JP3160511B2 - Blow-by gas extraction device for internal combustion engine - Google Patents

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 collected in a blow-by gas reservoir such as in a cylinder head cover of an internal combustion engine into an intake system for the internal combustion engine.

[0002]

2. Description of the Related Art Generally, when blow-by gas collected in a blow-by gas reservoir such as in a cylinder head cover is extracted into an intake system, excess blow-by gas is supplied to the intake system when the intake negative pressure in the intake system is large. It is necessary to regulate the flow rate so that it is not inhaled.

Therefore, conventionally, as described in, for example, Japanese Utility Model Application Laid-Open No. 2-37209, a flow restricting throttle is provided in the middle of a blow-by gas extraction pipe from a blow-by gas reservoir to an intake system. An orifice may be provided, or a metal socket tube for connecting a blow-by gas extraction pipe line to an intake system to a blow-by gas reservoir as described in Japanese Utility Model Application Laid-Open No. 62-162323. A throttle orifice for regulating the flow rate is provided at the tip, and this socket tube is inserted into the blow-by gas reservoir so that the tip with the throttle orifice of the socket tube projects into the blow-by gas reservoir.

[0004]

However, when the restricting orifice for regulating the flow rate is provided in the middle of the blow-by gas extraction line as in the former case, the blow-by gas in the blow-by gas extraction line is provided in the middle of the blow-by gas extraction line. As water easily accumulates,
When the operation of the internal combustion engine is stopped for a long time in winter, the throttle orifice in the middle of the blow-by gas extraction line not only becomes clogged due to the freezing of moisture, but also when the internal combustion engine is started, the throttle orifice is not closed. Since the temperature rise is slow, there is a problem that clogging due to freezing of the throttle orifice cannot be eliminated for a long time.

On the other hand, when the throttle orifice for regulating the flow rate is provided at the end of a socket tube inserted so as to protrude into the blow-by gas reservoir as in the latter case, the throttle orifice freezes moisture. Although the occurrence of clogging can be reduced as compared with the former case, since the socket tube is made of metal, heat transfer from the socket tube to the cylinder head cover is rapid, and the temperature rise is slow. Therefore, once the throttle orifice is clogged by freezing of water, not only does it take a long time until the clogging of the throttle orifice due to the freezing of water is cleared by the start of the internal combustion engine, but also the throttle orifice is blow-by. Oil mist that opens directly into the gas reservoir and scatters into the blow-by gas reservoir is Because they become directly contact structure easy to, oil mist extracted from restrictive orifice with blow-by gas is large, there is a problem that the consumption of lubricating oil is large.

An object of the present invention is to solve these problems.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above technical object, the present invention provides a method for connecting a blow-by gas extraction pipe line to an intake system to a blow-by gas reservoir with a flow rate at the end of a socket pipe. In a blow-by gas extraction device in which a restricting orifice is provided and this socket tube is inserted into the blow-by gas reservoir so that the tip of the socket tube projects into the blow-by gas reservoir, the socket tube is synthesized. On the other hand, at the tip of the socket tube, an oil mist shielding member formed in a cylindrical shape so as to surround the throttle orifice such that the oil mist shielding member protrudes into the blow-by gas reservoir from the throttle orifice. Are provided integrally. "

[0008]

As described above, the socket pipe for connecting the blow-by gas extraction conduit to the intake system to the blow-by gas reservoir is made of synthetic resin having a lower heat transfer coefficient than metal. Since the blow-by gas reservoir forming member such as the cylinder head cover does not easily escape heat from the socket tube, the temperature of the throttle orifice rapidly rises when the internal combustion engine is started.

At the tip of the socket tube, an oil mist shielding member formed in a cylindrical shape so as to surround the throttle orifice is integrally formed so that the oil mist shielding member projects into the blow-by gas reservoir from the throttle orifice. The oil mist scattered in the blow-by gas reservoir can be reliably reduced by the oil mist shielding member from directly hitting the throttle orifice, so that the oil mist is sucked into the throttle orifice together with the blow-by gas. The amount of oil mist that is generated is greatly reduced.

