chain saw

Abstract

A chain saw is disclosed, and a technique capable of inhibiting chips from advancing to a deep portion of a chain passage and inhibiting the chips from being stored in the chain passage is provided. The chain saw includes a saw chain, a guide bar, a sprocket, a prime mover, a housing, a sprocket cover, and a guide member. The chain passage is formed by the guide bar, the housing, and the sprocket cover. The guide member has a first opposing surface having a circular arc shape centered on a rotation axis when viewed in a direction along the rotation axis, and a second opposing surface having a circular arc shape centered on a position offset with respect to the rotation axis. In a state in which the chain saw is placed on a horizontal placement surface, an angle formed by a straight line connecting a position at which the first opposing surface and the second opposing surface are connected and the rotation axis and the horizontal surface is in a range of -10° to 25° when viewed in the direction along the rotation axis.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a chainsaw. Background Technology

[0002] Patent Document 1 discloses a chainsaw. The chainsaw includes: a saw chain; a guide bar on which the saw chain is mounted; a sprocket that causes the saw chain to travel along the periphery of the guide bar; a prime mover that causes the sprocket to rotate about a rotation axis; a housing that houses the prime mover; a sprocket cover that covers the sprocket; and a guide member. The guide bar, the housing, and the sprocket cover form a chain passage for the saw chain to pass through. The guide member has an opposing surface disposed opposite to the saw chain within the chain passage and has an arcuate shape centered on the rotation axis when viewed from a direction along the rotation axis. According to this chainsaw, since the passage area of ​​the chain passage is narrowed by utilizing the guide member, it is possible to suppress the advance of chips entering the chain passage into the depth of the chain passage.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: U.S. Patent Application Publication No. 2013 / 0318802 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] If chips that are prevented from advancing into the depths of the chain path accumulate within the chain path, the rotation of the saw chain may be hindered by the accumulated chips. This specification provides a technique for preventing chips from advancing into the depths of the chain path and for preventing chip accumulation within the chain path in a chainsaw.

[0008] Solution for solving the problem

[0009] This specification discloses a chainsaw. The chainsaw may include: a saw chain; a guide bar on which the saw chain is mounted; a sprocket that causes the saw chain to travel along the periphery of the guide bar; a prime mover that causes the sprocket to rotate about a rotation axis; a housing that houses the prime mover; a sprocket cover that covers the sprocket; and a guide member. A chain path for the saw chain to pass through can be formed by the guide bar, the housing, and the sprocket cover. The guide member may have: a first opposing surface disposed opposite to the saw chain within the chain path, and having an arcuate shape centered on the rotation axis when viewed from a direction along the rotation axis; and a second opposing surface disposed opposite to the saw chain within the chain path, and having an arcuate shape centered at a position offset relative to the rotation axis when viewed from a direction along the rotation axis. Alternatively, when the chainsaw is placed on a horizontal mounting surface, the angle between the straight line connecting the positions of the first opposing surfaces and the second opposing surfaces and the axis of rotation, when viewed from the direction along the axis of rotation, and the horizontal plane, is in the range of -10° to 25°.

[0010] The effects of the invention

[0011] According to the above structure, at the point where the first and second opposing surfaces of the guide member connect, the passage area of ​​the chain path narrows, thus preventing chips from advancing into the depths of the chain path. Furthermore, according to the above structure, chips prevented from advancing into the depths of the chain path are discharged along the second opposing surface, which has an arc shape, thus preventing chip accumulation within the chain path. Moreover, according to the above structure, when the chainsaw is placed on a horizontal mounting surface, when viewed from the direction along the rotation axis, the angle between the line connecting the first and second opposing surfaces and the rotation axis and the horizontal plane is in the range of -10° to 25°, thus facilitating the downward discharge of chips prevented from advancing into the depths of the chain path under the influence of gravity. Attached Figure Description

[0012] Figure 1 This is a perspective view of the chainsaw 2 in the embodiment, viewed from the upper right rear.

[0013] Figure 2 This is a perspective view of the chainsaw 2 in the embodiment, viewed from the lower left front.

[0014] Figure 3 This is a side view of the chainsaw 2 in the embodiment, viewed from the right.

[0015] Figure 4 This is a perspective view of the state in which the battery pack B has been removed from the battery pack housing 24a in the chainsaw 2 of the embodiment, viewed from the upper left front.

[0016] Figure 5 This is a top view of the main body housing 24 of the chainsaw 2 in the embodiment, viewed from above.

[0017] Figure 6 This is a side view of the interior of the main body housing 24 of the chainsaw 2 in the embodiment, viewed from the left.

[0018] Figure 7 This is a cross-sectional view of the main housing 24 of the chainsaw 2 in the embodiment.

[0019] Figure 8 This is a perspective view of the base component 14, front handguard 18, motor 46, oil pump 50 and motor housing 66 of the chainsaw 2 in the embodiment, viewed from the lower left front.

[0020] Figure 9 This is a longitudinal sectional view near the cooling fan 62 of the chainsaw 2 in the embodiment.

[0021] Figure 10 This is a side view from the right, showing the state of the chainsaw 2 in the embodiment with the sprocket cover 22 removed.

[0022] Figure 11 This is a side view from the right, showing the state of the chainsaw 2 in the embodiment with the sprocket cover 22, guide rod 6 and brake cover 20 removed.

[0023] Figure 12 This is an exploded perspective view of the lower front part of the base component 14 of the chainsaw 2 in the embodiment.

[0024] Figure 13 This is a longitudinal sectional view of the portion near the bolt 78 of the chainsaw 2 in the embodiment.

[0025] Figure 14 This is a perspective view of the sprocket cover 22 of the chainsaw 2 in the embodiment, viewed from the upper left front.

[0026] Figure 15 This is a perspective view of the chain guides 110, 112 and the chip guide 118 of the chainsaw 2 in the embodiment, viewed from the upper right front.

[0027] Figure 16 This is a perspective view of the chainsaw 2 of the embodiment with the chain guides 110, 112 and the debris guide 118 removed from the sprocket cover 22, viewed from the upper right front.

[0028] Figure 17 This is a longitudinal sectional view near the sprocket 72 of the chainsaw 2 in the embodiment.

[0029] Figure 18 This is a perspective view of the area near the drain hole 24j of the chainsaw 2 in the embodiment, viewed from the upper right front.

