CN217327452U

CN217327452U - High-power engine valve mechanism without camshaft drive and cylinder cover thereof

Info

Publication number: CN217327452U
Application number: CN202220884042.6U
Authority: CN
Inventors: 李伟; 黄永仲; 易加宁; 王利乐; 陈悦; 覃明智
Original assignee: Guangxi Yuchai Marine and Genset Power Co Ltd
Current assignee: Guangxi Yuchai Marine and Genset Power Co Ltd
Priority date: 2022-04-14
Filing date: 2022-04-14
Publication date: 2022-08-30
Anticipated expiration: 2032-04-14

Abstract

The utility model discloses a no camshaft driven high-power engine valve actuating mechanism and cylinder head thereof has solved among the prior art problem that the engine is difficult to realize carrying out free control to (air) intake valve, exhaust valve. The valve mechanism comprises a mounting support arranged on a cylinder cover body, wherein two hydraulic control valves used for driving an exhaust valve rocker arm and an intake valve rocker arm respectively are arranged on the mounting support, each hydraulic control valve comprises a valve body and a valve core, one end of each valve core is connected with a connecting rod, the other end of each valve core is connected with the corresponding valve body in a sliding mode, the other end of each connecting rod is connected with the corresponding exhaust valve rocker arm and the corresponding intake valve rocker arm, and a control assembly for controlling the valve cores to lift is arranged on each valve body. The utility model discloses a no camshaft driven high-power engine valve actuating mechanism and cylinder head thereof cancels the camshaft structure, utilizes hydraulic drive device drive (air) intake valve rocking arm and exhaust valve rocking arm, promotes the dynamic property, the fuel economy, the performance such as emission level of internal-combustion engine.

Description

High-power engine valve mechanism without camshaft drive and cylinder cover thereof

Technical Field

The utility model relates to the technical field of engines, especially, relate to a high-power engine valve actuating mechanism of no camshaft driven and cylinder head thereof.

Background

At present, an internal combustion engine usually drives a camshaft through gears or chains, the camshaft drives an intake rocker arm and an exhaust rocker arm through a series of transmission devices, and the rocker arms drive corresponding intake valves and exhaust valves, so that the intake valves and the exhaust valves in a cylinder cover are regularly opened and closed according to the valve timing and the ignition sequence requirement of the internal combustion engine. Because the gear train speed ratio of the driving camshaft is fixed, and the angles and the positions of the intake cam and the exhaust cam on the camshaft are fixed, the lift curves of the intake valve and the exhaust valve of the internal combustion engine are also fixed, so that the opening time, the opening duration and the opening lift of the intake valve and the exhaust valve cannot be correspondingly adjusted according to the requirement of load change of the internal combustion engine and the requirement of different rotating speeds and rotating speed change rates of the internal combustion engine. The potential of performance indexes such as power, torque, oil consumption and emission of the internal combustion engine is difficult to give full play, the application of the internal combustion engine is relatively fixed and single, and the internal combustion engine with corresponding performance characteristics needs to be developed aiming at the requirements of certain application or use scene, so that the increase of the engine models, the improvement of the cost of the whole industry chain such as technical management, production organization and marketing service are bound to be caused.

With the progress of technology, some internal combustion engines start to directly drive intake and exhaust valves of the internal combustion engine by using electromagnetic valves, and the opening of the intake and exhaust valves is realized by controlling the operation of the electromagnetic valves by an electronic control unit of the internal combustion engine. The control of the opening time, the opening lift and the opening duration of the intake valve and the exhaust valve can be realized. However, the solenoid valve has a high driving voltage or current, a large volume size, and high requirements for installation space of the solenoid valve device and control of an electric control system, and is difficult to be widely used.

