JPH108938A - Oil exhausting device for oil separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To forcedly discharge oil in an oil separator chamber to prevent the blowoff of the oil to an air intake system, by providing a gear, forming a gear pump on the direct lower part of an oil outlet part, for flowing out the oil, separated to be recovered from a blow-by gas in an oil separating chamber. SOLUTION: A blow-by gas G, generated in the crank chamber of a cylinder block, is flowed into an oil separating chamber 6 via a passage. An oil mist in the blow-by gas G is separated from the blow-by gas G by the contact with plural partitioning plates 8 and so on, to be turned into a liquid film stage to be flowed down to a bottom surface 6a; and oil 7 flowed down to the bottom surface 6a, is flowed to an oil outlet part 12. In this case, the engaging part of intercam gears 20 and 20, rotated by cam shafts 16 and 16, are positioned on the direct lower part of the oil outlet part 12, and the oil 7 from the oil outlet part 12 is dropped on the engaging part of the intercam gears 20 and 20, thereby forcedly discharging the oil 7 to the cam chamber 14 side along respective inner wall surfaces 22 and 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil separator for separating and recovering oil in blow-by gas of an internal combustion engine, and more particularly to a structure of an oil separator for discharging oil accumulated in an oil separation chamber. .

[0002]

2. Description of the Related Art When returning blow-by gas of an internal combustion engine to an intake system, an oil separate chamber for collecting oil mist in the blow-by gas is often installed in a cylinder head cover. The oil mist formed into a liquid film in the oil separate chamber travels along the interior wall and accumulates at the bottom of the oil separate chamber. Various proposals have been made for discharging the oil mist to the cam chamber. For example, Japanese Utility Model Laid-Open Publication No. 3-23610 discloses a technique in which an impeller is provided below an oil separation chamber to forcibly discharge oil.

[0003]

However, the structure disclosed in the above-mentioned publication requires parts such as an impeller for exclusive use of oil discharge, resulting in an increase in cost. There is also a structure in which the oil is discharged only under conditions where the accumulated head pressure (gravity) of the oil is higher than the differential pressure between the cam chamber and the separate chamber. However, this condition is satisfied when the engine is stopped or When the vehicle is running at a constant speed for a long time, a large amount of oil is accumulated and the oil is blown out to the intake system. An object of the present invention is to provide an oil discharge device for an oil separator that can forcibly discharge oil from an oil separation chamber without adding a new part.

[0004]

The oil discharging device of the oil separator according to the present invention which achieves the above object is as follows. (1) An oil separation chamber, an oil outlet portion from which oil separated and recovered from the blow-by gas flows out in the oil separation chamber, and an existing oil outlet portion provided immediately below the oil outlet portion to form a gear pump. A gear and an oil separator for an oil separator. (2) The oil discharge device for an oil separator according to (1), wherein the gear is any one of a DOHC inter-cam gear, a distributor drive gear, and a vacuum pump drive gear.

[0005] In the oil discharge device for the oil separator of the above (1), the oil separated and collected from the blow-by gas in the oil separate chamber flows out from the oil outlet. An existing gear provided to form a gear pump is located directly below the oil outlet, so that oil from the oil outlet can be forcibly discharged to the cam chamber side by rotation of the gear Becomes In the oil discharge device for the oil separator of the above (2), the gear is any one of a DOHC inter-cam drive gear, a distributor drive gear, and a vacuum pump drive gear. No new gear is required.

[0006]

1 and 2 show an oil separator for an oil separator according to an embodiment of the present invention. In FIG. 1, reference numeral 2 denotes a cylinder head of an internal combustion engine (DOHC engine). Cylinder head 2
A cylinder head cover 4 is attached to the upper surface of the cylinder head. An oil separate chamber 6 is formed in the cylinder head cover 4. The blow-by gas G flows into the oil separate chamber 6 through a passage provided in a cylinder block and a cylinder head (not shown) or a passage provided outside the engine. Oil separate room 6
Is provided with a plurality of partition plates 8 for separating and collecting oil mist in the blow-by gas G. The partition plate 8 extends in the up-down direction. The blow-by gas G flowing into the oil separate chamber 6 is discharged from the exhaust port 10 of the oil separate chamber 6 to the intake system of the engine after the oil mist is removed. An oil outlet 12 is provided below the oil separate chamber 6 to allow the oil 7 separated from the blow-by gas G to flow out and return to the cam chamber 14.

Two camshafts 16 are arranged in the cam chamber 14 covered by the cylinder head cover 4.
Each camshaft 16 is rotatably supported on the upper end side of the cylinder head 2. A rotational driving force of a crankshaft (not shown) is transmitted to one camshaft 16 via a timing belt, a roller chain, or the like. Below the oil separate chamber 6, two gears 20 between the cams are provided.
Is arranged. Each inter-cam gear 20 is provided on each camshaft 16. Gear between two cams 2
0 are meshed with each other. The rotational driving force of one camshaft 16 is transmitted to the other camshaft 16 via the inter-cam gear 20.

