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公开(公告)号：EP0770193A1
公开(公告)日：1997-05-02
申请号：EP95925058.0
申请日：1995-07-14
CPC分类号： F16H25/2018 , F16H25/2204 , F16H2025/2065 , F16H2025/2068 , F16H2025/2075 , F16H2025/2081 , F16K31/047 , G01N2800/52 , Y10T74/18608 , Y10T74/1864
摘要： The linear actuator comprises an output shaft (4) having a pair of driven wheels (6, 8), one (8) being rotatable thereon in a fixed plane and having a drive nut (9) for an associated thread (11) on said output shaft and the other (6) being rotatably fixed (6A) to said output shaft, an input shaft (2) alongside the output shaft which is rotated by a suitable power source (3) and a drive wheel (5, 7) for each driven wheel rotatably fixed on said input shaft, the ratio between each drive and driven wheel set being chosen to rotate the driven wheels at different speeds in the same rotational direction to produce axial movement of said output shaft in a direction depending upon relative rotation of the driven wheels. In accordance with the invention the fixed driven wheel (6) and drive wheel (5) are meshing helical gear wheels, and a fail-safe arrangement is provided comprising a clutch (27, 29) between the drive wheels (5, 7) of the input shaft, a back-drive (9, 11) for said output shaft, and biasing means (22) for effecting a back-drive. In operation the meshing helical gears impart an axial force to engage the clutch only while power is supplied, the biasing means being operative to back-drive the output shaft to a fail-safe position when the power is terminated. The actuator can be readily modified to be operated by a remote operating vehicle (ROV) in undersea applications.
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公开(公告)号：EP2038713A2
公开(公告)日：2009-03-25
申请号：EP07766167.6
申请日：2007-07-09
IPC分类号： G05B19/39
CPC分类号： G05B19/39 , Y10T137/8242
摘要： A valve actuator having an electric drive motor with a motor shaft and having an output shaft linked to the motor shaft to drive movement of a valve, the actuator further having a control system arranged to provide a first closed loop control of the actuator output shaft and including a controller coupled to a first position sensor to sense the position of the actuator output shaft, and to a second position sensor to sense the position of the motor shaft and to enable determination of the speed of the motor shaft, the control system being configured to respond to sensed signals from the first and second sensors and adjust the motor speed/position accordingly.
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公开(公告)号：EP0770193B1
公开(公告)日：1998-06-24
申请号：EP95925058.0
申请日：1995-07-14
IPC分类号： F16H25/20
CPC分类号： F16H25/2018 , F16H25/2204 , F16H2025/2065 , F16H2025/2068 , F16H2025/2075 , F16H2025/2081 , F16K31/047 , G01N2800/52 , Y10T74/18608 , Y10T74/1864
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公开(公告)号：EP1784620A1
公开(公告)日：2007-05-16
申请号：EP05762893.5
申请日：2005-07-26
CPC分类号： G01D5/145 , G01D5/34738
摘要： The present invention provides in a first aspect an absolute shaft encoder to measure both the angular position of a shaft from a given radial axis and simultaneously or in sequence to record the number of completed rotations of the shaft passing through a given radial datum axis, the encoder consisting of a fist wheel and signal pick up means such that rotation of the wheel generates unique incremental signals defining the number of sectors of the wheel which have passed over a given radial datum position such that the radial position of the shaft can be recorded and displayed and actions initiated; at least a second wheel which, in use, provides further unique position signals from at least a further signal pick up means; an indexing mechanism to operate between the said first and second wheels and arranged such that each operation of the indexing device rotates the second wheel through an angle equal to the angle subtended by each sector at the wheel centre wherein, the first wheel is arranged to operate the indexing mechanism whereby for every completed turn of the first wheel the second wheel is indexed two or more times providing two or more position signals to the second wheel’s pick up device.
摘要翻译： 本发明在第一方面提供一种绝对轴编码器，用于测量来自给定径向轴的轴的角位置并且同时或顺序地记录穿过给定径向基准轴的轴的完成旋转的次数，所述 由第一轮和信号拾取装置组成的编码器，使得轮的旋转产生唯一的增量信号，该增量信号限定已经通过给定的径向基准位置的轮的扇区的数量，使得可以记录轴的径向位置并且 显示并采取行动; 至少一个第二轮，其在使用中从至少另一个信号拾取装置提供另外的独特位置信号; 分度机构，所述分度机构在所述第一轮和第二轮之间操作并且布置成使得所述分度装置的每个操作使所述第二轮旋转一个角度，所述角度等于所述轮中心处的每个扇区所对的角度，其中，所述第一轮布置成操作 索引机构，其中对于第一轮的每完成一圈，第二轮被索引两次或更多次，从而向第二轮拾取装置提供两个或更多个位置信号。
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