CA2007734A1 - Expansion ring for a vehicle wheel - Google Patents
Expansion ring for a vehicle wheelInfo
- Publication number
- CA2007734A1 CA2007734A1 CA002007734A CA2007734A CA2007734A1 CA 2007734 A1 CA2007734 A1 CA 2007734A1 CA 002007734 A CA002007734 A CA 002007734A CA 2007734 A CA2007734 A CA 2007734A CA 2007734 A1 CA2007734 A1 CA 2007734A1
- Authority
- CA
- Canada
- Prior art keywords
- grooves
- expansion ring
- section
- rim
- wheel
- 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
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/02—Seating or securing beads on rims
- B60C15/028—Spacers between beads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B21/00—Rims
- B60B21/12—Appurtenances, e.g. lining bands
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
ABSTRACT
An expansion ring for a vehicle wheel, wherein the wheel includes at least a rim and a tubeless pneumatic tire. The expansion ring includes wire bundle reinforcement for securing the beads of the tire on the shoulders of the rim.
The expansion ring is formed from a profiled section which is cut to the length of the circumference of the rim shoulders and includes continuous longitudinal grooves in its outer surface. Wire bundle rings or cable bundle rings are positioned in the grooves. The expansion ring is characterized by a reduced weight and a cost-efficient manufacture and yet provides a sufficient expansion force for maintaining the beads of a tire against the rim shoulders even at very low air pressures.
An expansion ring for a vehicle wheel, wherein the wheel includes at least a rim and a tubeless pneumatic tire. The expansion ring includes wire bundle reinforcement for securing the beads of the tire on the shoulders of the rim.
The expansion ring is formed from a profiled section which is cut to the length of the circumference of the rim shoulders and includes continuous longitudinal grooves in its outer surface. Wire bundle rings or cable bundle rings are positioned in the grooves. The expansion ring is characterized by a reduced weight and a cost-efficient manufacture and yet provides a sufficient expansion force for maintaining the beads of a tire against the rim shoulders even at very low air pressures.
Description
29 3~773~L
:,' EXPANSION RING FOR A VE~ICLE ~H~L
, .
The invention relates to an expansion rinB for a vehicle wheel including a rim and a tubeless pneumatic tire. The expansion ring holds the tire beads in place on the shoulders of the rim. The invention especially relates to expansion rings with wire strand reinforcement.
Expansion rings for vehicle wheels generally provide for a reliable positioning of a pneumatic tire on a rim, even at low tire pressures, so that unwanted separation of the tire from the rim is generally prevented.
The expanding action of the expansion ring holds the tire beads on the shoulders of the rim by engaging the tire beads against the rim flange and, in compound rims, against a rim flange and a side ring. Therefore, at low tire pressures, the action of the expansion ring on the tire side walls replaces the force of the air pressure. Expansion rings of the prior art generally comprise a ring of hard rubber having wire strand reinforcements completely embedded ln the hard rubber. The manufacture of such expansion rings is difficult, since the wire strand reinforcement has to be embedded into the ring according to an exact distribution pattern. This requires the use of expensive special dies in the manufacture of the expansion ring, leading to high manufacturing cost. In addition, expansion rings oE the prior art are generally relatively heavy.
The inven~ion provides a vehicle wheel as generally described above, wherein the expansion ring is of lower weight relative to prior art expansion rings, is produced by a relativel~v simple, cost-efficient manufacturing process and still provides an expanding action sufficient to hold the tire beads on the flanges of the rim even at very low air pressures. An expansion ring in accordance with the invention is formed with a proi~iled cross-section, the ring conforming to the circumference of the rim shoulders or the tire beads. The ring has parallel, ., .
circumferentially extending grooves in its outer circumferential surface and bundled wire strands or cables are located in such grooves. Therefore, the expansion ring may be manuactured from an extruded section having these longitudinal grooves, which are transformed to circumferentially extending grooves when the sectlon is cut to length and formed into a circle to form the expansion ring and provide for the insertion of wire bundle 773~ .
reinforcement rings in the grooves during the manufacture of the expanslon ring. Thus, the requirement to use expensive dies for the manuEacture of the expansion rings is substantially obviated and a well defined and controlled positioning of the wire bundle reinforcement rings is achieved.
; 5 Furthermore, the difficult process of embedding the reinforcing wire strands directly into the expansion ring during the manufacture thereof as in the prior art rings is obviated. The grooves in the expansion ring of the invention furthermore provide for a reduction in the overall weight. It is surprising that with an expansion ring of reduced cross-section as in the preæent invention, a sufficient expansion force ccm be achieved. However, the expansion ring of the invention provides an e~pansion force which is - sufficient to fix the tire beads on the shoulders of the rim, even at extremely low air pressures in the tire. This is especially apparent when, in accordance with the invention, the wire bundles are~positioned in the grooves with a selected pretension. Therefore, the invention provides for the cost-efficient manufacture of an expansion ring of reduced weight.
