VISCOUS ROTATIONAL SPEED CONTROL DEVICE WITH FLUID CIRCUIT

摘要

A rotational speed control device includes a housing containing a viscous fluid and a shaft disposed in the housing and rotatable relative to the housing. A rotor may be movable axially on the shaft depending on the rotating speed of the shaft. The rotor is biased in a low torque direction. A braking torque between the rotor and the housing and/or between the rotor and a drive control ring is varied according to an axial position of the rotor on the shaft. The device may incorporate bypass channels to control a circulating pressure of the viscous fluid.

主权项

1. A rotational speed control device comprising:
a housing containing a viscous fluid; a shaft disposed in the housing and rotatable relative to the housing; a rotor coupled with the shaft for rotation with the shaft relative to the housing in the viscous fluid, wherein the rotor is axially displaceable along the shaft, the rotor including an impeller that is oriented to displace the rotor axially on the shaft in a first direction with rotation of the rotor; a spring mechanism disposed in the housing and acting on the rotor, the spring mechanism biasing the rotor axially on the shaft in a second direction, opposite from the first direction; and a fluid circuit through which the viscous fluid flows as the impeller rotates with the rotor, wherein a braking torque between the rotor and the housing is varied according to an axial position of the rotor on the shaft.