-
公开(公告)号：EP1232335A1
公开(公告)日：2002-08-21
申请号：EP00981162.1
申请日：2000-11-06
CPC分类号： F01B11/007 , F02B71/045 , F02B2075/025
摘要： A free-piston engine is disclosed, whose engine piston may have a force applied, in the compression direction, by means of an hydraulic cylinder, which can, by means of a switching valve, be connected to the pressure in a high pressure storage device or a low pressure storage device. According to the invention, a valve arrangement, with a control piston, is arranged between the hydraulic cylinder and the switching valve, whose control surface controls a connection with the high pressure reservoir device.
-
2.发明公开HYDRAULISCHE STEUERANORDNUNG FÜR EINE MOBILE ARBEITSMASCHINE, INSBESONDERE FÜR EINEN RADLADER, ZUR DÄMPFUNG VON NICKSCHWINGUNGEN 审中-公开液压控制装置，用于移动工作机，尤其是用于装载机，用于缓冲VIBRATIONS NICK
公开(公告)号：EP1038070A1
公开(公告)日：2000-09-27
申请号：EP98963493.6
申请日：1998-11-21
发明人： FERTIG, Günter , RAUSCH, Georg
IPC分类号： E02F9/22
CPC分类号： E02F9/2267 , E02F9/2207 , E02F9/2217 , E02F9/2271 , F15B1/021
摘要： The invention relates to a hydraulic control mechanism for a mobile machine tool, especially a wheel loader, for damping longitudinal oscillations. The inventive hydraulic control mechanism comprises at least one hydraulic cylinder (12) which helps to move a working tool, a directional control valve (11) for controlling the paths of the hydraulic fluid between a pressure chamber (15) of the hydraulic cylinder (12), a source of hydraulic fluid and a tank (27), and a hydraulic accumulator (21) which can be connected to a source of hydraulic fluid by means of a filling valve (22; 71) located in a filling line (20), whose charge pressure can be increased to a maximum pressure by means of said filling valve (22; 71) and which can be connected to the pressure chamber (15) of the hydraulic cylinder (12) in order to dampen the longitudinal oscillations. The inventive mechanism also has a shut-off valve (22; 75) which can be moved into a through position in which hydraulic fluid can flow through from the hydraulic accumulator (21) to the pressure chamber (15) of the hydraulic cylinder (12) and vice versa, when a first condition is fulfilled. According to the invention, the shut-off valve (22; 75) can also be moved into its shut-off position when the first condition is fulfilled in the event that the charge pressure in the pressure chamber (15) of the hydraulic cylinder (12) or the accumulator pressure reaches a maximum pressure.
-
公开(公告)号：EP0785861B1
公开(公告)日：1998-05-20
申请号：EP95932738.8
申请日：1995-09-12
发明人： SCHMIDT, Stefan
IPC分类号： B30B15/16
CPC分类号： F16H61/4096 , B30B15/16 , B30B15/161 , B30B15/163 , F15B3/00 , F15B7/003 , F15B21/14
摘要： The invention relates to a drive system for a hydraulic press. The drive system is designed as a secondarily regulated system in which there is a hydraulic transformer (6, 7) consisting of two mechanically coupled hydrostatic machines (6, 7), each with adjustable intake and delivery volumes. The first machine (6) is connected to a pressure system (3, 4) with a constant or imposed pressure and the second (7) is connected to the pressure cylinder (16). According to the invention, the drive system is designed in such a way that the prestress on the pressure cylinder (16) and the process in fast motion and pressure stroke, the decompression of the pressure cylinder and the rinsing of hot working medium in the closed circuit takes place without any choke losses or power is recovered via the hydraulic transformer.
