JPH034774Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a two-stroke internal combustion engine device that uses gas, particularly liquefied gas such as LPG or butane, as fuel.

BACKGROUND ART Conventionally, two-stroke internal combustion engine devices that use gas such as liquefied gas as fuel have complicated structures, making it difficult to form them into small and simple structures. In addition, the structure of the gas fuel supply system has become particularly complex, making it difficult to control the amount of gas fuel supplied, and it has not been possible to easily prevent gas leaks when the engine stalls, so a practically useful engine has not appeared. Nakatsuta.

Problems that the invention attempts to solve Therefore, the present invention was made to solve the problems of the conventional technology.It has a simple structure, operates stably, and easily controls gas fuel. It is an object of the present invention to provide a practically useful two-stroke internal combustion engine device that is capable of high performance and does not cause gas leakage.

Means for Solving the Problems That is, the two-stroke internal combustion engine device using gas such as liquefied gas as fuel according to the present invention has a gas cylinder that stores gas and is removably attached to the device, and a gas cylinder that stores gas and mixes it into the internal combustion engine. a gas flow path that guides gas from the gas cylinder to the gas flow path; an automatic pressure regulator that is arranged in the gas flow path and adjusts the pressure of the gas flowing in the gas flow path; A gas leak prevention device that is disposed in a gas flow path on the downstream side of the device and blocks the flow of gas in the gas flow path in response to a change in pressure in the crankcase of an internal combustion engine; and a downstream side of the gas leak prevention device. A gas metering valve is placed in the gas flow path to adjust the flow rate of the gas flowing through the gas flow path, a lubricant tank stores lubricant oil, and the lubricant oil is sucked from the lubricant tank to create an air-fuel mixture in the vent lily pipe. The automatic pressure regulator and gas leak prevention device are integrally configured, and the automatic pressure regulator and gas leak prevention device are installed close to the cooling air outlet of the exhaust muffler. It is characterized in that the bench lily pipe, gas metering valve, and lubricating oil pump device are integrally arranged.

Function: Therefore, the gas from the removably attached gas cylinder is adjusted to an appropriate pressure by the automatic pressure regulator, and is sent to the vent lily pipe via the gas leak prevention device and gas metering valve. and a gas leak prevention device, and a bench lily pipe,
The gas metering valve and lubricating oil pump device are integrated to make the device more compact, and the integrated automatic pressure regulator and gas leak prevention device are installed at the cooling air outlet of the exhaust muffler of an internal combustion engine. They can be placed close to each other to maintain them at an appropriate temperature and stabilize their operation.

Embodiments Next, the present invention will be described based on embodiments shown in the drawings.

In FIG. 1, an internal combustion engine 1 is a normal two-stroke internal combustion engine, and includes a cylinder 2, a piston 3 reciprocatably disposed within the cylinder 2, and a piston 3 rotatably supported within a crankcase 4. The cylinder 2 has a crankshaft 6 connected to the piston 3 via a connecting rod 5, and the cylinder 2 has an intake port 7 and an exhaust port 8 formed on its side. The intake port 7 communicates with the vent pipe 9 to supply a mixture of air and fuel into the crank chamber of the crankcase 4 and compress it in advance, and supplies the precompressed mixture to the cylinder 2 for ignition. The exhaust port 8 carries the fuel gas from the cylinder 2 to the muffler 10.
It is designed to be discharged to the outside through. Further, this internal combustion engine 1 uses a suitable liquefied gas such as LPG or butane as fuel, which is prefilled in a fuel source 11 having a suitable structure such as a normal cylinder or a cassette cylinder. The source gas cylinder 11 is removably mounted on a holder 58 at the bottom of the internal combustion engine device by a locking device 57, and the liquefied gas in the gas cylinder 11 is transferred to an automatic pressure regulator (APC) and a gas cylinder as described later. Leak prevention device 12
The gas is injected into the bench lily pipe 9 through the manually operated gas metering pot 13, and mixed in the vent lily pipe 9 with air purified from the outside through the air cleaner 14. Furthermore, the bench lily tube 9
is in communication with a lubricating oil supply device including a lubricating oil tank 15 and a lubricating oil pump device 16 as described later, and the lubricating oil supplying device is connected to the lubricating oil tank 1.
The lubricating oil stored in 5 is pumped to the bench lily pipe 9 by the lubricating oil pump device 16, and the lubricating oil is atomized and mixed into the air and liquefied gas fluid flowing inside the bench lily pipe 9, and the air and liquefied gas are mixed. A mixture of gas and lubricating oil is created, and this mixture is supplied from the crank chamber of the crank case 4 of the internal combustion engine 1 into the cylinder 2 as described above.

