CN212272336U - Modular engine hydraulic braking device - Google Patents

Abstract

A modular hydraulic engine brake system. The method is characterized in that: the control mechanism comprises a shell, a check valve group and a control valve group which are arranged in the shell, and the control mechanism is arranged in a control cavity of the auxiliary rocker arm; the actuating mechanism comprises an adjusting bolt, an actuating plunger, a third spring seat and a third spring, and is arranged in an actuating cavity of the auxiliary rocker arm. The advantages are that: the control mechanism and the actuating mechanism are in independent modular design, the machining is easy, the assembly process is simple, the machining production efficiency can be greatly improved, and the production cost is reduced.

Description

Modular engine hydraulic braking device

Technical Field

The invention relates to a medium-heavy diesel and natural gas engine, in particular to a modular hydraulic engine braking device.

Background

The engine braking technology is that when the automobile runs, a driver lifts an accelerator pedal, releases a clutch, and utilizes compression resistance generated in the compression stroke of an engine, air intake and exhaust resistance and friction force to form braking force action on a driving wheel so as to brake the automobile. The engine braking technology is divided into three types, namely compression engine braking, air-bleed engine braking and partial air-bleed engine braking. The compression engine braking is to open an exhaust valve or an auxiliary valve near a compression top dead center; bleeder engine braking is opening the exhaust valve throughout the engine cycle; partial bleeder engine braking opens the exhaust valve for most of the engine cycle. The application of the engine braking technology effectively reduces the use frequency of a service brake, and when the whole vehicle runs down steep roads such as long slopes and rugged mountain roads, the engine is used for braking, so that the situation that the temperature of a friction plate of the brake is increased due to long-time use of the brake, the braking force is reduced, and even the brake loses effect can be avoided.

The invention patents of the applicant like the prior application disclose an engine brake device (CN 110425016 a) and a pilot-operated engine brake device (CN 110425015 a), which are matched with an exhaust valve by forming an actuating chamber and a control chamber on an auxiliary rocker arm, installing a control mechanism and an actuating mechanism in the actuating chamber and the control chamber, and controlling an oil path system through a solenoid valve to adjust the position states of the control mechanism and the actuating mechanism.

However, the control mechanism and the actuating mechanism of the engine braking device need to be assembled on the auxiliary rocker arm one by one according to the assembling process, so that the requirement on the machining precision of the actuating cavity and the control cavity on the auxiliary rocker arm is high, the machining difficulty is high, the assembling process is complex, and the production takt is slow.

Disclosure of Invention

In order to overcome the defects of the background art, the invention provides a modularized hydraulic braking device of an engine.

The technical scheme adopted by the invention is as follows: a modularized hydraulic braking device of an engine comprises an exhaust valve, a brake device and a brake device, wherein the exhaust valve comprises a first exhaust valve, a second exhaust valve and a valve bridge transversely arranged on the first exhaust valve and the second exhaust valve;

the sliding pin is arranged in the valve bridge, one end of the sliding pin is contacted with the first exhaust valve, and the other end of the sliding pin penetrates out of the valve bridge;

a rocker shaft having a brake oil passage through which engine oil flows;

a camshaft disposed in parallel with the rocker shaft and having an exhaust cam and an auxiliary cam disposed adjacent to each other;

the exhaust rocker arm is rotatably arranged on the rocker shaft, the front end of the exhaust rocker arm is correspondingly contacted with the valve bridge, and the rear end of the exhaust rocker arm is correspondingly contacted with the exhaust cam;

the auxiliary rocker arm is rotatably arranged on the rocker arm shaft, is adjacent to the exhaust rocker arm, and has the rear end corresponding to the auxiliary cam;

an elastic element capable of pressing the auxiliary rocker arm to maintain contact with the auxiliary cam;

