JP2017144538A - Working tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a more reasonable damping technique involving a working tool.SOLUTION: A tip tool 100 comprises: a housing 101; a brushless motor 115; a controller 180 drive-controlling the brushless motor 115; and a spindle 124 having a rotating shaft extending parallel to the output turning shaft of the brushless motor 115, and driving a blade 145 (tip tool) by being turned around the rotating shaft within a prescribed angle range. At least brushless motor 115 is disposed in a front housing region 101a, and the controller 180 is arranged in a rear housing region 101c.SELECTED DRAWING: Figure 1

Description

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

  International Publication No. 2008/128802 discloses a hand-held work tool that transmits the output of a drive motor to a spindle to drive a tip tool. In the work tool, the spindle and the output shaft portion of the motor are arranged substantially in parallel.

International Publication No. 2008/128802

  In the work tool, since the spindle and the output shaft portion of the motor are arranged in parallel, both can be arranged close to each other, so that the work tool can be reduced in size. On the other hand, in the housing of the work tool, the accommodation area of the tip tool drive mechanism including the spindle, the accommodation area of the motor, and the gripping area gripped by the user are continuously integrated.

  In the work tool, local distribution of heavy parts is likely to occur due to the proximity of relatively heavy members such as a tip tool drive mechanism and a motor. This leads to a decrease in the moment of inertia of the housing, and as a result, an increase in vibration during work is assumed.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a more rational vibration damping technique related to a work tool.

  The above problems are solved by the present invention. The work tool according to the present invention is configured as a work tool that drives a tip tool to perform a predetermined machining operation on a workpiece, and has a long housing, a brushless motor, and drive control of the brushless motor. And a rotation shaft extending in parallel with the output rotation shaft of the brushless motor, and rotated around the rotation shaft within a predetermined angle range via the brushless motor. And a spindle for driving the tip tool.

  The housing has a front housing region that defines a front region of the housing and a rear housing that defines a rear region of the housing with respect to the front and rear direction when the longitudinal extension direction of the housing is defined as the front and rear direction. And an intermediate housing region defining an intermediate portion between the front housing region and the rear housing region. At least the brushless motor is disposed in the front housing region. Regarding this arrangement, typically, in addition to the brushless motor, the spindle and the transmission drive mechanism that transmits the rotational movement of the brushless motor to the spindle to drive the spindle are also arranged in the front inner housing region. It is preferred that Moreover, both the aspect in which the whole brushless motor is accommodated in the front outer housing region and the aspect in which only a part of the brushless motor is accommodated in the front outer housing region are suitably included.

On the other hand, a controller (control device) is disposed in the rear housing region. In the present invention, since a brushless motor is employed, the controller typically includes a brushless motor drive control module (pre-assembly unit) in which a switching element, a CPU, a capacitor, and the like are arranged on a substrate. The motor drive control module can typically include various drive control circuits such as a power supply circuit, a comparison circuit, a current control circuit, a logic circuit, and a power circuit. In addition to the brushless motor drive control module, for example, a mode in which a control device for a work tool-mounted electrical component is applied, or a mode in which a control device for another electrical component is combined with a drive control module for a brushless motor is appropriately used. It can be adopted.

  In the work tool according to the present embodiment, a relatively heavy controller is disposed in the rear housing region, so that at least the front housing region in which the brushless motor is disposed is combined with the local weight of the load in the housing. By avoiding uneven distribution (concentrated arrangement of heavy objects) and distributing the heavy objects in the housing in the front-rear direction, the inertia moment of the housing is increased, thereby reducing the vibration of the housing during processing operations. Can be planned.

In the present invention, a configuration in which the rotation axis of the spindle and the rotation axis of the brushless motor are arranged in parallel is adopted. In this respect, vibration due to a decrease in the inertia moment of the housing due to the close arrangement of heavy objects. Concerns about the increase can be considered, but in this regard, a configuration is used in which a relatively heavy controller is disposed in the rear housing region to prevent a decrease in the moment of inertia of the housing and to avoid the above-mentioned concern.

  In the work tool according to the present invention, the spindle is configured to be rotated within a predetermined angular range around the rotation axis of the spindle. Such a “predetermined angle” may be fixed at all times, or may adopt a configuration in which the rotation angle is variable through a predetermined operation. The rotation of the spindle within a predetermined angle range is typically preferably set to a constant rotation cycle, but a configuration in which the rotation cycle is variable through a predetermined operation can also be employed.

  Further, the tip tool driven by a spindle that rotates around a rotation axis within a predetermined angle range can widely include tools that can perform a machining operation in such an operation mode. For example, a cutting operation, a peeling operation, a grinding operation, and the like are listed, and the tip tool can be arbitrarily replaced according to these processing operations. In addition, since an arbitrary tool is selected from a plurality of types of tip tools and attached to a single work tool according to the machining work, such a work tool can also be referred to as a “multi-tool”. .

  Furthermore, a clamp shaft can be used for attaching the tip tool to the spindle. Typically, the tip tool is clamped in such a manner that the tip tool is interposed between the clamp shaft and the spindle. In this case, the spindle is hollow along the rotation axis, and the clamp shaft is inserted through the hollow portion. The clamp shaft can be moved relative to the spindle in the direction of the rotation axis, and can be switched between the tip tool holding position and the tip tool opening position via the relative position movement. During the work, the tip tool is held at the tip tool holding position to perform the machining operation. When the tip tool is replaced, the clamp shaft is moved and placed at the tip tool release position.

  In holding and releasing the tip tool by the clamp shaft, it is preferable to employ a lock mechanism of the clamp shaft. The lock mechanism has an engagement position where the clamp shaft is locked (fixed) in a state where the clamp shaft is placed at the tip tool holding position according to a user's manual operation, and the clamp shaft is unlocked and the tip is released. It is preferable to be configured to be movable between a release position that allows tool release. With this configuration, a configuration is provided in which the end tool can be easily held and released through manual operation of the lock mechanism by the user.

