CA2202931A1 - Double flanged roller system - Google Patents
Double flanged roller systemInfo
- Publication number
- CA2202931A1 CA2202931A1 CA 2202931 CA2202931A CA2202931A1 CA 2202931 A1 CA2202931 A1 CA 2202931A1 CA 2202931 CA2202931 CA 2202931 CA 2202931 A CA2202931 A CA 2202931A CA 2202931 A1 CA2202931 A1 CA 2202931A1
- Authority
- CA
- Canada
- Prior art keywords
- spoke
- spokes
- hub
- elbow
- roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B1/00—Spoked wheels; Spokes thereof
- B60B1/02—Wheels with wire or other tension spokes
- B60B1/04—Attaching spokes to rim or hub
- B60B1/042—Attaching spokes to hub
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B1/00—Spoked wheels; Spokes thereof
- B60B1/02—Wheels with wire or other tension spokes
- B60B1/04—Attaching spokes to rim or hub
- B60B1/041—Attaching spokes to rim or hub of bicycle wheels
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolls And Other Rotary Bodies (AREA)
Abstract
Known hubs for spoked wheels typically include a cylindrical hub shell with a flange disposed at each end, each of which has a plurality of spaced apart holes through which elbow spokes are drawn and secured by means of their enlarged heads. In this invention, individual elbowless spokes thread into, or pass through, a corresponding number of individual pivoting rollers mounted in a double flange disposed at one or both ends of the hub shell. The pivoting action of the rollers permits each spoke to follow the straightest possible path to its fitting hole on the rim.
Description
Specification This invention relates to a double flanged roller assembly for securing spokes to a hub .
Nature of ~r~\,;ouslJ known systems and their d~ ? -In co"l/_nlional hub designs, elbow spokes pass through fitting holes in the hub's spoke flanges and secured in place by means of their enlarged head portions. The spoke is stretched between the hub and the wheel rim where it is l~:n~ioned with a nut, properly called a spoke nipple. Spoke fatigue failure in this system is primarily attributable to ~ s ,9 tensions produced by the rider's weight on the rolling wheel (loading and unloading with each wheel rotation), road shocks (bumps, road conditions, rough terrain,etc.), and to rider pedaling torque.
The most common point of elbow spoke fatigue failure isthe elbow-bend section. Elbow-bend material fatigue occurs when loose spok~
tension produces excessive spoke-play in the hub's spoke-holes, or if the distance between the spoke-head and me elbow-bend is great enough to produce play. In highly tensioned spokes, elbow-bend breakage can occur because of the intense shear and bending loads on the elbow's small single load bearing surface.
Most i, .aldnces of spoke breakage occur in rear multi-speed wheels where unequal spoke tension and uneven load distribution is u"a:c 'able because the fim is not centered on the hub but is offset (dished) to accommodate the added width of the freewheel gear cluster. Centefing the fim between the two axle locknuts ratherthan on thehub requiresthatfight-sidespokesbeundergreatertensionthan left-side spokes. This asymmetry in multi-speed rear wheels makes the spokes on the fight carry most of the load. Also, right-side spokes with elbows on the outside of the flange are more liable to breakage because they are bent to a more acute angle.
Another cause of spoke failure on the freewheel side (fight side) of rear wheels is hub wind-up. Hub wind-up is the rotation of the hub of a wheel with respect to the fim. Hub wind-up occurs dufing rider accelerdlion when peak torque loads are transmitted though the hub to the fim through the spokes. Co" ,/~nlional rear hubs used with elbow, straight head or screw-in spokes are more prone to spoke fatigue failure on the r.~e.. h eel side because of the torsional load ing of hub wind-up .
A further problem with elbow-bend spoke retention systems is that they fail to achieve the :.l, sht~l possible spoke line, a cfitical factor in building a strong wheel. In the example of tangentially (crossed) spoked wheels, the area where spokes bend as they enterthe hub and the fim must be supported by the hub flange and the nipple. If these bends are not supported, the spoke shaft, and therefore the spoke line, is not perfectly straight, contfibuting to spoke flex when the wheel is loaded. Spoke flex increases spoke fatigue and failure can occur after a few thousand stress cycles. To improve spoke line, dufing wheel assembly wheelbuilders use force to modify spoke elbow bends, manually pressing the spokes so that they confomm to the al~ iM~ al possible spoke line. Manually bending the spokes is a poor solution at best to the problem of ach~ ~i. ,9 the all _htt:sl possible spoke line.
The modified bend is apt to be improperly seated in the spoke hole subjecting the spoke to excessive flex and accelerated matefial fatigue.
To avoid the drawbacks of elbow bend spokes, some known hubs are drilled to use straight-head elbowless spokes. A drawback of known straight spoke retention systems is that they allow only the one spoking pattern for which the hub was designed.
S ! ~ of the ;...er.liGn The inventor has found that the disadvantages of known spoke dlldcl,-,-e--l systems can be overcome by providing a double flange and roller asse, ~ .bly disposed at one or both ends of the hub shell. The number of pivoting rollers corresponds to the number of spokes the hub was designed for. Straight spokes thread into, or pass through, their respective pivoting rollers in the double flange. The rotation of the rollers permits each spoke to follow the ~ hl~sl possible path to its fitting hole on the rim.
The particular object of the present invention is to prod uce a stronger wheel design by distributing the wheel's load over a greater surface area than in convenlional systems. Instead of a single small bearing surface (the spoke's elbow and fitting hole in the hub flange), the load-affected zone is spread across the width of the double flange and the rollers. This permits the wheel builder to use higher tensiolled spokes.
The strength of a wheel is measured by the greatest load it can carry:
the tighter the spokes, the greater the radial load capacity.
It is a further object of the present invention to provide a method of producing spoked wheels of the above----enliol-ed type in which elbow-bend spokes are replaced with straight spokes ~" lli~ 9 the problem of highly stressed spoke elbow sections. Straight radial spokes with or without heads may be used with the invention. Unlike conventional systems, the invention pemmits the use of straight spokes threaded at one or both ends. For example, at one end a straight spoke can be threaded to screw into the pivoting roller, while at the other end a cG,,.I_.-lional nipple is used. The advantage of screw-in spokes is reduced weight, greater strength, and the ~ ' 1l IdliOn of stress areas at the hub and at the rim. A siy"irica"l advantage of the present invention overco"~_nlional radial spoke retention systems isthe possibility of various spoke lacing pattems.
It is a further object of the present invention to provide a method of building a rear wheel which is less liable to spoke failure caused by hub wind up. The twisting of spokes during torque lldnSlll ~ ) is a aiy"irica"l cause of spoke material fatigue failure in rear wheels.
Because the present invention's spoke retention rollers are not rigid but rather rotate on their axis, spokes are less subject to the intense accele.dliùn and climbing-induced torsion caused by torque transmission.
Deso.i~,lion of the D.. :r.3s and Ol.erdtion of I .er.li.e Idea The features and advantages of the present invention will become apparent from the detailed descri,utiu,, of the invention's embodiments which are explained in the accompanying drawings, in which:
Figure 1 is an end view of the hub showing its double flange; and Figure 2 is a sectional view taken on line A-A in Figure 1; and Figure 3 includes a sectional view of the roller 1 and a sectional viewtaken on line A-A.
Figure 4 is a sectional view of the double flanged roller assembly rep,e:senli,.g an optional weight-saving method of attaching a spoke to the rim 7 and hub roller 1. Using an known spoke a-.dnge",ent, the spoke 4 is held on the rim 7 using a nippleless spoke head and screwed into the roller 1.
The invention illustrated comprises a double flange 2, 3 which has a plurality of spaced apart holes 5 through the outemmost flange 2 and a plurality of corresponding sockets 6 in the innemmost flange 3. A
cylindrical rotatable roller 1 is inserted through each hole 5 in the outemmost flange 2 until it comes to rest in the corresponding socket 6 in the innemmost flange 3. Each roller 1 has a hole passing through its center, the centerline of which passes through the centerline of the roller 1.
