JPS62237079A - Starter - Google Patents

Abstract

PURPOSE:To enable driving of a starter motor after a pinion is brought into contact with or engaged with a ring gear, by a method wherein a plunger is divided into first and second plungers, and movement of the second plunger in which a moving contact point is situated is delayed. CONSTITUTION:With a key switch closed, a current flows to an exciting coil 3. By means of the exciting magnetic flux of an exciting coil 3, a first plunger 7 is attracted to the first solenoid 5a side. Simultaneously, a push rod 6 pushes out a drive shaft 15 through a steel ball 16. In this case, the end surfaces of a pinion 18 is butted to that of a ring gear 17, and when they are not engaged with each other, a pinion spring 19 is bent by an amount equivalent to a stroke (b)-(a). Thereafter, a second plunger 8 is attracted and is slid over the push rod 6, and the first spring 9 is bent, and the second plunger 8 is moved to the first plunger 7 side. This constitution causes a moving contact 11 to make contact with a fixed contact to feed a current to a starter motor 25.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starter for starting an internal combustion engine.

[Conventional technology]

In the conventional system, as shown in Japanese Utility Model Publication No. 51-21243, the plunger is attracted by energizing the solenoid, and the pinion is moved toward the ring gear by pressing the drive shaft in the axial direction with the rod. There is.

[Problem that the invention seeks to solve]

However, in the conventional device described above, the plunger meshes with the ring gear and drives the pinion by the suction force of the solenoid, but the movable contact that moves together with the plunger comes into contact with the fixed contact before the pinion and ring gear come into contact. There was a problem in that after the motor came in and the rotation was transmitted to the pinion, the engagement became poor.

[Means for solving problems]

Therefore, the present invention includes: a pinion that engages with a ring gear of an internal combustion engine; a starter motor that rotates the pinion; and a magnetic switch that moves the pinion toward the ring gear. a shaft for moving the shaft, a first plunger provided on the outer periphery of the shaft, a second plunger slidably provided on the outer periphery of the shaft, and between these first and second plungers. an energized spring; an excitation coil disposed on the outer periphery of the first and second plungers; a solenoid plate disposed on a side of the excitation coil to which the plunger is attracted; and the second plunger. The starter is equipped with a movable contact provided in the starter.

[Effect]

By separating the plunger into the first and second plungers, when the excitation coil is excited, the first plunger moves first, and then the plunger of the cylinder 2 moves.

〔Effect of the invention〕

As described above, by slowing down the movement of the second plunger provided with a movable contact, the magnetic switch can be closed and the starter motor can be driven after the pinion contacts or meshes with the ring gear. This has an excellent effect.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

In the figure, reference numeral 1 denotes a magnetic switch, and inside a case 2 of this magnetic switch 1, an excitation coil 3 is wound around the outer periphery of a bobbin 4. And excitation coil 3
A donut-shaped first solenoid plate and a U-shaped second solenoid plate 5a, 5b are provided at both ends of the solenoid plate. Also, the first
The solenoid plate 5a projects further inward than the inner peripheral surface of the bobbin 4.

A bushing rod 6 is provided on the inner peripheral side of the bobbin 4,
A stepped portion 6a is formed on the outer periphery of the bushing rod 6, and a first plunger 7 is slidably provided thereon. Further, a second plunger 8 is slidably disposed on the outer periphery of the bushing rod 6 with a gap C between the second plunger 7 and the first plunger 7 . Furthermore, the first plunger 7 and the second plunger
A first spring 9 is inserted between the plunger 8 and the plunger 8 . A washer 10 is provided at one end of the bush rod 6, and the first plunger 7, first spring 9, and second plunger 8 are held between the step portion 6a and the washer 10. Furthermore, a movable contact 1 ) pressed by a contact spring 12 is provided on the outer periphery of one end of the second plunger 8 .

