JP7377687B2 - Work tools - Google Patents

Description

The present invention relates to a work tool that performs machining work on a workpiece by swinging a tip tool.

2. Description of the Related Art Work tools (so-called vibrating tools) are known that perform machining work on a workpiece by swinging a tip tool attached to the lower end of a spindle. In such a power tool, vibration occurs as the tip tool swings. Therefore, for example, Patent Document 1 discloses a power tool that includes an inner housing and an outer housing that are elastically connected to each other so as to be movable relative to each other for vibration isolation. In this power tool, the inner housing is provided with an air intake port and an air exhaust port for cooling the motor.

Unexamined Japanese Patent Publication No. 2017-144538

In the inner housing of the power tool described above, the intake port is provided at the rear end, and the exhaust port is provided at the front end. A space (gap) exists between the elastically connected inner housing and outer housing. Therefore, air heated by the motor and flowing out from the exhaust port may flow into the inner housing from the air intake port at the rear end through this space, reducing cooling efficiency.

SUMMARY OF THE INVENTION An object of the present invention is to provide a technique that contributes to suppressing a decrease in cooling efficiency of a motor in a power tool including an inner housing and an outer housing.

According to one aspect of the present invention, a working tool is provided that performs machining work on a workpiece by swinging a tip tool. This power tool includes a motor, a spindle, an inner housing, an outer housing, and a partition wall.

The spindle is rotatably supported around a drive shaft. The spindle is configured to oscillate a removably attached tip tool by the power of the motor. The inner housing houses the motor and the spindle. The inner housing also has at least one intake port and at least one exhaust port. The outer housing accommodates the inner housing. Further, the outer housing is elastically connected to the inner housing so as to be movable relative to the inner housing. The partition wall defines a space between the inner housing and the outer housing between at least one exhaust port and at least one intake port.

In the power tool of this aspect, a space (gap) exists between the inner housing and the outer housing, which are elastically connected to be movable relative to each other. The air that enters the inner housing via the at least one inlet opens into this space through the at least one outlet after cooling the motor. On the other hand, the partition wall provided between the at least one exhaust port and the at least one intake port prevents the air flowing out from the at least one exhaust port from flowing into the space on the intake port side. Therefore, air warmed by cooling the motor is prevented from flowing into the inner housing again through at least one intake port. Thereby, it is possible to suppress a decrease in cooling efficiency of the motor.

In one aspect of the present invention, the partition wall may be provided in the inner housing. According to this aspect, even if there are parts to be assembled inside the outer housing, the operator can easily assemble the inner housing and the outer housing. Furthermore, the partition wall may be integrally molded with the inner housing. In this case, assembly becomes easier.

In one aspect of the present invention, the partition wall may be an elastic body and may be configured to deform under pressure. According to this aspect, the partition wall is deformed by the pressure difference between the space on the intake port side and the space on the exhaust port side of the partition wall, so that the degree of adhesion to the inner housing and the outer housing can be increased. This makes it possible to more reliably prevent the air flowing out from at least one exhaust port from flowing into the space on the intake port side.

In one aspect of the present invention, the inner housing may be formed by connecting a plurality of members. The power tool may further include a closing member that closes at least a portion of the gap between the plurality of members. According to this aspect, it is possible to prevent the air warmed by cooling the motor and flowing out from at least one exhaust port from flowing into the inner housing again through the gaps between the plurality of members forming the inner housing. can. In this aspect, both the partition wall and the closing member may be integrally molded on either the inner housing or the outer housing. Preferably, both the partition wall and the closure member are integrally molded into the inner housing. In this case, assembly becomes easier.

In one aspect of the invention, the inner housing may include a first end and a cylindrical portion. The first end may house at least a spindle. The cylindrical part may extend in the longitudinal direction of the outer housing, and one end may be connected to the first end. At least one exhaust port may be provided at the first end. The at least one intake port may include at least one of an opening provided at the other end of the cylindrical portion and an opening provided in a peripheral wall defining the cylindrical portion. According to this aspect, an efficient flow path is defined that flows in the longitudinal direction toward the first end within the elongated cylindrical portion.

In one aspect of the invention, the motor may have an output shaft. The spindle and the motor may be arranged such that the drive shaft and the rotation axis of the output shaft extend parallel to each other. According to this aspect, the spindle and the motor can be arranged close to each other, and a compact working tool can be realized.

FIG. 3 is a perspective view of the vibrating tool with the lever disposed in the forward position. FIG. 3 is a cross-sectional view of the vibrating tool. FIG. 3 is a sectional view taken along line III-III in FIG. 2 (however, the tip tool is not shown). FIG. 3 is a perspective view from above of the inner housing. It is a perspective view from below of an inner housing. 3 is a partially enlarged view of FIG. 2. FIG. 7 is a partially enlarged view of FIG. 6. FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. FIG. 8 is a sectional view corresponding to FIG. 7 when the lever is placed in the upper position; FIG. FIG. 9 is a sectional view corresponding to FIG. 8 when the lever is placed in the upper position; FIG. 3 is a bottom view of the vibrating tool with the lower shell removed. 7 is a sectional view taken along line XII-XII in FIG. 6. FIG. FIG. 3 is a perspective view of the vibratory tool with the upper shell removed. FIG. 3 is a plan view of the vibrating tool with the upper shell removed.

Hereinafter, a vibrating tool 1 according to an embodiment will be described with reference to the drawings. Note that the vibrating tool 1 is an example of an electric power tool that performs machining work on a workpiece (not shown) by swinging the tip tool 91.

First, the schematic configuration of the vibrating tool 1 will be explained. As shown in FIGS. 1 and 2, the vibrating tool 1 includes an elongated housing (also referred to as a tool body) 10. An elongated spindle 5 and a motor 41 as a drive source are accommodated at one end of the housing 10 in the longitudinal direction. The spindle 5 is arranged so that its long axis intersects (in particular, is generally orthogonal to) the long axis of the housing 10. One end of the spindle 5 in the axial direction protrudes from the housing 10 and is exposed to the outside. This one end portion constitutes a tool mounting portion 51 to which a tip tool 91 can be attached and detached. Furthermore, a battery 93 for power supply to the motor 41 can be attached to and detached from the other end of the housing 10 in the longitudinal direction. The vibrating tool 1 is configured to swing the tip tool 91 on the swing plane P by reciprocating the spindle 5 around the drive shaft A1 within a predetermined angle range using the power of the motor 41. .

In addition, in the following description, for convenience, regarding the direction of the vibrating tool 1, the extending direction of the drive shaft A1 is defined as the vertical direction. In the vertical direction, the tool mounting portion 51 side of the spindle 5 is defined as the lower side, and the opposite side is defined as the upper side. Further, the direction perpendicular to the drive shaft A1 and corresponding to the longitudinal direction of the housing 10 is defined as the front-rear direction. In the front-rear direction, one end side of the housing 10 in which the spindle 5 is accommodated is defined as the front side, and the other end side where the battery 93 is attached is defined as the rear side. Further, a direction perpendicular to the up-down direction and the front-back direction is defined as the left-right direction.

The detailed configuration of the vibrating tool 1 will be described below.

First, the housing 10 will be explained. As shown in FIGS. 1 to 3, the housing 10 of this embodiment is configured as a so-called vibration-proof housing, and includes an elongated outer housing 2 that forms the outer shell of the vibrating tool 1, and a housing that is housed in the outer housing 2. and a long inner housing 3.

In this embodiment, the outer housing 2 is formed by connecting an upper shell 27, a lower shell 28, and a switch holder 20, which are formed separately from each other. The upper shell 27, the lower shell 28, and the switch holder 20 are each members integrally molded from synthetic resin. Although detailed illustrations are omitted, in the outer housing 2, an upper shell 27 and a lower shell 28 are stacked vertically with the switch holder 20 disposed therebetween, and these are connected with screws at multiple locations. It is formed by this.

In addition, in the front-rear direction, the outer housing 2 includes a front end 21 , a rear end 23 , and a center portion 22 connecting the front end 21 and the rear end 23 .

The front end portion 21 is formed into a generally rectangular box shape, and the front end portion 30 of the inner housing 3 is arranged inside. A lever 77 is rotatably supported at the upper front end portion of the front end portion 21 . The lever 77 is an operating member for fixing (locking) and releasing the tip tool 91 by a locking mechanism 7 (see FIG. 7), which will be described later. Further, an opening is provided in the upper wall portion of the front end portion 21, and a sliding operation portion 294 is exposed through this opening so that it can be operated externally. The operation unit 294 is an operation member for switching the switch 29 for starting the motor 41 between an on state and an off state.

The rear end portion 23 is formed into a cylindrical shape that widens toward the rear (the cross-sectional area increases). An elastic connecting portion 37 and a rear end portion 38 of the inner housing 3 are arranged inside the rear end portion 23 .

