Increase RPM & Calculate Torque with Gearbox

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Discussion Overview

The discussion revolves around increasing RPM using a gearbox, specifically targeting an increase from 10 RPM to 1500 RPM, and the subsequent calculation of torque. The scope includes theoretical and practical considerations related to gearbox design and application.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that a speed-increasing gearbox would likely require at least three stages to achieve a 150x increase in RPM, noting potential power output requirements and application context.
  • Another participant proposes a single-stage solution involving a large hydraulic pump driving a small hydraulic motor, which could achieve the necessary output ratio.
  • Discussion includes the mention of Föttinger clutches and torque converters, with one participant expressing confusion about how these systems can achieve overdrive characteristics.
  • There is a clarification regarding the nature of the input RPM, with a participant noting that 10 RPM corresponds to a very slow mechanical system, such as a large windmill or water wheel.
  • Concerns are raised about the appropriateness of discussing torque converters in this thread, suggesting that such topics may be better suited for a different category focused on automotive engineering.

Areas of Agreement / Disagreement

Participants express differing views on the number of stages required for the gearbox and the suitability of various mechanical solutions. There is no consensus on the best approach or the specifics of torque converter functionality.

Contextual Notes

Participants acknowledge potential losses in a gearbox system and the importance of application context, but specific assumptions and definitions regarding power and torque calculations remain unresolved.

kotsios7
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Hi guys,
i would like to ask
how do i increase my rpm using a gearbox (2,3,4 stages i don't mind)
Input rpm 10 target output rpm 1500 and after that how can i calculate my torque?
 
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Welcome to the forum.

A speed increasing gearbox will probably need at least 3 stages to give a 150 x increase in RPM.
There will be significant losses. The practical solution will be dependent on how much power output you require.
What is the application? How much torque do you require at 1500 RPM?

Power = torque * RPM

There is possibly a single stage solution. A big shaft hydraulic pump driving a small shaft hydraulic motor where the pump has 150 times the displacement of the motor would achieve the required ratio.
 
Baluncore said:
There is possibly a single stage solution. A big shaft hydraulic pump driving a small shaft hydraulic motor where the pump has 150 times the displacement of the motor would achieve the required ratio.

Föttinger clutch and the Torque converter come to mind. Porsche uses them in their SUV. But,what the OP is talking about is the 5th gear i.e overdrive.
Baluncore:
How the 'Turbine'(the output side) is made to spin faster than the flywheel side(input side) just by pumping-in more oil has always been a mystery(to me). Could you please clear that up? I know the structure and working principle of the hydraulic coupling. But,its overdrive characteristics are always left to merky insider info. People say its the KERS unit that kicks-in as the overdrive but I'm not really sure...
 
kotsios7 is asking about a 10 RPM = 1 rev per 6 seconds. That is a very big windmill or a water wheel.
The 1500 RPM output speed is the same as an electric motor or generator.

I was suggesting positive displacement hydraulic components.

So, I don't think this thread is about a torque converter used in a vehicle.
Questions about torque converters would probably be better under engineering/mechanical/automotive.
http://en.wikipedia.org/wiki/Torque_converter
 

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