CN202702199U

CN202702199U - Power tool

Info

Publication number: CN202702199U
Application number: CN2012202905781U
Authority: CN
Inventors: 钟红风; 庞晓丽; 陈志�
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2011-08-06
Filing date: 2012-06-20
Publication date: 2013-01-30
Anticipated expiration: 2022-06-20
Also published as: CN202702200U; CN102909679A; CN102909710A; CN102909710B; CN102909702A; CN102909676B; CN104476472B; CN102909676A; CN202702201U; CN104385205B; CN104476472A; CN102909703A; CN102909702B; CN102909677B; CN102909701B; CN102909677A; CN102909709A; CN104385206A; CN102909701A; CN102909709B

Abstract

The utility model relates to a power tool which comprises a machine casing, a motor, an output shaft, a transmission mechanism, a working head supporting mechanism and a connecting shaft. The motor is arranged in the machine casing and outputs rotary power, the output shaft is provided with an accommodating hole, the accommodating hole is arranged axially and used for accommodating a working head, the transmission mechanism is arranged between the motor and the output shaft and enables the rotary power output by the motor to be delivered to the output shaft, and the working head supporting mechanism is arranged in the machine casing and provided with a plurality of parallelly arranged accommodating spaces for supporting the working head. The connecting shaft is arranged in the machine casing and can move between two positions. At the first position, the connecting shaft is connected with the working head in matched mode so as to enable the working head to be located at a working position in the accommodating hole; at the second position, the connecting shaft enables the working head to be located at an accommodating position of the working head supporting mechanism, and the connecting shaft and the working head can be separated axially. A guide device is arranged adjacent to the working head supporting mechanism, the connecting shaft moves from the first position to the second position, the working head and the connecting shaft are separated axially under the effect of the guide device, and the working head is retained in the accommodating position.

Description

Power tool

Technical field

The utility model relates to a kind of power tool, relates in particular to a kind of storage and quick-replaceable drill gun class power tool of realizing working head.

Background technology

In existing drill gun class power tool, generally include electric drill, electric screw driver and percussion drill.

Electric screw driver is for a kind of commonly used electric tool of screw-driving to the workpiece.When needing in the use procedure to tighten the screw of different size, change different working heads according to the difference of screw specification, namely screwdriver bit namely will take off the working head of original installation, then loads onto the working head of another kind of structure.Under the use occasion that needs the frequent working head, brought great inconvenience to the operator, caused the replacing working head loaded down with trivial details on the one hand, the working head that takes off is on the other hand placed easily everywhere and is lost.Although, some storage that can realize working head and quick-replaceables are arranged, because the inherent defect of hand-operated tools in some hand-operated tools, be that moment of torsion is little, operation is hard, so that the operator is easy to fatigue, cause inefficiency, be not suitable in industrial sector, using as professional instrument.

Chinese utility model patent CN201086280Y has disclosed a kind of Multi-tool head electric tool, comprise power tool body and multi-knife-head rotaring wheel structure, the multi-knife-head rotaring wheel structure comprises the multi-knife-head runner cylinder that can accommodate a plurality of cutter heads, multi-knife-head runner cylinder can link to each other with tool body in axial sliding, when multi-knife-head runner cylinder slides into position away from tool body, thereby can select the cutter head that needs by rotation multi-knife-head runner cylinder.But at multi-knife-head runner cylinder during away from tool body, its connecting axle is exposed, dust, powder can enter the inside of electric tool inside or multi-knife-head runner cylinder in the process that multi-knife-head runner cylinder slides, time has been grown and can cause multi-knife-head runner cylinder to rotate to carry out cutter head to select, and perhaps directly causes electric tool to use.And work time working head be to be against on the workpiece, connecting axle need to bear reciprocal active force like this, thereby connecting axle can bring the pressure transmission mechanism not to be delivered to connecting axle to moment of torsion to transmission mechanism, and such structure is also so that the transmission of Multi-tool head electric tool is unreliable.

And, if during operator's disable motor manual rotation cutter head, may trigger cutter head and drive the connecting axle rotation and then make the motor rotation may damage motor.

In addition, when changing cutter head, need first cutter head to be retracted into the runner cylinder, cutter head is held by magnet and leaves from the runner cylinder when preventing that the runner cylinder from moving axially, Chinese utility model patent CN201086280Y has disclosed it and has thrown off to prevent cutter head and runner cylinder by the mode that retainer ring is set at cutter head, it is customized especially that but such cutter head needs, so that the use of instrument does not have versatility.And directly more unstable by connecting axle band dynamic cutter head speed ratio, because the length of connecting axle is longer, beating of connecting axle is just larger, gives the user of instrument with serving potential danger.Moreover, because need to moving axially with connecting axle, separates by the runner cylinder, be easy to enter dust and other impurities and can't clean.

The utility model content

For the deficiencies in the prior art, the purpose of this utility model is to provide a kind of reliable operation, power tool that cost is low.

The technical scheme that its technical problem that solves the utility model adopts is: a kind of power tool comprises: casing; Motor is arranged in the casing, and outputting rotary power; Output shaft has the accepting hole that holds working head of axial setting; Transmission mechanism is arranged between motor and the output shaft and also the rotary power of motor output can be passed to output shaft; The working head supporting mechanism, be arranged in the casing, described working head supporting mechanism has several receiving spaces that are set up in parallel for the support works head, and described working head supporting mechanism can be adjusted to one of them receiving space and the axial corresponding position of output shaft; Connecting axle is arranged in the casing, and described connecting axle can move between two positions, and in primary importance, described connecting axle and working head connect and make working head to be in the operating position that is positioned at accepting hole; In the second place, described connecting axle working head is in be positioned at the working head supporting mechanism collecting position and can with the working head axial separation; Described power tool also comprises the return device of leading in abutting connection with the setting of working head supporting mechanism, and described connecting axle moves to the second place from primary importance, described working head under the effect of leading return device with the connecting axle axial separation and remain on collecting position.

