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:
Jun. 22, 1993
Filed:
Oct. 16, 1991
Masao Koriyama, Iwata, JP;
Yamaha Hatsudoki Kabushiki Kaisha, Iwata, JP;
Abstract
A variable compression ratio mechanism for a two cycle diesel engine embodying auxiliary exhaust passages and auxiliary exhaust ports that communicate with the cylinder above the main exhaust ports and in which control valves are positioned for controlling the opening and closing of the auxiliary exhaust ports to change the effective compression ratio of the engine to minimize dead space between exhaust control valves and the auxiliary exhaust ports, the exhaust control valves are positioned in close proximity to the cylinder and comprise valve elements that operate in bores that are disposed substantially parallel to the cylinder bore. Both rotary and reciprocating type valves are disclosed and various mechanisms are disclosed for interlinking the control valves for simultaneous operation. In addition, the positioning of the auxiliary exhaust passages permits the formation of a cooling jacket between them that cools not only the auxiliary exhaust passages but also the control valves and the main exhaust passage. Embodiments are shown of adapting these principals to multiple cylinder engines and in which the main exhaust passages are formed in an acute angle to a plane containing the axes of the cylinder bores so as to permit a compact construction.