CN107859583B - Pneumatic starting system of automobile engine - Google Patents

Abstract

An automobile engine pneumatic starting system belongs to the field of engine technology. The invention mainly includes a high-pressure gas cylinder, a throttle, an intake and exhaust passage, a valve, an intake camshaft, an exhaust camshaft, an intake rocker shaft, an intake rocker arm a, an intake rocker arm b, and an exhaust rocker arm. It consists of a shaft, an exhaust rocker arm a, an exhaust rocker arm b, etc.; when starting, the throttle valve is closed, the high-pressure gas bottle is connected to the intake passage, the high-pressure gas enters the cylinder and expands, pushing the piston downward to do work. At the same time, a double cam-double rocker valve control mechanism is adopted. When starting, the intake rocker arm a and the intake rocker arm b, and the exhaust rocker arm a and the exhaust rocker arm b are connected into one body under the action of hydraulic pressure to realize the intake ( work)-exhaust two-stroke working mode; under normal working conditions, the two intake rocker arms and the two exhaust rocker arms are separated from each other, and the engine returns to the four-stroke working mode. Through the invention, problems such as poor fuel economy and bad emissions during engine starting can be avoided, and the starting responsiveness can also be improved.

Description

A pneumatic starting system for automobile engines

Technical field

The invention belongs to the field of engine technology, and specifically relates to an engine pneumatic starting system.

Background technique

Vehicle emission regulations are becoming increasingly stringent, and automotive industry practitioners are working hard to find ways to reduce vehicle emission pollutants. At present, reducing emissions is mainly achieved by optimizing in-cylinder combustion and post-processing exhaust gas. However, when the engine is started, the temperature in the cylinder is low, the speed is low, and the lubricating oil and cooling water temperatures are not optimal. In order to make the engine start smoothly, methods such as enriching the mixture or increasing the amount of fuel injection are used to compensate for the combustion speed. insufficient. This will inevitably lead to incomplete fuel combustion, poor fuel economy, large amounts of hydrocarbons and particulate emissions, and serious pollution. Although the start-up condition of a single vehicle lasts very short and has a small impact, the emission problem during the start-up condition is very prominent and needs to be solved urgently in the context of the huge car population and congested urban road conditions that require frequent engine starts. At present, high-pressure air is widely used in automobiles, such as pneumatic braking systems, pneumatic doors, etc. Many cars have complete high-pressure gas storage and regeneration devices. On this basis, appropriate improvements can be made to apply high-pressure air to engine starting. The engine is started driven by high-pressure gas, which can effectively avoid some of the inherent problems of traditional engine starting methods. problem, significantly improve exhaust emissions, and achieve the goal of energy saving and emission reduction of automobiles.

Contents of the invention

The purpose of the present invention is to provide a pneumatic starting system for an automobile engine, which enables the automobile engine to be started through high-pressure air direct driving, thereby improving the responsiveness of the automobile engine starting conditions and the problem of emission deterioration.

A pneumatic starting system for automobile engines, which consists of a high-pressure gas cylinder 1, a solenoid valve 2, a throttle valve 3, an intake pipeline 4, an intake valve 5, an intake rocker arm a6, an intake rocker arm b7, and a locking pin hole a7- 1. Intake cam a8, intake camshaft 9, intake cam b10, intake rocker shaft 11, exhaust rocker shaft 12, exhaust cam a13, exhaust camshaft 14, exhaust cam b15, exhaust Rocker arm a16, exhaust rocker arm b17, locking pin hole b17-1, exhaust valve 18, exhaust pipe 19, cylinder 20, piston 21, spring a22, locking pin a23, plug a24, plug b25 , locking pin b26, spring b27, torsion spring a28, torsion spring b29.

