Rocking arm mechanism and engine system

Abstract

The present invention relates to the technical field of engines, and particularly relates to a rocker arm mechanism and an engine system. The rocker arm mechanism includes a rocker arm body, a cam, and a braking component. One end of the rocker arm body abuts against the cam, and the braking component is arranged at the other end of the rocker arm body. The braking component includes a fixed rod and a braking piston, and a first reserved gap is provided between the fixed rod and the braking piston. A braking valve and a reset valve are arranged on the rocker arm body, and a first lubricating oil passage and a second lubricating oil passage are communicated between the braking valve and the reset valve. The braking valve can close or open the first lubricating oil passage, and the reset valve can close or open the second lubricating oil passage. A third lubricating oil passage is communicated between the reset valve and the braking component; the cam includes a cam body, an exhaust projection, and a braking projection. The exhaust projection and the braking projection are arranged at intervals along the circumferential direction of the cam body, the maximum lift of the exhaust projection is greater than the first reserved gap, and the maximum lift of the braking projection is less than the first reserved gap.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and particularly to a rocker arm mechanism and an engine system. Background Art

[0002] When a vehicle passes through a downhill section, stepping on the brake for a long time will cause the brake to overheat, which will affect the brake life over time. In the prior art, engine braking technology has been adopted to assist braking to reduce damage to the brake. Currently, there is a rocker arm mechanism that realizes the switching between normal exhaust and auxiliary braking of the engine by additionally increasing a cam switching device, and the structure of this rocker arm mechanism is complex. Summary of the Invention

[0003] The purpose of the present invention is to provide a rocker arm mechanism and an engine system to solve the technical problem of the complex structure of the rocker arm mechanism in the prior art.

[0004] The present invention provides a rocker arm mechanism, including a rocker arm body, a cam, and a braking assembly. One end of the rocker arm body abuts against the cam, and the braking assembly is arranged at the other end of the rocker arm body. The braking assembly includes a fixed rod and a braking piston. A first reserved gap is provided between the fixed rod and the braking piston. A braking valve and a reset valve are arranged on the rocker arm body. A first lubricating oil passage and a second lubricating oil passage are connected in parallel between the braking valve and the reset valve. The braking valve can close or open the first lubricating oil passage, and the reset valve can close or open the second lubricating oil passage. A third lubricating oil passage is connected between the reset valve and the braking assembly; The cam includes a cam body, an exhaust protrusion, and a braking protrusion. The exhaust protrusion and the braking protrusion are arranged at intervals along the circumferential direction of the cam body. The maximum lift of the exhaust protrusion is greater than the first reserved gap, and the maximum lift of the braking protrusion is less than the first reserved gap.

[0005] Further, a braking oil passage for communicating with an external pressure oil supply device is arranged on the rocker arm body. The braking oil passage is connected to the braking valve to supply pressure oil to the braking valve. Under the action of the pressure oil, the braking valve opens the braking oil passage and closes the first lubricating oil passage.

[0006] Further, the braking valve includes a braking valve cavity, and a piston and a piston return member both arranged in the braking valve cavity; The top of the braking valve cavity is connected to the braking oil passage, and the middle of the braking valve cavity is connected to the first lubricating oil passage and the second lubricating oil passage;

[0007] The piston return member is connected between the bottom of the braking valve cavity and the bottom of the piston. When the braking valve is in a free state, the piston return member makes the top of the piston abut against the top of the braking valve cavity, and a second reserved gap is provided between the bottom of the piston and the bottom of the braking valve cavity.

[0008] Further, an annular groove is provided in the middle of the piston. An oil inlet for lubricating oil to enter is provided in the middle of one side of the brake valve cavity. A first lubricating oil outlet communicating with the first lubricating oil passage and a second lubricating oil outlet communicating with the second lubricating oil passage are provided in the middle of the other side of the brake valve cavity. The oil inlet can communicate with the first lubricating oil outlet and / or the second lubricating oil outlet through the annular groove.

