# TaperedRollerBearing

Specifies an analytical bearing that overtakes the radial and axial loads in one direction.

## Class Name

TaperedRollerBearing

## Description

The bearing is defined by the following dimensions:

## Attribute Summary

The table below summarizes the attributes of the TaperedRollerBearing classes.

Variable Type Notes Figure Symbol
id Int() The unique identification number of the bearing element.
label Str() The label of the bearing element.
rm Reference("Marker", required=True) The reference marker of the bearing element.

This marker points to the center of the bearing.

Defines the orientation of the bearing (z axis of reference marker is the bearing axial axis).

The positive z axis should be on the direction that the bearing carries the axial load, if it is loaded on inner ring (oriented to the left in the figure).

The rm part must always be on the housing of the system.

number_of_rollers Int(required=True) The number of rolling elements in the bearing.
pitch_diameter Double(required=True) The pitch diameter of the bearing. dp
contact_angle Double(required=True) The contact angle of the bearing.

Defined in degrees [deg].

a0
width_a Double() The pressure point distance. The default value is calculated internally as a function of pitch diameter, width_t and contact angle a
width_b Double() The inner ring width. The default value is calculated internally as a function of width_t. b
width_c Double() The outer ring width. The default value is calculated internally as a function of width_b. c
width_t Double(required=True) Total bearing width. t
inner_shoulder_diameter Double() Bearing inner shoulder diameter, as it shown on the above figure. The default value is calculated internally as a function of pitch diameter. d1
inner_diameter Double(required=True) The inner diameter of the bearing. d
inner_density Double() Default value is calculated internally with respect to the units of the system. AISI 52100 steel has been chosen as the default material.
outer_diameter Double(required=True) The outer diameter of the bearing. D
outer_density Double() The outer ring's density. Default value is calculated internally with respect to the units of the system. AISI 52100 steel has been chosen as the default material.
roller_diameter Double(required=True) The rolling element's diameter. dr
roller_length Double(required=True) The rolling element's length. L
roller_density Double() The rolling element's density. Cage part mass/inertia properties are calculated from rolling element's properties. Default value is calculated internally with respect to the units of the system. AISI 52100 steel has been chosen as the default material.
effective_roller_length Double(required=True) The rolling element effective length (the length that the contact occurs).
rotating_bearing Bool (True) A flag that defines if the bearing is assumed rotated (useful for identifying generating frequencies).
friction_torque Bool (False) A flag that activates the friction torque of the bearing.
simplified_graphics Bool (False) A flag that creates simplified rings in the bearing (useful for smaller files in design iterations).
damping_force Bool (True) A flag that activates the damping force in the bearing.
output_rm Reference("Marker") Defines the reference marker in which the output results are written.

This does not affect calculation reference marker.

The default value is the defined bearing reference marker (rm).

damping_factor Double(0.1) The damping factor of the bearing. This value must be in the range:
• (0. - 1.0)

bearing_k_factor Double(0.0) This factor expresses the ratio of the basic dynamic thrust load rating and basic dynamic radial load rating (Y/X)

where:

P = X · Fr + Y · Fa

is the basic dynamic equivalent radial load (example value X = 0.4, Y = 1.53, K = 3.825).

Change the default value for correct calculation of friction torque. (used for the friction torque calculation).

lubricant_viscosity Double(0.0) The lubricant viscosity of the bearing in [cSt].

Change the default value for correct calculation of friction torque (used for the friction torque calculation).

transition_velocity Double(0.1) The angular velocity which defines the transition phase of the friction torque. [rad/sec].
inner_connection_part Reference("Part", required=True) The part the inner ring is connected to.
outer_connection_part Reference("Part", required=True) The part the outer ring is connected to.
na Int(60) Parameter that defines the number of nodes in the perimeter of the ring's graphics.
nc Int(6) Parameter that defines the number of nodes in the raceway of the ring's graphics.
no Int(2) Parameter that defines the number of nodes in the width of the ring's graphics.

## Example

b = TaperedRollerBearing(
id=1,
label='bearing',
rm=Marker(part=ground),

number_of_rollers=19,
pitch_diameter=36.0,
contact_angle=16,

width_a=11.433,
width_b=15,
width_c=11.5,
width_t=15,

inner_shoulder_diameter=37.5,

inner_diameter=25.0,
inner_density=7.85e-06,

outer_density=7.85e-06,
outer_diameter=47.0,

roller_diameter=5.3,
roller_length=10.7,
roller_density=7.85e-06,

effective_roller_length=9.93,

rotating_bearing=True,
friction_torque=True,
damping_force=True,

damping_factor=0.1,
bearing_k_factor=3.5,
lubricant_viscosity=80,

inner_connection_part=b_shaft,
outer_connection_part=B_Ground,
)