Work equipment

Abstract

The present invention improves workability. A cutting work machine 10 has a discharge passage 80 disposed at an outer peripheral portion of a saw cover 22. The discharge passage 80 is formed in a recess shape that has formed therein a discharge port 81 opened towards the left side. Formed at a front end of the discharge passage 80 is a discharge / inlet port 83. By way of the discharge / inlet port 83, the saw cover 22 and the discharge passage 80 are connected to each other. Further, a side guide surface 84 that constitutes the right lateral surface of the discharge passage 80 is, when viewed from above, inclined more to the left side at a location closer to the rear side. Here, the rear surface of the discharge passage 80 is formed with a rear guide surface 87, and the rear guide surface 87 is inclined more to the back side at a location closer to the left side. This configuration causes cutting chips flowing towards the rear-end side of the discharge passage 80 along the side guide surface 84 to hit the rear guide surface 87 and changes the discharge direction of the cutting chips to the left side (to the discharge-port 81 side). Accordingly, since the cutting chips are discharged approximately leftward from the discharge port 81, it is possible to improve workability of the cutting work machine 10. 1

Description

[Technical field]

[0001] The present invention relates to a work machine. [Background technology]

[0002] The portable cutting machine (working machine) described in Patent Document 1 below has a saw blade and a saw cover that covers the upper part of the saw blade. A link cover having a chip discharge port is attached to the saw cover. As a result, when cutting is performed by the portable cutting machine, chips flowing backward inside the saw cover are discharged from the chip discharge port. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-069588 A Summary of the Invention [Problem to be solved by the invention]

[0004] Here, as described above, when cutting is performed by the portable cutting machine, the chips flowing backward in the saw cover are discharged from the chip discharge port. Therefore, the chips discharged from the chip discharge port may be blown out to the worker positioned behind the portable cutting machine. At this time, there is a risk that the chips discharged from the chip discharge port may reduce workability. In addition, as another problem, by configuring the working machine to be able to be suspended from a vertical member such as wood, the working machine can be temporarily stored in a suspended state when not in use, for example, when the processing work is temporarily suspended. However, if the suspended state is unstable, the attitude of the working machine may be changed by vibration or wind, and the worker may be suspended in an unintended position or manner. In this case, it is necessary to correct the attitude, which may reduce workability. In addition, in recent years, there are more and more cases in which brushless motors are used in working machines, but in this case, a control circuit for controlling the brushless motor is required, and a housing for the same is also required, so that the installation of the control circuit may increase the size of the working machine and reduce workability.

[0005] SUMMARY OF THE PRESENT EMBODIMENT In consideration of the above, an object of the present invention is to provide a work machine capable of improving workability. [Means for solving the problem]

[0006] One or more embodiments of the present invention include It extends left and right, An output shaft driven by the power of a prime mover, The left and right a circular saw blade held at one end in a direction of the cutting edge; Upper part of a saw cover that covers the circular saw blade, the saw cover being provided with a saw blade and disposed radially outward of the circular saw blade; left and right a discharge passage having a discharge port open to one side in a direction of a cutting direction and discharging, from the discharge port, a cut piece flowing rearward inside the saw cover during cutting, The discharge passage has a lower guide surface that forms a lower surface of the discharge passage and is inclined downward toward one side in the left-right direction when viewed from the front-rear direction, and the lower guide surface is configured to include an upper lower guide surface that forms an upper part of the lower guide surface and a lower lower guide surface that forms a lower part of the lower guide surface, and the inclination angle of the upper lower guide surface with respect to the vertical direction is set to be smaller than the inclination angle of the lower lower guide surface with respect to the vertical direction. It is a work machine.

[0007] Books In one or more embodiments of the invention, the exhaust passage comprises: left and rightThe side surface on the other side of the direction is formed, and as viewed from above, the left and right a side guide surface inclined toward one side of the discharge path, and a rear end of the side guide surface is connected to the side guide surface, and the direction of the workpiece flowing rearward along the side guide surface is controlled by the side guide surface. left and right A rear guide surface that changes the direction of the do It is a work machine.

[0008] One or more embodiments of the present invention include The inclination angle of the rear guide surface with respect to the front-rear direction is larger than that of the side guide surface. It is a work machine.

[0009] One or more embodiments of the present invention are Upper lower guide surface In one or more embodiments of the present invention, Lower guide surface In one or more embodiments of the present invention, Upper lower guide surface and the above Lower guide surface Both of these are flat work machines.

[0010] One or more embodiments of the present invention include the saw cover covering the circular saw blade; and a discharge passage provided in the saw cover, disposed radially outward of the circular saw blade, having a discharge port open to one side in the axial direction, and discharging workpieces flowing rearward inside the saw cover from the discharge port during machining, the discharge passage having an inlet portion formed at a front end of the discharge passage and communicating between an interior of the saw cover and an interior of the discharge passage; a side guide surface forming a side surface on the other side in the axial direction of the discharge passage and inclined to one side in the axial direction as it approaches the rear side when viewed from above; a rear guide surface connected to a rear end of the side guide surface and changing the direction of the processed chip flowing rearward along the side guide surface to one side in the axial direction; and a lower guide surface constituting a lower surface of the discharge path, disposed adjacent to the side guide surface and the rear guide surface, and inclined downwardly toward one side in the axial direction when viewed from the front-rear direction, the lower guide surface including an upper lower guide surface constituting an upper portion of the lower guide surface and a lower lower guide surface constituting a lower portion of the lower guide surface, and an inclination angle of the upper lower guide surface with respect to the vertical direction is set smaller than an inclination angle of the lower lower guide surface with respect to the vertical direction. It is a work machine.

[0011] One or more embodiments of the present invention include The rear guide surface is inclined rearward as it approaches one side in the axial direction when viewed from above. It is a work machine. One or more embodiments of the present invention are a work machine in which the inclination angle of the rear guide surface relative to the front-to-rear direction when viewed from above is set to be larger than the inclination angle of the side guide surface relative to the front-to-rear direction.

[0012] One or more embodiments of the present invention are directed to a work machine in which the vertical width of the upper lower guide surface is set to increase toward the rear as viewed from one side in the axial direction. In one or more embodiments of the present invention, the discharge port is inclined downward toward the rear side when viewed from the axial direction.

[0015] One or more embodiments of the present invention are directed to a work machine in which an inclination angle of the side guide surface with respect to the front-rear direction is 10 degrees or more and 50 degrees or less.One or more embodiments of the present invention are directed to a work machine in which a difference in inclination angle between the side guide surface and the rear guide surface is less than 60 degrees. Effect of the Invention

[0020] According to one or more embodiments of the present invention, workability can be improved. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a side view showing the cutting machine according to the present embodiment as viewed from the right side. [Diagram 2] 2 is a side view of the cutting machine shown in FIG. 1 as viewed from the left side. [Diagram 3] 2 is a plan view of the cutting machine shown in FIG. 1 as viewed from above. FIG. [Figure 4] FIG. 2 is a partially exploded perspective view of the housing shown in FIG. 1. [Diagram 5] 2 is a side view showing the inside of the handle housing shown in FIG. 1 with the battery pack removed and the motor housing partially cut away. FIG. [Figure 6] 7 is a cross-sectional view showing the inside of the motor housing shown in FIG. 6 as viewed from the other side in the second direction (cross-sectional view taken along line 6-6 in FIG. 5). [Figure 7] 7 is a two-sided view of the motor housing shown in FIG. 6, as viewed from the left side and one side in the second direction. [Figure 8] 8 is a cross-sectional view (cross-sectional view taken along line 8-8 in FIG. 1) showing the inside of the motor unit shown in FIG. [Figure 9] 2 is a two-sided view of the battery pack shown in FIG. 1 as seen from the left side and one side in the second direction. [Figure 10] 3 is an enlarged side view of the discharge passage shown in FIG. 2. [Figure 11] 11 is a cross-sectional view showing the inside of the discharge passage shown in FIG. 10 with the saw cover partially cut away, as viewed from the diagonally front left side. [Figure 12] 10A is a cross-sectional view from above showing the upper part of the discharge passage shown in FIG. 10 (cross-sectional view taken along line 12A-12A in FIG. 10), and FIG. 10B is a cross-sectional view from above showing the connection between the side guide surface and the rear guide surface of the discharge passage shown in FIG. 10 (cross-sectional view taken along line 12B-12B in FIG. 10). [Figure 13]13 is a cross-sectional view showing the rear end portion of the discharge passage shown in FIG. 10 as viewed from the rear side (cross-sectional view taken along line 13-13 in FIG. 10). [Figure 14] 1. FIG. 4 is an explanatory diagram showing a connected state between a suspension arm and a support cylinder portion of a fixed member in the suspension mechanism shown in FIG. 1, viewed from one side in a second direction with the support cylinder portion cut away. [Figure 15] FIG. 2A is an explanatory diagram viewed from the right side to illustrate the state in which the cutting machine shown in FIG. 1 is suspended from a suspension support member, and FIG. 2B is an explanatory diagram viewed from above in the vertical direction of the cutting machine in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, a cutting machine 10 as a working machine according to this embodiment will be described with reference to the drawings. Note that the arrows UP, FR, and RH shown as appropriate in the drawings respectively indicate the upper side, front side, and right side of the cutting machine 10. In the following description, when the up-down, front-back, and left-right directions are used, they refer to the up-down, front-back, and left-right directions of the cutting machine 10 unless otherwise specified.

