阅读说明：本技术 一种发动机的集成式制动摇臂装置 (Integrated braking rocker arm device of engine ) 是由 张芳 范雨 万虎 吴囿霖 李庆华 赵晨瑞 于 2020-06-29 设计创作，主要内容包括：本发明公开了一种发动机的集成式制动摇臂装置,涉及发动机制动摇臂技术领域,其包括设置在摇臂本体上的控制机构,控制机构包括依次安装控制腔内的滑阀、定位环、杯型阀、以及堵塞,滑阀内设有球阀座、套在球阀座外的球阀压缩弹簧、以及位于球阀座上的球阀,球阀座由球阀压缩弹簧压紧,杯型阀内设有球阀活塞弹簧,杯型阀开口端朝向堵塞,另一端底部的凸起抵靠球阀。本发明,控制机构中采用了滑阀结构,提高制动响应速度,可靠性高,结构紧凑。(The invention discloses an integrated braking rocker arm device of an engine, which relates to the technical field of engine braking rocker arms and comprises a control mechanism arranged on a rocker arm body, wherein the control mechanism comprises a slide valve, a positioning ring, a cup-shaped valve and a plug which are sequentially arranged in a control cavity, a ball valve seat, a ball valve compression spring sleeved outside the ball valve seat and a ball valve positioned on the ball valve seat are arranged in the slide valve, the ball valve seat is tightly pressed by the ball valve compression spring, a ball valve piston spring is arranged in the cup-shaped valve, the opening end of the cup-shaped valve faces the plug, and a bulge at the bottom of the other end of the. According to the invention, a slide valve structure is adopted in the control mechanism, the braking response speed is improved, the reliability is high, and the structure is compact.)

1. An integrated brake rocker arm apparatus for an engine, comprising:

the rocker arm comprises a rocker arm body (2), wherein one end of the rocker arm body (2) is in contact connection with an exhaust cam (39) through a roller mechanism (26) hinged to the end, an exhaust foot is arranged in an axial through hole at the other end of the rocker arm body, a control mechanism (27) and a brake mechanism (28) are respectively arranged in an axially arranged control cavity and an axially arranged brake cavity on the rocker arm body (2), and a hydraulic mechanism is arranged in the rocker arm body (2);

control mechanism (27), it sets up the control chamber on rocking arm body (2), control mechanism (27) are including installing slide valve (15) in the control chamber in proper order, holding ring (5), cup type valve (13), and jam (4), be equipped with ball valve seat (19) in slide valve (15), cover ball valve compression spring (18) outside ball valve seat (19), and be located ball valve (17) on ball valve seat (19), ball valve seat (19) are compressed tightly by ball valve compression spring (18), be equipped with ball valve piston spring (20) in cup type valve (13), cup type valve (13) open end orientation jam (4), the arch of cup type valve (13) other end bottom is supported and is leaned on ball valve (17).

2. The integrated brake rocker arm device for engines as claimed in claim 1, characterized in that the edge of the end face of the slide valve (15) in contact with the retaining ring (5) is a spherical arc;

the end surface of the cup-shaped valve (13) contacting with the positioning ring (5) is provided with a large chamfer to communicate with an oil inlet of the rocker arm;

the outer periphery of the slide valve (15) is provided with a plurality of radial through holes for communicating with a brake mechanism (28) through a hydraulic mechanism.

3. The integrated brake rocker arm arrangement of the engine as claimed in claim 1, wherein the cup-shaped valve (13) is a clearance fit with the rocker arm body (2);

the positioning ring (5) is in interference fit with the rocker arm body (2);

the first plug (4) is fastened with the rocker arm body (2) through threads.

4. The integrated brake rocker arm device of the engine as claimed in claim 1, wherein the exhaust gas foot (29) comprises a modulation bolt assembly (22), a rocker arm support spring (9) sleeved outside the modulation bolt assembly (22), and a second adjusting nut (24) arranged outside one end of the modulation bolt assembly (22) far away from the rocker arm support spring (9), and the modulation bolt assembly (22) is locked by the second adjusting nut (24).

