JP2017144541A - Working tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique conducible for restraining deterioration of working efficiency in a tip tool in a working tool for processing a workpiece by driving the tip tool.SOLUTION: A working tool 1 comprises: a long inner housing 13; an outer housing 12 connected to the inner housing 13 via elastic elements 91 to 94; a motor 20; a spindle 30; and a transmission mechanism 40. The spindle 30 is supported rotatably around a shaft line A2 in the inner housing 13 and has a tool-loading part 35 configuring the tip tool 8 detachably. The transmission mechanism 40 is housed inside the inner housing 13 and is configured to transmit the rotation of an output shaft 21 of the motor 20 to the spindle 30 and to reciprocatingly turn the spindle 30 in a prescribed angle range around an axis line A2. The spindle 30 is disposed in the front end area 131 of the inner housing 13, and the motor 20 is disposed in the rear end area 132 thereof.SELECTED DRAWING: Figure 1

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 hand-held work tool configured to swing a tool mounted on the lower end of a drive shaft by a drive unit. This work tool is formed in an elongated shape, and an outer housing forms an outer shell thereof. A tool placement region including a spindle is provided at the front end portion of the work tool, and a drive unit is disposed in the outer housing adjacent to the rear of the tool placement region. The area of the outer housing corresponding to the area where the drive unit is disposed is a gripping area that can be gripped by the user.

US Patent Application Publication No. 2015/0034347

  In the work tool, the outer housing and the driving element (the driving unit and the tool placement region) are connected via a transmission member that can be elastically deformed. As a result, transmission of vibration and the like from the drive element to the outer housing (particularly the grip portion) is suppressed, and comfort during use is improved. On the other hand, since the drive element is allowed to move slightly with respect to the outer housing, when a certain load is applied to the tip tool, the inner housing swings within the outer housing gripped by the user with the tip tool as a fulcrum. As a result, the working efficiency of the tip tool may be reduced.

  An object of the present invention is to provide a technique that contributes to suppressing a decrease in work efficiency of a tip tool 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 an inner housing, an outer housing, a motor, a spindle, and a transmission mechanism.

  The inner housing is formed in a long shape. The outer housing accommodates the inner housing and is connected to the inner housing via an elastic element. In other words, the elastic element is interposed between the outer housing and the inner housing. For example, the outer housing may be connected to the inner housing only by the elastic element, or the outer housing and the inner housing may be connected via the elastic element and other members. The outer housing is preferably elastically connected to the inner housing at a plurality of locations so as to be relatively movable in all directions (front and rear, left and right, up and down directions of the work tool). A typical example of the elastic element is rubber, but it may be an element formed of another elastic material. Each of the inner housing and the outer housing may be formed of only one part, or may be formed by combining a plurality of parts.

  The motor has an output shaft and is accommodated in the inner housing. 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 is supported so as to be rotatable around a predetermined axis within the inner housing. The spindle has a tool mounting portion configured to be detachable from the tip tool. The transmission mechanism is housed inside the inner housing, and is configured to transmit the rotational motion of the output shaft of the motor to the spindle and to reciprocate the spindle within a predetermined angular range around the axis.

  Further, the spindle is arranged in a front end region defined by one end region in the major axis direction of the inner housing. On the other hand, the motor is arranged in a rear end region defined by an end region opposite to the front end region with respect to the longitudinal direction of the inner housing.

  In this way, in the elongated inner housing, the spindle is arranged in the front end region and the motor is arranged in the rear end region, so that the spindle is centered compared to the case where the motor is arranged adjacent to the spindle. The inertia moment of the inner housing can be increased with respect to the oscillation described above. Therefore, even when a certain amount of load is applied to the tip tool, the inner housing is less likely to swing around the tip tool as a fulcrum. As a result, unnecessary movement of the inner housing relative to the outer housing during operation is suppressed, and the tip tool can reliably perform a machining operation on the workpiece, thereby suppressing a reduction in work efficiency of the tip tool. be able to. Further, vibration itself generated in the inner housing can be reduced.

  As one aspect of the work tool according to the present invention, the inner housing may have an intermediate region between the front end region and the rear end region. And the area | region corresponding to an intermediate | middle area | region in an outer housing may be comprised as a holding | grip area | region hold | gripped by the user. Since the motor is arranged in the rear end region and not in the intermediate region, the gripping region of the outer housing corresponding to the intermediate region can be designed without being restricted by the arrangement of the motor.

