KR101795308B1 - Open Loop Crankcase Ventilation System and Vehicle thereby - Google Patents

Abstract

The open loop type crankcase air conditioning system 1 applied to the vehicle of the present invention is formed in the crankcase space 100-1 in conjunction with the crankshaft 10 of the engine 100 and connected to the outside of the engine 100 In addition to the blow-by gas discharge to the atmosphere, which releases the blow-by gas that has not been re-combusted after the oil is removed by the gas discharge hose 50 to the atmosphere, It is possible to construct a simple system without application of an oil separator.

Description

{Open Loop Crankcase Ventilation System and Vehicle}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crankcase air conditioning system for blow-by gas recirculation, and more particularly, to an open loop crankcase air-conditioning system capable of reducing the amount of blow-by gas generated by removing oil in blowby gas using centrifugal force by rotation of a crankshaft System and vehicle.

Generally, the blow-by gas generated in the internal combustion engine and collected in the crankcase space is a high-temperature high-pressure combustion gas that flows out through the gap between the piston ring and the groove. It contains unburned hydrocarbons, engine oil evaporation, carbon particles and moisture which are the causative substances.

Therefore, a crankcase ventilation system (CVS) for blowby gas recirculation is applied to the engine so as to meet automobile exhaust regulations, and an oil separator is applied to the CVS to thereby remove oil components from blowby gas Remove any moisture that may be present. Hereinafter, the water removed is referred to as oil.

To this end, the oil separator is connected to a blow-by pipe supplied with blow-by gas, a drain pipe for collecting and discharging the separated oil, and a blow-by return pipe for returning the oil-separated blowby gas to the combustion chamber. By using such an oil separator layout, when the blowby gas containing oil and gas in the engine crankcase flows into the oil separator, the oil separator separates the oil and gas from the blowby gas using the internal structure, While the purely blown off oil is sent to the intake duct and burned in the combustion chamber.

Thus, by using the oil separator, the CVS can eliminate the adverse effect that the oil evaporation component has on the engine constituent part, and at the same time, it is possible to satisfy the regulation of the exhaust gas passage 6 by preventing the blow-

Therefore, the CVS is referred to as a closed loop method.

Japanese Patent Application Laid-Open No. 2005-120977 (2005.5.12)

However, the closed loop type CVS is inevitably disadvantageous in terms of cost due to the cost increase due to the increase in the number of parts due to the layout of the pipes for the inflow / return path and the oil drain path of the blowby gas together with the oil separator.

In addition, the closed-loop CVS has a limitation that it can not be used even though it permits air release of the blowby gas to some extent in the regulation of the exhaust gas 6 and the regulation of the exhaust gas amount.

Above all, the closed loop type CVS has a limitation that it can not be free from freezing gas freezing phenomenon caused by temperature drop by making the blow-by gas return pipe an essential component together with the oil separator. For example, in winter, especially in the high latitudes, sub-zero weather may cause the freezing of the remaining blowby gas in the blowby gas return pipe at a stop or parking condition due to engine shutdown, blocking the blowby gas return path, Clogging of the bypass gas path is a cause of damage to the engine cylinder by raising the internal pressure of the engine when the vehicle is running due to re-start of the engine.

Accordingly, the present invention takes into account the above-mentioned problems, and the oil separation in the blowby gas is performed by the centrifugal force due to the rotation of the crankshaft. Thus, the system configuration is simplified by the blowby gas recirculation without application of the oil separator, The blowby gas that has not been re-combusted is discharged to the atmosphere, thereby blocking the cause of the freezing gas freezing in the winter season and at the same time, the blowby gas It is an object of the present invention to provide an open loop crankcase air conditioning system and a vehicle capable of discharging air.

In order to achieve the above object, the open loop type crankcase air conditioning system of the present invention is characterized in that the oil contained in the blow-by gas generated by the combustion of the engine is separated by the centrifugal force due to the rotation of the crank shaft, A blowby gas passage for introducing the by-gas into the inner space of the crankshaft; An oil return passage extending to the blowby gas passage and collecting the oil into return oil by a crankshaft pulley rotated together with the crankshaft; An oil drain passage leading to the oil return passage and collecting the return oil from the rear of the crankshaft pulley and draining the return oil to the oil pan with a drain cover wrapping the crankshaft; And an open loop gas path formed of a gas discharge hose connected to the outside of the engine to discharge the oil-removed blowby gas from the engine to the atmosphere.

