GB1588644A – Pneumatic tyres
– Google Patents
GB1588644A – Pneumatic tyres
– Google Patents
Pneumatic tyres
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Publication number
GB1588644A
GB1588644A
GB42534/77A
GB4253477A
GB1588644A
GB 1588644 A
GB1588644 A
GB 1588644A
GB 42534/77 A
GB42534/77 A
GB 42534/77A
GB 4253477 A
GB4253477 A
GB 4253477A
GB 1588644 A
GB1588644 A
GB 1588644A
Authority
GB
United Kingdom
Prior art keywords
tyre
tread
sidewalls
ridges
ribs
Prior art date
1976-10-12
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.)
Expired
Application number
GB42534/77A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pneumatiques Caoutchouc Manufacture et Plastiques Kleber Colombes SA
Original Assignee
Pneumatiques Caoutchouc Manufacture et Plastiques Kleber Colombes SA
Priority date (The priority date 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 date listed.)
1976-10-12
Filing date
1977-10-12
Publication date
1981-04-29
1977-10-12
Application filed by Pneumatiques Caoutchouc Manufacture et Plastiques Kleber Colombes SA
filed
Critical
Pneumatiques Caoutchouc Manufacture et Plastiques Kleber Colombes SA
1981-04-29
Publication of GB1588644A
publication
Critical
patent/GB1588644A/en
Status
Expired
legal-status
Critical
Current
Links
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Discuss
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
B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
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
B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
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
B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
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
B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
B60C11/03—Tread patterns
B60C11/0311—Patterns comprising tread lugs arranged parallel or oblique to the axis of rotation
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
B60C2200/00—Tyres specially adapted for particular applications
B60C2200/08—Tyres specially adapted for particular applications for agricultural vehicles
Description
(54) IMPROVEMENTS IN OR RELATING TO
PNEUMATIC TYRES
(71) We, PNEUMATIQUES CAOUTCHOUC
MANUFACTURE ET PLASTIQUES KLEBER
COLOMBES, a French Body Corporate, of Place de Valmy, 92 Colombes, France, do hereby
declare the invention, for which we pray that a
patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
The present invention relates to pneumatic
vehicle tyres which are intended to move over
unstable or slippery surfaces such as earth, mud
or snow and which for this reason have a tread
pattern which comprises bar-like ribs which are
spaced apart for penetration into soft ground so
as to provide a meshing action which increases
grip and enables the drive torque to be trans
mitted with the minimum of slip. The invention
relates more especially to pneumatic tyres
intended for fitting to the driving wheels of
agricultural tractors and similar vehicles.
One of the objects of the invention is in par
ticular to increase grip under the most difficult
working conditions when the tyres tend to sink
deeply into very soft ground.
Accordingly, the invention consists in a
pneumatic vehicle tyre intended to move over
loose or slippery ground, particularly for the
driving wheels of agricultural tractors or similar
vehicles, comprising a tyre body having bead
heels separated by an axial distance which,
when the tyre is mounted on its rim and infla
ted is approximately equal to the width of the
tread, and sidewalls which, under the same con
ditions, curve axially outwards connecting the
beads to the sides of the tread, said tread com
prising circumferentially spaced ribs which, in
the central region of the tread, extend alter
nately from that region to the two tread edges,
and each pair of ribs which are next adjacent in
said central region, substantially form a V,
wherein, on at least one side of the tyre, the
outer lateral parts of said ribs are extended in
continuous manner to the level of the corres
ponding bead by ridges which project from the
corresponding sidewall of the tyre so that their
lower ends bear on the bead-retaining flange of
the rim when the tyre is fitted thereto and in
flated.
In order that the invention may be more clearly understood, reference will now be made to the accompanying drawings which show three embodiments thereof by way of example, and in which:
Figs. 1 and 2 are cross-sectional and plan views of a first embodiment, and
Figs. 3 and 4 are cross-sectional views of two other embodiments.
Referring now to the drawings, the tyres shown have a body 1 having axially spaced beads 2, a crown 3 which carries a patterned tread 4, and sidewalls 5 which link the margins of the crown to the beads 2. The body 1 is reinforced by a carcass 6 formed by one or more layers or plies of textile or metal cords the edges of which are folded over around the wires 7 in the beads, 2. The carcass 6 may be of the cross or diagonal-ply type or of the radial type.
In the latter case, the crown of the tyre is confined by a reinforcing belt 8 which restricts the outside diameter of the tyre when inflated, this belt being positioned between the crown of the carcass 6 and the tread 4. The belt 8 is formed for example by two or more layers or plies of textile or metal cords which are orientated at small angles, of the order of 20 , to the equatorial plane to form with the radial carcass an annular band which is substantially inextensible in the circumferential direction. This conventional construction for the belt may be replaced by one of the many other known constructions. When the tyre is mounted on its rim 10, the axial spacing A of the beads between the edges of the rim is approximately equal to the width B of the tread in order to ensure that the tyre has good lateral stability. Generally speaking, the spacing A is less than or equal to the width B of the tread. When the tyre is inflated the sidewalls 5 are thus curved axially outwards with respect to the beads of the tyre when on its rim.
Because tyres according to the invention are intended for fitting to the driving wheels of agricultural tractors or other vehicles or machines which operate on similar terrain, the pattern of the tread 4 is a heavy one, formed in essence by high, thick transverse ribs 9 which are spaced apart circumferentially by a distance
D which is equal to at least twice their own thickness E and which is generally between 4 and 7 times the thickness E, the distance D being however less than the length of the contact area of the tyre on the ground under normal load. The ribs 9 in the central region of the tread extend alternatively from that region to the two tread edges, and each pair of ribs which are next adjacent in said central region, substantially form a V, as shown in Fig. 2.
In the tyres in question, the outer lateral parts 9a of the ribs 9 on the tread continue uninterruptedly into ridges 9b which extend for the entire height of the sidewalls 5 to the beads 2 so that their lower ends rest against the beadretaining flanges 10a of the rim carrying the tyre. In the embodiments illustrated, the ridges 9b lie in a broadly radial direction and they project from the curved outer faces of the sidewalls for an axial distance which may be of the order of 5 to 50 mm depending upon the size of the tyre. Preferably, the distance e for which the ridges project is not very much greater than their thickness E so that the ridges 9b will not flex under the strain of traction. These lateral ridges 9b form an additional pattern of vanelike members which are spaced apart by a distance equal to the spacing D between the ribs 9. This lateral pattern comes into action when the tyre sinks deeply into soft ground and it then provides extra grip which delays the outset of tyre slip under difficult working conditions. The effectiveness of the lateral ridges 9b is increased to its maximum by the fact that they extend for the entire height of the sidewalls up to the point where they come into contact with the edges of the rim and by reason of their heavy build similar to that of the ribs 9 of the tread from which they continue. They also have the effect of forming on the sidewalls 5 of the tyre pillars or buttresses which tend to reduce the inherent radial flexibility of the sidewalls. The sidewalls so reinforced flex less than those of a corresponding tyre with the result that the flexing of the tyre occurs more in the area of the crown. This increases the mobility of the ribs 9 of the main pattern at the exit from the area in contact with the ground and assists in the self-cleaning action of the tyre. The lateral ridges 9b also provide protection for the sidewalls 5 against cuts, when the tyre is used on broken and stony ground.
The tyre illustrated in Fig. 3 is generally similar to that shown in Figs. 1 and 2 except that the ribs 9 of the main tread pattern extend transversely, at the ends where their outer lateral parts 9a are situated, beyond a vertical plane tangent to the corresponding curved sidewall. The tyre being symmetrical, the result is that the width B of the tread pattern is greater than the maximum width G of the body of the tyre, which gives a wider tread area so that the grip of the tyre and its tractive ability are further enhanced.
In addition, the tyre has at the bottom of its sidewalls 5 a continuous circular fillet 14 to
which are connected the lower parts of the
lateral ridges 9b, which assists in giving the
lateral ridges stiffness in flexion. These fillets
14 have a lower face which is shaped to fit
round the corresponding edge 10a of the rim
in order to prevent earth and mud from getting
between the rim and the bead.
