JP2014173542A - Oil separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a baffle plate type oil separator which has a simple structure and can secure the sealing of a separator chamber.SOLUTION: In an oil separator 10 which constitutes a separator chamber 20 by forming a separator upper part 11a on the inner surface of a ceiling wall 1a of a cylinder head cover 1 and by connecting a separator lower part 11b separately formed on the separator upper part, a rib frame 14 is vertically disposed on a connection surface opposite to the separator lower part, of the separator upper part, a connection part of the separator lower part is stored within the rib frame and a connection surface of the connection part of the separator lower part is abutted and connected onto the connection surface of the separator upper part.

Description

  The present invention relates to an oil separator, and more particularly to a baffle plate type oil separator.

  For example, in an automobile engine, blow-by gas that has flowed into a crankcase is guided to a cylinder head cover, and is returned to the intake pipe from the cylinder head cover.

  By the way, since oil is mixed in the blow-by gas, an oil separator is interposed in the blow-by gas recirculation system, the oil is removed by the oil separator, and the blow-by gas is recirculated to the intake pipe.

  As such an oil separator, as shown in FIGS. 6 and 7, a separator chamber 111 is formed in the cylinder head cover 100, a plurality of baffle plates 112 are arranged in the chamber, and are introduced from a gas inlet 113. In addition, there is a baffle plate type oil separator 110 that separates oil by colliding blow-by gas passing through the separator chamber 111 against the baffle plate 112 and returns the blow-by gas from a gas outlet 114 to an intake pipe (not shown).

  In such a baffle plate type oil separator 110, a peripheral wall 115 is erected on the inner surface of the ceiling wall 100a of the cylinder head cover 100, and a baffle plate 112 is erected in the peripheral wall to constitute the separator upper portion 110a, and a gasket 116 on the upper surface. Are separately configured, and the separator lower portion 110b is put on the opening end of the peripheral wall 115 of the separator upper portion 110a, and the separator lower portion 110b is fastened to the separator upper portion 110a with a screw 117. A chamber 111 is defined.

  However, in such an oil separator 110, the gasket 116 seals the lower end surface of the peripheral wall 115 of the separator upper portion 110a and the separator lower portion 110b. However, when the separator lower portion 110b is deformed such as warping, the separator There is a possibility that the sealing of the chamber 111 is impaired.

  In view of such circumstances, an object of the present invention is to provide a baffle plate type oil separator that can ensure the sealing of a separator chamber with a simple structure.

  In order to achieve the above object, an oil separator according to claim 1 comprises a separator upper portion formed on an inner surface of a ceiling wall of a cylinder head cover, and a separator lower portion formed separately on the upper portion of the separator to form a separator chamber. A rib frame is erected on the connecting surface of the upper portion of the separator facing the lower portion of the separator, the connecting portion of the lower portion of the separator is accommodated in the rib frame, and the connecting surface is brought into contact with the connecting surface of the upper portion of the separator. Are connected.

  According to a second aspect of the present invention, there is provided the oil separator according to the first aspect, wherein a peripheral wall is erected on the inner surface of the ceiling wall of the cylinder head cover, and a blowby gas inlet is formed at one end of the peripheral wall. A plurality of baffle plates are erected to form the upper part of the separator, and the rib frame is erected at the contact portion of the peripheral wall with the separator lower part, and the plate-like separator lower part is accommodated in the rib frame. The connecting surface is brought into contact with the connecting surface of the upper part of the separator to be connected.

  According to a third aspect of the present invention, in the invention of the first aspect, the rib frame is erected on the inner surface of the ceiling wall of the cylinder head cover to constitute the upper part of the separator, and the peripheral wall is erected on the periphery of the bottom wall. A plurality of baffle plates are erected on the inner surface of the bottom wall, a blow-by gas introduction port is formed on the peripheral side wall of one end of the peripheral wall, and a flange is formed outwardly on the peripheral edge of the connecting portion of the peripheral wall. Forming a lower part of the separator, housing a flange of the lower part of the separator in a rib frame of the upper part of the separator, and connecting the connecting surface of the lower part of the separator by contacting the inner surface of the ceiling wall of the cylinder head cover. .

  Furthermore, an oil separator according to a fourth aspect is the invention according to the third aspect, wherein a part of the rib frame at the upper part of the separator is protruded inward so as to be formed between the connecting surface and the oil separator. The flange at the lower part of the separator is accommodated in the space to be formed.

