초록 ▼

A hydraulic system having an axial piston pump as a control pump which is regulated by a regulating device as a function of the demands with respect to volumetric flow and pressure of a load circuit supplied by it. On the suction side, the control pump is optionally provided with a partial amount of

A hydraulic system having an axial piston pump as a control pump which is regulated by a regulating device as a function of the demands with respect to volumetric flow and pressure of a load circuit supplied by it. On the suction side, the control pump is optionally provided with a partial amount of its maximum delivery volume by a feed pump, while the remaining part of the corresponding delivery quantity is drawn in directly from a storage container, bypassing the feed pump. Possibly impermissibly high vacuums on the suction side of the control pump are detected by a suction safety device which acts on the control pump via its regulating device so that the control pump delivers smaller quantities of hydraulic fluid unitl permissible operating conditions are reached.

대표청구항 ▼

A hydraulic system comprising: a control pump for supplying hydraulic fluid to a load circuit, said control pump being coupled at its input to a storage container containing hydraulic fluid and said hydraulic fluid flowing into said control pump at a measurable suction-pressure; and control means fo

A hydraulic system comprising: a control pump for supplying hydraulic fluid to a load circuit, said control pump being coupled at its input to a storage container containing hydraulic fluid and said hydraulic fluid flowing into said control pump at a measurable suction-pressure; and control means for controlling said control pump such that during a normal control mode said control pump is responsive to hydraulic fluid demands of said load circuit and further such that, when said measurable suction-pressure falls below a predetermined value, said normal control mode is overridden and said control pump is controlled such that the volume of hydraulic fluid being supplied by said control pump to said load circuit varies as a function of the actual pressure of said suction-pressure.