Buffer structure and engine rocker arm

Abstract

The utility model provides a buffering structure and an engine rocker arm, the buffering structure is suitable for the engine rocker arm, the engine rocker arm comprises a rocker arm body, a transmission portion and a connecting portion, the buffering structure comprises a buffering piece, and the end portion of the buffering piece is used for abutting against one end of the connecting portion. The other end of the connecting part is used for extruding the air valve to move in the first preset direction and towards the direction close to the piston, and the buffering piece has a first state and a second state; when the buffer part is in the first state, the buffer part extends in the first preset direction; when the buffering piece is in the second state, the buffering piece is bent in the second preset direction, and the first preset direction is perpendicular to the second preset direction; and the extrusion assembly abuts against the buffer part, and the extrusion assembly is movably arranged in the second preset direction so as to drive the buffer part to be switched between the first state and the second state. The buffering structure solves the problem that the working reliability of an engine in the prior art is poor.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a buffer structure and an engine rocker arm. Background Art

[0002] When the engine is in normal operating condition, Figure 4 As shown, the rotation of the crankshaft 110 drives the camshaft gear 140 to rotate, and the camshaft gear 140 drives the camshaft 130 to rotate. The camshaft 130 drives the rocker arm 150 to move through the valve push rod 190, and the connecting part of the rocker arm 150 presses the valve 160 downward so that the valve 160 moves downward until the valve 160 opens. At this time, the piston 120 located below the valve is driven by the crankshaft 110 to move downward synchronously;

[0003] When the engine is in an overspeed condition, the movement inertia and self-excited vibration of the valve intensify, which may cause the valve to fly off and jump, making the movement trajectory of the valve out of sync with the piston, causing the valve to open early or close late, making it easy for the valve 160 and the piston 120 to collide, affecting the working reliability of the engine. Utility Model Content

[0004] The main purpose of the utility model is to provide a buffer structure and an engine rocker arm to solve the problem of poor working reliability of the engine in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a buffer structure, which is suitable for an engine rocker arm. The engine rocker arm includes a rocker arm body, a transmission part and a connecting part. The buffer structure, the transmission part and the connecting part are all arranged in the rocker arm body. The buffer structure includes: a buffer member, an end of the buffer member is used to abut against one end of the connecting part, and the other end of the connecting part is used to squeeze the valve to make it move along a first preset direction and toward a direction close to the piston. The buffer member has a first state and a second state; when the buffer member is in the first state, the buffer member is extended along the first preset direction; when the buffer member is in the second state, the buffer member is bent along the second preset direction, and the first preset direction is arranged perpendicular to the second preset direction; an extrusion assembly, the extrusion assembly abuts against the buffer member, and the extrusion assembly is movably arranged along the second preset direction to drive the buffer member to switch between the first state and the second state.

[0006] Furthermore, the buffer member includes a connecting shaft, a first buffer portion and a second buffer portion, and the connecting shaft is passed through the first end of the first buffer portion and the first end of the second buffer portion so that the first buffer portion and the second buffer portion are hinged, so that the first buffer portion and the second buffer portion are driven to rotate around the connecting shaft at a preset angle through an extrusion assembly, so that the buffer member can switch between the first state and the second state.

[0007] Furthermore, the extrusion assembly includes a first extrusion member and a second extrusion member. Along a second preset direction, the first extrusion member and the second extrusion member are respectively arranged on both sides of the buffer member and abut against the buffer member. The first extrusion member and the second extrusion member are both movably arranged along the second preset direction to drive the first buffer part and the second buffer part to rotate around the connecting axis by a preset angle.

[0008] Furthermore, the rocker arm body has a first groove portion and a second groove portion, the first groove portion is extended along a first preset direction, and the second groove portion is extended along a second preset direction; the first groove portion and the second groove portion are cross-arranged and connected, so that the second groove portion includes a third groove section and a fourth groove section respectively arranged on both sides of the first groove portion; the first extrusion member and the second extrusion member are respectively movably arranged in the third groove section and the fourth groove section, and the buffer member is arranged at the intersection position of the first groove portion and the second groove portion.

