JP2000045749A - Oil separator for blow-by gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the oil except for atomized oil fine particles from coming into a container body of a separator. SOLUTION: A separator comprises a container body 11 of which the lower surface molded integrally with a cylinder head cover C is opened and a bottom lid body 12 fixed to the lower surface, the container body 11 comprises a plurality of first baffles 11b, and an outlet 11c of the blow-by gas, the bottom lid body 12 comprises a plurality of second baffles 12b alternately forming a gas passage zigzag in the lateral and vertical directions with the first baffles 11b, and further comprises a gas inlet 12b near a side wall of the cylinder head C, and a drain through-hole 12c of the separated oil on the opposite side, further an enclosure frame body 13 totally covering the gas inlet 12b and extended to an end wall of the container body 11 is mounted on the lower side of the bottom lid body 12, a projecting collar piece 13a is mounted on an opening end of the enclosure frame body 13 for preventing the oil on a cylinder head H splashed up by a valve gear mechanism from coming into the container body 11, and only the atomized oil in the blow-by gas is treated in the separator S.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for separating oil from blow-by gas leaking into an engine, and more particularly to an improved separation apparatus for preventing extra oil particles from entering the apparatus.

[0002]

2. Description of the Related Art In a vehicle engine, in order to prevent air pollution, blow-by gas leaking into the engine is returned to an intake pipe again, and oil contained in the blow-by gas in a mist is separated. This is returned to the sliding part side of the engine.

FIGS. 4 to 6 show an example of an oil separating device S which is currently used. The oil separating device S is composed of a container body 1 having a predetermined volume and a bottom cover fixed to the lower surface thereof. The container body 1 is formed integrally with a cylinder head cover C (made of aluminum die-cast or synthetic resin such as polyamide or polyacetal) of the engine E, and the container body 1 is spaced from the ceiling wall 1a at a predetermined distance. As shown in FIG. 6, the head cover C has a plurality of first baffle plates 1b whose width is substantially equal to the inner width of the main body and which is shorter than the height of the main body so as to form a flow path on the lower side. An end near the center is provided with a gas outlet 1C connected to the intake pipe system.

On the other hand, the bottom cover 2 is provided with a plurality of second baffle plates 2b in a state of being staggered at a predetermined interval from the first baffle plate 1b of the container body 1, and is located at the center of the plurality of second baffle plates 2b. The height is substantially equal to the inside height of the container body 1 and the width is smaller than the inside width of the body 1 so as to form a flow path on one side or the other side as shown in FIG. On the other hand, the one on the downstream side is a perforated plate, and the one adjacent to the gas outlet 1C has a width almost equal to the inner width of the main body 1, the height is low and a flow path is formed at the upper part. In the center of the lower end of the baffle plate 2b and the porous baffle plate 2b, a through hole 2e for separating oil is provided. Also, blow-by gas flow holes 3 provided in the cylinder head H
Gas inlet 2a with a large opening area
And a drain through-hole 2 </ b> C for discharging separated oil is provided at an end near the gas flow hole 3. The first baffle plate 1b hanging down from the ceiling wall 1a of the container body 1 and the second baffle plate 2b rising from the bottom cover 2 make the blow-by gas flow in the container body 1 as shown by solid arrows in FIGS. And it is arranged so that it may flow in a zigzag manner up and down.

[0005] The cylinder head cover C is mounted on the cylinder head H of the engine E. The cylinder head cover C is mounted on the cylinder head H and includes a rocker arm a, a valve rod b, a cam C, a camshaft d and the like. While preventing dust from adhering, it forms a guide path for blow-by gas generated in the crankcase of the engine E. The blow-by gas generated in the flank case when the engine E is operating is driven by the positive pressure in the crankcase or the intake air. Under the influence of the negative pressure on the tube side, the gas flows through the gas flow hole 3 onto the cylinder head H, flows in the opposite direction, enters the main body 1 from the inlet 2a of the container main body 1, and has a plurality of 1, second baffle 1
b, 2b and moving while bending alternately left and right and up and down, the oil particles contained in the blow-by gas are separated, and the separated oil is drained through the drain hole 2.
The gas dropped from the cylinder C onto the cylinder head H and separated from the oil flows from the outlet 1C to the intake pipe via the hose member.

[0006]

In the above oil separating apparatus, the flow rate of the blow-by gas passing through the container body 1 is approximately 1 m / m, since it is necessary to efficiently separate the fine oil particles contained in the blow-by gas. The area of the inlet 2a of the bottom cover 2 is set to be large so as to be less than one second. When the oil particles are flipped up by the rod b, the cam C or the like, the oil particles easily enter through the inlet 2a, and when the engine itself is inclined as shown in FIG. The oil that jumps up and adheres flows in from the inlet 2a, and cannot be completely processed by the separation device, and flows out from the outlet 1C together with the blow-by gas. Cause of the increase in consumption.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent oil other than atomized oil particles contained in blow-by gas from entering into a container body of a separator during operation of an engine.

[0008]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention comprises a container body having a predetermined volume formed on an upper portion of a cylinder head cover and having an open lower surface, and a bottom lid fixed to the lower surface thereof. The main body has a plurality of first baffles hanging from a ceiling wall and is provided with a gas outlet, and the bottom lid body has a zigzag blow-by gas passage zigzag up and down and left and right alternately with the first baffles in the container main body. A plurality of second baffle plates, a gas inlet at a position close to the side wall of the cylinder head cover, and a device for separating oil in blow-by gas having an oil drain passage hole. An enclosing frame projecting downward from the section and extending toward the side wall of the cylinder head cover over the entire gas inlet is provided, and flange pieces are provided on both sides of the opening end and on the lower side. It is characterized in.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show an example of an oil separating apparatus according to the present invention. A container body 11 having a predetermined volume with an open lower surface is made of aluminum die-cast or made of polyamide, polyacetal or the like. It is formed integrally with a synthetic resin cylinder head cover C so as to protrude toward the side wall at one end thereof, and has a bottom cover 1 of the same material on its lower surface.
When 2 is made of synthetic resin, it is fixed by vibration friction welding, and when it is made of aluminum, it is fixed by brazing or screwing.

The container body 11 has a plurality of first baffle plates 11b each having a width substantially equal to the inner width of the container body 11 and being shorter than the height of the container body 11 and forming a flow path on the lower side. A blow-by gas outlet 11C is provided at the center end of the head cover C, which is vertically suspended from the ceiling wall 11b at intervals and connected to the intake pipe via a hose member (not shown).

On the other hand, the bottom cover 2 is located at the center and has a height substantially equal to the inner height of the container body 11 and a width of
A second baffle plate 12b which is smaller than the inner width of the main body and which is formed on one side or the other side, and which has a porous downstream side with respect to the gas flow; A second baffle plate 12b, which is substantially equal to the inner width of the container body and has a height lower than the main body 11c and forms an upper passage, is provided upright at a predetermined interval, and is provided on the container main body 11 side. The first baffle plate 11b and the second baffle plate 12b on the bottom cover 2 are arranged so as to be staggered from each other.
In FIG. 1, zigzag gas passages which alternately turn left, right, up and down are formed. At the center of the lower end of the second baffle plate 12b adjacent to the outlet 11C, a through hole 12e for separated oil is provided.

The bottom cover 12 has a gas inlet 12a having a large opening area at a position close to the side wall of the head cover C.
At the far end, a fine drain through-hole 12C having an oil reservoir 12d at the top is provided, and in the present invention, the bottom lid 12 projects downward from the lower central portion thereof to form a gas inlet 12a. An enclosure 13 is formed integrally and extends to the end wall of the container body 11 close to the side wall of the cylinder head cover C, and the open end of the enclosure 13 has both sides and a bottom as shown in FIG. A brim piece 13a is provided which protrudes to three sides.

Under such a configuration, when the engine E is operated, the blow-by gas leaked into the crankcase is provided in the cylinder head H under the influence of the positive pressure in the crankcase or the negative pressure on the intake pipe side. It flows out onto the cylinder head H through the flow hole, flows therethrough to the opposite side, and
To the opening end of the enclosing frame 13 provided on the lower side, enters the enclosing frame 13 as shown by a solid line arrow, further flows into the container body 11 from the inlet 12a of the bottom lid 12, and is disposed therein. The outlet 11 collides with the plurality of first and second baffle plates 11b and 12b provided and alternately bends left, right, up and down.
In the process of moving to the C side, the oil fine particles contained in the blow-by gas are separated, and the separated oil flows through the oil through-hole 12 e, and finally the oil provided on the bottom lid 12. Reservoir 12d and drain hole 1
The blow-by gas that has dropped from the nozzle 2C onto the cylinder head H as indicated by a dotted arrow and has run out of oil flows from the outlet 11c to the intake pipe side via a hose member.

