The pitch change mechanism , Other Engineering

Assignment Help:

THE PITCH CHANGE MECHANISM :

The cylinder backplate. The disc shaped backplate provides a mounting for the pitch change cylinder. This backplate fits in front of the propeller hub and it has four clearance holes to permit movement of the operating link assembly for the blades. It is secured to the hub by the transfer sleeve housing which screws into the hub and is locked by the washer as shown below.

208_THE PITCH CHANGE MECHANISM.png


Transfer sleeve housing. One end of the sleeve is screwed into the hub so that the sleeve surrounds the front end of the oil tubes. The sleeve flange which secures the cylinder backplate against the front of the hub, has slots to accept the spanner used for fitting or removing the sleeve housing. A ring of holes is drilled through the wall of the sleeve, just in front of the external flange. These holes transfer governor pressure oil to the rear side of the pitch change piston which slides upon the outer surface of the sleeve.

2409_THE PITCH CHANGE MECHANISM2.png

The cylinder . The shaped cylinder is flanged and drilled at the rear for mating with, and bolting to, the cylinder backplate. The cylinder provides a working surface for the pitch change piston and a shoulder towards the front forms one part of the ground fine pitch stop. The front of the cylinder is bored to obtained access to the propeller retaining nut and to permit fitting of the pitch lock mechanism. The mouth of the bore screw threaded internally to match the lock retaining nut and the pitch change cylinder is sealed by the pitch lock cylinder cover which beds onto a seal and is secured in position by a ring nut, locking plate and circlip. Finally, a screwed plug is fitted to the hole in the centre of the pitch lock cylinder cover.

2220_THE PITCH CHANGE MECHANISM3.png

Blade operating link assembly. The operating link assembly provides the means of converting the axial movement of the piston into rotary movement to turn each blade around its axis so that the blade angle is changed by pitch change piston movement. The assembly consists of an eyebolt sleeve, eyebolt and an operating link. Each eyebolt fits inside an eyebolt sleeve which provides a working surface in the bushed hub shell. The front end of each eyebolt is secured to the pitch change piston and its rear end is attached to the front of an operating link by a pivot or link pin. The bushed rear end of each operating link fits snuggly over a pin attached to the root end face of a propeller blade. Slots in the rear of each eyebolt and sleeve allow for articulation of the operating link caused by the radial movement of the blades as the pitch change piston moves forward and backwards in its cylinder.


Related Discussions:- The pitch change mechanism

Diffraction, Q.  What do you mean by diffraction? Distinguish between Fres...

Q.  What do you mean by diffraction? Distinguish between Fresnel's and Fraunhofer's classes of diffraction. Ans. The phenomena of diffraction in case of light was first observ

Inlet duct arrangement in aircraft engine, Inlet duct arrangement in Aircra...

Inlet duct arrangement in Aircraft Engine: Wherever the APU is located, ducting will be required to bring air to the APU inlet. In figure 18.9. we can see that the inlet duct

Show down any banking products and services offered, Question: a) E-b...

Question: a) E-banking is defined as the automated delivery of new and traditional banking products and services directly to customers through electronic, interactive commun

Iosipescu shear test, A second way to determine the shear modulus is to use...

A second way to determine the shear modulus is to use the Isopescu shear test. The sample is placed in a jig and loaded as shown. Under load, a region of pure shear exists

Information, hi there i wonder if you could help me with this quistion? whe...

hi there i wonder if you could help me with this quistion? where would i find information specifying the minimum conductor size for electrial circuits can be obtained from A. BS76

Assembly buildings - common fault, Assembly buildings - fire risk assessmen...

Assembly buildings - fire risk assessment: Common faults found in assembly buildings are: Combustible items left in protected routes or bedroom corridors Locked exi

Flight control - characteristic equation, characteristic equation The c...

characteristic equation The characteristic equation (C.E.) corresponding to the linear state space equations comprising the state equation? x = Ax + Bu and output equatio

Financial strategy and operations, Q. A. Microfinance case How would you va...

Q. A. Microfinance case How would you value the price of a Microfinance Institution? Using data available on the net, explain what would you consider the value of SKS (India) or Co

TANGENT GALVANOMETER, WHY THE NEEDLE OF TANGENT GALVANOMETER DEFLECT WITH I...

WHY THE NEEDLE OF TANGENT GALVANOMETER DEFLECT WITH INCREASING OR DECREASING CURRENT?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd