TaperedRollerBearing

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

Class Name

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,
 
)