An actuator assembly is provided for converting rotation into linear displacement including a linear fluid dispensing tube for linear displacement. Hemispherical lugs are monolithically formed on the linear member. A primary gear includes a central bore having helix grooves formed into a surface of the central bore. The helix grooves receive the hemispherical lugs so that each helix groove mates with a respective hemispherical lug to reduce friction, so that hemispherical lugs slide smoothly within the respective helix grooves. Linear projections are formed on the exterior surface of the dispensing tube and extend longitudinally along the dispensing tube. A projecting portion has an aperture for receiving and guiding the dispensing tube through the linear displacement. Mating grooves are formed on an interior of the projecting portion for receiving and guiding the linear projections, thereby preventing the dispensing tube from rotating during travel.

Disclosed are a telescopic assembly and an occlusion mechanism. The telescopic assembly includes a rotating shaft, a telescopic piece, and a connecting piece; two spiral orbits extending in an axis direction are disposed on the circumferential side of the rotating shaft, and the spiral orbits are rotatably intersected with each other and communicate on tail ends to form a closed orbit; the telescopic piece sleeves around the rotating shaft; the connecting piece is movably connected to the telescopic piece, and the other end of the connecting piece moves in a spiral orbit groove all the time during movement; and with the rotation of the rotating shaft, the connecting piece drives the telescopic piece to do reciprocating movement along an axis so that the automatic telescopic movement of the telescopic piece is achieved. The telescopic assembly pushes a first rocking bar and a second rocking bar to achieve an occlusion action.

A reciprocating tool employs a motor gear of a drive motor to rotate a drive shaft. When the drive shaft rotates, a sliding member disposed into a ball rolling groove will move along the path of the ball rolling groove. At the same time, for the restriction of annular fixing member, the component force of the sliding member in an axial direction pushes a driven shaft to move back and forth repeatedly along the axial direction, so that a tool fixed on the driven shaft will also back and forth repeatedly in the axial direction, and thus a high efficient reciprocating tool is achieved.

A harmonic drive assembly and fluid-powered linear motors with both axial pistons are rotary piston arrangements incorporating the harmonic drive assembly are disclosed. The motors may be used in downhole drilling applications, but the drive assembly and/or motors may be used in other applications. The assembly, motors and methods use advanced harmonic drives, advanced helical drives, and combinations thereof with 1) motors with axial pistons and reciprocating linear rings to convert reciprocative axial motion to continuous rotary motion, and 2) motors with rotary pistons and reciprocating linear rings to rectify reciprocative rotary motion to continual rotary motion to improve performance over prior configurations. Axial pistons provide a robust simple solution for generating rotation; Rotational pistons provide increased torque generation as the torque generated is proportional to motor length. Since downhole drills are long, a high-torque motor can be produced using this method.

An actuator assembly is provided for converting rotation into linear displacement including a linear fluid dispensing tube for linear displacement. Hemispherical lugs are monolithically formed on the linear member. A primary gear includes a central bore having helix grooves formed into a surface of the central bore. The helix grooves receive the hemispherical lugs so that each helix groove mates with a respective hemispherical lug to reduce friction, so that hemispherical lugs slide smoothly within the respective helix grooves. Linear projections are formed on the exterior surface of the dispensing tube and extend longitudinally along the dispensing tube. A projecting portion has an aperture for receiving and guiding the dispensing tube through the linear displacement. Mating grooves are formed on an interior of the projecting portion for receiving and guiding the linear projections, thereby preventing the dispensing tube from rotating during travel.

An auto-reversing driveshaft system/method configured to traverse in alternating longitudinal directions along a common driveshaft axis is disclosed. The system utilizes right-hand-thread (RHT) and left-hand-thread (LHT) channels along a target driveshaft (TDS) to engage dual drive pins (DDP) that are mechanically linked to an axial engagement collar (AEC) mechanically coupled to a motion driver platform (MDP). The AEC may be configured as a two-piece symmetric collar (TSC) in which the DDP are individually retained. The RHT and LHT are configured to implement a selected forward traverse rate (FTR) and reverse traverse rate (RTR) respectively for the DDP and AEC along the longitudinal axis of the TDS. The FTR and RTR may vary along the longitudinal axis of the TDS. The system and method are particularly applicable to the implementation of level winders, pumps, and/or situations where variable longitudinal traversal rates along the TDS are desired.

A downhole pump drive includes a housing, a submersible electric motor and protector, the drive shaft of which is coupled to the screw of a ball screw actuator movably coupled to the housing and is coupled to a rod sealed inside the housing. Interior cavities of the housing communicate with an annular space of the borehole through an elastic shell. The drive shaft of the electric motor is connected to the ball screw actuator via a reverse reduction gear. The reverse reduction gear is switched only when the nut of the ball screw actuator (or of an additional ball screw actuator) arrives at its terminal positions, improving the drive's operational reliability. The electric motor operates in a continuous mode, increasing reliability and energy efficiency of the drive owing to the absence of repeated starting and stopping of the electric motor; consequently, a spike in current intensity upon start-up is avoided.

A harmonic drive assembly and fluid-powered linear motors with both axial pistons are rotary piston arrangements incorporating the harmonic drive assembly are disclosed. The motors may be used in downhole drilling applications, but the drive assembly and/or motors may be used in other applications. The assembly, motors and methods use advanced harmonic drives, advanced helical drives, and combinations thereof with 1) motors with axial pistons and reciprocating linear rings to convert reciprocative axial motion to continuous rotary motion, and 2) motors with rotary pistons and reciprocating linear rings to rectify reciprocative rotary motion to continual rotary motion to improve performance over prior configurations.

A linear actuator member applies a vertical force to a vessel or to a holding apparatus in which a vessel is contained. A linear to angular motion constraining member such as a cage structure having a helical track translates linearly directed force and motion applied by the linear actuator member into a combined linear and rotational motion of the vessel. The combined vertical and rotational motion of the vessel in response to the vertical force is repeatable according to a predefined agitation pattern for mixing components in the vessel.

An auto-reversing driveshaft system/method configured to traverse in alternating longitudinal directions along a common driveshaft axis is disclosed. The system utilizes right-hand-thread (RHT) and left-hand-thread (LHT) channels along a target driveshaft (TDS) to engage dual drive pins (DDP) that are mechanically linked to an axial engagement collar (AEC) mechanically coupled to a motion driver platform (MDP). The AEC may be configured as a two-piece symmetric collar (TSC) in which the DDP are individually retained. The RHT and LHT are configured to implement a selected forward traverse rate (FTR) and reverse traverse rate (RTR) respectively for the DDP and AEC along the longitudinal axis of the TDS. The FTR and RTR may vary along the longitudinal axis of the TDS. The system and method are particularly applicable to the implementation of level winders, pumps, and/or situations where variable longitudinal traversal rates along the TDS are desired.