JP6961764B2 - Power tools - Google Patents

Description

The present invention mainly relates to a power tool that is held in a hand to perform various operations.

For example, a multifunctional power tool called a multi-tool can perform various operations such as cutting, peeling, and grinding by swinging a tip tool attached to an output shaft at a constant angle at a high speed. Since the maximum number of swings of the output shaft reaches about 20,000 times per minute, there is a problem that the operability and workability of this type of power tool are impaired due to the occurrence of slight vibrations. Conventionally, various measures have been taken to suppress vibration of this type of power tool. Patent Document 1 below discloses a technique for suppressing the generation of vibration by attaching a weight to the other end side of the output shaft of an electric motor provided with an eccentric shaft for generating a swing motion on one end side in a multi-tool. ing. Further, Patent Document 2 discloses a technique of providing a thin-walled portion in the grip portion in a pistol-shaped electric tool having a grip portion to increase the drop resistance thereof.

Japanese Unexamined Patent Publication No. 2015-229223 Japanese Patent No. 4844409

However, for high-speed swinging tools such as multi-tools, it is desired to further suppress the generation of vibration. In particular, as the housing of this type of power tool, in addition to the housing integrally molded into a cylindrical shape, a resin housing having a half-divided structure divided into left and right may be used. In the case of a resin housing having a half-split structure, there is a problem that heat is generated as a result of the microvibration generated by the high-speed rocking motion causing the mating surfaces of the left and right split housings to vibrate (displace each other) in different phases and rub against each other. If the heat generation is large, it causes problems such as high vibration welding.

The present invention has been made in view of the above problems, and an object of the present invention is to solve the problem of heat generation by suppressing vibrations between mating surfaces of housings of a power tool that outputs high-speed rocking motion such as a multi-tool. And.

The above problems are solved by the following inventions. The first invention is a power tool having a housing in which two split housings are butted against each other and screwed together. In the first invention, the housing is provided with a means for regulating the relative displacement of the two divided housings in the separation direction, apart from the screw coupling.

According to the first invention, the housing is provided with means for regulating the displacement of the two split housings in the separation direction (relative displacement regulating means) separately from the screw coupling. By this relative displacement regulating means, resistance in the separation direction (separation resistance) is given between the two divided housings. Therefore, even if the screw coupling is loosened, the two split housings are held in a state of being coupled to each other by the separation resistance of the relative displacement regulating means.

The separation resistor that holds the two split housings in a butted state with each other also acts as a resistor that regulates the displacement of the two split housings in the butt plane direction (direction orthogonal to the separation direction). As a result of the relative displacement (vibration) of the two split housings in the butt surface direction being regulated by the separation resistance generated by the relative displacement regulating means, heat generation of the butt surfaces that are abutted against each other is prevented or suppressed. Can be done.

In the second invention, in the first invention, one of the two split housings is provided with a screw boss portion for tightening a screw for screw connection, and the other is provided with a boss receiving portion into which the tip of the screw boss portion is inserted. It is a power tool. In the second invention, the tip of the screw boss portion is press-fitted into the boss receiving portion as a relative displacement regulating means.

According to the second invention, the tip of the screw boss portion is press-fitted into the boss receiving portion, and a separation resistance acts between the two split housings, and as a result, the displacement (vibration) of the two split housings in the butt surface direction is suppressed. The heat generation is prevented or reduced. The press-fitting structure of the screw boss portion to the boss receiving portion is configured to set the inner peripheral dimension of the inner peripheral hole of the boss receiving portion to the inner diameter dimension that can be press-fitted with respect to the outer diameter dimension of the screw boss portion. Can be provided to set the inner diameter dimension so that it can be press-fitted.

A third invention is a power tool in which a press-fit pin provided in one of two divided housings is press-fitted into a press-fit hole provided in the other as a relative displacement regulating means in the first invention.

According to the third invention, a press-fit pin is press-fitted between the two split housings, and a separation resistance acts on the two split housings. The separation resistance also regulates the displacement of the two split housings in the butt surface direction, and as a result, heat generation due to vibration of the butt surface is prevented or suppressed.

A fourth invention, in the first invention, comprises a rib on one of the abutting surfaces of the two split housings that regulates relative displacement in the plane direction, and the other has a rib receiving portion into which the rib is inserted. It is a power tool. In the fourth invention, the rib is press-fitted into the rib receiving portion as a relative displacement regulating means.

According to the fourth invention, the rib is press-fitted into the rib receiving portion and a separation resistance acts between the two divided housings, and as a result, the displacement (vibration) of the two divided housings in the butt surface direction is suppressed and heat is generated. Is prevented or reduced.

A fifth aspect of the present invention is a power tool having a structure in which a protrusion is provided on a rib, the protrusion is elastically deformed with the rib receiving portion, and the rib is press-fitted into the rib receiving portion. ..

According to the fifth invention, the rib is press-fitted into the rib receiving portion by elastically deforming the protrusion. The rib press-fitting structure for the rib receiving portion has a structure in which a protrusion that elastically deforms is provided on the side surface of the rib, a structure in which the rib is formed in a tapered cross section and press-fitted into the rib receiving portion, and a groove width of the rib receiving portion. It can be press-fitted slightly smaller than the plate thickness of the rib, or an elastic member such as a rubber sheet can be sandwiched between the side surface of the rib and the side surface of the rib receiving portion to press-fit.

A sixth invention is a power tool in which, in the fourth or fifth invention, a plurality of ribs for regulating the relative displacement of the two divided housings in the butt surface direction are provided along the butt surface. In the sixth invention, the press-fitting structure as the relative displacement regulating means is set to at least three ribs.

According to the sixth invention, it is possible to regulate the relative displacement (vibration) of the divided housing in the butt surface direction over a wide range to more reliably prevent or reduce the generation of heat generation.

The seventh invention is the first to sixth inventions, wherein the output shaft swings at a constant angle around the axis and the output shaft is divided into two halves on the left and right sides with respect to the surface including the swing axis. A power tool with a housing.

