Work machine and vibration isolation member

Abstract

The invention relates to a working machine and a vibration isolation member which can reduce discomfort brought to a user. A work machine is provided with: a first work machine part including a work mechanism driven by a prime mover; a second work machine part including a handle that can be gripped by a user; and a vibration-damping member disposed between the first work machine part and the second work machine part. A first attachment member is provided to one of the first work machine part and the second work machine part. A second attachment member is provided to the other of the first work machine part and the second work machine part. The vibration isolation member includes: a first attachment part attached to the first attachment member; a second attachment part that is provided at a position shifted in the first direction when viewed from the first attachment part, and that is attached to a second attachment member; a first connecting part connecting the first mounting part and the second mounting part; and a first groove formed by recessing a portion of the outer surface of the vibration isolation member corresponding to the outer surface of the first connection portion in a direction orthogonal to the first direction.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a working machine and a vibration isolating member. Background Art

[0002] Patent document 1 discloses a working machine, which includes: a first working machine part, which includes a working mechanism driven by a prime mover; a second working machine part, which includes a handle that can be held by a user; and a vibration isolation member, which is arranged between the first working machine part and the second working machine part. A first mounting component is provided on one of the first working machine part and the second working machine part. A second mounting component is provided on the other of the first working machine part and the second working machine part. The vibration isolation member includes a first mounting portion mounted on the first mounting component, a second mounting portion mounted on the second mounting component, and a first connecting portion connecting the first mounting portion and the second mounting portion. When the first working machine part vibrates with the operation of the working mechanism, the vibration transmitted from the first working machine part to the second working machine part is reduced by shear deformation of the vibration isolation member.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2014-018183 Summary of the invention

[0006] Problem that the invention aims to solve

[0007] The first mounting portion and the second mounting portion are mounted (i.e., constrained) on the first mounting member and the second mounting member, respectively. Therefore, when the first working machine part vibrates, the first connection portion, which is neither constrained by the first mounting member nor by the second mounting member, mainly undergoes shear deformation. If the first connection portion is configured to be difficult to shear deform, there is a possibility that the vibration transmitted from the first working machine part to the second working machine part cannot be sufficiently reduced, resulting in a larger vibration transmitted to the handle. If the vibration transmitted to the handle is large, there is a concern that the user holding the handle may feel uncomfortable. This specification provides a technology that can reduce the discomfort caused to the user.

[0008] Solutions for solving problems

[0009] The working machine disclosed in this specification includes: a first working machine part, which includes a working mechanism driven by a prime mover; a second working machine part, which includes a handle that can be held by a user; and a vibration isolation member, which is arranged between the first working machine part and the second working machine part. A first mounting component is provided on one of the first working machine part and the second working machine part. A second mounting component is provided on the other of the first working machine part and the second working machine part. The vibration isolation member includes: a first mounting portion, which is mounted on the first mounting member; a second mounting portion, which is provided at a position offset in a first direction when viewed from the first mounting portion and is mounted on the second mounting member; a first connecting portion, which connects the first mounting portion and the second mounting portion; and a first groove, which is formed by making a portion of the outer surface of the vibration isolation member corresponding to the outer surface of the first connecting portion concave in a direction orthogonal to the first direction.

[0010] The vibration isolation member disclosed in the present specification is arranged between the first working machine part and the second working machine part in a working machine including a first working machine part and a second working machine part, wherein the first working machine part includes a working mechanism driven by a prime mover, and the second working machine part includes a handle that can be held by a user. A first mounting component is provided on one of the first working machine part and the second working machine part. A second mounting component is provided on the other of the first working machine part and the second working machine part. The vibration isolation member includes: a first mounting portion, which is mounted on the first mounting component; a second mounting portion, which is provided at a position offset in a first direction when viewed from the first mounting portion and is mounted on the second mounting component; a first connecting portion, which connects the first mounting portion and the second mounting portion; and a first groove, which is formed by making a portion of the outer surface of the vibration isolation member corresponding to the outer surface of the first connecting portion concave in a direction orthogonal to the first direction.

[0011] With the above-mentioned structure, the first groove is provided, so that the cross-sectional area of ​​the first connecting portion in the cross section perpendicular to the first direction is reduced. As a result, the shear stiffness of the first connecting portion in the direction perpendicular to the first direction is reduced, so that the first connecting portion is easily shear-deformed in the direction perpendicular to the first direction. Therefore, if the vibration isolation member is configured so that the direction in which the first working machine part vibrates and the first direction are orthogonal to each other, the first connecting portion is shear-deformed to a large extent when the first working machine part vibrates, thereby greatly reducing the vibration transmitted from the first working machine part to the second working machine part. Therefore, with the above-mentioned structure, since the vibration transmitted to the handle can be reduced, the discomfort caused to the user can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a diagram showing a state in which the rear housing 12 of the hedge trimmer 2 of the embodiment is in a normal position, as viewed from the upper right front.

[0013] Figure 2 This is a diagram showing the internal structure of the hedge trimmer 2 according to the embodiment as viewed from the right.

[0014] Figure 3 This is a diagram showing the internal structure of the rear housing 12 of the hedge trimmer 2 according to the embodiment as viewed from the upper left rear side.

[0015] Figure 4 This is a diagram showing the internal structure of the rear housing 12 of the hedge trimmer 2 according to the embodiment as viewed from the upper left rear side.

[0016] Figure 5 This is a diagram showing a state in which the rear housing 12 of the hedge trimmer 2 of the embodiment is in a rotated position, as viewed from the upper right front.

[0017] Figure 6 1 is an exploded view of the front portion of the hedge trimmer 2 of the embodiment.

[0018] Figure 7 It is a perspective view of the vibration-isolating members 90a, 90b, and 90c of the embodiment.

[0019] Figure 8 1 and 2 are side views of vibration-isolating members 90a, 90b, and 90c according to the embodiment.

[0020] Fig. 9 It is a perspective view of the vibration-isolating members 90a, 90b, and 90c of the embodiment.

[0021] Fig.10 1 is a perspective cross-sectional view of vibration-isolating members 90 a , 90 b , and 90 c according to the embodiment.

[0022] Fig.11 1 and 2 are diagrams showing a vibration-isolating member 90 a , a first mounting member 128 , a second mounting member 134 , and a third mounting member 140 according to the embodiment.

[0023] Fig.12 The diagram shows a state where the vibration-damping member 90 a according to the embodiment is mounted on the first mounting member 128 , the second mounting member 134 , and the third mounting member 140 .

[0024] Fig.13 1 and 2 are diagrams showing a vibration-isolating member 90 b , a first mounting member 146 , a second mounting member 152 , and a third mounting member 158 according to the embodiment.

[0025] Fig.14 1 and 2 are diagrams showing a vibration-isolating member 90 c , a first mounting member 164 , a second mounting member 168 , and a third mounting member 174 according to the embodiment.

[0026] Fig.15 The diagram shows a state where the vibration-damping member 90 c according to the embodiment is mounted on the first mounting member 164 , the second mounting member 168 , and the third mounting member 174 .

[0027] Fig.16a So Figure 8 FIG. 1 is a diagram showing the vibration-isolating members 90 a , 90 b , and 90 c of the embodiment as viewed from the cross section AA in FIG.

[0028] Fig.16b So Figure 8 The vibration-isolating members 90a, 90b, and 90c of the embodiment are viewed from the cross section BB in FIG.

[0029] Fig.16c So Figure 8 The vibration-isolating members 90a, 90b, and 90c of the embodiment are viewed from the cross section CC in FIG.

[0030] Fig.16d So Figure 8 The vibration-isolating members 90a, 90b, and 90c of the embodiment are viewed from the cross section DD in FIG.

[0031] Fig.16e So Figure 8 The cross section EE in FIG. 1 is a diagram showing the vibration-isolating members 90 a , 90 b , and 90 c of the embodiment.

[0032] Fig.16f So Figure 8 The cross section FF in FIG. 1 is a diagram showing the vibration-isolating members 90 a , 90 b , and 90 c of the embodiment.

[0033] Fig.17 The diagram shows a state where the motor case 22 of the hedge trimmer 2 according to the embodiment is disassembled.

[0034] Fig.18 It is an enlarged cross-sectional view showing a cooling air flow path F of the hedge trimmer 2 according to the embodiment.

[0035] Fig.19 1 is a diagram showing the positional relationship between the air supply port 188 of the motor case 22 and the air exhaust port 196 of the rear case 12 inside the passage portion 192 of the hedge trimmer 2 according to the embodiment.

[0036] Fig. 20 This is a diagram of the battery pack B in a state where the rear case 12 of the embodiment and the battery mounting portion 38 mounted on the rear case 12 are viewed from the axial direction of the rotation axis RA.

[0037] Fig.21 It is a perspective view of vibration-isolating members 90a, 90b, and 90c according to a modified example. DETAILED DESCRIPTION

[0038] Representative and non-limiting specific examples of the present invention are described in detail below with reference to the accompanying drawings. This detailed description is intended to simply show the details of the preferred examples for implementing the present invention to those skilled in the art, and is not intended to limit the scope of the present invention. In addition, in order to provide further improved working machinery and vibration isolation components, the disclosed additional features and technical solutions can be used independently of other features and technical solutions, or used together with other features and technical solutions.

[0039] In addition, the combination of features and processes disclosed in the following detailed description is not necessary for implementing the present invention in the broadest sense, but is recorded only for the purpose of particularly illustrating the representative specific examples of the present invention. Furthermore, in providing additional and useful embodiments of the present invention, the various features of the following representative specific examples and the various features recorded in the claims do not necessarily have to be combined like the specific examples recorded here or in the order of enumeration.

[0040] All features described in this specification and / or claims are intended to be disclosed separately and independently of each other as limitations on the disclosure of the original application and specific matters described in the claims, with respect to the structures of the features described in the embodiments and / or claims. Furthermore, all numerical ranges and records related to organizations or groups are intended to be disclosed as limitations on the disclosure of the original application and specific matters described in the claims with the intention of disclosing the intermediate structures thereof.

[0041] In one or more embodiments, a hollow space may be formed inside the first connecting portion.

[0042] With the above structure, the hollow space is provided, so that the cross-sectional area of ​​the first connecting portion in the cross section perpendicular to the first direction is further reduced. As a result, the shear rigidity of the first connecting portion in the direction perpendicular to the first direction is further reduced, so that the first connecting portion is more easily shear-deformed in the direction perpendicular to the first direction. As a result, when the first working machine part vibrates in the direction perpendicular to the first direction, the vibration transmitted from the first working machine part to the second working machine part is further reduced.

[0043] In one or more embodiments, the first mounting component may include a first mounting protrusion protruding toward the first direction. Alternatively, the first mounting portion may include a first mounting hole for the first mounting protrusion to enter, and the first mounting hole is formed by recessing the outer surface of the vibration isolation member toward the first direction.

[0044] According to the above structure, the first mounting protrusion enters the first mounting hole, so that the first mounting portion is restrained by the first mounting member in a direction perpendicular to the first direction. Thus, the first mounting portion can be easily positioned relative to the first mounting member.

[0045] In one or more embodiments, a hollow space may be formed inside the first connection portion, and the first mounting hole may be connected to the hollow space.

[0046] According to the above structure, when the vibration-isolating member is manufactured by injection molding, the first mounting hole and the hollow space can be formed using the same mold. This makes it easier to manufacture the vibration-isolating member.

[0047] In one or more embodiments, the second mounting component may include a mounting frame protruding in a second direction orthogonal to the first direction. Alternatively, the second mounting portion may include a mounting recess for the mounting frame to enter, the mounting recess being formed by recessing the outer surface of the vibration isolating member in the second direction.

[0048] According to the above structure, the second mounting portion is restrained by the second mounting member in the direction perpendicular to the second direction by the mounting frame entering the mounting recess. Thus, the second mounting portion can be easily positioned relative to the second mounting member.

[0049] In one or more embodiments, the second mounting component may include a second mounting protrusion protruding from the outer surface of the mounting frame toward a third direction opposite to the first direction. Alternatively, the second mounting portion may include a second mounting hole for the second mounting protrusion to enter, and the second mounting hole is formed by recessing the wall surface of the mounting recess toward the third direction.

[0050] With the above structure, when the mounting frame is about to be disengaged from the mounting recess, the second mounting protrusion will be caught in the second mounting hole. Thus, the mounting frame can be prevented from being disengaged from the mounting recess, thereby preventing the vibration isolating member from being disengaged from the second mounting component.

[0051] In one or more embodiments, a hollow space may be formed inside the first connection portion, and the second mounting hole may be connected to the hollow space.

[0052] According to the above structure, when the vibration-isolating member is manufactured by injection molding, the second mounting hole and the hollow space can be formed using the same mold. Thus, the vibration-isolating member can be manufactured more easily.

[0053] In one or more embodiments, one of the first working machine part and the second working machine part may be provided with a third mounting part in addition to the first mounting part. Alternatively, the vibration isolation member may further include: a third mounting part, which is provided at a position offset in the first direction when viewed from the second mounting part and is mounted on the third mounting part; a second connecting part, which connects the second mounting part and the third mounting part; and a second groove, which is formed by making a portion of the outer surface of the vibration isolation member corresponding to the outer surface of the second connecting part concave in a direction orthogonal to the first direction.

[0054] With the above-mentioned structure, another mounting component (third mounting component) is provided on one of the first working machine part and the second working machine part. In addition, the vibration isolation member is mounted on the third mounting component by means of another mounting portion (third mounting portion). Thus, the vibration isolation member can be relatively firmly mounted on one of the first working machine part and the second working machine part. In this structure, the vibration of the first working machine part is transmitted to the second working machine part not only via the first mounting component, the first mounting portion, the first connecting portion, the second mounting portion and the second mounting component, but also via the third mounting component, the third mounting portion, the second connecting portion, the second mounting portion and the second mounting component. Therefore, if the second connecting portion is formed to be difficult to shear and deform, the vibration transmitted from the first working machine part to the second working machine part cannot be sufficiently reduced. In contrast, with the above-mentioned structure, by providing the second groove, the cross-sectional area of ​​the second connecting portion in the cross section orthogonal to the first direction is reduced. As a result, the shear rigidity of the second connection portion in the direction perpendicular to the first direction is reduced, so the second connection portion is easily shear-deformed in the direction perpendicular to the first direction. Therefore, if the vibration isolation member is arranged so that the direction in which the first working machine portion vibrates and the first direction are perpendicular to each other, the second connection portion is shear-deformed to a large extent when the first working machine portion vibrates, so that the vibration transmitted from the first working machine portion to the second working machine portion can be sufficiently reduced.

[0055] In one or more embodiments, the working mechanism may include a pair of blades that are driven by the prime mover to reciprocate relative to each other. The vibration isolating member may be arranged so that the first direction is orthogonal to the reciprocating direction of the pair of blades.

[0056] The above-mentioned vibration isolation component exerts a significant vibration isolation effect on the vibration of the first working machine part in the direction orthogonal to the first direction. Therefore, if the reciprocating direction of the pair of blades is not a direction orthogonal to the first direction, there is a concern that the vibration accompanying the reciprocating motion of the pair of blades cannot be sufficiently reduced and transmitted to the handle. As a result, there is a concern that it will cause discomfort to the user holding the handle. With the above-mentioned structure, since the reciprocating direction of the pair of blades becomes a direction orthogonal to the first direction, the vibration accompanying the reciprocating motion of the pair of blades is transmitted to the handle on the basis of being sufficiently reduced by the vibration isolation component. Thereby, the discomfort caused to the user holding the handle can be reduced.

[0057] (Example: Hedge Trimmer 2)

[0058] like Figure 1 As shown, the working machine of this embodiment is a hedge trimmer 2. The hedge trimmer 2 is a gardening tool mainly used for trimming hedges and trees. The hedge trimmer 2 includes a working unit 4, a base 6 supporting the working unit 4, a front handle 8 provided on the base 6, a hand guard 10 for protecting the user's hand holding the front handle 8, a rear housing 12 installed at the rear of the base 6, and a rear handle 14 provided on the rear housing 12.

[0059] The operation unit 4 includes a pair of shear blades 16. The pair of shear blades 16 extend in a straight line and have a plurality of blades 18 along the length direction thereof. The pair of shear blades 16 trim hedges and trees using the plurality of blades 18 by reciprocating with each other. In the present embodiment, in the length direction of the pair of shear blades 16, the direction from the base 6 toward the pair of shear blades 16 is set as the front direction, and the direction from the pair of shear blades 16 toward the base 6 is set as the rear direction. In addition, the direction orthogonal to the front-back direction and parallel to the plane in which the plurality of blades 18 of the pair of shear blades 16 extend is set as the left-right direction. In addition, in the direction orthogonal to the front-back direction and the left-right direction, the direction from the pair of shear blades 16 toward the hand guard 10 is set as the upper direction, and the direction from the hand guard 10 toward the pair of shear blades 16 is set as the lower direction.

