CN201789368U

CN201789368U - Power tool with spindle lock

Info

Publication number: CN201789368U
Application number: CN2010205209862U
Authority: CN
Inventors: 施照军; 俞天
Original assignee: Techtronic Industries Co Ltd
Current assignee: Techtronic Industries Co Ltd
Priority date: 2010-09-06
Filing date: 2010-09-06
Publication date: 2011-04-06
Anticipated expiration: 2020-09-06

Abstract

Disclosed is a spindle lock with a brake device. The brake device comprises elastic parts acting on projections, each projection is jointed to one of a pair of recesses so as to control and buffer rotation of a spindle and delay jointing of a lock part. The utility model provides a power tool comprising the spindle lock. As a first rotor is provided with the recesses and a second rotor is provided with the elastic parts and the projections, the mechanical device is high in modularization and compact in structure and is reliable. Each elastic part is an arm which is symmetrical to all radial planes of a radial axis.

Description

Power tool with lock spindle

Technical field

The utility model relates to power tool, more specifically, relates to a kind of power tool that is used to prevent the lock that main shaft rotates that has.

Background technology

Typical rotary power tool comprises: housing, and by the motor of this housings support, and the main shaft that rotatably supports and drive selectively by described motor by described housing.Tool rack (as chuck) is installed on the front end of main shaft, and tool elements (as drill bit) is installed in the chuck.

For help the operator to dismantle and/or the erecting tools frame on tool elements, power tool can comprise lock spindle, when the operator applied active force with the extracting tool element to tool rack, described lock spindle can prevent the rotation of main shaft with respect to housing.Lock spindle can be manually operated lock spindle, and wherein, the operator is engaged in main shaft with lock assembly, to prevent the rotation of this main shaft; Perhaps, lock spindle can be the automatic spindle lock, when the operator applies active force to tool rack, and the action of described automatic spindle lock.

The automatic spindle lock that number of different types is arranged at present.A kind of automatic spindle lock comprises a plurality of wedge shape rollers, when the operator applies active force to tool rack, wedge shape roller is fixed to corresponding wedge-shaped surface engages.Engagement toothed elements in another kind of automatic spindle lock comprises, for example Gu Ding internal gear and movably toothed elements, this removable toothed elements is supported on the main shaft, is used for rotating together with main shaft, and meshes to prevent the locked position of main shaft rotation with respect to main axle moving to tooth.

In order to hold this automatic spindle lock, need rotate play or mobile space with being provided with between the driving of motor cooperates at main shaft.Lock spindle this between the driving of main shaft and motor cooperates rotates freely action in the scope of angle (engage and separate).

One of above-mentioned automatic spindle lock independently problem be, when the running status that drives from main axis rotation when motor is transformed into non-operating state, still the inertia of Xuan Zhuan main shaft (and tool elements of tool rack and/or support) can make the automatic spindle interlocking close, thereby prevents that main shaft rotating freely in the angular range between main shaft and motor from rotating with respect to motor.The joint of lock spindle may take place suddenly, and the parts of lock spindle are bumped, and causes the generation of noise (big " click " sound), and the potential hazard of the parts of infringement lock spindle is arranged.

The inertia that acts on main shaft big more (that is, using bigger tool elements, as hole saw), then the problems referred to above are serious more.Because the tool elements of big inertia, main shaft may be rebounded owing to (lock spindle engages) collision, thereby rotates (through rotating freely angle) along opposite direction, and the driving joint of collision motor, and (along direction) rebounds, thereby is engaged in lock spindle again.After initial collision and big " click " sound, to lock spindle and can cause " buffeting " phenomenon at main shaft with collision repeatedly between motor-driven engages.

Another of existing power tool independently problem is, when motor when running status is transformed into non-operating state, braking force may act on motor, and main shaft (under the effect of the inertia force of the tool elements of main shaft and tool rack and/or installation) continues to rotate through free angle.The braking of motor (with the lasting rotation of main shaft) is closed the automatic spindle interlocking, and produces noise (big " click sound " and/or " buffeting "), but also may cause potential damage to parts.

