WO2008044035A1 - Segmental tyre - Google Patents
Segmental tyre Download PDFInfo
- Publication number
- WO2008044035A1 WO2008044035A1 PCT/GB2007/003872 GB2007003872W WO2008044035A1 WO 2008044035 A1 WO2008044035 A1 WO 2008044035A1 GB 2007003872 W GB2007003872 W GB 2007003872W WO 2008044035 A1 WO2008044035 A1 WO 2008044035A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tyre
- hub
- segmental
- segments
- stud
- Prior art date
Links
- 239000002861 polymer material Substances 0.000 claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 13
- 239000000377 silicon dioxide Substances 0.000 claims description 10
- 229920000642 polymer Polymers 0.000 claims description 6
- 239000000203 mixture Substances 0.000 description 4
- 235000013305 food Nutrition 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000000825 pharmaceutical preparation Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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
- B60C7/00—Non-inflatable or solid tyres
- B60C7/08—Non-inflatable or solid tyres built-up from a plurality of arcuate parts
Definitions
- Segmental Tyre This invention relates to a segmental tyre.
- Segmental tyres are well known and typically comprise a plurality of tyre segments bolted, clamped or otherwise secured to a central hub.
- Each tyre segment typically includes an inner wall adapted, in use, to engage the hub, an outer wall shaped to define a tread pattern, and interconnecting walls connecting the inner and outer walls to one another.
- the inner, outer and interconnecting walls are typically formed integrally with one another, and typically together define a cavity allowing the outer wall to deflect, in use, for example to conform with the surface upon or over which the tyre is driven.
- tyre segment In use, minor damage to a tyre segment, for example a small split or cut, tends to migrate across the segment when the associated wheel is rotated whilst under load. Such migration may result in sections of the segment becoming significantly weakened or even in sections becoming detached. Under such circumstances the segment may need to be replaced and this causes the vehicle upon which the segmental tyre is used to be taken out of use. Obviously this is undesirable.
- segmental tyres tend to leave marks on the surface over which they are driven, and this is undesirable particularly if used in clean environments, for example in which foods or pharmaceuticals are processed or handled.
- segmental tyres Another disadvantage with known segmental tyres is that correctly fitting the segments in position is difficult.
- Typical segments include a threaded stud, a head of which is secured to a plate encapsulated in the rubber or rubber-like material of the segment. When fitting the segment, it is important to ensure that precisely the desired load is applied when tightening a nut onto the stud. The presence of rubber or rubber- like material between the plate and the hub to which the segment is mounted makes this difficult to achieve.
- a segmental tyre comprising a plurality of segments secured to a hub, at least one of the segments including a moulded polymer material component moulded from a material including silica.
- silica in the material reduces the migration of splits and cuts across the segment.
- the silica makes up approximately 10-20 pphr of the material, conveniently about 16 pphr.
- the invention also relates to a segment for use in such a tyre.
- a segmental tyre comprising a plurality of segments secured to a hub, at least one of the segments including a moulded polymer component moulded from a material which is white.
- Such an arrangement avoids leaving black marks on surfaces over which the tyre is driven and thus is suitable for use in clean areas including food or pharmaceutical preparation or handling areas.
- the invention also relates to a segment suitable for use in such a tyre.
- a segmental tyre comprising a plurality of segments secured to a hub, at least one of the segments comprising a mounting plate moulded into a polymer material component, the mounting plate having at least one securing component mounted thereon, wherein at least part of the mounting plate engages the hub.
- Such an arrangement is advantageous in that the tightening load applied thereto can be precisely controlled. Additionally, where the securing components comprise screw-threaded studs, they can be of reduced length.
- This invention also relates to a segment suitable for use in such a tyre.
- Figure 1 is a diagrammatic view illustrating part of a segmental tyre
- Figure 2 is a view illustrating one of the segments of the tyre of Figure 1.
- the segmented tyre arrangement illustrated diagrammatically in Figures 1 and 2 comprises a hub 10 of generally cylindrical form upon which a plurality of tyre segments 12 are mounted.
- Each tyre segment 12 comprises a polymer material moulded component 12a from which a stud 14 extends, the studs 14 extending through openings formed in the hub 10 and having screw-threaded nuts 16 mounted thereon to secure the segments 12 to the hub 10.
- the polymer moulded component 12a of each segment 12 includes an inner wall 18 arranged to engage the outer surface of the hub 10, an outer wall 20 upon or in which treads 22 are formed, the treads 22 engaging, in use, the surface over which the tyre is driven, and interconnecting walls 24 connecting the inner and outer walls 18, 20 to one another.
