CN1145452A

CN1145452A - Engine starter

Info

Publication number: CN1145452A
Application number: CN 95117714
Authority: CN
Inventors: 楠本启一; 古西启一
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 1995-09-14
Filing date: 1995-09-14
Publication date: 1997-03-19
Anticipated expiration: 2015-09-14
Also published as: CN1073209C

Abstract

An engine starter in which one of a front housing and a yoke has a projection, and the other of the front housing and the yoke have engaging portions engage the projection to prevent a rotative motion of the yoke. Thereby, a breakdown of through bolts, which is used for fixing the yoke to the front housing, by a shearing force is prevented.

Description

Engine starter

The present invention relates to a kind of engine starter, be used for motor car engine or its similar machine.

Fig. 7 is the sectional view of a traditional planetary reduction gear engine starter, and that is for example disclosed in Japanese patent publication number 5-28380 is the sort of.Among the figure, armature 1 have the axle 2, armature pinion 2a is arranged on it, an armature core 3 be fixed on the axle 2 on and armature coil be fixed on the armature core 3.Being fixed in the cylindrical york piece 5 of armature 1 on the perimeter surface is magnetic patch 5, and it is facing to the outer surface of armature 1.Motor 7 has armature 1, york piece and magnetic patch 6.In addition, Fig. 8 is the sectional view of the york piece 5 of Fig. 7.One hole is arranged at the bottom of york piece 5, and the axle 2 that is used to hold armature 1 is in wherein.

Motor 7 is connected with output shaft 9 by a planet reducing gear 8.Set overrunning clutch 10 and small gear 11 can to-and-fro motion on output shaft 9, thereby are meshed with the gear ring (not shown) of motor.Overrunning clutch 10 is connected with the movable core of lever 12 with magnetic switch 13.

York piece 5 and magnetic switch 13 are fixed on the front casing 15.Planetary gear speed reducing mechanism 8, output shaft 9, overrunning clutch 10, small gear 11 and lever 12 are arranged in the front casing 15.Rear casing 16 is fixed to the rear end (left end in the drawings) of york piece 5.In addition, york piece 5 is to be fixed on the front casing 15 with stay bolt 17.

Working procedure is described below.When magnetic switch goes to when connecting shelves, movable core 14 left in the figure moves, and makes electric current enter motor 7.With lever 12 swing of movable core mechanical link and make overrunning clutch 10 and small gear 11 along output shaft 10 towards figure in right slide.Like this, small gear 11 just is meshed with engine ring gear.

The rotation of motor 7 is delivered on the small gear 11 by planetary reducer 8, output shaft 9 and overrunning clutch 10, thereby pilots engine.After engine start, magnetic switch 13 goes to when disconnecting shelves, and movable core 14 moves back to its home position and the electric current of flow direction motor 7 is cut off.In addition, also retract its original position by lever 12 overrunning clutches 10, small gear 11 separates with gear ring simultaneously.

For the traditional engine starter that has said structure, york piece 5 just is fixed on the front casing 15 by stay bolt 17, so the vibration of motor can cause that york piece 5 is towards the sense of rotation activity and simultaneously stay bolt 17 can be crooked.The rotational motion of york piece 5 can make stay bolt 17 fractures when situation allows around.

Therefore, an object of the present invention is to provide a kind of engine starter, it can be avoided the rotational motion of york piece and be used for york piece is fixed to the destruction of the stay bolt on the front casing.

For achieving the above object, a kind of engine starter is provided, it comprises: a front casing; One motor, it comprises with stay bolt and is fixed to cylindrical york piece on the front casing, is fixed on the magnetic patch on the perimeter surface in the york piece, and is arranged at the armature in the york piece; Be arranged in the front casing and an output shaft that when the rotatory force of motor is passed over, rotates; A small gear, it can mesh and rotate when output shaft rotates with the gear ring engagement and the disengaging of motor; And a magnetic switch, be used to make the engagement of small gear and gear ring and break away from engagement also to make motor energising and outage; It is characterized in that one of front casing and york piece have projection, other front casing and york piece have the part that matches to agree with above-mentioned projection, thereby prevent the rotational motion of the aforementioned relatively shell of above-mentioned york piece.

