EP 0040976 A1 19811202 - Rotary actuators.
Title (en)
Rotary actuators.
Title (de)
Drehantriebe.
Title (fr)
Vérin rotatif.
Publication
Application
Priority
GB 8017273 A 19800527
Abstract (en)
A piston-rack rotary fluid pressure actuator includes a housing [10] enclosing cylinder [11] in which is disposed a pair of pistons [12, 13] biased by springs [14 and 15] towards the centre of the cylinder. Each piston has a rack portion [16, 17] engaged with a pinion [19] on output shaft [18], and elements of low friction material [20, 21] are incorporated into the outer surface of the rack portions [16, 17] to take up forces tending to displace the rack-bearing portions towards the cylinder. Annuli [30, 31] of incompressible material keyed to the shaft [18] make rolling contact with runways [32, 33] on the rack-bearing portions and have diameters equal to that of the pitch circle diameter of the teeth of pinion [19]. By this means contact is maintained between the low-friction elements [20, 21] and the cylinder and over-meshing between the teeth of pinion [19] and racks [16, 17] is prevented.
IPC 1-7
IPC 8 full level
F15B 15/06 (2006.01); F15B 15/08 (2006.01)
CPC (source: EP)
F15B 15/065 (2013.01)
Citation (search report)
- US 4167897 A 19790918 - BUNYARD ALAN D
- DE 2647385 A1 19770505 - GRIESEL BV
Designated contracting state (EPC)
AT BE CH DE FR IT LI LU NL SE
DOCDB simple family (publication)
EP 0040976 A1 19811202; AU 7091581 A 19811203; ES 502492 A0 19821201; ES 8301525 A1 19821201; GB 2077355 A 19811216; JP S57103915 A 19820628; ZA 813367 B 19820728
DOCDB simple family (application)
EP 81302295 A 19810522; AU 7091581 A 19810521; ES 502492 A 19810526; GB 8017273 A 19800527; JP 7944181 A 19810527; ZA 813367 A 19810520