1. Generation of turnover
The high-pressure oil supplied from the hydraulic pump flows into the cylinder and valve plate through the motor valve shell. High pressure oil is formed when the oil flows through the Y---Y oil passage---terminal connected to the upper and lower ends of the plunger. High-pressure oil produces pressure (F1 = PXA, "P refers to the pressure, A refers to the pressure area), and acts on the plunger.
In the case of a rotational swash plate of the tilt angle A, F is divided into topical push pressure N and a partial radial pressure W. w Generate torque, T = W: XR, because the Y-Ye oil passes through the piston up and lower end connections.
A high-voltage one-end is generated from each plunger (4 ~ 5) to generate a rotational force. Torque conversion into a rotational force through the plunger to the cylinder, as the cylinder includes a rotary shaft and a spline, and the rotation force is rotated.
2. Overflow valve work
The overflow valve exercises the following two functions.
1 When the hydraulic motor is driven, the relief valve makes the pressure standard, such as the additional oil passage by the inertial acceleration.
2 When the inertia is stopped, the relief valve is stopped in accordance with the brake pressure destination of the predetermined end.
Chamber A is always connected to the oil port A of the motor. If the oil port pressure increases, the pressure is pushed the bracket A.
If the pressure is large, the bracket A is separated from the connecting surface of the seat A, so the oil flows in the chamber A.
3. Brake work
Modern excavator brakes acts on the pressure in the valve cassette to the brake plunger and release the brake.
When the pressure does not work, the brake is still running.
The friction between the plates fixed to the shaft housing produces a braking force, the brake plunger and the friction plate are connected by the spline of the outer end of the cylinder.
When the pressure does not act on the plunger component, the brake spring presses the brake plunger, the oil of the brake chamber flows through the leak opening of the motor. At this time, the brake plunger extruded the friction plate, the separation plate and the brake plunger in the middle of the shaft housing according to the pressure of 10 brake springs, and finally generate friction.
The friction helps the brake to secure the rotating shaft of the cylinder and the operational spline.
4. Balanced valve
AV is a hydrogenetic pump, and BV is a fuel tank.
The hydraulic pump of hydraulic pump is in a single-way valve AV oil port → CV oil port, and is supplied to the hydraulic motor through the oil port L. However, the oil pressure outside the pump is increased and transmitted to the spring chamber M through the channel G because the brake is working.
If the pressure of the chamber M is greater than the spring force to keep the springs in the spool, the spool is moved to the right.
The oil of the chamber N is sent to the chamber M by the hole I, and flows through the channel G to the fuel tank. Therefore, the valve core is moved to the right, and the oil flow of the K oil port → BV oil port is also the same.
5. Automatic switch (normal speed)
Because there is no pilot control pressure, the spool does not work.
6. Automatic switch (high speed)
At normal speed, if the hydraulic oil flows into the high-speed switching pressure port (external pilot control pressure P = 35kgf / cm?) Through the inner passage of the spool, the spool is moved from the right to the left.
At high speed, the rotary pressure of the motor Di exceeds 250 kgf / cm ', when the power force forces the pressure of the valve core 1 (pressure P1) is greater than the spool 2, the spool 1 is introduced, and then the spool 2 moves from the left to the right, Switch work.
