Work machine

Abstract

The present application provides a work machine. The work machine suppresses a cut object from moving to a power conversion mechanism. The work machine includes: a prime mover; a power conversion mechanism that converts power of the prime mover; a first blade that is connected to the power conversion mechanism; a second blade that overlaps the first blade in a vertical direction and opposes a first opposite surface of the first blade; a seal member that is engaged with a first non-opposite surface of the first blade on a side opposite the first opposite surface, has a first seal surface that opposes the first non-opposite surface of the first blade in the vertical direction; and a cover member that opposes a second seal surface of the seal member on a side opposite the first seal surface. The first blade reciprocates in a first direction relative to the second blade. The seal member is disposed on a front side of the power conversion mechanism in a front-rear direction orthogonal to the vertical direction, and suppresses a cut object cut by the first blade and the second blade from moving between the first blade and the cover member toward the power conversion mechanism.

Description

Technical Field

[0001] This invention relates to a work machine. Background Technology

[0002] Patent Document 1 discloses a blade unit. The blade unit includes: a first blade; a second blade that overlaps with the first blade in the vertical direction and faces a first opposing surface of the first blade; a scraper that is engaged with the first opposing surface of the first blade; and a guide member that overlaps with the second blade in the vertical direction on the opposite side of the first blade relative to the second blade. The guide member has a soil discharge hole extending through in the vertical direction. When the first blade reciprocates relative to the second blade in a first direction, the scraper also reciprocates relative to the second blade in the first direction. When the scraper reciprocates relative to the second blade in the first direction, foreign matter (e.g., soil) located between the first blade and the guide member is pushed out by the scraper in the direction along the first direction and discharged from between the first blade and the guide member through the soil discharge hole.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 7-274649 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] When the blade unit described above is used in machinery equipped with a power conversion mechanism (e.g., a lawnmower), the blade unit is connected, for example, to the front of the power conversion mechanism. When grass, lawn, or other materials are cut by the first and second blades, most of the cut material is pushed out by the blades in the direction along the first direction, accompanied by the reciprocating motion of the scraper. However, a portion of the cut material may move past the scraper and into the power conversion mechanism. This specification discloses a technique capable of preventing the cut material from moving into the power conversion mechanism.

[0008] Solution for solving the problem

[0009] The working machine disclosed in this specification includes: a prime mover; a power conversion mechanism for converting the power of the prime mover; a first blade connected to the power conversion mechanism; a second blade overlapping the first blade in the vertical direction and facing the first opposing surface of the first blade; a sealing member engaged with a first non-opposing surface of the first blade opposite to the first opposing surface, having a first sealing surface facing the first non-opposing surface of the first blade in the vertical direction; and a cover member facing the second sealing surface of the sealing member opposite to the first sealing surface. The first blade has a first cutting edge. The second blade has a second cutting edge. Using the power of the prime mover, the first blade reciprocates relative to the second blade in a first direction. When the working machine moves forward in a forward-backward direction orthogonal to the vertical direction while the first blade is reciprocating relative to the second blade, the first cutting edge of the first blade and the second cutting edge of the second blade are cut off by the object to be cut. The sealing member is disposed in the front side of the power conversion mechanism in the front-back direction to prevent the cut object cut by the first cutting edge of the first blade and the second cutting edge of the second blade from moving toward the power conversion mechanism between the first blade and the cover member.

[0010] With the above structure, the sealing member inhibits the movement of the object being cut toward the power conversion mechanism. Furthermore, since the sealing member is engaged with the first blade, it reciprocates along the first direction relative to the second blade, together with the first blade. This pushes the object being cut out in the direction along the first direction. By making the structure like this, it is possible to inhibit the movement of the object being cut toward the power conversion mechanism. Attached Figure Description

[0011] Figure 1 This is a perspective view of the operating machinery 2 in the embodiment.

[0012] Figure 2 This is a perspective view of the vicinity of the rear end unit 6 of the operating machinery 2 in the embodiment.

[0013] Figure 3 This is a perspective view of the electric motor 32 and the reduction mechanism 34 of the working machine 2 in the embodiment.

[0014] Figure 4 This is a perspective view of the vicinity of the front end unit 8 of the operating machine 2 in the embodiment.

[0015] Figure 5 This is a cross-sectional view near the front end unit 8 of the working machine 2 in the embodiment.

[0016] Figure 6 This is an exploded perspective view of the blade unit 46 of the working machine 2 in the embodiment.

[0017] Figure 7 This is a front sectional view near the blade unit 46 of the working machine 2 in the embodiment.

[0018] Figure 8 This is a perspective view of the cover component 52 of the working machine 2 in the embodiment.

[0019] Figure 9 This is a top cross-sectional view near the blade unit 46 of the working machine 2 in the embodiment.

[0020] Figure 10 This is a vertical cross-sectional view near the blade unit 46 of the working machine 2 in the embodiment.

[0021] Explanation of reference numerals in the attached figures

[0022] 2. Operating machinery; 4. Control lever; 6. Rear end unit; 8. Front end unit; 10. Wheel; 32. Electric motor; 36. Transmission shaft; 40. Front end housing; 44. Power conversion mechanism; 46. Blade unit; 52. Cover component; 56. Gear storage chamber; 70. First blade; 72. Second blade; 76. First guide component; 78. Second guide component; 80. Sealing component; 82. First blade body; 84. First cutting edge; 96. Second blade body; 98. Second cutting edge; 112. Second guide component body; 114. Cover component; 118. Sealing component body; 140. Crank chamber; 148. Right inclined wall; 150. Left inclined wall; 156. Right grease guard; 158. Left grease guard; 166. Central protruding wall; 170. Right outlet; 172. Left outlet; BP, battery pack Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings, providing representative and non-limiting examples. This detailed description is intended merely to show those skilled in the art the details of preferred embodiments for carrying out the invention, and is not intended to limit the scope of the invention. Furthermore, in order to provide further improved working machinery, methods of manufacturing thereof, and methods of use, the additional features and technical solutions disclosed below may be used independently of other features and technical solutions, or in combination with other features and technical solutions.

[0024] Furthermore, the features and combinations of processes disclosed in the following detailed description are not, in the broadest sense, necessary for carrying out the invention, but are described only to illustrate representative specific examples of the invention. Moreover, in providing additional and useful embodiments of the invention, the various features of the above and following representative examples, as well as the various features recited in the independent and dependent claims, are not necessarily required to be combined in the same order as the examples described herein or in the listed order.

[0025] All features set forth in this specification and / or claims are intended to be disclosed separately and independently of the specific matters disclosed and claimed in the original application, with respect to the structure of the features set forth in the embodiments and / or claims. Furthermore, all numerical ranges and descriptions relating to organizations or groups are intended to limit the specific matters disclosed and claimed in the original application, with the intention of disclosing these intermediate structures.

[0026] In one or more embodiments, the sealing member may reciprocate together with the first blade along a first direction. Alternatively, the cover member may have a discharge port. Alternatively, the inlet of the discharge port may be positioned opposite the sealing member in the first direction.

[0027] With the above structure, the object to be cut is pushed towards the inlet of the discharge port by the reciprocating motion of the sealing member. This allows the object to be easily discharged from the machine.

[0028] In one or more embodiments, the outlet of the discharge port may be positioned opposite the inlet of the discharge port in the first direction.

[0029] With the above structure, the object to be cut moves along the first direction to the outlet as it enters from the inlet of the outlet. This makes it easier to remove the object from the machine.

[0030] In one or more embodiments, the cover member may have a grease guard that is positioned rearward of the outlet in the front-rear direction to inhibit the movement of grease.

[0031] Lubricating grease is applied to the power conversion mechanism to reduce friction during operation. Sometimes, the applied grease may scatter from the power conversion mechanism during operation. With the above structure, the grease that scatters from the power conversion mechanism is prevented from moving to the discharge port due to the grease guard. This prevents grease from escaping from the discharge port to the outside of the machine.

[0032] In one or more embodiments, the cover member may have a protruding wall extending toward the first non-opposing surface of the first blade and positioned forward of the sealing member. Alternatively, the protruding wall may at least partially overlap the sealing member when the machine is viewed in a front-rear direction.

[0033] With the above structure, the protruding wall closes at least a portion of the gap between the second sealing surface of the sealing member and the cover member in the front-rear direction. This further inhibits the movement of the cut-off object past the sealing member toward the power conversion mechanism.

[0034] (Example)

[0035] like Figure 1 As shown, the gardening machine 2 in this embodiment is an electric gardening machine, such as a ground trimmer, used to cut grass, lawn, etc. growing on the ground. The gardening machine 2 includes: an operating lever 4 extending in a straight line; a rear end unit 6 mounted at one end of the operating lever 4 along its length; a front end unit 8 mounted at the other end of the operating lever 4 along its length; a pair of wheels 10 mounted near the other end of the operating lever 4 along its length; a ring handle 12 mounted near the center of the operating lever 4 along its length; and a battery pack BP. The gardening machine 2 operates using electricity supplied from the battery pack BP. With one hand holding the rear end unit 6 and the other hand holding the ring handle 12, the user pushes the gardening machine 2 forward, causing the pair of wheels 10 to rotate, thereby cutting grass, lawn, etc. growing on the ground while moving the gardening machine 2 on the ground. In the following text, the direction in which the working machine 2 moves by rotating a pair of wheels 10 is called the forward and backward direction, the direction orthogonal to the ground is called the up and down direction, and the direction orthogonal to both the forward and backward and up and down directions is called the left and right direction. In addition, the direction in which the working machine 2 moves to cut grass, lawns, etc. growing on the ground (in this embodiment, the direction of pushing the working machine 2 out) is called the forward direction, and the direction opposite to the forward direction is called the rearward direction.

[0036] like Figure 2 As shown, the rear unit 6 includes a rear housing 16. The rear housing 16 includes a support portion 18, a grip portion 20, and a battery mounting portion 22.