[0009] Further, a chamfer is provided at the top end of the piston.

[0010] Further, the reset valve includes a first lubricating oil cavity, a second lubricating oil cavity and a valve core that communicate with each other. The first lubricating oil cavity communicates with both the first lubricating oil passage and the third lubricating oil passage. The second lubricating oil cavity communicates with the second lubricating oil passage. The valve core can close the communication between the first lubricating oil cavity and the second lubricating oil cavity to close the second lubricating oil passage.

[0011] Further, both the first lubricating oil cavity and the second lubricating oil cavity are provided on the rocker arm body, and the first lubricating oil cavity penetrates through the top of the rocker arm body. The reset valve includes a plugging member, and the plugging member is provided at the top of the first lubricating oil cavity to plug the top of the first lubricating oil cavity.

[0012] Further, the valve core includes a reset pin, a valve rod and a valve ball. The reset pin is fixedly provided outside the rocker arm body. The diameter of the first lubricating oil cavity is larger than that of the second lubricating oil cavity;

[0013] One end of the valve ball is connected to the valve rod and is clamped at the communication between the first lubricating oil cavity and the second lubricating oil cavity. The other end of the valve rod extends outside the second lubricating oil cavity. Thus, when the rocker arm body abuts against the exhaust protrusion, the valve rod abuts against the reset pin.

[0014] Further, the reset valve is provided between the brake valve and the brake assembly.

[0015] The present invention provides an engine system including the above-mentioned rocker arm mechanism.

[0016] Compared with the prior art, the beneficial effects of the present invention mainly lie in:

[0017] The rocker arm mechanism provided by the present invention simultaneously provides exhaust protrusions and brake protrusions with different lift amounts on the same cam body. Through the cooperative work of the brake valve and the reset valve, it can not only realize the normal operation of the engine, but also realize the auxiliary braking operation of the engine. The rocker arm mechanism provided by the present invention has a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0019] Figure 1 is a schematic structural diagram of a rocker arm mechanism according to an embodiment of the present invention in a normal operating state of the engine;

[0020] Figure 2 is Figure 1 a schematic structural diagram of the rocker arm mechanism shown in a engine braking state;

[0021] Figure 3 is Figure 1 a schematic structural diagram of a braking valve in the rocker arm mechanism shown;

[0022] Figure 4 is Figure 1 a schematic structural diagram of a reset valve in the rocker arm mechanism shown.

[0023] In the figure: 10 - rocker arm body; 20 - rocker arm shaft; 30 - cam; 40 - braking component; 50 - braking valve; 60 - reset valve; 70 - exhaust valve bridge; 31 - cam body; 32 - exhaust protrusion; 33 - braking protrusion; 41 - braking cavity; 42 - nut; 43 - adjusting bolt; 44 - braking piston; 45 - braking return member; 51 - braking valve cavity, 52 - piston; 53 - piston return member; 54 - plug; 55 - annular groove; 56 - oil inlet; 57 - first lubricating oil outlet; 58 - second lubricating oil outlet; 61 - first lubricating oil cavity; 62 - second lubricating oil cavity; 63 - valve stem; 64 - valve ball; 65 - reset pin; 01 - first lubricating oil passage; 02 - second lubricating oil passage; 03 - third lubricating oil passage; 04 - braking oil passage; 05 - first reserved gap; 06 - second reserved gap. Specific embodiments

