JPH1181973A - Blow-by gas extraction device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the suction of lubricating oil to a blow-by gas passage by forming an upper end of an oil filler with a large diameter part, installing an oil filler cap in the large diameter part of the oil filler, and projecting an opening part of a blow-by gas depositing pipeline, which is opened in a cap, downward from a ceiling surface inside of the cap. SOLUTION: An upper end of an oil filler 5 projected upward from a head cover of a vertex part of an internal combustion engine is formed with a large diameter part 5a, and an oil filler cap 6 made of rubber or the like is installed in this large diameter part 5a freely to be disconnected. This cap 6 is formed into a hollow body opened in the oil filler 5, and connected to an intake manifold 4 through a blow-by gas passage 8, and an L-shaped blow-by gas extraction pipeline 7 is installed in the cap 6. At this stage, an opening part 7a formed in one end of the extraction pipeline 7 is projected downward by an appropriate dimension S from the ceiling surface 6a the cap 6. Suction of the lubricating oil adhered to the inner surface of the cap 6 to the blow-by gas passage 8 is thereby prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for extracting blow-by gas in a head cover on a top surface of an internal combustion engine from a removable oil filler cap for an oil filler provided on the head cover. .

[0002]

2. Description of the Related Art Extraction of blow-by gas in a head cover from an oil filler cap which is detachable from an oil filler provided on the head cover as described above is disclosed in Japanese Utility Model Application Publication No. No. -30406. However, although the baffle plate for catching the lubricating oil mist is provided inside the oil filler cap, the blow-by gas extraction port from the inside of the oil filler cap is located inside the oil filler cap. The lubricating oil attached to the inner surface of the oil filler cap is sucked out together with the blow-by gas by jumping up from the head cover through the oil filler and blow-by gas. There was a problem that much lubricating oil disappeared with the gas.

In particular, in a slant type internal combustion engine in which an internal combustion engine is mounted on a vehicle at an angle, a large amount of lubricating oil jumps from the inside of the head cover to the inside of the oil filler toward the oil filler cap. Since the amount of lubricating oil adhering to the inner surface of the cap increases, the lubricating oil adhering to the inner surface of the oil filler cap disappears together with the blow-by gas, as described above, more remarkably.

An object of the present invention is to solve this problem.

[0005]

In order to achieve this technical object, the present invention provides an oil filler cap detachably mounted on an oil filler projecting upward from a head cover in an internal combustion engine. In a blow-by gas extraction device configured by connecting a blow-by gas extraction pipe to the oil filler cap, the upper end of the oil filler is formed in a large-diameter portion. While the oil filler cap is removably attached to the portion, the opening of the blow-by gas extraction conduit into the oil filler cap projects downward from the ceiling surface in the oil filler cap. " did.

[0006]

As described above, the upper end of the oil filler is formed in the large diameter portion, and the oil filler cap is detachably attached to the large diameter portion. When the lubricating oil that jumps toward the filler cap reaches the inside of the large-diameter portion at the upper end of the oil filler, the speed of the lubricating oil decreases, and the oil rapidly falls. Oil is significantly reduced, and in addition to this, an opening into the oil filler cap in the blow-by gas extraction line,
By protruding downward from the ceiling surface in the oil filler cap, it is possible to prevent the lubricating oil adhering to the inner surface of the oil filler cap from being sucked into the blow-by gas passage.

Therefore, according to the present invention, when the blow-by gas in the head cover is extracted from the oil filler cap for the oil filler, the lubricating oil that disappears together with the blow-by gas is reduced even in the case of a slant type internal combustion engine. It has the effect of being able to reliably reduce it.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. In this figure, reference numeral 1 denotes an internal combustion engine mounted on a vehicle.
Is configured as a slant type in which the axis 1a of the cylinder bore is inclined at an appropriate angle θ with respect to the horizontal line 3 when viewed from the axial direction of the crankshaft 2, and an intake manifold 4 for the internal combustion engine 1 is provided on the upper surface thereof. Have been.

