Customizable Rubber Coupling for Coupling Spider in R82 OD78mm x ID31mm x T18mm in Black Color

OMT Rubber Coupling Spider, Rubber Spider, Couping Spider

black color rubber material

R42, OD42mm x ID19mm x T14mm

R62, OD59mm x ID29mm x T16mm

R82, OD78mm x ID31mm x T18mm

R103, OD99mm x ID42mm x T21mm

R132, OD132mm x ID64mm x T26mm

1. OTM Octagonal Coupling (Jaw Coupling / Plum Blossom Coupling)

• 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.

2. 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.

3. Reference 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!):

4. Key Points for Purchase & Replacement

1. 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).

2. Match Coupling Specifications:

   • The pad model MUST correspond to the coupling body model.

3. Consider Operating Conditions:

   • Torque & Speed: Ensure the pad can handle the load.

   • Environment: Choose NBR for oily conditions; wear-resistant PU for general use.

   • Temperature: Confirm the rubber's temperature tolerance.

4. Brand & Quality:

   • OEM parts offer best compatibility. Reputable brands (e.g., R+W, KTR, Lovejoy, OTM) provide higher reliability.

5. Replacement Steps (Simplified)

1. Shut down equipment and isolate power (safety first).

2. Remove coupling guard.

3. Loosen coupling bolts.

4. Remove old pad and clean mating surfaces.

5. Insert new plum blossom pad into the lobes of one half-coupling.

6. Align the other half-coupling and gently push together.

7. Tighten bolts diagonally to the specified torque.

8. 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!