How to determine if the model and size of the skeleton oil seal match?

1、 First, understand the three key dimensions of the skeleton oil seal model

All oil seals are labeled in this order:

Inner diameter d × Outer diameter D × Height H

Unit: mm (millimeter)

Example:

TC 40×62×12

=Inner diameter 40mm, outer diameter 62mm, height 12mm

As long as these three numbers match, they are basically a match.

2、 How to determine if the size matches?

1. Inner diameter d (shaft diameter)

Measure the diameter of the shaft neck

The inner diameter of the oil seal should be slightly smaller than the shaft diameter (interference fit)

The error is generally within ± 0.1~0.3mm, which is normal

Too large: Poor sealing → Oil leakage

Too small: unable to fit in, or may strain the lips

2. Outer diameter D (mounting hole)

Measure the inner diameter of the cavity hole

The outer diameter of the oil seal should be slightly larger than the hole in order to fit tightly and not rotate

Excessive outer diameter: unable to press in

Too small outer diameter: The oil seal will rotate inside the hole → oil leakage

3. Height H

Measure the dimensions of the installation slot

The height of the oil seal should match the depth of the groove, and should not be too high or too deep

Too high: deformation of the pressure cover → oil leakage

Too low: lip cannot touch the correct position → seal failure

3、 How to determine if the model structure matches?

Common models: TC, TB, TA, SC, VC, VB

TC: Inner skeleton, double lips, with springs → Most universal, used in 90% of scenarios

TB: Inner skeleton, single lip

TA: Outer skeleton

SC: Skeleton free

VC/VB: Commonly used for outer iron shell and mechanical gearbox

Key points of judgment:

Different structures cannot be interchanged

If the original car is TC, it needs to be used instead of TB

Cannot be replaced randomly with or without springs

4、 Three sentences to determine whether the speed is suitable for matching

Size matching: Inner diameter x Outer diameter x Height are all consistent

Structure: TC to TC, TB to TB, cannot be swapped randomly

Material: Oil resistant, temperature resistant, and suitable for working conditions

Meeting these three points is the matching oil seal.

5、 Simple troubleshooting mnemonic

Axial inner diameter, hole outer diameter, groove height

The model structure should be the same, and the material and working conditions should match

If all three are correct, it matches. If one is not correct, there must be oil leakage