Patent ID: 9285051
Filing Date: 2016-03-15
CPC Classification: F16K,F25B,Y10T

Claim Text:
1. A control valve driven by a stepping motor, comprising: a body having an inlet port for introducing a refrigerant from an upstream side, an outlet port for delivering the refrigerant toward a downstream side, and a valve hole for communicating the inlet port and the outlet port together; a valve element configured to open and close a valve section by contacting and leaving the valve hole; a stepping motor including a rotor for driving the valve element in directions in which the valve section is opened and closed; a valve actuating member configured to rotate with the rotor and to drive the valve element in the directions in which the valve section is opened and closed, by converting a rotational movement around an axis line of the rotor into a translational movement of the valve actuating member in an axis line direction; a shaft that is fixed to the body and extends in the axis line direction of the rotor; a first guide part having a spiral shape that is disposed, in an extended manner, on an outer circumferential surface of the shaft and in an axis line direction of the shaft; and a rotation stopper that has both an engagement part engaged along the first guide part and a power transmission part supported by the rotor, and that is displaced in the axis line direction of the shaft with the rotation of the rotor, and that regulates the rotation of the rotor with the power transmission part being respectively stopped by one end side and the other end side of the shaft, wherein the valve actuating member is supported by the rotor so as to be capable of making a translational movement of the valve actuating member in the axis line direction with respect to the rotor, while a rotational movement with respect to the rotor is regulated, wherein the rotor is of a hollow shape such that the rotor has bearing parts on one end side and the other end side of the rotor, a second guide part, which is engaged with the power transmission part, is disposed on an inner circumferential surface of the rotor, and the rotor rotates in a state in which the rotor is held at a predetermined position along the axis line direction in the body, and wherein the shaft and the first guide part are extended in an internal space of the rotor, so that the rotation stopper is displaced in the internal space.