JPH08135836A - Oil pressure switching solenoid valve device - Google Patents

Abstract

PURPOSE: To supply oil pressure to hydraulically operated equipment even while a solenoid actuator is not operated by providing a third oil, passage, which communicates first and second oil passages, between the two passages with a valve section by-passed and arranging a manually operable closing valve in the third oil passage. CONSTITUTION: In hydraulically operated equipment such as a pump device mounted on a fire engine, a by-pass passage 54 comprising a valve section 42, which is driven by a solenoid 41, by-passed between oil passages 32 and 34 connected to an oil pump and oil passages 38 and 39 connected to a hydraulic clutch, and a manually operable spool valve 50 is provided across this by-pass passage 54 and drain oil passages 35 and 31. When the solenoid 41 is electrically broken down, hardly supplying hydraulic pressure to the hydraulic clutch, the manually operable spool valve 50 is operated for opening the by-pass passage having been closed and closing the drain oil passage 35 having been opened, supplying hydraulic fluid from the oil pump having stopped oil supplying to the hydraulic clutch through the manually operable valve 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic switching electromagnetic valve device for switching a flow path of hydraulic oil supplied to hydraulically operated equipment by using an electromagnetic actuator.

[0002]

2. Description of the Related Art A pump device installed in a fire truck, a garbage press machine installed in a garbage truck (a vehicle used for compressing and loading garbage), a mixer installed in a mixer truck, etc. The work machines are all driven by the power taken out from the running engine mounted on the vehicle.

In such a vehicle, a hydraulic clutch device (hydraulic actuating device) for turning on and off the transmission of power is provided in the middle of a power transmission system from the power take-out portion to the working machine, and the hydraulic clutch device is turned on and off. A hydraulic circuit for is provided. Then, when the work machine performs work or work, it is possible to connect the power transmission system between the traveling engine and the work machine by switching the hydraulic clutch device from the "disengaged" state to the "engaged" state from the supply of hydraulic pressure. Has been done.

Conventionally, in such a hydraulic circuit, as shown in FIGS. 12 and 13, an oil pump b driven by an engine a mounted on a vehicle (for example, in a vehicle equipped with an automatic transmission, an oil pump for AT hydraulic oil is used). 2) and the inlet of the hydraulic clutch device c are connected via a hydraulic switching electromagnetic valve device, for example, an electromagnetic spool valve d.

Specifically, the electromagnetic spool valve d has an oil passage f connected to the oil pan e, an oil passage g connected to the oil pump b, and an oil passage h connected to the inlet of the hydraulic clutch device c on the inner surface, respectively. A spool j (valve portion) is movably fitted together with a return spring k in an open cylindrical cylinder i, and an electromagnetic solenoid m for axially driving the spool valve j is provided at an end portion of the cylinder i. It has a different structure.

When the electromagnetic spool valve d is demagnetized (OFF) as shown in FIG. 12, the elastic force of the return spring k causes the oil passage h and the oil passage f to form an annular recess n formed in the middle stage of the spool j. Through the oil passage g and the oil passage g
It is blocked by the land p formed in the lower stage of the rule j. Further, when the electromagnetic solenoid m is excited, as shown in FIG. 13, the spool j communicates with the oil passage h and the oil passage g through the annular recess n from the above position, and the oil passage g is formed in the upper stage of the spool j. It is cut off at land p.

That is, when a switch (not shown) is turned to the on side to perform work, the electromagnetic solenoid m is turned on, and the working oil is supplied from the oil pan e pumped by the engine-driven oil pump b to the oil passages g, It is guided to the inlet of the hydraulic clutch device c through the annular recess n and the oil passage h, and the hydraulic clutch device c operates in the direction in which the power is connected, that is, in the contact side, and transmits the power from the engine a to the working machine.

Further, when the switch is operated to the off side, the spool j returns to its original position by the elastic force accumulated in the return spring k, and the hydraulic oil in the hydraulic clutch device c is returned to the oil passage h and the annular recess m. , Is collected in the oil pan e through the oil passage f. As a result, the hydraulic clutch device c returns to the disengaged side again.

[0009]

Generally, most hydraulically actuated devices such as the hydraulic clutch device c excite the electromagnetic valve device such as the electromagnetic spool valve d in advance only when the required operation is obtained as described above. It is designed to accept the hydraulic pressure that is set to a predetermined pressure.

By the way, the working machine mounted on the vehicle is
It may be used for applications where it is inconvenient if the operation is not performed absolutely. Typically, there is a pump device installed in a fire engine.

However, an electromagnetic actuator such as the electromagnetic solenoid of the electromagnetic spool valve d may have an electrical failure (for example, disconnection of lead wire or disconnection of coil) due to its structure.

When this happens, the electromagnetic actuator will be in the same state as when it was demagnetized (turned off) because the supply of electric power was cut off. At this time, if the hydraulically operated device is the hydraulic clutch device c, the output of power from the engine to the work machine is interrupted.