[0030] Explanation of reference numerals in the attached figures

[0031] 2. Chainsaw; 4. Main body; 6. Guide rod; 6a. Elongated hole; 8. Saw chain; 10. Left side housing; 12. Right side housing; 14. Base component; 14a. Base plate; 14b. Support rib; 14c. Exhaust opening; 14d. Oil inlet; 16. Front handle; 16a. Right side fixing part; 16b. Upper grip part; 16c. Left side grip part; 16d. Lower fixing part; 18. Front hand guard; 18a. Hand guard part; 18b. Left side support part; 18c. Right side support part; 18d. Rotating shaft; 18e. Rotating shaft; 18f. Recess; 20. Brake cover; 22. Sprocket cover; 22a. Guide rib; 24. Main body housing; 24a. Battery pack housing; 24b. Battery pack mounting part; 24c. Recess ; 24d, Right handle mounting slot; 24e, Lower handle mounting slot; 24f, Air supply port; 24g, Exhaust port; 24h, Adjustment opening; 24i, Drain hole; 24j, Drain hole; 26, Rear handle; 28, Rear hand guard; 28a, First hand guard; 28b, Second hand guard; 30, Power button; 32, Power switch; 34, Control unit; 36, Trigger lever; 36a, Rotating shaft; 38, Trigger switch; 40, Locking lever; 40a, Rotating shaft; 42, Grip detection switch; 44, Torsion spring; 46, Motor; 48, Oil tank; 48a, Replenishment opening; 50, Oil pump; 52, Coil; 54, Stator; 56, Permanent magnet; 58, Rotor; 60, Output shaft; 62, Cooling fan; 62a, Plate; 62b, Blade; 64, Sensor base plate; 66, Motor housing; 66a, Air supply opening; 68, Bearing; 70, Bearing; 72, Sprocket; 74, Brake base; 76, Brake drum; 78, Bolt; 80, Bolt; 82, Nut; 84, Nut; 86, Engaging pin; 88, Engaging hole; 90, Rotary-to-linear conversion mechanism; 92, Adjusting screw; 94, Outer cover; 94a, Recess; 94b, Fastening opening; 94c, Fastening opening; 94d, Adjusting opening; 96, Sleeve; 96a, Bolt opening; 96b, Bolt opening; 96c, Adjusting screw opening; 98, Chain guide; 98a, Guide part; 98b, Engaging part; 99, Chain passage; 100, Chain guide Guide component; 100a, guide portion; 100b, engaging portion; 102, guide component mounting portion; 102a, mounting groove; 102b, engaged portion; 104, guide component mounting portion; 104a, mounting groove; 104b, engaged portion; 106, chain catcher; 108, pointed object; 110, chain guide component; 110a, guide portion; 110b, engaging portion; 112, chain guide component; 112a, guide portion; 112b, engaging portion; 114, guide component mounting portion; 114a, mounting groove; 114b, engaged portion; 116, guide component mounting portion; 116a, mounting groove; 116b, engaged portion; 118, debris guide component; 120, first guide portion; 120a, guide surface; 122, second guide portion;122a, Guide surface; 122b, Guide surface; 124, Third guide part; 124a, Guide surface; 124b, Guide surface; 126, Support part; 126a, Engaging hole; 126b, Engaging hole; 126c, Engaging hole; 128, Guide mounting part; 128a, Engaging pin; 128b, Engaging pin; 128c, Engaging pin; 129, Stop detection switch; 130, Locking member; 130a, Protrusion; 132, Compression spring; 134, Arm member; 136, Linkage member; 138, Braking member; 140, Brake band; 142, Compression spring; 144, Cover; 146, Inlet tube; 148, Outlet tube; 150, Worm gear; 152, Adjusting pin. Detailed Implementation

[0032] In the following description, representative and non-limiting examples of the invention are given in detail with reference to the accompanying drawings. This detailed description is merely intended to show those skilled in the art the details of preferred examples for carrying out the invention, and is not intended to limit the scope of the invention. Furthermore, in order to provide further improved chainsaws, methods of manufacturing the chainsaw, and methods of using the chainsaw, the additional features and technical solutions disclosed below can be used independently of or in conjunction with other features and technical solutions.

[0033] Furthermore, the features and combinations of processes disclosed in the following detailed description are not, in the broadest sense, essential 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 below representative examples, as well as the various features recited in the independent and dependent claims, do not necessarily need to be combined as in the specific examples described herein or in the order listed.

[0034] All features set forth in this specification and / or claims are intended to be disclosed independently of the structure of the features set forth in the embodiments and / or claims, as a limitation on the disclosure of the original application and the specific matters set forth in the claims, and are disclosed separately and independently of each other. Furthermore, descriptions relating to all numerical ranges and groups or categories are intended to disclose the structure between them as a limitation on the disclosure of the original application and the specific matters set forth in the claims.

[0035] In one or more embodiments, a chainsaw may include: a saw chain; a guide bar on which the saw chain is mounted; a sprocket that causes the saw chain to travel along the periphery of the guide bar; a prime mover that causes the sprocket to rotate about an axis of rotation; a housing that houses the prime mover; a sprocket cover that covers the sprocket; and a guide member. A chain path for the saw chain to pass through can be formed by the guide bar, the housing, and the sprocket cover. The guide member may have: a first opposing surface disposed opposite to the saw chain within the chain path and having an arcuate shape centered on the axis of rotation when viewed from a direction along the axis of rotation; and a second opposing surface disposed opposite to the saw chain within the chain path and having an arcuate shape centered at a position offset relative to the axis of rotation when viewed from a direction along the axis of rotation. Alternatively, when the chainsaw is placed on a horizontal mounting surface, the angle between the straight line connecting the points where the first and second opposing surfaces meet and the axis of rotation, viewed from along the axis of rotation, and the horizontal plane, is in the range of -10° to 25°. Furthermore, regarding the "angle with the horizontal plane," if the point where the first and second opposing surfaces meet is located below the horizontal plane, the angle is set to positive; if the point where the first and second opposing surfaces meet is located above the horizontal plane, the angle is set to negative.

[0036] According to the above structure, at the point where the first and second opposing surfaces of the guide member connect, the passage area of ​​the chain path narrows, thus preventing chips from advancing into the depths of the chain path. Furthermore, according to the above structure, chips prevented from advancing into the depths of the chain path are discharged along the second opposing surface, which has an arc shape, thus preventing chip accumulation within the chain path. Moreover, according to the above structure, when the chainsaw is placed on a horizontal mounting surface, when viewed from the direction along the rotation axis, the angle between the line connecting the first and second opposing surfaces and the rotation axis and the horizontal plane is in the range of -10° to 25°, thus facilitating the downward discharge of chips prevented from advancing into the depths of the chain path under the influence of gravity.

[0037] In one or more embodiments, the guide member may also include a first guide member made of rubber material and having the first opposing surface. The first guide member may also be detachably mounted to the housing or the sprocket cover.

[0038] According to the above structure, even in the event of a collision between the saw chain and the first opposing surface, damage to the housing and sprocket cover can be suppressed because the first guide member absorbs the impact. Furthermore, according to the above structure, even if the first guide member is damaged, it can be easily replaced with a new one.

[0039] In one or more embodiments, the first opposing surface may reach vertically above the rotation axis when viewed from the direction along the rotation axis, with the chainsaw placed on the mounting surface.

[0040] According to the above structure, a larger area can be covered by the first opposing surface in the chain path, thus more reliably suppressing damage to the housing and sprocket cover caused by the collision of the saw chain.

