JP6615298B2 - Power tools - Google Patents

Description

  The present invention relates to a power tool such as an impact driver.

  For example, in an impact driver, a metal or resin case (also referred to as a “hammer case”) that accommodates a rotary hitting portion is assembled in front of a synthetic resin main body housing that accommodates a motor, and is attached to the tip of the case. The output shaft is arranged. A synthetic resin case cover is attached to the outer periphery of the case exposed from the main unit housing so that it does not directly touch the case whose temperature has risen due to the striking action. A ring-shaped bumper made of an elastic material such as rubber is assembled so that the case does not directly contact the workpiece. For example, as disclosed in Patent Document 1, this bumper has a structure in which the bumper is attached to the tip of the case cover in a state where the case cover is put on the case.

JP2013-146858A

  Accordingly, an object of the present invention is to provide a power tool that facilitates assembly of a case cover and a case.

In order to achieve the above object, an invention according to claim 1 drives a speed reduction portion, a case accommodating the speed reduction portion, an output shaft connected to the speed reduction portion and projecting forward from the case, and the speed reduction portion. And a housing that houses the motor, and a case cover that covers the case. The case is provided with an engaging portion, and a rear portion of the case cover is provided with an engaged portion that engages with the engaging portion. Thus, the forward movement of the case cover and the movement of the case cover in the rotational direction are restricted.
According to a second aspect of the present invention, there is provided a speed reducer, a case accommodating the speed reducer, an output shaft connected to the speed reducer and projecting forward from the case, a motor for driving the speed reducer, and a motor And a case cover that covers the case, and an engaging portion is provided on the case, and an engaged portion that engages with the engaging portion is provided on the rear portion of the case cover, and the case cover is moved forward. While the movement is restricted, the housing is divided into a pair of half housings, and a screw for assembling the half housings penetrates through holes formed in positioning pieces formed in the case.
According to a third aspect of the present invention, there is provided a speed reducer, a case accommodating the speed reducer, an output shaft connected to the speed reducer and projecting forward from the case, a motor for driving the speed reducer, and a motor And a case cover that covers the case, and an engaging portion is provided on the case, and an engaged portion that engages with the engaging portion is provided on the rear portion of the case cover, and the case cover is moved forward. While the movement is restricted, the engaging portion is a protrusion protruding from the outer surface of the case, and the engaged portion is a through hole formed in a coupling piece protruding rearward from the case cover. To do.
According to a fourth aspect of the present invention, there is provided a speed reducer, a case accommodating the speed reducer, an output shaft connected to the speed reducer and projecting forward from the case, a motor for driving the speed reducer, and a motor And a case cover that covers the case, and an engaging portion is provided in the case, and an engaged portion that engages with the engaging portion is provided in the rear portion of the case cover, and the case cover is moved forward. While restricting movement, the engaging portion and the engaged portion are covered with a housing.
According to a fifth aspect of the present invention, in the configuration of the fourth aspect, a concave portion is formed in a portion covering the engaging portion and the engaged portion in the housing.
According to a sixth aspect of the present invention, in the configuration according to any one of the first to fifth aspects, a ring-shaped bumper is provided on the front side of the case cover, and a rear portion of the bumper is provided at a front portion of the case cover. They are engaged with each other.
A seventh aspect of the invention is characterized in that, in the configuration of the sixth aspect, the rear part of the bumper is engaged with the front part of the case cover over the entire circumference.
According to an eighth aspect of the present invention, in the configuration of the sixth or seventh aspect, the inner peripheral surface of the bumper is fitted with the outer peripheral surface of the case, and the bumper is prevented from rotating.
In order to achieve the above object, the invention according to claim 9 drives the speed reduction portion, the case accommodating the speed reduction portion, the output shaft connected to the speed reduction portion and projecting forward from the case, and the speed reduction portion. And a housing that houses the motor, and a case cover that includes a coupling piece that covers the case and extends backward, and the case is provided with an engaging portion and the coupling piece is engaged with the engaging portion. An engaged portion is provided to restrict the forward movement of the case cover and the movement of the case cover in the rotational direction .
In order to achieve the above object, an invention according to claim 10 drives a speed reduction portion, a case accommodating the speed reduction portion, an output shaft connected to the speed reduction portion and projecting forward from the case, and the speed reduction portion. And a pair of half housings for housing the motors, screws for assembling the half housings, and through holes formed in the positioning pieces provided in the case for penetrating the screws. It is characterized by that.

