Normally Closed Electric Hydraulic Caliper Disc Type Brake

 

01.

How to Read the Model Number

Taking YPZ2-630Ⅱ/121-MSK1-Left as an example:

YPZ2: Series, electro-hydraulic thruster shoe disc brake

630: Applicable brake disc diameter φ630 mm (some manufacturers name by braking torque class, e.g., YPZ2-630 means approx. 630 N·m class; distinguish by manufacturer naming)

Ⅱ: Frame size (Ⅰ/Ⅱ/Ⅲ basic type; Ⅳ/Ⅴ/Ⅵ reinforced type, with interlocking equal clearance and automatic shoe alignment)

121: Matched with Ed121/6 thruster

M: Automatic lining wear compensation; S: Manual release; K1: Open limit switch; K2: Closed limit switch; K3: Wear limit switch

Left/Right type: Determine the brake installation side facing the brake disc

02.

Working Principle

Power-on release:​ The thruster motor drives the hydraulic pump → the push rod lifts → both brake arms open → the shoes separate from the disc, allowing the equipment to rotate.

Power-off/fault braking:​ The thruster loses pressure → the brake spring pulls the arms together → the two linings clamp the brake disc, stopping via friction. This is a safety type of power-failure braking.

For models with automatic compensation, the clearance is automatically compensated after lining wear, resulting in more stable braking torque and less manual gap adjustment.

3. Typical Parameter Range (varies slightly by manufacturer sample)

Reference from some manufacturers for Type Ⅰ/Ⅱ samples:

Note: Even if labeled "YPZ2-630," some manufacturers refer to a disc diameter of 630, while others mean a torque class of approx. 630 N·m. When inquiring, provide all four items: "disc diameter + thruster + frame + additional functions" to avoid shipping errors.

Maintenance Key Points

Daily inspection every 1–3 days (more frequent for high-frequency conditions): thruster oil level, oil leakage, motor insulation, hinge point flexibility, switch signals.

Linings: Replace when effective wear thickness <3mm; asbestos-free plug-in pieces can directly replace the shoe block; ensure transmission mechanism cannot accidentally rotate before replacement.

Clearance: Both sides should be equal; single-sided dragging will cause heating and uneven wear; models with equal clearance/automatic compensation require less adjustment; purely manual types require gap readjustment per manufacturer specifications.

Brake disc: Free of oil, rust, and welding scars; if cracks deeper than 0.5mm are found, repair/grind, or replace if severe.

Pin shaft/core shaft wear exceeding 5% of original diameter or ovality >0.5mm, or cracks in levers/springs require immediate replacement.

No-release troubleshooting: phase loss/low voltage (e.g., below 85% of rated), low oil level, air in system, spring adjusted too tight, hinge point jamming, thruster damage.

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