Differential with 3 output shafts
Differential with 3 output shafts
(OP)
Is there a design of differential where the input power is distributed to 3 (or more) output shafts?
Thanks.
Thanks.
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Differential with 3 output shafts
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RE: Differential with 3 output shafts
Sam Shen
Clutch and Driveline engineer
Drive for the future
RE: Differential with 3 output shafts
Thanks for the response.
I suspect that adding another differential to one of the original differential output shafts will result in the power being split 50% / 25% / 25%. The objective is to obtain a 33% / 33% / 33% power split.
Dave
RE: Differential with 3 output shafts
Sam Shen
Clutch and Driveline engineer
Drive for the future
RE: Differential with 3 output shafts
Thanks again for the reply.
I looked into the planetary central differential used in 4W drives. They appear to split the power 25% / 25% /25% / 25% and if any two of the outputs were combined the resultant power output would be 25% / 25% / 50%. Brakes or clutches will change the ratios but they will result in friction.
There must be some 'unusual' gearing arraignment that will output the power 33% / 33% / 33%.
Dave
RE: Differential with 3 output shafts
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I'm a little confused, because almost all the central differential in the 4WD system only have 2 way output,which distribute the power to the front axle and rear axle. For a planet gear system, there is three in/out path which usually refer to the sun gear/ring gear/carrer. Maybe this system contain 3 or 4 planet gears, but this doesn't mean that the power is split into 3 path or 4 path. The power distribution is only determined by the gear ratio of the sysytem. The most popular design maybe about 40/60 to meet the weight distribution of the vehicle. In recent years, some high lever cars use electronic magnic torque clutch to achieve more accurate and flexible distribution instand of the tranditional mechnical gear system.
Sam Shen
Clutch and Driveline engineer
Drive for the future
RE: Differential with 3 output shafts
I was not very clear. My belief is that the central differential will split the power 50/50 between it's 2 outputs. These 2 outputs will be the inputs to 2 additional differentials, and these differentials will split the power 50/50 between their outputs. This will result in a total of 4 final outputs, with each delivering 25% of the power.
A planetary gear will act as a differential but the gearing ratio will not change the power split of 50/50.
Clutches and brakes can be used to vary the 50/50 power split, however they will consume power and generate heat if subjected to continual usage.
Thanks again.
Dave
RE: Differential with 3 output shafts
How is it then possible to optionally completely lock the centre differential ? I just cannot see how you could lock something that has other than a 50/50 torque split unlocked.
Even if you did it by having different front and rear diff ratios (really the same thing) you would then be in real trouble if the centre diff was solidly locked.
RE: Differential with 3 output shafts
RE: Differential with 3 output shafts
If interested, a sketch of the 2-way, 3-way, and 4-way is on web page; http://www.unicopter.com/1466.html. An elaboration of the 3-way is on web page; http://www.unicopter.com/1403.html
If anyone should find fault, please advise.
Dave