[0060] The front handle 8 is provided at the front of the base 6 and has a generally U-shaped shape that is open downward. The front handle 8 extends to the left, top, and right of the base 6. The outer surface of the front handle 8 has a generally cylindrical shape. In addition, the rear handle 14 is provided at the upper portion of the rear housing 12 and extends linearly along the front-to-back direction. The outer surface of the rear housing 12 has a generally cylindrical shape. The user can carry the hedge trimmer 2 by holding the front handle 8 with one hand and the rear handle 14 with the other hand.

[0061] like Figure 2As shown, the operation unit 4 further includes an electric motor 20, a motor housing 22, a power transmission mechanism 24, and a mechanism housing 26. The electric motor 20 is, for example, an inner rotor type brushless motor including a stator 28, a rotor 30 disposed inside the stator 28, and an output shaft 32 fixed to the rotor 30. The electric motor 20 is housed in the motor housing 22. The motor housing 22 is fixed to the upper part of the mechanism housing 26. The output shaft 32 of the electric motor 20 is rotatably held in the motor housing 22 by a bearing 34, and is rotatably held in the mechanism housing 26 by a bearing 36. The output shaft 32 extends in the up-down direction and spans between the motor housing 22 and the mechanism housing 26. The mechanism housing 26 houses the power transmission mechanism 24 and supports a pair of shear blades 16. The output shaft 32 of the electric motor 20 is connected to the pair of shear blades 16 by the power transmission mechanism 24. The power transmission mechanism 24 is, for example, a crank cam, and converts the rotational motion of the output shaft 32 into the reciprocating motion of each of the pair of shear blades 16. The reciprocating directions of the pair of shear blades 16 are respectively along the front-rear direction.

[0062] A battery mounting portion 38 for detachably mounting the battery pack B is provided at the rear portion of the rear housing 12. The battery pack B is mounted on the battery mounting portion 38 by sliding in a sliding direction SD from the upper rear portion toward the lower front portion relative to the battery mounting portion 38. When the clockwise direction when viewed from the right is assumed to be positive, the inclination angle θ1 of the sliding direction SD relative to the front-rear direction is, for example, in the range of 45 to 90 degrees, and is 60 degrees in the present embodiment.

[0063] A control device 40 for controlling various parts of the hedge trimmer 2 is housed at the lower part of the rear housing 12. The control device 40 includes a control substrate 42 and a controller housing 44 that houses the control substrate 42. The control substrate 42 is equipped with, for example, a microcomputer composed of a CPU, a ROM, and a RAM, and an inverter circuit composed of a plurality of switching elements (for example, FETs). The control device 40 can, for example, convert the direct current supplied from the battery pack B into three-phase alternating current and supply it to the electric motor 20. In addition, the control device 40 has a substantially flat plate shape extending in the left-right direction. The control device 40 is arranged in such a manner that the longitudinal direction is along the front-back direction.

[0064] The rear housing 12 includes a shaft portion 46 having a substantially cylindrical shape. The shaft portion 46 is provided at the front portion of the rear housing 12. In addition, the base 6 includes a shaft retaining portion 48 that retains the shaft portion 46 so as to be rotatable about the rotation axis RA. The shaft retaining portion 48 is provided at the rear portion of the base 6. The rotation axis RA is located on a plane orthogonal to the left-right direction, and is inclined from the top to the bottom as it moves from the rear to the front. When the clockwise direction when viewed from the right is set to be positive, the inclination angle θ2 of the rotation axis RA relative to the front-to-back direction is, for example, in the range of 0 to 30 degrees, and is 10 degrees in the present embodiment. In addition, the rotation axis RA extends in a manner that passes through the battery pack B mounted on the battery mounting portion 38. That is, the battery pack B mounted on the battery mounting portion 38 is arranged on the rotation axis RA.

[0065] like Figure 3 As shown, the shaft holding portion 48 includes a cylindrical surface 50 for holding the outer peripheral surface of the shaft portion 46 in a manner that allows the shaft portion 46 to rotate, and a cylindrical surface 50 for facing the rotation axis RA (see Figure 2 ) is recessed radially outwardly of the rear housing 12 to form a plurality of engaging grooves 52 (some engaging grooves 52 are not shown in the figure). In the present embodiment, five engaging grooves 52 are provided. The plurality of engaging grooves 52 extend along the rotation axis RA, respectively. The plurality of engaging grooves 52 are arranged at predetermined intervals (for example, intervals of 1 / 8 of a circle) in the circumferential direction of the rotation axis RA. In addition, a rotation locking member 54 is provided on the rear housing 12 to lock the rotation of the shaft portion 46 relative to the base 6 (that is, the rotation of the rear housing 12 relative to the base 6). The rotation locking member 54 includes a locking piece 56 extending along the rotation axis RA. A receiving groove 58 is formed on the shaft portion 46, which is recessed radially inwardly from the outer peripheral surface of the shaft portion 46 and can accommodate the locking piece 56. The receiving groove 58 extends along the rotation axis RA. When the receiving groove 58 and the engaging groove 52 are opposite to each other in the radial direction of the rotation axis RA, the rotation locking member 54 can be rotated in a manner such as Figure 3 As shown, the locking piece 56 enters the locking position of the engaging groove 52 and Figure 4 As shown, the locking piece 56 enters the unlocking position of the receiving groove 58 and slides. An operating portion 60 is fixed to the rotation locking member 54. Figure 1 and Figure 5 As shown in FIG. 1 , the operation portion 60 is exposed on the left and right outer surfaces of the rear housing 12 and can slide along the outer surface of the rear housing 12. The user can slide the rotation locking member 54 by operating the operation portion 60. Figure 3 and Figure 4 As shown in FIG. 1 , a coil spring 62 is mounted on the rotation locking member 54. The lower end of the coil spring 62 is in contact with a support protrusion 63 (see FIG. 1 ) formed on the inner wall of the rear housing 12. Figure 2) abuts. The coil spring 62 urges the rotation locking member 54 upward relative to the support protrusion 63. Therefore, when the user does not operate the operating portion 60, the rotation locking member 54 is held in place by the urging force of the coil spring 62. Figure 3 When the rotation locking member 54 is in the locked position, the rear housing 12 is mechanically locked relative to the base 6, thereby prohibiting the rear housing 12 from rotating relative to the base 6. When the user overcomes the force of the coil spring 62 and presses the operating portion 60 from this state, the rotation locking member 54 is rotated to Figure 4 When the rotation locking member 54 is in the unlocked position, the rear housing 12 is unlocked relative to the base 6, thereby allowing the rear housing 12 to rotate relative to the base 6.

[0066] The user rotates the rear housing 12 while moving the rotation lock member 54 to the unlocked position, so that the locking piece 56 engages with the other engagement groove 52, thereby changing the position of the rear housing 12 relative to the base 6. Figure 1 The usual position shown is changed to Figure 5 In the following, unless otherwise specified, the rear housing 12 is in the rotational position shown. Figure 1 Usual position shown.

[0067] like Figure 3 As shown, the rear housing 12 is provided with an operation button 64, a trigger lever 66 and a locking lever 68. The operation button 64 is arranged on the upper surface of the rear handle 14. The user can switch the main power of the hedge trimmer 2 on / off, change the rotation speed of the electric motor 20, drive the electric motor 20 in reverse, etc. by operating the operation button 64. The trigger lever 66 is arranged at the lower part of the rear handle 14 and is at a position that can be operated by the index finger of the hand holding the rear handle 14. In addition, the locking lever 68 is arranged at the upper part of the rear handle 14 and is at a position that can be operated by the palm of the hand holding the rear handle 14. The trigger lever 66 is usually mechanically locked by the locking lever 68. When the locking lever 68 is pushed in, the lock of the trigger lever 66 is released, thereby allowing the trigger lever 66 to be pulled up. When the trigger lever 66 is pulled up, the micro switch 70 stored in the interior of the rear housing 12 is pressed. When the micro switch 70 is pressed while the main power of the hedge trimmer 2 is turned on, the control device 40 operates the electric motor 20 to drive the pair of shear blades 16. When the pulling operation of the trigger lever 66 is released from this state, the micro switch 70 is no longer pressed. When the micro switch 70 is not pressed, the control device 40 stops the electric motor 20 to stop the pair of shear blades 16. Therefore, when the user pushes the lock lever 68 in and pulls up the trigger lever 66 while the main power of the hedge trimmer 2 is turned on, the pair of shear blades 16 can be driven.

[0068] The rotation locking member 54 is connected to a sliding member 540, which is held by the rear housing 12 so as to be able to slide in the front-rear direction. The rotation locking member 54 and the sliding member 540 are connected by inserting a pin 542 formed on the rotation locking member 54 into a long hole 544 formed on the sliding member 540. When the rotation locking member 54 slides, the pin 542 moves along the long hole 544, and the sliding member 540 slides. In addition, the sliding member 540 includes a notch groove 546 formed by partially missing the rear portion of the sliding member 540. A protrusion 548 that can enter the notch groove 546 is formed on the trigger lever 66. Figure 3 As shown, when the rotation locking member 54 is in the locked position, the slide 540 is in a position that does not mechanically interfere with the trigger rod 66. Figure 4 As shown in FIG. 5 , when the rotation locking member 54 moves to the unlocking position, the slide 540 moves rearward, and the protrusion 548 formed on the trigger lever 66 enters the notch groove 546. Thus, the trigger lever 66 is mechanically locked. According to the above structure, when the user changes the position of the rear housing 12 relative to the base 6, the trigger lever 66 cannot be operated, thereby prohibiting the driving of the pair of shear blades 16.

[0069] like Figure 6 As shown, the base 6 includes a base body 72, a handle member 74, a semi-cylindrical member 76 and a plate member 78. The base body 72, the handle member 74, the semi-cylindrical member 76 and the plate member 78 are fixed to each other by screws (not shown). The handle member 74 is a member that defines the front handle 8 and the hand guard 10. In addition, the base 6 includes a left side support portion 80 that supports the left part of the mechanism housing 26 via a vibration isolation member 90a, a right side support portion 82 that supports the right part of the mechanism housing 26 via a vibration isolation member 90b, a rear side support portion 84 that supports the rear part of the mechanism housing 26 via a vibration isolation member 90c, a left side arm portion 86 that passes through the left side of the mechanism housing 26 to connect the left side support portion 80 and the rear side support portion 84, and a right side arm portion 88 that passes through the right side of the mechanism housing 26 to connect the right side support portion 82 and the rear side support portion 84.

[0070] (Vibration Isolation Members 90a, 90b, 90c)

[0071] like Figure 7As shown, the vibration isolation members 90a, 90b, 90c have a substantially rectangular parallelepiped shape. The vibration isolation members 90a, 90b, 90c use a rubber material (e.g., silicone rubber). The vibration isolation members 90a, 90b, 90c are manufactured, for example, by injection molding. In the present embodiment, the length direction, width direction, and height direction of the vibration isolation members 90a, 90b, 90c are defined as the X direction, the Y direction, and the Z direction. The dimension of the vibration isolation members 90a, 90b, 90c in the X direction is, for example, in the range of 20 mm to 70 mm, and is 50 mm in the present embodiment. The dimension of the vibration isolation members 90a, 90b, 90c in the Y direction is, for example, in the range of 10 mm to 30 mm, and is 15 mm in the present embodiment. The dimension of the vibration isolation members 90a, 90b, 90c in the Z direction is, for example, in the range of 10 mm to 40 mm, and is 25 mm in the present embodiment. The vibration isolating members 90a, 90b, and 90c are symmetrical with respect to the X direction and the Z direction. Therefore, the following description of the vibration isolating members 90a, 90b, and 90c holds true even if the positive and negative signs in the X direction are reversed, and holds true even if the positive and negative signs in the Z direction are reversed.

[0072] The vibration-isolating members 90a, 90b, and 90c include common components. Therefore, the components included in the vibration-isolating members 90a, 90b, and 90c are described below with common reference numerals being given.

[0073] like Figure 8 As shown in FIG. 1 , the vibration isolating members 90a, 90b, and 90c include a first mounting portion 92, a second mounting portion 94 located at a position offset in the negative direction of the Z direction when viewed from the first mounting portion 92, a third mounting portion 96 located at a position offset in the negative direction of the Z direction when viewed from the second mounting portion 94, a first connecting portion 98 connecting the first mounting portion 92 and the second mounting portion 94, and a second connecting portion 100 connecting the first mounting portion 92 and the third mounting portion 96. A first groove 102 is formed in a portion of the outer surface of the vibration isolating members 90a, 90b, and 90c corresponding to the outer surface of the first connecting portion 98. In addition, a second groove 104 is formed in a portion of the outer surface of the vibration isolating members 90a, 90b, and 90c corresponding to the outer surface of the second connecting portion 100. The first groove 102 and the second groove 104 extend over the entire circumference of the vibration isolating members 90a, 90b, and 90c in the XY plane.

[0074] like Figure 7 As shown, the first mounting portion 92 has a plate shape extending along the XY plane. The first mounting portion 92 includes a mounting surface 106 facing the positive direction of the Z direction and a plurality of mounting holes 108 formed by recessing the mounting surface 106 toward the negative direction of the Z direction. The plurality of mounting holes 108 are long holes having a length direction in the X direction.

[0075] The second mounting portion 94 has a substantially rectangular parallelepiped shape with the length direction being the X direction, the width direction being the Y direction, and the height direction being the Z direction. The second mounting portion 94 includes an end surface 110 facing the positive direction of the Y direction, a mounting recess 112 formed by recessing the end surface 110 in the negative direction of the Y direction, a plurality of mounting holes 114 formed by recessing the wall surface of the mounting recess 112 in the negative direction of the Z direction, and a plurality of mounting holes 116 formed by recessing the wall surface of the mounting recess 112 in the positive direction of the Z direction (see FIG. Fig. 9 ), and a plurality of weight-reducing holes 118 formed by penetrating the bottom surface of the mounting recess 112 in the negative direction of the Y direction. Fig.10 As shown, the plurality of mounting holes 116 are connected to the plurality of mounting holes 108 of the first mounting portion 92 respectively by means of the hollow space 120 formed inside the first connecting portion 98. In this embodiment, the wall surface defining the plurality of mounting holes 116, the wall surface defining the hollow space 120, and the wall surface defining the plurality of mounting holes 108 are smoothly connected.

[0076] like Fig. 9 As shown, the third mounting portion 96 has a plate shape extending along the XY plane similarly to the first mounting portion 92. The third mounting portion 96 includes a mounting surface 122 facing the negative direction of the Z direction and a plurality of mounting holes 124 formed by making the mounting surface 122 recessed in the positive direction of the Z direction. The plurality of mounting holes 124 are long holes having a length direction in the X direction. Fig.10 As shown, the plurality of mounting holes 124 are connected to the plurality of mounting holes 114 of the second mounting portion 94 by means of a hollow space 126 formed inside the second connecting portion 100. In this embodiment, the wall surface defining the plurality of mounting holes 124, the wall surface defining the hollow space 126, and the wall surface defining the plurality of mounting holes 114 are smoothly connected.

[0077] like Fig.11 As shown, the vibration isolation member 90a is arranged in such a manner that the positive direction in the X direction is the front direction, the positive direction in the Y direction is the right direction, and the positive direction in the Z direction is the upward direction. The first mounting portion 92 is mounted on a first mounting component 128 provided on the left portion of the handle member 74. The first mounting component 128 includes a support surface 130 facing downward (in the negative direction in the Z direction) and a plurality of mounting protrusions 132 protruding downward (in the negative direction in the Z direction) from the support surface 130. The plurality of mounting protrusions 132 each have a shape that can be engaged with the plurality of mounting holes 108. As shown in FIG. Fig.12 As shown, the first mounting portion 92 is mounted on the first mounting member 128 by fitting the plurality of mounting protrusions 132 into the plurality of mounting holes 108 and bringing the mounting surface 106 into contact with the support surface 130 . Fig.11 The second mounting portion 94 shown is mounted on the mechanism housing 26 (see Figure 6) is provided on the left side of the mechanism housing 26. The second mounting member 134 includes a mounting frame 136 protruding from the outer surface of the mechanism housing 26 toward the left (negative direction in the Y direction) and a plurality of mounting protrusions 138 protruding from the upper surface of the mounting frame 136 toward the top (positive direction in the Z direction). The mounting frame 136 has a shape that can be fitted into the mounting recess 112. In addition, the plurality of mounting protrusions 138 each have a shape that can be fitted into the plurality of mounting holes 116 (see Fig. 9 ) in a chimeric shape. Fig.12 As shown, the second mounting portion 94 is mounted to the second mounting member 134 by fitting the mounting frame 136 into the mounting recess 112 and fitting the plurality of mounting protrusions 138 into the plurality of mounting holes 116 . Fig.11 The third mounting portion 96 shown is mounted on a third mounting member 140 provided on the left arm portion 86. The third mounting member 140 includes a support surface 142 facing upward (in the positive direction of the Z direction) and a plurality of mounting protrusions 144 protruding upward (in the positive direction of the Z direction) from the support surface 142. The plurality of mounting protrusions 144 each have a plurality of mounting holes 124 (see Fig. 9 ) in a chimeric shape. Fig.12 As shown, the third mounting portion 96 is mounted on the third mounting member 140 by fitting the plurality of mounting protrusions 144 into the plurality of mounting holes 124 and bringing the mounting surface 122 into contact with the support surface 142. The vibration isolating member 90a is normally sandwiched between the base body 72 and the handle member 74 and compressed in the vertical direction (Z direction).

[0078] like Fig.13 As shown, the vibration isolation member 90b is arranged in such a manner that the positive direction in the X direction is the rear direction, the positive direction in the Y direction is the left direction, and the positive direction in the Z direction is the upward direction. The first mounting portion 92 is mounted on the first mounting component 146 provided on the right part of the handle member 74. The first mounting component 146 includes a support surface 148 and a plurality of mounting protrusions 150. In addition, the second mounting portion 94 is mounted on the mechanism housing 26 (refer to Figure 6 ). The second mounting component 152 includes a mounting frame 154 and a plurality of mounting protrusions 156. In addition, the third mounting portion 96 is mounted on a third mounting component 158 ​​provided on the right arm portion 88. The third mounting component 158 ​​includes a supporting surface 160 and a plurality of mounting protrusions 162. The first mounting component 146, the second mounting component 152 and the third mounting component 158 ​​have substantially the same shape as the aforementioned first mounting component 128, the second mounting component 134 and the third mounting component 140. Therefore, a detailed description of the first mounting component 146, the second mounting component 152 and the third mounting component 158 ​​is omitted. The vibration isolation member 90b is usually sandwiched between the base body 72 and the handle member 74 and compressed in the up-down direction (Z direction).

[0079] like Fig.14 As shown, the vibration isolation member 90c is arranged in such a manner that the positive direction of the X direction is the left direction, the positive direction of the Y direction is the front direction, and the positive direction of the Z direction is the upward direction. The first mounting portion 92 is mounted on the first mounting component 164 provided on the plate member 78. The first mounting component 164 includes a support surface 166 (i.e., the lower surface of the plate member 78). The first mounting component 164 is different from the aforementioned first mounting components 128 and 146, and does not include such a protrusion that enters into the plurality of mounting holes 108 of the first mounting portion 92. Fig.15 As shown, the first mounting portion 92 is mounted on the first mounting member 164 by making the mounting surface 106 abut against the support surface 166. In addition, the second mounting portion 94 is mounted on the mechanism housing 26 (see Figure 6 ). The second mounting component 168 includes a mounting frame 170 and a plurality of mounting protrusions 172. The third mounting portion 96 is mounted on a third mounting component 174 provided at the rear of the base body 72. The third mounting component 174 includes a supporting surface 176 and a plurality of mounting protrusions 178. The second mounting component 168 and the third mounting component 174 have substantially the same shape as the aforementioned second mounting components 134, 152 and the third mounting components 140, 158. Therefore, detailed description of the second mounting component 168 and the third mounting component 174 is omitted. The vibration isolation member 90c is usually sandwiched between the base body 72 and the plate member 78 and compressed in the up and down direction (Z direction).

[0080] Figure 8 The first vibration isolation region A1 shown is a region located on the negative side in the Z direction relative to the mounting surface 106 and on the positive side in the Z direction relative to the wall surface on the positive side in the Z direction of the mounting recess 112. Figure 6 ) and the second mounting member 134, 152, 168 (refer to Figure 6 ) is mainly transmitted to the other of the first mounting member 128, 146, 164 and the second mounting member 134, 152, 168 via the first vibration isolation area A1. The second vibration isolation area A2 is an area located on the positive side in the Z direction relative to the mounting surface 122 and on the negative side in the Z direction relative to the wall surface on the negative side in the Z direction of the mounting recess 112. The second mounting member 134, 152, 168 and the third mounting member 140, 158, 174 (see Figure 6 ) is mainly transmitted to the other of the second mounting components 134, 152, 168 and the third mounting components 140, 158, 174 via the second vibration isolation area A2.

[0081] Fig.16aThe illustrated cross section AA is a cross section perpendicular to the Z direction of a portion of the first vibration isolation region A1 corresponding to the first mounting portion 92 . Fig.16b The cross section BB shown is a cross section perpendicular to the Z direction of a portion corresponding to the first connection portion 98 in the first vibration isolation area A1. Fig.16c The cross section CC shown is a cross section perpendicular to the Z direction of a portion corresponding to the second mounting portion 94 in the first vibration isolation area A1. Fig.16d The cross section DD shown is a cross section perpendicular to the Z direction of a portion corresponding to the second mounting portion 94 in the second vibration isolation area A2. Fig.16e The illustrated cross section EE is a cross section perpendicular to the Z direction of a portion corresponding to the second connection portion 100 in the second vibration isolation area A2. Fig.16f The cross section FF shown is a cross section orthogonal to the Z direction of the portion corresponding to the third mounting portion 96 in the second vibration isolation area A2. When the cross-sectional area of ​​the cross section AA is set to Sa, the cross-sectional area of ​​the cross section BB is set to Sb, the cross-sectional area of ​​the cross section CC is set to Sc, the cross-sectional area of ​​the cross section DD is set to Sd, the cross-sectional area of ​​the cross section EE is set to Se, and the cross-sectional area of ​​the cross section FF is set to Sf, in this embodiment, the magnitude relationship of Sa=Sc=Sd=Sf>Sb=Se holds. This magnitude relationship can also be regarded as the magnitude relationship of the shear stiffness in each cross section. Therefore, in the first vibration isolation area A1, the first connecting portion 98 is more susceptible to shear deformation in the X direction and the Y direction than the first mounting portion 92 and the second mounting portion 94. In the second vibration isolation area A2, the second connecting portion 100 is more susceptible to shear deformation in the X direction and the Y direction than the second mounting portion 94 and the third mounting portion 96.

[0082] exist Figure 6 When the pair of shear blades 16 shown in FIG. 1 are driven, the operation unit 4 vibrates in the front-to-back direction (the X direction when viewed from the vibration isolation members 90a and 90b, and the Y direction when viewed from the vibration isolation member 90c) as the pair of shear blades 16 reciprocate. In this case, the vibration of the operation unit 4 is sequentially transmitted through the second mounting members 134, 152, and 168, and the first vibration isolation area A1 (see FIG. 1 ) of the vibration isolation members 90a, 90b, and 90c. Figure 8 ) and the first mounting members 128, 146, 164 are transmitted to the base 6. In addition, the vibration of the operation unit 4 is sequentially transmitted through the second mounting members 134, 152, 168, the second vibration isolation area A2 of the vibration isolation members 90a, 90b, 90c (see Figure 8) and the third mounting components 140, 158, 174 are transmitted to the base 6. Among them, the first connecting portion 98 is shear-deformed to a large extent in the front-to-back direction in the first vibration isolation area A1 of the vibration isolation members 90a, 90b, 90c, and the second connecting portion 100 is shear-deformed to a large extent in the front-to-back direction in the second vibration isolation area A2 of the vibration isolation members 90a, 90b, 90c, thereby reducing the vibration transmitted to the base 6. In addition, there is no constraint caused by the recess and the protrusion between the vibration isolation member 90c and the first mounting component 164, and the force (i.e., vibration) is transmitted only by the friction between the mounting surface 106 and the supporting surface 166. Therefore, it can also be considered that the vibration is substantially isolated between the vibration isolation member 90c and the first mounting component 164.

[0083] (Cooling structure of hedge trimmer 2)

[0084] like Fig.17 As shown, the motor housing 22 is composed of a left housing member 180 and a right housing member 182. The left housing member 180 and the right housing member 182 are fixed to each other by screws (not shown). A motor support frame 184 is formed on the inner wall of the motor housing 22. The motor support frame 184 supports the electric motor 20 by abutting against the outer surface of the stator 28. The motor support frame 184 is divided into a portion formed in the left housing member 180 and a portion formed in the right housing member 182 (not shown). When the motor housing 22 is removed, the outer surface of the stator 28 is exposed to the outside of the hedge trimmer 2.

[0085] like Fig.18 As shown, the motor housing 22 includes a duct portion 186 extending rearward when viewed from the electric motor 20, an air supply port 188 formed at the rear end of the duct portion 186, an exhaust port 190L formed on the left surface of the motor housing 22, and an exhaust port 190R formed on the right surface of the motor housing 22 (see FIG. Fig.17 The air supply port 188 opens to the inside of a passage portion 192 provided in the base 6. The exhaust ports 190R and 190L open to the outside of the hedge trimmer 2, respectively.

[0086] The rear housing 12 includes a through hole 194 that passes through the interior of the shaft portion 46 and connects the interior and exterior of the rear housing 12, an exhaust port 196 that corresponds to an opening on the front side of the through hole 194, an air supply port 198L formed on the left surface of the rear housing 12, and an air supply port 198R formed on the right surface of the rear housing 12 (see FIG. Figure 1 The exhaust port 196 opens to the inside of the passage portion 192 provided in the base 6. The air supply ports 198L and 198R open to the outside of the hedge trimmer 2, respectively.

[0087] The passage portion 192 is provided in front of the shaft holding portion 48. In addition, the passage portion 192 and the shaft holding portion 48 are formed across the base body 72 and the semi-cylindrical member 76. An opening portion 200 is provided at the front end of the passage portion 192 for inserting the duct portion 186 of the motor housing 22. A gap 202 is provided between the outer surface of the duct portion 186 and the peripheral portion of the opening portion 200. If the gap 202 is not provided, the vibration of the working unit 4 will be directly transmitted to the base 6 because the motor housing 22 abuts against the semi-cylindrical member 76. By providing the gap 202, the motor housing 22 is prevented from abutting against the semi-cylindrical member 76, and the vibration of the working unit 4 is suppressed from being directly transmitted to the base 6. Among them, a dustproof member (not shown) that seals the gap 202 is provided in the gap 202. The dustproof member uses a member (such as a sponge) that has the property of not easily transmitting vibration. In this way, dust and other garbage are suppressed from entering the inside of the hedge trimmer 2 through the gap 202.

[0088] The hedge trimmer 2 includes a cooling air flow path F that reaches the outside of the hedge trimmer 2 via the air supply ports 198L and 198R of the rear housing 12, the interior of the rear housing 12, the exhaust port 196 of the rear housing 12, the interior of the passage portion 192, the air supply port 188 of the motor housing 22, the interior of the motor housing 22, and the exhaust ports 190R and 190L of the motor housing 22. In this embodiment, a fan 204 is fixed to the output shaft 32, and the fan 204 generates a flow of air along the cooling air flow path F (also referred to as "cooling air" for short). The fan 204 is arranged below the rotor 30 and is at a position overlapping with the exhaust ports 190R and 190L when viewed in the left-right direction. When the electric motor 20 is operated, the fan 204 rotates together with the output shaft 32 to generate cooling air in the cooling air flow path F.

[0089] The cooling air flow path F includes a first flow path portion F1 for air to flow from the air supply ports 198L, 198R toward the front lower portion of the rear shell 12, a second flow path portion F2 for air to flow from the front lower portion of the rear shell 12 through the through hole 194 toward the exhaust port 196, a third flow path portion F3 for air to flow from the exhaust port 196 through the interior of the passage portion 192 toward the air supply port 188, a fourth flow path portion F4 for air to flow from the air supply port 188 through the interior of the duct portion 186 toward the front, a fifth flow path portion F5 for air to flow along the rear surface of the motor support frame 184 toward the upper portion of the motor housing 22, and a sixth flow path portion F6 for air to flow from the upper portion of the motor housing 22 through between the stator 28 and the rotor 30 of the electric motor 20 and toward the exhaust ports 190R, 190L.

[0090] The control device 40 is arranged in the first flow path portion F1. The first flow path portion F1 extends along the length direction (i.e., the front-rear direction) of the control device 40. In addition, the air supply ports 198L and 198R of the rear housing 12 are arranged at a position rearward of the rear end of the control device 40. Therefore, the control device 40 can be cooled in the range from the rear end to the front end by the cooling air flowing in the first flow path portion F1.

[0091] like Fig.19 As shown, when the interior of the passage portion 192 is viewed along the front-rear direction, the air supply port 188 of the motor housing 22 and the air exhaust port 196 of the rear housing 12 overlap each other. Thus, the cooling air flows smoothly in the third flow path portion F3.

[0092] Although not shown, electrical wiring that connects the electrical components housed in the rear housing 12 and the electrical components housed in the motor housing 22 is arranged in the cooling air flow path F. For example, electrical wiring that electrically connects the control device 40 housed in the rear housing 12 and the electric motor 20 housed in the motor housing 22 is arranged in the cooling air flow path F.

[0093] exist Fig. 20 , the rear housing 12, the battery pack B in the state of being mounted on the battery mounting portion 38 of the rear housing 12, and the imaginary circle VC centered on the rotation axis RA are shown. The radius of the imaginary circle VC is, for example, in the range of 5 cm to 15 cm, and is 13 cm in the present embodiment. When viewed from the axial direction of the rotation axis RA, the rear housing 12 and the battery pack B are located inside the imaginary circle VC.

[0094] like Figure 2 As shown, the center of gravity BG of the battery pack B mounted on the battery mounting portion 38 is arranged at a position rearward of the rear end 14r of the rear handle 14. In addition, the center of gravity HG of the hedge trimmer 2 is arranged at a position rearward of the rear end 8r of the front handle 8 and forward of the front end 14f of the rear handle 14. Furthermore, the center of gravity HG of the hedge trimmer 2 is arranged inside the motor housing 22. In addition, it should be noted that the center of gravity HG represents the center of gravity of the hedge trimmer 2 in a state where the battery pack B is mounted on the battery mounting portion 38 and the rear housing 12 is in a normal position. Although not shown in the figure, even if the rear housing 12 is in a rotated position, the center of gravity of the hedge trimmer 2 in a state where the battery pack B is mounted on the battery mounting portion 38 is arranged at a position rearward of the rear end 8r of the front handle 8 and forward of the front end 14f of the rear handle 14.

[0095] (Variation Example)

[0096] The working machine may be a working machine other than the hedge trimmer 2 (eg, a reciprocating saw, a chain saw, a brush cutter). In this case, the working unit 4 may include other working mechanisms (eg, a saw blade, a saw chain, a rotary knife) instead of the pair of shear blades 16 .

[0097] The hedge trimmer 2 may be configured such that only one of the pair of shear blades 16 is reciprocated instead of each of the pair of shear blades 16 being reciprocated.

[0098] The prime mover for driving the pair of shear blades 16 may be a prime mover other than the electric motor 20 (for example, an engine including an internal combustion engine).

[0099] Instead of providing the battery mounting portion 38, a power cord for connecting to an external power source (eg, a commercial power source or a backpack power source) may be provided on the rear housing 12. In this configuration, the hedge trimmer 2 can be operated using power supplied from the external power source via the power cord.

[0100] The electric motor 20 may be a motor other than the inner rotor type brushless motor (for example, an outer rotor type brushless motor, a brushed motor, etc.).

[0101] The base 6 may be configured to accommodate the motor case 22 and the mechanism case 26. Thus, the motor case 22 and the mechanism case 26 can be hidden when viewed from the outside of the hedge trimmer 2.

[0102] (Refer to Figure 6 ) The base 6 may not include the left side support portion 80 and the left side arm portion 86. In this case, the base 6 may be a structure in which the working unit 4 is supported by the right side support portion 82 via the vibration isolation member 90b, and the working unit 4 is supported by the rear side support portion 84 via the vibration isolation member 90c. Alternatively, the base 6 may not include the right side support portion 82 and the right side arm portion 88. In this case, the base 6 may be a structure in which the working unit 4 is supported by the left side support portion 80 via the vibration isolation member 90a, and the working unit 4 is supported by the rear side support portion 84 via the vibration isolation member 90c.

[0103] (Refer to Fig.18 ) The control device 40 may not be arranged in the first flow path portion F1. For example, the control device 40 may be arranged in the second flow path portion F2. In this case, the length direction of the control device 40 may be arranged in the direction along the up-down direction. Alternatively, the control device 40 may not be arranged in the cooling air flow path F. For example, the control device 40 may be arranged in front of the battery mounting portion 38 at a position opposite to the battery mounting portion 38.

[0104] (Refer to Figure 3 ) The rear housing 12 may also be mounted on the base 6 in a manner that it cannot rotate relative to the base 6. In this case, the hedge trimmer 2 may not include components such as the rotation locking member 54, the plurality of engagement grooves 52, and the storage groove 58.

[0105] (Refer to Fig.17) A member covering the electric motor 20 (e.g., a cylindrical cover extending along the outer surface of the stator 28) may be provided between the motor housing 22 and the electric motor 20. Thus, even if the motor housing 22 is removed, the outer surface of the stator 28 is not exposed to the outside of the hedge trimmer 2.

[0106] (Refer to Figure 2 ) The shape of the rear portion of the rear housing 12 and the arrangement and shape of the battery mounting portion 38 may also be changed. Thus, the sliding direction SD of the battery pack B may be different from the direction described in the embodiment. For example, the sliding direction SD may be from the bottom to the top, from the left to the right, or from the back to the front.

[0107] (Refer to Fig. 20 ) It is also possible that, when viewed in the axial direction of the rotation axis RA, at least a portion of the rear housing 12 and the battery pack B are located outside the imaginary circle VC.

[0108] (Refer to Figure 2 ) The center of gravity BG of the battery pack B installed in the battery installation portion 38 can also be arranged at a position forward of the rear end 14r of the rear handle 14.

[0109] (Refer to Figure 2 ) The center of gravity HG of the hedge trimmer 2 may also be arranged at a position forward of the rear end 8r of the front handle 8. Alternatively, the center of gravity HG of the hedge trimmer 2 may also be arranged at a position rearward of the front end 14f of the rear handle 14.

[0110] (Refer to Figure 6 ) In view of the symmetry of the vibration isolating members 90a, 90b, 90c in the Z direction, the first mounting portion 92 may be mounted on the third mounting member 140, 158, 174, and the third mounting portion 96 may be mounted on the first mounting member 128, 146, 164. In this case, the second mounting portion 94 may be mounted on the second mounting member 134 by fitting the plurality of mounting protrusions 138 into the plurality of mounting holes 114.

[0111] like Fig.21As shown, the vibration isolating members 90a, 90b, 90c may not include the third mounting portion 96 and the second connecting portion 100. In this case as well, the working unit 4 can be held on the base 6 by mounting the first mounting portion 92 on the third mounting member 140, 158, 174 and mounting the second mounting portion 94 on the second mounting member 134, 152, 168. In addition, when the working unit 4 vibrates, the first connecting portion 98 is shear-deformed to a large extent, thereby reducing the vibration transmitted from the second mounting portion 94 to the first mounting portion 92 via the first connecting portion 98. As a result, the vibration transmitted from the working unit 4 to the front handle 8 provided on the base 6 is reduced.

[0112] (Refer to Figure 7 The shape of the vibration isolating members 90a, 90b, 90c is not limited to a rectangular parallelepiped shape. The vibration isolating members 90a, 90b, 90c may have a substantially cylindrical shape with the height direction being the Z direction, for example.

[0113] (Refer to Fig.10 ) It is also possible not to form the hollow space 120 inside the first connecting portion 98. That is, the first connecting portion 98 may also be solid. In addition, it is also possible not to form the hollow space 126 inside the second connecting portion 100. That is, the second connecting portion 100 may also be solid.

[0114] (Refer to Figure 7 ) The second mounting portion 94 may also not include multiple weight-reducing holes 118.

[0115] (Refer to Figure 7 ) The shape of the first mounting portion 92 (third mounting portion 96) may also be changed. For example, the first mounting portion 92 (third mounting portion 96) may include a protrusion protruding from the mounting surface 106 (mounting surface 122) toward the positive direction of the Z direction (negative direction of the Z direction) instead of the plurality of mounting holes 108 (plurality of mounting holes 124). In addition, the shape of the first mounting components 128, 146, 164 (third mounting components 140, 158, 174) may also be changed to match the shape of the first mounting portion 92 (third mounting portion 96). For example, in the case where the first mounting portion 92 (third mounting portion 96) includes a protrusion, the first mounting components 128, 146, 164 (third mounting components 140, 158, 174) may also include a hole or a recessed portion for receiving the protrusion.

[0116] (Refer to Figure 7 ) The shape of the second mounting portion 94 may also be changed. For example, the second mounting portion 94 may not include the plurality of mounting holes 114, 116. In addition, the second mounting components 134, 152, 168 may not include the plurality of mounting protrusions 138, 156, 172.

[0117] (Refer to Fig.10 ) The multiple mounting holes 108 and the hollow space 120, the hollow space 120 and the multiple mounting holes 116, the multiple mounting holes 124 and the hollow space 126, or the hollow space 126 and the multiple mounting holes 114 may also be spatially unconnected.

[0118] (Characteristics of Embodiment)

[0119] As described above, in one or more embodiments, the hedge trimmer 2 (an example of a working machine) includes: a working unit 4 (an example of a first working machine portion) including a pair of shear blades 16 (an example of a working mechanism) driven by an electric motor 20 (an example of a prime mover); a base 6 (an example of a second working machine portion) including a front handle 8 (an example of a handle) that can be gripped by a user; and vibration isolating members 90a, 90b, 90c disposed between the working unit 4 and the base 6. The base 6 (an example of one of the first working machine portion and the second working machine portion) is provided with first mounting members 128, 146, 164. The working unit 4 (an example of the other of the first working machine portion and the second working machine portion) is provided with second mounting members 134, 152, 168. The vibration isolation components 90a, 90b, 90c include: a first mounting portion 92, which is mounted on the first mounting part 128, 146, 164; a second mounting portion 94, which is arranged at a position offset in the negative direction of the Z direction (an example of the first direction) when viewed from the first mounting portion 92, and is mounted on the second mounting parts 134, 152, 168; a first connecting portion 98, which connects the first mounting portion 92 and the second mounting portion 94; and a first groove 102, which is formed by making the outer surface of the vibration isolation components 90a, 90b, 90c The portion corresponding to the outer surface of the first connecting portion 98 is recessed in a direction orthogonal to the negative direction of the Z direction.

[0120] By adopting the above-mentioned structure, the first groove 102 is provided, so that the cross-sectional area of ​​the first connecting portion 98 in the cross section perpendicular to the negative direction of the Z direction is reduced. As a result, the shear stiffness of the first connecting portion 98 in the direction perpendicular to the negative direction of the Z direction is reduced, so the first connecting portion 98 is easy to shear and deform in the direction perpendicular to the negative direction of the Z direction. Therefore, if the vibration isolation components 90a, 90b, and 90c are configured so that the direction in which the working unit 4 vibrates (front and rear direction) and the negative direction of the Z direction are orthogonal to each other, the first connecting portion 98 is sheared and deformed to a large extent when the working unit 4 vibrates, thereby greatly reducing the vibration transmitted from the working unit 4 to the base 6. Therefore, by adopting the above-mentioned structure, the vibration transmitted to the front handle 8 can be reduced, so that the discomfort caused to the user can be reduced.

[0121] In one or more embodiments, a hollow space 120 is formed inside the first connecting portion 98 .

[0122] With the above-mentioned structure, the hollow space 120 is provided, so that the cross-sectional area of ​​the first connecting portion 98 in the cross section perpendicular to the negative Z direction is further reduced. As a result, the shear rigidity of the first connecting portion 98 in the direction perpendicular to the negative Z direction is further reduced, so that the first connecting portion 98 is more likely to be shear-deformed in the direction perpendicular to the negative Z direction. As a result, when the working unit 4 vibrates in the direction perpendicular to the negative Z direction, the vibration transmitted from the working unit 4 to the base 6 is further reduced.

[0123] In one or more embodiments, the first mounting member 128, 146 includes a plurality of mounting protrusions 132, 150 (an example of a first mounting protrusion) protruding in the negative direction of the Z direction. The first mounting portion 92 includes a plurality of mounting holes 108 (an example of a first mounting hole) into which the plurality of mounting protrusions 132, 150 enter, and the mounting holes 108 are formed by recessing the outer surfaces of the vibration isolating members 90a, 90b, 90c in the negative direction of the Z direction.

[0124] With the above structure, the plurality of mounting protrusions 132, 150 enter the plurality of mounting holes 108, so that the first mounting portion 92 is constrained by the first mounting members 128, 146 in the direction perpendicular to the negative Z direction. This makes it possible to easily position the first mounting portion 92 relative to the first mounting members 128, 146.

[0125] In one or more embodiments, a hollow space 120 is formed inside the first connection portion 98 . The plurality of mounting holes 108 are connected to the hollow space 120 .

[0126] According to the above structure, when the vibration isolating members 90a, 90b, 90c are manufactured by injection molding, the same mold can be used to form the plurality of mounting holes 108 and the hollow space 120. This makes it easy to manufacture the vibration isolating members 90a, 90b, 90c.

[0127] In one or more embodiments, the second mounting member 134, 152, 168 includes a mounting frame 136, 154, 170 protruding in the negative direction of the Y direction (an example of the second direction) that is orthogonal to the negative direction of the Z direction. The second mounting portion 94 includes a mounting recess 112 for the mounting frame 136, 154, 170 to enter, and the mounting recess 112 is formed by recessing the outer surface of the vibration isolating member 90a, 90b, 90c in the negative direction of the Y direction.

[0128] With the above-described structure, the second mounting portion 94 is restrained by the second mounting member 134, 152, 168 in the direction perpendicular to the negative direction of the Y direction by the mounting frame 136, 154, 170 entering the mounting recess 112. This makes it possible to easily position the second mounting portion 94 relative to the second mounting member 134, 152, 168.

