Abstract:
A hydraulic energy accumulator consisting of a housing with a space for inserting metal bellows, comprising a non-moveable end and a moveable end with a front wall arranged in a sealed manner on the bellows and separating a hydraulic pressure medium from a pressurized gas is already known per se. The advantage of using metal bellows is that they are gas-tight in so far as no leak arises over time. According to the invention, the bellows are embodied in such a way that the pressure of said bellows in the gas is reduced in comparison with the hydraulic medium as a result of the longitudinal elasticity of said bellows and a sensor system (6) is provided which indicates a longitudinal expansion of the bellows (5) when the hydraulic pressure medium flows through a leak in said bellows into the area containing the gas. The inventive hydraulic energy accumulator (2) and the sensor system (6) thereof are also capable of indicating when such a leak occurs in the bellows. The indication of a leak is also an indication that a motor vehicle braking system fitted therewith has become unsafe.
Abstract:
The present invention relates to a mobile handling arrangement with hydraulic circuit, forming part of which hydraulic part of which hydraulic circuit (L) is a lifting cylinder (1) arranged in a lifting arrangement (100) made for handling a variable load together with an accumulator arrangement (6) for recovering and reusing the lowered load energy, the hydraulic circuit also comprising a variable hydraulic machine (3) having two ports (10, 11), the said hydraulic machine being capable, by way of a drive unit (D), of delivering full system pressure in two directions of flow to the said ports, one port (11) being connected to the said accumulator arrangement (6) and the other port being connected to the said lifting cylinder (1), characterised in that the hydraulic circuit (L) comprises a temperature sensor (95) in connection with a gaseous phase part (68B) of the said accumulator arrangement (6) and a control and feedback unit (94) in communication with the said temperature sensor (95), by means of which the filling level in the said accumulator arrangement (6) is adjusted as a function of the temperature in the said gaseous phase part (68B).
Abstract:
The invention relates to an electrohydraulic unit, especially for antiskid motor vehicle brake systems. The electrohydraulic unit has a hydraulic unit (2) (HCU) comprising a locating body (3) housing electrically controllable valves and a hydraulic pump, an electrically drive device (5) being provided for the pump. Said electrohydraulic unit also comprises a hydraulic fluid accumulator (4) supplied by the pump and having a media separating element (17) and a sensor device (23) including a sensor (25) for monitoring the position of the media separating element (17), in addition to an electronic unit (10) (ECU) for electronically controlling the valves and the drive device (5) and for receiving electrical signals of the sensor device (23). The invention is characterized in that the sensor device (23) is arranged in the locating body (3) or in the electronic unit (10). An electrical connection between the sensor device (23) and the electronic unit (10) extends inside the unit thereby saving space and enabling improved electrical connection.
Abstract:
A method for filling a printing ink reservoir with a housing (1) is disclosed, the interior of which is divided into two chambers (3, 4), by means of a metallic bellows (2), serving as a medium separator. The first chamber (3) is filled with a gas and the second chamber (4) is filed with a fluid. A bottom valve (6) is provided n a hydraulic connection (5), the closing body (7) of which may be operated by the medium separator (2), permitting a filling of the second chamber (4) with fluid and preventing a complete emptying of the second chamber (4). According to the invention, a reliable filling of the said chambers (3, 4) with the corresponding medium may be achieved without damaging the bellows (2), by means of a combination of the following method steps: a) evacuation of the second chamber, b) filling the second chamber with printing ink and c) filling the first chamber with the gas.
Abstract:
The invention relates to a pressure means storage device, comprising a housing (1), the inside of which is divided into two chambers (3, 4) by a media separation element (2). The first chamber (3) is filled with a gas and the second chamber (4) is filled with a liquid. A bottom valve (6) which allows the second chamber (4) to be filled with the liquid and prevents said second chamber (4) from being completely emptied is provided in a hydraulic connection (5), the closing body (7, 40) of said valve being activated by the media separation element (2). According to the invention, the closing body (7, 40) can be moved by means of the media separation element (2 or 16) into a position in which it performs the function of a hydraulic piston. This prevents the bottom valve from being damaged and any unwanted leakage of the liquid, hereby considerably increasing the functional reliability.
