JP4431245B2 - Internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an internal combustion engine used for motorcycles, automobiles, small ships, and the like.
[0002]
[Prior art]
Most engines such as automobiles are of reciprocating piston type, but this type of vibration is inherently high in vibration, and a lot of cost is required for vibration countermeasures such as increasing the number of cylinders. On the other hand, there is a rotary piston type engine, which has less vibration, but has a drawback that the seal between the piston and the cylinder is easily broken.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to provide a piston-type internal combustion engine that has less vibration and a simple seal structure.
[0004]
[Means for Solving the Problems]
The engine according to the present invention rotatably supports at least a pair of opposed cylinders around a hollow fixed shaft, and a piston is reciprocally fitted inside each cylinder. A support shaft is supported at a position eccentric with respect to the hollow fixed shaft, and one end of the piston rod is rotatably supported on this shaft, and the tip of the piston rod is coupled to the piston via a piston pin. Therefore, when the cylinder rotates around the hollow fixed shaft, the piston in the cylinder also rotates together with the cylinder. However, since one end of the piston rod is supported by a support shaft that is eccentric from the hollow fixed shaft, the piston is Reciprocates inside. Therefore, if a mixed gas of air and fuel is introduced into the cylinder in the process of increasing the cylinder volume, and this is compressed sufficiently and ignited and burned, and the exhaust gas generated is discharged, it will rotate continuously, Rotational energy can be extracted.
[0005]
This is characterized in that both the cylinder and the piston rotate about their own axes, so that there is less vibration than conventional reciprocating engines. When the cylinders are arranged so as to face each other with the hollow rotating shaft interposed therebetween, vibrations are particularly reduced because the piston moves in the opposite direction. Therefore, the number of cylinders is preferably 2 or a multiple thereof. This engine can be operated in either a 2-stroke cycle or a 4-stroke cycle.
[0006]
In order to supply / exhaust the cylinder, an air supply pipe 27 and an exhaust pipe 28 are guided from the side of each cylinder so that the tip is in sliding contact with the hollow fixed shaft. An air supply port 35 is formed in the hollow fixed shaft 10 so that the air supply pipe 27 communicates with an air supply passage 38 formed in the hollow fixed shaft. Similarly, an exhaust port 36 is formed in the hollow fixed shaft 10 so that the exhaust pipe 28 communicates with an exhaust passage 39 formed in the hollow fixed shaft. In this way, the cylinder can be supplied and exhausted from the hollow fixed shaft, and there is no need to provide a movable valve in the cylinder. Therefore, the structure is simple and maintenance is easy.
[0007]
If a blower impeller that rotates together with the piston rod is provided around the support shaft and the supply air is pushed into the cylinder by the impeller, it is possible to prevent the exhaust gas from flowing backward from the cylinder.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIGS. 1 and 2, a cylinder block 11 is rotatably supported around a hollow fixed shaft 10. Reference numeral 12 denotes a roller bearing that supports the cylinder block. The cylinder block 11 includes a pair of cylinders 13 facing each other with the hollow fixed shaft 10 interposed therebetween, and a piston 15 is slidably fitted to each cylinder. Each piston pivotally supports the upper end of a piston rod 17 via a pin 16.
[0009]
Two support plates 18 and 19 are fixed at an interval inside the hollow fixed shaft 10, and the support shaft 20 is fixed between the support plates eccentrically with respect to the hollow fixed shaft. An impeller 21 as a blower is rotatably supported on the support shaft, and a lower end of the piston rod 17 is fixed to an outer cylinder 21a of the impeller. Reference numeral 22 denotes a needle bearing that supports the impeller 21.
[0010]
The right support 19 of the two support plates is provided with a suction port 21b and a discharge port 21c of the impeller 21, and a partition wall 23 for separating these two ports is provided inside the hollow fixed shaft 10. An air supply pipe 27 and an exhaust pipe 28 extend from air supply / exhaust ports 25, 26 opened on both sides of each cylinder 13, respectively, and their tips are attached to a ring 30 slidably supported around the hollow fixed shaft 10, 31. On the other hand, an air supply port 35 and an exhaust port 36 that are elongated in the circumferential direction are formed in the hollow fixed shaft 10 where the rings 30 and 31 are in sliding contact with each other. The air supply port 35 is connected to an air supply path 38 connected to the outlet of the impeller 21, and the exhaust port 36 is connected to an exhaust path 39 on the left side of the support plate 18.