the control mechanism is fixedly arranged in the control cavity and comprises a shell, a one-way valve group and a control valve group, a first mounting cavity and a second mounting cavity are formed at two ends of the shell respectively, a communication channel is arranged between the first mounting cavity and the second mounting cavity, an annular oil groove is formed in the outer ring of the shell, and a plurality of oil holes are formed between the annular oil groove and the communication channel; the check valve group comprises a ball body, a first spring seat and a first spring, the ball body is arranged in the first mounting cavity, the first spring seat is fixedly mounted at the end part of the first mounting cavity, an oil through hole is formed in the center of the first spring seat, and two ends of the first spring are respectively abutted against the ball body and the first spring seat so as to drive the ball body to be in sealed communication with the channel; the control valve group comprises an ejector rod, a second spring seat and a second spring, the ejector rod is arranged in a second mounting cavity, the ejector rod is T-shaped, one end of the ejector rod can penetrate through the communicating channel to enter the first mounting cavity, the second spring seat is fixedly mounted at the end part of the second mounting cavity, two ends of the second spring respectively abut against the ejector rod and the second spring seat and can drive the ejector rod to be in contact with the ball body, and the elastic force of the second spring is greater than that of the first spring;

the actuating mechanism is arranged in the actuating cavity and comprises an adjusting bolt, an actuating plunger, a third spring seat and a third spring, a downward-recessed concave groove is formed at the upper end of the actuating plunger, the third spring seat is fixedly installed at the upper end part of the concave groove, the lower end of the adjusting bolt is arranged in the concave groove, the upper end of the adjusting bolt penetrates through the third spring seat and is in threaded connection with the top end of the actuating cavity, a supporting boss is formed at the lower end of the adjusting bolt, and two ends of the third spring are respectively abutted against the third spring seat and the supporting boss and can drive the bottom of the adjusting bolt to be in contact with the bottom of the concave groove;

the first oil path is communicated with the side wall of the control cavity and corresponds to the annular oil groove, and the second oil path is communicated with the end part of the control cavity and corresponds to the oil through hole.

The outer screw thread structure that is formed with of casing, the control cavity inner wall is formed with the internal thread structure, the casing passes through screw thread fit connection with the control chamber.

An operation hole is formed at the end part of the outer end of the second spring seat.

The first spring seat is in interference fixed fit with the first installation cavity, and the second spring seat is in interference fixed fit with the second installation cavity.

And a conical sealing surface is formed at one end of the communication channel matched with the ball body.

The check valve group also comprises a ball seat, a central hole is formed in the center of the ball seat, an arc surface matched with the ball body is formed at one end of the central hole, and a plurality of flanges are formed on the outer side of the matched end of the ball seat and the ball body; the end part of the first spring seat is provided with a first spring groove, one end of the first spring is sleeved outside the ball seat and is abutted against the turned edge, and the other end of the first spring is arranged in the first spring groove and is abutted against the first spring seat.

The end part of one end of the ejector rod is provided with a spring positioning groove, the end part of the inner end of the second spring seat is provided with a second spring groove, and two ends of the second spring are respectively arranged in the spring positioning groove and the second spring groove.

The third spring seat is in interference fixed fit with the concave groove.

And a third spring groove is formed at the lower end of the third spring seat, the third spring is arranged in the third spring groove, and the end part of the third spring seat is in limit fit with the support boss of the adjusting bolt.

And a locking nut is arranged outside the upper end of the adjusting bolt.

The modular hydraulic engine braking device works according to the following principle:

when the engine works normally, the brake oil path in the rocker shaft has no oil flow, and the executing plunger and the sliding pin keep a certain brake clearance, so that the lift of the auxiliary cam does not work, the normal movement of the exhaust valve is not influenced, and the normal work of the engine is ensured.

