SL20 Kr 30 Track Roller Cam Follower Bearings

Description of KRVE 30 Track Roller Cam Follower KRVE series Needle Bearing

Product Overview

SL20 Kr 30 Track Roller Cam Follower Bearings are specialized rolling bearings designed for linear motion applications where a rotating element follows a cam or track. With an outer diameter of 30mm, stud diameter of 20mm, and overall length of 52mm, these cam followers provide reliable performance in automated machinery, conveyor systems, and positioning equipment. The bearings feature a thick-walled outer ring that functions as both raceway and rolling surface, eliminating the need for a separate track in many applications. This robust construction allows them to handle high radial loads while maintaining precise motion control, making them indispensable in industrial automation, packaging, and material handling systems where accuracy and durability are critical.

Product Features

Structural Design

The bearings feature a stud-type construction with a precision-ground outer ring that serves as the rolling surface, eliminating the need for a separate cam or track in simple applications. The outer ring rotates around a fixed stud, incorporating a full complement of cylindrical rollers for maximum load capacity. A double-lip rubber seal (2RS) on both sides provides effective protection against dust, debris, and moisture ingress, extending service life in harsh environments. The stud features a threaded end (M20 × 1.5) for secure mounting in various equipment configurations.

Material & Performance

Manufactured from high-carbon chromium steel (GCr15), both the outer ring and rollers undergo heat treatment to achieve a surface hardness of HRC 60-64 for exceptional wear resistance. The stud is made from high-strength alloy steel (42CrMo) with a tensile strength of ≥ 1000 MPa, ensuring secure mounting under heavy loads. These materials enable the bearing to handle dynamic radial loads up to 25 kN and static radial loads up to 62 kN—impressive capacities for its compact size.

Precision & Operation

Produced to ISO 3096 standards, these cam followers maintain tight dimensional tolerances for consistent performance across multiple installations. The outer ring runout is controlled to ≤ 0.01mm, ensuring smooth operation and precise tracking. The bearings operate effectively at speeds up to 3,000 rpm with minimal vibration (≤ 55dB), making them suitable for noise-sensitive applications. They accommodate slight misalignment (up to 0.5mm parallel offset) without significant performance degradation.

Applications

Industrial Automation

In robotic pick-and-place systems, these cam followers guide the end-effectors along linear tracks, providing smooth motion with precise positioning accuracy (±0.02mm). They are commonly used in automated assembly lines to follow cam profiles that control the sequence of operations, withstanding the repetitive motion cycles (up to 10 million cycles) typical in mass production environments.

Packaging Machinery

In form-fill-seal machines, the SL20 Kr 30 bearings guide film through forming stations, maintaining consistent tension and alignment critical for proper sealing. They handle the variable loads encountered as packaging material advances through the machine, with the 2RS seals protecting against contamination from packaging adhesives and food products. Their compact design fits within the confined spaces of packaging equipment frames.

Material Handling Systems

Used in conveyor side guides and pallet stop mechanisms, these cam followers provide reliable performance under the dusty conditions common in warehouse operations. They guide and position loads up to 500kg with minimal friction, reducing energy consumption compared to sliding guides. The threaded stud design allows for easy height adjustment to accommodate different package sizes.

Textile Machinery

In textile looms and knitting machines, these bearings follow cam profiles that control needle and shuttle movements, ensuring precise fabric formation. They withstand the constant vibration and occasional thread snags typical in textile production, with the robust outer ring resisting damage from fiber accumulation and occasional contact with machine components.

FAQ

Installation & Adjustment

What torque should be applied to the mounting nut?

Tighten the mounting nut to 45-50 N·m using a torque wrench to ensure proper seating without damaging the bearing. Use a lock washer or thread locker (Loctite 243) to prevent loosening from vibration. Avoid over-tightening, which can distort the inner ring and reduce load capacity by up to 30%.

How to achieve proper alignment with the cam or track?

Use shims to adjust parallelism between the bearing axis and the track, ensuring offset does not exceed 0.5mm over the length of the track. Check alignment with a dial indicator—maximum permissible runout between the roller and track is 0.03mm. Misalignment beyond these limits increases wear and noise while reducing bearing life.

Maintenance & Troubleshooting

What lubrication interval is recommended?

For standard operating conditions (8 hours/day, moderate dust), relubricate every 500 operating hours using lithium-based grease (NLGI 2) through the grease nipple. In dusty environments or continuous operation, reduce intervals to 250 operating hours. Clean the grease nipple before lubrication to prevent contamination.

What causes premature wear on the outer ring?

Common causes include: 1) Misalignment exceeding recommended limits; 2) Contamination from inadequate sealing; 3) Overloading beyond rated capacity; 4) Improper lubrication. Inspect the outer ring surface regularly for signs of wear—uniform wear patterns indicate proper operation, while uneven wear suggests alignment or loading issues requiring correction.