CN205237922U - Impact tool - Google Patents

Abstract

The utility model discloses a simple structure improves the fastening ability, and can not lead to maximization, the weightization of product. The utility model relates to an impact tool. Impact wrench (1) possesses: brushless motor (8), main shaft (69) that rotate through brushless motor's (8) drive, and can accompany the rotation of main shaft (69) and apply beater mechanism (10) of rotatory impact force to anvil (4), supply with hole (92) along radially being formed with the lubricating grease of supplying with lubricating grease between axle bush (88) of carrying out the axle suspension to the anvil and to anvil (4) in anvil (4), form constriction part (96) in the position different with formation position lubricating grease supply hole (92) anvil (4), this constriction part (96) make for torsional section modulus than lubricating grease supply with hole (92) thus the big torsion of the messenger grow of this section modulus at formation position.

Description

Percussion tool

Technical field

The utility model relates to impact and revolves the percussion tool such as tool, impact wrench.

Background technology

Impact is revolved the percussion tools such as tool and is possessed beater mechanism, and this beater mechanism comprises and is accompanied by motorDrive and main shaft, the hammer of being combined with spindle cam and the spiral bullet to the hammer application of force of rotationSpring, makes hammer engage with the anvil that becomes final output shaft, if the moment of torsion of anvil increases, passes throughBeater mechanism make the rotation of main shaft be converted to hammer intermittence rotary impact power (impact) and canPut on anvil (for example, with reference to patent documentation 1).

Patent documentation 1: TOHKEMY 2014-167926 communique

In above-mentioned percussion tool in the past, in order to increase fastening ability, need to make hammer maximize,Or make rotating speed increase etc. with exporting large motor, therefore cause maximization, the weight of product,Thereby make cost increase, and the convenience using degenerate.

Utility model content

Therefore, the purpose of this utility model is to provide by simple structure and just can makes fastening energyPower improves, and does not cause the maximization of product, the percussion tool of weight.

To achieve these goals, the utility model that technical scheme 1 is recorded is a kind of percussion tool,It possesses: motor; Main shaft, its driving by motor is rotated; And beater mechanism, its energyEnough be accompanied by the rotation of main shaft and final output shaft is applied to rotary impact power, and at final output shaftInside radially form the oil to supplying with lubricating grease between final output shaft and the bearing of final output shaftFeed path, above-mentioned percussion tool is characterised in that, final output shaft with oily feed pathDifferent position, forming part forms torsional deflection portion, and this torsional deflection portion makes in following formula relativeLarger than this section modulus of the forming part of oily feed path in the section modulus reversing.

ω＝(32/πd⁴)×(T/G)

ω: the torsion angle of unit length, d: diameter, T: moment of torsion, G: transverse elasticity coefficient

(32/πd⁴): with respect to the section modulus (inverse of section polar moment of inertia) reversing

To achieve these goals, the utility model that technical scheme 2 is recorded is a kind of percussion tool,It possesses: motor; Main shaft, its driving by motor is rotated; And beater mechanism, its energyEnough be accompanied by the rotation of main shaft and final output shaft is applied to rotary impact power, and at final output shaftFront end the installation portion of front end tool is set, the position shape different from installation portion of final output shaftBecome torsional deflection portion, this torsional deflection portion makes to become with respect to the section modulus reversing in following formulaThe more than 2 times of this section modulus of installation portion.

ω＝(32/πd⁴)×(T/G)

ω: the torsion angle of unit length, d: diameter, T: moment of torsion, G: transverse elasticity coefficient

(32/πd⁴): with respect to the section modulus (inverse of section polar moment of inertia) reversing

On the basis of the structure of technical scheme 1 or 2, the utility model that technical scheme 3 is recordedBe characterised in that, torsional deflection portion spreads all over the complete cycle of final output shaft and the contraction flow region that forms.

According to the utility model, by the formation of torsional deflection portion, can carry by simple structureHigh fastening ability and do not make hammer maximize, is not used the large motor of output yet. Therefore, by steelThe plate each other situation of bolted is inferior, in the anglec of rotation of impacting each time very hour effectively.On the other hand, if identical fastening ability can be used less hammer, export little motor,Therefore make miniaturization, the lightness of product.

The utility model of recording according to technical scheme 3, at the base of the effect of technical scheme 1 or 2On plinth, by using torsional deflection portion as contraction flow region, can form simply desirable torsion and becomeShape portion.

Brief description of the drawings

Fig. 1 is the side view of impact wrench.

Fig. 2 is the front view of impact wrench.

Fig. 3 is the longitudinal section of impact wrench.

Fig. 4 is the cutaway view along the A-A line of Fig. 3.

Fig. 5 is the stereogram of observing stator from rear.

Fig. 6 A, Fig. 6 B, Fig. 6 C, Fig. 6 D are the key diagrams of anvil, and Fig. 6 A is front view,Fig. 6 B is rearview, and Fig. 6 C illustrates local side view by section, and Fig. 6 D is top view.

The explanation of Reference numeral

1... impact wrench; 2... main body; 3... handle; 4... anvil; 5... installation portion; 6... battery pack;7... main body cover; 8... brushless motor; 9... hammer housing; 10... beater mechanism; 30... stator;31... rotor; 36... sensor electrical base board; 37... short-circuit part; 57... rotating shaft; 69... main shaft;70... planet carrier portion; 71... planetary gear; 77... hammer; 78... ball; 79... helical spring; 80...Pawl; 81... arm; 90... lubricating grease storage part; 92... lubricating grease supply hole; 94... installation portion; 95...Sleeve; 96... contraction flow region.

Detailed description of the invention

Below, based on accompanying drawing, embodiment of the present utility model is described.

Fig. 1 is the side view as the impact wrench of an example of percussion tool, and Fig. 2 is main lookingFigure, Fig. 3 is longitudinal section. For this impact wrench 1, in the main body of extending along fore-and-aft direction2 have the side that handle 3 is formed downwards looks T word shape, the anvil 4 that becomes final output shaft fromThe front end of main body 2 is outstanding, is provided with as power supply at the installation portion 5 of the lower end that is arranged at handle 3Battery pack 6. The 95th, be installed on the sleeve of the front end of anvil 4.

The shell of main body 2 is by making handle 3 extend setting in the rear part of storage brushless motor 8Plastic main body cover 7 and be assembled in the front of main body cover 7 and receive beater mechanism10 metal hammer housing 9 forms. Screw 11 by left and right directions of main body cover 7,11 ... pair of right and left is split to shell 7a, 7b assembling and form.

At the rear of the interior hammer housing 9 of main body cover 7, the gold chimeric with the rear end of hammer housing 9The gear casing 12 that belongs to system and become towards the rear convex as shown in Figure 4, by respectively split shell 7a,Maintenance rib 7c, the 7c that the inner face of 7b arranges highlightedly keeps. Make to be arranged at this gear casing 12The rib 13 of periphery be positioned at rear boss 7A, 7A ... with front boss 9A, 9A ... between shapeUnder state, by the bolt 14,14 of multiple (four herein) ... from rear combination, thereby will leadBody case 7 and gear casing 12, hammer housing 9 are integrated, wherein rear boss 7A, 7A ... withBe positioned at the main mode depending on the bight that is quadrangle shape establishes highlightedly in the front end outside of main body cover 7Put front boss 9A, 9A ... similarly be positioned at main depending on being with the outside, rear end at hammer housing 9The mode in the bight of quadrangle shape arranges highlightedly. Twist with respect to metal hammer housing 9 like thisEnter bolt 14, thereby main body cover 7 is firmly combined with hammer housing 9, durability also improves.In addition, main body cover 7 forms by splitting shell 7a, 7b, therefore easily connects up.