[0011]
A fuel vaporizer 40 is provided at the end of the hollow fixed shaft 10. The fuel is a mixture of lubricating oil. A muffler 41 is on the left side of the hollow fixed shaft. Each cylinder 13 is provided with a spark plug 42. The ignition coil 43 is fixed to the cylinder side, and the corresponding magnet 44 is fixed to the hollow fixed shaft side so that current flows through the ignition plug with good timing.
[0012]
A spur gear 46 is fixed to the left ring 31, and a pinion 47 that meshes with the spur gear 46 is attached to the output shaft 48. Reference numeral 50 denotes a starting motor 50, and a pinion 51 attached to the shaft also meshes with the spur gear 46.
[0013]
The operation of this engine will be described. The cylinder block 11 rotates around the hollow fixed shaft 10. The piston rod 17 extending from the piston 15 of each cylinder 13 is supported by a support shaft 20, and the support shaft is eccentric from the hollow fixed shaft. Therefore, when the cylinder block 11 rotates, the piston reciprocates in each cylinder. . In the two cylinders, the piston always moves in the opposite direction. In the drawing, the upper cylinder is at the top dead center where the piston is fully inserted (A state), and the lower cylinder is the bottom dead center where the piston is most removed (C state). In FIG. 2, the middle of the process from A to C is shown as the B state, and the middle of the process from C to A is shown as the D state.
[0014]
In the A state (top dead center), the air-fuel mixture in the cylinder 13 compressed in the previous compression stroke is ignited by the spark plug 42. The mixed gas burns and expands explosively, and the cylinder rotates toward B and further toward C while pushing down the piston 15. When the cylinder approaches the C state, the piston comes out and the cylinder air supply and exhaust ports 25 and 26 open. Further, the pipe end of the air supply pipe 27 rides on the air supply port 35 of the hollow fixed shaft 10, and the air supply path 38 in the cylinder and the hollow fixed shaft communicate with each other through the air supply pipe 27. When this happens, the mixture of vaporized fuel and air produced by the carburetor 40 is sucked into the impeller 21 from the suction port 21b. The impeller 21 rotates together with the cylinder block 11, and the air-fuel mixture sucked into the impeller increases in momentum and is sent out from the opposite side. The air-fuel mixture sent out circulates outside the impeller and reaches the air supply path 38, from here through the air supply port 35 bored in the hollow fixed shaft 10 and into the air supply pipe 27, It is sucked in.
[0015]
Further, with a slight delay, the pipe end of the exhaust pipe 28 rides on the exhaust port 36 of the hollow fixed shaft, and the exhaust passage 39 communicates with the inside of the cylinder and the hollow fixed shaft through the exhaust pipe 28. Since the cylinder volume gradually decreases, the exhaust gas in the cylinder is pushed out, enters the exhaust passage 39 in the hollow fixed shaft through the exhaust pipe 28, and is discharged to the outside through the muffler 41.
[0016]
Thus, the exhaust gas is replaced with the air-fuel mixture in the cylinder, and the engine enters the compression stroke and is ignited in the A state after passing the D state. In this way, the engine rotates continuously, and its output is taken from the output shaft 48.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an engine.
FIG. 2 is a cross-sectional view showing the operation of the engine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Hollow fixed shaft 13 Cylinder 15 Piston 16 Piston pin 17 Piston rod 20 Support shaft 21 Impeller 27 as an air blower 27 Supply pipe 28 Exhaust pipe 35 Supply port 36 Exhaust port 38 Supply path 39 Exhaust path

Claims (2)

A hollow fixed shaft, at least a pair of cylinders that are rotatably supported around the hollow fixed shaft, and that face each other with the hollow fixed shaft interposed therebetween; A support shaft supported by the hollow fixed shaft and eccentric with respect to the hollow fixed shaft; a piston rod having one end rotatably supported around the support shaft; and a piston connecting the piston rod and the piston An internal combustion engine comprising a pin and a blowing impeller provided around the support shaft and rotating together with the piston rod .   Further, an air supply pipe led from the side of the cylinder and having a tip slidably contacting the hollow fixed shaft, and an exhaust pipe led from the side of the cylinder and having a tip slidably contacting the hollow fixed shaft, and the hollow An air supply port formed in the hollow fixed shaft, an air supply port formed in the hollow fixed shaft, and an exhaust pipe communicate with the air supply passage formed in the fixed shaft. The internal combustion engine according to claim 1, further comprising an exhaust port formed in the hollow fixed shaft.

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