  According to the present invention, the case cover and the case can be easily assembled.

It is a side view of a rechargeable impact driver. It is a front view of a rechargeable impact driver. It is the sectional view on the AA line of FIG. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is a perspective view of a half housing and a hammer case. It is a disassembled perspective view of a hammer case, a case cover, and a bumper.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 are explanatory views of a rechargeable impact driver which is an example of a power tool. A rechargeable impact driver (hereinafter simply referred to as an “impact driver”) 1 has left and right halved housings 2a and 2b mounted in the left and right direction. A housing 2 made of resin is formed by assembling with screws 3, 3,... A metal or resin hammer case 6 is assembled in front of the body portion 4 as a case for housing the spindle 7, the rotary striking portion 8, and the anvil 9 as an output shaft. A handle 10 protruding downward from the body portion 4 is formed at the lower portion of the housing 2, and a battery pack 12 serving as a power source is detachably mounted on a battery mounting portion 11 formed at the lower end of the handle 10. .

  11a is a convex portion protruding from the rear end of the battery mounting portion 11 and protrudes rearward from the rear surface of the battery pack 12 in the mounted state. Therefore, when the impact driver 1 is accidentally dropped, the convex portion 11a easily collides with the ground or the like before the battery pack 12, and the battery pack 12 is protected. Here, since the convex portion 11a is formed at the screwing position of the screw 3, the strength is also high.

  A switch 13 with a trigger 14 protruding forward is provided at the root portion in the handle 10, and a forward / reverse switching button 15 of the motor 5 is provided above the switch 13. Further, an extension portion 16 is formed between the trigger 2 and the lower portion of the hammer case 6 in the housing 2 so as to cover the center portion of the lower surface of the hammer case 6. The LED 17 facing toward is stored obliquely upward. Further, as shown in FIG. 5, a holding rib 19 that holds a magnetic plate 18 for preventing theft (shoplifting) is erected on the lower rear portion of the switch 13 in the handle 10. A lead wire wiring space (not shown) is formed in front. Reference numeral 20 denotes a noise shielding line filter wound around a lead wire.

  Here, the battery pack 12 is of a 10.8V voltage containing three cells (however, the number and voltage of the cells are arbitrary, and may be 14.4V, 18V, 36V, etc.). By being slid from the front of the mounting part 11, the terminal board 22 of the terminal block 21 provided in the battery mounting part 11 is electrically connected. 23 is a hook for retaining the battery pack 12, 24 is a button for releasing the hook, and 25 is a hanging hook screwed to the side surface of the battery mounting portion 11.

  The motor 5 is a direct current motor in which a stator and a rotor (not shown) are accommodated in a cylindrical motor case 26, and a rotating shaft 27 of the rotor is projected forward. As shown in FIG. 2a and 2b are coaxially held in the body portion 4 by ribs 28 and 28 formed in conformity with the shape of the motor case 26 on the inner periphery. Reference numeral 29 denotes a vent hole provided in the motor case 26 for discharging air from the fan provided on the rotary shaft 27. Reference numerals 30 and 30 denote terminals projecting from the rear end of the motor case 26. A plurality of exhaust ports 31, 31... Are formed outside the air holes 29. A plurality of front intake ports 32A and 32A are formed in front of the exhaust port 31 and outside the front part of the motor 5, and a plurality of rear intake ports 32B and 32B are formed outside the terminal 30 behind the exhaust port 31. Has been.