  As one aspect of the work tool according to the present invention, the motor and the spindle may be arranged such that the output shaft of the motor and the axis of the spindle extend in parallel. The transmission mechanism may include an intermediate shaft, a belt-like member, and a motion conversion mechanism. The intermediate shaft is supported rotatably about the output shaft and another axis parallel to the axis. The belt-like member is spanned between the output shaft and the intermediate shaft of the motor, and is configured to transmit the rotational motion of the output shaft to the intermediate shaft to rotate the intermediate shaft. A shaft that is rigidly connected coaxially to the output shaft and rotates integrally with the output shaft may be interpreted as a part of the output shaft. The motion conversion mechanism is configured to transmit the rotational motion of the intermediate shaft to the spindle and to reciprocately rotate the spindle within a predetermined angular range around the axis. By arranging the motor and the spindle as described above, the spindle can be driven by a transmission mechanism having a simple configuration using a belt-like member while arranging the motor in the rear end region. A typical example of the belt-shaped member is a belt or a chain. The type of belt is not particularly limited, and a flat belt, a V belt, a toothed belt, or the like can be used.

  As one aspect of the work tool according to the present invention, the transmission mechanism further includes a first wheel provided on the output shaft of the motor and a second wheel provided on the intermediate shaft and having a diameter different from that of the first wheel. May be. The belt-shaped member may be bridged between the first wheel and the second wheel. In this case, the rotational speed of the output shaft and the rotational speed of the intermediate shaft can be made different with a simple configuration in which two wheels having different diameters are provided on the output shaft and the intermediate shaft. As the first wheel and the second wheel, for example, a pulley can be used when the belt-shaped member is a belt, and a sprocket can be used when the belt-shaped member is a chain.

  As one mode of the work tool according to the present invention, the motor and the spindle may be arranged so that the output shaft of the motor and the axis intersect. The transmission mechanism may include a connecting shaft and a motion conversion mechanism. The connecting shaft is connected to the output shaft of the motor and is rotatably supported together with the output shaft. The connecting shaft may be composed of a single shaft, or may be composed of a plurality of portions that are coupled to each other and rotate integrally. The motion conversion mechanism is configured to transmit the rotational motion of the connecting shaft to the spindle and to reciprocately rotate the spindle within a predetermined angular range around the axis. Even when the motor and the spindle are arranged as described above, the spindle can be driven by the transmission mechanism using the connecting shaft and the motion conversion mechanism while arranging the motor in the rear end region. The connecting shaft may be connected coaxially with the output shaft. In this case, it is possible to minimize the size of the connecting shaft portion in the radial direction of the axis of the output shaft of the motor, and hence the diameter of the portion corresponding to this portion in the inner housing and the outer housing.

  As one aspect of the work tool according to the present invention, the work tool may further include a battery. The battery may be detachably mounted on a battery mounting portion provided in the outer housing. By providing the battery mounting portion in the outer housing with less vibration than the inner housing, the durability of the battery mounting portion can be enhanced. Moreover, since the mass of the entire outer housing can be increased by the attached battery, it is possible to realize further lower vibration of the outer housing as compared with the case where the battery is not attached.

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 a front-back direction sectional view of a vibration tool concerning the modification of a first embodiment. It is a front-back direction longitudinal cross-sectional view of the vibration tool which concerns on 2nd embodiment. It is a transverse cross section of a vibration tool in the axis of a motor (however, only an internal structure). It is a perspective view which shows the internal structure of a vibration tool.

  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 FIG. 1 and FIG. 2, the vibration tool 1 which concerns on 1st embodiment is demonstrated. First, a schematic 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 A2 of the spindle 30 is the vertical direction, the direction orthogonal to the axis A2 and the direction in which the inner housing 13 extends is the front-back direction. To do. This direction definition is also applied to a second embodiment 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. A front end region of the inner housing 13 is referred to as a front end region 131, a rear end region is referred to as a rear end region 132, and a region between the front end region 131 and the rear end region 132 is referred to as an intermediate region 133. In the present embodiment, since the front-rear direction is the major axis direction of the inner housing 13, the front end region 131 is one end region in the major axis direction of the inner housing 13, and the rear end region 132 is the opposite end portion. It can also be defined as a region. The inner housing 13 accommodates the motor 20, the spindle 30, and the transmission mechanism 40. Here, “accommodating” does not necessarily mean that the entire motor 20, spindle 30, and transmission mechanism 40 are completely covered by the inner housing 13. The case where it exposes to the exterior of the housing 13 is also included.

