Rocker arm braking device and vehicle

Abstract

The utility model provides a rocker arm brake device, which comprises a rocker arm, a plurality of cavities, a brake cavity and a one-way valve cavity, a separation piece is arranged in the exhaust cavity, a first communication channel is arranged on the separation piece to divide the exhaust cavity into an upper cavity and a lower cavity which are communicated with each other, the upper cavity is communicated with the brake cavity, and the one-way valve cavity is communicated with the brake cavity; and the switch assembly is arranged in the exhaust cavity to open and close a first communication channel between the upper cavity and the lower cavity, and the switch assembly opens the first communication channel when the engine is in a normal working state. Part of high-pressure oil in the brake cavity enters the one-way valve cavity and part of the high-pressure oil in the upper cavity can also enter the brake cavity, that is, the high-pressure oil is supplied to the brake cavity through two oil ways, so that the oil inlet speed of the brake cavity is high, and rapid exhaust and auxiliary exhaust can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle engine braking, in particular to a rocker arm braking device and a vehicle. Background Art

[0002] Prolonged braking on downhill sections while driving can cause brake overheating, which can affect brake life over time. Rocker brakes utilize a technology that achieves in-cylinder braking by prematurely or delayed opening of the exhaust valve. Existing rocker brakes typically utilize a hydraulic tappet structure to activate and deactivate the braking function. The brake chamber in these existing rocker brakes is typically connected to an oil inlet channel, resulting in a slow oil flow rate. Utility Model Content

[0003] The purpose of the utility model is to provide a rocker arm brake device and a vehicle, so as to solve, to a certain extent, the technical problem in the prior art that the brake chamber in the rocker arm brake device is usually connected to the oil inlet channel and the oil inlet speed is slow.

[0004] The utility model provides a rocker arm brake device, comprising: a cam, wherein a braking protrusion and an exhaust protrusion are provided on the cam at intervals along the circumferential direction of the cam; the height of the braking protrusion is smaller than the exhaust protrusion; a rocker arm, which is rotatably connected to the vehicle body through a rocker arm shaft; a plurality of cavities and rollers in contact with the cam are provided on both sides of the rocker arm shaft; the plurality of cavities include an exhaust chamber, a braking chamber and a one-way valve chamber; a partition is provided in the exhaust chamber, and a first connecting channel is provided on the partition to separate the exhaust chamber into an upper chamber and a lower chamber that are connected to each other, the upper chamber is connected to the braking chamber, and the one-way valve chamber Connected to the brake chamber; a switch assembly is arranged in the exhaust chamber to switch the first connecting channel between the upper chamber and the lower chamber. When the engine is in normal working condition, the switch assembly opens the first connecting channel; an exhaust assembly is slidably arranged in the lower chamber for contacting the exhaust valve bridge; a first set interval is provided between the exhaust assembly and the partition; a brake assembly is arranged in the brake chamber for contacting the exhaust valve pin; a one-way valve assembly is arranged in the one-way valve chamber for switching the second connecting channel between the one-way valve chamber and the brake chamber; a total oil channel is arranged on the rocker arm shaft, and the total oil channel is connected to the brake chamber and the lower chamber.

[0005] In addition to the part of high-pressure oil in the brake chamber entering the one-way valve chamber, another part can enter the upper chamber, that is, there are two oil circuits to supply high-pressure oil to the brake chamber, which makes the oil inlet speed of the brake chamber fast, and can achieve faster exhaust and assist exhaust; in addition, increasing the oil inlet rate of the brake chamber can make the braking performance more stable, reduce the pressure in the cylinder during braking, and improve overall reliability.

[0006] Furthermore, the multiple cavities also include an oil drain chamber, and an oil drain port for communicating with the outside is provided on the side wall of the oil drain chamber; the oil drain chamber is connected to the main oil channel; the rocker arm brake device also includes an oil drain assembly, and the oil drain assembly is arranged in the oil drain chamber to open and close the oil drain port. When the engine is in normal working condition, the oil drain assembly closes the oil drain port.

[0007] Furthermore, an opening is provided at the bottom of the brake chamber; the brake assembly includes: a brake piston, which is provided in the brake chamber, and the lower end of the brake piston can always be in contact with the exhaust valve pin when the engine is in normal working condition; a brake spring, one end of the brake spring is connected to the top of the brake chamber, and the other end is connected to the brake piston; a retaining ring, which is provided at the opening to limit the lower part of the brake piston.

[0008] Furthermore, a threaded hole is provided at the top of the brake chamber, and an opening is provided at the bottom of the brake chamber; the brake assembly includes: a locking nut, which is tightened in the threaded hole; an adjusting screw, the upper end of which is connected to the locking nut; a brake piston, which is slidably arranged in the brake chamber; when the engine is in normal working condition, the brake piston is used to have a second set interval with the exhaust valve pin; and a brake spring, which is connected between the adjusting screw and the brake piston.

