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Class 2 (2nd Engineer) MEKG 📅 Mar 2024

Exam Question

With reference to electrohydraulic steering gear systems with four Rams,

(a) With the aid of a sketch describe the working principle of hydraulic pump. (8)

(b) Explain the method adopted to prevent hydraulic oil leakage along the rams (4)

(c) Discuss the methods adopted to prevent damage to the steering gear due to jumping of rudder in heavy seas. (4).

Reference Answer

### (a) Working Principle of Hydraulic Pump for Steering Gear
The hydraulic pump used in modern electrohydraulic steering gear is typically a constant-speed, variable displacement, reversible-flow axial piston pump. The swashplate design is a common and effective example.
**1. Construction:**
* **Cylinder Block:** A rotating barrel containing a number of axially oriented pistons (typically 7 or 9).

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