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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=true

ideal=true

ideal=false

same loss data=true

 

ηω, d

ideal=false

ηωI/C = ηω

 

d = d

ideal=false

ηωI/C = ηω

d = 0

ideal=false

same loss data= false

ηP1/SωS/C, ηR/P2ωR/C, d

ideal=false

ηωI/C =  ηP1/SωS/C

 

d = d

ideal=false

ηωR/C =  ηR/P2ωR/C

 

d = 0

   

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

ideal=false

Conditional real output port for power loss

lossPower

 

Parameters

Symbol

Condition

Default

Units

Description

ID

ideal

true

-

Defines whether the component is:

true - ideal or

false - non-ideal

ideal

data source

ideal=false

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

ideal=false

true

-

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

ideal=false

1

Number of planet gear pairs.

A planet pair consists of a set of Planet1 and Planet2 gears

numberofPlanets

ηω

ideal=false

 

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

ideal=false

 

same loss data = true 

 

data source = attachment

- 

 

 

 

 

 

 

 

Defines velocity dependant meshing efficiency

First column is angular velocity (ω)

(See col η below)

data3

ideal=false

 

same loss data = true 

 

data source = file 

- 

fileName3

col η

ideal=false

 

same loss data = true 

 

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

ideal=false

 

same loss data = false 

 

data source = GUI

  0,1,1 

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)

Five options are available:

• 

1 by 1 array: entered value is taken as the constant efficiency for forward and backward cases

η1(ωR/C ) = η2ωR/C = η

• 

1 by 2 array: first entered value is taken as the constant efficiency for forward case and the second for backward cases

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 )

• 

n by 3 array:

Second column is forward efficiency

η1 (ωR/C )

Third column is backward efficiency

η2 (ωR/C )

meshinglossTable1

ideal=false

 

same loss data = false 

 

data source = attachment

 

 

 

- 

 

 

 

 

Defines the velocity dependent meshing efficiency

First column is angular velocity (ωR/C )

(See col ηR/P2 below)

 

 

 

data1

ideal=false

 

same loss data = false 

 

data source = file

 

 

 

-

 

 

fileName1

col ηR/P2

ideal=false

 

same loss data = false 

 

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 (η1=η2 = η) 

• 

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)

columns1

ηP1/SωS/C

ideal=false

 

same loss data = false 

 

data source = GUI

  0,1,1 

rads,, 

Defines Planet1/Sun velocity dependant meshing efficiency as a function of ωS/C .

The columns are:

[ωS/C     (η1(ωS/C )     η2(ωS/C )]

First column is angular velocity of the sun gear w.r.t. carrier (ωS/C)

Five options are available:

• 

1 by 1 array: entered value is taken as the constant efficiency for forward and backward cases

η1(ωS/C ) = η2ωS/C = η

• 

1 by 2 array: first entered value is taken as the constant efficiency for forward case and the second for backward cases

η1(ωS/C ) = η1 , η2(ωS/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 (ωS/C ) = η1 (ωS/C ) = η2 (ωS/C )

• 

n by 3 array:

Second column is forward efficiency

η1 (ωS/C )

Third column is backward efficiency

η2 (ωS/C )

meshinglossTable2

ideal=false

 

same loss data = false 

 

data source = attachment

 

 

 

 

 

- 

 

 

 

 

 

Defines the velocity dependent meshing efficiency

First column is angular velocity (ωS/C )

(See col ηP/S below)

 

 

 

 

 

data2

ideal=false

 

same loss data = false 

 

data source = file

 

 

 

 

-

 

 

fileName2

col ηP1/S

ideal=false

 

same loss data = false 

 

data source = attachment or file

  2,3

-

Defines the corresponding data columns used for forward (η1) and backward (η2) efficiency

Two options are available:

• 

1 by 1 array:

Data column corresponding to the column number is used for both forward and backward efficiency (η1=η2 = η) 

• 

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)

columns2

d

loss  = bearing or bearing and meshing 

0

N · mrads

Linear damping in planets/carrier bearings

d

smoothness

ideal=false

Table points are linearly interpolated

-

Defines the smoothness of table interpolation

There are two options:

• 

Table points are linearly interpolated

• 

Table points are interpolated such that the first derivative is continuous

smoothness

See Also

MapleSim 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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