Abstract A variable angle turbine nozzle actuating mechanism in which a nozzle-actuating ring is mounted co-axially of the nozzledefining members and is operatively connected thereto to effect their angular movement. The mechanism includes a pair of links pivotally connected to the nozzle-actuating member, a lever pivotally connected to the opposite end of each of the links and itself pivotally mounted on a support between the pivotal points thereon of the links, and a pivotally-mounted rocker arm drivingly engaged at its outer end with the lever. On turning the rocker arm, the lever will be swung about its pivot thereby simultaneously to push one link and to pull the other link to turn the nozzle-actuating member through a corresponding circumferential distance and hence to turn the nozzle-defining members through predetermined angles and to hold them in those angular positions. The lever is slidable on its support in the plane of the lever and the point of engagement of the rocker arm with the lever is also movable in the plane of the lever. On temperature change effecting expansion or contraction of one or both the links, the lever will slide with respect to the support and the rocker arm and expansion or contraction of the links will be accommodated without effecting any substantial movement of the nozzle-actuating member.
A turbine having a variable angle turbine nozzle actuating mechanism comprising a nozzle-actuating member in the form of a substantially complete annulus to be mounted co-axially of nozzle-defining members and operatively connected thereto to effect their angular movement, a pair of links pivotally connected to said nozzle-actuating member at positions thereon spaced apart circumferentially, a lever pivotally connected to the opposite end of each of said links, a support on which said lever is pivotally mounted at position on said lever between the pivotal points thereon of the links, and a pivotally-mounted rocker arm drivingly engaged at its outer end with the lever, whereby on turning said rocker arm, said lever will be swung about its pivot thereby simultaneously to push one said link and to pull other said link to turn said nozzle-actuating member through a corresponding circumferential distance and hence to turn the nozzle-defining members through predetermined angles and to hold them in those angular positions, said lever having means whereby it is slidable on said support in the plane of said lever and the point of engagement of said rocker arm with said lever also having means movable in the plane of said lever, whereby, on temperature change effecting change of length of at least one of said links, said lever will slide with respect to said support and said rocker arm, thereby to permit change of length of the links to be accommodated without effecting any substantial movement of the nozzle-actuating member.
Claim 2
Dependent Claim
246 words
A turbine having a variable angle turbine nozzle actuating mechanism comprising a nozzle-actuating member in the form of a substantially complete annulus to be mounted co-axially of nozzle-defining members and operatively connected thereto to effect their angular movement, a pair of links pivotally connected to said nozzle-actuating member at positions thereon spaced apart circumferentially, a lever pivotally connected to the opposite end of each of said links, a support on which said lever is pivotally mounted at position on said lever between the pivotal points thereon of the links, and a pivotally-mounted rocker arm drivingly engaged at its outer end with the lever, whereby on turning said rocker arm, said lever will be swung about its pivot thereby simultaneously to push one said link and to pull other said link to turn said nozzle-actuating member through a corresponding circumferential distance and hence to turn the nozzle-defining members through predetermined angles and to hold them in those angular positions, said lever having means whereby it is slidable on said support in the plane of said lever and the point of engagement of said rocker arm with said lever also having means movable in the plane of said lever, whereby, on temperature change effecting change of length of at least one of said links, said lever will slide with respect to said support and said rocker arm, thereby to permit change of length of the links to be accommodated without effecting any substantial movement of the nozzle-actuating member.
Claim 3
Dependent Claim
36 words
A turbine having a variable angle turbine nozzle actuating mechanism as claimed in claim 1 and means in which said lever is slidable in its own plane on a pivotally-mounted block supported on a fixed pivot.
Claim 4
Dependent Claim
44 words
A turbine having a variable angle turbine nozzle actuating mechanism as claimed in claim 2 in which said rocker arm is formed with a ball end slidable in a socket on said lever, the ball end and socket together forming a slidable knuckle joint.