JPH0768916B2 - engine - Google Patents

Description

TECHNICAL FIELD The present invention relates to an engine that converts thermal energy into rotational output.

[Prior Art] As is well known, reciprocating engines and Wankel type rotary engines are well known as representatives of engines that are currently in practical use (for example, J. Shajet et al., Translated by Yasuo Ohno. Automotive Engineering Engine, Showa 44
October 25, published by Sankaido Co., Ltd., page 91).

[Problems to be Solved by the Invention] However, in the above-mentioned reciprocating engine, combustion is performed once for every two revolutions of the crankshaft in the case of a four-cycle engine, and once per revolution of the crankshaft even for a two-cycle engine. Therefore, it is necessary to increase the number of cylinders to obtain high output, and the height of the engine is restricted by the sum of the stroke of the piston and the crank amount of the crankshaft, which increases the size of the entire engine. On the other hand, in the above Wankel type rotary engine, since the contact between the rotary piston (rotor) and the cylinder peripheral surface is a line contact, it is well known that the sealing at this contact part is difficult and airtight. However, there is a problem in that the shape of the combustion chamber is poor, the mixed gas is difficult to burn, and the combustion efficiency is poor.

Therefore, the present invention provides an engine which can be made small in size and large in output by causing combustion once every half rotation of the crankshaft and which does not cause the above-mentioned problems of deterioration of airtightness and combustion efficiency. It is intended to solve the problems of the prior art.

[Means for Solving the Problem] That is, according to the present invention, a piston capable of swinging about a central support shaft is provided in a cylindrical engine block in a symmetrical position opposite to a boss fitted to the support shaft. The crank pin of the crankshaft, which is supported by the crank chamber that is connected to the engine block, is connected to the swing piston via the connecting rod to allow the swing piston to swing 90 degrees. An engine characterized in that two combustion chambers formed between the oscillating piston and the engine block are provided at two locations in a fan shape of 90 degrees symmetrically with respect to a line connecting the support shaft and the crank shaft. To do.

[Operation] In such an engine, when the relationship between the crankshaft and the oscillating piston is near the top dead center, combustion of the mixed gas in one combustion chamber causes the oscillating piston on the combustion chamber side. Is pressed to swing in one direction around the spindle, and the crankshaft is half-turned through the connecting rod to bring the swinging piston near the bottom dead center on the combustion chamber side. At this time, on the other combustion chamber side, the oscillating piston has reached the vicinity of top dead center, so that the mixed gas is burned, and the oscillating piston is pushed on the combustion chamber side in the opposite direction to the center of the spindle. The oscillating piston is oscillated, and the crankshaft is made to make a half rotation in the above direction. Thus, the combustion of the mixed gas is alternately performed in both combustion chambers at every half rotation of the crankshaft, and the crankshaft is made to rotate. Rotate.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 is an engine block, 2 is a horizontal support shaft arranged in the center of the engine block 1, and both ends of the support shaft 2 are supported by side wall parts of the engine block 1. Reference numeral 3 denotes a swinging piston housed in the cylinder block 1, which has pistons 5a and 5b projecting from the boss 4 at substantially symmetrical positions.
The boss 4 is rotatably supported on the support shaft 2. In this case, there is no problem even if the support shaft 2 and the boss 4 are fixed so that the support shaft 2 can rotate on the engine block 1.

Reference numeral 6 denotes a crankshaft which is supported by the engine block 1 in parallel with the support shaft 2, and is supported by a crank chamber which is connected to and communicates with the engine block 1, and a crankpin 7 of the crankshaft 6 is supported.
Is connected to a pin 9 provided on the back of the swing piston 3 via a connecting rod 8, and when the crankshaft 6 rotates, the swing piston 3 can swing in the engine block 1 about the support shaft 2 in an arc shape. There is. Reference numerals 10a and 10b are cylinder heads of the engine block 1 provided on the front sides of the swing pistons 5a and 5b, respectively, and are spark plugs.
An intake manifold 13 including an intake valve 12 is provided, and the intake manifold 13 is connected to the outlet side of the air pump 14, and the inlet side of the air pump 14 is connected to the air cleaner 15. The intake manifold 13 is provided with a fuel injector 16. A camshaft 17 for operating the intake valves 12, 12 is drivingly connected to the crankshaft 6 via a timing belt 18, and a drive belt 19 for driving the air pump 14. Is drivingly connected to the crankshaft 6.

