Installation for adjusting power turbine guide blades in twin-shaft gas turbine engines, especially for the drive of motor vehicles

Claim 2

An installation for adjusting the power turbine guide blades in a gas turbine engine, which serves in particular for the drive of motor vehicles, in which the movement of an actuating piston means is adapted to be transmitted to a rotatably mounted ring gear, and in which the turbine guide blades are adjustable by the ring gear by way of bevel gears, characterized by a lever means consituting a transmission means for producing nonlinear leverage between the movement of the actuating piston means and the angular motion of the adjustable turbine guide blades in the operating range from drive to braking, characterized in that the lever means includes a pair of levers which by their more or less extended relative position between a fulcrum thereof and a point of pivotal connection with the ring gear impart a motion to the point of pivotal connection that provides the required nonlinear leverage of the adjustable guide blades, characterized in that the pair of levers are disposed near their fully extended straight-line position in the operating condition drive, in which the lever advantage of the point of pivotal connection with respect to the movement of the adjusting piston means is large, and characterized in that the pair of levers are deflected farthest away from the fully extended position in the operating condition braking in which the lever advantage of the point of pivotal connection with respect to the movement of the adjusting piston means is small.

Claim 3

An installation according to claim 1, characterized in that the actuating lever engages with the ring gear at the point of pivotal connection substantially tangentially with respect thereto so as to eliminate transverse forces.

Claim 4

An adjusting arrangement for adjusting guide vanes on a gas turbine engine of the type having radially extending guide vanes arranged upstream of an engine turbine means, said engine being operable in a drive condition and braking and neutral conditions; said adjusting arrangement comprising: mounting means for mountinG guide vanes for rotation about respective radially extending guide vane axes, linearly movable actuating piston means, moving means for moving said actuating piston means, and transmission means separate from said moving means for transmitting linear movement of said piston means into rotatable movement of said guide vanes about said respective vane axes, wherein said transmission means includes means for nonlinearly transmitting movement of said piston means into movement of said guide vanes with said guide vanes being rotated by a greater amount in response to a predetermined linear movement of said piston means when said engine is in said braking and neutral conditions than the amount said guide vanes are rotated in response to a similar predetermined linear movement of said piston means when said engine is in said drive condition, whereby the accuracy of guide vane adjustment in the drive condition and the rapidity of guide vane adjustment in the braking and neutral conditions are optimized.

Claim 5

An adjusting arrangement for adjusting guide vanes on a gas turbine engine of the type having radially extending guide vanes arranged upstream of an engine turbine means, said engine being operable in a drive condition and braking and neutral conditions; said adjusting arrangement comprising: mounting means for mountinG guide vanes for rotation about respective radially extending guide vane axes, linearly movable actuating piston means, moving means for moving said actuating piston means, and transmission means separate from said moving means for transmitting linear movement of said piston means into rotatable movement of said guide vanes about said respective vane axes, wherein said transmission means includes means for nonlinearly transmitting movement of said piston means into movement of said guide vanes with said guide vanes being rotated by a greater amount in response to a predetermined linear movement of said piston means when said engine is in said braking and neutral conditions than the amount said guide vanes are rotated in response to a similar predetermined linear movement of said piston means when said engine is in said drive condition, whereby the accuracy of guide vane adjustment in the drive condition and the rapidity of guide vane adjustment in the braking and neutral conditions are optimized.

Claim 6

An arrangement according to claim 3, wherein said drive condition of said engine ranges from full load to the lowest practicable partial load on said engine.

Claim 7

An adjusting arrangement for adjusting guide vanes on a gas turbine engine of the type having radially extending guide vanes arranged upstream of an engine turbine means, said engine being operable in a drive condition and braking and neutral conditions; said adjusting arrangement comprising: mounting means for mounting guide vanes for rotation about respective radially extending guide vane axes, linearly movable actuating piston means, means for moving said actuating piston means, and transmission means for transmitting linear movement of said piston means into rotatable movement of said guide vanes about said respective vane axes, wherein said transmission means includes means for nonlinearly transmitting movement of said piston means into movement of said guide vanes such that said guide vanes are rotated by a greater amount in response to a predetermined linear movement of said piston means when said engine is in said braking and neutral conditions than the amount said guide vanes are rotated in response to a similar predetemined linear movement of said piston means when said engine is in said drive condition, whereby the accuracy of guide vane adjustment in the drive condition and the rapidity of guide vane adjustment in the braking and neutral conditions are optimized, wherein said transmission means includes ring means which is rotatable about an axis extending perpendicular to said vane axes and gear means drivingly connecting said ring means and said guide vanes such that predetermined rotational movement of said ring means results in corresponding similar predetermined rotational movement of said guide means for all conditions of said engine.

Claim 8

An adjusting arrangement for adjusting guide vanes on a gas turbine engine of the type having radially extending guide vanes arranged upstream of an engine turbine means, said engine being operable in a drive condition and braking and neutral conditions; said adjusting arrangement comprising: mounting means for mounting guide vanes for rotation about respective radially extending guide vane axes, linearly movable actuating piston means, means for moving said actuating piston means, and transmission means for transmitting linear movement of said piston means into rotatable movement of said guide vanes about said respective vane axes, wherein said transmission means includes means for nonlinearly transmitting movement of said piston means into movement of said guide vanes such that said guide vanes are rotated by a greater amount in response to a predetermined linear movement of said piston means when said engine is in said braking and neutral conditions than the amount said guide vanes are rotated in response to a similar predetemined linear movement of said piston means when said engine is in said drive condition, whereby the accuracy of guide vane adjustment in the drive condition and the rapidity of guide vane adjustment in the braking and neutral conditions are optimized, wherein said transmission means includes ring means which is rotatable about an axis extending perpendicular to said vane axes and gear means drivingly connecting said ring means and said guide vanes such that predetermined rotational movement of said ring means results in corresponding similar predetermined rotational movement of said guide means for all conditions of said engine.

Claim 9

An arrangement according to claim 5, wherein said transmission means includes first and second lever members, said first lever being pivotally connected at one end to said ring means and at the other end to one end of said second lever member, the other end of said second lever being pivotally connected to said piston means, said second lever being pivotally connected to a fulcrum intermediate the ends of said second lever.

Claim 10

An arrangement according to claim 6, wherein said first and second lever members are more nearly aligned with one another when said engine is in said drive condition than when said engine is in either of said neutral and braking conditions.

Claim 11

An arrangement according to claim 7, wherein said drive condition of said engine ranges from full load to the lowest practicable partial load on said engine, and wherein said first and second lever members are substantially aligned with one another when said engine is in said drive condition at full load.

Claim 12

An arrangement according to claim 8, wherein said first and second lever members are maximally angled with respect to one another when said Engine is in said braking condition at maximum braking.

Claim 13

An arrangement according to claim 8, wherein said engine is a double shaft automobile driving gas turbine engine.

Claim 14

An arrangement according to claim 9, wherein said engine is a double shaft automobile driving gas turbine engine.

Claim 15

An arrangement according to claim 5, wherein said ring means is a toothed ring extending around the outer ends of said guide vanes, and wherein said gear means include beveled gear means.

Claim 16

An arrangement according to claim 9, wherein said ring means is a toothed ring extending around the outer ends of said guide vanes, and wherein said gear means include beveled gear means.

Claim 17

An arrangement according to claim 6, wherein said first lever engages the ring means substantially tangentially so as to reduce transverse forces.

Claim 18

An arrangement according to claim 9, wherein said first lever engages the ring means substantially tangentially so as to reduce transverse forces.

Claim 19

An arrangement according to claim 3, wherein said rotational movement of said guide vanes is a parabolic function of the linear movement of said piston means.

Claim 20

An arrangement according to claim 9, wherein said rotational movement of said guide vanes is a parabolic function of the linear movement of said piston means.