JP5825067B2 - Electric tool - Google Patents

Description

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

  Generally, an impact driver includes a housing that houses a motor, an inner gear case that incorporates an inner gear that decelerates rotation of the motor, and a hammer case that houses a hammer that converts rotation of the inner gear into striking force. Yes.

  In the conventional impact driver, the hammer case is screwed to the housing so as to withstand the load generated in the hammer case. However, in such an impact driver, a screw seat surface or the like must be provided on the hammer case, and therefore, the screw seat surface protrudes from the outer portion, and there is a problem that the usability of the tool is deteriorated.

  As a method of avoiding such a problem, a structure in which the hammer case is not fixed by screws but is fixed by being sandwiched by a housing is conceivable (for example, Patent Document 1).

Japanese Patent No. 4432401 Japanese Patent No. 3793099

  By the way, the above-described electric power tool described in Patent Document 1 has a structure in which the inner gear case is fitted inside the hammer case in order to ensure the centering accuracy by aligning the centers of the hammer case and the inner gear case. ing. For this reason, the portion where the hammer case and the inner gear case are fitted has a problem in that the two members overlap to increase the thickness and the outer diameter increases.

  Further, for the purpose of ensuring the alignment accuracy between the hammer case and the inner gear case, the fitting between the hammer case and the inner gear case is set tightly, and a large force is required for insertion. Moreover, since it has a sealing property for enclosing grease inside, there is a problem that the internal air is compressed when inserting the rotating shaft of the motor, and a large force is required for the insertion. .

  Then, this invention makes it a subject to provide the electric tool which made the outer diameter of an electric tool small, can implement | achieve slimming, and improved the assembly | attachment property.

  The present invention has been made to solve the above-described problems, and is characterized by the following.

(Claim 1)
The invention described in claim 1 is characterized by the following points.

That is, the electric tool according to claim 1 includes a motor, a housing that houses the motor, an inner gear case that includes one end connected to the motor and that transmits an inner gear that transmits the driving force of the motor, A hammer case that is disposed on the other end side of the inner gear case and houses a striking mechanism that transmits the driving force of the motor via the inner gear, and the inner gear case and the hammer case are fitted in the housing while being opposed to the end surface, by providing the elastic body between the end surfaces facing each other, and the inner gear case and the hammer case has so as not to contact each other, the The inner gear case is urged by the elastic body in a direction away from the hammer case, and the hammer case is supported by the elastic body. Characterized in that it is biased in a direction away from the inner gear case Te.

(Claim 2)
The invention described in claim 2 has the following features in addition to the features of the invention described in claim 1 described above.

That is, a groove is formed on the opposed end faces, and an elastic body is attached to the groove .

(Claim 3)
The invention described in claim 3 is characterized by the following points in addition to the characteristics of the invention described in claim 1 or 2.

That is, the inner gear case and the hammer case each include a flange portion that fits into the housing .

  The invention according to claim 1 is as described above, and the inner gear case and the hammer case are fitted inside the housing with their end faces opposed to each other. Thus, since it is not the structure which made the inner gear case fit inside the hammer case, the outer diameter of an electric tool can be made small and slimming can be implement | achieved.

  Further, since the inner gear case and the hammer case are not fitted, there is no problem in the conventional electric tool that a large force is required to insert the inner gear case inside the hammer case.

  Moreover, even if it has a sealing property for enclosing grease inside, the sealing property is exhibited after being fitted inside the housing, so the inner gear is connected to the rotating shaft of the motor. If it is made to fit in the inside of the housing after it is compressed, air is not compressed, and a large force is not required when inserting the rotating shaft of the motor.

  As described above, according to the present invention, since there is no tight fitting or air compression, the inner gear case and the hammer case can be attached to the housing with a light force, and the assembling property is improved.

Also, before Symbol for the elastic member is provided between the inner gear case and the hammer case, it is possible to seal the grease reliably.

  Moreover, the inner gear case and the hammer case can be pressed against the housing by using the elastic force of the elastic body, and the inner gear case and the hammer case can be fixed to the housing without rattling.

The invention according to claim 3 is as described above, and the inner gear case and the hammer case each include a flange portion that fits into the housing . Thus, since the inner gear case and the hammer case was combined surface can be fixed sandwiched integrally, assembling property is improved.

It is a side view of an electric tool. It is a figure which shows the internal structure of an electric tool. It is a partially expanded sectional view of the junction location of an inner gear case and a hammer case. It is a side view which shows the state which removed the inner gear case and the hammer case from the electric tool. It is a perspective view which shows the state which removed the inner gear case and the hammer case from the electric tool. It is a disassembled side view of an electric tool. It is a disassembled perspective view of an electric tool.

  Embodiments of the present invention will be described with reference to the drawings.

  The electric power tool 10 according to the present embodiment is an impact driver having a motor 15 mounted therein, and as shown in FIG.

  As shown in FIG. 1, the housing 11 is provided with a cylindrical output portion 12, a grip portion 13 extending in a direction substantially orthogonal to the output portion 12 at a lower portion of the output portion 12, and a lower portion of the grip portion 13. A battery pack mounting portion 14.

  As shown in FIG. 2, the output unit 12 includes a motor 15.

  A cooling fan 17 is provided in series behind the motor 15 so as to be coaxial with the rotating shaft 15 a of the motor 15. The cooling fan 17 is disposed at the rearmost part of the output unit 12 and rotates simultaneously when the motor 15 rotates. As a result, external air is sucked from the intake holes that open to the side of the housing 11, and the sucked air is discharged to the outside from the exhaust holes that open to the side of the housing 11.

  An inner gear case 20 is connected to the front of the motor 15 (the side opposite to the side on which the cooling fan 17 is provided), and a hammer case 30 is further disposed in front of the inner gear case 20.

  The inner gear case 20 has a rear end connected to the motor 15 and incorporates an idle gear 21 that rotates with the driving force of the motor 15. More specifically, the rotating shaft 15a of the motor 15 is inserted and connected from the rear end side, whereby the rotating shaft 15a of the motor 15 is engaged with the idle gear 21, and the idle gear 21 is activated when the motor 15 rotates. It is formed to do. The idle gear 21 forms a planetary gear mechanism by meshing with the inner gear 22, and is thereby configured to decelerate the rotation of the motor 15 and transmit it to a spindle 33 described later.

  The hammer case 30 is disposed at the front end of the inner gear case 20 described above, and transmits the driving force of the motor 15 via the inner gear 22. The hammer case 30 includes a spindle 33, a striking mechanism 31, and an anvil 34 provided in series coaxially with the rotation shaft 15 a of the motor 15.

  The striking mechanism 31 includes a hammer 31a, a spring 31b, and the like, converts the rotation of the spindle 33 into a rotating striking force, and transmits this rotating striking force to the anvil 34 that is rotatably supported by the hammer case 30.

  An output shaft 16 is formed at the tip of the anvil 34, and a driver bit (tip tool) (not shown) can be attached. Thus, when the motor 15 is rotated with the driver bit attached to the output shaft 16, the driver bit is rotated and struck by the driving force of the motor 15.

  The grip part 13 provided in the lower part of the output part 12 described above is a part for gripping the electric tool 10. As shown in FIG. 1, a trigger switch 19 is disposed near the boundary between the grip portion 13 and the output portion 12. By pulling the trigger switch 19, the motor 15 starts to rotate and the electric tool 10 starts to operate. The trigger portion 23 of the trigger switch 19 is disposed at a position where the index finger is applied when the grip portion 13 is gripped.

  The battery pack mounting part 14 provided further below the grip part 13 is a part for attaching and detaching a battery pack (not shown) to the lower surface. In addition, an operation panel 18 is provided on the upper surface side of the battery pack mounting portion 14, and a mode setting button for changing the rotation mode is provided.

  By the way, the inner gear case 20 and the hammer case 30 described above are fitted inside the housing 11 with their end faces 20a and 30a facing each other.

  At this time, the inner gear case 20 and the hammer case 30 are not in contact with each other by sandwiching the elastic body 40 (rubber O-ring in the present embodiment). That is, as shown in FIG. 3, since the elastic body 40 is provided between the inner gear case 20 and the hammer case 30, the end surface 20a of the inner gear case 20 and the end surface 30a of the hammer case 30 are The elastic bodies 40 are opposed to each other with a space therebetween.

  As shown in FIG. 3, the elastic body 40 sandwiched between the inner gear case 20 and the hammer case 30 is pressed from both sides and elastically deformed. In other words, the inner gear case 20 and the hammer case 30 are different from each other. The elastic bodies 40 are biased in directions away from each other by the reaction force of the elastic body 40.

  Further, the inner gear case 20 is provided with a flange portion 20 b that protrudes in the outer peripheral direction, and the flange portion 20 b is fitted to the inner gear case fitting portion 11 c of the housing 11.

  Since the flange portion 20b is formed to be slightly narrower than the width of the inner gear case fitting portion 11c, the flange portion 20b is loosely fitted when no force is applied from the outside. Since 20 is urged away from the hammer case 30 by the elastic body 40, the rear surface 20c of the flange portion 20b comes into contact with the front surface (rear movement restricting portion 11d) of the inner gear case fitting portion 11c. The inner gear case 20 is urged to the position. Thus, while being urged | biased by the elastic body 40, 11 d of back movement control parts restrict | limit the movement of the inner gear case 20, and the positioning in the housing 11 of the inner gear case 20 is performed.

  Similarly, the hammer case 30 is provided with a flange portion 30 b that protrudes in the outer peripheral direction, and this flange portion 30 b is fitted to the hammer case fitting portion 11 a of the housing 11.

  Since the flange portion 30b is formed slightly narrower than the width of the hammer case fitting portion 11a, the flange portion 30b is loosely fitted in a state where no external force is applied. Since the elastic body 40 is biased in the direction away from the inner gear case 20, the front surface 30c of the flange portion 30b reaches a position where the front surface 30c contacts the rear surface (forward movement restricting portion 11b) of the hammer case fitting portion 11a. The hammer case 30 is energized. Thus, while being urged | biased by the elastic body 40, the front movement control part 11b controls the movement of the hammer case 30, and positioning in the housing 11 of the hammer case 30 is performed.