Reference numeral 5 denotes an oil filler projecting upward from the head cover 1b at the top of the internal combustion engine 1. The upper end of the oil filler 5 is formed in a large-diameter portion 5a. The oil filler cap 6 made of a soft elastic material such as is detachably mounted. The oil filler cap 6 is formed as a hollow body that opens into the oil filler 5, while the blow-by gas extraction pipe 7 formed in an L shape with a synthetic resin is connected to the oil filler cap 6 with respect to the oil filler cap 6. The blow-by gas extraction pipe 7 is mounted such that an opening 7a at one end thereof protrudes downward by an appropriate dimension S from a ceiling surface 6a on the inner surface of the oil filler cap 6.

[0010] The other end of the blow-by gas extraction pipe 7 is connected to the intake manifold 4 via a blow-by gas passage 8. The blow-by gas extraction pipe 7 is attached to the oil filler cap 6 by:
After inserting one end of the blow-by gas extraction pipe 7 into a hole 6b formed in the oil filler cap 6 and inserting the same, a retaining portion 7b provided at one end thereof is fitted with a ceiling surface 6a on the inner surface of the oil filler cap 6. In this case, a groove 6c is provided on the upper surface of the oil filler cap 6,
By fitting a part or the front of the blow-by gas extraction pipe 7 into the groove 6c, the height of the blow-by gas extraction pipe 7 protruding from the upper surface of the oil filler cap 6 is reduced or not protruded. In addition, the blow-by gas extraction pipe 7 is provided with a throttle orifice 7c for regulating the amount of blow-by gas extracted at a bent portion in the middle thereof, so that the throttle orifice 7c is provided. It is configured so that it can be molded with a synthetic resin.

As described above, the upper end of the oil filler 5 is formed in the large-diameter portion 5a, and the oil filler cap 6 is detachably attached to the large-diameter portion 5a. The lubricating oil that passes through the oil filler cap 6 and jumps toward the oil filler cap 6 has a low speed when it reaches the large-diameter portion 5a at the upper end of the oil filler 5 and falls rapidly. Lubricating oil adhering to the inner surface of the cap 6 can be significantly reduced.

An opening 7a in the blow-by gas extraction line 7 into the oil filler cap 6
Is projected downwardly from the ceiling surface 6a in the oil filler cap 6 by an appropriate dimension S, thereby reliably avoiding suction of lubricating oil adhering to the inner surface of the oil filler cap 6 into the blow-by gas extraction passage 7. be able to.

The oil filler cap 6 has
By providing an annular protrusion 6d that forms an annular gap between the oil filler 5 and the inner surface of the large diameter portion 5a, the inner surface of the oil filler 5 and the large diameter portion 5a are formed.
The lubricating oil rising along the inner surface of the oil filler cap 6 is transmitted to the inner surface of the oil filler cap 6.
The effect of the present invention can be further promoted because it can be prevented by d.

[Brief description of the drawings]

FIG. 1 is a side view of an internal combustion engine.

FIG. 2 is a vertical sectional front view showing the embodiment of the present invention.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a diagram showing a disassembled state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Slant type internal combustion engine 1b Head cover 2 Crankshaft 4 Intake manifold 5 Oil filler 5a Large diameter portion of oil filler 6 Oil filler cap 6a Ceiling surface in oil filler cap 7 Blow-by gas extraction pipeline 7a Opening

Claims (1)

[Claims] An oil filler cap removably attached to an oil filler projecting upward from a head cover in an internal combustion engine is formed as a hollow body opened into the oil filler. In a blow-by gas extraction device connected to a gas extraction pipe, an upper end of the oil filler is formed in a large-diameter portion, and the oil filler cap is detachably attached to the large-diameter portion. An apparatus for extracting blow-by gas in an internal combustion engine, wherein an opening in the oil filler cap in the extraction pipe projects downward from a ceiling surface in the oil filler cap.