JPS639793Y2 - - Google Patents

Description

[Detailed description of the invention] For example, in a backpack-type powered working machine such as a backpack-type power brush cutter, a cylindrical anti-vibration rubber can be interposed between the prime mover and the mount in order to prevent the vibration of the backpack mount. This is a commonly used method, and the installation axis of the anti-vibration rubber is oriented diagonally upward to disperse the force applied to the anti-vibration rubber in the compression direction and the shear direction, thereby improving anti-vibration performance and durability. is also being carried out.

However, the working head of this type of work equipment, which is connected to the prime mover via a flexible shaft etc., has a single-rod shape and a double-rod shape, even in the case of a brush cutter, and each has a different weight. To obtain anti-vibration performance, it is necessary to replace each with a dedicated anti-vibration rubber, and of course it is also necessary to change the anti-vibration rubber when the prime mover is changed.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a vibration isolator having a wide range of compatibility and to solve the conventional disadvantages.

Hereinafter, the present invention will be explained in detail based on the embodiments shown in the figures.

An embodiment of the present invention is shown in FIG.
This is a so-called single-rod type backpack in which an operating rod 4 having a mowing device 5 is connected via a flexible shaft 3 to a prime mover 2 such as a small two-stroke air-cooled engine placed on a pedestal 6 installed horizontally at the lower end. This is an example of a shaped brush cutter.

Mounting metal fittings 7 having inner mounting seats 8 that stand up diagonally inward are equally distributed at three locations along the circumference of the pedestal 6 on this pedestal 6.

Next, a support shaft 12 is provided to protrude downward from the center of the base plate 13 fixed to the lower surface of the prime mover 2.
2 is provided with a dish-shaped receiving plate 9 rotatably relative to the prime mover 2 via a bearing 11, and the peripheral edge of the receiving plate 9 is bent obliquely outward and downward to form an outer side facing the inner mounting seat 8. A mounting seat 10 is provided, and a vibration isolating member 14 is interposed therebetween.

This vibration isolating member 14 has substrates 21 and 22 having doglegged cross-sections facing inwardly fixed to both ends of a prismatic column 19 made of an elastic material 19 such as rubber. Two different mounting surfaces 15, 16 and 15, 16' are formed parallel to those facing each other, a screw hole is provided in the center of each surface, and a rotation prevention claw portion 18 is provided at the end. As shown in FIG. 2, the mounting surfaces 16 and 16' are interposed and fixed between the inner and outer mounting seats 8 and 10 with screws 17.

In this state, the mounting axis l of the vibration isolating member 14 naturally faces upward and outward, and the load from the prime mover 2 applied to the elastic member 19 is a compressive force along the mounting axis l and a shearing force perpendicular to the downward direction. Furthermore, the forces applied from all directions during operation are applied to the four mounting surfaces 15, 15' and 16, 1.
6', it is possible to form a vibration isolating device with excellent vibration damping performance and durability as a whole.

Furthermore, as shown in Figure 3, change the mounting surface and
5, 15', mounting surfaces 16, 16' are arranged above and below the elastic member 19, and most of the load from the prime mover 2 is supported by the mounting surface 16 as compressive force, which increases the rigidity of the vibration isolator. It is possible to increase
This is suitable when the work head 4 or the prime mover 2 is changed to a heavier one.

Further, the vibration damping performance can be easily changed by providing notches 20 on both sides of the elastic material 19 as shown in the figure.

As described above, according to the present invention, the substrate of the vibration isolating member is formed into a dogleg shape and the mounting axis is oriented diagonally upward, thereby eliminating the need to replace the vibration isolating member even if the airframe conditions change. It is possible to provide a vibration isolating device with excellent vibration isolating performance and durability, which has a wide range of compatibility.

[Brief explanation of the drawing]

Fig. 1 is a complete perspective view of a backpack-type brush cutter implementing the present invention, Fig. 2 is an enlarged partial sectional view of the main parts of Fig. 1,
and FIG. 3 are main part sectional views showing another usage example. 2... Prime mover, 6... Frame, 14... Vibration isolating member, 19... Elastic material, 21, 22... Substrate, l...
...Mounting axis.

Claims (1)

[Scope of utility model registration request] Substrates 21 and 22 having dogleg-shaped vertical cross-sections facing inward are fixed to both ends of the elastic material 19, and two attachment surfaces 15 and 16 and 15' and 16' in different directions are attached to the respective substrates 21 and 22. A vibration isolating device in which a vibration isolating member 14, which is formed parallel to each other and facing each other, is interposed between a prime mover 2, which is a vibration source, and a pedestal 6, so that its mounting axis l faces obliquely upward.