Browse Prior Art Database

Self-Cleaning Tapered Gear Sets

IP.com Disclosure Number: IPCOM000039025D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Harris, RH: AUTHOR

Abstract

Gear sets used to drive paper feed rollers or the like are subject to accumulation of paper dust. As the paper dust builds up, it impacts in the root space of the gears until the compression force required to impact any additional dust exceeds the load that the paper feed drive motor may have. At this point, paper feed failures occur. This disclosure describes tapered addenda and bottom lands across the face width of the gears to provide an increasing tapered gear clearance that allows lateral extrusion of dust and debris to occur as a natural result of the gear face forces. Fig. 1 illustrates an end view of a typical gear set consisting of gears 1 and 2 immeshed with one another. The edges or addenda of the gear teeth are tapered as shown by the the tapered surface 4 as are the lands for the gear teeth 3.

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Self-Cleaning Tapered Gear Sets

Gear sets used to drive paper feed rollers or the like are subject to accumulation of paper dust. As the paper dust builds up, it impacts in the root space of the gears until the compression force required to impact any additional dust exceeds the load that the paper feed drive motor may have. At this point, paper feed failures occur. This disclosure describes tapered addenda and bottom lands across the face width of the gears to provide an increasing tapered gear clearance that allows lateral extrusion of dust and debris to occur as a natural result of the gear face forces. Fig. 1 illustrates an end view of a typical gear set consisting of gears 1 and 2 immeshed with one another. The edges or addenda of the gear teeth are tapered as shown by the the tapered surface 4 as are the lands for the gear teeth 3. A tapered gap 5 exists between the end of a tooth and the bottom land of the other gear, with the taper clearance increasing across the width of the face of the gear tooth from one end surface to the other. As dust becomes impacted in the gear clearance, it will be extruded laterally from the compression forces in the gear-meshing action. The taper on the addenda of each gear tooth is such that a section taken at one side of the gear profile is not altered, while that on the other has the tapered end above the pitch circle. The bottom land 3 is similarly tapered so that clearance is normal on one side and larger than normal on th...