Engine valve timing adjusting device and adjusting method

Abstract

The invention discloses an engine valve timing adjusting device and method, and belongs to the technical field of engines, the adjusting device comprises a cam shaft, an air valve assembly, an eccentric shaft and a driving assembly, the cam shaft is arranged on one side of an air cylinder valve of an engine, and the air valve assembly is at least partially lapped on the cam shaft and is in contact connection with a cam of the cam shaft; the air valve assembly is used for opening or closing an air cylinder air valve along with rotation of the camshaft. The eccentric shaft is arranged on one side of the cam shaft and rotationally connected with the air valve assembly. The eccentric shaft can drive the end, connected with the eccentric shaft, of the air valve assembly to change relative to the cam shaft; the driving assembly comprises a driving motor and a transmission mechanism, the output end of the driving motor is connected with the transmission mechanism, and the output end of the transmission mechanism is connected with the eccentric shaft; the driving assembly is used for driving the eccentric shaft to rotate steplessly. The transmission mechanism of the driving assembly is used for driving the eccentric shaft to rotate in a stepless mode, and stepless adjustment of valve timing of the engine can be achieved.

Description

Technical Field

[0001] The present application belongs to the field of engine technology, and specifically relates to an engine valve timing adjustment device and an adjustment method. Background Art

[0002] As one of the core components of the engine, the valve train opens and closes the intake and exhaust valves according to the working order of each cylinder, allowing fresh air to enter the cylinder and exhaust gas to leave the cylinder. The whole process of exhaust gas discharge and fresh air or combustible mixture is called ventilation process. The ventilation process plays a key role in the effective combustion of fuel, improving power and economy, and improving emissions. The traditional mechanical valve train can usually only guarantee the performance optimization of the engine under a single working condition. After the speed and load change, the performance optimization effect of the corresponding valve timing and lift needs to be improved. Summary of the invention

[0003] Purpose of the invention: An embodiment of the present application provides an engine valve timing adjustment device, aiming to solve the existing problem that the performance optimization effect of the corresponding valve timing and lift after the engine speed and load change needs to be improved; another purpose of the embodiment of the present application is to provide an engine valve timing adjustment method.

[0004] Technical solution: An engine valve timing adjustment device according to an embodiment of the present application comprises:

[0005] A camshaft, which is arranged on one side of the cylinder valve of the engine;

[0006] An air valve assembly, at least partially overlapped on the camshaft and in contact with a cam of the camshaft, the air valve assembly being used to open or close the cylinder valve as the camshaft rotates;

[0007] An eccentric shaft is arranged on one side of the camshaft and is rotatably connected to the air valve assembly; the eccentric shaft can drive one end of the air valve assembly connected to the eccentric shaft to change its relative position with the camshaft;

[0008] The driving assembly comprises a driving motor and a transmission mechanism, wherein the output end of the driving motor is connected to the transmission mechanism, and the output end of the transmission mechanism is connected to the eccentric shaft; the driving assembly is used to drive the eccentric shaft to rotate steplessly.

[0009] In some embodiments, the transmission mechanism comprises:

[0010] A worm connected to the output end of the driving motor;

[0011] A worm wheel is meshed with the worm, and the worm wheel is connected to the eccentric shaft.

[0012] In some embodiments, the drive assembly further comprises:

[0013] A housing having an accommodating cavity, wherein the worm wheel and the worm are arranged in the accommodating cavity, one end of the eccentric shaft is rotatably arranged in the housing and connected to the worm wheel, the worm wheel is spaced apart from the inner side wall of the housing, two ends of the worm are rotatably arranged in the housing, and one end of the worm is connected to the driving motor;

[0014] The cover body is connected to the shell and covers the accommodating cavity.

[0015] In some embodiments, the eccentric shaft comprises:

[0016] A journal, passing through the housing and rotatably connected to the housing;

[0017] A protruding shaft connected to a side of the journal facing the worm gear, the protruding shaft passing through the worm gear and passing through a side of the worm gear away from the journal; the protruding shaft is coaxial with the journal;

[0018] A nut is arranged on a side of the worm gear away from the shaft neck and is rotationally connected to the extended shaft.

[0019] In some embodiments, the drive assembly further comprises:

[0020] A transfer shaft connected to one end of the extension shaft away from the journal, the transfer shaft being coaxial with the extension shaft; the transfer shaft passes through the cover body and is connected to the cover body;

[0021] A pointer, arranged on a side of the cover away from the housing and connected to the transfer shaft;

[0022] Wherein, an angle mark is arranged on a side of the cover away from the shell, and the pointer can rotate within the range of the angle mark as the eccentric shaft rotates.

[0023] In some embodiments, the worm comprises:

[0024] A main body section, disposed in the accommodating cavity and used for meshing with the worm gear;

[0025] A first stopper, connected to one end of the main body section close to the driving motor and arranged around the outer circumference of the main body section, wherein the first stopper is arranged in the accommodating cavity and is in contact with and connected to the housing;

[0026] A first section is arranged on a side of the first stopper close to the drive motor and connected to the main section. The first section is rotatably arranged in the housing and connected to an output end of the drive motor.

[0027] The second section is arranged on a side of the main section away from the first section and connected to the main section. The second section is rotatably arranged in the shell.

[0028] In some embodiments,

[0029] The worm further includes a second stopper, which is disposed at one end of the main body section away from the first section and is disposed around the outer circumference of the main body section, and is disposed in the accommodating cavity;

[0030] The driving assembly also includes a blind cover and a protective cover. The blind cover is sleeved on the outside of the second section and embedded in the shell. The second limiting member is in contact with and connected to the blind cover. The protective cover is arranged on a side of the blind cover away from the shell and is sealingly connected to the blind cover to cover the opening of the blind cover.

[0031] In some embodiments, a manual reset member is disposed at one end of the second section away from the main section, the manual reset member is connected to the second section and is inserted into the blind cover, and the protective cover is disposed outside the manual reset member.

[0032] In some embodiments, the eccentric shaft further comprises:

[0033] A plurality of connecting shafts are arranged at intervals along the axial direction of the eccentric shaft;

[0034] A plurality of eccentric structures are alternately arranged along the axial direction of the eccentric shaft, the eccentric structure is connected to the connecting shaft, the journal is coaxial with the connecting shaft, and the connecting shaft is not coaxial with the eccentric structure.

[0035] In some embodiments, the gas valve assembly comprises:

[0036] A gas valve component, used to open or close the gas cylinder valve;

[0037] A rocker arm assembly connected to one end of the valve member away from the cylinder valve;

[0038] A push rod assembly is hinged to one end of the rocker arm assembly away from the air valve component;

[0039] A rocker assembly has one end hinged to an end of the push rod assembly away from the rocker arm assembly, and the other end is rotationally connected to the first shaft; an end of the rocker assembly close to the push rod assembly is in contact with the cam.

[0040] In some embodiments, the worm gear and the extension shaft are connected via a flat key.

[0041] Accordingly, an engine valve timing adjustment method according to an embodiment of the present application is applied to an engine valve timing adjustment device according to any one of the aforementioned embodiments, comprising:

[0042] Determine that the eccentric shaft rotates to a first angle when the engine is stopped or in a low-load state, and the eccentric shaft rotates to a second angle when the engine is in a high-load state;

[0043] Acquiring the operating status of the engine;

[0044] Based on the running state of the engine, the driving component drives the eccentric shaft to rotate steplessly to steplessly adjust the rotation angle of the eccentric shaft to a third angle; wherein the first angle ≤ the third angle ≤ the second angle.

[0045] Beneficial effect: Compared with the prior art, an engine valve timing adjustment device according to an embodiment of the present application includes a camshaft, a valve assembly, an eccentric shaft and a drive assembly. The camshaft is arranged on one side of the cylinder valve of the engine, the valve assembly is at least partially overlapped on the camshaft and is in contact with the cam of the camshaft, and the valve assembly is used to open or close the cylinder valve as the camshaft rotates; the eccentric shaft is arranged on one side of the camshaft and is rotatably connected to the valve assembly; the eccentric shaft can drive one end of the valve assembly connected to the eccentric shaft to change its relative position with the camshaft; the drive assembly includes a drive motor and a transmission mechanism, the output end of the drive motor is connected to the transmission mechanism, and the output end of the transmission mechanism is connected to the eccentric shaft; the drive assembly is used to drive the eccentric shaft to rotate infinitely. The present application sets an eccentric shaft to be connected with the valve assembly, and utilizes the transmission mechanism of the driving assembly to drive the eccentric shaft to rotate infinitely, thereby changing the position of the valve assembly on the cam, and realizing the eccentric shaft to infinitely adjust the opening and closing angles of the valve assembly within the allowable angle range, thereby realizing infinite adjustment of the engine valve timing, and realizing the simultaneous advancement or delay of the opening and closing angles of the valve assembly, thereby achieving performance optimization under all working conditions, improving power output and fuel economy, and improving emissions.

[0046] Compared with the prior art, an engine valve timing adjustment method according to an embodiment of the present application is applied to the engine valve timing adjustment device in the aforementioned embodiment, including: determining that the eccentric shaft rotates to a first angle when the engine is stopped or in a low-load state, and the eccentric shaft rotates to a second angle when the engine is in a high-load state; obtaining the operating state of the engine, and based on the operating state of the engine, the driving component drives the eccentric shaft to rotate steplessly, so as to steplessly adjust the rotation angle of the eccentric shaft to a third angle; wherein the first angle ≤ the third angle ≤ the second angle. The engine valve timing adjustment method according to an embodiment of the present application can flexibly adjust the rotation angle of the eccentric shaft according to different working conditions of the engine, and can realize the simultaneous advance or delay of the opening and closing angles of the valve assembly by controlling the eccentric shaft to rotate steplessly through the driving component, so that the adjustment of the opening and closing angles of the valve assembly can be realized at any position within the design range, thereby realizing the stepless adjustment of the engine valve timing, achieving performance optimization under all working conditions, effectively improving the power output and fuel economy of the engine, and improving emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0048] Figure 1 It is a structural schematic diagram of an engine valve timing adjustment device according to an embodiment of the present application;

[0049] Figure 2 is a cross-sectional view of a driving assembly according to an embodiment of the present application along the extension direction of the extension shaft;

[0050] Figure 3 is a cross-sectional view of a driving assembly according to an embodiment of the present application along a direction perpendicular to the extension axis;

[0051] Figure 4 It is a schematic diagram of the structure of the cover plate and the pointer side of the embodiment of the present application;

[0052] Figure 5 It is a flow chart of an engine valve timing adjustment method according to an embodiment of the present application.

[0053] Figure numerals: 1. camshaft; 11. cam; 2. valve assembly; 21. valve component; 22. rocker arm assembly; 23. push rod assembly; 24. rocker arm assembly; 3. eccentric shaft; 31. journal; 32. extension shaft; 33. nut; 34. connecting shaft; 35. eccentric structure; 4. drive assembly; 41. drive motor; 42. transmission mechanism; 421. worm; 4211. main body section; 4212. first limit member; 4213. first section; 4214. second section; 4215. second limit member; 4216. manual reset member; 422. worm wheel; 43. housing; 431. accommodating chamber; 44. cover body; 45. adapter shaft; 46. pointer; 47. blind cover; 48. protective cover; 49. angle mark. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0055] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined. In the description of this application, "vertical" means completely vertical at 90° or almost completely vertical, for example, an angle within the range of 80° to 100° is considered vertical. Similarly, "parallel" means completely parallel or almost completely parallel, for example, an angle within 10° of completely parallel is considered parallel.

