CN203438203U

CN203438203U - Electric tool

Info

Publication number: CN203438203U
Application number: CN201320517814.3U
Authority: CN
Inventors: 杨品; 孔钊
Original assignee: Suzhou Cleva Electric Appliance Co Ltd
Current assignee: Suzhou Cleva Electric Appliance Co Ltd
Priority date: 2013-08-23
Filing date: 2013-08-23
Publication date: 2014-02-19
Anticipated expiration: 2023-08-23

Abstract

An electric tool comprises a motor and a transmission system. The motor is provided with a stator, a rotor, an armature shaft and bearings. The stator is arranged around the rotor which is installed on the armature shaft. The bearings are arranged at the two ends of the armature shaft. The output end used for transmitting power is integrally arranged at one end of the armature shaft. A shaft sleeve is arranged between the part, close to the output end, of the armature shaft and the bearing at the corresponding end. The shaft sleeve extends in the axial direction. The shaft sleeve is arranged between the armature shaft and the bearings, the rigidity of the armature shaft is enhanced, a transmission gear at the output end will not recede when bearing large torsion, the transmission gear is still closely meshed with a gear in the transmission system, and the gear beating phenomenon between the gears is avoided. Meanwhile, compared with a traditional mode that the rigidity is increased by enlarging the diameter of the armature shaft, the electric tool has the advantages that the use number of raw materials is saved, the machining and cutting cost is saved, and therefore the machining cost can also be saved.

Description

Electric tool

Technical field

The utility model relates to a kind of electric tool.

Background technology

In existing electric tool, the motor of (such as electric chain saw) arranges clutch end on armature shaft, and common clutch end is the gear being wholely set with armature shaft.The electric tools such as electric chain saw are in order to adapt to its high capacity work, and transmission system need to be carried out big speed ratio design.Meanwhile, in order to take into account ease for use and the portable demand of electric tool, the volume of electric tool itself can not be excessive.Therefore, be subject to the volume restrictions of electric tool with the diameter of the driven gear of gear of output end engagement, in this case in order to guarantee big speed ratio, way is the number of teeth that the diameter that reduces armature shaft reduces clutch end gear simultaneously conventionally.

If electric tool in overload or while there is abnormal stall, has the characteristic that the torsion along with the increase motor of load also increases during due to machine operation simultaneously.When the gear of output is when being subject to large torsion, output is subject to excessive reaction radial load, because minor diameter motor shaft cantilever rigidity is not enough, even if producing the output of the phenomenon armature shaft of making a concession, travelling gear departs from original position, making the engagement of gear between output and transmission speed system not closely and then produce the phenomenon of beating tooth, even there is phenomenon that cannot transmission in the transmission performance of travelling gear serious wear reduction in the course of time.Normally the stressed easy generation skew of the insufficient rigidity armature shaft output of armature shaft causes above-mentioned phenomenon owing to there is abnormal work, general by increasing part armature shaft diameter raising rigidity, but like this consumption of raw material is increased to the cutting output that axle is processed simultaneously, also increase, especially baroque armature shaft cost can exceed a lot.Therefore, for addressing the above problem, a kind of rigidity that can either improve armature shaft, the scheme that prior art reduces costs relatively again need to be proposed.

Utility model content

For addressing the above problem the utility model, provide a kind of electric tool to comprise, motor, transmission system; Motor has, stator, rotor, armature shaft, bearing; Stator is around rotor setting, and rotor is arranged on armature shaft, and the two ends of armature shaft arrange bearing, and one end of armature shaft is provided for the output of transferring power integratedly; And between the position of the armature shaft that output is close and bearing, axle sleeve is set, axle sleeve extends vertically.

Axle sleeve extends to the top of output.

Align with the upper surface of bearing in one end of axle sleeve, the axle sleeve other end is near output top.

Electric tool has the driving member coordinating with output, and axle sleeve extends to the position near driving member.

Between bearing, armature shaft and axle sleeve, be that interference fit connects.

Output is the gear being wholely set with armature shaft.

Axle sleeve and bearing and armature shaft synchronous rotary described in during machine operation.

Above-mentioned axle sleeve is arranged between armature shaft and bearing, the rigidity of armature shaft is strengthened, when the travelling gear of output is subject to large torsion, can not produce yielding, the gear in travelling gear and transmission system still meshes closely, there will not be the phenomenon of beating tooth between gear.Simultaneously relatively traditional diameter that passes through increase armature shaft increases the mode of rigidity, has saved the consumption of raw material, saved the cost of processing cutting, so the technical program also has the technique effect significantly reducing costs.

Accompanying drawing explanation

Fig. 1 is electric tool complete machine schematic diagram.

Fig. 2 is the motor generalized section of using in electric tool.

Fig. 3 is rotor schematic diagram.

Fig. 4 is the partial enlarged drawing of the armature shaft that indicates in Fig. 2.