  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 intermediate region 133 of the inner housing 13 is configured as a gripping region 123. The grip region 123 functions as a part that can be gripped by the user. Further, the outer housing 12 is elastically connected to the inner housing 13 so as to be relatively movable.

  A controller 7 is disposed on the rear side of the inner housing 13 in the outer housing 12. The battery 9 is detachably mounted on the battery mounting portion 125 provided at the rear end portion of the outer housing 12. The outer housing 12 is provided with a slide switch (not shown) and a speed change dial (not shown). The battery mounting part 125 and the slide switch are electrically connected to the controller 7. 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.

  Hereinafter, the detail of the component of the vibration tool 1 is demonstrated. First, the arrangement relationship of the components inside the inner housing 13 will be described. As shown in FIG. 1, the spindle 30 is disposed in the front end region 131 of the inner housing 13. In the present embodiment, most of the transmission mechanism 40 described later is further disposed in the front end region 131. On the other hand, the motor 20 is disposed in the rear end region 132. The front end region 131 and the rear end region 132 have a height (length in the vertical direction) for accommodating such components inside. On the other hand, the intermediate region 133 of the present embodiment is configured as a portion that connects the front end region 131 and the rear end region 132 while maintaining appropriate strength because there is no particular component to be accommodated therein. Therefore, the height of the intermediate region 133 is set smaller than that of the front end region 131 and the rear end region 132.

  Next, the motor 20, the spindle 30, and the transmission mechanism 40 housed in the inner housing 13 will be described in order with reference to FIGS.

  The motor 20 disposed in the rear end region 132 is disposed inside the inner housing 13 so that the axis A1 extends in the vertical direction of the vibration tool 1. The output shaft 21 of the motor 20 protrudes downward, and a connecting shaft 22 is connected coaxially with the output shaft 21 at the tip. The connecting shaft 22 is rotatably supported by a bearing 23 held by the inner housing 13. In this embodiment, since the motor 20 is small and has high output, a brushless DC motor is employed.

  The spindle 30 disposed in the front end region 131 is a substantially cylindrical long member. The spindle 30 is arranged such that its axis A2 extends in parallel with the motor axis A1. 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 spindle 30 is supported by the bearings 31 and 32 so as to be rotatable around the axis A2 at two locations in the vertical direction so that the axis A2 extends in the vertical direction of the vibration tool 1. The bearings 31 and 32 are held by the inner housing 13. The tip (lower end) of the spindle 30 protrudes below the front end region 131 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 A2. 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.

  The transmission mechanism 40 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 A2. That is, the transmission mechanism 40 is configured to drive the tip tool 8 to swing around the spindle 30. The transmission mechanism 40 according to this embodiment includes an intermediate shaft 41, a drive bearing 42, a swing arm 43, a first pulley 45, a second pulley 46, and a belt 49.

  The intermediate shaft 41 is disposed in parallel to the axis A1 of the output shaft 21 of the motor 20 and the axis A2 of the spindle 30. In the present embodiment, the intermediate shaft 41 is rotatably supported by the bearings 411 and 412 at the upper end portion and the intermediate portion so that the axis A3 extends in the vertical direction. The bearings 411 and 412 are held by the inner housing 13. The intermediate shaft 41 has an eccentric portion 415 that is eccentric with respect to the axis A3 between the bearings 411 and 412. A drive bearing 42 is provided on the outer peripheral portion of the eccentric portion 415. The swing arm 43 is a member that connects the drive bearing 42 and the spindle 30. The swing arm 43 includes a fixed portion 431 and an arm portion 432. The fixed portion 431 is an annular portion fixed to the outer peripheral portion of the spindle 30. The arm portion 432 is a portion that extends from the fixed portion 431 in a bifurcated manner to the left and right. The rear end portion of the arm portion 432 is disposed so as to contact the outer peripheral portion of the outer ring of the drive bearing 42 with the drive bearing 42 sandwiched from the left and right.

