Classifications

• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
  • B60B21/00—Rims
  • B60B21/02—Rims characterised by transverse section
  • B60B21/023—Rims characterised by transverse section the transverse section being non-symmetrical
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
  • B60B21/00—Rims
  • B60B21/02—Rims characterised by transverse section
  • B60B21/026—Rims characterised by transverse section the shape of rim well
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
  • B60B21/00—Rims
  • B60B21/02—Rims characterised by transverse section
  • B60B21/028—Rims characterised by transverse section the shape of hump
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
  • B60B21/00—Rims
  • B60B21/02—Rims characterised by transverse section
  • B60B21/04—Rims characterised by transverse section with substantially radial flanges
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
  • B60B21/00—Rims
  • B60B21/10—Rims characterised by the form of tyre-seat or flange, e.g. corrugated
  • B60B21/102—Rims characterised by the form of tyre-seat or flange, e.g. corrugated the shape of bead seats
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
  • B60B21/00—Rims
  • B60B21/10—Rims characterised by the form of tyre-seat or flange, e.g. corrugated
  • B60B21/104—Rims characterised by the form of tyre-seat or flange, e.g. corrugated the shape of flanges

Definitions

• Vehicle jantc for mounting a tire and a support support
• the present invention relates to a vehicle rim for mounting a tire, so-called inverted seats.
• an assembly comprising a wheel, a tire mounted on the wheel and, optionally, a tread support support is designated “assembled assembly”.
• the wheel comprises a rim, for example such as that described in WO 01/08905, and a disc.
• the beads of the tire are supported on seats of the rim.
• the average diameters of the two seats are different to facilitate the assembly and disassembly of the support support on the rim.
• the seat closest to the inside of the vehicle has the largest average diameter.
• the support support is worn circumferentially by a bearing surface of the rim, located between the two seats. It is constituted for example by an elastically deformable elastomeric material, which prevents the tread from sagging when the mounted assembly rolls in degraded mode, that is to say when the pressure prevailing in the tire is insufficient. or none.
• the rim described in WO 01/08905 is provided with a boss safety axially extending the seat towards the inside of the rim. It is said that the safety boss has an anti-decoupling function.
• the inventors of the present invention have had the idea to perform tests even more restrictive for all mounted worn word forward train, subjecting it to a test run in degraded mode during a braking d urgency supported, the front wheels steered.
• the invention relates to a vehicle rim, of revolution, for mounting a tire, having a first seat to be arranged on the side vehicle interior and a second seat, the first seat being extended axially towards the second seat, by a safety boss and comprising:
• This rim is characterized in that, on the side of the boss, the inner edge of the first seat tangent a cone of revolution coaxial with the rim and open to the second seat, with an apex angle greater than 103 °.
• the edge of the first seat, oriented on the side of the boss, is sufficiently inclined to provide a barrier which prevents the release of the bead bearing on the first seat.
• the inventors have indeed found that the rim is particularly robust anti-decoupling when the first seat has this characteristic.
• the first seat has a mean diameter smaller than the average diameter of the second seat.
• it is the seat disposed on the outside of the vehicle and closest to the disc of the wheel which has the largest diameter.
• the first seat has an average diameter greater than the average diameter of the second seat.
• it is the seat of smaller average diameter which is disposed on the outside of the vehicle and closest to the disk of the wheel.
• the lower middle diameter seat is extended axially towards the upper middle diameter seat by a bearing surface. tread support. It is this embodiment which is illustrated in the accompanying figures. However, the particular geometry according to the invention of the seat disposed on the inside of the vehicle also applies in the case of a mounted assembly without support and whatever the diameters and respective positions of the seats of the rim.
• the inner edge of the first seat coincides locally with a torus coaxial with the rim, the torus being radially external to the first seat.
• the radius of curvature of the generating circular arc of the inner edge of the first seat is between 5 mm and 6 mm.
• the first seat comprises an outer edge extending the bottom of the first seat opposite the inner edge.
• the outer edge of the first seat coincides locally with a torus coaxial with the rim, the torus being radially external to the first seat.
• the rim is such that:
• the outer edge of the first seat is shaped so that the cone coincides with the bottom of the first seat intersects the torus coincides with the outer edge of the first seat in two circles of intersection,
• - L t is the length of the convex hull of the intersection of the first seat with the plane perpendicular to the rim axis, axially offset towards the second seat by 6 mm from the nearest intersection circle the outer edge of the first seat,
• the first seat and the boss define first and second profiles symmetrical with respect to the axis of the rim
• a point of connection between the bottom and the inner edge on the first profile, and a current point on the second profile make it possible to define a second plane normal to the foreground and containing the connection point and the current point,
• L p is the maximum length of the convex hull of the intersection of the rim with the second plane, when the current point describes the second profile, and such that:
• An axial plane is defined as a plane containing the axis of revolution of the rim.
• the inventors have manufactured several prototypes of rims. Each rim was subjected to anti-decoupling tests and tire assembly and disassembly tests.
• L t ⁇ 1500 mm Preferably for a wheel diameter of less than 460 mm, for: L t ⁇ 1500 mm we have: - ⁇ - ⁇ 102.1%.
• the safety boss comprises a frustoconical portion locally confused with a cone of revolution open to the first seat and coaxial with the rim.