Preferably, the described return device of leading comprises the supporting surface that contacts with the working head supporting mechanism and the spigot surface that links to each other with supporting surface, and described working head supporting mechanism position adjustment can drive the working head that engages with connecting axle and separate with connecting axle under the effect of spigot surface.

Preferably, described working head supporting mechanism and transmission mechanism are provided with cover plate, and described supporting surface and spigot surface are arranged on the cover plate.

Preferably, be provided with the step projection along working head along with the movement locus of working head supporting mechanism position adjustment on the described cover plate, described supporting surface and spigot surface are arranged on the step projection.

Preferably, the position of corresponding connecting axle is provided with perforation on the described cover plate, and described spigot surface outwards highly increases progressively from perforation place.

Preferably, described spigot surface is provided with two, and two spigot surfaces are positioned at working head along with on the movement locus of working head supporting mechanism position adjustment and be distributed in the perforation both sides.

Preferably, described spigot surface is around arranging in a week of described perforation.

Preferably, described spigot surface is the inclined-plane.

Preferably, described inclined-plane is spent between 30 degree 10 with respect to the angle of inclination of storage folder end face.

Preferably, described working head supporting mechanism is rotatable is supported between casing and the described cover plate.

Preferably, described connecting axle is connected between transmission mechanism and the output shaft, and the rotary power that described transmission mechanism is exported motor by described connecting axle passes to output shaft.

Compared with prior art, the beneficial effects of the utility model are: power tool of the present utility model makes connecting axle separate with working head by simple structure, and working head is remained in the working head supporting mechanism, and guaranteed higher reliability, lowered simultaneously cost.

Description of drawings

Fig. 1 is the cutaway view of the preferred power tool of the utility model when in running order.

Fig. 2 is the part three-dimensional exploded view of Fig. 1 medium power instrument.

Fig. 3 is that Fig. 1 medium power instrument is along the cross-sectional schematic of E-E line.

Fig. 4 is the cross-sectional schematic of another kind of embodiment of the pinion gear mechanism of Fig. 3 medium power instrument.

Fig. 5 is that Fig. 1 medium power instrument is in the cutaway view when changing the working head state.

Fig. 6 is the three-dimensional exploded view of the self-locking device part of Fig. 5 medium power instrument.

Fig. 7 is along the cutaway view of F-F direction among Fig. 5.

Fig. 8 is the use state reference map (this moment, the output planet carrier was rotated counterclockwise) of self-locking device among Fig. 7.

Fig. 9 is the use state reference map (this moment, transfer panel turned clockwise) of self-locking device among Fig. 7.

The schematic diagram of the first embodiment that the restriction working head retreated along with connecting axle when Figure 10 was Fig. 1 medium power tool changing working head.

Figure 11 is that block piece is in the schematic diagram that allows the position that connecting axle moves among Figure 10.

Figure 12 is the schematic diagram that block piece is in the position that the restraint of labour head retreats among Figure 10.

The schematic diagram of the second embodiment that the restriction working head retreated along with connecting axle when Figure 13 was Fig. 1 medium power tool changing working head.

Figure 14 is that block piece is in the schematic diagram that allows the position that connecting axle moves among Figure 13.

Figure 15 is the schematic diagram that block piece is in the position that the restraint of labour head retreats among Figure 13.

The schematic diagram of the 3rd embodiment that the restriction working head retreated along with connecting axle when Figure 16 was Fig. 1 medium power tool changing working head.

The schematic diagram of the 4th embodiment that the restriction working head retreated along with connecting axle when Figure 17 was Fig. 1 medium power tool changing working head.

Figure 18 is that working head is limited the operation principle schematic diagram that retreats along with connecting axle among Figure 16, and wherein connecting axle drives that working head is got back to the storage folder and connecting axle leaves the storage folder.

Figure 19 is similar to Figure 18, wherein storage folder rotation, working head and spigot surface butt.

Figure 20 is similar to Figure 18, wherein storage folder rotation, working head under the effect of spigot surface with the connecting axle axial separation.

Wherein,

1. casing 2. motors 3. transmission mechanisms

4. output shaft 6. batteries 7. press buttones

9. working head 11. handles 13. fore shells

15. gathering sill 21. motor shafts 22. gear-boxes

30. pinion gear mechanism 31. planetary gear reducing mechanisms 40. sleeves

41. accepting hole 50. fixed blocks 51. connecting axles

52. storage folder 53. slip lids 54. steel caps

56.U type spring 57. shell fragments 81. limited blocks

131. perforate 133. opened portion 134. radial direction through hole

221. dividing plate 223. toothed wheel box cover plates 225. arched members

301. the first gear 302. second gears 303. the 3rd gear

308. gear shaft 313. output planet carriers 321. fixed disks

322. transfer panel 323. rollers 511. magnet

512. support end 521. is accommodated storehouse 522. pressing plates

523. opening 526.U type groove 531. guide rails

535. the first projection 536. second projections 537. tread plates

571. elasticated end 2231. perforation 2232. steps projection

2233. spigot surface 2233a. spigot surface 3181. plat parts

3131 legs 3211 are pin 3212 inner headed faces fixedly

3221 planes, 3222 flat square hole 3223 spline tooths

The specific embodiment

In the preferred embodiment of the utility model power tool, power tool is powered screwdriver, difference according to power source can be divided into pneumatic screw driver, screwdriver and electric screw driver surge, direct current and dividing of exchanging are also arranged in the electric screw driver, and the utility model preferably is specifically described as an example of DC electric screwdriver example.

