Variable valve actuation system and engine

Abstract

The present invention discloses a variable valve actuation system and an engine. In this variable valve actuation system, the input end of a first oil circuit is connected to a hydraulic chamber via an oil delivery circuit. The first output end of the first oil circuit is connected to the connection between the first axle and the first roller. The second output end of the first oil circuit extends through the end face of the first axle near the second axle, and the input end of the second oil circuit extends through the end face of the second axle near the first axle. When the second roller is in the working position, the second output end of the first oil circuit is in collinear communication with the input end of the second oil circuit. When the second roller is in the standby position, the second output end of the first oil circuit is spaced apart from the input end of the second oil circuit along a directional axis. The output end of the second oil circuit is connected to the connection between the second axle and the second roller. The connection between the first roller and the first axle is always lubricated, and when the second roller is in the working position, the connection between the second roller and the second axle is lubricated, thereby improving the smoothness and stability of valve opening and closing.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a variable valve drive system and an engine. Background Art

[0002] The valve actuation system is a key component of an engine, driving the opening and closing of the intake and exhaust valves to deliver air and exhaust gases into the engine. With increasingly stringent requirements for reducing fuel consumption and emissions, variable valve actuation systems are being widely researched and applied.

[0003] A variable valve actuation system in the prior art comprises a rocker arm, a roller structure disposed at one end of the rocker arm, an elephant foot disposed at the other end of the rocker arm, and a cam structure. The roller structure includes a first roller fixedly disposed at one end of the rocker arm and a second roller movable at the same end of the rocker arm. The cam structure includes two cams with different profiles. The first roller and the second roller are disposed in a one-to-one correspondence with the two cams, and the two cams are respectively used to drive the first roller and the second roller to move. This allows both cams to push the rocker arm to rotate about a fixed axis, driving the elephant foot to open and close the valve. The valve lift corresponding to the two cams is different, thereby achieving different intake volumes. However, the prior art lacks a lubrication structure suitable for this variable valve actuation system, and the smoothness and stability of valve opening and closing need to be improved. Summary of the Invention

[0004] The purpose of the present invention is to provide a variable valve drive system and an engine to solve the problem in the prior art that there is no lubrication structure suitable for the above-mentioned variable valve drive system, and the smoothness and stability of valve opening and closing need to be improved.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A variable valve actuation system includes a rocker arm body, a first roller structure, a second roller structure, and a switching assembly; the first end of the rocker arm body is used to drive valve opening and closing; the first roller structure includes a first axle connected to the second end of the rocker arm body, and a first roller rotatably mounted on the first axle; the second roller structure includes a second axle and a second roller rotatably mounted on the second axle; the switching assembly can drive the second roller to move in a directional manner, with the second roller having an operating position and a standby position;

[0007] The second end of the rocker arm body is provided with a hydraulic chamber;

[0008] The rocker arm body is provided with a delivery oil circuit, the first axle is provided with a first oil circuit, and the second axle is provided with a second oil circuit; the input end of the first oil circuit is connected to the hydraulic chamber through the delivery oil circuit, the first output end of the first oil circuit is connected to the connection between the first axle and the first roller, the second output end of the first oil circuit passes through the end face of the first axle close to the second axle, and the input end of the second oil circuit passes through the end face of the second axle close to the first axle; when the second roller is in the working position, the second output end of the first oil circuit is connected to the input end of the second oil circuit in a collinear manner; when the second roller is in the waiting position, the second output end of the first oil circuit and the input end of the second oil circuit are distributed along the directional interval; the output end of the second oil circuit is connected to the connection between the second axle and the second roller.

[0009] As a preferred solution of the above variable valve drive system, along the axial direction of the first axle, the distance between the second output end of the first oil circuit and the input end of the second oil circuit ranges from 0.05 mm to 0.1 mm.

