Variable lift valve structure and lift control method

Abstract

The application discloses a variable-lift valve structure and a lift control method, and is applied to the field of engine valve control. The variable-lift valve structure comprises a base, a follower and a cam group, one end of the base is movably connected with the follower, the other end of the base is movably connected with the cam group, the base selectively transmits extrusion force of the cam group to the follower, and the follower is connected with a valve. The application comprises two states, in the first state, the base is connected with the follower, and the cam group transmits the extrusion force to the follower; and in the second state, the base is separated from the follower. The application has the advantages of simple structure, saving of limited layout space of an engine, convenience for wide range popularization, provision of different air intake and exhaust amounts at different speeds, and good adjustment of lift effect.

Description

Technical Field

[0001] This invention belongs to the technical field of engine valve control mechanism, and in particular to a valve structure with variable lift and a lift control method. Background Technology

[0002] At a specific timing, the engine operates at its highest efficiency when the intake and exhaust ports reach a certain lift. However, the required lift for optimal engine efficiency varies at different speeds, and the shape of the camshaft is the most critical factor affecting this lift. Since the camshaft cannot be changed during engine operation, its profile is fixed. Therefore, the camshaft assembly is usually a stopgap configuration. Any given camshaft is only perfect at a certain engine speed; at other speeds, the engine will not perform well. A fixed lift cannot provide the necessary effective control of intake and exhaust at different speeds.

[0003] One existing technology aims to control the intake and exhaust volume by setting up a turbocharger to achieve optimal engine efficiency, but this method has a complex structure and still cannot provide the optimal intake and exhaust volume for different load conditions; another existing technology provides a device that changes the lift through a complex mechanical transmission, which also generally suffers from the defects of complex structure and high manufacturing cost.

[0004] In summary, existing technologies are complex in structure and difficult to incorporate into the limited space of an engine; they are costly and difficult to promote on a large scale; and their lift adjustment effect is poor, so the engine cannot effectively provide the optimal intake and exhaust volume at different speeds. Summary of the Invention

[0005] The purpose of this invention is to provide a variable lift valve structure and lift control method, which achieves the following effects: simple structure, saving limited engine layout space, easy to promote on a large scale, and high commercial value; it can provide different intake and exhaust volumes at different speeds and has good lift adjustment effect.

[0006] To achieve the above objectives, the present invention provides a variable lift valve structure, comprising: a rocker arm, which is a two-section structure including multiple base members and a driven member; each base member includes a first shaft that passes through the middle of the base member, and the multiple base members are arranged on the first shaft; the driven member is disposed on the second side of the base member; a cam assembly, movably connected to the first side of the base member, including a second shaft and multiple cams; the cams are arranged on the second shaft and are correspondingly positioned to match the base members; the second shaft is parallel to the first shaft; the shape and size of the cams in the cam assembly are configured to match the required lift; the cam assembly rotates about the second shaft; during rotation, the cam assembly presses against the first side of the base member, causing the base member to rotate about the first shaft; wherein, the base member includes a first state and a second state; in the first state, the base member is separated from the driven member; in the second state, the base member is fixed to the driven member, driving the driven member; the base member selectively transitions to the second state, connecting the cams to the driven member.

[0007] In one or more embodiments, the base member further includes a piston rod and a first through hole, the first through hole being located on a second side of the base member, and the piston rod being movably connected inside and outside the first through hole; the follower member further includes a plurality of grooves, the shape of which matches the piston rod.

[0008] In one or more embodiments, when the base is in a first state, the piston rod is located inside the first through hole; when the base is in a second state, one end of the piston rod protrudes outside the first through hole and is fixedly connected to the follower groove.

[0009] In one or more embodiments, the base component further includes a third shaft and a roller. The third shaft is arranged parallel to the first shaft and is located on a first side of the base component. The roller is sleeved on the third shaft, and the position of the roller corresponds to the position of the cam. In one or more embodiments, the shape and size of the cam assembly are matched with the required lift.

