CN201108969Y - Power tool - Google Patents

Abstract

The utility model discloses a power tool which includes a housing case, a drive shaft arranged in the housing case and a gripping head connected to the drive shaft, wherein, the gripping head comprises a center body with a head part and a tail part, the tail part is used for matching with the drive shaft, thereby ensuring that the center body rotates along with the drive shaft together, the head part comprises an axial hole and a plurality of channels which are arranged in angles and are intersectant with the axial hole, a plurality of holding jaws are positioned in the channels in a sliding way, a nut is rotationally installed on the center body through being matched with the screw threads of the holding jaws, and the rotation of the nut drives the holding jaws to move axially in the channels; the gripping head is only provided with a sleeve which axially reciprocates between a first position and a second position, when the sleeve is arranged below the first position, the nut can rotate oppositely to the housing case, and when the sleeve is arranged below the second position, the nut cannot rotate oppositely to the housing case. The gripping head is only provided with the sleeve, the structure is simple, the holding area of the sleeve is larger, the holding is labor-saving, and the operation is safe and convenient.

Description

Power tool

Technical field

The utility model relates to a kind of power tool, especially a kind of brill class or screwdriver class instrument with quick compression chuck.

Background technology

Traditional brill class or screwdriver class instrument have casing, are arranged on the driving shaft on the casing, are connected the chuck on the driving shaft, and chuck is used for the clamping device head.

U.S. Pat 6,073,939 have disclosed a kind of brill class or screwdriver class instrument with quick compression chuck, have casing and rotatable drive shaft, chuck is connected on the driving shaft, this chuck comprises the centerbody with head and afterbody, thereby described aft mounted being used for makes centerbody follow driving shaft to rotate with the driving shaft cooperation, described head comprises axial hole and some angled settings and the passage that intersects with described axial hole, some jaws slidably are positioned at each passage, each jaw comprises that a pawl face is formed at a side and thread-shaped is formed in opposite side, nut by with jaw on rotatable being installed on the described centerbody of threaded engagement, thereby make the rotation drive jaw of nut in passage, move axially, first sleeve, second sleeve, one in first sleeve and described second sleeve is axially back and forth between first state and second state.

At first state is under the manual state, and first sleeve is non-rotatable to be connected on the centerbody, and second sleeve is non-rotatable to be connected on the nut, and second sleeve is rotatable with respect to casing and centerbody.

At second state is under the auto state, non-rotatable being connected on nut and the housing in first sleeve and second sleeve, and rotatable with respect to centerbody.

The above-mentioned chuck that is used to bore on class or the screwdriver class instrument has two sleeves, manually during compression chuck, needs one to hold first sleeve, and another holds second sleeve, relatively rotates first sleeve and second sleeve is realized compression chuck; Automatically during compression chuck, need move axially in first sleeve and second sleeve and the relative casing of nut is fixed.

Above-mentioned chuck has two sleeves, complex structure, and also the gripping surface of each sleeve is less, grips relatively effort, inconvenient operation; During manual and automatic compression chuck, two mutual displacements of sleeve, the intersection of two sleeves hurts operator's hand easily.

The utility model content

The technical problems to be solved in the utility model: a kind of power tool with quick compression chuck of simple in structure, easy-to-operate is provided.

The technical scheme that its technical problem that solves the utility model adopts: a kind of power tool, comprise casing, be arranged on the driving shaft on the casing, be connected the chuck on the driving shaft, described chuck comprises the centerbody with head and afterbody, thereby described aft mounted being used for makes centerbody follow driving shaft to rotate with the driving shaft cooperation, described head comprises axial hole and some angled settings and the passage that intersects with described axial hole, some jaws slidably are positioned at each passage, each jaw comprises a pawl face and is formed at the screw thread of opposite side, nut by with jaw on screw thread cooperate rotatable being installed on the described centerbody, thereby make the rotation drive jaw of nut in passage, move axially, the axially movable axle sleeve that is set on the nut, described chuck only has a sleeve, described quill is to back and forth between the primary importance and the second place, sleeve is under primary importance, nut can rotate with respect to casing, sleeve is under the second place, and nut can not rotate with respect to casing.

The beneficial effects of the utility model: chuck only has a sleeve, and is simple in structure, and the gripping surface of sleeve is bigger, grip more laborsaving, and at manual or auto state, the operator only need grip sleeve on the other hand and make the sleeve axially reciprocating, easy-to-operate.

Preferably, described quill is to movably being set on the axle sleeve; Described chuck also comprises the fastening sleeve of close-fitting on nut, and described axle sleeve axially movably is set on the described fastening sleeve; Described fastening sleeve adjoins first projection and second projection that respectively extend radially outwardly out on the outer wall of two end faces, is formed with axially extended groove on the inwall of described axle sleeve, and described first projection and described axle sleeve groove connect; Fixedly install finite place piece on the front portion of described centerbody, described sleeve is provided with first ledge and second ledge, and described first ledge selectively connects with locating part, and described second ledge selectively connects with the end of axle sleeve; Flexible member is arranged between first ledge and the locating part; Described nut has front end face, and described centerbody is provided with annular protrusion, is provided with ball between the front end face of described nut and the annular protrusion.

Preferably, described power tool also comprises the clutch that is arranged on the casing; Described clutch comprises that at least one moves radially part; The described part that moves radially is ball or roller.

Ball or roller clutch, ball or roller and outer ring rolling friction, frictional force is little, consuming little energy.

