JP6454501B2 - Backpack type work machine - Google Patents

Description

  The present invention relates to a backpack-type working machine having a prime mover mounted on a backpack frame.

  A backpack-type work machine is equipped with a prime mover as a power source on the frame for the backpack, and a work part is provided at the tip of the operation rod that the operator holds by hand, and the work part is moved from the prime mover to the work part via a flexible shaft. It transmits power. An example of such a backpack-type working machine is a mower that performs operations such as mowing, pruning, and pruning. The mower has a working unit that rotationally drives a working tool such as a cutting blade or a resin string at the tip of the operating rod.

  In order to transmit power from the prime mover located on the back side of the operator to the working part of the operating rod located on the near side of the operator, such a backpack type work machine has a flexible shaft bent in a U shape. Yes. At this time, the operator performs the work while holding the operating rod while resisting the repulsive force of the flexible shaft in the bent state, and the repulsive force received by the worker changes when the bent state of the flexible shaft changes. As a result, good workability cannot be obtained. On the other hand, in the past, the prime mover was rotatably mounted around the vertical axis provided on the back frame, and the prime mover was rotated around the vertical axis in response to work movements where the operating rod was swung back and forth and left and right. The change of the bending state of the shaft is suppressed (see Patent Document 1 below).

Japanese Patent Laid-Open No. 54-4722

  When mowing, etc., with such a backpack-type work machine, the work surface is substantially horizontal, while the worker performing the standing work keeps the operating rod inclined with respect to the work surface. Then, the work part is shaken back and forth and right and left along the work surface. At this time, in the conventional backpack type work machine, the output shaft of the prime mover is arranged substantially horizontally, and power is transmitted from the output shaft to the flexible shaft, so that it is inclined with respect to the substantially horizontal work surface. The reaction force of the movement of swinging the retained operating rod back and forth and left and right acts obliquely with respect to the output shaft of the prime mover, causing the output shaft of the prime mover to swing up and down. As a result, the prime mover in an unsupported state swings in an unstable manner, and there is a problem in that an operator feels uncomfortable on the back.

  This invention makes it an example of a subject to cope with such a problem. In other words, a work machine equipped with a prime mover on the back frame, a working part provided at the tip of an operating rod that the worker holds by hand, and power is transmitted from the prime mover to the working part via a flexible shaft. In the present invention, it is an object of the present invention that, when performing an operation of holding the operating rod in a state inclined with respect to the work surface, the operator can perform the operation without obtaining an uncomfortable backpack.

In order to achieve such an object, a backpack-type working machine according to the present invention has the following configuration.
A working machine in which a prime mover is mounted on a back frame, and the power of the prime mover is transmitted via a flexible shaft to a working part provided at a tip part of the operating stick, and an operator carrying the frame carries the operating stick. In a shoulder-type work machine that is held while being tilted with respect to a work surface, the prime mover is statically attached to the frame such that an output shaft is directed up and down and an upper side of the output shaft is inclined toward an operator. attached to the proximal end of the flexible shaft is rotatably connected around of the output shaft at an upper side of the output shaft, said flexible shaft extending to the rear of the operator from the proximal end to the operating rod is curved towards, knapsack working machine, characterized in that it is inclined plane formed by the rotation of the proximal end relative to the working surface of the working portion.

It is explanatory drawing which showed the whole structure of the backpack type working machine which concerns on one Embodiment of this invention. It is explanatory drawing (partial sectional drawing) which showed a part (a frame and a motor | power_engine) of the backpack type working machine which concerns on one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing the overall configuration of a backpack-type working machine according to an embodiment of the present invention. The backpack-type working machine 1 includes a backpack frame 2, a prime mover 3 mounted on the frame 2, a flexible shaft 4, an operating rod 5, and a working unit 6. Such a shoulder-type working machine 1 transmits the power of the prime mover 3 to the working part 6 provided at the distal end part of the operating rod 5 via the flexible shaft 4, and the base end part 4A of the flexible shaft 4 is the prime mover. The front end 4B of the flexible shaft 4 is connected to a power transmission means provided in the operating rod 5. Here, the output shaft includes a crankshaft when the prime mover 3 is an engine, a rotor shaft when the prime mover 3 is an electric motor, and a shaft from which power is transmitted.

