Ravigneaux Gear
Ravigneaux Gear component
The Ravigneaux Gear component is a double planetary gear set with two sun gears (a small sun and a large sun), a carrier and a ring gear. The carrier carries two sets of independent planets; outer planets and inner planets which mesh with the large sun and the small sun, respectively. Each inner planet gear meshes with a corresponding outer planet gear. The gear ratios are uniquely defined by specifying the rear and front planetary gears Ring to Sun ratios.
This compound planetary gear set is constructed from four gear pairs; one Planet Ring gear, and three Planet Planet gears as shown in the diagram below.
Internal Structure
Internal Settings
Component
PPG1
PGG2
PGG3
PRG1
rR/sS , rR/lS
rO/I = rR/sS − rR/lS2 rR/lS
rO/I = rR/lS − 1rR/sS − rR/lS
rO/I = rR/lS − 12
rR/P = 2rR/lSrR/lS − 1
ideal=true
ideal=false
same loss data=true
ηω, d
ηωI/C = ηω
d = d
d = 0
ηωR/C = ηω
same loss data= false
ηiP/sSωsS/C, ηoP/iPωiP/C
ηR/oPωR/C, ηoP/lSωil/C
diP/C ,doP/C
ηωI/C = ηiP/sSωsS/C
d = diP/C
ηωI/C = ηoP/iPωiP/C
d = doP/C
ηωI/C = ηoP/lSωlS/C
ηωR/C = ηR/oPωR/C
Connections
Name
Condition
Description
ID
Carrier C
−
Carrier flange
carrier
Ring (R)
Ring flange
ring
Small Sun sS
Sun flange
small_sun
Large Sun lS
Large flange
large_sun
Inner PlanetiP
planet port=true
Inner Planet flange
inner_planet
Outer PlanetoP
Outer Planet flange
outer_planet
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
rR/sS
4
Ring/Small Sun Gear ratio
ratio1
rR/lS
2
Ring/Large Sun Gear ratio
ratio2
npl
1
Number of planet gear pairs
A planet pair consists of a set of inner planet and outer planet 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:
Second column is forward and backward efficiency
η (ω) = η1 (ω ) = η2(ω )
n by 3 array:
Second column is forward efficiency
η1 (ω)
Third column is backward efficiency
η2 (ω )
meshinglossTable5
data source = attachment
Defines velocity dependant meshing efficiency table
First column is angular velocity (ω)
(See col η below)
data5
data source = file
fileName5
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:
Data column corresponding to the column number is used for both forward and backward efficiency η=η1 = η2
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)
columns5
ηiP/sSωsS/C
same loss data = false
rads,−, −
Defines inner Planet/small Sun velocity dependant meshing efficiency as a function of ωsS/C .
The columns are:
[ωsS/C η1ωsS/C η2(ωsS/C )]
First column is angular velocity of the small sun gear w.r.t. the carrier (ωsS/C)
η1(ωsS/C ) = η2ωsS/C = η
η1(ωsS/C ) = η1 , η2(ωsS/C ) = η2
Second column is forward and backward efficiencies.
η (ωsS/C ) = η1 (ωsS/C ) = η2 (ωsS/C )
η1 (ωsS/C )
η2 (ωsS/C )
meshinglossTable1
Defines the velocity dependent meshing efficiency
First column is angular velocity (ωsS/C )
(See col ηiP/sS below)
data1
fileName1
col ηiP/sS
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
ηoP/iPωiP/C
Defines outer Planet/inner Planet velocity dependant meshing efficiency as a function of ωiP/C .
[ωiP/C (η1(ωiP/C ) η2(ωiP/C )]
First column is angular velocity of the inner planet gear w.r.t. the carrier (ωiP/C)
η1(ωiP/C ) = η2ωiP/C = η
η1(ωiP/C ) = η1 , η2(ωiP/C ) = η2
η (ωiP/C ) = η1 (ωiP/C ) = η2 (ωiP/C )
η1 (ωiP/C )
η2 (ωiP/C )
meshinglossTable2
First column is angular velocity (ωiP/C )
(See col ηP1/S below)
data2
fileName2
col ηoP/iP
Defines the corresponding data columns used for forward (η1) and backward (η2) efficiency
columns2
ηR/oPωR/C
Defines Ring/outer Planet velocity dependant meshing efficiency as a function of ωR/C .
[ωR/C (η1(ωR/C ) η2(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
η (ωR/C ) = η1 (ωR/C ) = η2 (ωR/C )
η1 (ωR/C )
Third column is forward efficiency
η2 (ωR/C )
meshinglossTable3
First column is angular velocity (ωR/C )
(See col ηR/oP below)
data3
fileName3
col ηR/oP
columns3
ηoP/lSωlS/C
[rads, −, −
Defines outer Planet/large Sun velocity dependant meshing efficiency as a function of ωlS/C .
[ωlS/C η1(ωlS/C ) η2(ωlS/C )]
First column is the angular velocity of the large sun gear w.r.t. the carrier (ωlS/C)
η1(ωlS/C ) = η2ωlS/C = η
η1(ωlS/C ) = η1 , η2(ωlS/C) = η2
First column is ignored and the second and third values are taken as constant efficiency for forward and backward cases, respectively
η(ωlS/C ) = η1 (ωlS/C ) = η2 (ωlS/C )
η1 (ωlS/C )
η2 (ωlS/C )
meshinglossTable4
First column is angular velocity (ωlS/C )
(See col ηoP/lS below)
data4
fileName4
col ηoP/lS
Defines the corresponding data columns used for forward (η1) and backward (η2) efficiency
Data column corresponding to the column number is used for both forward and backward efficiency η=η1 = η2
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)
columns4
diP/C
lideal=false
0
N⋅mrads
Linear damping in planet1/carrier bearings
d1
doP/C
Linear damping in planet2/carrier bearings
d2
d
Linear damping in planet/carrier bearing
d3
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
Gear Sets
Planetary Gear
Planet Planet Gear
Planet Ring Gear
Download Help Document