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| Illustration 1 | g00461787 |
Vibratory Motor Components (1) End Cap. (2) Port plate. (3) Cylinder block. (4) Piston. (5) Shaft. (6) Flushing shuttle spool. (7) Shim. (8) Flushing relief valve. (9) Fixed swashplate. (10) Housing. | |
The vibratory motor is a fixed displacement hydraulic motor. Oil flows to the motor and from the motor through hoses attached to the end cap (1) .
High pressure oil from the pump enters the motor through the end cap (1). The oil will pass through the port plate (2) and the oil will act on the piston (4). Piston (4) is one of seven pistons in the assembly of the cylinder block (3) .
As the pistons react to the high pressure oil, the cylinder block (3) and the pistons (4) rotate as an assembly. The cylinder block (3) is splined to the shaft (5). Rotating torque is transferred to the shaft (5). The displacement of the motor is controlled by the angle of the fixed swashplate (9). The nonadjustable swashplate angle is machined into the motor housing (10) .
Case Flushing
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| Illustration 2 | g00462119 |
Hydraulic Schematic For The Motor (8) Flushing relief valve. (10) Motor housing. (11) Flushing shuttle valve. (12) Line (drain to return manifold). (13) Pilot passages. (14) Loop lines. | |
Lubrication for the internal moving parts is done with the normal internal leakage oil. The case flushing and the cooling of the pump and the motor is accomplished by the flushing circuit.
The flushing circuit oil is supplied by the charge circuit. The flushing of the vibratory pump is continuous. Case flushing of the motor occurs during the pump stroke.
Oil enters the motor and oil exits the motor (10) through the loop lines (14). The pilot oil from the loop lines (14) flows to both ends of the shuttle spool (6). The flow is through the pilot oil passages (13). The high pressure side of the circuit shifts the shuttle spool (6). The shift of the shuttle spool allows the low pressure oil of the loop lines (14) to flow through the flushing relief valve (8). The oil flushes the motor housing (10) and flows to the return manifold through line (12). The thermal bypass valve directs the oil through the oil cooler or to the hydraulic tank. The temperature of the oil will determine the direction of the oil.
The charge pump supplies approximately 20 L/min (5.3 US gpm). The charge pump replenishes normal leakage oil. The remaining charge oil will dump in one of two places:
- The relief valve
- Flow through the flushing valve
In order to flush the motor housing, the flow rate of the oil in the flushing relief valve (8) must be 4.9 L/min (1.3 US gpm).