|
|
| Menu location |
|---|
| Gear → Timing Gear |
| Workbenches |
| FCGear |
| Default shortcut |
| None |
| Introduced in version |
| v0.16 |
| See also |
| None |
Описание
Назначение ременной передачи газораспределительного механизма (сокращенно ГРМ) состоит в том, чтобы позволить распределительному и коленчатому валу вращать цепь ГРМ. Коленчатый вал вращается, перемещая поршни вверх и вниз внутри цилиндров. Распределительный вал поворачивается, позволяя впускным и выпускным клапанам на цилиндрах открываться и закрываться. Эти компоненты важны для правильного газораспределения внутри двигателя внутреннего сгорания.
Timing gears are connected to a timing belt or timing chain.
Above: Timing gear
Usage
- Switch to the
FCGear Workbench. - There are several ways to invoke the command:
- Press the
Timing Gear button in the toolbar. - Select the Gear → Timing Gear option from the menu.
- Press the
- Change the gear parameter to the required conditions (see Properties).
Properties
An FCGear TimingGear object is derived from a Part Feature object and inherits all its properties. It also has the following additional properties:
Data
base
- Данныеheight (
Length): Default is5 mm. Value of the gear width. - Данныеteeth (
Integer): Default is15. Number of teeth. - Данныеtype (
Enumeration): Default isgt2. Type of timing gear – profile pitch for timing belts (see Notes).
computed
- Данныеh (
Length): (read-only) Radial height of teeth. - Данныеoffset (
Length): (read-only) X-Offset of second arc mid-point. - Данныеpitch (
Length): (read-only) Pitch of gear. - Данныеr0 (
Length): (read-only) Radius of first arc. - Данныеr1 (
Length): (read-only) Radius of second arc. - Данныеrs (
Length): (read-only) Radius of third arc. - Данныеu (
Length): (read-only) Radial difference between pitch … diameter and head of gear.
version
- Данныеversion (
String):
Notes
- type: The pitch of the timing belts (distance from tooth centre to tooth centre of consecutive teeth) is specified in types. GT2 has a pitch of 2 mm, GT3 of 3 mm, GT5 of 5 mm etc..
Useful formulas
- addendum diameter = pitch diameter + 2 * module
- belt length = 2 * axle base + belt tooth pitch : 2 * (teeth 1 + 2) + belt tooth pitch² : 4 * pi² * axle base * (teeth 1 - 2)²
- axle base = belt length : 4 - belt tooth pitch : 8 * (teeth 1+2) + ¼ * sqrt [belt length - ½ * belt tooth pitch * (teeth 1+2)² - 2 * belt tooth pitch² * (teeth 1+2)² : pi²]
Эта страница получена от https://wiki.freecad.org/FCGear_TimingGear