5. The integrated brake rocker arm assembly of an engine as set forth in claim 4, wherein the modulation bolt assembly (22) includes:

a sliding sleeve (34) for pressing the exhaust valve bridge;

the adjusting screw (33) comprises a ball head (35) connected with the sliding sleeve (34) and a columnar rod body (36) connected with the ball head (35), the ball head (35) is located in a cavity of the sliding sleeve (34), the rocker arm supporting spring (9) is sleeved outside the columnar rod body (36), and one end, far away from the ball head (35), of the columnar rod body (36) is installed in an axial through hole of the rocker arm body (2); the cavity is eccentric spherical, a yielding groove used for improving the rotation angle of the adjusting screw (33) in the sliding sleeve (34) is arranged between the ball head (35) and the columnar rod body (36), and the diameter of an inlet of the cavity is smaller than that of the ball head (35).

6. The integrated brake rocker arm device for the engine according to claim 1, characterized in that the end of the rocker arm body (2) where the roller means (26) are mounted has two radially arranged and mutually parallel extended ends, each of which is provided with an axial through hole;

the roller mechanism (26) comprises a rocker roller shaft (11) arranged between two axial through holes on two extending ends, a rocker roller (10) sleeved outside the rocker roller shaft (11), a spherical plug (16) arranged between the rocker roller shaft (11) and the rocker roller (10), and an oil pipe (14) arranged between the rocker roller shaft (11) and the rocker roller (10).

7. The integrated brake rocker arm apparatus of an engine of claim 1, further comprising:

the rocker arm bushing (12) is arranged in an axial through hole which is formed in the rocker arm body (2) and located between the roller mechanism (26) and the control mechanism (27), the rocker arm body (2) is installed on a rocker arm shaft through the rocker arm bushing (12), and the rocker arm body (2) can rotate around the rocker arm shaft;

a seal screw (6) mounted on the rocker arm bushing (12);

the exhaust cam (39) drives the rocker arm body (2) to rotate and is matched with a hydraulic mechanism controlled by a solenoid valve to control the action of an exhaust valve bridge through a control mechanism (27) and a brake mechanism (28).

8. The integrated brake rocker arm assembly of an engine as set forth in claim 1, wherein said braking mechanism (28) includes:

the brake actuator assembly (1) comprises a brake adjusting bolt (30), a locking nut (31) and a brake actuator (32), one end of the brake adjusting bolt (30) is connected into a brake cavity in a threaded connection mode, the other end of the brake adjusting bolt is connected with the brake actuator (32), and the locking nut (31) matched with the brake adjusting bolt (30) is arranged inside the brake actuator (32);

the actuator return spring (7) is sleeved outside the brake actuator (32), and the brake actuator (32) is pressed by the actuator return spring (7);

the actuator spring seat (8) is arranged on the outer side of one end, provided with an actuator return spring (7), of the brake actuator assembly (1) and is connected with the rocker arm body (2) through a cross-recessed pan head C-shaped screw;

the first adjusting nut (23) is arranged on the outer side of one end, far away from the actuator return spring (7), of the brake actuator assembly (1), and the brake actuator assembly (1) is locked through the first adjusting nut (23).

9. The integrated brake rocker arm arrangement of an engine as claimed in claim 8, wherein a compensation clearance L exists between the brake adjuster bolt (30) and the locking nut (31), the clearance value of the compensation clearance L being adjusted by means of the adjuster bolt and the adjuster nut.

10. An integrated brake rocker arm assembly for an engine as claimed in claim 1, wherein the hydraulic mechanism comprises:

and the rocker arm oil inlet channel is used for conveying hydraulic oil to a large chamfer at the contact part of the cup-shaped valve (13) and the positioning ring (5) during braking and then enters the control cavity, and one end of the rocker arm oil inlet channel is a rocker arm oil inlet (37).

And a brake chamber oil inlet passage (38) for communicating the control chamber and the brake chamber during braking, one end of which is fitted into the radial through hole of the slide valve (15).

Technical Field

The invention relates to the technical field of engine brake rocker arms, in particular to an integrated brake rocker arm device of an engine.

Background

The rocker arm brake of the heavy diesel engine of the commercial vehicle is an auxiliary brake device integrated on the engine of the commercial vehicle. The commercial vehicle for long-distance transportation needs to use braking frequently when running on a long gentle slope road, and the commercial vehicle without an auxiliary braking device such as engine braking needs to use wheel braking of a foot brake continuously to reduce the speed of the vehicle. However, on a long gentle slope road, the temperature rise of the brake pad is too fast due to long-term use of the wheel brake, so that the temperature of the brake pad is too high, the braking effect is likely to be reduced or even fail, and serious irrecoverable personal safety hazards and property loss are easily caused, which is one of important reasons for frequent occurrence of serious traffic accidents on mountainous roads with complex terrain, and therefore, the auxiliary brake device is necessary for commercial vehicles.

The common auxiliary brake is in the form of a hydraulic retarder, an engine exhaust brake, an engine rocker arm brake, and the like. However, the hydrodynamic retarder is large in size and weight, and is not beneficial to realizing light weight of an automobile. The engine exhaust brake braking power is not too high and is generally required to be used in conjunction with engine rocker arm braking. The engine rocker arm brake has the characteristics of light weight, high brake power and the like, and the working principle is as follows:

when the rocker arm of the engine is braked and started, the exhaust valve of the engine is driven by the small peach point on the cam to be opened near the top dead center of the compression stroke of the engine, and the compressed high-energy gas in the cylinder is rapidly exhausted out of the cylinder at the moment, so that the energy of the compressed gas is released, the braking effect is achieved, the energy of the engine is continuously released and consumed in a reciprocating manner after the high-energy gas is exhausted, the vehicle is finally decelerated, the temperature rise of a brake pad is not too high, and the safety and the reliability are realized.

Engine braking is classified into air release braking and compression release braking in structural principle, wherein compression release braking is classified into bridge braking, dedicated rocker arm braking, and integrated rocker arm braking according to structural forms.

The integrated engine braking rocker arm in the current industry has the advantages of heavy structure, complex structure, slow response and low reliability, and the heavy structure is not beneficial to realizing the light weight of the automobile.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an integrated brake rocker arm device of an engine, which can improve the brake response speed and has high reliability and compact structure.

The invention provides an integrated brake rocker arm device of an engine, which comprises:

the rocker arm comprises a rocker arm body, a rocker arm body and a brake mechanism, wherein one end of the rocker arm body is in contact connection with an exhaust cam through a roller mechanism hinged to the end, an exhaust foot is arranged in an axial through hole at the other end of the rocker arm body, a control mechanism and the brake mechanism are respectively arranged in an axially arranged control cavity and an axially arranged brake cavity on the rocker arm body, and a hydraulic mechanism is arranged in the rocker arm body;

control mechanism, its control chamber that sets up on the rocking arm body, control mechanism are equipped with the ball valve seat in the slide valve, cover ball valve compression spring outside the ball valve seat and be located the ball valve on the ball valve seat including installing slide valve, holding ring, cup type valve and the jam in the control chamber in proper order, ball valve seat compresses tightly by ball valve compression spring, is equipped with ball valve piston spring in the cup type valve, the orientation of cup type valve opening the jam, the arch of cup type valve other end bottom is supported and is leaned on the ball valve.

Preferably, the edge of the end surface of the slide valve, which is contacted with the positioning ring, is a spherical cambered surface;

the end face of the cup-shaped valve, which is contacted with the positioning ring, is provided with a large chamfer so as to be communicated with the oil inlet of the rocker arm;

the periphery of the slide valve is provided with a plurality of radial through holes so as to communicate with the brake mechanism through a hydraulic mechanism.

Preferably, the cup-shaped valve is in clearance fit with the rocker arm body;

the positioning ring is in interference fit with the rocker arm body;

the first plug is fastened with the rocker arm body through threads.

Preferably, the exhaust gas foot comprises a modulating bolt assembly, a rocker arm supporting spring sleeved outside the modulating bolt assembly, and a second adjusting nut arranged at the outer side of one end of the modulating bolt assembly far away from the rocker arm supporting spring, and the modulating bolt assembly is locked through the second adjusting nut.

Preferably, the modulation bolt assembly comprises:

a sliding sleeve for pressing the exhaust door bridge;

the adjusting screw comprises a ball head connected with the sliding sleeve and a columnar rod body connected with the ball head, the ball head is positioned in a cavity of the sliding sleeve, the rocker arm supporting spring is sleeved outside the columnar rod body, and one end, far away from the ball head, of the columnar rod body is arranged in an axial through hole of the rocker arm body; the cavity is eccentric spherical, a abdicating groove for improving the rotation angle of the adjusting screw in the sliding sleeve is arranged between the ball head and the columnar rod body, and the diameter of the inlet of the cavity is smaller than that of the ball head.

Preferably, one end of the rocker arm body, which is provided with the roller mechanism, is provided with two extending ends which are arranged in the radial direction and are parallel to each other, and the two extending ends are respectively provided with an axial through hole;

the roller mechanism comprises a rocker roller shaft arranged between two axial through holes on two extending ends, a rocker roller sleeved outside the rocker roller shaft, a spherical plug arranged between the rocker roller shaft and the rocker roller, and an oil pipe arranged between the rocker roller shaft and the rocker roller.

Preferably, the integrated brake rocker arm apparatus further comprises:

the rocker arm bushing is arranged in an axial through hole between the roller mechanism and the control mechanism on the rocker arm body, the rocker arm body is arranged on the rocker arm shaft through the rocker arm bushing, and the rocker arm body can rotate around the rocker arm shaft;

a seal screw mounted on the rocker bushing;

the exhaust cam drives the rocker arm body to rotate and is matched with a hydraulic mechanism controlled by a solenoid valve to control the action of an exhaust valve bridge through a control mechanism and a brake mechanism.

Preferably, the braking mechanism includes:

the brake actuator assembly comprises a brake adjusting bolt, a locking nut and a brake actuator, wherein one end of the brake adjusting bolt is connected into the brake cavity in a threaded connection mode, the other end of the brake adjusting bolt is connected with the brake actuator, and the locking nut matched with the brake adjusting bolt is arranged in the brake actuator;

the actuator return spring is sleeved outside the brake actuator, and the brake actuator is pressed by the actuator return spring;

the actuator spring seat is arranged on the outer side of one end, provided with an actuator return spring, of the brake actuator assembly and is connected with the rocker arm body through a cross-recessed pan head C-shaped screw;

the first adjusting nut is arranged on the outer side of one end, far away from the actuator return spring, of the brake actuator assembly, and the brake actuator assembly is locked through the first adjusting nut.

Preferably, a compensation clearance L is provided between the brake adjusting bolt and the lock nut, and a clearance value of the compensation clearance L is adjusted by the adjusting bolt and the adjusting nut.

Preferably, the hydraulic mechanism includes:

and the rocker arm oil inlet channel is used for conveying hydraulic oil to the large chamfer at the contact part of the cup-shaped valve and the positioning ring during braking and then enters the control cavity, and one end of the rocker arm oil inlet channel is a rocker arm oil inlet.

And the brake cavity oil inlet channel is used for communicating the control cavity and the brake cavity during braking, and one end of the brake cavity oil inlet channel is matched with the radial through hole in the slide valve.

The invention has the beneficial effects that:

(1) the mechanism has the advantages of simple structure, relatively less parts and high system reliability.

(2) The control mechanism adopts a slide valve structure, increases the stressed sectional area of the one-way valve and is beneficial to improving the response speed.

(3) The contact part of the sliding valve and the positioning ring of the control valve adopts the structural characteristic of a spherical cambered surface, the diameter of the sliding valve is slightly smaller than that of the control cavity at the outer side of the sliding valve, the self-adaptive sealing of the sliding valve is favorably realized, and the sealing reliability of the check valve is improved.

(4) The exhaust elephant foot with the rocker arm supporting spring is compact in structure and stable and reliable in spring performance.

(5) Based on the advantages, the scheme is simple, reliable and easy to realize.

Drawings

FIG. 1 is an exploded view of an integrated brake rocker arm assembly of an engine in a preferred embodiment of the invention.

Fig. 2 is a first external view of an integrated brake rocker arm assembly of an engine in accordance with a preferred embodiment of the present invention.

