JPH0645611Y2 - Blow-by gas processing equipment for engines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Use) The present invention relates to a blow-by gas recirculation system for an engine having a blow-by gas recirculation passage that connects a crank chamber and an intake passage.

(Prior Art) Conventionally, for example, as disclosed in Japanese Utility Model Application Laid-Open No. 62-169212, a blow-by gas recirculation passage that connects the inside of the crank case and the intake passage is provided to prevent the blow-by gas from being released into the atmosphere. There is a structure in which the blow-by gas inside is returned to the intake passage.

However, in the case where the blow-by gas is recirculated from the crank chamber as described above, the splashing oil such as the crankshaft enters the blow-by gas recirculation passage, and the infiltrated oil flows into the intake passage together with the blow-by gas. It may be discharged.

On the other hand, for example, as shown in Japanese Utility Model Laid-Open No. 61-94220, there is one in which a blow-by gas recirculation passage is provided with a throttle to separate the oil mist contained in the blow-by gas.

Therefore, in order to prevent the splashing oil from entering and to separate the oil mist contained in the blowby gas, a pipe member protruding into the crankcase is provided at the opening of the blowby gas recirculation passage on the crankcase side. ,
It is possible to form a throttle on this pipe member,
In this case, if the pipe is not set to the predetermined position, the oil mist separated in the blow-by gas recirculation passage will accumulate in the pipe member, and this accumulated oil mist will be discharged into the intake passage together with the blow-by gas. Occurs.

(Purpose of the Invention) The present invention has been made to solve the above-mentioned problems, and positions a pipe member provided at the crankcase side opening of the blowby gas recirculation passage with a simple structure,
Provided is a blowby gas treatment device for an engine in which the oil mist separated in the blowby gas recirculation passage does not accumulate in the pipe member and is discharged to the intake passage together with the blowby gas. The purpose is to do.

(Structure of the Invention) In order to achieve the above object, the present invention provides a blow-by gas treatment apparatus for an engine, which has a blow-by gas recirculation passageway, one end of which opens into a crankcase and the other end of which opens into an intake passage. One of the diameters is smaller than the other diameter, and the center of one and the other diameter has an offset slit through hole.One of the pipe members protrudes into the crankcase with the center of one diameter offset below the center of the other diameter. The blow-by gas recirculation passage provided adjacent to the bulkhead of the crankcase is fitted into the opening on the crankcase side so as to abut the bulkhead.

(Advantages of the Invention) With the above-described configuration, since the pipe member projects into the crankcase, there is no risk of splash oil such as the crankshaft entering the blow-by gas recirculation passage. Since the diameter of the through hole formed in the pipe member is larger on one side than on the other side, the blow-by gas is included in the blow-by gas because it expands when passing through this pipe member. Oil mist is separated.

Since the pipe member can be positioned by bringing the pipe member into contact with the bulkhead, oil mist does not collect in the pipe member. That is, the separated oil mist is not discharged into the intake passage together with the blow-by gas.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the engine 1 has a crankcase 2
A blow-by gas recirculation passage 4 that connects the intake passage 3 with the intake passage 3 is provided.

Then, the crankcase 2 of the blowby gas recirculation passage 4
A pipe member 6 is fitted in the opening 5 on the side. This opening 5 is provided in the crankcase 2 as shown in FIGS. 2 and 3.
It is provided adjacent to the bulkhead 10 and above the crank center 11.

The diameter of one of the pipe members 6a (the inside of the crankcase 2) is smaller than the diameter of the other 6b (the outside of the crankcase 2), and the center 7 of the diameter of one 6a is offset by f from the center 8 of the diameter of the other 6b. It has a through hole 6c. The pipe member 6 is offset from the center 7 of the diameter of one side 6a to the center 8 of the diameter of the other side 6b so that the one side 6a is the crankcase 2
It is fitted into the opening 5 so as to project inward and come into contact with the bulkhead 10.

The pipe member 6 is fixed by fitting the hose 12 into the outer periphery of the other 6b of the pipe member 6 in the above-described state.

An oil separator 13 is provided in the middle of the blowby gas recirculation passage 4 so that almost all of the oil mist contained in the blowby gas is separated.
The separated oil mist is returned to the oil pan 15 via the oil return passage 14.

With the above configuration, since the pipe member 6 projects into the crankcase 2, there is no risk that splash oil such as the crankshaft will enter the blow-by gas recirculation passage 4. Since the diameter of the through hole 6c formed in the pipe member 6 is larger on the one side 6a than on the other side 6b, the blow-by gas expands when passing through the pipe member 6, so that the blow-by gas expands. The oil mist contained therein is separated.

Since the pipe member 6 can be positioned by bringing the pipe member 6 into contact with the bulkhead 10, oil mist does not collect in the pipe member 6.
That is, the separated oil mist is not discharged into the intake passage 3 together with the blow-by gas.

Furthermore, since the opening 5 is provided above the crank center 11, it is possible to further prevent the splashing oil such as the crankshaft from entering.

In this embodiment, since the oil separator 13 is provided in the middle of the blowby gas recirculation passage 4, it is possible to completely prevent the oil mist from being discharged into the intake passage 3 together with the blowby gas.

[Brief description of drawings]

FIG. 1 is a side view of an engine equipped with a blow-by gas treatment apparatus according to an embodiment of the present invention, FIG. 2 is a detailed view of part A of FIG. 1, and FIG. 3 is a sectional view taken along line III-III of FIG. is there. 2 ... Crank case, 3 ... Intake passage, 4 ... Blow-by gas recirculation passage, 5 ... Opening portion, 6 ... Pipe member, 10 ... Bulkhead.

Claims (1)

[Scope of utility model registration request] 1. A blow-by gas processing apparatus for an engine having a blow-by gas recirculation passage, one end of which is opened in a crankcase and the other end of which is opened in an intake passage. With a pipe member having a through hole with an offset center of diameter, with one center of the diameter offset below the center of the other, one protrudes into the crankcase and contacts the bulkhead. A blow-by gas treatment device for an engine, wherein the blow-by gas processing device is fitted in an opening on a crankcase side of the blow-by gas recirculation passage provided adjacent to a bulkhead of the case.