JP7229885B2 - work machine - Google Patents

Description

The technology disclosed in this specification relates to a working machine.

Patent Document 1 discloses an operation rod to which a loop handle can be attached, a tool provided in the front part of the operation rod, a motor for driving the tool, a rear housing provided in the rear part of the operation rod, and a A work machine is disclosed that includes a controller that is housed therein and that controls the operation of the motor. A power connector is located at the rear of the rear housing.

Patent Document 2 discloses an operation rod to which a U-shaped handle can be attached, a tool provided in the front part of the operation rod, a motor for driving the tool, a rear housing provided in the rear part of the operation rod, and a rear part. A work machine is disclosed that is housed in a housing and includes a controller that controls the operation of the motor.

Japanese translation of PCT publication No. 2013-524801 JP 2011-239789 A

A work machine having an operation rod may use a loop handle disclosed in Patent Document 1 or a U-shaped handle disclosed in Patent Document 2. When a loop handle is used, the operator holds the loop handle with one hand and the grip provided on the operating rod, rear housing, or the like with the other hand. On the other hand, if a U-shaped handle is used, the operator grasps one side of the U with one hand and the other side of the U with the other hand. In this way, the positional relationship between the worker and the work machine during work differs between when the loop handle is used and when the U-shaped handle is used. Therefore, it is desirable to change the layout of the power wiring connected to the rear housing according to the type of handle attached to the operating rod. That is, it is desired to change the position of the power connector in the rear housing according to the type of handle attached to the operating rod. If the position of the power connector in the rear housing is changed according to the type of handle attached to the operating rod, the shape of the rear housing will change greatly. However, it is desirable that the shape of the rear housing be the same even if the type of handle attached to the operating rod is different.

The present specification provides a technique capable of increasing the number of common parts of the rear housing in a work machine in which two or more types of handles can be attached to an operating rod.

This specification discloses a working machine having an operating rod. The work machine includes an operation rod to which a first type handle that is a U-shaped handle or a second type handle that is a loop handle can be attached, a tool provided in front of the operation rod, and the tool. a motor for driving a motor; a rear housing provided at the rear of the operation rod; a front placement space in which a power connector to which power is supplied from an external power source can be placed; and a rear placement space in the rear of the rear housing in which the power connector can be placed; In the rear housing, when the first type handle is attached to the operation rod, the power connector is arranged in the front arrangement space, and the power connector is not arranged in the rear arrangement space. When the second type handle is attached to the operation rod, the power connector is arranged in the rear arrangement space and the power connector is not arranged in the front arrangement space. .

According to the above configuration, depending on whether the first type handle is attached to the operation rod or the second type handle is attached to the operation rod, the front arrangement space of the rear housing and the rear portion Only the structure of the layout space needs to be changed. Therefore, the parts other than the front arrangement space and the rear arrangement space of the rear housing are shared. Therefore, many parts of the rear housing can be made common. As a result, in a work machine in which two or more types of handles can be attached to the operating rod, the shape of the rear housing can be made substantially the same.

1 is a perspective view of a bush cutter 102 according to a first embodiment; FIG. 4 is a cross-sectional view of the rear housing 140 in the first embodiment; FIG. It is a perspective view of the bush cutter 202 in 2nd Embodiment. FIG. 11 is a cross-sectional view of a rear housing 240 in the second embodiment; FIG. 2 is a diagram showing an electrical configuration of a brush cutter 102 and a battery B in the first and second embodiments;

The motor is housed in the rear housing, and the motor may be arranged above the front placement space and the rear placement space.

Depending on the type of work machine, it may be advantageous to arrange the motor on the rear side of the operation rod in consideration of the weight balance of the work machine. According to the above configuration, even if the motor is accommodated in the rear housing, many parts of the rear housing can be shared.

The controller may be arranged below the motor and above the front and rear installation spaces.

Power supplied from the power connector is supplied to the motor via the controller. According to the above configuration, it is possible to shorten the length of the power wiring that electrically connects the power connector and the controller and the length of the power wiring that electrically connects the controller and the motor. Therefore, it becomes easy to route the power wiring in the rear housing.

The external power source may be a portable power source.

When the external power supply is a portable power supply, the routing of power wiring that electrically connects the external power supply and the rear housing affects workability. According to the above configuration, workability can be improved, and many parts of the rear housing can be shared.