[0009] Furthermore, the switch assembly includes: a blocking member, arranged in the upper chamber; a blocking member spring, arranged in the upper chamber, the blocking member being connected between the inner wall of the upper chamber and the blocking member; a push rod, at least partially located in the lower chamber, the top of the push rod extending into the first connecting channel to contact the blocking member; a push rod valve body, arranged in the lower chamber, the push rod being connected to the push rod valve body; and a push rod spring, connected between the exhaust assembly and the push rod.

[0010] Furthermore, the exhaust assembly includes: a sliding pin, which is slidably arranged in the lower cavity, and the first set interval is provided between the sliding pin and the partition; and a sliding pin spring, which is connected between the partition and the sliding pin.

[0011] Furthermore, a sliding pin groove is provided at the upper end of the sliding pin, at least part of the push rod valve body is located in the sliding pin groove, the push rod spring is connected between the bottom of the sliding pin groove and the bottom of the push rod valve body; the sliding pin spring is connected between the partition and the push rod valve body.

[0012] Furthermore, an opening is provided at the top of the one-way valve chamber; the one-way valve assembly includes: a sealing nut, which seals the opening at the top of the one-way valve chamber; a one-way valve spring, one end of which is connected to the sealing nut; a one-way valve ball, the other end of which is connected to the one-way valve ball; a gasket, which is arranged at the bottom of the one-way valve chamber, and the one-way valve ball can contact with most gaskets; the connection point between the main oil channel and the one-way valve chamber is located at the bottom of the one-way valve chamber.

[0013] Furthermore, an opening is provided at the top of the oil drain chamber, and a plugging cover is provided at the top opening of the oil drain chamber; the oil drain assembly includes: an oil drain piston, which is provided in the oil drain chamber; and an oil drain spring, one end of the oil drain spring is connected to the plugging cover, and the other end is connected to the oil drain piston.

[0014] The utility model provides a vehicle, comprising the rocker arm brake device.

[0015] It should be understood that both the foregoing general description and the following detailed description are for purposes of illustration and description and are not necessarily limiting of the present disclosure. The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate the subject matter of the present disclosure. Together, the description and the drawings serve to explain the principles of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a structural diagram of a rocker arm brake device according to an embodiment of the present invention;

[0018] Figure 2 for Figure 1 A top view of the rocker arm brake assembly is shown;

[0019] Figure 3 for Figure 2 A cross-sectional view of the rocker arm brake device at AA is shown;

[0020] Figure 4 for Figure 2 A cross-sectional view of the rocker arm brake device BB shown;

[0021] Figure 5 for Figure 2 A cross-sectional view of the rocker arm brake device CC shown;

[0022] Figure 6for Figure 2 A cross-sectional view of the rocker arm brake device oil drain assembly in an oil draining state is shown;

[0023] Figure 7 This is a schematic structural diagram of a rocker arm brake device according to another embodiment of the present invention;

[0024] Figure 8 for Figure 7 A cross-sectional view of the rocker arm brake assembly is shown.

[0025] Icons: 1-cam; 101-brake bulge; 102-exhaust bulge;

[0026] 2 - rocker arm; 201 - rocker arm shaft; 202 - roller; 203 - brake chamber; 204 - one-way valve chamber; 205 - partition; 206 - lower chamber; 207 - first communication channel; 208 - upper chamber; 209 - oil drain chamber; 210 - oil drain port; 211 - oil flow port; 212 - second communication channel; 213 - third communication channel; 214 - shaft oil channel;

[0027] 3- switch assembly; 301- blocking piece; 302- blocking piece spring; 303- ejector rod; 304- ejector rod valve body; 305- ejector rod spring;

[0028] 4-exhaust assembly; 401-sliding pin; 402-sliding pin spring;

[0029] 5-brake assembly; 501-brake piston; 502-brake spring; 503-circlip; 504-locking nut; 505-adjusting screw;

[0030] 6- one-way valve assembly; 601- blocking nut; 602- one-way valve spring; 603- one-way valve ball; 604- gasket;

[0031] 7- Main oil channel;

[0032] 8-drain assembly; 801-drain piston; 802-drain spring; 803-gasket; 804-circlip;

[0033] 10-exhaust valve bridge;

[0034] 11-Exhaust valve pin. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0036] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention.

[0037] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0038] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0040] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0041] It should be noted that the "high-pressure oil" and "low-pressure oil" described in the embodiments of the present invention are relative. The pressure of the high-pressure oil is greater than that of the low-pressure oil. The high-pressure oil can overcome a certain pressure to enable the rocker arm brake device to achieve braking, while the low-pressure oil mainly achieves lubrication.