Flexible member radially variable shape wherein, described clutch also comprises inner ring, outer ring and flexible member, and described inner ring is fixed on the casing, describedly moves radially part and described outer ring connects, to be arranged to move radially between part and the inner ring; Described flexible member is a spring; Described outer ring has first field of conjugate action and second field of conjugate action, describedly moves radially selectable and described first field of conjugate action of part and second field of conjugate action connects; Described power tool also has the baffle plate that fixedly installs with respect to casing, and described outer ring is arranged in the described baffle plate; Described outer ring is provided with axially extended end tooth, and described axle sleeve is provided with mounting hole, and mounting hole selectively meshes with the outer ring end tooth.

Description of drawings

Below in conjunction with drawings and Examples the utility model is carried out concrete elaboration.

Fig. 1 is the phantom of the utility model power tool first embodiment, and at this moment, the chuck of power tool is in the normal state.

Fig. 2 is the phantom of the utility model power tool first embodiment, and at this moment, the chuck of power tool is in manual state.

Fig. 3 is the phantom of the utility model power tool first embodiment, and at this moment, the chuck of power tool is in auto state.

Fig. 4 is collet segment and a clutch three-dimensional exploded view partly among the utility model power tool first embodiment.

Fig. 5 is the cutaway view of clutch among the utility model power tool first embodiment.

Fig. 6 is the phantom of the utility model power tool second embodiment, and at this moment, the chuck of power tool is in the normal state.

Fig. 7 is the phantom of the utility model power tool second embodiment, and at this moment, the chuck of power tool is in auto state.

The three-dimensional exploded view of collet segment and clutch part among Fig. 8 the utility model power tool second embodiment.

Fig. 9 is the stereogram of lock tube and sliding sleeve among the utility model power tool second embodiment.

Figure 10 is the cutaway view of clutch among the utility model power tool second embodiment.

Figure 11 is the phantom of the utility model power tool the 3rd embodiment, and at this moment, the chuck of power tool is in the normal state.

Figure 12 is the phantom of the utility model power tool the 3rd embodiment, and at this moment, the chuck of power tool is in manual state.

Figure 13 is the phantom of the utility model power tool the 3rd embodiment, and at this moment, the chuck of power tool is in auto state.

Figure 14 is the stereogram of the utility model power tool the 3rd embodiment middle sleeve.

Figure 15 is the stereogram of fastening sleeve among the utility model power tool the 3rd embodiment.

Figure 16 is the stereogram of the utility model power tool the 3rd embodiment bottom bracket axle.

Wherein:

1, chuck 2, the second sleeves 3, centerbody 4, jaw

5, nut 6, front portion 7, rear portion 8, axial hole

9, screwed hole 10, ledge 11, pad 12, groove

13, regulating element 14, stage clip 15, casing 16, baffle plate

17, jaw root 18, clutch 19, clutch 21, baffle ring

20, driving shaft 22, passage 23, engaging piece 24, threaded portion

25, thrust ring 26, resettlement section 27, bearing washer 28, bearing cage

29, ball 30, jaw guide groove 31, front end face 32, projection

33, groove 34, ball 35, internal thread 36, host cavity

37, upper surface 40, fastening sleeve 42, ledge 43, locating part

44, ledge 45, the axle collar 46, groove 47, projection

49, the first projectioies, 50, the second projectioies 51, end 52, end

55, axle sleeve 56, groove 58, ledge 59, lower surface

60, upper surface 61, ledge 62, end tooth 63, support portion

64, end 70, the first sleeves 73, groove 74, ledge

76, flexible member 80, outer ring 801, center line 81, front end face

82, projection 83, end tooth 84, flexible member 85 moves radially part

86, inner ring 87, the first fields of conjugate action 88, the second fields of conjugate action 89, blind hole

90, axle sleeve 91, upper surface 92, end tooth 93, groove

94, end 95, flexible member 96, groove 100, sliding sleeve

101,103, the second inclined-planes 104, helical teeth 102, the first inclined-planes, keyway

105, end face 106, end face 107, accepting groove 110, flexible member

115, limiting gasket 120, lock tube 121, groove 122, end tooth

124, the second inclined-planes 125,123, the first inclined-planes, lock collar 126, flexible member

130, pressing plate 131, groove 132, groove 134, end face

140, setting element 141, opening 142, key 143, ledge

144, clasp 145, end 150, regulating element 151, groove

152, end 153, screw thread 154, groove 155, spring base

156, screw thread 157, ledge 160, flexible member 165, packing ring

166, pressing element 170, internal gear 171, end face 172, end tooth

174, the second inclined-planes 175,173, the first inclined-planes, tooth 180, planetary gear

181, external tooth 185, planet carrier 190, motor output shaft 191, planetary gear

192, planet carrier 200, sleeve 201, groove 202, the first ledges

203, the second ledges 205, flexible member 206, locating part 210, fastening sleeve

211, end face 212, end face 213, the first projectioies 214, the second projectioies

230, axle sleeve 231, groove 232, mounting hole 233, bracing frame

234, groove 235, end face 236, end face 237, projection

238, lower surface 240, flexible member 250, regulating element

The specific embodiment

The utility model is preferred embodiment with the electric drill.Electrodill has casing 15, is arranged on the driving shaft 20 in the casing, is installed in the chuck 1 on the driving shaft 20.

Referring to figs. 1 through shown in Figure 5, in the utility model first preferred embodiment, chuck 1 has second sleeve 2, centerbody 3, jaw 4 and nut 5.Centerbody 3 is a centerbody, has front portion 6 and rear portion 7.Forwardly be formed with axial hole 8 in 6, the diameter of axial hole 8 is bigger than the maximum gauge of chuck 1 clamping tools shank.Be formed with the screwed hole 9 of standard-sized column in rear portion 7, the driving shaft 20 of the column on screwed hole 9 and the electric drill cooperates.Screwed hole 9 also can be standard-sized bellmouth, is used for cooperating with the driving shaft 20 of taper.

