Device for adjusting valve spring force and internal combustion engine having the same

Abstract

The application discloses a device for adjusting valve spring force and an internal combustion engine with the same. The valve device comprises a valve assembly, a driving assembly for driving the valve assembly, and a valve adjusting assembly. The valve adjusting assembly comprises a driving mechanism and a transmission mechanism. The driving mechanism is in transmission connection with the transmission mechanism, and the transmission mechanism is in transmission connection with an adjusting base near one end of the driving assembly. The driving mechanism drives the transmission mechanism to rotate in a first direction or a second direction opposite to the first direction, so as to drive the adjusting base to move along the axis direction of the valve rod of the valve. When the transmission mechanism does not rotate, the position of the adjusting base in the axis direction of the valve rod is unchanged. The driving mechanism can drive the transmission mechanism to rotate, thereby adjusting the height of the adjusting base and the spring force of the valve spring. The spring force of the valve spring is adapted to the working condition of the internal combustion engine, and the friction power consumption caused by the large valve spring force is reduced.

Description

Technical Field

[0001] This invention relates to the field of internal combustion engine intake valve technology, and particularly to a device for adjusting valve spring force and an internal combustion engine having the same. Background Technology

[0002] The function of the valve train in an internal combustion engine is to open and close the intake and exhaust valves at set times according to the engine's firing order and operating process. Currently, the valves in an internal combustion engine open and close by overcoming the valve spring force under the drive of the camshaft. The magnitude of the valve spring force is set relatively high based on the engine's rated operating conditions and maximum speed; however, the internal combustion engine does not require the maximum spring force under other operating conditions, such as when the engine speed is low or the load is low, requiring the valve spring force to be less than the rated operating force. Therefore, ideally, the valve spring force should be matched to the engine's operating conditions to reduce frictional power loss caused by excessive valve spring force. This necessitates changing the valve spring force according to the engine's operating conditions. However, in existing technologies, the valve spring force is fixed and cannot be adjusted according to the engine's operating conditions. Summary of the Invention

[0003] The purpose of this invention is to solve the problem in the prior art that the spring force of valve springs is fixed and cannot be changed according to the operating conditions of the internal combustion engine.

[0004] To solve the above-mentioned technical problems, the present invention discloses an adjustable valve spring force device, the valve device including a valve assembly, a drive assembly for driving the valve assembly, and a valve adjustment assembly.

[0005] The valve assembly includes at least a valve, a valve spring, and an adjusting base. The valve spring is sleeved on the valve stem along the valve stem axis, with one end fixedly connected to the end of the valve near the drive assembly, and the other end sleeved in the adjusting base. The valve stem passes through the adjusting base axially. The valve adjusting assembly includes a drive mechanism and a transmission mechanism, which are drively connected. The transmission mechanism is also drively connected to the end of the adjusting base near the drive assembly. The drive mechanism drives the transmission mechanism to rotate in a first direction or a second direction opposite to the first direction, thereby moving the adjusting base along the valve stem axis and adjusting the spring force of the valve spring. When the transmission mechanism is not rotating, the position of the adjusting base along the valve stem axis remains unchanged.

[0006] By employing the above technical solution, the height of the adjusting base within the valve assembly can be adjusted by setting up a valve adjustment component, thereby adjusting the valve spring force. Specifically, the automotive electronic control unit (ECU) can control the drive mechanism to operate according to the internal combustion engine's operating conditions. The drive mechanism drives the transmission mechanism to rotate, thereby adjusting the height of the adjusting base, thus adjusting the valve spring force. This adapts the valve spring force to the internal combustion engine's operating conditions, reducing frictional power consumption caused by excessive valve spring force.

[0007] More specifically, the transmission mechanism can move the adjusting base along the valve stem axis, meaning it can raise or lower the adjusting base along this axis. When the adjusting base rises, the spring force of the valve spring that the drive assembly must overcome increases. When the adjusting base falls, the spring force of the valve spring that the drive assembly must overcome decreases. After the transmission mechanism completes the position adjustment, it stops rotating, and the position of the adjusting base along the valve stem axis remains unchanged. At this point, the change in valve spring force remains constant, thus adapting consistently to different operating conditions. The automotive electronic control unit (ECU) can control the height of the adjusting base according to the internal combustion engine's operating conditions, thereby adapting the valve spring force and the frictional power consumption that the camshaft must overcome to the corresponding operating conditions.

[0008] The present invention also discloses an adjustable valve spring force device, wherein the transmission mechanism is configured as a camshaft, the drive mechanism drives the camshaft to rotate about a direction perpendicular to the valve stem axis of the valve, and the adjusting base is provided with a through hole at one end near the drive assembly, allowing the camshaft to pass through, and the outer peripheral surface of the cam of the camshaft abuts against the inner peripheral surface of the through hole.

[0009] Using the above technical solution, the transmission mechanism is set as a camshaft, and the drive mechanism drives the camshaft to rotate in a direction perpendicular to the valve stem axis, that is, the camshaft rotates around its own axis. Furthermore, a through hole is provided at the end of the adjusting base near the drive assembly, allowing the camshaft to pass through. This is equivalent to hanging the adjusting base on the outer circumferential surface of the camshaft. Therefore, when the camshaft rotates to different positions, the height of the outer circumferential surface of the camshaft is different, thereby adjusting the height of the adjusting base. Moreover, when the camshaft rotates, it can also drive the adjusting base to switch between rising and falling states.

[0010] The present invention also discloses an adjustable valve spring force device, wherein the adjusting base has an extension extending toward the camshaft at one end near the drive assembly, a through hole is formed through the extension, and in the extension direction of the camshaft, the inner peripheral surfaces of the through holes at both ends of the extension abut against the corresponding outer peripheral surfaces of the cam.

[0011] By adopting the above technical solution, the adjustment base can be conveniently hung on the outer peripheral surface of the cam by providing an extension on the adjustment base.

[0012] The present invention also discloses an adjustable valve spring force device, wherein the extension is a lug unit fixedly disposed at one end of the adjustment base. The lug unit includes two lugs symmetrically disposed along the axial direction of the adjustment base. Each lug is hung on a corresponding cam. A spring support surface is provided at one end of the adjustment base away from the lug unit, and the other end of the valve spring abuts against the spring support surface.

[0013] When the camshaft rotates in the first direction, the cam drives the adjusting base to move toward the camshaft along the valve stem axis until the adjusting base reaches the closest position to the camshaft.

[0014] When the camshaft rotates in the second direction, the cam drives the adjusting base to move away from the camshaft along the valve stem axis of the valve until the adjusting base reaches the farthest position away from the camshaft.

[0015] By adopting the above technical solution, the extension is set as a lifting lug unit, which has a simple structure and small size. Furthermore, setting the lifting lug unit as two lugs symmetrically arranged along the axis of the adjusting base improves the stability of the adjusting base when it is mounted on the cam and effectively prevents the adjusting base from detaching from the cam.

[0016] Furthermore, when the camshaft rotates in the first direction, the cam drives the adjusting base to move towards the camshaft along the valve stem axis, meaning the cam causes the adjusting base to rise. When the camshaft rotates in the second direction, the cam drives the adjusting base to move away from the camshaft along the valve stem axis, meaning the cam causes the adjusting base to fall. As the camshaft rotates cyclically, it can switch between rising and falling, continuously and smoothly adjusting the height of the adjusting base, thereby continuously adjusting the valve spring force, causing the valve spring force to switch between increasing and decreasing.

