Water/Seawater

Double-Row Full-Ball Plastic Bearing (Contamination Countermeasure)

Below is an introduction to a bearing that has been adopted for use in a conveyor system. This product was considered for use in equipment where sterilization is performed using high-temperature cleaning showers or chemical agents. In such harsh environments, components contained in tap water—such as calcium, magnesium, and silica—tend to crystallize as the water dries and easily adhere to the bearing surfaces. To facilitate the cleaning and removal of these crystallized contaminants, we proposed a full-ball design without a cage. This structure allows foreign matter to be more easily flushed out during cleaning. However, because the balls in a full-ball design are in direct contact with one another, its[…..]

Plastic Pillow Block Bearings Used in Seedling Tray Washing Machines

In seedling tray washing processes, components are used in harsh environments involving a combination of water and mud. With conventional metal pillow block bearings, the following issues were encountered: Occurrence of rust Wear of sliding surfaces Abnormal noise and frequent lubrication requirements By adopting our UKB plastic pillow block, the following improvements were achieved: Maintenance-free operation Significant reduction in wear In this application, a sleeve-less design was used due to the small shaft diameter. In muddy or dirty water environments, bearings are typically provided with grooves to allow contaminants to be discharged. For grooved plastic bushings, please refer to the following application example: ▶Pillow Block Bearings for Conveyor Rollers in[…..]

Small-Diameter Plastic Ball Bearings (φ5 / Miniature)

The photo shows an ultra-miniature bearing with dimensions of φ5×φ2×3L which was considered for use in a certain medical device project. When we initially discussed the project, we explained that due to the extremely small diameter, it would be difficult to determine whether production was feasible without first attempting it. However, after prototyping in-house, we found that it was indeed possible to manufacture. Due to the lack of space to insert a retainer, the design uses a full ball configuration. In medical equipment, not only are cleaning and sterilization essential, but there is also the possibility of blood exposure, which can lead to corrosion — making the use of metal[…..]

Plastic Bearings for Transporting Hoop Materials (Coil Materials)

This product is a specially shaped bearing with a flat groove on the outer diameter and an extended inner ring on one side. The groove shape can be custom-made to match the transported material. Can be used without collars when multiple bearings are installed in parallel. Excellent chemical resistance allows usage even in highly corrosive chemical solutions. The outer diameter section features a flat groove, enabling a custom-made design tailored to the size of thin metal sheets (hoop materials). This flat groove ensures precise guidance of the transported material, preventing scratches and damage. In addition to thin metal sheets (hoop materials), various groove shapes such as V-grooves and R-grooves can[…..]

UKB Pillow Block with Vertical Grooved Bushing (Countermeasures for Foreign Particles and Wear Debris in Underwater, Liquid, and Dry Environments)

Case Example of Vertical Grooves Processed in Bushings Used for Pillow Blocks Our pillow blocks come standard as a set of three components: the housing, bushing, and sleeve. The use of vertical grooves is beneficial for the following purposes: preventing foreign material intrusion, serving as a passage for liquids, and managing wear debris. [Foreign Material Prevention] In environments where there is a risk of foreign materials like dust intruding, such materials can enter the sliding parts, leading to rotational failure or reduced lifespan. In such environments, applying vertical grooves can help expel foreign materials, ensuring they do not obstruct rotation. [Use as a Liquid Passage] Environments involving liquids such as[…..]

Large Diameter Plastic Ball Bearings (φ200 and above)

This is an example of our large diameter bearing. The photo shows a 6838 bearing (φ240×φ190×24L). This bearing is intended for use in a project involving a generator that utilizes water flow. Given that it will be used underwater, the customer is considering plastic materials and was searching for a manufacturer of large diameter bearings. We provided this bearing in response to their request to try out a few samples for testing purposes. We manufacture bearings through machining, so we can provide bearings in uncommon specifications starting from single units. We have experience in manufacturing and delivering bearings with an outer diameter of φ270 in non-standard dimensions. Additionally, our bearings[…..]

Pillow Block Bearings for Conveyor Rollers in a Sludge Treatment Plant

Our special pillow block bearings were used for the conveyor rollers in the sludge treatment plant. Originally, there was a consideration to extend the lifespan because the previously used pillow block bearings were worn out by sludge. To prevent sludge from remaining in the sliding area, we made special holes along the outer diameter of the bushing to the inner diameter and milled spirals into the inner diameter. These holes serve to allow the sludge that accumulates in the inner diameter to flow through and help extend the lifespan by enabling a water solution. In fact, tests with this specification showed that wear was significantly reduced compared to before. As[…..]

Double-Row Plastic Bearings

These bearings are used in a thread feeding line. Initially, a plastic bearing of type 6002 was used, but it could not withstand the load and led to rotational errors. Without changing the size of φ32×φ15×9L, the specification was changed from a single row to a double row, and by adding more balls, a higher load could be accommodated. In addition, by switching to an angular contact structure internally, a certain amount of axial load was also made possible. Depending on the size, it is possible to manufacture bearings with such internal specification changes. Related Pages ・Deep-groove Ball Bearings ・Angular-contact Ball Bearings ・Water/Seawater Back to Case studies

Plastic Guide Bearings for the Cleaning and Transportation of Retort Packages

Our plastic bearings have been used in the process of cleaning and drying retort packages. Originally, metal bearings with a plastic coating were used. The production line for retort packages here uses tap water for cleaning and goes through a drying oven process. Due to the use of water, metal bearings face the problem of grease being washed out and rust formation. Furthermore, tap water contains calcium carbonate, so when passing through the drying oven after cleaning while still wet, calcium carbonate adheres inside the bearing, leading to faulty rotation. Therefore, we proposed the use of UHMWPE, which is non-sticky, and designed the shape of the bearings to be easy[…..]

Plastic Thrust Bearings in Waterbeds

Our plastic thrust bearings were used in a waterbed with a massage function. The waterbed is rotated by the force of the water jet, creating a spiral water flow that is used for the massage. The bearings are used in the nozzles. Since it is used exclusively underwater, this environment is very suitable for plastic bearings. Water acts as a substitute for lubricant and helps dissipate the heat generated by rotation. Therefore, a longer lifespan can be expected compared to use in dry environments. Related Pages ・Thrust Ball Bearings ・PPS ・Water/Seawater Back to Case studies

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