Pneumatic suspension system

A pneumatic suspension system comprising:

• a rotatable air spring assembly including a canister having a top with an opening through the top and the air spring including a diaphragm forming a chamber with the canister the chamber being chargeable with a gas charge;
• a bolt extending through the opening in the top of the canister;
• a nut capturing the bolt in position relative to the canister so that both the bolt and the nut are rotatable in concert with the air spring about a common axis;
• a seal ring captured between the bolt and the canister the seal ring remaining stationary in a rotational sense relative to the rotatable air spring wherein the seal ring includes an air passage through which the gas charge is effected in the air spring.

A pneumatic suspension system mountable to a vehicle's structure comprising:

• an air spring assembly including an air canister having a top with an opening through the top;
• a diaphragm forming a chamber with the canister;
• a bolt extending through the opening in the top of the canister having an axial bore and a radial bore intersecting the axial bore;
• a seal ring captured between the canister top and the bolt having a radial opening communicating with the radial bore of the bolt wherein the air spring, bolt and mount are rotatable in concert relative to the seal ring and wherein a continuously open charging route is maintained through the seal ring and bolt to the chamber wherein the seal ring includes a bottom surface with a groove in the bottom surface;
• and
• a bumper carried in the groove.