Snubber for excavator bucket door

E - Fixed Constructions – 02 – F

Patent

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Details

E02F 3/40 (2006.01) E02F 3/407 (2006.01) E02F 9/22 (2006.01)

Patent

CA 2253258

A snubber (60) is used to damp the swing of the door (36) on an excavator bucket (30) to prevent the door (36) from being damaged by repeatedly slamming shut. The snubber (60) has a housing (61) which mounts to an excavator bucket and a shaft (70) pivotally mounted in the housing and connected to an excavator door (36). The shaft (70) turns when the excavator door (36) opens. The housing (61) has a cylindrical cavity (72) around the shaft. The cavity (72) is divided into two volumes (72B, 72A) by a dam (82) and a wiper arm (80) on the shaft (70). The wiper arm (80) forces hydraulic fluid (94) to flow through an orifice (101) between the volumes (72B, 72A) as the shaft (70) turns. The wiper arm (80) has end seals (90) which seal against end walls (68, 66) of the cavity (72). The end seals (90) are forced outwardly by hydraulic pressure when the door (36) is closing. A one-way valve (102) allows hydraulic fluid (94) to bypass the orifice (101) while the door (36) is opening. The snubber (60) requires less maintenance than previous friction-type snubbers.

On utilise un limiteur de débattement pour atténuer le balancement du volet (36) d'un godet (30) d'excavatrice et ce, afin d'éviter que ce volet (36) ne soit endommagé par de fréquentes fermetures brutales. Le limiteur (60) comporte un boîtier (61) monté sur le godet et un arbre (70) pourvu d'un montage à pivot dans le boîtier et relié à un volet (36). L'arbre (70) tourne lorsque ce volet (36) s'ouvre. Dans le boîtier (61) est ménagée une cavité cylindrique (72) entourant l'arbre. Cette cavité (72) est subdivisée en deux volumes (72B, 72A) par une barrière (82) et un bras de balayage (80) sur l'arbre (70). Ce bras de balayage (80) force le passage d'un fluide hydraulique (94) à travers un orifice (101) situé entre les volumes (72B, 72A) lorsque l'arbre (70) est en rotation. Il possède également des fermetures d'extrémité (90) obturant les parois d'extrémités (68, 66) de la cavité (72). Ces fermetures d'extrémités (90) sont poussées vers l'extérieur par la pression hydraulique lorsque le volet (36) se ferme. Un clapet anti-retour (102) permet au fluide hydraulique (94) de contourner l'orifice (101) lorsque le volet (36) s'ouvre. Ce limiteur (60) nécessite moins d'entretien que ses prédécesseurs du type à friction.

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