JP2020179523A - Chain saw - Google Patents

Abstract

To inhibit chips from accumulating in a housing and causing a trouble in action of a brake mechanism.SOLUTION: A chain saw 2 includes: a prime mover which rotates a saw chain; a brake mechanism 104 which stops rotation of the saw chain; a housing 4 having a first space, in which the prime mover is disposed, and a second space 92, in which a brake mechanism 104 is disposed, therein; and an operation member 100. The housing 4 has a through hole 98 which allows the second space 92 and the outside of the housing 4 to communicate with each other. The operation member 100 is disposed spanned between the second space 92 and the outside of the housing 4 through the through hole 98. The brake mechanism 104 includes a connection member 105 which moves in the second space 92 in conjunction with movement of the operation member 100. The housing 4 has an opening 94 that allows the first space and the second space 92 to communicate with each other and inhibits chips from accumulating in the second space 92.SELECTED DRAWING: Figure 7

Description

The techniques disclosed herein relate to chainsaws.

Patent Document 1 discloses a chainsaw. The chainsaw includes a prime mover that rotates the saw chain, a brake mechanism that stops the rotation of the saw chain, a first space in which the prime mover is arranged, a housing having a second space in which the brake mechanism is arranged, and a brake. It includes an operating member for operating the mechanism. The housing has a through hole that communicates the second space with the outside of the housing. The operating member is arranged so as to straddle the second space and the outside of the housing through the through hole. The operating member is movable between a brake position that operates the brake mechanism so as not to hinder the rotation of the saw chain and a drive position that operates the brake mechanism so as not to hinder the rotation of the saw chain. The brake mechanism includes a connecting member that moves in the second space in conjunction with the movement of the operating member.

Japanese Unexamined Patent Publication No. 2016-101626

In a chainsaw as described above, the through hole is designed to be slightly larger than the cross section of the operating member. Therefore, debris generated when cutting an object to be cut such as wood using a chainsaw passes through the through hole and invades the second space. Accumulation of such debris in the second space interferes with the operation of the brake mechanism. The present specification provides a technique capable of suppressing the accumulation of debris in the housing and hindering the operation of the brake mechanism.

This specification discloses a chainsaw. The chainsaw includes a prime mover that rotates the saw chain, a brake mechanism that stops the rotation of the saw chain, a housing that has a first space in which the prime mover is arranged and a second space in which the brake mechanism is arranged, and a brake mechanism. It includes an operating member to be operated. The housing has an opening that communicates the first space and the second space, and a through hole that communicates the second space and the outside of the housing. The operating member is arranged so as to straddle the second space and the outside of the housing through the through hole. The operating member is movable between a brake position that operates the brake mechanism so as not to hinder the rotation of the saw chain and a drive position that operates the brake mechanism so as not to hinder the rotation of the saw chain. The brake mechanism includes a connecting member that moves in the second space in conjunction with the movement of the operating member.

In the above configuration, since the first space in which the prime mover is arranged and the second space in which the brake mechanism is arranged are communicated with each other by an opening, when the connecting member of the brake mechanism moves in the second space, the first space is used. The debris existing in the two spaces is discharged from the second space to the first space through the opening. Therefore, it is possible to prevent dust from accumulating in the second space and hindering the operation of the brake mechanism.

It is a perspective view which looked at the chainsaw of an Example from the left rear. It is a vertical sectional view of the chainsaw of an Example. It is a vertical cross-sectional view in a state where the chainsaw is placed on the mounting surface so that the oil supply part of the oil tank of the chainsaw of the embodiment faces upward. It is a perspective view of the oil tank of the chainsaw of an Example. It is a figure which shows the positional relationship between the inner wall of the chainsaw of an Example, and a communication hole. It is a perspective view which looked at the chainsaw of an Example from the right front. FIG. 5 is a right side view of the chainsaw in a state where the sprocket cover, the guide bar, and the brake cover of the chainsaw of the embodiment are removed and the operating member is located at the drive position. The right side view of the chainsaw in the state where the sprocket cover, the guide bar, and the brake cover of the chainsaw of the embodiment are removed and the operating member is located at the brake position is shown. It is a figure which shows the positional relationship between a switch member and a plate member when the operation member of the chainsaw of an Example is in a drive position. It is a figure which shows the positional relationship between a switch member and a plate member when the operation member of the chainsaw of an Example is in a brake position. It is a figure which shows the positional relationship between the outer guide plate, the guide bar, and the inner guide plate of the chainsaw of an Example. It is a perspective view of the inner guide plate of the chainsaw of an Example. It is a perspective view of the outer guide plate of the chainsaw of an Example.

In one or more embodiments, the chainsaw comprises a motor that rotates the saw chain, an oil tank that stores oil supplied to the saw chain, and a housing that has a first space in which the motor and oil tank are located. , May be provided. The housing may have a through hole that communicates the first space with the outside of the housing. The oil tank has an oil tank body that stores oil inside, an oil supply unit that is inserted through a through hole and is exposed to the outside of the housing and is used to supply oil to the inside of the oil tank body, and a deterrent structure. You may prepare. The restraint structure may be arranged on the motor side of the oil supply unit, and when the chainsaw is placed on the mounting surface so that the oil supply unit faces upward in the vertical direction, the oil tank faces upward in the vertical direction. The oil on the first outer surface of the main body may be suppressed from flowing to the motor side.

In the above configuration, when oil spills out of the refueling section toward the motor side, the restraint structure prevents the spilled oil from flowing toward the motor side. Therefore, it is possible to suppress the flow of oil to the outer surface of the oil tank located in the housing and on the motor side.