The specific embodiment

With reference to the chain saw shown in Fig. 1, chain saw has a casing 61, and at the afterbody formation handle 611 of casing, the head of casing is provided with guide plate 612, and this guide plate is provided with to install the groove (not shown) of chain 610.Close on the casing of guide plate 612 protective plate 613 is installed, protective plate is that the cutting foreign material that produce when preventing chain saw work are splashed to user's health.At the rear portion of protective plate, be provided with power part 614, a direct current generator and driving gear set are set in this power part.Close on power part 614 rear portions and be provided with a power brick 619, this power brick consists of a plurality of lithium battery groups.In the periphery of power part 614, be provided with auxiliary handle 615, between auxiliary handle and power part 614, there is larger space so that operator's hand can grip auxiliary handle easily.On handle, be also provided with trigger 617 and safety lock 618, safety lock 618 can prevent trigger false triggering when chain saw stopped status.

With reference to the motor M shown in Fig. 2, it comprises, stator 1, rotor 2, and armature shaft 3, rotor 2 is arranged on armature shaft 3.Stator 1 arranges around rotor 2, and rotor comprises the commutator 21 that is arranged on armature shaft upper end, and is arranged on the winding 22 of commutator bottom, and winding is around solid on iron core 24, and what be connected with commutator is carbon brush 25.In 12He lower end, the upper end of stator 1 13, two bearings 14,14 ' is set, the inside of stator is also provided with permanent magnet 15, permanent magnet surrounding rotor arranges, and can also use the coil that can produce magnetic field to replace this permanent magnet, during machine operation with so that rotor 2 in magnetic field environment.

With reference to Fig. 3 and Fig. 4, in the lower end of armature shaft 3, are outputs 31 of output motor power, on output, one arranges travelling gear 32, gear wheel 4 engagements in the transmission system of the electric tool such as travelling gear and pruner, the armature shaft 31 closing on travelling gear 32 is set in an axle sleeve 5, and axle sleeve is arranged in described bearing 14 '.Align with the upper surface 15 of bearing in the upper end 51 of axle sleeve 5, the upper end 51 of axle sleeve 5 also can be higher than bearing upper surface 15, the lower end 52 of axle sleeve 5 extends to the top of gear wheel 4 in transmission system, at the lower end 52 of axle sleeve 5 and the preset clearance G of gear wheel, this gap makes while being convenient to adjust to install to provide an activity space longitudinally for armature bearing, axle sleeve lower end 52 may extend to the top of travelling gear 32, even if axle sleeve 5 forms overlapping region with travelling gear 32.Above-mentioned axle sleeve 5 internal diameters are slightly larger than the diameter of armature shaft 3, and the external diameter of axle sleeve 5 is slightly less than the internal diameter of bearing 14 ', and axle sleeve, bearing and armature shaft are installed together by interference fit.During motor rotation, above-mentioned axle sleeve, bearing and armature shaft can synchronous rotaries.

Axle sleeve 5 extends to travelling gear 32 tops from 15 of the upper surfaces of bearing 14 ', strengthened the rigidity of armature shaft 3, during electric tool stall, armature shaft degrees of offset reduces, the yielding amplitude of travelling gear 32 also can reduce, and the engagement between the gear wheel 4 in travelling gear and transmission system still closely there will not be the phenomenon of beating tooth.With respect to traditional passing through, increase the method for the diameter raising rigidity of motor pivot simultaneously, change the processing and manufacturing cost that scheme has reduced motor pivot.

Above-described embodiment is a kind of preferably embodiment of the utility model, the utility model can also have more embodiment, for example use longer axle sleeve to make axle sleeve from the position higher than bearing upper surface, extend to the top of travelling gear, for example increase again the thickness of axle sleeve to obtain better rigidity.Technical solutions of the utility model can also be applied to other field of power tools.In a word every meet the change that the utility model Spirit Essence does all should be in the utility model protection domain.

Claims

1. electric tool, comprises, motor, transmission system; Described motor has, stator, rotor, armature shaft, bearing; Described stator is around rotor setting, and rotor is arranged on armature shaft, and the two ends of armature shaft arrange bearing, and one end of described armature shaft is provided for the output of transferring power integratedly; It is characterized in that: and between the position of the close armature shaft of described output and bearing, axle sleeve is set, described axle sleeve extends vertically.

2. electric tool according to claim 1, is characterized in that, described axle sleeve extends to the top of output.

3. electric tool according to claim 2, is characterized in that, aligns with the upper surface of bearing in one end of described axle sleeve, and the axle sleeve other end is near output top.

4. electric tool according to claim 3, is characterized in that, electric tool has the driving member coordinating with output, and described axle sleeve extends to the position near driving member.

5. electric tool according to claim 1, is characterized in that, is that interference fit connects between described bearing, armature shaft and axle sleeve.

6. electric tool according to claim 1, is characterized in that, described output is the gear being wholely set with armature shaft.

7. according to the electric tool described in claim 1 to 6 any one, it is characterized in that, during machine operation described in axle sleeve and bearing and armature shaft synchronous rotary.