What is the recommended minimum thickness for replacing the Upper Friction Disc?

The Upper Friction Disc should be replaced when the friction lining wears down to a thickness of 2.0mm, as measured from the original 3.2mm. This limit ensures that the steel backing is not exposed and that the disc maintains sufficient heat capacity. Using a disc beyond this limit can lead to reduced torque capacity and potential damage to the mating components. Regular inspection every 500 operating hours is advised, using a caliper to measure lining thickness at multiple points. If uneven wear exceeds 0.3mm, the disc should also be replaced to avoid vibration and brake fade.

Can the Upper Friction Disc be used in wet braking environments?

The standard Upper Friction Disc with sintered bronze lining is designed for dry braking applications. In wet environments, the friction coefficient may drop by up to 30%, affecting braking performance. However, if wet operation is unavoidable, we recommend a modified version with additional grooves and a sealant coating (available upon request). For continuous wet use, consider our specialized wet friction discs with a higher porosity lining. Always consult the system manufacturer to ensure compatibility and adjust braking force accordingly.

How does the Upper Friction Disc differ from the lower friction disc in the same assembly?

The Upper Friction Disc features a slightly harder lining (HB 60-80) compared to the lower disc (HB 50-70), because the upper disc typically experiences higher initial engagement forces and less heat dissipation due to its position. This difference ensures balanced wear across the pair. Additionally, the upper disc has a 0.8mm lining thickness, while the lower disc may have 1.0mm, allowing for more wear on the lower disc which operates at slightly lower temperatures. Always replace both discs as a set to maintain optimal braking performance.

Upper Friction Disc

200mm OD Sintered Bronze Upper Friction Disc for Heavy-Duty Braking

The upper friction disc is a precision-engineered component designed for industrial braking systems, featuring a 200mm outer diameter and 3.2mm thickness. Its sintered bronze friction lining ensures consistent torque transfer of up to 450 Nm and reliable performance across a temperature range of -40°C to 350°C.

Thickness

3.2 mm

Friction Lining Material

Sintered Bronze

Operating Temperature Range

-40°C to 350°C

Torque Capacity

450 Nm

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How Does the 200mm Sintered Bronze Upper Friction Disc Enhance Braking Reliability?

The Upper Friction Disc is a critical component in industrial braking assemblies, specifically designed as the upper disc in dual-disc systems. With a 200mm outer diameter and 120mm inner diameter, it fits standard hubs and provides a substantial friction surface area. The 3.2mm thickness is optimized for heat dissipation and structural integrity under high loads. The sintered bronze lining, applied through a powder metallurgy process, offers a stable coefficient of friction (0.35-0.45) and excellent resistance to fade at temperatures up to 350°C. This disc is engineered for applications requiring precise torque control, such as in mining hoists, construction cranes, and heavy-duty conveyors.

In mining and construction, braking systems face extreme conditions: high impact loads, abrasive dust, and continuous operation. The Upper Friction Disc addresses these challenges through its sintered bronze lining, which maintains friction stability even when contaminated with dust or moisture. Unlike organic linings, sintered bronze does not degrade rapidly under heat, ensuring consistent braking force over thousands of cycles. The disc's 450 Nm torque capacity is suitable for mid-sized equipment, providing a safety margin without overloading the system. Additionally, the bronze matrix dissipates heat quickly, reducing the risk of brake fade during repeated stops.

Compared to lower friction discs in the same series, the Upper Friction Disc features a slightly harder lining compound (HB 60-80) to handle the higher initial engagement forces typical of upper disc positions. This results in more uniform wear across the pair and extends the overall service interval. The disc is also available with optional grooves for improved debris shedding, further enhancing performance in dirty environments. With a balanced combination of thermal stability, wear resistance, and torque capacity, this disc is a reliable choice for demanding industrial braking applications.

Sintered bronze lining with 0.35-0.45 coefficient of friction for consistent braking.
Operates effectively from -40°C to 350°C, suitable for extreme environments.
450 Nm torque capacity and 200mm OD for mid-sized industrial equipment.

Core Technical Features and Quantified Advantages

STEP 1

Sintered Bronze Lining with 0.35-0.45 Friction Coefficient

The friction lining is produced via sintering bronze powder onto a steel backing, creating a porous structure that maintains a stable coefficient of friction between 0.35 and 0.45. This ensures predictable braking force even under varying loads and speeds. The sintered layer is 0.8mm thick and has a hardness of HB 60-80, providing excellent wear resistance. Unlike organic linings, it does not contain resins that degrade at high temperatures, allowing continuous operation at up to 350°C without fade.

STEP 2

200mm Outer Diameter and 120mm Inner Diameter for Standard Hubs

With a 200mm outer diameter and 120mm inner diameter, this disc fits common shaft sizes in industrial braking systems, eliminating the need for custom adapters. The 3.2mm thickness provides a balance between heat capacity and weight, reducing rotational inertia while maintaining structural rigidity. The disc is precision-ground to a flatness tolerance of 0.05mm, ensuring uniform contact with the friction pad and minimizing vibration during braking.

STEP 3

450 Nm Torque Capacity for Mid-Sized Equipment

The Upper Friction Disc is rated for a maximum torque of 450 Nm, making it suitable for mid-sized mining hoists, construction cranes, and conveyors. This capacity is derived from the friction surface area and the lining's shear strength, tested according to SAE J661 standards. The disc's design includes a 10mm wide friction ring, which optimizes pressure distribution and reduces edge loading, thereby extending the life of both the disc and the mating pad.

STEP 4

Operates from -40°C to 350°C with Thermal Stability

The sintered bronze lining maintains its friction properties across a wide temperature range from -40°C to 350°C, thanks to the absence of organic binders that degrade at high temperatures. The steel core is made from 65Mn spring steel, which retains its strength and elasticity even after repeated thermal cycling. This makes the disc reliable in both cold storage applications and high-temperature industrial environments, such as foundries and steel mills.