JPS6039459Y2 - Diesel engine starting device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a diesel engine starting device for electrically remotely controlling the starting of an automobile diesel engine.

As is well known, in a diesel engine, the control rack of the fuel injection pump is moved from the stop position to the starting position when starting, then from the starting position to the operating position, and when stopping, the control rack is moved from the starting position to the stopped position, respectively. It is necessary to stop the engine reliably depending on the operating position of the switch (starting switch).

Normally, the control rack is driven by a reversible DC motor, but simply opening the motor circuit at each position of the control rack makes it difficult to accurately stop the control rack at a desired position due to the inertia of the motor rotor.

Further, normally, the contacts of the key switch installed in a diesel automobile are not connected to an external circuit when the key switch is in the stopped position.

Furthermore, there is an operating position between the stop position and the start position.
If the control rack is stopped in this operating position when starting the engine, there is a disadvantage that starting will be inconvenient.

This idea was made to eliminate the above drawbacks.
To provide a simple and inexpensive diesel engine starting device which can be freely installed in a diesel automobile equipped with a normal key switch and which is reliable in operation.

Hereinafter, this invention will be explained in detail with reference to the drawings showing one embodiment thereof.

In FIG. 1, 1 is a reversible DC motor, and the output shaft of this motor 1 is coupled to a worm 2.

A worm gear 3 meshes with the worm 2.

A pinion 5 is attached coaxially with the worm gear 3, and the pinion 5 meshes with the rack 4.

A push/pull wire 6 is fixed to one end of the rack 4, and the other end of this push/pull wire 6 is as shown in FIG.
It is connected to the lever 7 of the control rack of the fuel injection pump of the diesel engine.

Since the lever 7 needs to move more or less freely during operation due to the operation of the governor, the necessary elongated play is provided at the connecting end, as indicated by 8.

Thus, when the motor 1 rotates, the worm 2 rotates, and the worm gear 3 and pinion 5 rotate, so the rack 4 moves forward or backward, and the swinging of the lever 7 controls the fuel injection pump.

91.9□? 93? 94 is the insulator 1 on the rack 4
The insulator 10 is an electrically conductive sliding piece attached to the rack 4 through screws 13.

Reference numeral 11 is a current collector, and the lid 14 (second
(Fig.), and depending on the movement position of the sliding pieces 91 to 9, the contacts 11at llb, IIC? 1l
dt 1let llf selectively moves the sliding pieces 91 to 9. come into contact with.

For example, as shown in FIG. 3, at position A (stopped) of the rack 4 corresponding to the fuel stop position of the control rack, the current collector contacts 11a, llb, and llf do not contact each other, and the contact 11
c, lld is the sliding piece 9. The contact 11e contacts the sliding piece 91.

In addition, in position B (operating) of the rack 4 corresponding to the operating position of the control rack, the contacts 11a and llb are connected to the sliding piece 9.
3, contacts 11c and llf do not contact, and contact 11
d and 11e are sliding pieces 9. come into contact with.

Further, at position C (start) of the rack 4 corresponding to the starting position of the control rack, the contacts 11a and llc do not contact, and the contacts 11b and lld are connected to the sliding piece 9. contact 1
1e and llf come into contact with the sliding piece 9□.

FIG. 3 shows the electrical connections of the collector contacts 11a to 11f1 relays 15, 16 and the key switch 19.

As shown in the figure, the contact 11a is commonly connected to the contact 11c, and the fixed contact 15-1a of the relay 15, the fixed contact 15
-3b and one terminal of the DC motor 1, the contact 11b is connected to the fixed contact 16b of the relay 16, the contact 11d is connected to the fixed contact 16a of the relay 16, and the contact 11e is connected to the movable contact 15 of the relay 15. -3c
The contact 11f is connected to the other terminal of the motor 1, the fixed contact 15-1a of the relay 15, and the movable contact 15-2.
c.

A movable contact 15-1c of the relay 15 is connected to the positive side of the power source and a movable contact of the key switch 19, and a fixed contact 15-2a of the relay 15 is connected to a movable contact 16c of the relay 16.

Contact A (stop position) of key switch 19 is unconnected, contact B (operating position) is grounded via coil 18 of relay 16, and contact C (start position) is grounded via coil 17 of relay 15. has been done.

