JPH1026012A - Oil separator for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively separate oil in blowby gas and to efficiently return the separated oil to the interior of an engine. SOLUTION: An oil separate for an engine comprises a baffle plate 13 arranged on the inner surface of a cylinder head cover 12 in which the inlet hole 17 for blowby gas is formed; a plurality of partition plates 16a and 16b to partition a blowby chamber 14, consisting of the baffle plate 13 and the inner surface of a cylinder head cover 12, in a zigzagging state; and a discharge hole 12a to discharge blowby gas. A partition plate consists of a first partition plate 16a suspended from the inner surface of a cylinder head cover; and a second partition plate 16b erected on the baffle plate 13. A first oil discharge port 18a is formed in the vicinity of a position below the first partition plate 16a of the baffle 13 and a second oil discharge port 18b is formed in a position in the vicinity of the base end of the second partition plate 16b.

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 an engine in which blow-by gas travels in a meandering manner inside a blow-by chamber formed inside a cylinder head cover and is separated into gas and liquid by a plurality of partition plates. .

[0002]

2. Description of the Related Art Generally, an engine is driven by sucking a mixture of fuel and air into a cylinder, compressing the mixture with a piston, and then igniting to explode. In this case, the piston and the cylinder are smoothly driven. Since it is necessary to slide, there is a minute gap between them, and leakage from this gap is prevented by a piston ring or the like.
However, the leakage of high-pressure gas during compression and explosion cannot be completely stopped, and the reality is that a small amount of leakage, that is, blow-by gas cannot be prevented. This blow-by gas needs to be discharged to the outside in order to fill the inside of the crankcase and the cylinder head cover communicating therewith.

However, the crankshaft, the connecting rod, and the like move at a high speed in the crankcase, and the rocker arm, the valve, and the like also operate in the cylinder head cover communicating with the crankcase.
For this reason, the oil is scattered inside the crankcase and the cylinder head cover and is filled with mist.
Therefore, directly discharging the blow-by gas to the outside also discharges the mist oil mixed with the blow-by gas, which leads to an increase in oil consumption of the engine.
There is also a problem that a pipe for discharging gas is clogged with oil.

In order to solve these problems, there is known an oil separator for an engine in which blow-by gas travels in a meandering manner and is separated into gas and liquid by a plurality of partition plates. This oil separator adheres oil to the partition plate when the blow-by gas passes through the inside of the blow-by chamber formed inside the cylinder head cover in a meandering manner, and discharges only the blow-by gas from which the oil has been separated to the outside. .
The oil separator separates the oil mixed into the blow-by gas, preventing unnecessary consumption of oil and preventing the external appearance from being impaired by the dirt attached to the oil discharged outside. Has become.

[0005]

However, in the conventional oil separator, since the blow-by gas travels in a substantially planar manner inside the blow-by chamber formed in the cylinder head cover, the oil once adhered to the partition plate. Is again guided by the flow of the blow-by gas and is discharged to the outside. In order to solve this problem, there is known an oil separator for an engine in which a groove for collecting oil adhering to a partition plate and returning the oil to the inside of the engine is formed (Japanese Utility Model Laid-Open No. 59-110317). However, there is also a problem that the oil flows back to the blow-by gas again because the flow path of the oil is relatively long. The purpose of the present invention is
It is an object of the present invention to provide an engine oil separator capable of effectively separating oil in blow-by gas and efficiently reducing the separated oil inside the engine.

[0006]

The invention according to claim 1 is
As shown in FIG. 1, a baffle plate 13 provided with an inlet hole 17 for blow-by gas and provided on an inner surface of a cylinder head cover 12, and a blow-by chamber 1 formed by the baffle plate 13 and the inner surface of the cylinder head cover 12.
4 is an improvement in an engine oil separator having a plurality of partition plates 16a and 16b for dividing the cover 4 in a meandering shape and a blow-by gas discharge hole 12a for discharging blow-by gas passing through the plurality of partition plates 16a and 16b. The characteristic configuration of the baffle plate 13 is that a plurality of partition plates 16 a and 16 b are composed of a first partition plate 16 a vertically provided from the inner surface of the cylinder head cover and a second partition plate 16 b provided upright on the baffle plate 13. A first oil discharge port 18a is formed near a position below the first partition plate 16a, and a second oil discharge port 18b is formed near the base end of the second partition plate 16b of the baffle plate 13. The first partition plate 16a is suspended from the inner surface of the cylinder head cover,
A second partition plate 16b is provided upright on the baffle plate 13, and the first oil outlet 18a and the second oil outlet 1
8b is formed below the first partition plate 16a and at a position near the base end of the second partition plate 16b, so that the oil separated by the first and second partition plates 16a and 16b is transferred from the blow-by chamber 14 into the engine. Discharge effectively.

The invention according to claim 2 is the invention according to claim 1, wherein after passing through the second partition plate 16b, the sectional area of the flow path through which the blow-by gas flows before passing through the second partition plate 16b. This is an oil separator for an engine in which a baffle plate 13 is formed such that the cross-sectional area of a flow path through which blow-by gas flows increases. By forming the baffle plate 13 so as to increase the cross-sectional area of the flow path through which the blow-by gas flows after passing through the second partition plate 16b, the blow-by gas after passing through the second partition plate 16b is decelerated, and The oil that has been conveyed by the relatively high flow rate of the gas is separated by falling due to its own weight.

A third aspect of the present invention is the invention according to the first or second aspect, wherein the second partition plate 16b is erected inclining toward the flow of the blow-by gas and both sides thereof flow. This is an engine oil separator formed by projecting blow-by gas so as to be collected at the center. The second partition plate 16b is erected so as to be inclined toward the flow of the blow-by gas, and is formed so as to protrude so that the blow-by gas flowing on both sides thereof is gathered at the central portion, so that the oil in the blow-by gas can be effectively used. Is separated.

The invention according to claim 4 is the invention according to claims 1 to 3
The baffle plate 13
Is a second flat plate in which the blow-by chamber 14 is enlarged and a second partition plate 16b is erected through a first flat plate portion 13a having an inlet hole 17 and a first inclined portion 13b following the first flat plate portion 13a. Portion 13c, a third flat plate portion 13e formed on substantially the same plane as the first flat plate portion 13a through a second tilted portion 13d following the second flat plate portion 13c, a second partition plate 16b, and a second tilted portion 13b. And a third oil discharge hole 18c formed in the second flat plate portion 13c between the third oil discharge hole 18c and the third oil discharge hole 18c to guide oil adhering to the third flat plate portion 13e to the second inclined portion 13d. The inclined groove 19 to be discharged is an engine oil separator formed in the third flat plate portion 13e. By forming the inclined groove 19 in the third flat plate portion 13e, the inclined groove 19 guides the oil adhering to the third flat plate portion 13e to the second inclined portion 13d and further effectively flows out from the third oil outlet 18c. .

[0010] The invention according to claim 5 is the invention according to claims 1 to 4.
And a breather pipe 21 having one end inserted into the blow-by gas discharge hole 12a and the other end projecting from the cylinder head cover 12 and a breather hose 22 fitted therein. The other end is an engine oil separator formed by being bent inside the breather pipe 21. Breather pipe 21
The other end of the breather hose 2 is formed by bending inward to form the oil breather hose 2 attached to the breather pipe 21.
Prevent outflow into 2.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. As shown in FIGS. 1 and 2,
The oil separator 11 includes a baffle plate 13 provided on the inner surface of the cylinder head cover 12, and a plurality of partition plates 16a and 16b which partition the blow-by chamber 14 formed by the baffle plate 13 and the inner surface of the cylinder head cover 12 in a meandering manner. Be composed. The baffle plate 13 in the present embodiment is blow-by through a first flat plate portion 13a in which an inlet hole 17 for a blow-by gas to flow into the blow-by chamber 14 is formed and a first inclined portion 13b following the first flat plate portion 13a. The first flat portion 13c is formed by being displaced downward so as to enlarge the chamber 14, and the first flat portion 13d is provided via a second inclined portion 13d following the second flat portion 13c.
Third flat plate portion 13e formed on substantially the same plane as flat plate portion 13a
And Although not shown, the attachment of the baffle plate 13 into the cylinder head cover 12 is performed by attaching a male screw to a female screw at a tip end of a boss formed in the cylinder head cover 12 through an attachment hole 13 f (FIG. 2) formed in the baffle plate 13. It can be attached by screwing. A blow-by gas discharge hole 12a for discharging the blow-by gas to the outside is formed on the side wall of the cylinder head cover 12 located on the outlet side of the blow-by chamber 14.

