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A platform for research: civil engineering, architecture and urbanism
HYDRAULIC DRIVE DEVICE FOR CONSTRUCTION MACHINERY
The object is to make it possible to efficiently utilize rated output torque of the prime mover by performing total torque control with high precision through precise detection of absorption torque of the other hydraulic pump by use of a purely hydraulic structure and feedback of the absorption torque to the one hydraulic pump's side. For this purpose, the hydraulic drive system is equipped with: a torque feedback circuit 112v which is supplied with delivery pressure of a main pump 202 and load sensing drive pressure, modifies the delivery pressure of the main pump 202 to achieve a characteristic simulating the absorption torque of the main pump 202, and outputs the modified pressure; and a torque feedback piston 112f which is supplied with output pressure of the torque feedback circuit and controls displacement of a main pump 102 so as to decrease the displacement of the main pump 102 and thereby decrease maximum torque T12max as the output pressure increases. The torque feedback circuit 112v includes first and second variable pressure reducing valves 112g and 112q.
HYDRAULIC DRIVE DEVICE FOR CONSTRUCTION MACHINERY
The object is to make it possible to efficiently utilize rated output torque of the prime mover by performing total torque control with high precision through precise detection of absorption torque of the other hydraulic pump by use of a purely hydraulic structure and feedback of the absorption torque to the one hydraulic pump's side. For this purpose, the hydraulic drive system is equipped with: a torque feedback circuit 112v which is supplied with delivery pressure of a main pump 202 and load sensing drive pressure, modifies the delivery pressure of the main pump 202 to achieve a characteristic simulating the absorption torque of the main pump 202, and outputs the modified pressure; and a torque feedback piston 112f which is supplied with output pressure of the torque feedback circuit and controls displacement of a main pump 102 so as to decrease the displacement of the main pump 102 and thereby decrease maximum torque T12max as the output pressure increases. The torque feedback circuit 112v includes first and second variable pressure reducing valves 112g and 112q.
HYDRAULIC DRIVE DEVICE FOR CONSTRUCTION MACHINERY
HYDRAULISCHE ANTRIEBSVORRICHTUNG FÜR EINE BAUMASCHINE
DISPOSITIF D'ENTRAINEMENT HYDRAULIQUE POUR ENGINS DE CHANTIER
TAKAHASHI KIWAMU (author) / TSURUGA YASUTAKA (author) / MORI KAZUSHIGE (author) / TAKEBAYASHI YOSHIFUMI (author) / NAKAMURA NATSUKI (author) / OKAZAKI YASUHARU (author) / YAMADA KENJI (author)
2019-10-16
Patent
Electronic Resource
English