JPH0143511Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diesel engine in which a starting motor is started by operating a key switch, and a fuel stop motor is activated via a controller, thereby completing the starting operation.

In this type of known diesel engine, due to failure of the controller, key switch, etc., a disconnection occurs between the fuel stop motor and the power source, making it impossible to start the diesel engine and rendering work impossible. It is also very dangerous when driving on the road (for example, if it breaks down at a railroad crossing, it will be impossible to escape)
There were other drawbacks.

SUMMARY OF THE INVENTION The object of the present invention is to provide an auxiliary power supply circuit for the fuel stop motor in order to eliminate the above-mentioned drawbacks of known diesel engines, thereby making it possible to start the diesel engine even in the event of the above-mentioned failure.

The present invention has a first contact which is an empty contact and is in the normal position, a second contact which is connected to the fuel stop motor and which is in the starting position, and a third contact which is connected to the starting motor electromagnetic switch and which is in the starting motor start position. Then, the fuel stop motor and the starting motor electromagnetic switch are connected to the power source through an emergency switch which automatically returns to the second contact after changing the connection position from the first contact to the second contact to the third contact by switch operation, This constitutes an auxiliary power supply circuit for the fuel stop motor and starting motor.

The present invention will be described below based on embodiments shown in the drawings.

The construction of the engine starting circuit A, which includes a power source E, a fuse F, a key switch 1, a controller 2, a fuel stop motor 3, a starting motor electromagnetic switch 4, etc., is the same as in the conventional device. 5 is a starting motor. Key switch 1 has a stop
STOP contact K ₀₁ , operation IG contact K ₀₂ , start ST contact
A first interlocking contact K ₁₁ of an interlocking switch 6a of an emergency switch 6, which will be described later _, is interposed between the controller 2 and the fuel stop motor 3.

The emergency switch 6, which is the main part of the present invention, is installed near the power source (battery) E, the conductor 7 between the power source E and the emergency switch 6 is shortened, and fuses etc. are omitted to ensure reliability in the event of an emergency. I got it working.

The first contact _K1 of the emergency switch 6 is an empty contact to which nothing can be connected, the second contact _K2 is connected to the fuel stop motor 3, and the third contact _K3 is connected to the starting motor electromagnetic switch 4.

In the embodiment, the emergency switch 6 is a dual switch, and the interlocking switch 6a is connected between the fuel stop motor 3 and the controller 2 as described above, but only the first interlocking contact _K11 is in the effective connection position and is always connected. However, by operating the emergency switch 6, the switch position is changed to the second interlocking contact K ₂₁ and the third interlocking contact K ₃₁ , which are empty contacts.

The emergency switch 6 is normally located at the first contact point _K1 ,
By operating the switch, the second contact K ₂ and then the third contact K ₃
The switch position changes, and when the switch operation is completed, the third contact _K3 automatically returns to the switch position of the second contact _K2 due to the action of the spring.

During driving or work, a failure in the controller 2, key switch 1, etc. (particularly, the controller 2 often fails) causes the fuel stop motor 3 to malfunction.
may stop operating and the diesel engine may stop. In this case, in a vehicle using a crawler as a traveling device, a combine harvester, etc., the vehicle cannot be pushed out and moved, which is extremely dangerous in the event of a breakdown at a railroad crossing or the like.

In such a case, the emergency switch 6 of the emergency engine starting device of the present invention is operated.

The contact of the emergency switch 6 first becomes the second contact _K2 in the starting position, and the power supply E is connected to the fuel stop motor 3 to complete the auxiliary power circuit, and the contact of the interlocking switch 6a is changed to the second contact.
The controller 2, which would have broken the circuit between the controller 2 and the fuel stop motor 3, causing the failure;
Disconnect key switch 1 from the circuit.

Thus, the engine becomes ready to start. In this state, by further moving the emergency switch 6 to the starting motor starting position of the third contact _K3 , the starting motor electromagnetic switch 4 is connected to the power source E via the third contact _K3 , and the starting motor auxiliary power supply circuit is completed and the starting motor starts.

The emergency switch 6 returns to the second contact _K2 when the driver releases the switch, and maintains the auxiliary power circuit of the fuel stop motor 3 in case of failure of the controller 3 or the like.

Therefore, even if the controller 2 or the like breaks down, it is possible to continue driving on the road, working in fields, civil engineering work, etc.

In addition, the emergency switch 6 is connected to the power source (battery) E.
Since it is located near the driver's seat and away from the driver's seat where control levers, switches, etc. are concentrated, there is no need to worry about malfunctions as the operator does not touch it during normal operation.

As mentioned above, the present invention is equipped with an auxiliary power circuit that connects the power source and the fuel stop motor, and the power source and the starting motor electromagnetic switch through the emergency switch. In other types of self-propelled work vehicles, the diesel engine may stop due to a malfunction in the controller that controls the fuel stop motor, making it impossible to drive on the road or work. By completing the auxiliary power supply circuit for the electromagnetic switch, you can continue driving on the road, working, etc., and you can use combine harvesters equipped with diesel engines without worrying about them breaking down at railroad crossings, fields, etc. It has the effect of allowing you to drive.

[Brief explanation of the drawing]

The drawing is an electrical circuit diagram of an emergency engine starting device for a diesel engine, showing an embodiment of the present invention. 3...Fuel stop motor, 4...Starting motor electromagnetic switch, 6...Emergency switch.

Claims (1)

[Scope of utility model registration request] In a diesel engine that starts the engine by putting the fuel stop motor and the starter motor into a activated state through the operation of a key switch and controller, the first contact is in the normal position as an empty contact, the second contact is in the startable position connected to the fuel stop motor, and the third contact is in the starting state. Starting motor Connected to the electromagnetic switch, the starting motor is connected to the starting position, and when the switch is operated, the connection position changes from the first contact to the second contact, and then to the third contact, and when the switch operation is completed, the third contact automatically returns to the second contact. switch,
An emergency engine starting position characterized by a connection between a power source and a fuel stop motor and starting motor electromagnetic switch.