AngularContactBallBearing
Specifies an analytical bearing that overtakes the radial and axial loads in one direction.
Class Name
AngularContactBallBearing
Description
The bearing is defined by the following dimensions:
Figure 1.
Attribute Summary
The table below summarizes the attributes of the AngularContactBallBearing 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 the 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 inner ring. . The default value is calculated internally as a function of the pitch and roller diameters. | d2 |
| 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_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 |
| 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 diameter. | dr |
| 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. | |
| inner_race_conformity | Double(0.52) | These values express the relation of the rolling element
diameter with the inner raceway groove radius: fi: inner race
conformity
ri: inner raceway radius
|
|
| outer_race_conformity | Double(0.53) | These values express the relation of the rolling element
diameter with the outer raceway groove radius: fo: outer race
conformity
ro: outer raceway radius
|
|
| young_modulus | Double() | The young modulus of bearing components. Default value is calculated internally with respect to the units of the system. AISI 52100 steel has been chosen as the default material. | |
| poisson_ratio | Double() | The Poisson ratio of bearing components. Default value is calculated internally with respect to the units of the system. AISI 52100 steel has been chosen as the default material. | |
| rotating_bearings | 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 in 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 the calculation reference marker. The default value is the defined bearing reference marker (rm). |
|
| damping_factor | Double(0.1) | The damping factor of the bearings. This value must be on the
range:
|
|
| static_load_rating | Double(0.0) | The static load rating of the bearing. 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). | |
| lubrication_method | Enum("grease oil_mist oil_bath oil_jet", default="grease") |
The lubrication method of the bearing (used for the friction torque calculation). | |
| translation_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 = AngularContactBallBearing(
id=1,
label='bearing',
rm=Marker(part=ground),
number_of_rollers=13,
pitch_diameter=38.5,
width=15.0,
roller_diameter=7.938,
roller_density=7.85e-06,
inner_diameter=25.0,
inner_shoulder_diameter_1=36.1,
inner_shoulder_diameter_2=30.8,
inner_density=7.85e-06,
outer_diameter=52.0,
outer_shoulder_diameter_1=42.7,
outer_density=7.85e-06,
inner_race_conformity=0.52,
outer_race_conformity=0.53,
contact_angle=40,
contact_length_a=24,
young_modulus=210000,
poisson_ratio=0.3,
rotating_bearing=True,
friction_torque=True,
damping_force=True,
damping_factor=0.1,
static_load_rating=6.55e3,
lubricant_viscosity=80,
lubrication_method='grease',
inner_connection_part=b_shaft,
outer_connection_part=B_Ground,
)