[0010] As a preferred solution of the above-mentioned variable valve drive system, a hollow pin is fixedly provided at the second output end of the first oil circuit, and the spray hole of the hollow pin is connected to the second output end of the first oil circuit. The spray hole can be connected in line with the input end of the second oil circuit or distributed along the directional interval.

[0011] As a preferred solution of the above variable valve actuation system, the aperture of the spray hole is smaller than the aperture of the second output end of the first oil circuit; and / or,

[0012] The diameter of the spray hole is smaller than the diameter of the input end of the second oil circuit.

[0013] As a preferred solution of the above-mentioned variable valve drive system, the end of the spray hole close to the second oil circuit is tapered, and the large end of the tapered hole is closer to the second oil circuit than the small end of the tapered hole.

[0014] As a preferred solution of the above-mentioned variable valve drive system, the first oil circuit includes a first sub-oil circuit and a second sub-oil circuit; the input end of the first sub-oil circuit is connected to the output end of the delivery oil circuit, and the output end of the first sub-oil circuit is connected to the connection between the first wheel axle and the first roller; the input end of the second sub-oil circuit is connected to the first sub-oil circuit, at least the output end of the second sub-oil circuit is parallel to the axial direction of the first wheel axle, and the output end of the second sub-oil circuit can be connected to the input end of the second oil circuit in a collinear manner or distributed along the directional interval.

[0015] As a preferred solution of the above-mentioned variable valve drive system, a first oil groove is recessed in the outer circumferential wall of the first wheel axle and / or the inner circumferential wall of the first roller, and the first output end of the first oil circuit is connected to the first oil groove.

[0016] As a preferred solution of the above-mentioned variable valve drive system, a second oil groove is recessed in the outer circumferential wall of the second wheel shaft and / or the inner circumferential wall of the second roller, and the output end of the second oil circuit is connected to the second oil groove.

[0017] As a preferred solution of the above-mentioned variable valve drive system, the rocker arm body is further provided with an oil inlet and an oil unloading port communicated with the hydraulic chamber.

[0018] An engine including the variable valve actuation system described above.

[0019] Beneficial effects of the present invention:

[0020] The present invention provides a variable valve actuation system and an engine. The variable valve actuation system includes a rocker arm body, a first roller structure, a second roller structure, and a switching assembly. The first end of the rocker arm body is used to drive the opening and closing of the valve. The first roller structure includes a first axle connected to the second end of the rocker arm body and a first roller rotatably mounted on the first axle. The second roller structure includes a second axle and a second roller rotatably mounted on the second axle. The switching assembly can drive the second roller to move in a directional manner, with the second roller having a working position and a standby position. The second end of the rocker arm body is provided with a hydraulic chamber. The rocker arm body is provided with an oil supply circuit, the first axle is provided with the first oil supply circuit, and the second axle is provided with the second oil supply circuit. The input end of the first oil supply circuit communicates with the hydraulic chamber through the oil supply circuit. The first output end of the first oil supply circuit communicates with the connection between the first axle and the first roller. The second output end of the first oil supply circuit extends through the end face of the first axle near the second axle. The input end of the second oil supply circuit extends through the end face of the second axle near the first axle. When the second roller is in the operating position, the second output end of the first oil circuit is in collinear communication with the input end of the second oil circuit. When the second roller is in the standby position, the second output end of the first oil circuit and the input end of the second oil circuit are spaced apart in a directional pattern. The output end of the second oil circuit is connected to the junction of the second axle and the second roller.

[0021] This variable valve actuation system effectively lubricates the connection between the second roller and the second axle when the second roller is in the working position, effectively improving the working performance of the second roller and the service life of the second roller and the second axle. Furthermore, it always lubricates the connection between the first roller and the first axle, effectively improving the working performance of the first roller and the service life of the first roller and the first axle. This effectively enhances the smoothness and stability of valve opening and closing.

