Rocker arm structure and engine

Abstract

The embodiment of the utility model provides a rocker arm structure and an engine, and relates to the field of engines. The rocker arm structure comprises a valve side half rocker arm, a roller side half rocker arm and an ejector rod, the roller side half rocker arm and the valve side half rocker arm are both connected to a rocker arm shaft, the ejector rod is arranged on the roller side half rocker arm, and the ejector rod can move, so that the valve side half rocker arm and the roller side half rocker arm are in hard connection or lost connection. In a normal working state, the valve side half rocker arm is in hard connection with the roller side half rocker arm, the roller side half rocker arm swings to transmit lift motion to the valve side half rocker arm, and the valve side half rocker arm opens an exhaust valve; and in the loss working state, the valve side half rocker arm is in loss connection with the roller side half rocker arm, and the roller side half rocker arm swings and cannot transmit the lift motion to the valve side half rocker arm, so that the loss function is realized. Compared with the existing mode that oil pressure is adopted for transmitting the valve lift to generate fluctuation, the rocker arm structure in the embodiment of the utility model adopts the ejector rod for transmission, and the valve lift transmission is stable without fluctuation.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of engine, specifically, a rocker arm structure and engine. BACKGROUND

[0002] One operation cycle of the engine includes the intake stroke, compression stroke, work stroke and exhaust stroke, and the engine brake utilizes the resistance generated by the compression stroke of the engine to slow down the vehicle speed.

[0003] The engine brake generally includes a rocker arm, and the rocker arm usually adopts a hydraulic locking mechanism to transmit valve lift through oil pressure compression, and since the oil has a certain compressibility, the lift transmission process is prone to cause lift fluctuation. SUMMARY

[0004] The utility model provides a kind of rocker arm structure and engine, solve the problem that current oil pressure transmission valve lift is prone to fluctuation.

[0005] The embodiment of the utility model can be realized as follows:

[0006] The embodiment of the utility model provides a kind of rocker arm structure, it includes:

[0007] valve side half rocker arm;

[0008] roller side half rocker arm, roller side half rocker arm and valve side half rocker arm are connected to rocker arm shaft;

[0009] ejector rod, ejector rod is set in roller side half rocker arm, and ejector rod can be moved to realize valve side half rocker arm and roller side half rocker arm hard connection or inaction connection.

[0010] Optionally, roller side half rocker arm is provided with containing hole, one end of containing hole penetrates roller side half rocker arm, and ejector rod is contained in containing hole and can move along containing hole.

[0011] Optionally, both ends of containing hole penetrate roller side half rocker arm, and one end of containing hole is connected with screw plug, and ejector rod can extend or retract along the other end of containing hole.

[0012] Optionally, second elastic member for pushing ejector rod to move is further provided in containing hole, the upper end of second elastic member is connected with ejector rod, and the lower end of second elastic member is connected with screw plug.

[0013] Optionally, containing hole has converging mouth, and ejector rod includes large diameter section and small diameter section, and step surface is formed between large diameter section and small diameter section, large diameter section is located in containing hole and is limited in the converging mouth of containing hole through step surface, and the outer wall of large diameter section is closely connected with the hole wall of containing hole;The outer wall of small diameter section is closely connected with the side wall of the converging mouth of containing hole.

[0014] Optionally, the stepped surface, the small-diameter section and the hole wall of the accommodating hole jointly form a jacking cavity, and the jacking cavity is used for accommodating gas or liquid to move the ejector rod.

[0015] Optionally, the rocker shaft is provided with a first oil passage and a second oil passage, the first oil passage and the second oil passage are communicated, the roller-side half rocker is provided with a third oil passage, one end of the third oil passage is communicated with the second oil passage, and the other end of the third oil passage is communicated with the jacking cavity.

[0016] Optionally, the valve-side half rocker is provided with an abutting block, and the abutting block is connected with the ejector rod.

[0017] The embodiment of the utility model further provides an engine, including cam and above-mentioned rocker structure, the cam includes lift convex, and the cam is connected with roller-side half rocker.

[0018] Optionally, the engine further includes a roller, the roller is connected to the roller-side half rocker, and the roller is connected to the cam.

