JPS6315450B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an oil separation device for blow-by gas that removes oil mixed in blow-by gas.

[Prior art]

This type of oil separator is installed in an air passage communicating with the crank chamber of an internal combustion engine. Conventionally, this oil separator was installed in a camshaft installed in the air passage. Are known.

This oil separation device consists of a sprocket installed on the camshaft and a blow-by gas discharge port opened close to the side of the sprocket. It is designed to be delivered from the discharge port through a gap formed between the periphery of the opening and the periphery of the opening. When the blow-by gas passes through this gap, the oil contained in this gas is separated and removed.

In other words, when the blow-by gas passes through the gap, highly viscous oil adheres to the side surfaces of the sprocket, and this adhered oil is shaken off by the centrifugal force exerted by the rotation of the sprocket, and the air passage walls, etc. It is then returned to the crank chamber. Therefore, in order to improve the ability to separate oil from blow-by gas, it is necessary to make the gap as narrow as possible so that oil can easily adhere to the sprocket.

By the way, since a cam chain that transmits the rotational force of the crankshaft to the camshaft is wound around the sprocket, this cam chain gets in the way and makes it impossible to move the sprocket sufficiently close to the discharge port. arise.

For this reason, for example, "Jikko 36-
24954, a rotating disk is provided at the end of the camshaft at a position closer to the discharge port than the sprocket, and the discharge port is provided with a discharge port member that protrudes toward the rotating disk, It is conceivable to form a gap between these rotating disks and the discharge port member. According to this configuration, oil separation is performed in the gap between the rotating disk and the discharge port member, so this gap can be made narrow without being obstructed by the cam chain, and the oil separation function can be improved. can be increased.

[Problem that the invention seeks to solve]

However, in the case of the above configuration, the oil that is shaken off by the rotation of the rotating disk scatters into the air passage, travels along the wall of this air passage, and is returned to the crank chamber side. Oil sometimes flowed into the gap through the circumferential surface of the discharge port member.

For this reason, the oil that has been separated is taken advantage of by the flow of blow-by gas and guided into the discharge port.
There is a problem in that the centrifugal separation effect accompanying the rotation of the rotating disk cannot be effectively utilized.

Therefore, the present invention provides an oil separation device for blow-by gas that not only can reliably separate oil but also prevents the separated oil from flowing into the discharge port and has an excellent oil separation function. The purpose is to provide.

[Means for solving problems]

Therefore, in the present invention, one end of the rotating shaft is introduced into the air passage that guides the blow-by gas generated in the crank chamber of the internal combustion engine, and a rotating force transmitting member is provided at one end of the rotating shaft. A blow-by gas oil separator is provided, in which a rotating disk that rotates together with the rotating shaft is provided adjacent to the rotary disk, and a blow-by gas discharge port is provided opposite to the side surface of the rotating disk. A cylindrical discharge port protruding toward the disk side is provided, and a flange portion is provided at the tip of the discharge port body in close opposition to the rotating disk to form a gap for oil separation with the rotating disk. It is characterized by having been established.

[Effect]

According to this configuration, during operation of the internal combustion engine, blow-by gas generated in the crank chamber travels through the air passage and flows into the gap between the rotating disk and the discharge port member. When the blow-by gas passes through this gap, highly viscous oil adheres to the side surfaces of the rotating disk and flange, and this adhered oil is subjected to centrifugal force exerted by the rotation of the rotating disk, causing the air passage I am shaken off inside.

Most of the oil shaken off by the rotation of the rotary disk adheres to the wall surface of the air passage, and is returned to the crank chamber through this wall surface. At this time, since the opening of the discharge port is provided with a discharge port body that protrudes toward the rotating disk, the oil that has flowed along the wall surface of the air passage to the discharge port is removed from this cylindrical portion. is guided below the discharge port.
Moreover, since the tip of this discharge port body is formed with a flange portion that faces the rotating disk, the oil traveling along the outer circumference of the discharge port body does not flow into the discharge port side, and instead flows directly below the discharge port. be guided. Therefore, the separated oil does not flow into the discharge port, and the oil removal effect is improved.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

Reference numeral 1 in the figure is a head of an internal combustion engine, and this head 1 is composed of a head cover 2 and a side cover 3. An air passage 4 is formed inside the head 1 and communicates with a crank chamber (not shown). The air passage 4 is communicated with an air cleaner (not shown) via an air cleaner connection pipe 5 provided at the upper part of the side cover 3, and the blow-by gas generated in the crank chamber is transferred to the air passage 4.
From there, the air is delivered to the air cleaner through an air cleaner connection pipe 5.

In FIG. 1, reference numeral 6 is a combustion chamber, and 7 is a cylinder head.

Inside the head 1 is a camshaft 8 as a rotating shaft.
is supported via a bearing 9, and one end of the camshaft 8 is led out into the air passage 4.

Note that reference numeral 10 is a fixing bolt that fixes the bearing 9 inside the head cover 2.

A sprocket 11 as a rotational force transmitting member is provided on one end surface of the camshaft 8, and the sprocket 11 is fixed to the camshaft 8 via a pin 12 and a mounting bolt 13. In addition, 14 is sprocket 11
This cam chain 14 transmits the rotation of a crankshaft (not shown) to the camshaft 8 via the sprocket 11.

Further, a rotary disk 15 is provided at one end of the camshaft 8 so as to be located closer to the side cover 3 than the sprocket 11. The rotating disk 15 is formed into a dish shape with a diameter larger than the diameter of the sprocket 11.
It has an insertion hole 29 in its center, and a curved portion 30 on its outer periphery. Such a rotating disk 15 is fastened together with the camshaft 8 in a state adjacent to the sprocket 11 by inserting the mounting bolt 13 into the insertion hole 29, and its warped portion 30 faces the cam chain 14 side. .

On the other hand, on the inner surface of the side cover 3, there is a rotating disk 1.
A discharge port member 16 is attached opposite to the discharge port member 5 . The discharge port member 16 includes a shielding plate 17 attached between the head cover 2 and the side cover 3,
A discharge port 18a that communicates the air passage 4 and the air cleaner connecting pipe 5 is provided in the center of the shielding plate 17.
is opened. Inside the discharge port 18a, there is a cylindrical discharge port body 18 that protrudes toward the rotating disk 15 side.
A flange portion 19 is formed at the protruding tip of the discharge port body 18 so as to extend outward in the radial direction and closely face the side surface of the rotating disk 15 . Therefore, the discharge port 18a is opened close to the side surface of the rotating disk 15, and a gap 24 is formed between the rotating disk 15 and the flange portion 19 through which the blow-by gas passes. has been done.

Note that a rubber material 23 is baked and fixed to the outer peripheral edge of the shielding plate 17, and this rubber material 23 is in liquid-tight contact with the inner surface of the side cover 3.

A gap 20 is also formed between the flange portion 19 and the shielding plate 17, and the shielding plate 17 has a pair of protrusions 2 having a cross-sectional shape shown in FIG.
1 is formed, and a protrusion through hole 22 is formed between these protrusions 21. On the inner surface of the side cover 3, a pair of retaining protrusions 25,
26 are provided protrudingly, and the tip of one protrusion 25 enters into the discharge port body 18 and attaches to the mounting bolt 13.
The other protrusion 26 passes through the protrusion through hole 22, and its tip faces the fixing bolt 10 at a distance.

Next, the operation of the embodiment having such a configuration will be explained.

First, during engine operation when the rotating disk 15 is rotating together with the camshaft 8, blow-by gas generated in the crank chamber will flow into the discharge port 18a through the gap 24 as shown by the arrow in FIG. Then, the oil in this blow-by gas adheres to the side surfaces of the rotating disk 15 and the flange portion 19 of the discharge port body 18 that form the gap 24 due to the viscosity of the oil itself. The attached oil is shaken off by the centrifugal force exerted by the rotation of the rotary disk 15 and removed from the blow-by gas.

