CN2934776Y

CN2934776Y - Variable-speed tool

Info

Publication number: CN2934776Y
Application number: CN 200620130752
Authority: CN
Inventors: 陈成忠
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2006-07-28
Filing date: 2006-07-28
Publication date: 2007-08-15
Anticipated expiration: 2016-07-28

Abstract

The utility model discloses a shift tool, comprising a switch, a gear case machine shell, a motor, an output shaft, a multilevel transmission gear cluster matched with a motor and the output shaft and a speed regulation ring with an internal tooth. A speed regulating shifting fork matched with the speed regulation ring and a tension spring positioned between the gear box machine shell and the speed regulation shifting fork are provided with a torque control ring with a runner. A joint of the speed regulation shifting fork being positioned movably in the runner, when a output shaft load reaches a index value, the torque control ring circumrotates to make the speed regulation shifting fork do axial movement in the runner under the action of the tension spring and consequently, the speed regulation ring is driven to do axial movement. The shift tool of the utility model can realize the automatic adjustment of a rotate speed and the torque according to the load torque change.

Description

Speed change tool

Technical field

The utility model relates to a kind of speed change tool, and especially a kind of instrument of the exportable different rotating speeds of band multi-change speed driving mechanism that is driven by electric motor, pneumatic motor or fluid motor is as electric drill, screwdriver set and hammer drill etc.

Background technique

A kind of speed change tool, as electric drill, screwdriver set and hammer drill etc., having the multi-change speed driving mechanism can change the different rotating speed of output according to load torque.The multipole variable transmission mechanism of speed change tool all comprises multistage drive gear mechanism and the arrangements for speed regulation that connect motor and output shaft usually, thereby this arrangements for speed regulation axial motion change is exported different speed with the meshing relation change velocity ratio between the multistage drive gear mechanism.In the prior art, the adjusting of arrangements for speed regulation normally manual operation is finished, announce No. 6655470 as U. S. Patent and disclosed a kind of manual governing device, but the speed ring of these arrangements for speed regulation by link be arranged on casing on the operation piece of axial motion be connected; The operator promotes operation piece and moves axially and then drive speed ring and move axially, make speed ring selectively first ring gear in the multistage drive gear mechanism or second ring gear and casing locking or speed ring be made its synchronous rotation with first and second ring gear engagement simultaneously, thereby realize the output of three kinds of different rotating speeds and moment of torsion.But this manual operation makes the operator have to constantly to pay close attention to working state, the load variations situation of instrument and judges that what regulates arrangements for speed regulation constantly.This manual operation requires height to operator's operative skill, and is unfavorable for raising the efficiency.

The model utility content

Technical problem to be solved in the utility model: a kind of speed change tool is provided, and the arrangements for speed regulation of this instrument can change rotating speed and the output torque of adjusting working head automatically according to load torque.

Another technical problem to be solved in the utility model: a kind of speed change tool is provided, and this instrument can stable operation in output working state at a high speed.

Another technical problem to be solved in the utility model: a kind of speed change tool is provided, and this instrument can stable operation in the working state of output low speed.

The technical solution of the utility model is: a kind of speed change tool, comprise switch, the gear-box casing, motor, output shaft, the multistage drive gear mechanism and the speed ring that connect with described motor and described output shaft, described multistage drive gear mechanism comprises the moment of torsion control ring, it is characterized in that: described speed change tool also comprises the speed governing shift fork that connects with described speed ring and along first elastic element of the described speed governing shift fork of axial driving of described speed ring, be provided with second elastic element between described moment of torsion control ring and the described casing, described moment of torsion control ring and described speed governing shift fork the two one of them are provided with chute, another is provided with the joint that is housed in movably in the described chute, when the output shaft load reaches predetermined value, described moment of torsion control ring overcomes the rotation of the second elastic element elastic force, make described speed governing shift fork under the driving of described first elastic element, axially move, move in the primary importance and the second place thereby drive described speed ring.

The further technological scheme of the utility model is: described chute comprises at least one arcuation groove, an axial notch and an oblique groove that connects described arcuation groove and described axial notch, described arcuation groove, described axial notch and described oblique groove form continuous path.

The further technological scheme of the utility model is: described chute is arranged on the described moment of torsion control ring excircle, described chute comprises two axial ends and two side direction end faces, described axial end middle part is to projecting inward, described bump comprises a top margin and dual-side, described chute two ends are respectively arranged with a pair of slide bar, described slide bar comprises the main body of rectangular triangle or right-angled trapezium, a straight flange of described main body can constitute the arcuation groove with another axial end of top margin and described chute of described bump, the side end face of another of described main body straight flange and described chute constitutes axial notch, and the hypotenuse of described main body and the side of described bump constitute oblique groove.

The further technological scheme of the utility model is: an end freedom of described slide bar, the other end rotatably is connected with the described first arcuation groove, described slide bar comprises the connecting end that is radially extended by described main body downwards, be provided with the 3rd elastic element between described connecting end and the described first arcuation groove, described slide bar makes that under described the 3rd elastic element effect the hypotenuse of described main body is resisted against on the side of described bump, and a straight flange of described main body and the top margin of described bump constitute the continuous end face of the described second arcuation groove.

The further technological scheme of the utility model is: rise gradually to an end that connects described arcuation groove from an end that connects described axial notch and make its end face be higher than the bottom surface of described arcuation groove in the bottom surface of described oblique groove, and the end face of a straight flange of described main body, described oblique groove constitutes the continuous end face of the described second arcuation groove with the top margin of described bump.

In addition, in the technical solution of the utility model: the front-end face of described moment of torsion control ring is provided with two first axial holes, the 3rd hole that described gear-box casing is provided with axial second hole and communicates with second hole, contain stage clip and positioning pluging rod in described second hole, described positioning pluging rod comprises the main body that axially extends back along second hole and passes the 3rd hole and stretch out leg outside the described gear-box casing that described leg is connected separatably with described switch.

First planetary gear set drove the characteristics of first ring gear rotation when arrangements for speed regulation of the utility model speed change tool made full use of the load torque increase, periphery at first ring gear is provided with chute, speed ring is connected with the speed governing shift fork that joint is arranged in the chute movably, the speed governing shift fork axially moves under the first elastic element tension, the speed ring axial motion changes and the meshing relation of multistage driving gear thereby drive, and has realized the rotating speed and the output torque of automatic adjustment working head.

Chute of the present utility model comprises at least one arcuation groove, an axial notch and an oblique groove that connects arcuation groove and axial notch, the joint of speed governing shift fork is housed in the chute and can be along by the arcuation groove, and axial notch moves with the continuous path of oblique groove formation.When the load torque variation does not reach predetermined value, the joint that the rotation of first ring gear is equivalent to the speed governing shift fork moves in the arcuation groove, because the continuous end face of the arcuation groove that slide bar and bump constitute or owing to slide bar, stopping of the continuous end face of the arcuation groove that the end face of oblique groove constitutes with bump, thereby the speed governing shift fork can not move axially the stable operation that has guaranteed speed ring instrument when primary importance, those skilled in the art are easy to be provided with by the radian that changes continuous end face the load torque excursion of speed ring stable operation of instrument when the primary importance, have also promptly changed the load predetermined value that the output different rotating speeds need reach.

The front-end face of first ring gear of the present utility model is provided with two axial first holes, and the 3rd hole that the gear-box casing is provided with axial second hole and communicates with second hole contains stage clip and positioning pluging rod in second hole, and positioning pluging rod is connected separatably with switch.When load torque surpasses predetermined value, when the relative speed governing shift fork of first ring gear rotates to the side direction end face, the speed governing shift fork is in the axial notch axial motion of the drive lower edge of first elastic element, and drive speed ring to the second place, when axial first hole of front-end face of first ring gear rotates to the aligned position in axial second hole of gear-box casing simultaneously, positioning pluging rod inserts under the effect of stage clip in axial first hole of first ring gear, thereby limited the rotation of first ring gear, and then guaranteed the stable operation of speed ring instrument when the second place.

Description of drawings

Below in conjunction with accompanying drawing is that preferred embodiment is described further the utility model with the electric drill.

Fig. 1 is the partial sectional view of the electric drill of the utility model first preferred embodiment, and wherein speed ring is positioned at primary importance.

