JPH09195905A - Starter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a starter having the outside diameter of an existing motor, using parts of the existing motor, and having a simple structure in which a magnet switch is not projecting outside the motor. SOLUTION: A magnet switch 6 is arranged on the opposite side to a pinion 3 of a motor 2. When the magnet switch 6 is electrified, a plunger 22 is axially moved. This plunger 22 is connected to one end 5a of a lever 5 through a connecting means 31 passing through a clearance of a fixed magnetic field 12. When the plunger 22 is axially moved, the other end 5b of the lever 5 pushes a pinion moving body 4 to a ring gear side. Since the magnet switch 6 is arranged on the opposite side to the pinion 3 of the motor 2, and also since the connecting means 31 passes through the fixed magnetic fields 12, the magnet switch 6 is prevented from projecting outside, the existing motor 2 can be used, and the structure can be simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starter for rotating a ring gear of an engine to start the engine.

[0002]

2. Description of the Related Art A starter directly attached to an engine must be arranged so as not to interfere with the engine or auxiliary equipment attached to the vehicle. The starter includes a motor that rotationally drives the pinion, a drive unit that meshes the pinion with a ring gear, and a magnet switch that operates the drive unit. The motor and the magnet switch are provided on the parallel shaft.

When mounting the starter on the engine with a motor as a reference, the magnet switch is rotated at various angles to find a portion without interference. However, if auxiliary devices and the like are arranged around the motor and the mounting angle cannot be found due to the interference of the magnet switch, a large layout change such as engine layout change is unavoidable.

As a means for avoiding the interference of the magnet switch, the technique disclosed in Japanese Patent Laid-Open No. 63-90665 is known. A magnet switch with the motor shaft (armature) and the switch shaft (plunger) coaxial with each other is arranged on the anti-pinion side of the motor, and inside the motor shaft,
A push-out mechanism of a drive unit for transmitting the movement of the switch shaft to the pinion is provided.

[0005]

SUMMARY OF THE INVENTION The technique disclosed in the above publication has the disadvantage that the structure of the starter becomes complicated, for example, the motor shaft is hollow and the push-out mechanism of the drive unit is arranged inside the motor shaft. As the diameter of the shaft increases, the outer diameter of the motor also increases. As a result, conventional motors (magnet switch and parallel shaft type) do not interfere with the engine when it is installed based on the outer diameter. There is a problem that cannot be avoided.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a starter having a simple structure and excellent vehicle mountability.

[0007]

The starter of the present invention employs the following technical means. [Means for Claim 1] By adopting claim 1, the following effects are achieved. When the starter operates, the magnet switch moves the internal plunger in the axial direction. When the plunger moves in the axial direction, the lever connected to the plunger via the connecting means rotates by receiving the moving force from the connecting means. Then, the pinion moving body moves to the ring gear, and the pinion meshes with the ring gear.

According to the starter of the first aspect of the present invention, which has the above-described operation, the magnet switch is provided on the side opposite to the pinion of the motor, and the connecting means for transmitting the moving force of the plunger to the pinion moving body is provided outside the armature. Does not need to be hollow, the motor can have the existing motor outer diameter, and the magnet switch does not project to the outside of the motor. As described above, since the starter having the existing motor outer diameter can be configured, the mountability of the starter in the engine room with many restrictions is improved.

Further, as shown in the prior art publication, a starter having a simple structure does not require a complicated structure such as a hollow motor shaft and an extrusion mechanism of a drive unit arranged therein. You can As described above, by simplifying the starter, the failure probability is reduced and the assemblability is excellent.

[Means for Claim 2] By adopting claim 2, the following effects are obtained. Since the magnet switch is provided on the side opposite to the pinion of the motor and eccentrically with respect to the axis of the armature, a space is formed in the axial projection of the motor on the radially outer side of the magnet switch. By disposing the battery terminal connected to the battery in that space, the axial dimension of the starter can be shortened.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a starter of the present invention will be described based on an embodiment shown in the drawings. [First Embodiment] FIG. 1 shows a first embodiment and is a side sectional view of a starter.

