JPH03202669A - Suction device of car engine - Google Patents

Abstract

PURPOSE:To connect the suction duct of an engine simply and certainly with an extension duct for the atmosphere by making this connection of two ducts through a cylinder, which consists of an elastic material and is provided on the peripheral surface with a plurality of flare-shaped parts in small wall thickness. CONSTITUTION:One end of a suction duct 8 whose other end is leading to the air cleaner of a car engine is connected with one end of an extension duct 10, whose other end opens to the atmosphere, through a cylindrical member 11 made of an elastic material. At the ends of the peripheral surface, this cylindrical member 11 is provided with a plurality of flare-shaped parts in small wall thickness 11b, and also in the central part with a higher small wall thickness part 11c. The two ducts 8, 10 are fitted to the small wall thickness parts 11b at both ends until they contact the small wall thickness part 11c in the center. Thereby the small wall thickness parts 11b at the ends are put in tight contact with the inner surfaces of the ducts 8, 10, and their connection can simply and certainly be made even though their relative positions are in eccentricity.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an intake system for a vehicle engine for connecting an intake system of the engine to a duct portion.

(Prior Art) An air cleaner is provided in the intake system of an engine to remove dust from the intake system. There is also a structure in which a duct is attached to the intake port of the air cleaner to reduce intake noise. Japanese Utility Model Publication No. 63-13055 discloses a technique in which an air cleaner inlet and a duct are connected by a bellows. Furthermore, Japanese Utility Model Publication No. 1-10550 discloses that a duct whose discharge direction can be varied is attached to a discharge port in the engine floor. By the way, when extending the duct, as shown in Fig. 5, one duct 1a is fitted into the duct lb which passes through the duct la, and the outer side is tightened and connected with the tightening band 2, and the piping of the duct t is There are some that extend the distance, and as shown in Figure 6,
The fitting parts 3 (3a, 3b) are connected to each other's ducts Ia and lb.
A type that is formed and fitted is also used.

(Problem to be Solved by the Invention) However, in order to join two ducts with the tightening band 2, there are restrictions on the attachment location, and the attachment work is difficult in a narrow location and requires a lot of time. Furthermore, since they are closely mounted to prevent air leakage, vibration propagation from the engine also increases. In the duct shown in FIG. 6, if the fitting is too tight, vibration propagation will increase, and if the fitting is too loose, the airtightness will deteriorate. Furthermore, if the installation positions of the two ducts are misaligned, the joint condition will deteriorate, resulting in poor installation (and loud noises).For this reason, it is desirable to have something that allows piping work to be performed more easily and more reliably. It was rare.

The present invention was made in order to meet this demand,
An object of the present invention is to provide an intake device for a vehicle engine in which a duct is connected to the intake system of the engine.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a connection cylindrical body 11 formed with a plurality of pleated thin-walled parts ttb on the outer circumferential surface of an elastic member. One end of the cylindrical body 11 is fitted into the duct 8 from the engine intake port, and the other end is fitted into the extension duct 10 to connect both ducts 8. It is characterized by connecting 0.

(Function) With the above configuration, two ducts 8. The connecting cylindrical body 11 fitted into the 1O is deformed along the mounting position of the duct 8.10, and the plurality of pleated thin walled portions 11b of the cylindrical body 11 are connected to the two ducts 8.10. The thin wall portion 11b and the duct 8 are connected to the inner peripheral surface of the IO without a gap, so that external air can be sent to the intake port of the engine.

(Example) Next, an example of the present invention will be described based on FIGS. 1 and 4. As shown in FIG. 2, an air cleaner 6 installed in the intake system of an engine 5 is installed in the engine room 4 of the vehicle, and the intake port of the air cleaner 6 is connected via a bellows 7 to a duct 8 fixed to the vehicle body. has been done. Also,
The duct IO fixed inside the fender 9 is connected to the duct 8 inside the engine room 4 via a connecting cylindrical body 11 formed of an elastic member.

