JP2017144540A - Working tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique contributing to further improvement of a transmission mechanism transmitting motive energy in a working tool for carrying out a processing operation to a workpiece by driving a tip tool.SOLUTION: A vibration tool 1 comprises a motor 20, a spindle 30 and a transmission mechanism 4. The spindle 30 is supported rotatably around a shaft line A1. The transmission mechanism 4 is configured to transmit a motive energy generated by driving of the motor 20 to the spindle 30 and to reciprocatingly turn the spindle 30 around the shaft line A1 within a prescribed angle range. The transmission mechanism 4 includes links 41 to 44 having link holes, and columnar pins 46 to 49. The cross section of the link hole orthogonal to the shaft line is circular, and the whole periphery of the link hole is surrounded by an inner wall face configured as a transmissible face in which transmission of the motive energy is possible between the link holes and the pins 46 to 49. The pins 46 to 49 inserted in the link holes are configured to transmit the motive energy in a direction orthogonal to the axis line of the link hole between the pins and the links 41 to 44.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a work tool that drives a tip tool to perform a machining operation on a workpiece.

  2. Description of the Related Art A work tool that performs a machining operation on a workpiece by swinging a tip tool attached to the lower end of a spindle is known. For example, Patent Document 1 discloses a work tool that includes a motor as a drive source and is configured to swing a tool attached to the lower end of a spindle.

German Patent Application Publication No. 102013132127

  The work tool includes a swing unit that converts the rotational motion of the drive shaft of the motor into the swing motion of the tool mounted on the spindle. The oscillating unit includes a first oscillating element that is fixed to the spindle and rotates together with the spindle, and a second oscillating element that is rotatably attached to an eccentric shaft that is coupled to the drive shaft of the motor. It consists of The first rocking element has a pair of arch-shaped levers that are divided into two and facing each other. The second rocking element is disposed between the pair of levers. When the drive shaft of the motor is rotated, the second oscillating element circulates around the rotation shaft of the drive shaft in a state where two curved surfaces provided on the outer peripheral surface are in contact with the inner surfaces of the pair of levers. This circular motion is converted into a reciprocating rotation around the axis of the spindle by the first oscillating element and transmitted to the spindle.

  At this time, in the first oscillating element, the lever is cantilevered and the motor torque is transmitted through the second oscillating element, so that a relatively large bending moment is applied to the lever. Easy to act. In particular, when the tip tool swings, one of the pair of levers receives the torque of the motor. Therefore, a design measure for securing the lever strength is required. In this regard, the work tool has room for further improvement.

  An object of the present invention is to provide a technique that contributes to further improvement of a transmission mechanism that transmits power in a work tool that drives a tip tool to perform a machining operation on a workpiece.

  According to one aspect of the present invention, there is provided a work tool that drives a tip tool to perform a machining operation on a workpiece. The work tool includes a motor, a spindle, and a transmission mechanism.

  The motor may be a direct current motor or an alternating current motor. The motor may be a motor having a brush or a so-called brushless motor not having a brush. From the viewpoint of output performance in terms of size ratio, a brushless motor is more preferable. The spindle includes a tool mounting portion that is rotatably supported around the first axis and is configured to be detachable from the tip tool.

  The transmission mechanism is configured to transmit power generated by driving the motor to the spindle, and to reciprocate the spindle within a predetermined angular range around the first axis. The transmission mechanism includes a first transmission element and a second transmission element. The first transmission element has an insertion hole. The insertion hole is a hole extending along the second axis and having a circular cross section perpendicular to the second axis. The second transmission element has a cylindrical shape and is inserted into the insertion hole. The inner wall surface of the first transmission element that surrounds the entire circumference of the insertion hole is configured as a transmittable surface that can transmit power to and from the second transmission element. Note that this definition means that the entire inner wall surface of the first transmission element can function as a transmission surface, and that the entire surface must always function as a transmission surface during actual power transmission. In addition, a mode in which only a part of the inner wall surface functions as a transmission surface during actual power transmission is not excluded. The second transmission element inserted in the insertion hole is configured to transmit power in a direction intersecting the second axis with the first transmission element.

  In the work tool configured as described above, the first transmission element is configured such that the inner wall surface surrounding the entire circumference of the insertion hole is a transmittable surface. That is, the first transmission element does not have a cut extending in the radial direction from the insertion hole and communicating with the outside. With this configuration, power is transmitted from the second transmission element inserted into the insertion hole to the first transmission element in a direction intersecting the axis (second axis) of the insertion hole (more specifically, motor torque). Even when the first transmission element is transmitted, the first transmission element is not easily deformed, so that the design measures required for the cantilever lever are not required. The transmission mechanism is composed of a simple combination of a first transmission element having a circular insertion hole and a cylindrical second transmission element, so that the dimensional accuracy of each element can be kept good. As a result, the angle range when the spindle is reciprocally rotated can be maintained with high accuracy.

  As one aspect of the work tool according to the present invention, the second transmission element is in a state where the second movement relative to the first transmission element is allowed to move in the circumferential direction of the second axis, and the second transmission element is It may be configured to transmit power in a direction intersecting the axis. In this way, by making the power transmission direction and the relative movement direction of the elements at the time of power transmission intersect, a smooth relative movement operation of the elements can be maintained even when strong power is transmitted.

  As one mode of the work tool according to the present invention, the motor may have an output shaft, and the output shaft may be arranged so as to extend in parallel with the first axis. The transmission mechanism is a link mechanism configured by combining a plurality of links, and each of the plurality of links has a link hole defining a joint portion and is connected to another link by a pin inserted into the link hole. May be. Each of the plurality of links may function as a first transmission element having a link hole as an insertion hole, and the pin may function as a second transmission element. In this case, in a work tool having a motor and spindle arrangement in which the output shaft and the first axis are parallel to each other, power can be efficiently transmitted by a transmission mechanism configured by a link mechanism.

  As one aspect of the work tool according to the present invention, the work tool may include an inner housing and an outer housing. The inner housing accommodates the motor, the spindle, and the transmission mechanism. The outer housing accommodates the inner housing and is connected to the inner housing via an elastic element. And the pin which functions as a fixing point in the link mechanism may be fixed to the inner housing. In this case, the outer housing in which vibration generated due to the drive of the motor, the spindle, and the transmission mechanism when the tip tool is operating on the workpiece is connected to the inner housing via an elastic element. Can be effectively suppressed.