As one aspect of the work tool according to the present invention, it further has an outer housing,
The housing may constitute an inner housing accommodated in the outer housing. The outer housing and the inner housing can be elastically connected to each other, and an elastic member that suppresses vibration generated in the inner housing from being transmitted to the outer housing can be provided. Typically, a mode in which a part of the outer housing is used as a handle portion used for gripping by a user is conceivable. With this configuration, the elastic member effectively suppresses vibration generated on the housing, that is, the inner housing side during processing, from being transmitted to the outer housing side used for gripping by the user. The Rukoto.

  As one aspect of the work tool according to the present invention, an intake port provided in the rear housing region, an exhaust port provided in the front housing region, and an air passage provided in the intermediate housing region are provided. In addition, a controller and a brushless motor can be disposed on a flow path from the intake port to the exhaust port via the air passage. By comprising in this way, it becomes possible to cool efficiently and rationally the controller arrange | positioned in the back housing area | region, and the brushless motor arrange | positioned in the front housing area | region. Furthermore, by providing the air inlet in the rear housing region, it is possible to reduce the risk that dust generated in the machining operation is sucked into the tool from the air inlet.

  As for air intake / exhaust in the above-described aspect, it is typically preferable to use a cooling fan driven by a brushless motor. The cooling fan is preferably attached to the output rotation shaft of the brushless motor.

  In the above aspect, an air passage is formed between the intermediate housing region and the outer housing, a cooling passage that reaches the exhaust port via the air passage is set, and a controller and a brushless motor are disposed on the cooling passage. It is also possible.

  Furthermore, the controller according to the above aspect can be disposed in the region immediately below the inflow of air sucked from the intake port inside the rear inner housing region. Typically, the controller is configured as a brushless motor drive control module including a switching element, an inverter, etc. In this case, since a considerable amount of heat is assumed, the controller directly below the inflow by the air sucked from the intake port. It can be efficiently cooled in the region.

  Moreover, in the various aspects described above, at least a part of the connection portion can be provided in the air passage for the connection portion that electrically connects the controller and the brushless motor. As the connection portion, typically, a power feeding cable or a signal transmission cable can be adopted.

It is sectional drawing which shows the vibration tool which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the structure of a main body housing. It is a perspective view which shows the structure of an inner housing and an interposed member. It is a perspective view which shows the structure of the interposition member of an inner housing. It is sectional drawing which shows the structure of an outer housing and an interposition member. It is sectional drawing which shows the structure of a front elastic member. It is sectional drawing which shows the structure of an inner housing and a drive mechanism housing. It is sectional drawing which shows the structure of an upper back elastic member. It is sectional drawing which shows the structure of the back elastic member of an upper side and a lower side. It is sectional drawing which shows the structure of a lower back elastic member. It is sectional drawing which shows the structure of a drive mechanism. It is sectional drawing which shows the structure of a to-be-driven arm. It is sectional drawing which shows the structure of a lock operation mechanism. It is sectional drawing which shows the vibration tool which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the structure of a main body housing. It is a perspective view which shows the structure of an inner housing and an interposed member. It is sectional drawing which shows the structure of an intermediate | middle elastic member and a back elastic member.

An embodiment of a work tool according to the present invention will be described with reference to FIGS. 1 to 13 are views showing the work tool according to the first embodiment, and FIGS. 14 to 17 are views showing the work tool according to the second embodiment.
In addition, in the work tool according to the second embodiment, the same name is used and the same reference numeral is used for parts and mechanisms that have substantially the same or similar functions as the parts and mechanisms of the work tool according to the first embodiment. A description thereof may be omitted.

(First embodiment)
1st Embodiment of this invention is described based on FIGS. The first embodiment of the work tool according to the present invention is an electric vibration tool 100. As shown in FIG. 1, the vibration tool 100 selectively attaches a plurality of types of tip tools such as blades and polishing pads and vibrates the tip tools according to the type of tool on the workpiece. Processing. As an example of the tip tool, a blade 145 is attached in FIG. This blade 145 is an example of the “tip tool” according to the present invention.

(Main unit housing)
As shown in FIG. 1, the vibration tool 100 includes a main body housing 101. The main body housing 101 is mainly composed of an outer housing 102 and an inner housing 104 accommodated in the outer housing 102. The outer housing 102 is an example of an “outer housing” according to the present invention, and the inner housing 104 is an example of a “housing” or an “inner housing” according to the present invention.

  As shown in FIG. 1, the main body housing 101 is provided so as to extend in a long shape in a direction intersecting with the rotation axis direction of the brushless motor 115. In the present embodiment, the longitudinal extension direction of the main body housing 101 is the front-rear direction, and the side where the blade 145 is mounted (the left side in FIG. 1) of the front-rear direction is the front side of the vibration tool 100, opposite to the front side. The side (the right side in FIG. 1) is defined as the rear side of the vibration tool 100. Further, in a vertical direction in which the rotation axis of the spindle 124 described later is extended, the side where the lock operation mechanism 150 described later is provided (upper side in FIG. 1) is the upper side of the vibration tool 100 and the side where the blade 145 is provided ( 1 is defined as the lower side of the vibration tool 100, respectively. Furthermore, a direction intersecting with both the front-rear direction and the up-down direction (paper surface normal direction in FIG. 1) is defined as a lateral direction of the vibration tool 100. The horizontal direction corresponds to the vertical direction in FIG. 2 which is a cross-sectional view taken along line II in FIG. 1, and corresponds to the horizontal direction in FIG. 6 which is a cross-sectional view taken along line III-III in FIG. . In addition, the definition of the direction is used as appropriate for the description in other drawings and configurations.

  As shown in FIG. 1, the main body housing 101 includes a front main body housing area 101a, a rear main body housing area 101c disposed on the opposite side of the front main body housing area 101a, and a front main housing area 101a and a rear main body housing area 101c. Intermediate body housing region 101b. The front main body housing area 101a is an example of the “front housing area” according to the present invention, the rear main body housing area 101c is an example of the “rear housing area” according to the present invention, and the intermediate main body housing area 101b according to the present invention. It is an example of such an “intermediate housing region”.

