B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 39/08 (2006.01) B21B 39/08 (2006.01)
Patent
CA 2151517
Pressure generators are disclosed for carrying out a process for allowing the attachment of drive or coupling elements, such as cams, gears, crank webs or bearing elements, such as friction bearing bushes, or complete roller bearings on tubes or tubular portions by hydraulic expansion, thereby producing assembled cam shafts, or the like. The expansion of the tubes takes place exclusively in the region of the respective elements beyond the elasticity of the tubes, against a permanent elastic pre-stress in the elements. To relieve the load on the seal limiting the regions to be expanded, a counter pressure which is higher than the ambient pressure is applied to the intermediate or end regions by a pressure generator characterized, according to the present invention, in that one single working or pressure converting piston, in the course of one operating stroke, loads at least two pressure agent exits with different pressures. The working piston is specially designed as a differential piston; by connecting certain dead spaces, the different pressure curves required to carry out the process are generated.
Maus Wolfgang
Swars Helmut
Emitec Gesellschaft Fur Emissionstechnologie Mbh
Ridout & Maybee Llp
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