In one or more embodiments, the first outer surface of the oil tank body is in the vertical direction away from the motor when the chainsaw is placed on the mounting surface so that the refueling section faces upward in the vertical direction. It may be inclined downward.

In the above configuration, when the oil spills out of the refueling section, the oil flows on the first outer surface of the oil tank body and on the first outer surface of the oil tank body in the direction away from the motor. Therefore, it is possible to suppress the flow of oil to the outer surface of the oil tank located in the housing and on the motor side.

In one or more embodiments, the oil tank may include a guide structure. The guide structure may be connected to a restraint structure, and when the chainsaw is placed on the mounting surface so that the refueling unit faces upward in the vertical direction, the oil may be guided in a direction away from the motor. ..

In the above configuration, the oil spilled out of the refueling section and dammed by the restraint structure is guided by the guide structure and flows in the direction away from the motor. As a result, it is possible to suppress the flow of oil to the outer surface of the oil tank located in the housing and on the motor side.

In one or more embodiments, the first space side surface of the housing may be formed with a receiving portion for receiving oil dripping from the oil tank. The receiving portion may be located below the vertical direction of the oil tank when the chainsaw is in the working position, even if it overlaps at least partially with the oil tank when the chainsaw is viewed from above in the vertical direction. Good.

When the chainsaw is in working position, the oil travels vertically downward along the outer surface of the oil tank. After that, the oil drips from the oil tank. In the above configuration, the oil drips on the receiving portion formed on the surface of the housing on the first space side. Therefore, it is possible to prevent the oil from dripping out of the receiving portion.

In one or more embodiments, the housing may be formed with a communication hole that communicates the first space with the outside of the housing. The communication hole may be formed in the receiving portion.

In the above configuration, when the chainsaw is in the working position, the oil in the receiving portion is discharged to the outside of the housing through the communication hole. Therefore, it is possible to prevent oil from accumulating inside the housing.

In one or more embodiments, the first space may include an air flow path through which air that cools the motor flows. The oil tank may define a part of the air flow path.

In the above configuration, air flows along the outer surface of the oil tank. Even if dust adheres to the outer surface of the oil tank, the dust can be removed from the outer surface of the oil tank by air.

In one or more embodiments, the chainsaw comprises a prime mover that rotates the saw chain, a brake mechanism that stops the rotation of the saw chain, a first space in which the prime mover is located, and a second space in which the brake mechanism is located. A housing having an internal structure and an operating member for operating the brake mechanism may be provided. The housing may have an opening that communicates the first space and the second space, and a through hole that communicates the second space and the outside of the housing. The operating member may be arranged so as to straddle the second space and the outside of the housing through the through hole. The operating member may be movable between a brake position that operates the brake mechanism so as not to hinder the rotation of the saw chain and a drive position that operates the brake mechanism so as not to hinder the rotation of the saw chain. The brake mechanism may include a connecting member that moves in the second space in conjunction with the movement of the operating member.

In the above configuration, since the first space in which the prime mover is arranged and the second space in which the brake mechanism is arranged are communicated with each other by an opening, when the connecting member of the brake mechanism moves in the second space, the first space is used. The debris existing in the two spaces is discharged from the second space to the first space through the opening. Therefore, it is possible to prevent dust from accumulating in the second space and hindering the operation of the brake mechanism.

In one or more embodiments, when the chainsaw is in working position, the openings may be located below the connecting member in the vertical direction.

In the above configuration, when the chainsaw is in the working position, the debris existing in the second space is accumulated in the vicinity of the opening by gravity. Therefore, when the connecting member moves in the second space, the debris in the second space can be easily discharged from the second space to the first space through the opening.

In one or more embodiments, the connecting member exerts a compressive force on the joint member and the joint member, which are in a linear state when the operating member is in the drive position and in a flexed state when the operating member is in the braking position. An urging member to act on may be provided.

In the above configuration, when the operating member is in the driving position and the joint member is in the linear state, the joint member is maintained in the linear state even if a compressive force is applied from the urging member. However, when an impact acts on the chainsaw due to kickback during cutting work, the joint member is slightly bent, and the compressive force acting from the urging member switches the joint member from the linear state to the bent state. With the above configuration, when a kickback occurs, the brake mechanism can be automatically operated, and the safety of the operator can be improved.

In one or more embodiments, the chainsaw may further include a shaft that transmits the rotation of the prime mover to the saw chain, and a brake drum fixed to the shaft. The brake mechanism is arranged so as to surround the brake drum. When the operating member moves from the drive position to the brake position, the diameter is reduced to hinder the rotation of the brake drum, and when the operating member moves from the brake position to the drive position, the brake mechanism expands. A band shoe having a diameter that does not hinder the rotation of the brake drum may be further provided.

In the above configuration, the brake mechanism can be realized by a simple configuration.

(Example)
The chainsaw 2 of the embodiment will be described with reference to FIGS. 1 to 13. As shown in FIG. 1, the chainsaw 2 includes a housing 4, a guide bar 6, and a saw chain 8. The guide bar 6 is an elongated plate-shaped member. The guide bar 6 is attached to the housing 4 so as to project forward from the housing 4. The saw chain 8 is an annular chain in which a plurality of cutters are connected to each other. The saw chain 8 is attached along the peripheral edge of the guide bar 6. A battery 10 is attached to the housing 4. The chainsaw 2 cuts an object to be cut such as wood by rotating the saw chain 8 along the peripheral edge of the guide bar 6 by the electric power supplied from the battery 10. In the following, when the chainsaw 2 is mounted on a mounting surface P (see FIG. 2) such as the ground, the direction perpendicular to the mounting surface P (vertical direction) is referred to as the vertical direction, and the guide bar is mounted on the mounting surface P. The direction in which the longitudinal direction of 6 is projected is called the front-back direction, and the direction orthogonal to the up-down direction and the front-back direction is called the left-right direction. In addition, in order to make the drawing easier to see, the saw chain 8 is not shown in the drawings other than FIG.