The rear end opening of the hammer case 6 is closed by a disc-shaped gear housing 33. The gear housing 33 is formed with a hexagonal flange 35 formed in the intermediate portion on the inner periphery of the half housings 2a and 2b in a state where the bearing portion 34 protruding from the front center of the motor case 26 is held at the rear end. By being locked between the receiving ribs 36, 36, the front is prevented from coming off. The gear housing 33 holds the bearing 37 and pivotally supports the rear end of the spindle 7.
The rotary shaft 27 penetrates the gear housing 33 and protrudes into the hammer case 6, and a pinion 38 is fitted at the tip thereof to mesh with two planetary gears 39 and 39 held on the outer periphery of the rear portion of the spindle 7. ing.

On the outer periphery of the front surface of the gear housing 33, there is formed a screw cylinder portion 40 into which the rear end of the hammer case 6 is screwed and coupled, and an internal gear 41 that meshes with the planetary gears 39, 39 is provided on the outer periphery of the front end. The flange portion 42 is positioned by being sandwiched between the screw tube portion 40 and a step portion 43 provided on the inner periphery of the rear end of the hammer case 6. A pair of arms 44 and 44 extend radially. The rotary striking portion 8 is externally mounted on the front end of the spindle 7, and a hammer 45 having a pair of claws 46, 46 engaged with the arms 44, 44, and the hammer 45 is urged to a forward position where the hammer 45 is engaged with the arms 44. The coil spring 47 is provided. The hammer 45 is interposed via balls 50, 50 which are fitted over outer cam grooves 48, 48 recessed in the inner peripheral surface and inner cam grooves 49, 49 recessed in the outer peripheral surface of the spindle 7. Are connected to the spindle 7.

On the other hand, the anvil 9 is pivotally supported by a bearing 52 in a small-diameter tip tube 51 formed at the front end of the hammer case 6 and protrudes at the rear end into a bearing hole 53 formed at the front end axis of the spindle 7. The provided small diameter portion 54 is inserted to support the front end of the spindle 7 coaxially. The bearing 52 protrudes rearward from the rear end of the front end tube 51, and a washer 55 that abuts against the front inner surface of the hammer case 6 is mounted on the protruding portion to position the front positions of the arms 44, 44. Yes.
Further, a bit mounting hole 56 is formed at the front end of the anvil 9 projecting forward from the hammer case 6, and a ball 57 and a sleeve 58 for retaining the bit inserted into the mounting hole 56 are provided. A chuck mechanism is provided.

  The hammer case 6 has a rear portion screwed and coupled to the screw cylinder portion 40 of the gear housing 33 and inserted into the body portion 4 of the housing 2, and a front end tapered toward the front end cylinder 51. As shown in FIG. 6, a pair of chamfered portions 61, 61 as case / bumper fitting portions are formed on the top and bottom of the tip tube 51 in a cylindrical shape having a continuous taper portion 60. Further, as shown in FIG. 5, a positioning piece 62 having a through hole 63 projects in the front-rear direction at a position slightly deviated from the center in the left-right direction on the lower surface of the equi-diameter portion 59 of the hammer case 6. ing. This positioning piece 62 has screw bosses 64, 64 provided on the left and right half housings 2a, 2b in the extended portion 16 (the left screw boss 64 is longer than the right screw boss 64 in accordance with the position of the positioning piece 62). The hammer case 6 is prevented from being detached and prevented from rotating by being screwed in a state where the screw 3 is passed through the through-hole 63. In FIG. 5, the phase of the hammer case 6 is shifted to the right by approximately 90 degrees in order to show the positioning piece 62. By shifting the positioning piece 62 to the right side from the left and right centers in this way, the left screw boss 64 on which the female screw is formed can be formed with the same length as the other screw bosses. Even if the positioning piece 62 is provided, the common screw 3 Can be used.

  Further, lateral chamfered portions 65, 65 extending in the front-rear direction are formed on the left and right side surfaces of the equi-diameter portion 59 of the hammer case 6, and a notch 67 is formed in the front center at the rear of each lateral chamfered portion 65. Each of the rectangular rear projections 66 is formed with a circular front projection 68 as an engaging portion located in front of the notch 67 of the rear projection 66 at the front portion of each lateral chamfered portion 65. Is formed.

