SU796562A1 - Gearing - Google Patents

Description

(54) TRANSFER TYPE NOVIKOV

one

; The invention relates to mechanical engineering and can be used in the design and manufacture of gears.

Known gears, with the wheels, the initial contour of which consists of segments of the oil spiral | d1 |

A disadvantage of the famous gear Zak. It includes low wear resistance and high sensitivity to manufacturing and assembly errors.

Closest to the invention in terms of its technical essence and the effect achieved, is a Novikov-type gear train, which contains wheels with the active areas of the original teeth contour, which varies as the distance from the pitch separator goes straight to the theoretical points of contact 2.

The disadvantage of this gear in reduced load capacity

The purpose of the invention is to increase the load capacity.

. This goal is achieved by the fact that the parts of the initial contour located from the theoretical points of contact to the upper and lower points of the active profile are made with a curvature that decreases as the dividing line is removed.

In addition, the areas of the initial contour of teeth from theoretical points of contact to the upper and lower points of the active profile are outlined by arcs of logarithmic spirals, the parameters of which are chosen from the ratio P. / S 3.5: 4.9 / where I - is the radius of curvature, . S is the length of the spiral arc from the pole to an arbitrary point.

The drawing shows the original contour of the teeth of the wheel n p.

Claims (2)

The ACTIVE profile is delineated by conjugated sections of variable curvature, for example, parts of a logarithmic spiral, ab, bc, zel. As you move away from the dividing straight line 1, the curvature of the lines cf Hde increases, c, and the curvature of the arcs b and b decreases. The curvatures of the head profile at the points O and C are approximately equal in modulus of the curvature of the legs at the points f and d, respectively. Direct b and normal to the profile at theoretical points of contact, Evryluta 2-5 active areas. Оom profile I be ef relate to direct fetj and еО at points f and CJ, which are special points of the curve-, return points. Active sections 1 eC and de are matched by the transition line cd A specific choice of the logarithmic spiral parameter can be made, for example, from the condition of direct conjugation of the spirals of sections b and de at the point minutes on the head near the forward healing, as well as providing a point of minimum interface angle profile. Parameters 4, О5648 and 4.31О29, selected in the specified range, meet these requirements, respectively, for a head and a leg of an initial contour having the following characteristics: profile angle at theoretical contact points 26 ° j height from theoretical contact points TO dividing straight 0.525 module: the minimum angle of the profile is 12 differences of the radii of curvature at the theoretical points of contact between the legs and the head 0.2 module — head height 1 module. Let us represent the equation of the paharithmic ones: an etiquette with the parameters 4.05648 and 4.31O29 in polar coordinates, the polar axes of which pass through the centers of the spirals and the theoretical points of contact: Sih (qrcctq 4, OgHe) 40S648t S-in Pa- (° 2 (a cct94.3io29), where p and p2. Polar radii of the spiral Ul is a healing module (f is the floor of p7 ANCH angle (the absolute value of the difference in the head profile at the theoretical point of contact and at an arbitrary point of the helix). the heads can be made up of arcs JL and CJ of the logarithmic spiral p - 0.286654; those 4.056484A and the leg sections ed and ef are described Pz. 0,315862 hie 4,31029 f2. Technical and economic effect of applying the proposed transfer is determined by an increase in load capacity of gears by 10% -2 O. Invention 1. A Novikov-type gear transmission containing wheels with curvature of active sections of an input contour teeth, varying as they move away from the pitch straight to the theoretical points of contact, different from TeMj that, in order to increase the load capacity, the sections of the original contour that are located from the theoretical points of contact to the upper and lower points to the active profile, made with a curvature, decreasing as the distance from the dividing line is direct, 2. Transmission gear is in accordance with claim 1, so that sections of the initial contour of teeth from theoretical contact points to the upper and lower points of the active profile are outlined by arcs logarithmic spirals, the parameters of which are chosen from the ratio R / S -3,5: 4,9, where I is the radius of curvature, S is the length of the arc of the spiral from the pole to an arbitrary point. Sources of information taken into account in the examination 1, US Patent No. 2222515, cl. 74-462, 1948. 2. US patent number 3 982445, CP. 74-462 1961 (prototype).