Patent GB-455034-A (GB)
Title: Improvements in or relating to change-speed transmissions of the planetary gear type
IPC: F16H61/02
Filed: 1935-01-10
Abstract: 455,034. Controlling change speed epicyclic gearing. CHRYSLER CORPORATION, 341, Massachusetts Avenue, Highland Park, Michigan, U.S.A.-(Assignees of Neracher, C. A., and lavelli, T.) Jan. 10, 1935, No. 925. Convention date, Nov. 14, 1934. [A Specification was laid open to inspection under Sect. 91 of the Acts, July 26,1935.] [Classes 80 (ii) and 80 (iii)] [See also Group XXXIV] The brakes 32, 33, Fig. 4, and a solid driving clutch 51 of change-speed planetary gearing are put in alternatively by a segmental rack bar D which is turned manually to select and thrust axially by pressure oil to operate. The bar D has segmental racks 77, 78, 79 and 80 for reverse and first, second, and third speeds. The selector turning brings one of these racks as seen in Fig. 5 into engagement with a toothed sector such as 75 on one of a number of right- and-left handed screwed rods 70, each of which applies its own brake 35 &c. The rack 80, Fig. 4, is connected through intermeshing levers 59, 55 to thrust the clutch cone 51 into engagement. The bar D is geared through pinion teeth 82, a pivoted sector 83, a link 87 and cranks to a tube 90, Fig. 3, beside a vehicle steering column 92, so that turning a lever arm 148 in the plane of Fig. 2 by hand effects the manual selector turning of the bar D. The raising of the arm 148 to bring a dog 157, Fig. 3, out of engagement with a locking quadrant 152 pulls a Bowden cable 138 which turns a lever 133, Fig. 4, clockwise so as to thrust a waisted valve 121 right of Fig. 9. This exhausts an hydraulic cylinder 105, Fig. 8, so that a spring 100 thrusts the bar D left to free position. After the selector turning movement, depression of the arm 148 to locked position shoots the valve 121 left of Fig. 9 which connects the cylinder 105 to a duct 114, Fig. 4, receiving oil from a pump 115 driven constantly from the driving- member 21 of an hydraulic clutch B. This oil acting on a piston 107, Fig. 8, thrusts the bar D right to bring in a brake &c. and holds it at right with the brake &c. applied. Depression of a pedal in the place of the usual clutch pedal thrusts a link 194, Fig. 4, right which has the same effect as pulling the cable 138 left, namely, to vent the pressure oil and bring the bar D to no-drive position. The bar D has a blank gap at 81, Fig. 5, so that it can be turned to neutral, the power stroke then being a blind one. One speed such as the third may be put in independently by hand by pulling a cable 172, Fig. 4, the arm 148 being in neutral. A lever 168 rotates about its pivot 169 so as to turn the solid-drive clutch engaging lever 55 about its pivot 56. This cable 172 is connected to a pull-button 166, Fig. 1a, on the dash. The button 166 is locked in its two positions by a cross bolt 177 acted on by a spring 178. To move the button it is necessary to push in a spring plunger 181 with a cam end 184 which releases the bolt 177 from a notch 175 &c. The power cable 138, Fig. 3, passes up through the selector tube 90 and through a boss 146 rigid with that tube to an upper lever 159. The control arm 148 is pivoted upon the boss 146 so as to turn it and the tube and carries a bracket 158 upon which the lever 159 is supported. A spring 164 normally holds the arm 148 down on the quadrant 152 and the free end of the lever 159 hard against a fixed rim 162. The lifting of the arm 148 causes the lever 159 to rotate about the rim 162 as pivot, so as to magnify the displacement of the cable 138 and therefore of the hydraulic valve 121. The bar D is prevented from sliding unless it is turned to a proper position with splines 202, Fig. 4, in line. Each brake 35, Fig. 5, is floatingly supported on intermeshing levers 44 with a spring connection 49 so that the brake exerts no lateral thrust on its drum. Each brake-actuating screwed shaft 70 carries a crank-arm 198. In the free position of the bar D all these arms 198 rest on adjustable stops 196, Fig. 6, so that the rack parts are ready to engage. To adjust for wear, U- shaped bolts 203, Fig. 5, which lock nuts 66, Fig. 7, are pulled out, and the freed nuts are displaced and locked again by replacing the bolts 203. The Specification as open to inspection under Sect. 91 comprises also an arrangement shown in Fig. 12 (Cancelled), in which servo action effects both the selector turning and the executor sliding of the segmental rack bar D. Selection is effected by setting a control lever 305 of a servomotor E manually to positions 1, 2, 3, N, R, and nothing happens until an executor button 348 is depressed. The bar D is geared so as to be turned by power when a circular rack 292 with piston ends reciprocates. The rack 292 is geared through a pinion 304 on the lever 305 to a rack on a leader valve 297. The bar D is geared for sliding through a circular rack 359 to a gear segment 358 rigid with a lever 356 engaging a piston rod in a cylinder H. Depression of the executor button 348 depresses a valve 332 which connects to pressure oil at 326 a duct 330 so that a valve piston 379 is raised to open the selector servomotor E to oil pressure at 308. The rising piston 379 through a link 375 tilts the lever 356 to turn the gear segment 358 to effect the executor axial rightward displacement of the bar D, and this displacement is delayed until the servo selector stroke is completed by oil imprisoned above a piston 349 which. co-operates with a surge chamber 362. In a different arrangement described with reference to Figs. 14, 15, 16, 17, all cancelled, control is effected through a universally pivoted lever D which is swung manually in the plane of Fig. 15 (Cancelled) to select and is swung in the plane of Fig. 17 (Cancelled) to operate. In a further like arrangement shown in Fig. 19 (Cancelled), the executive servomotor is a hydraulic cylinder 574 let in by a pedal 537, but the servomotor in the arrangement of Fig. 16 (Cancelled) is mechanical, a nut 529 which screws along a fixed screw 531 when a clutch 525 splined upon the nut 529 is moved to engagement with a clutch 524 upon a sleeve 419 rigid with the engine-driven driving-member of the hydraulic clutch B, Fig. 14 (Cancelled). The selector movement by a hand lever 487 merely stresses springs at 504 and nothing further happens until the lever D has been brought by depressing the pedal 537 to the free position of Fig. 17 (Cancelled). During drive, a strong spring 513 holds the lever D with its head 482 pressing on one of a number of spring rods such as 469, the rod having yielded right of Fig. 16 (Cancelled), so as to apply one of a number of speed control brakes 422, 423, 424, 425 with the lever head 482 deep in a recess in a block 464. The head 482 is shown arrested on a neutral flat 473. After selection, and when the pedal is momentarily depressed, a rod 541 is thrust right so that the clutch 525 is struck left and the nut 529 rotated and screwed left so that a lever 551 turns anticlockwise and a collar 519, Fig. 17 (Cancelled), is struck right compressing the power spring 513 and allowing a light spring 523 to turn the lever D so that its head swings clear of the block 464 and the last used brake is released. The springs 504 in the selector train now swing a lever 479 which turns the pivot arbor 475 of the lever D causing the lever D to swing in the plane of Fig. 15 (Cancelled) opposite the actuating-rod such as 467 of a selected speed brake. As the pedal 537 is released, the power spring 513 expands to rock the lever D into one of the recesses in the block 464 to apply the selected brake and hold it in action. Each brake is applied by a right- and-left handed rod 449, Fig. 15 (Cancelled). In the arrangement of Fig. 19 (Cancelled), a control valve 568 of the hydraulic cylinder 574 is linked simply to the executor pedal 537. This subject-matter does not appear in the Specification as accepted.