JP2019005848A - Power tool - Google Patents

Abstract

To provide a power tool which enables reduction of vibration transmitted from a body part to a handle part to further improve workability.SOLUTION: A power tool includes: a body part 2 having a body housing 5, a motor 6 supported by the body housing 5, and a drive mechanism 10 driven by rotational force of the motor 6; a holding part 31 which is located at a spacing from the body part 2; and a vibration reduction part 4 which is provided between the body part 2 and the holding part 31, connects the body part 2 with the holding part 31, and reduces vibration transmitted from the body part 2 to the holding part 31. The vibration reduction part 4 has: a first vibration reduction mechanism 42 connected to the body part 2; and a second vibration reduction mechanism 43 provided between the first vibration reduction mechanism 42 and the holding part 31.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power tool.

  2. Description of the Related Art Conventionally, there has been provided a power tool that includes a main body portion on which a tip tool can be mounted and a handle portion connected to the main body portion, and crushes a workpiece by applying a striking force (or rotational force and striking force) to the tip tool. Widely known. In such a power tool, a large vibration is generated in the main body during the crushing operation, and the vibration is transmitted from the main body to the operator gripping the handle, so that the worker is easily fatigued and the workability is reduced. There was a problem that.

  In order to solve the above problem, the power tool described in Patent Document 1 is provided with a vibration reduction mechanism between the main body portion and the handle portion to reduce vibration transmitted from the main body portion to the handle portion.

JP 2017-013173 A

  The power tool described in Patent Document 1 is configured such that only one vibration reduction mechanism is interposed on a transmission path of vibration transmitted from the main body to the handle, and reduction of vibration transmitted from the main body to the handle is realized. It was. However, there has been a demand for a power tool that further reduces the vibration transmitted from the main body to the handle and further improves workability.

  Then, an object of this invention is to provide the power tool which reduced the vibration transmitted from a main-body part to a handle | steering-wheel part, and improved workability | operativity more.

  In order to solve the above-described problems, the present invention provides a main body having a main body housing, a motor supported by the main body housing, a drive unit supported by the main body housing and driven by the rotational force of the motor, and the main body Reduced vibration transmitted from the main body part to the gripping part by connecting the main body part and the gripping part and being provided between the gripping part that is spaced apart from the part and the main body part and the gripping part A vibration reducing portion that includes a first vibration reducing mechanism connected to the main body portion, and a second vibration reducing portion provided between the first vibration reducing mechanism and the grip portion. And a power tool characterized by having a mechanism.

  According to the power tool having the above configuration, the first vibration reduction mechanism and the second vibration reduction mechanism are interposed on the transmission path of the vibration generated in the main body portion and transmitted from the main body portion to the gripping portion. For this reason, it is possible to further reduce the vibration transmitted from the main body portion to the gripping portion and to improve the workability as compared with the configuration in which only one vibration reduction mechanism is interposed on the vibration transmission path. be able to.

  In the above configuration, it is preferable to further include a reciprocating motion conversion mechanism that converts the rotational force of the motor into a reciprocating motion and drives the driving unit to reciprocate in the first direction.

  The vibration reduction unit further includes an intermediate connection portion connected to the main body portion via the first vibration reduction mechanism and connected to the second vibration reduction mechanism. It is preferable that the body portion and the grip portion can be moved relative to each other in the first direction.

  According to such a configuration, the direction in which the drive unit reciprocates and the direction in which the intermediate connection unit can move relative to the main body unit and the grip unit by the first vibration reduction mechanism and the second vibration reduction mechanism are the same. I'm doing it. For this reason, the vibration which arises in a main-body part by a drive part can be effectively reduced with the 1st vibration reduction mechanism and the 2nd vibration reduction mechanism. In addition, the direction in which the intermediate connection portion is relatively movable with respect to the main body portion by the first vibration reduction mechanism coincides with the direction in which the intermediate connection portion is relatively movable with respect to the grip portion by the second vibration reduction mechanism. ing. For this reason, the vibration which arises in a main-body part by a drive part can be effectively reduced by the combination of a 1st vibration reduction mechanism and a 2nd vibration reduction mechanism.

  The grip portion may extend in a second direction orthogonal to the first direction, and the vibration reduction portion may include two first vibration reduction mechanisms that are spaced apart from each other in the second direction. preferable.

  According to such a configuration, the first vibration reduction mechanism is provided at a position spaced apart in the longitudinal direction of the grip portion. For this reason, when the intermediate connection portion moves relative to the main body portion, the longitudinal direction of the gripping portion is difficult to tilt, and it is possible to suppress the balance of the gripping portion from being lost and the workability from being impaired.

  Further, the intermediate connection portion includes one end portion in the second direction of the grip portion, the first connection portion connected via the second vibration reduction mechanism, and the other end portion in the second direction of the grip portion. And one of the two first vibration reduction mechanisms is configured such that a distance from the first connection portion in the second direction is the second connection portion in the second direction. The other of the two first vibration reduction mechanisms is provided at a position shorter than the distance to the second connection portion, and the distance from the second connection portion in the second direction is the second direction in the second direction. It is preferable to be provided at a position shorter than the distance from the first connection portion.

  According to such a configuration, the first vibration reduction mechanism is provided in the vicinity of each of the first connection portion and the second connection portion that connect the intermediate connection portion and the grip portion. For this reason, the vibration transmitted from the main body part to the grip part can be reduced more effectively, and workability can be further improved. In addition, it is possible to prevent the gripping portion from being inclined in the longitudinal direction when the intermediate connection portion moves relative to the main body portion, and the balance of the gripping portion is lost and workability is impaired.

  The intermediate connection portion is formed with an insertion hole extending in the first direction, and the first vibration reduction mechanism extends in the first direction and one end portion in the first direction is connected to the main body portion. And an insertion portion in which the other end portion in the first direction is inserted into the insertion hole, and a first elastic body that is disposed outside the insertion portion and is sandwiched between the intermediate connection portion and the main body portion. The second vibration reduction mechanism includes a first member connected to the intermediate connection portion, a second member connected to the gripping portion, and interposed between the first member and the second member. And a second elastic body.

  According to such a configuration, the insertion portion that is inserted through the insertion hole provided in the intermediate connection portion and connected to the main body portion, and the second portion that is disposed outside the insertion portion and is sandwiched between the intermediate connection portion and the main body portion. A first vibration reducing mechanism is constituted by one elastic body. In addition, the second vibration reduction mechanism includes a first member connected to the intermediate connection portion, a second member connected to the grip portion, and a second elastic body interposed between the first member and the second member. Is configured. Therefore, the first vibration reduction mechanism and the second vibration reduction mechanism are realized with a simple configuration with a small number of parts.