In order to avoid this, it is possible to provide a plurality of independent power takeoff systems. However, this is only structurally complicated and not very good.

Therefore, there is a demand for a structure capable of effective fail-safe with a simple structure. The present invention has been made in view of the above circumstances, and an object thereof is to have a simple structure and to operate hydraulically when the electromagnetic actuator becomes inoperative, like when the electromagnetic actuator is operating. An object of the present invention is to provide a hydraulic switching solenoid valve device capable of sending hydraulic pressure to equipment.

[0015]

According to a first aspect of the present invention, in order to achieve the above object, a first hydraulic pressure source is connected.
The valve portion driven by the electromagnetic actuator is bypassed between the oil passage and the second oil passage connected to the hydraulically actuated device to cause the third oil passage.
An oil passage is provided, a manually operable first opening / closing valve is provided at the third oil passage, and a manually operable second opening / closing valve is provided at the oil discharge passage connected to the oil recovery unit.

According to a second aspect of the present invention, in addition to the above object, the hydraulic switching electromagnetic valve device according to the first aspect is provided in order to immediately deal with this when the electromagnetic actuator becomes inoperative. When the electromagnetic actuator is inoperative, the first opening / closing valve is opened and the second opening / closing valve is closed together with the valve operation.

According to a third aspect of the invention, in addition to the above object, in order to achieve a fail-safe with a compact valve structure, the first aspect of the hydraulic switching electromagnetic valve device according to the first or second aspect is. The on-off valve and the second on-off valve are integrally formed.

In addition to the above object, the invention according to claim 4 provides the hydraulic switching electromagnetic valve device according to claim 3 in order to achieve fail-safe with a structurally simple spool valve. An oil passage and an oil discharge passage each have a cylindrical cylinder having an opening on the inner surface, and one spool fitted in the cylinder so as to be movable in the axial direction. A first land for normally closing the third oil passage, and a second land for closing the drain oil passage on the other end side, with an annular concave portion that normally opens. The first opening / closing valve and the second opening / closing valve are configured by a manual spool valve that has a portion and the drain oil passage is closed by the second land when the third oil passage is opened through the recess.

In addition to the above object, the invention according to claim 5 is directed to claim 4 in order to enable the spool valve to be positioned in a fail-safe position without slipping, with a simple structure. In the hydraulic switching solenoid valve device, the one end side of the spool is reciprocally supported by the screw part,
In addition, a rotation operation section for rotating the spool is provided on one end side or the other end side of the spool.

According to a sixth aspect of the invention, in addition to the above object, in order to achieve fail-safe with a rotary valve that is structurally simple, in the hydraulic switching electromagnetic valve device according to the third aspect, the third aspect of the invention is provided. An oil passage and an oil discharge passage each have a cylindrical cylinder having an opening on the inner surface thereof, and a shaft-shaped valve body rotatably fitted in the cylinder. The valve body has an oil discharge passage. And a first hole portion formed in a radial direction that normally opens the
A manual rotary valve having a second hole formed in a radial direction that normally closes the oil passage, and closing the oil discharge passage when the third oil passage is opened through the second hole. Therefore, the first on-off valve and the second on-off valve are configured.

[0021]

According to the first aspect of the invention, when it becomes difficult to supply the hydraulic pressure to the hydraulically operated equipment due to an electrical failure of the electromagnetic actuator, the first opening / closing valve is opened and the second opening / closing valve is opened. To close.

Then, the hydraulic oil (hydraulic pressure) from the hydraulic source, which has been stopped, flows through the third oil passage, bypasses the valve portion, and is supplied to the hydraulically operated equipment through the second oil passage. Further, the hydraulic oil that attempts to return through the oil discharge passage is shut off by the second opening / closing valve.

As a result, the simple bypass-like oil passage structure around the valve portion serves as a fail-safe for the electromagnetic actuator and promises the operation of the working equipment. According to the second aspect of the invention, if the electromagnetic actuator becomes electrically inoperable and becomes inoperative, the first opening / closing valve is opened, and the second opening / closing valve is closed together with it. An electrical failure of the actuator is immediately dealt with.

According to the third aspect of the present invention, since the first opening / closing valve and the second opening / closing valve have an integrated structure, a compact valve structure is sufficient. According to the invention of claim 4, the manual spool valve is adopted, and the spool is opened from the position where the third oil passage is normally closed and the drain oil passage is normally opened. The hydraulic oil (hydraulic pressure) from the hydraulic power source, which has been stopped to be supplied, is supplied to the hydraulically actuated device by bypassing the valve portion only by operating to the open position.

According to the fifth aspect of the present invention, the spool is moved to the fail-safe position by screw operation by rotating the rotary operation portion provided on one end side or the other end side of the spool. By simply moving the spool, the spool is positioned by the screw restriction so as not to be inadvertently displaced to the same position.

