A vehicle with a hydraulic transformer including a forward propulsion valve and a reverse propulsion valve connecting a common low-pressure rail respectively to a first motor line and a second motor line, which propulsion valves have a spring to hold the valve in a first position wherein it acts as
A vehicle with a hydraulic transformer including a forward propulsion valve and a reverse propulsion valve connecting a common low-pressure rail respectively to a first motor line and a second motor line, which propulsion valves have a spring to hold the valve in a first position wherein it acts as a check valve blocking the flow to the common low-pressure rail and an actuator that can switch the propulsion valve to a second position connecting the common low-pressure rail to one of the motor lines.
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1. A vehicle with a hydraulic drive system comprising: a common high-pressure rail with a high-pressure accumulator,a common low-pressure rail with a low-pressure accumulator,an internal combustion engine driving a pump connected to the common high-pressure rail and the common low-pressure rail,at l
1. A vehicle with a hydraulic drive system comprising: a common high-pressure rail with a high-pressure accumulator,a common low-pressure rail with a low-pressure accumulator,an internal combustion engine driving a pump connected to the common high-pressure rail and the common low-pressure rail,at least one motor/pump unit is provided for at least one wheel, andat least one hydraulic transformer with 4-quadrant operation that connects to the common high-pressure rail and to the at least one motor/pump unit via a first motor line and a second motor line;wherein the at least one hydraulic transformer comprises a forward propulsion valve connecting the common low-pressure rail to the first motor line and a reverse propulsion valve connecting the common low-pressure rail to the second motor line,wherein each propulsion valve comprises a spring to hold the valve in a first position, wherein the valve acts as a check valve blocking the flow to the common low-pressure rail, and an actuator that can switch the propulsion valve to a second position, wherein the valve connects the common low-pressure rail to the first or second motor lines. 2. The hydraulic drive system of claim 1, wherein said at least one hydraulic transformer further comprises: a first hydraulic transformer connecting to said common high-pressure rail and connecting to said at least one motor/pump units provided for the front 2 wheels via a first motor line and a second motor line; anda second hydraulic transformer connecting to said high-pressure rail and connecting to at least a second motor/pump units provided for the rear 2 wheels via a third motor line and a fourth motor line. 3. A hydraulic drive system for an automobile, comprising: a common high-pressure rail and a common low pressure rail;at least one motor/pump unit is provided for at least 1 wheel; andat least one hydraulic transformer with 4-quadrant operation, wherein said at least one hydraulic transformer connects to said common high-pressure rail and connects to said at least one motor/pump unit via a first motor line and a second motor line;and wherein said at least one hydraulic transformer comprises a forward propulsion valve connecting said common low-pressure rail to said first motor line and a reverse propulsion valve connecting said common low-pressure rail to said second motor line;wherein each said propulsion valve comprises a spring to hold said valve in a first position, whereby said valve acts as a check valve blocking the flow between said common low-pressure rail and said first or second motor line, and an actuator that can switch said valve to a second position, thereby permitting the flow between said common low-pressure rail and said first or second motor line. 4. The hydraulic drive system of claim 3, further comprising an internal combustion engine driving a pump connected to said common high-pressure rail and said common low-pressure rail. 5. The hydraulic drive system of claim 3, wherein said common high-pressure rail has a high-pressure accumulator and said common low-pressure rail has a low-pressure accumulator. 6. The hydraulic drive system of claim 3, said at least 1 wheel further comprising 2 front wheels, and at least one motor/pump unit is provided for the 2 front wheels. 7. The hydraulic drive system of claim 6, said at least 1 wheel further comprising 2 rear wheels, and at least one motor/pump unit is provided for the 2 rear wheels. 8. The hydraulic drive system of claim 7, wherein said at least 1 hydraulic transformer further comprises: a first hydraulic transformer connecting to said common high-pressure rail and connecting to said at least one motor/pump units for the front 2 wheels via a first motor line and a second motor line; anda second hydraulic transformer connecting to said high-pressure rail and connecting to said at least a second motor/pump units for the rear 2 wheels via a third motor line and a fourth motor line. 9. The hydraulic drive system of claim 3, said at least 1 wheel further comprising 2 rear wheels, and at least one motor/pump unit is provided for the 2 rear wheels. 10. The hydraulic drive system of claim 3, wherein, when each said propulsion valve is in said first position, said valve blocks the flow toward said common low-pressure rail and away from said first or second motor line. 11. The hydraulic drive system of claim 3, wherein the at least one motor/pump unit is provided for each wheel. 12. A hydraulic drive system for an automobile, comprising: a common high-pressure rail with a high-pressure accumulator;a common low-pressure rail with a low-pressure accumulator;an internal combustion engine driving a pump connected to the common high pressure rail and the common low pressure rail;a motor/pump unit is provided for each of 4 wheels;a first hydraulic transformer with 4-quadrant operation, wherein said first hydraulic transformer connects to said common high-pressure rail and connects to said motor/pump units for the 2 front wheels via a first motor line and a second motor line;and wherein said first hydraulic transformer comprises a forward propulsion valve connecting said common low-pressure rail to said first motor line and a reverse propulsion valve connecting said common low-pressure rail to said second motor line;wherein each said propulsion valve comprises a spring to hold said valve in a first position, whereby said valve acts as a check valve blocking the flow between said common low-pressure rail and said first or second motor line, and an actuator that can switch said valve to a second position, thereby permitting the flow between said common low-pressure rail and said first or second motor line;and a second hydraulic transformer with 4-quadrant operation, wherein said second hydraulic transformer connects to said common high-pressure rail and connects to said motor/pump units for the 2 rear wheels via a third motor line and a fourth motor line;and wherein said second hydraulic transformer comprises a forward propulsion valve connecting said common low-pressure rail to said third motor line and a reverse propulsion valve connecting said common low-pressure rail to said fourth motor line;wherein each said propulsion valve comprises a spring to hold said valve in a first position, whereby said valve acts as a check valve blocking the flow between said common low-pressure rail and said third or fourth motor line, and an actuator that can switch said valve to a second position, thereby permitting the flow between said common low-pressure rail and said third or fourth motor line. 13. The hydraulic drive system of claim 12, wherein, when each said propulsion valve is in said first position, said valve blocks the flow toward said common low-pressure rail and away from said motor line.
Berthold Heinz (Horb DEX) Beck Josef (Haigerloch DEX) Lotter Manfred (Neu-Ulm DEX), Axial piston machine of the swashplate or bent axis type having slot control and pressure balancing passages.
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