The central portion 22 is formed into a cylindrical shape and extends linearly in the front-rear direction. The central portion 22 constitutes a gripping portion that can be gripped by the user. For this reason, the center portion 22 is formed thinner than the front end portion 21 and the rear end portion 23 so that the user can easily hold it.

As shown in FIGS. 2 to 6, in this embodiment, the inner housing 3 is formed by connecting a metal housing 301 and a resin housing 302, which are formed separately from each other. Note that while the metal housing 301 is a single metal member, the resin housing 302 is formed by connecting a left shell 303 and a right shell 304 made of synthetic resin. The inner housing 3 is configured such that the rear end of the metal housing 301 (a connecting portion 321 to be described later) is sandwiched between the left shell 303 and the right shell 304 from the left and right sides, and these are connected by screws at multiple locations. It is formed.

In addition, in the front-rear direction, the inner housing 3 includes a front end portion 30, an extension portion 36, an elastic connecting portion 37, and a rear end portion 38.

The front end portion 30 is a portion that accommodates the spindle 5, the motor 41, and the transmission mechanism 45. The front end portion 30 includes a first accommodating portion 31 , a second accommodating portion 32 , a connecting portion 321 , a third accommodating portion 33 , and a cover portion 35 . Note that the metal housing 301 is configured by a portion of the front end portion 30 other than the cover portion 35 (that is, the first accommodating portion 31, the second accommodating portion 32, the connecting portion 321, and the third accommodating portion 33). Ru. The resin housing 302 includes a cover portion 35, an extension portion 36, an elastic connection portion 37, and a rear end portion 38, which will be described later.

The first accommodating portion 31 is a portion that accommodates the spindle 5, and is formed in a cylindrical shape extending in the vertical direction. The opening at the upper end of the first accommodating part 31 is covered by a cover 311 fixed to the first accommodating part 31 with a pin. The second accommodating portion 32 is a portion that accommodates the motor 41 and is formed in a cylindrical shape with a larger diameter than the first accommodating portion 31 . The second accommodating part 32 is arranged on the rear side of the first accommodating part 31. Further, the second accommodating part 32 is shorter in the vertical direction than the first accommodating part 31, and the lower end of the second accommodating part 32 is located above the lower end of the first accommodating part 31. The connecting portion 321 is a plate-shaped portion that connects to the rear end of the second accommodating portion 32 and projects rearward. The connecting portion 321 is a portion disposed between the left shell 303 and the right shell 304 and fixed with a screw. The third accommodating part 33 is a part that accommodates the transmission mechanism 45, and is arranged on the rear side of the first accommodating part 31 and below the second accommodating part 32. The third accommodating part 33 communicates with the first accommodating part 31 and the second accommodating part 32 . The cover portion 35 is a portion that covers the opening at the upper end of the second accommodating portion 32 .

The extension portion 36 is a cylindrical portion that is connected to the rear end portion (specifically, the second accommodating portion 32) of the front end portion 30 and extends rearward. The length of the extending portion 36 in the front-back direction is set to be approximately the same as the length of the central portion (grip portion) 22 in the front-back direction, and almost the entire length of the extending portion 36 is accommodated in the central portion 22. The rear end of the extension portion 36 is an open end. That is, the rear end of the extending portion 36 defines an opening.

The elastic connecting portion 37 is a portion that extends rearward from the rear end of the extending portion 36 and connects the extending portion 36 and the rear end portion 38 so as to be relatively movable. The elastic connecting portion 37 includes a plurality of elastic ribs 371 that connect the extending portion 36 and the rear end portion 38 in the front-rear direction. In this embodiment, four elastic ribs 371 are arranged at a distance from each other around the long axis of the inner housing 3 extending in the front-rear direction. The elastic ribs 371 are formed in a shape that is more easily deformed elastically than other parts of the inner housing 3, and are made of a material with a low elastic modulus. This suppresses vibrations generated at the front end portion 30 during processing operations from being transmitted to the rear end portion 38.

The rear end portion 38 is formed into a generally rectangular box shape. Note that, as described above, the rear end portion 38 is arranged inside the rear end portion 23 of the outer housing 2, but there is a gap between the rear end portion 23 and the outer peripheral surface of the rear end portion 38. It is formed.

The outer housing 2 and the inner housing 3 configured as described above are elastically connected to be movable relative to each other. The elastic connection structure between the outer housing 2 and the inner housing 3 will be described in detail later.

The internal structure of the inner housing 3 will be described below in the order of the front end 30, rear end 38, elastic connecting part 37, and extension part 36.

First, the internal structure of the front end portion 30 will be explained. As shown in FIG. 6, the front end portion 30 accommodates a spindle 5, a motor 41, a transmission mechanism 45, a clamp mechanism 60, and a push-down mechanism 67.

First, the spindle 5 will be explained. As shown in FIG. 7, the spindle 5 is a substantially cylindrical elongated member. In this embodiment, the spindle 5 is rotatably supported around the drive shaft A1 by two bearings 501 and 502 held at the lower part of the first housing part 31. As described above, the lower end of the spindle 5 is configured as the tool mounting portion 51 to which the tip tool 91 can be attached and detached.

In this embodiment, the tool mounting portion 51 is configured in the shape of a flange that protrudes radially outward with respect to the drive shaft A1, and has an inclined surface 513 that is inclined in a direction intersecting the drive shaft A1. More specifically, a recess 511 that is recessed upward is formed at the lower end of the tool mounting portion 51 . The inclined surface 513 is a part of the surface that defines the recess 511, and is configured as an inclined surface that is inclined in a direction (radially outward) away from the drive shaft A1 as it goes downward. On the other hand, all of the tip tools 91 (blade, scraper, grinding pad, polishing pad, etc.) that can be attached to the vibrating tool 1 of this embodiment have a convex portion 911 that can fit into the recess 511. A part of the upper surface defining the convex portion 911 is configured as an inclined surface 913 that matches the inclined surface 513. In this embodiment, the tip tool 91 is clamped by the tool mounting part 51 and the clamp head 615 of the clamp shaft 61, which will be described later, with the inclined surface 913 in contact with the inclined surface 513, and is fixed to the spindle 5. be done. Fixing of the tip tool 91 to the spindle 5 will be described in detail later. Note that a recess 515 having a circular cross section and recessed further upward from the recess 511 is provided at the center of the recess 511 .

The motor 41 will be explained. As shown in FIG. 6, the motor 41 is a brushless DC motor, and includes a stator, a rotor disposed within the stator, and an output shaft 415 that rotates integrally with the rotor. The motor 41 is housed in the second housing part 32 so that the rotation axis A2 of the output shaft 415 extends parallel to the drive shaft A1 (that is, in the vertical direction). Output shaft 415 projects downward from the rotor.

The transmission mechanism 45 will be explained. The transmission mechanism 45 is configured to transmit the rotational motion of the output shaft 415 to the spindle 5, and rotate the spindle 5 back and forth within a predetermined angular range around the drive shaft A1. As shown in FIG. 6, the transmission mechanism 45 includes an eccentric shaft 451 having an eccentric portion 454, a drive bearing 456, and a swing arm 458.

The eccentric shaft 451 is a shaft coaxially connected to the output shaft 415 of the motor 41. The eccentric shaft 451 is fixed to the outer periphery of the output shaft 415 and extends to the lower end of the third housing section 33. The eccentric shaft 451 is rotatably supported by two bearings 452 and 453 held at the lower end of the second housing part 32 and the lower end of the third housing part 33, respectively. The eccentric shaft 451 has an eccentric portion 454 that is eccentric with respect to the rotation axis A2. An inner ring of a drive bearing 456 is attached to the eccentric portion 454 . The swing arm 458 is a member that connects the drive bearing 456 and the spindle 5. The swing arm 458 extends across the first accommodating part 31 and the third accommodating part 33. Since this is a well-known configuration, detailed illustration is omitted, but one end of the swing arm 458 is formed in an annular shape and is fixed to the outer periphery of the spindle 5 between bearings 501 and 502. The other end of the swing arm 458 is formed into a bifurcated shape, and is arranged so as to come into contact with the outer peripheral surface of the outer ring of the drive bearing 456 from the left and right sides.

When the motor 41 is driven, the eccentric shaft 451 rotates integrally with the output shaft 415. As the eccentric shaft 451 rotates, the center of the eccentric portion 454 moves around the rotation axis A2, so the drive bearing 456 also moves around the rotation axis A2. As a result, the swing arm 458 swings within a predetermined angular range about the drive shaft A1 of the spindle 5. The spindle 5 reciprocates within a predetermined angular range around the drive shaft A1 as the swing arm 458 swings. As a result, the tip tool 91 fixed to the spindle 5 is oscillated around the drive axis A1 on the oscillating surface P, making it possible to perform machining work.