On centerbody 3, be formed be 22,3 passages 22 of 3 passages that hexagonal angle is provided with each other center line respectively with the angled setting of the axis of chuck 1, and intersect on the axis of chuck 1 a bit, this point is positioned at the front end of chuck 1.3 jaws 4 are housed in respectively in 3 passages 22 movably.Each jaw 4 all has engaging piece 23 and the threaded portion 24 that is parallel to chuck 1 axis, and threaded portion 24 is arranged on the offside of engaging piece 23.

Fixedly connected finite place piece 43 on the rear portion 9, when chuck 1 was opened fully, the rearward end butt of locating part 43 and jaw 4 prevented to retreat because of jaw 4 transition screw thread 24 interlocks of the root 17 that causes jaw 4 and nut 5.

Centerbody 3 comprises thrust ring 25, and is preferred, and thrust ring 25 is one-body molded with centerbody 3.Thrust ring 25 also can be for being fixedly mounted on the independent part on the centerbody 3.Be formed with the resettlement section 26 that is used to accommodate bearing assembly as described below on the thrust ring 25.Thrust ring 25 comprises that a plurality of jaw guide grooves 30 around its circumference setting are used to accommodate jaw 4.

Be provided with the groove 33 of annular on centerbody 3 near thrust ring 25 places, nut 5 is arranged in the groove 33.The bearing cage 28 of bearing washer 27 and annular is housed between thrust ring 25 and the nut 5.Bearing cage 28 is supported with a plurality of balls 29.Ball 29 is used for cooperating with the upper surface 37 of nut 5.

Because anterior 6 diameter is bigger, nut 5 is set to have the internal thread 35 that cooperates with the screw thread 24 of jaw 4 along two parts of diameter separation.When nut 5 rotated with respect to centerbody 3, jaw 4 can be pushed into or retract.The end that nut 5 deviates from upper surface 37 forms the front end face 31 of annular, and formation host cavity 36 between front end face 31 and the projection 32 that takes shape in the annular on the centerbody 3 contains a plurality of balls 34 in the host cavity 36.

After nut 5 was assembled on the centerbody 3, fastening sleeve 40 was tightened to one with two parts of nut 5.The axle collar 45 press fit on the fastening sleeve 40, fastening sleeve 40 adjoins on the inwall of lower surface 41, extend inward out ledge 44, ledge 44 is provided with a plurality of grooves 46, the axle collar 45 inwalls are provided with ledge 42, extend inward out a plurality of protrudingly 47 on the ledge 42, projection 47 is meshed with groove 46, and ledge 44 meshes with ledge 42.

The axle collar 45 adjoins on the outer wall of two ends 51,52, respectively extends outward a plurality of first projection, 49, the second projectioies 50, and quantity, the shape of projection 49,50 are identical, and is preferred, and projection 49,50 is 3.First projection 49 is used for and groove 56 engagement that takes shape on axle sleeve 55 inwalls, second projection 50 be used for take shape in first sleeve, 70 inwalls on groove 73 be meshed.

Extend the stepped ledge 58 of annular on the inwall of axle sleeve 55, referring to shown in Figure 1, the lower surface 59 of ledge 58 cooperates with the upper surface of bearing washer 27.

To shown in Figure 5, axle sleeve 55 adjoins on the inwall of upper surface 60 referring to Fig. 1, extends inward out the ledge 61 of annular, forms the support portion 63 of a plurality of axially extended end teeth 62 and annular on the ledge 61.

The ledge 10 of second sleeve 2 by annular cooperates with the groove 12 of annular on being molded over centerbody 3, thereby is arranged on rotationally on the centerbody 3, and the pads 11 that are set in the groove 12 that move axially of second sleeve 2 limit.

First sleeve 70 is sheathed on the axle sleeve 55 rotationally, and first sleeve 70 has front portion and rear portion, and the front portion is sheathed in second sleeve.First sleeve 70 forms baffle ring 74, forms groove 73 on the baffle ring 74.

Stage clip 14 is arranged between first sleeve 70 and second sleeve 2.The outer circumference surface of the rear portion of first sleeve 70 and second sleeve 2 is provided with annular knurl, and perhaps the burr of longitudinal extension perhaps is provided with the shape that other any operators of being suitable for grip safely.Second sleeve 2 and first sleeve 70 can be made up of plastic products, such as Merlon, and polypropylene etc.

To shown in Figure 5, clutch 18 is arranged on the casing 15 referring to Fig. 1, and clutch 18 comprises inner ring 86, outer ring 80, flexible member 84 and moves radially part 85.

Inner ring 86 is fixedly mounted on the casing 15 by screw, and inner ring 86 is set on the driving shaft 20, and with driving shaft 20 matched in clearance.

Be set with ring baffle 16 on inner ring 86, outer ring 80 is arranged in the baffle plate 16, and the front end face of baffle plate 16 is provided with baffle ring 21, and baffle plate 16 is used to prevent that outer ring 80 from moving radially.The projection 82 that extends inward out annular on the inwall of front end face 81 is adjoined in outer ring 80, forms a plurality of axially extended end teeth 83 on the projection 82.Radially form a plurality of blind holes 89 on the inner ring 86, preferred, the quantity of blind hole 89 is 4, all contains flexible member 84 in each blind hole 89 and moves radially part 85.

Preferably, flexible member 84 is a spring, moves radially part 85 and is ball.Move radially part 85 and also can be roller.

