CylindricalRollerBearing
Model ElementSpecifies an analytical bearing that overtakes the primary radial load.
Class Name
CylindricalRollerBearing
Description
The bearing is defined by the following dimensions:
Figure 1.
Attributes
The table below summarizes the attributes of the CylindricalRollerBearing classes.
| Variable | Type | Notes | Symbol |
|---|---|---|---|
| id | Int() | Unique identification number. | |
| label | Str() | Descriptor 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 |
| 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 the pitch and outer diameters. | D1 |
| roller_diameter | Double(required=True) | The rolling element's diameter. | dr |
| roller_length | Double(required=True) | The rolling element's length. | L |
| 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). | |
| bearing_density | Double() | The density of the bearing parts. See Comment 2. | |
| roller_pass_frequency | Bool (True) | Defines if the bearing rotates with the inner and outer shaft. Default is set to True. Deactivating the rotation improves the computational performance, but neglects excitations caused by rollers passing through the loading zone. | |
| friction_torque | Bool (False) | Activates the friction torque in the bearing. | |
| simplified_graphics | Bool (False) | Creates simplified graphics for bearing rings and avoids graphics for rollers. This can reduce the H3D file size for large models. | |
| rollers_force_graphics | Bool (False) | Activates force vector graphics in the rolling elements. | |
| vec_gra_scale | Double(1.0) | Scales the rollers force vector graphics. | |
| damping_force | Bool (True) | Activates the damping force in the bearing. | |
| axial_constraint | Bool(False) | Activates an axial constraint between the inner and outer ring. This overcomes the lack of the reaction axial force from the ribs. | |
| output_rm | Reference("Marker") | Defines the reference marker where the output results are written. The default value is the defined bearing reference marker (rm). | |
| damping_ratio | Double(0.1) | The damping ratio of the bearings. This value must be between 0.0-1.0. | |
| lubricant_viscosity | Double(0.0) | The lubricant viscosity of the bearing in [cSt]. It is used in the friction torque calculation. | |
| lubrication_method | Enum
("grease oil_mist oil_bath oil_jet", default="grease") |
The lubrication method of the bearing. It is used in the friction torque calculation. | |
| transition_velocity | Double(0.1) | The angular velocity at which the friction torque takes full effect [rad/sec]. Friction is ramped up smoothly from 0 until the transition velocity for solver stability. | |
| inner_connection_part | Reference("Part", required=True) | The part/shaft that connects to the inner ring. See Comment 1. | |
| outer_connection_part | Reference("Part", required=True) | The part/shaft that connects to the outer ring. See Comment 1. | |
| na | Int(60) | Defines the number of nodes in the perimeter of the ring graphics. | |
| nc | Int(6) | Defines the number of nodes in the raceway of the ring graphics. | |
| no | Int(2) | Defines the number of nodes in the width of the ring 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,
outer_diameter=47.0,
outer_shoulder_diameter=38.8,
roller_diameter=5.5,
roller_length=5.67,
bearing_clearance=20e-3,
effective_roller_length=5.0,
bearing_density= 7.85e-06,
roller_pass_frequency=True,
friction_torque=True,
damping_force=True,
damping_ratio=0.1,
lubricant_viscosity=80,
lubrication_method='grease',
inner_connection_part=b_shaft,
outer_connection_part=B_Ground,
)