JP5317660B2 - Backpack type work machine - Google Patents

Description

  The present invention relates to a backpack-type working machine.

  2. Description of the Related Art Conventionally, for example, a backpack type blower is known as a backpack type work machine in which a work machine body having an engine is supported by a frame that can be carried on the back (for example, Patent Document 1).

  The back blower of Patent Document 1 includes a blower body as a work machine body, a wind pipe connected to the blower body, a frame that supports the blower body, a vibration isolating rubber provided between the blower body and the frame, a fuel With a tank. The blower body includes an engine, a fan driven by the engine, and a volute case to which the engine is attached and which houses the fan. The frame includes a vertical backrest portion and a horizontal pedestal portion, and is formed in an L shape in cross section. An anti-vibration spring is provided between the backrest and the blower body. A fuel tank is provided under the engine on the gantry. Two anti-vibration rubbers are provided between the gantry and the lower side of the volute case.

  The vibration-proof rubber supports the blower body at three points together with the vibration-proof spring while being compressed by the weight of the blower body. In the blower of Patent Document 1, vibration transmitted from the blower body to the frame can be attenuated by the vibration-proof rubber and the vibration-proof spring. Further, in the blower of Patent Document 1, the vibration isolating rubber attenuates the vibration while expanding and contracting vertically with respect to the vertical vibration from the blower main body, so that the blower main body is supported in a stable posture without being tilted. Can be damped.

JP 2008-637779 A

  However, in the blower of Patent Document 1, since the vibration isolating rubber supports the blower main body by being compressed, the spring constant of the vibration isolating rubber must be set high so that the vibration isolating rubber does not fully compress. The damping performance of the anti-vibration rubber will be low. Therefore, in the blower disclosed in Patent Document 1, there is sufficient space between the fuel tank and the engine to prevent the blower body from moving up and down and contacting the fuel tank on the frame when an impact is applied. Or a rubber member for preventing contact must be provided on the fuel tank, and there is a problem that it is not possible to reduce the size or reduce the number of members. In addition, as a member provided in the gantry for supporting the blower body, a vibration isolation spring may be used instead of the vibration isolation rubber. Even in such a case, the vibration isolation spring is compressed to blow the blower. Since the main body is supported, there is still a problem that the attenuation performance is lowered.

  An object of the present invention is to provide a backpack-type working machine capable of improving damping performance.

A backpack type work machine according to claim 1 of the present invention includes a work machine main body having an engine, a back support part, and a frame part that supports the work machine main body, and is formed in an L shape in a side view. And an anti-vibration member that connects the work implement main body and the gantry unit, and the anti-vibration member includes a fixing unit fixed to the gantry unit, and a lower portion than the fixing unit from the work implement main unit. An extending portion, a portion below the fixed portion in the extending portion, and an elastic member connecting the fixed portion; and a portion below the fixed portion in the extending portion, A receiving portion that is arranged in parallel with the gantry and to which one end of the elastic member is fixed is provided. The gantry is provided with a case portion that protrudes upward from the gantry, and an upper surface portion of the case portion. Is the fixed part, and the upper surface part has Is insertion hole formed Kinobe out portion is inserted, the receiving portion and the elastic member may be housed within the case unit.

The backpack-type working machine according to claim 2 of the present invention is the backpack-type working machine according to claim 1, wherein the extension portion is disposed in a portion below the fixed portion in parallel with the gantry portion, A receiving portion to which one end of the elastic member is fixed is formed, and a stopper portion that contacts the receiving portion when the elastic member expands a predetermined amount is provided below the receiving portion. To do.

A backpack type work machine according to claim 3 of the present invention includes a work machine main body having an engine, a back rest, and a gantry for supporting the work machine main body, and a frame formed in an L shape in side view. And an anti-vibration member that connects the work implement main body and the gantry unit, and the anti-vibration member includes a fixing unit fixed to the gantry unit, and a lower portion than the fixing unit from the work implement main unit. An extending portion, a portion below the fixed portion in the extending portion, and an elastic member connecting the fixed portion; and a portion below the fixed portion in the extending portion, A receiving portion that is arranged in parallel with the pedestal portion and to which one end of the elastic member is fixed is formed. A stopper portion that contacts the receiving portion when the elastic member is extended by a predetermined amount is formed below the receiving portion. Is provided.

