Mechanical actuating device for a spot-type disc brake
AssigneeITT Industries, Inc.
InventorsAlfred Birkenbach, Helmut Franke
Life of this patent
Estimating the term…
Abstract
The brake actuating device is disposed in a cylindrical bore of a disc brake caliper leg and comprises an actuating spindle and an actuating nut interconnected by a ball bearing thread. The actuating spindle has a central bore receiving an adjusting spindle surrounded by a sleeve, one end of which is connected to an adjusting nut threaded onto the adjusting spindle and transmitting the actuating force thereon. The other end of the sleeve is accessible through a bore from the outside of the caliper leg and can be turned with a tool in order to reset the adjusting nut for replacement of the worn brake pads.
Claims17
A mechanical actuating device for a spot-type disc brake comprising:
- a brake caliper embracing a brake disc having a cylindrical bore disposed in one leg thereof, said bore having a longitudinal axis parallel to an axis of rotation of said brake disc;
- an actuating spindle disposed in said bore coaxial of said longitudinal axis;
- an actuating nut disposed in said bore coaxial of said longitudinal axis cooperating with said actuating spindle in a manner to advance a brake shoe actuating member when an axial relative displacement between said actuating spindle and said actuating nut occurs due to a relative rotation between said actuating spindle and said actuating nut caused by an actuating means connected to one of said actuating spindle and said actuating nut;
- and
- an automatic brake pad clearance adjusting device disposed in said bore coaxial of said longitudinal axis including
- an adjusting spindle disposed coaxial of said longitudinal axis connected to and extending away from a surface of said brake shoe actuating member remote from said brake disc, said adjusting spindle and said brake shoe actuating member being locked to each other to prevent rotational movement thereof,
- an adjusting nut disposed coaxial of said longitudinal axis threaded on said adjusting spindle and accessible from the outside of said one leg remote from said brake disc for turning thereof during brake pad replacement, and
- a clutch device disposed coaxial of said longitudinal axis associated with said adjusting nut to cause said adjusting spindle to execute a rotary motion advancing said adjusting spindle toward said brake disc, said clutch device becoming effective during a brake application when a nominal brake pad clearance is exceeded;
- said actuating nut and said actuating spindle transmitting their relative axial displacement to said adjusting nut;
- said adjusting nut and said adjusting spindle are subjected to the force of a spring in a brake release direction;
- and
- said spring is a cup spring acting between said leg and said adjusting nut. PG,15
Dependencies are inferred from the claim text.