The housing 4 includes a housing body 12. The battery 10 is attached to the lower rear portion of the housing body 12. Further, on the upper surface of the housing main body 12, a power switch 22 and a power lamp 24 for an operator to switch between an on state and an off state of the power supply of the chainsaw 2 are arranged. When the power lamp 24 is lit, the power of the chainsaw 2 is on, and when the power lamp 24 is off, the power of the chainsaw 2 is off.

The chainsaw 2 is a top handle chainsaw. The housing body 12 has a top handle 14a on the upper part of the housing body 12 for an operator to hold by hand. The top handle 14a is arranged behind the power switch 22 and the power lamp 24. The cross section of the top handle 14a has a substantially circular shape. A trigger switch 26 is arranged on the lower surface of the top handle 14a. When the trigger switch 26 is pushed up by the operator, the saw chain 8 rotates along the peripheral edge of the guide bar 6.

A trigger lock lever 28 is arranged on the upper surface of the top handle 14a. When the trigger lock lever 28 is pushed up, the operator cannot operate the trigger switch 26. On the other hand, when the trigger lock lever 28 is pushed down, the operator can operate the trigger switch 26.

The side handle 14b is a member for the operator to grasp by hand. The side handle 14b connects between the left side surface of the upper front part of the housing body 12 and the left side surface of the lower part of the front part. When using the chainsaw 2, the operator holds the chainsaw 2 by grasping the top handle 14a with his right hand and the side handle 14b with his left hand.

As shown in FIG. 2, the housing body 12 has an intake hole 16 on the rear surface of the housing body 12. The intake hole 16 penetrates the housing body 12 in the thickness direction. The intake hole 16 is a hole for sucking air from the outside to the inside of the housing body 12.

The housing body 12 has a recess 18 on the lower surface of the housing body 12. The recess 18 is recessed inward from the lower surface of the housing body 12. An exhaust hole 20 is arranged inside the recess 18. The exhaust hole 20 penetrates the housing body 12 in the thickness direction. The exhaust hole 20 is a hole for exhausting air from the inside of the housing body 12 to the outside. Even if the chainsaw 2 is mounted on the mounting surface P in the working posture, the exhaust hole 20 is not blocked by the mounting surface P.

The housing body 12 has a first space 12a inside. As shown in FIG. 3, a motor 34 and an oil tank 60 are arranged in the first space 12a.

The motor 34 is a prime mover for rotating the saw chain 8. The motor 34 is an outer rotor type DC brushless motor. The motor 34 includes a stator 36, a rotor 40, a cooling fan 42, and a shaft 44. The stator 36 is a member in which a coil wire 38 is wound around a core. The stator 36 is fixed to the housing body 12.

A rotor 40 is arranged on the outside of the stator 36. When power is supplied from the battery 10 to the coil wire 38, the rotor 40 rotates around the stator 36.

A cooling fan 42 is connected to the rotor 40. When the rotor 40 rotates, the cooling fan 42 also rotates at the same time. As a result, the air outside the housing 4 enters the first space 12a from the intake hole 16 of the housing body 12, cools the stator 36, the rotor 40, and the shaft 44, and flows to the cooling fan 42. After that, the air is discharged to the outside of the housing 4 from the exhaust hole 20 of the housing body 12. It should be noted that FIGS. 2 and 3 show arrows indicating the direction of air flow. Hereinafter, the first space 12a in the first space 12a through which air flows by the rotation of the cooling fan 42 is referred to as an air flow path 12b.

The shaft 44 is arranged so as to penetrate the center of the stator 36 and the rotor 40. The shaft 44 has an elongated cylindrical shape. The shaft 44 is rotatably supported by the housing body 12 via bearings 46 and 48. The shaft 44 is connected to the cooling fan 42. When the cooling fan 42 rotates with the rotation of the rotor 40, the shaft 44 also rotates at the same time. The shaft 44 transmits the rotation of the motor 34 to the saw chain 8.

One end of the shaft 44 projects to the outside of the housing body 12. A sprocket 50 and a brake base 52 are fixed in the vicinity of one end of the shaft 44. The sprocket 50 and the brake base 52 are arranged closer to one end of the shaft 44 than the bearings 46 and 48. A brake drum 54 is fitted to the brake base 52.

The sprocket 50 is arranged outside the housing body 12. A saw chain 8 is bridged from the guide bar 6 to the sprocket 50. When the motor 34 is driven, the sprocket 50 rotates at the same time as the shaft 44 rotates. As a result, the saw chain 8 rotates along the peripheral edge of the guide bar 6.

An oil tank 60 is arranged in front of the motor 34. In the first space 12a, the oil tank 60 is located at the frontmost portion of the housing body 12. As shown in FIGS. 3 and 4, the oil tank 60 includes an oil tank main body 62, an oil supply unit 64, a restraint structure 66, and a guide structure 70. In FIGS. 3 and 4, the oil supply portion 64 of the oil tank 60 faces upward. In the following, a drawing will be described with the refueling unit 64 facing upward. Therefore, in the following, it should be noted that the vertical direction, the front-rear direction, and the horizontal direction are the directions when the refueling unit 64 is facing upward.