In a preferred embodiment, the blow-by gas passage includes a circumferential hole circumferentially drilled in a section where the main journal of the crank shaft and the crank arm are connected, and a shaft pierced in the axial direction of the main journal connected to the crank shaft pulley. And the oil outlet of the shaft hole forms an expanded end of a cone shape.

In a preferred embodiment, the oil return passage includes an oil collecting chamber formed of a closed shaft hole of a pulley coupling boss projecting from the crankshaft pulley and connected to the main rotor of the crankshaft, And an oil chamber communicating hole inclined toward the drain cover communicating with the chamber. The closed structure of the oil collection chamber is formed by a sealing cap fitted in the shaft hole.

In a preferred embodiment, the oil drain passage includes an oil filling chamber formed as a closed inner space of the drain cover, and an oil drain hole opened in the drain cover to communicate with the oil filling chamber.

In order to accomplish the above object, the present invention provides a vehicle comprising: a crank for blowing blow-by gas generated by combustion into a blowby gas passage to separate oil contained in blowby gas by centrifugal force generated by rotation; A shaft, and an oil return passage through which the oil is collected to form a crankshaft pulley connected to the blowby gas passage, and an oil drain passage drained to the oil pan, the oil collected in the oil returning passage being formed at the rear of the crankshaft pulley A drain cover surrounding the crankshaft, and a sealing cap coupled to the crankshaft pulley to block external exposure of the oil collected in the oil return passage. An engine having a cylinder block in which a crankcase space in which the crankshaft constituting the open loop type crankcase air conditioning system is located is formed below the combustion chamber; .

As a preferred embodiment, the engine is provided with an oil pan, which is separated from the blow-by gas containing oil in the open-loop type crankcase air-conditioning system so that the oil to be drained is returned, A cylinder head for collecting the removed blowby gas and discharging the blowby gas to the outside of the engine is provided at an upper portion of the cylinder block and a gas discharge hose communicated with the atmosphere is connected to a blowby gas port provided in the cylinder head.

In the vehicle of the present invention, the crankcase air conditioning system for blow-by gas recirculation is implemented in an open loop manner, thereby realizing the following advantages and effects.

First, centrifugal force due to the rotation of the crankshaft is used for oil separation of the blowby gas, thereby realizing blow-by gas recirculation in a new way in which the oil separator is not applied. Second, since the number of pipes for layout is eliminated by the absence of the oil separator, the construction of the crankcase air conditioning system is extremely simplified. Third, it can secure a cost competitiveness advantage by reducing costs by simplifying the configuration of the crankcase air conditioning system. Fourth, since the blowby gas having oil separation is re-combusted through the crankcase space in which the crankshaft is located, the cause of the frost blow-by gas frost phenomenon occurred during the blow-by gas return path application is fundamentally blocked. Fifth, the prevention of blow-by gas freezing phenomenon prevents the pressure rise inside the engine due to damage inside the engine cylinder. Sixth, only blow-by gas, which is not re-combusted in the engine combustion chamber, goes out of the engine and is discharged into the atmosphere, so that even if the blow-by gas is discharged to the atmosphere, it can meet the regulation of exhaust gas amount and the regulation of exhaust gas amount.

2 is a view showing an example of a vehicle to which an open loop type crankcase air conditioning system according to the present invention is applied, and FIG. 3 is a schematic view of an open loop type crankcase air conditioning system according to an embodiment of the present invention. Open loop crankcase This is the operating status of the air conditioning system.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which illustrate exemplary embodiments of the present invention. The present invention is not limited to these embodiments.

1, an open loop type crankcase air conditioning system 1 includes a crankshaft 10, a crankshaft pulley 20, a drain cover 30, and a sealing cap 40 as open loop components, The gas passage 10A and the oil return passage 20A and the oil drain passage 30A are formed as an open loop oil passage and the gas discharge hose 50 is formed by partially purifying the purified degassed blowby gas, And an open-loop gas path which is discharged to the atmosphere.

