JPH04234512A - Oil separator structure for engine - Google Patents

Abstract

PURPOSE:To surely remove oil, mixed into a blow-by gas, in the course of a pipe line in which the blow-by gas in an engine is made reflux to an engine intake system. CONSTITUTION:A centrifugal separator 10, composed by linking a rotary body 15 in the inside of an oil-gas mixing tube 12 to an engine cam shaft 7, is provided on the oil-gas mixing tube 12 communicated with an engine inside. An oil tube 14 for recovering oil B is arranged on a wall surface of the centrifugal separator 10, an oil-gas mixture A is sucked by negative pressure of an intake system to come in contact with the rotatable rotary body 15, and the oil B having large mass is neared to outside by centrifugal force to flow the oil B into the oil tube 14 to be separated from a blow-by gas C.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil separator structure for engines of automobiles, motorcycles, etc., which have a blow-by gas recirculation device.

0002

[Prior Art] Conventionally, blow-by gas generated in the crankcase during the compression stroke and explosion stroke of an automobile engine is returned to the engine intake system to prevent it from being released into the atmosphere. Some are equipped with a blow-by gas recirculation device that communicates with the engine's intake system. The engine intake system is an air cleaner,
Since the surge tank is connected to the intake manifold, the output port of the blow-by gas reducing device is opened to the air cleaner or the surge tank. generally,
This device is forced to work using the negative pressure inside the intake manifold by opening the surge tank.

On the other hand, an oil pan is provided at the bottom of the crankcase of an engine mounted on a vehicle, and oil is stored therein to lubricate the inside of the cylinder. The oil pan is shaped with a deep recess or a partition plate is installed so that there is enough oil even when the car body is tilted, and when the car is stopped suddenly, the oil waves and the oil pump is filled with oil. This prevents them from not sending any more.

[0004] Therefore, the blow-by gas generated inside the crankcase or head cover usually contains
Engine oil is mixed in. Therefore, it is necessary to separate the oil and blow-by gas before reburning. For example, Japanese Utility Model Publication No. 63-37466 discloses that a porous oil partition plate, wire mesh, etc. is installed in the filter unit in the middle of the passage inside the head cover.
Further, Japanese Utility Model Publication No. 64-3767 discloses that a shutter is provided to prevent separated oil from moving due to movement of the vehicle body and being returned together with blow-by gas.

[0005]

[Problem to be solved by the invention] However, minute oil passes through porous partition plates, wire mesh, etc., and oil and gas separation is not complete, and depending on operating conditions, oil may flow into the intake system. .

SUMMARY OF THE INVENTION In order to solve the above problems, it is an object of the present invention to provide an oil separator structure for an engine that uses centrifugal force to separate oil and gas.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an oil/gas mixture pipe that is installed alongside an engine intake system and communicates with the interior of the engine and the intake system, and is connected to a camshaft of the engine. A rotary body fixed to a shaft is provided so as to be rotatable around the direction of the oil/gas mixture pipe, and a centrifugal separator is provided so as to block the oil/gas mixture pipe. The oil pipe is characterized in that a hole communicating to the rear is formed and an oil pipe is opened in the wall surface of the oil/gas mixture pipe near the rotating body.

[0008]

[Operation] By having the above structure, the rotating body of the centrifugal separator provided in the middle of the blow-by gas passage can be rotated via the shaft that transmits the rotation of the engine, and the mixture passing through the blow-by gas passage can be rotated. When the gas comes into contact with the rotating body, the mixed oil can be dropped onto the wall surface by centrifugal force. Since an oil passage is opened in the wall surface, oil flows from there and is collected. Further, blow-by gas is taken in through the vent hole and returned to the engine intake system.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 3, a surge tank 3 is provided between the throttle body 1 and intake manifold 2 of the intake system to prevent intake pulsation, and inside the throttle body 1 there is a surge tank 3 that adjusts the opening of the passage. A throttle valve 4 is attached, and the intake manifold 2 is branched and communicated with each cylinder of the engine 5. A crankshaft (not shown) connected to a piston in the cylinder transmits its rotation via a pulley 6 and the like to a camshaft 7 located on the cylinder head. Further, the exhaust system of the engine 5 is connected to an exhaust manifold 8 and an exhaust pipe (not shown).

