FCGear BevelGear
|
|
| Menu location |
|---|
| Gear → Bevel Gear |
| Workbenches |
| FCGear |
| Default shortcut |
| None |
| Introduced in version |
| v0.16 |
| See also |
| None |
Description
Partly because of the noise they generate, bevel gears are not used as often as other types of gear. But they are still used in certain sectors, such as food packaging and canned food, lawn and garden equipment, machines such as drills and mills, compression systems for the gas and oil market and flow control valves.
Spiral bevel gears have curved teeth to provide softer engagement and greater tooth to tooth contact compared to a straight bevel gear. This reduces the vibration and noise. They can be used at high speeds and are typically used in motorcycle and bicycle transmissions.
From left to right: Spur gearing, spiral gearing
Usage
- Switch to the
FCGear Workbench. - There are several ways to invoke the command:
- Press the
Bevel Gear button in the toolbar. - Select the Gear → Bevel Gear option from the menu.
- Press the
- Change the gear parameter to the required conditions (see Properties).
Properties
An FCGear BevelGear object is derived from a Part Feature object and inherits all its properties. It also has the following additional properties:
Data
base
- Dataheight (
Length): Default is5. Value for the bevel gear width. - Datamodule (
Length): Default is1. Module is the ratio of the reference diameter of the gear divided by the number of teeth (see Notes). - Datareset_origin (
Bool): Iftrue(default) the center of the axis is at the center of the bottom of the gear (see Notes). - Datateeth (
Integer): Default is15. Number of teeth.
computed
- Dataangular_backlash (
Angle): (read-only) - Datadw (
Length): (read-only) Working pitch diameter.
helical
- Databeta (
Angle): Default is0 °. With the helix angle β a helical bevel gear is created – positive value → rotation direction right, negative value → rotation direction left.
involute
- Datapitch_angle (
Angle): Default is45 °. Angle of taper.
involute_parameter
- Datapressure_angle (
Angle): Default is20 °(see Notes).
precision
- Datanumpoints (
Integer): Default is6. Change of the involute profile. Changing the value can lead to unexpected results.
tolerance
- Databacklash (
Length): Default is0. Backlash, also called lash or play, is the distance between the teeth at a gear pair. - Dataclearance (
Float): Default is0.1(see Notes).
version
- Dataversion (
String):
Notes
- clearance: At a gear pair, clearance is the distance between the tooth tip of the first gear and the tooth root of the second gear.
- 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.
- reset_origin: It can be advantageous for mounting purposes if the parameter is set to false. The origin of the body is then at the tip of the pitch cone.
- pressure_parameter: Only change the parameter, if sufficient knowledge of the gear geometry is available.
Useful formulas
- pitch diameter = module * teeth
- addendum diameter = pitch diameter + 2 * module * cos reference cone angle
- tip angle 1 = (teeth 1 + 2) * (cos reference cone angle 1) : (teeth 2 - 2) * (sin reference cone angle 1)
- tip angle 2 = (teeth 2 + 2) * (cos reference cone angle 2) : (teeth 1 - 2) * (sin reference cone angle 2)
- reference cone angle 1 = (teeth 1) : (teeth 2)
- reference cone angle 2 = (teeth 2) : (teeth 1)
- axis angle total = reference cone angle 1 + reference cone angle 2
Substantive reference cone angle [TECH.]