Furthermore, a fan 43 is fixed to the upper end of the eccentric shaft 451. The fan 43 of this embodiment is a centrifugal fan, and is configured to rotate around the rotation axis A2 as the motor 41 is driven, suck air from above in the direction of the rotation axis A2, and send it radially outward. ing. This creates an air flow within the housing 10 for cooling the motor 41. Note that the air flow path within the housing 10 will be described in detail later.

The clamp mechanism 60 will be explained below. The clamp mechanism 60 is a mechanism configured to fix the tip tool 91 to the tool mounting portion 51 so as to be rotatable integrally with the spindle 5. As shown in FIGS. 7 and 8, in this embodiment, the clamp mechanism 60 includes a clamp shaft 61, a clamp spring 65, and a lock mechanism 7.

The clamp shaft 61 is a substantially cylindrical elongated member, and is removably inserted into the spindle 5 coaxially with the spindle 5. The clamp shaft 61 includes a round bar-shaped shaft portion 611 extending along the drive shaft A1, and a flange-shaped clamp head 615 connected to the lower end of the shaft portion 611. Further, a groove portion 612 is provided at the upper end portion of the shaft portion 611. The groove portion 612 is a portion in which a plurality of grooves are formed vertically around the entire circumference of the clamp shaft 61.

The clamp spring 65 is a biasing member that biases the clamp shaft 61 upward with respect to the spindle 5 and applies a clamping force to the clamp shaft 61 for clamping the tip tool 91. In this embodiment, the clamp spring 65 is configured to bias the clamp shaft 61 upward via a lock mechanism 7 (specifically, a holder 73 and a clamp member 71), which will be described later. More specifically, the clamp spring 65 is a compression coil spring, and is arranged in a compressed state between a spring receiving member 57 arranged above the spindle 5 and a holder 73, which will be described later. Note that the spring receiving member 57 rotates integrally with the spindle 5.

The lock mechanism 7 is a mechanism configured to hold (lock) the clamp shaft 61 at a clamp position (position shown in FIGS. 7 and 8) where the tip tool 91 can be clamped. The locking mechanism 7 is arranged above the spindle 5 within the first housing portion 31 . In this embodiment, the lock mechanism 7 includes a pair of clamp members 71, a holder 73, an elastic ring 718, and a collar 75.

The pair of clamp members 71 are arranged to face each other with the drive shaft A1 in between. The radially inner surface of the clamp member 71 is formed as a curved surface corresponding to the outer peripheral surface of the shaft portion 611. Moreover, a protrusion 717 is provided on this curved surface. The protruding portion 717 is a portion in which a plurality of circumferentially extending protrusions are formed in the vertical direction. The protruding portion 717 is configured to be able to engage with the groove portion 612 of the clamp shaft 61. Further, the upper and lower end portions of the clamp member 71 protrude radially outward from the center portion. In other words, a groove extending in the circumferential direction is provided on the outer circumference of the central portion of the clamp member 71 in the vertical direction.

The holder 73 is configured to hold the pair of clamp members 71 movably in the radial direction with respect to the drive shaft A1. In this embodiment, the holder 73 is formed as a cylindrical member having a larger diameter than the shaft portion 611 of the clamp shaft 61 as a whole. The holder 73 has an insertion hole 731 and a pair of holding recesses 733.

The insertion hole 731 is a recess with a circular cross section that extends upward from the lower surface of the holder 73 along the drive shaft A1 and is closed at the upper end. The insertion hole 731 has a slightly larger diameter than the shaft portion 611 of the clamp shaft 61. The upper end of the shaft portion 611 can be inserted into the insertion hole 731 .

The pair of holding recesses 733 are provided at the center of the holder 73 in the vertical direction, and extend radially inward from the outer peripheral surface of the holder 73 (toward the drive shaft A1) symmetrically with respect to the drive shaft A1. . Each holding recess 733 communicates with the insertion hole 731 at its radially inner end. The holding recess 733 has a shape that matches the clamp member 71. The pair of clamp members 71 are disposed within the pair of holding recesses 733 so as to be movable in the radial direction.

More specifically, the pair of clamp members 71 have an engaged position closer to the drive shaft A1 (the position shown in FIG. 7) and a released position farther from the drive shaft A1 (located radially outward from the engaged position). position shown in FIG. 9). When placed in the engagement position, the protrusions 717 of the pair of clamp members 71 can engage with the grooves 612 of the clamp shaft 61. Further, when the clamp member 71 is disposed in the engagement position, the outer circumferential surface of the clamp member 71 is disposed at approximately the same position as the outer circumferential surface of the holder 73, and does not protrude radially outward from the holding recess 733. When placed in the release position, the protruding portion 717 and the groove portion 612 cannot engage with each other. Further, when the clamp member 71 is disposed in the release position, the outer circumferential surface of the clamp member 71 slightly protrudes radially outward from the holding recess 733.

Further, the lower end portion of the holder 73 has a flange-shaped spring receiving portion 735 that protrudes radially outward. The lower surface of the spring receiving portion 735 is in contact with the upper end portion of the clamp spring 65. Further, although the details will be described later, the lower surface of the center portion of the lower end of the holder 73 (the annular portion around the insertion hole 731) functions as a contact portion 737 that comes into contact with the push-down sleeve 671 when the clamp is released.

The elastic ring 718 is attached to a groove provided on the outer periphery of the pair of clamp members 71, and biases the pair of clamp members 71 toward the radially inner engagement position. Note that the elastic ring 718 of this embodiment is an annular member made of rubber.

The collar 75 is a cylindrical member, and holds the holder 73 and the clamp member 71 so as to be movable relative to the collar 75 along the drive shaft A1 (that is, in the vertical direction). The holder 73 is disposed inside the collar 75 and is slidable in the vertical direction along the inner peripheral surface of the collar 75. The collar 75 is supported so as to be immovable in the vertical direction with respect to the inner housing 3 and rotatable around the drive shaft A1. More specifically, the collar 75 is rotatably supported by a bearing 751 fixed within the upper end of the first housing portion 31 on the radially outer side of the collar 75. Note that by arranging the collar 75 in the first accommodating portion 31 above the spindle 5 instead of inside the spindle 5, the collar 75 can be easily assembled.

In this embodiment, the collar 75 is configured to prohibit or permit movement of the clamp member 71 from the engagement position to the release position, depending on the relative positional relationship with the clamp member 71 in the vertical direction. . In other words, the clamp member 71 has two positions: a position where it cannot be moved from the engaged position (hereinafter referred to as the locked position) and a position where it is movable in the radial direction from the engaged position to the released position (hereinafter referred to as the unlocked position). It is movable in the vertical direction with respect to the collar 75 in between.

More specifically, the collar 75 has an inner diameter that is approximately equal to the diameter of the holder 73, but an annular groove 753 that is recessed radially outward from the inner peripheral surface is provided in the center of the collar 75 in the vertical direction. . Therefore, as shown in FIG. 7, at a position where the outer circumferential surface of the clamp member 71 (specifically, the outer circumferential surfaces of the upper and lower ends) abuts the inner circumferential surface of the collar 75 (portions other than the groove 753), , the clamp member 71 cannot move radially outward from the engaged position. That is, at this time, the clamp member 71 is in the locked position. On the other hand, as shown in FIG. 9, at a position where the upper end faces the groove 753 and the lower end of the collar 75 faces the groove on the outer circumference of the clamp member 71, the clamp member 71 is moved radially outward from the engagement position. It becomes possible to move to. That is, at this time, the clamp member 71 is in the unlocked position. As described above, in this embodiment, the clamp member 71 is held by the holder 73, and therefore can stably move in the vertical direction and radial direction with respect to the collar 75.

Note that the relative positional relationship between the clamp member 71 and the collar 75 in the vertical direction changes depending on the operation of the lever 77, and this point will be described in detail later.

The push-down mechanism 67 will be explained below. The push-down mechanism 67 is configured to push the tip tool 91 downward with respect to the spindle 5 in conjunction with the operation of the clamp mechanism 60 (specifically, the downward movement of the holder 73). As shown in FIGS. 7 and 8, in this embodiment, the push-down mechanism 67 includes a push-down sleeve 671 that is arranged to be movable in the vertical direction with respect to the spindle 5, and a push-down sleeve 671 that is arranged to be movable in the vertical direction with respect to the spindle 5. and a biasing spring 675 that biases upward.

The push-down sleeve 671 is coaxially inserted through the spindle 5. Further, the push-down sleeve 671 is configured such that the clamp shaft 61 can be inserted therethrough. That is, the push-down sleeve 671 is arranged between the spindle 5 and the clamp shaft 61 in the radial direction.

More specifically, the push-down sleeve 671 is an elongated cylindrical member and has an outer diameter that is approximately equal to the inner diameter of the spindle 5 and an inner diameter that is approximately equal to the diameter of the shaft portion 611. The push-down sleeve 671 is longer than the spindle 5, and an upper portion of the push-down sleeve 671 projects upward from the spindle 5. Clamp shaft 61 is longer than push-down sleeve 671, and when inserted into push-down sleeve 671, clamp head 615 and groove 612 protrude from the lower and upper ends of push-down sleeve 671, respectively. The lower end of the push-down sleeve 671 is a large-diameter portion 673 having a larger diameter than other portions, and is configured to be able to fit into the recess 515 at the lower end of the spindle 5 . Note that the lower end surface 674 of the large diameter portion 673 is an annular plane.

A compression coil spring having a smaller diameter than the clamp spring 65 is used as the biasing spring 675. The biasing spring 675 is arranged inside the clamp spring 65, and the lower end of the biasing spring 675 is in contact with the spring receiving member 57. In other words, the spring receiving member 57 is used as a common spring receiving portion for the clamp spring 65 and the biasing spring 675. Thereby, a compact arrangement of the clamp spring 65 and the biasing spring 675 is realized while suppressing an increase in the number of parts.

Further, the upper end portion of the biasing spring 675 is in contact with a spring receiving member 676 disposed above the spring receiving member 57. The spring receiving member 676 is mounted on the push-down sleeve 671 so as to be movable in the vertical direction relative to the spring receiving member 57. The upper end of the spring receiving member 676 abuts a protrusion provided on the outer periphery of the push-down sleeve 671 from below. With this configuration, the biasing spring 675 biases the push-down sleeve 671 upward via the spring receiving member 676.

Due to the urging force of the urging spring 675, the push-down sleeve 671 is normally held at the uppermost position where the shoulder portion (step portion) of the large diameter portion 673 abuts the shoulder portion (step portion) of the recessed portion 515 of the spindle 5. has been done. Note that when the push-down sleeve 671 is disposed at the uppermost position, the lower end (lower end surface 674) of the push-down sleeve 671 is attached to the tip tool 91 (in detail, (upper surface of the convex portion 911). Further, the upper end of the push-down sleeve 671 is arranged below the lower surface (abutting portion 737) of the holder 73.

The clamp mechanism 60 and push-down mechanism 67 configured as described above are configured to operate in conjunction with the rotation operation of the lever 77 by the user. More specifically, the relative positional relationship in the vertical direction between the clamp member 71 and holder 73 and the collar 75 changes in conjunction with the rotational operation of the lever 77. Further, in conjunction with the movement of the holder 73, the push-down sleeve 671 also moves. The rotation operation of the lever 77 and the operations of the clamp mechanism 60 and the push-down mechanism 67 will be described below.

First, the lever 77 will be explained. As shown in FIGS. 1 and 8, the lever 77 has a substantially U-shape, and both ends of the lever 77 are rotatably supported by the upper part of the front end 21 of the outer housing 2. As shown in FIGS. The lever 77 has two positions, as shown in FIGS. 1 and 7, in which the center part of the lever 77 contacts the front surface of the front end part 21 (hereinafter referred to as the front position), and as shown in FIGS. 9 and 10, in the center part. is rotatable between a position (hereinafter referred to as an upper position) located above the front end portion 21. The lever 77 is connected to a rotation shaft 78 that is rotatable around a rotation axis A3 extending in the left-right direction. The rotation shaft 78 extends in the left-right direction above the lock mechanism 7 (holder 73), and is inserted into a through hole that passes through the cover 311 of the front end portion 30 of the inner housing 3 in the left-right direction. Both ends of the rotation shaft 78 are connected to both ends of the lever 77 and rotatably supported by the outer housing 2. The rotation shaft 78 rotates integrally with the lever 77 as the lever 77 is rotated. An eccentric portion (cam portion) 781 eccentric to the rotation axis A3 is provided at the center of the rotation shaft 78 (above the drive shaft A1).

When the lever 77 is placed in the forward position, as shown in FIGS. 7 and 8, a portion of the eccentric portion 781 having a smaller diameter (shorter diameter portion) is placed above and away from the holder 73. . Therefore, the rotating shaft 78 is not subjected to the biasing force of the clamp spring 65. The pair of clamp members 71 are arranged in a lock position with respect to the collar 75, and are urged upward together with the holder 73 by the clamp spring 65 while clamping the clamp shaft 61 in the engaged position, and move the clamp shaft 61 to the uppermost position. hold it. The clamp head 615 presses the tip tool 91 from below against the tool mounting portion 51 by the biasing force of the clamp spring 65 and fixes it to the spindle 5. That is, the clamp head 615 clamps the tip tool 91 together with the tool mounting portion 51. For this reason, the uppermost position of the clamp shaft 61 is also referred to as the clamp position.

On the other hand, when the lever 77 is rotated upward from the front position and placed in the upper position, in the process, as shown in FIG. 9 and FIG. comes into contact with the upper end of the holder 73 from above, and moves the holder 73 downward with respect to the spindle 5 and the collar 75 while further compressing the clamp spring 65. As a result, the clamping force (force pressing the tip tool 91 upward against the spindle 5) applied to the clamp head 615 by the clamp spring 65 is released. For this reason, the operation of rotating the lever 77 from the front position to the upper position is also referred to as a clamp release operation.

In conjunction with the clamp release operation, the clamp member 71 held by the holder 73 moves downward with respect to the collar 75 and is placed in the unlocked position. In other words, the clamp shaft 61 is unlocked by the lock mechanism 7. As mentioned above, the clamp member 71 is biased toward the engaged position by the elastic ring 718 mounted in the groove on the outer periphery. Therefore, unless an external force is applied to move the clamp member 71 radially outward from the engagement position against the biasing force of the elastic ring 718, the clamp shaft 61 will be temporarily held at that position by the clamp member 71. , it will not come off the spindle 5. When the user pulls the clamp shaft 61 downward, the clamp member 71 once moves to the release position, so the user can pull out the clamp shaft 61 from the spindle 5 and replace the tip tool 91.

Further, when the holder 73 moves downward relative to the spindle 5 in conjunction with the clamp release operation, in this process, the abutting portion 737 of the holder 73 touches the upper end of the push-down sleeve 671 located at the uppermost position. It abuts from above and pushes down the push-down sleeve 671 against the biasing force of the biasing spring 675. That is, the holder 73 has the function of holding the clamp member 71 and also the function of pressing down the push-down sleeve 671. When the tip tool 91 is oscillated in a state where the inclined surface 913 and the inclined surface 513 are in contact with each other and is pressed against the tool mounting portion 51 from below by the clamp head 615 (see FIG. 7), the tip tool 91 is attached to the tool mounting portion 51. It may become stuck. In such a case, the large diameter portion 673 of the push-down sleeve 671 comes into contact with the tip tool 91 from above during the lowering process and pushes the tip tool 91 downward, thereby eliminating the stuck state of the tip tool 91. I can do it. In this embodiment, the lower end surface 674 of the push-down sleeve 671 makes surface contact with the tip tool 91 around the shaft portion 611 and pushes down the tip tool 91 in a well-balanced manner, thereby more reliably eliminating the sticking of the tip tool 91. can do.

The operation when attaching the clamp shaft 61 to the spindle 5 and clamping the tip tool 91 is basically the reverse of the operation when removing it. With the lever 77 in the upper position and the clamp member 71 in the unlocked position with respect to the collar 75, the user moves the clamp shaft 61, which is inserted into the tip tool 91, onto the spindle 5 (push). It is inserted into the lowering sleeve 671) and moved upward until the upper end abuts the holder 73. During this process, the clamp member 71 once moves to the release position, and returns to the engagement position by the biasing force of the elastic ring 718. The protruding portion 717 engages with the groove portion 612, and the clamp shaft 61 is temporarily held by the clamp member 71.

When the user rotates the lever 77 from the upper position to the forward position, the biasing force of the clamp spring 65 that the rotation shaft 78 has received via the eccentric portion 781 is released. As a result, the holder 73 and the clamp member 71 are urged upward by the clamp spring 65 and moved upward relative to the collar 75. When the clamp member 71 moves to the lock position relative to the collar 75, the clamp shaft 61 also returns to the clamp position.

The internal structure of the rear end portion 38 will be described below. As shown in FIGS. 2 to 4, in this embodiment, the rear portion of the rear end portion 38 is configured as a battery mounting portion 381, and the front portion of the rear end portion 38 is configured as a controller housing portion 382. There is. The battery mounting portion 381 has an engagement structure that can slide the battery 93 into engagement, a terminal for electrically connecting the battery 93, and the like. Note that since the battery mounting portion 381 and its structure itself are well known, detailed explanation will be omitted. The controller accommodating portion 382 accommodates a controller 383 including a control circuit. The controller 383 is configured to drive the motor 41 when the switch 29 is turned on.

The internal structure of the elastic connecting portion 37 will be explained. As shown in FIGS. 2 to 4, the switch holder 20 is arranged in the internal space of the elastic connecting portion 37 (the space area circumferentially surrounded by the elastic ribs 371). The switch holder 20 is a member configured to hold the switch 29. Although the switch holder 20 is disposed within the internal space of the elastic connecting portion 37, it is fixed to the upper shell 27 and the lower shell 28 with screws, and is a part of the outer housing 2.