[0037] The operating lever 4 is inserted into the support portion 18. A main power switch 24 is disposed on the upper surface of the support portion 18. The main power switch 24 is used to switch the on and off states of the working machine 2.

[0038] The grip 20 is located on the rear side of the support 18. The trigger 26 is rotatably mounted on the lower front side of the grip 20. The trigger 26 can be pushed in by the fingers of a user holding the grip 20. If the trigger 26 is pushed in while the machine 2 is in the energized state, the electric motor 32 (described later) will activate. Figure 3 To perform an action.

[0039] Furthermore, the fin 28 is rotatably mounted on the upper front side of the grip 20. The fin 28 can be pushed in by the palm of a user holding the grip 20. With the fin 28 pushed in, the user can push the trigger 26 in. On the other hand, with the fin 28 not pushed in, the user cannot push the trigger 26 in.

[0040] The battery mounting section 22 is located at the rear of the grip section 20. The battery pack BP is detachably mounted to the rear end of the battery mounting section 22. The battery pack BP can be mounted to the battery mounting section 22 by sliding it along the rear end of the battery mounting section 22 from top to bottom relative to the battery mounting section 22. Furthermore, the battery pack BP can be detached from the battery mounting section 22 by sliding it along the rear end of the battery mounting section 22 from bottom to top relative to the battery mounting section 22 from the state where the battery pack BP is mounted to the battery mounting section 22. Therefore, the battery pack BP can be detached from the battery mounting section 22 for charging.

[0041] like Figure 3 As shown, an electric motor 32 and a reduction gear 34 are housed inside the battery mounting section 22. The electric motor 32 is an example of a prime mover. The electric motor 32 is, for example, a brushless motor. In a variation, the electric motor 32 may also be a brushed motor. The electric motor 32 utilizes power from the battery pack BP (see reference BP). Figure 2 The supplied electricity is used to operate.

[0042] The reduction mechanism 34 includes a first reduction gear 34a and a second reduction gear 34b. Both gears are spur gears. The first reduction gear 34a is connected to the motor shaft 32a of the electric motor 32. The second reduction gear 34b meshes with the first reduction gear 34a. The second reduction gear 34b has more teeth than the first reduction gear 34a. While the first reduction gear 34a rotates with the rotation of the motor shaft 32a of the electric motor 32, the second reduction gear 34b rotates at a lower speed than the first reduction gear 34a.

[0043] A transmission shaft 36 is connected to the second reduction gear 34b. The transmission shaft 36 extends from the rear unit 6 (see reference). Figure 1 ) Pass through operating lever 4 (refer to) Figure 1 The interior extends to the front-end unit 8 (refer to...) Figure 1 The transmission shaft 36 rotates along with the rotation of the second reduction gear 34b.

[0044] like Figure 4 As shown, the front-end unit 8 is mounted on the operating lever 4 at a position forward of the pair of wheels 10. The front-end unit 8 includes a front-end housing 40 and a reduction mechanism 42 (see reference). Figure 5 ), power conversion mechanism 44 (refer to) Figure 5 ) and blade unit 46.

[0045] like Figure 5As shown, the front housing 40 includes a gear housing 50 and a cover member 52. The gear housing 50 is connected to the front end of the operating lever 4 using screws (not shown). The cover member 52 closes the lower opening of the gear housing 50. This forms a gear storage chamber 56 between the gear housing 50 and the cover member 52.

[0046] A reduction mechanism 42 is disposed in a gear housing 56. The reduction mechanism 42 includes a third reduction gear 42a and a fourth reduction gear 42b. Both the third and fourth reduction gears 42a and 42b are bevel gears. The third reduction gear 42a is connected to the front end of the transmission shaft 36. The fourth reduction gear 42b meshes with the third reduction gear 42a. The fourth reduction gear 42b has more teeth than the third reduction gear 42a. While the third reduction gear 42a rotates with the transmission shaft 36, the fourth reduction gear 42b rotates at a lower speed than the third reduction gear 42a. Furthermore, the fourth reduction gear 42b rotates about a rotation axis along the vertical direction.

[0047] The power conversion mechanism 44 is a cam-crank type conversion mechanism. The power conversion mechanism 44 includes a crankshaft 60, an upper plate 62, and a lower plate 64. The crankshaft 60 is rotatably supported on the gear housing 50 and the cover member 52 by means of bearings 66 and 68. The crankshaft 60 is connected to the fourth reduction gear 42b. Furthermore, the crankshaft 60 passes through the cover member 52, and its lower end is disposed outside the gear housing 56.

[0048] The upper plate 62 and the lower plate 64 are connected to the lower end of the crankshaft 60. The upper plate 62 and the lower plate 64 are circular plate-shaped. The upper plate 62 and the lower plate 64 rotate by the rotation of the crankshaft 60. The center of rotation of the upper plate 62 is offset from the center of its circular plate shape, and the center of rotation of the lower plate 64 is offset from the center of its circular plate shape. When the upper plate 62 rotates from rear to front, the lower plate 64 rotates from front to rear, and vice versa. Furthermore, grease is applied to the upper plate 62 and the lower plate 64 to reduce friction between them.