  A lower end portion of the connecting shaft 22 that is rigidly connected coaxially to the output shaft 21 of the motor 20 protrudes downward from a rear end region 132 of the inner housing 13. A first pulley 45 is fixed to the lower end portion of the connecting shaft 22. The lower end portion of the intermediate shaft 41 protrudes downward from the front end region 131 of the inner housing 13. A second pulley 46 having the same diameter as the first pulley 45 is fixed to the lower end portion of the intermediate shaft 41. A belt 49 is bridged between the first pulley 45 and the second pulley 46. Therefore, in the present embodiment, the first pulley 45, the second pulley 46, and the belt 49 in the transmission mechanism 40 are disposed outside the inner housing 13. The belt 49 may be configured to transmit the rotational motion of the output shaft 21 to the intermediate shaft 41 via the connecting shaft 22 and rotate the intermediate shaft 41, and the type thereof is not particularly limited. For example, a flat belt, a V belt, or a toothed belt can be used.

  When the motor 20 is driven, the connecting shaft 22 rotates together with the output shaft 21. The rotational movement of the connecting shaft 22 is transmitted to the intermediate shaft 41 via the belt 49, and the intermediate shaft 41 is rotated. As described above, since the first pulley 45 and the second pulley 46 have the same diameter, the rotation of the output shaft 21 is transmitted to the intermediate shaft 41 without being accelerated or decelerated. As the intermediate shaft 41 rotates, the center of the eccentric portion 415 moves (circulates) around the axis A3 of the intermediate shaft 41, so that the drive bearing 42 provided on the outer peripheral portion of the eccentric portion 415 also moves (circulates). Thereby, the swing arm 43 is swung within a predetermined angle range in the horizontal direction with the spindle 30 as a fulcrum. Since the swing arm 43 is fixed to the spindle 30 by the fixing portion 431, the spindle 30 reciprocates within a predetermined angular range as the swing arm 43 swings. As a result, the tip tool 8 sandwiched between the tool mounting portion 35 and the fixing screw 37 is driven to swing, and a predetermined processing operation (for example, cutting, grinding, polishing, etc.) can be performed.

  As described above, the eccentric portion 415, the drive bearing 42, and the swing arm 43 of the intermediate shaft 41 transmit the rotational motion of the intermediate shaft 41 to the spindle 30 and reciprocate the spindle 30 within a predetermined angular range around the axis A2. It functions as a motion conversion mechanism configured to rotate. The motion conversion mechanism having such a function is not limited to the above configuration example, and other configurations may be adopted.

  The configuration of the outer housing 12 will be described with reference to FIG. 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 is shown in which the outer housing 12 is connected to the inner housing 13 via four elastic elements 91 to 94 arranged at four locations. The elastic elements 91 and 92 are respectively disposed between the upper end and lower end of the outer surface of the front end portion of the inner housing 13 and the inner surface of the front end portion of the outer housing 12. The elastic element 93 is interposed between the lower end portion of the front end region 131 of the inner housing 13 and the lower inner surface of the outer housing 12. The elastic element 94 is interposed between the lower end portion of the rear end region 132 of the inner housing 13 and the lower inner surface of the outer housing 12. In addition, although the anti-vibration rubber is mentioned as a typical example of the elastic elements 91-94, the elastic elements 91-94 may be formed with the material which has elasticity other than an anti-vibration rubber.

  As described above, the outer housing 12 and the inner housing 13 are elastically coupled so as to be relatively movable so that the motor 20, the spindle 30 and the transmission mechanism 40 (particularly, the spindle 30) accommodated in the inner housing 13 are driven. It is possible to suppress the vibration generated due to the transmission to the outer housing 12.

  As described above, the gripping region 123 of the outer housing 12 is a region corresponding to the intermediate region 133 of the inner housing 13. As the height of the intermediate region 133 is smaller than the front end region 131 and the rear end region 132, the height of the grip region 123 is also set smaller than the height of the front end portion and the rear end portion of the outer housing 12. Yes. Thereby, the diameter of the grip region 123 is thinner than other portions, and is configured to be easily gripped by the user.

  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.

  In the present embodiment, the rear end region 132 of the inner housing 13 is disposed in the region of the rear end portion of the outer housing 12. That is, the motor 20 is disposed in the region of the rear end portion of the outer housing 12. The controller 7 arranged behind the rear end region 132 is also arranged in the region of the rear end portion of the outer housing 12. As described above, the battery mounting portion 125, the motor 20, and the controller 7 are arranged in the vicinity of each other within the region of the rear end portion of the outer housing 12, thereby facilitating wiring.

