JPH0644289Y2 - Starter motor grounding device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a grounding device for a starter motor, and in particular, it comprises an insulating center housing made of a synthetic resin molding, and the motor body is provided at one end of the center housing The pinion housing is mounted on the side opposite to the motor body with respect to the center housing, and the pinion slidably supported by the output shaft passing through the center housing is housed in the pinion housing. A grounding device for a starter motor.

[Outline of device]

According to the present invention, a through hole is formed in a center housing, a conductive brush is attached to the through hole, and a screw for pressing a ground terminal plate arranged so as to face the through hole is provided in the through hole. A brush is inserted and screwed into a female screw hole formed in the pinion housing. With this, the center housing made of a synthetic resin molded body insulates the power feeding portion and grounds the power feeding portion by the terminal plate. It was designed to be dropped on a pinion housing by screws and screws.

[Conventional technology]

To start the engine, the engine is equipped with a starter motor and has a pinion.
When the starter motor is driven, the pinion moves in the axial direction and meshes with the ring gear of the engine, and the engine is cranked and started via the ring gear.

[Problems to be solved by the invention]

When the center housing of such a starter motor is molded with a synthetic resin molded body, since the center housing itself has insulating properties, the center housing can also serve as insulation of the power feeding portion. However, if the center housing is made of an insulating synthetic resin, a new problem arises in that the power feeding portion provided on the center housing cannot be grounded via the center housing.

The present invention has been made in view of these problems, and in a starter motor in which a synthetic resin molded body that is an insulating material is used as a center housing, the ground of a power feeding portion provided on the center housing is used. It is an object of the present invention to provide a grounding device for a starter motor capable of reliably performing the above.

[Means for solving problems]

The present invention comprises an insulative center housing made of a synthetic resin molded body, a case of a motor body is attached to one end of the center housing, and a rotor is rotatably arranged in the case. The rotating shaft attached is passed through the through hole of the center housing, and the brush held by the brush holder provided at one end of the center housing is slidably contacted with the commutator attached to the rotating shaft. Then, power is supplied to the rotor side coil via the brush and the commutator, a metal pinion housing is attached to the other end of the center housing, and the other end of the center housing is connected to the rotary shaft of the rotary shaft. The pinion slidably supported at the tip is housed in the pinion housing, and the center housing is A power supply portion for supplying power to the rotor side coil is provided on one end side of the rotor, a through hole penetrating from one end side to the other end side of the center housing is provided in the center housing, and the through hole is electrically conductive. A conductive bush is mounted, and the grounding terminal plate of the power feeding portion, which is arranged so as to face the through hole on one end side of the center housing, is electrically connected to the pinion housing via the bush, and the conductive bush is inserted. In addition, the present invention relates to a grounding device for a starter motor, wherein the terminal plate is fixed to the center housing by a screw screwed into a female screw hole formed in the pinion housing.

[Action]

This motor is rotated by supplying power to the rotor side coil through a brush held by a brush holder provided in the center housing and a commutator attached to the rotating shaft. The rotation of the motor is taken out through the rotation shaft, and the pinion slidably supported on the tip end side of the rotation shaft rotates in the pinion housing and meshes with the ring gear of the engine to operate the engine. Start by ranking.

The power supply portion provided on the center housing at one end side of the center housing is dropped to the metal pinion housing side through a conductive bush inserted in a through hole provided in the center housing. And will be grounded by the pinion housing.

〔Example〕

The present invention will be described below with reference to an embodiment shown in the drawings. 3 and 4 show a vertical type starter motor according to an embodiment of the present invention. The starter motor includes a center housing 10 made of a synthetic resin molded body. A cup-shaped case 12 that also serves as a yoke is supported via a screw 11. A magnet 13 is fixed to the inner peripheral surface of the case 12 to form a stator. A rotor core 14 is arranged inside the magnet 13 and is fixed to a rotating shaft 15 so as to rotate together with the shaft 15. A coil 16 is wound around the stator core 14 via a bobbin 17.

The armature coil 16 wound around the rotor core 14 is connected to the commutator 18, and the commutator 18 is in sliding contact with the brush 19. The brush 19 is slidably supported by a brush holder 20, and a spring 21 is arranged in the brush holder 20. The spring 21 presses the brush 19 against the commutator 18. Therefore, the current is switched according to the rotation of the rotor coil 16.

A pinion housing 22 made of aluminum die casting is fixed to the upper part of the center housing 10, and a pinion 23 is arranged in the pinion housing 22. The pinion 23 is supported by the rotating shaft 15 via a one-way clutch 24. The one-way clutch 24 is connected to the rotating shaft 15 by a helical spline. The pinion 23 is pushed downward in FIG. 4 by the compression coil spring 25. The upper end of this spring 25 is a retainer 26 that also serves as a stopper.
To be received by.

Next, the structure of the ground of the power feeding portion provided on the center housing 10 will be described. As shown in FIG. 1, a pair of brush holders 20 are provided on the lower surface of the center housing 10 and the brush holder 20 does not exist. A through hole 29 is formed in the recess as shown in FIG. 2, and a conductive bush 30 is inserted into this through hole. In addition, on the upper part of this bush 30, a ground terminal plate 31
Are arranged. The terminal plate 31 has a corrugated washer 32 below it.
Along with it, it is designed to be held down by screws 33.
The screw 33 penetrates the bush 30 of the through hole 29 and is screwed into a female screw hole 34 formed in the pinion housing 22 arranged above the bush 30.