[0049] Reference Figure 6 The blade unit 46 is described below. The blade unit 46 of this embodiment is capable of cutting grass, lawns, and the like that growing on the ground. The blade unit 46 includes a first blade 70, a second blade 72, an intermediate plate 74, a first guide member 76, a second guide member 78, and a sealing member 80.

[0050] The first blade 70 includes a first blade body 82, a first crank plate 86, and a plurality of first cutting edges 84. The first blade body 82 extends in a left-right direction. The first blade body 82 has a plurality of first elongated holes 88 extending along its length in the left-right direction. The first elongated holes 88 penetrate the first blade body 82 in the thickness direction (vertical direction). The plurality of first cutting edges 84 protrude forward from the front surface 82a of the first blade body 82 extending in the left-right direction. The plurality of first cutting edges 84 are arranged in the left-right direction. The first crank plate 86 is disposed near the center of the first blade body 82 in the left-right direction and is located at the rear side of the first blade body 82. The first crank plate 86 has a plurality of (two in this embodiment) locking holes 90 and a first crank opening 92 disposed at a position further rear of the plurality of locking holes 90. The two locking holes 90 penetrate the first crank plate 86 in the vertical direction. The two locking holes 90 are arranged in the left-right direction. The first crank opening 92 extends vertically through the first crank plate 86.

[0051] like Figure 6 As shown, the second blade 72 overlaps the lower side of the first blade 70 in the vertical direction. The second blade 72 has a shape consistent with that of the first blade 70. The second blade 72 includes a second blade body 96, a second crank plate 100, and a plurality of second cutting edges 98. The second blade body 96 extends in the left-right direction. When the second blade body 96 overlaps with the first blade body 82, the front surface 96a of the second blade body 96 is aligned vertically with the front surface 82a of the first blade body 82, the rear surface 96b of the second blade body 96 is aligned vertically with the rear surface 82b of the first blade body 82, and the upper surface 96c of the second blade body 96 is opposite to the lower surface 82c of the first blade body 82. The second blade body 96 has a plurality of second elongated holes 102 extending in the length direction in the left-right direction. The second elongated holes 102 penetrate the second blade body 96 in the thickness direction (vertical direction). Multiple second cutting edges 98 protrude forward from the front surface 96a of the second blade body 96, which extends in the left-right direction. The multiple second cutting edges 98 are arranged in the left-right direction. A second crank plate 100 is disposed near the center of the second blade body 96 in the left-right direction and is located at the rear side of the second blade body 96. The second crank plate 100 has a second crank opening 104 that extends through the second crank plate 100 in the up-down direction.

[0052] like Figure 6As shown, the intermediate plate 74 overlaps the upper side of the first blade 70 in the vertical direction. The intermediate plate 74 is positioned on the opposite side of the second blade 72 relative to the first blade 70. The intermediate plate 74 extends in the horizontal direction. Protrusions 108 extending forward are formed at both ends of the intermediate plate 74. The intermediate plate 74 closes a plurality of first elongated holes 88 of the first blade body 82 from the upper side in the vertical direction. The intermediate plate 74 has a plurality of intermediate threaded holes 74a penetrating the intermediate plate 74 in the thickness direction (vertical direction). The plurality of intermediate threaded holes 74a are arranged in the horizontal direction.

[0053] The first guide member 76 overlaps the upper side of the intermediate plate 74 in the vertical direction. The first guide member 76 is positioned on the side opposite to the first blade 70 relative to the intermediate plate 74. The first guide member 76 extends in the horizontal direction. The first guide member 76 has a plurality of first threaded holes 76a passing through it in the thickness direction (vertical direction). The plurality of first threaded holes 76a are arranged in the horizontal direction.

[0054] The second guide member 78 overlaps the lower side of the second blade 72 in the vertical direction. The second guide member 78 is positioned on the side opposite to the first blade 70 relative to the second blade 72. The second guide member 78 includes a second guide member body 112 and a cover member 114. The second guide member body 112 extends in the left-right direction. The second guide member body 112 closes a plurality of second elongated holes 102 of the second blade body 96 from the lower side in the vertical direction. The second guide member body 112 has a plurality of second front threaded holes 112a penetrating the second guide member body 112 in the thickness direction (vertical direction). The plurality of second front threaded holes 112a are arranged in the left-right direction. The cover member 114 is positioned near the center of the second guide member body 112 in the left-right direction and is located on the rear side of the second guide member body 112. The cover member 114 includes a plurality of second rear threaded holes 114a extending through the cover member 114 in the thickness direction (vertical direction) and a recess 114b recessed from the upper surface of the cover member 114 toward the lower side.

