JP6198545B2 - Closed breather system - Google Patents

Description

  The present invention relates to a closed breather system.

  The blow-by gas that leaks into the crankcase through the gap between the piston rings during the compression stroke and explosion stroke of the engine fills the crankcase and the cylinder head cover that communicates with the crankcase. The crankshaft and connecting rod are moving at high speed in the crankcase, and the rocker arm and valve are operating in the cylinder head cover communicating with the crankcase. The inside is filled with oil mist.

  For this reason, if the blow-by gas is released into the atmosphere as it is, the oil mist mixed with the blow-by gas may be discharged to the outside. Therefore, as shown in FIG. 6, the oil mist in the blow-by gas 1 A ventilator 2 (CCV: Closed Crankcase Ventilator) with a built-in filter net or labyrinth structure for separating and recovering gas is provided, and the blow-by gas 1 extracted from the cylinder head cover 4 of the engine 3 via the gas extraction pipe 5 is provided in the ventilator 2. The oil mist is separated and recovered by passing it through and then returned to the intake pipe 7 via the gas return pipe 6, and the oil 8 recovered by the ventilator 2 is returned to the oil pan (not shown) via the oil recovery pipe 9. Yes.

  In FIG. 6, 10 is an air cleaner, 11 is a turbocharger, 11a is a compressor, 11b is a turbine, 12 is an intercooler, 13 is intake air, and 14 is exhaust gas.

  Generally, a system for processing the blow-by gas 1 as described above in a closed circuit is called a closed breather system. As prior art document information related to this type of closed breather system, the following patent document 1 and the like are disclosed. is there.

JP 2003-278523 A

  However, in such a conventional closed breather system, although the oil mist contained in the blow-by gas 1 is separated and recovered by the ventilator 2, it is difficult to completely remove the oil mist by the ventilator 2. A small amount of oil mist that did not flow enters the intake pipe 7 along with the flow of the blow-by gas 1, adheres to the wall surface of the intake pipe 7, flows down to the air cleaner 10, and drops from the air cleaner 10. Then, there was a problem of soiling the ground.

  In particular, in a transport vehicle such as a truck, since the air cleaner 10 is attached to the chassis, there are many cases where the air cleaner 10 is laid out at a low position, and the portion from the connection point of the gas return pipe 6 to the air cleaner 10 in the intake pipe 7 tends to be inclined downward. While the vehicle is stopped and loading / unloading work is performed, the customer's premises may be soiled, and measures to prevent dripping of oil from the air cleaner 10 are required.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a closed breather system that can prevent the problem that oil drops from an air cleaner and soils the ground.

The present invention is a closed breather system in which blow-by gas extracted from the engine side is returned to an intake pipe through a gas return pipe, and the intake pipe is connected between a connection portion of the gas return pipe in the intake pipe and an air cleaner. An oil pit for containing oil that has flowed down the wall surface is provided, and this oil pit covers an opening formed at the lowermost end at an appropriate position in the longitudinal direction of the intake pipe and the opening from below. An oil recovery container mounted on the outer periphery of the intake pipe and having an oil discharge port at the bottom thereof, and the oil pan and the oil pan so that the oil can flow down from the bottom of the oil pit and recovered in the oil pan of the engine The oil recovery port of the oil recovery container is connected via a connecting pipe .

Thus, even if the oil mist enters the intake pipe along with the flow of blow-by gas and adheres to the wall surface of the intake pipe and flows down as oil droplets, Drops are stored in the oil pit before reaching the air cleaner, and flow down from the bottom of the oil pit via the connecting pipe and collected in the engine oil pan , so that dripping of oil from the air cleaner is prevented in advance. become.

  Further, when the oil pit is configured in this way, it is preferable that the oil pit opening is configured by a plurality of drill holes that are drilled so as not to overlap each other by drilling. For example, it is possible to easily drill the oil pit opening using a general-purpose drill tool, and the pipe wall portion remains between the openings so that the pipes around the openings can be inserted into the pipes. It is difficult for warping to occur.