Therefore, the open loop constituent part and the open loop oil path are concentrated toward the crankcase space 100-1 of the engine 100, thereby simplifying the system compared to the conventional method using a complexly connected oil separator with a large number of pipes, There is an advantage that the external layout simplification of the image forming apparatus 100 is also realized. In addition, since the open-loop gas path is formed by the gas discharge hose 50, compared with the conventional method in which the blowby gas is returned to the intake duct, the degree of the exhaust gas blow- It is possible to discharge the blow-by gas to the atmosphere.

Specifically, the crankshaft 10, the crankshaft pulley 20, the drain cover 30, and the sealing cap 40, which constitute the open loop constituent part, are as follows.

The crankshaft 10 includes a crank arm 11 for reciprocating motion of the piston and a main journal 13 for fastening the crankshaft pulley 20. Therefore, the crankshaft 10 is identical to a conventional crankshaft applied to an internal combustion engine. However, there is a difference in that the blowby gas passage 10A is formed in the crankshaft 10 by using the crank arm 11 and the main journal 13.

The crankshaft pulley 20 includes a pulley fastening boss 21 fastened to the main journal 13 of the crankshaft 10. The crankshaft pulley 20 is therefore identical to a conventional crankshaft pulley applied to an internal combustion engine. However, the crankshaft pulley 20 has a shaft hole formed in the pulley coupling boss 21, and the oil return passage 20A communicating with the blowby gas passage 10A is formed by using the shaft hole .

The drain cover 30 is located behind the crankshaft pulley 20 and is wound around the connecting portion between the main journal 13 of the crankshaft 10 and the pulley coupling boss 21 of the crankshaft pulley 20 As shown in FIG. To this end, the drain cover 30 includes a crank case supporting bracket (not shown) for supporting the main journal 13 of the crank shaft 10 penetrating the crank case space 100-1 while coupling the crank case to the engine 100 . In particular, the drain cover 30 forms an oil drain passage 30A to collect the oil from the oil return passage 20A of the crankshaft pulley 20 and drain it to the oil pan. Therefore, the drain cover 30 is sealed by packing or the like so that the internal space constituting the oil drain passage 30A is hermetically sealed, and the packing can be provided using the crankcase supporting bracket. However, when the drain cover 30 forms the oil drain passage 30A as an inner chamber that is disconnected from the outside, to which the drain hole through which the oil escapes is connected, the packing may not be applied.

The sealing cap 40 is engaged with a shaft hole formed in the pulley coupling boss 21 of the crankshaft pulley 20 to seal the oil return passage 20A. In particular, the sealing cap 40 can be press-fitted or screwed into the shaft hole. However, the sealing cap 40 may be omitted from the open loop component when the shaft hole is not penetrated through the pulley fastening boss 21 at a predetermined depth.

Specifically, the detailed structure of the blow-by gas passage 10A, the oil return passage 20A, and the oil drain passage 30A forming the open-loop oil passage is as follows.

The blowby gas passage 10A is formed in the crankshaft 10 by a circumferential hole 10-1, a shaft hole 10-2 and an extended end 10-3. For example, the circumferential hole 10-1 is formed in the crank arm 11 of the crankshaft 10. Particularly, the circumferential hole 10-1 is pierced in the circumferential direction with respect to the circular cross section of the main journal 13 by using the connecting portion between the crank arm 11 and the main journal 13. The shaft hole 10-2 is pierced through the axial direction of the main journal 13 of the crankshaft 10 and is connected to the circumferential hole 10-1 so that the shaft hole 10-1 is connected to the circumferential hole 10-1. -2 as the oil inlet and the position opposite to the shaft hole 10-2 not connected to the circumferential hole 10-1 as the oil outlet. Therefore, the circumferential hole 10-1 and the shaft hole 10-2 are formed in the cross-section of the crankshaft 10. Particularly, the shaft hole 10-2 forms an expansion end 10-3 at an oil outlet, and the expansion end 10-3 extends the diameter of the shaft hole 10-2 into a cone shape, -2). ≪ / RTI >

