Device for controlling the pressure in the bearings of a roots b

Details Device for controlling the pressure in the bearings of a roots b Device for controlling the pressure in the bearings of a roots b

1986-11-20

1987-12-01

Koczo, Michael

Internal-combustion engines

Charge forming device

Supercharger

418104, F02B 3300

Patent

active

047096829

ABSTRACT:
A pressure controlling device for controlling pressure acting on end faces of bearings in a Roots blower type supercharger. An end portion of a shaft having an impeller projects through an inner wall of a housing of the supercharger, and is rotatably supported by a bearing provided outside of the inner wall. An annular space is formed the bearing and the inner wall. The annular space is communicated with the atmosphere through an air passage which is connected to a control valve. The control valve closes for a predetermined period after the engine load becomes higher than a predetermined value.

REFERENCES:
patent: 3178104 (1965-04-01), Williams et al.
patent: 4153395 (1979-05-01), O'Neill
patent: 4594992 (1986-06-01), Nakamura et al.
patent: 4657495 (1987-04-01), Sakamaki et al.

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