🔩 Centre Coupling – Leyland L/L 2214
📌 What It Is
The centre coupling flange (also known as the centre joint coupling) is a driveline component used on vehicles with a multi‑piece propeller shaft. It joins the front and rear sections of the propeller shaft, allowing torque to be transmitted from the gearbox to the rear differential while accommodating slight axial/angle movement due to suspension travel and chassis flex.
⚙️ Vehicle Application
Truck Models: Leyland L/L 2214 (medium/heavy commercial truck)
Propeller Shaft Setup: Multi‑section with center bearing/coupling
Function: Connects two halves of the propeller shaft via a bolted, splined interface
Drivetrain Path:
Gearbox → Front Propeller Shaft → Centre Coupling → Rear Propeller Shaft → Rear Differential
📋 Typical Specifications (Aftermarket / Catalog Reference)
From parts catalogs covering Leyland driveline couplings:
Attribute
Specification (Approx)
Part Type
Centre Joint Coupling Flange
Application
Leyland L/L 2214
Spline Count
34 splines/teeth
Plate Type
Round flange
Plate Diameter
~175 mm
Bolt Holes
8 holes
Bolt Size
~9.50 mm (15No)
Bolt Circle & Height
Typical heavy‑truck pattern for centre bearing flange
OEM Application
Centre Coup. L/L 2214
Catalog Reference
K152 entry in coupling parts list (Leyland centre coupling)
📌 Note: Some catalogs also show a centre “patti” coupling variant for L/L 2214 (same splines, different flange face), but the round centre joint coupling is the standard type used in most propeller shaft assemblies.
🛠️ How It Works
✔ Torque Transmission: Splined faces on the centre coupling allow power to pass smoothly from the front half to the rear half of the propeller shaft.
✔ Misalignment Accommodation: Allows slight movement/offset between shaft halves due to suspension action and road irregularities.
✔ Vibration Damping: Helps reduce driveline vibration when paired with a centre bearing support.
This component is essential for longer propeller shafts where a single shaft cannot be used due to vehicle length or packaging constraints.
📌 Where It Fits
In the Leyland L/L 2214 drivetrain, the centre coupling sits between front and rear propeller shafts, usually supported by a centre bearing assembly mounted to the chassis: