Patent ID: 7819380
Filing Date: 2010-10-26
Classification: H01F

Abstract:
1. A solenoid apparatus comprising: a fixed core; a coil that generates magnetic attractive force when the coil is supplied with electricity; and a movable core that is attracted to the fixed core by the magnetic attractive force generated between the fixed core and the movable core when the coil is supplied with electricity; wherein the fixed core has a fixed axial end on a side of the movable core with respect to an axial direction of the fixed core, the movable core has a movable axial end on a side of the fixed core with respect to an axial direction of the movable core, at least one of the fixed axial end and the movable axial end has at least one recession partially in a circumferential direction, the at least one of the fixed axial end and the movable axial end, which has the at least one recession, has an outer circumferential periphery and an inner circumferential periphery, and the outer circumferential periphery communicates with the inner circumferential periphery through the at least one recession with respect to a radial direction of the at least one of the fixed axial end and the movable axial end, a remainder of the at least one of the fixed axial end and the movable axial end, other than the at least one recession, is a land, which does not have a recession, and the at least one recession is dissymmetric.