According to the seventh invention, for example, the above-mentioned effect can be obtained for a housing having a left-right half-divided structure in a high-speed rocking tool called a multi-tool.

It is an overall side view of the power tool which concerns on embodiment of this invention. It is an overall top view of the power tool which concerns on embodiment of this invention. It is a cross-sectional view taken along the line (III)-(III) of FIG. In this figure, the split housing on the right side has been removed to show the entire internal structure. It is a side view which looked at the split housing on the left side from the inner surface side (right side). It is a side view which looked at the split housing on the right side from the inner surface side (left side). It is a figure which shows the relative displacement regulation means of 1st Embodiment. This figure is a cross-sectional view of the main body housing as viewed from the direction of arrow (VI)-(VI) in FIG. FIG. 6 is an exploded perspective view of FIG. This figure shows a state in which the housing is sliced including the relative displacement regulating means according to the first embodiment. It is a figure which shows the relative displacement regulation means of 2nd Embodiment. This figure is a cross-sectional view of the main body housing as viewed from the direction of arrow (VI)-(VI) in FIG. It is a figure which shows the relative displacement regulation means of 3rd Embodiment. This figure is a cross-sectional view of the main body housing as viewed from the direction of arrow (VI)-(VI) in FIG. FIG. 9 is an exploded perspective view of FIG. This figure shows a state in which the main body housing is sliced in a circle including the relative displacement regulating means according to the third embodiment. It is a figure which shows the relative displacement regulation means of 4th Embodiment. This figure is a cross-sectional view of the main body housing as viewed from the direction of arrow (VI)-(VI) in FIG. It is a cross-sectional view which is the part (XII) of FIG. 11 and shows the state of press-fitting of the rib with respect to the rib receiving part in an enlarged manner. FIG. 11 is an exploded perspective view of FIG. This figure shows a state in which the main body housing is sliced in a circle including the relative displacement regulating means according to the fourth embodiment. It is the (XIV) part of FIG. 13, and is the perspective view which shows the rib and its periphery in an enlarged manner. It is a figure which shows the relative displacement regulation means of 5th Embodiment. This figure is a cross-sectional view of the main body housing as viewed from the direction of arrow (VI)-(VI) in FIG. FIG. 15 is an exploded perspective view of FIG. This figure shows a state in which the main body housing is sliced in a circle including the relative displacement regulating means according to the fifth embodiment. It is a perspective view which shows the press-fitting rib of the protrusion type and the rib receiving part. It is a perspective view which shows the press-fitting rib of the ridge type and the rib receiving part. It is a perspective view which shows the press-fitting rib of a taper type and the rib receiving part. FIG. 5 is a cross-sectional view of the housing as viewed from the direction of the arrow (XX)-(XX) in FIG. FIG. 5 is a cross-sectional view of the housing as viewed from the direction of the arrow (XXI)-(XXI) in FIG. FIG. 5 is a cross-sectional view of the housing as viewed from the direction of the arrow (XXII)-(XXII) in FIG. FIG. 5 is a cross-sectional view of the housing as viewed from the direction of the arrow (XXIII)-(XXIII) in FIG. FIG. 5 is a cross-sectional view of the housing as viewed from the direction of the arrow (XXIV)-(XXIV) in FIG.

Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 24. As shown in FIGS. 1 to 3, in each embodiment, as the power tool 1, a multifunctional power tool generally called a multi-tool is illustrated. This power tool 1 has a configuration in which a tip tool attached to an output shaft is swung at a constant angle at high speed, and is used for various operations such as cutting a masonry board, peeling tiles, and grinding wood. .. In the following description, five embodiments will be described. Each embodiment has different characteristics regarding the coupling structure of the half-split housing, and the basic configuration of the housing and the power tool excluding the characteristic portion is common. Therefore, the schematic configuration of the power tool 1 will be described only with respect to the first embodiment, and the second and subsequent embodiments will be designated by the same reference numerals and the description thereof will be omitted.

The power tool 1 includes a tool body 10 having an electric motor 11 as a drive source, a mechanism 20 provided on the front side of the tool body 10, and a grip portion provided on the rear side of the tool body 10. 30 and a power supply unit 40 provided on the rear side of the grip unit 30 are provided. The power tool 1 has a configuration in which a mechanism portion 20, a tool main body portion 10, a grip portion 30, and a power supply portion 40 are connected in substantially series in order from the front side. Each of these parts 10 to 40 is housed in a substantially cylindrical housing 50 extending along the motor axis M. The housing 50 is a resin housing having a left-right half-split structure, and each embodiment is characterized by a combined structure of this half-split structure. Details of the housing 50 will be described later.

As shown in FIG. 3, the electric motor 11 of the tool body 10 is housed in a cylindrical motor case 11a. A cooling fan 11b attached to the motor shaft 11c is housed in the rear part of the motor case 11a. An oval exhaust window 11d is provided at the rear of the motor case 11a. In FIG. 3, the cooling fan 11b is visible through the exhaust window 11d. On the other hand, as shown in FIGS. 1, 4 and 5, a plurality of intake ports 50b are provided on the front side, the middle side, and the rear side surface of the housing 50 in the longitudinal direction. Further, a plurality of exhaust ports 50a are provided on the side surface of the housing 50 in the middle of the longitudinal direction and around the exhaust window 11d. When the cooling fan 11b is rotated by starting the electric motor 11, outside air is introduced into the motor case 11a through the intake port 50b of the housing 50 to cool the electric motor 11. The motor cooling air introduced into the motor case 11a is exhausted from the exhaust window 11d through the exhaust port 50a to the outside of the housing 50 by the rotation of the cooling fan 11b.

The electric motor 11 uses the battery pack 41 attached to the power supply unit 40 as a power source. The mechanism unit 20 is connected to the motor shaft 11c of the electric motor 11. The mechanism unit 20 has a configuration in which the drive shaft 22, the swing arm 23, and the output shaft 24 are rotationally supported inside the mechanism unit case 21. The drive shaft 22 is coupled to the motor shaft 11c. The drive shaft 22 is rotatably supported by the mechanical case 21 via bearings 22a and 22b. The drive shaft 22 is rotatably supported around the motor axis M. An eccentric shaft portion 22c that is eccentric with respect to the motor shaft line M is integrally provided at the front portion of the drive shaft 22. A drive roller 25 is attached to the eccentric shaft portion 22c.

