Create Planetary Gear

If Simplified method is selected, the following options will be displayed:

Set Name

Enter the planetary gear set name.

Center Location

Enter the coordinates or Pick (Markers, View location and so on.)

Axis of Rotation

Axis of Rotation can be one of the following:

Module (Normal)

Enter a value for the module expressed in the normal plane.

Pressure Angle (Normal)

Enter a nominal pressure angle in current modelling. Units (default value = 20.0 deg) expressed in the normal plane.

Helix Angle

Enter a value for the helix angle (beta) in current modelling. Units expressed at the pitch circle (default value = 20.0 deg). Note that the sign of the helix angle will decide the rotation of the helicoid (right/left).

Gear Width

Enter value for Gear Width (same width will be used of sun, planets and ring gear).

Planet gears

Enter the number of Planetary Gears. (Maximum number of planets = 6)

Number of Teeth

Sun Gear

Enter the number of teeth for the sun gear.

Ring Gear

Enter the number of teeth for the ring gear.

Planet Gear

Enter the number of teeth for the planet gear.

Pair

Backlash

Select if backlash should be specified as an angular or linear value. The backlash is the difference between the circle thickness of one gear and the tooth space of the mating gear.

Sun - Planet

Enter value for backlash between sun gear and planetary gears. If backlash type is set to angle, the backlash is measured by turning the sun gear.

Planet - Ring

Enter value for backlash between planetary gears and ring gear. If backlash type is set to angle, the backlash is measured by turning the planetary gears.

Bore/Ring Radius

Sun Gear

Enter the radius for the hole in the sun gear (only used for graphics).

Ring Gear

Enter the outer radius of the ring gear (only used for graphics).

Planet Gear

Enter the radius for the hole in the planet gear (only used for graphics).

If 3D Contact/Detailed method is selected, the following options will be displayed:

Set Name

Enter the planetary gear set name.

Center Location

Enter the coordinates or Pick (Markers, View location and so on.)

Axis of Rotation

Axis of Rotation can be one of the following:

Pressure Angle (Normal)

Enter a nominal pressure angle in current modelling. Units (default value = 20.0 deg) expressed in the normal plane.

Module (Normal)

Enter a value for the module expressed in the normal plane.

Helix Angle

Enter a value for the helix angle (beta) in current modelling. Units expressed at the pitch circle (default value = 20.0 deg). Note that the sign of the helix angle will decide the rotation of the helicoid (right/left).

Gear Width

Enter value for Gear Width (same width will be used of sun, planets and ring gear).

Planet Gear

Enter the number of Planetary Gears.

Bore/Ring Radius

Sun Gear

Enter the radius for the hole in the sun gear (only used for graphics).

Ring Gear

Enter the outer radius of the ring gear (only used for graphics).

Planet Gear

Enter the radius for the hole in the planet gear (only used for graphics).

Profile

Select how the involute profile should be described using the Standard Involute Profile parameters (Profile Shifting, Addendum Factor & Dedendum Factor) or if the parameters for the Modified Involute Profile (Tip Radius, Root Radius & Tooth Thickness) should be used.

If Standard profile is selected, the following options will be displayed:

No. of Teeth

Enter the number of teeth of planetary gear set.

Profile Shift Coeff.

Enter a value for Profile Shift Coefficient (positive or negative value). Default value = 0.0. If this field is left blank, no profile shifting will be used.

Addendum Factor

Enter a value for the addendum factor.

Dedendum Factor

Enter a value for the dedendum factor.

If Modified profile is selected, the following options will be displayed:

No. of Teeth

Enter the number of teeth.

Tooth Thick

Enter a value for the tooth thickness at the pitch circle. Must be less than 10 times the value of module. For module = 2, tooth thickness needs to be <20, not 0.2.

Tip Radius

The addendum circle, or outside circle, is the circle that contains the tips of the teeth, and its radius is the outside radius (tip radius). In the database navigator this will appear as 'tip_rad'.

Root Radius

The dedendum circle, or root circle, is the circle that contains the ends of the tooth spaces, and its radius is the root radius (foot radius). In the database navigator this will appear as 'foot_rad'.

Tooth Modification Parameters for Sun and Planet Gears

Tip Relief Start

Tip relief is a modification of a tooth profile whereby a small amount of material is removed near the tip of the gear tooth.

The Tip Relief Start parameter defines the position on the tooth at which the Tip Relief will start. The resulting starting radius on the gear will be:

The Module (Transverse), MT is defined as below:

If the gear is defined by Standard Involute Profile, the Tip Radius is defined as below:

Tip Relief Coefficient

This coefficient defines the maximum Tip Relief reached at the Tip Radius of the gear. The Tip Relief is defined by:

The tip relief will have zero value at the Tip Relief Start point and increase linearly out to the Tip Radius.

Crown Magnitude

Crowning is the removal of a slight amount of tooth from the center on out to reach edge, making the tooth surface slightly convex. This method allows the gear to maintain contact in the central region of the tooth and permits avoidance of edge contact with consequent lower load capacity. Crowning also allows a greater tolerance in the misalignment of gears in their assembly, maintaining central contact.

The crown magnitude is reached at the edges of the tooth and crowning is zero at the center of the tooth. The crowning is described as an arc.

The Crown Magnitude is entered in length units.

Geometry Settings