Patent GB-1144062-A (GB)
Title: Mounting assemblies
IPC: F16D27/06
Filed: 1966-04-06
Abstract: 1,144,062. Resilient couplings; friction clutches. BORG-WARNER CORP. 6 April, 1966 [2 July, 1965], No. 15405/66. Headings F2C and F2U. In a resilient flexible connection, particularly between a shaft, such as 19, and a driven or rotatable element, such as 36, of an electromagnetic clutch or brake, wherein rubber blocks 78 are interposed between interdigitating substantially radial teeth 66, 68 extending from inner and outer hub members 51, 50 fast with the shaft and element respectively, resilient means independent of said blocks normally axially bias the hub members relative to each other. As shown, the element 36 is the driven ferromagnetic plate of an electromagnetic clutch, the driving ferromagnetic element 14 of which carries a coil 40 energized through a collector ring and brush assembly 41 and has secured thereto a sheet metal pulley 15 receiving a driving V- belt 16. The shaft 19 is the driving shaft of an automotive airconditioner compressor and extends into the extension 20a of the compressor housing 20. The driving element 14 is journalled on the extension 20a by a ball bearing 23. A pole ring 35, nested between driving element leg portions 31, 33 and carried by the portion 33, defines a flux path H-1 in co-operation with the plate 36 which has arcuate slots 38. The plate 36 has an octagonal bore 37 fitting a complementary shaped boss of the outer hub member 50 and is secured by coldworking deformation 53. The bore 54 of the inner hub member 51 has flats fitting complementary flats (19c) of the shaft 19, the member 51 being secured by a stud (56). The plate 36 and outer hub member 50 are leftwardly urged to the clutch-disengaged position by a Belleville washer or, as shown, a low hysteresis, low spring rate, long travel, wavy spring washer 77 which is held by a retainer 63 and washer fingers 87 engaging an inner hub member recess 59. Conical faces 61, 62 respectively of the inner and outer hub members are engageable for positive concentric alignment in the clutch disengaged position only. The blocks 78 engage chordally disposed faces 73, 74 of the teeth 66, 68. For reverse rotation, additional, thinner, blocks 83 may be disposed between faces 71, 72 of the teeth 66, 68. Each block 78 has integrally moulded gently rounded axial ridges 80, to space the blocks from the teeth faces 73, 74, and triangular section ridges 81 spacing the blocks radially. Internal openings (82) in the blocks accommodate internal shape changes. In operation, in the non-driving and driving conditions the blocks 78 occupy substantially 80-90% and 95% respectively of the available space in the cavities between the teeth 66, 68. With residual flexure and space available during drive, the blocks can absorb torsional fluctuation and eccentricities during both axial clutch travel to, and in, the drive condition. In the alternative embodiment of Fig. 13 (not shown), the V-belt pulley is integral with the clutch driving element; a pole ring is connected to the driving element by swaging; set-screw load-adjustable coil compression springs are provided for clutch disengagement; and the rubber blocks (Fig. 11, not shown) have flat driving faces and pointed faces for spacing radially.