Patent GB-788716-A (GB)
Title: Improved shift device for change speed gears
IPC: F16H63/20
Filed: 1956-07-23
Abstract: 788,716. Operating change-speed gearing. ZAHNRADFABRIK FRIEDRICHSHAFEN AKT.-GES. July 23, 1956 [July 23, 1955], No. 22780/56. Addition to 751,899. Class 80 (2). A gear-box providing eight forward and two reverse speeds has four parallel slidable selector members 12, 17, 18, 20. The members 12, 17, 18 each have two recesses 8, 9 cooperable with pairs of axiallyspaced arms 10, 10<SP>1</SP> and 11, 11<SP>1</SP> projecting respectively from a sleeve 2, splined on a rotatable transverse shaft 3 so as to be slidable and turnable under the control of an operating lever 1, and from a sleeve 5 splined on a rotatable parallel shaft 4 and linked with the sleeve 2 by a ball-ended arm 6 so as to slide therewith but to turn in the opposite direction. The arms 10, 10<SP>1</SP>, 11, 11<SP>1</SP> are shaped as shown in Fig. 1, so that they can slide the selector members 12, 17, 18 from neutral position only when the members 2, 5 turn in one direction. The member 20 has a recess 22 engaged with play by an arm 21 projecting from a member 19 secured on shaft 3. The gear comprises an input shaft 41, Fig. 4, an intermediate shaft 42, an output shaft 40, a. countershaft 47, and engaging members 12<SP>11</SP>, 17<SP>11</SP>, 18<SP>11</SP>, 20<SP>11</SP> operated respectively by the members 12, 17, 18, 20 for the various gear trains. With the parts initially in the neutral position shown and with the arms 10, 11 only engaging the recesses in member 12, first speed is engaged by turning member 2 anti-clockwise so that arm 10 moves member 12 to the right, Fig. 2, and arm 19 moves member 20 to the right after some delay, while arm 11, which has turned clockwise, is ineffective, the drive being through gears 31, 31<SP>1</SP>, 25, 251. Second speed is engaged by turning member 2 clockwise, whereby arm 10 is ineffective while arm 11, turning anti-clockwise, is effective to move member 12 again to the right, and arm 19 moves member 20 to the left, drive now being through gears 32, 32<SP>1</SP>, 25, 25<SP>1</SP>. By moving member 2 axially to the right one stage from the position shown in Fig. 2, so that arms 101, 11<SP>1</SP> engage the recesses in member 12, the latter moves to the left when member 2 is turned in either direction, affording third, or fourth speeds through gears 31, 31<SP>1</SP>, 26<SP>1</SP>, 26 or 32, 321, 261, 26, depending on the direction in which member 2 is turned. Fifth and sixth speeds are obtained by moving member 2 another stage to the right, so that arms 10, 11 engage the recesses in member 17, drive then being through gears 31, 31<SP>1</SP>, 271, 27 or 32, 32<SP>1</SP>, 27<SP>1</SP>, 27. Seventh and eighth speeds are obtained by moving member 2 still another stage to the right, so that arms 101, 111 engage the recesses in member 17<SP>1</SP>, seventh speed being direct through shaft 42 and eighth speed being an overdrive through gears 32, 32<SP>1</SP>, 31<SP>1</SP>, 31. Two reverse speeds are obtained by moving member 2 to the left from the Fig. 2 position so as to engage the arms 10<SP>1</SP>, 11<SP>1</SP> with the member 18, drive being through gears 31, .31<SP>1</SP> or 32, 32<SP>1</SP> and gears 28, 29, 30. A second arm 23 on member 19 has an arcuate end co-operating with a recess 24 in member 20 so as to be ineffective to move member 20 from neutral position but effective to return member 20 to neutral position without any delay. The space between members 17, 20, Fig. 2, may be increased so as to enable member 2 to be moved to an extreme right-hand position in which the arms 10, 101, 11, 11<SP>1</SP> are all disengaged. A power take-off shaft connected at 49 to the countershaft 47 may then be driven at two speeds, through gears 31, 31<SP>1</SP> or 32, 32<SP>1</SP>, with shaft 40 idle.