Jtekt Corporation

Yuki Shishihara

Shigeo Kamamoto

Junji Murata

Seiji Nakahama

Kunishige Nakazawa

Yuichi Miura

Tomohiko Haruyama

Daisuke Ozaki

A cage and roller assembly includes a plurality of rollers to be brought into rolling contact with a raceway surface provided on the outer periphery of a shaft, and an annular cage that retains the rollers. Lubricating oil is supplied through an oil supply hole that is provided inside the shaft and is open at the raceway surface. The cage includes a pair of annular portions, and a plurality of cage bars that couple the annular portions together and are arranged with intervals in a circumferential direction. The rollers are housed in pockets each formed between the pair of annular portions and between the cage bars that are adjacent to each other in the circumferential direction. The cage has an inner recessed groove that is provided on a radially inner surface of the cage bar and extends through the annular portions in an axial direction.

Cage and roller assembly

A rolling bearing includes a first raceway surface; a second raceway surface; and a plurality of rolling elements rotatably arranged between the first raceway surface and the second raceway surface. Multiple recesses are provided on at least one surface among the first raceway surface, the second raceway surface, and rolling surfaces of the plurality of the rolling elements. An area ratio of openings of the recesses to the at least one surface is in a range of 5% to 37%. An equivalent circle diameter of the opening of each of the recesses is in a range of 1 &#x3bc;m to 27 &#x3bc;m. A depth of each of the recesses in a direction normal to the at least one surface is in a range of 3 &#x3bc;m to 10 &#x3bc;m. A surface waviness of the at least one surface excluding the recesses is smaller than or equal to 0.2 &#x3bc;m.

Rolling bearing

A thrust roller bearing includes a plurality of rollers and a cage including a plurality of cage pockets for housing the rollers. The rollers each include a cylindrical portion, an outer crowning portion, and an inner crowning portion. The cage pockets each include an outer surface, an inner surface facing a second end surface of the roller, and a pair of side surfaces facing an outer peripheral surface of the roller. The side surfaces each include a recessed surface that is not contactable with the roller, and flat surfaces that are provided on the outer side in the radial direction and on the inner side in the radial direction, respectively, and are contactable with the roller. A first dimension is larger than a second dimension.

Thrust roller bearing

A thrust roller bearing includes a plurality of rollers and a cage. Each cage pocket includes a first side surface, and a second side surface. The roller and the cage are configured to satisfy the following expression (1).(1+2)/&#x3c;tan(3&#xd7;&#x3c0;/180)&#x2003;&#x2003;(1)Y1 represents a clearance, before skewing, between a first contact point of the roller at which the roller contacts the first side surface when the roller is skewed toward one side and the first side surface, Y2 represents a clearance, before skewing, between a second contact point of the roller at which the roller contacts the second side surface when the roller is skewed toward the one side and the second side surface, and X represents a difference between the radius of a first imaginary circle passing through the first contact point and the radius of a second imaginary circle passing through the second contact point.

A needle roller thrust bearing includes an annular cage and a plurality of rollers. The cage includes a plurality of cage pockets that is radially disposed. The plurality of rollers is housed in the cage pockets and disposed between a first raceway surface and a second raceway surface that axially face each other. Lubricating oil flows from a radially inner side to a radially outer side in an annular space in which the cage and the rollers are provided. The cage includes inner grooves and drainage grooves. Each of the inner grooves connects a circumferentially adjacent pair of the cage pockets by connecting radially inner areas of the pair of cage pockets. Each of the drainage grooves has an opening at an outer circumferential surface of the cage to drain lubricating oil in a circumferential area including radially outer areas of the cage pockets.

Needle roller thrust bearing

A cage and roller assembly includes rollers and an annular cage. The cage includes annular portions having guide surfaces and cage bars that couple the annular portions together. Each of the cage bars includes a cage bar body provided in an axial center portion of the cage bar and having an oil reservoir bottom face on a radially outer side of the cage bar body, the oil reservoir bottom face located on a radially inner side with respect to the guide surface, and a detachment preventing portion provided at both axial ends of the cage bar body and having an outer claw that covers a part of the roller from the radially outer side. The detachment preventing portion is provided with an outer recessed groove configured as a passage for causing lubricating oil to flow toward the guide surface from the oil reservoir bottom face through the detachment preventing portion.

