JPH038497Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is a PTO attached to a vehicle engine.
This invention relates to a PTO coupling device for coupling a power take off (power take off) to an engine.

[Prior Art] Conventionally, PTO devices have been provided for vehicles such as trucks that divert the driving force of the engine to a crane or the like.

The device that connects the drive system of the vehicle driven by the engine to the PTO device is configured in substantially the same way as the circuit and equipment shown in the attached drawings, but without the alarm circuit LB.

[Problem that the invention attempts to solve]

When such a conventional coupling device is used, the following phenomenon occurs.

In other words, if the lamp 16 of the PTO switch 10 is small and difficult to see, or if you carelessly do not check whether the lamp 16 is lit or not, it is possible to depress the clutch to change gears etc. without checking whether the PTO switch 10 is ON or OFF. ,
When clutch switch 11 is turned on, the PTO
If the switch 10 has been turned ON by mistake, the 3-way magnetic valve 6
And the air cylinder 5 will operate.

Therefore, there is a problem in that the output of the transmission 4 is transferred to the PTO output shaft 1 even though there is no intention to operate the PTO device.

The present invention aims to solve these problems, and is designed to prevent people from operating the PTO switch by mistake.
A buzzer will sound an alarm when there is a possibility of the PTO device being connected and activated.
The purpose is to provide a PTO coupling device.

[Means for solving problems]

For this reason, the PTO coupling device of the present invention is designed to connect a PTO output shaft with a drive gear attached to a transmission to extract the driving force generated by the engine to a source other than the vehicle's drive system, and the output of the transmission. a connecting gear that is slidably attached to a shaft and can mesh with the driving gear of the PTO output shaft; and a connecting gear moving mechanism that engages and disengages the connecting gear and the driving gear by moving the connecting gear. Equipped with the same connected gear movement mechanism,
a fluid actuator that moves the connecting gear along the output shaft of the transmission; a fluid pressure source that supplies working fluid pressure to the actuator; and a fluid pressure source that is interposed between the fluid pressure source and the actuator. Controlling actuator operation 3
a three-way magnetic valve, an operating current supply circuit that supplies operating current to the three-way magnetic valve, a clutch interlocking switch that is turned on in conjunction with the engagement and release of the clutch in the drive system of the vehicle, and A hold circuit branched from the current supply circuit and connected to the 3-way magnetic valve in order to maintain the operating state of the 3-way magnetic valve when energized is connected to the 3-way magnetic valve; 3 above
A PTO operation detection switch that turns on in conjunction with the operation of the fluid actuator due to the operation of the way magnetic valve, and an intervening device between the clutch interlocking switch and the three-way magnetic valve in the operation current supply circuit. and a PTO switch interposed between the PTO operation detection switch in the hold circuit and the 3-way magnetic valve to simultaneously open and close the operating current supply circuit and the hold circuit, In order to issue an alarm in the event of erroneous operation of the PTO switch, the above-mentioned hold circuit is connected between the circuit section from the clutch interlocking switch to the PTO switch in the above-mentioned operating current supply circuit and the circuit section on the power supply side from the above-mentioned PTO operation detection switch in the above-mentioned hold circuit. The present invention is characterized in that an alarm circuit is provided, which includes a diode that allows only current to flow from the circuit portion of the circuit to the circuit portion of the operating current supply circuit, and a buzzer connected in series with the diode.

[Effect]

With the configuration described above, if the clutch pedal is depressed and the PTO switch is turned on before the clutch in the drive system is released, the buzzer will sound an alarm.

〔Example〕

Hereinafter, an embodiment of the present invention will be explained with reference to drawings.The attached drawing shows an embodiment of the present invention.
FIG. 2 is an overall configuration diagram showing a PTO coupling device.

As shown in the figure, a coupling gear 3 is attached to a propeller shaft 2 serving as an output shaft of a transmission 4 coupled to an engine in a vehicle.

The connecting gear 3 is attached to the propeller shaft 2 so as to be able to slide in the axial direction, and when it moves, it meshes with the drive gear 1a of the PTO output shaft 1 disposed near the connecting gear 3. It's getting old.

An air cylinder 5 is installed near the propeller shaft 2 and the connecting gear 3, and the tip of a lever 5b fixed to a rod 5a of the air cylinder 5 engages with the connecting gear 3.

That is, the movement of the rod 5a and the lever 5b due to the operation of the air cylinder 5 causes the connection gear 3 to move.
is driven, and the connecting gear 3 and the driving gear 1a mesh with each other, so that the propeller shaft 2 and the PTO
The output shaft 1 is connected to the output shaft 1.

The air cylinder 5 is connected to an output port 6a of a three-way magnetic valve 6, and when the three-way magnetic valve 6 is activated and the plunger 6d is driven in one direction, the air cylinder 5 is connected to an input port 6c connected to an air tank 7. Air pressure as working fluid pressure is inputted to the air cylinder 5 from this point.

The plunger 6d in the three-way magnetic valve 6 is driven by a coil 6e, and when the coil 6e is energized, the plunger 6d is driven and the input port 6c is driven.
and the output port 6a, and when the coil 6e is de-energized, the plunger 6d is driven in the opposite direction by the return spring of the air cylinder 5, and the exhaust port 6 is connected.
B is designed to be more exhausted. coil 6e
has one end connected to the L terminal of the PTO switch 10, and the other end grounded.

The B terminal of the PTO switch 10 is connected to an operating power source via a power relay 12 and a fuse 13, which have a built-in clutch interlocking switch 12a, and when the clutch interlocking switch 12a in the power relay 12 is turned on,
0 is in the ON state, current is supplied from the current source to the coil 6e through the power relay 12 and the B and L terminals of the PTO switch 10.

Clutch interlock switch 12 of power relay 12
a is normally connected to the terminal 12b, and the terminal 12
b is connected to the exhaust brake circuit.

Then, when the coil 12d of the power relay 12 is energized, the clutch interlocking switch 12a is switched to the terminal 1.
2c, the coil 12
When the clutch switch 11 is turned on, current is supplied to d so that it is excited.

That is, the clutch switch 11 is configured to be turned ON when the driver depresses the clutch pedal, and current is supplied to the operating current supply circuit L in conjunction with the clutch release in the vehicle drive system and the ON operation of the PTO switch 10. flows, the three-way magnetic valve 6 and the air cylinder 5 operate, and the connecting gear 3 and the PTO output shaft 1 are connected.

In this way, the operating current supply circuit L that supplies the initial operating current of the three-way magnetic valve 6 includes the fuse 13, the power relay 12, the circuit portion L ₁ ,
It is composed of a PTO switch 10, a circuit section _L2 , a coil 6e, and a circuit section _L3 .

On the other hand, a hold circuit HL is branched from between the fuse 13 of the operating current supply circuit L and the power relay 12.

The hold circuit HL is composed of a circuit portion HL', a PTO operation detection switch 8, a circuit portion HL ₂ , a resistor 15, a diode 14, and a circuit portion HL ₃ .

The PTO operation detection switch 8 is connected to the air cylinder 5
Due to the movement of the rod 5a in the PTO operation detection switch 8, the rod 8a inside the PTO operation detection switch 8 is displaced and the circuit section is
HL ₁ and circuit part HL ₂ are connected, and when the PTO operation detection switch 8 is in the ON state, the hold circuit HL is connected to the B of the PTO switch 10.
The circuit that goes through the terminal and L terminal to circuit portion L ₂ , coil 6e and circuit portion L ₃ is closed, and coil 6e
It is designed to maintain the excited state of.

Note that the PTO switch 10 is attached to the meter hood of the vehicle. In this meter hood,
A lamp 16 is provided to indicate the PTO connection, and is supplied with current by a circuit branching off from the circuit section HL ₂ and is illuminated.

An alarm circuit LB is provided between the circuit portion _L1 of the operating current supply circuit L and the circuit portion _HL1 of the hold circuit HL.

Alarm circuit LB extends from circuit part HL ₁ to circuit part L ₁
It is composed of a diode 18 that only allows current to flow into the diode 18, and a buzzer 17 connected in series to the diode 18.

As a result, when the PTO switch 10 is turned on before the clutch switch 11 is turned on, current flows from the circuit portion HL ₁ via the alarm circuit LB and through the circuit portions L ₁ , L ₂ , and L ₃ , causing the buzzer to be activated. 1
7 is set to sound an alarm.

