CN200940536Y

CN200940536Y - Starter having double rolling bearing structure

Info

Publication number: CN200940536Y
Application number: CN 200620071543
Authority: CN
Inventors: 朱成明; 恽志宏
Original assignee: PEI YAJU
Current assignee: PEI YAJU
Priority date: 2006-05-22
Filing date: 2006-05-22
Publication date: 2007-08-29
Anticipated expiration: 2016-05-22

Abstract

A starter with double rolling bearing structure which belongs to starting technology field comprises a rotor shaft 1, a front cover 2, a middle cover 3, a rear cover 4, a front bearing 5, a middle bearing 6, a rear bearing 7, a rotor core 8, a stator 9, an electromagnetic switch 10, a monodirectional device 11 and a fork 12. The middle bearing 6 and the rear bearing 7 of the starter are rolling bearings and the middle cover 3 is an aluminum cover. The starter has good intensity on its whole structure and has high precision as well as reliable and smooth operation. Compared with the starter of prior structure, the rotating speed is increased by 10 percent to 15 percent, the power is increased by 8 percent to 12 percent and the service life isone to two times higher than that of the prior starter.

Description

Starter motor with double rolling bearing structure

Technical field

The utility model relates to the starter motor technical field, especially a kind of starter motor with double rolling bearing structure.

Background technique

The starting of petrol engine or diesel engine is started by starter motor, and whole starting process is such:

Switch starting, magnetic switch energising (sucking coil and hold-in winding are worked simultaneously), under the electromagnetic attraction effect, moving iron core is inhaled.At this moment, make starter pinion reach by means of shift fork and mesh with flywheel ring gear.Meanwhile, switch main contact closure is connected starter power, and engine crankshaft is given in armature rotation and transmission torque.In the time of the main contact closure, after this sucking coil is just made iron core continue to move up to complete adhesive and keeps attracting state by short circuit by hold-in winding.Starter pinion will continue reach till running into back-up ring for the effect of helical spline.Drag as driving wheel in the whole process of flywheel ring gear at small gear, small gear and flywheel ring gear are in engagement fully, and clutch keeps jointing state always.

After the engine start, before disconnecting switch starter, magnetic switch keeps attracting state, and small gear and flywheel ring gear keep engagement.Yet at this moment the engine flywheel ring gear becomes driving wheel, and the small gear rotating speed is sharply increased, and overrunning clutch skids, and the starter motor electric current descends, and the armature rotating speed is near unloaded situation.

After disconnecting switch starter, the suction of two coils of magnetic switch is cancelled each other.Under the return spring effect, electromagnet discharges, and main contact is disconnected, and starter motor stops the rotation.Simultaneously, small gear withdraws from, and gets back to the home position, and starting process finishes.

Starter motor structurally includes some component like this: magnetic switch, shift fork, rotor shaft, rotor iron core, stator, protecgulum, middle cover, bonnet, fore bearing, middle (center) bearing, rear bearing and one-way element.

Fore bearing, middle (center) bearing, the rear bearing of existing this starter motor are sliding bearing, promptly all are a kind of brass structures, and on supporting form, fore bearing and rear bearing are as the main support of rotor shaft, and middle (center) bearing is as the supplemental support of rotor shaft; Middle cover is to have through the sheet metal shaped structures.From the behaviour in service of this starter motor and since main motion parts adopt be that a kind of intensity of sliding friction brass is low, low precision, poor reliability cause the galloping of starter motor, the life-span is short, efficient is low; From the supporting form of axle,, fore bearing is easier to cause the distortion of axle as a main support because the shaft extension forward end has the structure that attenuates; Middle cover adopts to have through the sheet metal shaped structures, makes middle cover also be easier to distortion.

The structural type of above-mentioned this starter motor is to be adopted by people up till now always, though its poor reliability, the life-span is short, efficient is low, its price is lower slightly, is similar to a kind of low priced and easily worn articles, in a word, has increased more user cost to the user.

Summary of the invention

For short, the inefficient deficiency of galloping, life-span that overcomes existing starter motor, the purpose that the utility model relates to provides a kind of intensity height, precision is good, the starter motor with double rolling bearing structure reliably steady, that the life-span is long, efficient is high turns round.