The plurality of partition plates 16a and 16b are composed of a first partition plate 16a vertically provided from the inner surface of the cylinder head cover 12 and a second partition plate 16b provided upright on the baffle plate 13. The top surface of the cylinder head cover 12 at a position above the corner formed by the first inclined portion 13b and the second flat plate portion 13c of the baffle plate 13 bulges downward, and is formed integrally with the cylinder head cover 12. . The second partition plate 16b is configured such that the cross-sectional area of the flow path through which the blow-by gas flows after passing through the second partition plate 16b is larger than the cross-sectional area of the flow path through which the blow-by gas flows before passing through the second partition plate 16b. The baffle plate 13 is erected on the second flat plate portion 13c. As shown in FIG. 2, the center of the second partition plate 16b is slightly bent, and the bent sides of the second partition plate 16b collect the flowing blow-by gas at the center as shown by solid arrows in the drawing. Formed overhanging. Second partition plate 16b
A bent portion 16c is formed at the lower portion of the second flat portion 13c. The bent portion 16c is brought into contact with the second flat plate portion 13c and resistance-welded to be inclined toward the flow of the blow-by gas so as to be erected on the second flat plate portion 13c. .

As shown in FIGS. 1 and 2, a second plate portion 13c of the baffle plate 13 located below the first partition plate 16a has a first oil discharge port 18a and a second oil plate 18b. The second flat plate portion 13c near the base end has the second
Each of the oil outlets 18b is formed. Furthermore, the second
The second flat plate portion 1 between the partition plate 16b and the second inclined portion 13d
A third oil outlet 18c is formed in 3c. The first and second oil discharge ports 18a and 18b are collected by the first and second partition plates 16a and 16b, respectively, and are configured to discharge the adhered oil from the blow-by chamber 14 into the engine. Third flat plate portion 1 of baffle plate 13
An inclined groove 19 that is inclined toward the second inclined portion 13d is formed in the center of the third flat portion 1e.
The oil adhering to 3e is guided to the second inclined portion 13d, and is further discharged from the third oil outlet 18c.

The base end of the breather pipe 21 is inserted into the discharge hole 12a formed in the cylinder head cover 12 from outside. As shown in FIG. 1, the breather pipe 21 has a substantially central portion and the other end bulging out, and the bulging portion 21 a at the central portion has a role as a stopper when the base end is pressed into the cylinder head cover 12. And the bulging portion 21b on the other end side
Has a role as a stopper when the breather hose 22 is fitted. Accordingly, when one end of the breather pipe 21 is mounted, the other end protrudes from the cylinder head cover 12, and the breather hose 22 is fitted to the protruding breather pipe 21 by the stopper 23. The other end of the breather pipe 21 is formed by being bent inside the breather pipe 21 so as to prevent oil adhering to the inside of the breather pipe 21 from flowing into the breather hose 22.

In the oil separator in the low-by gas configured as described above, the blow-by chamber 14
The blow-by gas that has entered the cylinder is bent by the top surface of the cylinder head cover 12 and collides with the first partition plate 16a first as shown by an arrow A in FIG.
The oil adheres to the partition plate 16a and is separated. The oil adhered to and separated from the first partition plate 16a then falls by its own weight while adhering to the first partition plate 16a, drops from the lower end of the first partition plate 16a, and passes through the first oil discharge port 18a into the engine. Is reduced to

Next, the blow-by gas is supplied to the first partition plate 16.
a to change the course downward, and as shown by the arrow B in FIG. 1, guided by the first inclined portion 13b, the second partition plate 16b
And the oil adheres to and separates from the second partition plate 16b due to the momentum. In particular, as shown in FIG. 2, the second partition plate 16b is erected so as to be inclined toward the flow of the blow-by gas, and is formed so as to protrude so that the blow-by gas flowing on both sides thereof is collected at the center. Because
The oil in the blow-by gas can be effectively separated. The oil attached to and separated from the second partition plate 16b then falls by its own weight while attached to the second partition plate 16b, and is returned into the engine from the second oil discharge port 18b.

Returning to FIG. 1, next, the blow-by gas changes its course upward by the second partition plate 16b and passes through the second partition plate 16b as shown by the arrow C in FIG. Second
The blow-by gas after passing through the partition plate 16b is decelerated due to an increase in the cross-sectional area of its flow path, and the oil carried at a relatively high flow rate of the blow-by gas drops due to its own weight. The oil that drops is the second
The second flat plate portion 13c behind the partition plate 16b, the second inclined portion 13
d and the third flat plate portion 13e. The oil adhering to the third flat plate portion 13e is guided to the second inclined portion 13d by the inclined groove 19, and then descends together with the oil adhering to the second inclined portion 13d while being attached to the second inclined portion 13d by its own weight. 3 The oil is returned to the engine through the oil outlet 18c. Finally, the blow-by gas reaches the breather pipe 21 and, via the breather hose 22, FIG.
As shown by the arrow E in FIG.
At this time, the other end of the breather pipe 21 is formed to be bent inward, so that the oil D attached to the breather pipe 21 is prevented from flowing out into the breather hose 22.

