Helical gear

Component kind helical-gear (category mech, DSL name helicalGear, API v1)

Cylindrical gear with teeth cut at a helix angle. Quieter engagement than a spur gear; meshes with another helical of the same normal module and equal helix angle with opposite hand on parallel axes via mech.helicalMesh.

Parameters

• `module` — Normal module m_n (mm per tooth, measured perpendicular to the tooth). Two meshing helicals must share the same normal module.
• `teeth` — Tooth count. Must be ≥ 4.
• `width` — Face width along the spin axis (mm).
• `boreDiameter` — Central bore diameter (mm), for mounting on a shaft.
• `helixAngle` — Helix angle β (deg), the tooth inclination relative to the axis. Typical 10–30°.
• `hand` — Helix hand: 'right' or 'left'. A mating pair must have opposite hands.
• `pressureAngle` — Tooth pressure angle (deg). Standard is 20°.

Parameters schema

Ports

Kinematics

Parallel-axis helical mesh: ω_driven = -ω_driver · (teeth_driver / teeth_driven). Same ratio as a spur mesh; the twist only changes geometry and engagement smoothness, not the tooth-count ratio.

Example

helicalGear "H1" {
  teeth: 20
  module: 2
  helixAngle: 15
  hand: 'right'
}

engine apiVersion · 1