[0022] The present invention also provides an engine including the variable valve drive system. By adopting the variable valve drive system, the smoothness and stability of valve opening and closing can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a variable valve drive system provided by a specific embodiment of the present invention;

[0024] Figure 2 is a cross-sectional view of a second roller provided by a specific embodiment of the present invention when it is in a working position;

[0025] Figure 3 It is a cross-sectional view of the second roller provided by a specific embodiment of the present invention when it is in the working position.

[0026] In the picture:

[0027] 1. Rocker arm body; 11. Hydraulic chamber; 12. Oil delivery line; 13. Oil inlet;

[0028] 2. First roller structure; 21. First axle; 211. First oil circuit; 2111. First sub-oil circuit; 2112. Second sub-oil circuit; 212. First oil tank; 22. First roller;

[0029] 3. Second roller structure; 31. Second axle; 311. Second oil circuit; 3111. Third sub-oil circuit; 3112. Fourth sub-oil circuit; 312. Second oil tank; 32. Second roller;

[0030] 41. Piston; 42. Elastic member; 43. Connecting seat; 431. Limit block;

[0031] 5. Hollow pin; 51. Spray hole;

[0032] 61. Elephant foot; 62. Locking nut. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0034] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0037] A variable valve actuation system in the prior art comprises a rocker arm, a roller structure disposed at one end of the rocker arm, an elephant foot disposed at the other end of the rocker arm, and a cam structure. The roller structure includes a first roller fixedly disposed at one end of the rocker arm and a second roller movable at the same end of the rocker arm. The cam structure includes two cams with different profiles. The first roller and the second roller are disposed in a one-to-one correspondence with the two cams, and the two cams are respectively used to drive the first roller and the second roller to move. This allows both cams to push the rocker arm to rotate about a fixed axis, driving the elephant foot to open and close the valve. The valve lift corresponding to the two cams is different, thereby achieving different intake volumes. However, the prior art lacks a lubrication structure suitable for this variable valve actuation system, and the smoothness and stability of valve opening and closing need to be improved.

[0038] like Figure 1-3As shown, the present invention provides a variable valve drive system, which includes a rocker arm body 1, a first roller structure 2, a second roller structure 3, and a switching assembly. The first end of the rocker arm body 1 is used to drive the opening and closing of the valve. The first roller structure 2 includes a first axle 21 connected to the second end of the rocker arm body 1, and a first roller 22 rotatably mounted on the first axle 21. The second roller structure 3 includes a second axle 31 and a second roller 32 rotatably mounted on the second axle 31. The switching assembly includes a piston 41 and an elastic member 42. The switching assembly can drive the second roller 32 to move in a directional manner and have a working position and a standby position.

[0039] Specifically, if Figure 1-3 As shown, the second end of the rocker arm body 1 is provided with a hydraulic chamber 11. The switching assembly includes a piston 41 and an elastic member 42. One end of the piston 41 is slidably disposed in the hydraulic chamber 11, while the other end of the piston 41 is connected to the second axle 31. The piston 41 can drive the second roller 32 to move in a directional manner to an operating position; the elastic restoring force of the elastic member 42 can drive the second roller 32 to move in a directional manner to a standby position. The variable valve actuation system also includes a first cam and a second cam whose rotational centerlines are collinear. The first cam has a different profile than the second cam, which is a curve representing the correspondence between cam angle and valve lift. When the second roller 32 is in the operating position, the second cam contacts the second roller 32, while the first cam does not contact the first roller 22. When the second roller 32 is in the standby position, the second cam does not contact the second roller 32, while the first cam contacts the first roller 22. The rocker arm body 1 is rotatably mounted on the rocker arm shaft.

[0040] When the second roller 32 is to be moved to the working position, hydraulic oil is pumped into the hydraulic chamber 11 to apply pressure to the piston 41, allowing the piston 41 to drive the second roller 32 to move in a directional direction to the working position. During this process, the elastic member 42 is elastically deformed by the force applied thereto. After the second roller 32 moves in a directional direction to the working position, the pressure of the hydraulic oil in the hydraulic chamber 11 is maintained to keep the second roller 32 in the working position. When the second roller 32 is in the working position, the second cam contacts the second roller 32. The rotation of the second cam drives the rocker body 1 to rotate relative to the rocker shaft, thereby driving the first end of the rocker body 1 to open and close the valve. To change the valve lift, the hydraulic oil in the hydraulic chamber 11 is depressurized. The elastic restoring force of the elastic member 42 drives the second roller 32 to move from the working position to the standby position in a directional manner, so that the second cam and the second roller 32 are not in contact, and the first cam is in contact with the first roller 22. The rotation of the first cam drives the rocker body 1 to rotate relative to the rocker shaft, thereby also driving the first end of the rocker body 1 to open and close the valve. Because the profiles of the first cam and the second cam are different, two different valve lifts can be obtained.

[0041] Specifically, in this embodiment, the elastic member 42 is a spring sheet. One end of the elastic member 42 is fixedly connected to the second end of the rocker arm body 1, and the other end is connected to or abuts against the end of the piston 41 extending from the hydraulic chamber 11. In this way, the elastic member 42 can be elastically deformed during the process of the second roller 32 moving from the waiting position to the working position along the direction. And the elastic restoring force of the elastic member 42 can drive the second roller 32 to move from the working position to the waiting position along the direction. Specifically, in this embodiment, Figure 1 As shown, there are two elastic members 42 , and the two elastic members 42 are respectively located on both sides of the second roller 32 .

[0042] Among them, such as Figure 1-3 As shown, the rocker arm body 1 is provided with an oil supply circuit 12, a first oil circuit 211 is provided on the first axle 21, and a second oil circuit 311 is provided on the second axle 31. The input end of the first oil circuit 211 communicates with the hydraulic chamber 11 through the oil supply circuit 12. The first output end of the first oil circuit 211 communicates with the connection between the first axle 21 and the first roller 22. The second output end of the first oil circuit 211 extends through the end surface of the first axle 21 near the second axle 31, and the input end of the second oil circuit 311 extends through the end surface of the second axle 31 near the first axle 21. When the second roller 32 is in the operating position, the second output end of the first oil circuit 211 and the input end of the second oil circuit 311 are collinearly connected. When the second roller 32 is in the standby position, the second output end of the first oil circuit 211 and the input end of the second oil circuit 311 are spaced apart in a directional pattern. The output end of the second oil circuit 311 connects to the connection between the second axle 31 and the second roller 32.

[0043] When the second roller 32 moves to the working position, the second output end of the first oil circuit 211 and the input end of the second oil circuit 311 are synchronously connected in a collinear manner. At this time, the hydraulic chamber 11, the input end of the first oil circuit 211, the second output end of the first oil circuit 211 and the second oil circuit 311 are connected in sequence, so that when the second roller 32 is in the working position, the connection between the second roller 32 and the second wheel axle 31 can be lubricated synchronously, which can effectively improve the working performance of the second roller 32 and the service life of the second roller 32 and the second wheel axle 31.

[0044] When the valve lift is to be changed, that is, when the second roller 32 is to be moved to the standby position, the hydraulic oil in the hydraulic chamber 11 is depressurized. The elastic restoring force of the elastic member 42 drives the second roller 32 to move in a directional direction from the working position to the standby position, thereby reducing the amount of hydraulic oil in the hydraulic chamber 11. Furthermore, the second output end of the first oil circuit 211 and the input end of the second oil circuit 311 are spaced apart in a directional direction, and no hydraulic oil is supplied to the second oil circuit 311. This also reduces the amount of hydraulic oil that leaks between the second output end of the first oil circuit 211 and the input end of the second oil circuit 311.

[0045] The hydraulic chamber 11, the input end of the first oil circuit 211, and the first output end of the first oil circuit 211 are always connected, so that the connection between the first roller 22 and the first axle 21 can always be lubricated. This effectively improves the working performance of the first roller 22 and the service life of the first roller 22 and the first axle 21.

[0046] Therefore, the variable valve actuation system can effectively lubricate the connection between the second roller 32 and the second axle 31 when the second roller 32 is in the working position, effectively improving the working performance of the second roller 32 and effectively increasing the service life of the second roller 32 and the second axle 31. Secondly, the connection between the first roller 22 and the first axle 21 can always be lubricated, effectively improving the working performance of the first roller 22 and effectively increasing the service life of the first roller 22 and the first axle 21. This can effectively improve the smoothness and stability of valve opening and closing.

[0047] It is understood that the hydraulic oil that drives the piston 41 in a directional movement, the hydraulic oil that lubricates the connection between the first roller 22 and the first axle 21, and the hydraulic oil that lubricates the connection between the second roller 32 and the second axle 31 share the same hydraulic chamber 11. This simplifies the structure of the rocker arm body 1 and reduces the processing cost, volume, and weight of the rocker arm body 1.

[0048] Specifically, in this embodiment, the first axle 21 is fixedly connected to the second end of the rocker arm body 1. As an alternative, the first axle 21 is rotatably connected to the second end of the rocker arm body 1, and the central axis of the first axle 21 and the rotation centerline of the first axle 21 are collinear.

[0049] Specifically, in this embodiment, Figure 1 As shown, the switching assembly further includes a connecting seat 43, one end of which is fixedly connected to the end of the piston 41 extending out of the hydraulic chamber 11, and the second axle 31 is fixedly connected to the connecting seat 43. As an alternative, one end of the connecting seat 43 is fixedly connected to the end of the piston 41 extending out of the hydraulic chamber 11, and the second axle 31 is rotatably connected to the connecting seat 43, and the central axis of the second axle 31 is collinear with the rotation centerline of the second axle 31. Further, in this embodiment, as Figure 1 As shown, the two elastic members 42 are both connected to or abut against the connecting seat 43 .

[0050] Specifically, if Figure 2 and Figure 3 As shown, the rocker arm body 1 is further provided with an oil inlet 13 and an oil discharge port which are communicated with the hydraulic chamber 11. Hydraulic oil is delivered to the hydraulic chamber 11 through the oil inlet 13. The hydraulic oil in the hydraulic chamber 11 is drained through the oil discharge port.

[0051] Preferably, along the axial direction of the first axle 21, the spacing between the second output end of the first oil circuit 211 and the input end of the second oil circuit 311 ranges from 0.05 mm to 0.1 mm. This minimizes leakage of hydraulic oil from the gap between the second output end of the first oil circuit 211 and the input end of the second oil circuit 311. It is understood that, along the axial direction of the first axle 21, the end surface of the second output end of the first oil circuit 211 is coplanar with the end surface of the first axle 21 near the second axle 31. The end surface of the input end of the second oil circuit 311 is coplanar with the end surface of the second axle 31 near the first axle 21. That is, along the axial direction of the first axle 21, the spacing between the first axle 21 and the second axle 31 ranges from 0.05 mm to 0.1 mm.

[0052] More preferably, Figure 2 and Figure 3 As shown, a hollow pin 5 is fixedly mounted at the second output end of the first oil circuit 211. The spray holes 51 of the hollow pin 5 are connected to the second output end of the first oil circuit 211. The spray holes 51 can be collinearly connected to the input end of the second oil circuit 311 or distributed along a directional interval. By installing the hollow pin 5 at the second output end of the first oil circuit 211, the aperture of the first oil circuit 211 and / or the aperture of the second oil circuit 311 can be appropriately increased, thereby facilitating the processing of the first oil circuit 211 and the second oil circuit 311. Furthermore, by installing the hollow pin 5 at the second output end of the first oil circuit 211, different hollow pins 5 can be adaptively replaced according to actual injection requirements. Different hollow pins 5 correspond to different apertures of the spray holes 51. Therefore, the injection force of the hydraulic oil injected into the input end of the second oil circuit 311 can be adjusted by adjusting the aperture of the spray holes 51.

[0053] Specifically, a slot is provided at the second output end of the first oil passage 211, into which the hollow pin 5 is inserted with interference fit. Preferably, along the axial direction of the first axle 21, the end face of the hollow pin 5 away from the input end of the first oil passage 211 is coplanar with the end face of the first axle 21 closer to the second axle 31.

[0054] More preferably, Figure 2 and Figure 3 As shown, the diameter of the spray hole 51 is smaller than the diameter of the second output end of the first oil circuit 211. This arrangement can reduce the pressure loss of the hydraulic oil. Secondly, when the second roller 32 is in the working position, the hydraulic oil sprayed from the spray hole 51 has a certain spray force, so that the hydraulic oil sprayed from the spray hole 51 can flow well into the second oil circuit 311, which can effectively improve the reliability of the hydraulic oil flowing into the second oil circuit 311.

[0055] More preferably, Figure 2 and Figure 3As shown, the diameter of the spray hole 51 is smaller than the diameter of the input end of the second oil circuit 311. With this arrangement, when the second roller 32 is in the working position, the hydraulic oil sprayed from the spray hole 51 can further flow into the second oil circuit 311 well.

[0056] Furthermore, the spray hole 51 is preferably tapered at one end thereof, which is closer to the second oil passage 311 than the smaller end thereof. This configuration reduces the risk of cavitation of the second axle 31 by hydraulic oil sprayed from the spray hole 51 when the second roller 32 is in the standby position.

[0057] Specifically, if Figure 2 and Figure 3 As shown, the first oil circuit 211 includes a first sub-circuit 2111 and a second sub-circuit 2112. The input end of the first sub-circuit 2111 is connected to the output end of the oil delivery circuit 12, and the output end of the first sub-circuit 2111 is connected to the connection between the first axle 21 and the first roller 22. The input end of the second sub-circuit 2112 is connected to the first sub-circuit 2111. At least the output end of the second sub-circuit 2112 is parallel to the axial direction of the first axle 21. The output end of the second sub-circuit 2112 can be collinear with the input end of the second oil circuit 311 or spaced apart along a directional axis. Specifically, a slot is provided at the output end of the second sub-circuit 2112, into which the hollow pin 5 is interference fit. This arrangement ensures that the hydraulic oil in the hydraulic chamber 11 can be delivered to both the connection between the first roller 22 and the first axle 21 and the connection between the second roller 32 and the second axle 31.

[0058] Specifically, in this embodiment, Figure 2 and Figure 3 As shown, the first sub-oil passage 2111 is tilted, and the first sub-oil passage 2111 and the second sub-oil passage 2112 are distributed at an angle, which can effectively shorten the path of the first sub-oil passage 2111, thereby improving lubrication efficiency.

[0059] Specifically, in this embodiment, Figure 2 As shown, the second oil circuit 311 includes a third sub-oil circuit 3111 and a fourth sub-oil circuit 3112, which are vertically connected. The output end of the second sub-oil circuit 3112 can be collinearly connected to the input end of the third sub-oil circuit 3111 or spaced apart along a directional axis. The output end of the fourth sub-oil circuit 3112 is connected to the junction of the second axle 31 and the second roller 32.

[0060] Specifically, in this embodiment, Figure 2 As shown, when the second roller 22 is in the working position, the central axis of the second sub-oil channel 2112 and the central axis of the first axle 21 are collinear, and the central axis of the third sub-oil channel 3111 and the central axis of the second axle 31 are also collinear.

[0061] Preferably, if Figure 2 and Figure 3 As shown, a first oil groove 212 is recessed in the outer circumferential wall of the first axle 21 and / or the inner circumferential wall of the first roller 22. The first output end of the first oil circuit 211 is connected to the first oil groove 212. Specifically, the output end of the first sub-oil circuit 2111 is connected to the first oil groove 212. The first oil groove 212 can store some hydraulic oil, thereby further improving the lubrication efficiency and reliability of the connection between the first axle 21 and the first roller 22.

[0062] More preferably, Figure 2 and Figure 3 As shown, the end surface area of ​​the output end of the first sub-oil channel 2111 is smaller than the opening area of ​​the first oil groove 212. The output end of the first sub-oil channel 2111 is located within the area where the opening of the first oil groove 212 is located. This further improves the lubrication effect and reliability of the connection between the first axle 21 and the first roller 22.

[0063] Preferably, if Figure 2 and Figure 3 As shown, a second oil groove 312 is recessed in the outer circumferential wall of the second axle 31 and / or the inner circumferential wall of the second roller 32. The output end of the second oil circuit 311 is connected to the second oil groove 312. Specifically, the output end of the fourth sub-oil circuit 3112 is connected to the second oil groove 312. The second oil groove 312 can store some hydraulic oil, thereby further improving the lubrication efficiency and reliability of the connection between the second axle 31 and the second roller 32.

[0064] More preferably, Figure 2 and Figure 3 As shown, the end surface area of ​​the output end of the fourth sub-oil channel 3112 is smaller than the opening area of ​​the second oil groove 312. The output end of the fourth sub-oil channel 3112 is located within the area where the opening of the second oil groove 312 is located. This further improves the lubrication efficiency and reliability of the connection between the second axle 31 and the second roller 32.

[0065] Alternatively, as Figure 1 As shown, one of the connecting seat 43 and the second end of the rocker arm body 1 is provided with a limit block 431, and the other is provided with a limit groove. When the second roller 32 is in the working position, the limit block 431 is inserted into the limit groove along the direction and abuts against the inner wall of the limit groove. This arrangement can prevent the second roller 32 from moving too much or too little along the direction when moving from the waiting position to the working position, thereby improving the reliability and accuracy of the cooperation between the second roller 32 and the second cam. In this embodiment, as shown in FIG. Figure 1As shown, the exemplary embodiment takes the connecting seat 43 as provided with a limit block 431 and the second end of the rocker arm body 1 as an example. As an alternative, the connecting seat 43 can also be provided with a limit groove and the second end of the rocker arm body 1 can be provided with a limit block 431.

[0066] Specifically, if Figure 1 As shown, the first end of the rocker arm body 1 is provided with an elephant foot 61. One end of the elephant foot 61 is threadedly connected to the rocker arm body 1, and a locking nut 62 is threadedly connected to the other end of the elephant foot 61. The other end of the elephant foot 61 is used to connect to the valve. After loosening the locking nut 62, the elephant foot 61 can be rotated to adjust its position; tightening the locking nut 62 locks the elephant foot 61 to the rocker arm body 1. This allows the setting position of the elephant foot 61 to be adjusted, and thus the setting position of the valve to be adjusted. The connection structure between the elephant foot 61 and the valve is prior art and will not be described in detail here.

[0067] The present invention also provides an engine including the variable valve drive system. By adopting the variable valve drive system, the smoothness and stability of valve opening and closing can be effectively improved.

