CN205479288U - Electric tool - Google Patents

Abstract

The utility model discloses an electric tool, angle mill especially, it includes: including a motor, an end cap, a controller, and a cover plate, the motor has the motor shaft, and gear box, the motor is located outside the gear box, just motor shaft goes into in the gear box, the motor shaft via an antifriction bearing for the gear box is supported, antifriction bearing's bearing inner race for the gear box is fixed, antifriction bearing's bearing inner race for the motor shaft is fixed, and a gear is in install in the gear box on the motor shaft, an oil ring cover is established on the motor shaft and receive the gear extrudees and fixes the gear with between the antifriction bearing, at the perpendicular to observe in the plane of the axis of motor shaft, it covers to seal the oil ring bearing inner race with space between the bearing inner race.

Description

Electric tool

Technical field

This utility model relates to electric tool, especially angle grinding machine, the gear of described electric tool Case, equipped with the sealing structure improved, prevents the grease of inside from leaking.

Background technology

The power that moment of torsion is transferred to by gear drive from motor is generally used in electric tool Output shaft.As a example by the grinding machine of angle, it generally includes motor, defeated for installing the power of blade Shaft and the helical gear pair being connected between motor and power output shaft.This helical gear is to peace It is contained in a gear-box.Need and the specific reason in application scenario for lubrication, at gear-box In would generally be full of grease.

In gear-box, a helical gear of helical gear centering is arranged on the axle of motor, simultaneously This axle is close to this helical gear and is also equipped with a pair rolling bearing.When helical gear runs up, The effect of being squeezed, grease can gather in the space between this helical gear and rolling bearing. In order to prevent grease from leaking, it is generally equipped with such as between the inner ring and outer ring of this rolling bearing The bearing (ball) cover of quality of rubber materials.Although this bearing (ball) cover can play certain sealing function, But when motor shaft high speed rotating, at rolling bearing, especially go back between inner ring and bearing (ball) cover It is to produce gap, causes grease to leak, reduce gear lubrication degree.

This type of grease is leaked problem, if using common metal disc to solve Words, the disc of this metal material must be interposed between helical gear and the outer ring of rolling bearing. When motor shaft high speed rotating, the friction between disc and outer ring can cause temperature anomaly to raise, And then affect the quality of grease, cause lubricant effect to be deteriorated.

If using common felt seal part, the size of this felt seal part must set Be set to its can elastic conjunction in gear-box, which results in by helical gear, bearing and Forward must be used when felt seal part is assembled on motor shaft and reversely assemble the side combined Formula, result in assembling difficulty and increases.

Utility model content

In order to solve the above-mentioned problems in the prior art, this utility model is directed to one In electric tool, the sealing structure of especially improvement employed in gear-box, it can be reliable Ground reduce grease leak, will not cause when the motor of electric tool runs up simultaneously overheated, In addition assemble and be convenient to.

According to an aspect of the invention, it is provided a kind of electric tool, comprising:

Motor, described motor has motor shaft；And

Gear-box, described motor is positioned at outside described gear-box, and described motor shaft stretches into described tooth In roller box, described motor shaft is supported by relative to described gear-box via a rolling bearing, described The bearing outer ring of rolling bearing is fixed relative to described gear-box, in the bearing of described rolling bearing Circle is fixed relative to described motor shaft, and a gear is arranged on described motor shaft in described gear-box On, wherein, a nonmetallic oil seal ring is set on described motor shaft and by described gear extrusion And be fixed between described gear and described rolling bearing, at the axis being perpendicular to described motor shaft Plane in observe, described oil seal ring covers between described bearing outer ring and described bearing inner race Space.

Alternatively, described oil seal ring end face and the described bearing inner race of described gear end face it Between be extruded fixing.

Alternatively, the external diameter of described oil seal ring is more than the internal diameter of described bearing outer ring but less than described The external diameter of bearing outer ring.

Alternatively, the radially outward edge of described oil seal ring and the end contact of described bearing outer ring.

Alternatively, the radially outward edge of described oil seal ring is contactless with the end face of described bearing outer ring.

Alternatively, described oil seal ring is smooth annulus.

Alternatively, described oil seal ring is made up of plastics or synthetic fibers.

Alternatively, described oil seal ring is by making the material of oil suction.

Alternatively, described oil seal ring is made up of the rolling cardboard being used for manufacturing motor.

According to another aspect of the present utility model, it is provided that a kind of electric tool, comprising:

Motor, described motor has motor shaft；And

Gear-box, described motor is positioned at outside described gear-box, and described motor shaft stretches into described tooth In roller box, described motor shaft is supported by relative to described gear-box via a rolling bearing, described The bearing outer ring of rolling bearing is fixed relative to described gear-box, in the bearing of described rolling bearing Circle is fixed relative to described motor shaft, and a gear is arranged on described motor shaft in described gear-box On, wherein, the oil seal ring of a metal is set on described motor shaft and by described gear extrusion It is fixed between described gear and described rolling bearing, is being perpendicular to the axis of described motor shaft Observing in plane, described oil seal ring covers the sky between described bearing outer ring and described bearing inner race Between, and the radially outward edge of described oil seal ring is contactless with the end face of described bearing outer ring.

Alternatively, described oil seal ring is circular cone flare form, and described oil seal ring is with described circular cone Enlarging deviates from the mode of described rolling bearing and is arranged between described gear and described rolling bearing.

According to another aspect of the present utility model, additionally provide a kind of electric tool, comprising:

Motor, described motor has motor shaft；And

Gear-box, described motor is positioned at outside described gear-box, and described motor shaft stretches into described tooth In roller box, described motor shaft is supported by relative to described gear-box via a rolling bearing, described The bearing outer ring of rolling bearing is fixed relative to described gear-box, in the bearing of described rolling bearing Circle is fixed relative to described motor shaft, and a gear is arranged on described motor shaft in described gear-box On, it is characterised in that the oil seal ring of a metal is set on described motor shaft and by described gear Extrude and be fixed between described gear and described rolling bearing, be perpendicular to described motor shaft The plane of axis is observed, described oil seal ring cover described bearing outer ring and described bearing inner race it Between space, and the surface at least towards described rolling bearing of described oil seal ring has wear-resisting And the coating that coefficient of friction is low.

Alternatively, described electric tool is angle grinding machine, and described gear is helical gear.

Use above-mentioned technological means of the present utility model, the premise assembling difficulty can not increased Under, reduce the probability that grease leaks from gear-box further, also avoid tradition simultaneously and get rid of Oil ring when motor shaft runs up frictional heat and cause the probability that PERFORMANCE OF GREASES is deteriorated, Additionally reduce manufacturing cost.

Accompanying drawing explanation

From detailed description described later and combine figure below that this practicality can be more fully understood is new Aforementioned and the other side of type.It is pointed out that the ratio of each accompanying drawing is for understanding explanation Purpose is the most different, but this can't affect understanding of the present utility model.In the accompanying drawings:

Fig. 1 diagrammatically illustrates the partial sectional view of electric tool, the especially gear-box of angle grinding machine, Wherein equipped with the oil seal ring according to an embodiment of the present utility model；

Fig. 2 a diagrammatically illustrates the oil seal ring that can use in FIG；

Fig. 2 b diagrammatically illustrates the oil seal ring according to another embodiment of the present utility model Sectional view；

Fig. 2 c diagrammatically illustrates cutting of the oil seal ring according to another embodiment of the present utility model Face figure；And

Fig. 2 d diagrammatically illustrates the oil seal ring according to another embodiment of the present utility model Sectional view.

Detailed description of the invention

In each accompanying drawing of the application, structure is identical or intimate feature is by identical accompanying drawing Labelling represents.

Fig. 1 diagrammatically illustrates an electric tool.As a example by the grinding machine of angle, this electric tool is big Include on body that motor (not shown), process tool for mounted thereon such as blade (do not show Go out) output shaft 80 and between described motor and described output shaft arrange gear-box 10.

Motor includes an axle 20.A pair helical gear 30 and 40 is accommodated in gear-box 10.Tiltedly Gear 30 is arranged on motor shaft 20, and the helical gear 40 being engaged with is arranged on output shaft On 80, such power can rotate approximately ninety degrees and be transferred to output shaft 80 from motor shaft 20, Driving process tool rotates.

Specifically, as it is shown in figure 1, motor shaft 20 via a rolling bearing relative to gear-box 10 are supported by.This rolling bearing includes bearing outer ring 91, bearing inner race 92 and is arranged in institute State the multiple bearing rollers 93 between bearing outer ring 91 and described bearing inner race 92, such as, roll Pearl.Preferably, these balls can via ball rack be maintained at bearing inner race and bearing outer ring it Between.

One end face of bearing inner race 92 axially abuts against a shoulder on motor shaft 20 21.Helical gear 30 is enclosed within motor shaft 20, thus helical gear 30 is axially towards in bearing Another end face contrary of circle 92.

Bearing outer ring 91 two end faces contrary with bearing inner race 92 of rolling bearing are provided with Groove, thus two bearing (ball) covers 94 and 95 can be accommodated in a groove respectively.Such as, institute State bearing (ball) cover 94 and 95 to be made up of rubber.

For the purpose lubricated, grease can be full of in gear-box 10.When helical gear is to 30 With 40 under the driving of motor shaft 20 with the mutually inter-engaging rotate time, grease can be along tiltedly Between gear mesh engagement position outwardly against.Although bearing (ball) cover 94 and 95 can play one Fixed sealing function prevents grease from leaking, but when motor shaft 20 runs up, at bearing Around end cap 94 and 95 essential or certain gap can be produced, thus grease along Gear-box 10 can be released outward in gap, is seriously likely to result in lubrication failure.

In order to prevent grease from leaking from gear-box 10 further when motor shaft 20 runs up, According to this utility model, between helical gear 30 and rolling bearing, it is gripped with an oil seal ring 60. This oil seal ring such as can by have the nonmetallic materials of low-friction coefficient, composite fibre materials, Be usually used in nylon or other suitable plastics or even field of motor manufacturing insulating the rolling of purpose Cardboard is made.

The cross section being perpendicular to motor shaft 20 is observed, the view field of this oil seal ring 60 Within radially outside boundary is positioned at the radially outside boundary of bearing outer ring 91.Specifically, this oil seal ring 60 contact bearing outer rings 91 towards the end face within gear-box 10, thus radially block axle Space between bearing outer-ring 91 and bearing inner race 92, especially block bearing (ball) cover 94.Alternatively, The radially outward edge of oil seal ring 60 can be arranged on the end face of bearing outer ring 91 just along axle To the radially outward edge blocking bearing (ball) cover 94.

When assembling, this oil seal ring 60 is interposed between helical gear 30 and rolling bearing, passes through Nut 70 abuts against on the other end of motor shaft 20 helical gear 30 tighten, helical gear 30 End face extruding oil seal ring 60, and be fixed in the end face of bearing inner race 91 and helical gear 30 Between.According to this utility model, the thickness of oil seal ring 60 can be at 0.1 millimeter to several millimeters Between, and radial dimension can be arranged to just can through gear-box 10 for receiving axle The hole of bearing outer-ring 91, thus assemble the helical gear of angle grinding machine to, gear-box, bearing and motor During axle, unidirectional can assemble, conveniently operate.

It will furthermore be apparent that the axial restraint of helical gear 30 is not limited to use nut 70 Tightening and realize, other suitable fixed form any all can use in this utility model.

Fig. 2 a diagrammatically illustrates an embodiment of oil seal ring 60.According to this embodiment, envelope Oil ring 60 is a smooth annulus.So, when oil seal ring 60 in gear-box 10 assembled just After Wei, the radially outward edge of oil seal ring 60 and the end contact of bearing outer ring 91.Because this envelope Oil ring 60 is made up of nonmetallic materials and has low-friction coefficient, thus when motor shaft 20 at a high speed During operating, although contacting between oil seal ring 60 and the end face of bearing outer ring 91, but unlikely lead Cause too high temperature and reduce the performance of grease.

