Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
  • B60C11/03—Tread patterns
  • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
  • B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
  • B60C11/1218—Three-dimensional shape with regard to depth and extending direction
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D30/00—Producing pneumatic or solid tyres or parts thereof
  • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
  • B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
  • B29D30/0606—Vulcanising moulds not integral with vulcanising presses
  • B29D2030/0607—Constructional features of the moulds
  • B29D2030/0613—Means, e.g. sipes or blade-like elements, for forming narrow recesses in the tyres, e.g. cuts or incisions for winter tyres
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
  • B60C11/03—Tread patterns
  • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
  • B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
  • B60C2011/1213—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe sinusoidal or zigzag at the tread surface
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
  • B60C11/03—Tread patterns
  • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
  • B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
  • B60C2011/1245—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern being arranged in crossing relation, e.g. sipe mesh

Definitions

• An invention relating to construction of the vulcanization mould for making of winter, summer and/or all-season tires for passenger and cargo vehicles, whereas at the pressing process a lamella forms narrow cuts of the required shape and amount into tread pattern blocks on the tread part defined by a tread area of the tire. Tractions formed provide more effective transfer of forces at the contact of the tread with a road surface
• Tires designed for use on vehicles in winter period as well as during all seasons are characterized in addition to circumferential and transverse tread grooves also by a large number of narrow cuts formed by lamellas positioned in the tread part of the vulcanization mould cavity.
• the lamellas are made of sheet metal by moulding operations, from materials specified with purpose specified properties, such as corrosion resistance, strength and the like. They are unreleasably fastened in the mould ((milled mould, e.g. by gluing), secured against extraction during the mould opening phase. They are positioned in the radial direction with respect to the rotation axis of the tire.
• the lamellas can acquire the depths of tread grooves given by the tire profile, or it can vary depending on the requirements for the tread.
• a shape of the lamella when viewed in the radial direction can be composed from known curves (arc, line, parabola%) and form a certain shape (e.g. function sin, zig-zag).
• the size and the shape are given by design, by desired properties and/or by size of pattern blocks.
• the lamellas used in one pattern can be identical or different in shape.
• the lamellas by their number on winter and all-season tires form a high number of traction edges in order to enhance efficiency of force transmission at the point of pattern contact with the road surface.
• the fact can be utilized on wet, snow-covered and/or icy road surfaces.
• the deformation significantly affects drivability, it has a negative effect on driving stability, and influences a reaction rate of the tread.
• the size of the deformation depends on the nature of the force working at that moment. It is apparent that deformation acquires values of all quadrants of the circle.
• Use of the block having no pattern cuts or grooves is the ideal solution in terms of the deformation in the road plane. As this case is undesired both from legal and technical aspects, the continuous block is necessary to be divided by narrow tread grooves. In order to increase traction properties it is necessary to divide the block by narrow cuts. That negatively affects rigidity of the block.
• cut shapes are used: direct notches with variable depth, variously shaped, but most frequently in the shape resembling a course of the goniometric function sin.
• rigidity of the block is increased, especially in axial direction and partly in tangential direction to the circumference of the tire. The phenomenon results in different distortion of the block in the longitudinal and transverse directions of the cut.
• Axial direction - is the direction given by the automobile tire rotation axis
• Radial direction - is the direction given by the normal axis to the tire circumferential circle and to the rotation axis thereby simultaneously intersected
• Tangential direction - is the direction given by a tangent to the circumferential circle
• Lamella - is a part pressed from a sheet metal, a material of required properties, of a defined thickness, firmly, unreleasably connected with a mould cavity in the tread part giving the shape and dimensions of narrow cuts in tread blocks