Acting portions 23a of the swing arm 23 are slidably contacted on the left and right sides of the drive roller 25. The left and right actuating portions 23a are integrally provided at the rear portion of the swing arm 23. Both actuating portions 23a extend rearward in parallel at regular intervals from each other. The output shaft 24 is coupled to the front portion of the swing arm 23. The output shaft 24 is rotatably supported around the output axis P orthogonal to the motor axis M. The output shaft 24 is supported by the mechanical case 21 via upper and lower bearings 24a and 24b.

When the electric motor 11 is started, the drive shaft 22 rotates around the motor axis M. When the drive shaft 22 rotates around the motor axis M, the eccentric shaft portion 22c revolves around the motor axis M. Therefore, the drive roller 25 revolves around the motor axis M. Of the revolving motion of the drive roller 25, the lateral displacement is transmitted to the swing arm 23 via the left and right actuating portions 23a, whereby the swing arm 23 swings around the output axis P at a constant angle. When the swing arm 23 swings around the output axis P, the output shaft 24 swings around the output axis P at a constant angle.

The lower side of the output shaft 24 projects downward from the lower surface of the mechanical case 21. A tool holder 26 is provided below the output shaft 24. The tip tool T is attached to the lower part of the output shaft 24 by tightening and sandwiching the fixing screw 26a into the tool holder 26. The tip tool T is attached so as to extend forward (in a direction orthogonal to the output axis P) from the lower part of the output shaft 24. As shown in FIG. 1, as the tip tool T, a strip-shaped saw tooth (cut and sew) is attached to the output shaft 24. When the tip tool T is swung around the output axis P at a constant angle at high speed, the tip portion of the tip tool T is used to cut out a corner of wood.

A start switch 12 that slides in the front-rear direction is provided on the upper surface of the portion of the housing 50 that corresponds to the tool body portion 10 (main body portion housing 51). As shown in FIG. 3, an operating lever 13 is integrally provided on the lower surface of the start switch 12. The actuating lever 13 extends rearward along the inner surface of the housing 50. The rear portion of the operating lever 13 is connected to the main switch 14 built in the grip portion 30. When the start switch 12 is slid forward (on operation), the main switch 14 is turned on and the electric motor 11 is started. When the start switch 12 is slid to the rear side (off operation), the main switch 14 is turned off and the electric motor 11 is stopped.

The grip portion 30 is a portion to be gripped by the user with one hand, and is located on the rear side of the tool body portion 10. Of the housing 50, the portion corresponding to the grip portion 30 (grip portion housing 53) has a thickness and a shape that can be easily gripped by the user with one hand. A speed controller 31 for adjusting the output rotation speed of the electric motor 11 is incorporated in the rear portion of the grip portion 30. The speed controller 31 is provided with a rotation-operated adjustment dial 31a. As shown in FIG. 2, the upper portion of the adjustment dial 31a protrudes from the window portion 53a provided on the upper surface of the grip portion housing 53. On the front side of the window portion 53a, a triangular pointer 53b indicating the adjusted rotation speed is displayed. The window portion 53a is provided at the bottom of a rectangular mortar-shaped recess 53c. The upper portion of the adjustment dial 31a protrudes from the window portion 53a within a range that does not protrude from the recess 53c. This prevents inadvertent erroneous operation of the adjustment dial 31a.

A power supply unit 40 is provided at the rear portion of the grip unit 30. A portion of the housing 50 corresponding to the power supply portion 40 (power supply portion housing 54) is integrally provided from the rear portion of the grip portion housing 53 so as to project downward while being inclined diagonally rearward. The power supply housing 54 contains a main controller 43 that mainly controls the operation of the electric motor 11. Although omitted in the drawing, the main controller 43 has a configuration in which a control board including a motor control circuit and a power supply circuit is housed in a case having a shallow rectangular bottom and molded with resin.

A terminal block 42 having positive and negative terminal plates 42a is installed on the rear surface side of the main controller 43. A pair of left and right rail receiving portions 44 for guiding the battery pack 41 are provided on the left and right sides of the terminal block 42. The battery pack 41 is a slide-mounted lithium-ion battery in which a plurality of cells are housed in a case, and in this embodiment, for example, a battery having an output of 10.8 V is used. A pair of left and right guide rails 41a that are engaged with the rail receiving portion 44 on the power supply portion 40 side are provided on the front surface of the battery pack 41. Positive and negative terminal receiving portions are arranged between the left and right guide rails 41a.

The battery pack 41 can be attached to the power supply unit 40 by sliding it downward, and can be removed from the power supply unit 40 by sliding it upward. Although not visible in the figure, the battery pack 41 is provided with a claw portion for locking the attachment state to the power supply unit 40. On the other hand, as shown in FIG. 2, an unlock button 41b is provided on the upper surface of the battery pack 41 to displace the claw portion to the unlock side to release the mounting lock state. The battery pack 41 can be used repeatedly by removing it from the power supply unit 40 and charging it with a separately prepared charger.

As described above, the power tool 1 includes a housing 50 having a substantially cylindrical shape extending along the motor axis M and having a left-right half-divided structure. The housing 50 has a configuration in which the left and right split housings 50L and 50R are butted against each other and screwed together. The front part of the housing 50 corresponds to the mechanism part housing 52 of the mechanism part 20, the rear side corresponds to the main body part housing 51 of the tool body part 10, the rear side corresponds to the grip part housing 53 of the grip part 30, and the rear part corresponds to the power supply. It corresponds to the power supply unit housing 54 of the unit 40.

As shown in FIG. 2, the split housing 50L on the left side and the split housing 50R on the right side are butted against each other by the butt surface J to form a cylindrical housing 50. The left split housing 50L divided left and right by the butt surface J is shown in FIG. 4, and the right split housing 50R is shown in FIG. FIG. 4 shows a state in which the left split housing 50L is viewed from the inner surface side, and FIG. 5 shows a state in which the right split housing 50R is viewed from the inner surface side. Both the left and right divided housings 50L and 50R are provided with butt surfaces J mainly along the upper edge portion and the lower edge portion thereof.