Fig. 1 is the fragmentary sectional view as the engine starter of the first embodiment of the present invention;

Fig. 2 is the cross sectional view of york piece among Fig. 1;

Fig. 3 is the front view of the york piece of Fig. 2;

Fig. 4 is the viewgraph of cross-section along the front casing of IV-IV line among Fig. 1;

Fig. 5 is the front view as the york piece of the engine starter of the second embodiment of the present invention;

Fig. 6 is the partial cross-sectional view of second embodiment's front casing;

Fig. 7 is a kind of cross sectional view of an example of traditional engine starter;

Fig. 8 is the sectional view of the york piece among Fig. 7.

Fig. 1 is the fragmentary sectional view as the engine starter of the first embodiment of the present invention.Fig. 2 is the cross sectional view of the york piece of Fig. 1.Fig. 3 is the front view of the york piece of Fig. 2.Fig. 4 is the viewgraph of cross-section along the front casing of IV-IV line among Fig. 1.

In these figure, cylindrical york piece 21 has a protruding 21a, and at front casing 22 sides, promptly place, the end limit of bottom processes with the method for punching press.The front casing of being manufactured by metal 22 has a groove 22a in order to insert protruding 21a.Projection 21a matches with the two side of groove 22a, and these are mating part 22b, 22c.Constitute about the same among the primary component of engine starter and Fig. 7.

In this engine starter,, prevented the rotational motion of york piece 21 and be accurately positioned because the projection 21a of york piece 21 matches with mating part 22b, the 22c of front casing 22.Because the power towards sense of rotation is to be delivered to mating

part

22b, 22c from protruding 21a, has kept away shearing force and destroyed stay bolt 17 (Fig. 7).In addition, protruding 21a is formed by the part of punching press york piece 21, has avoided the increase of number of spare parts, and the expense of location york piece 21 has reduced.

Though a kind of protruding 21a is provided in above-mentioned first embodiment, also can provides two protruding 21a, as shown in Figure 5.Fig. 6 is the cross sectional view that is illustrated in the situation that is provided with of

mating part

22b, 22c among this second embodiment.

In addition, protruding 21a can be arranged on york piece 21 peripheries Anywhere, and in the place of york piece 21 more than three places.

Also have, though protruding 21a is arranged on the york piece 21,

mating part

22b, 22c are arranged on the front casing 22, can be arranged on projection on the front casing and mating part is arranged on the york piece.

Moreover, though the foregoing description with regard to planet geared-down engine starter motor, the present invention also can be applied on various types of engine starters.

Claims

1. engine starter comprises:

One front casing;

One motor comprises with stay bolt being fixed on cylindrical york piece on the above-mentioned front casing, is fixed on a magnetic patch on the perimeter surface and an armature that makes in above-mentioned york piece in the above-mentioned york piece;

One output shaft is arranged in the above-mentioned front casing and when the driving force of motor passes over and rotates;

One small gear, it can mesh with the gear ring engagement and the disengaging of motor, and rotates when above-mentioned output shaft rotates; With

One magnetic switch is used to make the engagement of above-mentioned small gear and above-mentioned gear ring and breaks away from engagement, and also can make above-mentioned motor energising and outage;

It is characterized in that one of above-mentioned front casing and above-mentioned york piece have a projection, and other above-mentioned projection is agreed with mutually in order to prevent above-mentioned york piece relatively rotating above-mentioned front casing.

2. according to a kind of engine starter of claim 1, it is characterized in that above-mentioned cylindrical york piece has a bottom, it has a hole, and the axle that is used to hold above-mentioned armature is in it, and above-mentioned projection forms in above-mentioned bottom with process for stamping.

3. according to a kind of engine starter of claim 2, it is characterized in that above-mentioned york piece has a plurality of above-mentioned projectioies.

4. according to a kind of engine starter of claim 1, it is characterized in that the above-mentioned driving force of above-mentioned motor is delivered on the above-mentioned small gear by a planet reducing gear, above-mentioned output shaft and an overrunning clutch.