What patent document is this drawing from?

It is from British Complete Specification No. 988378, and this sheet is a reproduction of the original drawing on a reduced scale (2 sheets, Sheets 1 & 2).

What does FIG. 2 show?

FIG. 2 shows a schematic engine cylinder with piston and crank, marked with volumes v, V_C, and V_E, reference numerals 28 and 18, plus a crank-circle timing diagram with points A through E.

What timing events are labeled on the crank circle?

The labeled events are 'INLET PORT OPENS', 'EX VALVE OPENS', 'INLET PORT CLOSES', and 'EXHAUST PORT CLOSES', positioned around crank points A, B, C, D, and E.

What reference numerals appear on the cylinder drawing?

Numeral 28 marks the duct at the top of the cylinder and numeral 18 marks a port in the cylinder wall.

Does this document identify a specific vehicle or engine model?

No. The sheet identifies only patent number 988378 and shows a generic engine schematic; no vehicle year, make, or model is stated.

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GB Patent 988378 Fig. 2 - Hyper-Expansion Engine Valve & Port Timing Diagram

Patent figure Fig. 2 cylinder dimension and port-timing diagram from a complete specification

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Patent drawing Fig. 2 with cylinder volume dimensions and a port-timing circular diagram.

AI caption January 2014 · Photo 422 of 465

This is a scanned sheet from British Complete Specification (patent) No. 988378, labeled as a reproduction of the original drawing on a reduced scale (2 sheets, Sheets 1 & 2). The page shows FIG. 2, a schematic diagram of an engine cylinder with piston, connecting rod, and crank throw. Reference numeral 28 marks a curved intake/exhaust duct at the cylinder head, and numeral 18 marks a port entering the cylinder wall partway down the bore. Dimensional annotations mark volumes v, V_C, and V_E along the cylinder length, indicating clearance and expansion volumes relevant to a hyper-expansion (unequal compression/expansion stroke) engine concept. Superimposed on the crank circle is a valve/port timing diagram with crank positions labeled A (top), B, C, D, and E, with radial lines annotated: 'INLET PORT OPENS' (toward B), 'EX VALVE OPENS' (toward C), 'INLET PORT CLOSES' (toward D), and 'EXHAUST PORT CLOSES' (toward E). An arrow on the right shows the direction of crankshaft rotation. A reader can learn the geometric relationship between port/valve timing events around the crank circle and the associated cylinder volumes used in this over-expanded engine cycle design.

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Frequently asked questions

What patent document is this drawing from?: It is from British Complete Specification No. 988378, and this sheet is a reproduction of the original drawing on a reduced scale (2 sheets, Sheets 1 & 2).
What does FIG. 2 show?: FIG. 2 shows a schematic engine cylinder with piston and crank, marked with volumes v, V_C, and V_E, reference numerals 28 and 18, plus a crank-circle timing diagram with points A through E.
What timing events are labeled on the crank circle?: The labeled events are 'INLET PORT OPENS', 'EX VALVE OPENS', 'INLET PORT CLOSES', and 'EXHAUST PORT CLOSES', positioned around crank points A, B, C, D, and E.
What reference numerals appear on the cylinder drawing?: Numeral 28 marks the duct at the top of the cylinder and numeral 18 marks a port in the cylinder wall.
Does this document identify a specific vehicle or engine model?: No. The sheet identifies only patent number 988378 and shows a generic engine schematic; no vehicle year, make, or model is stated.