SU1663274A1 - Chain gear - Google Patents

Abstract

The invention relates to mechanical engineering and can be used as an element of drives for various machines and mechanisms. The purpose of the invention is to increase reliability by reducing shock loads and wear of the working profiles. When the transfer unit 4 is engaged with one of the rollers 2 working profile on the outer surface of the tooth 5, and with an adjacent roller 2 sprocket 1 - working profile on the inner surface of the tooth 5. 2 Il.

Description

The invention relates to mechanical engineering, can be used as an element of drives for various machines and mechanisms, and is an improvement of the invention according to the author. St. No. 1567828.

The purpose of the invention is to increase reliability by reducing shock loads and wear of the working profiles.

Figure 1 shows the engagement of a chain with one of the sprockets; figure 2 - chain link.

The chain drive contains the lead 1 and the slave (not shown) sprockets with the engagement elements in the form of rollers 2, whose centers are displaced from the pitch circles to the centers of the sprockets, and covering the last chain 3, the links 4 of which are shaped plates with two symmetrical relative to the transverse axis teeth 5 and have working profiles for interaction with rollers 2. Working profiles are made on the external and internal surfaces of each tooth 5, and the center of displacement hpz roller 2 and radius rpz roller 2

identified for each asterisk by the following dependencies.

hpz Knz Pw Knz (COS 0,5 Gr - sin 0,5 Tp tg pc) / cos yc + 0,5 tg pc Pw

Tpz Kpz Pw 0.5 / COS (

-Knz (Sin 0.5 Gy / (COS yc COS c) -tg ye) - Ku Pw, where

Knz 0,5 (1 - sin pc) / COS pc - K U Km in /

// cos 0.5 rp + sin 0.5 Tp (1 - sin tpc) /

/ cos - sin yc / cos DC 1 is the differential coefficient of normal displacement;

Tips is the fill factor of the step distance of the link, which is determined from the same relationship for the value Knz sin pc cos gr;

(L

WITH

about

Os

GO GO XI Ј

 YU

Kuc Uc / Pvr- DISTANCE COEFFICIENTAt the Gmsee Sintteo,

from the center of the hinge to the outer surface where

sti of tooth 5; gmze (gs + rpzmin) - Tp 2 l / zp - angular pitch of rollers 2;

US "eo - 0.5 Gy And RS" eo Tr - UGLO-5 hpzmin / Sin Oeo).

the common parameters of the displacement of the common tangent to the working profiles of the elements U Knzmin Pw / sin "eo;

 initial angle of profile Rounding radius of the upper non-working

external working profile; faces: PW - the initial step of the chain link 3;

Zp - NUMBER OF ROLLERS 2.YY 0.5 Pw / COS Oeo + Ue

The diameter dwp of the initial circumference of the rollers 2, the diameter dp of the rollers 2 and the diameter dw ,. The distance from the axis of the hinge to the top of the initial circumference of the tooth arrangement of 5 chain links 3 is determined by the dependencies: h h - hyK

Where

dwp COS Us / Sin 0,5 Tr - 2 Knz) / h Pw (ku - Knzmin tg Cfeo) to

/ COS0c pw, 20 "COSOeo / Sin (" eo + Ј0eo) +

dp 2 0.5 / COS (fa - Knz (Sin 0.5 Gy / + Knzmin / COS Cfeo hh - distance from the hinge center to the exact / cos ffc cos) - tg us) - Ku Pw, ki taper tooth 5 ;.

d (1 / sin05r psamin 2 rsmmcos "eo - minimal

w p w the width of the tooth link at the top;

g, s. . .r5min 0.75-3.0 - minimum radius

The working profile on the outer surface of the tooth 5 is composed of a straight section 6 and with a c / c „™ -,", "

of the convex section 7, and the working profile is 30 hyKg. Samin / 2 tg (Zeo, the quantity Uk ° P ° of the inside surface of the tooth 5 consists of

the non-working bottom of the depression 8, the concave work-bottom of the depression 8 described by the Radius

of section 9, transitional concave section

ka 10 and convex tops 11. Gatt 1 -005rP n + °. ° b

Length hNZmin straight section 6 and for the sake of-35 op

depending on the convex section 7, the dependencies and orPDaHM4eHO are determined. Angle m 20 ° simost-Concave working section 9 is described by radius m n with coordinates of the center CrHNZmln Knzmin Pw. .

4Q Transition concave area 10 opig fa 2 + f 2) / 2fs RaAi & Ous is limited by angle

.

where the convex vertex 11 is described by the radius Knzmin sin (Oeo - (2 / Zpmm)) xyr from the point with the coordinates of the center of the curvature

V COS (2 L / Zpmm), Ez) Crms COS Ofeo + a 31

Eh Pw (Ku - Knzmin tg Oeo) Xb3 | GM31 Sin Ofeo,

x cos e "eo / sln (Oeo + e" in), 50 where a i, KnZ pw / sin Oe0.

