JPH0733574Y2 - Coaxial type starter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a coaxial starter.

[Prior Art] Conventionally, as a starter of this type, for example, JP-A-51-6341
There is a starting electric motor for an internal combustion engine described in JP-A-1.

In this conventional technology, a bearing that supports a solid pinion shaft is provided on the inner surface of the armature shaft, and a brush holder that holds a brush that contacts the commutator in the housing of the electromagnetic switch is slidably supported on the guide arm. However, an electromagnetic switch is placed behind this brush holder.

[Problems to be Solved by the Invention] In the above conventional technology, the bearing and the holding mechanism of the brush holder are separately provided in the housing of the armature shaft and the electromagnetic switch, and the brush holder is supported by the guide arm. Because of this, the overall length becomes long and the structure becomes complicated.

[Means for Solving the Problem] The present invention is directed to a bearing for supporting a face-shaped commutator arranged at the rear portion of an armature and a hollow armature rotating shaft in order to shorten the overall length and simplify the structure. A brush holder made of resin for holding a brush in contact with the commutator, the brush housing being inserted into a plurality of support holes provided in a rear bracket for supporting a rod of a plunger provided behind the brush holder. An electromagnetic switch for pressing and urging the output rotating shaft, a movable contact which is energized by the electromagnetic switch and works in conjunction with the rod when moving forward so as to press and urge the output rotating shaft, and a rear surface of the brush holder. The movable contact provided and the fixed contact connected to the brush that comes into contact when the rod moves are provided, and the movable contact and the fixed contact are connected by energizing the electromagnetic switch. It is an object of the present invention to provide a coaxial starter characterized in that a constant contact comes into contact with the brush and the brush is energized to rotate the armature.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First
The figure shows a cross-sectional view of the main part of a coaxial starter, 1 is an armature of a DC motor, 2 is a hollow armature rotating shaft, and a face commutator 3 is supported behind the armature 1. Reference numeral 4 denotes a brush, which is inserted into a brush housing 4b of a resin brush holder 4a via a spring 4c. 6a has a plurality of support holes at the bottom as shown in FIG. 2 so that the brush holder 4a can be inserted.
The rear bracket 6b is opened, and the brush accommodating portion 4b of the brush holder 4a is inserted into the support hole 6b from the rear of the rear bracket 6a. A bearing 7 supports the armature rotating shaft 2 and is supported by the rear bracket 6a. Reference numeral 32 is a fixed contact attached to the bottom of the brush holder 4a, and 26 is an electromagnetic switch for urging the rod 30b of a brandier (not shown) against the output rotary shaft 16 via the ball 19 and is arranged behind the rear bracket 6a. Has been done. Reference numeral 8 is a yoke of the DC motor, and 8a is a permanent magnet for generating a field of the armature 1.

In the coaxial starter configured as described above, when the key switch is closed, the electromagnetic switch 26 is energized to move the rod 30b forward (to the right), and the movable contact (not shown) displaced by the movement of the rod 30b. Contact the fixed contact 32. As a result, the brush 4 connected to the fixed contact 32 by a lead wire is energized, the armature coil 3a is energized through the commutator 3, and the armature 1 rotates. The rotational force of the armature 1 is reduced by a planetary gear reduction mechanism (not shown) and transmitted to the overrunning clutch. On the other hand, the force of the rod 30b acts on the output rotary shaft 16 via the ball 19 in the armature rotary shaft 2, the output rotary shaft 16 moves forward (to the right), and is attached to the output rotary shaft 16. Engage the pinion with the ring gear.

Although the planetary gear reduction mechanism is provided in the embodiment, the planetary gear mechanism may be omitted if it is not necessary to reduce the speed of the output rotary shaft. Further, in addition to the permanent magnet 8a for generating the field of the electric motor, a coil may be wound around the magnetic pole core.

[Effects of the Invention] As described above, according to the present invention, the brush accommodating portion of the brush holder is inserted into the support hole of the rear bracket, the electromagnetic switch is arranged in the rear portion of the brush holder, and Since the fixed contact of the electromagnetic switch is provided on the rear surface, there is an effect that the total length of the starter can be shortened and can be made lightweight and compact.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a coaxial starter according to an embodiment of the present invention, and FIG. 2 is a perspective view of a brush holder, a rear bracket and an electromagnetic switch. 1 …… armature, 2 …… armature rotation axis, 3 …… commutator, 4
...... Brush, 4a …… Brush cage, 6a …… Rear bracket, 6b …… Support hole, 7 …… Bearing, 8 …… Yoke, 16 …… Output rotary shaft, 19 …… Ball, 26 …… Electromagnetic switch , 30b …… Rod, 32 …… Fixed contact. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A brush accommodating portion is inserted into a plurality of support holes provided in a rear bracket for supporting a face-shaped commutator arranged at a rear portion of an armature and a bearing for supporting a hollow armature rotating shaft. A brush holder made of resin for holding a brush that comes into contact with the commutator, an electromagnetic switch provided behind the brush holder for pressing and urging the rod of the plunger against the output rotation shaft, and the rod being energized by the electromagnetic switch. A fixed contact connected to a movable contact that interlocks with the output rotation shaft when moving forward so as to press the output rotation shaft, and a brush that is provided on the rear surface of the brush holder and that contacts the movable contact when the rod moves. With contact points,
A coaxial starter, wherein the movable contact and the fixed contact come into contact with each other when the electromagnetic switch is energized, and the brush is energized to rotate the armature.