The braking force that acts on motor may be produced by the dynamic braking of motor, for example by the operation of dynamic braking circuit, perhaps causes the operation (stopping) of (battery powered) wireless power tool.In other words, when motor stops, making the active force (inertia of the tool elements of main shaft and tool rack and/or installation) of main axis rotation and make the difference between the motor active force out of service (promptly no matter motor slips to go by inertia is still braked) that the automatic spindle interlocking is closed.When lock spindle engaged, the difference of these two opposite effect power was big more, generation collision (big " click sound " and/or " buffeting ") strong more.

In order to address the above problem, United States Patent (USP) discloses a kind of power tool that has lock spindle for the 7 063 No. 201.This lock spindle comprises spring and brake mechanism, is used to control and cushion the rotation of main shaft, and be used to postpone retaining mechanism just transporting the row and the operating joint that reverses.A plurality of spring parts can cooperate jointly and apply active force, to postpone the action of lock spindle.But, have been found that the defective that this lock spindle occurs is, buffering torque meeting changes according to the rotation direction of main shaft, though this may have a positive effect, for example be used to stop the rotation of forward, this can provide a kind of buffering of suboptimum on opposite direction.In the instrument of the prior art, buffer spring spare for example is integrally formed on the plane rotor that is formed by sheet material (as spring steel), and this is because this can provide the assembling of axial dimension compactness.The hub of described spring part and rotor is whole to be formed, and for to install asymmetricly, as shown in Figure 7.Each spring part is the form of the circumferential bow-shaped arm that extends, and hub is fixed in the inner of this bow-shaped arm, and has the detent bumps of radially extending from its end.In use, this detent bumps can move between the depressed part of a pair of complementation, to be used to provide buffering.Therefore, it is the cantilever beam element substantially that this spring part can be considered to, and each cantilever beam element has the radial dimension of the degree of depth (depth) that limits described beam, and by the narrow relatively beam width that thickness limited of described sheet material.Similarly, the easy flexural deformation of these spring parts is arrived outside the plane of described sheet material, and if this flexural deformation generation, also can further have influence on the shock-absorbing capacity that depends on operative orientation.The purpose of this utility model is solution or improves above-mentioned defective substantially, a kind of improved lock spindle perhaps more generally is provided.

The utility model content

According to an aspect of the present utility model, a kind of power tool is provided, this power tool comprises:

Housing;

Motor, this motor is by described housings support and comprise motor shaft;

Main shaft, this main shaft are by described housings support, and to rotate around longitudinal axis, described main shaft is driven selectively by described motor, thereby rotates up at opposite first direction and second party around described longitudinal axis;

First locking member;

Second locking member, this second locking member can move between locked position and unlocked position, and at described locked position, described second locking member engages with described first locking member, to prevent the rotation of described main shaft;

Transmission device, this transmission device is used for transmitting torque between described motor shaft and described main shaft, described transmission device comprises second rotor that the first rotor and contiguous this first rotor are installed, the described the first rotor and second rotor coaxial are installed, in order to limit this first rotor and the rotation relative to each other of second rotor;

Many to depressed part, every pair of depressed part comprises and is arranged on described second epitrochanterian first depressed part and second depressed part,

