JPH0610812A - Starter - Google Patents

Abstract

PURPOSE:To prevent a magnet switch from becoming large by providing a torque transmission means for connecting and disconnecting a pinion shaft integrated with a pinion for rotation, to and from a starter motor drive shaft. CONSTITUTION:A pinion 1 and an engine ring gear 2 are always engaged with each other. A driven side disc 302 having a driven side ratchet gear 303 is formed at one end of a pinion shaft 3 as integral part thereof. A driving side disc 4 having a driving side ratchet gear 401 is supported on an armature shaft 501 in such a way as slidable and incapable of rotation. When a key switch is turned on, the driving side ratchet gear 401 comes to gear with the driven side ratchet gear 303, thereby transmitting the torque of the armature shaft 501 to the pinion shaft 3. According to this construction, damage or the like due to the collision of the ring gear 2 with the pinion 1 is prevented, thereby extending service life and eliminating a chamfering work for better engagement.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a starter.

[0002]

2. Description of the Related Art In a conventional starter, the pinion of the starter is pushed out toward a ring gear of an engine by the attraction force of a magnet switch and meshed with the ring gear.

[0003]

However, in the above-mentioned conventional structure in which the ring gear and the pinion are meshed with each other, there are variations in meshability, and in order to obtain good meshability, the suction force of the magnet switch is to be obtained. increase of,
It is necessary to take measures such as increasing the stroke of the movable iron core in the magnet switch, which causes a problem that the magnet switch becomes large.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a structure in which a ring gear and a pinion are constantly meshed with each other, and at the time of starting, the driving force of a motor and a pinion are generated by the attraction force of a magnet switch. A torque transmission means is provided which is coupled to the shaft to transmit the torque of the motor to the ring gear and separates the drive shaft of the motor and the pinion shaft after starting to disable torque transmission between the motor and the engine. It is a thing.

[0005]

When the engine is driven, the torque transmission means connects the drive shaft of the motor and the pinion shaft, and the torque of the motor can be transmitted to the pinion. Since this pinion constantly meshes with the ring gear of the engine, the torque of the motor can be transmitted to the ring gear.

[0006]

As described above, in the starter of the present invention, since the ring gear and the pinion are always meshed with each other, the ring gear and the pinion do not collide with each other as in the conventional case, and the ring gear and the pinion are not damaged by the collision. It is possible to prevent it and it is excellent in terms of life, and it is excellent in manufacturing because it does not require chamfering of the ring gear and pinion to improve the meshing. Considering the variation in the positional relationship between the ring gear and the pinion and the meshing property due to the gear specifications. Torque can be reliably transmitted from the motor to the ring gear.

[0007]

EXAMPLES Examples of the present invention are shown below. [First Embodiment] FIG. 1 is a sectional view showing a starter having a structure in which a ratchet gear is used as a torque transmitting means in the present invention. The pinion 1 and the ring gear 2 of the engine always mesh with each other. A pinion knurl 101 is formed on the inner circumference of the pinion 1, and a pinion shaft knurl 30 is formed on the outer circumference of the pinion shaft 3.
1 are formed and these are fitted together. Both ends of the pinion shaft 3 are supported by bearings and are rotatable with respect to the housing 9. A driven-side disk 302 having a driven-side ratchet gear 303 formed therein is integrally formed at one end of the pinion 30.

Armature shaft 501 of armature 5
Has a spline 502 on the pinion 1 side. The driving side disk 4 on which the driving side ratchet gear 401 is formed is the cylindrical portion 4.
02, and a spline 403 is formed on the inner circumference of the cylindrical portion 402. The spline 403 and the spline 502 are engaged with each other, and the driving-side disc 4 is slidably and non-rotatably held by the armature shaft 501. Ratchet gear 4 of drive side disk 4
01 meshes with the ratchet gear 303 of the driven disk 302.

The lever 6 is swingably supported by a support shaft 601. A bifurcated connecting portion 602 is formed at one end of the lever 6, and holds the tubular portion 402. On the other hand, the connecting portion 603 at the other end of the lever 6 is connected to the connecting portion 702 of the movable iron core 701 of the magnet switch 7.

