KR20020046519A - Crankcase emission control system - Google Patents

Abstract

PURPOSE: A crankcase discharge gas controlling device is provided to prevent leakage of oil or gas in a process to recirculate blowby gas to an intake branch pipes, thereby recirculating blowby gas completely. CONSTITUTION: A cylinder head(10) has a plurality of intake passages and circulating passages(14, 16, 18) to inlet or outlet a blowby gas to the intake passages. Intake branch pipes are connected with the intake passages of the cylinder head. A head cover is connected with an upper part of the cylinder head. A PCV valve(40) has an inlet port positioned inside of the head cover to introduce blowby gas, and an outlet port connected with the circulating passages of the cylinder head.

Description

Crankcase emission gas control device {CRANKCASE EMISSION CONTROL SYSTEM}

The present invention relates to a crankcase exhaust gas regulating device, and more particularly, to a crankcase exhaust gas regulating device capable of completely recirculating blow-by gas by integrally mounting a PCV valve inside the engine.

Generally, the exhaust gas control device of a vehicle is composed of three main systems: a crankcase exhaust gas control device, an evaporative gas control device, and an exhaust gas control device. Here, the evaporation gas control device is a device that does not discharge the fuel evaporated gas generated in the vaporizer to the atmosphere, the exhaust gas control device is a device for reducing the nitrogen oxide (NO _x ) contained in the exhaust gas.

The crankcase exhaust gas regulating device is a device for recycling the blowby gas generated inside the crankcase to the intake machine so as not to be released into the atmosphere. The blow-by gas is a gas that escapes into the crankcase through a gap between the piston and the cylinder, and most of the blow-by gas is an unburned gas made of hydrocarbon (HC).

1 is a cross-sectional view showing a crankcase exhaust gas control device according to a conventional embodiment.

1, an intake manifold 2 is connected to an intake passage 1a of the cylinder head 1, and a camshaft, rocker arm, and valve in which the head cover 3 is not shown at the upper end of the cylinder head 1. In accordance with the operation of the lamp, the oil is combined so as not to protrude to the outside. A positive crankcase ventilation valve (PCV) 4 is installed in a horizontal direction at one side of the upper surface of the head cover 3, that is, the upper side of the separator 3a, and the PCV valve 4 is an intake manifold 2. Are connected to each other by a vent pipe 5 such as a pipe or a hose so as to be in communication with each other.

In the conventional crankcase exhaust gas regulating device configured as described above, the blow-by gas generated inside the crankcase (not shown) is passed through the PCV valve 4 by the negative pressure of the intake manifold 2 to vent pipe 5. After being introduced back into the intake manifold (2) through a cycle of recombustion in the combustion chamber.

However, since the inlet portion 4a of the PCV valve 4 is inserted into the head cover 3 and the outlet portion 4b is horizontally installed so as to protrude to the outside, that is, to the outside, the blow-by gas In the process of recirculating the intake manifold (2), there is a problem that gas or oil leaks due to a defect in the fastening portion of the vent pipe 5, which is an intermediate medium.

In addition, considering the importance of durability in relation to the life of the vehicle, the durability of the pipe or hose, such as the vent pipe (5) that is assembled to the outside of the engine also affects the quality of the vehicle.

Therefore, the present invention was created to solve the above-mentioned problems, and an object of the present invention is to discharge the crankcase so that gas or oil can be completely recycled without leakage in the process of recycling the blow-by gas to the intake manifold. It is to provide a gas regulating device.

1 is a cross-sectional view showing a crankcase exhaust gas control device according to a conventional embodiment.

Figure 2 is a cross-sectional view showing a crankcase exhaust gas control device according to an embodiment of the present invention.

3 is a cross-sectional view taken along the line A-A of FIG.

※ Explanation of codes for main parts of drawing

10 cylinder head 12 intake passage

14, 16, 18: vent passage 14: entrance passage

16: distribution room 18: exit passage

20: intake manifold 30: head cover

40: PCV valve 42: inlet

44: outlet

The crankcase exhaust gas control device according to the present invention for achieving the above object, the cylinder head is formed with a plurality of intake passages, and the ventilation passages for flowing in and out the blow-by gas toward the intake passage; An intake manifold connected to the intake passage of the cylinder head; A head cover coupled to an upper end of the cylinder head; And a PCV valve having an inlet portion through which blow-by gas may be introduced into the head cover, and an outlet portion integrally coupled to a vent passage of the cylinder head.

