JP2010133376A - Backpack type working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backpack type working machine which provides good attenuation performances and of which working machine body is supported in a stable posture. <P>SOLUTION: Since a shaft member 42 fixed on the working machine body 2 and a cylinder member 41 fixed on a pedestal part 32 of a frame 3 are connected by an elastic member 43, vertical vibration of the working machine body 2, and therefore vertical vibration of the shaft member 42 is attenuated by shear deformation of the elastic member 43, and good attenuation performances equivalent to a case putting shear type rubber cushion between a back pad part and the working machine body 2 is provided. Since vertical vibration of the working machine body 2 is attenuated by vertical vibration of the shaft member 42 with the elastic member 43 deformed in a shear direction, vertical vibration of the working machine body 2 is attenuated while supporting the working machine body 2 in the stable posture in the same manner as a case putting compression type cushion rubber between the pedestal part 32 and the working machine body 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

  2. Description of the Related Art Conventionally, for example, a shoulder-type blower is known as a shoulder-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 reduced 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.

  In addition, in a shoulder-type blower, a plurality of vibration isolating rubbers are provided between the backrest and the blower body, and the vibration isolator rubber supports the blower body and reduces vibration transmitted from the blower body to the frame. A thing is also known (for example, patent document 2). In the blower of Patent Document 2, the vibration isolating rubber supports the blower body while being shear-deformed in a rhombus shape with respect to its own weight. Further, the anti-vibration rubber attenuates the vibration by shearing in the vertical direction with respect to the vertical vibration from the blower body, and reduces the vibration transmitted from the blower body to the frame.

JP 2008-637779 A JP 2002-39267 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 that supports the blower body, a vibration-proof spring may be used in place of the vibration-proof rubber, but even in such a case, the vibration-proof spring is compressed to support the blower body, so that the vibration is also attenuated. There is a problem that the performance is lowered.

  On the other hand, in the blower of Patent Document 2, since the shear type vibration-proof rubber that supports the blower body while shearing deformation is used, the spring constant can be set lower than in the case of using the compression type vibration-proof rubber ( Soft materials can be used) and good damping performance can be obtained. However, in the blower of Patent Document 2, the vibration-proof rubber is configured to dampen the vibration by shearing in the vertical direction against the vertical vibration from the blower body, so that the blower body tends to tilt. There's a problem.

  An object of the present invention is to provide a backpack-type work machine that can obtain good damping performance and can support the work machine body in a stable posture.

  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 part, and the anti-vibration member is fixed to the gantry part, and is fixed to the blower main body and inside the cylindrical member. A shaft member that passes therethrough, and an elastic member that connects the cylindrical member and the shaft member are provided.

  In the shoulder-type work machine according to claim 2 of the present invention, the elastic member is a rubber member, and includes an arm portion extending between the cylindrical member and the shaft member, and the arm portion includes the arm. An adjustment hole for penetrating the portion and adjusting the damping performance of the rubber member is formed.

  In the shoulder-type work machine according to claim 3 of the present invention, a flange portion fixed to the work machine main body is provided on the shaft member, and the elastic member is a rubber member. A cylindrical reinforcing portion having an inner peripheral surface fixed; and an arm portion extending between the reinforcing portion and the cylindrical member, the reinforcing portion extending to the flange portion, and an upper end of the reinforcing portion is , And is fixed to the flange portion.

  In the shoulder type work machine according to claim 4 of the present invention, the elastic member is a spring, one end side is fixed to the cylindrical member, the other end side is fixed to the shaft member, and the shaft is disposed in the elastic member. The member is inserted, It is characterized by the above-mentioned.

  In the shoulder work machine according to claim 5 of the present invention, the cylindrical member protrudes from the gantry side to the work machine body side.

