JPS5815328B2 - Vehicles equipped with electric start engines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle such as a tractor equipped with an electrically started engine, and is intended to improve a safety device provided to prevent the vehicle from jumping out when the engine is started.

This type of conventional safety device is constructed by interposing a safety switch in series with the engine starting circuit, which is closed when the clutch pedal is depressed.

Therefore, if the safety switch were to fail and remain closed, there was a risk that the vehicle would jump out at the same time as the engine started.

Particularly in tractors, the clutch pedal is exposed to the outside, and the safety switch that is operated by the clutch pedal is often contaminated with muddy water, dust, etc., making it easy to break down and cause the above-mentioned problems.

This invention solves the above problems and improves the reliability of the safety device, and at the same time automatically prevents the vehicle from jumping out when starting the engine by simply operating the start switch without operating the clutch pedal etc. To provide a vehicle capable of emergency escape using a starting motor as a driving source.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram of an electric starting device for an engine in a tractor including a safety device. In the figure, 1 is an engine, 2 is a main clutch, 3 is a transmission, 4 is a clutch pedal (power transmission device), and 5 is an accelerator lever. 16 is a battery, and 7 is a starting motor.

8 is the starting circuit, which includes the battery 6 and the main switch 9.
, starting switch 10, safety switch 11, starting motor 7
It consists of a control circuit configured by connecting the safety release switch 13b in parallel with the safety switch 11, and a drive power supply circuit directly connecting the battery 6 and the starting motor 7.

The safety switch 11 is opened and closed in conjunction with the depression of the clutch pedal 4, and closes the circuit only when the clutch pedal 4 is depressed.

12 is a safety circuit, which connects the start switch 10,
A control circuit configured by sequentially connecting the drive release switch 13a and the solenoid 14 mounted between the fixed body of the tractor and the clutch pedal 4, and a drive power circuit that directly connects the battery 6 and the solenoid 14. Become.

The above-mentioned drive release switch 13a and safety release switch 13
As shown in FIG. 2, the switches 1 and 2b are collectively configured as a single switch 13 so as to be able to interlock with each other.

As shown in FIG. 1, this switch 13 is mounted on a fixed body with its operated portion facing an operating protrusion 5a provided at the swinging base end of the accelerator lever 5.

The drive release switch 13a and the safety release switch 13b are set to the second position when the accelerator lever 5 is moved from the engine operation range to the engine stop position S shown by the chain line in FIG.
The drive release switch 13 is operated to switch from the state shown in the figure.
a is switched from closed to open, and safety release switch 13b is switched from open to closed.

Fig. 3 shows the details of the starting switch 10. 1 This shows the safety circuit terminal 10b and the starting circuit terminal 10c in order from the contact 10a in the neutral position to the clockwise rotation side.
, and a glow circuit terminal 10d is arranged on the counterclockwise rotating side.

The contactor 10a is configured to be able to automatically return from the terminal 10c position to the terminal 10b position and from the terminal 10d position to the neutral position, and is self-retained only at the terminal 10b position.

Reference numeral 15 in the figure indicates a change lever provided on the transmission 3.

According to the above configuration, simply by operating the start switch 10 to start the engine 1, the engine 1 is started while automatically preventing the tractor from jumping out.

That is, when the start switch 10 is operated, the contact 10
A first contacts the terminal 10b and energizes the safety circuit 12.

At this time, since the accelerator lever 5 is in the operating range, the drive release switch 13a is in a state where the circuit is closed as shown in FIG.

As a result, power is supplied to the control circuit of the safety circuit 12, the magnetic switch inside the solenoid 14 is operated, the drive power circuit is closed, the solenoid 14 is driven, and the clutch pedal 4 is pulled toward the depression side. As a result, the main clutch 2 is held in a disconnected state.

When the starting switch 10 is further rotated in the same direction as described above, the contact 10a contacts the terminal 10c while maintaining the connection state with the terminal 10b.

At this time, the safety switch 11 in the starting circuit 8 is operated by the clutch pedal 4 to close the circuit, so power is supplied to the starting motor 7, and the magnetic switch inside the motor 7 is activated to drive the motor. The power supply circuit is closed, the starting motor 7 is activated, and the engine 1 is started.

At this time, the main clutch 2 is in a disconnected state, so the tractor does not jump out.

After starting the engine, by releasing the operating knob of the starting switch 10, the contact 10a automatically returns to the terminal 10b position and the power to the starting circuit is cut off.

At this time, the safety circuit 12 is still energized, so
The operator is free to leave the tractor.

With regard to the engine starting described above, even if the safety switch 11 fails, the tractor will not jump out (G).

That is, if the safety switch 11 fails while it is normally closed, there is a risk of it jumping out, but since power is supplied to the safety circuit 12 before power is supplied to the starting circuit 8, the starting motor 7 is not driven. This is because before the clutch pedal 4 is driven by the solenoid 14, the main switch 2 is shifted to the disconnected state.

In addition, if the solenoid 14 cannot operate, the safety switch 1 can be activated by manually depressing the clutch pedal 4.
1 is closed, the engine is started with the main clutch 2 in a disconnected state, and jump-out is prevented.

In the case of an emergency where the engine 1 stops at a railroad crossing or an intersection and cannot be easily started, an emergency escape is performed by operating the switch 13 using the accelerator lever 5.

That is, when the accelerator lever 5 is returned to the engine stop position S, its operation protrusion 5a operates the switch 13, and the drive release switch 13a is changed from the state shown in FIG. 2 to the open position.
Switch the safety release switch 13b to the closed position.

