JPS62152803U

JPS62152803U -

Info

Publication number: JPS62152803U
Application number: JP4069186U
Authority: JP
Priority date: 1986-03-20
Filing date: 1986-03-20
Publication date: 1987-09-28

Description

[Brief explanation of the drawing]

第１図乃至第３図は本考案の実施例を示し、い
ずれもタイヤの子午半断面図、第４図及び第５図
は従来例を示し、いずれもタイヤの子午半断面図
、第６図はタイヤの転動状態を示す説明図、第７
図はタイヤ走行騒音の周波数の音圧レベルの関係
グラフ、第８図は車の走行速度と音圧レベルの関
係グラフ、第９図はタイヤ走行騒音の周波数と音
圧レベルの関係グラフである。１……ビード部、２……カーカス、３……クラ
ウン補強プライ、４……トレツド、５……クラウ
ン部、６……バツトレス部、７……サイド部、８
……ブレーカー。 1 to 3 show an embodiment of the present invention, each of which is a meridional half sectional view of a tire, and FIGS. 4 and 5 show a conventional example, each of which is a meridional half sectional view of a tire. is an explanatory diagram showing the rolling state of the tire, the seventh
The figure is a graph of the relationship between the frequency and sound pressure level of tire running noise, FIG. 8 is a graph of the relationship between vehicle running speed and sound pressure level, and FIG. 9 is a graph of the relationship between the frequency of tire running noise and sound pressure level. 1...Bead part, 2...Carcass, 3...Crown reinforcing ply, 4...Tread, 5...Crown part, 6...Buttress part, 7...Side part, 8
……breaker.

Claims

[Claims for Utility Model Registration] A fiber cord in which a pair of bead parts, a side part, and a crown part extending between both side parts are connected in a toroidal shape, and these parts are arranged at an angle with respect to the center circumference of the tire. In a pneumatic bias tire reinforced with a carcass formed by laminating multiple plies, the safety factor η of the carcass is 7.0 or more, and the rigidity ξc of the crown part and the rigidity ξs of the side parts are
A pneumatic bias tire characterized in that the ratio ξc/ξs is 1.3 to 2.0. However, η=2Tc・Rm〓(sin ² αi・
Ni) 5P (Rm ² - Rv ² ) P: JATMA YEAR BOOK regulations (for unspecified sizes, the maximum air pressure (Kg/cm ² specified in the standard to which the tire conforms)
) Tc: Tensile strength of cord (Kg/piece) αi: Arrangement angle of each ply cord (°) with respect to the central circumferential line (equator line) at the center of the crown part Ni = Number of strikes of each ply cord at the center of the crown part (Pieces/5cm) n: Normal number of carcass plies that counteract internal pressure Rm = Distance to the innermost ply of the carcass body measured from the center of the tire's rotation axis at the center of the crown (cm)
) Rv: (Rm+RR)/2 Here, RR is the radius of the rim used (cm) and ξ=〓〓〓〓Ei・Ai・Ni Ei: Elastic modulus of carcass ply cord or breaker cord (Kg/cm ² ) Ai: Carcass Cross-sectional area of ply cord or breaker cord (cm ² ) Ni: Number of carcass ply cords or breaker cords (pieces/5cm) n: Number of carcass ply cords or breaker cords)