The outer peripheral surfaces of the left and right split housings 50L and 50R are coated with an elastic resin layer 55 mainly for the purpose of preventing slippage and mitigating impact when dropped. In FIGS. 4 and 5, the elastic coating layer is shaded to be clearly distinguished from the butt surface J. The butt surface J is provided with ribs 56 for the purpose of positioning the left and right divided housings 50L and 50R in the butt surface direction (mainly in the vertical direction with respect to each other). The rib 56 is provided on the butt surface J of the left split housing 50L. The ribs 56 have a thin plate shape, and are provided at a plurality of positions along the abutting surface J at appropriate intervals. The ribs 56 are provided at five locations on the upper edge side of the left split housing 50L and at two locations (7 locations in total) on the lower edge side.

A groove hole 58 is provided in the abutting surface J of the split housing 50R on the right side corresponding to each of the ribs 56. Each groove 58 is formed with a groove width and length into which opposite ribs 56 can be inserted. As shown in FIGS. , They are screwed together in this positioning state. Further, by inserting the rib 56 into each groove hole 58, it is possible to regulate or prevent the displacement of the left and right divided housings 50L and 50R in the butt surface J direction due to vibration or the like.

Auxiliary ribs 57 and 59 are provided on the lower edges of the left and right split housings 50L and 50R, respectively. As shown in FIG. 4, two auxiliary ribs 57 are provided on the butt surface J on the lower edge side of the left split housing 50L. As shown in FIG. 5, two auxiliary ribs 59 are provided on the butt surface J on the lower edge side of the split housing 50R on the right side. The auxiliary ribs 57 and 59 are formed long along the abutting surface J. The auxiliary ribs 57 and 59 on the front side are provided along the abutting surface J of the portion corresponding to the main body housing 51. The auxiliary ribs 57 and 59 on the rear side are provided along the abutting surface J in the range from the grip portion housing 53 to the power supply portion housing 54.

As shown in FIGS. Positioning and misalignment prevention are mainly performed in the vertical direction in the butt surface J direction of the 50L and 50R. The configuration in which the auxiliary ribs 57 and 59 on the lower edge side of the left and right split housings 50L and 50R are overlapped with each other in the plate thickness direction and positioned is the same in the second and subsequent embodiments described later.

As shown in FIG. 1, the left and right split housings 50L and 50R are connected to each other by a total of nine screw connecting portions 60. Each screw coupling portion 60 is composed of a screw boss portion 61 on the left split housing 50L side, a boss receiving portion 62 on the right split housing 50R side, and a screw 63 for housing coupling.

As shown in FIG. 4, nine screw boss portions 61 having screw holes 61a for tightening the screws 63 are provided on the inner surface of the left split housing 50L. Each screw boss portion 61 is provided so as to protrude from the inner surface side of the left split housing 50L toward the right split housing 50R side (front side in the drawing). A screw hole 61a having a constant depth is provided at the tip on the protruding side. Three screw boss portions 61 are provided on the inner surface of the portion corresponding to the mechanical portion housing 52 of the split housing 50L on the left side, and two screw boss portions 61 are provided on the inner surface of the portion corresponding to the main body portion housing 51. Two screw boss portions 61 are provided on the inner surface of the portion corresponding to the grip portion housing 53, and two screw boss portions 61 are provided on the inner surface of the portion corresponding to the power supply portion housing 54. A case fixing portion 64 having screw holes 64a for fixing the mechanical portion case 21 in addition to the three screw boss portions 61 on the inner surface of the portion corresponding to the mechanical portion housing 52 of the split housing 50L on the left side. Are provided in three places.

As shown in FIG. 5, a total of nine boss receiving portions 62 are provided on the inner surface of the right split housing 50R corresponding to the screw boss portions 61 of the left split housing 50L. Each boss receiving portion 62 has a cylindrical shape into which the tip end portion of the screw boss portion 61 can be inserted. An insertion hole 62a for inserting the screw 63 is provided at the center of the bottom of each boss receiving portion 62. By inserting the screw 63 into the insertion hole 62a from the right split housing 50R side and tightening the screw 63 into the screw hole 61a on the left split housing 50L side, the left split housing 50L and the right split housing 50R are in a state of being butted against each other. The housing 50 is formed by being combined with. If the screws 63 are removed from all of the nine screw joints 60 in total, the left split housing 50L and the right split housing 50R can be separated from each other.

Between the left split housing 50L and the right split housing 50R, means for regulating displacement in the direction of mutual separation (relative displacement regulating means 70) are provided. Various embodiments of the relative displacement regulating means 70 will be described below. As shown in FIGS. 5 to 7, the relative displacement regulating means 71 of the first embodiment has a configuration in which a press-fitting protrusion 71a is provided on the inner peripheral surface of the boss receiving portion 62. The press-fitting protrusion 71a is provided in the upper screw coupling portion 60 of the two screw coupling portions 60 in the portion corresponding to the grip portion housing 53 of the right split housing 50R. It is assumed that the rubbing (vibration) between the abutting surfaces J of the left and right split housings 50L and 50R is the largest in the vicinity of the upper screw joint portion 60, and in the third embodiment, the relative displacement regulating means 70 is used for the portion. It is set.

In the upper screw coupling portion 60, four press-fitting protrusions 71a are provided on the inner peripheral surface of the boss receiving portion 62 at quadrant positions in the circumferential direction. Due to the press-fitting protrusion 71a, the inner diameter of the upper boss receiving portion 62 is smaller than the inner diameter of the other eight boss receiving portions 62, and the tip of the screw boss portion 61 on the left split housing 50L side is inserted. It is set to a size that can be press-fitted.