According to the first aspect of the present invention, the cylindrical member fixed to the gantry portion of the frame and the shaft member fixed to the working machine main body and passing through the cylindrical member are connected by the elastic member. The vertical vibration, and hence the vertical vibration of the shaft member, can be damped by the shear deformation of the elastic member, which is equivalent to the case where a shear type anti-vibration rubber or anti-vibration spring is provided between the backrest and the work machine body. Good attenuation performance can be obtained.
In addition, since the elastic member shears and the shaft member vibrates up and down, the vertical vibration of the work implement main body is attenuated. Therefore, a compression-type anti-vibration rubber or anti-vibration spring is provided between the gantry and the work implement main body. Similarly to the case, the vertical vibration of the work implement main body can be attenuated while supporting the work implement main body in a stable posture.

  According to the invention of claim 2, since the elastic member is a rubber member and the adjustment hole is formed in the arm portion, the damping performance of the vibration isolating member can be easily adjusted by the diameter and number thereof. That is, the adjustment hole can be easily formed by using a pin when forming the elastic member, and can also be easily formed by making a hole in the arm portion with a drill. Also, the diameter of the adjustment hole can be easily enlarged with a drill or the like. Therefore, in the present invention, since the damping performance of the vibration isolating member is adjusted by the adjustment hole whose diameter and number can be easily adjusted, the damping performance of the vibration isolating member can be easily adjusted.

  According to the invention of claim 3, the elastic member is a rubber member, and the reinforcing portion whose inner peripheral surface is fixed to the shaft member has an upper end extending to the flange portion and is fixed to the flange portion. Therefore, since not only the inner peripheral surface but also the upper end of the reinforcing portion is fixed to the shaft member, the elastic member can be firmly fixed to the shaft member.

According to the fourth aspect of the present invention, since the side of the elastic member (spring) fixed to the cylindrical member undergoes large shear deformation, the vertical vibration of the work implement main body is damped, so that good damping performance can be obtained. . Further, since the vertical vibration of the work implement main body is attenuated by vibrating the shaft member up and down, the vertical vibration of the work implement main body can be attenuated while supporting the work implement main body in a stable posture.
In addition, since the elastic member is a spring, the vibration isolator can be easily manufactured by fixing one end of the elastic member to the cylindrical member and fixing the other end to the tip of the shaft member using, for example, a bolt. The vibration member can be easily manufactured.

  According to the invention of claim 5, since the cylindrical member protrudes from the gantry part side to the work machine main body side, the work machine main body can be supported at a high position. Therefore, the engine can be easily arranged so as not to interfere with the fuel tank to be arranged on the gantry, and the design of the backpack type work machine can be facilitated.

[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. The volute case 22 is divided into two parts. 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 32, a hole 321 (see FIG. 3) is formed at a 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 isolation members 4 and the vibration isolation spring 5 support the blower body 2 with respect to the frame 3 at three points and reduce vibration transmitted from the blower body 2 to the frame 3. To do.

FIG. 2 is a perspective view showing the vibration isolator 4 with the stopper 423 removed, and FIG. 3 is a cross-sectional view showing the vibration isolator 4. FIG. 3 shows the vibration isolating member 4 in a state where the blower main body 2 is not under its own weight.
As shown in FIGS. 2 and 3, the vibration isolation member 4 includes a tubular member 41, a shaft member 42 that passes through the tubular member 41, and a rubber member 43 that serves as an elastic member that connects the tubular member 41 and the shaft member 42. It has.

  The tubular member 41 includes a tubular portion 411 and a first flange portion 412 that is provided at the lower end of the tubular portion 411 and is fixed around the hole 321 of the gantry portion 32 with a bolt 44 and a nut 45. In the present embodiment, the first flange portion 412 is fixed around the hole 321 so that the cylindrical portion 411 protrudes from the gantry portion 32 toward the blower body 2 side. Accordingly, the cylindrical portion 411 extends downward from the first flange portion 412, that is, the first flange portion 412 is fixed around the hole 321, so that the cylindrical portion 411 is mounted from the first flange portion 412. Compared with the configuration that falls into the hole 321 of the portion 32, the present embodiment can support the blower body 2 at a high position. Therefore, the engine 21 can be easily arranged so as not to interfere with the fuel tank 23, and the blower 1 can be easily designed.

