JPS581615Y2 - Crank chamber ventilation system in engines - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a crank chamber inspection device in an engine.

For example, in a horizontal engine often used as a prime mover for a tiller, the blazer device is provided directly facing the crank chamber.

In this type of engine, when the engine is used in a tilted position, the blazer device is immersed in oil in the crank chamber.
A large amount of oil is discharged outside the crank chamber through the device, which has the drawback of significantly increasing oil consumption.

In order to eliminate this drawback, this invention communicates with the blow picus discharge passage led out from the breather device,
It is characterized in that an oil separation tank is provided to catch and stop the oil passing through the passage.

Examples of this invention will be described below based on the drawings.

FIG. 1 is a longitudinal sectional front view of a main part of a horizontal water-cooled engine, and FIG. 2 is a sectional view taken along the line - W1.

As shown in the figure, the inside of the crankcase 1 is divided by a slanted wall 2 into a crank chamber R and an ice chamber.

An opening 4 is opened in the rear end wall of the crank chamber R for assembling the connecting rod 3, etc., and this opening 4 has a button.
It is covered by 5.

Reference numeral 6 denotes a breather device provided using the cover 5 described above, in which a breather chamber 7 and a reflux oil chamber 8, which are partitioned adjacent to the upper half of the cover 5, are covered with a breather valve unit. Become.

This blazer valve unit includes a plate body 10 that is screwed to the joint surface of the cover 5, a reed valve 11 and a valve operation regulating plate 1 that are fastened together to the plate surface of the plate body 10 facing the blazer chamber 7.
It is composed of 2.

13 is a blazer hole that is opened and closed by the reed valve 11, 14
15 is a deflector that covers the lower surface of the oil return hole 14, and is located below the blazer device 6 and located on the plate body. A meandering chamber 3o is formed in a region surrounded by the deflector 10 and the cover 5, and accommodates the deflector 15 and the fins 31 protruding from the cover 5.

A gas outlet passage 16 for discharging blow-by gas is led out from the upper surface of the pleather chamber 7, and a cylindrical oil separation tank 17 is provided in communication with the outlet end of this outlet passage 16. ing.

As shown in FIG. 2, this oil separation tank 17 is provided with a gas inlet pipe 18 that communicates with the gas outlet passage 16 on the right end of its bottom wall, and also on the lower pot wall near the left end. A gas outlet 19 for communicating with the atmosphere and a return pipe 20 are provided respectively.

As shown in FIG. 1, the gas outlet 19 is formed in the shape of an inverted single character, with its outer end opening downward, and is located higher and further away than the outlet of the gas pipe 18.

Further, the oil return pipe 20 is communicated with the return oil chamber 8 via a return oil passage 21.

Reference numeral 22 denotes a band for fixing the oil tank 17, and this band is fixed to the fuel tank bracket 23 with screws.

Reference numeral 0 in the figure indicates lubricating oil stored at the bottom of the crank chamber R.

According to the above configuration, even when the blazer device 6 is immersed in zero oil as shown by the imaginary line in FIG.
can prevent external emissions.

That is, the oil 0 that has moved in the gas outlet path 16 together with the blow-by-cus is transferred to the oil separation tank 17 via the inlet pipe 18.
However, at this time, due to the sudden change in cross-sectional area and the difference in kinetic inertia between the gas and oil 0, the gas and oil 0 are separated from the return pipe 2.
0 and the return oil passage 21 into the reflux oil chamber 8,
The oil is collected into the crank chamber R from the oil return hole 14.

Further, since the gas outlet 19 of the oil separation tank 17 is higher than the inlet pipe 18 and opens at a distance, the blow-by gas blown from the inlet pipe is prevented from blowing through to the outside air, and good oil separation can be performed. That's how it is.

Note that the structure of the blazer device 6 is not limited to the reed valve type.

As explained above, in this invention, an oil separation tank is provided in the gas outlet path led out from the breather device in communication with it, so even if the breather device is immersed in oil, the gas outlet path The oil that is about to be discharged to the outside can be separated in the oil separation tank, thereby preventing wasteful discharge of oil especially when the engine is tilted, and greatly reducing oil consumption.

In addition, when the engine is used in the normal upright position, the blow-by-cuss and oil are separated in the blazer device, and the same kind of separation is also carried out in the oil separation tank, resulting in a crank with high oil separation performance as a whole. Ventilation of the room is obtained.

In addition, the separated oil from the flow bicass, which passes through the oil separation tank and returns to the return oil chamber, is indirectly returned to the crank chamber via the meandering chamber provided below the blazer device, so it is directly transferred from the oil separation tank to the crank chamber. Compared to the configuration that returns oil,
To eliminate the risk of blow-by gas from the crank chamber not going to the blazer device and directly entering the oil separation tank, the two-stage oil separation between the blazer device and the oil separation tank is reliably maintained, and the oil is removed. Separation performance can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, and FIG. 1 is a longitudinal cross-sectional view of a main part of a horizontal engine, and FIG. 2 is a cross-sectional view taken along the line ■--■ in FIG. 1. 6... Blazer device, R... Crank chamber, 16...
Gas outlet path, 7...breather chamber, 17...oil separation tank,
21...Return oil path.

Claims (1)

[Scope of utility model registration request] In an engine in which a blazer device 6 is provided facing the crank chamber R, the upper space of the blazer chamber of the blazer device 6 is connected to an oil separation tank 17 in the form of a closed container provided separately from the blazer device 6 via a gas outlet path 16. The oil reservoir in the oil separation tank 17 is connected to the return oil chamber 8 provided next to the breather chamber 7 via the return oil passage 21, and the gas outlet 19 in the separation tank 17 is connected to the gas inlet. It is opened at a position higher than the outlet of the pipe 18 and at a position farther from the outlet of the gas inlet pipe 18 to discharge the blow-by gas to the outside air, and a separated oil from the blow-by gas returning to the blazer device 6 is provided below the blazer device. A crank chamber ventilation system characterized by returning air to the crank chamber R via a meandering chamber 30.