According to the oil separator according to the present invention of claim 1 described above, by connecting the lower part of the separator to the upper part of the separator so as to fit the upper end of the lower part of the separator in the rib frame erected on the upper part of the separator, Since the labyrinth seal is formed in the joint part, the sealability of the separator chamber can be secured even if some deformation occurs in the upper part or lower part of the separator, and the gasket interposed between them can be omitted. It becomes possible.
In particular, in an engine that is mounted on the vehicle body so that the axis of the cylinder is substantially horizontal and covers the cylinder head cover from the side, the connecting surface of the upper part of the separator and the lower part of the separator is raised vertically, In this case, the rib frame formed on the upper part of the separator serves as an eaves and can effectively prevent the oil dripping from above from entering the gap between the upper part of the separator and the lower part of the separator. It appears prominently.

  The oil separator according to the second aspect of the present invention is an embodiment of the present invention, wherein a main component such as a baffle plate is integrally formed on the upper portion of the separator, and the lower portion of the plate-like separator is covered on the upper portion of the separator. This is effective for the lower part of the plate-like separator that is likely to be deformed such as warping.

  In another embodiment of the present invention, the oil separator according to claim 3 described above is formed by integrally forming a main component such as a baffle plate in the lower part of the separator, and ribs the lower part of the separator on the inner surface of the cylinder head cover. Since the frame is assembled to the upper part of the separator, the sealing of the separator chamber can be secured, and since positioning can be performed when the lower part of the separator is assembled to the upper part of the separator, the assembly is facilitated.

  Further, the oil separator according to the present invention of claim 4 is a modification of the rib frame according to the invention of claim 3, and when the lower part of the separator is assembled to the upper part of the separator, the flange of the lower part of the separator is attached to the upper part of the separator. By inserting into the gap formed by the tongue piece protruding inward from the rib frame and the inner surface of the cylinder head cover, not only positioning of the lower part of the separator can be achieved, but also lifting of part of the lower part of the separator can be prevented. The number of screw fastening points can also be reduced.

1 is a conceptual exploded perspective view showing an embodiment of an oil separator according to the present invention, showing a cylinder head cover in which an upper part of the separator is configured, and a lower part of the separator attached to the upper part of the separator. It is a longitudinal cross-sectional view of the state which assembled | attached the separator lower part shown in FIG. 1 on the separator upper part, and formed the oil separator. FIG. 5 is a conceptual exploded perspective view showing another embodiment of an oil separator according to the present invention, showing a cylinder head cover in which the upper part of the separator is configured and a lower part of the separator attached to the upper part of the separator. It is a longitudinal cross-sectional view of the state which assembled | attached the separator lower part shown in FIG. 3 on the separator upper part, and formed the oil separator. It is the elements on larger scale which showed the modification of the rib frame in other embodiment shown in FIG. 3 and FIG. FIG. 10 is a conceptual exploded perspective view showing a conventional oil separator, showing a cylinder head cover in which the upper part of the separator is configured and a lower part of the separator attached to the upper part of the separator. It is a longitudinal cross-sectional view of the state which assembled | attached the separator lower part shown in FIG. 6 on the separator upper part, and formed the oil separator.

  Hereinafter, an oil separator according to the present invention will be described in detail based on the embodiments shown in the drawings.

  As shown in FIG. 1, the oil separator 10 includes a separator upper portion 11a formed on an engine aluminum or synthetic resin cylinder head cover 1, and a synthetic resin separator lower portion 11b attached to the cover. .

  The separator upper portion 11a includes a peripheral wall 12 standing on the inner surface of the ceiling wall 1a of the cylinder head cover 1, and baffle plates 13a, 13b, and 13c standing on the inner wall area thereof.

A rib frame 14 is erected on the outer edge of the lower end surface of the peripheral wall 12, and a blow-by gas inlet 15 is formed in one end wall 12 a of the peripheral wall 12.
The baffle plates 13a and 13c are extended from one side wall 12b of the peripheral wall 12 toward the other side wall 12d facing each other, and a slight gap is secured between the tip and the other side wall 12d. Further, the baffle plate 13b extends from the other side wall 12d of the peripheral wall 12 toward the opposing one side wall 12b, and a slight gap is secured between the front end and the one side wall 12b.
A boss 17 for screwing a screw 16 is attached to each corner of the peripheral wall 12, and a gas outlet port is provided on the ceiling wall 1a between the other end wall 12c of the peripheral wall 12 and the baffle plate 13c. 18 is formed.

