JPH0724620Y2 - Engine starting safety device for mobile agricultural machinery - Google Patents

Description

TECHNICAL FIELD The present invention relates to an engine start safety device for a mobile agricultural machine, which prevents a sudden start of the mobile agricultural machine or a sudden start of a working machine connected to the mobile agricultural machine when the engine is started. .

2. Description of the Related Art Conventionally, a mobile agricultural machine is provided with a starting device for starting the engine, a clutch device for connecting and disconnecting power transmission from the engine to the mission, a shift lever for switching the shift state of the mission, and the like.

Here, at the time of starting the engine of the mobile agricultural machine, the clutch device is switched to the disengaged state, and the starter is operated while the shift lever is operated to the neutral shift position. The mobile agricultural machine is run by switching to the shift position and connecting the clutch device.

In a mobile agricultural machine to which a working machine driven by power from an engine is connected, the engine is started in a state in which a shift lever for switching the shifting state of the working machine is operated to a neutral shift position.

On the other hand, the engine is generally stopped by operating a gear shift lever of a mobile agricultural machine or a gear shift lever of a working machine to a neutral gear shift position, and then turning on an engine stop switch.

However, there are cases where the engine is stopped without operating the shift lever to the neutral shift position and switching the clutch device to the disengaged state.

Therefore, if the starting device is started to restart the engine from this state, power is transmitted to the running wheels of the mobile agricultural machine and the working machine connected to the mobile agricultural machine at the same time when the engine is started, and the mobile agricultural machine is rapidly operated. It is extremely dangerous as it starts and the work equipment starts suddenly.

Means for Solving the Problems A detection switch which is turned “OFF” when a shift lever is operated to a neutral shift position and is “ON” when the shift lever is operated to a shift position other than neutral And a start-time safety circuit in which a relay switch whose coil section is connected to the power generation section of the engine and the detection switch are connected in series, and the start-time safety circuit is connected in parallel with the engine stop switch.

Action If the engine is stopped with the shift lever operated to a shift position other than neutral, the detection switch is turned on.
Then, the relay switch is turned "on", and therefore the starting safety circuit connected in parallel with the engine stop switch is turned "on", so that the engine is not started even if the starting operation is performed. On the other hand, if the engine is stopped while the gearshift lever is operated to the neutral gearshift position, the detection safety switch is in the "off" state, so the startup safety circuit is also in the "off" state, and Engine is started.

Embodiment An embodiment of the present invention will be described with reference to the drawings. An engine 3 is mounted on a front portion of a chassis frame 2 of the mobile agricultural machine 1, and a mission case 4 accommodating a traveling mission (not shown) is fixed to a rear portion 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. The engine 3
When the number of revolutions is increased above the set number of revolutions, the centrifugal clutch is connected, and the output shaft 5 and the drive pulley 6 rotate integrally.

The engine 3 is provided with a throttle (not shown) that increases / decreases the engine speed by increasing / decreasing the fuel supply amount. The throttle is a throttle operating lever 11 attached to the handle 10 of the mobile agricultural machine 1. Is connected via a wire 12.

Next, the mobile agricultural machine 1 is provided with a shift lever 13 for switching the shift state in the mission. As shown in FIG. 2, the speed change lever 13 is rotatably held in a change holder 14 having a substantially vertical axis, and the change holder 14 is supported by a horizontal axis. It is provided so as to be rotatable around the shaft 15 in the front-rear direction. In addition, the shift lever 13 includes a shift lever.
The instruction pin 18 that moves in the guide groove 17 formed in the change guide 16 in response to the gear shifting operation of the shift guide 13 and the shift pin shafts 19 and 20 that selectively engage with the gear shift operation of the gear shifting lever 13 A change arm 21 that selectively slides the shifter shafts 19 and 20 is fixed. A spring 22 is attached to the speed change lever 13 to urge the speed change lever 13 around the support shaft 15 in the clockwise direction.

