Patent ID: 9702601
Date: 2017-07-11
CPC Classifications: F16F,F25B

Claim:
1. An expansion valve that throttles and expands refrigerant introduced from an upstream side of a refrigeration cycle by allowing the refrigerant to pass through a valve section in a body so as to deliver the refrigerant to a downstream side thereof, the expansion valve comprising: a refrigerant passage, formed in such a manner as to run through the body, having a lead-in port of the refrigerant at one end thereof and having a lead-out port of the refrigerant at the other end thereof; a valve hole provided midway along the refrigerant passage; a valve element configured to open and close the valve section by touching and leaving the valve hole; a drive section configured to generate drive force used to open and close the valve section; an actuating rod, supported by the body, configured to transmit the drive force of the drive section to the valve element; and a vibration-proof spring, set between the body and the actuating rod, configured to develop a sliding friction by biasing the actuating rod, the vibration-proof spring including: wherein, when the contact portions abut against the actuating rod inserted to the vibration-proof spring, the spring parts are warped to positions along the side walls of the spring body or to positions outside of the side walls of the spring body, and an elastically reactive force of the warped spring parts allows the actuating rod to slide in a stabilized manner, wherein each of the spring parts is located at a position of an opening formed in a respective one of the side walls and extends in a cantilevered manner along the side wall in a circumferential direction of the spring body, and the spring parts are in contact with the actuating rod at a plurality of positions, wherein the spring body is elastically inserted in a hole section having a circular cross section formed in the body, the hole section and the actuating rod are concentric, and the spring body is supported by the body through the elastically reactive force, and wherein gaps between the side walls of the spring body and an inner wall of the hole section constitute spaces allowing the spring parts to warp to the outside of the side walls.