| 摘要 |
PCT No. PCT/GB89/00948 Sec. 371 Date Mar. 30, 1990 Sec. 102(e) Date Mar. 30, 1990 PCT Filed Aug. 14, 1989 PCT Pub. No. WO90/01430 PCT Pub. Date Feb. 22, 1990.A vehicle such as a tractor having front and rear drive axles with crown wheel and pinions (10 and 11) driven from a prime mover (E) via an inter-axle differential (12). The rear drive axle has left and right hand brakes (40) and the inter-axle differential has a lock (22, 23, 24) for locking-up the differential. The lock is biased to an engaged condition by a spring (25) and an hydraulic actuator (27). A control system (CS) is provided which is arranged to engage the lock (22, 23, 24) when both rear axle brakes (40) are applied.
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