CN201066814Y

CN201066814Y - A micro-electromotor gear box

Info

Publication number: CN201066814Y
Application number: CNU2007201111562U
Authority: CN
Inventors: 黄德成
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-06-22
Filing date: 2007-06-22
Publication date: 2008-05-28
Anticipated expiration: 2017-06-22

Abstract

The utility model relates to a miniature motor gear box which comprises a driving part composed by a permanent magnetic rotor, a pole plate and a loop, a directional part composed by a double-arm shifting fork and a ratchet wheel and a deceleration part composed by a gear group. The three parts are positioned and fixed at a lower crust by an upper crust, and the ratchet wheel of the directional part is arranged at a third grade deceleration gear of the deceleration part. The utility model not only can reduce the size of the gear box to be smaller, but the noise is also lower, and the whole machine function is more stable.

Description

A kind of micromachine gear box

Technical field

The utility model relates to a kind of micromachine transmission mechanism technical field, and it belongs to a kind of drive unit in each electric appliances.

Background technology

At present, the micromachine gear box is less because of its volume, simple in structure, advantage such as reliable and being used in widely in each electric appliances, but its general employing multistage center transmission, its volume just can't reach littler like this, and can't be used for the more electrical equipment of the gear box of small size, the patent No. is 97230383.9 structures with the transmission of center, the two poles of the earth that the Chinese utility model patent that is called " micromotor " proposes for this reason, more compact structure like this, and volume is littler, but the ratchet of its bearing portion is fixed on the first order reduction gearing, it not only can't reach the effect that reduces noise like this, but also can increase noise, because speed is high more, the noise that produces is just big more, and under the situation in same power output source, its speed is high more, and power output is also more little.Cause startup stuck on the first order reduction gearing easily so ratchet is fixed on, and be unfavorable for the stable effect of complete machine.Therefore said structure awaits further to improve.

Summary of the invention

The technical problem of the required solution of the utility model is to provide a kind of volume to be dropped to forr a short time at above-mentioned prior art present situation, its noise can be reduced and the more stable electrical micro-machine gear box of complete machine function again.

The technical scheme that the technical problem of the required solution of the utility model is taked is: this micromachine gear box, comprise the drive part that includes p-m rotor, pole piece and coil, the bearing portion that includes both arms shift fork and ratchet, and the deceleration part that includes gear train, this three part on lower house, is characterized in that the ratchet of described bearing portion is arranged on the third level reduction gearing of deceleration part by the upper shell positioning and fixing.

Also be formed with two in order to hold the projection of third level reduction gearing at described lower house,, avoid p-m rotor is impacted so that this gear is firmly stable.

Compared with prior art, advantage of the present utility model is: the utility model is arranged on ratchet on the 3rd group of level gear, and it is littler that the volume of gear box is dropped to, and can make noise lower, and the function of complete machine is more stable; By the setting of two projections, third level gear is stablized in addition, be eliminated influence p-m rotor.

Description of drawings

Fig. 1 is the perspective exploded view of the utility model embodiment.

Fig. 2 is the structural representation of the utility model embodiment.

Fig. 3 is the both arms shift fork and the schematic diagram that cooperates of ratchet.

Fig. 4 is for removing the planar structure schematic diagram behind upper shell, the deceleration part for the utility model.

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

In conjunction with Fig. 1-shown in Figure 4, gear box of the present utility model mainly includes driving, orientation and deceleration three parts, and these three parts are arranged on the lower house 3 of gear box, and upper shell 1 positioning and fixing by combining with lower house 3.Wherein:

Described drive part 4 mainly is made up of institutes such as p-m rotor 41, left and

right pole piece

43,42 and coils 44, wherein left and

right pole piece

43,42 is asymmetric shape, p-m rotor 41 is arranged in the asymmetric inner chamber of being made up of left and right pole piece, two

conductive poles

46,47 are fixed on the coil rack 45, and one be connected with coil, and other end root connects external power.

Described bearing portion 5 mainly is made up of both arms shift fork 51 and ratchet 52, wherein ratchet 52 is arranged on the third level gear 21 of gear train, be structure as a whole with this third level gear 21, being preset with on described lower house 3 can be for the small convex pillar 31 of both arms shift fork location, one end of described both arms shift fork 51 is enclosed within this projection 31 outer, location, and two forks of shift fork collude the outer rim that is positioned at ratchet 52.The ratchet 52 of bearing portion is arranged on the third level gear 21, not only makes the more compact structure of whole gear box, volume littler, and make the noise of gear box lower, performance is more stable.In addition for third level gear 21 is firmly stable, also be formed with two small convex pillars 32 in the inwall both sides of described lower house 3, this small convex pillar 32 is between third level gear 21 and p-m rotor 41, mainly be to be used for third level gear 21 is held, avoid it to move down the back p-m rotor 41 is impacted.

What described deceleration part 2 adopted is the multi-stage speed-reducing gear train of two mandrels of

tool

22,23, and it is provided with according to given speed ratio.

Operation principle is as follows: power supply is connected by binding post and coil, and left and right pole piece produces alternating magnetic field, promotes rotor rotation, because the effect of bearing portion shift fork, ratchet, with given direction rotation, again by train of reduction gears, by certain speed ratio outputting power.

Claims

1. micromachine gear box, comprise the drive part that includes p-m rotor, pole piece and coil, the bearing portion that includes both arms shift fork and ratchet, and the deceleration part that includes gear train, this three part, be is characterized in that on lower house by the upper shell positioning and fixing: the ratchet of described bearing portion is arranged on the third level reduction gearing of deceleration part.

2. micromachine gear box as claimed in claim 1 is characterized in that: be provided with in order to hold the protruding of third level reduction gearing to live on described lower house.