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  • November 09, 2026

ZSY & ZSYA Gear Reducer: Outline and Installation Dimensions

H1: Installation dimensions of ZSY and ZSYA reducers (160-710)

The installation dimensions, torque, and rated power of heavy-duty transmissions. The external sha

pe and installation dimensions of ZSY (solid shaft) and ZSYA (hollow shaft) three-stage hard tooth 

cylindrical gear reducers range from 160mm to 710mm in frame size.

ZSY160 to ZSY710 dimension table

H2: Understanding the Dimensional Parameters

The schematic provides exact measurements needed for foundation design, coupling selection, and shaft alignment. Here is the key to the nomenclature:

  • A, B, H: Overall length, width, and center height of the gearbox housing.

  • a: Nominal center distance.

  • d₁ / l₁ / L₁: Input shaft diameter, extension length, and overall length.

  • d₂ / l₂ / L₂: Output shaft diameter, extension length, and overall length.

  • D₃ / L₃: Hollow shaft inner diameter and length (ZSYA models).

  • m₁, m₂, m₃, n₁, n₂: Base mounting hole spacing and diameter.

H2: ZSY / ZSYA Dimension Table (Selected Frame Sizes)

Note: The table below provides representative data for common frame sizes. Dimensions are in millimeters. The standard input shaft (d₁) sizes differ based on the transmission ratio range (i ≤ 71 vs. i ≥ 80).

H2: Solid Shaft (ZSY) vs. Hollow Shaft (ZSYA)

Understanding the configuration difference is essential for ordering:

  • ZSY (Solid Shaft): Uses a standard protruding output shaft (d₂ × l₂) for coupling with driven machinery.

  • ZSYA (Hollow Shaft): Features an internal bore (D₃) allowing the machine's driven shaft to pass directly through the gearbox. This eliminates the need for a coupling, saves axial space, and ensures better concentricity. The keyway dimensions for the hollow shaft are built to standard tolerances for easy shrink-disc or keyed mounting.

H2: Why Exact Dimensions Matter

  1. Foundation Bolts: The m₁, m₂, n₁, n₂ dimensions dictate the concrete footprint or steel frame hole pattern. A mismatch will cause severe vibration.

  2. Coupling Selection: Accurate d₁ and d₂ measurements ensure the correct key and interference fit.

  3. Clearance: Overall length (A) and height (H) must be verified against the installation space, especially when installing optional cooling fans or coils.

Send us your required frame size (e.g., ZSY250 or ZSYA315), ratio, and mounting position. Our engineering team will provide the exact CAD drawing and a formal quotation within 24 hours.

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