Patent ID: 7040594
Filing Date: 2006-05-09
Classification: B60T,F16K

Abstract:
1. A solenoid valve comprising: a coil creating a magnetic field when current is applied; cylindrical members which are cylindrically-shaped and disposed in an inner periphery side of the coil; a plunger which is disposed so as to be slidable in the cylindrical members and attracted in in a direction corresponding to current application to the coil; a spring which presses the plunger to the other direction; and a valve element which moves together with the plunger and opens and closes a fluid passage in which fluid flows; the solenoid valve further comprising: a ring-shaped seal housing groove which is formed in an outer peripheral surface of the plunger and provided with a first surface and a second surface that face each other with a predetermined distance in a moving direction of the plunger, and a ring-shaped sealing member which is attached in the seal housing groove for forming a damper chamber isolated from the fluid passage on one end side of the plunger, wherein the predetermined distance is set to a value larger than a dimension of the sealing member in a moving direction of the plunger such that a gap is always created between the sealing member and at least one of the first surface and the second surface, a communication passage for communicating the fluid passage with the damper chamber is formed between an inner peripheral surface of the sealing member and the plunger and is always in communication with the damper chamber, and the communication passage is closed when the sealing member contacts the first surface, and the communication passage is opened when the sealing member is separated from the first surface.