Ntn Corporation

Honda Motor Co., Ltd.

Akihiko Katayama

Katsufumi Abe

Shinji Oishi

Noriaki Fujii

Yugo Yoshimura

Keiko Yoshida

Tomoya Fujimoto

Yasuyuki Watanabe

Kiminori Komura

Masaru Kuroda

Hiroki Tsuchiyama

Haruki Yamada

Kazuto Abe

Hisataka Hasegawa

Takayasu Takubo

Yoshiyasu Nakano

Takayuki Owada

Naoki Shibamoto

Takanori Terada

A preload inspection method for a bearing device for a vehicle wheel comprises: a first bearing preload value calculation step for calculating a first bearing preload value; a first rotating torque measurement step for measuring a first rotating torque; a caulking step for swaging the small-diameter stepped part to the inner ring; a second bearing preload value calculation step for calculating a second bearing preload value; a second rotational torque measurement step for measuring a second rotational torque; a third bearing preload value calculation step for calculating a third bearing preload value by adding, to the first bearing preload value, a preload change amount based on a differential torque between the first rotating torque and the second rotating torque; and a determination step for determining the suitability of the preload from the second bearing preload value and the third bearing preload value.

Preload inspection method and assembly method for bearing device for vehicle wheel

A roller bearing () includes a plurality of needle rollers (), a cage () that retains the rollers (), and an outer ring () that has a rolling surface on which the rollers roll and is split in the circumferential direction. The cage () includes split sections (), () at which the cage can be split in the circumferential direction. The cage () is of a roller riding type or an inner land riding type.

Roller bearing and shaft support structure

A cam follower for a rocker arm includes a cylindrical outer ring () having an outer circumference surface abutting on a cam, a support shaft () to support the outer ring (), a plurality of rollers () arranged in an annular region between the support shaft () and the outer ring (), and a side plate () composed of a ring-shaped disk penetrated by the support shaft (), opposed to an end face () of the roller (), and having an outer diameter Ds smaller than an inner diameter Dr of the outer ring (). The side plate () is arranged at each end of the roller (), and a relationship Lr&#x3c;Lk+2t is satisfied in which Lk represents a shaft length of the roller (), Lr represents a shaft length of the outer ring (), and t represents a thickness of the side plate ().

Cam follower for rocker arm and cam follower device

A rocking bearing outer ring () includes an arcuate track member () having a track surface on its inner diameter surface, and a flange portion () projecting radially inward from each widthwise end portion of the track member (). In addition, when it is assumed that Lrepresents a circumferential length of the track member () and Lrepresents a circumferential length of the flange portion (), 0.2&#x2266;L/L&#x2266;8 is satisfied.

Rocking bearing outer ring, rocking bearing, air disc brake device, and fitting structure of rocking bearing outer ring

A needle roller bearing () as a roller bearing comprises an outer ring () having a plurality of outer ring members () and () split by a split line extending in the axial direction of the bearing, and a plurality of needle rollers () arranged along the track surface of the outer ring (). The outer ring member () is in the form of a semicircular shape having a center angle of 180&#xb0; and has an engagement click () bent from one circumferential side end to the radial outer side. The two outer ring members () and () are connected in the circumferential direction to form the annular outer ring ().

Roller bearing, cam shaft support structure, internal combustion engine,  and incorporation method of roller bearing

Needle roller bearing includes an outer ring having first outer ring member having center angle larger than 180&#xb0; and second outer ring member having center angle smaller than 180&#xb0;, needle rollers, a retainer having ring section pairs and column sections arranged between the pair of ring sections, d&#x3c;X&#x3c;D and the formula below are satisfied wherein D represents the outer ring inner diameter, r represents a needle roller radius, d represents the retainer outer diameter, and X represents a line segment length lconnecting circumferential ends of an inner diameter surface of the first outer ring member. When line lpassing through the center of the outer ring and parallel to segment lpasses through the column section, &#x3b8; represents an angle between lines land lconnecting the center of the needle roller adjacent to the column section to the center of the outer ring, 

Needle roller bearing and crankshaft support structure

An outer ring for rocking bearing () includes a raceway surface () on the inner diameter side and has flange parts () and () provided by bending both axial ends to the inner diameter side. The flange parts () and () are provided with bent parts () and () axially bent toward the raceway surface () side so as to enfold a retainer arranged on the inner diameter side. Thus, the retainer can be enfolded by the bent parts () and (). Therefore, even when the retainer comes to be moved to the inner diameter side of the outer ring for rocking bearing (), the retainer is caught by the bent parts () and (), so that the movement of the retainer to the inner diameter side is restricted and rollers and the retainer can be prevented from dropping off.

Rocker bearing with outer ring and air disk brake system

A needle roller bearing () as a roller bearing comprises an outer ring () formed by connecting a plurality of arc-shaped outer ring members in a circumferential direction, and a plurality of needle rollers () arranged along the inner diameter surface of the outer ring (), and an oil groove () extending in a circumferential direction so as to contain a position opposed to an opening () of an oil path of a housing is formed in the outer diameter surface of the outer ring member.

Roller bearing, camshaft support structure, and internal combustion engine

A needle roller bearing comprises an outer ring having a plurality of outer ring members split by a parting line extending in the axial direction of the bearing, a plurality of needle rollers rotatably arranged on the raceway surface of the outer ring, and a retainer retaining the plurality of needle rollers. A curvature radius rof the outer ring member and a curvature radius rof the outer diameter of the retainer has a relation such that 1&#x3c;r/r&#x3c;1.3.

Needle roller bearing and bearing structure

A needle roller bearing comprises an outer ring having a plurality of outer ring members split by split lines extending in an axial direction of the bearing, a plurality of needle rollers arranged on an orbit surface of said outer ring so that they can roll thereon, and a cage holding the needle rollers at intervals. The outer ring member has a projection serving as a positioning engaging part which engages with a housing for positioning, and an engaging click protruding from an axial end of the outer ring member inward along a diameter to prevent the cage from moving in an axial direction, in positions shifted from its circumferential center.

Needle roller bearing

A rolling bearing comprises a roller, a roller shaft provided inwardly of the roller, and rolling elements provided between the roller and the roller shaft, the roller shaft having a nitrogen-rich layer and is configured such that its race surface, on which the rolling elements run, has not smaller than 11 in the JIS austenite grain size number and not smaller than HV653 in the Vickers hardness number, at both ends not greater than HV300, and at its core beneath a widthwise midpoint of the race surface not smaller than HV550.

Rolling bearing

A rolling bearing for a rocker arm includes an outer ring in rolling contact with a cam of an engine, an outer-ring shaft placed inside the outer ring and fixed to the rocker arm, and a plurality of rollers provided between the outer ring and the outer-ring shaft. At least one of the outer ring, the outer-ring shaft and the rolling elements has a nitrogen-rich layer, an austenite crystal grain size number in a range exceeding 10, and a surface hardness Hv of at least 653. Thus, the life can be extended.

Growing community of inventors

Iwata, Japan

Akihiko Katayama