Browse Prior Art Database

Metal Reinforced Plastic Gear Rack

IP.com Disclosure Number: IPCOM000103865D
Original Publication Date: 1993-Feb-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Hu, PY: AUTHOR [+2]

Abstract

To reduce acoustic noise as well as life in a heavily loaded pinion/rack gear situation, it is necessary to introduce a plastic gear/rack combination. Disclosed is a technique to combine the quietness of the plastic gear and, at the same time, have the strength of the metal gear. Disclosed, in particular, are techniques for producing a metal reinforced plastic gear rack. Since the rack is linear, the method is quite unique in comparison to a completely circular system.

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Metal Reinforced Plastic Gear Rack

      To reduce acoustic noise as well as life in a heavily loaded
pinion/rack gear situation, it is necessary to introduce a plastic
gear/rack combination.  Disclosed is a technique to combine the
quietness of the plastic gear and, at the same time, have the
strength of the metal gear.  Disclosed, in particular, are techniques
for producing a metal reinforced plastic gear rack.  Since the rack
is linear, the method is quite unique in comparison to a completely
circular system.

      As shown in the figure, a metal blank was made which has the
basic triangular profile.  The metal gear tooth protrudes from the
base towards the very tip.  The tooth profile provides not only
anchoring at the base of each and every tooth, but also extends very
far towards the tip, so that sufficient support is provided for each
tooth from the base to the tip.  Under all circumstances, there will
be metal to metal cinematic force contact reinforcement.  The
circular base anchor, as shown in the figure, prevents the plastic
coating from breaking away during very heavy loading and unloading
gearing operation.  In addition, the teeth are cut in the central
region to provide further mechanical anchoring to ensure there is no
breakaway possibility for the coating.

      It is desirable to make the rack to be 48 inches long;
therefore, the length is divided into 4 parts: 2 20 inch sections (22
teeth each) and 2 14 inch sections (31 teeth each). ...