Inside brake camshafts
Mark Todd, general manager at Diesel Technic UK, takes a closer look at one of the key components in drum brakes, the brake camshaft
Brake camshafts are integral to the operation of drum brakes. Their primary function is to transfer the power generated by the pneumatic brake cylinder, through a slack adjuster, to both brake shoes. This transfer of power enables the cantilevered brake shoes to exert pressure on the brake drum, thereby slowing down or bringing the wheel to a standstill.
Components and Mechanism
- Splined teeth on the Drive Side: a key feature of brake camshafts is the tooth system installed on the drive side. This tooth system serves as a mechanism to hold the slack adjuster in place, ensuring a secure connection between the brake camshaft and the adjuster.
- S or Z cam profile on the Output Side: on the output side of the brake camshaft, the cam spreads the brake shoes apart when the camshaft is actuated. As the camshaft rotates, the cam pushes against the brake shoes, causing them to move outward and press against the brake drum.
- Brake Shoe Actuation: upon actuation of the brake camshaft, the cam engages with both cantilevered brake shoes. This engagement results in the simultaneous movement of the brake shoes towards the brake drum. As a result, friction is generated between the brake shoes and the drum, leading to the deceleration or stopping of the wheel.
When it comes to the reliability and longevity of braking systems in heavy-duty vehicles, every component must meet stringent standards.
High-Quality Construction
DT Spare Parts brake camshafts are machine manufactured from high-quality tempered steel, ensuring durability and resilience even under the toughest operating conditions. The use of tempered steel enhances the strength of the camshafts, to withstand the forces exerted during braking.
Inductive Hardening for Longevity
One of the key factors contributing to the longevity of DT Spare Parts brake camshafts is the inductive hardening process applied to the cams, bearing seats of the brake shaft bushing, and serration. This specialised hardening technique increases the surface hardness of these critical components, thereby enhancing their resistance to wear and prolonging their service life. With DT Spare Parts brake camshafts, users can expect reliable performance over an extended period, reducing the need for frequent replacements and maintenance.
Precision Machining for Optimal Fit
DT Spare Parts brake camshafts are precision-machined with extremely narrow tolerances in all areas. This meticulous machining process ensures that each camshaft conforms precisely to the manufacturer’s specifications, guaranteeing optimal fitting accuracy. By adhering strictly to these specifications, DT Spare Parts brake camshafts seamlessly integrate into the braking system, for optimum performance.
Construction of Brake Camshafts
- Serration: meticulously designed to ensure optimal engagement with other brake system components, facilitating smooth and effective operation.
- Actuation Cam: Serving as the pivotal component responsible for spreading the brake shoes apart, engineered for durability and precise functionality.
- Bearing Seat of the Brake Camshaft: provides a secure and stable mounting point, ensuring proper alignment and performance of the camshaft within the braking system.
In addition to all standard brake camshafts, the comprehensive DT Spare Parts range also includes a variety of repair kits. Check out the Diesel Technic Partner Portal for full details.
