JPH0313524Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is an internal combustion engine whose crank bore axis is inclined with respect to a horizontal plane when viewed from the direction of the crankshaft. The present invention relates to a device for separating oil contained therein and discharging it to a blow-by gas processing section such as an intake manifold.

[Conventional technology]

Utility Model Application Publication No. 56-149013 as a prior art,
A gas-liquid separation case having an outlet port for blow-by gas is provided on the cylinder head cover of an internal combustion engine in which the cylinder bore axis when viewed from the direction of the crankshaft is inclined with respect to the horizontal plane. A blow-by gas extraction device is proposed which is provided with a blow-by gas inlet port that communicates the upper chamber of the head with the inside of the gas-liquid separation case.

In this case, the blow-by gas outlet port in the gas-liquid separation case is installed at the highest position in order to minimize the oil contained in the blow-by gas flowing out from the blow-by gas outlet port. The blow-by gas inlet port is provided at a location lower than the blow-by gas outlet port in order to keep the separated oil as far away from the blow-by gas outlet port as possible.

[The problem that the idea attempts to solve]

However, when an internal combustion engine installed in an automobile is viewed from the direction of the crankshaft, and the crank bore axis is inclined with respect to the horizontal plane, oil tends to accumulate in the upper chamber of the cylinder head of the internal combustion engine. When a car equipped with the internal combustion engine turns, the oil level may temporarily rise to the upper chamber due to centrifugal force during the turn. Providing the blow-by gas inlet port at a low location often causes oil to flow into the gas-liquid separation case from the blow-by gas inlet port when the car turns, increasing oil consumption and reducing exhaust gas. There was a problem in that it caused problems such as deterioration of the temperature.

The present invention aims to solve this problem.

[Means to solve the problem]

In order to achieve this object, the present invention provides a gas-liquid separation case in the cylinder head cover of an internal combustion engine in which the cylinder bore axis when viewed from the direction of the crankshaft is inclined with respect to the horizontal plane. A blow-by gas outlet port is provided at the highest part of the gas-liquid separation case, while a blow-by gas is provided at a part of the bottom plate of the gas-liquid separation case lower than the outlet port, which communicates the upper chamber of the cylinder head with the inside of the gas-liquid separation case. In a blow-by gas extraction device provided with a gas inlet port, a cover is provided on the bottom plate of the gas-liquid separation case so that the blow-by gas inlet port communicates with the upper chamber at a portion higher than the blow-by gas inlet port. The structure was designed to provide the following.

[Functions and effects of the idea]

With this configuration, even though the blow-by gas inlet port into the gas-liquid separation case is located at a lower location than the blow-by gas outlet port, A portion higher than the blow-by gas inlet port communicates with the upper chamber of the cylinder head.

Therefore, according to the present invention, when the oil level rises to the upper chamber of the cylinder head due to turning of the car, etc., the gas-liquid separation system prevents the oil from flowing into the gas-liquid separation case from the blow-by gas inlet port. The existence of a cover for the blow-by gas inlet port into the case can prevent problems such as increased oil consumption and deterioration of exhaust gas caused by the rise in the oil level in the upper chamber of the cylinder head. It has the effect of ensuring prevention.

〔Example〕

Hereinafter, an embodiment of the present invention will be explained with reference to the drawings. In the drawings, reference numeral 1 indicates that the cylinder bore axis 3 when viewed from the direction of the crankshaft 2 is inclined by an appropriate angle (θ) with respect to the horizontal plane 4. The internal combustion engine 1 includes a cylinder block 5 having an oil pan 6 and a crankcase at the bottom, a cylinder head 7 attached to the upper surface of the cylinder block 5,
and a cylinder head cover 9 that covers the upper chamber 8 of the cylinder head 7. An air cleaner 12 is connected to a carburetor 11 attached to the intake manifold 10.

Inside the upper chamber 8 of the cylinder head 7 are camshafts 1 for the intake and exhaust valves of each cylinder.
The cylinder block 5 and cylinder head 7 have a longitudinal centerline 17 parallel to the crankshaft 2 passing through the center of each cylinder. A blow-by gas passage 18 with a large cross-sectional area communicates between the bottom of the upper chamber 8 and the crankcase on one high side thereof, and the bottom of the upper chamber 8 and the crankcase on the other low side with the longitudinal centerline 17 interposed therebetween. Two oil drop holes 19 with small cross-sectional areas are provided, respectively, to communicate with each other.