Further referring to shown in Figure 5, outer ring 80 has the field of conjugate action 87,88, and first field of conjugate action 87 is α with the angle of outer ring center line 801, and second field of conjugate action 88 is β with the angle of outer ring center line 801, α＜β.

Preferably, α is 30 °, and β is 33 °.

Flexible member 76 is arranged between inner ring 86 and the support portion 63, and axle sleeve 55 directions of edge towards the front portion 6 of centerbody 3 are compressed.

Regulating element 13 is set on the clutch 18.

First sleeve 70 and axle sleeve 55 are made axially reciprocating with respect to centerbody 3.With reference to shown in Figure 1, at this moment, chuck 1 is in the normal state, and first projection 49 of the axle collar 45 meshes with the groove 56 of axle sleeve 55, the lower surface 59 of the stepped ledge 58 of axle sleeve 55 and bearing washer 27 engagements.First sleeve 70 can rotate with respect to axle sleeve 55, and second sleeve 2 can rotate with respect to centerbody 3.Rotate first sleeve 70 and second sleeve 2 and all can not drive nut 5 around centerbody 3 rotations.

With first sleeve 70 from position shown in Figure 1 along B to pushing away forward, overcome the elastic force of stage clip 14, mesh fully until the groove 73 of first sleeve 70 and second projection 50 of the axle collar 45, the groove 56 of axle sleeve 55 keeps engagement with first projection 49 of the axle collar 45, referring to shown in Figure 2, chuck 1 is in manual state, first sleeve 70 is in primary importance, at this moment, driving shaft 20 is driven the shaft lock (not shown) and pins and can not rotate, and the operator grips first sleeve 70 with hand, rotate first sleeve 70 and second sleeve 2, drive the axle sleeve 55 and the axle collar 45, nut 5 rotates around centerbody 3, and is closed or open chuck 1, thereby clamps or the releasing tool head.

When along C when rotating first sleeve 70, the rotation of first sleeve 70 drives nut 5 equidirectional rotations, the rotation of nut 5 drive jaw 4 along towards the direction of the front portion 6 of centerbody 3 at passage 22 intrinsic displacements, until the engaging piece 23 of jaw 4 with the tool shank engagement and clamp.Owing between the upper surface 37 of resettlement section 26 and nut 5, be provided with bearing bracket stand 28 and ball 29, nut 5 along C when rotating, the upper surface 37 of nut 5 cooperates with ball 29, nut 5 just rotates on ball 34, the loss of frictional force is reduced to minimum, and most driving torque is converted into clamping force and is applied on the tool shank.

On the other hand, if between the upper surface 37 of resettlement section 26 and nut 5, ball 28 is not set, resettlement section 26 direct and upper surface 37 engagements, when nut 5 rotates, frictional force between nut 5 and the centerbody 3 can be very big, when the engaging piece 23 of jaw 4 during with the tool shank engagement, continue again along C to rotating nut 5, the upper surface 37 of nut 5 just is interlocked with resettlement section 26.When needs back off tool shank, need be along D to rotating nut 5, at this moment, the upper surface 37 of nut 5 just is interlocked with resettlement section 26, and rotational sleeve 70 is effort quite, even at all can't rotational sleeve 70.

And owing between the upper surface 37 of resettlement section 26 and nut 5, be provided with ball 28, when the engaging piece 23 of jaw 4 meshes with tool shank, continue again along C to rotating nut 5, nut 5 not can with steel ball 28 interlocks, rotational sleeve 70 gently, nut 5 is easy to along D to rotation, thus the back off tool shank.

When along D when rotating first sleeve 70, the rotation of first sleeve 70 drives nut 5 equidirectional rotations, the rotation of nut 5 drive jaw 4 along the direction of the front portion 6 that deviates from centerbody 3 at passage 22 intrinsic displacements, until the rear end and locating part 43 butts of jaw 4, chuck 1 is just opened fully.Locating part 43 can prevent screw thread 35 interlocks of root 17 with the nut 5 of jaw 4.

When with first sleeve 70 by position shown in Figure 1 along A to pusher, groove 73 until first sleeve 70 meshes with second projection, 50 disengagings of the axle collar 45, the upper surface of the baffle ring 74 of first sleeve 70 and 64 engagements of the end of axle sleeve 55, continue to promote first sleeve 70, the elastic force that drive axle sleeve 55 overcomes flexible member 76 moves backward, mesh until the end tooth 62 of axle sleeve 55 and the end tooth 83 of clutch 18, the groove 56 of axle sleeve 55 still keeps engagement with first projection 49 of the axle collar 45.

The baffle ring 74 of first sleeve 70 is between first projection 49 and 50 of axle sleeve 55, and first sleeve 70 can rotate with respect to axle sleeve 55, and referring to shown in Figure 3, at this moment, chuck 1 is in auto state, and first sleeve 70 is in the second place.

Referring to Fig. 3, shown in Figure 4, axle sleeve 55 is combined as a whole with the outer ring 80 of clutch 18, because the flexible member 84 that is arranged in the inner ring 86 will move radially the field of conjugate action 87 that part 85 is pressed on outer ring 80, on 88, outer ring 80 just becomes one with inner ring 86, and inner ring 86 is fixedly installed in the housing 1, thereby, axle sleeve 55 is just fixing with respect to housing 1, at this moment, starts electric drill, the rotation of driving shaft 20 drives centerbody 3 and rotates with respect to nut 5, thereby opens or closed chuck 1.Under this state, the operator only need grip electric drill on the other hand, and another hand is used for gripping the tool heads that needs are clamped or discharge.

When driving shaft 20 drives centerbodies 3 along F during to rotation, jaw 4 rotates with respect to nut 5, and along towards the direction of the front portion 6 of centerbody 3 at passage 22 intrinsic displacements, until the field of conjugate action 23 and the tool shank engagement of jaw 4, chuck 1 just clamps tool heads.At this moment, can not produce mutual motion between jaw 4 and the nut 5, centerbody 3 just is combined into one with jaw 4, nut 5 and fastening sleeve 40, the axle collar 45, axle sleeve 55, driving shaft 20 rotation and the torsion that is delivered to the outer ring 80 of clutch 18 has overcome the elastic force that is arranged on the flexible member 84 in the inner ring 86, moving radially part 85 just climbs on second field of conjugate action 88, clutch outer ring 80 just begins to skid, thereby prevents excessive closed chuck 1, has also prevented motor (not shown) stall.The effect of ball 28 is identical with manual state, repeats no more herein.

When driving shaft 20 drive centerbodies 3 along E when rotating, jaw 4 along towards the direction of locating part 43 at passage 22 intrinsic displacements, when jaw 4 retreats to afterbody and locating part 43 engagements, can not produce mutual motion between jaw 4 and the nut, centerbody 3 just with jaw 4, nut 5 and fastening sleeve 40, the axle collar 45, axle sleeve 55 is combined into one, at this moment, driving shaft 20 rotation and the torsion that is delivered to the outer ring 80 of clutch 18 has overcome the elastic force that is arranged on the flexible member 84 in the inner ring 86, moving radially part 85 just climbs on first field of conjugate action 88, clutch outer ring 80 just begins to skid, thereby prevent from excessively to open chuck 1, also prevented motor (not shown) stall.

Owing to be provided with ball 34 in centerbody projection 32 and 31 of nut front end faces, behind the afterbody and locating part 43 engagements of jaw 4, locating part 43 contacts with ball 34 by the front end face 31 that jaw 4 is compressed to nut 5 forward nut 5, be rolling friction between centerbody 3 and the nut 5, centerbody 3 continues along E to rotation again, centerbody projection 32 not can with nut 5 interlocks.Afterwards, centerbody 3 again along F to rotation and closed chuck 1 can be very laborsaving, chuck 1 can be by quick-make.

Because the angle α of first field of conjugate action 87 and outer ring center line 801 is less than the angle β of second field of conjugate action 88 with outer ring center line 801, move radially part 85 power that the power that consumed climbs and consumed on second field of conjugate action 88 greater than steel ball 86 of on first field of conjugate action 87, climbing, thereby discharge the used torsion of chuck 1 greater than the used torsion of locking chuck 1.

Extremely shown in Figure 10 referring to Fig. 6, in the utility model second preferred embodiment, extend two end teeth 92 along the upper surface 91 of axle sleeve 90, axle sleeve 90 is near the groove 93 that forms annular on the inwalls of upper surface 91, described in embodiment one, first sleeve 70 is set on the axle sleeve 90.Form locating surface 38 and symmetrically arranged two keys 39 on the rear portion 7 of centerbody 3.

In the present embodiment, the structure identical with embodiment one do not done and given unnecessary details.

Sliding sleeve 100 is set on the rear portion 7 of centerbody 3, forms symmetrically arranged two keyways 104 on the inwall of sliding sleeve 100, and after the assembling, keyway 104 connects with key 39, and sliding sleeve 100 just can endwisely slip with respect to centerbody 3.

To shown in Figure 9, extend symmetrically arranged two helical teeth 101 (only showing among the figure) referring to Fig. 6 on the end face 106 of sliding sleeve 100, helical teeth 101 has first inclined-plane 102,103.Form the accepting groove 107 of annular on the sliding sleeve 100.

Limiting gasket 115 is fixedly mounted between the shoulder 16 and key 39 of output shaft 20.Flexible member 110 is arranged between accepting groove 107 and the limiting gasket 115, and flexible member 110 directions of edge towards the front portion 6 of centerbody 3 compress, and make the end face 105 of sliding sleeve 100 connect with locating surface 38.

After the assembling, sliding sleeve 100 is positioned at axle sleeve 90.

To shown in Figure 10, lock tube 120 is set on the output shaft 20 referring to Fig. 6.Lock tube 120 has the lock collar 125 of annular, and an end face upper edge of lock collar 125 extends axially out 4 end teeth 122, and end tooth 122 is along the diameter symmetry setting of lock collar 125.The groove 121 of symmetrically arranged 2 annulars of lock collar 125 upper edge diametric(al)s, groove 121 has first inclined-plane 123 and second inclined-plane 124.

The pressing plate 130 of annular is fixedly installed on the casing 15, forms two grooves 131 that are provided with along diameter symmetry on the end face 134 of pressing plate 130.Form 4 along the circumferential direction uniform grooves 132 on the inwall of pressing plate 130, groove 132 be used for sliding sleeve 120 on end tooth 122 connect.

Referring to shown in Figure 6, pressing plate 130 is provided with the groove 134 of annular.Flexible member 95 is arranged between the groove 134 and the groove 93 on the axle sleeve 90 of pressing plate 130, and flexible member 126 is arranged between pressing plate 130 and the lock tube 120 and with lock tube 120 and is resisted against on the limiting gasket 115.Lock tube 120 fixedly installs with respect to casing 15.

Referring to shown in Figure 8, form 3 grooves 151 on the end 152 of regulating element 150, form a plurality of grooves 154 on the inwall of the close end 152 of regulating element 150.Form screw thread 153 on the inwall, screw thread 153 be used for spring base 155 on screw thread 156 engagement.