Next, the operation will be described. When a key switch (not shown) is turned on, a current flows through a coil (not shown) in the magnet switch 7, the movable iron core 701 is attracted and moves backward (to the right in the figure). Along with the movement of the movable iron core 701, the lever 6 swings and pushes the driving side disk 4 toward the driven side disk 3. And ratchet gear 4
When 01 meshes with the ratchet gear 303, the torque of the armature shaft 501 can be transmitted to the pinion shaft 3. When a contact (not shown) of the magnet switch 7 is closed, the armature 5 rotates, the torque thereof is transmitted to the ring gear 2 via the pinion 1, and the engine is driven. When the rotation speed of the engine becomes higher than the rotation speed of the armature 5, the ratchet gear slips and acts so that torque is not transmitted from the engine to the armature 5 (overrun prevention).

[Second Embodiment] FIG. 2 is a cross-sectional view showing a starter of the present invention in which a friction plate and a one-way clutch are used as torque transmitting means. The configuration other than the torque transmitting means is the same as that of the first embodiment, and the description thereof will be omitted.

The friction plate 10 comprises a driven side friction plate 1001 and a driving side friction plate 1002.
1 is integrally formed with one end of the pinion shaft. The driving side friction plate 1002 is integrally formed at one end of the inner shaft 1101 of the one-way clutch 11. Outer 1102 of one-way clutch 11 and inner shaft 1
A roller is arranged between the outer member 11 and
The torque can be transmitted only from the 02 side to the inner shaft 1101 side. A tubular portion 1103 is integrally formed with the outer 1102, and the spline 110 of the tubular portion 1103 is formed.
4 and the spline 502 of the armature shaft 501 are engaged with each other. One end of the lever 6 sandwiches the outer 11.

Next, the operation will be described. When a key switch (not shown) is turned on, a current flows through a coil (not shown) in the magnet switch 7, the movable iron core 701 is attracted and moves backward (to the right in the figure). The lever 6 swings with the movement of the movable iron core 701, and the driving side friction plate 1102 passes through the outer 1102 and the inner shaft 1101.
Is brought into contact with the driven side friction plate 1001 and the torque of the armature shaft 501 can be transmitted to the pinion shaft 3 via the one-way clutch 11. According to the second embodiment, overrun is prevented by the one-way clutch 11.

[Third Embodiment] FIG. 3 is a sectional view showing a starter having a structure in which a magnet clutch and a one-way clutch are used as torque transmitting means in the present invention.

The magnet clutch 12 includes a coil 120.
1, driven side clutch plate 1202, driving side clutch plate 12
03 and a return spring 1204. The coil 1201 is arranged on the outer periphery of the outer 1102 of the one-way clutch 11 so that the coil 1201 is arranged on the outer periphery of the iron plate 120.
It is fixed to the housing via 5. The driven side clutch plate 1202 is the outer side 11 of the one-way clutch 11.
It is fixed to one end of 02 by a bolt 1206. The driving side clutch plate 1203 has a tubular portion 1208, and a spline 1207 formed on the inner circumference of the tubular portion 1208 engages with the spline 502 of the armature shaft 501. The return spring 1204 has both clutch plates 12
01 and 1202 are urged to be isolated.

The energization of the starter motor is controlled by a relay (not shown), the coil of this relay and the coil 1201 of the magnet clutch 12 are connected in parallel, and both coils are turned on by turning on the key switch. It is energized at the same time.

Next, the operation will be described. Turn on the key switch
Then, a current flows through the coil 1201 of the magnet clutch 12, the driving-side clutch plate 1203 is attracted and moves forward (to the left in the drawing), and is attracted to the driven-side cuff latch plate 1202, so that the torque of the armature shaft 501 is increased. 3 is ready to be transmitted. At the same time, the coil of the relay that controls the energization of the starter motor is energized, a current flows through the armature 5, and the armature 5 generates torque. Therefore, the torque generated in the armature 5 is transmitted to the ring gear 2 via the pinion 1 to drive the engine. In the third embodiment, as in the second embodiment, overrun is prevented by the one-way clutch 11.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the device of the present invention.

FIG. 2 is a sectional view showing a second embodiment of the device of the present invention.

FIG. 3 is a sectional view showing a third embodiment of the device of the present invention.

[Explanation of symbols]

 1 Pinion 2 Ring Gear 3 Pinion Shaft 302 Driven Disk (Torque Transmission Means) 4 Driven Disk (Torque Transmission Means) 5 Armature 501 Armature Shaft

Claims (1)

[Claims] 1. A pinion which is always connected to a rotating shaft of an engine, a pinion shaft which is rotatably arranged in a housing and rotates integrally with the pinion, and a starter motor which is arranged in the pinion shaft and the housing. And a torque transmission means for connecting and disconnecting the drive shaft of the starter.