On the other hand, the oil stored on the cylinder head H for lubricating the valve operating mechanism including the rocker arm a, the valve rod b, the cam c, the cam shaft d, etc. on the cylinder head H is supplied to the valve operating members. At this time, since the lower side of the inlet 12a of the bottom lid 12 of the oil separating device S is entirely covered by the surrounding frame 13, the oil particles which have been jumped up as before have Even if the engine E is inclined as shown in FIG. 3 without entering from the base 12a and the vehicle is climbing up a hill, the flange protruding outward on three sides at the open end of the surrounding frame 13 is provided. Since the piece 13a is provided, the oil adhering to the lower surface of the bottom lid 12 and the outer surface of the surrounding frame 13 is dripped downward along the flange piece 13a, and
a does not enter the container body 11.

The first baffle 11b provided on the container body 11 and the second baffle 1 provided on the bottom lid 12 are provided.
The shape and number of 2b are not limited to the illustrated example, and may be changed as appropriate as long as the blow-by gas can be alternately applied to the blow-by gas in the container body 11 in the left and right and up and down directions. As shown in FIG. 2, the gas inlet 12a of the bottom cover 12 and the drain hole 1
FIG. 2C shows an example in which the gas is provided to be offset in the width direction so as to obtain an effective zigzag flow of gas, but this may be a central portion, and the oil passage hole 12 of the second baffle plate 12b may be provided.
A plurality may be provided without providing e. The inlet 12a may be circular, elliptical, or the like. Container body 1
The one outlet 11C may be provided laterally to the axis of the cylinder head cover C. In the illustrated example, the oil separating device S is provided so as to be shifted to one side in the longitudinal direction of the cylinder head cover C.
The central portion may be used as long as the opening ends of 2a and the enclosing frame 13 approach the side wall of the head cover C. (In this case, the surrounding frame 13 is turned sideways.)

[0016]

Since the present invention is configured as described above as an apparatus for separating blow-by gas oil, the cylinder which is jumped up by the operation of a valve mechanism such as a rocker arm, a valve rod, or a cam when the engine is operating. Oil on the head can be reliably prevented from flowing through the gas inlet of the bottom lid, and even if the engine is tilted, the splashing oil attached to the lower surface of the bottom lid and the outer surface of the surrounding frame is removed. The collar allows the droplet to be properly dropped on the cylinder head, and the mist-like oil fine particles are properly processed to prevent engine malfunction.

[Brief description of the drawings]

FIG. 1 is a side sectional view taken along line XX of FIG. 2 showing an example of an oil separation device according to the present invention.

FIG. 2 is a partially cut front view taken along line WW of FIG. 1;

FIG. 3 is a cross-sectional view showing a state of the separation device when the engine is tilted.

FIG. 4 is a side sectional view of the entire cylinder head cover taken along the line ZZ of FIG. 5 showing a conventional separation device.

FIG. 5 is a sectional view taken along the line YY of FIG. 4;

FIG. 6 is a plan view of a conventional separation device.

FIG. 7 is a cross-sectional view of a conventional separation device showing a relationship with splash oil.

FIG. 8 is a sectional view showing a state of a conventional separation device when the engine is tilted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Container main body 11a Ceiling wall 11b 1st baffle board 11c Outlet 12 Bottom lid 12a Inlet 12b 2nd baffle board 12c Drain passage hole 13 Enclosure frame 13a Collar piece C Cylinder head cover E Engine H cylinder head

Claims (1)

[Claims] 1. A plurality of first baffles formed on an upper portion of a cylinder head cover and having a predetermined volume with an open lower surface and a bottom lid fixed to the lower surface thereof, the container body hanging down from a ceiling wall. Having a gas outlet, and the bottom lid body has a plurality of second baffle plates that form a zigzag blow-by gas passage alternately with the first baffle plate in the container body. In an oil separator having a gas inlet at a position close to the side wall of the cylinder head cover and having an oil drain hole, the cylinder head cover protrudes downward from the center of the bottom cover and covers the entire gas inlet. An apparatus for separating oil from blowby gas, comprising: an enclosing frame extending toward a side wall; and brim pieces protruding from both sides and a lower side of an opening end thereof.