高温深沟球轴承系列

An extreme alternative: the SKF self-sacrificing- cage

2Z/VA228 shielded ball bearings are an excellent dry lubricant alternative for applications where speeds are below 200 r/min and

temperatures range from –45 to +350 °C. These unique bearings are fitted with a coronet cage made of graphite. During operation, the cage releases minute amounts of graphite powder that lubricate the bearing.

The shields on these bearings protect against the ingress of contaminants and guide the cage axially. To further protect the

bearing from corrosion and enhance running properties, all bearing surfaces are coated with manganese phosphate. Even at the upper temperature limits, the graphite cage will not release dangerous vapours.

The cost-effective solution

The 2Z/VA208 like the 2Z/VA228 (above), is a shielded ball bearing with a graphite cage. However, instead of a coronet cage, the 2Z/VA208 has a segmented graphite cage to separate the balls and provide the necessary lubricant. These cost--effective bearings are designed for applications where speeds do not exceed 100 r/min.

Non-dry solutions for demanding applications

Every extreme temperature application has its own unique challenges. As a result, SKF has developed special variants of ball bearings that have been adapted to deliver excellent performance, based on the operating conditions of the application.

VA201 extends bearing service life

SKF extreme temperature open design ball bearings with a VA201 suffix can significantly extend bearing service life. Packed with a polyalkylene glycol/ graphite mixture, these bearings can be used in applications where speeds do not exceed 250 r/min and temperatures range from –40 to +250 °C. To further

protect the bearing from corrosion and enhance running proper-ties, all bearing surfaces are coated with manganese phosphate, which also enhances adhesion of the lubricant to the metal.

The VA201 is also available with

shields (designation suffix

2Z/A201).