[0024] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0025] Such as Figures 1 to 4As shown in the figure, the present invention provides a rocker arm mechanism, which includes a rocker arm body 10, a rocker arm shaft 20, a cam 30 and a braking assembly 40. The rocker arm body 10 is rotatably connected to the rocker arm shaft 20. One end of the rocker arm body 10 abuts against the cam 30. The braking assembly 40 is arranged at the other end of the rocker arm shaft 20. A braking valve 50 and a reset valve 60 are provided on the rocker arm body 10. A first lubricating oil passage 01 and a second lubricating oil passage 02 are communicated between the braking valve 50 and the reset valve 60. The braking valve 50 can close or open the first lubricating oil passage 01. The reset valve 60 can close or open the second lubricating oil passage 02. A third lubricating oil passage 03 is communicated between the reset valve 60 and the braking assembly. The cam 30 includes a cam body 31, an exhaust protrusion 32 and a braking protrusion 33. The exhaust protrusion 32 and the braking protrusion 33 are arranged at intervals along the circumferential direction of the cam body 31. The maximum lift of the exhaust protrusion 32 is greater than the maximum lift of the braking protrusion 33.

[0026] In this embodiment, the braking piston 44 in the braking assembly 40 is used to connect with the exhaust valve bridge 70 (or the exhaust valve) so as to be able to push the exhaust valve bridge 70 (or the exhaust valve), thereby opening the valve to complete the exhaust. The braking valve 50 can be communicated with an external lubricating oil supply device. The lubricating oil entering the braking valve 50 can enter the first lubricating oil passage 01 when the braking valve 50 opens the first lubricating oil passage 01, then enter the reset valve 60, and then enter the braking assembly 40 through the third lubricating oil passage 03. The lubricating oil entering the braking valve 50 can enter the reset valve 60 through the second lubricating oil passage 02 and enter the braking assembly 40 through the third lubricating oil passage 03 when the reset valve 60 opens the second lubricating oil passage 02.

[0027] Under the normal working state of the engine:

[0028] During the whole process of the rocker arm body 10 abutting against the cam 30, the braking valve 50 always opens the first lubricating oil passage 01. Then the lubricating oil entering the braking valve 50 enters the reset valve 60 through the first lubricating oil passage 01, and then enters the braking assembly 40 through the third lubricating oil passage 03, so as to always lubricate each component of the braking assembly 40.

[0029] When the rocker arm body 10 abuts against the braking protrusion 33, since the maximum lift of the braking protrusion 33 is smaller than the first reserved gap between the fixed rod and the braking piston 44 in the braking assembly 40, the maximum lift of the braking protrusion 33 is not enough to make the fixed rod abut against the piston, that is, the first reserved gap cannot be eliminated, so it is not enough to push the braking piston 44 to move further, and thus not enough to push open the valve for exhaust.

[0030] During the process of the rocker arm body 10 abutting against the exhaust projection 32, the control reset valve 60 opens the second lubricating oil passage 02, so that the second lubricating oil passage 02 is communicated with the third lubricating oil passage 03. The lubricating oil in the brake valve 50 can enter the brake assembly 40 through the second lubricating oil passage 02 and the third lubricating oil passage 03. At this time, the maximum lift of the exhaust projection 32 is greater than the first reserved gap, so that the fixed rod can abut against the piston, that is, the first reserved gap is eliminated (at the same time, the redundant lubricating oil in the brake assembly 40 is extruded, such as extruded into the third lubricating oil passage 03), so that the brake piston can be pushed to continue to move, and then the valve can be pushed open to exhaust, thus completing the normal exhaust process. When the rocker arm body 10 finishes passing the exhaust projection 32, the brake piston 44 resets, and a first reserved gap 05 is newly formed between the brake piston 44 and the fixed rod, and so on in a cycle.

[0031] In the state of engine auxiliary braking:

[0032] The control brake valve 50 always closes the first lubricating oil passage 01. Then, after the rocker arm body 10 finishes passing the exhaust projection 32 and before starting to pass the brake projection 33, the lubricating oil in the first lubricating oil passage 01, the reset valve 60, the third lubricating oil passage 03 and the brake assembly 40 is sealed. The brake assembly 40 is filled with lubricating oil, and the lubricating oil cannot enter or exit. At this time, the lubricating oil can be regarded as a hydraulic rigid connection, and the lubricating oil plays a role in transmitting force. Since the lubricating oil cannot enter or exit, the first reserved gap 05 between the fixed rod and the brake piston 44 remains unchanged. When the rocker arm body 10 abuts against the brake projection 33, the lift of the brake projection 33 is the movement amount of the brake piston 44 pushing the exhaust valve bridge 70 (or the exhaust valve), so that the valve can be opened in advance for exhaust, thereby realizing auxiliary braking.

[0033] The cam 30 continues to rotate, and the rocker arm body 10 begins to abut against the exhaust projection 32. During this process, the control reset valve 60 opens the second lubricating oil passage 02. At this time, the brake valve 50, the second lubricating oil passage 02, the reset valve 60, the third lubricating oil passage 03 and the brake assembly 40 are communicated with each other. The lubricating oil in the brake assembly 40 can enter and exit. The first reserved gap between the brake piston 44 and the fixed rod can decrease with the increase of the lift of the exhaust projection 32 until the fixed rod abuts against the brake piston 44, pushing the brake piston 44 to push the exhaust valve bridge 70 (or the exhaust valve) to move, and finally realizing normal exhaust; subsequently, the exhaust valve bridge 70 (or the exhaust valve) resets, the brake piston 44 resets, and the lubricating oil is replenished into the brake assembly 40 again. When the rocker arm body 10 finishes passing the exhaust projection 32, there is a first reserved gap between the brake piston 44 and the fixed rod, and the brake assembly 40 is filled with lubricating oil, waiting for the next early exhaust.

[0034] The rocker arm mechanism provided in this embodiment can realize both the normal operation of the engine and the auxiliary braking operation of the engine by simultaneously arranging exhaust protrusions 32 and braking protrusions 33 with different lift amounts on the same cam body 31 and through the coordinated operation of the braking valve 50 and the reset valve 60. It has a simple structure, easy control, and low cost. The braking valve 50 and the reset valve 60 in this embodiment are independently arranged, and their components do not affect each other, thus avoiding problems such as collision or jamming during braking.

[0035] Specifically, the rocker arm mechanism further includes a rocker arm shaft 20. The rocker arm body 10 is rotatably connected to the rocker arm shaft 20 to achieve swinging, and the rocker arm shaft 20 is fixed within the engine system. The rocker arm body 10 abuts against the cam 30 through rollers, thereby reducing the resistance of the relative sliding between the rocker arm body 10 and the cam 30 and reducing wear.

[0036] Specifically, the braking assembly 40 includes a braking chamber 41, a fixing rod, a braking piston 44, and a braking reset member 45 (such as a spring); the fixing rod is an adjusting bolt 43. The braking chamber 41 is arranged at one end of the rocker arm body 10 away from the cam 30. The braking chamber 41 penetrates through the rocker arm body 10. One end of the adjusting bolt 43 is fixed to the top of the braking chamber 41 through a nut 42, and the other end of the adjusting bolt 43 extends into the braking chamber 41. The braking piston 44 is arranged within the braking chamber 41 and is located below the adjusting bolt 43. One end of the braking reset member 45 is connected to the top of the braking chamber 41, and the other end of the braking reset member is connected to the braking piston 44. In the free state of the braking assembly, the braking reset member 45 can make a first reserved gap 05 exist between the bottom of the adjusting bolt 43 and the braking piston 44, and the braking piston 44 is used to connect with the exhaust valve bridge 70 (or the exhaust valve).

[0037] It should be noted that lubricating oil channels can also be arranged at other positions on the rocker arm shaft 20 or the rocker arm body 10 to supply lubricating oil to the components that need lubrication.

[0038] Among them, the braking valve 50 preferably keeps the second lubricating oil channel 02 always open, and the opening or closing of the second lubricating oil channel 02 can be controlled by the inflation valve, so that the structure is simple.

[0039] On the basis of the above embodiment, further, the braking valve 50 can be electrically controlled, such as being controlled by a motor or electromagnetic control, etc.

