SPLIT PULLEY

Abstract: The invention proposes to form the flanges (11, 12) of a driving pulley as a part of the driving shaft (10), for example by moulding the shaft (10) and the flanges (11, 12) so as to constitute one unit, the portions (18, 19) of the driving pulley being attachable between the said flanges (11, 12).

Description: SPLIT PULLEY The present invention relates to a driving pulley arranged on an essentially cylindrical rotary shaft which is provided, at its ends, with pins for supporting the shaft. In earlier known arrangements a pulley was formed as a separate unit which was placed on the shaft during assembly, and fixed there by riveting, screwing, or other suitable procedure. Alternatively the pulley consisted of two halves screwed to each other by bolts and in that manner were attached to the shaft. These pulleys were used mainly for transmitting larger forces. These devices have a complicated construction and are troublesome to assemble. Further, they demand close tolerances during manufacturing so that the shaft will not jam during assembly and thus be exposed to defective load or in extreme cases to become bent. The purpose of the invention is to eliminate the above drawbacks and to provide a driving pulley wherein the shaft and the flanges of the pulley can be adapted in one piece and in which the following assembly work is simplified. The purpose has been achieved by the device according to the invention obtaining the characteristic features stipulated in the following claims. Further advantages of the invention will be obvious in the following description of an embodiment in connection with the accompanying drawing wherein Fig. 1 is a schematic bottom view of a portion of a shaft having the flanges of the driving pulley, Fig. 2 is a section along the line II - II in Fig. 1 which in addition shows both portions of the driving pulley before the assembly. The shaft, as a whole designated by 10, has two radial flanges 11,12. Outside the flanges the shaft in the embodiment is cylindrical but in the space between the flanges it has two diametrically lying plane surfaces 13,14 for providing a turning-proof connection between the driving pulley and the shaft. Naturally any other suitable profile would be fully conceivable. In the surfaces facing each other on the flanges 11,12 notches 15,16 are formed, said notches being essentially perpendicular in relation to the plane surfaces 13,14. The driving pulley 17 comprises two identical semicircular portions 18,19 each of them being separately placeable in the space between the flanges 11,12. Each portion 18,19 is at its one end provided with a steering pin 20,21 respectively which during the assembly of the portions are intended tα fit into corresponding grooves 22,23 respectively at the other ends of the portions 18,19. On the side walls of the driving pulley 17 elevations 24,25 are adapted which during the assembly of the portions 18,19 snap into notches 15,16 and lock the portions 18,19 in place between the flanges 11,12. In addition, each portion 18,19 has on its inside two opposed plane surfaces 26,27 the extension of which being half the length of the plane surfaces 13,14 so that when the portions 18,19 have been placed between the flanges 11,12 a turning-proof connection is achieved between the driving pulley 17 and the shaft 10. A driving belt, not shown, grips into teeth 28 adapted in the periphery of the driving pulley 17 for transmission of power from a driving member, not shown. Both the shaft 10, flanges 11,12 delivered with a profile between the flanges and the notches 15,16 can be moulded for instance of plastics. In the same manner the portions 18,19 of the driving pulley 17 together with the steering pins 20,21 and the grooves 22,23 are manufactured by the same procedure which decreases the manufacturing costs. By this arrangement, on one hand the assembly of the driving pulley is simplified, on the other hand, gluing, welding, or other attaching of the driving pulley onto the shaft is superfluous. The Invention is not limited to the embodiment shown but several modϊfica- tions are conceivable within the frame of the invention as characterized in the following claims.

Claims: AMENDED CLAIMS (received by the International Bureau on 5 July 1982 (05.07.82)) 1. (amended) Driving pulley mounted on an essentially cylindrical rotary shaft having at its ends pins for supporting the shaft, characterized in that the flanges (11,12) of the driving pulley (17) constitute a unit with the shaft (10), and the driving pulley (17) comprises two identical semicircular portions (18,19) which are attachable on the shaft portion between the flanges (11,12). 2. (amended) Driving pulley according to Claim 1, characterized by two dia¬ metrically disposed plane surfaces (13,14) shaped on the shaft (10) between the flanges (11,12) and the same profile (26,27) on the inside of the driving pulley (17) for turn-proof connection between the shaft (10) and the driving pulley. 3. Driving pulley according to Claim 1, characterized in that each portion (18,19) of the driving pulley has at its one end a steering pin (20,21) intended to fit into grooves (22,23) shaped in the other portion of the driving pulley. Driving pulley according to Claim 2, characterized in that notches (15,16) are adapted in the surfaces facing each other of the flanges (11,12) into which notches elevations (24,25) formed on the side wails of the portions (18,19) are intended to snap during the assembly of the driving pulley (17) on the shaft (10). 5. Driving pulley according to Claim 1, characterized in that both the shaft (10) and the flanges (11,12) are moulded in one piece of for Instance plastics. 6. Driving pulley according to Claim 1, characterized in that the portions (18,19) of the driving pulley are made of a plastic material.

Inventors: FRANCKE KURT OSKAR, STRAND TEN TORBJOERN
Applicants: ELECTROLUX AB, FRANCKE KURT OSKAR, STRAND TEN TORBJOERN
Application year: 1982
Main classification: F16H55
IPC codes: F16H55