Detecting Dynamic Torque Across a Geared System

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Discussion Overview

The discussion centers on the detection of dynamic torque across a geared system, particularly in applications such as transmissions. Participants explore the feasibility of sensing torque direction (positive, negative, or zero) in a running system, with a focus on the types of sensors available and their operational characteristics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • KM inquires about sensors capable of dynamically sensing torque in a geared system, emphasizing the need for direction detection rather than magnitude.
  • One participant suggests using torque sensors, specifically mentioning Honeywell gauges that utilize strain gauges adapted for rotary applications.
  • Another participant recommends checking with Lebow, indicating their expertise in torque sensing technology.
  • A participant notes that if there is gearing other than 1:1 between input and output shafts, it is possible to sense both the direction and magnitude of transmitted torque using gauges on non-rotating elements.
  • KM reflects on the concept of sensing torque through the gearshift lever in a manual transmission, questioning why a direct 1:1 case would limit torque detection.
  • KM also considers the optimal mounting for a strain gauge to indicate in-line torsion between two housings.

Areas of Agreement / Disagreement

Participants express various viewpoints on the capabilities of different torque sensing technologies and their applicability in specific scenarios. There is no consensus on the limitations of 1:1 gearing or the best mounting practices for strain gauges.

Contextual Notes

Participants express uncertainty regarding the operational characteristics of torque sensors in specific configurations, particularly in relation to 1:1 gearing and the effectiveness of different mounting strategies.

Who May Find This Useful

Individuals interested in torque sensing technologies, particularly in mechanical engineering, automotive applications, and sensor technology development.

Kenneth Mann
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I'd like to know if anyone here knows of anything that can sense the torque dynamically across a geared system (such as a transmission); basically, whether it is in a "positive" direction, a "negative" direction or zero. (The magnitude is not important, though it would be useful to know when it is approaching zero.) Most torque gauges and meters are static devices, but I'd like to know of one that works in a situation where the system is running.

KM
 
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A torque sensor then?

2 seconds of google gives some Honeywell gauges at:
http://www.sensotec.com/torque.asp

They're just normal strain gauges but adapted for rotary use.

Any help?
 
In a word, yes! Thanks

KM
 
If there is any gearing (other than 1:1) between the input and output shafts, or if the input and output shafts are not on the same axis, then you will also be able to sense the direction (and magnitude) of the transmitted torque by means of gauges on the non rotating elements (typically the gearbox mountings).
 
FredGarvin said:
Check also with Lebow. It's their specialty. I have used them many times.

Again, thanks!


ceptimus said:
If there is any gearing (other than 1:1) between the input and output shafts, or if the input and output shafts are not on the same axis, then you will also be able to sense the direction (and magnitude) of the transmitted torque by means of gauges on the non rotating elements (typically the gearbox mountings).

Very interesting! I guess, in a way, that should have been somewhat apparent. After all, we can feel the the zeroing out of the torque across an automobile (manual) transmission through the gearshift lever (It becomes loose and movable). I assume therefore, that simply by adapting a strain gauge platform to go, for example. between a transmission and whatever follows, I'd get an indication of the magnitude and direction of the torque?

I'm not sure though - - Why would a direct through, 1:1 case be a limiting condition? As I recall, the zeroing of the torque can also be detected in "top" gear, which is direct and 1:1. (I haven't actually driven a manual for quite a while.)

Also, can I assume that the best mounting would be that which would best indicate an in-line torsion between the two housings?

And again, thanks!

KM
 

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