Extend outward 3 keys 142 on the excircle of the setting element 140 of annular, setting element 140 along the circumferential direction forms two fasteners 144.Setting element 140 adjoins the ledge 143 that extends internally out on the inwall of end 145, is symmetrically arranged with two openings 141 on the ledge 143, and is preferred, opening 141 length along the circumferential direction and the equal in length of the groove 131 on the pressing plate 130.Opening 141 length along the circumferential direction also can be longer than the length of the groove on the pressing plate 130 131.

Further referring to shown in Figure 6, in the off working state of chuck 1, key 142 meshes with groove 151, and fastener 144 is resisted against on the groove 154, and setting element 140 is set on the pressing plate 130, and ledge 143 blocks groove 131.

To shown in Figure 8, clutch 19 comprises internal gear 170, pressing element 166, packing ring 165 and flexible member 160 referring to Fig. 6.

Internal gear 170 is set on the planetary gear 180, in axial direction extends a plurality of end teeth 172 on the end face 171 of internal gear 170, and end tooth 172 has first inclined-plane 173,174.Form axially extended tooth 175 on the inwall of internal gear 170, tooth 175 is used for axially extended external tooth 181 engagements with planetary gear 180.

Be provided with pressing element 166 and packing ring 165 in the housing 15, pressing element 166 is arranged between the end face 171 of packing ring 165 and internal gear 170, and flexible member 160 is arranged on packing ring 165 and is molded between the ledge 157 of spring base 155.Flexible member 160 is resisted against pressing element 166 on the end face 171 of internal gear 170.

Preferably, pressing element 166 is a rolling element, such as roller, and ball etc.

Preferably, flexible member 160 is a spring.

Referring to shown in Figure 10, first inclined-plane 173 of internal gear 170 is α ' with the angle of the axis X of internal gear 170, and second inclined-plane 174 of internal gear 170 is β ' with the angle of the axis X of internal gear 170, α ' β '.Preferably, α ' is 47 °, and β ' is 50 °.

When this programme chuck 1 was in manual state and first sleeve 70 and is in primary importance, the mode of open and close chuck 1 was identical with the mode of embodiment one, repeats no more herein.

Referring to shown in Figure 6, at this moment, chuck 1 is in off working state, and first sleeve 70 can rotate with respect to axle sleeve 90, and second sleeve 2 can rotate with respect to centerbody 3.Rotate first sleeve 70 and second sleeve 2 and all can not drive nut 5 around centerbody 3 rotations.

Rotate regulating element 150, drive setting element 140 rotations, when regulating element 150 forwarded the 23rd gear to, the opening 141 on the ledge 143 alignd with groove 131 on the pressing plate 130.At this moment, with first sleeve 70 along position axis shown in Figure 6 to pusher, groove 73 until first sleeve 70 meshes with second projection, 50 disengagings of the axle collar 45, the upper surface of the baffle ring 74 of first sleeve 70 and 94 engagements of the end of axle sleeve 90, continue to promote first sleeve 70, the elastic force that drive axle sleeve 90 overcomes flexible member 95 moves backward, mesh until the end tooth 92 of axle sleeve 90 and the groove 131 of pressing plate 130, the groove 96 of axle sleeve 90 remains engagement with first projection 49 of the axle collar 45, the baffle ring 74 of first sleeve 70 is between first projection, 49 and second projection 50 of the axle collar 45, first sleeve 70 can rotate with respect to axle sleeve 90, referring to shown in Figure 7, at this moment, chuck 1 is in auto state, and first sleeve 70 is in the second place.

The end tooth 92 of axle sleeve 90 meshes together with the groove 131 of pressing plate 130, and axle sleeve 90 just is combined as a whole with pressing plate 130, because pressing plate 130 is fixed in the housing 19, axle sleeve 90 is just fixing with respect to housing 19.At this moment, start electric drill, the rotation of motor output shaft 190 drives planetary gear 191,180 and planet carrier 185 rotations, because planet carrier 185 is fixed on the driving shaft 20, driving shaft 20 just is driven to rotate, and drives centerbody 3 and rotates with respect to nut 5, thereby open or closed chuck 1.Under this state, the operator only need grip electric drill on the other hand, and another hand is used for gripping the tool heads that needs are clamped or discharge.

Referring to shown in Figure 7, when driving shaft 20 when the J direction is rotated, jaw 4 rotates with respect to nut 5, and along the direction of the front portion 6 that deviates from centerbody 3 at passage 22 intrinsic displacements, until the end face 105 of the afterbody of jaw 4 and sliding sleeve 100 against.Because sliding sleeve 100 is to be connected anti-rotation by key to link together with centerbody 3, thereby the rotation of centerbody 3 drives sliding sleeve 100 equidirectional rotations, when jaw 4 continued to continue displacement along the direction of the front portion 6 that deviates from centerbody 3, jaw 4 promoted the equidirectional displacement of elastic force that sliding sleeves 100 overcome flexible member 110.

Extremely shown in Figure 9 referring to Fig. 7, when first inclined-plane 102 of the helical teeth 101 of sliding sleeve 100 touches first inclined-plane 123 of groove 121 of lock tube 120, groove 121 is just drawn in helical teeth 101 in first inclined-plane 123, and sliding sleeve 100 just in axial direction is pulled away from the afterbody of jaw 4 by lock tube 120.At this moment, the afterbody of jaw 4 and lock tube 120 break away from engagement.Centerbody 3 is combined as a whole with sliding sleeve 100 and casing 15, because centerbody 3 is fixed together with driving shaft 20, thereby driving shaft 20 is just by locking, the projection 32 of centerbody 3 just not can with front end face 31 interlocks of nut 5.