Fig. 4 illustrates another embodiment of the
invention in which the body 1 of the tyre has
sidewalls 5 which are distinctly shorter than
those of the tyres previously described, which
gives the body 1 of the tyre a low cross-section
in which the ratio of the cross-sectional height
H over the width G of the body of the tyre is
less than 0.6 and is preferably between 0.3 and
0.5. This tyre has a wide tread which promotes
grip and a low height which gives it good lateral
stability. As in the case of Fig. 1, the lateral
ridges 9b continue from the main spaced ribs
9 of the tread pattern to the bottom of the
sidewalls 5 so as to provide extra grip when the
tyre is moving while sunk into soft ground.
These lateral ridges 9b also assist in the self
cleaning action of the pattern.
As in the case of the tyre of Fig. 3, this tyre also may have a tread pattern which is widened sideways and whose transverse width B is greater than the width G of the body 1 in the
curved area of the sidewalls, as well as continuous circular fillets 14 which fit round the outer edges 10a of the rim 10 and to which the ridges 9b of the lateral pattern are connected.
Other embodiments may be deduced from the examples described and illustrated. In particular, the lateral ridges 9b may be provided on only one sidewall 5 of the tyre or may project to a greater extent on one of the sidewalls than on the other, in particular as dictated by the space available on the vehicle for the passage of the wheels.
WHAT WE CLAIM IS:
1. A pneumatic vehicle tyre intended to move over loose or slippery ground, particularly for the driving wheels of agricultural tractors or similar vehicles, comprising a tyre body having bead heels separated by an axial distance which, when the tyre is mounted on its rim and inflated is approximately equal to the width of the tread, and sidewalls which, under the same conditions, curve axially outwards connecting the beads to the sides of the tread, said tread comprising circumferentially spaced ribs which in the central region of the tread, extend alternately from that region to the two tread edges and each pair of ribs which are next adjacent in said central region, substantially form a V, wherein, on at least one side of the tyre, the outer lateral parts of said ribs are extended in continuous manner to the level of the corresponding bead by ridges which project from the corresponding sidewall of the tyre so that their lower ends bear on the bead-retaining flange of the rim when the tyre is fitted thereto and inflated.
2. A tyre as claimed in claim 1, wherein said
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (10)
**WARNING** start of CLMS field may overlap end of DESC **.
and 7 times the thickness E, the distance D being however less than the length of the contact area of the tyre on the ground under normal load. The ribs 9 in the central region of the tread extend alternatively from that region to the two tread edges, and each pair of ribs which are next adjacent in said central region, substantially form a V, as shown in Fig. 2.
In the tyres in question, the outer lateral parts 9a of the ribs 9 on the tread continue uninterruptedly into ridges 9b which extend for the entire height of the sidewalls 5 to the beads 2 so that their lower ends rest against the beadretaining flanges 10a of the rim carrying the tyre. In the embodiments illustrated, the ridges 9b lie in a broadly radial direction and they project from the curved outer faces of the sidewalls for an axial distance which may be of the order of 5 to 50 mm depending upon the size of the tyre. Preferably, the distance e for which the ridges project is not very much greater than their thickness E so that the ridges 9b will not flex under the strain of traction. These lateral ridges 9b form an additional pattern of vanelike members which are spaced apart by a distance equal to the spacing D between the ribs 9. This lateral pattern comes into action when the tyre sinks deeply into soft ground and it then provides extra grip which delays the outset of tyre slip under difficult working conditions. The effectiveness of the lateral ridges 9b is increased to its maximum by the fact that they extend for the entire height of the sidewalls up to the point where they come into contact with the edges of the rim and by reason of their heavy build similar to that of the ribs 9 of the tread from which they continue. They also have the effect of forming on the sidewalls 5 of the tyre pillars or buttresses which tend to reduce the inherent radial flexibility of the sidewalls. The sidewalls so reinforced flex less than those of a corresponding tyre with the result that the flexing of the tyre occurs more in the area of the crown. This increases the mobility of the ribs 9 of the main pattern at the exit from the area in contact with the ground and assists in the self-cleaning action of the tyre. The lateral ridges 9b also provide protection for the sidewalls 5 against cuts, when the tyre is used on broken and stony ground.
The tyre illustrated in Fig. 3 is generally similar to that shown in Figs. 1 and 2 except that the ribs 9 of the main tread pattern extend transversely, at the ends where their outer lateral parts 9a are situated, beyond a vertical plane tangent to the corresponding curved sidewall. The tyre being symmetrical, the result is that the width B of the tread pattern is greater than the maximum width G of the body of the tyre, which gives a wider tread area so that the grip of the tyre and its tractive ability are further enhanced.
