AngularContactBallBearing
Model ElementSpecifies an analytical bearing that overtakes radial and axial loads in one direction.
Class Name
AngularContactBallBearing
Description
The bearing is defined by the following dimensions:
Figure 1.
Attributes
The table below summarizes the attributes of the AngularContactBallBearing 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 positive z axis should be on the direction that 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 |
| width | Double(required=True) | The width of the bearing. | b |
| contact_angle | Double(required=True) | The contact angle of the bearing. Defined in degrees [deg]. | a0 |
| contact_length_a | Double() | Distance from one face of the bearing to the intersection point of the rolling element's contact line and bearing axis. The default value is calculated internally as a function of the pitch diameter, width, and contact angle. | a |
| inner_diameter | Double(required=True) | The inner diameter of the bearing. | d |
| inner_shoulder_diameter_1 | Double() | The large shoulder diameter of the inner ring. The default value is calculated internally as a function of the pitch and roller diameters. | d1 |
| inner_shoulder_diameter_2 | Double() | The small shoulder diameter of the inner ring. The default value is calculated internally as a function of the pitch and roller diameters. | d2 |
| outer_diameter | Double(required=True) | The outer diameter of the bearing. | D |
| outer_shoulder_diameter_1 | Double() | The small shoulder diameter of the outer ring. The default value is calculated internally as a function of the pitch and roller diameters. | D1 |
| roller_diameter | Double(required=True) | The rolling element diameter. | dr |
| inner_race_conformity | Double(0.52) | This value expresses the relation of the rolling element diameter to the inner raceway groove radius: (fi: inner race conformity fi = ri/dr, ri: inner raceway radius, 0.51 < fi < 0.54 ). | |
| outer_race_conformity | Double(0.53) | This value expresses the relation of the rolling element diameter to the outer raceway groove radius: (fo: outer race conformity fo = ro/dr, ro: outer raceway radius, 0.51 < fo < 0.54). | |
| young_modulus | Double() | The young modulus of the bearing components. See Comment 2. | |
| poisson_ratio | Double() | The Poisson ratio of the bearing components. See Comment 2. | |
| 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. | |
| 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. | |
| static_load_rating | Double(0.0) | The static load rating of the bearing. It is used in the friction torque calculation. | |
| 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 ring graphics. | |
| nc | Int(6) | Defines the number of nodes in the raceway of ring graphics. | |
| no | Int(2) | Defines the number of nodes in the width of ring graphics. |
Example
b = AngularContactBallBearing(
id=1,
label='bearing',
rm=Marker(part=ground),
number_of_rollers=13,
pitch_diameter=38.5,
width=15.0,
roller_diameter=7.938,
inner_diameter=25.0,
inner_shoulder_diameter_1=36.1,
inner_shoulder_diameter_2=30.8,
outer_diameter=52.0,
outer_shoulder_diameter_1=42.7,
inner_race_conformity=0.52,
outer_race_conformity=0.53,
contact_angle=40 ,
contact_length_a=24,
young_modulus=210000,
poisson_ratio=0.3,
bearing_density= 7.85e-06,
roller_pass_frequency=True,
friction_torque=True,
damping_force=True,
damping_ratio=0.1,
static_load_rating=6.55e3,
lubricant_viscosity=80,
lubrication_method='grease',
inner_connection_part=b_shaft,
outer_connection_part=B_Ground,
)