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Mutilated bevel gear driving two bevel gears alternately, opposite ways

How does a half-toothed bevel gear drive two gears in turn? · Hardware · basis: Xem Studio design following Brown No. 74 (1868)

Also called: mutilated bevel gear, intermittent bevel gear, alternating bevel drive, engranaje cónico mutilado, Kegelrad-Teilgetriebe

Exact dimensions. True size, with no printing tolerance added.

sizes
3 in table

Notes

  • A bevel gear with teeth on only half its rim turns continuously between two bevel gears facing each other: for half a turn its teeth drive one, for the other half the other. The two driven gears face opposite ways, so they turn in opposite directions, each moving half a turn and then resting.
  • Three module 2, 20-tooth spherical-involute mitre gears (one with 10 teeth cut away), cone distance 28.28 mm; drawn with the toothed half in mesh with gear A, gear B free.
  • Brown's No. 74. The driven gears here turn on separate stub shafts so each can rest independently.
  • Parts (each has its own page): mitre-gear-m2-20t-bore5-half-teeth, mitre-gear-m2-20t-bore5, dowel-pins-metric.
  • Brown's movement No. 74 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

Mutilated bevel gear driving two bevel gears alternately, opposite… size chart

parametervalue
drivermitre, 10 of 20 teeth
driven2 × mitre 20 T
each driven gearhalf a turn, then rest

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Henry T. Brown (1868, public domain)Five Hundred and Seven Mechanical Movements — scan on archive.orgwebPublisher's page; dimensions are facts
507movements.comBrown's movement No. 74: figure, his text and an animationwebPublisher's page; dimensions are facts

Free files

★ Free files 1 parts. Xem Studio design: free to use, print and sell things from; not to be republished as files. Xem Studio Design License. index.json

mutilated-bevel-gear-mechanism-assemblyAssembled mechanism, all parts placed at one pose (STEP keeps each part separate)STEP · STL
Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.
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Plain text: sheet.txt · JSON: /api/geometry?object=mutilated-bevel-gear-mechanism

Mutilated bevel gear driving two bevel gears alternately, opposite ways, isometric render of a generated part
Render of mutilated-bevel-gear-mechanism-assembly from the free STEP; not to scale.

Fits with

Mutilated mitre gear, module 2, 20 teeth with 10 kept (half), Ø5 bore, isometric render of a generated part
Mutilated mitre gear, module 2, 20 teeth with 10 kept (half), Ø5 bore39.55×42.78×23.94 mm★ 1 file
Mitre (bevel) gear, module 2, 20 teeth, Ø5 bore, spherical involute, isometric render of a generated part
Mitre (bevel) gear, module 2, 20 teeth, Ø5 bore, spherical involute42.72×42.72×23.91 mm★ 1 file
Dowel pins, 2–6 mm (ISO 2338 / DIN 6325), isometric render of a generated part
Dowel pins, 2–6 mm (ISO 2338 / DIN 6325)5 sizes★ 23 files

Questions

How does a half-toothed bevel gear drive two gears in turn?

A bevel gear with teeth on only half its rim turns continuously between two bevel gears facing each other: for half a turn its teeth drive one, for the other half the other. The two driven gears face opposite ways, so they turn in opposite directions, each moving half a turn and then resting.