Referring to figs. 1 through shown in Figure 3, this DC electric screwdriver comprises casing 1, motor 2, battery 6, transmission mechanism 3, connecting axle 51, working head supporting mechanism and output shaft 4.Casing 1 is closed up by screw (not shown) by symmetrical two and half housings and assembles, its have horizontal component and with horizontal component handle 11 parts that arrange of K in obtuse angle, to between 130 degree, meeting was pleasant when gripping handle 11 operated like this at 100 degree for the preferred angle K of the utility model.Top in handle 11 parts is provided with press button 7, and battery 6 is fixed on the rear portion of handle 11 parts, and transmission mechanism 3 is housed in the horizontal component of casing 1.As preferred embodiment, this battery 6 can be lithium ion battery.Need to prove, said lithium ion battery is that negative material is the general name of the rechargeable battery of elemental lithium here, and according to the difference of positive electrode, it can consist of many systems, such as " lithium manganese " battery, and " lithium iron " battery etc.In the present embodiment, lithium ion battery is that a joint rated voltage is 3.6V(volt) lithium ion battery.Certainly, battery 6 also can be the battery types well known to those skilled in the art such as NI-G, ni-mh.

Transmission mechanism 3 by before backward (take the right side of drawing for after) comprise planetary gear reducing mechanism 31 and pinion gear mechanism 30 by motor 2 drivings, wherein pinion gear mechanism 30 links to each other with connecting axle 51, and by connecting axle 51 rotatablely moving of motor 2 is passed to output shaft 4.Wherein the working head supporting mechanism is used for storing different working heads, the working head here mainly refers to electric screw driver Philip's head screw screwdriver bit commonly used, slot type screwdriver head, drill bit etc., move axially and pass the working head supporting mechanism or leave the working head supporting mechanism by operation connecting axle 51, and adjust the position of working head supporting mechanism, just can be when electric screw driver be tightened or unclamp different screws the different working head of quick-replaceable.

According to the composition of above electric screw driver, electric screw driver can be successively by before backward (take the right side of drawing for after) be divided into the motor part D that motor is set, the driving section C of transmission mechanism 3 is set, the storage part B that storage presss from both sides and the efferent A that output shaft is set are set.

Motor 2 in the utility model preferred embodiment is motor, and motor has from electric machine casing extended motor shaft 21 forward.Motor is fixed in the casing 1, one gear-box 22 is fixed in the casing 1 and is positioned at the front portion of motor, gear-box 22 is used for accommodating planetary gear reducing mechanism 31 and pinion gear mechanism 30, by dividing plate 221 is set between planetary gear reducing mechanism 31 and pinion gear mechanism 30 the two is separated, and toothed wheel box cover plate 223 is set between gear-box 22 and the working head supporting mechanism, transmission mechanism 3 and working head supporting mechanism can be separated like this, namely transmission mechanism 3 and working head supporting mechanism are separate.But pinion gear mechanism 30 comprises the first gear 301 that is connected by a gear shaft 308 transmitting torques with planetary gear reducing mechanism 31, the 3rd gear 303 that is connected with connecting axle 51 and the second gear 302 that meshes simultaneously with the first gear 301 and the 3rd gear 303, wherein gear shaft 308 can be wholely set with the first gear 301, the second gear 302 passes to the 3rd gear 303 with the rotation of the first gear 301, and the two ends of each gear are supported by axle sleeve.The middle part of dividing plate 221 is provided with the hole that the axle for the first gear 301 passes, the end face of dividing plate 221 is provided with for the groove that axle sleeve is installed, the rear axle housing that supports pinion gear mechanism 30 is fixed on the dividing plate 221, front shaft sleeve is fixed on the toothed wheel box cover plate 223, toothed wheel box cover plate 223 can be fixedly linked by screw, buckle etc. with gear-box 22, so, namely can separate pinion gear mechanism 30 and planetary gear reducing mechanism 31, both can be sealed again simultaneously, prevent that dust, powder etc. from entering transmission mechanism 3 inside, also can prevent the leakage of lubricating oil.

With reference to Fig. 3, the first gear 301, the center line of the second gear 302 and the 3rd gear 303 is arranged on the same straight line, in order to make transmission more steady, the gearratio that is transferred to the 3rd gear 303 from the first gear 301 is 1:1, can be that the first gear 301 to second gears 302 are the speedup transmission like this, the second gear 302 to the 3rd gears 303 are deceleration transmission, reference diameter such as the first gear 301 and the 3rd gear 303 equates, the reference diameter of the second gear 302 is less than the reference diameter of the first gear 301 and the 3rd gear 303, optimal location in the time of can guaranteeing that three gear centres are coaxial so is set, and the space that takies is minimum.If but when electric screw driver compared miniaturization, what the second gear 302 arranged can need to arrange the less number of teeth than I, the number of teeth that causes meshing simultaneously between gear tails off, and transmission intensity descends so that transmission is unstable.As cancel the second gear 302, the first gear 301 and the 3rd gear 303 are arranged to direct engagement, also motion can be transmitted, but the diameter of the first gear 301 and the 3rd gear 303 must be increased like this, and the volume that certainly will increase more greatly electric screw driver of the first gear 301,303 settings of the 3rd gear.For this reason, with reference to Fig. 4, can be with the pivot line eccentric setting of the second gear 302 with respect to the first gear 301 and the 3rd gear 303, the size that had so both guaranteed the second gear 302 can be not too small, the size of three gear arragement directions arranged side by side can be not excessive yet simultaneously, can guarantee that three gearratios between the gear are more steady, preferred eccentric size L is between 0.1 times to 0.3 times of the first gear 301 reference diameters, the reference diameter of other the first gear 301 is between 1.1 to 1.5 times of reference diameter of the second gear 302, guarantee that bearing capacity is higher between three gears, and efficient is high, and the life-span is long.In addition, three gears are set make the inner space of instrument compacter, thereby do not affect the attractive in appearance of outside.