  As shown in FIG. 1, the outer housing 102 includes a front outer housing region 102a, a rear outer housing region 102c disposed on the opposite side of the front outer housing region 102a, and a space between the front outer housing region 102a and the rear outer housing region 102c. And an intermediate outer housing region 102b. The intermediate outer housing region 102b constitutes a grip region that is gripped by the user.

  As shown in FIG. 1, the inner housing 104 includes a front inner housing region 104a disposed in the front outer housing region 102a, an intermediate inner housing region 104b disposed in the intermediate outer housing region 102b, and a rear outer housing region 102c. And a rear inner housing region 104c.

2 is a cross-sectional view taken along the line II of FIG. As shown in FIG. 2, the intermediate outer housing region 102b has a short portion 107 that is configured to be shorter (thinner) than the front outer housing region 102a and the rear outer housing region 102c in the lateral direction.
As will be described later, the vibration tool 100 houses the brushless motor 115 in the front inner housing region 104a and houses the controller 180 in the rear inner housing region 104c. That is, since the parts having a relatively long dimension in the lateral direction are disposed in the front inner housing region 104a and the rear inner housing region 104c, the short portion 107 can be formed in the intermediate outer housing region 102b. The short portion 107 allows the user to easily grasp the intermediate outer housing region 102b (grip region).

  As shown in FIG. 1, a slide switch 108 that is operated by a user is disposed in the short portion 107. The slide switch 108 and the battery mounting unit 109 are electrically connected to the controller 180. Therefore, by operating the slide switch 108, the brushless motor 115 is switched on or off. The controller 180 is configured as a module in which a switching element for controlling a plurality of coils provided in the brushless motor 115, a central processing unit (CPU), a capacitor and the like are arranged on a substrate, and based on the operation of the slide switch 108. Drive control of the brushless motor 115 is performed. The controller 180 includes various drive control circuits such as a power supply circuit, a comparison circuit, a current control circuit, a logic circuit, and a power circuit. The brushless motor 115 is an example of the “brushless motor” according to the present invention, and the controller 180 is an example of the “controller” according to the present invention.

2, FIG. 3, FIG. 4, FIG. 5 and FIG. 6 each show a part of the structure related to the main body housing 101. FIG. 3 and 4 are perspective views showing the structures of the inner housing 104 and the interposition member 103, FIG. 5 is a sectional view taken along the line II-II in FIG. 2, and FIG. 6 is a sectional view taken along the line III-III in FIG.
As shown in FIGS. 1, 5, and 6, the outer housing 102 is mainly composed of a first outer housing 102A disposed on the upper side and a second outer housing 102B disposed on the lower side. The first outer housing 102A and the second outer housing 102B are each made of synthetic resin.
2, 3, 4, 5, and 6 show an interposition member 103 that is integrated with the outer housing 102. In particular, the overall configuration of the interposition member 103 is shown in FIGS. The interposition member 103 is made of synthetic resin.

  As shown in FIGS. 2, 5, and 6, two interposition members 103 are provided apart in the lateral direction. As shown in FIG. 5, the interposition member 103 is integrated with the first outer housing 102A and the second outer housing 102B by the fixing member 103d. The fixing member 103d is constituted by a screw. As shown in FIGS. 3 and 4, the interposition member 103 is disposed between the front interposition member region 103a and the rear interposition member region 103c extending in the vertical direction, and between the front interposition member region 103a and the rear interposition member region 103c. Intermediate intermediate member region 103b. As shown in FIG. 6, a plurality of convex portions 103a1 projecting inward are formed in the front interposing member region 103a.

  As shown in FIGS. 3 and 4, the inner housing 104 integrates the drive mechanism housing 105, the first inner housing 104A, the second inner housing 104B, the third inner housing 104C, and the fourth inner housing 104D. It is constituted by. The drive mechanism housing 105 is made of metal, and the first inner housing 104A, the second inner housing 104B, the third inner housing 104C, and the fourth inner housing 104D are each made of synthetic resin. As shown in FIG. 1, the drive mechanism housing 105 accommodates the drive mechanism 120 that drives the blade 145 by the output of the brushless motor 115.

  7 is a cross-sectional view taken along line IV-IV in FIG. As shown in FIG. 7, the first inner housing 104A and the second inner housing 104B house the brushless motor 115 and are integrated with the drive mechanism housing 105 by a fixing member 104d. The fixing member 104d is configured by a screw. The front inner housing region 104a is mainly composed of a drive mechanism housing 105, a first inner housing 104A, and a second inner housing 104B.

As shown in FIG. 1, the intermediate inner housing region 104b and the rear inner housing region 104c are formed in a hollow shape. For this reason, a space is formed inside the intermediate inner housing region 104b. This space portion is an example of the “space portion” according to the present invention. As shown in FIGS. 2, 3 and 4, the intermediate inner housing region 104b and the rear inner housing region 104c are mainly composed of a third inner housing 104C and a fourth inner housing 104D. The third inner housing 104C and the fourth inner housing 104D are arranged adjacent to each other in the lateral direction, and are integrated by a fixing member 104f. The fixing member 104f is configured by a screw.
The third inner housing 104C and the drive mechanism housing 105 are integrated by the fixing member 104e shown in FIGS. The fixing member 104e is constituted by a screw. Further, as shown in FIG. 1, the rear end portion of the second inner housing 104B and the front end portions of the third inner housing 104C and the fourth inner housing 104D are brought into contact with each other. With this configuration, the drive mechanism housing 105, the first inner housing 104A, the second inner housing 104B, the third inner housing 104C, and the fourth inner housing 104D are integrated.

  As shown in FIGS. 1 and 2, a diameter-enlarged region is formed behind the third inner housing 104C and the fourth inner housing 104D. The enlarged diameter region constitutes the rear inner housing region 104c. A controller 180 is disposed in the rear inner housing region 104c, and a battery mounting portion 109 for mounting the battery 190 is provided. Battery mounting portion 109 is provided with a power receiving terminal that is electrically connected to a power feeding terminal of battery 190. The battery mounting unit 109 is configured to be detachable by sliding the battery 190 up and down. As shown in FIG. 1, the controller 180 is configured to extend in the sliding movement direction (vertical direction) when the battery 190 is mounted on the battery mounting portion 109. With this configuration, the rear main body housing region 101c in the front-rear direction can be shortened.

