US 12,296,799 B2
Actuator for drum brake assembly
Kraig Gerber, Plymouth Township, MI (US); and Galus Chelaidite, South Lyon, MI (US)
Assigned to ZF ACTIVE SAFETY US INC., Livonia, MI (US)
Filed by ZF Active Safety US Inc., Livonia, MI (US)
Filed on Sep. 16, 2022, as Appl. No. 17/946,079.
Prior Publication US 2024/0092331 A1, Mar. 21, 2024
Int. Cl. F16D 51/00 (2006.01); B60T 13/74 (2006.01); F16D 51/48 (2006.01); F16D 65/22 (2006.01); F16D 121/24 (2012.01); F16D 125/58 (2012.01)
CPC B60T 13/746 (2013.01) [F16D 51/48 (2013.01); F16D 65/22 (2013.01); F16D 2121/24 (2013.01); F16D 2125/582 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An electric actuator assembly for a drum brake assembly having a brake drum, comprising:
a housing;
a gear nut configured for rotation by a motor and provided in the housing;
a pin extending longitudinally within the housing and associated with a first clevis for receiving a first brake shoe; and
a spindle extending longitudinally within the housing and aligned with the pin, the spindle having a first threaded connection with a second clevis for receiving a second brake shoe and a second threaded connection with the gear nut, wherein the distance between the first clevis and the second clevis increases in response to rotation of the gear nut to move the brake shoes towards the drake drum, the second clevis being urged towards the first clevis in response to cooling of the brake drum in order to back drive the spindle and gear nut and thereby reduce the distance between the first clevis and second clevis.