JPS59153972A - Engine starter device - Google Patents

Abstract

PURPOSE:To protect contact surfaces of gears, by controlling a starter motor so as to be turned at a high speed after the pinion gear is surely engaged with the ring gear. CONSTITUTION:An electric current is allowed to flow in a starter motor 10 from a battery 3 through a normally open contact 11a of a delay switch 11, controlling said delay switch 11 so as to be started when the contact 2e of a solenoid switch 2 is closed. In this way, a pinion gear 6, while it is rotated at a low speed, is adapted to a ring gear 8, and even if these gears are not immediately engaged, a rotary speed of the ring gear gradually increases, generating the resistance in a rotary unit at a certain level, accordingly a slip is caused between the pinion gear 6 and the ring gear 8, resulting in the good engagement of these gears.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine starting device for driving a rotating body having a relatively small rotational moment, such as a gas turbine.

Conventional starting devices for general automobile engines are described, for example, in Chapter 4 of Part 10 of the New Automotive Engineering Handbook (published by the Society of Automotive Engineers of Japan on March 25, 1971). It is configured as shown in the figure.

To explain this simply, when the starting switch 1 is closed, current is applied from the battery 3 to the shunt coil 2a and series coil 2b of the electromagnetic switch 2, the plunger 2c is returned and attracted against the spring 2d, and the shift lever 4 is rotated about the shaft 5 in the direction of the arrow Δ, and the pinion gear 6 is slid in the direction of the arrow B by the screw spline 7. guess. In this case, the pressure spring is compressed.

During this time, the current passing through the series coil 2b of the electromagnetic switch 2 flows through the armature of the starter motor 0 and escapes to the ground, so the starter motor 10 rotates at a low speed. Therefore, the pinion gear 6 fitted onto the rotating shaft via the threaded spline 7 also slides while rotating gently, and meshes with the ring gear 8.

When the contact 2e is closed by the plunger 2c of the electromagnetic switch 2, a large current flows directly from the battery 3 to the starter motor 10, causing the starter motor 0 to rotate at high speed and start the engine.

However, when such a conventional engine starting device is used as a starting device for an engine whose rotating body (driven body) has a small moment of inertia, such as a gas turbine engine, the following problem occurs.

When the plunger 2G of the electromagnetic switch 2 is attracted by the opening of the ρ71 dynamic switch 1, and the shift lever 4 presses the pinion gear 6 against the ring gear 8, there is no problem if the pinion gear 6 enters the ring gear 8 successfully. However, if it does not enter, the pinion gear 6 hits the side of the ring gear 8.

At this time, pinion gear 6 is rotating slowly, so
Normally, there should be slippage between the ring gear and the side surface of the ring gear 8, but when this ring gear is attached to the rotor of a gas turbine, its moment of inertia is small. They rotate together without occurring.

If the contact point 2e is closed in such a state and the starter motor 10 suddenly rotates at high speed, the pinion gear 6 and ring gear 8 may rotate without meshing with each other, and their contact surfaces may be scraped.

This invention was made with a focus on such problems, and even when starting an engine that rotates a rotating body with a relatively small rotational moment, such as a gas turbine, the pinion gear can be reliably connected to the ring gear. The purpose of this invention is to enable the starter motor to start rotating at high speed after the starter motor is engaged with the engine, thereby ensuring reliable starting.

Therefore, the engine starting device according to the present invention is provided with starter motor delay drive means for rotating the starter motor at high speed with a predetermined delay time after the pinion gear is pressed against the ring gear.

Hereinafter, the present invention will be explained in detail with reference to FIGS. 2 and 3 in the illustrations. Parts corresponding to the conventional example in FIG. is omitted.

FIG. 2 shows a first embodiment of the invention, in which a normally open contact 11 of a delay switch 11 is connected to a starter motor 10 from a battery 3.
a to cause current to flow through the delay switch 11
is activated when the contact 2e of the electromagnetic switch 2 is closed.

