JP2914263B2 - Breather device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breather device for separating gas (hereinafter referred to as "blow-by gas") leaking into a crankcase from between a piston and a cylinder of an automobile engine into a gas component and an oil component. .

[0002]

2. Description of the Related Art A breather device for separating blow-by gas retained in a crankcase of an automobile engine into a gas component and an oil component is provided on a cylinder head cover 1 as shown in FIG. This breather apparatus is provided with a breather chamber 2 as shown in FIGS. 4 and 5, and a gas inlet 3 is formed at the front of the bottom of the breather chamber 2.

The gas inlet 3 communicates with the inside of a crankcase 20 through a blow-by gas inlet 19 formed in a cylinder head 18 as shown in FIG. The blow-by gas that has flowed in is separated into a gas component and an oil component by an oil separator 4 provided at the center of the breather chamber 2.

The oil separator 4 is provided with a plurality of oil separation plates 5 formed by forming a large number of small holes in a metal plate, and the oil separated from the blow-by gas by these oil separation plates 5. The components flow from the center of the breather chamber 2 toward the rear thereof on the bottom of the breather chamber 2 and flow into an oil discharge port 6 formed at the rear of the bottom of the breather chamber 2. The oil outlet 6 communicates with an oil return pipe 7 serving as an oil exhaust pipe connected to the cylinder head cover 1, and the oil component flowing into the oil exhaust port 6 flows through the oil return pipe 7 and the crankcase 20. Is to be returned inside.

On the other hand, the blow-by gas that has passed through the oil separator 4 flows into a gas outlet 8 formed at the rear of the side wall surface of the breather chamber 2. The gas discharge port 8 communicates with a blow-by gas discharge pipe 9 connected to the cylinder head cover 1. The blow-by gas flowing into the gas discharge port 8 flows through the blow-by gas discharge pipe 9 and is discharged from the breather chamber 2. It has become so.

By the way, in the cylinder head cover 1 having such a structure, when the blow-by gas that has passed through the oil separator 4 flows directly into the gas discharge port 8, the oil component not separated by the oil separator 4 is removed together with the blow-by gas. There is a risk of being discharged from the breather chamber 2. Therefore, conventionally, a baffle plate 10 is provided downstream of the oil separator 4, and blow-by gas that has passed through the oil separator 4 collides with the baffle plate 10.

[0007]

In the prior art described above, the blow-by gas that has passed through the oil separator 4 does not directly flow into the gas outlet 8, so that the oil components not separated by the oil separator 4 are removed. Although it can be prevented from being discharged from the breather chamber 2 together with the blow-by gas,
There were the following problems.

That is, in the above-described prior art, the baffle 1
Since the blow-by gas colliding with zero flows mainly through the space portion 11 formed between the baffle plate 10 and the bottom surface of the breather chamber 2 and flows into the gas discharge port 8, the cylinder head cover 1 is in a state of rising forward, In addition, when a large amount of blow-by gas is generated and a large amount of oil components separated by the oil separator 4 accumulate at the rear of the bottom of the breather chamber 2,
Alternatively, if the internal pressure of the cylinder head cover 1 becomes significantly higher than the internal pressure of the breather chamber 2 due to clogging of the oil separation plate 5, the oil flows backward from the oil return pipe 7 and accumulates on the bottom of the breather chamber 2. When the blow-by gas flowing through the space 11 rises against the rear wall of the breather chamber 2 and rises, the oil component accumulated at the rear bottom of the breather chamber 2 may be entrained, whereby the oil component is blown together with the blow-by gas. There was a risk of being discharged from the chamber 2.

The present invention has been made in view of the above problems, and has as its object to prevent oil components not separated by an oil separator from being discharged from a breather chamber together with blow-by gas and to prevent oil separation. It is an object of the present invention to provide a breather device capable of discharging only blow-by gas from the breather chamber even if the oil component separated by the vessel accumulates at the rear of the bottom of the breather chamber.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is a cylinder head cover having a breather chamber communicating with the inside of a crankcase of an automobile engine, and a cylinder head cover connected to the cylinder head cover. An oil discharge pipe for discharging the oil component separated from the blow-by gas by the oil separator from the breather chamber through an oil discharge port formed in a bottom surface of the breather chamber; and an oil separator connected to the cylinder head cover. A blow-by gas discharge pipe for discharging the blow-by gas that has passed through the breather chamber through a gas discharge port formed on a side wall surface of the breather chamber, wherein the blow-by gas discharge pipe is connected to the breather from the gas discharge port. has a tip portion that protrudes into the chamber, the blow only on the tip portion Form a gas flow inlet Igasu flows
And the blow-by gas discharge pipe at the tip end.
It is characterized in that the end face in the axial direction of the flow path is closed .