[0017] The present invention also discloses a device for adjusting valve spring force, wherein the drive assembly includes a valve camshaft and a rocker arm assembly, wherein...

[0018] The valve camshaft is located on one side of the rocker arm assembly. The rocker arm assembly is connected to the valve camshaft. One end of the rocker arm assembly extends to the lower part of the transmission mechanism and abuts against the top of the valve stem. The valve camshaft can drive the rocker arm assembly to swing and drive the valve assembly to reciprocate along the valve axis, enabling the valve to switch between closed and open states.

[0019] When the valve is closed, the valve spring is in a preloaded state, and the combustion chamber of the internal combustion engine is closed to the air passage.

[0020] When the valve is open, the valve spring is compressed, and the combustion chamber of the internal combustion engine is open to the air intake.

[0021] Furthermore, the rocker arm assembly includes a rocker arm top post and a rocker arm assembly, the rocker arm assembly including a rocker arm and a follower.

[0022] The rocker arm top post can swing to support the end of the rocker arm away from the valve, while the other end of the rocker arm extends to the lower part of the transmission mechanism and abuts against the top of the valve.

[0023] The follower is located in the middle of the rocker arm, below the valve camshaft, and in contact with the valve camshaft. When the valve camshaft rotates, it pushes the follower and causes the rocker arm to swing around the rocker arm top post.

[0024] By employing the above technical solution, the valves and valve springs are controlled through the valve camshaft and rocker arm assembly, thereby ensuring that the valve camshaft and transmission mechanism do not interfere with each other, and guaranteeing the normal operation of the internal combustion engine. The rocker arm push pin acts as the fulcrum of the rocker arm. The valve camshaft pushes the rocker arm, and the cam structure on the valve camshaft enables the reciprocating swing of the rocker arm, thus controlling the continuous switching between the open and closed states of the valve. Furthermore, the follower component on the rocker arm reduces friction between the valve camshaft and the rocker arm, improving the working efficiency of the valve camshaft and rocker arm assembly.

[0025] Embodiments of the present invention also disclose a device for adjusting valve spring force, wherein the valve assembly includes a pair of valve assemblies spaced apart along the length direction of the drive mechanism, and each valve assembly includes a valve camshaft, a rocker arm assembly and at least one valve assembly.

[0026] In this configuration, at least one cam is provided on the outer wall of the valve camshaft along the axial direction of the valve camshaft, with each cam located on one side of a corresponding rocker arm assembly.

[0027] The above technical solution involves setting up a pair of valve assemblies, corresponding to the intake and exhaust valve mechanisms of an internal combustion engine. Each valve assembly includes a valve camshaft, a rocker arm assembly, and at least one valve component. This ensures the valve assemblies can operate normally.

[0028] The present invention also discloses an adjustable valve spring force device. The drive mechanism includes a driver, a drive shaft, and a drive wheel. The drive shaft is connected to the output end of the driver, and the driver can drive the drive shaft to rotate. The drive shaft is configured as a worm shaft, with worm teeth arranged along its length on the outer wall surface. The drive wheel is a worm wheel adapted to the worm teeth. When the driver drives the worm shaft to rotate, the worm shaft drives the worm wheel to rotate.

[0029] The above technical solution involves using a driver to rotate the transmission shaft. The transmission shaft and transmission wheel constitute a reduction mechanism, which can reduce the speed of the driver and increase the torque of the transmission shaft.

[0030] The present invention also discloses a device for adjusting valve spring force. A connecting hole structure is provided at the center of the worm gear. The connecting hole structure includes any one of a square hole, a spline hole, or a semi-circular hole. A shaft diameter structure adapted to the connecting hole is provided at one end of the transmission mechanism near the worm gear. The shaft diameter structure includes any one of a square shaft, a spline shaft, or a semi-circular shaft.

[0031] By adopting the above technical solution, the worm gear is fixedly mounted on the transmission mechanism through the cooperation of the connecting hole structure and the shaft diameter structure. When the worm gear rotates, it can drive the transmission mechanism to rotate.

[0032] The present invention also discloses a device for adjusting valve spring force, wherein the valve adjusting assembly further includes a torsion spring disposed at the end of the transmission mechanism away from the worm gear.

[0033] The transmission mechanism has a slot at the end away from the worm gear. One end of the torsion spring is locked in the slot, and the other end is locked on the cylinder head.

[0034] Using the above technical solution, a torsion spring is installed at the end of the transmission mechanism away from the worm gear. One of the torsion spring's legs engages and is fixedly connected to a slot, while the other leg is fixedly connected to the cylinder head. When the adjusting component rotates, the torsion spring can apply torque to the adjusting component, reducing the torque required by the driver to control the adjusting component.

[0035] The present invention also discloses a device for adjusting valve spring force. The outer wall of the adjusting base is provided with a groove, and a slider adapted to the groove is provided on the cylinder head of the internal combustion engine. The slider and the groove are slidably connected, and the groove and slider are used to restrict the rotation of the adjusting base and the transmission mechanism. When the adjusting base moves along the valve stem axis, the adjusting base can slide along the groove. Furthermore, multiple oil drain holes are provided on the outer wall of the adjusting base near the spring support surface.

[0036] The above technical solution provides a sliding groove on the outer wall of the adjustment base and a slider adapted to the sliding groove on the cylinder head of the internal combustion engine. The slider and the sliding groove are slidably connected, which can prevent the adjustment base from deflecting and disengaging from the cam. Furthermore, the slider and the sliding groove do not affect the raising and lowering of the adjustment base.

[0037] The embodiments of the present invention also disclose a device for adjustable valve spring force, wherein the axial direction of the transmission mechanism is arranged parallel to the axial direction of the valve camshaft, and the axial direction of the transmission mechanism is arranged perpendicular to the axial direction of the transmission shaft.

[0038] Embodiments of the present invention also disclose an internal combustion engine, including a cylinder head, and a device for adjusting valve spring force as described above.

[0039] By adopting the above technical solution, the internal combustion engine equipped with an adjustable valve spring force device can adjust the position of the spring base according to different operating conditions during operation, thereby adjusting the spring force of the valve spring, so that the spring force of the valve spring matches the operating conditions of the internal combustion engine, and adjusts the frictional work of the spring that the valve assembly needs to overcome when opening and closing, thereby improving the working efficiency of the internal combustion engine.

[0040] The present invention also discloses an adjustable valve spring force device, wherein the transmission mechanism is a camshaft, the drive mechanism drives the camshaft to rotate around a direction perpendicular to the valve axis, and the end face of the adjusting base near the drive assembly is movably connected to the outer peripheral surface of the cam of the camshaft, and when the camshaft rotates, the end face can move up and down in a direction perpendicular to the axis of the camshaft.

[0041] When the camshaft rotates in the first direction, the cam drives the adjusting base to move away from the camshaft along the valve stem axis of the valve until the adjusting base reaches the farthest position away from the camshaft.

[0042] When the camshaft rotates in the second direction, the cam pushes the adjusting base to move toward the camshaft along the valve stem axis until the adjusting base reaches the closest position to the camshaft.

[0043] The above technical solution uses a camshaft as the transmission mechanism, with the end face of the adjusting base near the drive assembly movably connected to the outer peripheral surface of the cam on the camshaft. When the protrusion on the cam rotates downward, its height decreases, and the adjusting base moves downward under the force of the spring. When the protrusion on the cam rotates upward, the adjusting base is pushed upward by the protrusion. With this configuration, when the cam rotates, it can also drive the adjusting base to continuously switch between rising and falling states along the valve stem axis, thus achieving continuous adjustment of the valve spring force.

