Patent ID: 6619616
Filing Date: 2003-09-16
Classification: F16K,Y10T

Abstract:
A solenoid valve device for switching over communication among first, second and third fluid circuits, comprising:a stator including a coil; a housing, made of magnetic material and connected with the stator, having a fluid passage formed inside, an accommodation bore whose axial end communicates with the fluid passage and whose another axial end is opened to an outer wall of the housing on a side of the stator, and first, second and third fluid ports through which the first, second and third fluid circuits communicate with the fluid passage, respectively, the housing being provided on an inner wall of the housing forming the fluid passage around the axial end of the accommodation bore with a stopper portion; a movable core axially opposed to and spaced from the outer wall of the housing to which the accommodation bore is opened and axially movable reciprocatingly upon energizing and de-energizing the coil; a valve seat member, fixed to an inner circumferential wall of the housing forming the fluid passage, having a through-hole through which the first fluid port is capable to communicate with the third fluid port, a communication bore through which the through-hole communicates with the second fluid port, a first valve seat formed around an axial end of the through-hole on a side of the first fluid port and a second valve seat formed around another axial end of the through-hole on a side of the third fluid port; a movable member fixed to and movable together with the movable core, the movable member extending axially through the accommodation bore and having a contact portion accommodated in the fluid passage between the stopper portion and the second valve seat and a rod inserted into the through-hole from a side of the contact portion with a gap between an outer circumference of the rod and an inner circumference of the through-hole; a ball arranged on an opposite side to the contact portion with respect to the valve seat member and axially urged toward the first valve seat, wherein, when the movable member moves with the movable core toward the stator, the contact portion comes in contact with and rests at the stopper portion so that the ball comes in contact with the first valve seat, which results in achieving communication between the second and third fluid ports through the through-hole and the communication bore and shutting off communication between the first and second fluid ports and communication between the first and third fluid ports and, when the movable member moves with the movable core in a direction opposite to the stator, the contact portion comes in contact with and rest at the second valve seat so that the ball is pushed by the rod and leaves the first valve seat, which results in achieving communication between the first and second fluid ports through the through-hole and the communication bore and shutting off communication between the third and first fluid ports and communication between the third and second fluid ports.