Diaphragm retainer for spring brake actuator

Details Diaphragm retainer for spring brake actuator Diaphragm retainer for spring brake actuator

1998-06-26

2000-12-26

Lopez, F. Daniel

Expansible chamber devices

Relatively movable working members

First working member moves second coaxial working member...

92 99, F01B 700

Patent

active

061641871

ABSTRACT:
A spring brake actuator (10), with a first spring brake chamber (76) filled with compressed air and a second spring brake chamber (78) housing a large-force compression spring (82), includes an elastomeric diaphragm (74) having a centrally-disposed aperture (90) separating the first and second spring brake chambers (76 and 78). The elastomeric diaphragm (74) is compressed at a peripheral edge (138) between housing sections (66, 68) and at a collar (140), which is adjacent the centrally-disposed aperture (90), between a ring-shaped retainer (142) and at least one of an actuator rod, a pressure plate (92), and an annular recess (144) in a pressure plate (92). In one embodiment, the retainer (142) includes an annular channel (154) having an inner rim (150), an outer rim (152), and a base (156). Evenly-spaced flanges (146) radiate axially from, and are separated by slots (148) on, the inner rim (150). The groove (144) is adapted to receive the base (156) of the channel (154), with the collar (140) of the elastomeric diaphragm (74) secured therebetween, and the flanges (146) secure the retainer (142) therein. In a further embodiment, the retainer (242) includes an inner rim (150) having a flange (256), a ramped outer rim (252), and a base (290). The annular recess (244) is adapted to receive the base (156) of the channel (154) and the flange (256), with the collar (240) of the elastomeric diaphragm (274) secured therebetween, whereby the friction fit aided by the ramped outer rim (252) and the flange (256) secures the retainer (242) therein.

REFERENCES:
patent: 5105727 (1992-04-01), Bowyer
patent: 5226291 (1993-07-01), Osterday et al.
patent: 5377579 (1995-01-01), Pierce

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