When the modularized engine hydraulic braking device works, an electronic control unit of the engine sends an instruction, an electromagnetic valve is opened, so that engine oil can flow into a braking oil path of the rocker shaft, the engine oil in the braking oil path enters a control cavity through a first oil path and then enters a communicating channel through an annular oil groove and an oil hole, one part of the engine oil in the communicating channel enters a second mounting cavity and pushes a mandril to move so that the mandril is separated from a ball body and exits the first mounting cavity, the other part of the engine oil enters the first mounting cavity and enters an execution cavity through the oil hole and a second oil path, the engine oil in the execution cavity pushes an execution plunger to move downwards, so that a braking gap between the execution plunger and a sliding pin is eliminated, the execution plunger is abutted against the sliding pin near the top dead center of the compression stroke of the engine under the driving of an auxiliary cam, and the execution plunger and the sliding pin mutually bear a reaction force, at the moment, high-pressure oil is formed in the execution cavity, the second oil path and the first installation cavity, the ball is pushed to seal the communication channel under the action of the high-pressure oil, so that engine oil cannot flow out, a closed oil path is formed, the execution plunger cannot move upwards, and therefore the sliding pin can be pressed down, the exhaust valve is opened, and engine braking is achieved.

When the modularized engine hydraulic braking device does not work, the electronic control unit of the engine sends out an instruction, the electromagnetic valve is closed, the oil pressure in the braking oil path of the rocker shaft is reduced or is discharged by the electromagnetic valve, the ejector rod is reset under the action of the second spring, one end of the ejector rod extends into the first mounting cavity and pushes the ball to move to open the communicating channel, so that the oil is discharged from the execution cavity, the second oil path and the first mounting cavity, the execution plunger is also reset under the action of the third spring and keeps a certain braking gap with the sliding pin, therefore, the lift of the auxiliary cam does not work, the normal movement of the exhaust valve is not influenced, and the normal work of the engine is ensured.

The invention has the beneficial effects that: by adopting the scheme, the control mechanism and the actuating mechanism can form an independent integral module, a modular design is formed, the processing is easy, the assembly process is simple, the processing production efficiency can be greatly improved, and the production cost is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a modular hydraulic engine braking device according to an embodiment of the present invention.

Fig. 2 is a schematic perspective view of a modular hydraulic engine braking device according to an embodiment of the present invention.

FIG. 3 is a sectional view of the auxiliary rocker arm, the control mechanism and the control mechanism in normal operation of the engine according to the embodiment of the invention.

FIG. 4 is a cross-sectional view of an auxiliary rocker arm, a control mechanism, and a control mechanism during engine braking in accordance with an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of an auxiliary rocker arm according to an embodiment of the invention.

FIG. 6 is a schematic structural diagram of a control mechanism according to an embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a housing according to an embodiment of the invention.

Fig. 8 is a schematic structural view of a first spring seat according to an embodiment of the invention.

Fig. 9 is a schematic structural view of a ball seat according to an embodiment of the present invention.

Fig. 10 is a cross-sectional view of a ball holder in accordance with an embodiment of the present invention.

Fig. 11 is a schematic structural diagram of a carrier rod according to an embodiment of the present invention.

Fig. 12 is a schematic structural view of a second spring seat according to the embodiment of the invention.

FIG. 13 is a schematic structural diagram of an actuator according to an embodiment of the present invention.

FIG. 14 is a schematic structural diagram of an adjusting bolt according to an embodiment of the present invention.

FIG. 15 is a schematic diagram of an actuator according to an embodiment of the present invention.

Fig. 16 is a schematic structural view of a third spring seat according to the embodiment of the invention.

Detailed Description

The embodiments of the invention will be further described with reference to the accompanying drawings in which:

as shown in the figure, the hydraulic brake device of the modular engine comprises an exhaust valve 1, a sliding pin 2, a rocker shaft 3, a camshaft 4, an exhaust rocker arm 5, an auxiliary rocker arm 6, an elastic element 7, a control mechanism 8 and an actuating mechanism 9.

The exhaust valve 1 comprises a first exhaust valve 11, a second exhaust valve 12 and a valve bridge 13 transversely arranged on the first exhaust valve 11 and the second exhaust valve 12, and the first exhaust valve 11 and the second exhaust valve 12 both adopt mushroom-shaped valves and are used for controlling the flow of gas between a combustion chamber and an intake and exhaust manifold in the engine.

