Patent ID: 9017044
Filing Date: 2015-04-28
Classification: F04B

Abstract:
1. An electromagnetic pump comprising: a cylinder; a piston capable of reciprocating in the cylinder; an electromagnetic portion that moves the piston forward; a first biasing member that moves the piston backward; a support member that supports the first biasing member and defines a pump chamber together with the cylinder and the piston; an intake open-close valve that is incorporated into the support member, and allows a hydraulic fluid to move from an intake port to the pump chamber and prohibits the hydraulic fluid from moving in a reverse direction; and a discharge open-close valve that allows the hydraulic fluid to move from the pump chamber to a discharge port and prohibits the hydraulic fluid from moving in the reverse direction, and a cover member that covers an end surface of the cylinder, the cover member covering the end surface in a state where the piston, the first biasing member, the support member and the intake open-close valve are incorporated into the cylinder from a side of the end surface in this order, wherein: the intake open-close valve includes a ball, an opening member in which an opening portion of the intake port is formed, and a second biasing member that presses the ball against the opening portion from a side opposite to a direction in which the hydraulic fluid moves, the opening member includes (i) a cylinder-shaped cylindrical portion having an inner peripheral surface of the opening portion that receives the ball formed in a taper shape, and (ii) a flange portion that radially extends from an edge of the cylindrical portion and is in contact with an end surface of the support member on a side of the opening portion, and the cylinder has a stepped portion which contacts with the support member, and the support member and the intake open-close valve are fastened by the stepped portion of the cylinder and the cover member.