[0019] The embodiment of the utility model has the advantages of:

[0020] The rocker structure includes a valve-side half rocker, a roller-side half rocker and an ejector rod, the roller-side half rocker and the valve-side half rocker are connected to a rocker shaft, the ejector rod is arranged on the roller-side half rocker, and the ejector rod is movable, so that the valve-side half rocker and the roller-side half rocker are hard connected or lost motion connected.When the rocker structure is in a normal working state, the valve-side half rocker and the roller-side half rocker are hard connected, the roller-side half rocker can transmit lift movement to the valve-side half rocker by swinging, and the valve-side half rocker normally opens an exhaust valve during valve lift; when the rocker structure is in a lost motion working state, the valve-side half rocker and the roller-side half rocker are lost motion connected, the roller-side half rocker cannot transmit lift movement to the valve-side half rocker by swinging, and the lost motion function is realized. Compared with the current oil pressure transmission of valve lift, the rocker structure of the embodiment of the utility model adopts the ejector rod transmission, and the valve lift transmission is stable and has no fluctuation.

[0021] The engine includes the above-mentioned rocker structure, and has all the functions of the above-mentioned rocker structure. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as limiting the scope, and for those skilled in the art, other related drawings can be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 It is a top view schematic diagram of the rocker structure provided in the embodiment of the utility model;

[0024] Figure 2 For Figure 1 A-A cross-sectional structure schematic diagram in the middle of the embodiment of the utility model;

[0025] Figure 3 For the structure schematic diagram of the rocker structure in the lost state provided in the embodiment of the utility model;

[0026] Figure 4 For the structure schematic diagram of the valve side half rocker provided in the embodiment of the utility model;

[0027] Figure 5 For the structure schematic diagram of the roller side half rocker provided in the embodiment of the utility model.

[0028] Icon: 1 - valve side half rocker; 2 - roller side half rocker; 3 - adjusting screw; 4 - nut; 5 - socket; 6 - exhaust valve; 7 - first elastic member; 8 - jacking rod; 9 - second elastic member; 10 - screw plug; 11 - rocker shaft; 12 - first oil passage; 13 - second oil passage; 14 - third oil passage; 15 - pin shaft; 16 - roller; 17 - cam; 18 - lift projection; 19 - pressing cavity. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the utility model.

[0031] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0032] In the description of the utility model, it needs to be explained that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0033] In addition, if the terms "first", "second" and the like are used only to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] The term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0035] Unless otherwise expressly specified and limited, the terms "provide", "connect" and the like should be broadly understood, for example, "connect" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0036] It should be noted that the features in the embodiments of the utility model can be combined with each other without conflict.

[0037] The engine brake generally comprises a rocker arm, and the rocker arm usually adopts a hydraulic locking mechanism to transmit valve lift through oil pressure compression, because oil has a certain compressibility, the lift fluctuation is easily caused in the lift transmission process.

[0038] Based on the above problems, the rocker arm structure and the engine provided in the embodiments of the utility model can solve the above problems, and the rocker arm structure will be described in detail.

[0039] Please refer to Figures 1 to 5The rocker arm structure comprises a valve-side half rocker arm 1, a roller-side half rocker arm 2 and a top rod 8, the roller-side half rocker arm 2 and the valve-side half rocker arm 1 are connected to a rocker arm shaft 11, the top rod 8 is arranged on the roller-side half rocker arm 2, and the top rod 8 can move, so that the valve-side half rocker arm 1 and the roller-side half rocker arm 2 are hard connected or lost motion connected. The lost motion connection means that the valve-side half rocker arm 1 and the roller-side half rocker arm 2 cannot transmit the lift motion.

[0040] When in a normal working state, the valve-side half rocker arm 1 and the roller-side half rocker arm 2 are hard connected through the top rod 8, the roller-side half rocker arm 2 can transmit the lift motion to the valve-side half rocker arm 1 through swinging, and the valve-side half rocker arm 1 normally opens the exhaust valve 6 during the valve lift; when in a lost motion working state, the valve-side half rocker arm 1 and the roller-side half rocker arm 2 are lost motion connected, the roller-side half rocker arm 2 cannot transmit the lift motion to the valve-side half rocker arm 1 through swinging, so that the lost motion function is realized. Compared with the current oil pressure transmission of the valve lift, the rocker arm structure of the embodiment of the utility model adopts the top rod 8 transmission, the valve lift transmission is stable and has no fluctuation, and the rocker arm structure of the embodiment of the utility model is simple, the normal working state and the lost motion working state are switched quickly, simply and reliably.

