Tri-clamp displacer: Ø33.6, Ø46 and Ø70.9 for 1.5, 2 and 3 in spools

sizes

9 in table

Notes

• The displacer is a closed cylinder that runs in the spool bore with a designed radial gap: 0.6 mm in the 1.5 in spool (Ø33.6 in Ø34.8), 0.75 mm in the 2 in (Ø46.0 in Ø47.5), 1.0 mm in the 3 in (Ø70.9 in Ø72.9). The gap is part of the design and is drawn as is.
• Lengths: 1.5 in 50 / 75 / 100, 2 in 60 / 90 / 120, 3 in 80 / 120 / 160 mm. Each length comes two ways: a hollow shell (1 mm wall, closed rounded end, 1.2 mm internal rings every 25 mm) with its end cap, and a solid body of the same diameter and length with a Ø3 centre hole and two 0.6 mm slots crossing on the axis through the full length, so the file is four quarter-segments around the centre hole.
• The shell's end cap has a spigot Ø(D − 2) × 3 that enters the shell, a Ø D × 1.5 flange, and a Ø16 × 6 boss with the Ø3 rod hole and a Ø2.5 radial hole for an M3 grub at 8 mm; the cap stands 10.5 mm overall. One cap file per spool size serves every length.
• The Ø3 rod is the displacer rod: it leaves through the displacer head or crank head on the cold end. Every hole that meets another part is in the Mating features table.

Sizes

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.

Where the files are

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

Long Earth Society	Tri-clamp Stirling engine builds	web, video	LES site
James R. Senft	An Introduction to Low Temperature Differential Stirling Engines (displacer and gap design)	book	Moriya Press verify
Wikipedia	Stirling engine	web	CC BY-SA 4.0 (text)

Free files

★ Free files 27 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

Plain text: sheet.txt · JSON: /api/geometry?object=tri-clamp-displacer