  Moreover, it is preferable that a vibration reduction part further has a 3rd elastic body, and this 1st member is connected to this intermediate | middle connection part via this 3rd elastic body.

  According to such a structure, the 3rd elastic body is interposing on the transmission path | route of the vibration transmitted from a main-body part to a holding part. Thereby, the vibration transmitted from the main body portion to the grip portion can be further effectively reduced.

  The main body housing includes a motor housing that houses the motor, and the intermediate connection portion is connected to the motor housing via the first vibration reduction mechanism, and the motor housing in the first direction is connected to the motor housing. It is preferable to be configured to cover an end portion close to the grip portion.

  The spring constant of the first vibration reduction mechanism is preferably different from the spring constant of the second vibration reduction mechanism.

  According to such a configuration, since the first vibration reduction mechanism and the second vibration reduction mechanism have different spring constants, the frequency range of vibration that can be suitably reduced by the first vibration reduction mechanism and the second vibration reduction mechanism. Is different from the frequency region of vibration that can be suitably reduced. Thereby, the frequency region which can be suitably reduced can be widened, and the vibration transmitted from the main body to the gripping portion can be further effectively reduced.

  The spring constant of the first vibration reduction mechanism is preferably larger than the spring constant of the second vibration reduction mechanism.

  ADVANTAGE OF THE INVENTION According to this invention, the power tool which can reduce more the vibration transmitted to a handle | steering-wheel part from a main-body part, and can improve workability | operativity can be provided.

It is a fragmentary sectional view which shows the internal structure of the hammer drill by the 1st Embodiment of this invention. It is a disassembled perspective view which shows the motor housing of the hammer drill by the 1st Embodiment of this invention, a gear housing, a part of cylinder housing, a back cover, a 1st vibration reduction mechanism, a 2nd vibration reduction mechanism, and a handle part. 1 is an exploded perspective view showing a gear housing, a part of a cylinder housing, a back cover, a first vibration reduction mechanism, a second vibration reduction mechanism, and a handle portion of a hammer drill according to a first embodiment of the present invention. A state in which the motor housing and the gear housing are connected via the first vibration reduction mechanism is shown. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 1 and shows a first vibration reduction mechanism of the hammer drill according to the first embodiment of the present invention. FIG. 5 is a cross-sectional view taken along the line V-V of FIG. 1 and shows a second vibration reduction mechanism of the hammer drill according to the first embodiment of the present invention. It is a figure which shows the 1st vibration reduction mechanism of the hammer drill by the 1st modification of the 1st Embodiment of this invention. It is a figure which shows the 1st vibration reduction mechanism of the hammer drill by the 2nd modification of the 1st Embodiment of this invention. It is a fragmentary sectional view which shows the internal structure of the hammer drill by the 2nd Embodiment of this invention. It is a fragmentary sectional view which shows the internal structure of the hammer drill by the 3rd Embodiment of this invention.

<First Embodiment>
A hammer drill 1 as an example of a power tool according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 5.

  Hereinafter, with respect to the direction related to the hammer drill 1, “up” shown in FIG. 1 is defined as an upward direction, “down” is defined as a downward direction, “front” is defined as a forward direction, and “rear” is defined as a rear direction. Further, when the hammer drill 1 is viewed from the rear, “right” is defined as the right direction, and “left” is defined as the left direction.

<Outline of hammer drill 1>
A hammer drill 1 shown in FIG. 1 is an electric power tool for performing an operation of crushing a workpiece (for example, concrete, steel, wood, etc.). In the present embodiment, the hammer drill 1 uses the power of the secondary battery housed in the battery pack P as a drive power source. Further, the hammer drill 1 includes a “blow mode” in which only the striking force is applied to the tip tool E and a “rotation striking mode” in which a rotational force and a striking force are applied to the tip tool E as drive modes.

<Configuration of hammer drill 1>
The hammer drill 1 is provided between the main body 2 and the handle 3, the main body 2 configured to be detachable with the tip tool E, the handle 3 positioned behind the main body 2 and gripped by the operator. The vibration reducing unit 4 is provided.

<Main body 2>
As shown in FIG. 1, the main body 2 includes a main body housing 5, a motor 6, an inverter circuit board 7, a control box 8, a power transmission mechanism 9, a drive mechanism 10, and a tip tool mounting portion. 11.

<Main body housing 5>
As shown in FIG. 1, the main body housing 5 is a portion that forms an outline of the main body 2, and includes a motor housing 51, a gear housing 52, and a cylinder housing 53.

  As shown in FIGS. 1 and 2, the motor housing 51 has a substantially cylindrical shape extending in the vertical direction, and is located at the lower rear portion of the main body housing 5. The motor housing 51 is made of resin and accommodates the motor 6 and the like inside. 2 and 3, illustration of members housed inside the main body housing 5 and the handle portion 3 is omitted in order to avoid complication of the drawings.

  Further, as shown in FIG. 2, a first screw boss 51 </ b> A is provided substantially at the center in the left-right direction below the rear portion of the motor housing 51. Further, a second screw boss 51 </ b> B is provided on the left side above the rear part of the motor housing 51, and a third screw boss (not shown) is provided on the right part above the rear part. A female screw hole 51a extending in the front-rear direction is formed in each of the first screw boss 51A, the second screw boss 51B, and the third screw boss. The second screw boss 51 </ b> B and the third screw boss are provided at symmetrical positions with respect to a virtual plane that is orthogonal to the left-right direction and passes through the center of the motor housing 51 in the left-right direction.

  As shown in FIG. 1, the gear housing 52 is made of metal and is connected to the upper portion of the motor housing 51. The gear housing 52 has a first portion 52A, a second portion 52B, and a third portion 52C, and accommodates a part of the power transmission mechanism 9.

  As shown in FIG. 2, the first portion 52A and the second portion 52B have a substantially cylindrical shape extending in the up-down direction. The first portion 52A and the second portion 52B are provided side by side in the front-rear direction, and the rear portion of the first portion 52A and the front portion of the second portion 52B are connected. The internal space of the first part 52A and the internal space of the second part 52B communicate with each other, and a part of the power transmission mechanism 9 is accommodated in the communicated space. The third portion 52C has a substantially cylindrical shape extending in the vertical direction, and is connected to the upper portion of the second portion 52B.

  Further, a rib 52D extending in the left-right direction is provided at the rear part of the connection part connecting the second part 52B and the third part 52C, and a fourth screw boss is provided at the left end part and the right end part of the rib 52D. 52E and a fifth screw boss 52F are provided. Each of the fourth screw boss 52E and the fifth screw boss 52F is formed with a female screw hole 52a extending in the front-rear direction.

  As shown in FIG. 1, the cylinder housing 53 is connected to the front upper portion of the gear housing 52 and has a substantially cylindrical shape extending in the front-rear direction. The drive mechanism 10 is accommodated in the cylinder housing 53.

