CN201329567Y

CN201329567Y - Novel electric wrench

Info

Publication number: CN201329567Y
Application number: CNU2008201832452U
Authority: CN
Inventors: 毛雄伟
Original assignee: 何美满
Priority date: 2008-12-23
Filing date: 2008-12-23
Publication date: 2009-10-21
Anticipated expiration: 2018-12-23

Abstract

The utility model discloses a novel electric wrench. An electric motor bracket fixed at the front end of an electric motor comprises an aluminium piece and a powder metallurgy oil-retaining bearing, an inner hole of a flywheel is engaged with the oil-retaining bearing, an output shaft is arranged in the flywheel, and the tail portion of the output shaft is engaged with an inner hole of the oil-retaining bearing. A gear clutch includes a driven gear, a steel ball and a compression spring, wherein the driven gear is arranged at a gear end of the flywheel and is fixed through a clamp spring, the steel ball and the compression spring are mounted inside an installation hole on an end surface of the flywheel, an end surface on which the driven gear is engaged with the flywheel is provided with a coning hole clamping the steel ball, and a drive gear arranged on a rotary shaft of the electric motor is meshed with the driven gear. Because the flywheel is equipped with the gear clutch, the gear clutch moves relatively to the flywheel when an impact force surpasses a preset torque, thereby ensuring safety of operators and relative fittings inside the electric wrench and achieving good safety performance.

Description

A kind of electric spanner

Technical field:

The utility model relates to the electric tool technical field, especially relates to the electric wrench technical field.

Background technology:

Electric wrench is after utilizing DC12V motor-driven flywheel to reach certain rotating speed, makes the centrifugal generation centrifugal motion that is installed on the flywheel, and centrifugal is impacted output shaft and make electric wrench produce the powerful impact moment of moment.

There is certain problem in existing electric wrench in security, in addition, have inconvenience in production technology with installing.

The utility model content:

The purpose of this utility model is to provide a kind of electric spanner, and it has the characteristics safer, that manufacture craft is simple and reliable and easy for installation of using.

For achieving the above object, the utility model includes: motor, travelling gear, electric machine support, engagement sleeve, flywheel and output shaft, wherein, electric machine support is fixed in the motor front end, it includes aluminum component and powder metallurgy oil-impregnated bearing, the endoporus of flywheel cooperates with the oiliness bearing cylindrical, and output shaft is contained in the flywheel, and its afterbody cooperates with the endoporus of oiliness bearing; Engagement sleeve comprises driven gear, steel ball and compression spring, wherein, driven gear is installed on the gear end of flywheel, and fix with jump ring, steel ball and compression spring are installed in the installing hole on the flywheel end face, offer the tapered hole that blocks steel ball on driven gear and the end face that flywheel cooperates; Be installed in travelling gear and driven gear engagement in the rotating shaft of motor.

Described oiliness bearing and aluminum component are die cast as an integral body.

The beneficial effects of the utility model are: owing on the flywheel engagement sleeve has been installed, when impulsive force surpasses the moment of torsion of setting, produce relative motion between the driven gear of engagement sleeve and the flywheel, can protect interior related accessory of electric wrench and operating personnel's safety like this, security is very good; Secondly, the aluminum component of oiliness bearing and electric machine support is die cast as an integral body, has both guaranteed the perpendicularity of powder metallurgy oil-impregnated bearing and support, makes the manufacture craft advantages of simple of electric machine support, installation very convenient again; In addition, the output shaft bearing shelves in the powder metallurgy oil-impregnated bearing endoporus on the electric machine support and the flywheel cooperate, and the powder metallurgy oil-impregnated bearing cylindrical cooperates with the endoporus of flywheel gear end, has played the support location and the lubrication of inside and outside drive disk assembly well.

Description of drawings:

Below in conjunction with accompanying drawing the utility model is described further:

Fig. 1 is flywheel structure schematic diagram of the present utility model (removing steel ball and compression spring);

Fig. 2 is a motor supporting structure schematic diagram of the present utility model;

Fig. 3 is an overall structure schematic diagram of the present utility model.

The specific embodiment:

The following stated only is preferred embodiment of the present utility model, does not therefore limit protection domain of the present utility model.

See that Fig. 1 is to shown in Figure 3: electric spanner of the present utility model includes: motor 10, travelling gear 20, electric machine support 30, engagement sleeve 40, flywheel 50 and output shaft 60, wherein, electric machine support 30 is fixed in motor 10 front ends, it includes aluminum component 31 and the powder metallurgy oil-impregnated bearing 32 that is die cast as one, the endoporus 51 of flywheel 50 cooperates with oiliness bearing 32 cylindricals, output shaft 60 is contained in the flywheel 20, and the bearing crotch 61 of its afterbody cooperates with the endoporus 321 of oiliness bearing 32; Engagement sleeve 40 comprises driven gear 41, steel ball 42 and compression spring 43, wherein, driven gear 41 is installed on the gear end 52 of flywheel 50, and it is fixing with jump ring 53, steel ball 42 and compression spring 43 are installed in four installing holes 501 on flywheel 50 end faces, offer eight tapered holes 411 that block steel ball 42 on driven gear 41 and the end face that flywheel 50 cooperates; Be installed in travelling gear 20 and driven gear 41 engagements in the rotating shaft 11 of motor 10.

After motor 10 driving flywheels 50 reach certain rotating speed; produce strong wallop; when impulsive force surpasses the moment of torsion of setting; engagement sleeve 40 actions; steel ball 42 pressurizeds will compress spring 43 and be pressed in the installing hole 501; driven gear 41 idle running, thereby the associated components of protection electric wrench and operating personnel's safety.

Claims

1. electric spanner, include: motor (10), travelling gear (20), electric machine support (30), engagement sleeve (40), flywheel (50) and output shaft (60), it is characterized in that: electric machine support (30) is fixed in motor (10) front end, it includes aluminum component (31) and powder metallurgy oil-impregnated bearing (32), the endoporus (51) of flywheel (50) cooperates with oiliness bearing (32) cylindrical, output shaft (60) is contained in the flywheel (20), and the bearing crotch (61) of its afterbody cooperates with the endoporus (321) of oiliness bearing (32); Engagement sleeve (40) comprises driven gear (41), steel ball (42) and compression spring (43), wherein, driven gear (41) is installed on the gear end (52) of flywheel (50), and it is fixing with jump ring (53), steel ball (42) and compression spring (43) are installed in the installing hole (501) on flywheel (50) end face, offer the tapered hole (411) that blocks steel ball (42) on driven gear (41) and the end face that flywheel (50) cooperates; Be installed in travelling gear (20) and driven gear (41) engagement in the rotating shaft (11) of motor (10).

2. the electric spanner of stating according to claim 1 is characterized in that: described A: engagement sleeve (40), and when impulsive force surpassed the moment of torsion of setting, engagement sleeve (40) produced relative motion with flywheel (50); B: the oiliness bearing of electric machine support (32) is die cast as an integral body with aluminum component (31), and the support location and the lubrication of the inside and outside drive disk assembly of oiliness bearing (32).