• the safety boss comprises a cylindrical portion locally confused with a cylinder of revolution coaxial with the rim, and extending the frustoconical portion of the boss to the first seat.
• FIG. 1 is a view in axial section of a mounted assembly comprising a rim according to the invention
• FIG. 2 is a detailed view in axial section of the rim shown in FIG. 1,
• FIG. 3 is a detailed view of the seat of larger diameter of the rim shown in FIG. 2;
• FIG. 4 is a view of a variant of the seat shown in FIG. 3, and
• FIG. 5 is a view of the seat of larger diameter of the rim shown in Figure 2.
• FIG. 1 shows, in an axial plane P 1 , a mounted assembly designated by the general reference 10.
• the assembled assembly is substantially of revolution and comprises a wheel 12, a tire 14 and a support 16 of tread support.
• the tire 12 conventionally comprises a tread 18 joined, by means of two sidewalls 20, to two beads 22. It is reinforced by a radial carcass reinforcement formed of a sheet (not shown) of usually textile cables ( other types or types of reinforcement are also possible) anchored in each bead 22 around a rod 24.
• the wheel 12 comprises a rim 26 shown in more detail in Figure 2.
• the rim 26, sectional view in the plane P 1 has two symmetrical profiles relative to the axis of the mounted assembly. Only one of the two profiles is shown in Figure 2.
• the rim 26 includes a bearing surface 28 for supporting the support support 16.
• the rim 26 also comprises first 30 and second 32 seats on which the beads 22 are supported.
• the first seat 30 has a mean diameter greater than the average diameter of the second seat 32. When the wheel 12 is mounted on a vehicle, the first seat 30 is oriented towards the vehicle.
• the first seat 30, shown in more detail in Figure 3 comprises a bottom 34, an inner edge 36 extending the bottom 34 to the second seat 32, and an outer edge 38 extending the bottom 34 opposite the inner edge 36.
• the inner edge 36 is extended towards the second seat 32 by a safety boss 40, and the outer edge 38 is extended opposite the bottom 34 by a projection 42.
• the safety boss 40 is extended towards the second seat 32 by a mounting groove 43.
• the outer edge 38 is locally confused with a torus 44 coaxial with the rim.
• the generating circle of the torus 44 has a radius substantially equal to 12 mm.
• the bottom 34 is locally confused with a cone of revolution 46 open to the second seat 32, coaxial with the rim 26 and at the apex angle ⁇ substantially equal to 30 ° We speak then frustoconical bottom 34.
• the inner edge 36 coincides locally with a cone of revolution 48 open towards the second seat 32, coaxial with the rim 26 and with an apex angle ⁇ substantially equal to 115 °.
• the inner edge 36 is locally confused with a torus 50 coaxial with the rim 26, the generating circle of the torus 50 having a radius substantially equal to 5.5 mm.
• the inner edge is adjacent to the boss 40.
• the inner edge is tangent to the cone 48 with an apex angle greater than 110 °, here about 115 °, at the point of inflection between the inner edge and the first edge. part of the boss 40, also circular but inverted curvature.
• the inner edge 36 tangents the cone 48.
• the safety boss 40 comprises a frustoconical portion 52 coincident locally with a cone of revolution 54 open to the first seat 30, coaxial with the rim 26 and the apex angle ⁇ substantially equal to 150 °.
• the safety boss 40 further comprises a cylindrical portion 56 locally confused with a cylinder of revolution 58 coaxial with the rim 26 and extending the portion frustoconical 52 of the boss towards the inner edge 36 of the first seat 30.
• the cone 46 intersects the core 44 in two circles of intersection C 1 and C 2 , the circle C 1 being closest to the outer edge of the first seat 30.
• the length L t is then equal to the length of the convex envelope 60 of the intersection of the first seat 30 with the plane P 2 . If the first seat is perfectly revolution, this intersection is a circle and the length L t is equal to the perimeter of this circle.
• the value of d is chosen arbitrarily so as to obtain a reference length L t , substantially equal to the perimeter of the first seat and the inside perimeter of the bead 22 of the tire 14.
• Figure 5 a sectional view in the plane P 1 of the first seat 30, on which the two symmetrical profiles are shown.
• the index a is used to describe the elements of the upper profile and the index b to describe the elements of the lower profile.
• Xa is the connection point between the bottom 34a and the inner edge 36a.
• Xb is a current point on the first seat 30b and the safety boss 40b.
• the length L p is equal to the maximum length of the convex envelope 62 of the intersection of the rim 26 with the plane P 3 , when the point Xb describes the first seat 30b and the safety boss 40b.
• the value L p substantially corresponds to the value that the inner perimeter of the bead 22 of the tire 14 must pass during a disassembly operation or during a detachment.
• the ratio between the two lengths Z ⁇ and L t defined above must be such that, on the one hand, the anti-decoupling function is correctly provided by the safety boss 40 and on the other hand , the mounting and dismounting of the tire 14 on the wheel 12 remains possible using conventional garage tools.
• the disassembly of the bead of the tire disposed on the first seat 30 is effected by a progressive thrust of a roller against this bead axially towards the mounting groove, the assembled assembly being rotated slowly. This push locally moves the bead and makes it progressively cross the inner edge of the seat and the safety boss. The bead then falls into the throat of
• the assembly It is this operation for which the report - is determining.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Tires In General (AREA)

Applications Claiming Priority (3)

Publications (1)

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Family Applications (1)

Country Status (4)

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Family Cites Families (11)

• 2005
  • 2005-06-27 US US11/631,814 patent/US20080210357A1/en not_active Abandoned
  • 2005-06-27 EP EP05756839A patent/EP1768859A1/de not_active Withdrawn
  • 2005-06-27 WO PCT/EP2005/052990 patent/WO2006010681A1/fr active Application Filing
  • 2005-06-27 JP JP2007519770A patent/JP2008505794A/ja not_active Abandoned

Non-Patent Citations (1)

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