Described the first rotor comprises that hub, inside end are fixed in the elastic arm of this hub, are positioned at the projection on the outer end of each described arm, each projection is biased into one that selects in described first depressed part and second depressed part by described elastic arm, when active force puts on described main shaft so that described main shaft during with respect to the rotation of described motor shaft, described elastic arm can move, and is used to postpone described second locking member from described unlocked position moving to described locked position; It is characterized in that, each described elastic arm is about the sagittal plane symmetry separately at described longitudinal axis place, thereby when described main shaft rotates with respect to described motor shaft on described first direction, each projection can move between the primary importance and the second place, this primary importance corresponding to the described unlocked position of described second locking member and in described primary importance each projection be arranged in described first depressed part, each projection is arranged in described second depressed part in the described second place, each described projection from described second locking member of the motion delay of described first depressed part from of the motion of described unlocked position to described locked position; And, when described main shaft on described second direction during with respect to the rotation of described motor shaft, each projection can move between the described second place and described primary importance, this second place corresponding to the described unlocked position of described second locking member and in the described second place each described projection be arranged in described second depressed part, each described projection is arranged in described first depressed part in described primary importance, each described projection from described second locking member of the motion delay of described second depressed part from of the motion of described unlocked position to described locked position.

Have been found that in this way symmetry installs described elastic arm, the buffering torque that described device can provide not the rotation direction according to main shaft to change.

Preferably, that described hub is essentially the plane and align with transverse plane transverse to described longitudinal axis, and each elastic arm be essentially the plane and with the arm planar registration that favours described transverse plane.Preferably, each described arm plane is substantially perpendicular to described transverse plane.Preferably, on described many radially outer surfaces that is arranged on described elastic arm that depressed part is arranged in described the first rotor.

Preferably, each described projection has the shape of part sphere.Preferably, described elastic arm is along circumferentially equally spaced apart.

Preferably, described hub comprises the centre bore that is used to receive described main shaft, and described main shaft and hole have complementary plane, are used to prevent the rotation of described hub with respect to described main shaft.

Preferably, described first locking member comprises wedge shape roller, brake(-holder) block etc., described second locking member comprises inclined-plane, wedge shape part, bar etc., and this second locking member engages with described first locking member and described first locking member is contacted with the periphery of rotation, to prevent the rotation of described main shaft.

Preferably, described transmission device comprises that also by the shaft-driven reduction gearing transmission device of described motor, one or more outputs of this reduction gearing transmission device drive in described internal rotor and described second rotor.Preferably, described second rotor is fixed in described one or more output, and together rotates with these one or more outputs.Preferably, described gear drive comprises a planetary gearsets at least, and described output comprises the wheel shaft of support planetary gears, and this wheel shaft is fixed in described second rotor and together rotates with this second rotor.

Preferably, described first depressed part and second depressed part are circumferentially spaced apart in the outer surface upper edge of described the first rotor, and described projection is from the inner surface extension of described second rotor.Owing to have the spaces that can be used for installing described elastic arm on second rotor, this provides a kind of design of compactness more.

Preferably, described first depressed part and the second depressed part portion of being highlighted in the described the first rotor separate, and this protuberance has the shape about the sagittal plane reflective symmetry of dividing described protuberance equally.

The utility model provides a kind of lock spindle of power tool efficiently that is used to be in operation.Have been found that the torque between the internal rotor and second rotor can more stably be maintained.And correspondingly, in the whole life-span of instrument, very little variation only can take place or not change in the delay that is provided by the described elastic arm that is installed on this device.By the first rotor that is located substantially in described second rotor is provided, under the prerequisite of not destroying described instrument compact in design, also can keep this advantage.In addition, owing to reached the modularization of height, so just can allow to use a plurality of common components but use different elastic arms that multiple power tool is provided, thereby rotate freely at internal rotor and external rotor that the breakdown torque according to instrument changes the torque that acts between internal rotor and the external rotor in the angle.

Description of drawings

By embodiment preferred implementation of the present utility model is described with reference to the accompanying drawings.

