Hub unit

Patent metadata

Field	Value
Publication number	US-10780735-B2
Application number	US-201716323052-A
Country	US
Kind code	B2
Filing date	Sep 12, 2017
Priority date	Sep 13, 2016
Publication date	Sep 22, 2020
Grant date	Sep 22, 2020

Abstract

A hub unit that is to be installed on a vehicle is provided with: an outer ring having, on the inner circumferential surface, a first outer raceway surface and a second outer raceway surface that is disposed to the outside of the first outer raceway surface in the vehicle width direction when the hub unit is installed on the vehicle; an inner shaft that is disposed on the inside of the outer ring concentrically with the outer ring and on which a wheel is installed on the outer end in the vehicle width direction; and an inner ring that is press-fitted to the inner shaft on the inner end in the vehicle width direction.

First claim

The invention claimed is:

1. A hub unit which is attached to a vehicle, comprising:
an outer ring which includes:
a first outer raceway surface and a second outer raceway surface formed in an inner peripheral surface of the outer ring, the second outer raceway surface being disposed further on an outer side than the first outer raceway surface in a vehicle width direction in a state where the hub unit is attached to the vehicle, and
a flange;

an inner shaft which is disposed coaxially with the outer ring on an inner periphery of the outer ring and to which a wheel is attached at an outer side in the vehicle width direction; and
an inner ring which is press-fitted to an inner side of the inner shaft in the vehicle width direction,
wherein:
the inner ring includes a first inner raceway surface corresponding to the first outer raceway surface on an outer peripheral surface,
the inner shaft includes a second inner raceway surface corresponding to the second outer raceway surface on the outer peripheral surface,
the hub unit further includes
a plurality of first rolling elements which are disposed in a bearing space formed between the outer ring and the inner shaft on which the inner ring is mounted and are in contact with the first outer raceway surface and the first inner raceway surface at a first contact angle smaller than 37°, and
a plurality of second rolling elements which are disposed in the bearing space and are in contact with the second outer raceway surface and the second inner raceway surface at a second contact angle larger than 37°,

the first contact angle is an angle formed between:
(i) a first plane that passes through a center of each of the plurality of first rolling elements and extends perpendicular to an axial direction of the hub unit, and
(ii) a first inclined line that passes through: (a) a contact point between the first outer raceway surface and a respective first rolling element, and (b) the center of the respective first rolling element,

the second contact angle is an angle formed between:
(i) a second plane that passes through a center of each of the plurality of second rolling elements and extends perpendicular to the axial direction of the hub unit, and
(ii) a second inclined line that passes through: (a) a contact point between the second outer raceway surface and a respective second rolling element, and (b) the center of the respective second rolling element,

the flange is disposed entirely axially outside an inner region of the outer ring that is defined by the first inclined line and the second inclined line,
a single body of the outer ring includes the first outer raceway surface, the second outer raceway surface, and the flange, and
an axial clearance determined by an extent of pressing of the inner ring against the inner shaft is set to be in a range of −0.1 mm or more and −0.015 mm or less.

2. The hub unit according to claim 1 , wherein
an axial clearance determined by an extent of pressing of the inner ring against the inner shaft is set to be in a range of −0.065 mm or more and −0.015 mm or less.

3. The hub unit according to claim 1 , wherein:
an inner-side end portion of an inner shaft main body of the inner shaft is caulked radially outward and is in contact with an inner-side end surface of the inner ring, and
a step portion of the inner shaft main body of the inner shaft is in contact with an outer-side end surface of the inner ring.

4. The hub unit according to claim 1 , wherein the first inclined line is inclined in a direction toward the plurality of second rolling elements with respect to the first plane.

5. The hub unit according to claim 1 , wherein an axial inner-side end portion of the inner shaft in the vehicle width direction is caulked radially outward and is in contact with an axial inner-side end surface of the inner ring, and an axial inner-side end portion of the bearing space is sealed by a cap extending between the outer ring and the inner ring so as to cover the axial inner-side end portion of the inner shaft.

Assignees

• Jtekt Corp

Inventors

• Inoue Yuya
• Onizuka Takaaki
• Hakata Toshihiro
• Wakisaka Teruyuki
• Toda Takuya

Classifications

• F16C19/186 Primary

  with three raceways provided integrally on parts other than race rings, e.g. third generation hubs · CPC title

• F16C2240/34

  Contact angles · CPC title

• F16C2240/46

  Gap sizes or clearances · CPC title

• F16C33/723

  Shaft end sealing means, e.g. cup-shaped caps or covers · CPC title

• B60B27/0073

  characterised by sealing means · CPC title