Title:
TOROIDAL CONTINUOUSLY VARIABLE TRANSMISSION
Document Type and Number:
Japanese Patent JP3702618
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a long-life toroidal continuously variable transmission with long-life reliable structural members, capable of preventing itself from cracking due to fatigue.
SOLUTION: Such carbonitriding heat treatment is given that a surface hardness is satisfied with a Vickers hardness Hv720 or more and a hardness at a depth Dx from the surface is satisfied with Hv650 or more after raw material for a power roller bearing and input/output discs composed of C; 0.15-0.5%, Si; 0.15-1.5% and Mo; 0.1-1.5% and containing oxygen 9 ppm or less is carbonitrided, quenched, annealed, polished and finished. Physical surface hardening treatment is given so that Dx can be satisfied with 3.0Zo-5.0Zo and residual stress value at 0.5-1.0Dx position can be satisfied with -130 to -60 kgf/mm2, where Dx means a critical equivalent stress generation position in composite stress distribution and Zo means a dynamic maximum shearing stress generation position.
Inventors:
Hiromichi Takemura
Nobuaki Mitamura
Nobuaki Mitamura
Application Number:
JP30204697A
Publication Date:
October 05, 2005
Filing Date:
November 04, 1997
Export Citation:
Assignee:
Nippon Seiko Co., Ltd.
International Classes:
C21D9/40; C22C38/00; C22C38/12; F16C19/10; F16H15/38; (IPC1-7): F16H15/38; C22C38/00; C22C38/12; F16C19/10
Domestic Patent References:
| JP8338493A | ||||
| JP7055603A | ||||
| JP9111408A | ||||
| JP9014373A |
Attorney, Agent or Firm:
Takehiko Suzue
Sadao Muramatsu
Atsushi Tsuboi
Ryo Hashimoto
Satoshi Kono
Makoto Nakamura
Sadao Muramatsu
Atsushi Tsuboi
Ryo Hashimoto
Satoshi Kono
Makoto Nakamura