Therefore, in a state where the left and right split housings 50L and 50R are mutually connected, the screw boss portion 61 is the inner peripheral hole of the boss receiving portion 62 in the screw connecting portion 60 on the upper side of the portion corresponding to the grip portion housing 53. In the other eight screw coupling portions 60, the screw boss portion 61 is inserted into the inner peripheral hole of the boss receiving portion 62 without resistance. In this way, with respect to the screw coupling portion 60 at one of the nine locations, the screw boss portion 61 is press-fitted into the boss receiving portion 62 by the press-fitting protrusion 71a, and the resistance in the separation direction between the left and right split housings 50L and 50R ( Separation resistance) is given. Due to this separation resistance, the left and right split housings 50L and 50R are held in a butt-butting state even if the screws 63 of all the screw joints 60 are loosened and removed. In the present embodiment, the separation resistance (butting state holding force) by the press-fitting protrusion 71a is, for example, when one split housing 50L (50R) is gripped and the housing 50 is held in a horizontal posture, the other split housing 50R is held. (50L) is set to a holding force that does not separate (do not fall) due to its own weight. In the first embodiment, the overhanging dimensions of the four press-fitting protrusions 71a toward the inner peripheral side are appropriately set in order to obtain the separation resistance.

In this way, the separation resistance that holds the left and right split housings 50L and 50R in a mutually abutted state (coupled state) is the displacement of the two split housings 50L and 50R in the butt surface J direction (direction orthogonal to the separation direction). It also acts as a resistance to regulate. The separation resistance generated by the press-fitting protrusion 71a (relative displacement regulating means 70) regulates the relative displacement (vibration) of the left and right split housings 50L and 50R in the butt surface J direction. It is possible to prevent or suppress the heat generation of the above.

According to the relative displacement regulating means 71 of the housing 50 according to the first embodiment described above, one of the nine screw coupling portions 60 for connecting the left and right split housings 50L and 50R is the screw coupling portion 60. The screw boss portion 61 is press-fitted to the inner peripheral side of the boss receiving portion 62. Due to this press fitting, an appropriate resistance (separation resistance) is provided between the left and right divided housings 50L and 50R in the separation direction. As a result of the relative displacement of the left and right divided housings 50L and 50R in the butt surface J direction being regulated by this separation resistance, rubbing (vibration) between the butt surfaces J is suppressed and conventional heat generation is suppressed.

FIG. 8 shows the relative displacement regulating means 72 of the second embodiment. The relative displacement regulating means 72 of the second embodiment has a configuration in which a cylindrical rubber bush 72a is fitted on the inner peripheral side of the boss receiving portion 62 instead of the four press-fitting protrusions 71a. By press-fitting the tip of the screw boss portion 61 into the inner peripheral side of the rubber bush 72a, the left and right split housings 50L and 50R have separation resistance for one screw coupling portion 60.

As described above, the relative displacement regulating means 72 (rubber bush 72a) of the second embodiment also has a separation resistance between the left and right divided housings 50L and 50R. As a result of the relative displacement of the left and right divided housings 50L and 50R in the butt surface J direction being regulated by this separation resistance, rubbing (vibration) between the butt surfaces J is suppressed and heat generation is suppressed.

9 and 10 show the relative displacement regulating means 73 of the third embodiment. The relative displacement regulating means 73 of the third embodiment is configured to have a separation resistance between the left and right split housings 50L and 50R by using the press-fit pin 73a. In the third embodiment, the press-fit pin 73a is press-fitted between the abutting surfaces J along the upper screw coupling portion 60 of the grip portion housing 53 as well. As a result of the press-fitting pin 73a having a separation resistance between the left and right split housings 50L and 50R, rubbing between the butt surfaces J of both split housings 50L and 50R is suppressed and heat generation is suppressed.

11 to 14 show the relative displacement regulating means 74 of the fourth embodiment. The relative displacement regulating means 74 of the fourth embodiment separates the split housings 50L and 50R between the split housings 50L and 50R by press-fitting the rib 56 of the split housing 50L on the left side into the groove hole 58 of the split housing 50R on the right side instead of the press-fit pin 73a. It is configured to have resistance. In the fourth embodiment, a rubber sheet 74a is attached to the rib 56 to secure a required press-fitting allowance. The rubber sheet 74a is attached along both the inner and outer side surfaces of the rib 56. As shown in FIGS. 11 and 12, ribs 56 to which rubber sheets 74a are attached are press-fitted into the groove holes 58 along both side surfaces. By press-fitting the rib 56 into the groove hole 58, a separation resistance is provided between the left and right split housings 50L and 50R, and relative displacement (vibration, rubbing) between the butt surfaces J of both split housings 50L and 50R is suppressed. As a result, fever at the same site is suppressed.

15 and 16 show the relative displacement regulating means 75 of the fifth embodiment. The relative displacement regulating means 75 of the fifth embodiment has a configuration in which the plate thickness of the rib 56 of the split housing 50L on the left side of the grip portion housing 53 is increased to secure a necessary press-fitting allowance. In the figure, a reference numeral W is attached to the rib 56 whose plate thickness is increased by adding a press-fitting allowance. In the fifth embodiment, the press-fitting allowance is secured by forming the rib 56W plate thickness itself to be large, instead of attaching the rubber sheet 74a or the like to secure the press-fitting allowance as in the fourth embodiment. By press-fitting the rib 56W along the groove hole 58, a separation resistance is provided between the left and right divided housings 50L and 50R. Therefore, also in the fifth embodiment, the relative displacement (vibration, rubbing) between the butt surfaces J of the two divided housings 50L and 50R is suppressed, and the heat generation is suppressed.

In order to press-fit the positioning rib 56 provided on the butt surface J into the groove hole 58 as described above, a rubber sheet 74a is attached (fourth embodiment), or the plate thickness of the rib 56W itself is increased (first). 5 Embodiment) In addition to the configuration, the press-fitting structure (relative displacement regulating means) shown in FIGS. 17 to 19 can be adopted. The press-fitting structure shown in FIG. 17 is configured to provide a plurality of protrusions 56a on one side or both side surfaces of the rib 56 to secure a necessary press-fitting allowance. By press-fitting the rib 56 into the groove hole 58 by the protrusion 56a, a separation resistance is provided between the left and right split housings 50L and 50R, vibration (rubbing) between the butt surfaces J is suppressed, and heat is generated at the same portion. Is suppressed. In addition to the configuration in which the number of protrusions 56a is four as shown in the drawing, a configuration in which a larger number of protrusions are provided, or a configuration in which one protrusion on one side secures a necessary press-fitting allowance may be used.

