JPS5933897Y2 - Air cleaner connecting pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a plastic connecting pipe that connects a carburetor to a plastic rectangular air cleaner that is integrated with a valve rocker cover of an automobile engine.

The mounting methods for air cleaners for passenger cars are broadly divided into engine mount types, which are mounted directly to the carburetor, and chassis mount types, which are mounted somewhere other than the engine.

Typically, engine-mounted air cleaners are made of iron, have a round casing, and a single long, slender suction pipe, which is often directly fixed to the circular carburetor.

Also, the Jassy-qt) 7 type is made of plastic and has a rectangular air cleaner installed in a location other than the engine, and a connecting pipe is connected to the intake pipe to form the intake system, but in any of the above cases However, there are some things that cannot be said to be sufficient in terms of weight reduction for fuel consumption agreement or cost.

For this purpose, a plastic square air cleaner is being considered in which the valve rocker cover is integrally formed as part of the casing of the square air cleaner, a square over-element is built in, and the valve rocker cover is connected to the carburetor through a connecting pipe. .

1 and 2 are the above-mentioned schematic explanatory diagrams, in which the valve rocker cover 2 of the engine 1 is made of plastic, for example, to reduce weight, and the rectangular body 4 including the intake pipe 3 is integrated with the pulp rocker cover 2. The cover 5, the bellows tube 7, and the connecting tube 10 are connected to a vaporizer 8.
The carburetor 8 is further connected to an intake pipe 9 to form an intake system.

In this case, if the connecting pipe 10 is made of plastic, it will be difficult to resist vibrations caused by engine vibration and intake pulsation, and to counteract chatter noise, so conventional measures as shown in FIG. 4 have been taken.

That is, the straight pipe part 11' having a long sword-shaped cross section has upper and lower surfaces 13' and 14' in the longitudinal direction, and side parts 15' in the transverse direction.
15', and convex ribs 17', 1B' are provided on the outer surfaces of the upper and lower surface parts 13', 14' in parallel with the side parts 15', 16'.
A plurality of (two in this example) are provided.

However, in order to make a plastic connecting pipe have the same vibration resistance as a steel plate connecting pipe, it needs to be 5 to 7 times as thick as a steel plate, but it is usually 3 to 4 times thicker than a steel plate due to forming, economical considerations, etc. In addition, the suction air flowing in from the bellows head 7 changes its flow almost at right angles and is sucked into the carburetor 8, so that the air inside the straight pipe section 11' is It has the disadvantage of causing turbulence and increasing resistance.

The present invention is intended to solve the above-mentioned drawbacks, and is made by attaching a plurality of thin ribs to the straight pipe part of the plastic connecting pipe, which has a rectangular cross section, with a vertical surface and a straight line toward the mounting part. Embodiments will be described below with reference to the drawings.

. The plastic connecting pipe 10 shown in FIG. 3 is according to the present invention, and a straight pipe part 11 having a rectangular cross section and a cylindrical mounting part 12 are curved and communicate with each other at approximately right angles.

And between the lower surface 14 of the upper surface 13 of the straight pipe portion 11, the side portion 1
A plurality of (two in this example) lips 17 and 18, which are parallel to surfaces 5 and 16, are formed in a straight line toward the mounting portion 12.

The straight pipe part 11 of the connecting pipe 10 is connected to the bellows pipe 7 and the mounting part 12.
are fixed to the carburetor 8, and in order to withstand the severest vertical vibrations of the engine, multiple lips installed vertically on the straight pipe section 11 prevent chattering noise even if the plastic wall is thin. can be completely prevented.

Furthermore, the lip causes the intake air flowing in from the bellows tube 7 side to be laminarized.

As mentioned above, the present invention is made of plastic and has a straight pipe section with a rectangular cross section, in which a plurality of thin loops are formed with vertical surfaces and straight lines toward the mounting section. This prevents chattering noise caused by engine vibration and intake pulsation, and the flow of intake air becomes laminar without increasing ventilation resistance.

Furthermore, by partitioning with ribs, the cross-sectional area relative to the length becomes smaller and noise is attenuated, which has the effect of reducing the weight and cost of the intake system, including the valve rocker cover.

[Brief explanation of the drawing]

1 and 2 are front and plan views for schematic explanation of the present invention, FIG. 3 is a perspective view of a connecting pipe of the present invention, and FIG. 4 is a perspective view of a connecting pipe of a conventional embodiment. 2... Valve rocker cover, 3... Intake pipe, 4... Body, 7... Bellows part, 8
... Carburizer, 10... Connecting pipe, 11.
... Straight pipe section, 12 ... Mounting section, 17.1
8, 17', 18'...Rep.

Claims (1)

[Scope of utility model registration request] A plastic connecting pipe connects the carburetor to the plastic rectangular air cleaner that is integrally provided above the valve rocker cover. A connecting pipe of an air cleaner, which is curved and connected at a substantially right angle, and has a plurality of thin lips formed in the rectangular straight pipe portion, which form a surface in the vertical direction and extend in a straight line to the force of the mounting part. .