KR20080019437A - Blow-by gas passage structure in engine for vehicle - Google Patents

Abstract

A blow-by gas passage structure in an engine for preventing freeze of a PVC valve is provided to prevent a pipe from being clogged due to moisture condensation and freeze by feeding blowby-gas to a suction part through a blow-by gas passage in the engine. In a blow-by gas passage structure in an engine for preventing freeze of a PVC valve, a pipe(121) is installed in a head cover(120) to guide blowby-gas. A hole(111) is formed in an engine so that the blowby-gas sent from the pipe moves to a suction manifold(130) in the head cover. A PVC valve(140) is installed in the passage in the engine.

Description

Blow-by gas passage structure in engine for vehicle

1A and 1B are a plan perspective view and a bottom perspective view respectively showing a head cover structure of an engine;

2 shows an upper part of an engine equipped with a PCV hose;

3 is a view showing a blowby gas passage according to the prior art,

4 is a cross-sectional view showing a blow-by gas passage structure according to the present invention.

<Explanation of symbols for the main parts of the drawings>

110: cylinder head 111: hole

112: O-ring 120: head cover

121 pipe 130 intake manifold

131: Resonator Chamber 132: Surge Tank

133: runner 134: injector

135: hole 140: PCV valve

The present invention relates to a blow-by gas passage structure for improving the problem of PCV valve icing, and more particularly, in the automobile engine by processing a hole for forming a gas path inside the cylinder head and the intake manifold from the head cover It relates to a blow-by-gas passage structure formed by forming a passage connected to the resonator chamber of, and mounting a PCV valve inside the passage formed by the hole processing method as described above.

In general, when the exhaust gas of the vehicle is classified according to the discharge source, the exhaust gas discharged through the exhaust system after the mixture of fuel and air is combusted in the cylinder, the evaporation gas generated by the fuel in the fuel tank evaporates, and the combustion chamber Mixer or unburned gas can be divided into blow-by gas flowing into the crankcase.

Here, blow-by gas refers to gas which escapes from the combustion chamber to the crankcase through the gap between the cylinder and the piston during the compression stroke and the expansion stroke, and discharges the cylinder block and the cylinder head after exiting the crankcase from the combustion chamber. Pass through the passage and head cover.

On the other hand, since the blow-by gas increases the internal pressure of the engine and adversely affects the engine sealing, to control the pressure, the blow-by gas must be discharged to the outside of the engine to prevent the increase of the pressure inside the engine. This is the ventilation system.

In this ventilation system, as shown in FIGS. 1A and 1B, a PCV hose 16 is connected between the head cover 10 and the intake manifold, and the head cover 10 and the air intake hose are air intake. A breather hose 17 is connected between the hoses so that blow-by gas generated inside the engine is discharged to the outside of the engine.

Here, the blow-by gas always moves from the head cover 10 side to the intake manifold side with the PCV hose 16, and the breather gas 17 moves from the air inlet hose side to the head cover 10 side in the low speed region. However, in the high speed region, the blow-by gas moves from the head cover 10 side to the air suction hose side.

At this time, in the chamber 13 formed by the baffle plate 11 inside the head cover 10, the oil mixed in the blow-by gas is separated, and the oil is returned to the inside of the engine, and the gas is supplied to the PCV nipple 14 And through the breather nipple 15 to the outside of the engine.

The chamber 13 is blocked by the baffle plate 11, and the blow-by gas inlet 12 is provided at one side of the baffle plate 11, and the blow through the discharge passage of the cylinder block and the cylinder head is provided. By-gas is introduced into the chamber 13 through the blow-by gas inlet 12 and then discharged.

The baffle plate 11 inside the head cover 10 filters the oil from the blow-by gas introduced into the head cover, and serves to minimize oil consumption by filtering and returning the oil from the blow-by gas as much as possible. In this case, only the remaining blow-by gas filtered with oil is sent to the intake side.

On the other hand, the blowby gas passage structure according to the prior art for re-introducing the blow-by gas in the combustion chamber in the head cover as follows.

As shown in FIG. 2 and FIG. 3, the head cover 10 and the surge tank 22 are connected to the positive crankcase ventilation (PCV) hose 31 to connect the head cover (C) through the discharge passage of the cylinder block and the cylinder head. The blow-by gas introduced into the inner space of 10) flows from the head cover to the surge tank 22 through the PCV hose 31, and then is returned from the surge tank 22 to the combustion chamber of the engine through the intake manifold. Supply and reburn.

At this time, the inlet portion of the PCV hose 31 is provided with a PCV valve 32, the PCV valve 32 is operated by the negative pressure in the surge tank 22 to adjust the flow rate of blow-by gas.

The PCV valve is a one-way valve that flows into the intake side by using the negative pressure of the intake manifold for the purpose of preventing the release of blow-by gas generated inside the engine and scavenging it during the combustion process.