As shown in FIG. 3, one end of the oil tank body 62 is fixed to the housing body 12. A space is defined inside by the oil tank main body 62 and the housing main body 12. Oil is stored in this space. The oil tank body 62 can store oil in the internal space. Oil is supplied to the saw chain 8 by a refueling pump (not shown) that is driven in conjunction with the rotation of the motor 34. The oil reduces the frictional resistance between the saw chain 8 and the guide bar 6. As a result, wear of the saw chain 8 is suppressed. Further, the outer surface of the oil tank body 62 defines a part of the air flow path 12b. Air flows between the oil tank body 62 and the motor 34 along the outer surface of the oil tank body 62.

The refueling unit 64 is an opening for refueling the oil tank main body 62. As shown in FIG. 4, the oil supply unit 64 is arranged on the first outer surface 62a of the oil tank main body 62. The first outer surface 62a is the upper surface of the oil tank 60 when the chainsaw 2 is placed on the mounting surface P so that the refueling unit 64 faces upward. The first outer surface 62a is inclined downward toward a direction away from the motor 34 (that is, toward the front of the chainsaw 2).

As shown in FIG. 3, the refueling unit 64 is inserted into a through hole 76 formed in the housing body 12. As shown in FIG. 1, when the chainsaw 2 is in the working posture, the through hole 76 is located in front of the left side surface of the housing body 12. The through hole 76 penetrates the housing body 12 in the thickness direction. The through hole 76 communicates the first space 12a with the outside of the housing 4. Therefore, the refueling unit 64 is exposed to the outside of the housing body 12. A removable cap 64a is attached to the refueling unit 64.

As shown in FIG. 4, a restraining structure 66 is provided on the first outer surface 62a of the oil tank main body 62. The restraint structure 66 extends outward (that is, upward) from the first outer surface 62a of the oil tank main body 62. The restraint structure 66 extends along the outer circumference of the refueling unit 64. As a result, a groove 68 is formed between the refueling unit 64 and the restraint structure 66. The restraint structure 66 restrains the oil on the first outer surface 62a from flowing to the motor 34 side. As a result, the oil does not adhere to the outer surface of the oil tank body 62 on the motor 34 side, so that it is possible to suppress the accumulation of debris generated from the object to be cut in the air flow path 12b.

As shown in FIG. 3, when the oil tank 60 is arranged in the first space 12a, the restraint structure 66 extends from the inner surface (hereinafter, referred to as the inner surface) of the housing body 12 on the periphery of the through hole 76. It is placed around. The peripheral wall 78 is arranged between the refueling unit 64 and the restraint structure 66. The refueling unit 64, the peripheral wall 78, and the restraint structure 66 are arranged in this order in the direction approaching the motor 34. The peripheral wall 78 is arranged in the groove 68. The groove 68 receives the peripheral wall 78.

As shown in FIG. 4, a guide structure 70 is provided on the first outer surface 62a of the oil tank main body 62. The guide structure 70 extends outward (that is, upward) from the first outer surface 62a of the oil tank main body 62. The guide structure 70 is connected to the restraint structure 66. The guide structure 70 and the restraint structure 66 are integrally formed. The guide structure 70 guides the oil on the first outer surface 62a in a direction away from the motor 34. The guide structure 70 includes a first guide structure 72 and a second guide structure 74. The first guide structure 72 is arranged on the left side of the restraint structure 66 (below the restraint structure 66 when the chainsaw 2 is in the working posture), and the second guide structure 74 is on the right side of the restraint structure 66 (the chainsaw 2 is on the right side). When in the working posture, it is arranged above the restraint structure 66). The first guide structure 72 extends from the end connected to the restraint structure 66 toward the left side, and then curves and extends forward. The second guide structure 74 extends from the end connected to the restraint structure 66 toward the right side, and then curves and extends forward. Although not shown, when the oil tank 60 is arranged in the first space 12a, the first guide structure 72 and the second guide structure 74 are arranged around the peripheral wall 78 of the housing main body 12.

In the above, the description will be made using the drawing in which the refueling unit 64 is facing upward, but in the following, the drawing will be described in the state where the chainsaw 2 is in the working posture. Therefore, in the following, it should be noted that the vertical direction, the front-back direction, and the left-right direction are the directions when the chainsaw 2 is in the working posture. As shown in FIG. 2, an inner wall 80 is arranged below the oil tank 60. The inner wall 80 is provided on the inner surface of the housing body 12. The inner wall 80 extends from the inner surface of the housing body 12 toward the oil tank 60. The inner wall 80 extends in the left-right direction (vertical direction on the paper surface in FIG. 2). One end of the inner wall 80 reaches the inner surface on the left side of the housing body 12. The inner wall 80 is separated from the oil tank 60.

The inner wall 80 defines the receiving portion 82 in front of the inner wall 80. The receiving portion 82 is formed on the lower inner surface of the housing body 12. The receiving portion 82 is arranged between the front inner surface of the housing body 12 and the inner wall 80. The receiving portion 82 extends in the left-right direction (vertical direction on the paper surface in FIG. 2). The receiving portion 82 is arranged below the oil tank 60. When the chainsaw 2 in the working posture is viewed from above, the receiving portion 82 overlaps the oil tank 60. The receiving portion 82 receives the oil dripping from the oil tank 60.

As shown in FIG. 5, the housing main body 12 has a communication hole 84 on the front lower surface of the housing main body 12. The communication hole 84 penetrates the housing body 12 in the thickness direction. The communication hole 84 communicates the first space 12a with the outside of the housing 4. The communication hole 84 is formed in the receiving portion 82. The communication hole 84 is located at the end of the receiving portion 82 in the longitudinal direction.

