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Tri-clamp bearing cap: 2 in cap with a long Ø3 shaft bore and two 623 seats
How do I bring a crankshaft out of a sealed tri-clamp crankcase? · Hardware · basis: ISO 2852 clamp face and 20° back exactly as the flat end cap on this site (gen_hardware.tc_cap); 623 bearing 3 × 10 × 4 (ISO 15); bore length and spigot are design values
Long Earth Society build part. The cap my cross gamma's crankshaft leaves through. 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
- 5 in table
Notes
- A cap for a 2 in ferrule face that lets a thin crankshaft out of a crankcase that holds working gas. The face, the 1.6 mm recess and the 20° back cone are the flat end cap's, so the standard clamp and Type B gasket close it like any cap.
- On the gas side a Ø16 spigot runs 77.1 mm in from the face: through the gasket lip and through the Ø16 bore of the branch plug to the crank chamber. A 623 seat (Ø10 × 4) at the spigot end carries the shaft next to the crank; a second 623 seat in the back carries it next to the flywheel.
- Between the two seats the shaft runs in a Ø3 bore 75.1 mm long. That close running fit is the only way out for the gas: no seal, no O-ring, so almost no friction.
- Fits: Ø3 bore run on the Ø3 shaft; seats press on the 623 outer ring; spigot slide in the plug bore; the face is a clamp face.
Sizes
| feature | value |
|---|---|
| face | ISO 2852, 2 in (Ø64 flange) |
| flat back | Ø46.7 at 6 |
| spigot | Ø16 × 77.1 from the face |
| bearing seats | 2 × Ø10 × 4 (623) |
| shaft bore | Ø3 × 75.1 (run) |
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 |
|---|---|---|---|---|
| cap face | ISO 2852 (land Ø56.5–Ø64, rim 2.85, 1.6 recess, 20° back to the flat back) | standard clamp + Type B gasket | clamp | bearing-cap-* |
| shaft bore | Ø3 × 75.1 between the seats | Ø3 crankshaft (shaft-3x100): the clearance seal, the only leak path | run | bearing-cap-* |
| bearing seats | 2 × Ø10 × 4 (back and spigot end) | 623 outer ring | press | bearing-cap-* |
| spigot | Ø16 × 77.1 from the face | Ø16 bore of branch-plug-2in-bore16 | slide | bearing-cap-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| ISO (via iTeh sample) | ISO 2852 clamp liners: face profile and flange / groove diameters | standard excerpt; dimensions are facts | |
| ASME | BPE Bioprocessing Equipment (clamp fitting dimensions, tube OD and wall) | standard | ASME; dimensions are facts verify |
| Long Earth Society | Engine builds | web, video | LES site |
Free files
★ Free files 1 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| bearing-cap-2in-b3 | 2 in bearing cap: ISO 2852 face (land Ø56.5–Ø64, rim 2.85, recess 1.6 inside Ø56.5), 20° back to the 6 mm flat back (Ø46.7) as the flat end cap; Ø16 spigot 77.1 from the face; 623 seats Ø10 × 4 in the back and at the spigot end; Ø3 bore 75.1 long between them | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=tri-clamp-bearing-cap
How it fits
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Questions
How does the shaft get out without a seal?
Through a Ø3 bore 75.1 mm long between two 623 seats: a long close running fit leaks very little and adds almost no friction.
Does it fit a standard clamp and gasket?
Yes: the face and back are the flat end cap's ISO 2852 profile.