Abstract: A positive drive (10) utilizing a secondary clutch (76, 78, 132, 134) to frictionally couple the drive cam (22) and housing (12) to the output couplings (34, 36) regardless of engagement of the primary clutch (52, 54 and 66, 68) for preload and dampening purposes is provided. The magnitude of the torque transfer capacity of the secondary clutch between the drive cam and the faster rotating output coupling includes a fixed magnitude component supplied by a resilient biasing member (72 and 74) and a variable magnitude component which increases with increases in the magnitude of difference between torque transmitted to the slower and faster rotating wheels by the clutches associated therewith.

Abstract: A low pressure drop air flowmeter for an automotive engine is disclosed. The meter includes a main air flow passage, a relatively small venturi tube receiving a portion of the air flow, a pressure port for sensing stagnation pressure in the main passage, a pressure port for sensing static pressure in the throat of the venturi, and a set of stationary swirl vanes disposed adjacent the outlet of the venturi and operative to impart a swirl to the remainder of the air in the main passage, thereby creating a reduced pressure at the venturi outlet for amplifying the pressure difference between the stagnation and static pressures without appreciably increasing the pressure drop across the flowmeter. Also disclosed is a solenoid valve having a single valving member operative in one position to communicate the stagnation pressure to an absolute pressure transducer and operative in another position to communicate the static pressure to the transducer.