In FIG. 3, reference numeral 23 denotes a runner of the intake manifold 20, 24 denotes an injector, and 21 denotes a resonator chamber.

On the other hand, the conventional blow-by gas passage in which the PCV hose 31 is provided between the head cover 10 and the surge tank 22 and the PCV valve 32 is installed at the inlet of the PCV hose 31 as described above. According to the structure, there are the following problems.

Conventionally, the PCV paths such as the PCV hose 31 and the passages in the PCV valve 32 are directly exposed to the outside air. Therefore, they are contained in the blow-by gas under the condition that the atmospheric temperature is below zero, such as in the cold or the winter season. In the process of inflow of moisture to the intake side, freezing of condensed water may occur in passages in the PCV valve.

When such icing occurs, normal operation is impossible such as the PCV valve is not blocked due to clogging, and the blow-by gas is not discharged to the surge tank from the inside of the engine.

This causes the blow-by gas to increase the pressure inside the engine adversely affects the engine sealing (sealing), and eventually accompanied by a leak (sealing) of the sealing joint.

Therefore, the present invention is invented to solve the above problems, and the blow-by gas is introduced into the intake side through the passage inside the engine so that it is not affected by the outside air temperature, the freezing phenomenon in the pipeline of the PCV valve is fundamental. The purpose is to provide a blow-by gas passage structure that is prevented by.

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

The present invention relates to a blow-by-gas passage structure of an automobile engine comprising a passage connected from a head cover to a surge tank of an intake manifold in a vehicle engine and a PCV valve provided on the passage.

Pipes are installed to allow the blow-by gas to flow into the head cover, and hole processing is performed inside the engine so that the blow-by gas introduced through the pipe is not exposed to the outside air so as to expose the passage through which the blow-by gas flows from the head cover to the intake manifold. It provides a blow-by-gas passage structure for preventing the PCV valve icing, characterized in that formed by mounting a PCV valve in the passage in the engine formed by hole processing.

In particular, the pipe outlet end is located on the joining surface of the head cover to the cylinder head, and a hole connected to the pipe outlet end is formed in the cylinder head to the junction with the intake manifold. A blow is formed through a hole connecting the hole inside the cylinder head and the resonator chamber, and a PCV valve is mounted inside the hole toward the junction with the cylinder head in the intake manifold, and passes through the pipe, the hole and the PCV valve. It is characterized in that the bigas is introduced into the combustion chamber through the resonator chamber and the surge tank.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow-by gas passage structure for improving the problem of PCV valve icing. In an automobile engine, a resonator chamber of an intake manifold from a head cover is formed by processing a hole for forming a gas path inside a cylinder head and an intake manifold. It relates to a blow-by-gas passage structure formed by forming a passage connected to, and mounting a PCV valve inside the passage formed by the hole processing method as described above.

4 is a cross-sectional view showing a preferred embodiment of the blow-by gas passage structure according to the present invention, with reference to this will be described in more detail with respect to the blow-by gas passage structure according to the present invention.

In the engine structure shown in FIG. 1, reference numeral 110 denotes a cylinder head, 120 denotes a head cover, 134 denotes an injector, 130 denotes an intake manifold, and an intake manifold 130 Reference numeral 131 denotes a resonator chamber, reference numeral 132 denotes a surge tank, and reference numeral 133 denotes a runner.

In general, when the air enters through the surge tank 132 in the automobile engine, the air flows through the runners 133 of the intake manifold 130 and flows, and the air distributed through the runners 133 is injector 134. After mixing with the fuel injected by the injection into the combustion chamber is to be burned.

In addition, the blow-by gas passing through the discharge passage of the cylinder block and the cylinder head in the crank case is introduced into the head cover 120, and then the blow-by filter oil is filtered by the baffle plate (not shown) in the head cover 120. The gas moves to the surge tank 132 of the intake manifold 130, merges with the newly introduced air, and is reintroduced into the combustion chamber to be reburned.

In the present invention, in order to improve the freezing problem of the PCV valve, instead of deleting the PCV hose and the PCV valve exposed to the outside air as in the prior art, blow-by gas to the intake manifold 130 in the head cover 120 for reburning A passage that can move to the inside of the engine is formed inside the engine so as not to be exposed to the outside air, and the PCV valve 140 is mounted in the passage formed inside the engine, and blows from the head cover 120 to the intake manifold 130. It constitutes a passage structure through which bigas can move.

The passage structure includes a PCV valve 140 through which blow-by gas passes, and the PCV valve 140 may be mounted inside the engine to solve a problem of freezing of the PCV valve.

In more detail, first, a pipe 121 integral with a baffle plate (not shown) is installed inside the head cover 120, and an outlet end of the pipe 121 is connected to a cylinder head (eg, the head cover 120). 110) to the side to be joined to.

