Getting Started Tutorials - MechDesigner > Tutorial 14: Gear-Pairs / Rack-Pinions

A: Gear-Pairs with Fixed Centers

A Gear-Pair in which each gear has a Fixed Center:

•Both gears rotate about their own centers.

•The centers are fixed to the Base-Part, but not necessarily.

Gears with fixed-centers are:

•Simple Gear-Pairs (also known as Parallel or Standard Gears)

•Simple Gear-Trains - two or more Gear-Pairs

Use gears with fixed-centers to:

•Increase or decrease the torque and speed of a shaft

•Change the rotational direction of a shaft

•Change the position of a shaft

Combine Gears with a mechanism to get:

•Function-Generation: from Geared Four-bar and Five-bars

Simpe Gear Pair - External Mesh

External Mesh

In the schematic:

Gear 1 : rotates on a fixed-center

Gear 2 : rotates on a fixed-center

Line-of-center : a Line between the two fixed-centers. It is a Line in the Base-Part.

Simple Gear Pair - Internal Mesh

Internal Mesh

In the schematic:

Gear 1 : rotates on a fixed-center

Gear 2 : rotates on a fixed-center

Line-of-center : Line between the two fixed-centers. It is a Line in the Base-Part.