According to a second aspect of the present invention, in the first aspect of the present invention, the flow of the blow-by gas passing through the oil separator is directed to the side wall surface of the breather chamber and the ceiling surface of the breather chamber. A gas guide for changing the flow to guide the blow-by gas to the gas inlet is provided.

According to a third aspect of the present invention, in the second aspect of the invention, the gas guide has a collision plate against which blow-by gas having passed through the oil separator collides, and the blow-by gas is separated from the collision plate by the collision plate. It is characterized in that the space is formed between the side wall surface of the breather chamber and the ceiling surface of the breather chamber, and is guided to the gas inlet .

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIG. The same parts as those shown in FIGS. 4 and 5 are denoted by the same reference numerals and described. In the figure, reference numeral 2 denotes a breather chamber of a breather device provided in the cylinder head cover, and a gas inlet 3 (see FIG. 2) is formed at the front of the bottom of the breather chamber 2.

The gas inlet 3 communicates with the inside of a crankcase (not shown). The blow-by gas flowing into the breather chamber 2 from the gas inlet 3 is supplied to an oil separator provided at the center of the breather chamber 2. 4 separates the gas component and the oil component.

The oil separator 4 includes a plurality of oil separation plates 5 formed by forming a large number of small holes in a metal plate.
The oil component separated from the blow-by gas by the oil separation plates 5 flows from the center of the breather chamber 2 to the rear of the breather chamber 2 at the bottom of the breather chamber 2, and an oil discharge port 6 formed at the rear of the bottom of the breather chamber 2. It is designed to flow into. The oil outlet 6 communicates with an oil return pipe 7 serving as an oil discharge pipe connected to the cylinder head cover 1, and the oil component flowing into the oil outlet 6 flows through the oil return pipe 7 to be in the crankcase. Is to be returned to.

On the other hand, the blow-by gas having passed through the oil separator 4 is discharged from the breather chamber 2 through a gas discharge port 8 formed at the rear of the side wall surface of the breather chamber 2.

A blow-by gas discharge pipe 9 is hermetically inserted into the gas discharge port 8 from the outside of the cylinder head cover 1, and its tip 9 a projects from the gas discharge port 8 into the breather chamber 2.

The tip 9a of the blow-by gas discharge pipe 9
Protrudes to the vicinity of the center of the breather chamber 2, and a gas inlet 12 into which the blow-by gas flows is formed by cutting the blow-by gas discharge pipe 9 in a horizontal direction. In addition, the opening at the end of the blow-by gas discharge pipe 9 is closed by a closing member 13.

The breather chamber 2 is provided with a gas guide 14 for guiding blow-by gas that has passed through the oil separator 4 to the rear of the breather chamber 2. This gas guide 1
4 is provided with a collision plate 15 against which blow-by gas having passed through the oil separator 4 collides. Between the collision plate 15 and the side walls 2a, 2b and the ceiling surface 2c of the breather chamber 2,
As shown in FIG. 3, space portions 16a, 16b, and 16c are formed.

The gas guide 14 has a plate-like support member 17 for supporting the collision plate 15 perpendicular to the bottom surface of the breather chamber 2. A space portion 11 for allowing the oil component separated by the oil separator 4 to flow is formed therebetween.

According to such a structure, the oil separator 4
The blow-by gas that has passed through the
5 and the flow direction of the blow-by gas is mainly directed to the side walls 2a and 2b of the breather chamber 2 (arrows F1 and F2 in FIG. 2) and to the ceiling surface 2c of the breather chamber 2 by the collision plate 15. (Arrow F3 in FIG. 1). The blow-by gas flowing toward the side walls 2a, 2b and the ceiling surface 2c of the breather chamber 2 is subjected to the collision plate 15 and the side walls 2a, 2b and the ceiling surface 2 of the breather chamber 2.
c through the spaces 16 a, 16 b, 16 c formed between the blow-by gas discharge pipe 9 and the gas inlet 12 formed at the tip 9 a of the blow-by gas discharge pipe 9. 9 and discharged from the breather chamber 2.

