JP3922601B2 - Icing kit mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a field work machine used in cold districts, during snowfall, etc., for example, in the vicinity of a low temperature outside air of an internal combustion engine such as a brush cutter, a chain saw or a power sprayer, or an air intake of a carburetor due to the heat of vaporization of gasoline. The present invention relates to a mounting structure of an icing kit that prevents adhesion of frost generated on the surface and inhalation of powder snow.
[0002]
[Prior art]
When outdoor work machines such as those mentioned above are used in cold regions or during snowfall, the heat of vaporization is lost due to the atomization of gasoline in the vaporizer, and moisture in the intake air is cooled in the vicinity of the air intake of the vaporizer. The air intake may be clogged by frosting or sucking powder snow. As a result, there has been a problem that the fuel / air mixing ratio is affected, causing the internal combustion engine to malfunction, or the carburetor causes the icing phenomenon to cause the internal combustion engine to become inoperable.
[0003]
Therefore, conventionally, as a means for solving the above-described problems, the air intake for the carburetor of the air-cooled internal combustion engine is preferably disposed close to and opposed to the cylinder cooling fin on the forced cooling air supply side for cooling the cylinder. The present applicant has provided a carburetor air intake device that guides and supplies warm air around the fins to the intake port of the carburetor (see Japanese Utility Model Publication No. 59-24862).
[0004]
[Problems to be solved by the invention]
Although the means provided by the applicant can prevent the internal combustion engine from malfunctioning and inoperable, the present invention further facilitates the installation of an icing kit for guiding warm air and the removal during summer use. An object of the present invention is to provide an icing kit mounting structure that is simple and inexpensive.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides an icing kit for guiding a part of warm air discharged from a cooling exhaust air discharge port of a cylinder cover of an internal combustion engine to a carburetor side. It is configured to be inserted and locked between the head covers fixed to the cylinder cover, and the other end is fixed to an appropriate position of the internal combustion engine with a locking tool.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall perspective view of a forced air-cooled small two-cycle gasoline engine as an example of an internal combustion engine to which an icing kit according to the present invention is attached, and FIG. 2 is a view of a mounting portion of an icing kit according to an embodiment of the present invention. FIG. 3 is an exploded perspective view, FIG. 3 is a longitudinal sectional view of an icing kit attaching portion shown in FIG. 2, and FIG. 4 is a longitudinal sectional view of an icing kit attaching portion showing another embodiment.
[0007]
In the figure, 1 is a cylinder cover, 2 is an air cleaner, C is a diaphragm type carburetor, 3 is an exhaust port of an exhaust muffler, 4 is a recoil starter, 5 is a fuel tank, 6 is a work machine component (for example, a brush cutter) Operation V), 7 is a spark plug, 8 is a head cover, and 9 is an icing kit.
[0008]
The head cover 8 is provided to protect the spark plug 7 and the like without causing the spark plug 7 and the like to be grounded even when the entire internal combustion engine E is placed upside down during maintenance or other handling. .
[0009]
First, the head cover 8 and the mounting structure of the head cover 8 will be described. As shown in FIGS. 2 and 3, the head cover 8 is formed in a cup shape in advance so that the spark plug 7 and the like are not grounded even when the whole internal combustion engine E is placed in reverse. It is attached to the upper surface part of this with a screw 10.
[0010]
That is, the fitting hole 11 and the locking hole 12 are provided in advance on the upper surface of the cylinder cover 1, and the fitting piece 13 that fits the fitting hole 11 and the locking hole 12 are fitted in the approximate center of both ends of the head cover 8. A locking piece 14 whose tip is bent in the horizontal direction so as to be locked is provided, and the fitting hole 11 and the fitting piece 13, and the locking hole 12 and the locking piece 14 are engaged with each other. The screw 10 is attached to the top of the air-cooled cylinder 17. Accordingly, it is completely fixed by the locking piece 14, the fitting piece 13 and the screw 10 and is configured not to be easily removed. In the figure, reference numeral 15 denotes a screw hole provided on the upper surface of the cylinder cover 1.
[0011]
The present invention relates to the mounting structure of the icing kit 9, and one embodiment thereof will be described next.
[0012]
The internal combustion engine E has an air-cooled cylinder 17 with a cooling fin 16, and a forced cooling fan (not shown) driven by a crankshaft (not shown) of the internal combustion engine E for cooling the cylinder 17. ) Is provided.
[0013]
The cylinder 17 is surrounded by the cylinder cover 1, and the cylinder cover 1 guides cooling air from the forced cooling fan to cool the cylinder 17, and at the same time, the cylinder 17 The cover 1 is opened at an appropriate position to the outside, and an appropriate cooling exhaust air discharge port 18 is formed. After the cooling of the cylinder 17 from the cooling exhaust air discharge port 18, warm air heated appropriately. Is discharged to the outside.
[0014]
In this embodiment, the icing kit 9 formed from a thin steel plate material is attached so as to cover a part of the cooling exhaust air outlet 18 provided on the outer peripheral surface of the cylinder cover 1 on the leeward side, It is attached so as to guide the hot air after cooling the cylinder 17 to the air intake port of the vaporizer C (air cleaner 2).
[0015]
As shown in FIGS. 2 and 3, the icing kit 9 includes the overlapping portion 9 a with the upper surface of the cylinder cover 1 and the cooling exhaust air discharge port 18 provided on the outer peripheral surface of the cylinder cover 1. It is comprised with the warm air guide part 9b which covers a part of.
[0016]
The one end 9c, that is, the tip of the overlapping portion 9a is inserted and locked between the cylinder cover 1 and the head cover 8 fixed to the cylinder cover 1, and the other end 9d, that is, the hot air guide. The lower end of the portion 9 b is fastened together with the lower end of the cylinder cover 1 to the mounting seat portion 21 a protruding from the crankcase 21 with the screw 19 of the locking tool.
[0017]
More specifically, at the leading end 9c of the overlapping portion 9a that overlaps with the upper surface of the cylinder cover 1, standing pieces that are positioned on both sides of the locking piece 14 of the head cover 8 and are locked to the inner surface of the head cover 8 are provided. 20 is formed.
[0018]
That is, in this embodiment, one end 9 c of the icing kit 9 is not only inserted between the cylinder cover 1 and the head cover 8 fixed to the cylinder cover 1, but is further engaged inside the head cover 8. It is configured to be stopped.
[0019]
In the embodiment shown in FIG. 2 and FIG. 3, one end 9c of the icing kit 9 is locked to the inner surface of the head cover 8, but in the other embodiment shown in FIG. One end 9c of the icing kit 9 is inserted between the cylinder cover 1 and the head cover 8 fixed to the cylinder cover 1 and is inserted and locked in a locking hole 21 provided in the cylinder cover 1. Yes.
[0020]
Therefore, even if the head cover 8 is removed, the icing kit 9 can be held in the attached state.
[0021]
The icing kit 9 having the above-described configuration can be easily attached to the cylinder cover 1 without using a plurality of screws as described above, and can be easily removed during summer use.
[0022]
That is, when attaching the icing kit 9, one screw 10 to which the head cover 8 is attached is loosened, and one end 9 c of the icing kit 9 is placed between the cylinder cover 1 and the head cover 8 fixed to the cylinder cover 1. After the head cover 8 is inserted and locked, the head cover 8 is attached with the screw 10, and the other end portion 9 d is fixed to the attachment seat portion 21 a with the cylinder cover 1 with the screw 19.
[0023]
As a result, the icing kit 9 can guide the warm air after the cooling of the cylinder 17 from the cooling exhaust air discharge port 18 of the cylinder cover 1 to the air intake side of the carburetor C. Even when used in low temperature outside air such as during snowfall, the vicinity of the carburetor air intake is not excessively cooled, thus preventing clogging of the carburetor air intake due to frost, icing, powdered snow, etc. And stable engine operation can be continued without affecting engine performance.
[0024]
【The invention's effect】
According to the present invention, attachment and removal of the icing kit to the cylinder cover can be easily performed without requiring any trouble.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of an internal combustion engine equipped with an icing kit according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of a mounting portion of an icing kit according to an embodiment of the present invention.
FIG. 3 is a longitudinal sectional view of an icing kit attaching portion shown in FIG.
FIG. 4 is a vertical cross-sectional view of an icing kit attachment portion showing another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylinder cover 8 Head cover 9 Icing kit 9a Superposition part 9b Hot air guide part 9c One end 9d The other end 18 Cooling exhaust air discharge port 19 Locking tool (screw)
21a Suitable position (mounting seat)
C Vaporizer E Internal combustion engine

Claims (1)

One end (9c) of an icing kit (9) for guiding a part of the hot air discharged from the cooling exhaust air discharge port (18) of the cylinder cover (1) of the internal combustion engine (E) to the carburetor (C) side Is inserted and locked between the cylinder cover (1) and the head cover (8) fixed to the cylinder cover (1), and the other end (9d) is positioned at an appropriate position (21a) of the internal combustion engine (E). An icing kit mounting structure, wherein the icing kit is fixed by a locking tool (19).

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