<Motor 6>
As shown in FIG. 1, the motor 6 is accommodated in the motor housing 51. The motor 6 is a DC brushless motor, and includes a rotating shaft 61, a rotor 62, and a stator 63.

  The rotating shaft 61 is a shaft extending in the vertical direction, and is rotatably supported by the motor housing 51 and the gear housing 52 via bearings. A fan 61 </ b> A is provided on the upper portion of the rotation shaft 61 so as to be rotatable integrally with the rotation shaft 61.

  The rotor 62 has a plurality of permanent magnets and is fixed to the rotary shaft 61 so as to rotate integrally with the rotary shaft 61. The stator 63 is provided outside the rotor 62 and supported by a rib extending upward from the inner peripheral surface of the motor housing 51. The stator 63 has a stator winding disposed so as to face the rotor 62.

<Inverter circuit board 7>
The inverter circuit board 7 is a circuit board having an annular shape in plan view, and is accommodated in the motor housing 51. The inverter circuit board 7 is located above the stator 63 of the motor 6 and is fixed to the stator 63 via an insulator. An inverter circuit including six FETs for driving the motor 6 is mounted on the lower surface of the inverter circuit board 7. A plurality of Hall elements for detecting the rotational position of the rotor 62 are mounted on the upper surface of the inverter circuit board 7.

<Control box 8>
The control box 8 is fixed to the outer peripheral surface of the rear portion of the motor housing 51, and houses a controller (not shown) for driving and controlling the motor 6 and various circuits necessary for driving and controlling the motor 6. The control unit and the like housed in the control box 8 are electrically connected to the inverter circuit board 7 and a battery mounting unit 32B described later. In the present embodiment, the controller is a microcomputer.

<Power transmission mechanism 9>
The power transmission mechanism 9 includes a pinion gear 91 fixed to the upper end of the rotation shaft 61 of the motor 6, a power conversion mechanism 92, and a rotation transmission mechanism 93.

  The power conversion mechanism 92 is a mechanism that converts the rotational force of the rotation shaft 61 of the motor 6 into a reciprocating motion and transmits it to the drive mechanism 10, and includes a crank shaft 92A, a gear 92B, a crank weight 92C, a crank pin 92D, A connecting rod 92E. The power conversion mechanism 92 is an example of the “reciprocating motion conversion mechanism” in the present invention.

  The crankshaft 92 </ b> A extends in the vertical direction, is disposed behind the pinion gear 91, and is rotatably supported by the gear housing 52. The gear 92 </ b> B is coaxially fixed to the crankshaft 92 </ b> A and meshes with the pinion gear 91. The crank weight 92C is fixed to the upper end of the crankshaft 92A. The crank pin 92D extends in the vertical direction, and is provided at a position eccentric to the rotational axis of the crank shaft 92A on the upper surface of the crank weight 92C. The connecting rod 92 </ b> E extends in the front-rear direction, a crank pin 92 </ b> D is inserted into a rear end portion thereof, and a front end portion thereof is connected to the drive mechanism 10.

  The rotation transmission mechanism 93 is a mechanism that can transmit the rotational force of the rotation shaft 61 of the motor 6 to the drive mechanism 10, and includes a rotation transmission shaft 93A, a gear 93B, a bevel gear 93C, and a clutch 93D.

  The rotation transmission shaft 93 </ b> A extends in the vertical direction, is disposed in front of the pinion gear 91, and is rotatably supported by the gear housing 52. A gear portion is provided at the upper end portion of the rotation transmission shaft 93A. The gear 93 </ b> B is coaxially fixed to the rotation transmission shaft 93 </ b> A and meshes with the pinion gear 91. The bevel gear 93C is provided so as to cover an outer periphery of a rear portion of a cylinder 10A described later. The bevel gear 93C is configured to be rotatable relative to the cylinder 10A and meshes with a gear portion of the rotation transmission shaft 93A.

  The clutch 93D is a cylindrical member provided on the outer periphery of the cylinder 10A so as to rotate integrally with the cylinder 10A, and is positioned in front of the bevel gear 93C. The clutch 93D is provided to be movable in the front-rear direction with respect to the cylinder 10A. When the clutch 93D is moved rearward, the clutch 93D is connected to the bevel gear 93C. When the clutch 93D is moved forward, the connection with the bevel gear 93C is released. It will be in the state. The state in which the clutch 93D and the bevel gear 93C are connected is a state in which the drive mode is set to the “rotating impact mode”. In this state, the cylinder 10A, the clutch 93D, and the bevel gear 93C rotate together. On the other hand, the state in which the connection is interrupted is a state in which the drive mode is set to the “blow mode”. In this state, the bevel gear 93C idles, and the rotational force of the bevel gear 93C is not transmitted to the clutch 93D and the cylinder 10A. Note that the movement of the clutch 93D in the front-rear direction, that is, the switching of the drive mode is performed by operating a drive mode switch (not shown) by an operator.

<Drive mechanism 10>
The drive mechanism 10 is a mechanism that applies a striking force or a rotational force and a striking force to the tip tool E mounted on the tip tool mounting portion 11. The drive mechanism 10 is located above the rotation transmission mechanism 93 and is accommodated in the cylinder housing 53. The drive mechanism 10 includes a cylinder 10A, a piston 10B, a striker 10C, and an intermediate 10D.

  The cylinder 10A has a substantially cylindrical shape extending in the front-rear direction, and is provided inside the cylinder housing 53 so as to be rotatable about its own axis. The piston 10B, the striker 10C, and the intermediate element 10D are arranged in this order from the rear in the cylinder 10A, and are configured to be slidable in the front-rear direction with respect to the inner peripheral surface of the cylinder 10A. The piston 10B is connected to the front end of the connecting rod 92E, and an air chamber 10a is defined between the piston 10B and the striker 10C. The cylinder 10A has a plurality of breathing holes penetrating from the inside to the outside of the cylinder 10A. Each of the piston 10B, the striker 10C, and the intermediate element 10D is an example of the “drive unit” in the present invention. The front-rear direction is an example of the “first direction” in the present invention.

<Tip tool mounting part 11>
The tip tool mounting portion 11 is connected to the front portion of the cylinder housing 53, and is configured so that the tip tool E can be attached and detached.

<Handle part 3>
The handle part 3 is connected to the main body part 2 via the vibration reducing part 4, and has a grip part 31, a lower connection part 32, and an upper connection part 33.