[0042] like Figures 1 to 8As shown, the utility model provides a rocker arm brake device, including a cam 1, along the circumferential direction of the cam 1, the cam 1 is provided with a brake protrusion 101 and an exhaust protrusion 102 at intervals; a rocker arm 2, which is rotatably connected to the vehicle body through a rocker arm shaft 201; the rocker arm shaft 201 is provided with a plurality of chambers and rollers 202 in contact with the cam 1 on both sides of the rocker arm shaft 201; the plurality of chambers include an exhaust chamber, a brake chamber 203 and a one-way valve chamber 204; a partition 205 is provided in the exhaust chamber, and a first connecting channel 207 is provided on the partition 205 to separate the exhaust chamber into an upper chamber 208 and a lower chamber 206 that are connected to each other, the upper chamber 208 is connected to the brake chamber 203, and the one-way valve chamber 204 is connected to the brake chamber 203; a switch assembly 3 is provided in the exhaust chamber to switch the upper chamber 208 and the lower chamber 206. The first connecting channel 207 between the chamber 208 and the lower chamber 206, when the engine is in normal state (non-braking state), the switch assembly 3 opens the first connecting channel 207; the exhaust assembly 4 is slidably arranged in the lower chamber 206, for contacting the exhaust valve bridge 10; a first set interval is provided between the exhaust assembly 4 and the partition 205, and the first set interval is not less than the height of the brake protrusion 101 and not greater than the height of the exhaust protrusion 102; the brake assembly 5 is arranged in the brake chamber 203, for contacting the exhaust valve pin 11; the one-way valve assembly 6 is arranged in the one-way valve chamber 204, switching the second connecting channel 212 between the one-way valve chamber 204 and the brake chamber 203; the main oil channel 7 is arranged on the rocker arm shaft 201, and the main oil channel 7 is connected to the brake chamber 203 and the lower chamber 206.

[0043] In this embodiment, when the engine is operating normally, the switch assembly 3 keeps the first connecting channel 207 open, and the one-way valve assembly 6 keeps the second connecting channel 212 closed; low-pressure oil is supplied to the main oil channel 7 from the outside, and the low-pressure oil can enter the lower chamber 206 from the main oil channel 7, then enter the upper chamber 208, and then enter the brake chamber 203, and the low-pressure oil plays a lubricating role. When roller 202 moves along brake protrusion 101, because the height of brake protrusion 101 is not greater than the first predetermined distance between exhaust assembly 4 and separator 205, exhaust assembly 4 cannot open exhaust valve bridge 10, thereby preventing the exhaust valve from opening and exhausting. Because switch assembly 3 opens first communication channel 207, when brake assembly 5 is subjected to the force of exhaust valve pin 11, oil in brake chamber 203 flows from brake chamber 203 into upper chamber 208, then through first communication channel 207 into lower chamber 206, and then back to main oil passage 7, preventing the formation of a sealed chamber. Brake assembly 5 is also unable to open exhaust valve pin 11, preventing the exhaust valve from opening and exhausting. When cam 1 rotates until exhaust protrusion 102 contacts roller 202, valve lift is large. After the exhaust assembly 4 has completed the first predetermined distance, sufficient valve lift remains to activate exhaust valve bridge 10, thereby opening the exhaust valve and achieving normal exhaust.

[0044] When the engine is braking, high-pressure oil is supplied from the outside to the main oil channel 7, and the high-pressure oil enters the lower chamber 206 and the one-way valve chamber 204 through the main oil channel 7. At this time, the switch component 3 opens the first connecting channel, and the high-pressure oil can enter the upper chamber 208 from the lower chamber 206. The high-pressure oil entering the upper chamber 208 enters the brake chamber 203; at the same time, the one-way valve component 6 of the one-way valve chamber 204 opens, and the one-way valve component 6 opens the second connecting channel 212, and the high-pressure oil enters the brake chamber 203 from the second connecting channel 212; as the high-pressure oil continues to enter In the lower chamber 206, the switch assembly 3 closes the first connecting passage 207; the upper chamber 208 and the brake chamber 203 are filled with high-pressure oil. As the roller 202 slides along the cam 1 past the brake protrusion 101, the side of the rocker arm 2 with the roller 202 rises, and the corresponding side of the rocker arm 2 with the chamber descends. The upper chamber 208 and the brake chamber 203 are both filled with high-pressure oil and sealed, forming a hydraulic tappet structure to achieve force transmission. The amount of brake assembly 5 descends is also the distance to push the exhaust valve, which can open the exhaust valve to achieve exhaust braking. In addition, because the height of the brake protrusion 101 is less than the height of the exhaust protrusion 102, the brake protrusion 101 is not high enough to make the exhaust assembly 4 abut against the partition 205, and thus is not enough to push the exhaust valve bridge 10 open.

