CN102953779B - Lever regulation type lift variable system - Google Patents

Abstract

A lever-adjustable variable lift system in the field of mechanical design technology, including: intake valve, exhaust valve, compressor, turbine, lever, tappet, volume chamber, moving body, connecting pipe and spring, moving body installation In the volume cavity and in sealing contact with the inner wall of the volume cavity, there is a square hole on the upper wall of the volume cavity, and the lower end of the moving rod passes through the square hole on the upper wall of the volume cavity and is consolidated with the upper wall of the moving body. The upper end of the travel rod is in contact with the lever. When the pressure in the intake pipe of the engine is high, the moving body drives the moving rod to move to the right, and the lift of the intake valve increases; when the pressure in the intake pipe is small, the moving body drives the moving rod to move to the left, and the lift of the intake valve becomes larger. Small. The invention has reasonable design and simple structure, and is suitable for variable valve lift systems of engines.

Description

Lever-adjustable lift variable system

technical field

The invention relates to a mechanically designed engine intake valve lift adjustment system, in particular to a lever-adjustable lift variable system.

Background technique

The valve lift of the traditional gasoline engine is fixed and invariable, that is, there is only one cam profile of the camshaft, which makes it impossible for the lift to make the engine respond well in both high-speed and low-speed areas. The valve lift or cam profile design of a traditional gasoline engine is a balanced choice for the engine under all operating conditions. As a result, the engine can neither get the best high-speed efficiency nor the best low-speed torque, but it can get The most balanced performance under all working conditions. The adoption of variable valve lift enables the engine to obtain the required valve lift in both high-speed and low-speed areas, thereby improving the high-speed power and low-speed torque of the engine.

After searching the existing technical literature, it is found that the Chinese patent application number is 200910190522.1, and the patent name is: a hydraulic valve mechanism with variable valve lift. This patent technology provides a device with variable valve lift, which can better Taking into account the high and low speed conditions of the engine. But its design requires a special control structure, and the whole system structure is complex.

Contents of the invention

The present invention aims at the disadvantages of the above-mentioned prior art, and provides a lever-adjustable lift variable system, the valve lift can be continuously variable, and no special control mechanism is needed.

The present invention is achieved through the following technical proposals, and the present invention comprises: cylinder, piston, cylinder head, intake duct, exhaust duct, intake valve, exhaust valve, compressor intake pipe, compressor, engine intake pipe, Turbine exhaust pipe, turbine, engine exhaust pipe, lever, tappet, connecting pipe, volume chamber, moving body, moving rod and spring, the piston is installed in the space surrounded by the cylinder and is in sealing contact with the inner wall of the cylinder, The air outlet of the intake port and the air inlet of the exhaust port are connected with the cylinder head, the lower end surface of the intake valve and the lower end surface of the exhaust valve are both in the combustion chamber, and the air inlet and outlet of the compressor are respectively connected with the compressor intake pipe. The air outlet of the engine intake pipe is connected with the air inlet of the engine intake pipe, the air outlet of the engine air intake pipe is connected with the air inlet of the air intake passage, and the air inlet and outlet of the turbine are respectively connected with the air outlet of the engine exhaust pipe and the air inlet of the turbine exhaust pipe. The air inlet is connected, the air inlet of the engine exhaust pipe is connected with the air outlet of the exhaust duct, the two ends of the lever are respectively connected with the upper end of the intake valve and the upper end of the tappet, and the cross section of the volume chamber is rectangular , the moving body is installed in the volume cavity and is in sealing contact with the inner wall of the volume cavity. There is a square hole on the upper wall of the volume cavity, and the lower end of the moving rod passes through the square hole on the upper wall of the volume cavity and is fixed to the upper wall of the moving body. Knotted together, the upper end of the moving rod is in contact with the lever, the two ends of the connecting pipe are respectively connected with the lower wall of the volume cavity and the engine exhaust pipe, and the left wall of the moving body is connected with the left wall of the volume cavity through a spring.

In the present invention, the moving body and the moving rod are fixed together, the moving body can move left and right in the volume cavity, and the moving rod can move left and right following the moving body. In high-speed working conditions, the pressure in the exhaust pipe of the engine is high, and the pressure in the volume cavity on the left side of the moving body is also high. The moving body drives the moving rod to move to the right and stretches the spring, and the ratio of the lever length on the left and right sides of the moving rod becomes larger. This increases the intake valve lift. In low-speed working conditions, the pressure in the exhaust pipe of the engine is low, and the pressure in the volume cavity on the left side of the moving body is also low. Under the tension of the spring, the moving body drives the moving rod to move to the left. The ratio becomes smaller, so that the intake valve lift becomes smaller.

Compared with the prior art, the present invention has the following beneficial effects: the present invention is reasonable in design, simple in structure, can realize continuous variable valve lift, and does not need a special control mechanism.