<Grip part 31>
The grip portion 31 is a portion that is gripped by an operator during work, and has a substantially cylindrical shape that extends in the vertical direction. The grip portion 31 includes a trigger 31A and a switch mechanism 31B. The trigger 31 </ b> A is provided at an upper front portion of the grip portion 31, and is configured to be operable while the operator grips the grip portion 31. The switch mechanism 31 </ b> B is housed inside the grip portion 31, mechanically connected to the trigger 31 </ b> A, and electrically connected to a controller inside the control box 8. The switch mechanism 31B detects that the trigger 31A has been pulled by the operator, and outputs a start signal for starting driving of the motor 6 to the controller. The vertical direction is an example of the “second direction” in the present invention.

<Lower connection portion 32>
The lower connection portion 32 extends forward from the lower end portion of the grip portion 31 and has a substantially rectangular tube shape opening forward. The lower connection part 32 includes a shaft 32A and a battery mounting part 32B. The shaft 32 </ b> A is located at the front end portion of the lower connection portion 32, and extends leftward from the right portion to the left portion of the inner peripheral surface of the lower connection portion 32. The battery mounting part 32B is provided in the lower part of the lower side connection part 32, and is comprised so that the battery pack P can be attached or detached. The battery mounting part 32B has a terminal part (not shown) connected to a secondary battery housed in the battery pack P in a state where the battery pack P is mounted on the battery mounting part 32B. The terminal part of the battery mounting part 32B is electrically connected to the motor 6, the controller, and the like. Thereby, electric power can be supplied to the motor 6, the controller, etc. with the battery pack P mounted in the battery mounting portion 32B.

<Upper connection portion 33>
The upper connection portion 33 extends forward from the upper end portion of the grip portion 31 and has a substantially rectangular tube shape opening forward. A part of the vibration reduction unit 4 is accommodated in the upper connection portion 33.

<Vibration reduction unit 4>
The vibration reducing part 4 is provided between the main body part 2 and the handle part 3 (that is, interposed between the main body part 2 and the handle part 3), and the main body part 2 and the handle part 3 are connected to each other. It is a mechanism for reducing vibration transmitted to the handle portion 3 from the main body portion 2 while being connected. The vibration reducing unit 4 includes a back cover 41, a plurality of first vibration reducing mechanisms 42, and a second vibration reducing mechanism 43. In the present embodiment, the vibration reducing unit 4 has five first vibration reducing mechanisms 42.

<Back cover 41>
The back cover 41 is connected to the main body 2 via five first vibration reduction mechanisms 42 so as to be movable relative to the main body 2 in the front-rear direction. The back cover 41 covers the rear part of the main body 2, that is, the rear part of the motor housing 51 and the rear part of the gear housing 52. The back cover 41 includes a cover portion 41A, a inserted portion 41B, and a receiving portion 41C. The back cover 41 is an example of the “intermediate connection portion” in the present invention.

<Cover part 41A>
The cover portion 41A has a substantially C shape that extends in the front-rear direction and opens forward in a plan sectional view. The cover portion 41A is connected to the main body portion 2 via five first vibration reduction mechanisms 42 so as to be movable relative to the main body portion 2 in the front-rear direction, and the rear portion of the main body portion 2 (that is, the motor housing 51). The rear part and the rear part of the gear housing 52).

  The cover portion 41A is formed with five through holes 41a through which a male screw member 42A (described later) and a collar 42B (described later) of the first vibration reduction mechanism 42 are inserted. The five through holes 41a are formed at five locations in the cover portion 41A that overlap the first screw boss 51A, the second screw boss 51B, the third screw boss, the fourth screw boss 52E, and the fifth screw boss 52F when viewed from the front-rear direction. . More specifically, the five through-holes 41a are formed at a total of five locations: a substantially central portion in the left-right direction at the lower portion of the cover portion 41A, a left portion and a right portion in the central portion in the vertical direction, and a left portion and a right portion in the upper portion. Has been. The through hole 41a is an example of the “insertion hole” in the present invention.

<Inserted part 41B>
The insertion portion 41B protrudes rearward from the rear surface of the lower portion of the cover portion 41A and extends in the left-right direction, and is accommodated in the front portion of the lower connection portion 32. A through-hole 41b is formed in the insertion part 41B so as to penetrate the insertion part 41B in the left-right direction. The shaft 32A of the lower connection portion 32 is inserted through the through hole 41b. Thereby, the handle | steering-wheel part 3 is supported by the to-be-inserted part 41B so that rotation is possible centering on the shaft 32A. The inserted portion 41B is an example of the “second connecting portion” in the present invention.

<Receiving part 41C>
The receiving portion 41C has a substantially rectangular tube shape extending in the front-rear direction, and is provided on the upper portion of the cover portion 41A. The front end portion of the second vibration reduction mechanism 43 is inserted into the receiving portion 41C. The receiving portion 41C is an example of the “first connecting portion” in the present invention.

<First vibration reduction mechanism 42>
The first vibration reduction mechanism 42 is a mechanism that reduces vibration transmitted from the main body 2 to the back cover 41, and is provided at five locations on the cover portion 41A. Specifically, the first vibration reduction mechanism 42 has five locations where the through-holes 41a are formed in the cover portion 41A of the back cover 41, that is, the substantially horizontal portion in the left-right direction and the central portion in the vertical direction in the lower portion of the cover portion 41A. It is provided at a total of five locations, left and right, and left and right at the top. In the following description, when it is necessary to individually explain the five first vibration reduction mechanisms 42, the first vibration reduction mechanism 42 provided at the substantially central portion in the left-right direction at the lower portion of the cover portion 41A is used. Lower vibration reduction mechanism 421, first vibration reduction mechanism 42 provided at the left portion at the substantially central portion in the vertical direction, left central vibration reduction mechanism 422, first vibration reduction mechanism 42 provided at the right portion at the substantially central portion in the vertical direction. Is the right center vibration reduction mechanism 423, the first vibration reduction mechanism 42 provided on the upper left side is called the upper left vibration reduction mechanism 424, and the first vibration reduction mechanism 42 provided on the upper right side is called the upper right vibration reduction mechanism 425.

  The lower vibration reduction mechanism 421, the left central vibration reduction mechanism 422, and the right central vibration reduction mechanism 423 are connected to the first screw boss 51A, the second screw boss 51B, and the third screw boss of the motor housing 51, respectively. The cover part 41A and the motor housing 51 are connected. The upper left vibration reduction mechanism 424 and the upper right vibration reduction mechanism 425 are connected to the fourth screw boss 52E and the fifth screw boss 52F of the gear housing 52, respectively, and connect the cover portion 41A and the gear housing 52.

  Here, the details of the first vibration reduction mechanism 42 will be described with reference to FIG. Since the five first vibration reduction mechanisms 42 have the same configuration, the first vibration reduction mechanism 42, that is, the lower vibration reduction mechanism 421 provided in the lower left portion of the cover portion 41A and substantially at the center in the left-right direction is taken as an example. Therefore, the description of the other four first vibration reduction mechanisms 42 is omitted.

  As shown in FIG. 4, the lower vibration reducing mechanism 421 includes a male screw member 42A, a collar 42B, and an elastic body 42C.

  The male screw member 42A has a screw part 42D and a screw head part 42E extending in the front-rear direction. The screw portion 42D is threaded into the female screw hole 51a of the first screw boss 51A while being inserted into the through hole 41a of the cover portion 41A. The screw head portion 42E is a portion whose diameter is larger than that of the screw portion 42D, and is provided at the rear end portion of the screw portion 42D. The screw head portion 42E restricts the rearward movement of the cover portion 41A. The male screw member 42A is an example of the “insertion portion” in the present invention.

  The collar 42B is a member for defining a screwing amount of the male screw member 42A to the first screw boss 51A (in other words, a distance in the front-rear direction between the rear end surface of the first screw boss 51A and the front end surface of the screw head 42E). There is a cylindrical shape extending in the front-rear direction. The inner diameter of the collar 42B is configured to be slightly larger than the diameter of the screw portion 42D of the male screw member 42A and the diameter of the female screw hole 51a, and the outer diameter of the collar 42B is slightly smaller than the diameter of the through hole 41a of the cover portion 41A. It is configured to be small. The collar 42B is disposed between the first screw boss 51A and the screw head 42E in a state where the screw portion 42D is inserted through the through hole 41a and the front end of the collar 42B is the first end. The rear end surface of the screw boss 51A is in contact with the rear end surface of the collar 42B and is in contact with the front end surface of the screw head 42E. The cover portion 41A is slidable with respect to the outer peripheral surface of the collar 42B.

  The elastic body 42C has an annular shape extending in the front-rear direction, and the inner diameter of the elastic body 42C is slightly larger than the collar 42B. The elastic body 42C is disposed outside the screw portion 42D and the collar 42B of the male screw member 42A. More specifically, the elastic body 42C has the screw portion 42D and the collar 42B inserted therethrough and is slightly compressed in the front-rear direction, and the rear end surface of the first screw boss 51A and the front surface of the cover portion 41A of the back cover 41. The front end of the elastic body 42C is in contact with the rear end surface of the first screw boss 51A, and the rear end of the elastic body 42C is in contact with the front surface of the cover portion 41A. In the present embodiment, the elastic body 42C is made of rubber. The elastic body 42C has the cover portion 41A and the main body portion from the state shown in FIG. 4 (the external drill is not applied to the hammer drill 1 and the rear surface of the cover portion 41A is in contact with the front surface of the screw head 42E of the male screw member 42A). 4 is further compressed in the front-rear direction from the state shown in FIG. Thereby, the first vibration reduction mechanism 42 can reduce vibration generated in the main body 2 and transmitted from the main body 2 to the back cover 41. The elastic body 42C is an example of the “first elastic body” in the present invention.

<Second vibration reduction mechanism 43>
The second vibration reduction mechanism 43 is a mechanism for reducing vibration transmitted from the back cover 41 to the handle portion 3, and as shown in FIGS. 1 to 3, the first vibration reduction mechanism 42 and the grip portion 31. (Provided). More specifically, it is provided between the back cover 41 and the handle portion 3. That is, the back cover 41 and the handle portion 3 are connected via the second vibration reduction mechanism 43.

  Here, the detail of the 2nd vibration reduction mechanism 43 is demonstrated, referring FIG. As shown in FIG. 5, the second vibration reduction mechanism 43 includes a first elastic support member 431, a second elastic support member 432, and four cylindrical rubber elastic bodies 433 extending in the vertical direction. A transatomic unit having

  The first elastic support member 431 is fixed to the receiving portion 41C by two bolts (not shown) while being inserted into the receiving portion 41C of the back cover 41. The first elastic support member 431 is formed with an oval first groove 431a and a second groove 431b communicating with the first groove 431a. The first groove 431a is formed to extend in the front-rear direction. The second groove 431b is located behind the first groove 431a, has a narrower width than the first groove 431a, and opens behind the first elastic support member 431. In addition, first inclined surfaces 431A are formed on both side walls of the first elastic support member 431. The first elastic support member 431 is an example of the “first member” in the present invention.

  The second elastic support member 432 is fixed to the upper connection portion 33 by two bolts 434 while being inserted into the upper connection portion 33 of the handle portion 3. The second elastic support member 432 is provided with a column part 432A and a columnar part 432B. The second elastic support member 432 is an example of the “second member” in the present invention.

  The column portion 432A extends forward from the rear portion of the second elastic support member 432 and penetrates through the second groove 431b. The cylindrical portion 432B is provided at the tip of the column portion 432A, has a diameter longer than the width of the second groove 431b, and is slidable in the front-rear direction with respect to the first elastic support member 431 in the first groove 431a. Are arranged. Thereby, the back cover 41 and the upper connection part 33 and the grip part 31 of the handle part 3 are relatively movable in the front-rear direction. Moreover, since the diameter of the cylindrical part 432B is longer than the width of the second groove 431b, the cylindrical part 432B can be prevented from slipping out of the first groove 431a and the second groove 431b, and the back cover 41 and the handle part 3 can be prevented. Separation beyond the predetermined distance from the upper connection portion 33 can be restricted.

  Further, a second inclined surface 432C extending in parallel with the first inclined surface 431A and spaced apart from the first inclined surface 431A by a predetermined distance is formed on the inner wall of the second elastic support member 432. The four elastic bodies 433 are interposed between the first inclined surface 431A and the second inclined surface 432C. Thereby, the handle portion 3 and the back cover 41 are connected via the four elastic bodies 433. Further, the elastic body 433 moves relative to the direction in which the second elastic support member 432 and the first elastic support member 431 approach each other in the front-rear direction from the state of FIG. 5 (a state in which no external force is applied to the hammer drill 1). Compressed while rolling between the second inclined surface 432C and the first inclined surface 431A. Thereby, the second vibration reduction mechanism 43 can reduce vibration transmitted from the back cover 41 to the handle portion 3. In order to prevent the second vibration reduction mechanism 43 from being exposed to the outside, it is possible to extend and contract in the front-rear direction between the rear end portion of the receiving portion 41C of the back cover 41 and the front end portion of the upper connection portion 33 of the handle portion 3. A bellows-like rubber cover 1A is provided. The elastic body 433 is an example of the “second elastic body” in the present invention.

