Rocker arm brake device

Abstract

The invention relates to the technical field of engine braking, in particular to a rocker arm braking device. The rocker arm braking device comprises an air inlet rocker arm assembly and an air inlet cam, a normal air inlet protrusion and a braking air inlet protrusion are arranged on the air inlet cam, and the air inlet rocker arm assembly achieves a first air inlet lift used for opening an air inlet valve structure through the normal air inlet protrusion. The air inlet rocker arm assembly can be used for opening a second air inlet lift of the air inlet valve structure through the brake air inlet protrusion. The brake exhaust cam is provided with a plurality of brake exhaust protrusions arranged in the circumferential direction of the brake exhaust cam at intervals. The brake exhaust rocker arm realizes a plurality of brake exhaust lifts capable of being used for opening the exhaust valve structure through a plurality of brake exhaust bulges; in the engine braking process, at least part of the partial braking exhaust lift can be carried out when the first air inlet lift is carried out, and at least part of the partial braking exhaust lift can be carried out when the second air inlet lift is carried out.

Description

Technical Field

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

[0002] When a vehicle is driving downhill, long-term braking will cause the brakes to overheat, which will affect the brake life over time. In the prior art, a rocker arm brake device is usually used to assist engine braking. High-power braking often uses multiple rocker arm switches or adds auxiliary mechanical structures to control the valve intake volume, which usually requires a large space. Summary of the invention

[0003] The purpose of the present invention is to provide a rocker arm brake device, which can solve the technical problem that the rocker arm brake device in the prior art needs a large space to achieve high-power braking. In some technical solutions, it can also solve the technical problem that the valve lift of some cylinder deactivation rocker arm structures is unstable in the initial stage of engine startup.

[0004] The present invention provides a rocker arm brake device, comprising: an intake rocker arm assembly and an intake cam, the intake cam being provided with a normal intake protrusion and a braking intake protrusion, the normal intake protrusion being higher than the braking intake protrusion; the intake rocker arm assembly realizing a first intake lift for opening an intake valve structure through the normal intake protrusion, and realizing a second intake lift capable of opening the intake valve structure through the braking intake protrusion; a braking exhaust rocker arm assembly and a braking exhaust cam, the braking exhaust cam being provided with a plurality of braking exhaust protrusions spaced along the circumferential direction of the braking exhaust cam; the braking exhaust rocker arm realizing a plurality of braking exhaust lifts capable of opening an exhaust valve structure through a plurality of the braking exhaust protrusions; during engine braking, at least a portion of the braking exhaust lift can be performed when the first intake lift is performed, and at least a portion of the braking exhaust lift can be performed when the second intake lift is performed.

[0005] The rocker arm brake device provided by the present invention can realize the simultaneous braking process on the intake side and the braking process on the exhaust side, and the exhaust side braking process is performed intermittently in multiple processes, which can achieve high-power braking. Compared with the related technology, the same braking power is achieved. The rocker arm shaft brake device provided in this embodiment uses a small number of rocker arm components, which can reduce the space occupied by the entire rocker arm brake device.

[0006] Furthermore, the number of the brake exhaust protrusions is four, and accordingly, the brake exhaust rocker arm assembly realizes four brake exhaust lifts of the exhaust valve structure through multiple brake exhaust protrusions, namely, the first brake exhaust lift, the second brake exhaust lift, the third brake exhaust lift and the fourth brake exhaust lift; during engine braking, at least part of the first brake exhaust lift and at least part of the second brake exhaust lift are performed when the first intake lift is performed; at least part of the second brake exhaust lift and at least part of the fourth brake exhaust lift are performed simultaneously with the second intake lift.

[0007] Further, when the first brake exhaust lift reaches the second half, the first intake lift begins and ends when the second brake exhaust lift reaches the first half; when the third brake exhaust lift reaches the second half, the second intake lift begins and ends when the fourth brake exhaust lift reaches the first half.

[0008] Furthermore, the heights of the plurality of brake exhaust protrusions are equal; or, the heights of the plurality of brake exhaust protrusions are not equal; or, the heights of some of the plurality of brake exhaust protrusions are equal. Furthermore, the tops of the four brake exhaust protrusions are all arranged in an arc shape; or, the tops of the four brake exhaust protrusions are all arranged in a straight shape; or, among the four brake exhaust protrusions, the tops of some of the brake exhaust protrusions are arranged in an arc shape, and the tops of other parts of the brake exhaust protrusions are arranged in a straight shape.

[0009] Further, the intake rocker arm assembly includes: an intake rocker arm, which is used to be rotatably connected to the cylinder body through an intake shaft; the intake rocker arm is provided with a first intake piston chamber, a second intake piston chamber and a one-way valve chamber on one side of the intake shaft; the first intake piston chamber includes an intake upper chamber and an intake lower chamber, and the intake upper chamber and the intake lower chamber are connected through a connecting passage; the intake rocker arm is provided with a first intake oil passage, a second intake oil passage and a third intake oil passage, all of which are connected to the one-way valve chamber, the first intake oil passage is used for oil intake, the second intake oil passage is connected to the intake lower chamber, and the third intake oil passage is connected to the second intake piston chamber; the intake rocker arm is also provided with an intermediate oil passage connecting the intake upper chamber and the second intake piston chamber, and the intermediate oil passage is also connected to the second intake piston chamber; an intake roller is rotatably arranged on the intake rocker arm on the other side of the intake shaft; the piston one-way valve assembly includes an upper chamber elastic member and an upper chamber blocking member, The upper chamber elastic member is connected between the top of the upper air intake chamber and the upper chamber blocking member; the first piston assembly includes a first piston, an air intake push rod and a first piston elastic member; the first piston is slidably arranged in the lower air intake chamber, the air intake push rod is connected to the first piston, and the first piston elastic member is connected between the air intake push rod and the bottom of the upper air intake chamber; in an initial state, there is a set interval between the first piston and the bottom of the upper air intake chamber; the second piston assembly includes a second piston and a second piston elastic member; the second piston is slidably arranged in the second air intake piston chamber, and the second piston elastic member is connected between the second air intake piston chamber and the second piston; the one-way valve assembly includes: a one-way switch member and a one-way elastic member, the one-way elastic member is connected between the one-way valve chamber and the one-way switch member; the one-way switch is slidably arranged in the one-way valve chamber to be able to switch the first connecting port between the third air intake oil channel and the one-way valve chamber.

[0010] Furthermore, a pressure regulating chamber and a fourth intake oil passage are provided on the intake rocker arm; the fourth intake oil passage is connected between the one-way valve chamber and the pressure regulating chamber; the intake rocker arm assembly also includes: a pressure regulating assembly, including a pressure regulating valve core and a pressure regulating elastic member, the pressure regulating elastic member is connected between the pressure regulating valve core and the pressure regulating chamber; the pressure regulating valve core is slidably arranged in the pressure regulating chamber to be able to switch the second connecting port between the fourth intake oil passage and the pressure regulating chamber.

[0011] Furthermore, the first intake piston chamber and the second intake piston chamber are arranged at the end of the intake rocker arm away from the roller; the one-way valve chamber and the pressure regulating chamber are located in the middle of the intake rocker arm; the length direction of the one-way valve chamber is the same as the thickness direction of the intake rocker arm, and the length direction of the pressure regulating chamber is the same as the length direction of the intake rocker arm.

[0012] Furthermore, the rocker arm brake device also includes a normal exhaust rocker arm assembly and a normal exhaust cam; the normal exhaust rocker arm includes: a normal exhaust rocker arm shaft and a normal exhaust rocker arm, the normal exhaust rocker arm is rotatably arranged on the cylinder body through the normal exhaust rocker arm shaft, a normal exhaust roller is provided at one end of the normal exhaust rocker arm, the normal exhaust roller can move along the peripheral wall of the normal exhaust cam, and a normal exhaust control chamber and a normal exhaust piston chamber are provided on the side of the normal exhaust rocker arm shaft away from the normal exhaust roller; a set amount of fluid can be retained in the normal exhaust piston chamber to enable the normal exhaust piston assembly to open the normal exhaust valve structure.