The internal structure of the extension portion 36 will be explained. As shown in FIGS. 2 to 4, in this embodiment, the spindle 5, motor 41, and transmission mechanism 45 are arranged at the front end 30, and the battery mounting section 381 is provided at the rear end 38, so that the extension The number of parts arranged in the existing portion 36 can be minimized. Therefore, electric wires and connection terminals for connecting the controller 383 and the board of the motor 41, etc. are arranged in the extension part 36 (not shown), but other parts are not particularly arranged. Therefore, the extending portion 36 is formed thinner than the front end portion 30, the elastic connecting portion 37, and the rear end portion 38 in order to make the central portion (grip portion) 25 of the outer housing 2 thin enough to be easily gripped. .

The elastic connection structure between the outer housing 2 and the inner housing 3 will be described below. In this embodiment, the outer housing 2 and the inner housing 3 are elastically connected at multiple locations. Specifically, between the front end 21 and the front end 30, between the rotating shaft 78 supported by the outer housing 2 and the front end 30, and between the switch holder 20 and the rear end 38, An elastic member is interposed in each case.

First, the elastic connection structure between the front end portion 21 and the front end portion 30 will be explained.

As shown in FIGS. 5, 6, 11, and 12, two recesses 335 each having a circular cross section are provided in the lower wall portion of the front end portion 30. As shown in FIGS. More specifically, the recess 335 is formed in the lower wall portion of the third accommodating portion 33 that accommodates the swing arm 458 of the transmission mechanism 45 as a recess that is recessed upward from the lower surface. The two recesses 335 are arranged side by side in the left-right direction. In addition, in the front-back direction, the two recesses 335 are arranged between the drive shaft A1 of the spindle 5 and the rotation axis A2 of the output shaft 415 of the motor 41 (more specifically, between the bearing 502 and the bearing 453). There is. On the other hand, as shown in FIG. 12, two cylindrical projections 215 are provided on the lower wall portion of the front end portion 21. As shown in FIG. The protrusions 215 each protrude upward from the lower wall of the front end 21 so as to face the center of the recess 335 of the inner housing 3 .

The elastic member 11 is fitted into each recess 335 . The elastic member 11 is formed into a cylindrical shape. The protrusion 215 is fitted into the inside of the elastic member 11 and is covered by the elastic member 11 over the entire circumference. The height of the elastic member 11 is set larger than the depth of the recess 335 and the height of the protrusion 215, and a gap is provided between the inner housing 3 and the outer housing 2 in the vertical direction. In this way, the cylindrical elastic member 11 is connected to the inner housing 3 and the outer housing 2 with its outer peripheral surface and upper end surface contacting the inner housing 3 and its inner peripheral surface and lower end surface contacting the outer housing 2. intervene between In this embodiment, the elastic member 11 is made of urethane resin having an ultrafine foam structure.

The elastic connection structure between the rotating shaft 78 and the front end portion 30 will be explained.

As shown in FIG. 8, the left end and right end of the rotation shaft 78 are rotatably supported by the upper left end and the upper right end of the front end 21, respectively. The rotation shaft 78 passes through the cover 311 of the front end portion 30 in the left-right direction within the upper end portion of the front end portion 21 . A recess 313 having a circular cross section and recessed inward (toward the center in the left-right direction) is provided on the left wall and right wall of the cover 311, respectively. On the other hand, two cylindrical elastic members 13 are fitted into the rotating shaft 78. The two elastic members 13 are arranged inside the left wall and the right wall of the front end 21 . The inner side of each elastic member 13 is fitted into a recess 313 of the cover 311, and is pressed against the outer housing 2 via a washer on the outside. In this way, the cylindrical elastic member 13 has its outer peripheral surface and inner end surface in contact with the inner housing 3, its inner peripheral surface in contact with the rotating shaft 78 connected to the outer housing 2, and It is interposed between the inner housing 3 and the outer housing 2 with the end surface contacting the outer housing 2 via the washer. Like the elastic member 11, the elastic member 13 is made of urethane resin having an ultrafine foam structure.

The elastic connection structure between the switch holder 20 and the rear end portion 38 will be explained.

As shown in FIG. 3, the switch holder 20 has a generally rectangular box shape. A recess 203 recessed toward the inside (center side in the left-right direction) is provided in the left wall portion and right wall portion of the switch holder 20, respectively. The elastic member 15 is fitted into the recess 203. Like the elastic member 11, the elastic member 15 is made of urethane resin having an ultrafine foam structure. The elastic member 15 has a through hole that penetrates the elastic member 15 in the left-right direction. On the other hand, a pair of arm portions 385 protrude forward from the left and right wall portions of the rear end portion 38 (controller accommodating portion 382) of the inner housing 3. A protrusion 386 that protrudes inward (toward the center in the left-right direction) is provided at the tip of each arm portion 385. The tip of the arm portion 385 contacts the outer surface of the elastic member 15, and the protrusion 386 is fitted into a through hole of the elastic member 15, and is covered with the elastic member 15 over the entire circumference. Note that the tip of the protrusion 386 is spaced apart from the bottom of the recess 203.

With the configuration described above, the inner housing 3 and the outer housing 2 are relatively movable in all directions including the up-down direction, the front-back direction, and the left-right direction via the elastic members 11, 13, and 15. In other words, the inner housing 3 and the outer housing 2 are elastically connected so as to be able to cope with vibrations in any direction.

Since the front end portion 30 accommodates the motor 41, the spindle 5, and the transmission mechanism 45, the largest vibration may occur in the front end portion 30 of the inner housing 3 when the tip tool 91 is driven to swing. More specifically, vibrations occur in the output shaft 415 and the spindle 5 as they are rotated. In contrast, in the present embodiment, the elastic member 11 interposed between the inner housing 3 and the outer housing 2 is arranged between the drive shaft A1 of the spindle 5 and the rotation axis A2 of the output shaft 415 in the front-rear direction. ing. With this arrangement, the elastic member 11 can cope with both vibrations caused by the spindle 5 and vibrations caused by the output shaft 415, and can effectively suppress transmission of vibrations to the outer housing 2. Further, the elastic member 11 is disposed below the third accommodating portion 33 that accommodates the swinging arm 458 of the transmission mechanism 45 in the vertical direction, and is located relatively close to the swinging surface P. Therefore, it is possible to suppress the inner housing 3 from wobbling within the outer housing 2 when the tip tool 91 is driven to swing.

Moreover, in this embodiment, two elastic members 11 are arranged side by side in the left-right direction, thereby realizing an elastic connection structure with higher durability than when one elastic member 11 is provided.

Furthermore, in the present embodiment, the front end portion 30 is elastically connected to the outer housing 2 through an elastic member 13 that is externally mounted on the rotation shaft 78 in addition to the elastic member 11 . In addition to the front end portion 30, the rear end portion 38 is also elastically connected to the switch holder 20 as a part of the outer housing 2 via the elastic member 15. Therefore, vibration transmission to the outer housing 2 is suppressed more effectively.

Further, by arranging the elastic member 13 as described above, the rotating shaft 78 can be stably held by the inner housing 3 (cover 311) via the elastic member 13 before the outer housing 2 is assembled. becomes. Thereafter, both ends of the rotating shaft 78 are sandwiched between the upper shell 27 and the lower shell 28 of the outer housing 2 from above and below, and the upper shell 27 and the lower shell 28 are connected with screws, so that the rotating shaft 78 is It is held by the outer housing 2. In this way, the elastic member 13 also contributes to ease of assembly. Moreover, since the two elastic members 13 are arranged at the left end and right end of the rotating shaft 78, the rotating shaft 78 can be held in a well-balanced manner. Furthermore, it is only necessary to fit the cylindrical elastic member 13 onto the rotating shaft 78, and the assembly is easy.

By the way, as described above, the switch 29 for starting the motor 41 is held at the rear end portion 23 of the outer housing 2 via the switch holder 20. Therefore, the outer housing 2 also holds a switching member 293 that is connected to the operating portion 291 of the switch 29 and switches the switch 29 between the on state and the off state. The switching member 293 and its holding structure will be described below.

As shown in FIGS. 2 and 4, the switching member 293 is a long member that extends linearly in the front-rear direction. An operating section 294 is integrally formed at the front end of the switching member 293. A rear end portion of the switching member 293 is connected to the operating portion 291 of the switch 29. The switching member 293 moves the actuating part 291 between the on position and the off position (that is, turning the switch 29 on and an off state). In this embodiment, the switching member 293 is held by the holding member 26 supported by the outer housing 2 so as to be movable in the front-rear direction with respect to the outer housing 2 .

