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| Illustration 1 | g01420127 |
Right Side of Drum (1) Speed sensor (2) Case drain line (3) Vibratory motor | |
Vibratory motor (3) is mounted on the right side of the drum. The vibratory motor is a piston type motor with a fixed displacement. This motor turns the eccentric weight drive shaft when the vibratory system is operating.
Rubber isolation mounts dampen the vibration which is transmitted from the drum to the machine when the vibratory system is operating.
The vibratory motor contains an integral flushing valve. This valve operates in the same manner as the flushing valves on the propel motors. One difference is that the flushing relief valve is set to open when the pressure in the low pressure side of the loop is above a pressure of 1600 kPa (232 psi). Case drain line (2) directs oil to the return manifold.
Speed sensor (1) is mounted to the vibratory support. The sensor is located to the rear of the vibrator motor. The speed sensor is a frequency type device. A gear on the output shaft of the vibratory motor rotates past the tip of the speed sensor. Every time a tooth passes the sensor, an electrical impulse is sent to contact "3" of the vibratory tachometer.
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| Illustration 2 | g01420132 |
Vibratory Motor With Flushing Valve (Cross Section) (1) Output shaft (2) Output shaft flange (3) Piston (4) Valve plate (5) Flushing spool (6) Flushing relief valve (7) Barrel assembly | |
The vibratory motor is a bent axis motor with a fixed displacement. The motor is equipped with a loop flushing valve.
When the vibratory system is operating, supply oil from the vibratory pump enters the motor. Supply oil is directed to the inlet port of the valve plate. Supply oil is also directed to the flushing spool. The valve plate directs oil into the piston chamber in the barrel assembly. This pressure forces the pistons which are aligned with the inlet port to move out of the barrel assembly.
As the pistons are forced out of the barrel assembly, the pistons exert a thrust against the output shaft flange. This thrust causes the output shaft to rotate. The barrel assembly and pistons rotate with the output shaft.
As the barrel assembly rotates, pistons align with the outlet port in the valve plate. The rotation of the barrel assembly forces oil out of the piston chambers and into the low pressure side of the hydrostatic loop. The low pressure oil acts on the flushing spool. Then, the oil returns to the inlet side of the hydraulic pump.
High pressure oil acts against one side of the flushing spool. Low pressure oil acts against the other side of the flushing spool. The force from the high pressure oil causes the flushing spool to shift. The shift opens a passage for oil in the low pressure circuit in order to act against the flushing relief valve.
The flushing relief valve opens at 1600 kPa (232 psi). This pressure is lower than the setting of the charge relief valve. Therefore, during normal operating conditions the flushing relief valve opens when the vibratory system is operating. This causes oil to be flushed from the hydrostatic circuit. An orifice in the motor controls the flow rate. The oil is flushed through the motor case.
Note: The orifice that is in the motor only allows a small amount of oil from the low pressure loop to flow into the motor case. This is compared to the total amount of charge flow that is available. Therefore, even though the flushing relief valve opens at 1600 kPa (232 psi), because of the orifice, charge pressure only drops slightly when the vibratory system is operating.