In a preferred embodiment, ~he profiled ring section is a plastic extrusion or a cast hard rubber section. This is especially advantageous for production of the expansion rlng. Preferably, the profiled section is cut to length, formed into a circle to form the expansion ring and vulcanized, the mating end surfaces of the section bein8 cut (for example, mitered) to exactly and completely abut one another in the circularized condition of the section. Subsequently, the wire bundles are positioned in the grooves of the circularized section to reinforce the expansion ring.
The wire bundles are preferably composed of cables such as tire reinforcement cables, which extend in side by side and/or stacked relationship and are embedded in vulcanized material. Preferably, eight wires positioned side by side are simultaneously guided through an extrusion die and enclosed by an unvulcanized mixture to form a rectangular, unvulcanized wire bundle. This wire bundle is vulcanized in a boiler using pressurized steam. The number o~ single wires as well as the number of ; layers of such wires and the positioning of the wires in the wire bundle may be varied without departing from the scope of the inventlon. The circularized, profiled section includes at least one, preferably two, - 35 opposingly positioned radial bores which can be aligned with the valve ., .
;~ 7~
generally mounted on the rim for inflation of a pneumatic tire mounted thereon during the installation of the expansion ring in order to allow a supply of pressurized air to the tubeless pneumatic tire. The circularized profiled section preferably includes several circumferential grooves as aforesald, which may be positioned side by side and at different distances from the centre of the ring. In accordance with t:he invention, the axially outer grooves preferably describe circles of larger diameters than the axially inner grooves. This optimizes the action of the expansion ring.
The invention will now be further explained by way of example only and with reference to the following drawings, wherein:
Figure 1 is part of a radial cross-section through a vehicle wheel incorporating an expansion ring in accordance with the invention: and ; Figure 2 is a cross-section through the profiled section of theexpansion rinB of Flgure 1, prior to being formed into the ring.
The drawings show a vehicle wheel including a compound rim 1, a tubeless pneumatic tire 2 and a wire strand reinforced expansion ring 3 positioned on the rim 1 to hold the tire beads 4 on the respective shoulders 5 of the rim 1, by providing a lateral force for pressing the tire beads 4 against a rim flange 6 and a side ring 7 of the compound rim, respectlvely.
~ide ring 7 is combined with a Eas~ener ring 8 and a seal ring 9. A valve i 10 is positioned on the rim 1. The expansion rin8 3 is made from a profiled section which is provided with longitudinal grooves 11 in its outer surface and is cut to a length corresponding to the circumference of the rim shoulders 5 or the tire beads 4. Wire bundle reinforcement rings 12 are positioned in the grooves 11. Profiled section 3 is an extruded plastic section, and its ends are complementarily mitered at right angles. The section is formed into a circle with the mitered ends brought together and subsequently vulcanized. The circularized section is provided with at least one radial bore 13 adapted to align with the opening 14 from valve 10 in order to permit pressurized air to enter the pneuma~ic tubeless tire 2. The wire bundle rings 12 are positioned in the grooves 11 with a selected pretension, several grooves 11 being positioned side by side and describing circles of different diameters. The axially outer grooves describe circles of larger dia=etere tha= the ax~ally Inner g~oovee.
.
~ .
. : . : : . .
.. .. ~ . .
:,' EXPANSION RING FOR A VE~ICLE ~H~L
, .
The invention relates to an expansion rinB for a vehicle wheel including a rim and a tubeless pneumatic tire. The expansion ring holds the tire beads in place on the shoulders of the rim. The invention especially relates to expansion rings with wire strand reinforcement.
Expansion rings for vehicle wheels generally provide for a reliable positioning of a pneumatic tire on a rim, even at low tire pressures, so that unwanted separation of the tire from the rim is generally prevented.
The expanding action of the expansion ring holds the tire beads on the shoulders of the rim by engaging the tire beads against the rim flange and, in compound rims, against a rim flange and a side ring. Therefore, at low tire pressures, the action of the expansion ring on the tire side walls replaces the force of the air pressure. Expansion rings of the prior art generally comprise a ring of hard rubber having wire strand reinforcements completely embedded ln the hard rubber. The manufacture of such expansion rings is difficult, since the wire strand reinforcement has to be embedded into the ring according to an exact distribution pattern. This requires the use of expensive special dies in the manufacture of the expansion ring, leading to high manufacturing cost. In addition, expansion rings oE the prior art are generally relatively heavy.
