{
  "$type": "site.standard.document",
  "description": "Provided is a pneumatic tyre tread which reduces tread pattern noise while effectively suppressing air column resonance produced by circumferential grooves. The pneumatic tyre tread according to the present invention is provided with circumferential grooves 2, an intermediate rib 3, and shoulder…",
  "path": "/patents/996509",
  "publishedAt": "2012-10-31T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60C11/0309",
    "MICHELIN & CIE [FR]"
  ],
  "textContent": "Provided is a pneumatic tyre tread which reduces tread pattern noise while effectively suppressing air column resonance produced by circumferential grooves. The pneumatic tyre tread according to the present invention is provided with circumferential grooves 2, an intermediate rib 3, and shoulder ribs 4 in the contact surface; the tread is also provided with a plurality of resonators 5 which have a branch groove shape in which one end opens into a circumferential groove and the other end terminates in the intermediate rib, and which reduce the air column resonance in the circumferential grooves; the length of the branch grooves 5 is at least 40% of the length of the contact surface, the groove width is between 10% and 25% of the circumferential groove width, and the projected length in the lateral direction of the branch grooves is at least 95% of the pitch length, when the tyre is mounted on a standard rim and inflated to the nominal inflation pressure, and the nominal load is applied; and the difference between the minimum cross-sectional void ratio in the intermediate rib where the branch grooves are provided and the maximum cross-sectional void ratio in said intermediate rib is no greater than 10%.",
  "title": "PNEUMATIC TIRE TREAD"
}