CN107859583B - Pneumatic starting system of automobile engine - Google Patents
Pneumatic starting system of automobile engine Download PDFInfo
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- CN107859583B CN107859583B CN201711270418.4A CN201711270418A CN107859583B CN 107859583 B CN107859583 B CN 107859583B CN 201711270418 A CN201711270418 A CN 201711270418A CN 107859583 B CN107859583 B CN 107859583B
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- rocker arm
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- locking pin
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N9/00—Starting of engines by supplying auxiliary pressure fluid to their working chambers
- F02N9/04—Starting of engines by supplying auxiliary pressure fluid to their working chambers the pressure fluid being generated otherwise, e.g. by compressing air
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- Valve Device For Special Equipments (AREA)
Abstract
A pneumatic starting system of an automobile engine belongs to the technical field of engines. The invention mainly comprises a high-pressure gas cylinder, a throttle valve, an air inlet and outlet passage, an air valve, an air inlet cam shaft, an air outlet cam shaft, an air inlet rocker arm a, an air inlet rocker arm b, an air outlet rocker arm shaft, an air outlet rocker arm a, an air outlet rocker arm b and the like; when the engine is started, the throttle valve is closed, the high-pressure gas cylinder is communicated with the air inlet channel, and the high-pressure gas enters the cylinder to expand so as to push the piston to do work downwards. Meanwhile, a double-cam-double-rocker valve control mechanism is adopted, and an air inlet rocker arm a, an air inlet rocker arm b, an exhaust rocker arm a and an exhaust rocker arm b are connected into a whole under the hydraulic action during starting, so that an air inlet (acting) -exhaust two-stroke working mode is realized; when the engine works under the normal working condition, the two air inlet rocker arms and the two air outlet rocker arms are mutually separated, and the engine restores to a four-stroke working mode. The invention can avoid the problems of poor fuel economy, bad emission and the like in the engine starting stage, and can improve the starting response.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to a pneumatic starting system of an engine.
Background
Automobile emission regulations are increasingly stringent and practitioners in the automotive industry are striving to find ways to reduce automobile emission pollutants. At present, the emission reduction is mainly realized by optimizing in-cylinder combustion and performing post-treatment on tail gas. However, the temperature in the cylinder is low, the rotating speed is low, the temperature of lubricating oil and cooling water is not optimal, and in order to enable the engine to start smoothly, the method of adding rich mixture or increasing the oil injection quantity is adopted to make up the defect of the combustion speed. Therefore, incomplete fuel combustion, poor fuel economy, large emission of hydrocarbon and particles in the emission and serious pollution are inevitably caused. Although the duration of the starting working condition of a single vehicle is short, the influence caused by the starting working condition is small, the emission problem of the starting working condition is very prominent under the background that the engine is required to be frequently started under the huge automobile storage quantity and the congested urban road condition, and the problem is needed to be solved. Currently, high pressure air has become very popular for use in automobiles, such as pneumatic brake systems, pneumatic doors, and the like. Many automobiles are provided with complete high-pressure gas storage and regeneration devices, and are properly improved on the basis, high-pressure air is applied to engine starting, and the engine is started under the drive of the high-pressure gas, so that some inherent problems of the traditional starting mode of the engine can be effectively avoided, the exhaust emission is obviously improved, and the purposes of energy conservation and emission reduction of the automobiles are achieved.
Disclosure of Invention
The invention aims to provide a pneumatic starting system of an automobile engine, which is used for starting the automobile engine in a high-pressure air direct driving mode and improving the problems of responsiveness and emission deterioration of starting working conditions of the automobile engine.
A pneumatic starting system of an automobile engine comprises a high-pressure gas cylinder 1, a solenoid valve 2, a throttle valve 3, an air inlet pipeline 4, an air inlet valve 5, an air inlet rocker arm a6, an air inlet rocker arm b7, a locking pin hole a7-1, an air inlet cam a8, an air inlet cam shaft 9, an air inlet cam b10, an air inlet rocker arm shaft 11, an air outlet rocker arm shaft 12, an air outlet cam a13, an air outlet cam shaft 14, an air outlet cam b15, an air outlet rocker arm a16, an air outlet rocker arm b17, a locking pin hole b17-1, an air outlet valve 18, an air outlet pipeline 19, a cylinder 20, a piston 21, a spring a22, a locking pin a23, a plug a24, a plug b25, a locking pin b26, a spring b27, a torsion spring a28 and a torsion spring b 29.
