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
  • B60C11/14—Anti-skid inserts, e.g. vulcanised into the tread band
  • B60C11/16—Anti-skid inserts, e.g. vulcanised into the tread band of plug form, e.g. made from metal, textile
  • B60C11/1643—Anti-skid inserts, e.g. vulcanised into the tread band of plug form, e.g. made from metal, textile with special shape of the plug-body portion, i.e. not cylindrical
• • 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
  • B60C11/14—Anti-skid inserts, e.g. vulcanised into the tread band
  • B60C11/16—Anti-skid inserts, e.g. vulcanised into the tread band of plug form, e.g. made from metal, textile
  • B60C11/1643—Anti-skid inserts, e.g. vulcanised into the tread band of plug form, e.g. made from metal, textile with special shape of the plug-body portion, i.e. not cylindrical
  • B60C11/1656—Anti-skid inserts, e.g. vulcanised into the tread band of plug form, e.g. made from metal, textile with special shape of the plug-body portion, i.e. not cylindrical concave or convex, e.g. barrel-shaped

Definitions

• the present invention concerns a fixed spike, respectively a sleeve- mounted spike, fitted on a vehicle tyre.
• the longitudinal forces acting on the spike when the tyre is rolling are due to bending of the body structure, to longitudinal slipping and to the stress wave in the rubber.
• the tyre body undergoes bending such that the radius of the bent part is significally smaller than that of equivalent parts of the load-freetyre. This deflects the spike, which has been mounted at right angles against the surface, to assume a vertical position before contact with the road. Owing to the protrusion of the spike point, however, the spike is not turned into sufficiently upright position: it meets the road surface in an oblique position. At this stage, the forces due to slipping tendency also begin to exert their influence.
• the impact has been found to be due to the kinetic energy of the spike, in other words, to the mass of the spike and its velocity in the direction against the road surface.
• the effective mass is influenced by the spike mass itself and, in addition, by a friction force, its magnitude depending, in its turn, on the spike design in that the friction of a spike body mounted in a sleeve results from sliding between the sleeve and the metallic body, while the friction force of a fixed spike is active between the spike body and the rubber.
• the mass of a fixed spike is influenced, owing to its shaping, partly also by the mass of the surrpunding rubber.
• the shape of the spike has been symmetric and it has been mounted in a hole, perpendicular against the wear surface of the tyre, whereby it meets the road in a slightly oblique position as the forces mentioned affect its position.
• the aim of the invention is to achieve an improvement in currently known fixed spike designs, respectively sleeve-mounted spike designs.
• the more specific aim of the invention is to provide a fixed spike, respectively a sleeve-incunted spike, in which the drawbacks embarrassing designs of prior art have been avoided.
• the aims of the invention are achieved by means of a fixed spike, respectively a sleeve-mounted spike, which is mainly characterized in that the fixed spike, respectively the sleeve-mounted spike, features an asymmetric region which has been disposed to produce a force component turning the fixed spike, respectively the sleeve mounted spike, in such manner that the fixed spike, respectively the sleeve-mounted spike, has been arranged to meet the road surface, at initial contact with the road surface, in a position which is substantially perpendicular.
• the dynamic impact force is reduced by exerting an effect on the spike just before the onset of road contact in that its movement is stopped by directing a lifting force ccanponent thereon.
• the road contact is made less abrasive on the road when the spike is lifted to a more nearly vertical position in relation to the road surface; the more upright position of the spike also reduces the scratcing wear in the terminal part of the road contact area and increases the durability of the spike in the tyre.
• Fig. 1 presents an advantageous embodiment of the fixed spike of the invention.
• Fig. 2 presents an advantageous embodiment of the sleeve-mounted spike of the invention.
• Fig. 1 the fixed spike of the invention in general is indicated by reference numeral 10.
• the fixed spike 10 is composed of a body part 11, a flange part 12 and a point 13.
• the rubber of the vehicle tyre is indicated by reference numeral 14, and the wear surface of the tyre by reference numeral 16.
• the fixed spike 10 is made asymmetric,
• asymnetry has been implemented by designing the flange 12 to be asymmetric on one margin 15.
• the asymmetric part 15 need not necessarily occur on the flange 12: a similar asymmetric part 15 may also be provided on the body part 11.
• the asymmetric part 15 constitutes a kind of beak disposed to take up the resultant of the road contact force, indicated in Fig. 1 by arrows R 0 -R 2 .
• the driving direction is indicated by arrow A and the road surface, by reference numeral 17.
• the sleeve-mounted spike of the invention in general is indicated by reference numeral 20.
• the sleeve-mounted spike 20 consists of a rivet 21, of the flange 22 of the rivet 21, of a point 23 and of a sleeve 24.
• the protrusion of the spike from the wear surface 16 is indicated by e.
• the sleeve 24 is provided with an asymmetric region 25 disposed to take up the resultant R 0 -R 2 of the road contact force in a way similar to that in the embodiment of Fig. 1.
• the asymmetric region is provided on the sleeve at a height which is substantially consistent with the location of the flange 22 of the rivet 21.
• the asymmetric region 25 is a claw-lite region.
• the asymmetric region 25 may, of course, equally be located slightly lower on the sleeve, that is, similarly as in the embodiment of Fig. 1, in other words, in the sleeve region at the height corresponding to the upper part of the rivet 21.
• the other reference numerals correspond to those in the embodiment of Fig. 1.
• the spike of the invention When the spike of the invention is installed in the hole, the spike causes a static stress region in the surrounding rubber. When the stress wave caused by compression of the tyre meets the stress region of the spike asymmetrically, and exceeds it, the spike turns owing to the compressed state of the rubber. At the same time, the spike is influenced by forces arising from the rotation of the tyre. The situation is illustrated by Figs 1 and 2.
• the pressure resultant also moves forward to the point R 2 , whereby it encounters the spike flange and imparts to it an upward acceleration, with the component F 1 , and at the same time turns it from the position as installed to a position more nearly perpendicular against the road surface, with the component F 2 .
• the spike is enabled to turn because there is no compression forward of it. It is possible to influence the utilization of said forces by the mode of installing the spike and by its shape features.
• a shaped structure also creates on the side where said pressure resultants act, a wider local pressure region on which the pressure resultant from the compressed rubber exerts an even sore powerful effect.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Tires In General (AREA)
• Mirrors, Picture Frames, Photograph Stands, And Related Fastening Devices (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8523183

Family Applications (1)

Country Status (6)

Families Citing this family (3)

Citations (1)

Family Cites Families (3)

• 1986
  • 1986-09-19 FI FI863801A patent/FI84455C/fi not_active IP Right Cessation
• 1987
  • 1987-09-18 JP JP62505739A patent/JPH01500815A/ja active Granted
  • 1987-09-18 EP EP87906310A patent/EP0281618B1/en not_active Expired
  • 1987-09-18 WO PCT/FI1987/000123 patent/WO1988001945A1/en active IP Right Grant
  • 1987-09-18 US US07/187,536 patent/US4884608A/en not_active Expired - Fee Related
• 1988
  • 1988-05-11 DK DK258488A patent/DK161877C/da active

Patent Citations (1)

Non-Patent Citations (1)

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