[0023] Also, when viewed from the left-right direction, the direction that slopes downward toward the front (the directions of arrows A and B in Figs. 1 and 2) is defined as the first direction, and the direction perpendicular to the first direction (the directions of arrows C and D in Figs. 1 and 2) is defined as the second direction. Furthermore, the side in the direction of arrow A in Figs. 1 and 2 is defined as one side of the first direction, the side in the direction of arrow B in Figs. 1 and 2 is defined as the other side of the first direction, the side in the direction of arrow C in Figs. 1 and 2 is defined as one side of the second direction, and the side in the direction of arrow D in Figs. 1 and 2 is defined as the other side of the second direction.

[0024] The cutting machine 10 is configured as a machine for cutting wood or other processed materials. As shown in Figs. 1 to 4, the cutting machine 10 includes a base 12, a housing 20, a motor unit 60, a controller 70 and a transmission mechanism 72 (see Fig. 8) housed in the housing 20, and a sub-handle 56 provided on the housing 20. The cutting machine 10 also includes a battery pack 54 for supplying power to the brushless motor 61 of the motor unit 60 and the controller 70. The cutting machine 10 also includes a suspension mechanism 90, and when the cutting machine 10 is not in use, the suspension mechanism 90 is used to suspend the cutting machine 10 from a support member 100 for suspending wood or other materials extending vertically. Each component of the cutting machine 10 will be described below.

[0025] (Base 12) As shown in Figs. 1 to 3 and 8, the base 12 is formed in a substantially rectangular plate shape with the up-down direction as the plate thickness direction and the front-rear direction as the longitudinal direction. When cutting by the cutting machine 10, the base 12 is placed on the workpiece, and the lower surface of the base 12 is slid forward along the upper surface of the workpiece. A tool insertion portion 12A for accommodating a circular saw blade 14 as a tool is formed through the left part of the base 12, and the tool insertion portion 12A is formed in a substantially rectangular hole shape with the front-rear direction as the longitudinal direction in a plan view. Here, the circular saw blade 14 is formed in a substantially disc shape with the left-right direction as the plate thickness direction, and the center of the circular saw blade 14 is fixed to an output shaft 73 of a transmission mechanism 72 described later so as to be rotatable together with the blade (see Fig. 8). The circular saw blade 14 is disposed within the tool insertion portion 12A, with an upper portion of the circular saw blade 14 protruding upward from the base 12 and a lower end portion of the circular saw blade 14 protruding downward from the base 12.

[0026] 1 to 8, the housing 20 includes a saw cover 22 that covers the circular saw blade 14, and a handle housing 30 and a motor housing 40 that serve as a main body housing and are attached to the saw cover 22. The motor housing 40 constitutes a part of a motor unit 60, which will be described later.

[0027] (Regarding the saw cover 22) The saw cover 22 is configured as a member that covers the upper part of the circular saw blade 14. When viewed from the right side, the saw cover 22 is formed in a substantially semicircular shape that is convex upward, and is formed in a concave shape that is open downward. Specifically, the saw cover 22 includes an outer peripheral wall 22A that extends in a substantially circumferential direction of the circular saw blade 14 on the radially outer side of the circular saw blade 14, a right wall 22B that extends from the right end of the outer peripheral wall 22A toward the radially inner side of the outer peripheral wall 22A, and a left wall 22C that serves as a "side wall" that extends from the left end of the outer peripheral wall 22A toward the radially inner side of the outer peripheral wall 22A. The right wall 22B is formed in a substantially semicircular plate shape that is convex upward in a side view, and the left wall 22C is formed in a substantially semicircular arc plate shape that is convex upward in a side view. A transmission mechanism accommodating portion 22D (see FIG. 4) for accommodating a transmission mechanism 72 described later is formed in a middle portion in the front-rear direction at the lower end of the right wall 22B. The transmission mechanism accommodating portion 22D is formed in a substantially rectangular tubular shape and protrudes to the right from the right wall 22B.

[0028] The front end of the saw cover 22 is connected to the front end of the base 12 via the front connecting mechanism 16, and the rear end of the saw cover 22 is connected to the rear end of the base 12 via the rear connecting mechanism 18. When cutting a workpiece, the circular saw blade 14 rotates in one direction (the direction of the arrow E in FIG. 2), and chips as cut pieces are wound up at the front end of the circular saw blade 14 and flow rearward on the radial outside of the circular saw blade 14 in the saw cover 22. The saw cover 22 is further provided with a discharge passage 80 (see FIG. 2), which discharges the chips to the outside of the saw cover 22. The discharge passage 80 will be described later.

[0029] (Regarding the handle housing 30) As shown in Figs. 1 to 5, the handle housing 30 is disposed on the right side of the saw cover 22. The handle housing 30 is composed of two handle housing members divided in the left-right direction, and the handle housing 30 is formed by assembling the divided handle housing members together. Specifically, after the left handle housing member is assembled to the saw cover 22, the right handle housing member is assembled to the left handle housing member.

[0030] The handle housing 30 is formed in a generally U-shape that is open to the front when viewed from the right side. Specifically, the handle housing 30 includes a handle 31 that constitutes the rear end of the handle housing 30, an upper housing portion 32 that extends forward from the handle 31 and constitutes the upper end of the handle housing 30, and a lower housing portion 33 that extends forward from the handle 31 and constitutes the lower end of the handle housing 30.

[0031] The handle 31 is configured as a gripping portion that is held by a user. The handle 31 is disposed rearward of the saw cover 22, and extends in a direction that inclines forward as it moves upward in a side view. More specifically, the handle 31 is slightly inclined forward with respect to the second direction in a side view. A trigger 50 is provided at an upper end portion of the handle 31. The trigger 50 protrudes forward from the handle 31, and is configured to be pulled rearward. In addition, the handle 31 is provided with a lock button 51 for locking the pulling operation of the trigger 50, obliquely above and rearward of the trigger 50, and is configured such that the trigger 50 cannot be pulled unless the lock button 51 is operated. Furthermore, inside the handle 31, a switch mechanism 52 (see FIGS. 4 and 5) is provided behind the trigger 50. The switch mechanism 52 has a switch (not shown) that is operated by the trigger 50. The switch is electrically connected to a controller 70 (described later) and outputs an output signal to the controller 70 according to the operation state of the trigger 50.

[0032] The upper housing portion 32 extends toward one side in the first direction from an upper end portion of the handle 31. A front end portion of the upper housing portion 32 is located to the right of the saw cover 22 and above the transmission mechanism accommodating portion 22D, and is fixed to the saw cover 22. The lower housing portion 33 extends forward from a lower end portion of the handle 31. A front end portion of the lower housing portion 33 is located to the right of the saw cover 22 and rearward of the front end portion of the upper housing portion 32, and is fixed to the saw cover 22.

[0033] The handle housing 30 has a handle intermediate portion 34, which connects a longitudinal intermediate portion of the upper housing portion 32 to a front end portion and a longitudinal intermediate portion of the lower housing portion 33. The handle intermediate portion 34 is disposed adjacent to the other side of the transmission mechanism accommodating portion 22D of the saw cover 22 in the first direction.