[0041] In one or more embodiments, the guide member may include a second guide member made of rubber material and having the second opposing surface. The second guide member may also be detachably mounted to the housing or the sprocket cover.

[0042] According to the above structure, even in the event of a collision between the saw chain and the second opposing surface, damage to the housing and sprocket cover can be suppressed because the second guide member absorbs the impact. Furthermore, according to the above structure, even if the second guide member is damaged, it can be easily replaced with a new one.

[0043] In one or more embodiments, the first guide member and the second guide member may also be integrally formed without joints.

[0044] Based on the above structure, the number of parts in a chainsaw can be reduced.

[0045] In one or more embodiments, the radius of curvature of the second opposing surface may also be less than half the radius of curvature of the first opposing surface.

[0046] If the radius of curvature of the second opposing surface increases, the dimensions of the chainsaw along the length of the guide rod need to be increased accordingly. Based on the above structure, the dimensions of the chainsaw along the length of the guide rod can be reduced.

[0047] (Example)

[0048] like Figure 1 , Figure 2As shown, the chainsaw 2 of this embodiment includes a main body 4, a guide bar 6, and a saw chain 8. The guide bar 6 is an elongated plate-like member mounted to the main body 4, protruding forward from the main body 4. The guide bar 6 is made of a metal material such as iron. The saw chain 8 includes multiple interconnected cutters and is mounted along the periphery of the guide bar 6. A battery pack B is mounted on the main body 4. The chainsaw 2 uses electricity supplied from the battery pack B to drive the saw chain 8 to rotate along the periphery of the guide bar 6 to cut materials such as wood. Various guide bars can be installed as the guide bar 6 depending on the cutting operation. Figure 1 , Figure 2 In the example shown, the radius of curvature of the top end of the guide rod 6 is, for example, 10 mm. In this embodiment, the chainsaw 2 drives the saw chain 8 to rotate along the periphery of the guide rod 6 at a speed of, for example, 25.5 m / s. Furthermore, in the following description, in the case of… Figure 3 When the chainsaw 2 is placed on a horizontal surface S, the direction orthogonal to the surface S is called the vertical direction of the chainsaw 2. The direction obtained by projecting the length direction of the guide rod 6 onto the surface S is called the front-back direction of the chainsaw 2. The direction orthogonal to the vertical and front-back directions of the chainsaw 2 is called the left-right direction of the chainsaw 2. Furthermore, in addition to... Figures 1-3 In the accompanying drawings, the saw chain 8 is omitted for clarity.

[0049] like Figure 1 , Figure 2 As shown, the main body 4 includes a left side shell 10, a right side shell 12, a base component 14, a front handle 16, a front handguard 18, a brake cover 20, and a sprocket cover 22. The left side shell 10, right side shell 12, front handguard 18, brake cover 20, and sprocket cover 22 are, for example, made of resin materials such as polyamide resin. The base component 14 is, for example, made of a metal material such as magnesium alloy. Regarding the thermal conductivity of the base component 14, for example at a temperature of 300K, the thermal conductivity of the base component 14 is 10 W / m·K or higher, for example, 30 W / m·K or higher, for example, approximately 50 W / m·K. The front handle 16 is, for example, made of a metal material such as aluminum alloy.

[0050] The main body 4 comprises a main body shell 24, a rear handle 26, and a rear handguard 28. The main body shell 24 is composed of a left side shell 10, a right side shell 12, a base member 14, and a brake cover 20. The rear handle 26 and the rear handguard 28 are composed of the left side shell 10 and the right side shell 12. The base member 14 is mounted on the right side of the front portion of the right side shell 12. The brake cover 20 is mounted on the right side of the base member 14. The sprocket cover 22 is mounted on the right side of the brake cover 20.

[0051] The main body shell 24 has a generally rectangular parallelepiped shape along its length in the front-rear direction of the main body 4. For example... Figure 4As shown, a battery pack receiving portion 24a with an upward opening is formed at the rear of the main housing 24. A battery pack mounting portion 24b is provided on the inner right side surface of the battery pack receiving portion 24a, through which the battery pack B can be installed or removed by sliding it vertically. A recess 24c is formed at the upper end of the inner right side surface of the battery pack receiving portion 24a to facilitate the user's grip on the battery pack B during installation or removal.

[0052] The rear handle 26 extends rearward and downward from the upper part of the rear surface of the main body housing 24 and bends downward. The rear handle 26 has a generally circular cross-sectional shape. The rear handguard 28 extends rearward from the lower part of the rear surface of the main body housing 24 and connects to the lower end of the rear handle 26. The rear handguard 28 has a generally cuboid shape, with its left-right dimension smaller than its front-back dimension and its vertical dimension smaller than its left-right dimension. Figure 5 As shown, the rear handguard 28 has a shape that covers the entire rear handle 26 from below. The rear handguard 28 includes a first handguard portion 28a disposed directly below the rear handle 26 and a second handguard portion 28b extending to the right from the first handguard portion 28a. The rear handguard 28 can be used to protect the hand of the user holding the rear handle 26.

[0053] A power button 30 is located on the upper surface near the front end of the rear handle 26, allowing the user to switch the power supply of the chainsaw 2 on / off. For example... Figure 6 As shown, a power switch 32 is located inside the rear handle 26. This power switch 32 detects the user's operation of the power button 30. The power switch 32 is electrically connected to the control unit 34, which will be described later.

[0054] A trigger lever 36 for the user to operate the rotation drive of the saw chain 8 is disposed on the lower surface near the front end of the rear handle 26. The trigger lever 36 is supported on the rear handle 26 in such a way that it can rotate about a rotation axis 36a extending in the left-right direction. A trigger switch 38 is provided inside near the rear end of the main body housing 24. The trigger switch 38 detects the user's pulling operation of the trigger lever 36. The trigger switch 38 is electrically connected to the control unit 34.

[0055] A locking lever 40 is disposed on the upper surface of the rear handlebar 26, switching between a state that allows the user to operate the trigger lever 36 and a state that prevents the user from operating the trigger lever 36. The locking lever 40 is supported on the rear handlebar 26 in a manner that allows rotation about a rotation axis 40a extending in the left-right direction. When the locking lever 40 is rotated to the upper position, the locking lever 40 interferes with the trigger lever 36, thereby preventing the trigger lever 36 from rotating upward. When the locking lever 40 is rotated to the lower position, the locking lever 40 does not interfere with the trigger lever 36, thereby allowing the trigger lever 36 to rotate upward. A grip detection switch 42 is disposed inside near the front end of the rear handlebar 26, which detects the user's downward pressing operation on the locking lever 40. The grip detection switch 42 is electrically connected to the control unit 34.

