CN2557712Y

CN2557712Y - Starter capable of slow rotation

Info

Publication number: CN2557712Y
Application number: CN 02262829
Authority: CN
Inventors: 吴建刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-06-28
Filing date: 2002-06-28
Publication date: 2003-06-25
Anticipated expiration: 2012-06-28

Abstract

Disclosed is a slow starter motor which is characterized in that the sucking coil of an electromagnetic switch is connected in series with the armature of a permanent magnetic DC motor, so that the working current of the sucking coil passes through the armature; the section and the lap number of the sucking coil can be arranged in accordance with the characteristics of the electromagnetic switch and also provides electricity for the armature; the electrified armature rotates slowly in a magnetic field which is originated at the magnetic pole of the permanent magnet, which leads to that no gear goring occurs when the drive gear meshes with the serrated ring of the flywheel, thus meshing springs can be dispended with. Therefore the electromagnetic switch is simplified in structure, reduced in volume, weight and cost.

Description

But the starter motor of slow-speed

But the utility model relates to a kind of starter motor that supplies the slow-speed of used for starting of IC engine.

The starter motor of existing various ways does not have the slow-speed function mostly, belongs to positively engaging formula starter motor.In this starter motor working procedure, its actuation gear is before the flywheel ring gear with internal-combustion engine meshes, if " apical tooth " takes place, promptly the crown of actuation gear just withstands on the crown of flywheel ring gear, will cause actuation gear not mesh smoothly with flywheel ring gear.Have to rely on engage spring on the compression overrunning clutch (engage spring of some starter motor be installed on the shift fork or magnetic switch movable core in) this moment, make the movable core of magnetic switch continue to move, connect until main contact, after making the starter motor energising turn over an angle, actuation gear meshes with flywheel ring gear under the effect of engage spring.Because behind the compressive engagement spring, actuation gear is pressed on the flywheel teeth tightly, flywheel teeth is damaged easily in the engagement process.

" automobile electrical appliances " disclose a kind of " the novel starter motor with slow-speed " on 1992 the 3rd phases, it is to divide 4 field coils for two steps connected power supply, the first step is only connected the power supply of 1 field coil, make starter motor with 1/4 full power rotating speed slow-speed, avoided " apical tooth ", by the time after actuation gear and the flywheel ring gear engagement, just connect the power supply of all the other 3 field coils, make starter motor send full power.Since to divide for two steps connected power supply, the magnetic switch complex structure, manufacturing process, tolerances etc. require very high, cause the corresponding raising of cost.

It is simple in structure that task of the present utility model provides a kind of magnetic switch, but the starter motor of slow-speed.Thereby can avoid the deficiency of above-mentioned prior art.

But the starter motor of the utility model slow-speed comprises overrunning clutch, planetary gear speed reducing mechanism, permanent magnet DC motor and magnetic switch 4 major parts.Wherein have actuation gear and splined sleeve on the overrunning clutch, planetary gear speed reducing mechanism is made up of planetary gear set and live axle, and permanent magnet DC motor is made up of permanent magnet poles, armature, commutator, carbon brush and shell.Magnetic switch is made up of movable core, iron core return spring, sucking coil, hold-in winding, push rod, buting iron, contact spring, movable contact, stationary contact, contact return spring, shell and shift fork.Sucking coil is connected with armature, and the electric current that makes sucking coil as long as suitably select the cross section and the number of turn of sucking coil, makes its pull characteristics that both satisfied magnetic switch by armature, can provide certain electric current to armature again.Armature by certain electric current will slow-speed under the action of a magnetic field that permanent magnet poles forms so, like this actuation gear with the flywheel ring gear engagement process in because actuation gear rotates, just " apical tooth " can not take place, also just no longer need engage spring.

But be described further below in conjunction with the starter motor of accompanying drawing to the utility model slow-speed.

Fig. 1 is a sectional drawing of the present utility model.

Fig. 2 is a working principle schematic representation of the present utility model.