  On the other hand, the separator lower portion 11b is formed by a plate body 19 having a gasket 19a (the gasket 19a may be omitted) on the inner surface, and has a screw insertion hole 19b at a corner.

In this oil separator 10, the plate body 19 is accommodated in the rib frame 14 of the separator upper portion 11a, and the screw 16 inserted through the screw insertion hole 19b is fastened to the boss 17, thereby coupling the separator lower portion 11b to the separator upper portion 11a. Let
As shown in FIG. 2, the oil separator 10 assembled in this way is sealed between the plate body 19 and the peripheral wall 12, thereby defining a separator chamber 20.

  In this oil separator 10, the blow-by gas in the cylinder head cover 1 is introduced into the separator chamber 20 from the gas inlet 15 and passes through the gas passage 20a formed by the baffle plates 13a, 13b, 13c and the peripheral wall 12, and the baffle plate 13a. , 13b, and 13c, oil is separated and fed from the gas outlet port 18 to an intake pipe (not shown).

  According to the oil separator 10, a labyrinth seal is formed by the lower end portion of the peripheral wall 12 and the peripheral edge of the plate body 19, so that not only the hermeticity is improved but also the deformation of the plate body 19 is suppressed, and the plate Even if the body 19 is deformed, the hermeticity is maintained. Further, since the plate body 19 is positioned by the rib frame 14, the fastening work is facilitated, and the assembly work time can be shortened.

  In particular, in an engine that is mounted on the vehicle body so that the axis of the cylinder is substantially horizontal and covers the cylinder head cover 1 from the side, as shown in FIG. 2, the separator upper portion 11a and the separator lower portion 11b are connected to each other. In this case, the rib frame 14 formed on the separator upper portion 11a acts as an eave, and the oil dripping from above is effective to enter the gap between the separator upper portion and the separator lower portion. Therefore, the sealing effect is more prominent.

3 and 4 show another embodiment of the oil separator according to the present invention.
The oil separator 30 includes a separator upper portion 31a formed on the cylinder head cover 1 made of aluminum or synthetic resin of the engine, and a synthetic resin separator lower portion 31b attached to the cover.

The separator upper portion 31 a is formed at a rib frame 32 erected on the inner surface of the ceiling wall 1 a of the cylinder head cover 1, a boss 33 erected at the center of the rib frame 32, and a corner in the rib frame 32. A gas outlet port 34 is provided.
The rib frame 32 accommodates the separator lower part 31b, and the boss 33 is for attaching the separator lower part 31b. The gas outlet port 34 is for leading the blow-by gas in the oil separator 30 to the outside.

  On the other hand, the separator lower part 31b is formed with a box opened to one side by a bottom wall 35 and a peripheral wall 36 standing on the periphery of the bottom wall. A flange 37 is formed on the periphery of the opening of the peripheral wall 36 toward the outside. Further, notches are formed in the side walls 36a, 36b and the bottom wall 35 adjacent to each other on the peripheral wall 36, and a gas introduction port 38 for introducing blow-by gas into the separator chamber is formed by the notches. Further, on the bottom wall 35, baffle plates 39a and 39c are erected on the opposite side wall from one side wall 36b toward the side wall 36d with a slight distance from the side wall 36d, and between the baffle plates 39a and 39c, the side wall A baffle plate 39b is erected from 36d toward the side wall 36b with a slight gap from the side wall 36b. Further, a screw insertion hole 35a for attaching the separator lower part 31b to the separator upper part 31a is formed in the center part of the bottom wall 35.

In this oil separator 30, the flange 37 of the separator lower part 31b is accommodated in the rib frame 32 of the separator upper part 31a, and the screw 40 inserted through the screw insertion hole 35a is fastened to the boss 33, whereby the separator lower part 31b is attached to the separator upper part. Combine with 31a.
As shown in FIG. 4, the oil separator 30 assembled in this way is sealed between the separator lower part 31 b and the separator upper part 31 a, thereby defining a separator chamber 42.

  In the oil separator 30 configured as described above, the blow-by gas in the cylinder head cover 1 is introduced into the separator chamber 42 from the gas introduction port 38 and passes through the gas passage 42a formed by the baffle plates 39a, 39b, 39c and the peripheral wall 36. Then, the oil is separated by contacting the baffle plates 39a, 39b, and 39c, and is supplied from the gas outlet port 34 to an intake pipe (not shown).

