JPH06173701A - Engine power unit - Google Patents

Abstract

PURPOSE:To provide an engine power unit which can obtain high output and realize miniaturization. CONSTITUTION:An engine 10 is a horizontally opposed air cooling type two- cylinder two-cycle engine, and a rotary shaft of a startor coil 18 for starting the engine 10 is provided on the same shaft as the rotary shaft 16 of a propeller, and driving force of the engine 10 is directly actuated on the rotary shaft 16 of the propeller so as to drive the propeller 14 in rotation, in an engine power unit where the propeller 14 is rotated so as to generate thrust by the driving force of the engine 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine power unit.

[0002]

2. Description of the Related Art An engine power unit in which a propeller is rotated by a driving force of an engine to generate thrust is provided so that a person can carry it on his back and is used as power for a motor paraglider or the like. Conventionally, in this type of engine power unit, there is one in which a large propeller having a total length of about 100 cm is rotationally driven by using a single-cylinder air-cooled two-cycle engine. In this unit, a single-cylinder small engine of about 100cc is used to reduce the weight.
A transmission is used to obtain a predetermined torque for rotating the propeller.

[0003]

However, since this engine power unit is a single-cylinder engine, it is difficult to balance the motion when the reciprocating motion of the piston is the rotary motion of the propeller, and the engine vibration is large. Therefore, it has been necessary to strengthen the strength of the frame that supports and fixes the engine. In addition, the transmission was installed, and the frame member that encloses the large propeller was also large for safety. As a result, the unit becomes large and the total weight of the unit becomes about 25 to 30 kg, which is a heavy unit for a person to carry on his back. Also, in order to improve the versatility of the engine power unit, increasing the output by enlarging the single-cylinder engine will increase the vibration, and the weight will increase due to the need to strengthen the frame that supports the engine. There was a limit as a unit that people could carry on their backs.

Therefore, an object of the present invention is to provide an engine power unit which can obtain a high output and can be reduced in size and weight.

[0005]

In order to achieve the above object, the present invention has the following constitution. That is, the present invention is
In an engine power unit in which a propeller is rotated by a driving force of an engine to generate thrust, the engine is a horizontally opposed air-cooled two-cylinder two-cycle engine,
The rotating shaft of the starter coil for starting the engine is provided coaxially with the rotating shaft of the propeller, and the driving force of the engine is directly applied to the rotating shaft of the propeller to rotationally drive the propeller.

[0006]

According to the engine power unit of the present invention, the engine is a horizontally opposed air-cooled two-cylinder two-cycle engine, and the driving force of the engine is directly applied to the rotating shaft of the propeller. Therefore, when the reciprocating motion of the piston is changed to the rotary motion of the propeller, the motion balance is favorably maintained and the vibration is alleviated. Further, even if the engine output is set high, the vibration does not increase, the need for increasing the strength of the frame and the like is small, and the weight can be reduced. In addition, by using two cylinders, the output can be increased and sufficient torque can be obtained. The rotation shaft of the starter coil that starts the engine is provided coaxially with the rotation shaft of the propeller, and the driving force of the engine can be applied to the rotation shaft of the propeller. Since it is directly actuated, no transmission or the like is required. As a result, the unit can be reduced in size and weight.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1A is a plan view showing an embodiment of an engine power unit according to the present invention,
FIG. 1B is a front view thereof. 2 is an explanatory view showing a state in which a person carries the engine power unit of the embodiment shown in FIG. Reference numeral 10 denotes an engine, which is configured as a horizontally opposed air-cooled two-cylinder two-cycle engine as shown in the figure. That is, the engine 10 includes the cylinder unit 1
2 are arranged to face each other horizontally, and the rotary shaft 1 of the propeller 14 is arranged.
Two piston rods facing each other are connected to a crankshaft provided coaxially with 6, and the two-cylinder engine converts reciprocating motions of the two facing pistons into rotary motions of the rotary shaft 16. As a result, the driving force of the engine 10 can be directly applied to the rotating shaft 16 of the propeller 14 to rotate the propeller 14. Therefore, when the reciprocating motion of the piston is changed to the rotary motion of the propeller, the motion balance is favorably maintained and the vibration is alleviated. The engine 10 is basically formed by arranging two engines, which are used in a chainsaw (for cutting wood), in a horizontally opposed manner.

Reference numeral 18 is a starter coil 18 for starting the engine 10, and its rotary shaft is provided coaxially with the rotary shaft 16 of the propeller 14. This starter coil 18
Is generally used for a small engine for agriculture and forestry, and the engine can be started by gripping the starter rope wound around the rotary shaft with the starter grip 19 and pulling. Since the starter coil 18 can be made lighter than other engine starting means, it is suitable for this unit.

Reference numeral 20 denotes an intake device section, which adjusts the amount of passing air and the supply of fuel so that a mixture of air and fuel is supplied into the cylinder. Reference numeral 22 denotes an intake pipe (air horn), which has a trumpet-shaped tip for adjusting the flow of the intake air so that the intake air is appropriately sucked into the cylinder with the intake resistance being suppressed as much as possible. A pipe line having a straight line portion of a predetermined length is formed.

