公开(公告)号：US20220220920A1

公开(公告)日：2022-07-14

申请号：US17570859

申请日：2022-01-07

Applicant: MATERION CORPORATION

Inventor： Andrew Tarrant ,  David TRICKER ,  Steffen MACK ,  David KRUS ,  Andrew RUZEK ,  Fritz GRENSING

IPC: F02F3/00 ,  B22D21/00 ,  C22C21/16 ,  C22C21/14 ,  F16J9/22

Abstract: The present disclosure relates to piston assembly comprising a piston having a circumferential groove and a ring groove insert within the circumferential groove of the piston. Particularly, the ring groove insert is a second material different from a first material of the piston. The second material has at least one of the following: a) a density from 90% to 120% of a density of the first material; b) a coefficient of thermal expansion (CTE) from 50% to 90% of a CTE of the first material; or c) a thermal conductivity greater than a thermal conductivity of the first material.

公开(公告)号：US20210396313A1

公开(公告)日：2021-12-23

申请号：US17466964

申请日：2021-09-03

Applicant: MATERION CORPORATION

Inventor： David KRUS ,  Steffen MACK ,  Andrew J. WHITAKER

IPC: F16J9/26 ,  C22C9/06

Abstract: A piston ring is made from a copper-nickel-silicon-chromium alloy. This material permits the top compression ring of a piston to be moved closer to the piston crown, reducing crevice volume and reducing the tendency for pre-Ignition. Ignition timing advance can be realized by installing the rings and letting the ECU advance the timing as the sensors allow, increasing efficiency. Also, shorter pistons and longer connecting rods are possible. The shorter pistons reduces the reciprocated mass in the engine and the longer connecting rods reduce the frictional loss caused by radial forces pushing the piston against the liner. Both reducing volume and tendency for pre-ignition increase engine efficiency.