Fig. 1 is the schematic cross-section by the fore-and-aft plane of the driving axis of power tool;

Fig. 2 is the perspective exploded view of the first rotor and second rotor assembly of instrument shown in Fig. 1;

Fig. 3 is the end-view of the driving rotor of instrument shown in Fig. 1;

Fig. 4 is the end-view of the first rotor of instrument shown in Fig. 1;

Fig. 5 is the constitutional diagram along the partial cross section figure of plane AA among Fig. 1 and BB intercepting;

Fig. 6 replaces the internal rotor of form power tool and the stereogram of external rotor assembly according to first kind;

Fig. 7 is the end-view of rotor with prior art of integral type elastic arm;

Fig. 8 is the perspective view according to the first rotor of instrument shown in Figure 1 of the present utility model;

Fig. 9 is the perspective view according to second rotor of instrument shown in Figure 1 of the present utility model;

Vertical view after Figure 10 will be assembled together according to Fig. 8 of the present utility model and rotor shown in Figure 9.

Embodiment

With reference to accompanying drawing, Fig. 1 schematically shows has the power tool that a kind of the utility model relates to the lock spindle system 10 of type.As shown in Figure 1, described power tool comprises housing 11 and the motor 12 that is supported in this housing 11.Main shaft 13 is rotatably supported by housing 11, and can be by motor 12 reverse drive.Tool rack or chuck (not shown) can be supported on main shaft 13 foremost, to rotate together with main shaft 13.Power tool can be drill bit (as shown in the figure), or the power tool of other type, for example screwdriver (screwdriver), grinder or router (router).

Motor 12 comprises output shaft 12a, and this output shaft 12a is limited with electrical axis 14 and is connected in planetary gear speed reducing mechanism 15, and this planetary reduction gear 15 comprises: sun gear 16, and this sun gear 16 is as being connected in output shaft 12a by spline; Planetary gear 17, this planetary gear 17 supports by being fixed in the wheel shaft 50 that drives the rotor or second rotor 18, and can and be fixed in engagement between the ring gear 99 of housing 11 at sun gear 16.Therefore second rotor 18 provides " planet carrier " that rotates with described motor shaft 12a, and wheel shaft 50 is the output block to second rotor, 18 transmitting torques.

Lock spindle system 10 is arranged on the outlet side of reducing gear 15, and comprise driving torque mechanism 10 ' and retaining mechanism 10 "; driving torque mechanism 10 ' be used for torque being passed to main shaft 13 from second rotor 18, retaining mechanism 10 " be used to lock main shaft 13 and prevent that selectively main shaft 13 is with respect to housing 11 with respect to the rotation of second rotor 18.

The public connector 19 that driving torque mechanism 10 ' between the main shaft 13 and second rotor 18, this driving torque mechanism 10 ' comprise are formed on main shaft 13 ends two parallel surfaces 20 of alignment of shafts axis two opposite sides (as be positioned at) and be formed on female connectors 22 on second rotor 18.Connector 22 has the sidewall that is used for providing free angle 23 (being about 20 at this free angle of illustrated structure spends), and the main shaft 13 and second rotor 18 can relatively rotate in this free angle 23, to provide the rotation play between the main shaft 13 and second rotor 18.When

connector

31 and 32 engages, can produce the space that rotates freely that second rotor 18 can not pass to revolving force main shaft 13, but in this rotated freely the space, second rotor 18 can rotate free angle 23 relatively with main shaft 13.In illustrated structure, the shape of connector 22 is provided at motor 12 and main shaft 13 this play on two direction of rotation.

Retaining mechanism 10 " mainly comprises: the release member 24 that is fixed in second rotor 18; one or more springs 25 (using five springs in the illustrated embodiment); the projection or the sphere 30 that are associated with each spring 25; one or more locking members or wedge shape roller 26; lock ring 27; rubber ring 28, retainer ring 29, brake rotors or the first rotor 31 and main shaft 13.Except wedge shape roller 26 and main shaft 13, retaining mechanism 10 " miscellaneous part be generally the annular of extending around alignment of shafts axis.Be understandable that accompanying drawing just schematically illustrates retaining mechanism 10 " critical piece, and for purpose clearly, and omitted other minor components.

Lock ring 27 and the first rotor 31 all comprise with main shaft 13 on the female connectors 32 of connector 19 complementations, thereby lock ring 27 and the first rotor 31 can both be along with main shaft 13 high speed rotating.On outer circumference surface, lock ring 27 comprises a plurality of separation projectioies 34, and in illustrated structure, it is equally spaced apart with the angle of 90 degree each other to separate projection 34.At each circumference of each projection 34, be limited with the inclination locking wedge-shaped surface 35a and the 35b that are used to provide locking surface, thereby lock spindle system 10 can lock main shaft 13 on positive veer and reverse directions.Wedge-shaped surface 35a tilts towards relevant projection 34 with 35b.

In illustrated structure, locking member is the wedge shape roller 26 that forms cylinder form.Wedge shape roller 26 is provided for each locking wedge-

shaped surface

35a and 35b of lock ring 27.Wedge shape roller 26 is set to four pairs, and every pair is used for each projection 34.A wedge shape roller in the every pair of wedge shape roller 26 is provided at the locking member on the positive veer of main shaft 13, and this is provided at the locking member on the reverse directions of main shaft 13 to another wedge shape roller in the wedge shape roller 26.

Rubber ring 28 is arranged in the groove of retainer ring 29, because the frictional force between wedge shape roller 26 and the rubber ring 28, the joint of wedge shape roller 26 and rubber ring 28 can cause the rotation of wedge shape roller 26.Retainer ring 29 is limited with the inner peripheral surface 36 that is used to hold lock ring 27.The inner peripheral surface 36 of retainer ring 29 faces one another in radial direction with the outer circumference surface of lock ring 27 (and/or main shaft 13), and be separated with given radial distance, thereby a pair of wedge shape roller 26 is between the pair of angled

locking cleat planes

35a and 35b and inner peripheral surface 36 of lock ring 27.

The locking cleat planes 35a that tilts and the inner peripheral surface 36 of 35b and retainer ring 29 cooperatively interact, with 10 the corresponding locked position of locking state with wedge shape roller 26 wedging and lock spindle system, at this locked position, can prevent that main shaft 13 is with respect to housing 11 and with respect to the rotation of the motor 12 and second rotor 18.Be provided with the space between the inner peripheral surface 36 of retainer ring 29 and the outer circumference surface of lock ring 27, to allow wedge shape roller to move to 10 corresponding release of released state or unlocked position with the lock spindle system, at this release or unlocked position, main shaft 13 can rotate freely with respect to housing 11.

Release member 24 comprises release projection 39, and this release projection 39 can engage with wedge shape roller 26 selectively, so that wedge shape roller 26 is discharged or release from locked position.In illustrated structure, release projection 39 is equally spaced apart with the angle of about 90 degree each other, with the relative position corresponding to four pairs of wedge shape rollers 26.Each release projection 34 is designed to: by engaging of wedge shape roller 26 and circumferential ends, promote wedge shape roller 26 on release member 24 rotation direction of (with second rotor 18), thereby discharge or wedge shape roller 26 that release is relevant.The circumferential length of each release projection 34 limits, thereby can realize discharging or unlocking function in the scope that rotates freely angle 23 between main shaft 13 and the release member 24 and second rotor 18.Preferably, closing on terminal point realization release or the unlocking function that rotates freely angle 23.

Brake rotors or the first rotor 31 are arranged on usually and drive in the rotor or second rotor 18, and cooperatively interact with this driving rotor or second rotor 18, brake apparatus or controlling organization with the elastic force that is provided for control spring 25, wherein, described spring 25 is between corresponding to the application position of the released state of described lock spindle system 10 and the application position corresponding to 10 locking state of lock spindle system.In illustrated structure, on the outer circumference surface of the first rotor 31, be limited with control depressed part 40 and 41.Around the first rotor 31 along circumferentially being separated with five pairs of

depressed parts

40,41 between equally.The protuberance (lobe) 42 that the every pair of

depressed part

40,41 is extended radially outwardly separates, and this protuberance 42 has the shape about sagittal plane 43 reflective symmetry (reflective symmetry) of dividing this protuberance 42 equally.

