JP3166335B2 - Compression liquefaction type oil mist condensation and separation equipment for internal combustion engines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for separating oil mist from blow-by gas in an overhead cam type internal combustion engine.

[0002]

2. Description of the Related Art In a conventional overhead cam (OHC) type internal combustion engine (engine) , FIGS.
As shown in, the cylinder head cover 6 by gas entering from the combustion chamber of the engine to the piston ring abutment portion in the crankcase 2 I through the is to increase the blow-by gas passage of the cylinder block 3 and cylinder head 4
Inside the PCV room 7 and several separators (baffle plates) 7 provided therein while flowing through the PCV room 7
1, where the mist-like oil is separated from the blow-by gas and falls to be collected in the oil pan 1.
It flows into the intake manifold 11 via the CV hose 10. In the figure, reference numeral 12 denotes an air cleaner.

[0003]

In the above method [SUMMARY OF THE INVENTION] Since the PCV room 7 have a limited space in the cylinder head cover 6, the contact area of the separator 71 is also constrained, in blow-by gas passing oil deficiency limits on the amount that adheres to the separator. Accordingly
Te, oil blow-by gas is large which flows into the intake manifold 11 exits until until in PCV room conditions that are not sufficiently removed. For this, the consumption of the engine oil is increased, in order that no air-fuel ratio appropriate, there is a problem that adverse effects occur in the power performance of the engine.

In order to solve the above-mentioned problem , the present invention has a means for sufficiently separating and collecting the oil contained in the blow-by gas before flowing into the intake manifold and collecting the oil in the oil pan before the blow-by gas flows into the intake manifold. The purpose is to provide.

[0005]

To achieve the above object, according to the solution to ## in the present invention, the overhead cam type internal combustion engine, Ya trochoid pump that will be <br/> rotation driven by the power that is output taken from the camshaft Vane pump etc.
A charge pump is disposed in the cylinder head cover, and blow-by gas flowing from the crankcase into the cylinder head cover is supplied to the trochoid pump or the vane pump.
With pumped by positive displacement pump into the intake manifold and the like, Tei contained in the blow-by gas in the
Pressurized engine oil mist more than its saturation pressure.
Compression liquefaction type that is forcibly condensed and liquefied by contraction, and can be separated and collected efficiently.
An oil mist condensation / separation device is provided.

[0006]

[Action] blowby gas flowing from the crankcase into the head cover has been Eject from the camshaft power
Trochoid pump or vane pump or the like which is rotated by
It is sucked into the positive displacement pump, the temperature at that time in the pump
It is compressed until the definitive saturation pressure or more depending on the Rukoto
Te, is liquefied by condensation is engine oil mist was Tei contained in the blow-by gas, Ru is discharged from the pump discharge opening in a state where the blow-by gas and the oil are separated. Liquefied oil is recovered via the oil drop hole to the oil pan, the blow-by gas that is removed oil Ru entering the intake manifold through the PCV hose. Thus saves wasteful consumption of the engine oil, also reduce adverse effect on the power performance of the engine.

[0007]

An embodiment of the present invention will be described with reference to the drawings. Shows the first embodiment of the present invention in FIGS. It is denoted by the same reference numerals common to those in FIG. 5 showing a conventional preceding example. Shows the cross sectional view of the embodiment in FIG. 1 in the figure
Is an oil pan, 2 is a crankcase, 3 is a cylinder block, 4 is a cylinder head, 5 is a camshaft, 6 is a cylinder head cover, 7 is a PCV room, and 71 is a separator. One end of the cam shaft 5 (the front end), volume
Trochoid pump 8, which is a kind of product type pump Ru <br/> attached. FIG. 2 shows the trochoid pump 8 shown in FIG.
FIG. 3 is an enlarged sectional view, and FIG. 3 is a sectional view taken along the line III-III of FIG. As shown, the drive rotor 81 of the trochoid pump 8 is press-fitted into the camshaft 5, and when the camshaft 5 rotates, the drive rotor 81 also rotates at the same time. Also,
The driven rotor 82 is in contact with the drive rotor 81 and is engaged so as to rotate with the rotation of the drive rotor 81 . De Ribunrota 82 against the trochoid pump body 83, inscribed as wear <br/> in free to rotate therein. The body 83 of the trochoid pump 8 includes the cylinder head 4 and the cylinder head cover 6.
, And the front end of the cylinder head cover 6 is sealed here.

