Patent GB-442330-A (GB)
Title: Improvements in combined hydraulic transmission and change speed devices
IPC: F16H47/08
Filed: 1934-07-05
Abstract: 442,330. Variable-speed gearing. LAVAUD, D. S. DE, 82, Rue de la JonquiÛre, Paris. July 5, 1934, No. 7839/35. Convention date, July 8, 1933. Divided out of 441,381, [Group XXIX]. [Class 80 (ii)] A constant-mesh change-speed device is combined with a hydraulic transmission gear. The hydraulic gear, of the type described in Specification 441,381, comprises a pump 1 fixed on a driving shaft 2, a turbine 3 coaxial with the pump, and a torque converter ring 4 provided with vanes and connected to the frame 36 by means permitting rotation of the ring only in the direction of rotation of the pump and turbine. The ring, turbine and pump form a closed eircuit for the fluid in the device which includes small balanced tongues 82 pivoted on pivots 83 on the' shell of ring 4 and adapted to contact with ratchet teeth 84 on a drum 85 fixed to a sleeve 86 and casing 36. The turbine 3 is keyed to an intermediate shaft 5 rigid with a plate 7 of a carrier 6, pins 11 in which carry groups of integral pinions 8, 9, 10. Pinions 8 mesh with a sun-wheel 12 rigid with one end of a driven shaft 13, Pinions 9 mesh with a sunwheel 15 rigid with a sleeve 16 to which the hub 18 of a disc 17 is slidably keyed. Pinions 10 mesh with a sun-wheel 24a at the end of a sleeve 24. The disc 17 has projections 20 near its periphery adapted to engage recesses both in the side 7<a> of the carrier, and in a disc 23 slidably mounted on the sleeve 24. The discs 23, 17 have teeth 25, 28 respectively engaging internal teeth on rings 29, 26 adapted to be held stationary for speed changes by being pressed against walls 53, 54. Springs 30, 31 tend to disengage the projections and recesses and free the disc 17. On the hub 18 is fixed the internal race 52<a> of a ball bearing, the outer race being fixed in the bore of a ring 32 capable of rotary and axial displacement to engage or release the disc 17 from the members 7<a>, 23 on either side of it. The ring 32, Fig. 3, is moved axially by rotating it, by a cam 39 on a shaft 44, against the action of a spring 40. A number of short ball-ended rods 34 are located in an inclined direction between the ring and a fixed ring 35, Figs. 1, 3. Rotation of the ring varies the inclination of the rods and produces axial movement. The shaft 44 is actuated by an arm 48, Figs. 1, 4, through a ratchet, each displacement of which corresponds to a high or a low part of the cam and therefore disengagement or engagement of the members 6, 17, 23. The rings 26, 29 are adapted to be held against the walls 53, 54 by rings 55, 57, Fig. 1, which on being rotated slightly are forced away from a fixed ring 56 by balls 60 and wedge surfaces 58, 59, Fig. 6. The rings are rotated as shown in Fig. 2. The rings have projections 64 adapted to be engaged by spring-loaded rods 65, and by rods 63 bearing against cams 61, 62, Figs. 2, 4, mounted on the shaft 44 of Fig. 3. The cams are similar in shape and so disposed that one has its highest while the other has its lowest part opposite the rods 63 and each cam has the same number of highest and lowest parts as the cam 39. The actual holding of the discs is performed by springs 66, and the release by the cams permitting movement of the rods 63. The cams have each a cylindrical portion 61<a>, 62<a>, Fig. 4, and they may be moved axially so as to be put out of action by means of an eccentric finger 68, Fig. 2, adapted to be rotated by a pulley 72 and wire 73, a detent being provided at 74. With the cams out of action, a direct drive is produced, and from this position the cams may be moved to give a geared-down forward drive or a reverse drive. With the cylindrical parts of the cams opposite the rods 63, the ring 32 is moved to engage the members 6, 17, 23 for direct drive. For forward geareddown drive, the cams are moved in direction of arrow 97, Fig. 4, and the lever 48 actuated to move shaft 44 through a quarter of a revolution. This disconnects members 6, 17, 23 and holds the ring 26. For reverse drive, cam 39 is brought to position in Fig. 3, the cams 61, 62 are moved to the left, Fig. 4, and lever 48 actuated as before. This disconnects members 6, 17, 23 and locks the ring 29 and sun-wheel 15.