According to the sixth aspect of the present invention, the manual rotary valve is used, and the valve body is opened from the position where the third oil passage is normally closed and the drain oil passage is normally opened. The hydraulic oil (hydraulic pressure) from the hydraulic power source that has stopped being supplied bypasses the valve portion and is supplied to the hydraulically operated equipment only by rotating the oil discharge passage to the open position.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION The first embodiment of the present invention shown in FIGS.
A description will be given based on the embodiment. FIG. 1 shows an engine output unit equipped with a PTO device (power take-out device) to which the present invention is applied. In the figure, 1 is an engine, for example, a running engine mounted on a vehicle.

This running engine 1 has an output shaft 2 extending in the left-right direction on the lower side. An automatic transmission 4 is connected to an end of the output shaft 2 via a PTO device 3.

The automatic transmission 4 is, for example, in a housing case 5, a torque converter (T / C) 6, which is connected in series with the output shaft 2, and a planetary gear type transmission (T) which is hydraulically controlled. / M) 7 is provided. The output part of the transmission 7 is connected to the drive wheels (not shown) of the vehicle via a power transmission system,
According to the mode of the shift range selected by the selector lever (not shown) connected to the transmission 7, the rotation output from the traveling engine 1 is shifted and transmitted to the drive wheels. The transmission 7 is provided with an oil pump 8 for generating a hydraulic pressure required for hydraulic control of gear shifting, and an operating oil 9 required for hydraulic control of the transmission 7 is provided at an inner bottom portion of the housing case 5. Oil pan 10 to store
(Corresponding to the oil recovery unit) is provided.

On the other hand, the PTO device 3 is the running engine 1
Has a gear case 14 connected to the cylinder block 1a. The gear case 14 is composed of a flat closed case whose left and right sides (the direction in which the engine 1 and the automatic transmission 4 are lined up) are flat and whose upper portion extends upward beyond the housing case 5.

Inside the gear case 14, a drive gear 11, an idle gear 12, and a power take-off gear 13 are rotatably housed in order from the bottom. The respective gears are in mesh with each other, and the shaft center portion of the drive gear 11 among them is fixed between the output shaft end of the traveling engine 1 and the input shaft end of the torque converter 6.

At the axial center of the power take-off gear 13, the running engine 1 is provided from the upper portion of the housing case 5.
The output shaft 13a protruding to the right of is connected. Further, a connecting shaft portion 15 is connected in series to the tip of the output shaft 13a. The tip portion of the connecting shaft portion 15 is connectable to an input shaft 16 of a working machine (not shown) such as a pump device, a dust press machine, a mixer, etc. mounted on a vehicle, and is taken out from the running engine 1. Power is transmitted to the work machine.

Further, between the output shaft 13a and the connecting shaft portion 15, a multi-plate type hydraulic clutch device 17 (corresponding to a hydraulically operating device) for connecting and disconnecting a power transmission system from the running engine 1 to the connecting shaft portion 15 is turned on and off. Is installed.

That is, the hydraulic clutch device 17 is located on the right side of the gear case 14 and is connected to the output shaft 13a and the connecting shaft portion 1.
It is housed in a hermetically sealed case 18 which covers a portion between the first and second parts. The closed case 18 is formed by a bottomed cylindrical housing 18a laterally connected to the gear case 14 and a cover 18b closing an opening on the side of the housing 18a. .

The hydraulic clutch device 17 will now be described. 19a is a large number of clutch plates on the driving side arranged along the axial direction around the end of the connecting shaft portion 15 at a predetermined interval, and 19b is the driving force. It is a large number of driven clutch plates arranged at a predetermined interval so as to be alternately arranged with the side clutch plates 19a. Both clutch plates are annular flat plates.

Each outer peripheral portion of the driving side clutch plate 19a is a bottomed cylindrical holder 2 fixed to the tip of the output shaft 13a.
We support 0. Each inner peripheral portion of the driven side clutch plate 19b is supported by a cylindrical holder 21. This holder
Reference numeral 21 is slidably supported in the axial direction via a spline portion 22 provided on the outer periphery of the base end portion of the connecting shaft portion 15 so that the driven side clutch plate as a whole can be brought into and out of contact with the driving side clutch plate 19a. . In addition, the spline portion 22 is the connecting shaft portion 1
5, an axially extending multi-line spline groove 22a and a tubular body 22b slidably fitted into the connecting shaft portion 15 so as to fill the spline groove 22a.

The right end of the holder 21 extends toward the cover 18b. A boss portion 18c protruding from the back surface of the cover 18b is slidably fitted and inserted into an annular portion surrounded by the extending portion 21a extending in the right direction and the connecting shaft portion 15. 18c receives the right side portion of the holder 21.

