JPH08242742A - Knapsack type power working machine - Google Patents

Abstract

PURPOSE: To provide a knapsack type power working machine, capable of effectively relaxing vibration transmitted from a power source to a knapsack frame and good in stability and operating efficiency of the power source. CONSTITUTION: Cushioning materials 12 are provided on both left and right sides of a power source 5 when viewed from an operator carrying a knapsack frame 1 and used as those for relaxing the vibration in the vertical directions and front and rear directions acting on the knapsack frame 1 in the knapsack type working machine having the power source 5 attached through the cushioning materials 12 to the knapsack frame 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backpack type power atomizer, which is equipped with a power source such as an internal combustion engine on a backpack.
Regarding a backpack-type power working machine such as a backpack-type power spreader or a backpack-type power brush cutter, in particular, an elastic member such as rubber or a spring is interposed as a cushion material between the power source and the backpack rack, and a worker The present invention relates to a technology for reducing vibrations from a power source or the like transmitted to a vehicle.

[0002]

2. Description of the Related Art Conventionally, as this type of backpack-type power working machine, (a) a cushioning material is provided between the bottom of a power source and a backpack (see, for example, Japanese Utility Model Laid-Open No. 3-9126). (B) A cushion material is provided between the bottom of the power source and the backpack and between the back of the backpack and the vibration source (see, for example, Japanese Utility Model Publication No. 54-53136).
(C) One in which the upper and lower sides of the power source are attached to the backpack via cushioning materials (for example, actual Kaihei 4-1)
13751), (d) a power source suspended from a backpack via a cushion member above the power source (see, for example, Japanese Utility Model Publication No. 58-20086).

[0003]

However, the above-mentioned (a),
With (b) and (c), the anti-vibration property was not yet sufficient.

Further, the above-mentioned (d) has a high vibration-proof effect, but on the other hand, it is unstable because the power source has too much freedom of displacement. For example, a recoil starter type internal combustion engine is used as the power source. When used, there is a problem that the starting operation is extremely difficult.

The present invention has been made in view of the above circumstances, and the vibration transmitted from the power source to the backpack is effectively alleviated, and the stability and operability of the power source are good. It is intended to provide a power working machine.

[0006]

In solving the above problems, the inventors of the present invention have found out in what kind of vibration of the power source the vibration causes a particular uncomfortable feeling to the operator. As a result of examination, it was found that there were vertical vibrations and worker's longitudinal vibrations. This is because the vertical vibration is transmitted to the shoulder of the worker through the backpack band provided on the backpack, while the longitudinal vibration is directly transmitted to the back and waist of the worker. On the other hand, the vibration in the left-right direction acts so as to slide in the left-right direction substantially parallel to the back surface of the worker, and therefore does not adversely affect the human body as much as the vibration in the vertical direction or the front-back direction. .

Based on these findings, the backpack-type power work machine according to the present invention according to claim 1 is a backpack-type work machine in which a power source is attached to a backpack rack via a cushion material, and the cushion material is It is characterized in that the cushion material is provided on both left and right sides of the power source as seen from an operator carrying the backpack, and cushions the vertical vibration and the longitudinal vibration acting on the backpack.

According to a second aspect of the present invention, in a backpack-type working machine in which an internal combustion engine is mounted on a backpack via a cushion material so that the crankshaft of the engine is lateral, the cushion material is the backpack. A cushioning material that is provided on both left and right sides of the engine when viewed from an operator carrying a rack, and cushions vertical vibrations and longitudinal vibrations that act on the backpack. It is characterized by being located in the same plane as the axis.

[0009]

According to the present invention, the cushioning material on both the left and right sides of the power source (internal combustion engine in claim 2 and the same hereinafter in this paragraph) has at least the upper and lower parts of the vibration transmitted from the power source to the backpack. Vibration in the direction and front-back direction is mitigated. Since the cushion material is provided on both the left and right sides of the power source, the power source has good stability and operability.

According to the present invention of claim 2, further,
The cushion material is located at substantially the same height as the crankshaft, the rotation of which causes a large vibration. For this reason,
This cushion material more effectively absorbs most of the large vibration caused by the rotation of the crankshaft.

[0011]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a backpack-type power sprayer as an example of a backpack-type power working machine according to the present invention as seen obliquely from the right rear side, and FIG. 3 is an exploded perspective view of its essential parts.

This power sprayer has a backpack 1,
On the front side of the backpack 1, a pair of left and right backpack bands 2 to be worn on both shoulders of an operator are provided.

