Can Brakes on the Drive Shaft Improve Vehicle Performance?

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Discussion Overview

The discussion centers around the feasibility and implications of installing brakes on a vehicle's drive shaft or at the flywheel, exploring both theoretical and practical aspects of such a braking system. Participants consider the potential benefits and limitations of this approach in various vehicle configurations, including two-wheel and four-wheel drive systems.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants question why brakes cannot be placed on the drive shaft or flywheel, suggesting it could simplify the braking system by eliminating wheel hub brakes.
  • Others argue that placing brakes on the drive shaft could lead to issues with traction, as one wheel may have traction while the other does not, complicating the vehicle's ability to slow down effectively.
  • Concerns are raised about the potential for increased stress and wear on the drive shaft and transmission components if brakes are applied at the drive shaft, particularly in two-wheel drive vehicles.
  • One participant notes that while some vehicles have utilized drive shaft brakes, such as early F-1 racers, these systems faced challenges, particularly with heat management.
  • Another participant mentions that while drive shaft brakes are used in heavy machinery to hold stationary positions, they may not be suitable for stopping a fast-moving vehicle due to the stresses involved.
  • There is a suggestion that dynamic (regenerative) braking could be integrated with a drive shaft braking system, provided there is adequate heat dissipation.

Areas of Agreement / Disagreement

Participants express a range of views, with no consensus reached on the practicality or effectiveness of implementing brakes on the drive shaft. Multiple competing perspectives remain regarding the advantages and disadvantages of such a system.

Contextual Notes

Limitations discussed include the potential for increased stress on drive shaft components, the challenges of heat management in braking systems, and the implications for traction in different wheel configurations.

Who May Find This Useful

This discussion may be of interest to automotive engineers, vehicle design enthusiasts, and individuals exploring innovative braking systems in vehicles.

Chandrakiran
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Brakes on Drive Shaft ??

HI all,

I am new to this forum. I have a doubt on braking system. Any help in this regard is highly appreciated.

Why can not we have brake on drive shaft or some point at flywheel ??

Any discussion in this regard is appreciated. I am hoping to find a solution here.

Thanks!
Shekar
 
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what is the problem with the brakes with wheel hub??
 
HI,

There is no problem with the brakes on hub. But anyway the wheel hub is rotating by a shaft which in turn rotating with a drive shaft. So a simple arrangement to stop or slowingdown the drive shaft, results the same, thus I can eliminate the brakes on wheel. What are the limitations I have to think like this ??

Shekar
 
If you put a brake on a car's drive shaft instead of one on each wheel, then if one wheel was getting traction but the other wasn't getting traction, you'd not be able to slow the car down.
 
Chandrakiran said:
HI all,

I am new to this forum. I have a doubt on braking system. Any help in this regard is highly appreciated.

Why can not we have brake on drive shaft or some point at flywheel ??

Any discussion in this regard is appreciated. I am hoping to find a solution here.

Thanks!
Shekar
There would be the disadvantage of putting high stresses in the drive shaft or transmission to wheels, leading to increased wear or perhaps failure of the drive shaft, gears, joints or connecting rods between transmission and wheels.

On a car with two wheel drive - as opposed to 4-wheel - the braking on the drive shaft would affect only two wheels connected to the transmission, and one would still need additional breaking on the other two wheels.

There is a possibility to use dynamic (regenerative) breaking associated with the drive shaft, either electrically or mechanically.
 
like most other ideas on cars it has been done
early 60's BRM F-1 racers had a brake on the transaxle
problems with heat killed the transaxle brake

a flywheel is not a good place to brake and add heat
remember brakes work by making heat
and the flywheel needs to turn or the motor stops
 
I've only seen one setup where the brake was on the drive shaft, but early Jags and maybe a few other makes had inboard discs that worked on the axle shafts.
The drive shaft one was actually referred to as a differential brake, because it was attached where the drive shaft entered the banjo. It was on 'X-treme 4x4' (Spike channel), on a rock crawler.
 
Most drivehafts are made of thinwall tubing, u-joints are designed to transmit power of acceleration, and stopping a fast moving vehicle will in many cases involve far more stress on these two items, than they will endure.
Many big trucks, and lots of heavy machinery have brakes on drive shafts, but the purpose is only to hold a stationary position.
 
HI all,

Thanks for the time and discussion. I understand now, the limitations to have a brake system on drive shaft.

But added to this, suppose if I am thinking of a 4 wheel drive, with a brake arrangement on front / rear transaxle, with a sufficient method to heat dissipation, I must be able to design a brake system right ?

Can anyone help me in providing some information about Dynamic ( Regernerative) braking system ? Some useful site ??
 

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