RU2403396C2 - Coupled rotors - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: coupled rotors are made in the form of a pair of elliptical pinions engaged in mutually perpendicular direction. Each elliptical pinion along the pitch line consists of two osculating circuits and envelope curves representing arches. Circles have radius r₁ determined by the formula:

where h - centre-to-centre distance between elliptical pinions, r - radius of osculating circles the centres of which are in the same line as the centres of circles with radius r₁, at that, r =r_b/2, where r_b - major semiaxis of elliptical pinion. Arches have radius R₁ determined by the formula:

where e=h-3r - height between arch and tangent line to two osculating circles in elliptical pinion. Minor semiaxis of elliptical pinion is r_m=r+e.

EFFECT: eliminating jamming and breaks within the whole contact range, and increase of efficiency.

1 cl, 1 dwg

Description

The invention relates to mechanical engineering, in particular to volumetric rotary machines, and can be used in compressors, pumps and internal combustion engines.

Known rotors that can be used in rotary internal combustion engines, pumps, consisting of conjugated rotors with involute working teeth and their corresponding cavities located along external circles. Moreover, the characteristics of their uniform rotation around the circle coincide with the characteristics of the rotation of the involute tooth. The shape of the working teeth and troughs is determined according to the calculation formulas, which ensures uniform rotation speed (RU 2112885, F01C 1/20, F04C 2/20, publ. 1998).

The reason that impedes the achievement of the required technical result of this pairing of rotors is the impossibility of using calculation formulas for conjugated rotors of an ellipsoidal profile.

Conjugate rotors are known, consisting of a pair of ellipsoidal gears with wavy teeth engaged in mutually perpendicular direction (US 6644947 B2, 11.11.2003, F04C 2/18).

The reason that impedes the achievement of the required technical result of the known coupling is the high manufacturing accuracy and the observance of the exact center distance between the mating rotors.

Known rotors that can be used in compressors, pumps and internal combustion engines. The mating rotors are made in the form of a pair of ellipsoidal gears engaging in a mutually perpendicular direction (RU 2295042 C2, F01C 1/18 publ. 2007).

The reason that impedes the achievement of the desired result of the known conjugation of the rotors is an increase in the height of the teeth in four zones, which leads to jamming of the mating rotors during rotation.

The task to be solved by the claimed invention is directed is the determination of structural patterns for the efficient pairing of ellipsoidal gears in the rotor coupling mechanism.

In the implementation of the invention, the task is solved by eliminating the gap in the four zones of engagement and establishing strict design dimensions of the gearing, providing a constant center distance and the location of involute teeth strictly on the dividing line when the mating pair of ellipsoidal gears engaging in a mutually perpendicular direction is rotated.

The specified technical result is achieved by the fact that in the mating rotors made in the form of a pair of ellipsoidal gears meshing in a mutually perpendicular direction, each ellipsoidal gear along the dividing line consists of two contacting circles of radius r and envelopes, which are arcs of a circle of radius R passing through the centers of these circles with the center at the intersection of the line of symmetry that passes between the two circles, forming an angle 2φ, and according to the invention each ellipse prominent gear by separating line includes an additional two circles of radius r _1, defined by the formula:

where h is the center distance between the ellipsoidal gears; and two additional envelopes of arcs of circles with a radius R ₁ defined by the formula:

where e = h-3r is the height between the arc of a circle and the tangent line to two contacting circles in an ellipsoidal gear.

The centers of additional circles with radius r ₁ are on the same dividing line, but closer to the point of contact of circles with radius r, while the previous radius of the major axis of the elliptical gear r _b = 2 · r remains constant.

The centers of the additional envelopes of arcs of circles with radius R ₁ are located in diametrically opposite directions on a line of symmetry passing through a point perpendicular to the line of connecting centers of contacting circles of radius r, while the minor axis of the ellipsoidal gear r _m = r + e remains constant.

The analysis shows that the conjugate rotors, each of which is formed of two additional enlarged circles with a radius r ₁ and two envelope arcs with increased radii of circles R ₁ , with the unchanged minor and major axes of the ellipsoidal gears, form a dividing line that eliminates gaps in four zones and precisely maintains interaxal distance and eliminates jamming at rotation.

The drawing shows a pair of elliptical gears.

The mating rotors comprise a pair of ellipsoidal gears made in the form of a pair of ellipsoidal gears meshing in a mutually perpendicular direction. Each elliptical gear has at least 14 involute teeth located evenly along the dividing line at all points without gaps. Each ellipsoidal gear along the dividing line consists of two contacting circles of radius r and envelopes, which are arcs of a circle of radius R passing through the centers of these circles with a center at the intersection of the line of symmetry that passes between the two circles, forming an angle 2φ. Each ellipsoidal gear on the dividing line consists of an additional two enlarged circles of radius r ₁ , determined by the formula:

where h is the center distance between the ellipsoidal gears.

The centers of additional circles with radius r ₁ are on the same line, but closer to the point of contact of circles with radius r, while the previous radius of the major axis of the elliptical gear r _b = 2 · r remains constant.

The envelope arcs of circles with large radii R _{1 are} determined by the formula:

where e = h-3 · r is the height between the arc of a circle and the tangent line to two contacting circles in an ellipsoidal gear.

The centers of the envelopes of arcs of circles of radius R ₁ are located in diametrically opposite directions on a line of symmetry passing perpendicularly to the point of contact of circles of radius r, while the minor axis of the ellipse gear r _m = r + e remains constant.

When the ellipsoidal gears are connected, connected in a mutually perpendicular direction along the dividing line formed by large radii of circles and arcs, jamming and gaps in the entire contact range are eliminated, and analytical dependencies allow you to accurately calculate and place involute teeth in mating rotors.

Thus, a design based on the calculation formulas for mating ellipsoidal gears converts the uneven movement of the rotors into uniform with high efficiency and allows this rotor pairing to be used in a wide range of different mechanisms.

Claims (1)

The mating rotors, made in the form of a pair of ellipsoidal gears meshing in a mutually perpendicular direction, wherein each ellipsoidal gear along the dividing line consists of two contiguous circles and envelopes representing arcs, characterized in that the circles are made with a radius r ₁ defined by the formula:

where h is the center distance between the ellipsoidal gears,
r is the radius of the contacting circles, the centers of which are on the same line as the centers of circles with a radius of r ₁ , with r = r _b / 2, where r _b is the semimajor axis of the ellipsoidal gear; the arcs are made with a radius of R ₁ determined by the formula:

where e = h-3r is the height between the arc and the tangent line to two contacting circles in an ellipsoidal gear; while the minor axis of the elliptical gear r _m = r + e.