The sliding pin 2 is arranged in the valve bridge 13, one end of the sliding pin is in contact with the first exhaust valve 11, and the other end of the sliding pin penetrates through the valve bridge 13, and when the sliding pin 2 is subjected to a large enough acting force, the sliding pin pushes the first exhaust valve 11 to act, so that the exhaust stroke of the first exhaust valve 11 is realized.

The rocker arm shaft 3 is arranged in parallel with the camshaft 4, the camshaft 4 is provided with an exhaust cam 41 and an auxiliary cam 42 which are adjacently arranged, and the camshaft 4 can rotate to drive the exhaust cam 41 and the auxiliary cam 42 to rotate simultaneously.

The exhaust rocker arm 5 is rotatably mounted on the rocker shaft 3, the front end of the exhaust rocker arm 5 is in contact with the valve bridge 13, and the rear end of the exhaust rocker arm 5 is in contact with the exhaust cam 41, so that the exhaust rocker arm 5 can rotate and swing around the rocker shaft 3 under the combined action of the exhaust cam 41 and the exhaust valve 1 along with the rotation of the camshaft 4, and the exhaust stroke of the exhaust valve 1 can be realized through the exhaust cam 41 and the exhaust rocker arm 5.

The rear end of the exhaust rocker arm 5 is provided with a first roller 51 through a first roller shaft, the first roller 51 is in contact with the exhaust cam 41, and the exhaust cam 41 and the first roller 51 form rolling fit, so that the friction force between the exhaust cam 41 and the exhaust rocker arm 5 is greatly reduced, the abrasion is reduced, and the service life is prolonged.

The front end of the exhaust rocker arm 5 is further provided with an adjusting bolt 53, a elephant corner 52 and a fastening nut 54, the elephant corner 52 is pressed at the lower end of the adjusting bolt 53 through a special tool, the elephant corner 52 can freely rotate in a certain rotating angle, the upper end of the adjusting bolt 53 protrudes out of the top of the front end of the exhaust rocker arm 5 and is locked and fixed through the fastening nut 54, connection is firmer and more reliable, the elephant corner 52 is in contact with the valve bridge 13, and due to the fact that the degree of freedom of the elephant corner 52 is higher, the contact effect with the valve bridge 13 is guaranteed along with the swinging action of the exhaust rocker arm 5, and working stability is guaranteed.

The auxiliary rocker arm 6 is rotatably mounted on the rocker shaft 3 and is arranged adjacent to the exhaust rocker arm 5, the rear end of the auxiliary rocker arm corresponds to the auxiliary cam 42, and the auxiliary cam 42 is pressed by the elastic element 7 to contact with the auxiliary cam 42, so that when the camshaft 4 rotates, the auxiliary cam 42 can drive the auxiliary rocker arm 6 to rotate and swing along the rocker shaft 3.

Similarly, a second roller 65 can be mounted at the rear end of the auxiliary rocker arm 6 through a second roller shaft, the second roller 65 contacts with the auxiliary cam 42, and the auxiliary cam 42 and the second roller 65 form rolling fit, so that the friction force between the auxiliary cam 42 and the auxiliary rocker arm 6 is greatly reduced, the abrasion is reduced, and the service life is prolonged.

The auxiliary cam 42 includes a base circle and one or two peaches, for example, two peaches are provided in the present embodiment, and each peaches includes a brake peach for providing a brake lift and an EGR peach or a BGR peach, the optional EGR peach may provide an EGR lift when the engine is doing positive power, and the optional BGR peach may provide a BGR lift when the engine is braking.

In addition, there are many alternative ways for the elastic element 7, in this embodiment, the elastic element 7 is a spring, one end of which is fixed on the rear end of the auxiliary rocker arm 6, and the other end of which is fixed on a spring holder (not shown in the figure) fixed on the engine cylinder head or other fixed parts, and the elastic element 7 has enough spring force to make the engine auxiliary rocker arm 6 always contact with the auxiliary cam 42 during the operation of the engine.

Of course, the auxiliary rocker arm 6 may be held in contact with the auxiliary cam 42 during engine operation by other means, such as a leaf spring, torsion spring, or the like.

