted, and the passage 32g communicates with the hole 32'.
It communicates via h. And 32g of those passages
Double check valve 6
1 is installed. This double check valve 61
Connects one of the holes 32 'and 32 "to the pressure chamber 32c.

In this control device 60, when the solenoid 42 of the electromagnetic shutoff valve 41 is excited, the pilot passage 37b
Is opened. Then, since the compressed air in the air tank 70 is supplied to the hole 32 ″ through the passage 37a, the shuttle 61a of the double check valve 61 is moved to the left in FIG. 2, and the space between the hole 32 ′ and the pressure chamber 32c is moved. The hole 32 ″ is communicated with the pressure chamber 32c while being closed. Therefore, the compressed air is supplied to the pressure chamber 32c and pushes up the valve lifter 34 to open the valve body 33. Then, the compressed air in the air tank 70 moves from the input chamber 32a to the output chamber 3a.
2b, and is further supplied to the pressure chamber 71a of the transmission operating actuator 71 through the outlet port 49.

When the solenoid 42 of the electromagnetic shutoff valve 41 is in the non-excited state and the electromagnetic shutoff valve 41 'is operated, the compressed air in the air tank 70 is supplied to the hole 32', and the shuttle 61a of the double check valve 61 is opened in FIG. , The hole 32 ″ and the pressure chamber 32 c are closed, and the hole 32 ′ and the pressure chamber 32 c are communicated with each other. Therefore, the compressed air in the air tank 70 is supplied to the pressure chamber 32 c and the valve lifter. 2 is pushed up to open the valve element 33. Therefore, the compressed air in the air tank 70 is supplied from the input chamber 32a to the output chamber 32b, and further through the outlet port 49, the pressure chamber of the transmission operating actuator 71. 71a.

[0031]

As described above, in the control device for the transmission operating actuator according to the present invention, one switching valve is interposed between the pressure chamber of the actuator and the pressure source, and the valve lifter of the switching valve is two. It is designed to operate with two electromagnetic shutoff valves. Therefore, the pressure supply passage between the actuator and the pressure source is simple and a highly responsive device is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a control device for a transmission operating actuator according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the control device for the transmission operating actuator according to the present invention.

FIG. 3 is a control circuit of a conventionally used transmission operating actuator.

FIG. 4 is a cross-sectional view showing a dual type solenoid operated directional control valve used in a control circuit of the transmission operating actuator.

[Explanation of symbols]

 30 control device 31 housing 32 cylinder hole 32a input chamber 32b output chamber 32c, 32d pressure chamber 32e chamber 33 valve body 34 valve lifter 34a exhaust passage 35 auxiliary piston 35a emergency passage 36, 37 retainer 37a, 37b passage 38 spring 39 valve seat 40 Spring 41, 41 'Electromagnetic stop valve 42, 42' Solenoid 43 Housing 44, 44 'Valve body 44a, 44'a, 44b, 44'b Seat 45, 45' Core 45a, 45'a Exhaust passage 46, 46 'Chamber 47,47 'Spring 48 Inlet Port 49 Outlet Port 50 Exhaust Passage 51 Emergency Passage 52 Pilot Passage 53,53' Slit 60 Control Device 61 Double Check Valve 61a Shuttle 70 Air Tank 71 Transmission Actuator Eta 71a Pressure chamber

Claims (1)

[Claims] 1. A valve body, which is arranged between an inlet port connected to a pressure source and an outlet port connected to a transmission operating actuator, and which is urged by a spring to close between the ports, and a spring. Connected to a pressure source and a valve lifter that is energized to make the transmission operating actuator communicate with the atmosphere in an unactuated state, is activated to disconnect the transmission operating actuator from the atmosphere, and opens the valve body. And a pilot passage for operating the valve lifter by the fluid of the pressure source,
An actuator for transmission operation, comprising: two electromagnetic shut-off valves that are interposed in parallel with the pilot passage, close the pilot passage in a non-excited state, and open the pilot passage by being excited. Control device.