Auxiliary braking system and engine

Abstract

The present invention provides an auxiliary braking system and an engine. The auxiliary braking system includes a camshaft device, a rocker shaft device, an intake rocker arm device, an exhaust rocker arm device, a brake rocker arm device and a crushing device. The camshaft device and the rocker shaft device are both used to connect with the cylinder head of the engine. The exhaust rocker arm device, the intake rocker arm device and the brake rocker arm device are all rotatably connected with the rocker shaft device and are all in contact with the camshaft device. The camshaft device drives the exhaust rocker arm device, the intake rocker arm device and the brake rocker arm device to rotate relative to the rocker shaft device. The crushing device is arranged on the side of the exhaust rocker arm device away from the camshaft device. The crushing device includes a crushing bridge, a first crushing assembly and a driving block. The first crushing assembly and the driving block are both connected to the crushing bridge. The exhaust rocker arm device is connected to the first crushing assembly. The end of the brake rocker arm device away from the camshaft device is located above the driving block. The auxiliary braking system provided by the present invention has a high braking power.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and particularly to an auxiliary braking system and an engine. Background Art

[0002] Engine braking technology is well-known. It only needs to temporarily convert the engine that generates power into an air compressor that absorbs energy. During the conversion process, the fuel supply is cut off, and the valves are opened near the end of the compression stroke of the engine piston, allowing the compressed gas (air during braking) to be released. The energy absorbed by the engine in compressing the gas during the compression stroke cannot return to the engine piston during the subsequent expansion stroke, but is dissipated through the exhaust and heat dissipation systems of the engine. The final result is effective engine braking, which slows down the vehicle speed.

[0003] In the related art, the auxiliary braking system includes an exhaust rocker arm device and a braking rocker arm device. When the engine does positive work, the exhaust rocker arm device drives the two exhaust valves of the engine to move. When the engine brakes, the exhaust rocker arm device and the braking rocker arm device jointly drive the exhaust valves of the engine to move.

[0004] However, the braking power of these auxiliary braking systems is relatively low. Summary of the Invention

[0005] The present invention provides an auxiliary braking system and an engine. The auxiliary braking system can compress and release the brake twice, and has a relatively high braking power.

[0006] In a first aspect, the present invention provides an auxiliary braking system for an engine. The auxiliary braking system includes a camshaft device, a rocker arm shaft device, an intake rocker arm device, an exhaust rocker arm device, a braking rocker arm device, and a collapse device. Both the camshaft device and the rocker arm shaft device are used to be connected to the cylinder head of the engine, and the camshaft device is arranged on one side of the rocker arm shaft device. The exhaust rocker arm device, the intake rocker arm device, and the braking rocker arm device are all rotatably connected to the rocker arm shaft device and are all in contact with the camshaft device. The camshaft device drives the exhaust rocker arm device, the intake rocker arm device, and the braking rocker arm device to rotate relative to the rocker arm shaft device. One end of the intake rocker arm device facing away from the camshaft device is used to be connected to the two first valves of the engine. The collapse device is arranged on the side of the exhaust rocker arm device facing away from the camshaft device, and the collapse device is used to be connected to the two second valves of the engine;

[0007] The collapse device includes a collapse bridge, a first collapse component, and a driving block. Both the first collapse component and the driving block are connected to the collapse bridge. The exhaust rocker arm device is connected to the first collapse component. One end of the braking rocker arm device facing away from the camshaft device is located above the driving block;

[0008] When the engine is doing positive work, the exhaust rocker arm device drives the crush bridge to move through the first crush assembly to drive the two second valves to move. When the engine is braking, the exhaust rocker arm device drives the first crush assembly to move relative to the crush bridge, and the braking rocker arm device abuts against the drive block. The braking rocker arm device drives the drive block to move relative to the crush bridge to drive a second valve to move.

[0009] In one possible implementation, the auxiliary braking system provided by the present invention has a collapse bridge having a first mounting portion, a second mounting portion and a third mounting portion, the first collapse assembly is connected to the first mounting portion, the second mounting portion and the third mounting portion are located on opposite sides of the first mounting portion, the second mounting portion is used to connect to a second valve, and the drive block is slidably connected to the third mounting portion.

[0010] In a possible implementation, the auxiliary brake system provided by the present invention, the first collapse assembly includes a first elastic member, a first shell, a second elastic member, a locking plate and a first pusher, the first elastic member and the first shell are both inserted in the first mounting portion, the first elastic member is sleeved on the first shell, one end of the first elastic member along the elastic force direction abuts against the outer wall of the first shell, and the other end abuts against the inner bottom wall of the first mounting portion;

[0011] One end of the first shell facing away from the first elastic member is connected to the exhaust rocker arm device, the first shell has a first accommodating cavity, the second elastic member and the first pushing member are both located in the first accommodating cavity, the locking plate is located between the first pushing member and the second elastic member, part of the locking plate is located outside the first shell and abuts against the first mounting portion, one end of the second elastic member along the elastic force direction abuts against the bottom wall of the first accommodating cavity, and the other end abuts against the locking plate, the locking plate is rotatably connected to the first shell, and the first pushing member moves toward the second elastic member to drive the locking plate to rotate, so that the locking plate is disengaged from the abutment with the first mounting portion.

[0012] In a possible implementation, the auxiliary brake system provided by the present invention, the locking plate includes a first locking plate and a second locking plate, and one end of the first locking plate and one end of the second locking plate are both hinged to the first housing;

[0013] The first housing has an escape hole for escaping the first locking piece and the second locking piece. The other end of the first locking piece and the other end of the second locking piece are located outside the first housing through the escape hole and abut against the first mounting portion.

[0014] In a possible implementation, in the auxiliary braking system provided by the present invention, the first collapse assembly also includes a thrust block, which is located in the first accommodating cavity and between the locking plate and the second elastic member, the second elastic member abuts against the thrust block, and the thrust block abuts against the locking plate.

