JP6130663B2 - Oil separation structure - Google Patents

Description

  The present invention relates to an oil separation structure for separating oil from blow-by gas.

  In general, in vehicles such as trucks, blow-by gas is returned to the engine intake pipe so that blow-by gas generated in the crankcase of the engine is not released into the atmosphere. And since oil mist is contained in blow-by gas, in addition to a normal breather, oil is separated from blow-by gas by mounting a primary breather on the engine head cover (see, for example, Patent Document 1). ).

JP 2007-247448 A

  However, if the blow-by gas generated in the crankcase is routed through the primary breather and the breather, it becomes difficult to route around the engine, so a simpler oil separation structure is required.

  Then, an object of this invention is to provide the oil separation structure which can isolate | separate oil from blow-by gas with a simple structure.

  An oil separation structure according to the present invention is an oil separation structure that separates oil from blow-by gas, and is connected to an engine crankcase to extract blow-by gas from the crankcase, and a first reflux pipe And a gas / liquid separation device connected to the crankcase, and having a separation part that separates oil from blow-by gas and a pipe part that returns the oil separated in the separation part to the crankcase .

  According to the oil separation structure of the present invention, the blow-by gas generated in the crankcase is directly taken out from the first reflux pipe, and the oil is separated by the separation unit of the gas-liquid separation device connected to the crankcase. The And the oil isolate | separated from blow-by gas returns to a crankcase through the pipe line part of a gas-liquid separator. As described above, the structure in which the gas-liquid separator is connected to the crankcase enables oil to be separated from the blow-by gas with a simple structure.

  In this case, a plurality of backflow prevention members that bypass the oil flowing through the pipe line part may be disposed in the pipe line part.

  By providing such a backflow prevention member, even if the vehicle is tilted and the oil stored in the oil pan flows back to the pipe section, the backflow prevention member receives the oil to weaken the backflow momentum. Therefore, it is possible to prevent the oil from flowing back into the gas-liquid separator.

  Further, the pipe line portion can be closed by a backflow preventing member in a side view.

  By disposing the backflow preventing member in this way, it is possible to further weaken the momentum of the oil that flows back from the oil pan.

  According to the present invention, oil can be separated from blow-by gas with a simple structure.

It is a mimetic diagram of an oil separation structure concerning an embodiment. It is a fragmentary sectional view of an oil separation structure. It is a schematic diagram which shows the example of arrangement | positioning of a backflow prevention member.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted.

  FIG. 1 is a schematic diagram of an oil separation structure according to an embodiment. As shown in FIG. 1, an oil separation structure 1 according to this embodiment is attached to an engine 2 of a vehicle.

  One or more cylindrical cylinders 5 in which the piston 4 reciprocates are formed on the upper part of the engine block 3 constituting the engine 2. An intake port and an exhaust port are formed in the upper part of the cylinder 5, and an intake pipe 6 for intake of gas into a combustion chamber in the cylinder 5 is connected to the intake port. An exhaust pipe 7 for exhausting combustion gas from the combustion chamber is connected.

  A skirt portion 9 that accommodates a crank (not shown) connected to the piston 4 and is connected to the oil pan 8 is formed at the lower portion of the engine block 3. Oil for lubricating each part of the engine 2 is stored in the oil pan 8. The skirt portion 9 and the oil pan 8 constitute a crankcase.

  The oil separation structure 1 according to the present embodiment includes a first reflux pipe 11 connected to the skirt portion 9 and a centrifugal breather connected to the first reflux pipe 11 and the skirt portion 9 or the oil pan 8. 12, and a second reflux line 13 connected to the centrifugal breather 12 and the intake line 6.

  The first reflux pipe 11 is a gas reflux pipe that takes out blow-by gas from the skirt portion 9 or the crankcase of the oil pan 8. The first reflux conduit 11 communicates with a first opening 15 formed in the skirt portion 9.

  The centrifugal breather 12 is a gas-liquid separator that separates oil from blow-by gas sent from the first reflux pipe 11. FIG. 2 is a partial cross-sectional view of the oil separation structure. As shown in FIGS. 1 and 2, the centrifugal breather 12 is connected (fixed) to the skirt portion 9 or the crankcase of the oil pan 8, and includes a separation portion 16 that separates oil from blow-by gas, and a separation portion 16. And a conduit portion 17 for returning the oil separated in step 1 to the oil pan.

  The separation unit 16 is provided with blades (not shown) that rotate by oil drive. By rotating the blades, the oil can be centrifuged from the blow-by gas sent to the centrifugal breather 12. ing. For this reason, the oil separated from the blow-by gas and the drive oil used for rotating the blades are discharged from the centrifugal breather 12. And the 2nd recirculation | reflux line 13 for discharging the blowby gas which isolate | separated oil is connected with the side surface of the centrifugal breather 12. As shown in FIG.

  The duct portion 17 is fixed to the bottom surface of the separation portion 16 and is connected (fixed) to the crankcase. In the pipe line portion 17, a flow path space A communicating with the separation portion 16 and the second opening 18 formed in the skirt portion 9 or the oil pan 8 is formed. For this reason, the pipe line part 17 can return the oil separated from the blow-by gas and the drive oil used for rotating the blades to the oil pan 8.

  In the flow path space A, a plurality of backflow prevention members 20 that suppress backflow of oil stored in the oil pan 8 are arranged. The backflow prevention member 20 is a member that bypasses the oil flowing through the flow path space A of the pipe line portion 17. And the flow-path space A of the pipe line part 17 is obstruct | occluded by the some backflow prevention member 20 in the side view. Here, the side view refers to a side view of the vehicle. The backflow prevention member 20 may have any shape and any number as long as the oil flowing in the flow path space A of the pipe line portion 17 can be bypassed to suppress the backflow of the oil stored in the oil pan 8. May be. Further, the backflow preventing member 20 may be arranged in any manner as long as it can block the flow path space A of the duct portion 17 in a side view.

  3A and 3B are schematic views showing an arrangement example of the backflow prevention member, in which FIG. 3A is a longitudinal sectional view, and FIG. 3B is a sectional view taken along line II-II shown in FIG. The arrows shown in FIGS. 3A and 3B indicate the direction of the side view when the flow path space A is viewed from within the crankcase. In the arrangement example shown in FIG. 3, the three backflow prevention members 20 a to 20 c are arranged below the flow path space A, and the one backflow prevention member 20 d is arranged above the flow path space A.

  The backflow prevention member 20a and the backflow prevention member 20b disposed on the lower side are disposed closer to the crankcase than the backflow prevention member 20d disposed on the upper side. A gap through which oil flows is formed between the backflow prevention member 20a and the backflow prevention member 20b.

  The backflow prevention member 20c disposed on the lower side is disposed on the opposite side of the crankcase from the backflow prevention member 20d disposed on the upper side. And the backflow prevention member 20c is arrange | positioned in the position which fills the clearance gap between the backflow prevention member 20a and the backflow prevention member 20b in side view, The clearance gap through which oil flows is formed in the both sides.

  The backflow preventing member 20d disposed on the upper side is disposed between the backflow preventing member 20a and the backflow preventing member 20b and the backflow preventing member 20c, and is disposed on all the backflow preventing members 20a to 20c disposed on the lower side in a side view. It extends to the position where it overlaps.

  Next, the operation of the oil separation structure 1 according to this embodiment will be described.

  First, blow-by gas generated in the crankcase is directly taken out from the first reflux pipe connected to the first opening 15, and the oil is centrifuged by the separation part 16 of the centrifugal breather 12 connected to the crankcase. Is done. The blow-by gas from which the oil has been centrifuged by the separation unit 16 is returned from the second reflux line 13 to the intake line 6. On the other hand, the oil centrifugally separated from the blow-by gas by the separation unit 16 and the drive oil of the separation unit 16 are returned to the crankcase through the flow path space A formed in the pipe portion 17 of the centrifugal breather 12.

  As described above, the centrifugal breather 12 is connected to the crankcase, whereby the oil can be separated from the blow-by gas with a simple structure.

  Since the plurality of backflow prevention members 20 are provided in the flow path space A, even if the vehicle is tilted and the oil stored in the oil pan 8 flows back into the flow path space A of the pipe line portion 17. Since the backflow prevention member 20 receives the oil, the backflow momentum is weakened, so that the oil can be prevented from flowing back to the separation part 16 of the centrifugal breather 12.

  Furthermore, since the backflow prevention member 20 is disposed so as to block the flow path space A of the pipe line portion 17 in a side view of the vehicle, the momentum of the oil flowing back from the oil pan 8 can be further reduced.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the centrifugal breather is used as the gas-liquid separator. However, any device may be used as the gas-liquid separator as long as the oil can be separated from the blowby gas. Moreover, although the said embodiment demonstrated as what a backflow prevention member is arrange | positioned in a pipe line part, if the backflow of oil does not become a problem, it is not necessary to necessarily arrange a backflow prevention member in a pipe line part. In the above-described embodiment, the backflow prevention member has been described as being disposed so as to close the flow path space in a side view. However, if the backflow of oil can be prevented, the backflow prevention member is not necessarily disposed in this manner. It does not have to be.

DESCRIPTION OF SYMBOLS 1 ... Oil separation structure, 2 ... Engine, 3 ... Engine block, 4 ... Piston, 5 ... Cylinder, 6 ... Intake line, 7 ... Exhaust line, 8 ... Oil pan, 9 ... Skirt part, 11 ... First reflux Pipe, 12 ... Centrifugal breather (gas-liquid separator), 13 ... Second reflux pipe, 15 ... First opening, 16 ... Separation section, 17 ... Pipe section, 20 ... Backflow prevention member, 20a ... Backflow prevention Member, 20b ... backflow prevention member, 20c ... backflow prevention member, 20d ... backflow prevention member, A ... flow path space.

Claims (3)

A vehicle oil separation structure for separating oil from blow-by gas,
A first reflux line connected to the crankcase of the engine to extract blow-by gas from the crankcase;
A separation part connected to the first reflux pipe for separating oil from the blow-by gas; and a pipe line part for returning the oil separated in the separation part to the crankcase; connected to the crankcase Gas-liquid separation device,
With
The pipe line portion communicates with an opening formed in the skirt portion or oil pan of the crankcase, and extends from the opening toward the side of the crankcase.
A plurality of backflow prevention members for bypassing the oil flowing through the pipe line part are disposed in the pipe line part,
The pipe section is closed by the backflow prevention member when viewed in the direction in which the pipe section extends .
Vehicle oil separation structure. The backflow prevention member is
A first backflow prevention member disposed on the lower side of the flow path space communicated with the opening in the duct portion;
A second backflow prevention member disposed on the upper side of the flow path space,
The oil separation structure for a vehicle according to claim 1. The first backflow prevention member disposed closest to the crankcase side is disposed closer to the crankcase than the second backflow prevention member disposed closest to the crankcase.
The oil separation structure for a vehicle according to claim 2.

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