Magnetic load sensor unit for use in a linear motion actuator, and linear motion actuator

A magnetic load sensor arrangement, for use in a linear motion actuator to detect a magnitude of an axial load applied to an object from the linear motion actuator, the magnetic load sensor arrangement including:

• a magnetic load sensor unit, and
• a thrust bearing configured to receive a reaction force to the axial load,
• wherein said magnetic load sensor unit comprises:
• a flange member configured to receive the reaction force to the axial load through the thrust bearing and configured to be deflected by the reaction force;
• a magnetic target which generates magnetic fields;
• and
• a magnetic sensor arranged such that a position of the magnetic sensor relative to the magnetic target changes when the flange member is deflected;
• wherein the flange member has an axial end surface on which a raceway is formed with which rolling elements of the thrust bearing are in rolling contact, and
• wherein the magnetic target comprises at least two permanent magnets each magnetized in a direction perpendicular to a relative movement direction in which the position of the magnetic sensor relative to the magnetic target changes, wherein the at least two permanent magnets are arranged such that opposite magnetic poles of the at least two permanent magnets are aligned in the relative movement direction, and wherein the magnetic sensor is located in a vicinity of a boundary between the opposite magnetic poles.