The rocker shaft 3 has a brake oil path 31 for oil to flow through, the brake oil path 31 is provided with an electromagnetic valve (not shown in the figure), the electromagnetic valve is controlled by an electronic control unit of the engine, when the electronic control unit receives a brake signal, the electromagnetic valve is controlled to be opened, the oil can enter the brake oil path 31 through the electromagnetic valve, and when the electronic control unit receives a signal for stopping braking, the electromagnetic valve is controlled to be closed, and the oil cannot enter the brake oil path 31.

The auxiliary rocker arm 6 is also provided with a control cavity 61, an execution cavity 62, a first oil path 63 and a second oil path 64.

The actuation chamber 62 is provided at the front end of the auxiliary rocker arm 6 and is arranged vertically with respect to the rocker shaft 3, and its lower end opening is provided in correspondence with the slide pin 2.

The control chamber 61 may be vertically disposed with respect to the rocker shaft 3 and disposed in the same plane as the actuating chamber 62, and the control chamber 61 is open at one end.

The first oil passage 63 communicates the brake oil passage 31 with the control chamber 61 and communicates with a side wall of the control chamber 61, and the second oil passage 64 has one end communicating with an end portion of the control chamber 61 and the other end communicating with a side wall of the actuation chamber 62 near the upper end.

The control mechanism 8 is arranged in the control cavity 61 and comprises a shell 81, a check valve set and a control valve set, wherein the check valve set comprises a ball 82, a first spring seat 83, a first spring 84 and a ball seat 88, and the control valve set comprises a push rod 85, a second spring seat 86 and a second spring 87.

A first mounting cavity 811 and a second mounting cavity 812 are formed at two ends of the housing 81 respectively, a communication passage 813 is arranged between the first mounting cavity 811 and the second mounting cavity 812, an annular oil groove 814 is formed on the outer ring of the housing 81, and a plurality of oil holes 815 are formed between the annular oil groove 814 and the communication passage 813. Wherein a conical sealing surface 816 is formed at the end of the communication channel 813 that mates with the ball 82 to ensure a reliable seal with the ball 82.

Check valve group sets up at first installation cavity 811, spheroid 82 sets up in first installation cavity 811, first spring holder 83 fixed mounting is at the tip of first installation cavity 811, just first spring holder 83 center is formed with oil hole 831, first spring holder 83 tip is formed with first spring groove 832, ball seat 88 center is formed with centre bore 881, centre bore 881 one end is formed with the arc surface 882 with spheroid 82 adaptation, ball seat 88 is formed with a plurality of turn-ups 883 with the outside of spheroid 82 cooperation one end, first spring 84 pot head is established outside the ball seat 88 and is offseted with turn-ups 883, and the other end setting offsets with first spring holder 83 in first spring groove 832, can order to order about spheroid 82 and the sealed intercommunication passageway 813 of toper seal face 816 contact. The ball seat 88 is arranged to accurately position the ball 82, so that reliable sealing between the ball 82 and the tapered sealing surface 816 is ensured after the ball 82 moves, a better positioning effect is achieved for the first spring 84, and stability and reliability of movement are ensured.

The control valve group is arranged in the second mounting cavity 812, the ejector rod 85 is in a T shape, an extension 852 is provided at the center of one end thereof, which can be inserted into the communication passage 813 and enter the first mounting chamber 811, and a spring positioning groove 851 is formed at the end of the other end thereof, the second spring seat 86 is fixedly mounted at the end of the second mounting chamber 812, and a second spring slot 861 is formed at the end of the inner end of the second spring seat 86, the two ends of the second spring 87 are respectively arranged in the spring positioning slot 851 and the second spring slot 861, and respectively pushes against the top rod 85 and the second spring seat 86, the extending part 852 of the top rod 85 can be driven to contact with the ball 82, the elastic force of the second spring 87 is greater than that of the first spring 84, thus, under normal conditions, the stem 85 can push the ball 82 open, separating the ball 82 from the conical sealing surface 816, and the first mounting cavity 811 is in communication with the connecting channel 813.

