Automotive air pressure spring brake chamber having caging bolt assembly

An automotive air pressure spring brake chamber comprising:

• a head housing;
• a bottom housing;
• an adaptor housing between the head housing and the bottom housing;
• a piston between the head housing and the adaptor housing;
• a hollow actuator rod coupled to the piston and disposed through a through-hole of the adaptor housing;
• and
• a caging bolt assembly configured to move through the hollow actuator rod by rotation of a caging bolt, the caging bolt assembly disposed along the through-hole of the adaptor housing, in which a caging nut is coupled to an end of the caging bolt, the caging bolt assembly comprising:
• a caging bolt body having a caging bolt head at an upper end and an indicator insertion hole;
• an indicator coupled in an axial direction through the caging bolt body;
• a nut stopper coupled to an end of the indicator;
• the caging nut screw-coupled to an outer circumferential surface of the caging bolt body;
• and
• an elastic structure between the indicator and the caging bolt body,
• wherein the indicator comprises:
• a rod body having a predetermined diameter;
• a rod head stepped with a larger diameter than the rod body at an upper end of the rod body;
• and
• a stopper coupling groove configured to allow for coupling of the nut stopper below the rod head,
• wherein a side of the elastic structure is configured to contact a stepped portion with the rod head and an opposite side of the elastic structure contacts an upper step portion in the bolt body,
• wherein the indicator insertion hole comprises:
• an upper insertion hole configured to restrict a movement of the rod head of the indicator;
• a lower insertion hole configured to define an insertion area of the nut stopper;
• and
• an intermediate insertion hole which is a space connecting the upper insertion hole to the lower insertion hole, the intermediate insertion hole having a smaller diameter than the lower insertion hole and the upper insertion hole,
• wherein the nut stopper comprises:
• a stopper plate having a plate shape;
• and
• a stopper coupling hole extended on an inner surface of the stopper plate and fit-coupled to the stopper coupling groove of the indicator to maintain the stopper plate in an axially fixed position,
• wherein the stopper plate is inserted into the lower insertion hole of the caging bolt body and is held in place by engagement with the stopper coupling groove of the indicator,
• wherein the stopper plate surrounds a stopper coupling portion of the indicator and contributes to preventing separation of the caging nut disposed through the caging bolt,
• wherein a separation of the caging nut is prevented through the nut stopper coupled to the end of the indicator disposed through the caging bolt to prevent the separation of the caging nut which moves up and down by the rotation of the caging bolt in the actuator rod.