[0068] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A variable valve drive system, comprising a rocker arm body (1), a first roller structure (2), a second roller structure (3) and a switching assembly; the first end of the rocker arm body (1) is used to drive the valve to open and close; the first roller structure (2) comprises a first axle (21) connected to the second end of the rocker arm body (1), and a first roller (22) rotatably mounted on the first axle (21); the second roller structure (3) comprises a second axle (31) and a second roller (32) rotatably mounted on the second axle (31); the switching assembly can drive the second roller (32) to move in a directional manner and have a working position and a waiting position; and the system is characterized in that: The second end of the rocker arm body (1) is provided with a hydraulic chamber (11); The rocker arm body (1) is provided with a delivery oil circuit (12), the first wheel shaft (21) is provided with a first oil circuit (211), and the second wheel shaft (31) is provided with a second oil circuit (311); the input end of the first oil circuit (211) is communicated with the hydraulic chamber (11) through the delivery oil circuit (12), the first output end of the first oil circuit (211) is communicated with the connection between the first wheel shaft (21) and the first roller (22), the second output end of the first oil circuit (211) passes through the end face of the first wheel shaft (21) close to the second wheel shaft (31), and the second oil circuit (311) is connected to the hydraulic chamber (11) through the delivery oil circuit (12). The input end of the first oil circuit (211) passes through the end face of the second axle (31) close to the first axle (21); when the second roller (32) is in the working position, the second output end of the first oil circuit (211) is in collinear communication with the input end of the second oil circuit (311); when the second roller (32) is in the waiting position, the second output end of the first oil circuit (211) and the input end of the second oil circuit (311) are distributed along the directional interval; the output end of the second oil circuit (311) is in communication with the connection between the second axle (31) and the second roller (32).

2. The variable valve actuation system according to claim 1, characterized in that: Along the axial direction of the first wheel axle (21), the distance between the second output end of the first oil circuit (211) and the input end of the second oil circuit (311) ranges from 0.05 mm to 0.1 mm.

3. The variable valve actuation system according to claim 1, characterized in that: A hollow pin (5) is fixedly provided at the second output end of the first oil circuit (211); a spray hole (51) of the hollow pin (5) is connected to the second output end of the first oil circuit (211); and the spray hole (51) can be connected to the input end of the second oil circuit (311) in a collinear manner or distributed along the directional interval.

4. The variable valve actuation system according to claim 3, characterized in that: The aperture of the spray hole (51) is smaller than the aperture of the second output end of the first oil passage (211); and / or, The aperture of the spray hole (51) is smaller than the aperture of the input end of the second oil passage (311).

5. The variable valve actuation system according to claim 3, characterized in that: One end of the spray hole (51) close to the second oil passage (311) is tapered, and the larger end of the tapered portion is closer to the second oil passage (311) than the smaller end of the tapered portion.

6. The variable valve actuation system according to any one of claims 1 to 5, characterized in that: The first oil circuit (211) comprises a first sub-oil circuit (2111) and a second sub-oil circuit (2112); the input end of the first sub-oil circuit (2111) is connected to the output end of the delivery oil circuit (12), and the output end of the first sub-oil circuit (2111) is connected to the connection between the first wheel axle (21) and the first roller (22); the input end of the second sub-oil circuit (2112) is connected to the first sub-oil circuit (2111), at least the output end of the second sub-oil circuit (2112) is parallel to the axial direction of the first wheel axle (21), and the output end of the second sub-oil circuit (2112) can be connected to the input end of the second oil circuit (311) in a collinear manner or distributed along the directional interval.

7. The variable valve actuation system according to any one of claims 1 to 5, characterized in that: A first oil groove (212) is recessed in the outer peripheral wall of the first wheel shaft (21) and / or the inner peripheral wall of the first roller (22), and the first output end of the first oil circuit (211) is in communication with the first oil groove (212).

8. The variable valve actuation system according to any one of claims 1 to 5, characterized in that: A second oil groove (312) is recessed on the outer peripheral wall of the second wheel shaft (31) and / or the inner peripheral wall of the second roller (32), and the output end of the second oil circuit (311) is in communication with the second oil groove (312).

9. The variable valve actuation system according to any one of claims 1 to 5, characterized in that: The rocker arm body (1) is also provided with an oil inlet (13) and an oil discharge port communicated with the hydraulic chamber (11).

10. An engine, characterized in that A variable valve drive system comprising the variable valve drive system according to any one of claims 1 to 9.

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