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31. 发明专利

JP2000291757A POWER ROLLER BEARING OF TOROIDAL TYPE CONTINUOUSLY VARIABLE TRANSMISSION 失效
公开(公告)号：JP2000291757A
公开(公告)日：2000-10-20
申请号：JP9884299
申请日：1999-04-06
申请人： NSK LTD
发明人： IMANISHI TAKASHI , GOTO NOBUO , MURAKAMI YASUO , YOSHIKAWA TOMONOBU
IPC分类号： F16H15/38 , F16C33/58
摘要： PROBLEM TO BE SOLVED: To provide a power roller bearing of a toroidal type continuously variable transmission which can restrain the drop of a life. SOLUTION: A power roller bearing 11 is used for a toroidal type continuously variable transmission used for the transmission of an automobile and has a power roller 10, outer race 13, plural balls 12 and a holder 14. The outer race 13 and power roll 10 are formed in an annular shape respectively. Raceway grooves 15, 16 are formed on the end surface 17, 18 facing each other of the outer race 13 and power roller 10. The raceway grooves 15, 16 are formed in the annular shape and arc section shape respectively. Residual compression stress layers 23, 24 are formed on the surfaces of the raceway grooves 15, 16 respectively.

32. 发明专利

JP2000257636A ROLLING BEARING 失效
公开(公告)号：JP2000257636A
公开(公告)日：2000-09-19
申请号：JP6184899
申请日：1999-03-09
申请人： NSK LTD
发明人： MATSUMOTO YOICHI , GOINO MAKOTO , MURAKAMI YASUO
IPC分类号： F16C33/32 , F16C33/62
摘要： PROBLEM TO BE SOLVED: To provide an inexpensive and long-lived bearing in the environment in which water and solid foreign matter get mixed in lubricant as in a bearing for a rolling mill. SOLUTION: Carbon concentration of at least one rolling surface of an inner ring, outer ring, and a rolling unit is set to 0.30% or more 0.80% or less, so as to hold hardness of required minimum limit and reduce deposition of film- state carbide in an old austenite grain boundary of the rolling surface. An amount of P, Sb, As promoting deposition of this film-state carbide is specified. An amount of Al, N, Mo, B, Nb, V having an effect fine dispersing the carbide is specified. An existence frequency of oxide system inclusion of 13 μm or more harmful for a corrosive fatigue life is specified, and an amount of O and S of element thereof is specified. A hermetic seal is mounted for suppressing infiltration of solid foreign matter, a roller of 20 mm or more is used for the rolling unit. For maintaining surface hardness of the rolling surface, a residual austenite amount is specified.

33. 发明专利

JP2000144331A ROLLING BEARING 失效
公开(公告)号：JP2000144331A
公开(公告)日：2000-05-26
申请号：JP36299298
申请日：1998-12-21
申请人： NSK LTD
发明人： TAKEMURA HIROMICHI , MURAKAMI YASUO , SEKINO KAZUO
IPC分类号： F16C33/62 , C22C38/00 , C22C38/28
摘要： PROBLEM TO BE SOLVED: To prolong the rolling life of a rolling bearing used under high temp., high vibration and high loads such as of an engine auxiliary machine or the like. SOLUTION: This is a rolling bearing 1 in which plural rolling elements 4 are arranged on the spaces of bearing rings composed of a fixed ring 2 and a rotary ring 3, at least either the fixed ring 2 or the rotary ring 3 contg. 0.65 to 1.25% C, 0.7 to 2.5% Si and 0.5 to 3.0% Cr and moreover contg. at least one kind of 0.5 to 3.0% Mo and 0.05 to 0.5% Ti is subjected to tempering treatment after quenching to finely disperse and precipitate Mo carbides or Ti carbides of 50 to 300 nm, by which hydrogen trapping effect on the rolling surface by the Mo or Ti carbides is obtd. to suppress and prevent the intrusion of hydrogen into the vicinity of the maximum shearing stress position, and moreover, the generation and propagation of initial microcracks are suppressed and prevented by the dispersion and precipitation of the fine Mo carbides.

34. 发明专利

JP2002257144A ROLLING BEARING 失效
公开(公告)号：JP2002257144A
公开(公告)日：2002-09-11
申请号：JP2001055726
申请日：2001-02-28
申请人： NSK LTD
发明人： KIUCHI AKIHIRO , MURAKAMI YASUO , FUJITA SHINJI
IPC分类号： F16C33/62 , C22C38/00 , C22C38/18
摘要： PROBLEM TO BE SOLVED: To provide a rolling bearing which is costless and durable even when used in a high vibration, heavy load, and high temperature environment. SOLUTION: The fixed ring of the rolling bearing provided with the fixed ring, the rotation ring, and the rolling body is made of a steel composed of 0.8-1.1% of C, 0.1-1.2% of Si, 0.2-1.2% of Mn, 0.8-1.8% of Cr, and the rest of iron and inevitable impurities and the truck face has 10-30% of carbide in the areal ratio and 50% or more carbide by areal ratio have 0.5 μm or smaller particle size and further, the solid solution carbon ranges 0.5-0.65%.