The high-pressure gas cylinder 1, solenoid valve 2, throttle valve 3, intake pipeline 4, intake valve 5, intake rocker arm a6, intake rocker arm b7, intake cam a8, intake camshaft 9, intake Air cam b10, intake rocker arm shaft 11, exhaust rocker arm shaft 12, exhaust cam a13, exhaust camshaft 14, exhaust cam b15, exhaust rocker arm a16, exhaust rocker arm b17, exhaust valve 18 , exhaust pipe 19, cylinder 20, piston 21, spring a22, locking pin a23, plug a24, plug b25, locking pin b26, spring b27, torsion spring a28, torsion spring b29, wherein, the above The high-pressure gas cylinder 1, intake pipeline 4, cylinder 20, and exhaust pipeline 19 are connected; the solenoid valve 2 is arranged between the high-pressure gas cylinder 1 and the intake pipeline 4; the intake valve 5 is placed between the intake pipeline 4 and the cylinder 20; the exhaust valve 18 is placed between the exhaust pipe 19 and the cylinder 20; the throttle valve 3 is placed at the entrance end of the intake pipe 4; the intake cam a8 and the intake cam b10 are fixed to the intake camshaft 9 surface, the two have a phase angle difference of 180°; the exhaust cam a12 and the exhaust cam b13 are fixed on the surface of the exhaust camshaft b14, and they also have a phase angle difference of 180°; during operation, the intake cam a8 and the intake cam The top of arm a6 is slidingly connected, the intake cam b10 is slidingly connected with the top of intake rocker arm b7, the exhaust cam a13 is slidingly connected with the top of exhaust rocker arm a16, the exhaust cam b15 is slidingly connected with the top of exhaust rocker arm b17 ; One end of the intake rocker arm a6 is set on the intake rocker arm shaft 11, and the other end is placed on the top of the intake valve 5; one end of the intake rocker arm b7 is also set on the intake rocker arm shaft 11, and the other end is suspended in the air; One end of the air rocker arm a16 is set on the exhaust rocker arm shaft 12, and the other end is placed on the top of the exhaust valve 18; one end of the exhaust rocker arm b17 is also set on the exhaust rocker arm shaft 12, and the other end is placed in the air; the torsion spring a28 It is set on the outer surface of the intake rocker arm shaft 11, the fixed end is welded to the intake rocker arm shaft 11, and the force-bearing end is in sliding contact with the lower side of the intake rocker arm b7; the torsion spring b29 is set on the outer surface of the exhaust rocker arm shaft 12. The fixed end is welded to the exhaust rocker arm shaft 12, and the stressed end is in sliding contact with the lower side of the exhaust rocker arm b17; the base of the locking pin a23 and the locking pin b26 is a cylindrical structure, and the head is a round rod shape structure.

The intake rocker arm shaft a6 has an oil hole a6-1 and a stepped oil chamber a6-2. The locking pin a23 is placed in the stepped oil chamber a6-2, and the spring a22 is set on the locking pin a23 head. The stop is limited by the base of the locking pin a23 and the end face of the stepped oil chamber a6-2. The plug a24 is used to seal the stepped oil chamber a6-2 after installing the locking pin a23 and the spring a22, and is connected with the stepped oil chamber. The wall surface of a6-2 is threaded; the exhaust rocker arm a16 has an oil hole c16-1, a stepped oil chamber b16-2, a locking pin b26 is placed in the stepped oil chamber b16-2, and a spring b27 It is set on the head of the locking pin b26 and is limited by the base of the locking pin b26 and the end face of the stepped oil chamber b16-2. The plug b25 is used to install the locking pin b26 and the spring b27 and then seal the stepped oil chamber b16- 2. Threaded connection with the wall surface of the stepped oil chamber b16-2.

The intake rocker shaft 11 is processed with an oil passage a11-1 and an oil hole b11-2. The oil passage a11-1 is connected with the oil hole b11-2, the oil hole a6-1, and the stepped oil chamber a6-2; The intake rocker arm b7 has a locking pin hole a7-1, and the exhaust rocker arm b17 has a locking pin hole b17-1; the exhaust rocker arm shaft 12 is processed with an oil passage b12- 1. Oil hole d12-2, oil passage b12-1 are connected with oil hole d12-2, oil hole c16-1, and stepped oil chamber b16-2.