The oil return passage 20A is formed in the pulley fastening boss 21 of the crankshaft pulley 20 by the oil collecting chamber 20-1 and the oil chamber communication hole 20-2. For example, the oil collection chamber 20-1 is formed in a shaft hole which is bored in the pulley fastening boss 21 of the crankshaft pulley 20 and sealed by a sealing cap 40, End 10-3. The oil chamber communication hole 20-2 is opened in the pulley fastening boss 21 so as to communicate with the oil collection chamber 20-1 so that the oil in the oil collection chamber 20-1 flows into the oil drain passage 30A And discharge it. Particularly, the oil chamber communicating hole 20-2 is inclined so that the outlet thereof is positioned toward the drain cover 30, so that the oil is more easily discharged to the drain cover 30 positioned behind the crankshaft pulley 20 .

The oil drain passage 30A is formed in the drain cover 30 by the oil filling chamber 30-1 and the oil drain hole 30-2. For example, the oil filling chamber 30-1 is formed in the inner space of the drain cover 30, which is hermetically sealed to the outside, to collect the oil from the oil chamber communication hole 20-2 of the oil return passage 20A. I will. The oil drain hole 30-2 discharges the oil collected in the oil filling chamber 30-1 and returns to the oil pan. Particularly, the oil drain hole 30-2 is straightly pierced and positioned such that the drain cover 30 is fastened to the main journal 13 of the crankshaft 10 so as to face the ground. The reason for this is that the oil is quickly discharged under the influence of gravity in accordance with the characteristics of the drain cover 30 which is not rotated.

Specifically, the gas discharge hose 50 constituting the open-loop gas path is generated by the combustion of the engine 100 and is collected in the crankcase space 100-1, and a part of the non-re-combusted blow- Bygas is taken out of the engine 100 and discharged to the atmosphere. For this purpose, the gas discharge hose 50 is connected to the outside of the engine 100 so as to be exposed from the engine 100.

2 and 3 show the operating state of the open-loop type crankcase air conditioning system 1 in the vehicle 200. FIG.

Referring to FIG. 2, the vehicle 200 includes an engine 100 to which an open loop type crankcase air conditioning system 1 is applied.

Specifically, the engine 100 includes a cylinder block 101 having a crankcase space in which a crankshaft is rotated by reciprocating movement of a piston due to fuel combustion, An oil pan 103 containing oil is coupled and a cylinder head 105 having a valve system together with a camshaft is coupled to the oil pan 103. Therefore, the engine 100 has the same configuration as that of a conventional internal combustion engine by using the cylinder block 101, the oil pan 103, and the cylinder head 105 as constituent elements. The engine 100 is provided with a blowby gas port 105-1 in the cylinder head 105 (or a cylinder cover coupled to the cylinder head 105), and the blowby gas port 105-1 There is a difference in forming a space in which some of the non-re-combusted blow-by gas is gathered out of the purely de-oiled blow-by gas.

Specifically, the open-loop type crankcase air-conditioning system 1 comprises the same components as the open-loop type crankcase air-conditioning system 1 described in FIG. 1, except that the open- There is a difference that the discharge hose 50 is connected to the blowby gas port 105-1 of the engine 100 and is exposed to the outside from the cylinder head 105. [ Therefore, some of the purely blowby gas that has been refluxed in the engine 100 is blown out of the engine 100 through the cylinder head 105 to the atmosphere.

3, blowby gas (hereinafter referred to as " contaminated blowby gas ") containing oil generated by combustion of the engine 100 is collected in the crankcase space 100-1 of the cylinder block 101. [

Then, the blowby gas passage 10A formed in the crankshaft 10, which rotates rapidly in the crankcase space 100-1, sucks the dirty blowby gas, and then, by the strong centrifugal force generated by the rotation of the crankshaft 10, (Hereinafter referred to as " purified blowby gas ").

