Patent GB-1156837-A (GB)
Title: An Arrangement for Sealing an Annular Gap Between a Pair of Relatively Rotatable or Partially Rotatable Members in an Hydraulic Rotary or Semi-Rotary Motor.
Inventor: SNEEN FRANZ
IPC: F01C19/08
Filed: 1966-09-05
Abstract: 1,156,837. Hydraulic rotary motors. F. SNEEN. Sept. 5, 1966 [May 27, 1966], No. 39574/66. Heading F1F. In a hydraulic rotary motor, a vaned rotor 1 has at either end thereof, an annular endpiece 9 of tapering configeration, a gap between the inclined surface 10 of each end-piece and a casing 2 for the rotor being sealed by a ring 3, which is made of an elastomeric material and pressed against the surface aforesaid by the pressure of a fluid exerted upon an O-ring 7 through a passage 11 communicating with an annular groove or recess 5 wherein the rings 3, 7 are lodged. The rings 3, 7 are separated from each other by a rigid ring 40; and the lip 4 of the ring 3 is tapered to match the inclination of the surface 10. The passage 11 is connected to a pair of ducts (14, Fig. 1 not shown), through non-return valves (13), which ducts convey working fluid to and from the working spaces of the motor, the said valves being furnished to permit reversal of the motor. In a second embodiment, Fig. 4 (not shown), the ring 3 is replaced by a ring (3<SP>1</SP>) that is made of hard material e. g. bearing metal, having a low coefficient of friction, said ring being pressed against the surface 10 by the pressure of a fluid applied to a ring (8) occupying the place of the rings 7, 40 and having a V-shaped profile in cross-section. In a third embodiment, Fig. 5 (not shown), the motor has radial vanes (18) lodged in a rotatable casing and a non-rotatable inner-part (1) with an annular groove (17) whose walls are engaged by said vanes, said groove being divided into two spaces by walls or shoulders fixed to the inner part in diametrically opposite positions, and each end of the inner part being furnished with an axially tapering surface (19) that is engaged by the tapering lip 4 of a sealing ring (3<SP>11</SP>) made of an elastomeric material so as to seal a gap between said surface and a tapering annular surface (24) on an end-piece (23) upon a central portion of the casing. The ring (3<SP>11</SP>) is situated in an annular space or recess (5<SP>11</SP>) between the inner part and a flanged ring (27) on the latter, the ring (3<SP>11</SP>) being pressed against the surfaces (19, 24) by the pressure of a fluid exerted upon an O-ring (7) through passages (11<SP>11</SP>) in the inner part. Rigid ring-segments (40) are lodged between the rings (3<SP>11</SP>, 7) within the space (5<SP>11</SP>). In a fourth embodiment, Figs. 6, 7 and 8 (not shown), the motor is of the oscillating vane or semi-rotary type, two pairs of diametrallyopposed vanes (43, 44) being fixed to an inner member (41) and a rotatable casing (42), respectively, and a sealing ring (3a) made of an anti-friction material being pressed against a chamfer (53) at either end of the inner member by the pressure of a proportion of the working fluid entering an annular space or recess (5a) wherein the ring is lodged together with an O-ring (7). The said proportion of working fluid enters the space (5a) from the working spaces through a non- return valve (13), the space being defined by an end (49) of the casing and a bearing sleeve (50) for a journal (47) on the inner part. A draining passage (57) in the casing communicates with an annular groove (55) adjacent the space (5a) and a plurality of radial passages (56) in a portion (54) of the ring (3a) that has a reduced thickness to facilitate the escape of leakage fluid. A fifth embodiment, Fig. 9 (not shown), differs from the fourth one, only in that the ring 3a is replaced by a ring (3b ) made of an elastomeric material and separated from the ring (7) by a ring (40b), which may be divided into a plurality of segments, an additional draining passage (61) being formed in a flange (60) on the bearing sleeve (50). In a sixth embodiment, Figs. 10 and 11 (not shown), the inner member (41) aforesaid has a sealing ring (3c) made of elastomeric material at either end thereof lodged in an annular groove or recess (5c) and engaging with both a tapered flange (66) on the end (49) of the casing and a tapering surface on the adjacent bearing sleeve (50), the ring (3c) being of V-shaped profile in cross-section and pressed against the flange and the bearing sleeve by the pressure of a proportion of the working fluid entering the groove (5c) through a passage (11c) in the member (41). In a seventh embodiment, Fig. 12 (not shown), the motor is of the type referred to in respect of the fourth embodiment and the inner member (41) has at either end thereof a tapered sealing ring (3d) lodged together with an O-ring (7d), in an annular space or channel (5d) between rings (69, 70) fixed to the journal (47), the ring (3d) being pressed against the end (49) of the casing by the pressure of a proportion of the working fluid entering said space through passages (11d) in the journal.