[0056] The trigger lever 36 and the locking lever 40 are connected to each other by a torsion spring 44. The torsion spring 44 exerts a force on the trigger lever 36 in a downward direction and on the locking lever 40 in a upward direction. Therefore, when the user's hand leaves the trigger lever 36, the force of the torsion spring 44 causes the trigger lever 36 to rotate to the downward position. Similarly, when the user's hand leaves the locking lever 40, the force of the torsion spring 44 causes the locking lever 40 to rotate to the upward position.

[0057] like Figure 1 , Figure 2 As shown, the front handle 16 includes a right-side fixing portion 16a extending forward and upward, an upper-side grip portion 16b extending from the upper end of the right-side fixing portion 16a towards the left front, a left-side grip portion 16c extending from the left end of the upper-side grip portion 16b towards the downward, and a lower-side fixing portion 16d extending from the lower end of the left-side grip portion 16c towards the right. The upper-side grip portion 16b and the left-side grip portion 16c have a generally circular cross-sectional shape. Figure 1 As shown, the right-side fixing part 16a, when inserted into the right-side handle mounting groove 24d formed on the right side of the main body housing 24 (specifically, the right side of the right-side housing 12), is fixed to the main body housing 24 (specifically, the right-side housing 12) by fasteners. Figure 2 As shown, the lower fixing part 16d is fixed to the main body housing 24 (specifically the left side housing 10) by fasteners when it enters the lower handle mounting groove 24e formed on the lower surface near the front end of the main body housing 24 (specifically the lower surface of the left side housing 10).

[0058] When using chainsaw 2, the user holds the rear handle 26 with their right hand and the front handle 16 (specifically, the upper grip 16b or the left grip 16c) with their left hand to maintain the chainsaw 2. If, from this state, the user presses down on the locking lever 40 of the rear handle 26 with their right palm, the user is allowed to operate the trigger lever 36. In this state, the user pulls up the trigger lever 36 with their right index finger, thereby driving the saw chain 8 to rotate.

[0059] like Figure 6 As shown, a control unit 34, a motor 46, an oil tank 48, and an oil pump 50 are arranged at the front of the interior of the main housing 24. The control unit 34, motor 46, oil tank 48, and oil pump 50 are positioned forward of the battery pack B. The oil tank 48 is positioned forward of the motor 46 and oil pump 50. The control unit 34 is positioned above the motor 46, oil tank 48, and oil pump 50, arranged along both the front-back and left-right directions.

[0060] like Figure 7 As shown, motor 46 is an internal rotor type DC brushless motor. Motor 46 includes a stator 54 with coils 52 wound around it, a rotor 58 disposed inside the stator 54 and having permanent magnets 56, an output shaft 60 disposed through the center of the stator 54 and fitted into the rotor 58, a cooling fan 62 fitted into the output shaft 60, and a sensor substrate 64 for detecting the rotation of the rotor 58.

[0061] The base member 14 includes a base plate 14a extending in the front-rear and vertical directions, and a generally cylindrical support rib 14b projecting to the left from the base plate 14a. The base plate 14a and the support rib 14b are integrally formed without joint. Figure 8 As shown, a motor housing 66 is fixed to the left end of the support rib 14b by fasteners. The motor housing 66 is made of a resin material such as polyamide resin. Figure 7 As shown, the sensor substrate 64 is disposed opposite to the left end face of the stator 54. The motor housing 66 has a shape that covers the radially outer side of the stator 54, the left end face of the stator 54, and the sensor substrate 64. The stator 54 and the sensor substrate 64 are fixed to the motor housing 66 by means of fasteners. The coil 52 wound on the stator 54 and the sensor substrate 64 are respectively connected to the control unit 34 (see reference). Figure 6 Electrical connection. The control unit 34 includes a circuit board and a generally cuboid housing that houses the circuit board. The circuit board houses an inverter circuit including switching elements and a control circuit that controls the operation of each switching element, though these are not shown. The control unit 34 controls the voltage applied to the coil 52 based on the detection signal from the sensor board 64, thereby controlling the operation of the motor 46.

[0062] like Figure 7As shown, the output shaft 60 is arranged along the left-right direction of the chainsaw 2. The right end of the output shaft 60 passes through the right side housing 12, the base plate 14a, and the brake cover 20, and protrudes to the right beyond the brake cover 20. The left end of the output shaft 60 passes through the left side of the motor housing 66 and protrudes to the left beyond the left side of the motor housing 66. The output shaft 60 is rotatably supported on the base plate 14a via bearing 68, and rotatably supported on the motor housing 66 via bearing 70. The rotor 58 is positioned to the right of the bearing 70, the cooling fan 62 is positioned to the right of the rotor 58, and the bearing 68 is positioned to the right of the cooling fan 62.

[0063] The cooling fan 62 is, for example, a centrifugal fan, or a plate fan comprising a disc-shaped plate 62a and a plurality of blades 62b protruding from the plate 62a. Figure 8 As shown, an air supply opening 66a is formed on the left side of the motor housing 66. An exhaust opening 14c is formed on the support rib 14b of the base member 14. Additionally, as... Figure 2 As shown, an air supply port 24f is formed on the left side of the main body housing 24 (specifically, the left side of the left housing 10), and an exhaust port 24g is formed on the lower surface of the main body housing 24 (specifically, the lower surface of the right housing 12). Figure 9 As shown, the exhaust port 24g is configured opposite to the exhaust opening 14c.

[0064] When the cooling fan 62 rotates, the air outside the main housing 24 is circulated through... Figure 2 The air inlet 24f shown flows into the interior of the main housing 24. The air flowing into the interior of the main housing 24 is... Figure 7 The air supply opening 66a shown flows into the interior of the motor housing 66. The air flowing into the interior of the motor housing 66 passes through the sensor substrate 64 and flows in the gap between the stator 54 and the rotor 58, cooling both the stator 54 and the rotor 58 before reaching the cooling fan 62. Figure 9 As shown, the air reaching the cooling fan 62 flows radially outward along the blades 62b, then flows circumferentially along the inner surface of the support rib 14b. After cooling the base component 14, the air flows outward to the outside of the main housing 24 through the exhaust opening 14c and the exhaust port 24g.

[0065] like Figure 7 As shown, a sprocket 72 and a brake base 74 are fixed near the right end of the output shaft 60. The sprocket 72 and the brake base 74 are positioned to the right of the bearing 68. A brake drum 76 is fitted into the brake base 74.

[0066] like Figure 10 As shown, sprocket 72 is exposed on the outside of brake cover 20. A saw chain 8 (see reference) is mounted from guide rod 6 to sprocket 72. Figures 1-3 ). In motor 46 (refer to) Figure 7 When driven, the sprocket 72 rotates together with the output shaft 60, thereby causing the saw chain 8 to rotate around the sprocket 72 and the guide rod 6.

[0067] An elongated hole 6a extending along the length of the guide rod 6 is formed therein. The guide rod 6 is supported to the base member 14 by bolts 78 and 80 passing through the elongated hole 6a. Figure 7 As shown, bolts 78 and 80 are fixed to the base plate 14a. Nuts 82 and 84 are tightened from the outside of the sprocket cover 22 onto bolts 78 and 80. With nuts 82 and 84 loosened, the user can adjust the tension of the saw chain 8 by sliding the guide rod 6 along the elongated hole 6a, thereby changing the distance between the guide rod 6 and the sprocket 72.