  As one aspect of the work tool according to the present invention, the motor may have an output shaft, and may be arranged so that the output shaft extends in a direction intersecting the first axis. The second axis may be orthogonal to the first axis. The spindle also serves as the first transmission element, and may have an insertion hole extending along the second axis. The transmission mechanism may include an eccentric shaft and a connecting member. The eccentric shaft may be connected to the output shaft of the motor and rotatably supported together with the output shaft. The connecting member may be rotatably connected to the eccentric shaft, and may support the second transmission element so as to be rotatable in a direction intersecting the first axis. The second transmission element may be inserted into the insertion hole of the spindle. Thus, by providing the insertion hole in the spindle that also serves as the first transmission element, the transmission mechanism can be made simpler and more compact than when the first transmission element is provided as a separate member from the spindle. .

It is a longitudinal direction sectional view of the vibration tool according to the first embodiment. It is a perspective view which shows the internal structure of a vibration tool. It is sectional drawing in the III-III line of FIG. 1 which shows the internal structure of a vibration tool when a front-end tool exists in a right position. It is sectional drawing corresponding to FIG. 3 which shows the internal structure of a vibration tool when a front-end tool exists in a center position. It is sectional drawing corresponding to FIG. 3 which shows the internal structure of a vibration tool when a front-end tool exists in a left position. It is a front-back direction longitudinal cross-sectional view of the vibration tool which concerns on 2nd embodiment. It is a perspective view which shows the internal structure of a vibration tool. It is a transverse cross section in the axis of a motor showing the internal structure of a vibration tool when a tip tool exists in a right position. It is sectional drawing corresponding to FIG. 8 which shows the internal structure of a vibration tool when a front-end tool exists in a left position. It is a front-back direction longitudinal cross-sectional view of the vibration tool which concerns on 3rd embodiment. It is a perspective view which shows the internal structure of a vibration tool. It is a transverse cross section in the axis of a motor showing the internal structure of a vibration tool when a tip tool exists in a right position. It is sectional drawing corresponding to FIG. 12 which shows the internal structure of a vibration tool when a front-end tool exists in a left position.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, as an example of a work tool, an electric vibration tool (hereinafter simply referred to as a vibration tool) that swings and drives a tip tool to perform a machining operation on a workpiece will be described. . A plurality of types of tools such as blades and polishing pads are prepared as tip tools that can be attached to the vibration tool. The user can perform work by selecting one of these tip tools suitable for a desired work such as cutting or polishing and mounting the tool on the vibration tool. In the drawings referred to below, an example in which a blade is attached to a vibration tool is illustrated as an example of a tip tool.

[First embodiment]
With reference to FIGS. 1-5, the vibration tool 1 which concerns on 1st embodiment is demonstrated. First, the overall configuration of the vibration tool 1 will be described with reference to FIG. In the following description, for the sake of convenience, the direction of the vibration tool 1 is defined such that the extending direction of the axis A1 of the spindle 30 is the vertical direction, the direction orthogonal to the axis A1 and the extending direction of the inner housing 13 is the front-back direction. To do. This direction definition is also applied to other embodiments described later.

  As shown in FIG. 1, the vibration tool 1 includes an outer housing 12 that forms an outline of the vibration tool 1, and an inner housing 13 that is accommodated in the outer housing 12. Each of the outer housing 12 and the inner housing 13 may be formed of only one portion, or may be formed by combining a plurality of portions.

  The inner housing 13 is formed in a long shape extending in the front-rear direction. The inner housing 13 accommodates the spindle 30, the motor 20, and the transmission mechanism 4. Here, “accommodating” does not necessarily mean that the entire spindle 30, the motor 20, and the transmission mechanism 4 are completely covered by the inner housing 13. Including the case where it is exposed to the outside. Details of the configuration of the spindle 30, the motor 20, and the transmission mechanism 4 will be described later.

  In the present embodiment, the spindle 30, the motor 20, and the transmission mechanism 4 are disposed in the front region 131 including the front end portion of the inner housing 13. The central region 132 including the substantially central portion in the front-rear direction of the inner housing 13 is formed with a smaller height (length in the vertical direction) than the front region 131 because there is no element accommodated therein. The rear region 133 extending rearward of the central region 132 of the inner housing 13 is formed to have a height (length in the vertical direction) larger than that of the central region 132.

  As with the inner housing 13, the outer housing 12 is also formed in a long shape extending in the front-rear direction. In the outer housing 12, a region corresponding to the central region 132 of the inner housing 13 is configured as a gripping region 123 that functions as a portion that can be gripped by the user. In the present embodiment, the grip region 123 is formed to be slightly narrower than other portions of the outer housing 12 in order to have a shape and dimensions that are easy for the user to grip.

  The outer housing 12 is connected to the inner housing 13 via an elastic element. More specifically, the outer housing 12 of the present embodiment is elastically connected to the inner housing 13 at a plurality of locations so as to be relatively movable in all directions (front and rear, left and right, up and down directions). In the cross-sectional view shown in FIG. 1, a state in which the outer housing 12 is connected to the inner housing 13 through six elastic elements 91 to 96 arranged at six locations is shown. The elastic elements 91 and 92 are disposed at two locations between the front end portion of the inner housing 13 and the front end portion of the outer housing 12. The elastic elements 93, 94, and 95 are disposed at three positions between the lower end portion of the inner housing 13 and the lower end portion of the outer housing 12. The elastic element 96 is interposed between the rear upper end portion of the inner housing 13 and the rear upper end portion of the outer housing 12. In addition, although the anti-vibration rubber is mentioned as a typical example of the elastic elements 91-96, the elastic elements 91-96 may be formed with materials having elasticity other than the anti-vibration rubber.

  As described above, the outer housing 12 and the inner housing 13 are elastically coupled so as to be movable relative to each other, thereby causing the spindle 30, the motor 20, and the transmission mechanism 4 (particularly, the spindle 30) accommodated in the inner housing 13 to be driven. Thus, it is possible to suppress the vibration generated from being transmitted to the outer housing 12.

