Small envelope tamper-resistant spring brake actuator

F - Mech Eng,Light,Heat,Weapons – 01 – B

Patent

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Details

F01B 29/00 (2006.01) B60T 17/08 (2006.01)

Patent

CA 2267995

A small envelope is achieved for an inelastically deformed connection between a spring cover (22) and a central housing in a spring brake actuator. The connection is deformed radially inwardly (32) and then extends radially outwardly (31) from the radially inwardly extending portion. This eliminates the radially outwardly extending portion and flanges as are typically utilized in the prior art. Thus, a much smaller enveloppe is provided. In preferred embodiments of this invention, a seal groove (36) is positioned axially adjacent a securement groove in the central housing. A seal (34) is positioned in the seal groove to ensure an air-tight seal. In addition, a unique diaphragm guiding structure (62) is incorporated into one embodiment of this invention.

On utilise une petite enveloppe pour assurer une connexion à déformation non élastique entre le boîtier du ressort (22) et l'espace central d'un cylindre de frein à ressort accumulateur. La connexion se déforme radialement vers l'intérieur (32) puis s'étend radialement vers l'extérieur (31) à partir de la partie s'étendant radialement vers l'intérieur. On peut ainsi supprimer la partie s'étendant radialement vers l'extérieur et les flasques utilisés dans les techniques antérieures et obtenir une enveloppe beaucoup plus petite. Dans la variante préférée de l'invention, une gorge d'étanchéité (36) est placée axialement voisine d'une gorge de sécurité prévue dans le logement central. Un joint (34) placé dans la gorge d'étanchéité assure l'étanchéité à l'air. De plus, une structure (62) unique de guidage de la membrane est incorporée à l'une des variantes de l'invention.

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