Fig. 3a-3d are block diagrams of a slide valve in a preferred embodiment of the invention.

FIGS. 4a-4b are block diagrams of a brake actuator assembly in accordance with a preferred embodiment of the present invention;

FIGS. 5a-5b are schematic diagrams of the configuration of an exhaust elephant foot in a preferred embodiment of the invention;

FIG. 6 is a state diagram of the control mechanism of the present invention when the integrated brake rocker arm assembly of the engine is not actuated;

FIG. 7 is a state diagram of the control mechanism during brake ON of the integrated brake rocker arm assembly of the engine in accordance with the preferred embodiment of the present invention;

FIG. 8 is a state diagram of the control mechanism after the integrated brake rocker arm assembly of the engine has been actuated in a preferred embodiment of the present invention;

FIG. 9 is a schematic view of the control mechanism draining oil after the integrated brake rocker arm assembly of the engine is actuated in accordance with the preferred embodiment of the present invention;

fig. 10 is a diagram of the brake mechanism and exhaust elephant foot after the integrated brake rocker arm device of the engine is braked and opened in the preferred embodiment of the invention.

Reference numbers in the figures:

1-a brake actuator assembly; 2-a rocker arm body; 3-cross recess pan head C-shaped screw; 4-first occlusion; 5-a positioning ring; 6-sealing screw; 7-actuator return spring; 8-actuator spring seats; 9-rocker arm support springs; 10-rocker arm roller; 11-rocker roller shaft; 12-a rocker arm bushing; 13-a cup-type valve; 14-tubing; 15-a slide valve; 16-ball plug; 17-a ball valve; 18-ball valve compression spring; 19-ball valve seat; 20-ball valve piston spring; 21-a bowl-shaped plug; 22-adjusting bolt assembly; 23-a first adjusting nut; 24-a second adjusting nut; 25-second occlusion; 26-a roller mechanism; 27-a control mechanism; 28-a braking mechanism; 29-exsufflation elephantfoot; 30-brake adjusting bolt; 31-a locking nut; 32-a brake actuator; 33-adjusting screws; 34-a sliding sleeve; 35-bulb; 36-a cylindrical rod body; 37-rocker arm oil inlet; 38-brake chamber oil inlet; 39-exhaust cam.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Referring to fig. 1, the present invention provides an integrated brake rocker arm device for an engine, which includes a rocker arm body 2, one end of which is in contact connection with an exhaust cam 39 through a roller mechanism 26 hinged at the end, an exhaust gas foot 29 is arranged in an axial through hole at the other end, a control mechanism 27 and a brake mechanism 28 (i.e. an actuating piston) are respectively arranged in an axially arranged control cavity and an axially arranged brake cavity on the rocker arm body 2, and a hydraulic mechanism is arranged in the rocker arm body 2. The control mechanism 27 comprises a slide valve 15, a positioning ring 5, a cup-shaped valve 13 and a plug 4 which are sequentially arranged in a control cavity, wherein a ball valve seat 19, a ball valve compression spring 18 sleeved outside the ball valve seat 19 and a ball valve 17 positioned on the ball valve seat 19 are arranged in the slide valve 15, the ball valve seat 19 is pressed by the ball valve compression spring 18, a ball valve piston spring 20 is arranged in the cup-shaped valve 13, the opening end of the cup-shaped valve 13 faces the plug 4, and the bulge at the bottom of the other end of the cup-shaped valve is abutted to. Between the control means 27 and the braking means 28 there is also an axial cavity in the body 2, in which the second plug 25 is mounted.

The invention meets the requirement of arrangement space and the requirement of quick response of the integrated brake rocker arm device and creatively innovates the structure of the control mechanism 27. The slide valve 15 is adopted in the control mechanism 27, the mechanism structure is simple, the number of parts is relatively small, the arrangement is convenient, the stress of the air distribution system caused by dynamics is reduced, the reliability of the system is high, the stressed sectional area of the one-way valve is increased, and the response speed is favorably improved. In addition, because the corresponding valve core (namely the ball valve 17) of the control mechanism 27 has small mass, the opening and closing response of the control mechanism is quick, and the industrial production requirements can be well met. Furthermore, the radial distribution of control chamber has the oil duct, and its one end is the blind hole, and the other end is stopped up by first jam 4, and first jam 4 passes through the screw fastening with rocking arm body 2. The edge of the end face of the sliding valve 15, which is in contact with the positioning ring 5, is a spherical cambered surface, the end face of the cup-shaped valve 13, which is in contact with the positioning ring 5, is provided with a large chamfer so as to be communicated with a rocker arm oil inlet 37, and the periphery of the sliding valve 15 is provided with a plurality of radial through holes so as to be communicated with the braking mechanism 28 through a hydraulic mechanism.

Referring to fig. 1 and fig. 3a to fig. 3d, since the contact part of the sliding valve 15 of the control mechanism 27 and the positioning ring 5 adopts the structural feature of a spherical arc surface, the diameter of the sliding valve 15 is slightly smaller than that of the control cavity at the outer side thereof, which is beneficial to realizing the self-adaptive sealing of the sliding valve and improving the sealing reliability of the control mechanism 27 as a one-way valve.

Furthermore, clearance fit is formed between the cup-shaped valve 13 and the rocker arm body 2, and interference fit is formed between the positioning ring 5 and the rocker arm body 2, so that the positioning of the slide valve 15 and the cup-shaped valve 13 is realized.

Further, referring to fig. 1, 5a and 5b, the exhaust gas foot 29 includes a modulation bolt assembly 22, a rocker arm supporting spring 9 sleeved outside the modulation bolt assembly 22, and a second adjusting nut 24 disposed outside an end of the modulation bolt assembly 22 away from the rocker arm supporting spring 9, wherein the modulation bolt assembly 22 is locked by the second adjusting nut 24.

The modulating bolt assembly 22 includes a sliding sleeve 34 and an adjusting screw 33 that cooperate with each other. The sliding sleeve 34 is used for pressing the exhaust valve bridge. The adjusting screw 33 is composed of a ball head 35 connected with the sliding sleeve 34 and a columnar rod 36 connected with the ball head 35, the ball head 35 is located in a cavity of the sliding sleeve 34, the rocker arm supporting spring 9 is sleeved outside the columnar rod 36, one end, far away from the ball head 35, of the columnar rod 36 is installed in an axial through hole of the rocker arm body 2, the cavity is in an eccentric spherical shape, a yielding groove used for improving the rotating angle of the adjusting screw 33 in the sliding sleeve 34 is formed between the ball head 35 and the columnar rod 36, and the inlet diameter of the cavity is smaller than the diameter of the ball head 35.

The existence of the exhaust valve gap between the ball 35 and the sliding sleeve 34, the torsion bar realizes the flexible support of the rocker arm, reduces impact or noise, the upper end edge of the sliding sleeve 34 is properly closed, so that the ball 35 of the adjusting bolt cannot fall off from the ball socket, and the ball 35 of the adjusting bolt has a certain displacement space in the sliding sleeve 34.

Furthermore, one end of the rocker arm body 2, which is provided with the roller mechanism 26, is provided with two extending ends which are arranged in the radial direction and are parallel to each other, and the two extending ends are respectively provided with an axial through hole;

the roller mechanism 26 comprises a rocker roller shaft 11 mounted between two axial through holes on two extending ends, a rocker roller 10 sleeved outside the rocker roller shaft 11, a spherical plug 16 mounted between the rocker roller shaft 11 and the rocker roller 10, and an oil pipe 14 mounted between the rocker roller shaft 11 and the rocker roller 10.

Further, the integrated brake rocker arm apparatus further comprises:

a rocker arm bushing 12 which is arranged in an axial through hole between the roller mechanism 26 and the control mechanism 27 on the rocker arm body 2, the rocker arm body 2 is installed on a rocker arm shaft through the rocker arm bushing 12, and the rocker arm body 2 can rotate around the rocker arm shaft;

a seal screw 6 mounted on the rocker arm bushing 12;

the exhaust cam 39 drives the rocker arm body 2 to rotate, and the hydraulic mechanism controlled by the solenoid valve controls the action of the exhaust valve bridge through the control mechanism 27 and the brake mechanism 28.