The inven~ion provides a vehicle wheel as generally described above, wherein the expansion ring is of lower weight relative to prior art expansion rings, is produced by a relativel~v simple, cost-efficient manufacturing process and still provides an expanding action sufficient to hold the tire beads on the flanges of the rim even at very low air pressures. An expansion ring in accordance with the invention is formed with a proi~iled cross-section, the ring conforming to the circumference of the rim shoulders or the tire beads. The ring has parallel, ., .
circumferentially extending grooves in its outer circumferential surface and bundled wire strands or cables are located in such grooves. Therefore, the expansion ring may be manuactured from an extruded section having these longitudinal grooves, which are transformed to circumferentially extending grooves when the sectlon is cut to length and formed into a circle to form the expansion ring and provide for the insertion of wire bundle 773~ .
reinforcement rings in the grooves during the manufacture of the expanslon ring. Thus, the requirement to use expensive dies for the manuEacture of the expansion rings is substantially obviated and a well defined and controlled positioning of the wire bundle reinforcement rings is achieved.
; 5 Furthermore, the difficult process of embedding the reinforcing wire strands directly into the expansion ring during the manufacture thereof as in the prior art rings is obviated. The grooves in the expansion ring of the invention furthermore provide for a reduction in the overall weight. It is surprising that with an expansion ring of reduced cross-section as in the preæent invention, a sufficient expansion force ccm be achieved. However, the expansion ring of the invention provides an e~pansion force which is - sufficient to fix the tire beads on the shoulders of the rim, even at extremely low air pressures in the tire. This is especially apparent when, in accordance with the invention, the wire bundles are~positioned in the grooves with a selected pretension. Therefore, the invention provides for the cost-efficient manufacture of an expansion ring of reduced weight.
In a preferred embodiment, ~he profiled ring section is a plastic extrusion or a cast hard rubber section. This is especially advantageous for production of the expansion rlng. Preferably, the profiled section is cut to length, formed into a circle to form the expansion ring and vulcanized, the mating end surfaces of the section bein8 cut (for example, mitered) to exactly and completely abut one another in the circularized condition of the section. Subsequently, the wire bundles are positioned in the grooves of the circularized section to reinforce the expansion ring.
The wire bundles are preferably composed of cables such as tire reinforcement cables, which extend in side by side and/or stacked relationship and are embedded in vulcanized material. Preferably, eight wires positioned side by side are simultaneously guided through an extrusion die and enclosed by an unvulcanized mixture to form a rectangular, unvulcanized wire bundle. This wire bundle is vulcanized in a boiler using pressurized steam. The number o~ single wires as well as the number of ; layers of such wires and the positioning of the wires in the wire bundle may be varied without departing from the scope of the inventlon. The circularized, profiled section includes at least one, preferably two, - 35 opposingly positioned radial bores which can be aligned with the valve ., .
;~ 7~
generally mounted on the rim for inflation of a pneumatic tire mounted thereon during the installation of the expansion ring in order to allow a supply of pressurized air to the tubeless pneumatic tire. The circularized profiled section preferably includes several circumferential grooves as aforesald, which may be positioned side by side and at different distances from the centre of the ring. In accordance with t:he invention, the axially outer grooves preferably describe circles of larger diameters than the axially inner grooves. This optimizes the action of the expansion ring.
The invention will now be further explained by way of example only and with reference to the following drawings, wherein:
Figure 1 is part of a radial cross-section through a vehicle wheel incorporating an expansion ring in accordance with the invention: and ; Figure 2 is a cross-section through the profiled section of theexpansion rinB of Flgure 1, prior to being formed into the ring.
The drawings show a vehicle wheel including a compound rim 1, a tubeless pneumatic tire 2 and a wire strand reinforced expansion ring 3 positioned on the rim 1 to hold the tire beads 4 on the respective shoulders 5 of the rim 1, by providing a lateral force for pressing the tire beads 4 against a rim flange 6 and a side ring 7 of the compound rim, respectlvely.
~ide ring 7 is combined with a Eas~ener ring 8 and a seal ring 9. A valve i 10 is positioned on the rim 1. The expansion rin8 3 is made from a profiled section which is provided with longitudinal grooves 11 in its outer surface and is cut to a length corresponding to the circumference of the rim shoulders 5 or the tire beads 4. Wire bundle reinforcement rings 12 are positioned in the grooves 11. Profiled section 3 is an extruded plastic section, and its ends are complementarily mitered at right angles. The section is formed into a circle with the mitered ends brought together and subsequently vulcanized. The circularized section is provided with at least one radial bore 13 adapted to align with the opening 14 from valve 10 in order to permit pressurized air to enter the pneuma~ic tubeless tire 2. The wire bundle rings 12 are positioned in the grooves 11 with a selected pretension, several grooves 11 being positioned side by side and describing circles of different diameters. The axially outer grooves describe circles of larger dia=etere tha= the ax~ally Inner g~oovee.
.
~ .
. : . : : . .
.. .. ~ . .
