JPH0133778Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an exhaust pipe coupling device for an engine.

Generally, in an engine, a flange at the tip of an exhaust pipe is fitted to the end face of an exhaust hole of the engine by sandwiching a gasket plate, and the flange is connected to the end of the exhaust hole by tightening bolts. Further, the muffler connected to the rear end of the exhaust pipe is floatingly fastened to the fuselage via an elastic piece. Therefore, the engine generates vibrations during operation, and the exhaust pipe and muffler also vibrate along with this vibration, but by connecting the muffler and the aircraft body in a floating manner as described above, the transmission of vibration to the aircraft body can be alleviated. ing. However, the tip of the exhaust pipe and the exhaust hole of the engine are tightly fastened with bolts, and stress due to vibrations concentrates on the fastened part, causing cracks and breakage of the exhaust pipe. To prevent this, a reinforcing piece must be welded to the tip of the exhaust pipe, or a strong exhaust pipe with a large wall thickness must be used, which results in inconveniences such as being expensive and heavy.

This idea is an improvement based on these points.
Embodiments of the present invention shown in the drawings will be described below.

The exhaust pipe 1 has a collar piece 2 welded to its tip. The exhaust hole 4 of the engine 3 is provided with a stepped hole 5 at its end. The tip of the exhaust pipe 1 is inserted into the step hole 5 with the gasket ring 6 attached. Cushion rings 7 made of steel wool or the like are concentrically arranged on both sides of the collar piece 2 provided on the exhaust pipe 1. Then, the bolt 9 passed through the clamp 8 passed through the exhaust pipe 1 is tightened into the screw hole 10 provided on the end face of the exhaust hole 4, and the collar piece 2 is tightened.
is held between the clamp 8 and the end face of the exhaust hole 4 via the cushion ring 7. The rear end of the exhaust pipe 1 is connected to a muffler 11, and the muffler 11 is connected to the stay 1.
Tapered elastic rings 14 are placed on both sides of the mounting holes 13 of 2, and are floatingly fastened to the body 16 with bolts 15.

During operation, the engine 3 generates vibrations, and this vibration is transmitted to the exhaust pipe 1 and the muffler 11. The tip of tube 1 can move slightly differently from engine 3,
It can absorb vibrations and relieve stress concentration. Therefore, the vibration of the muffler 11 is reduced, and the vibration transmitted to the aircraft body 16 can also be reduced.

As explained above, this idea involves welding a collar piece to the tip of the exhaust pipe, inserting the tip of the exhaust pipe with a gasket ring into the step hole at the end of the engine's exhaust hole, and
Cushion rings are arranged on both sides of the flange piece, and the flange piece is held between the clamp and the end face of the exhaust hole via the cushion ring. The tip of the exhaust pipe can be moved slightly, reducing the transmission of engine vibrations to the exhaust pipe, and reducing concentrated stress due to vibrations applied to the connecting portion of the exhaust pipe tip. For this reason,
Reinforcement of the exhaust pipe can be omitted and the cost can be reduced. Also, vibrations transmitted from the exhaust pipe to the aircraft via the muffler can be reduced. Moreover, the cushion rings arranged on both sides of the flange piece are small annular shapes with the same diameter as the flange piece, so they can be installed in the conventional mounting space using conventional mounting bolts, making it compact and without any change in appearance. Can be done. Furthermore, depending on the individual differences in the magnitude of engine vibration, it is possible to respond with or without a cushion ring while keeping the same design.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is an overall side view, Fig. 2 is an enlarged vertical cross-sectional view of the part in the direction of arrow A in Fig. 1, and Fig. 3 is an enlarged cross-sectional view of the part in the direction of arrow B in Fig. 1. It is a front view. 1... Exhaust pipe, 2... Flange piece, 3... Engine,
4... Exhaust hole, 5... Step hole, 6... Gasket ring, 7... Cushion ring, 8... Clamp.

Claims (1)

[Scope of utility model registration request] An engine exhaust pipe, in which the tip of the exhaust pipe is connected to the end face of the engine exhaust hole, and a muffler connected to the rear end of the exhaust pipe is floatingly fastened to the aircraft body via an elastic piece. In the coupling device, weld a collar piece to the tip of the exhaust pipe, insert the exhaust pipe tip with a gasket ring into the stepped hole at the end of the engine exhaust hole, and attach the collar pieces concentrically to both sides of the collar piece. An exhaust pipe connecting device for an engine, characterized in that the collar piece is sandwiched together with a cushion ring between the end face of the exhaust hole and the clamp.