JPS61108862A - General purpose engine - Google Patents

Abstract

PURPOSE:To make it possible to enhance the efficiency of air suction in a general purpose internal-combustion engine for civil engineering work, etc., by providing the intake-air port of a precleaner on the side remote from a muffler such that it does not project from a plane including one side surface of an air cleaner. CONSTITUTION:An air cleaner 6 having a precleaner 5 and a muffler 7 are arranged in parallel with each other on one side of an engine body 1 provided on its one side surface with a cooling fan, a flywheel and a recoil starter 3 and on its top surface with a fuel tank 4, the air cleaner 6 being positioned on the starter 3 side while the intake-air port 41 of the precleaner 5 is positioned on the side removed from the muffler 7 to prevent high temperature exhaust gas from being sucked. Further, the intake-air port 51 is not projected outward from the plane F including the side surface of an air cleaner body 6, and therefore, it does not hinder the pulling operation of a rope grip 31 for the starter 3. Thus, the engine may be made to be compact with its entirety, and the cleaners 5, 6 may be made to be short so that the resistance of communication becomes less, thereby it is possible to enhance the efficiency of air suction.

Description

Detailed Description of the Invention A. Purpose of the Invention [Field of Industrial Application] The present invention is a general-purpose device 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 pumps in portable generators, etc. This relates to the arrangement of an air cleaner for an internal combustion engine.

[Conventional technology]

Since this type of internal combustion engine is often used in dusty locations, the material in the air cleaner often becomes clogged, requiring frequent cleaning or replacement of the filter material.

Therefore, general-purpose internal combustion engines are known in which a pre-cleaner such as a cyclone type or a filter type is attached in front of the air cleaner to separate and remove most of the dust.

[Problem that the invention seeks to solve]

However, the pre-cleaner of a conventional general-purpose internal combustion engine equipped with an air cleaner equipped with a pre-cleaner is simply connected to the air inlet of the air cleaner, which has caused various problems.

Because general-purpose internal combustion engines must be compact for their intended use, a pre-cleaner is attached to the air cleaner.

(a) Do not damage the external appearance of the institution.

(b) Less susceptible to external damage.

(C) Inhale cold air.

(d) Reduce the ventilation resistance of the duct connected to the air cleaner.

The following conditions are necessary.

An object of the present invention is to provide a general-purpose internal combustion engine that satisfies the above conditions.

1. Structure of the invention [Means for solving the problem] A general-purpose internal combustion engine in which an engine cooling fan, a flywheel, and a recoil starter are provided on one side of the engine body, and a fuel tank is placed on the upper surface of the engine body. Install the air cleaner with pre-cleaner and the muffler next to the fuel tank, side by side with the air cleaner located on the recoil starter side, and place the air intake of the pre-cleaner on the opposite side of the muffler and out from the surface that includes the side of the air cleaner. It was set up so that it would not occur.

[Function] On the top surface of the engine body, the fuel tank, air cleaner with pre-cleaner, and muffler fit within a substantially rectangular area when viewed from above, making the entire engine compact. Furthermore, it is difficult to operate the air cleaner coil starter with pre-cleaner.

〔Example〕

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

A fuel tank 4 is fixed to one side of the top surface of the engine body L, and next to the tank 4, an air cleaner body 6 with a cyclone type pre-cleaner 5 and a muffler 7 are installed.
The air cleaner 5116 and the coil starter 3 are installed side by side so as to be located on the coil starter 3 side.

Filter paper 8 and urethane foam 9 are placed inside the air cleaner body 6.
A cylindrical filter material in which filter media are stacked inside and outside is accommodated, and the inner space of the cylindrical filter media 8 and 9 is connected to the carburetor 1 through a ventilation duct) 10.
It leads to 1.

Air guide opening on the side of the F-cleaner main body 6
The upper air outlet of the cyclone type precleaner 5 is aligned with the inlet, and the precleaner 5 is attached to the air cleaner body 6 by a flange connection 12. A tightening port 13 for the flange connection 12 is screwed into a nut 5 of a nut attachment plate 14 superimposed around the mouth 61 on the side surface of the air cleaner body 6.

The pre-cleaner 5 is a 1-bottom 2-part type, and its air intake port 51
is opened diagonally downward on the opposite side from the muffler 7. On that day 51, a grid 52 is attached. Further, as shown in Fig. 7J42, the air intake port 51 does not protrude from the surface F including the side surface of the air cleaner main body 6, and furthermore, the pre-cleaner 5 does not protrude beyond the end surface of the muffler 7.In short, the fuel tank 4. Air cleaner with pre-cleaner 5 The main body 6 and the muffler 7 fit within a substantially rectangular range in plan view.

The air sucked into the precleaner 5 from the intake port 51 as the machine 150 operates is rotated by the tangential duct 53 and the rotation guide vane 54, and dust and other high-density dust are collected in the dust pan 55. It descends along the inner wall and is discharged through the small hole 56. On the other hand, the air from which most of the dust has been removed rises L through the center, passes through the duct 57, and is introduced into LI6.
1 into the air cleaner body 6, and is purified by a rough filter material 8119.

C. Effects of the Invention As described above, the general-purpose internal combustion engine of the present invention has an engine cooling fan, a flywheel, and a recoil starter 3 on one side of the engine body 1, and a fuel tank 4 on the top surface of the engine body 1.
In a general-purpose internal combustion engine, an air cleaner with a pre-cleaner 6 and a muffler 7 are installed next to the fuel tank 4 so that the air cleaners 5 and 6 are located on the coil starter 3 side, and the air intake port 51 of the pre-cleaner 5 is installed. Since it is provided on the opposite side from the muffler 7, the high-temperature exhaust gas emitted from the muffler 7 is not sucked into the pre-cleaner 5.The air intake port 51 is provided outside from the surface F including the side surface of the air cleaner body 6. Since it does not protrude, there is no chance of getting stuck when pulling the rope grip 31 of the recoil starter 3 to start the engine.Furthermore, since the pre-cleaner 5 does not protrude outward, it may be damaged by other objects hitting it. In addition, the fuel tank 4φ air cleaners 5, 6, and muffler 7 on one side of the engine body 1 are arranged in a compact manner, giving a good appearance to the entire internal combustion engine, and the pre-cleaner 5 and air cleaner body 6 are directly connected. Alternatively, even if a duct is used, it only needs to be extremely short, which reduces ventilation resistance and improves the engine's intake efficiency.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the general-purpose internal combustion engine of the present invention, FIG. 2 is a plan view, FIG. 3 is an enlarged front view of the general-purpose internal combustion engine taken longitudinally through the pre-cleaner, and FIG. 4 is a longitudinal cross-section through the pre-cleaner and the air cleaner body. FIG. 2 is an enlarged side view of a portion of a general-purpose internal combustion engine. 1 is a general-purpose internal combustion engine, 2 is a wind guide cover, 13 is a recoil starter, 4 is a fuel tank, 5 is a pre-cleaner, 51 is an air intake port, and 6 is an air cleaner body. 61 is an air inlet, 7 is a muffler, 8 and 9 are filter media, 10 is a ventilation duct), and 11 is a carburetor.

Claims (1)

[Claims] (1) In a general-purpose internal combustion engine that has an engine cooling fan, flywheel, and recoil starter on one side of the engine body, and a fuel tank mounted on the top of the engine body, an air cleaner with a pre-cleaner and a muffler are installed next to the fuel tank. , a general-purpose internal combustion engine in which the air cleaners are installed side by side so as to be located on the recoil starter side, and the air intake port of the pre-cleaner is provided on the opposite side of the muffler so as not to protrude from the surface including the side surface of the air cleaner.