Accordingly, in one embodiment of the present invention, the blow-by gas that has passed through the oil separator 4 as in the above-described prior art forms the space 11 formed between the baffle plate 10 and the bottom surface of the breather chamber 2. Rather than mainly circulating,
The blow-by gas that has passed through the oil separator 4 is
The air flows mainly through the spaces 16a, 16b, 16c formed between the air-conditioner and the side walls 2a, 2b and the ceiling 2c of the breather chamber 2, so that the flow velocity of the blow-by gas flowing through the space 11 can be reduced. . As a result, even if the oil component separated by the oil separator 4 accumulates at the rear portion of the bottom of the breather chamber 2, the blow-by gas does not entrain the oil component.
Can be discharged from

In one embodiment of the present invention, the blow-by gas that has passed through the oil separator 4 collides with the collision plate 15 of the gas guide 14 and then flows into the blow-by gas discharge pipe 9. The unseparated oil components are not discharged from the breather chamber 2 together with the blow-by gas.

Further, in one embodiment of the present invention, the tip 9a of the blow-by gas discharge pipe 9 is projected from the gas outlet 8 into the breather chamber 2, and the blow-by gas is blown through the gas inlet 12 formed above the tip 9a. Gas breather room 2
The blow-by gas that has collided with the collision plate 15 is discharged from the collision plate 15 and the side wall surface 2 of the breather chamber 2.
a, 2b and space 1 formed between ceiling surface 2c
6a, 16b, and 16c can be circulated and discharged from the breather chamber 2, thereby reliably preventing oil from being taken up by blow-by gas.

In one embodiment of the present invention, the tip 9a of the blow-by gas discharge pipe 9 protruding into the breather chamber 2 is cut in the horizontal direction to form the gas inlet 12, so that the collision plate 15 and the breather chamber 2 are formed. 2 space portions 16a, 16 formed between side wall surfaces 2a, 2b and ceiling surface 2c.
b, 16c through the gas inlet 12
, So that the oil can be reliably prevented from being taken up by the blow-by gas. Note that the present invention is not limited to the above-described embodiment, and various embodiments are possible without departing from the gist of the present invention.

[0026]

As described above, according to the first aspect of the present invention, the oil components not separated by the oil separator are not discharged from the breather chamber together with the blow-by gas, and are separated by the oil separator. Even if the collected oil component accumulates at the rear of the bottom of the breather chamber, only the blow-by gas can be discharged from the breather chamber. According to the second and third aspects of the present invention, in addition to the effect of the first aspect of the present invention, it is possible to reliably prevent oil from being wound up by blow-by gas.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a breather device for explaining a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a longitudinal sectional view of a breather device for explaining a conventional technique.

FIG. 5 is a sectional view taken along the line CC of FIG. 4;

FIG. 6 is a side view of a cylinder head cover provided with a breather device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cylinder head cover 2 ... Breather chamber 4 ... Oil separator 6 ... Oil discharge port 7 ... Oil return pipe (oil discharge pipe) 8 ... Gas discharge port 9 ... Blow-by gas discharge pipe 12 ... Gas inlet 14 ... Gas guide 15 ... collision plates 16a, 16b, 16c ... space

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F01M 13/04 B01D 45/08

Claims (3)

(57) [Claims] A cylinder head cover having a breather chamber in communication with a crankcase of an automobile engine; and an oil separator connected to the cylinder head cover and separated from the blow-by gas by the oil separator. An oil discharge pipe for discharging from the breather chamber through an oil discharge port formed on the bottom surface of the breather chamber; A blow-by gas exhaust pipe that discharges from the breather chamber through an outlet, the blow-by gas exhaust pipe having a tip protruding from the gas outlet to the breather chamber, and an upper part of the tip .
To form the gas inlet of the mini the blow-by gas flows
And the flow path of the blow-by gas discharge pipe at the tip end.
A breather device for closing an axial end face . The method according to claim 2, wherein the breather chamber, the gas flow the blow-by gas by changing the flow of blow-by gas that has passed through the oil separator to flow toward the ceiling surface of the side wall surface and the breather chamber of the breather chamber 2. The breather device according to claim 1, further comprising a gas guide for guiding to an inlet . 3. The gas guide has a collision plate against which blow-by gas having passed through the oil separator collides, and the blow-by gas is supplied to the collision plate and a side wall surface of the breather chamber and a ceiling surface of the breather chamber. 3. The breather device according to claim 2, wherein the gas flows through a space formed between the gas inlet and the gas inlet .