  On the other hand, the front portion of the hammer case 6 exposed from the body portion 4 is covered with a case cover 69 and a bumper 70. First, the case cover 69 is a resin cylinder, and as shown in FIG. 6, as shown in FIG. 6, an equal diameter rear cylinder portion 71 covering the equal diameter portion 59 and a tapered front cylinder portion 72 covering the taper portion 60. And a V-shaped horizontal notch 74 that extends to the chevron 73 formed at the front ends of the half housings 2a and 2b that form the body 4 and extends at the rear end of the rear cylinder 71 A U-shaped lower notch 75 that matches the portion 16 is formed. Further, a pair of coupling pieces 76, 76 as a housing / cover fitting portion projecting rearward inside the horizontal notch 74 are projected from the left and right rear end edges of the rear cylinder portion 71. The coupling piece 76 includes an inverted T-shaped tip 77 that fits into the notch 67 of the rear projection 66 when the case cover 69 is assembled to the hammer case 6, and a front fitting 68 that fits into the front projection 68. It is formed of a thin portion 78 that is provided with a through hole 79 as an engaging portion and is thinner than the tip portion 77.

A fitting recess 80 as a housing / cover fitted portion is formed on the inner surface of the chevron portions 73, 73 located outside the coupling pieces 76, 76 from the front end to the rear. The fitting recess 80 includes a deep bottom portion 81 where both the rear protrusion 66 of the hammer case 6 and the tip end portion 77 of the coupling piece 76 are fitted, and a shallow portion where the thin portion 78 is fitted in front thereof. In the state where the hammer case 6 having the bottom cover 82 and the case cover 69 attached is assembled to the body portion 4, the movement of the coupling piece 76 to the outside is restricted to prevent it from coming off.
Further, a ring-shaped engaging portion 83 that is bent toward the center is formed at the front end of the front cylindrical portion 72 of the case cover 69. On the left and right sides of the front cylindrical portion 72, rear thick portions 84 and 84 are formed, which are positioned in front of the coupling pieces 76 and 76, respectively.

  Next, the bumper 70 is a rubber ring body that is externally attached to the tip tube 51 of the hammer case 69 adjacent to the case cover 69, and the outer peripheral surface is a front portion that is continuous with the front tube portion 72 of the case cover 69. Formed in a tapered shape, front and rear thick portions 85 and 85 that are continuous with the rear thick portions 84 and 84 of the case cover 69 are formed on the left and right sides. A ring-shaped engaging groove 86 into which the engaging portion 83 of the case cover 69 is fitted is formed on the outer periphery of the rear end of the bumper 70, and a ring-shaped front covering the front end of the tip tube 51 is formed at the front end of the bumper 70. A wall portion 87 is formed. Here, since the rear end of the sleeve 58 overlaps with the front end of the bumper 70, the dimension in the front-rear direction is shortened. Further, since the bumper 70 holds the front end of the case cover 69, the case cover 69 is difficult to rattle. Further, as shown in FIG. 4, since the inner periphery of the bumper 70 has a dent and a gap with the tip tube 51, the bumper 70 is less susceptible to heat and transmits vibrations. The case cover 69 is more difficult to rattle.

  Further, on the upper and lower sides of the inner peripheral surface of the bumper 70, inner surface chamfers 88, 88 are formed as case / bumper fitted portions to be fitted to the chamfered portions 61, 61 provided on the tip cylinder 51 of the hammer case 6. Has been. In addition, although the engaging part 83 and the engaging groove 86 are engaged in the perimeter of the circumferential direction here, what is necessary is just to engage with at least one part. Further, the case cover 69 and the bumper 70 may be fixed by integral molding or the like.