[0055] The sealing member 80 is engaged with the upper surface of the first crank plate 86 near the connection between the first blade body 82 and the first crank plate 86 in the vertical direction. The sealing member 80 is positioned closer to the first blade body 82 than the stepped area formed on the first crank plate 86. The upper surface of the first crank plate 86 constitutes a part of the upper surface of the first blade 70. Furthermore, the sealing member 80 is positioned rearward than the first cutting edge 84 and the second cutting edge 98. Figure 7As shown, the sealing member 80 includes a sealing member body 118, a right wall 120, a left wall 122, and a plurality of (two in this embodiment) locking protrusions 124. The sealing member body 118 extends in the left-right direction. The lower surface 118a of the sealing member body 118 is opposite to the upper surface of the first crank plate 86. The lower surface 118a of the sealing member body 118 constitutes the lower surface of the sealing member 80. The width of the sealing member body 118 in the left-right direction is longer than the width of the first crank plate 86 in the left-right direction. The right wall 120 extends downward from the right end of the sealing member body 118. The left wall 122 extends downward from the left end of the sealing member body 118. The first crank plate 86 is sandwiched between the right wall 120 and the left wall 122. This inhibits the left-right movement of the sealing member 80 relative to the first blade 70. The two locking protrusions 124 extend downward from the lower surface 118a of the sealing member body 118. Two locking protrusions 124 are positioned between the right wall 120 and the left wall 122 in the left-right direction. Each locking protrusion 124 is inserted into a locking hole 90 in the first crank plate 86. This inhibits the sealing member 80 from moving relative to the first blade 70 in the front-back and left-right directions.

[0056] like Figure 6 As shown, the first blade 70, the second blade 72, the intermediate plate 74, the first guide member 76, and the second guide member 78 are secured using screws 128 and nuts 130. At this time, screws 128 are inserted into the second front threaded hole 112a of the second guide member 78, the first elongated hole 88 of the first blade 70, the second elongated hole 102 of the second blade 72, the intermediate threaded hole 74a of the intermediate plate 74, and the first threaded hole 76a of the first guide member 76. Nuts 130 receive screws 128 on the upper side of the first guide member 76. Washers 132 are inserted between the screw head of the leftmost and rightmost screws 128 and the second guide member 78. Furthermore, annular sleeves 134 are arranged in the first elongated hole 88 of the first blade 70 and the second elongated hole 102 of the second blade 72. Screws 128 are inserted into sleeves 134. Sleeve 134 guides the reciprocating motion of the first blade 70 and the second blade 72 in the left and right directions.

[0057] In addition, such as Figure 5 As shown, with the first blade 70, the second blade 72, the intermediate plate 74, the first guide member 76, and the second guide member 78 assembled together, the second guide member 78 is inserted into the second rear threaded hole 114a by a screw 136 (see reference). Figure 6It is fixed to the lower side of the cover member 52. Thus, a crank chamber 140 is formed between the cover member 52 and the recess 114b of the second guide member 78. The upper plate 62 and lower plate 64 of the power conversion mechanism 44, the first crank plate 86 of the first blade 70 and the second crank plate 100 of the second blade 72 are arranged in the crank chamber 140.

[0058] When the first blade 70, the second blade 72, the intermediate plate 74, the first guide member 76, and the second guide member 78 are assembled together, and the second guide member 78 is fixed to the lower side of the cover member 52, the upper plate 62 is disposed at the first crank opening 92 of the first crank plate 86, and the lower plate 64 is disposed at the second crank opening 104 of the second crank plate 100. The first blade 70 reciprocates in the left-right direction relative to the front end housing 40 by rotating the upper plate 62 while it abuts against the inner surface of the first crank opening 92. Similarly, the second blade 72 reciprocates in the left-right direction relative to the front end housing 40 by rotating the lower plate 64 while it abuts against the inner surface of the second crank opening 104. Furthermore, when the second blade 72 moves to the left, the first blade 70 moves to the right, and when the second blade 72 moves to the right, the first blade 70 moves to the left.

[0059] Next, refer to Figure 8 The detailed construction of the cover member 52 defining the crankcase 140 is described below. The cover member 52 includes an upper wall 144, a U-shaped wall 146, a right-sloping wall 148, a left-sloping wall 150, and a front wall 152. The upper wall 144 connects to the gear housing 50 (see reference). Figure 5 ) demarcate gear storage compartments 56 (refer to) Figure 5 The upper wall 144 has a crankshaft 60 (see reference). Figure 5 The upper opening 144a is inserted.

[0060] The letter-U shaped wall 146, the right-sloping wall 148, the left-sloping wall 150, and the front wall 152 are disposed below the upper wall 144. The letter-U shaped wall 146 has a generally letter-U shape when the cover member 52 is viewed from below. The letter-U shaped wall 146 opens towards the front.

[0061] The right-sloping wall 148 extends forward and to the right from the right front end of the letter-U-shaped wall 146, then bends and extends to the right. A right grease guard 156 is formed near the connection between the right-sloping wall 148 and the right front end of the letter-U-shaped wall 146. The right grease guard 156 protrudes to the left relative to the inner surface of the right front end of the letter-U-shaped wall 146.

