Hydraulic drive
AssigneeHAWE Hydraulik SE
InventorAlexander HAEHL
Life of this patent
Estimating the term…
Abstract
In a hydraulic drive of a tool piston in a cylinder first and second flat contact areas each are contiguous, when moving into and in the open position of the valve member between the detent element and the valve member, wherein a pressure-limiting valve that can be loaded with the pressure in the cylinder from a closed position to an open position and a detent element loaded by a spring in the locking direction to positively hold a neck of a valve member of the pressure-limiting valve are arranged in the open position, wherein the detent element at least via the tool piston at its return to a released position can be moved and, when moving the valve member to the open position of the pressure-limiting valve, non-positively acts on the valve member.
Claims18
A hydraulic drive of a tool piston in a cylinder that can be loaded against a return spring by a pump, in particular of a pressing tool, wherein there are provided a pressure-limiting valve, wherein the pressure-limiting valve can be loaded with the pressure in the cylinder from a closed position to an open position against spring force, and a detent element, wherein the detent element is loaded by a spring to a locked position, to hold a valve member of the pressure-limiting valve lifted from a seat in the open position, and wherein the detent element that is arranged transversely to the valve member can be moved from the locked position to a released position at least via the tool piston at its return stroke, in the locked position does support the valve member positive and non-positive, and when moving the valve member to the open position of the pressure-limiting valve does non-positively act on the valve member laterally, wherein at least when moving the valve member into and in its open position first and second flat contact areas of the detent element and of the valve member each are contiguous.
A hydraulic drive of a tool piston in a cylinder that can be loaded against a return spring by a pump, the hydraulic drive comprising:
- a pressure-limiting valve that can be loaded with pressure in the cylinder from a closed position to an open position against spring force;
- and
- a detent element that is loadable by a spring to a locked position, to hold a valve member of the pressure-limiting valve lifted from a seat in the open position, wherein the detent element is arranged transversely to the valve member and can be moved from the locked position to a released position at least via the tool piston at its return stroke, wherein, in the locked position, the detent element is configured to support the valve member positively and non-positively, and when moving the valve member to the open position of the pressure-limiting valve, the detent element is configured to non-positively act on the valve member laterally, wherein when moving the valve member into its open position, and when the valve member is in its open position, first and second flat contact areas of the detent element and of the valve member each are contiguous.
Dependencies are inferred from the claim text.