At this moment, thereby, motor output shaft 190 drives planet carrier 192 rotations because still driving planetary gear 191 rotations, the rotation of planet carrier 192 drives planetary gear 180 and rotates, the rotating drive internal gear 170 of planetary gear 180 rotates, just climbing on the end tooth 172 of internal gear 170 of pressing element 166, nut 5 just can be by not overtighten, thereby prevented from excessively to open chuck 1, prevented motor (not shown) stall yet.

When driving shaft 20 when the K direction is rotated, jaw 4 rotates with respect to nut 5, and along towards the direction of the front portion 6 of centerbody 3 at passage 22 intrinsic displacements, until the field of conjugate action 23 and the tool shank engagement of jaw 4, chuck 1 just clamps tool heads.At this moment, can not produce mutual motion between jaw 4 and the nut 5, driving shaft 20 is by locking, and thereby motor output shaft 190 still drives 192 rotations of planetary gear 191 rotation driving planet carriers, and the rotation of planet carrier 192 drives planetary gear 180 and rotates, and the rotating drive internal gear 170 of planetary gear 180 rotates, just climbing on the end tooth 172 of internal gear 170 of pressing element 166, nut 5 just can be by not overtighten, thereby prevented excessive closed chuck 1, prevented motor (not shown) stall yet.

Identical among ball 28 roles and the embodiment one do not done herein and given unnecessary details.

When driving shaft 20 when the K direction is rotated, second inclined-plane 124 of groove 121 just promotes second inclined-plane 103 of helical teeth 101, and helical teeth 101 just breaks away from groove 121, afterwards under the elastic force of flexible member 110, sliding sleeve 100 is just along the moving axially of centerbody 3, until end face 105 and locating surface 38 engagements.

Pressing element 166 was climbed on first inclined-plane 173 after chuck 1 reached the fully open position, and chuck 1 reaches complete closed back pressing element 166 and climbs on second inclined-plane 174.Because the angle α ' of the axis X of first inclined-plane 173 and internal gear 170, less than the angle β ' of second inclined-plane 174 with axis X, the power that pressing element 166 is climbed and consumed on first inclined-plane 173, the power of on second inclined-plane 174, climbing and being consumed greater than pressing element 166, thereby discharge the torsion of chuck 1 torsion greater than locking chuck 1.

To shown in Figure 16, in the utility model the 3rd preferred embodiment, chuck 1 is single collet, promptly only has a sleeve 200 referring to Figure 11.Below only the difference of this preferred embodiment with preferred embodiment one is described.The label of the part identical with first preferred embodiment is identical in the present embodiment, repeats no more herein.

The inwall of sleeve 200 is provided with first ledge 202 and second ledge 203.

Flexible member 205 is located between first ledge 202 and the locating part 206.Locating part 206 is fixed on the front portion 6 of centerbody 3.

Second ledge 203 is provided with groove 201.Fastening sleeve 210 is tightened to one with two parts of nut 5.Fastening sleeve 210 adjoins on the outer wall of two ends 211,212, and the quantity, the shape that respectively extend outward a plurality of first projection, 213,214, first projectioies 213,214 are identical, and preferred, first projection 213,214 is 3.First projection 213 is used for and groove 231 engagements that are molded on axle sleeve 230 inwalls, and second projection 214 is used for and groove 201 engagements that take shape on sleeve 200 inwalls.

Extend the projection 237 of annular on the inwall of axle sleeve 230, the lower surface 238 of projection 237 cooperates with the upper surface of bearing washer 27.

Axle sleeve 230 adjoins on the inwall of upper surface 232, extend bracing frame 233, form 3 mounting holes 232 between the inwall of bracing frame 233 and axle sleeve 230, form the groove 234 of annular on the bracing frame 233, flexible member 240 is arranged between groove 234 and the inner ring 86.

Sleeve 200 and axle sleeve 230 are made axially reciprocating with respect to centerbody 3.With reference to Figure 11, Figure 14, Figure 15 and shown in Figure 16, at this moment, chuck 1 is in the normal state.First projection 213 of fastening sleeve 210 meshes with the groove 231 of axle sleeve 230, the lower surface 238 of projection 237 and bearing washer 27 engagements.Sleeve 200 can rotate with respect to axle sleeve 230.Rotational sleeve 200 can not drive nut 5 and rotate around centerbody 3.During electric drill work, the operator can grip sleeve 200, and sleeve 200 plays the effect of auxiliary guiding.

With sleeve 200 by position shown in Figure 11 along N to pushing away forward, overcome the elastic force of flexible member 205, mesh fully until the groove 201 of sleeve and second projection 214 of fastening sleeve 210, the groove 231 of axle sleeve 230 keeps engagement with the projection of fastening sleeve 210 223, referring to shown in Figure 12, chuck 1 is in manual state, sleeve 200 is in primary importance, at this moment, driving shaft 20 is driven the shaft lock (not shown) and pins and can not rotate, and the operator drives fastening sleeve 210 and nut 5 and rotates around centerbody 3 with hand rotational sleeve 200, closed or open chuck 1, thus clamp or the releasing tool head.

When with sleeve 200 by position shown in Figure 11 along M to pusher, groove 201 until sleeve 200 meshes with second projection, 214 disengagings of fastening sleeve 210, the upper surface of second ledge 203 of sleeve and 236 engagements of the end of axle sleeve 230, continue to promote sleeve 200, the elastic force that drive axle sleeve 230 overcomes flexible member 240 moves backward, mesh until the mounting hole 232 of axle sleeve 230 and the end tooth 83 of clutch 18, the groove 231 of axle sleeve 230 still keeps engagement with first projection 213 of fastening sleeve 210, at this moment, second ledge 203 of sleeve 200 is between first projection, 213 and second projection 214, sleeve 200 can rotate with respect to axle sleeve 230, referring to shown in Figure 13, at this moment, chuck 1 is in auto state, and sleeve 200 is in the second place.