[0068] like Figure 10 As shown, the guide rod 6 has an engagement hole 88 that engages with the engagement pin 86. For example... Figure 11 As shown, the locking pin 86 is connected to the adjusting screw 92 via a rotary-to-linear conversion mechanism 90. The rotary-to-linear conversion mechanism 90 converts the rotational motion of the adjusting screw 92 into the linear motion of the locking pin 86 along the direction of the elongated hole 6a. Figure 10 As shown, the adjusting screw 92 is positioned between bolts 78 and 80, and passes through the elongated hole 6a in a manner that does not contact the inner circumferential surface of the elongated hole 6a. When the user rotates the adjusting screw 92, the engaging pin 86 moves in the direction along the elongated hole 6a of the guide rod 6, and the guide rod 6 slides in the direction along the elongated hole 6a.

[0069] like Figure 7 As shown, sprocket 72 is covered by sprocket cover 22. Figure 1 As shown, an outer cover 94 is installed on the right side near the front end of the sprocket cover 22. The outer cover 94 includes a recess 94a facing left. In the recess 94a are formed fastening openings 94b and 94c for external contact with nuts 82 and 84 fastened to bolts 78 and 80, and an adjusting opening 94d for external contact with adjusting screw 92. The user can tighten or loosen nuts 82 and 84 while the sprocket cover 22 is installed. Furthermore, the user can adjust the tension of the saw chain 8 by rotating the adjusting screw 92 via the adjusting opening 94d while the sprocket cover 22 is installed.

[0070] like Figure 7As shown, a sleeve 96 is provided on the sprocket cover 22. The sleeve 96 is made of a metal material such as aluminum and is integrally formed with the sprocket cover 22 by injection molding. The sleeve 96 includes bolt openings 96a and 96b for bolts 78 and 80 to pass through, and an adjusting screw opening 96c for adjusting screws 92 to be inserted. When nuts 82 and 84 are tightened to bolts 78 and 80, the guide rod 6 and the sleeve 96 are clamped and fixed between nuts 82 and 84 and the base plate 14a. Since the sleeve 96 bears the load applied to the sprocket cover 22 when nuts 82 and 84 are tightened, damage to the sprocket cover 22 can be prevented even when nuts 82 and 84 are firmly tightened.

[0071] like Figure 12 As shown, chain guides 98 and 100 are installed on the right side of the base plate 14a. Figure 11 As shown, chain guide 98 is positioned above bolts 78 and 80 and adjusting screw 92. Chain guide 100 is positioned below bolts 78 and adjusting screw 92. Chain guides 98 and 100 are made of resin materials such as polyacetal resin. Figure 13 As shown, a saw chain 8 is formed between the main housing 24 and the sprocket cover 22 (see reference). Figures 1-3 The chain path 99 is through which the saw chain 8 passes. By providing the chain guide 98, the saw chain 8 passing through the chain path 99 on the upper side of the guide rod 6 (see reference) can be suppressed. Figures 1-3 The saw chain 8 tilts to the left and detaches from the guide rod 6. Additionally, when using the chainsaw 2 for cutting operations, chips sometimes enter the chain passage 99 as the saw chain 8 rotates. However, by providing the chain guide 98, the passage area of ​​the chain passage 99 above the guide rod 6 can be reduced, thus preventing chips from advancing deeper into the chain passage 99. Furthermore, by providing the chain guide 100, the saw chain 8 (see reference 100) can be prevented from passing through the chain passage 99 below the guide rod 6. Figures 1-3 It tilted to the left and detached from the guide rod 6.

[0072] like Figure 12As shown, the chain guide 98 includes a generally flat guide portion 98a and a locking portion 98b protruding to the left from the guide portion 98a. The chain guide 100 includes a generally flat guide portion 100a and a locking portion 100b protruding to the left from the guide portion 100a. A guide mounting portion 102 for detachably mounting the chain guide 98 and a guide mounting portion 104 for detachably mounting the chain guide 100 are formed on the right side of the base plate 14a. The guide mounting portion 102 includes a mounting groove 102a for receiving the guide portion 98a and a locked portion 102b for locking the locking portion 98b. The guide mounting portion 104 includes a mounting groove 104a for receiving the guide portion 100a and a locked portion 104b for locking the locking portion 100b. With this structure, even if the chain guides 98 and 100 are damaged due to contact with the saw chain 8, it is easy to replace them with new chain guides 98 and 100.

[0073] A chain catcher 106 is fixed to the bottom of the guide mounting portion 104 of the base plate 14a by fasteners. The chain catcher 106 is made of a metal material such as aluminum alloy. By providing the chain catcher 106, even if the rotating saw chain 8 falls off the guide bar 6, it can prevent the saw chain 8 from flying towards the user.

[0074] A pointed object 108 is fixed to the front end of the base plate 14a by fasteners. The pointed object 108 is made of, for example, a metallic material such as iron. Figure 1 , Figure 2 As shown, the pointed object 108 protrudes forward from the front surface of the main body housing 24. When the user uses the chainsaw 2 to cut wood or other materials, the pointed object 108 can be inserted into the material as a fulcrum to ensure stable cutting operations.

[0075] like Figure 14 As shown, chain guides 110 and 112 are installed on the left side of the sprocket cover 22. Chain guide 110 is positioned above the sleeve 96. Chain guide 112 is positioned below the sleeve 96. Chain guides 110 and 112 are made of resin materials such as polyacetal resin. Figure 13 As shown, by providing the chain guide 110, the saw chain 8 passing through the chain passage 99 on the upper side of the guide rod 6 can be prevented from tilting to the right and falling off the guide rod 6. Furthermore, by providing the chain guide 110, the passage area of ​​the chain passage 99 on the upper side of the guide rod 6 can be reduced, thus preventing chips from advancing into the depth of the chain passage 99. Moreover, by providing the chain guide 112, the saw chain 8 passing through the chain passage 99 on the lower side of the guide rod 6 can be prevented from tilting to the right and falling off the guide rod 6.

[0076] like Figure 15As shown, chain guide 110 includes a generally flat guide portion 110a and an engaging portion 110b protruding to the right from the guide portion 110a. Chain guide 112 includes a generally flat guide portion 112a and an engaging portion 112b protruding to the right from the guide portion 112a. Figure 16 As shown, a guide mounting portion 114 for detachably mounting the chain guide 110 and a guide mounting portion 116 for detachably mounting the chain guide 112 are formed on the left side of the sprocket cover 22. The guide mounting portion 114 includes a mounting groove 114a for receiving the guide portion 110a and a engaged portion 114b for engaging with the engaging portion 110b. The guide mounting portion 116 includes a mounting groove 116a for receiving the guide portion 112a and a engaged portion 116b for engaging with the engaging portion 112b. With this structure, even if the chain guides 110 and 112 are damaged due to contact with the saw chain 8, replacement with new chain guides 110 and 112 can be easily performed.