[0013] Furthermore, the normal exhaust rocker arm shaft is provided with a first normal exhaust shaft oil passage and a second normal exhaust shaft oil passage; the normal exhaust rocker arm is provided with a first normal exhaust oil passage, a second normal exhaust oil passage, a third normal exhaust oil passage and a fourth normal exhaust oil passage; the first normal exhaust oil passage is connected to the first normal exhaust shaft oil passage, and the second normal exhaust oil passage is connected to the second normal exhaust shaft oil passage; the normal exhaust control chamber includes a first normal exhaust chamber and a second normal exhaust chamber connected through a normal exhaust connecting port; the normal exhaust rocker arm assembly also includes a normal exhaust control mechanism, the normal exhaust control mechanism includes a normal exhaust elastic control member arranged in the first normal exhaust chamber and a normal exhaust push rod arranged in the second normal exhaust chamber; the normal exhaust elastic control member can open and close the normal exhaust connecting port; the first normal exhaust oil passage is connected to the part of the second normal exhaust chamber close to the normal exhaust connecting port, and the The second normal exhaust oil passage is connected with the part of the second normal exhaust chamber away from the normal exhaust connecting port, so as to provide oil to push the normal exhaust push rod to lift the normal exhaust elastic control part; the third normal exhaust oil passage is connected between the first normal exhaust chamber and the normal exhaust piston chamber, and the fourth normal exhaust oil passage is connected between the second normal exhaust chamber and the normal exhaust piston chamber; the normal exhaust rocker arm assembly also includes a normal exhaust piston mechanism, and the exhaust piston mechanism includes a normal exhaust piston and a normal exhaust piston reset member; a normal exhaust mounting chamber for mounting the normal exhaust piston reset member is provided on the normal exhaust piston, and a normal exhaust groove connected to the normal exhaust mounting chamber is provided on the outer wall of the normal exhaust piston; the normal exhaust piston can move in the normal exhaust piston chamber, and the normal exhaust groove can be connected with the fourth normal exhaust oil passage while following the movement of the normal exhaust piston.

[0014] The present invention provides a vehicle, comprising an intake valve structure, an exhaust valve structure and the above-mentioned rocker arm brake device, wherein the intake rocker arm assembly can contact with the intake valve structure, and the exhaust valve structure can contact with the exhaust valve structure.

[0015] It should be understood that both the foregoing general description and the following specific embodiments are for the purpose of example and illustration and do not necessarily limit 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. At the same time, the specification and the drawings are used 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 present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0018] Figure 2 for Figure 1 A schematic diagram of the structure of an intake rocker arm assembly in a rocker arm brake device shown;

[0019] Figure 3 for Figure 2 A top view of the intake rocker arm assembly is shown;

[0020] Figure 4 for Figure 3 A cross-sectional view of the intake rocker arm assembly at AA is shown;

[0021] Figure 5 for Figure 3 A cross-sectional view of the intake rocker arm assembly BB is shown;

[0022] Figure 6 for Figure 3 The cross-sectional view of the intake rocker arm assembly CC shown;

[0023] Figure 7 for Figure 1 A schematic diagram of the structure of a brake exhaust rocker arm assembly in a rocker arm brake device shown;

[0024] Figure 8 for Figure 1 A schematic diagram of the structure of a normal exhaust rocker arm assembly in a rocker arm brake device shown;

[0025] Fig. 9 for Figure 8 The schematic diagram of the normal exhaust rocker arm assembly failure state shown;

[0026] Fig.10 for Figure 8 The schematic diagram of a normal exhaust rocker arm assembly shown is normal;

[0027] Fig.11 It is the intake lift and exhaust lift curve diagram during the braking process of the rocker arm brake device.

[0028] icon:

[0029] 1-intake rocker arm assembly; 11-intake rocker arm; 12-intake shaft; 13-intake roller; 14-piston check valve assembly; 15-first piston assembly; 16-second piston assembly; 17-check valve assembly; 18-pressure regulating assembly; 111-intake upper chamber; 112-intake lower chamber; 113-second intake piston chamber; 114-check valve chamber; 115-first intake oil passage; 116-second intake oil passage; 117-third intake oil passage; 118-middle oil passage; 119-fourth intake oil passage; 1110-pressure regulating chamber; 121-intake shaft oil passage; 141-upper chamber elastic member; 14 2-upper cavity plugging member; 143-first adjusting screw; 144-connecting channel; 145-first screw plug; 151-first piston; 152-intake push rod; 153-first piston elastic member; 161-second piston; 162-second piston elastic member; 163-second adjusting screw; 164-nut; 171-one-way switch member; 172-one-way elastic member; 173-gasket; 174-second screw plug; 181-pressure regulating valve core; 182-pressure regulating elastic member; 183-circlip; 184-gasket; 185-oil drain port; 1141-one-way valve installation cavity; 1142-connecting cavity;

[0030] 2-intake cam; 21-normal intake cam; 22-brake intake cam;

[0031] 3-brake exhaust rocker arm assembly; 31-brake exhaust control chamber; 32-brake exhaust control rod chamber; 33-brake exhaust upper plug; 34-brake exhaust control spring; 35-brake exhaust control member; 36-brake exhaust control connection port; 37-brake exhaust control rod; 38-brake exhaust rod spring; 39-brake exhaust annular boss; 310-first brake exhaust oil passage; 311-second brake exhaust oil passage; 312-third brake exhaust oil passage; 313-first brake exhaust shaft oil passage; 314-second brake exhaust shaft oil passage; 315-brake exhaust piston; 316-brake exhaust spring;

[0032] 4-brake exhaust cam; 41-first brake exhaust cam; 42-second brake exhaust cam; 43-third brake exhaust cam; 44-fourth brake exhaust cam;

[0033] 5-Normal exhaust rocker arm assembly; 52-Normal exhaust rocker arm shaft; 53-Normal exhaust rocker arm; 54-Normal exhaust roller; 55-Normal exhaust control mechanism; 56-Normal exhaust piston mechanism; 57-Normal exhaust adjustment bolt; 58-Normal exhaust lower plug; 59-Normal exhaust valve contact; 521-First normal exhaust shaft oil passage; 522-Second normal exhaust shaft oil passage; 531-First normal exhaust oil passage; 532-Second normal exhaust oil passage; 533-Third normal exhaust oil passage; 534-Fourth normal exhaust oil passage; 535- Normal exhaust first chamber; 536-normal exhaust second chamber; 5361-normal exhaust upper chamber; 5362-normal exhaust lower chamber; 537-normal exhaust piston chamber; 551-normal exhaust top rod; 5511-normal exhaust rod; 5512-normal exhaust base; 5513-normal exhaust protrusion; 552-normal exhaust spring; 553-normal exhaust blocking ball; 554-normal exhaust control reset member; 561-normal exhaust piston; 562-normal exhaust piston reset member; 63-normal exhaust installation chamber; 64-normal exhaust groove;

[0034] 6-Normal exhaust cam; 61-Normal exhaust cam;

[0035] 7-intake valve structure; 71-socket; 72-intake valve pin;

[0036] 8-Brake exhaust valve structure;

[0037] 101 - first intake lift; 102 - second intake lift; 103 - first brake exhaust lift; 104 - second brake exhaust lift; 105 - third brake exhaust lift; 106 - fourth brake exhaust lift. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0039] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various 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 merely represents selected embodiments of the present invention.

[0040] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0044] like Figures 1 to 11 As shown, the present invention provides a rocker arm brake device, including: an intake rocker arm assembly 1 and an intake cam 2, the intake cam 2 is provided with a normal intake protrusion 21 and a braking intake protrusion 22, the normal intake protrusion 21 is higher than the braking intake protrusion 22; the intake rocker arm assembly 1 realizes a first intake lift 101 for opening the intake valve structure 7 through the normal intake protrusion 21, and the intake rocker arm assembly 1 realizes a second intake lift 102 for opening the intake valve structure 7 through the braking intake protrusion 22; a braking exhaust rocker arm assembly 3 and a braking exhaust cam 4, the braking exhaust cam 4 is provided with a plurality of braking exhaust protrusions spaced along the circumferential direction of the braking exhaust cam 4; the braking exhaust rocker arm realizes a plurality of braking exhaust lifts for opening the braking exhaust valve structure 8 through a plurality of braking exhaust protrusions 39; during engine braking, at least a portion of the partial braking exhaust lift can be performed when the first intake lift 101 is performed, and at least a portion of the partial braking exhaust lift can be performed when the second intake lift 102 is performed.

