Star Elastic Coupling Common Models & Specifications: XL Series Complete Guide

Introduction to Star Elastic Couplings

The XL series star elastic coupling, standardized under GB/T 2496-2003, represents a category of flexible coupling solutions that utilize a star-shaped elastomer (typically polyurethane material) to connect two coupling halves. These couplings excel at cushioning, vibration damping, and compensating for relative shaft misalignment (radial, angular, and axial). They are widely employed in mechanical transmission systems for connecting equipment such as motors, pumps, and reducers. At ApexCoupling, we specialize in manufacturing high-quality flexible couplers including the XL series and various jaw coupling spider configurations to meet diverse industrial needs.

XL Series Model Designation System

XL coupling models follow a “XL + number” designation system, where the number indicates the specification size (e.g., XL1, XL2 through XL12). Different models correspond to varying nominal torque ratings, allowable speeds, shaft bore diameter ranges, and structural dimensions.

Model Breakdown:

• Prefix “XL”: Represents the basic type star elastic coupling

• Specification Code (1-12): Higher values indicate greater load-bearing capacity

• Shaft Bore Form and Dimensions: Including Y-type long cylindrical bore, J/J1-type short cylindrical bore, Z-type tapered bore

• Keyway Form: A-type standard keyway, B/B1-type 1:10 tapered keyway

Technical Specifications Overview

Note: Allowable speed varies with half-coupling material (steel half-couplings allow higher values, cast iron lower values)

Structural Detailed Analysis

The XL series star elastic coupling consists of two half-couplings and a star elastomer, featuring compact design and easy installation.

1. Half-Couplings

Materials: Typically carbon steel (Q235, 45 steel) or cast iron (HT200). Aluminum alloy (LD7) may be used for high-speed applications to reduce rotational inertia.

Structural Features:

• Connection End: Machined with shaft bore and keyway (A/B type), some models support shrink disc connection (keyless design for improved torque transmission)

• Elastomer Mounting End: Outer circumference distributes 3-6 claws (XL1-XL3 models have 3 claws, XL4 and above have 6 claws) that engage with elastomer grooves, transmitting torque through the elastomer

• Tolerances and Precision: Shaft bore fit tolerances follow H7/k6 or H7/m6, keyway dimensions comply with GB/T 1095 standard, ensuring reliable shaft connection

2. Star Elastomer

Materials: Polyurethane (PU) or nitrile rubber (NBR). Polyurethane offers wear resistance, oil resistance, and temperature tolerance (-30℃ to +80℃, briefly up to +100℃)

Structure:

• Star-shaped radial design with center hole fitting half-coupling claws

• Compensates shaft misalignment through elastic deformation (radial compensation ≤0.1-0.8mm, angular compensation ≤1°-1.5°, axial compensation ≤1-5mm, increasing with model size)

• Functions: Absorbs vibration, reduces shock loads, prevents shaft system damage from rigid connections, allows for installation alignment errors

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Installation Dimensions and Compatibility

Shaft Bore Forms:

• Y-type: Long cylindrical bore, suitable for long shaft end connections

• J/J1-type: Short cylindrical bore, for space-constrained applications

• Z-type: Tapered bore (1:10 taper) with set screws, suitable for applications requiring high axial positioning accuracy

Overall Length (L):

Composed of the combined length of two half-couplings, requiring reserved space for elastomer installation to ensure tight contact between elastomer and claws after assembly without clearance.

Applications and Selection Guidance

These flexible couplers find extensive applications in:

• Motor to pump connections

• Reducer output systems

• Conveyor drive systems

• Industrial fan applications

• Food processing machinery

For applications requiring specific configurations like 4 inch flexible rubber coupling solutions, ApexCoupling offers customized options to meet exact dimensional and performance requirements.

Comparison with Other Flexible Coupling Types

While the XL series represents excellent flexible coupling solutions, other types like jaw coupling spider configurations offer alternative advantages:

• Jaw coupler designs provide different elastomer engagement characteristics

• 1 flexible coupling options suit specific space constraints

• Various flexible couplers address unique application requirements

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Why Choose ApexCoupling for Your Star Elastic Coupling Needs?

At ApexCoupling, we combine manufacturing expertise with technical knowledge to deliver reliable power transmission solutions:

• Comprehensive range of XL series couplings from XL1 to XL12

• Custom flexible couplers tailored to specific application requirements

• High-quality jaw coupling spider components for various industrial applications

• Technical support for proper coupling selection and installation

• Quality assurance through strict manufacturing standards

Our flexible coupling products undergo rigorous testing to ensure they meet performance specifications and deliver long service life in demanding operating conditions.

Need assistance selecting the right star elastic coupling for your application?
Contact ApexCoupling’s technical team for expert guidance on XL series couplings, jaw coupling spider solutions, and other flexible couplers. We’ll help you identify the optimal model and specification based on your torque, speed, and misalignment compensation requirements.