(First embodiment)
A bush cutter 102 according to the first embodiment will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a perspective view of the brush cutter 102. FIG. FIG. 2 is a cross-sectional view of rear housing 140 of brush cutter 102 . As shown in FIG. 1 , the brush cutter 102 includes a cutting blade unit 120 , an operating rod 130 and a rear housing 140 . In the following description, the longitudinal direction of the operating rod 130 is called the front-rear direction, the vertical direction in FIG. 2 is called the vertical direction, and the direction orthogonal to the front-rear direction and the vertical direction is called the left-right direction.

(Configuration of operation rod 130)
The operating rod 130 has a hollow pipe shape and extends linearly. A cutting blade unit 120 is provided on the front portion 130 a of the operating rod 130 , and a rear housing 140 is provided on the rear portion 130 b of the operating rod 130 . The operating rod 130 connects the cutting blade unit 120 and the rear housing 140 . A transmission shaft 132 is rotatably accommodated inside the operation rod 130 (see FIG. 2).

The operating rod 130 is provided with a U-shaped handle 134 to be gripped by the user. The handle 134 is composed of a right handle 134a and a left handle 134b. A trigger-type start switch 133 is provided on the right handle 134a. Start switch 133 is electrically connected to rear housing 140 via signal wiring SW. The signal wiring SW is routed from the rear housing 140 along the operation rod 130 to the right handle 134a. The start switch 133 is a switch for controlling the operation of a motor 142 (see FIG. 2) inside the rear housing 140, which will be described later. A plurality of wire fixing portions 136 a to 136 d are provided between the handle 134 and the rear housing 140 in the operating rod 130 . The wiring fixing portions 136a and 136c fix the signal wiring SW. The wiring fixing portions 136b and 136d fix the power wiring EW. One end of the power wiring EW is connected to the rear housing 140 . The power wiring EW extends forward from the rear housing 140 along the operating rod 130, bends upward and backward behind the handle 134, and extends rearward. A connector CN is provided at the other end of the power wiring EW. Power wiring extending from an external power source of battery B (see FIG. 5) is connected to connector CN. The battery B of this embodiment is a backpack-type battery that is mounted on a backpack frame that is carried by a worker. Note that the battery B may be of a portable type, and may be fixed to the waist belt of the operator.

(Configuration of cutting blade unit 120)
The cutting blade unit 120 includes a rod fixing portion 122 , a cutting blade fixing portion 124 and a safety cover 128 . A front end portion of an operating rod 130 is inserted into the rod fixing portion 122 . A disk-shaped cutting blade 126 is attached to the cutting blade fixing portion 124 . Specifically, the cutting blade 126 is fixed to a cutting blade shaft (not shown) inside the cutting blade fixing portion 124 . The cutting blade shaft is connected to a transmission shaft 132 inside the operating rod 130 via a gear (not shown) inside the rod fixing portion 122 . The safety cover 128 is provided on the rear side of the rod fixing portion 122 .

(Configuration of Rear Housing 140)
As shown in FIGS. 1 and 2, the rear housing 140 is composed of a front first housing 140a and a rear second housing 140b. A rear portion 130b of the operation rod 130 and signal wiring SW are connected to the first housing 140a. The signal wiring SW is connected below the operating rod 130 . The signal wiring SW is fixed by a wiring fixing portion 160 inside the first housing 140a. The signal wiring SW is electrically connected to the controller 150 via an electric line (not shown).

A motor 142, a reduction gear 146, and a controller 150 are accommodated in the second housing 140b. Motor 142 is a brushless DC motor. The rotation axis L2 of the motor 142 is located above the rotation axis of the transmission shaft 132 of the operation rod 130 (that is, the central axis L1 of the operation rod 130). Motor 142 rotates output shaft 144 . The output shaft 144 is connected to the transmission shaft 132 of the operating rod 130 via a reduction gear 146 .

The controller 150 is electrically connected to the power wiring EW via an electric line (not shown). Therefore, electric power is supplied from the external power supply to the controller 150 by connecting an electric cord extending from the external power supply to the power wiring EW. Controller 150 controls the operation of motor 142 by controlling the power supplied to motor 142 from an external power supply. Controller 150 is provided below motor 142 . Also, the controller 150 is provided above the power wiring EW. The controller 150 drives the motor 142 when the start switch 133 (see FIG. 1) of the right handle 134a of the operating rod 130 is turned on, and stops the motor 142 when the start switch 133 is turned off. . In this embodiment, the stator 142a that is part of the motor 142 and the gear housing 146a that accommodates the reduction gear 146 are connected via the metal plate 152. As shown in FIG. Since the metal plate 152 is made of metal, the stator 142a and the gear housing 146a are short-circuited. With such a configuration, it is possible to reduce electromagnetic noise generated when the motor 142 is operated.