[0129] In one or more embodiments, the second mounting member 134, 152, 168 includes a plurality of mounting protrusions 138, 156, 172 (an example of a second mounting protrusion) protruding from the outer surface of the mounting frame 136, 154, 170 toward the positive direction of the Z direction (an example of a third direction) opposite to the negative direction of the Z direction. The second mounting portion 94 includes a plurality of mounting holes 116 (an example of a second mounting hole) into which the plurality of mounting protrusions 138, 156, 172 enter, and the mounting holes 116 are formed by recessing the wall surface of the mounting recess 112 toward the positive direction of the Z direction.

[0130] With the above structure, if the mounting frame 136, 154, 170 is to be removed from the mounting recess 112, the plurality of mounting protrusions 138, 156, 172 will be caught in the plurality of mounting holes 116. Thus, the mounting frame 136, 154, 170 can be prevented from being removed from the mounting recess 112, and thus the vibration isolating members 90a, 90b, 90c can be prevented from being separated from the second mounting member 134, 152, 168.

[0131] In one or more embodiments, a hollow space 120 is formed inside the first connection portion 98 . The plurality of mounting holes 116 are connected to the hollow space 120 .

[0132] According to the above structure, when the vibration isolating members 90a, 90b, 90c are manufactured by injection molding, the same mold can be used to form the plurality of mounting holes 116 and the hollow space 120. This makes it easy to manufacture the vibration isolating members 90a, 90b, 90c.

[0133] In one or more embodiments, the base 6 is provided with a third mounting member 140, 158, 174 in addition to the first mounting member 128, 146, 164. The vibration isolating members 90a, 90b, 90c further include: a third mounting portion 96, which is provided at a position offset in the negative direction of the Z direction when viewed from the second mounting portion 94 and is mounted on the third mounting member 140, 158, 174; a second connecting portion 100, which connects the second mounting portion 94 and the third mounting portion 96; and a second groove 104, which is formed by making the portion of the outer surface of the vibration isolating members 90a, 90b, 90c corresponding to the outer surface of the second connecting portion 100 concave in a direction orthogonal to the negative direction of the Z direction.

[0134] With the above-mentioned structure, another mounting member (third mounting member 140, 158, 174) is provided on the base 6. In addition, the vibration isolating members 90a, 90b, 90c are mounted on the third mounting members 140, 158, 174 by means of another mounting portion (third mounting portion 96). Thus, the vibration isolating members 90a, 90b, 90c can be mounted on the base 6 relatively firmly. However, in this structure, the vibration of the working unit 4 is transmitted to the base 6 not only via the first mounting members 128, 146, 164, the first mounting portion 92, the first connecting portion 98, the second mounting portion 94 and the second mounting members 134, 152, 168, but also via the third mounting members 140, 158, 174, the third mounting portion 96, the second connecting portion 100, the second mounting portion 94 and the second mounting members 134, 152, 168. Therefore, if the second connection part 100 is structured to be difficult to shear-deform, the vibration transmitted from the working unit 4 to the base 6 cannot be sufficiently reduced. In contrast, the above-mentioned structure is adopted, and the second groove 104 is provided, so that the cross-sectional area of ​​the second connection part 100 in the cross section perpendicular to the negative direction of the Z direction is reduced. As a result, the shear stiffness of the second connection part 100 in the direction perpendicular to the negative direction of the Z direction is reduced, so the second connection part 100 is easy to shear-deform in the direction perpendicular to the negative direction of the Z direction. Therefore, if the vibration isolation components 90a, 90b, and 90c are configured so that the direction in which the working unit 4 vibrates (front and rear direction) and the negative direction of the Z direction are mutually orthogonal, the second connection part 100 is shear-deformed to a large extent when the working unit 4 vibrates, so that the vibration transmitted from the working unit 4 to the base 6 can be sufficiently reduced.

[0135] In one or more embodiments, the operating mechanism includes a pair of shear blades 16 (an example of a pair of blades) that are relatively reciprocated by being driven by an electric motor 20. The vibration isolating members 90a, 90b, and 90c are arranged so that the negative direction in the Z direction is orthogonal to the reciprocating direction (front-rear direction) of the pair of shear blades 16.

[0136] The above-mentioned vibration isolating members 90a, 90b, and 90c exert a significant vibration isolating effect on the vibration of the working unit 4 in the direction orthogonal to the negative direction of the Z direction. Therefore, if the reciprocating direction (front-back direction) of the pair of shear blades 16 is not a direction orthogonal to the negative direction of the Z direction, there is a concern that the vibration accompanying the reciprocating motion of the pair of shear blades 16 cannot be sufficiently reduced and transmitted to the front handle 8. As a result, there is a concern that the user holding the front handle 8 will feel uncomfortable. With the above-mentioned structure, since the reciprocating direction (front-back direction) of the pair of shear blades 16 becomes a direction orthogonal to the negative direction of the Z direction, the vibration accompanying the reciprocating motion of the pair of shear blades 16 is transmitted to the front handle 8 on the basis of being sufficiently reduced by the vibration isolating members 90a, 90b, and 90c. This can reduce the discomfort caused to the user holding the front handle 8.

Claims

1. A working machine, wherein: The operating machinery includes: The first working machine part includes a working mechanism driven by a prime mover; a second working machine portion, comprising a handle capable of being grasped by a user; and a vibration isolating member disposed between the first working machine portion and the second working machine portion, A first mounting member is provided on one of the first working machine portion and the second working machine portion. A second mounting member is provided on the other of the first working machine portion and the second working machine portion, The vibration isolation component comprises: a first mounting portion mounted on the first mounting component; a second mounting portion provided at a position offset in the first direction when viewed from the first mounting portion and mounted on the second mounting member; a first connecting portion connecting the first mounting portion and the second mounting portion; and The first concave groove is formed by recessing a portion of the outer surface of the vibration-isolating member corresponding to the outer surface of the first connecting portion in a direction perpendicular to the first direction.

2. The working machine according to claim 1, wherein: A hollow space is formed inside the first connecting portion.

3. The working machine according to claim 1 or 2, wherein: The first mounting member includes a first mounting protrusion protruding toward the first direction, The first mounting portion includes a first mounting hole into which the first mounting protrusion enters, and the first mounting hole is formed by recessing an outer surface of the vibration-isolating member toward the first direction.

4. The working machine according to claim 3, wherein: A hollow space is formed inside the first connecting portion. The first mounting hole is connected to the hollow space.

5. The working machine according to any one of claims 1 to 4, wherein: The second mounting member includes a mounting frame protruding in a second direction orthogonal to the first direction. The second mounting portion includes a mounting recess into which the mounting frame enters, the mounting recess being formed by recessing an outer surface of the vibration-isolating member toward the second direction.

6. The working machine according to claim 5, wherein: The second mounting member includes a second mounting protrusion protruding from the outer surface of the mounting frame toward a third direction opposite to the first direction. The second mounting portion includes a second mounting hole into which the second mounting protrusion enters, and the second mounting hole is formed by recessing a wall surface of the mounting recess toward the third direction.

7. The working machine according to claim 6, wherein: A hollow space is formed inside the first connecting portion. The second mounting hole is connected to the hollow space.

8. The working machine according to any one of claims 1 to 7, wherein: The one of the first working machine portion and the second working machine portion is provided with a third mounting member in addition to the first mounting member. The vibration isolation component also includes: a third mounting portion provided at a position offset in the first direction when viewed from the second mounting portion and mounted on the third mounting member; a second connecting portion connecting the second mounting portion and the third mounting portion; and The second concave groove is formed by recessing a portion of the outer surface of the vibration-isolating member corresponding to the outer surface of the second connecting portion in a direction perpendicular to the first direction.

9. The working machine according to any one of claims 1 to 8, wherein: The working mechanism includes a pair of blades, which are driven by the prime mover to reciprocate relatively. The vibration isolating member is disposed so that the first direction is orthogonal to a reciprocating direction of the pair of blades.

10. A vibration isolating member, arranged between a first working machine portion and a second working machine portion in a working machine comprising the first working machine portion and the second working machine portion, the first working machine portion comprising a working mechanism driven by a prime mover, the second working machine portion comprising a handle that can be gripped by a user, wherein: A first mounting member is provided on one of the first working machine portion and the second working machine portion. A second mounting member is provided on the other of the first working machine portion and the second working machine portion, The vibration isolation component comprises: a first mounting portion mounted on the first mounting component; a second mounting portion provided at a position offset in the first direction when viewed from the first mounting portion and mounted on the second mounting member; a first connecting portion connecting the first mounting portion and the second mounting portion; and The first concave groove is formed by recessing a portion of the outer surface of the vibration-isolating member corresponding to the outer surface of the first connecting portion in a direction perpendicular to the first direction.

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