CN108757085B - Variable valve lift structure and control method thereof - Google Patents
Variable valve lift structure and control method thereof Download PDFInfo
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- CN108757085B CN108757085B CN201810907770.2A CN201810907770A CN108757085B CN 108757085 B CN108757085 B CN 108757085B CN 201810907770 A CN201810907770 A CN 201810907770A CN 108757085 B CN108757085 B CN 108757085B
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- valve lift
- rocker arm
- guide groove
- tappet
- swing rod
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
- F01M9/10—Lubrication of valve gear or auxiliaries
- F01M9/104—Lubrication of valve gear or auxiliaries of tappets
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D2013/0296—Changing the valve lift only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention discloses a variable valve lift structure which comprises a valve, a rocker arm and a tappet, wherein one end of the rocker arm is connected with the valve, the other end of the rocker arm is connected with the tappet, the rocker arm is of an arc-shaped structure similar to an arch bridge type, the variable valve lift structure further comprises a valve lift adjusting mechanism, a guide groove is arranged on the rocker arm, the guide groove is of an arc-shaped strip-shaped groove, one end of the valve lift adjusting mechanism is connected to the rocker arm in a sliding mode through the guide groove, and the other end of the valve lift adjusting mechanism is connected to a cylinder cover. The valve lift adjusting mechanism slides in the guide groove, so that the position of the valve lift adjusting mechanism on the rocker arm can be changed, the position of a supporting point of the rocker arm is changed, and the valve lift is changed. Different opening heights of the valve are realized by changing supporting points of the rocker arm, so that different valve lift demands of the engine under different working conditions can be met, and the fuel economy and the maneuvering performance of the engine can be effectively improved. The invention also discloses a control method of the variable valve lift structure.
Description
Technical Field
The invention belongs to the technical field of engine valve actuating mechanisms, and particularly relates to a variable valve lift structure and a control method thereof.
Background
With the increasingly prominent problems of global energy crisis, environmental pollution and the like, the fuel oil quantity of the automobile is saved, the utilization rate of gasoline is improved, and the method becomes the key point of development of automobile companies at home and abroad.
When the engine runs under the working conditions of low speed and low load, the small stroke can increase the vortex in the cylinder, the atomization effect of strong air and fuel oil is improved, the combustion is improved, and the torque of the engine at low speed is improved; when the engine runs at high speed and high load, the large valve lift can reduce the resistance at the valve, increase the air inflow and improve the efficiency of the engine, however, the valve lift of the traditional engine valve actuating mechanism is fixed, is a compromise result under different working conditions, and cannot give consideration to the performance of the engine at high speed and low speed, so that the fuel economy and the maneuvering performance are poor.
Although a large number of variable valve driving mechanisms exist in the current market, most of variable valve lift devices adopted in the prior art have complex structures, poor lubrication conditions, high manufacturing cost and large assembly errors; and the variable mechanism is arranged above the valve rocker or the tappet, which is unfavorable for the miniaturization requirement of the engine and the arrangement of the engine in the whole vehicle.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide the variable valve lift structure which is simple in structure and convenient to realize and can realize different opening heights of the valve by changing the supporting point of the rocker arm, the variable valve lift structure can meet different valve lift requirements of an engine under different working conditions, the fuel economy and the maneuvering characteristics of the engine can be effectively improved, and the problems that the valve lift of a traditional engine valve actuating mechanism is fixed and cannot be used for considering the high-speed and low-speed engine performance, so that the fuel economy and the maneuvering characteristics are poor are solved. The invention also provides a control method of the variable valve lift structure.
In order to achieve the above purpose, the technical scheme of the invention is as follows: the utility model provides a variable valve lift structure, includes valve, rocking arm and tappet, and the one end and the valve of rocking arm are connected, and the other end and the tappet of rocking arm are connected, variable valve lift structure still includes valve lift adjustment mechanism, be equipped with the guide way on the rocking arm, valve lift adjustment mechanism's one end passes through guide way sliding connection on the rocking arm, and valve lift adjustment mechanism's the other end is connected on the cylinder cap.
Further, the valve lift adjusting mechanism comprises a swing rod and a driving mechanism for driving the swing rod to move, the driving mechanism is connected with the swing rod, one end of the swing rod is slidably connected to the guide groove through a swing arm shaft, the other end of the swing rod is connected to the cylinder cover through a rotating shaft, and the swing rod freely rotates around the rotating shaft.
Furthermore, the rocker arm shaft is connected in the guide groove in a sliding way, and snap springs used for limiting axial movement of the rocker arm shaft in the guide groove are arranged at two ends of the rocker arm shaft.
Further, the guide way includes guide way I and guide way II, and guide way I sets up on the side of the fore-and-aft direction of rocking arm, and guide way I runs through the front and back side of rocking arm, and guide way II sets up on the side of the upper and lower direction of rocking arm, and guide way II runs through the upper and lower side of rocking arm, the both ends portion joint of rocking arm axle in guide way I.
Further, the driving mechanism comprises a motor and a crank, one end of the crank is connected with the swing rod, the other end of the crank is connected with an output shaft of the motor, and the motor is fixedly connected to the cylinder cover.
Furthermore, a guide groove III is formed in the swing rod, and a crank is matched and connected to the swing rod in a sliding mode through a sliding pin and the guide groove III.
Furthermore, the sliding pin is in clearance fit with the guide groove III, one end of the sliding pin is connected with the crank, and the other end of the sliding pin penetrates through the guide groove III and is connected to the swing rod through the clamp spring.
Further, the variable valve lift structure further comprises a cam and a hydraulic tappet, one end of the hydraulic tappet is in contact with the cam, the other end of the hydraulic tappet is connected with one end of the tappet, and the other end of the tappet is connected with the rocker arm.
Further, the connection part of the hydraulic tappet and the tappet is provided with an arc-shaped connector, the hydraulic tappet is provided with an arc-shaped groove matched with the connector on the tappet, and a lubricating oil hole is arranged in the arc-shaped groove.
The invention also relates to a control method of the variable valve lift structure, which comprises the following steps:
a) The motor is connected with an ECU of the engine, and receives a rotating speed signal transmitted by the ECU of the engine to control the crank to move, and the crank drives the swing rod to swing;
b) The rocker arm shaft is in clearance fit with the guide groove, the rocker arm shaft is connected to the guide groove in a sliding manner, the rocker arm shaft is connected with the rocker arm, and when the crank is driven by the driving force of the motor to drive the rocker arm to move, the rocker arm and the rocker arm shaft slide along the guide groove on the rocker arm;
c) Small stroke: when the rotation speed of the engine is low, the engine needs a small stroke, the motor receives a rotation speed signal transmitted by the engine ECU, the crank is controlled to rotate, the crank drives the swing rod to swing to one side close to the valve through the sliding pin, and the swing arm shaft moves to the valve along with the swing rod in the guide groove on the swing arm;
d) Large travel: when the rotation speed of the engine is higher, the engine needs a large stroke at the moment, and the air inflow is increased; the motor receives a rotating speed signal transmitted by the engine ECU, controls the crank to rotate, and drives the swing rod to swing to one side close to the tappet rod through the sliding pin, and the rocker shaft moves to the tappet rod side along with the swing rod in the guide groove on the swing rod.
The technical scheme of the invention has the advantages that:
1. the variable valve lift structure realizes different opening heights of the valve by changing the supporting point of the rocker arm, can meet different valve lift demands of an engine under different working conditions, can effectively improve the fuel economy and the maneuvering characteristics of the engine, and solves the problems that the valve lift of the traditional engine valve mechanism is fixed and cannot give consideration to the engine performance at high speed and low speed, so that the fuel economy and the maneuvering characteristics are poor.
2. The variable valve lift structure can give consideration to the engine performance at high and low speeds, adopts small lift at low speeds, improves combustion, improves low-speed torque of the engine and reduces fuel consumption; at high speed, the large lift is adopted, the air inflow is increased, and the engine power is improved. The variable valve lift structure can optimize the performance of the engine according to different working conditions, namely, different valve heights are opened according to different working conditions, so that the fuel economy is improved, and the engine efficiency is improved.
3. The guide groove on the rocker arm provides a continuous and smooth running track for the movement of the rocker arm and the rocker arm shaft, the crank is used for controlling the swing of the rocker arm, and the motor provides a rotating torque for the crank; when the engine needs different valve lifts, the motor drives the crank to rotate, the crank drives the swing rod to swing along the guide groove of the rocker arm, the positions of the swing rod are different, the positions of the rocker arm support points are different, and then continuous variable valve lift is realized.
4. According to the invention, the hydraulic tappet is in spherical contact with the tappet, so that friction force generated when the hydraulic tappet and the tappet relatively rotate can be reduced, and the lubricating oil hole is designed to realize lubricating and cooling effects.
5. The invention has simple structure, convenient realization, low manufacturing cost, high reliability, and can realize the automatic change of the lift of the engine valve along with the change of the engine speed and the load by using fewer parts, and can change the lift characteristic of the valve with great flexibility.
Drawings
The invention is described in further detail below with reference to the attached drawings and detailed description:
fig. 1 is a schematic view showing the overall structure of a variable valve lift structure of the present invention.
Fig. 2 is a schematic diagram of a structure in which a valve lift adjusting mechanism is connected to a rocker arm in the present invention.
The labels in the above figures are respectively: 1. a valve; 2. a rocker arm; 21. a guide groove; 211. a guide groove I; 212. a guide groove II; 22. a rocker shaft; 23. clamping springs; 3. a tappet; 4. a valve lift adjusting mechanism; 41. swing rod; 42. a driving mechanism; 421. a motor; 422. a crank; 43. a rotation shaft; 44. a sliding pin; 5. a cam; 6. a hydraulic tappet.
Detailed Description
In the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "planar direction", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1 and 2, a variable valve lift structure comprises a valve 1, a rocker arm 2 and a tappet 3, wherein one end of the rocker arm 2 is connected with the valve 1, the other end of the rocker arm 2 is connected with the tappet 3, the rocker arm 2 is of a circular arc structure similar to an arch bridge type, the variable valve lift structure further comprises a valve lift adjusting mechanism 4, a guide groove 21 is arranged on the rocker arm 2, the guide groove 21 is a circular arc-shaped long groove, the radian of the guide groove 21 is consistent with that of the rocker arm 2, one end of the valve lift adjusting mechanism 4 is slidably connected onto the rocker arm 2 through the guide groove 21, and the other end of the valve lift adjusting mechanism 4 is connected onto a cylinder cover. The valve lift adjusting mechanism 4 slides in the guide groove 21, so that the position of the valve lift adjusting mechanism 4 on the rocker arm 2 can be changed, the position of a supporting point of the rocker arm 2 is changed, and the valve lift is changed. Different opening heights of the valve are realized by changing supporting points of the rocker arm, so that different valve lift demands of the engine under different working conditions can be met, and the fuel economy and the maneuvering performance of the engine can be effectively improved.
The valve lift adjusting mechanism 4 comprises a swing rod 41 and a driving mechanism 42 for driving the swing rod 41 to move, wherein the driving mechanism 42 is connected with the swing rod 41, one end of the swing rod 41 is slidably connected to the guide groove 21 through a swing arm shaft 22, the swing arm shaft 22 is slidably connected to the guide groove 21, two ends of the swing arm shaft 22 are provided with snap springs 23 for limiting the swing arm shaft 22 to axially move in the guide groove 21, and the swing rod 41 can swing along the guide groove 21 on the swing arm 2 along with the swing arm shaft 22; the other end of the swing rod 41 is connected to the cylinder cover through a rotating shaft 43, and the swing rod 41 freely rotates around the rotating shaft 43.
Preferably, the guide groove 21 includes a guide groove i 211 and a guide groove ii 212, the guide groove i 211 is provided on the side surface of the rocker arm 2 in the front-rear direction, the guide groove i 211 penetrates the front-rear side surface of the rocker arm 2, the guide groove ii 212 is provided on the side surface of the rocker arm 2 in the up-down direction, the guide groove ii 212 penetrates the up-down side surface of the rocker arm 2, both end portions of the rocker arm shaft 22 are engaged in the guide groove i 211, and a portion between both end portions of the rocker arm shaft 22 slides along the guide groove ii 212.
The driving mechanism 42 includes a motor 421 and a crank 422, one end of the crank 422 is connected with the swing rod 41, the other end of the crank 422 is connected with an output shaft of the motor 421, and the motor 421 is fixedly connected to the cylinder cover. The swing rod 41 is provided with a guide groove III 411, and the crank 422 is matched and connected on the swing rod 41 in a sliding manner through the sliding pin 44 and the guide groove III 411. The sliding pin 44 is in clearance fit with the guide slot III 411, one end of the sliding pin 44 is connected with the crank 422, the other end of the sliding pin 44 passes through the guide slot III 411 and is connected to the swing rod 41 through the clamp spring 23, and the clamp spring 23 can also limit the axial movement of the sliding pin 44 in the guide slot III 411. The driving mechanism 42 is a servo motor, the servo motor is connected with an ECU (electronic control unit) of the engine, the motor 421 receives a rotating speed signal transmitted by the ECU of the engine, the crank 422 is controlled to move, when the crank 422 is driven by the driving force of the motor 421 to drive the swing rod 41 to move, the swing rod 41 and the swing arm shaft 22 slide along the guide groove 21 on the swing arm 2 together, and the positions of the swing rod 41 and the swing arm shaft 22 on the swing arm 2 are changed, so that the positions of supporting points of the swing arm 2 are changed, and different opening heights of the air valves are realized; the guide groove 21 provides a continuous and smooth track for the movement of the swing rod 41 and the swing arm shaft 22, so that the continuous change of the valve lift can be realized, and the automatic continuous change of the valve lift along with the change of the engine speed and the load in the valve actuating mechanism of the engine can be realized.
The variable valve lift structure further comprises a cam 5 and a hydraulic tappet 6, wherein one end of the hydraulic tappet 6 is in contact with the cam 5, the other end of the hydraulic tappet 6 is connected with one end of the tappet 3, and the other end of the tappet 3 is connected with the rocker arm 2. The cam 5 is in line contact with the hydraulic tappet 6, the hydraulic tappet 6 is in spherical contact with the tappet 3, and the tappet 3 is in spherical contact with the rocker arm 2. The hydraulic tappet 6 and the tappet 3 are connected, the tappet 3 is provided with a circular arc connector, the hydraulic tappet 6 is provided with a circular arc groove matched with the connector on the tappet 3, and a lubricating oil hole is arranged in the circular arc groove. Preferably, the circular arc connector and the circular arc groove are in a spherical structure, and the hydraulic tappet 6 and the tappet 3 are in spherical contact; friction force generated when the hydraulic tappet 6 and the tappet 3 relatively rotate can be reduced, and the lubricating oil hole is designed to realize lubricating and cooling effects.
The invention designs the rocker arm with the variable supporting point, and the continuous variable of the valve lift is realized by changing the position of the rocker arm shaft, namely, the positions of the rocker arms are different, so that the continuous variable of the valve lift is realized, and the different opening heights of the valve are realized.
The invention also provides a control method of the variable valve lift structure, which comprises the following steps:
a) The motor 421 is connected with the ECU of the engine, the motor 421 receives a rotating speed signal transmitted by the ECU of the engine, controls the crank 422 to move, and the crank 422 drives the swing rod 41 to swing;
b) The rocker arm shaft 22 is in clearance fit with the guide groove 21, the rocker arm shaft 22 is connected to the guide groove 21 in a sliding manner, the rocker arm shaft 22 is connected with the rocker arm 41, and when the crank 422 is driven by the motor 421 to drive the rocker arm 41 to move, the rocker arm 41 and the rocker arm shaft 22 slide along the guide groove 21 on the rocker arm 2;
c) Small stroke: when the engine rotation speed is lower, the engine needs a small stroke, the motor 421 receives a rotation speed signal transmitted by the engine ECU, the crank 422 is controlled to rotate, the crank 422 drives the swing rod 41 to swing towards one side close to the valve 1 through the sliding pin 44, the swing arm shaft 22 moves towards the valve 1 side along with the swing rod 41 in the guide groove 21 on the swing arm 2, and the purpose of reducing the stroke can be achieved; when the engine runs under the working conditions of low speed and low load, the small stroke can increase the vortex in the cylinder, enhance the atomization effect of air and fuel, improve the combustion, improve the torque of the engine at low speed and reduce the fuel consumption.
d) Large travel: when the rotation speed of the engine is higher, the engine needs a large stroke at the moment, and the air inflow is increased; the motor 421 receives a rotation speed signal transmitted by the engine ECU, controls the crank 422 to rotate, and the crank 422 drives the swing rod 41 to swing to the side close to the tappet 3 through the sliding pin 44, and the swing arm shaft 22 moves to the tappet 3 side along with the swing rod 41 in the guide groove 21 on the swing arm 2, so that the purpose of increasing the valve lift can be achieved. When the engine runs under the working conditions of high speed and high load, the resistance at the valve can be reduced by the large valve lift, the air inflow is increased, and the efficiency of the engine is improved.
The variable valve lift structure can give consideration to the engine performance at high and low speeds, adopts small lift at low speeds, improves combustion, improves low-speed torque of the engine and reduces fuel consumption; at high speed, the large lift is adopted, the air inflow is increased, and the engine power is improved. The variable valve lift structure can optimize the performance of the engine according to different working conditions, namely, different valve heights are opened according to different working conditions, so that the fuel economy is improved, and the engine efficiency is improved.
While the invention has been described above with reference to the accompanying drawings, it will be apparent that the invention is not limited to the above embodiments, but is capable of being modified in various ways, or of being applied to other applications without modification, without departing from the scope of the invention.
Claims (7)
1. The utility model provides a variable valve lift structure, includes valve (1), rocking arm (2) and tappet (3), and the one end and the valve (1) of rocking arm (2) are connected, and the other end and the tappet (3) of rocking arm (2) are connected, its characterized in that: the variable valve lift structure further comprises a valve lift adjusting mechanism (4), a guide groove (21) is formed in the rocker arm (2), one end of the valve lift adjusting mechanism (4) is connected to the rocker arm (2) in a sliding mode through the guide groove (21), and the other end of the valve lift adjusting mechanism (4) is connected to the cylinder cover; the guide groove (21) is a circular arc-shaped long groove, and the radian of the guide groove (21) is consistent with that of the rocker arm (2); the valve lift adjusting mechanism (4) comprises a swing rod (41) and a driving mechanism (42) for driving the swing rod (41) to move, the driving mechanism (42) is connected with the swing rod (41), one end of the swing rod (41) is slidably connected to the guide groove (21) through a swing arm shaft (22), the other end of the swing rod (41) is connected to the cylinder cover through a rotating shaft (43), and the swing rod (41) freely rotates around the rotating shaft (43); the rocker shaft (22) is connected in the guide groove (21) in a sliding way; the driving mechanism (42) comprises a motor (421) and a crank (422), one end of the crank (422) is connected with the swing rod (41), the other end of the crank (422) is connected with an output shaft of the motor (421), and the motor (421) is fixedly connected to the cylinder cover; the swing rod (41) is provided with a guide groove III (411), and the crank (422) is matched and connected to the swing rod (41) in a sliding manner through a sliding pin (44) and the guide groove III (411).
2. A variable valve lift structure as defined in claim 1, wherein: and two ends of the rocker arm shaft (22) are provided with snap springs (23) for limiting axial movement of the rocker arm shaft (22) in the guide groove (21).
3. A variable valve lift structure as claimed in claim 1 or 2, characterized in that: guide way (21) are including guide way I (211) and guide way II (212), guide way I (211) set up on the side of the fore-and-aft direction of rocking arm (2), and guide way I (211) run through the front and back side of rocking arm (2), guide way II (212) set up on the side of the upper and lower direction of rocking arm (2), and guide way II (212) run through the upper and lower side of rocking arm (2), the both ends portion joint of rocking arm axle (22) is in guide way I (211).
4. A variable valve lift structure as defined in claim 1, wherein: the sliding pin (44) is in clearance fit with the guide groove III (411), one end of the sliding pin (44) is connected with the crank (422), and the other end of the sliding pin (44) penetrates through the guide groove III (411) and is connected to the swing rod (41) through the clamp spring (23).
5. The variable valve lift structure according to claim 4, characterized in that: the variable valve lift structure further comprises a cam (5) and a hydraulic tappet (6), one end of the hydraulic tappet (6) is in contact with the cam (5), the other end of the hydraulic tappet (6) is connected with one end of the tappet (3), and the other end of the tappet (3) is connected with the rocker arm (2).
6. A variable valve lift structure as defined in claim 5, wherein: the hydraulic tappet (6) is connected with the tappet (3), the tappet (3) is provided with an arc-shaped connector, the hydraulic tappet (6) is provided with an arc-shaped groove matched with the connector on the tappet (3), and a lubricating oil hole is formed in the arc-shaped groove.
7. A control method of a variable valve lift structure according to any one of claims 1 to 6, characterized in that: the control method of the variable valve lift structure comprises the following steps:
a) The motor (421) is connected with an ECU of the engine, the motor (421) receives a rotating speed signal transmitted by the ECU of the engine, controls the crank (422) to move, and the crank (422) drives the swing rod (41) to swing;
b) The rocker arm shaft (22) is in clearance fit with the guide groove (21), the rocker arm shaft (22) is connected to the guide groove (21) in a sliding manner, the rocker arm shaft (22) is connected with the rocker arm (41), and when the crank (422) drives the rocker arm (41) to move under the driving force of the motor (421), the rocker arm (41) and the rocker arm shaft (22) slide along the guide groove (21) on the rocker arm (2);
c) Small stroke: when the engine rotation speed is low, the engine needs a small stroke, the motor (421) receives a rotation speed signal transmitted by the engine ECU, the crank (422) is controlled to rotate, the crank (422) drives the swing rod (41) to swing towards one side close to the valve (1) through the sliding pin (44), and the swing arm shaft (22) moves towards the valve (1) along with the swing rod (41) in the guide groove (21) on the swing arm (2);
d) Large travel: when the rotation speed of the engine is higher, the engine needs a large stroke at the moment, and the air inflow is increased; the motor (421) receives a rotating speed signal transmitted by the engine ECU, the crank (422) is controlled to rotate, the crank (422) drives the swing rod (41) to swing towards one side close to the tappet (3) through the sliding pin (44), and the swing arm shaft (22) moves towards the tappet (3) along with the swing rod (41) in the guide groove (21) on the rocker arm (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810907770.2A CN108757085B (en) | 2018-08-10 | 2018-08-10 | Variable valve lift structure and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810907770.2A CN108757085B (en) | 2018-08-10 | 2018-08-10 | Variable valve lift structure and control method thereof |
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| CN108757085A CN108757085A (en) | 2018-11-06 |
| CN108757085B true CN108757085B (en) | 2023-06-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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