438results about "Needle bearings" patented technology

A cage, rollers and solid lubricant are all formed integrally into a complete unitary molding with using difference in thermal expansion in a mold. Assembling the complete unitary molding into the race in the rolling-contact bearing is made easier. The complete unitary molding is made such that the rollers remain exposed partially at their rolling surfaces above the inside circular surface of the complete unitary molding while the solid lubricant on the outside circular surface of the complete unitary molding is squeezed out from between the rolling surfaces of the rollers and the inside circular surface of the outside mold upon molding operation, thereby getting the rolling surfaces of the rollers exposed partially. The mold is composed of an outside mold, an inside mold and an intermediate mold, which is made of a substance larger in thermal expansion than other substance for the outside and inside molds.

A component of a crank mechanism is incorporated in the crank mechanism that converts reciprocating motion of a piston to rotary motion by means of a crank pin, a crank arm and a crank shaft via a connecting bar, and has a hydrogen content of no more than 0.5 ppm, austenite crystal grains of a grain size number exceeding 10, or a fracture stress value of no less than 2650 MPa. Thus, a support structure in and a component of a crank mechanism ensuring a long fatigue life, high anti-crack strength, and a reduced rate of secular dimensional change to improve dimensional stability, can be obtained.

A thrust needle roller bearing includes a plurality of needle rollers, and an annular retainer having a plurality of pockets for retaining the needle rollers. The plurality of pockets accommodate the needle rollers arranged in multiple rows shifted from each other in a radial direction of the retainer, and the retainer is made of synthetic resin. The thrust needle roller bearing is light, can reduce friction between the retainer and the needle rollers, and has high durability.

A split roller bearing device of the invention includes a roller bearing of which at least the outer ring is separated into a plurality of split parts and a cap member that fixes the outer ring of the roller bearing between the body shaft and a housing and the outer ring split part is fixed inside the arc-shaped recess of the cap member.

A component of a crank mechanism is incorporated in the crank mechanism that converts reciprocating motion of a piston to rotary motion by means of a crank pin, a crank arm and a crank shaft via a connecting bar, and has a hydrogen content of no more than 0.5 ppm, austenite crystal grains of a grain size number exceeding 10, or a fracture stress value of no less than 2650 MPa. Thus, a support structure in and a component of a crank mechanism ensuring a long fatigue life, high anti-crack strength, and a reduced rate of secular dimensional change to improve dimensional stability, can be obtained.

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.

A first race component includes a flat, circular raceway portion, defined about an axis, and an axially extending lip portion. A plurality of needle rollers is arranged radially with respect to the axis for rolling contact with the flat raceway. A bearing cage retains the needle rollers and is engageable with the lip portion of the first component for piloting of the bearing cage. A second race component, made of different material, includes a flat portion in contact with the raceway portion of the first race component and a lip portion extending axially and radially from the flat portion and beyond the lip portion of the first race component such that the second race component is engageable by the bearing cage to hold the first race component, the second race component and the bearing cage together as an assembly.

A composite roll bearing (1), comprising an outer ring (2) and an annular inner ring (3) of groove shape in cross section having first, second, and third receiving surfaces (3a, 3b, 3c) facing the both end face inner peripheral portions (2a, 2b) and the circular inner peripheral surface (2c) of the outer ring (2) at specified intervals. A plurality of rollers (4) for thrust bearing are installed between one end face portion (2a) of the outer ring (2) and the first receiving surface (3a) of the inner ring (3) and between the other end face (2b) of the outer ring (2) and the second receiving surface (3b) of the inner ring (3). A plurality of rollers (5) for radial bearing are installed between the circular inner peripheral surface (2c) of the outer ring (2) and the third receiving surface (3c) of the inner ring (3). The rollers (5) are restricted to move in a thrust direction by retainer portions (8a, 8a) formed at the inner ends of retainers (6, 7) for the rollers (4) for thrust bearing.

When assembling a roller bearing, the present invention effectively prevents rollers (R) assembled to the inside of an outer race (W) from tilting or dropping out from the state immediately after assembly. After arranging the rollers (R) in an annular shape by means of an arrangement jig (14), the roller group (G) arranged in an annular shape is ejected from the arrangement space (26) of the arrangement jig (14), and is pressed into a guide hole (39) of an insertion jig (15). As a result, in the state of inhibiting the diameter of the roller group (G) from widening by means of the inner peripheral surface of the guide hole (39), a holding member (36) made from an elastic material is inserted within the roller group (G) in the state of the holding member (36) being elastically compressed in diameter. Thereafter, an ejection tube (38) configuring the insertion jig (15) is displaced in the axial direction, simultaneously ejecting the roller group (G) and the holding member (36) from the guide hole (39), simultaneously assembling same within the outer race (W).