As shown in FIGS. 2, 4, 13, and 14, the holding member 26 is supported by the lower shell 28 and the switch holder 20 of the outer housing 2, and allows the switching member 293 to be slid in the front-rear direction. is configured to hold. In this embodiment, the holding member 26 includes a slide guide portion 261 and support legs 263.

The slide guide portion 261 is formed in an elongated shape extending in the front-rear direction, and has a shape that generally corresponds to the switching member 293. A recess is formed in the upper surface of the slide guide portion 261. The switching member 293 is disposed within this recess so as to be slidable in the front-rear direction. A plurality of support legs 263 protrude from the left and right sides of the front end of the slide guide portion 261, respectively. As shown in FIG. 13, each support leg 263 extends downward in a curved manner. On the other hand, a plurality of protrusions 283 are provided on the left and right sides of the portion of the lower shell 28 that constitutes the front end 21, respectively. The protrusion 283 protrudes above the upper end of the lower shell 28. The protrusion 283 is provided at a position corresponding to the support leg 263 and receives the lower end of the support leg 263. Further, the rear end portion 262 of the holding member 26 is placed and locked on the switch holder 20 which is elastically connected to the rear end portion 38 of the inner housing 3.

As shown in FIG. 14, each support leg 263 is provided with a recess that is semicircular in plan view. Cylindrical portions 285 are provided inside the lower shell 28 at four locations facing the recessed portions of each support leg 263. Note that the upper end of the cylindrical portion 285 is located below the upper end of the lower shell 28. On the other hand, as shown in FIGS. 3 and 11, cylindrical portions 271 having internal threads formed on the inner periphery are provided at four corresponding locations on the upper shell 27. The cylindrical portion 271 protrudes below the lower end of the upper shell 27. In the assembly process of the vibrating tool 1, the inner housing 3 and the holding member 26 are housed in the lower shell 28, and then the upper shell 27 is connected to the lower shell 28. At this time, the cylindrical portion 271 of the upper shell 27 is fitted into the recess of the support leg 263, and further fitted into the cylindrical portion 285 of the lower shell 28, so that the holding member 26 is properly positioned relative to the outer housing 2. Positioned. Thereafter, a screw is inserted from below the cylindrical portion 285 and screwed into the cylindrical portion 271, thereby fixing the lower shell 28 and the upper shell 27.

Although detailed illustration is omitted, when the upper shell 27 is connected to the lower shell 28, each support leg 263 is spaced apart from the inner housing 3 inside the outer housing 2 along the inner surface of the upper shell 27. will be placed in Further, as shown in FIG. 12, the slide guide portion 261 is disposed within the outer housing 2 along the lower surface of the upper wall portion of the upper shell 27 and spaced apart from the inner housing 3.

Furthermore, as shown in FIGS. 13 and 14, in this embodiment, the holding member 26 holds a lighting device 260 for illuminating the work area of the tip tool 91 in addition to the switching member 293. For this reason, the holding member 26 has a lighting device holding part 265 that projects forward from the slide guide part 261. The lighting device holding section 265 includes an extension section 266 and a pair of arm sections 268. The extending portion 266 is a portion that extends linearly forward from the center in the left-right direction of the front end portion of the slide guide portion 261 to the front of the rotation shaft 78. The pair of arm portions 268 are portions that extend downward in a bifurcated manner from the front end of the extension portion 266 and hold the lighting device 260. Note that the holding member 26 is configured to guide an electric wire 269 for supplying power from the controller 383 to the lighting device 260. The electric wire 269 is held in a groove configured to extend from the rear end portion 262 to the lighting device holding portion 265 on the upper surface of the holding member 26 .

Further, as shown in FIG. 8, a groove 267 having a rectangular cross section and extending in the front-rear direction is formed on the lower surface of the extension portion 266. The groove 267 is configured to be able to fit into the long diameter portion of the eccentric portion 781 of the rotating shaft 78 . When the lever 77 is located at the forward position, the long diameter portion of the eccentric portion 781 of the rotating shaft 78 projects upward and fits into the groove 267. In this way, when the tip tool 91 is clamped, the lighting device holding part 265 is supported by the rotation shaft 78 and is arranged in the outer housing 2 while being spaced apart from the inner housing 3. In addition, in the assembly process of the vibrating tool 1, the operator attaches the rear end portion 38 and the lighting device holding portion 265 to the switch holder 20 and the rotation shaft 78, respectively, before housing the inner housing 3 in the outer housing 2. It can be placed and held stably. This facilitates the work of accommodating the inner housing 3 and the holding member 26 in the outer housing 2.

The air flow path within the housing 10 will be described below.

As described above, in this embodiment, the housing 10 has a two-layer structure including the inner housing 3 and the outer housing 2. Therefore, air for cooling the motor 41 flows into the outer housing 2 from the outside, further flows into the inner housing 3, cools the motor 41, flows out from the inner housing 3, and then flows from the outer housing 2 to the outside. leaks to.

In this embodiment, as shown in FIGS. 2 and 3, an annular opening is defined by the rear end (open end) of the rear end portion 23 of the outer housing 2 and the outer peripheral surface of the rear end portion 38 of the inner housing. (the gap) functions as an intake port 801 for allowing outside air to flow into the outer housing 2). On the other hand, as shown in FIGS. 2, 4, and 5, the inner housing 3 is provided with intake ports 803, 804, and 805 at a plurality of different positions. The intake port 803 is a plurality of through holes formed in the left wall and the right wall of the rear end portion 38 (specifically, the controller accommodating portion 382). The intake port 804 is an opening defined at the rear end of the cylindrical extension portion 36 . Further, the intake port 805 is a through hole formed in the upper wall portion and the lower wall portion of the extension portion 36, and extends linearly in the front-rear direction.

As shown in FIGS. 4 and 5, an exhaust port 807 for discharging air after cooling the motor 41 from the inner housing 3 is provided in the front end portion 30. More specifically, the exhaust port 807 is a plurality of through holes formed in the peripheral wall portion of the second accommodating portion 32, and is provided on the radially outer side of the fan 43. Further, as shown in FIG. 6, a plurality of exhaust ports 809 for discharging air from the outer housing 2 are formed in the lower wall portion of the front end portion 21 (more specifically, in the area below the motor 41). This is a through hole. Although detailed illustration is omitted, the exhaust ports 809 are arranged in parallel in the left-right direction. Further, an opening is provided in the lower wall portion of the front end portion 21 to expose the lower end portion of the spindle 5 to the outside, and a gap exists around the spindle 5. Therefore, the air discharged from the inner housing 3 can also flow out of the outer housing 2 through this gap.

Further, as shown in FIGS. 2, 3, and 5, in this embodiment, between the exhaust port 807 of the inner housing 3 and the intake ports 803, 804, and 805, the inner housing 3 and the outer housing 2 A partition wall 81 is provided to partition a space (gap) between the two. That is, the partition wall 81 divides the space between the inner housing 3 and the outer housing 2 into a space on the exhaust port 807 side and a space on the intake ports 803, 804, and 805 side. The partition wall 81 is formed into a tapered cylindrical shape, and an end portion with a smaller diameter is joined to the front end portion of the extension portion 36 so as to increase in diameter toward the front. The front edge of the partition wall 81 is in contact with the inner circumferential surface of the outer housing 2 and the slide guide portion 261 of the holding member 26 . In this embodiment, the partition wall 81 is made of an elastically deformable elastomer, and is integrally molded with the resin housing 302 (the left shell 303 and the right shell 304).

The flow path of the air generated by the rotation of the fan 43 and flowing inside the housing 10 is as follows. First, a portion of the air that has flowed into the outer housing 2 from the intake port 801 flows into the rear end portion 38 from the intake port 803 to cool the controller 383, and then flows forward through the gap in front of the rear end portion 38. Another part of the air flowing in from the intake port 801 flows forward through the gap between the rear end 23 and the rear end 38. Further, the air passes around the elastic ribs 371 and the switch holder 20, and part of the air flows into the cylindrical extension part 36 from the intake port 804, and another part flows between the central part 22 and the extension part. 36 and flows into the extension portion 36 from the intake port 805. In this embodiment, the air intake ports 804 and 805 are provided in the cylindrical extension part 36, so that the inflowing air efficiently flows inside the extension part 36 toward the front end part 30.

The air that has flowed into the front end portion 30 mainly flows into the motor 41 through a through hole in the center of a board disposed above the motor 41, and flows downward between the stator and rotor, causing the motor to Cool down 41. Thereafter, the air sent radially outward by the fan 43 flows out of the inner housing 3 from the exhaust port 807 of the second housing part 32, and further flows out of the housing 10 from the exhaust port 809 of the outer housing 2. do.

As described above, the partition wall 81 is arranged between the exhaust port 807 and the intake ports 803, 804, and 805. Therefore, air warmed by cooling of the motor 41 and discharged from the exhaust port 807 is prevented from passing through the outer housing 2 and flowing into the inner housing 3 from the intake ports 803, 804, and 805 again. Thereby, a decrease in cooling efficiency of the motor 41 can be suppressed.