As shown in FIGS. 2, 3 and 4, the rear inner housing region 104c is provided with an intake port 104c1. The intake port 104c1 is provided in both the third inner housing 104C and the fourth inner housing 104D. As shown in FIGS. 3 and 4, the second inner housing 104B is provided with an exhaust port 104a1. Further, the internal space (space part) of the intermediate inner housing region 104b constitutes an air passage 119 that connects the intake port 104c1 and the exhaust port 104a1. With this configuration, the air that has been flown by the rotational drive of the cooling fan 118 (see FIG. 1) attached to the output shaft portion 115a of the brushless motor 115 is sucked from the intake port 104c1 and exhausted through the air passage 119. By discharging from 104a1, a series of cooling air flow paths is established, and the controller 180 and the brushless motor 115 can be efficiently cooled. In this cooling air flow path, the controller 180 is provided in a region immediately below the inflow of air sucked from the intake port 104c1, thereby improving the cooling efficiency. The intake port 104c1 is an example of the “intake port” according to the present invention, the exhaust port 104a1 is an example of the “exhaust port” according to the present invention, and the cooling fan 118 is an example of the “cooling fan” according to the present invention. The air passage 119 is an example of the “air passage” according to the present invention.
As shown in FIG. 1, a gap is formed between the rear outer housing region 102c and the rear inner housing region 104c, and the gap constitutes the main body inlet 101d. As a result, the air that has flowed due to the rotation of the cooling fan 118 can be guided from the main body intake port 101d to the intake port 104c1.

  The air passage 119 is provided with a connecting portion (not shown) that electrically connects the brushless motor 115 and the controller 180. The said connection part is comprised by the electric power feeding cable and a signal transmission cable. By arranging the connection portion in the air passage 119, the internal space of the main body housing 101 can be used efficiently. This connection portion is an example of the “connection portion” according to the present invention.

(Elastic member)
The outer housing 102 and the inner housing 104 are connected by an elastic member. Thereby, it is possible to suppress the vibration of the inner housing 104 from being transmitted to the outer housing 102. This elastic member is an example of the “elastic member” according to the present invention. The elastic member includes a front elastic member 110a, an intermediate elastic member 110b, and a rear elastic member 110c.

  As shown in FIG. 6, four front elastic members 110 a are arranged between the convex portion 103 a 1 of the front interposed member region 103 a and the drive mechanism housing 105. The four front elastic members 110a constitute an upper and lower arrangement group arranged to be spaced apart in the vertical direction and a horizontal direction group arranged to be separated from each other in the horizontal direction. As described above, since the drive mechanism housing 105 constitutes the inner housing 104 and the interposition member 103 is integrated with the outer housing 102, the front outer housing region 102a and the front inner housing region 104a are connected by the front elastic member 110a. Is done. The front elastic member 110a is constituted by a rubber elastic element, and is disposed so as to cover the convex portion 103a1. Further, the drive mechanism housing 105 has a concave portion in which the convex portion 103a1 including the front elastic member 110a is disposed. With this configuration, the front elastic member 110a is interposed in the front-rear direction, the vertical direction, and the lateral direction in the front inner housing region 104a and the front outer housing region 102a. For this reason, it can suppress effectively that the vibration which generate | occur | produces in the front inner housing area | region 104a is transmitted to the front outer housing area | region 102a about all directions.

  As shown in FIGS. 3, 4, 8, and 9, four rear elastic members 110c are disposed between the rear inner housing region 104c and the rear outer housing region 102c. 8 is a sectional view taken along line VV in FIG. 1, and FIG. 9 is a sectional view taken along line VI-VI in FIG. The four rear elastic members 110c constitute an upper and lower arrangement group arranged to be spaced apart in the vertical direction and a horizontal direction group arranged to be separated from each other in the horizontal direction. The rear elastic member 110c is composed of a rubber elastic element.

As shown in FIGS. 3, 8, and 9, the upper rear elastic member 110 c in the vertical arrangement group is disposed in a space between the rear inner housing region 104 c and the rear outer housing region 102 c. As a configuration for defining a part of the space, a convex portion 102c1 is formed in the rear outer housing region 102c. The upper rear elastic member 110c is configured to extend in the front-rear direction, the up-down direction, and the lateral direction.
Further, as shown in FIGS. 4, 9, and 10, the lower rear elastic member 110c in the upper and lower arrangement group is disposed in a space between the rear inner housing region 104c and the rear outer housing region 102c. As a configuration for defining a part of the space, a convex portion 102c2 is formed in the rear outer housing region 102c. The lower rear elastic member 110c is configured to extend in the front-rear direction, the up-down direction, and the lateral direction.
With this configuration, the rear elastic member 110c is interposed in the front-rear direction, the vertical direction, and the lateral direction in the rear inner housing region 104c and the rear outer housing region 102c. For this reason, it can suppress effectively that the vibration which generate | occur | produces in the back inner housing area | region 104c is transmitted to the back outer housing area | region 102c about all directions.

  As another configuration, the rear elastic member 110c may be disposed between the boundary between the rear inner housing region 104c and the intermediate inner housing region 104b and between the rear outer housing region 102c and the intermediate outer housing region 102b. Further, the rear elastic member 110c can be disposed between the intermediate inner housing region 104b and the intermediate outer housing region 102b.

  The intermediate inner housing region 104b shown in FIGS. 2, 3, and 4 is configured to have elasticity by a flexible synthetic resin. For this reason, the intermediate inner housing region 104b constitutes an intermediate elastic member 110b. The intermediate elastic member 110b extends in the front-rear direction and can be deformed around the extending axis. For this reason, it is possible to effectively suppress the vibration generated in the front inner housing region 104a from being transmitted to the rear inner housing region 104c.

