FCGear CrownGear/en

Description
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.

Known field of application of crown gears:


 * Rear axle drives for cars and motorcycles
 * Swivel mechanism for operating tables
 * Angular milling heads
 * Powered tool systems with multiple pinions and a crown gear



Usage

 * 1) Switch to the [[Image:FCGear_workbench_icon.svg|16px]] FCGear Workbench.
 * 2) There are several ways to invoke the command:
 * 3) * Press the button in the toolbar.
 * 4) * Select the option from the menu.
 * 5) The crown gear is displayed without teeth by default.
 * 6) Change the gear parameters to the required conditions (see  below).
 * 7) Set the  property to  to display the teeth (see notes below).

Properties
An FCGear CrownGear object is derived from a Part Feature object and inherits all its properties. It also has the following additional properties:

Data

 * : Number of profiles used for loft.


 * : Value for the tooth width.
 * : Module is the ratio of the reference diameter of the gear divided by the number of teeth (see also the information in ).
 * : Number of teeth of the gear (pinion). See also the information in.
 * : Number of teeth
 * : Height from the tip of tooth to the lower side of the crown wheel.


 * : Default is 20° (see also the information in ).



Crown and spur gear set overview



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

Useful formulas

 * Inner diameter (4)


 * Outer diameter (5)