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US 8,756,931 B2Granted
Device for adjusting the stroke volume of hydraulic piston machines
AssigneeZF Friedrichshafen AG
InventorJurgen Legner
Life of this patent
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Abstract
A device for adjusting the swept volume of a first piston machine (1), of transverse axis design, and a second piston machine (2), of transverse axis design. The device including a common component (4), via which the swept volumes can be adjusted, and a valve (12) which, when a maximum pressure level in the working lines (3) is exceeded, can be rerouted in such a way that the common component (4) reroutes the swept volume in a direction toward the lower power input.
Claims11
A device for adjusting a swept volume of a hydraulic piston machine of a transverse axis design comprising:
- a first piston machine (1) arranged adjacent to a second piston machine (2),
- working lines (3) hydraulically connecting the first and the second piston machines to one another, and
- a common component (4) connected to adjustable axles on each of the first and the second piston machines such that the adjustable axles are simultaneously adjusted by movement of the common component (4);
- wherein a common component adjuster facilitates adjustment of a position of the common component (4) into first and second positions, and
- in the first position of the common component (4), the first hydraulic piston machine (1) is adjusted to one of a small and a zero swept volume and the second hydraulic piston machine (2) is adjusted to one of a large and a maximum swept volume, and,
- in the second position of the common component (4), the first hydraulic piston machine (1) is adjusted to one of a large and a maximum swept volume and the second hydraulic piston machine (2) is adjusted to one of a small and a minimum swept volume;
- depending on an input from a first manual input device (10), the common component (4) is adjusted in one of a direction toward the first position and in a direction toward the second position;
- independently of the manual input (10), the common component (4) is adjusted, in the direction toward the first position if a predefined pressure is exceed in one of the working lines (3);
- an additional manual input device (22) is provided;
- and
- when the additional manual input device (22) is actuated, the common component (4) is adjusted in the direction toward the first position as a function of both a pressure in the working lines (3) and the actuation of the additional manual input device (22) such that with an unchanged actuation of the manual input device (10) and with actuation of the additional manual input device (22), the common component (4) is adjusted in the direction of the first position at a lower pressure in the working lines (3) than in a case of the additional manual input device (22) being un-actuated.
8 more elements
A device for adjusting a swept volume of hydraulic first and second piston machines of bent-axis design,
- wherein the first piston machine (1) is arranged adjacent to the second piston machine (2),
- both piston machines have working lines (3) via which the first and the second piston machines are hydraulically connected with one another,
- the first and the second piston machines are provided with adjustable axles which are connected, via a common component (4), in such a way that the adjustable axles are simultaneously adjusted by movement of the common component (4) via a common component adjusting element (5),
- in the first adjusted position of the common component (4), the first hydraulic piston machine (1) is adjusted to a small or zero swept volume and the second hydraulic piston machine (2) is adjusted to a large or maximum swept volume, and
- in a second position of the common component (4), the first hydraulic piston machine (1) is adjusted to a large or maximum swept volume and the second hydraulic piston machine (2) is adjusted to a small or minimum swept volume,
- the common component (4) is adjusted as a function of a manual input device (10), either in a direction toward the first position or the second position, and, if a predefined pressure is exceed in one of the working lines (3), the common component (4) is adjusted in a direction toward the first position independently of the manual input device (10),
- a further manual input device (22) is capable of adjusting the common component (4), in the direction of the first position, as a function of both a pressure in the working lines and actuation of the further manual input device (22) such that, in a case of both an unchanged actuation of the manual input device (10) and an actuated further manual input device (22), the common component (4) is adjusted in the direction of the first position at a lower pressure in the working lines (3) than in the case of the further manual input device (22) being un-actuated.
4 more elements
A device for adjusting a swept volume of a hydraulic piston machine of a transverse axis design comprising:
- a first piston machine (1) arranged adjacent to a second piston machine (2),
- working lines (3) hydraulically connecting the first and the second piston machines to one another, and
- a common component (4) connected to adjustable axles on each of the first and the second piston machines such that the adjustable axles are simultaneously adjusted by movement of the common component (4);
- wherein a common component adjuster facilitates adjustment of a position of the common component (4) into first and second positions, and
- in the first position of the common component (4), the first hydraulic piston machine (1) is adjusted to one of a small and a zero swept volume and the second hydraulic piston machine (2) is adjusted to one of a large and a maximum swept volume, and,
- in the second position of the common component (4), the first hydraulic piston machine (1) is adjusted to one of a large and a maximum swept volume and the second hydraulic piston machine (2) is adjusted to one of a small and a minimum swept volume;
- depending on an input from a first manual input device (10), the common component (4) is adjusted in one of a direction toward the first position and in a direction toward the second position;
- independently of the manual input (10), the common component (4) is adjusted in the direction toward the first position if a predefined pressure is exceed in one of the working lines (3);
- an additional manual input device (22) is provided;
- and
- when the additional manual input device (22) is actuated, the common component (4) is adjusted in the direction toward the first position as a function of both a pressure in the working lines (3) and the actuation of the additional manual input device (22) such that with an unchanged actuation of the manual input device (10) and with actuation of the additional manual input device (22), the common component (4) is adjusted in the direction of the first position at a lower pressure in the working lines (3) than in a case of the additional manual input device (22) being un-actuated;
- and
- the common component adjuster is a hydraulic cylinder (5), and hydraulic fluid from a pressure medium source must pass through at least two valves (10, 12) before reaching the hydraulic cylinder (5).
10 more elements
Dependencies are inferred from the claim text.