  As described above, the vibration tool 1 of the present embodiment accommodates the long inner housing 13 and the inner housing 13 and is connected to the inner housing 13 via the elastic elements 91 to 94. The outer housing 12 is provided. The spindle 30 is disposed in the front end region 131 of the inner housing 13, while the motor 20 is disposed in the rear end region 132. According to such a configuration, the inertia moment of the inner housing 13 can be increased with respect to the swing about the spindle 30 as compared with the case where the motor 20 is disposed adjacent to the spindle 30. Therefore, even when a certain load is applied to the tip tool 8, the inner housing 13 is less likely to swing around the tip tool 8 as a fulcrum. As a result, unnecessary movement of the inner housing 13 with respect to the outer housing 12 during operation is suppressed, and the tip tool 8 can work firmly on the workpiece, thereby suppressing a reduction in work efficiency of the tip tool 8. can do. Further, vibration itself generated in the inner housing 13 can be reduced.

  In the present embodiment, the inner housing 13 has an intermediate region 133 between the front end region 131 and the rear end region 132, and the region corresponding to the intermediate region 133 in the outer housing 12 is a grip region gripped by a user. It is comprised as 123. Since the motor 20 is not disposed in the intermediate region 133, the intermediate region 133 and thus the gripping region 123 can be designed without being restricted by the arrangement of the motor 20. Therefore, the thickness and shape of the grip region 123 can be set in consideration of ease of gripping by the user.

  In the present embodiment, the motor 20 and the spindle 30 are arranged such that the axis A1 and the axis A2 extend in parallel. An intermediate shaft 41 having an axis A3 parallel to the axis A1 and the axis A2 is disposed between the motor 20 and the spindle 30 in the long axis direction of the inner housing 13. The rotational movement of the output shaft 21 is transmitted to the intermediate shaft 41 by a belt 49 spanned between the connecting shaft 22 connected to the output shaft 21 and the intermediate shaft 41, and further, the drive bearing 42 and the swing arm 43. Thus, the rotary motion of the intermediate shaft 41 is converted into the swing motion of the swing arm 43, whereby the spindle 30 is reciprocated within a predetermined angle range. With this configuration, the spindle 30 can be driven by the transmission mechanism 40 having a simple configuration using the belt 49 while the motor 20 is disposed in the rear end region 132.

  In the present embodiment, the first pulley 45 and the second pulley 46 around which the belt 49 that transmits the rotational motion from the connecting shaft 22 to the intermediate shaft 41 is spanned have the same diameter, but pulleys having different diameters are employed. May be. FIG. 3 shows a vibration tool 2 of such a modification. In addition, since the vibration tool 2 has the same configuration as the vibration tool 1 except for the pulley, the configuration other than the pulley is denoted by the same reference numeral and description thereof is omitted.

  As shown in FIG. 3, in the vibration tool 2, the diameter of the first pulley 47 provided on the connecting shaft 22 is the same as the diameter of the first pulley 45 of the first embodiment. The diameter of the second pulley 48 provided on the intermediate shaft 41 is larger than the diameter of the first pulley 47 provided on the connecting shaft 22. Therefore, when the rotation of the output shaft 21 is transmitted to the intermediate shaft 41, the rotation speed is reduced. That is, the first pulley 47 and the second pulley 48 function as a speed reduction mechanism. The swing speed of the tip tool 8 (the number of swings per unit time) is slower than in the first embodiment. Contrary to this modified example, when the diameter of the first pulley 47 is larger than the diameter of the second pulley 48, the first pulley 47 and the second pulley 48 function as a speed increasing mechanism. Thus, a speed change mechanism can be realized with a simple configuration using two pulleys having different diameters.

[Second Embodiment]
Hereinafter, the vibration tool 3 according to the second embodiment will be described with reference to FIGS. 4 to 6. The configuration of the vibration tool 3 of the present embodiment is the same as the configuration of the vibration tool 1 of the first embodiment except for the inner housing 14 and the internal configuration thereof. 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.

  As shown in FIGS. 4 to 6, the vibration tool 3 includes an outer housing 12 that forms an outline of the vibration tool 3, and an inner housing 14 accommodated in the outer housing 12. The inner housing 14 accommodates a motor 25, a spindle 30, and a transmission mechanism 50. Similar to the inner housing 13 of the first embodiment, the inner housing 14 includes a front end region 141, a rear end region 142, and an intermediate region 143. The spindle 30 is disposed in the front end region 141, and the motor 25 is disposed in the rear end region 142. In the present embodiment, the motor 25 is a DC motor having a brush. The motor 25 is arranged such that its output shaft 26 projects forward and the axis A4 of the output shaft 26 extends in the front-rear direction. As in the first embodiment, the spindle 30 is arranged such that the axis A2 extends in the vertical direction. That is, the motor 25 and the spindle 30 are arranged such that the axis A4 and the axis A2 intersect (more specifically, orthogonal).

