JP2010203299A - Oil separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent oil from being carried away by blow back from a cam chamber, in an oil separator disposed in a head cover of a cylinder head. <P>SOLUTION: A pressure regulating hole 32 is formed at an opposite side to a flow-in port 16 over an oil removing hole 24 of an oil pool 22 on an baffle plate 14 to separate the oil removing hole 24 and the pressure regulating hole 32. Connection and communication between a separator chamber 18 and a cam chamber 34 is provided through the separated pressure regulating hole 32. Pressure in the separator chamber 18 is regulated thereby, to prevent the separator chamber 18 from being subjected to negative pressure causing blow back from the oil pool 22. Consequently, oil is prevented from being carried away from the cam chamber 34 by blow back. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an oil separator provided in a head cover of a cylinder head.

  For example, in Patent Document 1, while oil supplied from an oil return passage to a camshaft or the like is returned into the crankcase, only blow-by gas is removed from a blow-by gas passage provided completely separated from the return passage. When the pressure in the blow-by gas passage is equal to or higher than a predetermined value, the oil separated by the oil separator by the valve means is returned to the rocker case, and the pressure in the blow-by gas passage is held at the predetermined value. Blowby gas recirculation devices have been proposed.

  Patent Document 2 proposes a blow-by gas oil separation device for an internal combustion engine that sufficiently removes oil in blow-by gas to prevent air cleaner contamination and clogging of a vaporizer jet. Yes.

  In the technique described in Patent Document 2, the partition plate prevents oil splashes generated by the valve operating mechanism housed in the first chamber of the locker chamber from being directly scattered in the second chamber, The throttle communicating the second chamber and the third chamber alleviates the pressure fluctuation in the crank chamber transmitted to the third chamber, reduces the air flow in the third chamber, and draws the oil in the blow-by gas to the bottom of the third chamber. Accumulate on. The drain hole returns the oil accumulated in the third chamber to the second chamber, so that the oil in the blow-by gas is separated.

  Further, in Patent Document 3, a die-cast rocker cover in which a first oil chamber having an oil return hole is formed on the upper wall surface of the rocker cover serving as the bottom wall of the separator chamber is integrally enclosed with the first oil chamber. A surrounding wall having a concave cross section is formed, a second oil chamber is formed by using packing attached to the rocker cover, and an upper end position of the surrounding wall forming the second oil chamber is formed in the first oil chamber. An oil separating device for blow-by gas in an internal combustion engine has been proposed in which the oil return hole is always higher than the oil return hole so that the oil return hole is always in the oil.

  In the technique described in Patent Document 3, since the oil return hole is immersed in the oil in the first oil chamber, the blow-by gas blow-out phenomenon from the oil return hole is reliably prevented, and the oil The blow-back phenomenon is prevented.

Japanese Utility Model Publication No. 62-721 Japanese Utility Model Publication No. 62-21417 Japanese Utility Model Publication No. 2-127721

  By the way, as an example of a typical structure of the oil separator provided in the head cover of the cylinder head, the one shown in FIG. 3 can be exemplified.

  With reference to FIG. 3, in this oil separator, a separator chamber 108 communicating with the inlet 106 is defined between both the head cover 102 and the baffle plate 104 of the cylinder head 100. An oil pool 110 is formed in the baffle plate 104 so as to face the opening of the separator chamber 108. The oil pool 110 is formed by recessing the baffle plate 104 downward in a cylindrical shape. The baffle plate 104 is provided with a baffle plate 112 that protrudes into the separator chamber 108 at a position spaced from the oil pool 110 toward the inlet 106 and forms a gap with the upper wall of the head cover 102. . An oil dropping hole 114 is defined at the lowermost portion of the oil pool 110.

  That is, the oil separator described above applies the blow-by gas that has flowed into the separator chamber 108 from the crankcase (not shown) into the separator chamber 108 to the baffle plate 112 in the separator chamber 108 to thereby remove the oil mixed in the blow-by gas. The oil dropped on the pool 110 is returned to the cylinder head 100 through the oil dropping hole 114 of the oil pool 110.

  However, in the case of the above oil separator, when the PCV (Positive Crankcase Ventilation) flow rate increases, the blow-by gas is sucked not only from the vicinity of the inlet 106 (A part) but also from the oil dropping hole 114 (B part), and the oil pool 110 The oil collected in the air was blown back and the oil removal was getting worse. In other words, the oil accumulated in the oil pool 110 is blown back and taken away into the separator chamber 108, which worsens the oil removal. Further, the oil removal is also deteriorated by the oil mist flowing from the oil dropping hole 114 having a pressure adjusting function.

  This is because the oil mist in the blow-by gas sucked up is collected by the baffle plate 112, and the oil needs to be dropped into the cylinder head 100, but when the separator chamber 108 has a certain negative pressure or less depending on the operating conditions, Blowback occurs. At that time, the blow-back is statically prevented by the oil oil level in the oil pool 110, but as shown in FIG. This is because the oil is removed again by blowing back from the cam chamber 116.