[0015] In a possible implementation, the auxiliary brake system provided by the present invention, the brake rocker arm device includes a brake rocker arm and a second collapse assembly, the brake rocker arm is connected to the rocker arm shaft device, the second collapse assembly is inserted in the brake rocker arm, and the second collapse assembly is located above the driving block;

[0016] When the engine performs positive work, the second collapse assembly moves relative to the brake rocker arm. When the engine brakes, the second collapse assembly abuts against the drive block, and the second collapse assembly drives a second valve to move through the drive block.

[0017] In one possible implementation, the auxiliary braking system provided by the present invention has a braking rocker arm with a brake oil channel, and the second collapse assembly includes a second shell, a third elastic member and a piston. The second shell is inserted in the braking rocker arm, and the third elastic member and the piston are both inserted in the second shell. One end of the third elastic member along the elastic force direction abuts against the inner wall of the second shell, and the other end abuts against the piston. The piston is slidably connected to the second shell, and the space enclosed by one end of the piston facing the third elastic member and the inner wall of the second shell is connected to the brake oil channel.

[0018] In a possible implementation, the auxiliary brake system provided by the present invention, the second collapse assembly further includes a second pusher, a fourth elastic member, a third pusher and a fifth elastic member, the second housing has a second accommodating chamber and a third accommodating chamber isolated from each other, and the third elastic member and the piston are both inserted into the second accommodating chamber;

[0019] The second pusher and the fourth elastic member are both arranged in the third accommodating cavity, one end of the fourth elastic member along the elastic force direction abuts against the inner bottom wall of the third accommodating cavity, and the other end abuts against the second pusher, the second pusher is slidably connected to the second shell, the third pusher and the fifth elastic member are located in the inner cavity of the second pusher, one end of the fifth elastic member along the elastic force direction abuts against the inner wall of the second pusher, and the other end abuts against the fifth elastic member;

[0020] The third accommodating chamber is communicated with the brake oil channel, the third pusher moves relative to the second pusher so that the inner cavity of the second pusher is communicated with the third accommodating chamber, and the second pusher moves relative to the second shell so that the inner cavity of the second pusher is communicated with the second accommodating chamber.

[0021] In a possible implementation, the auxiliary braking system provided by the present invention also includes an adjusting component, which includes a connecting member and an adjusting member, one end of the connecting member is connected to an end of the second collapse assembly away from the driving block and is inserted into the brake rocker arm, and the adjusting member is sleeved on the connecting member and abuts against the brake rocker arm.

[0022] In a second aspect, the present invention provides an engine, comprising an engine body and the auxiliary braking system provided in the first aspect above, connected to the engine body.

[0023] The auxiliary braking system and engine provided by the present invention are provided with a camshaft device, a rocker shaft device, an intake rocker arm device, an exhaust rocker arm device, a brake rocker arm device and a crushing device. The camshaft device and the rocker shaft device are both provided on the cylinder head of the engine, and the camshaft device is provided on one side of the rocker shaft device. The exhaust rocker arm device, the intake rocker arm device and the brake rocker arm device are all rotationally connected with the rocker shaft device and are all abutted with the camshaft device. The camshaft device drives the exhaust rocker arm device, the intake rocker arm device and the brake rocker arm device to rotate relative to the rocker shaft device. The end of the intake rocker arm device away from the camshaft device is used for connecting with the two first valves of the engine. The crushing device is provided on the side of the exhaust rocker arm device away from the camshaft device, and the crushing device is used for connecting with the two second valves of the engine. The crushing device includes a crushing bridge, a first crushing assembly and a driving block. The first crushing assembly and the driving block are both connected with the crushing bridge. The exhaust rocker arm device is connected with the first crushing assembly. The end of the brake rocker arm device away from the camshaft device is located above the driving block. Among them, one second valve is connected to the crush bridge, and another second valve is connected to the drive block. When the engine is doing positive work, the exhaust rocker arm device drives the crush bridge to move through the first crush assembly to drive the two second valves to move. When the engine is braking, the exhaust rocker arm device drives the first crush assembly to move relative to the crush bridge, and the brake rocker arm device abuts against the drive block. The brake rocker arm device drives the drive block to move relative to the crush bridge to drive one second valve to move. In this way, when the engine is braking, the movement of the exhaust valve is only driven by the brake rocker arm device, and two compression release brakes can be performed near the compression top dead center and near the exhaust top dead center, thereby improving the braking power of the auxiliary braking system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the structure of an auxiliary braking system provided by an embodiment of the present invention;

[0026] Figure 2 A top view of an auxiliary braking system provided by an embodiment of the present invention;

[0027] Figure 3 When the engine is doing positive work Figure 2 Section view from the middle AA direction Figure 1 ;

[0028] Figure 4 When the engine is doing positive work Figure 2 Section view from the middle AA directionFigure 2 ;

[0029] Figure 5 It is a sectional view taken along the A-A direction in Figure 2 during engine braking;

[0030] Figure 6 It is a sectional view taken along the B-B direction in Figure 2 during the engine doing positive work;

[0031] Figure 7 It is a sectional view taken along the B-B direction in Figure 2 during engine braking;

[0032] Figure 8 It is a schematic structural view of the collapse device in the auxiliary braking system provided by the embodiment of the present invention;

[0033] Figure 9 It is a schematic structural view of the braking cam in the auxiliary braking system provided by the embodiment of the present invention;

[0034] Figure 10 It is a schematic structural view of the braking rocker arm device in the auxiliary braking system provided by the embodiment of the present invention;

[0035] Figure 11 It is Figure 10 a partial enlarged view at C in

[0036] Figure 12 a schematic structural view of another angle of the auxiliary braking system provided by the embodiment of the present invention.