  Also in this embodiment, the transmission mechanism 50 is configured to transmit the rotational motion of the motor 25 to the spindle 30 and to reciprocately rotate the spindle 30 within a predetermined angular range around the axis A2. The transmission mechanism 50 includes a connecting shaft portion 51, a drive bearing 52, and a swing arm 53. A part of the connecting shaft portion 51 of the transmission mechanism 50 is disposed in the intermediate region 143. The height of the intermediate region 143 is set larger than the height of the intermediate region 133 of the first embodiment because the connecting shaft portion 51 is disposed inside, but is higher than the heights of the front end region 141 and the rear end region 142. Is set slightly smaller.

  The connection shaft portion 51 includes a first connection shaft 511, a coupling 515, and a second connection shaft 516. The first connecting shaft 511 is rigidly connected to the tip of the output shaft 26 of the motor 25 so as to be coaxial with the output shaft 26. The first connecting shaft 511 is rotatably supported by a bearing 513 held by the inner housing 14. The coupling 515 connects the first connecting shaft 511 and the second connecting shaft 516 coaxially. The second connecting shaft 516 is rotatably supported by bearings 517 and 518 held by the inner housing 14. With this configuration, the connecting shaft portion 51 rotates integrally with the output shaft 26 as one shaft portion. The second connecting shaft 516 has an eccentric portion 519 eccentric to the axis A4 at the front end. A drive bearing 52 is provided on the outer peripheral portion of the eccentric portion 519. The swing arm 53 includes a fixed portion 531 and an arm portion 532 configured in the same manner as the swing arm 43 of the first embodiment.

  When the motor 25 is driven, the connecting shaft portion 51 rotates together with the output shaft 26. As the second connecting shaft 516 rotates, the center of the eccentric portion 519 moves (circulates) around the axis A4, so that the drive bearing 52 provided on the outer peripheral portion of the eccentric portion 519 also moves (circulates). Thereby, the swing arm 53 is swung within a predetermined angle range in the horizontal direction with the spindle 30 as a fulcrum. Since the swing arm 53 is fixed to the spindle 30 by the fixing portion 531, the spindle 30 reciprocates within a predetermined angle range as the swing arm 53 swings. As a result, the tip tool 8 mounted on the tool mounting portion 35 is driven to swing.

  As described above, the eccentric portion 519, the drive bearing 52, and the swing arm 53 of the second connecting shaft 516 transmit the rotational motion of the connecting shaft portion 51 to the spindle 30, and the spindle 30 is in a predetermined angular range around the axis A2. It functions as a motion conversion mechanism that is configured to reciprocally rotate within. The motion conversion mechanism having such a function is not limited to the above configuration example, and other configurations may be adopted.

  Also in this embodiment, the outer housing 12 is elastically connected to the inner housing 14 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). 4 shows a state in which the outer housing 12 is connected to the inner housing 14 via four elastic elements 95 to 98 arranged at four locations. The elastic elements 95 and 96 are respectively disposed between the upper end and lower end of the outer surface of the front end portion of the inner housing 14 and the inner surface of the front end portion of the outer housing 12. The elastic element 97 is interposed between the lower end portion of the rear end region 142 of the inner housing 14 and the lower inner surface of the outer housing 12. The elastic element 98 is disposed between the upper end portion of the rear end region 142 of the inner housing 14 and the upper inner surface of the outer housing 12.

  As described above, the vibration tool 3 of the present embodiment also includes the long inner housing 14 and the inner housing 14 as well as the vibration tool 1 of the first embodiment. And an outer housing 12 connected through elastic elements 95 to 98. The spindle 30 is disposed in the front end region 141 of the inner housing 14, while the motor 25 is disposed in the rear end region 142. Therefore, according to the vibration tool 3, similarly to the vibration tool 1, a reduction in work efficiency of the tip tool 8 can be suppressed, and vibration itself generated in the inner housing 14 can also be reduced.

