US 11,852,198 B2
Hub unit bearing and method for manufacturing same
Takashi Sakaguchi, Fujisawa (JP); and Eisho Watanabe, Fujisawa (JP)
Assigned to NSK, LTD., Tokyo (JP)
Appl. No. 17/639,999
Filed by NSK LTD., Tokyo (JP)
PCT Filed Sep. 7, 2020, PCT No. PCT/JP2020/033827
§ 371(c)(1), (2) Date Mar. 3, 2022,
PCT Pub. No. WO2021/045232, PCT Pub. Date Mar. 11, 2021.
Claims priority of application No. 2019-162523 (JP), filed on Sep. 6, 2019.
Prior Publication US 2022/0325751 A1, Oct. 13, 2022
Int. Cl. F16C 19/18 (2006.01); F16C 19/38 (2006.01); F16C 43/04 (2006.01); B60B 27/00 (2006.01)
CPC F16C 43/04 (2013.01) [B60B 27/001 (2013.01); B60B 27/0005 (2013.01); B60B 27/0084 (2013.01); F16C 19/18 (2013.01); F16C 19/186 (2013.01); F16C 19/386 (2013.01); F16C 2229/00 (2013.01); F16C 2326/02 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for manufacturing a hub bearing unit;
the hub bearing unit comprising:
an outer ring supported by and fastened to a suspension device so as not to rotate, and having double-row outer-raceways around an inner-circumferential surface thereof;
a hub to which a wheel is fastened and that rotates together with the wheel, and having double-row inner-raceways around an outer-circumferential surface thereof;
a plurality of rolling bodies arranged between the double-row outer-raceways and the double-row inner-raceways, and to which a preload is applied;
the hub comprising: an inner ring having an inner-raceway on an axially inner side of the double-row inner-raceways around an outer-circumferential surface thereof; and a hub spindle having an inner-raceway on an axially outboard side of the double-row inner-raceways around an outer-circumferential surface at an axially intermediate section thereof; and
the inner ring and the hub spindle, in a state in which the inner ring is externally fitted with a tubular fitting portion positioned further on the axially inboard side than the inner-raceway of the hub spindle that is on the axially outboard side, being joined and fastened together by pushing an end surface on the axially inboard side of the inner ring by a swaged portion formed by plastically deforming a tubular portion of the hub spindle that protrudes further toward the axially inboard side than an end surface on the axially inboard side of the inner ring outward in a radial direction;
the method for manufacturing the hub unit bearing comprising:
a pre-fitting step of measuring an outer-diameter dimension of the inner ring before externally fitting the inner ring with the tubular fitting portion;
an arranging step of arranging the outer ring and the rolling bodies around the hub spindle;
an external fitting step of externally fitting the inner ring with the tubular fitting portion;
a swaging step of forming the swaged portion by plastically deforming the tubular portion outward in the radial direction; and
a post-swaging step of measuring an outer-diameter dimension of the inner ring after formation of the swaged portion;
then, finding an amount of decrease in an axial clearance that is decreased by the external fitting step and the swaging step based on an amount of expansion of the inner ring that is a difference between the outer-diameter dimension of the inner ring after formation of the swaged portion and the outer-diameter dimension of the inner ring before being externally fitted with the tubular fitting portion; and
controlling the preload based on the amount of decrease in the axial clearance.