[0037] Explanation of reference numerals:

[0038] 100 - Camshaft device; 110 - Camshaft; 120 - Cam bearing cover; 130 - Intake cam; 140 - Exhaust cam; 150 - Braking cam;

[0039] 200 - Rocker arm shaft device; 210 - Rocker arm shaft; 211 - First oil passage; 212 - Second oil passage; 213 - Third oil passage; 220 - Rocker arm shaft seat; 230 - Rocker arm shaft cover; 240 - Retaining ring; 250 - Washer; 260 - First solenoid valve; 270 - Second solenoid valve;

[0040] 300 - Intake rocker arm device;

[0041] 400 - Exhaust rocker arm device; 410 - Exhaust rocker arm; 411 - Fourth oil passage; 420 - Exhaust roller; 430 - Exhaust roller; 440 - Exhaust adjusting screw; 441 - Fifth oil passage; 450 - Exhaust adjusting nut; 460 - Exhaust elephant foot; 470 - Exhaust bushing;

[0042] 500 - Brake rocker arm device; 510 - Brake rocker arm; 511 - Brake oil passage; 520 - Second crush component; 521 - Second housing; 5211 - Second accommodation cavity; 5212 - Third accommodation cavity; 5213 - First oil inlet hole; 5214 - Second oil inlet hole; 5215 - Third oil inlet hole; 5216 - Fourth oil inlet hole; 5217 - First oil groove; 5218 - Second oil groove; 5219 - Limiting member; 522 - Third elastic member; 523 - Piston; 5231 - Limiting groove; 524 - Second pushing member; 5241 - Fifth oil inlet hole; 5242 - Third oil groove; 5243 - Fourth oil groove; 525 - Fourth elastic member; 526 - Third pushing member; 527 - Fifth elastic member; 530 - Brake roller; 540 - Brake roller; 550 - Brake bushing; 560 - Adjusting component; 561 - Connecting member; 562 - Adjusting member;

[0043] 600 - Crush device; 610 - Crush bridge; 611 - First mounting portion; 612 - Second mounting portion; 613 - Third mounting portion; 620 - First crush component; 621 - First elastic member; 622 - First housing; 6221 - First accommodation cavity; 6222 - Bottom shell; 6223 - Top plate; 6224 - Positioning member; 623 - Second elastic member; 624 - Locking piece; 6241 - First locking piece; 6242 - Second locking piece; 625 - First pushing member; 6251 - Positioning groove; 626 - Thrust block; 630 - Driving block;

[0044] 700 - Pressure plate; 800 - Sixth elastic member. Detailed implementation mode

[0045] In the description of the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" shall be understood in a broad sense. For example, it can be a fixed connection, or an indirect connection through an intermediate medium, or the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0046] In the description of the present invention, the orientation or position relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0047] In the description and claims of the present invention and the above-mentioned drawings, the terms "first", "second", "third" (if any) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein, for example.

[0048] In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or maintenance tool comprising a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or maintenance tools.

[0049] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0050] In the related art, the auxiliary braking system includes an exhaust rocker arm device and a braking rocker arm device. When the engine is doing positive work, the exhaust rocker arm device drives the two exhaust valves of the engine to move. When engine braking occurs, the exhaust rocker arm device and the braking rocker arm device jointly drive the exhaust valves of the engine to move. That is to say, the movement trajectory of one of the exhaust valves is the combined movement trajectory of the exhaust rocker arm device and the braking rocker arm device. However, such an auxiliary braking system can only achieve one compression release braking, that is, only one compression release braking is performed near the end of the compression stroke (near top dead center of compression) within one cycle (four strokes: intake stroke, compression stroke, expansion stroke, and exhaust stroke) of the engine. And two compression release brakings are performed near top dead center of compression and near top dead center of exhaust respectively within one cycle (four strokes). Theoretically, the power of two compression release brakings should be higher than that of one compression release braking. Therefore, the braking power of the auxiliary braking system in the related art is relatively low.

[0051] Therefore, to solve the above technical problems, the present invention provides an auxiliary braking system and an engine. When engine braking occurs, the auxiliary braking system can cause the exhaust rocker arm device to lose its action on the exhaust valve by providing a collapse device, so that the movement trajectory of the exhaust valve is only affected by the braking rocker arm device. In this way, two compression release brakings of the engine can be achieved, thereby improving the braking power.

[0052] The engine provided by the present invention includes an engine body and an auxiliary braking system connected to the engine body.

[0053] Specifically, the engine can be a six-cylinder engine, and an auxiliary braking system is provided for each cylinder.

[0054] Among them, the auxiliary braking system can adopt a structural form of three cylinders in a group to achieve a stepped braking mode of three-cylinder braking or six-cylinder braking, so as to meet the different braking requirements of users under different working conditions.

[0055] The specific structure of the auxiliary braking system will be described below.

[0056] Figure 1 is a schematic structural diagram of the auxiliary braking system provided by an embodiment of the present invention, Figure 2 is a top view of the auxiliary braking system provided by an embodiment of the present invention, Figure 3 is when the engine is doing positive work along Figure 2 the sectional view in the A-A direction in Figure 1 , Figure 4 is when the engine is doing positive work along Figure 2 the sectional view in the A-A direction in Figure 2 , Figure 5 is the sectional view in the A-A direction when the engine is braking along Figure 2 in Figure 6 is when the engine is doing positive work along Figure 2 the sectional view in the B-B direction in Figure 7 is the sectional view in the B-B direction when the engine is braking along Figure 2 in Figure 8 is a schematic structural diagram of the collapse device in the auxiliary braking system provided by an embodiment of the present invention.

[0057] Referring to Figures 1 to 8 as shown, the auxiliary braking system provided by the present invention includes a camshaft device 100, a rocker arm shaft device 200, an intake rocker arm device 300, an exhaust rocker arm device 400, a braking rocker arm device 500, and a collapse device 600.

[0058] The camshaft device 100 and the rocker arm shaft device 200 are both arranged on the cylinder head of the engine, and the camshaft device 100 is arranged on one side of the rocker arm shaft device 200, the exhaust rocker arm device 400, the intake rocker arm device 300 and the brake rocker arm device 500 are all rotatably connected to the rocker arm shaft device 200, and are all abutted against the camshaft device 100, the camshaft device 100 drives the exhaust rocker arm device 400, the intake rocker arm device 300 and the brake rocker arm device 500 to rotate relative to the rocker shaft device 200, the end of the intake rocker arm device 300 away from the camshaft device 100 is used for connecting the two first valves of the engine, and the crushing device 600 is arranged on the side of the exhaust rocker arm device 400 away from the camshaft device 100, and the crushing device 600 is used to connect with the two second valves of the engine.

[0059] The crush device 600 includes a crush bridge 610, a first crush assembly 620 and a drive block 630. The first crush assembly 620 and the drive block 630 are both connected to the crush bridge 610. The exhaust rocker arm device 400 is connected to the first crush assembly 620. The end of the brake rocker arm device 500 that is away from the camshaft device 100 is located above the drive block 630. Among them, a second valve is connected to the crush bridge 610, and another second valve is connected to the drive block 630.

[0060] When the engine is doing positive work, the exhaust rocker arm device 400 drives the crush bridge 610 to move through the first crush assembly 620 to drive the two second valves to move. When the engine is braking, the exhaust rocker arm device 400 drives the first crush assembly 620 to move relative to the crush bridge 610, and the braking rocker arm device 500 abuts against the driving block 630. The braking rocker arm device 500 drives the driving block 630 to move relative to the crush bridge 610 to drive a second valve to move.

[0061] Specifically, the camshaft device 100 drives the intake rocker arm device 300 to rotate around the rocker arm shaft device 200, thereby driving the two first valves of the engine to move.

[0062] When the engine is doing positive work, the camshaft device 100 drives the exhaust rocker arm device 400 to rotate around the rocker arm shaft device 200, and the exhaust rocker arm device 400 drives the crush assembly 600 to move as a whole, thereby driving the two second valves of the engine to move. When the engine is braking, the camshaft device 100 drives the exhaust rocker arm device 400 to rotate around the rocker arm shaft device 200, and the exhaust rocker arm device 400 drives the first crush assembly 620 to move relative to the crush bridge 610, which has no effect on the two second valves.

[0063] When the engine is doing positive work, the camshaft device 100 drives the brake rocker arm device 500 to rotate around the rocker arm shaft device 200, and the brake rocker arm device 500 has no effect on the two second valves. When the engine is braking, the camshaft device 100 drives the brake rocker arm device 500 to rotate around the rocker arm shaft device 200, and the brake rocker arm device 500 keeps contact with the driving block 630, and the brake rocker arm device 500 drives a second valve connected to the driving block 630 through the driving block 630.

[0064] The auxiliary braking system provided in this embodiment is provided by setting a camshaft device 100, a rocker shaft device 200, an intake rocker arm device 300, an exhaust rocker arm device 400, a brake rocker arm device 500 and a collapse device 600. The camshaft device 100 and the rocker arm shaft device 200 are both arranged on the cylinder head of the engine, and the camshaft device 100 is arranged on one side of the rocker arm shaft device 200, the exhaust rocker arm device 400, the intake rocker arm device 300 and the brake rocker arm device 500 are all rotatably connected to the rocker arm shaft device 200, and are all abutted against the camshaft device 100, the camshaft device 100 drives the exhaust rocker arm device 400, the intake rocker arm device 300 and the brake rocker arm device 500 to rotate relative to the rocker shaft device 200, the end of the intake rocker arm device 300 away from the camshaft device 100 is used for connecting the two first valves of the engine, and the crushing device 600 is arranged on the side of the exhaust rocker arm device 400 away from the camshaft device 100, and the crushing device 600 is used to connect with the two second valves of the engine. The crush device 600 includes a crush bridge 610, a first crush assembly 620 and a driving block 630. The first crush assembly 620 and the driving block 630 are both connected to the crush bridge 610. The exhaust rocker arm device 400 is connected to the first crush assembly 620. The end of the brake rocker arm device 500 that is away from the camshaft device 100 is located above the driving block 630. Among them, a second valve is connected to the crush bridge 610, and another second valve is connected to the driving block 630. When the engine is doing positive work, the exhaust rocker arm device 400 drives the crush bridge 610 to move through the first crush assembly 620 to drive the two second valves to move. When the engine is braking, the exhaust rocker arm device 400 drives the first crush assembly 620 to move relative to the crush bridge 610, the brake rocker arm device 500 abuts against the driving block 630, and the brake rocker arm device 500 drives the driving block 630 to move relative to the crush bridge 610 to drive a second valve to move. In this way, when the engine brakes, the movement of the second valve is driven only by the brake rocker device 500, and two compression release brakings can be performed near the compression top dead center and near the exhaust top dead center, thereby improving the braking power of the auxiliary braking system.

[0065] The specific structures of the camshaft device 100 and the rocker shaft device 200 are introduced below.

[0066] See also Figure 1 and Figure 2As shown, the camshaft device 100 includes a camshaft 110, a cam bearing cap 120, an intake cam 130, an exhaust cam 140, and a brake cam 150. The intake cam 130, the exhaust cam 140, and the brake cam 150 are all sleeved on the camshaft 110, and the camshaft 110 is installed on the top of the cylinder head of the engine through the cam bearing cap 120.

[0067] When the engine is a six-cylinder engine, the number of the intake cam 130, the exhaust cam 140, and the brake cam 150 is 6 each, and the number of the intake cam 130, the exhaust cam 140, and the brake cam 150 for each cylinder is one.

[0068] Figure 9 It is a schematic structural diagram of the brake cam in the auxiliary braking system provided by the embodiment of the present invention.

[0069] See Figure 9 As shown, the profile of the brake cam 150 has four protrusions. Among them, the dashed line is the base circle of the brake cam 150.

[0070] In this embodiment, see Figure 1 and Figure 2 As shown, the rocker arm shaft device 200 includes a rocker arm shaft 210, a rocker arm shaft seat 220, and a rocker arm shaft cover 230. The intake rocker arm device 300, the exhaust rocker arm device 400, and the brake rocker arm device 500 are all rotatably connected to the rocker arm shaft 210. The rocker arm shaft 210 is installed on the rocker arm shaft seat 220, and the rocker arm shaft cover 230 covers the rocker arm shaft 210. The rocker arm shaft 210 is installed on the top of the cylinder head of the engine through the rocker arm shaft seat 220 and the rocker arm shaft cover 230. Exemplarily, it can be connected by bolts.

[0071] Among them, snap rings 240 and washers 250 can be provided at both ends of the rocker arm shaft 210 for limiting.

