JP2010150929A - Oil recovery device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress carrying away of oil by blowby gas. <P>SOLUTION: The oil recovery device includes a housing 2 surrounding at least one part of a balance shaft 1 rotating in conjunction with a crankshaft of an internal combustion engine, an inlet 22 of blowby gas provided in an upper part of the housing 2, an outlet 23 of blowby gas provided in a lower part of the housing 2, and blades 16 provided on the balance shaft 1, rotated along with the balance shaft 1, and energizing the blowby gas from the inlet toward the outlet. Splashed oil is adhered to an inner wall of the housing 2, and then dripped from the outlet 23. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an oil recovery apparatus.

  A technique is known in which oil is once introduced into the balance shaft, and the oil is dropped into an oil pan by discharging the oil from the hole provided in the side surface of the balance shaft using the centrifugal force of the balance shaft. (For example, refer to Patent Document 1).

By the way, when oil splashes occur in the crankcase, the oil may be taken out of the crankcase by blow-by gas. In the prior art, many oil splashes are generated, so that the amount of oil carried away by blow-by gas may increase.
Japanese Patent Laid-Open No. 10-089415 Japanese Patent Laid-Open No. 7-12208 Japanese Utility Model Publication No. 61-11058

  The present invention has been made in view of the above-described problems, and an object thereof is to suppress oil from being taken away by blow-by gas.

In order to achieve the above object, the oil recovery apparatus according to the present invention employs the following means. That is, the oil recovery apparatus according to the present invention is
A housing that surrounds at least a portion of a balance shaft that rotates in conjunction with a crankshaft of the internal combustion engine;
An inlet for blow-by gas provided at the top of the housing;
A blow-by gas discharge port provided in a lower portion of the housing;
A blade provided on the balance shaft, rotating with the balance shaft, and energizing blow-by gas from the inlet to the outlet;
It is characterized by providing.

  Since the housing surrounds at least a part of the balance shaft, the balance shaft may penetrate the housing, but the blades are provided in the housing. That is, a blade is provided in a space surrounded by the housing, and an entrance and a discharge port are opened in the space.

  The blow-by gas is sucked into the housing by the action of the blades. Blow-by gas and splashed oil are urged by the blades and flow through the housing. The energized oil splash collides with the inner wall of the housing and adheres as it is. Oil also adheres to the balance shaft, but this oil is blown to the inner wall of the housing by the centrifugal force generated by the rotation of the balance shaft and adheres to the inner wall. When the amount of oil adhering to the inner wall of the housing increases, the oil flows downward along the wall surface due to gravity. These oils are dripped from an outlet provided in the lower part of the housing.

In this way, the oil can be recovered by collecting the oil in one place in the housing and returning it to the oil pan. And by dropping in a state where a certain amount of oil is collected, the mass becomes larger than that of the oil splash, so that it is possible to prevent the oil from being taken away by blow-by gas.

  In the present invention, an oil strainer may be provided below the discharge port. The oil strainer is a suction port when the oil pump sucks oil, and is provided with a filter. By arranging in this way, the oil dripped from the discharge port can be efficiently sucked from the oil strainer.

  According to the oil recovery device of the present invention, oil can be prevented from being taken away by blow-by gas.

  Hereinafter, specific embodiments of the oil recovery apparatus according to the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a schematic configuration of an oil recovery apparatus according to the present embodiment. A balance shaft 1 shown in FIG. 1 is provided in an internal combustion engine.

  The balance shaft 1 is supported by the housing 2 at three locations: a first support portion 11, a second support portion 12, and a third support portion 13. The housing 2 is formed so as to surround the space from the first support portion 11 to the third support portion 13 of the balance shaft 1. A first bearing 3 is fitted into the first support portion 11, a second bearing 4 is fitted into the second support portion 12, and a third bearing 5 is fitted into the third support portion 13. The first bearing 3, the second bearing 4, and the third bearing 5 are rolling bearings and are installed between the balance shaft 1 and the housing 2.

  A space surrounded by the housing between the first bearing 3 and the second bearing 4 is referred to as a first space 100, and a space surrounded by the housing between the second bearing 4 and the third bearing 5 is a second space. 200.

  The balance shaft 1 in the first space 100 is provided with a balance shaft gear 14 whose center axis coincides with the balance shaft 1. The balance shaft gear 14 meshes with the crank gear 6 that rotates integrally with the crankshaft. The housing 2 is provided with a long hole 21 that is an inlet of the crank gear 6. An oil passage 61 for supplying oil to the meshing portion between the crank gear 6 and the balance shaft gear 14 is provided inside the crank gear 6. In the oil passage 61, a part of the oil supplied into the crankshaft circulates.

