MOUNTING FOR DRIVE MECHANISM OF HEAT EXCHANGER SCREEN CLEANING WAND

摘要

A self-propelled windrower includes an engine compartment containing an engine-driven fan for pulling cooling air through a screen covering a circul ar air inlet leading into the compartment. The fan also is coupled for creating a s uction in an air duct extending diametrically across the air inlet, the duct in tur n being coupled to the center of a channel-like vacuum wand mounted for sweeping the exterior of the screen and removing airborne debris collected by the screen. Provided for rotatably supporting a drive shaft for the wand is a bearing su pport member including a cylindrical portion having an end fixed to a mounting pla te secured to the air duct, the cylindrical portion having an interior end sect ion receiving an outer race of a roller bearing having an inner race receiving a nd being fixed to the wand drive shaft. An electric drive motor is located within sai d compartment and mounted to said air duct at a side thereof remote from said screen. The electric motor is, for example, of a type normally used for driv ing windshield wiper blades and includes a main body disposed at a right angle t o anoutput shaft coupled to the wand shaft by a wedge fi t formed by respective frusto-conical surfaces of the motor output shaft and the wand drive shaft. The motor output shaft projects through a hole providedin the mounting plate of the be aring support member, the hole having an axially short pilot portion to accurately position the motor output shaft relative to the wand drive shaft to minimize misalign ments, and secondly to minimize the binding of the motor shaft.