WO2005065077A2 - Asymmetric hub assembly - Google Patents
Asymmetric hub assembly Download PDFInfo
- Publication number
- WO2005065077A2 WO2005065077A2 PCT/US2004/033976 US2004033976W WO2005065077A2 WO 2005065077 A2 WO2005065077 A2 WO 2005065077A2 US 2004033976 W US2004033976 W US 2004033976W WO 2005065077 A2 WO2005065077 A2 WO 2005065077A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hub
- row
- rolling elements
- diameter
- outboard
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
- F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
- F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
- F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
- F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B27/00—Hubs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B27/00—Hubs
- B60B27/02—Hubs adapted to be rotatably arranged on axle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/49—Bearings with both balls and rollers
- F16C19/492—Bearings with both balls and rollers with two or more rows with angular contact
- F16C19/495—Bearings with both balls and rollers with two or more rows with angular contact with two rows
- F16C19/497—Bearings with both balls and rollers with two or more rows with angular contact with two rows in O-arrangement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/70—Diameters; Radii
- F16C2240/80—Pitch circle diameters [PCD]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2326/00—Articles relating to transporting
- F16C2326/01—Parts of vehicles in general
- F16C2326/02—Wheel hubs or castors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
- F16C41/02—Arrangements for equalising the load on a plurality of bearings or their elements
Definitions
- the present invention relates to improvements in hub units for vehicles and more specifically to a novel asymmetric bearing arrangement for rotatably supporting a wheel of a vehicle.
- Hub units for vehicle wheels are not new per se. Typical of the prior are units are shown in patents such as the OSHIAKI, United States Patent No.: 6,036,371 for ROLLING BEARING UNIT FOR VEHICLE WHEEL issued March 14, 2000 and the Evans, United States Patent No.: 4,333,695 for ROLLING BEARING issued January 8, 1982.
- the hub units typically comprise a generally cylindrical hub having a radially outwardly directed flange for mounting to a wheel of a vehicle via a series of circumferentially spaced bolt holes accommodating lugs or studs for supporting the wheel.
- a pair of axially spaced rows of bearings support the wheel for rotation between an outer ring having internal raceways for the rolling elements.
- the bearing support comprises a row of balls and a row of tapered rollers.
- the present invention is an improvement in hub assemblies of this general type and is characterized by novel features of construction and arrangement providing functional advantages over the prior art such as a more balanced load distribution on the bearings and what is termed a "stiffer" hub reducing bending moments particularly beneficial in cornering maneuvers.
- the present invention provides an asymmetric unit wherein the diameter of the pitch circle of the bearing in the outboard row adjacent the radial flange of the hub is of a greater diameter than the diameter of the pitch circle of the bearing at the inboard end.
- the inner and outer rows of the bearings are angular contact ball bearings and the diameter of the row at the outboard or wheel end is preferably at least five mm greater than the diameter of the pitch circle of the row at the inner suspension end.
- the outboard row preferably intercepts the hub axis outboard of the hub flange which balances the loads on the system more evenly between the inner and outer bearing rows. Additionally, by reason of the asymmetric design, the outboard row can accommodate more balls and thereby increase the capacity of the bearing without changing the package geometry. With this design, the outboard pressure center can be placed further outboard than a symmetrical unit without having to increase the contact angle and reducing bearing radial dynamic capacity In other words, comparing the symmetrical ball units of the prior art with the asymmetrical unit of the present invention, the asymmetric arrangement provides more capacity without impacting the knuckle or axial flange geometry.
- the hub unit can accommodate large diameter wheels which apply a heavier bending moment on the hubs.
- the asymmetric designs allows wheel size increases without any changes in the hub design.
- the present invention improves hub flange strength and increases robustness and enhances safety of hubs.