The shaft member 42 includes a shaft portion 421, a second flange portion 422, and a stopper portion 423.
The lower end side of the shaft part 421 passes through the hole 321 of the gantry part 32. A screw hole 425 is formed in the lower end surface 424 of the shaft portion 421.
The second flange portion 422 is provided at the upper end of the shaft portion 421. The vibration isolator 4 is fixed to the volute case 22 by the second flange portion 422 being inserted into the fixing groove 223 of the volute case 22.
The stopper portion 423 is attached to the other end side of the shaft portion 421 by making the diameter larger than the hole 321 of the pedestal portion 32 and being bolted to a screw hole 425 formed in the shaft portion 421.

The rubber member 43 includes a reinforcing portion 431 and an arm portion 432.
The reinforcing portion 431 is formed in a cylindrical shape that surrounds the entire shaft portion 421, and the inner peripheral surface is bonded and fixed to the outer peripheral surface of the shaft portion 421. The upper end of the reinforcing portion 431 extends to the second flange portion 422, and the end surface 4311 thereof is bonded and fixed to the second flange portion 422. In this embodiment, since the inner peripheral surface of the reinforcing portion 431 is adhesively fixed to the entire outer peripheral surface of the shaft portion 421 in this way, the upper end surface 4311 is adhesively fixed to the second flange portion 422. The rubber member 43 can be firmly fixed to the shaft member 42.

FIG. 4 is a view showing the back surface of the vibration isolating member 4 with the stopper portion 423 removed.
As shown in FIGS. 3 and 4, the arm portion 432 extends between the tubular member 41 and the shaft member 42. Specifically, the arm portion 432 has a central portion of the reinforcing portion 431 by forming a concave portion 433 that is curved in plan view and in cross section around the shaft portion 421 on the back surface of the rubber member 43. It is formed in the shape of a ring extending obliquely downward. The arm portion 432 is extended between the tubular member 41 and the shaft member 42 by fixing the end surface 4321 thereof to the inner peripheral surface 4111 of the tubular member 41.

  The arm portion 432 supports the weight of the blower body 2 while deforming in the shear direction. In FIG. 3, as described above, the vibration isolating member 4 in a state where the weight of the blower body 2 is not applied is shown. However, in the state where the weight of the blower body 2 is applied to the vibration isolation member 4, the arm portion 432 is Then, shear deformation is performed so that the upper surface of the arm portion 432 is horizontal.

  In the present embodiment, the arm portion 432 attenuates the vibration by vertically deforming the vertical vibration from the blower body 2 so as to dampen the vibration. Good damping performance equivalent to that provided with a vibration rubber or vibration-proof spring can be obtained.

  In the present embodiment, the arm portion 432 is shear-deformed in the vertical direction, and the shaft member 42 vibrates up and down to attenuate the vertical vibration of the blower body 2, so that the compression type is provided between the gantry portion 32 and the blower body 2. As in the case of providing the anti-vibration rubber and anti-vibration spring, the vertical vibration of the blower body 2 can be attenuated while supporting the blower body 2 in a stable posture. The rubber member 43 not only vibrates in the vertical direction of the blower body 2 but also in the horizontal direction, the rotational direction (twisting direction), and the torsional direction (rotating direction around the shaft member 42) of the blower body 2. And displacement can also be attenuated.

FIG. 5 is a diagram illustrating the action of the vibration isolating member 4 when the downward displacement of the blower body 2 is very large.
Here, in this embodiment, since the vibration isolating member 4 is configured by connecting the tubular member 41 and the shaft member 42 by the rubber member 43, when the downward displacement of the blower body 2 is very large, As shown in FIG. 5, the lower end of the blower body 2 (volute case 22) comes into contact with the upper end of the cylindrical member 41. Therefore, in this embodiment, even when the downward displacement of the blower body 2 is very large, the displacement can be suppressed. Moreover, it can suppress that the arm part 432 deform | transforms excessively.

