JPS6346266B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Purpose of the invention [Field of industrial application] The present invention relates to a general-purpose internal combustion engine used as a drive source for equipment for agricultural work, civil engineering work, and other various types of work, or as a drive source for portable generators, pumps, etc. The present invention relates to an air cleaner that is connected to a carburetor of an engine, and particularly to an air cleaner that is suitable for a cyclone type pre-cleaner attached to a main cleaner.

[Conventional technology]

Using filter media such as filter paper or urethane foam alone,
Alternatively, an air cleaner may be used in which a cyclone-type pre-cleaner is placed on the side of the air cleaner main body, and the air, after all dust has been separated and removed, is introduced into the air cleaner main body through an opening on the side of the air cleaner. No. 5504/Sho 54-
20689) is known.

[Problem that the invention seeks to solve]

The pre-cleaner of the air cleaner has an air cleaner case with an introduction duct that causes a swirling flow in the introduced air, and a dust pan that receives separated dust, which are stacked one on top of the other.

In other words, since the lower dust pan is simply a cup, it is easy to mold. However, since the upper air cleaner case has an air introduction duct that opens laterally at a tangential position on the side surface, it is difficult not only to mold it with synthetic resin but also to die-cast or press mold it.

The present invention aims to solve the above-mentioned problems related to case molding in conventional air cleaners, and to further improve sealing performance and reduce the intrusion of foreign matter.

B. Structure of the Invention [Means for Solving the Problems] The cleaner case has an upper and lower halves structure in which a cleaner case with an open bottom surface and a dust pan with an open top surface are fitted together with their open surfaces. An air introduction duct is integrally formed with an open lower surface that extends laterally, and the dust pan has an open upper surface that matches the downward open surface of the air introduction duct of the cleaner case, and a diagonally downward direction. The air intake port, which opens toward the air intake, is integrally formed and extends laterally, and the air intake port and the air introduction duct are communicated with each other by fitting and connecting the cleaner case and dust pan vertically. .

[Effect]

When the air cleaner case and dust pan are fitted and connected, the air intake port fits from below into the air introduction duct whose bottom surface is open, forming a duct.The air enters the case from the air intake port through the duct. The dust-free air flows through the outlet to the carburetor.

〔Example〕

In the figure, reference numeral 1 denotes the main body of a general-purpose internal combustion engine, and an air guide cover 2 that covers an engine cooling fan integrated with a flywheel is attached to one side of the main body. Furthermore, a recoil starter 3 is attached to the outside of the cover 2.

A fuel tank 4 is mounted and fixed at a position close to one side of the top surface of the engine body 1, and an air cleaner body 6 and a muffler 7 with a cyclone type pre-cleaner 5 attached to the side of the tank 4 are installed, and the air cleaners 5 and 6 act as a recoil starter. They are installed side by side so that they are located on the 3rd side.

A cylindrical filter medium in which a filter paper 8 and a urethane foam 9 are stacked inside and outside is housed in the air cleaner body 6, and the inner space of the cylindrical filter medium 8, 9 is a ventilation duct 1.
0 to the carburetor 11.

An air outlet 51 at the top of the cyclone type precleaner 5 is aligned with an air inlet 61 opened on the side surface of the air cleaner body 6, and the precleaner 5 is attached to the air cleaner body 6 by a flange connection 12. A tightening bolt 13 for the flange connection 12 is screwed into a nut 15 of a nut attachment plate 14 superimposed around the mouth 61 on the side surface of the air cleaner body 6.

As shown in FIG. 5, the cyclone pre-cleaner 5 is formed into upper and lower halves, with an upper cleaner case 5A and a lower dust pan 5B. It is tightened and fixed with several screws 16 (shown in the third figure).

The cleaner case 5A is integrally formed with an air introduction duct 53 that projects laterally in the tangential direction and has an open bottom surface. In the center of the cleaner case 5A,
A swirl guide vane 55 is integrally provided around the air guide tube 54 and can be attached or detached from below.

The cleaner case 5 is placed on the edge of the dust pan 5B.
An air intake port 56 that meets the open surface of the air introduction duct 53 of A is integrally formed and projects laterally. The air intake port 56 faces diagonally downward, and the lattice 5
It has a 7 on it.

It goes without saying that there is also a mark conduit continuous to the mark conduit 52 at the joint portion of the air introduction duct 53 and the air intake port 56. Dust exhaust holes 58 are opened at several locations around the bottom of the dust pan 5B. Its dust exhaust hole 58
8 faces in the opposite direction to the air intake port 56 so that the dust coming out of the dust exhaust hole 58 does not flow toward the air intake port 56, as shown by the arrow in FIG.

When the pre-cleaner 5 is attached to the air cleaner main body 6, the air intake port 56 of the pre-cleaner 5 is located on the opposite side of the muffler 7, as shown in FIGS. It is formed in a dimension that does not protrude beyond the surface including the side surface of No. 4.

Air sucked into the precleaner 5 from the intake port 56 as the engine operates is swirled by the tangential duct 53 and the swirl guide vane 55.
Dust with a large specific gravity such as sand and dust descends along the inner wall of the dust pan 5B and is discharged from the dust exhaust hole 58.
On the other hand, the air from which most of the dust has been removed rises inside the central cylinder 54 and passes through the duct 59 to the ports 51 and 61.
The air is introduced into the air cleaner main body 6 through the filter media 8 and 9, where it is further cleaned.

C. Effects of the Invention As described above, in the air cleaner of the present invention, when the air cleaner case 5A and the dust pan 5B are vertically fitted and connected, the air introduction duct 5 has an open lower surface projecting laterally from the air cleaner case 5A.
3 and the diagonally downward or downwardly directed air intake 56 formed by extending laterally from the edge of the dust pan 5B and having an open upper surface, so that the air intake and the air introduction duct communicate with each other. Connect the air cleaner case 5A and dust pan 5B to the air intake port 56.
It can be easily manufactured by injection molding of synthetic resin integrally with the air introduction duct 53 having the structure, and the sealing performance of the fitting portion of both members 5A and 5B can be improved.

Since the air intake port 56 is oriented obliquely or downwardly, water and foreign matter are less likely to be sucked in, thereby improving the durability of the air cleaner.

Note that, as in the embodiment, a grid 57 is provided at the air intake port 56.
If a grid is installed, large debris such as dry grass can be placed in the grid 5.
7 prevents me from entering. When the engine is stopped, the debris falls out by itself and does not clog the air intake.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a general-purpose internal combustion engine equipped with the air cleaner of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is an enlarged front view of the general-purpose internal combustion engine with the air cleaner taken longitudinally, and Fig. 4 is a longitudinal view of the air cleaner. 5 is an exploded perspective view of the air cleaner of the present invention, FIG. 6 is a bottom view of the air cleaner case, FIG. 7 is a plan view of the dust pan, and FIG. 8 is an exploded perspective view of the air cleaner of the present invention. Bottom view. 1 is a general-purpose internal combustion engine, 5 is a cyclone pre-cleaner, 5A is an air cleaner case, 5B is a dust pan, 53 is an air introduction duct, 56 is an air intake port, 57 is a grid, 6 is an air cleaner body, 7 is a muffler, 8, 9 10 is the ventilation duct, 11 is the carburetor.

Claims (1)

[Claims] 1 It consists of a top and bottom halves, with a cleaner case with an open bottom and a dust pan with an open top, fitted together with their open sides. The introduction duct is integrally formed, and the dust pan has an air intake port on the side that opens so that the top surface matches the downward open surface of the air introduction duct of the cleaner case, and the mouth opens diagonally downward. What is claimed is: 1. An air cleaner that is integrally formed so as to protrude toward one side, and has an air intake port and an air introduction duct communicating with each other by fitting and connecting a cleaner case and a dust pan in the upper and lower sides.