Particularly, the partition wall 81 is made of elastomer and is formed into a tapered cylindrical shape. Therefore, the partition wall 81 is deformed due to the pressure difference generated between the space on the front side and the space on the rear side of the partition wall 81, and its peripheral edge is pressed against the inner peripheral surface of the outer housing 2 and the slide guide section 261, causing a tight contact. do. Thereby, it is possible to more reliably prevent the air discharged from the exhaust port 807 from flowing into the space on the side of the intake ports 803, 804, and 805. Moreover, since the partition wall 81 is elastically deformable, it is possible to reduce the possibility that a gap will occur when the inner housing 3 and the outer housing 2 move relative to each other.

Note that conventional power tools include a motor arranged so that the rotation axis of the output shaft (rotation axis of the fan) intersects with the drive axis of the spindle and extends parallel to the long axis of the inner housing. There are types to prepare for. In this type, air flows in from the intake port and flows in the longitudinal direction within the inner housing, passes through the fan as it is without changing its direction, and flows out from the exhaust port. In such a flow path, air flowing out from the exhaust port is difficult to flow toward the intake port.

On the other hand, in the vibrating tool 1 of the present embodiment, the motor 41 has the rotation axis A2 of the output shaft 415 (that is, the rotation axis A2 of the fan 43) parallel to the drive axis A1 of the spindle 5, and the length of the inner housing 3. It is arranged so as to intersect with the direction in which the shaft extends. With this arrangement, the spindle 5 and the motor 41 can be placed close to each other, and the vibrating tool 1 can be made more compact. On the other hand, the direction of air flow within the inner housing 3 changes near the motor 41. Specifically, the air flowing in from the intake ports 803, 804, and 805 flows forward along the long axis of the inner housing 3 within the extension portion 36, and flows toward the front end portion 30 (more specifically, the second housing portion 32). ) changes direction at the top of the motor 41 and flows downward through the exhaust port 807. In such a configuration, the air flowing out from the exhaust port 807 flows toward the intake ports 803, 804, and 805 more easily than in the above-mentioned type, so it can be said that the effect of providing the partition wall 81 is significant.

By the way, in this embodiment, the inner housing 3 is formed by connecting a metal housing 301 and a resin housing 302. Therefore, a gap may occur at the connecting portion (boundary) between the metal housing 301 and the resin housing 302. Therefore, the vibrating tool 1 is provided with a closing member 83 for closing the gap created between the metal housing 301 and the resin housing 302.

In this embodiment, although the front end of the extension part 36 is in contact with the second accommodating part 32, a slight gap is likely to occur between them. Therefore, the closing member 83 is configured to close the gap between the second accommodating portion 32 and the extension portion 36. On the other hand, the cover part 35 is fixed to the upper end part of the second accommodating part 32 by screws so as to be in close contact with the upper end part. Further, the left shell 303 and right shell 304 of the resin housing 302 are also fixed to each other by screws so as to be in close contact with each other. Therefore, in this embodiment, a closing member that closes these boundaries is not provided, but a closing member may be provided similarly.

In this embodiment, the closing member 83 is made of the same elastomer as the partition wall 81, and is integrally molded with the resin housing 302 (the left shell 303 and the right shell 304) along the front end of the extension portion 36. There is. Therefore, when the metal housing 301 and the resin housing 302 are connected, the closing member 83 comes into close contact with the outer peripheral surface of the second accommodating portion 32 and closes the gap. This prevents the air warmed by the cooling of the motor 41 and flowing out from the exhaust port 807 from flowing into the inner housing 3 again through the gap between the second housing part 32 and the extension part 36. can. Thereby, a decrease in cooling efficiency of the motor 41 can be suppressed. In particular, when air flows in from the gap between the second housing part 32 and the extension part 36, it is sucked into the motor 41 from above the motor 41 by the fan 43, so it is effective to close this gap. It is true.

Furthermore, as described above, in this embodiment, the partition wall 81 and the closing member 83 are integrally molded with the inner housing 3 (resin housing 302), so they are separate members from the inner housing 3 or the outer housing 2. Assembly is easier than in other cases. Further, since the switching member 293 of the switch 29 and the holding member 26 are held inside the outer housing 2, by providing the partition wall 81 on the inner housing 3, it is easy to assemble the inner housing 3 and the outer housing 2. becomes.

The correspondence between each component of the above embodiment and each component of the present invention is shown below. However, each component of the embodiment is merely an example, and does not limit each component of the present invention. The vibrating tool 1 is an example of a "work tool". The motor 41 is an example of a "motor". The spindle 5 is an example of a "spindle." The drive shaft A1 is an example of a "drive shaft." The inner housing 3 is an example of an "inner housing." Each of the intake ports 803, 804, and 805 is an example of an "intake port." The exhaust port 807 is an example of an "exhaust port." The outer housing 2 is an example of an "outer housing." The partition wall 81 is an example of a "partition wall." The metal housing 301 and the resin housing 302 are an example of "a plurality of members". The closing member 83 is an example of a "closing member." The front end 30 of the inner housing 3 is an example of a "first end". The extending portion 36 is an example of a “cylindrical portion”. Output shaft 415 is an example of an "output shaft." The rotation axis A2 is an example of a "rotation axis of an output shaft."

The above embodiment is merely an example, and the power tool according to the present invention is not limited to the configuration of the vibrating tool 1 illustrated. For example, changes exemplified below can be made. Note that any one or a plurality of these modifications may be employed in combination with the vibrating tool 1 shown in the embodiment or the invention described in each claim.

For example, the configuration (shape, constituent members, connection mode, etc.) of the housing 10 (inner housing 3 and outer housing 2) can be changed as appropriate. For example, the metal housing 301 and the resin housing 302 of the inner housing 3 may have different shapes. The resin housing 302 may be formed by connecting an upper shell and a lower shell, and the outer housing 2 may be formed by connecting a left shell and a right shell. The inner housing 3 may be formed only of a front end portion 30 (metal housing 301) that accommodates a spindle and the like. Further, the front end portion 30 and the rear end portion 38 may be connected only by the extension portion 36, or instead of the plurality of elastic ribs 371, a single elastic rib having a lower elastic modulus than the extension portion 36 may be used. May be connected by a body.

The air flow path within the housing 10 may be different from the example embodiments described above. Specifically, the shape, number, arrangement position, etc. of the intake ports 801, 803, 804, 805 and the exhaust ports 807, 809 may vary depending on changes to the housing 10 or the internal mechanism, or regardless of these changes. It may be changed as appropriate.

For example, the intake port 801 may be a through hole formed in the rear end portion 23. Inlet 803 may be omitted if controller 383 is located within extension 36 rather than rear end 38, for example. The intake port 805 may be formed only on one of the upper wall portion and the lower wall portion, or may be formed on the right wall portion and the left wall portion. Furthermore, the intake port 805 may be omitted. Since the fan 43 is a centrifugal fan, the exhaust port 807 is preferably arranged radially outward of the fan 43, but may be provided at another position. Further, when an axial fan is employed as the fan 43, an exhaust port 807 may be provided in the lower wall portion of the second accommodating portion 32, for example.

The material, shape, and position of the partition wall 81 may be changed as appropriate. For example, the partition wall 81 may be formed of an elastic body other than elastomer (for example, a synthetic resin foam). The partition wall 81 may have a simple annular shape instead of a tapered cylindrical shape. The partition wall 81 may be integrally molded with the outer housing 2 or may be formed as a separate member from the inner housing 3 and the outer housing 2. Further, the partition wall 81 may be placed at any position between the intake ports 803, 804, 805 of the inner housing 3 and the exhaust port 807, but is preferably placed as close to the exhaust port 807 as possible. . Further, the partition wall 81 does not need to completely partition the space on the side of the intake ports 803, 804, 805 and the space on the side of the exhaust port 807 (substantially prohibiting air circulation); It is preferable that the gap between the inner housing 3 and the outer housing 2 be as small as possible.

The material, shape, and position of the closing member 83 may be changed as appropriate. For example, the closing member 83 may be formed of an elastic body other than elastomer (for example, a synthetic resin foam). The closing member 83 may be formed as a separate member from the inner housing 3, and may be arranged to cover the gap, or may be embedded in the gap.

The configuration of the clamp mechanism 60 (for example, the shape, arrangement, and support structure of the clamp shaft 61 and the clamp spring 65, and the components, shape, arrangement, and support structure of the lock mechanism 7) may be changed as appropriate. For example, instead of the clamp member 71, a mechanism configured to use balls to hold the clamp shaft 61 at the clamp position may be employed. According to changes in the clamp mechanism 60, the configurations of the lever 77 and the rotation shaft 78 can also be changed. Alternatively, the clamp mechanism 60 may be omitted and the clamp shaft 61 may be fixed to the spindle 5 with a screw.

