Patent GB-1180634-A (GB)
Title: A Split Torque Type Automatic Speed Change Device
IPC: F16H47/08
Filed: 1967-06-12
Abstract: 1,180,634. Change-speed gear. NISSAN JIDOSHA K.K. 12 June, 1967 [30 June, 1966], No. 26979/67. Heading F2D. In a vehicle change-speed gear comprising a torque converter or fluid coupling including a pump 2 and a turbine 3, and a planetary gear-set the axis of which is disposed parallel to the axis of rotation of the converter or coupling, splittorque drive from the engine-driven crank-shaft 1 to the forward and/or rear propeller shafts 161, 162 is transmitted via a shaft 160 connected to the pump or turbine and gear-wheels 11-13 to one element (e.g. the planet carrier 61) of the planetary gear-set, and via a gear-wheel 8 connected to the other one of the pump or turbine and gear-wheels 9 and 10, to another element, (e.g. the sun 58), of the planetary gear-set, the output element of the gear-set (e.g. ring gear 62) driving a gear-wheel 28 on the propeller shafts. The gear-wheels 9, 10 and 12, 13 may be replaced by suitable chains or belts (not further described). As shown, a four forward- and reversespeed gear includes intermeshed planets 59, 60 mounted on an input carrier 61 selectively clutched at 66 to the input gear-wheel 13 or braked at 64. The planets 59 mesh a first input sun 57 clutched at 52 to the input gear-wheel 10 or braked at 54, and an output ring 62, and the planets 60 mesh a second input sun 58 clutched to the input wheel 10 at 50. First and second ratios are all-hydraulic, the mechanical path clutch 66 being released, the fluid path clutch 50 engaged, a one-way detent 63 holds the planetcarrier 61 for normal low, whilst the brake 64 is applied to the carrier for manual low, and brake 54 is applied to the first sun 57 for second. Split-torque third is obtained with the brakes released and with the clutches 66, 50 engaged. All mechanical overdrive top is obtained by engaging clutch 66 and brake 54. For reverse, the clutch 53 and brake 64 are engaged. The clutches and brakes may be automatically hydraulically operated. Bevel differential gears, Figs. 10 and 11 (not shown), may be inserted between the bevel gears 164 and the vehicle axles 165, and between the gear-wheel 28 and propeller shafts 161, 162. Again, Fig. 5 (not shown), the shaft 160 is driven by the turbine 3 and the gear-wheel 18 by the pump 2, the planetary gear-set and its associated clutches and brakes being turned around horizontally by 180 degrees so that its operation is identical to that of Fig. 3. In Fig. 6 (not shown), the gear-set comprises two three-element trains, the suns (79), (83) being integral and clutchable by a fluid path clutch (72) to the input gear-wheel 10, or braked at (85). The first ring gear (76) and second carrier (82) are selectively clutchable by a fluid path clutch (74) and the mechanical path clutch (88) to input gear-wheels 10 and 13, respectively, and the second carrier (82) may be braked at (90). Output is taken from the integral first carrier (78) and second ring gear (80). Again, Fig. 7 (not shown), the two three-element trains are compounded, the first sun (107) and second ring gear (110) being integral and clutchable by a fluid path clutch (101) to the input gear-wheel 10, and the first ring gear (104) and second carrier (112) being integral and clutchable by the mechanical path clutch (118) to the input gearwheel 13, or braked at (115). The second sun (113) is clutchable by a fluid path clutch (103) to the input gear-wheel 10 or braked at (119), and output is taken from the first carrier (106). Again, Fig. 8 (not shown), the first ring gear (130) and second sun (127) are integral and clutchable by a fluid path clutch (120) to the input gearwheel 10, and the first sun (133) is clutchable by a fluid path clutch (123) to the input gear-wheel 10 or braked at (139). The second ring gear (124) is clutchable by the mechanical path clutch (138) to the input gear-wheel 13 or braked at (135), output being taken from the integral carriers. Also, Fig. 9 (not shown), the suns (153), (147) are individually clutchable by fluid path clutches (141), (143) to the input gear-wheel 10, and the sun (147) may be braked at (159). The integral first ring gear (150) and second carrier (146) are clutchable by the mechanical path clutch (158) to the input gearwheel 13 or braked at (155). Output is taken from the integral first carrier (152) and second ring gear (144). In a two forward- and reverse-speed gear, Fig. 2 (not shown), the input gear-wheel 10 drives a first input sun (14) directly, the sun meshing planets (16) on an output carrier (19) which also carries intermeshing planets (17) which mesh a second input sun (15) and a ring gear 18. The sun (15) is selectively clutched by the mechanical path clutch (22) to the input gear-wheel 13 for split-torque top, or braked at (26) for first. For reverse, the ring gear (18) is braked at (27), sun (15) idling. A fluid coupling (F), Fig. 12 (not shown), may be inserted intermediate the ends of the shaft 160, or between the input gearwheel 13 and clutch (22), or the clutch (22) and the sun gear (15), to reduce shock on engaging clutch (22).