Be provided with the switch 15 and the motor that make trigger 16 outstanding towards front on the top of handle 3Positive and negative switching push button 17. Above trigger 16 and at main body cover 7, be formed with coveringThe lower surface of hammer housing 9 and than trigger 16 the outstanding extension setting unit 18 towards front more,About front end of extending setting unit 18 be provided with LED19 that the front of anvil 4 is irradiated,19. Two LED19 are set like this, large thereby range of exposures becomes, at anvil 4, larger cover is installedCylinder 95 also can carry out the illumination of job position without barrier.

On the other hand, installation portion 5 is accommodated with control circuit substrate 20, this control circuit substrate 20Be held in the housing 21 of plate-like and carried the switch element, miniature of the control use of brushless motor 8Computer etc. Be provided with switching push button, the battery with impulsive force at control circuit substrate 20The switch panel 22 of residual capacity display lamp etc., via the anterior window 23 that is arranged at installation portion 5And expose. The bottom of handle 3 and installation portion 5 link in the following way, under handle 3The linking part 24 that end arranges is highlightedly assembled with the 5a of the portion of splitting, the 5b of the left and right that forms installation portion 5And fixing by screw 25,25. Between linking part 24 and installation portion 5, accompany elastomeric material 26,The shock and vibration transmitting towards installation portion 5 from handle 3 can be relaxed. Battery pack 6 is by phaseSlide from front for installation portion 5 and by guide rail each other chimeric come the structure of combination, in conjunction withMeanwhile, the terminal board of terminal board 27 and the terminal of battery pack 5 sides that are arranged at installation portion 5 are electrically connectedConnect. The 28th, under the installment state of battery pack 6 with installation portion 5 engagings the fastener of anticreep, 29For removing the disengage button of fastener 28 in the time of the taking off of battery pack 6.

Be accommodated in main body cover 7 rear portion brushless motor 8 also as shown in Figure 4, be by fixedThe inner-rotor type that the rotor 31 of son 30 and its inner side forms. Stator 30 has: by multiple stackedThe stator core 32 of the tubular that steel plate forms, be arranged at respectively the axial front and back of stator core 32The front insulator 33 of end face and rear insulator 34 and reel via front and back insulator 33,34In six coils 35,35 of stator core 32 ... At rear insulator 34, sensor electrical is installedBase board 36 and short-circuit part 37.

Rear insulator 34 is and the integrally formed product of stator core 32 equidiameter ring shapes, in rear surface,As shown in Figure 5, be provided with highlightedly the maintaining part 38,38 of six groups of fusion terminals 43 described later ...This maintaining part 38 separates regulation so that have a pair of projection 39, the 39 groove mode opposite each other of grooveArranged spaced, between each maintaining part 38,38, is provided with not shown screw bosses highlightedly.

In addition, be formed with respectively a pair of recess 40,40 at the sidepiece of the left and right of rear insulator 34,And at the upper and lower sides across recess 40,40, be formed with respectively first of a pair of triangle and cutOral area 41,41. And, be formed with second of quadrangle shape in the center upper portion of rear insulator 34Notch 42.

And, maintain fusion terminal 43 in each maintaining part 38 of rear insulator 34. This fused endSon 43 forms banded metalwork doubling, and the at one end middle part of portion is formed with warpage and isThe bending part 44 of convex. Therefore, if the bending side of each fusion terminal 43 is inserted to maintaining part 38,Make both side edges chimeric with the slot part of projection 39,39 respectively, respectively fuse terminal 43 and remain sameOn heart circle, make bending part 44 be positioned at outside, make the other end 45 be positioned at inner side and be retained as with rearThe posture of the axially parallel of insulator 34.

For coil 35, reel in order towards the each tooth portion of stator core 32 with a spiral,By between coil 35,35 connect each spiral 35a walk around maintaining part 38 outside and by fused endThe bending part 44 of son 43 clamps, and is electrically connected thus with each fusion terminal 43.

