JPS6036786Y2 - Starter pinion meshing device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pinion engagement device for a starter that moves a pinion by a lever operated by an electromagnetic device and meshes with a ring gear to start the engine.

Generally, a pinion transfer device uses an electromagnet to push the pinion that fits into the starter shaft to the front via a lever.
It engages with a stationary ringer.

This type of conventional device shown in FIG.
When closed, current flows from the battery 2 to the voltage coil 4 and current coil 5 of the electromagnetic switch 3.

When this current excites the plunger 6, the plunger 6 is pulled in against the force of the return spring 15, and the shift lever 10
Pinion 9 is pushed out and meshes with ring gear 11 via.

When the pinion 9 is completely engaged with the ring gear 11, the movable contact 12 is pressed against the fixed contact 13, and the main current is transferred to the motor 8.
to start the flow engine.

Reference numeral 14 denotes a lever spring for applying pressure to facilitate engagement between the pinion 9 and the ring umbrella wheel 11.

The voltage coil 4 and the current coil 5 constitute an excitation coil for moving the plunger 6, and the voltage coil 4
After the plunger 6 moves due to this and the excitation of the current coil 5 and the contacts 12 and 13 close, the plunger 6
This is for holding against the force of the return spring 15.

That is, when the switch 1 is closed, a large current flows instantaneously through the current coil 5 and attracts the plunger 6, while a constant voltage is applied to the voltage coil 4 to hold the plunger 6.

By the way, copper wire is generally used for the voltage coil 4 and current coil 5, and the specific resistance changes by about 0.4%/℃ as the temperature changes.As the temperature rises, the resistance of the coil increases, so the excitation current decreases. The operating voltage at which the plunger begins to operate increases.

The starter is often installed near the engine's cylinder block and exhaust pipe and is exposed to high heat.

Furthermore, in the case of automobiles, it has been observed that while the engine is running, the temperature is low due to good ventilation in the engine compartment due to the running wind, but when the engine is stopped, heat is trapped in the closed engine compartment and the temperature rises.

Therefore, when trying to restart the engine, the temperature of the electromagnetic switch 3 has increased, so the required operating voltage of the plunger 6 has increased, and the starter does not operate.

In addition, if the engine is not started repeatedly and the engine is not started, the temperature of the starter itself increases and the operating voltage for operating the plunger 6 increases, often resulting in malfunction.

Therefore, a method of reducing the operating voltage of the electromagnetic switch 3,
In other words, the methods for securing the electromagnetic force capable of moving the plunger 6 even at a rise in temperature are 1) increasing the number of turns of the voltage coil 4 and current coil 5, and 2) increasing the inflow current of the voltage coil 4 and current coil 5. , 3] There are methods such as installing a separate relay near the starter mounting part to correct the voltage drop from the battery 2 to the electromagnetic switch 3 due to the current flowing into the voltage and current coil, but the electromagnetic switch 3 becomes larger. There were drawbacks such as complicated wiring.

Also, if the operating voltage is extremely low, a large excitation current will flow at low temperatures or room temperature, and the magnetic flux will increase than at high temperatures, so the attraction force of the plunger 6 will become too large, causing the pinions 9 to engage. When dust or the like adheres to the shaft and the sliding becomes a little difficult, the plunger 6 deflects only the lever spring 14 and closes the contacts 12 and 13.
The motor 8 rotates while rotating the pinion 9 and ring gear 11.
There were times when the teeth would not mesh properly.

In order to avoid the above problems, the present invention connects a resistor in series to the voltage coil 4 or current coil 5, and connects the resistor in parallel to the temperature of the electromagnetic switch case or the temperature of the voltage coil 4 or current coil 5 inside the electromagnetic switch case. A starter pinion that operates stably from room temperature to high temperature (80 to 100°C) by connecting a contact that is operated by the The present invention provides an interlocking device.

An embodiment of the present invention will be described below with reference to FIG. 2. At the end of the winding of the voltage coil 4, a resistor R1 is provided with thermostat contacts Th at both ends of the resistor R.

At room temperature, the thermostat contact ■ is always open, and the current flowing through the voltage coil 4 passes through the resistor R and is grounded. However, when the temperature exceeds the set temperature, the thermostat contact Th is closed, the resistor R is short-circuited, and the current flowing through the voltage coil 4 is Contact T
flows to ground through h.

The value of the resistance R is determined by the thickness of the wiring from the battery 2 to the motor 8 via the starter switch 1, the resistance value, and the operating voltage of the electromagnetic switch 3. The amount of electricity applied to the two is set to be almost the same.

It is preferable that the thermostat contact Th be directly attached to the case of the electromagnetic switch 3 or the voltage coil 4 and the current coil 5 to detect the temperature around it.

Also, the resistor R thermostat contact Th may be provided on the current coil 5 side instead of the voltage coil 4 side, but since the energizing current is larger than that of the voltage coil 4, the thermostat contact Th
Since h becomes large, it is desirable to provide it on the voltage coil 4 side.

As described above, this invention connects a resistor in series with the voltage coil or current coil of the electromagnetic switch that controls the engagement of the pinion and ring gear of the starter, and connects the resistor in parallel to the temperature of the coil or case of the electromagnetic switch 1. Since a contact point that detects and opens/closes is connected, the pinion can be reliably moved and engaged with the ring gear even when the temperature rises.

Further, this has the advantage that there is no need for the electromagnetic switch to become large, the wiring to be complicated, or the possibility that the motor will be energized before engagement occurs.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram of a conventional device, and FIG. 2 is an electric circuit diagram showing an embodiment of this invention. In the figure, 3 is an electromagnetic switch, 4 is a voltage coil, 5 is a current coil, 9 is a pinion, 11 is a ring gear, R is a resistor,
indicates a thermostat contact.

Claims (1)

[Scope of utility model registration request] A pinion meshing device for a starter includes an excitation coil that is excited by electricity from a battery and magnetizes and moves a plunger by this excitation, and a pinion that meshes with a ring gear when the plunger moves. A resistor is connected in series, and a resistor is connected in parallel with the resistor to detect the temperature around the excitation coil, which opens when the temperature is low or room temperature, and closes when the temperature is high to connect both ends of the resistor. and a short-circuiting thermostat contact, and the resistance value of the resistor is set so that the amount of current applied to the excitation coil is approximately the same when the thermostat contact is opened and closed. Starter pinion engagement device.