Variable valve driving system and engine

Abstract

The invention discloses a variable valve driving system and an engine. According to the variable valve driving system, the input end of a first oil way communicates with a hydraulic cavity through a conveying oil way, the first output end of the first oil way communicates with the joint of a first axle and a first roller, and the second output end of the first oil way penetrates through the end face, close to a second axle, of the first axle; the input end of the second oil way penetrates through the end face, close to the first axle, of the second axle. And when the second roller is in the working position, the second output end of the first oil way is collinearly communicated with the input end of the second oil way. And when the second roller is located at the to-be-operated position, the second output end of the first oil way and the input end of the second oil way are directionally distributed at intervals. The output end of the second oil way communicates with the joint of the second wheel shaft and the second rolling wheel. When the first roller is located at the working position, the joint of the first roller and the first wheel shaft can be lubricated all the time, when the second roller is located at the working position, the joint of the second roller and the second wheel shaft can be lubricated, and smoothness and stability of valve opening and closing are improved.

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 drive system is one of the important components of the engine, which is used to drive the opening and closing of the intake and exhaust valves to achieve the purpose of delivering air into the engine and exhausting the exhaust gas in the engine. At present, as the requirements for reducing fuel consumption and emissions of engines become increasingly stringent, variable valve drive systems are widely studied and applied.

[0003] A variable valve drive system in the prior art is composed of a rocker arm, a roller structure arranged at one end of the rocker arm, an elephant foot arranged at the other end of the rocker arm, and a cam structure; the roller structure includes a first roller fixedly arranged at one end of the rocker arm, and a second roller movably arranged at one end of the rocker arm; the cam structure includes two cams with different profiles; the first roller and the second roller are arranged in a one-to-one correspondence with the two cams, and the two cams are used to drive the first roller and the second roller to move respectively. So that both cams can push the rocker arm to rotate around the fixed axis, drive the elephant foot to drive the valve to open and close, and the valve lifts corresponding to the two cams are different, so that different intake volumes can be achieved. However, there is no lubrication structure suitable for this variable valve drive system in the prior art, 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 that there is no lubrication structure suitable for the above-mentioned variable valve drive system in the prior art, 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 drive system comprises 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 valve to open and close; the first roller structure comprises a first axle connected to the second end of the rocker arm body, and a first roller rotatably sleeved on the first axle; the second roller structure comprises a second axle and a second roller rotatably sleeved on the second axle; the switching assembly can drive the second roller to move in a directional manner and have a working position and a waiting 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 wheel axle is provided with a first oil circuit, and the second wheel axle is provided with a second oil circuit; the input end of the first oil circuit is communicated with the hydraulic chamber through the delivery oil circuit, the first output end of the first oil circuit is communicated with the connection between the first wheel axle and the first roller, the second output end of the first oil circuit passes through the end surface of the first wheel axle close to the second wheel axle, and the input end of the second oil circuit passes through the end surface of the second wheel axle close to the first wheel axle; when the second roller is in the working position, the second output end of the first oil circuit is communicated with the input end of the second oil circuit in a collinear manner; when the second roller is in the waiting working 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 communicated with the connection between the second wheel 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 spacing 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 drive 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 aperture of the spray hole is smaller than the aperture of the input end of the second oil passage.

[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 shape is closer to the second oil circuit than the small end of the tapered shape.

[0014] As a preferred scheme 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 colinear 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 on 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 on the outer circumferential wall of the second wheel axle 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 also provided with an oil inlet and an oil unloading port which are connected to the hydraulic chamber.

[0018] An engine includes the variable valve drive system mentioned above.

[0019] Beneficial effects of the present invention:

[0020] The present invention provides a variable valve drive system and an engine. The variable valve drive 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 valve to open and close. The first roller structure includes a first axle connected to the second end of the rocker arm body, and a first roller rotatably sleeved on the first axle. The second roller structure includes a second axle and a second roller rotatably sleeved on the second axle. The switching assembly can drive the second roller to move in a directional manner and have a working position and a waiting position. A hydraulic chamber is provided at the second end of the rocker arm body. The rocker arm body is provided with a conveying 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 conveying 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 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 distributed along a directional interval. The output end of the second oil circuit is in communication with the connection between the second wheel shaft and the second roller.

[0021] The variable valve drive system can effectively lubricate the connection between the second roller and the second axle when the second roller is in the working position, which can effectively improve the working performance of the second roller and the service life of the second roller and the second axle; secondly, it can always lubricate the connection between the first roller and the first axle, which can effectively improve the working performance of the first roller and the service life of the first roller and the first axle. Thus, the smoothness and stability of valve opening and closing can be effectively improved.

[0022] The present invention also provides an engine, comprising 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 a waiting position for working.

[0026] In the figure:

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

[0028] 2. first roller structure; 21. first wheel shaft; 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 wheel shaft; 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. limiting 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 in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] A variable valve drive system in the prior art is composed of a rocker arm, a roller structure arranged at one end of the rocker arm, an elephant foot arranged at the other end of the rocker arm, and a cam structure; the roller structure includes a first roller fixedly arranged at one end of the rocker arm, and a second roller movably arranged at one end of the rocker arm; the cam structure includes two cams with different profiles; the first roller and the second roller are arranged in a one-to-one correspondence with the two cams, and the two cams are used to drive the first roller and the second roller to move respectively. So that both cams can push the rocker arm to rotate around the fixed axis, drive the elephant foot to drive the valve to open and close, and the valve lifts corresponding to the two cams are different, so that different intake volumes can be achieved. However, there is no lubrication structure suitable for this variable valve drive system in the prior art, 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. Among them, the first end of the rocker arm body 1 is used to drive the valve to open and close. 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 sleeved on the first axle 21. The second roller structure 3 includes a second axle 31 and a second roller 32 rotatably sleeved 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 waiting position.

[0039] Specifically, 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, and the other end of the piston 41 is connected to the second wheel shaft 31. The piston 41 can drive the second roller 32 to move in a directional direction to the working position; the elastic restoring force of the elastic member 42 can drive the second roller 32 to move in a directional direction to the waiting working position. The variable valve drive system also includes a first cam and a second cam whose rotation center lines are colinear. The profile of the first cam is different from the profile of the second cam, and the profile is a curve that characterizes the corresponding relationship between the cam angle and the valve lift. When the second roller 32 is in the working position, the second cam contacts the second roller 32, and the first cam does not contact the first roller 22. When the second roller 32 is in the waiting working position, the second cam does not contact the second roller 32, and the first cam contacts the first roller 22. The rocker arm body 1 is rotatably sleeved on the rocker arm shaft.

[0040] When the second roller 32 is to be moved to the working position, hydraulic oil is delivered into the hydraulic chamber 11 to apply pressure to the piston 41, so that the piston 41 can drive the second roller 32 to move to the working position in a directional manner. During this process, the elastic member 42 is elastically deformed by the force applied thereto. After the second roller 32 moves to the working position in a directional manner, the pressure of the hydraulic oil in the hydraulic chamber 11 is maintained so that the second roller 32 can remain in the working position. When the second roller 32 is in the working position, the second cam contacts the second roller 32, and the rotation of the second cam can drive the rocker body 1 to rotate relative to the rocker shaft, thereby driving the first end of the rocker body 1 to drive the valve to open and close. When the valve lift is to be changed, the hydraulic oil in the hydraulic chamber 11 is controlled to release pressure, and the elastic restoring force of the elastic member 42 drives the second roller 32 to move from the working position to the waiting position along the orientation, so that the second cam is not in contact with the second roller 32, and the first cam is in contact with the first roller 22. The rotation of the first cam can drive the rocker body 1 to rotate relative to the rocker shaft, thereby also driving the first end of the rocker body 1 to drive the valve to open and close. Since the profile of the first cam is different from that of the second cam, 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 or abutted to the end of the piston 41 extending out of the hydraulic chamber 11. In the process of the second roller 32 moving from the waiting position to the working position along the orientation, the elastic member 42 can be elastically deformed. 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 orientation. Specifically, in this embodiment, Figure 1 As shown, there are two elastic members 42 , and the two elastic members 42 are respectively located on two sides of the second roller 32 .

[0042] Among them, Figure 1-3 As shown, 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 connected to the hydraulic chamber 11 through the delivery oil circuit 12, the first output end of the first oil circuit 211 is connected to 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 surface of the first wheel shaft 21 close to the second wheel shaft 31, and the input end of the second oil circuit 311 passes through the end surface of the second wheel shaft 31 close to the first wheel shaft 21. When the second roller 32 is in the working position, the second output end of the first oil circuit 211 is connected to the input end of the second oil circuit 311 in a collinear manner. 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 a directional interval. The output end of the second oil circuit 311 is connected to the connection between the second wheel shaft 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 is synchronously connected with the input end of the second oil circuit 311 in a colinear 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 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 axle 31.

