JPS634020B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a starting device for an internal combustion engine, and more particularly to a wiring structure for a two-stage mesh starter in which a mag switch contact does not close unless a pinion engages a ring gear.

The wiring of a conventional two-stage mesh starting device (starter) as disclosed in, for example, Japanese Unexamined Patent Publication No. 56-72256, has a configuration as shown in FIG. The positive terminal of battery 1 is battery terminal 3 of key switch 2, B terminal 5 of mag switch 4, and starter relay 6.
is connected to the terminal 6a of the air heater relay 7 and the terminal 7a of the air heater relay 7, and the negative electrode is grounded. key switch 2
The air heater relay terminal 8 is connected to one end of the excitation coil 9 of the air heater relay 7, and the other end of the excitation coil 9 is grounded. Terminal 7b of air heater relay 7 is connected to one end of air heater 10, and the other end of air heater 10 is grounded. The mag switch terminal 11 of the key switch 2 is connected to one end of the excitation coil 12 of the starter relay 6 and one end of the excitation coil 9 of the air heater relay 7, and the other end of the excitation coil 12 of the starter relay 6 is grounded. . The terminal 6b of the starter relay 6 is connected to the input terminal 13 of the mag switch 4, and this input terminal 13 is connected to one end of the holding coil 14 and one end of the current coil 15, and the other end of the holding coil 14 is It is grounded, and the other end of the current coil 15 is connected to an M terminal 16. This M terminal 16 is the starter motor 1
The starter motor 17 is connected to the stator coil side of the starter motor 17, and the armature side of the starter motor 17 is grounded.

When the key switch 2 is placed on the mag switch terminal 11 side, current flows through the excitation coil 12 of the starter relay 6, terminals 6a and 6b are closed, and the current from the battery 1 flows from the input terminal 13 of the mag switch 4 through the current coil 15 to the starter motor 17. At the same time, the pinion moves toward the ring gear. As a result, the starter motor 17 is started, and the pinion rotates and meshes with the ring gear. That is, in order to obtain the starting current to the starter motor 17 necessary for meshing the pinion and ring gear, the current coil 15 of the mag switch 4 has a small coil resistance, so the large current of the mag switch 4 can be turned on and off directly by the key switch 2. In this case, there is a possibility that the contacts will burn out, so the starter relay 6 is required.

When the pinion and ring gear mesh, the B terminal 5 and M terminal 16 of the mag switch 4 are closed, and current is supplied to the starter motor 17 from the battery 1 through the B terminal 14 and the M terminal 16, and the motor rotates at full power.

When the key switch 2 is placed on the air heater relay terminal 8 side, current flows through the excitation coil 9 of the air heater relay 7, terminals 7a and 7b are closed, and current flows from the battery 1 to the air heater 10. This air heater 1
The air heater 10 is used to assist in starting the engine in cold weather, but since the air heater 10 also requires a large current, its resistance is small, and the current must be turned on and off via the air heater relay 7 as well. Note that the pinion and ring gear are not shown.

As described above, the conventional wiring for this type of starter requires two relays, the starter relay 6 and the air heater relay 7, and has the disadvantage of increasing the number of parts. Further, in order to obtain a starting current for the starter motor 17, the current coil 15 of the mag switch 4 becomes large, which has the disadvantage of increasing the size of the device.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a starting device for an internal combustion engine that has a small number of parts, is small, and is inexpensive.

The present invention focuses on the fact that, in the wiring of a two-stage mesh starting device (starter), the starter motor current required to engage the pinion and ring gear and the air heater current are approximately the same, 100A to 200A.
An air heater is connected to a terminal of a starter motor, and a starting current for the motor is supplied through the air heater.

An embodiment of the starting device for an internal combustion engine according to the present invention will be described below with reference to FIG. 2, in which the same parts as in the conventional example are designated by the same reference numerals.

The key switch 2 consists of a battery terminal 3, an air heater relay terminal 8, and a mag switch terminal 11.
The battery terminal 3 is connected to the positive terminal of the battery 1, and the air heater relay terminal 8 is connected to the excitation coil 9 of the air heater relay 7.
and the cathode side of the diode 18,
The mag switch terminal 11 is connected to the input terminal 13 of the mag switch 4 and the anode side of the diode 18, respectively. Note that a diode 18 inserted between the air heater relay terminal 8 and the mag switch terminal 11 prevents current from flowing from the air heater relay terminal 8 to the mag switch terminal 11.