Further, the sliding piece 9□ is grounded. When relays 15 and 16 are energized, movable contact 15 1aw
15 2cv 15 3c and 16C are fixed contacts 1
Fixed contacts 15-1a, 15-1b, 15-2b, 15-3b and 16b are not energized.
15-2a, 15-3a and 16a.

Next, the operation of the activation device configured as described above will be explained.

When the key switch 19 is in the stop position of the contact A, the current collector contacts 11c and 11d are moved by the sliding pieces 9. contact 1
1e is in contact with sliding piece 91, but relay 15.1
6 are not energized, both terminals of the motor 1 are the contacts 15-2C, 15-2a, and 15-2a of the relay 15.
Contacts 16c and 16a of relay 16, collector contact 11d,
It is short-circuited via LLC and connected to the positive side of the power supply, and does not rotate.

Therefore, the rack 4 is stopped.

Next, when the key switch 19 is turned on and the contact A is connected to the contact C at the starting position, the coil 17 of the relay 15 is energized.
1 b → Motor 1 → Contact 15-3b → Contact 15-3c →
Current flows from the contact point 11e to the contact point, the motor 1 rotates in the forward direction, and the rack 4 moves to the left in FIG. 3.

As a result, the contacts 11c and lld are connected to the sliding piece 9. The contact 11d immediately comes into contact with the sliding piece 91, but this does not affect the circuit operation at all.

As the rack 4 moves to the left, the contacts 11a and ll
b contacts the sliding piece 93, and then the contact 11b contacts the sliding piece 91 from the sliding piece 93, but this also has no effect on the circuit operation.

Just before the rack 4 reaches the starting position C, the contact 11e is connected to the sliding piece 9. However, the rack 4 moves due to the inertia of the motor 1, and when it reaches the starting position C, the contact 11e closes.

11f contacts the sliding piece 9□, both terminals of the motor 1 are short-circuited via the contacts 11e and llf, and the electric braking stops immediately.

The control rack is thus reliably stopped in the starting position.

Next, move the key switch 19 from contact C to contact B in the operating position.
When moved to , relay 15 is de-energized and relay 1
6 is excited, power supply positive pole → relay contact 15-1c
→Contact 15-1a→Motor 1→Relay contact 15-2c→
Current flows from contact 15-2a to contact 16c to contact 16b to collector contact 11b to sliding piece 91 to ground, motor 1 rotates in the opposite direction, and rack 4 moves to the right in FIG. .

As a result, the contact lie comes into contact with the sliding piece 9□ from the sliding piece 9□, and the contact with the contact 11f is broken, but this does not affect the circuit operation at all.

Next, the contact 11b is moved to the sliding piece 9. However, the rack 4 continues to move to the right due to the inertia of the motor 1, and when it reaches the operating position B, the contacts 11a and llb come into contact with the sliding piece 93, so the motor 1 11a and llb.

Therefore, electric braking is applied, the motor 1 immediately stops rotating, and the control rack is reliably stopped in the operating position.

Next, when the key switch 19 is moved from the contact B to the stop position contact A, the excitation of the relay 16 is cut off, so the contact 16c comes into contact with the contact 16a, and the power supply positive terminal → contact 15-1
c→Contact 15-1a→Motor 1→Contact 15-2c→Contact 15-2a→Contact 16c→Contact 16a-Contact 11d-Sliding piece 9. - Current flows to ground.

This causes the motor 1 to rotate in the opposite direction as before, and the rack 4 to move to the right in FIG. 3 again.

Just before the rack 4 reaches the stop position A, the contact 11d is connected to the sliding piece 9. However, due to the inertia of the motor 1, the rack 4 continues to move to the right, and when it reaches the stop position A,
The contacts 11c and lld are the sliding pieces 9. Since the motor 1 is in contact with the contacts 11c and lld, its terminals are short-circuited and the electric brake immediately stops rotating.

The control rack is thus reliably stopped at the stop position.

This state is the same as the circuit state at stop position A described at the beginning.

When the key switch 19 is moved from contact C at the start position to contact A at the stop position, the operation is exactly the same as when it is moved from contact B at the operating position to contact A, so a description thereof will be omitted. .