[0044] The present invention also discloses an adjustable valve spring force device, wherein the transmission mechanism is an eccentric shaft, the drive mechanism drives the eccentric shaft to rotate about a direction perpendicular to the valve stem axis, and the end face of the adjusting base near the drive assembly is movably connected to the outer peripheral surface of the eccentric shaft diameter; wherein

[0045] When the eccentric shaft rotates in the first direction, the eccentric shaft diameter drives the adjusting base to move toward the eccentric shaft along the valve stem axis of the valve until the adjusting base reaches the closest position to the eccentric shaft.

[0046] When the eccentric shaft rotates in the second direction, the eccentric shaft diameter pushes the adjusting base to move away from the eccentric shaft along the valve stem axis of the valve until the adjusting base reaches the farthest position away from the eccentric shaft.

[0047] The above technical solution uses an eccentric shaft as the transmission mechanism. The end face of the adjusting base near the drive assembly is movably connected to the outer circumferential surface of the eccentric shaft diameter. This arrangement is similar to the principle of hanging the adjusting base on the cam via a lug unit. The eccentric shaft diameter corresponds to a protrusion on the cam. When the eccentric shaft rotates in the first direction, the eccentric shaft diameter causes the adjusting base to move towards the eccentric shaft along the valve stem axis, causing the adjusting base to rise. When the eccentric shaft rotates in the second direction, the eccentric shaft diameter pushes the adjusting base away from the eccentric shaft along the valve stem axis, causing the adjusting base to descend.

[0048] Furthermore, with this configuration, when the eccentric shaft rotates, it can also drive the adjusting base to continuously switch between rising and falling states along the valve stem axis, thereby achieving continuous adjustment of the valve spring force.

[0049] The beneficial effects of this invention are:

[0050] This invention provides an adjustable valve spring force device and an internal combustion engine. The device includes a valve assembly, a drive assembly for driving the valve assembly, and a valve adjustment assembly. The valve adjustment assembly includes a drive mechanism and a transmission mechanism. By providing the valve adjustment assembly, the height of the adjustment base in the valve assembly can be adjusted, thereby adjusting the valve spring force. The automotive electronic control unit (ECU) can control the drive mechanism to operate according to the operating conditions of the internal combustion engine. The drive mechanism drives the transmission mechanism to rotate, thereby adjusting the height of the adjustment base and adjusting the valve spring force, so that the valve spring force is adapted to the operating conditions of the internal combustion engine, reducing the frictional power loss caused by large valve spring forces.

[0051] Furthermore, once the transmission mechanism controls the adjusting base to complete the position adjustment, the transmission mechanism stops rotating, and the position of the adjusting base along the valve stem axis remains unchanged. At this time, the change in valve spring force remains constant, thus enabling it to adapt consistently to different operating conditions. In addition, the height of the adjusting base can be continuously and smoothly adjusted via the transmission mechanism, thereby continuously adjusting the valve spring force. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the adjustable valve spring force device according to Embodiment 1 of the present invention;

[0053] Figure 2 This is a schematic diagram of the worm gear in the adjustable valve spring force device of Embodiment 1 of the present invention;

[0054] Figure 3 This is a schematic diagram of the camshaft structure in the adjustable valve spring force device of Embodiment 1 of the present invention;

[0055] Figure 4 This is a schematic diagram of the structure of the adjusting base in the adjustable valve spring force device of Embodiment 1 of the present invention;

[0056] Figure 5 This is a partial cross-sectional view of the adjustable valve spring force device of Embodiment 1 of the present invention installed after an internal combustion engine;

[0057] Figure 6 This is a schematic diagram of the operation of the adjustable valve spring force device according to Embodiment 1 of the present invention.

[0058] Explanation of reference numerals in the attached figures:

[0059] 1. Valve camshaft;

[0060] 2. Rocker arm assembly;

[0061] 21. Rocker arm; 22. Follower part; 23. Rocker arm top column;

[0062] 3. Valve stem;

[0063] 4. Valve springs;

[0064] 5. Driver;

[0065] 6. Worm gear;

[0066] 61. Connecting hole structure;

[0067] 7. Camshaft;

[0068] 71. Cam; 72. Shaft diameter structure;

[0069] 8. Adjust the base;

[0070] 81. Slide groove; 82. Lifting lug; 83. Oil drain hole. Detailed Implementation

[0071] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0072] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0073] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0074] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0075] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0076] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0077] Example 1

[0078] Embodiments of the present invention disclose a device for adjusting valve spring force, such as... Figure 1As shown, the valve assembly includes a valve assembly, a drive assembly for driving the valve assembly, and a valve adjustment assembly.

[0079] The valve assembly includes at least a valve stem 3, a valve spring 4, and an adjusting base 8. The valve spring 4 is sleeved on the valve stem 3 along the axial direction, with one end fixedly connected to the end of the valve stem 3 near the drive assembly. The other end of the valve spring 4 is sleeved in the adjusting base 8, and the valve stem 3 can be displaced along the axial direction through the adjusting base 8.

[0080] It should be noted that those skilled in the art will understand that the valve assembly actually includes other parts, such as the upper spring seat and the upper seat locking pin, and that the valve stem 3 and the valve cover (not shown in the figure) are not separate parts, but different parts of the valve. Furthermore, in Figure 5 In this context, it can be understood that the direction of the valve stem axis is the same as the direction of the valve stem length.

[0081] The valve adjustment assembly includes a drive mechanism and a transmission mechanism. The drive mechanism is connected to the transmission mechanism, and the transmission mechanism is connected to the end of the adjustment base 8 near the drive assembly. The drive mechanism drives the transmission mechanism to rotate in a first direction or a second direction opposite to the first direction, so as to move the adjustment base 8 along the axis of the valve stem 3 to adjust the spring force of the valve spring 4. When the transmission mechanism does not rotate, the position of the adjustment base 8 in the axis of the valve stem 3 remains unchanged.

[0082] Specifically, in this embodiment, the valve assembly can be any valve mechanism commonly found in internal combustion engines. This embodiment does not make any specific limitations on this, as long as it has a movable adjustable base 8 and does not affect the operation of the valve adjustment assembly, so as to complete the relative height adjustment of the adjustable base 8, thereby realizing the adjustment of the spring force of the valve spring 4.

[0083] More specifically, in this embodiment, the valve spring 4 and one end of the valve stem 3 can be connected by welding, screwing, snapping, or integral forming. The valve cover and valve stem 3 are preferably integrally formed and fixedly connected. Those skilled in the art can also set according to actual needs and specific circumstances. This embodiment does not make specific limitations in this regard.

[0084] Furthermore, it should be understood that, for those skilled in the art, the drive mechanism may only be configured as follows: Figure 1The drive unit 5, or an electric motor, hydraulic motor, or other driving component, can drive the transmission mechanism to rotate. It can also be configured as a drive unit acceleration / deceleration mechanism or other transmission mechanism, such as an electric motor acceleration / deceleration gear mechanism, an electric motor plus worm gear mechanism, a hydraulic motor plus lead screw mechanism, etc. The transmission mechanism can be a single camshaft 7, an eccentric shaft, or a shaft component plus other transmission mechanisms. Those skilled in the art can design it according to actual needs; this embodiment is not limited to this.