As shown in FIG. 6, the housing 4 further includes a brake cover 90. In FIG. 6, the guide bar 6 is not shown. The brake cover 90 is fixed to the right side surface of the housing body 12. The brake cover 90 forms a second space 92 with the housing body 12. That is, the housing 4 has a second space 92. The brake cover 90 has a through hole 98 formed in front of the brake cover 90 with the housing body 12. That is, the housing 4 has a through hole 98. The through hole 98 communicates the second space 92 with the outside of the housing 4.

Further, the brake cover 90 covers the opening 94 (see FIGS. 7 and 8) formed in the housing body 12 and the guide wall 96 (see FIGS. 7 and 8) provided in the housing body 12. There is.

As shown in FIGS. 7 and 8, the opening 94 and the guide wall 96 are arranged in front of the right side surface of the housing body 12. The opening 94 penetrates the housing body 12 in the thickness direction. The opening 94 communicates the air flow path 12b (that is, the first space 12a) with the second space 92.

The guide wall 96 is integrally formed with the housing body 12. The guide wall 96 projects from the right side surface of the housing body 12. The guide wall 96 extends along the peripheral edge of the lower end of the opening 94. The guide wall 96 is connected to the right side surface of the housing body 12 at the base end of the guide wall 96, and extends upward as it is separated from the right side surface of the housing body 12. That is, the guide wall 96 is inclined upward from the base end to the tip end of the guide wall 96. The guide wall 96 does not cover the periphery of the upper end of the opening 94.

The chainsaw 2 further includes an operating member 100 and a brake mechanism 104. A part of the operating member 100 and the brake mechanism 104 are arranged in the second space 92.

The operating member 100 is inserted through the through hole 98. The operating member 100 is arranged so as to straddle the second space 92 and the outside of the housing 4. The cross section of the operating member 100 at the portion inserted through the through hole 98 is smaller than the cross section of the through hole 98. Therefore, even if the operating member 100 is inserted through the through hole 98, the second space 92 and the outside of the housing 4 communicate with each other through the through hole 98. The end of the operating member 100 arranged on the second space 92 side is rotatably supported by the housing body 12. The operating member 100 moves between the drive position and the brake position. When the operating member 100 at the driving position is pushed down toward the front, the operating member 100 moves from the driving position to the braking position. On the other hand, when the operating member 100 at the brake position is raised backward, the operating member 100 moves from the brake position to the driving position.

The brake mechanism 104 is operated by the operating member 100 to stop the rotation of the saw chain 8. The brake mechanism 104 includes an urging member 102, a protrusion member 103, a connecting member 105, and a band shoe 114. The urging member 102 is a coil spring. As shown in FIG. 7, when the operating member 100 is in the driving position, the urging member 102 puts the protrusion member 103 in the groove portion 100a located near the end portion of the operating member 100 on the second space 92 side. I'm pushing. Therefore, even if a force for tilting the operating member 100 forward acts on the operating member 100, if the force is smaller than a predetermined value, the operating member 100 is maintained at the driving position. On the other hand, when the force is larger than a predetermined value, the operating member 100 moves from the driving position to the braking position.

Along with the urging member 102 and the protrusion member 103, the connecting member 105 is arranged in the second space 92. The connecting member 105 includes a joint member 106, an intermediate member 108, and an urging member 110. One end of the joint member 106 is fixed to the operating member 100. An opening 94 and a guide wall 96 are arranged below the joint member 106. The joint member 106 switches between a linear state and a bent state. The joint member 106 moves in conjunction with the movement of the operating member 100. As shown in FIG. 7, when the operating member 100 is in the driving position, the joint member 106 is in a linear state. In the linear state, the joint member 106 extends linearly. As shown in FIG. 8, when the operating member 100 is in the brake position, the joint member 106 is in a bent state. In the flexed state, the joint member 106 is flexed upward. When the joint member 106 moves between the linear state and the bent state, the debris existing in the second space 92 moves to the air flow path 12b (that is, the first space 12a) through the opening 94. After that, the dust is discharged from the exhaust hole 20 to the outside of the housing 4 by the air flowing through the air flow path 12b.

An intermediate member 108 is rotatably connected to the other end of the joint member 106. As shown in FIG. 7, when the joint member 106 is in a linear state, the intermediate member 108 is located at the rear position. On the other hand, as shown in FIG. 8, when the joint member 106 is in the bent state, the intermediate member 108 is located at the front position. A part of the intermediate member 108 is inserted inside the urging member 110.

The urging member 110 is a coil spring. The urging member 110 urges the intermediate member 108 forward with respect to the housing body 12. As shown in FIG. 7, when the operating member 100 is in the driving position and the joint member 106 is in a linear state, the joint member 106 is in a linear state even if the compressive force of the urging member 110 acts on the intermediate member 108. Be maintained. However, when an impact acts on the chainsaw 2 due to kickback during cutting work, the joint member 106 is slightly bent, and the compressive force of the urging member 110 switches the joint member 106 from the linear state to the bent state, and also operates. The member 100 moves from the drive position to the brake position (see FIG. 8).

