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Crankcase insert for a 2 in tri-clamp cross: displacer-rod guide, crank chamber and run filler

Name: Crankcase insert for a 2 in tri-clamp cross: displacer-rod guide, crank chamber and run filler dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

How do I guide a displacer rod and fill the dead volume inside a 2 inch tri-clamp cross? · Hardware · basis: ASME BPE 2 in bore Ø47.5; ISO 2852 Type B lip (Ø45.3, 2.8 from the joint plane); slot, chamber and gap sizes are design values from the crank and con-rods

Long Earth Society build part. The insert that turns the cross into my crankcase. 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: 6 in table

Notes

One piece that fills the run of a 2 in cross with the working gas still free to move. It drops in from the top, stands on the lower gasket's lip and passes the lip with a Ø45.3 spigot that ends level with the lip's lower face.
Lower run: a Ø3 bore 31.55 mm long is the displacer-rod guide (running fit). Above it a column for the displacer's rod clevis and a slab for its con-rod; two Ø8 passages carry the gas from under the insert to the crank chamber; a Ø18 pocket at the bottom takes the displacer cap's boss at the top of its stroke.
Middle: a Ø29 chamber straight through along the branch axis; the two branch plugs' noses fill its ends up to the crank. Upper run: slab and column for the diaphragm con-rod and clevis, a Ø22 pocket for the centre disc and nuts, and a cone that stays 1 mm under the membrane at full inward travel.
Fits: Ø47.5 slide in the bore; spigot touches the lip's Ø45.3; Ø3 guide run on the rod. Chamber, slots and the gap under the membrane are designed.

Sizes

feature	value
outside	Ø47.5, -86.95 to 88.25 from the cross centre
spigot	Ø45.3 to -92.55
guide	Ø3 × 31.55
crank chamber	Ø29 along X
gas passages	2 × Ø8
gap under the membrane	1 at ±6 travel

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
outside	Ø47.5	2 in cross run bore	slide	all
spigot	Ø45.3	Type B gasket lip (ID 45.3)	slide	all
displacer-rod guide	Ø3 × 31.55	Ø3 displacer rod (crankshaft-3x60): runs in it	run	all
crank chamber	Ø29 along the branch axis	branch-plug noses; crank sweep R 13	designed	all
con-rod slabs and clevis columns	7 × 18 and 9 × 18 slabs, 13 × 11 boxes, Ø12 round columns	con-rods and rod clevises in motion	designed	all
membrane cone	1.0 under the membrane at ±6 travel; Ø22 disc pocket	centre disc, nuts and boss at full inward travel	designed	all
gas passages	2 × Ø8	gas path from the displacer to the crank chamber	designed	all

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	PDF	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

crankcase-insert-2in

2 in cross crankcase insert: Ø47.5 from the lower lip (-86.95) to the rim (88.25), Ø45.3 spigot to -92.55 (from the cross centre); Ø29 crank chamber along the branches; Ø3 guide 31.55 long; two Ø8 gas passages; membrane cone 1 under full inward travel

STEP · STL

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