[0077] like Figure 14 As shown, a debris guide 118 is also installed on the left side of the sprocket cover 22. The debris guide 118 is made of, for example, a rubber material such as nitrile rubber. Figure 15 As shown, the debris guide 118 includes a first guide portion 120, a second guide portion 122, a third guide portion 124, and a support portion 126. The first guide portion 120, the second guide portion 122, the third guide portion 124, and the support portion 126 are integrally formed without joints. The first guide portion 120 includes a guide surface 120a formed in a generally cylindrical shape. The radius of curvature of the guide surface 120a is in the range of 24 mm to 36 mm, for example, 30 mm. The second guide portion 122 includes a guide surface 122a formed in a generally cylindrical shape and a guide surface 122b formed in a generally planar shape. The radius of curvature of the guide surface 122a is in the range of 4 mm to 10 mm, for example, 6 mm. The length of the guide surface 122b in the longitudinal direction is in the range of 30 mm to 40 mm, for example, 34 mm. Guide surface 122a is connected to guide surface 120a at one end and to guide surface 122b at the other end. The third guide portion 124 includes guide surface 124a, which is generally cylindrical, and guide surface 124b, which is generally planar. The radius of curvature of guide surface 124a is in the range of 3 mm to 7 mm, for example, 5 mm. The length of guide surface 124b in the longitudinal direction is in the range of 14 mm to 25 mm, for example, 18 mm. Guide surface 124a is connected to guide surface 122b at one end and to guide surface 124b at the other end. Support portion 126 includes engaging holes 126a, 126b, and 126c. Figure 16As shown, a guide mounting portion 128 is formed on the left side of the sprocket cover 22, on which the chip guide 118 can be detachably mounted. The guide mounting portion 128 includes engaging pins 128a, 128b, and 128c that engage with engaging holes 126a, 126b, and 126c. With this structure, even if the chip guide 118 is damaged due to contact with the saw chain 8, it can be easily replaced with a new chip guide 118. Furthermore, as... Figure 14 As shown, a generally flat guide rib 22a protruding to the left is formed on the left side of the sprocket cover 22. When the debris guide 118 is installed on the sprocket cover 22, the lower surface of the guide rib 22a and the guide surface 120a are configured in a manner that is generally without steps and with generally no gaps.

[0078] like Figure 17As shown, with the sprocket cover 22 installed on the main housing 24, the guide rib 22a is positioned above and in front of the sprocket 72, the first guide portion 120 is positioned above and in rear of the sprocket 72, and the second guide portion 122 and the third guide portion 124 are positioned below and in rear of the sprocket 72. When the chainsaw 2 is viewed from the right, the center C1 of the curvature circle of the guide surface 120a of the first guide portion 120 is approximately aligned with the center C0 of the output shaft 60. When the chainsaw 2 is viewed from the right, the center C2 of the curvature circle of the guide surface 122a of the second guide portion 122 is offset rearward and downward relative to the center C1 of the curvature circle of the guide surface 120a of the first guide portion 120. The amount by which the center C2 of the curvature circle of the guide surface 122a is offset rearward from the center C1 of the curvature circle of the guide surface 120a is in the range of 24 mm to 38 mm, for example, 31 mm. When viewing the chainsaw 2 from the right, the angle θ1 formed by the straight line L1 connecting the connection point P1 of guide surface 120a and guide surface 122a and the center C0 of output shaft 60 with the horizontal plane is within the range of -10° ≤ θ1 ≤ 25°. Here, θ1 is positive when P1 is located below C0, and negative when P1 is located above C0. For example, in this embodiment, θ1 = 6°. When viewing the chainsaw 2 from the right, the center C3 of the curvature circle of the guide surface 124a of the third guide portion 124 is offset backward and downward relative to the center C2 of the curvature circle of the guide surface 122a of the second guide portion 122. The amount by which the center C3 of the curvature circle of guide surface 124a is offset backward from the center C2 of the curvature circle of guide surface 122a is in the range of 10mm to 30mm, for example, 19mm. When viewing the chainsaw 2 from the right, the angle between the straight line L2 connecting the connection point P2 of guide surface 122a and guide surface 124a and the center C0 of output shaft 60 and the horizontal plane H is θ2, which falls within the range of 32° ≤ θ2 ≤ 50°. Here, θ2 is positive when P2 is located below C0, and negative when P2 is located above C0. For example, in this embodiment, θ2 = 41°.

[0079] By arranging the guide rib 22a as described above, the passage area of ​​the chain passage 99 above the front of the sprocket 72 can be reduced, thus preventing chips from advancing into the depth of the chain passage 99. Furthermore, by arranging the first guide portion 120 as described above, the passage area of ​​the chain passage 99 above the rear of the sprocket 72 can be reduced, further preventing chips from advancing into the depth of the chain passage 99. Moreover, by arranging the second guide portion 122 as described above, chips entering the chain passage 99 can be easily discharged rearward and downward. By arranging the third guide portion 124 as described above, chips entering the chain passage 99 can be discharged rearward and downward even more easily.

[0080] like Figure 1As shown, the front handguard 18 includes a handguard portion 18a, a left support portion 18b, and a right support portion 18c. (As...) Figure 5 As shown, the hand guard 18a is positioned in front of the upper grip portion 16b of the front handle 16 to protect the hand of the user holding the upper grip portion 16b. Figure 2 As shown, the left support portion 18b extends rearward and downward from the lower left end of the handguard portion 18a. Near its lower end, the left support portion 18b is positioned around a rotation axis 18d that extends in the left-right direction (see reference). Figure 8 The rotation method remains within the left side housing 10. (As shown...) Figure 11 As shown, the right-side support portion 18c extends downward from the right end of the handguard portion 18a. Near its lower end, the right-side support portion 18c is held in place of the base plate 14a in a manner that allows it to rotate about a rotation axis 18e extending in the left-right direction. The rotation axis 18d (see reference...) Figure 8 The front handguard 18 and the rotating shaft 18e are arranged on approximately the same straight line. Therefore, the front handguard 18 can rotate relative to the main housing 24 between a normally upright position and a stopped position where it is pushed forward. Furthermore, as... Figure 8 As shown, a stop detection switch 129 is provided on the left side of the base plate 14a. The stop detection switch 129 detects whether the front handguard 18 is in the stop position. The stop detection switch 129 and the control unit 34 (see reference) Figure 6 Electrical connection.

[0081] like Figure 11 As shown, a locking member 130 and a compression spring 132 are provided on the right side of the base plate 14a. The locking member 130 includes a protrusion 130a that enters a recess 18f formed in the right support portion 18c of the front handguard 18. The compression spring 132 applies a force to the locking member 130 relative to the base plate 14a in the direction in which the protrusion 130a enters the recess 18f. Therefore, even if a force in the forward pushing direction is applied to the front handguard 18, if the force is less than a predetermined value, the force of the compression spring 132 maintains the state in which the protrusion 130a enters the recess 18f, thereby keeping the front handguard 18 in its normal position. On the other hand, if the force is greater than the predetermined value, the protrusion 130a overcomes the force of the compression spring 132 and disengages from the recess 18f, causing the front handguard 18 to rotate from its normal position to its stop position.

[0082] On the right side of the base plate 14a, there are also an arm member 134, a connecting rod member 136, a brake member 138, a brake band 140, and a compression spring 142. One end of the arm member 134 is fixed to the right support portion 18c of the front handguard 18. The other end of the arm member 134 is rotatably connected to one end of the connecting rod member 136. The other end of the connecting rod member 136 is rotatably connected to the brake member 138. The brake member 138 is held in the base plate 14a in a manner that allows it to slide between a normal position at the rear lower position and a stop position at the front upper position. The brake band 140 is arranged to surround the brake drum 76. One end of the brake band 140 is held to the brake member 138. The other end of the brake band 140 is fixed to the base plate 14a. When the front handguard 18 rotates from its normal position to its stop position, the arm member 134 also rotates together with the front handguard 18. This causes the arm member 134 and the connecting rod member 136 to bend, and the brake member 138 moves from its normal position to its stop position. As a result, the brake band 140 narrows, and its inner circumferential surface abuts against the outer circumferential surface of the brake drum 76, using the friction between them to brake the rotation of the output shaft 60. When the front handguard 18 rotates from its stop position to its normal position, the arm member 134 also rotates together with the front handguard 18. This causes the arm member 134 and the connecting rod member 136 to be aligned in a roughly straight line, and the brake member 138 moves from its stop position to its normal position. This causes the brake band 140 to widen, and its inner circumferential surface separates from the outer circumferential surface of the brake drum 76, releasing the brake on the rotation of the output shaft 60.

[0083] The compression spring 142 applies force to the brake member 138 from its normal position toward its stop position. With the front handguard 18 in its normal position and the arm member 134 and link member 136 arranged in a generally straight line, the brake member 138 remains in its normal position even when the force of the compression spring 142 acts on it. However, when the chainsaw 2 is impacted by the recoil during cutting, the arm member 134 and link member 136 bend slightly, and the force of the compression spring 142 moves the brake member 138 from its normal position toward its stop position. This causes the front handguard 18 to rotate from its normal position toward its stop position, and the friction between the brake band 140 and the brake drum 76 brakes the rotation of the output shaft 60.

[0084] exist Figure 6 The oil tank 48 shown stores lubricating oil for lubricating the saw chain 8. The oil tank 48 is provided with a cover 144, which is accessible from a replenishment opening 48a (see reference 48a) for adding lubricating oil to the oil tank 48. Figure 7 Disassembly and assembly. (e.g.) Figure 2 As shown, the cover 144 of the fuel tank 48 is exposed outside the left side housing 10 and is located on the left side of the front part of the main housing 24.

[0085] Figure 6 The oil pump 50, as shown, rotates in conjunction with the motor 46 to draw lubricating oil from inside the oil tank 48 via the inlet pipe 146, and delivers the lubricating oil towards the guide rod 6 via the outlet pipe 148. The lubricating oil delivered to the outlet pipe 148 passes through the oil supply port 14d formed on the base plate 14a (see reference). Figure 11 Guide rod 6 and saw chain 8 (see reference) Figures 1-3 Supply. A worm gear 150 for driving the oil pump 50 is fitted near the left end of the output shaft 60 of the motor 46. (Example) Figure 7 As shown, the worm gear 150 is positioned to the left of the bearing 70. This can be achieved using the adjusting pin 152 (see reference). Figure 9 Adjust the discharge rate of lubricating oil supplied from oil tank 48 to guide rod 6 by oil pump 50.

[0086] like Figure 2 As shown, an adjustment opening 24h is formed on the lower surface of the main body housing 24 (specifically, the lower surface of the left side housing 10), allowing external contact with the adjustment pin 152. The user can adjust the flow rate of the lubricating oil from the oil pump 50 by inserting a tool through the adjustment opening 24h and rotating the adjustment pin 152. In the left-right direction of the chainsaw 2, the adjustment opening 24h is located near the left end of the main body housing 24.

[0087] A battery pack receiving portion 24a (see reference 24a) is formed on the lower surface of the main housing 24 (specifically, the lower surface of the left housing 10). Figure 4 The drain hole 24i is connected to the battery pack housing 24a. Therefore, even if water enters the battery pack housing 24a, it can be drained through the drain hole 24i. Furthermore, as... Figure 18 As shown, a drain hole 24j communicating with the interior of the main body housing 24 is formed in the handle mounting groove 24d on the right side of the main body housing 24. Therefore, even if water enters the interior of the main body housing 24, it can be drained through the drain hole 24j by tilting the chainsaw 2 to the right. In addition, since the drain hole 24j is located in a less conspicuous position, it does not affect the aesthetics of the chainsaw 2. Furthermore, since the drain hole 24j is located away from the guide rod 6, it can prevent chips from entering the interior of the main body housing 24 through the drain hole 24j.

[0088] In the chainsaw 2 of this embodiment, the volume of the base component 14 is 400 cm³. 3 The above, for example, is 500cm 3 The above, for example, is approximately 550cm. 3Furthermore, the weight of the base component 14 is more than 2%, for example more than 3%, or for example about 4%, of the total weight of the chainsaw 2, including the guide rod 6, the saw chain 8, and the battery pack B. By using such a large and heavy base component 14, the heat capacity of the base component 14 can be increased, and the temperature rise of the base component 14 can be suppressed.

[0089] In the chainsaw 2 of this embodiment, the space housing the motor 46 and the space through which the saw chain 8 passes are separated by the base member 14. By configuring it in this way, it is possible to prevent chips from reaching the motor 46 and affecting the operation of the motor 46.

[0090] (Modified Example)

[0091] Alternatively, chainsaw 2 may not have battery pack B installed, but instead be powered via a power cord.

[0092] Motor 46 can also be an external rotor type DC brushless motor. Alternatively, motor 46 can be a brushed motor or other types of electric motors.

[0093] The chainsaw 2 may also include an engine with an internal combustion engine instead of the motor 46 as the prime mover to rotate the sprocket 72. In this case, it may also be configured such that the output shaft 60 connected to the sprocket 72 is rotated by the drive of the engine.

[0094] The material of the base component 14 is not limited to magnesium alloy. It can be any thermally conductive material with a thermal conductivity of 10 W / m·K or higher at a temperature of 300 K. For example, it can be austenitic stainless steel or other metallic materials, or it can be a non-metallic material.