A band shoe 114 is connected to the intermediate member 108. The band shoe 114 is arranged so as to surround the brake drum 54. The other end of the band shoe 114 is fixed to the housing body 12. As shown in FIG. 8, when the operating member 100 moves from the drive position to the brake position, the intermediate member 108 moves to the front position, the band shoe 114 is reduced in diameter, and comes into contact with the outer peripheral surface of the brake drum 54. The frictional force acting between the band shoe 114 and the brake drum 54 hinders the rotation of the brake drum 54. That is, the rotation of the sprocket 50 is hindered. As a result, the rotation of the saw chain 8 is stopped. On the other hand, as shown in FIG. 7, when the operating member 100 moves from the brake position to the drive position, the intermediate member 108 moves to the rear position, the band shoe 114 expands in diameter, and is separated from the outer peripheral surface of the brake drum 54. .. In this case, the rotation of the brake drum 54 is not hindered. That is, the rotation of the sprocket 50 is not hindered. Therefore, the saw chain 8 rotates.

As shown in FIGS. 9 and 10, the chainsaw 2 further includes a switch member 120 and a plate member 124. 9 and 10 are views of the front of the right side surface of the housing body 12 of the chainsaw 2 in the working posture as viewed from the first space 12a side. As shown in FIG. 9, the switch member 120 and the plate member 124 are arranged in the first space 12a of the housing main body 12. Although not shown, the switch member 120 and the plate member 124 are arranged on opposite sides of the brake mechanism 104 with the right side surface of the housing body 12 interposed therebetween. The switch member 120 has a switch 122. With the switch 122 pressed, it is permissible to supply current to the motor 34. Therefore, when the trigger switch 26 (see FIG. 1) is pressed, the motor 34 is driven and the saw chain 8 is rotated. When the switch 122 is not pressed, the supply of current to the motor 34 is prohibited. Therefore, even if the trigger switch 26 (see FIG. 1) is pressed, the motor 34 does not drive and the saw chain 8 does not rotate.

The plate member 124 includes a straight portion 126 and a curved portion 128. The straight portion 126 extends linearly. The curved portion 128 is curved in a semicircular shape.

The chainsaw 2 further includes a pressing member 132. The pressing member 132 is integrally formed with the operating member 100. The pressing member 132 is inserted into an insertion hole 134 formed on the right side surface of the housing main body 12 and extends to the first space 12a. The insertion hole 134 is closed by the operating member 100 on the second space 92 side. When the operating member 100 moves, the pressing member 132 moves in conjunction with it. As shown in FIG. 9, when the operating member 100 is in the drive position, the pressing member 132 abuts on the curved portion 128 and presses the straight portion 126 toward the switch member 120. In this state, the switch 122 is pressed. As shown in FIG. 10, when the operating member 100 is in the brake position, the pressing member 132 is separated without abutting on the plate member 124. In this state, the straight line portion 126 is separated from the switch 122. That is, the switch 122 is not pressed.

As shown in FIG. 11, the housing 4 further includes an inner plate 136, an outer plate 142, and a sprocket cover 150. The inner plate 136 and the outer plate 142 are fixed to the right side surface of the housing body 12 with the guide bar 6 sandwiched between them.

As shown in FIG. 12, the inner plate 136 includes a first flat surface portion 138, a first bent portion 139a and 139b, a second flat surface portion 140a and 140b, and a second bent portion 141a and 141b. The first flat surface portion 138 extends in the vertical direction. Each of the first bent portions 139a and 139b is connected to each of the vertical ends of the first flat portion 138 and is bent toward the left side. Each of the second plane portions 140a and 140b is connected to each of the first bent portions 139a and 139b and extends in the vertical direction. The second bent portion 141a is connected to the upper end portion of the second flat surface portion 140a and is bent toward the upper left side. The second bent portion 141b is connected to the lower end portion of the second flat portion 140b and is bent toward the lower left side.

As shown in FIG. 13, the outer plate 142 includes a first flat surface portion 144, a first bent portion 145a and 145b, a second flat surface portion 146a and 146b, and a second bent portion 147a and 147b. The first plane portion 144 extends in the vertical direction. Each of the first bent portions 145a and 145b is connected to each of the vertical end portions of the first plane portion 144 and is bent toward the right side. Each of the second plane portions 146a and 146b is connected to each of the first bent portions 145a and 145b and extends in the vertical direction. The second bent portion 147a is connected to the upper end portion of the second flat surface portion 146a and is bent toward the upper right side. The second bent portion 147b is connected to the lower end portion of the second flat surface portion 146b and is bent toward the lower right side.

As shown in FIG. 11, the guide bar 6 is arranged between the first flat surface portion 138 of the inner plate 136 and the first flat surface portion 144 of the outer plate 142. The width between the first flat surface portion 138 of the inner plate 136 and the first flat surface portion 144 of the outer plate 142 is equal to the width in the thickness direction of the guide bar 6. The width between the second plane portion 140a of the inner plate 136 and the second plane portion 146a of the outer plate 142 is the width between the second plane portion 140b of the inner plate 136 and the second plane portion 146b of the outer plate 142. Is greater than the width between the first plane portion 138 of the inner plate 136 and the first plane portion 144 of the outer plate 142. When the saw chain 8 rotates, the saw chain 8 is placed between the second flat portion 140a of the inner plate 136 and the second flat portion 146a of the outer plate 142, and between the second flat portion 140b of the inner plate 136 and the outer plate 142. It passes between the two plane portions 146b. In FIG. 11, the passing region of the saw chain 8 is illustrated by a alternate long and short dash line. Debris adhering to the saw chain 8 when the object to be cut is cut using the chainsaw 2 is collected between the second flat surface portion 140a of the inner plate 136 and the second flat surface portion 146a of the outer plate 142 and on the inner plate 136. It comes off from the saw chain 8 between the second flat surface portion 140b and the second flat surface portion 146b of the outer plate 142.

