专利名称：Hydraulic vibration exciter and method of
cooling thereof
发明人：Udo Carle申请号：US06/050782申请日：19790621公开号：US04240326A公开日：19801223
摘要：A hydraulically operated vibration exciter for a vibrating compactor of the kindcomprising a piston in a cylinder, the piston and cylinder being arranged to move to andfro relative to each other, a source of liquid under pressure, a pressure line connectingthe source to the cylinder and means for causing the liquid to move to and fro betweenthe source and the cylinder to bring about the relative movement between the pistonand cylinder is cooled by a method in which, during the relative movement, a quantity ofthe liquid is withdrawn from the cylinder and this quantity is not returned to the cylinderin the subsequent stroke, but is replaced by a fresh quantity of liquid at a lower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 justdescribed is provided with a duct which leads from at least one of the end faces of thepiston to an opening in the peripheral face of the piston, and the cylinder is provided withan opening in its wall with which the opening in the peripheral face of the piston comesinto communication intermittently during the to and fro relative movement, the openingin the wall of the cylinder being connected by a liquid withdrawal line to a liquid reservoir.
申请人：KOEHRING GMBH BOMAG DIV
代理机构：Spencer & Kaye
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