JPH0113780Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an oil separator that separates lubricating oil from blow-by gas generated in an internal combustion engine.

(Prior Art) Various devices for separating lubricating oil from blow-by gas have been proposed in the past. For example, as shown in Japanese Utility Model Application Publication No. 56-149013, a gas-liquid separation case is provided in the cylinder head cover, and a baffle plate protrudes into the case to form a zigzag passage, and blow-by gas containing oil flows through this zigzag passage. The oil component contained in the gas is removed by rapidly changing the flow direction of the gas as it flows through the passage.

In other words, the gas part can smoothly change the direction of the flow, but the oil particle part with a certain mass or more is difficult to change direction rapidly, so it collides with the wall of the zigzag passage and sticks, and the number of oil particles that stick increases. Then, it becomes oil droplets or drops and falls under its own weight. The blow-by gas from which the oil component has been removed in this way is sucked into the intake manifold.

However, since the mist-like oil particles having a relatively small mass float through the zigzag passage together with the blow-by gas, it has been difficult to completely separate and collect the oil component in the blow-by gas. As a result, the lubricating oil flows into the intake manifold without being sufficiently separated, resulting in an increase in lubricating oil consumption and the disadvantage that various sensors attached to the manifold are contaminated by the oil.

(Problems to be Solved by the Invention) The present invention attempts to solve the conventional problems such as the contamination of various sensors with oil by completely removing the oil component from the blow-by gas.

(Means for Solving the Problems) Therefore, the present invention provides a case that performs gas-liquid separation of blow-by gas integrally with a cylinder head cover that covers the upper surface chamber of the cylinder head of an internal combustion engine, and also provides a case that performs gas-liquid separation of blow-by gas. A zigzag passage having one or more labyrinths formed by an integral wall and a bottom plate and leading to the blow-by gas inlet is provided, and a porous filter made of foamed metal is disposed at a position higher than the bottom plate of the passage, and the filter An expansion chamber is provided downstream of the expansion chamber, an oil reservoir is provided below the upstream side of the bottom of the expansion chamber, and the bottom is gradually inclined upward as it reaches the downstream direction, thereby increasing the vertical height of the expansion chamber. This structure is designed to gradually reduce the size, and this is used as a means to solve the problem.

(Function) Now, the lubricating oil droplets that are scattered from the inlet together with the blow-by gas collide with the wall of the zigzag passage, and the large droplets of oil are separated into gas and liquid, and then the vapor-like and mist-like oil is separated by a filter. be done.

(Example) An example of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show an example of the present invention,
1 is an internal combustion engine, and the upper chamber 2 of the cylinder head
A cylinder head cover 3 covering the cylinder head is fixed on the cylinder head via packing 4.

Reference numeral 5 denotes an oil separator, which is integrally formed with the cylinder head cover 3 and has a case 6 with an open bottom surface for separating blow-by gas into gas and liquid. A baffle plate 7 is fixed to the lower opening of the case 6, and a gas-liquid separation chamber 8 is formed therein. 9 is a wall 10 integrated with the cylinder head cover 3
At the entrance of the zigzag passage formed by the buff-full plate 7, the blow-by gas flows into the gas-liquid separation chamber 8 from the entrance 9 as indicated by the arrow 1. In addition, a blow-by gas outlet port 11 is provided on the side wall of the case 6.
The port 11 communicates with the intake manifold via a passage means such as a rubber hose (not shown).

12 is the double plate 7 of the zigzag passage.
A porous filter made of foamed metal is disposed at an angle of 15 to 90 degrees at a higher position than the bottom plate formed by the filter, and its outer periphery is locked to the buff-full plate 7 and the wall 10. Reference numeral 13 denotes an expansion chamber provided downstream of the filter 12, which is formed by the baffle plate 7, the wall 10, and the filter 12, and the bottom of the expansion chamber 13 gradually faces upward as it reaches the outlet port 11 in the downstream direction. is inclined to. Reference numeral 14 denotes an oil reservoir, which communicates with the inside of the crankcase of the cylinder head 1 via an umbrella-type check valve 15.

Next, the operation of the embodiment configured as described above will be explained. The lubricating oil droplets that are scattered together with the blow-by gas from the inlet 9 collide with the wall 10 that forms the zigzag passage, whereby large droplets of oil are separated. . After that, the vaporized oil is separated by a porous filter 12 made of foamed metal, but at that time, the fine oil that has passed through the filter 12 is
The oil enters the expansion chamber 13, loses speed, falls, and accumulates in the oil reservoir 14.

(Effects of the invention) As explained in detail above, the invention has one or more labyrinths formed by the wall and bottom plate integrated with the cylinder head, and has a zigzag passage leading to the blow-by gas inlet. Large droplets of oil are separated by collision of lubricating oil droplets with the constituent walls. Therefore, gummy oil or oil containing dust, chips, etc. will not reach the filter, so there is no risk of filter clogging.
Performance can be maintained. Therefore, the porosity of the filter can be increased, and the efficiency of vapor-liquid separation of vaporized oil can be improved.

Further, in the present invention, since an expansion chamber is provided downstream of the filter, the oil component that has flowed into the expansion chamber loses its speed, falls down, and accumulates in the oil reservoir. Further, since the porous filter is arranged at a higher position than the bottom plate of the zigzag passage, large droplets of oil, etc. that have fallen onto the bottom plate of the zigzag passage will not reach the porous filter above. In addition, the bottom of the expansion chamber is gradually inclined upward as it reaches the downstream direction, so that the vertical height of the expansion chamber gradually decreases, so that the oil flowing through the porous filter has a flow velocity. Changes are more likely to occur, which makes it easier to separate the oil. Furthermore, since the wall forming the zigzag passage is formed integrally with the cylinder head cover, it has many advantages such as the structure being extremely simple compared to a case where it is formed separately.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of the upper half of an oil separator showing an embodiment of the present invention, and FIG. 2 is a view taken along arrow A in FIG. Explanation of the main parts of the diagram, 3... Cylinder head cover, 5... Oil separator, 6... Case,
8... Gas-liquid separation chamber, 9... Inlet, 10... Wall, 1
1... Outlet port, 12... Porous filter, 1
3...Expansion room.

Claims (1)

[Scope of utility model registration request] A case for separating blow-by gas into gas and liquid is provided integrally with a cylinder head cover that covers the upper chamber of the cylinder head of an internal combustion engine, and has one or more labyrinths formed by a wall and a bottom plate integral with the cylinder head cover, and A zigzag passage leading to the blow-by gas inlet is provided, a porous filter made of foamed metal is provided at a position higher than the bottom plate of the passage, an expansion chamber is provided downstream of the filter, and a zigzag passage is provided below the upstream portion of the bottom of the expansion chamber. 1. An oil separator characterized in that an oil reservoir is provided in one side of the expansion chamber, and the bottom part is gradually inclined upward as it reaches the downstream direction, so that the vertical height of the expansion chamber gradually decreases.