Certainly, also can be arranged to as required two gears, one links to each other with planetary gear reducing mechanism 31, and another links to each other with connecting axle 51.In addition, transmission mechanism 3 is not limited to above-described form, and transmission mechanism 3 can include only planetary gear reducing mechanism 31, perhaps includes only pinion gear mechanism 30, and perhaps other the transmission mechanism that rotatablely moves is such as ratchet mechanism, turbine mechanism etc.Wherein planetary gear reducing mechanism 31 has three grades of deceleration systems, motor shaft 21 extends and planetary gear reducing mechanism 31 engagements, planetary gear reducing mechanism 31 will rotatablely move and pass to pinion gear mechanism 30, and pinion gear mechanism 30 drives connecting axle 51 rotations, again driver output axle rotation of connecting axle 51.When motor 2 moves like this, by planetary gear reducing mechanism 31, pinion gear mechanism 30, finally by output shaft 4 outputs.This shows, the driving-chain in the present embodiment is motor-transmission mechanism-connecting axle-output shaft, and namely connecting axle is as the part of driving-chain.In addition, reducing gear is slowed down by third-level planetary and the two-stage parallel axis deceleration system consists of the output speed that obtains to want, in other embodiments, and depending on the rotating speed of required output, reducing gear can include only the secondary planet deceleration system, perhaps other deceleration systems.

With reference to Fig. 5, Fig. 6, shown in Figure 7, planetary gear reducing mechanism 31 comprises output planet carrier 313.Electric screw driver is provided with self-locking device between planetary gear reducing mechanism 31 and pinion gear mechanism 30, self-locking device comprises a fixed disk 321, periphery at fixed disk 321 evenly is provided with several fixedly pins 3211, these fixedly pin 3211 closely connect as one with gear-box 22, make fixed disk 321 be inactive state with respect to casing 1 and gear-box 22, then be formed with inner headed face 3212 in the inside circumference of fixed disk 321.In the scope of inner headed face 3212, be provided with a transfer panel 322, the core of transfer panel 322 arranges flat square hole 3222.Gear shaft 308 1 ends connect the first gear 301, are arranged to plat part 3181 on the other end, and transfer panel 322 connects as one by flat square hole 3222 and plat part 3181 with gear shaft 308, thereby can rotate together with gear shaft 308.The connected mode that wherein adopts can be that the spline joint habitually practised of those skilled in that art and other connected mode of easily expecting are replaced.Self-locking device also comprises a plurality of legs 3131 of giving prominence to the first gear 301 directions from the end face of output planet carrier 313, and leg 3131 is fixedly installed on the output planet carrier 313.

The periphery of transfer panel 322 is formed with a plurality of planes 3221, and the end near output planet carrier 313 on the transfer panel 322 is provided with connecting portion, and this connecting portion adopts spline tooth 3223, and transfer panel 322 is by

spline tooth

3223 and 313 loose fits of output planet carrier.Between fixed disk 321 and the transfer panel 322, the position is to be respectively equipped with roller 323 between the plane 3221 of the inner headed face 3212 of fixed disk 321 and transfer panel 322 more specifically, and roller 323 is against inner headed face 3212 and plane 3221, and can roll in the present position.In addition, be inserted with the leg 3131 of output planet carrier 313 between each roller 323, that is to say, leg 3131 is arranged between the outside disc of the inner headed face 3212 of fixed disk 321 and transfer panel 322.Leg 3131 is matched in clearance with inner headed face 3212 and the transfer panel 322 of fixed disk 321, so leg 3131 can be around the center rotating of transfer panel 322.

With further reference to Fig. 8, when trigger button switch 7, rotation output take motor 2 is counterclockwise as example, the rotation torque that motor 2 produces is delivered on the output planet carrier 313, output planet carrier 313 transfer panels 322 relative and that its spline connects turn over certain angle, and the leg 3131 of output planet carrier is with the rotation on the output planet carrier 313 generation respective direction at this moment.Wherein, after leg 3131 rotates one section micro-displacement, be resisted against on the roller 323, because roller 323 is that small end from the face of carving that is formed between these two by the plane 3221 of inner headed face 3212, transfer panel 322 is to large end motion, so roller 323 can be output end planet carrier leg 3131 and promote, following output planet carrier 313 rotates, until spline tooth 3223 contacts side surfaces of output planet carrier 313 and transfer panel 322, this moment, the leg 3131 of output planet carrier drove transfer panels 322 rotations with roller 323.Like this, the rotation torque of motor 2 will be delivered on the gear shaft 308 that is fixedly connected with transfer panel 322, and further be delivered to the first gear 301, be delivered on the output shaft 4 by the second gear 302, the 3rd gear 303 and connecting axle 51, thereby output shaft 4 drives working head 9 rotations.

With further reference to Fig. 9, when press button 7 disconnections, motor 2 stops the rotation and without spin moment of torsion output.At this moment, no matter the operator turns output shaft 4 along clockwise direction or counterclockwise or is contained in working head 9 in the output shaft 4, what show will be that gear shaft 308 can be along with the small rotation that produces respective direction, because gear shaft 308 connects as one by flat side with transfer panel 322, transfer panel 322 also will be with the rotation on the gear shaft 308 generation respective direction.And roller 323 is rolled into position shown in the solid line by the position shown in the dotted line, because roller 323 is that large end from the face of carving that is formed between these two by the plane 3221 of inner headed face 3212, transfer panel 322 is to little end motion, this moment fixed disk 321 planes 3221, inner headed face 3212, with plane 3221 threes of transfer panel 322 between mutually carve tightly, gear shaft 308 can not drive 41 rotations of output planet carrier support, be that gear shaft 308 automatically locks, that is to say rotatablely moves can't be delivered to output planet carrier 313 from output shaft 4.Because the setting of self-locking structure is so that the operator can select the manual rotation electric screw driver to twist screw.Be particularly useful for working as electric screw driver under electric model, screw is screwed onto in the situation about substantially putting in place, can motor 2 is stopped by press button 7, under the manual mode, rotate this electric screw driver screw is screwed to the position, thereby avoided screw to descend to twist and cause the sliding tooth of screw at electric model.This electric screw driver can be described as the screwdriver of a hand, electric integral, and is easy to operate and be easy to carry.

