B - Operations – Transporting – 25 – D
Patent
B - Operations, Transporting
25
D
138/40.11
B25D 9/12 (2006.01) B06B 1/18 (2006.01) F01B 11/06 (2006.01) F01P 3/00 (2006.01)
Patent
CA 1060310
"Hydraulic Vibration Exciter and Method of Cooling Thereof" ABSTRACT OF THE DISCLOSURE A hydraulically operated vibration exciter for a vibrating compactor of the kind comprising a piston in a cylinder, the piston and cylinder being arranged to move to and fro relative to each other, a source of liquid under pressure, a pressure line connecting the source to the cylinder and means for causing the liquid to move to and fro between the source and the cylinder to bring about the relative movement between the piston and the cylinder is cooled by a method in which, in each stroke of the relative movement, a quantity of the liquid is withdrawn from the cylinder and this quantity is not returned to the cylinder in the subsequent stroke, but is replaced by a fresh quantity of liquid at a lower temperature. To enable this cooling method to be carried out, an exciter of the kind just described is provided with a duct which leads from at least one of the end faces of the piston to an opening in the peripheral face of the piston, and the cylinder is provided with an opening in its wall with which the opening in the peripheral face of the piston comes into communication intermittently during the to and fro relative movement, the opening in the wall of the cylinder being connected by a liquid withdrawal line to a liquid reservoir. - 1 -
270950
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