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.
Claims20
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, wherein the detent element 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, and when the valve member is moving to the open position of the pressure-limiting valve, the detent element is configured to act on the valve member laterally, wherein when moving the valve member into its open position, or when the valve member is in its open position, contact areas of the detent element and the valve member are contiguous, and wherein the detent element comprises a longitudinally drilled cylindrical detent sleeve that is penetrated by the valve member in a transverse passage, and a through-hole of the detent sleeve forms a part of a pressure line and a part of a return line.
A hydraulic drive for 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, and when the valve member is being moved to the open position of the pressure-limiting valve, the detent element is configured to act on the valve member laterally, wherein when the valve member is in the open position of the pressure-limiting valve, flat contact areas of the detent element and the valve member are contiguous, and wherein the detent element comprises a cylindrical detent sleeve that is penetrated by the valve member in a transverse passage, and a through-hole of the detent sleeve forms a part of a pressure line and a part of a return line.
A hydraulic drive for 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, and when the valve member is being moved to the open position of the pressure-limiting valve, the detent element is configured to act on the valve member laterally, wherein when the valve member is in its open position, flat contact areas of the detent element and the valve member are contiguous;
- wherein axes of a pump port, a housing hole for the detent element and a hole for the valve member intersect at right angles at one point, wherein the housing hole and the hole for the valve member are arranged in a valve insert having the seat, and wherein the valve insert is built into a hydraulic drive block containing the pump port and being connectable to the cylinder via a single hydraulic interface, and a bypass of the valve insert is configured to communicate with the pump port and the through-hole.
Dependencies are inferred from the claim text.