Abstract: A wheel bearing apparatus has an outer member, an inner member, double row rolling elements, and seals. At least one seal has a slinger and an annular sealing plate. The sealing plate has a metal core, press fit into the outer member, and a sealing member, integrally vulcanized adhered to the metal core. The sealing member has first and second side lips, formed with an inclination extending radially outward, and a cylindrical inner end portion, surrounding the inner circumferential edge and a portion of the back surface of the metal core. Each tip of the first and second side lips is in sliding contact with the slinger, with a predetermined interference. The cylindrical inner end portion is arranged opposite to the slinger with a slight radial gap therebetween to form a labyrinth seal.

Abstract: A vehicle wheel bearing apparatus has an outer member, an inner member, and double row rolling elements freely rollably contained between the inner and outer raceway surfaces of the inner and outer members. A brake pilot portion extends from a base of a wheel hub mounting flange toward the outer side to guide an inner circumferential surface of a brake rotor. A wheel pilot portion extends from the brake pilot portion further toward the outer side to guide an inner circumferential surface of the wheel. The wheel pilot portion including a plurality of separated pilots separated along a circumferential direction. A chamfered portion is formed, by forging, on a forward end of each separated pilot in view of its lathe cutting direction. The chamfered portion has a predetermined inclined angle relative to an axial end surface of each separated pilot after lathe cutting.

Abstract: A joint outer ring of a constant-velocity joint has a stem portion protruding from of a cup portion and inserted to a through hole of a hub in a bearing device. The joint outer ring has an abutment face abutting against an end face of a bearing inner ring fitted to an outer periphery of the hub in an outer bottom face of the cup portion, and is composed of a forged product of a steel material. The joint outer ring has a base material portion composed of a standard structure and an outer surface layer partially formed as a non-standard structure portion. The non-standard structure may be a tempered martensite structure, or a mixed structure including the tempered martensite structure and at least one of an upper bainite structure and a lower bainite structure.

Abstract: A driving wheel bearing apparatus has an inner ring 5 secured to a wheel hub 1 by a caulked portion 13. An outer joint member 14 of a constant velocity universal joint 3 has a shoulder portion 19 and a cylindrical shaft portion. Face splines 19a and 13a are formed at the end faces of the shoulder portion 19 and the caulked portion 13. Face splines 19a and 13a are supported with pressure by a fastening bolt 21 that abuts the outer side end face of the wheel hub 1 and is threadedly connected to an internal thread 20a of the shaft portion 20. Compressive remaining stress is placed on the surfaces of the face splines 19a and 13a as a result of surface modification, by shot peening. The surface hardness is set at 300 Hv or more.

Abstract: A wheel hub of a wheel bearing apparatus has an outer member and an inner member. The inner member includes a wheel hub and an inner ring. The wheel hub has a wheel mounting flange, a shaft portion, an inner raceway surface, a cylindrical portion, a shoulder portion, and a through bore. The inner ring is press-fit onto the cylindrical portion abutting against the shoulder portion. Double row rolling elements are contained between the inner and outer raceway surfaces of the inner member and the outer member. Fiber flow near the inner circumference of the material forming the wheel hub from the shoulder to the open end surface of the wheel hub is in a condition substantially parallel to the axis of the wheel hub.

Abstract: A wheel support bearing assembly includes an outer member (1), which serves as a stationary member and has an inner periphery formed with a plurality of rows of raceway surfaces (3), an inner member (2), which serves as a rotatable member and has an outer periphery formed with respective raceway surfaces (4) opposed to the previously described raceway surfaces (3), and a plurality of rows of rolling elements (5) interposed between the respective opposed raceway surfaces (3, 4). The outer member (1) is thermally refined by means of a quenching and a high temperature tempering process so that a layer of at least 2 mm in depth from a surface of the outer member is rendered to have a micro-pearlite structure.

Abstract: Provided are a method of manufacturing an outer race which contributes to extension of a bearing life and allows rolling elements to stably roll, an outer race for a double-row angular bearing, and a wheel bearing device. Further, provided is a double-row angular bearing which is excellent in both strength and rigidity and which can be endowed with a longer life and higher quality. At least one of an inner race and the outer race is formed by a cold rolling process. Hardness prior to the cold rolling process of a blank is set to Rockwell Hardness 30 HRC or less. The outer race is formed by performing the cold rolling process on the blank including a circumferentially protruding portion which is provided on a radially inner surface of the blank and protrudes to a radially inner side of the blank.