  In addition, a battery mounting portion 125 configured to be detachable from the battery 9 is provided at the rear end portion of the outer housing 12. The battery mounting part 125 has a terminal and the like for electrical connection with the battery 9. By providing the battery mounting portion 125 in the outer housing 12 that is vibrated by the above-described configuration, the durability of the battery mounting portion 125 can be enhanced. Further, since the mass of the outer housing 12 as a whole can be increased by the attached battery 9, it is possible to realize further lower vibration of the outer housing 12 compared to the case where the battery 9 is not attached.

  A controller 7 is disposed on the rear side of the inner housing 13 in the outer housing 12. Further, the outer housing 12 is provided with a slide switch (not shown) and a speed change dial (not shown). The motor 20, the battery mounting portion 125, and the slide switch are electrically connected to the controller 7, respectively. The controller 7 switches the motor 20 ON and OFF according to the slide position of the slide switch, and controls the rotation speed of the motor 20 during the ON operation according to the operation of the speed change dial.

  Next, with reference to FIGS. 1-3, the detail of a structure of the spindle 30, the motor 20, and the transmission mechanism 4 is demonstrated in order.

  As shown in FIGS. 1 and 2, the spindle 30 is a substantially columnar long member. The spindle 30 is disposed in the front region 131 of the inner housing 13 so that the axis A1 extends in the vertical direction of the vibration tool 1. In this embodiment, the spindle 30 is supported by the bearings 31 and 32 so as to be rotatable around the axis A1 at two locations in the vertical direction. The bearings 31 and 32 are held by the inner housing 13. The tip (lower end) of the spindle 30 protrudes below the inner housing 13 and is exposed to the outside. The spindle 30 has a flange-shaped tool mounting portion 35 at the lower end. The tool mounting portion 35 is a part configured to be detachable from the tip tool 8.

  In the present embodiment, a screw hole 351 is formed in the tool mounting portion 35 from the lower end of the spindle 30 along the axis A1. A fixing screw 37 having a flange-like fixing portion 371 can be fastened to the screw hole 351. The user can attach the tip tool 8 to the spindle 30 by fastening the fixing screw 37 in the screw hole 351 in a state where the tip tool 8 is sandwiched between the tool mounting portion 35 and the fixing portion 371. . Note that the method of attaching the tip tool 8 to the spindle 30 is not limited to this, and other methods such as a clamp shaft including a clamp shaft that penetrates the spindle 30 and a clamp member that clamps the clamp shaft above the spindle 30 are available. It may be adopted.

  As shown in FIG. 1, the motor 20 is disposed inside the inner housing 13 such that its axis A <b> 2 extends in parallel with the axis A <b> 1 of the spindle 30. Here, the term “parallel” means that the axis A1 and the axis A2 are substantially parallel, and does not indicate only the case where they are strictly parallel. In the present embodiment, the motor 20 is disposed on the rear side of the spindle 30 such that the axis A2 extends in the vertical direction and the output shaft 21 protrudes downward. Further, since the motor 20 is small and has high output, a brushless DC motor is adopted. An eccentric shaft 401 is connected to the output shaft 21 of the motor 20 coaxially with the output shaft 21. The eccentric shaft 401 is rotatably supported together with the output shaft 21 by bearings 402 and 403 arranged at two locations on the upper and lower sides. The eccentric shaft 401 has an eccentric portion 405 that is eccentric with respect to the axis A2 between the bearings 402 and 403 in the vertical direction.

  The transmission mechanism 4 is configured to transmit the rotational motion of the motor 20 to the spindle 30 and to reciprocate the spindle 30 within a predetermined angular range around the axis A1. That is, the transmission mechanism 4 is configured to drive the tip tool 8 to swing around the spindle 30. As shown in FIGS. 2 and 3, the transmission mechanism 4 of the present embodiment is configured as a link mechanism composed of a combination of a plurality of links. More specifically, the transmission mechanism 4 includes four links of a first link 41, a second link 42, a third link 43, and a fourth link 44, which are a first pin 46, a second pin 47, and a third link. The pin 48 and the fourth pin 49 are used for connection.

  In this embodiment, each of the 1st link 41, the 2nd link 42, the 3rd link 43, and the 4th link 44 has the link hole which defines a joint part in the both ends. The first link 41 is provided with link holes 411 and 412. The second link 42 is provided with link holes 421 and 422. The third link 43 is provided with link holes 431 and 432. The fourth link 44 is provided with link holes 441 and 442. In the following, for convenience of explanation, when the first link 41, the second link 42, the third link 43, and the fourth link 44 are collectively referred to, or when any of these is indicated without distinction, the link 40 is simply used. That's it. In addition, when the link holes 411, 412, 421, 422, 431, 432, 441, and 442 are collectively referred to, or when any of them is referred to without being distinguished, the link holes 400 are simply referred to.

  Each of the link holes 400 extends along an axis parallel to the axis A1 and the axis A2 (that is, in the vertical direction), and has a circular cross section in a direction orthogonal to the axis A1 and the axis A2 (that is, the horizontal direction). The link hole 400 is a through hole formed in the link 40, and the entire circumference is surrounded by the inner wall surface of the link 40. It can be said that the link hole 400 is not a bay shape but a through-hole surrounded by a peripheral portion. That is, the link 40 does not have a cut extending from the link hole 400 in the radial direction and communicating with the outside.

  As shown in FIG. 1, the first pin 46 is disposed so as to extend in the vertical direction, and an upper end portion thereof is fixed to the inner housing 13. As shown in FIGS. 2 and 3, the lower end portion of the first pin 46 is inserted into one link hole 411 of the first link 41. The 1st pin 46 is supporting the 1st link 41 so that rotation is possible. A second pin 47 is inserted into the other link hole 412 of the first link 41. The second pin 47 is also inserted into one link hole 421 of the second link 42, and connects the first link 41 and the second link 42 so as to be relatively rotatable. A third pin 48 is inserted into the other link hole 422 of the second link 42. The third pin 48 is also inserted into one link hole 431 of the third link 43, and connects the second link 42 and the third link 43 so as to be relatively rotatable. A fourth pin 49 is inserted into the other link hole 432 of the third link 43. The fourth pin 49 is also inserted into one link hole 441 of the fourth link 44, and connects the third link 43 and the fourth link 44 so as to be relatively rotatable. The spindle 30 is inserted and fixed in the other link hole 442 of the fourth link 44. As described above, the transmission mechanism 4 of the present embodiment is configured as a link mechanism having the first pin 46 as a fixed point. In the following, for convenience of explanation, when the first pin 46, the second pin 47, the third pin 48, and the fourth pin 49 are generically referred to, or when any of these is indicated without distinction, the pin 45 is simply referred to. That's it.

