# US 12,180,884 B2 · Rotary engine rotor and method

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- Number: US 12,180,884 B2
- Document ID: US12180884B2
- Status: Granted
- Kind: B2
- Application number: 17/976,498
- Filed: 2022-10-28
- Published: 2024-05-02
- Granted: 2024-12-31
- Earliest claimed: 2022-10-28
- Assignees: Pratt & Whitney Canada Corp.
- Applicants: Pratt & Whitney Canada Corp.
- Inventors: Etienne Plamondon; Michel Bousquet; Ninad Joshi; Vincent Savaria
- Web page: https://patentgrep.com/patent/US12180884B2

## CPC

- F02B 55/02: Pistons
- F01C 1/22: of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth- equivalents than the outer member
- F01C 21/08: Rotary pistons (reciprocating pistons in general F16J)
- F02B 53/04: Charge admission or combustion-gas discharge
- F02B 55/14: Shapes or constructions of combustion chambers
- F02B 2053/005: {Wankel engines}
- F04C 2240/802: Liners
- F04C 2250/20: of the rotor
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- F01C: ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES (internal-combustion aspects F02B53/00, F02B55/00)
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS

## Abstract

A rotary engine rotor and a method for supplying rotary engine rotors are provided. The rotary engine rotor has a center axis, a rotor body, a plurality of peripheral surfaces, and a plurality of recess members. The rotor body has a central bore that extends along the center axis. The plurality of peripheral surfaces are disposed around an exterior perimeter of the rotor body. Each of the plurality of recess members are disposed in a respective one of the plurality of peripheral surfaces. Each recess member includes an interior cavity open to an exterior of the rotor.

## Claims

### Claim 1

A rotor for a rotor, comprising:
a rotor body having:
a plurality of peripheral surfaces disposed around an exterior perimeter of the rotor body;
a plurality of seats, each respective seat disposed in a respective peripheral surface; and
a plurality of recess members, each said recess member a structure independent of the rotor body, and each said recess member is attached to the rotor body;
wherein the rotor is configurable in a first configuration and a second configuration;
in the first configuration the plurality of recess members are first recess members, each said first recess member having a first interior cavity open to an exterior of the rotor body, the first interior cavity having a first geometric configuration; and
in the second configuration the plurality of recess members are second recess members, each said second recess member having a second interior cavity open to the exterior of the rotor body, the second interior cavity having a second geometric configuration;
wherein the first geometric configuration is different from the second geometric configuration, and wherein the first geometric configuration is based on combustion of a first fuel type, and the second geometric configuration is based on combustion of a second fuel type, and the first fuel type and the second fuel type are different; and
wherein each said seat is configured to interchangeably receive a respective first recess member or a respective second recess member, and in the first configuration of the rotor each respective seat receives a respective first recess member, and in the second configuration of the rotor each respective seat receives a respective second recess member.

### Claim 2 (depends on 1)

The rotor of claim 1, wherein each said recess member is removably attached to the rotor body.

### Claim 3 (depends on 1)

The rotor of claim 1, wherein the plurality of peripheral surfaces includes a first peripheral surface, a second peripheral surface, and a third peripheral surface.

### Claim 4 (depends on 3)

The rotor of claim 3, wherein the rotor body includes a first axial end surface and a second axial end surface, spaced apart from one another, and the plurality of peripheral surfaces extend between the first axial end surface and the second axial end surface, and a central bore extends between the first axial end surface and the second axial end surface.

### Claim 5

A rotor for a rotor, comprising:
a rotor body having:
a plurality of peripheral surfaces disposed around an exterior perimeter of the rotor body;
a plurality of seats, each respective seat disposed in a respective peripheral surface; and
a plurality of recess members, each said recess member a structure independent of the rotor body, and each said recess member is attached to the rotor body;
wherein the rotor is configurable in a first configuration and a second configuration;
in the first configuration the plurality of recess members are first recess members, each said first recess member having a first interior cavity open to an exterior of the rotor body, the first interior cavity having a first geometric configuration; and
in the second configuration the plurality of recess members are second recess members, each said second recess member having a second interior cavity open to the exterior of the rotor body, the second interior cavity having a second geometric configuration;
wherein the first geometric configuration is different from the second geometric configuration, and wherein the first geometric configuration defines a first volume, and the second geometric configuration defines a second volume, and the first volume and the second volume are different; and
wherein each said seat is configured to interchangeably receive a respective first recess member or a respective second recess member, and in the first configuration of the rotor each respective seat receives a respective first recess member, and in the second configuration of the rotor each respective seat receives a respective second recess member.

### Claim 6 (depends on 5)

The rotor of claim 5, wherein each said recess member is removably attached to the rotor body.

### Claim 7 (depends on 5)

The rotor of claim 5, wherein the plurality of peripheral surfaces includes a first peripheral surface, a second peripheral surface, and a third peripheral surface.

### Claim 8 (depends on 7)

The rotor of claim 7, wherein the rotor body includes a first axial end surface and a second axial end surface, spaced apart from one another, and the plurality of peripheral surfaces extend between the first axial end surface and the second axial end surface, and a central bore extends between the first axial end surface and the second axial end surface.