• the lamellar cut consists of the main lamellar cut and perpendicular (or under an angle
• the main lamellar cut contains two rows of projections alternately arranged with three flat parts, each of which is provided with secondary lamellar part, whereas the projections and depressions of the bands of the main lamellar cut are shaped as the periodically repeated element in the radial direction at interval 0C, which is formed by the sum of intervals OA, AB and BC, whereas at interval AB the shape is interrupted and replaced by an identical periodically repeated function shifted by one half of the period and at interval BC it regains its original shape, whereas the plane defining the size and shape of the projections, indented from the central plane has a shape of the resulting curve of the bending of the clamped beam on each cut surface, in the axial direction.
• each secondary lamellar cut is symmetrically arranged to the main 3D lamellar cut, which divides it into two halves.
• the secondary lamellar cut can be formed by a smooth flat lamella, or it can also contain 3D elements, which are axially oriented. It is preferred if the 3D element on one half of the secondary lamellar cut is oriented opposite to the 3D element on the other half of the secondary lamellar cut. Both halves of the secondary lamellar cut can be slightly bevelled at interval BC.
• Another subject-matter of the invention is a lamella formed by a combination of the main 3D lamellar part and at minimum one secondary lamellar part, whereas the secondary lamellar part crosses the main 3D lamellar part and is positioned perpendicularly to the main 3D lamellar part, where the main 3D lamellar part is formed as an extension of the periodically repeated shape to the distance equal to the length of interval 0C, which is formed by the sum of intervals OA, AB and BC, whereas the extension of the periodically repeated element is arranged in rows LI, L2 in radial direction, where at interval AB the shape is interrupted and replaced by identical periodically repeated function shifted by one half of the period and at interval BC it regains its original shape, and where alternately with rows LI, L2 flat parts PI, P2, P3 are formed, which contain perpendicularly (or (or under the angle resulting from the required properties) arranged secondary lamellar part, and whereas the plane defining the size and shape of the
• the main 3D lamellar part can contain 2 to 4 rows LI, L2 in radial direction, formed by extension of periodically repeated element to distance 0C, where at interval AB the shape is interrupted and replaced by identical periodically repeated function shifted by one half of the period and at interval BC it regains its original shape.
• the main 3D lamellar part can divide the secondary lamellar part to two identical halves.
• the secondary lamellar part can be flat or it can be provided by at minimum one axially oriented 3D element in each of its halves.
• interval OA : AB : BC can be in proportion of 1/3 / 1/3 / 1/3 or another, such as 0,4:0,3:0,3 with the biggest interval of the first order).
• the lamella consists of two radially arranged rows LI, L2 of projections and depressions of the periodically repeated element at interval 0C, where the main 3D lamellar part is formed as the extension of the periodically repeated shape to the distance equal to the length of interval 0C, where at interval AB the shape is interrupted and replaced by an identical periodically repeated function shifted by one half of the period and at interval BC it regains its original shape, and where between individual rows LI, L2 flat parts PI, P2, P3 are formed, on which the secondary lamellar part is fixed perpendicularly, and whereas the area defining the size and shape of the projections in rows LI and L2 of the main lamellar part, indented from the central plane, has the shape of the resulting curve of the bending of the clamped beam from the view in axial direction and from the view in radial direction it has the shape consisting of the curves selected from the following group: arc, straight line, parabola, hyperbola and /or it
• the body of the lamella will be described merely as a surface consisting of neutral axis during the bending process of the lamella. Radii essential for thin-walled extract production technologies will not be considered.
• the body of the lamella is then formed by a layer of evenly coated material given the neutral surface in the direction of each side of the surface (wall thinning due to the forming process is not considered). Recognized in the art, and by the element geometry it is obvious that lamella type of periodically repeating elements are capable of providing an appropriate force transfer in axial direction. When transferring forces in the tangential direction increased deformation of the pattern blocks occurs (formed lamellas have a more favourable effect on rigidity in tangential direction compared to flat lamellas).
