SU644992A1 - Reinforced gear - Google Patents

Description

one

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

A known reinforced gear wheel containing metallic reinforcement in the form of a gear wheel with thinned teeth lined with an adhesive layer of polymer 1 adhered to them. Polymer facing of the teeth of this wheel above the lower boundary of the active profile has a constant thickness.

The disadvantages of this design are the unequal contact stiffness in the single-pair and two-pair engagement phases, high dynamic loads, low smoothness and accuracy.

The aim of the invention is to equalize the contact stiffness in the single-pair and two-pair engagement phases, reduce the dynamic loads, increase the ride smoothness and increase the kinematic accuracy.

For this, in the proposed reinforced gear wheel, the polymer facing is made with a smooth increase in its thickness from the pole line to the top of the tooth and to the lower border of the active profile, and the side surfaces of the reinforcement teeth are with a profile modification, the depth change factors of which at characteristic points in the profile are determined by

Oi

Where

  , (Tft-

ftai is the thickness of the polymer lining on the circumference of the teeth;

Pi, P ;, rtg, pr - radii of curvature at characteristic points a, u, vip line of engagement, the substitution of indices i, j, n, I is made from the first, second and third columns of the table, respectively

wherein

a: TPi TVi 1;

to

; 0

T.

.1-AGU gear and wheel indexes. The drawing shows one tooth wheel. The wheel contains metal rebar in the form of a gear wheel (not shown) with thinned teeth 1 lined with an adhesive layer of polymer 2 fixed to them, made with a smooth increase in its thickness from the pole line (not shown) to the top of the tooth 1 and to the bottom boundary of the active profile (point P). For this, the lateral surface 3 of the teeth 1 of the reinforcement is made with a profile modification, the depth variation factors of which at the characteristic points a, and, V, p the tooth profile are determined by the formula 9i l-Yl-i ha, vt, i, Aa, -thickness polymeric facing on the circumference of the tops of the teeth; P6 PJ, RP, p / -radius of curvature at characteristic points a, i, v, p of the line of entanglement, the substitution of indices i, j, n, I is made respectively from the first, second and third columns of the table

wherein

Pot - Tpi - Tfi - 5

(ib) -

1,2- wheel and wheel indexes.

The thickness Ne, hv, hp of the polymer lining at the corresponding points and, v, p is determined by multiplying the thickness Aoi of the polymer lining on the circumference of the tooth tips by the corresponding coefficient PU, PD calculated by the above formula. pp change the depth of the profile modification of reinforcement.

When the wheel is in gear, due to the variable thickness of the lining of the active profile of tooth 1, there is a different compression of the lining layer in different phases of engagement, which causes correspondingly different reactive force.

wherein

% - Tpi - 1; (0,

Claims (1)

1,2 - gear and wheel indexes. Sources of information taken into account in the examination 1. USSR Author's Certificate No. 523221, cl. F 16H 55/16, 1975. This allows a significant increase in the quality of the gear that uses the wheel. Claims of the invention A reinforced gear wheel containing metal reinforcement in the form of a gear wheel with thinned teeth, coated with an adhesive layer of polymer attached to them, characterized in that, in order to level the contact stiffness in single-pair and two-pair engagement phases, reduce dynamic loads, increase smoothness and increasing kinematic accuracy, the polymer facing is made with a smooth increase in its thickness from the pole line to the tooth vertex and to the lower border of the active profile, and the flanges of the teeth of the reinforcement are with a profile modification, the coefficients of change of the depth of which at the characteristic points of the profile are determined by the formula 91 1- / T-1I; P / -, l, m.); fnfl ya, is the thickness of the polymer lining on the circumference of the tops of the teeth; Pi) Ps. RP, pr - radii of curvature at characteristic points a, u, v, p of lines of entanglement, substitution of indices i, j, n, I is made from the first, second and third columns of the table, respectively i "