JPS597544Y2 - turbo compound engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanically driven supercharged turbo compound engine.

A mechanically driven supercharger installed to increase engine output is driven by the engine's output shaft, so torsional vibration of the output shaft deteriorates the durability of the supercharger body and power transmission system such as gears. There is a fear.

In particular, screw-type and roots-type superchargers require highly accurate gears to precisely match the timing of the two rotors, and the above-mentioned adverse effects caused by torsional vibration are significant.

Turbo compound engines use a power recovery turbine to recover exhaust energy, but since this power transmission system is equipped with high-speed bearings and high-speed gears, various problems can occur due to torsional vibrations generated in the engine, as mentioned above. The present invention was developed in view of the above circumstances, and its purpose is to provide a turbo compound engine equipped with a mechanically driven supercharger and a power recuperation turbine by using only one fluid coupling. To provide a turbo compound engine in which torsional vibration of the engine is prevented from being transmitted to a mechanically driven supercharger and a power recovery turbine.

Embodiments of the present invention will be described below with reference to the drawings.

A piston 3 is fitted into a cylinder 2 of an engine body 1 so as to be movable up and down to form a combustion chamber 4, and the piston 3 is connected to a crankshaft 5 via a connecting rod 6.

Reference numeral 7 denotes a mechanically driven supercharger, which forces atmospheric air into the combustion chamber 4 through an intake port 9 that is opened and closed by an intake valve 8.

A gear 11 is fixed to the rotating shaft 10 of the mechanically driven supercharger 7, and the gear 11 meshes with a first gear 13 provided on the intermediate shaft 12, and the intermediate shaft 12 is connected to the fluid coupling 14. , are connected to the crankshaft 5 via gears 15, 16, and 17.

A power recovery turbine 18 is driven by exhaust gas from an exhaust port 20 that is opened and closed by an exhaust valve 19, and a gear 22 provided on its rotating shaft 21 is connected to a second gear 23 provided on the intermediate shaft 12. They mesh and are rotationally driven by the engine's crankshaft 5.

Therefore, the torsional vibration of the engine crankshaft 5 is absorbed by the fluid coupling 14 and is not transmitted to the intermediate shaft 12.

Therefore, the torsional vibration of the engine is not transmitted to the mechanically driven supercharger 7 and the power recuperation turbine 18, and the durability can be improved without adversely affecting each part.

As described above, the present invention can prevent engine torsional vibrations from being transmitted to the mechanically driven supercharger 7 and power recovery turbine 18 through a single fluid coupling 14, thereby ensuring durability without adversely affecting each part. can be improved.

[Brief explanation of drawings]

The drawings are schematic diagrams illustrating an embodiment of the present invention. 1 is an engine body, 5 is an output shaft (crankshaft), 7 is a mechanically driven supercharger, 14 is a fluid coupling, and 18 is a power recovery turbine.

Claims (1)

[Scope of utility model registration request] A mechanically driven supercharger 7 and a power recovery turbine 18 are each connected to an intermediate shaft 12 by a power transmission system, and the intermediate shaft 12 is connected to an output shaft 5 of the engine via a fluid coupling 14. Turbo compound engine.