TaperedRollerBearing

Model ElementSpecifies an analytical bearing that overtakes the radial and axial loads in one direction.

Class Name

TaperedRollerBearing

Description

The bearing is defined by the following dimensions:

Attributes

The table below summarizes the attributes of the TaperedRollerBearing 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 the 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
contact_angle Double(required=True) The contact angle of the bearing.

Defined in degrees [deg].

a0
width_a Double() The pressure point distance. The default value is calculated internally as a function of pitch diameter, width_t, and contact angle a
width_b Double() The inner ring width. The default value is calculated internally as a function of width_t. b
width_c Double() The outer ring width. The default value is calculated internally as a function of width_b. c
width_t Double(required=True) Total bearing width. t
inner_shoulder_diameter Double() Bearing inner shoulder diameter, as shown on the figure above. The default value is calculated internally as a function of the pitch diameter. d1
inner_diameter Double(required=True) The inner diameter of the bearing. d
outer_diameter Double(required=True) The outer diameter of the bearing. D
roller_diameter Double(required=True) The rolling element diameter. dr
roller_length Double(required=True) The rolling element length. L
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 of 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 in which the output results are written.

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

damping_ratio Double(0.1) The damping ratio of bearing. This value must be between 0.0-1.0.
bearing_k_factor Double(0.0) Expresses the ratio of the basic dynamic thrust load rating and basic dynamic radial load rating (Y/X)

where: P = X · Fr + Y · Fa is the basic dynamic equivalent radial load (example value X = 0.4, Y = 1.53, K = 3.825).

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.
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 outer 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 = TaperedRollerBearing(
id=1,
label='bearing',
rm=Marker(part=ground),

number_of_rollers=19,
pitch_diameter=36.0,
contact_angle=16,

width_a=11.433,
width_b=15,
width_c=11.5,
width_t=15,

inner_shoulder_diameter=37.5,

inner_diameter=25.0,
outer_diameter=47.0,

roller_diameter=5.3,
roller_length=10.7,
effective_roller_length=9.93,
bearing_density= 7.85e-06,

roller_pass_frequency=True,
friction_torque=True,
damping_force=True,

damping_ratio=0.1,
bearing_k_factor=3.5,
lubricant_viscosity=80,

inner_connection_part=b_shaft,
outer_connection_part=B_Ground,

)