  The present invention has been made in view of the above technical problem, and an object of the present invention is to provide an oil separator capable of preventing oil removal due to blow-back from the cam chamber.

  In order to achieve the above object, an oil separator according to the present invention has a baffle plate in which a separator chamber communicating with an inflow port is defined between both a head cover of a cylinder head and a baffle plate, and faces the opening of the separator chamber. The first baffle plate is erected so as to protrude into the separator chamber at a position spaced from the oil pool to the outlet side and to form a gap with the upper wall of the head cover. The blow-by gas that has flowed into the separator chamber from the crankcase is applied to the first baffle plate in the separator chamber, so that the oil mixed in the blow-by gas is dripped into the oil pool, and the dripped oil is dropped at the bottom of the oil pool. The oil seal is designed to be returned to the cylinder head through the oil drop hole divided into The baffle plate is formed with a pressure adjusting hole for adjusting the pressure inside the separator chamber on the opposite side of the inlet from the oil dropping hole of the oil pool. The separator chamber and the cam chamber are connected to each other through a hole.

  The blow-by gas that has flowed into the separator chamber through the inlet from the crankcase hits the first baffle plate in the separator chamber, and the oil mixed in the blow-by gas is dripped into the oil pool. It returns to the cylinder head through the oil pit.

  By the way, in the conventional oil separator, when the PCV flow rate is increased, the blow-by gas is sucked up not only from the vicinity of the inlet but also from the oil dropping hole, and the oil collected in the oil pool is blown back from the cam chamber and the oil removal is deteriorated. .

  On the other hand, in the present invention, the baffle plate is formed with a pressure adjusting hole on the opposite side of the inlet with the oil dropping hole of the oil pool interposed therebetween, thereby separating the oil dropping hole and the pressure adjusting hole. The separator chamber and the cam chamber are connected to each other through a pressure regulating hole separated from the oil dropping hole, so that the pressure inside the separator chamber is regulated, and the separator chamber becomes negative pressure so that the oil pool blows back. Never become. As a result, oil removal due to blow-back from the cam chamber can be prevented.

  As described above, since the oil dropping hole and the pressure adjusting hole are separated in the baffle plate and the separator chamber does not become so negative that the blowback from the oil pool occurs, the blow-by gas generated in the cam chamber It will flow into the separator chamber from the hole. For this reason, it is necessary to drop the oil mixed in the blow-by gas from the cam chamber flowing into the separator chamber from the pressure adjusting chamber into the oil pool by means different from the first baffle plate.

  Therefore, in the oil separator, a second baffle is arranged between the oil pool and the pressure adjusting hole so that a part thereof is located above the oil pool in the separator chamber. The second baffle plate is suspended from the upper wall of the head cover so as to form a gap with the baffle plate.

  The second baffle is disposed between the oil pool and the pressure adjusting hole so that a part of the second baffle is located above the oil pool in the separator chamber, and a head cover is formed so as to form a gap with the baffle plate. The blow-by gas generated in the cam chamber is sucked up into the separator chamber from the pressure adjusting hole and drained by the second baffle, and the oil falls to the all pool. .

  According to the present invention, it is possible to provide an oil separator capable of preventing oil removal due to blow-back from the cam chamber.

It is a figure which shows the structure of the oil separator concerning embodiment of this invention, Comprising: (A) is a top view, (B) is sectional drawing which follows the XX line of (A). It is a figure which expands and shows the Y section of FIG.1 (B). It is sectional drawing which shows the structure of the conventional oil separator. It is a figure which expands and shows the Z section of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  1A and 1B are diagrams showing a configuration of an oil separator according to an embodiment of the present invention, in which FIG. 1A is a plan view, and FIG. 1B is a cross section taken along line XX of FIG. 1A. FIG. FIG. 2 is an enlarged view showing a Y portion in FIG.

  1 and 2, the oil separator according to the present embodiment has a baffle plate 14 attached to a head cover 12 of a cylinder head 10, and a separator communicated with an inflow port 16 therebetween. A chamber 18 is defined.

  A plurality (four in this embodiment) of ignition coil mounting holes 20 are provided in the longitudinal direction of the head cover 12 in the region opposite to the inlet 16 on the upper wall of the head cover 12 (the right region in FIG. 1A). Are formed along.

  The separator chamber 18 is a chamber for separating oil contained in the blow-by gas, and the oil pool 22 is formed by recessing the baffle plate 14 in a cylindrical shape downward so as to face the opening of the separator chamber 18. Is formed.

  The oil pool 22 is a recess for storing the oil separated in the separator chamber 18, and an oil dropping hole 24 is defined at the lowermost portion thereof.

  A first baffle plate 26 is disposed at a position spaced from the oil pool 22 toward the inlet 16. The first baffle plate 26 is erected from the baffle plate 14 so as to protrude into the separator chamber 18 and form a gap with the upper wall of the head cover 12. The planar shape of the first baffle plate 26 is substantially L-shaped so that blow-by gas flowing in from the inflow port 16 detours to the oil pool 22 side.

  On the downstream side of the gas flow path of the first baffle plate 26, a baffle plate group 28 composed of a plurality of (four in this embodiment) baffle plates along the longitudinal direction of the head cover 12 is arranged. The blow-by gas flows out from the outlet 30 while meandering by passing through the baffle group 28. A PCV valve (not shown) is attached to the outlet 30.

  A pressure adjusting hole 32 is formed in the baffle plate 14 on the side opposite to the inlet 16 with the oil dropping hole 24 of the oil pool 22 interposed therebetween. The pressure adjusting hole 32 is a hole for adjusting the pressure in the separator chamber 18, and the separator chamber 18 and the cam chamber 34 are connected to each other through the pressure adjusting hole 32.

  Further, in the present oil separator, a second baffle plate 36 is disposed between the oil pool 22 and the pressure adjusting hole 32 so that a part thereof is positioned above the oil pool 22 in the separator chamber 18. Yes. The second baffle plate 36 is suspended from the upper wall of the head cover 12 so as to form a gap with the baffle plate 14. The planar shape of the second baffle plate 36 is an arc shape so that blow-by gas flowing from the pressure adjusting hole 32 can easily hit.

  In the above configuration, as shown in FIG. 1B, the blow-by gas that has flowed into the separator chamber 18 from the crankcase (not shown) through the inlet 16 hits the first baffle plate 26 in the separator chamber 18 and is blown into the blow-by gas. The oil mixed in is dropped into the oil pool 22, and the dropped oil is returned into the cylinder head 10 through the oil dropping hole 24 of the oil pool 22.

  When the PCV flow rate increases, there is a concern that the blow-by gas is sucked not only from the vicinity of the inlet 16 but also from the oil dropping hole 24, and the oil collected in the oil pool 22 is blown back from the cam chamber 34, so that the oil removal is deteriorated. In the present embodiment, a pressure adjusting hole 32 is formed on the baffle plate 14 on the opposite side of the inlet 16 with the oil dropping hole 24 of the oil pool 22 interposed therebetween, whereby the oil dropping hole 24 and the pressure adjusting hole 32 are formed. Since the separator chamber 18 and the cam chamber 34 are connected to each other through the pressure regulating hole 32 separated from the oil drop hole 24, the chamber pressure in the separator chamber 18 is regulated, and the oil pool The separator chamber 18 does not become so negative that the air blows back from 22. As a result, oil removal due to blow-back from the cam chamber 34 can be prevented.

  Further, as described above, the oil dropping hole 24 and the pressure adjusting hole 32 are separated from each other in the baffle plate 14, and the separator chamber 18 does not become so negative that the oil pool 22 blows back. The generated blow-by gas flows into the separator chamber from the pressure adjusting hole 32, but in the present embodiment, the second baffle plate 36 is placed between the oil pool 22 and the pressure adjusting hole 32 in the separator chamber 18. As shown in FIG. 2, it is arranged so that a part thereof is positioned above the oil pool 22 and hangs down from the upper wall of the head cover 12 so as to form a gap with the baffle plate 14. In addition, the blow-by gas generated in the cam chamber 34 is sucked into the separator chamber 18 from the pressure adjusting hole 32, and the oil is cut out by the second baffle plate 36. , The oil would fall to the oil pool 22.

  The present invention is not limited to the above embodiment.

  For example, in the above-described embodiment, an example in which the planar shape of the second baffle is an arc shape has been described. However, the present invention is not limited to such a configuration. The second baffle plate may have any shape as long as it is easily hit by blow-by gas, such as a flat plate shape and a semicircular shape.

  In addition, it goes without saying that various design changes and modifications can be made within the scope of the claims attached to this specification.

DESCRIPTION OF SYMBOLS 10 Cylinder head 12 Head cover 14 Baffle plate 16 Inlet 18 Separator chamber 22 Oil pool 24 Oil drop hole 26 1st baffle plate 32 Pressure regulation hole 34 2nd baffle plate

Claims (2)

A separator chamber communicating with the inlet is defined between both the head cover and the baffle plate of the cylinder head,
An oil pool is formed by indenting the baffle plate downward so as to face the opening of the separator chamber,
A first baffle that protrudes into the separator chamber at a position spaced from the oil pool to the outlet side and that forms a gap with the upper wall of the head cover;
The blow-by gas that has flowed into the separator chamber from the crankcase is applied to the first baffle plate in the separator chamber so that the oil mixed in the blow-by gas is dripped into the oil pool, and the dripped oil is placed at the bottom of the oil pool. An oil separator adapted to return into the cylinder head through a defined oil drop hole;
The baffle plate is formed with a pressure adjusting hole for adjusting the indoor pressure of the separator chamber on the side opposite to the inflow port across the oil dropping hole of the oil pool, and the pressure adjusting hole is used to adjust the pressure through the pressure adjusting hole. An oil separator, wherein the separator chamber and the cam chamber are connected in communication. The oil separator according to claim 1,
Between the oil pool and the pressure adjusting hole, a second baffle plate is disposed so that a part thereof is located above the oil pool in the separator chamber,
The second baffle plate is suspended from the upper wall of the head cover so as to form a gap between the second baffle plate and the baffle plate.

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