<Characteristics of First Vibration Reduction Mechanism 42 and Second Vibration Reduction Mechanism 43>
The characteristics of the first vibration reduction mechanism 42 and the characteristics of the second vibration reduction mechanism 43 are different from each other. In the present embodiment, the spring constant of the first vibration reduction mechanism 42 and the spring constant of the second vibration reduction mechanism 43 are different from each other. For this reason, the frequency range of the vibration that the first vibration reduction mechanism 42 can preferably absorb and reduce is different from the frequency range of the vibration that the second vibration reduction mechanism 43 can suitably reduce the absorption. More specifically, the spring constant of the first vibration reduction mechanism 42 is configured to be larger than the spring constant of the second vibration reduction mechanism 43. For this reason, the frequency range of vibration that the first vibration reduction mechanism 42 can preferably absorb and reduce is higher than the frequency range of vibration that the second vibration reduction mechanism 43 can suitably reduce absorption. In the present specification, the spring constant of the first vibration reduction mechanism 42 refers to the first vibration reduction mechanism at the moment when the elastic body 42C is loaded in the front-rear direction and the elastic body 42C starts to be further compressed from the state of FIG. 42 is the spring constant of the whole. In the present embodiment, the spring constant of the entire first vibration reduction mechanism 42 and the spring constant of the elastic body 42C are the same. The spring constant of the second vibration reduction mechanism 43 is the distance from the front end of the first elastic support member 431 to the rear end of the second elastic support member 432 when a load in the front-rear direction is applied to the second vibration reduction mechanism 43. 5 represents the spring constant of the entire second vibration reduction mechanism 43 at the moment when it starts to contract from the state 5 (the moment when the elastic body 433 starts to be compressed while rolling).

<Operation of hammer drill 1>
Here, the operation of the hammer drill 1 will be described by taking as an example the case where the drive mode is set to the “blow mode”.

  The operator presses the tip tool E mounted on the tip tool mounting portion 11 against the workpiece while holding the grip portion 31 of the handle portion 3. When the operator operates the trigger 31A in this state, a start signal is output from the switch mechanism 31B to the controller, and the controller starts driving control of the motor 6. When the drive control is started, the power of the secondary battery in the battery pack P is supplied to the motor 6 and the rotating shaft 61 rotates. The rotational force of the rotary shaft 61 is transmitted to the crankshaft 92A via the pinion gear 91 and the gear 92B. The rotational force of the crankshaft 92A is converted into a back-and-forth reciprocating motion of the piston 10B inside the cylinder 10A by the crank weight 92C, the crankpin 92D, and the connecting rod 92E.

  The reciprocating motion of the piston 10B repeatedly increases and decreases the pressure of the air inside the air chamber 10a, and the striking force is repeatedly applied to the striking element 10C, so that the striking element 10C reciprocates in the front-rear direction. Thereby, the operation in which the striker 10C strikes the rear end of the intermediate 10D is repeated, and the impact force is periodically and repeatedly transmitted to the tip tool E through the intermediate 10D. The workpiece is crushed by the striking force periodically applied to the tip tool E.

<Vibration generated in the main body 2>
During the crushing operation of the hammer drill 1 described above, vibrations in the front-rear direction mainly due to the back-and-forth movement in the front-rear direction of the piston 10B, the striker 10C, and the intermediate element 10D are generated in the main body 2. The frequency of the vibration in the front-rear direction generated in the main body 2 is not constant, and changes due to various factors such as the driving state of the driving mechanism 10, fluctuations in the load applied to the motor 6, and the hardness of the workpiece. To do.

<The effect of the hammer drill 1 by 1st Embodiment>
The hammer drill 1 according to the first embodiment of the present invention includes a main body housing 5, a motor 6 supported by the main body housing 5, and a driving mechanism 10 that is driven by the rotational force of the motor 6 (rotating shaft 61). And the gripping part 31 that is located apart from the main body part 2, and is provided between the main body part 2 and the gripping part 31, and the main body part 2 and the gripping part 31 are connected and transmitted from the main body part 2 to the gripping part 31. The vibration reduction unit 4 is configured to reduce the generated vibration. The vibration reduction unit 4 includes a first vibration reduction mechanism 42 connected to the main body unit 2, and between the first vibration reduction mechanism 42 and the grip unit 31. And a second vibration reduction mechanism 43 provided on the head.

  According to the above configuration, the first vibration reduction mechanism 42 and the second vibration reduction mechanism 43 are interposed on the transmission path of the vibration generated in the main body 2 and transmitted from the main body 2 to the grip portion 31. For this reason, it is possible to further reduce the vibration transmitted from the main body 2 to the grip 31 compared to a configuration in which only one vibration reduction mechanism is interposed on the vibration transmission path, thereby further improving workability. Can be improved.

  The hammer drill 1 also includes a power conversion mechanism 92 that converts the rotational force of the motor 6 into reciprocating motion to reciprocate the piston 10B, the striker 10C, and the intermediate element 10D in the front-rear direction.

  Further, the vibration reduction unit 4 of the hammer drill 1 includes a back cover 41 connected to the main body unit 2 via the first vibration reduction mechanism 42 and connected to the second vibration reduction mechanism 43. Is movable relative to the main body 2 and the grip 31 in the front-rear direction.

  According to the above configuration, the direction in which the drive mechanism 10 reciprocates and the direction in which the back cover 41 can be moved relative to the main body 2 and the grip 31 by the first vibration reduction mechanism 42 and the second vibration reduction mechanism 43. And are consistent. For this reason, the vibration generated in the main body 2 by the drive mechanism 10 can be effectively reduced by the first vibration reduction mechanism 42 and the second vibration reduction mechanism 43. Further, the direction in which the back cover 41 can be moved relative to the main body 2 by the first vibration reduction mechanism 42 and the direction in which the back cover 41 can be moved relative to the grip part 31 by the second vibration reduction mechanism 43. And are consistent. For this reason, the combination of the first vibration reduction mechanism 42 and the second vibration reduction mechanism 43 can effectively reduce the vibration generated in the main body 2 by the drive mechanism 10.

  In addition, the grip portion 31 of the hammer drill 1 extends in the vertical direction orthogonal to the front-rear direction, and the vibration reduction unit 4 includes two first vibration reduction mechanisms 42 (for example, left A central vibration reduction mechanism 422 and an upper left vibration reduction mechanism 424). For this reason, the first vibration reduction mechanism 42 is provided at each position separated in the longitudinal direction of the grip portion 31 (in the present embodiment, the vertical direction). For this reason, when the back cover 41 moves relative to the main body 2, the longitudinal direction of the grip portion 31 is not easily tilted, and the balance of the grip portion 31 is lost and workability is impaired.