On the other hand, the blow-by gas recirculation device is equipped with a centrifugal separator 10 through which a shaft 9 connected to the camshaft 7 is inserted, and this centrifugal separator 10 is communicated with the inside of the head cover 11 on the upper part of the engine 5. Mixture pipe 12
Further, a centrifugal separator 10, a blow-by gas pipe 13 communicating with the surge tank 3, and an oil pipe 14 communicating with an oil reservoir are arranged.

As shown in FIGS. 1 and 2, a centrifugal separator 10
The interior of the is partitioned by a rotating body 15 fixed to the shaft 9, a mixture air pipe 12 is connected to the side wall of the shaft 9, and a partition plate 16 with a hole 16a in the center is provided on the opposite side of the partition. A blow-by gas pipe 13 is connected. An oil pipe 14 is connected to the bottom of the wall in front of the partition plate 16. The rotating body 15 is a disk plane part 17
A plurality of holes 17a are bored in the outer periphery, and a plurality of oil holes 1 are formed in the outer periphery.
A cylindrical wall portion 18 having holes 8a arranged therein is arranged in the front-rear direction. In addition, the holes 16a drilled in the partition plate 16 and the holes 17a drilled in the disc flat part 17 are arranged so that their positions are shifted from each other, and the oil holes 18a are arranged in the front and back discs of the disc flat part 17. They are arranged so that they touch the plane. Note that the shape and arrangement of the holes 16a and 17a may be determined experimentally as appropriate since the recirculation device utilizes the negative pressure of the intake manifold 2.

As described above, the centrifugal separator 10 installed in the blow-by gas recirculation device can rotate the rotary body 15 by the rotation of the engine 5, and the centrifugal separator 10 can rotate the rotary body 15 by the rotation of the engine 5. can be accommodated. Then, the air-fuel mixture (indicated by arrow A) entering from the air-fuel mixture pipe 12 collides with the rotating body 15, and the oil having a large mass (indicated by arrow B) moves toward the outer circumference due to centrifugal force. Thereafter, the oil is returned to the oil pan through the oil passage 14 along the wall surface. Further, blow-by gas (indicated by arrow C) having a mass smaller than oil passes through the holes 17a and 16a and passes through the blow-by gas passage 13.
It is guided into the surge tank 3 and absorbed into the engine 5 again. Therefore, since this reflux device has a structure in which the air-fuel mixture is captured by the rotating body 15, oil and blow-by gas can be separated more reliably than in the prior art, and combustion conditions can be improved.

FIG. 4 shows another embodiment. The rotating body 19 in this case consists of two discs 20, which are cut and folded at appropriate locations to form notches 21 and upright plates 22. By positioning the notches 21 at positions shifted from each other, the air-fuel mixture does not escape directly to the rear, and the upright plate 22 can strengthen the degree of contact between the disc 20 and the air-fuel mixture.

[0014]

[Effects of the Invention] Since the present invention is constructed as described above, the rotating body required for the centrifugal separator is rotated by transmitting the rotation of the camshaft, so that the drive motor for the rotating body is not required. A centrifugal separator can be easily constructed without using a conventional method. Additionally, the use of a centrifugal separator ensures separation of oil and blow-by gas, improving engine efficiency.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an oil separator structure according to an embodiment of the present invention.

FIG. 2 is a perspective view of a rotating body of an oil separator according to an embodiment of the present invention.

FIG. 3 is a plan view of an intake system of an engine according to an embodiment of the present invention.

FIG. 4 is a perspective view of a rotating body of an oil separator according to another embodiment of the present invention.

[Explanation of symbols]

5 Engine 7 Camshaft 9 Shaft 10 Centrifugal separator 12 Oil/gas mixture pipe 14 Oil pipe 15 Rotating body 17a Hole 19 Rotating body 21 hole

Claims (1)

[Claims] Claim 1: A rotating body fixed to a shaft connected to a camshaft of the engine is attached to an oil/gas mixture pipe that is installed alongside an engine intake system and communicates with the inside of the engine and this intake system. A centrifugal separator is provided so as to be rotatable around the direction of the rotary body, and a centrifugal separator is arranged to block the oil/gas mixture pipe. -An engine oil separator structure characterized by an oil pipe opening on the gas mixture pipe wall.