JP5544143B2 - Battery powered electric brush cutter - Google Patents

Description

  The present invention relates to a battery type electric brush cutter provided with a detachable battery.

  Conventionally, as this type of battery-powered electric brush cutter, for example, as in Patent Documents 1 to 3 below, a motor case that includes a cutting blade at the front end portion of the operation spindle and houses a motor at the rear end portion is used. What is provided is known. In the brush cutter, a battery is provided at the lower rear portion of the motor case, and the battery is configured to be attached and detached along the axial direction of the motor. That is, when the battery is attached, the battery is slid forward and attached, and when the battery is removed, the battery is slid backward. Further, since the battery is heavy, the battery is attached and detached with the brush cutter placed on the ground.

  However, since the operator performs the brush cutting work by being located on the side of the operation spindle, after placing the brush cutter on the ground, it is necessary to go around from the side to the rear to remove and install the battery. Is troublesome.

  In addition, since the battery is located on the lower surface of the motor case, there is an advantage that the battery can be inserted / removed substantially parallel to the ground without lifting the battery high from the ground. Since it becomes work, depending on the worker or depending on the work place, it may be painful to attach and detach a heavy battery.

JP-A-10-56845 JP 2006-311827 A JP 2006-31828 A

  Therefore, the present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a battery-type electric brush cutter capable of easily attaching and detaching a battery.

  The present invention has been made to solve the above-mentioned problems, and the battery-type electric brush cutter according to the present invention is provided with a cutting blade at the front end portion of the operation main shaft, and a motor for driving the cutting blade is a motor. In a battery-type electric brush cutter that is housed in a case and is provided at the rear end of the operation spindle, and a battery is detachably attached to the motor case, a lower side of the motor case is provided from the lower surface of the motor case. A battery support body having a battery support portion that is positioned below the distance and supports the battery from below is provided, and the battery is inserted between the lower surface of the motor case and the battery support portion by sliding in a direction perpendicular to the motor axial direction. It is comprised so that it may do.

  In the brush cutter configured as described above, the battery is mounted on the lower side of the motor case. When the battery is attached, the battery is placed between the lower surface of the motor case and the battery support portion. When removing the battery, slide it in the direction perpendicular to the axial direction of the motor and remove it from the bottom of the motor case and the battery support. . That is, since the axial direction of the motor is the front-rear direction, the battery is inserted and removed along the left-right direction perpendicular to the direction. Generally, the operator is located on the side of the brush cutter, so that the battery can be removed and installed while it is located on the side of the brush cutter without going back to the rear once it has been placed on the ground. Can be. At that time, since the battery is located on the lower side of the motor case, it is not necessary to lift the battery higher than the configuration in which the battery is located on the upper side of the motor case. Simply slide the battery approximately parallel to the ground. Further, if the brush cutter placed on the ground is rotated approximately 90 degrees around the operation spindle, the battery can be inserted and removed between the lower surface of the motor case and the battery support portion in the vertical direction. As described above, the battery can be attached and detached by selecting any one of the two work methods according to the physical strength and work place of the worker.

  In particular, the motor case is preferably configured such that the upper case and the lower case are connected vertically by screwing from the lower case toward the upper case. A conventional motor case has a structure in which left and right half cases are screwed from one to the other and combined in the left-right direction. In this structure, a joining line is formed on the upper surface of the motor case. Therefore, rainwater or the like may enter the inside from the joining line. On the other hand, if the motor case is made to be a vertically connected structure of the upper case and the lower case and is configured to be screwed from the lower case toward the upper case, the joining line is not formed on the upper surface of the motor case. It will be formed on the side surface, and the screw hole will be formed on the lower surface instead of the upper surface of the motor case. Accordingly, it is possible to effectively prevent rainwater and the like from entering the inside.

  Further, the lower case includes a lower case main body positioned on the motor side and a cover body positioned outside the lower case main body, for controlling the motor between the lower case main body and the cover body. It is preferable that the circuit board is disposed. By positioning the circuit board for controlling the motor between the lower case body and the cover body, the circuit board can be placed close to the motor, wiring between the motor and the circuit board is shortened, and wiring work is performed. Will also be easier.