The configuration of the push-down mechanism 67 (for example, the shape, arrangement, support structure of the push-down sleeve 671, type of biasing spring 675, etc.) can be changed as appropriate. Further, the push-down mechanism 67 may be omitted.

The configurations (eg, shape, support structure, etc.) of the spindle 5, motor 41, and transmission mechanism 45 are not limited to the examples of the above embodiments, and may be modified as appropriate. For example, in the embodiment described above, the tool mounting portion 51 has the recess 351 corresponding to the tip tool 91 having the projection 911. Then, the tip tool 91 is fixed to the tool mounting section 51 with its inclined surface 913 in contact with the inclined surface 513 of the tool mounting section 51. However, the tool mounting portion 51 may have a planar lower surface and may be configured to be capable of fixing a tip tool having a planar upper surface. Furthermore, the motor 41 may be an AC motor. The motor 41 may be housed in the grip portion (center portion 22) of the housing 10 such that the rotation axis A2 of the output shaft 415 is orthogonal to the drive axis A1.

Furthermore, in view of the spirit of the present invention and the above-described embodiments and modifications thereof, the following aspects are constructed. The following aspects may be employed independently or in combination with the vibrating tool 1 shown in the embodiment, the above-described modification, or the invention described in each claim.
[Aspect 1]
The power tool further includes a fan configured to rotate integrally with the output shaft.
The fan 43 is an example of a "fan" in this embodiment.
[Aspect 2]
The partition wall is located closer to the at least one air inlet than the at least one air outlet.
[Aspect 3]
The outer housing has at least one intake port and at least one exhaust port,
The partition wall defines the space between the at least one intake port of the outer housing and the at least one exhaust port of the outer housing.
The intake port 801 and the exhaust port 809 are examples of the "intake port" and the "exhaust port" of this embodiment, respectively.
[Aspect 4]
The partition wall partitions the space between the inner housing and the outer housing into an intake side space on the side of the at least one intake port and an exhaust side space on the side of the at least one exhaust port, and The member is provided in a portion of the inner housing located in the exhaust side space.
[Aspect 5]
further comprising a fan configured to rotate integrally with the output shaft,
The inner housing includes a motor accommodating portion that accommodates the motor and the fan,
The closing member is configured to close a gap between the motor accommodating portion and a member connected to the motor accommodating portion.
The second housing section 32 is an example of the "motor housing section" of this aspect.
[Aspect 6]
The closing member is an elastic body.
[Aspect 7]
The inner housing is an elongated member having a long axis that intersects the drive shaft, and includes at least a first end that accommodates the spindle, and a first end that is different from the first end in the longitudinal direction of the inner housing. a second end on the opposite side, and a connecting portion connecting the first end and the second end and extending in the longitudinal direction,
The partition wall is provided at the connection part,
the at least one exhaust port is provided at the first end;
The at least one air intake port is provided at at least one of the second end portion and the connection portion.
The front end 30 and the rear end 38 are examples of the "first end" and "second end" of this embodiment, respectively.
[Aspect 8]
The first end houses the motor.
[Aspect 9]
The connecting portion includes a cylindrical portion having one end connected to the first end, extending toward the second end, and having an open other end, and connecting the other end of the extending portion to the second end. a plurality of connecting members elastically connecting the end portions;
The at least one intake port includes at least one of an opening formed in the second end, the opening in the cylindrical portion, and an opening formed in a peripheral wall defining the cylindrical portion.

1: Vibration tool, 10: Housing, 11: Elastic member, 13: Elastic member, 15: Elastic member, 2: Outer housing, 20: Switch holder, 203: Recess, 21: Front end, 215: Projection, 22: Center part, 23: rear end part, 26: holding member, 260: lighting device, 261: slide guide part, 262: rear end part, 263: support leg, 265: lighting device holding part, 266: extension part, 267: groove, 268: arm section, 269: electric wire, 27: upper shell, 271: cylindrical section, 28: lower shell, 283: protrusion, 285: cylindrical section, 29: switch, 291: operating section, 293: switching member, 294: Operation section, 3: Inner housing, 30: Front end, 301: Metal housing, 302: Resin housing, 303: Left shell, 304: Right shell, 31: First housing section, 311: Cover, 313: Recess, 32: Second accommodating part, 321: Connecting part, 33: Third accommodating part, 335: Recessed part, 35: Cover part, 351: Recessed part, 36: Extension part, 37: Elastic connecting part, 371: Elastic rib, 38 : Rear end part, 381: Battery mounting part, 382: Controller housing part, 383: Controller, 385: Arm part, 386: Projection, 41: Motor, 415: Output shaft, 43: Fan, 45: Transmission mechanism, 451: Eccentric shaft, 452: Bearing, 453: Bearing, 454: Eccentric part, 456: Drive bearing, 458: Swing arm, 5: Spindle, 501: Bearing, 502: Bearing, 51: Tool mounting part, 511: Recess, 513 : Inclined surface, 515: Recessed part, 57: Spring receiving member, 60: Clamp mechanism, 61: Clamp shaft, 611: Shaft part, 612: Groove part, 615: Clamp head, 65: Clamp spring, 67: Push-down mechanism, 671 : Press-down sleeve, 673: Large diameter portion, 674: Lower end surface, 675: Urging spring, 676: Spring receiving member, 7: Locking mechanism, 71: Clamp member, 717: Projection portion, 718: Elastic ring, 73 : Holder, 731: Insertion hole, 733: Holding recess, 735: Spring receiving part, 737: Contact part, 75: Collar, 751: Bearing, 753: Groove, 77: Lever, 78: Rotating shaft, 781: Eccentricity part, 801: intake port, 803, 804, 805: intake port, 807: exhaust port, 809: exhaust port, 81: partition wall, 83: closing member, 91: tip tool, 911: convex portion, 913: inclined surface, 93: Battery, A1: Drive shaft, A2: Rotation shaft, A3: Rotation shaft, P: Swing surface

Claims (10)

A work tool that performs machining work on a workpiece by swinging a tip tool,
motor and
a spindle rotatably supported around a drive shaft and configured to swing the removably attached tip tool by the power of the motor;
an inner housing that houses the motor and the spindle and has at least one intake port and at least one exhaust port;
an outer housing that accommodates the inner housing and is elastically connected to the inner housing so as to be movable relative to the inner housing;
Between the at least one exhaust port and the at least one intake port , a space between the inner housing and the outer housing is defined as a first space on the side of the at least one exhaust port, and a space between the at least one intake port and the at least one intake port. and a partition wall partitioning into a second space on the mouth side ,
The partition wall is a tapered cylindrical elastic body having only one end joined to the inner housing or the outer housing, and is configured to deform due to a pressure difference between the first space and the second space. A work tool characterized by : The working tool according to claim 1,
the outer housing has a long axis;
A direction perpendicular to the drive shaft and corresponding to the long axis of the outer housing defines a front-rear direction of the power tool,
the at least one exhaust port is located in front of the at least one intake port,
The power tool is characterized in that the partition wall has a rear end joined to the inner housing and is formed to expand in diameter toward the front. A work tool that performs machining work on a workpiece by swinging a tip tool,
motor and
a spindle rotatably supported around a drive shaft and configured to swing the removably attached tip tool by the power of the motor;
an inner housing that accommodates the motor and the spindle and has at least one intake port and at least one exhaust port, the inner housing being formed by connecting a plurality of members;
an outer housing that accommodates the inner housing and is elastically connected to the inner housing so as to be movable relative to the inner housing;
a partition wall defining a space between the inner housing and the outer housing between the at least one exhaust port and the at least one intake port;
and a closing member that closes at least a portion of the gap between the plurality of members. The working tool according to claim 3 ,
The power tool is characterized in that the partition wall is an elastic body and is configured to deform under pressure. The working tool according to claim 3 or 4 ,
A power tool characterized in that both the partition wall and the closing member are integrally molded on one of the inner housing and the outer housing. The working tool according to claim 5 ,
A power tool characterized in that both the partition wall and the closing member are integrally molded with the inner housing. The working tool according to any one of claims 1 to 5 ,
The power tool is characterized in that the partition wall is provided in the inner housing. The working tool according to claim 7 ,
A power tool characterized in that the partition wall is integrally molded with the inner housing. The working tool according to any one of claims 1 to 8 ,
The inner housing includes at least a first end portion that accommodates the spindle, and a cylindrical portion that extends in the longitudinal direction of the outer housing and has one end connected to the first end portion,
the at least one exhaust port is provided at the first end;
The at least one intake port includes at least one of an opening provided at the other end of the cylindrical portion and an opening provided in a peripheral wall defining the cylindrical portion. Work tools. The working tool according to any one of claims 1 to 9 ,
the motor has an output shaft;
The power tool is characterized in that the spindle and the motor are arranged so that the drive shaft and the rotation axis of the output shaft extend in parallel.

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