[0041] In the embodiment, a through hole is formed in one end of the valve-side half rocker arm 1, an adjusting screw 3 is inserted into the through hole, one end of the adjusting screw 3 extends out of the through hole and is positioned and connected to the valve-side half rocker arm 1 through a nut 4, the other end of the adjusting screw 3 is connected with a socket 5, and the socket 5 is used for opening or blocking the exhaust valve 6. In the normal working state, the valve-side half rocker arm 1 and the roller-side half rocker arm 2 are hard connected through the top rod 8, the roller-side half rocker arm 2 transmits the lift motion to the valve-side half rocker arm 1 through the top rod 8 during the lift motion, the valve-side half rocker arm 1 moves, and the socket 5 moves, so that the exhaust valve 6 is opened. In the lost motion working state, the valve-side half rocker arm 1 and the roller-side half rocker arm 2 are lost motion connected, the roller-side half rocker arm 2 cannot transmit the lift motion to the valve-side half rocker arm 1 during the lift motion, the valve-side half rocker arm 1 does not move, and the socket 5 continues to block the exhaust valve 6.

[0042] Optionally, an abutting block is arranged on the valve-side half rocker arm 1, the abutting block is connected with the top rod 8, the top rod 8 transmits the lift motion of the roller-side half rocker arm 2 to the abutting block, and the abutting block is fixed on the valve-side half rocker arm 1 or is directly integrated with the valve-side half rocker arm 1.

[0043] In the embodiment, the roller-side half rocker arm 2 is provided with a containing hole, the containing hole is close to the abutting block, the top rod 8 is contained in the containing hole and can move along the containing hole. When the top rod 8 is connected with the abutting block, the valve-side half rocker arm 1 and the roller-side half rocker arm 2 are hard connected.

[0044] The axial direction of the accommodating hole is the moving direction of the ejector rod 8, and the moving direction of the socket 5 on the valve side half rocker arm 1 is perpendicular to the moving direction of the ejector rod 8, so that the ejector rod 8 can not fluctuate when transmitting the lift movement of the roller side half rocker arm 2, and the stability of the lift movement transmission is ensured.

[0045] Optionally, one end of the accommodating hole penetrates the roller side half rocker arm 2, and the other end is located inside the roller side half rocker arm 2.

[0046] Optionally, both ends of the accommodating hole penetrate the roller side half rocker arm 2, and the one end of the accommodating hole is connected with the screw plug 10, and the ejector rod 8 can extend or retract from the other end of the accommodating hole, and the ejector rod 8 is connected with the abutting block when extending, and the ejector rod 8 is separated from the abutting block when retracting.

[0047] In the embodiment, the second elastic member 9 for pushing the ejector rod 8 to move is further arranged inside the accommodating hole, the upper end of the second elastic member 9 is connected with the ejector rod 8, and the lower end of the second elastic member 9 is connected with the screw plug 10 or the bottom wall of the accommodating hole.

[0048] Specifically, the ejector rod 8 includes a large-diameter section and a small-diameter section, and a step surface is formed between the large-diameter section and the small-diameter section. One end of the accommodating hole has a converging opening, the large-diameter section is located inside the accommodating hole and is limited in the converging opening of the accommodating hole through the step surface, so as to limit the moving distance of the ejector rod 8 and ensure that the ejector rod 8 will not be separated from the accommodating hole. The outer wall of the large-diameter section is closely connected with the hole wall of the accommodating hole, and the outer wall of the small-diameter section is closely connected with the side wall of the converging opening of the accommodating hole. The step surface, the small-diameter section and the hole wall of the accommodating hole jointly form a jacking cavity 19, and the jacking cavity 19 is used for accommodating gas or liquid to push the ejector rod 8 to move; for example, high-pressure oil liquid is injected into the jacking cavity 19, the high-pressure oil liquid extrudes and moves the ejector rod 8 to the side of the second elastic member 9, the second elastic member 9 is compressed, the ejector rod 8 is separated from the abutting block, and is in a lost motion working state, when the high-pressure oil liquid in the jacking cavity 19 flows out, the ejector rod 8 is reset under the action of the resilience of the second elastic member 9, and is connected with the abutting block again.

[0049] In the embodiment, the rocker shaft 11 is provided with a first oil channel 12 and a second oil channel 13, the first oil channel 12 is distributed along the axial direction of the rocker shaft 11, the second oil channel 13 is distributed along the radial direction of the rocker shaft 11, the first oil channel 12 and the second oil channel 13 are communicated, and the end of the second oil channel 13 penetrates the outer wall surface of the rocker shaft 11. The roller side half rocker arm 2 is provided with a third oil channel 14, one end of the third oil channel 14 is communicated with the second oil channel 13, and the other end of the third oil channel 14 is communicated with the jacking cavity 19, so that the oil liquid is sequentially injected into the jacking cavity 19 through the first oil channel 12, the second oil channel 13 and the third oil channel 14, and the lost motion working is realized.

[0050] Optionally, the electromagnetic valve is arranged on the first oil channel 12 or the second oil channel 13, and the electromagnetic valve is used for adjusting the size of the oil liquid pressure and controlling the on-off of the oil liquid path.

[0051] In the embodiment, the first elastic member 7 is further connected between the valve-side half rocker arm 1 and the roller-side half rocker arm 2, so that the positions of the valve-side half rocker arm 1 and the roller-side half rocker arm 2 are relatively stable.

[0052] In the embodiment, the first elastic member 7 and the second elastic member 9 are both springs.

[0053] The rocker arm structure of the embodiment of the utility model adopts the driving of the ejector rod 8, the valve lift transmission is stable and without fluctuation, and the normal working state and the inoperative working state are switched quickly, simply and reliably.

[0054] The embodiment of the utility model further provides an engine, which comprises a cam 17, a roller 16 and a rocker arm structure.

[0055] The roller 16 is connected to the roller-side half rocker arm 2 on the side far away from the ejector rod 8 through the pin shaft 15, and the roller 16 is connected with the cam 17. The cam 17 comprises a lift protrusion 18, when the cam 17 rotates to the position where the lift protrusion 18 is connected with the roller 16, the roller-side half rocker arm 2 moves to the side of the ejector rod 8; if in the normal working state, the lift movement of the roller-side half rocker arm 2 is transmitted to the valve-side half rocker arm 1, and the valve-side half rocker arm 1 opens the exhaust valve 6; if in the inoperative working state, the lift movement of the roller-side half rocker arm 2 cannot be transmitted to the valve-side half rocker arm 1, and the exhaust valve 6 is still blocked.

[0056] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A rocker arm structure characterized by comprising: The application relates to a rocker arm structure, which comprises: a valve-side half rocker arm (1); a roller-side half rocker arm (2) connected to the valve-side half rocker arm (1) on a rocker shaft (11); a top rod (8) arranged on the roller-side half rocker arm (2) and capable of moving to realize hard connection or lost motion connection of the valve-side half rocker arm (1) and the roller-side half rocker arm (2); the roller-side half rocker arm (2) is provided with a containing hole, one end of the containing hole penetrates through the roller-side half rocker arm (2), the top rod (8) is contained in the containing hole and is capable of moving along the containing hole; the containing hole has a converging opening, the top rod (8) comprises a large-diameter section and a small-diameter section, a step surface is formed between the large-diameter section and the small-diameter section, the large-diameter section is located in the containing hole and is limited in the converging opening of the containing hole through the step surface, and the outer wall of the large-diameter section is in close contact with the hole wall of the containing hole; the outer wall of the small-diameter section is in close contact with the side wall of the converging opening of the containing hole.

2. The rocker structure of claim 1, wherein Both ends of the containing hole penetrate through the roller-side half rocker arm (2), one end of the containing hole is connected with a screw plug (10), and the top rod (8) can extend out or retract from the other end of the containing hole.

3. The rocker structure of claim 2, wherein The containing hole is further provided with a second elastic member (9) for pushing the top rod (8) to move, the upper end of the second elastic member (9) is in contact with the top rod (8), and the lower end of the second elastic member (9) is in contact with the screw plug (10).

4. The rocker structure of claim 1, wherein The step surface, the small-diameter section and the hole wall of the containing hole jointly form a top pressing cavity (19) for containing gas or liquid to push the top rod (8) to move.

5. The rocker structure of claim 4, wherein The rocker shaft (11) is provided with a first oil channel (12) and a second oil channel (13), the first oil channel (12) and the second oil channel (13) are communicated, the roller-side half rocker arm (2) is provided with a third oil channel (14), one end of the third oil channel (14) is communicated with the second oil channel (13), and the other end of the third oil channel (14) is communicated with the top pressing cavity (19).

6. The rocker structure according to any one of claims 1 to 5, characterized in that, The valve-side half rocker arm (1) is provided with an abutting block in contact with the top rod (8).

7. An engine characterized by, The application further relates to a cam (17) and the rocker arm structure as claimed in any one of claims 1 to 6; the cam (17) comprises a lift projection (18), and the cam (17) is in contact with the roller-side half rocker arm (2).

8. The engine of claim 7, wherein The engine further comprises a roller (16) connected to the roller-side half rocker arm (2), and the roller (16) is in contact with the cam (17).

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