[0085] More specifically, in this embodiment, the first direction and the second direction are opposite. For example, when the first direction is set to clockwise, the second direction is counterclockwise; when the first direction is set to counterclockwise, the second direction is clockwise. This embodiment does not impose any specific limitations on this.

[0086] More specifically, in this embodiment, by providing a valve adjustment assembly, the height of the adjustment base 8 in the valve assembly can be adjusted, thereby adjusting the spring force of the valve spring 4. Specifically, the automotive electronic control unit (ECU) can drive the drive mechanism to operate according to the operating conditions of the internal combustion engine. The drive mechanism drives the transmission mechanism to rotate, thereby adjusting the height of the adjustment base 8 and adjusting the spring force of the valve spring 4, so that the spring force of the valve spring 4 is adapted to the operating conditions of the internal combustion engine, reducing the frictional power consumption caused by the large valve spring force.

[0087] More specifically, the transmission mechanism can drive the adjusting base 8 to move along the axis of the valve stem 3, that is, the transmission mechanism can drive the adjusting base 8 to rise or fall along the axis of the valve stem 3. When the adjusting base 8 rises along the axis of the valve stem 3, the spring force of the valve spring 4 that the drive assembly needs to overcome increases. When the adjusting base 8 falls along the axis of the valve stem 3, the spring force of the valve spring 4 that the drive assembly needs to overcome decreases. And after the transmission mechanism controls the adjusting base 8 to complete the position adjustment, the transmission mechanism no longer rotates, and the position of the adjusting base 8 in the axis of the valve stem 3 remains unchanged. At this time, the spring force of the valve spring 4 remains constant, thus being able to adapt to different operating conditions. The automotive electronic control unit (ECU) can control the height of the adjusting base 8 according to the operating conditions of the internal combustion engine, so that the valve spring force and the frictional power consumption that the camshaft 7 needs to overcome are adapted to the corresponding operating conditions.

[0088] An embodiment of the present invention also discloses a device for adjusting valve spring force, wherein the transmission mechanism is configured as a camshaft 7, the drive mechanism drives the camshaft 7 to rotate about a direction perpendicular to the axis of the valve stem 3, and the adjusting base 8 is provided with a through hole at one end near the drive assembly, allowing the camshaft 7 to pass through, and the outer peripheral surface of the cam 71 of the camshaft 7 abuts against the inner peripheral surface of the through hole.

[0089] Specifically, in this embodiment, a camshaft 7 extending along its entire length can be provided on the outer wall surface of the camshaft 7, or the cam 71 feature can be provided only at the location where the adjustment base 8 needs to be mounted, such as... Figure 1 and Figure 2 As shown, this embodiment does not impose specific limitations on this.

[0090] More specifically, in this embodiment, the transmission mechanism can also be configured as an eccentric shaft.

[0091] It should be further noted that, see [link / reference] Figure 1 The drive mechanism drives the camshaft 7 to rotate about a direction perpendicular to the axis of the valve stem 3, meaning that the driver 5 rotates, driving the worm gear 6 to rotate, and the worm gear 6 drives the camshaft 7 to rotate, and from Figure 1 and Figure 5 As can be seen, the camshaft 7 is perpendicular to the valve stem 3. Therefore, the camshaft 7 rotates in a direction perpendicular to the axis of the valve stem 3, that is, the camshaft 7 rotates in the direction of its own axis.

[0092] Furthermore, in this embodiment, the through hole at the end of the adjusting base 8 near the drive component can be a hole cut out on the adjusting base 8 to fit the cam 71, or a lifting lug 82, a basket, or other structure can be provided on the upper part of the adjusting component to ensure that the adjusting base 8 can be suspended on the outer peripheral surface of the cam 71 on the camshaft 7 and movably connected. This ensures that when the camshaft 7 rotates, the cam 71 drives the adjusting base 8 to be pulled up or lowered, thereby achieving height adjustment.

[0093] More specifically, in this embodiment, the transmission mechanism is set as a camshaft 7, and the drive mechanism drives the camshaft 7 to rotate in a direction perpendicular to the axis of the valve stem 3, that is, the camshaft 7 rotates in the direction of its own axis. Furthermore, a through hole is provided at the end of the adjusting base 8 near the drive assembly, allowing the camshaft 7 to pass through. This is equivalent to hanging the adjusting base 8 on the outer peripheral surface of the camshaft 7. Therefore, when the camshaft 7 rotates to different positions, the height of the outer peripheral surface of the camshaft 7 is different, thereby adjusting the height of the adjusting base 8. Moreover, when the camshaft 7 rotates, it can also drive the adjusting base 8 to switch between an upward and downward state.

[0094] An embodiment of the present invention also discloses a device for adjusting valve spring force. The adjusting base 8 has an extension extending toward the camshaft 7 at one end near the drive assembly. A through hole is formed through the extension. In the extension direction of the camshaft 7, the inner peripheral surfaces of the through holes at both ends of the extension abut against the outer peripheral surfaces of the corresponding cam 71.

[0095] Specifically, in this embodiment, an extension is provided, and a through hole is provided in the extension, which allows the adjusting base 8 to be easily hung on the outer peripheral surface of the cam 71. The adjusting base 8 is then pulled up or down by the cam 71.

[0096] An embodiment of the present invention also discloses a device for adjusting valve spring force. The extension is a lug unit fixedly disposed at one end of the adjusting base 8. The lug unit includes two lugs 82 symmetrically disposed along the axial direction of the adjusting base 8. Each lug 82 is hung on a corresponding cam 71. A spring support surface is provided at one end of the adjusting base 8 away from the lug unit, and the other end of the valve spring 4 abuts against the spring support surface.

[0097] When the camshaft 7 rotates in the first direction, the cam 71 drives the adjusting base 8 to move toward the camshaft 7 along the axial direction of the valve stem 3 until the adjusting base 8 reaches the closest position to the camshaft 7.

[0098] When the camshaft 7 rotates in the second direction, the cam 71 drives the adjusting base 8 to move away from the camshaft 7 along the axial direction of the valve stem 3 until the adjusting base 8 reaches the farthest position away from the camshaft 7.

[0099] Specifically, in this embodiment, such as Figure 1 and Figure 4 As shown, in this embodiment, the adjusting base 8 is specifically fitted onto the camshaft 7 by setting a lifting lug 82 at one end of the adjusting base 8. The extension is set as a lifting lug unit, which has a simple structure and small size. Setting the lifting lug unit as two lifting lugs 82 symmetrically arranged along the axial direction of the adjusting base 8 can improve the stability of the adjusting base 8 when it is hung on the cam 71, and can better prevent the adjusting base 8 and the cam 71 from separating.

[0100] Furthermore, when the camshaft 7 rotates in the first direction, the protruding part on the cam 71 moves upward, and the cam 71 pulls the adjusting base 8 to move towards the camshaft 7 along the axial direction of the valve stem 3. That is, at this time, the cam 71 drives the adjusting base 8 to rise.

[0101] When the camshaft 7 rotates in the second direction, the protruding part on the cam 71 moves downward. Under the action of the elastic force of the valve spring 4 and the gravity of the adjusting base 8, the lug 82 is always in contact with the outer peripheral surface of the cam 71. Therefore, the adjusting base 8 moves away from the camshaft 7 along the axial direction of the valve stem 3. That is, at this time, the cam 71 drives the adjusting base 8 to descend.