Ceiling plate 9 in the cylinder head cover 9
In a, a bottom open type gas-liquid separation case 20 is integrally molded, and a bottom plate 21 for sealing the gas-liquid separation case 20 is attached to the bottom open part of the gas-liquid separation case 20. The inside of the gas-liquid separation chamber 22
to form.

The gas-liquid separation case 20 is provided with a blow-by gas outlet port 23 at its highest portion, and the blow-by gas outlet port 23 is connected to the blow-by gas from the air cleaner 12 or the intake manifold 10 through a blow-by gas extraction passage 29. A blow-by gas inlet port 24 is provided on the bottom plate 21 of the gas-liquid separation case 20 at a location lower than the blow-by gas outlet port 23 and connected to the processing section.

In the gas-liquid separation chamber 22, a plurality of jam plates 25 are provided to form a zigzag passage from the blow-by gas inlet port 24 to the blow-by gas outlet port 23.

A cover 26 having a U-shaped cross section is provided on the lower surface of the bottom plate 21 of the gas-liquid separation case 20, and the cover 26 allows the blow-by gas inlet port 24 to be connected to a portion higher than the blow-by gas inlet port 24. The upper surface chamber 8 is configured to communicate with the inside of the upper surface chamber 8.

With this configuration, the blow-by gas inlet port 24 communicates with the upper chamber 8 at a higher portion than the blow-by gas inlet port 24 due to the presence of the cover 26, so that when the automobile turns, etc., the oil pan 6 Even if the oil level in the upper chamber 8 rises due to the oil spouting up into the upper chamber 8 from the oil drop hole 19, the oil will flow into the gas-liquid separation case 20 from the blow-by gas inlet port 24. It is possible to reliably prevent a large amount of water from flowing into the water.

Furthermore, in the case where oil is supplied to the internal combustion engine 1 from the oil filler 27 provided on the cylinder head cover 9, if the cover 26 is not provided, the oil surface in the upper chamber 8 will drop to the blow-by gas inlet port as the oil is supplied. 24, air escape from the blow-by gas inlet port 24 is blocked, making it difficult to supply oil from the oil filler 27. However, by providing the cover 26 as described above, Since it is possible to prevent air from being blocked from flowing out from the blow-by gas inlet port 24 during refueling, refueling from the oil filler 27 can be easily performed.

Note that the cover 26 has a small hole 28 formed at its lowest position. This small hole 28 is
This is to release the oil separated in the gas-liquid separation case 20 to the upper chamber 8, and the oil level in the upper chamber 8 rises during operation of the internal combustion engine, such as when a car turns. Since this is for a relatively short period of time, the presence of the small holes 28 prevents a large amount of oil from flowing into the gas-liquid separation case 20.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional front view of the main parts of the internal combustion engine, Fig. 2 is a side view of the entire internal combustion engine, and Fig. 3 is an enlarged plan view partially cut away from Fig. 2. FIG. 4 is an enlarged cross-sectional view taken from the side in FIG. 1. DESCRIPTION OF SYMBOLS 1... Internal combustion engine, 2... Crankshaft, 3... Cylinder bore axis, 4... Horizontal surface, 5... Cylinder block, 7... Cylinder head, 8... Top chamber, 9... Cylinder head cover, 18... ...Blow-by gas passage, 19...Oil drop hole, 20...
... Gas-liquid separation case, 21 ... Bottom plate, 23 ... Blowby gas outlet port, 24 ... Blowby gas inlet port, 26 ... Cover, 29 ... Blowby gas extraction passage.

Claims (1)

[Scope of utility model registration request] A gas-liquid separation case is provided on the cylinder head cover of an internal combustion engine in which the cylinder bore axis when viewed from the direction of the crankshaft is inclined with respect to the horizontal plane, and a blow-by gas outlet port is provided at the highest part of the gas-liquid separation case. While providing
In the blow-by gas extraction device, a blow-by gas inlet port is provided in a bottom plate of the gas-liquid separation case at a portion lower than the outlet port, the blow-by gas inlet port communicating between the upper chamber of the cylinder head and the inside of the gas-liquid separation case. A blow-by gas in an internal combustion engine, characterized in that a cover is provided on the bottom plate of the gas-liquid separation case so that the blow-by gas inlet port communicates with the upper chamber at a position higher than the blow-by gas inlet port. Output device.