DE102010025050A1 - Internal combustion engine, has opening extended along connection between expansion spaces of cylinders at end of compression stroke of one of cylinders, where cylinder is provided for operation of two cycles - Google Patents

Abstract

The engine has a cylinder (2) whose piston (4) synchronously moves with respect to turning points of a piston of another cylinder (1). An opening is extended along connection between expansion spaces of the cylinders at an end of a compression stroke of the latter cylinder. The latter cylinder is provided for operation of two cycles. The latter cylinder is compressed if fuel containing air is charged from crankcase chambers (13, 14) of the cylinders. Maximum boost pressure of the cylinders is varied within the crankcase chambers.

Description

The invention relates to an internal combustion engine having a first cylinder, a second cylinder whose piston moves approximately synchronously with the piston of the first cylinder relative to the reversal points of its movement, and an overflow connection between the expansion chambers of the cylinders which opens at the end of a compression stroke of the first cylinder.

Internal combustion engines with these features go out of the US 4,503,816 as well as the WO 2008/101495 out. By increasing the expansion volume when switching on the second cylinder, a higher proportion of the heat generated in the fuel combustion can be converted into mechanical work and thus save fuel.

The invention provides a new internal combustion engine with the features mentioned in the introduction, which is characterized in that the first cylinder is provided for operation in two cycles.

Preferably, the first cylinder with compressed, possibly containing fuel air from the crankcase chambers of both cylinders can be charged.

Suitably, a third cylinder is provided and between the first and third cylinder, a further, at the end of the compression stroke of the first cylinder opening overflow connection is formed.

Advantageously, the first cylinder can then be further charged with possibly containing air-containing air from a crankcase chamber of the third cylinder.

The interiors of the crankcase chambers may be connected to each other and possibly merge into each other without a partition.

Conveniently, in the existing partition wall, the crankcase chamber of the first cylinder gradually connected to the crankcase chambers of the other cylinder.

In a further embodiment of the invention, the boost pressure in the crankshaft chambers of the cylinder can vary, with such a variation z. B. by an intake valve with variable flow cross section is feasible.

The invention will be explained below with reference to embodiments and the accompanying, relating to one of these embodiments drawings. Show it:

1 an internal combustion engine according to the invention in a sectional partial view, and

2 a detailed view of the internal combustion engine of 1 ,

An internal combustion engine comprises a first cylinder 1 , a second cylinder 2 and a third cylinder 3 , The cylinders 1 to 3 are in a row with the first cylinder 1 arranged in the middle. piston 4 the cylinder 1 to 3 are in drive connection with a crankshaft 5 in a crankcase 6 , Based on their top and bottom dead center all three pistons run 4 synchronous with each other.

The first cylinder 1 is provided with an ignition device (not shown).

Each of the cylinders 1 to 3 each has an inlet valve 7 and an exhaust valve 8th on. Both between the first and second and the first and third cylinder is ever an overflow connection 9 respectively. 9 ' with a valve spool 10 , The valves 7 . 8th and the valve spool 10 the overflow connection 9 be through a camshaft 11 actuated.

As the figures show, the residual volume of the expansion spaces of the outer cylinders 2 and 3 at top dead center of the pistons 4 relative to the relevant residual volume of the middle cylinder 1 reduced.

The crankshaft housing 6 has two partitions 12 to form three each one of the cylinders 1 to 3 associated crankshaft chambers 13 to 15 on. Each of the crankshaft chambers 13 to 15 is with an inlet valve 16 provided for possibly containing combustion air combustion air.

Between the crankshaft chamber 13 and the crankshaft chamber 15 runs a connection channel 17 with a valve 18 , between the crankshaft chamber 15 and the crankshaft chamber 14 a connection channel 19 with a valve 20 ,

From the crankshaft chamber 14 of the cylinder 1 is also a connection channel 21 to the intake valves 7 the cylinder 1 to 3 educated.

In operation of the internal combustion engine described above, the first cylinder operates 1 in two bars. In each case the first stroke are both the respective inlet valve at the onset of piston stroke 7 as well as the exhaust valve 8th of the cylinder 1 open. The exhaust valves 8th the cylinder 2 and 3 are also open, their inlet valves 7 closed.

Via the connection channel 21 flows out of the crankshaft chamber 14 of the cylinder 1 compressed, possibly fuel-containing air through the inlet valve 7 of the cylinder 1 through into the expansion space of the cylinder 1 one. In this after the previous power stroke still contained combustion gases are through the open exhaust valve 8th of the cylinder 1 rinsed through. On the way of the piston 4 of the cylinder 1 to the top dead center first closes the exhaust valve 8th and then the inlet valve 7 of the cylinder 1 , Contained, possibly fuel-containing air is further compressed until the piston 4 of the cylinder 1 reached the top dead center. In the vicinity of the top dead center ignition takes place via not shown ignition means, possibly after a fuel injection.

On the way the pistons 4 the cylinder 2 and 3 the top dead center is the inlet valve 7 of the cylinder 2 and the cylinder 3 If necessary, it opens briefly and in this case it flows temporarily into the respective cylinder under pressure, which ensures a rinsing out of residual gases. The exhaust valves 8th the cylinder 2 and 3 are closed at the latest at top dead center. Thereafter, by actuation of the valve slide 10 both overflow connections 9 . 9 ' opened, and it flows, as in 2 shown, ignited combustion gas via the overflow 9 . 9 ' both in the cylinder 2 as well as in the cylinder 3 , In the second stroke of the downward movement of the piston, the hot gases expand in all three cylinders, wherein heat energy contained therein is converted to a large proportion in mechanical work.

The cylinder 1 receives fresh air or a fuel air mixture from the crankshaft chamber 14 , If necessary, via a motor control device, the valve 20 operated and over the connection channel 19 In addition, possibly containing fuel containing air from the crankshaft chamber 15 in the crankshaft chamber 14 , so that there the pressure drop due to outflow of air through the connecting channel 21 counteracted.

The crankshaft chamber can also be stepped in stages 13 over the connection channel 17 and the valve 18 be switchable. Also possible would be a direct, provided with a valve connection between the crankshaft chamber 14 and the crankshaft chamber 13 , The crankshaft chambers 13 to 15 could also be permanently in fluid communication with each other.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 4503816 [0002]
• WO 2008/101495 [0002]

Claims (7)

Internal combustion engine with a first cylinder ( 1 ), a second cylinder ( 2 ), whose piston ( 4 ) relative to the reversal points of its movement approximately synchronously with the piston ( 4 ) of the first cylinder ( 1 ), and one at the end of a compression stroke of the first cylinder ( 1 ) opening overflow connection ( 9 ) between the expansion spaces of the cylinders ( 1 . 2 ), characterized in that the first cylinder ( 1 ) is provided for operation in two cycles. Internal combustion engine according to claim 1, characterized in that the first cylinder ( 1 ) with compressed, optionally fuel-containing air from crankcase chambers ( 13 . 14 ) of both cylinders ( 1 . 2 ) is rechargeable. Internal combustion engine according to claim 1 or 2, characterized in that a third cylinder ( 3 ) and between the first cylinder ( 1 ) and the third cylinder ( 3 ) another, at the end of the compression stroke of the first cylinder ( 1 ) opening overflow connection ( 9 ) is provided. Internal combustion engine according to claim 3, characterized in that the first cylinder ( 1 ) further with possibly containing fuel-containing air from a crankshaft chamber ( 15 ) of the third cylinder ( 3 ) is rechargeable. Internal combustion engine according to one of claims 1 to 4, characterized in that the maximum boost pressure in the crankshaft chambers ( 13 to 15 ) the cylinder ( 1 to 3 ) is variable. Internal combustion engine according to claim 5, characterized in that the boost pressure through an intake valve ( 16 ) is variable with variable flow cross section. Internal combustion engine according to one of claims 1 to 6, characterized in that the crankshaft chamber ( 14 ) of the first cylinder ( 1 ) gradually with crankshaft chambers ( 13 . 15 ) another cylinder ( 2 . 3 ) is connectable.

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