A cage and roller assembly includes rollers to be brought into rolling contact with a raceway surface provided on the outer periphery of a shaft, and an annular cage that retains the rollers. Lubricating oil is supplied through an oil supply hole that is provided inside the shaft and is open at an axial center region of the raceway surface. The cage includes annular portions having guide surfaces that are brought into contact with an inner peripheral surface of an outer member that is brought into rolling contact with the rollers, and cage bars that couple the annular portions together and are arranged with intervals in a circumferential direction. Clearances formed between the cage bars and the rollers housed in the pockets are larger in axial center portions of the cage bars between axial ends of the cage bars than at the axial ends of the cage bars.

A bearing includes a cage and rollers disposed between a first raceway surface and a second raceway surface axially facing each other. The cage includes a first guide surface and a second guide surface. The first guide surface is provided on a radially outer portion of the cage, and contacts the first raceway surface when the cage is displaced toward the first raceway surface. A clearance formed between the first guide surface and the first raceway surface is smaller than a clearance at a radially inner portion of the cage. The second guide surface is provided on a radially outer portion of the cage, and contacts the second raceway surface when the cage is displaced toward the second raceway surface. A clearance formed between the second guide surface and the second raceway surface is smaller than a clearance at a radially inner portion of the cage.

A taper roller bearing includes: an inner ring, an outer ring, a plurality of taper rollers, and an annular cage. The cage includes a small-diameter annular portion on one axial side, a large-diameter annular portion on the other axial side, and a plurality of column portions. A radial inner surface of the column portion is provided along a second virtual taper surface that is in the vicinity of a first virtual taper surface including a center line of the plurality of taper rollers, across the entire length in the longitudinal direction of the column portion.

Taper roller bearing

A tapered roller bearing includes an inner ring, an outer ring, a plurality of tapered rollers, and an annular cage that holds the tapered rollers. The cage has a small annular portion positioned toward the axially first side with respect to the tapered rollers, a large annular portion positioned toward the axially second side with respect to the tapered rollers, and a plurality of cage bars that couples the small annular portion and the large annular portion together, and the cage is enabled to come into contact with an inner peripheral surface of the outer ring so that the contact allows the cage to be positioned in a radial direction. The small annular portion is provided with introduction channels through which lubricant is enabled to be introduced from a bearing exterior on the axially first side into an annular space formed between the inner and outer rings.

Tapered roller bearing

A cage of a ball bearing includes an annular portion located on a first axial side with respect to balls, the first axial side being one side in an axial direction of the ball bearing, and cage bars extending from the annular portion toward a second axial side, the second axial side being the other side in the axial direction of the ball bearing. A space located on a second axial side of the annular portion and defined between any two of the cage bars adjacent to each other in a circumferential direction serves as a pocket that accommodates a corresponding one of the balls. The pocket has a contact surface that is brought into point contact with the ball at an intersection point between a rotational center axis of the ball and a surface of the ball when the cage is displaced toward the second axial side.

Ball bearing

A cage made of a resin includes: a small-diameter annular portion on one side in an axial direction; a large-diameter annular portion on the other side in the axial direction; and a plurality of column portions which link the small-diameter annular portion and the large-diameter annular portion to each other. Spaces which are formed between the large-diameter annular portion and the small-diameter annular portion and between the column portions adjacent to each other in the circumferential direction are pockets which hold the taper rollers. A surface of the entire cage including the small-diameter annular portion, the large-diameter annular portion, and all of the column portions is configured by aggregating a surface viewed from the one axial side and a surface viewed from the other axial side.

Cage for taper roller bearing and taper roller bearing

An annular cage provided with a taper roller bearing includes: a small-diameter annular portion, a large-diameter annular portion, and a plurality of column portions which link the small-diameter annular portion and the large-diameter annular portion to each other, and further includes roller retaining portions which prevent taper rollers accommodated in pockets from falling out to the outer side in the radial direction. Each of the roller retaining portions has a shape of a protruding beam that is a fixed end on the column portion side and on the small-diameter annular portion side, extends in the circumferential direction and in a column portion longitudinal direction, and is a free end on the tip end side in the extending direction.

A taper roller bearing includes: an inner ring, an outer ring, a plurality of taper rollers in which a cavity portions are formed on a large end surface, and an annular cage. The cage includes a small-diameter annular portion on one axial side, a large-diameter annular portion which is positioned on the other axial side and on the outer side in the radial direction of the large flange, and a plurality of column portions. An outer diameter of an axial inner surface included in the large-diameter annular portion is greater than a diameter of a virtual circle that links outer end portions in the radial direction of the cavity portions of the plurality of taper rollers.

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Kashiwara, Japan

Yuki Shishihara