Further, the required press-fitting allowance can be secured by providing one protrusion 56b on one side or both side surfaces of the rib 56 as shown in FIG. 18 instead of the protrusion 56a. The ridges 56b may be provided on one side as shown in the drawing, may be provided on both side surfaces, or may be provided on one side with a plurality of ridges to secure a necessary press-fitting allowance.

FIG. 19 shows yet another form of press-fitting structure (relative displacement regulating means). The press-fitting structure shown in FIG. 19 has a structure in which a tapered rib 56T is press-fitted into the groove hole 58 to provide a split resistance between the left and right split housings 50L and 50R. The plate thickness of the rib 56T continuously changes in the direction in which the plate thickness decreases toward the overhanging tip side. By press-fitting the tapered rib 56T into the groove hole 58, a separation resistance is provided between the left and right divided housings 50L and 50R to suppress vibration (rubbing) between the butt surfaces J and suppress heat generation. Can be done.

As described above, the left and right split housings 50L and 50R have relative displacement regulating means 71, 72, 73, 74 as means for suppressing relative displacement (rubbing) between the abutting surfaces J and suppressing heat generation. , 75 have been devised to have mutual separation resistance. Similar to the first embodiment, even when the press-fitting structure of the second to fifth embodiments or the press-fitting structure shown in FIGS. 17 to 19 is adopted, the separation resistance (holding the butt state) between the left and right split housings 50L and 50R is maintained. The force) is held so that, for example, when one split housing 50L (50R) is gripped and the housing 50 is held in a horizontal posture, the other split housing 50R (50L) is not separated (does not fall) due to its own weight. By setting the force, the vibration (rubbing) between the butt surfaces J can be efficiently reduced, and thus heat generation can be suppressed.

Further, in the first embodiment, the configuration in which the relative displacement regulating means 71 is provided for the boss receiving portion 62 on the upper side of the grip portion housing 53 is illustrated, but the bosses of other parts of the total of nine boss receiving portions 62 are illustrated. The receiving portion 62 or the boss receiving portions 62 at a plurality of locations may be provided with press-fitting protrusions 71a to provide separation resistance. This point is the same for the subsequent press-fitting structures of the second embodiment, and a configuration in which a press-fitting allowance is provided in the rib 56 on the upper edge side of the grip portion housing 53 or a press-fitting pin 73a is driven in the vicinity of the rib 56 is exemplified. However, out of the total of 7 ribs 56, the press-fitting structure exemplified for the other ribs 56 or the ribs 56 at a plurality of locations can be applied.

Further, although the configuration for securing the press-fitting allowance in the rib 56 has been illustrated, a press-fitting allowance for press-fitting the rib 56 may be provided on the groove hole 58 side.

The power tool 1 of each embodiment is provided with various vibration countermeasures and impact mitigation countermeasures such as when dropped, in addition to the various types of relative displacement regulating means exemplified above. FIG. 20 shows a device for suppressing the transmission of vibration from the mechanism unit 20 to the housing 50. A first buffer portion 81 for suppressing vibration of the mechanism portion case 21 is provided on the inner front portion of the left and right split housings 50L and 50R at a portion corresponding to the mechanism portion housing 52 of the housing 50. As shown in the figure, the first buffer portion 81 is symmetrically provided at a portion corresponding to the periphery of the mechanical portion case 21 of the left and right divided housings 50L and 50R. As shown in FIGS. 5 and 20, the first buffer portion 81 has four buffer protrusions 81a on each side. The four cushioning protrusions 81a are arranged in parallel at appropriate intervals in the circumferential direction, and are formed long in the front-rear direction. Each cushioning protrusion 81a is integrally molded by means such as two-color molding when the split housing 50R is molded using the elastic resin as a material like the elastic resin layer 55 on the outer surface side.

In the assembled state of the mechanism portion 20 with respect to the housing 50, each of the above-mentioned cushioning protrusions 81a is pressed against the outer surface of the mechanism portion case 21. The mechanism portion case 21 is held in the housing 50 via the left and right first buffer portions 81. The vibration generated in the mechanism portion 20 by the first buffer portion 81, which is mainly generated by the swinging operation of the swinging arm 23, is absorbed, and the vibration of the housing 50 is reduced. By reducing the vibration of the left and right divided housings 50L and 50R by the first buffer portion 81, the rubbing of the butt surface J is reduced, and thus heat generation at the same portion is suppressed.

As shown in FIG. 21, a second buffer portion 82 for absorbing the vibration of the electric motor 11 is provided on the inner surface of the left and right split housings 50L and 50R at a portion corresponding to the main body housing 51 of the housing 50. The second cushioning portion 82 has a pair of left and right rubber sheets 82a provided along the inner surfaces of the left and right divided housings 50L and 50R. When the electric motor 11 is assembled to the housing 50, a pair of left and right rubber sheets 82a having appropriate elasticity are pressed against the outer peripheral surface of the motor case 11a, so that the vibration generated by the electric motor 11 is absorbed and the housing 50 is absorbed. Vibration is reduced. By suggesting vibration of the left and right divided housings 50L and 50R by the second buffer portion 82, the rubbing of the butt surface J is reduced, and thus heat generation at the same portion is suppressed.

As shown in FIG. 22, a ventilation seal portion 83 for closing a gap between the left and right split housings 50L and 50R and the outer surface of the motor case 11a is provided on the inner surface of the left and right split housings 50L and 50R at a portion corresponding to the main body housing 51 of the housing 50, respectively. There is. The ventilation seal portion 83 is integrally provided along the inner surfaces of the left and right split housings 50L and 50R.