[0045] During this process, in addition to a part of the high-pressure oil in the brake chamber 203 entering the one-way valve chamber 204, a part of the high-pressure oil can also enter the upper chamber 208, that is, there are two oil circuits to supply high-pressure oil to the brake chamber 203, so that the brake chamber 203 has a fast oil intake speed, which can achieve faster exhaust and assist exhaust; during the oil intake process, the brake assembly 5 moves downward to increase the volume of the brake chamber 203, so that the oil pressure in the sealed chamber is lower than the oil pressure in the oil channel, thereby accelerating the oil intake rate; in addition, increasing the oil intake rate of the brake chamber 203 can make the braking performance more stable, reduce the cylinder pressure during braking, and improve overall reliability.

[0046] As an alternative, Figures 1 to 6 As shown, the multiple chambers also include an oil drain chamber 209, and an oil drain port 210 for communicating with the outside is provided on the side wall of the oil drain chamber 209; the oil drain chamber 209 is connected to the main oil channel 7; the rocker arm brake device also includes an oil drain component 8, which is arranged in the oil drain chamber 209 to open and close the oil drain port 210. When the engine is in normal working condition, the oil drain component 8 closes the oil drain port 210.

[0047] In this embodiment, during braking, the brake piston 501 pushes the exhaust pin 11, which exerts force on the brake piston 501, increasing the oil pressure within the brake chamber 203. After braking, the switch assembly 3 opens the second connecting passage 212, allowing the oil within the brake chamber 203 to flow out through the upper chamber 208 and the lower chamber 206. The oil can also enter the main oil passage 7 through the second connecting passage 212 and the one-way valve chamber 204, and then enter the oil drain chamber 209 from the main oil passage 7. The oil pushes the oil drain assembly 8 to open the oil drain port 210, allowing the oil to be discharged through the oil drain port 210, thereby relieving the pressure in the brake chamber 203. During the reset process, the oil within the brake chamber 203 can be discharged through the exhaust chamber and the oil drain chamber 209, increasing the oil drain rate and the reset speed of the brake piston 501. The rocker arm brake device provided in this embodiment can reset the brake piston 501.

[0048] Specifically, the brake assembly 5 may include a brake piston 501, which is slidably disposed in the brake chamber 203, and the lower end of the brake piston 501 can always be in contact with the exhaust valve pin 11 under normal working conditions of the engine; a brake spring 502, one end of the brake spring 502 is connected to the top of the brake chamber 203, and the other end is connected to the brake piston 501; a retaining ring 503, which is arranged at the opening to limit the lower part of the brake piston 501.

[0049] In this embodiment, the brake spring 502 and the brake piston 501 can be installed in the brake chamber 203 through the bottom opening of the brake chamber 203. A retaining ring 503 is provided at the bottom opening to limit the brake piston 501 and prevent it from falling out of the brake chamber 203. Specifically, the cross-section of the upper section of the brake piston 501 can be larger than the cross-section of the lower section of the brake piston 501, thereby forming a step on the brake piston 501, and the retaining ring 503 is retained at the step.

[0050] As another option, Figure 7 and Figure 8 As shown, a threaded hole is provided at the top of the brake chamber 203, and an opening is provided at the bottom of the brake chamber 203; the brake assembly 5 includes: a locking nut 504, the locking nut 504 is tightened in the threaded hole; an adjusting screw 505, the upper end of the adjusting screw 505 is connected to the locking nut 504; a brake piston 501 is slidably arranged in the brake chamber 203; when the engine is in normal working condition, the brake piston 501 is used to have a second set interval with the exhaust valve pin 11; a brake spring 502, the brake spring 502 is connected between the adjusting screw 505 and the brake piston 501.

[0051] In this embodiment, when the engine is operating normally, low-pressure oil flows sequentially through the main oil passage 7 into the exhaust chamber and brake chamber 203 to provide lubrication. Braking spring 502 forces the brake piston 501 to remain retracted, maintaining a second set distance from the exhaust valve pin 11. The first communication passage 207 is open. When the cam 1 rotates until the brake protrusion 101 contacts the roller 202, the exhaust assembly 4 cannot open the exhaust valve bridge 10 because the height of the brake protrusion 101 is not greater than the first set distance reserved between the exhaust assembly 4 and the separator 205. Consequently, the exhaust valve cannot be opened, preventing exhaust from occurring. Because the brake piston 501 is retracted, the lift generated by the brake protrusion 101 is insufficient to eliminate the second set distance between the brake piston 501 and the exhaust valve pin 11, preventing the exhaust valve from opening. When the cam 1 rotates until the exhaust protrusion 102 contacts the roller 202, the valve lift is significant. After the exhaust assembly 4 has completed the first set distance, sufficient valve lift remains to actuate the exhaust valve bridge 10, thereby opening the exhaust valve and achieving normal exhaust.

