Oil pump and automatic transmission including the same

Details Oil pump and automatic transmission including the same Oil pump and automatic transmission including the same

F - Mech Eng,Light,Heat,Weapons

04

C

F04C 15/00 (2006.01) F04C 2/10 (2006.01)

Patent

CA 2550313

An oil pump where, even if a pump cover is formed of a light alloy without changing the material, occurrence of cavitation erosion is appropriately suppressed in high-speed rotation of a drive gear. Either a pump body (10) or a pump cover (15) is formed of cast iron and the other, of a light alloy, and the length of either a notch (26a) or a notch (26b) formed in the pump body (10) or pump cover (15) that is formed of the light alloy is set greater than the length of the notch formed in the pump body (10) or pump cover (15) that is formed of the cast iron. This enables bubbles produced in hydraulic oil in an operation chamber (R) in high-speed rotation of a drive gear (30) to be crushed by high-pressure hydraulic oil flowing back toward the operation chamber (R) through the longer notch, the crush occurring on the inner surface side, facing the operation chamber (R), of the pump body (10) or pump cover (15) that is formed of the cast iron.

L'invention concerne une pompe à huile dans laquelle, même si un élément couvrant est formé dans un alliage léger sans changement de matériau, l'érosion par cavitation est supprimée de manière appropriée pendant la rotation à vitesse élevée d'un engrenage d'entraînement. Un élément parmi un corps (10) de pompe et un élément couvrant (15) de pompe est formé en fonte et l'autre dans un alliage léger et la longueur d'un bouton (26a ou 26b) formé dans ledit corps (10) ou dans ledit élément couvrant (15) formé dans l'alliage léger est supérieure à celle du bouton formé dans le corps (10) ou l'élément couvrant (15) formé en fonte, permettant ainsi de produire des bulles dans une huile hydraulique dans une chambre fonctionnelle (R) pendant la rotation à vitesse élevée de l'engrenage d'entraînement (30) à broyer au moyen de l'huile hydraulique haute pression s'écoulant en direction de la chambre fonctionnelle (R), par le biais du bouton le plus long, le broyage ayant lieu sur le côté de la surface interne, en face de la chambre fonctionnelle (R), du corps (10) ou de l'élément couvrant (15) de la pompe formé en fonte.

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