CN101758270B

CN101758270B - Electric tool

Info

Publication number: CN101758270B
Application number: CN2009100066525A
Authority: CN
Inventors: 张士松; 顾育明
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Jiangsu Lipu Electronics Co Ltd
Priority date: 2008-11-28
Filing date: 2009-02-06
Publication date: 2012-02-01
Anticipated expiration: 2029-02-06
Also published as: CN101758270A

Abstract

The invention discloses an electric tool which comprises a casing, a motor, an output shaft and a clamping head, wherein the motor is contained in the casing; the output shaft is driven by the motor to rotate; and the clamping head is connected with the output shaft and a cutting tool. The casing is provided with an impact ring, a circular ring and a speed reducing shaft, wherein the impact ring can axially move and can not rotate in circumference; the circular ring can rotate, and is provided with an inner tooth ring; the speed reducing shaft is provided with a large gear and a small gear; the speed reducing shaft is parallel to the output shaft of the motor; the output shaft of the motor can be sleeved with a guide sleeve which can be axially moved to disconnect or connect with the clamping head; the guide sleeve is provided with an outer tooth ring which is engaged with the large gear of the speed reducing shaft; the small gear of the speed reducing shaft is engaged with the inner tooth ring of the circular ring; and the opposite end surfaces of the impact ring and the circular ring are respectively provided with impact teeth which can perform impact. A spring is arranged between the impact ring and the casing, one end of which is connected with the casing, and the other end of which is connected with the impact ring. The cutting tool provided by the invention can be conveniently and quickly disassembled and assembled.

Description

Electric tool

Technical field

The present invention relates to a kind of electric tool, particularly a kind of electric tool with rotary cutter.

Background technology

Thereby electric tools such as bakelite mills, electric drill normally drive the cutter rotation by the rotation of motor-driven output shaft and cut; Work such as boring; But cutter is easy to wearing and tearing and needs to change cutter in long-term use; And in operating process, also often need to change the cutter of various different sizes, but be to use the process of the instrument dismounting cutter of spanner or similar functions not only to require great effort but also consuming time, exist instrument such as spanner problem such as to lose easily simultaneously again.BP GB 2351461A has disclosed a kind of bakelite and has milled bevel gear all is set on output shaft and chuck; Mesh simultaneously through the bevel gear and the bevel gear on output shaft and the chuck that are arranged on the casing; Manually rotation casing epicone gear makes the bevel gear on output shaft and the chuck rotate round about; Thereby chuck is unclamped from output shaft, and the structure that cutter is changed is though this dismounting tool structures has solved the problem that instrument is lost; Unclamp until chuck but need the operator to rotate casing epicone gear always, not only require great effort but also consuming time.And Chinese patent CN 2376354Y has disclosed a kind of impact self-locking chuck structure of drill gun, can hit chuck through the motor rotation of drill gun, makes chuck to the cutter auto lock; Yet; This structure needs the operator when chuck is hit in the drill gun rotation, holds the not transfer of chuck case, effort very; And the only suitable lower electric tool of rotating speed of this impact self-locking chuck structure, the scope of application is also very limited.

Summary of the invention

Technical problem to be solved by this invention provides a kind of electric tool simple in structure, easy to use, can realize unclamping and clamping of chuck automatically, makes that the cutter disassembly process is not only laborsaving but also quick, has improved efficient.

Technical scheme of the present invention is: a kind of electric tool; Comprise casing, be housed in the motor in the said casing, by the output shaft of said motor-driven rotation and the chuck that connects said output shaft and cutter; The impact ring that circumferentially can not rotate but said casing is provided with axially-movable; The annulus of rotating band ring gear and with the deboost axle of big pinion, said deboost axle and said motor output shaft axially parallel are provided with, said motor output shaft be socketed with can move axially the guide pin bushing that breaks away from or be connected with said chuck; Said guide pin bushing is provided with external toothing and the engagement of said deboost axle gear wheel; The ring gear engagement of said deboost axle pinion and said annulus, said impact ring and said annulus opposing end surface are respectively arranged with the impact teeth that can impact, also are provided with spring between said impact ring and the said casing; One end of said spring is connected with said casing, and the other end is connected with said impact ring.