  In the impact driver 1 configured as described above, the case cover 69 is first inserted into the engagement groove 86 of the bumper 70 in a phase in which the bumper 70 is aligned with the front end of the case cover 69 and the front thick portion 85 is aligned with the rear thick portion 84. It is assembled by engaging the engaging portions 83 of 69. Then, the case cover 69 is assembled | attached from the front to the hammer case 6 which accommodated the spindle 7, the rotation hit | damage part 8, the anvil 9, etc., and couple | bonded the gear housing 33. FIG. That is, the front end portions 77 of the left and right coupling pieces 76 are fitted into the notches 67 of the rear projection 66, and the front projection 68 is fitted into the through hole 79. Then, the rear end of the engagement groove 86 of the bumper 70 is sandwiched between the engagement portion 83 of the case cover 69 and the front end of the taper portion 60 of the hammer case 6 so as to be prevented from coming off. , 88 are engaged with the chamfered portions 61, 61 of the tip tube 51 and are prevented from rotating.

Next, the hammer case 6 is placed on the left half housing 2a assembled with the motor 5, the switch 13, etc., at the front and rear positions where the flange 35 of the gear housing 33 is located behind the receiving rib 36 of the half housing 2a, and The positioning piece 62 is assembled at a rotational position located on the screw boss 64 of the extended portion 16, and the right half-split housing 2 b is covered and coupled by the screw 3.
Then, as described above, the flange 35 is locked to the receiving rib 36, and the positioning piece 62 is passed through the screw 3 between the screw bosses 64, 64, so that the hammer case 6 is coupled to the housing 2. At this time, since the rear projection 66 of the hammer case 6 and the coupling piece 76 of the case cover 69 are fitted in the fitting recess 80 provided in the angled portion 73 of the half housing 2a, 2b, the case together with the hammer case 6 The cover 69 is also prevented from coming off. In this state, the chevron 73 fits into the lateral notch 74 of the case cover 69, and the extended portion 16 fits into the lower notch 75 of the case cover 69. Do not expose.

  When the impact driver 1 is used, when the trigger 14 provided on the handle 10 is operated to turn on the switch 13 and drive the motor 5, the rotation of the rotary shaft 27 is decelerated via the planetary gears 39 and 39. Then, it is transmitted to the spindle 7 and the spindle 7 is rotated. The planetary gear 39 and the internal gear 41 serve as a reduction unit. Since the spindle 7 rotates the hammer 45 via the balls 50 and 50 and rotates the anvil 9 with which the hammer 45 engages, the screw 7 can be tightened with a bit attached to the tip of the anvil 9.

  When the tightening of the screw is advanced and the torque of the anvil 9 is increased, the rotation of the hammer 45 and the rotation of the spindle 7 are shifted, so that the ball 45 rolls along the inner cam grooves 49, 49. Accordingly, the coil spring 47 moves backward against the urging force of the coil spring 47 while rotating relative to the spindle 7. Then, when the claws 46 of the hammer 45 are disengaged from the arms 44, 44, the hammer 45 is rotated by the balls 50, 50 rolling toward the tips of the inner cam grooves 49, 49 by the bias of the coil spring 47. While moving forward. Therefore, the hammer 45 is again engaged with the anvil 9 to generate a rotational impact force (impact). Further tightening is performed by repeatedly engaging and disengaging the anvil 9.

  When the impact occurs, heat is generated in the rotary hitting portion 8 or the like and the temperature of the metal hammer case 6 rises, so that the operator does not touch the hammer case 6 directly by the case cover 69. Therefore, there is no discomfort due to heat. Further, since the front surface of the hammer case 6 is covered with the bumper 70 on the outer side of the tip tube 51, the bit comes off from the screw head during screw tightening and the front surface of the hammer case 6 comes into contact with the workpiece. Even in such a case, the impact is absorbed by the bumper 70 and the risk of damaging the workpiece is reduced. Particularly, since the rear end of the bumper 70 is sandwiched between the case cover 69 and the hammer case 6 when the engaging portion 83 of the case cover 69 is engaged with the engaging groove 86, the bumper 70 is made of the workpiece. Even if it collides with the hammer case 6, it is difficult to come off from the hammer case 6.

