JPS5936690Y2 - Engine carburetor flexible connection device - Google Patents

Description

[Detailed description of the invention] When the engine of a portable working machine, such as a chainsaw, is configured to absorb vibration with the machine frame via a vibration isolator, the engine body and carburetor are generally assembled separately. .

In this case, these members are connected via a flexible tube, since mutual vibration causes positional deviation.

This flexible tube has flanges for attachment at both ends.

However, it is extremely difficult to tighten screws to the engine or the fuselage surface through the collar in a narrow space inside the fuselage, and the present invention attempts to improve this drawback.

A detailed explanation will be given below using examples.

FIG. 1 shows a vertical cross-section of the main part of the carburetor device of a chainsaw according to an embodiment of the present invention.

FIG. 2 shows a longitudinal section of the flexible tube of the embodiment.

FIG. 3 shows a plan view of the flexible tube shown in FIG. 2.

FIG. 4 shows a plan view of the other side collar member which can be freely engaged with and detached from the flexible tube shown in FIG. 2.

The flexible tube 3 is a thin flexible tube body made of an elastic material such as rubber and formed into an appropriate bellows shape. It is integrally baked in advance and has two screw holes 6, 6 for mounting.

This flange member 5 is actually connected to a cylinder on the engine side or a glued valve intake port (not shown) on the side of the crankcase.

At the other open end 7 of the flexible tube 3, a trapezoidal protrusion 9 is formed on a part of the circular periphery 8 and projects laterally.

The protruding side portion 9 forms a main part for locking and fixing with another flange member 4 during assembly.

The circular periphery 8 is reinforced with appropriate rigidity.

On the other hand, the collar member 4, which is formed and separated from the flexible tube 3 so that it can be freely engaged and detached, has a concave groove 11 that can be freely engaged and detached from the trapezoidal protrusion 9 around the through hole 10 through which the flexible tube 3 is inserted. A jetty 12 for emergency use is provided around this area.

Then, a bolt hole 1 for attaching the bolt 14 for attaching to the fuselage frame 13 is stretched with the axis of the through hole 10 as the axis of symmetry.
5 is set.

Between both bolt holes 15, a seat 16 for mounting the carburetor 2 is formed around the through hole 10 on the same plane as the circular periphery 8 including the groove 11, and the seat 16 is formed on the outside of the through hole 10. Bolt holes 17 for attaching the carburetor 2 are provided at required positions.

The flange member 4 is made of a rigid material, such as Bakelite material outside metal or synthetic resin material, which has strength, high rigidity, good heat insulation properties, and is inexpensive, which are sufficiently suitable for use.

Further, this assembled flexible tube is designed to have a string-like protrusion 18 wrapped around its outer peripheral end surface in order to maintain airtightness through contact with a mating member.

As described in detail above, in this proposal, the flexible tube for connecting the engine and the carburetor is attached to one end of the carburetor by separating the seat part and the flange member provided with the collar so that it can be freely engaged and detached in an airtight manner. This contributes to making it easier to assemble the engine of a machine such as a chain saw, which is light and has a complex structure.

For example, in the case of the embodiment chain saw, the flexible tube 3 according to the present invention
The flange member 5 on the side provided integrally with the engine body is attached to the engine body side and assembled in advance into the fuselage frame 13, but on the other hand,
The circular periphery 8 of the flexible tube 3 is fitted into the through hole 10 of the collar member 4, which can be freely engaged and detached from the outside of the machine frame 13, and is lightly crimped to compress the flexible tube 3, while the Kosan 14 is attached to the machine frame. 13 is installed by tightening the bolts in accordance with the parts, and finally, by attaching the carburetor 2 to the collar member 4, the work is not only a stacking process but also easy to perform, as well as maintaining airtightness as a flexible connecting pipe. It can perform its functions.

[Brief explanation of drawings]

Fig. 1: A vertical sectional view of the main part of the carburetor device of a chainsaw according to the present embodiment; Fig. 2: A vertical new view of the flexible tube according to the present embodiment; Fig. 3:
FIG. 4 is a plan view of the flexible tube, and a plan view of the detachable collar member. 1...engine body, 2...carburizer,
3... Flexible tube, 4, 5... Flange member, 7
...... Opening end, 13... Airframe frame, 14.
14...Kousan, 16...The carburetor is installed on the seat part.

Claims (1)

[Scope of utility model registration request] In an engine for a portable work machine having a structure in which the engine body 1 and the carburetor 2 are separated and assembled and connected to each other via a flexible tube 3, the engine body 1 and the carburetor 2 are installed at both ends of the flexible tube 3. Of the collar members 4 and 5, the flexible tube 3 on the carburetor side
A seat part 16 for attaching the carburetor is provided to the collar member 4 which can be freely engaged and detached from the body frame 13.
Kosan 14.14 for attachment to the flexible tube 3 is stretched.
The carburetor side opening end 7 of the carburetor 2 is connected to the carburetor 2 by the collar member 4.
A flexible connection device for an engine carburetor, characterized in that it is configured to be able to be airtightly pressed into contact with the engine.