 f v v Working profile on the inside

IX Pw (Ku Knzmin tg Ofeo) eire

fn u IIOIIHI in cu, Yunrru iwfia minwoT RUTI. appppkgmmmppa

tooth 5 can be approximated by a working circular profile determined by the equation

tooth 5 can be approximated by a working circular profile determined by the equation

x Jl- coseaeoslnaeo / sin (“eo + Ј0eo) l. Working circular profile with a radius of

edeo -3-5 deformation increment-55.22 2

the angle of the external profile. (Xkiz a |) Mg bi) n

Coordinates of the center from which it is described.

radius rz defined by dependencies: where (J 5 and

  Pw (Knz - Kpz Sin С / 12) Zze Gme COS "eo + CЈ3e,

UK1G

eire

Yunrru iwfia minwoT RUTI. appppkgmmmppa

tooth 5 can be approximated by a working circular profile determined by the equation

Working circular profile with a radius of

UK1G

- coordinates of common points of contact Ki, elements of engagement relative to the center of the hinge of the link with the calculated number Zpi Zpmin, rollers 2;

O i2 ' + Tr - preliminary values of pressure angles;

O) is the initial angle of the profile of the inner face;

hpzmln, hpzv-, Grpnp, 1 fpz «, Knzmin, Knzf are defined for the numbers ZP Zpmin and Zp of the rollers 2.

The chain transmission works as follows

The rotation of the drive sprocket via chain 3 is transmitted to a driven sprocket (not shown). The link 4 is engaged with one of the rollers 2 by the working profile on the outer surface of the tooth 5, and with the adjacent roller 2 by the working profile on the internal surface of the tooth 5. At the same time, the distribution coefficient of the normal forces

Where

Knz 0,5 (1 - Sin (pc У COS UES - K ah min /

// cos 0.5 rp + sin 0.5 rp (1 - sin pc) /

/ COS - Sin yc j / COS yc I - differential coefficient of normal displacement;

Kuhmin is the fill factor of the step distance of the link, which is determined from the same dependence for the value Knz sin pc cos rp;

KUc Ue / Pw - distance coefficient

from the hinge center to the external working profile;

Tr 2 JT / ZP - angular pitch of rollers;

US Oeo 0.5 Tr and fs Oeo - Tr are the angular displacement parameters of the common tangent to the working profiles of the engagement elements;

Cr N FNe / FNi

provided within 0.67 KHNN 0.76, which almost doubles the load capacity for wear profiles.

The coefficients of the decrease in the impact velocity Kue, Kyi are determined from the dependencies

Kue I - Knz

KU | 0.5 - (Khz / tg flz) "sin flz / sln fl;

Claims (1)

where (240 / z). Claims of the invention St. No. 1567828, characterized in that, in order to increase reliability by reducing shock loads and wear of working profiles, the latter are located on the outer and inner surfaces of the tooth, the hpz offset of the roller center, the radius of the roller and the diameter dwp of the initial circle are determined for each asterisk following dependencies: hpz Knz (cos 0,5 gr - sin 0.5 rp tg) / / cos yc + 0,5 tg fb Pw, rpz 0,5 / cos (Knz (sin 0,5 rp / / (cos yc cos pc) - tg yc) - Kn Pw. dwp cos yc / sin 0,5 rp - 2 Kuc) / / (cos f) with Pw. thirty 35 40 45 Ofeo - 30 ° - the initial angle of the profile of the external working profile; PW - the initial step of the chain link; Zp is the number of rollers, the working profile on the outer surface of the tooth is described by a curve consisting of a straight line of length adjacent to each other. hNzmin KhzminPw and a circular area with a radius of gz (ah2 + fx2) / 2fx. with the coordinates of the point from which it is described Eze Gmee COS fifeo + Jaze Where take $ 1pa Knzmln Sin (Oeo 2 L / Zpmm) X X COS (2 JT / Zpmin), Eh Pw (Ki - Knzmin tg Oeo) X X COS Ј Cfeo / Sin (Oeo + B “eo). x 50 fx Pw (Ku Knzmln tg Oeo) X / f- cOSЈaeoSin "eo / Sin (flfeo + f OeO) I, fideo- 3-5 ° - deformation increment of the angle of the external profile. Gmze (HZ N Tpzmin) hpzmln / Sin Oeo). Gmee (GZ + rpz l)) - hpz ate / sin Ofeo, I ee Knzmln Pw / Sln Oeo ( the working profile on the inner surface of the tooth is described by a curve consisting of a circular depression interconnected with each other, limited by the angle a - the dius 20 and having a ra / Tamln 1.05Z pzmln + 0.05 a concave circular area whose radius n and the coordinates of the center of curvature are determined from the equation (XKiz-ai) 2 + (Ykiz-bi) 2 r, 2. where XKiz 0,5 PW - rpz cos in   hpz-rp2Sln # 2. and 0 five defined for three roller numbers Zpl Zpmin,,,  "Eo + Tr is a preliminary value of the pressure angle of the transitional concave portion of radius г г pz «, the ordinate of the center of curvature of which is equal to hpZoo, and the non-working vertex is described by a radius rz from a point with coordinates a3i GMZ (COS Oeo + a 31 Lz1 Gmz Sin "eo where a si Knz v) pw / sin Oeo, hpzmm, hpz tn, fpzmin,, Knzmln, Knz limit values of the vertical displacement ordinates of the rollers and normal displacement coefficients, which are determined for the number of rollers zp zpmfn and zp oo. (pus i N po 53 in