Working principle of hydraulic steering gear
working principle:
1. In the middle position (when the steering wheel does not rotate). The oil from the oil pump returns to the oil tank through the inside of the steering gear.
2. During power steering, the oil from the oil pump enters the cycloidal pin wheel engagement pair (metering motor) through the servo valve, and the rotor is driven to rotate along with the steering wheel. Depending on the size, orientation, and quantitative direction of the steering wheel steering angle, hydraulic pressure is injected into the left or right cavity of the oil cylinder, pushing the guide wheel to achieve power steering. The oil on the other side of the cylinder returns to the tank through the servo valve.
3. Manual steering: When the engine shuts down, the steering wheel is operated manually, and the rotor of the metering motor is driven to rotate through the valve core, shift pin, and linkage shaft in the steering gear. The metering motor injects hydraulic pressure into the oil cylinder, pushing the guide wheel to achieve manual steering.
The volume difference between the two chambers of the oil cylinder can be replenished by the oil tank through the oil return port. As the steering gear is used for heavy vehicles with low speeds, in order to prevent steering wheel tampering, the structural type is designed to be an open center, unresponsive structure. The external force acting on the guide wheel cannot be transmitted to the steering wheel, and the driver has no road feeling.