[0052] When the brake is on, high-pressure oil flows from the main oil passage 7 into the exhaust chamber and the brake chamber 203. The switch assembly 3 closes the first connecting passage 207, forming a sealed chamber in the brake chamber 203. When the cam 1 rotates to the brake protrusion 101, the oil in the brake chamber 203 cannot be discharged, and a hydraulic tappet structure is formed with the brake piston 501 to open the exhaust valve to achieve braking. During each braking cycle, high-pressure oil continues to flow in, and the switch assembly 3 is in a state of closing the first connecting passage 207, and no reset occurs. After braking is completed, the oil pressure entering the main oil passage 7 decreases, and the switch assembly 3 opens the first connecting passage 207, and the high-pressure oil flows back to the main oil passage 7. The high-pressure oil can flow out through the solenoid valve that controls the oil flow state (the solenoid valve includes an oil inlet and an oil outlet), and the engine returns to normal operation.

[0053] Based on any of the above embodiments, the switch assembly 3, the one-way valve assembly 6, and the oil drain assembly 8 can all be electric valves or solenoid valves.

[0054] As an optional solution, the switch assembly 3 includes: a blocking member 301 (which can be a blocking plate, preferably a blocking ball), which is arranged in the upper chamber 208; a blocking member spring 302, which is arranged in the upper chamber 208, and the blocking member 301 is connected between the inner wall of the upper chamber 208 and the blocking member 301; a push rod 303, which is at least partially located in the lower chamber 206, and the top of the push rod 303 extends into the first connecting channel 207 to contact the blocking member 301; a push rod valve body 304, which is arranged in the lower chamber 206, and the push rod 303 is connected to the push rod valve body 304; and a push rod spring 305, which is connected between the exhaust assembly 4 and the push rod 303.

[0055] In this embodiment, under normal engine operation, the push rod spring 305 exerts a certain preload, supporting the push rod 303 to push the blocking member 301 open, thereby opening the first connecting channel 207. When high-pressure oil enters the lower chamber 206, a portion of the high-pressure oil enters the upper chamber 208 through the first connecting channel 207. The high-pressure oil in the lower chamber 206 pushes the push rod valve body 304 downward (toward the exhaust valve bridge 10) until the blocking member 301 blocks the first connecting channel 207. During each braking cycle, when the rocker arm 2 rotates through a certain angle (when the roller is near the highest point of the brake protrusion), the blocking member 301 contacts the push rod 303. The valve spring force and cylinder pressure cause the blocking member 301 to move upward, thereby opening the first connecting channel 207. This structural switch assembly 3 can mechanically open and close the first connecting channel 207, simplifying the structure of the rocker arm brake device and ensuring the sealing of the exhaust chamber.

[0056] like Figures 1 to 8 As shown, based on the above embodiment, the exhaust assembly 4 further includes: a sliding pin 401, the sliding pin 401 is slidably arranged in the lower cavity 206, and a first set interval is provided between the sliding pin 401 and the partition 205; a sliding pin spring 402, the sliding pin spring 402 is connected between the partition 205 and the sliding pin 401.

[0057] In this embodiment, the sliding pin spring 402 can press the sliding pin 401 against the exhaust valve bridge 10 , so that the roller 202 is always in contact with the cam 1 , thereby preventing the roller 202 from being separated from the cam 1 .

[0058] like Figures 1 to 8 As shown, based on the above embodiment, further, a sliding pin 401 groove is provided at the upper end of the sliding pin 401, at least a portion of the push rod valve body 304 is located in the sliding pin 401 groove, and the push rod spring 305 is connected between the bottom of the sliding pin 401 groove and the bottom of the push rod valve body 304; the sliding pin spring 402 is connected between the partition 205 and the push rod valve body 304. This structure can make the structure in the exhaust chamber compact and occupy less space.

[0059] As an alternative, the exhaust chamber has openings at both the top and bottom. An adjustment screw 505 is used in the top separator 205 of the exhaust chamber, and internal threads are provided within the exhaust chamber to secure the adjustment screw 505. Separator 205 comprises a hollow cylindrical structure with internal and external threads. The bottom portion has a flat countersunk hole, which serves as a retaining mechanism for the slide pin spring 402. The center portion has a stepped hole with a chamfered opening for sealing with a ball seal. The top of the push rod 303 is spherical in shape, with a flat-bottomed circular hole in the center. The top of the push rod 303 is flat, allowing contact with the separator 205.

[0060] like Figures 1 to 8As shown, on the basis of the above embodiment, further, an opening is provided at the top of the one-way valve chamber 204; the one-way valve assembly 6 includes: a sealing nut 601, which seals the opening at the top of the one-way valve chamber 204; a one-way valve spring 602, one end of the one-way valve spring 602 is connected to the sealing nut 601; a one-way valve ball 603, the other end of the one-way valve spring 602 is connected to the one-way valve ball 603; a gasket 604, which is arranged at the bottom of the one-way valve chamber 204, and the one-way valve ball 603 can contact with most gaskets 604; the connection point between the main oil channel 7 and the one-way valve chamber 204 is located at the bottom of the one-way valve chamber 204 (preferably located below the gasket 604, at this time, the bottom of the one-way valve chamber 204 is a step structure, and the gasket 604 is clamped on the step structure).

[0061] In this embodiment, under normal engine operation, the one-way valve ball 603, under the action of the one-way valve spring 602, contacts the gasket 604, closing the second communication channel 212. When high-pressure oil enters the one-way valve chamber 204 from the main oil passage 7, it pushes the one-way valve ball 603 upward, opening the first communication channel 207. High-pressure oil then flows from the one-way valve chamber 204 into the brake chamber 203. The one-way valve assembly 6 provided in this embodiment relies on a mechanical structure to open and close the first communication channel 207, resulting in a simple structure and low cost.

[0062] like Figures 1 to 6 As shown, based on the above embodiment, the top of the oil drain chamber 209 is further provided with an opening, and the top opening of the oil drain chamber 209 is provided with a plugging cover. The oil drain assembly 8 includes: an oil drain piston 801, which is slidably mounted within the oil drain chamber 209; and an oil drain spring 802, one end of which is connected to the plugging cover and the other end to the oil drain piston 801. Specifically, a gasket 803 and a retaining spring 804 can be disposed between the plugging cover and the oil drain spring 802. The oil drain port 210 can be located on the side wall of the oil drain chamber 209, and the connection between the oil drain chamber 209 and the main oil passage 7 can be located at the bottom of the oil drain chamber 209.

[0063] In this embodiment, the oil drain assembly 8 relies on a mechanical structure to realize the opening and closing of the first communication channel 207 , which has a simple structure and low cost.

[0064] The shaft oil passage 214 on the rocker shaft 201 and the main oil passage 7 are connected to the shaft oil passage 214. The rocker shaft 201 is connected to the cylinder block of the engine through the rocker shaft 201 support. A solenoid valve is provided on the rocker shaft 201 support to supply oil to the shaft oil passage 214.

[0065] The brake chamber 203 and the upper chamber 208 are connected via a third communication channel 213. An oil flow port 211 is provided at the bottom of the one-way valve chamber 204 to communicate with the main oil channel 7. The one-way valve chamber 204 and the brake chamber 203 are connected via a second communication channel.

[0066] like Figures 1 to 6 As shown, in some optional technical solutions, the working process of the rocker arm brake device is as follows:

[0067] During normal engine operation, low-pressure oil passes through the solenoid valve, shaft oil passage 214, and main oil passage 7 in sequence. It then enters lower chamber 206, upper chamber 208, and brake chamber 203 through main oil passage 7. It also enters check valve chamber 204 through main oil passage 7, providing lubrication. Brake piston 501, under the action of brake spring 502, remains in contact with exhaust valve pin 11. Drain piston 801, under the action of drain spring 802, remains in contact with the bottom of drain chamber 209. At this point, blocking member 301 is pushed open by ejector pin 303, and first connecting passage 207 is open. When the cam 1 rotates until the brake protrusion 101 contacts the roller 202, because a first set gap is reserved between the sliding pin 401 and the adjusting screw 505, and the lift generated by the brake protrusion 101 is not enough to eliminate the gap, the sliding pin 401 end cannot open the exhaust valve bridge 10, and thus the exhaust valve cannot be opened to realize the exhaust function, and the first connecting channel 207 is in an open state. Therefore, when the brake piston 501 is subjected to the force of the exhaust valve pin 11, the oil in the brake chamber 203 flows back to the exhaust chamber through the third connecting channel 213, and a sealed chamber cannot be formed. At this time, the brake piston 501 cannot open the exhaust valve pin 11 and cannot open the exhaust valve. When the cam 1 rotates until the exhaust protrusion 102 contacts the roller 202, the valve lift is large at this time. After the sliding pin 401 has completed the first set interval, there is still enough valve lift to make the exhaust valve bridge 10 move, thereby opening the exhaust valve to achieve normal exhaust action. The exhaust valve pin 11 moves with the exhaust valve bridge 10, and the brake piston 501 is limited by the retaining ring 503, so that the brake piston 501 is disengaged from the exhaust valve pin 11.

