What are the quality requirements for floating oil seals?

A floating oil seal typically consists of a pair of wear-resistant floating seal rings and a pair of rubber rings, made of ferroalloy material, forming a floating end-face sealing ring.

1. Requirements for Floating Oil Seal Seats:

A.The contact area between the inner conical surface of the floating oil seal seat and the O-ring should be free of burrs, sharp angles, and obvious unevenness; the transition should be smooth.

B.The difference in outer diameter between the floating oil seal rings should be less than 0.5mm; proper alignment is crucial during assembly. The O-ring should not be twisted or misaligned during assembly, and no lubricating oil should be present on the contact surface between the O-ring and the ring.

C.When the outer diameter of the floating seal ring is less than 330mm, a 3mm assembly gap between the two floating seal seats is recommended; when the outer diameter of the floating seal ring is greater than or equal to 330mm, a 4mm assembly gap is recommended. After assembly, the floating oil seal should be placed in a testing machine for a dynamic sealing test; there should be no leakage during continuous operation.

2. Requirements for Floating Oil Seal Rings

3. Requirements for O-rings

• The normal operating temperature of O-rings is -60℃ to 120℃.
• The hardness at room temperature is 65±5. The minimum tensile strength at room temperature is not less than 10MPa. The minimum elongation at break at room temperature is not less than 250%.
• After a hot air aging test at 120℃ for 70 hours, the hardness change should not exceed +10.
• After a hot air aging test at 120℃ for 70 hours, the deformation rate should not exceed 35%, and the A-type compression rate should not exceed 25%.
• After being placed in an oven at 120℃ for 250 hours, there should be no breakage or cracking in any of the test areas.