RU2372537C2 - Resilient annular member of coupling boxes of rotating shafts - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: coupling consists of two half couplings, installed and fixed immobile at ends of connected shafts, two packs of resilient annular members, fixed to half couplings, and sleeve adapter. Flanges of sleeve adapter are fixed to packages of resilient annular members. Coupling is outfitted also by intermediate ring. Resilient annular member contains holes and openings in the form of concave arc on external diametres. Correlation of external diametre of resilient member and diametres of circles pitches location in resilient member corresponds expression: d_n/d_r=1.15-1.35, where d_n - external diametre of resilient member; d_r - diametres of circles pitches location in resilient member, herewith relation of location diametre of bottom points of openings in the form of concave arc to diametres of circles pitches location in resilient member corresponds expression: d_z/d_r=1.0-2, where d_z - disposition diametre of bottom points of openings in the form of concave arc; at d_z=d_n-2 δ, where δ - depth of opening in the form of concave arc relative to external diametre of resilient member.

EFFECT: increasing of compensating properties, reduction of rigidity and decreasing of mass-dimentional parametres of coupling.

4 cl, 5 dwg

Description

The present invention relates to mechanical engineering, in particular to elastic annular elements of couplings for connecting rotating shafts of engines and working machines.

Known elastic ring element used in the coupling containing two coupling halves, two packages of these elastic ring elements with holes for fastening elements of the packages to the coupling halves, fastening elements and an intermediate sleeve attached to the packages of elastic ring elements. [GOST 26 455-85. Coupling reference. Ed. V.S. Polyakova. L .: Engineering, 1979, p.33].

The disadvantage of this design is the increased stiffness of the elastic elements, limited compensating properties and overestimated weight and size parameters of the couplings in which they are used, due to the fact that not all sections of the elastic elements are equally loaded during operation.

Closest to the claimed invention is an elastic ring element, the design of which differs from the above, in particular, providing the possibility of transition to the strip element of the coupling without changing its characteristics, as well as creating the prerequisites for reducing the mass of the coupling, due to cutouts in the form of a concave arc on the outer diameter of the element [Patent UA No. 49964, F16D 3/78, F16C 33/04, published: 10/15/2002 Bull. No. 10, 2002].

However, the design of the prototype does not provide a uniform distribution of stresses in the elastic element due to the need to create conditions for the transition to the strip element, according to which it was assumed that the symmetry of the elastic element relative to the segment connecting the two adjacent holes, and the equality of the radius of the cuts in the form of concave arcs to the inner radius elastic element. This form of the elastic element is not always optimal from the point of view of the magnitude and nature of the stress distribution arising in it during the operation of the coupling, which results in non-optimal (increased) stiffness and mass of the coupling and the deterioration of its compensating properties.

The basis of the invention is the task of creating a design of such an elastic ring element, which would improve the compensating properties, reduce stiffness and reduce the overall dimensions of the coupling, while maintaining its load capacity by optimizing the shape of the elastic element, providing the most uniform distribution of stresses from external force factors in the elastic element and, ultimately, to increase the reliability of the coupling and the connected equipment.

The problem is solved in that in the elastic ring element of the coupling of the rotating shafts with holes and cuts in the form of a concave arc on the outer diameters, according to the invention, the ratio of the outer diameter of the elastic element and the diameters of the centers of the holes in the elastic element corresponds to the expression:

d _n / d _r = 1.15-1.35,

where d _n is the outer diameter of the elastic element;

d _r is the diameter of the location of the centers of the holes in the elastic element, the ratio of the diameter of the lower points of the cuts in the form of a concave arc to the diameter of the location of the centers of the holes in the elastic element corresponds to the expression:

d _z / d _r = 1.0-2.0,

where d _z is the diameter of the location of the lower points of the cutouts in the form of a concave arc,

when d _z = d _n -2δ,

where δ is the depth of the cut in the form of a concave arc relative to the outer diameter of the elastic element.

Each cutout can be made in the form of an arc, which at points located symmetrically with respect to the midline between two adjacent holes, touches two conditional circles, in turn, relating to the outer diameter of the elastic element, and the centers of these conditional circles coincide with the centers of neighboring holes in an elastic element, in this case, the cut-out lines in the form of a concave arc can smoothly transition into arcs of circles touching the outer diameter.

