SGO Korea Newsletter Jun' 2023 : What is SDU Bearing? (1)🔍

2023. 6. 28.

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All About SGO Bearings🔍

- What is SDU Bearing? (1) -

SDU Dry Bearings

Today's letter is about SDU dry bearings.

SDU bearings are made of low-carbon steel with PTFE resin bonded to them. They are characterized by excellent friction properties operating without lubrication. While SDU bearings are suitable for fields that require small sizes and lightweight components, their use is limited in applications that demand hardness in the bearing layer.

Structure

The SDU is a composite bearing with a steel backing, porous bronze, and PTFE.

Structure

①Plating (Tin/Copper thickness of 0.005mm or more): Plating provides excellent corrosion resistance.

②Polytetrafluoroethylene(PTFE 0.01~0.03mm): A non-combustible fluororesin that is resistant to heat and has excellent chemical resistance with very low coefficient of friction. It effectively coats the binding surface of the relative material and forms an initial solid lubrication film.

③Porous bronze (0.20~0.3mm): Porous bronze with PTFE impregnation provides a strong bond with the steel backing, ensuring minimal temperature increase on the bearing surface and offering dimensional stability.

④Steel backing (low-carbon steel 0.7~2.3mm): Steel backing provides mechanical strength and thermal conductivity, allowing for thin and compact design possibilities.

Characteristics

It can be used both without lubrication and with lubrication and is suitable for areas requiring compact and lightweight.
It features an excellent friction coefficient and wear resistance under high load and low-speed usage conditions.
A wide usable temperature range and excellent chemical resistance.
It is possible to use the counter material (shaft) without heat treatment, so there is no cost burden for the counter material.
It does not absorb water/oil and has excellent thermal conductivity, making it excellent dimensional stability.

SDU, which is characterized by low friction, goes through a total of three friction phases.

①Running-in phase: After the running-in phase, PTFE (bearing) rubs against PTFE (shaft), so the friction coefficient and wear amount decrease and enter the stabilization stage.

②Stabilization phase: After the running-in phase, PTFE (bearing) rubs against PTFE (shaft), so the friction coefficient and wear amount decrease and enter the stabilization stage.

③Sharp abrasion phase: As PTFE is gradually consumed, sufficient lubricant is not supplied to the operating surface, and the friction coefficient and abrasion rate rise rapidly. When approximately 70% of the porous bronze layer is exposed, the SDU bearing is considered to have reached the end of its service life.

Go to See More Products

Thank you for your visit at CSPI-EXPO 2023!

SGO participated in the 5th Construction & Survey Productivity Improvement EXPO 2023, the largest specialized exhibition in the construction and surveying industry, from May 24 to May 26 in Japan.

At the exhibition, SGO showcased a wide range of bearings, including bronze bearings with graphite plugs, hardened steel bearings, bi-metal bearings, dry bearings, and a newly developed sintered bearing.

Many visitors inquired about bronze bearings with graphite plugs as the alternative to hardened steel bushings, which are used the most in this industry and require periodic lubrication for maintenance.
Self-lubricated bronze bearings are maintenance-free and resistant to extreme shock because of high elongation, though they have a lower hardness than hardened steel bushings.

We learned the industry trends and customer needs from the show and will do our best to be your partner to solve a problem and find a solution together.

We thank you a lot for your visit and will you at M-TECH Osaka from Oct 04 to Oct 06.

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