Supercharger of an internal combustion engine having roots pump

Patent · Tue Jun 17 04:00:00 EDT 1986

OSTI ID:5461926

Nakamura, N; Ohnaka, H

A supercharger of an internal combustion engine is described having a Roots-type pump: a pump housing for defining therein a pump chamber having an inner wall and an air inlet and air outlet; a pair of rotor shafts mounted in parallel and each rotatably supported in the housing by means of a pair of bearings, the rotor shafts respectively rigidly carrying rotors in such a manner that small clearances are defined between the pair of rotors, and between the rotors and the inner wall of the housing chamber; means for rotating the pair of rotors synchronously in opposite directions so as to suck air from the air inlet into the pump chamber and discharge the air from the pump chamber through the air outlet; each of the rotors having, at respective axial ends thereof, end faces substantially perpendicular to the rotor shaft; the housing defining annular spaces around the rotor shafts and between the axial end faces of the rotors and the bearings; and air passage means for connecting the annular spaces in the housing to the atmosphere, the passage means having a valve for controlling the air passage means in accordance with the engine driving conditions.

• Assignee: Toyota Jidosha Kabushiki Kaisha, Aichi
• Patent Number(s): US 4595992
• OSTI ID: 5461926
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
AIR FLOW
ANNULAR SPACE
BEARINGS
COMPRESSORS
CONFIGURATION
CONTROL EQUIPMENT
DESIGN
ENGINES
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
GAS FLOW
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
MOTION
PUMPS
ROTATION
ROTORS
SHAFTS
SPACE
SUPERCHARGERS
VALVES
WALLS