In alternating cutouts in sections of the elastic element operating in compression, additional coaxial cuts in the form of a concave arc can be made with the ratio of the diameter of the lower points of the additional cut in the form of a concave arc and the diameter of the centers of the holes in the elastic element corresponding to the expression:

d ₁ / d _r = 0.8-1.0,

where d _r is the diameter of the location of the centers of the holes in the elastic element;

d ₁ - the diameter of the lower points of the additional cutout in the form of a concave arc;

the ratio of the radius of the additional cut in the form of a concave arc and the radius of the base cut in the form of a concave arc corresponds to the expression:

r / r _paz = 0.5-0.7,

where r is the radius of the additional cut in the form of a concave arc;

r _paz is the radius of the base cut in the form of a concave arc.

New significant features that distinguish the present technical solution from the prototype and analogues from the prior art are the proposed configuration of the elastic elements and the ratio of the geometric dimensions of the cutouts in the form of concave arcs and the corresponding parameters of the annular elastic element:

- the ratio of the outer diameter of the elastic element and the diameters of the centers of the holes in the elastic element corresponds to the expression d _n / d _r = 1.15-35, where d _n is the outer diameter of the elastic element, d _r is the diameter of the centers of the holes in the elastic element;

- the ratio of the diameter of the arrangement of the lower points of the cuts in the form of a concave arc to the diameter of the arrangement of the centers of the holes in the elastic element corresponds to the expression d _z / d _r = 1.0-2.0, where d _z is the diameter of the arrangement of the lower points of the cuts in the form of a concave arc, at d _z = d _n -2δ, where δ is the depth of the cut in the form of a concave arc relative to the outer diameter of the elastic element; both ratios are obtained as a result of optimization calculations in which both parameters (the outer diameter of the elastic element and the depth of cut) were considered simultaneously, and failure to fulfill these ratios will lead to a decrease in the strength and compensating properties of the coupling, an increase in its rigidity and mass;

- each cutout can be made in the form of an arc, which at points located symmetrically relative to the midline between two adjacent holes, touches two conditional circles, in turn, relating to the outer diameter of the elastic element, and the centers of these conditional circles coincide with the centers of neighboring holes in elastic element; in addition, the cut-out lines in the form of a concave arc can smoothly transition into arcs of circles touching the outer diameter; this configuration provides a solution to the problem due to the geometric construction algorithm, in which the geometric parameters of the elastic element are matched with the above relations, moreover, a smooth transition of the cut-out lines in the form of a concave arc into the arcs of circles touching the outer diameter is especially suitable for high-speed couplings, because . allows to reduce ventilation power losses in the coupling, due to which to increase its efficiency and durability;

- in alternating cuts in the sections of the elastic element working in compression, additional coaxial cuts in the form of a concave arc can be made, which, in particular, are also useful in high-speed couplings (at a speed of n≥10000 rpm), where they allow reinforcing the effect obtained using the above ratios for basic cuts, that is, to further reduce the mass of the coupling, increase its compensating properties and reduce stiffness;

- the ratio of the diameter of the lower points of the additional cut in the form of a concave arc and the diameter of the location of the centers of the holes in the elastic element corresponds to d ₁ / d _r = 0.8-1.0, where d _r is the diameter of the location of the centers of the holes in the elastic element, d ₁ - the diameter of the lower points of the additional cut in the form of a concave arc;

- the ratio of the radius of the additional cut in the form of a concave arc and the radius of the base cut in the form of a concave arc corresponds to the expression r / r _paz = 0.5-0.7, where r is the radius of the additional cut in the form of a concave arc, r _paz is the radius of the base cut in the form of a concave arc. As for the base cuts, both relations were obtained as a result of optimization calculations in which both parameters (radius and depth of the additional cut) were considered simultaneously. Failure to comply with these ratios will primarily lead to a decrease in the strength characteristics of the coupling and the threat of its premature failure, as well as to failure to obtain the desired effect - to increase the compensating properties of the coupling and reduce its stiffness.

Thus, the disclosed essential features that distinguish the claimed technical solution from analogues and prototype of the prior art are new and meet the criteria of an inventive step, due to the non-obviousness of a specialist of average skill. Moreover, they are necessary and sufficient to achieve a positive effect, that is, the technical task posed.

The invention is illustrated by drawings:

figure 1 shows a longitudinal section of an example of a specific embodiment of the coupling with two packages of elastic ring elements corresponding to the claimed invention;

figure 2 - elastic ring element made in accordance with the invention;

figure 3 is an example of a resilient ring element in figure 2 in accordance with claim 2 of the claims;

figure 4 is an example of a resilient ring element in figure 3 in accordance with claim 3 of the claims;

figure 5 is an example of the execution of the elastic ring element in accordance with paragraph 4 of the claims.