On the front side of the exhaust window 11d, the gap between the inner surfaces of the left and right split housings 50L and 50R and the outer surface of the motor case 11a is closed by the left and right ventilation seal portions 83, so that the motor is cooled discharged from the exhaust window 11d. The wind (exhaust) does not flow to the front side and is sucked into the motor case 11a again, and in this respect, the exhaust efficiency of the electric motor 11 can be improved, and eventually the cooling efficiency of the electric motor 11 can be improved. Can be done. By arranging a similar ventilation seal portion on the rear side of the exhaust window 11d, the exhaust efficiency and the cooling efficiency can be further improved.

When the elastic resin layer 55 coated on the outer surface of the housing 50 is molded, the left and right ventilation seal portions 83 pour the molten resin material into the inner surface side through the resin pouring ports 50c provided in each of the left and right divided housings 50L and 50R. It is molded. Therefore, the left and right ventilation seal portions 83 are simultaneously molded with the same elastic material as the elastic resin layer 55 on the outer surface side.

As shown in FIG. 23, on the inner surface of the left and right split housings 50L and 50R at a portion corresponding to the rear portion of the main body housing 51 of the housing 50, a fourth buffer for reducing the vibration of the speed controller 31 and mitigating the impact is provided. A unit 84 is provided. The fourth shock absorber 84 includes a pair of left and right shock absorbers 84a that come into contact with the left and right side portions of the speed controller 31. By supporting the speed controller 31 inside the housing 50 via the shock absorbers 84a that are in contact with the left and right side portions, it is possible to reduce the vibration to the speed controller 31, and also to give an impact such as when dropped. This can be alleviated, thereby increasing the durability of the speed controller 31 and preventing its malfunction and the like.

Similar to the ventilation seal portion 83, the cushioning body 84a of the fourth cushioning portion 84 is provided with resin pouring ports in the left and right divided housings 50L and 50R, respectively, when the elastic resin layer 55 coated on the outer surface of the housing 50 is molded. It is molded by pouring a molten resin material into the inner surface side after passing through 50d. Therefore, the left and right shock absorbers 84a are simultaneously molded with the same elastic material as the elastic resin layer 55 on the outer surface side, respectively.

As shown in FIG. 24, a fifth buffer portion 85 for reducing vibration of the main controller 43 is provided on the inner surfaces of the left and right split housings 50L and 50R at a portion corresponding to the power supply unit housing 54 of the housing 50. .. The fifth shock absorber 85 includes a total of four shock absorbers 85a that come into contact with the vicinity of the corners of the main controller 43. Each of the buffers 85a has a block shape. Like the ventilation seal portion 83 and the fourth buffer portion 84, the shock absorber 85a of the fifth buffer portion 85 is also molded at the same time through the resin pouring port when the elastic resin layer 55 is molded. By supporting the main controller 43 inside the housing 50 via the shock absorbers 85a that are in contact with the left and right side portions, it is possible to reduce the vibration to the main controller 43, and also to give an impact such as when dropped. This can be alleviated, thereby increasing the durability of the main controller 43 and preventing its malfunction or the like.

Each of the embodiments described above can be further modified and implemented. For example, in the first and second embodiments, the screw boss portion 61 is press-fitted into the insertion hole 62a of the boss receiving portion 62 for the screw coupling portion 60 on the upper side of the grip portion housing 53, but other screw coupling portions are illustrated. The press-fitting structure exemplified for 60 can be applied, and the press-fitting structure exemplified for the screw coupling portions 60 at a plurality of locations (for example, three locations) can be applied, not limited to one location.

Further, in the first embodiment, a press-fitting protrusion 71a is provided in the insertion hole 62a of the boss receiving portion 62, and in the second embodiment, the screw boss portion 61 is press-fitted by interposing a rubber bush 72a in the insertion hole 62a. However, as a configuration in which a press-fitting allowance is directly set in the external dimensions of the screw boss portion 61 and press-fitted into the insertion hole 62a of the boss receiving portion 62, or a configuration in which the screw boss portion 61 is provided in a tapered pin shape and press-fitted into the insertion hole 62a. May be good.

Further, in the third embodiment, the configuration in which the press-fit pin 73a is press-fitted between the split housings 50L and 50R in the vicinity of the screw joint portion 60 on the upper side of the grip portion housing 53 is illustrated, but the split housing 50L is formed at other parts or a plurality of places. A similar press-fit pin may be press-fitted between the 50R and 50R to provide a separation resistance.

Further, in the fourth and fifth embodiments, the configuration in which the rib 56 on the upper edge side of the grip portion housing 53 is press-fitted into the groove hole 58 is illustrated, but the groove hole 58 is provided for the rib 56 at another portion or the rib 56 at a plurality of locations. It may be configured to have a separation resistance between the divided housings 50L and 50R by press-fitting into. The point is that the relative displacement regulating means 70 illustrated at the appropriate location is applied to the portion where the friction (vibration) between the butt surfaces J is expected to be the largest, and the divided housings 50L and 50R are separated appropriately. By providing resistance, rubbing between the butt surfaces J in the butt surface direction can be reduced and heat generation can be suppressed.

Further, although a multifunctional power tool called a multi-tool has been exemplified as a power tool, it can be widely applied to other power tools such as a vibration drill, a screw tightening machine, and a cutting machine. The power source of the power tool can be applied not only to the illustrated battery pack (rechargeable type) but also to the power tool using a commercial 100V AC power source as a power source.

Further, as the housing 50 of the power tool 1, a housing 50 having a half-split structure in which the left and right split housings 50L and 50R are butted against each other is illustrated. Rubbing (vibration) between the butt surfaces by applying the relative displacement regulating means 70 illustrated to the butt surface between the main body housing and the butt surface of the grip portion housing having a left and right half structure in a pistol-shaped power tool. Can be reduced to suppress heat generation.