  In addition, the oil recovery container is covered with an oil recovery container so that the periphery of the opening of the oil pit is larger than the required surplus allowance, and the surplus allowance portion projects inward along the entire circumference of the upper opening of the oil recovery container. In this case, even if the oil stored in the oil pit is swung by the vehicle vibration, the oil return portion prevents the oil from returning to the intake pipe side. become.

  According to the above-described closed breather system of the present invention, various excellent effects as described below can be obtained.

(I) According to the first aspect of the present invention, the oil droplets that have entered the intake pipe accompanying the flow of blow-by gas are accommodated in the oil pit before reaching the air cleaner, and the oil pit Since it can be made to flow down from the bottom part of the engine through the connecting pipe and collected in the oil pan of the engine, the problem of oil dripping from the air cleaner and soiling the ground can be prevented.

(II) According to the invention described in claim 2 of the present invention, since the opening of the oil pit can be easily drilled using a general-purpose drill tool, the processing cost of the oil pit can be kept low. In addition, since the tubular portion remains between the openings, it is possible to make it difficult for the pipes around the openings to be warped, so that an increase in pressure loss due to such warping is avoided. be able to.

(III) According to the invention described in claim 3 of the present invention, even if the oil stored in the oil pit is swung by the vibration of the vehicle, the oil return portion prevents the oil from returning to the intake pipe side. Therefore, the dripping of oil from the air cleaner can be prevented more reliably.

It is a side view which shows an example of the form which implements this invention. It is an arrow view of the II-II direction of FIG. It is a figure which shows the example which processed the opening part by overlapping several drill holes partially. FIG. 4 is a cross-sectional view rotated 90 ° right as viewed in the direction of arrows IV-IV in FIG. It is sectional drawing rotated 90 degrees right of the VV arrow of FIG. It is the schematic which shows a prior art example.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an example of an embodiment for carrying out the present invention, and the parts denoted by the same reference numerals as those in FIG. 6 represent the same items.

  As shown in FIGS. 1 and 2, in this embodiment, the blow-by gas 1 extracted from the engine 3 (see FIG. 6) side is returned to the intake pipe 7 via the gas return pipe 6 in the same manner as in FIG. With regard to the closed breather system, an oil pit 15 is provided between the connection portion of the gas return pipe 6 in the intake pipe 7 and the air cleaner 10 to receive the oil 8 that has flowed down the wall surface of the intake pipe 7. It is characterized in that the oil 8 can flow down from the bottom of the intake pipe and can be collected at a required place, more specifically, an opening formed at the lowermost end at an appropriate position in the longitudinal direction of the intake pipe 7 16 and an oil recovery container 18 mounted on the outer periphery of the intake pipe 7 so as to cover the opening 16 from below and having an oil discharge port 17 at the bottom thereof. 15 constitute, through the connecting pipe 19 to the oil discharge port 17 has to be connected with the oil pan of the engine 3 (see FIG. 6) (not shown).

  Here, when the opening 16 of the oil pit 15 is machined, it can be easily drilled using a general-purpose drill tool. However, as shown in FIGS. 3 and 4, a plurality of drill holes are partially formed. If the opening 16 is processed in a superimposed manner, the pointed remaining portion x formed in the overlapped portion is warped into the pipe, which causes an increase in pressure loss, and as shown by a chain line in FIG. A plurality of drill holes are drilled so as not to overlap each other by drilling to form openings 16, and a tubular portion is left between the openings 16 so that the inside of the pipe around the openings 16 It makes it difficult to cause warping.

  Further, as shown in FIGS. 2 and 5, the periphery of the opening 16 of the oil pit 15 is covered with an oil recovery container 18 so as to be larger by a required surplus amount. The surplus portion extends over the entire circumference of the upper opening to form an oil return portion 20.

