FCGear CrownGear/it: Difference between revisions

From FreeCAD Documentation
(Created page with "Un oggetto FCGear CrownGear deriva da un oggetto Part Feature e ne eredita tutte le proprietà. Ha inoltre le seguenti proprietà aggiuntive:")
(Created page with "* Azionamenti dell'asse posteriore per auto e moto * Meccanismo girevole per tavoli operatori * Teste per fresatura angolare * Sistemi di utensili motorizzati con pignoni multipli e corona dentata")
Line 27: Line 27:
Campi di applicazione noti per le corone dentate:
Campi di applicazione noti per le corone dentate:


* Azionamenti dell'asse posteriore per auto e moto
* Rear axle drives for cars and motorcycles
* Meccanismo girevole per tavoli operatori
* Swivel mechanism for operating tables
* Teste per fresatura angolare
* Angular milling heads
* Sistemi di utensili motorizzati con pignoni multipli e corona dentata
* Powered tool systems with multiple pinions and a crown gear


[[File:Crown-Gear_example.png]]
[[File:Crown-Gear_example.png]]

Revision as of 15:16, 25 May 2024

Other languages:

Corona dentata

Posizione nel menu
Gear → Crown Gear
Ambiente
FCGear
Avvio veloce
None
Introdotto nella versione
v0.16
Vedere anche
Ingranaggio ad evolvente

Descrizione

The crown wheel resembles a ring-shaped curved rack. The pressure angle decreases continuously from the outer to the inner diameter. Thus, the variable peripheral speed at the crown wheel is compensated against the constant peripheral speed of the pinion. The pointed outer teeth and the steep tooth flanks on the inner diameter limit the usable tooth width. Crown gears achieve similar efficiencies as spur gears. One crown gear can drive several pinions.

Campi di applicazione noti per le corone dentate:

  • Azionamenti dell'asse posteriore per auto e moto
  • Meccanismo girevole per tavoli operatori
  • Teste per fresatura angolare
  • Sistemi di utensili motorizzati con pignoni multipli e corona dentata

Sopra: corona dentata

Utilizzo

  1. Switch to the FCGear Workbench.
  2. There are several ways to invoke the command:
    • Press the Crown Gear button in the toolbar.
    • Select the Gear → Crown Gear option from the menu.
  3. The crown gear is displayed without teeth by default. (introduced in version 0.21)
  4. Change the gear parameters to the required conditions (see Properties).
  5. Set the Datipreview_mode property to false to display the teeth (see Notes).

Proprietà

Un oggetto FCGear CrownGear deriva da un oggetto Part Feature e ne eredita tutte le proprietà. Ha inoltre le seguenti proprietà aggiuntive:

Dati

accuracy

  • Datinum_profiles (Integer): Default is 4. Number of profiles used for loft.
  • Datipreview_mode (Bool): Default is true.

base

  • Datiheight (Length): Default is 2 mm. Value for the tooth width.
  • Datimodule (Length): Default is 1 mm. Module is the ratio of the reference diameter of the gear divided by the number of teeth (see Notes).
  • Datiother_teeth (Integer): Default is 15. Number of teeth of the construction gear (pinion) (see Notes).
  • Datiteeth (Integer): Default is 15. Number of teeth.
  • Datithickness (Length): Default is 5 mm. Height from the tip of tooth to the lower side of the crown wheel.

involute

  • Datipressure_angle (Angle): Default is 20 ° (see Notes).

version

  • Dativersion (String):

Note

  • The Datipreview_mode property is set to true by default and when the gear is created you'll find this message in the report view:
    Gear module: Crown gear created, preview_mode = true for improved performance. Set preview_mode property to false when ready to cut teeth.
  • module: Using ISO (International Organization for Standardization) guidelines, Module size is designated as the unit representing gear tooth-sizes. Module (m): m = 1 (p = 3.1416), m = 2 (p = 6.2832), m = 4 (p = 12.566). If you multiply Module by Pi, you can obtain Pitch (p). Pitch is the distance between corresponding points on adjacent teeth.
  • other_teeth: Several pinions with the same number of teeth only can be used on one crown wheel.
  • pressure_parameter: Only change the parameter, if sufficient knowledge of the gear geometry is available.
  • The geometry of the crown gear is primarily determined by the spur pinion geometry (other_teeth).
  • Create spur gear with Involute gear. The number of teeth must be identical to the parameter other_teeth of the crown gear.
  • Adjustments for optimal running characteristics can be made with the parameters of involute gear.

Panoramica dell'insieme corona e ingranaggio cilindrico

  • (1) Spur gear
  • (2) Crown gear
  • (3) Tooth width
  • (4) Inner diameter
  • (5) Outer diameter

Formule utili

  • Inner diameter (4)
    • inner diamter = module (spur gear) * teeth (crown gear) * cos pressure_paramter (pinion) : cos pressure_parameter (crown gear)
  • Outer diameter (5)
    • outer diamter = inner diameter + 2x height (tooth width crown gear)