In addition, the first spring seat 83 is in interference fixed fit with the first mounting cavity 811, the second spring seat 86 is in interference fixed fit with the second mounting cavity 812, an external thread structure is formed outside the housing 81, an internal thread structure is formed on the inner wall of the control cavity 61, the housing 81 is in threaded fit connection with the control cavity 61, and an operation hole 862 which is convenient to rotate is formed at the end of the outer end of the second spring seat 86.

When installing control mechanism 8, at first put into spheroid 82 in proper order in first installation cavity 811, ball seat 88, first spring holder 83 of impressing behind first spring 84, then put into ejector pin 85 in proper order in second installation cavity 812, second spring holder 86 of impressing behind second spring 87, make control mechanism 8 form a whole module, put into control chamber 61 with whole control mechanism 8 at last again, and through the screw thread fastening cooperation, the equipment operation is very convenient, simplify assembly process greatly, can improve processing production efficiency by a wide margin, and the production cost is reduced.

The actuator 9 is disposed in the actuator chamber 62 and includes an adjusting bolt 91, an actuator plunger 92, a third spring seat 93, and a third spring 94.

Execute plunger 92 upper end and be formed with undercut's sunken groove 921, third spring holder 93 fixed mounting is at the upper end tip of sunken groove 921, just third spring holder 93 lower extreme is formed with third spring groove 931, adjusting bolt 91 lower extreme sets up in sunken groove 921, and the upper end is worn out third spring holder 93 and is executed 62 top threaded connection of chamber, just adjusting bolt 91 lower extreme is formed with the support boss 911, just support boss 911 and the tip of third spring holder 93 and constitute spacing cooperation, third spring 94 sets up in third spring groove 931, and its both ends respectively with third spring holder 93, support boss 911 counterbalance, can order to order about adjusting bolt 91 bottom and sunken groove 921 bottom and contact.

The third spring seat 93 is in interference fixed fit with the recessed groove 921, and a locking nut 95 is further arranged outside the upper end of the adjusting bolt 91.

When the actuating mechanism 9 is installed, the adjusting bolt 91 and the third spring 94 are sequentially placed in the recessed groove 921 of the actuating plunger 92, and the third spring seat 93 is pressed again, so that the actuating mechanism 9 forms an integral module, the whole actuating mechanism 9 is placed into the actuating cavity 62 at last, the top of the actuating cavity 62 is in threaded connection with the adjusting bolt 91 through the adjusting bolt 91, and finally, the locking is fixed through the locking nut 95, the assembling operation is very convenient, the assembling process is greatly simplified, the processing and production efficiency can be greatly improved, and the production cost is reduced.

The modular hydraulic engine braking device works according to the following principle:

when the engine normally works, no oil flows through the brake oil path 31 in the rocker shaft 3, and the actuating plunger 92 is kept at the upper part under the action of the third spring 94, so that a certain brake clearance can be kept between the actuating plunger and the sliding pin 2, therefore, the lift of the auxiliary cam 42 does not work, the normal movement of the exhaust valve 1 is not influenced, and the normal work of the engine is ensured.

When the modularized engine hydraulic brake device works, the electronic control unit of the engine sends a command, the electromagnetic valve is opened, so that the engine oil can flow into the brake oil path 31 of the rocker shaft 3, the engine oil in the brake oil path 31 enters the control cavity 61 through the first oil path 63, then enters the communication channel 813 through the annular oil groove 814 and the oil hole 815, a part of the engine oil in the communication channel 813 enters the second mounting cavity 812, pushes the ejector rod 85 to move, so that the ejector rod is separated from the ball 82 and exits the first mounting cavity 811, the other part enters the first mounting cavity 811, and enters the execution cavity 62 through the oil hole 831 and the second oil path 64, the engine oil in the execution cavity 62 pushes the execution plunger 92 to move downwards, so that the brake clearance between the execution plunger 92 and the sliding pin 2 is eliminated, under the driving of the auxiliary cam 42, near the top dead center of the compression stroke of the engine, the actuating plunger 92 is abutted against the sliding pin 2, the actuating plunger 92 and the sliding pin 2 are subjected to a reaction force mutually, at the moment, high-pressure oil is formed in the actuating cavity 62, the second oil path 64 and the first mounting cavity 811, the ball 82 is pushed to seal the communication channel 813 under the action of the high-pressure oil, therefore, the engine oil cannot flow out, a closed oil path is formed, the actuating plunger 92 cannot move upwards, therefore, the sliding pin 2 can be pressed down, the exhaust valve 1 is opened, and the engine brake is realized.