(Schematic Configuration of Starter 1) The starter 1 is
A motor 2 that is attached to a vehicle running engine (not shown) of an automobile to start the engine, and that generates a rotation output when energized and a pinion 3 that can mesh with a ring gear (not shown) of the engine. It has a pinion moving body 4 that it has, a lever 5 for moving this pinion moving body 4 to the ring gear side, and a magnet switch 6 provided on the side opposite to the pinion 3 of the motor 2.

(Description of Motor 2) The motor 2 is provided with a cylindrical yoke 11, a fixed field 12 fixed to the inner circumference of the yoke 11, and a rotatable inner field of the fixed field 12. The armature 13 is well-known, and the armature 13 is rotated by the magnetic force generated by the fixed field 12 and the magnetic field generated by the rotating field of the armature 13, and the rotational force is transmitted via the motor shaft 14 of the armature 13. It is transmitted to Pinion 3.

(Description of Pinion Moving Body 4) The pinion moving body 4 engages with the pinion 3 capable of meshing with the ring gear and the motor shaft 14 by a spline so that the pinion 3 moves in one direction (engine starting direction). The one-way clutch 15 rotates only.

The pinion 3, which is driven by the motor 2 via the one-way clutch 15, is provided so as to be rotatable on the motor shaft 14 and slidable along the motor shaft 14.

The one-way clutch 15 engages with the motor shaft 14 via a spline, is slidable along the motor shaft 14, and is rotationally driven by the motor shaft 14, and transmits its rotational force to the pinion 3. Then, when the rotation of the ring gear of the engine is rotated faster than the rotation of the pinion 3 and a torque reverse to that at the time of starting is applied to the pinion 3, this reverse rotation torque is released and the motor 2 is reversely driven by the ring gear. To be prevented.

(Description of Lever 5) The lever 5 is supported rotatably around a fixed shaft 17 in a housing 16 that houses the pinion moving body 4. One end 5a of the lever 5 is provided so as to be rotationally driven to the magnet switch 6 side by a connecting means (described later),
When the one end 5a is rotated toward the magnet switch 6, the other end 5b of the lever 5 is rotated so as to push the one-way clutch 15 toward the ring gear. That is, one end 5a of the lever 5
When is rotated to the side of the magnet switch 6, the other end 5b pushes the one-way clutch 15 toward the ring gear side, and the pinion 3 is provided so as to mesh with the ring gear.

(Description of Magnet Switch 6) The magnet switch 6 is concentrically provided on the side of the motor 2 opposite to the pinion 3. This magnet switch 6
A plunger 2 made of a magnetic material that encloses a switch coil 21 that generates an electromagnetic force by being energized by a starter switch (not shown) and that is attracted by the electromagnetic force generated by the switch coil 21 and moves in the axial direction inside the switch coil 21.
Includes 2. The plunger 22 is constantly urged toward the pinion 3 by the return spring 23.

A movable contact 24 that moves integrally with the plunger 22 is provided at one end 22b of the plunger 22. When the plunger 22 moves in the axial direction, the movable contact 2
4 is brought into contact with two fixed contacts (battery terminal 26 and motor terminal 27) fixed to the insulating rear cover 25. The movable contact 24, the battery terminal 26, and the motor terminal 27 are used to turn on and off the motor 2.
Is configured. The battery terminal 26 is a terminal connected to an in-vehicle battery (not shown) via a battery cable (not shown), and the motor terminal 27 is a terminal connected to the motor 2.

(Description of Connecting Means 31) The magnet switch 6 is passed through a gap (not shown) between the fixed fields 12, and connects the other end 22a of the plunger 22 and one end 5a of the lever 5. And a connecting means 31 for transmitting the moving force of the plunger 22 to the one end 5a of the lever 5.

The connecting means 31 is, for example, an L-shaped metal plate, and when the plunger 22 moves in the axial direction, the connecting means 31 also moves while maintaining the L-shape, and the one end 5a of the lever 5 is counter-ringed. The lever 5 is rotated to the other end 5 of the lever 5.
b is rotated to the ring gear side. When the switch coil 21 is turned off and the plunger 22 is pushed back to the pinion 3 side by the action of the return spring 23,
The connecting means 31 also moves to the pinion 3 side, rotates one end 5a of the lever 5 to the ring gear side, and returns the other end 5b of the lever 5 to the opposite ring gear side.

When the connecting means 31 is formed of an L-shaped metal plate as shown in this embodiment, the plunger 2 is used.
It may be formed of a metal plate having high strength so that the L-shape is not deformed by the movement of 2, or the bent portion may be reinforced by providing a rib or the like. Also, even if the L-shape is slightly deformed,
The movement of the plunger 22 in the axial direction is controlled by one end 5a of the lever 5.
If it can be sufficiently transmitted to the L-shape, the L-shape may be deformable within an allowable range.

Further, in this embodiment, the connecting means 31 is set to L
An example in which the pinion 3 is formed of a V-shaped metal plate is shown, but one end 5a of the lever 5 is moved by a predetermined amount by moving the plunger 22 in the axial direction (the pinion moving body 4 is moved by a predetermined amount so that the pinion 3 meshes with the ring gear by a predetermined amount). A wire-shaped member may be used as the connecting means 31 as long as it can rotate.

(Operation of Embodiment) Next, the operation of the starter 1 of this embodiment will be described. A starter switch not shown
When it is turned on and the switch coil 21 is energized to generate an electromagnetic force, the electromagnetic force causes the plunger 22 to move in the axial direction. Then, the connecting means 31 also moves to the anti-pinion 3 side, and the one end 5a of the lever 5 rotates to the anti-ring gear side. By this rotation of the lever 5, the other end 5b of the lever 5
Rotates to the ring gear side, and the other end 5b of the lever 5 moves the pinion moving body 4 to the ring gear side.

When the pinion moving body 4 moves to the ring gear side, the pinion 3 meshes with the ring gear. On the other hand, by moving the plunger 22 in the axial direction,
The movable contact 24 has a battery terminal 26 and a motor terminal 27.
And the motor 2 is turned on. As a result, the motor 2 starts rotating. Thus, when the motor 2 rotates, the rotation of the motor shaft 14 causes the one-way clutch 15 and the pinion 3 to rotate.
Is transmitted to the ring gear via.

When the engine starts and the ring gear of the engine rotates faster than the rotation of the pinion 3, the one-way clutch 15 receives a torque in the reverse rotation to that at the time of engine start, so that the one-way clutch 15 reverses. The rotation torque is released, and the ring gear prevents the motor 2 from being reversely driven.

When the engine is started, the starter switch is turned off by the occupant and the energization of the switch coil 21 is stopped. Then, the plunger 22 is returned to the pinion 3 side by the action of the return spring 23, the movable contact 24 is separated from the battery terminal 26 and the motor terminal 27, and the motor 2 is turned off.

When the plunger 22 is returned to the pinion 3 side, the connecting means 31 also moves to the pinion 3 side, and the one end 5a of the lever 5 rotates to the ring gear side. By this rotation of the lever 5, the other end 5b of the lever 5 rotates to the side opposite to the ring gear, and the other end 5b of the lever 5 returns to the original position.

In this way, when the other end 5b of the lever 5 returns to its original position, the pinion moving body 4 also moves to the side opposite to the ring gear and returns to its original position. That is, the pinion 3 and the ring gear of the engine are disengaged from each other and are returned before the starter 1 is started.