One end of the current coil 15 of the mag switch 4 is connected to the input terminal 13, and the other end is connected to the M terminal 16.
and the stator coil side of the starter motor 17, one end of the holding coil 14 is connected to the input terminal 13, and the other end is grounded. The positive electrode of the battery 1 is connected to the B terminal 5 of the mag switch 4 and the terminal 7a of the air heater relay 7, and the terminal 7b of the air heater relay 7 is connected to one end of the air heater 10. The other end of the air heater 10 is connected to the stator coil side of the starter motor 17, and the armature side of the starter motor 17 is grounded.

Next, the operation of this embodiment will be explained. When using the air heater 10, when the key switch 2 is put into the air heater relay terminal 8, a current flows through the excitation coil 9 of the air heater relay 7, and the terminals 7a and 7b are closed. Then, current flows from the battery 1 to the air heater 10, and at the same time, a low voltage is applied to the starter motor 17 via the air heater 10, causing the starter motor 17 to rotate at a slow speed. Note that this low voltage is determined by the resistance ratio between the air heater 10 and the starter motor 17, and is approximately one tenth of the voltage of the battery 1.

Next, when the key switch 2 is connected to the mag switch terminal 11, current is passed through the diode 18 to the excitation coil 9 of the air heater relay 7, and the terminals 7a and 7
At the same time that the current coil 15 of the mag switch 4 and the holding coil 14 are applied, voltage is applied to the current coil 15 and the holding coil 14 of the mag switch 4. current coil 15
Since the starter motor 17 is connected to the starter motor 17, current from the battery 1 flows through the starter motor 17 from both the air heater 10 and the current coil 15, so that it starts rotating at a slow speed. For this reason, the starter motor 17
When the pinion and ring gear are completely engaged, the B terminal 5 and the M terminal 16 are closed, and the current from the battery 1 is transferred to the starter motor 17 from the B terminal 5 and the M terminal. 16, the starter motor 17 performs full rotation to start the internal combustion engine. At this time, a current of about 50A flows through the current coil 15 of the mag switch 4, and the air heater 10
A current of 100-150A flows through it.

According to this embodiment, the current for the starter motor 17 required when the pinion and ring gear engage can be supplied from the battery 1 through the air heater 10, so that the current coil 1 of the mag switch 4 can be supplied from the battery 1 through the air heater 10.
It is sufficient that the current 5 is large enough to move the pinion, and the current flowing through the current coil 15 is small. Therefore, the current coil 15 is made smaller (the amount of copper is significantly reduced), and the mag switch 4 is made smaller. It has the effect of In addition, since the current flowing through the current coil 15 is reduced, the current to the mag switch 4 can be turned on and off using the contacts of the key switch 2, and the starter relay that was previously required can be omitted, reducing the number of parts. This has the effect of reducing the cost of the entire device.

Note that even if the current is supplied to the starter motor 17 via the air heater 10, the resistance of the starter motor 17 is very small compared to the resistance of the air heater 10, so the current flowing to the air heater 10 is almost unchanged from the conventional value. There is almost no deterioration in performance. Furthermore, in the configuration of this embodiment, even when the air heater 10 is used, the starter motor 1
7, the motor rotates at a very low speed, but there is no problem since the rotation is particularly low. The advantage of this is that since the key switch 2 rotates at a very low speed before it is inserted into the mag switch terminal 11 side, it removes the resistance of the sliding part of the device at night during winter, making it easier to engage the pinion and ring gear.
When the starter motor 17 is rotated at a slow speed with the pinion on the mag switch terminal 11 side, the pinion and ring gear can be smoothly engaged.

As described above, the internal combustion engine starting device of the present invention has the advantage of having a small number of parts, making it compact and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a schematic circuit diagram showing an electric circuit of a conventional starting device for an internal combustion engine, and FIG. 2 is a schematic circuit diagram showing an electric circuit of an embodiment of the starting device for an internal combustion engine according to the present invention. 1...Battery, 2...Key switch, 3...
Battery terminal, 4...Mag switch, 5...B terminal, 7...Air heater relay, 8...Air heater relay terminal, 11...Mag switch terminal, 15...Current coil, 16...M terminal, 17...Starter motor, 18 ……diode.

Claims (1)

[Claims] 1 Supply current from the battery to the air heater via the air heater relay connected to the key switch,
A two-stage mesh internal combustion engine in which current is supplied from the battery to a starter motor via a mag switch connected to the key switch, and the contacts of the mag switch do not close unless a pinion rotated by the starter motor engages a ring gear. In the starter, a terminal on the side opposite to the air heater relay of the air heater is connected to the starter motor, and a current flows from the air heater relay side terminal to the mag switch side terminal between the terminal to which the air heater relay of the key switch is connected and the terminal to which the mag switch is connected. What is claimed is: 1. A starting device for an internal combustion engine, characterized in that a diode is connected to prevent this from occurring, and a key switch is turned on to supply current from a battery to the starter motor via the air heater.