[0062] The left-sloping wall 150 extends forward and to the left from the left front end of the letter-U-shaped wall 146. A left grease guard 158 is formed near the connection between the left-sloping wall 150 and the left front end of the letter-U-shaped wall 146. The left grease guard 158 protrudes to the right relative to the inner surface of the left front end of the letter-U-shaped wall 146.

[0063] The front wall 152 extends laterally from the front end of the upper wall 144. The front wall 152 includes a right protruding wall 162, a left protruding wall 164, and a central protruding wall 166. The right protruding wall 162 is positioned in front of the right inclined wall 148. The right protruding wall 162 is offset forward relative to the right inclined wall 148. This forms a right outlet 170 between the right protruding wall 162 and the right inclined wall 148. The right outlet 170 communicates with the crank chamber 140 and the external space of the machine tool 2. The inlet 170a of the right outlet 170 is opposite the outlet 170b of the right outlet 170 in the left-right direction. Figure 9 As shown, the width of the right outlet 170 in the front-to-back direction is shorter than the width of the sealing member 80 in the front-to-back direction.

[0064] like Figure 8 As shown, the left protruding wall 164 is positioned in front of the left inclined wall 150. The left protruding wall 164 is offset forward relative to the left inclined wall 150. This forms a left exhaust outlet 172 between the left protruding wall 164 and the left inclined wall 150. The left exhaust outlet 172 connects the crank chamber 140 and the external space of the working machine 2. The inlet 172a of the left exhaust outlet 172 is opposite to the outlet 172b of the left exhaust outlet 172 in the left-right direction. Figure 9 As shown, the width of the left outlet 172 in the front-to-back direction is shorter than the width of the sealing member 80 in the front-to-back direction.

[0065] like Figure 8 As shown, a central protruding wall 166 is positioned between a right protruding wall 162 and a left protruding wall 164. The vertical length of the central protruding wall 166 is shorter than both the vertical lengths of the right protruding wall 162 and the left protruding wall 164. Consequently, a front opening 174 is formed between the right protruding wall 162 and the left protruding wall 164, at a position below the central protruding wall 166.

[0066] The positional relationship between the cover component 52 and the blade unit 46 will be explained next. For example... Figure 9 As shown, with the blade unit 46 mounted on the cover member 52, the first crank plate 86 of the first blade 70 and the second crank plate 100 of the second blade 72 (see reference) Figure 6The sealing member 80 is inserted into the front opening 174 of the cover member 52. The sealing member 80 is positioned rearward from the front opening 174. Furthermore, the sealing member 80 is positioned between the upper plate 62 and the lower plate 64 within the crankcase 140 (see reference). Figure 5 (i.e., the position forward of the power conversion mechanism 44). Furthermore, the sealing member 80 is positioned in the left-right direction opposite to the inlet 170a of the right outlet 170 and the inlet 172a of the left outlet 172. For example... Figure 10 As shown, the sealing member 80 is disposed behind the central protruding wall 166. When the blade unit 46 is viewed in the front-rear direction, the sealing member 80 and the central protruding wall 166 at least partially overlap. A labyrinth structure is formed by the sealing member 80 and the central protruding wall 166. Furthermore, the upper surface 118b of the sealing member body 118 faces the upper wall 144 of the cover member 52. In addition, the upper surface 118b of the sealing member body 118 constitutes the upper surface of the sealing member 80. The upper surface 118b of the sealing member body 118 is separate from the upper wall 144. The central protruding wall 166 extends toward the upper surface of the first crank plate 86. The central protruding wall 166 is disposed between the sealing member 80 and the intermediate plate 74 in the front-rear direction. When the blade unit 46 is viewed in the front-rear direction, the central protruding wall 166 and the intermediate plate 74 at least partially overlap.

[0067] Next, we will describe the action of cutting grass, lawn, and other materials using the first blade 70 and the second blade 72. As mentioned above, when the electric motor 32 operates, the power of the electric motor 32 is transmitted via the transmission shaft 36 (see reference). Figure 3 ) and power conversion mechanism 44 (refer to Figure 5 The material is transferred to the first blade 70 and the second blade 72, which reciprocate in the left-right direction relative to the front housing 40. When the working machine 2 is pushed forward, the object to be cut is clamped between the first cutting edge 84 of the first blade 70 and the second cutting edge 98 of the second blade 72 and is cut off.

[0068] The object being cut sometimes moves rearward between the first blade 70 and the intermediate plate 74 as the first blade 70 reciprocates in the left-right direction. After passing the intermediate plate 74, the object moves toward the central protruding wall 166 of the cover member 52. Due to the labyrinth structure formed by the sealing member 80 and the central protruding wall 166, the object cannot move in the gap between the upper surface 118b of the sealing member body 118 and the cover member 52. This inhibits the object from moving toward the power conversion mechanism 44.

[0069] Furthermore, since the first blade 70 reciprocates in the left-right direction, therefore... Figure 9As shown, the sealing member 80 inhibits the rearward movement of the cut-off material, which is pushed to the right by the right wall 120 of the sealing member 80. The pushed-off cut-off material enters the interior of the right discharge outlet 170 from the inlet 170a. After moving to the right inside the right discharge outlet 170, the cut-off material is discharged to the outside of the crank chamber 140 from the outlet 170b of the right discharge outlet 170.