  4 and 5 are views showing a state where the inner gear case 20 and the hammer case 30 are removed from the electric tool 10. As shown in these drawings, the housing 11 has the inner gear case 20 and the hammer case 30 sandwiched and fixed between the left and right divided pieces 11e and 11f. The inner gear case 20 and the hammer case 30 are sandwiched and fixed integrally with the divided pieces 11e and 11f of the housing 11 with the elastic body 40 sandwiched therebetween.

  However, the inner gear case 20 and the hammer case 30 in this embodiment are in a state of being separable from each other as shown in FIG. 6 and FIG. It has not been.

  That is, when attaching the inner gear case 20 and the hammer case 30 in the present embodiment, the elastic body 40 is attached to the groove 20d formed on the end surface 20a of the inner gear case 20, and the rotation of the motor 15 is performed on the inner gear case 20. Insert the shaft 15a. After that, the end surface 20a of the inner gear case 20 is mated so that the end surface 30a of the hammer case 30 faces, and is fitted into the housing 11 (any one of the divided pieces 11e and 11f) (the flange portion 20b of the inner gear case 20). Is fitted to the inner gear case fitting portion 11c of the housing 11, and the flange portion 30b of the hammer case 30 is fitted to the hammer case fitting portion 11a of the housing 11. Thereafter, the divided pieces 11e and 11f are coupled with screws or the like, and the inner gear case 20 and the hammer case 30 are sandwiched and fixed.

  As described above, according to the present embodiment, the inner gear case 20 and the hammer case 30 are fitted inside the housing 11 with the end surfaces 20a and 30a facing each other. Since the inner gear case 20 is not fitted, the outer diameter of the electric power tool 10 can be reduced to achieve slimming.

  Further, since the inner gear case 20 and the hammer case 30 are not fitted, there is no problem in the conventional electric tool that a large force is required to insert the inner gear case 20 inside the hammer case 30. . Therefore, the inner gear case 20 and the hammer case 30 can be attached to the housing 11 with a light force, and the assembling property is improved.

  Moreover, the elastic body 40 can enclose the grease formed in the inner gear case 20 and the hammer case 30, and it is the inner gear case 20 and the hammer that exhibit sealing properties for enclosing the grease. Since it is after fitting the case 30 in the housing 11, when inserting the rotating shaft 15a of the motor 15, air is not compressed and resistance does not become large, and it can assemble smoothly.

  Further, since the elastic body 40 is provided between the inner gear case 20 and the hammer case 30, the inner gear case 20 and the hammer case 30 can be pressed against the housing 11 and fixed using the elastic force of the elastic body 40, The inner gear case 20 and the hammer case 30 can be fixed to the housing 11 without rattling.

  Further, the housing 11 includes a rear movement restricting portion 11 d that restricts the inner gear case 20 from moving in a direction away from the hammer case 30, and the hammer case 30 moving in a direction away from the inner gear case 20. And a forward movement restricting portion 11b for restricting. Thereby, the inner gear case 20 and the hammer case 30 that are mated can be integrally sandwiched and fixed by the rearward movement restricting part 11d and the forward movement restricting part 11b, so that the assembling property is improved.

DESCRIPTION OF SYMBOLS 10 Electric tool 11 Housing 11a Hammer case fitting part 11b Forward movement control part 11c Inner gear case fitting part 11d Back movement control part 11e, f Dividing piece 12 Output part 13 Grip part 14 Battery pack attachment part 15 Motor 15a Rotating shaft 16 Output shaft 17 Cooling fan 18 Operation panel 19 Trigger switch 20 Inner gear case 20a End surface 20b Flange portion 20c Rear surface 20d Groove portion 21 Idle gear 22 Inner gear 30 Hammer case 30a End surface 30b Flange portion 30c Front surface 31 Impact mechanism 31a Hammer 31b Spring 34 Anvil 40 elastic body

Claims (3)

A motor,
A housing for housing the motor;
An inner gear case having one end connected to the motor and incorporating an inner gear for transmitting the driving force of the motor;
A hammer case that is disposed on the other end side of the inner gear case and houses a striking mechanism that transmits the driving force of the motor via the inner gear;
With
The inner gear case and the hammer case is fitted in the housing while being opposed to the end faces of each other,
By providing an elastic body between the opposed end faces, the inner gear case and the hammer case are not in contact with each other,
The inner gear case is urged by the elastic body in a direction away from the hammer case,
The power tool according to claim 1, wherein the hammer case is urged by the elastic body in a direction away from the inner gear case . The power tool according to claim 1 , wherein a groove portion is formed on the opposed end faces, and an elastic body is attached to the groove portion . The electric tool according to claim 1, wherein the inner gear case and the hammer case include a flange portion that fits into the housing .

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