On the other hand, the rod support that covers and supports the outer peripheral surface of the operation spindle is attached to the upper case and the lower case so that the front surface of the upper case and the front surface of the lower case are bridged up and down and connected, it is preferable that the battery support is attached to the rod support member and the lower cases to cross-linked to the longitudinal rods support and the lower case. The rod support that connects the upper case and the lower case up and down is integrated with the lower case back and forth by the battery support, so an extremely strong case structure is obtained and durability against rough handling In addition, since the case structure has high rigidity, the mowing operation itself can be performed stably.

  As described above, there is no need to go around from the side of the brush cutter when attaching and detaching the battery. In addition to the attachment / detachment method of inserting / removing the battery substantially parallel to the ground, the attachment / detachment method of inserting / removing the battery in the vertical direction with the brush cutter rotated approximately 90 degrees around the operation spindle can also be performed. Depending on the physical strength of the person and the work place, any one of the two methods can be selected to easily attach and detach the battery.

The perspective view which shows the brush cutter in one Embodiment of this invention. The longitudinal cross-sectional view which shows the principal part of the brush cutter in the same embodiment. The cross-sectional view which shows the principal part of the brush cutter in the same embodiment. The perspective view which shows the state of the attachment or detachment operation | work of a battery in the brush cutter in the embodiment. The principal part perspective view of the brush cutter in the embodiment. The bottom view which shows the principal part of the brush cutter in the same embodiment. The assembly drawing of the brush cutter in the same embodiment.

  Hereinafter, a battery-type electric brush cutter according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7. As shown in FIGS. 1 and 2, the battery-type electric brush cutter in this embodiment includes a long operation spindle 1, and a cutting blade holder 2 is provided at the front end of the operation spindle 1. A cutting blade (not shown) is attached to the cutting blade holder 2, and a motor case 4 that houses a motor 3 for rotating the cutting blade is provided at the rear end of the operation spindle 1.

  As the cutting blade, a disc-shaped metal tip saw, a nylon cord, or the like is used. Further, a blade cover 5 is provided behind the cutting blade holder 2 to prevent members such as vegetation cut by the cutting blade from scattering to the operator side.

  Further, a U-shaped handle 6 is attached to the rear side of the center of the operation main shaft 1 via an attachment 8. At one end of the handle 6, an operation unit 7 for driving the motor 3 is provided. Further, a belt attachment 9 is attached to the position of the operation main shaft 1 behind the handle 6, and a shoulder belt (not shown) is attached to the belt attachment 9. In use, the shoulder belt is held on the shoulder by the shoulder belt, and the handle 6 is operated with both left and right hands gripped.

  As shown in FIG. 2, the operation main shaft 1 has a pipe shape, and a drive shaft 10 for transmitting the rotational driving force of the motor 3 to the cutting blade is inserted inside the operation main shaft 1. It is connected to the front end portion of the drive shaft 11 via a joint tool 12 and rotates integrally. A fan 13 having a large number of wings is attached to the rear end of the drive shaft 11 of the motor 3.

  As shown in FIGS. 2 and 3, the motor case 4 has an upper case 20 and a lower case 21 that are joined together vertically and is screwed from the lower case 21 to the upper case 20 with screws 22 (see FIG. 3). It is configured to be connected and integrated. The upper case 20 is composed of one member, and the lower case 21 is composed of a lower case body 23 and a cover body 24. The lower case body 23 is screwed to the upper case 20 from the lower side by the screws 22 described above and covers the entire periphery of the motor 3 together with the upper case 20. A cover body 24 is located outside or below the lower case body 23, and the cover body 24 is screwed to the lower case body 23 from the cover body 24 side by screws 25 (see FIGS. 2 and 3). .

  A circuit board 26 for driving and controlling the motor 3 is disposed between the lower case main body 23 and the cover body 24. Specifically, as shown in FIG. 3, the circuit board 26 is attached to the lower surface of the lower case body 23 with screws 27 and installed in a substantially horizontal state, and the cover body 24 covers and conceals it from the outside. The motor case 4 is formed by molding from a resin, and both the upper case 20 and the lower case 21 are formed with the up-down direction as the mold drawing direction.

  A battery 30 for supplying power to the motor 3 is detachably attached to the lower surface of the motor case 4. In the mounted state, the battery 30 is located directly below the motor 3 as shown in FIG. As shown in FIGS. 2 to 4, the battery 30 has a rectangular parallelepiped shape as a whole, and includes a terminal 31 connected to the connection terminal 32 of the motor case 4 on the upper surface thereof. As shown in FIGS. 2 and 5, the connection terminal 32 of the motor case 4 protrudes downward from the lower surface of the motor case 4, and the connection terminal 32 is attached to the lower surface of the lower case body 23. And the hole is formed in the cover body 24, and when the cover body 24 is attached to the lower case main body 23, the connection terminal 32 protrudes downward through the hole of the cover body 24. Wiring (not shown) is provided between the motor 3 and the circuit board 26, and between the circuit board 26 and the connection terminal 32, and electric power is supplied from the battery 30 to the motor 3 via these wirings. Supplied.

  A battery support 40 for supporting the battery 30 from below is provided below the motor case 4. As shown in FIGS. 2 to 5, the battery support 40 includes a front leg 41, a rear leg 42, and a battery support 43 that connects the lower ends of both legs 41, 42 back and forth. When viewed from the side, it is formed in a U-shape with an upper opening as a whole. Both the front leg portion 41 and the rear leg portion 42 have a wall shape having a predetermined area, and the front leg portion 41 is screwed to the rod support 50 described later by a screw 44 shown in FIG. 6 from below. The rear leg 42 is screwed to the lower case 21 of the motor case 4 from below with screws 45 shown in FIG. The battery support portion 43 is substantially plate-shaped, and is positioned a predetermined distance away from the lower surface of the motor case 4, and the battery 30 is placed on the upper surface thereof. That is, a battery insertion opening that opens to the side is formed from the lower surface of the motor case 4 and the U-shaped battery support 40, and the battery 30 extends in a direction perpendicular to the axial direction of the motor 3 from the battery insertion opening. Inserted. Since the axial direction of the motor 3 is the front-rear direction, the battery 30 is inserted and removed between the lower surface of the motor case 4 and the battery support 43 along the left-right direction as shown in FIGS. In the present embodiment, the battery 30 is inserted while sliding along the direction of arrow A from the left side of the brush cutter at the time of mounting, and when removing, the battery 30 is slid along the direction of arrow B and removed. As shown in FIGS. 3 to 5, a protective wall 46 having a predetermined height is provided on the periphery of the battery support portion 43 so as to protrude upward except for a part of the entire circumference (left portion). Has been. That is, the protective wall 46 is formed with a notch 47 on the left side so that the battery 30 can be inserted as shown in FIGS.

  Further, as shown in FIG. 2, a cylindrical receiving portion 28 is provided on the front surface of the motor case 4 so as to protrude forward, and a rear end portion of the operation main shaft 1 has a predetermined length inside the cylindrical receiving portion 28. Is inserted. A rod support 50 is screwed to the front surface of the motor case 4. The rod support 50 covers the cylindrical receiving portion 28 of the motor case 4 from the outside, and is configured to support an outer peripheral surface of a predetermined region on the proximal end side of the operation main shaft 1 on the front side of the cylindrical receiving portion 28. Has been. That is, the rod support 50 supports the base end portion of the operation main shaft 1 together with the cylindrical receiving portion 28 of the motor case 4, and the rod support 50 is screwed to the operation main shaft 1 by a horizontal screw (not shown) and The rod support 50 is firmly attached to the outer peripheral surface of the operation spindle 1 by tightening the C-shaped part 51 cut out in the side with a screw 52 (see FIGS. 2, 4, 5, 6, and 7). It is fixed to. The rod support 50 is configured to be screwed to the upper case 20 and the lower case 21 of the motor case 4, and accordingly, the rod support 50 is attached to the front surface of the upper case 20. The front surface of the lower case 21 is connected by bridging up and down.