- Figure 1. is a transverse sectional view of an asymmetric hub assembly in accordance with the present invention
- Figure 2. is a transverse sectional view of another embodiment of asymmetric hub assembly in accordance with the present invention
- Figure 3. is a transverse sectional view of an asymmetric hub in accordance with the present invention showing balancing the loads and a reduction in the radial load component on the outer row as compared to the prior art symmetric arrangement
- Figure 4. is a free body diagram comparing load distribution for symmetric prior art system and the asymmetric hub assembly of the present invention
- Figure 5. is a free body diagram comparing bending moment of asymmetric hub design of the present invention verses prior art asymmetric systems.
- the hub assembly (10) includes an elongated hub (12) having a splined center opening running axially of the hub (12) and having at its outboard or wheel end a circumferentially extending radially outwardly directed flange (16) having a series of circumferentially spaced holes (18) to mount a wheel of a vehicle by means of studs (20).
- the hub assembly (10) has an outboard and an inboard row of the ball bearings, Ro, Ri which ride on outer raceways (22), (24) of an outer ring (26).
- the inner raceway (28) for the outboard row Ro is formed integrally with the hub (12) and the inner raceway (30) for the inboard row of ball bearings Ri is formed on a annular insert (32) held in place after assembly of the balls in the two rows Ro, Ri by a circumferentially extending lip (34) at the inner axial end of the hub (12).
- Conventional seals S are provided at the opposing axial ends of the annular space between the hub (12) and the outer ring (26).
- the outer ring (26) has means (27) at its inboard or suspension end for securing it to a frame or steering mechanism of a vehicle.
- a sensor (38) is also mounted in the outer ring (26) which confronts a sensing ring (4O) on the hub to measure speed of rotation in the conventional way.
- the present invention is characterized by novel features of construction and arrangement providing an asymmetric bearing which has functional advantages over the prior art.
- the diameter D of the pitch circle of the outboard row of balls Ro is preferably greater than the diameter Di of the pitch circle of the inboard row of balls Ri.
- the difference in the diameters Do, Di is preferably at least five (5) mm.
- the contact angle of the bearings intersect the rotational axis A-A of the hub at points defined herein as pressure centers Po, Pi.
- the pressure centers Po, Pi lie outside the flange (16) at the outboard end of the hub assembly and at the inboard end as we II to provide enhanced performance such as higher load carrying capability and better distribution of the load on the bearings Ro, Ri.
- Fig 3 illustrates how road forces act on the pressure centers Po, Pi of an angular contact ball hub unit in accordance with the present invention to provide improved load distribution on the bearings Ro, Ri and also to reduce the bending moment arm on the outboard flange (16) of the assembly.
- the load force Fr from the road tire interface is acting outboard of the geometric center B-B of the bearing.
- the distance from the point of application of the force Fr at the bearing axis A-A to the outboard pressure center Po is a shorter distance than the distance to the inboard pressure center Pi and therefore the magnitude of the vertical force Fv2 acting on the outboard row of the outboard bearing Ro will be larger than that of the inboard force Fv1 based on a simple beam theory.
- the distance to the force Fv3 is increased thereby producing a reduction of the magnitude of this force.
- Fig. 5 is a free body diagram showing effect of the lateral road force Fa under cornering conditions on the bending moment acting on the hub assembly. As can be seen in Fig.
- the moment arm L, of a symmetric arrangement is greater than the moment arm L 2 of the asymmetric arrangement and by reason of this difference, the moments about A which is a product of Fa x L., is greater than the moment about B which is Fa x L 2 . Therefore, by reason of the moment arm differential, the effective moment on the symmetric is higher and thus the hub flange will yield more and adversely effect the "stiffness" of the hub assembly.
- FIG. 2 A modified embodiment of asymmetric hub assembly in accordance with the present invention is shown in Figure 2.
- the hub assembly generally designated by the numeral 10a is the same in terms of components except in this instance, the inboard bearing Ri is a tapered roller bearing and is used in applications where the predominant load is radial this arrangement can be used where an existing taper roller bearing needs to be replaced without having to change the knuckle diameter.
- the invention provides improved performance in predominantly radial load conditions such as in heavy truck applications which typically utilize tapered rollers.