[0072] Specifically, when the engine is a six-cylinder engine, three cylinders share one rocker arm shaft 210. The rocker arm shaft 210 has 3 axial oil channels and several radial oil channels. The 3 axial oil channels are respectively a first oil channel 211, a second oil channel 212, and a third oil channel 213. The first oil channel 211 is the main oil channel, the second oil channel 212 is used to supply oil to the brake rocker arm device 500, and the third oil channel 213 is used to supply oil to the exhaust rocker arm device 400.

[0073] In some embodiments, the rocker arm shaft device 200 further includes a first solenoid valve 260 and a second solenoid valve 270. The first solenoid valve 260 and the second solenoid valve 270 are both inserted into the rocker arm shaft 210. Among them, the first solenoid valve 260 is used to control the on-off of the first oil channel 211 and the second oil channel 212, and the second solenoid valve 270 is used to control the on-off of the first oil channel 211 and the second oil channel 212.

[0074] Exemplarily, when the engine is a six-cylinder engine, the first solenoid valve 260 can be disposed between the first cylinder and the second cylinder, or between the fourth cylinder and the fifth cylinder. The second solenoid valve 270 can be disposed between the second cylinder and the third cylinder, or between the fifth cylinder and the sixth cylinder.

[0075] The specific structure of the exhaust rocker arm device 400 will be introduced below.

[0076] See Figure 1 、 2 、6 and Figure 7 As shown in, the exhaust rocker arm device 400 includes an exhaust rocker arm 410, an exhaust roller shaft 420, an exhaust roller 430, an exhaust adjusting screw 440, an exhaust adjusting nut 450, an exhaust piston 460, and an exhaust bushing 470.

[0077] The exhaust bushing 470 is inserted into the exhaust rocker arm 410, the rocker arm shaft 210 is inserted into the exhaust bushing 470, the exhaust roller shaft 420 is inserted into the exhaust rocker arm 410, the exhaust roller 430 is sleeved on the exhaust roller shaft 420, and the exhaust roller 430 abuts against the exhaust cam 140.

[0078] The exhaust adjusting screw 440 is inserted into the exhaust rocker arm 410, and the exhaust adjusting screw 440 and the exhaust roller shaft 420 are located on opposite sides of the exhaust bushing 470. The exhaust adjusting nut 450 is sleeved on the exhaust adjusting screw 440, and the surface of the exhaust adjusting screw 440 facing the exhaust rocker arm 410 abuts against the exhaust rocker arm 410. The exhaust adjusting nut 450 is located on the side of the exhaust rocker arm 410 facing away from the second valve. The exhaust piston 460 is connected to the end of the exhaust adjusting screw 440 facing away from the second valve, and the exhaust piston 460 is connected to one end of the collapse assembly of the collapse device 600.

[0079] An oil groove for communicating with the third oil passage 213 is provided on the exhaust bushing 470. The exhaust rocker arm 410 has a fourth oil passage 411, the exhaust adjusting screw 440 has a fifth oil passage 441, and an oil hole communicating with the fifth oil passage 441 is provided on the exhaust piston 460. When engine braking is performed, the hydraulic oil in the first oil passage 211 sequentially enters the first collapse assembly 620 through the third oil passage 213, the oil groove on the bushing, the fourth oil passage 411, the fifth oil passage 441, and the oil hole of the exhaust piston 460.

[0080] In some embodiments, an oil hole for communicating with the first oil passage 211 is further provided on the exhaust bushing 470. The hydraulic oil in the first oil passage 211 flows to the position of the exhaust roller shaft 420 through the oil hole on the exhaust bushing 470 and the oil passage on the exhaust rocker arm 410 communicating with the oil hole on the exhaust bushing 470 to lubricate the exhaust roller shaft 420 and the exhaust roller 430.

[0081] It should be noted that the intake rocker arm device 300 includes an intake rocker arm, an intake roller, an intake roller, an intake adjustment screw, an intake adjustment nut, an intake air foot and an intake bushing. The structure of the intake rocker arm device 300 is similar to that of the exhaust rocker arm 410 device 400, and this embodiment will not be repeated here.

[0082] The specific structure of the collapse device 600 is introduced below.

[0083] See also Figure 3 , 4 and Figure 8 As shown, the collapse bridge 610 has a first mounting portion 611, a second mounting portion 612 and a third mounting portion 613, the first collapse assembly 620 is connected to the first mounting portion 611, the second mounting portion 612 and the third mounting portion 613 are located on opposite sides of the first mounting portion 611, the second mounting portion 612 is used to connect to a second valve, and the driving block 630 is slidably connected to the third mounting portion 613. The driving block 630 is connected to another second valve. In this way, the overall size of the collapse bridge 610 is small, which is conducive to reducing the overall size of the collapse device 600.

[0084] In one possible implementation, the first collapse assembly 620 includes a first elastic member 621, a first shell 622, a second elastic member 623, a locking piece 624 and a first pushing member 625. The first elastic member 621 and the first shell 622 are both inserted into the first mounting portion 611. The first elastic member 621 is sleeved on the first shell 622. One end of the first elastic member 621 along the elastic force direction abuts against the outer wall of the first shell 622, and the other end abuts against the inner bottom wall of the first mounting portion 611.

[0085] One end of the first shell 622 facing away from the first elastic member 621 is connected to the exhaust rocker arm device 400, and the first shell 622 has a first accommodating chamber 6221. The second elastic member 623 and the first pushing member 625 are both located in the first accommodating chamber 6221. The locking plate 624 is located between the first pushing member 625 and the second elastic member 623. Part of the locking plate 624 is located outside the first shell 622 and abuts against the first mounting portion 611. One end of the second elastic member 623 along the elastic force direction abuts against the bottom wall of the first accommodating chamber 6221, and the other end abuts against the locking plate 624. The locking plate 624 is rotatably connected to the first shell 622, and the first pushing member 625 moves toward the second elastic member 623 to drive the locking plate 624 to rotate, so that the locking plate 624 is disengaged from the abutment with the first mounting portion 611.

[0086] Specifically, the first shell 622 includes a bottom shell 6222 and a top plate 6223 , the first accommodating cavity 6221 is arranged on the bottom shell 6222 , the top plate 6223 is arranged at one end of the bottom shell 6222 away from the first elastic member 621 , and the top plate 6223 has an oil inlet hole connected to the first accommodating cavity 6221 .

