YWZ4-400/90 = electro-hydraulic shoe/drum brake, 400 mm drum, matched with YT1-90Z/8 thruster, rated brake torque 1600 N·m.
1. Model meaning
YWZ4 = electro-hydraulic drum brake, replacement of old YWZB / YWZ4B
400 = brake wheel / drum diameter = Ø400 mm
90 = thruster thrust class → YT1-90Z/8
No "E" in model → fitted with YT1 thruster (if "YWZ4-400/E80" it would be Ed thruster)
2. YWZ4-400/90 main parameters
|
Item |
Value |
|---|---|
|
Brake type |
Electro-hydraulic drum / shoe brake, normally closed |
|
Drum diameter |
400 mm |
|
Matched thruster |
YT1-90Z/8 |
|
Rated braking torque |
1600 N·m |
|
Weight (brake only) |
≈ 130 kg |
|
Ambient temp. |
−20 °C … +40 °C (some makers +50 °C) |
|
Relative humidity |
≤ 90% RH |
|
Supply |
3-phase AC 380 V 50 Hz (other voltages on request) |
|
Duty |
S1 / S3-60% |
|
Lining |
asbestos-free, snap-in type |
|
Features |
equal-gap mechanism, self-lubricating pivots, spring-applied / thruster-released |
3. Key dimensions (typical, mm)
A = 595, b = 180, C = 220, D = 400, d = 22, E = 370, F = 180, G1 = 350, G2 = 350, H = 750, h1 = 320, i = 130, K = 325, M = 275, n = 12, G3 = 190
4. YT1-90Z/8 thruster
Thrust class: 90 (≈ 900 N thrust depending on maker)
Stroke code: /8
Function: when energized, pushes brake arms open; when de-energized, spring closes the shoes on the drum
Mounting: vertical installation for YT1 version (Ed thrusters allow more mounting angles)
5. Operating principle
Power off → spring force closes brake shoes → braking
Power on → YT1 electro-hydraulic thruster extends → opens brake arms → machine can run