A roller bearing (needle roller bearing) of the cage-and-roller type for a planetary gear mechanism includes a plurality of rollers (needle rollers), and a cage positioning and holding these rollers, and an outside diameter surface of the cage is guided by a bore diameter surface of a planetary gear. An outside diameter dimension of the cage is set to a value which is not smaller than 95% and not larger than 97% of an inner diameter dimension of the planetary gear.

In a pin roller type pinion device, a first bearing has first pin needles rollably arranged around pin rollers between an inner surface of first circular holes and one end portion of the pin rollers. A second bearing has second pin needles rollably arranged around the pin rollers between an inner surface of second circular holes and the other end portion of the pin rollers. This prevents an external pressure from developing on the inner surface of the circular holes when inserting the pin needles between the inner surface of the circular holes and the end portions of the pin rollers.

A radial bearing (1a, 1b, 1c, 1d), especially a roller bearing (9) comprising an outer part (3) opposite an inner part (6), which rotate relative to each other about a common longitudinal axis (5) is provided, wherein the radial bearing (1a, 1b, 1c, 1d) includes a bearing seat (8a, 8b, 8c, 8d), which is formed in the outer part (3) or on the inner part (6) and which is generally stationary relative to a radial load (10a, 10b, 10c, 10d) acting on the bearing seat (8a, 8b, 8c, 8d) in a load zone (12a, 12b, 12c, 12d). The bearing seat (8a, 8b, 8c, 8d) features a variable width over its extent in a direction of the longitudinal axis (5), such that, starting from the load zone (12a, 12b, 12c, 12d), the bearing seat (8a, 8b, 8c, 8d) is significantly narrowed outside of the load zone (12a, 12b, 12c, 12d).

A bearing cage defines an overall axial length and includes a first end portion defining a first contact surface extending at a radially-outermost diameter of the bearing cage a first axial contact length, and a second end portion spaced a distance from the first end portion and defining a second contact surface extending at the radially-outermost diameter of the bearing cage a second axial contact length. The bearing cage further includes a plurality of spanning members extending between the first and second end portions to define a spanning member axial contact length defined at the radially-outermost diameter of the bearing cage by at least one contact pad. The bearing cage produces a total contact ratio, defined as the ratio of the sum total of the first axial contact length, the second axial contact length, and the spanning member axial contact length to the overall axial length, of at least 0.380.

In order to improve a surgical instrument comprising a shank and a drive shaft, which is rotatably mounted in the shank and bears or comprises a tool element at its distal end, wherein in the distal end region of the shank a radial bearing is arranged or configured for the rotatable mounting of the drive shaft on the shank, such that a reliable operation is possible even with increasing miniaturisation of the shanks, it is proposed that the radial bearing is configured in the form of a needle bearing.An improved surgical handpiece as well as an improved surgical drive system are additionally proposed.

In a planetary gearset and an automatic transmission according to the invention, a pinion shaft on which a pinion gear is rotatably supported includes a bearing portion on which a bearing is attached and a polygonal portion having a polygonal outer periphery. An axial oil passage and radial oil passages that communicate with the axial oil passage are formed in the polygonal portion, and the inlet of each radial oil passage formed in the pinion gear faces the polygonal portion.

A composite roll bearing (1), comprising an outer ring (2) and an annular inner ring (3) of groove shape in cross section having first, second, and third receiving surfaces (3a, 3b, 3c) facing the both end face inner peripheral portions (2a, 2b) and the circular inner peripheral surface (2c) of the outer ring (2) at specified intervals. A plurality of rollers (4) for thrust bearing are installed between one end face portion (2a) of the outer ring (2) and the first receiving surface (3a) of the inner ring (3) and between the other end face (2b) of the outer ring (2) and the second receiving surface (3b) of the inner ring (3). A plurality of rollers (5) for radial bearing are installed between the circular inner peripheral surface (2c) of the outer ring (2) and the third receiving surface (3c) of the inner ring (3). The rollers (5) are restricted to move in a thrust direction by retainer portions (8a, 8a) formed at the inner ends of retainers (6, 7) for the rollers (4) for thrust bearing.

A roller bearing retainer (13) includes a pair of annular ring parts (14) and a plurality of column parts (15) each including a column center part (16) provided in an axial center region so as to be positioned relatively on the radial inner side, a pair of column end parts (17) provided in axial end regions so as to be positioned relatively on the radial outer side, and a pair of column sloped parts (18) positioned between the column center part (16) and the pair of column end parts (17), and connecting the pair of ring parts to each other. A thickness of each part of the column center part, the pair of column end parts, and the pair of column sloped parts is smaller than a thickness of a boundary part between the adjacent parts.

A track roller assembly includes a split inner ring, a split outer ring, a one piece inner ring and / or a one piece outer ring and a liner or plurality of rolling elements engaging therewith, the track roller assembly being disposed in a structure of an Airbus A-350 aircraft, an Airbus A-320 aircraft, an Airbus A320Neo aircraft, an Airbus A330 aircraft, an Airbus A330Neo aircraft, an Airbus A321 aircraft, an Airbus A340 aircraft, and an Airbus A380 aircraft.

A roller assembly comprises a first race and a second race. The second race is coaxial with the first race and is axially movable relative to the first race. The first and second races are movable between a static axial position and a dynamic axial position relative to one another. The roller assembly includes at least one biasing member that is operative to bias the first and second races from the dynamic axial position toward the static axial position.

A method of producing thin-walled parts is characterized in that after being heated, a thin-walled part (1) is subjected to either hardening or isothermal transformation while being pressed in a mold (12a, 12b) with the latter being used as a cooling medium. This makes it possible to provide a method of producing thin-walled parts which can be prevented from warping or deforming during heat treatment and which have a uniform and high hardness; a bearing raceway ring; a thrust needle roller bearing; a method of producing rolling bearing raceway rings; a rolling bearing raceway ring; and a rolling bearing.

A radial bearing (1a, 1b, 1c, 1d), especially a roller bearing (9) comprising an outer part (3) opposite an inner part (6), which rotate relative to each other about a common longitudinal axis (5) is provided, wherein the radial bearing (1a, 1b, 1c, 1d) includes a bearing seat (8a, 8b, 8c, 8d), which is formed in the outer part (3) or on the inner part (6) and which is generally stationary relative to a radial load (10a, 10b, 10c, 10d) acting on the bearing seat (8a, 8b, 8c, 8d) in a load zone (12a, 12b, 12c, 12d). The bearing seat (8a, 8b, 8c, 8d) features a variable width over its extent in a direction of the longitudinal axis (5), such that, starting from the load zone (12a, 12b, 12c, 12d), the bearing seat (8a, 8b, 8c, 8d) is significantly narrowed outside of the load zone (12a, 12b, 12c, 12d).

A thrust needle bearing with an isolating layer has a cage with rollers, washers on which the rollers run, at least one of the washers is attached to the cage, backup surfaces fixed external to each of the washers and an isolating layer attached to at least one of the washers, which is interposed between the at least one of the washers and at least one of the backup surfaces of the bearing. The isolating layer is a layer of vibration-attenuating material. Alternatively, the isolating layer is a layer of material which has properties that prevent creep or sliding wear for at least one of the backup surfaces. The isolating layer is attached to the washers by bonding, use of adhesives or mechanical means.

A roller follower includes a roller ring, a shaft and a plurality of rollers. At least one of the roller ring, the shaft and the rollers is a steel member made of steel containing 0.7 to 2.4% carbon and 10.0 to 20.0% chromium, with remainder iron and impurities. In addition, carbide containing at least any one of iron and chromium as well as carbon and having an area of 12.6 μm2 or greater is generated at an area ratio of 5.0% or higher, at a rolling contact surface of the steel member (a roller ring rolling contact surface, a shaft rolling contact surface and a roller rolling contact surface).

In a self-aligning bearing positioning and supporting one end of a rotation shaft in an axial direction and allowing the rotation shaft to bend, the bearing is structured as a double row cylindrical roller bearing with aligning ring, a first row of cylindrical roller group is positioned by being held in an axial direction between a radially inward flange provided in an intermediate portion in an axial direction of an outer ring having an outer peripheral surface formed in a spherical surface shape, and a flange provided in one outer end of two inner rings, and a second row of cylindrical roller group is positioned by being held in the axial direction between the flange of the outer ring and a flange provided in another outer ends of the two inner rings.