The drive shaft 15 is disposed on the same axis as the bushing rod 6 via a steel ball 16, and a pinion 18 that meshes with the ring gear 17 of the internal combustion engine is attached to the outer periphery of one end.
is located.

A helically splined tube 20 is connected to the outer periphery of the drive shaft 15, and the tube 20 is rotatably held by the housing 22 and the case 2 via a bearing 21.

Further, a return spring 23 for returning the drive shaft 15 is arranged inside the tube 20. Further, a one-way clutch 24 is attached to the outer periphery of the tube 20, and a gear 2 is attached to the outer periphery of the one-way clutch 24.
4a is formed, and an idle gear 26 that meshes with a gear formed on the armature shaft of the starter motor 25 meshes with this gear 24a.

When the starter is not operating, the distance a between the binion 18 and the ring gear 17 is maintained, and the first solenoid plate 5
The distance between a and the first plunger 7 is b, and the distance between the first and second plunger 7 is
If the distance between the plunger 7.8 and the plunger 7.8 is C, then a≦b
<c.

Next, the operation of the above configuration will be explained. When a key switch (not shown) is closed, a current flows through the excitation coil 3. Then, due to the excitation magnetic flux of the excitation coil 3, the first plunger 7 is attracted toward the first solenoid plate 5a, and at the same time, the bushing rod 6 is moved through the steel ball 16.
Push out the drive shaft I5. At this time, Binion 1
If the ring gear 8 and the ring gear 17 come into contact with each other at their end surfaces and do not mesh with each other, the pinion spring 19 will be deflected by the stroke ba. Then, the second plunger 8 is further attracted and slides on the bushing, the first spring 9 is bent, the second plunger 8 moves toward the first plunger 7, and the movable contact 1) comes into contact with a fixed contact (not shown), and current is supplied to the starter motor 25.

The rotation of the starter motor 25 is then decelerated and transmitted to the one-way clutch 24 via the idle gear 26, and the decelerated rotation is transmitted to the pinion 18 via the tube 20 and the drive shaft 15. , the pinion 18 meshes with the ring gear 17, and the ring gear 17
Rotate to start the internal combustion engine.

Therefore, with the above-described configuration, after the first plunger 7 contacts the first solenoid plate 5a, the second plunger 7
Since the plunger 8 of is set to suction, the pinion 1
The movable contact 1) of the magnet switch 1 is closed before the pinion 8 meshes with the ring gear 17, and the meshing performance between the pinion 18 and the ring gear 17 can be reliably improved without rotating the pinion 18.

Note that the same applies to other embodiments described below.

(Although the movable contact is disposed on the second plunger, it may be separated from the second plunger.

fb) The pinion shaft and the rond shaft are the same, but even if the shafts are different, the same effect can be achieved as long as there is another connection means (for example, a lever).

(C) The length of the second plunger is longer than the first plunger, but the same effect can be obtained if this is changed according to the suction force of the solenoid.

[Brief explanation of drawings]

The figure is a sectional front view of essential parts showing an embodiment of the starter of the present invention. 1...Magnetic switch, 3...Exciting coil, 5
a, 5b... 1st. Second solenoid plate 6.
... Butsch rod, 7... First plunger, 8.
...Second plunger, 9...Spring, 17...
・Ring gear, 18... Binion, 25... Starter motor.

Claims (2)

[Claims] (1) A pinion that meshes with a ring gear of an internal combustion engine, a starter motor that rotates the pinion, and a magnetic switch that moves the pinion toward the ring gear, the magnetic switch having a shaft that moves the pinion. a first plunger provided on the outer periphery of the shaft; a second plunger slidably provided on the outer periphery of the shaft; and a spring biased between the first and second plungers. , an excitation coil disposed on the outer peripheral side of the first and second plungers, a solenoid plate provided on the side of the excitation coil to which the plunger is attracted, and a movable contact provided on the second plunger. A starter equipped with. (2) The starter according to claim 1, wherein the distance between the first plunger and the exciting coil is greater than the distance between the pinion and the ring gear.