24 is a diaphragm fuel supply device,
By the action of the diaphragm, the fuel can be sucked from the fuel tank 25, and the fuel can be ejected into the intake pipe line continuous with the intake pipe 22. In addition, this diaphragm 24
The operation of is synchronized with the movement of the piston, and is set so that the fuel is suitably ejected in synchronization with the intake stroke of the engine. According to the diaphragm fuel supply device 24, fuel can be forcibly sucked and supplied into the intake pipe line regardless of the posture of the engine power unit. As a result, the engine does not stop even when the posture of the engine power unit changes to various states, and it is suitable even under severe operating conditions such as a motor paraglider. The diaphragm fuel supply device 24 is generally used in a chain saw engine.

Further, the intake device section 20 is provided with a throttle device having a throttle valve for controlling the output of the engine by adjusting the flow rate of air taken into the cylinder. As shown in FIG. 3, this throttle device is operated by an operator carrying an engine power unit operating an accelerator lever 26. A kill switch for stopping the engine is also arranged on the handle provided with the accelerator lever 26. As a result, the operator can easily control the output of the engine power unit and stop the engine. Reference numeral 28 is a spark plug, which is connected to a distributor 30 of the ignition system, and preferably performs spark ignition in synchronization with the movement of the piston. Further, 32 is a muffler for muffling.

The engine 10 having the above structure is fixed to the frame 34 via a vibration-proof rubber that absorbs vibrations. As a result, the frame 34 can be reduced in weight. Of course, it becomes comfortable for the operator who carries the unit on his back. Further, the intake device section 20 is fixed to the frame 34 separately from the engine 10, and the intake port of the engine 10 and the intake device 22 are connected by a rubber tube 36. As a result, the vibration of the engine 10 is not directly transmitted to the intake device unit 20, and the intake device unit 20 is not damaged by the vibration of the engine. Note that 35
Is a frame member, which is fixed to the frame 34 and surrounds the propeller 14 for safety. Furthermore, this frame member 35
For safety, a net as shown in FIG. 1 and FIG.

FIG. 3 is an explanatory view showing the structure of the fuel tank 25. As shown in the drawing, even if the fuel tank 25 is tilted due to the change in the posture of the engine power unit, the fuel 5
The fuel suction port 40 at the tip of the tube 38 for supplying 0 to the diaphragm fuel supply device 24 is provided so as to be always located in the fuel 50. That is, the tube 38 is made of elastic synthetic resin,
A weight 42 is attached to the distal end of the tube 38 so that the tube 8 is curved appropriately. Therefore, regardless of the posture of the engine power unit, the fuel 50 can be suitably sucked from the fuel suction port 40 and can be suitably supplied to the engine 10, and the engine 10 can be prevented from stopping. . In this embodiment, one fuel tank 25 is mounted on one side of the frame 34, but it goes without saying that two fuel tanks 25 may be arranged on both sides of the frame 34. As a result, the continuous operating time of the engine power unit can be extended and the weight balance of the unit can be improved.

According to the embodiment having the above configuration, the engine 1
Since 0 is set to 2 cylinders, the displacement can be set to twice or more that of the conventional one. Further, the propeller can be properly balanced in rotation, and since no speed reducer is used, loss of driving force can be suppressed. Therefore, high output can be efficiently obtained. Furthermore, since the driving force of the engine is directly applied to the rotating shaft of the propeller,
Higher output can be obtained by increasing the number of revolutions of the propeller. As a result, in this embodiment, a high output of 16 horsepower / 7800 rpm can be obtained with a 2-cylinder, air-cooled 2-cycle engine and a displacement of 243 cc.

Since the output can be increased by increasing the number of revolutions, the propeller can be set in a small size.
In this embodiment, a propeller having a total length of 62 cm is used,
It is about 40% smaller than the conventional one. As a result, the entire unit can be downsized and the weight can be reduced. Further, since the vibration of the engine can be suppressed to a small level, it is not necessary to strengthen the strength of the frame, and the unit can be made smaller and lighter. From the above effects, in this embodiment,
The overall weight can be reduced to about 15 kg, which can greatly improve the operability of the engine power unit.

The engine power unit having the above construction is not only used for the motor paraglider that carries a parachute on its back in the air, but also can obtain high output and is small and lightweight. It can be used for various purposes as an engine power unit for obtaining For example, it can be widely used as a power source for bicycles, boats, hovercrafts, and the like. It can also be used as a power source for life-saving transportation means such as a ski resort where vehicles such as automobiles cannot easily enter. Although various preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. That is.

[0017]

According to the engine power unit of the present invention, the engine is a horizontally opposed, air-cooled, two-cylinder, two-cycle engine, the rotary shaft of the starter coil is provided coaxially with the rotary shaft of the propeller, and the driving force of the engine is It acts directly on the rotating shaft. As a result, in the engine power unit of the present invention, vibration of the engine can be suppressed small, high output can be obtained, and size and weight reduction can be realized.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating an embodiment of an engine power unit according to the present invention.

FIG. 2 is an explanatory view showing a state where a person carries the embodiment of FIG. 1 on his / her back.

FIG. 3 is an explanatory view showing an embodiment of the fuel tank of the embodiment of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Engine 12 Cylinder part 14 Propeller 16 Rotor shaft of propeller 18 Starter coil 20 Intake device part 24 Diaphragm fuel supply device 25 Fuel tank

Claims (1)

[Claims] 1. An engine power unit in which a propeller is rotated by a driving force of an engine to generate thrust, wherein the engine is a horizontally opposed air-cooled two-cylinder two-cycle engine, and a rotary shaft of a starter coil for starting the engine is provided. An engine power unit, which is provided coaxially with a rotation shaft of a propeller, and causes the driving force of the engine to directly act on the rotation shaft of the propeller to rotationally drive the propeller.