[0045] In this embodiment, the intake rocker arm assembly 1 can contact the intake valve structure 7 (which may include the intake valve, the intake valve pin 72, etc.) to enable the intake valve structure 7 to be opened, and the brake exhaust rocker arm assembly 3 can contact the brake exhaust valve structure 8 (which may include the socket 71, the exhaust valve, the exhaust valve pin, etc., Figure 7Only a partial structure of the exhaust valve structure is shown) to enable the brake exhaust valve structure 8 to open.

[0046] It can be known that the intake rocker arm assembly 1 includes an intake roller 13, which is located at the first end of the intake rocker arm assembly 1 and is used to contact the intake cam 2, and the second end of the intake rocker arm assembly 1 is used to contact the intake valve structure 7; the brake exhaust rocker arm assembly 3 includes a brake exhaust roller, which is located at the first end of the brake exhaust rocker arm assembly 3 and is used to contact the brake exhaust cam 4, and the second end of the brake exhaust rocker arm assembly 3 is used to contact the brake exhaust cam 4.

[0047] When the engine needs to brake, the rocker brake assembly turns on the braking mode, the intake roller 13 in the intake rocker assembly 1 moves relatively along the intake cam 2, and the brake exhaust roller of the brake exhaust rocker assembly 3 moves relatively along the brake exhaust cam 4. During the contact between the intake roller 13 and the normal intake protrusion 21, the second end of the intake rocker assembly 1 realizes the first intake lift 101, which can realize the normal opening of the intake valve structure 7 and the normal intake of the engine; the brake exhaust roller moves along the brake exhaust protrusion 39 to realize the process of the second end of the brake exhaust rocker assembly 3 performing the brake exhaust lift, which is at least partially carried out simultaneously with the process of the second end of the intake rocker assembly 1 realizing the first intake lift 101; the second end of the brake exhaust rocker assembly 3 realizes opening of the brake exhaust valve structure 8 before the normal exhaust of the engine to exhaust in advance and thus realize braking.

[0048] The intake roller 13 in the intake rocker arm assembly 1 continues to move relatively along the intake cam 2, and the brake exhaust roller of the brake exhaust rocker arm assembly 3 continues to move relatively along the brake exhaust cam 4. During the contact between the intake roller 13 and the brake intake protrusion 22, the second end of the intake rocker arm assembly 1 realizes the second intake lift 102, which can realize the opening of the intake valve structure 7 before normal intake, increase the energy consumption of the engine, thereby reducing the output power of the engine and realizing braking; the brake exhaust roller continues to move along the brake exhaust protrusion 39 to realize the process of the second end of the brake exhaust rocker arm assembly 3 performing the brake exhaust lift again, so as to open the brake exhaust valve structure 8 before normal exhaust again, thereby realizing braking again, and this process is at least partially carried out simultaneously with the process of the second end of the intake rocker arm assembly 1 realizing the second intake lift 102.

[0049] The rocker arm brake device provided in this embodiment can realize the simultaneous braking process of the intake side and the exhaust side, and the exhaust side braking process is performed intermittently in multiple processes, which can realize high-power braking (which can be obtained through calculation data analysis). Compared with the related art, the rocker arm shaft brake device provided in this embodiment uses a small number of rocker arm components to achieve the same braking power, which can reduce the occupied space of the entire rocker arm brake device. For example, the rocker arm brake device of the prior art uses four rockers to achieve the braking requirements, while the rocker arm brake device provided in the embodiment of the present invention uses three rockers to achieve the same braking requirements.

[0050] Based on the above embodiments, the number of exhaust brake protrusions may be two, three, five, etc.

[0051] As an optional scheme, the number of brake exhaust protrusions 39 is four. Accordingly, the brake exhaust rocker arm assembly 3 realizes four brake exhaust lifts of the brake exhaust valve structure 8 through multiple brake exhaust protrusions 39, namely the first brake exhaust lift 103, the second brake exhaust lift 104, the third brake exhaust lift 105 and the fourth brake exhaust lift 106; during the engine braking process, at least part of the first brake exhaust lift 103 and at least part of the second brake exhaust lift are performed when the first intake lift 101 is performed; at least part of the second brake exhaust lift 104 and at least part of the fourth brake exhaust lift 106 are performed simultaneously with the second intake lift 102.

[0052] In this embodiment, the number of the brake exhaust protrusions 39 is four, which can not only ensure high-power braking, but also facilitate processing and simplify the control process.

[0053] Specifically, Fig.11 As shown, when the first brake exhaust lift 103 reaches the second half, the first intake lift 101 starts and ends when the second brake exhaust lift 104 reaches the first half; when the third brake exhaust lift 105 reaches the second half, the second intake lift 102 starts and ends when the fourth brake exhaust lift 106 reaches the first half.

[0054] Based on the above embodiment, the heights of multiple brake exhaust protrusions are equal; or, the heights of multiple brake exhaust protrusions are equal; or, the heights of some of the multiple brake exhaust protrusions are equal. The height and phase of the exhaust protrusion 39 can be designed and adjusted as needed, and can be adjusted according to other conditions of the engine to match the required braking power.

[0055] On the basis of the above embodiment, further, the tops of the four brake exhaust protrusions are all arranged in an arc shape (that is, the tops of the brake exhaust protrusions are arc surfaces).

[0056] Alternatively, the tops of the four brake exhaust protrusions are all arranged flat (that is, the tops of the brake exhaust protrusions are flat).

[0057] Alternatively, among the four brake exhaust protrusions, the tops of some of the brake exhaust protrusions are arranged in an arc shape, and the tops of other parts of the brake exhaust protrusions are arranged straight, for example: Figure 7 and Fig.11 As shown, the four brake exhaust protrusions are respectively a first brake exhaust protrusion 41, a second brake exhaust protrusion 42, a third brake exhaust protrusion 43 and a fourth brake exhaust protrusion 44; the first brake exhaust protrusion 41, the second brake exhaust protrusion 42, the third brake exhaust protrusion 43 and the fourth brake exhaust protrusion 44 are arranged in sequence; the tops of the first brake exhaust protrusion 41 and the fourth brake exhaust protrusion 44 are arranged in an arc shape, and the tops of the second brake exhaust protrusion 42 and the third brake exhaust protrusion 43 are arranged in a flat shape.

[0058] In this embodiment, the curve shape of the first brake lift is substantially the same as the shape of the first brake protrusion, the curve shape of the second brake lift is substantially the same as the shape of the second brake protrusion, the curve shape of the third brake lift is substantially the same as the shape of the third brake protrusion, and the curve shape of the fourth brake lift is substantially the same as the shape of the fourth brake protrusion. The tops of the first brake exhaust protrusion 41 and the fourth brake exhaust protrusion 44 are arranged in an arc shape, and correspondingly, the tops of the first brake lift and the fourth brake lift are arranged in an arc shape, and the tops of the second brake exhaust protrusion 42 and the third brake exhaust protrusion 43 are arranged in a plane, and the tops of the corresponding second brake lift and the third brake lift have a straight flat section.

[0059] The specific structure of the brake exhaust protrusion and the length of the top arc surface or the length of the plane can be set according to specific needs and specific phases.

[0060] On the basis of the above-mentioned embodiment, further, the structural form of the intake rocker arm 11 shaft assembly can be various as long as the intake braking can be achieved.

