Work machine

Abstract

The present specification discloses a work machine. A work machine is provided with: a housing; a working member which is supported by the housing so as to be swingable and which is at least partially disposed outside the housing; and a weight that is disposed inside the housing and swings when the work member swings. The working member and the counterweight swing so as to approach each other and separate from each other.

Description

Technical Field

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

[0002] US Patent Application Publication No. 2013 / 0098644 discloses a working machine including a housing and a working member supported by the housing in a swingable manner and at least partially arranged outside the housing. Summary of the invention

[0003] Problem that the invention aims to solve

[0004] In the above-mentioned working machine, when the working member swings, the housing vibrates. In this specification, a technology capable of reducing the vibration of the housing caused by the swing of the working member is provided.

[0005] Solutions for solving problems

[0006] The present specification discloses a working machine. The working machine comprises: a housing; a working member supported by the housing in a swingable manner and at least partially arranged outside the housing; and a counterweight arranged inside the housing and swinging when the working member swings. The working member and the counterweight swing in a manner of approaching and moving away from each other.

[0007] According to the above configuration, the vibration of the housing caused by the swing of the weight can be used to offset the vibration of the housing caused by the swing of the working member. As a result, the vibration of the housing can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a perspective view of the working machine 2 according to the embodiment.

[0009] Figure 2 It is an exploded perspective view of the vicinity of the rear end unit 8 in the working machine 2 of the embodiment.

[0010] Figure 3 It is a perspective view of the vicinity of the front end unit 10 in the working machine 2 of the embodiment.

[0011] Figure 4 It is a cross-sectional view of the front end unit 10 in the working machine 2 of the embodiment.

[0012] Figure 5 It is a side view of the working machine 2 of the embodiment in a state where the front end right housing 42 is removed.

[0013] Figure 6 It is an exploded perspective view of the transmission mechanism 90, the blade 86, and the counterweight 88 of the embodiment.

[0014] Figure 7 It is an exploded perspective view of the transmission mechanism 90, the blade 86, and the counterweight 88 of the embodiment.

[0015] Figure 8 It is a side view of the working machine 2 of the embodiment in a state where the left cover 46 is removed.

[0016] Fig. 9 It is a cross-sectional view of the front end unit 10 in the working machine 2 of the embodiment.

[0017] Fig.10 It is a cross-sectional view of the front end unit 10 in the working machine 2 of the embodiment.

[0018] Fig.11 It is a front view of the transmission mechanism 90, the blade 86, and the counterweight 88 of the embodiment.

[0019] Fig.12 It is a side view of the working machine 2 of the embodiment in a state where the left cover 46 is removed.

[0020] Fig.13 It is a side view of the working machine 2 of the embodiment in a state where the front end right housing 42 is removed.

[0021] Fig.14 It is an exploded perspective view of the first transmission unit 78 , the first output shaft 82 , the blade 86 , and the adjustment member 160 according to the embodiment.

[0022] Fig.15 It is an exploded perspective view of the first transmission unit 78 , the first output shaft 82 , the blade 86 , and the adjustment member 160 of the embodiment.

[0023] Fig.16 It is an exploded perspective view of the first output shaft 82 and the first adjustment member 170 according to the embodiment.

[0024] Fig.17 It is a cross-sectional view of the first output shaft 82 , the blade 86 , and the first adjustment member 170 of the embodiment.

[0025] Fig.18 It is a cross-sectional view of the first output shaft 82 and the first adjustment member 170 of the embodiment.

[0026] Fig.19 It is an exploded perspective view of the first output shaft 82 and the second adjustment member 172 of the embodiment.

[0027] Fig. 20 It is a cross-sectional view of the first output shaft 82 , the blade 86 , and the second adjustment member 172 of the embodiment.

[0028] Fig.21 It is a perspective view of the right mounting portion 120 of the blade 86 of the embodiment.

[0029] Fig. 22 It is a perspective view of the left mounting portion 124 of the blade 86 of the embodiment.

[0030] Fig.23 It is a perspective view of the vicinity of the front end unit 10 in a state where the blade cover 300 is attached to the blade portion 116 in the working machine 2 of the embodiment.

[0031] Fig.24 It is a cross-sectional view of a state where the blade cover 300 is attached to the blade 86 in the blade 86 and the blade cover 300 of the embodiment.

[0032] Fig.25 It is a front cross-sectional view of a state where the blade cover 300 is attached to the blade 86 in the blade 86 and the blade cover 300 of the embodiment.

[0033] Fig.26 It is a cross-sectional view of the blade 86 and the blade cover 300 of the embodiment before the blade cover 300 is attached to the blade 86.

[0034] Fig. 27 It is a front view of the vicinity of the front end unit 10 when the blade cover 300 is being mounted on the blade 86 in the working machine 2 of the embodiment.

[0035] Fig.28 This is a cross-sectional view before the blade cover 300 is attached to the rod 4 in the working machine 2 of the embodiment.

[0036] Fig.29 It is a cross-sectional view of a state where the blade cover 300 is attached to the rod 4 in the working machine 2 of the embodiment. DETAILED DESCRIPTION

[0037] With reference to the accompanying drawings, representative and non-limiting specific examples of the present invention are described in detail below. This detailed description is intended only to show the details of 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, the disclosed additional features and technical solutions can be used separately or together with other features and technical solutions to provide further improved working machines, their manufacturing methods, and methods of use.

[0038] In addition, the combination of features and processes disclosed in the following detailed description is not necessary in the broadest sense for practicing the present invention, but is only recorded for the purpose of specifically illustrating the representative specific examples of the present invention. Moreover, when providing additional and useful embodiments of the present invention, the various features of the following representative specific examples and the various features described in the claims do not necessarily have to be combined in the specific examples or the order in which they are listed.

[0039] Different from the structures of the features described in the embodiments and / or claims, all the features described in this specification and / or claims are intended to be disclosed individually and independently of each other as limitations on the original disclosure and the specific matters described in the claims. In addition, all numerical ranges and records involving groups or groups are intended to disclose their intermediate structures as limitations on the original disclosure and the specific matters described in the claims.

[0040] In one or more embodiments, the working machine may further include: a prime mover; and a transmission mechanism disposed inside the housing. Alternatively, the transmission mechanism may include: a rotating member that rotates around a rotation axis by the action of the prime mover; a first transmission unit that is mounted on the rotating member and transmits the rotation of the rotating member to the working member; and a second transmission unit that is mounted on the rotating member and transmits the rotation of the rotating member to the counterweight.

[0041] According to the above configuration, both the first transmission unit and the second transmission unit can be operated by the operation of one rotating member. This can reduce the number of components.

[0042] In one or more embodiments, the first transmission unit may include a first rod mounted on the rotating member. The second transmission unit may include a second rod mounted on the rotating member. The first rod and the second rod may at least partially overlap when the working machine is viewed along the rotation axis.

[0043] In the structure in which the first rod does not at least partially overlap with the second rod when the working machine is viewed along the rotation axis, the working machine is enlarged in a direction perpendicular to the rotation axis. According to the above structure, the first rod at least partially overlaps with the second rod when the working machine is viewed along the rotation axis, so it is possible to suppress the working machine from being enlarged in a direction perpendicular to the rotation axis.

[0044] In one or more embodiments, the first transmission unit may further include: a first spindle; and a third rod, which is movably mounted on the first rod via the first spindle, and transmits the movement of the first rod to the working member. The second transmission unit may further include: a second spindle; and a fourth rod, which is movably mounted on the second rod via the second spindle, and transmits the movement of the second rod to the counterweight.

[0045] According to the above configuration, the first transmission unit includes the third rod, so that the position of the swing axis of the working member can be easily adjusted. In addition, the second transmission unit includes the fourth rod, so that the position of the swing axis of the weight can be easily adjusted.

[0046] In one or more embodiments, the working machine may further include: a first output shaft connecting the first transmission unit and the working component and extending on the swing axis of the working component; and a second output shaft connecting the second transmission unit and the counterweight and extending on the swing axis of the counterweight.

[0047] According to the above structure, the position of the working member relative to the first transmission unit can be easily adjusted by the first output shaft in the direction in which the swing axis of the working member extends. In addition, the position of the counterweight relative to the second transmission unit can be easily adjusted by the second output shaft in the direction in which the swing axis of the counterweight extends.

[0048] In one or more embodiments, the distance between the rotation axis of the rotating member and the swing axis of the working member may be substantially the same as the distance between the rotation axis of the rotating member and the swing axis of the counterweight.

[0049] According to the above configuration, the vibration of the housing caused by the swing of the weight can be used to further cancel the vibration of the housing caused by the swing of the working member. As a result, the vibration of the housing can be further reduced.

[0050] In one or more embodiments, the working member may include a first portion and a second portion supported by the housing. The first portion and the second portion may be disposed on a swing axis of the working member. The counterweight may be disposed between the first portion and the second portion in a direction along the swing axis of the working member.

[0051] In a structure in which the counterweight is not disposed between the first portion and the second portion in the direction along the swing axis of the working member, the working member may be tilted due to the deadweight of the counterweight. According to the above structure, the counterweight is disposed between the first portion and the second portion in the direction along the swing axis of the working member, so that the working member can be restrained from tilting due to the deadweight of the counterweight.

[0052] In one or more embodiments, the working machine may further include: a rod fixed to the housing and extending in the longitudinal direction; and a handle fixed to the rod and gripped by a user.

[0053] According to the above structure, the user controls the lever-type working machine by holding the handle. If the housing vibrates due to the swing of the working member, the controllability of the lever-type working machine deteriorates due to the vibration of the housing. According to the above structure, the vibration of the housing caused by the swing of the working member is offset by the vibration of the housing caused by the swing of the counterweight, so that the controllability of the lever-type working machine can be suppressed from being deteriorated.

[0054] In one or more embodiments, the working element may include a blade that digs the ground.

[0055] According to the above structure, the housing vibrates as the blade digs the ground. Therefore, vibrations caused by the swing of the blade and vibrations caused by the blade digging the ground are generated in the housing. As a result, the housing vibrates greatly. According to the above structure, the vibration of the housing caused by the swing of the counterweight can be used to offset the vibration of the housing caused by the swing of the blade. As a result, the vibration of the housing can be reduced.

[0056] In one or more embodiments, the working machine may include: a blade unit including a working member provided with a blade portion; and a blade cover that can be mounted on the blade unit. The blade portion may extend in a first direction and be arranged along a first plane including the first direction. The blade cover may include: a cover portion that covers the blade portion when the blade cover is mounted on the blade unit; an abutment portion that abuts against the blade unit in a second direction orthogonal to the first plane when the blade cover is mounted on the blade unit to maintain the blade cover in a state where the cover portion covers the blade portion; and a release portion that can be elastically deformed to release the abutment between the abutment portion and the blade unit in the second direction when a force resisting the elastic restoring force of the release portion is applied to the release portion.

[0057] According to the above configuration, when the user applies a force to the release portion that resists the elastic restoring force of the release portion, the contact between the contact portion and the blade unit is released in the second direction. Thus, the blade cover can be easily removed from the blade unit.

[0058] In one or more embodiments, the blade cover may be slidable relative to the blade unit along the first direction when the abutting portion abuts against the blade unit in the second direction, and may be detachable relative to the blade unit by sliding relative to the blade unit along the first direction.

[0059] According to the above configuration, the blade cover can be attached to and detached from the blade unit by a simple operation of sliding the blade cover relative to the blade unit.

[0060] In one or more embodiments, the blade cover may further include a friction force imparting portion which can abut against the blade portion and apply friction force in a third direction opposite to the first direction to the blade portion when the blade cover slides relative to the blade unit in the first direction.

[0061] According to the above configuration, the vibration of the blade cover can be suppressed by applying the frictional force between the frictional force applying portion and the blade portion.

[0062] In one or more embodiments, the cross-sectional shape of the cover portion and the cross-sectional shape of the contact portion may be substantially the same in the first direction.

[0063] According to the above-mentioned structure, the blade cover can be easily manufactured by a simple manufacturing method such as extrusion molding.

[0064] In one or more embodiments, the working machine may further include a rod fixed to the blade unit and extending in the longitudinal direction. The release portion may include a mounting portion that can be mounted on the rod and surrounds the rod when mounted on the rod.

[0065] According to the above structure, the blade cover can be attached to the rod when the working machine is used for work. Thus, it is possible to prevent the blade cover from being lost when the working machine is used for work.

[0066] In one or more embodiments, the release portion may include a first operating portion and a second operating portion, and the first operating portion and the second operating portion are separately arranged in a fourth direction orthogonal to the first direction and the second direction for operation by a user. Alternatively, the contact portion may include a first contact portion and a second contact portion separately arranged in the fourth direction. Alternatively, when the first operating portion and the second operating portion are operated in a manner such that the first operating portion and the second operating portion are close to each other, the first contact portion and the second contact portion move in directions away from each other and are separated from the blade unit.

[0067] According to the above configuration, the user can easily remove the blade cover from the blade unit by operating the releasing portion so that the first operating portion and the second operating portion are brought closer to each other.

[0068] In one or more embodiments, when the working machine is placed on the placement surface in a state where the blade cover is attached to the blade unit, the release portion may be in contact with the placement surface.

[0069] According to the above configuration, when the working machine is placed on the placing surface, the releasing portion can be brought into contact with the placing surface, thereby allowing the working machine to be arranged in a specific posture relative to the placing surface.

[0070] In one or more embodiments, the blade unit may include a housing. The contact portion may be separated from the housing when the blade cover is attached to the blade unit, and contact the blade portion in the second direction.

[0071] According to the above structure, the blade cover is directly attached to the blade portion. Thus, the blade cover can be miniaturized.

[0072] (Example)

[0073] like Figure 1As shown, the working machine 2 is a pole-type working machine. The working machine 2 is a weeder that digs the ground to weed. The working machine 2 includes a pole 4, a ring handle 6, a rear unit 8, and a front unit 10. The user controls the working machine 2 by holding the ring handle 6 with one hand and the rear unit 8 with the other hand.

[0074] The rod 4 has an elongated rod shape. The rod 4 includes a first rod 12 and a second rod 14. The first rod 12 is detachably mounted on the second rod 14. The ring handle 6 is fixed to the first rod 12. Hereinafter, the direction in which the rod 4 extends is referred to as the front-rear direction, the direction perpendicular to the front-rear direction is referred to as the left-right direction, and the direction perpendicular to the front-rear direction and the left-right direction is referred to as the up-down direction.

[0075] The rear end unit 8 is fixed near the rear end of the rod 4. Figure 2 As shown, the rear end unit 8 includes a rear end housing 16, a motor housing 18, a motor 20, a trigger 22, a shark fin 24, and a battery pack BP.

[0076] The rear housing 16 includes a rear right housing 28 defining the outer shape of the right half of the rear housing 16 and a rear left housing 30 defining the outer shape of the left half of the rear housing 16. The rear housing 16 includes a motor housing portion 32, a grip portion 34, and a switch housing portion 36.

[0077] A battery pack BP is detachably mounted on the rear surface of the motor housing portion 32. The battery pack BP includes a rechargeable secondary battery, such as a lithium-ion battery. The grip portion 34 is gripped by a user when the working machine 2 is used for work.

[0078] The motor housing 18 and the motor 20 are arranged inside the motor housing portion 32. The motor 20 is arranged inside the motor housing 18. Figure 2 In FIG. 1 , the motor 20 is shown by a dotted line. The motor 20 is an example of a prime mover. The motor 20 is, for example, a brushless motor. When the motor 20 rotates, the transmission shaft 38 rotates around an axis extending in the front-rear direction. Figure 2 In FIG. 1 , the transmission shaft 38 is shown by a dotted line. The transmission shaft 38 is supported by the rod 4 so as to be rotatable inside the rod 4.

[0079] The trigger 22 is installed in a pushable manner at the lower part of the switch storage part 36. The shark fin 24 is installed in a pushable manner at the upper part of the grip part 34. If the shark fin 24 is pushed in, the trigger 22 can be pushed in. In a state where the shark fin 24 is pushed in by the palm of the user holding the grip part 34, if the trigger 22 is pushed in by the finger of the user holding the grip part 34, the motor 20 rotates.

[0080] like Figure 3As shown, the front end unit 10 is fixed to the front end of the rod 4. The front end unit 10 is an example of a blade unit. The front end unit 10 includes a front end housing 40. The front end housing 40 includes a front end right housing 42, a front end left housing 44, and a left cover 46. The front end right housing 42 defines the outer shape of the right part of the front end housing 40. The front end left housing 44 and the left cover 46 define the outer shape of the left part of the front end housing 40.

[0081] The front left housing 44 includes a main portion 48 and an auxiliary portion 50. The main portion 48 is fixed to the front right housing 42. The rod 4 is sandwiched between the main portion 48 and the front right housing 42. Figure 4 As shown, the main part 48 and the front right housing 42 define a right storage space 52. The main part 48 includes a partition wall 54, and the auxiliary part 50 protrudes to the left from the partition wall 54. The auxiliary part 50 is fixed to the left cover 46. The auxiliary part 50, the left cover 46, and the partition wall 54 define a rod storage space 56. The partition wall 54 divides the internal space of the front housing 40 into the right storage space 52 and the rod storage space 56.

[0082] The front end housing 40 is further provided with a worm cover 58. The worm cover 58 is fixed to the partition wall 54 from the right side of the partition wall 54. The worm cover 58 covers a portion of the partition wall 54. The worm cover 58 divides the right storage space 52 into a worm storage space 60 and a counterweight storage space 62. The worm storage space 60 is partitioned by the partition wall 54 and the inner surface of the worm cover 58. The counterweight storage space 62 is partitioned by the outer surface of the front end right housing 42, the main portion 48, and the worm cover 58.

[0083] The front end unit 10 further includes a worm 64, a worm wheel 66, and a rotating shaft 68. The worm 64 and the worm wheel 66 are arranged in the worm storage space 60. Figure 5 As shown, the worm 64 is fixed to the outer peripheral surface of the front end of the transmission shaft 38. The transmission shaft 38 is rotatably supported by the front end housing 40 by bearings 69a and 69b, and the worm 64 is arranged between the bearings 69a and 69b. The worm wheel 66 meshes with the worm 64. If the worm 64 rotates with the transmission shaft 38 around the axis extending in the front-back direction, the worm wheel 66 rotates around the rotation axis AX1 extending in the left-right direction. The rotation speed of the worm wheel 66 is lower than the rotation speed of the worm 64. Therefore, the worm 64 and the worm wheel 66 function as a speed reduction mechanism.

[0084] like Figure 4As shown, the rotating shaft 68 is inserted into the worm wheel 66. The rotating shaft 68 is arranged inside the front end housing 40. The rotating shaft 68 is rotatably supported by the front end right housing 42 via a bearing 70. In addition, the rotating shaft 68 is rotatably supported by the partition wall 54 via a bearing 72. The rotating shaft 68 rotates around the rotation axis AX1 together with the worm wheel 66. The rotating shaft 68 is inserted into the opening of the worm cover 58 and the opening of the partition wall 54. The vicinity of the left end of the rotating shaft 68 is arranged in the rod storage space 56.

[0085] like Figure 6 and Figure 7 As shown, the front end unit 10 includes a disk 76, a first transmission unit 78, a second transmission unit 80, a first output shaft 82, a second output shaft 84, a blade 86, and a weight 88. Figure 8 As shown, the disk 76 (refer to Figure 4 ), the first transmission unit 78 and the second transmission unit 80 are arranged in the rod storage space 56. Hereinafter, the rotating shaft 68, the disk 76, the first transmission unit 78, and the second transmission unit 80 are sometimes collectively referred to as a transmission mechanism 90. In addition, the rotating shaft 68 and the disk 76 are sometimes collectively referred to as a rotating member 91.

[0086] like Figure 6 and Figure 7 As shown, the disk 76 has a shaft insertion hole 92 that passes through the disk 76 in the left-right direction. The left end of the rotating shaft 68 is inserted into the shaft insertion hole 92. The disk 76 is sandwiched between a pair of fixing plates 93a and 93b. Thus, the disk 76 is fixed to the left end of the rotating shaft 68. The disk 76 rotates with the rotating shaft 68 around the rotation axis AX1.