Further technical scheme of the present invention is: a regulating sleeve is socketed on the said output shaft; Be connected rotationally with said casing; Also be provided with a support set between said regulating sleeve and the said guide pin bushing, said regulating sleeve and said support set opposite face are respectively arranged with convexity and the groove that can accommodate said convexity.

Electric tool of the present invention has effectively utilized motor-driven power owing to adopted the deceleration impact structure, and the rotating speed of the relative motor output shaft of annulus rotary speed of feasible band impact teeth reduces greatly; Thereby reduced the number of times that impacts; Form relatively reasonably impact velocity and dynamics, give chuck and clamping or unclamping the hitting power on the direction, make chuck oneself unclamp or clamp; Thereby quickly and easily cutter is carried out dismounting, be applicable to the electric tool of various high speeds more widely.

Electric tool of the present invention makes electric tool of the present invention to change cutter and normal duty switching automatic the impact like a cork owing to further adopted regulating sleeve.Electric tool of the present invention also has characteristics simple in structure, that cost is low, easy to use simultaneously.

Description of drawings

Below in conjunction with accompanying drawing and concrete embodiment the present invention is further specified.

Fig. 1 is the structural representation that preferred embodiment bakelite of the present invention mills;

Fig. 2 is the partial 3-D three-dimensional exploded view that bakelite shown in Figure 1 mills;

Fig. 3 is the three-dimensional structure diagram that preferred embodiment bakelite of the present invention mills support set;

Fig. 4 is the three-dimensional structure diagram that preferred embodiment bakelite of the present invention mills regulating sleeve;

Fig. 5 is the partial enlarged drawing that preferred embodiment bakelite of the present invention shown in the A portion mills impact structure among Fig. 1, and wherein guide pin bushing and chuck are in a disengaged position;

Fig. 6 is that preferred embodiment bakelite of the present invention shown in Figure 5 mills the structural representation of impact structure when guide pin bushing and chuck are in link position;

Wherein:

10 pedestals, 11 guide pillars, 12 casings,

13 from cyclone, 14 motors, 15 bearings,

16 output shafts, 17 bearings, 18 cutters,

19 percussion mechanisms, 20 chucks, 21 extensions,

22 guide grooves, 23 springs, 24 impact ring,

26 radial projection, 28 first impact teeth, 29 reducing gears,

30 ring gears, 31 annulus, 32 second impact teeth,

34 shell end covers, 35 centre bores, 43 annular extensions,

48 guide grooves, 45 draw-in grooves, 37 deboost axles,

36 gear wheels, 38 pinions, 40 guide pin bushings,

41 bearings, 42 radial projection, 44 external toothings,

46 polygonal hole, 50 support sets, 52 direction protrusions,

54 grooves, 56 wear-resisting circles, 39 springs,

60 regulating sleeves, 61 centre bores, 63 flanges,

62 elastic springs, 64 convexities, 66 gear springs,

68 external screw threads, 69 taper holes, 70 nuts,

72 awl clamps, 74 axial holes, 76 grooves,

78 grooves, 80 cannelures, 82 elastic springs,

The specific embodiment

With reference to shown in Figure 1; Preferred embodiment bakelite of the present invention mills and comprises horizontal base 10, by the guide pillar 11 that pedestal 10 extends vertically upward, and removable casing 12, casing 12 inner hollow that are socketed on the guide pillar 11; Contain a vertical motor 14 of placing; The two ends of motor 14 are supported on the casing 12 through

bearing

15 and 17 respectively, and the output shaft 16 of motor 14 stretches out casing 12 downwards, are connected output shaft 16 with one and are connected with the polygon chuck 20 of cutter 18; Be provided with between casing and the chuck from cyclone 13, comprise the percussion mechanism 19 that utilizes motor-driven power that chuck is impacted from cyclone 13.Percussion mechanism 19 comprises impact ring 24, annulus 31, and shell end cover 34 and reducing gear 29, reducing gear 29 comprises ring gear 30, deboost axle 37, guide pin bushing 40, support set 50, spring 39 (seeing Fig. 2 or Fig. 5) and regulating sleeve 60.What mention in this specification is up and down to be horizontal plane with the base plane, about on the base plane direction, also be on the electrical axis direction about, as coordinate, other are analogized.