A flange-shaped pressure receiving plate 23 is formed on the outer peripheral surface of the extending portion 21a as shown in FIG. The entire pressure receiving plate 23 is reciprocally fitted into a disk-shaped cylinder 24 installed on the cover 18b side in the closed case 18, and the pressure receiving plate 23 is displaced toward the left end in the cylinder 24. For example, if the driven side clutch plate 19b moves away from the driving side clutch plate 19a and is displaced toward the right end on the contrary, the driven side clutch plate 19b will move to the driving side clutch plate 1.
It is in contact with 9b. The cylinder 24 is
A bottomed cylindrical cylinder body 24a having an opening fixed to the back side of the cover 18b and directed to the right side, and the cylinder body 24.
It is combined with a cover 24b that closes the opening of a.

A return spring 25 for urging the pressure receiving plate 23 to the left is interposed in a space formed on the right side of the cylinder 24 with the pressure receiving plate 23 as a boundary, and is normally connected to the driven side clutch plate 19b. The clutch plate 19a on the driving side is separated from the clutch plate 19a.

A space formed on the left side of the cylinder 24 serves as a pressure receiving chamber 26. When hydraulic pressure is supplied to the pressure receiving chamber 26, the driven side clutch plate 19b and the driving side clutch plate 19 are provided.
Close contact with a.

The pressure receiving chamber 2 of such a hydraulic clutch device 17
6 is connected to an oil pump 8 of the automatic transmission 4 serving as a hydraulic pressure source via a hydraulic switching electromagnetic valve device installed on the side of the cover 18b, for example, an electromagnetic spool valve 40.

The hydraulic clutch device 17 can be turned on and off in order to operate the working machine by the exciting operation of the electromagnetic spool valve 40. That is, the structure of the electromagnetic spool valve 40 will be described. In FIG. 2 to FIG. 4, FIG. 6, and FIG. 7, 27 is a mounting seat formed so as to project from the outer peripheral portion of the cover 18b. The mounting seat 27 is
For example, it is formed in an oval shape extending in the left-right direction. A cylindrical cylinder 28 extending toward the connecting shaft portion 15 is formed on the right side portion of the mounting seat 27.

On the inner surface of the middle portion of the cylinder 28,
Three annular grooves 29 to 31 are provided at predetermined intervals in the axial direction. Of these, the annular groove 31 on the bottom side of the cylinder 28 is
The oil inlet 33 formed in the boss 27b protruding from the lower portion of the boss 27a communicates with a passage 32 formed inside the boss 27a of the mounting seat 27. The oil inlet 33 is connected to the transmission 7 via the relay pipe 34.
Is connected to the discharge part of the oil pump 8. An oil passage (first oil passage) that connects the hydraulic source and the cylinder 28 from such a passage is configured.

The annular groove 29 on the opening side communicates with the discharge port 36 in the boss portion 27c protruding from the left side portion of the boss-shaped portion 27 through the passage 35 formed inside the boss-shaped portion 27a. There is. This discharge port 36 is connected via a relay pipe 37.
It is connected to the oil pan 10 of the transmission 7 and constitutes an oil discharge passage that connects the electromagnetic spool valve 40 and the oil pan 10 from such a flow passage.

The annular groove 30 in the middle is formed by the boss 2
7a and the passage 38 formed in the boss portion 18c of the cover 18b, the annular groove 38a formed in the outer peripheral surface of the boss portion 18c, and the passage 39 formed in the holder portion on the base side of the pressure receiving plate 23 through the pressure receiving chamber. It communicates with 26. An oil passage (second oil passage) that connects the electromagnetic spool valve 40 and the inlet of the hydraulic clutch device 17 from such a passage.
Is composed.

An electromagnetic solenoid 41 (corresponding to an electromagnetic actuator) is installed at the open end of the cylinder 28. In the cylinder 28, one spool 42 (corresponding to a valve portion) axially driven by an electromagnetic solenoid 41 is slidably fitted. The spool 42 is formed with an annular recess 43 in the outer peripheral portion of the spool which communicates between the annular grooves. The smooth outer peripheral surface portions on both sides of the annular recess 43 are used as lands 44 and 45 for closing.

A return spring 46 is interposed between the spool 41 and the cylinder end and constitutes the entire electromagnetic siple valve 40. That is, due to the elastic force of the return spring 46, in a normal state, that is, when the electromagnetic sleeve valve 40 is demagnetized (OFF), the annular groove 29 and the annular groove 30 are connected via the annular recess 43 as shown in FIG. The communication and the annular groove 31 are blocked by the land 45 on the tip side so that the hydraulic oil 9 from the oil pump 8 is not supplied to the pressure receiving chamber 26.

When the electromagnetic solenoid 41 is excited (turned on) in the electromagnetic spool valve 40, the spool 41 is moved from the off position to the annular groove 30 and the annular groove 31 in an annular shape as shown in FIG. 4B. The function of communicating through the recess 43 and displacing the annular groove 29 to a position where it is blocked by the land 44 on the base side is set so that the hydraulic pressure generated by the oil pump 8 can be supplied to the pressure receiving chamber 26 during excitation. There is.

