Hydraulic system for a brake release device, brake release device with such a hydraulic system and brake system
AssigneeHAWE Hydraulik SE
InventorOliver Porten
Life of this patent
Estimating the term…
Abstract
A hydraulic system for a brake release device has a pump device, a tank, a valve assembly and at least one working port, where the working port is connectable to the tank or the pump device via the valve assembly. The pump device is switchable between an operating mode and a shutdown mode, where the valve assembly connects the working port to the tank in the shutdown mode and the valve assembly is only hydraulically operable. A brake release device having such a hydraulic system is also disclosed.
Claims16
A hydraulic system for a brake release device or brake system, the hydraulic system comprising:
- a pump device comprising a first pump element and a second pump element;
- a tank;
- a valve assembly that is only hydraulically operable, the valve assembly comprising a circulation device;
- and
- at least one working port, wherein the at least one working port is connectable to the tank or the pump device via the valve assembly,
- wherein the pump device is switchable between an operating mode and a shutdown mode,
- wherein the valve assembly is switchable at least partially by a pressure at the at least one working port to fluidly couple the at least one working port to the tank in the shutdown mode,
- wherein the valve assembly is switched by a pressure delivered by the pump device to fluidly couple the at least one working port to the pump device in the operating mode, and
- wherein the circulation device connects the first pump element of the pump device to the tank when a limit pressure is reached at the at least one working port, and the second pump element hydraulically controls the valve assembly such that the limit pressure at the at least one working port is maintained when the first pump element of the pump device is connected to the tank by the circulation device.
A hydraulic system for a brake release device or brake system, the hydraulic system comprising:
- a pump device comprising a first pump element;
- a tank;
- a valve assembly that is only hydraulically operable, the valve assembly comprising a circulation device;
- and
- at least one working port connectable to the tank or the pump device via the valve assembly,
- wherein the pump device is switchable between an operating mode and a shutdown mode,
- wherein the valve assembly is switchable at least partially by a pressure at the at least one working port to fluidly couple the at least one working port to the tank in the shutdown mode,
- wherein the valve assembly is switched by a pressure delivered by the pump device to fluidly couple the at least one working port to the pump device in the operating mode,
- wherein the first pump element is connected to the valve assembly via a pressure line,
- wherein the circulation device connects the pressure line to the tank when a limit pressure is reached at the at least one working port, and
- wherein a control line arrangement branches off from the pressure line between the first pump element and the at least one working port at a branch point, wherein the control line arrangement is connected to the valve assembly, such that a pressure in the control line arrangement hydraulically operates the valve assembly to block a connection between the at least one working port and the tank in the operating mode of the pump device.
Dependencies are inferred from the claim text.