(Drive mechanism)
The configuration of the drive mechanism 120 will be described with reference to FIGS. 1, 11, 12 and 13. 11 is an enlarged sectional view showing the drive mechanism 120, FIG. 12 is a sectional view taken along line VIII-VIII in FIG. 1, and FIG. 13 is a sectional view taken along line IX-IX in FIG.
As shown in FIG. 1 and FIG. 11, the drive mechanism 120 is composed mainly of an eccentric shaft 121, a drive bearing 122, a driven arm 123, and a spindle 124. The spindle 124 is an example of the “spindle” according to the present invention. The spindle 124 has a cylindrical shape, and a clamp shaft 127 is detachably disposed in the spindle 124. The vibration tool 100 includes a lock mechanism 130 that locks and unlocks the clamp shaft 127 with respect to the vibration tool 100, and a lock operation mechanism 150 that allows a user to manually operate the lock mechanism 130.

  As shown in FIG. 11, the drive mechanism housing 105 includes a first drive mechanism housing 105A and a second drive mechanism housing 105B, and the drive mechanism housing 105A is driven between the first drive mechanism housing 105A and the second drive mechanism housing 105B. A mechanism 120, a lock mechanism 130, and a lock operation mechanism 150 are arranged. The first drive mechanism housing 105A and the second drive mechanism housing 105B are integrated by a fixing member 105a. The fixing member 105a is constituted by a screw.

  As shown in FIG. 11, the rotation axis direction of the spindle 124 is parallel to the output shaft portion 115 a of the brushless motor 115. The eccentric shaft 121 attached to the tip of the output shaft 115a is rotatably supported by an upper bearing 121b and a lower bearing 121c. The bearings 121b and 121c are held by the drive mechanism housing 105.

  As shown in FIGS. 11 and 12, the driven arm 123 includes a predetermined region of the spindle 124 and an arm portion 123 a configured to contact the outer peripheral portion of the drive bearing 122 attached to the eccentric portion 121 a of the eccentric shaft portion 121. And a fixing portion 123b that surrounds and is fixed to the spindle 124. The driven arm 123 and the spindle 124 are disposed below the brushless motor 115. With this configuration, the spindle 124 can be shortened in the vertical direction. In addition, this configuration makes it possible to bring the blade 145 and the driven arm 123 closer in the vertical direction. Therefore, the couple generated according to the distance between the driven arm 123 and the blade 145 is reduced. Thereby, the vibration which arises by the effect | action of the blade 145 with respect to a workpiece at the time of a process operation is suppressed.

  As shown in FIG. 11, the spindle 124 has a flange-like tool holding portion 126 for holding the blade 145 together with the clamp shaft 127. The spindle 124 is rotatably supported by an upper bearing 124a and a lower bearing 124b.

  The clamp shaft 127 shown in FIG. 11 is a substantially cylindrical member that can be inserted into the spindle 124. An engagement groove 127a is provided on the upper side of the clamp shaft 127, and a flange-like clamp head 127b is provided on the lower side. When the clamp shaft 127 is inserted into the spindle 124, the engagement groove portion 127a is held by the lock mechanism 130, and the blade 145 is held between the clamp head 127b and the tool holding portion 126.

  When the brushless motor 115 is driven, the eccentric part 121a of the eccentric shaft part 121 and the drive bearing 122 rotate around the motor rotation axis direction by the rotation of the output shaft part 115a. As a result, the driven arm 123 is reciprocally driven in an arc shape around the rotation axis of the spindle 124. As a result, the blade 145 sandwiched between the spindle 124 and the clamp shaft 127 is reciprocated in an arc shape so that a predetermined processing operation (for example, cutting) can be performed.

(Lock mechanism)
A lock mechanism 130 shown in FIG. 11 is a mechanism for holding the clamp shaft 127.
As shown in FIG. 11, the lock mechanism 130 is mainly composed of a clamp member 131, a collar member 135, a first coil spring 134, a lid member 137, and a bearing 135b, and these components constitute a lock mechanism assembly. The lock mechanism 130 includes an urging mechanism 140 that urges the clamp shaft 127 from the lower side to the upper side. The urging mechanism 140 is mainly composed of a support member 141 and a second coil spring 142.

  As shown in FIG. 11, the support member 141 is a hollow, substantially cylindrical member that passes through the clamp shaft 127 and is rotatably supported by a bearing 124a. The bearing 124 a is configured to support both the spindle 124 and the support member 141. With this configuration, it is possible to reduce the number of parts of the bearing and reduce the length in the vertical direction. The second coil spring 142 is inserted through the support member 141. The lower side of the support member 141 is formed in a flange shape so that the lower end of the second coil spring 142 is brought into contact therewith. Further, the upper end portion of the support member 141 is configured to support the clamp member 131 in a state where the clamp member 131 is placed at a position (release position) when the blade 145 is replaced.

  As shown in FIG. 11, the lock mechanism 130 is disposed between the upper end portion of the support member 141 and the first drive mechanism housing 105 </ b> A in the rotation axis direction of the spindle 124. Since the lock mechanism 130 and the spindle 124 have independent configurations and are spaced apart from each other, the design of the lock mechanism 130 can be performed without depending on the spindle 124.

  As shown in FIG. 11, the clamp member 131 is composed of a pair of members that sandwich the engagement groove portion 127 a of the clamp shaft 127 in the radial direction of the clamp shaft 127. Each clamp member 131 is configured to be movable in the radial direction of the clamp shaft 127. Furthermore, a plurality of convex portions that can be engaged with the engaging groove portion 127 a are formed in the inner surface region of the clamp member 131 that faces the clamp shaft 127. Furthermore, the clamp member 131 has a clamp member inclined portion 131a that is inclined with respect to the vertical direction. As shown in FIG. 11, the clamp member inclined portions 131a are provided in two places.