This delay switch 11 is a starter motor delay drive means, which closes the normally open contact 11a after a predetermined delay time has elapsed after the contact 2e is closed and started, and causes a large current to flow through the starter motor 10 to rotate it at high speed. This delay time can be defined as, for example, the low speed rotation time of the starter motor of 50 ms.
Set it so that it is above.

In this way, even if the pinion gear 6 contacts the ring gear 8 while rotating at a low speed and does not touch the ring gear 8 immediately as described above, the rotational speed of the ring gear will gradually increase and the rotating body (driven Since a certain amount of resistance is generated in the pinion gear 6 and the ring gear 8, slipping occurs between the pinion gear 6 and the ring gear 8, allowing them to mesh well.

Next, FIGS. 3 and 4 are diagrams showing only the main parts of a second embodiment of the invention.

In this second embodiment, the plunger 2c of the electromagnetic switch 2 is divided into a drive plunger 21 for driving the shift lever 4 and a switch plunger 22 for closing the contact 2e, and the end of the drive plunger 21 As shown in FIG. 4, there is a hole 21 extending in the axial direction. is provided, and the end of the switch plunger 22 is inserted into this hole 21a so that it can move freely relative to the switch in the axial direction, and is designed to be flexible.

Then, wind the coil 2a around the drive plunger 21 to the shunt 1, wind the series coil 2b around the switch plunger 22, and connect the ground side of the shunt coil 2a to the starter motor 1.
0 and ground it, and the delay circuit 2 is connected to the series coil 2b.
3, and the earth side is directly grounded, and these constitute a starter motor delay drive means.

The delay circuit 23 is activated when the start switch 1 is closed, and
After a predetermined period of time (for example, 50 m5 or more), the series coil 2b is energized.

According to this embodiment, when the start switch 1 is closed,
First, the coils 1 to 1 of the electromagnetic switch 2 are energized, the driving plunger 21 moves to the left in FIG. 3, and the shift lever 4
The pinion gear 6, which has started to rotate slowly by the starter motor 10, is pressed against the ring gear 8 (second
(see figure).

In this state, the pinion gear 6 gradually rotates faster and slips between it and the ring gear 8, causing them to interfere with each other.
The delay circuit 23 energizes the series control and coil 2b, and the switch plunger 22 moves to the left in FIG.
Close.

As a result, a large current flows through the starter motor 10 to start rotating at a high speed, and the engine can be reliably started.

As described in the following two embodiments, the engine starting device according to the present invention rotates the starter motor at high speed with a predetermined delay time after the pinion gear is pressed against the ring gear on the engine side. The rotational moment of a rotating body like a gas turbine engine 1 - or the moment of inertia! Even if ・is small, the starter motor will rotate at high speed after the pinion gear is securely engaged with the ring gear.

Therefore, the engine can be started reliably at all times without causing the ring gear to rotate and the contact surface between the two to be scraped.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an example of a conventional engine starting device. FIG. 2 is a block diagram similar to FIG. 1 showing a first embodiment of the invention. FIG. 6 is a configuration diagram of a main part showing a second embodiment of the present invention, and FIG. 4 is an enlarged sectional view of the insertion portion of the switch plunger into the driving plunger. 1. Starting switch 2... Electromagnetic switch 2a...
・Shunt coil 2b・・Series coil 2c・・Plunger 2e・・Contact 3・・Battery
4...Shift lever 6...Pinion gear 8.
...Ring gear 10...Starter motor 11...
Delay switch 21... Drive plunger 22... Switch plunger 23... Delay circuit Fig. 1

Claims (1)

[Claims] 1 A starter motor, a pinion gear rotated by the starter motor, an electromagnetic switch that is excited when the starting switch is opened, and a shifter that is actuated by the plunger of the electromagnetic switch to press the pinion gear against a ring gear on the engine side. In an engine starting device for driving a rotating body having a relatively small rotational moment 1, such as a gas turbine, the starter motor is started after a predetermined delay time after the pinion gear is pressed against the ring gear. An engine starting device comprising a starter motor delay drive means for rotating at high speed.