According to the first aspect of the present invention, since the extending portion extending from the work implement main body and the fixed portion fixed to the gantry portion are connected by the elastic member, the vertical vibration of the work implement main body is elastically elastic. It can be attenuated by the member.
Moreover, since one end is connected with the fixing | fixed part and the other end is connected with the part below the fixing | fixed part in the extension part, an elastic member can support a working machine main body by tension | pulling. Therefore, the spring constant of the elastic member can be set low compared with the case where the elastic member supports the work machine main body by compression, and the damping performance can be improved.
Furthermore, since the receiving part provided in parallel with the gantry part is accommodated in the case part, the receiving part comes into contact with the inner wall of the case part when the working machine main body is inclined at a predetermined angle. Therefore, it is possible to prevent the work implement main body from being inclined more than a predetermined angle.

According to the invention of claim 2 , since the stopper portion is provided below the receiving portion, the receiving portion comes into contact with the stopper portion when the work implement main body is displaced downward by a predetermined amount or more. Therefore, it is possible to prevent the work implement main body from being displaced downward by a predetermined amount or more, and to reliably prevent the engine from coming into contact with the fuel tank provided on the gantry.

According to the invention of claim 3, since the extending portion extending from the work implement main body and the fixed portion fixed to the gantry are connected by the elastic member, the vertical vibration of the work implement main body is elastically elastic. It can be attenuated by the member.
Moreover, since one end is connected with the fixing | fixed part and the other end is connected with the part below the fixing | fixed part in the extension part, an elastic member can support a working machine main body by tension | pulling. Therefore, the spring constant of the elastic member can be set low compared with the case where the elastic member supports the work machine main body by compression, and the damping performance can be improved.
Further, since the stopper portion is provided below the receiving portion , the receiving portion comes into contact with the stopper portion when the working machine body is displaced downward by a predetermined amount or more. Therefore, it is possible to prevent the work implement main body from being displaced downward by a predetermined amount or more, and to reliably prevent the engine from coming into contact with the fuel tank provided on the gantry.

[First Embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a side view showing a shoulder-type blower 1 as a shoulder-type working machine according to the present embodiment.
As shown in FIG. 1, the shoulder blower 1 includes a blower body 2 as a work machine body, a wind pipe (not shown) connected to the blower body 2, a frame 3 that supports the blower body 2, a blower body 2, and Two anti-vibration members 4 (only one is shown in FIG. 1) for connecting the frame 3 are provided.

  The blower body 2 includes an engine 21, a fan (not shown) driven by the engine 21, a volute case 22 in which the engine 21 is attached to the back side (right side in FIG. 1) and accommodates the fan, and a fuel tank 23. ing. An insertion hole 221 (see FIG. 3) into which the vibration isolating member 4 is inserted is formed at each position where the vibration isolating member 4 is attached below the volute case 22. A single fixing groove 223 (see FIG. 3) for fixing the vibration isolating member 4 to the volute case 22 is formed on the inner peripheral surface 222 of the insertion hole 221. In such a blower body 2, when the fan is driven by the engine 21 and the pumped air is generated by the fan, the pumped air is sent from the volute case 22 to the wind pipe connected to the volute case 22. It will be ejected from the tube.

  The frame 3 includes a back pad 31 that is attached to the user's back with a shoulder belt attached thereto, and a pedestal 32 that extends from the lower end of the back pad 31 in a direction perpendicular to the back pad 31, as viewed from the side. It is formed in an L shape. An anti-vibration spring 5 is provided between the back pad 31 and the volute case 22. A fuel tank 23 is provided below the engine 21 on the gantry 32. Furthermore, a vibration isolating member 4 is provided between the gantry 32 and the lower side of the volute case 22. In the gantry part 32, a stopper part 321 (see FIG. 3) recessed from the periphery is formed at each position where the vibration isolation member 4 is provided.