Self-locking device is arranged between planetary gear reducing mechanism 31 and pinion gear mechanism 30 in the above-mentioned embodiment, those skilled in the art are easy to expect that other positions that self-locking device is arranged between motor 2 and the output shaft 4 also can realize motor 2 to the single-direction transmission of output shaft 4, as between motor 2 and the planetary gear reducing mechanism 31, between the pinion gear mechanism 30 and between the connecting axle 51 etc.The version of self-locking device also is not limited to above-mentioned embodiment, and any self-locking device of single-direction transmission of can realizing can be applied on the preferred electric screw driver of the utility model.

Slidably be connected with slip lid 53 on the casing 1, slip lid 53 can drive connecting axle 51 and move axially.The edge of slip lid 53 is provided with guide rail 531, and corresponding casing 1 is provided with gathering sill 15, and slip lid 53 is installed in the gathering sill 15 and can slides vertically with respect to casing 1 by its guide rail 531.Certainly, also can be on the slip lid 53 gathering sill to be set, arrange on the casing 1 guide rail mode so that slip lid 53 move.

The cross section of a standard operation shank commonly used is orthohexagonal, it is the moment of torsion forced section that shank forms working head, and output shaft 4 has the accepting hole 41 that axially runs through, accepting hole 41 is arranged to the form of the hexagonal hole that the moment of torsion forced section with working head matches, installment work head makes working head be in the operating position in it, thereby realizes transfer of torque.Certainly, what working head also can the criteria of right and wrong, namely the cross section of moment of torsion forced section is polygonal shape, corresponding accepting hole is arranged to the polygon that matches with the moment of torsion forced section, can realize transfer of torque.Output shaft 4 is supported on by an axle sleeve 40 in the axial aperture 131 of fore shell 13, and axle sleeve 40 provides radial support for output shaft 4, can certainly realize by bearing the radial support of output shaft 4.Connecting axle 51 of the present utility model also is hexagon, be provided with hexagonal hole in the 3rd gear 303, be used for connecting with connecting axle 51 and rotary power being passed to connecting axle 51, connecting axle 51 inserts output shaft 4 and can drive output shaft 4 rotations like this, and then by 9 rotations of output shaft 4 drive working heads, working head 9 that like this can Application standard, and need not to offer the hole of accommodating working head 9 at connecting axle 51, the weight and volume of the excessive increase complete machine of connecting axle 51 diameters avoided.Like this, directly drive the output shaft that is of working head 9 rotations, shortened the distance of torque transfer, thereby the use of instrument is more reliable.The above-described mode that indirectly drives the working head rotation for connecting axle by output shaft, but, those skilled in the art are easy to expect that other transmission means substitutes, directly drive the working head rotation such as connecting axle, be but that connecting axle directly is connected with the mode of working head with transmitting torque, perhaps output shaft is driven by direct geared, get back to the storage folder and connecting axle only is used for releasing working head and drive working head, that is to say that driving-chain is motor-transmission mechanism-output shaft, namely connecting axle is not as the part of driving-chain.

With reference to Fig. 1, Fig. 2, Fig. 5 and shown in Figure 6, connecting axle 51 is six square shafts, on the connecting axle 51 axial restraint be provided with a fixed block 50, slip lid 53 can drive connecting axle 51 and move by the mode that links to each other with fixed block 50.The inside of slip lid 53 is provided with the first projection 535 and the second projection 536 along connecting axle 51 axially spaced-aparts, duty at electric screw driver, the first projection 535 has apart from S with fixed block 50 axially spaced-aparts, when slip lid 53 slides backward, namely slide towards the direction of motor 2, slided apart from after the S, the first projection 535 and fixed block 50 axial butts, it is axially mobile backward that thereby slip lid 53 drive fixed blocks 50 drive connecting axle 51 then, axially moves forward otherwise the second projection 536 drives connecting axles 51.In addition, electric screw driver need to axially be pressed on working head 9 on screw or the workpiece when operating, 9 of work can be subject to a reverse responsive to axial force like this, move behind the meeting generation connecting axle 51, at casing 1 limited block 81 that compressed by elasticity is set in the present embodiment, limited block 81 can with fixed block 50 butts and two positions of separating between move, to realize restriction and to allow the axially-movable of connecting axle 51.

Fixed block 50 is the shape of cubic hollow, connecting axle 51 has the support end 512 of connection fixing block 50, support end 512 is arranged to cylindrical, one side of fixed block 50 is provided with circular hole or U-shaped hole, support end 512 by circular hole, U-shaped hole is rotating is supported on the fixed block 50, thereby support end 512 extend into and on the hollow space of fixed block 50 annular groove can be set and can assemble back-up ring to carry out spacing to moving axially of connecting axle 51.The diameter of support end 512 is preferably less than connecting axle 51 6 sides' external diameter of a circle, thereby the volume that can reduce like this fixed block 50 makes the structure of instrument integral body compacter.Another side relative with circular hole or U-shaped hole and the end of support end 512 offset on the fixed block 50, wherein the end of support end 512 is arranged to coniform, connecting axle 51 is the some contact with contacting of fixed block 50 like this, because electric screw driver need to axially be pressed on working head 9 on the workpiece when operating, working head 9 can be subject to a reverse responsive to axial force like this, this axial force can pass to connecting axle 51, will produce larger stressed friction between connecting axle 51 and the fixed block 50, the mode of some contact can reduce friction, increases the service life of connecting axle 51.In addition, can make connecting axle 51 and fixed block 50 all adopt metal to make, reduce the degree of wear between connecting axle 51 and the fixed block 50.And fixed block 50 can be by the shape connection of a plurality of cubic hollows, to gain in strength, such as the preferred shape that adopts two or three cubic hollows in the present embodiment.The advantage that fixed block 50 can also have other is set, such as connecting axle 51 rotatable being supported on the fixed block 50, need not to use bearings, reduce volume and the cost of instrument; The sidepiece area of fixed block 50 is large, makes things convenient for limited block 81 and fixed block 50 to offset with to connecting axle 51 axial limitings, also makes things convenient for slip lid 53 to drive connecting axle 51 by the mode that offsets with fixed block 50 and moves; The hollow space of fixed block 50 also can play slip lid 53 and have an idle stroke (be slip lid 53 move and connecting axle 51 is thereupon mobile) with respect to connecting axle 51, a projection only need be set on the slip lid 53 so just can drive connecting axle 51 and move forward and backward, thereby make things convenient for slip lid 53 to operate limited blocks 81 so that connecting axle 51 is carried out the locking and unlocking.