The ventilation passage of the cylinder head is preferably divided into a plurality of outlet passages communicating with each intake passage through a distribution chamber from one inlet passage directly connected to the outlet of the PCV valve.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

2 is a cross-sectional view showing a crankcase exhaust gas control device according to an embodiment of the present invention, Figure 3 is a cross-sectional view taken along line AA of FIG.

In the figure, reference numeral 10 denotes a cylinder head coupled to an upper portion of an unillustrated cylinder and a crankcase, which includes a plurality of intake passages 12 (number corresponding to the number of cylinders) connected to the intake manifold 20; In addition, ventilating passages 14, 16 and 18 are formed to flow in and out of blowby gas generated from a crankcase (not shown) toward the intake passage 12.

Here, the ventilation passages 14, 16 and 18 of the cylinder head are one inlet passage formed directly in connection with the outlet 44 of the PCV valve 40 described later in the vertical direction, as shown in FIG. 14, one distribution chamber 16 horizontally connected from the lower end of the inlet passage 14, and a plurality of outlet passages connected to communicate with each intake passage 12 from the distribution chamber 16; It is divided into (18).

The top of the cylinder head 10 is coupled to the head cover 30 that can be covered so that oil or the like does not protrude to the outside in accordance with the operation of the camshaft, rocker arm, valve, etc., not shown. The separator 32 is formed horizontally on the inner upper side of the head cover 30.

Reference numeral 40 denotes a positive crankcase ventilation valve (PCV) valve, which is opened and closed to flow in and out blow-by gas according to the degree of vacuum of the intake manifold 20. That is, the inlet portion 42 of the PCV valve 40 is vertically installed to face the inside of the head cover 30, while the outlet portion 44 is the inlet side vent passage of the cylinder head 10. (14) is integrally coupled. Such PCV valve 40 preferably takes the form of a coupling that is pinned and pushed in, for example. Of course, the ventilation passage 14 of the cylinder head 10 should be machined with a press-fitting tolerance. In addition, the inlet portion 42 of the PCV valve 40 must be assembled upward through the separator 32 of the head cover 30, but between the separator 32 and the PCV valve 40. There is no need for confidentiality.

In the crankcase exhaust gas regulating device of the present embodiment provided as described above, the blow-by gas generated inside the crankcase (not shown) by the vacuum pressure of the intake manifold 20 passes through the PCV valve 40 located inside the engine. It is introduced into the vent passages 14, 16 and 18 of the cylinder head 10. That is, the blow-by gas flowing into the inlet passage 14 is equally distributed to the plurality of outlet passages 18 through the distribution chamber 16 and then discharged to each intake passage 12, and then the intake manifold 20 After being introduced back into the tank, it is recirculated in a cylinder combustion chamber (not shown).

According to the present embodiment, since the PCV valve 40 is embedded in the engine and does not require a separate connector for communicating with the intake manifold 20, there is no fear of gas or oil leakage. The gas can be recycled almost 100% to complete combustion. In addition, it is not necessary to consider the durability aspects such as cracking or torn separate connectors as in the prior art. In order to seal between the valve 40 and the head cover 30 as in the related art, the constraint of considering the material or the fastening form of the valve 40 is not limited. In addition, since the inlet portion 42 of the valve 40 is assembled upward in the head cover 30, it is possible to prevent the incorporation of oil to some extent as compared with the conventional valve assembled horizontally. In addition, as the number of parts required for assembly is greatly reduced, not only the assembly performance can be improved but also the cost reduction can be achieved.

Claims (2)

A cylinder head having a plurality of intake passages and a vent passage through which blow-by gas can flow in and out of the intake passage; An intake manifold connected to the intake passage of the cylinder head; A head cover coupled to an upper end of the cylinder head; And And an inlet portion through which blow-by gas may be introduced into the head cover, and a PCV valve having an outlet portion integrally coupled to a ventilation passage of the cylinder head. The method of claim 1, And a vent passage of the cylinder head is divided into a plurality of outlet passages through a distribution chamber from one inlet passage directly connected to the outlet of the PCV valve.