As shown in FIG. 11, a first coil spring 134 is disposed between each clamp member 131 between the clamp member 131 and the lid member 137. The first coil spring 134 stabilizes the posture of the clamp member 131 by urging the clamp member 131 downward.
A collar member 135 shown in FIG. 11 is a member for controlling the clamping state of the clamp shaft 127 by the clamp member 131. The collar member 135 has a hole portion through which the clamp shaft 131 is inserted and the clamp shaft 127 is inserted. A bearing 135b for rotatably supporting the collar member 135 is disposed in the outer region of the collar member 135. The bearing 135b is configured to be slidable with respect to the second drive mechanism housing 105B.
With this configuration, the lock mechanism assembly is movable in the direction of the rotation axis of the spindle 124. The collar member 135 has a collar member inclined portion 135 a that is inclined with respect to the rotation axis direction of the spindle 124. Since the collar member inclined portion 135a and the clamp member inclined portion 131a are configured to be in sliding contact with each other, the collar member inclined portion 135a is provided at two locations corresponding to the clamp member inclined portion 131a.

  As shown in FIG. 11, the collar member 135 is urged by the second coil spring 142, the clamp member 131 is urged by the first coil spring 134, and the collar member inclined portion 135a contacts the clamp member inclined portion 131a. Touch. As a result, the clamp member 131 is moved toward the radially inner side of the clamp shaft 127. As a result, the two clamp members 131 clamp the clamp shaft 127 in a state where the convex portion of the clamp member 131 and the engagement groove portion 127a of the clamp shaft 127 are engaged. The clamp shaft 127 is biased upward by the second coil spring 142 while being clamped by the clamp member 131. As a result, the blade 145 is sandwiched between the clamp head 127 b of the clamp shaft 127 and the tool holding portion 126 of the spindle 124.

(Lock operation mechanism)
The lock operation mechanism 150 shown in FIGS. 11 and 13 is configured to operate the lock mechanism 130. More specifically, the lock operation mechanism 150 is configured to move the collar member 135 in the vertical direction. By moving the collar member 135 in the vertical direction, the engagement and release of the clamp member 131 and the clamp shaft 127 are switched.

  As shown in FIGS. 11 and 13, the lock operation mechanism 150 is mainly configured by a handle portion 151 operated by a user and a rotation shaft portion 151 a interlocked with the handle portion 151. As shown in FIG. 13, the rotation shaft portion 151 a is disposed so as to penetrate the drive mechanism housing 105 between the lid member 137 and the first drive mechanism housing 105 </ b> A. A pair of cam portions 151b configured to be able to come into contact with the collar member 135 are provided at both ends of the rotation shaft portion 151a. An eccentric shaft portion 151c is provided between the pair of cam portions 151b.

11 and 13 show a state in which the blade 145 is attached to the vibration tool 100. In this state, the cam portion 151 b is configured not to contact the collar member 135. Since the collar member 135 in this state is biased upward by the second coil spring 142, the collar member inclined portion 135a and the clamp member inclined portion 131a abut. As a result, the clamp member 131 is moved toward the clamp shaft 127, and the clamp shaft 127 is held between the two clamp members 131. Further, the eccentric shaft portion 151c is placed at a position separated from the first drive mechanism housing 105A. The upper end portion of the support member 141 is not in contact with the clamp member 131.
As described above, the position of the clamp shaft 127 in this state defines the holding position for holding the blade 145, the position of the clamp member 131 defines the engagement position for engaging with the clamp shaft 127, and the position of the collar member 135 is A maintenance position for maintaining the clamp member 131 in the engagement position is defined.

  On the other hand, when removing the blade 145, the rotation shaft 151a is rotated by the user rotating the handle 151. In the rotating state of the handle portion 151, the cam portion 151 b contacts the collar member 135 and moves the collar member 135 downward against the urging force of the second coil spring 142. As a result, the upper end portion of the support member 141 contacts the clamp member 131, and the clamp member 131 is moved relative to the collar member 135.

When the clamp member 131 is moved upward relative to the collar member 135, the contact between the clamp member inclined portion 131a and the collar member inclined portion 135a is released, and the clamp member 131 is separated from the clamp shaft 127. It becomes possible to move to. That is, the clamping force of the clamp shaft 127 by the clamp member 131 is reduced. In this state, the clamp shaft 127 is removed from the spindle 124 by pulling the clamp shaft 127 downward. When the clamping shaft 127 is released, the blade 145 is released. Thereby, the blade 145 as the tip tool can be replaced.
The position of the collar member 135 in this state defines an allowable position that allows the clamp member 131 to move to the release position, and the position of the clamp member 131 defines a release position that releases the engagement with the clamp shaft 127. The position of the shaft 127 defines an open position where the blade 145 is opened.
The eccentric shaft portion 151c is placed at a position where it comes into contact with the first drive mechanism housing 105A.

(Operation related to machining work)
Next, based on FIG.1, FIG2 and FIG. 11, operation | movement of the vibration tool 100 in the case of processing is demonstrated. The user holds the short portion 107 of the intermediate outer housing region 102b and switches the slide switch 108 on. As a result, the controller 180 rotates the brushless motor 115 to rotate the drive bearing 122 together with the eccentric shaft 121. As a result, the drive bearing 122 drives the driven arm 123, so that the blade 145 and the spindle 124 reciprocate around the rotation shaft portion. In this state, the user can perform a machining operation by bringing the blade 145 into contact with the workpiece.

In the machining operation, the controller 180 is disposed in the rear inner housing region 104c, and the battery 190 is mounted. As a result, the moment of inertia of the inner housing 104 is increased, so that the vibration of the inner housing 104 can be reduced. Furthermore, a phenomenon in which the power feeding terminal of the battery 190 and the power receiving terminal of the battery mounting unit 109 repeatedly contact and non-contact in a short time to cause a malfunction, or a phenomenon in which the power feeding terminal and the power receiving terminal are welded as the phenomenon progresses. Can be prevented.
Further, the front elastic member 110a connects the front inner housing region 104a and the front outer housing region 102a, the intermediate elastic member 110b connects the front inner housing region 104a and the rear inner housing region 104c, and the rear elastic member 110c is rearward. Since the inner housing region 104c and the rear outer housing region 102c are connected, it is possible to suppress the vibration generated in the front inner housing region 104a from being transmitted to the outer housing 102.
Therefore, the user can perform a machining operation with the vibration tool 100 in a state where vibration suppression is achieved.