In FIG. 2, reference numeral 48 denotes the electromagnetic spool valve 4
A PTO switch for turning 0 on and off is shown. Further, on the left side portion of the mounting seat 27 adjacent to the electromagnetic solenoid 41,
A manual spool valve 50 (corresponding to the first opening / closing valve and the second opening / closing valve) is provided for compensating the function when the electromagnetic spool valve 40 fails. The structure around the manual spool valve 50 is shown in FIGS. 3 and 4 to 7.

Explaining the structure of the manual spool valve 50, 51 is formed on the left side portion of the mounting seat 27.
It is a cylindrical cylinder parallel to the cylinder 28 of the electromagnetic spool valve 40.

On the inner surface of the middle portion of the cylinder 51,
Two annular grooves 52, 53 are provided at a predetermined interval in the axial direction. Of these, the annular groove 53 on the bottom side of the cylinder 51 is
It intersects (communication) with the passage 35 that constitutes the oil discharge passage.

Further, the annular groove 52 on the opening side bypasses the electromagnetic spool valve 40, and a bypass passage 54 (corresponding to a third oil passage) branched from the passage 38 connected to the hydraulic clutch device 17 and the passage 32 connected to the oil pump 8. ) Is connected to the communication. However, the bypass passage 53 has the boss 27a.
It is formed inside.

A spool 56 is slidably fitted in the cylinder 51. This spool 56
The threaded portion 57 is formed at the tip end portion, and the hexagonal rotary operation portion 58 similar to, for example, a bolt head portion is formed at the base end portion. The rotation operating portion 58 projects from the cylinder 51 to the outside.

The male thread portion 57 of the spool 56 is formed at the bottom of the cylinder 51 and is screwed so as to be able to move forward and backward until the rotation operation portion 58 is regulated (contacted) at the cylinder opening end. is there. By this screw insertion, the spool 56 is supported so as to be capable of reciprocating with the position where it abuts against the opening end of the cylinder as a base point. That is, when the rotary operation portion 59 is rotated with a tool or the like, the entire spool moves in a direction in which it is projected to the outside.

The spool 56 is provided only in the middle outer peripheral portion,
An annular recess 59 is formed for communicating one annular groove. The outer peripheral surface portions on both sides of the annular recess 59 are used as closing lands 60 and 61 (corresponding to the first land portion and the second land portion).

These annular recess 59, lands 60, 61
As shown in FIG. 5A, when the spool 56 moves normally at the cylinder opening end, the oil discharge passage is opened by the annular recess 59 and the bypass passage 54 is opened at the base (root) side. It is set to shut off at the land 60. With this setting, the oil drain passage is normally closed and the bypass passage 5
4 is open.

As shown in FIG. 5B, when the spool 56 is pulled out to the outside by a predetermined amount as shown in FIG. 5B, the bypass passage 54 is opened by the annular recess 59 and the oil discharge passage is opened. The land 61 on the tip side
It is also designed to shut off with.

A manual spool in which an opening / closing valve section 50a (corresponding to a first opening / closing valve) for opening / closing the bypass path 54 and an opening / closing valve section 50b (corresponding to a second opening / closing valve) for opening / closing the oil discharge path are integrated. The valve 50 causes the solenoid spool valve 40 to malfunction due to a failure.
When becomes inoperative, instead of the electromagnetic spool valve 40, the working oil 9 (hydraulic pressure) from the oil pump 8 can be supplied to the pressure receiving chamber 26 of the hydraulic clutch device 17.

Next, the operation of the power take-off system thus constructed will be described. Output shaft 2 of running engine 1
The rotation output from is transmitted to the drive gear 11 of the PTO device 3.

This rotation is transmitted to the drive wheels (not shown) of the vehicle through the torque converter 6 and the transmission 7, and becomes the driving force for running the vehicle. The drive force transmitted to the transmission 7 causes the oil pump 8 of the transmission 7 to operate, so that the hydraulic oil 9 collected in the oil pan 10 is transferred to the relay pipe 34, the oil inlet 33, and the passage 32. It is pumped.

On the other hand, the rotation transmitted to the drive gear 11 is
After the idle gear 12 and the power take-off gear 13,
It is transmitted to the output shaft 13a. Here, it is assumed that the PTO switch lever 48 is off (the working machine is not used).

At this time, as shown in FIGS. 4 (a) and 8, the annular groove 31 of the electromagnetic spool valve 40 has the land 4
Since it is closed by 5, the flow path from the oil pump 8 to the pressure receiving chamber 26 is blocked.

This means that the driven clutch plate 19b of the hydraulic clutch device 17 remains positioned at the disengaged position away from the driving clutch plate 19a by the return spring 25, and the output shaft 13a is connected to the connecting shaft portion 15. Power is not transmitted to. That is, the work machine does not operate.