• the invention is based on a combination of the flat lamellas and the lamella of a periodically repeating element in precise number (depending on geometry of the block and desired properties), whereas in the radial direction the shape is discontinued and replaced by the shape of identical periodically repeated element shifted by one half of the period. That prevents long relative movement between individual parts of the tread pattern block and transmission of braking and traction forces, and of movement in curves.
• the block deformation character which can be considered as the clamped beam
• the plane defining the size and shape of the projections, indented from the central plane will have the shape of the final curve of the beam bend.
• Another advantage compared to previously used lamellas is reduction of locking time caused by the horizontal surface of projections, so is the increased rigidity of the pattern block, substantial start of locking, more favourable course of pattern block wearing-off, better transfer of forces when changing motion conditions due to limitation of mutual shifting of individual parts of the tire tread pattern blocks in radial and axial directions resulting in enhanced safety as well as driving comfort.
• the described lamella is shown on Fig. 1.
• a lamella is formed by moulding of a sheet material. Three-dimensional pressed parts designed to be placed in the mould cavity are formed, helping to create a cut in the pattern block of the tread.
• the lamella axis is identical with the neutral axis of the pressed part.
• a shape of the lamella is depicted on Fig. 1, and it is formed as an extension of a periodically repeated shape to a distance equal to the length of interval 0C, at interval AB the shape is discontinued and replaced by an identical periodically repeated function shifted by one half of the period. At interval BC the lamella regains its original shape.
• Interval OA : AB : BC is preferred in proportion 1/3 / 1/3 / 1/3, or in another proportion such 0,4:0,3:0,3 with the biggest interval of the first row. It can be changed in case of other required properties.
• the main 3D lamellar part is formed from metal the sheet with projections at intervals LI, L2 and intervals PI, P2, P3 are without deformation. There is a space for placing a transverse side lamellar part. A number of projections at intervals LI, L2 depends on geometry of the block, the most preferred being number 2.
• FIG. 1 depicts a perspective view on the lamella under the invention.
• Fig. 2 shows a curve of the bending of the clamped beam.
• Figure 3-1 depicts a front view on the lamella
• Fig. 3-2 there is the side view
• figure 3-3 is a top view of the lamella.
• Figures 4-1 to 4-3 depict sections through the lamella marked on figure 4.
• Figures 5-1 to 5-3 depict one pattern block of the tire tread in various states of wear.
• the lamella suitable for fixing inside the vulcanization mould in order to form lamellar cuts in the tire tread pattern block is depicted on Fig. 1 and Fig. 2-2, where intervals OA, AB and BC are marked.
• the main 3D lamellar part contains two rows LI and L2 of shaped projections and depression formed as the extension of the periodically repeated shape to the distance equal to the length of interval 0C in radial direction.
• interval AB the shape is discontinued and replaced by the identical periodically repeated function shifted by one half of the period and at interval BC it regains its original shape.
• the area defining the size and shape of the projections in rows LI and L2, indented from the central plane, has the shape of the resulting curve of the bending of the clamped beam in axial view.
• the curve is depicted on Fig. 2.
• the cut has the shape consisting of the curves selected from the group of: arc, straight line, parabola, hyperbola and/or it form the pattern of the function sin, zig-zag, zigzag with the truncated points as shown on figures 5-1 to 5-3.
• each flat part In the middle of each flat part a side lamellar part is fixed crossways while they form a right angle with the main lamellar part.
• the main 3D lamellar part divides the side lamellar part into two identical halves. Each half of the side lamellar part is provided with the 3D element, approximately at interval BC. In axial direction the 3D elements are oriented mutually opposite direction.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)
• Tires In General (AREA)
• Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=49514008

Family Applications (1)

Country Status (4)

Cited By (3)

Families Citing this family (3)

Citations (8)

Family Cites Families (2)

• 2012
  • 2012-09-25 SK SK50046-2012A patent/SK288470B6/sk unknown
• 2013
  • 2013-09-24 CN CN201380048706.9A patent/CN104640718B/zh active Active
  • 2013-09-24 WO PCT/SK2013/050006 patent/WO2014051528A1/en active Application Filing
  • 2013-09-24 EP EP13784032.8A patent/EP2900491A1/en not_active Withdrawn

Patent Citations (8)

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