[0061] As an alternative, Figures 2 to 6As shown, the intake rocker arm assembly 1 includes: an intake rocker arm 11, which is rotatably connected to the cylinder body through an intake shaft 12; a first intake piston chamber, a second intake piston chamber 113 and a one-way valve chamber 114 are provided on one side of the intake rocker arm 11 located on the intake shaft 12; the first intake piston chamber includes an intake upper chamber 111 and an intake lower chamber 112, and the intake upper chamber 111 and the intake lower chamber 112 are connected through a connecting passage 144; a first intake oil passage 115, a second intake oil passage 116 and a third intake oil passage 117 are provided on the intake rocker arm 11, all of which are connected to the one-way valve chamber 114, the first intake oil passage 115 is used for oil intake, and the second intake oil passage 116 is used for oil intake. 16 is connected to the intake lower chamber 112, and the third intake oil passage 117 is also connected to the second intake piston chamber 113; the intake rocker arm 11 is also provided with an intermediate oil passage 118 connecting the second intake piston chamber 113 and the intake upper chamber 111 (optionally, the third intake oil passage 117 and the intermediate oil passage 118 are one oil passage, and the second intake piston chamber 113 is connected to the oil passage to divide the oil passage into two sections, one section is the third intake oil passage 117, and the other section is the intermediate oil passage 118); the intake roller 13 is rotatably arranged on the other side of the intake rocker arm 11 located at the intake shaft 12; the piston check valve assembly 14 includes an upper chamber elastic member 14 1 and the upper cavity blocking member 142, the upper cavity elastic member 141 is connected between the top of the intake upper cavity 111 and the upper cavity blocking member 142; the first piston assembly 15, including the first piston 151, the intake push rod 152 and the first piston elastic member 153; the first piston 151 is slidably arranged in the intake lower cavity 112, the intake push rod 152 is connected to the first piston 151, and the first piston elastic member 153 is connected between the intake push rod 152 and the bottom of the intake upper cavity 111; in the initial state (without external force, such as no oil, no intake valve structure 7 spring force, no cylinder pressure, etc.), the first piston 151 and the intake upper cavity 111 are connected. There is a set interval between the bottoms of the cavities 111; the second piston assembly 16, comprising a second piston 161 and a second piston elastic member 162; the second piston 161 is slidably disposed in the second intake piston cavity 113, and the second piston elastic member 162 is connected between the second intake piston cavity 113 and the second piston 161; the one-way valve assembly 17, comprising: a one-way switch member 171 and a one-way elastic member 172, the one-way elastic member 172 is connected between the one-way valve cavity 114 and the one-way switch member 171; the one-way switch is slidably disposed in the one-way valve cavity 114 to be able to switch the first connecting port between the third intake oil channel 117 and the one-way valve cavity 114.

[0062] Specifically, an intake shaft oil passage 121 may be provided on the intake shaft 12, the intake shaft oil passage 121 being in communication with the first intake oil passage 115, and an electric control valve (e.g., an electric valve or a solenoid valve, etc.) is provided to control the oil entering the intake shaft oil passage 121, so as to stop the oil supply, supply low-pressure oil, and supply high-pressure oil. The intake valve structure 7 includes a socket seat 71 and an intake valve pin 72 (both of which can realize the opening of the intake valve), the first piston 151 can contact the socket seat 71, and the second piston 161 can contact the intake valve pin 72.

[0063] In this embodiment, when the engine is operating normally, there may be a gap between the intake push rod 152 and the upper cavity blocking member 142. The first piston 151 contacts the socket 71, and the second piston 161 is separated from the intake valve pin 72; the low-pressure oil passes through the solenoid valve, the first intake oil passage 115, the one-way valve chamber 114, the second intake oil passage 116, the intake lower chamber 112, the connecting passage 144, the intake upper chamber 111, the intermediate oil passage 118, and the second intake piston chamber 113 in sequence, and the low-pressure oil lubricates each chamber and its components. When the intake cam 2 rotates until the brake intake protrusion 22 contacts the intake roller 13, because there is a set gap between the first piston 151 and the bottom of the intake upper chamber 111 and the lift generated by the brake intake protrusion 22 is not enough to eliminate the gap, the socket 71 end cannot open the valve to realize the intake function, and the low-pressure oil in the second intake piston chamber 113 cannot overcome the elastic force of the second piston elastic member 162 to move the second piston 161 downward to contact the intake valve pin 72, that is, the brake intake cam 2 cannot open the intake valve. When the intake cam 2 rotates to the normal intake protrusion 21 and the intake roller 13, the valve lift is relatively large at this time. After filling the reserved gap, the socket 71 end still has enough valve lift to make the intake valve move, thereby opening the intake valve to realize normal intake action. The valve lift curve is as shown in Fig.11 The first intake lift 101 in.

[0064] When the brake function is turned on, the high-pressure oil enters the intake shaft oil passage 121, the first intake oil passage 115, and the one-way valve chamber 114 under the action of the solenoid valve; after the high-pressure oil enters the one-way valve chamber 114, it acts on the one-way switch member 171 to overcome the one-way elastic member 172, so that the one-way switch member 171 opens the first connecting port between the one-way valve chamber 114 and the third intake oil passage 117 (when the engine is in normal working condition, the one-way switch member 171 closes the first connecting port), and the high-pressure oil enters the third intake oil passage 114. The oil passes through the oil passage 117, and then enters the second intake piston chamber 113, and then enters the intake upper chamber 111 through the intermediate oil passage 118. The high-pressure oil presses the upper chamber plugging member 142 against the bottom of the intake upper chamber 111 to block the connecting passage 144. The intake upper chamber 111 and the second intake piston chamber 113 are both filled with high-pressure oil, and a sealed chamber is formed in the intake upper chamber 111 and the second intake piston chamber 113, forming a hydraulic tappet structure with the second piston 161, and the second piston 161 contacts the intake valve pin 72. At this time, when the intake cam 2 rotates until the brake intake protrusion 22 contacts the intake roller 13, the lift of the brake intake protrusion 22 is the lift of the second piston 161. Fig. 9 In the second intake lift 102, the lift of the brake intake protrusion 22 is not enough to make up the gap between the first piston 151 and the bottom of the intake upper chamber 111. The lift of the second piston 161 is the lift of the socket 71, which can open the intake valve. The intake valve lift curve is as shown in FIG. Fig. 9 The second intake lift 102 in FIG.

[0065] Specifically, the piston one-way valve assembly 14 also includes a first adjusting screw 143 installed in the cavity of the first piston 151, and a cavity is formed in the first adjusting screw 143, which forms the upper air intake cavity 111; the upper part of the first adjusting screw 143 is open to facilitate the installation of the upper cavity elastic member 141 and the upper cavity blocking member 142; a connecting channel 144 is provided on the bottom of the first adjusting screw 143; a first screw plug 145 is provided on the upper part of the first adjusting screw 143 to block the cavity.

[0066] As an alternative, Figure 4 As shown, a mounting groove is provided in the first piston 151, and the air intake push rod 152 is fixed in the mounting groove. The first piston elastic member 153 (for example: a spring) is connected to the bottom of the air intake push rod 152 and the first adjusting screw 143. The air intake push rod 152 can extend out of the mounting groove to extend into the connecting channel 144, but there is a gap between the air intake push rod 152 and the upper cavity blocking member 142.

[0067] The upper cavity blocking member 142 may be a block structure or a plate structure. Optionally, the upper cavity blocking member 142 is a blocking ball, which can enable a portion of the upper cavity blocking member 142 to be located in the connecting channel 144 .

[0068] As an alternative, Figure 4 As shown, the second intake piston chamber 113 is arranged through the intake rocker arm 11, and the second piston assembly 16 also includes a second adjusting screw 163 installed in the second intake piston chamber 113. The second piston 161 is provided with a connecting chamber, and the lower end of the second adjusting screw 163 extends into the connecting chamber. The second piston elastic member 162 is connected between the second adjusting screw 163 and the connecting chamber, and the upper end of the second adjusting screw 163 is connected to the intake rocker arm 11 through a nut 164.

[0069] As an alternative, Figure 6 As shown, the one-way valve assembly 17 further includes a gasket 173 and a second screw plug 174. The gasket 173 is disposed in the one-way valve chamber 114 to divide the one-way valve chamber 114 into a one-way valve installation chamber 1141 and a communication chamber 1142. A third communication port communicating between the first air intake oil passage 115 and the one-way valve chamber 114 and a fourth communication port communicating between the second air intake oil passage 116 and the one-way valve chamber 114 are disposed in the communication chamber 1142. A through hole is disposed on the gasket 173, and the second screw plug 174 is disposed at the opening of the one-way valve installation chamber 1141. The one-way valve elastic member (e.g., a spring) is connected to the second screw plug 174 and the one-way switch member 171, and the one-way switch member 171 (preferably a steel ball) can close and open the through hole.

