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Class 2 (2nd Engineer) MEKG 📅 Jul 2025

Exam Question

With reference to electrohydraulic steering gear systems with four rams: (16) 

(a) With the aid of a sketch, describe the working principle of hydraulic pump. 

(b) Explain the method adopted to prevent hydraulic oil leakage along the rams 

(c) Discuss the methods adopted to prevent damage to the steering gear due to jumping of rudder in heavy seas.

Reference Answer

### (a) Working Principle of Hydraulic Pump (Variable Displacement Axial Piston Type)
The hydraulic pump used in electro-hydraulic steering gear is typically a variable displacement axial piston pump (e.g., Hele-Shaw or Swash Plate type). Its function is to convert mechanical energy from an electric motor into hydraulic power, providing a controlled flow of oil to the hydraulic rams.
**Construction:**
* **Cylinder Block:** A cylindrical block with multiple parallel bores, housing the pistons. It is keyed to the drive shaft and rotates with it.

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