Abstract: Small wells cut into the upper interior surface of the head plate collect oil that is sprayed forcefully upward by the rotating gears and eccentric weights and channels that oil through a throughbore across the width of the head plate, routing the oil into a hose or bored channel at each end of the throughbore, with oil in the hoses or bored channels flowing through bearing access ports into the bearings on the rotating eccentric weights. A separate oil collection well, throughbore and hose arrangement is provided for each of the eccentric weight and gear sets and may be provided for pinion gears connected to hydraulic drive motors.

Abstract: A vibratory hammer for use in driving a work piece such as a pile, pipe, caisson or plate into the earth includes a support frame 10 adapted to be suspended from a crane or the like, and a vibrator assembly 12 that is suspended from the frame. The vibrator assembly includes at least one pair of laterally spaced, parallel rotary shafts 40 that are rotatable in opposite directions to one another, and a weight 46 is supported on each shaft. Each weight is shiftable radially relative to the corresponding shaft between a balanced position in which the center of mass of the weight is collinear with the longitudinal axis of the shaft, and an eccentric position in which the center of mass of the weight is offset radially from the longitudinal axis of the shaft. Preferably, a fluid-actuated piston-and-cylinder assembly 54 is supported between each weight and the corresponding shaft for selectively carrying out the shifting movement of the weights. However, other types of shifting mechanisms could also be employed.

Abstract: In a hydraulic winch having a clutch assembly for freeing a drum of the winch for free falling rotation, a control system is provided for controlling operation of the clutch assembly. The supply system includes a directional control valve shiftable between a first position in which fluid is supplied to the clutch assembly at a first pressure which maintains the clutch in the disengaged position to allow free fall of the drum, and a second position in which fluid is supplied to the clutch assembly at a second pressure which allows the clutch to return to the engaged position, braking free fall of the drum. A timing element shifts the directional control valve to the second position after fluid has been supplied to the clutch assembly at the first pressure for a predetermined length of time.

Abstract: A hydraulic motor that provides an improved sealing configuration for sealing a shaft with respect to a housing of an internal gear motor or pump of the type commonly known as a gerotor. The hydraulic motor provides a housing having an output end and an input end with an opening extending therebetween. A gerotor is connected to the input end of the housing, and a cover is connected to and covers the gerotor while also receiving and rotatably supporting an end of the shaft. An inlet port and an outlet port are provided in the cover for communicating hydraulic fluid to and from the gerotor. A large roller bearing is coupled to the shaft and disposed within the opening of the housing to rotatably support the shaft. For high pressure applications, a pair of conventional mechanical face seals are coupled to the shaft and disposed within the opening of the housing. A third conventional lip seal may also be utilized as an added level of sealing the shaft with respect to the housing.

Abstract: A pulsation damper and noise attenuator assembly comprising a housing having an inlet port and an outlet port fluidly connecting the interior of the housing to the flow path of the fluid flow system. A base is mounted to the housing and comprises a vent fluidly connecting the interior of the housing to an external fluid source. A sealing member such as an expandable bellows or piston is seated within the housing and creates a fluid tight seal between the fluid flow path and the external fluid source sealing member. The external fluid biases the sealing member in a forward direction. The sealing member acting against the N.sub.2 fluid under pressure absorbs the full force of the hydraulic shock waves or pulsation within a high pressure fluid flow system as the assembly is mounted directly within the flow path of the fluid. The shock wave is exposed across the full face of the sealing member and dampened prior to the fluid continuing along the flow path.

Abstract: A pulsation damper and noise attenuator assembly comprising a housing having an inlet port and an outlet port fluidly connecting the interior of the housing to the flow path of the fluid flow system. A base is mounted to the housing and comprises a vent fluidly connecting the interior of the housing to the atmosphere. A piston seated within the housing creates a fluid tight seal between the fluid flow path and the vented atmospheric pressure. Belleville springs bias the piston in a forward direction. The piston absorbs the full force of the hydraulic shock waves or pulsation within a high pressure fluid flow system as the assembly is mounted directly within the flow path of the fluid. The shock wave is exposed across the full face of the piston and dampened prior to the fluid continuing along the flow path.

Abstract: A pulsation damper and noise attenuator assembly comprising a housing having an inlet port and an outlet port fluidly connecting the interior of the housing to the flow path of the fluid flow system. A base is mounted to the housing and comprises a vent fluidly connecting the interior of the housing to an external fluid source. A sealing member such as an expandable bellows or piston is seated within the housing and creates a fluid tight seal between the fluid flow path and the external fluid source sealing member. The external fluid biases the sealing member in a forward direction. The sealing member acting against the N.sub.2 fluid under pressure absorbs the full force of the hydraulic shock waves or pulsation within a high pressure fluid flow system as the assembly is mounted directly within the flow path of the fluid. The shock wave is exposed across the full face of the sealing member and dampened prior to the fluid continuing along the flow path.