[0070] like Figures 2 to 6 As shown, on the basis of the above embodiment, further, a pressure regulating chamber 1110 and a fourth intake oil passage 119 are provided on the intake rocker arm 11; the fourth intake oil passage 119 is connected between the one-way valve chamber 114 and the pressure regulating chamber 1110; the intake rocker arm assembly 1 also includes: a pressure regulating assembly 18, including a pressure regulating valve core 181 and a pressure regulating elastic member 182, the pressure regulating elastic member 182 is connected between the pressure regulating valve core 181 and the pressure regulating chamber 1110; the pressure regulating valve core 181 is slidably arranged in the pressure regulating chamber 1110, so as to be able to switch the second connecting port between the fourth intake oil passage 119 and the pressure regulating chamber 1110.

[0071] In this embodiment, during each brake cycle resetting process, the force of the valve on the first piston 151 increases the oil pressure of the high-pressure oil in the lower intake chamber 112, and the high-pressure oil flows through the connecting channel 144, the upper intake chamber 111, the intermediate oil channel 118, the second intake piston chamber 113, the third intake oil channel 117, and the one-way valve installation chamber 1141 of the one-way valve chamber 114 in sequence. The oil enters the connecting chamber 1142 through the one-way valve installation chamber 1141, and then enters the pressure regulating chamber 1110 and the first intake oil channel 115. Since the oil pressure in the pressure regulating chamber 1110 is relatively high at this time, the pressure regulating valve core 181 moves away from the second connecting port, and a part of the oil is absorbed in the pressure regulating chamber 1110.

[0072] As an alternative, Figure 6As shown, a second communication port is provided at one end of the pressure regulating chamber 1110, and the other end of the pressure regulating chamber 1110 is open to realize the installation of the pressure regulating assembly 18, a retaining spring 183 is provided at the open end of the pressure regulating chamber 1110, a gasket 184 is provided inside the retaining spring 183, and a pressure regulating elastic member 182 (for example, a spring) is connected between the gasket 184 and the pressure regulating valve core 181. Preferably, a groove is provided on the pressure regulating valve core 181, and part of the pressure regulating elastic member 182 can be located in the groove, so that the volume of the pressure regulating chamber 1110 can be small.

[0073] An oil drain port 185 connected to the outside can be set in the pressure regulating chamber 1110. When the oil pressure increases to a certain value, the oil pushes the pressure regulating valve core 181 to move away from the second connecting port until the oil drain port 185 is opened. The oil can flow to the outside through the oil unloading port to discharge the oil and reduce the oil pressure.

[0074] Based on the above embodiment, in each braking cycle (which can also be understood as the process in which the intake roller 13 moves along the intake protrusion), when the braking is completed and the intake roller 13 reaches a certain position of the brake intake protrusion 22 (for example, before the highest point of the brake intake protrusion), under the action of the valve spring force and the cylinder pressure, the first piston 151 moves toward the bottom of the upper intake chamber 111 to squeeze the oil, thereby increasing the oil pressure. The oil can flow back into the pressure regulating chamber 1110 through the lower intake chamber 112, the second intake oil channel 116, the one-way valve chamber 114 and the fourth intake oil channel 119. At this time, the oil can open the pressure regulating assembly 18 to be discharged from the oil drain port 185. The air intake push rod 152 moves upward with the first piston 151 to abut against the upper cavity blocking member 142, and then pushes the upper cavity blocking member 142 open, so that the air intake upper cavity 111 and the air intake lower cavity 112 are connected, the seal of the first air intake piston cavity fails, and the high-pressure oil flows back in the reverse direction. At the same time, the high-pressure oil also leaks to the outside from the gap between each piston and the hole wall. This process realizes the reset process.

[0075] After the reset process is completed, the oil intake stage begins (after the intake roller 13 passes the highest point of the brake intake protrusion 22). The first piston 151 moves down and close to the socket 71 under the action of the first piston elastic member 153. At this time, the volume in the intake lower chamber 112 of the first intake piston chamber increases and the oil pressure decreases. The high-pressure oil can enter the intake upper chamber 111 and the intake lower chamber 112 through the first intake oil channel 115, the one-way valve chamber 114, the second intake oil channel 116, the third intake oil channel 117, the second intake piston chamber 113 and the middle oil channel 118 again. The upper chamber blocking member 142 blocks the connecting channel 144 again, and the space between the first piston 151 and the bottom of the intake upper chamber 111 is filled with oil again, so that the first piston 151 is tightly attached to the socket 71. After the solenoid valve is closed, the oil pressure entering the cavity of the first piston 151 decreases, and the first piston 151 drives the intake push rod 152 to push open the upper cavity blocking member 142 again under the action of the valve spring force. The intake upper cavity 111 and the intake lower cavity 112 are connected, and the oil flows back in the opposite direction and leaks out from the gap at the same time. At this time, the engine resumes normal operation.

[0076] like Figure 1 and Figure 7As shown, specifically, the brake exhaust rocker arm assembly 3 also includes a brake exhaust control chamber 31 arranged on the brake exhaust rocker arm and a brake exhaust control rod chamber 32 connected to the brake exhaust control chamber 31 (optionally, the brake exhaust control chamber 31 is arranged above the brake exhaust control rod chamber 32); the upper end of the brake exhaust control chamber 31 passes through the brake exhaust rocker arm, and a brake exhaust upper plug 33 is arranged at the upper end opening of the brake exhaust control chamber 31, and a brake exhaust control spring 34 and a brake exhaust control component 35 (for example: a steel ball) are arranged in the brake exhaust cavity, and the brake exhaust control spring 34 is connected between the brake exhaust upper plug 33 and the brake exhaust control component 35, and the brake exhaust control component 35 controls the brake exhaust control connecting port 36 between the brake exhaust control chamber 31 and the brake exhaust control rod chamber 32. A brake exhaust control rod 37 and a brake exhaust rod spring 38 are provided in the brake exhaust control rod chamber 32; a brake exhaust annular boss 39 is provided on the side wall of the brake exhaust control rod 37, and the brake exhaust annular boss 39 contacts the inner wall of the brake exhaust control rod chamber 32 to separate the brake exhaust control rod chamber 32 into a brake exhaust upper rod chamber and a brake exhaust lower rod chamber. The brake exhaust upper rod chamber can be a step chamber, and the cross-sectional area of ​​the part close to the brake exhaust control connecting port 36 is larger than the cross-sectional area of ​​the other part. The brake exhaust rod spring 38 is connected between the step and the brake exhaust annular boss 39. The brake exhaust rocker arm is also provided with a first brake exhaust oil passage 310 connected to the brake exhaust lower rod chamber and a second brake exhaust oil passage 311 connected to the brake exhaust upper rod chamber, and the brake exhaust control chamber 31 and the brake exhaust piston 315 chamber are connected through the third brake exhaust oil passage 312. The brake exhaust rocker arm is rotatably connected to the cylinder body through the brake exhaust shaft, and a first brake exhaust shaft oil passage 313 connected to the first brake exhaust oil passage 310 and a second brake exhaust shaft oil passage 314 connected to the second brake exhaust oil passage 311 are provided on the brake exhaust shaft. The brake exhaust piston 315 assembly includes a brake exhaust piston 315 and a brake exhaust spring 316, and the brake exhaust spring 316 is connected between the top of the brake exhaust piston 315 cavity and the brake exhaust piston 315. In the initial device (without external force), the brake exhaust spring 316 presses the brake exhaust piston 315 to contact the brake exhaust valve structure 8, and there is a certain gap between the top of the brake exhaust piston 315 and the top of the brake exhaust piston 315 cavity.

[0077] A solenoid valve (the solenoid valve may include an inlet, an outlet and a drain) is provided to control the oil flow of the second brake exhaust shaft oil passage 314. The first brake exhaust oil passage 310 may always maintain the supply of oil.

