STRUCTURE FOR SPRING BRAKE CHAMBER

Disclosed is a art for a highly durable push rod member in which the number of components is reduced as well as the base plate and axle being integrally molded using an aluminum (Al) material, in which the length of the tip of the push rod member which is attached to the axle is adjusted and set, and which reduces the production effort to a large extent and results in little deterioration. Specifically, disclosed is a structure for a spring brake chamber wherein a chamber case (13) on one side and a return spring housing case (14) on the opposite side are connected by a connecting case (15). A release bolt (16) is disposed in the axial section of the chamber case (13) in the longitudinal direction thereof. A push rod member (26) is disposed in the return spring housing case (14), specifically, in a third pressure medium chamber (14A), and is configured from a substantially disk-shaped push plate (26A) which is formed from an aluminum material, a axle body (26B) which is integrally formed protruding from the center of the push plate (26A) which is inserted and fixed in a central hole in the axle body (26B).