-
公开(公告)号：EP0817730A1
公开(公告)日：1998-01-14
申请号：EP96902236.0
申请日：1996-02-16
发明人： MIES, Hubertus
CPC分类号： G05G5/03 , B60T13/58 , B60W10/06 , B60W10/18 , B60W30/18063 , B60W2300/12 , B60W2540/12 , B60W2710/182
摘要： Disclosed is an inching brake system for a working device, in particular a utility vehicle such as a wheeled loader, the brake system having a drive unit (50, 102), a brake unit (110, 103) and an actuator (2, 24), the drive unit (50, 102) and the brake unit (110, 103) being controlled, using the actuator (2, 24) to decelerate the vehicle. This deceleration is produced in a first zone (I) initially by appropriate control of the drive unit (50, 102) and in a second zone (II) jointly by the drive unit (50, 102) and the brake unit (110, 103). In order to make the two zones recognizable on the actuator (2, 24) to the operator, the brake system is fitted with a pressure-point device (12) by means of which one or more pressure points can be simulated which indicate the transition to the different braking zones (I, II).
-
公开(公告)号：EP0815362A1
公开(公告)日：1998-01-07
申请号：EP96904847.0
申请日：1996-02-22
CPC分类号： F16K27/02 , F15B13/0405 , Y10T137/7668 , Y10T137/7782
摘要： The invention relates to a two-way insert valve with an insert assembly which can be fitted in a drilling and a valve cover to close said drilling. The insert assembly has a two-piece bush with several radial passages and a small axial passage and a ring fitted between the bush and the valve cover, and a valve piston by means of which a connection between the radial and axial passages can be controlled and which can be pushed as far as a stop in the opening direction. The valve piston is loaded in the closing direction by a closing spring. According to the invention, in its closed position the valve piston is taken at least approximately as far as the first face of the bush facing the ring by the bush. The guidance between the valve piston and the bush, the quality of which is essentially determined by the ratio between the guide distance and the guide diameter, is thus still sufficiently good if the radial passages through the bush and the diameter of the valve piston are very large in order to obtain large aperture cross-sections of the valve and hence low flow resistance.
-
公开(公告)号：EP0807212A2
公开(公告)日：1997-11-19
申请号：EP96901186.0
申请日：1996-01-31
摘要： The description relates to a device for actuating a hydrostatic drive (1) with a periodically operable on-off valve (2) which connects a resonant pipe (4) connected to the hydrostatic drive (1) to generate standing pressure waves in the hydraulic medium alternately to a pressure supply line (5) and a return line (6). In order to create favourable control conditions it is proposed that the resonant pipe (4) have a pressure outlet (7) at an oscillation node of the standing pressure waves and the switching times of the on-off valve (2) be controllable at a constant switching frequency.
-
公开(公告)号：EP0804696A1
公开(公告)日：1997-11-05
申请号：EP95942199.0
申请日：1995-12-23
发明人： WÖLFGES, Hans
IPC分类号： F16K17
CPC分类号： F16K17/105 , F16K17/0433 , Y10T137/87209
摘要： In a pilot operated proportional pressure limitation valve (101), damping nozzle elements (74, 78, 72) with variable hydraulic resistance are used to prevent vibration of the valve where there are small flow rates and high pressures and thus small strokes of the main piston (16).
-
公开(公告)号：EP0797727A1
公开(公告)日：1997-10-01
申请号：EP95904468.0
申请日：1994-12-14
发明人： EISENBACHER, Egon
CPC分类号： B62D5/07 , F01P5/043 , F01P7/044 , F15B11/16 , F15B2211/3127 , F15B2211/40515 , F15B2211/41509 , F15B2211/45 , F15B2211/50518 , F15B2211/5151 , F15B2211/5157 , F15B2211/62 , F15B2211/632 , F15B2211/634 , F15B2211/7054 , F15B2211/7058
摘要： The invention starts from a hydraulic system for a motor vehicle and comprises the following elements: a hydraulic pump (10) which has a hydraulic steering device (21) comprising a steering motor (26) and a steering valve (25) which can move from an intermediate position in opposing directions and by which hydraulic fluid lines to and from the steering motor (26) can be controlled; a ventilator motor (17) which is circumvented by a bypass line and fitted in series with the steering device (21) between the latter and the hydraulic pump (10); and a bypass valve (32, 33) with which the distribution of fluid flow through the ventilator motor (17) and the bypass line (31) can be adjusted in accordance with the cooling power required. The aim is to achieve a particularly inexpensive design for a hydraulic system of this type. This is achieved by the feature according to which the bypass valve (32, 33) can be adjusted to allow more hydraulic fluid to flow through the bypass line (31) during actuation of the steering valve (25). This makes it possible to keep the system pressure low and thus to use a simple and inexpensive hydraulic pump (10). No additional valves are required.