But the starter motor of the utility model slow-speed, the overrunning clutch 3 that comprises band actuation gear 2 and splined sleeve 4, the planetary gear speed reducing mechanism of forming by planetary gear set 5 and live axle 1, the permanent magnet DC motor of forming by permanent magnet poles 6, armature 7, carbon brush 8, commutator 9, shell 10, the magnetic switch of forming by movable core 12, iron core return spring 13, sucking coil 15, hold-in winding 16, push rod 17, buting iron 18, contact spring 19, movable contact 20, stationary contact 21, contact return spring 22, shell 14, shift fork 11.Overrunning clutch 3 is sleeved on the live axle 1, and the internal spline of splined sleeve 4 cooperates with the spline on the live axle 1 is movable, and the negative pole of sucking coil 15 is connected with carbon brush 8, sucking coil 15 is connected, the direct bonding of the negative pole of hold-in winding 16 with armature 7.

When closed switch starter 23, the sucking coil 15 of magnetic switch, hold-in winding 16 gets electric, and wherein the electric current of sucking coil 15 will flow through armature 7 by carbon brush 8, get back to the negative pole of storage battery 24 then through the bonding carbon brush.Like this when sucking coil 15, the electromagnetic attraction that hold-in winding 16 produces makes movable core 12 move to buting iron 18, when thereby pulling shift fork 11 is pushed actuation gear 2 flywheel ring gear 25 of internal-combustion engine to, obtained certain voltage on the armature 7, slow-speed under the action of a magnetic field that permanent magnet poles 6 forms, by the deceleration of planetary gear set 5, actuation gear 2 slowly rotates.After actuation gear 2 and flywheel ring gear 25 engagements, movable core 12 bump push rods 17 are connected movable contact 20 and stationary contact 21, armature 7 acquisition voltage ratings, and starter motor sends full power and drives the internal-combustion engine rotation.

Because actuation gear 2 is rotating in flywheel ring gear 25 moving process, so actuation gear 2 " apical tooth " can not take place with flywheel ring gear 25, starter motor also just no longer needs engage spring.In order to guarantee both to make the reliable adhesive of magnetic switch, can allow armature 7 obtain enough voltage again and make its slow-speed, sucking coil 15 is different with the number of turn of hold-in winding 16, and the cross section of sucking coil 15 is bigger, and the number of turn is less, and the cross section of hold-in winding 16 is less, the number of turn is more.

Preferred embodiment of the utility model is: when sucking coil 15 adds 75% voltage rating simultaneously with hold-in winding 16, reliably adhesive of magnetic switch, when hold-in winding 16 adds 40% voltage rating, magnetic switch keeps the attracted position, and the number of turn of sucking coil 15 is the 50%-70% of hold-in winding 16.

But but the starter of the utility model slow-speed compare with the starter of existing other form slow-speed, electromagnetic switch is simple in structure, The aspect such as manufacturing process, tolerance less demanding. Compare with common permanent magnetism deceleration positively engaging formula starter, possess again slow-speed Function makes the engagement of driven wheel and flywheel ring gear soft, can not damage flywheel teeth. And without engage spring, reduced part Quantity has been simplified manufacturing process, and the electromagnetic attraction of electromagnetic switch can suitably be reduced, thus the volume that makes electromagnetic switch with Weight all can descend, and has reduced cost.

Claims

A kind of overrunning clutch 3 that comprises band actuation gear 2 and splined sleeve 4, the planetary gear speed reducing mechanism of forming by planetary gear set 5 and live axle 1, by permanent magnet poles 6, armature 7, carbon brush 8, commutator 9, the permanent magnet DC motor that shell 10 is formed, by movable core 12, iron core return spring 13, sucking coil 15, hold-in winding 16, push rod 17, buting iron 18, contact spring 19, movable contact 20, stationary contact 21, contact return spring 22, shell 14, but the starter motor of the slow-speed of the magnetic switch that shift fork 11 is formed, its overrunning clutch 3 is sleeved on the live axle 1, the internal spline of splined sleeve 4 cooperates with the spline on the live axle 1 is movable, the negative pole of sucking coil 15 is connected with carbon brush 8, sucking coil 15 is connected with armature, the direct bonding of the negative pole of hold-in winding 16 is characterized in that:

1, there is not engage spring;
2, the number of turn of sucking coil is the 50%-70% of the hold-in winding number of turn;
3, magnetic pole is a permanent magnet.