JPH0738628U - Supercharging mechanism of internal combustion engine - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] In a 4-cycle internal combustion engine in which a piston in a cylinder makes two reciprocations in one explosion, the reciprocating motion of this piston induces a pressure fluctuation of air in the crank chamber. It Utilizing this induced pressure fluctuation, a large amount of air is supplied into the cylinder to increase the output of the 4-cycle internal combustion engine. [Structure] In a crank chamber 3 in which pressure fluctuations are repeated, an intake port provided with an intake valve 8 and an exhaust port provided with an exhaust valve 4 are provided, and an air supply chamber is provided between the exhaust port and an air supply port A of a cylinder. 5 is provided. The middle of the crank chamber discharge port to the air supply chamber 5 and the cylinder air supply port A was connected so that compressed air would not leak. The action is that the first piston reciprocating motion (compression, expansive expansion stroke) temporarily stores the pressurized fresh air in the crank chamber 3 in the air supply chamber 5, and the second piston reciprocating motion (exhaust, supply). In the air stroke), the newly added air is merged to supply a large amount of fresh air into the cylinder from the air supply port A.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a supercharging mechanism that supplies a large amount of fresh air into a cylinder to increase the output of an internal combustion engine.

[0002]

[Prior art]

 Conventional turbochargers have a mechanical drive system that drives with a part of the output from the engine body and an exhaust turbine drive system that drives with exhaust energy.Mechanical drive systems include a centrifugal turbocharger and an axial flow type. There are turbochargers, rotary positive displacement turbochargers, piston turbochargers, and exhaust turbine drive systems include centrifugal turbochargers and axial flow turbochargers.

In any of these superchargers, an expensive material that withstands high temperature and noise and this high-speed rotation that occurs when operating at high speed, and advanced production technology are required. Furthermore, before and after work operation, special attention must be paid to warm-up and cooling operations, and a technology familiar with turbochargers is required for operation and maintenance management.

[0004]

[Problems to be solved by the device]

 In the conventional supercharger technology, a part of the exhaust energy or the output from the engine body is used as a power source to drive a supercharger of another device to perform supercharging work. The supercharger operates at high speed and high temperature, and the structure is complicated and precise, which requires high production cost and advanced operation and maintenance management technology.

[0005]

[Means for solving the problem]

 The present invention utilizes a pressure fluctuation in the crank chamber, which was previously unnecessary for securing a large amount of air to be supplied into the cylinder in a four-cycle internal combustion engine. The method takes advantage of the effect that pressure fluctuations are induced in the air in the crank chamber by the reciprocating motion of the piston in the cylinder in an arbitrary sealed volume in which the cylinder and crank chamber are integrated. Realized with a simple structure, characterized in that fresh air pressurized by pressure fluctuations in the crank chamber repeated twice per explosion is pressed into the cylinder from the cylinder air supply port through the air supply chamber. .

[0006]

【Example】

 The details will be described with reference to the drawings. In the explosion and expansion stroke of FIG. 1, the explosion and expansion action occurs in the cylinder ignited by the ignition device 1 and the piston 2 moves toward the bottom dead center. By this movement, the fresh air in the crank chamber 3 under the piston is pressurized. The pressurized fresh air moves from the outlet C to the air supply chamber 5 and temporarily accumulates pressure.

In the exhaust stroke of FIG. 2, the exhaust port B opens and the piston 2 moves from the bottom dead center toward the top dead center, so that the expanded combustion gas is discharged to the outside of the cylinder. The operation of this process according to the present invention is that when the piston 2 moves from the bottom dead center to the top dead center, the inside of the crank chamber 3 becomes a negative pressure, and when the suction port D opens, the air cleaner 7 is operated. Fresh air is sucked into the crank chamber 3 from the outside.

In the present invention in the air supply stroke of FIG. 3, the fresh air temporarily accumulated in the air supply chamber 5 in the explosion and expansion stroke of FIG. Further, in this air supply stroke, the piston 2 moves from the top dead center to the bottom dead center, and the fresh air in the pressurized crank chamber 3 is additionally injected, so that a large amount of fresh air is introduced into the cylinder. It became possible to supply air.

In the compression stroke of FIG. 4, the intake port A and the exhaust port B of the cylinder to which a large amount of air is supplied are closed, and the piston 2 is moved from the bottom dead center to the top dead center to perform the compression action. To do. The action of the lower part of the piston in this process is that the piston 2 moves from the bottom dead center to the top dead center, so that the inside of the crank chamber 3 has a negative pressure. Then, fresh air is sucked into the crank chamber 3 through the air cleaner 7 to prepare for accumulating the fresh air in the next stroke.

[0010]

[Effect of device]

 The supercharging mechanism of the present invention utilizes pressure fluctuations in the crank chamber, which have not been used so far, and the structure is such that the crank chamber has an intake port with an intake valve and an exhaust valve with an exhaust valve. And, it has a simple structure that only an air supply chamber is provided between this discharge port and the cylinder air supply port. The supercharging mechanism does not have its own rotating parts that generate high temperature and noise, so that no special material such as special stainless steel is required for the material forming the supercharging mechanism, and the structure for maintenance management is also not required. It is a supercharge mechanism for a four-cycle internal combustion engine that is simple and has no rotating parts, so it does not require any particular attention.

[Brief description of drawings]

FIG. 1 is a diagram showing an explosive expansion stroke of a four-cycle internal combustion engine and movement of pressurized fresh air in a crank chamber to an air supply chamber.

FIG. 2 is a diagram showing an exhaust stroke of a four-cycle internal combustion engine and drawing fresh air into the crank chamber having a negative pressure from the outside of the machine.

FIG. 3 is an air supply in which the fresh air in the air supply chamber that has been temporarily accumulated in pressure and the fresh air from the additionally pressurized crank chamber are combined by the operation of the air supply valve and the movement of the piston. Itinerary.

FIG. 4 is a diagram showing a compression stroke of a four-cycle internal combustion engine and drawing fresh air into the crank chamber having a negative pressure from the outside of the machine.

[Explanation of symbols]

 1 Ignition device 2 Piston 3 Crank chamber 4 Discharge valve 5 Air supply chamber 6 Exhaust valve 7 Air cleaner 8 Intake valve 9 Air supply valve A Air supply port B Exhaust port C Exhaust port D Inlet port

Claims (1)

[Scope of utility model registration request] In a 4-cycle internal combustion engine in which a piston reciprocates two times in one explosion, when the piston in the cylinder reciprocates in an arbitrarily sealed volume in which the cylinder and the crank chamber are integrated, air is generated in the crank chamber. Pressure fluctuations are induced. An intake port and a discharge port provided with valves were provided in the crank chamber where this pressure fluctuation was repeated, and an air supply chamber was provided between the discharge port and the air supply port of the cylinder. A mechanism is provided so that compressed air does not leak from the crank chamber discharge port to the air supply chamber and the cylinder air supply port.
The action is to move fresh air in the crank chamber, which has been pressurized by the first piston reciprocating motion (compression, explosive expansion stroke), from the crank chamber discharge port to the air supply chamber to temporarily accumulate pressure. Then, by combining with the fresh air additionally pressurized in the second piston reciprocating motion (exhaust gas, air supply stroke), a large amount of air is supplied from the air supply port into the cylinder during the air supply stroke, increasing the output of the internal combustion engine. A supercharging mechanism for an internal combustion engine, which is characterized by utilizing pressure fluctuations in a crank chamber for the main purpose of.