JP2011185256A - Six cycle engine exclusive for hydrogen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make an engine system achieving high rotation and high output by a reciprocating engine using hydrogen as a fuel. <P>SOLUTION: Mixed air of hydrogen and air is compressed to a high pressure, and is supplied to a six cycle engine of a short stroke with a bore ratio smaller than or equal to 0.6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an engine using hydrogen as a fuel.

  The present invention makes it possible to use hydrogen in a reciprocating engine that cannot be actively used for backfire or knocking in the prior art.

Reference 1. Patent No. 4256602 Registration document in 20092. Patent No. 3885071 Registered in 2006 3. Patent No. 3631891 2004 registration document 4. Patent No. 3332274 2002 registered documents5. Patent No. 2955274 Registration document in 19996. Patent No. 2886204 Registration in 1999

Problems to be solved by the invention

  The calorific value of hydrogen is extremely low at about 1/3 of methane and 1/9 of propane. Therefore, the hydrogen engine is said to have a low output and become unpractical, but it is an object of the present invention to increase the output so that it can be used for an automobile engine.

  The gas mixture of hydrogen and air is very easy to ignite, and the early ignition at the time of valve over lap of the four-stroke engine stops the engine and causes the engine to be destroyed by the back fire. It is an object of the present invention to produce a high-speed and high-power engine safely and smoothly using hydrogen as a fuel in a reciprocating engine.

Means for solving the problem

In order to increase the output of the hydrogen engine, the present invention measures the increase of the output by compressing the pressure of hydrogen and air to 1 to 5 atm, mixing it in a ratio of 2.5 to 2.5, and supplying it. I found out that I can.

As a countermeasure for backfire that occurs when a mixed gas of high-pressure hydrogen and air is injected into the cylinder, this invention employs a 6-cycle engine, and 2 out of 6 strokes are used for scavenging intake and scavenging exhaust, and 1-5 atm. It was discovered that a smooth output could be secured without backfire or knocking by providing a process for cooling the cylinder before inhaling the hydrogen / air mixed gas.

  It was discovered that another problem with hydrogen engines is the relationship between cylinder bore and stroke. The combustion speed of the high-pressure hydrogen / air mixture used in hydrogen engines is faster than that of gasoline. Therefore, the operating time for the explosion pressure to move the piston is extremely shorter than that for gasoline. Therefore, it was found that a short stroke is essential for hydrogen engines compared to gasoline. Therefore, this inventor will modify the crankshaft, adjust the cylinder and connecting rod arm, set the bore ratio to 0.6 or less, and obtain high speed rotation to solve the small output of the hydrogen engine to the large output. It is said.

The invention's effect

  When hydrogen was set to a high pressure of 1 to 5 atm, and the air having the same pressure was mixed at a ratio of 1: 2.5, and this was put into a 6-cycle engine having a bore ratio of 0.60, the 400c, c. The single cylinder engine was able to realize a high speed of 2500 rpm, and the internal power engine performance test device manufactured by Tokyo Meter Co., Ltd. was able to record the shaft output of 12 kW.

  In the present invention, as shown in FIG. 1, high-pressure hydrogen from arrow 15 and high-pressure air from arrow 14 can be transformed to pressures 1 to 5 at pressure regulators 12 and 13, and at the same time to hydrogen 1 by flow regulator 11. Then, hydrogen and air are mixed while adjusting the flow rate so that the ratio of air is 2.5, and the mixed gas is press-fitted into the intake manifold 8 while adjusting the pressure with the accelerator 10.

  The mixed gas injected in the above enters the cylinder 1 from between the intake valve 6 and the valve seat 20. The piston 2 is lowered and the mixed gas is sufficiently injected into the cylinder. Reference numeral 5 is a spark plug, reference numeral 3 is a connecting rod, and reference numeral 4 is a crank.

  FIG. 2 shows the engine upper cover portion 16. Reference numeral 5 in the center is a spark plug, reference numeral 20 is an intake valve seat, reference numerals 18 and 19 are exhaust valve seats, and reference numeral 17 is a scavenging intake valve seat. .

  In FIG. 3, the crank 4 rotates and the piston 2 moves up to compress the mixed gas confined in the cylinder 1. The intake valve 6 and the exhaust valve 7 are closed.

FIG. 4 is a diagram in which the compressed mixed gas explodes when the spark plug 5 is ignited. Reference numeral 21 denotes a flame in which a mixed gas of hydrogen and air explodes. The piston moves downward and power is transmitted to the crank.

FIG. 5 shows the exhaust stroke of this engine. The crank 4 rotates, the piston 2 is pushed up by the connecting rod 3, and the hot exhaust gas staying in the cylinder 1 is discharged outside the engine from between the exhaust valve 7 and the exhaust valve seat 18 as indicated by an arrow 22. At this time, the intake valve is closed.

  As shown in FIG. 6, the exhaust valves 27 and 7 are closed, the scavenging intake valve 26 is opened, and scavenging air is drawn from the outside of the engine into the cylinder 1 as indicated by an arrow 24 to scavenge and cool the engine cylinder 1. Reference numeral 25 denotes a lubricant injector, and reference numeral 17 denotes a scavenging intake valve seat.

  As shown in FIG. 7, the piston 2 rises with the rotation of the crank 4. The exhaust valve 27 is opened, the intake valve 26 is closed, and the scavenging air is discharged outside the engine as indicated by an arrow 28.

  A single cylinder 4-cycle OHC4 valve of Honda CB400 (made in 2001) has a bore stroke of 92 × 58 mm and a bore stroke ratio of 1: 0.6, the connecting rod is lengthened by 12 mm, and the crank is trimmed. The camshaft rotation is set to one third of the crankshaft, the timing of the four valves is modified to a six-cycle engine as described above, the carburetor is removed, and from there, a pair of hydrogen and air as shown in FIG. A mixed gas of 2.5 was injected and the operating condition was tested with a test apparatus GWE-88 / 150R manufactured by Tokyo Meter Co., Ltd., and the result shown in FIG. p. m. A 12 kw shaft output was recorded. If the crank balancer is lightened, the connecting rod is shortened, and the weight of the piston is reduced, further results can be expected.

  As an engine that can be operated smoothly without trouble while being considered as an ideal fuel, it can be widely used not only for automobiles but also as various industrial prime movers.

Cross-sectional view of a 6-cycle engine dedicated to hydrogen according to the present invention during a mixed gas intake stroke, a pressure control accelerator for supplying hydrogen fuel, and an overall system diagram of a hydrogen / air mixer Arrangement of 4-valve seat on the engine top Cross section of mixed gas compression process Cross section of explosion process of high pressure gas mixture Cross section of exhaust stroke Cross section of scavenging and intake stroke Cross section of scavenging and exhaust stroke Engine performance curve by example

Claims (3)

A hydrogen-only 6-cycle engine, characterized in that a gas mixture of about 1 to 2.5 of hydrogen and air is supplied to a 6-cycle engine in a compressed state of 1 to 5 atm. The fuel gas supply accelerator that determines the shaft torque of the engine is a 6-cycle engine dedicated to hydrogen with adjustment of the pressure of the gas mixture of 1: 2.5 which is the combustion equivalent of hydrogen and air. A 6-cycle engine dedicated to hydrogen that has a short stroke piston with a cylinder diameter to stroke ratio of 1 to 0.60 or less, and produces high shaft output by high-speed rotation corresponding to fast combustion speed under pressure hydrogen

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