Patent GB-459718-A (GB)
Title: Electric servo-motor control arrangements, particularly for variable speed transmissions for automobiles
IPC: F16H61/32
Filed: 1935-07-08
Abstract: 459,718. Controlling change speed gearing by power; distant control systems. FLEISCHEL, G., BlÚneau, Yonne, France. July 8, 1935, No. 19497. Convention date, Dec. 15, 1934. [Class 80 (ii)] [See also Group XXXVIII] A servo-operated device suitable for the control of vehicle change-speed gear boxes comprises an electric servomotor A, Fig. 2, the armature of which is displaced in steps one way and the other alternatively as initiated by primary two-directional control mechanism G. The servomotor A operates a switch C which continues the supply of current for the servomotor which stops in definite positions I-IV, Fig. 4, corresponding to forward speeds in a gear box F. The servomotor effects stepped displacements in both directions of a shaft 1 which, in one application, through a suitable selector current, liquid, or air distributer D controls the box F. A knob E acting through a clutch B, shown in Fig. 3 only, enables the switch C to be turned by hand, especially to the neutral position N, Fig. 4, reverse R, and forward automatic AV. The primary two-directional control G shown comprises the " release lever 14 " of Specifications 356,139, 360,262, 369,361, 376,730, and 406,884 which automatically or otherwise is rocked right against a terminal 7m to start a change up and is rocked left against a terminal 7d to start a change down. There are two starting circuits 9<m>, 9<d> for changes up and down respectively which connect to two different coils 11<m> and 11<d> of the motor A. The circuit 9<m>, Fig. 2, is connected to each of a set of spaced outer riband contacts m<1>, m<2>, m<3> fixed in gear position I, II and III, Fig. 4, on a non-rotary disc 20, corresponding to the first three forward speeds in the box F. The circuit 9<d> is connected to like outer contacts d<2>, d<3>, d<4> in positions II, III and IV. The contacts at I and IV are single since servo changes out of these positions are in one direction only. These motor starting circuits need, to start the motor, one and the same ball 19 in each circuit, and the direction of starting is determined by the two position " release " lever 14. The ball 19 is carried on a pillar 17, Fig. 2, carried in turn by a disc 16 splined on the motor shaft 1, so that the ball 19 is slid round in a groove 21 in the non-rotary insulating disc 20 as the motor turns. The disc 16 is conducting and carries two conducting fingers 22<m> 22d which are operative in the motor-continued-displacement circuits for changing up and down respectively. Thus, in second speed, the ball 19 is in position II, Fig. 4, touching contacts m<2> and d<2>. If there is to be a change up, the lever 14 is rocked right of Fig. 2, completing the starting- up circuit from a battery 10 to the coil 11<m>, and the ball 19 is carried by the now turning disc 16 clockwise of Fig. 4. Before the ball 19 has left the contact m<2> so as to break that circuit, the finger 22m engages a contact 23m upon a pillar contact 25<m> carried by a second revoluble disc 24. The disc 24 now turns along with the disc 16 and the pillar 25m engages the upper edge of a riband terminal m<20>, Fig. 4. This is one of a set of inner terminals m<10>, m<20>, m<30> which are connected together by a wire as shown in Fig. 2 and through a wire 26<m> to the coil 11<m> direct. Thus when the motor-starting circuit 9m is broken by the ball 19 leaving the contact m<2>, the motor coil 11<m> for upward changing is still supplied so that the shaft 1 keeps on turning until the pillar 25<m> has left the terminal m<20> at the bottom of Fig. 4. The motor then stops and the stopping is assisted by a brake 34, Fig. 2, the ball 19 engaging the terminals m<3>, d<3>, Fig. 4, ready to start a change up or down according to the direction of the next cant of the lever 14. A solenoid 29 mav be provided by which directly the continuing current starts, as it does in wires 26<m>, 28<m>, it breaks the starting circuit 9<m> at 30<m>. In changing down, the lever 14 starts the disc 16 turning left of Fig. 2, so that instead of the changing-up finger 22<m>, a changing-down finger 22d becomes operative, which has its own pillar terminal 25d and inner riband continuing contacts d<10>, d<20>, d<30>. Solenoids 31<m> and 31<d> are for closing and opening the throttle of an engine when changing up and down respectively. Fig. 7 shows an arrangement in which the two conducting fingers 22<m> and 22d of Fig. 2 between which and the contacts 23<m>, 23<d> there is lost motion, are replaced by a single finger 22<m> adapted to swing in a lost-motion slot 41 when the direction of the change of speed is reversed. The switch C shown in Fig. 3 differs from that of Fig. 2 mainly in that balls 22<m>, 22d are used instead of rigid fingers. Fig. 4 is a view of this switch. An electric selector distributer or switch D shown in Fig. 3, forms the subject of Specification 461,351.