[0068] When the brake is turned on, the oil pressure entering the shaft oil channel 214 and the main oil channel 7 is increased under the action of the solenoid valve, and the high-pressure oil enters the lower chamber 206, the upper chamber 208, the third connecting channel 213 and the brake chamber 203 in turn. At this time, the push rod 303 will move downward under the action of the high-pressure oil, and the sealing member 301 will close the first connecting channel 207 under the action of the sealing member spring 302, and a sealed chamber will be formed in the brake chamber 203 (when the entire chamber is filled with oil, the internal and external pressures of the steel ball sealing member are the same. At this time, the sealing member will close the first connecting channel under the action of the sealing member spring, and when the brake piston contacts the valve pin, the oil pressure in the sealing chamber is higher than the oil pressure in the channel due to the valve load, so a sealed chamber can be formed). When the cam 1 rotates to the brake protrusion 101, because the oil in the brake chamber 203 cannot be discharged, a hydraulic tappet structure is formed with the brake piston 501 to open the exhaust valve to achieve braking. During each braking cycle, when the rocker arm 2 rotates through a certain angle, the sealing member 301 contacts the push rod 303. The valve spring force and cylinder pressure cause the sealing member 301 to move upward, preventing the formation of a sealed chamber within the brake chamber 203 and achieving a reset function. During the reset process, the force exerted by the valve on the brake piston 501 increases the pressure of the high-pressure oil within the brake chamber 203. The high-pressure oil then flows through the brake chamber 203, the third connecting passage 213, the upper chamber 208, the first connecting passage 207, the lower chamber 206, the main oil passage 7, and the oil drain chamber 209. Due to the high oil pressure within the oil drain chamber 209 at this time, the oil drain piston 801 moves upward, exposing the oil drain hole, and the high-pressure oil leaks out of the oil drain hole to the outside. After the reset process is complete, the exhaust and oil-intake processes begin. During the oil-intake phase, the brake piston 501, under the action of the brake spring 502, moves downward, approaching the exhaust valve pin 11. At this point, the volume within the brake chamber 203 increases, while the oil pressure decreases. High-pressure oil then enters the brake chamber 203 again, sequentially passing through the main oil passage 7, the oil port, the one-way valve chamber 204, and the third connecting passage 213. High-pressure oil also enters the brake chamber 203 through the lower chamber 206, the first connecting passage 207, the upper chamber 208, and the third connecting passage 213. After the solenoid valve closes, the oil pressure within the main oil passage 7 decreases, and the push rod 303 is reset under the action of the push rod spring 305. The engine then resumes normal operation.

[0069] like Figure 7 and Figure 8 As shown, in some optional technical solutions, the working process of the rocker arm brake device is as follows:

[0070] When the engine is operating normally, low-pressure oil flows sequentially through the solenoid valve, shaft oil passage 214, and main oil passage 7 into the lower chamber 206, first communication passage 207, upper chamber 208, third communication passage 213, and brake chamber 203 to provide lubrication. The brake piston 501, under the action of the brake spring 502, remains in a retracted state, maintaining a second set distance from the exhaust valve pin 11. At this point, the blocking member 301 is pushed open by the push rod 303, and the first communication passage 207 is open. When the cam 1 rotates until the brake protrusion 101 contacts the roller 202, the first set distance is reserved between the sliding pin 401 and the separator 205, and the lift generated by the brake protrusion 101 is insufficient to eliminate the first set distance. Therefore, the sliding pin 401 cannot open the exhaust valve bridge 10, thereby preventing the exhaust valve from opening and achieving exhaust function. Since the brake piston 501 is in a retracted state, the lift generated by the brake protrusion 101 is insufficient to eliminate the second set distance. Therefore, the brake piston 501 does not move the exhaust valve pin 11, and the exhaust valve does not open. When the cam 1 rotates until the exhaust protrusion 102 contacts the roller 202, the valve lift is large. After the sliding pin 401 has completed the first set interval, there is still enough valve lift to activate the exhaust valve bridge 10, thereby opening the exhaust valve to achieve normal exhaust action.

[0071] When the brake is engaged, the solenoid valve increases the oil pressure entering the shaft oil passage 214 and the main oil passage 7. High-pressure oil then flows sequentially into the shaft oil passage 214, the main oil passage 7, the lower chamber 206, the first connecting passage 207, the upper chamber 208, the third connecting passage 213, and the brake chamber 203. At this point, the push rod 303 moves downward under the action of the high-pressure oil, and the blocking member 301, acting under the action of the blocking member spring 302, closes the first connecting passage 207, forming a sealed chamber within the brake chamber 203. When the cam 1 rotates to the brake protrusion 101, the oil in the brake chamber 203 cannot be discharged, forming a hydraulic tappet structure with the brake piston 501, opening the exhaust valve and achieving braking. During each braking cycle, high-pressure oil continues to flow, and the push rod 303 remains downward, unable to open the first connecting passage 207, preventing a reset. After the solenoid valve closes, the oil pressure entering the main oil passage 7 decreases, and the push rod 303 is reset by the push rod spring 305, at which point the engine resumes normal operation.

[0072] An embodiment of the present invention further provides a vehicle comprising the rocker arm brake device of any of the above technical solutions, thus having all the beneficial technical effects of the rocker arm brake device, which will not be described in detail herein.

[0073] Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will appreciate that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features therein may be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the various embodiments of the present invention. In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description. In addition, those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is meant to be within the scope of the present invention and to form different embodiments.

