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Chat Area => General Car Chat => Topic started by: Webby the Bear on 24 February 2014, 21:47:04

Title: College assignment help needed re transmission torque
Post by: Webby the Bear on 24 February 2014, 21:47:04

Hi guys,

Hopefully this is straight forward:

In the following pic....
(http://i1226.photobucket.com/albums/ee402/webbybear1/gearratios_zpsc4bbcb3e.png) (http://s1226.photobucket.com/user/webbybear1/media/gearratios_zpsc4bbcb3e.png.html)
...we can see that reverse gear has the same everything almost as first gear (which produces the most torque)..... so why is the ratio like -2:1 thus giving the impression the torque is not existant in reverse?

help lol  :-[

Cheers :)

Title: Re: College assignment help needed re transmission torque
Post by: Entwood on 24 February 2014, 21:51:09

At a guess, its because the torque is in the "opposite" direction .. positive torque gives a forwards motion, negative torque gives a rearwards (reverse) motion ??

:)

Title: Re: College assignment help needed re transmission torque
Post by: Marks DTM Calib on 24 February 2014, 21:56:41

Gearbox output torque in reverse is the reverse of the input torque hence it creates a negative torque with respect to the input

Title: Re: College assignment help needed re transmission torque
Post by: Webby the Bear on 24 February 2014, 21:58:17

Fair enough, Nige. I just assumed the torque would be calculated irrespective of direction. :)

Title: Re: College assignment help needed re transmission torque
Post by: Webby the Bear on 24 February 2014, 21:59:13

Quote from: Marks DTM Calib on 24 February 2014, 21:56:41

Gearbox output torque in reverse is the reverse of the input torque hence it creates a negative torque with respect to the input

Thanks Mark. is there then a torque measurement not in comparison of the input shaft? (if that makes sense)