Inside the second housing 140b, there is a front placement space 170a, which is a space in which an electric cord can be placed, at the front of the second housing 140b, and a space in which an electric cord can be placed, at the rear of the second housing 140b. There is a rear placement space 170b. Here, the space in which an electric cord can be arranged means a space in which a space for arranging the wiring fixing portion 162 and the power wiring EW is secured. In the brush cutter 102 of this embodiment, the power wiring EW is arranged in the front arrangement space 170a. Specifically, the power wiring EW passes through an opening 164 provided in the lower front portion of the second housing 140b and is fixed by a wiring fixing portion 162. As shown in FIG.

(Second embodiment)
A bush cutter 202 according to the second embodiment will be described with reference to FIGS. 3 and 4. FIG. FIG. 3 is a perspective view of the brush cutter 202. FIG. FIG. 4 is a cross-sectional view of rear housing 240 of brush cutter 202 . In addition, the same code|symbol is attached|subjected about the structure which is common between embodiments, and description is abbreviate|omitted. In the bush cutter 202 of this embodiment, the type of handle attached to the operating rod 130 is different from the type of handle attached to the operating rod 130 in the first embodiment.

As shown in FIG. 3 , the brush cutter 202 includes a cutting blade unit 120 , an operating rod 130 , a grip 280 and a rear housing 240 .

A loop handle 234 is fixed to the operating rod 130 . The loop handle 234 is in the shape of a hollow pipe, and is formed in a loop shape that bulges upward and laterally from the operating rod 130 .

(Configuration of Grip 280)
A grip 280 is provided between the loop handle 234 of the operating rod 130 and the rear housing 240 . The grip 280 is formed so as to cover the outer circumference of the operating rod 130 . The grip 280 has an activation switch 283 provided on the bottom surface. Start switch 283 is a switch for driving motor 142 (see FIG. 4) in rear housing 240 . A panel portion 282 is provided on the front side of the upper surface of the grip 280 . The panel section 282 is composed of an operation panel and a display panel. The operation panel is provided with operation buttons. The operator can perform operations such as switching between driving and stopping the motor 142 by operating operation buttons on the operation panel. A display panel displays the operating state of the motor 142 .

(Configuration of Rear Housing 240)
As shown in FIGS. 3 and 4, the rear housing 240 is composed of a first housing 240a on the front side and a second housing 240b on the rear side. A grip 280 and an operating rod 130 are connected to the first housing 240a.

A motor 142, a reduction gear 146, and a controller 150 are accommodated in the second housing 240b. The positions where the motor 142, the reduction gear 146, and the controller 150 are arranged are the same as in the first embodiment.

Similar to the second housing 140b of the first embodiment, a front arrangement space 170a and a rear arrangement space 170b exist within the second housing 240b of the present embodiment. In the brush cutter 202 of this embodiment, the power wiring EW is arranged in the rear arrangement space 170b. Specifically, the power wiring EW passes through an opening 264 provided in the rear lower portion of the second housing 240 b and is fixed by the wiring fixing portion 162 .

As described above, in the second housing 140b (see FIG. 2) of the rear housing 140 of the first embodiment and the second housing 240b (see FIG. 4) of the rear housing 240 of the second embodiment, the second housings 140b, 240b Only the structures of the front arrangement space 170a and the rear arrangement space 170b are different. That is, portions other than the front arrangement space 170a and the rear arrangement space 170b of the second housings 140b and 240b are shared. Therefore, many parts of the rear housings 140, 240 can be shared. As a result, in the bush cutters 102, 202 in which two or more types of handles 134, 234 can be attached to the operation rod 130, the shape of the rear housings 140, 240 can be substantially the same.

The effect of sharing many parts of the rear housings 140 and 240 will be described. As a comparative example, a case where the structure of the rear housing used when the U-shaped handle is attached to the operating rod and the rear housing used when the loop handle is attached to the operating rod is significantly different will be described. do. In this case, it is necessary to prepare a mold for manufacturing the rear housing for the U-handle and a mold for manufacturing the rear housing for the loop handle. On the other hand, as shown in the first and second embodiments, when portions other than the front arrangement space 170a and the rear arrangement space 170b of the second housings 140b and 240b are shared, the inside of the mold is , only the molds for the front arrangement space 170a and the rear arrangement space 170b need to be changed. In this case, the cost required to manufacture the mold can be reduced. Also, the time required to switch from manufacturing the rear housing 240 for the loop handle 234 to manufacturing the rear housing 240 for the U-shaped handle 134 can be shortened.

