JP2701458B2 - Starter - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starter, and more particularly, to a structure of a compact starter with small driving noise.

2. Description of the Related Art As a starter of a vehicle engine, a so-called deceleration type starter is used, an example of which is shown in FIG. In the figure, the starter includes a magnet switch 5 and a motor 4 provided on the magnet switch 5. A drive gear 41 is fixed to a rotating shaft of a motor armature 42 and integrally rotates.

The magnet switch 5 has a plunger 51 that operates when the coil 52 is energized.
The tip of 51 is in contact with a pinion shaft (not shown) provided inside the clutch mechanism 6. The pinion shaft is provided so as to be able to move back and forth in the clutch mechanism 6, and a pinion gear 71 is mounted at the end thereof.

The drive gear 41 meshes with a large-diameter clutch gear 61 provided on the outer periphery of the clutch mechanism 6 via the idle gear 1, and the high-speed rotation of the drive gear 41 is changed to a low-speed high-torque rotation by the clutch gear 61. The signal is converted and transmitted to the pinion gear 71 via the clutch mechanism 6.

When the magnet switch coil 52 is energized, the plunger 51 advances, and accordingly, the pinion shaft advances, and the pinion gear 71 meshes with a ring gear provided on an unillustrated engine crankshaft. The advancement of the plunger 51 closes the motor energizing contact 53, rotates the armature 42, transmits its rotational force to the pinion gear 71, rotates the ring gear, and starts cranking.

When the engine starts, the pinion gear 71 is reversely driven at a high speed, but its rotational force is not transmitted to the armature 42 by the clutch mechanism 6. Thus, when the energization of the magnet switch coil 52 is stopped, the plunger 51 and the pinion shaft retreat, the meshing between the pinion gear 71 and the ring gear is released, and the motor energizing contact 53 opens to stop the rotation of the armature 42.

[Problems to be Solved by the Invention] In the conventional starter described above, the high-speed rotation of the drive gear is transmitted to the clutch gear by one idle gear, and a large torque is applied to the gear meshing portion because the meshing ratio is small. However, there is a problem that a relatively large driving sound due to tooth noise or the like is generated due to high-speed rotation in this state.

The starter provided with one idle gear is disclosed in
No. 185871.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a starter in which driving noise generated in a portion from a drive gear to a clutch gear is significantly reduced.

[Means for Solving the Problems] A drive gear 41 fixed to a rotating shaft of a motor armature 41 (FIG. 4), a clutch gear 61 provided in the clutch mechanism 6, and a portion between the drive gear 41 and the clutch gear 61. The idle gear 1 which meshes with these gears 41 and 61
Rotational force is received from the clutch gear 61 via the clutch mechanism 6, and a pinion shaft 7 (FIG. 3) having a pinion gear 71 attached to the tip thereof, and the pinion shaft 7 is advanced to connect the pinion gear 71 to the engine crankshaft. A starter including a magnet switch 5 having a plunger 51 meshed with a ring gear is provided with a pair of the idle gears 1A and 1B (FIGS. 1 and 2).
These idle gears 1A and 1B are shared by common holding plates 21 and 22.
Respectively, and the holding plates 21 and 22 are rotatably supported by the starter housing 3 (FIG. 3) at an intermediate position between the idle gears 1A and 1B. The idle gears 1A and 1B meshing with the clutch gear 61 are reciprocally swingable.

[Operation] In the starter having the above configuration, the rotation of the drive gear 41 is transmitted by the pair of idle gears 1A and 1B, and the torque applied to each meshing portion is reduced by half due to the increase in the meshing ratio. It does not emit loud driving noise. Further, since the applied torque of each meshing portion is reduced by half, the thickness of each gear 41, 1A, 1B, 61 is also reduced to approximately half, and the axial length of the starter is reduced accordingly.

The pair of idle gears 1A and 1B are supported on the rotatable holding plates 21 and 22 and can swing reciprocally relative to each other. Engage evenly.