  In the shoulder-type work machine 1 according to the embodiment of the present invention, the base end portion 4 </ b> A of the flexible shaft 4 is rotatably connected around the output shaft of the prime mover 3. The surface formed by the rotation of the base end portion 4 </ b> A of the flexible shaft 4 is inclined with respect to the working surface of the working portion 6. Thus, by making the base end portion 4A of the flexible shaft 4 rotatable in a plane inclined with respect to the work surface, the operator holds and operates the operation rod 5 in a state inclined with respect to the work surface. When performing the work operation of swinging the rod 5 back and forth and back and forth, the base end portion 4A of the flexible shaft 4 rotates on a certain surface according to the work operation, and the output shaft of the prime mover 3 and the prime mover 3 itself are shaken. Work can be done without moving. As a result, the worker can perform work while obtaining a stable backpack feeling.

  The surface formed by the rotation of the base end portion 4 </ b> A of the flexible shaft 4 is preferably a constant surface along the working posture of the operation rod 5. As a result, the bending reaction force of the flexible shaft 4 generated by the work operation of shaking the operating rod 5 is absorbed by the rotation of the base end portion 4A within a certain plane, and the swing of the output shaft of the prime mover 3 and the prime mover 3 itself. Can be suppressed.

  By inclining the output shaft of the prime mover 3 to which the base end portion 4A of the flexible shaft 4 is connected with respect to the axis orthogonal to the work surface, the surface on which the base end portion 4A of the flexible shaft 4 rotates is relative to the work surface. Can be tilted. At this time, the inclination angle θ of the output shaft (inclination angle with respect to the axis orthogonal to the work surface) θ is preferably θ = θ1 ± 20 °, where θ1 is an angle formed between the operating rod 5 and the work surface. The angle θ1 formed by the operating rod 5 and the work surface is set to 25 ° to 40 ° when the work surface is set to a horizontal plane.

  In the illustrated example, the base end portion 4A of the flexible shaft 4 is rotatably connected around the output shaft, and the base end portion 4A of the flexible shaft 4 is connected orthogonally to the output shaft. In this way, by connecting the base end portion 4A of the flexible shaft 4 so as to be rotatable around the output shaft, the bending state of the flexible shaft 4 can be greatly changed even when the prime mover 3 is fixed to the frame 2. The operation rod 5 can be swung back and forth, and left and right, and the base end 4A of the flexible shaft 4 is connected perpendicularly to the output shaft, so that the output is generated by the reaction force of the curved flexible shaft 4. It is possible to prevent the shaft from swinging.

  The connection position between the base end portion 4A of the flexible shaft 4 and the output shaft is preferably above the center of gravity of the prime mover 3, and preferably on the center of gravity of the prime mover 3 or on the operator side from the center of gravity. Thus, by setting the connection position between the base end portion 4A of the flexible shaft 4 and the output shaft, the working position of the force applied to the output shaft or the prime mover 3 during work can be brought closer to the operator side, and the work operation It is possible to suppress an increase in the burden caused by the load.

  The embodiment of the present invention shown in FIG. 1 and FIG. 2 will be specifically described below. The illustrated backpack-type work machine 1 is configured such that the prime mover 3 is statically attached to the frame 2 so that the output shaft connecting the base end portion 4A of the flexible shaft 4 is inclined upward, and further the flexible shaft 4 The base end portion 4A is connected to be rotatable around the output shaft. By attaching the prime mover 3 to the frame 2 in this manner in a static manner, there is a sense of incongruity due to the rotation of the prime mover accompanying the work operation of shaking the operating rod 5 and discomfort due to transmission of the swing of the prime mover to the operator. Can be resolved. Moreover, since the motor | power_engine 3 can be attached to the flame | frame 2 closely, a worker's back load can be reduced. Further, as described above, since the output shaft to which the base end portion 4A of the flexible shaft 4 is connected is inclined, the uncomfortable backpack feeling caused by the vertical movement of the frame by the operation operation of shaking the operation rod 5 is eliminated. Can do.

  In the illustrated example, the frame 2 includes a horizontal frame 2A and a vertical frame 2B that are orthogonal to each other, and a backpack 20, a back belt 21, or a torso belt 22 on which the operator carries the frame 2 on the vertical frame 2B. Has been. In the illustrated example, a tool storage bag 23 is provided above the vertical frame 2B.

