Fluid-powered linear motor with rotary pistons and motion rectifier
| DWPI Title: Fluid-powered linear motor module for e.g. oil drilling application, has harmonic drive reciprocating ring coupled to harmonic drive rotor such that reciprocating ring rotates drive screw to impart continuous rotary motion to motor assembly |
| Abstract: A fluid-powered linear motor with rotary pistons is disclosed. An application is for a downhole motor but it could be used in other applications. Rotational pistons provide increased torque generation as the torque generated is proportional to motor length. Since downhole drills are long (generally up to a maximum length of 30 ft.), a high-torque motor can be produced using this method. A pressurized fluid is used to drive the piston assemblies to produce bit shaft power. This concept employs rotary pistons and a mechanical rectifier to convert the rotational reciprocation produced by a reciprocating rotational piston into continuous rotary motion. |
| Use: Fluid-powered linear motor module for deep earth penetration applications e.g. oil drilling and geothermal drilling applications. |
| Advantage: The module has allows drilling fluid to flow through a power section to immune to particulates settling on piston lands. The module prescribes preferential torque and speed characteristics by specification of design parameters governing operation of the rotary piston/helical drive screw/harmonic drive combination comprising the assembly. |
| Novelty: The module has a primary rotor assembly (20) comprising a harmonic drive rotor. A secondary reciprocating rotor assembly (30) is coupled to the primary rotor assembly, and comprises a reciprocating rotary piston assembly and a helical drive screw. A helical drive reciprocating ring (40) is coupled to the helical drive screw. A harmonic drive reciprocating ring (50) is coupled to the helical drive reciprocating ring and the harmonic drive rotor such that reciprocating motion of the secondary reciprocating rotor assembly imparts linear motion to the helical and harmonic reciprocating rings and the harmonic reciprocating ring rotates the helical drive screw to impart continuous rotary motion to the primary motor assembly. |
| Filed: 10/5/2018 |
| Application Number: US16153265A |
| Tech ID: SD 14303.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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