A rotating power transmission member engaged with a segmented power transmission means is balanced to counteract vibratory torques and forces by three tuned pendulum balance weights spaced 120.degree. apart. A specific application is to a crawler vehicle with tuned pendulums in the track drive, bogey and idler wheel assemblies to balance and counteract vibratory forces and torques transmitted to the wheels by the track. The balance weights are built into each wheel assembly and are tuned to the same order as the number of teeth on the track drive wheel so that the balance weights produce counterforces and countertorques, per revolution, equal to those from the number of track segments, per revolution, causing the imbalance forces and torques. In the case of the idler and bogey wheels, the tuning order is the effective pitch circumference divided by the track pitch.
A noise attenuating impact absorbing system for noise reduction and shock absorption in track laying vehicles. A plurality of devices are mounted within the teeth of the vehicle drive sprocket. Each device includes a spring means mounted within a radial bore for coacting with a plunger to which is removably attached a threaded bolt. Resilient seal means surroundingly engage the bolt and plunger and effectively close-off the bore from ingress of abrasive recrement potentially damaging to the spring. A device also includes a rigid washer member and sleeve flange portion which partially protectively cover the seal means to guard against impact damage. A track chain with which the inventive sprocket devices are associated is equipped with a plurality of bolts which are removably attached to the track link means between adjacent pairs of track bushings. The track mounted bolts are adapted to directly engage the bolts of the sprocket teeth devices to transmit impact forces thereto. The track bolts are equipped with shim means for adjustment thereof.
A sprocket wheel assembly of a crawler vehicle which comprises a first inner tube mounted on a drive shaft, a second inner tube rotatably mounted on a final reduction gear casing and fixedly connected with the first inner tube, and an outer tube disposed so as to extend over the outer circumferences of the first and second inner tubes. A first elastic annular block unit is interposed between the first annular tube and one end section of the outer tube and a second elastic annular block unit is interposed between the second inner tube and the other end section of the outer tube. A sprocket wheel for driving a linked-together endless track is fixedly mounted to the outer tube.
A sprocket for a motorcycle in which noise due to chain-sprocket intermeshing is reduced. A pair of resilient vibration reducing members are provided, one on each side of a metal sprocket body. The circumferential edges of the vibration reducing members are either curved or tapered to maintain contact with the motorcycle drive chain over a wide range of load conditions.
A wheel (16) in a continuous track assembly (12) has a hub (18) and a rim (20) connected to the hub (18). First apparatus (29) engages a track (14) of the assembly (12) to drive an associated work vehicle (10). Second apparatus (42) mounts the rim (20) in a movable relationship to the hub (18). The first apparatus (29) in movable relationship to the rim (20) to substantially absorb and isolate noise created by engagement of the wheel (16) and track (14) to drive the vehicle (10). The rim (20) is movable relative to the hub (18) to substantially isolate impact forces exerted on the wheel (16) resulting from operation of the vehicle (10).
A snap ring substantially uniform corss section is placed within a groove in a rotor disk of a bladed rotor. Unbalance of the bladed rotor with the ring installed is determined. The snap ring is removed for grinding to correct the unbalance and reinstalled at the same location grinding on or near the rotor is thereby avoided.