[0078] In this embodiment, when the engine is working normally, the brake exhaust rocker arm assembly 3 is in a failed state. At this time, the brake exhaust rod spring 38 pushes the brake exhaust control rod 37 upward and overcomes the normal brake exhaust control spring 34 to push open the brake exhaust control component 35. The solenoid valve controls to stop supplying oil to the second brake exhaust shaft oil channel 314, and the first brake exhaust oil channel 310 is always supplied with oil, so that the first brake exhaust oil channel 310, the brake exhaust upper rod chamber, the brake exhaust control chamber 31, the third brake exhaust oil channel 312 and the brake exhaust piston 315 chamber are connected, and the oil can enter the first brake exhaust shaft oil channel 313 and be discharged, causing the brake exhaust piston 315 assembly to fail.

[0079] When the brake function is turned on, the solenoid valve controls the oil to enter the second brake exhaust shaft oil passage 314, and the oil enters the brake exhaust upper rod chamber through the second brake exhaust oil passage 311, and together with the first brake exhaust oil passage 310, pushes the brake exhaust control rod 37 downward, and the brake exhaust control member 35 is closed under the downward thrust of the brake exhaust control spring 34, and the brake exhaust control chamber 31, the third brake exhaust oil passage 312 and the brake exhaust piston 315 chamber form a closed chamber. When the brake exhaust roller contacts the brake exhaust protrusion 39, the brake exhaust piston 315 opens the brake exhaust valve structure 8 to achieve braking.

[0080] like Figure 1 and Figure 8 As shown, on the basis of the above embodiment, further, the rocker arm brake device also includes: a normal exhaust rocker arm assembly 5 and a normal exhaust cam 6, and the normal exhaust cam 6 is provided with a normal exhaust protrusion 61; the normal exhaust rocker arm assembly 5 includes: a normal exhaust rocker arm shaft 52 and a normal exhaust rocker arm 53; the normal exhaust rocker arm 53 is rotatably arranged on the cylinder body through the normal exhaust rocker arm shaft 52, and a normal exhaust roller 54 is provided at one end of the normal exhaust rocker arm 53, and the normal exhaust roller 54 can move along the peripheral wall of the normal exhaust cam 6, and a normal exhaust control chamber and a normal exhaust piston chamber 537 are provided on the side of the normal exhaust rocker arm shaft 52 away from the normal exhaust roller 54 of the normal exhaust rocker arm 53; a set amount of fluid can be retained in the normal exhaust piston chamber 537 to enable the normal exhaust piston 561 assembly to open the normal exhaust valve structure.

[0081] In this embodiment, when the engine is in normal working state, the normal exhaust rocker arm assembly 5 works normally and the brake exhaust rocker arm assembly 3 fails; when the engine is in braking state, the normal exhaust rocker arm assembly 5 fails and the brake exhaust rocker arm assembly 3 works.

[0082] like Figures 8 to 10As shown, on the basis of the above embodiment, further, the normal exhaust rocker arm shaft 52 is provided with a first normal exhaust shaft oil passage 521 and a second normal exhaust shaft oil passage 522; the normal exhaust rocker arm 53 is provided with a first normal exhaust oil passage 531, a second normal exhaust oil passage 532, a third normal exhaust oil passage 533 and a fourth normal exhaust oil passage 534; the first normal exhaust oil passage 531 is communicated with the first normal exhaust shaft oil passage 521, and the second normal exhaust oil passage 532 is communicated with the second normal exhaust shaft oil passage 522; the normal exhaust control chamber includes a first normal exhaust chamber and a second normal exhaust chamber connected through a normal exhaust connecting port; the normal exhaust rocker arm assembly 5 also includes a normal exhaust control mechanism 55, and the normal exhaust control mechanism 55 includes a normal exhaust elastic control member arranged in the first normal exhaust chamber and a normal exhaust push rod 551 arranged in the second normal exhaust chamber; the normal exhaust elastic control member can open and close the normal exhaust connecting port; the first normal exhaust oil passage 531 is communicated with the part of the second normal exhaust chamber close to the normal exhaust connecting port, The second normal exhaust oil passage 532 is connected to the part of the second normal exhaust chamber away from the normal exhaust connecting port, so as to provide oil to push the normal exhaust push rod 551 to lift the normal exhaust elastic control member; the third normal exhaust oil passage 533 is connected between the first normal exhaust chamber and the normal exhaust piston chamber 537, and the fourth normal exhaust oil passage 534 is connected between the second normal exhaust chamber and the normal exhaust piston chamber 537; the normal exhaust rocker arm assembly 5 also includes a normal exhaust piston mechanism 56, and the exhaust piston mechanism includes a normal exhaust piston 561 and a normal exhaust piston reset member 562; a normal exhaust installation chamber 63 for installing the normal exhaust piston reset member 562 is provided on the normal exhaust piston 561, and a normal exhaust groove 64 connected to the normal exhaust installation chamber 63 is provided on the outer wall of the normal exhaust piston 561; the normal exhaust piston 561 can move in the normal exhaust piston chamber 537, and the normal exhaust groove 64 can be connected to the fourth normal exhaust oil passage 534 in the process of following the movement of the normal exhaust piston 561.

[0083] In this embodiment, in the initial state, it can also be considered that when the normal exhaust rocker arm 53 is in a failed state, the normal exhaust groove 64 is connected to the fourth normal exhaust oil passage 534. When the valve needs to be opened, the second normal exhaust shaft oil passage 522 is closed, and the first normal exhaust shaft oil is supplied with oil. The oil enters the normal exhaust second chamber 536 through the first normal exhaust oil passage 531. After the oil enters the normal exhaust second chamber 536, a part of it pushes the normal exhaust elastic control part to move away from the normal exhaust connecting port, thereby opening the normal exhaust connecting port, and the oil enters the normal exhaust first chamber 535. Then, this part of the oil enters the normal exhaust piston chamber 537 from the normal exhaust first chamber 535 through the third normal exhaust oil passage 533; at the same time, another part of the oil enters the normal exhaust groove 64 through the fourth normal exhaust oil passage 534, and then enters the normal exhaust installation chamber 63. The oil pushes the normal exhaust piston 561 downward to contact the normal exhaust valve structure (or a normal exhaust valve contact 59 is connected to the lower end of the normal exhaust piston 561, and the normal exhaust valve contact 59 moves with the normal exhaust piston 561. When it moves downward, the normal exhaust valve contact 59 can contact the normal exhaust valve structure), and the normal exhaust groove 64 gradually staggers with the fourth normal exhaust oil passage 534, and the two are no longer connected. When the normal exhaust roller 54 moves along the protrusion of the normal exhaust cam 6, the normal exhaust piston 561 has a tendency to push the normal exhaust valve structure downward to open. The normal exhaust valve structure has a reaction force on the normal exhaust piston 561, which increases the pressure of the oil in the normal exhaust piston chamber 537, and the oil pressure in the normal exhaust first chamber 535 increases. At the same time, coupled with the restoring force of the normal exhaust elastic control member, the normal exhaust elastic control member closes the normal exhaust connection port again. At this time, the normal exhaust first chamber 535, the third normal exhaust oil channel 533 and the normal exhaust piston chamber 537 form a closed space and are filled with oil to form a rigid force transmission structure. Therefore, when the normal exhaust roller 54 moves along the protrusion to the highest point and then to the lowest point, the rising stroke of the normal exhaust roller 54 end is the descending stroke of the normal exhaust piston 561. During this process, the normal exhaust valve can be opened.

