# US 11,898,560 B1 · Working members of a rotary hydraulic or pneumatic machine

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- Number: US 11,898,560 B1
- Document ID: US11898560B1
- Status: Granted
- Kind: B1
- Application number: 17/871,399
- Filed: 2022-07-22
- Published: 2024-01-25
- Granted: 2024-02-13
- Earliest claimed: 2022-07-22
- Assignees: Perfobore Inc.
- Applicants: Perfobore Inc.
- Inventors: Dmitry Fedorovich Baldenko; Fedor Dmitrievich Baldenko; Ilya Alexandrovich Lyagov; Alexander Vasilievich Lyagov; Yang Yao
- Web page: https://patentgrep.com/patent/US11898560B1

## CPC

- F04C 2/103: {one member having simultaneously a rotational movement about its own axis and an orbital movement}
- F04C 2/084: {Toothed wheels}
- F04C 18/084: {Toothed wheels}
- F04C 18/10: of internal-axis type with the outer member having more teeth or tooth equivalents, e.g. rollers, than the inner member
- F04C 2250/20: of the rotor
- F04C 2250/301: compression chamber profile defined by a mathematical expression or by parameters
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS

## Abstract

The utility model relates to internal cycloidal gear mechanisms and can be used in various branches of mechanical engineering as working members of hydraulic machines (pumps and engines), compressors, internal combustion engines, as well as in planetary gearboxes, in particular in technical systems for drilling and repairing oil and gas wells. The problems to be solved by the utility model include the improvement of the quality of the process of designing working members having a cycloidal tooth profile, as well as the substantiation of the conditions for modifying cycloidal face profiles (by choosing the required combination of dimensionless gearing coefficients) in order to achieve the maximum or minimum open area of the gerotor mechanism having a different kinematic ratio.

## Claims

### Claim 1

Working members of a rotary hydraulic or pneumatic machine manufactured in the form of a gerotor mechanism having a stator and a rotor, wherein the stator and the rotor have a cycloidal face profile, wherein a number of teeth of the stator is one more than a number of teeth of the rotor, wherein a ratio between a contour diameter (by cavities of teeth of the stator) Dκ and a gear eccentricity e (Dκ/e), which depends on a combination of dimensionless geometric coefficients (eccentricity coefficient co=r/e, tooth shape coefficient ce=rμ/e and displacement coefficient cΔ=Δx1/e) used in the formation of the cycloidal face profile by a method of running-in a cycloidal rack is assigned based on achievement of a maximum open area for a given kinematic ratio i=z2:z1 while maintaining smoothness of teeth contours and an absence of interference of conjugate profiles,
where
r—generating circle radius;
rμ—equidistant radius;
Δx1—displacement of the basic rack contour relative to the generating line;
z1, z2—number of stator and rotor teeth; and
wherein the dimensionless geometric coefficients of the cycloidal face profile are in the following ranges:
Dκ/e=6 to 24,
co=1.05 to 1.2,
ce=0to 1.75,
cΔ=−2.5 to 0.5, and
wherein lower values of the ratio Dκ/e correspond to a smaller number of teeth of the stator and of the rotor.

### Claim 2

Working members of a rotary hydraulic or pneumatic machine manufactured in the form of a gerotor mechanism having a stator and a rotor, wherein the stator and the rotor have a cycloidal face profile, wherein a number of teeth of the stator is one more than a number of teeth of the rotor, wherein a ratio between a contour diameter (by cavities of teeth of the stator) Dκ and a gear eccentricity e (Dκ/e), which depends on a combination of dimensionless geometric coefficients (eccentricity coefficient co=r/e, tooth shape coefficient ce=rμ/e and displacement coefficient cΔ=Δx1/e) used in the formation of the cycloidal face profile by a method of running-in a cycloidal rack is assigned based on achievement of a minimum open area for a given kinematic ratio i=z2:z1 while maintaining smoothness of teeth contours and an absence of interference of conjugate profiles,
where
r—generating circle radius;
rμ—equidistant radius;
Δx1—displacement of the basic rack contour relative to the generating line;
z1, z2—number of stator and rotor teeth;
wherein the ratio between the contour diameter and the sear eccentricity of the cycloidal face profile Dκ/e ranges between 15 to 30 based on the combination dimensionless geometric coefficients with the eccentricity coefficient co close to one, and
the combination of the coefficients ce and cΔ are a minimum intersection of the conjugate profiles; and wherein lower values of the ratio Dκ/e correspond to a smaller number of teeth of the stator and of the rotor.