A PTO coupling device as an embodiment of the present invention is as follows:
Since the configuration is as described above, when driving other equipment such as a crane using the PTO output, first depress the clutch (release the clutch connection of the drive system) and turn the clutch switch 11 to the ON state. and turn on the PTO switch 10 attached to the vehicle's meter hood.

As a result, the relay circuit R becomes a closed circuit, the coil 12d is excited, and the clutch interlocking switch 12a is switched to the terminal 12c side.

Then, the operating current supply circuit L consisting of the circuit portions L ₁ , L ₂ , and L ₃ becomes a closed circuit, and the initial operating current of the three-way magnetic valve 6 flows through the operating current supply circuit L. In the three-way magnetic valve 6, the coil 6e is excited and the plunger 6d is driven, the input port 6c and the output port 6a are brought into communication, and working fluid pressure is supplied from the air tank 7 into the air cylinder 5. be done.

In the air cylinder 5, the rod 5a is driven to the right in the figure by the working fluid pressure from the air tank 7, and the connecting gear 3 moves to mesh with the drive gear 1a.

This connects the propeller shaft 2 and the PTO output shaft 1.

At the same time, the rod 8a inside the PTO operation detection switch 8 is moved by the movement of the rod 5a to the right in the figure.
rides on the thick part of rod 5a, and rod 8a
is driven upwards into circuit portion HL ₁ and circuit portion HL ₂
is connected.

As a result, from the circuit portions HL ₁ , HL ₂ , the diode 14 , and the circuit portion HL ₃ to the B
terminal, L terminal, circuit part L ₂ , coil 6
e. The circuit leading to circuit portion _L3 is closed, and the holding current for the three-way magnetic valve 6 flows.

After this, the driver's depression of the clutch pedal is released, and the clutch switch 11 is turned on.
It becomes OFF state.

As a result, the operating current supply circuit L becomes open, and the supply of the initial operating current to the three-way magnetic valve 6 is stopped.

Note that at this time, the lamp 16 is lit.

The output of the engine is then transmitted to the PTO output shaft 1 via the propeller shaft 2 of the transmission 4.

When stopping the PTO output from the PTO output shaft 1, the PTO switch 10 is turned OFF.

As a result, the hold circuit HL is opened and the supply of hold current to the three-way magnetic valve 6 is stopped.

Since the plunger 6d is no longer held in the 3-way magnetic valve 6, the air cylinder 5
, the rod 5a is driven to the left in the figure by the return spring, the connection state of the PTO output shaft 1 is released, and the working air in the air cylinder 5 is transferred to the exhaust port 6.
It is discharged through b.

By the way, if there is no intention to operate the PTO device, that is, if the PTO switch 10 is turned on before the clutch pedal is depressed and the clutch switch 11 is turned on, an alarm will be sent from circuit part HL ₁ of the hold circuit HL. Current flows through the circuit portions L ₁ , L ₂ , L ₃ of the operating current supply circuit L via the circuit LB.

This causes the buzzer 17 to issue an alarm, informing that the PTO switch 10 has malfunctioned.

In addition, after depressing the clutch pedal and turning on clutch switch 11, PTO switch 1
0 is in the ON state, the operating current supply circuit L and hold circuit HL
Current flows through each, and both ends of the alarm circuit LB have the same potential, so no current flows through the alarm circuit LB, and the buzzer 17 does not issue an alarm.

[Effect of idea]

As described in detail above, according to the PTO coupling device of the present invention, in a vehicle, a PTO output shaft with a drive gear attached to the transmission to extract the driving force generated by the engine to a source other than the drive system of the vehicle; a connecting gear that is slidably attached to the output shaft of the transmission and can mesh with the driving gear of the PTO output shaft; and movement of the connecting gear causes the connecting gear and the driving gear to engage and disengage. a hydraulic actuator for moving the connecting gear along the output shaft of the transmission; and a fluid pressure source for supplying working fluid pressure to the actuator. a 3-way magnetic valve that is interposed between the fluid pressure source and the actuator and controls the operation of the actuator;
An operating current supply circuit that supplies an operating current to the way magnet valve, a clutch interlocking switch that turns on in conjunction with the connection and release of the clutch in the drive system of the vehicle, and a clutch interlocking switch that is branched from the operating current supply circuit and is the same. a hold circuit provided in parallel with the circuit and connected to the three-way magnetic valve to maintain the operating state of the three-way magnetic valve when energized; and a hold circuit interposed in the hold circuit to hold the three-way magnetic valve. a PTO operation detection switch that transitions to an on state in conjunction with the operation of the fluid actuator due to the operation of the PTO operation detection switch;
It is interposed between the clutch interlocking switch and the three-way magnetic valve in the operating current supply circuit, and is interposed between the PTO operation detection switch and the three-way magnetic valve in the hold circuit. Simultaneously open and close the above operating current supply circuit and hold circuit.
In order to issue an alarm in the event of erroneous operation of the PTO switch, the circuit section from the clutch interlocking switch in the operating current supply circuit to the PTO switch and the circuit section from the PTO operation detection switch in the hold circuit to the power supply side An alarm circuit consisting of a diode that allows current to flow only from the circuit part of the hold circuit to the circuit part of the operating current supply circuit and a buzzer connected in series with the diode is provided between the circuit part and the circuit part. This simple configuration allows an alarm to be issued in the event of a erroneous operation of the PTO switch, which has the advantage of preventing erroneous operation of the PTO device.

[Brief explanation of drawings]

The figure is an overall configuration diagram showing a PTO coupling device as an embodiment of the present invention. 1...PTO output shaft, 1a...drive gear, 2...
...Propeller shaft, 3...Connection gear, 4...Transmission, 5...Air cylinder as actuator, 5a...Rod, 5b...Lever, 6...3-way magnetic valve, 6a...
Output port, 6b...exhaust port, 6c...input port, 6d...plunger, 6e...coil,
7... Air tank as a fluid pressure source, 8...
PTO operation detection switch, 8a...rod, 10
...PTO switch, 11...Clutch switch,
12...Power relay, 12a...Clutch interlocking switch, 12b, 12c...Terminal, 12d...
Coil, 12e...Diode, 13...Fuse, 14...Diode, 16...Lamp, 17
... Buzzer, 18 ... Diode, L ... Operating current supply circuit, L ₁ , L ₂ , L ₃ ... Circuit part, HL ...
Hold circuit, HL ₁ , HL ₂ , HL ₃ ... circuit part,
LB...Alarm circuit, M...Connection gear movement mechanism, R
...Relay circuit.

Claims (1)

[Scope of utility model registration request] In a vehicle, a PTO output shaft with a drive gear attached to a transmission is used to extract the driving force generated by the engine to a source other than the vehicle's drive system;
a connecting gear that is slidably attached to the output shaft of the transmission and can mesh with the driving gear of the PTO output shaft; and movement of the connecting gear causes the connecting gear and the driving gear to engage and disengage. a hydraulic actuator for moving the connecting gear along the output shaft of the transmission; and a fluid pressure source for supplying working fluid pressure to the actuator. a three-way magnetic valve interposed between the fluid pressure source and the actuator to control the operation of the actuator; an operating current supply circuit for supplying an operating current to the three-way magnetic valve; A clutch interlocking switch which is turned on in conjunction with the connection and release of the clutch in the drive system, and a clutch interlocking switch which is branched from the operating current supply circuit and is provided in parallel with the same circuit and controls the operating state of the three-way magnetic valve when energized. a hold circuit connected to the 3-way magnetic valve to hold the valve; and a PTO that is connected to the hold circuit and turns on in conjunction with the operation of the fluid actuator caused by the operation of the 3-way magnetic valve. An operation detection switch is interposed between the clutch interlocking switch and the 3-way magnetic valve in the operation current supply circuit, and
A PTO that is interposed between the PTO operation detection switch and the above 3-way magnetic valve and opens and closes the above operating current supply circuit and hold circuit at the same time.
from the clutch interlocking switch in the operating current supply circuit to issue an alarm in the event of erroneous operation of the PTO switch.
Between the circuit part leading to the PTO switch and the circuit part on the power supply side of the PTO operation detection switch in the hold circuit, there is a diode that allows only current to flow from the circuit part of the hold circuit to the circuit part of the operating current supply circuit. and a buzzer connected in series with the diode.