Patent ID: 9156458
Filing Date: 2015-10-13
Classification: B60T,F16D

Abstract:
1. A brake actuator, comprising: a housing defining a service brake chamber and a parking brake chamber; a service diaphragm disposed within said service brake chamber; a service pushrod disposed on a first side of said service diaphragm a parking diaphragm disposed within said parking brake chamber; a parking pushrod extending through said parking diaphragm, said parking pushrod having a first end disposed on a first side of said parking diaphragm and extending into said service brake chamber and disposed on a second side of said service diaphragm, said parking pushrod defining a first plurality of teeth; a spring disposed within said service brake chamber on said first side of said service diaphragm and biasing said service pushrod to a service release position and said parking pushrod to a parking release position; a clutch disposed about said parking pushrod and defining a clutch tooth on a radially inner surface configured for intermittent engagement with said first plurality of teeth of said parking pushrod; and a clutch actuator configured to control rotation of said clutch wherein introduction of fluid on said second side of said service diaphragm urges said service pushrod away from said service release position towards a service apply position, introduction of fluid on a second side of said parking diaphragm urges said parking pushrod away from said parking release position towards a parking apply position and said service pushrod away from said service release position towards said service apply position.