In addition, there are also internal combustion engines that employ variable valve timing or variable valve lift technology. The control of the opening time and the opening lift of the intake valve and the exhaust valve can be realized, but a camshaft mechanism is still reserved usually, the number of parts of the whole control mechanism is large, the control precision and the control difficulty are high, the change of the original valve mechanism is large, and the inheritance of a product is poor.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is not enough to the above-mentioned of prior art, a no camshaft driven high-power engine valve mechanism and cylinder head thereof, cancel camshaft structure, utilize hydraulic drive device drive (air) intake valve rocking arm and exhaust valve rocking arm, promote the dynamic property, the fuel economy, the performance such as emission level of internal-combustion engine.

The utility model adopts the technical proposal that: the utility model provides a high-power engine valve actuating mechanism of no camshaft driven, is including installing the erection support on the cylinder head body, the erection support on be equipped with two hydraulic control valves that are used for driving exhaust valve rocking arm, intake valve rocking arm respectively, hydraulic control valve include valve body and case, case one end be connected with the connecting rod, the other end and valve body sliding connection, the other end and the exhaust valve rocking arm of connecting rod, intake valve rocking arm are connected, the valve body on be equipped with the control assembly that control case goes up and down.

As a further improvement, a first oil duct, a first oil chamber, a second oil chamber, a third oil chamber and a fourth oil chamber are arranged in the valve body, the first oil chamber and the second oil chamber are communicated with the first oil duct, the second oil chamber is communicated with the third oil chamber and the fourth oil chamber, the second oil chamber is communicated with the third oil chamber through the fourth oil duct, a valve rod used for blocking the fourth oil duct is arranged on the fourth oil duct between the second oil chamber and the third oil chamber, the valve rod is connected with the valve body in a sliding mode, a reset spring is arranged between the valve body and the valve rod, the control assembly is arranged on the valve body above the valve rod, the first oil duct is communicated with an oil inlet pipe, and the fourth oil chamber is communicated with an oil outlet pipe.

Further, the first oil duct is communicated with the first oil chamber and the second oil chamber through a second oil duct and a third oil duct respectively, and the third oil chamber is communicated with the fourth oil chamber through a fifth oil duct.

Further, the ratio of the sectional area of the third oil duct to the sectional area of the second oil duct is 0.13-0.18, and the ratio of the sectional area of the third oil duct to the sectional area of the fourth oil duct is 0.13-0.18.

Further, the control assembly comprises a solenoid armature and a power supply and signal control wire harness, the solenoid armature is arranged in the fourth oil cavity and located above the valve rod, one end of the power supply and signal control wire harness is connected with the solenoid armature, and the other end of the power supply and signal control wire harness is connected with an Electronic Control Unit (ECU) of the engine.

Furthermore, the valve core comprises an ejector rod, a sliding block and a bottom rod, the upper end and the lower end of the sliding block are respectively connected with the ejector rod and the bottom rod, the bottom rod is detachably connected with one end of the connecting rod, the ejector rod is located in the second oil cavity, and the bottom of the sliding block is located in the first oil cavity.

Furthermore, a cylinder head cover is arranged on the periphery of the hydraulic control valve, and the top end of the hydraulic control valve is installed on the cylinder head cover.

The hydraulic control system is characterized by further comprising a high-pressure oil pump, wherein the hydraulic control valves are all connected with the high-pressure oil pump, and a pressure accumulating pipe is arranged between the high-pressure oil pump and the hydraulic control valves.

A high-power engine cylinder head without camshaft drive comprises the valve actuating mechanism.

Advantageous effects

Compared with the prior art, the utility model, have following advantage:

the utility model relates to a high-power engine valve actuating mechanism without camshaft drive and cylinder cover thereof, when the exhaust valve needs to be opened, the electromagnetic coil armature is controlled by the electronic control unit ECU of the engine to be electrified, the valve rod is absorbed after the electromagnetic coil armature is electrified, thereby the second oil cavity is communicated with the third oil cavity, the oil in the second oil cavity flows out towards the third oil cavity, because the sectional area of the fourth oil channel is larger than the sectional area of the third oil channel, the oil in the second oil cavity starts to be reduced, the force applied to the mandril of the valve core is smaller than the force applied to the slide block of the valve core at the moment, the valve core moves upwards, thereby driving the connecting rod, the connecting rod drives the rocker arm to rotate, because of the lever principle, the rocker arm drives the valve bridge of the exhaust valve, thereby overcoming the force of the spring of the exhaust valve, the exhaust valve is opened, the exhaust valve and the intake valve are opened by adopting the structure, the free continuous adjustment of the intake valve and the opening time under different working conditions can be realized, the engine has the advantages that the opening lift range is freely and continuously adjusted, the opening duration is freely controlled, when the engine needs to be stopped emergently, the inlet valves of all cylinders can be in a closed state, fresh air does not enter the engine, the engine is flamed out along with the fresh air, the safety of the engine is improved, and the engine has the advantages of being convenient to use and wide in application range.

Drawings

Fig. 1 is a schematic view of the structure of the present invention;

FIG. 2 is an enlarged schematic view of a part of the structure of the present invention;

fig. 3 is a schematic perspective view of the present invention;

FIG. 4 is an enlarged schematic view of the cross-sectional structure of the valve body of the present invention;

fig. 5 is an enlarged schematic view of the cross-sectional structure of the middle valve element of the present invention.

Wherein: 1-cylinder head body, 2-cylinder head cover, 3-intake valve rocker arm, 4-exhaust valve rocker arm, 5-hydraulic control valve, 6-mounting support, 7-valve body, 8-valve core, 9-connecting rod, 10-first oil duct, 11-first oil duct, 12-second oil duct, 13-third oil duct, 14-fourth oil duct, 15-valve rod, 16-reset spring, 17-oil inlet pipe, 18-oil outlet pipe, 19-second oil duct, 20-third oil duct, 21-fourth oil duct, 22-fifth oil duct, 23-power supply and signal control wiring harness, 24-electromagnetic coil armature, 25-ball head, 26-ejector rod, 27-slide block, 28-bottom rod, 29-oil drainage groove, 30-exhaust valve spring, 31-exhaust valve bridge, 32-exhaust valve.

Detailed Description

The invention will be further described with reference to specific embodiments shown in the drawings.

Referring to fig. 1-5, the present invention provides a camshaft-free driving high power engine valve actuating mechanism, which comprises an installation support 6 installed on a cylinder head body 1, the installation support 6 is provided with two hydraulic control valves 5 for driving an exhaust valve rocker arm 4 and an intake valve rocker arm 3 respectively, the hydraulic control valve 5 comprises a valve body 7 and a valve core 8, one end of the valve core 8 is connected with a connecting rod 9, the other end is connected with the valve body 7 in a sliding manner, the other end of the connecting rod 9 is connected with the exhaust valve rocker arm 4 and the intake valve rocker arm 3, the valve body 7 is provided with a control component for controlling the valve core 8 to lift, an oil inlet of the valve body 7 is connected with an oil inlet pipe 17, the oil inlet pipe 17 is connected with a high pressure oil pump, a sensor is installed at a compression top dead center position of a first cylinder of an engine, an ignition sequence of each cylinder is determined by combining a signal disc, and a valve actuating phase of the intake valve and the exhaust valve, the signal disc is installed on a gear, the gear and a driving gear on a crankshaft are in a speed ratio of 1 to 2, namely when the crankshaft rotates for 2 circles, the gear where the signal disc is located rotates for 1 circle, the condition that the rotating speed relation between the crankshaft and a camshaft of a traditional internal combustion engine is consistent is guaranteed, therefore, after the camshaft is cancelled, the gas distribution phase and the oil injection time of the internal combustion engine can still be determined through the signal disc and a sensor at the compression top dead center position, then an installation support 6 is installed on a cylinder cover body 1 through bolts, then two hydraulic control valves 5 are installed on the installation support 6, the oil inlet ends of the hydraulic control valves 5 are connected with a high-pressure oil pump, the constant oil pressure generated by the high-pressure oil pump is Po, and the hydraulic oil can be shared with oil in an oil pan of the engine.

Specifically, a first oil duct (0), a first oil chamber 11, a second oil chamber 12, a third oil chamber 13 and a fourth oil chamber 14 are formed in the valve body 7, the first oil chamber 11 and the second oil chamber 12 are communicated with the first oil duct 10, the second oil chamber 12 is communicated with the third oil chamber 13 and the fourth oil chamber 14, the second oil chamber 12 is communicated with the third oil chamber 13 through the fourth oil duct 21, a valve rod 15 used for blocking the fourth oil duct 21 is arranged on the fourth oil duct 21 between the second oil chamber 12 and the third oil chamber 13, the valve rod 15 is connected with the valve body 7 in a sliding mode, a return spring 16 is arranged between the valve body 7 and the valve rod 15, the control assembly is arranged on the valve body 7 above the valve rod 15, the first oil duct 10 is communicated with an oil inlet pipe 17, and the fourth oil chamber 14 is communicated with an oil outlet pipe 18.

Preferably, the first oil passage 10 communicates with the first and

second oil chambers

11 and 12 through the second and

third oil passages

19 and 20, respectively, and the third oil chamber 13 communicates with the fourth oil chamber 14 through the fifth oil passage 22.

Further, the ratio of the cross-sectional area of the third oil passage 20 to the cross-sectional area of the second oil passage 19 is 0.13 to 0.18, and the ratio of the cross-sectional area of the third oil passage 20 to the cross-sectional area of the fourth oil passage 21 is 0.13 to 0.18.

Further, the control assembly includes a solenoid armature 24 and a power and signal control harness 23, the solenoid armature 24 is disposed in the fourth oil chamber 14 and above the valve rod 15, and the power and signal control harness 23 is connected at one end to the solenoid armature 24 and at the other end to the electronic control unit ECU of the engine.

Further, the valve core 8 comprises an ejector rod 26, a sliding block 27 and a bottom rod 28, the upper end and the lower end of the sliding block 27 are respectively connected with the ejector rod 26 and the bottom rod 28, the bottom rod 28 is detachably connected with one end of the connecting rod 9, the ejector rod 26 is located in the second oil chamber 12, the bottom of the sliding block 27 is located in the first oil chamber 11, an oil drainage groove 29 is formed in the lower end of the bottom rod 28, when the valve core 8 is lifted to a certain height, a small amount of hydraulic oil in the first oil chamber 11 flows out through the oil drainage groove 29 to play a cooling role, the leakage amount is set to be 3% -5% of the flow amount entering the first oil chamber 11 through the second channel 19, and the leakage amount does not affect the control of the hydraulic oil action of the valve core 8.

Furthermore, a ball head 25 is arranged at one end of the connecting rod 9, the connecting rod 9 located at one end of the ball head 25 is movably connected with the rocker arm, and the ball head is designed to facilitate the movement of the rocker arm and reduce resistance.

Further, a cylinder head cover 2 is provided around the hydraulic control valve 5, and the top end of the hydraulic control valve 5 is mounted on the cylinder head cover 2 for protecting the cylinder head body 1 and the hydraulic control valve 5.

The hydraulic control system further comprises a high-pressure oil pump, the hydraulic control valves 5 are connected with the high-pressure oil pump, and a pressure accumulating pipe is arranged between the high-pressure oil pump and the hydraulic control valves 5 and improves the pressure stability of the hydraulic oil system.

A high-power engine cylinder cover without camshaft drive comprises the valve actuating mechanism.

When the valve actuating mechanism of the high-power engine without camshaft drive and the cylinder cover thereof are used, and the exhaust valve 32 is required to be kept closed during the operation of the engine, the control is as follows: an electronic control unit ECU of the engine controls an electromagnetic coil armature 24 not to be electrified according to first cylinder position information acquired by a sensor at the compression top dead center position of a first cylinder of the engine, a power supply and signal control wire harness 23 controls a return spring 16 to press a valve rod 15, a sealing end of the valve rod 15 is further used for blocking a fourth oil channel 21, meanwhile, hydraulic oil flows into a second oil channel 19 and a third oil channel 20 through a first oil channel 10, then the second oil channel 19 and the third oil channel 20 flow into a first oil cavity 11 and a second oil cavity 12, the pressure of the first oil cavity 11 and the pressure of the second oil cavity 12 are both Po, the pressure borne by a mandril 26 of a valve core 8 is Po beta, the pressure borne by the bottom of a sliding block 27 of the valve core 8 is Po alpha, beta and alpha are respectively the stress areas of the mandril 26 and the bottom of the sliding block 27, the elastic force of an exhaust valve spring 30 gives a downward axial force to the valve core 8 as F1 through lever action, as can be seen from the force balance principle, the rocker arm is in a balanced state because the valve element 8 does not move, and the exhaust valve 32 remains closed.

When the exhaust valve 32 needs to be opened or kept opened during the operation of the engine, the electronic control unit ECU of the engine controls the electromagnetic coil armature 24 to pass electricity according to the first cylinder position information acquired by the sensor at the compression top dead center position of the first cylinder of the engine, the electromagnetic coil armature 24 overcomes the elastic force of the return spring 16 to suck the valve rod 15, at the moment, the second oil chamber 12 is communicated with the third oil chamber 13, the hydraulic oil flows to the oil outlet pipe 18 through the fourth oil duct 21 and the fifth oil duct 22, the hydraulic oil finally flows into the oil pan through the oil return channel 18, because the second oil chamber 12 is decompressed, the pressure borne by the mandril 26 of the valve core 8 is reduced, and because the ratio of the sectional area of the third oil duct 20 to the sectional area of the second oil duct 19 is 0.13-0.18, the ratio of the sectional area of the third oil duct 20 to the sectional area of the fourth oil duct 21 is 0.13-0.18, therefore, the hydraulic oil in the second oil chamber 12 is quickly drained, the hydraulic oil in the third oil passage 20 is difficult to fill the second oil chamber 12 in a short time, at this time, the pressure applied to the bottom of the slider 27 of the valve element 8 is still Po, the pressure applied to the mandril 26 of the valve element 8 is P1, and since P1 β < Po β, Po α > Po β + F1, the valve element 8 is subjected to a vertical upward axial thrust greater than a vertical downward axial tension, so that the valve element 8 moves upward to drive the rocker shaft to rotate, and the exhaust valve bridge 31 is pressed to compress the exhaust valve spring 30 to drive the exhaust valve 32 to move downward, so that the exhaust valve 32 is opened.

When the exhaust valve 32 needs to be closed again, the electromagnetic coil armature 24 is cut off through the control of the ECU, the return spring 16 pushes the valve rod 15 to be seated, the sealing end of the valve rod 15 closes the fourth channel 21, at the moment, hydraulic oil in the first oil channel 10 enters the second oil cavity 12 through the third channel 20, so that the valve core 8 is subjected to vertical upward axial pushing force which is equal to vertical downward axial pulling force again, and the exhaust valve 32 is closed.

The high-power engine valve actuating mechanism without camshaft drive and the cylinder cover thereof of the embodiment adopt the structure to open the exhaust valve and the intake valve, can realize the free and continuous adjustment of the opening time of the intake valve and the exhaust valve, the free and continuous adjustment of the opening lift and the free control of the opening duration under different working conditions, when the engine needs to be stopped emergently, the inlet valves of all cylinders can be set to be in a closed state, no fresh air enters the engine, the engine is flamed out along with the fresh air, the safety of the engine is improved, meanwhile, the structure cancels a camshaft, a tappet and a push rod structure, a camshaft mounting hole for mounting the camshaft can not be processed on the corresponding engine cylinder body, and then can cancel the camshaft bush, reduce part quantity, reduce the processing cost, have convenient to use, characteristics that application scope is wide.

The above is only the preferred embodiment of the present invention, and it should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which will not affect the utility model and the utility of the patent.

Claims

1. The utility model provides a high-power engine valve actuating mechanism of no camshaft driven, its characterized in that, is including installing erection support (6) on cylinder head body (1), erection support (6) on be equipped with two hydraulic control valve (5) that are used for driving exhaust valve rocking arm (4), (3) intake valve rocking arm respectively, hydraulic control valve (5) include valve body (7) and case (8), case (8) one end be connected with connecting rod (9), the other end and valve body (7) sliding connection, the other end and exhaust valve rocking arm (4), (3) of (9) are connected, valve body (7) on be equipped with the control assembly that control case (8) go up and down.

2. The camshaft-driverless high-power engine valve train according to claim 1, wherein a first oil duct (10), a first oil chamber (11), a second oil chamber (12), a third oil chamber (13) and a fourth oil chamber (14) are formed in the valve body (7), the first oil chamber (11) and the second oil chamber (12) are communicated with the first oil duct (10), the second oil chamber (12) is communicated with the third oil chamber (13) and the fourth oil chamber (14), the second oil chamber (12) is communicated with the third oil chamber (13) through a fourth oil duct (21), a valve rod (15) for blocking the fourth oil duct (21) is arranged on the fourth oil duct (21) between the second oil chamber (12) and the third oil chamber (13), the valve rod (15) is connected with the valve body (7) in a sliding manner, and a return spring (16) is arranged between the valve body (7) and the valve rod (15), the control assembly is arranged on the valve body (7) above the valve rod (15), the first oil channel (10) is communicated with the oil inlet pipe (17), and the fourth oil cavity (14) is communicated with the oil outlet pipe (18).

3. The high-power engine valve train without camshaft drive of claim 2, characterized in that the first oil passage (10) is communicated with the first oil chamber (11) and the second oil chamber (12) through a second oil passage (19) and a third oil passage (20), respectively, and the third oil chamber (13) is communicated with the fourth oil chamber (14) through a fifth oil passage (22).

4. The valve train of the camshaft-free high-power engine according to claim 3, wherein the ratio of the cross-sectional area of the third oil passage (20) to the cross-sectional area of the second oil passage (19) is 0.13-0.18, and the ratio of the cross-sectional area of the third oil passage (20) to the cross-sectional area of the fourth oil passage (21) is 0.13-0.18.

5. The valveless high-power engine valve train driven by no camshaft according to claim 2, characterized in that the control assembly comprises a solenoid armature (24) and a power supply and signal control wire harness (23), the solenoid armature (24) is arranged in the fourth oil chamber (14) and is positioned above the valve rod (15), one end of the power supply and signal control wire harness (23) is connected with the solenoid armature (24), and the other end of the power supply and signal control wire harness is connected with an Electronic Control Unit (ECU) of the engine.

6. The valve train of the camshaft-free high-power engine as claimed in claim 2, wherein the valve core (8) comprises a top rod (26), a sliding block (27) and a bottom rod (28), the top end and the bottom end of the sliding block (27) are respectively connected with the top rod (26) and the bottom rod (28), the bottom rod (28) is detachably connected with one end of the connecting rod (9), the top rod (26) is located in the second oil chamber (12), and the bottom of the sliding block (27) is located in the first oil chamber (11).

7. The high-power engine valve actuating mechanism without camshaft drive of claim 1, characterized in that the periphery of the hydraulic control valve (5) is provided with a cylinder head cover (2), and the top end of the hydraulic control valve (5) is arranged on the cylinder head cover (2).

8. The camshaft-free driving high-power engine valve actuating mechanism according to claim 1, further comprising a high-pressure oil pump, wherein the hydraulic control valves (5) are connected with the high-pressure oil pump, and a pressure accumulating pipe is arranged between the high-pressure oil pump and the hydraulic control valves (5).

9. A high power engine cylinder head without camshaft drive, characterized in that the cylinder head comprises a valve train according to any of claims 1 to 8.