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:
May. 02, 2000
Filed:
Jun. 08, 1998
Tien-Ho Gau, Hsinchu, TW;
Abstract
An automatic decompression device for four-stroke engines comprises a cam gear, a counterweight, and an acting body. The cam gear includes a cam surface and a recess containing the acting body, and the counterweight includes a plate with a guide slot. Besides, the recess pierces the cam surface. Since the acting body is engaged to the guide slot of the counterweight and there exist external forces acting on the counterweight, the counterweight is forced to move the acting body upwardly or downwards by the guidance of the plate and the limitation of the guide slot. Consequently, the acting body is exposed beyond the cam surface or tucked into the recess. With the motion of the acting body, the opening and closing duty cycles of the intake and exhaust valves are biased. When the engine of the invention is static, the acting body is exposed beyond the cam surface to partially release the pressure of the engine's combustion chamber for manually starting the engine. When the engine of the invention is rotated at a relatively high speed, the acting body is tucked into the recess to make the engine's intake and exhaust valves working normally.