[Embodiment] In FIG. 3, the torque of the motor 4 constituting the starter is transmitted from the drive gear 41 to the clutch gear 61 via the idle gear 1A (only one is shown), and is transmitted to the clutch gear 61. The rotational force is transmitted via the clutch mechanism 6
The power is transmitted to a pinion gear 71 mounted on the tip of the pinion shaft 7. The back and forth movement of the pinion shaft 7 is performed by the plunger of the magnet switch 5 as in the above-described conventional example.

As shown in FIG. 1, the idle gears 1A, 1B are provided between the drive gear 41 and the clutch gear 61, and are provided as a pair of left and right gears, and mesh with the respective gears 41, 61, respectively. These idle gears 1A and 1B are
1, 22 (FIG. 2) are rotatably supported. The holding plates 21 and 22 are plate members having both ends formed in a circular shape having substantially the same diameter as the idle gears 1A and 1B. ,
24 supports the idle gears 1A and 1B.

Shafts 211 and 221 are formed at the center of the front and rear surfaces of the holding plates 21 and 22, respectively.
1 and 221 are rotatably supported by the starter housing 3 (FIG. 3), and the holding plate is centered on the shafts 211 and 221.
21 and 22 are swingable.

In the starter having the above structure, the rotational force of the drive gear 41 is transmitted to the clutch gear through the pair of idle gears 1A and 1B.
It is transmitted to 61. By providing the pair of idle gears 1A and 1B, the drive gear 41 and the clutch gear 61 have meshing portions at two locations in the circumferential direction, and as a result, the meshing ratio increases, and the torque received by each meshing portion is the conventional torque. Almost halved.

Therefore, the drive gear 41 and the idle gear
Even if 1A and 1B rotate at a high speed, the driving noise due to toothing and the like is sufficiently small. Further, since the torque received by the meshing portion is reduced by half, the strength of each gear 41, 1A, 1B, 61 can be reduced, and the gear thickness can be reduced to almost half to shorten the length in the starter axial direction. It is possible. Even if a pair of idle gears 1A and 1B are provided, as shown in FIG.
The diameter is substantially within the motor diameter, and the overall diameter of the starter does not increase.

Further, during the rotation transmission process, each idle gear 1
Since A and 1B are reciprocally swingable, one of the idle gears 1A and 1B is a drive gear without any bias.
The gear 41 and the clutch gear 61 are uniformly meshed.

[Effects of the Invention] As described above, the starter of the present invention can greatly reduce the drive noise due to the rattle between the gears transmitting the rotation to the pinion gear, and can further reduce the size of the starter body. is there.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a gear group including an idle gear, which is a cross-sectional view taken along line II of FIG. 3, FIG. 2 is a plan view of the idle gear, and FIG. The figure is a cutaway side view of the starter, and FIG. 4 is a cutaway perspective view of the internal structure of the conventional starter. 1A, 1B Idle gear 21, 22 Holding plate 23, 24 Shaft member 211, 221 Shaft 3 Starter housing 4 Motor 41 Drive gear 5 Magnet switch 51 Plunger 6 Clutch mechanism 61 Clutch gear 7 Pinion shaft 71 Pinion gear

Claims (1)

(57) [Claims] A drive gear fixed to a rotating shaft of a motor; a clutch gear provided in a clutch mechanism; an idle gear interposed between the drive gear and the clutch gear to mesh with the gears; A pinion shaft receiving a rotational force from the clutch gear through the pinion, and having a pinion gear mounted on the tip thereof, and a magnet switch provided with a plunger therein for allowing the pinion shaft to advance and meshing the pinion gear with a ring gear of an engine crankshaft. In the starter, a pair of the idle gears is provided, these idle gears are rotatably supported on a common holding plate, and the holding plate is rotatably mounted on the starter housing at a center position between the two idle gears. Support the drive gear and Starter, characterized in that the enabling reciprocally oscillating moving the respective idle gear that meshes with the clutch gear.