Four-wheel drive assist for electric machines

B - Operations – Transporting – 60 – K

Patent

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Details

B60K 17/356 (2006.01) B60K 7/00 (2006.01) B60K 17/04 (2006.01) B60K 17/10 (2006.01)

Patent

CA 2406751

A four-wheel drive assist for electric machines includes an electric drive system (14) for driving wheels at a non-steering end and a selectively operable hydraulic system for driving wheels at a steering end. A controller (24) controls the operation of the drive system according to operator selection and/or by detecting slipping of the electric drive system. Preferably, at least one hydraulically driven operating arm, including boom function (33), lift platform, etc., is driven by the same hydraulic pump (32) that drives the steering end hydraulic system. The machine thus is capable of effecting four-wheel drive when necessary, while operating as efficiently as a conventional two-wheel drive full electric machine when the four-wheel drive system is not engaged.

L'invention porte sur une propulsion d'appoint sur quatre roues pour engin électrique dont les roues non directrices sont entraînées par des moteurs électriques (14) et les roues directrices par un système hydraulique (14) sélectionnable. Un régulateur (24) gère le fonctionnement du système d'entraînement selon le choix du conducteur et/ou par détection du patinage du moteur électrique. C'est de préférence la même pompe hydraulique (32) qui entraîne au moins un bras de travail hydraulique y compris une flèche (33), une plate-forme élévatrice, etc., ainsi que les moteurs hydrauliques de l'essieu directeur. L'engin peut ainsi disposer de 4 roues motrices en cas de besoin et fonctionner en temps normal aussi efficacement qu'un engin à propulsion entièrement électrique sur deux roues.

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