JPH0735765B2 - Starter - Google Patents

Description

The present invention relates to a structure for preventing a pinion from engaging with a ring gear during inertial rotation of a starter motor.

[Conventional technology]

As shown in Japanese Utility Model Laid-Open No. 55-76851, the conventional type has a structure in which the protection relay is mechanically opened and closed by the movement of the magnet switch plunger to prevent the pinion from jumping into the ring gear during inertial rotation. ing.

Further, in Japanese Utility Model Publication No. 50-12585, the protection relay is closed when the starter is operating and needs to be opened only during inertial rotation, forming a circuit for energizing the exciting coil of the protection relay only during inertial rotation. By having the auxiliary relay for circuit switching, the re-jumping prevention is performed in the same manner as above.

[Problems to be solved by the invention]

However, the above-mentioned conventional one (Japanese Utility Model Publication No. 55-76851) has a structure in which the protection relay is mechanically opened and closed by moving the plunger of the starter magnet switch. The contact state of the protection relay must be immediately after the magnet switch plunger returns from the operating position to the rest position, i.e., when the starter motor is inertially rotating, and after that, that is, when the starter motor inertial rotation is stopped. Must be held closed for the next actuation. Although the magnet switch plunger is stationary and in the same position during the opening and closing of the protection relay, the protection relay associated therewith must change from the open state to the closed state. Therefore, even if the plunger returns to the stationary position, a delay mechanism is required to keep the protective relay in the open state for a while, and this delay mechanism has a problem that it is complicated by combining a buffer spring and a helical spline.

Further, in another conventional technology (Japanese Utility Model Publication No. 50-12585), the circuit is closed when the starter is operating and needs to be opened only during inertial rotation, so that the exciting coil of the protection relay is energized only during inertial rotation. There is a problem in that an additional auxiliary relay for switching the circuit for forming the circuit is required, which is complicated.

[Means for solving problems]

Therefore, the present invention provides a starter motor for driving a pinion that meshes with a ring gear of an internal combustion engine, a first fixed contact connected to a power source, a second fixed contact connected to the starter motor, the body 1, A plunger having a movable contact in contact with a second fixed contact; a suction coil and a protection coil for moving the plunger to the first and second fixed contacts to move the pinion to the ring gear side; A starter switch connected between the power switch and the first fixed contact and between one end of the protection coil and one end of the suction coil; and the other end of the suction coil. A third fixed contact (4a) provided, and a fourth fixed contact (4h) connected between the second fixed contact and one end (5a) of the starter motor.
A normally-closed movable contact piece (4c) that comes into contact with the third and fourth fixed contacts, one end of which is connected to the fourth fixed contact and one end of the starter motor, and the other end of which is the other end of the starter motor. A relay coil (4d) connected to (5b), so that the relay coil is excited only by the inertial rotation output of the starter motor, and the movable contact piece is opened from the third and fourth fixed contacts. And a starter equipped with the relay.

[Operation and effect of the invention]

As described above, in the present invention, the relay is the third fixed contact (4a) provided at the other end of the suction coil.
A fourth fixed contact (4h) connected between the second fixed contact and one end (5a) of the starter motor, and a normally closed movable contact that abuts the third and fourth fixed contacts. Piece (4c)
And a relay coil (4d) having one end connected to the fourth fixed contact and one end of the starter motor and the other end connected to the other end (5b) of the starter motor. Since the relay coil is excited only by the output and the movable contact piece is opened from the third and fourth fixed contacts, the starter operation does not occur even if the protective relay contact is open from the starter motor operation. Since there is no effect, the means such as an auxiliary relay that distinguishes the operating rotation and the inertial rotation of the starter motor becomes unnecessary, and while the starter motor is generating electric power due to the inertial rotation, the excitation coil must be excited by this power. The protection relay is opened, and when the inertial rotation stops, it is no longer excited and immediately closes, so the protection relay is a mechanically driven relay. As is the case, the timing adjustment mechanism for the movement of the drive side and the movement of the protection relay is completely unnecessary, and it has the excellent effect of being able to prevent re-jumping with a really simple configuration of adding the relay only once. Have

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings. In the figure, 1 is a power source and 2 is a start switch. Reference numeral 3 is an ordinary electromagnetic push-type magnet switch, which is configured as follows.

3a is a holding coil whose one end is grounded, and 3b is a suction coil whose one end is connected to the other end of the holding coil 3a.
Inside the 3a and the suction coil 3b, the first movable contact 3c is provided at one end.
Plunger 3d provided with is arranged. 3e and 3f are first and second fixed contacts with which the first movable contact 3c abuts, and the first fixed contact 3e is connected between the power source 1 and the start switch 2 and is the second fixed contact. 3f is connected to the + side brush 5a of the starter motor 5.