In the embodiment shown in Fig. 2, the hole in the roller is only wide enough to accommodate the shaft portion of a straight, elbowless spoke, and countersunk to accommodate the spoke head. Each spoke 4 passes through its respective pivoting roller 1, allowing the spoke 4to rotate to the :,I. shl~:sl possible spoke line to its fitting hole on the rim 6. Other embod iments may use spokes that thread into the roller, the rim, or both.
Nature of ~r~\,;ouslJ known systems and their d~ ? -In co"l/_nlional hub designs, elbow spokes pass through fitting holes in the hub's spoke flanges and secured in place by means of their enlarged head portions. The spoke is stretched between the hub and the wheel rim where it is l~:n~ioned with a nut, properly called a spoke nipple. Spoke fatigue failure in this system is primarily attributable to ~ s ,9 tensions produced by the rider's weight on the rolling wheel (loading and unloading with each wheel rotation), road shocks (bumps, road conditions, rough terrain,etc.), and to rider pedaling torque.
The most common point of elbow spoke fatigue failure isthe elbow-bend section. Elbow-bend material fatigue occurs when loose spok~
tension produces excessive spoke-play in the hub's spoke-holes, or if the distance between the spoke-head and me elbow-bend is great enough to produce play. In highly tensioned spokes, elbow-bend breakage can occur because of the intense shear and bending loads on the elbow's small single load bearing surface.
Most i, .aldnces of spoke breakage occur in rear multi-speed wheels where unequal spoke tension and uneven load distribution is u"a:c 'able because the fim is not centered on the hub but is offset (dished) to accommodate the added width of the freewheel gear cluster. Centefing the fim between the two axle locknuts ratherthan on thehub requiresthatfight-sidespokesbeundergreatertensionthan left-side spokes. This asymmetry in multi-speed rear wheels makes the spokes on the fight carry most of the load. Also, right-side spokes with elbows on the outside of the flange are more liable to breakage because they are bent to a more acute angle.
Another cause of spoke failure on the freewheel side (fight side) of rear wheels is hub wind-up. Hub wind-up is the rotation of the hub of a wheel with respect to the fim. Hub wind-up occurs dufing rider accelerdlion when peak torque loads are transmitted though the hub to the fim through the spokes. Co" ,/~nlional rear hubs used with elbow, straight head or screw-in spokes are more prone to spoke fatigue failure on the r.~e.. h eel side because of the torsional load ing of hub wind-up .
A further problem with elbow-bend spoke retention systems is that they fail to achieve the :.l, sht~l possible spoke line, a cfitical factor in building a strong wheel. In the example of tangentially (crossed) spoked wheels, the area where spokes bend as they enterthe hub and the fim must be supported by the hub flange and the nipple. If these bends are not supported, the spoke shaft, and therefore the spoke line, is not perfectly straight, contfibuting to spoke flex when the wheel is loaded. Spoke flex increases spoke fatigue and failure can occur after a few thousand stress cycles. To improve spoke line, dufing wheel assembly wheelbuilders use force to modify spoke elbow bends, manually pressing the spokes so that they confomm to the al~ iM~ al possible spoke line. Manually bending the spokes is a poor solution at best to the problem of ach~ ~i. ,9 the all _htt:sl possible spoke line.
The modified bend is apt to be improperly seated in the spoke hole subjecting the spoke to excessive flex and accelerated matefial fatigue.
To avoid the drawbacks of elbow bend spokes, some known hubs are drilled to use straight-head elbowless spokes. A drawback of known straight spoke retention systems is that they allow only the one spoking pattern for which the hub was designed.
S ! ~ of the ;...er.liGn The inventor has found that the disadvantages of known spoke dlldcl,-,-e--l systems can be overcome by providing a double flange and roller asse, ~ .bly disposed at one or both ends of the hub shell. The number of pivoting rollers corresponds to the number of spokes the hub was designed for. Straight spokes thread into, or pass through, their respective pivoting rollers in the double flange. The rotation of the rollers permits each spoke to follow the ~ hl~sl possible path to its fitting hole on the rim.
