US3600960A — Infinitely variable cone pulley transmission

Claim 1

Independent Claim 242 words

An infinitely variable cone pulley transmission having a drive and driven shafts, at least two pairs, each composed of first and second conical pulley disks, one pair on each said shafts, at least one endless transmitting element connecting and running between said two pairs of conical pulley disks, wherein one disk of each pair on the drive and driven shafts is movable in the axial direction relative to the other disk and wherein hydraulic fluid supply means create solely the contact pressures with which the conical disks are applied against the transmitting element at both sides of the transmission in a manner so as to be automatically load-responsive, for which purpose the axially movable conical disks are constituted by rotating hydraulic cylinders connected to said fluid supply means each containing a piston rigidly connected to the associated shaft, said transmission further having a slide valve for maintaining and varying the speed ratio of the transmission, in which at least the driving side of the transmission is provided with an indicator for indicating the torque which is transmitted at that side, and means connected to said indicator and responsive to changes in the torque indication thereof to vary the supply of fluid to the cylinder at the driven side so as to vary the hydraulic contact pressure which is applied at the driven side, said varying means including at least two elements movable relative to each other in response to variations in torque.

Claim 2

Dependent Claim 242 words

An infinitely variable cone pulley transmission having a drive and driven shafts, at least two pairs, each composed of first and second conical pulley disks, one pair on each said shafts, at least one endless transmitting element connecting and running between said two pairs of conical pulley disks, wherein one disk of each pair on the drive and driven shafts is movable in the axial direction relative to the other disk and wherein hydraulic fluid supply means create solely the contact pressures with which the conical disks are applied against the transmitting element at both sides of the transmission in a manner so as to be automatically load-responsive, for which purpose the axially movable conical disks are constituted by rotating hydraulic cylinders connected to said fluid supply means each containing a piston rigidly connected to the associated shaft, said transmission further having a slide valve for maintaining and varying the speed ratio of the transmission, in which at least the driving side of the transmission is provided with an indicator for indicating the torque which is transmitted at that side, and means connected to said indicator and responsive to changes in the torque indication thereof to vary the supply of fluid to the cylinder at the driven side so as to vary the hydraulic contact pressure which is applied at the driven side, said varying means including at least two elements movable relative to each other in response to variations in torque.

Claim 3

Dependent Claim 215 words

A transmission as defined in claim 1, in which the first conical disk of one pair is fixed to the drive shaft and forms a third rotating hydraulic cylinder; this cylinder containing a third piston which is rotatable on and axially slidable along the drive shaft and serves for transmitting the torque between a motor and the conical disk fixed to the drive shaft and divides the third cylinder into a front chamber and a rear chamber which is acted upon by the hydraulic pressure of the driven side of the transmission; the third piston and the conical disk fixed to the drive shaft carrying within the front chamber of this cylinder cam projections extending in the axial direction toward each other and having V-shaped recesses between which rolling members for transmitting the torque are positioned, said cylinder and third piston constituting said relatively movable elements; said varying means including a throttling element operatively connected with said third piston for determining the hydraulic pressure acting at the driven side and in the rear cylinder chamber, whereby this hydraulic pressure will correspond to the pressure which is required at the driven side for producing the contact pressure at that side and will balance the axial forces which are exerted upon the piston by the cam projections.

Claim 4

Dependent Claim 61 words

A transmission as defined in claim 2, in which said drive shaft has within the rear chamber an annular groove and a radial bore opening into the groove and a following axial bore for the escape of hydraulic fluid from the rear cylinder chamber; said throttling element comprising a control edge carried by a third piston cooperating with said annular groove.

Claim 5

Dependent Claim 139 words

A transmission as defined in claim 2, in which the third piston is provided with a tubular flangE which extends axially out of the rear cylinder chamber and is provided with a radially extending surface, a two-armed lever, a second slide valve, a spring acting on said second slide valve, one end of said two-armed lever engaging said annular surface, said two-armed lever being pivotably mounted between its ends and the other end of said two-armed lever engaging said second slide valve so as to actuate the same against the action of said spring, a return line for the fluid which has been conducted to the driven side of the transmission and to the rear cylinder chamber on the drive shaft, said second slide valve being adapted to throttle the return flow of the oil through said return line.

Claim 6

Dependent Claim 25 words

A transmission as defined in claim 4, including means to adjust the effective length of at least one of the arms of the two-armed lever.

Claim 7

Dependent Claim 21 words

A transmission as defined in claim 4, including means to adjust the pivot point of the two-armed lever to different positions.