In addition, those skilled in the art are easy to and can expect, if the driving-chain of powered screwdriver does not comprise connecting axle, namely output shaft is directly driven rotation by pinion gear mechanism, just have so relative rotation between working head and the connecting axle, friction be will inevitably produce, friction, the service life of tool for increasing also can be reduced as long as between working end that connecting axle arranges magnet and working head, be arranged to a form that contacts so.

Certainly, the mode that slip lid 53 drive connecting axles 51 move also has a lot, as can annular groove around week Monday outside it being set at connecting axle 51, slip lid 53 extend in the annular groove by a pin or steel wire ring and links to each other with connecting axle 51, so neither affect the rotation of connecting axle 51, also do not affect the movement that slip lid 53 drives connecting axle 51.The front end of connecting axle 51 is provided with magnet 511, be used for absorption working head 9, when selecting good berth head 9, can operate slip lid 53 drive connecting axles 51 and pass the working head supporting mechanism, working head 9 is connected magnet 511 absorption on the axle 51, and under the promotion of connecting axle 51, leave the working head supporting mechanism, enter output shaft 4.

Casing 1 comprises the fore shell 13 that is connected to its front end, and the part of working head supporting mechanism is housed in the fore shell 13, and another part is covered by slip lid 53 and exposes along with moving of slip lid 53.The preferred working head supporting mechanism of the utility model is storage cylindraceous folder 52, and convenient rotation takes up room little simultaneously, can certainly be arranged to square, leg-of-mutton, strip, the support shape etc.In electric screw driver work, slip lid 53 and fore shell 13 butts can all be closed storage folder 52 with connecting axle 51 like this.The position of corresponding connecting axle 51 is provided with the hole of passing for connecting axle 51 on the toothed wheel box cover plate 223, around connecting axle 51 Axis Extensions arched member 225 is arranged on the gear-box 22, arched member 225 can be wholely set with gear-box 22, also can divide and be arranged, can connecting axle 51 is partially enclosed by arched member 225 is set, electric screw driver change working head 9 the time, be that the position that slip lid 53 moves to rearmost end also can be exposed out connecting axle 51, can prevent like this inside of the entering tools such as dust, powder.And toothed wheel box cover plate 223 extends to the end face of arched member 225, thereby vertically with transmission mechanism 3 integrally closeds together.In the course of the work, slip lid 53 can be closed the storage folder, thereby prevent that dust from entering, when needs are changed working head, remove slip lid 53 and can expose storage folder 52, the different working head of convenient selection, so just need slip lid 53 to have certain length, when slip lid 53 moves to operating position with fore shell 13 butts, slip lid 53 and storage part B and driving section C axial overlap, when slip lid 53 moves to the position of replaceable working head, slip lid 53 and motor part D axial overlap, and overlapping with driving section C section axial.Certainly, the mode that slip lid 53 moves is a lot of in addition, such as slip lid 53 rotatable being installed on the casing 1, covering storage folder 52 and is exposing between two positions of storing folder 52 and rotate; Perhaps be similar to the mode of sliding door, can open or closure; Or the mode that is connected in casing 1 that pivots etc., will store folder 52 sealings in the time of can realizing work, will store folder 52 when needing to change working head and expose.

The top of fore shell 13 is provided with opened portion 133, the bottom of fore shell 13 is provided with the radial aperture 134 radially relative with opened portion 133, operation slip lid 53 moves to the direction of motor 2, connecting axle 51 also moves to along with slip lid 53 and stores folder 52 positions that separate, direct like this finger is just reached in the radial aperture 134 and can eject storage folder 52 and remove from opened portion 133, the storage folder that again another one is equipped with different working heads just can use from opened portion 133 casing of packing into.

Storage folder 52 rotatable being supported between toothed wheel box cover plate 223 and the output shaft 4, be evenly distributed with a plurality of working heads along its circumferencial direction on the storage folder 52 and accommodate storehouse 521, that is to say that working head has a plurality of receiving spaces, and a plurality of receiving space is set up in parallel along the rotation of storing folder 52.Working head is accommodated storehouse 521 along the 52 axial a part of sealings of storage folder, and a part of excircle opens wide, and can be easy to see from the part of opening wide the shape of working head 9 heads when the handled easily person selects working head 9 like this, thus the working head 9 that quick selection needs.Certainly, those skilled in the art are easy to expect, it also can be totally enclosed that working head is accommodated storehouse 521, only need identify in the position of correspondence, perhaps directly will stores to press from both sides 52 and make transparently, can conveniently identify.In addition, can between storage folder 52 and toothed wheel box cover plate 223, carry out the elasticity location, namely in the position that storage folder 52 is faced corresponding working head 9 on the end face of toothed wheel box cover plate 223 locating slot 522 is set, locating slot 522 is with to accommodate storehouse 521 corresponding, the steel cap that compressed by spring is set on the toothed wheel box cover plate 223, perhaps shell fragment, so, the storage folder whenever turns over a working head 9 steel caps or shell fragment all can send the voice prompt that falls into locating slot 522, thereby angle and the connecting axle 51 that can avoid when the operator selects working head 9 storing 52 folder rotations stagger.