Sensor electrical base board 36 carries three rotation detecting elements (omitting diagram), this rotation inspectionSurvey element to being arranged at the position of permanent magnet 59 of rotor 31 and detecting and by rotation detection signalOutput, and be the annulus with the external diameter of the inner side of maintaining part of being accommodated in 38, Zhou Yanshen establishes outsideBe equipped with four projections 46,46 that possess the through hole corresponding with the screw bosses of rear insulator 34 ...Make screw bosses connect the through hole of each projection 46, thereby locate in the rear surface of rear insulator 34.The holding wire 47 of rotation detecting element is extracted out from the bottom of sensor electrical base board 36.

Short-circuit part 37 be with sensor electrical base board 36 roughly with the resinous ring-type in footpath,Periphery, can for each screw bosses of rear insulator 34 four boss 48 chimeric from rear,48 ... one arranges highlightedly. In addition, for short-circuit part 37, possess on diagonalThe circular-arc sheet metal parts 49 of outstanding a pair of short-circuit piece 49A, 49A, possesses short-circuit piece equallyThe circular-arc sheet metal parts 50 of 50A, 50A and possess equally short-circuit piece 51A, 51ACircular-arc sheet metal parts 51 with under mutual contactless state on concentric circles under overlapping stateInsert-molding. Short-circuit piece 49A, 50A, 51A give prominence to also with radial from short-circuit part 49～51Corresponding with each fusion terminal 43, being formed with respectively at front end can be for the other end of fusion terminal 43The slit 52 that portion 45 inserts. Be welded with U phase, V phase, W phase at each sheet metal parts 49～51Each power line 53,53 ...

If make this short-circuit part 37 mode of the screw bosses insertion boss 48 of insulator 34 laterOverlapping and by screw 54,54 from the rear of sensor electrical base board 36 ... fixing, each moltenThe other end 45 of closing terminal 43 is inserted respectively the slit 52 of short-circuit piece 49A～51A accordingly.If will fuse terminal 43 and short-circuit piece 49A～51A welding under this state, be positioned at point-symmetricThe short circuit by sheet metal parts 49～51 respectively of fusion terminal 43,43. , with towards stator coreThe fusion terminal 43 of the spiral 35a electrical connection between 32 coils 35,35 of reeling is successively at diagonal angleBe electrically connected by three sheet metal parts 49～51 each other, become the triangle knot that so-called contraposition is reeledLine.

This is in the height dimension of fused end 43 includes sensor electrical base board 36 and short circuit inTherefore parts 37, even if use short-circuit part 37 grades also the total length of brushless motor 8 to be suppressed forLittle limit. And whole member storages are in stator iron except holding wire 47, power line 53In the external diameter of core 32, therefore the external diameter of product can not become large but compact yet.

The stator 30 of assembling is by the inner surface of splitting shell 7a, 7b towards main body cover 7 like thisKeep peripheries along the supporting rib 55,55 circumferentially arranging highlightedly respectively, and split shell 7a,The not shown projection that the inner face of 7b arranges highlightedly respectively with the side that is formed at rear insulator 34Recess 40 chimeric.

In addition, recess 56 engagings that arrange in the periphery left and right of front insulator 33 have is splitting shellThe front protrusion 7d that the inner surface of 7a, 7b arranges highlightedly and supporting with the front surface of stator core 32Connect the rear surface butt of rearward projection 7e and short-circuit part 37. Stator 30 is at main body cover 7 like thisInterior to be contained under the state of locating to axial and circumferentially. In addition, the first notch 41 withAnd second notch 42 in the case of the cartridge type shell that is accommodated in circular saw etc. and uses, canChimeric and apply in location by making to be arranged at the rib of cartridge type shell.

On the other hand, rotor 31 has: be positioned at axle center rotating shaft 57, be disposed at rotating shaft 57Surrounding the roughly rotor core 58 cylindraceous that multiple steel plates are laminated and be fixed onFour tabular permanent magnets (sintered magnet) 59,59 of the inside of rotor core 58 ... This foreverMagnet 59 inserts to lay respectively in the cross section of rotor core 58 centered by rotating shaft 57The through hole 60 that forms of the mode on foursquare four limits and by adhesive and/or be pressed intoAnd fix.

