US 11,754,059 B2
Piston of a hydraulic machine and hydraulic piston machine
Stig Kildegaard Andersen, Krusaa (DK); Frank Holm Iversen, Padborg (DK); and Sveinn Porarinsson, Reykjavik (IS)
Assigned to Danfoss A/S, Nordborg (DK)
Filed by Danfoss A/S, Nordborg (DK)
Filed on Sep. 30, 2020, as Appl. No. 17/38,818.
Claims priority of application No. 102019130843.7 (DE), filed on Nov. 15, 2019.
Prior Publication US 2021/0148342 A1, May 20, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. F04B 1/124 (2020.01); F04B 1/2078 (2020.01)
CPC F04B 1/124 (2013.01) [F04B 1/2078 (2013.01)] 16 Claims
OG exemplary drawing
1. A piston of a hydraulic piston machine, the piston having a hollow surrounded by a wall and an insert arranged in the hollow, wherein at least two pliable rings are arranged between the insert and the wall, wherein a gap is formed between the insert and the wall, and wherein at least a first ring of the at least two rings comprises at least one thin section having a radial extent smaller than a largest radial extent of the first ring and forming a passage for a fluid.