[0087] During engine braking, the hydraulic oil in the exhaust rocker arm device 400 enters the collapse device 600 through the oil inlet hole on the top plate 6223. The hydraulic oil pushes the first pusher 625 downward, and the first pusher 625 drives the locking piece 624 to rotate, so that the locking piece 624 is entirely located within the first receiving cavity 6221, and the locking piece 624 disengages from the first mounting portion 611. At this time, the exhaust rocker arm device 400 rotates, driving the first housing 622 to compress the first elastic member 621, and being unable to push the collapse bridge 610 to move.

[0088] When the engine is doing positive work, the second spring pushes the locking piece 624 to reset, and the locking piece 624 abuts against the first mounting portion 611. At this time, the exhaust rocker arm device 400 rotates, driving the collapse bridge 610 to move through the collapse assembly, thereby driving the two second valves to open and close according to the profile of the exhaust cam 140.

[0089] Wherein, the first elastic member 621 and the second elastic member 623 can be springs or elastic rubbers.

[0090] In some embodiments, the locking piece 624 includes a first locking piece 6241 and a second locking piece 6242. One end of the first locking piece 6241 and one end of the second locking piece 6242 are both hinged to the first housing 622. The first housing 622 has a relief hole for the first locking piece 6241 and the second locking piece 6242. The other end of the first locking piece 6241 and the other end of the second locking piece 6242 are located outside the first housing 622 through the relief hole and abut against the first mounting portion 611. In this way, the first locking piece 6241 and the second locking piece 6242 are more evenly stressed and have higher reliability.

[0091] In a possible implementation manner, the first collapse assembly 620 further includes a thrust block 626. The thrust block 626 is located within the first receiving cavity 6221, and the thrust block 626 is located between the locking piece 624 and the second elastic member 623. The second elastic member 623 abuts against the thrust block 626, and the thrust block 626 abuts against the locking piece 624.

[0092] It can be understood that by providing the thrust block 626, the force-bearing area can be increased, which is beneficial to the force transmission between the locking piece 624 and the second elastic member 623.

[0093] In this embodiment, one of the first pusher 625 and the first housing 622 is provided with a positioning member 6224, and the other is provided with a positioning groove 6251 that matches the positioning member 6224. The extending direction of the positioning groove 6251 is the same as the extending direction of the first housing 622. The positioning member 6224 is inserted into the positioning groove 6251 and is slidably connected to the positioning groove 6251. In this way, the moving direction of the first pusher 625 can be restricted, preventing the first pusher 625 from rotating.

[0094] The specific structure of the brake rocker arm device 500 will be introduced below.

[0095] Figure 10 As shown in the structural schematic diagram of the brake rocker arm device in the auxiliary braking system provided by the embodiment of the present invention, Figure 11 is Figure 10 a partial enlarged view at position C in

[0096] Refer to Figure 1 、 5 、6, 7, 10 and Figure 11 As shown, the brake rocker arm device 500 includes a brake rocker arm 510 and a second collapsible component 520. The brake rocker arm 510 is connected to the rocker arm shaft device 200. The second collapsible component 520 is inserted into the brake rocker arm 510 and is located above the drive block 630.

[0097] When the engine does positive work, the second collapsible component 520 moves relative to the brake rocker arm 510. When engine braking occurs, the second collapsible component 520 abuts against the drive block 630, and the second collapsible component 520 drives a second valve to move through the drive block 630.

[0098] It should be noted that the brake rocker arm 510 device 500 further includes a brake roller 530, a brake roller 540, and a brake bushing 550. The brake bushing 550 is inserted into the brake rocker arm 510, the rocker arm shaft 210 is inserted into the brake bushing 550, the brake roller 530 is inserted into the brake rocker arm 510, the brake roller 540 is sleeved on the brake roller 530, and the brake roller 540 abuts against the brake cam 150.

[0099] Specifically, the brake rocker arm 510 has a brake oil passage 511. The second collapsible component 520 includes a second housing 521, a third elastic member 522, and a piston 523. The second housing 521 is inserted into the brake rocker arm 510. The third elastic member 522 and the piston 523 are both inserted into the second housing 521. One end of the third elastic member 522 in the direction of the elastic force abuts against the inner wall of the second housing 521, and the other end abuts against the piston 523. The piston 523 is slidably connected to the second housing 521. The space formed by the end of the piston 523 facing the third elastic member 522 and the inner wall of the second housing 521 is communicated with the brake oil passage 511.

[0100] Specifically, a limiting member 5219 is provided on one of the second housing 521 and the piston 523, and a limiting groove 5231 that matches the limiting member 5219 is provided on the other. The limiting member 5219 is inserted into the limiting groove 5231 and is slidably connected to the limiting groove 5231. The limiting groove 5231 is used to limit the displacement of the limiting member 5219.

[0101] During engine braking, the hydraulic oil in the first oil passage 211 enters, via the second oil passage 212 and the brake rocker arm 510, into the space enclosed by one end of the piston 523 facing the third elastic member 522 and the inner wall of the second housing 521. Under the action of the hydraulic oil, the piston 523 moves relative to the second housing 521 to the maximum displacement and remains stationary, thereby keeping in contact with the driving block 630.

[0102] In a possible implementation, the second collapse assembly 520 further includes a second pusher 524, a fourth elastic member 525, a third pusher 526, and a fifth elastic member 527. The second housing 521 has a second accommodation cavity 5211 and a third accommodation cavity 5212 that are isolated from each other. Both the third elastic member 522 and the piston 523 are inserted into the second accommodation cavity 5211.

[0103] Both the second pusher 524 and the fourth elastic member 525 are disposed within the third accommodation cavity 5212. One end of the fourth elastic member 525 in the direction of its elastic force abuts against the inner bottom wall of the third accommodation cavity 5212, and the other end abuts against the second pusher 524. The second pusher 524 is slidably connected to the second housing 521. The third pusher 526 and the fifth elastic member 527 are located within the inner cavity of the second pusher 524. One end of the fifth elastic member 527 in the direction of its elastic force abuts against the inner wall of the second pusher 524, and the other end abuts against the fifth elastic member 527.