A cam-to-cam gear 20, which is an existing gear provided to form a gear pump, is disposed immediately below the oil outlet 12. Further, specifically, a meshing portion of the inter-cam gear 20 is located immediately below the oil outlet portion 12. As shown by the arrow in FIG. 1, of the two inter-cam gears 20, the left gear 20 in the figure rotates counterclockwise, and the right gear 20 in the figure rotates clockwise. The cylinder head cover 4 is formed with arc-shaped inner wall surfaces 22 and 24 extending along the movement locus of the tooth tip of each inter-cam gear 20. Inner wall surface 22, 2
4 extends from the vicinity of the oil outlet 12 to the cam chamber 14 in the gear rotation direction. The gap b between the outer peripheral end of the one inter-cam gear 20 and the inner wall surface 22 is set as small as possible. Similarly, the outer peripheral end of the other inter-cam gear 20 and the inner wall surface 2
4 is set as small as possible. FIG.
As shown in FIG. 2, the cylinder head cover 4 has inner wall surfaces 26 and 28 facing the respective side surfaces 20a of the inter-cam gear 20. The inner wall surfaces 26 and 28 are connected to the oil outlet 12
, And extends to the cam chamber 14 in the gear rotation direction.
A gap a between one side surface 20a and the inner wall surface 26 and a gap a 'between the other side surface 20a and the inner wall surface 28 are set as small as possible.

As shown in FIGS. 1 and 2, the bottom surface 6a of the oil separating chamber 6 is formed as an inclined surface which is inclined downward, and the oil 7 collected by the partition plate 8 flows out through the bottom surface 6a. It is led to the unit 12. . Immediately above the oil outlet 12, there is provided a baffle plate 30 for preventing the oil flowing out of the oil outlet 12 from being flipped up by the rotation of the inter-cam gear 20 and being blown back to the oil separate chamber 6. The baffle plate 30 extends in the face width direction of the inter-cam gear 20, as shown in FIG.

Next, the operation of the oil discharge device for the oil separator will be described. The blow-by gas G generated in the crank chamber of the cylinder block flows into the oil separate chamber 6 via a passage (not shown). The oil mist in the blow-by gas G that has flowed into the oil separate chamber 6 is separated from the blow-by gas G by contact with the plurality of partition plates 8 and the like, becomes a liquid film, and flows down toward the bottom surface 6a. Since the bottom surface 6a is formed on an inclined surface,
The oil 7 flowing down to the bottom surface 6a flows toward the oil outlet 12.

Since the meshing portion of the two inter-cam gears 20 is located immediately below the oil outlet portion 12, the oil 7 from the oil outlet portion 12 drops to the meshing portion of the inter-cam gear 20. Since the inter-cam gear 20 is rotated by the cam shaft 16, the oil 7 dropped between the teeth of the inter-cam gear 20 moves in the rotation direction of the inter-cam gear 20. Here, the outer peripheral end of each inter-cam gear 20 and the inner wall surface 22,
24, the gaps b and b 'between the cams 24 are set as small as possible, so that the gears 20 between the cams function as circumscribed oil pumps, and the oil 7 from the oil outlet 12 is
Forcibly discharged to the cam chamber 14 side along 24. The oil 7 that has fallen between the inter-cam gears 20 is splashed up by the rotation of the inter-cam gear 20, but since the baffle plate 30 is provided immediately above the oil outlet section 12, the oil mist flows to the oil separation chamber 6. Bounce back is prevented. During operation of the engine, the inter-cam gear 20 always rotates, so that the oil discharging ability can be increased as compared with the related art in which oil is discharged using a pressure difference. Gear 20 between cams
The oil guided to the gears serves as a lubricating oil for the inter-cam gear 20, and thus contributes to a reduction in wear of the inter-cam gear 20.

In the above embodiment, the case where the gear is applied to the cam 20 between the cams of the DOHC has been described. All installed external gear can be used.

Although the above-described embodiment uses two gears that mesh with each other, only one gear can function as a gear pump in combination with the inner wall surface of the cylinder head cover. Can be forcibly discharged to the cam chamber side.

[0014]

According to the first aspect of the present invention, the existing gear provided to form the gear pump is disposed immediately below the oil outlet.
The oil separated and recovered from the blow-by gas in the oil separation chamber can be forcibly discharged, and the oil can be prevented from being blown out to the intake system. According to the oil discharge device of the oil separator of claim 2, the gear provided immediately below the oil outlet portion is a gear between cams of DOHC,
Since it is composed of one of the distributor drive gear and the vacuum pump drive gear, the existing gear can be used as a gear pump, and a new gear dedicated to oil discharge is not required.

[Brief description of the drawings]

FIG. 1 is a sectional view of an oil discharge device of an oil separator according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the apparatus of FIG. 1 viewed from another direction.

[Explanation of symbols]

 2 Cylinder head 4 Cylinder head cover 6 Oil separate chamber 7 Oil 12 Oil outlet 16 Camshaft 20 Gear between cams

Claims (2)

[Claims] 1. An oil separating chamber, an oil outlet from which oil separated and recovered from blow-by gas in the oil separating chamber flows, and a gear pump disposed immediately below the oil outlet to form a gear pump. Oil separator oil drain device consisting of existing gears. 2. The oil discharging device for an oil separator according to claim 1, wherein the gear is one of a DOHC inter-cam gear, a distributor driving gear, and a vacuum pump driving gear.