Patent GB-909088-A (GB)
Title: Improvements in or relating to rotary apparatus
IPC: F04C15/06
Filed: 1958-10-17
Abstract: 909,088. Compressors; reciprocating pumps. EICKMANN, K. Oct. 17, 1958 [Oct. 19, 1957; Dec. 31, 1957], No. 13373/62. Divided out of 903,037. Classes 8(1) and 102(1). [Also in Groups XXVI and XXIX] In a hydraulic or pneumatic rotary machine comprising a rotor mounted on a non-rotating control pintle having passages for the flow of fluid to and from the rotor, the pintle is connected to the machine casing by means of a universal joint permitting axial sliding movement of the pintle to follow irregular rotor movements whilst preventing rotation about its own axis and having at least one passage sealed from the interior of the machine casing by sealing means including a ring coaxial of the pintle having plane and part-spherical surfaces on opposite faces sealingly engaging complementary surfaces on adjacent members. As shown in Fig. 1, the rotor 26 of an oil motor is mounted on a pintle 1 having pressure and discharge passages 2, 3. The pintle is formed with a flange 1a having a part-spherical surface 15 sealingly engageable with a complementary surface on a sealing ring 10 having an opposite plane surface 11 sealingly engaging a plane face 14 on a housing 13 bolted to the motor casing 25. A universal joint comprising a ring 18, Fig. 2, having diametrically opposite holes 19 through which pass pins 16 secured to the pintle and diametrically opposite dovetail grooves into which fit slide rails 29 engaging with clearance pins 17 secured to the housing 13 connects the pintle to the housing to permit limited axial and radial movement of the pintle. Pressure oil admitted through an inlet 23 together with.a spring 20 act on the pintle to urge the flange 1a, ring 10 and housing 13 into sealing engagement with one another to seal the interior. 28 of the motor casing from the passage 2. Recesses 4, 5, 6, 7 on the pintle periphery communicate with the passages 2, 3, to provide a " floating " condition of the rotor with respect to the pintle and lubrication of these parts. In a modification, in which the machine operates as a pump, the sealing ring with its plane and part-spherical surfaces and the pintle flange are located between the inlet 23 and the universal joint and the spring 20 between the universal joint and the face 14 on the housing 13. The passage 3 is now the pump discharge passage and the high pressure liquid therein acts on the partition between the passages 2, 3, and together with the spring effectively seals the casing against leakage. As applied to a revolving cylinder pump, comprising a rotatable cylinder block 100, Fig. 7, having a plurality of radial bores slidably mounting pump pistons 104 abutting at their outer ends an eccentrically mounted anti-friction bearing 105, the pintle 148 formed with a part-spherical end 167 abutting a complementary surface on the cylinder block is connected to the housing 102 by a universal joint. The joint comprises pins 114 secured to the pintle and passing through a ring 115 and pins 178 secured to a housing part 108 and extending into grooves in slide rails 180 fitting dove-tail grooves in the ring 115 to permit both slight radial and axial movement of the pintle. Fluid connections 122 and 137 are sealed from each other and the housing 102 by sealing means each comprising part-spherical surfaced sleeves 119, 123 urged apart by a spring 120 into sealing engagement with sealing rings 117, 125. The rings 117, 125 in turn sealingly abut lining members 155, 127. The lining members fitted with packing rings 149 are held against axial movement by retaining rings 188, 129. Passages 150, 151 connected through chambers 120, 136 with the connections 122, 137 and sequentially connected through passages 109, 110 to the cylinder block are connected to a chamber 165 by passages 157, 158 fitted with non-return valves. The chamber 165 which is sealed from other parts of the casing by a partspherical surfaced sleeve 174, sealing ring 172 and lining member 170 communicates through a passage 183 with a pintle bore 177, so that bearing pressure betweeen the pintle and the cylinder block is sufficient to maintain an adequate seal therebetween and insufficient to cause. large friction losses. Specification 909,089 also is referred to.