Abstract: A bearing device for a wheel enabling the easy control of quality since there is no possibility of cracking even if caulking is applied thereto. The bearing device comprises an outer ring having double rows of raceway surfaces on the inner periphery thereof, an inner member having raceway surfaces opposed to the raceway surfaces, and balls interposed between the double rows of raceway surfaces opposed to each other. The inner member further comprises a HUB ring and an inner ring. Caulking is applied to the HUB ring to join it to the inner ring. The grain size number of the austenite grains of a caulked section is at least 6.

Abstract: Provided are: a double-row angular bearing capable of enhancing its rolling life and cost reduction; a bearing device for a wheel, which is capable of reducing a number of assembling process steps in an assembly factory of automobiles and the like, is excellent in productivity, and is capable of cost reduction; and a method of producing an outer race and an inner race of a bearing, which can achieve their weight reduction to a large extent. The double-row angular bearing includes: an inner race having inner rolling surfaces on a radially outer surface thereof; an outer race having outer rolling surfaces on a radially inner surface thereof; and rolling elements rotatably housed between the outer rolling surfaces of the outer race and the inner rolling surfaces of the inner race. The outer race or the inner race is formed of a plastically worked article formed by cold rolling.

Abstract: A hub ring and/or an outer ring constituting a bearing device for a wheel, which is formed of a steel which contains 0.45 to 0.70 mass % of C and at least one of V, Nb and Ti in a total amount of 0.3 mass % or less, wherein a micro structure of a part being not surface-hardening-treated contains a ferrite in 15 to 30 area % and contains a particulate ferrite.

Abstract: A vehicle wheel bearing apparatus has an outer member with a body mounting flange, an inner member and double row rolling elements freely rollably contained between the inner and outer raceway surfaces of the inner and outer members. The body mounting flange is formed with a plurality of screw apertures. An inner side flange surface of the body mounting flange is formed by machining to have a flat vertical surface relative to a longitudinal axis of a wheel hub. An outer side flange surface of the body mounting flange is formed by forging to have a tapered surface of a predetermined inclined angle. Thus, the thickness of the body mounting flange is gradually reduced radially outward.

Abstract: A vehicle wheel bearing apparatus has an outer member, an inner member, and double row rolling elements freely rollably contained between the inner and outer raceway surfaces of the inner and outer members. A brake pilot portion extends from a base of a wheel hub mounting flange toward the outer side to guide an inner circumferential surface of a brake rotor. A wheel pilot portion extends from the brake pilot portion further toward the outer side to guide an inner circumferential surface of the wheel. The wheel pilot portion including a plurality of separated pilots separated along a circumferential direction. A chamfered portion is formed, by forging, on a forward end of each separated pilot in view of its lathe cutting direction. The chamfered portion has a predetermined inclined angle relative to an axial end surface of each separated pilot after lathe cutting.

Abstract: A vehicle wheel bearing apparatus has an outer member with double row outer raceway surfaces on its inner circumferential surface. An inner member includes a wheel hub and at least one inner ring. An outer joint member forms a constant velocity universal joint. The outer joint member has a cup-shaped mouth portion. A shoulder portion forms the bottom of the mouth portion. A shaft portion axially extends from the shoulder portion. The shaft is axially separably and torque transmittably inserted into the wheel hub with the shoulder abutted against the caulked portion to transmit torque. The inner ring is axially secured relative to the wheel hub by a caulked portion. The caulked portion is formed by plastically deforming, radially outwardly, the end portion of the cylindrical portion. The caulked portion has a flat surface formed by a cutting process that is adapted to surface contact the shoulder. The radially outermost end of the flat surface is arranged so that it does not abut against the shoulder.

Abstract: A vehicle wheel bearing apparatus is formed as a unit and has a wheel hub with a wheel mounting flange at one end. A cylindrical portion extends from the wheel mounting flange, via a shoulder portion. A wheel bearing, formed by a double row rolling bearing, is press fit onto the cylindrical portion of the wheel hub. The wheel bearing has an outer member formed with double row outer raceway surfaces on its inner circumferential surface. A pair of inner rings, formed with inner raceway surfaces, is arranged opposite to the double row outer raceway surfaces. The rings are press fit onto the cylindrical portion of the wheel hub, via a predetermined interference. One ring abuts the shoulder portion. Double row rolling elements are freely rollably contained between the opposed inner and outer raceway surfaces, via cages. The inner rings are axially immovably secured by a caulked portion. The caulked portion is formed by plastically radially outwardly deforming the end portion of the cylindrical portion.