[0034] A battery storage section 35 for storing a battery pack 54 (described later) is formed in the front of the handle intermediate section 34. The battery storage section 35 is formed in a recessed shape that opens to the right side, and is disposed adjacent to the other side of the transmission mechanism storage section 22D in the first direction. The battery storage section 35 is formed in a substantially rectangular shape when viewed from the right side, and is inclined along the first direction with respect to the front-rear direction. The outer peripheral wall of the battery storage section 35 is configured as a partition wall 35A, and the partition wall 35A does not have a front wall, and the battery storage section 35 is open to one side in the first direction. Furthermore, a wiring insertion section 35B (see Figs. 4 and 5) is formed at the front end of the upper wall of the partition wall 35A. The wiring insertion section 35B is formed in the partition wall 35A of the left handle housing member, and is formed in a recessed shape that opens to the right side. As a result, the wiring insertion section 35B communicates with the inside of the battery storage section 35 and the inside of the upper housing section 32.

[0035] 4 and 5, a pair of front and rear controller holding portions 32A for holding a controller 70, which will be described later, are formed in the upper housing portion 32 on one side in the second direction relative to the battery accommodating portion 35. Furthermore, the space in the upper housing portion 32 on the other side in the second direction relative to the controller holding portions 32A is configured as a wire accommodating portion 32B for accommodating wires 45 and wires 66, which will be described later. The wire accommodating portion 32B and the battery accommodating portion 35 are partitioned by a partition wall 35A of the battery accommodating portion 35, and are communicated with each other by a wire insertion portion 35B.

[0036] The internal space at the front end of upper housing portion 32 is configured as air passage 32C for flowing cooling air AR generated by fan 67, which will be described later, toward controller 70. As shown in Fig. 8, air passage 32D is formed through the lower wall at the front end of upper housing portion 32, and air passage 32C communicates with the outside of upper housing portion 32 via air passage 32D.

[0037] (Regarding the motor housing 40) As shown in Fig. 1 and Figs. 3 to 8, the motor housing 40 constitutes a part of the motor unit 60 described later, and is configured as a member that houses the brushless motor 61 of the motor unit 60. A battery pack 54 described later is detachably attached to the motor housing 40, and the motor housing 40 is also configured as a member that supports the attached battery pack 54. Furthermore, the motor housing 40 is composed of motor housing members 40A and 40B that are divided into two in the second direction, and the motor housing 40 is formed by assembling the motor housing members 40A and 40B together.

[0038] The motor housing 40 has a motor cover portion 41, which is formed in a generally bottomed cylindrical shape that is open to the left. The motor cover portion 41 is disposed on the right side of the transmission mechanism accommodating portion 22D of the saw cover 22, and the left end portion of the motor cover portion 41 is fastened and fixed to the side wall portion of the transmission mechanism accommodating portion 22D. As a result, the motor housing 40 is disposed adjacent to the other side of the front end portion of the upper housing portion 32 in the second direction.

[0039] A plurality of intake holes 41A are formed at the corners on both sides in the second direction at the right end of the motor cover part 41. The intake holes 41A extend in the left-right direction from the bottom wall to the side wall of the motor cover part 41 and are arranged side by side in the first direction. An exhaust hole 41B (see Figs. 4, 7, and 8) is formed at one side in the second direction at the left end of the motor cover part 41, and the exhaust hole 41B is arranged below the air blowing hole 32D of the upper housing part 32. As a result, the inside of the motor cover part 41 and the air blowing path 32C are in communication with each other via the exhaust hole 41B and the air blowing hole 32D.

[0040] 4 to 7, the motor housing 40 has a battery attachment section 42 (broadly speaking, an element that can be understood as a power supply support section). The battery attachment section 42 protrudes from a left portion (opening side portion) of the motor cover section 41 toward the other side in the first direction, and is disposed within one end of the battery storage section 35 in the handle housing 30 on one side in the first direction. In addition, the left end of the battery attachment section 42 protrudes leftward beyond the motor cover section 41.

[0041] The battery mounting section 42 is formed with a battery insertion section 42A that is open to the other side and the right side in the first direction. In addition, a pair of housing side rail sections 42B are formed on both side walls in the second direction of the battery insertion section 42A. The housing side rail sections 42B are formed in a groove shape that is open to the inside in the second direction and extend in the left-right direction. In addition, the battery mounting section 42 is provided with a battery terminal 44 (see Figs. 5 and 6) as a power supply section, and the battery terminal 44 is sandwiched by the motor housing members 40A and 40B from both sides in the second direction. The battery terminal 44 is exposed to one side in the first direction from the battery insertion section 42A and is electrically connected to a controller 70 (described later) by a wiring 45 (see Figs. 5 and 6).

[0042] A wiring hole 42C is formed as a wiring arrangement part at the left end of the battery mounting part 42 on one side in the first direction from the battery terminal 44. The wiring hole 42C is a hole that opens to the left side and penetrates in the second direction. The wiring hole 42C penetrates in the second direction to communicate the motor housing 40 with the outside. The wiring hole 42C is disposed on the other side in the second direction with respect to the wiring insertion part 35B of the handle housing 30. In addition, a part of the battery terminal 44 is exposed in the wiring hole 42C, and the wiring 45 extending from the battery terminal 44 is arranged in the wiring hole 42C, the wiring insertion part 35B, and the wiring housing part 32B, and is connected to the controller 70 described later (see FIGS. 5 and 6).

[0043] A wiring insertion hole 42D (see FIGS. 6 and 7) is formed penetrating the bottom wall of the wiring hole portion 42C, and the wiring insertion hole 42D extends along the longitudinal direction of the wiring hole portion 42C. The wiring hole portion 42C and the motor cover portion 41 are connected to each other by the wiring insertion hole 42D.

[0044] (Battery Pack 54) As shown in Figures 1, 3 and 9, the battery pack 54 is formed in a substantially rectangular parallelepiped shape. A connector section 54A is provided at the top of the battery pack 54. Battery side rail sections 54B are formed at both widthwise ends of the connector section 54A. The battery side rail sections 54B are formed in a substantially inverted L-shape when viewed from the front side of the battery pack 54, extend in the longitudinal direction of the battery pack 54 and are open to the front side.

[0045] The battery pack 54 is accommodated in the battery accommodating section 35 of the housing 20 from the right side, and is attached to the battery attachment section 42 of the motor housing 40. Specifically, the housing side rail section 42B is inserted into the battery side rail section 54B so as to be slidable in the left-right direction, and the housing side rail section 42B and the battery side rail section 54B are engaged in the first direction. Furthermore, when the battery pack 54 is attached, the connector section 54A is connected to the battery terminal 44 of the motor housing 40, and power is supplied from the battery pack 54 to a controller 70, which will be described later.

[0046] Furthermore, locking members 54C are provided on the sides of the battery pack 54. When the battery pack 54 is attached, the locking members 54C engage with the motor housing 40, so that the attached state of the battery pack 54 is maintained.

[0047] Furthermore, when the battery pack 54 is attached to the battery attachment portion 42, the left end of the battery pack 54 is located to the left of the fan 67, which will be described later, and the right end of the battery pack 54 is located to the left of the right end of the motor housing 40. In other words, the battery pack 54 is arranged so as not to protrude to the right of the motor housing 40. Furthermore, in this state, the locking member 54C is located to the right of the handle housing 30, and the locking member 54C is configured to be capable of being operated to unlock.

[0048] (Regarding the sub-handle 56) As shown in Figs. 1 to 3, the sub-handle 56 extends in the left-right direction and is formed in a generally U-shape that is open downward when viewed from the rear. The right end of the sub-handle 56 is fastened and fixed to the front end of the upper housing part 32 of the handle housing 30. The left end of the sub-handle 56 is fastened and fixed to the upper end of the saw cover 22. The sub-handle 56 protrudes upward (more specifically, to one side in the second direction) from the housing 20. The left end of the sub-handle 56 is disposed forward of the right end of the sub-handle 56, and the sub-handle 56 is slightly inclined forward as it approaches the left side when viewed from above.

[0049] (Regarding the Motor Unit 60) As shown in Figs. 4 to 6 and 8, the motor unit 60 includes the motor housing 40 described above and a brushless motor 61 serving as a prime mover.

[0050] (Brushless Motor 61) The brushless motor 61 is accommodated in the motor cover portion 41 of the motor housing 40. The brushless motor 61 includes a drive shaft 62, a rotor 63, and a stator 64.

[0051] The drive shaft 62 is disposed with its axial direction aligned in the left-right direction. A right end portion (one axial end portion) of the drive shaft 62 is rotatably supported by a first motor bearing 68 fixed to the motor housing 40, and a left portion of the drive shaft 62 is rotatably supported by a second motor bearing 69 fixed to the transmission mechanism accommodating portion 22D of the saw cover 22. A left end portion of the drive shaft 62 protrudes to the left from the second motor bearing 69, and a pinion gear 62A is formed on the left end portion of the drive shaft 62.