  A balancer 15 is provided on the balance shaft 1 in the second space 200. The balancer 15 is eccentric from the central axis of the balance shaft 1, and a cross-sectional shape by a plane orthogonal to the central axis of the balance shaft 1 is, for example, a fan shape. A blade 16 is attached adjacent to the balancer 15. FIG. 2 is a view of the blade 16 as seen from the third support portion 13 side of FIG. The blade 16 may be manufactured separately from the balance shaft 1 and may be fitted into the balance shaft 1 later. The blade 16 functions as a blower by rotating around the central axis of the balance shaft 1. Then, gas and oil splashes in the balance shaft 1 are urged from the second bearing 4 toward the third bearing 5.

An entrance 22 that is an inlet for blow-by gas and oil is provided in an upper part of the housing 2 that forms the second space 200. In addition, a discharge port 23 that is an outlet for blow-by gas and oil is provided in the lower portion of the housing 2 that forms the second space 200. Outlet 2
3 is provided above an oil strainer 7 which is an oil suction port of the oil pump.

  The balance shaft 1 configured as described above rotates by obtaining a driving force from the crank gear 6. The oil supplied from the oil passage 61 is splashed by the balance shaft gear 14. Then, a part of them adheres to the first bearing 3 and the second bearing 4 so that the first bearing 3 and the second bearing 4 are lubricated. Further, when the blades 16 are rotated, the gas in the housing 2 is discharged from the discharge port 23. As a result, the pressure in the housing 2 decreases, and blow-by gas is introduced from the inlet 22. Further, the oil passes through the second bearing 4 from the first space 100 toward the second space 200.

  Further, the oil in the blow-by gas urged by the blades 16 collides with the inner wall of the housing 2 near the third bearing 5. On the other hand, the oil adhering to the balance shaft 1 is blown off by the centrifugal force generated by the rotation of the balance shaft 1 and adheres to the inner wall of the housing 2. These oils adhering to the housing 2 flow downward due to gravity when they reach a certain amount. Then, it is dropped from the discharge port 23 onto the oil pan near the oil strainer 7. In addition, since a part of the splash oil urged by the blades 16 adheres to the third bearing 5, the third bearing 5 can be lubricated.

  Moreover, although blowby gas is also discharged | emitted from the discharge port 23, splash oil is hardly contained in this blowby gas. Here, the splash oil is removed by adhering to the wall surface in the housing 2. Further, since the oil dripping from the discharge port 23 has a large mass, it falls toward the lower side of the oil pan without getting on the flow of blow-by gas. Therefore, according to the present Example, it can suppress that splashed oil is carried away by blow-by gas. Moreover, since oil droplets are supplied to the 1st bearing 3, the 2nd bearing 4, and the 3rd bearing 5, resistance can be reduced compared with the case where a lot of oil is supplied.

  The first space 100 may also be provided with blades that are provided in the second space 200. That is, the gas flow may be generated so that the splashed oil is biased toward the first bearing 3 or the second bearing 4. Thereby, the 1st bearing 3 and the 2nd bearing 4 can be lubricated suitably. Further, oil dropped from the crankshaft or piston may be introduced from the entrance 22.

It is a figure which shows schematic structure of the oil collection | recovery apparatus which concerns on an Example. It is the figure which looked at the blade | wing from the 3rd support part side of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Balance shaft 2 Housing 3 1st bearing 4 2nd bearing 5 3rd bearing 6 Crank gear 7 Oil strainer 11 1st support part 12 2nd support part 13 3rd support part 14 Balance shaft gear 15 Balancer 16 Blade 21 Long hole 22 Entrance 23 Discharge 61 Oil passage 100 First space 200 Second space

Claims (2)

A housing that surrounds at least a portion of a balance shaft that rotates in conjunction with a crankshaft of the internal combustion engine;
An inlet for blow-by gas provided at the top of the housing;
A blow-by gas discharge port provided in a lower portion of the housing;
A blade provided on the balance shaft, rotating with the balance shaft, and energizing blow-by gas from the inlet to the outlet;
An oil recovery apparatus comprising:   The oil recovery apparatus according to claim 1, wherein an oil strainer is provided below the discharge port.

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