Valve driving mechanism and engine system

Abstract

The invention provides a valve driving mechanism and an engine system. The valve driving mechanism comprises a rocker arm assembly, a check valve assembly, an execution plunger assembly and a ball pin seat assembly; the rocker arm assembly comprises a rocker arm body and a rocker arm shaft. A plunger mounting hole, a ball pin seat mounting hole, a check valve mounting hole and a check valve oil supply way are formed in the rocker arm body, the plunger mounting hole and the check valve mounting hole are located in the side, close to an engine cam shaft, of the rocker arm body, and the ball pin seat mounting hole is located in the side, close to an engine valve, of the rocker arm body. The rocker arm shaft is provided with a first oil outlet channel communicated with the check valve oil supply path; the first end of the check valve assembly enables the check valve mounting hole to be in one-way communication with the check valve oil way; the second end of the check valve assembly communicates with the first end of the execution plunger assembly to form a high-pressure oil cavity, and the second end of the execution plunger assembly is used for being rotationally connected with a cam shaft. Executing clearance assembly of the plunger assembly and the plunger mounting hole; by adopting the valve driving mechanism, the valve clearance can be automatically adjusted.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a valve drive mechanism and an engine system. Background Art

[0002] When the engine is working, the valve will expand and elongate due to the increase in temperature. Usually, when the engine is assembled in a cold state, a certain gap is left in the valve and its drive mechanism to compensate for the expansion of the valve after heating. The traditional valve clearance structure will generate noise during the operation of the engine, and the valve clearance needs to be adjusted regularly due to wear during use.

[0003] In order to improve the noise caused by the valve clearance and reduce the subsequent maintenance of the valve clearance, a valve drive mechanism capable of automatically adjusting the valve clearance is urgently needed. Summary of the invention

[0004] Based on this, it is necessary to provide a valve drive mechanism and an engine system that can automatically adjust the valve clearance in order to solve the above technical problems.

[0005] In a first aspect, the present application provides a valve drive mechanism, comprising:

[0006] Rocker arm assembly, check valve assembly, actuator plunger assembly and ball pin seat assembly;

[0007] The rocker arm assembly includes a rocker arm body and a rocker arm shaft; a plunger mounting hole, a ball pin seat mounting hole, a check valve mounting hole and a check valve oil supply oil passage are arranged in the rocker arm body; the plunger mounting hole and the ball pin seat mounting hole are connected, the plunger mounting hole and the check valve mounting hole are located on the side of the rocker arm body close to the engine camshaft, and the ball pin seat mounting hole is located on the side of the rocker arm body close to the engine valve;

[0008] The rocker arm shaft is provided with a first oil outlet passage, wherein the first oil outlet passage is communicated with the oil supply passage of the check valve;

[0009] The check valve installation hole is used to install the check valve assembly, and the first end of the check valve assembly enables the check valve installation hole to be in one-way communication with the check valve oil circuit;

[0010] The second end of the check valve assembly is connected to the first end of the actuator plunger assembly to form a high-pressure oil chamber, and the second end of the actuator plunger assembly is used to be rotatably connected to the camshaft;

[0011] Perform clearance assembly between the plunger assembly and the plunger mounting hole;

[0012] The ball pin seat assembly is used to connect with the valve bridge.

[0013] In one embodiment, the check valve assembly includes a metal ball, a first spring and a valve seat; wherein,

[0014] A first spring is disposed between the metal ball and the valve seat;

[0015] In the initial state of the valve drive mechanism, the metal ball contacts the first end of the check valve mounting hole;

[0016] The valve seat is interference fitted with the second end of the check valve mounting hole.

[0017] In one embodiment, the inner surface of the first end of the check valve mounting hole is an inclined surface;

[0018] The metal ball contacts the inclined plane.

[0019] In one embodiment, the actuator plunger assembly includes an actuator plunger and a second spring; wherein,

[0020] a second spring disposed between the second end of the check valve assembly and the first end of the actuator plunger;

[0021] The second end of the actuator plunger contacts the cam shaft.

[0022] In one of the embodiments, a snap ring groove is provided at the bottom of the plunger mounting hole, and the actuator plunger assembly includes a snap ring;

[0023] The execution plunger comprises a first plunger section, a second plunger section and a third plunger section, wherein the diameter of the second plunger section is smaller than the diameter of the third plunger section and smaller than the diameter of the first plunger section, and the first plunger section is clearance-matched with the plunger mounting hole;

[0024] The snap ring groove corresponds to the second plunger section, and the snap ring is arranged in the snap ring groove.