[0104] The third accommodation cavity 5212 is in communication with the brake oil passage 511. The third pusher 526 moves relative to the second pusher 524 to enable the inner cavity of the second pusher 524 to communicate with the third accommodation cavity 5212. The second pusher 524 moves relative to the second housing 521 to enable the inner cavity of the second pusher 524 to communicate with the second accommodation cavity 5211.

[0105] Specifically, the second housing 521 has a first oil inlet hole 5213, a second oil inlet hole 5214, a third oil inlet hole 5215, and a fourth oil inlet hole 5216. The first oil inlet hole 5213, the second oil inlet hole 5214, and the third oil inlet hole 5215 are all communicated with the third accommodation cavity 5212, and the fourth oil inlet hole 5216 is communicated with the second accommodation cavity 5211. Among them, the first oil inlet hole 5213, the second oil inlet hole 5214, the third oil inlet hole 5215, and the fourth oil inlet hole 5216 are arranged in sequence along the axial direction of the second housing 521. Moreover, the first oil inlet hole 5213 and the third oil inlet hole 5215 are located on the same side of the second housing 521, the second oil inlet hole 5214 and the fourth oil inlet hole 5216 are located on the same side of the second housing 521, and the first oil inlet hole 5213 and the second oil inlet hole 5214 are located on opposite sides of the second housing 521. On the outer wall of the second housing 521, there are provided a first oil groove 5217 and a second oil groove 5218. The first oil groove 5217 is used to communicate the second oil inlet hole 5214 and the fourth oil inlet hole 5216, and the second oil groove 5218 is used to communicate the third oil inlet hole 5215 and the outside of the brake rocker arm 510 device 500.

[0106] There is a gap between the top of the second pusher 524 and the second housing 521, and the first oil inlet hole 5213 is communicated with the gap.

[0107] The top of the second pusher 524 has a fifth oil inlet hole 5241, and the fifth oil inlet hole 5241 is communicated with the inside of the second pusher 524. On the outer wall of the second pusher 524, there are provided a third oil groove 5242 and a fourth oil groove 5243. The third oil groove 5242 and the fourth oil groove 5243 are arranged in parallel, and the third oil groove 5242 is located between the fifth oil inlet hole 5241 and the fourth oil groove 5243. The third oil groove 5242 is communicated with the inner cavity of the second pusher 524, and the third oil groove 5242 is used to communicate the inner cavity of the second pusher 524 and the second oil inlet hole 5214. The fourth oil groove 5243 is used to communicate the second oil inlet hole 5214 and the third oil inlet hole 5215.

[0108] During engine braking, the hydraulic oil in the first oil passage 211 sequentially passes through the second oil passage 212, the braking oil passage 511, and the first oil inlet hole 5213 and enters the gap between the top of the second pusher 524 and the second housing 521, pushing the second pusher 524 to compress the fifth elastic member 527, thereby opening the inner cavity of the second pusher 524. The hydraulic oil enters the inner cavity of the second pusher 524. After the inner cavity of the second pusher 524 is filled, the hydraulic oil further pushes the second pusher 524 to compress the fourth elastic member 525 until the third oil groove 5242 communicates with the second oil inlet hole 5214. The hydraulic oil sequentially passes through the second oil inlet hole 5214, the first oil groove 5217, and the fourth oil inlet hole 5216 and enters the second accommodation cavity 5211. At this time, the space formed by the end of the piston 523 facing the third elastic member 522 and the inner wall of the second housing 521 forms a high-pressure oil chamber. The piston 523 maintains a protruding state and cannot be compressed. The braking rocker arm 510 device 500 controls a second exhaust valve to act according to the braking cam 150 profile through the driving block 630.

[0109] When the in-cylinder braking system is closed, that is, when the engine is doing positive work, the second pusher 524 moves upward under the elastic action of the fourth elastic member 525 until the fourth oil groove 5243 communicates with the second oil inlet hole 5214. The hydraulic oil in the space formed by the end of the piston 523 facing the third elastic member 522 and the inner wall of the second housing 521 is discharged to the outside of the braking rocker arm 510 device 500 sequentially through the fourth oil inlet hole 5216, the first oil groove 5217, the second oil inlet hole 5214, the fourth oil groove 5243, the third oil inlet hole 5215, and the second oil groove 5218. The piston 523 resumes its free telescopic state and cannot push the driving block 630.

[0110] It should be noted that the force required for the piston 523 to overcome the elastic force of the fourth elastic member 525 is less than the force required for the driving block 630 to drive the second valve.

[0111] In order to adjust the distance between the piston 523 and the driving block 630, the braking rocker arm 510 device 500 further includes an adjusting assembly 560. The adjusting assembly 560 includes a connecting member 561 and an adjusting member 562. One end of the connecting member 561 is connected to the end of the second collapsing assembly 520 facing away from the driving block 630 and is inserted into the braking rocker arm 510. The adjusting member 562 is sleeved on the connecting member 561 and abuts against the braking rocker arm 510. In this way, by adjusting the position of the adjusting member 562, the distance between the piston 523 and the driving block 630 can be changed.

[0112] Specifically, the adjusting member 562 can be a nut, and the outer wall of the connecting member 561 has an external thread that matches the internal thread of the nut.

[0113] Figure 12It is a schematic structural diagram of another angle of the auxiliary braking system provided by the embodiment of the present invention.

[0114] Refer to Figure 12 As shown, in some embodiments, in order to prevent the braking roller 540 and the exhaust roller 430 from flying off, the auxiliary braking system further includes a pressing plate 700 and a sixth elastic member 800.

[0115] When the engine is a six-cylinder engine, three cylinders share one pressing plate 700, and each cylinder has two sixth elastic members 800. The sixth elastic member 800 can be sleeved on the pressing plate 700 and is in interference fit.

[0116] The extending direction of the pressing plate 700 is the same as that of the rocker arm shaft device 200. The pressing plate 700 is fixed on the rocker arm shaft cover 230 by bolts. One end of a sixth elastic member 800 is connected to the pressing plate 700, and the other end is connected to the braking roller 540. One end of a sixth elastic member 800 is connected to the pressing plate 700, and the other end is connected to the exhaust roller 430.