In addition, the tyre has at the bottom of its sidewalls 5 a continuous circular fillet 14 to
which are connected the lower parts of the
lateral ridges 9b, which assists in giving the
lateral ridges stiffness in flexion. These fillets
14 have a lower face which is shaped to fit
round the corresponding edge 10a of the rim
in order to prevent earth and mud from getting
between the rim and the bead.
Fig. 4 illustrates another embodiment of the
invention in which the body 1 of the tyre has
sidewalls 5 which are distinctly shorter than
those of the tyres previously described, which
gives the body 1 of the tyre a low cross-section
in which the ratio of the cross-sectional height
H over the width G of the body of the tyre is
less than 0.6 and is preferably between 0.3 and
0.5. This tyre has a wide tread which promotes
grip and a low height which gives it good lateral
stability. As in the case of Fig. 1, the lateral
ridges 9b continue from the main spaced ribs
9 of the tread pattern to the bottom of the
sidewalls 5 so as to provide extra grip when the
tyre is moving while sunk into soft ground.
These lateral ridges 9b also assist in the self
cleaning action of the pattern.
As in the case of the tyre of Fig. 3, this tyre also may have a tread pattern which is widened sideways and whose transverse width B is greater than the width G of the body 1 in the
curved area of the sidewalls, as well as continuous circular fillets 14 which fit round the outer edges 10a of the rim 10 and to which the ridges 9b of the lateral pattern are connected.
Other embodiments may be deduced from the examples described and illustrated. In particular, the lateral ridges 9b may be provided on only one sidewall 5 of the tyre or may project to a greater extent on one of the sidewalls than on the other, in particular as dictated by the space available on the vehicle for the passage of the wheels.
WHAT WE CLAIM IS:
1. A pneumatic vehicle tyre intended to move over loose or slippery ground, particularly for the driving wheels of agricultural tractors or similar vehicles, comprising a tyre body having bead heels separated by an axial distance which, when the tyre is mounted on its rim and inflated is approximately equal to the width of the tread, and sidewalls which, under the same conditions, curve axially outwards connecting the beads to the sides of the tread, said tread comprising circumferentially spaced ribs which in the central region of the tread, extend alternately from that region to the two tread edges and each pair of ribs which are next adjacent in said central region, substantially form a V, wherein, on at least one side of the tyre, the outer lateral parts of said ribs are extended in continuous manner to the level of the corresponding bead by ridges which project from the corresponding sidewall of the tyre so that their lower ends bear on the bead-retaining flange of the rim when the tyre is fitted thereto and inflated.
2. A tyre as claimed in claim 1, wherein said
projecting ridges have a generally radial dfrec- tion.
3. A pneumatic tyre as claimed in claim 1 or 2, in which the ribs of the tread pattern are spaced apart circumferentially by at least twice their thickness.
4. A pneumatic tyre as claimed in claim 1 or 2, wherein on at least one side of the tyre the outer lateral parts of said ribs extend beyond a vertical plane tangent to the corresponding curved side wall.
5. A pneumatic tyre as claimed in any of the preceding claims, wherein the lower parts of said lateral ridges are consituted by a continuous circumferential fillet which interconnects said lower parts and fits round the corresponding bead-retaining flange of the rim.
6. A pneumatic tyre as claimed in any of the preceding claims, and having short sidewalls which give the body of the tyre a low crosssection in which the ratio of height over width is less than 0.6.
7. A pneumatic tyre as claimed in claim 6, wherein said ratio is between 0.3 and 0.5.
8. A pneumatic tyre substantially as hereinbefore described with reference to Figs. 1 and 2 of the accompanying drawings.
