Detailed explanation of structure and function

1. Matching method with oil seal

For skeleton oil seal:

The oil seal is installed in the oil seal hole of the end cover, and the outer diameter is pressed in the end cover;

When the shaft rotates, the inner lip of the oil seal fits on the shaft surface to achieve radial sealing.

For V-ring:

The V-ring is installed on the shaft, and the lip contacts the outer surface of the end cover to achieve axial sealing;

At this time, the end cover provides a static and smooth sealing contact surface.

2. Additional functions (depending on the structure)

Dustproof retaining ring function

Provide lubricating oil return groove

Support bearing seat (in the end cover structure with bearing)

Precautions for end cover design (when matching with oil seal)

The contact surface should be smooth and scratch-free (Ra ≤ 0.8 μm);

There should be no sharp angles or steps in the lip contact area;

An appropriate oil seal preload clearance should be left;

For high-speed equipment, the end cover needs to be dynamically balanced;

Consider oil drain holes or oil return grooves to prevent oil seal back pressure failure.

? Typical application diagram (simplified)

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┌────────────┐ ← End cover (with oil seal)

Bearing chamber ─┤ Oil seal lip ├───→ Shaft (rotating)

└────────────┘

↑

Stationary contact surface (inner surface of oil seal end cover)

? Common supporting parts

Skeleton oil seal (TC, SC type, etc.)

V-ring (VA, VS type)

Oil seal seat, gland ring, oil retaining ring

Grease or lubricating oil

✅ Application examples

Motor front and rear end covers (including oil seal)

Gearbox output shaft cover

Agricultural machinery, wind power equipment shaft end seal

Water pump shaft end seal system