Abstract: A bearing apparatus for a wheel of a vehicle for rotatably supporting a wheel of a vehicle relative to a suspension system. The bearing apparatus improves the durability of an inner ring fit onto a wheel hub. The bearing apparatus for a wheel of a vehicle has an inner member which includes a wheel hub with an integrally formed wheel mounting flange at one end and a cylindrical portion axially extending from the wheel mounting flange. An inner ring is fit onto the cylindrical portion. An outer member is arranged around the inner member. Double row rolling elements are freely rollably contained between the inner and outer members. The inner ring is secured in an axial direction relative to the wheel hub by a caulked portion. The caulked portion is formed by radially outwardly deforming the end of the cylindrical portion of the wheel hub. A chamfer is formed on an outer circumferential surface of a back side of the inner ring.

Abstract: A vehicle wheel bearing apparatus has an outer member formed, on its inner circumference, with double row outer raceway surfaces. An inner member includes a wheel hub integrally formed with a wheel mounting flange at its one end. The wheel hub outer circumference surface has double row inner raceway surfaces arranged opposite to the double row outer raceway surfaces. Double row balls are freely rollably contained between the outer raceway surfaces and inner raceway surfaces, respectively, of the outer member and the inner member. A pitch circle diameter of the double row ball group of the outer-side is larger than a pitch circle diameter of the double row ball group of the inner-side. At least the outer member and the wheel hub are formed of medium/high carbon steel including carbon of 0.40˜0.80% by weight. The inner and outer raceway surfaces are formed, respectively, with predetermined hardened layers with a surface hardness of 58˜64 HRC.

Abstract: A vehicle wheel bearing apparatus has a double row angular ball bearing including double rows of ball groups. A pitch circle diameter of the double row ball group of the outer side is larger than a pitch circle diameter of the double row ball group of the inner side. The outer member is made of medium carbon steel including carbon of 0.40˜0.80% by weight. It is hardened by high frequency induction quenching so that each of the outer raceway surfaces is formed with a hardened layer having a surface hardness of 58˜64 HRC. The effective depth of hardened layer is set at at least 2 mm. The minimum wall thickness of the outer member at these outer raceway surfaces is set at at least 4 mm.

Abstract: A vehicle wheel bearing apparatus has an outer member formed, on its inner circumference, with double row outer raceway surfaces. An inner member includes a wheel hub integrally formed with a wheel mounting flange at its one end. The wheel hub outer circumference surface has double row inner raceway surfaces arranged opposite to the double row outer raceway surfaces. Double row balls are freely rollably contained between the outer raceway surfaces and inner raceway surfaces, respectively, of the outer member and the inner member. A pitch circle diameter of the double row ball group of the outer-side is larger than a pitch circle diameter of the double row ball group of the inner-side. At least the outer member and the wheel hub are formed of medium/high carbon steel including carbon of 0.40˜0.80% by weight. The inner and outer raceway surfaces are formed, respectively, with predetermined hardened layers with a surface hardness of 58˜64 HRC.

Abstract: A wheel bearing apparatus has a wheel hub (4) formed on its one end with a wheel mounting flange (6). Its outer circumference includes one inner raceway surface (4a). A seal (11) has an integrally formed side lip (18a) extending radially outwardly toward its tip and in sliding contact with an inner side base portion (6c) of the wheel mounting flange (6), via a predetermined interference. An initial maximum diameter of the side lip (18a) is formed with a smaller diameter than that of a maximum diameter of the seal (11). A difference (e) between the initial maximum diameter of the side lip (18a) and the maximum diameter of the seal (11) is set at least 1 mm on one side (i.e. radius). The seal (11) is stably press-fit into the outer member (2) without interfering with the side lip 18a. The seal keeps a predetermined resisting force against the push out force, to improve the sealability and durability of the seal and thus extends the life of the bearing apparatus.

Abstract: A vehicle wheel bearing apparatus has a double row angular ball bearing including double rows of ball groups. A pitch circle diameter of the double row ball group of the outer side is larger than a pitch circle diameter of the double row ball group of the inner side. The outer member is made of medium carbon steel including carbon of 0.40˜0.80% by weight. It is hardened by high frequency induction quenching so that each of the outer raceway surfaces is formed with a hardened layer having a surface hardness of 58˜64 HRC. The effective depth of hardened layer is set at at least 2 mm. The minimum wall thickness of the outer member at these outer raceway surfaces is set at at least 4 mm.

Abstract: A bearing apparatus for a wheel of a vehicle for rotatably supporting a wheel of a vehicle relative to a suspension system. The bearing apparatus improves the durability of an inner ring fit onto a wheel hub. The bearing apparatus for a wheel of a vehicle has an inner member which includes a wheel hub with an integrally formed wheel mounting flange at one end a cylindrical portion axially extending from the wheel mounting flange. An inner ring is fit onto the cylindrical portion. An outer member is arranged around the inner member. Double row rolling elements are freely rollably contained between the inner and outer members. The inner ring is secured in an axial direction relative to the wheel hub by a caulked portion. The caulked portion is formed by radially outwardly deforming the end of the portion of the wheel hub. A chamfer is formed on an outer circumferential surface of a back side of the inner ring. The chamfer is formed as a cut surface machined after heat treatment of the inner ring.

Abstract: A cam follower with roller of the present invention includes a cam follower body having a roller supporting portion integrated therein, a roller supporting shaft having both ends fixed to the roller supporting portion and a roller rotatably supported on the roller supporting shaft with a plurality of needle rollers interposed. At least one of the supporting shaft and the needle roller has a nitride layer on the surface thereof, and has a surface hardness of at least HV 650 and an amount of retained austenite of at least 25% by volume and at most 50% by volume. Thus, a cam follower with roller having excellent durability and fatigue life can be obtained.

Abstract: A cam follower with roller of the present invention includes a cam follower body having a roller supporting portion integrated therein, a roller supporting shaft having both ends fixed to the roller supporting portion and a roller rotatably supported on the roller supporting shaft with a plurality of needle rollers interposed. At least one of the supporting shaft and the needle roller has a nitride layer on the surface thereof, and has a surface hardness of at least HV 650 and an amount of retained austenite of at least 25% by volume and at most 50% by volume. Thus, a cam follower with roller having excellent durability and fatigue life can be obtained.