Vehicle & Technical > Discovery

Whining from somewhere

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feenix:

--- Quote from: "sptb" ---Have you checked the passenger seat? Over the years I've found more whinning comes from there than any other part of the car.
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lmfao

Mudlark:

--- Quote from: "cardiff_gareth" ---

What is backlash then and how's it fixed :?:
--- End quote ---


Gear Backlash



Properly functioning mechanical systems need to have a certain “clearance”
(“gap”, “play”) between the components transmitting motion under load.
Clearance is necessary to avoid interference, wear, and excessive heat
generation, ensure proper lubrication, compensate for manufacturing tolerances
etc. Clearance in the gear mesh means that the gap between the teeth of one
gear is by a small amount larger than the tooth width of the mating gear.
We also find a certain clearance in the rolling bearings, namely a small clearance
between the inner race, rolling body (ball, roller) and outer race of the bearing.
The key and keyway of a shaft or hub usually have also clearance.



Wearing of the gears will increase backlash, the backlash can be reduce by moving the meshing gears closer together, however this is only possible if each gear is on a separate shaft due to different wear on different gears.

In a vehicle gearbox the drive gears all share the same shaft and the driven gears all share another shaft constantly meshing therfore is is not possible to reduse backlash within a gearbox.

Even if it were possible to reduce backlash it can not be eliminated completely as the backlash is necessary to prevent seizure of the gears.

cardiff_gareth:

--- Quote from: "Range Rover Blues" ---Without going into lots of detail, backlash is something you adjust during the build-up.  Do you have a fair amount of slack in the transmission when you go from drive to overun?
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Nope :!:
Selector plate in top of gearbox has gone and needs to be replaced at somepoint but apart from that gears are good when going through them.

What do you mean drive to overun :?:

Range Rover Blues:
You'll notice it a lot more in low box when you are out laning, but when you go from having the power on to taking your foot way off the pedal, does the transmission sort of shuffle (that's a real technical term BTW) or make any banging noises?  my diffs are way too loose and laning can be horrible sometimes so I've taken to left foot braking.

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