The particular object of the present invention is to prod uce a stronger wheel design by distributing the wheel's load over a greater surface area than in convenlional systems. Instead of a single small bearing surface (the spoke's elbow and fitting hole in the hub flange), the load-affected zone is spread across the width of the double flange and the rollers. This permits the wheel builder to use higher tensiolled spokes.
The strength of a wheel is measured by the greatest load it can carry:
the tighter the spokes, the greater the radial load capacity.
It is a further object of the present invention to provide a method of producing spoked wheels of the above----enliol-ed type in which elbow-bend spokes are replaced with straight spokes ~" lli~ 9 the problem of highly stressed spoke elbow sections. Straight radial spokes with or without heads may be used with the invention. Unlike conventional systems, the invention pemmits the use of straight spokes threaded at one or both ends. For example, at one end a straight spoke can be threaded to screw into the pivoting roller, while at the other end a cG,,.I_.-lional nipple is used. The advantage of screw-in spokes is reduced weight, greater strength, and the ~ ' 1l IdliOn of stress areas at the hub and at the rim. A siy"irica"l advantage of the present invention overco"~_nlional radial spoke retention systems isthe possibility of various spoke lacing pattems.
It is a further object of the present invention to provide a method of building a rear wheel which is less liable to spoke failure caused by hub wind up. The twisting of spokes during torque lldnSlll ~ ) is a aiy"irica"l cause of spoke material fatigue failure in rear wheels.
Because the present invention's spoke retention rollers are not rigid but rather rotate on their axis, spokes are less subject to the intense accele.dliùn and climbing-induced torsion caused by torque transmission.
Deso.i~,lion of the D.. :r.3s and Ol.erdtion of I .er.li.e Idea The features and advantages of the present invention will become apparent from the detailed descri,utiu,, of the invention's embodiments which are explained in the accompanying drawings, in which:
Figure 1 is an end view of the hub showing its double flange; and Figure 2 is a sectional view taken on line A-A in Figure 1; and Figure 3 includes a sectional view of the roller 1 and a sectional viewtaken on line A-A.
Figure 4 is a sectional view of the double flanged roller assembly rep,e:senli,.g an optional weight-saving method of attaching a spoke to the rim 7 and hub roller 1. Using an known spoke a-.dnge",ent, the spoke 4 is held on the rim 7 using a nippleless spoke head and screwed into the roller 1.
The invention illustrated comprises a double flange 2, 3 which has a plurality of spaced apart holes 5 through the outemmost flange 2 and a plurality of corresponding sockets 6 in the innemmost flange 3. A
cylindrical rotatable roller 1 is inserted through each hole 5 in the outemmost flange 2 until it comes to rest in the corresponding socket 6 in the innemmost flange 3. Each roller 1 has a hole passing through its center, the centerline of which passes through the centerline of the roller 1.
In the embodiment shown in Fig. 2, the hole in the roller is only wide enough to accommodate the shaft portion of a straight, elbowless spoke, and countersunk to accommodate the spoke head. Each spoke 4 passes through its respective pivoting roller 1, allowing the spoke 4to rotate to the :,I. shl~:sl possible spoke line to its fitting hole on the rim 6. Other embod iments may use spokes that thread into the roller, the rim, or both.
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2202931 CA2202931A1 (en) | 1997-04-17 | 1997-04-17 | Double flanged roller system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2202931 CA2202931A1 (en) | 1997-04-17 | 1997-04-17 | Double flanged roller system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2202931A1 true CA2202931A1 (en) | 1998-10-17 |
Family
ID=4160445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2202931 Abandoned CA2202931A1 (en) | 1997-04-17 | 1997-04-17 | Double flanged roller system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2202931A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022051714A1 (en) * | 2020-09-06 | 2022-03-10 | Berd L.L.C. | Hub for retaining spokes with loops |
-
1997
- 1997-04-17 CA CA 2202931 patent/CA2202931A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022051714A1 (en) * | 2020-09-06 | 2022-03-10 | Berd L.L.C. | Hub for retaining spokes with loops |
| US11951768B2 (en) | 2020-09-06 | 2024-04-09 | Berd L.L.C. | Hub for retaining spokes with loops |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |