Ntn Corporation

Kazunari Yamamoto

Hiroshi Kawamura

Kazuhisa Shigeoka

Akira Torii

Kiyotake Shibata

Hisashi Ohtsuki

Eiji Tajima

Kazuo Komori

Mitsuru Umekida

Shigeaki Fukushima

Taku Nishiki

Takao Maeda

Motoharu Niki

Masuo Takaki

Tomoko Baba

Kazuhiro Azuma

Nobukatsu Uchiyama

Naoshi Kinpara

Hayato Taniguchi

Masahiro Ozawa

Syougo Suzuki

Hiroyuki Ogura

Yujiro Ono

Yasuhiro Aritake

Kohei Yoshino

Keizo Kobayashi

Sadaji Katogi

Yasushi Shibata

Shunsuke Morita

Chinami Kitanaka

Hideo Shinagawa

Hisao Ishiguro

Hiedeo Shinagawa

A wheel bearing device () including: an outer member () on the inner periphery of which an outer-side rolling surface () is formed; an inner member () on the outer periphery of which an inner-side rolling surface () is formed; and a plurality of rolling bodies () interposed between the rolling surfaces () of the outer member () and the inner member (). The wheel bearing device having a spline hole () formed in a through hole () of the inner member (). The spline hole includes a guide groove (G) formed on an inner circumferential surface thereof. A guide plate (G) of a finishing broach () passes through the guide groove in the inner periphery of the spline hole ().

Wheel bearing device

Wheel bearing device and method for manufacturing said device

A bearing device () for a vehicle wheel provided with: an outer member (); and an inner member comprising a hub wheel (), and at least one inner wheel () press-fitted into the small-diameter ridge (A) of the hub wheel (); wherein a belt-shaped part (F) that radially protrudes by a protrusion amount (P) is formed over a prescribed width (W) in the outer peripheral surface of the outer member () so that at least part of the belt-shaped part (F) radially overlaps the outside rolling surface (D) which is on the vehicle-wheel-attachment-flange-facing side of the outer member (). The present invention addresses the problem of providing a bearing device for a vehicle wheel in which the amount of deformation in an opening of an outer member can be reduced and decreases in rolling fatigue service life can be prevented while keeping overall weight increase to a minimum.

Bearing device for vehicle wheel

A bearing device for wheels is configured so as to reduce an amount of deformation of an opening of an outer member while minimizing an increase in overall weight, thus preventing a deterioration in rolling fatigue life. The bearing device for wheels is provided with an outer member having double-row outer rolling surfaces, a hub ring having a wheel mounting flange and having a small-diameter stepped section, and an inner member constituted by at least one inner ring press-fitted over the small-diameter stepped section, the inner member having double-row inner rolling surfaces facing the double-row outer rolling surfaces. A band-shaped section having a predetermined band width and protruding radially by a protrusion amount is formed on at least a part of the wheel mounting flange-side outer peripheral portion of the opening of the outer member.

Bearing device for wheels

A wheel bearing apparatus has an outer member with a body mounting flange and double row outer raceway surfaces, an inner member with double row inner raceway surfaces opposing the double row outer raceway surfaces, and double row rolling elements contained between the inner raceway surfaces and the outer raceway surfaces, respectively, of the inner member and the outer member. A plurality of bolt insertion holes formed in the outer member body mounting flange. An abutment surface, to abut against the body-side member, is formed around each bolt insertion hole as a surface projecting from the inner-side surface of the body mounting flange with a step height. A relative difference between the step heights of the abutment surfaces is limited to a minimum.

Wheel bearing apparatus and its mounting structure

Wheel bearing

An outer member and an inner member constituting a wheel bearing device are assembled and the brake rotor is fixed to the hub ring of the inner member. In this state, the pad slide surfaces of the brake rotor are lathed with the reference provided by a wheel pilot end surface. Alternatively, the wheel pilot end surface of the hub ring by chucking the knuckle pilot of the outer member with the wheel bearing device put in its assembled state, and the pad slide surfaces of the brake rotor are lathed with the reference provided by the wheel pilot end surface.

Processing method for brake rotor-equipped wheel bearing devices

A wheel bearing apparatus has an outer member, an inner member and double row rolling elements freely rollably contained between double row inner raceway surfaces and outer raceway surfaces of the inner member and the outer member. A plurality of bolt insertion bores, that fastening bolts pass through to fasten to the knuckle, are formed on the body mounting flange at plurality of positions circumferentially along the body mounting flange. The outer member is previously formed by hot forging. A seating surface for the fastening bolts is formed on an outboard-side surface of the body mounting flange by cold forging.