[0095] The debris guide 118 may not be installed on the left side of the sprocket cover 22, but can be detachably installed on the right side of the main body housing 24 (specifically, the right side of the brake cover 20). Furthermore, the debris guide 118 may not include the third guide portion 124. Moreover, in the debris guide 118, the first guide portion 120, the second guide portion 122, and the third guide portion 124 can be formed as independent components, and can be individually detached from the sprocket cover 22 or the main body housing 24.

[0096] As described above, in one or more embodiments, the chainsaw 2 includes: a saw chain 8; a guide bar 6 on which the saw chain 8 is mounted; a sprocket 72 that causes the saw chain 8 to travel along the periphery of the guide bar 6; a motor 46 (an example of a prime mover) that causes the sprocket 72 to rotate about a rotation axis C0; a main body housing 24 (an example of a housing) that houses the motor 46; a sprocket cover 22 that covers the sprocket 72; and a chip guide 118 (an example of a guide member). The guide bar 6, the main body housing 24, and the sprocket cover 22 form a chain passage 99 for the saw chain 8 to pass through. The chip guide 118 has: a guide surface 120a (an example of a first opposing surface) which is configured opposite to the saw chain 8 within the chain passage 99 and has an arcuate shape centered on the rotation axis C0 when viewed from the direction along the rotation axis C0 (e.g., the left-right direction); and a guide surface 122a (an example of a second opposing surface) which is configured opposite to the saw chain 8 within the chain passage 99 and has an arcuate shape centered on a position C2 offset relative to the rotation axis C0 when viewed from the direction along the rotation axis C0 (e.g., the left-right direction). When the chainsaw 2 is placed on a horizontal mounting surface S, the angle between the straight line L1 connecting the position P1 where the guide surfaces 120a and 122a meet and the rotation axis C0, and the horizontal plane H, is in the range of -10° to 25° when viewed from the direction along the rotation axis C0 (e.g., the left-right direction).

[0097] According to the above structure, at position P1 where the guide surfaces 120a and 122a of the chip guide 118 connect, the passage area of ​​the chain passage 99 narrows, thus preventing chips from advancing into the depth of the chain passage 99. Furthermore, according to the above structure, chips prevented from advancing into the depth of the chain passage 99 are discharged along the arc-shaped guide surface 122a, thus preventing chip accumulation within the chain passage 99. Moreover, according to the above structure, when the chainsaw 2 is placed on a horizontal mounting surface S, when viewed from the direction along the rotation axis C0 (e.g., left-right direction), the angle between the straight line L1 connecting position P1 where the guide surfaces 120a and 122a connect and the rotation axis C0 and the horizontal plane H is in the range of -10° to 25°, thus facilitating the downward discharge of chips prevented from advancing into the depth of the chain passage 99 under the influence of gravity.

[0098] In one or more embodiments, the debris guide 118 includes a first guide portion 120 (an example of a first guide member), which is made of rubber material and has a guide surface 120a. The first guide portion 120 can be detachably mounted to the main housing 24 or the sprocket cover 22.

[0099] According to the above structure, even if the saw chain 8 collides with the guide surface 120a, the first guide portion 120 absorbs the impact, thus suppressing damage to the main body housing 24 and the sprocket cover 22. Furthermore, according to the above structure, even if the first guide portion 120 is damaged, a new first guide portion 120 can be easily replaced.

[0100] In one or more embodiments, when the chainsaw 2 is placed on the mounting surface S, when viewed from the direction along the rotation axis C0 (e.g., the left-right direction), the guide surface 120a reaches vertically above the rotation axis C0.

[0101] According to the above structure, the guide surface 120a can cover a larger area in the chain passage 99, thus more reliably suppressing damage to the main body housing 24 and sprocket cover 22 caused by the collision of the saw chain 8.

[0102] In one or more embodiments, the debris guide 118 includes a second guide portion 122 (an example of a second guide member), which is made of rubber material and has a guide surface 122a. The second guide portion 122 can be detachably mounted to the main housing 24 or the sprocket cover 22.

[0103] According to the above structure, even if the saw chain 8 collides with the guide surface 122a, the second guide portion 122 absorbs the impact, thus suppressing damage to the main body housing 24 and the sprocket cover 22. Furthermore, according to the above structure, even if the second guide portion 122 is damaged, a new second guide portion 122 can be easily replaced.

[0104] In one or more embodiments, the first guide portion 120 and the second guide portion 122 are integrally formed without joints.

[0105] Based on the above structure, the number of parts in chainsaw 2 can be reduced.

[0106] In one or more embodiments, the radius of curvature of the guide surface 122a is less than half the radius of curvature of the guide surface 120a.

[0107] If the radius of curvature of the guide surface 122a increases, the size of the chainsaw 2 along the length of the guide rod 6 needs to be increased accordingly. Based on the above structure, the size of the chainsaw 2 along the length of the guide rod 6 can be reduced.

Claims

1. A chainsaw, wherein, The chainsaw includes: Saw chain; Guide rod, on which the saw chain is mounted; A sprocket that causes the saw chain to travel along the periphery of the guide bar; Prime mover, which causes the sprocket to rotate about the axis of rotation; A housing that contains the prime mover; Sprocket cover, which covers the sprocket; and Guide components, The guide rod, the housing, and the sprocket cover form a chain path for the saw chain to pass through. The guiding member has: The first opposing face, which is configured opposite to the saw chain within the chain path, and has an arc shape centered on the axis of rotation when viewed from a direction along the axis of rotation; and The second opposing surface, which is configured opposite to the saw chain within the chain path, has an arc shape centered at a position offset relative to the rotation axis when viewed from a direction along the rotation axis. With the chainsaw placed on a horizontal mounting surface, when viewed from the direction along the axis of rotation, the angle between the straight line connecting the first opposing surface and the second opposing surface to the axis of rotation and the horizontal plane is in the range of -10° to 25°.

2. The chainsaw according to claim 1, wherein, The guiding member includes a first guiding member, which is made of rubber material and has the first opposing surface. The first guide member can be detachably installed on the housing or the sprocket cover.

3. The chainsaw according to claim 2, wherein, With the chainsaw placed on the mounting surface, when viewed from the direction along the axis of rotation, the first opposing surface reaches vertically above the axis of rotation.

4. The chainsaw according to claim 2 or 3, wherein, The guiding member includes a second guiding member, which is made of rubber material and has the second opposing surface. The second guide member can be detachably installed on the housing or the sprocket cover.

5. The chainsaw according to claim 4, wherein, The first guide member and the second guide member are integrally formed without any joints.

6. The chainsaw according to any one of claims 1 to 3, wherein, The radius of curvature of the second opposing surface is less than half the radius of curvature of the first opposing surface.

7. The chainsaw according to claim 4, wherein, The radius of curvature of the second opposing surface is less than half the radius of curvature of the first opposing surface.

8. The chainsaw according to claim 5, wherein, The radius of curvature of the second opposing surface is less than half the radius of curvature of the first opposing surface.

Images