The rear end of rotating shaft 57 is held in the bearing 61 axle supportings at the rear portion of main body cover 7, frontEnd is held in the bearing 62 axle supportings of gear casing 12, makes to be formed with the front end of pinion 63Front towards gear casing 12 is outstanding. Position, rear at the bearing 62 of rotating shaft 57 is provided withCentrifugal blower 64. 65,65 ... to be formed at main body cover 7 in the position of centrifugal blower 64The exhaust outlet of the side of left and right, 66,66 ... rear surface air-breathing that is arranged at main body cover 7Mouth (Fig. 1).

In addition, in rotor 31, between rotor core 58 and centrifugal blower 64, be provided withFront limit device 67. These front limit device 67 brass systems and be have identical with rotor core 58 outsideThe plectane in footpath, is fixed on rotating shaft 57 coaxially with rotor core 58. On the other hand, at rotorBetween the bearing 61 of iron core 58 and rear side and in the inner side of sensor electrical base board 36, be provided withRear stop 68. This rear stop 68 is brass systems and has the external diameter less than rotor core 58Plectane, with rotor core 58 coaxial and and rotor core 58 between vacate under the state in gapBe fixed on rotating shaft 57. Wherein, the external diameter of rear stop 68 is compared by four permanent magnets 59 and is impaledInner side circle become large footpath, rear stop 68 is positioned at the rear of each permanent magnet 59.

And, in the space being impaled by hammer housing 9 and gear casing 12, be accommodated with main shaft 69And beater mechanism 10. Main shaft 69 have integratedly at rear portion to three planetary gears 71,71 ... the planet carrier portion 70 keeping, is formed with and has bottom outlet 72 in axle center, rear end, at front endBe formed with minor diameter part 73. Be held in gear casing 12 at hammer housing 9 inner main axis 69 by rear endBearing 74 carry out axle supporting, the internal gear 75 that is held in gear casing 12 in its front is engaged withPlanetary gear 71. And, the minor diameter part of front end 73 and the patchhole in axle center that is arranged at anvil 476 are inserted into coaxially, thereby are supported to coaxially and can rotate with rotating shaft 57. At this shapeThe pinion 63 of state Shaft 57 is inserted with bottom outlet 72 and at three planetary gears 71 from rearCentral engagement in each planetary gear 71.

Beater mechanism 10 by be loaded on outward main shaft 69 anterior hammer 77, be arranged at this hammer 77And the ball 78,78 between main shaft 69 and to the forwards helical spring of the application of force of hammer 7779 form. Thereby hammer 77 possesses a pair of pawl 80,80 at front surface can and be established in direction of rotationA pair of arm 81,81 engagings that are placed in the rear end of anvil 4 are formed with a pair of central authorities week in front endOutstanding chevron groove 82,82, is coaxially formed with cannelure 83 in rear surface towards the rear. Ball 78,78 are across the cam path 84 of the outer peripheral face that is arranged at main shaft 69 and the chevron groove 82 of hammer 77Between and chimeric, make main shaft 69 and hammer 77 integrated in direction of rotation. Wherein, at ball 78In slewing area with respect to cam path 84, allow the relative rotation of hammer 77 and move forward and backward.Helical spring 79 is outer to be loaded on main shaft 69 and to make front end insert the cannelure 83 of hammer 77, the opposing partyFace, makes the front surface butt of rear end and planet carrier portion 70, under normality by hammer 77 to making ball 78Be positioned at the progressive position pushing of the rear end central authorities of chevron groove 82 and the front end central authorities of cam path 84.85, the 86th, the bottom that is arranged at cannelure 83 come receiving auger spring 79 front end ball andPacking ring.