In the above configuration, when the armature coil 16 is energized through the brush 19 and the commutator 18, the motor rotates. This rotation is taken out by the rotating shaft 15, and the one-way clutch 24 and the pinion are
23 rotates together. Moreover, by this rotation,
The one-way clutch 24 is moved upward by the helical spline, and the pinion 23 comes into engagement with the ring gear of the engine. Therefore, with this motor the pinion
The engine will be cranked through 23,
This allows the engine to be started.

The power feeding portion to the rotor coil 16 of the motor for starting the engine in this manner is provided below the center housing 10 made of a synthetic resin molded body as described above. Since the center housing 10 is made of synthetic resin, which is an insulating material, it is necessary to ground this power supply section. Therefore, in this motor, a through hole 29 in which the conductive bush 30 is inserted is provided in the center housing 10, and the grounding terminal plate 31 and the wave washer are provided.
32 is arranged on the housing 10, and the screw 33 is inserted through the bush 30 and is screwed into the female screw hole 34 of the pinion housing 22 made of aluminum alloy, whereby the ground of the power feeding portion is grounded.
It has dropped to 22.

Therefore, according to such a starter motor, the insulation of the power feeding portion can be achieved by the center housing 10 itself made of a synthetic resin molded body. That is, there is no need to provide insulation for the brush holder 20 and the like. Further, since the ground of the power feeding portion insulated by the center housing 10 itself is dropped to the pinion housing 22 by the grounding terminal plate 31 and the screw 32, the grounding of the power feeding portion can be performed by the pinion housing 22. Become. The corrugated washer 32 is pressed against the conductive bush 30 by the screwing force of the screw 33.
Since 30 is pressed by the pinion housing 22, grounding is more surely performed by this, and it becomes possible to prevent a contact failure of grounding.

[Effect of device]

As described above, according to the present invention, the brush held by the brush holder provided on the one end side of the center housing is attached to the commutator of the rotary shaft to which the rotor in the case of the motor body on the one end side of the center housing is attached. It is brought into sliding contact with the motor so that the motor is rotated. Insulation of the power feeding portion of the motor, which feeds power to the coil of the rotor via the brush and the commutator, is achieved by the insulating center housing made of a synthetic resin molded body. Therefore, the insulation of the power supply of the motor is performed by the center housing itself, and the insulation structure is achieved very simply.

Further, the power feeding portion provided on the center housing is electrically connected to the pinion housing through the grounding terminal plate and the conductive bush that passes through the through hole of the center housing. Can be dropped into a metal pinion housing.
Moreover, since the grounding terminal plate for grounding the power feeding part is fixed by the screw that is inserted through the conductive bush and screwed by the female screw hole formed in the pinion housing, the grounding terminal is connected by this screw. It is possible to assist the conduction between the plate and the pinion housing and to reliably press the terminal plate.

Grounding is performed more reliably than when using a screw to ground because the conductive bush is inserted through the through hole provided in the center housing for grounding the power supply section. Will be done. Further, by inserting such a conductive bush into the through hole, even if the screw is tightened, no force is locally applied to the edge portion of the through hole, which makes it possible to protect the through hole. Become.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an essential part showing a grounding device for a starter motor according to an embodiment of the present invention, FIG. 2 is an enlarged longitudinal sectional view of the essential part, and FIG. 3 is a plan view of the starter motor. The figure is a vertical sectional view of the same. The names of each part in the drawings are as follows. 10 …… Center housing 11 …… Screw 12 …… Case (yoke) 13 …… Magnet 14 …… Rotor core 15 …… Rotating shaft (output shaft) 16 …… Coil 17 …… Bobbin 18 …… Commutator 19 …… Brush 20 …… Brush holder 21 …… Spring 22 …… Pinion housing 23 …… Pinion 24 …… One-way clutch 25 …… Compression coil spring 26 …… Retainer (stopper) 29 …… Through hole 30 …… Conductive bush 31… … Ground terminal plate 32 …… Wave washer 33 …… Screw 34 …… Female screw hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tsutomu Inui, 4-1 Chuo, Wako, Saitama Prefecture, Honda R & D Co., Ltd. (72) Creator: Toru Takeda, 1-1, Chuo, Wako, Saitama Stock Company Honda Technical Research Institute

Claims (1)

[Scope of utility model registration request] 1. An insulating center housing made of a synthetic resin molded body, wherein a case of a motor body is attached to one end of the center housing, and a rotor is rotatably arranged in the case. The rotating shaft attached is passed through the through hole of the center housing, and the brush held by the brush holder provided at one end of the center housing is slidably contacted with the commutator attached to the rotating shaft. Then, power is supplied to the rotor side coil via the brush and the commutator, a metal pinion housing is attached to the other end of the center housing, and the other end of the center housing is connected to the rotary shaft of the rotary shaft. The pinion slidably supported at the tip is housed in the pinion housing, and the center housing is A power supply portion for supplying power to the rotor side coil is provided on one end side of the rotor, a through hole penetrating from one end side to the other end side of the center housing is provided in the center housing, and the through hole is electrically conductive. A conductive bush is mounted, and the grounding terminal plate of the power feeding portion, which is arranged so as to face the through hole on one end side of the center housing, is electrically connected to the pinion housing via the bush, and the conductive bush is inserted. A grounding device for a starter motor, characterized in that the terminal plate is fixed to the center housing by a screw screwed into a female screw hole formed in the pinion housing.