Specifically, the action of the blow-by gas passage 10A is as follows. The contaminated blowby gas that enters the circumferential hole 10-1 and fills the circumferential hole 10-1 and the shaft hole 10-2 is subjected to a centrifugal force due to the rotation of the crankshaft 10, It separates the contaminated blowby gas into pure blowby gas from which the blowby gas component oil and oil are removed. This oil separation action is generated in the shaft hole 10-2 so that the shaft hole 10-2 acts as an oil discharge path. Then, the oil is discharged to the oil return passage 20A through the shaft hole 10-2, and the oil return passage 20A collects the discharged oil into the return oil. At this time, the oil exits the shaft hole 10-2 more easily because of the extended end 10-3 formed at the outlet of the shaft hole 10-2.

Specifically, the action of the oil return passage 20A is as follows. The oil collection chamber 20-1 temporarily collects the oil from the shaft hole 10-2 and the oil chamber communication hole 20-2 communicates with the oil collection chamber 20-1 to temporarily collect the oil And discharged from the oil collection chamber 20-1. Then, the oil in the oil return passage 20A is discharged to the oil drain passage 30A.

Specifically, the action of the oil drain passage 30A is as follows. The oil filling chamber 30-1 temporarily collects the oil from the oil chamber communication hole 20-2 and the oil drain hole 30-2 communicates with the oil filling chamber 30-1 to temporarily collect Thereby discharging the oil from the oil drain passage 30A. Then, the oil in the oil drain passage 30A is drained to the oil pan 103.

As a result, the oil is returned to the oil pan 103 after sequentially passing through the blow-by gas passage 10A, the oil return passage 20A, and the oil drain passage 30A. This oil separation and oil pan return process is continued during operation of the engine 100, thereby reducing the amount of oil consumed by re-combustion.

On the other hand, the pure blowby gas from which the oil is removed from the blowby gas passage 10A is discharged from the circumferential hole 10-1 back into the crankcase space 100-1 by the purified blowby gas. In this case, the purified blowby gas may contain an oil component that has not been completely removed, but the amount of the remaining oil component may be significantly reduced compared to the case where centrifugal force is not applied. Particularly, since the centrifugal effect continues during operation of the engine 100 and the water evaporation effect due to the contact of the crankshaft 10 at high temperature is added, the purified blowby gas can be in a state of almost no oil component.

Then, the purified blowby gas is lifted up in the crankcase space 100-1, and a part that is re-combusted or not re-combusted in the combustion chamber is discharged to the atmosphere through the open-loop gas path.

Specifically, the action of the open-loop gas path is as follows. The gas discharge hose 50 is connected to the blowby gas port 105-1 of the cylinder head 105 so as to communicate the inside and the outside of the engine 100 excluding the combustion chamber of the cylinder block 101. [ Therefore, the path connecting the cylinder block 101 to the cylinder head 105 and the blowby gas port 105-1 is a path through which the non-re-combusted portion of the refuel blow-by gas is collected back into the blow- And the gas discharge hose 50 forms a final discharge path for discharging the blowby gas from the blowby gas port 105-1 to the atmosphere. Since the blow-by gas is discharged to the atmosphere without being returned to the intake duct by the gas discharge hose 50, there is no fear of engine breakage due to freezing of the blow-by gas during the winter season. In particular, blow- Bygas can be discharged to the outside, but it can meet the regulation of exhaust gas 6 and exhaust gas total amount regulation.

As described above, the open loop type crankcase air conditioning system 1 applied to the vehicle according to the present embodiment is formed in the crankcase space 100-1 in cooperation with the crankshaft 10 of the engine 100, The blowby gas that has not been re-combusted after the oil is removed by the gas discharge hose 50 connected to the outside of the engine 100 is discharged to the atmosphere, thereby blocking the freeze gas blocking phenomenon in the winter season and regulating exhaust gas flow 6 and satisfying the exhaust gas total amount regulation In addition to blow-by gas discharge to atmosphere, simple system configuration without oil separator is possible.

1: Open loop type crankcase air conditioning system
10: crankshaft 11: crank arm
13: main journal 10A: blow-by gas passage
10-1: Circumferential hole 10-2: Axle hole
10-3: Extended End
20: crankshaft pulley 21: pulley locking boss
20A: Oil return passage 20-1: Oil collection chamber
20-2: Oil chamber communication hole
30: drain cover 30A: oil drain passage
30-1: Oil filling chamber 30-2: Oil drain hole
40: sealing cap 50: gas discharge hose
100: engine 100-1: crankcase space
101: cylinder block 103: oil pan
105: cylinder head 105-1: blowby gas port
200: vehicle 200-1: engine room

Claims (20)

A blowby gas passage for introducing the blowby gas into the inner space of the crankshaft so that the oil contained in the blowby gas generated by the combustion of the fuel is separated by the centrifugal force due to the rotation of the crankshaft;
An oil return passage extending to the blowby gas passage and collecting the oil into return oil by a crankshaft pulley rotated together with the crankshaft;
An oil drain passage connected to the oil return passage and collecting the return oil from the rear of the crankshaft pulley and draining the return oil to the oil pan with a drain cover surrounding the crankshaft;
And an open loop type crankcase air conditioning system.
The open loop type crankcase air conditioning system according to claim 1, wherein the blowby gas passage is formed in the crankshaft.
The open loop type crankcase air conditioning system according to claim 2, wherein the blowby gas passage comprises a circumferential hole drilled in the circumferential direction of the crankshaft and a shaft hole drilled axially. The open loop type crankcase air conditioning system of claim 3, wherein the circumferential hole and the shaft hole are formed using a crank arm to which the main journal of the crank shaft and the main journal are connected.
The open loop type crankcase air conditioning system according to claim 4, wherein the circumferential hole is located at a connecting portion between the main journal and the crank arm, and the shaft hole is located in the main journal.
The open loop type crankcase air conditioning system according to claim 4, wherein the circumferential hole is communicated with a crankcase space in which the crank arm is located, and the shaft hole is communicated with the crankshaft pulley out of the crankcase space.
The open loop type crankcase air conditioning system according to claim 3, wherein the oil outlet of the shaft hole is formed with an expansion end for expanding the diameter of the shaft hole into a cone shape.
The open loop type crankcase air conditioning system according to claim 1, wherein the oil return passage is formed in the crankshaft pulley.
The oil recovery apparatus according to claim 8, wherein the oil return passage includes an oil collection chamber formed as a shaft hole of a pulley coupling boss projecting from the crankshaft pulley and connected to the crankshaft, an oil chamber pierced by the pulley coupling boss and communicating with the oil collection chamber, And a communication hole formed in the crankcase.
The open loop type crankcase air conditioning system according to claim 9, wherein the oil collection chamber is hermetically sealed to the outside, and the oil chamber communication hole is inclined toward the drain cover.
The open loop type crankcase air conditioning system according to claim 10, wherein the sealing structure of the oil collection chamber is formed by a sealing cap fitted to the shaft hole.

The open loop type crankcase air conditioning system according to claim 1, wherein the oil drain passage is formed in the drain cover.
The open-loop type crankcase according to claim 12, wherein the oil drain passage comprises an oil filling chamber formed as a closed inner space of the drain cover, and an oil drain hole communicated with the oil filling chamber by being pierced by the drain cover Air conditioning system.
The open loop type crankcase air conditioning system according to claim 13, wherein the oil drain hole is positioned so as to face the ground in a state where the drain cover is fastened to the crankshaft.
The open loop type crankcase air conditioning system according to claim 1, wherein the blowby gas from which the oil is removed is discharged into the atmosphere through an open loop gas path.

16. The open loop type crankcase air conditioning system of claim 15, wherein the open loop gas path is formed of a gas discharge hose communicated with the atmosphere.
An open loop type crankcase air conditioning system according to any one of claims 1 to 16;
An engine having a cylinder block in which a crankcase space in which the crankshaft constituting the open loop type crankcase air conditioning system is located is formed below the combustion chamber;
And a vehicle.
[17] The engine according to claim 17, wherein the engine is provided with a lower portion of the cylinder block in which an oil to be separated from the blowby gas containing oil is returned, in the open loop type crankcase air conditioning system, And a cylinder head for collecting the removed blowby gas and discharging the blowby gas to the outside of the engine is provided as an upper portion of the cylinder block.
19. The vehicle of claim 18, wherein the cylinder head is connected to a gas discharge hose communicated with the atmosphere.
21. The vehicle of claim 19, wherein the gas discharge hose is connected to the blowby gas port of the cylinder head.

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