Claims (16)
1. An expansion ring for use in a vehicle wheel including a rim and a tubeless pneumatic tire, said expansion ring securing the beads of the tubeless pneumatic tire onto the shoulders of the rim and comprising:
a profiled section cut to the length of the circumference of said shoulders and formed into a circle, said section having circumferentially extending grooves in its outer surface and wire bundle reinforcement rings positioned in said grooves.
a profiled section cut to the length of the circumference of said shoulders and formed into a circle, said section having circumferentially extending grooves in its outer surface and wire bundle reinforcement rings positioned in said grooves.
2. An expansion ring as defined in claim 1, wherein said profiled section is a cast section of hard rubber material or an extruded plastic section.
3. An expansion ring as defined in claim 2, wherein said profiled section is cut to length, its ends complementarily mitered at right angles brought together, and subsequently vulcanized.
4. An expansion ring as defined in claim 3, wherein said circularized profiled section includes at least one radial bore.
5. An expansion ring as defined in claim 4, wherein said wire bundle rings include wires which are positioned in side by side and/or stacked relationship and are embedded in vulcanized material.
6. An expansion ring as defined in claim 5, wherein said wire bundle rings in said grooves have a selected pretension.
7. An expansion ring as defined in claim 6, wherein at least two of said grooves are positioned side by side.
8. An expansion ring as defined in claim 7, wherein the respectively outer grooves of said side by side positioned grooves describe circles of larger diameters than the respective inner grooves.
9. A vehicle wheel comprising an expansion ring, a rim and a tubeless pneumatic tire, said expansion ring securing the beads of the tubeless pneumatic tire onto the shoulders of the rim and comprising:
a profiled section cut to the length of the circumference of said shoulders and formed into a circle, said section having circumferentially extending grooves in its outer surface and wire bundle reinforcement rings positioned in said grooves.
a profiled section cut to the length of the circumference of said shoulders and formed into a circle, said section having circumferentially extending grooves in its outer surface and wire bundle reinforcement rings positioned in said grooves.
10. A wheel as defined in claim 9, wherein said profiled section is a cast section of hard rubber material or an extruded plastic section.
11. A wheel as defined in claim 10, wherein said profiled section is cut to length, its ends complementarily mitered at right angles brought together, and subsequently vulcanized.
12. A wheel as defined in claim 11, wherein said circularized profiled section includes at least one radial bore.
13. A wheel as defined in claim 12, wherein said wire bundle rings include wires which are positioned in side by side and/or stacked relationship and are embedded in vulcanized material.
14. An wheel as defined in claim 13, wherein said wire bundle rings in said grooves have a selected pretension.
15. A wheel as defined in claim 14, wherein at least two of said grooves are positioned side by side.
16. An wheel as defined in claim 15, wherein the respectively outer grooves of said side by side positioned grooves describe circles of larger diameters than the respective inner grooves.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE8900337U DE8900337U1 (en) | 1989-01-13 | 1989-01-13 | |
| DEG8900337.3 | 1989-01-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2007734A1 true CA2007734A1 (en) | 1990-07-13 |
Family
ID=6835020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002007734A Abandoned CA2007734A1 (en) | 1989-01-13 | 1990-01-15 | Expansion ring for a vehicle wheel |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0382912A1 (en) |
| CA (1) | CA2007734A1 (en) |
| DE (1) | DE8900337U1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4317268A1 (en) * | 1993-05-24 | 1994-12-01 | Josef Piller | Dividable rim with a mount for tyres having a covering sheath |
| FR2773745A1 (en) * | 1998-01-20 | 1999-07-23 | Michelin & Cie | Pneumatic tire designed for exceptionally simple fitting and dismounting using compressed air and reduced pressure source |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2381382A (en) * | 1941-08-22 | 1945-08-07 | Firestone Tire & Rubber Co | Bead lock |
| GB1417854A (en) * | 1972-05-26 | 1975-12-17 | Rubery Owen & Co Ltd | Pneumatic tyre and vehicle wheel assembly |
| DE2405141A1 (en) * | 1974-01-31 | 1975-08-14 | Kronprinz Ag | VEHICLE WHEEL WITH LOW BED RIM |
| US4173243A (en) * | 1975-10-17 | 1979-11-06 | Dunlop Limited | Safety tire and wheel rim assembly |
| GB1530817A (en) * | 1975-11-12 | 1978-11-01 | Goodyear Tire & Rubber | Wheel well filler and retainer |
| US4662419A (en) * | 1986-02-06 | 1987-05-05 | Astronics Corporation | Beadlock for tubeless tires |
-
1989
- 1989-01-13 DE DE8900337U patent/DE8900337U1/de not_active Expired
- 1989-12-08 EP EP89122640A patent/EP0382912A1/en not_active Withdrawn
-
1990
- 1990-01-15 CA CA002007734A patent/CA2007734A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE8900337U1 (en) | 1989-03-02 |
| EP0382912A1 (en) | 1990-08-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |