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Rocker beam 60 / 80 / 100 mm on a 623 pivot
What are the dimensions of a rocker beam for a beam-driven Stirling engine? · Hardware · basis: Centre pivot on a 623 bearing (Ø10 pocket, fit: press); Ø3 end holes (fit: run) at ±L/2
Long Earth Society build part. Frame for the LES 2 in gamma on 2020. The engines
Exact dimensions. Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part. Mating features
- sizes
- 3 in table
Notes
- The walking beam of a beam-driven gamma: one end to the crank's con-rod, the other to the displacer rod, pivoting in the middle.
- A 12 wide × 6 thick bar L + 12 long (72 / 92 / 112) with Ø3 holes at ±L/2 (fit: run) and a Ø10 pocket on centre for a 623 bearing (fit: press).
- With equal arms the ratio is 1:1: the displacer stroke equals the crank stroke.
Sizes
| file | pin centres | length | section | pivot | end holes |
|---|---|---|---|---|---|
| rocker-beam-60 | 60 | 72 | 12 × 6 | Ø10 (623) | Ø3 |
| rocker-beam-80 | 80 | 92 | 12 × 6 | Ø10 (623) | Ø3 |
| rocker-beam-100 | 100 | 112 | 12 × 6 | Ø10 (623) | Ø3 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| rocker-beam pivot pocket | Ø10 | 623 bearing | press | rocker-beam-* |
| rocker-beam ends | Ø3 | Ø3 pins (turn on them) | run | rocker-beam-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Beam engine | web | CC BY-SA 4.0 (text) |
| Wikipedia | Stirling engine | web | CC BY-SA 4.0 (text) |
| Long Earth Society | Engine builds | web, video | LES site |
Free files
★ Free files 3 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| rocker-beam-60 | rocker beam 60 mm, centre pivot on a 623 (Ø10 pocket), Ø3 ends (beam-driven displacer) | STEP · STL |
| rocker-beam-80 | rocker beam 80 mm, centre pivot on a 623 (Ø10 pocket), Ø3 ends (beam-driven displacer) | STEP · STL |
| rocker-beam-100 | rocker beam 100 mm, centre pivot on a 623 (Ø10 pocket), Ø3 ends (beam-driven displacer) | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=rocker-beam
How it fits
Goes in or on
Beam pivot post, 60 mm623 on the post's Ø3 pin
Ball bearings, 683 to 6210 and flanged F6xx623 in the Ø10 pocketConnects to
Crank discs for a Ø5 shaft, 10 to 30 mm strokecon-rod on one Ø3 end
Rod clevises for a Ø2 or Ø3 rod or a Ø5 tube, 5…rod clevis on the other endAlso needed
Dowel pins, 2–6 mmØ3 pinsIn these build lists
Tri-clamp tee diaphragm gamma, 2 inA tea-light gamma in 2 in tri-clamp: displacer in a 3 in spool, a short-outlet t…You might also need
Questions
What is a beam-driven Stirling engine?
The crank drives a rocker beam whose far end moves the displacer, so the crank can sit beside the cylinder.
What bearing goes in the rocker beam?
A 623 (3 × 10 × 4) in the centre pocket, on the pivot post's Ø3 pin.