Fig. 2 is the three-dimensional exploded view of the electric drill multi-change speed driving mechanism of the utility model first preferred embodiment.

Fig. 3 is the stereogram of the slide bar in the utility model first preferred embodiment.

Fig. 4 a is the isometric front view of the moment of torsion control ring in the utility model first preferred embodiment.

Fig. 4 b is the rear perspective view of the moment of torsion control ring in the utility model first preferred embodiment.

Fig. 5 is the partial sectional view of the electric drill of the utility model first preferred embodiment, and wherein speed ring is positioned at the second place.

Fig. 6 a be the load variations of the utility model first preferred embodiment when not reaching predetermined value the moment of torsion control ring overcome the elastic force rotation of second elastic element, the joint of speed governing shift fork is at the schematic representation of moment of torsion control ring arc groove motion.

Fig. 6 b is that the load variations of the utility model first preferred embodiment elastic force that the moment of torsion control ring overcomes second elastic element when reaching predetermined value is further rotated, and the joint of speed governing shift fork is made the schematic representation of axial advancement at the axial notch of the tension lower edge of first elastic element moment of torsion control ring.

Fig. 6 c is that the moment of torsion control ring of the utility model first preferred embodiment resets under the second elastic element effect, the schematic representation that the elastic force that the joint of speed governing shift fork overcomes first elastic element moves after axially along the oblique groove of moment of torsion control ring.

Fig. 7 is the partial schematic diagram of the electric drill multi-change speed drive part of the utility model second preferred embodiment.

Fig. 8 is the stereogram of the moment of torsion control ring in the utility model second preferred embodiment.

Fig. 9 is the stereogram of the moment of torsion control ring in the utility model the 3rd preferred embodiment.

Figure 10 is the part three-dimensional exploded view of the electric drill multi-change speed driving mechanism of the utility model the 3rd preferred embodiment.

Figure 11 is the stereogram of the moment of torsion control ring in the utility model the 4th preferred embodiment.Wherein:

20 electric drills, 22 motor shafts, 24 motors

25 supports, 26 switches, 27 external toothings

28 output shafts, 30 gear-box casings, 32 center holes

34 attachment holes, 35 projections, 36,36 ' supporting disk

38,38 ' groove, 40,40 ' the first gear-box casing, 42 first axial long holes

44 second axial long holes, 46 axial channel, 48 axial bores

50 holes, 52 curve baths, 54 arc legs

56 projections, 58 second gear-box casings, 60 multistage drive gear mechanisms

62 first planetary gear set, 64 second planetary gear set, 66 the third line star-wheel groups

68 first planet carriers, 70,70 ' second planet carrier, 72 the third line star framves

74 first ring gears, 76,76 ' second ring gear, 78 the 3rd ring gears

80,80a, 80b moment of torsion control ring, 81 second arc grooves, 82 annular body

83 side end faces, 84 arc legs, 86 curve baths

88 projections, 90 axial bores, 91 axial notches

92 projections, 93 oblique grooves, 94 through holes

95,95 ' ear end face, 96,96 ' chute, 97 arcuation grooves

98 front-end faces, 99 side direction end faces, 100 top margins

102 sides, 104 bumps, 106 first arc grooves

110 slide bars, 112 metal clipss, 114 main bodys

116 connecting ends, 118 grooves, 120,120 ' speed ring

122 circular grooves, 124,124 ' projection, 130 speed governing shift forks

132 main bodys, 134 through holes, 136 curve baths

138 protruding shins, 140 joints, 142,142 ' external toothing

144 supports, 146 first sun gears, 148 supports

150 second sun gears, 152 supports, 160C shape metal ring

162 legs, 164 extension springs, 165 stage clips

166 extension springs, 167 stage clips, 170 positioning pluging rods

172 main bodys, 174 legs, 180 stage clips

181 end faces

Embodiment

The utility model preferred embodiment is that example specifies variable transmission mechanism with electric drill 20, especially realizes the arrangements for speed regulation of speed ring axial motion.

