Apparatus for controlling pivoting of axles in industrial...

B - Operations – Transporting – 60 – G

Patent

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Details

B60G 17/08 (2006.01) B60G 17/005 (2006.01) B62D 5/06 (2006.01) B66F 9/06 (2006.01)

Patent

CA 2249160

An apparatus for controlling pivoting of a forklift rear axle. A hydraulic damper is arranged between a rear axle and a forklift body. The damper includes two oil chambers. The oil chambers are connected to a first passage and a second passage. A two-way switch valve is arranged between the oil chambers. The valve permits the flow of oil between the oil chambers and allows pivoting of the rear axle when opened. The valve restricts the flow of oil between the oil chambers and prohibits pivoting of the rear axle thereby locking the rear axle when closed. When the rear axle is released from a locked state, the valve repeats a valve cycle, which includes opening and closing the valve, to regulate the amount of fluid that flows between the chambers. The valve is then kept in an opened state. This prevents shock that may be produced by sudden tilting of the body when the rear axle is released from a locked state.

Appareil conçu pour commander le pivotement d'un essieu arrière à fourche. Un amortisseur hydraulique, disposé entre l'essieu arrière et le corps de la fourche, est constitué de deux chambres de graissage. Ces dernières sont reliées à un premier canal et à un deuxième canal. Une soupape de dérivation à deux voies, disposée entre les chambres de graissage, permet à l'huile de s'écouler entre les deux chambres de graissage; la soupape permet à l'essieu arrière de pivoter lorsqu'elle est ouverte. La soupape limite l'écoulement de l'huile entre les chambres de graissage et, lorsqu'elle est fermée, bloque l'essieu arrière pour l'empêcher de tourner. Lorsque le blocage de l'essieu arrière se termine, la soupape répète un cycle de fonctionnement, qui comprend son ouverture et sa fermeture, pour réguler la quantité de liquide s'écoulant entre les chambres. La soupape est alors maintenue fermée. On empêche ainsi qu'un choc provoqué par le brusque basculement du corps se produise lorsqu'on débloque l'essieu arrière.

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