[0084] When the normal exhaust rocker arm assembly 5 is in a failed state, oil is supplied to the second normal exhaust shaft oil passage 522 (the first normal exhaust shaft oil passage 521 can still pass oil), overcoming the oil pressure supplied to the first normal exhaust oil passage 531, and the oil enters the normal exhaust second chamber 536 to act on the normal exhaust push rod 551, pushing the normal exhaust push rod 551 to move upward to push open the normal exhaust elastic control member, and the normal exhaust connecting port is opened. The oil in the normal exhaust piston chamber 537, the oil in the third normal exhaust oil passage 533, and the oil in the normal exhaust first chamber 535 can return to the normal exhaust second chamber 536 through the normal exhaust connecting port. The oil in the normal exhaust second chamber 536 near the normal exhaust connecting port can return to the first normal exhaust oil channel 531 and then be discharged. At the same time, under the action of the normal exhaust piston reset member 562 and the effect of oil reduction, the normal exhaust piston 561 is gradually reset. During the reset process of the normal exhaust piston 561, the connection area between the normal exhaust groove 64 and the fourth normal exhaust oil channel 534 is gradually increased. The oil can also enter the normal exhaust second chamber 536 through the normal exhaust groove 64 and the fourth normal exhaust oil channel 534, and then return to the first normal exhaust oil channel 531. Finally, the normal exhaust piston 561 is reset to its initial state.

[0085] During the valve opening process, when the first normal exhaust oil passage 531 just starts to supply oil, the oil can enter the normal exhaust piston chamber 537 from the third normal exhaust oil passage 533 and the fourth normal exhaust oil passage 534. As the normal exhaust piston 561 descends, the connecting area between the fourth normal exhaust oil passage 534 and the normal exhaust groove 64 gradually decreases, and the normal exhaust piston 561 gradually descends slowly, so that the normal exhaust piston 561 descends and seats (contacts the normal exhaust valve structure) slowly and steadily. When the working state of the normal exhaust rocker arm assembly 5 is switched, the state of the normal exhaust piston 561 is different. The normal exhaust rocker arm assembly 5 provided in this embodiment can realize that the normal exhaust piston 561 is either in the initial state or in the maximum downward state, and can avoid the normal exhaust piston 561 from being in the intermediate state between the above two states, that is, avoid the normal exhaust piston 561 from being in the half-lift state.

[0086] It can be understood that the first normal exhaust shaft oil passage 521 can be set to be in a constant oil supply state, and a normal exhaust electric control valve (for example, a solenoid valve or an electric valve, etc.) can be set at the second normal exhaust shaft oil passage 522. The second normal exhaust shaft oil passage 522 can be opened and closed by the normal exhaust electric control valve for easy control.

[0087] A normal exhaust groove 64 in a rectangular, circular or other shape that can communicate with the fourth normal exhaust oil passage 534 can be provided at a certain position on the side wall of the normal exhaust piston 561 .

[0088] As an alternative, Figures 8 to 10 As shown, the normal exhaust groove 64 is a normal exhaust annular groove arranged on the outer wall of the normal exhaust piston 561, which is convenient for processing and also convenient for arranging multiple normal exhaust connecting channels 144 at circumferential intervals along the normal exhaust piston 561. The normal exhaust connecting channels 144 are connected between the normal exhaust groove 64 and the normal exhaust mounting cavity 63.

[0089] As an alternative, Figures 8 to 10 As shown, the flow area of ​​the fourth normal exhaust oil passage 534 at the connection with the normal exhaust groove 64 is smaller than the flow area of ​​the normal exhaust groove 64 at the connection with the fourth normal exhaust oil passage 534 .

[0090] As an alternative, Figure 8 and Fig. 9 As shown, in the initial state, there is a gap between the top of the normal exhaust piston 561 and the top of the normal exhaust piston chamber 537, and the connection point between the third normal exhaust oil channel 533 and the normal exhaust piston chamber 537 corresponds to the gap; the normal exhaust groove 64 is connected to the fourth normal exhaust oil channel 534.

[0091] In this embodiment, in the initial state, the top of the normal exhaust piston 561 is located below the connection between the third normal exhaust oil channel 533 and the normal exhaust piston chamber 537. This arrangement prevents the normal exhaust piston 561 from blocking the third normal exhaust oil channel 533 and preventing oil from entering the normal exhaust piston chamber 537.

[0092] As an alternative, Figures 8 to 10As shown, the normal exhaust second chamber 536 includes a normal exhaust upper chamber 5361 and a normal exhaust lower chamber 5362 that are interconnected; the normal exhaust top rod 551 includes a normal exhaust rod portion 5511, a normal exhaust base portion 5512 and a normal exhaust protrusion portion 5513 that are interconnected; the cross-sectional area of ​​the normal exhaust rod portion 5511 is smaller than the cross-sectional area of ​​the normal exhaust base portion 5512, the normal exhaust rod portion 5511 can contact the normal exhaust elastic control member, and a space is formed between the normal exhaust rod portion 5511 and the normal exhaust upper chamber 5361, so that the oil can easily enter the normal exhaust upper chamber 5361; the side wall of the normal exhaust base portion 5512 can contact the normal exhaust upper chamber 5361 the normal exhaust protrusion 5513 is arranged on the side wall of the normal exhaust base 5512, and the normal exhaust protrusion 5513 is located in the normal exhaust lower chamber 5362, and the side wall of the normal exhaust protrusion 5513 can contact the inner wall of the normal exhaust lower chamber 5362; the second normal exhaust oil passage 532 is connected with the normal exhaust lower chamber 5362, and the connecting point between the second normal exhaust oil passage 532 and the normal exhaust lower chamber 5362 is located on the side of the normal exhaust protrusion 5513 away from the normal exhaust rod 5511, so that the oil can act on the normal exhaust protrusion 5513 after entering the normal exhaust lower chamber 5362, thereby pushing the normal exhaust top rod 551 to rise.

[0093] like Figures 8 to 10 As shown, on the basis of the above embodiment, further, the cross-sectional area of ​​the normal exhaust lower chamber 5362 is greater than the cross-sectional area of ​​the normal exhaust upper chamber 5361, so as to form a step in the normal exhaust second chamber 536; the normal exhaust control mechanism 55 also includes a normal exhaust spring 552, and the normal exhaust spring 552 is connected between the normal exhaust protrusion 5513 and the step. The provision of the normal exhaust spring 552 can facilitate the resetting of the normal exhaust push rod 551.

[0094] like Figures 8 to 10 As shown, based on the above embodiment, further, the normal exhaust elastic control component includes a normal exhaust sealing ball 553 and a normal exhaust control reset component 554, the normal exhaust control reset component 554 is connected between the top of the normal exhaust first chamber 535 and the normal exhaust sealing ball 553, and the normal exhaust sealing ball 553 can open and close the normal exhaust connecting port.

[0095] As an alternative, Figures 8 to 10 As shown, the normal exhaust first chamber 535 is arranged to penetrate the upper part of the normal exhaust rocker arm 53, and the normal exhaust adjusting bolt 57 is arranged on the top of the normal exhaust first chamber 535 to facilitate the assembly of the normal exhaust elastic control part. The normal exhaust adjusting bolt 57 can be arranged to adjust the distance between it and the normal exhaust connecting port, so that the pre-pressure of the normal exhaust control reset part 554 (for example, a spring) can be adjusted.

[0096] As an alternative, Figures 8 to 10 As shown, the normal exhaust second chamber 536 is arranged to penetrate the lower part of the normal exhaust rocker arm 53, and a normal exhaust lower plug 58 is provided at the lower part of the normal exhaust second chamber 536 to facilitate the installation of the normal exhaust push rod 551 and the normal exhaust spring 552.

[0097] The embodiment of the present invention further provides a vehicle, comprising an intake valve structure 7, a brake exhaust valve structure 8 and a rocker arm brake device of any of the above technical solutions, wherein the intake rocker arm assembly 1 can contact the intake valve structure 7, and the brake exhaust valve structure 8 can contact the exhaust valve structure. A normal exhaust valve structure can also be included, and a normal exhaust piston mechanism 56 can open or close the normal exhaust valve structure.

[0098] Therefore, the vehicle has all the beneficial technical effects of the rocker arm brake device, which will not be repeated here.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. In the description provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In some examples, 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 can understand that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means being within the scope of the present invention and forming different embodiments.