Shown in 5, a kind of electric drill 20, the motor 24 that comprises charged arbor 22, with the startup of two supports 25/the stop switch 26 of motor, the output shaft 28 of band external toothing 27, gear-box casing 30, the multistage drive gear mechanism 60 that connects motor shaft 22 and output shaft 28, moment of torsion control ring 80 by multistage drive gear mechanism 60 rotary driving, with multistage drive gear mechanism 60 sockets can axially movable speed ring 120, speed governing shift fork 130, the C shape metal ring 160 that has three legs 162, be arranged on the extension spring 164 between gear-box casing 30 and the speed governing shift fork 130, be arranged on a pair of extension spring 166 between moment of torsion control ring 80 and the gear-box casing 30, positioning pluging rod 170 and the stage clip 180 that connects with positioning pluging rod 170, wherein positioning pluging rod 170 comprises columned main body 172 and two legs 174 that extended by main body 172 downwards.

Gear-box casing 30 comprises that band center hole 32, two attachment holes 34 and bottom are provided with the supporting disk 36 of radial projection 35; The first gear-box casing 40 of a plurality of circumferentially even distribution grooves 38 of inner surface belt; Also be provided with first axial long hole 42 that connects the inside and outside surface of casing, three second axial long holes 44 and axial channel 46 on the first gear-box casing 40; The rear end of the first gear-box casing 40 also is provided with the axial bore 48 of accommodating positioning pluging rod 170 and stage clip 180, the hole 50 that connects this axial bore 48 and casing outer surface, curve bath 52 and arc leg 54, and the leg 174 of positioning pluging rod 170 passes hole 50 and stretches out outside the first gear-box casing 40; And the second gear-box casing 58 of band radial projection 56.When connecting, arc leg 54 parts of the first gear-box casing 40 cover supporting disk 36 the external peripheral surface of projection 35 on and fixedly connected by bolt or known other modes of industry, the front-end face of the first gear-box casing 40 also can be fixedlyed connected by bolt or known other modes of industry with the ear end face of the second gear-box casing 58, the common cavity of accommodating multistage drive gear mechanism 60 that forms.

Multistage drive gear mechanism 60 comprises first and second and three

planet wheel groups

62,64 and 66; First and second and three

planet carriers

68,70 and 72; Be arranged on first ring gear 74 on moment of torsion control ring 80 inner peripheral surfaces; Be arranged on second ring gear 76 of speed ring 120 inner peripheral surfaces; The 3rd ring gear 78.

Moment of torsion control ring 80 comprises annular body 82, two slide bars 110 that connect with annular body 82 and metal clips 112, wherein slide bar 110 comprises the main body 114 of right-angled triangle or right-angled trapezium and near the connecting end 116 that radially extends of two right angle side settings and be arranged on groove 118 on the connecting end 116 downwards.The upper rear end of annular body 82 is provided with arc leg 84 and curve bath 86; Annular body 82 front end bottoms are provided with the projection 88 that extends radially outwardly, and wherein projection 88 is provided with two axial bores 90; Annular body 82 outer peripheral surfaces are provided with circular protrusion 92, and the chute 96 that has two through holes 94, and wherein front-end face 98 middle parts of chute 96 form the bump of being made up of a top margin 100 and dual-side 102 104 to projecting inward; First arc groove 106 that the inner peripheral surface of annular body 84 is provided with first ring gear 74 and is provided with corresponding to two through hole 94.The connecting end 116 of slide bar 110 passes in the through hole 94 that connects the chute 96 and first arc groove 106, and metal clips 112 is housed in first arc groove 106 match with groove 118 on the connecting end 116 (seeing Fig. 4 b).The hypotenuse of the main body after the connection (114) is resisted against on the side 102 of bump 104, the top margin 100 of its right angle side and bump 104 forms continuous front-end face, and constituted arcuation groove 97 with the ear end face 95 of chute 96 and (seen Fig. 4 a), another straight flange of main body 114 and the side end face of described chute 96 99 constitute axial notch 91, and the side 102 of the hypotenuse of main body 114 and bump 104 constitutes oblique groove 93.

The inner peripheral surface of speed ring 120 is provided with second ring gear 76, outer peripheral surface is provided with circular groove 122, front end at outer peripheral surface is provided with a plurality of circumferential equally distributed projections 124, and this projection 124 matches with a plurality of grooves 38 of the first gear-box casing, 40 internal surfaces separatably.

