G - Physics – 01 – F
Patent
G - Physics
01
F
137/108
G01F 5/00 (2006.01) F16C 32/06 (2006.01)
Patent
CA 1086184
ABSTRACT The invention is concerned with hydrostatic bearing arrangements in which there is a fluid-flow control valve which is adapted to exercise an automatic pressure responsive control over two fluid-flow outputs to a pair of bearings. The fluid-flow control valve has a deflectable valve member located between two control surfaces so that a fluid-flow restriction is formed between the valve member and each of the two control surfaces, whereby movement of the valve member in a direction to close one of the restrictions opens the other restriction and vice versa, there being a fluid supply port opening through one of the two control surfaces into the restriction between that surface and the valve member. There may be a communicating port through the valve member and a single supply port communicating directly with one of the restrictions and communicating indirectly with the other restriction through the communicating port. As an alternative to the communicating port, the valve may have a conduit by-passing the valve member. In a preferred arrangement, a valve assembly comprises two or more fluid-flow control valves each in accordance with the invention combined in a stack, with a single inlet passage communicating with an inlet port in each of the valves. There may for example be a manifold block, the inlet passage being formed in the manifold block, and the valves being mounted on the block. The invention also comprises a hydrostatic bearing - 1 - arrangement for a machine in which there are two hydrostatic bearings and a control valve of the kind referred to, arranged so that the fluid supply to the bearings passes through respective ones of the two fluid-flow restrictions, the two bearings being mounted on the first of a pair of relatively movable members in a machine and the two bearings acting on oppositely facing surfaces of the second of the relatively movable members, the arrangement providing that if the relatively movable members tend to approach each other so as to narrow the clearance at one of the bearings and to increase it at the other bearing, the resultant increase in fluid pressure at the bearing where the clearance tends to narrow causes movement of the valve member whereby the fluid supply from the valve to the bearings is varied so as to exercise a control on the location of the second relatively movable member with respect to the first relatively movable member. - 1a -
306856
Fetherstonhaugh & Co.
Staveley Machine Tools Limited
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