Tire for a mixed-use agricultural vehicle
AssigneeCompagnie Generale Des Etablissements Michelin
InventorOlivier Sejalon
Life of this patent
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Abstract
A tire for an agricultural vehicle, having a tread consisting of blocks in pairs separated by voids and arranged, over the width of the tread, in a median row, two intermediate rows and two lateral rows. To obtain compromise between rolling resistance and service life in terms of wear in road use, two consecutive blocks of the median row) are separated by a transverse void with a width (E1) at most 2.5 mm, the mean circumferential slenderness ratio of every block) of the median row is at least 0.95 and at most 1.15, every block of each intermediate row has a leading face) in the circumferential rolling direction tire which forms a mean angle (D2) equal at least to 30° with a radial direction (ZZ′) tire, and the mean circumferential slenderness ratio of every block in each lateral row is at most 0.9.
Claims18
A tire for an agricultural vehicle, comprising a tread with an axial width (L) and consisting of pairs of blocks separated by voids and arranged, over the width of the tread, in a median row, two intermediate rows and two lateral rows,
- the voids being either transverse voids which form an angle at least equal to 60° with a circumferential direction (XX′) of the tire, or circumferential voids which form an angle at most equal to 30° with the circumferential direction (XX′),
- the median row being centred on a median circumferential plane (E) of the tire, the two intermediate rows being positioned axially on either side of the median row and separated therefrom by circumferential voids, and the two lateral rows being positioned respectively axially outside an intermediate row and separated therefrom by a circumferential void,
- each median row, intermediate row and lateral row comprising a circumferential distribution of pairs of blocks separated by transverse voids and each having a mean radial height (H1, H2, H3), a mean circumferential length (B1, B2, B3) and a mean circumferential slenderness ratio defined as the ratio between the mean radial height and the mean circumferential length of the block,
- the blocks of a same lateral row extending axially towards the outside in the extension of the blocks of the adjacent intermediate row, such that any set of two blocks of the lateral row and intermediate row respectively, in the extension of one another, forms a lug,
- wherein two consecutive blocks in the median row are separated by a transverse void with a width (E1) equal at most to 2.5 mm, the mean circumferential slenderness ratio of any block in the median row is at least equal to 0.95 and at most equal to 1.15, and every block of each intermediate row comprises a leading face in the circumferential rolling direction of the tire which forms a mean angle (D2) equal at least to 30° with a radial direction (ZZ′) of the tire, and wherein the mean circumferential slenderness ratio of any block (33) in each lateral row (23) is at most equal to 0.9.
Dependencies are inferred from the claim text.