Rocker arm brake device and vehicle

Abstract

The present application relates to the technical field of vehicle braking, and particularly relates to a rocker arm braking device and a vehicle. The rocker arm braking device comprises an exhaust reset mechanism and a braking mechanism arranged on a rocker arm and located on a side of a rocker arm shaft away from a cam. The exhaust reset mechanism comprises a cavity, an exhaust top piece, an exhaust reset one-way structure and an exhaust piston. The exhaust top piece is arranged in the cavity to separate the cavity into an upper cavity and a lower cavity. The exhaust reset one-way structure is arranged between the lower cavity and the upper cavity. The lower end of the exhaust piston is used to contact an exhaust valve bridge. The braking mechanism comprises a plugging structure, a braking piston and first and second braking cavities in communication with each other. The first braking cavity is in communication with the lower cavity, the second braking cavity is in communication with the upper cavity, the braking piston is slidingly arranged in the second braking cavity, and the plugging structure is arranged on a communication pipeline between the second braking cavity and the first braking cavity. The lower end of the braking piston can contact the exhaust valve.

Description

Technical Field

[0001] This invention relates to the field of vehicle braking technology, and in particular to a rocker arm brake device and a vehicle. Background Technology

[0002] When a vehicle is driving downhill, prolonged braking can cause the brakes to overheat, which can eventually affect their lifespan. Rocker arm braking is a technology that achieves in-cylinder braking by opening the exhaust valve earlier or later. Existing rocker arm braking devices include an exhaust structure and a reset structure to achieve normal engine exhaust and braking. The exhaust structure and reset structure are independently set on the rocker arm, making the rocker arm braking device complex in structure. Summary of the Invention

[0003] The purpose of this invention is to provide a rocker arm braking device and a vehicle, so as to solve to some extent the technical problem of low braking power of the rocker arm braking device in the prior art.

[0004] The present invention provides a rocker arm braking device including a rocker arm and a cam. The rocker arm is rotatably connected to an external component via a rocker arm shaft. One end of the rocker arm is provided with a roller, which abuts against the cam. The cam includes a base circle, an exhaust protrusion and a braking protrusion disposed on the base circle. The device also includes an exhaust reset mechanism and a braking mechanism disposed on the rocker arm on the side of the rocker arm shaft away from the cam.

[0005] The exhaust reset mechanism includes a cavity, an exhaust top member, an exhaust reset one-way structure, and an exhaust piston. The exhaust top member is disposed in the cavity to divide the cavity into an upper cavity and a lower cavity. The exhaust reset one-way structure is disposed between the lower cavity and the upper cavity to prevent fluid from flowing from the upper cavity into the lower cavity. The exhaust piston is slidably disposed in the lower cavity. The upper end of the exhaust piston can contact the exhaust top member, and the lower end of the exhaust piston is used to contact the exhaust valve bridge.

[0006] The braking mechanism includes a sealing structure, a brake piston, and a first brake chamber and a second brake chamber that are interconnected. The first brake chamber is connected to the lower cavity, and the second brake chamber is connected to the upper cavity. The brake piston is slidably disposed in the second brake chamber. The sealing structure is disposed on the connecting pipe between the second brake chamber and the first brake chamber to block the connecting pipe. The lower end of the brake piston can contact the exhaust valve. The rocker arm is provided with a main oil passage that communicates with the first brake chamber.

[0007] The rocker arm brake device provided by this invention can achieve braking and non-braking by varying the pressure of the supplied hydraulic oil. It features a simple structure, a straightforward control process, and high braking power. Furthermore, the exhaust and reset mechanism enables both normal exhaust and braking mechanism reset, integrating the exhaust and reset functions into a single cavity. This simplifies the structure of the rocker arm brake device, resulting in a compact component structure, reduced assembly requirements, and easier and more efficient installation.

[0008] Furthermore, the rocker arm braking device also includes a pressure regulating mechanism, which includes a pressure regulating chamber disposed on the rocker arm, a pressure regulating piston and a pressure regulating elastic element disposed in the pressure regulating chamber, the pressure regulating elastic element being connected between the inner wall of the pressure regulating chamber and the pressure regulating piston; the pressure regulating chamber is connected to the lower cavity, and the wall of the pressure regulating chamber is provided with a drain hole for communicating with the outside, the pressure regulating piston being able to open and block the drain hole.

[0009] Furthermore, the exhaust top component includes a vertical side top plate and a horizontal plate connected to the vertical side top plate. The horizontal plate is provided with a connecting hole connecting the lower cavity and the upper cavity. The exhaust reset one-way structure includes an exhaust sealing component and an upper exhaust elastic component. The exhaust sealing component is disposed on the upper side of the connecting hole at the connecting opening. The upper exhaust elastic component connects the top of the upper cavity and the exhaust sealing component.

[0010] Furthermore, the exhaust piston includes an exhaust piston rod and a lower exhaust elastic member; one end of the lower exhaust elastic member is connected to the lower side of the transverse plate, the other end of the exhaust elastic member is connected to the exhaust piston rod, the upper end of the exhaust piston rod can contact the exhaust top member, and the lower end of the exhaust piston rod is used to contact the exhaust valve bridge.

[0011] Furthermore, the exhaust piston includes an exhaust sliding pin, an exhaust push rod, and a lower exhaust elastic member; the exhaust sliding pin has a mounting groove with an opening facing the transverse plate, the exhaust push rod and the lower exhaust piston are disposed in the mounting groove, one end of the lower exhaust elastic member is connected to the exhaust push rod, and the other end of the lower exhaust elastic member is connected to the transverse plate; the exhaust sliding pin is slidably disposed in the lower cavity, the upper end of the exhaust sliding pin can contact the exhaust push member, and the lower end of the exhaust sliding pin is used to contact the exhaust valve bridge.

[0012] Furthermore, the exhaust piston also includes an exhaust guide sleeve and a first lifting elastic member; the top of the exhaust guide sleeve is provided with a sliding hole, and the bottom of the exhaust guide sleeve is provided with an installation port; the exhaust push rod includes an upper push rod section and a lower sliding section connected to each other; the cross-sectional area of ​​the upper push rod section is smaller than the cross-sectional area of ​​the lower sliding section; the lower sliding section is slidably disposed in the exhaust guide sleeve; the upper push rod section passes through the sliding hole; the lower sliding section is provided with a first groove opening downwards; one end of the first lifting elastic member is connected to the bottom of the first groove; the other end of the first lifting elastic member is connected to the bottom of the exhaust sliding pin; and the lower exhaust elastic member is connected to the exhaust guide sleeve.

[0013] Furthermore, the exhaust piston also includes a second lifting elastic member; the exhaust push rod is provided with a second groove opening downwards, one end of the second lifting elastic member is connected to the bottom of the second groove, and the other end of the second lifting elastic member is connected to the bottom of the exhaust sliding pin; the upper part of the exhaust sliding pin is provided with an annular groove, and the lower exhaust elastic member is connected to the bottom of the annular groove.

[0014] Furthermore, the rocker arm is provided with a first oil passage and a second oil passage; the brake piston includes an upper brake piston section and a lower brake piston section connected to each other, and the cross-sectional area of ​​the upper brake piston section is larger than that of the lower brake piston section, and the upper brake piston section abuts against the inner wall of the brake chamber; the upper brake piston section divides the brake chamber into a first brake chamber and a second brake chamber arranged from bottom to top, the second brake chamber is connected to the upper piston chamber through the first oil passage, and the second brake chamber is connected to the lower piston chamber through the second oil passage; the upper piston section is provided with a first annular groove, a central oil passage, and an oil port connected to the central oil passage; the sealing structure includes a brake sealing member and an upper brake elastic member, the brake sealing member is disposed at the oil port, and the upper brake elastic member is connected between the top of the second brake chamber and the sealing member; a lower brake elastic member is also provided in the first brake chamber, and the lower brake elastic member is connected between the lower brake piston section and the second brake chamber.

[0015] Furthermore, the sealing structure includes a sealing elastic element and a sealing piston. The sealing piston is slidably disposed within the first braking chamber, and the sealing elastic element is connected between the sealing piston and the first braking chamber. The sealing piston is provided with a second annular groove, an axially extending flow channel, and an oil hole disposed on the side wall of the sealing piston. The rocker arm is provided with an intermediate oil passage connecting the first braking chamber and the second braking chamber, and the sealing piston is capable of sealing the intermediate oil passage. The braking piston includes a braking piston rod and a braking elastic element. The braking piston rod is slidably disposed within the second braking chamber, and the braking elastic element is connected between the braking elastic element and the second braking chamber.

[0016] The present invention also provides a vehicle, including a mounting part and the above-described rocker arm braking device, wherein the rocker arm shaft is rotatably connected to the mounting part.

[0017] It should be understood that both the foregoing general description and the following detailed description are for illustrative purposes and do not necessarily limit the scope of this disclosure. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the subject matter of this disclosure. Furthermore, the specification and drawings serve to explain the principles of this disclosure. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the rocker arm braking device according to the first embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the rocker arm braking device in the non-braking state according to the second embodiment of the present invention;

[0021] Figure 3 for Figure 2 A schematic diagram of the rocker arm brake device in the braking state;

[0022] Figure 4 This is a first-view structural schematic diagram of the rocker arm braking device according to the third embodiment of the present invention;

[0023] Figure 5 for Figure 4 A schematic diagram of the rocker arm braking device from a second perspective;

[0024] Figure 6 for Figure 4The diagram shows the structure of the pressure regulating mechanism in the rocker arm brake device.

[0025] Figure 7 This is a schematic diagram of the exhaust reset mechanism in the rocker arm braking device of the first and second embodiments of the present invention;

[0026] Figure 8 This is a schematic diagram of the rocker arm braking device according to the fourth embodiment of the present invention;

[0027] Figure 9 This is a schematic diagram of the exhaust reset mechanism according to the fifth embodiment of the present invention;

[0028] Figure 10 This is a schematic diagram of the exhaust reset mechanism according to the sixth embodiment of the present invention.

[0029] Icons: 1-Rockarm; 101-Rockarm Shaft; 102-Roller; 103-Main Oil Passage; 104-First Oil Passage; 105-Second Oil Passage; 2-Cam; 201-Base Circle; 202-Brake Protrusion; 203-Exhaust Protrusion; 3-Exhaust Reset Mechanism; 301-Exhaust Top; 302-Upper Cavity; 303-Lower Cavity; 304-Exhaust Seal; 305-Upper Exhaust Elastic Component; 306-Exhaust Piston Rod; 307-Lower Exhaust Elastic Component; 308-Exhaust Sliding Pin; 309-Exhaust Top Rod; 310-Exhaust... Air guide sleeve; 311-First lifting elastic element; 312-Second lifting elastic element; 4-Brake mechanism; 401-Brake piston; 402-First brake chamber; 403-Second brake chamber; 404-Brake sealing element; 405-Upper brake elastic element; 406-Lower brake elastic element; 407-Sealing elastic element; 408-Sealing piston; 409-Intermediate oil passage; 5-Pressure regulating mechanism; 501-Pressure regulating chamber; 502-Pressure regulating piston; 503-Pressure regulating elastic element; 504-Drain hole; 7-Exhaust valve bridge; 8-Exhaust valve. Detailed Implementation

[0030] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0032] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] like Figures 1 to 10 As shown, the present invention provides a rocker arm braking device, including a rocker arm 1 and a cam 2. The rocker arm 1 is rotatably connected to an external component via a rocker arm shaft 101. One end of the rocker arm 1 is provided with a roller 102, which abuts against the cam 2. The cam 2 includes a base circle 201, an exhaust protrusion 203 and a braking protrusion 202 disposed on the base circle 201 (the height of the braking protrusion 202 is less than the height of the exhaust protrusion 203). The device also includes an exhaust reset mechanism 3 and a braking mechanism 4 disposed on the rocker arm 1 on the side of the rocker arm shaft 101 away from the cam 2. The exhaust reset mechanism 3 includes a cavity, an exhaust top member 301, an exhaust reset one-way structure, and an exhaust piston. The exhaust top member 301 is disposed within the cavity to divide the cavity into an upper cavity 302 and a lower cavity 303. The exhaust reset one-way structure is disposed between the lower cavity 303 and the upper cavity 302 to prevent fluid from flowing out of the upper cavity. 302 flows into the lower cavity 303. The exhaust piston is slidably disposed in the lower cavity 303. The upper end of the exhaust piston can contact the exhaust top 301, and the lower end of the exhaust piston is used to contact the vehicle's exhaust structure (e.g., exhaust valve bridge 7). The braking mechanism 4 includes a sealing structure, a brake piston 401, and a first brake chamber 402 and a second brake chamber 403 that are interconnected. The first brake chamber 402 is connected to the lower cavity 303, and the second brake chamber 403 is connected to the upper cavity 302. The brake piston 401 is slidably disposed in the second brake chamber 403. The sealing structure is disposed on the connecting pipe between the second brake chamber 403 and the first brake chamber 402 to block the connecting pipe. The lower end of the brake piston 401 can contact the vehicle's exhaust structure (e.g., exhaust valve 8). The rocker arm 1 is provided with a main oil passage 103 that is connected to the first brake chamber 402.

[0036] In this embodiment, the lower end of the exhaust piston can be configured to always be in contact with the vehicle's exhaust structure (e.g., exhaust valve bridge 7), and the upper end of the exhaust piston can be at a set distance from the exhaust top member 301. The exhaust reset mechanism 3 and the braking mechanism 4 are located at the two ends of the rocker arm shaft 101, respectively, with the roller 102. When one end of the roller 102 rises, the other end falls accordingly, and when one end of the roller 102 falls, the other end rises accordingly. When the vehicle does not require braking, low-pressure oil is introduced into the main oil passage 103. The low-pressure oil enters the first brake chamber 402 and the second brake chamber 403, and then enters the upper chamber 302 and the lower chamber 303. At this time, the low-pressure oil can lubricate the components on the rocker arm brake device. When the roller 102 rolls along the circumference of the base circle 201 past the brake protrusion 202, the lift of the brake protrusion 202 is insufficient to make the exhaust piston contact the exhaust top 301 to push open the vehicle's exhaust structure (e.g., exhaust valve bridge 7). At the same time, the oil pressure and the lift of the brake protrusion 202 are also insufficient to make the brake piston 401 open another exhaust structure of the vehicle (e.g., exhaust valve 8). When the roller 102 rolls past the exhaust protrusion 203, the lift of the exhaust protrusion 203 is large, at least sufficient to make the exhaust piston contact the exhaust top 301. Under the reaction force of the exhaust top 301, the exhaust piston opens the vehicle's exhaust structure (e.g., exhaust valve bridge 7), thereby achieving normal exhaust.

[0037] When braking is required, high-pressure oil is introduced into the main oil passage 103. The high-pressure oil enters the first braking chamber 402, then the lower chamber 303, and through the opening of the sealing structure (i.e., connecting the first and second braking chambers 402), it enters the second braking chamber 403. The oil in the second braking chamber 403 can enter the upper chamber 302. The oil in the lower chamber 303 enters the upper chamber 302 through the opening of the exhaust reset one-way structure (i.e., connecting the lower and upper chambers 303), and then enters the upper chamber 302. At this time, the high pressure in the first braking chamber 402... Oil can push the brake piston 401 downward to contact the exhaust valve 8. The brake sealing component 404 can block the connecting pipe between the second brake chamber 403 and the first brake chamber 402. At this time, the second brake chamber 403 and the upper chamber 302 are filled with oil, and the upper chamber 302 and the second brake chamber 403 form a sealed structure. The oil can achieve a rigid connection and can transmit force. When the roller 102 rolls over the brake protrusion 202, the stroke of the brake protrusion 202 is converted into the downward stroke of the brake piston 401, which can open the exhaust valve 8 and realize braking.

[0038] After braking is completed, and before the roller 102 reaches the highest point of the brake protrusion 202, the exhaust reset one-way structure connects the upper cavity 302 and the lower cavity 303. During the process of the exhaust piston moving towards the exhaust top 301, the exhaust piston continuously squeezes the oil between the exhaust piston, the lower cavity 303 and the upper cavity 302, so that the pressure of the oil is greater than the pressure of the high-pressure oil in the main oil passage 103. Then the oil can be returned through the connecting pipe between the lower cavity 303 and the first brake chamber 402, thereby depressurizing the second brake chamber 403, thus achieving brake failure and causing the brake piston 401 to reset.

[0039] The rocker arm brake device provided in this embodiment can achieve braking and non-braking by varying the pressure of the supplied oil. It has a simple structure, a simple control process, and high braking power. Moreover, the exhaust reset mechanism 3 can realize normal exhaust and reset of the braking mechanism 4, integrating the exhaust and reset functions into one cavity. This simplifies the structure of the rocker arm brake device, making the components on the rocker arm brake device compact, reducing assembly, and making installation convenient and efficient.

[0040] It should be noted that a solenoid valve can be installed on the main oil passage 103 to control the on / off of the pressurized oil or to control the switching between low-pressure oil and high-pressure oil.

[0041] like Figures 4 to 6 As shown, based on the above embodiment, the rocker arm braking device further includes a pressure regulating mechanism 5. The pressure regulating mechanism 5 includes a pressure regulating chamber 501 disposed on the rocker arm 1, and a pressure regulating piston 502 and a pressure regulating elastic element 503 (e.g., a spring) disposed within the pressure regulating chamber 501. The pressure regulating elastic element 503 is connected between the inner wall of the pressure regulating chamber 501 and the pressure regulating piston 502. The pressure regulating chamber 501 is connected to the lower cavity 303 through a pressure regulating pipeline. The wall of the pressure regulating chamber 501 is provided with a drain hole 504 for communicating with the outside. The pressure regulating piston 502 can open and block the drain hole 504.

[0042] In this embodiment, by setting the preload of the pressure regulating elastic element 503, the pressure regulating elastic element 503 presses the bottom of the pressure regulating piston 502 toward the bottom of the pressure regulating chamber 501, and the height of the pressure regulating piston 502 can block the drain hole 504; under the action of external force, the pressure regulating elastic element 503 can be compressed, thereby driving the pressure regulating piston 502 to move away from the bottom of the pressure regulating chamber 501 until the drain hole 504 is opened. In the non-braking state, low-pressure oil can be supplied to the rocker arm brake device. The bottom of the pressure regulating piston 502 is located at the bottom of the pressure regulating chamber 501, and the pressure regulating piston 502 blocks the drain hole 504. In the braking state, the braking process can be divided into three stages: oil inlet, braking, and reset (referring to the reset of the braking mechanism 4, specifically the reset of the braking piston 401). During the braking stage, the pressure regulating mechanism 5 does not work. During the reset process of the braking mechanism 4, the exhaust reset one-way structure connects the upper chamber 302 and the lower chamber 303 (specifically, described in detail below). The pressure regulating chamber 501 is connected to the lower chamber 303. High-pressure oil entering the upper chamber 302 enters the pressure regulating chamber 501. The pressure of the high-pressure oil is higher than the pre-pressure of the pressure regulating elastic element 503. The high-pressure oil will push the pressure regulating piston 502 to compress the pressure regulating elastic element 503 and move it away from the bottom of the pressure regulating chamber 501. When the pressure regulating piston 502 opens the drain hole 504, the high-pressure oil flows out from the drain hole 504, realizing pressure relief. The pressure regulating mechanism 5 can relieve pressure when the pressure of the high-pressure oil in the rocker arm brake device is too high, thereby improving the safety and reliability of the rocker arm brake device. After the pressure relief is completed, the oil inlet stage will begin. At this time, the pre-pressure of the pressure regulating elastic element 503 is higher than the oil pressure in the pressure regulating chamber 501. The oil will be back-pressurized through the pressure regulating pipeline and the lower chamber 303 into the upper chamber 302 to realize the oil inlet function, which enables the upper chamber 302 to quickly replenish oil in the next braking cycle.

[0043] like Figure 1 , Figure 2 , Figure 7 and Figure 9 As shown, based on the above embodiment, the exhaust top member 301 further includes a vertical side top plate and a horizontal plate connected to the vertical side top plate. The horizontal plate is provided with a connecting hole connecting the lower cavity 303 and the upper cavity 302. The exhaust reset one-way structure includes an exhaust sealing member 304 and an upper exhaust elastic member 305. The exhaust sealing member 304 is disposed on the upper side of the connecting hole at the connecting opening. The upper exhaust elastic member 305 connects the top of the cavity and the exhaust sealing member 304.

[0044] In this embodiment, the oil in the lower cavity 303 can push the exhaust sealing member 304 (e.g., a steel ball) upward, thereby opening the communication hole and allowing the oil to enter the upper cavity 302 from the lower cavity 303; conversely, this will not work. The upper exhaust elastic member 305 can be a spring sheet or a spring, etc. Before the brake is completed and the roller 102 reaches the highest point of the brake protrusion 202, the exhaust plug 304 will contact the exhaust piston. Under the action of the valve spring force (the spring force of the vehicle's exhaust structure) and cylinder pressure, the exhaust plug 304 will move upward, thereby opening the exhaust reset one-way structure and connecting the upper chamber 302 and the lower chamber 303. During the process of the exhaust piston moving towards the exhaust top 301, the exhaust piston continuously squeezes the oil between the exhaust piston, the lower chamber 303 and the upper chamber 302, so that the oil pressure is greater than the high pressure of the main oil passage 103. Then the oil can flow back through the connecting pipe between the lower chamber 303 and the first brake chamber 402, thereby depressurizing the second brake chamber 403, thus achieving brake failure and resetting the brake piston 401.

[0045] The exhaust reset mechanism 3 can have various structural forms, such as: Figure 1 , Figure 2 and Figure 7 As shown, the exhaust piston includes an exhaust piston rod 306 and a lower exhaust elastic member 307; one end of the lower exhaust elastic member 307 is connected to the lower side of the transverse plate, and the other end of the exhaust elastic member is connected to the exhaust piston rod 306. The upper end of the exhaust piston rod 306 can contact the exhaust top member 301, and the lower end of the exhaust piston rod 306 is used to contact the exhaust valve bridge 7.

[0046] In this embodiment, the lower exhaust elastic member 307 is preferably a spring. The cross-sectional area of ​​the upper half of the exhaust piston rod 306 is smaller than the cross-sectional area of ​​the lower half of the exhaust piston. Therefore, the lower exhaust elastic member 307 can be sleeved on the upper half of the exhaust piston, so that the installation of the lower exhaust elastic member 307 is stable.

[0047] For example: Figure 8 As shown, the exhaust piston includes an exhaust sliding pin 308, an exhaust push rod 309, and a lower exhaust elastic member 307. The exhaust sliding pin 308 is provided with a mounting groove with an opening facing the transverse plate. The exhaust push rod 309 and the lower exhaust piston are disposed in the mounting groove. One end of the lower exhaust elastic member 307 is connected to the exhaust push rod 309, and the other end of the lower exhaust elastic member 307 is connected to the transverse plate. The exhaust sliding pin 308 is slidably disposed in the lower cavity 303. The upper end of the exhaust sliding pin 308 can contact the exhaust push member 301, and the lower end of the exhaust sliding pin 308 is used to contact the vehicle's exhaust structure (e.g., exhaust valve bridge 7).

[0048] For example: Figure 9As shown, the exhaust piston also includes an exhaust guide sleeve 310 and a first lifting elastic member 311. The top of the exhaust guide sleeve 310 is provided with a sliding hole, and the bottom of the exhaust guide sleeve 310 is provided with an installation port. The exhaust push rod 309 includes an upper push rod section and a lower sliding section connected to each other. The cross-sectional area of ​​the upper push rod section is smaller than that of the lower sliding section (that is, the upper push rod section and the lower sliding section form a stepped structure). The lower sliding section is slidably disposed in the exhaust guide sleeve, and the upper push rod section passes through the sliding hole. The lower sliding section is provided with a first groove opening downwards. One end of the first lifting elastic member 311 is connected to the bottom of the first groove, and the other end of the first lifting elastic member 311 is connected to the bottom of the exhaust sliding pin 308. The lower exhaust elastic member 307 is connected to the exhaust guide sleeve 310. The first lifting elastic member 311 allows the exhaust sealing member 304 to be opened easily under normal conditions, allowing oil to enter from the lower cavity 303 to the upper cavity 302.

[0049] For example: Figure 10 As shown, the exhaust piston also includes a second lifting elastic member 312; the exhaust push rod 309 has a second groove with an opening facing downwards, one end of the second lifting elastic member 312 is connected to the bottom of the second groove, and the other end of the second lifting elastic member 312 is connected to the bottom of the exhaust sliding pin 308; the upper part of the exhaust sliding pin 308 has an annular groove, and the lower exhaust elastic member 307 is connected to the bottom of the annular groove. The second lifting elastic member 312 allows the exhaust sealing member 304 to be easily opened under normal conditions, allowing oil to enter from the lower cavity 303 to the upper cavity 302.

[0050] Based on any of the above embodiments, the braking mechanism 4 can further have various structural forms, such as: Figure 1 As shown, the rocker arm 1 is provided with a first oil passage 104 and a second oil passage 105; the brake piston 401 includes an upper brake piston section and a lower brake piston section connected to each other, and the cross-sectional area of ​​the upper brake piston section is larger than the cross-sectional area of ​​the lower brake piston section 401 (that is, the upper brake piston section and the lower brake piston section form a stepped structure), and the upper brake piston section abuts against the inner wall of the brake chamber; the upper brake piston section divides the brake chamber into a first brake chamber 402 and a second brake chamber 403 arranged from bottom to top, and the second brake chamber 403 is connected to the upper chamber through the first oil passage 104. The first brake chamber 402 is connected to the second brake chamber 303 via the second oil passage 105; the upper piston section is provided with a first annular groove, a central oil passage, and an oil port connected to the central oil passage; the sealing structure includes a brake sealing element 404 and an upper brake elastic element 405, the brake sealing element 404 is located at the oil port, and the upper brake elastic element 405 is connected between the top of the second brake chamber 403 and the sealing element; the first brake chamber 402 is also provided with a lower brake elastic element 406, which is connected between the lower brake piston section and the second brake chamber 403.

[0051] In this embodiment, when the engine is working normally, at the base circle 201 stage of the cam 2, the brake piston 401 is in a non-working state under the action of the lower brake elastic member 406; low-pressure oil is introduced into the main oil passage 103, and the low-pressure oil enters the first annular groove from the main oil passage 103. Then, a part of the oil enters the second oil passage 105 from the first annular groove, and then enters the lower cavity 303 from the second oil passage 105; another part of the oil enters the central oil passage from the first annular groove. The oil in the central oil passage pushes open the brake sealing member 404, thereby entering the second brake cavity 403. Then, the oil enters the first oil passage 104 from the second brake cavity 403, and then enters the upper cavity 302. The oil plays a lubricating role. When cam 2 rotates to the point where brake protrusion 202 contacts roller 102, exhaust function is not possible because a predetermined distance is maintained between exhaust piston and exhaust top member 301, and the lift generated by brake protrusion 202 is insufficient to eliminate this predetermined distance. The second brake chamber 403, second oil passage 105, and upper chamber 302 form a sealed cavity filled with oil. A predetermined gap is also maintained between brake piston 401 and exhaust valve 8, and the pressure generated by low-pressure oil can only eliminate a small portion of this gap. The lift generated by brake protrusion 202 is still insufficient to eliminate this predetermined gap. When cam 2 rotates to the point where exhaust protrusion 203 contacts roller 102, the lift of exhaust protrusion 203 is larger. This lift is still insufficient to make brake piston 401 abut against exhaust valve 8, but sufficient to make exhaust piston abut against exhaust top member 301. Under the reaction force of exhaust top member 301, valve bridge 7 is pushed, thereby achieving exhaust.

[0052] When the brake is engaged, the pressure of the oil entering the main oil passage 103 increases under the action of the solenoid valve, that is, high-pressure oil is introduced into the main oil passage 103; low-pressure oil enters the first annular groove from the main oil passage 103, and then part of the oil enters the second oil passage 105 from the first annular groove, and then enters the lower cavity 303 from the second oil passage 105; another part of the oil enters the central oil passage from the first annular groove, and the oil in the central oil passage pushes open the brake sealing member 404, thereby entering the second brake chamber 403, and then the oil enters the first oil passage 104 from the second brake chamber 403, and then enters the upper cavity 302; At this time, the oil in the second brake chamber 403 can push the brake piston 401 downward to compress the lower brake elastic element 406. When the lower brake elastic element 406 is compressed in large quantities and the brake piston 401 extends to a sufficient length, the set gap between the brake piston 401 and the exhaust valve 8 is eliminated. At this time, the second brake chamber 403, the first oil passage 104 and the upper chamber 302 form a sealed chamber and are filled with high-pressure oil. When the cam 2 rotates to the brake protrusion 202, the lift of the brake protrusion 202 is completely converted into the downward distance of the brake protrusion 202, so that the brake piston 401 can open the exhaust valve 8.

[0053] In each braking cycle, before the roller 102 reaches the highest point of the brake protrusion 202 after braking is completed, the exhaust plug 304 contacts the exhaust piston. Under the action of the valve spring force and cylinder pressure, the exhaust plug 304 moves upward, thereby opening the exhaust reset structure and connecting the upper chamber 302 and the lower chamber 303. As the exhaust piston moves towards the exhaust top 301, it continuously squeezes the oil between the exhaust piston, the lower chamber 303, and the upper chamber 302, making the oil pressure greater than the high-pressure oil pressure in the main oil passage 103. This allows the oil to flow back through the connecting pipe between the lower chamber 303 and the first brake chamber 402, thereby depressurizing the second brake chamber 403 and causing brake failure, allowing the brake piston 401 to reset. After braking is completed and the solenoid valve is closed, the oil pressure entering the main oil passage 103 decreases, and the brake piston 401 resets under the action of the lower brake elastic element 406. At this time, the engine returns to normal operation.