Speed governing shift fork 130 comprises and is half-terete main body 132, the outer surface of main body 132 is provided with through hole 134 and accommodates the curve bath 136 of C shape metal ring 160, also be provided with three through holes (not shown) that connect inner and outer surface in the curve bath 136, three legs 162 of C shape metal ring 160 pass these three through holes respectively and extend radially inwardly; The internal surface of main body 132 is provided with axially extended protruding shin 138, downwards the joint 140 that extends.

The excircle of first planet carrier 68 is provided with external toothing 142, and the rear end is provided with support 144 and is used to connect first planetary gear set 62, and the front end center is provided with first sun gear 146.

The rear end of second planet carrier 70 is provided with support 148 and is used to connect second planetary gear set 64, and the front end center is provided with second sun gear 150.

The rear end of the third line star frame 72 is provided with support 152 and is used to connect the third line star-wheel group 66, the ring gear (not shown) of external toothing 27 engagements of setting of front end center and output shaft 28.

When mounted, moment of torsion control ring 80 is housed in the first gear-box casing 40, its annular body 82, arc leg 84 straddle both sides at supporting disk 36 with moment of torsion control ring 80 axial restraints, and the radial projection 35 that curve bath 86 parts are accommodated on the supporting disk 36 makes moment of torsion control ring 80 to rotate within the specific limits.One end of two extension springs 166 and the circular protrusion 92 of moment of torsion control ring 80 connect, the other end respectively with supporting disk 36 on two attachment holes 34 matched, extension spring 166 is used for the rotary reset of moment of torsion control ring 80.The motor shaft 22 of motor 24 passes the center hole 32 of supporting disk 36, first planetary gear set, 62 rotations of first ring gear, 74 engagements on driving and the moment of torsion control ring 80, and then drive the rotation of first planet carrier 68, first sun gear, 146 drivings of first planet carrier 68 are rotated with second planetary gear set 64 that second ring gear 76 on the speed ring 120 meshes, and then drive the rotation of second planet carrier 70, second sun gear 150 of second planet carrier 70 drives the third line star-wheel group 66 rotations with 78 engagements of the 3rd ring gear, thereby drive output shaft 28 rotations, export certain rotating speed.

Speed governing shift fork 130 covers on the excircle of the first gear-box casing 40, and first axial long hole 42 that its joint 140 passes on the first gear-box casing 40 is housed in the arcuation groove 97 of moment of torsion control ring 80; The protruding shin 138 of speed governing shift fork 130 is housed in the axial channel 46 of the first gear-box casing 40, and speed governing shift fork 130 guide groove 46 vertically axially moves; Three second axial long holes 44 that three legs 162 of the C shape metal ring 160 that connects with speed governing shift fork 130 pass respectively on the first gear-box casing 40 are connected with the circular groove 122 of speed ring 120 excircles.One end of extension spring 164 is connected with the through hole 134 of speed governing shift fork 130, and the other end is connected with radial projection 56 on the second gear-box casing 58.

