Jtekt Corporation

Koyo Seiko Company, Ltd.

Hiroki Matsuyama

Kazutoshi Toda

Hiroyuki Chiba

Kiyoshi Ogino

Kouji Kawaguchi

Hiroyuki Ohshima

Naoki Masuda

Akiyuki Suzuki

Yuzuru Takahashi

Hirofumi Dodoro

Koji Kawaguchi

Yasunari Abo

Hiroshi Ueno

Shigeo Kamamoto

Seiji Nakahama

Masahiro Harada

Junji Murata

Keiichi Furukawa

Takashi Sada

Tomoya Hattori

Kanichi Kouda

Kazuhisa Kajihara

Shinya Matsuda

Michiru Ueda

Liming Lou

Naoto Araki

Tomohiro Haruta

Yoshio Tateishi

Koshiro Yamakawa

A tapered roller bearing includes: an inner ring; an outer ring provided on an outer peripheral surface of the inner ring via an annular space so as to be disposed on the same center line as the inner ring; a plurality of tapered rollers rollably disposed in the annular space; and a cage retaining the plurality of tapered rollers. The tapered roller bearing is configured such that: liquid lubricant flows through the annular space; and among the inner ring, the outer ring, the tapered rollers, and the cage, at least one rotating component configured to rotate at the time of bearing rotation is provided with a vaporization promotion mechanism configured to decrease a pressure of the lubricant at the time of bearing rotation so that the pressure of the lubricant reaches a saturation vapor pressure at which the lubricant changes from a liquid phase to a vapor phase.

Tapered roller bearing and power transmission device using tapered roller bearing

A liquid lubricating tapered roller bearing device, includes: an outer ring; an inner ring including an outer end surface at a smaller diameter side; tapered rollers; and a cage located further inside in an axial direction than the outer end surface of the inner ring and including an end portion at a smaller diameter side, the end portion defining an outer end surface and an inner periphery. Inequalities X/B&#x2267;0.010 and 0.009&#x2266;X/D&#x2266;0.043 are satisfied where B represents a width in the axial direction of the inner ring; D represents a bore diameter of the inner ring; Xrepresents a distance in the axial direction from the outer end surface of the inner ring to the outer end surface of the case; and Xrepresents a dimension of a clearance in a diameter direction between the inner periphery of the cage and the inner ring.

Liquid lubricating tapered roller bearing device

A tapered roller bearing according to the present invention, in which the rolling surface of a tapered roller and raceway surfaces of internal and outer rings undergoes crowning. The total crowning amount of that crowning and the crowning amount of each raceway surface and rolling surface are set to preferred values. This allows reduction of the rolling friction of the internal and outer rings and the tapered roller, and the rotation torque of the tapered roller bearing according to the present invention.

Tapered roller bearing

A tapered roller bearing includes an outer ring, an inner ring, a plurality of tapered rollers interposed between the outer ring and the inner ring, and a cage for the tapered rollers. Ra is smaller than Rb where Ra represents a radius of curvature of a large end face of the tapered roller and Rb represents a radius of curvature of an end face of a large rib portion of the inner ring.

Tapered roller bearing, tapered roller bearing apparatus, and automotive pinion shaft supporting apparatus utilizing same tapered roller bearing apparatus

A tapered roller bearing includes: an oil guide member that opens and closes an annular opening between an outer peripheral surface of a large rib of an inner ring and an outer ring and is mounted on the large rib; and a discharge port that discharges, along the outer peripheral surface of the large rib, lubricating oil and is formed through an inner peripheral portion of the oil guide member. The oil guide member includes a closing portion for closing the annular opening. When a fluid pressure of the lubricating oil which flows through pockets of a cage toward an inner peripheral surface of the outer ring is below a predetermined values, the closing portion closes the annular opening and guides the lubricating oil toward the discharge port. When the fluid pressure exceeds the predetermined value, the closing portion opens the annular opening.

A roller bearing assembly is provided which is adapted to enhance lubrication performance for preventing seizure and for reducing frictional torque during rotation. The roller bearing assembly includes an inner ring (), an outer ring () and a roller () rollably interposed between these inner and outer rings. The inner ring () is formed with a rib () making contact with a greater end face () of the roller () for guiding the rolling motion of the roller (). A recess () is formed centrally of the greater end face () of the roller (). A stopper member () for preventing oil invasion is fitted in the recess () of the roller ().

Oil-lubricated roller bearing assembly

A tapered roller bearing according to the invention is such that when an arithmetical mean roughness as a surface roughness of a large end face of a tapered roller is &#x3c3;1 and an arithmetical mean roughness as a surface roughness of a large rib surface of an inner ring is &#x3c3;2, &#x3c3;1 is 0.04 &#x3bc;m or larger, and

Tapered roller bearing and automotive pinion shaft supporting apparatus utilizing same tapered roller bearing

In a tapered roller bearing, LWR/DW is in the range of 1.1 to 1.7 where LWR represents a roller effective length of tapered rollers and DW represents a roller mean diameter of tapered rollers. RCO/LRO is 30 to 150, and RCI/LRI is 50 to 260 where RCO represents a crowning radius of an outer ring, LRO represents a raceway length of the outer ring, RCI represents a crowning radius of an inner ring and LRI represents a raceway length of the inner ring. The following expressions are satisfied: 20&#xb0;&#x2266;&#x3b1;&#x2266;30&#xb0;, and &#x3b1;&#x2212;0.87&#x3b3;&#x2212;0.334&#x2266;BK&#x2266;&#x3b1;&#x2212;0.87&#x3b3;&#x2212;0.167, where &#x3b1; represents a raceway angle of the outer ring, &#x3b3; represents a roller angle of the tapered rollers, and BK represents a rib angle of a large rib portion of the inner ring.

A tapered roller bearing is designed to have a roller loading ratio in the range of 0.7 to 0.92 and a ratio of roller length to roller diameter in the range of 1.1 to 1.7 whereby oil agitation loss and rolling viscous resistance are reduced for achieving the reduction of running torque. Crownings are provided which are designed to have an outer-ring crowning parameter (=RCO/LRO) in the range of 30 to 150 and an inner-ring crowning parameter (=RCI/LRI) in the range of 50 to 260, provided that RCO denotes the radius of an outer ring crowning, LRO denotes the raceway length of an outer ring, RCI denotes the radius of an inner ring crowning and LRI denotes the raceway length of an inner ring. Thus, the rolling viscous resistance is reduced for achieving the reduction of running torque.

Tapered roller bearing, a tapered roller bearing assembly and a pinion-shaft supporting assembly using the same

A shielding plate for controlling the entry of oil between an inner ring and an outer ring is provided in the vicinity of an opening between the inner ring and the outer ring which lies a side where oil enters. In addition, a fluid accommodating plate for accommodating therein oil is provided in the vicinity of an opening between the outer ring and the inner ring which lies on a side where oil exits.

Fluid-lubricated type tapered roller bearing device and vehicle pinion shaft supporting assembly

A tapered roller bearing according to the invention is such that the surface hardnesses of a raceway surface of an inner ring and rolling contact surfaces of tapered rollers are set to 63 to 69HRC. In addition, respective raceway surfaces of an outer ring and the inner ring and the rolling contact surfaces of the tapered rollers are crowned and are set such that a total crowning amount is 50 &#x3bc;m or larger, an outer crowning rate is 40% or larger and a roller crowning rate is 20% or smalled.

Tapered roller bearing an automotive pinion shaft supporting apparatus utilizing same tapered roller bearing

According to the invention, there is provided a tapered roller bearing in which, where D represents a larger end diameter of the tapered roller and L represents a roller length thereof, the roller length L is 18 mm or smaller, and a ratio of the large end diameter and the roller length of the tapered roller which is expressed by D/L is in the range of 0.55 to 0.9. In addition, respective raceway surfaces of the outer ring and the inner ring and rolling contact surfaces of the tapered rollers are crowned, and a total crowning amount is set to be 50 &#x3bc;m or larger, an outer ring crowning rate is set to be 40% or larger, and a roller crowning rate is set to be 20% or smaller.

An end faced on an outer side in a radial direction of a small diameter annular portion of a retainer is disposed on an inner side in a radial direction of a pitch conical face of a taper roller and an end face on an inner side in a radial direction of a large diameter annular portion is disposed on an outer side in the radial direction of the pitch conical face. Further, a portion of the small diameter annular portion opposed to a small diameter end face of the taper roller is disposed on the inner side in the radial direction of the pitch conical face and a portion of the large diameter annular portion opposed to a large diameter end face of the taper roller is disposed on the outer side in the radial direction of the pitch conical face.

Taper roller bearing

A tapered roller bearing includes: an outer race including an outer raceway surface; an inner race including an inner raceway surface and a larger collar surface which is a concave curved surface; and tapered rollers provided between the outer and inner races, each of the tapered rollers including a tapered surface and a larger end surface which is a convex curved surface communicating with the tapered surface and corresponds to the larger collar surface.

Tapered roller bearing and final reduction gear

In order to improve a seizure resistance as well as restricting of a dispersion of a rotation torque, surface roughness of a large diameter side end face (A) of a tapered roller () is defined as a value satisfying both the following conditional expressions (1) and (2).0.04 &#x3bc;m&#x2266;()&#x2266;0.1 &#x3bc;m&#x2003;&#x2003;(1)0.8&#x2266;()/()&#x2266;1.1&#x2003;&#x2003;(2)where, Ra(r) is an arithmetic average of roughness in a radial direction on the large diameter side end face of the tapered roller, and Ra(c) is an arithmetic average of roughness in a peripheral direction on the large diameter side end face of the tapered roller.

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Nara, Japan

Hiroki Matsuyama