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Pneumatic tire for a heavy duty vehicle

  • US 4,266,592 A
  • Filed: 08/03/1979
  • Issued: 05/12/1981
  • Est. Priority Date: 08/04/1978
  • Status: Expired due to Term
First Claim
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1. In a pneumatic tire for a heavy duty vehicle including a tread surface divided along circumferential directions by at least two zigzag tread grooves having sides extending into said tread surface to form a plurality of circumferential zigzag ribs having corners and a central zone, the improvement comprising:

  • stress releasing apertures(a) formed at least in zones of said circumferential ribs which are within distances approximately 30% of widths of the circumferential ribs from the sides thereof;

    (b) said apertures formed in extending corners of the ribs being more than those formed in retracting corners adjacent thereto;

    (c) said apertures formed in the extending corners of the ribs being greater in number than those in said central zone of the ribs; and

    (d) depths of said apertures being 0.3-1.0 of depths of the tread grooves.

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