Second rotor 18 comprises five equal angles groove 44 at interval, and this groove 44 radially extends.The axially extending bore that connects second rotor 18 is stepped, and have exterior section and adjacent interior section 60, this exterior section provides female connectors 22, and described interior section 60 has lateral dimension greater than the inner surface 45 of connector 22 and be applicable to and receive the first rotor 31.Spring 25 is contained in each groove 44 and with sphere 30 and engages, thereby makes at least a portion of sphere 30 extend from inner surface 45.Spring 25 provides elastic force, engages with a depressed part of selection in

depressed part

40 and 41 with bias voltage projection or sphere 30.Groove 44 face vertically is open, and the interior section in groove 44b and hole 60 is fixed in baffle ring 48 sealings of second rotor 18 by (as passing through securing member).

When motor 12 restarts, allow described projection to move to another one depressed part (being depressed part 40) from a depressed part (being depressed part 41) by the torque that joint produced between sphere 30 and the depressed part 40,41.When described motor 12 stops, the elastic force of 25 pairs of spheres 30 of spring is set to allow sphere 30 to move to another one depressed part (being depressed part 41) from a depressed part (being depressed part 40), with the revolving force of control and buffering main shaft 13, and postpone retaining mechanism 10 " joint.

Be in operation, when second rotor 18 during in the rotation of the direction (see figure 5) of the driving lower edge of motor 12 arrow X, the end that corresponding wedge shape roller 26a is released projection 34 advances release or the unlocked position of the inclined surface 35a of lock ring 27.The inner peripheral surface 36 of another wedge shape roller 26b and retainer ring 29 keeps in touch, and by this CONTACT WITH FRICTION, wedge shape roller 26b is pulled to the off-position of inclined surface 35b.In the scope that rotates freely angle 23 between main shaft 13 and second rotor 18 and motor 12, realize discharging or unlocking function.

" after release or the release, the connector 32 of second rotor 18 and the connector 31 of main shaft 13 enter the driving engagement state, so that the actuating force of second rotor 18 (with motor 12) passes to main shaft 13, and main shaft 13 together rotates with second rotor 18 at retaining mechanism 10.At this moment, each sphere 30 is arranged in a depressed part (being depressed part 40, " motion " position depressed part) of the first rotor 31, and is positioned at the free angle terminal point and discharges or the elastic force control release member 24 of the spring 25 of unlocked position and the position of lock ring 27.

In the driving running of motor 12, release projection 34 provides wedge shape roller 26a shifted onto and discharges or the necessary active force of unlocked position, and does not provide and act on impulsive force bigger on the wedge shape roller 26a.(switch to non-operating state from running status) when motor 12 stops, second rotor 18 stops operating.The rotation of main shaft 13 is controlled and is cushioned by the elastic force that is used for sphere 30 is remained on the spring 25 of selected depressed part (being depressed part 40).In stopped process, if the inertia of main shaft 13 (and install chuck and cutter) less than the elastic force of spring 25, then main shaft 13 stops operating, and sphere 30 remains in the selected depressed part (being depressed part 40, the shift position).In this case, even have very little relative rotation or not rotation relatively between main shaft 13 and second rotor 18 and motor 12, the elastic force of spring 25 also can cushion and control the inertia of main shaft 13.

When the inertia of main shaft 13 (and install chuck and cutter) during greater than the elastic force of spring 25, this inertia overcomes the elastic force and the sphere 30 of spring 25 and is close in frictional force between the inclined surface of selected depressed part 40, thereby sphere 30 moves to another depressed part 41 (" locking " position depressed part) from depressed part 40.The moment of inertia of sphere 30 mobile opposing main shaft 13 of 41 from depressed part 40 to depressed part, and the moment of inertia of control and buffering main shaft 13 " stop operating before engaging thereby make main shaft 13 at retaining mechanism 10.

Therefore, the moment of inertia of main shaft 13 (and install chuck and cutter) by sphere 30 under the situation of the elastic force that applies at each spring 25 in each depression 40 joint and control and cushion to moving of depressed part 41.The revolving force of spring 25 control main shafts 13, and delay wedge shape roller 26 and the joint of locking wedge-shaped surface 37, thereby not collision in the parts of lock spindle system 10, and when main shaft 13 stops operating, can not produce noise (not having big " click " sound) yet.Simultaneously, because the revolving force of main shaft 13 is controlled,, thereby also avoid occurring " buffeting " phenomenon so lock spindle does not have collision and rebounding in the scope that rotates freely angle 23.

Depressed part

40 and 41 and the brake mechanism that provided of sphere 30 are provided the rotating control assembly of lock spindle system 10, and the elastomeric spring power that provided of spring 25.

When the operator operated chuck, this can cause easily that main shaft 13 has the rotation with respect to second rotor 18, but because retaining mechanism 10 " effect, can prevent the rotation of main shaft 13.Wedge shape roller 26 is wedged between inclination locking wedge-shaped surface 35a, the 35b of correspondence of the inner peripheral surface 36 of retainer ring 29 and lock ring 27, thereby can prevent the rotation of main shaft 13 on each direction.Because main shaft 13 can not rotate, thereby can easily operate chuck, with dismounting and/or installation drill bit.

When motor 12 restarted, the end of release projection 34 (on the direction of rotation of selecting) moved to the off-position with a wedge shape roller 26a.Other wedge shape roller 26b is engaged in the inner peripheral surface 36 of retainer ring 29 and is pulled to the off-position.In case discharge wedge shape roller 26, main shaft 13 just can rotate freely.Under the effect of the actuating force of motor 12, the destination county rotation of the rotation free angle 23 of main shaft 13 beginnings between main shaft 13 and second rotor 18 and motor 12.

When driving described main shaft 13, wedge shape roller 26 is during around the rotation of separately axis and around main shaft 13 rotations, wedge shape roller 26 keeps in touch with rubber ring 28, and this contact resistance is rotating wedge shape roller 26 around their axis separately in described main shaft 13 rotations.This rotation of wedge shape roller 26 and making each axis of wedge shape roller 26 remain on the orientation of the axis that is basically parallel to main shaft 13 with the engaging of support boss 38 of support ring 23 on the end portion of each wedge shape roller 26.

Fig. 6 represents that first replaces the power tool of form, and this power tool has internal rotor 131 and external rotor 118, and internal rotor 131 and external rotor 118 have structure and the method for operation similar to internal rotor 31 and external rotor 18 among Fig. 1-5.But on this power tool,

depressed part

40,41 is arranged on (rather than on internal rotor) on the external rotor 118, and spring 25 and sphere 30 are arranged on (rather than on external rotor) on the internal rotor 131.

Depressed part

40,41 is provided with along circumferential at the inner surface 45 of the groove 60 that receives internal rotor 131 at interval with relevant protuberance 42.Internal rotor 131 comprises five radial projection 70, has groove on each projection, and spring 25 and sphere 30 are arranged in this groove.

