JPS5930172Y2 - Installation device for exhaust turbocharger in internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for attaching an exhaust turbo supercharger to an exhaust turbo supercharged internal combustion engine.

In general, an exhaust turbo supercharger has a structure in which an exhaust turbine made of cast iron and a blower compressor made of light alloy such as aluminum are directly connected via a bearing housing, and there is considerable thermal expansion and heat in the axial direction. Because it involves contraction, when it is installed in an engine, the effects of thermal expansion and contraction will affect the connection between the exhaust turbine and the exhaust system, the connection between the blower-compressor and the intake system, and even the engine. We must make sure that it does not reach us.

The present invention supports the exhaust turbo supercharger near its center of gravity and at a location where thermal expansion and contraction are small in both directions of the exhaust turbine and blower compressor. By creating a structure that can absorb expansion and contraction, the effects of axial thermal expansion and contraction on the exhaust turbo supercharger are reduced, and the installation is designed to simplify the structure and reduce weight. .

Next, an example of the present invention will be explained with reference to the drawings. In the drawing, 1 is an internal combustion engine body, 2 is an intake manifold attached to the side of the engine body 1, and 3 is a carburetor attached to the upper surface of the intake manifold 2. 4 is an exhaust turbo supercharger, and the exhaust turbo supercharger 4 has an exhaust turbine 5 made of cast iron and a blower-compressor 6 made of light alloy directly connected by a bearing housing 7 located between them. An exhaust passage 8 from the engine is connected to the inlet 5' of the exhaust turbine 5, an exhaust discharge passage 10 to a muffler or exhaust purification device is connected to the outlet 9, and an inlet 11 of the blower-compressor 6 is connected to the exhaust gas passage 8. The carburetor 3 is connected to the intake manifold 2 through a passage 12 and an elbow pipe 13, and an outlet 14 of the blower-compressor 6 is connected to a gathering part 15 provided in the intake manifold 2. The supercharged air from the blower-compressor 6 is inserted and connected in a detachable manner so that the supercharged air from the blower-compressor 6 is taken into each cylinder of the engine from the collecting part 15 through each intake passage 16.

On the inner surface of the exhaust turbine 5 in the exhaust turbocharger 4, that is, on the side facing the blower-compressor 6, a flat plate 17 that is perpendicular to the axis of the exhaust turbocharger 4 is provided.
However, in the embodiment, when joining the bearing housing 7 to the exhaust turbine 5, the flat plate is used as a presser plate that presses the flange 7' of the bearing housing 7 against the side surface of the exhaust turbine 5. 17), the flat plate 17 is removably fastened to a component attached to the engine body 1, such as the intake manifold 2, or the engine body 1 with bolts 19. be.

As described above, the present invention supports the exhaust turbo supercharger 4 at the inner side of the exhaust turbine 5 via the flat plate 17, but the exhaust turbine 5 is generally made of cast iron, while the blower compressor Since 6 is made of light alloy, the center of gravity of the entire exhaust turbo supercharger is located near the exhaust turbine 5. Therefore, by supporting it on the inner surface of the exhaust turbine 5 as described above, the exhaust turbo supercharger is The feeder 4 is supported approximately at its center of gravity.

Therefore, since little moment acts on the flat plate 17, even if the flat plate 17 is made of a thin, lightweight material with low rigidity, it can still function satisfactorily.

Furthermore, since the exhaust turbine 5 is supported at a location on the inner surface thereof, thermal expansion and contraction in the blower-compressor 6 direction from the support location is limited to the blower-compressor 6 portion and the bearing housing 7.
It only needs to be equal to the axial length of the part, and as in the case where the exhaust turbocharger is supported on the outer surface of the exhaust turbine, the axial expansion and contraction of the exhaust turbine part is equal to the axial thermal expansion and contraction of the exhaust turbine part. Thermal expansion and contraction in either direction of the blower-compressor and exhaust turbine is small. It is attached via the flat plate 11, and since the flat plate 17 has low rigidity in the axial direction of the exhaust turbo supercharger, the difference in length due to thermal expansion and contraction in the axial direction is due to the elastic deformation of the flat plate 11. It can be absorbed.

Therefore, according to the present invention, the exhaust turbo supercharger can be mounted on the engine in a well-balanced manner, the structure of the mounting part is simple, the weight can be reduced, and the heat generated by the exhaust turbo supercharger can be reduced. Expansion and thermal contraction have the effect of reducing the effects on the exhaust turbocharger itself, the engine, or the exhaust system and intake system.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway front view, and FIG. 2 is a sectional view taken along the line 1--2 of FIG. 1... Engine body, 2... Intake manifold, 4... Exhaust turbo supercharger, 5...
・Exhaust turbine, 6...Blower compressor, 7.
...Bearing housing, 17...Flat plate.

Claims (1)

[Scope of utility model registration request] An exhaust turbo supercharger that directly connects an exhaust turbine connected to the exhaust system of the engine and a blower-compressor connected to the intake system is installed on the inner surface of the exhaust turbine in a planar shape perpendicular to the axis of the exhaust turbo supercharger. 1. A mounting device for an exhaust turbo supercharger in an internal combustion engine, comprising a flat plate attached to the engine or a part attached to the engine via the flat plate.