US 12,345,326 B2
Hydraulic system and method for operating a hydraulic system
Peter Greb, Ottersweier (DE); Marco Grethel, Bühlertal (DE); and Peter Biegert, Gengenbach (DE)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Appl. No. 18/286,568
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
PCT Filed Mar. 25, 2022, PCT No. PCT/DE2022/100224
§ 371(c)(1), (2) Date Oct. 12, 2023,
PCT Pub. No. WO2022/223069, PCT Pub. Date Oct. 27, 2022.
Claims priority of application No. 10 2021 110 042.9 (DE), filed on Apr. 21, 2021.
Prior Publication US 2024/0200580 A1, Jun. 20, 2024
Int. Cl. F16H 61/00 (2006.01); F15B 11/08 (2006.01); F16H 61/02 (2006.01); F16H 61/30 (2006.01); F16H 63/38 (2006.01)
CPC F16H 61/0025 (2013.01) [F15B 11/08 (2013.01); F16H 61/0267 (2013.01); F16H 61/30 (2013.01); F16H 2061/0037 (2013.01); F16H 63/38 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A hydraulic system comprising:
a reversing pump having two delivery connections via which a hydraulic medium is delivered from a tank in opposite delivery directions of the reversing pump to hydraulically actuate an actuating element so as to supply at least one of a cooling system or lubricating system with hydraulic medium, and
a valve assembly having an actuating piston arranged in a double-acting actuating cylinder, the valve assembly configured to be supplied with hydraulic medium, and the actuating piston mechanically coupled to a locking device and to the actuating element, and
a first delivery connection of the reversing pump is fluidly connected to: i) a first tank non-return valve configured to block in a direction of the tank, and ii) to a first pressure connection of the double-acting actuating cylinder, and
a second delivery connection of the reversing pump is fluidly connected to: i) a second tank non-return valve configured to block in the direction of the tank, and ii) to a second pressure connection of the double-acting actuating cylinder, and
the actuating piston is mechanically coupled to a valve piston of a valve, and the valve piston: i) delimits two outer valve chambers which are fluidly connected to each other, and ii) is mechanically coupled to the actuating element.
 
9. A hydraulic system comprising:
a reversing pump having two delivery connections via which a hydraulic medium is delivered from a tank in opposite delivery directions of the reversing pump to hydraulically actuate an actuating element so as to supply at least one of a cooling system or lubricating system with hydraulic medium, and
a valve assembly having:
an actuating piston arranged in a double-acting actuating cylinder, the valve assembly configured to be supplied with hydraulic medium, and the actuating piston mechanically coupled to a locking device and to the actuating element, and
a valve comprising:
a valve piston mechanically coupled to the actuating piston and the actuating element,
a first inlet and a second inlet, and
two outlets fluidly connected to the at least one of the cooling system or lubrication system, and
a first delivery connection of the reversing pump is fluidly connected to: i) a first pressure chamber defined by the actuating piston and the double-acting actuating cylinder, and ii) the first inlet, and
a second delivery connection of the reversing pump is fluidly connected to: i) a second pressure chamber defined by the actuating piston and the actuating piston, and ii) the second inlet and
wherein an interior of the valve is divided into two outer valve chambers and an inner valve chamber via the valve piston, and the two outer valve chambers are fluidly connected to each other.
 
17. A hydraulic system comprising:
a reversing pump having two delivery connections via which a hydraulic medium is delivered from a tank in opposite delivery directions of the reversing pump to hydraulically actuate an actuating element so as to supply at least one of a cooling system or lubricating system with hydraulic medium, and
a valve assembly having an actuating piston arranged in a double-acting actuating cylinder so as to divide the double-acting actuating cylinder into a first pressure chamber and a second pressure chamber, the valve assembly configured to be supplied with hydraulic medium, and the actuating piston mechanically coupled to a locking device and to the actuating element, and
a first delivery connection of the reversing pump is fluidly connected to: i) a first tank non-return valve configured to block in a direction of the tank, and ii) to the first pressure chamber of the double-acting actuating cylinder, and
a second delivery connection of the reversing pump is fluidly connected to: i) a second tank non-return valve configured to block in the direction of the tank, and ii) to the second pressure chamber of the double-acting actuating cylinder, and
the actuating piston is mechanically coupled to a valve piston of a valve, and the valve piston: i) delimits two outer valve chambers, and ii) is mechanically coupled to the actuating element, and
wherein the two outer valve chambers are fluidly connected to the at least one of the cooling system or the lubricating system.