JPH04121430U - internal combustion engine - Google Patents

Abstract

(57) [Summary] [Purpose] In a 4-cycle piston engine, the crank chamber is used as a pump chamber to completely burn the mixed gas and scavenge air during the exhaust stroke. [Structure] The crank chamber 3 is sealed and an air supply valve 10 is attached, and the vicinity of the piston bottom dead center in the cylinder 1 and the cushion chamber 3 are connected by an air supply pipe 8, and an air supply valve 9 is attached to the air supply pipe 8. Attach. When the piston 2 descends to near the bottom dead center, compressed air in the crank chamber 3 is fed into the cylinder 1.

Description

[Detailed explanation of the idea]

0001

[Problems to be solved by conventional techniques and ideas]

As is well known, a typical reciprocating piston type 4-stroke engine Equipped with a valve and an exhaust valve, the suction and compression correspond to the top and bottom of the piston in the cylinder. The explosion-exhaust stroke is repeated, and the vertical movement of the piston is converted into rotational movement by the crank. and then outputs it.

0002 By the way, the pressure in the crank chamber fluctuates in response to the reciprocating motion of the piston. However, it is especially used as a mixed gas supply pump in 2-cycle engines. However, in a 4-cycle engine, it only serves as resistance to the reciprocating movement of the piston. It is. Therefore, this invention is an engine that effectively utilizes the crank chamber in a 4-cycle engine. This is a proposal for an internal combustion engine.

0003

[Means to solve the problem]

The internal combustion engine according to the present invention is a reciprocating piston type four-stroke engine. The crank chamber has a sealed structure, and the crank chamber and the vicinity of the piston bottom dead center of the cylinder are communicated. In addition to installing an air supply pipe to The crank chamber shall be equipped with an air supply valve that opens when the crank chamber is at low pressure. It is characterized by:

0004

[Effect]

During the suction stroke, the piston moves from top dead center to bottom dead center, but at this time the crank chamber Air is compressed, and when the piston reaches just before bottom dead center, the compressed air in the crank chamber is compressed. Supplied within the holder. Furthermore, in the next compression stroke, the pressure in the crank chamber becomes low, Air is supplied to the crank chamber, and the air in the crank chamber is compressed during the explosion stroke. When moving from the engine to the exhaust stroke, high-pressure air in the crank chamber is supplied to the cylinder as scavenging air. be provided.

[0005]

【Example】

Next, embodiments of the present invention will be described. The internal combustion engine according to the present invention has an internal combustion engine in cylinder 1 similar to a conventional four-stroke engine. The piston 2 is tightly inserted into the crank chamber 3, which communicates with the cylinder 1. 4 and the piston 2 are connected by a connecting rod 5, and the cylinder head part A suction valve 6 and an exhaust valve 7 are provided in the crankshaft, and the crank chamber 3 is also sealed. An air supply pipe 8 is provided to communicate between the engine chamber 3 and the vicinity of the top dead center of the piston 2 in the cylinder 1. , an air supply valve 9 is attached to this air supply pipe 8, and an air supply valve is attached to the crank chamber 3. be. In addition, the air supply valve 9 is equipped with a spring, so that when the pressure in the crank chamber 3 is higher than a predetermined pressure, Similarly to the air supply valve, the air supply valve 10 is equipped with a spring to open the crank chamber 3. It is designed to open only when the internal pressure drops below atmospheric pressure.

[0006] To explain the operation of the internal combustion engine, the piston 2 moves during the intake stroke. It moves from top dead center to bottom dead center, but at that time, the intake valve 6 opens and the mixed gas flows into the cylinder. Introduced within 1. At the same time, the movement of the piston 2 causes the air in the crank chamber 3 to When the piston 2 reaches just before the bottom dead center, the intake valve 6 opens. When closed and at the same time the air supply pipe 8 communicates with the cylinder 1, the compressed air in the crank chamber 3 flows into the cylinder. It is supplied into the linder 1. Therefore, more combustion air is supplied into cylinder 1. complete combustion of the mixed gas is achieved. In the next compression stroke, the piston As the engine 2 moves, the pressure inside the crank chamber 3 becomes low, the air supply valve 10 opens, and the crank chamber Air is supplied to 3. The air in crank chamber 3 is compressed during the explosion process, and the explosion process When moving from the engine to the exhaust stroke, high-pressure air in the crank chamber 3 enters the cylinder 1 as scavenging air. It is supplied to the engine to promote the exhaust of combustion gases.

[0007] Note that the present invention is not limited to the above-mentioned embodiments, and the air supply valve 9 and the air supply valve 10 are The operation may be controlled forcibly using a cam, or the air supply valve 9, the air supply valve 10 corresponds to the suction valve 6 and exhaust valve 7 to determine their operation timings, and perform suction work. Combustion air is sent into cylinder 1 only at certain times to obtain a turbo effect. You may do so.

[0008]

[Effect of the idea]

As described above, the present invention provides a clamp for reciprocating piston type 4-stroke engines. The crank chamber has a sealed structure, and the crank chamber and the vicinity of the piston bottom dead center of the cylinder are communicated. In addition to installing an air supply pipe, an air supply valve is attached to the air supply pipe, and an air supply valve is attached to the crank chamber. This makes effective use of the crank chamber to achieve complete combustion and improve exhaust efficiency. It was able to provide engines (internal combustion engines).

[Brief explanation of drawings]

FIG. 1 is a sectional view of an engine showing an embodiment of the present invention.

[Fig. 2] An explanatory diagram showing the operation of the engine (intake stroke).
(A) indicates the start of inhalation, and (B) indicates the end of inhalation.

FIG. 3 is an explanatory diagram showing the operation (compression stroke) of the engine.

FIG. 4 is an explanatory diagram showing the operation (explosion stroke) of the engine.

FIG. 5 is an explanatory diagram showing the operation (exhaust stroke) of the engine.

[Explanation of symbols]

1 cylinder 2 piston 3 Crank chamber 4 crank 5 Conrod 6 Suction valve 7 Exhaust valve 8 Air pipe 9 Air supply valve 10 Air supply valve

Claims (1)

[Scope of utility model registration request] Claim 1: In a reciprocating piston type 4-cycle engine, the crank chamber has a sealed structure, and an air pipe is provided to communicate the crank chamber with the vicinity of the bottom dead center of the piston in the cylinder, and when the crank chamber is under high pressure. An internal combustion engine characterized in that the crank chamber is provided with an air supply valve that opens when the crank chamber is at low pressure.