Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1994-08-26
1995-12-26
Look, Edward K.
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
60417, 60426, 60428, 60494, F16D 3102
Patent
active
054776775
DESCRIPTION:
BRIEF SUMMARY
PCT APPLICATION
[PCT/EP92/02797. Application date Dec. 3, 1992. Priority claimed from Dec. 4, 1991, Czechoslovakia, PV 3680-91. Applicant: HYDAC TECHNOLOGY GmbH, Germany. Inventor: Frantisek KRNAVEK. International publication number WO 93/11363. International publication date: Jun. 10, 1993. States included: CS, JP, US. European patent states --AT, BE, CH, DE, DK, ES, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE.]
The invention relates to a device for the recovery of energy, especially the recovery of potential energy in working machines, with a hydraulically operable working cylinder which is connected to a hydropneumatic storage. Such devices are also to be used as devices for the recovery of energy. Such devices can be used by any type of working machine which has a working cylinder or a hydraulically operated in-line motor. They are used particularly in construction and earthworking machines, such as for example a hydraulically operated bucket dredge or power shovel [hereinafter power shovel].
Such a device is already known from British Patent 1 231 585. In this known power shovel device, when the arm is lowered a portion of the hydraulic energy in the working cylinder is held back in the storage and a resulting volume of fluid is fed back into the reservoir after being moved to a predeterminable position by the arm controlled by a control key. Then for raising the arm, the energy which is thus stored in the form of the fluid pre-stored in the storage can be fed back into this arrangement to support and assist the working cylinder. This known device is not in a position to facilitate adequate energy recovery from the storage to any degree worth mentioning.
With other known devices for recovery of potential energy, this energy, in the form of hydrostatic energy, is held back with the aid of a system of proportional hydraulic distributors. The devices are complicated and thus are not very lucrative.
With another known device for recovery of the potential energy (Poland Patent 127 710), the working member is provided with an additional hydraulic in-line motor (working cylinder) of simple operation, which is mounted between the machine frame and the working member and is series-connected with a hydropneumatic storage [accumulator] and also with a container or a hydrogenerator, by means of a distributor. With this device the extremely high construction costs are a drawback, especially relative to the additional in-line motor and the distributor, which thus lowers the cost effectiveness of the device.
In another known device for recovery of potential energy (Czech Author's Certificate 268 933), the working member is provided with an accumulator/storage-in-line motor, of which the piston chamber is filled with compressed gas and is connected with the storage reservoir of the same. This device cannot be totally sealed, as a result of unintended gas leakage, so that the device can lose its functional capacity after a relatively short time. Also, the static carrying capacity [bearing strength, supporting capacity] is not constant, since the gas pressure is variable in relation to the position of the working member of the power shovel. Furthermore the maximum-acting lift force of the machine can be attained only together with the additional hydraulic working cylinder.
Another drawback of all of the previously known devices for recovery of the potential or kinetic energy of that sort of working member resides in that the acting force decreases when the working member is lowered.
Based on this state of the art, the object of the invention is to disclose an improved device for recovery of energy.
One important problem is solved with the features of the present invention. Two working cylinders are connected carrying fluid one above the other on the rod side and are attached to a hydraulic circuit which has at least one pump, the volume of fluid of the working cylinder on the piston side, which is connected with the storage, can be completely transferred or released into this storage, whereupon the procedure can be repeate
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patent: 5245826 (1993-08-01), Roth et al.
Mannesmann Rexroth brochure RD 81 81010/6.86; Jun. 1986.
Hydac Technology GmbH
Look Edward K.
Nguyen Hoang
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