US 11,692,534 B2
Axial piston pump
Meric Amstutz, Port (CH); and Rolf Bachmann, Busswil BE (CH)
Assigned to Contelec AG, Biel/Bienne (CH)
Filed by Contelec AG, Biel/Bienne (CH)
Filed on Dec. 17, 2020, as Appl. No. 17/125,881.
Claims priority of application No. 19218312 (EP), filed on Dec. 19, 2019.
Prior Publication US 2021/0190055 A1, Jun. 24, 2021
Int. Cl. F04B 27/18 (2006.01); F04B 27/08 (2006.01)
CPC F04B 27/18 (2013.01) [F04B 27/0878 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An axial piston pump (6) having several pistons (64), having a magnetic encoder (5) arranged on a swash plate (65), and a magnetic field sensor (7) which is arranged in such a way that it faces towards the magnetic encoder (5), characterised in that the magnetic encoder (5) has a housing made of a non-ferromagnetic material, which has at least two recesses (121, 122) in which at least two permanent magnets (2, 3) are arranged and a plate (4) which consists of a ferromagnetic material, where the at least two recesses are covered by the plate, and wherein the at least two permanent magnets (2, 3) are arranged on the plate (4) in such a way that they each face a magnetic pole (21, 31) towards the plate (4), and each pole (21, 31) is at least partially covered by the plate (4) in each case, and where all surfaces of the permanent magnets (2, 3) which do not contact the plate (4) are surrounded by at least one non-ferromagnetic material.