[0070] Furthermore, the sealing member 80 inhibits the rearward movement of the cut-off material, and sometimes the left wall 122 of the sealing member 80 is pushed to the left. The pushed-off cut-off material enters the interior of the left exhaust outlet 172 from the inlet 172a. After moving to the left inside the left exhaust outlet 172, the cut-off material is discharged to the outside of the crankcase 140 from the outlet 172b of the left exhaust outlet 172.

[0071] Furthermore, when the cut material is discharged to the outside of the crank chamber 140, the upper plate 62 and lower plate 64 of the power conversion mechanism 44 (see reference) Figure 5 During operation, some grease adhering to the upper platen 62 and lower platen 64 may scatter from them. This scattered grease moves forward along the U-shaped wall 146 within the crank chamber 140. Grease reaching the front end of the U-shaped wall 146 is intercepted by the right grease guard 156 and the left grease guard 158, preventing it from moving further forward than these guards. Consequently, the grease is not easily discharged to the outside of the crank chamber 140 via the right outlet 170 and the left outlet 172.

[0072] (Effect)

[0073] The working machine 2 includes an electric motor 32, a power conversion mechanism 44 for converting the power of the electric motor 32, a first blade 70 connected to the power conversion mechanism 44, a second blade 72 that overlaps with the first blade 70 in the vertical direction and is opposite to the lower surface of the first blade 70, a sealing member 80 that is locked to the upper surface of the first blade 70 opposite to the lower surface and has a lower surface that is opposite to the upper surface of the first blade 70 in the vertical direction, and a cover member 52 that is opposite to the upper surface of the sealing member 80. The first blade 70 has a first cutting edge 84. The second blade 72 has a second cutting edge 98. Using the power of the electric motor 32, the first blade 70 reciprocates relative to the second blade 72 in the left-right direction. When the working machine 2 moves forward in a forward-backward direction orthogonal to the vertical direction while the first blade 70 is reciprocating relative to the second blade 72, the first cutting edge 84 of the first blade 70 and the second cutting edge 98 of the second blade 72 are cut off. The sealing member 80 is disposed in the front side of the power conversion mechanism 44 in the front-back direction, and inhibits the movement of the cut object cut by the first cutting edge 84 of the first blade 70 and the second cutting edge 98 of the second blade 72 toward the power conversion mechanism 44 between the first blade 70 and the cover member 52.

[0074] With the above structure, the sealing member 80 inhibits the movement of the object being cut toward the power conversion mechanism 44. Furthermore, since the sealing member 80 is engaged with the first blade 70, the sealing member 80 and the first blade 70 reciprocate together relative to the second blade 72 in the left-right direction. Thus, the sealing member 80 pushes the object being cut out in the left-right direction. By making it such a structure, the movement of the object being cut toward the power conversion mechanism 44 can be inhibited.

[0075] Furthermore, the sealing member 80 reciprocates together with the first blade 70 in the left-right direction. The cover member 52 includes outlets 170 and 172. The inlets 170a and 172a of the outlets 170 and 172 are positioned opposite the sealing member 80 in the left-right direction.

[0076] With the above structure, the reciprocating motion of the sealing member 80 pushes the cut-off material toward the inlets 170a and 172a of the discharge outlets 170 and 172. Thus, the cut-off material can be easily discharged from the working machine 2.

[0077] In addition, the outlets 170b and 172b of the outlets 170 and 172 are positioned in the left-right direction opposite to the inlets 170a and 172a of the outlets 170 and 172.

[0078] With the above structure, the object to be cut moves in the left and right direction to the outlets 170b and 172b of the outlets 170 and 172 as it enters from the inlets 170a and 172a of the outlets 170 and 172. This makes it easier to discharge the object to be cut from the machine 2.

[0079] The cover component 52 also includes grease guards 156 and 158, which are arranged in the front-rear direction at a position further rear than the outlets 170 and 172 to inhibit the movement of grease.

[0080] With the above structure, grease is applied to the power conversion mechanism 44 to reduce friction during operation. When the power conversion mechanism 44 is in operation, the applied grease may sometimes scatter from it. With the above structure, the grease scattering from the power conversion mechanism 44 is less likely to move to the discharge ports 170 and 172 due to the grease guards 156 and 158. This prevents grease from being discharged from the discharge ports 170 and 172 to the outside of the machine tool 2.

[0081] The cover member 52 also includes a central protruding wall 166 that extends toward the upper surface of the first blade 70 and is positioned forward of the sealing member 80. When the machine 2 is viewed in the front-rear direction, the central protruding wall 166 at least partially overlaps with the sealing member 80.

[0082] With the above structure, the central protruding wall 166 closes at least a portion of the gap between the upper surface of the sealing member 80 and the cover member 52 in the front-rear direction. This further inhibits the movement of the cut-off object across the sealing member 80 toward the power conversion mechanism 44.