[0010] In one or more embodiments, the base component further includes a control mechanism, which includes a main oil pipe and multiple branch oil pipes. The main oil pipe is arranged parallel to the first shaft. One end of the main oil pipe is an oil inlet and the other end is an oil outlet. One end of each branch oil pipe is an oil inlet and the other end is connected to the main oil pipe. The diameter of the end of the branch oil pipe connected to the main oil pipe decreases as it approaches the main oil pipe.

[0011] In one or more embodiments, the control mechanism further includes a spring ball valve located within the oil pipe branch and positioned near the oil pipe main, for the purpose of movably sealing the connection between the oil pipe branch and the oil pipe main.

[0012] In one or more embodiments, the oil pipe branch further includes an oil drain port and a multi-way solenoid valve. The oil drain port branches off from the oil pipe branch and is equipped with a multi-way solenoid valve for selecting the oil drain path. In one or more embodiments, the oil drain port is equipped with a multi-way solenoid valve for selecting the oil drain path.

[0013] In one or more embodiments, the follower further includes a valve stem, the valve stem further including a valve cover, the valve cover having an elephant foot-shaped structure.

[0014] This invention provides a lift control method using a variable lift valve structure, comprising the following steps: S100: determining the required base component according to the required lift; S200: setting the required base component to a second state, and setting the remaining base components to a first state; S300: the piston rod in the second state abuts against the groove and continues to apply stress, the piston rod pushes the base component to rotate, and the first side of the required base component sinks; S400: the cam assembly rotates.

[0015] In one or more embodiments, step S300 further includes step S310, which includes: positioning the second shaft below the base member in the first side-sunken state, wherein the distance between the second shaft and the roller is set as the minimum radius of the cam.

[0016] Compared with the prior art, the various technical solutions and embodiments provided by the present invention include at least the following technical effects or advantages:

[0017] 1. By setting multiple base components in the first state and selectively activating a single base component to enter the second state, the cam assembly can precisely and variably control the lift, resulting in good control performance; 2. By driving the piston rod with hydraulic pressure, no other power unit is needed, saving space; 3. By using a multi-way solenoid valve to control the opening and closing of the drain port with lower power and adjusting the direction of higher power, power consumption is saved; 4. The layout of the cam assembly reduces wasted work and improves mechanical efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure and connection method of a variable lift valve structure with two base components in an embodiment of the present invention.

[0019] Figure 2 This is a front view schematic diagram of a variable lift valve structure with two base components according to an embodiment of the present invention;

[0020] Figure 3 This is a top view schematic diagram of a variable lift valve structure with two base components according to an embodiment of the present invention;

[0021] Figure 4 This is a cross-sectional schematic diagram of the left piston rod in the first state of a variable lift valve structure with two base components in an embodiment of the present invention.

[0022] Figure 5 This is a cross-sectional schematic diagram of the left piston rod in the second state of a variable lift valve structure with two base components in an embodiment of the present invention.

[0023] The labels in the diagram represent: 1-base component, 11-control mechanism, 111-main oil pipe, 112-branch oil pipe, 113-spring ball valve, 114-multi-way solenoid valve, 12-third shaft, 13-first shaft, 14-piston rod, 15-first through hole, 16-roller, 2-follower component, 21-valve rod, 211-valve cover, 3-cam assembly, 31-second shaft, 4-oil pressure direction. Detailed Implementation

[0024] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises", "made for", etc., shall be understood to include the stated elements or components, without excluding other elements or other components.

[0025] The purpose of this invention is to provide a variable lift valve structure that is simple in structure, saves limited engine space, is easy to promote on a large scale, and has high commercial value; it can provide different intake and exhaust volumes at different speeds and has a good lift adjustment effect.