[0117] 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 it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; 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.

Claims

1. An auxiliary braking system for an engine, characterized in that, The auxiliary braking system includes a camshaft device, a rocker arm shaft device, an intake rocker arm device, an exhaust rocker arm device, a braking rocker arm device, and a collapse device. The camshaft device and the rocker arm shaft device are used to connect to the cylinder head of the engine, and the camshaft device is arranged on one side of the rocker arm shaft device. The exhaust rocker arm device, the intake rocker arm device, and the braking rocker arm device are all rotatably connected to the rocker arm shaft device and are all in contact with the camshaft device. The camshaft device drives the exhaust rocker arm device, the intake rocker arm device, and the braking rocker arm device to rotate relative to the rocker arm shaft device. One end of the intake rocker arm device away from the camshaft device is used to connect to two first valves of the engine. The collapse device is arranged on the side of the exhaust rocker arm device away from the camshaft device, and the collapse device is used to connect to two second valves of the engine; The collapse device includes a collapse bridge, a first collapse component, and a drive block. The first collapse component and the drive block are both connected to the collapse bridge. The exhaust rocker arm device is connected to the first collapse component. One end of the braking rocker arm device away from the camshaft device is located above the drive block; When the engine is doing positive work, the exhaust rocker arm device drives the collapse bridge to move through the first collapse component to drive the two second valves to move. When the engine is braking, the exhaust rocker arm device drives the first collapse component to move relative to the collapse bridge. The braking rocker arm device is in contact with the drive block, and the braking rocker arm device drives the drive block to move relative to the collapse bridge to drive one of the second valves to move; The collapse bridge has a first mounting portion, a second mounting portion, and a third mounting portion. The first collapse component is connected to the first mounting portion. The second mounting portion and the third mounting portion are located on opposite sides of the first mounting portion. The second mounting portion is used to connect to one of the second valves, and the drive block is slidably connected to the third mounting portion; The first collapse component includes a first elastic member, a first housing, a second elastic member, a lock piece, and a first pushing member. The first elastic member and the first housing are both inserted into the first mounting portion. The first elastic member is sleeved on the first housing. One end of the first elastic member in the direction of the elastic force is in contact with the outer wall of the first housing, and the other end is in contact with the inner bottom wall of the first mounting portion; One end of the first housing away from the first elastic member is connected to the exhaust rocker arm device. The first housing has a first accommodating cavity. The second elastic member and the first pushing member are both located in the first accommodating cavity. The lock piece is located between the first pushing member and the second elastic member. Part of the lock piece is located outside the first housing and is in contact with the first mounting portion. One end of the second elastic member in the direction of the elastic force is in contact with the bottom wall of the first accommodating cavity, and the other end is in contact with the lock piece. The lock piece is rotatably connected to the first housing. The first pushing member moves towards the second elastic member to drive the lock piece to rotate so that the lock piece is disengaged from the contact with the first mounting portion.

2. The auxiliary braking system according to claim 1, wherein The locking piece comprises a first locking piece and a second locking piece, one end of the first locking piece and one end of the second locking piece are both hinged to the first housing; The first housing has an escape hole for escaping the first locking plate and the second locking plate. The other end of the first locking plate and the other end of the second locking plate are located outside the first housing through the escape hole and abut against the first mounting portion.

3. The auxiliary braking system according to claim 1, wherein, The first collapse assembly further includes a thrust block, which is located in the first accommodating cavity and between the locking plate and the second elastic member, the second elastic member abuts against the thrust block, and the thrust block abuts against the locking plate.

4. The auxiliary braking system according to any one of claims 1 to 3, characterized in that The brake rocker arm device comprises a brake rocker arm and a second collapse component, the brake rocker arm is connected to the rocker arm shaft device, the second collapse component is inserted in the brake rocker arm, and the second collapse component is located above the driving block; When the engine performs positive work, the second collapse assembly moves relative to the brake rocker arm. When the engine brakes, the second collapse assembly abuts against the drive block, and the second collapse assembly drives the second valve to move through the drive block.

5. The auxiliary braking system according to claim 4, characterized in that, The brake rocker arm has a brake oil passage, and the second collapse assembly includes a second shell, a third elastic member and a piston. The second shell is inserted in the brake rocker arm, and the third elastic member and the piston are both inserted in the second shell. One end of the third elastic member along the elastic force direction abuts against the inner wall of the second shell, and the other end abuts against the piston. The piston is slidably connected to the second shell, and a space enclosed by one end of the piston facing the third elastic member and the inner wall of the second shell is connected to the brake oil passage.

6. The auxiliary braking system according to claim 5, characterized in that, The second collapse assembly further includes a second pusher, a fourth elastic member, a third pusher and a fifth elastic member, the second housing has a second accommodating chamber and a third accommodating chamber isolated from each other, the third elastic member and the piston are both inserted into the second accommodating chamber; The second pushing member and the fourth elastic member are both arranged in the third accommodating cavity, one end of the fourth elastic member along the elastic force direction abuts against the inner bottom wall of the third accommodating cavity, and the other end abuts against the second pushing member, the second pushing member is slidably connected to the second shell, the third pushing member and the fifth elastic member are located in the inner cavity of the second pushing member, one end of the fifth elastic member along the elastic force direction abuts against the inner wall of the second pushing member, and the other end abuts against the fifth elastic member; The third accommodating chamber is communicated with the brake oil channel, the third pushing member moves relative to the second pushing member so that the inner cavity of the second pushing member is communicated with the third accommodating chamber, and the second pushing member moves relative to the second shell so that the inner cavity of the second pushing member is communicated with the second accommodating chamber.

7. The auxiliary braking system according to claim 4, characterized in that It also includes an adjustment component, which includes a connecting member and an adjusting member. One end of the connecting member is connected to an end of the second collapse assembly away from the driving block and is inserted into the brake rocker arm. The adjusting member is sleeved on the connecting member and abuts against the brake rocker arm.

8. An engine, characterized in that, Comprising an engine body and the auxiliary braking system according to any one of claims 1 to 7 connected to the engine body.

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