  Further, in the vibration tool 3, the motor 25 and the spindle 30 are arranged in a direction in which the axis A4 and the axis A2 intersect. The output shaft 26 is connected to a connecting shaft portion 51 that rotates coaxially with the output shaft 26. The rotational movement of the connecting shaft portion 51 is converted into the swinging motion of the swinging arm 53 by the drive bearing 52 and the swinging arm 53, so that the spindle 30 is reciprocated within a predetermined angle range. Under the arrangement relationship between the motor 25 and the spindle 30 as described above, the connecting shaft 51 connected coaxially with the output shaft 26 of the motor 25 is used, so that the connecting shaft is connected in the radial direction of the axis A4 of the output shaft 26. It is possible to minimize the size of the portion 51 and, in turn, the diameter of the inner housing 14 and the outer housing 12 corresponding to this portion. More specifically, the diameter of the intermediate region 143 of the inner housing 14 and the gripping region 123 of the outer housing 12 can be minimized. Therefore, the thickness and shape of the grip region 123 can be set in consideration of ease of gripping by the user.

  Although a detailed description is omitted, in addition to the above, the vibration tool 3 can also provide the same operation and effect as the vibration tool 1 of the first embodiment.

  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.

  The outer housing 12 may be connected to the inner housings 13 and 14 only by elastic elements as in the above embodiment, but may be connected via other members in addition to the elastic elements. For example, an elastic element may be disposed between the interposed member provided on the outer side of the inner housings 13 and 14 and the outer housing 12, or the interposed member provided on the inner surface of the outer housing 12 and the inner housings 13 and 14. An elastic element may be disposed between the two. Further, the number and position of the elastic elements are not limited to those in the above embodiment, and the inner housings 13 and 14 and the outer housing 12 are elastically connected so as to be relatively movable in all directions (front and rear, left and right, up and down directions) Changes can be made to the extent possible.

  In the above-described embodiment, the belt 49 is bridged between the first pulleys 45 and 47 provided on the connecting shaft 22 and the second pulleys 46 and 48 provided on the intermediate shaft 41. A belt may be bridged between a pulley provided directly on the output shaft 21 and a pulley provided on the intermediate shaft 41. Further, for the transmission between the output shaft 21 and the intermediate shaft 41, a combination of a chain and a sprocket may be employed instead of the combination of a belt and two pulleys.

  In the above embodiment, the connecting shaft portion 51 is configured by a plurality of members (first connecting shaft 511, coupling 515, second connecting shaft 516), but is connected coaxially to the output shaft 26 and the output shaft 26. It may be changed to a single axis that rotates together. The connecting shaft that transmits the rotation of the output shaft 26 to the swing arm 53 is preferably connected coaxially with the output shaft 26 so that the user can easily grip the grip region 123. However, the shaft that transmits the rotation of the output shaft 26 to the swing arm 53 is not necessarily connected to the output shaft 26 coaxially. For example, a configuration may be employed in which the rotation of the output shaft 26 is transmitted to the swing arm 53 via an axis parallel to the output shaft 26 or an axis extending obliquely with respect to the output shaft 26 and a gear.

  In the above embodiment, the motors 20 and 25 are disposed at the rear ends of the rear end regions 132 and 142 of the inner housings 13 and 14. However, the motors 20 and 25 are not necessarily arranged at the rearmost end of the inner housing 13 but may be arranged in the rear end regions 132 and 142. For example, the controller 7 may be disposed behind the motors 20 and 25 in the rear end regions 132 and 142. Further, the battery mounting portion 125 may be provided not at the outer housing 12 but at the rear ends of the inner housings 13 and 14.

  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 may be 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 end portion of the outer housing 12. . 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 correspondence between each component of the above embodiment and each component of the present invention is shown below. The vibration tools 1, 2, and 3 are configuration examples corresponding to the “work tools” of the present invention. Each of the inner housings 13 and 14 is a configuration example corresponding to the “inner housing” of the present invention. The front end regions 131 and 141 are configuration examples corresponding to the “front end region” of the present invention. The rear end regions 132 and 142 are configuration examples corresponding to the “rear end region” of the present invention. The intermediate regions 133 and 134 are configuration examples corresponding to the “intermediate region” of the present invention. The outer housing 12 is a configuration example corresponding to the “outer housing” of the present invention. The grip area 123 is a configuration example corresponding to the “grip area” of the present invention. Each of the elastic elements 91 to 98 is a configuration example corresponding to the “elastic element” of the present invention. Each of the motors 20 and 25 is a configuration example corresponding to the “motor” of the present invention. The spindle 30, the tool mounting portion 35, and the axis A2 are configuration examples corresponding to the “spindle”, “tool mounting portion”, and “predetermined axis” of the present invention, respectively. The intermediate shaft 41, the drive bearing 42, the swing arm 43, the first pulley 45, the second pulley 46, and the belt 49 are configuration examples corresponding to the “transmission mechanism” of the present invention. The connecting shaft portion 51, the drive bearing 52, and the swing arm 53 are configuration examples corresponding to the “transmission mechanism” of the present invention. The intermediate shaft 41, the belt 49, the first pulleys 45 and 47, and the second pulleys 46 and 48 correspond to the “intermediate shaft”, “strip member”, “first wheel”, and “second wheel” of the present invention, respectively. It is the example of a structure to do. The eccentric portion 415, the drive bearing 42, and the swing arm 43 are configuration examples corresponding to the “motion conversion mechanism” of the present invention. The connecting shaft portion 51 is a configuration example corresponding to the “connecting shaft” of the present invention. The eccentric portion 519, the drive bearing 52, and the swing arm 53 are configuration examples corresponding to the “motion conversion mechanism” of the present invention. The battery mounting part 125 and the battery 9 are configuration examples corresponding to the “battery mounting part” and “battery” of the present invention, respectively.

