# US 9,039,286 B2 · Bearing device for a wheel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,039,286 B2 - Document ID: US9039286B2 - Status: Granted - Kind: B2 - Application number: 14/269,508 - Filed: 2014-05-05 - Published: 2014-08-28 - Granted: 2015-05-26 - Earliest claimed: 2007-03-22 - Assignees: Ntn Corporation - Applicants: Akira Torii; Hiroshi Kawamura; Kiyoshige Yamauchi; Masahiro Ozawa; Tohru Nakagawa; Yuichi Asano; Mitsuru Umekida; Hisaaki Kura; Shin Tomogami - Inventors: Akira Torii; Hiroshi Kawamura; Kiyoshige Yamauchi; Masahiro Ozawa; Tohru Nakagawa; Yuichi Asano; Mitsuru Umekida; Hisaaki Kura; Shin Tomogami - Web page: https://patentgrep.com/patent/US9039286B2 ## CPC - B60B 27/0078: {characterised by the fixation of bearings} - F16D 1/104: having retaining means rotating with the coupling and acting only by friction - B60B 27/0005: {with ball bearings} - B60B 27/0042: {characterised by the fixation of the homokinetic joint to the hub} - B60B 27/0084: {caulking to fix inner race} - B60B 27/0094: {one or more of the bearing races are formed by the hub} - F16C 19/184: {in O-arrangement} - F16C 19/186: {with three raceways provided integrally on parts other than race rings, e.g. third generation hubs} - F16C 33/586: {outside the space between the races, e.g. end faces or bore of inner ring} - F16C 33/64: Special methods of manufacture - F16C 35/063: Fixing them on the shaft (with interposition of an element F16C35/07) - F16C 35/0635: {the bore of the inner ring being of special non-cylindrical shape which co-operates with a complementary shape on the shaft, e.g. teeth, polygonal sections} - F16D 1/072: involving plastic deformation (plastic welding F16D1/068) - F16D 1/0858: {due to the elasticity of the hub (including shrink fits)} - F16D 3/2237: where the grooves are composed of radii and adjoining straight lines, i.e. undercut free [UF] type joints - B60B 2310/316: by press-fitting, shrink-fitting - B60B 2380/12: Ball bearings - F16C 35/077: between housing and outer race ring - F16C 2326/02: Wheel hubs or castors - F16D 2001/103: {the torque is transmitted via splined connections} - F16D 2003/22326: {Attachments to the outer joint member, i.e. attachments to the exterior of the outer joint member or to the shaft of the outer joint member} - Y10T 29/49536: Hub shaping - Y10T 403/7021: Axially extending - Y10T 403/7026: Longitudinally splined or fluted rod - B60B: VEHICLE WHEELS (making wheels or wheel parts by rolling B21H1/00, by forging, hammering or pressing B21K1/28); CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A bearing device for a wheel prevents backlash in a circumferential direction and has excellent workability for connecting a hub wheel and an outer joint member of a constant velocity universal joint. The bearing device includes a recess-projection fitting structure in which the hub wheel and a shaft section, which is fitted in a hole of the hub wheel of the outer joint member of the constant velocity universal joint, are unitized together. In the recess-projection fitting structure, entire fitting regions among projections on the outer surface of the shaft section of the outer joint member and recesses, which fit on the projections, are brought into intimate contact with each other. ## Claims ### Claim 1 A bearing device for a wheel, the bearing device comprising: a bearing; and an outer joint member having a shaft section, the shaft section having an outer diameter surface with a projection extending axially therefrom, wherein the bearing comprises an outer member having double-row outer raceway surfaces, an inner member having double-row inner raceway surfaces, and rolling elements in double rows interposed between the double-row outer raceway surfaces of the outer member and the double-row inner raceway surfaces of the inner member, the inner member has a hub wheel having a hole and a flange for attachment to a wheel, the hole having an inner diameter surface with a small recess provided thereat, an end of the hub wheel has a caulked portion formed thereat, the caulked portion applying a preload to the bearing, the shaft section of the outer joint member is inserted in a fitting manner into the hole of the hub wheel and is coupled to the hub wheel, and the projection is press-fitted along an axial direction into the small recess, and a recess is formed in the hole of the hub wheel by cutting the small recess by the press-fitting of the projection, to thereby form a recess-projection fitting structure in which the projection and the recess are held in close contact with each other over an entire region of fitting contact regions therebetween. ### Claim 2 (depends on 1) A bearing device for a wheel according to claim 1, wherein an outer surface side of the hub wheel has an induction-hardened layer formed thereon, and an inner surface side of the hub wheel is in an unhardened state. ### Claim 3 (depends on 1) A bearing device for a wheel according to claim 1, wherein the projection is a plurality of projections provided on the outer diameter surface of the shaft section of the outer joint member forming a spline, the spline having a module equal to or smaller than 0.5. ### Claim 4 (depends on 1) A bearing device for a wheel according to claim 1, wherein the projection is a plurality of projections provided on the outer diameter surface of the shaft section of the outer joint member forming a spline, and circumferential thicknesses of projecting direction intermediate regions of the projections are smaller than circumferential dimensions in positions corresponding to intermediate regions in between adjacent pairs of the projections in a circumferential direction. ### Claim 5 (depends on 1) A bearing device for a wheel according to claim 1, wherein the projection has a press-fitting start end surface extending in a direction perpendicular to the axial direction. ### Claim 6 (depends on 1) A bearing device for a wheel according to claim 1, wherein the hub wheel has an extruded portion generated from the recess formation by the press-fitting of the projection into the small recess. ### Claim 7 (depends on 6) A bearing device for a wheel according to claim 6, wherein the extruded portion has a smaller volume than an extruded portion generated when the projection is press-fitted into a hole of a hub wheel free of the small recess. ### Claim 8 (depends on 6) A bearing device for a wheel according to claim 6, wherein the shaft section of the outer joint member further has a pocket section in which the extruded portion is located.