MD2995B1

MD2995B1 - Friction precession variable-speed drive

Info

Publication number: MD2995B1
Application number: MDA20040305A
Authority: MD
Inventors: Ion Bostan; Valeriu DULGHERU; Tudor COZMA
Original assignee: Universitatea Tehnica A Moldovei
Priority date: 2004-12-28
Filing date: 2004-12-28
Publication date: 2006-02-28
Also published as: MD2995C2

Abstract

Inventia se refera la industria constructoare de masini, in special la variatoare mecanice. Variatorul precesional cu frictiune include o carcasa cu capace (4), in care este amplasat un arbore condus (22), un arbore conducator (11), montat pe el un mecanism de transformare a miscarii lui in miscare precesionala a satelitului (1), o roata centrala (2) cu suprafata sferica interioara, totodata, roata centrala si satelitul sunt arcuite unul fata de altul. Mecanismul de transformare a miscarii arborelui conducator in miscare precesionala a satelitului contine o manivela telescopica (8) unita cu el, un capat al careia este amplasat intr-un canal radial (9) al unui disc (10), fixat rigid cu arborele conducator (11), iar al doilea este unit cinematic prin parghii, manivele si culise cu bile inertiale, amplasate intr-un alt canal radial al discului, perpendicular cu primul. Satelitul (1) este montat pe un suport sferic (7), unit cu manivela telescopica (8) si legat cu capacul carcasei prin intermediul bolturilor curbilinii (5), fixate rigid in el. In canalele axiale, executate in arborele condus (22), sunt amplasate plonjoare arcuite (19), capatul liber al fiecaruia contacteaza cu suprafata frontala plana (18) a satelitului, iar de partea laterala a fiecarui plonjor este fixata o rola (20), amplasata simultan intr-o canelura axiala (21), executata pe suprafata exterioara a arborelui condus (22), si intr-o canelura inclinata (23), executata pe suprafata interioara a unui suport, care are in sectiunea transversala o forma de sectoare de cilindru, fixate rigid pe suprafata interioara a unui disc (24), dotat cu profil exterior dintat. In butucul tubular (3) al rotii centrale (2) sunt fixate rigid discuri (26) unite cinematic prin elemente rulante (25) cu profilul dintat exterior al suporturilor.The invention relates to the machine building industry, in particular to mechanical variators. The frictional precessional drive includes a housing with caps (4), in which a driven shaft (22), a driving shaft (11) is located, mounted on it a mechanism to transform its movement into a precessional movement of the satellite (1), a central wheel (2) with the inner spherical surface, at the same time, the central wheel and the satellite are bent one against the other. The mechanism of transforming the driving shaft movement into the precessional movement of the satellite contains a telescopic crank (8) coupled with it, one end of which is located in a radial channel (9) of a disc (10), rigidly fixed to the driving shaft (10). 11), and the second is kinematically joined by the levers, cranks and inertial balls, located in another radial channel of the disc, perpendicular to the first. The satellite (1) is mounted on a spherical support (7), joined by the telescopic crank (8) and connected to the housing cover by means of the curvilinear bolts (5), rigidly fixed to it. In the axial channels, executed in the driven shaft (22), are placed arched plungers (19), the free end of each one contacts with the flat front surface (18) of the satellite, and on the side of each plunger is fixed a roller (20), located simultaneously in an axial groove (21), executed on the outer surface of the driven shaft (22), and in an inclined groove (23), executed on the inner surface of a support, which has in the cross-section a shape of sectors of cylinder, rigidly fixed to the inner surface of a disc (24), equipped with toothed outer profile. In the tubular hub (3) of the central wheel (2) are rigidly fixed discs (26) kinematically linked by rolling elements (25) with the outer toothed profile of the supports.