Abstract:
본 발명은 피스톤 압력 어큐뮬레이터(1) 내 피스톤(5)의 위치를 검출하기 위한 방법 및 상응하게 설계된 피스톤 압력 어큐뮬레이터(1)에 관한 것이다. 하우징(3) 내에는 변위 가능한 피스톤(5)이 존재한다. 상기 도전성 하우징(3)에는 복수의 4점 측정 전극쌍(17)을 포함하는 전극 장치(15)가 제공되며, 이 전극 장치는 외측 전극(19)에 전류가 인가되면 하우징(3)을 따라 놓인 위치를 토대로 내측 전극들(21) 사이의 전기 저항 분포 또는 전위 분포를 측정하여 하우징(3) 내 피스톤(5)의 위치를 검출하도록 형성된다. 측정된 전위 분포에 근거하여 검출된 피스톤 위치는 피스톤 압력 어큐뮬레이터(1)의 충전 상태를 검출하거나 검사하는 데 사용될 수 있다.
Abstract:
PURPOSE: An accumulator is provided to maintain the constant internal pressure of a cylinder by controlling the position of a detecting part with a detector control part according to the changed internal pressure of the cylinder. CONSTITUTION: An accumulator(10) comprises a cylinder(30), a piston(50), a piston rod(55), a detector(70), and a detector control part(100). The piston is arranged inside the cylinder. The piston rod is coupled to one side of the piston. The detector detects the operation range of the piston rod to detect the position of the piston rod. The detector control part is coupled to the detector and moves the detector within the operation range of the piston rod according to the internal pressure of the cylinder.
Abstract:
A hydraulic turbine valve control device is provided to need no additional relief/unloading valves required for conventional fixed capacity type hydraulic pump, and to reduce the volume of the device by applying a variable capacity hydraulic pump of a plunger type. A hydraulic turbine valve control device comprises an oil tank(12), an oil cooler(14), a variable capacity hydraulic pump(10), a safety valve, a servo valve, a servo cylinder(30), an accumulator(32) and dumping and pressure reducing valves. The oil tank receives operating fluid. The oil cooler is installed inside the oil tank so as to cool the operating fluid. The variable capacity hydraulic pump is installed in an oil tank, and pressurizes the operating fluid and discharges the operating fluid to the outside. The safety valve is intermittently operated only when abnormal pressure is generated in a system. The servo valve controls a transfer passage, flow amount and pressure of the operating fluid. The servo cylinder controls opening and closing of a turbine valve. The accumulator is disposed on a pipe path branched from a pipe path connecting the hydraulic pump and the servo valve. The dumping and pressure reducing valves are respectively disposed on a return pipe path and a plurality of branch pipe paths.
Abstract:
Ein hydropneumatischer Kolbenspeicher, mit einem Speichergehäuse (1), das ein eine Längsachse (11) definierendes Zylinderrohr (3) aufweist, das an beiden Enden durch jeweils einen Gehäusedeckel (5,7) geschlossen ist und in dem ein Kolben (9) längsverfahrbar ist, der im Gehäuse einen Arbeitsraum (13) für ein kompressibles Medium, wie ein Arbeitsgas, von einem Arbeitsraum für ein inkompressibles Medium, wie Hydrauliköl, trennt, und mit einer die Position des Kolbens (9) im Gehäuse berührungslos ermittelnden Wegmesseinrichtung, ist dadurch gekennzeichnet, dass die Wegmesseinrichtung ein nichtmagnetisches Messrohr (29) aufweist, das sich durch eine im Kolben (9) gebildete Durchführung (31) entlang der Längsachse (11) von einem Gehäusedeckel (5) zum anderen Gehäusedeckel (7) hin erstreckt und gegen den Innenraum des Gehäuses (1) abgedichtet ist, dass im Rohr (29) ein Positionsgeber (57) verschiebbar geführt ist, der durch zwischen ihm und dem Kolben (9) wirkende Magnetkraft im Messrohr (29) den Kolbenbewegungen nachfolgt, und dass an einem der Gehäusedeckel (5, 7) ein Sender/Empfänger (65) der Wegmesseinrichtung angeordnet ist, der durch das betreffende offene Ende (25, 26) des Messrohres (29) hindurchtretende Messstrahlung zum Positionsgeber (57) aussendet und von diesem reflektierte Strahlung empfängt.