  The prime mover 3 is, for example, a battery-driven electric motor or an engine, and a base end portion 4A of the flexible shaft 4 is connected to a power shaft or an output shaft connected to the power shaft by a gear train or the like. The operating rod 5 is provided with a handle 50 that is held by a worker by hand, and further provided with an operating lever 51 for operating, stopping, and adjusting output of the prime mover 3.

  The working unit 6 includes a rotating body 60 that rotates with a driving force transmitted from the prime mover 3 when the backpack-type working machine 1 is used as a brush cutter, and the rotating body 60 includes a cutting blade and a resin. A string (nylon cord) is attached. The form of the working unit 6 is not limited to this, and may include an operating body that reciprocates by a driving force transmitted from the prime mover 3. A safety cover 61 is provided on the front side of the working unit 6.

  In the illustrated example, the prime mover 3 is statically attached to the frame 2. Here, the static mounting includes fixing the motor 3 to the frame 2 and mounting the motor 3 so as to allow some movement, and mounting the motor 3 so as not to cause a large movement such as rotation around an axis. Pointing. In the illustrated example, the prime mover 3 is attached to the frame 2 via a vibration damper (suspension member) 7.

  The prime mover 3 is statically attached to the frame 2 so that the output shaft to which the base end portion 4A of the flexible shaft 4 is connected faces upward. As described above, the output shaft to which the base end portion 4A of the flexible shaft 4 is connected may be a power shaft of the prime mover 3 or may be a shaft connected to the power shaft by a gear train or the like. . In the illustrated example, the base end portion 4A of the flexible shaft 4 is connected to be rotatable around the output shaft within a plane along the working posture of the operating rod 5.

The base end portion 4A of the flexible shaft 4 is connected so as to rotate in the axial direction around the axial direction P1 along the output shaft, and the base end portion 4A rotates in a plane perpendicular to the axial direction P1. By tilting the axial direction P1 by an angle θ with respect to the direction P2 orthogonal to the work surface, the surface on which the base end portion 4A rotates (surface orthogonal to the axial direction P1) is tilted with respect to the work surface. Yes. Here, the direction P2 perpendicular to the work surface is a direction perpendicular to the axis P3 along the work surface, and when the work surface is a horizontal surface, the direction P2 is a direction along the vertical frame 2B. It refers to a direction oriented perpendicularly 2 with state Tsu backpack into normal.

  In this example, since the prime mover 3 is statically attached to the frame 2, it is possible to eliminate the uncomfortable feeling that the prime mover rotates and the uncomfortable feeling caused by the swing of the prime mover every time the operation rod 5 is swung back and forth and left and right. By attaching the prime mover 3 to the frame 2 via the vibration damper 7, it is possible to further eliminate discomfort due to the vibration of the prime mover 3.

  And since the axial direction of the base end part 4A of the flexible shaft 4 is rotatably connected around the axial direction P1 of the output shaft directed upward, the flexible shaft accompanying the work operation of swinging the operating rod 5 back and forth and left and right 4 can be suppressed by rotating the base end portion 4A around the axial direction P1, and even if the prime mover 3 is statically attached to the frame 2, the curved flexible shaft 4 can be suppressed. The work operation of swinging the operation rod 5 back and forth and right and left can be performed without greatly changing the repulsive force.

  Further, since the base end portion 4A of the flexible shaft 4 rotates in a plane along the working posture of the operating rod 5, the change in the bending state of the flexible shaft 4 accompanying the work operation of swinging the operating rod 5 back and forth and left and right is determined. It can be stably suppressed by the rotation of 4A. As a result, a comfortable workability can be obtained without causing an uncomfortable carrying feeling that the frame 2 moves up and down by the work operation of the operating rod 5.

  In the example shown in the drawing, the inclination angle θ of the output shaft axial direction P1 with respect to the axial direction P2 is defined as θ1 being an angle formed between the axis P3 along the work surface of the working unit 6 (rotating body 60) and the operating rod 5. θ is set to θ1. By setting the inclination angle θ in this way, the posture direction of the operating rod 5 can be made substantially orthogonal to the axial direction P1 in a work posture in which the axis P3 along the work surface is along the ground. . According to this, the operation | movement operation | movement which shakes the operating rod 5 back and forth and right and left will be performed in the surface substantially orthogonal to the axial direction P1, and the bending state change of the flexible shaft 4 can be suppressed more stably.

