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:
Mar. 03, 2020
Filed:
Jun. 12, 2015
Nissan Motor Co., Ltd., Yokohama-shi, Kanagawa, JP;
Aichi Machine Industry Co., Ltd., Nagoya-shi, Aichi, JP;
Takemichi Yamashita, Kanagawa, JP;
Yutaka Mabuchi, Kanagawa, JP;
Takeshi Kariya, Kanagawa, JP;
Takao Mori, Kanagawa, JP;
Tadashi Goto, Nagoya, JP;
Hiroyasu Nagami, Kasugai, JP;
NISSAN MOTOR CO., LTD., Yokhama-shi, JP;
AICHI MACHINE INDUSTRY CO., LTD., Nagoya-shi, JP;
Abstract
A gear pair includes a first gear and a second gear that are engaged and paired with each other, wherein the arithmetic average roughness Ra of the tooth surface of the first gear is less than 0.10, and the arithmetic average roughness Ra of the tooth surface of the second gear is equal to or greater than 0.15. An improvement of the transmission efficiency is achieved due to the improved composite roughness of the gear pair. Accordingly, both of the improvement of the transmission efficiency of the gears and an improvement of the pitting fatigue life are achieved at low cost.