Then, 90-degree fan-shaped combustion chambers 20a, 20b are formed in the spaces between the cylinder heads 10a, 10b and the pistons 5a, 5b opposed to the oscillating piston, and these combustion chambers 20a, 20b are formed by the spindle 2
Is symmetrical with respect to the line connecting the
When the pistons 5a, 5b swing to the crankshaft 6 side, the exhaust ports 21, 21 communicating with the combustion chambers 20a, 20b are connected to the engine block 1
It is opened in. Reference numeral 22 is a flywheel provided on the crankshaft 6, 23 is a starter motor for driving the flywheel 22, and 24 is a sealing material provided on the pistons 5a and 5b.

In the engine of this example as described above, as shown in FIG. 1, when the relationship between the swinging piston 3, the connecting rod 8 and the crankshaft 6 is near the top dead center, one combustion chamber 20a Ignition combustion of the mixed gas by the ignition plug 11 is performed, at this time, the intake valve 12 is opened on the other combustion chamber 20b side, the mixture gas is supplied from the intake manifold 13, and the exhaust gas is scavenged to the exhaust port 21. ing.

The combustion stroke pushes the piston 5a of the rocking piston to rock the rocking piston 3 around the support shaft 2 in the clockwise direction in the figure, thereby rotating the crankshaft 6 via the connecting rod 8 (see FIG. 3). ). At this time, the intake valve 12 is closed in the other combustion chamber 20b, and
5b is the compression stroke of the air-fuel mixture.

When the oscillating piston 3 passes through the exhaust port 21, the exhaust gas of the combustion chamber 20a exits from the exhaust port 21, and at the same time the intake valve 12 opens, and the air-fuel mixture from the intake manifold 13 starts the scavenging of the combustion chamber 20a and the crank. Axis 6,
The relationship of the oscillating piston 3 is near the bottom dead center (see FIG. 4). At this time, the air-fuel mixture in the combustion chamber 20b is compressed by the oscillating piston 3 and the combustion chamber 20a side is in a depressurized state. At this time, ignition combustion by the spark plug 11 on the corresponding side is performed in the combustion chamber 20b. Be seen.

The combustion stroke pushes the piston 5b of the rocking piston to rock the rocking piston 3 around the support shaft 2 in the counterclockwise direction in the figure, thereby rotating the crankshaft 6 in the same direction as described above via the connecting rod 8. (See FIG. 5). At this time, the intake valve 12 is closed on the other combustion chamber 20a side, and the rocking piston 3 is in the compression stroke of the air-fuel mixture.

Then, the swing piston 3 passes through the exhaust port 21, and the combustion chamber 20
At the same time as the exhaust gas of b exits from the exhaust port 21, the intake valve 12 opens, the scavenging of the combustion chamber 20b starts due to the air-fuel mixture, and the relationship between the crankshaft 6 and the oscillating piston 3 is near top dead center. Returning to FIG. 1 (see FIG. 1), and thereafter, by repeating the same stroke, the swing piston 3 swings, and a rotation output is obtained on the crankshaft 6.

Needless to say, when the engine is started, the flywheel 22 and the crankshaft 6 are rotated by the operation of the starter motor 23 to perform the above stroke.

Further, in the above example, the case where the air-fuel mixture is supplied by the air pumps 14, 14 is shown, but it is also possible to use other air-fuel mixture supply means known in a normal two-cycle engine or the like. Further, the same means as in a normal engine is used for lubrication and cooling of the engine.

[Advantages of the Invention] As described above, in the engine of the present invention, combustion can be performed once for each counter rotation of the crankshaft to oscillate the oscillating piston to extract rotational output to the crankshaft.
Efficient combustion by swinging the piston by 90 degrees in a 90-degree fan-shaped combustion chamber, thus enabling a small and large output, and unlike the Wankel type rotary engine, the swinging piston has a simple arc centered on the spindle. Since the exercise is performed, it is unlikely that airtightness and combustion efficiency will decrease.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a right sectional view, Fig. 2 is a reduced oblique view, and Figs. 3 to 5 are reduced schematic right sectional views for explaining a stroke. It is a figure. 1 ... Engine block, 2 ... Support shaft, 3 ... Oscillating piston, 6 ... Crank shaft, 8 ... Connecting rod,
20a, 20b ... Combustion chamber

Claims (1)

[Claims] 1. An engine block comprising a swinging piston formed in a cylindrical engine block, wherein a swingable piston about a central support shaft is provided in a symmetrical position to a boss fitted to the support shaft. The crank pin of the crank shaft supported in the crank chamber that is continuously connected to is connected to the swing piston via the connecting rod to allow the swing piston to swing 90 degrees, and between the piston and the engine block. The combustion chamber to be formed is symmetrical with respect to the line connecting the support shaft and the crank shaft.
An engine that features two 90-degree fan-shaped parts.