[0025] In one embodiment, the surface of the actuator plunger in contact with the cam shaft is a spherical surface, and the radius corresponding to the spherical surface is greater than the preset radius;

[0026] There is an offset between the spherical surface and the camshaft's peach position.

[0027] In one embodiment, the ball and pin seat assembly includes a ball pin and a pin seat, wherein the pin seat rotates around the ball pin within a preset angle range, and the pin seat is interference fitted with the pin seat mounting hole.

[0028] In one of the embodiments, a ball pin seat oil supply passage is also provided in the rocker arm body, and a second oil outlet passage is provided on the rocker arm shaft;

[0029] Wherein, the ball pin seat oil supply passage is communicated with the ball pin seat mounting hole.

[0030] In one of the embodiments, when the swing amplitude of the rocker arm body is greater than a preset amplitude, the second oil outlet channel is connected to the oil supply passage of the ball pin seat.

[0031] In a second aspect, the present application also provides an engine system, comprising the valve drive mechanism provided in the first aspect above.

[0032] The above-mentioned valve drive mechanism and engine system, wherein the valve drive mechanism includes a rocker arm assembly, a check valve assembly, an actuator plunger assembly and a ball pin seat assembly; wherein the rocker arm assembly includes a rocker arm body and a rocker arm shaft; a plunger mounting hole, a ball pin seat mounting hole, a check valve mounting hole and a check valve oil supply oil circuit are provided in the rocker arm body; the plunger mounting hole and the ball pin seat mounting hole are connected, the plunger mounting hole and the check valve mounting hole are located on the side of the rocker arm body close to the engine camshaft, and the ball pin seat mounting hole is located on the side of the rocker arm body close to the engine valve; the rocker arm shaft is provided with a first oil outlet channel, wherein the first oil outlet channel is connected to the check valve oil supply oil circuit; the check valve mounting hole is used to install the check valve assembly, and the first end of the check valve assembly makes the check valve mounting hole and the check valve oil circuit unidirectionally connected; the second end of the check valve assembly and the first end of the actuator plunger assembly are connected A high-pressure oil chamber is formed, and the second end of the actuator plunger assembly is used to be rotatably connected to the camshaft; the actuator plunger assembly is gap-assembled with the plunger mounting hole; the ball pin seat assembly is used to connect with the valve bridge; in this way, after the valve drive mechanism provided above is installed in the engine, the check valve assembly enables the check valve mounting hole to be unidirectionally connected to the check valve oil circuit, so that the lubricating oil can flow out from the first oil outlet channel set in the rocker arm shaft, and flow to the area connected between the check valve assembly and the actuator plunger assembly through the check valve oil supply circuit. The check valve assembly realizes unidirectional flow of lubricating oil, and forms a high-pressure oil chamber between the check valve assembly and the actuator plunger assembly; when the camshaft rotates, the actuator plunger assembly is squeezed and then the lubricating oil in the high-pressure oil chamber is squeezed. Due to the incompressibility of the lubricating oil, the load and movement can be transmitted without gaps between the components in the valve drive mechanism. As the engine is running, the valve temperature rises and expands. Based on the gap between the actuator plunger assembly and the plunger mounting hole, the lubricating oil in the high-pressure oil chamber is slowly discharged from the gap to compensate for the valve elongation. At the same time, in each working cycle of the engine, when the camshaft has no lift, the lubricating oil can flow to the check valve assembly through the check valve oil supply line to replenish the small amount of lubricating oil leaked from the high-pressure oil chamber, ensuring that the valve drive mechanism operates without gaps in its working state, thereby achieving the effect of automatically adjusting the valve clearance, improving engine noise and reducing the subsequent maintenance of the valve clearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 is a schematic structural diagram of a valve drive mechanism provided in one embodiment;

[0035] Figure 2 It is a schematic structural diagram of a rocker arm body in one embodiment;

[0036] Figure 3 It is a schematic diagram of the position relationship of some structures of the rocker arm assembly when the rocker arm body is not swinging in one embodiment;

[0037] Figure 4 A schematic diagram of a portion of the structure of an engine to which a valve drive mechanism is applied in one embodiment;

[0038] Figure 5 A schematic diagram of the structure of a check valve assembly in one embodiment;

[0039] Figure 6 A schematic diagram of a structure of a plunger assembly in one embodiment;

[0040] Figure 7 A schematic diagram of the structure of a ball and pin seat assembly in one embodiment;

[0041] Figure 8 The diagram is a partial structural position relationship diagram of a rocker arm assembly when the swing amplitude of the rocker arm body is greater than a preset amplitude in one embodiment.

[0042] Description of reference numerals:

[0043] 1. Rocker arm body; 11. Plunger mounting hole; 111. Retaining ring groove; 12. Ball pin seat mounting hole; 13. Check valve mounting hole; 14. Check valve oil supply circuit; 15. Ball pin seat oil supply circuit; 2. Check valve assembly; 21. Metal ball; 22. First spring; 23. Valve base; 3. Actuator plunger assembly; 31. Actuator plunger; 311. Spherical surface; 32. Second spring; 33. Retaining ring; 4. Ball pin seat assembly; 41. Ball pin; 42. Pin seat; 5. Rocker arm shaft; 51. First oil outlet channel; 52. Second oil outlet channel. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0046] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first spring may be referred to as a second spring, and similarly, a second spring may be referred to as a first spring without departing from the scope of this application. Both the first spring and the second spring are springs, but they are not the same spring.

[0047] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0048] It is understood that the term "based on" used in this application is used to describe one or more factors that affect the determination, and does not exclude other factors that may affect the determination. For example, the phrase "determine A based on B" means that the determination of A can be based entirely or at least partially on factor B, that is, B is a factor that affects the determination of A, but does not exclude that the determination of A is also based on C.

[0049] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0050] Please refer to Figure 1 , is a schematic diagram of the structure of a valve drive mechanism provided by an embodiment of the present application. Figure 1 As shown, the valve drive mechanism provided by this embodiment includes a rocker arm assembly, a ball pin seat assembly 2, an actuator plunger assembly 3 and a check valve assembly 4.

[0051] The rocker arm assembly includes a rocker arm body 1 and a rocker arm shaft 5. Figure 2 A plunger mounting hole 11, a ball pin seat mounting hole 12, a check valve mounting hole 13 and a check valve oil supply passage 14 are provided in the rocker arm body 1. The plunger mounting hole 11 is connected to the ball pin seat mounting hole 12. The plunger mounting hole 11 and the check valve mounting hole 13 are located on the side of the rocker arm body 1 close to the engine camshaft 6, and the ball pin seat mounting hole 12 is located on the side of the rocker arm body 1 close to the engine valve.

[0052] Please refer to Figure 3The rocker arm shaft 5 is provided with a first oil outlet channel 51, wherein the first oil outlet channel 51 is connected to the check valve oil supply circuit 14; the check valve mounting hole 13 is used to install the check valve assembly 4, and the first end of the check valve assembly 4 enables the check valve mounting hole 13 to be connected to the check valve oil supply circuit 14 in one-way.

[0053] The second end of the check valve assembly 4 and the first end of the actuator plunger assembly are connected to form a high-pressure oil chamber. The second end of the actuator plunger assembly 3 is used for rotatably connecting with the camshaft 6.

[0054] The plunger assembly 3 is assembled with a gap between the plunger mounting hole 11. The difference between the outer diameter of the plunger assembly 3 and the inner diameter of the plunger mounting hole 11 is less than a preset difference. Exemplarily, the preset difference ranges from 0.01 mm to 0.02 mm; that is, the plunger assembly 3 and the plunger mounting hole 11 are assembled with a small gap, so that the high-pressure oil chamber slowly unloads oil from the gap, and the position of the plunger assembly 3 changes slowly, compensating for the elongation of the valve expansion as the engine operating temperature rises.

[0055] The ball pin seat assembly 4 is used to connect with the valve bridge 7. Among them, one valve bridge 7 presses two valves. The valve drive mechanism converts the rotational motion of the camshaft 6 into the opening and closing motion of the valve by executing the contact between the plunger assembly 3 and the camshaft 6 and the connection between the ball pin seat assembly 4 and the valve bridge 7.

