GB885075A - Improved method of and apparatus for testing ring seals - Google Patents

Abstract

885,075. Testing shaft sealing rings. GENERAL MOTORS CORPORATION. Sept. 25, 1959 [Nov. 10, 1958], No. 32668/59. Class 122 (5). [Also in Group XIX] A shaft sealing ring 10 is tested prior to installation by holding it in fixed relation on a stub shaft 26 of predetermined diameter, supplying air under pressure to one side of the ring, and measuring the air flow between the ring and the shaft; the ring being accepted or rejected according to the rate of air flow. The stub shaft 26 is secured to a piston 24 (Fig. 4) in a chamber 20 and the sealing ring 10 is held in a recess 16 in a collar 14, concentric with the shaft, by a perforated cup 28. Compressed air is supplied to the space 18 beneath the ring 10 through a pipe 30, pressure regulator 32, pipe 34, flowmeter 40, pipe 42 and a passage 44 in the wall of chamber 20. Air passing between the shaft 26 and the ring 10 escapes to atmosphere through the perforations 159 in cup 28. The air pressure is recorded by a gauge 36. In the apparatus shown in Fig. 2, the stub shaft 26 has two different diameter parts 56 and 58 and the shaft 26 is movable to bring either part 56 or 58 into engagement with the ring 10 by a rack 130, rotatable by mechanical means (not shown), meshing with a rack 134 on the piston 54. The cup 28 is connected to one end of a pivoted beam 76 connected at its other end to the piston rod 66 of a compressed-air-actuated piston and cylinder 62. Air is supplied to the space 18 through pipe 114, pressure regulator 110, pipe 120, flowmeter 40, pipe 122 and passage 124. The ring is tested on each part 56, 58 in turn. In a modified apparatus, Figs. 5 and 6 (not shown), two separate stub shafts of different diameters are used, each stub shaft being associated with its own sealing ring holding gear and testing equipment.