  Even if the arm portion 432 is cut, the blower body 2 falls due to its own weight, and the lower end of the blower body 2 comes into contact with the upper end of the cylindrical member 41. However, even in such a case, in the present embodiment, when the blower body 2 is tilted, the shaft member 42 and the reinforcing portion 431 are hooked on the edge of the hole 321 of the gantry portion 32. The connection state between the frame 2 and the frame 3 can be maintained.

FIG. 6 is a diagram illustrating the operation of the vibration isolating member 4 when the displacement of the blower body 2 in the rotational direction is very large.
Further, in this embodiment, since the shaft member 42 is inserted through the gantry 32, when the displacement of the blower body 2 in the rotation direction is very large, the stopper 423 is provided with the gantry 32 as shown in FIG. 6. It will contact | abut to the back surface. Therefore, in this embodiment, even when the displacement in the rotation direction of the blower body 2 is very large, the displacement can be suppressed. Moreover, it can suppress that the arm part 432 deform | transforms excessively.

  By the way, in the arm part 432 that attenuates the vertical vibration of the blower body 2 in this manner, as shown in FIGS. 3 and 4, four adjustment holes 434 that penetrate the arm part 432 are formed. The adjustment hole 434 can be easily formed by using a pin when the rubber member 43 is molded. Even after the adjustment holes 434 are formed, the number can be easily increased by making holes in the arm portions 432 with a drill. Also, the diameter of the adjustment hole 434 can be easily enlarged by a drill or the like. Therefore, in the present embodiment, the damping performance of the arm portion 432 can be easily adjusted by forming the adjustment hole 434 in the arm portion 432, which can be easily adjusted in diameter and number, and as a result, the vibration isolating member 4 The attenuation performance can be easily adjusted.

[Second Embodiment]
FIG. 7 is a sectional view showing a vibration isolating member 4A according to the second embodiment of the present invention. Hereinafter, the same functional parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.
As shown in FIG. 7, the present embodiment is characterized in that a spring 46 is used as an elastic member that connects the tubular member 41 and the shaft member 42. One end side of the spring 46 is fixed to the upper end portion of the cylindrical portion 411 of the cylindrical member 41, and the other end side is fixed to the lower end of the shaft member 42 with a bolt 426. A shaft member 42 is inserted into the spring 46. The diameter of the spring 46 decreases from one end side fixed to the cylindrical member 41 toward the other end side fixed to the shaft member 42. The other configuration of the vibration isolating member 4A of the present embodiment is the same as that of the first embodiment.

Also in this embodiment, since the upper part of the spring 46 is greatly sheared and deformed, the vertical vibration of the blower body 2 is damped, so that a good damping performance can be obtained. Further, since the vertical vibration of the blower body 2 is attenuated by vibrating the shaft member 42 up and down, the vertical vibration of the blower body 2 can be attenuated while supporting the blower body 2 in a stable posture.
Further, since the spring 46 is used as the elastic member, one end side of the spring 46 is fixed to the cylindrical member 41, and the other end side is fixed to the lower end of the shaft member 42 by the bolt 426, so that the vibration isolating member 4A is easily manufactured. This makes it easy to manufacture the vibration isolating member 4A.

[Modification of Embodiment]
It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in the first embodiment, the reinforcing portion 431 surrounds the entire shaft portion 421, but the reinforcing portion 431 is formed at the base end portion of the arm portion 432 and surrounds only the central portion of the shaft portion 421. Also good.

  In each of the above-described embodiments, when the diameter of the hole 321 of the gantry part 32 is smaller than the diameter of the stopper part 423 and the displacement of the blower body 2 in the rotation direction is very large, the stopper part 423 becomes the gantry part 32. It was comprised so that it might contact | abut on the back surface. However, the diameter of the hole 321 of the gantry part 32 is formed larger than the diameter of the stopper part 423, and the stopper part 423 is configured to contact the first flange part 412 of the cylindrical member 41 that is exposed from the hole 321. May be. If comprised in this way, the vibration isolator 4 can be inserted in the hole 321 from the upper part of the mount part 32, with the stopper part 423 attached to the axial part 421, and installation of the vibration isolator 4 can be made easy.

In each of the above-described embodiments, the cylindrical portion 411 protrudes from the gantry portion 32 toward the blower body 2, but the cylindrical portion 411 extends downward from the first flange portion 412, and the cylindrical portion 411 extends from the first flange portion 412. It may be configured to fall into the hole 321.
In each said embodiment, although the shaft member 42 penetrated the cylinder member 41, the shaft member 42 does not need to penetrate the cylinder member 41, and should just pass the cylinder member 41. What is necessary is just to be arrange | positioned in the cylinder member 41. FIG.

  In the second embodiment, the one end side of the spring 46 is fixed to the upper portion of the cylindrical member 41, but the one end side of the spring 46 may be fixed to an appropriate place of the cylindrical member 41 by an appropriate method. . In the second embodiment, the other end side of the spring 46 is fixed to the lower end of the shaft member 42 by a bolt 426, but the other end side of the spring 46 is appropriately placed at an appropriate place on the shaft member 42. It may be fixed in a way.

In each of the above embodiments, the blower body 2 is supported by the two vibration isolating members 4 and 4A. However, the blower body 2 may be supported by only one, and the blower body 2 may be supported by three or more. It may be.
In the first embodiment, the rubber member 43 is used as the elastic member, and in the second embodiment, the spring 46 is used as the elastic member. However, an elastic resin may be used as the elastic member. .
In each of the above-described embodiments, the present invention is applied to the backpack blower 1. 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 the vibration isolator of the state which removed the stopper part. Sectional drawing which shows a vibration isolator. The figure which shows the back surface of the vibration proof member of the state which removed the stopper part. The figure which shows the effect | action of a vibration isolator when the downward displacement of a blower main body is very large. The figure which shows the effect | action of a vibration isolator when the displacement to the rotation direction of a blower main body is very large. Sectional drawing which shows the vibration isolator which concerns on 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Backpack type blower (backpack type work machine), 2 ... Blower main body (work machine main body), 3 ... Frame, 4, 4A ... Anti-vibration member, 31 ... Back support part, 32 ... Mount part, 41 ... Cylindrical member, 42 ... Shaft member, 43 ... Rubber member (elastic member), 46 ... Spring (elastic member), 422 ... Second flange portion (flange portion), 431 ... Reinforcement portion, 432 ... arm portion, 434 ... Adjustment hole, 4311 ... Upper end surface (upper end of reinforcement).

Claims (5)

A work machine body having an engine;
A frame that has a back support part and a base part that supports the work machine main body and is formed in an L shape in a side view;
A vibration isolating member that connects the work implement main body and the gantry unit;
The vibration isolator is
A cylindrical member fixed to the gantry,
A shaft member fixed to the blower body and passing through the cylindrical member;
A backpack-type working machine comprising: an elastic member that connects the cylindrical member and the shaft member. In the backpack type work machine according to claim 1,
The elastic member is a rubber member, and includes an arm portion extending between the cylindrical member and the shaft member,
An adjustment hole for adjusting the damping performance of the rubber member is formed in the arm portion so as to penetrate the arm portion. In the backpack type work machine according to claim 1 or 2,
On the upper part of the shaft member, a flange portion fixed to the work implement main body is provided,
The elastic member is a rubber member, and includes a cylindrical reinforcing portion having an inner peripheral surface fixed to the shaft member, and an arm portion extending between the reinforcing portion and the cylindrical member,
The said reinforcement part is extended to the said flange part, and the upper end of the said reinforcement part is being fixed to the said flange part. The shoulder type working machine characterized by the above-mentioned. In the backpack type work machine according to claim 1,
The elastic member is a spring, one end side is fixed to the cylindrical member, the other end side is fixed to the shaft member, and the shaft member is inserted into the elastic member. Machine. The backpack type work machine according to any one of claims 1 to 4,
The cylindrical working machine is characterized in that the tubular member protrudes from the gantry part side to the work machine main body side.

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