[0056] After the valve drive mechanism provided by this embodiment is installed in the engine, the check valve assembly 2 enables the check valve mounting hole 13 to be unidirectionally connected with the check valve oil circuit 14, so that the lubricating oil can flow out from the first oil outlet channel 51 set in the rocker arm shaft 5, and flow to the area connected between the check valve assembly 4 and the actuator plunger assembly 3 through the check valve oil supply circuit 14. The check valve assembly 4 realizes unidirectional flow of lubricating oil, and forms a high-pressure oil chamber between the check valve assembly 4 and the actuator plunger assembly 3; when the camshaft 6 rotates, it squeezes the actuator plunger assembly 3 and then squeezes the lubricating oil in the high-pressure oil chamber. Due to the incompressibility of the lubricating oil, the load and movement can be transmitted without any gap between the components in the valve drive mechanism. As the engine works, the valve temperature rises and expands. Based on the gap between the plunger assembly 3 and the plunger mounting hole 11, the lubricating oil in the high-pressure oil chamber is slowly discharged from the gap to compensate for the valve elongation. At the same time, in each working cycle of the engine, when the camshaft 6 has no lift, the lubricating oil can flow to the check valve assembly 2 through the check valve oil supply oil passage 14 to supplement the small amount of lubricating oil leaked from the high-pressure oil chamber, ensuring that the valve drive mechanism operates without gaps in the working state, and achieving the effect of automatically adjusting the valve clearance. During operation, the engine system relies on the valve drive mechanism provided in this embodiment to compensate for the valve clearance, improve engine noise and reduce the maintenance of the valve clearance in the later stage. Exemplarily, the lubricating oil can be engine oil.

[0057] For further information, please refer to Figure 4 , is a structural diagram of the engine cylinder position in the related art. Figure 2 It can be seen that the injector 8 is located at the center of the cylinder. Due to the space limitation of the cylinder diameter, the arrangement space on the valve side is very compact. The distance between the ball pin seat part of the rocker arm and the injector is relatively small, generally 2mm to 5mm. In this embodiment, the actuator plunger assembly 3 and the check valve assembly 2 are both arranged on the side of the rocker arm body 1 close to the engine camshaft 6, rather than on the side of the ball pin seat part, so as to avoid the related technology that the part of the assembly for realizing automatic adjustment of the valve clearance is arranged on the ball pin seat part, so that the position interference with the injector 8 occurs, resulting in poor stability of the engine operation. In this embodiment, the check valve assembly 2 and the plunger assembly 3 in the valve drive mechanism are arranged on the side close to the camshaft, so as to improve the stability of the engine operation. At the same time, the valve drive mechanism provided in this embodiment has a small number of overall components, which reduces the hardware cost of the engine system.

[0058] In the technical field, a valve drive mechanism capable of automatically adjusting the valve clearance may be referred to as a system capable of achieving an engine without adjusting the valve clearance.

[0059] In an exemplary embodiment, please refer to Figure 5 The check valve assembly 2 includes a metal ball 21, a first spring 22 and a valve seat 23. Exemplarily, the material of the metal ball 21 can be stainless steel, carbon steel, chrome steel, titanium alloy or tungsten alloy, and the metal ball 21 can also have a ceramic coating.

[0060] The first spring 22 is disposed between the metal ball 21 and the valve seat 23. Exemplarily, the first end of the first spring 22 is fixedly connected to the metal ball 21, and the second end of the first spring 22 is fixedly connected to the valve seat 23. Another exemplary embodiment, the first end of the first spring 22 abuts against the metal ball 21, and the second end of the first spring 22 abuts against the valve seat 23.

[0061] In the initial state of the valve drive mechanism, the metal ball 21 contacts the first end of the check valve mounting hole 13 .

[0062] The first spring 22 is in a compressed state, wherein in the initial state, the length of the first spring 22 is relatively the longest, and the first spring 22 provides an axial outward force along the first spring to push the metal ball 21 to contact the first end of the check valve mounting hole 13; when the engine is working, the lubricating oil flowing from the check valve oil supply passage 14 to the check valve assembly 2 squeezes the metal ball 21 away, and the lubricating oil flows into the area connected between the check valve assembly 2 and the actuator plunger assembly 3 until the area is filled with the lubricating oil to form a high-pressure oil chamber, and the metal ball 21 is lifted up by the lubricating oil and abuts against the first end of the check valve mounting hole 13 to form a one-way flow path to prevent the lubricating oil from flowing back to the check valve oil supply passage 14.

[0063] The valve base 23 is interference-fitted with the second end of the check valve mounting hole 13. A through hole is provided in the middle of the valve base 23, so that after the check valve assembly 2 is installed, the check valve mounting hole 13 can form a communicating area with the first end of the actuator plunger assembly 3 to form a high-pressure oil chamber.

[0064] In a possible implementation, the inner surface of the first end of the check valve mounting hole 13 is an inclined surface, and the metal ball abuts against the inclined surface. Exemplarily, the first end of the check valve mounting hole 13 is in a cone shape. In this way, the first inner surface of the check valve mounting hole 13 is set as an inclined surface, so that when the metal ball 21 contacts the first end of the check valve mounting hole 13, it plays a better sealing role, thereby improving the reliability of the check valve assembly 2.

[0065] In an exemplary embodiment, please refer to Figure 6 The actuator plunger assembly includes an actuator plunger 31 and a second spring 32 , wherein the second spring 32 is disposed between the second end of the check valve assembly 2 and the first end of the actuator plunger 31 .

[0066] The second spring 32 is in a compressed state, wherein in the initial state, the length of the second spring 32 is relatively the longest, and the second spring 32 provides an axial outward force along the second spring 32 to push the actuator rod away from the check valve assembly.

[0067] For example, please refer to Figure 5 The first end of the actuator plunger 31 is provided with a groove, and the second spring 32 is partially arranged in the groove. In this way, the groove provides a positioning guide for the second spring 32.

[0068] The second end of the actuator plunger 31 contacts the camshaft 6. In one possible embodiment, the side of the actuator plunger 31 that contacts the camshaft 6 is a spherical surface 311. There is a deviation between the position of the spherical surface 311 and the peach piece of the camshaft 6. In this way, the actuator plunger 31 can rotate around itself during operation, which is beneficial to reduce wear and improve the reliability of the valve drive mechanism. The radius corresponding to the spherical surface 311 is greater than the preset radius. Exemplarily, the radius corresponding to the spherical surface 311 can be determined according to the size of the actuator plunger, the load distribution of the contact surface, and the relative movement of the camshaft 6 and the actuator plunger when in contact.

[0069] In an exemplary embodiment, please combine Figure 2 and Figure 6 , a snap ring groove 111 is provided at the bottom of the plunger mounting hole 11, and the actuator plunger assembly 3 includes a snap ring 33. The bottom of the plunger mounting hole 11 refers to the end of the plunger mounting hole 11 close to the camshaft 6. The actuator plunger 11 includes a first plunger section, a second plunger section and a third plunger section, wherein the diameter of the second plunger section is smaller than the diameter of the third plunger section and smaller than the diameter of the first plunger section, and the first plunger section is clearance-matched with the plunger mounting hole 11; the snap ring groove 111 corresponds to the second plunger section, and the snap ring 33 is provided in the snap ring groove 111. In the initial state, the actuator plunger 31 is located at the maximum extension position under the action of the second spring 32, and is limited by the snap ring 33.

[0070] Combination Figure 6 The first plunger segment executes the groove set in the plunger 31, and the third plunger segment contacts the camshaft 6.

[0071] In an exemplary embodiment, please refer to Figure 7 The ball pin seat assembly 4 includes a ball pin 41 and a pin seat 42, wherein the pin seat 42 rotates around the ball pin 41 within a preset angle range, and the pin seat 42 is interference fitted with the mounting hole of the pin seat 42.

[0072] In one possible implementation, please refer to Figure 3 A ball pin seat oil supply passage 15 is also provided in the rocker arm body 1, and a second oil outlet channel 52 is provided in the rocker arm shaft 5; wherein, the ball pin seat oil supply passage 15 is communicated with the ball pin seat mounting hole 12; thus, after the components of the engine system are fully assembled, during the operation of the engine, the lubricating oil flows to the ball pin seat mounting hole 12 through the ball pin seat oil supply passage 15, thereby providing lubrication for the ball pin seat assembly 4 and reducing the wear inside the ball pin seat assembly 4.

[0073] In an exemplary embodiment, Figure 3 Schematic diagram of the relative position relationship between the first oil outlet channel 51 and the check valve oil supply channel 14 and the relative position relationship between the second oil outlet channel 52 and the ball pin seat oil supply channel 15 when the rocker arm body 1 is not swinging; please refer to Figure 8 , is a schematic diagram of the relative position relationship between the first oil outlet channel 51 and the check valve oil supply channel 14, and the relative position relationship between the second oil outlet channel 52 and the ball pin seat oil supply channel 15 when the swing amplitude of the rocker arm body 1 is greater than the preset amplitude. Figure 3 and Figure 8 When the swing amplitude of the rocker arm body 1 is greater than the preset amplitude, the second oil outlet channel 52 is connected with the ball pin seat oil supply passage 15.

[0074] For example, the preset amplitude is slightly smaller than the maximum amplitude of the swing of the rocker arm body 1. Figure 3 and Figure 8 When the swing amplitude of the rocker arm body 1 is less than or equal to the preset amplitude, the second oil outlet passage 52 is not connected to the ball pin seat oil supply passage 15. In this way, when the swing amplitude of the rocker arm body 1 is near the maximum amplitude, the second oil outlet passage 52 is connected to the ball pin seat oil supply passage 15 to provide lubricating oil for the ball pin seat assembly 4, and the amount of lubricating oil discharged can be reduced on the basis of improving the lubrication condition of the ball pin seat assembly 4.

[0075] Among them, combined Figure 3 and Figure 8 In the embodiment of the present application, the first oil outlet channel 51 and the check valve oil supply channel 14 are continuously connected regardless of the swing position of the swing arm body 1.

[0076] In an exemplary embodiment, an engine system is provided, wherein the engine system includes the valve drive mechanism provided by the above embodiment.

[0077] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A valve drive mechanism, characterized in that: The valve drive mechanism comprises: a rocker arm assembly, a check valve assembly, an actuator plunger assembly and a ball pin seat assembly; Wherein, the rocker arm assembly comprises a rocker arm body and a rocker arm shaft; a plunger mounting hole, a ball pin seat mounting hole, a check valve mounting hole and a check valve oil supply passage are arranged in the rocker arm body; the plunger mounting hole is communicated with the ball pin seat mounting hole, the plunger mounting hole and the check valve mounting hole are located on a side of the rocker arm body close to the engine camshaft, and the ball pin seat mounting hole is located on a side of the rocker arm body close to the engine valve; The rocker arm shaft is provided with a first oil outlet passage, wherein the first oil outlet passage is communicated with the oil supply passage of the check valve; The check valve installation hole is used to install the check valve assembly, and the first end of the check valve assembly enables the check valve installation hole to be in one-way communication with the check valve oil circuit; The second end of the check valve assembly is connected to the first end of the actuator plunger assembly to form a high-pressure oil chamber, and the second end of the actuator plunger assembly is used to be rotatably connected to the camshaft; The actuator plunger assembly is gap-assembled with the plunger mounting hole; The ball pin seat assembly is used for connecting with the valve bridge.

2. The valve drive mechanism according to claim 1, characterized in that: The check valve assembly includes a metal ball, a first spring and a valve seat; wherein, The first spring is arranged between the metal ball and the valve seat; In the initial state of the valve drive mechanism, the metal ball contacts the first end of the check valve mounting hole; The valve seat is interference fitted with the second end of the check valve mounting hole.

3. The valve drive mechanism according to claim 2, characterized in that: The inner surface of the first end of the check valve installation hole is an inclined surface; The metal ball contacts the inclined surface.

4. The valve drive mechanism according to claim 1, characterized in that: The actuator plunger assembly includes an actuator plunger and a second spring; wherein, The second spring is disposed between the second end of the check valve assembly and the first end of the actuator plunger; The second end of the actuator plunger contacts the cam shaft.

5. The valve drive mechanism according to claim 4, characterized in that: A snap ring groove is provided at the bottom of the plunger mounting hole, and the actuator plunger assembly includes a snap ring; The actuator plunger comprises a first plunger section, a second plunger section and a third plunger section, wherein the diameter of the second plunger section is smaller than the diameter of the third plunger section and smaller than the diameter of the first plunger section, and the first plunger section is clearance-matched with the plunger mounting hole; The snap ring groove corresponds to the second plunger section, and the snap ring is arranged in the snap ring groove.

6. The valve drive mechanism according to claim 4, characterized in that: The surface of the actuator plunger in contact with the camshaft is a spherical surface, and the radius corresponding to the spherical surface is greater than the preset radius; The spherical surface is offset from the position of the camshaft's peach.

7. The valve drive mechanism according to claim 1, characterized in that: The ball and pin seat assembly comprises a ball pin and a pin seat, wherein the pin seat rotates around the ball pin within a preset angle range, and the pin seat is interference fitted with the pin seat mounting hole.

8. The valve drive mechanism according to claim 1, characterized in that: The rocker arm body is also provided with a ball pin seat oil supply passage, and the rocker arm shaft is provided with a second oil outlet passage; Wherein, the ball pin seat oil supply passage is communicated with the ball pin seat mounting hole.

9. The valve drive mechanism according to claim 8, characterized in that: When the swing amplitude of the rocker arm body is greater than a preset amplitude, the second oil outlet channel is communicated with the ball pin seat oil supply passage.

10. An engine system, characterized in that: The engine system comprises the valve drive mechanism according to any one of claims 1-9.

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