[0044] When the valve lift is to be changed, that is, when the second roller 32 is to be moved to the waiting position, the hydraulic oil in the hydraulic chamber 11 is controlled to be depressurized, and the elastic restoring force of the elastic member 42 drives the second roller 32 to move from the working position to the waiting position in a directional manner, so that the amount of hydraulic oil in the hydraulic chamber 11 is reduced, and the second output end of the first oil circuit 211 and the input end of the second oil circuit 311 are distributed at intervals in a directional manner, and no hydraulic oil is transported to the second oil circuit 311. In this way, the amount of hydraulic oil leaked between the second output end of the first oil circuit 211 and the input end of the second oil circuit 311 can also be reduced.

[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 in a connected state, so that the connection between the first roller 22 and the first axle 21 can always be lubricated. Therefore, the working performance of the first roller 22 can be effectively improved, and the service life of the first roller 22 and the first axle 21 can be effectively improved.

[0046] Therefore, the variable valve drive 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, which can effectively improve the working performance of the second roller 32 and 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, which can effectively improve the working performance of the first roller 22 and the service life of the first roller 22 and the first axle 21. Therefore, the smoothness and stability of valve opening and closing can be effectively improved.

[0047] It is understandable that the hydraulic oil driving the piston 41 to move in a directional manner, the hydraulic oil lubricating the connection between the first roller 22 and the first axle 21, and the hydraulic oil lubricating the connection between the second roller 32 and the second axle 31 share a hydraulic chamber 11. The structure of the rocker arm body 1 can be simplified, and the processing cost, volume and weight of the rocker arm body 1 can be reduced.

[0048] Specifically, in this embodiment, the first axle 21 is fixedly connected to the second end of the rocker body 1. As an alternative, the first axle 21 is rotatably connected to the second end of the rocker 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 connection 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 connection seat 43. As an alternative, one end of the connection seat 43 is fixedly connected to the end of the piston 41 extending out of the hydraulic chamber 11, the second axle 31 is rotatably connected to the connection 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, Figure 2 and Figure 3 As shown, the rocker arm body 1 is also provided with an oil inlet 13 and an oil discharge port which are connected to the hydraulic chamber 11. The hydraulic oil is delivered to the hydraulic chamber 11 through the oil inlet 13. The hydraulic oil in the hydraulic chamber 11 is discharged 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 is to reduce the 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 as much as possible. It can be understood that, along the axial direction of the first axle 21, the end face of the second output end of the first oil circuit 211 is coplanar with the end face of the first axle 21 close to the second axle 31. The end face of the input end of the second oil circuit 311 is coplanar with the end face of the second axle 31 close to 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, if Figure 2 and Figure 3 As shown, a hollow pin 5 is fixedly provided at the second output end of the first oil circuit 211, and a spray hole 51 of the hollow pin 5 is connected to the second output end of the first oil circuit 211. The spray holes 51 can be connected to the input end of the second oil circuit 311 in a colinear manner or distributed along a directional interval. By providing 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; secondly, by providing 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, and different hollow pins 5 have different apertures of the spray holes 51, so that the injection force of the hydraulic oil injected to 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 circuit 211, and the hollow pin 5 is inserted in the slot 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 circuit 211 is coplanar with the end face of the first axle 21 close to the second axle 31.

[0054] More preferably, if Figure 2 and Figure 3 As shown, the aperture of the spray hole 51 is smaller than the aperture of the second output end of the first oil circuit 211. Such a configuration 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 into the second oil circuit 311 well, which can effectively improve the reliability of the hydraulic oil flowing into the second oil circuit 311.

[0055] More preferably, if 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 such arrangement, when the second roller 32 is located at the working position, the hydraulic oil sprayed from the spray hole 51 can further flow into the second oil circuit 311 well.

[0056] Further preferably, the end of the spray hole 51 close to the second oil path 311 is tapered, and the large end of the cone is closer to the second oil path 311 than the small end of the cone. In this way, when the second roller 32 is in the standby position, the risk of cavitation of the second wheel shaft 31 by the hydraulic oil sprayed from the spray hole 51 can be reduced.

[0057] Specifically, Figure 2 and Figure 3 As shown, the first oil circuit 211 includes 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 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, and at least the output end of the second sub-oil circuit 2112 is parallel to the axial direction of the first 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 colinear manner or distributed along a directional interval. Specifically, a slot is provided at the output end of the second sub-oil circuit 2112, and the hollow pin 5 is inserted in the slot with interference fit. In this way, the hydraulic oil in the hydraulic chamber 11 can be delivered to the connection between the first roller 22 and the first axle 21, and can be delivered to 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 distributed and connected. The output end of the second sub-oil circuit 2112 can be connected to the input end of the third sub-oil circuit 3111 in a colinear manner or distributed along a directional interval. The output end of the fourth sub-oil circuit 3112 is connected to the connection between the second wheel shaft 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 collinear.

[0061] Preferably, if Figure 2 and Figure 3 As shown, the outer peripheral wall of the first axle 21 and / or the inner peripheral wall of the first roller 22 is recessed with a first oil groove 212, and the first output end of the first oil circuit 211 is connected to the first oil groove 212. That is, 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 part of the hydraulic oil, thereby further improving the effect and reliability of lubricating the connection between the first axle 21 and the first roller 22.

[0062] More preferably, if Figure 2 and Figure 3 As shown, the end surface area of ​​the output end of the first sub-oil path 2111 is smaller than the opening area of ​​the first oil groove 212. The output end of the first sub-oil path 2111 is located in the area where the opening of the first oil groove 212 is located, so as to further improve the effect and reliability of lubricating the connection between the first wheel shaft 21 and the first roller 22.

[0063] Preferably, if Figure 2 and Figure 3 As shown, the outer circumferential wall of the second axle 31 and / or the inner circumferential wall of the second roller 32 is recessed with a second oil groove 312, and the output end of the second oil circuit 311 is connected to the second oil groove 312. That is, 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 part of the hydraulic oil, thereby further improving the effect and reliability of lubricating the connection between the second axle 31 and the second roller 32.

[0064] More preferably, if Figure 2 and Figure 3 As shown, the end surface area of ​​the output end of the fourth sub-oil circuit 3112 is smaller than the opening area of ​​the second oil groove 312. The output end of the fourth sub-oil circuit 3112 is located in the area where the opening of the second oil groove 312 is located, so as to further improve the effect and reliability of lubricating the connection between the second wheel shaft 31 and the second roller 32.

[0065] Alternatively, if 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 located at the working position, the limit block 431 is inserted into the limit groove along the orientation 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 orientation during the process of moving from the waiting position to the working position, so as to improve 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 connection seat 43 is provided with a limit block 431, and the second end of the rocker body 1 is provided with a limit groove. As an alternative, the connection seat 43 can also be provided with a limit groove, and the second end of the rocker body 1 can be provided with a limit block 431.

[0066] Specifically, 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 one end of the elephant foot 61 is provided with a locking nut 62 threadedly connected thereto. The other end of the elephant foot 61 is used to connect with the valve. After loosening the locking nut 62, the position of the elephant foot 61 can be adjusted by rotating the elephant foot 61; tightening the locking nut 62 can lock the elephant foot 61 with the rocker arm body 1. This allows the setting position of the elephant foot 61 to be adjusted, thereby allowing the setting position of the valve to be adjusted. Among them, the connection structure of the elephant foot 61 and the valve belongs to the prior art and will not be repeated here.

[0067] The present invention also provides an engine, comprising 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 clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope 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; the characteristics are: The second end of the rocker arm body (1) is provided with a hydraulic chamber (11); The rocker arm body (1) is provided with an oil delivery 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); an input end of the first oil circuit (211) is communicated with the hydraulic chamber (11) through the oil delivery circuit (12), a first output end of the first oil circuit (211) is communicated with a connection point between the first wheel shaft (21) and the first roller (22), a second output end of the first oil circuit (211) passes through an end surface of the first wheel shaft (21) close to the second wheel shaft (31), and a second output end of the second oil circuit (311) is communicated with a connection point between the first wheel shaft (21) and the first roller (22). The input end of the first oil circuit (211) passes through the end surface 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 passage (211) and the input end of the second oil passage (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 colinear manner or distributed along the directional interval.

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

6. The variable valve drive 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 colinear manner or distributed along the directional interval.

7. The variable valve drive 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 passage (211) is in communication with the first oil groove (212).

8. The variable valve drive 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 passage (311) is in communication with the second oil groove (312).

9. The variable valve drive 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 which are communicated with the hydraulic chamber (11).

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

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