pneumatic tire

一种充气轮胎、轮胎的技术，应用在特殊轮胎、轮胎零部件、胎沿等方向，能够解决刚性变低等问题，达到提高刚性、减轻轮胎重量、维持行驶性能的效果

CN111405991BActive Publication Date: 2021-01-15THE YOKOHAMA RUBBER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-01-15

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Abstract

To provide a pneumatic tire in which the structure of a bead portion is improved in a pneumatic tire provided with a side reinforcing layer in a side wall portion, thereby enabling a reduction in tire weight while maintaining the durability of the tire. Among the layers constituting the bead core 5 , the width W0 of the layer including the largest number of columns, the width W1 of the innermost side in the tire radial direction, and the width W2 of the outermost side in the tire radial direction satisfy W1>W2 and W2≤0.5×W0 The position of the layer with the width W0 is arranged on the inner side in the tire radial direction of the center position of the bead core 5 in the tire radial direction, and the carcass layer 4 is folded back while being bent along the peripheral edge of the bead core 5 so that The folded portion 4B of the carcass layer 4 extends toward each side wall portion 2 while being in contact with the main body portion 4A of the carcass layer 4 , so that the rubber in the closed area formed by the main body portion 4A of the carcass layer 4 and the folded portion 4B occupies The ratio is 0.1% to 15%, so that the cross-sectional area S2 and hardness H2 of the filler layer 9 disposed outside the carcass layer 4 in the tire width direction and the cross-sectional area S1 and hardness H1 of the side reinforcing layer 8 satisfy 0.12≤(S2×H2 ) / (S1×H1)≤0.50.
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Description

technical field

[0001] The present invention relates to a pneumatic tire provided with a side reinforcing layer in a sidewall portion, and more specifically, to a pneumatic tire capable of reducing the weight of the tire while maintaining the durability of the tire by improving the structure of the bead portion. Background technique

[0002] Generally, bead cores and bead fillers are embedded in bead portions of pneumatic tires. Also, in pneumatic tires (so-called run-flat tires) that can safely travel a certain distance even if a tire blows out, the side reinforcing layer (which is crescent-shaped from the cross-sectional shape) for supporting the load load of the vehicle when the tire blows out A layer made of hard rubber) is provided on the side wall portion. In such a tire, the inner end portion of the side reinforcing layer in the tire radial direction may reach the vicinity of the bead portion, and the vicinity of the bead portion may become thicker, thereby tending t...

Examples

Embodiment

[0052] The tire size is 205 / 55R16 with figure 1 In the basic structure shown, the presence or absence of bead filler arranged between the main body portion of the carcass layer and the turnback portion, and the presence or absence of a filler layer arranged outside the main body portion of the carcass layer and the turnback portion in the tire width direction , the structure of the bead core, the maximum width W0 of the bead core, the width W1 of the innermost layer of the bead core in the tire radial direction, the width W of the outermost layer of the bead core in the tire radial direction, and the difference between the widths W1 and W2 Size relationship, ratio W2 / W0, rubber occupancy in the closed area, cross-sectional area S1 and hardness H1 of the side reinforcement layer, cross-sectional area S2 and hardness H2 of the packing layer, (S2×H2) / (S1×H1), The position of the end of the folded portion of the carcass ply, the ratio IW / BW of the rim width BW to the maximum width...