Therefore, according to the present invention, even if the throttle orifice is clogged by the freezing of water while the operation of the internal combustion engine is stopped, the clogging due to the freezing can be eliminated in a short time after the start of the internal combustion engine. On the other hand, the lubricating oil that disappears with the extraction of the blow-by gas is significantly reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In this figure,
Reference numeral 1 denotes an internal combustion engine comprising a cylinder block 2, a cylinder head 3 fastened to the upper surface of the cylinder block 2, and a cylinder head cover 4 fastened to the upper surface of the cylinder head 3. An intake manifold 5 is mounted on a side surface, and a carburetor 6 having a throttle valve 7 is attached to the intake manifold 5.

The cylinder head cover 4 is configured to collect blow-by gas generated in a crankcase (not shown) at the lower portion of the cylinder block 2 and the cylinder head 3, and to collect air generated by the blow-by gas. A liquid separation chamber 8 is formed. Reference numeral 9 denotes a blow-by gas extraction pipe for extracting blow-by gas in the gas-liquid separation chamber 8 in the cylinder head cover 4 to the intake manifold 5, and reference numeral 10 denotes
Socket pipes for connecting one end of the blow-by gas extraction pipe 9 to the cylinder head cover 4;
The socket tube 10 is detachably inserted into an elastic grommet 11 such as rubber provided on the cylinder head cover 4 such that the tip of the socket tube 10 projects into the gas-liquid separation chamber 8. I have.

The socket tube 10 is made of a heat-resistant synthetic resin, and is provided with a throttle orifice 12 at the tip thereof, and an oil mist shielding member 13 formed in a cylindrical shape so as to surround the throttle orifice 12. An oil mist shielding member 13 is integrally provided so as to protrude into the gas-liquid separation chamber 8 beyond the throttle orifice 12. As described above, since the socket tube 10 is made of a synthetic resin having a lower heat transfer coefficient than a metal, a structure in which heat cannot escape from the socket tube 10 to the cylinder head cover 4 can be provided. During the start-up, the temperature of the portion of the throttle orifice 12 rises rapidly.

An oil mist shielding member 13 formed in a cylindrical shape so as to surround the throttle orifice 12 is provided at the end of the socket tube 10. The oil mist shielding member 13 is located in the gas-liquid separation chamber 8 more than the throttle orifice 12. The oil mist scattered in the gas-liquid separation chamber 8 can be reliably reduced by the oil mist shielding member 13 from directly hitting the portion of the throttle orifice 12. Therefore, the amount of oil mist sucked into the throttle orifice 12 together with the blow-by gas is reduced.

In the above embodiment, the cylinder head cover 4 is used as a blow-by gas reservoir and a socket tube 10 for connecting the blow-by gas extraction pipe 9 is inserted into the cylinder head cover 4. Is not limited to this, when the crankcase at the lower part of the cylinder block 2 is used as a blow-by gas reservoir,
It goes without saying that the present invention is also applicable to a case where the socket tube 10 is inserted into the crankcase.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a socket tube used in the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Cylinder block 3 Cylinder head 4 Cylinder head cover 5 Intake manifold 6 Vaporizer 8 Gas-liquid separation chamber for blow-by gas 9 Blow-by gas extraction pipeline 10 Socket pipe 12 Throttle orifice 13 Oil mist shielding member

Claims (1)

(57) [Claims] A throttle orifice for regulating a flow rate is provided at a tip of a socket for connecting a blow-by gas extraction pipe line to an intake system to a blow-by gas reservoir, and the socket pipe is connected to the blow-by gas reservoir. In the blow-by gas extracting device, the tip of the socket tube is inserted so that the tip of the socket tube projects into the blow-by gas reservoir, the socket tube is made of synthetic resin, while the throttle orifice is attached to the tip of the socket tube. An oil mist shielding member formed in a cylindrical shape so as to surround the blow-by gas in the internal combustion engine, wherein the oil mist shielding member is integrally provided such that the oil mist shielding member protrudes into the blow-by gas reservoir from the throttle orifice. Extraction device.