  In addition, the cooling fan 118 is driven to rotate as the brushless motor 115 rotates. Along with this, air flowing in from the main body intake port 101d is taken into the inner housing 104 from the intake port 104c1 and discharged from the exhaust port 104a1 through the air passage 119. As the air moves, the controller 180 and the brushless motor 115 arranged immediately below the intake port 104c1 are cooled.

(Second Embodiment)
A vibration tool 200 according to a second embodiment of the present invention will be described with reference to FIGS. The vibration tool 200 according to the second embodiment differs from the vibration tool 100 according to the first embodiment in the configurations of the inner housing 104 and the intermediate elastic member.

(Inner housing)
As shown in FIGS. 14, 15 and 16, the inner housing 104 of the vibration tool 200 includes a drive mechanism housing 105, a first inner housing 104A, a second inner housing 104B, a fifth inner housing 104E, and a sixth inner. And a housing 104F. 15 is a cross-sectional view taken along the line XX of FIG. 14, and FIG. 16 is a cross-sectional view taken along the line XI-XI of FIG.
The first inner housing 104A, the second inner housing 104B, the fifth inner housing 104E, and the sixth inner housing 104F are each made of synthetic resin. The intermediate inner housing region 104b is mainly composed of the fifth inner housing 104E, and the rear inner housing region 104c is mainly composed of the sixth inner housing 104F.

The fifth inner housing 104E and the drive mechanism housing 105 are integrated by the fixing member 104e shown in FIG. Further, the rear end portion of the second inner housing 104B and the front end portion of the fifth inner housing 104E are brought into contact with each other. With this configuration, the drive mechanism housing 105, the first inner housing 104A, the second inner housing 104B, and the fifth inner housing 104E are integrated.
As shown in FIGS. 14 and 15, a diameter-enlarged region is formed behind the sixth inner housing 104F. A controller 180 is disposed in the enlarged diameter region, and a battery mounting portion 109 is provided.

As shown in FIG. 16, an intake port 104c1 is provided in the rear inner housing region 104c. Further, an exhaust port 104a1 is provided in the front inner housing region 104a. As shown in FIG. 14, the space between the intermediate outer housing region 102b and the intermediate inner housing region 104b constitutes an air passage 119. As shown in FIGS. 14 and 15, a main body inlet 101d is formed between the rear outer housing region 102c and the rear inner housing region 104c.
With this configuration, the air that has flowed due to the rotation drive of the cooling fan 118 is taken in from the main body intake port 101d and is discharged from the exhaust port 104a1 via the intake port 104c1, the controller 180, the air passage 119, and the brushless motor 115. Thereby, the controller 180 and the brushless motor 115 are efficiently cooled. In the air passage 119, a connection portion for electrically connecting the brushless motor 115 and the controller 180 is disposed.

(Elastic member)
Similar to the vibration tool 100 described above, in the vibration tool 200, the front inner housing region 104a and the front outer housing region 102a are connected by a front elastic member 110a. In addition, as shown in FIG. 17, the sixth inner housing 104F and the rear outer housing region 102c are connected by a rear elastic member 110c.

  As shown in FIGS. 14, 15 and 17, an intermediate elastic member 110d made of a rubber elastic element is disposed between the fifth inner housing 104E and the sixth inner housing 104F. The intermediate elastic member 110d is configured by providing two rubber elastic elements configured in a cylindrical shape. As shown in FIG. 14, a cylindrical elastic member arrangement in which the rear end portion of the fifth inner housing 104E is inserted into the intermediate elastic member 110d and the outer side of the intermediate elastic member 110d is configured in the sixth inner housing 104F. It abuts on the part. With this configuration, the intermediate elastic member 110d is in close contact with both the fifth inner housing 104E and the sixth inner housing 104F, and integrates the fifth inner housing 104E and the sixth inner housing 104F. The intermediate elastic member 110d can effectively suppress the vibration generated in the front inner housing region 104a from being transmitted to the rear inner housing region 104c in all directions.

(Operation related to machining work)
As with the vibration tool 100, the vibration tool 200 can reciprocate the blade 145 by the brushless motor 115 and the drive mechanism 120 shown in FIG.
In the processing operation, the front elastic member 110a connects the front inner housing region 104a and the front outer housing region 102a, the intermediate elastic member 110d connects the front inner housing region 104a and the rear inner housing region 104c, and the rear elastic member. Since 110 c connects the rear inner housing region 104 c and the rear outer housing region 102 c, vibration generated in the front inner housing region 104 a can be suppressed from being transmitted to the outer housing 102.
Therefore, the user can perform a machining operation with the vibration tool 200 in a state where vibration suppression is achieved.

  In addition, the cooling fan 118 is driven to rotate as the brushless motor 115 rotates. As a result, the air flowing in from the main body intake port 101d moves through the intake port 104c1, the air passage 119, and the exhaust port 104a1, whereby the controller 180 and the brushless motor 115 are cooled.

  In the above, although demonstrated using the vibration tools 100 and 200, a work tool is not restricted to an electric vibration tool. For example, the present invention may be applied to a work tool in which a tip tool rotates, such as a grinder or a circular saw, as the work tool. Moreover, the front elastic member 110a, the intermediate | middle elastic member 110b (110d), and the back elastic member 110c can be set by arbitrary numbers.

  In the present embodiment, the brushless motor 115 that drives the battery 190 as a power source is illustrated, but the vibration tools 100 and 200 can be configured to use an external power source instead of the battery 190. Specifically, a power cable that can be connected to an external power source and that is electrically connected to the controller 180 can be connected to the rear outer housing region 102c. When the brushless motor 115 is a direct current motor, the controller 180 can 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, an AC motor may be employed as the brushless motor 115. In this case, the controller 180 does not need to have a function as a converter.