Further, as shown in fig. 4a and 4b, the braking mechanism 28 includes:

the brake actuator assembly 1 is composed of a brake adjusting bolt 30, a locking nut 31 and a brake actuator 32, wherein one end of the brake adjusting bolt 30 is connected into a brake cavity in a threaded connection mode, the other end of the brake adjusting bolt is connected with the brake actuator 32, and the locking nut 31 matched with the brake adjusting bolt 30 is arranged inside the brake actuator 32.

And the actuator return spring 7 is sleeved outside the brake actuator 32, and the brake actuator 32 is pressed by the actuator return spring 7. The brake actuator assembly 1 is connected with a threaded hole at the top of the brake cavity of the rocker arm body 2 through threads on a brake adjusting bolt 30 and is locked through a first adjusting nut 23.

And the actuator spring seat 8 is arranged on the outer side of one end of the brake actuator assembly 1, which is provided with the actuator return spring 7, and is connected with the rocker arm body 2 through a cross-recessed pan head C-shaped screw. The brake actuator assembly 1 is supported by an actuator return spring 7, and the actuator return spring 7 is limited by an actuator spring seat 8.

And the first adjusting nut 23 is arranged on the outer side of one end of the brake actuator assembly 1, which is far away from the actuator return spring 7, and the brake actuator assembly 1 is locked through the first adjusting nut 23. Further, a compensation clearance L is provided between the brake adjusting bolt 30 and the lock nut 31, and the clearance value of the compensation clearance L is adjusted by the adjusting bolt and the adjusting nut.

Specifically, the head of the brake adjusting bolt 30 is placed in a cavity of the actuating piston (i.e. a cavity inside the brake actuator 32), and then locked by the locking nut 31, a certain gap exists between the brake adjusting bolt 30 and the locking nut 31, and after the brake adjusting bolt 30 is fixed, the actuating piston has a movable gap of 2.5mm, and the gap can be determined according to design requirements.

Further, the hydraulic mechanism includes:

and the rocker arm oil inlet channel is used for conveying hydraulic oil to a large chamfer at the contact part of the cup-shaped valve 13 and the positioning ring 5 during braking and then enters the control cavity, and one end of the rocker arm oil inlet channel is a rocker arm oil inlet 37.

And a brake chamber oil feed passage 38 for communicating the control chamber and the brake chamber during braking, one end of which is fitted into the radial through hole of the slide valve 15. Referring to fig. 6 and 7, when the brake is turned on, an electromagnetic valve (not shown) for controlling engine oil is opened, the engine oil enters from the rocker arm oil inlet 37, the cup valve 13 is pushed to move rightwards after the pressure reaches a certain value, the engine oil flows in through a gap between the cup valve 13 and the positioning ring 5, and then the ball valve 17 is pushed to move leftwards, and the engine oil enters the brake execution cavity oil inlet channel through a gap between the slide valve 15 and the rocker arm body 2 and a gap between the ball valve 17 and the slide valve 15, and then enters the brake cavity, and the brake actuator assembly 1 is pushed to move.

Referring to fig. 8, when the oil pressures on both sides of the ball valve 17 reach a balanced state, the ball valve 17 is pushed back to the inside of the sliding valve 15 under the action of the ball valve compression spring 18 and is pressed and sealed, the cup valve 13 is also jacked up, the hydraulic oil in the high-pressure chamber in the brake chamber is sealed at this time, because the valve bridge counter-acting force exists on the part of the actuating piston at this time, the oil pressure in the high-pressure chamber is much greater than the oil pressure on the right side of the control mechanism 27, and the extended brake actuator assembly 1 realizes the engine braking function, as shown in fig. 9.

Referring to fig. 9, when the brake is closed and the solenoid valve controlling the engine oil is de-energized, the oil pressure in the control chamber drops, the cup valve 13 is reset by the ball valve piston spring 20 to return to the position in contact with the positioning ring 5, the ball valve 17 is pushed open by the cup valve 13, and the brake actuator assembly 1 is reset by the valve force and the spring force of the actuator return spring 7.

The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention.