Ntn Corporation

Isuzu Motors Limited

Takashi Tsujimoto

Kikuo Maeda

Rino Fukami

Yuji Okamoto

Mamoru Mizutani

Yasuhiro Kanbori

Takashi Ito

Shinji Oishi

Akio Kato

Masafumi Taki

Tatsuya Omoto

Takashi Ueno

Yasuhiro Shimizu

Yasuhiko Shimizu

Tsukasa Yamakawa

Goro Nakao

Shiro Ishikawa

Seiji Kanbara

Makoto Okasaka

Junichi Hattori

Kimihiro Hanai

Kazufumi Nakagawa

Kouji Masuoka

Yuuji Okamoto

Jiro Mochizuki

Hiroyuki Ichikawa

Kazunori Urakami

Kazumi Adachi

Masafumi Isuzu Motors Limited Taki

A chain guide includes roller element bearings adapted to guide, while rolling, a timing chain through which torque is transmitted. The chain guide further includes a guide base arranged along one side of the timing chain and having an opposed pair of side plates. Each side plate is formed with plural shaft engaging portions arranged so as to lie on a circular arc. The chain guide further includes roller shafts having their ends supported by the respective shaft engaging portions, and rotatably supporting the roller element bearings. An oil guide hole is formed in a wall surface of each shaft engaging portion facing the end surface of the roller shaft so as to extend through the side plate to its outer side surface.

Chain guide and chain transmission device

The surfaces () of at least rolling elements () of a roller bearing for transmissions or differentials of automobiles are provided with innumerable minute, recess-shaped cavities at random and the surface roughness parameter Ryni of the surfaces provided with the cavities is in the range of 0.4-1.0 &#x3bc;m and the Sk value is not more than &#x2212;1.6.

Roller bearing for automobiles

At least the surfaces of rolling elements of a rolling bearing are each randomly formed with an innumerable number of microconcave-like pits. The surface roughness parameter Ryni of the surfaces provided with the pits is in a range of 0.4 to 1.0 &#x3bc;m, and the Sk value is &#x2212;1.6 or below.

Rolling bearing

A tapered roller bearing is used in transmissions or differentials for automobiles. The tapered roller bearing includes an inner ring, an outer ring, a plurality of tapered rollers rollably disposed between the inner and outer rings, and a cage for holding the tapered rollers at circumferential predetermined intervals. The roller coefficient &#x3b3; exceeds 0.94, where &#x3b3; is (the number of rollers&#xd7;mean roller diameter)/(&#x3c0;&#xd7;PCD).

Tapered roller bearing

A tapered roller bearing is capable of suppressing the occurrence of fretting without shortening its fatigue life. The tapered roller bearing includes an outer race, an inner race, a plurality of taper rollers interposed between the outer race and the inner race, and a retainer for retaining the tapered rollers. The tapered roller bearing is used in an idler portion of an automobile transmission, which is interchanged between an idle state in which the outer race idles with respect to the inner race and a shift state in which the outer race and the inner race are rotated synchronously with each other. A ratio of &#x3b1;/&#x3b2;&#x2267;4.9 is established on a premise that an outer-race raceway surface angle is 2&#x3b1; and a roller angle is &#x3b2;.

At least on a surface of a rolling element of a rolling bearing, innumerable minute concave recesses are randomly formed. An area percentage of the recesses on the surface having the recesses formed thereon is in a range from 5 to 20%, and a surface roughness parameter Rymax of the surface having the recesses formed thereon is in a range of 0.4 to 1.0.

A tapered roller bearingcomprises an inner ring, an outer ring, a plurality of tapered rollersrollably disposed between the inner and outer ringsand, and a cagefor holding the tapered rollersin predetermined circumferentially spaced relation, wherein the roller coefficient exceeds 0.94, and with the cagepositioned at the axial center, there is a clearance between the cage and the raceway surface of the outer ring, and the roller abutting width of the pocket pole surface is secured across 10% or more of the pocket length axially from the central position of the pocket.

A tapered roller bearing includes an inner ring, an outer ring, a plurality of tapered rollers which are rollably disposed between the inner ring and the outer ring, and a retainer which retains the tapered rollers at predetermined circumferential intervals. In this tapered roller bearing, a roller coefficient &#x3b3;=(the number of rollers&#xd7;average roller diameter) exceeds 0.94, a number of indentations having a micro recess-like shape are randomly provided at least on a surface of the tapered roller, a surface roughness parameter Ryni of the surface having the indentations falls within a range of 0.4 &#x3bc;m&#x2266;Ryni&#x2266;1.0 &#x3bc;m, and an Sk value is &#x2212;1.6 or less.

