JPH0754742A - Starter - Google Patents

Abstract

PURPOSE:To provide a starter in which a switch is miniaturized while improving meshing operability with a ring gear. CONSTITUTION:A pinion gear 70 and a clutch 20 are separated, to provide a spring 60 therebetween. A movable core 50 of a magnet switch 30 is connected to a shift lever 40 not through the spring. A shaft 10b is engaged with the clutch 20 by straight splines 10a, 110b, and the pinion gear 70 is engaged with a tube 90a of the clutch 20 by torsional splines 70a, 90c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starter for advancing a pinion gear and engaging with a ring gear on the engine side by utilizing the attraction force of a movable iron core when the engine is started.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, a starter for an engine has a torsion spline 2a which engages with a torsion spline 1a provided on a shaft 1b of an armature 1 of a motor.
And a one-way clutch 2 that is movable in the front-rear direction and has a pinion gear 2b that meshes with the engine-side ring gear 10 at its tip.

Further, it is rotatable about a fulcrum 4a and is movable at one end 4
c is connected to the clutch connecting portion 2C, and the other end 4d is connected to the connecting portion 7a of the joint 7 built in the hollow portion 5a of the movable iron core 5 which is movable in the magnet switch 3 in the left-right (front-back) direction in the drawing. It has a shift lever 4. The joint 7 is constantly pressed rightward (rearward) in the figure by the spring 6 and is movable in the left-right (front-rear) direction in the figure.

The operation of the above configuration will be described below.
When a current flows through the coil in the magnet switch 3, the movable iron core 5 is attracted to the right (rear) in the figure, and the shift lever 4 rotates in the direction of arrow A about the fulcrum 40a. Therefore, the one-way clutch 2 advances on the shaft 1b. From the time when the end surface of the pinion gear 2b at the tip of the one-way clutch 2 comes into contact with the end surface of the engine side ring gear 10, the spring 6 built in the movable iron core 5 bends.

When the movable iron core 5 is further moved, the main contact in the magnet switch 3 is closed and the armature 1 is rotated to rotate to a position where the pinion gear 2b and the ring gear 10 can mesh with each other, the reaction force of the spring 6 meshes with the pinion gear 2b. .

[0006]

In the above structure, when the pinion gear 2b abuts on the ring gear 10 and the one-way clutch 2 must be pushed out when the ring gear 10 is engaged, the spring 6 built in the movable iron core 5 accordingly. Is required, and the attraction force of the magnet switch 3 is required accordingly, which is a factor that hinders downsizing of the magnet switch.

An object of the present invention is to provide a starter in which the magnet switch can be downsized and the meshing with the ring gear 10 is good. Also, magnet switch 3
If the voltage applied to the coil is large, the one-way clutch 2
Since the speed difference between the movable iron core 5 and the movable iron core 5 becomes too large, the spring 6 is bent, and the main contact in the switch 3 is closed before the pinion gear 2b comes into contact with the ring gear 10.
There is a possibility that the pinion gear 2b may come into contact with the ring gear 10 while maintaining a sufficient rotation speed, resulting in poor meshing.

[0008]

In order to achieve the above-mentioned object, the present invention has a movable iron core, a magnet switch for attracting and driving the movable iron core by energization, and one end of the movable iron core without a spring. A shift lever to which parts are connected, a shaft that has a spline at its end and is driven to rotate, a first spline that engages with the spline of the shaft at one end, and a second spline at the other end. The one-way clutch that has rotation transmitted from the one end side to the other end side and is axially driven by the other end portion of the shift lever, and the second spline of the one-way clutch. A pinion gear that has a mating spline and that meshes with the engine side ring gear, and is provided between the one-way clutch and the pinion gear, and constantly presses the pinion gear. Have a spring are, configured to include a.

[0009]

According to the present invention configured as described above, since the pinion gear contacts the ring gear and does not push out the entire clutch when biting, only the pinion gear is pushed in, so the weight to be pushed in is greatly reduced. In addition, the spring force and the attraction force of the magnet switch can be greatly reduced, and the magnet switch can be downsized.

Also, when the clutch is pushed out, the movable iron core slides the one-way clutch without passing through the spring, so that the main contact does not close before the pinion gear comes into contact with the ring gear, and the meshing with the ring gear is good. You can

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially broken view of the starter. A straight spline 10a is formed on the shaft 10b of the armature 10 of the motor.
The straight spline 110b of the cylindrical body 110a is attached to 0a so as to overlap. Reference numeral 20 denotes a roller clutch as a one-way clutch, which includes a clutch outer 110 integrally formed with a cylinder 110a, a clutch inner 90 and a clutch outer 110 surrounding the shaft 10b.
And a roller 80 between the clutch inner 90 and.

Reference numeral 90a is a tube integrally formed with the clutch inner 90, and is provided on the shaft 10b so as to be movable back and forth via a bush 90b. A twist spline 90c is formed at the tip, and the twist spline 90c is formed.
The twist spline 70a of the pinion gear 70 is attached to c so that it overlaps. Also, the twist spline 9
A groove portion is formed on 0c, and a stopper 140 for restricting movement of the pinion gear 70 in the engine side ring gear 100 direction is fitted in the groove portion. The pinion gear 70 is movable back and forth and meshes with the ring gear 100.