The high-pressure gas cylinder 1, the electromagnetic valve 2, the throttle valve 3, the gas inlet pipeline 4, the gas inlet valve 5, the gas inlet rocker arm a6, the gas inlet rocker arm b7, the gas inlet cam a8, the gas inlet cam shaft 9, the gas inlet cam b10, the gas inlet rocker arm shaft 11, the gas outlet rocker arm shaft 12, the gas outlet cam a13, the gas outlet cam shaft 14, the gas outlet cam b15, the gas outlet rocker arm a16, the gas outlet rocker arm b17, the gas outlet valve 18, the gas outlet pipeline 19, the gas cylinder 20, the piston 21, the spring a22, the locking pin a23, the plug a24, the plug b25, the locking pin b26, the spring b27, the torsion spring a28 and the torsion spring b29 are communicated, wherein the high-pressure gas cylinder 1, the gas inlet pipeline 4, the gas cylinder 20 and the gas outlet pipeline 19; the electromagnetic valve 2 is arranged between the high-pressure gas cylinder 1 and the gas 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 a8 and the air inlet cam b10 are fixedly connected to the surface of the air inlet cam shaft 9, and the two are different by 180 DEG phase angle; the exhaust cam a12 and the exhaust cam b13 are fixedly connected to the surface of the exhaust cam shaft b14, and the two are also different by 180 DEG phase angle; when the device works, the top end of the air inlet rocker arm a6 is in sliding connection with the air inlet cam a8, the top end of the air inlet rocker arm b7 is in sliding connection with the air inlet cam b10, the top end of the air outlet cam a13 is in sliding connection with the top end of the air outlet rocker arm a16, and the top end of the air outlet cam b15 and the top end of the air outlet rocker arm b17 are in sliding connection; one end of an air inlet rocker arm a6 is sleeved on an air inlet rocker arm shaft 11, and the other end of the air inlet rocker arm a6 is arranged at the top end of an air inlet valve 5; one end of the air inlet rocker arm b7 is also sleeved on the air inlet rocker arm shaft 11, and the other end is suspended; one end of the exhaust rocker arm a16 is sleeved on the exhaust rocker arm shaft 12, and the other end is arranged at the top end of the exhaust valve 18; one end of the exhaust rocker arm b17 is also sleeved on the exhaust rocker arm shaft 12, and the other end is suspended; the torsion spring a28 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 b29 is sleeved on the outer surface of the exhaust rocker arm shaft 12, the fixed end of the torsion spring b29 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 a23 and the locking pin b26 are cylindrical structures, and the heads are circular rod-shaped structures.
The air inlet rocker shaft a6 is provided with an oil hole a6-1 and a stepped oil cavity a6-2, a locking pin a23 is arranged in the stepped oil cavity a6-2, a spring a22 is sleeved at the head of the locking pin a23, the base of the locking pin a23 is limited by the end face of the stepped oil cavity a6-2, and a plug a24 is used for installing the locking pin a23 and the spring a22 and then sealing the stepped oil cavity a6-2 and is in threaded connection with the wall surface of the stepped oil cavity a 6-2; the exhaust rocker arm a16 is provided with an oil hole c16-1 and a stepped oil cavity b16-2, the locking pin b26 is arranged in the stepped oil cavity b16-2, the spring b27 is sleeved on the head of the locking pin b26, the base of the locking pin b26 is limited with the end face of the stepped oil cavity b16-2, and the plug b25 is used for installing the locking pin b26 and the spring b27 and then sealing the stepped oil cavity b16-2 and is in threaded connection with the wall face of the stepped oil cavity b 16-2.
The air inlet rocker arm shaft 11 is provided with an oil duct a11-1 and an oil hole b11-2, and the oil duct a11-1 is communicated with the oil hole b11-2, the oil hole a6-1 and the stepped oil cavity a 6-2; the air inlet rocker arm b7 is provided with a locking pin hole a7-1, and the air outlet rocker arm b17 is provided with a locking pin hole b17-1; the exhaust rocker arm shaft 12 is provided with an oil passage b12-1 and an oil hole d12-2, and the oil passage b12-1 is communicated with the oil hole d12-2, the oil hole c16-1 and the stepped oil cavity b 16-2.
