B - Operations – Transporting – 61 – B
Patent
B - Operations, Transporting
61
B
104/48, 137/77
B61B 1/00 (2006.01)
Patent
CA 1076921
Abstract of the Disclosure The present invention relates to hydraulic apparatus as used in a railway classification yard having hydraulically operated retarders installed at selected positions along the classification track system. The apparatus includes a plurality of motor-driven pumps at least one being normally active and another one being normally inactive, serving as a reserve pump. Each pump is provided with a filter unit through which the pump moves fluid under pressure. The pressure drop across each filter may be sensed and the reserve pump may be activated if the pressure drop exceeds a predetermined value indicating unacceptable filter efficiency, the normally active pump being deactivated A signal may be generated when the sensed pressure drop indicates that the filter in question is approaching unacceptable efficiency or that the flow rate of the associated pump is unacceptable. Thus the invention provides a redundant arrangement of pumps and filters and provides for constant performance monitoring to detect both failing and failure conditions in terms of pump and filter efficiency, enabling remedial action to be timely applied.
332925
Frank Earl E.
Yee Bing S.
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