Fig. 2 b diagrammatically illustrates another embodiment of oil seal ring 60.Different from Fig. 2 a, should Oil seal ring 60 is observed in cross section X-X and is with respect to the horizontal plane inclined to set, i.e. from oil sealing The radially outward edge of ring 60 is radially oriented inward flange and tilts (the least with the angle of horizontal plane). It is to say, the shape that this oil seal ring 60 is circular cone enlarging.The oil seal ring of this circular cone enlarging shape 60 have two kinds of mounting means in this utility model.A kind of is that the enlarging of oil seal ring 60 is towards rolling Dynamic bearing is fixed on motor shaft 20, so, due to the shape of enlarging, the footpath of oil seal ring 60 The end face of bearing outer ring 91 more it is adjacent to outward flange.Another kind is the enlarging back of the body of oil seal ring 60 It is fixed on motor shaft 20 from rolling bearing, so, although compared with smooth oil seal ring, A little gap can be there is in the radially outward edge of oil seal ring 60 with the end face of bearing outer ring 91, but Therebetween friction has not had, from without the property to grease due to frictional heating again Any negative effect can be caused；Can cover further, since oil seal ring 60 is seen in the axial direction Live the gap between bearing inner race 91 and bearing outer ring 92, so not having too many grease Leaking, fitted bearing end cap 94 has been significantly reduced what grease leaked from gear-box 10 simultaneously Probability.It is to say, oil seal ring 60 the most as shown in Figure 2 b is installed in which way, All can improve the sealing effectiveness of gear-box 10.

Fig. 2 c and 2d shows other feasible embodiment of oil seal ring 60, in the former, and envelope Oil ring 60 is watched in cross section X-X has an interior shoulder, in the latter, and oil seal ring 60 Cross section X-X watch curved.It will be apparent to those skilled in the art that oil seal ring 60 Shape be not limited to what Figure of description had shown that, any can realize in this specification for The shape of the said function that oil seal ring describes all can use in oil seal ring.

In a preferred embodiment of the present utility model, oil seal ring 60 is by cardboard, especially motor Manufacture field forms for the rolling cardboard of purpose of insulating is die-cut.Use the oil seal ring 60 of papery An advantage be, from grease, have parts of lubricating oil separate out and penetrate into oil seal ring 60 In, the outer surface of oil seal ring 60 is formed one layer of oil film, this oil film can further function as Prevent the sealing function that grease leaks.It will be apparent to those skilled in the art that and any can inhale The material of oil may be incorporated for manufacturing oil seal ring of the present utility model.

Use technique scheme of the present utility model, the premise assembling difficulty can not increased Under, reduce the probability that grease leaks from gear-box further, the most nonmetal oil seal ring Use also reduce frictional heat when motor shaft runs up and cause that PERFORMANCE OF GREASES is deteriorated can Can property.

It will be apparent to those skilled in the art that the technical scheme having been described above of the present utility model not Only may apply to, in the gear-box of angle grinding machine, actually be also applied to other electric tool Equipped with gear-box (be wherein not only helical gear to can also is that spur gear to), needs Prevent in the case of the grease in gear-box from leaking.

Additionally, in alternate embodiments, oil seal ring 60 can also use metal material to make. In this case, in order to avoid radially outward edge and the end of bearing outer ring 91 of oil seal ring 60 Face contact thus produce amount of heat due to friction when motor shaft 20 runs up, can be by The oil seal ring 60 of this metal is such as arranged with the shape of circular cone enlarging as shown in Fig. 2 b to 2d, This circular cone enlarging deviates from when assembling bearing face simultaneously install, so that at oil seal ring 60 Radially outward edge and the end face of bearing outer ring 91 between still suffer from one the least but will not be right The sealing of grease causes the gap of undue impact, thus avoids frictional heat between metal And cause the probability that PERFORMANCE OF GREASES is deteriorated.

In another alternative embodiment, oil seal ring can also be smooth becket, but at table Face, especially towards having wear-resisting and that coefficient of friction is low coating on the surface of rolling bearing.Need It is to be noted in the context of this application, coefficient of friction refers to two parts contacted Between the coefficient of kinetic friction；The low relative motion referred between the two part of coefficient of friction is not Substantial amounts of heat can be caused to produce so that grease goes bad.

Although describing particular implementation of the present utility model here in detail, but they are only Be given for purposes of explanation, and it is not considered that scope of the present utility model is constituted by they Limit.On the premise of without departing from this utility model spirit and scope, various replacements, change and Transformation can be contemplated out.

Claims (15)

1. an electric tool, comprising:

Motor, described motor has motor shaft (20)；And

Gear-box (10), described motor is positioned at described gear-box (10) outward, and described motor shaft (20) stretching in described gear-box (10), described motor shaft (20) is via a rolling bearing It is supported by relative to described gear-box (10), bearing outer ring (91) phase of described rolling bearing For described gear-box (10) fix, the bearing inner race (92) of described rolling bearing relative to Described motor shaft (20) is fixed, and a gear (30) is arranged in described gear-box (10) On described motor shaft (20), it is characterised in that a nonmetallic oil seal ring (60) is set in Described motor shaft (20) is upper and is fixed on described gear (30) by described gear (30) extruding And between described rolling bearing, see in being perpendicular to the plane of axis of described motor shaft (20) Examining, described oil seal ring (60) covers described bearing outer ring (91) and described bearing inner race (92) Between space.

Electric tool the most according to claim 1, it is characterised in that described oil seal ring (60) Squeezed between the end face and the end face of described bearing inner race (92) of described gear (30) press solidly Fixed.

Electric tool the most according to claim 1 and 2, it is characterised in that described oil sealing The external diameter of ring (60) is more than the internal diameter of described bearing outer ring (91) but less than described bearing outer ring (91) external diameter.

Electric tool the most according to claim 1 and 2, it is characterised in that described oil sealing The radially outward edge of ring (60) and the end contact of described bearing outer ring (91).

Electric tool the most according to claim 1 and 2, it is characterised in that described oil sealing The radially outward edge of ring (60) is contactless with the end face of described bearing outer ring (91).

Electric tool the most according to claim 4, it is characterised in that described oil seal ring (60) For smooth annulus.

Electric tool the most according to claim 1 and 2, it is characterised in that described oil sealing Ring (60) is made up of plastics or synthetic fibers.

Electric tool the most according to claim 1 and 2, it is characterised in that described oil sealing Ring is by making the material of oil suction.

Electric tool the most according to claim 8, it is characterised in that described oil seal ring (60) It is made up of the rolling cardboard being used for manufacturing motor.

Electric tool the most according to claim 1 and 2, it is characterised in that described electricity Power driven tools is angle grinding machine, and described gear is helical gear.

11. 1 kinds of electric tools, comprising:

Motor, described motor has motor shaft (20)；And

Gear-box (10), described motor is positioned at described gear-box (10) outward, and described motor shaft (20) stretching in described gear-box (10), described motor shaft (20) is via a rolling bearing It is supported by relative to described gear-box (10), bearing outer ring (91) phase of described rolling bearing For described gear-box (10) fix, the bearing inner race (92) of described rolling bearing relative to Described motor shaft (20) is fixed, and a gear (30) is arranged in described gear-box (10) On described motor shaft (20), it is characterised in that the oil seal ring (60) of a metal is set in institute State motor shaft (20) and above and be fixed on described gear (30) by described gear (30) extruding And between described rolling bearing, see in being perpendicular to the plane of axis of described motor shaft (20) Examining, described oil seal ring (60) covers described bearing outer ring (91) and described bearing inner race (92) Between space, and the radially outward edge of described oil seal ring (60) and described bearing outer ring (91) End face contactless.

12. electric tools according to claim 11, it is characterised in that described oil seal ring (60) in circular cone flare form, and described oil seal ring (60) deviates from institute with described circular cone enlarging The mode stating rolling bearing is arranged between described gear (30) and described rolling bearing.

13. according to the electric tool described in claim 11 or 12, it is characterised in that described Electric tool is angle grinding machine, and described gear is helical gear.

14. 1 kinds of electric tools, comprising:

Motor, described motor has motor shaft (20)；And

Gear-box (10), described motor is positioned at described gear-box (10) outward, and described motor shaft (20) stretching in described gear-box (10), described motor shaft (20) is via a rolling bearing It is supported by relative to described gear-box (10), bearing outer ring (91) phase of described rolling bearing For described gear-box (10) fix, the bearing inner race (92) of described rolling bearing relative to Described motor shaft (20) is fixed, and a gear (30) is arranged in described gear-box (10) On described motor shaft (20), it is characterised in that the oil seal ring (60) of a metal is set in institute State motor shaft (20) and above and be fixed on described gear (30) by described gear (30) extruding And between described rolling bearing, see in being perpendicular to the plane of axis of described motor shaft (20) Examining, described oil seal ring (60) covers described bearing outer ring (91) and described bearing inner race (92) Between space, and the surface at least towards described rolling bearing of described oil seal ring (60) There is wear-resisting and that coefficient of friction is low coating.

15. electric tools according to claim 14, it is characterised in that described electronic work Tool is angle grinding machine, and described gear is helical gear.