In the illustrated example, the backpack 1 is integrally formed by using an appropriate synthetic resin material, including a chemical liquid tank 3 for containing a chemical liquid for spraying and the like. In addition, the backpack 1
Has a pedestal portion 4 that extends rearwardly integrally therewith. The pedestal portion 4 acts as a base for attaching a power source and the like described below, and also acts as a foot portion when the power sprayer is placed on the ground or the like.

On the back surface 1a side of the backpack 1 and in the space between the pedestal portion 4 and the tank 3, a small internal combustion engine 5 of the starting type by a recoil starter 19 is used as a power source. Is provided. In this internal combustion engine 5, a crankshaft 6 housed in a crankcase 5c is horizontally arranged horizontally in the front-rear direction of the backpack 1, and a cylinder portion 7 thereof is arranged upward. By the support members 8 supporting the left and right sides,
It is supported above the pedestal portion 4. The support members 8 and 8 are arranged parallel to each other on the left and right, and are erected on the pedestal portion 4.
Is stopped by. Contrary to the illustrated example, the support members 8 and 8 have their upper portions fixed to the chemical liquid tank 3,
The engine 5 may be supported on the lower side thereof.

A reciprocating pump 10, for example, is provided as an actuating device in front of the engine 5 and between the back surface 1a of the backpack 1. This pump 10
Has a plunger 10a (see FIG. 5) therein which is substantially level with the crankshaft 6 of the engine 5.
It is arranged in a direction orthogonal to the crankshaft 6 so as to reciprocate in the left-right direction of the backpack 1, and is fixed to the engine 5 so as not to come into contact with parts other than the engine 5. ing. The pump 10 includes the crankshaft 6 of the engine 5 via a speed reducer (not shown).
And is operatively connected to the engine 5, and is powered by the engine 5 to pump the chemical liquid in the tank 3 toward the spray nozzle 11.

Cushion members 12 and 13 are interposed between the support members 8 and 8 and the engine 5 to reduce vibrations transmitted from the engine 5 side to the backpack 1 side during operation of the engine 5. are doing. This cushion material 12,
13 are positions corresponding to each other on the left and right sides of the engine 5 so as to mitigate the vertical vibration and the front-back vibration that have a large adverse effect on the operator among the vibrations generated by the operation of the engine 5. It is installed horizontally horizontally.

The arrangement of the cushion members 12 and 13 provides a stable support while supporting the combined body of the engine 5 and the pump 10, which is a vibration source, with vibration isolation.
It can be appropriately determined on the left and right sides of the engine 5 and the pump 10. In the present embodiment, in order to obtain a high vibration isolation effect, a pair of left and right cushion members 12, in a horizontal plane H (see FIGS. 2 and 5) having substantially the same height as the crankshaft 6 on the front side of the engine 5, 12 is arranged, and on the rear side of the engine 5, a pair of left and right cushion materials 13, 13 is arranged diagonally below the front cushion materials 12, 12.

When arranged in this way, the pair of left and right cushion members 12, 12 on the front side are positioned directly beside the crankshaft 6 of the engine 5 and the plunger 11 of the pump 10 which are sources of large vibrations. Therefore, it acts as a main cushion material that particularly effectively absorbs vertical and longitudinal vibrations caused by their operation. On the other hand, the pair of left and right cushion members 13, 13 on the rear side are
It acts as a sub cushion material that assists the cushion effect of the main cushion materials 12, 12. At the same time, the main cushion materials 12, 12 and the auxiliary cushion materials 13, 13
Needless to say, acts to support the combined body of the engine 5 and the pump 10.

The auxiliary cushion material 13 is mainly used as an auxiliary for the purpose of stopping the fluctuation of the engine 5. For example, as shown by a phantom line in FIG.
The pump 10 can be appropriately changed by, for example, arranging the pump 10 on the pedestal 4 so as to support it from below.

The cushion materials 12 and 13 are as follows.
Appropriate materials such as rubber and springs that can absorb and absorb vibrations and can support the weight of the engine 5 and the pump 10 can be used. In the present embodiment, the individual cushion members 12 and 13 are attached to the axis X of the cushion members 12 and 13 so as to be more effective in damping the vertical vibration and the longitudinal vibration.
It is made of rubber in the shape of a drum which is constricted so that its cross-sectional area gradually becomes smaller toward the central portion in the direction (see FIGS. 2 and 4). Then, each of the cushion materials 12, 13
The axis line X is directed in the left-right direction when viewed from the operator carrying the backpack 1, and is interposed between the left and right support members 8 and the engine 5.

