The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 13, 2022
Filed:
Jan. 30, 2020
Hedman Ericsson Patent Ab, Flen, SE;
Mats Hedman, Sparreholm, SE;
Hedman Ericsson Patent AB, Flen, SE;
Abstract
The present invention concerns a method for providing a variable compression ratio in a combustion engine, where the combustion chamber () is formed substantially by a piston bowl in the main piston (), comprising a secondary piston () being displaceable against spring action between an upper/outer position which provides minimal volume of the combustion chamber () and a lower/inner position which provides maximum volume of the combustion chamber (), or in a position therebetween depending on introduced air mass before the compression stroke. The method is characterized in arranging said secondary piston () resting on a spring () with substantially constant spring force adapted such that introduced air mass is to be compressed to a predetermined pressure at the end of the compression stroke. The invention also concerns a corresponding device and a diesel engine comprising such a device.