Title:
HYDRAULIC ACTUATOR
Document Type and Number:
WIPO Patent Application WO/1998/007992
Kind Code:
A2
Abstract:
The present invention may be used in excavators, cranes, manipulators, loaders and bulldozers as well as in other machines with multiple engines or in cyclic-action mechanisms comprising hydraulic cylinders and motors. This invention essentially relates to a hydraulic actuator which exhibits high energy-saving capacities due to its reduced fuel and power consumption during combined operations. This device also has an improved reliability and causes little thermal losses thanks to the volume adjustment and energy recovery. The hydraulic actuator of the present invention comprises a pump unit, hydraulic cylinders, hydraulic motors, an inflow and cooling unit, hydraulic distributing devices as well as a working-fluid tank. The pump unit includes at least two adjustable double pumps each consisting of two hydraulic reversible machines having different and varying working volumes. The two hydraulic reversible machines are fitted with control units and are kinetically connected together. The chambers of the hydraulic reversible machines having the largest working volume are connected in closed loop to the chambers of the hydraulic cylinders and motors. One of the chambers of said machines having the smallest working volume is connected by a hydraulic distributing device to the piston cavity of a hydraulic cylinder or to the tank, while the other chamber having the smallest working volume is connected to said tank. The relation between the diameters of the pistons and the diameters of the hydraulic cylinder rods is a function of the relation between the largest and the smallest working volumes of said hydraulic reversible machines.
Inventors:
PASYNKOV RAFAIL MOISEEVICH (RU)
SMOLYANITSKY EDUARD ANATOLIEVI (RU)
LUKASHOV VLADIMIR SEMENOVICH (RU)
SMOLYANITSKY EDUARD ANATOLIEVI (RU)
LUKASHOV VLADIMIR SEMENOVICH (RU)
Application Number:
PCT/RU1997/000265
Publication Date:
February 26, 1998
Filing Date:
August 20, 1997
Export Citation:
Assignee:
PASYNKOV RAFAIL MOISEEVICH (RU)
SMOLYANITSKY EDUARD ANATOLIEVI (RU)
LUKASHOV VLADIMIR SEMENOVICH (RU)
SMOLYANITSKY EDUARD ANATOLIEVI (RU)
LUKASHOV VLADIMIR SEMENOVICH (RU)
International Classes:
E02F9/22; F15B11/17; F15B21/14; (IPC1-7): F15B/
Attorney, Agent or Firm:
Shilan, Konstantin Alexandrovich (ul. Dolgorukovskaya 2, Moscow 6, RU)
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