Claims

1. A rocker arm brake device, characterized in that: include: A cam, wherein a braking protrusion and an exhaust protrusion are provided on the cam at intervals along the circumference of the cam; the height of the braking protrusion is smaller than that of the exhaust protrusion; A rocker arm is rotatably connected to the vehicle body via a rocker shaft; the rocker shaft is provided with a plurality of chambers and rollers contacting the cam on both sides thereof; the plurality of chambers include an exhaust chamber, a brake chamber, and a one-way valve chamber; a partition is provided in the exhaust chamber, and a first communication channel is provided on the partition to separate the exhaust chamber into an upper chamber and a lower chamber that are interconnected, the upper chamber being in communication with the brake chamber, and the one-way valve chamber being in communication with the brake chamber; a switch assembly disposed in the exhaust chamber to open and close a first communication passage between the upper chamber and the lower chamber, wherein when the engine is in normal working condition, the switch assembly opens the first communication passage; an exhaust assembly, slidably disposed in the lower chamber and configured to contact the exhaust valve bridge; A first set interval is provided between the exhaust assembly and the partition; a brake assembly disposed in the brake chamber and configured to contact the exhaust valve pin; a one-way valve assembly, disposed in the one-way valve chamber, for opening and closing a second communication passage between the one-way valve chamber and the brake chamber; A main oil passage is provided on the rocker arm shaft, and the main oil passage is communicated with the brake chamber and the lower chamber respectively.

2. The rocker arm brake device according to claim 1, characterized in that: The plurality of cavities further include an oil drain cavity, wherein a side wall of the oil drain cavity is provided with an oil drain port for communicating with the outside; the oil drain cavity is communicated with the main oil passage; The rocker arm brake device further includes an oil drain component, which is disposed in the oil drain chamber to open and close the oil drain port. When the engine is in normal working condition, the oil drain component closes the oil drain port.

3. The rocker arm brake device according to claim 2, characterized in that: An opening is provided at the bottom of the brake chamber; The brake assembly comprises: a brake piston, the brake piston being disposed in the brake chamber, the lower end of the brake piston being able to always contact the exhaust valve pin when the engine is in normal working condition; a brake spring, one end of which is connected to the top of the brake chamber, and the other end of which is connected to the brake piston; A clamping ring is arranged at the opening to limit the lower part of the brake piston.

4. The rocker arm brake device according to claim 1, characterized in that: The top of the brake chamber is provided with a threaded hole, and the bottom of the brake chamber is provided with an opening; The brake assembly comprises: a locking nut, the locking nut being screwed into the threaded hole; an adjusting screw, the upper end of which is connected to the locking nut; A brake piston is disposed in the brake chamber; when the engine is in normal working condition, a second set distance is provided between the brake piston and the exhaust valve pin; A brake spring is connected between the adjusting screw and the brake piston.

5. The rocker arm brake device according to any one of claims 1 to 4, characterized in that: The switch assembly comprises: A blocking member, disposed in the upper cavity; a blocking member spring, disposed in the upper cavity, wherein the blocking member is connected between the inner wall of the upper cavity and the blocking member; a push rod, at least partially located in the lower cavity, with a top portion of the push rod extending into the first communicating channel to contact the blocking member; A push rod valve body is arranged in the lower chamber, and the push rod is connected to the push rod valve body; A push rod spring is connected between the exhaust assembly and the push rod.

6. The rocker arm brake device according to claim 5, characterized in that: The exhaust assembly comprises: a sliding pin, the sliding pin being slidably disposed in the lower cavity, and a first set interval being provided between the sliding pin and the partition; A sliding pin spring is connected between the partition and the sliding pin.

7. The rocker arm brake device according to claim 6, characterized in that: A sliding pin groove is provided at the upper end of the sliding pin, at least part of the push rod valve body is located in the sliding pin groove, the push rod spring is connected between the bottom of the sliding pin groove and the bottom of the push rod valve body; the sliding pin spring is connected between the partition and the push rod valve body.

8. The rocker arm brake device according to any one of claims 1 to 4, characterized in that: An opening is provided at the top of the one-way valve cavity; The check valve assembly includes: A sealing nut, used to seal the opening at the top of the one-way valve cavity; a one-way valve spring, one end of which is connected to the blocking nut; a one-way valve ball, the other end of the one-way valve spring being connected to the one-way valve ball; a gasket disposed at the bottom of the one-way valve cavity, wherein the one-way valve ball is capable of contacting a majority of the gaskets; The connection point between the main oil passage and the one-way valve cavity is located at the bottom of the one-way valve cavity.

9. The rocker arm brake device according to claim 2 or 3, characterized in that: An opening is provided at the top of the oil drain chamber, and a blocking cover is provided at the top opening of the oil drain chamber; The oil drain assembly comprises: an oil drain piston, the oil drain piston being disposed in the oil drain chamber; An oil drain spring, one end of which is connected to the plug cover, and the other end of which is connected to the oil drain piston.

10. A vehicle, characterized in that: The invention comprises a rocker arm brake device as claimed in any one of claims 1 to 9.

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