As a result, the safety circuit 12 is opened, and the starting circuit 8 is opened.
is closed at the drive release switch 13a.

When the start switch 10 is operated to start from this state, the solenoid 14 remains inactive, in other words, the clutch pedal 4
is in the inoperative state, the main clutch 2 remains connected, and the safety switch 11 is in the open state, power is supplied to the starting motor 7 via the safety release switch 13b,
The power of the motor 7 is transmitted to the drive wheels via the main clutch 2 and transmission 3, and emergency escape is performed.

In the above embodiment, the clutch pedal 4 is shown as the power intermittent device, but in addition to this, the change lever 15 is also used.
In a vehicle equipped with an electromagnetic clutch, a hydraulic clutch, or a hydraulic transmission, an electromagnetically driven switching valve or the like may be provided in the middle of the control oil path.

Further, as a modification, it is possible to link the switch 13 to the engine stop lever and to separate the safety circuit 12 from the starting circuit 8 and form it independently.

In the latter modification, the starting switch 10 may be configured in two stages like the switch 13 shown in FIG.

In short, it is sufficient that power is supplied to the safety circuit 12 prior to the starting circuit 8 when the starting switch 10 is operated to start.

Further, the actuator 14 and the safety switch 11 may be operated in association with different power interrupting devices 4, respectively.

Since the present invention is constructed and operated as described above, it produces the following effects.

(a) To start the engine 1, the actuator 14 is driven to shut off the power interrupter 4 prior to the starting circuit 8 being supplied with power by the closing operation of the starting switch 10, and the closing operation is performed by this shutting operation. This is done by closing the starting circuit 8 with the safety switch 11, and then starting the starting motor 7.

Therefore, if a failure occurs while the safety switch 11 is closed, there is a risk that the starting motor 7 will be started immediately by closing the starting switch 10. Since the power interrupter 4 is cut off, the vehicle is reliably prevented from jumping out.

In addition, if the actuator 14 fails, power will not be supplied to the starting circuit 8 unless the safety switch 11 is closed by manually shutting off the power interrupting device 4. There are no vehicles jumping out.

That is, since the safety switch 11 and the actuator 14 are used to prevent the vehicle body from jumping out when the engine is started,
Even if one of them breaks down, the other will reliably prevent the vehicle body from jumping out.

(When starting the engine, simply press the start switch 10
Just by closing the switch, the actuator 14 automatically cuts off the power of the power interrupter 4 prior to driving the starting motor 7, and dynamically prevents the vehicle from jumping out of the power shaft. This eliminates the trouble of depressing the clutch pedal every time the engine is started, as in the case of , and it becomes possible to start the engine with a simpler operation while preventing the vehicle from jumping out.

Since this starting operation is similar to the starting operation of a vehicle not equipped with a safety device, anyone can easily start the engine in a safe state.

G/→ The safety release switch 13b and drive release switch 13a interposed in the starting circuit 8 and the safety circuit 12, respectively, are activated by operating the engine operation control operating tool 5 to the engine stop operation side, and the safety switch 11 is activated, respectively.
Since the actuator 14 is deactivated, even in an emergency situation where the engine 1 stops at a railroad crossing and cannot be easily started, the starting motor 7 can be operated while the power interrupter 4 remains in a state where power can be transmitted. can be driven, making emergency escape possible.

) Furthermore, both of the release switches 13a and 13b are
Both release switches 13a, 13 are activated only when the engine operation control operating tool 5 is operated to stop the engine, and when starting the engine 1, the operating tool 5 is always operated to the operating range.
This eliminates the problem of forgetting to perform the return operation (b), and reliably prevents the vehicle from jumping out.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an electric starting device for an engine in a tractor showing an embodiment of the present invention, FIG. 2 is a wiring diagram of a release switch, and FIG. 3 is a wiring diagram of a starting switch. 1...Engine, 2...Main clutch, 5...Transmission, 4...
・Clutch pedal (power intermittent device), 5... Accelerator lever (engine operation control tool), 7...
...Starting motor, 8...Starting circuit, 9...
...Main switch, 10...Start switch,
11... Safety switch, 12... Safety switch
Foot circuit, 13a...Drive release switch, 1
3b... Safety release switch, 14...
Solenoid (electrical actuator).

Claims (1)

[Claims] 1 A safety switch 11 and a safety release switch 13b connected in parallel are interposed in the starting circuit 8 of the engine 1, and the safety switch 11 is a power intermittent device provided in the power transmission system from the engine 1 to the drive wheels. The safety release switch 13b is configured to be able to operate in conjunction with the power disconnection device 4 so that it is in the closed state only when the engine operation control device 5 is in the disconnected state, and the safety release switch 13b is configured to be in the closed state only when the engine operation control device 5 is in the engine stop operation position. The power intermittent device 4 is configured to be operable in relation to the operation control operating tool 5 so as to be in the closed state, and the power intermittent device 4 is configured to be operable in the power cutoff state by the electric actuator 14, and the drive circuit 12 of the electric actuator 14 A drive release switch 13a is provided therein, and the release switch 13a is configured to be able to operate in conjunction with the engine operation control tool 5 so as to be in an open state only when the engine operation control tool 5 is in the engine stop operation position. Equipped with an electrically started engine characterized in that the operation switch of the actuator 14 is configured to be operable in conjunction with the starting switch 10 so that it is closed prior to the closing operation of the starting switch 10 of the starting circuit 8. Vehicle.