And by being arranged at, the bearing portion 87 of front end of hammer housing 9 keeps anvil 4Axle bush 88 is coaxial with main shaft 69 by axle supporting, by being arranged at bearing portion 87 and arm 81,81Between adjusting ring 89 complete the location towards front. Also as Fig. 6 A, Fig. 6 B, Fig. 6 C, Fig. 6 DShown, extend and be provided with court at the patchhole 76 inserting for the minor diameter part 73 of main shaft 69Extend until the lubricating grease storage part 90 of the inner side of axle bush 88 is arranged with in the periphery of anvil 4 in frontThere is the guiding groove 91 of ring-type, will by the lubricating grease supply hole radially 92 as oily feed pathBetween lubricating grease storage part 90 and guiding groove 91, link. Thus, via lubricating grease supply hole 92By the lubricating grease financial-supply-leading groove 91 of lubricating grease storage part 90, thereby realize axle bush 88 and anvil 4Between lubricated. The 93rd, the front that is arranged at axle bush 88 is by between bearing portion 87 and anvil 4Sealing ring.

In addition, be formed with for the chimeric cross section quadrangle shape of sleeve 95 at the front end of anvil 4Installation portion 94, on the other hand, arm 81 and lubricating grease supply hole 92 in the periphery of the rear portion of anvil 4Between, be concaved with the contraction flow region 96 as torsional deflection portion darker than cannelure 91, at contraction flow region96 position makes the external diameter of anvil 4 and area of section become minimum.

Due to this contraction flow region 96, for anvil 4, the turning round of the unit length shown in following formulaCorner ω becomes maximum in the position of contraction flow region 96.

ω＝(32/πd⁴)×(T/G)

D: diameter, T: moment of torsion, G: transverse elasticity coefficient

(32/πd⁴): with respect to the section modulus (inverse of section polar moment of inertia) reversing

That is, become minimum at the diameter of contraction flow region 96, thereby become with respect to the section modulus reversingGreatly, and then easily torsional deflection.

In the impact wrench 1 forming as described above, if trigger 16 is carried out to push operation,Switch 15 is communicated with and by the power supply of battery pack 6, brushless motor 8 is driven. , control electricityThe microcomputer of base board 20 obtains illustrating the rotation detecting element from sensor electrical base board 36Output rotor 31 permanent magnet 59 position rotation detection signal and obtain revolving of rotor 31Turn state, according to acquired rotation status, the connection/disconnection of each switch element controlled,Each coil 35 with respect to stator 30 makes current flowing successively, thereby rotor 31 is rotated. CauseThis, thus rotating shaft 57 rotates and make the planetary gear 71 of planet carrier portion 70 carry out planetary motionMain shaft 69 slows down and rotates, and via ball 78, hammer 77 is rotated, and therefore engages for hammer 77Thereby anvil 4 rotates and can carry out the fastening of bolt based on sleeve 95 etc.

If fastening proceeding and make anvil 4 moment of torsion improve, hammer 77 is resisted helical spring79 pushing and make ball 78,78 rotate towards the rear and retreat along cam path 84,84, ifPawl 80,80 separates from arm 81,81, makes ball 78,78 by the pushing of helical spring 79Along cam path 84,84 and towards front rotate, thereby hammer 77 rotates and advances, make pawl 80,80 engage with arm 81,81 again and make anvil 4 produce rotary impact power (impact). By off and onThis impact is further carried out fastening repeatedly.

Produce if impact, anvil 4 when colliding from pawl 80,80 and arm 81,81Screen resilience, hammer 77 rotates and retreats towards reverse directions, and helical spring 79 is compressed, therebySavings is for the energy impacting next time. Now anvil 4 at contraction flow region 96 with maximum torsion angleTorsional deflection, therefore produces the indent (helical spring 79 that makes hammer 77 compared with large screen resilienceDecrement) become large. Therefore, put aside can quantitative change large in helical spring 79, thereby based on punchingThe tightening torque of hitting increases. , if will there is no contraction flow region 96 at anvil 4 under identical modeImpact wrench and the tightening torque of the impact wrench 1 of the manner compare, the former is780Nm, the latter is 800Nm on the other hand, can confirm the increase of tightening torque.

