| 摘要 |
A pressure relief device for a gear box which is disposed in the gear box and comprises a body, a blocking member and a spring. The body is defined with a penetrating hole. The spring pushes the blocking member and makes it seal the penetrating hole. When the pressure rises since the temperature therein is risen, and when the gas pressure in the gear box is larger than the force of the spring, the gas can push the blocking member and compress the spring, and then discharge from the penetrating hole of the body, thus reducing the pressure and the temperature of the gear box.
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