  Thus, according to the impact driver 1 of the said form, the rotation impact part 8, the hammer case 6 which accommodates the rotation impact part 8, and the anvil 9 which is connected to the rotation impact part 8 and protrudes ahead from the hammer case 6 And a bumper 70 disposed on the outer periphery of the front portion of the hammer case 6, and a case cover 69 that covers the hammer case 6 behind the bumper 70 and holds the bumper 70 between the hammer case 6 and The bumper 70 can be securely fixed to prevent the hammer case 6 from coming off.

Particularly, here, the chamfered portions 61 and 61 are formed on the tip tube 51 of the hammer case 6, and the inner chamfered portions 88 and 88 into which the chamfered portions 61 and 61 are fitted are formed on the bumper 70. Thus, the bumper 70 is fixed in a state of being prevented from rotating.
And a housing 2 that houses the motor 5 for driving the rotary striking portion 8. The case cover 69 is formed with coupling pieces 76, 76, and the chevron portions 73, 73 of the housing 2 are By forming the fitting recesses 80, 80 into which the coupling pieces 76, 76 are fitted, the case cover 69 using the housing 2 can be prevented from coming off.
Furthermore, since the front end of the case cover 69 and the rear end of the bumper 70 are engaged with each other by the engaging portion 83 and the engaging groove 86, the bumper 70 can be prevented from coming off more effectively.

  On the other hand, in the impact driver 1, the rotary hitting portion 8, the hammer case 6 that accommodates the rotary hitting portion 8, the anvil 9 that is connected to the rotary hitting portion 8 and projects forward from the hammer case 6, The case cover 69 includes a bumper 70 disposed on the outer periphery of the front portion, a motor 5 for driving the rotary hitting portion 8, a housing 2 that houses the motor 5, and a case cover 69 that covers the hammer case 6. Since the bumper 70 is arranged on the inner peripheral side of the front part, rattling of the case cover 69 can be prevented.

In addition, the hammer case 6 is provided with an engaging portion (front projection 68), and a rear portion of the case cover 69 is provided with an engaged portion (through hole 79) that engages with the engaging portion. Since the movement of the case cover 69 is restricted, the case cover 69 can be prevented from being detached from the side surface of the hammer case 6 or the like.
Further, since the screws 3 for assembling the half housings 2a and 2b are passed through the through holes 63 provided in the positioning pieces 62 of the hammer case 6, the screws 3 for assembling the housing 2 are used to prevent the hammer case 6 from coming off and rotate. It is a rational configuration used for stopping.

The chamfered portion of the hammer case and the inner chamfered portion of the bumper may be increased in number or vice versa. In addition, as long as they can be fitted to each other to prevent rotation, the case / bumper fitting part and the case / bumper fitting part are not limited to the chamfered part, but may be polygonal fittings such as hexagons. The design can be changed as appropriate.
On the other hand, when the housing and the case cover are fitted, either the front protrusion or the rear protrusion of the hammer case is eliminated, and the coupling piece of the case cover is fitted with the fitting recess of the housing, or both protrusions are eliminated. Thus, a simple retaining structure in which the coupling piece is fitted into the fitting recess can be obtained. It is also possible to reverse the relationship between the housing / cover fitting part and the housing / cover fitted part, for example, by fitting a coupling piece on the housing and fitting it into a fitting recess provided on the inner surface of the case cover. is there.

  In addition, the motor may be a brushless motor or a commutator motor, or an AC power source may be used as a power source. The rotary impact tool is not limited to an impact driver, but includes an impact wrench, a soft impact driver using an oil unit as the rotary impact part, and the like, and a case cover and a bumper outside the case that accommodates the rotary impact part. If present, the present invention is applicable. However, the power tool which does not have a rotation striking part may be sufficient. For example, it can be applied to a driver drill, a hammer drill, a reciprocating saw, and the like. The power source is not limited to electricity, and may be compressed air, an engine, or the like.