Next, when the key switch 19 is directly moved from contact A at the stop position to contact B at the operating position, the relay 16 is energized and the contact 16c comes into contact with the contact 16a, so the motor 1 is released from the short-circuited state. However, since the current collector contact 11b is not grounded, the motor 1 does not rotate.

Therefore, even if the key switch is turned from the stop position to the operating position, the motor 1 will not start.

As described above, according to this invention, the control rack of the fuel injection pump can be reliably stopped in the three positions of starting, running, and stopping in accordance with the operating position of the key switch 19, and also There is no disadvantage of stopping at the operating position during the movement process from the starting position to the starting position.

Moreover, the sliding pieces 91 to 9 are simply attached to the rack 4 via an insulator. Since accurate operation can be performed simply by providing the current collector 11 on the lid 14 of the rack case 12, there are many advantages such as simple structure, excellent durability, and low manufacturing cost.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view of a diesel engine starting device showing an embodiment of this invention, Fig. 2 is an explanatory diagram showing the usage state of the starting device, and Fig. 3 is an electric circuit diagram of the diesel engine starting device. . In the drawing, 1 is a reversible DC motor, 2 is a worm, 3 is a worm gear, 4 is a rack, 5 is a pinion, 6 is a push/pull wire, 7 is a diesel engine control rack lever, 9
1.9°? 93? 94 is a conductive sliding piece, 10 is an insulator, 11 is a current collector, 12 is a rack case, 15.16
is a relay and 19 is a key switch.

Claims (1)

[Scope of utility model registration request] A pinion is driven by a reversible DC motor via a worm gear, a rack is reciprocated by the pinion, the rack is connected to a control rack on the fuel injection pump side of a diesel engine, and the reversible DC motor is driven by a key switch. , in a diesel engine starting device that stops the control rack of the injection pump in the fuel stop, run, and start positions corresponding to the stop, run, and start positions of the key switch; Four conductive sliding pieces 90,9□?
93 f 94 is provided, and a contact point 11aw 1 that selectively contacts the sliding piece is provided at the sliding path portion of this sliding piece.
lbt I IC! 11dt 1let 1
A current collector consisting of 1f is arranged, and the contact 11a is commonly connected to the contact 11c, and the fixed contact 15-1 of the relay 15 is connected to the contact 11c.
a, fixed contact 15-3 b and one terminal of the DC motor 1, respectively, and the contact 11b is connected to the relay 16
The contact 11d is connected to the fixed contact 16b of the relay 16.
The contact 11e is connected to the fixed contact 16a of the relay 15.
The contact 11f is connected to the other terminal of the motor 1, the fixed contact 15-1a of the relay 15, and the movable contact 15-2c of the relay 15.
The movable contact 15-1c of the relay 15 is connected to the positive side of the power supply and the movable contact of the key switch 19, and the fixed contact 15-2a of the relay 15 is connected to the movable contact 16c of the relay 16.
Contact A (stop position) of the key switch 19 is left unconnected, contact B (operating position) of the key switch is grounded via the coil 18 of the relay 16, and contact C (start position) of the key switch is connected to the relay 15. The sliding piece 9□ is grounded through the coil 17, and when the relays 15 and 16 are excited, the movable contacts 15-1ct 15 2C
? 15 3C and 16c are fixed contacts 15-1b,
15-2b, 15-3b and 16b, and when not energized, fixed contacts 15-1a, 15-2a,
15-3a and 16a, and in position A (stop) of the rack 4 corresponding to the fuel stop position of the control rack, the current collector contacts 11a, 11b, l
lf is not in contact, and contacts 11c and lld are on the sliding piece 9. In position B (operation) of the rack 4 corresponding to the operating position of the control rack, the contacts 11a, 11b contact the sliding piece 93, and the contacts 11c, llf is not in contact, contacts 11d and lle are on the sliding piece 9. In addition, at the position C (starting) of the rack 4 corresponding to the starting position of the control rack, the contact 11a
, llc are not in contact, and the contacts 11b and lld are in contact with the sliding piece 91.
The sliding pieces 91, 9°, 93.9 . and collector contacts 11a, llb, 11CI Itch 1let
A diesel engine starting device characterized in that a relative position with respect to llf is set.