1, 2, 3 Electric vibration tool 12 Outer housing 123 Grasping area 125 Battery mounting part 13, 14 Inner housing 131, 141 Front area 132, 142 Rear area 133, 143 Intermediate area 20, 25 Motor 21, 26 Output shaft 22 Connecting shaft 23 Bearing 30 Spindle 31 Bearing 32 Bearing 35 Tool mounting portion 351 Screw hole 37 Fixing screw 371 Fixing portion 40, 50 Transmission mechanism 41 Intermediate shaft 411 Bearing 412 Bearing 415 Eccentric portion 42, 52, Drive bearing 43, 53 Oscillating arm 431, 531 Fixed portion 432, 532 Arm portion 45, 47 First pulley 46, 48 Second pulley 49 Belt 51 Connection shaft portion 511 First connection shaft 513 Bearing 515 Coupling 516 Second connection shaft 517 Bearing 518 Bearing 5 9 eccentric portion 7 Controller 8 tip tool 9 battery 91,92,93,94,95,96,97,98 elastic element

Claims (6)

A work tool that drives a tip tool to perform a machining operation on a workpiece,
An elongated inner housing;
An outer housing that houses the inner housing and is connected to the inner housing via an elastic element;
A motor having an output shaft housed in the inner housing;
A spindle having a tool mounting portion that is rotatably supported around a predetermined axis inside the inner housing and configured to be detachable from the tip tool;
A transmission mechanism housed in the inner housing and configured to transmit the rotational movement of the output shaft to the spindle and to reciprocate the spindle within a predetermined angular range around the axis. Prepared,
The spindle is disposed in a front end region defined by one end region in the longitudinal direction of the inner housing,
The motor is arranged in a rear end region defined by an end region opposite to the front end region with respect to the major axis direction. The work tool according to claim 1,
The inner housing has an intermediate region between the front end region and the rear end region,
In the outer housing, a region corresponding to the intermediate region is configured as a gripping region gripped by a user. The work tool according to claim 1 or 2,
The motor and the spindle are arranged such that an output shaft of the motor and the axis extend in parallel.
The transmission mechanism is
An intermediate shaft rotatably supported about the output shaft and another axis parallel to the axis;
A belt-shaped member that is spanned between the output shaft and the intermediate shaft of the motor, configured to transmit the rotational motion of the output shaft to the intermediate shaft, and to rotate the intermediate shaft;
A work conversion mechanism configured to transmit a rotational motion of the intermediate shaft to the spindle and to reciprocately rotate the spindle within the predetermined angular range around the axis. . The work tool according to claim 3,
The transmission mechanism is
A first wheel provided on the output shaft;
A second wheel provided on the intermediate shaft and having a diameter different from that of the first wheel;
The work tool, wherein the belt-like member is bridged between the first wheel and the second wheel. The work tool according to claim 1 or 2,
The motor and the spindle are arranged such that the output shaft of the motor and the axis intersect.
The transmission mechanism is
A connecting shaft connected to the output shaft and rotatably supported together with the output shaft;
A work conversion mechanism configured to transmit a rotational motion of the connecting shaft to the spindle and to reciprocately rotate the spindle within the predetermined angular range around the axis. . The work tool according to any one of claims 1 to 5,
A battery further;
The work tool, wherein the battery is detachably mounted on a battery mounting portion provided in the outer housing.

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