As shown in FIG. 4, the connecting cylindrical body 11 (one side outer circumferential surface is shown) has a cylindrical portion 11a formed within the thickness, and a plurality of pleated thin portions 11b formed in an annular shape on the outer circumferential surface. . In the center of the connecting cylindrical body 11, there is a thin walled part 11c which is taller than the other parts.
The length 2 from the end of the connecting cylindrical body 11 to this thin part lie is the length to fit into the ducts 8 and 10, and this thin part 11c serves as a stopper. Further, in the embodiment, the duct 8.10 into which the connecting cylindrical body II is fitted forms a fitting portion 8a, ]Oa with an enlarged diameter, and the inner diameter d of the connecting cylindrical body II is the duct 8.10. The inner diameter of the duct 8 is made almost the same as the inner diameter d+ of the IO. The inner circumferential surface of the IQ is constructed to be flush with the inner circumferential surface of the fitted cylindrical body 11, and the length e of the fitting portion 8a and IOa is longer than the fitted length C of the cylindrical body 11. It has been lengthened. Further, the height h of the inserted thin wall NXl l b is equal to the fitting part 8a of the duct 8.10.

It is larger than the inner diameter enlarged portion h1 of 10a. In the embodiment, the thin wall portion llc at the center is approximately twice the length of the other thin wall portions 11b.

The method for connecting the two ducts is to fit the cylindrical body 11 into one fixed duct 8 (or duct 10), and then fit the other duct 10 (or duct 8) into the cylindrical body 11. The lever duct 10 is fixed.

As shown in FIG. 1, the duct 8.10 is secured by screwing into a threaded hole in the mounting portion 12 (one side shown).

A cylindrical body 11 is fitted into both fitting parts 8a and 10a, and the plurality of thin parts 11b are deformed along the insertion direction and are crimped onto the inner peripheral surface of the fitting part. When the distance between the ducts 8 and 10 is long, the end of the fitting part 8a is separated from the thin part 11c (distance S) and the sealed state is not affected.

Further, as shown in FIG. 3, when the distance between the ducts 8 and 10 is short, the end of the fitting portion 8a comes into pressure contact with the thin wall portion lie. Note that although the thin wall portion 11c is illustrated with only one side bent extremely, the cylindrical body 11 is placed at a position where the force distribution is even.
moves and stays there, absorbing misalignment.

The cylindrical part of the cylindrical body 11 is thick so that it will not be crushed by negative pressure, and since it is formed symmetrically from front to back, it can be connected simply by fitting into the duct regardless of the suction direction, resulting in good workability. Further, it is suitable to use a cylindrical body for piping connections that require airtightness.

Then, connect the ducts with the cylindrical body like this.

When the engine starts to intake air, the thin wall portion 11b has resistance against the intake direction, improving the sealing degree, and
Since only this thin wall portion 11b is in contact with the duct, the transmission of vibration and noise is reduced.

(Effects of the Invention) Since the present invention is constructed as described above, the ducts can be connected even if their mounting positions are shifted, and the thin wall portion is in pressure contact with the inner peripheral surface of the duct to ensure airtightness. The workability is good because all you have to do is fit the cylindrical body into the duct. In addition, the propagation of vibration can be reduced simply by contacting the thin wall portion with the duct.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a duct connection part of an embodiment according to the present invention;
Fig. 2 is an explanatory diagram of the whole according to the embodiment, Fig. 3 is a side view showing the installation state according to the embodiment, Fig. 4 is an explanatory diagram showing the relationship between the cylindrical body, the duct and the size, and Fig. 5 is the conventional FIG. 6 is a perspective view showing a duct connection method, and FIG. 6 is a sectional view showing another conventional connection method. 8...Duct lO...Extension duct 11...Cylindrical body 1st Figure 2 ■...Thin walled part

Claims (1)

[Claims] (1) A connecting cylindrical body with a plurality of pleated thin-walled parts formed on the outer peripheral surface is made of an elastic material, one end of the connecting cylindrical body is fitted into a duct from the engine intake port, and the other end is fitted into a duct from the engine intake port. An intake system for a vehicle engine, characterized in that the duct is inserted into an extension duct and both ducts are connected.