  Two anti-vibration members 4 are provided between the gantry portion 32 and the lower side of the volute case 22, and the anti-vibration members 4 are provided so as to be inclined inward. In the present embodiment, the two vibration isolating members 4 and the vibration isolating spring 5 support the blower body 2 with respect to the frame 3 at three points and attenuate vibrations transmitted from the blower body 2 to the frame 3. To do.

FIG. 2 is a perspective view showing the vibration isolation member 4, and FIG. 3 is a cross-sectional view showing the vibration isolation member 4.
As shown in FIGS. 2 and 3, the vibration isolation member 4 includes a case member 41 as a case portion, an extension member 42 as an extension portion, and a rubber member 43 as an elastic member.

  The case member 41 is formed in a box shape whose lower side is open, and protrudes upward from the gantry 32. Such a case member 41 includes a cylindrical portion 411, a flange portion 412 that is provided around the stopper portion 321 of the pedestal portion 32 with a bolt 44 and a nut 45, and an upper end of the cylindrical portion 411. And an upper surface portion 413 that closes the side. An insertion hole 4131 through which the extending member 42 is inserted is formed in the upper surface portion 413. In the present embodiment, the upper surface portion 413 is fixed to the gantry portion 32 and serves as a fixing portion to which one end of a rubber member 43 described later is fixed.

The extending member 42 includes a mounting portion 421, a hanging portion 422, and a receiving portion 423.
The attachment portion 421 is a member for attaching the extending member 42 to the volute case 22, is formed in a disk shape, and is inserted into the fixing groove 223 of the volute case 22, so that the extending member 42 is attached to the volute case 22. And fix.

The hanging part 422 hangs from the attachment part 421 and extends to the inside of the case member 41 through the insertion hole 4131.
The receiving part 423 is formed in a disc shape and is attached to the lower end of the hanging part 422. The receiving portion 423 is disposed between the upper surface portion 413 and the gantry portion 32 and is disposed to face the upper surface portion 413. In addition, the receiving portion 423 is disposed above the stopper portion 321 by a predetermined distance in a state where the load of the blower body 2 is applied to the rubber member 43.

  The rubber member 43 is formed in a cylindrical shape, and upper and lower end surfaces are fixed to the upper surface portion 413 and the receiving portion 423, respectively, thereby connecting the upper surface portion 413 and the receiving portion 423. In the present embodiment, the rubber member 43 expands and contracts to attenuate the vertical vibration of the blower body 2. The rubber member 43 not only vibrates in the vertical direction of the blower body 2 but also vibrates in the horizontal direction, rotation direction (twisting direction), and twist direction (rotation direction around the extending member 42) of the blower body 2. Can also be attenuated.

  In this embodiment, such a rubber member 43 supports the blower body 2 by pulling. Therefore, as compared with the conventional case where the rubber member supports the blower body 2 by compression, the spring constant of the rubber member 43 can be set low, and the damping performance can be improved.

FIG. 4 is a cross-sectional view showing the vibration isolating member 4 when the blower body 2 has a large downward displacement.
In the present embodiment, as described above, the stopper portion 321 is provided below the receiving portion 423 by a predetermined distance. Therefore, as shown in FIG. 4, when the displacement of the blower body 2 is large, the receiving portion 423 comes into contact with the stopper portion 321, so that the blower body 2 is displaced downward by a predetermined amount or more. Can be prevented. Therefore, the engine 21 can be reliably prevented from coming into contact with the fuel tank 23 provided on the gantry 32. Further, it is possible to prevent the rubber member 43 from being excessively displaced.

FIG. 5 is a cross-sectional view showing the vibration isolating member 4 when the displacement of the blower body 2 in the rotation direction is large.
Furthermore, in this embodiment, the receiving part 423 is accommodated in the case member 41. Therefore, as shown in FIG. 5, when the blower body 2 is tilted by a predetermined angle, the receiving portion 423 comes into contact with the cylindrical portion 411, so that the blower body 2 is prevented from being tilted by a predetermined angle or more. be able to.

[Second Embodiment]
FIG. 6 is a sectional view showing a vibration isolating member 4A according to the second embodiment of the present invention. Henceforth, the same code | symbol is attached | subjected to the same functional part as the said 1st Embodiment, and those description is abbreviate | omitted or simplified.
The present embodiment is characterized in that a spring 46 is used instead of the rubber member 43 as an elastic member that connects the upper surface portion 413 and the receiving portion 423 of the case member 41. Since this embodiment also has the same configuration as that of the above-described embodiment, the same effect can be achieved.

