公开(公告)号：US20180259023A1

公开(公告)日：2018-09-13

申请号：US15760303

申请日：2016-09-15

Applicant: ThermoLift, Inc.

Inventor： Peter Hofbauer ,  James F. Smith ,  Seann Convey ,  David Yates

IPC: F16F1/02 ,  F16F1/06 ,  F16F3/04 ,  F01L9/04 ,  F01L1/46 ,  F02G1/053

CPC classification number: F16F1/028 ,  F01L1/462 ,  F01L3/10 ,  F01L9/04 ,  F01L2009/0434 ,  F01L2009/0436 ,  F02G1/053 ,  F02G2270/42 ,  F16F1/06 ,  F16F3/04 ,  F16F2226/04 ,  F16F2232/08 ,  F16F2234/02 ,  H01F7/1638

Abstract: Reciprocating apparatuses such as a displacer in a Stirling engine or Vuilleumier (thermally-driven) heat pump and such as a poppet valve in an internal combustion engine have been known to be built with a mechatronic actuator. The reciprocating element has two springs in compression biased against each other. It has been found that conventional springs in compression introduce losses. A spring is disclosed in which a portion of the coil is wound in a clockwise direction and a portion is wound in a clockwise direction. Also, in reciprocation, the spring is in compression at one end of travel and in tension at the other end of travel.