[0056] As one of the core components of the engine, the valve mechanism opens and closes the intake and exhaust valves according to the working order of each cylinder, so that fresh air enters the cylinder and exhaust gas is discharged from the cylinder. The whole process of exhaust gas discharge and fresh air or combustible mixture is called ventilation process. The ventilation process plays a key role in the effective combustion of fuel, improving power, economy and improving emissions. The traditional mechanical valve mechanism can usually only ensure the performance optimization of the engine under a single working condition. After the speed and load change, there will be new requirements for valve timing and lift.

[0057] In view of this, an embodiment of the present application provides an engine valve timing adjustment device and an adjustment method, which can fully tap the performance potential of the engine by flexibly changing the valve timing and achieve performance optimization under all working conditions.

[0058] Please refer to Figure 1 and Figure 3 The embodiment of the present application provides an engine valve timing adjustment device, including a camshaft 1, a valve assembly 2, an eccentric shaft 3 and a drive assembly 4, wherein the camshaft 1 is arranged on one side of the cylinder valve of the engine, the valve assembly 2 is at least partially overlapped on the camshaft 1, and is in contact with and connected to the cam 11 of the camshaft 1, and the valve assembly 2 is used to open or close the cylinder valve as the camshaft 1 rotates; the eccentric shaft 3 is arranged on one side of the camshaft 1, and is rotatably connected to the valve assembly 2; the eccentric shaft 3 can drive one end of the valve assembly 2 connected to the eccentric shaft 3 to change its relative position with the camshaft 1; the drive assembly 4 includes a drive motor 41 and a transmission mechanism 42, the output end of the drive motor 41 is connected to the transmission mechanism 42, and the output end of the transmission mechanism 42 is connected to the eccentric shaft 3; the drive assembly 4 is used to drive the eccentric shaft 3 to rotate infinitely.

[0059] In the embodiment of the present application, an eccentric shaft 3 is connected to the valve assembly 2, and the transmission mechanism 42 of the driving assembly 4 is used to drive the eccentric shaft 3 to rotate infinitely. The rotation of the eccentric shaft 3 drives the relative position of the end of the valve assembly 2 connected to the eccentric shaft 3 and the camshaft 1 to change, thereby changing the position of the valve assembly 2 on the cam 11, and realizing the eccentric shaft 3 to infinitely adjust the opening and closing angles of the valve assembly 2 within the allowable angle range, thereby realizing infinite adjustment of the engine valve timing, and realizing the simultaneous advancement or delay of the opening and closing angles of the valve assembly 2, thereby achieving performance optimization under all working conditions, improving power output and fuel economy, and improving emissions.

[0060] Specifically, the embodiment of the present application drives the eccentric shaft 3 to rotate infinitely by providing an eccentric shaft 3 and a driving assembly 4 composed of a driving motor 41 and a transmission mechanism 42. This enables the relative position of the valve assembly 2 and the camshaft 1 to be adjusted continuously and flexibly according to the actual engine speed, load and other working conditions. For example, when the engine is in a low-speed and high-load working condition, the position of the valve assembly 2 can be changed by driving the eccentric shaft 3 to rotate, and the valve opening and closing time can be appropriately advanced or delayed to optimize the valve timing to meet the requirements of the intake volume, exhaust smoothness, etc. under this working condition; similarly, corresponding adaptive adjustments can be made under different working conditions such as high speed and low load, thereby getting rid of the limitation that the traditional mechanism can only be optimized for a single working condition, and improving the overall performance of the engine under multiple working conditions.

[0061] It is understandable that since the valve timing can be adjusted dynamically and accurately according to the actual working conditions, it can ensure that the appropriate amount of intake air enters the cylinder and the exhaust gas is discharged smoothly under various working conditions. For example, under acceleration conditions, by adjusting the valve timing to make the opening and closing angles of the intake valve more reasonable, more fresh air or combustible mixture can enter the cylinder, making the combustion more complete, thereby effectively improving the engine's power output, increasing torque and power. Compared with the traditional valve mechanism optimized for a single working condition, the dynamic performance can be improved in a wider range of working conditions.

[0062] It is also understandable that precise valve timing adjustment helps the fuel burn fully and avoids fuel waste caused by insufficient intake or poor exhaust. Under different working conditions, it can ensure that the fuel and air are mixed in the best proportion and participate in combustion, so that the fuel economy of the engine is improved. For example, under stable working conditions such as constant speed driving, the device can reasonably adjust the valve opening and closing time to make the mixed gas more efficient and reduce the fuel consumption per unit mileage.

[0063] Furthermore, when the valve timing can be optimized in real time according to the working conditions, the intake and exhaust processes are smoother and the combustion is more complete. This can significantly reduce the content of harmful pollutants such as carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx) in the exhaust gas after combustion, thus improving the emission performance of the engine.

[0064] It should be noted that the embodiment of the present application realizes the stepless rotation of the eccentric shaft 3 by setting the driving motor 41 and the transmission mechanism 42, which can realize more precise and continuous adjustment of the position of the valve assembly 2 and the valve timing compared with the step-by-step adjustment method. It can adapt to the specific working conditions of the engine with any small angle or position change within a certain range, avoiding the problem of inaccurate adjustment caused by the gear gap in the step-by-step adjustment, thereby more accurately controlling the opening and closing time and duration of the valve.

[0065] It should also be noted that when the engine operating conditions change, such as transitioning from idle to acceleration, the stepless rotation of the eccentric shaft 3 can make the adjustment process of the valve timing smooth, and there will be no instantaneous performance fluctuations caused by gear switching like in stepped regulation, which ensures the stability and comfort of the engine operation and is also beneficial to extending the service life of various engine components.

[0066] Please refer to Figure 2 and Figure 3 In some embodiments, the transmission mechanism 42 includes a worm 421 and a worm wheel 422 , the worm 421 is connected to the output end of the drive motor 41 , the worm wheel 422 is meshed with the worm 421 , and the worm wheel 422 is connected to the eccentric shaft 3 .

[0067] In the embodiment of the present application, a combination of a worm 421 and a worm wheel 422 is used to achieve an accurate transmission ratio. Since the worm wheel 421 transmission has a high transmission accuracy, the rotational motion of the drive motor 41 can be accurately transmitted to the eccentric shaft 3. For example, the high-speed, low-torque rotational motion output by the drive motor 41 can be converted into the low-speed, high-torque rotation required by the eccentric shaft 3 through the worm wheel 421 transmission, thereby accurately controlling the stepless rotation of the eccentric shaft 3, which is beneficial to improving the performance of the engine. At the same time, the worm wheel 421 transmission can ensure that under various engine operating conditions, the power of the drive motor 41 is stably transmitted to the eccentric shaft 3 according to the set transmission ratio, ensuring the reliability of the valve timing adjustment device. In addition, the transmission mechanism 42 matched with the worm wheel 422 and the worm 421 has a compact overall structure, which can reduce the space occupied.

[0068] Furthermore, the driving motor 41 may be a stepping motor.

[0069] Please refer to Figure 2 and Figure 3 In some embodiments, the driving assembly 4 also includes a shell 43 and a cover body 44, the shell 43 has a accommodating cavity 431, the worm wheel 422 and the worm 421 are arranged in the accommodating cavity 431, one end of the eccentric shaft 3 is rotatably arranged in the shell 43 and connected to the worm wheel 422, the worm wheel 422 is spaced apart from the inner side wall of the shell 43, both ends of the worm 421 are rotatably arranged in the shell 43, and one end of the worm 421 is connected to the driving motor 41; the cover body 44 is connected to the shell 43 and covers the accommodating cavity 431.

[0070] In the embodiment of the present application, a relatively compact structural unit is formed by setting the housing 43 with a housing cavity 431 to accommodate the worm wheel 422 and the worm 421, and installing one end of the eccentric shaft 3 in the housing 43. This design helps to reasonably arrange the valve timing adjustment device in the limited space of the engine. For example, in the engine compartment, the space of each component is very valuable. This compact design can avoid interference with other components and facilitate overall installation and maintenance. At the same time, the housing 43 and the cover body 44 are arranged to cooperate, which can play a better protective effect. On the one hand, they can prevent external dust, impurities, etc. from entering the transmission mechanism 42, and avoid the worm 421 from being aggravated by the wear or jamming due to the entry of impurities. On the other hand, it can also prevent lubricating oil from leaking, ensure the lubricating environment inside the transmission mechanism 42, and extend the service life of the components. At the same time, the worm wheel 422 and the inner side wall of the housing 43 are arranged at intervals, which provides enough space for the rotation of the worm wheel 422 to avoid friction damage caused by contact during operation. This integrated structural design helps to reduce the interference of external factors on the transmission mechanism 42 and the eccentric shaft 3, so that the valve timing adjustment system can work stably under complex and changeable engine operating conditions.

[0071] like Figure 2 As shown, in some embodiments, the eccentric shaft 3 includes a journal 31, an extension shaft 32 and a nut 33. The journal 31 is passed through the housing 43 and is rotatably connected to the housing 43; the extension shaft 32 is connected to the side of the journal 31 facing the worm gear 422, the extension shaft 32 is passed through the worm gear 422, and extends out on the side of the worm gear 422 away from the journal 31; the extension shaft 32 is coaxial with the journal 31; the nut 33 is arranged on the side of the worm gear 422 away from the journal 31, and is screwed to the extension shaft 32.

[0072] In the embodiment of the present application, the eccentric shaft 3 is passed through the housing 43 through the journal 31 and is rotatably connected. This method ensures the firmness of the installation of the eccentric shaft 3 in the housing 43. The close fit between the journal 31 and the housing 43 can withstand various vibrations and torques generated by the engine during operation, and prevent the eccentric shaft 3 from loosening or displacement. For example, when the engine is running at a high speed, a large vibration force will be generated. The stable connection between the journal 31 and the housing 43 can ensure that the position of the eccentric shaft 3 remains unchanged, thereby maintaining the normal operation of the valve timing adjustment device. The journal 31 is connected to the extension shaft 32, and the extension shaft 32 is used to pass through the worm gear 422, and the nut 33 is tightened on the side of the worm gear 422 away from the journal 31, which ensures the stability of the connection and fixation between the worm gear 422 and the eccentric shaft 3.

[0073] It should be noted that in the embodiment of the present application, the cooperation between the journal 31, the extending shaft 32, the nut 33, the housing 43 and the worm gear 422 facilitates assembly on the one hand and facilitates subsequent maintenance on the other.

[0074] Please refer to Figure 2 and Figure 4 In some embodiments, the driving assembly 4 also includes an adapter shaft 45 and a pointer 46, the adapter shaft 45 is connected to the end of the extending shaft 32 away from the journal 31, and the adapter shaft 45 is coaxial with the extending shaft 32; the adapter shaft 45 passes through the cover body 44 and is connected to the cover body 44; the pointer 46 is arranged on a side of the cover body 44 away from the shell 43, and is connected to the adapter shaft 45; wherein, an angle mark 49 is provided on the side of the cover body 44 away from the shell 43, and the pointer 46 can rotate within the range of the angle mark 49 as the eccentric shaft 3 rotates.

[0075] In the embodiment of the present application, by setting a fixed connection between the adapter shaft 45 and the pointer 46, and utilizing the adapter shaft 45 to connect with the extension shaft 32, by setting an angle mark 49 on the cover body 44, and allowing the pointer 46 to rotate within the mark range as the eccentric shaft 3 rotates, a more complete system with monitoring and adjustment functions is formed, which can intuitively display the rotation angle of the eccentric shaft 3, making the entire valve timing adjustment device more comprehensive in function and more convenient in operation, which is beneficial to improving the overall performance and maintainability of the engine.

[0076] Among them, during the debugging process of the engine, the technician can directly observe the angle indicated by the pointer 46, quickly and accurately determine the position of the eccentric shaft 3, and thus understand the current state of the valve timing. During the operation of the engine, this visual angle indicator can be used to monitor the dynamics of the eccentric shaft 3 in real time. Maintenance personnel or operators can check the position of the pointer 46 at any time to determine whether the valve timing has changed due to various factors (such as component wear, control system failure, etc.). If the position of the pointer 46 deviates from the normal range, the problem can be discovered in time and corresponding measures can be taken, such as maintenance or readjustment, so as to ensure that the engine's valve timing is always in the best state and improve the reliability and stability of the engine.

[0077] Furthermore, the angle mark 49 provides an accurate angle reference for the rotation of the eccentric shaft 3, making the adjustment of the eccentric shaft 3 more accurate. The technician can control the rotation angle of the eccentric shaft 3 according to the angle mark 49 according to the specific valve timing requirements. When fine-tuning the valve timing under different engine working conditions, each small angle change may affect the intake and exhaust volumes. The pointer 46 and the angle mark 49 can be used to achieve adjustments accurate to a few degrees or even smaller units, thereby optimizing the performance of the engine under various working conditions.

[0078] like Figure 3 As shown, in some embodiments, the worm 421 includes a main body section 4211, a first stopper 4212, a first section 4213 and a second section 4214, the main body section 4211 is arranged in the accommodating cavity 431, and is used to engage with the worm wheel 422; the first stopper 4212 is connected to one end of the main body section 4211 close to the drive motor 41, and is arranged around the outer peripheral side of the main body section 4211, the first stopper 4212 is arranged in the accommodating cavity 431 and is in contact with and connected to the shell 43; the first section 4213 is arranged on a side of the first stopper 4212 close to the drive motor 41, and is connected to the main body section 4211, the first section 4213 is rotatably inserted into the shell 43, and is connected to the output end of the drive motor 41; the second section 4214 is arranged on a side of the main body section 4211 away from the first section 4213, and is connected to the main body section 4211, and the second section 4214 is rotatably inserted into the shell 43.

[0079] In the embodiment of the present application, by setting the main section 4211 to mesh with the worm wheel 422, connecting with the drive motor 41 through the first section 4213, and penetrating the first section 4213 and the second section 4214 in the housing 43, the positioning and fixing of the position of the worm 421 and good support can be ensured, so that the worm 421 can maintain a stable axial position during rotation. When the drive motor 41 outputs power to rotate the worm 421, the first section 4213 and the second section 4214 can evenly share the radial force borne by the worm 421, avoiding deformation or damage of the worm 421 due to excessive local force. In addition, the first stopper 4212 is set, so that the housing 43 is between the drive motor 41 and the first stopper 4212, which can prevent the worm 421 from causing the meshing accuracy with the worm wheel 422 to decrease due to axial movement, thereby ensuring the stability of the transmission and the accuracy of the valve timing adjustment.

[0080] like Figure 3 As shown, in some embodiments, the worm 421 also includes a second limit member 4215, which is arranged at one end of the main section 4211 away from the first section 4213 and is arranged around the outer peripheral side of the main section 4211, and the second limit member 4215 is arranged in the accommodating cavity 431; the driving assembly 4 also includes a blind cover 47 and a protective cover 48, the blind cover 47 is sleeved on the outside of the second section 4214 and embedded in the shell 43, and the second limit member 4215 is in contact with and connected to the blind cover 47; the protective cover 48 is arranged on a side of the blind cover 47 away from the shell 43, and is sealed and connected to the blind cover 47 to cover the opening of the blind cover 47.

[0081] In the embodiment of the present application, the second stopper 4215 is arranged at one end of the main section 4211 away from the first section 4213, and works together with the first stopper 4212 to form a bidirectional axial stopper for the worm 421. The contact connection between the second stopper 4215 and the cover 47 further enhances the stability of the worm 421 in the axial direction. As a supporting component, the cover 47 can withstand and transmit axial forces, so that the worm 421 can maintain balance when subjected to axial forces. This structure more effectively prevents the worm 421 from moving due to axial forces during operation. When the engine is running, due to factors such as vibration and load changes, the worm 421 may be subjected to axial forces from different directions. The bidirectional stopper can ensure that the worm 421 remains stable in the axial position, thereby ensuring that the meshing accuracy of the worm 421 and the worm wheel 422 is not affected by the axial displacement, improving the stability of the entire transmission mechanism 42, and thus ensuring that the valve timing adjustment device can work accurately and stably.

[0082] The provision of the protective cover 48 can effectively prevent the entry of foreign matter, avoid jamming, and prevent the lubricating oil in the accommodating cavity 431 from leaking.

[0083] like Figure 3 As shown, in some embodiments, a manual reset member 4216 is provided at one end of the second section 4214 away from the main section 4211 , the manual reset member 4216 is connected to the second section 4214 , and is passed through the blind cover 47 , and the protective cover 48 is provided on the outside of the manual reset member 4216 .

[0084] In the embodiment of the present application, by providing a manual reset member 4216, in an emergency situation, such as system power failure or motor failure, the protective cover 48 can be opened, and the worm 421 can be manually rotated by manually adjusting the manual reset member 4216 to reset the eccentric shaft 3 to a preset position.

[0085] It should be noted that the manual reset member 4216 may be a hexagonal head, and in this case, a hexagonal wrench may be used for manual adjustment.

[0086] like Figure 1 As shown, in some embodiments, the eccentric shaft 3 also includes multiple connecting shafts 34 and multiple eccentric structures 35. The multiple connecting shafts 34 are arranged at intervals along the axial direction of the eccentric shaft 3. The multiple eccentric structures 35 are alternately arranged with the multiple eccentric structures 35 along the axial direction of the eccentric shaft 3. The eccentric structures 35 are connected to the connecting shaft 34 and are alternately arranged with the multiple eccentric structures 35 along the axial direction of the eccentric shaft 3. The eccentric structures 35 are connected to the connecting shaft 34. The journal 31 is coaxial with the connecting shaft 34, and the connecting shaft 34 is not coaxial with the eccentric structure 35.

[0087] In the embodiment of the present application, by providing multiple connecting shafts 34 and multiple eccentric structures 35 in a colloidal manner and connecting them, multiple valve assemblies 2 can be connected to the eccentric shaft 3 to achieve the adjustment of the opening and closing of multiple valves.

[0088] The journal 31 and the connecting shaft 34 are coaxial, and the connecting shaft 34 is not coaxial with the eccentric structure 35. The center of the eccentric structure 35 can rotate around the central axis of the connecting shaft 34. The eccentric structure 35 is rotatably arranged on one end of the valve assembly 2, which can drive one end of the valve assembly 2 to move. At this time, the contact position between the valve assembly 2 and the cam 11 of the camshaft 1 can be changed, and the valve timing of the valve assembly 2 can be adjusted.

[0089] like Figure 1 As shown, in some embodiments, the air valve assembly 2 includes an air valve component 21, a rocker arm assembly 22, a push rod assembly 23 and a rocker arm assembly 24. The air valve component 21 is used to open or close the cylinder valve. The rocker arm assembly 22 is connected to one end of the air valve component 21 away from the cylinder valve. The push rod assembly 23 is hinged to one end of the rocker arm assembly 22 away from the air valve component 21. One end of the rocker arm assembly 24 is hinged to one end of the push rod assembly 23 away from the rocker arm assembly 22, and the other end is rotatably connected to the first shaft 351; the end of the rocker arm assembly 24 close to the push rod assembly 23 is in contact with the cam 11.

[0090] In the embodiment of the present application, the valve component 21, the rocker arm assembly 22, the push rod assembly 23, the rocker assembly 24 and the first shaft 351 in the valve assembly 2 are hingedly connected, and the first shaft 351 can be moved in a direction close to or away from the cam 11 of the camshaft 1, so that the contact position between the rocker assembly 24 and the cam 11 of the camshaft 1 can be changed. At this time, the opening and closing time of the valve component 21 can be changed, thereby adjusting the valve timing.

[0091] In some embodiments, the worm gear 422 and the extension shaft 32 are connected by a flat key.

[0092] In an embodiment of the present application, a positioning groove can be set on the inner side wall of the fixing hole of the worm wheel 422, and a positioning key can be set on the outer peripheral side of the extending shaft 32. Alternatively, a positioning key can be set on the inner side wall of the fixing hole of the worm wheel 422, and a positioning groove can be set on the outer peripheral side of the extending shaft 32. The circumferential positioning of the worm wheel 422 and the extending shaft 32 can be achieved by cooperating between the positioning key and the positioning groove.

[0093] It should be noted that in the embodiment of the present application, the worm gear 422 and the worm 421 structure may be provided with a self-locking function, that is, during normal operation, the drive motor 41 can be used to drive the worm 421, the worm 421 drives the worm gear 422 to rotate, and the worm gear 422 drives the eccentric shaft 3 to rotate. However, when the system is powered off, the motor stops working, the worm 421 stops rotating, and the worm gear 422 cannot drive the worm 421 to rotate in the reverse direction. At this time, the manual reset member 4216 can be manually adjusted to rotate the worm 421, and the worm gear 422 is further driven to rotate, so as to adjust the eccentric shaft 3 to a suitable position.

[0094] like Figure 5 As shown, accordingly, an engine valve timing adjustment method described in an embodiment of the present application is applied to the engine valve timing adjustment device of any one of the aforementioned embodiments, including: determining that the eccentric shaft 3 rotates to a first angle when the engine is stopped or in a low-load state, and the eccentric shaft 3 rotates to a second angle when the engine is in a high-load state; obtaining the operating state of the engine; based on the operating state of the engine, the driving component 4 drives the eccentric shaft 3 to rotate infinitely to infinitely adjust the rotation angle of the eccentric shaft 3 to a third angle; wherein the first angle ≤ the third angle ≤ the second angle.

[0095] The engine valve timing adjustment method of the embodiment of the present application can flexibly adjust the rotation angle of the eccentric shaft 3 according to different working conditions of the engine, and control the stepless rotation of the eccentric shaft 3 through the driving component 4, so that the opening and closing angles of the valve component 2 can be adjusted at any position within the design range, thereby realizing stepless adjustment of the engine valve timing, and realizing the simultaneous advancement or delay of the opening and closing angles of the valve component 2, thereby achieving performance optimization under all working conditions, effectively improving the power output and fuel economy of the engine, and improving emissions.

[0096] Specifically, in the embodiment of the present application, the eccentric shaft 3 can rotate by an angle θ, and the corresponding valve opening angles are a and b respectively. At this time, the endpoints of the angle mark are a and b respectively; the drive system identifies the engine operation information (load, speed, etc.) and matches it, giving the optimal position of the eccentric shaft 3, and driving the eccentric shaft 3 to rotate at any position within the angle θ, so that the valve opening angle can be adjusted to any position between a and b.

[0097] Of course, in the embodiment of the present application, a control component is also included, which is connected to the drive motor 41 to control the rotation of the drive motor 41. The drive motor 41 has a closed-loop feedback function, monitors the angle of the motor output shaft, and feeds the angle back to the control component. The control component converts it into the position information of the eccentric shaft 3, matches it with the engine load, and realizes the intelligent control of variable valve timing. Among them, the drive motor 41 does not need to run when the engine operating condition is stable, which can save electricity. In addition, the engine system is provided with a Hall sensor for identifying the position of the first shaft 351 on the eccentric shaft 3.

[0098] Take high load H (valve opening angle is a) and low load L (valve opening angle is b) as examples:

[0099] (1) It is defined that when the engine load is between 0% and 50%, the eccentric shaft 3 needs to be in the low load position L; when the engine load is greater than 50%, the eccentric shaft 3 needs to be in the high load position H;

[0100] (2) The position of the Hall sensor farthest from the first axis 351 on the journal 31 of the eccentric shaft 3 is defined as a high load signal, and the position of the Hall sensor closest to the first axis 351 is defined as a low load signal.

[0101] (3) Before the first operation, adjust the eccentric shaft 3 to the low load position;

[0102] (4) After starting the motor vehicle, the eccentric shaft 3 is kept in the L position during idling and low-load operation;

[0103] (5) When the engine load rises to greater than 50%, the system detects the load change and monitors through the Hall sensor that the eccentric shaft 3 is in the low load position. The system issues a command to rotate the motor, and drives the worm wheel 422, worm 421 and eccentric shaft 3 to rotate, and rotates to the high load position (H) and stops. The eccentric shaft 3 stops at the high load position.

[0104] (6) When the load drops to 0-50%, the eccentric shaft 3 rotates to the low load position according to the same control logic.

[0105] (7) In the shutdown state, the eccentric shaft 3 position continues to maintain a low load state.

[0106] In addition, when a malfunction occurs during engine operation, the following specific treatment measures can be taken.

[0107] 1) System power failure: The motor stops working. Due to the self-locking characteristics of the worm wheel 422 and the worm 421, the position of the eccentric shaft 3 remains in the state before the power failure. The position of the eccentric shaft 3 does not match the working load. When running at high load, the explosion pressure may increase.

[0108] The corresponding treatment measures at this time are: open the protective cover 48, use a socket wrench to manually rotate the worm 421, and rotate the eccentric shaft 3 component to the high load position according to the position of the pointer 46 relative to the scale on the cover plate.

[0109] 2) Hall sensor failure: incorrect identification of the position information of the eccentric shaft 3 may result in (1) excessive rotation angle of the motor, uncontrolled rotation of the eccentric shaft 3, and collision of the valve train components with surrounding parts; or (2) mismatch between the position of the eccentric shaft 3 and the operating load, resulting in deterioration of performance parameters.

[0110] The corresponding treatment measures at this time are: (1) The motor has closed-loop feedback, and when it is blocked, the current is too large and it will stop rotating automatically; (2) When the performance parameters deteriorate, the difference between the indication angle of pointer 46 and the recognition angle of the Hall sensor can be checked; when the motor stops rotating or the recognition angle difference is large, use a wrench to rotate the eccentric shaft 3 to the high-load position, and replace the sensor after the engine mission is completed.

[0111] 3) Fault: Tooth surface is severely worn or broken, (1) the motor cannot drive the worm gear 422 to rotate to the required position; (2) self-locking is impossible, and timing fluctuates.

[0112] The corresponding treatment measures at this time are: rotate the eccentric shaft 3 component to the high load position, and then use additional components to limit it.

[0113] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0114] The above is a detailed introduction to an engine valve timing adjustment device and an adjustment method provided in an embodiment of the present application, and a specific example is used to illustrate the principle and implementation method of the present application. The description of the above embodiment is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that: they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. An engine valve timing adjustment device, characterized in that: include: A camshaft (1) is arranged on one side of a cylinder valve of an engine; A valve assembly (2) is at least partially overlapped on the camshaft (1) and is in contact with a cam (11) of the camshaft (1), wherein the valve assembly (2) is used to open or close the cylinder valve as the camshaft (1) rotates; An eccentric shaft (3) is arranged on one side of the camshaft (1) and is rotatably connected to the air valve assembly (2); the eccentric shaft (3) can drive one end of the air valve assembly (2) connected to the eccentric shaft (3) to change its relative position with the camshaft (1); A drive assembly (4) comprises a drive motor (41) and a transmission mechanism (42); the output end of the drive motor (41) is connected to the transmission mechanism (42), and the output end of the transmission mechanism (42) is connected to the eccentric shaft (3); the drive assembly (4) is used to drive the eccentric shaft (3) to rotate steplessly.

2. The engine valve timing adjustment device according to claim 1, characterized in that: The transmission mechanism (42) comprises: A worm (421) connected to an output end of the driving motor (41); A worm wheel (422) meshes with the worm (421), and the worm wheel (422) is connected to the eccentric shaft (3).

3. The engine valve timing adjustment device according to claim 2, characterized in that: The driving assembly (4) further comprises: A housing (43) having a housing cavity (431), wherein the worm wheel (422) and the worm (421) are arranged in the housing cavity (431), one end of the eccentric shaft (3) is rotatably inserted into the housing (43) and connected to the worm wheel (422), the worm wheel (422) is spaced apart from the inner side wall of the housing (43), both ends of the worm (421) are rotatably inserted into the housing (43), and one end of the worm (421) is connected to the driving motor (41); A cover body (44) is connected to the shell (43) and covers the accommodating cavity (431).

4. The engine valve timing adjustment device according to claim 3, characterized in that: The eccentric shaft (3) comprises: A journal (31) is passed through the housing (43) and is rotatably connected to the housing (43); A protruding shaft (32) is connected to a side of the journal (31) facing the worm gear (422); the protruding shaft (32) passes through the worm gear (422) and passes out from a side of the worm gear (422) away from the journal (31); the protruding shaft (32) is coaxial with the journal (31); A nut (33) is arranged on a side of the worm gear (422) away from the shaft neck (31) and is screwed to the extension shaft (32).

5. The engine valve timing adjustment device according to claim 4, characterized in that: The driving assembly (4) further comprises: A transfer shaft (45) is connected to an end of the extension shaft (32) away from the shaft neck (31), and the transfer shaft (45) is coaxial with the extension shaft (32); the transfer shaft (45) passes through the cover body (44) and is connected to the cover body (44); A pointer (46) is arranged on a side of the cover (44) away from the housing (43) and connected to the transfer shaft (45); Wherein, an angle mark (49) is provided on a side of the cover body (44) away from the housing (43), and the pointer (46) can rotate within the range of the angle mark (49) as the eccentric shaft (3) rotates.

6. The engine valve timing adjustment device according to claim 3, characterized in that: The worm (421) comprises: A main body section (4211), disposed in the accommodating cavity (431) and configured to mesh with the worm gear (422); A first stopper (4212), connected to one end of the main body section (4211) close to the drive motor (41), and arranged around the outer circumference of the main body section (4211), the first stopper (4212) being arranged in the accommodating cavity (431) and in contact with and connected to the housing (43); A first section (4213) is arranged on a side of the first stopper (4212) close to the drive motor (41) and connected to the main section (4211); the first section (4213) is rotatably arranged in the housing (43) and connected to an output end of the drive motor (41); The second section (4214) is arranged on a side of the main section (4211) away from the first section (4213) and is connected to the main section (4211). The second section (4214) is rotatably inserted into the shell (43).

7. The engine valve timing adjustment device according to claim 6, characterized in that: The worm (421) further comprises a second stopper (4215), wherein the second stopper (4215) is arranged at one end of the main body section (4211) away from the first section (4213) and is arranged around the outer circumference of the main body section (4211), and the second stopper (4215) is arranged in the accommodating cavity (431); The driving assembly (4) further comprises a blind cover (47) and a protective cover (48); the blind cover (47) is sleeved on the outside of the second section (4214) and embedded in the shell (43); the second limiting member (4215) is in contact and connection with the blind cover (47); the protective cover (48) is arranged on a side of the blind cover (47) away from the shell (43) and is sealed with the blind cover (47) to cover the opening of the blind cover (47).

8. The engine valve timing adjustment device according to claim 7, characterized in that: A manual reset component (4216) is provided at one end of the second section (4214) away from the main section (4211), the manual reset component (4216) is connected to the second section (4214) and is inserted into the blind cover (47), and the protective cover (48) is covered on the outside of the manual reset component (4216).

9. The engine valve timing adjustment device according to claim 4, characterized in that: The eccentric shaft (3) also includes: A plurality of connecting shafts (34) are arranged at intervals along the axial direction of the eccentric shaft (3); A plurality of eccentric structures (35) are alternately arranged along the axial direction of the eccentric shaft (3), the eccentric structure (35) is connected to the connecting shaft (34), the journal (31) is coaxial with the connecting shaft (34), and the connecting shaft (34) is not coaxial with the eccentric structure (35).

10. The engine valve timing adjustment device according to claim 9, characterized in that: The gas valve assembly (2) comprises: A gas valve component (21), used for opening or closing the gas cylinder valve; A rocker arm assembly (22) connected to an end of the valve component (21) away from the cylinder valve; A push rod assembly (23) is hingedly connected to one end of the rocker arm assembly (22) away from the air valve component (21); A rocker assembly (24) has one end hinged to an end of the push rod assembly (23) away from the rocker arm assembly (22), and the other end is rotationally connected to the eccentric structure (35); an end of the rocker assembly (24) close to the push rod assembly (23) is in contact with the cam (11).

11. The engine valve timing adjustment device according to claim 4, characterized in that: The worm wheel (422) and the extension shaft (32) are connected by a flat key.

12. A method for adjusting engine valve timing, characterized in that: The engine valve timing adjustment device as claimed in any one of claims 1 to 11 comprises: Determining that the eccentric shaft (3) rotates to a first angle when the engine is in a stopped or low-load state, and that the eccentric shaft (3) rotates to a second angle when the engine is in a high-load state; Acquiring the operating status of the engine; Based on the running state of the engine, the driving component (4) drives the eccentric shaft (3) to rotate steplessly, so as to steplessly adjust the rotation angle of the eccentric shaft (3) to a third angle; wherein the first angle ≤ the third angle ≤ the second angle.

Images