Hydraulic control circuit arrangement for a single

专利名称：Hydraulic control circuit arrangement for a

single-acting cylinder

发明人：Ohta, Shuji, c/o K.K. Toyoda Jidoshokki

Seisakusho,Takeuchi, Toshiyuki, c/o K.K.Toyoda Jidoshokki

申请号：EP90106277.8申请日：19900402公开号：EP0391307A1公开日：19901010

专利附图：

摘要：A hydraulic control circuit arrangement for a single-acting cylinder (20) provided

with bottom and rod chambers (20a, 20b) separated by a piston having a piston rodextending the rod chamber, the arrangement including a directional control valve (1) forcontrolling a supply of an operating oil from a hydraulic pump to the bottom chamber(20a) and an evacuation of the operating oil from both the bottom and rod chambers(20a, 20b), a first pilot-operated valve (13) for controlling the type of operation of thesingle-acting cylinder from a ram type to a piston type, and vice versa, in response to achange in an extent of a load applied to the single-acting cylinder during the liftingthereof, a short-circuiting conduit (23) arranged between the bottom and rod chambersof the cylinder to short-circuit a flow of the operating oil from the bottom to rodchamber, and vice versa, a second pilot-operated valve (24) located in the short-circuitingconduit (23) to control the short-circuiting of the flow of operating oil, and a flow controlvalve (22) for generating a pressure in the bottom chamber (20a) of the single-actingcylinder to thereby promote the short-circuiting of the flow of operating oil from thebottom (20a) to rod chamber (20b) of the single-acting cylinder during the lowering ofthe cylinder.

申请人：KABUSHIKI KAISHA TOYODA JIDOSHOKKI SEISAKUSHO

地址：2-1, Toyoda-cho Kariya-shi Aichi-ken JP

国籍：JP

代理机构：Tiedtke, Harro, Dipl.-Ing.

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