Shown in Fig. 1 to Fig. 6 c, pressing switch 26 starting electrical machinerys 24 electric drills 20 in use starts working, switch 26 drives support 25 and moves backward to break away from the leg 174 of positioning pluging rod 170 and be connected when pressing, electric drill 20 is in first working state, 76 whiles of second ring gear of speed ring 120 mesh with external toothing 142, second planetary gear set 64 of first planet carrier 68 at this moment, and the joint 140 of speed governing shift fork 130 is housed in the arcuation groove 97 of moment of torsion control ring 80.When load torque increases, and motor 24 output powers are when constant, 80 rotations of first planetary gear set, 62 driving torque control rings, when the load torque variation does not reach predetermined value, since the joint 140 of speed governing shift fork 130 be subjected to arc groove 97 front-end face stop can not axial motion shown in Fig. 6 a, thereby make electric drill 20 in the first stable working state work, output at a high speed.When the load torque variation reaches predetermined value, the rotation of moment of torsion control ring 80 makes the joint 140 of speed governing shift fork 130 break away from the stopping of front-end face of arcuation groove 97, and in the effect lower edge of extension spring 164 axial notch 91 axial advancement shown in Fig. 6 b, and then the C shape metal ring by speed governing shift fork 130 160 drives speed rings 120 to axial advancement, second ring gear 76 of speed ring 120 and the external toothing of first planet carrier 68 142 break away from, dock with gear-box casing inner wall groove 38 with the projection 124 of second planetary gear set, 64 engagement while speed ring 120 peripheries, when the rotation of moment of torsion control ring 80 makes that the joint 140 of speed governing shift fork 130 has broken away from the stopping of front-end face of arcuation groove 97, an axial bore 90 on moment of torsion control ring 80 front-end faces 88 rotates to axial bore 48 aligned positions with the first gear-box casing, 40 rear ends, this moment, the main body 172 of positioning pluging rod 170 was stretched out under the effect of stage clip 180 in the insertion axial bore 90 backward, and electric drill 20 is stabilized in the second working state work.When loosening switch 26 electric drill 20 quit work, leg 174 compression press springs 180 reaches that the support 25 of switch 26 promotes positioning pluging rod 170 make the main body 172 of positioning pluging rod 170 break away from axial bore 90, moment of torsion control ring 80 rotary reset round about under the effect of extension spring 166 simultaneously, the joint 140 of speed governing shift fork 130 moves after axially and the hypotenuse that promotes slide bar 110 makes it pivot shown in Fig. 6 c around connecting end 116 along oblique groove 93, get back in the arcuation groove 97 until the joint 140 of speed governing shift fork 130, the hypotenuse of slide bar 110 is returned to the position of the side 102 that is resisted against bump 104 under the effect of metal clips 112 at this moment.When reusing, enable switch 26 repeats said process.

Referring to Fig. 7 and shown in Figure 8, the difference of second preferred embodiment of the present utility model and first preferred embodiment is that the ear end face 95 ' middle part of chute 96 ' of moment of torsion control ring 80a is to projecting inward formation bump, the excircle of second planet carrier 70 ' is provided with external toothing 142 ', the rear end of speed ring 120 ' outer peripheral surface is provided with a plurality of circumferential equally distributed projections 124 ', this projection 124 ' matches with a plurality of grooves 38 ' of the first gear-box casing, 40 ' internal surface separatably, between the radial projection 56 of the second gear-box casing 58 and speed governing shift fork 130 stage clip 165 is set.When first working state, the 76 ' while of second ring gear of speed ring 120 ' and the external tooth 142 ' of second planet carrier 70 ', 64 engagements of second planetary gear set.When the load torque variation reaches predetermined value, the rotation of moment of torsion control ring 80a makes speed governing shift fork 130 move backward at the effect lower shaft of stage clip 165, and then drive speed ring 120 ' moves after axially, in the second working state work, second ring gear 76 ' of speed ring 120 ' and the external tooth of second planet carrier 70 ' 142 ' break away from, and dock with gear-box casing inner wall groove 38 ' with the projection 124 ' of second planetary gear set, 64 engagement while speed ring 120 ' periphery.

Referring to Fig. 9 and shown in Figure 10, the difference of the 3rd preferred embodiment of the present utility model and first or second preferred embodiment is, substitutes extension spring 166 with stage clip 167 and realizes resetting of moment of torsion control ring 80b.The outer peripheral surface of moment of torsion control ring 80b is provided with second arc groove 81, second arc groove 81 comprises both sides end face 83, the inner peripheral surface of supporting disk 36 ' is provided with that the arc groove (not shown) corresponding with second arc groove 81 is common to constitute the containing space of accommodating stage clip 167, the two ends of stage clip 167 are resisted against respectively on the both sides end face 83 of second arc groove 81, make moment of torsion control ring 80b to automatically reset.

Referring to shown in Figure 11, the difference of the 4th preferred embodiment of the present utility model and first, second or the 3rd preferred embodiment is that the slide bar 110 of moment of torsion control ring 80c fixedly installs in the first arcuation groove, the side 102 of the hypotenuse of main body 114 and bump 104 constitutes oblique groove 93 ', rises gradually from an end a to end that connects arcuation groove 97 that connects axial notch 91 and make its end face 181 be higher than the bottom surface of arcuation groove 97 in the bottom surface of oblique groove 93 '.A straight flange of main body 114, the end face 181 of oblique groove 93 constitute the continuous end face of arcuation groove 97 with the top margin 100 of bump 104.Another straight flange of main body 114 and the side end face of the first arcuation groove 99 constitute axial notch 91.