With reference to shown in Figure 2, casing 12 lower ends are provided with to the extension that extends below 21, the excircle of extension 21 be provided with along motor shaft to guide groove 22.

One impacts ring 24 inner rings is provided with the radial projection 26 that is housed in movably in the guide groove 22; The lower surface of impacting ring 24 also is provided with first impact teeth 28; Wherein impact between ring 24 and the casing 12 and also be provided with a plurality of springs 23; Make to impact ring 24 in that receive when impacting can axially-movable, spring 23 end when mounted is resisted against the upper surface of impacting ring 24, and the other end is resisted against on the lower surface of casing 12.

The annulus 31 of one band ring gear 30, its upper surface is provided with second impact teeth 32, is housed in rotationally in the shell end cover 34.

Shell end cover 34 is an inner hollow; It is cylindric that the upper end open lower is sealed, and the bottom is provided with centre bore 35, and its bottom lower surface also is provided with to the annular extension 43 that extends below; Extension 43 inside diameters are greater than the diameter of centre bore 35; Extension 43 internal perisporiums are provided with axially extended guide groove 48, and periphery wall is provided with draw-in groove 45, and shell end cover 34 can be fixedly connected through connectors such as bolts with casing 12.

34 of casing 12 and shell end covers also are provided with the deboost axle 37 that laterally arranges with motor output shaft 16; Deboost axle 37 two ends are connected through the rotating bottom with casing 12 lower surfaces and shell end cover 34 of bearing; Be socketed with gear wheel 36 and pinion 38 on the deboost axle 37; Certainly, gear wheel 36 also can be wholely set with deboost axle 37 with pinion 38, and wherein pinion 38 meshes with the ring gear 30 of annulus 31.

One annular guide pin bushing 40 through one in axial sliding bearing 41 be socketed on the motor output shaft 16; The middle part of guide pin bushing 40 outer circumference surfaces is provided with radial projection 42; The top of guide pin bushing 40 outer circumference surfaces is provided with external toothing 44 and can meshes with the gear wheel 36 on the deboost axle 37, and the bottom of guide pin bushing 40 inner peripheral surfaces is set to accommodate the polygonal hole 46 of chuck 20.

One annular brace cover 50 is socketed on the output shaft 16, and its outer surface is provided with the radially-directed projection 52 that is housed in the axial channel 48, and support set 50 inner surfaces are provided with the recessed groove 54 that makes progress from the lower surface, and are as shown in Figure 3.Support set 50 upper surfaces lean through the lower surface of a wear-resisting circle 56 with radial projection 42, and wear-resisting circle 56 can reduce the hard friction damage between support set 50 and the radial projection 42, thereby prolong the service life of support set 50 and guide pin bushing 40.

One spring 39 is socketed in guide pin bushing 40 tops, and spring 39 1 ends are resisted against shell end cover 34 bottom lower surfaces, and the other end is resisted against the upper surface of radial projection 42, makes guide pin bushing 40 remain with support set 50 and contacts.

One inner hollow; The cylindric regulating sleeve 60 of upper end open lower sealing; Its bottom is provided with centre bore 61, along the excircle of regulating sleeve 60 upper ends one flange 63 is set, and is connected with shell end cover 34 rotationally through an elastic spring 62; The upper surface, bottom of regulating sleeve 60 is provided with the convexity 64 in the groove 54 that can be housed in support set 50 along centre bore 61 circumferencial directions, as shown in Figure 4.

