CB10 Vibratory Asphalt Compactor Machine Systems Piston Motor (Vibratory) Caterpillar


Piston Motor (Vibratory)
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Illustration 1g06609833
Right Side of Rear Drum
(1) Port "A"
(2) Vibratory motor (rear)
(3) Port "B"
(4) Port "T2"
(5) Flushing spool
(6) Port "T1"
(7) Rear vibratory speed sensor

Rear vibratory motor (2) is on the right side of the rear drum. This motor is an axial piston motor with a bent axis. The front vibratory motor is identical to the rear vibratory motor. The front vibratory motor is on the left side of the front drum.

Rubber isolation mounts dampen the vibration which is transmitted from the drum to the machine when the vibratory system is operating.

Vibratory speed sensor (7) is at rear vibratory motor (2) and at the front vibratory motor. The vibratory speed sensors provide the input signals to the machine ECM. The machine ECM uses the input signals from these sensors in the vibratory control logic. This input is also used to populate the vibratory speed value on the operator display.

Each port in the motor housing is identified by a letter or an alpha-numeric designation. The function of each port is as follows:

  • Port "A" (1) is a system port. When oil is directed into port "A", the motor turns clockwise, as viewed from the output shaft end of the motor. Clockwise motor rotation produces divergent rotation of the eccentric weights. This rotation results in high-amplitude operation.

  • Port "B" (3) is a system port. When oil is directed into port "B", the motor turns counterclockwise, as viewed from the output shaft end of the motor. Counterclockwise motor rotation produces convergent rotation of the eccentric weight. This rotation results in low amplitude operation.

  • Port "T1" (6) is one of two case drain ports on the motor. Port "T1" is plugged.

  • Port "T2" (4) is one of two case drain ports on the motor. Port "T2" of the motor is connected to the bypass manifold.

Vibratory motor (2) contains an integral flushing valve. The flushing valve consists of flushing spool (5) and the flushing orifice (not shown). The flushing orifice is inside the motor end cap.



Illustration 2g06609845
Motor Cross Section
(5) Flushing spool
(8) Output shaft flange
(9) Piston
(10) Valve plate
(11) Flushing orifice
(12) Output shaft
(13) Barrel assembly
(14) Centering springs

When the vibratory system is operating, supply oil from the vibratory pump enters the motor. This oil acts against flushing spool (5) and is directed to valve plate (10). The valve plate directs oil into the piston chamber in barrel assembly (13). This pressure forces pistons (9) that are aligned with the inlet port to move out of the barrel assembly.

As pistons (9) are forced out of barrel assembly (13), the pistons exert a thrust against output shaft flange (8). This thrust causes output shaft (12) to rotate. The barrel assembly and pistons rotate with the output shaft.

As barrel assembly (13) rotates, pistons (9) align with the outlet port in valve plate (10). 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 flushing spool (5) and then returns to the inlet side of the hydraulic pump.

Oil in the high-pressure circuit causes flushing spool (5) to shift. The flushing spool directs oil from the low-pressure side of the hydrostatic loop to flushing orifice (11). The flushing orifice diverts oil from the low-pressure side of the propel loop into the motor case.

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