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    • 8. 发明专利
    • Valve plate assembly
    • GB2592470A
    • 2021-09-01
    • GB202019704
    • 2020-12-14
    • DANFOSS AS
    • STIG KILDEGAARD ANDERSENFRANK HOLM IVERSEN
    • F04B1/2014F01B3/00F04B1/122F04B1/2007F04B39/10F04B53/10
    • A valve plate assembly 1, of a hydraulic axial piston machine, comprising a wear plate 2 made of a ceramic material surrounded by a compression ring 4; the wear plate is connected to a support plate 3 by means of the compression ring. The valve plate could be part of a rotary axial piston pump (RAPP) where the wear plate is the sliding surface at the opposite end of the cylinder block (10, fig.6) to the swash plate. Benefits include resistance to thermal shock, improved wear resistance of the ceramic relative to PEEK (Poly-Ether Ether Ketone), improved absorption of axial forces, reduction of the material in the replaceable wear plate. The compression ring can have opening for fixing means to secure it to the support plate. A seal (19, fig.5), such as an O-ring, may be used between the wear plate and support plate. The support plate can be biased by a spring section 22 which transfers load symmetrically from the cylinder block, even if the block is misaligned, and distributes it through hinge 25 to the body of the support plate and on to the ceramic wear plate. Thrust pads 8 may abut against the support plate.