Pneumatic tire for a heavy duty vehicle
First Claim
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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Accused Products
Abstract
A pneumatic tire for a heavy duty vehicle including a tread surface divided along circumferential directions by at least two tread zigzag grooves to form a plurality of circumferential zigzag ribs comprises stress releasing apertures formed at least in zones of the circumferential ribs which are within distances approximately 30% of widths of the circumferential ribs from the side of the ribs to mitigate stress concentrations in corners of the ribs extending in the tread grooves by reducing rigidities of the corners for preventing railway wear which would otherwise occur in the tire of this kind.
30 Citations
18 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
Specification