Patent GB-529517-A (GB)
Title: Improvements in or relating to synchronizing change-speed gearings
IPC: F16D23/06
Filed: 1939-05-20
Abstract: 529,517. Positive clutches. BORG-WARNER CORPORATION. May 20, 1939, Nos. 15073 and 15074. Convention dates, May 31, 1938, and June 11, 1938. [Class 80 (ii)] In a friction-synchronized claw clutch for use in variable-speed gearing, the movable friction cone 25 is caused to partake in the initial axial engaging movement of the movable claw member 18 by reason of longitudinally-extending thrust members 35 which are solely in frictional contact with the interior surface of the member 18. In the double clutch shown in Figs. 1 and 2, wherein the double movable claw member 18 is splined on a hub 13 secured to the gear shaft 11, each cylindrical thrust member 35 is loosely mounted in a notch 36 in the hub so that, under the effect of its centrifugal force, it moves radially out of contact with the notch and into engagement with the corners 37a of a pair of the internal teeth 22 of the member 18, while the ends of the members 35 abut against the bottoms of elongated notches 38 in the rings 25 whereby each ring 25 may rotate through a limited angle relative to the hub. The corners 37a may be chamfered to the contour of the members 35. In the initial engaging movement of the member 18, the members 35 are frictionally carried along therewith and thrust the appropriate ring 25 into engagement with its co-operating cone sufficiently to cause the ring 25 to rotate to one of its limiting positions, in which teeth 29 thereon balk the teeth 22 of the member 18. Oil drag between the conical surface assists such action. Continued pressure on the member 18 advances it into contact with the ring 25 so as to increase the synchronizing action. When synchronism is reached, the ring 25 turns slightly so as to permit the member 18 to complete its movement. Alternatively, the members 35 may be mounted loosely in sockets in a hub which is splined on the shaft 11, thrust being transmitted to the appropriate ring 25 through the hub, while the limited rotation of the rings 25 is secured by the teeth 29 engaging in elongated notches in the member 18. In the form shown in Figs. 6 and 10, the members 35 are mounted loosely in semicylindrical notches 36 and 37 in the hub 13 and member 18, while their ends are received in elongated cam sockets 38 in the rings 25 and abut against the bottoms 42 of the sockets, the contour of the sockets being such that, when a ring 25 is rotated in either direction relative to the member 18, the members 35 are wedged outwardly into increased frictional engagement with the notches 37. During this wedging action, the members 35 become slightly tilted. One end of the members 35 may be urged outwards by a spring ring 45, while each member 35 may be formed of telescoped members 47 and 49, Fig. 12, urged apart by a light spring 50. The members 35, instead of being cylindrical, may be in the form of flat bars 35a, Fig. 13, provided with bevelled corners 54 co-operating with bevelled end faces 55 of sockets 38a in the rings 25 so that rotation of a ring 25 causes the faces 55 to exert a camming action on the bars tending to rotate them about their longitudinal axes into binding engagement with the teeth 22.