JPH02102829A - Operation control device for power take-off device in work vehicle - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Field of Application of J+) The present invention relates to an operation control device for a power extraction device in a work vehicle such as a dump truck or a garbage collection vehicle. In such work vehicles, engine power is guided to a power extraction device, and a driven body such as a hydraulic pump is driven through the power extraction device to perform work as appropriate.

By the way, the power take-off device is linked to the transmission, so when it is connected or disconnected, the transmission
It is necessary to synchronize the output gear of the system and the input gear of the power take-off device. Therefore, when operating the operating switch or control lever that connects/disconnects the power take-off device installed in the operator's cab, the operator must first release the clutch. 7 (Problem to be Solved by the Invention) In such a work vehicle, an operator must manually disconnect and disconnect the power take-off device in the driver's cab. In other words, when it is necessary to connect or disconnect the power take-off device, there is a drawback that the clutch cannot be used when the power take-off device needs to be connected or disconnected. The present invention was made in view of the above three points, and it is possible to easily operate the power take-off device from a position away from the driver's seat. An object of the present invention is to provide an operation control device for a power take-off device in a work vehicle that can be operated reliably remotely.

(Means for Solving the Problems) The present invention provides a work vehicle in which a driven body such as a pump is driven by a vehicle engine via a power extraction device, and a clutch actuator that connects and disconnects a clutch;
A power take-off device actuator that connects and disconnects the power take-off device, a fluid source that operates these actuators, and a fluid source that is disposed in piping that connects the clutch actuator and the fluid source, and the power take-off device actuator and the fluid source, respectively. It consists of a solenoid valve and an operation panel disposed at an appropriate position on the vehicle and provided with an operation switch for connecting and disconnecting the power extraction device, and the clutch actuator and the power extraction device are controlled via the control means by switching the operation switch. The actuators are configured to operate sequentially.

(Function) If work is required at a work site, when the start operation switch on the operation panel is operated while checking the work site, the clutch actuator is activated and the clutch is disengaged. When the clutch is disengaged, the power take-off device actuator is then activated to connect the power take-off device,
Drives a driven object such as a pump. When the power take-off device is engaged, the clutch actuator returns to its original position and engages the clutch.

On the other hand, when stopping work, operating the stop operation switch will cause the clutch actuator to disengage the clutch, the power take-off device actuator to disengage the power take-off device, and the clutch actuator to return to engage the clutch. The work by the driven body is stopped.

(Example) Examples of the present invention will be described below based on the drawings.
The figure shows a piping system for controlling the connection and disconnection of the power extraction device 1 and the clutch 2.

As is well known in the art, this power extraction device 1 is connected to a transmission (not shown) in order to extract engine power, and when the transmission is connected, it rotates a driven body 3 such as a water pump or a hydraulic pump.

Further, the clutch 2 is linked to a booster 4, and the booster 4 is connected via piping to a switching crank 5. and,
This switching cylinder 5 is connected via piping to a clutch cylinder 7 that is linked to a clutch pedal 6 disposed in the driver's cab. Further, the switching cylinder 5 is pipe-connected to an auxiliary mask cylinder 8, and the spool of the auxiliary mask cylinder 8 is connected to the tip of a bell crank 9 which is rotatably supported via a bracket.

On the other hand, a vacuum chamber 10 as a clutch actuator is connected to the base of the bell crank 9, and the vacuum chamber 10 is connected to a vacuum tank 12 via a pipe in which a solenoid valve 11 is provided.

Further, the power take-off device 1 described above is connected to the tip of the bell crank 13, and the base of the bell crank 13 is connected to an actuator for the power take-off device and vacuum chambers 1-5. The vacuum chamber 14 is connected to the vacuum tank 12 described above via a pipe provided with a solenoid valve 15.

These solenoid valves II and 15 are switching solenoids 5OLI and 5QL2, respectively, and are normally located at the central position communicating with the atmosphere and are connected to the vacuum chambers 10 and 1.
Atmospheric pressure is applied to 4.

The MI vacuum tank 12 is provided with a pressure sensor S to detect when its pressure has reached a set pressure or higher, and is also connected to a vacuum pump 16, which is not shown in detail. is driven by engine power.

In this embodiment, a fluid source configured with a vacuum pump 16 and a vacuum tank 12 is shown as a fluid source for operating the power take-off device 1 and the connecting/disconnecting actuator 10.14 of the clutch 2. In this case, an air cylinder may be used as the actuator, and furthermore, pressure oil from a power steering hydraulic pump driven by engine power may be used.

By the way, a limit switch L S 2 as an electrical contact is disposed at an appropriate position on the vehicle body in order to detect that the power extraction device 1 has been switched to the contact position.
In order to detect that the clutch 2 has been switched to the disengaged position, a limit switch LSI as an electrical contact is provided.

Furthermore, in order to detect that the engine E is in an idling state, an engine rotation speed sensor t-33 is provided. This engine rotation speed sensor L S 3 is the second
As shown in the figure, it is actuated by a lever 18 provided in the middle of a control rod 17 linked to a governor lever 19, and when the governor lever 19 is pulled toward the speed increasing side via the control rod 17, the lever 18 moves the engine rotation speed sensor LS3. This is to stop the output when the engine speed is in the idle link state.