  Further, the second link 42 is attached to the outer peripheral portion of the eccentric shaft 401 so as to be relatively rotatable. More specifically, a through hole 424 extending in the vertical direction is provided at the center of the second link 42, similarly to the link holes 421 and 422. The outer ring of the drive bearing 425 is fixed inside the through hole 424, and the eccentric portion 405 of the eccentric shaft 401 is inserted into the inner ring of the drive bearing 425 so as to be rotatable relative to the second link 42.

  In the transmission mechanism 4 configured as described above, the inner wall surface of the link 40 surrounding the entire circumference of the link hole 400 is configured as a transmittable surface capable of transmitting power to and from the pin 45 inserted into the link hole 400. Has been. Further, the pin 45 is configured to transmit power in a direction intersecting the axis of the link hole 400 in a state in which relative movement of the axis of the link hole 400 in the circumferential direction is allowed with respect to the link 40. . The above-mentioned “the inner wall surface of the link 40 surrounding the entire circumference of the link hole 400 is configured as a transmittable surface” means that the entire inner wall surface can function as a transmitting surface. Thus, it is not always necessary that the entire inner wall surface functions as a transmission surface during actual power transmission, and it is not excluded that only a part of the inner wall surface functions as a transmission surface during actual power transmission.

  Hereinafter, with reference to FIGS. 3 to 5, power transmission in the transmission mechanism 4 configured as described above will be described. When the motor 20 is driven, the eccentric shaft 401 rotates with the output shaft 21. As the eccentric shaft 401 rotates, the center C of the eccentric portion 405 moves (circulates) around the axis A2. Along with this, the second link 42 mounted so as to be relatively rotatable with respect to the eccentric portion 405 via the drive bearing 425 also moves around the axis A2. The second pin 47 inserted into the link hole 421 of the second link 42 and the link hole 412 of the first link 41 relatively moves in the circumferential direction of the axis of the link hole 412, and in the direction crossing the axis, the link hole 412. By pressing the inner wall surface, the first link 41 is rotated around the first pin 46 fixed to the inner housing 13.

  Further, the third pin 48 inserted into the link hole 422 of the second link 42 and the link hole 431 of the third link 43 is linked in the direction intersecting the axis while relatively moving in the circumferential direction of the axis of the link hole 431. The third link 43 is rotated with respect to the second link 42 by pressing the inner wall surface of the hole 431. The fourth pin 49 inserted into the link hole 432 of the third link 43 and the link hole 441 of the fourth link 44 is relatively moved in the circumferential direction of the axis of the link hole 441 and is linked to the link hole 441 in the direction intersecting the axis. The fourth link 44 is rotated with respect to the third link 43 by pressing the inner wall surface. Accordingly, the spindle 30 inserted and fixed in the link hole 442 of the fourth link 44 is rotated around the axis A1.

  In the present embodiment, the shape of the first link 41, the second link 42, the third link 43, and the fourth link 44 constituting the link mechanism and the fixing position of the first pin 46 are rotated by the fourth link 44. The spindle 30 is set so as to reciprocate within a predetermined angle range. Therefore, the tip tool 8 clamped by the tool mounting portion 35 and the fixing screw 37 swings between the right position shown in FIG. 3 and the left position shown in FIG. FIG. 4 shows the center position that passes through in the swinging process. The center position is the position of the tip tool 8 when the center line L1 in the left-right direction of the tip tool 8 coincides with a straight line L2 (the center line in the left-right direction of the vibration tool 1) extending in the front-rear direction through the axis A1 of the spindle 30. It is. The right position is the position of the tip tool 8 when the center line L1 is inclined rightmost with respect to the straight line L2. The left position is the position of the tip tool 8 when the center line L1 is inclined leftmost with respect to the straight line L2.

  For example, when the output shaft 21 of the motor 20 is rotated 90 degrees in the direction of the arrow D1 (clockwise) from the state where the tip tool 8 is in the right position (see FIG. 3), the center C of the eccentric portion 405 is also about the axis A2. Rotate 90 degrees in the direction of arrow D1. During this time, the eccentric portion 405 drives the transmission mechanism 4 via the second link 42, and the fourth link 44 rotates the spindle 30 in the direction of arrow D2 (counterclockwise). The tip tool 8 swings in the left direction (counterclockwise) and reaches the center position (see FIG. 4). When the output shaft 21 further rotates 90 degrees in the direction of the arrow D1, the spindle 30 further rotates in the direction of the arrow D2, and the tip tool 8 further swings leftward to reach the left position (see FIG. 5).

  When the output shaft 21 further rotates 90 degrees in the direction of the arrow D1 from here, the center C of the eccentric portion 405 also rotates about the axis A2 in the direction of the arrow D1 by 90 degrees. On the other hand, the fourth link 44 rotates the spindle 30 in the arrow D3 direction (clockwise). The tip tool 8 swings in the right direction (clockwise) and reaches the center position (however, the position of the transmission mechanism 4 at this time is different from the state shown in FIG. 4). When the output shaft 21 further rotates 90 degrees in the direction of the arrow D1, the spindle 30 further rotates in the direction of the arrow D3, and the tip tool 8 further swings in the right direction to reach the right position (see FIG. 3). Thus, when the output shaft 21 rotates 360 degrees in the direction of the arrow D1 (that is, when it rotates once), the tip tool 8 reciprocates once between the right position and the left position. By repeating this operation, the tip tool 8 performs a predetermined processing operation (for example, cutting, grinding, polishing, etc.).

  As described above, in the vibration tool 1 of the present embodiment, the power generated by driving the motor 20 is transmitted to the spindle 30 so that the spindle 30 is reciprocated within a predetermined angular range around the axis A1. A link mechanism is employed as the configured transmission mechanism 4. In the transmission mechanism 4, power is transmitted by the link 40 having the link hole 400 having a circular cross section and the pin 45 inserted into the link hole 400. The entire periphery of the link hole 400 is surrounded by the inner wall surface (transmittable surface) of the link 40. That is, the link 40 does not have a cut extending in the radial direction of the link hole 400 and communicating with the outside. Therefore, even when power (more specifically, the torque of the motor 20) is transmitted from the pin 45 inserted into the link hole 400 to the link 40 in a direction intersecting the axis of the link hole 400, the link 40 is Difficult to deform. This eliminates the need for design measures required for cantilever levers used in conventional transmission mechanisms. Moreover, since the transmission mechanism 4 is configured by a simple combination of the link 40 having the circular cross-sectional link hole 400 and the cylindrical pin 45, the dimensional accuracy of each element can be kept good, and thus The angle range when the spindle 30 is reciprocally rotated can be maintained with high accuracy.