- the bearings incorporate the same offset relationship of the inner and outer rows Ri, Ro as described above and the intersection of the contact angle ⁇ is preferably outward of the axial end of the hub.
- the preferred asymmetric design utilizing balls in the outboard row Ro provides hub stiffness and structural strength improvement without sacrificing load carrying capacity.
- the magnitude of the vertical force acting on the outboard row designated F v2 is larger than the force F v1 on the inboard side which lowers life expectancy of the outboard row Ro.
- the beneficial effects are manyfold even without a change of the contact angle ⁇ .
- the magnitude of the force is reduced ( ⁇ ), more room is created to accommodate more balls further improving life expectancy and producing further force reduction F y4 .
- benefits of the asymmetric design include high camber stiffness providing improved brake wear, better driving precision, optimized bearing capacity and life expectancy.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2551893A CA2551893C (en) | 2003-10-14 | 2004-10-13 | Asymmetric hub assembly |
MXPA06004192A MXPA06004192A (en) | 2003-10-14 | 2004-10-13 | Asymmetric hub assembly. |
EP19181123.1A EP3611392A1 (en) | 2003-10-14 | 2004-10-13 | Asymmetric wheel hub rolling bearing assembly |
AU2004311585A AU2004311585B2 (en) | 2003-10-14 | 2004-10-13 | Asymmetric hub assembly |
BRPI0415473A BRPI0415473B1 (en) | 2003-10-14 | 2004-10-13 | hub bearing assembly |
EP04821034.8A EP1689597B1 (en) | 2003-10-14 | 2004-10-13 | Asymmetric hub assembly |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US51100403P | 2003-10-14 | 2003-10-14 | |
US60/511,004 | 2003-10-14 | ||
US10/964,013 US7104695B2 (en) | 2003-10-14 | 2004-10-13 | Asymmetric hub assembly |
US10/964,013 | 2004-10-13 |
Publications (3)
Publication Number | Publication Date |
---|---|
WO2005065077A2 true WO2005065077A2 (en) | 2005-07-21 |
WO2005065077A8 WO2005065077A8 (en) | 2006-06-15 |
WO2005065077A3 WO2005065077A3 (en) | 2009-08-27 |
Family
ID=34594742
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2004/033976 WO2005065077A2 (en) | 2003-10-14 | 2004-10-13 | Asymmetric hub assembly |
Country Status (9)
Country | Link |
---|---|
US (2) | US7104695B2 (en) |
EP (2) | EP1689597B1 (en) |
KR (1) | KR101079397B1 (en) |
CN (1) | CN103448467B (en) |
AU (1) | AU2004311585B2 (en) |
BR (1) | BRPI0415473B1 (en) |
CA (1) | CA2551893C (en) |
MX (1) | MXPA06004192A (en) |
WO (1) | WO2005065077A2 (en) |
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WO1998021055A1 (en) * | 1996-11-14 | 1998-05-22 | Kelsey Hayes Company | Vehicle wheel hub mounting system |
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JPH1191308A (en) * | 1997-09-22 | 1999-04-06 | Nippon Seiko Kk | Rolling bearing unit for wheel |
US5997182A (en) * | 1997-11-03 | 1999-12-07 | Skf Industrie S.P.A. | Vehicle wheel hub bearing unit with a removable sensor |
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JP2000211310A (en) * | 1999-01-21 | 2000-08-02 | Ntn Corp | Wheel support structure |
US6857786B2 (en) * | 2000-02-01 | 2005-02-22 | Frank Victor Csik | Constant velocity joint integrated to wheel bearing and to axially adjustable hub |