[0083] (Correspondence)

[0084] The lower surface of the first blade 70 is an example of a "first opposing surface". The upper surface of the first blade 70 is an example of a "first non-opposing surface". The lower surface of the sealing member 80 is an example of a "first sealing surface". The upper surface of the sealing member 80 is an example of a "second sealing surface". The left-right direction is an example of a "first direction". The central protruding wall 166 is an example of a "protruding wall".

[0085] (Modified Example)

[0086] In one implementation, the working machine 2 can also be a lawnmower.

[0087] In one embodiment, the working machine 2 may also be without a battery pack BP, and instead use power supplied from an external power source via an external power line to operate.

[0088] In one embodiment, the working machine 2 may also be without a pair of wheels 10.

[0089] In one embodiment, the working machine 2 may also have an engine to replace the electric motor 32.

[0090] In one embodiment, the blade unit 46 may also include a sealing member that engages with the lower surface of the second blade 72. In this case, the sealing member is disposed between the second blade 72 and the second guide member 78. With this structure, movement of the object to be cut from between the second blade 72 and the second guide member 78 toward the power conversion mechanism 44 can be prevented.

[0091] In one embodiment, the width of the right outlet 170 in the front-rear direction may also be longer than the width of the sealing member 80 in the front-rear direction. Furthermore, the width of the left outlet 172 in the front-rear direction may also be longer than the width of the sealing member 80 in the front-rear direction.

[0092] In one embodiment, the first blade 70 may also have a cutting edge disposed on the rear surface 82b of the first blade body 82. Furthermore, the second blade 72 may also have a cutting edge disposed on the rear surface 96b of the second blade body 96.

[0093] In one embodiment, the first blade 70 and the second blade 72 can reciprocate in a straight line (in this embodiment, along the left-right direction) or in an arc. When the first blade 70 and the second blade 72 reciprocate in an arc, they reciprocate by rotating around a rotation axis along the up-down direction as a center. That is, the first direction is the circumferential direction along the rotation axis.

[0094] In the above embodiment, by pushing out the working machine 2, the object to be cut is cut by the first cutting edge 84 of the first blade 70 and the second cutting edge 98 of the second blade 72. In another embodiment, the object to be cut is also cut by the first cutting edge 84 of the first blade 70 and the second cutting edge 98 of the second blade 72 when the user pulls the working machine 2 toward the user. In this case, the direction of pulling the working machine 2 is forward. Furthermore, the first cutting edge 84 (second cutting edge 98), the central protruding wall 166, the sealing member 80, and the power conversion mechanism 44 are arranged sequentially from the front to the rear (i.e., toward the direction of separation from the user). Furthermore, when the user uses the working machine 2, the first cutting edge 84 and the second cutting edge 98 face the user. With the above structure, the movement of the object to be cut by the first cutting edge 84 and the second cutting edge 98 toward the power conversion mechanism can be prevented by the central protruding wall 166 and the sealing member 80.

Claims

1. A type of operating machinery, wherein, The operating machinery includes: prime mover; A power conversion mechanism for converting the power of the prime mover; The first blade is connected to the power conversion mechanism; The second blade overlaps the first blade in the vertical direction and faces the first opposing surface of the first blade; A sealing member, which is engaged with a first non-opposing surface of the first blade opposite to the first opposing surface, has a first sealing surface opposite the first non-opposing surface of the first blade in the vertical direction; and The cover member is opposite to the second sealing surface of the sealing member, which is opposite to the first sealing surface. The first blade has a first cutting edge. The second blade has a second cutting edge. Using the power of the prime mover, the first blade reciprocates relative to the second blade along the first direction. When the working machine moves forward in a forward-backward direction orthogonal to the vertical direction while the first blade is reciprocating relative to the second blade, the first cutting edge of the first blade and the second cutting edge of the second blade will cut the object being cut. The sealing member is disposed on the front side of the power conversion mechanism in the front-rear direction, preventing the cut object, which is cut by the first cutting edge of the first blade and the second cutting edge of the second blade, from moving towards the power conversion mechanism between the first blade and the cover member. The sealing member reciprocates together with the first blade along the first direction. The cover component defines the crank chamber, and the upper and lower plates of the power conversion mechanism are disposed within the crank chamber. The cover component has a discharge port that connects the crank chamber to the external space of the machine. The inlet of the outlet is positioned opposite the sealing member in the first direction.

2. The operating machinery according to claim 1, wherein, The outlet of the discharge port is positioned opposite the inlet of the discharge port in the first direction.

3. The operating machinery according to claim 1, wherein, The cover component has a grease guard, which is positioned rearward than the outlet in the front-rear direction to inhibit the movement of grease.

4. The operating machinery according to claim 2, wherein, The cover component has a grease guard, which is positioned rearward than the outlet in the front-rear direction to inhibit the movement of grease.

5. The operating machinery according to any one of claims 1 to 4, wherein, The cover member has a protruding wall that extends toward the first non-opposing surface of the first blade and is positioned forward of the sealing member. When the machine is viewed along the front-back direction, the protruding wall and the sealing member at least partially overlap.

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