  Further, the pin 45 transmits power in a direction intersecting the axis of the link hole 400 to the link 40 in a state where relative movement of the axis of the link hole 400 with respect to the link 40 is allowed in the circumferential direction. It is configured. Thus, by making the power transmission direction and the relative movement direction between the pin 45 and the link 40 during power transmission intersect, a smooth relative movement operation can be maintained even when strong power is transmitted. .

  In the present embodiment, the spindle 30 and the motor 20 are arranged such that the axis A1 and the axis A2 extend in parallel. The transmission mechanism 4 configured by a link mechanism can efficiently transmit power between the spindle 30 and the motor 20 having such an arrangement relationship.

  In the present embodiment, the vibration tool 1 includes a two-layer housing of an outer housing 12 and an inner housing 13 that are elastically coupled so as to be relatively movable. The motor 20, the spindle 30, and the transmission mechanism 4 are accommodated in the inner housing 13, and the first pin 46 that functions as a fixing point of the link mechanism is fixed not to the outer housing 12 but to the inner housing 13. Therefore, the vibration generated due to the drive of the spindle 30, the motor 20, and the transmission mechanism 4 (particularly the spindle 30) is more reliably suppressed from being transmitted to the outer housing 12 that is elastically connected to the inner housing 13. be able to.

In the present embodiment, the motor 20, the spindle 30, and the transmission mechanism 4 are configuration examples corresponding to the “motor”, “spindle”, and “transmission mechanism” of the present invention, respectively. The link 40 and the pin 45 are configuration examples corresponding to the “first transmission element” and the “second transmission element” of the present invention, respectively.
The link hole 400 is a configuration example corresponding to the “insertion hole” of the present invention. The inner housing 13 and the outer housing 12 are configuration examples corresponding to the “inner housing” and the “outer housing” of the present invention, respectively.

[Second Embodiment]
Hereinafter, the vibration tool 2 according to the second embodiment will be described with reference to FIGS. A part of the configuration of the vibration tool 2 of the present embodiment is the same as that of the first embodiment. Therefore, in the following, the same components are denoted by the same reference numerals, description thereof is omitted or simplified, and differences from the first embodiment are mainly described. The main differences from the first embodiment are the arrangement of the motor 25 and the configuration of the transmission mechanism 5.

  First, the overall configuration of the vibration tool 2 will be described with reference to FIG. The vibration tool 2 includes an outer housing 120 that forms an outline of the vibration tool 2, and an inner housing 130 that is accommodated in the outer housing 120. The inner housing 130 accommodates the spindle 301, the motor 25, and the transmission mechanism 5. The inner housing 130 is a long housing extending in the front-rear direction, like the inner housing 13 of the first embodiment. As in the first embodiment, the spindle 301 is disposed in the front region 131 of the inner housing 130 such that the axis A1 extends in the vertical direction. On the other hand, in the present embodiment, a DC motor having a brush is employed as the motor 25. The motor 25 is disposed in the rear region 133 such that the output shaft 26 projects forward and the axis A3 of the output shaft 26 extends in the front-rear direction. That is, the spindle 301 and the motor 25 are arranged such that the axis A1 and the axis A3 intersect (more specifically, orthogonal). The transmission mechanism 5 that transmits the power of the motor 25 to the spindle 301 is disposed in the central region 132.

  Also in this embodiment, the outer housing 120 is elastically connected to the inner housing 130 at a plurality of locations so as to be relatively movable in all directions (front and rear, left and right, and up and down directions). 6 shows a state in which the outer housing 120 is connected to the inner housing 130 via four elastic elements 91, 92, 95, and 96 arranged at four locations. Further, unlike the first embodiment, since the inner housing 130 is formed at substantially the same height over the entire length, the height of the outer housing 120 is also substantially constant in the front-rear direction. On the other hand, the point that the central portion functions as the grip region 123 is the same as in the first embodiment.

  Next, with reference to FIGS. 6-8, the detail of a structure of the transmission mechanism 5 of this embodiment is demonstrated. Also in this embodiment, the transmission mechanism 5 is configured to transmit the rotational motion of the motor 25 to the spindle 301 and to reciprocately rotate the spindle 301 within a predetermined angular range around the axis A1. As shown in FIGS. 6 to 8, the transmission mechanism 5 of this embodiment includes an eccentric shaft 51, a connecting member 57, a swing pin 58, and a spindle 301.

  As described above, in the present embodiment, the motor 25 is disposed such that the axis A3 extends in the front-rear direction and the output shaft 26 projects forward. An eccentric shaft 51 is connected to the output shaft 26. The eccentric shaft 51 is rotatably supported by a bearing 52 held by the inner housing 130 and rotates together with the output shaft 26. The eccentric shaft 51 has an eccentric portion 55 that is eccentric with respect to the axis A3 at the front end.

  The connecting member 57 includes a cylindrical portion 571, a drive bearing 572, and a support pin 574. The cylindrical part 571 is a cylindrical member. An outer ring of the drive bearing 572 is fixed to the inner peripheral surface of one end portion of the cylindrical portion 571. A pair of support holes 573 are provided at the other end of the cylindrical portion 571 so as to face the radial direction of the cylindrical portion 571. The support pin 574 is non-rotatably supported by a pair of support holes 573 inside the cylindrical portion 571.

  A swing pin 58 is connected to the support pin 574. The swing pin 58 includes a connection portion 581 formed in a cylindrical shape and a drive portion 582 formed in a columnar shape. A support pin 574 is inserted through the connection portion 581. The support pin 574 supports the connection portion 581 in a rotatable manner. Further, the connecting portion 581 is configured to be slidable along the axis of the support pin 574. The drive unit 582 is formed integrally with the connection unit 581, and the axis of the drive unit 582 extends in a direction orthogonal to the axis of the connection unit 581 (the axis of the support pin 572). The swing pin 58 is supported by the support pin 574 so that the drive unit 582 protrudes from the end opposite to the side where the drive bearing 572 is disposed.

