A rotary hydraulic seal assembly for sealing a rotationally eccentric
annular gap between a rotating cam phaser element and a stationary cover.
The assembly includes a tubular sleeve disposed between the phaser and the
cover at the junctures of control oil passages in the phaser element and
the cover. Passages through the sleeve allow oil flow across the sleeve at
the junctures. Static seals disposed in grooves on the surface of the
sleeve prevent leakage between adjacent junctures. Because the sleeve is
constrained from rotating with the phaser element, the static seals are
not subjected to frictional wear. The radial thickness of the sleeve is
selected such that the rotational surface floats on a thin film of oil and
the static seals are sealingly compressed against the stationary element.
The gap filled by the film of oil is thus annular with no eccentric
runout, as the sleeve is hydraulically centered; thus, cross-talk and
leakage from the gap are minimized, and eccentricities between the
timing-chain cover and the phaser element are radially absorbed by the
static seals.
_ uno rotatorio hidráulico sello montaje para lacre uno rotationally excéntrico anular boquete entre uno rotating leva phaser elemento y uno inmóvil cubrir. _ montaje incluir uno tubular manga disponer entre phaser y cubrir en juntura control aceite paso en phaser elemento y cubrir. _ paso por manga permitir aceite fluir a través manga en juntura. _ estático sello disponer en surco en superficie manga prevenir salida entre adyacente juntura. _ porque manga ser constrained rotating con phaser elemento, estático sello ser no sujetar friccional usar. _ radial grueso manga ser seleccionar tal que rotatorio superficie flotar en uno fino película aceite y estático sello ser sealingly comprimir contra inmóvil elemento. _ boquete llenar por película aceite ser así anular sin excéntrico agotamiento, como manga ser hidráulico centrar; _ así, interferencia y salida boquete ser reducir al mínimo, y excentricidad entre sincronizacio'n-cadena cubrir y phaser elemento ser radial absorber por estático sello. _