Claims

1. A rocker arm brake device, characterized in that: include: An intake rocker arm assembly and an intake cam, wherein the intake cam is provided with a normal intake protrusion and a brake intake protrusion, wherein the normal intake protrusion is higher than the brake intake protrusion; the intake rocker arm assembly realizes a first intake lift for opening an intake valve structure through the normal intake protrusion, and the intake rocker arm assembly realizes a second intake lift for opening the intake valve structure through the brake intake protrusion; A brake exhaust rocker arm assembly and a brake exhaust cam, wherein the brake exhaust cam is provided with a plurality of brake exhaust protrusions spaced apart along the circumferential direction of the brake exhaust cam; The brake exhaust rocker arm realizes a plurality of brake exhaust lifts that can be used to open the exhaust valve structure through a plurality of the brake exhaust protrusions; During engine braking, at least part of the brake exhaust lift can be performed when the first intake lift is performed, and at least part of the brake exhaust lift can be performed when the second intake lift is performed.

2. The rocker arm brake device according to claim 1, characterized in that: The number of the brake exhaust protrusions is four, and accordingly, the brake exhaust rocker arm assembly realizes four brake exhaust lifts of the exhaust valve structure through the multiple brake exhaust protrusions, which are the first brake exhaust lift, the second brake exhaust lift, the third brake exhaust lift and the fourth brake exhaust lift; During engine braking, at least part of the first brake exhaust lift and at least part of the second brake exhaust lift are performed when the first intake lift is performed; at least part of the second brake exhaust lift and at least part of the fourth brake exhaust lift are performed simultaneously with the second intake lift.

3. The rocker arm brake device according to claim 2, characterized in that: When the first brake exhaust lift reaches the second half, the first intake lift starts and ends when the second brake exhaust lift reaches the first half; When the third brake exhaust lift reaches the second half, the second intake lift starts to be performed and ends when the fourth brake exhaust lift reaches the first half.

4. The rocker arm brake device according to claim 2, characterized in that: The heights of the plurality of brake exhaust protrusions are equal; Alternatively, the heights of the plurality of brake exhaust protrusions are different; Alternatively, the heights of parts of the plurality of brake exhaust bosses are equal.

5. The rocker arm brake device according to claim 4, characterized in that: The tops of the four brake exhaust protrusions are all arranged in an arc shape; Alternatively, the tops of the four brake exhaust protrusions are all arranged flat; Alternatively, among the four brake exhaust protrusions, the tops of some of the brake exhaust protrusions are arranged in an arc shape, and the tops of other parts of the brake exhaust protrusions are arranged straight.

6. The rocker arm brake device according to claim 1, characterized in that: The intake rocker arm assembly comprises: An intake rocker arm is rotatably connected to a cylinder body through an intake shaft; a first intake piston chamber, a second intake piston chamber and a one-way valve chamber are provided on one side of the intake rocker arm located on the intake shaft; the first intake piston chamber includes an upper intake chamber and a lower intake chamber, and the upper intake chamber and the lower intake chamber are connected through a connecting passage; a first intake oil passage, a second intake oil passage and a third intake oil passage are provided on the intake rocker arm, all of which are connected to the one-way valve chamber, the first intake oil passage is used for oil intake, the second intake oil passage is connected to the lower intake chamber, and the third intake oil passage is connected to the second intake piston chamber; an intermediate oil passage connecting the upper intake chamber and the second intake piston chamber is also provided on the intake rocker arm; An intake roller, rotatably arranged on the intake rocker arm at the other side of the intake shaft; A piston one-way valve assembly, comprising an upper chamber elastic member and an upper chamber blocking member, wherein the upper chamber elastic member is connected between the top of the upper chamber and the upper chamber blocking member; The first piston assembly comprises a first piston, an air intake push rod and a first piston elastic member; the first piston is slidably disposed in the lower chamber, the air intake push rod is connected to the first piston, and the first piston elastic member is connected between the air intake push rod and the bottom of the air intake upper chamber; in an initial state, a set interval is provided between the first piston and the bottom of the air intake upper chamber; A second piston assembly comprises a second piston and a second piston elastic member; the second piston is slidably disposed in the second air intake piston cavity, and the second piston elastic member is connected between the second air intake piston cavity and the second piston; The one-way valve assembly includes: a one-way switch member and a one-way elastic member, wherein the one-way elastic member is connected between the one-way valve cavity and the one-way switch member; the one-way switch is slidably arranged in the one-way valve cavity to be able to switch the third intake oil channel and the first connecting port of the one-way valve cavity.

7. The rocker arm brake device according to claim 6, characterized in that: The intake rocker arm is also provided with a pressure regulating chamber and a fourth intake oil passage; the fourth intake oil passage is connected between the one-way valve chamber and the pressure regulating chamber; The intake rocker arm assembly also includes: The pressure regulating assembly comprises a pressure regulating valve core and a pressure regulating elastic member, wherein the pressure regulating elastic member is connected between the pressure regulating valve core and a pressure regulating chamber; the pressure regulating valve core is slidably arranged in the pressure regulating chamber so as to be able to switch the second connecting port between the fourth intake oil passage and the pressure regulating chamber.

8. The rocker arm brake device according to claim 7, characterized in that: The first intake piston chamber and the second intake piston chamber are arranged at an end of the intake rocker arm away from the roller; The one-way valve chamber and the pressure regulating chamber are located in the middle of the intake rocker arm; the length direction of the one-way valve chamber is the same as the thickness direction of the intake rocker arm, and the length direction of the pressure regulating chamber is the same as the length direction of the intake rocker arm.

9. The rocker arm brake device according to any one of claims 1 to 8, characterized in that: The rocker arm brake device also includes a normal exhaust rocker arm assembly and a normal exhaust cam; The normal exhaust rocker arm assembly includes: a normal exhaust rocker arm shaft and a normal exhaust rocker arm; the normal exhaust rocker arm is rotatably arranged on the cylinder body through the normal exhaust rocker arm shaft, a normal exhaust roller is arranged at one end of the normal exhaust rocker arm, and the normal exhaust roller can move along the peripheral wall of the normal exhaust cam, and a normal exhaust control chamber and a normal exhaust piston chamber are arranged on the side of the normal exhaust rocker arm shaft away from the normal exhaust roller; a set amount of fluid can be retained in the normal exhaust piston chamber to enable the normal exhaust piston assembly to open the normal exhaust valve structure.

10. The rocker arm brake device according to claim 9, characterized in that: The normal exhaust rocker arm shaft is provided with a first normal exhaust shaft oil passage and a second normal exhaust shaft oil passage; The normal exhaust rocker arm is provided with a first normal exhaust oil passage, a second normal exhaust oil passage, a third normal exhaust oil passage and a fourth normal exhaust oil passage; the first normal exhaust oil passage is connected to the first normal exhaust shaft oil passage, and the second normal exhaust oil passage is connected to the second normal exhaust shaft oil passage; The normal exhaust control chamber comprises a first normal exhaust chamber and a second normal exhaust chamber which are connected through a normal exhaust communication port; The normal exhaust rocker arm assembly further comprises a normal exhaust control mechanism, wherein the normal exhaust control mechanism comprises a normal exhaust elastic control member arranged in the first normal exhaust cavity and a normal exhaust push rod arranged in the second normal exhaust cavity; The normal exhaust elastic control member can open and close the normal exhaust communication port; The first normal exhaust oil passage is communicated with a portion of the second normal exhaust chamber close to the normal exhaust communication port, and the second normal exhaust oil passage is communicated with a portion of the second normal exhaust chamber far from the normal exhaust communication port, so as to provide oil to push the normal exhaust push rod to lift the normal exhaust elastic control member; the third normal exhaust oil passage is communicated between the first normal exhaust chamber and the normal exhaust piston chamber, and the fourth normal exhaust oil passage is communicated between the second normal exhaust chamber and the normal exhaust piston chamber; The normal exhaust rocker arm assembly also includes a normal exhaust piston mechanism, which includes a normal exhaust piston and a normal exhaust piston reset member; the normal exhaust piston is provided with a normal exhaust installation cavity for installing the normal exhaust piston reset member, and the outer wall of the normal exhaust piston is provided with a normal exhaust groove connected to the normal exhaust installation cavity; the normal exhaust piston can move in the normal exhaust piston cavity, and the normal exhaust groove can be connected to the fourth normal exhaust oil channel while following the movement of the normal exhaust piston.

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