Fretting resistant rotary engine housings
AssigneePratt & Whitney Canada Corp.
InventorsVincent Savaria, Jean-Philippe Simoneau
Life of this patent
Estimating the term…
Abstract
A rotary internal combustion engine includes a main rotor housing that has a peripheral wall that circumscribes a rotor cavity, a first interface surface and a second interface surface. A rotor is disposed within the rotor cavity. First and second side housings are secured against corresponding first and interface surfaces of the main rotor housing. The main rotor housing, the first side housing and the second side housing are formed from an aluminum alloy and at least one of the first interface surface and the second interface surface include an anti-fretting coating.
Claims20
A method of assembling a rotary internal combustion engine comprising:
- forming at least a main rotor housing, a first side housing and a second side housing from an aluminum alloy;
- forming a first side plate and a second side plate;
- selecting interface surfaces between at least the main rotor housing, the first side housing, the second side housing, the first side plate and the second side plate;
- masking non-selected surface of the each of the at least the main rotor housing, the first side housing, the second side housing, the first side plate and the second side plate;
- and
- applying an anti-fretting coating to the selected interface surfaces, wherein the rotary internal combustion engine further comprises a first bearing support and a second bearing support that abut against an inner bore surface of a corresponding one of the first side housing and the second side housing, and the method further comprises applying an anti-fretting coating to the inner bore surface of each of the first side housing and the second side housing.
A method of configuring a rotary internal combustion engine comprising:
- configuring a main rotor housing to have a peripheral wall circumscribing a rotor cavity, a first interface surface and a second interface surface;
- configuring a rotor for operation within the rotor cavity;
- configuring a first side housing for securement against the first interface surface of the main rotor housing;
- configuring a second side housing for securement against the second interface surface of the main rotor housing, wherein the main rotor housing, the first side housing and the second side housing are formed from an aluminum alloy and at least one of the first interface surface and the second interface surface are configured to includes an anti-fretting coating;
- configuring a first side plate to be partially disposed within a clearance space between the first side housing and the main rotor housing;
- configuring a second side plate to be partially disposed within a clearance space disposed between the second side housing and the main rotor housing, wherein each of the first side plate and the second side plate are further configured to define a running surface for the rotor;
- and
- configuring a first transfer housing and a second transfer housing to each include a radially outer surface abutting a corresponding inner radial face surface of one of the first side housing and the second side housing;
- and
- configuring each of the corresponding inner face surfaces of the first side housing and the second side housing to receive an anti-fretting coating.
A method of assembling a rotary internal combustion engine comprising:
- forming at least a main rotor housing, a first side housing and a second side housing from an aluminum alloy;
- forming a first side plate and a second side plate;
- selecting interface surfaces between at least the main rotor housing, the first side housing, the second side housing, the first side plate and the second side plate;
- masking non-selected surface of the each of the at least the main rotor housing, the first side housing, the second side housing, the first side plate and the second side plate;
- applying an anti-fretting coating to the selected interface surfaces;
- and
- forming a recess on at least one of the selected interface surfaces prior to application of the anti-fretting coating, wherein the recess is formed to correspond with a final thickness of the anti-fretting coating.
Dependencies are inferred from the claim text.