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;

Among them: 1. Cylinder, 2. Piston, 3. Cylinder head, 4. Intake port, 5. Exhaust port, 6. Intake valve, 7. Exhaust valve, 8. Compressor intake pipe, 9. Compressor , 10, engine intake pipe, 11, turbine exhaust pipe, 12, turbine, 13, engine exhaust pipe, 14, lever, 15, tappet, 16, connecting pipe, 17, volume chamber, 18, moving body, 19 , moving bar, 20, 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

As shown in Fig. 1 and Fig. 2, the present invention comprises: cylinder 1, piston 2, cylinder head 3, intake duct 4, exhaust duct 5, intake valve 6, exhaust valve 7, compressor intake pipe 8, compressed air Engine 9, engine intake pipe 10, turbine exhaust pipe 11, turbine 12, engine exhaust pipe 13, lever 14, tappet 15, connecting pipe 16, volume chamber 17, moving body 18, moving rod 19 and spring 20, piston 2 Installed in the space enclosed by the cylinder 1 and in sealing contact with the inner wall of the cylinder 1, the air outlet of the intake passage 4 and the intake port of the exhaust passage 5 are connected with the cylinder head, and the bottom of the intake valve 6 The lower end face of the end face and the exhaust valve 7 are all in the combustion chamber, and the air inlet and outlet of the compressor 9 are connected with the air outlet of the compressor inlet pipe 8 and the air inlet of the engine inlet pipe 10 respectively, and the air outlet of the engine inlet pipe 10 is connected with the air inlet of the engine inlet pipe 10. The air inlet of air inlet 4 is connected, and the air inlet and outlet of turbine 12 are connected with the air outlet of engine exhaust pipe 13, the air inlet of turbine exhaust pipe 11 respectively, and the air inlet of engine exhaust pipe 13 is connected with exhaust pipe. The air outlet of the air channel 5 is connected, and the two ends of the lever 14 are respectively connected with the upper end of the intake valve 6 and the upper end of the tappet 15. The cross section of the volume chamber 17 is rectangular, and the moving body 18 is installed in the volume chamber 17. It is in sealing contact with the inner wall of the volume chamber 17. There is a square hole on the upper wall of the volume chamber 17. The lower end of the moving rod 19 passes through the square hole on the upper wall of the volume chamber 17 and is consolidated with the upper wall of the moving body 18. The upper end of the moving rod 19 is in contact with the lever 14, and the two ends of the connecting pipe 16 communicate with the lower wall surface of the volume chamber 17 and the engine exhaust pipe 13 respectively, and the left wall surface of the moving body 18 is connected to the left wall surface of the volume chamber 17 by the spring 20. connected.

In the present invention, the moving body 18 and the moving rod 19 are fixed together, the moving body 18 can move left and right in the volume chamber 17 , and the moving rod 19 can move left and right following the moving body 18 . In high-speed working conditions, the pressure in the exhaust pipe 13 of the engine is relatively high, and the pressure in the volume cavity 17 on the left side of the moving body 18 is also high. The moving body 18 drives the moving rod 19 to move to the right and stretches the spring 20. The ratio of the length of the lever on both sides becomes larger, so that the lift of the intake valve becomes larger. In low-speed working conditions, the pressure in the exhaust pipe 13 of the engine is low, and the pressure in the volume chamber 17 on the left side of the moving body 18 is also low. Under the tension of the spring 20, the moving body 18 drives the moving rod 19 to move to the left. The lever length ratio on the left and right sides of the moving rod 19 becomes smaller, so that the lift of the intake valve becomes smaller.

Claims (1)

1. A lever-adjustable lift variable system, comprising a cylinder (1), a piston (2), a cylinder head (3), an intake port (4), an exhaust port (5), and an intake valve (6) , exhaust valve (7), compressor intake pipe (8), compressor (9), engine intake pipe (10), turbine exhaust pipe (11), turbine (12), engine exhaust pipe (13), The lever (14) and the tappet (15), the piston (2) are installed in the space surrounded by the cylinder (1) and are in sealing contact with the inner wall of the cylinder (1), the air outlet of the air inlet (4), the exhaust The intake ports of the gas passage (5) are all connected with the cylinder head, the lower end faces of the intake valves (6) and the exhaust valves (7) are all in the combustion chamber, and the air inlets and outlets of the compressor (9) are connected to the cylinder head respectively. The air outlet of the air compressor air inlet pipe (8) is connected with the air inlet of the engine air inlet pipe (10), the air outlet of the engine air inlet pipe (10) is connected with the air inlet of the air inlet (4), and the turbine (12 ) inlet and outlet are connected with the air outlet of the engine exhaust pipe (13) and the air inlet of the turbine exhaust pipe (11) respectively, and the air inlet of the engine exhaust pipe (13) is connected with the air inlet of the exhaust duct (5) The air outlet is connected, and the two ends of the lever (14) are respectively connected with the upper end of the intake valve (6) and the upper end of the tappet (15), and it is characterized in that it also includes a connecting pipe (16), a volume chamber (17), Moving body (18), moving rod (19) and spring (20), the cross section of volume cavity (17) is rectangle, and moving body (18) is installed in the volume cavity (17) and with the inside of volume cavity (17) There is a square hole on the upper wall of the volume chamber (17), and the lower end of the moving rod (19) passes through the square hole on the upper wall of the volume chamber (17) and is solidified on the upper wall of the moving body (18). Together, the upper end of the moving rod (19) is in contact with the lever (14), and the two ends of the connecting pipe (16) are respectively connected with the lower wall surface of the volume chamber (17) and the engine exhaust pipe (13), and the moving body (18 ) is connected with the left wall of volume cavity (17) by spring (20); the lift of intake valve (6) can be realized continuously variable by spring (20), and does not need special control mechanism.