Dual-Ratio Planetary Gear
Dual-Ratio Planetary Gear component
The Dual-Ratio Planetary Gear is based on the Planetary Gear component. It has a set of two co-rotating planet gears with different radii where the first planet meshes with the sun gear and the second planet meshes with the ring gear. Both Ring/Planet(1) and Planet(2)/Sun ratios must be provided. For planets/carrier bearing damping calculations, a set of Planet(1) and Planet(2) gears is considered is one body.
Internal Structure
Internal Settings
Component
PPG1
PRG1
rP1/S , rR/P2
rO/I = rP1/S
rR/P = rR/P2
ideal=true
ideal=false
same loss data=true
ηω, d
ηωI/C = ηω
d = d
d = 0
same loss data= false
ηP1/SωS/C, ηR/P2ωR/C, d
ηωI/C = ηP1/SωS/C
ηωR/C = ηR/P2ωR/C
Connections
Name
Condition
Description
ID
Carrier
−
Carrier flange
carrier
Planet
planet port=true
Planet flange
planet
Ring
Ring flange
ring
Sun
Sun flange
sun
Loss Power
Conditional real output port for power loss
lossPower
Parameters
Symbol
Default
Units
ideal
true
-
Defines whether the component is:
true - ideal or
false - non-ideal
data source
GUI
Defines the source for the loss data:
entered via GUI [GUI]
by an attachment [attachment]
by an external file [file]
datasourcemode
same loss data
Defines whether one efficiency data table is used for all meshing loss calculations [same loss data=true] or the efficiency of each meshing gear pair is given by a separate data table [same loss data=false].
SameMeshingEfficiency
rP1/S
1
Planet1/Sun Gear ratio
ratio1
rR/P2
4
Ring/Planet2 Gear ratio
ratio2
npl
Number of planet gear pairs.
A planet pair consists of a set of Planet1 and Planet2 gears
numberofPlanets
ηω
same loss data = true
data source = GUI
0,1,1
rads,−,−
Defines all velocity dependant meshing efficiencies.
The columns:
[ω (η1 (ω ) η2 (ω )]
Five options are available:
1 by 1 array: entered value is taken as the constant efficiency for forward and backward cases
η1 (ω ) = η2 (ω ) = η
1 by 2 array: first entered value is taken as the constant efficiency for forward case and the second for backward cases
η1 (ω )= η1 , η2 (ω ) = η2
1 by 3 array: first column is ignored and the second and third values are taken as constant efficiencies for forward and backward cases, respectively
n by 2 array: 2nd column is forward and backward efficiency
η (ω) = η1 (ω ) = η2(ω )
n by 3 array:
2nd column is forward efficiency
η1 (ω)
3rd column is backward efficiency
η2 (ω )
meshinglossTable3
data source = attachment
Defines velocity dependant meshing efficiency
First column is angular velocity (ω)
(See col η below)
data3
data source = file
fileName3
col η
data source = attachment or file
2,3
Defines the corresponding data columns used for forward efficiency (η1) and backward efficiency (η2 )
Two options are available:
1 by 1 array:
Data column corresponding to the column number is used for both forward and backward efficiency (η=η1 = η2)
1 by 2 array:
Data column corresponding to the first column number is used for forward efficiency ( η1)
and data column corresponding to the second column number is used for backward efficiency ( η2)
columns3
ηR/P2ωR/C
same loss data = false
rads,−, −
Defines Ring/Planet2 velocity dependant meshing efficiency as a function of ωR/C .
The columns are:
[ωR/C τ1(ωR/C ) τ2(ωR/C )]
First column is angular velocity of the ring gear w.r.t. the carrier (ωR/C)
η1(ωR/C ) = η2ωR/C = η
η1(ωR/C ) = η1 , η2(ωR/C ) = η2
1 by 3 array: first column is ignored and the second and third values are taken as constant efficiencies for forward and backward cases, respectively.
n by 2 array: Second column is forward and backward efficiency
η (ωR/C ) = η1 (ωR/C ) = η2 (ωR/C )
Second column is forward efficiency
η1 (ωR/C )
Third column is backward efficiency
η2 (ωR/C )
meshinglossTable1
Defines the velocity dependent meshing efficiency
First column is angular velocity (ωR/C )
(See col ηR/P2 below)
data1
fileName1
col ηR/P2
Defines the corresponding data columns used for forward efficiency (η1) and backward efficiency (η2)
Data column corresponding to the column number is used for both forward and backward efficiency (η1=η2 = η)
Data column corresponding to the first column number is used for forward efficiency (η1) and Data column corresponding to the second column number is used for backward efficiency (η2)
columns1
ηP1/SωS/C
Defines Planet1/Sun velocity dependant meshing efficiency as a function of ωS/C .
[ωS/C (η1(ωS/C ) η2(ωS/C )]
First column is angular velocity of the sun gear w.r.t. carrier (ωS/C)
η1(ωS/C ) = η2ωS/C = η
η1(ωS/C ) = η1 , η2(ωS/C ) = η2
η (ωS/C ) = η1 (ωS/C ) = η2 (ωS/C )
η1 (ωS/C )
η2 (ωS/C )
meshinglossTable2
First column is angular velocity (ωS/C )
(See col ηP/S below)
data2
fileName2
col ηP1/S
Defines the corresponding data columns used for forward (η1) and backward (η2) efficiency
Data column corresponding to the first column number is used for forward efficiency (η1) and
Data column corresponding to the second column number is used for backward efficiency (η2)
columns2
d
loss = bearing or bearing and meshing
0
N · mrads
Linear damping in planets/carrier bearings
smoothness
Table points are linearly interpolated
Defines the smoothness of table interpolation
There are two options:
Table points are interpolated such that the first derivative is continuous
See Also
Driveline Library Overview
MapleSim Library Overview
1-D Mechanical Overview
Planetary Gear Sets
Counter Rotating Planetary Gear
Planet Planet Gear
Planet Ring Gear
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