CN104500244A - Combustion chamber volume variable system with rotating mechanism - Google Patents

Abstract

A combustion chamber variable volume system with a rotating mechanism belonging to the technical field of internal combustion engines, including a cylinder, a cylinder head, a piston, a piston ring, a connecting rod, a volume chamber, a spring, a rotating body, and a rotating shaft. The volume chamber is arranged on the side of the piston At the top, the rotating shaft is embedded in the piston, the rotating body is arranged in the volume chamber and is fixed with the rotating shaft, and the rotating body is connected with the piston through a spring. In high-speed working conditions, when the maximum combustion pressure in the combustion chamber is high, the rotating body rotates counterclockwise, and the volume of the combustion chamber becomes larger; The chamber volume is reduced. The invention has reasonable structure and simple design, and is suitable for the optimal design of engine pistons.

Description

Combustion chamber volume variable system with rotary mechanism

technical field

The invention belongs to a compression ratio design device in the technical field of internal combustion engines, in particular to a combustion chamber volume variable system with a rotating mechanism.

Background technique

The compression ratio refers to the degree to which the engine mixture is compressed, using the ratio of the total volume of the cylinder before compression to the volume of the cylinder after compression (that is, the volume of the combustion chamber). At present, the vast majority of automobiles use the so-called 'reciprocating engine'. Simply put, in the engine cylinder, there is a piston that is doing linear reciprocating motion over and over again, and the cycle is endless, so in this cycle and continuous work There is a certain range of motion in the stroke. As far as a certain cylinder of the engine is concerned, when the stroke of the piston reaches the lowest point, the position at this time is called the bottom dead center. The volume formed by the entire cylinder including the combustion chamber is the maximum stroke volume. When the piston moves in the opposite direction, it reaches When the highest point is at the position, this point is called the top dead center, and the resulting volume is the minimum volume of the entire piston stroke, and the compression ratio to be calculated is the ratio of the maximum stroke volume to the minimum volume. The purpose of variable compression ratio is to improve the fuel economy of a supercharged engine. In a supercharged engine, the compression ratio is lower than in a naturally aspirated engine in order to prevent knocking. When the boost pressure is low, the thermal efficiency is reduced. The fuel economy is reduced. Especially in the turbocharged engine, due to the slow rise of the boost degree, the torque rise is also very slow under the condition of low compression ratio, forming the so-called boost lag phenomenon. That is to say, when the engine is at a low speed, the supercharging effect lags behind, and the supercharging system does not take effect until the engine accelerates to a certain speed. In order to solve this problem, variable compression ratio is an important method. That is to say. In the low load condition with low supercharging pressure, the compression ratio can be increased to the same or higher than that of the naturally aspirated engine; In other words, the compression ratio is continuously adjusted as the load changes, so that the thermal efficiency can be improved from low load to high operating conditions. But the compression ratio of existing motor is immutable, because combustion chamber volume and cylinder working volume are all fixed parameters, have been fixed in the design.

After searching the existing literature, it is found that the patent application number is 20092014360.5, and the name is a patented technology of a mechanism that can change the compression ratio of the engine. A variable compression ratio mechanism is proposed to make the combustion efficiency higher, but its compression ratio changes. Need artificial control, can not achieve self-regulation.

Contents of the invention

The present invention aims at the above-mentioned shortcomings, and provides a combustion chamber volume variable system with a rotating mechanism, so that the compression ratio of the engine can be self-adjusted.

The present invention is achieved through the following technical proposals. The present invention includes a cylinder, a cylinder head, a piston, a first piston ring, a second piston ring, a connecting rod, a volume cavity, a rotating shaft, a rotating body, and a spring. The cylinder head is arranged on the cylinder The upper end of the cylinder, the piston is arranged in the cylinder, the cylinder, the cylinder head, and the piston together form the combustion chamber, the first piston ring and the second piston ring are arranged on the top of the piston, the connecting rod is connected with the piston, and the volume chamber is arranged in the piston The rotating shaft is embedded in the piston, the rotating body is arranged in the volume cavity and fixed with the rotating shaft, and the rotating body is connected with the piston through a spring.