  Further, as shown in FIGS. 4 and 5, the rod support 50 is formed with an air intake port 53 that opens forward. Specifically, air intake ports 53 are opened at the left and right positions of the operation main shaft 1, and through holes 54 formed in the motor case 4 (specifically, the lower case 21) are formed as shown in FIG. And communicates with the inside of the motor case 4. As shown in FIGS. 2 and 6, an air discharge port 55 is formed on the lower surface of the motor case 4. The air discharge port 55 is formed in the rear portion of the lower surface of the motor case 4 and is partitioned in the front and back by the leg portion 42 on the rear side of the battery support 40 so that two discharge routes are formed in the front and rear.

  That is, when the fan 13 of the motor 3 rotates, air enters the motor case 4 from the air intake port 53 and is discharged from the air discharge port 55, but a region 55 a on the front side of the air discharge port 55. 2 is located in front of the leg part 42 on the rear side of the battery support 40 as shown in FIG. 2, the air discharged from the area 55 a on the front side of the air discharge port 55 is once in the battery support 40. It is discharged to the outside via the inside. On the other hand, the region 55b on the rear side of the air discharge port 55 is located on the rear side of the leg part 42 on the rear side of the battery support 40 as shown in FIGS. The air discharged from the rear region 55b is discharged directly downward outside without passing through the inside of the battery support 40.

  The brush cutter configured as described above is assembled in an upside down state as shown in FIG. That is, the upper case 20 is arranged so that the inner surface faces upward, the motor 3 is placed thereon, the lower case main body 23 is covered from above, and the lower case main body 23 side is directed to the upper case 20 side. Screw on. Then, the rod support 50 is attached to the front surface of the upper case 20 and the front surface of the lower case main body 23 by screws from the front. Thereafter, the cover body 24 is placed on the lower case body 23 and screwed from the cover body 24 side. Further, the operation main shaft 1 is inserted into the rod support 50 to connect the drive shaft 11 and the drive shaft 10 of the motor 3. The rod support 50 and the operation spindle 1 are fixed with a horizontal screw (not shown), and the C-shaped portion 51 of the rod support 50 is tightened with a screw 52 to reduce the diameter so as to be in close contact with the operation spindle 1. Thereafter, the battery support 40 is overlapped from above and screwed to the lower surface of the rod support 50 and the lower case 21 (specifically, the lower case body 23).

  In the brush cutter assembled in this manner, as shown in FIG. 2, the battery 30 is located immediately below the motor 3, and the rear end portion of the battery 30 does not protrude rearward from the motor case 4. That is, by arranging the rectangular parallelepiped battery 30 so that the longitudinal direction thereof is the left and right direction, the heavy battery 30 can be disposed forward as compared with the conventional one, and the work of cutting grass or the like can be performed. Excellent in properties.

  When the battery 30 is attached or detached, the brush cutter is placed on the ground in the state shown in FIG. At this time, the lower surface of the battery support 40 comes into contact with the ground, and the battery 30 does not directly contact the ground, so that the battery 30 is protected. In particular, since the protective wall 46 having a predetermined height protrudes from the peripheral edge portion of the battery support portion 43, the lower portion of the battery 30 can be prevented from being damaged or damaged due to contact with a stone or the like on the ground.

  Further, since the notch 47 is formed in the left portion of the protective wall 46, it is not necessary to lift the battery 30 high from the ground, and the battery 30 can be mounted while being slightly lifted from the ground and slid. it can. In addition, since the operator normally works on the left side of the brush cutter, after the brush cutter is placed on the ground, the battery 30 can be attached and detached without going around the brush cutter. It can be carried out.

  Further, when the brush cutter is rotated approximately 90 degrees in the direction of the arrow P from the state shown in FIG. 1 around the axis of the operation spindle 1, the notch 47 of the protective wall 46 is positioned upward, and the battery 30 is removed. Can be inserted / removed in the vertical direction from above. In this way, an operation can be performed by selecting any one of the two types of attachment / detachment methods.

  On the other hand, since the motor case 4 is divided vertically from the upper case 20 and the lower case 21, the joining line S is not formed on the upper surface but formed on the side surface. Therefore, it is possible to prevent rainwater and the like from entering from the joining line S on the upper surface as in the conventional case, and it is possible to suppress failure of the internal motor 3 and the like. Further, since the screws are fixed from the lower case 21 toward the upper case 20, no screw holes are formed on the upper surface. Accordingly, it is possible to prevent rainwater and the like from entering through the screw holes. Moreover, since the screwing direction of the cover body 24 and the screwing direction of the battery support body 40 are also common as shown in FIG. 7, the assembling work is easy.

  Further, since the lower case 21 is composed of the lower case main body 23 and the cover body 24 and the circuit board 26 is positioned between them, the circuit board 26 can be disposed close to the motor 3 and wiring And the wiring work can be easily performed.

  Further, the upper case 20 and the lower case 21 are connected by a rod support 50 so as to be bridged up and down on the front surface of the motor case 4, and the rod support 50 and the lower case 21 are further connected to the battery. Since the support body 40 has a structure in which the support body 40 is connected so as to be cross-linked back and forth, the motor case 4 has high strength, excellent durability, and operability.

  Furthermore, since the air discharge port 55 opens downward, the discharged high-temperature air does not hit the operator. Since a part of the discharged air is guided to the battery 30 side, an excessive temperature rise of the battery 30 can be prevented at the same time.

  In the present embodiment, the notch 47 is formed in the left part of the protective wall 46. However, the battery 30 may be mounted from both the left and right sides by forming a notch in the right part.

  The circuit board 26 may be attached to the inner surface of the cover body 24.

DESCRIPTION OF SYMBOLS 1 Operation spindle 2 Cutting blade holder 3 Motor 4 Motor case 5 Blade cover 6 Handle 7 Operation part 8 Attachment 9 Belt attachment 10 Drive shaft 11 Drive shaft 12 Joint tool 13 Fan 20 Upper case 21 Lower case 22 Screw 23 Lower side Case body 24 Cover body 25 Screw 26 Circuit board 27 Screw 28 Cylindrical receiving part 30 Battery 31 Terminal 32 Connection terminal 40 Battery support 41 Front leg part 42 Rear leg part 43 Battery support part 44 Screw 45 Screw 46 Protective wall 47 Notch 50 Rod support 51 C-shaped part 52 Screw 53 Air inlet 54 Through hole 55 Air outlet 55a Front area 55b Rear area S Joining line

Claims (4)

A battery type in which a cutting blade is provided at the front end of the operation spindle, a motor for driving the cutting blade is housed in a motor case and provided at the rear end of the operation spindle, and a battery is detachably attached to the motor case. In the electric brush cutter of
The lower side of the motor case is provided with a battery support having a battery support part that is located a predetermined distance below the lower surface of the motor case and supports the battery from below.
A battery-type electric brush cutter characterized in that the battery is slid and inserted between a lower surface of the motor case and the battery support portion in a direction perpendicular to the axial direction of the motor.   The battery-type electric brush cutter according to claim 1, wherein the motor case is configured such that an upper case and a lower case are connected to each other by being screwed from the lower case toward the upper case.   The lower case includes a lower case main body positioned on the motor side and a cover body positioned outside the lower case main body, and a circuit for controlling the motor between the lower case main body and the cover body. The battery-powered electric brush cutter according to claim 2, wherein a substrate is disposed. A rod support that covers and supports the outer peripheral surface of the operation spindle is attached to the upper case and the lower case so that the front surface of the upper case and the front surface of the lower case are bridged up and down, and is further connected to the upper case. battery support rod support and the lower battery type electric mowing machine according to claim 2, characterized in that attached to the cases to cross-linked to the longitudinal body and the lower case.

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