Fig. 8 to Figure 10 represents a kind of preferred implementation of the present utility model, and show that described the first rotor 231 cooperatively interacts in the mode similar to the described rotor shown in Fig. 6 with second rotor 218 according to the first rotor 231 of the present utility model and second rotor 218 that matches.Therefore, identical with the parts of the said goods parts are by identical reference number indication.The first rotor 231 comprises hub 155, has female connectors 32 in the center of this hub 155.Hub 155 and extends around female connectors 32 ringwise.Hub 155 was both thin and flat, and alignd with the transverse plane (not shown) transverse to longitudinal axis 14.Inside end is fixed in the elastic arm 125 of hub can be integrally formed with described hub 155.Each arm 125 is essentially flat, and aligns with the arm plane (not shown) of the transverse plane that favours hub 155.Elastic arm 125 is along circumferentially being provided with equally spacedly, and each arm 125 is about by each indicated sagittal plane symmetry of dotted line 156,157,158, and longitudinal axis 14 is arranged in described each sagittal plane and each dotted line is divided each arm equally.The outer end of each arm is provided with projection 140, and this projection 140 is illustrated as the part sphere of being divided equally by plane 156-158.Each projection 140 is biased in first depressed part 40 that is arranged on second rotor 218 and second depressed part 41 selected one by elastic arm 125.With structural similarity shown in Figure 6, paired depressed part 40,41 be illustrated as be positioned at the first rotor be arranged on elastic arm 125 radially outer surperficial 159 on.

Below only be to have described aspects more of the present utility model in the mode of example, it should be understood that under the prerequisite that does not break away from scope of the present utility model, can make various improvement and interpolation the utility model.

Claims

1. power tool, this power tool comprises:

Housing;

Motor, this motor is by described housings support and comprise motor shaft;

First locking member;

2. power tool according to claim 1, it is characterized in that, that described hub is essentially the plane and align with transverse plane transverse to described longitudinal axis, and each elastic arm be essentially the plane and with the arm planar registration that favours described transverse plane.

3. power tool according to claim 2 is characterized in that, each described arm plane is substantially perpendicular to described transverse plane.

4. power tool according to claim 2 is characterized in that, on described many radially outer surfaces that are arranged on described elastic arm that depressed part are arranged in described the first rotor.

5. power tool according to claim 3, it is characterized in that, on described many radially outer surfaces that is arranged on described elastic arm that depressed part is arranged in described the first rotor, and described hub comprises the centre bore that is used to receive described main shaft, described main shaft and hole have complementary plane, are used to prevent the rotation of described hub with respect to described main shaft.

6. power tool according to claim 1 is characterized in that each described projection has the shape of part sphere.

7. power tool according to claim 1 is characterized in that, described elastic arm is along circumferentially equally spaced apart.

8. according to any described power tool in the claim 1 to 7, it is characterized in that described hub comprises the centre bore that is used to receive described main shaft, described main shaft and hole have complementary plane, are used to prevent the rotation of described hub with respect to described main shaft.

9. according to any described power tool in the claim 1 to 7, it is characterized in that, described first locking member comprises wedge shape roller, described second locking member comprises the inclined-plane, this inclined-plane engages with described first locking member and described first locking member is contacted with the periphery of rotation, to prevent the rotation of described main shaft.

10. according to any described power tool in the claim 1 to 7, it is characterized in that, described transmission device comprises also that by the shaft-driven gear drive of described motor one or more outputs of this gear drive drive in described internal rotor and described second rotor.

11. power tool according to claim 10 is characterized in that, described second rotor is fixed in described one or more output, and together rotates with these one or more outputs.

12. power tool according to claim 11, it is characterized in that, described gear drive comprises at least one planetary gearsets, and described output comprises the wheel shaft of support planetary gears, and this wheel shaft is fixed in described second rotor and together rotates with this second rotor.

13. according to any described power tool in the claim 1 to 7, it is characterized in that described first depressed part and second depressed part are circumferentially spaced apart in the outer surface upper edge of described the first rotor, and described projection is from the inner surface extension of described second rotor.

14., it is characterized in that described projection is bias voltage radially basically according to any described power tool in the claim 1 to 7.

15. according to any described power tool in the claim 1 to 7, it is characterized in that, described first depressed part and the second depressed part portion of being highlighted in the described the first rotor separate, and this protuberance has the shape about the sagittal plane reflective symmetry of dividing described protuberance equally.