JPH0645604Y2 - Blow-by gas hose piping device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a blow-by gas hose piping device, in particular, it is possible to easily obtain the installation location of the branch pipe joint and easily fix the branch pipe joint, and also the number of parts. The present invention relates to a blow-by gas hose piping device that can reduce the cost, improve the appearance of the piping structure, reduce the number of parts assembling steps, and reduce the cost.

[Conventional technology]

In an internal combustion engine, blow-by gas leaking from the combustion chamber through the gap between the piston and the cylinder wall into the crankcase is generated. This main component is an unburned gas and contains a large amount of HC, and it is necessary to lead it to the combustion chamber again and reburn it. For this, there is a blow-by gas recirculation device,
As a generally used method, as shown in FIG. 4, the negative pressure of the intake system of the internal combustion engine 2 is used to suck air into the air cleaner 8 or the intake passage 12, or both of them.
It recirculates during intake air and leads to the combustion chamber again for combustion. A PCV valve 28 is provided in the blow-by gas recirculation device in order to adjust the recirculation amount of the blow-by gas to the intake passage 12, which is the intake system.

Further, such a blow-by gas recirculation device is disclosed in, for example, Japanese Utility Model Laid-Open No. 61-194715. The one described in this publication prevents the blow-by gas from freezing by forming the branch pipe joint integrally with the PCV valve, and quickly thaws even when frozen.

[Problems to be solved by the invention]

However, in the conventional blow-by gas recirculation device,
In FIG. 4, the first branch port portion 42a of the branch pipe joint 42 is shown.
Is connected to a blow-by gas introducing hose 20 communicating with the cylinder head cover 24 of the internal combustion engine 2, and a first blow-by gas supply hose 44 connected to the PCV valve 28 is connected to the second branch port portion 42b of the branch pipe joint 42. Since the second blow-by gas supply hose 46 communicating with the air cleaner 8 is connected to the third branch port 42c,
It is difficult to obtain the installation location of the branch pipe joint 42, it is difficult to fix the branch pipe joint 42, the number of parts increases, the appearance of the piping structure deteriorates, and the number of parts assembling steps increases, and There was the inconvenience of being expensive.
Further, in the above-mentioned publication, since the PCV valve and one port portion of the branch pipe joint are integrated, the installation location of the PCV valve is restricted, the degree of freedom of installation of the PCV valve is reduced, and the installability is reduced. And the general versatility is lowered.

[Purpose of device]

Therefore, the purpose of this invention is to eliminate the above-mentioned inconveniences.
By directly connecting one port of the branch pipe joint to the air cleaner, the location of the branch pipe joint can be easily obtained, the branch pipe joint can be easily fixed, and the number of parts can be reduced. It is to realize a blow-by gas hose piping device that can improve the appearance of the piping structure, reduce the number of parts assembling steps, and be inexpensive.

[Means for solving problems]

In order to achieve this object, the present invention relates to a blow-by gas hose piping device connected to a PCV valve facing an internal combustion engine side and an intake passage through a hose with a branch pipe joint and an air cleaner upstream of the intake passage, in which the branch pipe is connected. It is characterized in that one port portion of the joint is directly connected to the air cleaner.

[Action]

According to the structure of this invention, one port of the branch pipe joint is attached to the air cleaner, and the other two ports are connected to the internal combustion engine side with a blow-by gas introduction hose and a PCV.
The blow-by gas supply hoses connected to the valves are connected respectively. This makes it easy to install the branch pipe joint, easily fix the branch pipe joint, reduce the number of parts, improve the appearance of the piping structure, and reduce the number of parts assembling steps. .

〔Example〕

Embodiments of the present invention will be described in detail and specifically below with reference to the drawings.

1 and 2 show a first embodiment of the present invention. In the figure, 2 is an internal combustion engine, 4 is a cylinder block, 6 is a cylinder head, 8 is an air cleaner, and 10 is a carburetor. The cylinder head 6 and the carburetor 10 include an intake passage.
It is constituted by an intake manifold 14 forming 12.

Blow-by gas generated in a crankcase (not shown) of the internal combustion engine 2 is recirculated to the air cleaner 8 and the intake passage 12 by a blow-by gas recirculation device 16.

This blow-by gas recirculation device 16 includes a three-way branch pipe joint 18
And a blow-by gas introduction hose 20 and a blow-by gas supply hose 22. That is, the engine side port portion 26 is mounted on the cylinder head cover 24 provided on the upper portion of the cylinder head 6, and the engine side port portion 26 and the first branch port portion 18a of the branch pipe joint 18 are connected to the blow-by gas introduction hose 20. Are linked by. In addition, the intake passage 12
Adjust the amount of blow-by gas recirculation by negative pressure in the intake pipe
Second of the valve port portion 28a of the PCV valve 28 and the branch pipe joint 18
The branch port portion 18b is a blow-by gas supply hose 22.
Are linked by. The PCV valve 28 adjusts and recirculates blow-by gas from the gas flow hole 30 formed in the intake manifold 14 into the intake passage 12.

On the other hand, the third port portion 18c of the branch pipe joint 18 is formed so as to extend toward the air cleaner 8 side and is directly connected to the air cleaner 8 and firmly attached thereto.

Next, the operation of this embodiment will be described.

The blow-by gas that has flowed into the cylinder head cover 24 from the crank case of the internal combustion engine 2 is guided by the blow-by gas introduction hose 20 and reaches the branch pipe joint 18, where it is divided into two, one of which is a blow-by gas supply hose. twenty two
It is guided to the PCV valve 28 and adjusted by the gas flow hole 30.
And the other is supplied to the air cleaner 8 through the extended third branch port portion 18c.

Therefore, according to the first embodiment, the third branch port portion 18c, which is one of the branch pipe joints 18, is extended and directly connected to the air cleaner 8, so that the installation place of the branch pipe joints 18 can be easily performed. In addition, the branch pipe joint 18 can be simply and firmly fixed to the air cleaner 8, and the second blow-by gas supply hose 46 is not required on the side of the air cleaner 8 as in the conventional case.
The number of parts can be reduced, the appearance of the piping structure can be improved, the number of assembly steps of parts can be reduced, and the cost can be reduced.

In addition, by connecting the PCV valve 28 and the branch pipe joint 18 with the blow-by gas supply pipe 22, the PCV valve 28 can be installed at a desired position, increasing the degree of freedom of installation of the PCV valve 28 and improving the installation property. Can be improved and versatility can be enhanced.

FIG. 3 shows a second embodiment of the present invention. In the following embodiments, the portions having the same functions as those of the above-described first embodiment will be described with the same reference numerals.

The features of the second embodiment are as follows. That is, when the branch pipe joint 18 is attached to the air cleaner 8, for example, the metal branch pipe joint 18 is cast into the resin air cleaner 8 and the third branch port portion 18c, which is the cast portion of the branch pipe joint 18, is inserted. It was formed with a bending angle α. That is, the third branch port portion 18c of the branch pipe joint 18
The center line C is bent by a bending angle α with respect to the horizontal line H and is press-fitted into the air cleaner 8.

According to the configuration of the second embodiment, conventionally, as shown in FIG. 5, when the air cleaner 8 and the branch pipe joint 52 are integrally molded, the outer diameter of the third branch port portion 52c of the branch pipe joint 52 is set to If you specify, due to the relationship between the wall thickness t of resin molding and distribution
The inner diameter D _{1 of} the third branch port portion 52c becomes smaller than the inner diameter D _{2 of} the first branch port portion 52a, the mold of the air cleaner 8 becomes complicated, and if the inner diameter of each port portion is small, manufacturing becomes difficult. There was an inconvenience. Further, conventionally, as shown in FIG. 6, a metal branch pipe joint is attached to the air cleaner 8.
When the third branch port portion 54c of 54 is press-fitted into the press-fitting hole portion 56, the third branch port portion 54C is easily pulled out, and the T-shaped branch pipe joint 54 needs to be positioned.
There is a disadvantage that the branch port portion 54C easily rotates in the rotation direction.

Therefore, according to the second embodiment, as shown in FIG.
If the third branch port portion 18c of the branch pipe joint 18 has a bending angle α and the metal branch pipe joint 18 is press-fitted into the air cleaner 8, the third branch port portion 18c may be withdrawn or rotated. It can be surely prevented and is practically advantageous.

[Effect of device]

As is clear from the above detailed description, according to the present invention,
By directly connecting one port of the branch pipe joint to the air cleaner, the location of the branch pipe joint can be easily obtained, the branch pipe joint can be easily fixed, and the number of parts can be reduced. The appearance of the structure can be improved, the man-hours for assembling the parts can be reduced, and the cost can be reduced.

[Brief description of drawings]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a schematic view of a blow-by gas hose piping device, and FIG. 2 is a perspective view of an air cleaner to which a branch pipe joint is attached. FIG. 3 shows a second embodiment of the present invention and is an explanatory view of a portion where a branch pipe joint is attached to an air cleaner. FIGS. 4 to 6 show a conventional blow-by gas hose piping device, FIG. 4 is a schematic view of the device, FIG. 5 is an enlarged view of a main part when an air cleaner and a branch pipe joint are integrally molded, and FIG. FIG. 6 is an enlarged view of a main part of the pipe joint in which the pipe joint is press-fitted and attached to an air cleaner. In the figure, 2 is an internal combustion engine, 8 is an air cleaner, 12 is an intake passage, 16 is a blow-by gas recirculation device, 18 is a branch pipe joint, 20 is a blow-by gas introduction hose, 22 is a blow-by gas supply hose, and 28 is a PCV. It is a valve.

Claims (1)

[Scope of utility model registration request] 1. A blow-by gas hose piping device connected to a PCV valve facing an internal combustion engine side and an intake passage through a hose with a branch pipe joint and an air cleaner upstream of the intake passage, and one port portion of the branch pipe joint. A blow-by gas hose piping device, wherein the blow-by gas hose piping device is directly connected to the air cleaner.