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公开(公告)号：US20200369097A1
公开(公告)日：2020-11-26
申请号：US16968556
申请日：2018-12-27
发明人： Risa Tauchi
摘要： In a pneumatic tire on a rim with 5° taper, a bead core includes a bead core bottom inclined 0° to 5° with respect to a rotation axis in a direction in which the bead core bottom extends outward in a radial direction from an inner side toward an outer side in the lateral direction, a bead portion includes a bead base portion inclined 8° to 12° with respect to the rotation axis in a direction in which the bead base portion extends outward in the radial direction from the inner side toward the outer side in the lateral direction. A bead width BW is a distance between tire inner and outer surfaces on a straight line through a bead core center in the meridian cross-section and parallel to the bead base portion. The bead core has a maximum width CW within a range of (BW×0.54)≤CW≤(BW×0.58).
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公开(公告)号：US10150338B2
公开(公告)日：2018-12-11
申请号：US15328464
申请日：2015-07-23
摘要： Provided is a heavy duty pneumatic tire that includes a tread portion including, in a tread pattern: shoulder lug grooves extending outward in the tire width direction and opening at ground contact edges; a pair of circumferential primary grooves; center lug grooves; center blocks defined by the center lug grooves and the pair of circumferential primary grooves and aligned in the tire circumferential direction; and circumferential secondary grooves extending in the tire circumferential direction in the center block regions and opening to the center lug grooves adjoining the center blocks. The circumferential secondary grooves extend in the tire circumferential direction while changing positions in the tire width direction and each include third groove turning portions formed into a bent shape or a curved shape. The ratio P4/P1 of the width P4 of the circumferential secondary grooves to the width P1 of the circumferential primary grooves is from 0.70 to 1.10.
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公开(公告)号：US10071602B2
公开(公告)日：2018-09-11
申请号：US15328434
申请日：2015-07-23
发明人： Takamasa Motomitsu , Shoei Kakuta , Hideki Hamanaka , Yukihito Yamaguchi , Risa Tauchi , Toshiyuki Sato
CPC分类号： B60C11/13 , B60C9/18 , B60C9/28 , B60C11/03 , B60C11/0311 , B60C11/11 , B60C2009/2016 , B60C2011/0346 , B60C2011/0353 , B60C2011/0355 , B60C2011/0365 , B60C2011/1361 , B60C2200/065
摘要： A tread pattern is provided with: shoulder lug grooves open at ground contact edges; center lug grooves having two ends; circumferential primary grooves formed in a wave-like shape by alternately connecting ends of the center lug grooves and the inner ends in the tire width direction of the shoulder lug grooves; and center blocks defined by the center lug grooves and the pair of circumferential primary grooves. The belt portion of the tire includes first cross belt layers and second cross belt layers. The ratio of the width WB of the center blocks in the tire width direction to the belt width W1 of the belt layer having the shortest width in the tire width direction among the first cross belt layers is in the range from 0.6 to 0.9.
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公开(公告)号：US20170217255A1
公开(公告)日：2017-08-03
申请号：US15328440
申请日：2015-07-23
CPC分类号： B60C11/13 , B60C11/00 , B60C11/03 , B60C11/0304 , B60C11/0309 , B60C11/11 , B60C2011/0025 , B60C2011/0346 , B60C2011/0348 , B60C2011/0351 , B60C2011/0353 , B60C2011/0355 , B60C2011/0365 , B60C2011/1361 , B60C2200/065
摘要： A pneumatic tire with improved heat build-up resistance in a land portion in a tread center region. The pneumatic tire is provided with a tread pattern that includes a plurality of center lug grooves (14) disposed at intervals in a tire circumferential direction that cross a tire equator line; a plurality of shoulder lug grooves (12A, 12B) disposed in intervals between the plurality of center lug grooves in the tire circumferential direction extending outward in the tire width direction, an inner end in the tire width direction being disposed outward of an end of the center lug groove in the tire width direction; a pair of circumferential primary grooves (11A, 11B) extending around an entire circumference of the pneumatic tire in a wave-like shape with the ends of the center lug grooves and the inner ends of the plurality of shoulder lug grooves in the tire width direction alternately connecting to the pair of circumferential primary grooves (11A, 11B); and a circumferential secondary groove (10) disposed on the tire equator line around the entire circumference of the pneumatic tire that intersects the center lug grooves. A straight line that joins an intersection portion between the center lug groove and the circumferential secondary groove and the end of the center lug groove has an inclination angle with respect to the tire circumferential direction ranging from 55° to 75°.