[0026] Example 1:

[0027] This embodiment provides a variable lift valve structure, such as Figures 1 to 5As shown, it includes: a rocker arm, which has a two-section structure, comprising multiple base components 1 and driven components 2. Each base component 1 includes a first shaft 13 that passes through the middle of the base component 1, and multiple base components 1 are arranged on the first shaft 13; the driven components 2 are disposed on the second side of the base component 1; and a cam assembly 3, movably connected to the first side of the base component 1, including a second shaft 31 and multiple cams. The cams are arranged on the second shaft 31 and are positioned corresponding to the base components 1. The second shaft 31 is parallel to the first shaft 13. The cam assembly 3 has a cam shape and size that are matched to the required lift. The cam assembly 3 rotates around the second shaft 31. During the rotation of the cam assembly, it presses against the first side of the base member 1, causing the base member 1 to rotate around the first shaft 13. The base member 1 has a first state and a second state. In the first state, the base member 1 is separated from the follower 2. In the second state, the base member 1 is fixed to the follower 2, driving the follower 2. The base member 1 selectively changes to the second state, connecting the cam assembly 3 and the follower 2.

[0028] Furthermore, the base component 1 also includes a piston rod 14 and a first through hole 15, the first through hole 15 being located on the second side of the base component, and the piston rod 14 being movably connected inside and outside the first through hole 15; the driven component 2 also includes a plurality of grooves, the shape of which matches the piston rod 14. When the base component 1 is in a first state, the piston rod 14 is located inside the first through hole 15; when the base component is in a second state, one end of the piston rod 14 protrudes outside the first through hole 15 and is fixedly mated in the groove of the driven component 2.

[0029] Specifically, to change valve lift while maintaining structural simplicity, this embodiment provides a variable lift valve structure, mainly comprising a two-section rocker arm, namely a base 1 and a driven member 2. The first side of the base 1 is movably connected to a cam assembly 3. When the cam assembly 3 rotates, the cam periodically lifts the first side of the base 1. The base 1 performs a rocker motion about a first shaft 13, i.e., one end is subjected to force, giving the other end a tendency to move. The second side of the base 1 sinks, and the surface of the second side includes a first through hole 15 recessed into the base 1. The piston rod 14 is shaped to fit the first through hole, and the piston rod 14 moves in and out of the first through hole 15 in a sealed manner. When the piston rod 14 protrudes from the first through hole... At 15 o'clock, one end is inserted into the groove of the follower 2 and fixed. The base 1 realizes the function of connecting the follower 2 and the cam group 3 and transmitting force. The follower 2 has a groove at one end near the base 1, which matches the shape of the piston rod 14 and is used to fix the piston rod 14. The other end of the follower 2 is provided with a valve stem 21 to connect the valve. The valve stem 21 is coaxially arranged with the air inlet. The valve stem 21 also includes a valve cover 211. The valve cover 211 is arranged at the air inlet and outlet positions of the valve stem 21. The valve stem 21 rotates circumferentially relative to the first shaft 13 to drive the valve cover 211 to open and close the valve. The range of motion of the valve stem 21 determines the valve lift.

[0030] When the structure described in this embodiment is working, it includes a first state and a second state. In the first state, the piston rod 14 is in the first through hole 15 and is separated from the follower 2. When it is necessary to change the lift, the piston rod 14 is protruded and inserted into the groove of the follower 2 and fixed, thus changing to the second state. In the second state, the piston rod 14 is fixed in the groove of the follower 2, the base 1 and the follower are relatively stationary, and the force generated by the cam group 3 pressing the roller 16 drives the base 1 and the follower 2 to open and close the valve as a whole. The shape and size of the cam can be designed by those skilled in the art to control the valve lift.

[0031] Among them, as attached Figures 1 to 5 As shown, the first side refers to the direction of the base 1 toward the cam assembly 3; the second side refers to the end of the base 1 toward the follower 2, and the first shaft is as follows: Figure 1 As shown, the arrangement is perpendicular to the direction from the first side to the second side. The description in the embodiments is not intended to limit the invention to the precise form disclosed, but rather to disclose one implementation so that those skilled in the art can understand that many changes can be made in ways not described but deduced from the invention or other implementations.

