摘要:
A pneumatic radial tire including a belt reinforcing layer or layers formed by spirally continuously winding a single organic fiber cord in a manner such that before the molding of an unvulcanized tire, the belt reinforcing layer or an outer or outermost belt reinforcing layer has a greater density of winding of the organic fiber cord in its regions located beneath or inner to a main groove-forming rib of a mold than in its remaining region, whereby after the molding of the unvulcanized tire, the cord density in the regions of the belt reinforcing layer or the outer or outermost belt reinforcing layer beneath or inner to the main groove-forming rib is set to be substantially identical with the cord density in its remaining region; and a process for the production of such tire.
摘要:
A pneumatic radial tire for a passenger vehicle, characterized in that at least a portion of a carcass line extending radially outwardly from the maximum width position in a carcass line of a tire fitted to a normal rim and inflated up to its normal internal pressure is configured so as to substantially conform to an equilibrium carcass line expressed by the following equations (1) and (2) calculated by using an internal pressure allotment ratio g(y) of a carcass layer at the tread portion that is obtained by setting the distributional configuration index .alpha. of the following equation (3) at 4 or more, and that a tread pattern having a directional property is provided to the tread surface thereof, wherein: ##EQU1## wherein, provided that a line drawn vertically downwardly from the center of the tread portion to the axle of the tire is y axis of coordinates with the axle of the tire being z axis of coordinates, y.sub.A, y.sub.D, y.sub.C, y.sub.B and .eta. denote as follows:y.sub.A : y axis of coordinates for the carcass line at the center of the tread portion;y.sub.D : y axis of coordinates for the carcass line at the effective width end portion of the belt layer;y.sub.C : y axis of coordinates for the carcass line at the maximum width position in a tire carcass line;y.sub.B : y axis of coordinates for the carcass line at the bead portion; and.eta.: the internal pressure allotment ratio of the carcass layer at the center of the tread portion.
摘要:
An pneumatic radial tire for a passenger car having an improved durability, which tire has a carcass layer formed of aromatic plyamide cords in which an end portion of the carcass layer is turned up around an annular bead wire and a lower bead filler from the inside to the outside of the tire to form a turnup portion which is extended along the main body of the carcass layer, wherein an upper bead filler having a JIS hardness of from 75 to 95 is disposed axially outside the turnup portion, and wherein the height b (mm) of the lower bead filler relative to the height a (mm) of a rim flange upon which the tire is mounted satisfies the formula:(a-5)
摘要:
A pneumatic tire having on its tread surface a tread pattern formed by grooves and having a tread rubber of a two-layer structure comprising a cap rubber layer and a base rubber layer of which the latter comprises a rubber having a lower heat generating characteristic in comparison to a rubber forming the former, the tire being characterized by having a value within the range of from 0.15 to 0.35 for (Gc/G).times.(Eb/Ec), in which G is the total thickness of the tread rubber at the bottom of grooves in the tread pattern, Gc being the thickness of the cap rubber at the bottom of the tread pattern groove, Eb being the modulus at 25% elongation of the base rubber layer, Ec being the comparable modulus of the rubber of the cap rubber layer.
摘要:
Provided is a non-pneumatic tire in which buckling can be prevented without a weight increase, the non-pneumatic tire including a spoke structure. The spoke structure is obtained by circumferentially arranging spokes intermittently at intervals and coupling together annular cylindrical outer member and cylindrical inner. The spoke structure is joined to an inner peripheral side of a tread ring. At least some of a plurality of spaces formed between two spokes adjacent to each other in the tire circumferential direction have an air-containing structure.
摘要:
A method for measuring deformation of a tire tread is provided. The method uses a tire tread deformation producing system 10 including a flat, transparent base plate 24 having first and second opposite surfaces 24a and 24b. The method also uses a vision system 12 including a pair of CCD cameras 30-1 and 30-2, which are positioned on the side of the second surface of the base plate. A test tire 14 has a tire tread having tread grooves 16. A portion of the tire tread of the test tire is urged against the first surface of the base plate. The three-dimensional shape of a groove wall surface of a tread groove of the test tire is measured by imaging the tread groove across the base plate by the CCD cameras while the test tire is subject to deformation.
摘要:
A pneumatic tire including a carcass layer mounted between a pair of bead portions, at least two layers of a belt layer disposed on an outer circumferential side of the carcass layer corresponding to a tread portion, and a belt reinforcing layer having a strip material including at least one fiber cord wrapped spirally in a tire circumferential direction on an outer circumferential side of the belt layers, wherein the belt reinforcing layer has a center portion reinforcing layer for reinforcing a center portion of the belt layers and edge portion reinforcing layers for reinforcing edge portions of the belt layers, the center portion reinforcing layer and the edge portion reinforcing layers are mutually separated, a width of the center portion reinforcing layer is from 5% to 25% of a width of a belt layer having a smallest width, and a width of the edge portion reinforcing layers is from 10% to 35% of the width of the belt layer having the smallest width.
摘要:
Tire transient response data during cornering with a slip angle is calculated based on a tire dynamic model. A deformation response of a tread part in the tire dynamic is set as a first-order-lag response. The value of the transient response parameter is initialized, to define the first-order-lag response. The time-series data of the transient response of the slip angle between the tread part and a road surface in the tire dynamic model is obtained by computing a convolution integral of the defined response function of the first-order-lag response with a time gradient of the time-series data of the slip angle. A value of a lateral force is calculated by using the tire dynamic model based on the obtained time-series data of the transient response of the slip angle. Accordingly, the transient response data is calculated, and a value of the transient response parameter is obtained.
摘要:
A pneumatic radial tire having a rubber sheet incorporated in a region lying between a bead core and at least an outer surface portion of the bead portion which is in contact with a rim on which the tire is mounted, to suppress the noise generation. The rubber sheet has a dynamic modulus of elasticity at 20.degree. C., E'(20.degree. C.), of 6.0 MPa to 14.0 MPa and a ration of the dynamic modulus E'(20.degree. C.) to a dynamic modulus of elasticity at 60.degree. C., E'(60.degree. C.), namely E'(20.degree. C.)/E'(60.degree. C.), of at least 1.2 but less than 1.4.
摘要:
A method for measuring deformation of a tire tread is provided. The method uses a tire tread deformation producing system 10 including a flat, transparent base plate 24 having first and second opposite surfaces 24a and 24b. The method also uses a vision system 12 including a pair of CCD cameras 30-1 and 30-2, which are positioned on the side of the second surface of the base plate. A test tire 14 has a tire tread having tread grooves 16. A portion of the tire tread of the test tire is urged against the first surface of the base plate. The three-dimensional shape of a groove wall surface of a tread groove of the test tire is measured by imaging the tread groove across the base plate by the CCD cameras while the test tire is subject to deformation.