# US 6,719,279 B1 · Air spring sleeve > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,719,279 B1 - Document ID: US6719279B1 - Status: Granted - Kind: B1 - Application number: 10/225,806 - Filed: 2002-08-21 - Granted: 2004-04-13 - Earliest claimed: 2002-08-21 - Assignees: BFS Diversified Products, LLC - Inventors: Russell W. Koch; John D. Rensel - Web page: https://patentgrep.com/patent/US6719279B1 ## CPC - F16F 9/05: the flexible wall being of the rolling diaphragm type - F16F 9/0409: {characterised by the wall structure} - F16F 9/0463: {with separate crimping rings} - B60G 2206/424: Plunger or top retainer construction for bellows or rolling lobe type air springs - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION - B60G: VEHICLE SUSPENSION ARRANGEMENTS (air-cushion vehicles B60V; {cycle suspensions B62K25/00}) ## Abstract A flexible sleeve for an air spring terminates in end portions which define a pair of open ends. The sleeve has inner and outer layers of a flexible material with a plurality of reinforcement elements disposed within the materials with the reinforcement elements extending throughout the end portions. Inner and outer layers of the end portions are joined to the inner and outer layers of the sleeve, by non-overlapping joints with the inner and outer layers of the end portions having a higher modulus of elasticity than the inner and outer layers of the sleeve. ## Claims ### Claim 1 An air spring sleeve comprising: an elongated flexible tubular member terminating in axially spaced first and second ends and having inner and outer layers of a flexible material and containing reinforcement elements disposed therebetween and extending throughout the length of said tubular member; and at least one of said inner and outer layers of said first end terminating in a modified end portion formed of a non-reinforced elastomeric material having a higher modulus of elasticity than said one inner and outer layer of the tubular member, and being joined to said one layer by a non-overlapping joint providing said tubular member with a uniform thickness throughout its axial length. ### Claim 2 (depends on 1) The air spring sleeve defined in claim 1 wherein both of the inner and outer layers of the tubular member terminate in a modified end portion, each having at least one layer terminating in an end portion having a higher modulus of elasticity than said inner and outer layers. ### Claim 3 (depends on 1) The air spring sleeve defined in claim 1 wherein both of the inner and outer layers at both the first and second ends terminate in modified end portions wherein both layers terminate in end portions having a higher modulus of elasticity than said inner and outer layers. ### Claim 4 (depends on 1) The air spring sleeve defined in claim 1 wherein the modified end portion of said one of the inner and outer layers of the first open end has a Shore A hardness of between 60 and 100. ### Claim 5 (depends on 4) The air spring sleeve defined in claim 4 wherein the modified end portion of said one of the inner and outer layers of the first open end has a Shore A hardness of between 60 and 80. ### Claim 6 (depends on 1) The air spring sleeve defined in claim 1 wherein the inner and outer layers of the tubular member have the same thickness and hardness throughout their axial lengths. ### Claim 7 (depends on 1) The air spring sleeve defined in claim 1 wherein each of the inner and outer layers of the tubular member has a Shore A hardness in the general range of 45 and 65. ### Claim 8 (depends on 1) The air spring sleeve defined in claim 1 wherein the modified end portion has an axial length in the range of 10 mm and 50 mm. ### Claim 9 (depends on 1) The air spring sleeve defined in claim 1 wherein the non-overlapping joint formed between the said one of the inner and outer layers of the tubular member and the modified end portion is a butt joint. ### Claim 10 (depends on 1) The air spring sleeve defined in claim 1 wherein the non-overlapping joint formed between the said one of the inner and outer layers of the tubular member and the modified end portion is a bevel joint. ### Claim 11 (depends on 1) The air spring sleeve defined in claim 1 wherein the said one layer of the first end which is joined to the modified end portion having the higher modulus of elasticity is the inner layer. ### Claim 12 (depends on 1) The air spring sleeve defined in claim 1 wherein the said one layer of the first end which is joined to the modified end portion having the higher modulus of elasticity is the outer layer. ### Claim 13 (depends on 1) The air spring sleeve defined in claim 1 wherein the flexible tubular member is formed of an elastomeric material. ### Claim 14 (depends on 1) The air spring sleeve defined in claim 1 wherein the flexible tubular member is formed of a thermoplastic material. ### Claim 15 (depends on 1) The air spring sleeve defined in claim 1 wherein the flexible tubular member is formed of rubber. ### Claim 16 An air spring having first and second end members and a flexible sleeve connected to said end members and forming an internal pressure chamber, said sleeve being formed with at least one open end; a ring sealingly securing said open end of the flexible sleeve to a sealing surface of the first end member; said sleeve having inner and outer layers of flexible materials and reinforcement elements disposed therein; and at least one of said inner and outer layers at the open end terminating in a modified end portion having a higher modulus of elasticity than said inner and outer layers of the sleeve and being joined to said one of the inner and outer layers by a non-overlapping joint, said modified end portion extending throughout the length of the sealing surface of said first end member. ### Claim 17 (depends on 16) The air spring defined in claim 16 wherein both of the inner and outer layers terminate in modified end portions; in which each end portion has a higher modulus of elasticity than said inner and outer layers of the sleeve and is joined to said layers by non-overlapping joints; and in which the sleeve terminates in a pair of opposed open ends. ### Claim 18 (depends on 16) The air spring defined in claim 16 wherein the modified end portion of the sleeve has a hardness in the general range of 60 to 80 on the Shore A scale. ### Claim 19 (depends on 16) The air spring defined in claim 16 wherein the inner and outer layers of the sleeve have a Shore A hardness within the general range of 45 and 65. ### Claim 20 (depends on 16) The air spring defined in claim 16 wherein the open end of the sleeve is sealingly secured to a sealing surface of the first end member by a swage ring. ### Claim 21 (depends on 16) The air spring defined in claim 16 wherein the modified end portion has a length of between 10 mm and 50 mm. ### Claim 22 (depends on 16) The air spring defined in claim 16 wherein a pair of reinforcing plies are sandwiched between the inner and outer layers of the sleeve and contain reinforcing cords.