[0018]

As described above, according to the present invention, the plurality of partition plates are constituted by the first partition plate vertically provided from the inner surface of the cylinder head cover and the second partition plate provided on the baffle plate. Since the first oil discharge port is formed near the position below the first partition plate of the baffle plate and the second oil discharge port is formed near the base end of the second partition plate, the first and second partition plates are used. The separated oil can be effectively reduced from the blow-by chamber to the inside of the engine. Also,
If the baffle plate is formed so that the cross-sectional area of the flow path through which the blow-by gas flows after passing through the second partition plate is increased, the blow-by gas is relatively fast due to the deceleration of the blow-by gas after passing through the second partition plate. The oil conveyed by the flow velocity can be separated by lowering by its own weight.

Further, if the second partition plate is erected inclining toward the flow of the blow-by gas and is formed so as to protrude so that the blow-by gas flowing on both sides thereof is collected at the central portion, the blow-by gas is more effectively used. Oil in the gas can be separated. By forming the inclined groove in the third flat plate portion, the inclined groove guides the oil adhering to the third flat plate portion to the second inclined portion and further effectively flows out from the third oil outlet, so that the oil is once separated. Oil can be prevented from being discharged to the outside again by the flow of the blow-by gas. Furthermore, if the other end of the breather pipe is bent inward, the oil adhering to the breather pipe is prevented from flowing out into the breather hose. As a result, it is possible to effectively prevent the separated oil from being discharged to the outside.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an oil separator of the present invention.

FIG. 2 is a perspective view of a baffle plate including a second partition plate and a groove.

[Explanation of symbols]

 12 Cylinder head cover 12a Discharge hole 13 Baffle plate 13a First flat plate portion 13b First inclined portion 13c Second flat plate portion 13d Second inclined portion 13e Third flat plate portion 14 Blow-by chamber 16a First partition plate 16b Second partition plate 17 Inlet hole 18a first oil outlet 18b second oil outlet 18c third oil outlet 19 inclined groove 21 breather pipe 22 breather hose

Claims (5)

[Claims] A baffle plate (13) provided with an inlet hole (17) for blow-by gas and provided on an inner surface of a cylinder head cover (12), and formed by the baffle plate (13) and an inner surface of the cylinder head cover (12). A plurality of partition plates (16a, 16b) that partition the blow-by chamber (14) to be meandered, and a blow-by gas discharge hole (12a) that discharges the blow-by gas that has passed through the plurality of partition plates (16a, 16b). An oil separator for an engine comprising: a plurality of partition plates (16a, 16b), a first partition plate (16a) suspended from an inner surface of the cylinder head cover, and a second partition plate (16a) standing upright on the baffle plate (13). A first oil discharge port (18a) is formed near a position below the first partition plate (16a) of the baffle plate (13), and the baffle plate (13) At the position near the base end of the second partition plate (16b), Oil separator of the engine, characterized in that Le outlet (18b) is formed. 2. The cross-sectional area of the flow path through which the blow-by gas flows before passing through the second partition plate (16b).
The oil separator for an engine according to claim 1, wherein the baffle plate (13) is formed such that the cross-sectional area of the flow path through which the blow-by gas flows after passing through (b) is increased. 3. The second partition plate (16b) is erected so as to be inclined toward the flow of the blow-by gas, and is formed so that both sides thereof protrude so as to collect the flowing blow-by gas at a central portion. 3. The engine oil separator according to 1 or 2. 4. The baffle plate (13) includes a first flat plate portion (13a) having an inlet hole (17) formed therein and a first inclined portion (13b) following the first flat plate portion (13a). The second flat plate portion (13) in which the blow-by chamber (14) is enlarged and the second partition plate (16b) is erected
c) and a third plate formed substantially flush with the first flat plate portion (13a) via a second inclined portion (13d) following the second flat plate portion (13c).
A flat plate portion (13e), the second partition plate (16b), and the second inclined portion
(13b) and a third oil discharge hole (18c) formed in the second flat plate portion (13c), and the oil adhering to the third flat plate portion (13e) is removed by the second inclined portion. (13d)
The oil separator for an engine according to any one of claims 1 to 3, wherein an inclined groove (19) flowing out from an oil discharge hole (18c) is formed in the third flat plate portion (13e). 5. A breather pipe (21) having one end inserted into the blow-by gas discharge hole (12a) and the other end projecting from the cylinder head cover (12) and fitted with a breather hose (22). The engine oil separator according to any one of claims 1 to 4, wherein the other end of the breather pipe (21) is formed by being bent inside the breather pipe (21).