9. A pneumatic tyre substantially as hereinbefore described with reference to Fig. 3 of the accompanying drawings.
10. A pneumatic tyre substantially as hereinbefore described with reference to Fig. 4 of the accompanying drawings.
GB42534/77A
1976-10-12
1977-10-12
Pneumatic tyres
Expired
GB1588644A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
FR7630854A
FR2367627A1
(en)
1976-10-12
1976-10-12
TIRE FOR DRIVE WHEELS OF AGRICULTURAL TRACTORS OR SIMILAR MACHINERY
Publications (1)
Publication Number
Publication Date
GB1588644A
true
GB1588644A
(en)
1981-04-29
Family
ID=9178742
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB42534/77A
Expired
GB1588644A
(en)
1976-10-12
1977-10-12
Pneumatic tyres
Country Status (8)
Country
Link
AT
(1)
AT354872B
(en)
BE
(1)
BE859646A
(en)
DE
(1)
DE2744848A1
(en)
FR
(1)
FR2367627A1
(en)
GB
(1)
GB1588644A
(en)
IT
(1)
IT1091436B
(en)
LU
(1)
LU78281A1
(en)
NL
(1)
NL7711029A
(en)
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
WO2001017801A1
(en)
*
1999-09-03
2001-03-15
The Goodyear Tire & Rubber Company
Farm implement tire
JP2015227137A
(en)
*
2014-06-02
2015-12-17
株式会社ブリヂストン
Agricultural tire
Families Citing this family (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2511952A1
(en)
*
1981-08-31
1983-03-04
Kleber Colombes
TIRE FOR AN AGRICULTURAL TRACTOR DRIVE WHEEL OR SIMILAR VEHICLE
US4383567A
(en)
*
1982-02-05
1983-05-17
The Goodyear Tire & Rubber Company
Pneumatic tractor tire
AT400131B
(en)
*
1991-12-20
1995-10-25
Lim Kunststoff Tech Gmbh
Vehicle wheel
US6761198B2
(en)
1999-03-02
2004-07-13
The Goodyear Tire & Rubber Company
Pneumatic tire having lug and groove configuration extending from tread over at least 30% of sidewall
Family Cites Families (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR694513A
(en)
*
1930-04-25
1930-12-04
Improvements to cellular compartmentalized rubber tires for vehicle wheels and molds to make them
US2113527A
(en)
*
1937-12-28
1938-04-05
Firestone Tire & Rubber Co
Tire construction
US2874745A
(en)
*
1954-01-04
1959-02-24
Firestone Tire & Rubber Co
Tubeless tire
DE1909105A1
(en)
*
1969-02-03
1970-08-13
Fuerstenwalde Reifen Veb K
Pneumatic tire with changeable cross-section and drive to accommodate this pneumatic tire
1976
1976-10-12
FR
FR7630854A
patent/FR2367627A1/en
active
Granted
1977
1977-10-05
DE
DE19772744848
patent/DE2744848A1/en
active
Granted
1977-10-07
NL
NL7711029A
patent/NL7711029A/en
not_active
Application Discontinuation
1977-10-10
LU
LU78281A
patent/LU78281A1/xx
unknown
1977-10-11
AT
AT726377A
patent/AT354872B/en
not_active
IP Right Cessation
1977-10-12
GB
GB42534/77A
patent/GB1588644A/en
not_active
Expired
1977-10-12
BE
BE181676A
patent/BE859646A/en
not_active
IP Right Cessation
1977-10-12
IT
IT69271/77A
patent/IT1091436B/en
active
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
WO2001017801A1
(en)
*
1999-09-03
2001-03-15
The Goodyear Tire & Rubber Company
Farm implement tire
JP2015227137A
(en)
*
2014-06-02
2015-12-17
株式会社ブリヂストン
Agricultural tire
EP3150405A4
(en)
*
2014-06-02
2017-07-05
Bridgestone Corporation
Agriculture tire
Also Published As
Publication number
Publication date
FR2367627A1
(en)
1978-05-12
BE859646A
(en)
1978-04-12
IT1091436B
(en)
1985-07-06
DE2744848A1
(en)
1978-04-13
FR2367627B1
(en)
1979-02-23
LU78281A1
(en)
1978-06-09
NL7711029A
(en)
1978-04-14
ATA726377A
(en)
1979-06-15
DE2744848C2
(en)
1988-05-11
AT354872B
(en)
1979-02-11
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Legal Events
Date
Code
Title
Description
1981-08-19
PS
Patent sealed
1997-06-04
PCNP
Patent ceased through non-payment of renewal fee
Effective date:
19961012