[0087] The disk 76 includes a central plate portion 94, a right disk portion 96, and a left disk portion 98. The central plate portion 94 has a circular plate shape. The right disk portion 96 is arranged on the right surface of the central plate portion 94. The left disk portion 98 is arranged on the left surface of the central plate portion 94. When the disk 76 is observed along the rotation axis AX1, the left disk portion 98 overlaps with the right disk portion 96 at least partially. The outer peripheral surface of the right disk portion 96 and the outer peripheral surface of the left disk portion 98 have a circular shape. The central axis of the outer peripheral surface of the right disk portion 96 and the central axis of the outer peripheral surface of the left disk portion 98 are offset relative to the central axis of the shaft insertion hole 92, that is, the rotation axis AX1. Around the central axis of the shaft insertion hole 92, the central axis of the outer peripheral surface of the right disk portion 96 is arranged at a position of 0 degrees, and the central axis of the outer peripheral surface of the left disk portion 98 is arranged at a position of 180 degrees. If the central plate portion 94 rotates, the right disk portion 96 and the left disk portion 98 rotate around the rotation axis AX1. The phase of the rotation cycle of the right disk portion 96 is shifted from the phase of the rotation cycle of the left disk portion 98 by 180 degrees.

[0088] The first transmission unit 78 is attached to the right disk portion 96. The first transmission unit 78 is attached to the blade 86 via the first output shaft 82. The first transmission unit 78 includes a first rod 100, a first connection spindle 102, and a second rod 104.

[0089] The first rod 100 includes a first mounting portion 106 and a first arm portion 108. The first mounting portion 106 has a first disk insertion hole 110 that penetrates the first mounting portion 106 in the left-right direction. The right disk portion 96 is inserted into the first disk insertion hole 110 via a bearing. The first mounting portion 106 is disposed between the central plate portion 94 and the fixed plate 93a. When the transmission mechanism 90 is viewed along the rotation axis AX1, the first mounting portion 106 and the central plate portion 94 at least partially overlap. The first arm portion 108 protrudes from the first mounting portion 106.

[0090] The first connection spindle 102 is inserted into the tip of the first arm portion 108. The first connection spindle 102 is inserted into one end of the second rod 104. The first connection spindle 102 extends in the left-right direction.

[0091] One end of the second rod 104 is attached to the first arm 108 via the first connecting spindle 102. The second rod 104 is attached to the first arm 108 so as to be movable (rotatable) relative to the first rod 100. When the first transmission unit 78 is viewed along the rotation axis AX1, the first arm 108 and the second rod 104 at least partially overlap.

[0092] The first output shaft 82 is inserted into the other end of the second rod 104. The first output shaft 82 is fixed to the other end of the second rod 104. The first output shaft 82 connects the other end of the second rod 104 and the blade 86. The first output shaft 82 extends in the left-right direction. The center axis AX2 of the first output shaft 82 extends in the left-right direction. The center axis AX2 is arranged at a position closer to the front side than the rotation axis AX1. Fig. 9 As shown, the center axis AX2 is substantially parallel to the rotation axis AX1. The first output shaft 82 is rotatably supported by the front housing 40 via bearings 112a and 112b. Both ends of the first output shaft 82 are arranged outside the front housing 40.

[0093] The blade 86 is mounted on the first output shaft 82. The blade 86 moves together with the first output shaft 82. The blade 86 is an example of a working member. The blade 86 is formed of, for example, a metal material. The blade 86 is arranged outside the front end housing 40. In addition, in a modified example, a part of the blade 86 may be arranged outside the front end housing 40. The blade 86 is supported on the front end housing 40 by means of the first output shaft 82. Figure 6 and Figure 7 As shown, the blade 86 includes a blade portion 116 , a right connecting portion 118 , a right mounting portion 120 , a left connecting portion 122 , and a left mounting portion 124 .

[0094] The blade portion 116 has a substantially flat plate shape extending in the left-right direction and the front-back direction. The blade portion 116 has a length direction in the left-right direction. A plurality of blade tips 116a are formed at the front end and the rear end of the blade portion 116, respectively. The plurality of blade tips 116a are arranged in the left-right direction at the front end and the rear end of the blade portion 116, respectively.

[0095] One end of the right connecting portion 118 is connected to the right end of the blade portion 116. The right connecting portion 118 extends upward from the right end of the blade portion 116, then bends and extends to the left, and further bends and extends upward. The right mounting portion 120 is connected to the other end of the right connecting portion 118. Fig. 9 As shown in FIG. 1 , the right mounting portion 120 and the other end of the right connecting portion 118 are mounted to the right end of the first output shaft 82 by means of a bolt 126. Hereinafter, the right mounting portion 120 and the other end of the right connecting portion 118 are sometimes referred to as a first portion 128. The first portion 128 is supported by the front end housing 40 via the first output shaft 82. The first portion 128 is arranged on the central axis AX2.

[0096] like Figure 6 and Figure 7 As shown in FIG. 1 , one end of the left connecting portion 122 is connected to the left end of the blade portion 116. The left connecting portion 122 extends upward from the left end of the blade portion 116, then bends and extends to the right, and further bends and extends upward. The left mounting portion 124 is connected to the other end of the left connecting portion 122. Fig. 9 As shown in FIG. 1 , the left mounting portion 124 and the other end of the left connecting portion 122 are mounted to the left end of the first output shaft 82 by means of a bolt 130. Hereinafter, the left mounting portion 124 and the other end of the left connecting portion 122 are sometimes referred to as a second portion 132. The second portion 132 is supported by the front end housing 40 via the first output shaft 82. The second portion 132 is arranged on the central axis AX2.

[0097] like Figure 6 and Figure 7 As shown, the second transmission unit 80 is mounted on the left plate portion 98. The second transmission unit 80 is mounted on the counterweight 88 via the second output shaft 84. The second transmission unit 80 includes a third rod 136, a second connection spindle 138, and a fourth rod 140.

[0098] The shape of the third rod 136 is substantially the same as that of the first rod 100. The third rod 136 includes a third mounting portion 142 and a third arm portion 144. The third mounting portion 142 includes a third disk insertion hole 146 that penetrates the third mounting portion 142 in the left-right direction. The left disk portion 98 is inserted into the third disk insertion hole 146 via a bearing. The third mounting portion 142 is disposed between the central plate portion 94 and the fixed plate 93b. When the transmission mechanism 90 is viewed along the rotation axis AX1, the third mounting portion 142 overlaps at least partially with the central plate portion 94 and the first mounting portion 106, respectively. The length of the third arm portion 144 is substantially the same as that of the first arm portion 108.

[0099] The shape of the second connection spindle 138 is substantially the same as that of the first connection spindle 102. The second connection spindle 138 is inserted into the tip of the third arm portion 144. The second connection spindle 138 is inserted into one end of the fourth rod 140. The second connection spindle 138 extends in the left-right direction.

[0100] The shape of the fourth rod 140 is substantially the same as that of the second rod 104. Therefore, the length of the fourth rod 140 is substantially the same as that of the second rod 104. One end of the fourth rod 140 is attached to the third arm 144 via the second connecting spindle 138. The fourth rod 140 is attached to the third arm 144 in a movable (rotatable) manner relative to the third rod 136. When the second transmission unit 80 is viewed in the left-right direction, the third arm 144 and the fourth rod 140 at least partially overlap.

[0101] like Fig.10 As shown, the second output shaft 84 is inserted into the other end of the fourth rod 140. The second output shaft 84 is fixed to the other end of the fourth rod 140. The second output shaft 84 connects the other end of the fourth rod 140 and the counterweight 88. The second output shaft 84 extends in the left-right direction. The central axis AX3 of the second output shaft 84 extends in the left-right direction. Figure 5 As shown, the center axis AX3 is arranged at a position forward of the rotation axis AX1 and the center axis AX2. The center axis AX3 is substantially parallel to the rotation axis AX1 and the center axis AX2. The distance between the rotation axis AX1 and the center axis AX3 is substantially the same as the distance between the rotation axis AX1 and the center axis AX2. Fig.10 As shown in FIG. 1 , the second output shaft 84 is rotatably supported by the front end housing 40 via bearings 148 a and 148 b. The second output shaft 84 is disposed inside the front end housing 40 .

[0102] The counterweight 88 is fixed to the second output shaft 84. The counterweight 88 is formed of a metal material, for example. The counterweight 88 has a substantially T-shaped shape. The weight of the counterweight 88 is greater than the weight of the blade 86. The counterweight 88 includes a first extension portion 152 extending from the second output shaft 84 and a second extension portion 154 extending from the top end of the first extension portion 152 in the left and right directions. Figure 5 As shown, the distance between the center axis AX3 and the second extension portion 154 is shorter than the distance between the center axis AX2 and the blade portion 116 of the blade 86. Fig.11 As shown, in the left-right direction, the counterweight 88 is arranged between the first portion 128 and the second portion 132 of the blade 86. In the left-right direction, the position of the center of the counterweight 88 in the left-right direction is substantially the same as the position of the center of the blade 86 in the left-right direction.

[0103] like Figure 8 and Fig.12 As shown, when the rotating shaft 68 rotates around the rotating axis AX1, the disk 76 rotates around the rotating axis AX1. Figure 7 ) and the left plate portion 98 (refer to Figure 6 ) rotates around the rotation axis AX1. As the right disk portion 96 rotates, the first arm portion 108 moves, and the first connecting spindle 102 is at the first position (refer to Figure 8 ) and the second position (refer to Fig.12 ). As a result, the second rod 104 swings around the central axis AX2, and the first output shaft 82 rotates around the central axis AX2. When the first connecting spindle 102 moves from the first position to the second position, the first output shaft 82 moves in the first direction D1 (refer to Figure 8 ) moves, when the first connecting spindle 102 moves from the second position to the first position, the first connecting spindle 102 moves in the second direction D2 (refer to Fig.12 ) moves. The first direction D1 is the opposite direction to the second direction D2. As a result, the blade 86 swings around the central axis AX2. The central axis AX2 corresponds to the swing axis of the blade 86. If the blade 86 contacts the ground while the blade 86 is swinging, the soil on the ground is dug by the blade 86. Thus, grass growing from the ground is removed from the ground.

