# CylindricalRollerBearing

## Class Name

CylindricalRollerBearing

## Description

The bearing is defined by the following dimensions:

## Attribute Summary

The table below summarizes the attributes of the CylindricalRollerBearing 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 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
width Double(required=True) The width of the bearing. b
inner_diameter Double(required=True) The inner diameter of the bearing. d
inner_shoulder_diameter Double() The inner ring shoulder diameter. The default value is calculated internally as a function of pitch and inner diameters. d1
inner_density Double() The inner ring density. 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_shoulder_diameter Double() The outer ring shoulder diameter. The default value is calculated internally as a function of pitch and outer diameters. D1
outer_density Double() The outer ring 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 the 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.
bearing_clearance Double(0.0) The bearing radial clearance.

Apply the correct clearance for each bearing.

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.
axial_constraint Bool(False) A flag that activates an axial constraint between inner and outer ring. This overcomes the lack of the reaction axial force from the ribs.
output_rm Reference("Marker") Defines the reference marker in which the output results are written.

This does not affect the calculation reference marker.

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

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

lubricant_viscosity Double(0.0) The lubricant viscosity of the bearing in [cSt]. Change the default value for the correct calculation of the friction torque (used for the friction torque calculation).
lubrication_method Enum ("grease

oil_mist

oil_bath

oil_jet",

default="grease")

The lubrication method of bearing (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 = CylindricalRollerBearing(
id=1,
label='bearing',
rm=Marker(part=ground),

number_of_rollers=12,
pitch_diameter=36,
width=13.0,

inner_diameter=25.0,
inner_shoulder_diameter=30.5,
inner_density=7.85e-06,

outer_density=7.85e-06,
outer_diameter=47.0,
outer_shoulder_diameter=38.8,

roller_diameter=5.5,
roller_length=5.67,
roller_density=7.85e-06,

bearing_clearance=20e-3,
effective_roller_length=5.0,

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

damping_factor=0.1,
lubricant_viscosity=80,
lubrication_method='grease',

inner_connection_part=b_shaft,
outer_connection_part=B_Ground,
)