4 is a normally-closed protection relay, 4a is a third fixed contact, which is provided at the other end of the suction coil 3b, 4b is a fourth fixed contact, and the first fixed contact 3e of the magnet switch 3 is provided. And the starter motor 5 are connected. Reference numeral 4c is a second movable contact piece that is normally in contact with the third and fourth fixed contacts 4a and 4b. Further, 4d is a relay coil provided on the outer periphery of the second movable contact piece 4c, and one end thereof is the fourth fixed contact.
It is connected between 4b and the starter motor 5, and the other end is grounded.

The starter motor is a motor that uses a permanent magnet 5c for the field, and one end of the brush 5b is grounded.

Next, the operation of the above configuration will be described. When the start switch 2 is closed, the holding coil 3a is excited from the power source 1 via the holding coil 3a → ground, and the suction coil 3b is also excited.
→ The third fixed contact 4a of the protection relay 4 → The second movable contact piece 4c
→ 4th fixed contact 4b → + side brush 5a of starter motor 5
→ − side brush 5b → Exciting the suction coil 3b through the ground. At this time, the resistance of the starter motor 5 is the suction coil.
Since it is sufficiently smaller than 3b, the voltage applied to the protection relay 4 is lower than the operating voltage, and the protection relay 4 does not operate.

Then, by the attraction force of the suction coil 3b and the holding coil 3a, the plunger 3d is attracted, the pinion (not shown) is moved to the ring gear side (not shown), and is engaged.
The first movable contact 3c contacts the first and second fixed contacts 3e, 3f. Then, a current flows through the relay coil 4d of the protection relay 4 via the power supply 1 → the first fixed contact 3e → the first movable contact 3c → the second fixed contact 3f to open the protection relay 4.
Then, no current flows through the suction coil 3b, and the holding coil 3a
Hold the plunger 3d moving only.

In addition, the current from the power supply 1 is + side brush 5a → -side brush
5b → Flows through the ground to drive the starter motor 5. Then, the pinion is driven to start the internal combustion engine.

Next, after starting the engine, when the start switch 2 is opened, the holding coil
No current flows through 3a, the plunger 3d returns to its original state, and the first movable contact 3c separates from the first and second fixed contacts 3e, 3f. However, while the starter motor 5 is inertially rotating, a current is caused to flow through the relay coil 4d of the protection relay 4 by the voltage generated by the inertial rotation of the starter motor 5, and the protection relay 4 has a very small rotation of the starter motor 5. Keep open until time. Even if the driver mistakenly recloses the start switch 2 during inertial rotation of the starter motor 5 such as when the engine fails to start due to the operation of the protection relay 4 as described above,
No current flows through the attraction coil 3b of the magnet switch 3,
Since the magnet switch 3 does not operate because the plunger 3d cannot be attracted, the pinion during inertial rotation is completely prevented from hitting and breaking the ring gear of the engine. Although it is possible to use a wire wound motor in which a field coil is wound around the field, since the voltage generated during inertial rotation is small, setting the relay operating / restoring voltage is somewhat difficult, so It was also found that the protection relay can be easily set by applying it to a motor using a permanent magnet.

[Brief description of drawings]

The drawing is an electric circuit diagram showing an embodiment of the starter of the present invention. 1 ... Power supply, 2 ... Start switch, 3 ... Magnet switch, 3a
... Holding coil, 3b ... Suction coil, 3c ... First movable contact, 3d
... Plunger, 3e ... First fixed contact, 3f ... Second fixed contact, 4 ... Protective relay, 4a ... Third fixed contact, 4b ... Fourth fixed contact, 4c ... Second movable contact piece, 4d … Relay coil, 5… Starter motor.

Claims (2)

[Claims] 1. A starter motor for driving a pinion that meshes with a ring gear of an internal combustion engine, and a first power source connected to a power source.
Fixed contact, a second fixed contact connected to the starter motor, a plunger having a movable contact that abuts on the first and second fixed contacts, and the plunger on the first and second fixed contact sides. A magnet switch having a suction coil and a holding coil for moving the pinion to the ring gear side, between the power supply and the first fixed contact, and one end of the holding coil. A start switch connected to one end of the suction coil, and a third fixed contact (4
a) and a fourth fixed contact (4h) connected between the second fixed contact and one end (5a) of the starter motor,
Normally-closed movable contact piece (4b) contacting the third and fourth fixed contacts
And a relay coil (4d) having one end connected to the fourth fixed contact and one end of the starter motor and the other end connected to the other end (5b) of the starter motor. A relay in which the relay coil is excited only by an output and the movable contact piece is opened from the third and fourth fixed contacts. 2. The starter according to claim 1, wherein the field of the starter motor is a permanent magnet.