Tread block arrangement having a sipe, and a lamella plate
AssigneeNokian Renkaat Oyj
InventorsJorma TIKKA, Mikko JOKINEN, Tomi KORKAMA
Life of this patent
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Abstract
A tread block arrangement suitable for a tyre or for a tread band for a tyre, the tread block arrangement comprising a having a first sipe. A bottom of the first sipe is provided with at least a first recess and a second recess, the first recess and the second recess intruding the tread block from the bottom line away from a top opening of the first sipe. The first and second recesses are comprised by first and second sipe expansions, respectively. The sipe expansions extend towards the top opening of the first sipe and locally widen the first sipe. A lamella plate for producing the first sipe.
Claims17
A tread block arrangement suitable for a tyre or for a tread band for a tyre, the tread block arrangement comprising:
- a tread block comprising a first sipe wall, a second sipe wall, and a bottom delimiting a first sipe, wherein
- the first sipe comprises a top opening,
- the top opening of the first sipe has a zig-zag or an undulating pattern,
- the first sipe wall and the second sipe wall are arranged parallel to each other and define a primary width of the first sipe, the primary width of the first sipe being a width of the top opening,
- the bottom defines a bottom line of the first sipe, wherein a primary depth of the first sipe is arranged between the top opening and the bottom line,
- the bottom of the first sipe is provided with at least a first recess and a second recess, the first recess and the second recess intruding the tread block from the bottom line away from the top opening,
- the first recess is comprised by a first sipe expansion, the first sipe expansion extending towards the top opening of the first sipe and having a secondary first width as measured between the first sipe wall and the second sipe wall at a location between the bottom line and the top opening, the secondary first width exceeding the primary width,
- the second recess is comprised by a second sipe expansion, the second sipe expansion extending towards the top opening of the first sipe and having a secondary second width as measured between the first sipe wall and the second sipe wall at a location between the bottom line and the top opening, the secondary second width exceeding the primary width,
- a top surface of the first sipe expansion is inclined in such a way that a first normal of the top surface of the first sipe expansion forms a first angle of 20 to 70 degrees with a first direction that is directed from the top opening to the bottom of the first sipe, and
- a top surface of the second sipe expansion is inclined in such a way that a second normal of the top surface of the second sipe expansion forms a second angle of 20 to 70 degrees with the first direction.
A lamella plate for forming a first sipe to a tread block of a tread block arrangement suitable for a tyre or for a tread band for a tyre, the lamella plate comprising:
- a first surface for forming a first sipe wall of the first sipe,
- a second surface opposite to the first surface for forming a second sipe wall of the first sipe,
- a bottom edge for forming a bottom of the first sipe, and
- a top edge opposite the bottom edge, wherein
- a distance between the first surface and the second surface defines a primary thickness of the lamella plate, and
- the lamella plate is configured to form a first sipe of which top opening has a zig-zag or an undulating pattern,
- the bottom edge is provided with a first bulge and a second bulge, the first bulge and the second bulge protruding from a bottom line defined by the bottom edge away from the top edge,
- the first bulge is comprised by a first expanded section of the lamella plate, the first expanded section extending towards the top edge and having a secondary first thickness as measured at a location between the bottom line and the top edge, the secondary first thickness exceeding the primary thickness of the lamella plate,
- the second bulge is comprised by a second expanded section of the lamella plate, the second expanded section extending towards the top edge and having a secondary second thickness as measured at a location between the bottom line and the top edge, the secondary second thickness exceeding the primary thickness of the lamella plate,
- a top surface of the first expanded section is inclined in such a way that a third normal of the top surface of the first expanded section forms a third angle with a second direction that is directed from the bottom edge to the top edge, the third angle being 20 to 70 degrees, and
- a top surface of the second expanded section is inclined in such a way that a fourth normal of the top surface of the second expanded section forms a fourth angle with the second direction, the fourth angle being 20 to 70 degrees.
Dependencies are inferred from the claim text.