[0009] Furthermore, the first groove portion includes a fifth groove section and a sixth groove section respectively arranged on both sides of the second groove portion, the transmission portion is movably arranged in the fifth groove section along the first preset direction, and the connecting portion is movably arranged in the sixth groove section along the first preset direction; the two ends of the buffer component are respectively abutted against the transmission portion and the connecting portion, so that when the buffer component is in the first state, the transmission portion drives the connecting portion to move along the first preset direction and toward the direction close to the piston through the buffer component.

[0010] Furthermore, the second end of the first buffer portion abuts against the first mounting groove on the transmission portion, and the second end of the second buffer portion abuts against the second mounting groove on the connecting portion.

[0011] Furthermore, the second extrusion member includes a third side wall and a fourth side wall arranged opposite to each other along a second preset direction, the third side wall abuts against the buffer member, and the fourth side wall and the groove wall of the fourth groove section together form a accommodating space for accommodating oil, so that when the oil flows into the accommodating space, the second extrusion member is pushed to move along the second preset direction and toward the direction close to the buffer member, so that the buffer member is in the first state; and when the oil flows out of the accommodating space, the second extrusion member moves along the second preset direction toward the direction away from the buffer member, so that the buffer member switches to the second state.

[0012] Furthermore, the buffer structure also includes an elastic part, one end of the elastic part is connected to the bottom of the third groove section, and the other end of the elastic part is connected to the first extrusion member. When the buffer member is in the first state, the elastic part is squeezed, and when the second extrusion member moves along the second preset direction and in a direction away from the buffer member, the elastic part restores the elastic deformation to drive the first extrusion member to move along the second preset direction toward a direction close to the buffer member.

[0013] Furthermore, the first extrusion member includes an extrusion portion and two guide portions, the two guide portions are respectively connected to the two ends of the extrusion portion, and the side walls of the guide portions are in contact with the groove walls of the third groove segment and are slidably arranged along the groove walls of the third groove segment to guide the first extrusion member.

[0014] The utility model provides an engine rocker arm, comprising a rocker arm body, a transmission part and a connecting part. The engine rocker arm also comprises the above-mentioned buffer structure.

[0015] By applying the technical solution of the utility model, the buffer structure includes a buffer and an extrusion assembly. When the engine is in an overspeed condition, the extrusion assembly moves along a second preset direction, driving the buffer to bend along the second preset direction. Since the end of the buffer is connected to the connecting part, the buffer drives the connecting part to move along the first preset direction toward the direction close to the buffer. The connecting part stops squeezing the valve downward, and the valve no longer moves downward, thereby increasing the distance between the valve and the piston, thereby avoiding collision between the piston and the valve, thereby ensuring the working reliability of the engine, thereby solving the problem of poor working reliability of the engine in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A schematic structural diagram of an embodiment of a rocker arm buffer member in a second state according to the utility model is shown;

[0018] Figure 2 A schematic structural diagram showing an embodiment of a rocker arm buffer member in a first state according to the utility model;

[0019] Figure 3 The following is a flowchart showing the buffer structure according to the present invention;

[0020] Figure 4 A schematic diagram of the cooperation between a valve and a piston in the prior art is shown.