Reference numeral 60 denotes a tube 90 of the one-way clutch 20.
The retaining washer and the coil spring provided between the pinion gear 70 and 120 are constantly pressing the pinion gear 70. Reference numeral 30 is a magnet switch, and the movable iron core 50 can be moved in the left-right direction (front-back direction) in the drawing by passing a current through a coil inside the switch 30. Reference numeral 40 denotes a shift lever, and one end 50a of the movable iron core 50 is connected to one end 40d of the lever 40.
The shift lever 40 is rotatable in both directions A and B in the directions of arrows A about a fulcrum 40a near the center of 0, and is connected to the other end 40c of the lever 40 in accordance with the rotation in both directions. 110a moves left and right (front and back) in the figure along the shaft 10b.

A cover 130 covers the clutch outer 110. Next, the operation of the above embodiment will be described. When an electric current flows through the coil in the magnet switch 30, the movable iron core 50 is attracted to the right (rear) of FIG.
The shift lever 40 rotates in the direction of arrow A about the fulcrum 40a. Therefore, the clutch 20 advances leftward on the shaft 10b. Also, due to the forward movement of the clutch 20,
The pinion gear 70 positioned so as to overlap the torsion spline 90c in the tube 90a also moves forward at the same time, and the end face of the pinion gear 70 is moved to the engine side ring gear 1
The forward movement of the pinion gear 70 is stopped by abutting against the end surface of 00, so that the movable iron core 50 is further attracted while bending the spring 60, and at the same time pushes out the roller clutch 20.

At that time, as shown in FIG. 3, as the roller type clutch 20 advances from the C position to the D position, the twist spline 70a of the pinion gear 70 which overlaps the twist spline 90c formed in the tube 90a of the roller type clutch 20, that is, The pinion gear 70 rotates from the A position to the B position. In this case, as shown in FIG. 4, the tooth end surface 100d of the tooth portion 100b of the ring gear 100 and the tooth end surface 70d of the tooth portion 70b of the pinion gear 70 contact at the position A, and the tooth portion 70b of the pinion gear 70 is rotated by the rotation of the pinion gear 70. Since the gears rotate to the B position, the contact between the gear end faces is released, and the pinion gear 70 is engaged with the ring gear 100 by the reaction force of the spring 60 shown in FIG.

After that, when the movable iron core 50 is attracted to a position where the main contact in the magnet switch 30 is closed, the starter rotates to drive the engine. Also, the clutch 20
The twisted spline 90c on the tube 90a of FIG.
As shown in, when the engine rotation speed exceeds the rotation speed of the armature 10 after engine ignition, a twisting spline is formed in a direction opposite to the rotation direction of the armature 20 so that the pinion 20 is easily given a force in the backward direction and is easily disengaged from the ring gear 100. Twisting.

At this time, the clutch 2 is attached to the pinion gear 70.
Since a force in the backward direction proportional to the force required in the idling direction of 0 (hereinafter referred to as idling torque) acts, the spring force of the spring 60 is set to be at least larger than this force. In addition,
In the present embodiment, since the spring 6 does not exist between the movable iron core 50 and the clutch 20 even when the pushing of the clutch 20 is started, the spring 6 is caused by the speed difference between the movable iron core 50 and the clutch 20 before the pinion gear 70 contacts the ring gear 100. The main contact of the flexible magnet switch 30 does not close, and the spline formed on the shaft 10b is engaged with the 110a of the clutch outer 110 by the direct spline 10a instead of the twisted spline, so sliding loss can be greatly reduced. The spring force of the spring 60 and the suction force of the switch 30 can be reduced.

In this embodiment, the one-way clutch is of the roller type, but as another example, the one-way clutch can be applied to a ratchet type, a sprag type or the like, but the roller type is effective because the idling torque can be reduced.

[Brief description of drawings]

FIG. 1 is a partial cutaway view illustrating a starter according to an embodiment of the present invention.

FIG. 2 is a partially cutaway view illustrating a conventional starter.

FIG. 3 is a conceptual diagram for explaining the operation of the above embodiment.

FIG. 4 is a conceptual diagram for explaining the operation of the above embodiment.

[Explanation of symbols]

 10a Spline 10b Shaft 20 Clutch 30 Magnet switch 50 Movable iron core 60 Spring 70 Pinion gear 70a Spline 90 Clutch inner 90a Tube 100 Ring gear 110 Clutch outer 110a Cylindrical 110b Spline

Claims (3)

[Claims] 1. A magnet switch having a movable iron core, which attracts and drives the movable iron core when energized, a shift lever whose one end is connected to the movable iron core without a spring, and a spline at the end. A shaft that is rotationally driven and a first spline that engages with a spline of the shaft are provided at one end side and a second spline is provided at the other end side, and rotation from the one end side is transmitted to the other end side. A pinion gear that has a one-way clutch that is axially driven by the other end of the shift lever, and a spline that engages with the second spline of the one-way clutch, and that meshes with an engine-side ring gear; A spring that is provided between the one-way clutch and the pinion gear and constantly presses the pinion gear; Data. 2. The starter according to claim 1, wherein the first spline of the one-way clutch is a straight spline, and the second spline is a torsion spline. 3. The starter according to claim 1, wherein the spring between the one-way clutch and the pinion gear is arranged on the outer periphery of the other end of the one-way clutch.