The technological scheme that its technical problem that solves the utility model adopts is: a kind of starter motor with double rolling bearing structure, comprise rotor shaft, protecgulum, middle cover, bonnet, fore bearing, middle (center) bearing, rear bearing, rotor iron core, stator, magnetic switch, one-way element, shift fork.Described middle (center) bearing, rear bearing are rolling bearing, and more particularly middle (center) bearing, rear bearing are deep groove ball bearing.Described middle cover is an aluminium lid.

The beneficial effects of the utility model are: the starter motor with double rolling bearing structure of the present utility model, it is to roll that middle (center) bearing, rear bearing are become slip, the middle (center) bearing place becomes main support by original supplemental support, make rotor shaft stressed rationally, distortion is little, middle cover adopts cast aluminium to prevent the distortion of middle cover.Therefore overall construction intensity is good, precision is high, running is steadily reliable, and the starter motor rotating speed of the existing structure of contrast improves 10～15%, and power improves 8～12%, increases by 1～2 times working life.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the structural representation that the utility model relates to.

Among the figure, 1, rotor shaft 2, protecgulum 3, middle cover 4, bonnet 5, fore bearing 6, middle (center) bearing 7, rear bearing 8, rotor iron core 9, stator 10, magnetic switch 11, one-way element 12, shift fork.

Embodiment

A kind of starter motor with double rolling bearing structure as accompanying drawing 1 has comprised rotor shaft 1, protecgulum 2, middle cover 3, bonnet 4, fore bearing 5, middle (center) bearing 6, rear bearing 7, rotor iron core 8, stator 9, magnetic switch 10, one-way element 11, shift fork 12.Shift fork 12 1 ends connect with the moving iron core of magnetic switch 10 is movable, the other end and 11 movable connections of one-way element, one-way element 11 is enclosed within on the rotor shaft 1, the structure that has on rotor shaft 1 slidably and rotate with rotor shaft 1, the inner ring of middle (center) bearing 6 and rear bearing 7 and rotor shaft 1 drive fit, the outer ring respectively with middle cover 3 and bonnet 4 drive fits, middle cover 3, bonnet 4 is fixedlyed connected with stator 9 with protecgulum 2, fore bearing 5 is on protecgulum 2, magnetic switch 10 is in stator 9 outsides, fixedly connected with stator 9, middle (center) bearing 6 is that a kind of model is 61804 deep groove ball bearing, rear bearing 7 is that a kind of model is 6201 deep groove ball bearing, fore bearing 5 is because of still adopting sliding bearing as a supplemental support, middle cover 3 prior aries are to adopt the sheet metal moulding of thick 2mm to make, existing this middle cover very easily is out of shape, and is to make with the cast aluminium of average thickness 5mm as the middle cover among the figure 3.

Adopting on the basis of rolling bearing at middle (center) bearing 6, rear bearing 7, though fore bearing 5 is to adopt sliding bearing to adopt the rolling bearing DeGrain as a supplemental support, but also all should be protection domain of the present utility model.

Claims

1, a kind of starter motor with double rolling bearing structure, it is characterized in that: comprise rotor shaft (1), protecgulum (2), middle cover (3), bonnet (4), fore bearing (5), middle (center) bearing (6), rear bearing (7), rotor iron core (8), stator (9), magnetic switch (10), one-way element (11), shift fork (12), shift fork (12) one ends connect with the moving iron core of magnetic switch (10) is movable, the other end connects with one-way element (11) is movable, one-way element (11) is enclosed within on the rotor shaft (1), the structure that has on rotor shaft (1) slidably and rotate with rotor shaft (1), the inner ring of middle (center) bearing (6) and rear bearing (7) and rotor shaft (1) drive fit, the outer ring respectively with middle cover (3) and bonnet (4) drive fit, middle cover (3), bonnet (4) is fixedlyed connected with stator (9) with protecgulum (2), fore bearing (5) is on protecgulum (2), magnetic switch (10) is in stator (9) outside, fixedly connected with stator (9), described middle (center) bearing (6), rear bearing (7) is a rolling bearing, and described middle cover (3) is an aluminium lid.

2, the starter motor with double rolling bearing structure according to claim 1 is characterized in that: described middle (center) bearing (6), rear bearing (7) are deep groove ball bearing.