(Effect of Embodiment) According to this embodiment, since the connecting means 31 is passed through the space between the fixed field 12 of the motor 2, the motor shaft of the motor 2 is, as shown in the prior art publication. It is not necessary to make 14 hollow, the motor outer diameter can be the existing motor outer diameter, and the motor components used in the existing starter can be used almost as they are.

Further, since the magnet switch 6 is arranged on the side opposite to the pinion 3 side of the motor 2, the magnet switch 6 does not project radially outward of the motor 2.
As described above, since the starter having the existing outer diameter of the motor 2 can be configured, the mountability of the starter in the engine room with many restrictions is improved.

Further, since the connecting means 31 is passed through the space between the fixed field 12 of the motor 2, there is no need for a complicated structure such as hollowing the motor shaft 14 and arranging the pushing mechanism of the driving portion therein. The structure of the starter can be simplified.
As described above, by simplifying the structure of the starter, the failure probability is reduced and the starter is easily assembled.

[Structure of the Second Embodiment] FIG. 2 shows the second embodiment and is a side sectional view of the starter 1. In the starter 1 of the second embodiment, the magnet switch 6 arranged on the side of the motor 2 opposite to the pinion 3 is connected to the armature 1 of the motor 2.
3 is provided eccentrically with respect to the shaft of No. 3, and the battery terminal 26 is arranged in the space A within the axial projection of the motor 2 on the outer circumference of the magnet switch 6 in the radial direction. Are arranged at right angles.

In the second embodiment, the magnet switch 6 is located on the side opposite to the pinion 3 of the motor 2 and the armature 13 is provided.
By being provided eccentrically with respect to the axis of, the space A in the axial projection of the motor 2 on the outer circumference in the radial direction of the magnet switch 6 is formed. By disposing the battery terminal 26 in the space A in the direction perpendicular to the motor shaft 14, the overall length in the axial direction of the starter 1 can be shortened while suppressing the outer diameter dimension of the starter 1.

[Modification] The above embodiment shows an example in which the plunger 22 and the lever 5 are directly connected by the connecting means 31,
Although an example in which the movement of the plunger 22 is directly transmitted to the lever 5 is shown, a moving force absorbing means such as a spring for absorbing the moving force of one side is provided between the armature 13 and the lever 5, and the end face of the ring gear Even if the end face of the pinion 3 is in contact,
It may be provided so that the switch 28 of the magnet switch 6 can be turned on.

Although the example in which the rotation of the motor 2 is directly transmitted to the pinion 3 is shown, the rotation torque of the pinion 3 may be increased by interposing a speed reducing mechanism such as a planetary gear device. The fixed field 12 may be a field magnet that generates a magnetic force when energized or a permanent magnet.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a starter (first embodiment).

FIG. 2 is a side sectional view of a starter (second embodiment).

[Explanation of symbols]

 1 Starter 2 Motor 3 Pinion 4 Pinion Moving Body 5 Lever 6 Magnet Switch 12 Fixed Field 13 Armature 22 Plunger 26 Battery Terminal 31 Connecting Means

Claims (2)

[Claims] 1. A pinion moving body having a pinion that meshes with a ring gear of an engine, and an armature for imparting rotation to the pinion.
And a motor having a fixed field provided on the outer periphery of the armature, (c) a magnet switch provided on the side opposite to the pinion of the motor for supplying a current from the battery to the motor, and (d) the pinion. In a starter having a rotatably provided lever for moving a moving body to the ring gear side, a starter provided on an outer circumference of the armature and connected to the lever and a plunger included in the magnet switch. ,
A starter characterized by comprising a connecting means for rotating the lever by moving the plunger in the axial direction to move the pinion moving body to the ring gear. 2. The starter according to claim 1, wherein the magnet switch is provided on an anti-pinion side of the motor and eccentrically with respect to an armature shaft, and a motor shaft on a radially outer side of the magnet switch. A starter, characterized in that a battery terminal for connecting the battery is arranged in the directional projection.