  FIG. 2 shows an example of the mounting state of the prime mover 3 mounted on the frame 2 (the same parts as those described in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted). In the illustrated example, the prime mover 3 is attached to the frame 2 in an inclined state, and the power shaft 3A of the prime mover 3 is inclined upward along the axial direction P1 described above. In order to attach the prime mover 3 in an inclined state, brackets 24 and 25 having attachment surfaces orthogonal to the horizontal frame 2A and the vertical frame 2B are attached, and the prime mover 3 is attached to the attachment surfaces via the vibration dampers 7. It is attached. The base end portion 4A of the flexible shaft 4 is connected to the power shaft 3A of the prime mover 3 via a pair of bevel gears 40 and 41. Thereby, the axial direction of the base end portion 4A of the flexible shaft 4 is rotatable around the axis P1.

  When the prime mover 3 is attached to the frame 2 in such a manner that the power shaft 3A of the prime mover 3 is inclined with respect to the vertical reference axis P2 of the frame 2, a triangular space is formed between the prime mover 3 and the frame 2. A space S is formed. Since this empty space S is formed at a position close to the operator's back, even if a heavy object is placed there, the load on the back will not increase greatly. When the prime mover 3 is a battery-driven electric motor, the empty space S can be used to place the heavy battery 30. Further, when the prime mover 3 is an engine, a heavy fuel tank 30T can be arranged using this empty space.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention.

1: Back working machine, 2: Frame, 2A: Horizontal frame, 2B: Vertical frame,
3: prime mover, 3A: power shaft,
4: Flexible shaft, 4A: Base end, 4B: Front end,
40, 41: bevel gear,
5: Operation rod, 50: Handle, 51: Operation lever,
6: working part, 60: rotating body, 7: vibration buffer (suspension member),
20: shoulder pad, 21: shoulder belt, 22: torso belt,
23: Tool storage bag, 30: Battery, 30T: Fuel tank

Claims (10)

A working machine in which a prime mover is mounted on a back frame, and the power of the prime mover is transmitted via a flexible shaft to a working part provided at a tip part of the operating stick, and an operator carrying the frame carries the operating stick. In a shoulder-type work machine that works while being held inclined with respect to the work surface ,
The prime mover is statically attached to the frame such that the output shaft is directed up and down, and the upper side of the output shaft is inclined toward the operator side,
The base end portion of the flexible shaft is rotatably connected around the output shaft above the output shaft ,
It said flexible shaft extending to the rear of the operator from the proximal end is bent toward the operating rod, that the plane formed by the rotation of the proximal end portion is inclined with respect to the working surface of the working portion A backpack-type work machine characterized by   The backpack-type working machine according to claim 1, wherein a surface formed by the rotation of the base end portion is a constant surface along a working posture of the operating rod.   3. The surface formed by the rotation of the base end portion is inclined with respect to the work surface when the output shaft is inclined with respect to an axis orthogonal to the work surface. Backpack type work machine.   The inclination angle θ of the output shaft with respect to an axis orthogonal to the work surface is θ = θ1 ± 20 °, where θ1 is an angle formed by the operating rod and the work surface. Backpack type work machine.   The backpack-type work machine according to claim 4, wherein an angle θ1 formed by the operating rod and the work surface is 25 ° to 40 °.   The backpack type work machine according to any one of claims 1 to 5, wherein the base end portion is connected orthogonally to the output shaft.   The shoulder working machine according to any one of claims 1 to 6, wherein a connection position between the base end and the output shaft is above a center of gravity of the prime mover.   The shoulder-type work machine according to any one of claims 1 to 6, wherein a connection position between the base end part and the output shaft is on a center of gravity of the prime mover or on an operator side with respect to the center of gravity.   The backpack type working machine according to any one of claims 1 to 8, wherein the prime mover is an electric motor driven by a battery mounted on the frame.   The shoulder working machine according to any one of claims 1 to 8, wherein the prime mover is an engine.

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