JP4458537B2 - Oil separation device for blow-by gas in internal combustion engines - Google Patents

Description

  The present invention relates to an apparatus for separating oil contained in a blow-by gas in an internal combustion engine when guiding the blow-by gas in the crankcase or the like to a blow-by gas processing unit such as an intake system.

  Conventionally, as one of the oil separation devices for blow-by gas, for example, as described in Patent Documents 1 and 2, a gas-liquid separation chamber is provided in a recessed manner on the side of a cylinder block or a cylinder head in an internal combustion engine. The lid for closing the gas-liquid separation chamber is detachably attached. The gas-liquid separation chamber has a blow-by gas inlet at the bottom and a blow-by gas outlet at the top. By forming a labyrinth passage in which the blow-by gas flows in a zigzag direction from the blow-by gas inlet to the blow-by gas outlet in the left-right direction, a labyrinth passage forming member provided on the inner surface of the lid plate is used. Some of them are configured to separate oil in blow-by gas.

In this case, in Patent Document 1, the labyrinth passage forming member provided on the cover plate is contacted with the labyrinth passage forming member provided integrally on the cylinder block side when the cover plate is attached to the cylinder block or the like. Thus, a zigzag labyrinth passage is formed in the left-right direction. Patent Document 2 discloses that a labyrinth passage forming member provided on a lid plate is attached to the cylinder block or the like. In this case, a zigzag labyrinth passage is formed in the left-right direction by approaching the inner wall surface extending in the vertical direction among the inner wall surfaces of the gas-liquid separation chamber on the cylinder block side.
JP 2002-106319 A JP-A-4-342864

  However, as in Patent Document 1, when the labyrinth passage forming member provided on the cover plate is attached to the cylinder block or the like, at the same time, the labyrinth passage forming member integrally provided on the cylinder block side is contacted. Doing so may cause noise because the labyrinth passage forming member on the lid plate side may repeatedly move away from or contact the labyrinth passage forming member on the cylinder block side due to vibration or the like. There is a problem that is large.

  On the other hand, when configured as in Patent Document 2, the labyrinth passage forming member on the cover plate side is not in contact with the cylinder block side. Part of the blow-by gas that flows inside passes through a narrow gap between the labyrinth passage forming member and the inner wall surface of the gas-liquid separation chamber on the cylinder block side, and blows through the labyrinth passage as a shortcut. There has been a problem that the performance of the system is greatly reduced.

  It is a technical object of the present invention to provide an oil separator that solves these problems simultaneously.

In order to achieve this technical problem, claim 1 of the present invention provides:
“Inside of the cylinder block or cylinder head in an internal combustion engine, a gas-liquid separation chamber is provided with a recess, and a lid for closing the gas-liquid separation chamber is detachably attached. A labyrinth passage having a blow-by gas inlet and a blow-by gas outlet at an upper portion, and a blow-by gas flowing in a zigzag direction from the blow-by gas inlet to the blow-by gas outlet in the gas-liquid separation chamber, In the oil separator configured to be formed by a labyrinth passage forming member attached to the inner surface of the lid plate, a vertical extending in the vertical direction on the inner surface of the gas-liquid separation chamber among the labyrinth passage forming members provided in the lid body. A plate member is attached to the lid so as to extend in a vertical direction parallel to or substantially parallel to the vertical inner wall surface at a portion close to the inner wall surface. At least one of the upper end and the lower end of the plate member is provided with an extension extending in parallel or substantially in parallel with the longitudinal inner wall surface.
It is characterized by that.

Further, claim 2 of the present invention is
“In the description of claim 1, the plate member is provided in a portion of the labyrinth passage close to the blow-by gas inlet.”
It is characterized by that.

  By configuring in this way, a part of the blow-by gas flowing in the labyrinth passage in a state where the labyrinth passage forming member and the plate member provided on the lid side do not contact the cylinder block or the cylinder head side, Blowing through the labyrinth passage forming member as a shortcut to the labyrinth passage from a portion close to the vertical inner wall surface in the gas-liquid separation chamber can be reliably reduced by the plate member.

