LOVEJOY

Lovejoy jaw coupling spiders are available in several elastomeric materials, each suited for different operating conditions. Common options include Buna N rubber, which offers good oil resistance and moderate damping; urethane, which provides higher torque capacity and wear resistance; and Hytrel with bronze, which combines polyester elastomer with bronze particles for enhanced strength and temperature tolerance. The specific material is indicated by a numerical code in the product specifications, such as 792 for Buna N rubber or 2.951 for urethane. Selection depends on factors like torque load, misalignment, ambient temperature, and exposure to chemicals.

Lovejoy jaw coupling hubs are designated by coupling size codes such as AL050, L050, L070, L110, and L150. These codes correspond to specific outside diameters and overall lengths. For example, an L070 hub has a 1 23/64 in outside diameter and a 1 63/64 in overall length. To select the correct size, match the hub dimensions to the shaft diameters and the required torque capacity. The hub bore must fit the shaft, and the spider must be compatible with the hub size. Refer to Lovejoy's catalog for torque ratings and bore ranges for each size.

Yes, Lovejoy double universal joints, such as the DD-3 model, are supplied as machinable units. These are made from carbon steel and can be modified by the end user to achieve a specific overall length or to add features like keyways or set screw holes. The standard overall length for the DD-3 is 4 1/2 in, but the joint body can be cut or drilled as needed for the application. This flexibility allows integration into existing drive trains without requiring custom-manufactured parts.

Lovejoy L-series and AL-series coupling hubs differ primarily in size and torque capacity. The AL-series (e.g., AL050) is a smaller, lighter-duty hub designed for fractional horsepower applications, with outside diameters around 1 5/64 in. The L-series (e.g., L050, L070, L110, L150) covers a broader range of sizes for higher torque loads, with outside diameters up to 3 5/16 in for the L110. Both series use the same jaw coupling design and accept compatible spiders, but the L-series hubs are more common in industrial machinery requiring higher power transmission.

Yes, Lovejoy jaw couplings are designed to accommodate angular, parallel, and axial misalignment within specified limits. The elastomeric spider compresses and deforms to absorb misalignment while transmitting torque. The amount of allowable misalignment depends on the coupling size and spider material. For example, a Buna N spider typically allows up to 1 degree angular misalignment and 0.015 in parallel misalignment per inch of hub separation. Proper installation within these limits reduces vibration and extends equipment life.

Yes — 3G Electric (S) Pte. Ltd. supplies LOVEJOY products. We stock the LOVEJOY catalog and supply genuine factory-original products with full manufacturer warranty and technical support.