One gear spring 66 is arranged between regulating sleeve 60 and the shell end cover 34; Gear spring 66 is a middle reed that arches upward; The portion of arching upward is resisted against on regulating sleeve 60 internal perisporiums wherein; Two legs of gear spring 66 are resisted against in the draw-in groove 45 of extension 43 periphery walls of shell end cover 34, and regulating sleeve 60 and shell end cover 34 positions are kept stable.

The centre bore 61 of regulating sleeve 60 is stretched out in the lower end of output shaft 16, and its outer surface is provided with external screw thread 68, and the place, axle center is provided with up-small and down-big taper hole 69.

Chuck 20 comprises tapped nut 70 and up-small and down-big awl clamp 72.Nut 70 is a gengon, like positive five limits or hexahedron.Bore clamp 72 and be provided with the axial hole 74 that can accommodate cutter, the perisporium upper and lower side of awl clamp 72 is offered the equally distributed a plurality of grooves 76 and 78 that stagger each other respectively, and awl clamp 72 big ends are provided with cannelure 80 can pass through an elastic spring 82 clampings with nut 70.When chuck 20 of the present invention connected with output shaft 16, the male cone (strobilus masculinus) of awl clamp 72 inserted in the taper hole 69 of output shaft 16, and nut 70 internal threads are threaded with output shaft 16 external screw threads 68.

Referring to shown in Figure 5; Bakelite of the present invention mills when mounting cutter; Earlier cutter 18 is inserted in the axial hole 74 of chuck 20; Rotate nut 70 then and tighten, the male cone (strobilus masculinus) that drives awl clamp 72 upwards inserts in the taper hole 69 of output shaft 16, thereby 72 distortion of taper hole 69 crush cones clamps give cutter certain pretightning force.At this moment, the operator just can overcome the manual rotary regulating sleeve 60 of elastic force of gear spring 66 (see figure 2)s, when the bottom protrusion 64 of regulating sleeve 60 is alignd with the groove 54 of support set 50; Support set 50 axially moves down, and groove 54 is socketed on the bottom protrusion 64 of regulating sleeve 60, at this moment; Guide pin bushing 40 also axially moves down thereupon; The polygonal hole 46 of guide pin bushing 40 bottoms is docked with chuck 20, and is as shown in Figure 6, thereby makes guide pin bushing 40 keep relative rotational fixation to be connected with the nut 70 of chuck 20.Start motor 14, motor output shaft 16 rotates, and drives chuck 20 and rotates; Chuck 20 drives guide pin bushing 40 then and rotates; The gear wheel 36 that guide pin bushing external toothing 44 drives deboost axle 37 rotates, and also promptly drives deboost axle pinion 38 and rotates, and the annulus 31 that deboost axle pinion 38 drives band ring gear 30 then rotates; Because impacting ring 24 circumferentially can not rotate; And can only be in axially-movable, when annulus 31 rotated, second impact teeth 32 of impacting 28 pairs of annulus 31 of first impact teeth of ring 24 lower ends gave the impulsive force opposite with its direction of rotation; Self also upwards move and annulus 31 disengagings and impact ring 24 at the impact force action lower shaft; Then second impact teeth 32 of annulus 31 is impacted to moving down continuation at the elastic force effect lower shaft of spring 23 again, impulsive force makes and produces speed difference between nut 70 and the output shaft 16 of chuck 20, thereby output shaft 16 axially moves upward relatively; The male cone (strobilus masculinus) that drives awl clamp 72 upwards further inserts in the taper hole 69 of output shaft 16, thereby taper hole 69 further crush cones clamp 72 distortion clamp cutter.When work, the manual rotary regulating sleeve 60 of operator, the base projections 64 of regulating sleeve 60 makes guide pin bushing 40 break away from chuck 20 support set 50 jack-up, gets back to state shown in Figure 5, bakelite mills and can carry out milling work.