There is a locking pin hole a7-1 on the intake rocker arm b7. When the head of the locking pin a23 enters the locking pin hole a7-1, the intake rocker arm a6 and the intake rocker arm b7 are connected together; There is a locking pin hole b17-1 on the air rocker arm b17. When the head of the locking pin b26 enters the locking pin hole b17-1, the air intake rocker arm b16 and the air intake rocker arm b17 are connected together.

The working process of the device of the present invention is as follows:

When the engine is started: the throttle valve 3 is closed, the solenoid valve 2 is opened, and the high-pressure gas flows from the high-pressure cylinder 1 into the intake pipe 4 behind the throttle valve 3; for the four-stroke four-cylinder or six-cylinder automobile engines commonly used in the market, the engine Before starting, there must be a cylinder 20 in the intake stroke. At this time, the intake valve 5 is in an open state, the intake pipe 4 is connected to the cylinder 20, and the high-pressure air in the high-pressure cylinder 1 flows into the cylinder 20 through the intake pipe 4, and the expansion does work. , pushing the piston 21 downward, and the engine rotates. At the same time, oil passage a11-1 passes high-pressure oil into oil chamber a6-2 through oil hole b11-2 and oil hole a6-1, so that the hydraulic pressure on lock pin a23 is greater than the force of spring a22, and the lock The locking pin a23 moves toward the intake rocker arm b7. When the locking pin a23 faces the locking pin hole a7-1 in the intake rocker arm b7, the head of the locking pin a23 will enter the intake rocker arm b7. In the locking pin hole a7-1, the intake rocker arm a6 and the intake rocker arm b7 are connected into one body under the action of hydraulic pressure and locking pin a23. In this way, the intake valve 5 is not only affected by the intake cam a8, the intake rocker The direct drive of arm a6 will open during the cylinder intake stroke, and it will also be indirectly driven by the intake cam b10 and the intake rocker arm b7 to open during the cylinder expansion stroke. Both the intake stroke and the expansion stroke are the downward strokes of the piston. , that is, when starting the working state, the intake valve will open when the piston moves downward; and, the oil passage b12-1 passes high-pressure oil into the oil chamber b16-2 through the oil hole d12-2 and the oil hole c16-1, so that the lock The hydraulic force on the stop pin b26 is greater than the force of the spring b27, and the lock pin b26 moves toward the exhaust rocker arm b17. When the lock pin b26 is directly opposite to the lock pin hole b17-1 in the exhaust rocker arm b17 , the head of the locking pin b26 will enter the locking pin hole b17-1 in the exhaust rocker arm b17. The exhaust rocker arm a16 and the exhaust rocker arm b17 are connected into one body under the action of hydraulic pressure and locking pin b26. In this way, the exhaust valve 18 is not only directly driven by the exhaust cam a13 and the exhaust rocker arm a16 to open during the cylinder exhaust stroke, but is also indirectly driven by the exhaust cam b15 and the exhaust rocker arm b17 during the cylinder compression stroke. Also open, the exhaust stroke and compression stroke are both the upward strokes of the piston, that is, the exhaust valve will open when the piston moves upward during the starting working state; in this way, the valve opening pattern during the engine starting working condition is based on the conventional intake-compression-power -The exhaust four-stroke working mode is changed to the intake-exhaust two-stroke working mode, which can improve the power density of the cylinder 20 during the pneumatic starting process and improve the responsiveness of the engine pneumatic starting. When the high-pressure gas enters the cylinder 20 and expands to do work, pushing the piston 21 upward through its bottom dead center, the exhaust valve 18 opens, and the air after the work is discharged out of the cylinder through the exhaust pipe 19; when the piston 21 further moves downward through its top dead center , the intake valve 5 will open again, high-pressure air flows into the cylinder 20, expands and works, and pushes the piston 21 downward; after a few cycles, the engine can reach the target speed and the start-up is completed.