[0104] In addition, as the left disk portion 98 rotates, the third arm portion 144 moves, and the second connecting spindle 138 is at the third position (refer to Figure 8 ) and the 4th position (refer to Fig.12). As a result, the fourth rod 140 swings around the central axis AX3, and the second output shaft 84 rotates around the central axis AX3. The rotation speed of the second output shaft 84 is substantially the same as the rotation speed of the first output shaft 82. When the second connecting spindle 138 moves from the third position to the fourth position, the second output shaft 84 rotates around the central axis AX3 in the third direction D3 (refer to Figure 8 ) moves, and when the second connecting spindle 138 moves from the fourth position to the third position, it moves in the fourth direction D4 (refer to Fig.12 ) movement. The third direction D3 is a direction opposite to the first direction D1. The fourth direction D4 is a direction opposite to both the third direction D3 and the second direction D2. Figure 5 and Fig.13 As shown, the counterweight 88 swings around the central axis AX3. The central axis AX3 corresponds to the swing axis of the counterweight 88. When observing the front end unit 10 from the right side, when the blade 86 swings in the clockwise direction (the first direction D1), the counterweight 88 swings in the counterclockwise direction (the third direction D3). In addition, when the blade 86 swings in the counterclockwise direction (the second direction D2), the counterweight 88 swings in the clockwise direction (the fourth direction D4). That is, when the blade 86 swings in a manner close to the counterweight 88, the counterweight 88 swings in a manner close to the blade 86, and when the blade 86 swings in a manner away from the counterweight 88, the counterweight 88 swings in a manner away from the blade 86. Therefore, the vibration of the front end housing 40 caused by the swing of the blade 86 is offset by the vibration of the front end housing 40 caused by the swing of the counterweight 88.

[0105] In this embodiment, the blade 86 is mounted on the first output shaft 82 in such a manner that the mounting posture of the blade 86 relative to the front housing 40 can be adjusted. Fig.14 and Fig.15 As shown, the front end unit 10 includes two adjustment members 160. The adjustment member 160 is detachably mounted on the first output shaft 82. The adjustment member 160 is formed of, for example, a metal material. In a modified example, the adjustment member 160 may also be formed of a resin material. Hereinafter, one adjustment member 160 is sometimes referred to as a first adjustment member 170, and the other adjustment member 160 is sometimes referred to as a second adjustment member 172. In addition, the shape of the first adjustment member 170 is substantially the same as the shape of the second adjustment member 172.

[0106] like Fig.16As shown, the adjustment member 160 includes a base 174, a mounting portion 176, and an adjustment portion 178. The base 174 has a substantially circular plate shape. The base 174 includes an outer peripheral surface 174a, a first side surface 174b, and a second side surface 174c. The outer peripheral surface 174a has a circular shape. The center 174d of the circle of the outer peripheral surface 174a is arranged on the central axis AX2. The outer peripheral surface 174a connects the periphery of the first side surface 174b and the periphery of the second side surface 174c. The first side surface 174b is a surface on the side opposite to the second side surface 174c.

[0107] The mounting portion 176 is a through hole. The cross section of the mounting portion 176 has a substantially circular shape, and the plurality of circular portions are linear shapes. The mounting portion 176 penetrates the base 174 in the left-right direction from the first side surface 174b to the second side surface 174c. Fig.17 As shown, the center of the cross section of the mounting portion 176 is arranged on the circle center 174d of the outer peripheral surface 174a of the base 174, that is, on the central axis AX2. The mounting portion 176 includes an arc portion 179 and a positioning portion 180.

[0108] The arc portion 179 includes a first arc portion 182, a second arc portion 184, and a third arc portion 186. The first arc portion 182, the second arc portion 184, and the third arc portion 186 are arranged separately from each other. The first arc portion 182, the second arc portion 184, and the third arc portion 186 have the same circle center 174d. The length of the first arc portion 182 is longer than the length of the second arc portion 184 and the length of the third arc portion 186. The length of the second arc portion 184 is substantially the same as the length of the third arc portion 186.

[0109] The positioning portion 180 includes a first plane portion 190, a second plane portion 192, and a third plane portion 194. The first plane portion 190, the second plane portion 192, and the third plane portion 194 have a planar shape. The first plane portion 190 is connected to one end of the first arc portion 182 and one end of the second arc portion 184. The second plane portion 192 is connected to the other end of the second arc portion 184 and one end of the third arc portion 186. The third plane portion 194 is connected to the other end of the third arc portion 186 and the other end of the first arc portion 182.

[0110] The first plane portion 190, the second plane portion 192, and the third plane portion 194 are arranged apart from each other. The angle (90 degrees) between the first plane portion 190 and the second plane portion 192 is substantially the same as the angle (90 degrees) between the second plane portion 192 and the third plane portion 194 around the center 174d. The first plane portion 190 is substantially parallel to the third plane portion 194. The second plane portion 192 is inclined 90 degrees relative to both the first plane portion 190 and the third plane portion 194. The length of the first plane portion 190 around the center 174d is substantially the same as the length of the second plane portion 192 around the center 174d and the length of the third plane portion 194 around the center 174d.

[0111] like Fig.16 As shown, the adjustment portion 178 is arranged on the outer peripheral surface 174a of the base 174. The adjustment portion 178 has a plurality of (seven in this embodiment) receiving grooves 198. The cross section of the receiving groove 198 has a substantially trapezoidal shape. The receiving groove 198 is recessed inward in the radial direction of the base 174 from the outer peripheral surface 174a of the base 174 toward the circle center 174d. The receiving groove 198 is connected to the first side surface 174b of the base 174. The receiving groove 198 is not connected to the second side surface 174c of the base 174.

[0112] The plurality of storage grooves 198 are arranged in an evenly spaced arrangement around the central axis AX2. Adjacent storage grooves 198 are separated. The plurality of storage grooves 198 are arranged around the central axis AX2 at a portion of the entire circumference of the outer peripheral surface 174a of the base 174. For the plurality of storage grooves 198, the interval between the storage grooves 198 located at both ends of the plurality of storage grooves 198 is 160 degrees around the central axis AX2.

[0113] like Fig.18 As shown, in the direction in which the central axis AX2 extends (left-right direction), the width W1 of the storage groove 198 is smaller than the distance between the first side surface 174b and the second side surface 174c, that is, the width W2 of the base 174. The width W1 is greater than 30% and less than 70% of the width W2. Thus, it is possible to suppress excessive reduction in the strength of the protrusions between adjacent storage grooves 198 and the overall strength of the adjustment member 160. The width W1 may also be greater than 40% and less than 60% of the width W2. Thus, it is possible to further suppress excessive reduction in the strength of the protrusions between adjacent storage grooves 198 and the overall strength of the adjustment member 160. In this embodiment, the width W1 is 50% of the width W2.

[0114] like Fig.16 and Fig.19 As shown, the first output shaft 82 includes a central portion 202, a right plate mounting portion 204, and a left plate mounting portion 206. Fig.16As shown, the right plate mounting portion 204 is arranged on the right side of the central portion 202. The right plate mounting portion 204 is located near the right end of the first output shaft 82. The right plate mounting portion 204 is inserted into the mounting portion 176 of the first adjustment member 170. The cross-section of the outer surface of the right plate mounting portion 204 has a substantially circular shape, and a part of the circle is a straight line. The diameter of the outer surface of the right plate mounting portion 204 is smaller than the diameter of the outer surface of the central portion 202. Therefore, a right step portion 208 is formed at the boundary between the right plate mounting portion 204 and the central portion 202. The cross-sectional shape of the right plate mounting portion 204 has a shape corresponding to the cross-sectional shape of the mounting portion 176 of the adjustment member 160. The right plate mounting portion 204 has a right shaft arc portion 212 and a right shaft positioning portion 214.

[0115] like Fig.17 As shown, the right shaft arc portion 212 includes a first right shaft arc portion 216, a second right shaft arc portion 218, and a third right shaft arc portion 220. The first right shaft arc portion 216, the second right shaft arc portion 218, and the third right shaft arc portion 220 are arranged separately from each other. The length of the first right shaft arc portion 216 is substantially the same as the length of the first arc portion 182. The length of the second right shaft arc portion 218 is substantially the same as the length of the second arc portion 184. The length of the third right shaft arc portion 220 is substantially the same as the length of the third arc portion 186.

[0116] The right shaft positioning portion 214 includes a first right shaft plane portion 222, a second right shaft plane portion 224, and a third right shaft plane portion 226. The first right shaft plane portion 222, the second right shaft plane portion 224, and the third right shaft plane portion 226 have a planar shape. The first right shaft plane portion 222 is connected to one end of the first right shaft arc portion 216 and one end of the second right shaft arc portion 218. The second right shaft plane portion 224 is connected to the other end of the second right shaft arc portion 218 and one end of the third right shaft arc portion 220. The third right shaft plane portion 226 is connected to the other end of the third right shaft arc portion 220 and the other end of the first right shaft arc portion 216.

[0117] The angle between the first right-axis plane portion 222 and the second right-axis plane portion 224 is substantially the same as the angle between the first plane portion 190 and the second plane portion 192. The angle between the second right-axis plane portion 224 and the third right-axis plane portion 226 is substantially the same as the angle between the second plane portion 192 and the third plane portion 194. The first right-axis plane portion 222 is substantially parallel to the third right-axis plane portion 226. The second right-axis plane portion 224 is inclined 90 degrees relative to both the first right-axis plane portion 222 and the third right-axis plane portion 226. The length of the first right-axis plane portion 222 around the central axis AX2 is substantially the same as the length of the first plane portion 190 around the center 174d. The length of the second right-axis plane portion 224 around the central axis AX2 is substantially the same as the length of the second plane portion 192 around the center 174d. The length of the third right axial flat surface portion 226 around the central axis AX2 is substantially the same as the length of the third flat surface portion 194 around the circular center 174 d .

[0118] When the right plate mounting portion 204 is inserted into the mounting portion 176 of the first adjustment member 170, the first right shaft arc portion 216 is arranged opposite to the first arc portion 182. The second right shaft arc portion 218 is arranged opposite to the second arc portion 184. The third right shaft arc portion 220 is arranged opposite to the third arc portion 186. The first right shaft plane portion 222 is arranged opposite to the first plane portion 190. The second right shaft plane portion 224 is arranged opposite to the second plane portion 192. The third right shaft plane portion 226 is arranged opposite to the third plane portion 194. By arranging the right shaft positioning portion 214 at a specific position relative to the positioning portion 180, the first adjustment member 170 is mounted in a specific posture relative to the right plate mounting portion 204. In addition, it is possible to suppress the first adjustment member 170 from being incorrectly assembled relative to the right plate mounting portion 204.

[0119] In addition, the first right shaft plane portion 222 abuts against the first plane portion 190. The second right shaft plane portion 224 abuts against the second plane portion 192. The third right shaft plane portion 226 abuts against the third plane portion 194. When a force around the central axis AX2 is applied to the first adjustment member 170 or the right plate mounting portion 204, the first right shaft plane portion 222 is pressed against the first plane portion 190, the second right shaft plane portion 224 is pressed against the second plane portion 192, and the third right shaft plane portion 226 is pressed against the third plane portion 194. Thus, the first adjustment member 170 is prevented from rotating relative to the right plate mounting portion 204 around the central axis AX2.

[0120] like Fig.19As shown, the left plate mounting portion 206 is arranged on the left side of the central portion 202. The left plate mounting portion 206 is located near the left end of the first output shaft 82. The left plate mounting portion 206 is inserted into the mounting portion 176 of the second adjustment member 172. The cross-section of the outer surface of the left plate mounting portion 206 has a substantially circular shape, and a part of the circle is a straight line. The diameter of the outer surface of the left plate mounting portion 206 is smaller than the diameter of the outer surface of the central portion 202. Therefore, a left step portion 230 is formed at the junction between the left plate mounting portion 206 and the central portion 202. The cross-sectional shape of the left plate mounting portion 206 has a shape corresponding to the cross-sectional shape of the mounting portion 176 of the adjustment member 160. In addition, the cross-sectional shape of the left plate mounting portion 206 and the cross-sectional shape of the right plate mounting portion 204 are plane-symmetrical with respect to a plane orthogonal to the central axis AX2. That is, the left plate mounting portion 206 has a left shaft arc portion 232 and a left shaft positioning portion 234. In addition, as shown Fig. 20 As shown, the left shaft arc portion 232 includes a first left shaft arc portion 236 , a second left shaft arc portion 238 , and a third left shaft arc portion 240 . Also, the left shaft positioning portion 234 includes a first left shaft flat surface portion 242 , a second left shaft flat surface portion 244 , and a third left shaft flat surface portion 246 .

[0121] When the left plate mounting portion 206 is inserted into the mounting portion 176 of the second adjustment member 172, the first left shaft arc portion 236 is arranged opposite to the first arc portion 182. The second left shaft arc portion 238 is arranged opposite to the second arc portion 184. The third left shaft arc portion 240 is arranged opposite to the third arc portion 186. The first left shaft plane portion 242 is arranged opposite to the first plane portion 190. The second left shaft plane portion 244 is arranged opposite to the second plane portion 192. The third left shaft plane portion 246 is arranged opposite to the third plane portion 194. By arranging the left shaft positioning portion 234 at a specific position relative to the positioning portion 180, the second adjustment member 172 is mounted in a specific posture relative to the left plate mounting portion 206. In addition, it is possible to suppress the erroneous assembly of the second adjustment member 172 relative to the left plate mounting portion 206.

[0122] In addition, the first left shaft plane portion 24 abuts against the first plane portion 190. The second left shaft plane portion 244 abuts against the second plane portion 192. The third left shaft plane portion 246 abuts against the third plane portion 194. When a force around the central axis AX2 is applied to the second adjustment member 172 or the left plate mounting portion 206, the first plane portion 190 is pressed against the first left shaft plane portion 242, the second plane portion 192 is pressed against the second left shaft plane portion 244, and the third plane portion 194 is pressed against the third left shaft plane portion 246. Thus, the second adjustment member 172 can be prevented from rotating relative to the left plate mounting portion 206 around the central axis AX2.

[0123] In addition, the cross-sectional shape of the left plate mounting portion 206 is plane-symmetrical with respect to a plane orthogonal to the central axis AX2. Therefore, the mounting posture of the first adjustment member 170 and the mounting posture of the second adjustment member 172 relative to the first output shaft 82 are substantially the same.

[0124] like Fig.21 As shown, the right mounting portion 120 of the blade 86 includes a right circular plate portion 250 , a right peripheral wall portion 252 , and a plurality of (five in this embodiment) right protrusions 254 .

[0125] The right circular plate portion 250 has a roughly circular plate shape. The right circular plate portion 250 includes an outer peripheral surface 256, a first side surface 258, and a second side surface 260. The outer peripheral surface 256 has a circular shape. The circle center 256a of the outer peripheral surface 256 is arranged on the central axis AX2. The outer peripheral surface 256 connects the periphery of the first side surface 258 and the periphery of the second side surface 260. The first side surface 258 is a surface on the side opposite to the second side surface 260. The right circular plate portion 250 has an insertion hole 262. The insertion hole 262 penetrates the right circular plate portion 250 in the left-right direction from the first side surface 258 to the second side surface 260. The center of the cross section of the insertion hole 262 is arranged on the circle center 256a of the outer peripheral surface 256. The right plate mounting portion 204 (refer to Fig. 9 ). At this time, the first side surface 258 and the first side surface 174b of the first adjustment member 170 (see Fig.16 )relatively.

[0126] The right peripheral wall portion 252 protrudes leftward from the peripheral edge of the first side surface 258. The right peripheral wall portion 252 goes around the peripheral edge of the first side surface 258. The right peripheral wall portion 252 has a substantially cylindrical shape.

[0127] The right protrusion 254 has a substantially trapezoidal shape and protrudes from the inner peripheral surface of the right peripheral wall portion 252 toward the central axis AX2 inward in the radial direction of the right disk portion 250 . The right protrusion 254 is connected to the first side surface 258 .

[0128] The plurality of right protrusions 254 are arranged at equal intervals around the central axis AX2. Adjacent right protrusions 254 are separated. The plurality of right protrusions 254 are arranged on a portion of the entire circumference of the inner circumference of the right peripheral wall portion 252 around the central axis AX2. Fig.17As shown, the intervals between adjacent right protrusions 254 around the central axis AX2 are substantially the same as the intervals between adjacent receiving grooves 198 around the central axis AX2. The right protrusions 254 are received in the receiving grooves 198. At this time, the first adjustment member 170 is arranged inside the right peripheral wall portion 252. The number of the plurality of right protrusions 254 is less than the number of the plurality of receiving grooves 198. Therefore, the installation posture of the right mounting portion 120 relative to the first adjustment member 170 is adjusted by changing the arrangement of the plurality of right protrusions 254 relative to the plurality of receiving grooves 198.

[0129] like Fig. 9 As shown in FIG. 1 , the right mounting portion 120 is mounted on the first adjusting member 170 from the right side. The right mounting portion 120, the first adjusting member 170, and the other end of the right connecting portion 118 are sandwiched between the bolt 126 and the right step portion 208 outside the front housing 40. Thus, the mounting posture of the right mounting portion 120 relative to the first adjusting member 170 is fixed. In addition, the bolt 126 abuts against the right mounting portion 120, the first adjusting member 170, and the other end of the right connecting portion 118. Thus, the right mounting portion 120, the first adjusting member 170, and the other end of the right connecting portion 118 can be prevented from coming off from the right plate mounting portion 204.

[0130] like Fig. 22 As shown in FIG. 1 , the shape of the left mounting portion 124 of the blade 86 is plane-symmetrical with respect to the plane orthogonal to the central axis AX2. That is, the left mounting portion 124 includes a left circular plate portion 270, a left peripheral wall portion 272, and a plurality of (five in this embodiment) left protrusions 274. The number of the plurality of left protrusions 274 is the same as the number of the plurality of right protrusions 254 (see FIG. 1 ). Fig.21 ) are the same in number. The left circular plate portion 270 includes an outer peripheral surface 276, a first side surface 278, and a second side surface 280. The left circular plate portion 270 has an insertion hole 282. The center of the cross section of the insertion hole 282 is arranged on the circle center 276a of the outer peripheral surface 276. Fig. 20 As shown, the left protrusion 274 is received in the receiving groove 198. Therefore, by changing the arrangement of the plurality of left protrusions 274 with respect to the plurality of receiving grooves 198, the mounting posture of the left mounting portion 124 with respect to the second adjustment member 172 is adjusted.

[0131] like Fig. 9As shown in FIG. 1 , the left mounting portion 124 is mounted on the second adjusting member 172 from the left side. The left mounting portion 124, the second adjusting member 172, and the other end of the left connecting portion 122 are sandwiched between the bolt 130 and the left step portion 230 outside the front end housing 40. Thus, the mounting posture of the left mounting portion 124 relative to the second adjusting member 172 is fixed. In addition, the bolt 130 abuts against the left mounting portion 124, the second adjusting member 172, and the other end of the left connecting portion 122. Thus, the left mounting portion 124, the second adjusting member 172, and the other end of the left connecting portion 122 can be prevented from coming off from the left plate mounting portion 206.

[0132] like Fig.23 As shown, the operating machine 2 further includes a blade cover 300. The blade cover 300 is formed of a resin material. The blade cover 300 is mounted on the blade 86. The blade cover 300 covers the blade portion 116 of the blade 86. Thus, for example, it is possible to prevent the blade portion 116 from coming into contact with the user during the storage of the operating machine 2 or the transportation of the operating machine 2. In addition, the blade cover 300 is configured separately from the front end housing 40. In the following, the coordinate system is changed to the following coordinate system for explanation. Specifically, the longitudinal direction of the blade portion 116 is referred to as the left-right direction, the direction orthogonal to the left-right direction is referred to as the front-back direction, and the direction extending in the left-right direction and the front-back direction is referred to as the up-down direction. The blade portion 116 is configured along a plane including the left-right direction and the front-back direction.

[0133] The blade cover 300 extends in the left-right direction. The cross-sectional shape of the blade cover 300 is substantially the same in the left-right direction. Therefore, the blade cover 300 is manufactured, for example, by extrusion molding. Fig.24 As shown, when the blade cover 300 is mounted on the blade portion 116 , the lower surface of the blade portion 116 is substantially parallel to the ground G. The blade cover 300 includes a cover portion 302 , a contact portion 304 , a guide portion 306 , a release portion 308 , and a friction force imparting portion 310 .