-
公开(公告)号：EP0785345A1
公开(公告)日：1997-07-23
申请号：EP96116019.9
申请日：1996-10-07
发明人： Rüb, Winfried
CPC分类号： F01P7/044 , F01P7/16 , F01P2025/50 , F01P2070/08
摘要： Offenbart ist eine Meßfühlerschaltung und ein Pilotsummenventil sowie ein vorgesteuertes Druckventil für eine derartige Meßfühlerschaltung bei der eine Vielzahl von Sensorelementen (8) über eine Sammelleitung (10) an ein gemeinsames Summenventil (12) angeschlossen werden, dessen Ausgangssignal als Steuersignal für ein Druckventil (14) verwendet wird, über das ein Verbraucher (6) in Abhängigkeit vom Ausgangssignal der Sensorelemente (8) angesteuert wird.
摘要翻译： 控制系统具有多个传感器，通过改变音量来响应温度变化。 相加的体积变化（Xs）被液压地传递到调节器（12），调节器（12）控制从泵（6）向风扇马达（4）供应油的优先阀（14），从而调节冷却风扇的输出。 温度上升导致传感器体积增加，其使调节器活塞（52）和阀（60）抵抗弹簧（58,62）移动。 它减少油泄漏到罐（T），引起压力增加，其有助于弹簧（64）移动优先阀活塞（68），从而减少旁路流量（B）并将油流量（A）增加到 ，以及由风扇电机开发的电力。 调节器和优先阀可以分开或共用单元。
-
公开(公告)号：EP0746690A1
公开(公告)日：1996-12-11
申请号：EP95909750.0
申请日：1995-02-21
发明人： HARNISCHFEGER, Edwin
IPC分类号： F15B11
CPC分类号： F15B11/165 , F15B2211/20553 , F15B2211/30525 , F15B2211/3144 , F15B2211/31511 , F15B2211/329 , F15B2211/355 , F15B2211/605 , F15B2211/67 , F15B2211/71
摘要： A control system for a variable-displacement hydraulic pump having an adjustment device and being electrical current-adjustable as required for supplying pressure to a first hydraulic apparatus (13), and pressure-adjustable for supplying pressure to a second hydraulic apparatus (14), in which case the pressure rating and the setting of the pilot valve controlled by the second hydraulic apparatus (14) may be programmed by a control signal. The control system includes a first control valve (18) that can be actuated by the weight of the load of the first apparatus (13) and by a spring (23) when switching to a higher displacement, or by the pump pressure when switching to a lower displacement. The system further includes a second control valve (19) which can be exposed to a force corresponding to the control signal (25) when switching to a higher displacement, or to the pump pressure when switching to a lower displacement.
摘要翻译： 1。一种可变容量型液压泵的控制装置，其特征在于，具有调节装置，能够根据需要向第一液压装置（13）供给压力而进行电流调节，并且能够对第二液压装置（14） 在这种情况下，压力等级和由第二液压设备（14）控制的导阀的设定可以通过控制信号来编程。 该控制系统包括第一控制阀（18），该第一控制阀能够通过第一装置（13）的负载的重量而被致动，并且在切换到较高排量时通过弹簧（23）或者在切换到 较低的排量。 该系统还包括第二控制阀（19），当切换到较高排量时，该第二控制阀可以暴露于对应于控制信号（25）的力，或者当切换到较低排量时暴露于泵压力。
-
-
-
-
-
-
-
-
-
搜索结果
115 条记录 (耗时 0.02 秒)
