The Texas A&M University System

Other

John M Vance

Richard R Shultz

Luis A San Andres

A damper seal and method of sealing and damping a rotating shaft are disclosed. The damper seal includes a stator housing, a plurality of cavities, a first modulator for modulating the fluid flow into the cavities, and a second modulator for modulating the fluid flow exiting the cavities less than the fluid flow entering the cavities to provide improved damping and sealing.

Modulated pressure damper seals

A damper seal (310) and method of sealing and damping a rotating shaft (312) are disclosed. The damper seal (310) includes a stator housing (314), a plurality of cavities (C.sub.1, C.sub.2, C.sub.3, C.sub.4), a first sealing blade (316) for modulating the fluid flow into the cavities, and a second sealing blade (318) with notches (330) and/or holes (340) for modulating the fluid flow exiting the cavities (C.sub.1, C.sub.2, C.sub.3, C.sub.4) less than the fluid flow entering the cavities (C.sub.1, C.sub.2, C.sub.3, C.sub.4) to provide improved damping and sealing.

Modulated pressure damper seal

A damper seal (10) and method of sealing and damping a rotating shaft (12) is provided with a stator housing (14) and at least two sealing blades, an upstream sealing blade (16) and a downstream sealing blade (18). There are at least two partitioning walls (20) disposed between the sealing blades (16,18) and attached to the stator housing (14). The clearance between the downstream sealing blade (18) and the shaft (12) is greater than the clearance between the upstream sealing blade (16) and the shaft (12). The damper seal (10) restricts the flow of fluid from regions along the shaft that are at different pressures and damps vibratory or whirl motion of the shaft.

Pressure damper diverging labyrinth seals with circumferential

An aircraft engine rotor system is provided with a squeeze film damper mechanism that allows axial flow of lubricant in a squeeze film region without creating a gross circumferential distortion of pressure around the damper journal. The outer race of a rolling-element bearing assembly which assembly is disposed in a journal bearing enclosure, is provided with a number of encircling annular slots, these slots providing space for reception of a spaced pair of serrated rings which are fixed to an inner wall surface of the journal bearing enclosure, the serrated peripheries of the rings being in contact with the bearing journal enclosure inner wall space. Oil enters the squeeze film region through the serrations in one of the rings and outflows through those in the other ring. The outer race of the rolling-element bearing assembly preferably is pinned or otherwise prevented from rotating so that it will orbit in translating movement in the same manner as the rotor shaft which is received in the inner race companion to the outer race. During orbiting movement of the assembly, the fixed position rings are unaffected by that movement since the outer race continuous slots are deep enough to allow the assembly to orbitally move relative to the fixed rings (alternatively, the deep slots could be in the bearing assembly with the rings fixed to the journal). The rings can have less clearance in the slots than conventional rings and this contributes to maintanance of large pressures in the squeeze film region since oil flow from one end of the squeeze film region to the other is not around the rings whereat pressure distortions can occur, but rather through the serrations.

Aircraft engine rotor squeeze film damper

A power assisted pedicycle. The present invention is directed to a power assisted pedicycle such as a bicycle or tricycle. The power assisted pedicycle has a power package having a housing having therein an engine directly driving a propeller which provides motive force. A throttle control cable extends from the engine to a point on the pedicycle at which it may be conveniently adjusted.

Growing community of inventors

Bryan, TX, United States of America

John M Vance