The automatic pressure regulator (APC) is connected to the gas cylinder 11 at its gas inlet 17 to receive the supply of liquefied gas, and an internal opening 18 of the gas inlet 17 is defined within the automatic pressure regulator APC. It opens into the pressure regulating compartment 19. A swing valve 20 pivotally mounted on a shaft 20' is provided in the pressure regulating compartment 19, and the swing valve 20 swings to open and close the internal opening 18 of the gas inlet 17. I'm starting to get it. The free end 20'' of the swing valve 20 is connected to a pressure regulating diaphragm 21 installed to partition one side of the pressure regulating compartment 19.The pressure regulating diaphragm 21 is connected to the swing valve 20. A biased pressure is applied by the pressure regulating compression coil spring 22 acting on the opposite side surface of the gas inlet 17 to push the swing valve 20 in the direction of opening the internal opening 18 of the gas inlet 17. The liquefied gas in the gas cylinder 11 is supplied into the pressure regulating compartment 19 from the gas inlet 17 of the automatic pressure regulator APC due to its internal pressure, so that as the pressure in the pressure regulating compartment 19 increases, The pressure regulating diaphragm 21 is moved against the action of the pressure regulating spring 22 to move the swing valve 20 to the gas inlet 1.
7 so as to close the internal opening 18. In this way, the gas pressure in the pressure regulating compartment 19 is automatically maintained at a value commensurate with the spring force of the pressure regulating spring 22, so that the swing valve 20 acts as an automatic pressure regulating valve. Preferably, the swing valve 20 regulates the gas pressure in the pressure regulating compartment 19 to maintain a pressure of about 200 to 500 mm of water. The automatic pressure regulator APC and the gas leakage prevention device 12 are integrally constructed as shown in the figure, and are arranged close to the cooling air outlet 59 below the muffler 10, so that the gas leakage prevention device 12 flows out from the cooling air outlet 59. The airflow keeps the temperature at an appropriate level.

The gas leak prevention device 12 includes a first compartment 2 separated from the pressure regulating compartment 19 by a partition wall 23.
4 is provided with a self-closing diaphragm 25, which diaphragm 25 defines a second compartment 26 opposite the first compartment 24; The internal combustion engine 1 via the stop valve 27
The pressure inside the crankcase 4 is accepted. In the first compartment 24, a valve body 29 containing a reciprocating valve 28 is fixed to the partition wall 23 by a screw 30.
Reference numeral 9 denotes a valve chamber 32 communicating with the pressure regulating compartment 19 through an inlet hole 31 formed in the partition wall 23.
and an outlet hole 33 communicating the valve chamber 32 with the first compartment 24. The reciprocating valve 28
is connected to the automatic closing diaphragm 25 through the outlet hole 33 of the valve body 29, and further includes:
The reciprocating valve 28 is biased by a self-closing compression coil spring 34 acting between the reciprocating valve 28 and the partition wall 23 so as to close the outlet hole 33 of the valve body 29. The first compartment 24 is a gas leak prevention device 12
The gas outlet 35 of is connected to the gas inlet 36 of the manually operated gas metering pot 13.

With this configuration, when the internal combustion engine 1 is stopped, the pressure in the second compartment 26 is approximately atmospheric pressure, so the reciprocating valve 28 is operated by the automatic closing spring 34 and the pressure regulating The outlet hole 33 is reliably closed by the action of gas pressure in the compartment 19, and the valve chamber 3
2 is prevented from leaking into the first compartment 24 and from there into the gas metering pot 13. When the internal combustion engine 1 is started and operated, the average pressure in the crank chamber of the crankcase 4 increases, and therefore the pressure in the second compartment 26 also increases, and at the same time the pressure in the vent lily tube 9 becomes negative. Therefore, the pressure inside the first compartment 24 becomes negative. Therefore, the automatic closing diaphragm 25 moves toward the first compartment 24,
The reciprocating valve 28 is moved against the action of the self-closing spring 34 and the gas pressure to open the outlet hole 33 of the valve body 29.
, thereby allowing the gas in the valve chamber 32 to flow through the outlet hole 3
3 into the first compartment 24 and from there through a gas outlet 35 to the gas metering tank 13 . In this way, the gas leak prevention device 12
The system can automatically shut off the gas even when the engine suddenly stops due to so-called engine stalling, etc., thereby preventing the risk of gas leakage.

The outlet 37 of the gas metering pot 13 communicates with a gas jet port 38 that opens toward the lower part of the bench lily pipe 9, and the gas metering pot 13 passes through the valve member 39 inside the tapered hole 40 to ensure an airtight state. It is arranged so that it can be rotated while maintaining the A lever arm 41 is attached to one end of the valve member 39 that protrudes from the large diameter end of the tapered hole 40.
1 is operatively connected to a throttle lever (not shown) so that it can be manually operated and rotated as desired by an operator. Furthermore, the above-mentioned Kotoku 13
A torsion spring 4 is inserted between the body of the lever arm 41 and the lever arm 41.
2 is provided to act on the torsion spring 42, and the torsion spring 42 is connected to the communication hole 4 formed in the valve member 39.
3 acts to maintain the valve member 39 at all times in an angular position that blocks communication between the gas inlet 36 and the outlet 37. A compression coil spring 44 acts on the other end of the valve member 39 protruding from the small diameter end of the tapered hole 40 to prevent the valve member 39 from coming out of the tapered hole 40, thereby maintaining airtightness. The communication hole 43 of the valve member 39 is formed in a shape whose width gradually decreases in the circumferential direction, and when the valve member 39 is rotated against the action of the torsion spring 42, the communication hole 43
3 is aligned with the gas inlet 36 and outlet 37, the communication area between them is gradually increased, and the
The flow rate of gas flowing through can be adjusted linearly. The gas metered by the kettle 13 is ejected from the gas ejection port 38 into the bench lily pipe 9,
The air is mixed from the air cleaner 14 into the air flow flowing through the bench lily tube 9.

In this way, the automatic pressure regulator APC, the gas leak prevention device 12, and the gas metering pot 13 are sequentially arranged in the gas flow path 60 (partially shown by the chain double-dashed line) extending from the gas cylinder 11 to the vent lily pipe 9. And each operates as described above.

As mentioned above, the lubricating oil supply device for supplying lubricating oil to the internal combustion engine 1 includes the lubricating oil tank 15 for storing lubricating oil shown in FIG. 1, and the lubricating oil tank 15 shown in FIGS.
The lubricating oil pumping device 16 has a lubricating oil pumping device 16 shown in more detail in the drawing, and the lubricating oil pumping device 16 has a lubricating oil tank 1.
5 to suck lubricating oil from the lubricating oil tank 15.

The lubricating oil pump device 16 is disposed close to the bench lily pipe 9, and has a pump diaphragm 45 mounted therein. A pulsating pressure chamber 46 and a pump chamber 47 are formed on both sides of the pump diaphragm 45, and the pulsating pressure chamber 46 is connected to the crank chamber of the crankcase 4 of the internal combustion engine 1 to receive the pulsating pressure in the crank chamber. The lubricating oil pump device 16 is connected to the lubricating oil tank 15 at an inlet passage 48 thereof, and the inlet passage 48 is connected to a pump chamber 47 via an inlet side check valve (not shown). communicates with a lubricating oil spout 52 via an outlet side check valve (not shown) and an outlet passage 51, and the lubricating oil spout 5
2 opens into the bench lily tube 9 at the side downstream of the gas outlet 38 of the bench lily tube 9. The outlet passage 51 is provided with a lubricating oil metering valve device 53, and has a metering screw 54 that is screwed into a threaded hole in the side wall of the device, and the tip of the metering screw 54 is inserted into the outlet passage 51. By rotating the metering screw 54, the tip thereof can be moved in and out of the outlet passage 51 to increase or decrease the flow area of the outlet passage 51. A compression coil spring 55 is provided between the outer head of the metering screw 54 and the side wall of the device, and this spring 55 absorbs play in the threaded portion of the metering screw 54 to adjust the flow rate. It can be held accurately. Further, as clearly shown in FIG. 2, the bench lily pipe 9, the gas metering pot 13, and the lubricating oil pump device 16 are integrally constructed in a compact manner.

