JPH0115852Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] [Field of industrial application] The present invention relates to an oil separator installed in an internal combustion engine, and more specifically, to separate lubricating oil from blow-by gas generated in the engine. The invention relates to an oil separator.

Blowby gas refers to gas that blows into the crankcase from the gap between the piston and cylinder during the compression and explosion processes of an engine, and is used in internal combustion engines such as automobile engines where such gas is generated. be done.

(Prior Art) Various devices for separating lubricating oil from blow-by gas have been proposed in the past. For example, in the technology disclosed 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, which contains oil. When the blow-by gas flows through this zigzag passage, the oil component contained in the gas is removed by rapidly changing the flow direction. In other words, the gas part can change the flow direction smoothly,
Since it is difficult for oil particles with a certain mass or more to change direction rapidly, they collide with and adhere to the wall of the zigzag passage, and as the number of adhered oil particles increases, they fall under their own weight as oil pressure or hot water droplets. The blow-by gas from which the oil component has been removed in this way is sucked into the intake manifold.

(Problem to be solved by the invention) However, since the mist-like oil particles, which have a relatively small mass, float through the zigzag passage together with the blow-by gas, it is difficult to completely separate and collect the oil component in the blow-by gas. It was difficult. As a result, the lubricating oil flows into the intake manifold without being sufficiently separated, resulting in a problem in that the amount of lubricating oil consumed increases and various sensors attached to the manifold are contaminated by the oil.

In view of the problems of the prior art described above, the technical object of the present invention is to improve the performance of removing oil components contained in blow-by gas.

[Structure of the idea]

[Means for Solving the Problems] The technical means taken to solve the above technical problems is to install a blow-by blower in the cylinder head cover that covers the upper space of the cylinder head where the valve mechanism of the internal combustion engine is disposed. A baffle member is fixed to the bottom open part for separating gas into liquid and gas, and a gas-liquid separation chamber is formed inside the case, and a coarse foamed metal porous filter is installed on the blow-by gas inflow side of the gas-liquid separation chamber. Fine-mesh foam metal porous filters are arranged vertically in series along the flow of the blow-by gas on the outflow side of the blow-by gas, and the oil A reservoir is formed, and the oil reservoir is communicated with the upper space of the cylinder head through an umbrella-shaped check valve attached to the bottom of the oil reservoir, and the oil reservoir is connected to the downstream side of the porous filter in the gas separation chamber. The space and the space above the cylinder head are isolated by a seal member, and a blow-by gas outlet port is provided above the space on the downstream side of the porous filter.

(Operation) The above technical means operates as follows. In other words, when blow-by gas containing oil particles flows into a gas-liquid separation case provided on the cylinder head cover, the blow-by gas collides with the baffle member and the flow velocity is changed, and the oil particles with larger mass are separated first. Ru. The blow-by gas containing oil particles that remained unseparated by the baffle member flows into the gas-liquid separation chamber, and first collides with the coarse-mesh porous filter, where its flow velocity is significantly reduced, and the relatively mass contained Large oil particles form into oil droplets that adhere to the filter and are separated. Furthermore, the blow-by gas containing fine oil particles that remain unseparated collides with a fine-mesh porous filter, and oil particles with small mass adhere to the filter and are separated, resulting in blow-by gas from which oil components have been removed. Gas flows out to the exit port. The oil components absorbed by both porous filters gather at the bottom of the filters due to their own weight, travel through the seal member, and are temporarily collected in an oil reservoir located at a low position. When the oil in the oil reservoir exceeds a certain level,
Due to its own weight, the check valve opens and the fluid flows back into the clutch case.

In this way, the blow-by gas whose oil component has been separated by the baffle member and both porous filters flows out to the intake manifold side through the outlet port located above the gas-liquid separation chamber.

An embodiment embodying the above technical means will be described below with reference to the accompanying drawings.

In an internal combustion engine 10 shown in the drawings, a cylinder head cover 13 that covers an upper space 12 of a cylinder head 11 is fixed onto the cylinder head 11 via a sealing rubber packing 14. In the space 12 above the cylinder head 11, a valve mechanism 18 is disposed, which includes a camshaft 16, a swing arm 17, etc. for the intake valve and exhaust valve 15.

Now, the oil separator 20 according to the present invention is
The cylinder head cover 13 has an open bottom case 21 which is integrally formed with the cylinder head cover 13 and performs gas-liquid separation of blow-by gas. Lower opening 21 of the case 21
A baffle member 22 is fixed to a, and a gas-liquid separation chamber 23 is formed inside the baffle member 22. When the blow-by gas inside the cylinder head cover 13 flows into the gas-liquid separation chamber 23 as shown by the arrow l in the figure, the oil components scattered in the form of oil beads inside the cylinder head cover 13 are temporarily removed by the buff-full member 22. Be cut off. A blow-by gas outlet port 24 is provided in the upper part of the right side wall 21b of the case 21 in the drawing.
The outlet port 24 communicates with an intake manifold (not shown) through a passageway such as a rubber hose (not shown).

Now, inside the gas-liquid separation chamber 23 in the case 21,
Two foam metal porous filters are vertically arranged in series along the flow of blow-by gas. That is, the coarse porous filter 25 is disposed on the blow-by gas inlet side, and the fine porous filter 26 is disposed on the blow-by gas outlet side. An oil reservoir 27 is formed at the lower end of both porous filters 25 and 26 at a position lower than the filters, and the oil reservoir 27 communicates with the upper space 12 of the cylinder head 11, that is, into the crankcase, via the umbrella-shaped check valve 8. do. That is, the oil absorbed by the porous filters 25 and 26 is temporarily stored in the oil reservoir 27 via the oil passage 34, and when the oil reaches a predetermined amount, the umbrella-shaped check valve 28 is opened by the weight of the oil. , passages 31, 3 passing through the member 29 holding the valve 28.
2, the oil in the oil reservoir 27 flows back into the crankcase. Note that the seal member 30 is
This ensures sealing between the upper space 12 and the filter downstream space 33.

In this way, since the filters 25 and 26 are porous bodies with high oil particle collection efficiency, the blow-by gas flowing into the gas-liquid separation chamber 23 first collides with the coarse-mesh filter 25 and the flow velocity is reduced. The contained oil becomes oily and adheres to the filter 25. The atomized oil particles having a relatively small mass that have passed through the filter 25 are absorbed by a fine-mesh porous filter 26. Both porous filters 25 and 26 effectively separate the oil component contained in the blow-by gas. Further, since both filters 25 and 26 are arranged vertically, oil droplets adhering to the filters 25 and 26 tend to fall off due to their own weight. In other words, filter 2
The oil collected at 5 and 26 moves downward under its own weight, passes through the seal member 30, and is collected and temporarily stored in an oil reservoir 27 located at a low position. By removing oil and securing air passages in the upper portions of the filters 25 and 26, the blow-by gas from which oil has been removed passes through the ventilation passages to the outlet port as shown by arrow m in the figure. It leaks on the 24th.

[Effect of idea]

When using a foamed metal porous filter as an oil separation means, a filter with as fine mesh as possible is effective in separating oil components contained in blow-by gas. However, when a fine-mesh filter is installed, clogging is likely to occur. According to the present invention, by arranging the coarse-mesh filter upstream of the fine-mesh filter, it is more effective in protecting the fine-mesh filter from clogging. By disposing such a fine-mesh porous filter, there is an effect that fine foreign matter contained in the blow-by gas can also be absorbed.

[Brief explanation of the drawing]

The drawing is a sectional view showing an embodiment in which an oil separator according to the present invention is installed in an internal combustion engine. DESCRIPTION OF SYMBOLS 10... Internal combustion engine, 11... Cylinder head, 12... Cylinder head upper space part, 13...
... Cylinder head cover, 20 ... Oil separator, 21 ... Case, 22 ... Bumpful member,
23... Gas-liquid separation chamber, 24... Outlet port, 25
... Coarse mesh metal foam porous filter, 26...
...Fine metal foam porous filter, 27...
...Oil reservoir, 28...Check valve, 30...
...Sealing member, 33...Filter downstream space.

Claims (1)

[Scope of utility model registration request] A bottom-open case for separating blow-by gas into gas and liquid is integrally formed on a cylinder head cover that covers the space above the cylinder head in which the valve mechanism of an internal combustion engine is disposed, and the bottom-open part of the case A baffle member is fixed to the case, and a gas-liquid separation chamber is formed inside the case, and a coarse-mesh foam metal porous filter is installed on the blow-by gas inflow side of the gas-liquid separation chamber, and a fine-mesh porous filter is installed on the blow-by gas outflow side. Porous filters made of foamed metal are arranged vertically in series along the flow of blow-by gas, and an oil reservoir is formed at the lower end of both of the porous filters at a position lower than the two filters, and an oil reservoir is formed at the bottom of the oil reservoir. The oil reservoir is communicated with the space above the cylinder head through an umbrella-shaped check valve installed in the gas-liquid separation chamber, and the space above the cylinder head is connected to the space on the downstream side of the porous filter in the gas-liquid separation chamber. An oil separator, the oil separator is provided with an outlet port for blow-by gas in an upper part of the space on the downstream side of the porous filter.