  According to this oil separator 30, since the labyrinth seal is formed by the flange 37 and the rib frame 32 at the lower end portion of the peripheral wall 36, not only the sealing performance is improved, but also the deformation of the separator lower part 31b is suppressed, and Even if the separator lower part 31b is deformed, the hermeticity is maintained. In addition, since the separator lower part 31b is positioned by the rib frame 32, the fastening operation is facilitated, and the number of fastening portions is small. For example, the number of the fastening portions may be one as in the embodiment.

  In particular, as shown in FIG. 4, in an engine in which the connecting surface between the separator upper part 31 a and the separator lower part 31 b is raised in the vertical direction, the rib frame 32 formed on the separator upper part 31 a functions as an eave, It is possible to effectively prevent the sagging oil from entering the gap between the separator upper part 31a and the separator lower part 31b, so that the sealing effect is more prominent and a gasket is not necessary.

  FIG. 5 shows a modification of the rib frame 32 in the oil separator 30. In this modified example, a tongue piece 32a is protruded with the front end of a part of the rib frame 32 facing inward. Thus, a space for accommodating the flange 37 of the separator lower part 31b is formed between the tongue piece 32a and the inner surface of the ceiling wall 1a.

  According to this modification, when assembling the separator lower part 31b to the separator upper part 31a, a part of the flange 37 of the separator lower part 31b is inserted between the tongue piece 32a and the inner surface of the ceiling wall 1a. One end of 31b can be restrained without using a screw or the like. Therefore, the separator lower part 31b can be fixed to the separator upper part 32a only by fastening the other end part of the separator lower part 31b with a screw or the like.

  Although various embodiments of the oil separator according to the present invention have been described above, the present invention is not limited to the above-described embodiments, and the technical idea of the present invention described in the claims is not limited thereto. Of course, it is possible to make the embodiment further various changes within the scope.

DESCRIPTION OF SYMBOLS 1 Cylinder head cover 1a Ceiling wall 10 Oil separator 11a Separator upper part 11b Separator lower part 12 Peripheral wall 12a, 12c End wall 12b, 12d Side wall 13a-13c Baffle plate 14 Rib frame 15 Gas inlet 16 Screw 17 Boss 18 Gas lead-out port 19 Plate 19a Gasket 20 Separator chamber 30 Oil separator 31a Separator upper part 31b Separator lower part 32 Rib frame 32a Tongue piece 33 Boss 34 Gas outlet port 35 Bottom wall 36 Perimeter wall 37 Flange 38 Gas inlet port 39a-39c Baffle plate 40 Screw

Claims (4)

  In an oil separator that forms a separator chamber by forming a separator upper portion on the ceiling wall inner surface of a cylinder head cover and connecting a separator lower portion separately formed on the separator upper portion, a rib is formed on a connecting surface of the separator upper portion that faces the separator lower portion. An oil separator, characterized in that a frame is erected, a coupling portion at the lower part of the separator is accommodated in the rib frame, and a coupling surface thereof is brought into contact with a coupling surface at the upper part of the separator.   A peripheral wall is erected on the inner surface of the ceiling wall of the cylinder head cover, a blow-by gas introduction port is formed at one end of the peripheral wall, and a plurality of baffle plates are erected in the peripheral wall to constitute an upper portion of the separator. The rib frame is erected at a contact portion with the separator lower portion, the plate-like separator lower portion is accommodated in the rib frame, and the connection surface is brought into contact with the connection surface of the separator upper portion to be connected. The oil separator according to claim 1, wherein the oil separator is characterized.   The rib frame is erected on the inner surface of the ceiling wall of the cylinder head cover to constitute the upper part of the separator, the peripheral wall is erected on the periphery of the bottom wall, and a plurality of baffle plates are erected on the inner surface of the bottom wall, and one end of the peripheral wall A blow-by gas inlet is formed on the peripheral side wall of the part, and a flange is formed outwardly on the peripheral edge of the connecting part of the peripheral wall to constitute a lower part of the separator. 2. The oil separator according to claim 1, wherein a connecting surface of the lower part of the separator is brought into contact with an inner surface of a ceiling wall of the cylinder head cover and connected.   The rib frame at the upper part of the separator protrudes inward from a part of the rib frame so that the flange at the lower part of the separator is accommodated in a space formed between the ribs. The oil separator according to claim 3.

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