On the other hand, be provided with front limit device 67 and rear stop 68 in rotor 31 front and back of rotation,Thereby the movement of the fore-and-aft direction of each permanent magnet 59 is limited, therefore prevent from rotor core 58Through hole 60 departs from. Therefore, the worry that does not have permanent magnet 59 to come off, thus can use reliableThe brushless motor 8 that property is high.

Like this, according to the impact wrench 1 of aforesaid way, anvil 4 with lubricating grease supply hole 92Different position, forming part, form make with respect to reverse section modulus than lubricating grease supply holeThe large torsional deflection portion (contraction flow region 96) of this section modulus of forming part, thereby can pass throughSimple structure improves fastening ability, and can not make hammer 77 maximize, and does not use output largeMotor. Therefore, to steel plate, the situation of bolted is inferior each other, in the rotation of impacting each timeAngle very hour effectively. On the other hand, if identical fastening ability can be used lessHammer, export little motor, therefore make miniaturization, the lightness of product.

Particularly make to spread all over the contraction flow region 96 forming on the complete cycle of anvil 4 herein as torsional deflectionPortion, therefore desirable torsional deflection portion can form simply.

In addition,, in aforesaid way, be formed for supplying with the profit of lubricating grease that is lubricating grease at anvilConsistent lubricant supply hole, but there is no anvil of lubricating grease supply hole etc., also can be by identical receipts be setContracting portion produces and makes fastening ability improve compared with large screen resilience. Now, preferably make the phase of contraction flow regionBecome for the section modulus reversing sleeve etc. installation portion with respect to 2 of the section modulus reversingDoubly.

In addition, the degree of depth of contraction flow region, width, section configuration are not limited to aforesaid way, Neng GoushiLocality changes to the degree of depth width that shoals and broadens, and section is V word shape, semicircle shape etc. Certainly as turning roundTurn variant part and be not limited to the contraction flow region on the complete cycle that spreads all over final output shaft, and can be by courtArrange recess, otch, the chamfered section etc. of outer peripheral portion make to become large with respect to the section modulus reversing.

In addition can be also that motor is not brushless percussion tool, the impact work of use AC power,Tools etc., are not limited to spanner as percussion tool, and anvil is set to the angle at right angle with respect to main shaftTo impact wrench, impact and revolve tool etc. and also can adopt the utility model.

Claims (3)

1. a percussion tool, it possesses:

Motor;

Main shaft, its driving by described motor is rotated; And

Beater mechanism, it can be accompanied by the rotation of described main shaft and final output shaft is applied to rotationImpulsive force, and radially form described final output shaft and described in described final output shaftBetween the bearing of whole output shaft, supply with the oily feed path of lubricating grease,

Described percussion tool is characterised in that,

The position shape different from forming part described oily feed path described final output shaftBecome torsional deflection portion, this torsional deflection portion makes in following formula with respect to the section modulus ratio reversingThe described section modulus of the forming part of described oily feed path is large,

ω＝(32/πd⁴)×(T/G)

ω: the torsion angle of unit length, d: diameter, T: moment of torsion, G: transverse elasticity coefficient

(32/πd⁴): with respect to the section modulus reversing.

2. a percussion tool, it possesses:

Motor;

Main shaft, its driving by described motor is rotated; And

Beater mechanism, it can be accompanied by the rotation of described main shaft and final output shaft is applied to rotationImpulsive force, and the installation portion of front end tool is set at the front end of described final output shaft,

Described percussion tool is characterised in that,

The position different from described installation portion at described final output shaft forms torsional deflection portion, shouldTorsional deflection portion makes to become with respect to the section modulus reversing in following formula the institute of described installation portionState the more than 2 times of section modulus,

ω＝(32/πd⁴)×(T/G)

ω: the torsion angle of unit length, d: diameter, T: moment of torsion, G: transverse elasticity coefficient

(32/πd⁴): with respect to the section modulus reversing.

3. percussion tool according to claim 1 and 2, is characterized in that,

Described torsional deflection portion spreads all over the complete cycle of described final output shaft and the contraction flow region that forms.