| 摘要 |
1,198,173. Pneumatic tyres. MICHELIN & CIE (Compagnie Generale des Etabs. Michelin). 2 Feb., 1968 [6 Feb., 1967], No. 5519/68. Heading B7C. [Also in Division G1] A pneumatic tyre has a pseudo-camber (i.e. a characteristic of a tyre which causes the vehicle on which the tyre is mounted to he subjected to a force the effect of which is analogous to the effect caused by wheel camber) such that when mounted on an axle of a vehicle travelling at 10 km/hr. at tyre design load and pressure on level ground it gives rise to a thrust or a pull on the axle of not more than 6% of the design load of the tyre and is provided with an indication of the orientation of the tyre on the axle required to produce the thrust or pull. A tyre may be provided with a pseudo-camber by introducing asymmetry into the tyre e.g. by making the tread conical or by offsetting the crown reinforcement plies relatively to the tread. The pseudo-camber of a tyre may be measured using the apparatus shown. Two pneumatic tyres 10, 12, of which the pseudo-camber of one is known, and is preferably nil, are fitted on wheels attached to semi-axles 14, 16. Semi-axle 14 is connected to a cylinder 18 and semi-axle 16 is connected to a plunger 20, provided with a pointer 26, which is registered against a scale 28, and operable against two calibrated springs 22, 24 mounted between the plunger and cylinder. |