In the work of needs electric screw driver, connecting axle 51 moves forward under the drive of slip lid 53, the working head that promotes to have selected enters output shaft 4, when needs are changed working head, connecting axle 51 retreats under the drive of slip lid 53, because the end that connecting axle 51 contacts with working head is provided with magnet 511, so can driving working head, connecting axle 51 gets back to accommodating in the storehouse 521 of working head storage folder.And if connecting axle 51 moves after continuing, can drive working head from accommodating in the storehouse 521 out, cause changing working head, if the operator does not find and during rotation storage folder, probably cause the damage of instrument.The utility model has proposed four kinds of solutions for addressing this problem, and below describes respectively.

With reference to Fig. 2 and Figure 10 to shown in Figure 12, the first embodiment that retreats along with connecting axle 51 for restriction working head 9.The end that storage folder 52 is faced gear-box 22 is provided with pressing plate 522, and pressing plate 522 can be along with storage folder 52 together rotation, and pressing plate 522 can press from both sides 52 integral type settings with storage, also can divide and be arranged, present embodiment is preferably and minute is arranged, both convenient processing, also easily assembling.The position that pressing plate 522 correspondences are accommodated storehouse 521 is provided with opening 523, be used for passing connecting axle 51, the end face that presss from both sides in the face of storage at opening 523 is provided with U-shaped groove 526, be used for accommodating U-shaped spring 56, U-shaped spring 56 has part and opening 523 when free state be overlapping, and the design of U-shaped groove 526 is reserved with the space to the strain of U-shaped spring 56.Because it is 6 that the utility model is preferably accommodated the quantity in storehouse 521, corresponding opening 523 quantity also are 6, the quantity of U-shaped groove 526 and U-shaped spring 56 is similarly 6, certainly those skilled in the art are easy to expect, opening 523, U-shaped groove 526 and U-shaped spring 56 also can only arrange one, be that pressing plate 522 is fixedly installed with respect to gear-box 22, what connecting axle 51 passed at every turn like this is same opening 523, can not affect rotation storage folder 52 to select working head.When connecting axle 51 retreated and move backward with working head under the effect of magnet 511, U-shaped spring 56 can strains be stuck on the connecting axle 51, and namely U-shaped spring 56 is in the primary importance (with reference to Figure 13) that allows connecting axle 51 motions.Because being connected the end of connecting axle 51 with working head, the end that connecting axle 51 connects working head all has chamfering or rounding, when the opening 523 of pressing plate 522 is left in the end that connecting axle 51 connects working head 9, U-shaped spring 56 is replied free state, the part of opening 522 is blocked, stopped by U-shaped spring 56 when working head 9 continues to retreat along with connecting axle 51, namely U-shaped spring 56 is in the second place (with reference to Figure 14) that restraint of labour head 9 retreats.Connecting axle 51 separates with working head 9 like this, can rotate arbitrarily storage folder another working head 9 need to select.In powered screwdriver work, in order to prevent that U-shaped spring 56 rotations to connecting axle 51 from causing resistance, can be on connecting axle 51 axially the position of corresponding U-shaped spring 56 annular groove 512 around 51 1 weeks of connecting axle is set, U-shaped like this spring 56 can not cause resistance to the rotation of connecting axle 51, and simultaneously U-shaped spring 56 has been realized working head led and got back in the storage folder 52.

With reference to Figure 13 to shown in Figure 15, the second embodiment that retreats along with connecting axle 51 for restriction working head 9.Be fixed with a shell fragment 57 on the toothed wheel box cover plate 223, shell fragment 57 is arranged between storage folder 52 and the toothed wheel box cover plate 223, shell fragment 57 is provided with at least one elasticated end 571, elasticated end 571 parts stretch in the hole on the toothed wheel box cover plate 223, pass through like this strain of elasticated end 571, also can realize blocking working head 9, prevent from driving when connecting axle 51 from retreating working head 9 and leave storage folder 52.With reference to Figure 14, elasticated end 571 is in the primary importance that allows connecting axle 51 motions; With reference to Figure 15, elasticated end 571 is in the second place that restraint of labour head 9 retreats.According to present embodiment, those skilled in the art are easy to expect, can directly elasticated end 571 be stuck on the toothed wheel box cover plate 223, the stator of rigidity perhaps is set, stator can be by elastic reaction in the hole on the partial occlusion toothed wheel box cover plate 223 with leave between two positions, hole on the toothed wheel box cover plate 223 and move, thereby realizes the separation between working head 9 and the connecting axle 51 and working head 9 led get back to storage folder 52.

With reference to shown in Figure 16, the third embodiment that retreats along with connecting axle for limiting working head.The position of corresponding connecting axle 51 is provided with perforation 2231 on the toothed wheel box cover plate 223, toothed wheel box cover plate 223 and storage are pressed from both sides 52 adjacent end faces and are provided with step projection 2232, step projection 2232 is accommodated storehouse 521 settings around pivot and the correspondence of storage folder 52, step projection 2232 disconnects at perforation 2231 places, and the part that is positioned at the perforation both sides on the step projection 2232 arranges spigot surface 2233, spigot surface 2233 increases progressively from the 2231 place's height of boring a hole on the direction of working head along with the rotation of storage folder, that is to say that spigot surface 2233 increases progressively to the both sides height from 2231 places of boring a hole, so just formed two spigot surfaces, no matter store the folder 52 forwards or the counter-rotating can lead to the position of working head.

With reference to shown in Figure 17, the 4th kind of embodiment that retreats along with connecting axle for limiting working head.Spigot surface 2233a directly is arranged on the end face of toothed wheel box cover plate 223, spigot surface 2233a arranges around

perforation

2231,2231 places outwards highly increase progressively from perforation, form like this spigot surface 2233a of an annular, not only be beneficial to processing but also can guarantee to store when pressing from both sides rotating and can both lead to the position of working head.