35. 发明专利

JP2003130163A TOROIDAL INFINITE VARIABLE-SPEED MACHINE 审中-公开
公开(公告)号：JP2003130163A
公开(公告)日：2003-05-08
申请号：JP2001322353
申请日：2001-10-19
申请人： NSK LTD
发明人： YOSHIKAWA TOMONOBU , MURAKAMI YASUO
IPC分类号： F16H15/38 , C21D9/40 , C23C8/20 , C23C8/30 , F16C33/64
摘要： PROBLEM TO BE SOLVED: To provide a toroidal infinite variable-speed machine, by which a long service life can be obtained, even under high torque by improving the durability of an outer ring for a power roller. SOLUTION: The toroidal infinite variable-speed machine is provided with the power roller 6 for transmitting power provided between an input and an output disc 1, 2 and the outer ring 9 for the power roller used to support the power roller 6 by bringing into contact with this power roller 6 via a roller 10, and the above outer ring 9 for the power roller has a groove portion 9a into which the above roller 10 is fitted, on the bearing face opposite to the power roller 6. The outer ring 9 for the power is subjected to finish machine after carbonitriding treatment, a surface carbon density C1 is 0.8-1.4%, a surface nitride density N1 is 0.05-0.4%, in the groove portion of the bearing face, a surface carbon density C2 is 0.9-1.4%, a surface nitride density N2 is 0.05-0.4% at the back face portion after the machining, and C1+N1

36. 发明专利

JP2002147557A TOROIDAL TYPE CONTINUOUSLY VARIABLE TRANSMISSION 失效
公开(公告)号：JP2002147557A
公开(公告)日：2002-05-22
申请号：JP2000346996
申请日：2000-11-14
申请人： NSK LTD
发明人： YOSHIKAWA TOMONOBU , MURAKAMI YASUO
IPC分类号： C22C38/00 , C22C38/18 , F16C19/10 , F16C19/32 , F16C33/62 , F16H15/38 , F16H55/32
摘要： PROBLEM TO BE SOLVED: To ensure durability equal or superior to the conventional one and to considerably reduce a heat treatment cost. SOLUTION: This toroidal type continuously variable transmission is composed of a rotatably supported input shaft, an input side disc, an output side disc, a plurality of trunnions, a plurality of power rollers and a thrust rolling bearing 32. The mutually opposed inner side faces of both input side and output side discs are formed in concave faces respectively of circular arc shaped cross section, and the peripheral surface of each power roller is formed in a spherical convex surface. The peripheral surface and the inner side face abut each other. The thrust rolling bearing 32 is formed of high carbon chromium bearing steel and subjected to carbonitriding.

37. 发明专利

JP2002130411A TOROIDAL TYPE CONTINUOUSLY VARIABLE TRANSMISSION 失效
公开(公告)号：JP2002130411A
公开(公告)日：2002-05-09
申请号：JP2000321438
申请日：2000-10-20
申请人： NSK LTD
发明人： YOSHIKAWA TOMONOBU , MURAKAMI YASUO
IPC分类号： C21D7/06 , F16H15/38 , F16H55/32
摘要： PROBLEM TO BE SOLVED: To improve the durability of a disk and a power roller. SOLUTION: This toroidal type continuously variable transmission is constituted of an input shaft 3, an input side disk 1, an output side disk 2, a plurality of trunnions 10 and 11, a plurality of power rollers 7a and 7b, and a thrust roller bearing. The opposite inside surfaces of the both input side and output side disks are made into arc recessed cross-sectional shapes, circumferential surfaces of the respective power rollers 7a and 7b are made into spherical projecting surfaces, and the circumferential surfaces and the inside surfaces are made to abut to each other. This transmission is characterized in that, at least, one of the recessed surface of the input side disk 1, recessed surface of the output side disk 2, the projecting surfaces of the power rollers 7a and 7b, a track surface of an inner ring of a power roller bearing, and a track surface of an outer ring of the power roller bearing is ground, subjected to the superfinishing after the heat treatment, subjected to shot peening and subjected to the superfinishing, and the surface residual compression stress is -780--1800 MPa.

38. 发明专利

JP2001221238A ROLLING BEARING 失效
公开(公告)号：JP2001221238A
公开(公告)日：2001-08-17
申请号：JP2000033923
申请日：2000-02-10
申请人： NSK LTD
发明人： TAKEMURA HIROMICHI , KIUCHI AKIHIRO , MURAKAMI YASUO
IPC分类号： C22C38/00 , C22C38/02 , C22C38/40 , C22C38/58 , F16C33/62
摘要： PROBLEM TO BE SOLVED: To elongate a service life of a rolling bearing used under high- vibration and heavy-load environment such as an alternator bearing. SOLUTION: In this bearing, a steel material of an outer ring 2, i.e., a fixed ring, contains 0.40-1.20 wt.% C, 0.7-2.0 wt.% Si and/or Al, 0.2-2.0 wt.% Mn, 0.1-3.0 wt.% Ni and 3.0-9.0 wt.% Cr. The steel material has 9.0-17.0 wt.% chromium equivalent represented by formula: Cr equivalent= [Cr]+2[Si]+1.5[Mo]+5[V]+ 5.5[Al]+1.75[Nb]+1.5[Ti]. A raceway surface has a hardness above 57 HRC, minute carbide (of a diameter of 50-500 nm) is dispersively precipitated in the raceway surface, and a maximum diameter of the carbide is less than 10 μm.

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