As shown in an enlarged view of the right main cushion material 12 in FIG. 4, connecting fittings 14a and 14b are fixed to the left and right ends of the cushion materials 12 and 13, respectively. These connecting fittings 14a and 14b are, for example, those in which screw rods 16a and 16b are projected from the centers of parallel chamfered circular plate-like fittings 15a and 15b. The connection fittings 14a and 14b are the plate-like fittings 15
In the portions a and 15b, the cushion materials 12, 13
The screw rods 16a and 16b are fixed to both left and right end surfaces of the cushion member 12 by baking or the like, and extend horizontally to the left and right sides of the cushion members 12 and 13.

The screw rods 16b of the main cushion material 12 extending toward the engine 5 are connected to the female thread attachment portions 5a provided on both the left and right sides of the crankcase 5c of the engine 5. A screw rod 16a of the main cushion member 12 extending to the outside of the engine 5 is inserted into a front one of the mounting holes 8b formed in the support member 8 and fixed by a nut 8c from the outside. .

On the other hand, the threaded rods 16b of the auxiliary cushion member 13 extending toward the engine 5 are inserted into the mounting holes 5d on both the left and right sides of the mounting bracket 5b attached to the rear side of the crankcase 5c from the inside. It is fixed with a nut 5e. The screw rod 16a of the sub-cushion member 13 extending outward of the engine 5 is inserted into the rear side of the mounting holes 8b formed in the support member 8 and fixed by a nut 8c from the outside. There is.

In the figure, 17 is a fuel tank of the engine 5. The fuel tank 17 is arranged so as not to come into direct contact with the engine 5 in order to prevent foaming due to vibration during work. In the illustrated example, it is located below the engine 5, and is arranged on the upper surface of the pedestal portion 4 with an appropriate vibration-proof sheet 18 interposed therebetween. The fuel tank 17 may be fixed so as to be sandwiched between the support members 8 in the left-right direction, and the pedestal portion 4 may be fixed.
Alternatively, they may be fixed with screws or the like.

According to the backpack type power sprayer according to the present embodiment having the above-described structure, the operation of the engine 5 and the pump 10 causes a large vibration especially from the engine 5 side. The backpack 1 from the side
The vibration transmitted to the side is effectively alleviated by the cushion materials 12 and 13.

Particularly, since the cushion members 12 and 13 are arranged and shaped suitable for absorbing the vertical vibration and the longitudinal vibration as described above, the cushion members 12 and 13 are placed on the shoulders and backs of the worker. Almost no such unpleasant vibrations are transmitted.

Further, the crankshaft 6 of the engine 5,
Since the plunger 10a of the pump 10 is orthogonally arranged, a vibration canceling effect can be expected.

Further, since the engine 5 is supported from both the left and right sides of the engine 5, the stability is good, and the starting operation by the recoil starter 19 is not inconvenient.

In this embodiment, the case where the internal combustion engine 5 and the reciprocating pump 10 which are apt to generate particularly large vibrations due to their operation are adopted as the power source and the operating device have been described. A battery-operated electric motor or the like can be used as the actuating device, for example, a rotary pump or the like, and of course, a backpack-type power working machine in which only the engine part is mounted on the backpack, such as a backpack-type brushcutter. You can also

[0031]

According to the present invention as set forth in claim 1, the vibration transmitted from the power source to the backpack is effectively mitigated, and the stability and operability of the power source are good.

According to the second aspect of the present invention, the large vibration caused by the rotation of the crankshaft of the internal combustion engine is further effectively alleviated.

[Brief description of drawings]

FIG. 1 is a perspective view of a backpack-type power sprayer as an example of a backpack-type power working machine according to the present invention, as viewed from diagonally right rear.

FIG. 2 is a rear view showing a simplified main part of FIG.

FIG. 3 is an exploded perspective view of a main part of FIG.

FIG. 4 is an enlarged perspective view of a cushion material.

5 is a left side view showing a simplified principal part of FIG. 1 in correspondence with FIG.

[Explanation of symbols]

 1 backpack 5 power source (internal combustion engine) 6 crankshaft 12 cushion material H crankshaft plane

Claims (2)

[Claims] 1. A backpack-type working machine in which a power source (5) is attached to a backpack (1) via a cushion material (12), wherein the cushion material (12) is the backpack (1).
A cushion member (1) provided on both left and right sides of the power source (5) when viewed from an operator carrying the back cushion to reduce vertical and longitudinal vibrations acting on the backpack (1).
2) The backpack type power working machine. 2. A backpack-type working machine in which an internal combustion engine (5) is mounted on a backpack rack (1) via a cushioning material (12) such that its crankshaft (6) is in a horizontal direction. 12) are provided on the left and right sides of the engine (5) as seen from an operator carrying the backpack (1) to reduce vertical vibration and longitudinal vibration acting on the backpack (1). Cushion material (1
2), and further, the cushion material (12) is located in substantially the same plane (H) as the crankshaft (6).