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Browse Prior Art Database

Speed Reducer

IP.com Disclosure Number: IPCOM000095911D
Original Publication Date: 1964-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Dollenmayer, WL: AUTHOR

Abstract

The speed reducer supplies a high reduction with only two ball bearing assemblies.

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Speed Reducer

The speed reducer supplies a high reduction with only two ball bearing assemblies.

Ball bearing assemblies 1 and 2 are fixedly mounted on shaft 3 that is rotated by motor 4. Assemblies 1 and 2 are radially pre-loaded so that the bearings roll instead of sliding under the operating torque loads encountered. The ball cages of assemblies 1 and 2 are joined together at 5. Outer race 6 of assembly 2 is prevented from rotating by an external support. The output of the reducer is the outer race 8 of assembly 1. The two assemblies 1 and 2 have different geometries, i.e., the diameters of the balls of races of the assemblies differ slightly.

The principles of reduction are illustrated in the lower drawing. In the following equations, N(m) is the input speed of the inner race of both bearings,
i.e., the input speed to the reducer; N(o) is output speed of the outer race of assembly 1, i.e., the output speed of the reducer; R(1) is the reduction of assembly 1 and R(2) is the reduction of assembly 2.

In bearing assembly 2, the speed of the ball cage equals N(m)/R(2). As to output bearing assembly 1, the speed of the inner race relative to the outer race equals N(m)-N(0). The speed of the ball cage of the bearing assembly 1 relative to the outer race is (N(m) - N(0))/R(1). The absolute speed of the ball cage becomes >(N(m) - N(0))/R(1)|+ N(0). However, the of both ball cages is the same, therefore, >(N(m) - N0)/R(1)|+ N(0) = N(m)/R(2). Solving for the reducti...