US 8,770,850 B2Granted

Asymmetric wheel hub assembly

AssigneeAktiebolaget Skf

InventorLuca Ciulla

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Abstract

An asymmetric wheel hub assembly with two rows of rolling elements of different pitch diameters has a central axis of rotation and inner raceway and outer raceways for each row of elements, the associated inner and outer raceways being axially displaced in accordance with a respective angle of contact and along a respective load line such that the assembly is capable of accommodating combined loading. The raceways of each row of rolling elements have osculation ratios which are defined by the ratio between the radius of curvature of the raceways and the outside diameters of the rolling elements of the associated row of rolling elements. The angle of contact and the osculation ratios of a first one of the two rows of the rolling elements is different than the angle of contact and osculation ratios of a second one of the two rows of the rolling elements.

Claims16

Dependent claims

An asymmetric wheel hub assembly comprising:

first and second inner raceways disposed about a central axis of rotation, each one of the first and second inner raceways having a radius of curvature;
a first row of rolling elements disposed on the first inner raceway and having a first pitch diameter and a second row of rolling elements disposed on the second inner raceway and having a second pitch diameter, the first pitch diameter having a value different than a value of the second pitch diameter, each rolling element of the first row having a first outside diameter and each rolling element of the second row having a second outside diameter;
and
first and second outer raceways each having a radius of curvature, the first outer raceway being disposed generally about and axially spaced from the first inner raceway such that a first load line through the first row of rolling elements defines a first angle of contact with respect to the central axis, and the second outer raceway being disposed generally about and axially spaced from the second inner raceway such that a second load line through the second row of rolling elements defines a second angle of contact with respect to the central axis;
wherein the first row of rolling elements has an osculation ratio defined between the first outer raceway radius of curvature and the first rolling element outside diameter and another osculation ratio defined between the first inner raceway radius of curvature and the first outside diameter, the second row of rolling elements has an osculation ratio defined between the second outer raceway radius of curvature and the second rolling element outside diameter and another osculation ratio defined between the second inner raceway radius of curvature and the second outside diameter, the first angle of contact has a value different than a value of the second angle of contact, and each of the two osculation ratios of the first row of rolling elements has a value different than a value of the corresponding osculation ratio of the second row of rolling elements, and
wherein the value of the osculation ratio between the radius of curvature of the first outer raceway and the first rolling element outside diameter is greater than the value of the osculation ratio between the radius of curvature of the second outer raceway and the second rolling element outside diameter.

3 more elements

An asymmetric wheel hub assembly comprising:

first and second inner raceways disposed about a central axis of rotation, each one of the first and second inner raceways having a radius of curvature;
a first row of rolling elements disposed on the first inner raceway and having a first pitch diameter and a second row of rolling elements disposed on the second inner raceway and having a second pitch diameter, the first pitch diameter having a value different than a value of the second pitch diameter, each rolling element of the first row having a first outside diameter and each rolling element of the second row having a second outside diameter;
and
first and second outer raceways each having a radius of curvature, the first outer raceway being disposed generally about and axially spaced from the first inner raceway such that a first load line through the first row of rolling elements defines a first angle of contact with respect to the central axis, and the second outer raceway being disposed generally about and axially spaced from the second inner raceway such that a second load line through the second row of rolling elements defines a second angle of contact with respect to the central axis;
wherein the first row of rolling elements has an osculation ratio defined between the first outer raceway radius of curvature and the first rolling element outside diameter and another osculation ratio defined between the first inner raceway radius of curvature and the first outside diameter, the second row of rolling elements has an osculation ratio defined between the second outer raceway radius of curvature and the second rolling element outside diameter and another osculation ratio defined between the second inner raceway radius of curvature and the second outside diameter, the first angle of contact has a value different than a value of the second angle of contact, and each of the two osculation ratios of the first row of rolling elements has a value different than a value of the corresponding osculation ratio of the second row of rolling elements, and
wherein the value of the osculation ratio between the radius of curvature of the first inner raceway and the first rolling element outside diameter is greater than the value of the osculation ratio between the radius of curvature of the second inner raceway and the second rolling element outside diameter.

3 more elements

An asymmetric wheel hub assembly comprising:

a first inner raceway and a second inner raceway disposed about a central axis of rotation, the first inner raceway having a radius of curvature and the second inner raceway having a radius of curvature;
a first row of rolling elements disposed on the first inner raceway and having a first pitch diameter and a second row of rolling elements disposed on the second inner raceway and having a second pitch diameter, the first pitch diameter having a value different than a value of the second pitch diameter, each rolling element of the first row of rolling elements having a first outside diameter and each rolling element of the second row of rolling elements having a second outside diameter;
and
a first outer raceway having a radius of curvature and a second outer raceway having a radius of curvature, the first outer raceway being disposed around and axially spaced from the first inner raceway such that a first load line through the first row of rolling elements defines a first angle of contact with respect to the central axis, and the second outer raceway being disposed around and axially spaced from the second inner raceway such that a second load line through the second row of rolling elements defines a second angle of contact with respect to the central axis;
wherein the first row of rolling elements has a first osculation ratio defined between the first outer raceway radius of curvature and the first rolling element outside diameter and a second osculation ratio defined between the first inner raceway radius of curvature and the first outside diameter,
wherein the second row of rolling elements has a third osculation ratio defined between the second outer raceway radius of curvature and the second rolling element outside diameter and a fourth osculation ratio defined between the second inner raceway radius of curvature and the second outside diameter,
wherein the first angle of contact has a value different than a value of the second angle of contact,
wherein the first osculation ratio is greater than the third osculation ratio, and
wherein the second osculation ratio is different than the fourth osculation ratio.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/090,684Filed 20 Apr 2011
Priority: IT TO2010A00032920 Apr 2010
Published: US 2011/0254355 A120 Oct 2011
Granted: 8 Jul 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

B60B 27/0005
Hubs: with ball bearings
B60B 27/0026
Characterised by torque transmission means from drive axle: of the radial type, e.g. splined key
F16C 19/186
In O-arrangement: with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
B60B 2380/12
Type: ball bearings