[0052] The rotor 63 is formed in a generally cylindrical shape with its axial direction extending in the left-right direction, is disposed radially outside the drive shaft 62, and is configured to be rotatable integrally with the drive shaft 62. The stator 64 is formed in a generally cylindrical shape with its axial direction extending in the front-rear direction, and is supported by the motor housing 40 at a radially outer side of the rotor 63. The stator 64 has a stator holder 64A, and a stator coil is wound around the stator holder 64A. A motor board 65 is fixed to the right end of the stator holder 64A, and the stator coil is connected to the motor board 65.

[0053] The motor board 65 is electrically connected to a controller 70 (described later) by wiring 66 (see Figs. 5 and 6). Specifically, the wiring 66 extending from the motor board 65 is disposed on the other side of the brushless motor 61 in the first direction, passes through the wiring insertion hole 42D, and is routed in the wiring hole portion 42C. The wiring 66 is bent to one side in the first direction in the wiring hole portion 42C, passes through the wiring insertion portion 35B, is routed in the wiring housing portion 32B, and is connected to the controller 70 (described later).

[0054] A fan 67 is provided on the left side of the drive shaft 62 to the right of the second motor bearing 69 so as to be rotatable together with the drive shaft 62. The fan 67 is configured as a centrifugal fan, and the exhaust hole 41B of the motor housing 40 described above is disposed radially outward of the fan 67. As a result, when the fan 67 rotates, the cooling air AR flows into the motor housing 40 from the intake hole 41A of the motor housing 40 and is discharged from the exhaust hole 41B, so that the cooling air AR cools the brushless motor 61. Furthermore, the cooling air AR discharged from the exhaust hole 41B flows into the air passage 32C from the air passage 32D of the handle housing 30 and flows through the air passage 32C to the other side in the first direction (see FIGS. 5 and 8).

[0055] (Regarding the controller 70) As shown in Figs. 4 and 5, the controller 70 is formed in a substantially rectangular flat shape with the second direction as the thickness direction. The controller 70 is attached to a pair of controller holding portions 32A of the handle housing 30 and accommodated in the upper housing portion 32. That is, the controller 70 is disposed on one side in the second direction of the wire accommodating portion 32B of the upper housing portion 32. The controller 70 has a control board (not shown), and the wires 45 and 66 accommodated in the wire accommodating portion 32B are connected to the control board. The control board has an inverter circuit that performs various controls such as drive control of the brushless motor 61, and the inverter circuit is configured as a circuit in which a plurality of switching elements are bridge-connected.

[0056] 8, the transmission mechanism 72 has an output shaft 73 as an output part whose axial direction is in the left-right direction, and the output shaft 73 is disposed within the transmission mechanism accommodating portion 22D of the saw cover 22 and disposed below the drive shaft 62 of the brushless motor 61. A right end portion of the output shaft 73 is rotatably supported by a first bearing 74 fixed to the transmission mechanism accommodating portion 22D, and a left portion of the output shaft 73 is rotatably supported by a second bearing 75 connected to the saw cover 22.

[0057] A transmission gear 76 is provided on the right side of the output shaft 73 so as to be rotatable together with the output shaft 73, and the transmission gear 76 is meshed with the pinion gear 62A of the drive shaft 62. The left end of the output shaft 73 is configured as a tool attachment portion 73A. The tool attachment portion 73A is formed in a substantially cylindrical shape, and a female thread is formed on the inner periphery of the tool attachment portion 73A. The circular saw blade 14 is attached to the tool attachment portion 73A by inserting the center of the circular saw blade 14 into the tool attachment portion 73A and screwing the bolt BL into the tool attachment portion 73A. As a result, the output shaft 73 and the circular saw blade 14 are configured to rotate around the axis of the output shaft 73 when the brushless motor 61 is driven.

[0058] As shown in Figs. 1 and 2, the lower part of the circular saw blade 14 is covered with a protective cover 78. The protective cover 78 is formed in a substantially semicircular shape that is convex downward when viewed from the right side, and is formed in a concave shape that is open upward. The protective cover 78 is connected to the output shaft 73 so as to be rotatable around the axis of the output shaft 73. The protective cover 78 is biased around the axis of the output shaft 73 by a biasing spring (not shown) and is held in the position shown in Figs. 1 and 2. During cutting processing by the cutting machine 10, the protective cover 78 is rotated against the biasing force of the biasing spring by the workpiece, and is disposed inside the saw cover 22, so that the blade part of the circular saw blade 14 is exposed. During the cutting processing, chips are rolled up at the front end of the circular saw blade 14 and flow rearward between the protective cover 78 and the outer peripheral wall 22A of the saw cover 22.

[0059] (Regarding the discharge path 80) Next, the discharge path 80 provided in the saw cover 22 will be described. As shown in Fig. 2, Fig. 8, and Figs. 10 to 13, the discharge path 80 is provided in the outer peripheral portion of the rear end side of the saw cover 22, and is disposed rearward with respect to the center of the circular saw blade 14 and radially outward from the circular saw blade 14. Specifically, the discharge path 80 is disposed radially outward from the protective cover 78 disposed inside the saw cover 22. Then, chips flowing rearward between the protective cover 78 and the outer peripheral wall 22A of the saw cover 22 are discharged to the left side of the saw cover 22 by the discharge path 80.

[0060] The discharge passage 80 is formed in a concave shape that is open to the left side. That is, a discharge port 81 that constitutes an opening of the discharge passage 80 is formed in the left wall 22C of the saw cover 22, and the discharge port 81 extends in the circumferential direction of the circular saw blade 14 when viewed from the left side (the opening side of the discharge passage 80). That is, the discharge port 81 extends in a direction that inclines downward toward the rear side when viewed from the left side. A rear end edge portion 81A of the discharge port 81 extends along the up-down direction. A lower end edge portion 81B of the discharge port 81 extends along the front-rear direction. The lower end of the rear end edge portion 81A and the rear end of the lower end edge portion 81B are connected to each other. The area surrounded by the rear end edge portion 81A and the lower end edge portion 81B of the discharge port 81 is configured as a discharge outlet portion 82 (see the area indicated by the two-dot chain line in FIG. 10), and the chips that flow into the discharge passage 80 are mainly discharged from the discharge outlet portion 82. In addition, the upper inclined edge portion 81C and the lower inclined edge portion 81D of the outlet 81 are arranged approximately parallel, with the rear end of the upper inclined edge portion 81C connected to the upper end of the rear edge portion 81A, and the rear end of the lower inclined edge portion 81D connected to the front end of the lower edge portion 81B.

[0061] Furthermore, the discharge passage 80 opens to the front side, and the opening is configured as an inlet portion, that is, a discharge inlet portion 83. That is, the discharge passage 80 has an inlet portion (discharge inlet portion 83) that opens to the front. As a result, the inside of the discharge passage 80 and the inside of the saw cover 22 are communicated by the discharge inlet portion 83, and the chips are configured to flow into the discharge passage 80 from the discharge inlet portion 83.

[0062] The discharge path 80 has a side guide surface 84 that constitutes the left side surface of the discharge path 80. The discharge path 80 also has an upper surface 85 extending to the right from an upper inclined edge portion 81C of the discharge outlet 81, a lower surface 86 extending to the right from a lower inclined edge portion 81D of the discharge outlet 81, a rear guide surface 87 extending to the right from a rear end edge portion 81A of the discharge outlet 81, and a lower guide surface 88 extending to the right from a lower end edge portion 81B of the discharge outlet 81. The right ends of the upper surface 85, the lower surface 86, the rear guide surface 87, and the lower guide surface 88 are connected to the side guide surface 84, and the discharge path 80 is formed in a concave shape that is open to the left. The upper surface 85 of the discharge path 80 is formed by the inner peripheral surface of the outer peripheral wall 22A of the saw cover 22. In addition, in FIG. 11, the flat surfaces (side guide surface 84, rear guide surface 87, lower guide surface 88) are depicted as being continuously connected, but as shown in FIGS. 12 and 13, the connecting portions of the flat surfaces are formed into gently curved surfaces.

