GB190910108A - Improvements relating to Change Speed Gear. - Google Patents

Abstract

10,108. Renault, L. April 28. Speed - varying mechanism.- H y d r a u l i c transmission-ofpower apparatus for use as a change-speed gear comprises a set of pumps arranged in a rotary cylindrical barrel and operated by swash - plate mechanism, forcing liquid to a similar device which is fixed, the whole being arranged in a casing free to rotate. A portion of the motive power is always transmitted through the casing to the driven shaft without passing through the hydraulic device. Fig. 1 shows one form of the apparatus. A flanged disk or c y l i n d e r body 1 is rotatably m o u n t e d on the driving-shaft 2, and is provided with cylinders 3, in which work pistons 4. These pistons are connected to an adjustably-inclined plate 6, which together with the disk 1 is carried round with the casing 9. The disk 6 is provided with rollers 10, which bear against ribs 11, and the disk is mounted on a collar 12 connected by a trunnion to the driving-shaft 2, the inclination of the collar being varied at will by means of a sleeve and link mechanism 26, 24, 22, 21. Springs 14 tend to press the disk 1 against the distributor 27, which is invariably fixed to the end of the driving-shaft 2. Orifices in the bottoms of the cylinders place them in communication with passages 28, 29, Fig. 3, which communicate with continuous grooves 30, 31. The distributor 27 is pressed against a second distributor 32 formed with grooves 33, 34 corresponding with the grooves 30, 31. These grooves are connected with passages 35, 36. A system of cylinders 37 similar to the cylinders 3 is formed in a disk which is held fixed by sleeves 39, 41, the latter being held fixed to a collar 42 rigidly connected to the frame 19. The pistons 45 are connected to an inclined plate 47, which is not free to rotate and is mounted in a ring 49, the position of which may be varied in a somewhat similar manner to the ring 12, and which is provided with rollers running on ribs 50 so as to rotate with the cylinder body 1, casings 9, 15, and driven shaft 44. Automatic valves are provided between each of the grooves 30, 31 and the interior of the gear case, so arranged as to open under the influence of the suction of the pumps 3 if the pressure in the latter falls below the pressure in the gear case. In addition, two safety-valves provided with strong springs are arranged between the passages of one of the distributors. If the mechanism is running forwards or reversed, and if the operating-gear is actuated to place the plate 6 perpendicular, i.e. in the position of free engine, braking is produced. Fig. 4 shows another form of the apparatus in which the disk 53 carrying the first system of pumps is fixed to the driving-shaft 54 instead of being fixed to the gear case, and the crown plate 60 is also driven solid with the same shaft. The plate is inclined by means of a lever 63 carrying a roller 64 working in a slot in the longitudinally-moving piece 66 as shown in Fig. 7. The distributor 67 is fixed to the gear case and rotates with it, and is further fixed to the driven shaft 68. The liquid is forced to the driven system which is fixed. The inclination of the crown plate 73 is controlled automatically by means of the piston 75, which is acted upon on one side by the pressure of the liquid and on the other by a spring 76, so that as the pressure in the system increases due to additional loading, the speed of the driven shaft is decreased.