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公开(公告)号：US11241921B2
公开(公告)日：2022-02-08
申请号：US16968556
申请日：2018-12-27
发明人： Risa Tauchi
IPC分类号： B60C15/04 , B60C15/06 , B60C15/024 , B60C15/00
摘要： In a pneumatic tire on a rim with 5° taper, a bead core includes a bead core bottom inclined 0° to 5° with respect to a rotation axis in a direction in which the bead core bottom extends outward in a radial direction from an inner side toward an outer side in the lateral direction, a bead portion includes a bead base portion inclined 8° to 12° with respect to the rotation axis in a direction in which the bead base portion extends outward in the radial direction from the inner side toward the outer side in the lateral direction. A bead width BW is a distance between tire inner and outer surfaces on a straight line through a bead core center in the meridian cross-section and parallel to the bead base portion. The bead core has a maximum width CW within a range of (BW×0.54)≤CW≤(BW×0.58).
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公开(公告)号：US20190047329A1
公开(公告)日：2019-02-14
申请号：US16073684
申请日：2017-01-26
发明人： Risa Tauchi
摘要： A pneumatic tire includes a tread portion with shoulder lug grooves spaced apart in a circumferential direction, each extending outward in a tire lateral direction, opening to a ground contact end, and including a closed end inward in the tire lateral direction. In a region of each of the shoulder lug grooves from an end of a belt having a greatest width in a belt portion of the pneumatic tire to an inner side in the tire lateral direction, the shoulder lug groove has a groove width that decreases inward in the tire lateral direction, and includes a portion where a groove cross-sectional area is kept constant by a change in at least one of a groove wall angle or a groove depth of the shoulder lug groove, the portion being provided in the tire lateral direction across a length of at least 20% of half a tire development width.
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公开(公告)号：US10040320B2
公开(公告)日：2018-08-07
申请号：US15328468
申请日：2015-07-23
摘要： The present technology provides a heavy duty pneumatic tire with a tread portion having a tread pattern including: a pair of circumferential primary grooves defined in a wave-like shape and extending in the tire circumferential direction; center lug grooves; center blocks; and circumferential secondary grooves extending in regions of the center blocks and open to the center lug grooves. The center lug grooves have two groove turning portions turned in a bend shape or a curved shape. The circumferential secondary grooves extend in an inclined manner relative to the tire circumferential direction. An inclination angle (θ4) of the circumferential secondary grooves relative to the tire circumferential direction is different from an inclination angle (θ1) of portions of the circumferential primary grooves relative to the tire circumferential direction, the portions extending toward the same side as a side in the tire width direction, toward which the circumferential secondary grooves are inclined.
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公开(公告)号：US20170239999A1
公开(公告)日：2017-08-24
申请号：US15519501
申请日：2015-10-05
CPC分类号： B60C11/11 , B60C11/0304 , B60C11/0311 , B60C11/13 , B60C11/1369 , B60C2011/0346 , B60C2011/0353 , B60C2011/0355 , B60C2011/0372 , B60C2200/065
摘要： A pneumatic tire includes a plurality of center lug grooves disposed at intervals in a tire circumferential direction that extend crossing a tire equator line and include a first groove turning portion and a second groove turning portion; a plurality of shoulder lug grooves disposed in the intervals between the plurality of center lug grooves in the tire circumferential direction extending outward in the tire width direction, an inner end in the tire width direction being disposed outward of an end of the center lug groove in the tire width direction; a pair of circumferential main grooves to which the ends of the center lug grooves and the inner ends of the plurality of shoulder lug grooves in the tire width direction alternately connect; and a circumferential secondary groove disposed around the entire circumference of the pneumatic tire with a wave-like shape.
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公开(公告)号：US11065915B2
公开(公告)日：2021-07-20
申请号：US16070247
申请日：2017-01-12
发明人： Risa Tauchi
摘要： A pneumatic tire includes cross belts and one or more protective belts provided in the tire radial direction. A width of a widest protective belt is greater than a width of any of the cross belts. In the tire profile, a maximum projection position of the widest protective belt is A, an end position of the widest protective belt is B, a position at which a straight line a passing through position A extending in the direction normal to a tread surface intersects with the tread surface is A′, and a position at which a straight line b passing through position B extending in the direction normal to the tread surface intersects with the tread surface is B′. An angle formed between a first straight line that links position A and position B and a second straight line that links position A′ and position B′ is from 0° to 15°.
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公开(公告)号：US20210107321A1
公开(公告)日：2021-04-15
申请号：US17044858
申请日：2019-04-03
发明人： Risa Tauchi
IPC分类号： B60C15/024 , B60C15/06
摘要： A pneumatic tire is mounted on a 5° rim. A bead core includes a bottom inclined 0°-5° in a direction in which the bottom diverges outward in the radial direction as the bottom extends from an inner side toward an outer side in the width direction. A bead includes a base, a toe, a heel, and a back surface. The heel connects to the back surface by an arc. The base includes a region between a core lower inner end position on an inner circumferential surface of the bead and being identical to a position of a bead core inner end and a core lower outer end position on an inner circumferential surface of the bead and being identical to a position of a bead core outer end in the width direction. The base has a curved line projecting toward the inner side in the radial direction in a cross-section.
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