JPH06288219A - Breather device - Google Patents

Abstract

PURPOSE:To provide a breather device capable of curtailing the number of parts and assembly manday and omitting a sealant. CONSTITUTION:In an internal combustion engine to connect a breather chamber 9 to an air suction system, the breather chamber 9 including a pipe to the air suction system is acquired by integral mounding, and the breather chamber 9 is installed on a head cover 2. By fastening the breather chamber 9 acquired by integral mounding on the head cover 2, it is possible to omit a breather plate, a bolt to fix the breather plate and a sealant, and accordingly, it is possible to curtail the number of parts. Additionally, as the bolt to fix the breather plate and the sealant are omitted, their assembly manday is eliminated, and accordingly, it is possible to curtail assembly manday.

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 an internal combustion engine mounted on a vehicle such as an automobile.

[0002]

2. Description of the Related Art In an internal combustion engine mounted on a vehicle such as an automobile, most of the gas burned in a combustion chamber is discharged from an exhaust valve, but a small part of the gas passes through a gap between piston rings and blow-by. Enter the crankcase as gas. The blow-by gas is guided from the crankcase to the head side, separated into oil mist and blow-by gas in the breather chamber in the head cover, and the circulation system is introduced to guide the blow-by gas to the intake system. As a related art related to this, there is one described in Japanese Utility Model Publication No. 1-88013.

An example of a breather device used in such a circulation system is a breather device 1 shown in FIGS. 4 to 6. In the figure, a breather chamber 5 is formed by fastening a bolt 4 or welding a breather plate 3 to a head cover 2. Then, a pipe 7 communicating with the intake system 6 is connected to the breather chamber 5, and the blow-by gas G is guided to the intake system 6 through the pipe 7.

[0004]

By the way, in the breather device 1 described above, it is necessary to process the screw portion for fixing the breather plate 3 on the head cover 2, and the bolt 4 for fixing the breather plate 3 and the assembling work thereof are required. It was necessary, and it was necessary to prepare the sealant 8 for the joint between the head cover 2 and the breather plate 3.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a breather device capable of reducing the number of parts and the number of assembling steps and omitting a sealant.

[0006]

In order to achieve the above object, the present invention is an internal combustion engine in which a breather chamber is connected to an intake system, wherein a breather chamber including a pipe connected to the intake system is obtained by integral molding. The breather chamber is attached to the head cover.

[0007]

With this structure, since the breather chamber obtained by integrally molding is fastened to the head cover, the conventional breather device requires the breather plate, the bolt for fixing the breather plate, and the sealant. However, these can be omitted. The assembly work is eliminated by omitting the bolt and the sealant for fixing the breather plate.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A breather device 1 according to an embodiment of the present invention will be described below with reference to FIGS. In the figure, the breather chamber 9 made of resin is manufactured by integral molding.
In this case, the breather chamber 9 is a pipe connected to the intake system 6.
It is formed of 10 in one. Head cover 2
A hole 11 for inserting the pipe 10 is formed in the upper portion of the.

The breather chamber 9 is attached to the head cover 2 by extending a pipe 10 to the outside through a hole 11 in the head cover 2 and bolting, caulking or resin welding. The pipe 10 is connected to the intake system 6. An O-ring 12 fitted to the pipe 10 is provided in the portion of the head cover 2 where the hole 11 is formed.

In the breather device 1 thus constructed, the breather chamber 9 obtained by integral molding is fastened to the head cover 2, so that the breather device 1 shown in FIGS. In comparison with the case where the bolt 4 for fixing the breather plate 3 and the sealant 8 are required, these can be omitted to reduce the number of parts. Further, since the bolt 4 for fixing the breather plate 3 and the sealant 8 are omitted, the assembling work is eliminated and the number of assembling steps can be reduced. There is no change in the flow of blow-by gas G.

In the breather device 1 shown in FIGS. 4 to 6, it was necessary to press-fit the pipe 7 into the hole 11 formed in the head cover 2 and weld the pipe 7, but in the present invention,
Since the pipe 10 is formed together with the breather chamber 9 and the intake system 6 is connected to this pipe 10, press-fitting and welding of the pipe 7 can be omitted, and the number of assembling steps can be further reduced. Further, in the breather device 1 shown in FIGS. 4 to 6,
Since the breather chamber 5 is formed by attaching the breather plate 3 to the head cover 2, the shape is restricted. However, in the present invention, the breather chamber 9 is formed separately from the head cover 2. , The degree of freedom in setting the shape is high.

[0012]

Since the breather chamber obtained by integrally molding is fastened to the head cover, the present invention requires the breather plate, the bolt for fixing the breather plate and the sealant which are required in the conventional breather device 1. Can be omitted, so that the number of parts can be reduced. Further, since the bolt for fixing the breather plate and the sealant are omitted, the assembling work is eliminated, so that the number of assembling steps can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a breather device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a side view showing the breather device.

FIG. 4 is a sectional view showing an example of a conventional breather device.

5 is a sectional view taken along the line BB of FIG.

FIG. 6 is a side view showing the breather device.

[Explanation of symbols]

 2 Head cover 6 Intake system 9 Breather chamber 10 Pipe

Claims (1)

[Claims] 1. A breather apparatus comprising an internal combustion engine having an intake system connected to a breather chamber, wherein a breather chamber including a pipe connected to the intake system is integrally formed, and the breather chamber is attached to a head cover.