[0063] The side guide surface 84 is inclined leftward as it approaches the rear side when viewed from above. Specifically, the inclination angle AG1 of the side guide surface 84 with respect to the front-rear direction (see FIG. 12(B)) is set to be 10 degrees or more and 50 degrees or less (30 degrees in this embodiment). The front end of the side guide surface 84 is disposed on the right side of the circular saw blade 14. As a result, the chips flowing into the discharge passage 80 flow diagonally downward toward the rear along the side guide surface 84 and toward the discharge port 81 (see the arrow DS shown in FIGS. 10 and 11). That is, the side guide surface 84 is configured as a surface that guides the chips flowing from the discharge inlet portion 83 to the left side (the discharge outlet portion 82 side). The side guide surface 84 is a part of the guide surface in the present invention. The side guide surface 84 is an example of the first guide surface in the present invention. The guide surface in the present invention is a wall portion that guides the chips flowing into the discharge passage 80 to flow toward the discharge port 81 side. The side guide surface 84 functions as a guide surface for chips moving rearwardly.

[0064] The rear guide surface 87 is inclined rearward as it goes leftward when viewed from above, and the right end of the upper part of the rear guide surface 87 is connected to the rear end of the side guide surface 84. The inclination angle AG2 of the rear guide surface 87 with respect to the front-rear direction (see FIG. 12B) is set to be larger than the inclination angle AG1 of the side guide surface 84. More specifically, the inclination angle AG2 of the rear guide surface 87 with respect to the front-rear direction is set to be 60 degrees or more and 90 degrees or less (80 degrees in this embodiment). The right end of the rear guide surface 87 is disposed to the left of the circular saw blade 14. As a result, the chips that flow along the side guide surface 84 to the rear end of the side guide surface 84 hit the rear guide surface 87 and flow along the rear guide surface 87 to the left (discharge port 81 side) (see the arrow DS shown in FIGS. 10 and 11). That is, the rear guide surface 87 is configured as a guide surface that changes the outflow direction of the chips that flow to the rear end of the discharge path 80 to the left (discharge port 81 side). The rear guide surface 87 is a part of the guide surface in the present invention. The rear guide surface 87 is an example of a second guide surface in the present invention. The rear guide surface 87 functions as a guide surface for chips moving rearward. In this way, the inclination angle of the guide surface for chips in the left-right direction is set in two stages by the side guide surface 84 and the rear guide surface 87, and becomes larger toward the left. In addition, it is preferable to set the inclination angle AG1 and the inclination angle AG2 of the rear guide surface 87 and the inclination angle AG1 of the side guide surface 84 so that the difference between them is less than 60 degrees.

[0065] The lower guide surface 88 is disposed below the rear end of the side guide surface 84 and adjacent to the front side of the lower part of the rear guide surface 87, and is connected to the side guide surface 84 and the rear guide surface 87. The lower guide surface 88 is inclined downward as it proceeds to the left when viewed from the front-rear direction.

[0066] The lower guide surface 88 includes an upper lower guide surface 88A constituting the upper portion of the lower guide surface 88, and a lower lower guide surface 88B constituting the lower portion of the lower guide surface 88. The upper lower guide surface 88A is formed in a substantially triangular shape when viewed from the left side, and the vertical width of the upper lower guide surface 88A when viewed from the left side is set to become wider toward the rear side. In addition, the inclination angle AG3 (see FIG. 13) of the upper lower guide surface 88A in the vertical direction is set to be smaller than the inclination angle AG4 (see FIG. 13) of the lower lower guide surface 88B in the vertical direction. As a result, the inclination angle of the lower guide surface 88 in the vertical direction is set in two stages, and becomes larger toward the lower side. In addition, the inclination angle of the upper lower guide surface 88A in the front-rear direction is slightly larger than the inclination angle AG1 of the side guide surface 84 (32 degrees in this embodiment). The lower guide surface 88 is an example of a guide surface in the present invention. The upper lower guide surface 88A is a part of the guide surface in the present invention, and is an example of a first guide surface. The lower lower guide surface 88B is a part of the guide surface in the present invention, and is an example of a second guide surface. The upper lower guide surface 88A functions as a guide surface for chips moving backward. The upper lower guide surface 88A also functions as a guide surface for chips moving downward. The lower lower guide surface 88B functions as a guide surface for chips moving downward.

[0067] (About the Suspension Mechanism 90) As shown in Figs. 1 to 4 and 14, the suspension mechanism 90 includes a fixed member 91, a suspension arm 92, and a clutch 94. The fixed member 91 is fastened and fixed to the upper end of the handle housing 30, and is disposed on the rear side of the sub-handle 56. The fixed member 91 has a support tube 91A, which is formed in a substantially cylindrical shape with the first direction as its axial direction. A step portion 91B is formed on the inner periphery of the support tube 91A, and the inner diameter of the support tube 91A on one side in the first direction is set smaller than the inner diameter of the support tube 91A on the other side in the first direction.

[0068] The suspending arm 92 is configured of a rod-shaped member having a circular cross section, and is bent into a predetermined shape. A base end (one end) of the suspending arm 92 is configured as a supported part 92A. The supported part 92A of the suspending arm 92 is inserted into the supporting cylinder part 91A and is rotatably supported by the supporting cylinder part 91A, and the suspending arm 92 extends from the supporting cylinder part 91A to the other side in the first direction. Specifically, the suspending arm 92 is configured to rotate between a stored position (a position indicated by a solid line in FIG. 1) and a deployed position rotated approximately 90 degrees from the stored position (a position indicated by a two-dot chain line in FIG. 1).

[0069] An offset portion 92B is formed at the middle of the suspending arm 92, which is bent at a right angle toward the radial outside of the supported portion 92A. A hook 92C is formed at the tip of the suspending arm 92, and the hook 92C is formed in a substantially U-shape that is open toward one side in the first direction. Specifically, the hook 92C includes a first hook portion 92C1 extending from the tip of the offset portion 92B toward the other side in the first direction, a second hook portion 92C2 extending from the tip of the first hook portion 92C1 toward the radial outside of the supported portion 92A and disposed parallel to the offset portion 92B, and a third hook portion 92C3 extending from the tip of the second hook portion 92C2 toward the one side in the first direction. As a result, the hook 92C is disposed radially outward from the supported portion 92A by the offset portion 92B, and disposed on the other side in the first direction relative to the supported portion 92A and the sub-handle 56.

[0070] Furthermore, in the stored position of the suspending arm 92, the offset portion 92B is bent to the left from the supported portion 92A, and the hook 92C is disposed to the left of the supported portion 92A and does not protrude upward (one side in the second direction) relative to the supported portion 92A. On the other hand, in the deployed position of the suspending arm 92, the offset portion 92B is extended upward (one side in the second direction) from the supported portion 92A, and the hook 92C is disposed upward (one side in the second direction) relative to the supported portion 92A. Furthermore, in the deployed position of the suspending arm 92, the entire suspending arm 92 is disposed to overlap the sub-handle 56 in the left-right direction.

[0071] Further, the second hook portion 92C2 and the third hook portion 92C3 are formed with a wedge portion 92D, and the wedge portion 92D protrudes from the second hook portion 92C2 and the third hook portion 92C3. When the cutting machine 10 is suspended by hooking the hook 92C on a suspension support member 100 (see FIGS. 15(A) and (B)) for wood or the like, the wedge portion 92D can be caused to bite into the suspension support member 100.

[0072] 14, a pair of stoppers 93A, 93B are provided on supported portion 92A of suspending arm 92. Stoppers 93A, 93B are formed in a generally cylindrical shape with an axial direction that is the radial direction of suspending arm 92, are fixed to suspending arm 92, and are arranged spaced apart in the longitudinal direction of suspending arm 92. One stopper 93A is arranged adjacent to one side of supporting cylinder portion 91A in the first direction via a washer 96, and movement of suspending arm 92 to the other side in the first direction is restricted by stopper 93A. The other stopper 93B is arranged on the other side of supporting cylinder portion 91A in the first direction.

[0073] The clutch 94 is formed in a cylindrical shape and is fitted onto the supported portion 92A of the support tube portion 91A. The clutch 94 is inserted into the support tube portion 91A so as to be movable in the axial direction of the support tube portion 91A and not rotatable in the circumferential direction of the support tube portion 91A. The clutch 94 is biased toward the other side in the first direction by a biasing spring 95 disposed in the support tube portion 91A, and one end of the clutch 94 abuts against a stopper 93B. Four engagement recesses 94A that are open toward the other side in the first direction are formed at one end of the clutch 94, and the four engagement recesses 94A are disposed at 90° intervals in the circumferential direction of the clutch 94. Both ends of the stopper 93B are engaged with the engagement recesses 94A, and the suspension arm 92 is held in the stored position or the deployed position. When suspending arm 92 rotates, clutch 94 is displaced within supporting cylinder portion 91A to one side in the first direction against the biasing force of biasing spring 95, thereby allowing suspending arm 92 to rotate.

[0074] Here, as shown in FIG. 1, the center of gravity G of the cutting machine 10 is located on one side in the first direction from the hook 92C in the unfolded position and on the other side in the first direction from the sub-handle 56, as viewed from the left-right direction. More specifically, the center of gravity G of the cutting machine 10 is located on one side in the first direction (front side) from the second hook portion 92C2, which mainly functions as a hook portion in the hook 92C. In addition, the vertical distance L1 between the center of gravity G of the cutting machine 10 and the hook 92C in the unfolded position is set to be longer than the vertical distance L2 between the center of gravity G of the cutting machine 10 and the bottom surface of the base 12. Furthermore, the position of the sub-handle 56 is set so that the center of gravity G of the cutting machine 10 and the sub-handle 56 overlap in the left-right direction (see FIG. 3). That is, the sub-handle 56 extends in the left-right direction so that the center of gravity G of the cutting machine 10 and the sub-handle 56 overlap in the left-right direction. Also, when viewed from the first direction, the base end of the hook 92C is disposed at a position overlapping the upper end of the sub-handle 56. In other words, the length of the offset portion 92B is set so that, when viewed from the left-right direction, a reference line CL extending in the first direction along the inner peripheral surface of the first hook portion 92C1 comes into contact with the upper end of the sub-handle 56. When the cutting machine 10 is not in use, the hook 92C is hooked from above onto the upper end of the hanging support member 100 extending in the vertical direction, thereby hanging the cutting machine 10 from the hanging support member 100 (see FIGS. 15(A) and (B)).

[0075] (Functions and Effects) Next, the functions and effects of the cutting machine 10 according to the present embodiment will be described.

[0076] When cutting is performed by the cutting machine 10 configured as described above, the base 12 is placed on the workpiece with the suspending arm 92 in the storage position. The trigger 50 is pulled to drive the brushless motor 61, causing the circular saw blade 14 to rotate in one direction. The cutting machine 10 is moved forward relative to the workpiece, whereby the workpiece is cut. At this time, the protective cover 78 is pressed by the workpiece and placed in the saw cover 22. The chips generated during the cutting are lifted up from the front end of the circular saw blade 14 inside the saw cover 22. The lifted chips flow rearward between the outer peripheral wall 22A of the saw cover 22 and the protective cover 78.

[0077] A discharge passage 80 is provided in the outer peripheral portion of the saw cover 22, and the discharge passage 80 is formed in a concave shape having a discharge port 81 open to the left side. A discharge inlet portion 83 open to the front side is formed in the front end portion of the discharge passage 80, and the inside of the saw cover 22 and the inside of the discharge passage 80 are connected by the discharge inlet portion 83. Furthermore, the discharge passage 80 has a side guide surface 84 that constitutes the right side surface of the discharge passage 80, and the side guide surface 84 is inclined to the left as it approaches the rear side when viewed from above. As a result, chips flowing to the rear side inside the saw cover 22 flow into the discharge passage 80, and the chips that flow into the discharge passage 80 are guided by the side guide surface 84 and flow to the rear end of the discharge passage 80.

[0078] Here, the rear surface of the discharge path 80 is formed by a rear guide surface 87, which is inclined rearward as it approaches the left side. Specifically, the inclination angle AG2 of the rear guide surface 87 with respect to the front-rear direction is set to 80 degrees and is set to be larger than the inclination angle AG1 of the side guide surface 84 with respect to the front-rear direction, which is 30 degrees. As a result, the chips that flow along the side guide surface 84 to the rear end side of the discharge path 80 hit the rear guide surface 87, and the flow direction of the chips is changed to the left side (toward the discharge port 81). As a result, the chips are discharged from the discharge port 81 to approximately the left side, thereby improving the operability of the cutting machine 10.

[0079] That is, when cutting with the cutting machine 10, an operator generally positions himself behind the circular saw blade 14 and moves the cutting machine 10 forward relative to the workpiece. More specifically, an operator positioned behind the cutting machine 10 moves the cutting machine 10 forward while gripping the handle 31 of the handle housing 30. For this reason, if the rear guide surface 87 is omitted in the discharge path 80 and the rear end of the side guide surface 84 is connected to the rear end edge portion 81A of the discharge port 81, the chips are discharged from the discharge port 81 diagonally to the left rear as viewed from above. That is, the chips discharged from the discharge port 81 may be blown toward the operator. In this case, the chips blown toward the operator may cause a decrease in workability.

[0080] In contrast, in the cutting machine 10 of this embodiment, as described above, the rear surface of the discharge path 80 is formed by the rear guide surface 87, and the chips that flow along the side guide surface 84 toward the rear end of the discharge path 80 hit the rear guide surface 87, changing the flow direction of the chips to the left (discharge port 81 side). More specifically, the chips that flow into the discharge path 80 are guided by the upper inclined edge portion 81C so that their movement direction is rearward and downward, and are guided by the side guide surface 84 to move to the left (discharge port 81 side). At this time, the chips are guided by the side guide surface 84, so that the speed of movement of the chips to the rear decreases. That is, the chips are urged to move to the left by contacting the side guide surface 84, while the movement to the rear is braked. The chips that have been guided by the side guide surface 84 come into contact with the rear guide surface 87 or the upper lower guide surface 88A. The chips that come into contact with the rear guide surface 87 are guided to the left (discharge port 81) side in the same manner as when they come into contact with the side guide surface 84, so that they lose their rearward moving force and move more toward the left. On the other hand, the chips that come into contact with the upper lower guide surface 88A after coming into contact with the side guide surface 84 are guided to the left while the rearward moving force is slightly reduced and discharged because the difference in the inclination angle between the side guide surface 84 and the upper lower guide surface 88A in the front-to-rear direction is small (2 degrees). If the rearward moving force is not sufficiently reduced by the contact with the upper lower guide surface 88A, the chips come into contact with the rear guide surface 87 after coming into contact with the upper lower guide surface 88A, and the rearward moving force is further reduced before being discharged. As a result, the chips are discharged from the discharge port 81 to the substantially left side, so that the chips can be prevented from being blown out toward the operator. In other words, the chips are discharged after the force of their rearward movement is sufficiently reduced by the structure of the discharge path 80, so that the chips can be prevented from being discharged toward the worker at the rear, thereby improving the operability of the cutting machine 10. As described above, the force of the chips' rearward movement is reduced multiple times (in multiple stages) by multiple surfaces, and the chips are guided to the left (i.e., the direction of movement is adjusted).For example, if one surface is used to reduce the force of the chips moving backward at once, the braking force may be too strong, and the force of the chips moving leftward may also be lost, causing the chips to adhere and accumulate inside the discharge path 80. In addition, if the discharge inlet 83 to the discharge outlet 81 are all connected by curved surfaces without using flat surfaces, the chips may come into contact with the inside of the discharge path 80 from the inlet to the outlet and be braked, so that the chips may stop inside the discharge path 80 due to excessive braking force. In contrast, in the present invention, the chip guide is made multi-staged by multiple surfaces, so that the chips can be prevented from being discharged backward without excessively losing their momentum, and workability can be improved while preventing the chips from accumulating and clogging. Note that if there are too many flat surfaces (to reduce the force of the chips moving backward), the brakes may work continuously as with curved surfaces, causing the momentum of the chips to be lost too much, so it is preferable to have at most about eight flat surfaces. In other words, it is preferable to have two or more and eight or less flat surfaces for guiding the chips.

[0081] The discharge passage 80 also has a lower guide surface 88, which is disposed below the rear end of the side guide surface 84 and adjacent to the front side of the lower part of the rear guide surface 87, and is connected to the side guide surface 84 and the rear guide surface 87. The lower guide surface 88 is inclined downward toward the left side when viewed from the front-rear direction. This allows the lower guide surface 88 to prevent chips that have flowed to the rear end of the discharge passage 80 from accumulating at the discharge outlet portion 82.

[0082] The lower guide surface 88 includes an upper lower guide surface 88A that constitutes the upper portion of the lower guide surface 88, and a lower lower guide surface 88B that constitutes the lower portion of the lower guide surface 88. Furthermore, the inclination angle AG3 of the upper lower guide surface 88A in the vertical direction is set smaller than the inclination angle AG4 of the lower lower guide surface 88B in the vertical direction. As a result, the inclination angle of the lower guide surface 88 in the vertical direction is set in two stages, and becomes larger toward the lower side. Therefore, chips that flow from the rear end of the side guide surface 84 toward the lower guide surface 88 can be effectively prevented from accumulating in the discharge outlet portion 82.

