CN104416544A

CN104416544A - Electric tool

Info

Publication number: CN104416544A
Application number: CN201310371499.2A
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: 2015-03-18
Anticipated expiration: 2033-08-23
Also published as: CN104416544B

Abstract

The invention discloses an electric tool. The electric tool comprises a motor and a transmission system, wherein the motor is provided with a stator, a rotor, an armature shaft and bearings, wherein the stator is arranged around the rotor; the rotor is mounted on the armature shaft; the bearings are arranged at two ends of the armature shaft; one end of the armature shaft is integrally provided with an output end for transmitting power; shaft sleeves are arranged between the part, which is close to the armature shaft, of the output end and the bearings and extend along the axial direction. The shaft sleeves are arranged between the armature shaft and the bearings, so that the rigidity of the armature shaft is enhanced; when a transmission gear of the output end is stressed by large torque, concession is not generated, and the transmission gear is still tightly meshed with a gear in the transmission system; the phenomenon of gear collision between the gears is avoided. Meanwhile, by a relatively conventional mode for enhancing the rigidity by increasing the diameter of the armature shaft, the use amount of raw materials is reduced, and the cost for processing and cutting is saved, so that the processing cost is also saved.

Description

Electric tool

Technical field

The present invention 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 be 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 needs to carry out big speed ratio design.Meanwhile, in order to take into account the ease for use of electric tool and portable demand, the volume of electric tool itself can not be excessive.Therefore, the volume that the diameter of the driven gear engaged with gear of output end is subject to electric tool limits, and in this case in order to ensure big speed ratio, usual way is the number of teeth that the diameter reducing armature shaft reduces clutch end gear simultaneously.

If electric tool is in overload or when there is abnormal stall, due to the characteristic that the torsion had during machine operation along with the increase motor of load also increases simultaneously.When the gear of output is when being subject to large torsion, output is by excessive reaction radial load, because minor diameter motor shaft cantilever rigidity is not enough, even if the output that travelling gear produces the phenomenon armature shaft made a concession departs from original position, make the gears meshing between output and transmission speed system not closely and then produces the phenomenon of beating tooth, the transmission performance of travelling gear serious wear reduction in the course of time even occurs cannot the phenomenon of transmission.Above-mentioned phenomenon normally easily produces that skew causes because the insufficient rigidity armature shaft output of armature shaft when there is abnormal work is stressed, general by increasing part armature shaft diameter raising rigidity, but increase to the consumption of raw material the cutting output that axle is processed so also to increase, especially baroque armature shaft cost can exceed much simultaneously.Therefore, need for solving the problem to propose a kind of rigidity that can either improve armature shaft, again can the scheme that reduces costs of hinge structure.

Summary of the invention

The invention provides a kind of electric tool to comprise for solving the problem, motor, transmission system; Motor has, stator, rotor, armature shaft, bearing; Stator is arranged around rotor, and rotor is arranged on armature shaft, and the two ends of armature shaft arrange bearing, and one end of armature shaft arranges the output for transmitting power integratedly; And arrange axle sleeve between the position of the armature shaft that output is close and bearing, 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 coordinated with output, and axle sleeve extends to the position near driving member.

Bearing, between armature shaft and axle sleeve be interference fit connect.

Output is the gear be wholely set with armature shaft.

Described axle sleeve and bearing and armature shaft synchronous rotary during machine operation.

Above-mentioned axle sleeve is arranged between armature shaft and bearing, the rigidity of armature shaft is strengthened, the travelling gear of output can not produce yielding when being subject to large torsion, and travelling gear and the gear in transmission system still engage closely, there will not be the phenomenon of beating tooth between gear.Simultaneously relatively traditional mode being increased rigidity by the diameter increasing armature shaft, save the consumption of raw material, eliminate the cost that processing is cut, therefore the technical program also has the technique effect significantly reduced costs.

Accompanying drawing explanation

Fig. 1 is electric tool complete machine schematic diagram.

Fig. 2 is the motor generalized section used in electric tool.

Fig. 3 is rotor schematic diagram.

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

Detailed description of the invention

With reference to the chain saw shown in Fig. 1, chain saw has a casing 61, and form handle 611 at the afterbody of casing, the head of casing is provided with guide plate 612, and this guide plate is provided with the groove (not shown) of installing chain 610.The casing closing on guide plate 612 is provided with protective plate 613, and the cutting foreign material produced when protective plate is for preventing chain saw from working are splashed to user's health.The rear portion of protective plate is 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 portion and be provided with a power brick 619, this power brick is made up of multiple lithium battery group.The periphery of power part 614 is provided with auxiliary handle 615, there is between auxiliary handle and power part 614 larger space and grip auxiliary handle easily to enable the hand of operator.Handle is 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 is arranged around rotor 2, and rotor comprises the commutator 21 being 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 the upper end 12 of stator 1 and lower end 13, two bearings 14,14 ' is set, the inside of stator is also provided with permanent magnet 15, magnet ring rotor is arranged, and the coil that can produce magnetic field can also be used to replace this permanent magnet, in order to make rotor 2 be in magnetic field environment during machine operation.

With reference to the output 31 that Fig. 3 and Fig. 4 is output motor power in the lower end of armature shaft 3, on output, one arranges travelling gear 32, travelling gear engages with the gear wheel 4 in the transmission system of the electric tools such as pruner, the armature shaft 31 closed 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 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 is convenient to adjust when installing and is made as armature bearing provides the activity space of a longitudinal direction, axle sleeve lower end 52 may extend to the top of travelling gear 32, even if axle sleeve 5 and travelling gear 32 form overlapping region.Above-mentioned axle sleeve 5 internal diameter is 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 top from 15, the upper surface of bearing 14 ', enhance 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.Simultaneously relative to traditional method being improved rigidity by the diameter increasing motor pivot, change the processing and manufacturing cost that scheme reduces motor pivot.

Above-described embodiment is one of the present invention preferably embodiment, the present invention can also have more embodiment, such as use longer axle sleeve to make axle sleeve extend to the top of travelling gear from the position higher than bearing upper surface, such as increase again the thickness of axle sleeve to obtain better rigidity.Technical solution of the present invention can also be applied to other field of power tools.In a word every meet the change that Spirit Essence of the present invention does all should in scope.

Claims

1. electric tool comprises, motor, transmission system; Described motor has, stator, rotor, armature shaft, bearing; Described stator is arranged around rotor, and rotor is arranged on armature shaft, and the two ends of armature shaft arrange bearing, and one end of described armature shaft arranges the output for transmitting 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 coordinated with output, and described axle sleeve extends to the position near driving member.

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

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

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