US 12,241,551 B2
Lubrication for hydraulic machine seal
Adam Frey, Verberie (FR); Patrick Jalabert, Verberie (FR); and Laurent Naceur, Verberie (FR)
Assigned to Poclain Hydraulics Industrie, (FR)
Appl. No. 17/926,925
Filed by Poclain Hydraulics Industrie, Verberie (FR)
PCT Filed May 24, 2021, PCT No. PCT/FR2021/050942
§ 371(c)(1), (2) Date Nov. 21, 2022,
PCT Pub. No. WO2021/240105, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 2005493 (FR), filed on May 25, 2020.
Prior Publication US 2023/0204106 A1, Jun. 29, 2023
Int. Cl. F16J 15/16 (2006.01); F16J 15/3204 (2016.01)
CPC F16J 15/162 (2013.01) [F16J 15/3204 (2013.01); F16N 2210/14 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A hydraulic machine comprising a first assembly comprising a crankcase and a cam, and a second assembly comprising a shaft and a cylinder block, the first and second assembly being movable in rotation relative to each other about an axis of rotation, the first assembly and the second assembly defining an internal volume and being in contact along an interface, the interface between the first assembly and the second assembly being provided with a sealing element positioned in a housing connected to the internal volume via a first duct, and to the surrounding environment via a second duct,
the first duct being provided with a sealing element adapted to isolate the housing from the internal volume,
wherein
said sealing element is an axial sealing element comprising a first metal annulus and a second metal annulus, a first elastomeric annulus and a second elastomeric annulus, wherein the first metal annulus and the second metal annulus are bearing against each other along the axial direction defined by the axis of rotation, the first elastomeric annulus is mounted bearing against the first metal annulus on the one hand, and against a partition wall of the first assembly on the other hand, the second elastomeric annulus is mounted bearing against the second metal annulus on the one hand, and against a partition wall of the second assembly on the other hand,
a secondary cavity is formed in a portion of the crankcase of the hydraulic machine, said secondary cavity being isolated from the internal volume and connected to the housing via a plurality of bores formed in the first assembly, wherein said bores extend over an angular sector less than or equal to 180° about the axis of rotation, wherein the secondary cavity is dimensioned such that its volume is greater than or equal to the volume of the housing.