When the modularized engine hydraulic brake device does not work, an electronic control unit of the engine sends a command, the electromagnetic valve is closed, the oil pressure in the brake oil path 31 of the rocker shaft 3 is reduced or is discharged from the electromagnetic valve, the ejector rod 85 is reset under the action of the second spring 87, one end of the ejector rod 85 extends into the first mounting cavity 811 and pushes the ball 82 to move to open the communication channel 813, so that the oil is discharged from the execution cavity 62, the second oil path 64 and the first mounting cavity 811, the execution plunger 92 is also reset under the action of the third spring 94, and a certain brake clearance is kept between the execution plunger 92 and the sliding pin 2, therefore, the lift of the auxiliary cam 42 does not work, the normal movement of the exhaust valve 1 is not influenced, and the normal operation of the engine is ensured.

By adopting the scheme, the control mechanism and the actuating mechanism can both form an independent integral module, a modular design is formed, the processing is easy, the assembly process is simple, the processing production efficiency can be greatly improved, and the production cost is reduced.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The skilled person should understand that: although the invention has been described in terms of the above specific embodiments, the inventive concept is not limited thereto and any modification applying the inventive concept is intended to be included within the scope of the patent claims.

Claims (10)

1. A modular hydraulic engine brake system includes

The exhaust valve (1) comprises a first exhaust valve (11), a second exhaust valve (12) and a valve bridge (13) transversely arranged on the first exhaust valve (11) and the second exhaust valve (12);

the sliding pin (2) is arranged in the valve bridge (13), one end of the sliding pin is in contact with the first exhaust valve (11), and the other end of the sliding pin penetrates out of the valve bridge (13);

a rocker shaft (3) having a brake oil passage (31) through which oil flows;

a camshaft (4) that is disposed in parallel with the rocker shaft (3) and has an exhaust cam (41) and an auxiliary cam (42) disposed adjacent to each other;

an exhaust rocker arm (5) rotatably mounted on the rocker shaft (3), the front end of which is in contact with the valve bridge (13) and the rear end of which is in contact with the exhaust cam (41);

the auxiliary rocker arm (6) is rotatably arranged on the rocker arm shaft (3), is adjacent to the exhaust rocker arm (5), and has the rear end corresponding to the auxiliary cam (42), the auxiliary rocker arm (6) is also provided with a control cavity (61), an execution cavity (62), a first oil path (63) for communicating the brake oil path (31) with the control cavity (61) and a second oil path (64) for communicating the control cavity (61) with the execution cavity (62), the execution cavity (62) is positioned at the front end of the auxiliary rocker arm (6), and the opening at the lower end of the execution cavity (62) corresponds to the sliding pin (2);

an elastic element (7) capable of pressing the auxiliary rocker arm (6) into contact with the auxiliary cam (42);

the method is characterized in that: also comprises

The control mechanism (8) is fixedly installed in the control cavity (61) and comprises a shell (81), a check valve group and a control valve group, a first installation cavity (811) and a second installation cavity (812) are formed at two ends of the shell (81) respectively, a communication channel (813) is arranged between the first installation cavity (811) and the second installation cavity (812), an annular oil groove (814) is formed in the outer ring of the shell (81), and a plurality of oil holes (815) are formed between the annular oil groove (814) and the communication channel (813); the check valve group comprises a ball body (82), a first spring seat (83) and a first spring (84), the ball body (82) is arranged in a first installation cavity (811), the first spring seat (83) is fixedly installed at the end part of the first installation cavity (811), an oil through hole (831) is formed in the center of the first spring seat (83), and two ends of the first spring (84) respectively abut against the ball body (82) and the first spring seat (83) and can drive the ball body (82) to be communicated with a channel (813) in a sealing mode; the control valve group comprises a push rod (85), a second spring seat (86) and a second spring (87), the push rod (85) is arranged in a second installation cavity (812), the push rod (85) is T-shaped, one end of the push rod (85) can penetrate through a communication channel (813) to enter the first installation cavity (811), the second spring seat (86) is fixedly installed at the end part of the second installation cavity (812), two ends of the second spring (87) respectively abut against the push rod (85) and the second spring seat (86), the push rod (85) can be driven to be in contact with a ball body (82), and the elastic force of the second spring (87) is greater than that of the first spring (84);

