JP2506890Y2 - Backpack work machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backpack-type working machine, and more particularly to a mounting structure for mounting an engine main body to a backpack-carrying platform in a vibration-insulated state in the backpack-type working machine.

[0002]

2. Description of the Related Art There are known backpack-type working machines such as brush cutters in which an engine body is mounted as a power source on a backpack frame carried by a worker. It has a structure in which it is attached to a backpack mount via a mounting structure having members. With such a conventional structure,
When an operator tilts or shakes the backpack while he is working, the engine body tilts or sways significantly, and the force generated by it is transmitted to the shoulders of the worker through the backpack, which causes a considerable amount of work to the worker. However, there is a drawback that the vibration damping member is easily damaged. As a countermeasure against this, the utility model No. 50-26014 and the utility model No. 50-1592
No. 8, JP-A-60-101394, etc., it has been proposed to attach the upper and lower parts of the engine body to the backpack mount via vibration-proof members, but the stability is poor and the vibration-proof properties are sufficient. There were drawbacks such as not.

[0003]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to eliminate the above-mentioned drawbacks of the prior art and to provide a simple and convenient backpack type working machine.

[0004]

According to the present invention, in a backpack-type working machine including a backpack mount and an engine body mounted on the backpack mount, a bottom mounting for mounting the bottom portion of the engine body to the backpack mount. And a top mounting structure for mounting the top of the engine body to the backpack mount, each of the bottom mounting structure and the top mounting structure has a vibration damping mechanism including a vibration damping rubber, and the bottom mounting structure is The engine mounting base is attached to the backpack mount via a plurality of vibration isolation mechanisms.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a backpack type working machine according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view of a power unit of a backpack-type brush cutter as an embodiment of the present invention, and FIG.
It is an expanded sectional view of the part enclosed by the circle A. A backpack frame 1 (a backpack band or the like is omitted) carried by an operator has a substantially L-shape, and a bottom portion 2 of an engine body 4 is mounted on a foot portion 26 thereof via a bottom portion mounting structure 3. There is. The bottom mounting structure 3 is fixed at its lower end to the foot portion 26 of the backrest mount 1, and is, for example, 1 around the vertical axis OO.
Three anti-vibration mechanisms 5 and 6, 6 arranged at intervals of 20 degrees
And a base 7 attached to the bottom of the engine body 4 is attached to a bearing portion 25 provided at the center of the base 7 coaxially with the axis O-O. The main body 4 is mounted so as to be rotatable in the horizontal direction. Further, the engine body 4 has its top portion 11 attached to an upper portion 9 of the backpack mount 1 via an upper mounting structure 8. The upper attachment structure 8 is a bracket whose one end is fixed to the upper portion 9 of the backpack mount 1. 10 and a vibration isolation mechanism 12 mounted between the other end of the bracket 10 and the top 11 of the engine body 4.
And Anti-vibration mechanism 5, 6, 6 of the bottom mounting structure 3
Since any material having an appropriate structure such as a coil spring may be used, only the vibration isolation mechanism 12 of the upper mounting structure 8 will be described in more detail.

The vibration isolating mechanism 12 of the upper mounting structure 8 has vibration isolating rubbers 15 having end members 13 and 14 fixed to the upper and lower ends thereof as shown in FIG.
It is fixed to the cylinder 27 via a screw receiving portion 22 provided at a position through which the axis O-O of the top portion 11 of the engine body 4 is passed by a screw 16 protruding from 4. The upper end member 13 has a screw hole 17 coaxial with the bearing OO opened upward, and a bolt 18 is screwed into the screw hole 17 from above. The bolt 18 is a bearing bush 20 rotatably fitted into a bearing guide cylinder 21 fixed to a hole 19 coaxial with the axis O-O formed at the other end of the bracket 10 of the backpack mount 1. Then, the upper end member 13 is fixed to the bracket 10 by penetrating the protective cap 28 that covers these parts. In addition, the upper end member 1
An engaging recess 23 for a rotation preventing tool is formed in the third portion, the lower end member 14 is cup-shaped, and the outer periphery thereof is formed with a parallel chamfered wrench hook portion (not shown). Therefore, it is preferable that the antivibration rubber 15 is not twisted when the antivibration mechanism 12 is attached or detached. When the cylinder cover or the like forming the top portion 11 of the engine body 4 is made of synthetic resin, the screw receiving portion 22 is made of a heat insulating material such as Bakelite and the reinforcing ring 24 is inserted thereinto. It is possible to prevent the heat from being transferred from the cylinder 27 to the like and prevent the melting accident of the cover and the like. In this way, the bottom mounting structure 3 and the upper mounting structure 8 cooperate to make the engine body 4 rotatable about the axis O-O, and transmit the vibration to the backpack mount 1. To prevent excessive tilting and rolling of the engine body 4.

[0007]

[Effects of the Invention] With the configuration of the present invention described above, the present invention effectively reduces vibration during use, and reliably prevents excessive tilting and cornering of the engine body during work. The rotation of the engine body is smooth, and the load on each mounting structure at the time of starting the recoil can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic side view of a power unit of a backpack type brush cutter as an embodiment according to the present invention.

FIG. 2 is an enlarged sectional view of a portion surrounded by a circle A in FIG.

[Explanation of symbols]

 1 backpack mount 2 bottom part of engine body 3 bottom mounting structure 4 engine body 5, 6, 12 vibration isolation mechanism 7 engine mounting base 8 top mounting structure 11 engine body top 15 antivibration rubber

Claims (1)

(57) [Scope of utility model registration request] 1. A backpack-type working machine including a backpack mount (1) and an engine body (4) mounted on the backpack mount, wherein a bottom mounting structure for mounting a bottom portion (2) of the engine body to the backpack mount. (3) and an upper mounting structure (8) for mounting the top part (11) of the engine body to the backpack mount
And the bottom mounting structure and the top mounting structure each include a vibration isolation mechanism (5, 6, 1) including a vibration isolation rubber (15).
2) and the bottom mounting structure has an engine mounting base (7) attached to the backpack mount via a plurality of vibration isolation mechanisms (5, 6, 6). Backpack type working machine.