  The spindle 301 of the present embodiment has an insertion hole 36 in a portion between the bearings 31 and 32 in the vertical direction. The insertion hole 36 is formed as a through hole extending in a direction (horizontal direction) orthogonal to the axis A1. The cross-sectional shape in the direction orthogonal to the axis of the insertion hole 36 is circular. The insertion hole 36 may be formed as a bottomed hole instead of a through hole.

  The connecting member 57 configured as described above is arranged so that the axis of the cylindrical portion 571 extends in the front-rear direction and the drive bearing 572 is on the rear side, and the eccentric portion 55 of the eccentric shaft 51 is driven. The bearing 572 is inserted into the inner ring from behind. That is, the cylindrical part 571 is mounted so as to be rotatable relative to the eccentric part 55. The connecting member 57 is arranged such that the support pin 574 extends in the same vertical direction as the axis A <b> 1 of the spindle 301 in a state where the drive portion 582 of the swing pin 58 is inserted into the insertion hole 36 of the spindle 301. ing.

  In the present embodiment, the inner wall surface of the spindle 301 that surrounds the entire circumference of the insertion hole 36 is configured as a transmittable surface capable of transmitting power to and from the drive unit 582 inserted into the insertion hole 36. The drive unit 582 is configured to transmit power to the spindle 301 in a direction intersecting the axis of the insertion hole 36.

  Hereinafter, with reference to FIG. 8 and FIG. 9, power transmission in the transmission mechanism 5 configured as described above will be described. When the motor 25 is driven, the eccentric shaft 51 rotates together with the output shaft 26. As the eccentric shaft 51 rotates, the center of the eccentric portion 55 moves (circulates) around the axis A3. Accordingly, the cylindrical portion 571 mounted so as to be rotatable relative to the eccentric portion 55 via the drive bearing 572 also moves around the axis A3. On the other hand, since the drive portion 582 of the swing pin 58 supported by the support pin 574 is inserted into the insertion hole 36 of the spindle 301, the swing pin 58 is restricted from moving in the vertical direction. Therefore, the swing pin 58 moves up and down relatively with respect to the support pin 574 of the connecting member 57 that moves around the axis A3 together with the eccentric portion 55, and intersects the axis A1 of the spindle 301 with the support pin 574 as a fulcrum. Swing in the horizontal direction (perpendicular). Accordingly, the drive unit 582 slides in the axial direction of the insertion hole 36 in the insertion hole 36 of the spindle 301 and presses the inner wall surface in a direction intersecting the axis (more specifically, in the horizontal direction). The spindle 301 is reciprocated within a predetermined angle range. Also in this embodiment, when the output shaft 26 rotates 360 degrees (that is, once), the tip tool 8 reciprocates once between the right position shown in FIG. 8 and the left position shown in FIG.

  As described above, in the transmission mechanism 5 of the vibration tool 2 of the present embodiment, the spindle 301 having the insertion hole 36 having a circular cross section and the swing pin having the columnar drive portion 582 inserted into the insertion hole 36. 58, an eccentric shaft 51 connected to the output shaft 26 of the motor 25, and an eccentric shaft 51 rotatably connected to the eccentric shaft 51. The swing pin 58 is rotatably supported in a direction crossing the axis A1 of the spindle 301. The transmission of power is performed by the connecting member 57. The entire circumference of the insertion hole 36 is surrounded by the inner wall surface (transmittable surface) of the spindle 301. That is, the spindle 301 does not have a cut extending in the radial direction of the insertion hole 36 and communicating from the insertion hole 36 to the outside. Therefore, even when power (more specifically, torque of the motor 25) is transmitted from the swing pin 58 inserted into the insertion hole 36 to the spindle 301 in a direction crossing the axis A1, the spindle 301 is deformed. Hard to do.

  Further, since the transmission mechanism 5 is configured by a simple combination of the spindle 301 having the insertion hole 36 having a circular cross section and the columnar drive unit 582, the dimensional accuracy of each element can be kept good. As a result, the angle range when the spindle 301 is reciprocally rotated can be kept accurately. In the present embodiment, the eccentric shaft 51 and the connecting member 57 are also configured by a combination of a columnar member and a cylindrical member. Therefore, a more accurate transmission mechanism 5 is realized without increasing the manufacturing cost.

  Further, in the present embodiment, the spindle 301 provided with the insertion hole 36 functions as a part of the transmission mechanism 5. Therefore, the transmission mechanism 5 having a simpler and more compact configuration is realized as compared with the case where the power transmitted from the swing pin 58 is transmitted to the spindle 301 via another member.

  In the present embodiment, the motor 25, the spindle 301, and the transmission mechanism 5 are configuration examples corresponding to the “motor”, “spindle”, and “transmission mechanism” of the present invention, respectively. The spindle 301 and the swing pin 58 (drive unit 582) are configuration examples corresponding to the “first transmission element” and the “second transmission element” of the present invention, respectively. The insertion hole 36 is a configuration example corresponding to the “insertion hole” of the present invention. The eccentric shaft 51 is a configuration example corresponding to the “eccentric shaft” of the present invention. The connecting member 57 is a configuration example corresponding to the “connecting member” of the present invention.

[Third embodiment]
Hereinafter, the vibration tool 3 according to the third embodiment will be described with reference to FIGS. Most of the configuration of the vibration tool 3 of the present embodiment is the same as that of the second embodiment. Therefore, below, the same code | symbol is attached | subjected about the same structure, description is abbreviate | omitted or simplified, and a different point from 2nd embodiment is mainly demonstrated. The main difference from the second embodiment is the configuration of the transmission mechanism 50.

  As shown in FIGS. 10 to 12, in this embodiment, the spindle 30 is the same cylindrical member as that of the first embodiment, and no insertion hole is provided. Further, the transmission mechanism 50 includes an eccentric shaft 510, a connecting member 57, a swing pin 580, and a receiving member 59. The eccentric shaft 510 connected to the output shaft 26 of the motor 25 is the same as the eccentric shaft 51 except that the eccentric shaft 510 is shorter than the eccentric shaft 51 of the second embodiment. Therefore, the distance between the connecting member 57 mounted so as to be rotatable relative to the eccentric portion 55 of the eccentric shaft 510 and the spindle 30 is longer than the distance between the connecting member 57 and the spindle 301 in the second embodiment. . Like the swing pin 58 of the second embodiment, the swing pin 580 connected to the support pin 574 includes a cylindrical connection portion 581 and a columnar drive portion 583. The drive unit 583 is shorter than the drive unit 582 of the second embodiment.