[0054] For example: Figure 2 and Figure 3 As shown, the sealing structure includes a sealing elastic element 407 and a sealing piston 408. The sealing piston 408 is slidably disposed in the first braking chamber 402, and the sealing elastic element 407 is connected between the sealing piston 408 and the first braking chamber 402. The sealing piston 408 is provided with a second annular groove, an axially extending flow channel, and an oil hole provided on the side wall of the sealing piston 408. The rocker arm 1 is provided with an intermediate oil passage 409 connecting the first braking chamber 402 and the second braking chamber 403, and the sealing piston 408 can block the intermediate oil passage 409. The brake piston 401 includes a brake piston 401 rod and a brake elastic element. The brake piston 401 rod is slidably disposed in the second braking chamber 403, and the brake elastic element is connected between the brake elastic element and the second braking chamber 403.

[0055] In this embodiment, the brake piston 401 is normally in contact with the exhaust valve 8. When braking is not required, low-pressure oil is introduced into the main oil passage 103. The low-pressure oil enters the first brake chamber 402. Part of the oil enters the second brake chamber 403 through the lower part of the first brake chamber 402, and another part of the oil enters the upper part of the second brake chamber 403 through the flow channel, oil hole, and second annular groove. This part of the oil can then enter the upper chamber 302 through the first oil passage 104. The low-pressure oil serves as a lubricant. The blocking piston 408 is located at the bottom of the first brake chamber 402, acting as the blocking elastic member 407. When the cam 2 rotates to the brake protrusion 202, the oil pressure is insufficient to overcome the valve pressure, so the brake elastic member is compressed and the brake piston 401 moves upward, preventing the brake piston 401 from opening the exhaust valve 8. When braking is engaged... When activated, high-pressure oil enters the first brake chamber 402. A portion of the oil passes through the lower part of the first brake chamber 402 into the second brake chamber 403, while another portion passes through the flow channel, oil hole, and second annular groove into the upper part of the second brake chamber 403. This portion of oil can then pass through the first oil passage 104 into the upper chamber 302. Inside the first brake chamber 402, the pressure of the high-pressure oil is sufficient to push the sealing piston 408 upward against the pressure of the sealing elastic element 407. This causes the sealing piston 408 to block the intermediate oil passage 409, thereby forming a sealed cavity consisting of the upper chamber 302, the first oil passage 104, the intermediate oil passage 409, and the second brake chamber 403, which is filled with high-pressure oil. At this time, when the cam 2 rotates to the brake protrusion 202, the brake piston 401 cannot move upward, thus opening the exhaust valve 8 to achieve the braking function.

[0056] Embodiments of the present invention also provide a vehicle that includes a rocker arm braking device according to any of the above-described technical solutions, and thus has all the beneficial technical effects of the rocker arm braking device, which will not be repeated here.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. Numerous specific details are set forth in the specification provided herein. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification. Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of the present invention and form different embodiments.

Claims

1. A rocker arm braking device, comprising a rocker arm (1) and a cam (2), wherein the rocker arm (1) is rotatably connected to an external component via a rocker arm shaft (101), one end of the rocker arm (1) is provided with a roller (102), the roller (102) abutting against the cam (2), the cam (2) comprising a base circle (201), an exhaust protrusion (203) disposed on the base circle (201), and a braking protrusion (202), characterized in that, Also includes: An exhaust reset mechanism (3) and a braking mechanism (4) are provided on the rocker arm (1) on the side of the rocker arm shaft (101) away from the cam (2). The exhaust reset mechanism (3) includes a cavity, an exhaust top (301), an exhaust reset one-way structure, and an exhaust piston; the exhaust top (301) is disposed in the cavity to divide the cavity into an upper cavity (302) and a lower cavity (303); the exhaust reset one-way structure is disposed between the lower cavity (303) and the upper cavity (302) to prevent fluid from flowing from the upper cavity (302) into the lower cavity (303); the exhaust piston is slidably disposed in the lower cavity (303); the upper end of the exhaust piston can contact the exhaust top (301); and the lower end of the exhaust piston is used to contact the exhaust structure of the vehicle. The exhaust top member (301) includes a vertical side top plate and a horizontal plate connected to the vertical side top plate. The horizontal plate is provided with a connecting hole connecting the lower cavity (303) and the upper cavity (302). The exhaust reset one-way structure includes an exhaust plug (304) and an upper exhaust elastic member (305). The exhaust plug (304) is disposed on the upper side of the connecting hole. The upper exhaust elastic member (305) connects the top of the upper cavity (302) and the exhaust plug (304). The exhaust piston includes an exhaust sliding pin (308), an exhaust push rod (309), and a lower exhaust elastic member (307); the exhaust sliding pin (308) is provided with a mounting groove with an opening facing the transverse plate, the exhaust push rod (309) and the lower exhaust elastic member are disposed in the mounting groove, one end of the lower exhaust elastic member (307) is connected to the exhaust push rod (309), and the other end of the lower exhaust elastic member (307) is connected to the transverse plate; the exhaust sliding pin (308) is slidably disposed in the lower cavity (303), the upper end of the exhaust sliding pin (308) can contact the exhaust push member (301), and the lower end of the exhaust sliding pin (308) is used to contact the exhaust valve bridge (7); The braking mechanism (4) includes a sealing structure, a brake piston (401), and a first brake chamber (402) and a second brake chamber (403) that are interconnected. The first brake chamber (402) is connected to the lower cavity (303), and the second brake chamber (403) is connected to the upper cavity (302). The brake piston (401) is slidably disposed in the second brake chamber (403). The sealing structure is disposed on the connecting pipe between the second brake chamber (403) and the first brake chamber (402) to block the connecting pipe. The lower end of the brake piston (401) can be used to contact the exhaust structure of the vehicle. The rocker arm (1) is provided with a main oil passage (103) that is connected to the first brake chamber (402).

2. The rocker arm braking device according to claim 1, characterized in that, The rocker arm braking device further includes a pressure regulating mechanism (5), which includes a pressure regulating chamber (501) disposed on the rocker arm (1), a pressure regulating piston (502) and a pressure regulating elastic element (503) disposed in the pressure regulating chamber (501). The pressure regulating elastic element (503) is connected between the inner wall of the pressure regulating chamber (501) and the pressure regulating piston (502). The pressure regulating chamber (501) is connected to the lower cavity (303). The wall of the pressure regulating chamber (501) is provided with a drain hole (504) for communicating with the outside. The pressure regulating piston (502) can open and block the drain hole (504).

3. The rocker arm braking device according to claim 1, characterized in that, The exhaust piston includes an exhaust piston rod (306) and a lower exhaust elastic member (307); one end of the lower exhaust elastic member (307) is connected to the lower side of the transverse plate, and the other end of the lower exhaust elastic member (307) is connected to the exhaust piston rod (306). The upper end of the exhaust piston rod (306) can contact the exhaust top member (301), and the lower end of the exhaust piston rod (306) is used to contact the exhaust valve bridge (7).

4. The rocker arm braking device according to claim 1, characterized in that, The exhaust piston also includes an exhaust guide sleeve (310) and a first lifting elastic element (311); the top of the exhaust guide sleeve (310) is provided with a sliding hole, the bottom of the exhaust guide sleeve (310) is provided with an installation port, the exhaust push rod (309) includes an upper push rod section and a lower sliding section connected to each other, the cross-sectional area of ​​the upper push rod section is smaller than the cross-sectional area of ​​the lower sliding section, the lower sliding section is slidably disposed in the exhaust guide sleeve, and the upper push rod section passes through the sliding hole; The lower sliding section is provided with a first groove with an opening facing downwards. One end of the first lifting elastic member (311) is connected to the bottom of the first groove, and the other end of the first lifting elastic member (311) is connected to the bottom of the exhaust sliding pin (308). The lower exhaust elastic member (307) is connected to the exhaust guide sleeve (310).

5. The rocker arm braking device according to claim 1, characterized in that, The exhaust piston also includes a second lifting elastic member (312); the exhaust push rod (309) is provided with a second groove with an opening facing downward, one end of the second lifting elastic member (312) is connected to the bottom of the second groove, and the other end of the second lifting elastic member (312) is connected to the bottom of the exhaust sliding pin (308); The upper part of the exhaust sliding pin (308) is provided with an annular groove, and the lower exhaust elastic member (307) is connected to the bottom of the annular groove.

6. The rocker arm braking device according to any one of claims 1-5, characterized in that, The rocker arm (1) is provided with a first oil passage (104) and a second oil passage (105); the brake piston (401) includes an upper brake piston section and a lower brake piston section connected to each other, and the cross-sectional area of ​​the upper brake piston section is larger than the cross-sectional area of ​​the lower brake piston section, and the upper brake piston section abuts against the inner wall of the brake chamber. The upper brake piston section divides the brake chamber into a first brake chamber (402) and a second brake chamber (403) arranged from bottom to top. The second brake chamber (403) is connected to the upper cavity (302) through the first oil passage (104), and the second brake chamber (403) is connected to the lower cavity (303) through the second oil passage (105). The upper brake piston section is provided with a first annular groove, a central oil passage, and an oil port connected to the central oil passage. The sealing structure includes a brake sealing element (404) and an upper brake elastic element (405). The brake sealing element (404) is disposed at the oil port, and the upper brake elastic element (405) is connected between the top of the second brake chamber (403) and the sealing element. The first brake chamber (402) is also provided with a lower brake elastic element (406), which is connected between the lower brake piston section and the second brake chamber (403).

7. The rocker arm braking device according to any one of claims 1-5, characterized in that, The sealing structure includes a sealing elastic element (407) and a sealing piston (408). The sealing piston (408) is slidably disposed in the first braking chamber (402). The sealing elastic element (407) is connected between the sealing piston (408) and the first braking chamber (402). The sealing piston (408) is provided with a second annular groove, an axially extending flow channel, and an oil hole provided on the side wall of the sealing piston (408). The rocker arm (1) is provided with an intermediate oil passage (409) connecting the first brake chamber (402) and the second brake chamber (403), and the blocking piston (408) can block the intermediate oil passage (409). The brake piston (401) includes a brake piston (401) rod and a brake elastic element. The brake piston (401) rod is slidably disposed in the second brake chamber (403), and the brake elastic element is connected between the brake elastic element and the second brake chamber (403).

8. A vehicle, characterized in that, It includes a mounting part and a rocker arm (1) braking mechanism (4) as described in any one of claims 1-7, wherein the rocker arm shaft (101) is rotatably connected to the mounting part.

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