[0040] As an alternative solution, as Figure 3 shown, a braking oil channel 04 for communicating with an external pressure oil supply device is provided on the rocker arm body 10. The braking oil channel 04 is communicated with the braking valve 50 to convey pressure oil to the braking valve 50. The braking valve 50 opens the braking oil channel 04 under the action of the pressure oil and closes the first lubricating oil channel 01.

[0041] In this embodiment, the brake valve 50 is a hydraulic control valve. By introducing pressure oil into the brake valve 50, under the action of the pressure oil, the brake valve 50 fully opens the brake oil passage 04 and fully closes the first lubricating oil passage 01 at the same time. When the pressure oil is removed, the brake valve 50 opens the first lubricating oil passage 01 again and closes the brake oil passage 04 at the same time. The brake valve 50 provided in this embodiment can realize the opening and closing of the second lubricating oil passage 02 through hydraulic oil and its own mechanical structure, with a simple structure and reliable control.

[0042] Among them, the structure of the brake valve 50 that can realize opening and closing through hydraulic pressure can be various. For example: the brake valve 50 includes a valve cavity, a tension spring and a valve stem. The upper part of the valve cavity is communicated with the brake oil passage 04, the middle part of the valve cavity is communicated with the first lubricating oil passage 01 and the second lubricating oil passage 02. One end of the tension spring is connected to the top of the valve cavity, and the other end is connected to the valve stem. When pressure oil enters the valve cavity, the pressure oil pushes the valve stem to move towards the bottom of the valve cavity, thereby opening the brake oil passage 04 and closing the first lubricating oil passage 01 at the same time.

[0043] As an alternative solution: as Figure 3 shown, the brake valve 50 includes a brake valve cavity 51 and a piston 52 and a piston return member 53 (such as a spring, or a structure made of an elastic material, etc.) both arranged in the brake valve cavity 51; the top of the brake valve cavity 51 is communicated with the brake oil passage 04, and the middle part of the brake valve cavity 51 is communicated with the first lubricating oil passage 01 and the second lubricating oil passage 02; the piston return member 53 is connected between the bottom of the installation cavity of the brake valve 50 and the bottom of the piston 52. In the free state, the piston return member 53 makes the top of the piston 52 abut against the top of the brake valve cavity 51, and there is a second reserved gap 06 between the bottom of the piston 52 and the bottom of the brake valve cavity.

[0044] In this embodiment, the top of the brake valve 50 is communicated with the brake oil passage 04. When the engine is in normal working condition, the piston return member 53 makes the top of the piston 52 abut against the top of the brake cavity 41, so that the brake oil passage 04 can be closed. The second reserved gap is the amount of movement of the piston 52 towards the bottom of the brake valve cavity 51 by the pressure oil. While eliminating the second reserved gap, the brake oil passage 04 is opened and the first lubricating oil passage 01 is closed. The brake valve 50 with this structure is more compact.

[0045] Among them, the first lubricating oil passage 01 can be below the second lubricating oil passage 02. At this time, it should be noted that when the piston closes the first lubricating oil passage 01, avoid closing the second lubricating oil passage 02.

[0046] Optionally, the first lubricating oil passage 01 is located above the second lubricating oil passage 02, so that the oil passage structure is clear and regular, which is convenient for processing.

[0047] Specifically, the brake valve chamber 51 penetrates through the top of the rocker arm body 10, and a plug 54 is provided at the top of the brake valve chamber 51 to seal the brake valve chamber 51, which is convenient for installation.

[0048] As Figure 3 shown, on the basis of the above embodiment, further, an annular groove 55 is provided in the middle of the piston. In the middle of one side of the brake valve chamber 51, an oil inlet 56 for lubricating oil to enter is provided. In the middle of the other side of the brake valve chamber 51, a first lubricating oil outlet 57 communicated with the first lubricating oil passage 01 and a second lubricating oil outlet 58 communicated with the second lubricating oil passage 02 are provided. The oil inlet can be communicated with the first lubricating oil outlet 57 and the second lubricating oil outlet 58 respectively through the annular groove 55.

[0049] In this embodiment, by providing an annular groove in the middle of the piston, the communication between the oil inlet 56 and the first lubricating oil outlet 57 and the second lubricating oil outlet is realized. Compared with providing a communication hole on the piston, when the oil inlet 56, the communication hole, and the first lubricating oil outlet 57 (or the second lubricating oil outlet 58) are aligned, the oil inlet 56 and the first lubricating oil outlet 57 (or the second lubricating oil outlet 58) are communicated. The structure of the piston provided in this embodiment is simple and convenient for processing and manufacturing.

[0050] As Figure 3 shown, on the basis of the above embodiment, further, a chamfer is provided at one end of the brake oil inlet at the top of the piston. In this embodiment, by providing a chamfer at the top of the piston, it is convenient for the pressure oil to enter the brake valve chamber 51, thereby pushing the piston to move.

[0051] As Figure 1 , Figure 2 and Figure 4 shown, on the basis of the above embodiment, further, the reset valve 60 includes a first lubricating oil chamber 61, a second lubricating oil chamber 62 and a valve core that are communicated with each other. The first lubricating oil chamber 61 is communicated with the first lubricating oil passage 01, the second lubricating oil chamber 62 is communicated with the second lubricating oil passage 02, and the valve core can close the communication between the first lubricating oil chamber 61 and the second lubricating oil chamber 62 to close the second lubricating oil passage 02.

[0052] In this embodiment, when the valve core opens the communication between the first lubricating oil chamber 61 and the second lubricating oil chamber 62, the communication between the second lubricating oil passage 02 and the third lubricating oil passage 03 is realized. At this time, the second lubricating oil passage 02 is in an open state. When the valve core closes the communication between the first lubricating oil chamber 61 and the second lubricating oil chamber 62, the disconnection between the second lubricating oil passage 02 and the third lubricating oil passage 03 is realized. At this time, the second lubricating oil passage 02 is in a closed state. In this embodiment, the opening or closing of the second lubricating oil passage 02 is realized by opening or closing the communication between the first lubricating oil chamber 61 and the second lubricating oil chamber 62, and the structure is simple. Further, both the first lubricating oil chamber 61 and the second lubricating oil chamber 62 are arranged on the rocker arm body 10, and the first lubricating oil chamber 61 penetrates through the top of the rocker arm body 10. The reset valve 60 includes a plugging member, and the plugging member is arranged at the top of the first lubricating oil chamber 61 to plug the top of the first lubricating oil chamber 61. In this embodiment, the first lubricating oil chamber 61 and the second lubricating oil chamber 62 are directly arranged on the rocker arm body 10, so that the number of components is small and the installation is convenient.

[0053] Among them, the opening and closing settings of the communication between the valve core and the first lubricating oil chamber 61 and the second lubricating oil chamber 62 can be realized by electric control. However, elements need to be set to detect whether the rocker arm body 10 contacts the exhaust protrusion and the rotation state of the cam 30, and it is necessary to ensure that the reset valve 60 opens the second lubricating oil passage 02 during the contact process between the rocker arm body 10 and the exhaust protrusion 32.

[0054] As an alternative solution, as Figure 4 shown, the valve core includes a reset pin 65, a valve stem 63 and a valve ball 64. The reset pin 65 is fixedly arranged outside the rocker arm body 10, and the diameter of the first lubricating oil chamber 61 is larger than that of the second lubricating oil chamber 62; one end of the valve ball 64 is connected to the valve stem 63 and is clamped at the communication between the first lubricating oil chamber 61 and the second lubricating oil chamber 62, and the other end of the valve stem 63 extends outside the second lubricating oil chamber 62. Thus, during the contact process between the rocker arm body 10 and the exhaust protrusion 32, the valve stem 63 contacts the reset pin 65.

[0055] In this embodiment, the diameter of the first lubricating oil chamber 61 is larger than that of the second lubricating oil chamber 62. Then, a step is formed at the connection between the two, and the valve ball 64 is stuck at this step, isolating the first lubricating oil chamber 61 from the second lubricating oil chamber 62, thereby cutting off the connecting pipeline between the second lubricating oil passage 02 and the third lubricating oil passage 03, that is, closing the second lubricating oil passage. One end of the valve stem 63 extends outside the second lubricating oil chamber 62. During the process of the rocker arm body 10 abutting against the exhaust protrusion 32, the valve stem 63 abuts against the reset pin 65. As the lift of the exhaust protrusion continuously increases and the reset pin 65 remains stationary, the valve stem 63 will push the valve ball 64 upwards towards the top of the first lubricating oil chamber 61, thereby connecting the first lubricating oil chamber 61 and the second lubricating oil chamber 62, and thus opening the second lubricating oil passage 02. In this embodiment, the opening and closing control of the second lubricating oil passage 02 is realized through the mechanical structure of the rocker arm mechanism itself, with a simple structure and accurate control.

[0056] Compared with the rocker arm mechanism provided in this embodiment, in the absence of the reset pin, the reset valve can be used as a one-way valve, that is, only when the pressure in the second lubricating oil passage can lift the valve ball, the reset valve will open. At this time, the lubricating oil flows unidirectionally from the second lubricating oil passage into the braking component; while in the case where the reset pin lifts the valve ball, the reset valve is used as an ordinary valve, and the lubricating oil in the second lubricating oil passage can flow into the braking component, and the lubricating oil in the braking component can also flow to the second lubricating oil passage, that is, the lubricating oil can flow bidirectionally in the second lubricating oil passage.

[0057] In addition, when the engine is in the process of auxiliary braking, if the control brake valve 50 always closes the first lubricating oil passage 01, then after the rocker arm body 10 has passed the exhaust protrusion 32 and before it starts to pass the braking protrusion 33, the lubricating oil route from the first lubricating oil passage 01 to the reset valve 60 and then to the braking component 40 is blocked, and the lubricating oil cannot enter or exit through this route; if the oil pressure in the second lubricating oil passage can lift the valve ball, the lubricating oil enters the braking component through the second lubricating oil passage until the oil in the braking component is full. At this time, the lubricating oil in the second lubricating oil passage cannot lift the valve ball, so the lubricating oil no longer enters or exits the braking component through this route, and the lubricating oil in the braking component can be regarded as a hydraulically rigid connection.

[0058] On the basis of the above embodiment, further, the reset valve 60 is arranged between the brake valve 50 and the braking component 40. This arrangement avoids the first lubricating oil passage 01, the second lubricating oil passage 02, and the third lubricating oil passage 03 from winding around on the rocker arm body 10, and can achieve the simplest setting of the oil passage.

[0059] The present invention provides an engine system and the above-mentioned rocker arm mechanism. It further includes an exhaust valve bridge 70 (or an exhaust valve), which is connected to the exhaust valve bridge 70 (or the exhaust valve) in the braking component 40. The engine system provided in this embodiment has a simple and compact structure, smooth braking, and reduces the collision and jamming between components.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

[0061] In addition, those skilled in the art can understand that although some of the above embodiments include certain features included in other embodiments rather than other features, the combination of features of different embodiments means being within the scope of this application and forms different embodiments. For example, any one of the claimed embodiments can be used in any combination. Additionally, the information disclosed in this background art section is only intended to deepen the understanding of the overall background art of this application and should not be regarded as an admission or any form of implication that this information constitutes the prior art already known to those skilled in the art.

Claims

1. A rocker arm mechanism, comprising: A rocker arm body, a cam, and a braking assembly. One end of the rocker arm body abuts against the cam, and the braking assembly is arranged at the other end of the rocker arm body. The braking assembly includes a fixed rod and a braking piston, and a first reserved gap is provided between the fixed rod and the braking piston. It is characterized in that, a braking valve and a reset valve are provided on the rocker arm body. A first lubricating oil passage and a second lubricating oil passage are connected in parallel between the braking valve and the reset valve. The braking valve closes or opens the first lubricating oil passage, the reset valve closes or opens the second lubricating oil passage, and a third lubricating oil passage is connected between the reset valve and the braking assembly; the cam includes a cam body, an exhaust protrusion, and a braking protrusion. The exhaust protrusion and the braking protrusion are arranged at intervals along the circumferential direction of the cam body. The maximum lift of the exhaust protrusion is greater than the width of the first reserved gap, and the maximum lift of the braking protrusion is less than the width of the first reserved gap.

2. The rocker arm mechanism according to claim 1, wherein a braking oil passage for communicating with an external pressure oil supply device is provided on the rocker arm body. The braking oil passage is communicated with the braking valve to supply pressure oil to the braking valve. Under the action of the pressure oil, the braking valve opens the braking oil passage and closes the first lubricating oil passage.

3. The rocker arm mechanism according to claim 2, characterized in that, the braking valve includes a braking valve cavity, and a piston and a piston reset member both arranged in the braking valve cavity; the top of the braking valve cavity is communicated with the braking oil passage, and the middle of the braking valve cavity is communicated with the first lubricating oil passage and the second lubricating oil passage; the piston reset member is connected between the bottom of the braking valve cavity and the bottom of the piston. When the braking valve is in a free state, the piston reset member makes the top of the piston abut against the top of the braking valve cavity, and a second reserved gap is provided between the bottom of the piston and the bottom of the braking valve cavity.

4. The rocker arm mechanism according to claim 3, characterized in that, a ring groove is provided in the middle of the piston. An oil inlet for lubricating oil to enter is provided in the middle of one side of the braking valve cavity. A first lubricating oil outlet communicated with the first lubricating oil passage and a second lubricating oil outlet communicated with the second lubricating oil passage are provided in the middle of the other side of the braking valve cavity. The oil inlet can be communicated with the first lubricating oil outlet and / or the second lubricating oil outlet through the ring groove.

5. The rocker arm mechanism according to claim 2, characterized in that, a chamfer is provided at the top end of the piston.

6. The rocker arm mechanism according to claim 2, wherein the reset valve includes a first lubricating oil cavity, a second lubricating oil cavity, and a valve core that are communicated with each other. The first lubricating oil cavity is communicated with both the first lubricating oil passage and the third lubricating oil passage. The second lubricating oil cavity is communicated with the second lubricating oil passage. The valve core can close the communication between the first lubricating oil cavity and the second lubricating oil cavity to close the second lubricating oil passage.

7. The rocker arm mechanism according to claim 6, characterized in that, both the first lubricating oil cavity and the second lubricating oil cavity are arranged on the rocker arm body, and the first lubricating oil cavity penetrates through the top of the rocker arm body. The reset valve includes a plugging member, and the plugging member is arranged at the top of the first lubricating oil cavity to plug the top of the first lubricating oil cavity.

8. The rocker arm mechanism according to claim 7, characterized in that, The spool valve includes a reset pin, a valve stem, and a valve ball. The reset pin is fixedly arranged outside the rocker arm body, and the diameter of the first lubricating oil cavity is larger than that of the second lubricating oil cavity; One end of the valve ball is connected to the valve stem and is clamped at the communication position of the first lubricating oil cavity and the second lubricating oil cavity. The other end of the valve stem extends outside the second lubricating oil cavity. Thus, when the rocker arm body abuts against the exhaust protrusion, the valve stem abuts against the reset pin.

9. The rocker arm mechanism according to claim 2, characterized in that, The reset valve is arranged between the brake valve and the brake assembly.

10. An engine system, characterized in that, Comprising: The rocker arm mechanism according to any one of claims 1-9.

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