- the inner and outer walls 18, 20 and interconnecting walls 24 together define hollows 26 allowing resilient deformation of the component 12a, in use.
- the polymer component 12a in order to reduce the risk of small slits or cuts propagating along the polymer component 12a of each segment 12, the polymer component 12a is formed from a composition incorporating silica. It has been found that the incorporation of silica into the material tends to resist such migration of splits or cuts, therefore reducing the risk of parts of the component 12a becoming weakened or breaking off.
- Table 1 (below) provides details of a preferred composition for the material. However, it will be appreciated that the quantity of silica provided may depart from that set out in Table 1. For example it may fall in the range 10-20 pphr.
- composition set out in Table 1 is of black form, if desired the composition may be modified to omit the black pigments and instead the moulded component 12a of the segment 12 will be coloured white.
- the provision of white treads may be advantageous where the segmental tyre is to be used in a clean environment, for example in an area in which food of pharmaceuticals are prepared or handled, as the use of a tyre of white colour avoids leaving black tyre marks on the surface over which the tyre is driven.
- each segment 12 incorporates a plate 30 moulded into the polymer moulded component 12a.
- Welded to the plate 30 is the screw-threaded stud 14.
- the shape of the plate 30 is such that although for the most part it is embedded within the polymer material of the component 12a, a part 32 thereof is exposed at the inner wall 18 of the component and, in use, bears against the outer surface of the hub 10. This is advantageous in that during fitting of the segment 1 2 to the hub 10, as the nut 16 is tightened onto the screw-threaded stud 14, plasties material is not compressed between the part 32 of the plate 30 and the hub 10 but rather the part 32 bears directly against the hub 10. Consequently, the nut 16 can be tightened to a precisely defined degree. Typically, the nut 16 is tightened to a torque in the range of 7 to 20 ft-lb. The tightening torque will depend upon, for example, the tyre size.
- the use of a plate 30 shaped such that a part 32 thereof is exposed at the wall 18 is advantageous in that, compared to arrangements in which the plate is not exposed, the stud 14 can be or reduced length.
- a stud of length 25mm can be used, typical arrangements requiring a stud of 30mm length.
- the shaping of the plate 30 allows a round headed stud to be used, typical arrangements requiring a hexagonal headed stud, and the shape of the metal plate 30 further allows an automated welding process, for example, induction welding to be used in the assembly of the plate 30 and associated studs 14.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Tires In General (AREA)
Abstract
A segmental tyre comprises a plurality of segments (12) secured to a hub (10), at least one of the segments (12) comprising a mounting plate (30) moulded into a polymer material component (12a), the mounting plate (30) having at least one securing (component 14) mounted thereon, wherein at least part of the mounting plate (30) engages the hub (10).
Description
Segmental Tyre This invention relates to a segmental tyre.
Segmental tyres are well known and typically comprise a plurality of tyre segments bolted, clamped or otherwise secured to a central hub. Each tyre segment typically includes an inner wall adapted, in use, to engage the hub, an outer wall shaped to define a tread pattern, and interconnecting walls connecting the inner and outer walls to one another. The inner, outer and interconnecting walls are typically formed integrally with one another, and typically together define a cavity allowing the outer wall to deflect, in use, for example to conform with the surface upon or over which the tyre is driven.
In use, minor damage to a tyre segment, for example a small split or cut, tends to migrate across the segment when the associated wheel is rotated whilst under load. Such migration may result in sections of the segment becoming significantly weakened or even in sections becoming detached. Under such circumstances the segment may need to be replaced and this causes the vehicle upon which the segmental tyre is used to be taken out of use. Obviously this is undesirable.
A further disadvantage with known segmental tyres is that they tend to leave marks on the surface over which they are driven, and this is undesirable particularly if used in clean environments, for example in which foods or pharmaceuticals are processed or handled.
Another disadvantage with known segmental tyres is that correctly fitting the segments in position is difficult. Typical segments include a threaded stud, a head of which is secured to a plate encapsulated in the rubber or rubber-like material of the segment. When fitting the segment, it is important to ensure that precisely the desired load is applied when tightening a nut onto the stud. The presence of rubber or rubber- like material between the plate and the hub to which the segment is mounted makes this difficult to achieve.
It is an object of the invention to provide a segmental tyre, and a segment for use therein, wherein the disadvantages set out above are overcome.
According to one aspect of the invention there is provided a segmental tyre comprising a plurality of segments secured to a hub, at least one of the segments including a moulded polymer material component moulded from a material including silica.
It has been found that the use of silica in the material reduces the migration of splits and cuts across the segment.
Preferably, the silica makes up approximately 10-20 pphr of the material, conveniently about 16 pphr.
The invention also relates to a segment for use in such a tyre.
According to another aspect of the invention there is provided a segmental tyre comprising a plurality of segments secured to a hub, at least one of the segments including a moulded polymer component moulded from a material which is white.
Such an arrangement avoids leaving black marks on surfaces over which the tyre is driven and thus is suitable for use in clean areas including food or pharmaceutical preparation or handling areas.
The invention also relates to a segment suitable for use in such a tyre.
According to a further aspect of the invention there is provided a segmental tyre comprising a plurality of segments secured to a hub, at least one of the segments comprising a mounting plate moulded into a polymer material component, the mounting plate having at least one securing component mounted thereon, wherein at least part of the mounting plate engages the hub.
Such an arrangement is advantageous in that the tightening load applied thereto can be precisely controlled. Additionally, where the securing components comprise screw-threaded studs, they can be of reduced length.
This invention also relates to a segment suitable for use in such a tyre.
The invention will further be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a diagrammatic view illustrating part of a segmental tyre; and
Figure 2 is a view illustrating one of the segments of the tyre of Figure 1.
The segmented tyre arrangement illustrated diagrammatically in Figures 1 and 2 comprises a hub 10 of generally cylindrical form upon which a plurality of tyre segments 12 are mounted. Each tyre segment 12 comprises a polymer material moulded component 12a from which a stud 14 extends, the studs 14 extending through openings formed in the hub 10 and having screw-threaded nuts 16 mounted thereon to secure the segments 12 to the hub 10. In common with many designs of segmental tyre, the polymer moulded component 12a of each segment 12 includes an inner wall 18 arranged to engage the outer surface of the hub 10, an outer wall 20 upon or in which treads 22 are formed, the treads 22 engaging, in use, the surface over which the tyre is driven, and interconnecting walls 24 connecting the inner and outer walls 18, 20 to one another. The inner and outer walls 18, 20 and interconnecting walls 24 together define hollows 26 allowing resilient deformation of the component 12a, in use.
In accordance with one aspect of the invention, in order to reduce the risk of small slits or cuts propagating along the polymer component 12a of each segment 12, the polymer component 12a is formed from a composition incorporating silica. It has been found that the incorporation of silica into the material tends to resist such migration of splits or cuts, therefore reducing the risk of parts of the component 12a becoming weakened or breaking off. Table 1 (below) provides details of a preferred composition for the material. However, it will be appreciated that the quantity of silica
provided may depart from that set out in Table 1. For example it may fall in the range 10-20 pphr.
TABLE l
Ingredient pppplhr (parts per hundred resin)
SMR20 80
SBRl 502 20
PVI .4
N330 Black 58
Silica 16
Stearic acid 7
Zinc Oxide 5
TMQ 2
6PPD 2
Paraffin wax 3
MBS 80% 1.2
DPG 80% .8
Sulphur 3
Naphthenic oil 8
Total 206.4
Although the composition set out in Table 1 is of black form, if desired the composition may be modified to omit the black pigments and instead the moulded component 12a of the segment 12 will be coloured white. The provision of white treads may be advantageous where the segmental tyre is to be used in a clean environment, for example in an area in which food of pharmaceuticals are prepared or handled, as the use of a tyre of white colour avoids leaving black tyre marks on the surface over which the tyre is driven.
As illustrated in Figure 2, each segment 12 incorporates a plate 30 moulded into the polymer moulded component 12a. Welded to the plate 30 is the screw-threaded stud
14. The shape of the plate 30 is such that although for the most part it is embedded within the polymer material of the component 12a, a part 32 thereof is exposed at the inner wall 18 of the component and, in use, bears against the outer surface of the hub 10. This is advantageous in that during fitting of the segment 1 2 to the hub 10, as the nut 16 is tightened onto the screw-threaded stud 14, plasties material is not compressed between the part 32 of the plate 30 and the hub 10 but rather the part 32 bears directly against the hub 10. Consequently, the nut 16 can be tightened to a precisely defined degree. Typically, the nut 16 is tightened to a torque in the range of 7 to 20 ft-lb. The tightening torque will depend upon, for example, the tyre size.
As well as enabling the tightening load to be precisely obtained, the use of a plate 30 shaped such that a part 32 thereof is exposed at the wall 18 is advantageous in that, compared to arrangements in which the plate is not exposed, the stud 14 can be or reduced length. By way of example, it is thought that a stud of length 25mm can be used, typical arrangements requiring a stud of 30mm length. Further, the shaping of the plate 30 allows a round headed stud to be used, typical arrangements requiring a hexagonal headed stud, and the shape of the metal plate 30 further allows an automated welding process, for example, induction welding to be used in the assembly of the plate 30 and associated studs 14.
