pneumatic tire

A technology for pneumatic tires and tires, applied in tire parts, tire tread/tread pattern, transportation and packaging, etc. It can improve the performance of snow road, improve the drainage performance and improve the drainage resistance.

CN104723799BActive Publication Date: 2017-10-20SUMITOMO RUBBER IND LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-10-20

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Abstract

The present invention provides a pneumatic tire which improves drainage performance, snow road performance and icy road performance in a balanced manner. Intermediate blocks (6) divided by shoulder main grooves (3A), central main grooves (3B) and intermediate lateral grooves (4B) are provided at intervals on the tread portion (2). The average groove width W2g of the middle lateral groove (4B) is 7% to 11% of the maximum length La of the middle block in the tire circumferential direction. The middle block lateral edge (10) consists of a middle inner part (11) extending obliquely to one side from the central main groove, a middle central part (12) connected to the middle inner part and bent to one side, and a middle central part (12) connected to the middle central part. The middle outer part (13) is connected to the outer part and inclined to one side and connected to the shoulder main groove. In addition, the middle inner longitudinal edge (17) and the middle outer longitudinal edge (18) are composed of a plurality of circumferential pieces (20) inclined opposite to the direction of the middle inner portion, and axial pieces (21) connecting the circumferential pieces. ) to form bumps.
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Description

technical field

[0001] The present invention relates to a pneumatic tire that suppresses a decrease in drainage performance and improves performance on snowy roads and performance on icy roads in a balanced manner. Background technique

[0002] Pneumatic tires for winter travel not only on snowy roads and icy roads but also on wet roads and the like. Therefore, not only snow performance and icy road performance but also high drainage performance are required for the above-mentioned winter pneumatic tires.

[0003] For example, in order to improve performance on icy roads, it has been proposed to increase the ground contact area of ​​the tread portion for the purpose of increasing pattern rigidity and frictional force. However, in this method, the groove widths of the main grooves and the lateral grooves are reduced, so there is a problem that drainage performance and snow performance are deteriorated. In this way, the icy road performance, drainage performance, and snow ro...

Examples

Embodiment

[0062] Based on the specifications in Table 1, prototypes with figure 1 as well as Figure 4 The pneumatic tires with the basic pattern size of 195 / 80R15 were tested for drainage performance, icy road performance (braking force) and snow road performance of each test tire. Among them, the general specifications are as follows.

[0063] Tread contact width TW: 161mm

[0064]

[0065] Groove width W1: 4.0~6.8mm

[0066] Groove depth: 12.5mm

[0067] The ratio of the tire axial distance L1 of the groove centerline of the shoulder main groove to the tread contact width TW (L1 / TW): 0.28

[0068] The ratio of the tire axial distance L2 of the groove center line of the central main groove to the tread contact width TW (L2 / TW): 0.10

[0069]

[0070] Groove width W4 of central transverse groove: 2.1~4.5mm

[0071] Groove width W3 of shoulder transverse groove: 2.7~5.9mm

[0072] The average groove width W2g of the middle transverse groove: 3.0mm

[0073] Groove depth: 7.0~...