The inlet end is positioned on the cylinder head surface (head cover relative assembly surface) to be joined to the head cover 120 to form a hole 111 penetrating through the cylinder head 110. The outlet end of 111 is positioned on the cylinder head surface (intake manifold relative assembly surface) to be joined to the intake manifold 130.

The inlet end position of the hole 111 is a position that can be matched with the outlet end of the pipe 121 when the head cover 120 and the cylinder head 110 is assembled, that is, a position that can be connected to the outlet end of the pipe 121 When the head cover 120 is assembled to the cylinder head 110, the outlet end of the pipe 121 is connected to the inlet end of the hole 111 in the cylinder head, thereby providing the pipe 121 and the cylinder head. The inner hole 111 serves as a passage to form a gas path.

At this time, the O-ring 112 is installed at the junction of the outlet end of the pipe 121 and the hole 111 in the cylinder head to seal it.

The intake manifold 130 is formed by processing the hole 135 penetrating the intake manifold 130 so that the inlet end is positioned on the surface (cylinder head relative assembly surface) to be joined to the cylinder head 110. The outlet end of the hole 135 is positioned toward the resonator chamber 131 so that the hole 135 of the intake manifold 130 is connected to the resonator chamber 131.

As a result, the pipe 121 in the head cover 120, the hole 111 penetrating the inside of the cylinder head 110, and the hole 135 connected to the resonator chamber 131 inside the intake manifold 130 are provided. It becomes a passage and forms a gas path.

On the other hand, the PCV valve 140 is mounted inside the junction 135 with the cylinder head 110, that is, inside the hole 135 on the flange side of the intake manifold 130.

By mounting the PCV valve 140 in the hole 135 of the intake manifold 130 as described above, the blow-by gas passing through the pipe 121 of the head cover 120 and the hole 111 of the cylinder head 110 is generated. The blow-by gas passing through the hole 135 of the intake manifold 130 passes through the PCV valve 140 and eventually passes through the hole 135 of the intake manifold 130. After passing through the surge tank 132 through the runner 133 as in the prior art is re-introduced into the combustion chamber.

Of course, the PCV valve 140 is operated by the negative pressure of the surge tank 132 and the resonator chamber 131, and adjusts the flow rate of the blow-by gas.

In this way, in the present invention, a hole for forming a gas path is formed in the cylinder head and the intake manifold to form a passage connecting the head cover to the resonator chamber of the intake manifold, and is formed by the hole processing method as described above. A PCV valve is installed inside one passage to form a blow-by gas passage structure.

As described above, according to the blow-by-gas passage structure for preventing the PCV valve freezing according to the present invention, the resonator of the intake manifold from the head cover by processing a hole for forming a gas path in the cylinder head and the intake manifold By forming a passage connected to the chamber, and by mounting a PCV valve inside the passage formed by the hole processing method as described above to form a blow-by-gas passage structure, the following effects can be obtained.

1) Since blow-by gas flows into the intake side through the blow-by gas passage inside the engine, which is blocked from the outside, it is possible to fundamentally solve the blockage of the pipe due to moisture condensation and freezing without being affected by outside temperature.

2) In particular, since the PCV path is blocked from the outside and adjacent to the combustion chamber on the cylinder head side, it is possible to prevent freezing due to oil sludge and condensate in the pipeline even in cold areas.

3) In addition, the PCV hoses, etc., which were removed from the outside of the engine are deleted, so that the space occupied by them can be utilized, and since there are no exposed parts, they can be seen in appearance, and the effect of assembly labor and parts can be reduced.

4) In addition, it is not necessary to consider the increase in the flow rate of the PCV valve to prevent freezing, and thus there is an advantage of minimizing oil consumption.

Claims (2)

In a blow engine gas passage structure of an automotive engine comprising a passage connected from a head cover to a surge tank of an intake manifold in a vehicle engine and a PCV valve installed on the passage, Pipes are installed to allow the blow-by gas to flow into the head cover, and hole processing is performed inside the engine so that the blow-by gas introduced through the pipe is not exposed to the outside air so as to expose the passage through which the blow-by gas flows from the head cover to the intake manifold. And a PCV valve mounted in the passage inside the engine formed by hole processing. The method according to claim 1, The pipe outlet end is positioned on the joining surface of the head cover to the cylinder head, and a hole connected to the pipe outlet end is formed to penetrate into the joining part with the intake manifold in the cylinder head, and the cylinder inside the intake manifold. Blow-by-gas which passes through the pipe, the hole and the PCV valve by forming a through-hole connecting the hole inside the head and the resonator chamber, and installing the PCV valve inside the hole toward the junction with the cylinder head in the intake manifold. The blow-by gas passage structure for preventing the icing of the PCV valve, characterized in that the flow through the resonator chamber and the surge tank to the combustion chamber.

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