[0021] The above drawings include the following reference numerals:

[0022] 1. rocker arm body; 2. transmission part; 3. connecting part; 10. buffer member; 20. first extrusion member; 30. second extrusion member; 11. first groove part; 12. second groove part; 121. third groove section; 122. fourth groove section; 111. fifth groove section; 112. sixth groove section; 31. third side wall; 32. fourth side wall; 33. accommodating space; 40. elastic part; 21. extrusion part; 22. guide part; 211. first side wall; 212. second side wall; 19. connecting shaft; 191. first buffer part; 192. second buffer part; 201. first mounting groove; 301. second mounting groove; 110. crankshaft; 140. camshaft gear; 130. camshaft; 190. valve push rod; 150. rocker arm; 120. piston; 160. valve. DETAILED DESCRIPTION

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0024] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0025] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0026] The utility model provides a buffer structure, please refer to Figure 1 and Figure 2 , suitable for engine rocker arms, the engine rocker arms include a rocker body 1, a transmission part 2 and a connecting part 3, the buffer structure, the transmission part 2 and the connecting part 3 are all arranged in the rocker body 1, the buffer structure includes: a buffer 10, the end of the buffer 10 is used to abut against one end of the connecting part 3, the other end of the connecting part 3 is used to squeeze the valve to make it move along a first preset direction and toward a direction close to the piston, the buffer 10 has a first state and a second state; when the buffer 10 is in the first state, the buffer 10 is extended along the first preset direction; when the buffer 10 is in the second state, the buffer 10 is bent along the second preset direction, and the first preset direction is arranged perpendicular to the second preset direction; an extrusion assembly, the extrusion assembly abuts against the buffer 10, and the extrusion assembly is movably arranged along the second preset direction to drive the buffer 10 to switch between the first state and the second state.

[0027] The buffer structure of the utility model includes a buffer 10 and an extrusion assembly. When the engine is in an overspeed condition, the extrusion assembly moves along a second preset direction, driving the buffer 10 to bend along the second preset direction. Since the end of the buffer is connected to the connecting portion 3, the buffer 10 drives the connecting portion 3 to move along the first preset direction toward the direction close to the buffer 10, and the connecting portion 3 stops squeezing the valve downward, and the valve no longer moves downward, so that the distance between the valve and the piston is increased, thereby avoiding collision between the piston and the valve, thereby ensuring the working reliability of the engine, thereby solving the problem of poor working reliability of the engine in the prior art.

[0028] In this embodiment, if Figure 1 and Figure 2 As shown, the buffer 10 includes a connecting shaft 19, a first buffer portion 191 and a second buffer portion 192, and the connecting shaft 19 is passed through the first end of the first buffer portion 191 and the first end of the second buffer portion 192, so that the first buffer portion 191 and the second buffer portion 192 are hinged, so as to drive the first buffer portion 191 and the second buffer portion 192 to rotate around the connecting shaft 19 by a preset angle through an extrusion assembly, so that the buffer 10 can switch between the first state and the second state.

[0029] Specifically, the extrusion assembly drives the first buffer portion 191 and the second buffer portion 192 to rotate around the connecting shaft 19 at a preset angle, so that the buffer 10 bends along a second preset direction, so that the buffer 10 switches from the first state to the second state.

[0030] Specifically, the buffer 10 is a flexible chain.

[0031] In this embodiment, if Figure 1 and Figure 2As shown, the extrusion assembly includes a first extrusion member 20 and a second extrusion member 30. Along the second preset direction, the first extrusion member 20 and the second extrusion member 30 are respectively arranged on both sides of the buffer member 10 and abut against the buffer member 10. The first extrusion member 20 and the second extrusion member 30 are both movably arranged along the second preset direction to drive the first buffer portion 191 and the second buffer portion 192 to rotate around the connecting shaft 19 by a preset angle.

[0032] Specifically, when the engine is in an overspeed condition, the second extrusion member 30 moves along the second preset direction toward a direction away from the buffer member 10, and the first extrusion member 20 moves along the second preset direction toward a direction close to the buffer member 10, the first extrusion member 20 and the second extrusion member 30 jointly drive the first buffer portion 191 and the second buffer portion 192 to rotate around the connecting shaft 19 by a preset angle, so that the buffer member 10 bends.

