JPS6217673Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a connection device for pipes or ducts that are arranged orthogonally to each other, such as in the case of an intake pipe of a turbocharger in an automobile engine and an intake duct connected to an air cleaner. It is.

In this kind of conventional connection device, a flexible tube having a bellows shape and having a coil spring embedded therein is bent and fitted into and fixed to a predetermined duct arranged in an intersecting manner. A flexible tube formed into a bellows-like shape by sandwiching a rubberized cloth and a coil spring in the shape of a sandwich has poor workability because it is installed in a curved manner, and there is also a limit to the degree of curvature. be. Furthermore, when subjected to vibrations such as in an engine intake duct, the rubberized cloth sandwiching the coil spring may peel off due to vibration fatigue.

On the other hand, it is conceivable to form a flexible tube in which a coil spring is embedded in advance into a curved state, but this method is difficult to mass-produce compared to a straight tube, and is expensive.

Therefore, the purpose of this invention is to form a tube made of rubber or other material into a curved state in advance, and then combine it with a coil spring that maintains the shape of the tube, thereby improving productivity and assembly work compared to conventional methods. To provide a connecting device such as an intake duct which is excellent in performance and low in cost.

For this reason, the configuration of the present invention is such that a connecting device for ducts arranged perpendicularly to each other has pipe parts at both ends whose central axes are perpendicular to each other, and a flexible pipe made of rubber or the like curved in an arc shape in the middle part. The flexible tube has a bellows-like intermediate portion, a coil spring is inserted and engaged inside the flexible tube, and both ends of the coil spring have a radius of curvature that is approximately the same as the portion of the tube with a small radius of curvature. A locking member made of a curved strip plate is locked.

To explain the present invention based on an example, as shown in FIG. It is formed to be curved in an arc shape as a whole, and one end has a somewhat smaller diameter from the stepped portion 7 to form a connecting pipe portion 5, and in the case of an engine, it is used as an inlet pipe of a turbocharger. 6 and fixed with a known band or the like. The other end of the tube 8 has a larger diameter than the tube portion 5, and forms a tube portion 3 whose central axis intersects with the tube portion 5 at a predetermined angle. Then, it is fitted onto the intake duct 2 and fixed by the same means as in the case of the pipe section 5.

A coil spring 9 is fitted inside the tube 8 so that the tube 8 always maintains its cylindrical shape. One end 9a of this coil spring 9 abuts against the step 7 described above, and the other end 9b is held down by a locking member 12. That is, the locking member 12 is connected to the tube 8
It is arranged at the part with the smallest radius of curvature, and is made of a band-shaped metal plate curved to the radius of curvature, and the locking piece 12a at one end is bent and locked to the end 9a of the spring 9. At the same time, the locking piece 12b at the other end is bent and locked to the end 9b of the spring 9.

When actually installing, after fitting and fixing the tube 8 to the inlet pipe 6, the locking piece 12a of the locking member 12 connected to the end 9a of the spring 9 is inserted into the tube 8 in advance. , press the end 9a against the step 7 of the tube 8. Then, the locking piece 12b of the locking member 12 is locked to the end 9b of the spring 9. Finally, the pipe portion 3 is fitted and fixed to the intake duct 2.

Since the present invention is constructed as described above, a tube made of rubber or the like is prepared in advance so that the axes of the tube portions 3 and 5 at both ends are perpendicular or intersect at a predetermined angle, and the middle portion is bellows-shaped and curved. Since it is molded, it is easy to manufacture and has a flexible tube8.
It is easy to assemble the coil spring, which maintains the shape of the tube, by simply inserting it inside the tube. Furthermore, compared to the conventional case where straight flexible tubes are bent and connected, it is easier to bend the tubes, so it is easier to assemble. Furthermore, even if the inside of the tube 8 becomes negative pressure, the spring 9 can prevent the tube 8 from becoming flat.
An excellent effect can be obtained in that air can be introduced smoothly.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a connecting device such as an intake duct according to the present invention, and FIG. 2 is an enlarged view of the main part thereof. 2: Intake duct, 3, 5: Pipe section, 4: Bent section,
6: inlet pipe, 7: step, 8: tube, 9: coil spring, 12: locking member, 12a, 12b: locking piece.

Claims (1)

[Scope of utility model registration request] In a connecting device for ducts that are arranged orthogonally to each other, a flexible tube made of rubber or the like is used, which has tube parts at both ends whose central axes are orthogonal to each other, and whose middle part is curved in an arc shape. A coiled spring is inserted into and engaged with the inside of the flexible tube, and each end of the coiled spring has a band plate curved to a radius of curvature that is approximately the same as a portion of the tube with a smaller radius of curvature. A connecting device for a duct or the like, characterized by a locking member.