US7287911B2 (en) * | 2001-11-08 | 2007-10-30 | Jtekt Corporation | Bearing device for supporting pinion shaft |
JP2003232343A (en) * | 2002-02-06 | 2003-08-22 | Nsk Ltd | Wheel bearing equipment |
JP4206716B2 (en) * | 2002-09-17 | 2009-01-14 | 株式会社ジェイテクト | Rolling bearing device |
FR2857893B1 (en) * | 2003-07-24 | 2006-09-22 | Roulements Soc Nouvelle | METHOD FOR MAKING A PROGRESSIVE TRANSITION RETENTION FLANGE |
EP1689597B1 (en) * | 2003-10-14 | 2019-07-31 | Ab Skf | Asymmetric hub assembly |
-
2004
- 2004-10-13 EP EP04821034.8A patent/EP1689597B1/en active Active
- 2004-10-13 MX MXPA06004192A patent/MXPA06004192A/en active IP Right Grant
- 2004-10-13 BR BRPI0415473A patent/BRPI0415473B1/en active IP Right Grant
- 2004-10-13 KR KR1020057010877A patent/KR101079397B1/en active IP Right Grant
- 2004-10-13 AU AU2004311585A patent/AU2004311585B2/en not_active Ceased
- 2004-10-13 US US10/964,013 patent/US7104695B2/en active Active
- 2004-10-13 CN CN201310233656.3A patent/CN103448467B/en active Active
- 2004-10-13 CA CA2551893A patent/CA2551893C/en not_active Expired - Fee Related
- 2004-10-13 WO PCT/US2004/033976 patent/WO2005065077A2/en active Application Filing
- 2004-10-13 EP EP19181123.1A patent/EP3611392A1/en active Pending
-
2006
- 2006-09-08 US US11/517,600 patent/US20070086687A1/en not_active Abandoned
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US3971604A (en) | 1973-12-10 | 1976-07-27 | Skf Industrial Trading And Development Company, B.V. | Box bearing |
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US7901143B2 (en) | 2005-05-12 | 2011-03-08 | Ntn Corporation | Wheel support bearing assembly |
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US8308371B2 (en) | 2005-11-07 | 2012-11-13 | Ntn Corporation | Bearing apparatus for a wheel of vehicle |
US7997803B2 (en) | 2006-01-31 | 2011-08-16 | Schaeffler Kg | Multi-row anti-friction bearing |
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US8376625B2 (en) | 2006-08-31 | 2013-02-19 | Nsk Ltd. | Rolling bearing unit for wheel support |
JP2008162568A (en) * | 2006-12-06 | 2008-07-17 | Nsk Ltd | Wheel supporting double row rolling bearing unit, and manufacturing method thereof |
DE112008002291B4 (en) | 2007-10-02 | 2021-07-22 | Nsk Ltd. | Method for manufacturing a bearing ring member for a rolling bearing unit |
JP2010159011A (en) * | 2009-01-09 | 2010-07-22 | Nsk Ltd | Hub unit for supporting drive wheel |
Also Published As
Publication number | Publication date |
---|---|
KR20060118316A (en) | 2006-11-23 |
US7104695C2 (en) | 2011-08-30 |
CN103448467B (en) | 2015-08-05 |
BRPI0415473B1 (en) | 2015-12-01 |
CN103448467A (en) | 2013-12-18 |
EP1689597A2 (en) | 2006-08-16 |
EP1689597A4 (en) | 2010-08-11 |
BRPI0415473A (en) | 2006-12-19 |
CA2551893C (en) | 2010-12-14 |
US7104695C1 (en) | 2008-11-11 |
US20050111771A1 (en) | 2005-05-26 |
US20070086687A1 (en) | 2007-04-19 |
AU2004311585B2 (en) | 2008-11-06 |
AU2004311585A1 (en) | 2005-07-21 |
CA2551893A1 (en) | 2005-07-21 |
MXPA06004192A (en) | 2007-04-23 |
US7104695B2 (en) | 2006-09-12 |
WO2005065077A3 (en) | 2009-08-27 |
EP3611392A1 (en) | 2020-02-19 |
KR101079397B1 (en) | 2011-11-02 |
WO2005065077A8 (en) | 2006-06-15 |
EP1689597B1 (en) | 2019-07-31 |
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