Control device for a motor and an infinitely variable cone-pulley gear

Claim 2

In a drive comprising a motor of variable power output and load-dependent speed of rotation and an infinitely variable conepulley transmission driven by said motor, and fluid-pressure means supplying fluid to the transmission for controlling the sides of the transmission to adjust the transmission ratio, a control slide for adjustment of the pressure of the fluid, a motor regulating lever and a centrifugal governor rotating proportionally with the speed of rotation of an element of the drive, and including means at each setting of the regulating lever to provide a specific motor speed at which the centrifugal governor is in the steady state, and means to transmit the motion of the motor regulating lever to the control slide, said transmitting means including delay means for retarding the movement of the control slide by the movement of the regulating lever, said delay means including means to delay the movement of the control slide in inverse proportion to the speed of movement of the regulating lever.

Claim 3

A drive as claimed in claim 1, in which the delay means comprises first and second cylinder-piston assemblages (38, 39) arranged one behind the other with double-acting pistons (40, 42) and a self-contained pressure medium circuit for each assemblage connecting the spaces in the cylinder on opposite sides of the piston, first means connecting the piston (40) of the first cylinder piston assemblage (38) with the regulating lever (17), second means connecting the cylinder (41) of the first assemblage with the piston (42) of the second assemblage (39) and the piston of the second assemblage with the control slide (14), the cylinder (45) of the second cylinder piston assemblage (39) being stationarily arranged, a compression spring (43, 44) on each of the two sides of the piston of the first assemblage, which springs engage on the other sides against the cylinder (41), said pressure medium circuits each containing a calibrated orifice (48, 49), the throttling action of the calibrated orifice (48) of the first assemblage (38) being less than that of the assemblage (39) and two oppositely acting over-pressure valves (50, 51) connected in parallel with the second cylinder piston assemblage.

Claim 4

In a drive according to claim 2, in which the throughflow quantity of the calibrated orifice (48) of the first assembly is proportional to the square and the throughflow quantity of the calibrated orifice of the second assembly (49) together with one of the over-pressure valves (50, 51) is proportional to the square root of the pressure difference in the associated cylinder piston assemblages (38 and 39) respectively.

Claim 5

In a drive according to claim 1, in which the transmitting means includes a double-acting pump (70) articulated to the motor regulating lever (17), first means connecting the outlets of the pump to a pressureless reservoir (80), a constricted orifice in said first connecting means, a constriction device (81) which can be enlarged in cross-section, means connecting the outlets of the pump to said constriction device to exert a force thereon tending to increase the cross-section thereof, means to exert a return force on the constriction device, a pressure-medium operated setting member (90) comprising a double-acting piston (91) operatively connected to the control slide (14) and a two-edged control slide (93) for controlling the supply of fluid from said constriction device to said double-acting piston, means articulating the motor regulating lever tO the double-acting piston and the two-edged control slide, one piston side of the setting member (90) being connected through the constriction device (81) to a pressure medium of constant pressure and the other being connected through the two-edged control slide (93) to the reservoir for the pressure medium in such a way that on setting of a higher motor torque the setting member (90) is displaceable for the setting of an increased gear input rotation speed.

Claim 6

In a drive according to claim 1, a setting device (96) for varying the steady rotation speed of the centrifugal governor (22) allocated to a specific motor torque set on the motor (1) and thus of the motor rotation speed in the connection of the motor regulating lever with the control slie (14).

Claim 7

In a drive according to claim 5, the setting device (96) being operable by the pressure medium delivered by the pump (70) in such a way that the steady rotation speed of the centrifugal governor (22) and thus the motor rotation speed is proportional to the pressure medium pressure.

Claim 8

In a drive according to claim 6, means for actuating of the setting device (96) comprising a cylinder-piston assemblage (99) and a return spring (101) resisting the movement of the piston thereof.

Claim 9

In a drive according to claim 1, a centrifugal governor (110) rotating in proportion with the gear output rotation speed, and having a setting element, the setting element (113) acting upon the regulating lever (17) through its connection with the control slide (14) and the regulating lever being articulated to the setting element in such a way that the gear output rotation speed is variable by it on the setting element and a motor output power is variable by means of the setting element.

Claim 10

Drive according to claim 8, the articulation of the throttle control lever (17) to the pump (70) comprising a branching in the form of a balance lever (118) mounted fixedly (119) between the ends, the end of the balance (118) remote from the connection of the branching to the connection between the throttle control lever and the pump forming a pivot point (117) for a second balance lever (116) which acts upon the setting element (113) of the drive output centrifugal governor (110) and on the power output setting for the motor and its connection with the control slide (95).

Claim 11

Drive according to claim 9, the second balance lever (116) acting before the setting device (96) in relation to the control slide (14).

Claim 12

Drive according to claim 1, the centrifugal governor (22, 110) comprising a two-edged control slide (23) having a control piston adjustable radially in relation to its rotation, the surface of the central piston allocated to one control edge (27) together with a differential piston (24) forming a cylinder chamber charged at least partially by the pressure medium conducted to the associated gear side, in such a way that the control piston is pressed radially inwards against the action of the centrifugal force by the action of the pressure medium, and the pressure medium being thence fed by way of the second control edge (27'') to a pressureless outlet, and to a cylinder piston assemblage as the setting element (21, 113) of the centrifugal governor which is operable against a return spring (32, 115).

Claim 13

Drive according to claim 1 for a motor vehicle drive, wherein a stationary throttle orifice is arranged in each of the pressure medium conduits from the control slide to the gear sides, a by-pass conduit (54, 55) for the throttle orifices (52, 53) is openable by two slides (56, 57) arranged one behind the other, means to vent the cylinder chamber (29, 112) of the setting element (21, 113) for the centrifugal governor or governors (22, 110), one slide (56) going into the open position by the action of a spring (58) when the pressure medium pressure delivered by the drive input centrifugal governor (22) to its setting element (21) falls short of the value corresponding to the minimum rotation speed of the motor (1), the other slide (57) going into the open position when the setting pressure of the vehicle brake exceeds a specific value.

Claim 14

Drive according to claim 12, the first slide (56) being formed on its side opposite to the spring (58) as a power piston (59) charged by the pressure medium pressure delivered by the drive input centrifugal governor (22), the spring (58) being a compression spring, the slide housing forming the cylinder for the power piston (59) and the abutment for the spring (58).

Claim 15

Drive according to claim 12, a magnet (60) for moving the second slide (57) against the action of a return spring into the open position, operating magnet being energizable by a pressure medium switch connected with the vehicle brake.