With this configuration, when the internal combustion engine 1 is started and the crankshaft 6 is rotated, the pulsating pressure inside the crank chamber of the crank case 4 is transferred to the pulsating pressure chamber 4.
6 and in response, the pump diaphragm 45 pulses to draw lubricating oil from the inlet passage 48 through the check valve into the pump chamber 47 and then pump the lubricant in the pump chamber 47 through the check valve and the outlet. The lubricating oil is force-fed through the passage 51 to the lubricating oil spout 52, and the lubricating oil is atomized from the lubricating oil spout 52 and spouted into the bench lily pipe 9, and is mixed with the flow of air and gas flowing through the bench lily pipe 9 to form air and gas. and lubricating oil, and this mixture is supplied to the internal combustion engine 1.

A glow plug 56 is attached to the head portion of the cylinder 2 of the internal combustion engine 1 as an ignition plug. The glow plug 56 is connected to a suitable power source (not shown) and energized when the engine is started, and ignites the air-fuel mixture in the cylinder 2. If the internal combustion engine 1 is an engine with a high compression ratio (epsilon>11, for example), the glow plug 56 will ignite the air-fuel mixture in the cylinder 2 using only the heat of its red-hot coil even if the power is cut off after the engine has started. can do.

By using the glow plug 56 to ignite the liquefied gas that is the fuel, the red-hot coil can be used as a heat source when starting the engine, making engine starting easier and eliminating the need for magneto in conventional ignition systems. This eliminates the need, making it possible to reduce the weight and cost of the device.

Effects of the invention With the structure of the invention explained above, the invention has the following effects:
The gas from the removably attached gas cylinder is adjusted to an appropriate pressure by an automatic pressure regulator and sent to the vent pipe via a gas leak prevention device and a gas metering valve. In addition, the bench lily pipe, gas metering valve, and lubricating oil pump device are integrated to make the device more compact.In addition, the automatic pressure regulator and gas leak prevention device are integrated. By placing the device close to the cooling air outlet of the exhaust muffler of an internal combustion engine, it is possible to maintain them at an appropriate temperature and stabilize the operation. The device can be formed into a small and simple structure, and the pressure of the gas fuel to the vent pipe to the internal combustion engine can be stably adjusted without being affected by the ambient temperature.

[Brief explanation of the drawing]

FIG. 1 is a sectional view schematically showing the overall configuration of a two-stroke internal combustion engine device according to the present invention;
The figure is a partially enlarged sectional view of Figure 1, and Figure 3 is a partial enlarged cross-sectional view of Figure 1.
FIG. 2 is an enlarged cross-sectional view of the illustrated portion, taken at a right angle to the cross-section of FIG. 2; 1... Internal combustion engine, 4... Crank case, 9...
... Bench lily pipe, 10 ... Muffler, 11 ... Gas cylinder, 12 ... Gas leak prevention device, 13 ...
Gas metering valve, 15... Lubricating oil tank, 16... Lubricating oil pump device, 59... Cooling air outlet, 60...
Gas flow path, APC... automatic pressure regulator.

Claims (1)

[Scope of utility model registration request] A gas cylinder 11 that stores gas fuel such as liquefied gas and is detachably attached, a bench lily pipe 9 that supplies a mixture to the internal combustion engine 1, and a gas flow path 60 that guides gas from the gas cylinder to the vent lily pipe,
an automatic pressure regulator (APC) disposed in the gas flow path to adjust the pressure of gas flowing through the gas flow channel; a gas leak prevention device 12 that blocks the flow of gas in the gas flow path in response to a change in pressure within the crankcase 4; A gas metering valve 13 that adjusts the flow rate of gas flowing through the flow path, a lubricating oil tank 15 that stores lubricating oil, and a lubricating oil that sucks lubricating oil from the lubricating oil tank and squirts it into the air-fuel mixture in the vent lily pipe. The automatic pressure regulating device and the gas leak prevention device are integrally configured, and the automatic pressure regulating device and the gas leak prevention device are arranged close to the cooling air outlet 59 of the exhaust muffler 10. A two-stroke internal combustion engine device, characterized in that the vent pipe, the gas metering valve, and the lubricating oil pump device are integrally arranged.