Abstract:
The invention relates to a vehicle braking system comprising a gas hydraulic accumulator (10) with a housing (12), whose interior is divided by metal bellows (16) into a gas-filled gas chamber (20) and a fluid chamber (22). A pressurised fluid can be supplied to and conveyed from said fluid chamber (22) via a supply line (24). A valve assembly (74) is provided between the fluid chamber (22) and the supply line (24), which closes if the pressure in the supply line (24) falls below a minimum value and opens if the pressure exceeds said minimum value. In to order to increase the operating security of the gas hydraulic accumulator (10), the valve assembly (74) closes if the pressure in the supply line (24) exceeds a maximum value and opens if the pressure falls below said maximum value.
Abstract:
The invention relates to a hydropneumatic pressure accumulator, comprising a gas chamber (7), an oil chamber (8) and a pair of metal bellows (9) which separate said chambers. The accumulator has an end plate (11) which is displaced according to volume changes in the gas chamber and oil chamber. Said accumulator is provided with a valve (15) which releases or blocks the flow of hydraulic fluid out of and into the oil chamber (8) and with a valve lifter (23) that controls the valve. During a displacement of the end plate (11), corresponding to a volume expansion in the gas chamber (7) which exceeds a predetermined maximum value, the valve lifter can be displaced by said end plate (11) into a position which blocks the valve (15). Said valve lifter (23) is connected in a fixed manner to the end plate (11) of the metal bellows (9) and the valve (15) can be blocked in two opposing directions by the displacement of the valve lifter (23).
Abstract:
The invention concerns a sphere, in particular pneumatic, comprising a rigid shell (1) and a deformable flexible membrane (2) fixed inside said shell to define two chambers whereof one at least, called pneumatic chamber (4), is destined to be filled with gas under pressure. The invention is characterised in that the sphere comprises an element (16a) whereof the mechanical properties suddenly change when the temperature reaches a predetermined value causing said element to clear a passage for the gas from the pneumatic chamber (4) through which the gas escapes, to reduce the pressure inside said pneumatic chamber. The invention is applicable to motor vehicle suspensions.
Abstract:
The invention concerns a method of measuring the pressure of a gas in a gas accumulator which can be connected up to a hydraulic-fluid circuit and in which the gas is separated from the fluid by a dividing element. When the dividing element (12) is in a given position, the gas pressure corresponding to this position is measured by a pressure sensor (40) located on the fluid side of the element. This makes it possible to check the starting pressure in a gas accumulator without affecting the operational readiness of the accumulator with regard to its associated hydraulic-fluid circuit. The invention also concerns a device for carrying out this method.
Abstract:
Cet accumulateur de pression pour véhicule comprend une enceinte (22) en matière thermoplastique, un enroulement filamentaire (24) autour de l'enceinte, une vessie et un insert (20, 30). L'insert est constitué majoritairement par une première matière et au moins en partie par une seconde matière qui est une matière thermoplastique apte à être soudée avec la matière constituant l'enceinte. De plus, l'insert est monobloc et est conformé de manière à ne pouvoir être séparé après soudage de l'enceinte que par destruction de cette dernière ou de l'insert, et il comprend en outre des moyens aptes à assurer l'étanchéité entre la première matière et la seconde matière.
Abstract:
This disclosure includes systems and methods for actuation of subsea hydraulically actuated devices. Some systems use or include one or more subsea reservoirs, each having a body defining an interior volume configured to contain a sub-ambient internal pressure, the body defining an outlet in fluid communication with the interior volume, and a hydraulic power delivery system including one or more subsea valves configured to selectively allow fluid communication between the outlet of at least one of the reservoir(s) and a first port of the hydraulically actuated device. In some systems, the hydraulic power delivery system includes a rigid sliding member configured to unseal a selectively sealed outlet of at least one of the reservoir(s). In some systems, the subsea valve(s) are configured to alternatively allow fluid communication between the outlet of the at least one of the reservoir(s) and the first or a second port of the hydraulically actuated device.
Abstract:
Provided is a hydraulic circuit capable of efficiently recovering one and the other hydraulic energies for utilization by separating and recovering the same, one hydraulic energy being extruded from a hydraulic cylinder and the other hydraulic energy being extruded in starting and stopping rotation of a hydraulic motor, so as to allow an energy density of an accumulator to increase. The hydraulic circuit has: a first accumulator (61) that accumulates pressure of hydraulic oil extruded from a boom cylinder (7cl); and a second accumulator,(125) that accumulates one pressure of the hydraulic oil relieved when the rotation of a swing motor (3m) is started and another pressure of the hydraulic oil extruded from a motor driving circuit (C) with inertial rotation of the swing motor (3m) when the rotation of the swing motor (3m) is stopped. A solenoid switch valve (127) is provided in passages (123, 129) that connect the first accumulator (61) and the second accumulator (125) so as to communicate therebetween. The solenoid switch valve (127) serves to close the passages (123, 129) when pressure is accumulated in the second accumulator (125) and to open when the pressure in the second accumulator (125) is discharged.
Abstract:
An oil level control device in a main tank of a supply circuit, the supply circuit comprising: a main tank (4); a first pump (1) which, in aspiration, is connected to the main tank (4); a main hydraulic circuit (100), which is connected in inlet to the delivery of said charge pump 1 and in outlet is connected to the main tank (4); a first auxiliary conduit (11), an auxiliary tank (5) which receives oil from the first auxiliary conduit (11) and which in discharge is placed in communication with the main tank (4); at least a control valve (8), predisposed to control sending of oil from the first auxiliary conduit (11) to the auxiliary tank (5) or from the auxiliary tank (5) to the main tank (4).
Abstract:
The invention is an accumulator system in which multiple elastomeric accumulators are attached in series or parallel in order to generate total differential pressure in excess of that generated in a non-series system. Also disclosed is a "stacked" accumulator system. The system stores energy when the accumulators deform from their original shape in response to the flow of a pressurized fluid. The stored energy is available for use when the fluid is released from the accumulators and the accumulators return to their original shape.