A tapered roller bearing comprises an inner ring having a conical surface-like raceway surface in it outer periphery and formed with a cone back face rib and a cone front face rib on the opposite sides of the raceway, an outer ring having a conical surface-like raceway in its inner periphery, a plurality of tapered rollers interposed between the raceways of the inner and outer rings, and a cage for holding the tapered rollers in predetermined circumferential intervals, wherein the ratio R/Rof the radius of curvature R of the large end face () of the tapered roller () to the distance Rfrom the apex of cone of the tapered roller () to the cone back face rib surface () of the inner ring () is set at 0.75 to 0.87, and the end face deflection of the large end face () of the tapered roller () is 3 &#x3bc;m or less.

A tapered roller bearing has an increased load capacity and has a decreased maximum face pressure on the raceway surfaces without lowering the rigidity of the cage. The tapered roller bearing includes an inner ring, an outer ring, multiple tapered rollers rollably disposed between the inner ringand the outer ring, and a cage for holding the tapered rollers at predetermined circumferential intervals, wherein the roller coefficient &#x3b3; thereof is larger than 0.94. Herein, &#x3b3;=(the number of the rollers&#xd7;the average diameter of the rollers)/(&#x3c0;&#xd7;PCD).

A tapered roller bearing () comprises an inner ring (), an outer ring (), a plurality of tapered rollers () rollably disposed between the inner and outer rings () and a cage () for holding the tapered rollers () at predetermined circumferential intervals, wherein (the circumferential length on the PCD)&#x2212;(roller diameter&#xd7;the number of rollers)&#x3c;roller diameter. Further, the tapered rollers () are uniformly disposed such that the distance between rollers on the PCD is less than (the roller diameter/the number of rollers).

A sealed rolling bearing includes an inner ring and an outer ring defining a bearing space therebetween. Axially inner and outer contact seals are provided on each side of the bearing space to seal the bearing space. The axially outer contact seals stop any splashed muddy water, thereby keeping the lips of the axially inner contact seals and their sliding contact surfaces free of muddy water. This prevents the lips of the axially inner contact seals and their sliding contact surfaces from becoming worn by muddy water. The axially inner contact seals thus maintain high sealability even if the bearing is used in environments where muddy water splashes.

Sealed rolling bearing

A tapered roller bearing includes a retainer formed with a plurality of trapezoidal pockets. Each pocket includes cutouts formed in the crossbars defining each pocket near the narrow end thereof. A tapered roller is received in each pocket with its small-diameter end facing the narrow end of the pocket. Lubricating oil flowing into the bearing space defined radially inwardly of the retainer can quickly flows through the cutouts into the bearing space defined radially outwardly of the retainer at the narrow end of each pocket. Thus, it is possible to reduce the amount of lubricating oil flowing along the raceway of the inner ring to the large-diameter flange, and thus reduce the amount of lubricating oil remaining in the bearing, thereby reducing the torque loss due to rotational resistance of the bearing resulting from lubricating oil remaining in the bearing.

A tapered roller bearingcomprises an inner ringan outer ringa plurality of tapered rollersrollably disposed between the inner and outer rings, and a cagefor holding the tapered rollers at predetermined circumferential intervals. In this tapered roller bearing, the roller coefficient {y=(the number of rollers &#xd7;mean roller diameter)/(&#x3c0;&#xd7;PCD)} is greater than 0.94. At least one of the members, i.e., the outer ring, inner ring, and rolling elements, has a nitrogen rich layer. The grain size number of austenite crystal grains in the nitrogen rich layer exceeds number

A tapered roller bearing and an automotive gear shaft support device can ensure a long endurance life even in the state in which debris is mixed. On the surfaces of an outer ring, inner ring, and tapered rollers formed from carburized bearing steel having an oxygen content of 9 ppm or less, carbo-nitrided layers having a carbon content of 0.80 wt % or over, a Rockwell hardness HRC of 58 or over, and a residual austenite content of 25&#x2013;35 vol % are formed to increase mechanical properties and fatigue characteristics of the parts and to stably maintain the carbo-nitrided layers on the surfaces of the parts to a quality having suitable toughness, thereby markedly improving the endurance life of the tapered roller bearing in a state in which debris is mixed.

Growing community of inventors

Iwata, Japan

Takashi Tsujimoto