[0032] Furthermore, to more efficiently address: 1. which cam drives the valve opening and closing at different speeds to control lift; 2. setting more lift modes at various speeds, making lift changes more precise and continuous; in this embodiment, the base component 1 can theoretically be set an unlimited number, making lift control non-discrete and more precise. The specific number of base components 1 can be determined by those skilled in the art as needed, such as the number corresponding to the number of engine gears, or more than 10 base components 1 for high-performance vehicles, etc. (Appendix) Figures 1 to 3 This is a schematic diagram of two base members 1 in this embodiment, so that those skilled in the art can understand. When the speed changes and the lift needs to be switched, one or more base members 1 become the first state, and another one or more base members 1 become the second state. In this embodiment, all cams of the cam group 3, regardless of the state of the base member, will squeeze and drive the corresponding base member 1 to move repeatedly around the first shaft 13. However, only the base member 1 in the second state drives the follower 2 to move, which solves the problem that the superposition of multiple cam rotations affects the accuracy of the lift.

[0033] In a preferred embodiment of this invention, the base also includes a third shaft 12 and a roller 16. The third shaft 12 passes through the first side of the base 1 parallel to the first shaft 13. The roller 16 is sleeved on the third shaft 12, and the position of the roller is set in accordance with the position of the cam.

[0034] Specifically, in order to reduce the wear of the base component 1, a roller 16 is connected to the third shaft 12 on the first side. When the cam group 3 moves to impact the first side, the impact force is transmitted to the third shaft 12 to drive the base component 1 to move. The roller 16 reduces the impact damage to the base component 1.

[0035] In a preferred embodiment of this invention, the shape and size of the cam group 3 are matched with the required lift; specifically, as shown in the example below. Figures 1 to 3 As shown, in order to control the lift more precisely, the cam shape of the cam group 3 will change to drive the follower 2 to swing, thereby determining the lift. The cam shape of the cam group 3 can be determined by those skilled in the art as needed, and the specific implementation will not be described in detail here. When the rotation speed of the cam group 3 remains constant, the timing can also be controlled to a certain extent by designing a periodically changing cam shape.

[0036] In a preferred embodiment of this invention, the base component 1 further includes a control mechanism 11, which includes a main oil pipe 111 and a plurality of branch oil pipes 112. The main oil pipe 111 and the branch oil pipes 112 are parallel to the first shaft 13. One end of the main oil pipe 111 is an oil inlet and the other end is an oil outlet. One end of the branch oil pipe 112 is an oil inlet and the other end is connected to the main oil pipe 111. The diameter of the end of the branch oil pipe 112 connected to the main oil pipe 111 decreases as it approaches the main oil pipe 111.

[0037] Specifically, such as Figures 1 to 5 As shown, in order to control the switching state of the corresponding base component 1 and provide power to the piston rod 14, the base component also includes a power mechanism 11, which includes an oil pipe main 111, multiple oil pipe branches 112, a spring ball valve 113, and a multi-way solenoid valve 114, located as shown in the figure. Figure 4 , Figure 5 As shown, the specific number of oil pipe branches 112 corresponds to the number of base components 1, and they are disposed inside the base component 1. The diameter of the end of the oil pipe branch 112 connected to the oil pipe main 111 decreases as it approaches the oil pipe main 111. The spring ball valve 113 is located inside the end of the oil pipe branch 112 connected to the oil pipe main 111. When the spring ball valve 113 is subjected to oil pressure toward the oil pipe main 111, it seals the connection between the oil pipe branch 112 and the oil pipe main 111; when the spring ball valve 113 is subjected to oil pressure in the opposite direction of the oil pipe main 111, it seals the connection between the oil pipe branch 112 and the oil pipe main 111. The connection between the oil pipe branch 112 and the oil pipe main 111 is opened; one end of the first through hole 15 is open to the outside, and the other end is connected to the oil pipe branch 112. The piston rod 14 is used to seal the connection between the first through hole 15 and the outside, and is also driven by oil pressure to bulge outward or retract inward into the first through hole 15; the oil pipe branch 112 also includes an oil drain port as a branch, and the multi-way solenoid valve 114 is controlled by an external switch to open and close one or more oil drain ports of the oil pipe main, cleverly controlling the direction of the larger oil pressure with a small force. The description of this preferred embodiment is only for the convenience of those skilled in the art to understand, and the description in the embodiment is not intended to limit the invention to the precise form disclosed.

[0038] When the variable lift valve structure is in operation, when the multi-way solenoid valve 114 controls the oil drain port of the left base 1 to be connected, the liquid inside the control mechanism 11 flows in the indicated direction along the oil pressure direction 4, the spring ball valve 113 opens, and the piston rod 14 retracts into the first through hole 15 under the action of oil pressure. Figure 4 The left-side base component 1 is in the first state; when the lift needs to be changed, the multi-way solenoid valve 114 disconnects the drain port, as shown. Figure 5The liquid inside the control mechanism 11 in the left base component 1 flows in the direction indicated by the oil pressure direction 4. The spring ball valve 113 is blocked, the oil pressure inside the oil pipe branch 112 increases, causing the piston rod 14 to bulge outward, and the base component 1 changes to the second state, completing one state switch.

[0039] In summary, the control mechanism is located within the base component 1 and utilizes the oil pressure of the oil pipeline itself to control the base component 1 connected to the driven component 2. This eliminates the need for an additional power mechanism, saves engine space occupied by the variable lift valve structure, and optimizes costs. The multi-way solenoid valve 114 uses a small force to control a large force, saving energy, and has a good lift-changing effect.

[0040] In a preferred embodiment of this invention, the control mechanism 11 further includes a spring ball valve 113, which is connected to one end of the oil pipe branch 112 and the oil pipe main 111, and is used to movably block the connection between the oil pipe branch 112 and the oil pipe main 111.

[0041] Specifically, in order to control the switching state of the corresponding base component 1 and provide power to the piston rod 14, the specific number of oil pipe branches 112 is matched with the number of base components 1 and is set inside the base component 1. The diameter of the oil pipe branch 112 connected to the oil pipe main 111 decreases as it approaches the oil pipe main 111. The spring ball valve 113 is located inside the end of the oil pipe branch 112 connected to the oil pipe main 111. When the spring ball valve 113 is subjected to oil pressure toward the oil pipe main 111, it blocks the connection between the oil pipe branch 112 and the oil pipe main 111. When the spring ball valve 113 is subjected to oil pressure from the reverse oil pipe main 111, it opens the connection between the oil pipe branch 112 and the oil pipe main 111. One end of the first through hole 15 is open to the outside, and the other end is connected to the oil pipe branch 112. The piston rod 14 is used to seal the connection between the first through hole 15 and the outside, and is also driven by oil pressure to protrude outward or retract inward into the first through hole 15. The oil pipe branch 112 also includes an oil drain port as a branch. The multi-way solenoid valve 114 is controlled by an external switch to open and close the oil drain ports of one or more oil pipe branches. The description of this preferred embodiment is only for the convenience of those skilled in the art, and the description in the embodiment is not intended to limit the invention to the precise form disclosed.

[0042] In a preferred embodiment of this invention, the oil pipe branch 112 further includes an oil drain port, which branches off from the oil pipe branch 112.

[0043] Specifically, to control the switching state of the corresponding base component 1 and provide power to the piston rod 14, the specific number of oil pipe branches 112 is matched with the number of base components 1 and is arranged inside the base component 1. The diameter of the end of the oil pipe branch 112 connected to the oil pipe main 111 decreases as it approaches the oil pipe main 111. The spring ball valve 113 is located inside the end of the oil pipe branch 112 connected to the oil pipe main 111. When the spring ball valve 113 is subjected to oil pressure toward the oil pipe main 111, it seals the connection between the oil pipe branch 112 and the oil pipe main 111; when the spring ball valve 113 is subjected to reverse pressure... When oil pressure is applied to the main oil pipe 111, the connection between the branch oil pipe 112 and the main oil pipe 111 is opened. One end of the first through hole 15 is open to the outside, and the other end is connected to the branch oil pipe 112. The piston rod 14 is used to seal the connection between the first through hole 15 and the outside, and is also driven by oil pressure to bulge outward or retract inward into the first through hole 15. The branch oil pipe 112 also includes a drain port as a branch. The multi-way solenoid valve 114 is controlled by an external switch to open and close one or more drain ports of the branch oil pipe 112, cleverly controlling the direction of the larger oil pressure with a small force. The description of this preferred embodiment is only for the convenience of those skilled in the art, and the description in the embodiment is not intended to limit the invention to the precise form disclosed.

