Gear and gear driving apparatus

• Main Authors: ABE KATSUFUMI, SATOU MASANORI, NAKANO YOSHIYASU
• Format: Patent
• Language: Chinese; English
• Published: 10.12.2008
• Subjects: BEARINGS; BLASTING; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; LIGHTING; MECHANICAL ENGINEERING; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; THERMAL INSULATION IN GENERAL; WEAPONS

The present invention provides a gear and a gear driving device thereof. In the gear, oil film can be sufficiently formed between the teeth surface of the gear rotating at a high speed and the mating gear surface, the occurrence of pitting, abrasion and scoring is prevented. The gear can be prevented from increasing in temperature and wearing and has improved durability. The gear is provided with countless minute dimples randomly arranged on the tooth surface, wherein the surface roughness parameter of the surface of the dimples Ryni is in the range represented by the following relationship: 0.8[mu]m<=Ryni<=2.3[mu]m. Thus, the tooth surface has high ability to form an oil film. This gear can obtain a long life even used under poor-lubrication conditions with a low viscosity and an extremely small oil-film thickness.