JPH0618025Y2 - Breather device for side valve type general-purpose engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a breather device for a side valve type general-purpose engine.

(Prior Art) FIG. 2 shows a breather device 1 for a conventional side valve type general-purpose engine.
This is an example. In such a conventional engine, the blow-by gas discharge composed of the breather check valve 3 formed integrally with the lid 2 of the valve spring chamber 1 and the rubber hose 4 and the clip 5 for fixing the rubber hose 4 is used. It is common to provide a passage. 6
Is an air cleaner, and 7 is a pipe for attaching a rubber hose fixed to the lid 2 of the valve spring chamber by welding or the like.

(Problems to be solved by the invention) However, in the above-mentioned conventional example, since the parts of the rubber hose 4 and the clip 5 are required, the cost of the apparatus increases, the number of assembling steps increases, and the blow-by gas discharge passage is almost horizontal. Therefore, it becomes difficult to separate oil and blow-by gas.
Therefore, especially when the engine is tilted, the amount of oil sprayed to the air cleaner increases, which causes an increase in the amount of lubricating oil consumed and causes troubles around the combustion chamber due to combustion of the lubricating oil.

An object of the present invention is to provide a breather device for a general-purpose engine that solves the above-mentioned drawbacks of the conventional device, reduces the number of assembling steps, reduces the cost, reduces the consumption of lubricating oil, and increases the durability of the engine. It is in.

(Means and Actions for Solving the Problem) A breather device for a side valve type general-purpose engine according to the present invention is a side in which a breather valve is attached to a lid of a valve spring chamber that is communicated through a gas vent hole in a cylinder block. In a valve-type general-purpose engine, a breather passage whose lower end communicates with the breather valve is formed in the cylinder block by bending it substantially vertically and in the vicinity of the lower end in a substantially horizontal direction, and connecting the upper end of the breather passage and an air cleaner. It is characterized in that a gas communication path for the gas is provided in the insulator and the carburetor. As a result, the assembly of the device can be facilitated, the number of parts can be reduced, and the oil and blow-by gas can be completely separated, and the above object can be achieved.

(Embodiment) An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, 11 is a cylinder block, 12 is a breather valve (valve spring lid), 13 is a breather passage formed substantially vertically, 14 is a heat insulator, 15 is a carburetor, and 16 is an air cleaner.

The breather passage 13 is formed by removing rust when the cylinder block 11 is casted. Further, as shown in FIG. 1, the breather passage is connected to the breather valve 12 by horizontally bending the vicinity of the lower end portion thereof. Further, in order to connect the breather passage 13 to the air cleaner 16, a gas passage 20 is provided at the heat insulator 14, the carburetor 15, and the decleaner 16 in a substantially horizontal direction, that is, in a direction substantially perpendicular to the breather passage 13. At the same time, a gas conduit 2 is formed in these joint combinations.
Packings 17, 18, and 19 with 0 are installed.

Next, the operation of the above embodiment will be described.

The blow-by gas in the cylinder block 11 enters the valve spring chamber 21 through the gas vent hole, is separated from the lubricating oil by the breather valve 12, and is connected to the gas passage 2 formed in the cylinder block 11, the insulator 14, and the carburetor 15.
0 flows into the air cleaner 16 and is reburned.

In the blow-by gas, oil is separated when passing through a substantially right-angled bent portion near the lower end of the breather passage 13 in a substantially vertical cylinder block, and when passing through a vertical passage, the oil is separated by gravity. Further, the oil is separated even when passing through the bent portion of the breather passage 13 and the gas communication passage 20 that are substantially perpendicular to each other.

That is, in the blow-by gas, the oil component is almost completely separated at the four locations of the breather valve 12, the bent portion at the lower end of the breather passage 13, the vertical passage, and the bent connection portion between the breather passage 13 and the gas conducting passage 20. 16 will be guided.

(Effects of the Invention) As described above, in the breather device for a side valve type general-purpose engine according to the present invention, a substantially vertical breather passage is bored in the cylinder block, and a gas communication passage from the breather passage to the air cleaner is provided. Since it is built in the insulator and the carburetor, there is no need for a breather pipe or the like unlike the conventional one, and the assembly is easy, the number of parts is reduced, and the cost is reduced. In addition, the blow-by gas from which oil has been temporarily separated by the breather valve is passed through a vertical breather passage that has a bent portion at the lower end in the cylinder block, so that residual oil is secondarily separated, and the breather passage and gas are separated. Since the residual oil is separated even when passing through a bent portion that is substantially perpendicular to the conduction path, the effect of separating the oil in the blow-by gas is increased, and the performance of the general-purpose engine when tilted is improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a breather device for a side valve type general-purpose engine according to the present invention, and FIG. 2 is a schematic explanatory diagram of a conventional example. 13 ... Breather passage in cylinder block, 14 ... Insulator, 15 ... Vaporizer, 16 ... Air cleaner, 20
… Gas conduit.

Claims (1)

[Scope of utility model registration request] 1. A side valve type general-purpose engine in which a breather valve is attached to a lid of a valve spring chamber communicated with a breather valve in a cylinder block, and a breather passage whose lower end communicates with the breather valve is formed in the cylinder block. A gas passage that is formed substantially vertically and is bent substantially horizontally in the vicinity of the lower end and that is connected to the upper end of the breather passage and the air cleaner and that extends in a direction substantially perpendicular to the breather passage is built in the insulator and carburetor. A breather device for a side valve type general-purpose engine characterized by being provided at most.