1399925 ENGINE AR-COMPLETE Caterpillar parts C-12 ENGINE
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TRUCK ENGINE C-12 Caterpillar
Illustration 1 g03817493
Inside Front Drum (1) Eccentric weight housing (2) CAAC cylinder (3) Vibratory motorEach drum contains two eccentric weights. The weights are located in eccentric weight housing (1) inside the drum. The eccentric weight housing is sealed and lubricated. The eccentric weights are connected to the output shaft of vibratory motor (3). When the vibratory system is operating, the output shaft from the vibratory motor rotates the two weights. Since the center of gravity of the eccentric weights is not at the center of the motor output shaft, the eccentric weights form an imbalance. This imbalance causes the drum to vibrate when the weights are rotating.CAAC cylinder (2) controls the relative position of the eccentric weights in order to control the vibratory amplitude of the drum.
Illustration 2 g03817490
Cross Section of Eccentric Weight Housing (1) Eccentric weight shaft (4) Phasing shaft (5) Outer eccentric weight (6) Inner eccentric weight (7) Maximum amplitude (8) CAAC cylinder coupler (9) Minimum amplitude (10) Helical threads (11) Splines (12) Input from motorThe rod end of CAAC cylinder (2) is connected to CAAC cylinder coupler (8). The coupler is connected to phasing shaft (4). Helical threads (10) are cut into one end of the phasing shaft, and splines (11) are cut into the other end of the shaft. The helical threads of the phasing shaft mesh with helical threads that are cut into outer eccentric weight (5). The splines of the phasing shaft mesh with splines that are cut into inner eccentric weight (6). Input from vibratory motor (12) rotates outer eccentric weight (5). This rotation also drives inner eccentric weight (6) through phasing shaft (4). The eccentric weights rotate at the same speed.Rotation of the eccentric weights places the shaft bearings under a high load. This load creates the need for constant lubrication. The bearings are splash lubricated with oil inside eccentric weight housing (1). As CAAC cylinder (2) extends and/or retracts, inner eccentric weight (6) rotates relative to outer eccentric weight (5). Helical threads (10) and splines (11) allow this rotation. When the heavy side of the inner eccentric weight is aligned with the heavy side of the outer eccentric weight, the vibratory amplitude is at maximum. Maximum amplitude (7) configuration of the weights is shown in the above illustration. When the heavy sides of the outer and the inner eccentric weights are offset 180 degrees, the vibratory amplitude is at minimum. Minimum amplitude (9) configuration of the weights is also shown in the above illustration.