According to this embodiment of the present invention, oil in the blow-by gas is separated in the gap 24 between the rotating disk 15 and the flange portion 19 of the discharge port body 18. 24 can be made narrower without being obstructed by the cam chain 14. Therefore, the oil contained in the blow-by gas is likely to adhere to the rotating disk 15 and the flange portion 19, and the oil can be reliably removed.

Further, the oil shaken off by the centrifugal action of the rotating disk 15 scatters into the air passage 4 and adheres to its wall surface and shielding plate 17.
7 and is returned to the crank chamber side. At this time, since a discharge port body 18 that protrudes toward the rotating disk 15 is provided in the discharge port 18a at the center of the shielding plate 17, the oil flowing through the shielding plate 17 is As shown by the arrow in FIG. 5, the air is transmitted along the outer circumferential surface of the outlet body 18, that is, bypasses around the outlet 18a and is guided below the outlet 18a.

Moreover, since a flange portion 19 extending radially outward is formed at the tip of the discharge port body 18, oil transmitted along the outer circumferential surface of the discharge port body 18 is absorbed into the gap 2.
4, and the discharge port 18 as it is.
It is guided below a.

Therefore, the oil that has been shaken off by the rotation of the rotary disk 15 does not flow into the discharge port 18a, and there is an advantage that the oil removal effect is improved compared to the conventional method.

Furthermore, in this embodiment, since a curved portion 30 facing the cam chain 14 side is formed on the outer peripheral edge of the rotating disk 15, which has a larger diameter than the sprocket 11, a portion of the oil in the blow-by gas is absorbed into the gap. 24
Since the oil is scattered to the cam chain 14 side before passing through, the oil removal function can be further enhanced.

Note that the present invention is not limited to the above embodiments. For example, the curved portion 30 of the outer peripheral edge of the rotating disk 15 does not necessarily have to face the cam chain 14 side, and the curved portion 30 of the rotating disk 27 shown in FIGS.
It may be formed toward the 6th side. In this case, if the curved portion 28 is extended toward the shielding plate 17 side from the flange portion 19 of the discharge port body 18, the oil scattered toward the shielding plate 17 side by the curved portion 28 before passing through the gap 24 will be It is guided toward the gap 20 between the shielding plate 17 and the flange portion 19.

Therefore, it is possible to more reliably prevent oil from flowing into the discharge port 18a, and there is an advantage that the oil can be efficiently recovered.

Further, the rotating disk 15 is not limited to a camshaft, and may be any rotating shaft that faces into an air passage communicating with the crank chamber.

〔Effect of the invention〕

According to the present invention described in detail above, it is possible to prevent the oil separated by the centrifugal action of the rotating disk from flowing into the discharge port, and there is an advantage that the oil removal effect is improved.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view of the entire device, FIG. 2 is a sectional view of the rotating disk, and FIG. 3 is a plan view of the rotating disk. Fourth
5 is a plan view of the discharge port member, FIG. 6 is a sectional view taken along the line - in FIG. 5, and FIGS. 7 to 9 are other embodiments of the present invention. FIG. 7 is a longitudinal sectional view of the entire device, FIG. 8 is a sectional view of the rotating disk, and FIG. 9 is a plan view of the rotating disk. 4... Air passage, 8... Rotating shaft (camshaft), 11... Rotational force transmission member (sprocket),
15...Rotating disk, 18...Discharge port body, 18a...
...Discharge port, 19...Flange portion, 24...Gap.

Claims (1)

[Claims] 1. One end of a rotating shaft is introduced into an air passage that guides blow-by gas generated in the crank chamber of an internal combustion engine, and a rotating force transmitting member is provided at one end of the rotating shaft, and this rotating force transmitting member In a blow-by gas oil separation device, a rotary disk that rotates integrally with a rotating shaft is provided adjacent to the rotary disk, and a blow-by gas discharge port is provided opposite to the side surface of the rotary disk. 1. An oil separation device for blow-by gas, characterized in that a cylindrical discharge port body projecting to the side is provided, and a flange portion that closely faces a rotating disk is formed at the tip of the discharge port body.