Equally, metal clips 112 also can be connected with slide bar 110 with an end, and the torsion spring that the other end is connected with chute 96 substitutes realizes resetting of slide bar 110.The groove (38) of gear-box casing (30) also can substitute with the sphenoid surface that goes in ring, and the projection (124) of corresponding speed ring (120) substitutes with another sphenoid surface of butt joint with it, stops the rotation of speed ring (120) by frictional force when butt joint.The joint 140 of speed governing shift fork 130 can be to be wholely set with main body 132; Also can be that pin inserts the formation of main body through hole; Pin is contained in the blind hole that is arranged on the speed governing shift fork 130 forms, further can in blind hole, accommodate a spring and make pin on it is axial, can move.Equally, those of ordinary skills are easy to realize being arranged on the chute on the moment of torsion control ring and are arranged on joint transposition on the speed governing shift fork, make chute be arranged on the speed governing shift fork, and joint is arranged on the moment of torsion control ring.In a word, the utility model is not limited to the specific embodiment structure of being lifted, and the structure of conceiving based on the utility model all belongs to the utility model protection domain.

Claims

1. speed change tool, comprise switch (26), gear-box casing (30), motor (24), output shaft (28), the multistage drive gear mechanism (60) and the speed ring (120 that connect with described motor (24) and described output shaft (28), 120 '), moment of torsion control ring (80 by described multistage drive gear mechanism (60) rotary driving, 80a, 80b, 80c), it is characterized in that: described speed change tool also comprises and described speed ring (120,120 ') the speed governing shift fork (130) that connects and along described speed ring (120, first elastic element (164 of the described speed governing shift fork of axial driving 120 ') (130), 165), described moment of torsion control ring (80,80a, 80b, 80c) and be provided with second elastic element (166 between the described casing (30), 167), described moment of torsion control ring (80,80a, 80b, 80c) be provided with chute (96 with described speed governing shift fork (130) the two one of them, 96 '), another is provided with and is housed in described chute (96 movably, 96 ') Nei joint (140), when the output shaft load reaches predetermined value, described moment of torsion control ring (80,80a, 80b 80c) overcomes the rotation of second elastic element (166,167) elastic force, make described speed governing shift fork (130) at described first elastic element (164,165) driving is axially moved down, thereby drives described speed ring (120,120 ') move in the primary importance and the second place.

2. speed change tool according to claim 1, it is characterized in that: described chute (96,96 ') comprise at least one arcuation groove (97), an axial notch (91) and an oblique groove (93) that connects described arcuation groove (97) and described axial notch (91), described arcuation groove (97), described axial notch (91) forms continuous path with described oblique groove (93).

3. speed change tool according to claim 1 and 2 is characterized in that: described chute (96,96 ') be arranged on described moment of torsion control ring (80,80a, 80b, 80c) on the excircle, described chute (96,96 ') comprises two axial ends (95,98; 95 ', 98 ') and two side direction end faces (99), a described axial end (98,95 ') middle part is to projecting inward, described bump (104) comprises a top margin (100) and dual-side (102), described chute (96,96 ') two ends are respectively arranged with a pair of slide bar (110), described slide bar (110) comprises the main body (114) of rectangular triangle or right-angled trapezium, a straight flange of described main body (114) can be with the top margin (100) and described chute (96 of described bump (104), 96 ') another axial end (95,98 ') constitute arcuation groove (97), another straight flange of described main body (114) and described chute (96,96 ') side end face (99) constitutes axial notch (91), and the side (102) of the hypotenuse of described main body (114) and described bump (104) constitutes oblique groove (93).

4. speed change tool according to claim 3, it is characterized in that: an end freedom of described slide bar (110), the other end rotatably with described chute (96,96 ') connect, described slide bar (110) comprises the connecting end (116) that is radially extended by described main body (114) downwards, described connecting end (116) and described chute (96,96 ') be provided with the 3rd elastic element (112) between, described slide bar (110) makes the hypotenuse of described main body (114) be resisted against on the side (102) of described bump (104) under described the 3rd elastic element (112) effect, and a straight flange of described main body (114) and the top margin (100) of described bump (104) constitute the continuous end face of described arcuation groove (97).