[0033] In this embodiment, the rocker arm body 1 has a first groove portion 11 and a second groove portion 12, the first groove portion 11 is extended along a first preset direction, and the second groove portion 12 is extended along a second preset direction; the first groove portion 11 and the second groove portion 12 are cross-arranged and connected, so that the second groove portion 12 includes a third groove section 121 and a fourth groove section 122 respectively arranged on both sides of the first groove portion 11; the first extrusion member 20 and the second extrusion member 30 are respectively movably arranged in the third groove section 121 and the fourth groove section 122, and the buffer member 10 is arranged at the intersection of the first groove portion 11 and the second groove portion 12.

[0034] Specifically, by movably arranging the first extrusion member 20 and the second extrusion member 30 in the third groove section 121 and the fourth groove section 122 respectively, so as to ensure that the first extrusion member 20 and the second extrusion member 30 can make reciprocating linear motion along the second preset direction, the first extrusion member 20 and the second extrusion member 30 jointly drive the first buffer portion 191 and the second buffer portion 192 to rotate around the connecting shaft 19 by a preset angle, thereby ensuring that the buffer member 10 is fully bent.

[0035] Specifically, the first preset direction is as follows: Figure 1 The vertical direction shown, the second preset direction is Figure 1 Horizontal direction as shown in .

[0036] In this embodiment, if Figure 1 and Figure 2As shown, the first groove portion 11 includes a fifth groove section 111 and a sixth groove section 112 respectively arranged on both sides of the second groove portion 12, the transmission portion 2 is movably arranged in the fifth groove section 111 along the first preset direction, and the connecting portion 3 is movably arranged in the sixth groove section 112 along the first preset direction; the two ends of the buffer 10 are respectively abutted against the transmission portion 2 and the connecting portion 3, so that when the buffer 10 is in the first state, the transmission portion 2 drives the connecting portion to move along the first preset direction and toward the direction close to the piston through the buffer 10.

[0037] Specifically, when the engine is in normal operating conditions, the buffer 10 is in the first state, and the transmission part 2 drives the connecting part to move along the first preset direction toward the piston through the buffer 10, so that the connecting part 3 drives the valve to move along the direction toward the piston until the valve opens.

[0038] In this embodiment, if Figure 1 and Figure 2 As shown, the second end of the first buffer portion 191 abuts against the first mounting groove 201 on the transmission portion 2, and the second end of the second buffer portion 192 abuts against the second mounting groove 301 on the connecting portion 3. Such an arrangement ensures the abutment reliability of the buffer 10 with the transmission portion 2 and the connecting portion 3, and prevents the buffer 10 from being separated from the transmission portion 2 or the connecting portion 3 during bending.

[0039] Specifically, when the first buffer portion 191 and the second buffer portion 192 are squeezed, the second end of the first buffer portion 191 moves toward the groove wall of the first mounting groove 201 close to the second extrusion component 30, so that a portion of the end surface of the first buffer portion 191 is in contact with the groove wall of the first mounting groove 201 close to the second extrusion component 30; the second end of the second buffer portion 192 moves toward the groove wall of the second mounting groove 301 close to the second extrusion component 30, so that a portion of the end surface of the second buffer portion 192 is in contact with the groove wall of the second mounting groove 301 close to the second extrusion component 30.

[0040] In this embodiment, if Figure 1 and Figure 2 As shown, the second extrusion member 30 includes a third side wall 31 and a fourth side wall 32 which are arranged relatively along a second preset direction, the third side wall 31 abuts against the buffer member 10, and the fourth side wall 32 and the groove wall of the fourth groove section 122 together form a receiving space 33 for receiving oil, so that when the oil flows into the receiving space 33, the second extrusion member 30 is pushed to move along the second preset direction and toward the direction close to the buffer member 10, so that the buffer member 10 is in the first state; and when the oil flows out of the receiving space 33, the second extrusion member 30 moves along the second preset direction toward the direction away from the buffer member 10, so that the buffer member 10 switches to the second state.

[0041] Specifically, when the engine is in a normal operating condition, the oil enters the accommodating space 33, causing the second extrusion member 30 to move along the second preset direction toward the direction close to the buffer member 10, so that the buffer member 10 remains in the first state; when the engine is in an overspeed condition, the oil flows out of the accommodating space 33, causing the second extrusion member 30 to move along the second preset direction toward the direction away from the buffer member 10. At this time, the first extrusion member 20 moves along the second preset direction toward the direction close to the buffer member 10, and the buffer member 10 bends.

[0042] In this embodiment, if Figure 1 and Figure 2 As shown, a liquid injection hole is provided at the bottom of the fourth groove section 122, and both ends of the liquid injection hole are respectively connected to the accommodating space 33 and the liquid injection pipeline. A solenoid valve is provided on the liquid injection pipeline, and the solenoid valve can be opened and closed. When the engine is in an overspeed condition, the solenoid valve opens, and the oil in the accommodating space 33 enters the liquid injection pipeline through the liquid injection hole, and the second extrusion member 30 moves along the second preset direction toward a direction away from the buffer member 10.

[0043] Specifically, the flow direction of the oil in the accommodating space 33 is controlled by the solenoid valve, thereby controlling the moving direction of the second extrusion member 30. When the engine is in a normal working condition, the solenoid valve is opened, and the oil in the injection pipeline enters the accommodating space 33, so that the second extrusion member 30 moves in the second preset direction toward the direction close to the buffer member 10, so that the buffer member 10 remains in the first state, and then the solenoid valve is closed; when the engine is in an overspeed working condition, the solenoid valve is opened, and the oil in the accommodating space 33 flows into the injection pipeline through the injection hole, so that the second extrusion member 30 moves in the second preset direction toward the direction away from the buffer member 10.

[0044] In this embodiment, if Figure 1 and Figure 2 As shown, the buffer structure also includes an elastic portion 40, one end of the elastic portion 40 is connected to the bottom of the third slot section 121, and the other end of the elastic portion 40 is connected to the first extrusion member 20. When the buffer 10 is in the first state, the elastic portion 40 is squeezed. When the second extrusion member 30 moves along the second preset direction and in a direction away from the buffer 10, the elastic portion 40 restores its elastic deformation to drive the first extrusion member 20 to move along the second preset direction in a direction close to the buffer 10.

[0045] Specifically, when the buffer 10 is in the first state, the second extrusion member 30 squeezes the first extrusion member 20 through the buffer 10, and the first extrusion member squeezes the elastic part 40 to cause it to elastically deform. When the second extrusion member 30 moves along the second preset direction toward a direction away from the buffer 10, the elastic part 40 restores the elastic deformation to drive the first extrusion member 20 to move along the second preset direction toward a direction close to the buffer 10, so that the buffer 10 bends.

[0046] In this embodiment, if Figure 1 and Figure 2 As shown, the first extrusion member 20 includes an extrusion portion 21 and two guide portions 22, the two guide portions 22 are respectively connected to the two ends of the extrusion portion 21, and the side walls of the guide portions 22 are in contact with the groove walls of the third groove section 121 and are slidably arranged along the groove walls of the third groove section 121 to guide the first extrusion member 20.

[0047] Specifically, the side wall of the guide portion 22 is in contact with the groove wall of the third groove section 121 and is slidably arranged along the groove wall of the third groove section 121, thereby ensuring that the third groove section 121 can guide the first extrusion component 20, so that the first extrusion component 20 can only move along the second preset direction, thereby preventing the first extrusion component 20 from being unable to fully extrude the buffer component 10, resulting in a smaller bending amplitude of the buffer component 10, and causing the gap between the valve and the piston to be too small.

[0048] Specifically, the extrusion portion 21 includes a first side wall 211 and a second side wall 212 that are arranged opposite to each other along the second preset direction, the first side wall 211 is connected to the elastic portion 40, and the second side wall 212 abuts against the middle of the buffer 10, wherein the second side wall 212 extends along the first preset direction. Such an arrangement ensures that there is a sufficient contact area between the extrusion portion 21 and the buffer 10, thereby ensuring that the first extrusion member 20 can fully extrude the middle of the buffer 10, so that the buffer 10 is fully bent, and the bending amplitude of the buffer 10 is prevented from being too small.

[0049] The utility model also provides an engine rocker arm, including a rocker arm body 1, a transmission part 2 and a connecting part 3, and the engine rocker arm also includes the above-mentioned buffer structure. The buffer structure includes a buffer 10 and an extrusion assembly. When the engine is in an overspeed condition, the extrusion assembly moves along the second preset direction, driving the buffer 10 to bend along the second preset direction. Since the end of the buffer is connected to the connecting part 3, the buffer 10 drives the connecting part 3 to move along the first preset direction toward the direction close to the buffer 10, and the connecting part 3 stops squeezing the valve downward, and the valve no longer moves downward, so that the distance between the valve and the piston is increased, thereby avoiding the collision between the piston and the valve, thereby ensuring the working reliability of the engine, thereby solving the problem of poor working reliability of the engine in the prior art.

[0050] Specifically, Figure 3As shown, a speed detector is provided in the engine to monitor the engine speed in real time, and feed back the detection result to the controller. When the controller detects that the engine speed exceeds the set speed, the controller controls the solenoid valve to open, the oil in the accommodating space 33 flows out, the connecting part retracts, and the valve rises; when the controller detects that the engine speed is less than or equal to the set speed, the controller controls the solenoid valve to close, the oil in the accommodating space 33 keeps squeezing the second extrusion member 30, the connecting part keeps squeezing the valve, and the valve works normally.

[0051] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0052] The buffer structure of the utility model includes a buffer 10 and an extrusion assembly. When the engine is in an overspeed condition, the extrusion assembly moves along a second preset direction, driving the buffer 10 to bend along the second preset direction. Since the end of the buffer is connected to the connecting portion 3, the buffer 10 drives the connecting portion 3 to move along the first preset direction toward the direction close to the buffer 10, and the connecting portion 3 stops squeezing the valve downward, and the valve no longer moves downward, so that the distance between the valve and the piston is increased, thereby avoiding collision between the piston and the valve, thereby ensuring the working reliability of the engine, thereby solving the problem of poor working reliability of the engine in the prior art.

[0053] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0054] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0055] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A buffer structure, suitable for an engine rocker arm, the engine rocker arm comprising a rocker arm body (1), a transmission part (2) and a connecting part (3), the buffer structure, the transmission part (2) and the connecting part (3) are all arranged in the rocker arm body (1), characterized in that: The buffer structure comprises: A buffer (10), wherein an end of the buffer (10) is used to abut against one end of the connecting portion (3), and the other end of the connecting portion (3) is used to squeeze the valve so that it moves along a first preset direction and toward a direction close to the piston, and the buffer (10) has a first state and a second state; when the buffer (10) is in the first state, the buffer (10) is extended along the first preset direction; when the buffer (10) is in the second state, the buffer (10) is bent along the second preset direction, and the first preset direction is perpendicular to the second preset direction; An extrusion component is in abutment with the buffer member (10), and the extrusion component is movably arranged along the second preset direction to drive the buffer member (10) to switch between the first state and the second state.

2. The buffer structure according to claim 1, characterized in that: The buffer member (10) comprises a connecting shaft (19), a first buffer portion (191) and a second buffer portion (192); the connecting shaft (19) is passed through a first end of the first buffer portion (191) and a first end of the second buffer portion (192) so that the first buffer portion (191) and the second buffer portion (192) are hingedly connected, so that the first buffer portion (191) and the second buffer portion (192) are driven by the extrusion assembly to rotate around the connecting shaft (19) at a preset angle, so that the buffer member (10) is switched between the first state and the second state.

3. The buffer structure according to claim 2, characterized in that: The extrusion assembly comprises a first extrusion member (20) and a second extrusion member (30). Along the second preset direction, the first extrusion member (20) and the second extrusion member (30) are respectively arranged on both sides of the buffer member (10) and abut against the buffer member (10). The first extrusion member (20) and the second extrusion member (30) are both movably arranged along the second preset direction to drive the first buffer portion (191) and the second buffer portion (192) to rotate around the connecting shaft (19) by a preset angle.

4. The buffer structure according to claim 3, characterized in that: The rocker arm body (1) comprises a first groove portion (11) and a second groove portion (12), wherein the first groove portion (11) is extended along the first preset direction, and the second groove portion (12) is extended along the second preset direction; The first groove portion (11) and the second groove portion (12) are cross-arranged and connected, so that the second groove portion (12) includes a third groove section (121) and a fourth groove section (122) respectively arranged on both sides of the first groove portion (11); The first extrusion member (20) and the second extrusion member (30) are movably arranged in the third slot section (121) and the fourth slot section (122), respectively, and the buffer member (10) is arranged at the intersection of the first slot portion (11) and the second slot portion (12).

5. The buffer structure according to claim 4, characterized in that: The first slot portion (11) comprises a fifth slot section (111) and a sixth slot section (112) respectively arranged on both sides of the second slot portion (12); the transmission portion (2) is movably arranged in the fifth slot section (111) along the first preset direction; and the connection portion (3) is movably arranged in the sixth slot section (112) along the first preset direction; The two ends of the buffer member (10) are respectively in contact with the transmission part (2) and the connecting part (3), so that when the buffer member (10) is in the first state, the transmission part (2) drives the connecting part to move along the first preset direction and towards the direction close to the piston through the buffer member (10).

6. The buffer structure according to claim 5, characterized in that: The second end of the first buffer portion (191) abuts against the first mounting groove (201) on the transmission portion (2), and the second end of the second buffer portion (192) abuts against the second mounting groove (301) on the connecting portion (3).

7. The buffer structure according to claim 4, characterized in that: The second extrusion member (30) comprises a third side wall (31) and a fourth side wall (32) which are arranged opposite to each other along the second preset direction, the third side wall (31) abuts against the buffer member (10), and the fourth side wall (32) and the groove wall of the fourth groove section (122) together form a receiving space (33) for receiving oil, so that when the oil flows into the receiving space (33), the second extrusion member (30) is pushed to move along the second preset direction and in a direction close to the buffer member (10), so that the buffer member (10) is in the first state; and when the oil flows out of the receiving space (33), the second extrusion member (30) moves along the second preset direction in a direction away from the buffer member (10), so that the buffer member (10) is switched to the second state.

8. The buffer structure according to claim 4, characterized in that: The buffer structure further comprises an elastic part (40), one end of the elastic part (40) being connected to the groove bottom of the third groove section (121), and the other end of the elastic part (40) being connected to the first extrusion member (20); when the buffer member (10) is in the first state, the elastic part (40) is extruded; when the second extrusion member (30) moves along the second preset direction and in a direction away from the buffer member (10), the elastic part (40) restores its elastic deformation to drive the first extrusion member (20) to move along the second preset direction in a direction close to the buffer member (10).

9. The buffer structure according to claim 4, characterized in that: The first extrusion member (20) comprises an extrusion portion (21) and two guide portions (22), wherein the two guide portions (22) are respectively connected to two ends of the extrusion portion (21), and the side walls of the guide portions (22) are in contact with the groove walls of the third groove section (121) and are slidably arranged along the groove walls of the third groove section (121) to guide the first extrusion member (20).

10. An engine rocker arm, comprising a rocker arm body (1), a transmission part (2) and a connecting part (3), characterized in that: The engine rocker arm further comprises a buffer structure according to any one of claims 1 to 9.

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