F01C ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES (internal-combustion aspects F02B53/00, F02B55/00)
Description
F01C encompasses rotary-piston and oscillating-piston machines that convert fluid pressure or thermal energy into mechanical motion through rotational or reciprocating movement of pistons around a central axis or pivot point. This subclass covers various positive-displacement pump and motor designs, including Wankel engines, rotating vane machines, radial and axial piston units, and swashplate mechanisms. It excludes reciprocating engines with linear piston motion (classified in F01B) and turbomachines (classified in F01D), but includes both compressors and expanders operating on these piston principles across hydraulic, pneumatic, and internal combustion applications.
11 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- F01C 1/00 Rotary-piston machines or engines (with axes of co-operating members non parallel F01C3/00; with the working-chamber walls at least partly resiliently deformable F01C5/00; with fluid ring or the like F01C7/00; rotary-piston machines or engines in which the working fluid is exclusively displaced by, or exclusively displaces, one or more reciprocating pistons F01B13/00)
- F01C 11/00 Combinations of two or more machines or engines, each being of rotary-piston or oscillating-piston type (F01C13/00 takes precedence; combinations of two or more pumps F04; fluid gearing F16H)
- F01C 13/00 Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01C 17/00 Arrangements for drive of co-operating members, e.g. for rotary piston and casing
- F01C 19/00 Sealing arrangements in rotary-piston machines or engines (sealings in general F16J)
- F01C 20/00 Control of, monitoring of, or safety arrangements for, machines or engines
- F01C 21/00 Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C 3/00 Rotary-piston machines or engines with non-parallel axes of movement of co-operating members (with the working-chamber walls being at least partly resiliently deformable F01C5/00)
- F01C 5/00 Rotary-piston machines or engines with the working-chamber walls at least partly resiliently deformable
- F01C 7/00 Rotary-piston machines or engines with fluid ring or the like
- F01C 9/00 Oscillating-piston machines or engines
Top Applicants
Top 10 applicants by patent filingsfor class F01, 2013–2023, worldwide · Source: EPO PATSTAT
- GE (GENERAL ELECTRIC COMPANY) US 9,989
- UNITED TECHNOLOGIES CORPORATION (UTC) US 8,110
- SAFRAN AIRCRAFT ENGINES FR 6,248
- HYUNDAI MOTOR COMPANY KR 4,530
- SIEMENS DE 4,461
- FORD GLOBAL TECHNOLOGIES US 4,029
- RAYTHEON TECHNOLOGIES CORPORATION US 3,947
- TOYOTA MOTOR CORPORATION JP 3,734
- GE (GENERAL ELECTRIC COMPANY) 3,415
- SCHAEFFLER TECHNOLOGIES & COMPANY DE 3,063