The air inlet rocker arm b7 is provided with a locking pin hole a7-1, and when the head of the locking pin a23 enters the locking pin hole a7-1, the air inlet rocker arm a6 and the air inlet rocker arm b7 are connected into a whole; the exhaust rocker arm b17 is provided with a locking pin hole b17-1, and 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 into a whole.
The working process of the device is as follows:
when the engine is started to work, the following steps are carried out: the throttle valve 3 is closed, the electromagnetic valve 2 is opened, and high-pressure gas flows into the air inlet pipeline 4 behind the throttle valve 3 from the high-pressure gas cylinder 1; for the four-stroke four-cylinder or six-cylinder automobile engine commonly used in the market at present, the cylinder 20 is necessarily in the air inlet stroke before the engine is started, the air inlet valve 5 is in an open state at the moment, the air inlet pipeline 4 is communicated with the cylinder 20, high-pressure air in the high-pressure air cylinder 1 flows into the cylinder 20 through the air inlet pipeline 4, expansion work is done, the piston 21 is pushed to move downwards, and the engine rotates. Meanwhile, the oil duct a11-1 is filled with high-pressure oil into the oil cavity a6-2 through the oil hole b11-2 and the oil hole a6-1, so that the hydraulic force borne by the locking pin a23 is larger than the acting force of the spring a22, the locking pin a23 moves towards the direction of the air inlet rocker arm b7, when the locking pin a23 is aligned with the locking pin hole a7-1 in the air inlet rocker arm b7, the head of the locking pin a23 can enter the locking pin hole a7-1 in the air inlet rocker arm b7, the air inlet rocker arm a6 and the air inlet rocker arm b7 are connected into a whole under the action of the hydraulic pressure and the locking pin a23, and therefore, the air inlet valve 5 is opened in the air inlet stroke of the cylinder under the direct drive of the air inlet cam a8 and the air inlet rocker arm a6, and is also opened in the air cylinder expansion stroke under the indirect drive of the air inlet cam b10 and the air inlet rocker arm b7, and the air inlet valve is opened in the descending stroke of the piston when the piston is in the starting working state; the oil duct b12-1 is communicated with high-pressure oil into the oil cavity b16-2 through the oil hole d12-2 and the oil hole c16-1, so that hydraulic force borne by the locking pin b26 is larger than acting force of the spring b27, the locking pin b26 moves towards the direction of the exhaust rocker arm b17, when the locking pin b26 is aligned with the locking pin hole b17-1 in the exhaust rocker arm b17, the head of the locking pin b26 can 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 a whole under the action of hydraulic pressure and the locking pin b26, and therefore, the exhaust valve 18 is opened in an exhaust stroke of a cylinder under the direct drive of the exhaust cam a13 and the exhaust rocker arm a16, and is also opened in the compression stroke of the cylinder under the indirect drive of the exhaust cam b15 and the exhaust rocker arm b17, and the exhaust valve is opened in the upward stroke of a piston when the piston is in a starting working state; therefore, the valve opening rule in the starting working condition of the engine is changed from the conventional air inlet-compression-acting-exhaust four-stroke working mode to the air inlet-exhaust two-stroke working mode, the acting density of the cylinder 20 in the pneumatic starting process can be improved, and the response of the pneumatic starting of the engine can be improved. When the high-pressure gas enters the cylinder 20 to expand and do work, the piston 21 is pushed to pass through the upper dead point of the piston, the exhaust valve 18 is opened, and the air after doing work is discharged out of the cylinder through the exhaust pipeline 19; when the piston 21 further passes through the upper dead center of the piston, the air inlet valve 5 is opened again, high-pressure air flows into the air cylinder 20, expansion works, and the piston 21 is pushed to move downwards; the engine can reach the target rotating speed after a plurality of cycles, and the starting is completed.
When the engine enters normal operation after starting: the electromagnetic valve 2 is closed, the high-pressure gas cylinder 1 is not communicated with the air inlet channel 4, and high-pressure gas is not supplied any more; the oil duct a11-1 is used for introducing low-pressure oil into the oil cavity a6-2 through the oil hole b11-2 and the oil hole a6-1, the pressure of the low-pressure oil is smaller than the acting force of the spring a22 at the moment, the locking pin a23 is remained in the air inlet rocker arm a6, the air inlet rocker arm a6 is completely independent of the air inlet rocker arm b7, the air inlet cam b10 drives the air inlet rocker arm b7 to swing empty, the torsion spring a28 resets, the air inlet cam b10 and the air inlet rocker arm b7 are always kept in contact, and the opening of the air inlet valve 5 is only driven by the air inlet cam a8 and the air inlet rocker arm a6 and is only opened when the air cylinder 20 enters an air stroke; the oil duct b12-1 is used for introducing low-pressure oil into the oil cavity b16-2 through the oil hole d12-2 and the oil hole c16-1, the pressure of the low-pressure oil is smaller than the acting force of the spring b27 at the moment, the locking pin b26 is remained in the exhaust rocker arm a16, the exhaust rocker arm a16 and the exhaust rocker arm b17 are completely independent, the exhaust cam b15 drives the exhaust rocker arm b17 to swing empty, the torsion spring b29 resets, the exhaust cam b15 and the exhaust rocker arm b17 are always kept in contact, the exhaust valve 18 is opened only by the driving of the exhaust cam a13 and the exhaust rocker arm a16, the engine is opened only when the exhaust stroke of the cylinder 20 is carried out, and the engine is restored to an air inlet-compression-acting-exhaust four-stroke working mode and normally works.
Compared with the prior art, the invention has the beneficial effects that:
1. the engine is started by pushing the piston by high-pressure gas, so that the problems of poor fuel economy, poor emission and the like of the engine in the starting stage can be avoided;
2. the pneumatic starting system provided by the invention can realize an air inlet-exhaust two-stroke working mode of the engine under the starting working condition, and has the advantages of quick acting and good starting response during starting;
3. the structure is simple, the application is easy, and the cost is low;
4. the system has strong applicability and has no limit to the number of the engine cylinders and the number of the valves.
Drawings
FIG. 1 is a schematic diagram of a system of the present invention
FIG. 2 is a schematic view of the structure of the cross-section A-A of FIG. 1
FIG. 3 is a schematic view of the structure of the B-B cross-section in FIG. 1
FIG. 4 is a schematic view of the structure of the C-C cross-section in FIG. 1
FIG. 5 is a schematic view of the structure of the D-D cross-section in FIG. 1
FIG. 6 is a schematic view of an intake camshaft according to the present invention
FIG. 7 is a graph showing the relationship between cylinder stroke and crank angle of a 4-cylinder machine
FIG. 8 is a graph of cylinder travel versus crank angle for a 6-cylinder machine
The engine includes a high pressure cylinder, 2, a solenoid valve, 3, a throttle, 4, an intake pipe, 5, an intake valve, 6-1, an oil hole a, 6-2, an oil cavity a, 7, an intake rocker arm b, 7-1, a locking pin hole a, 8, an intake cam a, 9, an intake camshaft, 10, an intake cam b, 11-1, an oil hole a, 11-2, an oil hole b, 12-1, an oil hole b, 12-2, an oil hole d, 13, an exhaust cam a, 14, an exhaust camshaft, 15, an exhaust cam b, 16-1, an oil hole c, 16-2, an oil hole b, 17-1, a locking pin hole b, 18, an exhaust valve, 19, an exhaust pipe, 20, a cylinder, 21, a piston, 22, spring a, 23, a locking pin a, 24, plug a, 25, b, 26, a locking pin b, 27, spring b, 28, torsion spring a, 29
Detailed Description
The invention is described in detail below with reference to fig. 1-7:
the invention is described in detail below with reference to fig. 1-6:
referring to fig. 1-6:
the invention is composed of 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 a6, an air inlet rocker arm b7, an air inlet cam a8, an air inlet cam shaft 9, an air inlet cam b10, an air inlet rocker arm shaft 11, an air outlet rocker arm shaft 12, an air outlet cam a13, an air outlet cam shaft 14, an air outlet cam b15, an air outlet rocker arm a16, an air outlet rocker arm b17, an air outlet valve 18, an air outlet pipeline 19, a cylinder 20, a piston 21, a spring a22, a locking pin a23, a plug a24, a plug b25, a locking pin b26, a spring b27, a torsion spring a28 and a torsion spring b 29;
referring to fig. 1:
1. the high-pressure gas cylinder 1, the gas inlet pipeline 4, the gas cylinder 20 and the gas exhaust pipeline 19 are communicated; the electromagnetic valve 2 is arranged between the high-pressure gas cylinder 1 and the gas 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 a8 is in sliding connection with the top end of the air inlet rocker arm a6, and the air inlet cam b10 is in sliding connection with the top end of the air inlet rocker arm b 7;
one end of the air inlet rocker arm a6 is sleeved on the air inlet rocker arm shaft 11, and the other end of the air inlet rocker arm a6 is arranged at the top end of the air inlet valve 5; one end of the air inlet rocker arm b7 is also sleeved on the air inlet rocker arm shaft 11, and the other end is suspended;
the exhaust cam a13 is in sliding connection with the top end of the exhaust rocker arm a16, and the top end of the exhaust cam b15 and the top end of the exhaust rocker arm b17 are in sliding connection;
one end of the exhaust rocker arm a16 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 the exhaust valve 18; one end of the exhaust rocker arm b17 is also sleeved on the exhaust rocker arm shaft 12, and the other end is suspended;
referring to fig. 2:
the air inlet rocker arm shaft 11 is provided with an oil duct a11-1 and an oil hole b11-2, and the oil duct a11-1 is communicated with the oil hole b11-2, the oil hole a6-1 and the stepped oil cavity a 6-2;
the air inlet rocker arm a6 is provided with an oil hole a6-1 and a stepped oil cavity a6-2, a locking pin a23 is arranged in the stepped oil cavity a6-2, a spring a22 is sleeved at the head of the locking pin a23, the base of the locking pin a23 is limited by the end face of the stepped oil cavity a6-2, and a plug a24 is used for installing the locking pin a23 and the spring a22 and then sealing the stepped oil cavity a6-2 and is in threaded connection with the wall surface of the stepped oil cavity a 6-2;
the base of the locking pin a23 is of a cylindrical structure, and the head of the locking pin a23 is of a circular rod-shaped structure;
referring to fig. 3:
the air inlet rocker arm b7 is provided with a locking pin hole a7-1, and when the head of the locking pin a23 enters the locking pin hole a7-1, the air inlet rocker arm a6 and the air inlet rocker arm b7 are connected into a whole;
the torsion spring a28 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;
referring to fig. 4:
the exhaust rocker arm shaft 12 is provided with an oil duct b12-1 and an oil hole d12-2, and the oil duct b11-1 is communicated with the oil hole d11-2, the oil hole c16-1 and the stepped oil cavity b 16-2;
the exhaust rocker arm a16 is provided with an oil hole c16-1 and a stepped oil cavity b16-2, a locking pin b26 is arranged in the stepped oil cavity b16-2, a spring b27 is sleeved at the head of the locking pin b26, the base of the locking pin b26 is limited by the end face of the stepped oil cavity b16-2, and a plug b25 is used for installing the locking pin b26 and the spring b27 and then sealing the stepped oil cavity b16-2 and is in threaded connection with the wall surface of the stepped oil cavity b 16-2;
the base of the locking pin b26 is of a cylindrical structure, and the head of the locking pin b26 is of a circular rod-shaped structure;
referring to fig. 5:
the exhaust rocker arm b17 is provided with a locking pin hole b17-1, and when the head of the locking pin b26 enters the locking pin hole b17-1, the air inlet rocker arm b16 and the air inlet rocker arm b17 are connected into a whole;
the torsion spring b29 is sleeved on the outer surface of the exhaust rocker arm shaft 12, the fixed end is welded on the exhaust rocker arm shaft 12, and the stress end is in sliding contact with the lower side of the exhaust rocker arm b 17;
referring to fig. 6:
the air inlet cam a8 drives the air inlet rocker arm a6, the air inlet cam b10 drives the air inlet rocker arm b7, the air inlet cam a8 and the air inlet cam b10 are fixedly connected to the surface of the air inlet cam shaft 9, and the two are different by 180 DEG phase angle;
referring to fig. 7:
for a four-cylinder four-stroke engine which is common in the market, taking an example of a firing order of 1-3-4-2, although four cylinders 20 may be in different strokes before the engine is started, there is necessarily one cylinder 20 in an intake stroke and an intake valve 5 thereof is in an open state. When the engine needs to be started, after the electromagnetic valve 2 is opened, high-pressure gas in the high-pressure gas cylinder 1 can flow into the cylinder 20 to expand and do work, so that the engine starts to rotate;
referring to fig. 8:
for a six-cylinder four-stroke engine, as is common in the market, for example, the firing order is 1-5-3-6-2-4, the engine will have one or more cylinders 20 in the intake stroke with the intake valve 5 in the open state. When the engine needs to be started, after the electromagnetic valve 2 is opened, high-pressure gas in the high-pressure gas cylinder 1 can flow into the cylinder 20 to expand and do work, so that the engine starts to rotate.
In combination with each component and the installation position relation thereof, the technical scheme of the variable valve timing mechanism of the engine is as follows:
the specific working process of the device can be divided into the following two cases:
the specific working process of the device can be divided into the following two cases:
when the engine is started to work, the following steps are carried out: the throttle valve 3 is closed, the electromagnetic valve 2 is opened, and high-pressure gas flows into the air inlet pipeline 4 behind the throttle valve 3 from the high-pressure gas cylinder 1; for the four-stroke four-cylinder or six-cylinder automobile engine commonly used in the market at present, the cylinder 20 is necessarily in the air inlet stroke before the engine is started, the air inlet valve 5 is in an open state at the moment, the air inlet pipeline 4 is communicated with the cylinder 20, high-pressure air in the high-pressure air cylinder 1 flows into the cylinder 20 through the air inlet pipeline 4, expansion work is done, the piston 21 is pushed to move downwards, and the engine rotates. Meanwhile, the oil duct a11-1 is filled with high-pressure oil into the oil cavity a6-2 through the oil hole b11-2 and the oil hole a6-1, so that the hydraulic force borne by the locking pin a23 is larger than the acting force of the spring a22, the locking pin a23 moves towards the direction of the air inlet rocker arm b7, when the locking pin a23 is aligned with the locking pin hole a7-1 in the air inlet rocker arm b7, the head of the locking pin a23 can enter the locking pin hole a7-1 in the air inlet rocker arm b7, the air inlet rocker arm a6 and the air inlet rocker arm b7 are connected into a whole under the action of the hydraulic pressure and the locking pin a23, and therefore, the air inlet valve 5 is opened in the air inlet stroke of the cylinder under the direct drive of the air inlet cam a8 and the air inlet rocker arm a6, and is also opened in the air cylinder expansion stroke under the indirect drive of the air inlet cam b10 and the air inlet rocker arm b7, and the air inlet valve is opened in the descending stroke of the piston when the piston is in the starting working state; the oil duct b12-1 is communicated with high-pressure oil into the oil cavity b16-2 through the oil hole d12-2 and the oil hole c16-1, so that hydraulic force borne by the locking pin b26 is larger than acting force of the spring b27, the locking pin b26 moves towards the direction of the exhaust rocker arm b17, when the locking pin b26 is aligned with the locking pin hole b17-1 in the exhaust rocker arm b17, the head of the locking pin b26 can 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 a whole under the action of hydraulic pressure and the locking pin b26, and therefore, the exhaust valve 18 is opened in an exhaust stroke of a cylinder under the direct drive of the exhaust cam a13 and the exhaust rocker arm a16, and is also opened in the compression stroke of the cylinder under the indirect drive of the exhaust cam b15 and the exhaust rocker arm b17, and the exhaust valve is opened in the upward stroke of a piston when the piston is in a starting working state; therefore, the valve opening rule in the starting working condition of the engine is changed from the conventional air inlet-compression-acting-exhaust four-stroke working mode to the air inlet-exhaust two-stroke working mode, the acting density of the cylinder 20 in the pneumatic starting process can be improved, and the response of the pneumatic starting of the engine can be improved. When the high-pressure gas enters the cylinder 20 to expand and do work, the piston 21 is pushed to pass through the upper dead point of the piston, the exhaust valve 18 is opened, and the air after doing work is discharged out of the cylinder through the exhaust pipeline 19; when the piston 21 further passes through the upper dead center of the piston, the air inlet valve 5 is opened again, high-pressure air flows into the air cylinder 20, expansion works, and the piston 21 is pushed to move downwards; the engine can reach the target rotating speed after a plurality of cycles, and the starting is completed.
When the engine enters normal operation after starting: the electromagnetic valve 2 is closed, the high-pressure gas cylinder 1 is not communicated with the air inlet channel 4, and high-pressure gas is not supplied any more; the oil duct a11-1 is used for introducing low-pressure oil into the oil cavity a6-2 through the oil hole b11-2 and the oil hole a6-1, the pressure of the low-pressure oil is smaller than the acting force of the spring a22 at the moment, the locking pin a23 is remained in the air inlet rocker arm a6, the air inlet rocker arm a6 is completely independent of the air inlet rocker arm b7, the air inlet cam b10 drives the air inlet rocker arm b7 to swing empty, the torsion spring a28 resets, the air inlet cam b10 and the air inlet rocker arm b7 are always kept in contact, and the opening of the air inlet valve 5 is only driven by the air inlet cam a8 and the air inlet rocker arm a6 and is only opened when the air cylinder 20 enters an air stroke; the oil duct b12-1 is used for introducing low-pressure oil into the oil cavity b16-2 through the oil hole d12-2 and the oil hole c16-1, the pressure of the low-pressure oil is smaller than the acting force of the spring b27 at the moment, the locking pin b26 is remained in the exhaust rocker arm a16, the exhaust rocker arm a16 and the exhaust rocker arm b17 are completely independent, the exhaust cam b15 drives the exhaust rocker arm b17 to swing empty, the torsion spring b29 resets, the exhaust cam b15 and the exhaust rocker arm b17 are always kept in contact, the exhaust valve 18 is opened only by the driving of the exhaust cam a13 and the exhaust rocker arm a16, the engine is opened only when the exhaust stroke of the cylinder 20 is carried out, and the engine is restored to an air inlet-compression-acting-exhaust four-stroke working mode and normally works.
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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711270418.4A CN107859583B (en) | 2017-12-05 | 2017-12-05 | Pneumatic starting system of automobile engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711270418.4A CN107859583B (en) | 2017-12-05 | 2017-12-05 | Pneumatic starting system of automobile engine |
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| CN107859583A CN107859583A (en) | 2018-03-30 |
| CN107859583B true CN107859583B (en) | 2023-10-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980035071A (en) * | 1996-11-11 | 1998-08-05 | 김영귀 | Opening and closing variable device of intake valve |
| CN1858409A (en) * | 2006-06-02 | 2006-11-08 | 李明 | Engine valve driving device |
| CN2921295Y (en) * | 2005-12-20 | 2007-07-11 | 重庆建设摩托车股份有限公司 | Valve actuating mechanism for motorcycle six-stroke engine |
| CN101078375A (en) * | 2007-07-27 | 2007-11-28 | 奇瑞汽车有限公司 | Gasoline engine valve lift and phase variable system |
| CN105899770A (en) * | 2013-11-25 | 2016-08-24 | Pac制动公司 | Compression-release engine brake system for lost motion rocker arm assembly and method of operation thereof |
| CN207598406U (en) * | 2017-12-05 | 2018-07-10 | 吉林大学 | A kind of pneumatic activation system of automobile engine |
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2017
- 2017-12-05 CN CN201711270418.4A patent/CN107859583B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980035071A (en) * | 1996-11-11 | 1998-08-05 | 김영귀 | Opening and closing variable device of intake valve |
| CN2921295Y (en) * | 2005-12-20 | 2007-07-11 | 重庆建设摩托车股份有限公司 | Valve actuating mechanism for motorcycle six-stroke engine |
| CN1858409A (en) * | 2006-06-02 | 2006-11-08 | 李明 | Engine valve driving device |
| CN101078375A (en) * | 2007-07-27 | 2007-11-28 | 奇瑞汽车有限公司 | Gasoline engine valve lift and phase variable system |
| CN105899770A (en) * | 2013-11-25 | 2016-08-24 | Pac制动公司 | Compression-release engine brake system for lost motion rocker arm assembly and method of operation thereof |
| CN207598406U (en) * | 2017-12-05 | 2018-07-10 | 吉林大学 | A kind of pneumatic activation system of automobile engine |
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| CN107859583A (en) | 2018-03-30 |
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