It will be appreciated that a range of modifications and alterations to the arrangement described hereinbefore may be made without departing from the scope of the invention.
Claims
1. A segmental tyre comprising a plurality of segments secured to a hub, at least one of the segments comprising a mounting plate moulded into a polymer material component, the mounting plate having at least one securing component mounted thereon, wherein at least part of the mounting plate engages the hub.
2. A tyre according to Claim 1, wherein the securing component comprises a screw-threaded stud.
3. A tyre according to Claim 2, further comprising a nut mounted upon the stud.
4. A tyre according to Claim 3, wherein the nut is tightened to a torque in the range of 7 to 20 ft-lb.
5. A tyre according to any of Claims 2 to 4, wherein the stud is of length 25mm.
6. A tyre according to any of Claims 2 to 5, wherein the stud is a round headed stud.
7. A tyre according to any of Claims 2 to 6, wherein the stud is welded to the mounting plate.
8. A segmental tyre comprising a plurality of segments secured to a hub, at least one of the segments including a moulded polymer material component moulded from a material including silica.
9. A tyre according to Claim 8, wherein the silica makes up approximately 10-20 pphr of the material.
10. A tyre according to Claim 9, wherein the silica makes up about 16 pphr of the material.
11. A segmental tyre comprising a plurality of segments secured to a hub, at least one of the segments including a moulded polymer component moulded from a material which is white.
12. A tyre segment adapted for use in a tyre according to any of the preceding claims.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0620417A GB2442811A (en) | 2006-10-14 | 2006-10-14 | Segmental tyre |
| GB0620417.6 | 2006-10-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008044035A1 true WO2008044035A1 (en) | 2008-04-17 |
Family
ID=37491526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/GB2007/003872 WO2008044035A1 (en) | 2006-10-14 | 2007-10-12 | Segmental tyre |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2442811A (en) |
| WO (1) | WO2008044035A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017083960A1 (en) * | 2015-11-17 | 2017-05-26 | 1434822 Alberta Ltd. | Tires with segmented tire bodies, embedded mounting elements and partially embedded cleats |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU168292U1 (en) * | 2016-02-24 | 2017-01-26 | Александр Васильевич Марунин | UNIVERSAL WHEEL |
| US11148468B1 (en) * | 2021-05-03 | 2021-10-19 | Abraham Ballena | Non-pneumatic tire with individual tire modules |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000118204A (en) * | 1998-10-19 | 2000-04-25 | Bridgestone Corp | Segment tire |
| JP2001113912A (en) * | 1999-10-21 | 2001-04-24 | Bridgestone Corp | Segment for vehicle |
| JP2001113916A (en) * | 1999-10-21 | 2001-04-24 | Bridgestone Corp | Wheel segment |
| JP2003002007A (en) * | 2001-06-26 | 2003-01-08 | Ohtsu Tire & Rubber Co Ltd :The | Solid tire wheel assembly |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5902017A (en) * | 1995-12-03 | 1999-05-11 | Bridgestone Corporation | Segment mounted on vehicle wheel or endless rubber track |
| JPH10272902A (en) * | 1997-01-31 | 1998-10-13 | Komatsu Ltd | Tire with lug segment |
| JPH11291709A (en) * | 1998-04-14 | 1999-10-26 | Bridgestone Corp | Rubber segment tire |
-
2006
- 2006-10-14 GB GB0620417A patent/GB2442811A/en not_active Withdrawn
-
2007
- 2007-10-12 WO PCT/GB2007/003872 patent/WO2008044035A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000118204A (en) * | 1998-10-19 | 2000-04-25 | Bridgestone Corp | Segment tire |
| JP2001113912A (en) * | 1999-10-21 | 2001-04-24 | Bridgestone Corp | Segment for vehicle |
| JP2001113916A (en) * | 1999-10-21 | 2001-04-24 | Bridgestone Corp | Wheel segment |
| JP2003002007A (en) * | 2001-06-26 | 2003-01-08 | Ohtsu Tire & Rubber Co Ltd :The | Solid tire wheel assembly |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017083960A1 (en) * | 2015-11-17 | 2017-05-26 | 1434822 Alberta Ltd. | Tires with segmented tire bodies, embedded mounting elements and partially embedded cleats |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2442811A (en) | 2008-04-16 |
| GB0620417D0 (en) | 2006-11-22 |
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