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La eficiencia del par sinfín (50–90 %) es menor que la de engranajes cilíndricos: más calor y consumo. Factores clave:

1. Entradas y ángulo de avance
Más entradas = más eficiencia. Una entrada (~50–70 %) mantiene autobloqueo; dos (~70–85 %) rinden más pero pierden autobloqueo.
2. Materiales
Tornillo templado y rectificado; corona de bronce al estaño mejor que aluminio.

3. Lubricación
Película de aceite estable. Baño de aceite preferible a grasa en servicio continuo.
4. Precisión
Perfil y contacto uniformes reducen pérdidas.
5. Mejoras
Multi-entrada si no hay autobloqueo; temple/rectificado; bronce estaño; aceite correcto. Xinmi aconseja según el duty.