  The back cover 41 includes a receiving portion 41C connected to the upper end portion in the vertical direction of the grip portion 31 via the second vibration reduction mechanism 43, and an insertion portion connected to the lower end portion in the vertical direction of the grip portion 31. 41B. Furthermore, an upper left vibration reducing mechanism 424 is provided at a position where the distance from the receiving portion 41C in the vertical direction is shorter than the distance from the inserted portion 41B in the vertical direction, and the distance from the inserted portion 41B in the vertical direction is A left central vibration reduction mechanism 422 is provided at a position shorter than the distance from the receiving portion 41C in the direction. That is, the upper left vibration reducing mechanism 424 is provided in the vicinity of the receiving portion 41C, and the left central vibration reducing mechanism 422 is provided in the vicinity of the inserted portion 41B. Thereby, the vibration transmitted to the holding part 31 from the main-body part 2 can be reduced more effectively, and workability | operativity can further be improved. Moreover, when the back cover 41 moves relative to the main body 2, the longitudinal direction of the grip portion 31 is not easily tilted, and it is possible to suppress the balance of the grip portion 31 from being lost and the workability from being impaired.

  In the hammer drill 1, the first vibration reduction mechanism 42 has a male screw extending in the front-rear direction and having one end in the front-rear direction screwed to the main body 2 and the other end in the up-down direction inserted into the through hole 41 a. The member 42 </ b> A and an elastic body 42 </ b> C that is disposed outside the male screw member 42 </ b> A and is sandwiched between the back cover 41 and the main body 2. Further, the second vibration reduction mechanism 43 includes a first elastic support member 431 connected to the back cover 41, a second elastic support member 432 connected to the grip portion 31, and the first elastic support member 431 and the second elastic member. And an elastic body 433 interposed between the support member 432 and the support member 432.

  According to the above configuration, the male screw member 42A inserted through the through hole 41a provided in the back cover 41 and connected to the main body portion 2, and the back cover 41 and the main body portion 2 disposed outside the male screw member 42A. The first vibration reduction mechanism 42 is configured by the elastic body 42C sandwiched between the two. Further, the first elastic support member 431 connected to the back cover 41, the second elastic support member 432 connected to the grip portion 31, and the first elastic support member 431 and the second elastic support member 432 are interposed. The second vibration reduction mechanism 43 is configured by the elastic body 433 to be performed. Therefore, the first vibration reduction mechanism 42 and the second vibration reduction mechanism 43 are realized with a simple configuration with a small number of parts.

  In the hammer drill 1, the main body housing 5 has a motor housing 51 that houses the motor 6, and the back cover 41 is connected to the motor housing 51 via the first vibration reduction mechanism 42. Further, the back cover 41 is configured to cover an end portion (that is, a rear end portion of the motor housing 51) near the grip portion 31 in the front-rear direction of the motor housing 51.

  Further, in the hammer drill 1, the characteristics of the first vibration reduction mechanism 42 and the characteristics of the second vibration reduction mechanism 43 are different from each other. Specifically, the spring constant of the first vibration reduction mechanism 42 is different from the spring constant of the second vibration reduction mechanism 43. For this reason, the frequency range of vibrations that can be suitably reduced by the first vibration reduction mechanism 42 is different from the frequency range of vibrations that can be suitably reduced by the second vibration reduction mechanism 43. Thereby, the frequency region of the vibration that can be suitably reduced can be widened, and the vibration transmitted from the main body 2 to the grip portion 31 in the hammer drill 1 in which the frequency of vibration generated during the crushing operation changes can be more effectively achieved. Can be reduced.

<First Modification of First Embodiment>
Next, a first modification of the first embodiment of the present invention will be described with reference to FIG. The same members as those of the hammer drill 1 according to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different portions are mainly described.

  As shown in FIG. 6, the hammer drill according to the present modification has a first vibration reduction mechanism 142 instead of the first vibration reduction mechanism 42 in the first embodiment. The first vibration reduction mechanism 142 is different from the first vibration reduction mechanism 42 in that an elastic body 142C is provided.

  The elastic body 142C is a coil spring extending in the front-rear direction, and has a spring constant different from that of the elastic body 42C. The elastic body 142C is provided between the cover portion 41A of the back cover 41 and the motor housing 51. The elastic body 142C is disposed outward so as to surround the screw portion 42D, the collar 42B, the elastic body 42C, and the first screw boss 51A. The elastic body 142C is sandwiched between the rear surface of the motor housing 51 and the front surface of the cover portion 41A of the back cover 41 in a state where the elastic body 142C is slightly compressed in the front-rear direction, and the front end of the elastic body 142C is the front end of the motor housing 51. The elastic body 142C is in contact with the rear surface and the rear end of the elastic body 142C is in contact with the front surface of the cover portion 41A. The elastic body 142C is an example of the “first elastic body” in the present invention.

  In the present modification, since the elastic body 42C and the elastic body 142C are provided in parallel between the back cover 41 and the motor housing 51, the spring constant of the first vibration reduction mechanism 142 is the first vibration reduction mechanism. It is larger than the spring constant of 42. Also in this modification, there exists an effect similar to the hammer drill 1 by 1st Embodiment.

<Second Modification of First Embodiment>
Next, a second modification of the first embodiment of the present invention will be described with reference to FIG. The same reference numerals are given to the same members as those of the hammer drill 1 according to the first embodiment or the hammer drill according to the first modification, and description thereof will be omitted, and different portions will be mainly described.

  As shown in FIG. 7, the hammer drill according to the second modified example has a first vibration reducing mechanism 242 instead of the first vibration reducing mechanism 42 in the first modified example. The first vibration reduction mechanism 242 is different from the first vibration reduction mechanism 42 in that it includes an elastic body 142C and does not include the elastic body 42C.

  In the hammer drill according to the second modification, the first vibration reduction mechanism 242 includes an elastic body 142C having a spring constant different from that of the elastic body 42C. For this reason, the spring constant of the first vibration reduction mechanism 242 is different from the spring constant of the first vibration reduction mechanism 42. Also in this modification, there exists an effect similar to the hammer drill 1 by 1st Embodiment.

<Second Embodiment>
Next, a hammer drill 501 according to a second embodiment of the present invention will be described with reference to FIG. The same members as those of the hammer drill 1 according to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different portions are mainly described.

  As shown in FIG. 8, the hammer drill 501 includes a third vibration reduction mechanism 544. Moreover, the lower side connection part 32 of the handle | steering-wheel part 3 in the hammer drill 501 has the shaft 532A of the rhombus rhombus instead of the shaft 32A in 1st Embodiment. Further, the insertion portion 41B of the back cover 41 in the hammer drill 501 is formed with a substantially square through hole 541b in the side view, not the through hole 41b in the first embodiment.

  The third vibration reduction mechanism 544 is a Knight Hart spring having a substantially square frame body and four elastic bodies (rubbers in the present embodiment), and is provided between the back cover 41 and the handle portion 3. Yes. More specifically, the third vibration reduction mechanism 544 is interposed between the through hole 541b of the insertion part 41B and the shaft 532A of the lower connection part 32. Thereby, the vibration transmitted to the handle | steering-wheel part 3 from the main-body part 2 can be reduced more effectively.