[0134] The cover portion 302 covers the blade portion 116. The cover portion 302 includes a first cover portion 314 and a second cover portion 316. The first cover portion 314 is arranged at a position closer to the front side than the second cover portion 316. The first cover portion 314 is arranged separately from the second cover portion 316 in the front-to-back direction. The first cover portion 314 and the second cover portion 316 are arranged opposite to each other in the front-to-back direction. The first cover portion 314 extends from the lower end toward the upper side in the front. The second cover portion 316 extends from the lower end toward the upper side in the rear. Therefore, the distance between the first cover portion 314 and the second cover portion 316 in the front-to-back direction increases from the lower end toward the upper end. The maximum distance between the first cover portion 314 and the second cover portion 316 in the front-to-back direction is longer than the length of the blade portion 116 in the front-to-back direction. The first cover portion 314 covers a plurality of blade tips 116a at the front end of the blade portion 116. The second cover portion 316 covers the plurality of blade edges 116 a at the rear end of the blade portion 116 .

[0135] The abutment portion 304 is arranged on the upper side of the blade portion 116. The abutment portion 304 includes a first abutment portion 320 and a second abutment portion 322. The first abutment portion 320 is arranged on the upper side of the plurality of blade tips 116a at the front end of the blade portion 116. The second abutment portion 322 is arranged on the upper side of the plurality of blade tips 116a at the rear end of the blade portion 116. The first abutment portion 320 is arranged at a position closer to the front side than the second abutment portion 322. The first abutment portion 320 is connected to the upper end of the first cover portion 314. The second abutment portion 322 is connected to the upper end of the second cover portion 316. The first abutment portion 320 is arranged separately from the second abutment portion 322 in the front-to-back direction. The first abutment portion 320 is arranged opposite to the second abutment portion 322 in the front-to-back direction. The first abutment portion 320 extends from the lower end toward the rear upper side. The second abutment portion 322 extends from the lower end toward the front upper side. Therefore, the distance in the front-to-back direction between the first abutment portion 320 and the second abutment portion 322 decreases as it moves from the lower end toward the upper end. The minimum distance in the front-to-back direction between the first abutment portion 320 and the second abutment portion 322 is shorter than the length in the front-to-back direction of the blade portion 116. For the first abutment portion 320 and the second abutment portion 322, the blade portion 116 abuts against the first abutment portion 320 and the second abutment portion 322 when moving upward relative to the blade cover 300. Thus, the state in which the cover portion 302 covers the blade portion 116 can be maintained.

[0136] The guide portion 306 includes a first guide portion 326, a second guide portion 328, a first bending portion 330, and a second bending portion 332. The first guide portion 326 is disposed at a position closer to the front side than the second guide portion 328. The first guide portion 326 is connected to the upper end of the first abutting portion 320. The second guide portion 328 is connected to the upper end of the second abutting portion 322. The first guide portion 326 is disposed separately from the second guide portion 328 in the front-to-back direction. The first guide portion 326 is disposed opposite to the second guide portion 328 in the front-to-back direction. The first guide portion 326 extends from the lower end toward the upper front side. The second guide portion 328 extends from the lower end toward the upper rear side. Therefore, the distance between the first guide portion 326 and the second guide portion 328 in the front-to-back direction gradually increases from the lower end toward the upper end.

[0137] The first bent portion 330 is connected to the upper end of the first guide portion 326. The second bent portion 332 is connected to the upper end of the second guide portion 328. The first bent portion 330 extends from the upper end of the first guide portion 326 toward the lower front side and then bends to extend toward the lower rear side. The second bent portion 332 extends from the upper end of the second guide portion 328 toward the lower rear side and then bends to extend toward the lower front side. Thus, it is possible to prevent the user from touching the end of the guide portion 306.

[0138] The release portion 308 is elastically deformable. The release portion 308 includes a first operating portion 336, a second operating portion 338, a first loading portion 340, a second loading portion 342, a third guide portion 344, a fourth guide portion 346, and a mounting portion 348. The first operating portion 336 is disposed at a position closer to the front side than the second operating portion 338. The first operating portion 336 is connected to the lower end of the first cover portion 314. The second operating portion 338 is connected to the lower end of the second cover portion 316. The first operating portion 336 is disposed separately from the second operating portion 338 in the front-to-back direction. The first operating portion 336 extends from the upper end toward the front lower side. The second operating portion 338 extends from the upper end toward the rear lower side. Therefore, the distance between the first operating portion 336 and the second operating portion 338 in the front-to-back direction increases from the upper end toward the lower end.

[0139] The first carrier portion 340 and the second carrier portion 342 have a flat plate shape. The first carrier portion 340 is arranged at a position closer to the front side than the second carrier portion 342. The first carrier portion 340 is connected to the lower end of the first operating portion 336. The second carrier portion 342 is connected to the lower end of the second operating portion 338. The first carrier portion 340 is arranged separately from the second carrier portion 342 in the front-to-back direction. The first carrier portion 340 extends from the lower end of the first operating portion 336 in the rear direction. The second carrier portion 342 extends from the lower end of the second operating portion 338 in the front direction. The first carrier portion 340 and the second carrier portion 342 are arranged on the same plane. When the blade cover 300 is placed on the ground G, the first carrier portion 340 and the second carrier portion 342 are in contact with the ground G. The first carrier portion 340 and the second carrier portion 342 are roughly parallel to the ground G. The first placement portion 340 and the second placement portion 342 are in surface contact with the ground surface G. Therefore, the blade cover 300 on the ground surface G can be prevented from falling down.

[0140] The third guide portion 344 is arranged at a position closer to the front side than the fourth guide portion 346. The third guide portion 344 is connected to the rear end of the first loading portion 340. The fourth guide portion 346 is connected to the front end of the second loading portion 342. The third guide portion 344 is arranged separately from the fourth guide portion 346 in the front-to-back direction. The third guide portion 344 is arranged opposite to the fourth guide portion 346 in the front-to-back direction. The third guide portion 344 extends from the rear end of the first loading portion 340 toward the rear upper side. The fourth guide portion 346 extends from the front end of the second loading portion 342 toward the front upper side. The distance between the third guide portion 344 and the fourth guide portion 346 in the front-to-back direction gradually decreases from the lower end toward the upper end.

[0141] The mounting portion 348 is connected to the upper end of the third guide portion 344 and the upper end of the fourth guide portion 346. The mounting portion 348 includes a first mounting portion 350, a second mounting portion 352, and a third mounting portion 354. The first mounting portion 350 is arranged at a position closer to the front side than the second mounting portion 352. The first mounting portion 350 is connected to the upper end of the third guide portion 344. The second mounting portion 352 is connected to the upper end of the fourth guide portion 346. The first mounting portion 350 is arranged to be separated from the second mounting portion 352 in the front-to-back direction. The first mounting portion 350 is arranged to be opposite to the second mounting portion 352 in the front-to-back direction. The first mounting portion 350 extends from the lower end toward the upper front side and then bends and extends toward the upper rear side. The second mounting portion 352 extends from the lower end toward the upper rear side and then bends and extends toward the upper front side.

[0142] The third mounting portion 354 connects the upper end of the first mounting portion 350 and the upper end of the second mounting portion 352. The third mounting portion 354 extends substantially in the front-rear direction. The third mounting portion 354 is substantially parallel to the ground G and the lower surface of the blade portion 116. The third mounting portion 354 has an insertion hole 356. The insertion hole 356 penetrates the third mounting portion 354 in the thickness direction (up-down direction). Fig.25 As shown, the insertion hole 356 is arranged at the center of the third mounting portion 354 in the longitudinal direction.

[0143] The friction force imparting part 310 is formed of, for example, an elastic material. The friction force imparting part 310 is, for example, friction rubber. The friction force imparting part 310 is inserted into the insertion hole 356. The friction force imparting part 310 is fixed to the third mounting part 354. The friction force imparting part 310 protrudes upward from the insertion hole 356 and protrudes downward from the insertion hole 356.

[0144] When the blade cover 300 is mounted on the blade portion 116, the upper portion of the friction force imparting portion 310 abuts against the lower surface of the blade portion 116. When a force causing the blade cover 300 to slide in the left direction relative to the blade portion 116 is applied to the blade portion 116 or the blade cover 300, the friction force imparting portion 310 applies a friction force in the right direction relative to the blade portion 116 (a friction force in the direction opposite to the left direction) to the blade portion 116. In addition, when a force causing the blade cover 300 to slide in the right direction relative to the blade portion 116 is applied to the blade portion 116 or the blade cover 300, the friction force imparting portion 310 applies a friction force in the left direction relative to the blade portion 116 (a friction force in the direction opposite to the right direction) to the blade portion 116. Thus, the blade cover 300 can be prevented from sliding in the left-right direction relative to the blade portion 116. Therefore, for example, the blade cover 300 can be prevented from sliding in the left-right direction relative to the blade portion 116 due to its own weight, thereby preventing the blade cover 300 from falling off the blade portion 116. In addition, the blade cover 300 can be prevented from shaking relative to the blade portion 116.

[0145] The blade cover 300 of this embodiment can be installed on the blade portion 116 using three methods. Fig.26 As shown, the user holds the working machine 2 with the blade cover 300 placed on the ground G (see Fig.24 ) so that the blade portion 116 moves downward from the upper side of the first guide portion 326 and the second guide portion 328. As a result, the blade cover 300 is elastically deformed so that the first guide portion 326 and the second guide portion 328 move away from each other in the front-to-back direction. That is, the first guide portion 326 moves from the initial position to the separation direction D5, and the second guide portion 328 moves from the initial position to the separation direction D6 opposite to the separation direction D5. As a result, the first abutting portion 320 and the second abutting portion 322 move away from each other in the front-to-back direction. If the user moves the blade portion 116 to a position lower than the lower end of the first guide portion 326 and the lower end of the second guide portion 328, the first guide portion 326 and the second guide portion 328 approach each other in the front-to-back direction due to the elastic restoring force of the blade cover 300. The first guide portion 326 moves to the initial position in the direction opposite to the separation direction D5, and the second guide portion 328 moves to the initial position in the direction opposite to the separation direction D6. Thus, the first abutment portion 320 and the second abutment portion 322 are close to each other in the front-rear direction, and the first abutment portion 320 and the second abutment portion 322 are arranged on the upper side of the blade tip 116a of the blade portion 116. The user can easily mount the blade cover 300 on the blade portion 116 by a simple operation of pressing the blade portion 116 toward the blade cover 300 from the upper side.

[0146] In addition, the user holds the blade cover 300 and applies the force of the elastic restoring force of the resisting release part 308 to the release part 308. Specifically, the user operates the first operating part 336 and the second operating part 338 in the direction in which the first operating part 336 and the second operating part 338 are close to each other. Through the elastic deformation of the release part 308, the first operating part 336 moves from the initial position to the approach direction D7, and the second operating part 338 moves from the initial position to the approach direction D8 opposite to the approach direction D7. Along with the movement of the first operating part 336 and the second operating part 338, the first guide part 326 moves from the initial position to the separation direction D5, and the second guide part 328 moves from the initial position to the separation direction D6 opposite to the separation direction D5. Thus, the first abutting part 320 and the second abutting part 322 are away from each other in the front-back direction. Then, the user moves the blade cover 300 upward relative to the blade part 116. Thus, the user can attach the blade cover 300 to the blade portion 116 by a simple operation of operating the first operation portion 336 and the second operation portion 338 .

[0147] Moreover, if Fig. 27As shown, if the user holds the blade cover 300 by hand and moves the blade cover 300 to the left (or right) direction relative to the blade portion 116 in a manner close to the blade portion 116, the blade portion 116 moves to the left (or right) direction between the cover portion 302 and the abutment portion 304. Thus, the user can easily attach the blade cover 300 to the blade portion 116 by a simple operation of sliding the blade cover 300 relative to the blade portion 116 in the left-right direction.

[0148] In addition, the blade cover 300 of this embodiment can be removed from the blade portion 116 by two methods. Fig.24 As shown, the user holds the blade cover 300 and applies the force resisting the elastic restoring force of the release portion 308 to the release portion 308. Specifically, the user operates the first operating portion 336 and the second operating portion 338 in the direction in which the first operating portion 336 and the second operating portion 338 approach each other. Through the elastic deformation of the release portion 308, the first operating portion 336 moves from the initial position to the approach direction D7, and the second operating portion 338 moves from the initial position to the approach direction D8 opposite to the approach direction D7. Along with the movement of the first operating portion 336 and the second operating portion 338, the first guide portion 326 moves from the initial position to the separation direction D5, and the second guide portion 328 moves from the initial position to the separation direction D6 opposite to the separation direction D5. Thus, the first abutting portion 320 and the second abutting portion 322 are separated from each other in the front-rear direction. Next, if the user moves the blade portion 116 upward relative to the blade cover 300, the blade cover 300 is removed from the blade portion 116. Thus, the user can remove the blade cover 300 from the blade portion 116 by a simple operation of operating the first operating portion 336 and the second operating portion 338 .

[0149] In addition, if Fig. 27 As shown, the user holds the blade cover 300 by hand while the blade cover 300 is mounted on the blade portion 116, and moves the blade cover 300 to the left (or right) direction relative to the blade portion 116. The user can easily remove the blade cover 300 from the blade portion 116 by a simple operation of sliding the blade cover 300 in the left-right direction relative to the blade portion 116.

[0150] In addition, the blade cover 300 of this embodiment can be mounted on the rod 4 of the working machine 2. Fig.28As shown, the shortest distance between the third guide portion 344 and the fourth guide portion 346 in the front-to-back direction is shorter than the diameter of the rod 4. If the user holds the blade cover 300 and moves the third guide portion 344 and the fourth guide portion 346 from the upper side of the rod 4 to the lower direction, the release portion 308 is elastically deformed and the third guide portion 344 and the fourth guide portion 346 move away from each other in the front-to-back direction. That is, the third guide portion 344 moves from the initial position to the separation direction D9, and the fourth guide portion 346 moves from the initial position to the separation direction D10 opposite to the separation direction D9. If the rod 4 moves into the mounting portion 348, the third guide portion 344 and the fourth guide portion 346 approach each other in the front-to-back direction due to the elastic restoring force of the release portion 308. The third guide portion 344 moves toward the initial position in the direction opposite to the separation direction D9, and the fourth guide portion 346 moves toward the initial position in the direction opposite to the separation direction D10. The user can easily attach the blade cover 300 to the rod 4 by a simple operation.

[0151] like Fig.29 As shown, when the blade cover 300 is mounted on the rod 4, the mounting portion 348 surrounds the rod 4. The mounting portion 348 is pressed against the rod 4 by the elastic restoring force of the release portion 308. Thus, the blade cover 300 can be prevented from falling off from the rod 4.

[0152] (Effect)

[0153] The working machine 2 of this embodiment includes: a front end housing 40 (an example of a housing); a blade 86 (an example of a working member) supported by the front end housing 40 in a swingable manner and at least partially arranged outside the front end housing 40; and a counterweight 88 arranged inside the front end housing 40 and swinging when the blade 86 swings. The blade 86 and the counterweight 88 swing so as to approach and move away from each other.

[0154] According to the above configuration, the vibration of the front end housing 40 caused by the swing of the blade 86 can be offset by the vibration of the front end housing 40 caused by the swing of the counterweight 88. As a result, the vibration of the front end housing 40 can be reduced.

[0155] The working machine 2 further includes a motor 20 (an example of a prime mover) and a transmission mechanism 90 disposed inside the front housing 40. The transmission mechanism 90 includes a rotating member 91 that rotates around the rotation axis AX1 by the operation of the motor 20, a first transmission unit 78 that is mounted on the rotating member 91 and transmits the rotation of the rotating member 91 to the blade 86, and a second transmission unit 80 that is mounted on the rotating member 91 and transmits the rotation of the rotating member 91 to the counterweight 88.

[0156] According to the above-mentioned structure, both the first transmission unit 78 and the second transmission unit 80 can be operated by the operation of one rotating member 91. Thus, the number of parts can be reduced.

[0157] The first transmission unit 78 includes a first rod 100 attached to the rotating member 91. The second transmission unit 80 includes a third rod 136 (an example of a second rod) attached to the rotating member 91. When the working machine 2 is viewed along the rotation axis AX1, the first rod 100 and the third rod 136 at least partially overlap.

[0158] In the structure in which the first rod 100 does not at least partially overlap the third rod 136 when the working machine 2 is observed along the rotation axis AX1, the working machine 2 is enlarged in the direction orthogonal to the rotation axis AX1. According to the above structure, the first rod 100 at least partially overlaps the third rod 136 when the working machine 2 is observed along the rotation axis AX1, so that the working machine 2 can be suppressed from being enlarged in the direction orthogonal to the rotation axis AX1.

[0159] In addition, the first transmission unit 78 further includes: a first connection spindle 102 (an example of the first spindle); and a second rod 104 (an example of the third rod), which is movably mounted on the first rod 100 via the first connection spindle 102, and transmits the movement of the first rod 100 to the blade 86. The second transmission unit 80 further includes: a second connection spindle 138 (an example of the second spindle); and a fourth rod 140, which is movably mounted on the third rod 136 via the second connection spindle 138, and transmits the movement of the third rod 136 to the counterweight 88.

[0160] According to the above configuration, the first transmission unit 78 includes the second rod 104, and can easily adjust the position of the central axis AX2 of the blade 86. In addition, the second transmission unit 80 includes the fourth rod 140, and can easily adjust the position of the central axis AX3 of the weight 88.

[0161] In addition, the working machine 2 also has: a first output shaft 82, which connects the first transmission unit 78 and the blade 86 and extends on the center axis AX2 (an example of a swing axis) of the blade 86; and a second output shaft 84, which connects the second transmission unit 80 and the counterweight 88 and extends on the center axis AX3 (an example of a swing axis) of the counterweight 88.

[0162] According to the above structure, the position of the blade 86 relative to the first transmission unit 78 can be easily adjusted by the first output shaft 82 in the direction in which the central axis AX2 of the blade 86 extends. In addition, the position of the counterweight 88 relative to the second transmission unit 80 can be easily adjusted by the second output shaft 84 in the direction in which the central axis AX3 of the counterweight 88 extends.

[0163] In addition, the distance between the rotation axis AX1 of the rotation member 91 and the central axis AX2 of the blade 86 is substantially the same as the distance between the rotation axis AX1 of the rotation member 91 and the central axis AX3 of the weight 88 .

[0164] According to the above configuration, the vibration of the front end housing 40 caused by the swing of the counterweight 88 can be used to further cancel the vibration of the front end housing 40 caused by the swing of the blade 86. As a result, the vibration of the front end housing 40 can be further reduced.

[0165] In addition, the blade 86 includes a first portion 128 and a second portion 132 supported by the front end housing 40. The first portion 128 and the second portion 132 are arranged on the central axis AX2 of the blade 86. In the direction along the central axis AX2 of the blade 86, the counterweight 88 is arranged between the first portion 128 and the second portion 132.

[0166] In the structure in which the counterweight 88 is not disposed between the first part 128 and the second part 132 in the direction along the central axis AX2 of the blade 86, the blade 86 sometimes tilts due to the deadweight of the counterweight 88. According to the above structure, in the direction along the central axis AX2 of the blade 86, the counterweight 88 is disposed between the first part 128 and the second part 132, and therefore, the blade 86 can be suppressed from tilting due to the deadweight of the counterweight 88.

[0167] The working machine 2 also includes a rod 4 that is fixed to the front end housing 40 and extends in the longitudinal direction, and a ring handle 6 (an example of a handle) that is fixed to the rod 4 and is gripped by a user.

[0168] According to the above structure, the user controls the lever-type working machine 2 by holding the ring handle 6. If the front end housing 40 vibrates due to the swing of the blade 86, the operability of the lever-type working machine 2 deteriorates due to the vibration of the front end housing 40. According to the above structure, the vibration of the front end housing 40 caused by the swing of the blade 86 is offset by the vibration of the front end housing 40 caused by the swing of the counterweight 88, so that the operability of the lever-type working machine 2 can be suppressed from being deteriorated.

[0169] Additionally, blade 86 digs the ground.

