Rolling Assembly
Adapter for a rolling assembly comprising a tire, and a rim having two rim seats and two rim flanges. The adapter has an axially inner end mounted on the rim seat and comprises an inner reinforcing element, an axially outer end that comprises an outer reinforcing element, a body that connects the two ends to form a single piece. A substantially cylindrical adapter seat is configured to receive a bead, and is situated at the axially outer end of the body. An adapter bearing face is substantially contained in a plane perpendicular to the rotation axis, and situated on the axially inner face of the axially outer end. The reinforcing element of the axially outer end is entirely situated axially outside the bearing face. The body comprises, opposite the adapter seat, an annular seat reinforcer. The inner wall of the tire is covered by a layer of a self-sealing composition.
1 . Rolling mounted assembly having a rotation axis and comprising:
a tire having two beads and an inner wall;
at least one adapter;
a rim;
said adapter providing the connection between one of the beads and the rim,
said rim having two rim seats and two rim flanges;
said adapter having:
an axially inner end that is intended to be mounted on the rim seat and comprises an inner reinforcing element,
an axially outer end that comprises an outer reinforcing element,
a body that connects said outer end to said inner end so as to form a single piece and comprises at least one main reinforcement that provides the connection between said outer reinforcer and said inner reinforcer,
a substantially cylindrical adapter seat intended to receive one of said beads, said seat being situated at the axially outer end of said body,
an adapter bearing face substantially contained in a plane perpendicular to the rotation axis, said bearing face being situated on the axially inner face of the axially outer end,
wherein the inner wall of the tire is partially or completely covered by at least one layer of a self-sealing composition.
2 . The assembly according to claim 1 , wherein the self-sealing composition has a Shore 00 hardness of less than or equal to 10.
3 . The assembly according to claim 1 , wherein the self-sealing composition is selected from a composition based on a thermoplastic stirene (TPS) elastomer, or from a composition comprising at least one unsaturated diene elastomer, or from terpene polybutene resins and as main component, or from silicone-based, urethane-based, stirene-based or else ethylene-based compounds, or from a composition based on a butyl elastomer.
4 . The assembly according to claim 3 , wherein the composition based on a thermoplastic stirene (TPS) elastomer comprises more than 200 phr of an extender oil for extending said elastomer.
5 . The assembly according to claim 3 , wherein the composition comprising at least one unsaturated diene elastomer comprises between 30 and 90 phr of a hydrocarbon resin, a liquid plasticizer, the glass transition temperature (Tg) of which is below −20° C., at a weight content of between 0 and 60 phr and from 0 to 120 phr of a filler.
6 . The assembly according to claim 3 , wherein the composition based on a butyl elastomer comprises a non-halogenated butyl elastomer.
7 . The assembly according to claim 3 , wherein the composition based on a butyl elastomer comprises between 5 and 40 phr of an extender oil selected from polyisobutylene, between 5 and 55 phr of a tackifying resin, and a non-reinforcing filler.
8 . The assembly according to claim 7 , wherein the polyisobutylene has a molecular weight of less than or equal to 10 000.
9 . The assembly according to claim 7 , wherein the non-reinforcing filler is selected from chalk or kaolin.
10 . The assembly according to claim 1 , wherein the reinforcing element of the axially outer end is positioned radially on the outside of the adapter seat.
11 . The assembly according to claim 3 , wherein the TPS is the predominant elastomer of the self-sealing layer.
12 . The assembly according to claim 3 , wherein the TPS elastomer is selected from the group consisting of stirene/butadiene/stirene (SBS), stirene/isoprene/stirene (SIS), stirene/isoprene/butadiene/stirene (SIBS), stirene/ethylene/butylene/stirene (SEBS), stirene/ethylene/propylene/stirene (SEPS), stirene/ethylene/ethylene/propylene/stirene (SEEPS) block copolymers and mixtures of these copolymers.
13 . The assembly according to claim 3 , wherein the TPS elastomer is selected from the group consisting of SEBS copolymers, SEPS copolymers and mixtures of these copolymers.
14 . The assembly according to claim 3 , wherein the unsaturated diene elastomer is selected from the group consisting of polybutadienes, natural rubber, synthetic polyisoprenes, butadiene copolymers, isoprene copolymers and mixtures of such elastomers.
15 . The assembly according to claim 3 , wherein the unsaturated diene elastomer is an isoprene elastomer, preferably selected from the group consisting of natural rubber, synthetic polyisoprenes and mixtures of such elastomers the unsaturated diene elastomer is an isoprene elastomer, preferably selected from the group consisting of natural rubber, synthetic polyisoprenes and mixtures of such elastomers.
16 . The assembly according to claim 3 , wherein the unsaturated diene elastomer is a blend of at least two solid elastomers, a polybutadiene or butadiene copolymer elastomer, referred to as “elastomer A”, and a natural rubber or synthetic polyisoprene elastomer, referred to as “elastomer B”, the elastomer A:elastomer B weight ratio being within a range from 10:90 to 90:10.
17 . The assembly according to claim 16 , wherein the elastomer A:elastomer B weight ratio is within a range from 20:80 to 80:20.
18 . The assembly according to claim 7 , wherein the polyisobutylene has a molecular weight of less than or equal to 5000.
19 . The assembly according to claim 16 , wherein the elastomer A:elastomer B weight ratio is within a range from 30:70 to 70:30.