[Modification of Embodiment]
Note that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope in which the object of the present invention can be achieved are included in the present invention.
In each of the above embodiments, the elastic member is the rubber member 43 or the spring 46. However, the elastic member may be any member as long as it has elasticity, for example, an appropriate resin having elasticity. There may be.

  In the second embodiment, the spring 46 has one end fixed to the receiving portion 423, but the spring is formed to have a diameter that decreases, for example, downward, and one end is fixed to the lower end of the hanging part 422. As long as the fixed part and the extension part are connected by pulling, both ends may be fixed to the fixed part and the extension part in any way.

In each of the above embodiments, the blower body 2 is supported by the two vibration isolation members 4 and 4A. However, the blower body 2 may be supported by only one vibration isolation member, and three or more vibration isolation members may be supported. The blower body 2 may be supported.
In each of the above-described embodiments, the present invention is applied to the backpack blower 1. However, the present invention is applied to a backpack-type brush cutter, a power spreader, a power sprayer, a pruning machine, a backpack-type hedge trimmer, and a backpack-type green mower. It may be applied to a backpack-type working machine such as.

  The present invention can be used for a backpack-type working machine.

The side view which shows the backpack type blower which concerns on 1st Embodiment of this invention. The perspective view which shows a vibration isolator. Sectional drawing which shows a vibration isolator. Sectional drawing which shows a vibration isolator when the downward displacement of a blower main body is large. Sectional drawing which shows a vibration isolator when the displacement to the rotation direction of a blower main body is large. Sectional drawing which shows the vibration isolator which concerns on 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Back blower (back carrying work machine), 2 ... Blower main body (work machine main body), 3 ... Frame, 4, 4A ... Anti-vibration member, 21 ... Engine, 31 ... Back support part, 32 ... Mount part, 41 ... Case member (case part), 42 ... Extension member (extension part), 43 ... Rubber member (elastic member), 46 ... Spring (elastic member), 221 ... Insertion hole, 321 ... Stopper part, 413 ... Upper surface part (Fixing part), 423 ... receiving part.

Claims (3)

A work machine body having an engine;
A frame having an L-shape in a side view and having a back support portion and a pedestal portion for supporting the work implement main body;
A vibration isolating member that connects the work implement main body and the gantry unit;
The vibration isolator is
A fixing part fixed to the gantry part;
An extending part extending downward from the fixed part from the work implement body;
A portion of the extension portion below the fixing portion and an elastic member that connects the fixing portion ;
A portion of the extension portion below the fixing portion is provided in parallel with the gantry portion, and a receiving portion to which one end of the elastic member is fixed is provided.
The pedestal portion is provided with a case portion protruding upward from the pedestal portion,
The upper surface portion of the case portion is the fixed portion, and the upper surface portion is formed with an insertion hole through which the extending portion is inserted,
The back working machine characterized in that the receiving part and the elastic member are housed in the case part . In the backpack type work machine according to claim 1,
A portion of the extension part below the fixed part is arranged in parallel with the gantry part, and a receiving part to which one end of the elastic member is fixed is formed.
A shoulder-type working machine , wherein a stopper portion that comes into contact with the receiving portion when the elastic member extends a predetermined amount is provided below the receiving portion . A work machine body having an engine;
A frame having an L-shape in a side view and having a back support portion and a pedestal portion for supporting the work implement main body;
A vibration isolating member that connects the work implement main body and the gantry unit;
The vibration isolator is
A fixing part fixed to the gantry part;
An extending part extending downward from the fixed part from the work implement body;
A portion of the extension portion below the fixing portion and an elastic member that connects the fixing portion;
A portion of the extension part below the fixed part is arranged in parallel with the gantry part, and a receiving part to which one end of the elastic member is fixed is formed.
A shoulder-type working machine is provided below the receiving portion, and provided with a stopper portion that comes into contact with the receiving portion when the elastic member expands by a predetermined amount.

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