Title of Invention

A COWL FAN THE CONTINUOUS VARIBLE TRANSMISSION DRIVE SYSTEM OF A MOTOR VEHICLE

Abstract

A cow fan for a continuous variable transmission drive system comprising a cowl having an involute configuration, said cowl having a fan rotatably mounted at the inlet of the cowl, the gap between the .tips of the blades of the fan and the sidewall of the cowl increasing progressively, by reason of the said involute configuration, so as to cause the air from the fan to flow through the said gap with increased velocity, and emerge at the outlet of the cowl directly on to the belt of the said drive system

Full Text

This invention relates to a cowl fan for the continuous variable transmission drive system of a motor vehicle, such as a motor cycle or other motor vehicle to which this invention is applicable In the conventional continuous variable transmission (CVT) drive system, the belt of the said system needs to be cooled during operation. A fan is mounted on the tip of the crankshaft, the fan drawing air through the inlet of the variator cover. This air is circulated in the transmission area to cool the belt. Normally there is a separator is fitted between the inlet and fan. With the engine running, the fan, which is moimted on the crankshaft, also rotates, chums and "throws" the air over the belt, but fails to direct the air directly on to the belt. This invention, therefore, seeks to obviate the above-mentioned drawback. The cowl fan for a continuous variable transmission drive system, according to this invention, comprises a cowl having an involute configuration, said cowl having a fan rotatably mounted at the inlet of the cowl, the gap between the tips of the blades of the fan and the sidewall of the cowl increasing progressively, by reason of the said involute configuration, so as to cause the air from the fan to flow through the said gap with increased velocity, and emerge at the outlet of the cowl directly on to the belt of the said drive system. Reference will now be made to the accompanying drawings which illustrate by way of example, and not by way of limitation, one of the various possible embodiments of this invention, wherein Figs. 1 and 2 illustrate the bottom and top views of the cowl fan embodiment Fig. 3 illustrates the cowl fan embodiment in exploded view. And Fig.4 illustrates the drive system with belt and cowl. The cowl C has an involute configuration as can be seen from Fig.2, the said configuration being indicated by the arrows A. The cowl C has a fan F rotatably mounted at the inlet D of the cowl, the gap between the tips T of the blades B of the fan F and the sidewall W of the cowl increasing progressively, as indicated by Gl G2 G3, by reason of the said involute configuration. Thus the air from the fan F, passes through the progressively increasing gap, and emerges at the outlet O with increased velocity. The said outlet \s aligned with the belt W (Fig.4) of the said drive system to enable the flow of air to travel directly on to the belt and thus cool the belt efficiently. The outlet O is tapered at H to facilitate the flow of air directly on to the belt. J is the guide wall provided for the cowl. The terms and expressions herein are of description and not of limitation, as these do not exclude any equivalent of the features illustrated and described, but various other embodiments of this invention are possible without departing from the scope and ambit of this invention. We Claim: 1. A cowl fan for a continuous variable transmission drive system comprising a cowl having an involute configuration, said cowl having a fan rotatably moimted at the inlet of the cowl, the gap between the tips of the blades of the fan and the sidewall of the cowl increasing progressively, by reason of the said involute configuration, so as to cause the air from the fan to flow through the said gap with increased velocity, and emerge at the outlet of the cowl directly on to the belt of the said drive system. 2. A cowl fan as claimed in Claim 1 wherein the outlet is tapered. 3. A cowl fan as claimed in Claim 1 or Claim 2 wherein the cowl is. provided with a guide wall. 4. A cowl fan for a continuous variable transmission drive system of a motor vehicle substantially as herein described and illustrated with reference to the accompanying drawings.

Documents:

249-che-2003 claims duplicate.pdf

249-che-2003 description (complete) duplicate.pdf

249-che-2003 drawings duplicate.pdf

249-che-2003-claims.pdf

249-che-2003-correspondnece-others.pdf

249-che-2003-correspondnece-po.pdf

249-che-2003-description(complete).pdf

249-che-2003-drawings.pdf

249-che-2003-form 1.pdf

249-che-2003-form 19.pdf

249-che-2003-form 26.pdf