JP2585452Y2 - Blow-by gas processing device for vehicular 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 sucking blow-by gas from a cylinder head cover of an internal combustion engine mounted on a vehicle into an intake system of the internal combustion engine for processing.

[0002]

2. Description of the Related Art Generally, blow-by gas in a cylinder head cover is processed by sucking it through a blow-by gas passage into a portion of an intake system downstream of a throttle valve. In the low-load operation range where the opening degree is small, a large amount of blow-by gas and air is sucked into the intake system via the blow-by gas passage, so that rotation in the low-load operation range becomes unstable. Inside, a PCV valve that operates so as to reduce the cross-sectional area of the blow-by gas passage when the intake negative pressure downstream of the throttle valve becomes larger on the vacuum side is provided to stabilize in a low load operation range. I'm trying.

However, since blow-by gas or air containing moisture flows in the blow-by gas passage, water accumulates inside the PCV valve in the blow-by gas passage, and this water freezes in winter. And the PC
A malfunction will occur in the V-valve. Therefore, Japanese Utility Model Application Laid-Open No. 61-122313 as a prior art discloses PCV.
The prevention of freezing by providing an electric heater in the valve is described in Japanese Patent Laid-Open Publication No.
No. 710 proposes to prevent freezing by spraying a lubricating oil in an internal combustion engine on a PCV valve.

[0004]

However, as in these prior arts, an electric heater is provided for the PCV valve,
The configuration in which the lubricating oil is sprayed not only increases the cost but also increases the power loss in the internal combustion engine. The present invention is based on the point that, in recent vehicles, an internal combustion engine with an exhaust turbocharger is used, and the internal combustion engine is mounted at an angle in order to reduce the height of the vehicle body. It is an object of the present invention to take note of this fact and to reliably reduce the occurrence of freezing in the PCV valve by utilizing this fact.

[0005]

SUMMARY OF THE INVENTION In order to achieve this technical object, the present invention provides a vehicle having an internal combustion engine equipped with an exhaust turbocharger, wherein an axis of a cylinder bore of the engine is positioned on a horizontal plane with respect to a crankshaft direction. The exhaust turbocharger is mounted on the cylinder head cover of the internal combustion engine such that a part of the exhaust turbocharger laterally protrudes from the top surface of the cylinder head cover. On the other hand, a PCV valve provided in a blow-by gas passage from the cylinder head cover to the intake system is provided on the upper surface side of the cylinder head cover in the internal combustion engine and at a position substantially directly above the exhaust turbocharger. And the PCV valve is arranged to protrude laterally from the top surface of the cylinder head cover. "

[0006]

[Operation] With this configuration, the air warmed near the exhaust turbocharger rises by convection, and the air warmed near the exhaust turbocharger is disposed at a position almost directly above the exhaust turbocharger.
It will hit the CV valve, in other words, the PCV valve will
The PCV valve is warmed by the radiant heat transmitted from the exhaust turbocharger to the PCV valve by being heated by the air having a high temperature near the exhaust turbocharger. From
Freezing of the PCV valve can be reliably reduced.

[0007]

That is, the present invention prevents the freezing of the PCV valve by the heat of the exhaust turbocharger, so that the cost required to prevent the freezing of the PCV valve can be greatly reduced and the freezing prevention can be achieved. This has the effect of not causing a loss of output in the internal combustion engine.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In the figure, reference numeral 1 denotes a multi-cylinder internal combustion engine having a cylinder head cover 3 on the upper surface of a cylinder head 2,
The internal combustion engine 1 is mounted on a vehicle (not shown) with the axis 4 of the cylinder bore as viewed from the direction of the crankshaft 1a inclined at an appropriate angle θ with respect to a horizontal plane 5, On the upper surface side of the internal combustion engine 1, an intake manifold 6 for each cylinder is provided.

Reference numeral 7 denotes an exhaust turbocharger including an exhaust turbine 8 and a blower compressor 9, and the exhaust turbocharger 7 is disposed at a lower portion of the cylinder head cover 3 in the internal combustion engine 1. Then, the exhaust gas from each cylinder is introduced into the exhaust turbine 8 of the exhaust turbocharger 7 through the exhaust pipe 10 and driven to thereby supercharge the intake manifold 6. is there.

A gas-liquid separation box 11 is provided above the cylinder head cover 3, and a PCV valve 13 is provided in a blow-by gas passage 12 from the gas-liquid separation box 11 to the intake manifold 6. This PC
The V-valve 13 is disposed almost directly above the exhaust turbocharger 7. The PCV valve 13 is a valve box 1
A valve body 13b is provided in the valve body 3a, and the valve body 13b is connected to the blow-by gas inlet pipe 13 into the valve box 11a by a spring 13c.
d, while the valve box 11a is provided with a blow-by gas outlet pipe 13e, and the opening of the blow-by gas outlet pipe 13e into the valve box 11a is provided with the valve body 13b. A valve seat 13f is provided to reduce the cross-sectional area of the passage when the valve 13b retreats against the valve 13c. When the intake negative pressure in the intake manifold 6 is close to the atmospheric pressure, the valve 13b by the spring 13c is provided. Pressurizes the blow-by gas inlet pipe 13d, but when the intake negative pressure increases toward the vacuum side, the valve body 13b moves its spring 13c.
When the intake negative pressure further increases, the valve body 13b approaches the valve seat 13f and operates to reduce the passage cross-sectional area.

The PCV valve 13 is mounted by inserting a blow-by gas inlet pipe 13d into a ring-shaped grommet 15 mounted in a mounting hole 14 formed in the gas-liquid separation box 11. In this configuration, the air warmed in the vicinity of the exhaust turbocharger 7 rises by convection, and rises by the convection.
The PCV valve 13 is disposed at a position almost directly above the PCV valve 13. In other words, the PCV valve 13 is heated by the air having a high temperature in the vicinity of the exhaust turbocharger 7. The occurrence of freezing in the PCV valve 13 can be reliably reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a side view taken along the line II-II of FIG.

FIG. 3 is an enlarged sectional view of a PCV valve.

[Description of Signs] 1 Internal combustion engine 2 Cylinder head 3 Cylinder head cover 4 Axis line of cylinder bore 5 Horizontal surface 7 Exhaust turbocharger 11 Gas-liquid separation box 12 Blow-by gas passage 13 PCV valve

Claims (1)

(57) [Scope of request for utility model registration] An internal combustion engine equipped with an exhaust turbocharger is mounted on a vehicle such that an axis of a cylinder bore of the internal combustion engine is inclined with respect to a horizontal plane when viewed from a direction of a crankshaft. A part of the exhaust turbocharger is provided under the cylinder head cover of the internal combustion engine.
The PCV valve provided in the blow-by gas passage from the cylinder head cover to the intake system while being disposed so as to protrude laterally from the top surface of the
The PCV valve is located on the upper surface side of the cylinder head cover and substantially immediately above the exhaust turbocharger.
A blow-by gas processing device for an internal combustion engine for a vehicle, wherein the blow-by gas processing device is disposed so as to protrude laterally from a top surface of a cylinder head cover .