US636298A - Explosion-engine. - Google Patents

Description

No. 636,298. Paten td Nov. 7,1899.

F. H. SMITH.

EXPLOSION ENGINE.

(Application filed July 81, 1899.)

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. 7 @MW QMLULW m m UNITED STATES ATENT union.

FREDERICK HUGH SMITH, OF DUMBLANE, SCOTLAND.

EXPLOSION-ENGINE.

SPECIFICATION forming part of Letters Patent No. 636,298, dated November '7, 1899. Application filed July 31,1899. Serial No. 725,567. (No model.)

To all whom it may concern:

Be it known that LFREDERIOK HUGH SMITH, engineer, a subject of the Queen of Great Britain, residing at The Limes, Dumblane, Scotland, have invented certain new and useful Improvements in Explosion-Engines, of which the following is a specification.

This invention relates to two-stroke cycleengines having a supplementary piston to expel the products of combustion. I provide a spring tending to force the supplementary piston toward the inner end of the cylinder and provide a non-return valve preferably in the supplementary piston.

Figure 1 is a longitudinal section of an engine constructed according to this invention. Fig. 2 shows a modification.

a is the cylinder, and b is the main piston in it.

'c is the connecting-rod, pivoted to the piston b and the crank 01 on the crank-shaft e.

f is a cam fixed to the crank-shaft e and operating the exhaust-valve g through the lever h, pivoted at j.

k is the admission pipe and port, supplying an explosive mixture of air and gas or vapor.

Z is a valve which is preferably provided on I the pipe 76.

m is the supplementary piston, having a non-return valve n in it, which is normally held onto its seat by the spring 0.

p is a spring interposed between the pistons Z) and m and tending to separate them, as shown in Fig. 1, or it may be placed outside the cylinder, as shown in Fig. 2.

q is the ignition apparatus of any ordinary construction.

The working of the engine is as follows: On the explosion taking place the two pistons 12 and m are forced out together; but on opening the exhaust-valve g at the inner end of the cylinder the pressure is reduced, and the spring 19 causes the return of the supplementary piston on before the other, so expelling the products of combustion. Meanwhile the main piston 12 has uncovered the inlet-passage 70 in the outer end of the cylinder, and a charge is admitted into the space between the pistons. The return of the main piston b compresses this charge and forces it through the valve 12 in the supplementary piston m into the combustion-chamber.

One great advantage gained by this engine is that it is more or less self-governing, for after the exhaust is opened the spring 19 takes a definite time to carry the piston m back to the inner end of the cylinder, and if the engine is running too fast for the piston m to complete its travel before the exhaust is closed then the products of combustion are not completely expelled and only a partial charge of the explosive mixture is drawn in, and therefore the faster the engine is running the smaller and more diluted are the charges supplied to it.

The speed of the engine can be regulated either by adjusting the spring 1) or by turning the cock Z.

I claim- 1. The combination of a cylinder, a main piston, a supplementary piston, asprin g tending to force the supplementary piston to the inner end of the cylinder, an inlet at the outer end of the cylinder, an exhaust-valve at the inner end of the cylinder, means for operating it, a passage connecting the space between the pistons and the inner end of the cylinder, and a non-return valve in the passage.

2. The combination of a cylinder, a main piston, a supplementary piston, a spring tending to force the supplementary piston to the inner end of the cylinder, an inlet at the outer end of the cylinder, an exhaust-valve at the inner end of the cylinder, means for operating it, a passage through the supplementary piston, and a non-return valve in the passage.

3. The combination of a cylinder, a main piston, a supplementary piston, a spring between the pistons, an inlet at the outer end of the cylinder, an exhaust-valve at the inner end of the cylinder, means for operating it, a passage connecting the space between the pistons and the inner end of the cylinder, and a non-return valve in the passage.

4. The combination of a cylinder, a main piston, a supplementary piston, a spring between the pistons, an inlet at, the outer end of the .cylinder, an exhaust-valvetat the inner end of the cylinder, means for operating it, a passage through the supplementary piston, and a non-return valve in the passage.

5. The combination of a cylinder, a main piston, a supplementary piston, a spring tending to force the supplementary piston to the inner end of the cylinder, an inlet at the outer end of the cylinder, a cock on the inlet, an exhaust-valve at the inner end of the cylinder, means for operating it, a passage connecting the space between the pistons and the inner end of the cylinder, and a non-return valve in the passage.

6. The combination of a cylinder, a main the cylinder, a cock on the inlet, an exhaustvalve at the inner end of the cylinder, means for operating it, a passage connecting the space between the pistons and the inner end of the cylinder, and a non-return valve in the passage.

8. The combination of a cylinder, a main piston, a supplementary piston, a spring between the pistons, an inlet at the outer end of the cylinder, a cook on the inlet, an eX- haust-valve at the inner end of the cylinder, means for operating it, a passage through the supplementary piston, and a non-return valve in the passage.

FREDERICK HUGH SMITH.

Witnesses:

WILFRED OARPINAEL, FRED O. HARRIS.

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