5. speed change tool according to claim 4 is characterized in that: described the 3rd elastic element (112) is that an end is connected with described slide bar (110), the torsion spring that the other end and described chute (96,96 ') connect.

6. speed change tool according to claim 4, it is characterized in that: the inner circumference of described first ring gear is provided with first arc groove (106) and two described chutes (96 of perforation, 96 ') and the through hole (94) of first arc groove (106), described connecting end (116) is provided with groove (118), the connecting end (116) of described slide bar (110) passes described through hole (94), and described the 3rd elastic element (112) is for matching with groove (118) on the described slide bar (110) in metal clips is housed in described first arc groove (106).

7. speed change tool according to claim 3, it is characterized in that: rise gradually from an end a to end that connects described arcuation groove (97) that connects described axial notch (91) and make its end face (181) be higher than the bottom surface of described arcuation groove (97) in the bottom surface of described oblique groove (93), and the end face (181) of a straight flange of described main body (114), described oblique groove (93) constitutes the continuous end face of described arcuation groove (97) with the top margin (100) of described bump (104).

8. speed change tool according to claim 1 and 2 is characterized in that: described first elastic element (164) is that an end is connected the extension spring that the other end is connected with speed governing shift fork (130) with described gear punch-out equipment (30) shell.

9. speed change tool according to claim 1 and 2 is characterized in that: described first elastic element (165) is a stage clip.

10. speed change tool according to claim 1 and 2, it is characterized in that: described second elastic element (166) is a pair of described moment of torsion control ring (80 that is arranged on, 80a, 80c) the extension spring of periphery, described extension spring one end and described moment of torsion control ring (80,80a 80c) connects, and the other end links to each other with described gear-box casing (30).

11. speed change tool according to claim 1 and 2, it is characterized in that: the excircle of described moment of torsion control ring (80b) also is provided with second arc groove (81) and accommodates described second elastic element (167), described second elastic element (167) be two ends respectively with second arc groove (81) both sides end faces (83) against stage clip.

12. speed change tool according to claim 1 and 2, it is characterized in that: described multistage drive gear mechanism (60) comprises first planet carrier (68) at least, first planetary gear set (62), be arranged on described moment of torsion control ring (80,80a, 80b, 80c) first ring gear (74) on the inner circumference, second planet carrier (70) and second planetary gear set (64), described gear-box casing (30) is provided with first link (38,38 '), described speed ring (120,120 ') comprise the internal tooth (76 that is arranged on the inner circumference, 76 ') and be arranged on second link (124 on the excircle, 124 '), described second link (124,124 ') connects separatably with described first link (38,38 ').

13. speed change tool according to claim 12, it is characterized in that: described speed ring (120) is its internal tooth (76) and described first planet carrier (68) and described second planetary gear set (64) engagement when primary importance, described speed ring (120) its internal tooth (76) when the second place breaks away from described first planet carrier (68), with second planetary gear set (64) engagement, second link (124) of described speed ring (120) docks with first link (38) of described gear-box casing (30).

14. speed change tool according to claim 12 is characterized in that: described first link (38) is a plurality of grooves, and described second link (124) is a plurality of projections with described groove relative set.

15. speed change tool according to claim 1 and 2, it is characterized in that: described moment of torsion control ring (80,80a, 80b, front-end face 80c) is provided with two axial first holes (90), the 3rd hole (50) that described gear-box casing (30) is provided with axial second hole (48) and communicates with second hole (48), contain stage clip (180) and positioning pluging rod (170) in described second hole (48), described positioning pluging rod (170) comprises the main body (172) that axially extends back along second hole (48) and passes the 3rd hole (50) and stretch out leg (174) outside the described gear-box casing (30) that described leg (174) is connected separatably with described switch (26).

16. speed change tool according to claim 1 and 2, it is characterized in that: described speed governing shift fork (130) is to be connected by C shape metal ring (160) with described speed ring (120,120 '), described metal ring (160) is fixedlyed connected with described speed governing shift fork (130), described speed ring (120,120 ') periphery be provided with circumferential groove in its end portion (122) accommodate described metal ring (160) and can be described relatively the metal ring rotation.