Drivetrain Hub | Gears App
Gears App is designed to make the modeling process easy, intentionally limiting the amount of fidelity required to model and simulate a system of gears. A functionality where this philosophy can be noticed is in the modeling of constraints, i.e. the relationships between parts.
Two key rules exist for part constraints:
- All parts are free to rotate, unless specified otherwise.
- All parts are in the ground reference frame, unless specified otherwise.
For item (1), this means a revolute constraint implicitly exists between each part and its reference frame, i.e. as though it is mounted on a bearing. For item (2), any part can be moved to the reference frame of another part. This is typically done for the following use cases:
- Mounting a gear to a shaft.
- Mounting a gear to a carrier.
For item (a), it is likely a weld or clutch constraint will be needed between the gear and shaft, depending on your gearbox architecture. For item (b), this approach is required to correctly model a planet gear that precesses with a planetary carrier.