When the electromagnetic spool valve 40 is off, the flow path from the pressure receiving chamber 26 to the oil pan 10 is open via the annular recess 43, and the hydraulic oil 9 in the pressure receiving chamber 26 is collected. ing.

Thereafter, the PTO switch lever 48 is turned on to perform the necessary work. Then, the electromagnetic solenoid 41 is excited, the operating rod 41a connected to the electromagnetic solenoid 41 moves forward, and the spool 42 slides to the flow path switching position on the cylinder bottom side as shown in FIG. 4B.

That is, in the spool 42, the position where the annular recess 43 allows the annular groove 30 and the annular groove 31 to communicate with each other, the land 4
4 is positioned so as to close the annular groove 29. As a result, as shown in FIGS. 3 and 9, the hydraulic oil 9 from the oil pump 8 passes through the annular groove 31, the annular groove 30, the passage 38, and the annular groove 38a, and becomes a passage serving as an inlet portion of the hydraulic clutch device 17. It is guided to 39 and pressed into the pressure receiving chamber 26.

In response to this hydraulic pressure, the pressure receiving plate 23 is displaced to the right side (cover 18b side) to displace the holder 21,
The driven clutch plate 19a is brought into pressure contact with the driven clutch plate 19b.

Then, the power output to the output shaft 13a is the driving side clutch plate 19a and the driven side clutch plate 19a.
Work machine (not shown) is transmitted to the connecting shaft portion 15 via b and through the input shaft 16 connected to the connecting shaft portion 15.
Drive.

As a result, the work machine performs the desired work with the power taken out from the running engine 1. Here, the electromagnetic solenoid 41 of the electromagnetic spool valve 40
However, for example, it is assumed that an electrical failure (breakage of lead wire, breakage of coil, etc.) has occurred.

The electromagnetic spool valve 40 is an electromagnetic on-off valve that keeps the supply system of the hydraulic oil 9 at a desired level by the exciting operation. Therefore, when such a failure occurs, the spool 40 returns to the original standby position. .

Then, the hydraulic oil 9 is not supplied to the pressure receiving chamber 26, and it becomes difficult to maintain the hydraulic clutch device 17 in the contact state. As it is, it is difficult to keep the working device operating.

Therefore, when it is confirmed that the electromagnetic spool valve 40 is inoperative, the rotary operation portion 58 of the manual spool valve 50 adjacent to the electromagnetic spool valve 40 is immediately rotated by a tool to rotate the spool 50. Displace in the direction to pull out (backward).

The operation of pulling out the spool 50 is shown in FIG.
As shown in (b), the bypass passage 54 has an annular recess 59.
Repeat until it communicates with. Then, as shown in FIG. 10, the hydraulic oil 9 from the oil pump 8 whose supply is stopped is
It is guided to the passage 38 through the bypass passage 54 and the annular groove 52,
It is pressed into the pressure receiving chamber 26 through the annular groove 38a.

As a result, in the hydraulic clutch device 17, the driven side clutch plate 19b is brought into pressure contact with the driving side clutch plate 19a by hydraulic pressure to transmit power to the working machine (not shown), as when the electromagnetic spool valve 40 is turned on. . The hydraulic oil 9 that is about to return through the oil discharge passage is the land 6
Since the same channel is blocked by closing the annular groove 53 by 1, the system returning to the oil pan 10 is not affected.

This means that the simple bypass oil passage structure around the electromagnetic spool valve 40 becomes an effective fail-safe for the electromagnetic spool valve 40. Therefore, with a simple structure, when the electromagnetic solenoid 41 is deactivated, hydraulic pressure can be sent to the hydraulic clutch device 17 (hydraulic actuating device) as when the electromagnetic solenoid 41 was activated.

Moreover, this is only required to open the opening / closing valve portion 50a for opening / closing the bypass passage 54, and to close the opening / closing valve portion 50b for opening / closing the drainage passage together with the valve operation, thereby deactivating the electromagnetic solenoid 41. I can deal with it immediately.

In addition, the valve structure can be made compact by adopting a structure in which the on-off valve parts 50a and 50b are integrated. Especially by adopting the manual spool valve 50, the structure is simple.

Further, since the manual spool valve 50 is constructed so as to be operated by the reciprocating support by the screw and the rotating operation by the rotating operation portion 58, the spool 56 is moved to the fail-safe position by screw feeding. Only by doing so, there is an effect that the spool 56 can be positioned so as not to accidentally shift to the same position due to the screw regulation.

FIG. 11 shows a second embodiment of the present invention.
The present embodiment shows an example in which a manual rotary valve 70 that switches a flow path by turning is used as a valve for compensating the function when the electromagnetic opening / closing valve fails.

That is, in the manual rotary valve 70, like the manual spool valve, a cylindrical cylinder 71 is provided in the installation seat 27, and one shaft-shaped valve element 72 is rotatably fitted in the cylinder 71. With the open valve, simply rotate the valve body 72,
It has a structure that can switch the flow path.

Specifically, the inner portion of the cylinder 71 on both sides in the axial direction is open at an intermediate portion of the bypass passage 54 and further at an intermediate portion of the passage 35 constituting the oil discharge passage. In addition, 73a is an opening of the bypass 54, 73b
Indicate the openings of the passages 35, respectively.

Further, in the shaft portion corresponding to each position of each opening portion 73a, 73b of the valve body 72, the through hole 7 penetrating in the radial direction is formed.
4a and 74b are drilled. As a result, similar to the first embodiment, the on-off valve 50a that opens and closes the bypass 54.
And an on-off valve 50b that opens and closes the oil discharge passage are integrated.

Of the through holes 74a and 74b, the through hole 74a is arranged so as to close the bypass passage 54, and the through hole 74b is arranged so as to open the passage 35. Further, both the through holes 74a and 74b are set in a positional relationship in which the passage 74b is arranged so as to close the passage 35 when the passage 74a opens the bypass passage 54.

The valve body 72 is normally set at a position where the bypass passage 54 is closed (normally closed) and the passage 35 is opened (normally open) as shown in FIG. 11 (a). When the electromagnetic spool 40 fails and becomes inoperative, the valve body 7
As shown in FIG. 11 (b), the rotation operation part, such as the lever 75, provided at the end of the second position is, for example, 90 ° from the normal position.
When it is rotated, the closed bypass passage 54 is opened and the opened passage 35 is closed. As with the first embodiment, the hydraulic oil 9 from the oil pump 8 whose supply has been stopped has been stopped.
Will be supplied to the pressure receiving chamber 26 of the hydraulic clutch device 17.

Even in this case, as in the case where the manual spool valve 40 is used, fail-safe can be achieved with a simple valve structure. Of course, other valve devices may be used.

However, the present embodiment is different in that a manual rotary valve 70 is provided in place of the manual rotary valve 50 of the first embodiment, and other parts are the same as the first embodiment, and therefore the same. The parts are omitted or given the same reference numerals as those in the first embodiment, and the description thereof is omitted.

In the above-described embodiment, the valve device in which the opening / closing valve for opening / closing the bypass passage and the opening / closing valve for opening / closing the oil discharge passage are integrated in order to simplify the operation, is used. It may be a separate body if this is not taken into consideration.

In the above-described embodiment, the present invention is applied to the structure for controlling the hydraulic clutch device, but the present invention is not limited to this.
The present invention may be applied to a structure for controlling another hydraulically operated device.

[0089]

As described above, according to the invention as set forth in claim 1, the first opening / closing valve and the second opening / closing valve are provided in the oil passage around the valve portion driven by the electromagnetic actuator. With the structure, there is an effect of fail-safe, that is, when the electromagnetic actuator becomes inoperative, the hydraulic pressure can be sent to the hydraulically actuated device in the same manner as when the electromagnetic actuator is operating.

According to the second aspect of the present invention, in addition to the above effect, when the electromagnetic actuator becomes inoperative, hydraulic oil can be promptly supplied to the hydraulically operated equipment. .

According to the third aspect of the present invention, in addition to the above effects, fail-safe can be achieved with a compact valve structure. According to the invention described in claim 4, in addition to the above effect, a fail valve can be achieved with a spool valve that is structurally simple.

According to the fifth aspect of the present invention, in addition to the above effect, the spool valve can be positioned at a fail-safe position with a simple structure without shifting. According to the invention of claim 6, in addition to the above effects,
A fail valve can be achieved with a rotary valve that is structurally simple.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure around a PTO device equipped with a hydraulic switching solenoid valve device according to a first embodiment of the present invention.

FIG. 2 is a side view showing a portion of the same structure where an electromagnetic spool valve serving as a hydraulic pressure switching electromagnetic valve device and a manual spool valve fail-safe for the electromagnetic spool valve are installed.

FIG. 3 is a partial cross-sectional side view showing the electromagnetic spool valve and the electromagnetic spool valve together with a hydraulic clutch device and a passage leading between them.

4 (a) is a side sectional view around the electromagnetic spool valve taken along the line AA in FIG. FIG. 4B shows the same electromagnetic sp
FIG. 3 is a side sectional view for explaining switching of flow paths when the valve is turned on.

5 (a) is a side sectional view around the manual spool valve taken along the line BB in FIG. FIG. 5B shows the same manual sp
FIG. 3 is a side sectional view for explaining switching of flow paths when operating a valve.

6 is a plan cross-sectional view around an electromagnetic spool valve and a manual spool valve taken along the line C-C in FIG.

FIG. 7 is a perspective view showing an area around an electromagnetic spool valve and a manual spool valve together with a passage leading to an inlet portion of a hydraulic clutch device.

FIG. 8 is a perspective view for explaining the flow of hydraulic oil when the electromagnetic spool valve is normal (OFF).