Referring to shown in Figure 13, axle sleeve 230 is combined as a whole with the outer ring 80 of clutch 18, to move radially in the field of conjugate action 87,88 that part 85 is pressed on outer ring 80 owing to be arranged on flexible members 84 in the inner ring 86, outer ring 80 just becomes one with inner ring 86, inner ring 86 is fixedly installed on the casing 15, thereby axle sleeve 230 is just fixing with respect to casing 15, at this moment, starts electric drill, the rotation of driving shaft 20 drives centerbody 3 and rotates with respect to nut 5, thereby opens or closed chuck 1.Under this state, the operator only need grip electric drill on the other hand, and another hand is used for gripping the tool heads that needs are clamped or discharge.

When the position that chuck 1 reaches complete closure or opens, driving shaft 20 rotation and the torsion that is delivered to outer ring 80 has overcome the elastic force that is arranged on the flexible member 84 in the inner ring 86, move radially just 80 the field of conjugate action 87 selectively of part 85 in the outer ring, climbing on 88, thereby prevented from excessively to open or closed chuck 1, also prevented motor (not shown) stall.

With embodiment one, discharge the torsion of the torsion of chuck 1 greater than locking chuck 1.

Those skilled in the art as can be known, second sleeve 70 and first sleeve 2 can replace to the single sleeve 200 that is disclosed in the preferred embodiment three in the preferred embodiment two.

Claims (15)

1, a kind of power tool, comprise casing (15), be arranged on the driving shaft (20) in the casing (15), be connected the chuck (1) on the driving shaft (20), described chuck (1) comprises the centerbody (3) of have head (6) and afterbody (7), described afterbody (7) is provided be used for driving shaft (20) thus cooperate make centerbody (3) and then driving shaft (20) rotate, described head (6) comprises axial hole (8) and some angled settings and the passage (22) that intersects with described axial hole (8), some jaws (4) slidably are positioned at each passage (22), each jaw (4) comprises pawl face (23) and is formed at the screw thread (24) of opposite side, nut (5) by with jaw (4) on screw thread (24) cooperate rotatable being installed on the described centerbody (3), move axially in passage (22) thereby make the rotation of nut (5) drive jaw (4); The axially movable axle sleeve (230) that is set on the nut (5), it is characterized in that: described chuck (1) only has a sleeve (200), described sleeve (200) is axially back and forth between the primary importance and the second place, sleeve (200) is under primary importance, nut (5) can rotate with respect to casing (15), sleeve (200) is under the second place, and nut (5) can not rotate with respect to casing (15).

2, power tool according to claim 1 is characterized in that: what described sleeve (200) was axially movable is set on the axle sleeve (230).

3, power tool according to claim 1 is characterized in that: described chuck (1) also comprises the fastening sleeve (210) of close-fitting on nut (5), and described axle sleeve (230) axially movably is set on the described fastening sleeve (210).

4, power tool according to claim 3, it is characterized in that: described fastening sleeve (210) adjoins two end faces (211,212) first projection that respectively extends radially outwardly out on the outer wall (213) and second projection (214), be formed with axially extended groove (231) on the inwall of described axle sleeve (230), described first projection (213) connects with described axle sleeve groove (231).

5, power tool according to claim 1, it is characterized in that: fixedly install finite place piece (206) on the front portion (6) of described centerbody (3), described sleeve (200) is provided with first ledge (202) and second ledge (203), described first ledge (202) selectively connects with locating part (206), and described second ledge (203) selectively connects with the end (236) of axle sleeve (230).

6, power tool according to claim 5 is characterized in that: flexible member (205) is arranged between first ledge (202) and the locating part (206).

7, power tool according to claim 1, it is characterized in that: described nut (5) has front end face (31), described centerbody (3) is provided with annular protrusion (32), is provided with ball (34) between the front end face (31) of described nut (5) and the annular protrusion (32).

8, according to any described power tool of claim 1 to 7, it is characterized in that: described power tool also comprises the clutch (18) that is arranged on the casing (1).

9, power tool according to claim 8 is characterized in that: described clutch (18) comprises that at least one moves radially part (85).

10, power tool according to claim 8 is characterized in that: the described part (85) that moves radially is ball or roller.

11, power tool according to claim 8, it is characterized in that: described clutch (18) also comprises inner ring (86), outer ring (80) and flexible member (84), described inner ring (86) is fixed on the casing (15), flexible member (84) radially variable shape the described part (85) that moves radially connects with described outer ring (80), to be arranged to move radially between part (85) and the inner ring (86).

12, power tool according to claim 11 is characterized in that: described flexible member (84) is a spring.

13, power tool according to claim 11, it is characterized in that: described outer ring (80) have first field of conjugate action (87) and second field of conjugate action (88), describedly move radially selectable and described first field of conjugate action of part (85) (87) and second field of conjugate action (88) connects.

14, power tool according to claim 11 is characterized in that: described power tool also has the baffle plate (16) that fixedly installs with respect to casing (15), and described outer ring (80) are arranged in the described baffle plate (16).

15, power tool according to claim 11, it is characterized in that: described outer ring (80) are provided with axially extended end tooth (83), described axle sleeve (230) is provided with mounting hole (232), and mounting hole (232) selectively meshes with outer ring end tooth (83).

Images