JPS5843606Y2 - Engine breather device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a reed valve type breather device installed in an engine.

As is well known, a reed valve type breather device has a breather plate, a reed valve fixed to the plate, and an open channel control plate, and a breather cover fixed to the outside is bulged outward and inside the breather plate. Although a breather valve chamber is formed, this has the following disadvantages.

That is, as shown in FIG. 5, the end of the breather pipe 32 attached to the breather cover 31 hits the open channel regulating plate 33 and is blocked, making it impossible to operate as a breather.

In order to prevent this, it is possible to make the open channel restriction plate 33 smaller so that it does not hit the end of the breather pipe 32, as shown in Fig. 6, but this time, when the reed valve 34 is opened, Closing the breather pipe 32 will not solve the problem.

Therefore, the breather cover 31 had to be large and deep, which was uneconomical.

This idea solves the above-mentioned drawbacks.In order to prevent the breather pipe from being blocked by the open channel regulation plate and reed valve, a notch is provided in the part of the open channel regulation plate facing the breather pipe through which booby gas can pass. was formed.

It has the greatest feature.

Examples of this invention will be described below with reference to the drawings.

Figure 1 is a longitudinal sectional side view of the main parts of an air-cooled vertical side valve engine, Figure 2
The figure is an extracted view of part ■ in Figure 1.

In the figure, blow-by gas leaking from the combustion chamber 1 of the engine into the crank chamber 2 passes through the outlet hole 3, the tappet chamber/breather chamber 4, the breather device 5, the breather valve chamber 6, and the breather pipe 7, and then passes through the air cleaner 8. The air is sucked into the air chamber.

The breather chamber 4 is recessed in the upper part of the front wall of the crankcase 9, and a fitting wall 10 is integrally provided around the outer opening of the breather chamber 4 and projects from the crankcase 9.

Reference numeral 11 is a breather cover, which is attached to the fitting wall 1 of the breather chamber 4.
The crankcase 9 has a stepped portion 12 that fits externally into the crankcase 9.
is fixed with bolt 13.

A mounting pipe 14 for the breather pipe 7 projects from the front wall of the cover 11, and the breather pipe 7 made of rubber is fitted therein.

The breather device 5 is a breather plate (back wall of the breather valve chamber 6)
15, a reed valve 17 for opening and closing the artificial hole 16, and an open channel regulating plate 18 located outside the valve 17 for regulating the maximum opening of the valve 17.

The valve 17 and the regulating plate 18 are connected to the pleather plate 1 by rivets 20 together with a deflector 19 on the back side of the breather plate 15.
It is fixed at 5.

The inlet of the breather pipe 7 is located exactly on the front surface of the regulating plate 18, and the tip of the regulating plate 18 is cut out on both the left and right sides, and by forming the notches 21, as shown in FIG. The inner diameter of the breather pipe 7 is smaller than that of the breather pipe 7 to prevent the inlet of the breather pipe 7 from being blocked by the regulating plate 18 and the reed valve 17.

FIG. 4 shows another embodiment of this invention, in which a notch 21 is provided in the center of the tip of the open channel regulating plate 18, and the breather valve chamber 6 is constantly closed.
The blow-by gas is made to flow from the core cleaner 8 through the breather pipe 7.

Since this invention is configured as described above, it has the following effects.

In other words, since a notch is provided in the part of the open-drain regulation plate facing the breather pipe in the breather valve chamber, the inlet of the breather pipe is not blocked by the open-drain regulation plate and the reed valve, allowing blow-by gas to be routed outside the crankcase. can be discharged normally.

Further, unlike the conventional example, there is no need to make the breather cover large, and the breather cover can be made small, which is economical.

[Brief explanation of drawings]

The drawings show an embodiment of this invention; Fig. 1 is a longitudinal cross-sectional side view of the main parts of an air-cooled vertical side valve engine, Fig. 2 is an enlarged view of the section ■ in Fig. 1, and Fig. 3 is an enlarged view of the section ■-■ in Fig. 2. The cross-sectional view, FIG. 4 is a view corresponding to FIG. 3 showing another embodiment, and FIGS. 5 through 6 are views corresponding to FIG. 2 showing a conventional example. 6... Breather valve chamber, 7... Breather pipe, 15...
・Back wall of 6 (breather board), 16... entrance hole, 17.
... Reed valve, 18 ... Open channel regulation plate, 21 ... Notch.

Claims (1)

[Scope of utility model registration request] An inlet hole 16 is formed in the back wall 15 of the breather valve chamber 6, and a reed valve 17 for opening and closing this artificial hole 16 and an open channel regulation plate 18 for regulating the maximum open channel of this valve 17 are fixed to the inner wall 15. An engine characterized in that a breather pipe 7 from a breather valve chamber 6 is arranged in front of the regulation plate 18, and a notch 21 through which blow-by gas can pass is formed in a portion of the regulation plate 18 facing the breather pipe 7. breather device.