Arbori de transmisie avansați pentru sisteme de alimentare cu tocătoare de lemn

25° Articulation

Engineered to handle extreme operating angles as feed rolls traverse their full vertical range without torque loss or vibration.

Shock Factor K=2.5

Designed with a high service factor to absorb the violent impact when chipper knives strike hard knots or frozen timber.

Acoperit cu Rilsan®

Splines feature advanced coating to reduce sliding friction by 60%, preventing axial loading on gearboxes.

IP65 Protection

Multi-lip sealing systems specifically designed to exclude fine wood dust and sawdust from the bearing cups.

G6.3 Balanced

Dynamic balancing ensures smooth operation even at high feed speeds, protecting the entire drivetrain structure.

1. The Telescoping Challenge

In a disc or drum chipper infeed, the drive shaft length changes constantly. When torque is applied, standard metal-on-metal splines experience high friction coefficients. This resistance to sliding means that as the feed roll tries to move up, the shaft resists, transmitting force axially. This often destroys the output bearings of the gearbox. EVER-POWER utilizes an involute spline geometry coated with Rilsan. This creates a permanent, low-friction interface that allows the shaft to telescope effortlessly even under full torque load, preserving your capital equipment.

2. Dealing with “Sawdust Ingress”

Woodyards are notoriously dusty environments. Fine pine or hardwood dust acts as an abrasive when mixed with grease. Standard agricultural seals are insufficient here. Our industrial series shafts feature a Metal-Shielded Triple-Lip Seal design. The outer shield deflects large chips, while the labyrinthine inner lips prevent micro-dust from contaminating the needle bearings. This extends the re-lubrication interval and total service life significantly.

3. Vibration and Harmonics

Chipper knives impact wood typically 4 to 8 times per revolution of the disc. This creates a high-frequency vibration harmonic that travels back through the infeed system. If the drive shaft is not dynamically balanced or if the natural frequency matches the chipper speed, resonance occurs. We balance every shaft to ISO 1940-1 Grade G6.3 and use oversized tubing to shift the critical speed well above the operating range, ensuring smooth power delivery.

4. Material Metallurgy

The yokes (forks) of the universal joint bear the brunt of the shock load. Cast iron yokes are prone to cracking under the impact of frozen timber (common in European winters). EVER-POWER uses Oțel aliat forjat (42CrMo4) for all yokes and flange connections. This material provides the ductility needed to absorb shock without fracturing, offering a safety margin essential for heavy industrial processing.

Client Success: Revitalizing a Paper Mill Woodyard in Eerbeek

Provocarea: A prominent cardboard manufacturer in the Netherlands’ Eerbeek paper district faced frequent downtime on their drum chipper line. The OEM drive shafts on the upper feed rollers were seizing every 3 months. The culprit? Fine sawdust contamination and spline galling caused by the constant vertical jumping of the rollers on irregular pine logs.

Soluția: EVER-POWER engineers conducted an on-site vibration analysis. We replaced the failing units with our Custom SWC-I Woodyard Series shafts. These featured Rilsan-coated splines for frictionless telescoping and an enhanced triple-lip labyrinth seal system.

Rezultatul: The new shafts have been operational for 18 months without a single spline seizure. The mill reports a 15% reduction in woodyard maintenance costs and improved chip quality due to consistent feed rates.