Thus, even if the oil mist enters the intake pipe 7 along with the flow of the blow-by gas 1 and adheres to the wall surface of the intake pipe 7 and flows down as a droplet of the oil 8, The droplets of the oil 8 are accommodated in the oil pit 15 before reaching the air cleaner 10, and flow down from the bottom of the oil pit 15 through the connecting pipe 19, and an oil pan (not shown) of the engine 3 (see FIG. 6). ) , The dripping of the oil 8 from the air cleaner 10 is prevented in advance.

  Further, as described above, since the opening 16 of the oil pit 15 is constituted by a plurality of drill holes that are drilled so as not to overlap each other, the oil pit 15 can be easily oiled using a general-purpose drill tool. The openings 16 of the pits 15 can be drilled, and the tubular portions remain between the openings 16 so that the pipes around the openings 16 are hardly warped.

  Further, the periphery of the opening 16 of the oil pit 15 is covered with an oil recovery container 18 so as to be larger than the required surplus allowance, and the surplus allowance portion protrudes inward along the entire circumference of the upper opening of the oil recovery container 18. Since the oil return portion 20 is configured, even if the oil 8 accommodated in the oil pit 15 swings due to vehicle vibration, the oil return portion 20 causes the oil 8 to return back to the intake pipe 7 side. Will be blocked.

Therefore, according to the above embodiment, the droplets of the oil 8 that have entered the intake pipe 7 along with the flow of the blow-by gas 1 are accommodated in the oil pit 15 before reaching the air cleaner 10, Since it can flow down from the bottom through the connecting pipe 19 and be collected in the oil pan (not shown) of the engine 3 (see FIG. 6), the problem that the oil 8 drops from the air cleaner 10 and soils the ground is prevented. can do.

  Further, since the opening 16 of the oil pit 15 can be easily drilled using a general-purpose drill tool, the processing cost of the oil pit 15 can be reduced at a low cost. Since the pipe wall portion remains, it is possible to make it difficult for the pipes around the openings 16 to be warped, so that an increase in pressure loss due to such warping can be avoided.

  Furthermore, even if the oil 8 accommodated in the oil pit 15 is swung by the vibration of the vehicle, the oil return portion 20 can prevent the oil 8 from returning to the intake pipe 7 side. The dripping of the oil 8 from 10 can be prevented.

Incidentally, closed breather system of the present invention, it is needless to say that such is intended to be limited only to the above embodiments rather, various modifications may be made without departing from the scope and spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Blow-by gas 3 Engine 6 Gas return pipe 7 Intake pipe 8 Oil 10 Air cleaner 15 Oil pit 16 Opening part 17 Oil discharge port 18 Oil recovery container 19 Connection pipe 20 Oil return part

Claims (3)

A closed breather system in which blow-by gas extracted from the engine side is returned to the intake pipe through the gas return pipe, and flows down the wall of the intake pipe between the connection portion of the gas return pipe in the intake pipe and the air cleaner. An oil pit for containing oil is provided, and the oil pit has an opening formed at a lowermost end at an appropriate position in the longitudinal direction of the intake pipe, and an outer periphery of the intake pipe so as to cover the opening from below. And an oil recovery container having an oil discharge port at the bottom thereof. The oil pan and the oil recovery container are arranged so that the oil can flow down from the bottom of the oil pit and can be recovered in the engine oil pan. A closed breather system characterized in that the oil discharge port is connected via a connecting pipe . 2. The closed breather system according to claim 1 , wherein the oil pit opening is constituted by a plurality of drill holes which are drilled so as not to overlap each other by drilling. Cover the periphery of the opening of the oil pit with an oil recovery container that is larger than the required surplus allowance, and the surplus allowance part projects over the entire circumference of the upper opening of the oil recovery container to form an oil return part The closed breather system according to claim 1 , wherein the closed breather system is configured as described above.

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