Although the limit switch LSI is shown as being installed corresponding to the rotation limit position of the bell crank 9, its mounting position is not limited, and the limit switch LSI is installed in a position corresponding to the limit switch LS2 and the engine rotation speed sensor LS3. The same applies to

Next, FIG. 3 shows the limit switches LS1, LS
2. A control means C is shown that switches and controls the electromagnetic valve 11.15 in response to the detection operations of the pressure sensor VS and the engine speed sensor LS3.

The control means C includes a power source B such as a battery, an ignition switch IG, a limit switch LS1 . LS2,
Engine speed sensor LS3, pressure sensor VS, IJL
/-X1. X2. X3゜X4. +11. R2, R3, R
4, Ql, Q2 and its relay contact x1. x2. x3.
x4. r 1゜r2. r3. r4. ql, q2. The switching solenoids 5QL1.3OL2 of the solenoid valves 11 and 15, the driver's cab side PTO switch psw, the main switch MS, the lighting switch SW, the start operation switch PH1, the stop operation switch P[32, and the pilot lamps PLI to PL4 are wired and connected as appropriate. It is composed of

Next, the operation of the embodiment of the present invention will be explained.

First, after starting the engine E by operating the ignition switch IG, the main switch MS on the operation panel (not shown) is placed at an appropriate position depending on the work content of the work vehicle.
When you turn on, relay x4 is energized and its normally closed contact (
Since the contact x4 (hereinafter referred to as a contact) is closed, the pilot lamp PL4 lights up to notify that the power supply voltage is acting on the operation panel side. At this time, since the normally closed contacts (hereinafter referred to as contacts) x4 of the relays x4 are opened, the chassis side PTOH path will not operate even if the PTO switch PSW installed on the driver's cab side is operated. .

Here, if the pressure in the vacuum tank 12 is less than a specified value, the pressure sensor ■S is switched and the relay XI is energized. As a result, the a contact xl is closed, the pilot lamp PLI is lit, and ffl is emitted, and at the same time, the b contact x1 is opened, and the starting operation switch PBI or disconnection is activated to connect the power take-off device l. - Even if the operation switch PB2 is operated, the relay R1 or Ql will not be energized, and the power take-off device 1 will not be activated or disconnected.

Also, if engine E is not in the idle link state,
Engine speed sensor [, S3 is open and does not energize relay x2. Therefore, the a contact x2 does not close, and even if the start operation switch FBI or stop operation switch PB2 is operated, relay
1 is not excited, and similarly the power take-off device 1 is not operated to connect or disconnect.

Here, when the vacuum pressure of the vacuum tank 12 mentioned above is above a predetermined value and the engine E is in an idling state, the pressure sensor ■S is opened, the pilot lamp P L 1 is not lit, and the engine rotation speed is Sensor L
S3 is closed.

If you operate the start operation switch FBI in this state, the a contact x2. B contact r4. The relay R1 is energized via the b contact x1, and the relay R1 is self-held via the a contact rl, and at the same time, the solenoid 5OLI is energized.

When the solenoid Sol,l is energized, the solenoid valve 11 is switched to the lower position and the negative pressure of the vacuum tank 12 is applied to the vacuum chamber 10. Therefore, as a result of pulling the bell crank 9 counterclockwise, the spool of the auxiliary mask cylinder 8 is pressed, and the pressure oil flowing into the stroke of the spool is applied to the booster 4 via the switching cylinder 5. , the clutch 2 is disengaged. When the clutch 2 is disengaged, specifically when the bell crank 9 presses the spool of the auxiliary mask cylinder 8 to the stroke end, the limit switch LSI is switched.

Opening of the limit switch LSI excites relay R2, and its a contact r2. Relay R3 via b contact q2
Excite. Then, relay R is connected via the a contact r3.
3 and simultaneously energizes the solenoid 5QL2. Excitation of the solenoid 5QL2 switches the solenoid valve 15 to the upper position, causing the zero pressure of the vacuum tank 12 to act on the vacuum chamber 14 in the same manner as described above.

Therefore, the bell crank 13 is pulled so as to rotate clockwise, switches the power extraction device 1 to the contact side, and drives the driven body 3 such as a pump. The contact operation of the power take-off device l, specifically the rotation of the bell crank 13, is
Since limit switch LS2 is switched, relay R4 is energized via this limit switch LS2, and the self-holding of relay R1 is released by opening its B contact "4. At the same time, its A contact RL is opened and the solenoid Since the power to SOL 1 is cut off, solenoid valve 1
1 returns to the neutral position, and atmospheric pressure acts on the vacuum chamber 10.

As a result, the vacuum chamber 10 loses the traction force exerted by the bell crank 9 that holds the spool of the auxiliary mask cylinder 8 in the pushed-in position, and the clutch 2 is operated by its inherent spring force. At this time, the limit switch LSI returns to the open state, stops energizing relay 2, and releases its a contact r2, but relay] (3
is self-held via its a contact ``3'', and the excitation of the solenoid 5QL2 continues. Therefore, the power take-off device 1 is held in the contact position.

