Adams Car Package > Adams Driveline > Working with Components > Gear Forces

Gear Forces

 
Creating or Modifying Gear Forces
About Gear Forces
This component represents a gear couple. You can use it to model Spur Gears and Bevel Gears.
Learn about gear forces:

Creating or Modifying Gear Forces

To create or modify gear forces:

1. From the Driveline Components menu, point to Gear Force, and then select New/Modify.
2. Press F1 and then follow the instructions in the dialog box help for Gear Force.
3. Select OK.

About Gear Forces

The component consists of the following objects:
■Two general forces, featuring the actions exchanged between the gear meshes.
■A request to output force and torque values.
Adams Driveline calculates the forces and torques between the gears using a user-defined general force, whose action depends on the gear type.
To get reaction forces in the right direction, you must identify the orientation of the construction frames used to define the gear forces. The following figure shows how construction frames must be oriented. Notice that:
■The z-axis must be oriented along the rotation axis
■The x-axis has to point to the contact point
■The y-axis is located based on the x- and z-axes

Construction Frame Orientations

You can specify the parameters as shown next:
 
Parameter:
Description:
Gear type
Spur, bevel
Gear diameters
Pitch diameter (depending on geometries)
Backlash
Allowed angular backlash
Stiffness
Contact rotational stiffness
Damping
Contact rotational damping
Sharpness factor
Pressure angle a
--
Average gear radius for bevel gear
Taken from geometry
Adams Driveline calculates the transmitted torque for the gears using a backlash expression. (Torque is almost zero until the relative angular displacement, scaled by gear ratio, is lower than the specified lash, then the torque follows an elastic law.) Learn about rotational backlash.
The other torque and force components (radial and thrust) are derived from the transmitted torque expression and from the gear type.

Spur Gears

From the transmitted torque, Adams Driveline calculates the radial forces as follows:
where:
■Tz = Transmitted torque
■Rp = Gear primitive radius
■= Pressure angle

Bevel Gears

From the transmitted torque, Adams Driveline evaluates the radial and thrust forces expressions as follows:
where:
■Fx = Radial load
■Fz = Thrust load
■= Gear ratio