Dépannage Eaton engrenages de transmission & Shafts

Clashing Gears

Snubbing and clashing gears while shifting are frequent abuses to which unsynchronized transmissions are subjected. Light snubbing will do little damage. The real damage is done by the hard clash shift caused by engaging gears which are far out of synchronization. This can break pieces of metal from the ends of the clutching teeth. Clashing gears can be traced to one of three causes:

snubbed clutching gear teeth

Dents rabroué Clutching engrenages

1. Une mauvaise Shifting

This applies to drivers who are not familiar with the shift pattern or have not learned the RPM spread between shifts.

2. Embrayage

Clashing when starting up in first or reverse gear can be caused by insufficient clutch clearance or a dragging clutch not releasing properly. This makes the transmission countershafts and mainshaft gears continue rotating while the clutch pedal is depressed. Clashing results when the nonrotating sliding clutch is forced to mesh with a rotating mainshaft gear. Double clutching during lever shifts will also reduce snubbing and clashing.

3. force inertielle

Et arbres intermédiaires pignons d'arbre principal prennent habituellement de 3 à 5 secondes pour arrêter la rotation après l'embrayage a été débrayé. Tentative de maille d'un pignon d'embrayage avec un pignon d'arbre principal avant l'arrêt du pignon d'arbre principal entraîne heurter. Si la transmission est pas équipé d'un frein d'embrayage ou de frein de l'arbre intermédiaire, il est nécessaire de faire une pause de quelques secondes après avoir appuyé sur la pédale d'embrayage avant de tenter l'engagement initial de la transmission.

Les marques de fabrication

Sometimes gears are replaced or thought to be defective because of marks left on the gear by manufacturing processes. ces imperfections, toutefois, do not contribute to gear failure and the gear should not be replaced because of these marks.

Marks plaques

hob marks

These are cutting marks or lines formed during the initial cutting of the gear teeth. Hob marks on the tooth face will be removed by the shaving process, but hob marks in the root of the tooth will most likely remain, and may be found even on gears with much wear on them.

Marques de rasage

shaving marks on gear

The shaving operation leaves distinct diagonal marks on the face of the gear tooth. These marks can be distinguished from scoring marks by the fact they are diagonal, while scoring marks are more nearly vertical. Most shaving marks are removed during normal gear operation.

vitesse Chants

vitesse Chants

ébarbures ou de rasage de araser, is the formation of “lips” at the tip of the gear teeth machining. Ces « lèvres » feront pas de mal à l'engrenage.

Vitesse Rattle au ralenti

Mainshaft gears are designed to have a specified amount of axial clearance which allows them to rotate freely on the mainshaft. The amount of clearance is governed by the use of washers. Un moteur au ralenti rugueux peut créer des vibrations, causing the mainshaft gears to rattle as they strike mating gears. This condition can usually be cured by improving the idling characteristics of the engine. Tolerance washers may have to be changed to bring the axial gear clearance to within tolerance on high mileage units. See the service manual for procedure and specifications.

Arbre Twist et Fracture

Failure of transmission shafts through fracturing or twisting is caused when stresses are imposed on them which are greater than they were designed to withstand. The main causes for these failures are:

  1. De mauvaises techniques d'embrayage.
  2. A partir trop élevé d'engins.
  3. trimballer.
  4. Tentative de démarrage avec freins bloqués.
  5. Transmission used for application it was not designed to withstand.
  6. Cognant quai lors de la sauvegarde.
  7. Un montage incorrect de la roue 5 réglable.
fractured mainshaft

Fractured arbre principal
Comme avec les dents d'engrenage, shafts may fracture as a result of fatigue or impact.

twisted mainshaft

Twisted arbre principal
Loads not severe enough to cause shaft fractures may cause the shaft to twist.

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