Claim 8

Dependent Claim 68 words

A transmission as defined in claim 2, in which the flanks of each V-shaped recess are inclined at different angles so that the steeper flanks engage with and bear on the rolling members when the transmission is driven at its normal driving side, while the less inclined flanks engage with and bear on the rolling members when the normal driven side becomes the driving side of the transmission.

Claim 9

Dependent Claim 103 words

A transmission as defined in claim 1, including a bushing carrying the conical disks rotatably mounting the disks on the driving shaft nonrotatably relative to each other; means to effect torque transmission between the driving shaft and the conical disks on said bushing comprising a spring element which is effective in the direction of rotation of the drive shaft; said varying means including a throttling element adapted to be adjusted for determining the hydraulic pressure acting at the driven side of the transmission; said spring element being operatively connected to said throttling element to change the setting thereof in response to torque variations.

Claim 10

Dependent Claim 105 words

A transmission as defined in claim 8, having a flange which surrounds the drive shaft without play and is integral with the second conical disk on the drive shaft means, preventing said second conical disk from sliding axially away from the endless transmitting element; one side of said spring element acting in the peripheral direction on the drive shaft and the other side acting upon said flange; and the drive shaft being provided with an axial bore which is continued by a radial bore; the flange being provided with a radial bore; and the adjacent ends of the two radial bores constituting said throttling element.

Claim 11

Dependent Claim 135 words

A transmission as defined in claim 1, including means to supply the two sides of the transmission independently of each other with oil under pressure; the first conical disk of one pair being fixed to the drive shaft; the part of the drive shaft carrying the fixed conical disk having a coaxial bore, said varying means including a slide valve in said bore which is adapted to maintain and to vary the speed ratio of the transmission and determines the contact pressure of the conical disks at this side of the transmission against the transmitting element; said indicator includes a governor acting on this slide valve which is operative in response to the speed of the shaft at the driving side of the transmission and to the power output of the driving motor as adjusted.

Claim 12

Dependent Claim 83 words

A transmission as defined in claim 1, for maintaining and varying the speed ratio of the transmission, includes means to supply oil under pressure to both sides of the transmission, said supply means including a distributing slide valve having four control edges; a return line for oil passing said distributing slide valve; and said varying means comprising a torque-responsive throttling element positioned in said return line to control the amounts of oil flowing past the outer control edges of the distributing slide valve.

Claim 13

Dependent Claim 132 words

A transmission as defined in claim 1, in whIch the cylinders containing the fixed pistons forming inner and outer chambers on opposite sides of the pistons; said fluid supply means supplying fluid to the chamber on the other side of the piston from the conical disk; a second fluid supply means connected to each cylinder chamber located between the associated slidable disk and the fixed piston, the strength of said second fluid supply means being determined by the torque indicator so as to be load-responsive, for which purpose the oil which is supplied by the second source flows off through the torque indicator; the first fluid supply means including a distributing slide valve having four control edges to vary the pressure, which counteracts the pressure which is supplied by the second source.

Claim 14

Dependent Claim 94 words

A transmission as defined in claim 1, in which said supply means includes means to supply both sides of the transmission independently of each other with oil under pressure; the load-responsive contact pressures of the driven side being determined by the torque acting upon the driving side; and a return line from at least one side; and slide valve means in said return line for controlling the amounts of oil flowing off through the return line, said slide valve means having two control edges for maintaining and varying the speed ratio of the transmission.

Claim 15

Dependent Claim 86 words

A transmission as defined in claim 11, in which each side of the transmission is provided with a torque-responsive throttling element, a return line from at least one side, a switch valve which is controlled by the higher hydraulic pressure of the respective driving side coming from the distributing slide valve with four control edges, the throttling element at the driving side of the transmission being connected in the return line to control the oil flowing off past the outer control edges of the slide valve.

Claim 16

Dependent Claim 77 words

A transmission as defined in claim 11, in which one of the axially slidable conical disks has an annular groove in its peripheral surface, and in which for maintaining and varying the speed ratio of the transmission a two-armed control lever is provided which acts upon the slide valve and has one end slidably engaging into said annular groove while its other end is connected to an element for arbitrarily varying the speed ratio of the transmission.

Claim 17

Dependent Claim 56 words

A transmission as defined in claim 11, in which the means for maintaining and varying the speed ratio of the transmission includes a governor which is affected by the speed of the shaft which is connected to the motor and by the power output of the motor as adjusted, said governor acting on said slide valve.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-08-23	1975-02-22	1975-08-24	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-08-23	1979-02-22	1979-08-24	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-08-23	1983-02-22	1983-08-24	$7700.00	Window Closed / Lapsed

Infinitely variable cone pulley transmission

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