CylindricalRollerBearing
Specifies an analytical bearing that overtakes the primary radial load.
Class Name
CylindricalRollerBearing
Description
The bearing is defined by the following dimensions:
Figure 1.
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:
|
|
| 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,
)