[0170] According to the above structure, the front end housing 40 vibrates due to the blade 86 digging the ground. Therefore, the vibration caused by the swing of the blade 86 and the vibration caused by the blade 86 digging the ground are generated in the front end housing 40. As a result, the front end housing 40 vibrates greatly. According to the above structure, the vibration of the front end housing 40 caused by the swing of the counterweight 88 can be used to offset the vibration of the front end housing 40 caused by the swing of the blade 86. As a result, the vibration of the front end housing 40 can be reduced.

[0171] In addition, the working machine 2 includes: a front end unit 10 (an example of a blade unit) including a blade 86 provided with a blade portion 116; and a blade cover 300 which can be mounted on the front end unit 10. The blade portion 116 extends in the left direction (an example of the first direction) and is arranged along the ground G (an example of the first plane) including the left direction. The blade cover 300 includes: a cover portion 302 which covers the blade portion 116 when the blade cover 300 is mounted on the front end unit 10; a contact portion 304 which contacts the front end unit 10 in an upward direction (an example of the second direction) orthogonal to the ground G when the blade cover 300 is mounted on the front end unit 10, and maintains the blade cover 300 in a state where the cover portion 302 covers the blade portion 116; and a release portion 308 which can be elastically deformed and releases the contact between the contact portion 304 in the upward direction and the front end unit 10 when a force resisting the elastic restoring force of the release portion 308 is applied to the release portion 308.

[0172] According to the above configuration, when the user applies a force resisting the elastic restoring force of the release portion 308 to the release portion 308, the contact between the contact portion 304 and the front end unit 10 is released upward.

[0173] In addition, the blade cover 300 can slide relative to the front end unit 10 in the left direction when the contact portion 304 contacts the front end unit 10 in the upper direction, and can be attached to and detached from the front end unit 10 by sliding relative to the front end unit 10 in the left direction.

[0174] According to the above-described configuration, the blade cover 300 can be attached to and detached from the front end unit 10 by a simple operation of sliding the blade cover 300 relative to the front end unit 10 .

[0175] In addition, the blade cover 300 also has a friction force applying portion 310, which can abut against the blade portion 116 and apply friction force in the right direction (an example of the third direction) opposite to the left direction to the blade portion 116 when the blade cover 300 slides to the left relative to the front end unit 10.

[0176] According to the above-described configuration, the vibration of the blade cover 300 can be suppressed by applying the frictional force between the frictional force applying portion 310 and the blade portion 116 .

[0177] In addition, the cross-sectional shape of the cover portion 302 and the cross-sectional shape of the contact portion 304 are substantially the same in the left direction.

[0178] According to the above-mentioned structure, the blade cover 300 can be easily manufactured by a simple manufacturing method such as extrusion molding.

[0179] The working machine 2 further includes a rod 4 that is fixed to the front end unit 10 and extends in the longitudinal direction. The release portion 308 includes a mounting portion 348 that can be mounted on the rod 4 and surrounds the rod 4 when mounted on the rod 4.

[0180] According to the above-mentioned structure, the blade cover 300 can be attached to the rod 4 when working with the working machine 2. Thereby, it can be suppressed that the blade cover 300 is lost when working with the working machine 2.

[0181] In addition, the release portion 308 includes a first operating portion 336 and a second operating portion 338, which are separately arranged in the front direction (an example of the fourth direction) orthogonal to the left direction and the upper direction for operation by the user. The contact portion 304 includes a first contact portion 320 and a second contact portion 322 separately arranged in the front direction. When the first operating portion 336 and the second operating portion 338 are operated in a manner such that the first operating portion 336 and the second operating portion 338 are close to each other, the first contact portion 320 and the second contact portion 322 move in a direction away from each other and separate from the front end unit 10.

[0182] According to the above-described configuration, the user can easily remove the blade cover 300 from the front end unit 10 by operating the release portion 308 so that the first operating portion 336 and the second operating portion 338 are brought closer to each other.

[0183] Furthermore, the release portion 308 comes into contact with the ground G when the working machine 2 is placed on the ground G (an example of a placement surface) in a state where the blade cover 300 is attached to the front end unit 10 .

[0184] According to the above-described configuration, when the working machine 2 is placed on the ground G, the releasing portion 308 is brought into contact with the ground G, so that the working machine 2 can be arranged in a specific posture relative to the ground G.

[0185] The front end unit 10 includes a front end housing 40 (an example of a housing). When the blade cover 300 is mounted on the front end unit 10, the contact portion 304 may be separated from the front end housing 40 and contact the blade portion 116 upward.

[0186] According to the above structure, the blade cover is directly attached to the blade portion. Thus, the blade cover can be miniaturized.

[0187] (Variation Example)

[0188] The working machine 2 according to one embodiment may be a working machine other than a lawn mower, for example, a lawn mower, a reciprocating saw, a hedge trimmer, a floor trimmer, or a broom.

[0189] The working machine 2 according to one embodiment may include a prime mover other than the motor 20 , such as an engine.

[0190] The blade cover 300 according to one embodiment may be attached to the front end housing 40 to cover the blade portion 116 .

[0191] The cross-sectional shape of the blade cover 300 according to one embodiment may not be substantially the same in the left-right direction.

[0192] In the working machine 2 of the embodiment, the positioning portion 180 of the adjustment member 160 includes three planar portions 190, 192, and 194. In a modified example, the number of planar portions is not limited to three, and may be two, or may be four or more and twelve or less.

[0193] In the working machine 2 of one embodiment, the adjustment member 160 may include a protrusion instead of the storage groove 198. In this case, the right mounting portion 120 and the left mounting portion 124 of the blade 86 may include a storage groove instead of the protrusions 254 and 274.

Claims

1. A working machine, wherein: The operating machine has: a housing; and an operating member supported by the housing in a swingable manner and at least partially arranged outside the housing; a counterweight disposed inside the housing and swung when the working member swung; The working member and the counterweight swing so as to approach and move away from each other.

2. The working machine according to claim 1, wherein: The working machine further comprises: prime mover; and A transmission mechanism is arranged inside the housing, The transmission mechanism comprises: a rotating member that is rotated about a rotation axis by the action of the prime mover; a first transmission unit, which is mounted on the rotating member and transmits the rotation of the rotating member to the working member; as well as The second transmission unit is attached to the rotating member and transmits the rotation of the rotating member to the counterweight.

3. The working machine according to claim 2, wherein: The first transmission unit includes a first rod mounted on the rotating member. The second transmission unit includes a second rod mounted on the rotating member. When the working machine is viewed along the rotation axis, the first rod and the second rod at least partially overlap.

4. The working machine according to claim 3, wherein: The first transmission unit further comprises: 1st main axis; and a third rod, which is movably mounted on the first rod via the first spindle and transmits the movement of the first rod to the working member; The second transmission unit further comprises: The second axis; and The fourth rod is movably mounted on the second rod via the second main shaft, and transmits the movement of the second rod to the counterweight.

5. The working machine according to any one of claims 2 to 4, wherein: The working machine further comprises: a first output shaft connecting the first transmission unit and the working member and extending on a swing axis of the working member; and A second output shaft connects the second transmission unit and the counterweight and extends on a swing axis of the counterweight.

6. The working machine according to any one of claims 2 to 5, wherein: The distance between the rotation axis of the rotating member and the swing axis of the working member is substantially the same as the distance between the rotation axis of the rotating member and the swing axis of the counterweight.

7. The working machine according to any one of claims 1 to 6, wherein: The working member includes a first portion and a second portion supported by the housing, The first portion and the second portion are arranged on a swing axis of the working member. The counterweight is disposed between the first portion and the second portion in a direction along the swing axis of the working member.

8. The working machine according to any one of claims 1 to 7, wherein: The working machine further comprises: a rod fixed to the housing and extending in a length direction; and A handle is fixed to the rod for the user to hold.

9. The working machine according to any one of claims 1 to 8, wherein: The working member includes a blade for digging the ground.

10. The working machine according to any one of claims 1 to 9, wherein: The working machine comprises: a blade unit including the working member provided with a blade portion; as well as a blade cover which can be mounted on the blade unit, The blade portion extends in a first direction and is arranged along a first plane including the first direction. The blade cover comprises: a cover portion that covers the blade portion when the blade cover is mounted on the blade unit; an abutting portion that abuts against the blade unit in a second direction orthogonal to the first plane when the blade cover is mounted on the blade unit, and maintains the blade cover in a state where the cover portion covers the blade portion; and The releasing portion is elastically deformable and releases the contact between the contact portion and the blade unit in the second direction when a force resisting the elastic restoring force of the releasing portion is applied to the releasing portion.

11. The working machine according to claim 10, wherein: The blade cover can slide relative to the blade unit in the first direction in a state where the contact portion contacts the blade unit in the second direction, and can be attached to and detached from the blade unit by sliding relative to the blade unit in the first direction.

12. The working machine according to claim 11, wherein: The blade cover further includes a friction force imparting portion that can abut against the blade portion and impart a friction force in a third direction opposite to the first direction to the blade portion when the blade cover slides relative to the blade unit in the first direction.

13. The working machine according to claim 11 or 12, wherein: The cross-sectional shape of the cover portion and the cross-sectional shape of the contact portion are substantially the same in the first direction.

14. The working machine according to any one of claims 10 to 13, wherein: The working machine further includes a rod, the rod being fixed to the blade unit and extending in a longitudinal direction. The release portion includes a mounting portion that can be mounted on the rod and surrounds the rod when mounted on the rod.

15. The working machine according to any one of claims 10 to 14, wherein: The release portion includes a first operating portion and a second operating portion, and the first operating portion and the second operating portion are separately arranged in a fourth direction orthogonal to the first direction and the second direction for operation by a user. The contact portion includes a first contact portion and a second contact portion which are arranged to be separated from each other in the fourth direction. When the first operating portion and the second operating portion are operated so as to approach each other, the first contact portion and the second contact portion move in directions away from each other and separate from the blade unit.

16. The working machine according to any one of claims 10 to 15, wherein: When the working machine is placed on a placement surface in a state in which the blade cover is attached to the blade unit, the release portion comes into contact with the placement surface.

17. The working machine according to any one of claims 10 to 16, wherein: The blade unit includes the housing. The abutment portion is separated from the housing when the blade cover is attached to the blade unit, and abuts against the blade portion in the second direction.

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