B - Operations – Transporting – 62 – D
Patent
B - Operations, Transporting
62
D
138/60
B62D 3/04 (2006.01) B62D 5/087 (2006.01) B62D 5/24 (2006.01)
Patent
CA 1098799
ABSTRACT An integral power steering gear assembly (10) includes a piston (11) and cylinder (13) combination having greater output efficiency through improved fluid balancing and cushioning of the piston at its ends. The improved cushioning utilizes oil capillary slots (50) fed with high pressure fluid from feed grooves (52,53) along the sides of the piston adjacent the output rack. In order to obtain the increased efficiency, the slots (50) are designed to have a shallow depth, preferably 0.001 inch - 0.0025 inch, which is sufficient to provide for high capillary attraction of the oil molecules to the slot (50). The trapped oil molecules prevent slip stick action, that is, molecular interaction between the piston (11) and cylinder wall and thus improved reversibility, but at the same time, the oil molecules remain trapped or isolated within the walls of the slot (50) thereby minimizing leakage. The operating oil is delivered with higher efficiency in the power steering unit by a bifurcated oil delivery passage (31) communi- cating with the inlet slot (22) of the piston. This provides fluidized balance and cushioning of the valve (20) within the piston, and also prevents starvation of the high pressure feed grooves (52,53) and capillary slots (50) for balancing and cushioning the piston within the cylinder. Accordingly, improved reversibility of both the piston and the valve are obtained.
326647
Meredith & Finlayson
Sheppard Peter H.
LandOfFree
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