How to Install a 2206 AV Nilos Ring (Step-by-Step Guide)

To correctly install the 2206 AV Nilos Ring, position it so the convex (open) side points toward the bearing raceway. The ring must seat flush against the bearing outer ring. The 2206 AV Nilos Ring has a design clearance c = 0.3 mm that must remain free from distortion. Use a flat drift or a press with even force around the circumference – never hammer directly on the seal.

What makes the 2206 AV Nilos Ring different

The 2206 AV Nilos Ring is a precision metal labyrinth seal, not a rubber lip seal. It consists of a formed steel ring with specific geometry. According to standard dimensions, this Nilos ring has an inner diameter (d) of 30 mm, outer diameter (D) of 56.2 mm, width (a) of 44 mm, and lip height (i) of 2.5 mm. The steel thickness (c) is 0.3 mm. This rigid design creates a non-contact labyrinth that retains grease while allowing free rotation, unlike rubber seals that create friction and wear.

Step-by-step installation of the 2206 AV Nilos Ring

1. Inspect the bearing and housing bore

Before installing the 2206 AV Nilos Ring, verify that the bearing outer ring and housing shoulder are clean, dry, and free of burrs. Any particle larger than 0.05 mm can lift the Nilos ring, destroying the precise 0.3 mm clearance.

2. Identify the correct orientation

Hold the 2206 AV Nilos Ring with the open side (the side with a visible groove or recess) facing the bearing inner ring. The flatter, closed side should face outward. Installing this Nilos ring backward will trap debris against the bearing, causing rapid wear.

3. Apply even seating pressure

Use an arbor press or hydraulic press with a flat sleeve that contacts only the outer rim of the 2206 AV Nilos Ring. The recommended seating force is 1.5 – 3.0 kN. If a press is unavailable, use a soft-faced mallet and a tubular drift that matches the outer diameter (56.2 mm). Tap in a star pattern – 6 to 8 light taps – to prevent tilting.

4. Verify final clearance and alignment

After seating the 2206 AV Nilos Ring, the radial gap between the ring and the bearing inner ring should be 0.2 – 0.4 mm. Use a feeler gauge at four points (0°, 90°, 180°, 270°). A variation larger than 0.1 mm indicates misalignment. The axial clearance (c) must remain at the designed 0.3 mm – any reduction means the Nilos ring is deformed.

Critical dimensions for the 2206 AV Nilos Ring

Accurate installation of this Nilos ring depends on matching the seal to the bearing dimensions. Below are the key tolerances:

• Inner diameter (d): 30.0 mm ±0.1 mm
• Outer diameter (D): 56.2 mm +0.1 / -0.0 mm
• Width (a): 44.0 mm ±0.2 mm
• Lip height (i): 2.5 mm ±0.05 mm
• Metal thickness (c): 0.3 mm ±0.02 mm

Deviations beyond these tolerances will either lock the bearing (if the Nilos ring is too tight) or allow contamination ingress (if too loose). Always measure before installation.

Common mistakes when installing a Nilos ring

• Reversed orientation: The 2206 AV Nilos Ring cannot purge debris when installed backward. Grease escapes within 50–100 hours instead of lasting thousands of hours.
• Overtightening or direct hammering: Distortion changes the c = 0.3 mm clearance to near zero. The Nilos ring rubs on the inner ring, causing heat and noise within minutes of operation.
• Eccentric seating: One side of the Nilos ring sits deeper than the other. This creates a variable gap (0.1 mm to 0.5 mm), allowing particles larger than 150 µm to enter the bearing.
• Using an undersized drift: A drift smaller than 56.2 mm concentrates force on the lip of the Nilos ring, permanently deforming the delicate labyrinth profile.

Avoid these errors by using a properly sized press tool (contact diameter = 56.2 mm) and double-checking orientation before seating the 2206 AV Nilos Ring.

How to confirm a successful Nilos ring installation

After pressing the 2206 AV Nilos Ring into the housing, perform two quick verification checks:

• Rotation test: Turn the bearing inner ring by hand. It must rotate smoothly with no scraping sound. Any resistance means the Nilos ring is touching the rotating part.
• Flush seating check: The outer edge of the 2206 AV Nilos Ring should be flush or recessed up to 0.1 mm below the housing face. Protrusion greater than 0.2 mm indicates incomplete seating.

If both conditions are met, this Nilos ring provides the intended labyrinth effect – retaining grease and blocking coarse dust (particles <30 µm are generally harmless).

Tools required for installing the 2206 AV Nilos Ring

• Arbor press or hydraulic press (recommended force: 1.5 – 3.0 kN)
• Flat, tubular drift with inner diameter >30 mm and outer diameter 56.2 mm
• Feeler gauge set (0.05 mm to 1.0 mm)
• Clean, lint-free cloth and isopropyl alcohol
• Digital caliper (to verify d=30 mm and D=56.2 mm before installation)

Using proper tools prevents distortion and ensures the 0.3 mm design clearance of the Nilos ring is maintained.

Frequently asked questions about the 2206 AV Nilos Ring

Can the 2206 AV Nilos Ring be reused after removal?

No. The 2206 AV Nilos Ring is a precision-formed metal component that deforms slightly during pressing. Removal almost always changes the c=0.3 mm thickness or creates flat spots on the labyrinth profile. Always use a new Nilos ring for reliable sealing.

What housing bore is required for this Nilos ring?

The 2206 AV Nilos Ring requires a housing bore of 56.2 mm H7 tolerance (typically 56.2 +0.03 / -0.0 mm). A bore larger than 56.25 mm will not secure the Nilos ring – it may spin or fall out. If the bore is worn, use a retaining compound specified for metal seals or replace the housing.

Should lubricant be applied to the Nilos ring before installation?

Lightly oil the housing bore and the outer rim of the 2206 AV Nilos Ring with a thin grease (e.g., NLGI 2). Do not let grease enter the labyrinth groove of the Nilos ring – it may attract abrasive dust. The inner clearance c = 0.3 mm should remain dry to function as a true labyrinth.

How does a Nilos ring compare to a rubber sealing ring?

Unlike rubber seals that create friction (0.1–0.3 Nm drag torque), the 2206 AV Nilos Ring is a non-contact metal seal – it adds near-zero friction. Rubber seals fail above 100°C while this Nilos ring withstands 200°C+. However, a Nilos ring cannot seal against liquids or very fine dust (<10 µm) as effectively as a contact lip seal. Choose based on your operating conditions.

Performance expectations after correct Nilos ring installation

When the 2206 AV Nilos Ring is installed properly (open side toward bearing, uniform 0.3 mm clearance, no distortion), the bearing will achieve:

• Grease retention: >95% of original grease after 2000 hours at moderate speeds (3000 rpm).
• Contaminant exclusion: Particles larger than 0.1 mm are blocked effectively.
• Temperature rise: Less than 10°C above ambient due to the non-contact labyrinth design of the Nilos ring.

Deviations from the installation procedure cause premature bearing failure within 50–200 hours. Always treat the 2206 AV Nilos Ring as a precision component – handle it carefully, install it correctly, and it will protect your bearing for thousands of hours.