  The receiving member 59 includes a fixed portion 591 and a driven portion 592 that are integrally formed. The fixed portion 591 is a cylindrical portion fixed to the outer peripheral surface of the spindle 30 between the bearings 31 and 32 in the vertical direction. The driven portion 592 is a cylindrical portion having an insertion hole 593, and the axis of the insertion hole 593 extends in a direction orthogonal to the axis A <b> 1 of the spindle 30. The shape of the cross section perpendicular to the axis of the insertion hole 593 is circular. In the present embodiment, the drive portion 583 of the swing pin 580 is inserted into the insertion hole 593 of the driven portion 592.

  In the present embodiment, the inner wall surface of the driven portion 592 surrounding the entire circumference of the insertion hole 593 is configured as a transmittable surface capable of transmitting power to and from the drive portion 583 inserted into the insertion hole 593. The drive unit 583 is configured to transmit power to the receiving member 59 in a direction intersecting the axis of the insertion hole 593.

  Hereinafter, with reference to FIG. 12 and FIG. 13, power transmission in the transmission mechanism 5 configured as described above will be described. In the transmission mechanism 50 of the present embodiment, power is transmitted in the same manner as the transmission mechanism 5 of the second embodiment except that the swing pin 580 rotates the spindle 30 via the receiving member 59. That is, with the rotation of the eccentric shaft 510, the cylindrical portion 571 moves around the axis A3 of the output shaft 26. The swing pin 580 whose movement in the vertical direction is restricted by the receiving member 59 fixed to the spindle 30 moves up and down relatively with respect to the support pin 574, and the axis A1 of the spindle 30 with the support pin 574 as a fulcrum. Oscillates in the horizontal direction intersecting (orthogonal to). As a result, the drive unit 583 slides in the insertion hole 593 of the receiving member 59 in the axial direction of the insertion hole 593, and in the direction intersecting the axis (more specifically, in the horizontal direction) Press the wall. Since the receiving member 59 is fixed to the spindle 30 by the fixing portion 591, the spindle 30 is rotated around the axis A <b> 1 together with the receiving member 59. Also in this embodiment, when the output shaft 26 rotates 360 degrees (that is, once), the tip tool 8 reciprocates once between the right position shown in FIG. 12 and the left position shown in FIG.

  As described above, in the transmission mechanism 50 of the present embodiment, the receiving member 59 having the insertion hole 593 having a circular cross section, the swinging pin 580 having the columnar driving portion 583 inserted in the insertion hole 593, An eccentric shaft 510 connected to the output shaft 26 of the motor 25, and a connecting member rotatably connected to the eccentric shaft 510 and rotatably supporting the swing pin 580 in a direction intersecting the axis A1 of the spindle 30. 57, the power is transmitted. The entire circumference of the insertion hole 593 is surrounded by the inner wall surface (transmittable surface) of the driven portion 592. That is, the driven portion 592 does not have a cut extending from the insertion hole 593 and communicating with the outside in the radial direction of the insertion hole 593. Therefore, even when power (more specifically, torque of the motor 25) is transmitted from the swing pin 580 inserted into the insertion hole 593 to the receiving member 59 in a direction intersecting the axis A1, the receiving member 59 is provided. The (driven portion 592) is not easily deformed.

  Further, since the transmission mechanism 50 is configured by a simple combination of the receiving member 59 having the insertion hole 593 having a circular cross section and the columnar drive unit 583, the dimensional accuracy of each element can be kept good. As a result, the angle range when the spindle 30 is reciprocally rotated can be maintained with high accuracy. In this embodiment, as in the second embodiment, the eccentric shaft 510 and the connecting member 57 are also composed of a combination of a columnar member and a cylindrical member. Therefore, a more accurate transmission mechanism 50 is realized without increasing the manufacturing cost.

  In the present embodiment, the motor 25, the spindle 30, and the transmission mechanism 50 are configuration examples corresponding to the “motor”, “spindle”, and “transmission mechanism” of the present invention, respectively. The receiving member 59 and the swing pin 580 (drive unit 583) are configuration examples corresponding to the “first transmission element” and the “second transmission element” of the present invention, respectively. The insertion hole 593 is a configuration example corresponding to the “insertion hole” of the present invention. The eccentric shaft 510 is a configuration example corresponding to the “eccentric shaft” of the present invention. The connecting member 57 is a configuration example corresponding to the “connecting member” of the present invention.

  The above-described embodiment is merely an example, and the work tool according to the present invention is not limited to the configuration of the exemplified vibration tools 1 to 3. For example, the changes exemplified below can be added. In addition, only one or a plurality of these changes can be adopted in combination with any of the vibration tools 1 to 3 shown in the embodiment or the invention described in the claims.

  From the viewpoint of vibration isolation, the housing of the vibration tools 1 to 3 preferably has a two-layer structure of the outer housings 12 and 120 and the inner housings 13 and 130 as described above. There is no need. In the case of the two-layer structure, the outer housings 12 and 120 may be connected to the inner housings 13 and 130 only by the elastic elements as described above, but in addition to the elastic elements, other members are interposed. May be connected. For example, an elastic element may be disposed between the interposed member provided on the outer side of the inner housings 13 and 130 and the outer housings 12 and 120, or the interposed member provided on the inner surfaces of the outer housings 12 and 120 and the inner member. An elastic element may be disposed between the housings 13 and 130. Further, the number and position of the elastic elements are not limited to those in the above embodiment, and the inner housings 13 and 130 and the outer housings 12 and 120 can be relatively moved in all directions (front and rear, left and right, and up and down directions). Changes can be made as long as elastic connection is possible.

  In the said embodiment, although the motors 20 and 25 which drive the battery 9 as a power supply are illustrated, the vibration tools 1-3 may be comprised so that it can replace with the battery 9 and an external power supply can be utilized. Specifically, the vibration tools 1 to 3 are configured such that a power cable that can be connected to an external power source and is electrically connected to the controller 7 is connected to the rear ends of the outer housings 12 and 120. Also good. When the motors 20 and 25 are direct current motors as described above, the controller 7 may be configured to have a function as a converter that converts alternating current supplied from an external power source into direct current. On the other hand, AC motors may be employed as the motors 20 and 25. In this case, the controller 7 does not need to have a function as a converter.

The transmission mechanism 4 of the vibration tool 1 of the first embodiment can be expressed as the following aspect.
The work tool according to claim 3,
An eccentric shaft connected to the output shaft of the motor and rotatably supported together with the output shaft;
Each of the link mechanisms is formed in a plate shape, extends in a direction intersecting the output shaft and the first axis, and has two link holes, a first link, a second link, and a third link A link, and a fourth link, each including a first pin, a second pin, a third pin, and a fourth pin formed in a cylindrical shape;
The second axis of each of the link holes of the first link, second link, third link, and fourth link extends parallel to the first axis;
The first pin is fixed in the work tool, and is inserted into one of the link holes of the first link to rotatably support the first link.
The second pin is inserted into the other one of the link holes of the first link and the one of the link holes of the second link to connect the first link and the second link so as to be relatively rotatable. And
The third pin is inserted into the other one of the link holes of the second link and the one of the link holes of the third link to connect the second link and the third link so as to be relatively rotatable. And
The fourth pin is inserted into the other one of the link holes of the third link and the one of the link holes of the fourth link to connect the third link and the fourth link so as to be relatively rotatable. And
The spindle is inserted and fixed to the other of the link holes of the fourth link,
The second link is attached to the outer peripheral portion of the eccentric shaft so as to be relatively rotatable,
Each of the first link, the second link, the third link, and the fourth link functions as the first transmission element,
Each of said 1st pin, said 2nd pin, said 3rd pin, and said 4th pin functions as said 2nd transmission element, The work tool characterized by the above-mentioned.

  Further, the transmission mechanism 4 of the first embodiment may be configured by a link mechanism different from that illustrated. Specifically, the number and shape of the links 40, the number of the link holes 400 and the pins 45 (joint portions), the arrangement positions of the pins 45 functioning as fixed points, and the like are set in the angle range in which the spindle 30 is reciprocally rotated. Depending on the situation, it can be changed as appropriate. Further, for example, by making the arrangement position of the pin 45 functioning as a fixed point variable, the angle range in which the spindle 30 is reciprocally rotated (the swing angle range of the tip tool 8) can be made variable. For example, a configuration in which the arrangement position of the pin 45 can be switched at a plurality of predetermined positions or a configuration that can be changed steplessly can be employed.

  The eccentric shafts 51 and 510 of the transmission mechanisms 5 and 50 and the connecting member 57 of the vibration tools 2 and 3 may be configured so that the rotational motion of the output shafts 51 and 510 can be converted into the swing motion of the swing pins 58 and 580. The shape and the like can be changed as appropriate.

1, 2, 3 Electric vibration tool 12, 120 Outer housing 123 Grasping area 125 Battery mounting part 13, 130 Inner housing 131 Front area 132 Central area 134 Rear area 20, 25 Motor 21, 26 Output shaft 30, 301 Spindle 31 32 Bearing 35 Tool mounting part 351 Screw hole 36 Insertion hole 37 Fixing screw 371 Fixing part 4, 5, 50 Transmission mechanism 40 Link 400, 411, 412, 421, 422, 431, 432, 441, 442 Link hole 401, 51 , 510 Eccentric shafts 402, 403, 52 Bearings 405, 55 Eccentric portion 41 First link 42 Second link 424 Through hole 425 Drive bearing 43 Third link 44 Fourth link 45 Pin 46 First pin 47 Second pin 48 Third Pin 49 Fourth pin 57 Connecting member 571 Tubular part 5 2 drive bearings 573 support hole 574 supporting pins 58,580 pivot shaft 581 receiving the connection portions 582 and 583 drive section 59 member 591 fixed portion 592 driven part 593 insertion hole 7 Controller 8 tool bit 9 Battery

Claims (5)

A work tool that drives a tip tool to perform a machining operation on a workpiece,
A motor,
A spindle having a tool mounting portion rotatably supported around a first axis and configured to be detachable from the tip tool;
A transmission mechanism configured to transmit power generated by driving the motor to the spindle, and to reciprocately rotate the spindle within a predetermined angular range around the first axis;
The transmission mechanism is
An insertion hole extending along a second axis, the first transmission element having an insertion hole having a circular cross section perpendicular to the second axis;
A cylindrical second transmission element inserted into the insertion hole,
The inner wall surface of the first transmission element surrounding the entire circumference of the insertion hole is configured as a transmittable surface capable of transmitting the power to and from the second transmission element,
The second transmission element inserted into the insertion hole is configured to transmit power in a direction intersecting the second axis with the first transmission element. . The work tool according to claim 1,
The second transmission element is in a direction intersecting the second axis with respect to the first transmission element in a state in which relative movement in the circumferential direction of the second axis with respect to the first transmission element is allowed. A work tool characterized by being configured to transmit power to the motor. The work tool according to claim 2,
The motor has an output shaft, and the output shaft is arranged to extend parallel to the first axis,
The transmission mechanism is a link mechanism configured by combining a plurality of links,
Each of the plurality of links has a link hole defining a joint portion, and is connected to another link by a pin inserted into the link hole,
Each of the plurality of links functions as the first transmission element having the link hole as the insertion hole,
The said pin functions as said 2nd transmission element, The work tool characterized by the above-mentioned. The work tool according to claim 3,
An inner housing that houses the motor, the spindle, and the transmission mechanism;
An outer housing that houses the inner housing and is connected to the inner housing via an elastic element;
The work tool, wherein the pin that functions as a fixing point in the link mechanism is fixed to the inner housing. The work tool according to claim 1,
The motor has an output shaft, and is arranged so that the output shaft extends in a direction intersecting the first axis.
The second axis is orthogonal to the first axis;
The spindle also serves as the first transmission element and has the insertion hole extending along the second axis;
The transmission mechanism is
An eccentric shaft coupled to the output shaft and supported rotatably with the output shaft;
A connecting member that is rotatably connected to the eccentric shaft and that rotatably supports the second transmission element in a direction intersecting the first axis;
The work tool, wherein the second transmission element is inserted into the insertion hole of the spindle.

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