[0008] PCV room 7, therein is divided into several compartments by the separator (baffle plate) 71
And which, blow-by gas collected in the cylinder head cover 6 rises from the crank case 2, the through Rutoki the PCV room 7 as indicated by arrows in FIG. 1 (→), where collides with the separator 71 separator 71 adhere to a certain amount of oil is trapped in the remaining oil mist into the trochoid pump 8 together with the blowby gas, inflow from the pump inlet. In the pump 8,
The drive rotor 81 is connected to the camshaft 5 as shown in FIG.
And rotate right (clockwise) . At this time the driven rotor 82 is also rotated clockwise by the drive rotor 81 and rotating together, thereby, the volume of the blow-by gas inlet portion 86 which is formed by the clearance between the drive rotor 81 and the driven rotor 82, illustrated in FIG. 2 86 than 861
Increase like 2 . Thereby, the low- by gas is sucked into the pump 8 , and the volume becomes maximum at 863 .
The volume is reduced, as shown at 864 . <br/> blowby gas because this is compressed Runode beyond its saturation pressure,
Oil mist in the blow-by gas (oil particles) is liquefied by condensation, Ru is discharged out of the pump from the pump discharge port 85 with the rest of the blow-by gas. Here liquefied oil, arrows from here through the oil drop hole 9 (- →)
The oil pan 1 falls into the crankcase 2 as shown in
Ru is recovered within. Further, the residual of the blow-by gas that is removed oil exits the pump discharge port 85, in the same manner as shown in FIG. 5, and flows into the intake manifold 11 through the PCV hose 10. In this case, the size of the PCV room 7 can be smaller than that of the conventional PCV room. Also, blow-by gas from the crankcase
There To prevent backflow, it may be provided a check valve in the oil drop hole 9.

FIG. 4 shows a second embodiment of the present invention. The first embodiment and are point Te embodiment smell are that abolished the PCV room provided in the upper portion of the cylinder head cover 6, there the capacity of the trochoid pump 8 in that increased correspondingly, otherwise Is the same as in the first embodiment. In the present embodiment, the blow-by gas that has flowed into the cylinder head cover 6 rises from the crank case 2, without removing the pre <br/> Me some oil by PCV room as in the first embodiment All enter the trochoid pump 8 directly , and in the process of being sucked and compressed therein, the oil mist in the blow-by gas is removed.
By condensation liquefied by discharging from the discharge port 85 of the trochoid pump 8 to the oil drop hole 9, the oil pan 1
The oil was collected to, flowing a remaining defatted blow-by gas into the PCV hose 10 (FIG. 5). Although in the illustrated embodiment has been shown the example of using the trochoid pump is a typical positive displacement pump, it is not limited to this, also becomes complicated mechanistically to use vane pump or the like it can.

[0010] In the present embodiment uses a large trochoid pump 8 volume than in the first embodiment, P
CV room 7 and the separator 71 therein device <br/> for the unnecessary becomes simple and compact.

[0011]

According to the present invention, the following effects can be obtained. (1) All trochoid pump before supplying blow-by gas in the cylinder head cover to the intake manifold
By flowing into and vane pump or the like of displacement in the pump, Toro
Positive displacement pumps such as coid pumps and vane pumps
By strongly compressed, so by liquefying oil mist collecting oil, less missed oil, collecting the oil Ru reliably performed. This saves oil consumption and reduces adverse effects on engine power performance. (2) The size of the head cover can be reduced because the conventional PCV room is reduced or eliminated.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line II-II of the trochoid pump shown in FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a sectional view of a main part of a second embodiment.

5A and 5B show a conventional apparatus for separating oil from blow-by gas in a blow-by gas, wherein FIG. 5A is a flow path diagram of a blow-by gas in an engine, and FIG.
It is a flow path figure before and behind a V room.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Oil pan 2 ... Crank case 5 ... Camshaft 6 ... Cylinder head cover 7 ... PCV room 8 ... Trochoid pump 9 ... Oil drop hole 10 ... PCV hose 11 ... Intake manifold 71 ... Separator (baffle plate) 81 ... Drive rotor 82 ... Driven Rotor

Claims (1)

(57) [Claims] 1. An overhead cam type internal combustion engine, comprising:
It rotated by Fetch been power from the camshaft (5)
Displacement <br/> pump trochoid pump or vane pump such that Ru-driven (8) disposed in the cylinder head cover (6) in the blow-by gas flowing into the cylinder head cover (6) in the crankcase (2) , Said Trokoi
While <br/> pumped into the intake manifold (11) by positive displacement pump, such as Doponpu or vane pump (8), the
Engine oil mist contained in the blow-by gas in, to strongly compressed above its saturation pressure
Forced by condensation liquefaction me, this to efficiently separate collection
Compressed liquefied oil mist coagulation configured to allow bets
Knot separating device .