OK, the "bolt bearing" you asked about is a very practical concept. It usually doesn't refer to a standard type of bearing, but rather to a group of bearing units that come with their own installation bolts. This design combines the bearing function and the installation function into one, significantly simplifying the design and assembly process.
The most common "bolt bearings" fall into two main categories, and their purposes and usage are significantly different.
Type 1: Cam follower bearing (roller bearing with bolted axis)
This is the type that best aligns with the intuitive notion of "bolted bearing". Essentially, it is a roller with a bolt attached.
1. Core Structure:
Outer roller: Thick-walled and sturdy, serving as the contact surface.
Internal rolling elements: Usually, they are needle rollers or balls, with strong load-bearing capacity.
Spindle (bolt shaft): The center of the bearing is a high-strength bolt with threads on one end.
2. Working Principle:
It is both a bearing (capable of rotating) and a roller. It is directly installed on the frame via its bolts, allowing the outer ring to come into contact with the track, the cam profile or the surface of the workpiece, converting sliding friction into rolling friction.
3. Typical Applications:
Cam mechanism: In automated equipment, the follower of the cam converts rotational motion into precise linear or oscillating motion.
Linear guide rail: Used to support and guide the worktable, slider, etc. to move smoothly along the track.
Guide wheel/tension wheel: Used to guide chains, belts or cables.
4. Key Points for Use:
Correct Installation: After the bolt passes through the mounting plate, tighten it with a nut. The key point is: The end of the bolt must be fixed with a wrench (hexagon head or internal hexagonal hole), and then the nut should be tightened. Do not clamp or strike the outer ring directly!
For centering: Ensure that the rollers are in good contact with the surface of the track and avoid any tilting.
Lubrication: Regularly replenish the lubricating grease through the oil nozzle.
Type 2: Bolt-type roller bearing (Y-bearing unit)
This type of bearing looks very much like a "wheel" on a truck. It is composed of an outer spherical bearing with a housing and a roller (rim).
1. Core Structure:
Bearings unit: A standard outer spherical ball bearing, usually equipped with seals and lubrication ports.
Roller: Pressed onto the outer ring of the bearing.
Screw shaft: A smooth shaft that passes through the inner ring of the bearing, and is fixed at both ends by nuts.
2. Working Principle:
The rollers roll on the ground, tracks or the surface of workpieces. The bearing unit provides rotational support and automatically compensates for installation errors through its outer spherical design.
3. Typical Applications:
Transportation equipment: The pulleys and sprockets of the conveyor belt, the supporting wheels of the sprockets, and the guiding wheels for the goods.
Lifting system: Support wheels that roll on the guide rails.
Agricultural machinery: For example, the press rollers of the harvesting machinery.
4. Key Points for Use:
Installation: Insert the bolt shaft through the installation holes on the frame and the inner ring of the bearing, and secure both ends with nuts.
Centering: By leveraging its self-centering capability, it can adapt to slight installation misalignment.
Lubrication: Regularly add lubricating grease through the oil ports on the bearings.
Summary: How to Successfully Use "Screw Bearings"
Regardless of the type you are using, the following general principles apply:
Correct selection: Based on the load (mainly radial load), speed and working environment (temperature, dust), choose the appropriate type, size and sealing grade.
Clean Installation: Before installation, clean the bolts, threaded holes and contact surfaces.
Precise tightening: Use the correct tool and tighten the nut according to the recommended tightening torque. If it is too loose, it will become loose; if it is too tight, it may damage the bearing or cause premature failure.
Ensure alignment: Ensure that the bearing rollers are properly aligned with the contact surface, avoiding edge contact and uneven loading.
Regular maintenance: Follow the recommendations of the equipment manufacturer, and regularly add the appropriate lubricating grease through the oil nozzle, and check for any abnormal noises, looseness or wear.
I hope this detailed explanation will help you understand and use "bolt bearing" correctly. If you can provide more specific model numbers or application scenarios, I can offer more targeted suggestions.
Stud Type Cam Followers
NUKR SERIES
• Available with cylindrical tire OD – suffix X
• 2 row full complement cylindrical rollers
• Metric
• Labyrinth seals included for higher temperatures
• Accepts thrust through rollers
• Available with eccentric sleeve – prefix E
For details on part numbers, descriptive suffixes and various technical references, please refer to front of this section.
For engineering or technical information contact your local sales representative or call Distributor Sales (800)523-6572.
