irreversible steering gear 自锁转向装置
不可逆转向装置
Irreversible steering gear \Ir`re*vers"i*ble steering gear\
(Mach.)
A steering gear, esp. for an automobile, not affected by the
road wheels, as when they strike an obstacle side ways, but
easily controlled by the hand wheel or steering lever.
[Webster 1913 Suppl.]