Next, in the mobile agricultural machine 1, the change arm 21 is operated when the speed change lever 13 is operated to the neutral speed change position.
When the gear shift lever 13 is operated to a shift position other than neutral, the contact state with the rear end of the change arm 21 is released. A detection switch 23 that turns on is provided. Here, there is provided an earth circuit 25, which is a starting safety circuit in which a relay switch 24 whose coil section is connected to the power generation section of the engine 3 and the detection switch 23 are connected in series. , Is connected in parallel with an engine stop switch 26 for stopping the engine 3.

In such a configuration, first, engine starting from a state in which the shift lever 13 is operated to the neutral shift position will be described. When the speed change lever 13 is operated to the neutral speed change position, the speed change lever 13 is rotatable in the front-rear direction around the support shaft 15, and when the hand is released from the speed change lever 13, The urging force causes it to rotate rearward, and the rear end of the change arm 21 comes into contact with the detection switch 23 to turn off the detection switch 23. Therefore, the earth circuit 25 is in the “off” state, and
Before starting the engine 3, the engine stop switch 26 is also turned off. Therefore, the engine 3 is started by starting a starting device (not shown) to start the engine 3.

Here, since the engine 3 is started while the throttle operating lever 11 is being operated at a position where the engine speed becomes high, the engine speed increases immediately after the engine 3 starts and the centrifugal clutch is connected. Even if power is transmitted from the engine 3 to the mission, the mobile agricultural machine 1 is prevented from suddenly starting because the speed change lever 13 is located at the neutral speed change position.

After the engine 3 is started, even if the detection switch 23 is turned "on" by operating the shift lever 13 to a shift position other than the neutral position, the power is supplied from the power generation part of the engine 3 to the coil part of the relay switch 24. Is done relay switch 24
Is "off", the ground circuit 25 is maintained in the "off" state, and the operation of the engine 3 is continued.

Next, engine starting from a state in which the shift lever 13 is operated to a shift position other than neutral will be described. Shift lever
In a state where 13 is operated to a shift position other than neutral, the change arm 21 separates from the detection switch 23, so that the detection switch 23 is “ON”.
Since the engine 3 is not started yet, the relay switch 24 is also "on". Therefore, the earth circuit 25 is turned on, and the engine 3 is not started even if the starting device is started to start the engine 3. Therefore, immediately after the engine 3 is started, the centrifugal clutch is connected and the mobile agricultural machine 1 is prevented from suddenly starting.

Effect of the Invention The present invention is turned off when the shift lever is operated to the neutral shift position as described above, and is turned on when the shift lever is operated to a shift position other than the neutral shift position. The detection switch and the coil switch are connected in series with the relay switch connected to the power generation part of the engine to provide a starting safety circuit, and by connecting this starting safety circuit in parallel with the engine stop switch, If you try to start the engine from a gear position other than neutral, both the detection switch and the relay switch will be turned on, and the safety circuit at startup will be turned on and the engine stop switch will be turned on. This is the same state as when operated, and it is possible to prevent the engine from starting. Therefore, immediately after the engine starts, the mobile agricultural machine suddenly starts up or moves. It is possible to prevent the working machine connected to the vehicle from being suddenly started, and to improve the safety at the time of engine starting.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a wiring diagram, Fig. 2 is a vertical sectional side view showing a gear shift operating portion, Fig. 3 is a plan view thereof, and Fig. 4 is a gear shift lever and a detection switch. And FIG. 5 is a side view showing the whole mobile agricultural machine, showing a state of attachment with and. 3 …… Engine, 13 …… Shift lever, 24 …… Relay switch, 25 …… Starting safety circuit, 26 …… Engine stop switch

Claims (1)

[Scope of utility model registration request] 1. A detection switch is provided which is turned "OFF" when the shift lever is operated to a neutral shift position and is turned "ON" when the shift lever is operated to a shift position other than neutral. A starting safety circuit in which a relay switch whose coil section is connected to an engine power generation section and the detection switch are connected in series is provided, and the starting safety circuit is connected in parallel with an engine stop switch. An engine start safety device for mobile agricultural machinery.