JPH0717813Y2 - Engine start safety device for management machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to an engine start safety device for a management machine, which prevents a sudden start of the management machine and a sudden start of a work machine connected to the management machine when the engine is started. .

2. Description of the Related Art Conventionally, as a power transmission device from an engine to a mission in a management machine having a centrifugal clutch, a centrifugal clutch is provided on a drive pulley connected to the engine, and a centrifugal clutch is provided between the drive pulley and a driven pulley connected to the mission. In general, a belt transmission method in which a belt for power transmission is wound.

In such a management machine, the engine is started with the throttle of the engine being rotated to a position where the engine speed becomes low, and then the throttle is rotated to increase the engine speed, thereby centrifuging. The clutch is connected and power is transmitted from Encidin to the mission.

On the other hand, when stopping the engine in such a management machine, the centrifugal clutch is disengaged by rotating the throttle to lower the engine speed, and then the engine stop switch is turned on. It is common to stop the engine.

The problem to be solved by the invention However, forgetting to rotate the throttle to a position where the engine speed becomes low, and leave the throttle rotated to a position where the engine speed becomes the speed to connect the centrifugal clutch. The engine may be stopped in the state of.

Therefore, if a starting operation is performed to restart the engine from this state, the engine speed will increase at the same time as the engine starts, the centrifugal clutch will be connected, power will be transmitted to the mission, and the management machine will suddenly start. The work machine connected to the control machine suddenly starts and is very dangerous.

A belt for power transmission is wound between a drive pulley connected to an engine and a driven pulley connected to a mission,
In a management machine in which a centrifugal clutch for intermittently transmitting power according to the engine speed is provided on the drive pulley side or the driven pulley side, a throttle is provided at a position where the engine speed is equal to or higher than the speed at which the centrifugal clutch is connected. A detection switch that is turned "on" when the throttle is moving to a position where the engine rotation speed is "off" and the engine rotation speed is less than or equal to the rotation speed for disconnecting the centrifugal clutch, The detection switch was connected between the coil portion of the magnet switch for intermittently energizing the cell motor and the cell start switch.

Action When the engine is stopped while the throttle is moving to a position where the engine speed is equal to or higher than the speed at which the centrifugal clutch is engaged, the detection switch is "off" and the cell start switch is turned on. Even if the engine is operated to start the engine, the coil portion of the magnet switch is not energized. Therefore, since the magnet switch is kept in the "OFF" state, the starter motor is not energized and the engine is not started. On the other hand, when the engine is stopped while the throttle is moving to a position where the engine speed is equal to or lower than the speed at which the centrifugal clutch is disengaged, the detection switch is turned on and the cell start switch When the engine is operated to start the engine, the coil part of the magnet switch is energized, the magnet switch is turned on, and the starter motor is energized to start the engine.

Embodiment An embodiment of the present invention will be described with reference to the drawings. Management machine 1
A cell start type engine 3 is mounted on the front part of the chassis frame 2, and a mission case 4 accommodating a traveling mission (not shown) is fixed to the rear part of the chassis frame 2. A power transmission belt 9 is wound between a drive pulley 6 fixed to an output shaft 5 connected to the engine 3 and a driven pulley 8 fixed to an input shaft 7 connected to the mission, A centrifugal clutch (not shown) is incorporated in the drive pulley 6. In addition,
When the rotation speed of the engine 3 rises above the set rotation speed, the centrifugal clutch is engaged and the output end 5 and the drive pulley 6 rotate integrally.

The engine 3 is rotatably provided with a throttle (not shown) for increasing / decreasing the engine speed by increasing / decreasing the fuel injection amount, and this throttle is rotatable around a support shaft 10. The throttle arm 11 is connected to the throttle arm 11 via the wire 12.
It is linked to 13. The throttle arm 11 is attached to the outer wall portion of the engine 3, and the throttle operating lever 13 is attached to the operator's hand portion of the handle 14 of the management machine 1.

A detection switch 15 for detecting the rotational position of the throttle by detecting the rotational position of the throttle arm 11 is provided on the outer wall of the engine 3. When the throttle is rotated to a position where the engine speed is equal to or higher than the speed at which the centrifugal clutch is engaged, the throttle arm 11 moves the detection switch 15 as shown in FIG. 3 (a). The detection switch 15 is turned "OFF" by entering the recess 16 of the. On the other hand, when the throttle is rotated to a position where the engine speed is equal to or lower than the speed at which the centrifugal clutch is disengaged,
When the throttle arm 11 comes out of the recess 16 of the detection switch 15 as shown in FIG. 3 (b), the detection switch 15 is turned on.

Next, a starter motor for starting the engine 3
17 is connected to the battery 19 via a magnet switch 18. Also, the coil portion of the magnet switch 18
A cell start switch 21 is connected to 20 through the detection switch 15.

In such a configuration, first, engine starting from a state in which the throttle is rotationally operated to a position where the engine speed is equal to or lower than the speed at which the centrifugal clutch is disengaged will be described. In this state, the detection switch 15 is set to the third
It is "on" as shown in FIG. Therefore,
When the cell start switch 21 is operated to the starting position, the coil portion 20 of the magnet switch 18 is energized and the magnet switch 18 is turned on. When the magnet switch 18 is turned on, the starter motor
The electricity is supplied to 17, and the engine 3 is started. In addition,
When the engine 3 is started, the engine speed does not rise to the speed at which the centrifugal clutch is engaged, and power is not transmitted from the engine 3 to the mission.

Next, forgetting to return the throttle control lever 13 to the low speed rotation position, the engine 3 is stopped, and the throttle is operated to rotate from the state where the engine rotation speed is equal to or higher than the rotation speed for connecting the centrifugal clutch. The engine starting operation will be described. In this state, the detection switch
15 is “off” as shown in FIG. 3 (a),
Even if the cell start switch 21 is operated to the starting position, the coil portion 20 of the magnet switch 18 is not energized.
Therefore, the magnet switch 18 is maintained in the "OFF" state, the starter motor 17 is not energized, and the engine 3 is not started. Therefore, even if the cell start switch 17 is operated to the starting position to start the engine 3, the engine 3 is not started, and immediately after the engine 3 is started, the rotation speed of the engine 3 rapidly increases and the centrifugal clutch is engaged. The power transmission to the mission is prevented and the management machine 1 is prevented from suddenly starting.

In the present embodiment, the detection switch 15 is provided on the outer wall of the engine 3 to detect the throttle position by detecting the rotational position of the throttle arm 11, but the detection switch 15 is provided on the handle 14. A structure may be provided in which the throttle position is detected by detecting the rotational position of the throttle operating lever 13.

Effect of the Invention According to the present invention, as described above, when the throttle is moving to a position where the engine speed is equal to or higher than the speed at which the centrifugal clutch is connected, it is turned "off" and the engine speed disconnects the centrifugal clutch. A detection switch that turns on when the throttle moves to a position below the number of revolutions is provided, and the detection switch is connected between the coil part of the magnet switch that intermittently energizes the cell motor and the cell start switch. As a result, when the throttle is moving to a position where the engine speed is equal to or higher than the speed at which the centrifugal clutch is engaged, even if the cell start switch is started because the detection switch is "OFF". Since the coil part of the magnet switch is not energized, the magnet switch is kept in the "off" state. The engine is not started as the starter motor is not energized. Therefore, immediately after starting the engine, the centrifugal clutch is connected to suddenly start the management machine or the work machine connected to the management machine. It is possible to prevent this from occurring, and it is possible to improve the safety when the engine is started.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a wiring diagram, Fig. 2 is a front view of an engine showing a mounting state of a detection switch and a throttle arm, and Fig. 3 is on / off of the detection switch. FIG. 4 is a plan view showing the state, and FIG. 4 is a side view showing the entire management machine. 1 ... Management machine, 3 ... Engine, 6 ... Drive pulley, 8
...... Drive pulley, 9 ...... belt, 15 ...... detection switch,
17 …… cell motor, 18 …… magnet switch, 20 ……
Coil part, 21 ... Cell start switch

Claims (1)

[Scope of utility model registration request] 1. A centrifugal clutch for winding a power transmission belt between a driving pulley connected to an engine and a driven pulley connected to a transmission, and connecting and disconnecting the power transmission in accordance with the number of revolutions of the engine. In the management machine provided on the drive pulley side or the driven pulley side, when the throttle is moving to a position where the engine speed is equal to or higher than the speed at which the centrifugal clutch is connected, the engine speed is turned off and the engine speed is changed. “On” when the throttle is moving to a position below the rotational speed for disconnecting the centrifugal clutch
An engine start safety device for a management machine, characterized in that the detection switch is connected between the coil portion of the magnet switch for intermittently energizing the starter motor and the cell start switch.