[0102] Furthermore, in this embodiment, when the camshaft 7 rotates along the first direction and the second direction, it can drive the adjusting base 8 to switch between rising and falling states.

[0103] Furthermore, when the camshaft 7 rotates continuously and cyclically in the same direction, due to the structural characteristics of the camshaft 7, it can continuously drive the adjusting base 8 to switch between rising and falling, that is, it can continuously and coherently adjust the height of the adjusting base 8. The principle is the same as that of the valve camshaft 1 driving the valve to continuously open and close. In turn, it can continuously adjust the spring force of the valve spring 4 and switch the spring force of the valve spring 4 between increasing and decreasing.

[0104] More specifically, in this embodiment, there is another implementation method:

[0105] The camshaft 7 rotates in the same direction, causing the adjusting base 8 to continuously switch between rising and falling. This coordinates with the valve camshaft 1's operation when driving the valve to open and close. For example, if the spring force required for the valve camshaft 1 to open the valve stem 3 and valve cover is small, the camshaft 7 can lower the adjusting base 8, reducing the spring force of the valve spring 4. Conversely, if the spring force required for the valve camshaft 1 to close the valve stem 3 and valve cover is large, the camshaft 7 can raise the adjusting base 8, increasing the spring force of the valve spring 4. This allows the change in the spring force of the valve spring 4 to be combined with the opening and closing of the valve, achieving flexible and continuous switching of the spring force of the valve spring 4. Those skilled in the art can configure this according to actual needs; this embodiment does not impose specific limitations. It should be noted that due to the structural characteristics of the camshaft 7, the first direction and the second direction can also be the same direction; this embodiment is not limited to setting two different rotation directions.

[0106] Embodiments of the present invention also disclose a device for adjusting valve spring force, wherein the drive assembly includes a valve camshaft 1 and a rocker arm assembly 2. Wherein:

[0107] The valve camshaft 1 is located on one side of the rocker arm assembly 2. The rocker arm assembly 2 is connected to the valve camshaft 1 in a transmission manner. One end of the rocker arm assembly 2 extends to the lower part of the transmission mechanism and abuts against the top of the valve stem 3. The valve camshaft 1 can drive the rocker arm assembly 2 to swing and drive the valve assembly to move back and forth along the axis of the valve stem 3. The valve stem 3 can drive the valve cover to switch between the closed state and the open state.

[0108] When the valve cover is closed, the valve spring 4 is in a preloaded state, and the combustion chamber of the internal combustion engine is closed to the air passage.

[0109] When the valve cover is open, the valve spring 4 is compressed, and the combustion chamber and air passage of the internal combustion engine are open.

[0110] Specifically, in this embodiment, the valve camshaft 1 and rocker arm assembly 2 control the valve stem 3 and valve spring 4, thereby ensuring that the valve camshaft 1 and the transmission mechanism do not interfere with each other, and ensuring that the internal combustion engine can operate normally. Furthermore, the rocker arm 21 can also achieve real-time control of the valve stem 3.

[0111] More specifically, in this embodiment, the rocker arm assembly 2 can be configured as a rocker arm, a swing rod, a connecting rod, or other structures, and this embodiment does not specifically limit it.

[0112] It should be noted that in this embodiment, the valve spring 4 being in a preloaded state means that the valve spring 4 has a preload force. This can also be understood as the valve spring 4 being compressed to one-tenth, one-fifteenth, one-twentieth, etc., when the valve cover is closed. At this time, the valve spring 4 exerts an upward preload elastic force on the rocker arm 21. When the valve cover is open, the valve camshaft 1 presses down on the rocker arm 21, and the valve spring 4 is in a compressed state. This compression state can be one-third, one-quarter, one-fifth, etc. At this time, the rocker arm 21 presses down on the valve and overcomes the elastic force of the valve spring 4, causing the valve to open.

[0113] An embodiment of the present invention also discloses a device for adjusting valve spring force, wherein the rocker arm assembly 2 includes a rocker arm top post 23 and a rocker arm assembly, and the rocker arm assembly includes a rocker arm 21 and a follower part 22.

[0114] The rocker arm top post 23 can swing to support one end of the rocker arm 21 away from the valve stem 3, and the other end of the rocker arm 21 extends to the lower part of the transmission mechanism and abuts against the end of the valve stem 3 near the transmission mechanism.

[0115] The follower 22 is located in the middle of the rocker arm 21, below the valve camshaft 1, and in contact with the valve camshaft 1. When the valve camshaft 1 rotates, the valve camshaft 1 can push the follower 22 and cause the rocker arm 21 to swing around the rocker arm top post 23.

[0116] Specifically, in this embodiment, the rocker arm top post 23 serves as the fulcrum for the rotation of the rocker arm 21. The valve camshaft 1 can push the rocker arm 21, and the cam 71 structure on the valve camshaft 1 enables the rocker arm 21 to reciprocate, thereby controlling the continuous switching of the valve cover between open and closed states. Furthermore, the follower part 22 provided on the rocker arm 21 can reduce the friction between the valve camshaft 1 and the rocker arm 21, improving the working efficiency of the valve camshaft 1 and the rocker arm assembly 2.

[0117] It should be noted that the rocker arm assembly also includes components such as a pin for mounting the follower part 22. The follower part 22 can be configured as a rotary wheel, a disc, a turntable, or other structure, and the follower part 22 can be located directly below, to the side below, or in other positions on the valve camshaft 1. This embodiment does not specifically limit this.

[0118] Embodiments of the present invention also disclose a device for adjusting valve spring force, wherein the valve assembly includes a pair of valve assemblies spaced apart along the length direction of the drive mechanism, and each valve assembly includes a valve camshaft 1, a rocker arm assembly 2, and at least one valve assembly.

[0119] At least one cam 71 is provided on the outer wall of the valve camshaft 1 along the axial direction of the valve camshaft 1, and each cam 71 is located on one side of a corresponding rocker arm assembly 2.

[0120] Specifically, in this embodiment, a pair of valve assemblies are provided, corresponding to the intake valve mechanism and exhaust valve mechanism of the internal combustion engine, and each valve assembly includes a valve camshaft 1, a rocker arm assembly 2, and at least one valve assembly. This ensures that the valve assemblies can operate normally.

[0121] More specifically, in this embodiment, see Figure 1 and Figure 5 The method of pressing the valve opening and closing by the camshaft 7 is creatively improved so that the camshaft 7 presses the rocker arm assembly 2, and the rocker arm assembly 2 swings and drives the valve opening and closing. The function of this is:

[0122] One end of the rocker arm assembly 2 passes through the lug 82 and is positioned below the lug 82 and the camshaft 7. It swings within the space formed by the lug 82, driving the valve stem 3 to reciprocate, thereby opening and closing the valve cover. This design ensures that the rocker arm assembly 2 does not interfere with the camshaft 7 and the adjusting base 8. It also ensures that the adjusting base 8 can operate normally and adjust, and that the camshaft 7 and the valve camshaft 1 are positioned parallel to each other on both sides. This ensures that the camshaft 7 and the valve camshaft 1 do not interfere with each other during rotation.

[0123] An embodiment of the present invention also discloses a device for adjusting valve spring force. The driving mechanism includes a driver 5, a drive shaft, and a drive wheel. The drive shaft is connected to the output end of the driver 5, and the driver 5 can drive the drive shaft to rotate. The drive shaft is configured as a worm shaft, and the outer wall surface of the worm shaft is provided with worm teeth along the length direction. The drive wheel is a worm wheel 6 adapted to the worm teeth. When the driver 5 drives the worm shaft to rotate, the worm shaft drives the worm wheel 6 to rotate.