The coupling (Fig. 1) consists of two coupling halves 1 mounted and fixed motionlessly at the ends of the connected shafts, two packages of elastic ring elements 2 attached to the coupling halves 1, and an intermediate sleeve 3 whose flanges are attached to the packages of elastic ring elements 2. The coupling is provided an intermediate ring 4. On the outer diameter of the annular element (Figure 2) concave arcs are made. In a specific embodiment, the ratio of the outer diameter d _{n of the} elastic element and the diameters d _{r of the} location of the centers of the holes in the elastic element is 1.2, and the ratio of the diameter d _{z of the} location of the lower points of the cuts in the form of a concave arc to the diameter d _{r of the} location of the centers of the holes in the elastic element is 1.03. Each cutout (Figure 3) subject to the above ratios of parameters can be made in the form of an arc, which at points located symmetrically with respect to the midline between two adjacent holes, touches two conditional circles, in turn, relating to the outer diameter of the elastic element, and the centers of these conditional circles coincide with the centers of neighboring holes in the elastic element. In addition, with the same parameters, Fig. 4, the cut-out lines in the form of a concave arc can smoothly transition into arcs of circles touching the outer diameter. In addition, in alternating cutouts of the elastic element (Figure 5), subject to the above conditions, additional coaxial cuts in the form of a concave arc can be made in the sections of the elastic element working in compression with the ratio in the specific example of the execution of the diameter d _{1 of the} location of the lower points of the additional cutout in the form of a concave arc and the diameter d _r of apertures center locations in the resilient element equal to 0.95, the radius ratio r additional cutout in the form of a concave arc and the radius r _paz base cutout in the form wog Uta arc may be equal to 0.5.

The clutch with the inventive elastic ring elements operates as follows. When one of the shafts rotates, the torque is transmitted to the coupling half 1 fixed at its end, and then to the intermediate ring 4 attached to the flange of this coupling half, then to the package of elastic elements 2 and to the intermediate sleeve 3 attached to this package. the moment is transmitted through the second package of elastic elements 2 to the second intermediate ring 4, the second coupling half 1 and then to the driven shaft, informing it of revolutions with overcoming the working moment of resistance.

Claims (4)

1. The elastic ring element of the couplings of the rotating shafts with holes and cuts in the form of a concave arc on the outer diameters, characterized in that the ratio of the outer diameter of the elastic element and the diameters of the centers of the holes in the elastic element corresponds to the expression:
d _n / d _r = 1.15-1.35,
where d _n is the outer diameter of the elastic element;
d _r - the diameter of the centers of the holes in the elastic element,
the ratio of the diameter of the lower points of the cuts in the form of a concave arc to the diameter of the location of the centers of the holes in the elastic element corresponds to the expression:
d _z / d _r = 1.0-2,
where d _z is the diameter of the location of the lower points of the cutouts in the form of a concave arc,
when d _z = d _n -2 δ, where δ is the depth of the cut in the form of a concave arc relative to the outer diameter of the elastic element. 2. The elastic element according to claim 1, characterized in that each cutout is made in the form of an arc, which at points located symmetrically with respect to the midline between two adjacent holes, touches two conditional circles, in turn, relating to the outer diameter of the elastic element, the centers of these conditional circles coincide with the centers of neighboring holes in the elastic element. 3. The elastic element according to claim 2, characterized in that the cut-out lines in the form of a concave arc smoothly pass into the arcs of circles touching the outer diameter. 4. An elastic element according to any one of claims 1 and 2, characterized in that in the alternating cuts in the areas operating in compression, additional coaxial cuts are made in the form of a concave arc, with a ratio of the diameter of the lower points of the additional cut in the form of a concave arc and diameter the location of the centers of the holes in the elastic element corresponding to the expression:
d ₁ / d _r = 0.8-1.0,
where d _r is the diameter of the location of the centers of the holes in the elastic element;
d ₁ - the diameter of the lower points of the additional cutout in the form of a concave arc,
the ratio of the radius of the additional cut in the form of a concave arc and the radius of the base cut in the form of a concave arc corresponds to the expression:
r / r _paz = 0.5 ... 0.7,
where r is the radius of the additional cut in the form of a concave arc;
r _paz is the radius of the base cut in the form of a concave arc.

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