The aforesaid the 3rd, mask work head and connecting axle 51 and working head 9 led back storage folder at 52 o'clock in the 4th embodiment, the spigot surface role is identical, take the 3rd embodiment as example, spigot surface 2233 concrete action principles arrive shown in Figure 20 with reference to Figure 18, when needs are changed working head, operation slip lid 53 drives connecting axle 51 and moves to connecting axle 51 along axially separating (namely axially not overlapping) with storage folder 52, working head still engages with connecting axle 51 under the suction of magnet 511 on the connecting axle 51 and has part to exceed the end face of storage folder 52, rotation storage folder 52, working head be subjected to displacement along with storage folder 52 and with spigot surface 2233 butts, continue like this rotation storage folder 52, working head 9 will be concordant with the end face of storage folder 52 to the end face of working head 9 in the effect lower slider of spigot surface 2233, can not have influence on the rotation of storage folder 52.

Although, if set the stroke of connecting axle 51 motions and the dimensional accuracy of storage folder 52 and tool interior structure, assembly precision, connecting axle 51 can only drive the end face position concordant with the end face of storage folder 52 that working head 9 moves to working head, also can rotate normally storage folder 52, but like this machining accuracy and the assembly precision of parts there is very high requirement, certainly will increase the cost of electric screw driver, and along with constantly friction in using, size between the parts produces error, can occur still that working head 9 blocks storage folder 52 or connecting axle 51 blocks storage folder 52 and cause storage folder 52 normally to rotate.Also can think be subjected to the accuracy of manufacture, rock the gap, the impact of the composite factor such as material, working head and toothed wheel box cover plate 223, connecting axle 51 may be interfered in rotary course with storage folder 52.Can leave very large leeway to the movement of connecting axle 51 by spigot surface is set, thereby improve the geometry that cooperates the place, position, eliminate the possibility that each materials and parts are interfered in storage folder 52 rotary courses.So do not need very high manufacturing and assembly precision, just can reduce greatly cost, thereby and storage press from both sides 52 and be not easy to be stuck and can increase the service life of instrument.

According to the motion principle between working head 9 and the spigot surface 2233, spigot surface 2233 can be the inclined-plane, curvilinear plane, arcwall face etc., preferred inclined-plane in the present embodiment, the inclined-plane is α with respect to the angle of inclination of storage folder 52 end faces, the leeway that connecting axle 51 moves is roughly chamfer length and multiply by sin α, therefore the leeway that the larger connecting axle 51 of angle [alpha] moves is just larger accordingly, simultaneously rotation storage folder 52 moves the power that needs with driving working head 9 along the inclined-plane also just larger, in order to make between the two relatively balance, the tilt angle alpha on preferred inclined-plane is between 10 degree-30 degree, rotation storage folder 52 neither needs the strength that costs a lot of money like this, guarantees that simultaneously connecting axle 51 has enough mobile leeway.

Above-mentioned definition to each element is not limited in various concrete structures or the shape of mentioning in the embodiment, and those of ordinary skill in the art can replace simply to it with knowing.Can come instead of electr ic motor with gasoline engine or diesel engine etc. such as motor; Working head can be that the cross section is regular arbitrarily polygon; In addition, in the above-mentioned embodiment, moving to axial between connecting axle and the working head storage folder also can be that connecting axle is fixed, and working head storage folder can either also can rotate in axially-movable, and connecting axle also can be and the coaxial setting of motor shaft, and to its structure and have no special requirements, visual different interior comes corresponding change configuration, new element can be increased, also unnecessary element can be reduced.

Claims

1. power tool comprises:

Casing;

Motor is arranged in the casing, and outputting rotary power;

Output shaft has the accepting hole that holds working head of axial setting;

Transmission mechanism is arranged between motor and the output shaft and also the rotary power of motor output can be passed to output shaft;

The working head supporting mechanism, be arranged in the casing, described working head supporting mechanism has several receiving spaces that are set up in parallel for the support works head, and described working head supporting mechanism can be adjusted to one of them receiving space and the axial corresponding position of output shaft;

Connecting axle is arranged in the casing, and described connecting axle can move between two positions, and in primary importance, described connecting axle and working head connect and make working head to be in the operating position that is positioned at accepting hole; In the second place, described connecting axle working head is in be positioned at the working head supporting mechanism collecting position and can with the working head axial separation;

It is characterized in that: described power tool also comprises the return device of leading in abutting connection with the setting of working head supporting mechanism, described connecting axle moves to the second place from primary importance, described working head under the effect of leading return device with the connecting axle axial separation and remain on collecting position.

2. power tool as claimed in claim 1, it is characterized in that: the described return device of leading comprises the supporting surface that contacts with the working head supporting mechanism and the spigot surface that links to each other with supporting surface, and described working head supporting mechanism position adjustment can drive the working head that engages with connecting axle and separate with connecting axle under the effect of spigot surface.

3. power tool as claimed in claim 2, it is characterized in that: described working head supporting mechanism and transmission mechanism are provided with cover plate, and described supporting surface and spigot surface are arranged on the cover plate.

4. power tool as claimed in claim 3 is characterized in that: be provided with the step projection along working head along with the movement locus of working head supporting mechanism position adjustment on the described cover plate, described supporting surface and spigot surface are arranged on the step projection.

5. power tool as claimed in claim 3, it is characterized in that: the position of corresponding connecting axle is provided with perforation on the described cover plate, and described spigot surface outwards highly increases progressively from perforation place.

6. power tool as claimed in claim 5, it is characterized in that: described spigot surface is provided with two, and two spigot surfaces are positioned at working head along with on the movement locus of working head supporting mechanism position adjustment and be distributed in the perforation both sides.

7. power tool as claimed in claim 5 is characterized in that: described spigot surface is around arranging in a week of described perforation.

8. power tool as claimed in claim 2, it is characterized in that: described spigot surface is the inclined-plane.

9. power tool as claimed in claim 8 is characterized in that: described inclined-plane with respect to the angle of inclination of storage folder end face at 10 degree between 30 degree.

10. power tool as claimed in claim 2, it is characterized in that: described working head supporting mechanism is rotatable to be supported between casing and the described cover plate.