Overview of Sheargard Couplings

Sheargard couplings are designed to provide flexible, reliable torque transmission with overload protection and minimal backlash. The product range includes flexible chain couplings, ES & KE elastic couplings, and standard overload clutches with wedge torque settings.

1. Sheargard Flexible and Chain Couplings

• Flexible Chain Couplings: Combine the standard Cross Sheargard unit with chain coupling to offer stock overload couplings that accommodate shaft misalignment and provide continuous overload protection.
• Torque and Misalignment: Torque ratings range from 33 Nm to 3468 Nm with angular misalignment typically up to 0.7° to 1.0° depending on model.
• Dimensions: Detailed dimensional data (A, B, C, D, E, F) are provided for each coupling size, facilitating correct selection and installation.

2. Sheargard ES & KE Couplings

• Designed for high-speed drives (>500 rpm) with low inertia and torsional elasticity to damp vibrations and absorb shocks.
• ES Couplings use cast iron jaws with hard rubber drive elements; KE Couplings use cast iron jaws with Pebax polyester elastomeric gear rings.
• Available with taper-bore bushes for ease of mounting.
• Torque ratings and misalignment capabilities are specified, with angular misalignment up to 1.0°.

3. Torque Ratings and Wedge Selection

• Torque settings are adjustable via standard wedge pins, color-coded for easy identification.
• Torque ratings are accurate within ±10%, with design recommendations to set torque at least 15% above maximum starting torque to avoid unnecessary tripping.
• Wedges are available in brass (sizes 350SG to 900SG) or steel (other sizes).
• For critical torque settings, mixing wedge colors allows intermediate torque values.
• Optional motor monitor assemblies with limit switches or proximity sensors can be used to shut off power during overload conditions.

4. Maintenance and Servicing

• Minimal routine servicing required; mainly checking wedge locating screws and monitor plate screws for security.
• After overload events, broken wedge halves must be removed and replaced with wedges of the same color and torque rating.
• Periodic disassembly, cleaning with paraffin, and light greasing of bearing surfaces recommended during major maintenance shutdowns.

5. Technical Data Highlights

• Coupling sizes range from 350SG to 1000SG and above, with torque capacities from 33 Nm up to 37,500 Nm.
• Misalignment capabilities vary by coupling type, typically from 0.31° to 1.0° angular misalignment.
• Dimensional tables provide bore sizes, coupling dimensions, and torque ratings for each model.
• Wedge torque ratings tables provide detailed torque values for different wedge color combinations and clutch sizes, supporting precise torque setting and customization.

Critical Recommendations and Limitations

• Running torque should not exceed 50% of the maximum torque rating to ensure longevity and reliability.
• Use the minimum number of wedges for simplicity and cost-effectiveness in maintenance and stock control.
• For drives operating above 120 rpm or requiring enhanced protection, use motor monitor assemblies to prevent damage from overloads.
• Taper bore versions are shorter and can be supplied with coupling halves fitted either from the hub end or coupling end.

This document provides comprehensive technical specifications, dimensional data, torque ratings, and maintenance guidelines for Sheargard couplings, enabling proper selection, installation, and operation in industrial drive applications.