V-type engine with turbocharger

Details V-type engine with turbocharger V-type engine with turbocharger

2000-03-14

2001-10-23

Nguyen, Hoang (Department: 3748)

Power plants

Fluid motor means driven by waste heat or by exhaust energy...

With supercharging means for engine

C123S053600

Reexamination Certificate

active

06305168

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to a V-type engine equipped with a turbocharger, and more particularly to such an engine having a turbocharger positioned between two banks of the engine.
2. Description of the Related Art
When a mechanical supercharging device such as a turbocharger is attached to a V-type engine, the turbocharger is often located between two banks of the engine in order to effectively use a space between the banks.
Japanese Patent Application Laid Open Publication No. 5-1564 discloses a V-type engine equipped with a mechanical supercharger situated between banks.
Because a rotor shaft rotates at a very high speed in the mechanical supercharger, it is necessary to feed an oil to bearings of the rotor shaft for lubrication and cooling. In general, an engine oil is used as this lubrication/cooling oil. A pump, oil passages/pipes and the like for recirculating the oil in the engine are also utilized to deliver the oil to the rotor shaft bearings.
Specifically, an oil conduit is branched from a cylinder block, cylinder head or other oil delivery part(s) and extends to an oil inlet of the mechanical supercharger. The oil is then caused to flow to the rotor shaft bearings.
However, if bolts for connecting the oil conduit and mechanical supercharger become loose, or the oil conduit is damaged by solid particles accidentally admitted to the oil conduit, then oil leakage may occur. The leaking oil drops to a valley between the two banks (referred to as “interbank valley”).
An oil drain is generally formed in the interbank valley so that the leakage oil is promptly discharged from the engine. In reality, however, some oil unavoidably remains in the interbank valley. For instance, the oil adheres or sticks onto the interbank valley.
In the meantime, a turbocharger (particularly its turbine and associated parts) is sometimes heated to a very high temperature such as about 700 to 800° C. during operation, and vibrations of the engine and vehicle body may cause the oil remaining on the interbank valley to spatter to the mechanical supercharger. This should be avoided.
SUMMARY OF THE INVENTION
An object of the present invention is to prevent an oil from flying to a turbocharger from a bank valley of a V-type engine.
According to one aspect of the present invention, there is provided a V-type engine having a turbocharger located between two banks, characterized in that a shield member is also provided between the turbocharger and the bottom of the interbank valley of the engine. The shield member becomes an obstacle against the oil spattered from the V bank valley so that the spattered oil cannot reach the hot parts of the turbocharger.
The shield member may be a shielding plate. The shielding plate may include a cover portion covering a lower part of the turbocharger, and a plurality of extensions erected (or bent) from the cover potion to be mounted on the engine. The cover portion may have a shallow U shape that generally conforms to the interbank valley. The cover portion may have an oil outlet to allow a leakage oil to escape from the cover portion therethrough and to drop onto the interbank valley. The oil outlet may be a cutout formed in the cover portion, with a front end of the cutout being open.
A plurality of bosses may be formed on inside (or inwardly facing) walls of the banks whereby the extensions of the cover portion are placeable on these bosses and screwed when the shielding plate is fixed to the engine. The extensions may have holes through which bolts can extend, and the bosses may have internal threads.
A plurality of fingers may extend from lateral edges of the cover portion in such a way that the fingers cover part of the inside walls of the banks.
An oil drain may be formed in the interbank valley, and leakage oil collected by the cover portion may be allowed to drop onto the interbank valley from the oil outlet of the cover portion and be subsequently discharged from the engine.
The shielding plate may also serve as a vibration damping steel plate. The vibration damping steel plate may include a pair of steel plates and a vibration damping material sandwiched between the steel plates with adhesive. The vibration damping material may be a thermoplastic viscoelastic resin. The vibration damping material may contain inorganic fibers such as ceramics, carbon and glass.


REFERENCES:
patent: 4372120 (1983-02-01), Ford, Jr. et al.
patent: 4458491 (1984-07-01), Deutschmann
patent: 5501075 (1996-03-01), Spies et al.
patent: 6021746 (2000-02-01), Pyon
patent: 5-001564 (1993-01-01), None

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