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{"title":"Cast Iron FCL Coupling Standard Size Flexible Jaw Coupling with Easy Installatio","imgUrl":"https:\/\/img.chinax.com\/nimg\/1d\/8b\/76fff8f1e7c3076e235522f571f8-200x200-1\/cast_iron_fcl_coupling_standard_size_flexible_jaw_coupling_with_easy_installation.jpg","attrs":{"Structure":"flexible","Type":"FCL Coupling","Brand Name":"3Arubber","Model Number":"3A2006"}}
{"title":"Hb Type Smooth Surface Rubber Coupling with 1.25g\/cm3 Density and High Tensile","imgUrl":"https:\/\/img.chinax.com\/nimg\/f3\/a4\/90e01b825e91542cebb1079b03ba-200x200-1\/hb_type_smooth_surface_rubber_coupling_with_1_25g_2fcm3_density_and_high_tensile_strength.jpg","attrs":{"Color":"yellow, red,blask,purple","Density":"1.25g\/cm\u00b3","Elongation":"350%","Size":"standard size"}}
{"title":"F40-F250 NBR Rubber Tyre Coupling with Shock Absorption for Industrial","imgUrl":"https:\/\/img.chinax.com\/nimg\/99\/96\/cc36748ece95d8001e0e8154493e-200x200-1\/f40_f250_nbr_rubber_tyre_coupling_with_shock_absorption_for_industrial_applications.jpg","attrs":{"type number":"F40 - F250","Payment Terms":"T\/T,Western Union,L\/C,D\/P","color":"black","Brand Name":"3A Rubber"}}
{"title":"Black HRC Type Polyurethane Coupling with 8Mpa Tensile Strength and High Wear","imgUrl":"https:\/\/img.chinax.com\/nimg\/2d\/3b\/3c425558edd5da5ba5fbecd9bebd-200x200-1\/black_hrc_type_polyurethane_coupling_with_8mpa_tensile_strength_and_high_wear_resistance.jpg","attrs":{"Color":"Black Color","Density":"1.4g\/cm3","Brand Name":"3A Rubber","Model Number":"3A2006"}}
{"title":"HRC Rubber Polyurethane Coupling Spider HRC70 HRC90 HRC110 Size with 1.4g\/cm3","imgUrl":"https:\/\/img.chinax.com\/nimg\/f5\/c3\/5aa4dd8d8dd2e3d8bae36d11c548-200x200-1\/hrc_rubber_polyurethane_coupling_spider_hrc70_hrc90_hrc110_size_with_1_4g_2fcm3_density_and_black_rubber_or_polyurethane_material.jpg","attrs":{"Brand Name":"3A Rubber","Model Number":"3A2006","Place of Origin":"China","Minimum Order Quantity":"1piece"}}
Structural Features: Consists of two metal half-couplings with convex lobes (typically 8 lobes, forming an octagonal shape) and a central rubber elastomer (plum blossom pad).
Working Principle: Torque is transmitted through the rubber plum blossom pad between the lobes, utilizing rubber's elasticity to:
Absorb shock and vibration
Compensate for misalignment: Accommodates minor axial, radial, and angular offsets
Provide electrical insulation
Applications: Widely used in drive systems for pumps, fans, compressors, motors, gearboxes, etc.
Core Component: Rubber Cushion Block / Elastic Element / Plum Blossom Pad
Function: The core damping element, directly impacting coupling performance.
Names: Commonly called Plum Blossom Pad (due to its shape), Cushion Block, Elastic Element, or Cushion Ring.
Material: Typically Polyurethane (PU) or Nitrile Rubber (NBR):
Polyurethane (PU): Wear-resistant, tear-resistant, high load capacity (most common)
Nitrile Rubber (NBR): Excellent oil resistance (suitable for oily environments)
Model Identification: R42, R62, R82, R103, R132, etc., are specification models of the plum blossom pad. Numbers typically indicate the coupling size or bore diameter range (unit: mm) they are designed for.
Common Plum Blossom Pad Models & Specifications
Below are typical specifications for common models (Note: Standards may vary slightly between manufacturers. Always verify with physical measurements or the manufacturer's selection chart!):
Pad Model
Typical Bore Dia. Range (mm)
Suitable Coupling Size/Torque Range
R42
≈ 20 - 30
Small couplings, low torque
R62
≈ 25 - 40
Small-to-medium couplings
R82
≈ 40 - 60
Medium couplings
R103
≈ 50 - 75
Medium-to-large couplings
R132
≈ 70 - 100+
Large couplings, high torque
Key Points for Purchase & Replacement
Identify Original Model: Remove the old pad and check for stamped model (e.g., R42). Measure key dimensions: Outer Diameter (OD), Inner Diameter (ID), Thickness (H), Number of Lobes (usually 6 or 8).
Match Coupling Specifications: The pad model MUST correspond to the coupling body model.
Consider Operating Conditions: Ensure the pad can handle the load. Choose NBR for oily conditions; wear-resistant PU for general use. Confirm the rubber's temperature tolerance.
Brand & Quality: OEM parts offer best compatibility. Reputable brands (e.g., R+W, KTR, Lovejoy, OTM) provide higher reliability.
Replacement Steps (Simplified)
Shut down equipment and isolate power (safety first)
Remove coupling guard
Loosen coupling bolts
Remove old pad and clean mating surfaces
Insert new plum blossom pad into the lobes of one half-coupling
Align the other half-coupling and gently push together
Tighten bolts diagonally to the specified torque
Reinstall guard
Summary
OTM octagonal couplings rely on plum blossom pads (e.g., R42/R62/R82/R103/R132) for cushioning. Precisely match the model and dimensions during replacement, considering operational needs. Source pads through official channels or contact OTM suppliers with parameters for procurement.
Please provide the dimensions of your old part or your equipment model for precise pad specification confirmation!
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