B - Operations – Transporting – 62 – D
Patent
B - Operations, Transporting
62
D
B62D 5/083 (2006.01)
Patent
CA 2172018
A valve (10) for controlling flow of hydraulic fluid. The valve (10) includes first and second valve members (80, 82), each having a plurality of lands and grooves. The valve members (80, 82) are relatively movable from a neutral position to a displaced position in which surface segments (202, 226, 208, 218) of respective pairs of lands overlap to form flow gaps (232, 234) for restricting flow of fluid between respective pairs of grooves. At least one (234) of the flow gaps is divergent by having a cross-sectional flow area which increases along a direction of fluid flow therethrough and at least one (232) of the flow gaps is convergent by having a cross-sectional flow area which decreases along a direction of fluid flow therethrough. The flow gaps (232, 234) have minimum cross-sectional flow areas (A, B) defined by the surface segments. The flow gaps (232, 234) are sized such that the minimum cross-sectional area (A) of the convergent flow gap (232) is larger than the minimum cross-sectional area (B) of the divergent flow gap (234) at a first rotational position, and are sized such that the minimum cross-sectional area (A) of the convergent flow gap (232) is smaller than the minimum cross-sectional area (B) of the divergent flow gap (234) at a second rotational position for suppressing valve noise.
Cette invention concerne une soupape de régulation de débit de liquide hydraulique (10), constituée d'un premier et d'un deuxième éléments (80, 82) comportant chacun plusieurs rainures séparées par des plats. Les éléments (80, 82) peuvent se déplacer de la position neutre à une position où les surfaces des plats correspondants (202, 226, 208, 218) coïncident, de manière que les rainures correspondantes définissent des canaux (232, 234) pour le passage du liquide. Au moins un des canaux ainsi définis (234) est divergent, la section du canal augmentant dans le sens de l'écoulement, et au moins un des canaux (232) est convergent, la section du canal diminuant dans le sens de l'écoulement. Les canaux (232, 234) ont une section minimale (A, B) définie par la position des plats. La section minimale (A) du canal convergent (232) est plus grande que la section minimale (B) du canal divergent (234) dans une première position, et plus petite que la section minimale (B) du canal divergent (234) dans une deuxième position pour réduire le bruit de la soupape.
Gilbert Wendell L.
Menyhart Lisa R.
Fetherstonhaugh & Co.
Trw Inc.
LandOfFree
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