1 ... Power tool 10 ... Tool body 11 ... Electric motor 11a ... Motor case, 11b ... Cooling fan, 11c ... Motor shaft, 11d ... Exhaust window M ... Motor shaft line 12 ... Start switch 13 ... Operating lever 14 ... Main switch 20 ... Mechanical unit 21 ... Mechanical unit case 22 ... Drive shaft, 22a, 22b ... Bearing, 22c ... Eccentric shaft unit 23 ... Swing arm, 23a ... Acting unit 24 ... Output shaft, 24a, 24b ... Bearing P ... Output axis 25 ... Drive Roller 26 ... Tool holder, 26a ... Fixing screw T ... Tip tool 30 ... Grip part 31 ... Speed controller, 31a ... Adjustment dial 40 ... Power supply part 41 ... Battery pack, 41a ... Guide rail 42 ... Terminal block, 42a ... Terminal plate 43 ... Main controller 44 ... Rail bearing 50 ... Housing (left and right half structure)
50a ... Exhaust port, 50b ... Intake port, 50c, 50d ... Resin pouring port 50L ... Split housing (left side)
50R ... Split housing (right side)
J ... Butting surface 51 ... Main body housing 52 ... Mechanical housing 53 ... Grip housing 53a ... Window, 53b ... Pointer, 53c ... Recess 54 ... Power supply housing 55 ... Elastic resin layer 56 ... Rib 56a ... Protrusion, 56b ... Protrusion 57 ... Auxiliary rib 56W ... Rib (with press-fitting allowance)
56T ... Rib (tapered type)
58 ... Groove hole 59 ... Auxiliary rib 60 ... Screw coupling part 61 ... Screw boss part, 61a ... Screw hole 62 ... Boss receiving part 63 ... Screw, 63a ... Screw hole 64 ... Case fixing part, 64a ... Screw hole 70 ... Relative displacement Regulatoring means 71 ... Relative displacement regulating means (first embodiment), 71a ... Press-fitting protrusion 72 ... Relative displacement regulating means (second embodiment), 72a ... Rubber bush 73 ... Relative displacement regulating means (third embodiment), 73a ... Press-fit pin 74 ... Relative displacement regulating means (fourth embodiment), 74a ... Rubber sheet 75 ... Relative displacement regulating means (fifth embodiment)
81 ... 1st buffer, 81a ... Buffer protrusion 82 ... 2nd buffer, 82a ... Rubber sheet 83 ... Ventilation seal 84 ... 4th buffer, 84a ... Buffer 85 ... 5th buffer, 85a ... Buffer

Claims (13)

A power tool that uses an electric motor as a drive source.
An output shaft that swings at a constant angle around an axis orthogonal to the motor axis of the electric motor,
A tip tool attached to the lower part of the output shaft in the axial direction,
It has a cylindrical housing that extends along the motor axis and is partly a grip housing that the user grips.
In the housing, two divided housings divided to the left and right with respect to the surface including the swing axis of the output shaft are butted against each other and are screwed together at a plurality of screw connecting portions.
Of the plurality of screw coupling portions, the screw coupling portion on the upper side of the grip portion housing and on the side opposite to the tip tool in the swing axis direction of the output shaft tightens the screw coupling screw. The screw boss portion to be inserted, the cylindrical boss receiving portion into which the tip of the screw boss portion is inserted, and the boss receiving portion of the screw boss portion provided between the screw boss portion and the boss receiving portion. A power tool having a regulating part for regulating the radial displacement with respect to the other threaded joints more than other threaded joints. The power tool according to claim 1, wherein the screw coupling portion having the regulation portion is arranged above the screw coupling portion having no regulation portion. The power tool according to claim 1 or 2, wherein the tip of the screw boss portion is press-fitted into the boss receiving portion, and the radial displacement of the screw boss portion with respect to the boss receiving portion is the other screw coupling portion. More regulated power tools. The power tool according to any one of claims 1 to 3, wherein the power tool has the restricting portion on the inner circumference of the boss receiving portion. The power tool according to claim 4, wherein the power tool has a plurality of regulating protrusions provided on the inner peripheral surface of the boss receiving portion at positions equally divided in the circumferential direction as the regulating portion. The power tool according to any one of claims 1 to 5, wherein the radial direction of the screw boss portion with respect to the boss receiving portion coincides with the surface direction of the mutual abutting surface of the divided housing. A power tool that uses an electric motor as a drive source.
An output shaft that rotates around an axis orthogonal to the motor axis of the electric motor, and
A tip tool attached to the lower part of the output shaft in the axial direction,
It has a cylindrical housing that extends along the motor axis and is partly a grip housing that the user grips.
In the housing, two divided housings divided into left and right are abutted against each other and connected at a plurality of joint portions, and the joint portion includes a boss portion on one of the two divided housings and the other. Is provided with a boss receiving portion into which the tip of the boss portion is inserted.
At least one of the coupling portions provided on the upper side opposite to the tip tool in the axial direction of the output shaft is provided between the boss portion and the boss receiving portion, and the boss portion is said to have the same portion. A power tool that has a regulating part to regulate the displacement with respect to the boss receiving part more than other joints. The power tool according to claim 7, wherein the joint portion having the regulation portion is a power tool provided in the grip portion housing. The power tool according to claim 7 or 8, wherein the coupling portion having the regulation portion is on the upper side of the coupling portion having no regulation portion, which is opposite to the tip tool in the axial direction of the output shaft. Power tool provided in. A power tool that uses an electric motor as a drive source.
An output shaft that rotates around an axis orthogonal to the motor axis of the electric motor, and
A tip tool attached to the lower part of the output shaft in the axial direction,
It has a cylindrical housing that extends along the motor axis and is partly a grip housing that the user grips.
In the housing, two divided housings divided into left and right are abutted against each other and are screw-coupled at a plurality of screw-joining portions.
In order to regulate the mutual displacement of the two split housings in the vicinity of the screw joint portion on the upper side of the grip portion housing or the screw joint portion on the upper side of the plurality of screw joint portions as compared with other portions. Power tool with the regulation part of. The power tool according to claim 10, wherein the regulation unit is provided on the side opposite to the tip tool in the axial direction of the output shaft. The power tool according to any one of claims 7 to 11, wherein the output shaft swings at a constant angle around an axis orthogonal to the motor axis of the electric motor. The power tool according to any one of claims 7 to 12, wherein the housing is divided into left and right along a surface including an axis of the output shaft.

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