In view of the gist of the present invention, the following modes can be configured for the work tool according to the present invention. Each aspect is used not only alone or in combination with each other, but also in combination with the invention described in the claims.
(Aspect 1)
A main body inlet is formed between the rear end portion of the outer housing and the rear end portion of the housing (that is, the inner housing).
(Aspect 2)
Further, when the extending direction of the rotation axis of the spindle is defined as the vertical direction, and the direction intersecting the front-rear direction and the vertical direction is defined as the horizontal direction, the front elastic member is formed by a plurality of elastic elements spaced apart in the horizontal direction. Composed.
(Aspect 3)
The rear elastic member is composed of a plurality of elastic elements that are spaced apart in the vertical direction.

(Correspondence between each component of this embodiment and each component of the present invention)
The correspondence between each component of the present embodiment and each component of the present invention is shown as follows. In addition, this embodiment shows an example of the form for implementing this invention, and this invention is not limited to the structure of this embodiment.
The vibration tool 100 or the vibration tool 200 is an example of the “work tool” according to the present invention. The blade 145 is an example of the “tip tool” according to the present invention. The outer housing 102 is an example embodiment that corresponds to the “outer housing” according to the present invention. The inner housing 104 is an example of a “housing” or “inner housing” according to the present invention. The front body housing regions 101a and 104a are examples of the “front housing region” according to the present invention. The rear body housing regions 101c and 104c are examples of the “rear housing region” according to the present invention. The intermediate body housing regions 101b and 104b are examples of the “intermediate housing region” according to the present invention. The brushless motor 115 is an example of the “brushless motor” according to the present invention. The controller 180 is an example of the “controller” according to the present invention. The intake port 104c1 is an example embodiment that corresponds to the “intake port” according to the present invention. The exhaust port 104a1 is an example embodiment that corresponds to the “exhaust port” according to the present invention. The cooling fan 118 is an example of the “cooling fan” according to the present invention. The air passage 119 is an example of the “air passage” according to the present invention. The spindle 124 is an example of the “spindle” according to the present invention.

100, 200 Vibration tool (work tool)
101 Main body housing 101a Front main body housing area 101b Middle main body housing area 101c Rear main body housing area 101d Main body inlet 102 Outer housing 102A First outer housing 102B Second outer housing 102a Front outer housing area 102b Middle outer housing area 102c Rear outer housing area 102c1 Convex part 102c2 Convex part 102d Fixing member 103 Interposing member 103a Front interposing member area 103a1 Protruding part 103b Intermediate interposing member area 103c Rear interposing member area 103d Fixing member 104 Inner housing 104A First inner housing 104A1 Opening 104B Second inner housing 104C First 3 inner housing 104D 4th inner housing 104E 5th inner housing 104F 1st 6 Inner housing 104a Front inner housing region 104a1 Exhaust port 104b Intermediate inner housing region 104c Rear inner housing region 104c1 Inlet port 104d Fixed member 104e Fixed member 104f Fixed member 105 Drive mechanism housing 105A First drive mechanism housing 105B Second drive mechanism housing 105a Fixed member 107 Short portion 108 Slide switch 109 Battery mounting portion 110a Front elastic member 110b Intermediate elastic member 110c Rear elastic member 110d Intermediate elastic member 115 Brushless motor 115a Output shaft 118 Cooling fan 119 Air passage 120 Drive mechanism 121 Eccentric shaft 121a Eccentric Part 121b bearing 121c bearing 122 drive bearing 123 driven arm 123a arm part 123b fixed part 1 4 spindle 124a bearing 124b bearing 126 tool holder 127 clamp shaft (tool holder)
127a Engaging groove portion 127b Clamp head 130 Lock mechanism 131 Clamp member 131a Clamp member inclined portion 134 First coil spring 135 Color member 135a Color member inclined portion 135b Bearing 137 Lid member 140 Energizing mechanism 141 Support member 141a Coil spring support portion 141b Clamp Member support part 142 Second coil spring 145 Blade (tip tool)
150 Lock operation mechanism 151 Handle portion 151a Rotating shaft portion 151b Cam portion 151c Eccentric shaft portion 180 Controller 190 Battery

Claims (6)

A work tool that drives a tip tool to perform a predetermined machining operation on a workpiece,
A housing formed in an elongated shape;
A brushless motor,
A controller for controlling the driving of the brushless motor;
The tip tool has a turning shaft extending in parallel with the output turning shaft of the brushless motor, and is turned around the turning shaft within a predetermined angular range via the brushless motor. A spindle for driving,
The housing has a front housing region that defines a front region of the housing and a rear housing region that defines a rear region of the housing with respect to the front and rear direction when the longitudinal extension direction of the housing is defined as the front and rear direction. And an intermediate housing region defining an intermediate portion between the front housing region and the rear housing region,
At least the brushless motor is disposed in the front housing region,
The work tool, wherein the controller is disposed in the rear housing region. The work tool according to claim 1,
And an outer housing,
The housing constitutes an inner housing accommodated in the outer housing,
The work tool further comprising an elastic member that elastically connects the outer housing and the inner housing and suppresses vibration generated in the inner housing from being transmitted to the outer housing. The work tool according to claim 1 or 2,
An intake port provided in the rear housing region, an exhaust port provided in the front housing region, and an air passage provided in the intermediate housing region;
A work tool, wherein the controller and the brushless motor are arranged on a flow path from the intake port to the exhaust port via the air passage. A work tool according to claim 2,
An intake port provided in the rear housing region, an exhaust port provided in the front housing region, and an air passage formed between the intermediate housing region and the outer housing;
A work tool, wherein the controller and the brushless motor are arranged on a flow path from the intake port to the exhaust port via the air passage. The work tool according to claim 3 or 4,
The work tool, wherein the controller is disposed in a region immediately below the inflow of air sucked from the air intake port in the rear inner housing region. The work tool according to any one of claims 3 to 5,
A work tool having a connection part for electrically connecting the controller and the brushless motor, wherein at least a part of the connection part is provided in the air passage.

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