FIG. 9 is a perspective view for explaining the flow of hydraulic oil when the electromagnetic spool valve is operating (ON).

FIG. 10 is a perspective view for explaining the flow of hydraulic oil when the electromagnetic spool valve becomes inoperative and the manual spool valve is operated in order to perform failsafe from this state.

FIG. 11A is a perspective view for explaining a manual rotary valve, which is a main part of a second embodiment of the present invention. FIG.
FIG. 1 (b) is a perspective view for explaining a state when the manual rotary valve is operated for fail-safe.

FIG. 12 is a view for explaining a conventional system for supplying hydraulic oil discharged from an engine-driven oil pump to hydraulically operated equipment by using an electromagnetic opening / closing valve.

FIG. 13 is a diagram for explaining a process until the hydraulic oil is guided to a hydraulically operated device by switching the flow path of an electromagnetic opening / closing valve.

[Explanation of symbols]

1 ... Running engine 3 ... PTO device 6
... torque converter 7 ... transmission 8 ... oil pump (hydraulic power source) 9 ... hydraulic oil 10 ... oil pan (oil recovery part) 17 ... hydraulic clutch device (hydraulic operating device) 1
8 ... Sealing case 27 ... Installation seat 32, 34 ... Passage, relay pipe (first oil passage) 35, 37 ... Passage, relay pipe (oil drainage passage) 38, 3
9 ... Passage (second oil passage) 40 ... Electromagnetic spool valve 41 ... Electromagnetic solenoid (electromagnetic actuator) 42 ... Spool (valve part) 50 ... Manual spool valve 50a, 50b ... Open / close valve part (first open / close valve, second open / close) Valve) 51 ... Cylinder 54 ... Bypass passage (second oil passage) 55 ... Female thread portion 56 ... Spool 5
7 ... Male screw part 58 ... Rotating operation part 59 ... Rod-shaped recess 60, 6
1 ... Land 70 ... Manual rotary valve 71 ... Cylinder 7
2 ... Valve body 74a ... Through hole (first hole portion) 74b ... Through hole (second hole portion)
75 ... Lever

Claims (6)

[Claims] 1. A first oil passage connected to a hydraulic pressure source, a second oil passage connected to a hydraulically actuated device, and an oil discharge passage connected to an oil recovery unit are respectively communicated, and the second oil passage is connected to the second oil passage by driving an electromagnetic actuator. A hydraulic pressure switch configured to include a valve portion for switching to either one of the first oil passage and the drain oil passage, and for communicating the second oil passage and the drain oil passage when the electromagnetic actuator is demagnetized. In the solenoid valve device, a third oil passage is provided between the first oil passage and the second oil passage, the third oil passage bypassing the valve portion and communicating between the oil passages, and in the third oil passage, A hydraulic switching electromagnetic valve device comprising a manually operable first opening / closing valve, and a manually operable second opening / closing valve provided in the oil discharge passage. 2. The hydraulic switching electromagnetic valve device according to claim 1, wherein when the electromagnetic actuator is not operating,
A hydraulic switching electromagnetic valve device characterized by opening the first opening / closing valve, closing the second opening / closing valve together with the valve operation, and guiding the working oil from the hydraulic pressure source to the hydraulic working device. 3. The hydraulic switching electromagnetic valve according to claim 1 or 2, wherein the first opening / closing valve and the second opening / closing valve are integrally formed. apparatus. 4. The hydraulic switching electromagnetic valve device according to claim 3, wherein the first opening / closing valve and the second opening / closing valve are tubular shapes in which the third oil passage and the drain oil passage are open to the inner surface. Of the cylinder and one spool fitted in the cylinder so as to be movable in the axial direction, and the outer peripheral portion of the spool has an annular recess for normally opening the oil discharge passage. A first land that normally closes the third oil passage is provided on one end side across the recess, and a second land portion is provided on the other end side for closing the oil discharge passage. When the third oil passage is opened, the drain oil passage is constituted by a manual spool valve that is closed by the second land. 5. The hydraulic switching electromagnetic valve device according to claim 4, wherein one end side of the spool is reciprocally supported by a screw portion, and the one end side of the spool,
Alternatively, the hydraulic switching electromagnetic valve device is characterized in that a rotary operation section for rotationally operating the spool is provided on one of the other end sides. 6. The hydraulic switching electromagnetic valve device according to claim 3, wherein the first opening / closing valve and the second opening / closing valve are tubular shapes in which the third oil passage and the drain oil passage are open to the inner surface. Cylinder and one shaft-shaped valve body rotatably fitted in the cylinder, and the valve body is bored in a radial direction in which the oil discharge passage is normally opened. Has a first hole portion and a second hole portion formed in a radial direction that normally closes the third oil passage. When the third oil passage is opened through the second hole portion, the drainage is performed. A hydraulic switching electromagnetic valve device comprising a manual rotary valve for closing an oil passage.