the actuating mechanism (9) is arranged in the actuating cavity (62) and comprises an adjusting bolt (91), an actuating plunger (92), a third spring seat (93) and a third spring (94), a concave groove (921) which is concave downwards is formed at the upper end of the actuating plunger (92), the third spring seat (93) is fixedly installed at the upper end part of the concave groove (921), the lower end of the adjusting bolt (91) is arranged in the concave groove (921), the upper end of the adjusting bolt penetrates through the third spring seat (93) to be in threaded connection with the top end of the actuating cavity (62), a supporting boss (911) is formed at the lower end of the adjusting bolt (91), two ends of the third spring (94) respectively abut against the third spring seat (93) and the supporting boss (911), and the bottom of the adjusting bolt (91) can be driven to contact with the bottom of the concave groove (921);

the first oil passage (63) communicates with a side wall of the control chamber (61) and corresponds to the annular oil groove (814), and the second oil passage (64) communicates with an end portion of the control chamber (61) and corresponds to the oil passage hole (831).

2. A modular hydraulic engine brake system as claimed in claim 1, wherein: the casing (81) is formed with the external screw thread structure outward, control chamber (61) inner wall is formed with the internal thread structure, casing (81) are connected through screw-thread fit with control chamber (61).

3. A modular hydraulic engine brake system as claimed in claim 1, wherein: an operation hole (862) is formed at an outer end of the second spring seat (86).

4. A modular hydraulic engine brake system as claimed in claim 1, wherein: the first spring seat (83) is in interference fixed fit with the first installation cavity (811), and the second spring seat (86) is in interference fixed fit with the second installation cavity (812).

5. A modular hydraulic engine brake system as claimed in claim 1, wherein: the end of the communication channel (813) which is matched with the ball body (2) is provided with a conical sealing surface (816).

6. A modular hydraulic engine brake system as claimed in claim 1, wherein: the check valve group also comprises a ball seat (88), a center hole (881) is formed in the center of the ball seat (88), an arc surface (882) matched with the ball body (82) is formed at one end of the center hole (881), and a plurality of flanges (883) are formed on the outer side of the matched end of the ball seat (88) and the ball body (82); a first spring groove (832) is formed in the end portion of the first spring seat (83), one end of the first spring (84) is sleeved outside the ball seat (88) and abuts against the flange (883), and the other end of the first spring is arranged in the first spring groove (832) and abuts against the first spring seat (83).

7. A modular hydraulic engine brake system as claimed in claim 1, wherein: the end part of one end of the ejector rod (85) is provided with a spring positioning groove (851), the end part of the inner end of the second spring seat (86) is provided with a second spring groove (861), and the two ends of the second spring (87) are respectively arranged in the spring positioning groove (851) and the second spring groove (861).

8. A modular hydraulic engine brake system as claimed in claim 1, wherein: and the third spring seat (93) is fixedly matched with the concave groove (921) through interference.

9. A modular hydraulic engine brake system as claimed in claim 1, wherein: the lower end of the third spring seat (93) is provided with a third spring groove (931), the third spring (94) is arranged in the third spring groove (931), and the end of the third spring seat (93) is in limit fit with a support boss (911) of the adjusting bolt (91).

10. A modular hydraulic engine brake system as claimed in claim 1, wherein: and a locking nut (95) is also arranged outside the upper end of the adjusting bolt (91).

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