Abstract: A wheel bearing apparatus is formed as a unit of a wheel hub and a double row taper roller bearing. An outer member is formed with double row tapered outer raceway surfaces, each opened axially outward, on its inner circumference. An inner member, including the wheel hub, has a wheel mounting flange integrally formed at one end of the wheel hub. On its larger outer diameter side, the inner ring has a larger flange portion to guide the tapered rollers. The at least one inner ring is secured on the wheel hub by a caulked portion. A predetermined hardened layer is formed by high frequency induction hardening over a range from the base of the wheel mounting flange to the cylindrical portion. A position of the inner side end of the hardened layer is set within a range from an edge of a chamfered portion at the caulked side of the inner ring to a position corresponding to a root of the larger flange portion.

Abstract: A wheel hub of a wheel bearing apparatus has an outer member and an inner member. The inner member includes a wheel hub and an inner ring. The wheel hub has a wheel mounting flange, a shaft portion, an inner raceway surface, a cylindrical portion, a shoulder portion, and a through bore. The inner ring is press-fit onto the cylindrical portion abutting against the shoulder portion. Double row rolling elements are contained between the inner and outer raceway surfaces of the inner member and the outer member. Fiber flow near the inner circumference of the material forming the wheel hub from the shoulder to the open end surface of the wheel hub is in a condition substantially parallel to the axis of the wheel hub.

Abstract: A wheel support bearing assembly, which enables an increase in the strength and the fatigue strength of its wheel mounting flange or vehicle body fitting flange against high stress and repeated stress and the suppression of the increase of the number of processes, includes an inner member and an outer member rotatable relative to each other through rolling elements. The flange is formed on the inner member or the outer member, for example, a hub. A component part having the flange is a hot-forged product of steel in which a matrix portion is formed as a standard structure and the non-standard structural portion is formed on the surface of the flange. The non-standard structure is formed of either of a fine ferrite/pearlite structure, an upper bainite structure, a lower bainite structure, and a tempered martensite structure, or mixture of two or more of these structures.

Abstract: A joint outer ring (4) of a constant-velocity joint (1) has a stem portion (10) protruding from of a cup portion (9) and inserted to a through hole (31) of a hub (27) in a bearing device (2). The joint outer ring (4) has an abutment face (9aa) abutting against an end face of a bearing inner ring (28) fitted to an outer periphery of the hub (27) in an outer bottom face (9a) of the cup portion, and is composed of a forged product of a steel material. The joint outer ring (4) has a base material portion composed of a standard structure and an outer surface layer partially formed as a non-standard structure portion (30). The non-standard structure may be any one of an upper bainite structure, a lower bainite structure and a tempered martensite structure, or a mixed structure of at least two of the structures.

Abstract: A method is directed to a production of a bearing device for a wheel including an inner member (1) and an outer member (2) rotatable relative to each other through a plurality of rolling elements (3), in which a component part forming one of the inner member (1) and the outer member (2) is a hot forged product. In the practice of this method, during or at the end of a hot forging step for hot forging the component part, a portion of the component part is cooled by spraying a coolant or by controlling an atmospheric temperature, to thereby render a matrix of the component part to represent a standard structure and render a surface portion of the component part to represent a non-standard structure (30).

Abstract: A vehicle wheel bearing apparatus has an outer member with double row outer raceway surfaces on its inner circumferential surface. An inner member includes a wheel hub and at least one inner ring. The wheel hub has a wheel mounting flange formed at one end. A cylindrical portion axially extends from the wheel mounting flange. The inner ring has at least one inner raceway surface arranged opposite to the plurality of outer raceway surfaces. The inner ring is press fit onto the cylindrical portion of the wheel hub. Double row rolling elements are freely rollably contained between the outer and inner raceway surfaces. An outer joint member forms a constant velocity universal joint. The outer joint member has a cup-shaped mouth portion. A shoulder portion forms the bottom of the mouth portion. A shaft portion axially extends from the shoulder portion. The shaft is axially separably and torque transmittably inserted into the wheel hub with the shoulder abutted against the caulked portion to transmit torque.