Wheel bearing apparatus and its manufacturing method

Processing method for brake rotor-equiped wheel bearing devices

A vehicle wheel bearing apparatus has an outer member, an inner member and double row rolling elements. A wheel mounting flange is integrally formed on a driving side of the inner member for mounting a wheel via a brake rotor. Through apertures are formed on the wheel mounting flange. Hollow pins, having a chamfered portion, are press-fit into the through apertures. The brake rotor is formed with insert apertures to receive the pins, at positions respectively corresponding to the hub bolts and pins. The brake rotor can be temporarily mounted on the wheel mounting flange by inserting or press-fitting the chamfered end sides of the pins into the insert apertures.

Wheel bearing apparatus for a vehicle

A wheel bearing apparatus of a semi-floating type has a pilot portionon an outer member. The pilot portion includes a cylindrical portionand a tapered portion. The tapered portiongradually decreases in diameter from the cylindrical portionto an end surface of the inboard side. A fitting portionof an axle housingcorresponds to the shape of the pilot portion. An annular grooveis formed at the tapered portionof the pilot portion. A seal ringis mounted in the annular groove. An outer diameter dof the seal ring, after mounting, is set smaller than an inner diameter dof the cylindrical portionof the axle housingThe seal ring elastically contacts the axle housing. A slight gap of a fitting portion between the outer memberand the axle housingis blocked off.

Wheel bearing apparatus

A wheel speed detecting apparatus incorporating a wheel speed detecting apparatus has an inner ring axially secured on a wheel hub. A protecting cover, with a substantially dish-shaped configuration, is press-formed from a non-magnetic austenitic stainless steel sheet. The cover includes a cylindrical fitting portion adapted to be fit onto the outer member. A disc-shaped shielding portion extends radially inward from the fitting portion. A bottom portion extends from the shielding portion, via an inclined portion, to close the inner side end of the inner member. The protecting cover is positioned to abut against a stepped portion formed on the end face or the inner circumference of the outer member.

Wheel bearing apparatus incorporated with a wheel speed detecting apparatus

A vehicle wheel bearing apparatus with a back-to-back double row tapered roller bearing has an outer member integrally with a body mounting flange and double row outer raceway surfaces tapered open respectively axially inward and outward. An inner member include a wheel hub and an inner ring or an outer joint member of a constant velocity universal joint. The wheel hub has a wheel mounting flange and one inner raceway surface arranged oppositely to one of the double row outer raceway surfaces and a cylindrical portion. The inner ring or the outer joint member of a constant velocity universal joint are press fit onto the cylindrical portion and include the other inner raceway surface arranged opposite to the other raceway surface of the double row outer raceway surfaces. Double row tapered rollers are freely rollably held between the outer and inner raceway surfaces by cages. Seals are arranged in annular openings formed by the outer and inner members. The cages are formed of synthetic resin. Posts between pockets of the cages are arranged to be positioned radially inward of the pitch circle diameter of the tapered rollers. The width of an opening radially inward of each pocket is set so that each tapered roller is held within the pocket. The contacting tapered surfaces of the posts open radially outward so that the rollers do not fall out radially inward.

Bearing apparatus for a wheel of vehicle

A cylindrical pilot portion P to be fitted to an inner periphery of a wheel () is formed at an inner diameter part of a brake rotor (). A shape of the hub wheel, in particular, the shape thereof on an outboard side is thereby simplified, and thus the hub wheel can be fabricated at low cost by cold forging or the like. An outer joint member () of an outboard side constant velocity universal joint () and a hub wheel () are connected with each other by way of a nut member ().

Bearing device for wheel

A wheel bearing apparatus incorporating a wheel speed detecting apparatus has an outer member, an inner member, double row rolling elements, a sensor holder, and a pulser ring. The sensor holder cover has a cylindrical fitting portion press-fit onto the inner side end portion of the outer member. A flange portion extends radially inward from the fitting portion. The flange portion is in close contact with the end face of the outer member. A bottom portion extends further radially inward from the flange portion. The holding portion is integrally joined to the bottom portion. The flange portion is formed with a flat surface so that it forms an abutting width larger than 5 mm or more, against the end face of the outer member, or larger than 50% or more, relative to the flat width of the end face of the outer member.

Growing community of inventors

Iwata, Japan

Kazunari Yamamoto