[0083] Moreover, the upper lower guide surface 88A is formed in a substantially triangular shape when viewed from the left side, and the vertical width of the upper lower guide surface 88A when viewed from the left side is set to become wider toward the rear side. This makes it possible to increase the proportion of the upper lower guide surface 88A at the rear end portion (the portion connected to the rear guide surface 87) of the lower guide surface 88. Therefore, the rear guide surface 87 and the lower guide surface 88 are smoothly connected, and the chips that flow into the periphery of the connection portion between the upper lower guide surface 88A and the rear guide surface 87 can be efficiently flowed to the lower lower guide surface 88B side and discharged from the discharge port 81. Therefore, it is possible to more effectively prevent the chips that flow from the rear end portion of the side guide surface 84 to the lower guide surface 88 side from accumulating in the discharge outlet portion 82.

[0084] Further, the discharge port 81 of the discharge passage 80 is formed on the outer periphery of the rear end side of the saw cover 22, and extends in the circumferential direction of the circular saw blade 14 as viewed from the left side. Specifically, the discharge port 81 is inclined downward as it approaches the rear side as viewed from the left side. This allows chips flowing rearward along the circumferential direction of the circular saw blade 14 to efficiently flow from the discharge inlet portion 83 of the discharge passage 80 into the inside of the discharge passage 80, and the chips that have flowed into the discharge passage 80 can be efficiently discharged from the discharge outlet portion 82.

[0085] In addition, the rear end edge 81A of the discharge port 81 extends in the vertical direction when viewed from the left side, and the rear guide surface 87 extends to the right side from the rear end edge 81A and is connected to the rear end of the side guide surface 84. This allows chips flowing to the left along the rear guide surface 87 to be efficiently discharged from the discharge outlet portion 82.

[0086] On the other hand, when the cutting machine 10 is not in use, the cutting machine 10 is suspended from the suspension support member 100 using the suspending arm 92. Specifically, as shown in FIGS. 15(A) and (B), the suspending arm 92 is rotated from the stored position to the deployed position, and the hook 92C of the suspending arm 92 is positioned above the housing 20. Then, the hook 92C of the suspending arm 92 is hooked from above onto the upper end of the suspension support member 100, which is extended vertically. As a result, the cutting machine 10 is suspended from the suspension support member 100.

[0087] Here, a sub-handle 56 is provided at the upper end of the handle housing 30, and the sub-handle 56 protrudes upward from the handle housing 30 and is disposed on one side in the first direction (the opening side of the hook 92C) of the hanging arm 92. Therefore, when the cutting machine 10 is suspended from the hanging support member 100, the sub-handle 56 is disposed vertically below the hook 92C and abuts against the hanging support member 100. This allows the cutting machine 10 in the suspended state to be supported by the sub-handle 56 abutting against the hanging support member 100 vertically below the hook 92C. Therefore, the cutting machine 10 can be suspended from the hanging support member 100 in a stable state.

[0088] Also, the center of gravity G of the cutting machine 10 is located on one side in the first direction from the hook 92C in a side view, and the sub-handle 56 is located on one side in the first direction from the center of gravity G of the cutting machine 10. In other words, in the suspended state, the center of gravity G and the sub-handle 56 are located below the hook 92C. Therefore, in the suspended state of the cutting machine 10, as viewed from the right side, a counterclockwise rotation moment about the contact portion between the hook 92C and the suspension support member 100 acts on the cutting machine 10. This allows the sub-handle 56 to abut against the suspension support member 100 in a state in which a pressing force substantially toward one side in the second direction acts on the suspension support member 100 from the sub-handle 56. Therefore, the suspended state of the cutting machine 10 can be further stabilized.

[0089] Also, the sub-handle 56 extends in the left-right direction. Therefore, in the suspended state of the cutting machine 10, the sub-handle 56 and one side surface 100A of the suspension support member 100 on the cutting machine 10 side can be abutted over the entire longitudinal direction of the sub-handle 56 (see FIG. 15(B)). That is, the sub-handle 56 can be abutted against one side surface 100A of the suspension support member 100 in a line, a surface, or multiple points. Therefore, the suspended state of the cutting machine 10 can be further stabilized. In this embodiment, the stable suspended state is realized by making the sub-handle 56 make line contact, but the present invention is not limited to this. In order to realize a stable suspended state, it is sufficient to abut the sub-handle 56 against the suspension support member 100 at two or more points. As a result, the cutting machine 10 can be supported at three or more points including the hook 92C, so that a stable suspended state can be realized. In this embodiment, the sub-handle 56 is in line contact with the hanging support member 100, but naturally, line contact is a collection of multiple point contacts, so there is contact at two or more points. In other words, contact at two or more points includes line contact and surface contact.

[0090] Furthermore, in the left-right direction, the hook 92C in the deployed position is disposed at a position overlapping the sub-handle 56, and the center of gravity G of the cutting machine 10 is disposed at a position overlapping the sub-handle 56. This allows the cutting machine 10 to be suspended from the suspension support member 100 with the pressing force acting from the sub-handle 56 on the suspension support member 100 acting approximately uniformly in the longitudinal direction of the sub-handle 56. This allows the suspended state of the cutting machine 10 to be effectively stabilized.

[0091] Furthermore, the vertical distance L1 between the center of gravity G of the cutting machine 10 and the hook 92C in the deployed position is set to be longer than the vertical distance L2 between the center of gravity G of the cutting machine 10 and the underside of the base 12. This makes it possible to increase the rotational moment generated in the suspended state of the cutting machine 10 while positioning the center of gravity G of the cutting machine 10 closer to the base 12 on which the workpiece is placed when cutting the workpiece. This makes it possible to stabilize the suspended state of the cutting machine 10 while improving the operability of the cutting machine 10.

[0092] The suspending arm 92 is configured to include a supported portion 92A constituting the base end of the suspending arm 92, an offset portion 92B constituting the middle portion of the suspending arm 92, and a hook 92C constituting the tip end of the suspending arm 92. The supported portion 92A is rotatably supported by the fixed member 91, and the offset portion 92B is bent at a substantially right angle radially outward from the supported portion 92A, so that the hook 92C in the deployed position is disposed above the supported portion 92A. This allows, for example, the vertical distance L1 between the center of gravity G of the cutting machine 10 and the hook 92C to be easily set by the offset portion 92B.

[0093] Also, when viewed from the first direction, the upper end (end in the protruding direction) of the sub-handle 56 and the tip of the offset portion 92B overlap. Therefore, the upper end of the sub-handle 56 and the first hook portion 92C1 of the hook 92C can be positioned to overlap in the first direction. As a result, when the cutting machine 10 is suspended from the suspension support member 100, the upper end of the sub-handle 56 can be positioned vertically below the first hook portion 92C1.

[0094] Furthermore, the suspending arm 92 is rotatably supported by the fixed member 91, and rotates between a stored position and an deployed position. In the deployed position of the suspending arm 92, the hook 92C protrudes from the sub-handle 56 to one side in the second direction, enabling the hook 92C to be hooked onto the suspension support member 100, and in the stored position of the suspending arm 92, the hook 92C is disposed at a position where it does not protrude from the sub-handle 56 to one side in the second direction, rendering the hook 92C unable to be hooked onto the suspension support member 100. As a result, by disposing the suspending arm 92 at the stored position, cutting can be performed with the suspending arm 92 stored on the handle housing 30 side.

[0095] Furthermore, in the cutting machine 10, the controller 70 is accommodated in the handle housing 30, and the controller 70 is configured to include an inverter circuit that controls the brushless motor 61. The brushless motor 61 is accommodated in the motor housing 40, and the motor housing 40 has a battery mounting portion 42 that supports the battery terminal 44. That is, in the cutting machine 10, the controller 70 including the inverter circuit that controls the brushless motor 61 is accommodated in the handle housing 30 that is separate from the motor housing 40 that accommodates the brushless motor 61. This allows the motor housing 40 (i.e., the motor unit 60) to be made smaller, and thus the cutting machine 10 to be made smaller. In particular, in the cutting machine 10 having the motor housing 40 that protrudes to the right with respect to the handle housing 30, the size of the cutting machine 10 can be made smaller, particularly in the right direction.

[0096] Further, a wiring hole 42C is formed in the motor housing 40, and the wiring 45 extending from the battery terminal 44 and the wiring 66 extending from the brushless motor 61 are routed in the wiring hole 42C, and are extended from the wiring hole 42C to be connected to the controller 70. This improves the assembly performance of the cutting machine 10. That is, the motor housing 40 can be assembled to the saw cover 22 while the motor unit 60 is connected to the controller 70 as a unit and the controller 70 is assembled to the handle housing 30. At this time, the wiring 45 and the wiring 66 extending from the motor unit 60 can be accommodated in the wiring accommodating portion 32B of the handle housing 30 while being processed together. This improves the assembly performance of the cutting machine 10 compared to, for example, a configuration in which the wiring 45 and the wiring 66 are processed separately.

[0097] In the motor unit 60, the brushless motor 61 is disposed on one side of the battery terminal 44 in the first direction, and the wiring hole 42C of the motor housing 40 is disposed between the battery terminal 44 and the brushless motor 61. Furthermore, the controller 70 is disposed on one side of the battery terminal 44 in the second direction. The wiring 45 and the wiring 66 extending from the wiring hole 42C are accommodated in the wiring accommodating portion 32B and disposed on the other side of the second direction with respect to the controller 70. That is, the battery pack 54, the wiring 45, the wiring 66, and the controller 70 can be arranged together on the other side of the first direction with respect to the brushless motor 61, and can be arranged side by side in the second direction. This contributes to the miniaturization of the cutting machine 10.

[0098] Moreover, the wiring hole portion 42C is formed in a groove shape penetrating in the second direction, and the wiring 45 and the wiring 66 extend from the wiring hole portion 42C to one side in the second direction and are bent to the other side in the first direction to be disposed on the other side in the second direction with respect to the controller 70. This allows the wiring 45 and the wiring 66 extended from the motor housing 40 to be disposed on the other side in the second direction of the controller 70 while forming the wiring 45 and the wiring 66 to extend toward the controller 70 side by the wiring hole portion 42C.

[0099] In addition, a fan 67 is provided on the drive shaft 62 of the brushless motor 61 so as to be able to rotate integrally therewith. Furthermore, an air outlet 32D is formed in the upper housing portion 32, and an exhaust hole 41B is formed in the motor housing 40, and the cooling air AR generated by the fan 67 flows into the air outlet 32C at the front end of the handle housing 30 through the exhaust hole 41B and the air outlet 32D. As a result, the cooling air AR passes through the air outlet 32C and is guided to the controller 70. As described above, the wiring 45 and the wiring 66 are housed on the other side of the controller 70 in the second direction. As a result, the cooling air AR can be guided to the controller 70 while preventing the wiring 45 and the wiring 66 from obstructing the flow of the cooling air AR toward the controller 70. Therefore, the controller 70 can be cooled well.

[0100] Furthermore, the battery pack 54 is disposed on the other side in the second direction with respect to the wire housing 32B of the handle housing 30, and a partition wall 35A that partitions the battery housing 35 (battery pack 54) and the wire housing 32B is formed in the handle housing 30. This allows the wires 45 and 66 connected to the controller 70 to be routed inside the wire housing 32B along the partition wall 35A, while the battery pack 54 is disposed on the other side in the second direction with respect to the controller 70.

[0101] Further, a wire insertion portion 35B is formed in the partition wall 35A, and the wire insertion portion 35B is disposed on one side in the second direction of the wire hole portion 42C of the motor housing 40. This allows the wires 45 and 66 extending from the wire hole portion 42C to one side in the second direction to be inserted through the wire insertion portion 35B and housed in the handle housing 30, and allows the wires 45 and 66 to be bent to the other side in the first direction by utilizing the wire insertion portion 35B.

[0102] Furthermore, when the battery pack 54 is attached, the left end of the battery pack 54 is disposed to the left of the fan 67, and the battery pack 54 is disposed in a position where it does not protrude to the right of the motor housing 40. This improves the protection performance for the battery pack 54.

[0103] Further, the motor housing 40 is composed of motor housing members 40A and 40B that are divided into two in the second direction, and the battery terminal 44 is sandwiched between the motor housing members 40A and 40B and held in the battery mounting portion 42. This allows the battery terminal 44 to be provided in the battery mounting portion 42 with a simple configuration. [Explanation of symbols]

[0104] 10...cutting machine (work machine), 14...circular saw blade, 22...saw cover, 61...brushless motor (prime mover), 73...output shaft, 80...discharge path, 81...discharge outlet, 81A...rear end edge, 83...discharge inlet (inlet), 84...side guide surface, 87...rear guide surface, 88...lower guide surface, 88A...upper lower guide surface, 88B...lower lower guide surface

Claims

1. An output shaft extending in the left-right direction and driven by the power of a prime mover; a circular saw blade held at one end of the output shaft in the left-right direction; A saw cover that covers an upper portion of the circular saw blade; a discharge passage provided in the saw cover, arranged radially outward of the circular saw blade, having a discharge port open to one side in the left-right direction, and discharging workpieces flowing rearward inside the saw cover during processing from the discharge port; Equipped with the discharge passage has a lower guide surface that forms a lower surface of the discharge passage and is inclined downward toward one side in the left-right direction when viewed from the front-rear direction, The lower guide surface is an upper lower guide surface constituting an upper portion of the lower guide surface; a lower lower guide surface constituting a lower portion of the lower guide surface; It is composed of A work machine, wherein an inclination angle of the upper lower guide surface with respect to the vertical direction is set smaller than an inclination angle of the lower lower guide surface with respect to the vertical direction.

2. The work machine described in claim 1, wherein the discharge passage has a side guide surface that forms the other side of the discharge passage in the left-right direction and that inclines to one side in the left-right direction as it moves toward the rear when viewed from above, and a rear guide surface that forms the rear surface of the discharge passage, is connected to the rear end of the side guide surface, and changes the direction of the processed piece flowing rearward along the side guide surface to one side in the left-right direction.

3. A work machine as described in claim 2, wherein the inclination angle in the fore-and-aft direction is greater for the rear guide surface than for the side guide surface.

4. A work machine described in any one of claims 1 to 3, wherein the upper lower guide surface is flat.

5. A work machine described in any one of claims 1 to 3, wherein the lower lower guide surface is flat.

6. A work machine described in any one of claims 1 to 3, wherein both the upper lower guide surface and the lower lower guide surface are flat.

7. An output shaft driven by the power of a prime mover; a circular saw blade held at one end of the output shaft in the axial direction; A saw cover that covers the circular saw blade; a discharge passage provided in the saw cover, arranged radially outward of the circular saw blade, having a discharge port open to one side in the axial direction, and discharging workpieces flowing rearward inside the saw cover during machining from the discharge port; Equipped with The discharge path is an inlet portion formed at a front end portion of the discharge passage and communicating an inside of the saw cover with an inside of the discharge passage; a side guide surface that configures a side surface on the other side of the discharge passage in the axial direction and is inclined toward one side in the axial direction as it approaches the rear side when viewed from above; a rear guide surface that constitutes a rear surface of the discharge passage, that is connected to a rear end of the side guide surface, and that changes the direction of the workpiece flowing rearward along the side guide surface to one side in the axial direction; a lower guide surface that constitutes a lower surface of the discharge passage, that is disposed adjacent to the side guide surface and the rear guide surface, and that is inclined downward as it proceeds toward one side in the axial direction as viewed from the front-rear direction; The present invention relates to a method for manufacturing a computer-implemented ... The lower guide surface is an upper lower guide surface constituting an upper portion of the lower guide surface; a lower lower guide surface constituting a lower portion of the lower guide surface; It is composed of A work machine, wherein an inclination angle of the upper lower guide surface with respect to the vertical direction is set smaller than an inclination angle of the lower lower guide surface with respect to the vertical direction.

8. A work machine as described in Claim 7, wherein the rear guide surface, when viewed from above, inclines toward the rear as it approaches one side in the axial direction.

9. A work machine as described in claim 7, wherein the inclination angle of the rear guide surface relative to the fore-and-aft direction when viewed from above is set to be larger than the inclination angle of the side guide surface relative to the fore-and-aft direction.

10. A work machine as described in claim 7, wherein the vertical width of the upper lower guide surface is set to become larger toward the rear when viewed from one side in the axial direction.

11. A work machine described in any one of claims 7 to 10, wherein the discharge outlet, when viewed from the axial direction, is inclined downward as it approaches the rear.

12. A work machine as described in claim 2 or claim 7, wherein the inclination angle of the side guide surface relative to the fore-and-aft direction is 10 degrees or more and 50 degrees or less.

13. A work machine as described in claim 3 or claim 9, wherein the difference in inclination angle between the side guide surface and the rear guide surface is less than 60 degrees.

Images