TAPERED ROLLER BEARING

• Main Authors: ISHIKAWA TAKANORI, FUJIKAKE YASUHITO, MIYAIRI SUSUMU, KAWAI TAKASHI
• Format: Patent
• Language: English; Japanese
• Published: 10.10.2019
• Subjects: BEARINGS; BLASTING; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; THERMAL INSULATION IN GENERAL; WEAPONS

To provide a tapered roller bearing that has excellent seizure resistance, as well as a long life and high durability.SOLUTION: In a tapered roller bearing, at least any one of an outer ring 11, an inner ring 13, and a plurality of tapered rollers 12 includes a nitrogen-enriched layer 11B, 12B, 13B. An oil-holding recess 14A is formed in a large annular part 107 of a cage 14. When a set radius of curvature of a roller large end face 16 of the tapered roller 12 is R, and a distance from an apex of a cone angle of the tapered roller 12 to a large collar face 18 of the inner ring 13 is R, a ratio R/Rof the set radius of curvature R to the distance Ris 0.75 or greater and 0.87 of less. When an actual radius of curvature of the roller large end face 16 of the tapered roller 12 after grinding is R, a ratio R/R of the actual radius of curvature Rto the set radius of curvature R is 0.5 or greater.SELECTED DRAWING: Figure 2 【課題】耐焼付き性に優れるとともに、長寿命かつ高い耐久性を有する円錐ころ軸受を提供する。【解決手段】円錐ころ軸受において、外輪１１、内輪１３および複数の円錐ころ１２のうちの少なくともいずれか１つは窒素富化層１１Ｂ、１２Ｂ、１３Ｂを含む。保持器１４の大環状部１０７には保油穴１４Ａが形成される。円錐ころ１２の大端面１６の設定曲率半径をＲ、円錐ころ１２の円錐角の頂点である点から内輪１３の大鍔面１８までの距離をＲBASEとしたとき、設定曲率半径Ｒと距離ＲBASEの比率Ｒ／ＲBASEの値を０．７５以上０．８７以下とする。円錐ころ１２の大端面１６の研削加工後の実曲率半径をＲprocessとしたとき、実曲率半径Ｒprocessと設定曲率半径Ｒとの比率Ｒprocess／Ｒが０．５以上である。【選択図】図２