The sprocket 50, the inner plate 136, and the outer plate 142 are covered by the sprocket cover 150. The sprocket cover 150 is fixed to the right side surface of the housing body 12.

In the chainsaw 2 of this embodiment, oil is supplied to the oil tank 60 in a state where the chainsaw 2 is placed on the mounting surface P so that the oil supply portion 64 of the oil tank 60 faces upward. When refueling, oil may spill out of the refueling unit 64. In the chainsaw 2 of this embodiment, the motor 34 and the oil tank 60 are arranged in the first space 12a of the housing body 12 of the housing 4. The oil supply portion 64 of the oil tank 60 is inserted through the through hole 76 and is exposed to the outside of the housing body 12 of the housing 4. The restraint structure 66 of the oil tank 60 is arranged on the motor 34 side of the oil supply unit 64 when the chainsaw 2 is placed on the mounting surface P so that the oil supply unit 64 faces upward in the vertical direction, and is arranged in the vertical direction. The oil on the first outer surface 62a of the oil tank body 62 facing upward is suppressed from flowing to the motor 34 side. In the above configuration, when the oil spills out of the refueling unit 64 toward the motor 34 side, the restraint structure 66 suppresses the oil from flowing toward the motor 34 side. Therefore, it is possible to prevent the oil from flowing to the outer surface of the oil tank main body 62 located on the motor 34 side in the first space 12a.

Further, when the chainsaw 2 is placed on the mounting surface P so that the refueling unit 64 faces upward in the vertical direction, the first outer surface 62a is inclined downward in the vertical direction toward the direction away from the motor 34. .. In the above configuration, when oil spills out of the refueling unit 64, the oil flows on the first outer surface 62a in a direction away from the motor 34. Therefore, it is possible to prevent the oil from flowing to the outer surface of the oil tank main body 62 located on the motor 34 side in the first space 12a.

Further, the guide structure 70 is connected to the restraint structure 66. The guide structure 70 guides the oil in a direction away from the motor 34. In the above configuration, the oil dammed by the restraint structure 66 is guided by the guide structure 70 and flows in a direction away from the motor 34. Therefore, it is possible to prevent the oil from flowing to the outer surface of the oil tank main body 62 located in the first space 12a and located on the motor 34 side.

Further, when the chainsaw 2 is in the working posture, the oil spilled to the outside of the refueling unit 64 flows downward along the outer surface of the oil tank body 62 in the vertical direction. After that, the oil drips from the oil tank body 62. In the chainsaw 2 of the present embodiment, when the chainsaw 2 is in the working posture, the receiving portion 82 is arranged below the oil tank 60 in the vertical direction, and the oil when the chainsaw 2 is viewed from above in the vertical direction. It overlaps tank 60 at least partially. In the above configuration, the oil drips from the oil tank 60 toward the receiving portion 82. Therefore, it is possible to prevent the oil from dripping to the outside of the receiving portion 82.

Further, the communication hole 84 communicates the first space 12a with the outside of the housing body 12 of the housing 4. The communication hole 84 is formed in the receiving portion 82. In the above configuration, when the chainsaw 2 is in the working posture, the oil dripping on the receiving portion 82 passes through the communication hole 84 and is discharged to the outside of the housing body 12. Therefore, it is possible to prevent the oil from accumulating in the first space 12a.

Further, the oil tank main body 62 defines a part of the air flow path 12b. Air flows between the oil tank body 62 and the motor 34 along the outer surface of the oil tank body 62. In the above configuration, even if dust adheres to the outer surface of the oil tank main body 62, the dust can be removed from the outer surface of the oil tank main body 62 by the air flowing along the outer surface of the oil tank main body 62.

Further, when the oil tank 60 is arranged in the first space 12a, the restraint structure 66 is in contact with the peripheral wall 78 extending along the peripheral edge of the through hole 76 of the housing body 12. The peripheral wall 78 is arranged between the grooves 68 formed between the refueling unit 64 and the restraint structure 66. In the above configuration, when the oil is vigorously spilled out of the refueling unit 64 while the oil is being refueled to the oil tank 60, the peripheral wall 78 suppresses the momentum of the oil flow. Therefore, as compared with the case where the chainsaw 2 does not include the peripheral wall 78, it is possible to prevent the oil from flowing over the restraining structure 66 and flowing to the motor 34 side.

Further, during the cutting operation of cutting the object to be cut using the chainsaw 2 of the present embodiment, the debris of the object to be cut may enter the second space 92 through the through hole 98 and accumulate. .. In the chainsaw 2 of this embodiment, the operating member 100 and the brake mechanism 104 are arranged in the second space 92. The operating member 100 moves between the brake position and the drive position. The joint member 106 of the connecting member 105 of the brake mechanism 104 moves in the second space 92 in conjunction with the operating member 100. The opening 94 of the housing body 12 of the housing 4 communicates the first space 12a and the second space 92. In the above configuration, the joint member 106 moves in conjunction with the operating member 100, so that the debris existing in the second space 92 is pushed and moved. The debris is discharged from the second space 92 to the first space 12a through the opening 94. Therefore, it is possible to prevent dust from accumulating in the second space 92 and hindering the operation of the brake mechanism 104.

Further, when the chainsaw 2 is in the working posture, the opening 94 is arranged below the brake mechanism 104 in the vertical direction. In the above configuration, when the chainsaw 2 is in the working posture, the debris existing in the second space 92 is accumulated in the vicinity of the opening 94 by gravity. Therefore, when the joint member 106 moves, the dust can be easily discharged from the second space 92 to the first space 12a through the opening 94.

Further, the joint member 106 is in a linear state when the operating member 100 is in the driving position, and is in a bent state when the operating member 100 is in the braking position. The urging member 110 exerts a compressive force on the joint member 106 by urging the intermediate member 108 forward. In the above configuration, when the joint member 106 is in the linear state, the joint member 106 is maintained in the linear state even if the compressive force of the urging member 110 acts on the intermediate member 108. However, when an impact acts on the chainsaw 2 due to kickback during cutting work, the joint member 106 is slightly bent, and the compressive force acting from the urging member 110 switches the joint member 106 from the linear state to the bent state. .. With the above configuration, the brake mechanism 104 can be automatically operated when kickback occurs. Therefore, the safety of the operator can be improved.

Further, the band shoe 114 is arranged so as to surround the brake drum 54. When the operating member 100 moves from the drive position to the brake position, the intermediate member 108 moves to the front position, the band shoe 114 has a reduced diameter, and comes into contact with the outer peripheral surface of the brake drum 54. As a result, the 54 rotations of the brake drum are hindered. On the other hand, when the operating member 100 moves from the brake position to the drive position, the intermediate member 108 moves to the rear position, the band shoe 114 expands in diameter, and is separated from the outer peripheral surface of the brake drum 54. As a result, the rotation of the brake drum 54 is not hindered. In the above configuration, the brake mechanism 104 can be realized by the simple structure of the band shoe 114.

Further, when the chainsaw 2 is in the working posture, the guide wall 96 extends along the peripheral edge of the lower end of the opening 94. The guide wall 96 projects from the left side surface of the housing body 12. In the above configuration, the debris that has moved to the opening 94 due to the movement of the connecting member 105 is guided by the guide wall 96 and moves to the opening 94 along the guide wall 96. Therefore, the waste can be efficiently moved to the opening 94.

Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above.

The chainsaw 2 according to the embodiment may include an engine instead of the motor 34 as a prime mover for rotating the sprocket 50. In this case, the shaft 44 connected to the sprocket 50 may be rotated by driving the engine.

The chainsaw 2 according to the embodiment may be a rear handle chainsaw.

In the chainsaw 2 according to the embodiment, the opening 94 may be located on an extension line of the joint member 106 in the bending direction.

In the chainsaw 2 according to the embodiment, when the operating member 100 moves between the drive position and the brake position, the joint member 106 may move in a straight line without bending.

In the chainsaw 2 according to the embodiment, the restraint structure 66 may be a groove recessed inward from the first outer surface 62a of the oil tank body 62.

In the chainsaw 2 according to the embodiment, the oil tank main body 62 may have a configuration in which a space for storing oil is defined only by the oil tank main body 62.

The chainsaw 2 according to the embodiment does not have to include the switch member 120.

The technical elements described herein or in the drawings exhibit their technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques illustrated in the present specification or drawings can achieve a plurality of purposes at the same time, and achieving one of the purposes itself has technical usefulness.

2: Chainsaw 4: Housing 6: Guide bar 8: Saw chain 12: Housing body 12a: First space 12b: Air flow path 16: Intake hole 18: Recess 20: Exhaust hole 34: Motor 36: Stator 40: Rotor 42: Cooling fan 44: Shaft 50: Sprocket 54: Brake drum 60: Oil tank 62: Oil tank body 62a: First outer surface 64: Refueling part 66: Suppression structure 70: Guide structure 78: Circumferential wall 80: Inner wall 82: Receiving part 84: Communication hole 90: Brake cover 92: Second space 94: Opening 96: Guide wall 98: Through hole 100: Operating member 100a: Groove 102, 110: Brake member 103: Protruding member 104: Brake mechanism 105: Connecting member 106: Joint member 108: Intermediate member 114: Band shoe 120: Switch member 124: Plate member 132: Pushing member 134: Insertion hole 136: Inner plate 142: Outer plate P: Mounting surface

Claims (4)

It ’s a chainsaw,
The prime mover that rotates the saw chain,
A brake mechanism that stops the rotation of the saw chain and
A housing having a first space in which the prime mover is arranged and a second space in which the brake mechanism is arranged,
An operating member for operating the brake mechanism is provided.
The housing has an opening that communicates the first space and the second space, and a through hole that communicates the second space and the outside of the housing.
The operating member is arranged so as to straddle the second space and the outside of the housing through the through hole.
The operating member is movable between a brake position that operates the brake mechanism so as not to hinder the rotation of the saw chain and a drive position that operates the brake mechanism so as not to hinder the rotation of the saw chain. hand,
The brake mechanism is a chainsaw including a connecting member that moves in the second space in conjunction with the movement of the operating member. The chainsaw according to claim 1, wherein when the chainsaw is in the working posture, the opening is arranged below the connecting member in the vertical direction. The connecting member
A joint member that is in a linear state when the operating member is in the driving position and is in a bent state when the operating member is in the braking position.
The chainsaw according to claim 1 or 2, further comprising an urging member that exerts a compressive force on the joint member. A shaft that transmits the rotation of the prime mover to the saw chain,
Further equipped with a brake drum fixed to the shaft,
The brake mechanism is arranged so as to surround the brake drum, and when the operating member moves from the driving position to the braking position, the diameter is reduced to hinder the rotation of the brake drum, and the operating member causes the operating member. The chainsaw according to any one of claims 1 to 3, further comprising a band shoe that expands in diameter when moving from the brake position to the drive position and does not hinder the rotation of the brake drum.

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