[0124] Specifically, in this embodiment, a driver 5 drives the transmission shaft to rotate. The transmission shaft and transmission wheel constitute a reduction mechanism, which can reduce the rotational speed of the driver 5, making it easier for the driver 5 to control the rotation of the transmission shaft. Furthermore, the transmission shaft and transmission wheel are configured as a worm gear 6 and a worm to improve transmission efficiency.

[0125] More specifically, in this embodiment, the driver 5 can be an electric motor, a hydraulic motor, or the like. The transmission shaft and transmission wheel can also be a rack and pinion mechanism, a lead screw mechanism, or other mechanisms. Those skilled in the art can select the appropriate mechanism according to actual needs, and this embodiment does not impose any specific limitations on this.

[0126] An embodiment of the present invention also discloses a device for adjusting valve spring force. A connecting hole structure 61 is provided at the center of the worm gear 6. The connecting hole structure 61 includes any one of a square hole, a spline hole, or a semi-circular hole. A shaft diameter structure 72 adapted to the connecting hole is provided at one end of the transmission mechanism near the worm gear (see [link to original text]). Figure 3 The shaft diameter structure 72 includes any one of a square shaft, a splined shaft, or a semi-circular shaft.

[0127] Specifically, in this embodiment, a pentagonal hole, a hexagonal hole, or other polygonal hole can be provided at the center of the worm gear 6, or other snap-fit ​​grooves can be provided, such as spline holes, semi-circular holes, etc.; the corresponding transmission mechanism is provided at one end near the worm gear 6 as a corresponding polygonal shaft or a snap-fit ​​shaft that matches the snap-fit ​​groove. This embodiment does not make specific limitations on this.

[0128] More specifically, in this embodiment, the transmission mechanism is fixedly mounted on the worm gear 6 by the cooperation of the connecting hole structure 61 and the shaft diameter structure 72, and the worm gear 6 can drive the transmission mechanism to rotate when it rotates.

[0129] Embodiments of the present invention also disclose a device for adjusting valve spring force, wherein the valve adjusting assembly further includes a torsion spring disposed at the end of the transmission mechanism away from the worm gear 6.

[0130] The transmission mechanism has a slot at the end away from the worm gear 6, one end of the torsion spring is locked to the torsion spring, and the other end is locked to the cylinder head.

[0131] Specifically, in this embodiment, a torsion spring is provided at the end of the transmission mechanism away from the worm gear 6. One of the torsion spring's legs engages with and is fixedly connected to the slot, while the other leg is fixedly connected to the cylinder head. When the adjusting component rotates, the torsion spring can apply torque to the adjusting component. After the spring base position is adjusted, the torsion spring can reduce the torque used by the driver 5 to control the adjusting component to remain relatively fixed.

[0132] An embodiment of the present invention also discloses a device for adjusting valve spring force. The outer wall of the adjusting base 8 is provided with a groove 81, and a slider adapted to the groove 81 is provided on the cylinder head of the internal combustion engine. The slider is slidably connected to the groove 81. The groove 81 and the slider are used to restrict the rotation of the adjusting base 8 and the transmission mechanism. When the adjusting base 8 moves along the axis of the valve stem 3, the adjusting base 8 can slide along the groove 81. Furthermore, a plurality of oil drain holes 83 are provided on the outer wall of the adjusting base 8 near the spring support surface.

[0133] Specifically, in this embodiment, a sliding groove 81 is provided on the outer wall of the adjusting base 8, and a slider adapted to the sliding groove 81 is provided on the cylinder head of the internal combustion engine. The slider and the sliding groove 81 are slidably connected, which can prevent the adjusting base 8 from deflecting and disengaging from the cam 71. Furthermore, the slider and the sliding groove 81 will not affect the raising and lowering of the adjusting base 8.

[0134] More specifically, in this embodiment, the slide 81 can be set as a "U" shaped groove, a "V" shaped groove, a square groove or other groove structure, and the corresponding slider can be a protrusion, a pulley or other structure. This embodiment does not make specific limitations on this.

[0135] An embodiment of the present invention also discloses a device for adjusting valve spring force, wherein the axial direction of the transmission mechanism is parallel to the axial direction of the valve camshaft 1, and the axial direction of the transmission mechanism is perpendicular to the axial direction of the transmission shaft.

[0136] This configuration ensures that the transmission mechanism and valve camshaft 1 will not interfere with each other.

[0137] Embodiments of the present invention also disclose an internal combustion engine, including a cylinder head, and a device for adjusting valve spring force as described above.

[0138] Specifically, in this embodiment, the internal combustion engine equipped with an adjustable valve spring force device can adjust the position of the spring base according to different operating conditions during operation, thereby adjusting the spring force of the valve spring 4 and adjusting the frictional work that the valve assembly needs to overcome when opening and closing, so that the spring force of the valve spring 4 matches the operating conditions of the internal combustion engine and improves the working efficiency of the internal combustion engine.

[0139] In summary, this invention provides an adjustable valve spring force device and an internal combustion engine. The valve device includes a valve assembly, a drive assembly for driving the valve assembly, and a valve adjustment assembly. The valve adjustment assembly includes a drive mechanism and a transmission mechanism. By providing the valve adjustment assembly, the height of the adjustment base 8 in the valve assembly can be adjusted, thereby adjusting the spring force of the valve spring 4. The automotive electronic control unit (ECU) can drive the drive mechanism to operate according to the operating conditions of the internal combustion engine. The drive mechanism drives the transmission mechanism to rotate, thereby adjusting the height of the adjustment base 8 and adjusting the spring force of the valve spring 4, so that the spring force of the valve spring 4 is adapted to the operating conditions of the internal combustion engine, reducing the frictional power consumption caused by the large valve spring force.

[0140] Furthermore, once the transmission mechanism controls the adjusting base 8 to complete the position adjustment, the transmission mechanism stops rotating, and the position of the adjusting base 8 along the axis of the valve stem 3 remains unchanged. At this time, the spring force of the valve spring 4 remains unchanged, thus enabling it to adapt consistently to different operating conditions. In addition, the height of the adjusting base 8 can be continuously and smoothly adjusted through the transmission mechanism, thereby continuously adjusting the spring force of the valve spring 4.

[0141] Further, see Figure 1 , Figure 5 and Figure 6 The working process and operation of the adjustable valve spring force device provided in this embodiment will be explained as follows:

[0142] First, in this embodiment, when the valve device is working normally, the valve camshaft 1 drives the rocker arm assembly 2 to swing, and then the rocker arm assembly 2 drives the valve stem 3 and valve cover to switch between open and closed states, thereby realizing the control of the opening and closing of the valve.

[0143] When it is necessary to adjust the spring force of the valve spring 4, the spring force of the valve spring 4 can be adjusted by adjusting the height of the adjusting base 8. At this time, the driver 5 rotates, which drives the transmission mechanism to rotate through the drive shaft and worm gear 6. In this embodiment, the transmission mechanism is a camshaft 7. During the rotation of the camshaft 7, it can pull the adjusting base 8, which is equipped with a lifting lug unit, to switch between an upward and a downward state, thereby adjusting the spring force of the valve spring 4. Furthermore, the camshaft 7 can rotate continuously in one direction, or it can switch between a first direction and a second direction.

[0144] Furthermore, since the rocker arm 21 passes through the lug unit and swings between the lug unit and the camshaft 7, the rocker arm 21 will not affect the height of the camshaft 7 adjusting the base 8 and the spring force of the valve spring 4. The camshaft 7 and the valve camshaft 1 are arranged parallel and spaced apart, and will not interfere with each other.

[0145] Example 2

[0146] As another preferred embodiment, the present invention also discloses a device for adjusting valve spring force. It should be noted that the difference between this embodiment and Embodiment 1 lies only in the structure and arrangement of the adjusting base 8. The valve assembly, drive assembly, and other structures in the valve adjusting assembly are the same as in Embodiment 1. The transmission mechanism is a camshaft 7. The drive mechanism drives the camshaft 7 to rotate about a direction perpendicular to the axis of the valve stem 3. The end face of the adjusting base 8 near the drive assembly is movably connected to the outer peripheral surface of the cam 71 of the camshaft 7. When the camshaft 7 rotates, the end face can move up and down in a direction perpendicular to the axis of the camshaft 7.

[0147] When the camshaft 7 rotates in the first direction, the cam 71 drives the adjusting base 8 to move away from the camshaft 7 along the axial direction of the valve stem 3 until the adjusting base 8 reaches the farthest position away from the camshaft 7.

[0148] When the camshaft 7 rotates in the second direction, the cam 71 pushes the adjusting base 8 to move toward the camshaft 7 along the axial direction of the valve stem 3 until the adjusting base 8 reaches the closest position to the camshaft 7.

[0149] Specifically, it should be noted that the drive mechanism in this embodiment and embodiment 1 both use a camshaft 7. The difference is that in embodiment 1, the adjustment base 8 is hung on the camshaft 7 by setting a lug unit. When the camshaft 7 rotates, it is equivalent to switching the adjustment base 8 between pulling up and lowering.

[0150] In this embodiment, the end face of the adjusting base 8 near the drive assembly is movably connected to the lower part of the camshaft 7. That is, in embodiment 1, it is hung on the upper part of the camshaft 7, while in this embodiment, it is movably embedded in the lower part of the camshaft 7. Furthermore, in embodiment 1, the height is adjusted by pulling up the adjusting base 8, while in this embodiment, the height is adjusted by pressing down the adjusting base 8.

[0151] Specifically, to allow the adjusting base 8 to move when the camshaft 7 rotates, the end of the adjusting base 8 closest to the camshaft 7 can be extended so that the adjusting base 8 rests against the lower part of the camshaft 7. When the protruding part on the cam 71 rotates downward, the cam 71 presses the adjusting base 8 downward. When the protruding part on the camshaft 7 rotates upward, because the valve spring 4 has an initial preload, the adjusting base 8 will move upward under the push of the valve spring 4 and always remain in contact with the lower part of the camshaft 7. This allows for height adjustment of the adjusting base 8, thereby adjusting the spring force of the valve spring 4. Furthermore, the extended end of the adjusting base 8 is provided with a through hole for the rocker arm assembly 2 to move and drive the valve opening and closing.

[0152] More specifically, to enable the camshaft 7 to press the adjusting base 8 when rotating, a slot surrounding the cam 71 can be provided on the outer peripheral surface of the cam 71. A movable connecting part is provided at the end of the adjusting base 8 near the cam 71, and this movable connecting part is movably disposed within the slot. For example, the slot can be a "T" shaped slot, and the movable connecting part can be a pulley, which is slidably disposed within the "T" shaped slot. The pulley is connected to the end of the adjusting base 8 near the cam 71 via a connecting rod. With this arrangement, the cam 71, pulley, connecting rod, and adjusting base 8 constitute a cam 71 mechanism. When the cam 71 rotates, the annular "T" shaped slot on the cam 71 rotates, and due to the change in height of the cam 71 during rotation, the adjusting base 8 rises or falls, thereby changing the spring force on the valve spring 4.

[0153] More specifically, in this embodiment, the transmission mechanism is a camshaft 7, and the end face of the adjusting base 8 near the drive assembly is movably connected to the outer peripheral surface of the cam 71 of the camshaft 7. This is equivalent to movably setting the adjusting base 8 at the lower part of the outer peripheral surface of the cam 71. When the protrusion on the cam 71 rotates downwards, the protrusion presses the adjusting base 8 downwards; when the protrusion on the cam 71 rotates upwards, the adjusting base 8 moves upwards. With this arrangement of setting the adjusting base 8 below the camshaft 7, when the camshaft 7 rotates, the adjustment direction of the adjusting base 8 is exactly opposite to that of the cam 71 suspended from the outer peripheral surface of the cam 71 by the lifting lug unit.

[0154] Furthermore, with this configuration, when the cam 71 rotates, it can also drive the adjusting base 8 to continuously switch between rising and falling states along the axial direction of the valve stem 3, thus enabling continuous adjustment of the spring force of the valve spring 4. In addition, the valve assembly opening and closing, as well as the adjustment method and principle of the valve adjusting assembly, are the same in this embodiment as in Embodiment 1, and will not be repeated here.

[0155] Example 3

[0156] As another preferred embodiment, the present invention also discloses a device for adjusting valve spring force. It should be noted that the difference between this embodiment and Embodiment 1 lies only in the structure of the transmission mechanism; the other structures in the valve assembly, drive assembly, and valve adjustment assembly are the same as in Embodiment 1. Specifically, the transmission mechanism is an eccentric shaft, and the drive mechanism drives the eccentric shaft to rotate about a direction perpendicular to the axial direction of the valve stem 3. The end face of the adjusting base 8 near the drive assembly is movably connected to the outer circumferential surface of the eccentric shaft diameter.

[0157] When the eccentric shaft rotates in the first direction, the eccentric shaft diameter drives the adjusting base 8 to move toward the eccentric shaft along the axial direction of the valve stem 3 until the adjusting base 8 reaches the closest position to the eccentric shaft.

[0158] When the eccentric shaft rotates in the second direction, the eccentric shaft diameter pushes the adjusting base 8 to move away from the eccentric shaft along the axial direction of the valve stem 3 until the adjusting base 8 reaches the farthest position away from the eccentric shaft.

[0159] Specifically, in this embodiment, the structure of the adjusting base 8 can be the same as that of the adjusting base 8 in Embodiment 1. A lifting lug unit is provided at one end of the adjusting base 8 near the eccentric shaft diameter, and the adjusting base 8 is suspended on the adjusting base 8 via the lifting lug unit. When the eccentric shaft moves radially upward, it drives the adjusting base 8 to move upward; when the eccentric shaft moves radially downward, it drives the adjusting base 8 to move downward. Those skilled in the art can also configure the adjusting base 8 with other structures that fit around the eccentric shaft diameter, such as a suspended basket, etc. This embodiment does not specifically limit this.

[0160] More specifically, in this embodiment, the transmission mechanism is configured as an eccentric shaft, with the end face of the adjusting base 8 near the drive assembly movably connected to the outer circumferential surface of the eccentric shaft diameter. This configuration is similar to the principle of hanging the adjusting base 8 on the cam 71 via the lug unit. Furthermore, the eccentric shaft diameter corresponds to the protrusion on the cam 71. When the eccentric shaft rotates in the first direction, the eccentric shaft diameter drives the adjusting base 8 to move along the axial direction of the valve stem 3 towards the eccentric shaft, causing the adjusting base 8 to rise. When the eccentric shaft rotates in the second direction, the eccentric shaft diameter pushes the adjusting base 8 away from the eccentric shaft along the axial direction of the valve stem 3, causing the adjusting base 8 to descend.

[0161] Furthermore, with this configuration, when the eccentric shaft rotates, it can also drive the adjusting base 8 to continuously switch between rising and falling states along the axial direction of the valve stem 3, thereby achieving continuous adjustment of the spring force of the valve spring 4. In addition, the valve assembly opening and closing, as well as the adjustment method and principle of the valve adjusting assembly, are the same in this embodiment as in Embodiment 1, and will not be repeated here.

[0162] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.

Claims

1. A device for adjusting valve spring force, characterized in that, The valve assembly includes a valve assembly, a drive assembly for driving the valve assembly, and a valve adjustment assembly; wherein The valve assembly includes at least a valve, a valve spring, and an adjusting base. The valve spring is sleeved on the valve stem along the valve stem axis, with one end fixedly connected to the end of the valve near the drive assembly. The other end of the valve spring is sleeved within the adjusting base. The valve can be displaced along the valve stem axis through the adjusting base. The valve adjustment assembly includes a drive mechanism and a transmission mechanism. The drive mechanism is drively connected to the transmission mechanism, and the transmission mechanism is drively connected to one end of the adjustment base near the drive assembly. The drive mechanism drives the transmission mechanism to rotate in a first direction or a second direction opposite to the first direction, thereby driving the adjustment base to move along the valve stem axis of the valve and adjusting the spring force of the valve spring. When the transmission mechanism is not rotating, the position of the adjustment base in the valve stem axis direction remains unchanged.

2. The device for adjusting valve spring force as described in claim 1, characterized in that, The transmission mechanism is configured as a camshaft, and the drive mechanism drives the camshaft to rotate about a direction perpendicular to the valve stem axis of the valve. The adjusting base is provided with a through hole at one end near the drive assembly, allowing the camshaft to pass through. The outer peripheral surface of the cam of the camshaft abuts against the inner peripheral surface of the through hole.

3. The device for adjusting valve spring force as described in claim 2, characterized in that, The adjusting base has an extension extending toward the camshaft at one end near the drive assembly. The through hole is formed through the extension, and in the extension direction of the camshaft, the inner circumferential surfaces of the through holes at both ends of the extension abut against the corresponding outer circumferential surfaces of the cam.

4. The device for adjusting valve spring force as described in claim 3, characterized in that, The extension is a lug unit fixedly disposed at one end of the adjustment base. The lug unit includes two lugs symmetrically arranged along the axial direction of the adjustment base. Each lug is hung on the corresponding cam. A spring support surface is provided at the end of the adjustment base away from the lug unit. One end of the valve spring abuts against the spring support surface. in When the camshaft rotates in the first direction, the cam drives the adjusting base to move toward the camshaft along the valve stem axis until the adjusting base reaches the closest position to the camshaft. When the camshaft rotates in the second direction, the cam drives the adjusting base to move away from the camshaft along the valve stem axis until the adjusting base reaches the furthest position away from the camshaft.

5. The device for adjusting valve spring force as described in claim 1, characterized in that, The transmission mechanism is a camshaft, and the drive mechanism drives the camshaft to rotate about a direction perpendicular to the valve stem axis of the valve. The end face of the adjusting base near the drive assembly is movably connected to the outer peripheral surface of the cam of the camshaft. When the camshaft rotates, the end face can move up and down in a direction perpendicular to the axis of the camshaft. in When the camshaft rotates in the first direction, the cam drives the adjusting base to move away from the camshaft along the valve stem axis until the adjusting base reaches the furthest position away from the camshaft. When the camshaft rotates in the second direction, the cam pushes the adjusting base to move toward the camshaft along the valve stem axis until the adjusting base reaches the closest position to the camshaft.

6. The device for adjusting valve spring force as described in claim 1, characterized in that, The transmission mechanism is an eccentric shaft, and the drive mechanism drives the eccentric shaft to rotate around a direction perpendicular to the valve stem axis of the valve. The end face of the adjusting base near the drive assembly is movably connected to the outer peripheral surface of the eccentric shaft diameter. in When the eccentric shaft rotates along the first direction, the eccentric shaft diameter drives the adjusting base to move toward the eccentric shaft along the valve stem axis until the adjusting base reaches the closest position to the eccentric shaft. When the eccentric shaft rotates in the second direction, the eccentric shaft pushes the adjusting base to move away from the eccentric shaft along the valve stem axis until the adjusting base reaches the farthest position away from the eccentric shaft.

7. The device for adjusting valve spring force as described in any one of claims 1-6, characterized in that, The drive assembly includes a valve camshaft and a rocker arm assembly, wherein The valve camshaft is disposed on one side of the rocker arm assembly. The rocker arm assembly is drivenly connected to the valve camshaft. One end of the rocker arm assembly extends to the lower part of the transmission mechanism and abuts against the top of the valve stem. The valve camshaft can drive the rocker arm assembly to swing and drive the valve assembly to reciprocate along the valve stem axis of the valve, thereby driving the valve cover of the valve to switch between closed and open states. When the valve cover of the valve is in the closed state, the valve spring is in the preloaded state, and the combustion chamber of the internal combustion engine is closed to the air passage; When the valve cover is in the open state, the valve spring is in the compressed state, and the combustion chamber of the internal combustion engine is open to the air passage.

8. The device for adjusting valve spring force as described in claim 7, characterized in that, The driving mechanism includes a driver, a drive shaft, and a drive wheel. The drive shaft is connected to the output end of the driver, and the driver can drive the drive shaft to rotate. The transmission shaft is configured as a worm shaft, and the outer wall surface of the worm shaft is provided with worm teeth along the length direction. The transmission wheel is a worm wheel adapted to the worm teeth. When the driver drives the worm shaft to rotate, the worm shaft drives the worm wheel to rotate.

9. The device for adjusting valve spring force as described in claim 8, characterized in that, The worm gear has a connecting hole structure at its center, which can be any one of a square hole, a spline hole, or a semi-circular hole. The transmission mechanism has a shaft diameter structure that matches the connecting hole at one end near the worm gear, which can be any one of a square shaft, a spline shaft, or a semi-circular shaft.

10. The device for adjusting valve spring force as described in claim 9, characterized in that, The valve adjustment assembly also includes a torsion spring, which is disposed at the end of the transmission mechanism away from the worm gear; and The transmission mechanism has a slot at the end away from the worm gear, one end of the torsion spring is engaged in the slot, and the other end is engaged on the cylinder head.

11. The device for adjusting valve spring force as described in claim 10, characterized in that, The outer wall of the adjusting base is provided with a sliding groove, and the cylinder head of the internal combustion engine is provided with a slider adapted to the sliding groove. The slider is slidably connected to the sliding groove. The sliding groove and the slider are used to restrict the rotation of the adjusting base and the transmission mechanism. When the adjusting base moves along the valve stem axis of the valve, the adjusting base can slide along the sliding groove; and Multiple oil drain holes are also provided on the outer wall surface of the adjustment base near the spring support surface.

12. The device for adjusting valve spring force as described in claim 11, characterized in that, The axis of the transmission mechanism is parallel to the axis of the valve camshaft, and the axis of the transmission mechanism is perpendicular to the axis of the transmission shaft.

13. An internal combustion engine, comprising a cylinder head, characterized in that, It also includes the device for adjusting valve spring force as described in any one of claims 1-12.

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