  On the other hand, the blow-by gas flowing in the gap between the vertical inner wall surface and the plate member in the gas-liquid separation chamber is in contact with both the vertical inner wall surface and the plate member provided with the extension, and has a long path. By flowing, the oil in the blow-by gas can be reliably separated so as to adhere to both surfaces of the vertical inner wall surface and the plate member having the extension.

  As a result, the performance of oil separation with respect to blow-by gas can be significantly improved without causing an increase in noise.

  In addition, the plate member is attached to the lid similarly to the labyrinth passage forming member, so that both the plate member and the labyrinth passage forming member are attached to the lid. Since the lid can be attached to the cylinder block or the cylinder head, it is easy to assemble and disassemble regardless of the provision of the plate member, and the labor required for this can be greatly reduced.

  In addition, since the strength of the lid is improved by attaching the plate member thereto, the membrane vibration generated in the lid can be reduced and the lid can be attached to a cylinder block or the like. The number of bolts can be reduced.

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

  In these drawings, reference numeral 1 denotes a cylinder block or a cylinder head in an internal combustion engine, and a gas-liquid separation chamber 2 which is rectangular in the vertical direction is formed in a recessed manner on a side surface 1a of the cylinder block 1 or the cylinder head. Yes.

  This gas-liquid separation chamber 2 is closed so as to be sealed with a lid 3 made of a metal plate that is detachably attached to the cylinder block 1 or the side surface 1a of the cylinder head with a plurality of bolts 10. A blowby gas inlet 4 from a crankcase or a valve operating mechanism chamber (not shown) is opened in the lower part, and a blowby gas outlet 5 to an intake system (not shown) is opened in the upper part.

  However, in the figure, the blow-by gas inlet 4 is provided on the cylinder block 1 or the cylinder head side, and the blow-by gas outlet 5 is provided on the lid 3 side. However, the blow-by gas inlet 4 is provided on the lid body. The blow-by gas outlet 5 may be provided on the side of the cylinder block 1 or on the cylinder head side, respectively.

  A labyrinth passage forming member 6 formed by bending a metal plate into a S shape in a side view (FIG. 1) is welded to the inner surface of the lid 3 on the gas-liquid separation chamber 2 side so as to extend in the lateral direction. As shown by the arrows, a labyrinth passage 7 in which the blowby gas flows from the blowby gas inlet 4 to the blowby gas outlet 5 in a zigzag direction in the left-right direction is formed in the gas-liquid separation chamber 2. To do.

  Of the left and right side surfaces of the labyrinth passage forming member 6, one of the left and right vertical inner wall surfaces 2 a and 2 b extending in the vertical direction in the gas-liquid separation chamber 2 is one vertical inner wall surface 2 a close to the blow-by gas inlet 4. A plate member 8 configured to prevent the blow-by gas flowing in the labyrinth passage 7 from coming into contact with the one vertical inner wall surface 2a is disposed on one side surface adjacent to the one vertical inner wall surface 2a. The lid 3 is attached by welding or the like so as to extend in the vertical direction in parallel or substantially in parallel.

  Of the left and right side surfaces of the labyrinth passage forming member 6, the other vertical inner wall surface 2 b far from the blow-by gas inlet 4 out of the left and right vertical inner wall surfaces 2 a and 2 b extending in the vertical direction in the gas-liquid separation chamber 2. A plate member 9 configured to prevent the blow-by gas flowing in the labyrinth passage 7 from coming into contact with the other vertical inner wall surface 2b is disposed on the other side surface adjacent to the other vertical inner wall surface 2b. The lid 3 is attached by welding or the like so as to extend in the vertical direction in parallel or substantially in parallel.

  Moreover, of the two plate members 8 and 9, one plate member 8 in a portion near the blow-by gas inlet 4 has the blow-by gas inlet 4 parallel to or substantially parallel to the one longitudinal inner wall surface 2a at the lower end thereof. An extension portion 8a extending toward the blow-by gas outlet 5 is integrally provided at the upper end of the extension portion 8a extending toward the blow-by gas outlet 5 in parallel with or substantially parallel to the one longitudinal inner wall surface 2a. Of the members 8 and 9, the other plate member 9 in a portion far from the blow-by gas inlet 4 is extended at the upper end thereof toward the blow-by gas outlet 5 in parallel or substantially parallel to the other vertical inner wall surface 2b. The part 9a is provided integrally.

  In this configuration, the blow-by gas that has flowed into the gas-liquid separation chamber 2 from the blow-by gas inlet 4 flows in the labyrinth passage 7 in the labyrinth passage forming member 6 provided in the gas-liquid separation chamber 2 in a zigzag manner in the left-right direction.

  A part of the blow-by gas flowing in the labyrinth passage 7 shortcuts the labyrinth passage from the portion of the labyrinth passage forming member 6 adjacent to the left and right vertical inner wall surfaces 2a, 2b in the gas-liquid separation chamber 2. Blowing through can be reliably reduced by the plate members 8 and 9.

  On the other hand, the blow-by gas flowing in the gap between the vertical inner wall surfaces 2a, 2b and the plate members 8, 9 in the gas-liquid separation chamber 2 is separated from the vertical inner wall surfaces 2a, 2b and the extended portions 8a, 8b, respectively. , 9a in contact with both of the plate members 8 and 9 and flowing over a long distance, the oil in the blow-by gas is supplied to the longitudinal inner wall surfaces 2a and 2b and the extensions 8a, 8b and 9a, respectively. It can be surely separated so as to adhere to both surfaces of the plate members 8 and 9 provided with.

  In the above-described embodiment, the case where the plate members 8 and 9 are provided on the left and right side surfaces of the labyrinth passage forming member 6 is shown. However, the present invention is not limited to this, and in addition to these plate members 8 and 9, Alternatively, instead of the two plate members 8 and 9, a plate member 11 extending in parallel or substantially in parallel with the inner wall surface 2c at the back of the gas-liquid separation chamber 2 is provided as shown by a two-dot chain line in FIG. Needless to say, it may be configured as follows. Of course, it goes without saying that either one or both of the upper end and the lower end of the plate member 11 are integrally provided with an extension portion, like the plate members 8 and 9.

It is a vertical front view which shows embodiment of this invention. FIG. 2 is a side view taken along the line II-II in FIG. 1. FIG. 3 is a sectional view taken along line III-III in FIG. 1. FIG. 4 is a sectional view taken along line IV-IV in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder block or cylinder head 2 Gas-liquid separation chamber 2a, 2b Vertical inner wall surface 3 Lid body 4 Blow-by gas inlet 5 Blow-by gas outlet 6 Labyrinth passage formation member 7 Labyrinth passage 8, 9, 11 Plate member

Claims (2)

  A gas-liquid separation chamber is provided in the side of the cylinder block or cylinder head in the internal combustion engine, and a lid for closing the gas-liquid separation chamber is detachably attached. A labyrinth passage that opens a gas inlet and a blow-by gas outlet at the top, and that allows the blow-by gas to flow in a zigzag direction from the blow-by gas inlet to the blow-by gas outlet in the gas-liquid separation chamber, In the oil separator configured to be formed by a labyrinth passage forming member attached to the inner surface of the lid plate, a vertical inner portion extending in the vertical direction on the inner surface of the gas-liquid separation chamber among the labyrinth passage forming members provided in the lid body. A plate member is attached to the lid body so as to extend in a vertical direction parallel to or substantially parallel to the vertical inner wall surface at a portion close to the wall surface. Only provided, the at least one of the upper and lower ends of the plate member, the oil separator of the blow-by gas in an internal combustion engine, characterized in that providing an extension extending parallel or substantially parallel to the longitudinal inner wall surface.   2. The blow-by gas oil separation device in an internal combustion engine according to claim 1, wherein the plate member is provided in a portion of the labyrinth passage close to the blow-by gas inlet.

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