When the engine enters normal operation after starting: the solenoid valve 2 is closed, the high-pressure gas cylinder 1 is not connected to the intake passage 4, and high-pressure gas is no longer supplied; the oil passage a11-1 supplies oil to the oil through the oil hole b11-2 and the oil hole a6-1 Low-pressure oil is introduced into cavity a6-2. At this time, the pressure of the low-pressure oil is less than the force of spring a22. The locking pin a23 remains in the intake rocker arm a6. The intake rocker arm a6 and the intake rocker arm b7 are completely independent. Cam b10 drives the intake rocker arm b7 to idle, and is reset by the torsion spring a28, so that the intake cam b10 and the intake rocker arm b7 remain in close contact. The opening of the intake valve 5 is only affected by the intake cam a8 and the intake rocker arm. The drive of a6 is only opened during the intake stroke of cylinder 20; oil passage b12-1 passes low-pressure oil into oil chamber b16-2 through oil hole d12-2 and oil hole c16-1. At this time, the low-pressure oil pressure is less than the spring b27 acts, the locking pin b26 remains in the exhaust rocker arm a16, the exhaust rocker arm a16 is completely independent of the exhaust rocker arm b17, the exhaust cam b15 drives the exhaust rocker arm b17 to swing idle, and is reset by the torsion spring b29. The exhaust cam b15 and the exhaust rocker arm b17 are always kept in close contact. The opening of the exhaust valve 18 is only driven by the exhaust cam a13 and the exhaust rocker arm a16. It is only opened during the exhaust stroke of the cylinder 20, and the engine returns to the normal state. Intake-compression-power-exhaust four-stroke working mode, normal operation.

Compared with the prior art, the beneficial effects of the present invention are:

1. Using high-pressure gas to push the piston to start the engine can avoid problems such as poor engine fuel economy and poor emissions during the starting stage;

2. The pneumatic starting system proposed by the present invention can enable the engine to realize the intake-exhaust two-stroke working mode during starting conditions, with fast work during starting and good starting responsiveness;

3. Simple structure, easy to apply and low cost;

4. The system has strong applicability and there is no limit on the number of engine cylinders and valves.

Description of the drawings

Figure 1 is a schematic diagram of the system of the present invention

Figure 2 is a schematic structural diagram of the A-A cross-sectional view in Figure 1

Figure 3 is a schematic structural diagram of the B-B cross-sectional view in Figure 1

Figure 4 is a schematic structural diagram of the C-C cross-sectional view in Figure 1

Figure 5 is a schematic structural diagram of the D-D cross-sectional view in Figure 1

Figure 6 is a schematic diagram of the intake camshaft of the present invention.

Figure 7 is a diagram showing the relationship between cylinder stroke and crankshaft angle of a 4-cylinder engine.

Figure 8 is a diagram showing the relationship between cylinder stroke and crankshaft angle of a 6-cylinder engine.

Among them, 1. High-pressure gas cylinder, 2. Solenoid valve, 3. Throttle valve, 4. Intake pipeline, 5. Intake valve, 6. Intake rocker arm a, 6-1. Oil hole a, 6-2. Oil Cavity a, 7. Intake rocker arm b, 7-1. Locking pin hole a, 8. Intake cam a, 9. Intake camshaft, 10. Intake cam b, 11. Intake rocker arm shaft, 11-1. Oil passage a, 11-2. Oil hole b, 12. Exhaust rocker shaft, 12-1. Oil passage b, 12-2. Oil hole d, 13. Exhaust cam a, 14. Discharge Air camshaft, 15. Exhaust cam b, 16. Exhaust rocker arm a, 16-1. Oil hole c, 16-2. Oil chamber b, 17. Exhaust rocker arm b, 17-1. Locking pin Hole b, 18. Exhaust valve, 19. Exhaust pipe, 20. Cylinder, 21. Piston, 22. Spring a, 23. Locking pin a, 24. Plug a, 25. Plug b, 26. Locking pin b, 27. Spring b, 28. Torsion spring a, 29. Torsion spring b

Detailed ways

The present invention will be described in detail below in conjunction with accompanying drawings 1-7:

The present invention will be described in detail below with reference to accompanying drawings 1-6:

Refer to Figure 1-Figure 6:

The invention consists of a high-pressure gas cylinder 1, a solenoid valve 2, a throttle valve 3, an intake pipeline 4, an intake valve 5, an intake rocker arm a6, an intake rocker arm b7, an intake cam a8, an intake camshaft 9, an intake Air cam b10, intake rocker arm shaft 11, exhaust rocker arm shaft 12, exhaust cam a13, exhaust camshaft 14, exhaust cam b15, exhaust rocker arm a16, exhaust rocker arm b17, exhaust valve 18 , exhaust pipe 19, cylinder 20, piston 21, spring a22, locking pin a23, plug a24, plug b25, locking pin b26, spring b27, torsion spring a28, torsion spring b29;

Refer to Figure 1:

1. High-pressure gas cylinder 1, intake pipeline 4, cylinder 20, and exhaust pipeline 19 are connected; solenoid valve 2 is arranged between high-pressure gas cylinder 1 and intake pipeline 4; intake valve 5 is placed between intake pipeline 4 and between the cylinders 20; the exhaust valve 18 is placed between the exhaust pipe 19 and the cylinder 20; the throttle valve 3 is placed at the entrance end of the intake pipe 4;

The intake cam a8 is in sliding connection with the top of the intake rocker arm a6, and the intake cam b10 is in sliding connection with the top of the intake rocker arm b7;

One end of the intake rocker arm a6 is set on the intake rocker arm shaft 11, and the other end is placed on the top of the intake valve 5; one end of the intake rocker arm b7 is also set on the intake rocker arm shaft 11, and the other end is placed in the air. ;

The exhaust cam a13 is in sliding contact with the top of the exhaust rocker arm a16, and the exhaust cam b15 is in sliding contact with the top of the exhaust rocker arm b17;

One end of the exhaust rocker arm a16 is mounted on the exhaust rocker arm shaft 12, and the other end is placed on the top of the exhaust valve 18; one end of the exhaust rocker arm b17 is also mounted on the exhaust rocker arm shaft 12, and the other end is suspended in the air. ;

Refer to attached picture 2:

The intake rocker shaft 11 is processed with an oil passage a11-1 and an oil hole b11-2. The oil passage a11-1 is connected with the oil hole b11-2, the oil hole a6-1, and the stepped oil chamber a6-2;

The intake rocker arm a6 has an oil hole a6-1 and a stepped oil chamber a6-2. The locking pin a23 is placed in the stepped oil chamber a6-2, and the spring a22 is set on the head of the locking pin a23. , limited by the base of the locking pin a23 and the end face of the stepped oil chamber a6-2, the plug a24 is used to install the locking pin a23 and the spring a22 to seal the stepped oil chamber a6-2, and the stepped oil chamber a6 -2 wall threaded connection;

The base of the locking pin a23 is a cylindrical structure, and the head is a circular rod-shaped structure;

Refer to attached picture 3:

There is a locking pin hole a7-1 on the intake rocker arm b7. When the head of the locking pin a23 enters the locking pin hole a7-1, the intake rocker arm a6 and the intake rocker arm b7 are connected together;

The torsion spring a28 is set on the outer surface of the intake rocker arm shaft 11, the fixed end is welded to the intake rocker arm shaft 11, and the force-bearing end is in sliding contact with the lower side of the intake rocker arm b7;

Refer to attached figure 4:

The exhaust rocker shaft 12 is processed with an oil passage b12-1 and an oil hole d12-2. The oil passage b11-1 is connected with the oil hole d11-2, the oil hole c16-1 and the stepped oil chamber b16-2;

The exhaust rocker arm a16 has an oil hole c16-1 and a stepped oil chamber b16-2. The locking pin b26 is placed in the stepped oil chamber b16-2, and the spring b27 is set on the head of the locking pin b26. , limited by the base of the locking pin b26 and the end face of the stepped oil chamber b16-2. The plug b25 is used to install the locking pin b26 and the spring b27 to seal the stepped oil chamber b16-2 and the stepped oil chamber b16. -2 wall thread connection;

The base of the locking pin b26 is a cylindrical structure, and the head is a circular rod-shaped structure;

Refer to Figure 5:

There is a locking pin hole b17-1 on the exhaust rocker arm b17. When the head of the locking pin b26 enters the locking pin hole b17-1, the intake rocker arm b16 and the intake rocker arm b17 are connected together;

The torsion spring b29 is set on the outer surface of the exhaust rocker arm shaft 12, the fixed end is welded to the exhaust rocker arm shaft 12, and the force-bearing end is in sliding contact with the lower side of the exhaust rocker arm b17;

Refer to Figure 6:

The intake cam a8 drives the intake rocker arm a6, the intake cam b10 drives the intake rocker arm b7, the intake cam a8 and the intake cam b10 are fixed on the surface of the intake camshaft 9, and the two are 180° out of phase. horn;

Refer to attached figure 7:

For a common four-cylinder four-stroke engine on the market, taking the firing order of 1-3-4-2 as an example, although the four cylinders 20 may be in different strokes before the engine is started, there must be one cylinder 20 in the advanced state. During the air stroke, the intake valve 5 is in an open state. When the engine needs to be started, after the solenoid valve 2 is opened, the high-pressure gas in the high-pressure cylinder 1 will flow into the cylinder 20 to expand and perform work, causing the engine to start rotating;

Refer to Figure 8:

For a common six-cylinder four-stroke engine on the market, taking the firing sequence as 1-5-3-6-2-4 as an example, the engine will have one or more cylinders 20 in the intake stroke, and its intake valve 5 is open state. When the engine needs to be started, after the solenoid valve 2 is opened, the high-pressure gas in the high-pressure cylinder 1 will flow into the cylinder 20 to expand and perform work, causing the engine to start rotating.

Combined with the relationship between the components of the device of the present invention and their installation positions, the technical solution of the engine variable valve timing mechanism is as follows:

The specific working process of the device of the present invention can be divided into the following two situations:

The specific working process of the device of the present invention can be divided into the following two situations:

When the engine is started: the throttle valve 3 is closed, the solenoid valve 2 is opened, and the high-pressure gas flows from the high-pressure cylinder 1 into the intake pipe 4 behind the throttle valve 3; for the four-stroke four-cylinder or six-cylinder automobile engines commonly used in the market, the engine Before starting, there must be a cylinder 20 in the intake stroke. At this time, the intake valve 5 is in an open state, the intake pipe 4 is connected to the cylinder 20, and the high-pressure air in the high-pressure cylinder 1 flows into the cylinder 20 through the intake pipe 4, and the expansion does work. , pushing the piston 21 downward, and the engine rotates. At the same time, oil passage a11-1 passes high-pressure oil into oil chamber a6-2 through oil hole b11-2 and oil hole a6-1, so that the hydraulic pressure on lock pin a23 is greater than the force of spring a22, and the lock The locking pin a23 moves toward the intake rocker arm b7. When the locking pin a23 faces the locking pin hole a7-1 in the intake rocker arm b7, the head of the locking pin a23 will enter the intake rocker arm b7. In the locking pin hole a7-1, the intake rocker arm a6 and the intake rocker arm b7 are connected into one body under the action of hydraulic pressure and locking pin a23. In this way, the intake valve 5 is not only affected by the intake cam a8, the intake rocker The direct drive of arm a6 will open during the cylinder intake stroke, and it will also be indirectly driven by the intake cam b10 and the intake rocker arm b7 to open during the cylinder expansion stroke. Both the intake stroke and the expansion stroke are the downward strokes of the piston. , that is, when starting the working state, the intake valve will open when the piston moves downward; and, the oil passage b12-1 passes high-pressure oil into the oil chamber b16-2 through the oil hole d12-2 and the oil hole c16-1, so that the lock The hydraulic force on the stop pin b26 is greater than the force of the spring b27, and the lock pin b26 moves toward the exhaust rocker arm b17. When the lock pin b26 is directly opposite to the lock pin hole b17-1 in the exhaust rocker arm b17 , the head of the locking pin b26 will enter the locking pin hole b17-1 in the exhaust rocker arm b17. The exhaust rocker arm a16 and the exhaust rocker arm b17 are connected into one body under the action of hydraulic pressure and locking pin b26. In this way, the exhaust valve 18 is not only directly driven by the exhaust cam a13 and the exhaust rocker arm a16 to open during the cylinder exhaust stroke, but is also indirectly driven by the exhaust cam b15 and the exhaust rocker arm b17 during the cylinder compression stroke. Also open, the exhaust stroke and compression stroke are both the upward strokes of the piston, that is, the exhaust valve will open when the piston moves upward during the starting working state; in this way, the valve opening pattern during the engine starting working condition is from the conventional intake-compression-power -The exhaust four-stroke working mode is changed to the intake-exhaust two-stroke working mode, which can improve the power density of the cylinder 20 during the pneumatic starting process and improve the responsiveness of the engine pneumatic starting. When the high-pressure gas enters the cylinder 20 and expands to do work, pushing the piston 21 upward through its bottom dead center, the exhaust valve 18 opens, and the air after the work is discharged out of the cylinder through the exhaust pipe 19; when the piston 21 further moves downward through its top dead center , the intake valve 5 will open again, high-pressure air flows into the cylinder 20, expands to do work, and pushes the piston 21 downward; after a few cycles, the engine can reach the target speed and the start-up is completed.

When the engine enters normal operation after starting: the solenoid valve 2 is closed, the high-pressure gas cylinder 1 is not connected to the intake passage 4, and high-pressure gas is no longer supplied; the oil passage a11-1 supplies oil to the oil through the oil hole b11-2 and the oil hole a6-1 Low-pressure oil is introduced into cavity a6-2. At this time, the pressure of the low-pressure oil is less than the force of spring a22. The locking pin a23 remains in the intake rocker arm a6. The intake rocker arm a6 and the intake rocker arm b7 are completely independent. Cam b10 drives the intake rocker arm b7 to idle, and is reset by the torsion spring a28, so that the intake cam b10 and the intake rocker arm b7 remain in close contact. The opening of the intake valve 5 is only affected by the intake cam a8 and the intake rocker arm. The drive of a6 is only opened during the intake stroke of cylinder 20; oil passage b12-1 passes low-pressure oil into oil chamber b16-2 through oil hole d12-2 and oil hole c16-1. At this time, the low-pressure oil pressure is less than the spring b27 acts, the locking pin b26 remains in the exhaust rocker arm a16, the exhaust rocker arm a16 is completely independent of the exhaust rocker arm b17, the exhaust cam b15 drives the exhaust rocker arm b17 to swing idle, and is reset by the torsion spring b29. The exhaust cam b15 and the exhaust rocker arm b17 are always kept in close contact. The opening of the exhaust valve 18 is only driven by the exhaust cam a13 and the exhaust rocker arm a16. It is only opened during the exhaust stroke of the cylinder 20, and the engine returns to the normal state. Intake-compression-power-exhaust four-stroke working mode, normal operation.

Claims (4)

1. A pneumatic starting system of an automobile engine comprises a high-pressure gas cylinder (1), an electromagnetic valve (2), a throttle valve (3), an air inlet pipeline (4), an air inlet valve (5), an air inlet rocker arm a (6), an air inlet rocker arm b (7), an air inlet cam a (8), an air inlet cam shaft (9), an air inlet cam b (10), an air inlet rocker arm shaft (11), an air outlet rocker arm shaft (12), an air outlet cam a (13), an air outlet cam shaft (14), an air outlet cam b (15), an air outlet rocker arm a (16), an air outlet rocker arm b (17), an air outlet valve (18), an air outlet pipeline (19), a cylinder (20), a piston (21), a spring a (22), a locking pin a (23), a plug a (24), a plug b (25), a locking pin b (26), a spring b (27), a torsion spring a (28) and a torsion spring b (29), wherein the high-pressure gas cylinder (1), the air inlet pipeline (4), the cylinder (20) and the air outlet pipeline (19) are communicated; the electromagnetic valve (2) is arranged between the high-pressure gas cylinder (1) and the air inlet pipeline (4); the intake valve (5) is arranged between the intake pipeline (4) and the cylinder (20); the exhaust valve (18) is arranged between the exhaust pipeline (19) and the cylinder (20); the throttle valve (3) is arranged at the inlet end of the air inlet pipeline (4); the air inlet cam a (8) and the air inlet cam b (10) are fixedly connected to the surface of the air inlet cam shaft (9), and the two are 180-degree phase angle difference; the exhaust cam a (12) and the exhaust cam b (13) are fixedly connected to the surface of the exhaust cam b (14), and the two are also different by 180 DEG phase angle; when the device works, the air inlet cam a (8) is in sliding connection with the top end of the air inlet rocker arm a (6), the air inlet cam b (10) is in sliding connection with the top end of the air inlet rocker arm b (7), the exhaust cam a (13) is in sliding connection with the top end of the exhaust rocker arm a (16), and the exhaust cam b (15) is in sliding connection with the top end of the exhaust rocker arm b (17); one end of an air inlet rocker arm a (6) is sleeved on an air inlet rocker arm shaft (11), and the other end of the air inlet rocker arm a is arranged at the top end of an air inlet valve (5); one end of the air inlet rocker arm b (7) is also sleeved on the air inlet rocker arm shaft (11), and the other end is suspended; one end of an exhaust rocker arm a (16) is sleeved on the exhaust rocker arm shaft (12), and the other end of the exhaust rocker arm a is arranged at the top end of an exhaust valve (18); one end of the exhaust rocker arm b (17) is also sleeved on the exhaust rocker arm shaft (12), and the other end is suspended; the torsion spring a (28) is sleeved on the outer surface of the air inlet rocker arm shaft (11), the fixed end of the torsion spring a is welded on the air inlet rocker arm shaft (11), and the stress end of the torsion spring a is in sliding contact with the lower side of the air inlet rocker arm b (7); the torsion spring b (29) is sleeved on the outer surface of the exhaust rocker arm shaft (12), the fixed end of the torsion spring b is welded on the exhaust rocker arm shaft (12), and the stress end of the torsion spring b is in sliding contact with the lower side of the exhaust rocker arm b (17); the bases of the locking pin a (23) and the locking pin b (26) are of cylindrical structures, and the heads of the locking pins are of round rod-shaped structures.

2. The pneumatic starting system of the automobile engine according to claim 1, wherein the air inlet rocker arm a (6) is provided with an oil hole a (6-1) and a stepped oil cavity a (6-2), the locking pin a (23) is arranged in the stepped oil cavity a (6-2), the spring a (22) is sleeved on the head of the locking pin a (23), the base of the locking pin a (23) is limited by the end face of the stepped oil cavity a (6-2), and the plug a (24) is used for installing the locking pin a (23) and the spring a (22) to seal the stepped oil cavity a (6-2) and is in threaded connection with the wall surface of the stepped oil cavity a (6-2); the exhaust rocker arm a (16) is provided with an oil hole c (16-1) and a stepped oil cavity b (16-2), the locking pin b (26) is arranged in the stepped oil cavity b (16-2), the spring b (27) is sleeved on the head of the locking pin b (26), the base of the locking pin b (26) is limited with the end face of the stepped oil cavity b (16-2), and the plug b (25) is used for installing the locking pin b (26) and the spring b (27) to seal the stepped oil cavity b (16-2) and is in threaded connection with the wall face of the stepped oil cavity b (16-2).

3. The pneumatic starting system of the automobile engine according to claim 1, wherein the intake rocker shaft (11) is provided with an oil passage a (11-1) and an oil hole b (11-2), and the oil passage a (11-1) is communicated with the oil hole b (11-2), the oil hole a (6-1) and the stepped oil cavity a (6-2); the exhaust rocker shaft (12) is provided with an oil duct b (12-1) and an oil hole d (12-2), and the oil duct b (12-1) is communicated with the oil hole d (12-2), the oil hole c (16-1) and the stepped oil cavity b (16-2).

4. A pneumatic starting system for an automobile engine according to claim 1, wherein the air intake rocker arm b (7) is provided with a locking pin hole a (7-1), and the air intake rocker arm a (6) and the air intake rocker arm b (7) are connected into a whole when the head of the locking pin a (23) enters the locking pin hole a (7-1); the exhaust rocker arm b (17) is provided with a locking pin hole b (17-1), and when the head of the locking pin b (26) enters the locking pin hole b (17-1), the air inlet rocker arm b (16) and the air inlet rocker arm b (17) are connected into a whole.