Here, when the relay R4 is excited by the contact operation of the power take-off device l, the pilot lamp 1) L3 lights up through its a contact r4, and the operator is informed that the power take-off device r111 is connected. Can be notified.

After this, when the engine E is accelerated, the engine speed sensor L S 3 is opened and the excitation of the relay x2 is cut off, but the a contact x2 is connected to the related relay RI.
As mentioned above, is opened by the contact operation of the power take-off device 1, and increasing the speed of the engine E after the power take-off device 1 is connected has no effect on the connection/disconnection operation of the power take-off device 1. .

In this way, the driven body 3 such as a pump is driven by the contact operation of the power extraction device 1, and an appropriate work can be performed using this driven body 3.

After the work by the driven body 3 is completed, in order to return to the running state,
All you have to do is operate the stop operation switch P132. In this case, relay R4 is energized by the contact operation of power take-off device I, and relay x2 is energized as described above when engine E is in an idling state. Therefore, by operating the stop operation switch PB2, the relay Ql is excited and self-holding via its a contact ql, and at the same time, the solenoid 5OLI is energized.

The energization of this solenoid 5OLI switches the solenoid valve 11 to the lower position, rF] As described above, the vacuum chamber 1
Pipe pressure is applied to the clutch 2 to disengage the clutch 2. Then, the limit switch LSI that detects the disconnection operation is closed and the relay R2 is energized.

Furthermore, relay Q2 is excited by the a contact q1 of the self-held relay Ql and the a contact r2 of the relay R2,
Since the b contact q2 is opened and the excitation of the relay R3 is cut off, the excitation to the solenoid SOL2, which was energized through the a contact r3, is cut off. As a result,
The solenoid valve 15 returns to the neutral position, and the vacuum chamber 14
Since the atmospheric IF is applied to the air, the power extraction device 1 is turned off and the driving of the driven body 3 such as a pump is stopped. At the same time, limit switch LS2 is opened and no longer energizes relay R4, and its a contact r4 is opened to release the self-holding of relay Ql and then to solenoid 5OLI, which was being held through a contact q1 of relay Ql. As a result of the excitation being cut off, the solenoid valve 11 returns to the neutral position and engages the clutch 2. After this, the main switch MS may be opened.

On the other hand, when controlling the connection/disconnection of the power take-off device from the driver's cab side, when the PTO switch PSW installed on the driver's cab side is operated, the power flows to the chassis side PTO circuit via the B contact x4. Activate the take-out device l. In this case, relay x3 is energized and its b contact x3 is opened, so no current flows to relay R4. As a result, the a contact r4 remains open and does not operate even if the starting operation switch FBI on the operation panel side is operated. In this way, the PTO switch PSW on the driver's cab side and the starting operation switch FBI on the operation panel side are mutually interlocked so that if either one is operated, the operation of the other is invalidated. It is.

Although it is assumed that the operation panel will be installed at an appropriate position on the vehicle body depending on the content of the work, it is also possible to move it to the vicinity of the work site via a cable.

Furthermore, it is also possible to replace the control means in this embodiment with a microcomputer or the like.

(Effects of the Invention) As described above, according to the present invention, the clutch is automatically disengaged by simply operating the operation switch from a position away from the driver's cab, and then the power take-off device is engaged or disengaged. This makes it possible to grasp the work details and remotely control driven objects such as pumps, greatly improving work efficiency and reducing worker fatigue.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the present invention, and FIG. 1 is a piping system diagram for controlling the connection and disconnection of the power take-off device and the clutch, FIG. FIG. 3 is a circuit diagram of the power take-off device η and a control means for controlling engagement and disengagement of the clutch.

Claims (4)

[Claims] (1) In a work vehicle in which a driven body such as a pump is driven from the vehicle engine via a power extraction device,
a clutch actuator that connects and disconnects the clutch; a power extraction device actuator that connects and disconnects the power extraction device;
A fluid source for operating these actuators, a solenoid valve disposed in piping connecting the clutch actuator and the fluid source, and the power take-off device actuator and the fluid source, respectively, and arranged at an appropriate position on the vehicle, It consists of an operation panel provided with an operation switch for connecting and disconnecting the power extraction device, and by switching the operation switch, the clutch actuator and the power extraction device actuator are sequentially actuated via the control means, thereby disconnecting the power extraction device. 1. An operation control device for a power take-off device in a work vehicle, characterized in that the device is configured to perform direct control. (2) Operation control of the power take-off device in the work vehicle according to claim 1, wherein the control means is provided with an electric contact for detecting the engaged state of the power take-off device and an electric contact for detecting the disengaged state of the clutch. Device. (3) The operation control device for a power extraction device in a work vehicle according to claim 1, wherein the control means is provided with a pressure sensor that detects a set pressure of the fluid source. (4) The operation control device for a power extraction device in a work vehicle according to claim 1, wherein the control means is provided with an engine rotation speed sensor for detecting a set rotation speed of the engine.