  1 .. Rechargeable impact driver, 2. Housing, 2a, 2b, Half housing 4. Body, 5. Motor, 6. Hammer case, 7. Spindle, 8. Spinning impact part, 9 .... anvil, 10 ... handle, 12 ... battery pack, 27 ... rotating shaft, 45 ... hammer, 47 ... coil spring, 51 ... tip tube, 59 ... equidiameter part, ...... taper part , 61 .. Chamfered part, 62 .. Positioning piece, 65 .. Lateral chamfered part, 66 .. Rear projection, 67 .. Notch, 68 ... Front projection, 69 ... Case cover, 70 71 ··· Rear cylinder portion, 72 ··· Front cylinder portion, 73 ·· Angle portion, 76 · · Joint piece, 77 · · Tip portion, 78 · · Thin wall portion · · · · Recessed fitting portion · · · · Joint part 86 .. Engagement groove 88.

Claims (10)

A deceleration unit;
A case for accommodating the speed reduction part;
An output shaft connected to the speed reduction portion and projecting forward from the case;
A motor for driving the speed reducer;
A housing for housing the motor;
A case cover covering the case,
The case is provided with an engaging portion, and a rear portion of the case cover is provided with an engaged portion that engages with the engaging portion, so that the case cover moves forward and the case cover moves in the rotation direction. Power tool characterized by regulating A deceleration unit;
A case for accommodating the speed reduction part;
An output shaft connected to the speed reduction portion and projecting forward from the case;
A motor for driving the speed reducer;
A housing for housing the motor;
A case cover covering the case,
While providing an engaging part in the case and providing an engaged part that engages with the engaging part at the rear part of the case cover, while restricting the forward movement of the case cover,
The power tool according to claim 1, wherein the housing is divided into a pair of half housings, and a screw for assembling the half housing passes through a through hole formed in a positioning piece provided in the case. A deceleration unit;
A case for accommodating the speed reduction part;
An output shaft connected to the speed reduction portion and projecting forward from the case;
A motor for driving the speed reducer;
A housing for housing the motor;
A case cover covering the case,
While providing an engaging part in the case and providing an engaged part that engages with the engaging part at the rear part of the case cover, while restricting the forward movement of the case cover,
The engaging portion is a protrusion protruding from the outer surface of the case, and the engaged portion is a through hole formed in a coupling piece protruding rearward from the case cover. tool. A deceleration unit;
A case for accommodating the speed reduction part;
An output shaft connected to the speed reduction portion and projecting forward from the case;
A motor for driving the speed reducer;
A housing for housing the motor;
A case cover covering the case,
While providing an engaging part in the case and providing an engaged part that engages with the engaging part at the rear part of the case cover, while restricting the forward movement of the case cover,
The power tool, wherein the engaging portion and the engaged portion are covered with the housing.   The power tool according to claim 4, wherein a concave portion is formed in a portion covering the engaging portion and the engaged portion in the housing. A ring-shaped bumper is provided on the front side of the case cover,
The power tool according to any one of claims 1 to 5, wherein a rear portion of the bumper is engaged with a front portion of the case cover.   The power tool according to claim 6, wherein a rear portion of the bumper is engaged with a front portion of the case cover over the entire circumference.   The power tool according to claim 6 or 7, wherein an inner peripheral surface of the bumper is fitted with an outer peripheral surface of the case to prevent the bumper from rotating. A deceleration unit;
A case for accommodating the speed reduction part;
An output shaft connected to the speed reduction portion and projecting forward from the case;
A motor for driving the speed reducer;
A housing for housing the motor;
A case cover that covers the case and includes a coupling piece extending rearward;
The case is provided with an engaging portion, and the coupling piece is provided with an engaged portion that engages with the engaging portion to restrict the forward movement of the case cover and the movement of the case cover in the rotation direction. A power tool characterized by A deceleration unit;
A case for accommodating the speed reduction part;
An output shaft connected to the speed reduction portion and projecting forward from the case;
A motor for driving the speed reducer;
A pair of half housings for housing the motor;
A screw for assembling the half housing;
A power tool, comprising: a positioning hole provided in the case; and a through hole for allowing the screw to pass therethrough.

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