Bakelite of the present invention mills when the dismounting cutter; The operator overcomes the manual rotary regulating sleeve 60 of elastic force of gear spring 66, makes support set 50 axially move down, and groove 54 is socketed on the base projections 64 of regulating sleeve 60; At this moment; Guide pin bushing 40 also axially moves down thereupon, and the polygonal hole 46 of its underpart is docked with chuck 20, thereby makes guide pin bushing 40 keep relative rotational fixation to be connected with the nut 70 of chuck 20.Start motor 14 and rotate round about, motor output shaft 16 rotates, and drives chuck 20 and rotates; Chuck 20 drives guide pin bushing 40 then and rotates, and guide pin bushing external toothing 44 drives deboost axle gear wheel 36 and rotates, and also promptly drives deboost axle pinion 38 and rotates; The annulus 31 that deboost axle pinion 38 drives ring gear 30 then rotates, circumferentially can not rotate owing to impact ring 24, and can only be in axially-movable; When annulus 31 rotates; Second impact teeth 32 of impacting 28 pairs of annulus 31 of first impact teeth of ring 24 lower ends gives the impulsive force opposite with its direction of rotation, also upwards moves and annulus 31 breaks away from the impact force action lower shaft and impact ring 24 self, then second impact teeth 32 of annulus 31 is impacted to moving down continuation at the elastic force effect lower shaft of spring 23 again; Impulsive force makes and produces speed difference between nut 70 and the output shaft 16 of chuck 20; Thereby output shaft 16 axial downward movement drive the male cone (strobilus masculinus) of boring clamp 72 and move downward the taper hole 69 that breaks away from output shaft 16 gradually relatively, thereby unclamp awl clamp 72; Cutter unclamps the most at last, and the operator can easily carry out the replacing of cutter.

Claims

1. electric tool; Comprise casing, be housed in the motor in the said casing, by the output shaft of said motor-driven rotation and the chuck that connects said output shaft and cutter; It is characterized in that: the impact ring that circumferentially can not rotate but said casing is provided with axially-movable; The annulus of rotating band ring gear and with the deboost axle of big pinion, said deboost axle and said motor output shaft axially parallel are provided with, said motor output shaft be socketed with can move axially the guide pin bushing that breaks away from or be connected with said chuck; Said guide pin bushing is provided with external toothing and the engagement of said deboost axle gear wheel; The ring gear engagement of said deboost axle pinion and said annulus, said impact ring and said annulus opposing end surface are respectively arranged with the impact teeth that can impact, also are provided with spring between said impact ring and the said casing; One end of said spring is connected with said casing, and the other end is connected with said impact ring.

2. electric tool according to claim 1; It is characterized in that: a regulating sleeve is socketed on the said output shaft; Be connected rotationally with said casing; Also be provided with a support set between said regulating sleeve and the said guide pin bushing, said regulating sleeve and said support set opposite face are respectively arranged with convexity and the groove that can accommodate said convexity.

3. electric tool according to claim 2 is characterized in that: also be provided with the gear spring between said regulating sleeve and the said casing.

4. electric tool according to claim 2 is characterized in that: be provided with wear-resisting circle between said support set and the said guide pin bushing.

5. electric tool according to claim 1 is characterized in that: said chuck is a gengon, and said guide pin bushing is provided with the polygon hole that can accommodate said chuck.

6. electric tool according to claim 1; It is characterized in that: the lower end outer surface of said output shaft is provided with external screw thread, and the place, axle center is provided with up-small and down-big taper hole, and said chuck comprises tapped nut and up-small and down-big awl clamp; Said awl clamp is provided with the axial hole that can accommodate cutter; When said chuck and said output shaft connected, the male cone (strobilus masculinus) of said awl clamp inserted in the taper hole of said output shaft, and said nut is threaded with said output shaft.

7. electric tool according to claim 6 is characterized in that: the perisporium upper and lower side of said awl clamp is offered the equally distributed a plurality of grooves that stagger each other respectively.

8. electric tool according to claim 6 is characterized in that: the big end of said awl clamp is connected through an elastic spring with said nut.