Further, in the present invention, the longitudinal section of the volume cavity is arc-shaped, and the cross-section of the moving body is rectangular.

The beneficial effects of the invention are: the invention has reasonable design and simple structure, the compression ratio of the engine is variable under different engine speeds, and the combustion efficiency of the engine in each working condition is high.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of A-A section among Fig. 1;

Fig. 3 is the structural representation of B-B section among Fig. 1;

The labels in the accompanying drawings are respectively: 1, cylinder, 2, cylinder head, 3, piston, 4, first piston ring, 5, second piston ring, 6, connecting rod, 7, volume chamber, 8, rotating shaft, 9, rotating body, 10, spring.

Detailed ways

The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. This embodiment is based on the technical solution of the present invention, and provides detailed implementation methods and specific operating procedures, but the scope of protection of the present invention is not limited to the following embodiments. .

Example

The embodiment of the present invention is shown in Fig. 1 to Fig. 3, and the present invention comprises cylinder 1, cylinder head 2, piston 3, first piston ring 4, second piston ring 5, connecting rod 6, volume chamber 7, rotating shaft 8, The rotating body 9, the spring 10, the cylinder head 2 are arranged on the upper end of the cylinder 1, the piston 3 is arranged in the cylinder 1, the cylinder 1, the cylinder head 2, and the piston 3 together form a combustion chamber, the first piston ring 4, the second piston ring 5 are arranged on the top of the piston 3, the connecting rod 6 is connected with the piston 3, the volume chamber 7 is arranged on the top of the piston 3, the rotating shaft 8 is embedded in the piston 3, the rotating body 9 is arranged in the volume chamber 7 and is connected with the rotating The shaft 8 is fixed together, the rotating body 9 is connected with the piston 3 through the spring 10, the longitudinal section of the volume cavity 7 is arc-shaped, and the cross section of the moving body 10 is rectangular.

During the implementation of the present invention, the rotating body 9 and the rotating shaft 8 can rotate together in the volume cavity 7 . When the rotating speed of the engine is high and the maximum combustion pressure of the combustion chamber is relatively large, the rotating body 9 rotates counterclockwise and compresses the spring 10, the combustion chamber of the engine becomes larger, the compression ratio becomes smaller, and the knocking tendency of the engine becomes smaller; When the rotational speed is low and the maximum combustion pressure of the combustion chamber is small, under the elastic action of the spring 10, the rotating body 9 rotates clockwise, the combustion chamber of the engine becomes smaller, the compression ratio becomes larger, and the combustion efficiency of the engine is higher.

Claims (2)

1. A combustion chamber variable volume system with a rotating mechanism, including a cylinder (1), a cylinder head (2), a piston (3), a first piston ring (4), a second piston ring (5) and a connecting The rod (6), the cylinder head (2) are arranged on the upper end of the cylinder (1), the piston (3) is arranged in the cylinder (1), and the cylinder (1), the cylinder head (2), and the piston (3) together form a combustion chamber, the first piston ring (4) and the second piston ring (5) are arranged on the top of the piston (3), the connecting rod (6) is connected with the piston (3), and it is characterized in that it also includes a volume chamber ( 7), the rotating shaft (8), the rotating body (9), the spring (10), the volume cavity (7) is arranged on the top of the piston (3), the rotating shaft (8) is embedded in the piston (3), and the rotating body ( 9) Arranged in the volume cavity (7) and fixed together with the rotating shaft (8), the rotating body (9) is connected with the piston (3) through the spring (10). 2. The combustion chamber variable volume system with a rotating mechanism according to claim 1, characterized in that the longitudinal section of the volume chamber (7) is arc-shaped, and the cross section of the moving body (10) is rectangular.