Back to results
US 12,631,200 B2Granted
Hydraulic drive system having a 2×2Q pump unit
AssigneeHMS-HYBRID MOTION SOLUTIONS GmbH
InventorsMehran Moradi, Achim Helbig, Matthias Roegner, Magnus Junginger
Life of this patent
Estimating the term…
Abstract
A hydraulic drive system for operating a hydraulic cylinder in first and second movement profiles. A hydraulic drive unit includes first and second hydraulic machines, each with first and second connections. In the first movement profile, a first cylinder chamber of the hydraulic cylinder is fluidly connected to a first fluid reservoir and a second cylinder chamber is fluidly connected to the second connection of the second hydraulic machine. In the second movement profile, the first connection of the first hydraulic machine is connected to the second connection of the second hydraulic machine.
Claims15
A hydraulic drive system for operating a hydraulic cylinder in a first movement configuration and in a second movement configuration, the system comprising:
- a hydraulic cylinder including a first cylinder chamber and a second cylinder chamber;
- a first fluid-hydraulic reservoir;
- a hydraulic drive unit having a first hydraulic machine having a first fluid line and a second fluid line and a second hydraulic machine having a first fluid line and a second fluid line;
- a first controllable valve having at least first and second valve positions, wherein the first controllable valve creates a fluid-hydraulic connection between the first cylinder chamber of the hydraulic cylinder and the first fluid-hydraulic reservoir in accordance with at least one of the first and second movement configurations;
- a second controllable valve, wherein the second controllable valve creates a fluid-hydraulic connection between the second fluid line of the second hydraulic machine and (i) with the second cylinder chamber of the hydraulic cylinder in a first valve position in accordance with one of the first and second movement configurations and (ii) with the first fluid line of the first hydraulic machine in a second valve position in accordance with the other of the first and second movement configurations;
- wherein the first hydraulic machine and the second hydraulic machine are mechanically interconnected and are operated jointly by a variable-speed drive in a same direction of rotation;
- wherein the second fluid line of the first hydraulic machine and the first fluid line of the second hydraulic machine are fluid-hydraulically connected to the first fluid-hydraulic reservoir;
- wherein, in the first movement configuration, the first cylinder chamber is fluid-hydraulically connected to the first fluid-hydraulic reservoir and the second cylinder chamber is fluid-hydraulically connected to the second fluid line of the second hydraulic machine;
- wherein, in the second movement configuration, the first fluid line of the first hydraulic machine is connected to the second fluid line of the second hydraulic machine;
- and
- wherein, to change its valve position, the first controllable valve is in fluid-hydraulic communication with the second cylinder chamber of the hydraulic cylinder via a pilot line.
8 more elements
A hydraulic drive system for operating a hydraulic cylinder in a first movement configuration and in a second movement configuration, the system comprising:
- a hydraulic cylinder including a first cylinder chamber and a second cylinder chamber;
- a first fluid-hydraulic reservoir;
- a hydraulic drive unit having a first hydraulic machine having a first fluid line and a second fluid line and a second hydraulic machine having a first fluid line and a second fluid line;
- a first controllable valve having at least first and second valve positions, wherein the first controllable valve creates a fluid-hydraulic connection between the first cylinder chamber of the hydraulic cylinder and the first fluid-hydraulic reservoir in accordance with at least one of the first and second movement configurations;
- a second controllable valve, wherein the second controllable valve creates a fluid-hydraulic connection between the second fluid line of the second hydraulic machine and (i) with the second cylinder chamber of the hydraulic cylinder in a first valve position in accordance with one of the first and second movement configurations and (ii) with the first fluid line of the first hydraulic machine in a second valve position in accordance with the other of the first and second movement configurations;
- wherein the first hydraulic machine and the second hydraulic machine are mechanically interconnected and are operated jointly by a variable-speed drive in a same direction of rotation;
- wherein the second fluid line of the first hydraulic machine and the first fluid line of the second hydraulic machine are fluid-hydraulically connected to the first fluid-hydraulic reservoir;
- wherein, in the first movement configuration, the first cylinder chamber is fluid-hydraulically connected to the first fluid-hydraulic reservoir and the second cylinder chamber is fluid-hydraulically connected to the second fluid line of the second hydraulic machine;
- wherein, in the second movement configuration, the first fluid line of the first hydraulic machine is connected to the second fluid line of the second hydraulic machine;
- and
- wherein, to change between the first valve position and the second valve position, the second controllable valve is in fluid-hydraulic communication with the first cylinder chamber of the hydraulic cylinder via a pilot line.
8 more elements
Dependencies are inferred from the claim text.