Patent ID: 11879510
Assignee: BENDIX COMMERCIAL VEHICLE SYSTEMS LLC
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  B | IPC B  F

Claim 0:
1. A method of manufacturing a camshaft for a drum brake, comprising:
forming a tubular camshaft having
a first end portion configured for coupling to a brake actuator,
a second end portion defining a cam configured to engage cam followers coupled to first and second brake shoes, rotation of the cam causing the first and second brake shoes to move between positions of engagement and disengagement with an associated braking surface;
a first intermediate portion disposed between the first and second end portions;
a second intermediate portion between the first intermediate portion and one of the first end portion and the second end portion, the second intermediate portion configured to support a first bearing; and,
a third intermediate portion between the first intermediate portion and the other of the first end portion and the second end portion, the third intermediate portion configured to support a second bearing,
wherein a wall thickness of at least one of the first and second end portions and the first intermediate portion is configured to achieve at least one of a predetermined torsional stiffness in the camshaft and vibration damping in the camshaft at a selected frequency; wherein a wall thickness of the second intermediate portion is greater than a wall thickness of the first intermediate portion; and,
forming the camshaft as a unitary body.