Westinghouse Gear Drive Sliding Pinion / Sliding Engagement Assembly

Westinghouse Sliding Assembly – Typical Specifications

Function

• Provides mechanical engagement and disengagement between a low-speed auxiliary drive (jacking/turning motor) and the main driven shaft.

• Allows slow rotation of heavy equipment during:

  • Start-up

  • Shutdown

  • Cool-down / warm-up

  • Maintenance and inspection

Assembly Type

• Sliding Pinion / Sliding Gear Engagement Assembly

• Axially movable gear mounted on a splined shaft

• Engages a bull gear, ring gear, or coupling hub gear

Mechanical Design

• Gear Type: Helical or double-helical (herringbone on heavier units)

• Engagement Method:

  • Manual lever, or

  • Power-assisted (electric or pneumatic actuator depending on build)

• Shaft Interface: Involute spline (axial sliding, torsional lock)

• Bearing Support: Heavy-duty roller or sleeve bearings in gear housing

Operating Speed

• Input Speed (jacking motor side): typically 1,500–1,800 RPM

• Output Speed (turned shaft): approximately 0.05 – 0.3 RPM

• Designed for continuous slow roll without overheating