In the bush cutters 102, 202 according to the first and second embodiments, the motor 142 is accommodated in the rear housings 140, 240 as shown in FIGS. According to the above configuration, even if the motor 142 is accommodated in the rear housings 140, 240, many parts of the rear housings 140, 240 can be shared.

In the brush cutters 102 and 202 according to the first and second embodiments, as shown in FIGS. 2 and 4, the controller 150 is located below the motor 142 and is located in the front space 170a and the rear space 170a. It is arranged above the space 170b. Electric power supplied from the power wiring EW is supplied to the motor 142 via the controller 150 . According to the above configuration, the length of the power wiring that electrically connects the power wiring EW and the controller 150 and the length of the power wiring that electrically connects the controller 150 and the motor 142 can be shortened. Therefore, routing of power wiring in the rear housings 140 and 240 is facilitated.

In the bush cutters 102 and 202 according to the first and second embodiments, power is supplied from a backpack-type battery B as shown in FIG. In the case of the backpack-type battery B, the routing of power wiring that electrically connects the backpack-type battery B and the rear housings 140 and 240 affects workability. According to the above configuration, workability can be improved, and many parts of the rear housings 140 and 240 can be shared.

(correspondence relationship)
The power wiring EW within the rear housing 140, 240 is an example of a "power connector." The cutting blade 126 is an example of a "tool."

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

(Modification 1) The "work machine" is not limited to the brush cutters 102 and 202, and may be a work machine having a rod with a tool placed at the tip of the rod, such as a pole hedge trimmer and a pole saw. A "tool" may also be a hedge trimmer, a chainsaw, a cultivator, a rotary mop, or the like.

(Modification 2) An opening 264 may be provided in the rear placement space 170b of the second housing 140b of the first embodiment, and the opening may be sealed with a grommet or the like. In this modification, an opening 164 is provided in the front arrangement space 170a of the second housing 240b of the second embodiment, and the opening is sealed with a grommet or the like. In this modified example, the mold used to manufacture the second housings 140b and 240b can be completely shared.

(Modification 3) The cutting blade unit 120 may include the motor 142 . In this case, a harness or the like that connects the controller 150 and the motor 142 is provided in the operation rod 130 instead of the transmission shaft 132 .

(Modification 4) The motor 142 may be a brushed DC motor, or may be another type of motor such as an AC motor.

The technical elements described in this specification or in the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims as of the filing. In addition, the techniques exemplified in this specification or drawings can simultaneously achieve a plurality of purposes, and achieving one of them has technical utility in itself.

102, 202: brush cutter 120: cutting blade unit 122: rod fixing portion 124: cutting blade fixing portion 126: cutting blade 128: safety cover 130: operation rod 130a: front portion 130b: rear portion 132: transmission shaft 133: start switch 134 : Handle 134a : Right handle 134b : Left handle 136a to 136d : Wiring fixing parts 140, 240 : Rear housings 140a, 240a : First housings 140b, 240b : Second housing 142 : Motor 142a : Stator 144 : Output shaft 146 : Deceleration Gear 146a: Gear housing 150: Controller 152: Metal plates 160, 162: Wiring fixing parts 164, 264: Opening 170a: Front arrangement space 170b: Rear arrangement space 234: Loop handle 280: Grip 282: Panel part 283: Start switch B: Battery CN: Connector EW: Power wiring SW: Signal wiring

Claims (4)

an operation rod to which a first type handle that is a U-shaped handle or a second type handle that is a loop handle can be attached;
a tool provided in front of the operation rod;
a motor for driving the tool;
a rear housing provided at the rear of the operating rod;
a controller housed in the rear housing and controlling operation of the motor;
The rear housing is
a front arrangement space arranged in the front part of the rear housing and capable of arranging a power connector supplied with power from an external power supply;
a rear placement space disposed in the rear of the rear housing and capable of arranging the power connector;
In the rear housing,
when the first type handle is attached to the operation rod, the power connector is arranged in the front arrangement space and the power connector is not arranged in the rear arrangement space,
The work machine, wherein the power connector is arranged in the rear arrangement space and the power connector is not arranged in the front arrangement space when the second type handle is attached to the operation rod. . the motor is housed in the rear housing,
The work machine according to claim 1, wherein the motor is arranged above the front arrangement space and the rear arrangement space. The work machine according to claim 1 or 2, wherein the controller is arranged below the motor and above the front arrangement space and the rear arrangement space. The work machine according to any one of claims 1 to 3, wherein the external power supply is a portable power supply.

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