[0044] In a preferred embodiment of this invention, the drain port is equipped with a multi-way solenoid valve 114 for selecting the drain channel.

[0045] Specifically, to control the switching state of the corresponding base component 1 and provide power to the piston rod 14, the specific number of oil pipe branches 112 is matched with the number of base components 1 and is arranged inside the base component 1. The diameter of the end of the oil pipe branch 112 connected to the oil pipe main 111 decreases as it approaches the oil pipe main 111. The spring ball valve 113 is located inside the end of the oil pipe branch 112 connected to the oil pipe main 111. When the spring ball valve 113 is subjected to oil pressure toward the oil pipe main 111, it seals the connection between the oil pipe branch 112 and the oil pipe main 111. When subjected to oil pressure from the reverse oil pipe main 111, the connection between the oil pipe branch 112 and the oil pipe main 111 is opened; one end of the first through hole 15 is open to the outside, and the other end is connected to the oil pipe branch 112; the piston rod 14 is used to seal the connection between the first through hole 15 and the outside, and is also driven by oil pressure to bulge outward or retract inward into the first through hole 15; the oil pipe branch 112 also includes an oil drain port as a branch; the multi-way solenoid valve 114 is controlled by an external switch, and can open and close the oil drain ports of one or more oil pipe branches, cleverly controlling the direction of the larger oil pressure with a small force. This preferred embodiment is described only to facilitate understanding by those skilled in the art, and the description in the embodiment is not intended to limit the invention to the precise form disclosed.

[0046] As a preferred embodiment of this invention, the oil pipe branch 112 can be inserted into and exited by those skilled in the art according to actual needs, forming multiple through holes.

[0047] Example 2:

[0048] This embodiment provides a lift control method, such as Figures 1 to 5 As shown, the variable lift valve structure includes a variable lift valve structure as described in Embodiment 1. At any given time, no more than one piston rod 14 corresponding to the plurality of base members 1 protrudes outward from the base member 1 and is fixedly connected to the groove of the follower member 2. When the variable lift valve structure is working, the piston rod 14 abuts against the groove and continues to apply stress. The piston rod 14 pushes the base member 1 to rotate, and the first side of the base member 1 sinks.

[0049] Since all the cams in the cam group 3 are squeezing and driving the corresponding base 1 when the device described in Embodiment 1 is working, resulting in wasted work, this embodiment provides a better implementation scheme to improve mechanical efficiency.

[0050] Specifically, based on the first embodiment, this embodiment adds the function of piston rod 14. In the second state of the first embodiment, the piston rod 14 has a longer stroke. After abutting against the groove of the follower 2, the piston rod 14 continues to apply stress, pushing the base 1 to rotate around the first shaft 13, causing the first side to sink, forming the second state of this embodiment. This embodiment also changes the position of the cam group. The second shaft 31 and the roller 16 of the base 1 in the first side sinking state are separated by the minimum cam radius. That is, only the base 1 in the second state with the first side sinking can be driven by the cam, while other cams idle and do not perform external work, increasing mechanical efficiency. The shape and size of the cam group 3 are matched with the roller 16, driving only the base 1 in the second state to swing the follower 2, further determining the lift. The description of this embodiment is only for the convenience of those skilled in the art to understand, and the description in the embodiment is not intended to limit the invention to the precise form disclosed.

[0051] In a preferred embodiment of this invention, the second shaft 31 and the roller 16 of the base 1 in the first side-sunken state are spaced apart by the minimum radius of the cam, and the shape and size of the cam group 3 are matched with the roller 16.

[0052] Specifically, to reduce wasted work and increase mechanical efficiency, this embodiment also changes the position of the cam group. The second shaft 31 and the roller 16 of the base member 1 in the first side-sunken state are separated by the minimum cam radius. That is, only the base member 1 in the second state with the first side sunken can be driven by the cam, while other cams idle and do not perform external work, thus increasing mechanical efficiency. The shape and size of the cam group 3 are matched with the roller 16, driving only the swing follower of the base member 1 in the second state, further determining the lift. The description of this preferred embodiment is only for the convenience of those skilled in the art to understand, and the description in the embodiment is not intended to limit the invention to the precise form disclosed.

[0053] Since this embodiment provides a preferred embodiment of a variable lift valve structure, as described in Embodiment 1, various variations and specific examples of the variable lift valve structure provided in Embodiment 1 are also applicable to this embodiment. Through the foregoing detailed description of a variable lift valve structure, those skilled in the art can clearly understand the specific implementation of the preferred embodiment of the variable lift valve structure in this embodiment. Therefore, for the sake of brevity, it will not be described in detail here.

[0054] The above description is only an optional embodiment of this application and is not intended to limit this application. The underwater release device described in the embodiment can be combined with any preferred embodiment to form different implementation schemes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A variable lift valve structure, characterized in that, include: The rocker arm has a two-section structure, including multiple base components and driven components. Each base component includes a first shaft that passes through the middle of the base component, and multiple base components are arranged on the first shaft. The driven components are disposed on the second side of the base component. A cam assembly is movably connected to the first side of the base member, including a second shaft and multiple cams. The cams are arranged on the second shaft and are positioned to correspond with the base member. The second shaft is parallel to the first shaft. The shape and size of the cams in the cam assembly are set to match the required lift. The cam assembly rotates around the second shaft. During rotation, the cam assembly presses against the first side of the base member, causing the base member to rotate around the first shaft. The base component includes a first state and a second state; in the first state, the base component is separated from the follower; in the second state, the first side sinks, and the base component drives the follower by fixing it to the follower; the base component selectively changes to the second state to connect the cam to the follower.

2. The variable lift valve structure as described in claim 1, characterized in that, The base component also includes a piston rod and a first through hole, the first through hole being located on the second side of the base component, and the piston rod being movably connected inside and outside the first through hole; the driven component also includes a plurality of grooves, the shape of which matches the piston rod.

3. The variable lift valve structure as described in claim 2, characterized in that, When the base is in the first state, the piston rod is located in the first through hole; when the base is in the second state, one end of the piston rod protrudes out of the first through hole and is fixed in the groove of the follower.

4. A variable lift valve structure as described in claim 3, characterized in that, The base also includes a third shaft and a roller. The third shaft is arranged parallel to the first shaft and is located on the first side of the base. The roller is sleeved on the third shaft and its position is matched with the position of the cam.

5. A variable lift valve structure as described in claim 4, characterized in that, The base component also includes a control mechanism, which includes a main oil pipe and multiple branch oil pipes. The main oil pipe is arranged parallel to the first shaft. One end of the main oil pipe is an oil inlet and the other end is an oil outlet. One end of each branch oil pipe is an oil inlet and the other end is connected to the main oil pipe. The diameter of the end of the branch oil pipe connected to the main oil pipe decreases as it approaches the main oil pipe.

6. A variable lift valve structure as described in claim 5, characterized in that, The control mechanism also includes a spring ball valve, which is located in the oil pipe branch and positioned near the oil pipe main, for the purpose of movably sealing the connection between the oil pipe branch and the oil pipe main.

7. A variable lift valve structure as described in claim 6, characterized in that, The oil pipe branch also includes an oil drain port and a multi-way solenoid valve. The oil drain port branches off from the oil pipe branch and is equipped with a multi-way solenoid valve for selecting the oil drain channel.

8. A variable lift valve structure as described in claim 7, characterized in that, The driven member also includes a valve stem, and the valve stem further includes a valve cover, which has an elephant foot-shaped structure.

9. A lift control method, employing a variable lift valve structure as described in any one of claims 6 to 7, characterized in that, Includes the following steps: S100: Determine the required base component based on the required lift; S200: Set the required base component to the second state, and set the remaining base components to the first state; S300: The piston rod in the second state abuts against the groove and continues to apply stress, the piston rod pushes the base to rotate, and the first side of the base needs to sink; S400: The cam assembly rotates.

10. The lift control method as described in claim 9, characterized in that, Step S300 further includes step S310, which includes: setting the second shaft below the base member in the first side-sunken state, and setting the distance between the second shaft and the roller as the minimum radius of the cam.

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