<Third Embodiment>
Next, a hammer drill 601 according to a third embodiment of the present invention will be described with reference to FIG. The same members as those of the hammer drill 1 according to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different portions are mainly described.

  As shown in FIG. 9, the hammer drill 601 includes an elastic body 644. Further, a concave portion recessed backward is formed at the front end of the first elastic support member 431 of the second vibration reduction mechanism 43 in the hammer drill 601. Furthermore, the back cover 41 in the hammer drill 601 has a box-shaped receiving portion 641C that opens rearward, instead of the receiving portion 41C in the first embodiment.

  The elastic body 644 is a coil spring extending in the front-rear direction, and is interposed between the back cover 41 and the second vibration reduction mechanism 43. More specifically, the front end of the elastic body 644 is in contact with the rear surface of the front wall of the receiving portion 641C, and the rear end is in contact with the concave portion of the first elastic support member 431. The spring constant of the elastic body 644 is smaller than the spring constant of the second vibration reducing mechanism 43. The elastic body 644 is an example of the “third elastic body” in the present invention. The receiving portion 641C is an example of the “first connecting portion” in the present invention.

  Thus, the vibration reducing unit 4 in the hammer drill 601 according to the third embodiment has the elastic body 644 (that is, a coil spring), and the first elastic support member 431 is attached to the back cover 41 via the elastic body 644. It is connected. Thereby, the vibration transmitted from the main-body part 2 to the holding part 31 can be reduced further effectively.

  The power tool according to the present invention is not limited to the above-described embodiments and modifications, and various modifications are possible within the scope of the gist of the invention described in the claims. For example, in the hammer drill 601 according to the third embodiment of the present invention, the vibration reducing unit 4 does not include the first vibration reducing mechanism 42 and the back cover 41 is fixed to the main body 2 so as not to be relatively movable. Also good. Even in this case, the elastic body 644 and the second vibration reduction mechanism 43 having different characteristics (specifically, spring constants) are interposed on the transmission path of vibration transmitted from the main body 2 to the handle 3. Therefore, the frequency region that can be suitably reduced can be widened, and vibration transmitted from the main body 2 to the grip portion 31 can be more effectively reduced.

  In the present embodiment, the hammer drills 1, 501, and 601 have been described as examples. However, the present invention can also be applied to power tools other than hammer drills, for example, power tools that reciprocate tip tools such as saver saws and vibration drills. It is. In the present embodiment, the hammer drill 1 which is an electric power tool has been described as an example. However, the power source of the power tool is not limited to the electric type, and the present invention is a pneumatic power tool, a combustion type power tool. It can also be applied to power tools.

  DESCRIPTION OF SYMBOLS 1,501,601 ... hammer drill 2 ... main-body part 3 ... handle | steering-wheel part 4 ... vibration reduction part 5 ... main-body housing 6 ... motor 9 ... power transmission mechanism 10 ... drive mechanism 10A ... cylinder 10B ... piston 10C ... striker 10D ... meson 31 ... Grasping part 32 ... Lower connection part 33 ... Upper connection part 41 ... Back cover 41a ... Through hole 41A ... Cover part 41B ... Insertion part 41C, 641C ... Receiving part 42, 142, 242 ... First vibration reduction mechanism 42A ... Male screw member 42B ... Collar 42C, 142C ... Elastic body 43 ... Second vibration reduction mechanism 51 ... Motor housing 52 ... Gear housing 53 ... Cylinder housing 61 ... Rotating shaft 91 ... Pinion gear 92 ... Power conversion mechanism 93 ... Rotation transmission mechanism 431 ... first elastic support member 432 ... second elastic support member 43 ... elastic body 644 ... elastic body

Claims (10)

A main body having a main body housing, a motor supported by the main body housing, and a drive unit supported by the main body housing and driven by the rotational force of the motor;
A gripping part positioned away from the main body part;
A vibration reducing part that is provided between the main body part and the gripping part and connects the main body part and the gripping part to reduce vibration transmitted from the main body part to the gripping part;
The vibration reducing portion includes a first vibration reducing mechanism connected to the main body portion, and a second vibration reducing mechanism provided between the first vibration reducing mechanism and the grip portion. Power tool to do.   2. The power tool according to claim 1, further comprising a reciprocating motion conversion mechanism that converts a rotational force of the motor into a reciprocating motion and drives the driving unit to reciprocate in a first direction. The vibration reduction portion further includes an intermediate connection portion connected to the main body portion via the first vibration reduction mechanism and connected to the second vibration reduction mechanism,
The power tool according to claim 2, wherein the intermediate connecting portion is movable relative to the main body portion and the grip portion in the first direction. The grip portion extends in a second direction orthogonal to the first direction,
4. The power tool according to claim 3, wherein the vibration reduction unit includes two first vibration reduction mechanisms that are spaced apart from each other in the second direction. The intermediate connection portion is connected to one end portion of the grip portion in the second direction, the first connection portion connected via the second vibration reduction mechanism, and the other end portion of the grip portion in the second direction. A second connecting portion,
One of the two first vibration reduction mechanisms is provided at a position where the distance from the first connection portion in the second direction is shorter than the distance from the second connection portion in the second direction. ,
The other of the two first vibration reduction mechanisms is provided at a position where the distance from the second connection portion in the second direction is shorter than the distance from the first connection portion in the second direction. The power tool according to claim 4, wherein the power tool is provided. An insertion hole extending in the first direction is formed in the intermediate connection portion,
The first vibration reduction mechanism includes an insertion portion extending in the first direction and having one end portion in the first direction connected to the main body portion and the other end portion in the first direction being inserted into the insertion hole; A first elastic body disposed outside the insertion portion and sandwiched between the intermediate connection portion and the main body portion;
The second vibration reduction mechanism includes a first member connected to the intermediate connection portion, a second member connected to the grip portion, and a second member interposed between the first member and the second member. The power tool according to claim 3, further comprising an elastic body. The vibration reducing unit further includes a third elastic body,
The power tool according to claim 6, wherein the first member is connected to the intermediate connection portion via the third elastic body. The body housing has a motor housing that houses the motor,
The intermediate connection portion is connected to the motor housing via the first vibration reduction mechanism, and is configured to cover an end portion of the motor housing close to the grip portion in the first direction. The power tool according to any one of claims 3 to 7.   The power tool according to any one of claims 1 to 8, wherein a spring constant of the first vibration reduction mechanism is different from a spring constant of the second vibration reduction mechanism.   The power tool according to claim 9, wherein the spring constant of the first vibration reduction mechanism is larger than the spring constant of the second vibration reduction mechanism.

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