CN110425015B - Hydraulic control type engine braking device - Google Patents
Hydraulic control type engine braking device Download PDFInfo
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- CN110425015B CN110425015B CN201910850881.9A CN201910850881A CN110425015B CN 110425015 B CN110425015 B CN 110425015B CN 201910850881 A CN201910850881 A CN 201910850881A CN 110425015 B CN110425015 B CN 110425015B
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- plunger
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- 239000010705 motor oil Substances 0.000 claims abstract description 23
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- 238000000034 method Methods 0.000 claims description 4
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- 235000006040 Prunus persica var persica Nutrition 0.000 description 8
- 244000144730 Amygdalus persica Species 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 3
- 240000005809 Prunus persica Species 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 239000003345 natural gas Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake
Abstract
The hydraulic control type engine braking device is characterized in that a control mechanism is arranged in a control cavity and comprises a one-way control valve, a first spring and a check ring, wherein the one-way control valve is provided with a first position for pushing engine oil to unidirectionally close a second oil way and a second position for pushing the first spring to open the second oil way; the actuating mechanism is arranged in the actuating cavity and comprises an adjusting bolt, a clamp spring, a blocking cover, an actuating plunger and a second spring; the actuating plunger has a third position in which a braking gap is maintained with the slide pin and a fourth position in which the actuating plunger is in contact with the slide pin and drives the slide pin to perform braking. The hydraulic control engine braking device has the advantages of simple and stable structure, compact space, no influence on the whole height of the engine, and stable and efficient braking operation.
Description
Technical Field
The invention relates to a medium and heavy diesel and natural gas engine, in particular to a hydraulic control type engine braking device.
Background
The mountain area of China is numerous, the mountain area is large, the mountain area is about 69 percent of the total area of China, a heavy truck is used for braking frequently in a mountain area on a downhill road section, a driver can absorb larger energy in a short time by using the service brake, but the surface temperature of a friction pair between a brake drum and a brake shoe is increased along with the increase of the braking time, the friction coefficient is reduced, and finally, the dangerous condition of the reduction of the braking efficiency and even the braking failure is caused, so that serious traffic accidents are caused. In order to improve the driving safety of heavy commercial vehicles, an auxiliary braking system needs to be added on the basis of service braking to ensure that the vehicle has a constant braking force in the downhill process.
Auxiliary braking systems for vehicles are mainly divided into two categories: retarder and engine braking system. The engine braking system is widely used due to the advantages of simple structure, convenient installation, low price and the like.
The engine braking technology is that a driver lifts an accelerator pedal in the running process of an automobile, releases a clutch, and utilizes compression resistance generated in the compression stroke of the engine and the action of air inlet and outlet resistance and friction force on braking force formed by driving wheels to brake the automobile. The engine braking technology is divided into three types of compression engine braking, air leakage type engine braking and partial air leakage type engine braking. Compression engine braking is opening an exhaust valve or auxiliary valve near compression top dead center; the bleeder type engine brake is to open the exhaust valve throughout the engine cycle; partial bleeder engine braking is the opening of the exhaust valve for the majority of the engine cycle. The application of the engine braking technology effectively reduces the use frequency of the service brake, and when the whole vehicle is used on steep roads such as downhill slopes, rugged mountain roads and the like, the engine braking can be avoided, and the temperature of the friction plate of the brake is increased, so that the braking force is reduced and even is disabled due to long-time use of the brake.
The engine braking device is capable of providing one or more auxiliary valve lifts for implementing an engine braking function. There are several patents related to the application of this technology, mainly including additional auxiliary lift or auxiliary lifts outside the main lift of the cams, and also adding a cam specially used for braking, the engine braking device can make the auxiliary lift active or make it inactive according to the requirement of engine operation.
Patent CN201080019296.1 is a jacobs vehicle systems company applied lost motion variable valve actuation system for engine braking and early exhaust valve opening that may include a first cam having a compression release lobe and an early exhaust valve opening lobe connected to a hydraulic lost motion system having a first rocker arm. A hydraulically actuated piston may be selectively extended from the hydraulic lost motion system to provide compression release actuation or early exhaust valve opening actuation to the exhaust valve. The hydraulically actuated piston may be provided in a fixed housing as a slave piston in a master-slave piston circuit or, alternatively, slidably disposed in a rocker arm as a hydraulic piston; patent CN200910140026.5 is an engine brake device with a valve assist control unit and a method for engine braking, filed by the german commercial vehicle company, the exhaust valve of which is connected to the camshaft by means of a mechanical connection comprising a hydraulic valve assist control unit. The hydraulic valve assist control unit holds the exhaust valve in a temporarily open position. The hydraulic valve auxiliary control unit can be switched on and off by means of an auxiliary oil circuit which is additionally arranged with respect to the main oil circuit of the internal combustion engine.
The engine braking related patent has a complex structure and a plurality of related components.
Disclosure of Invention
In order to overcome the defects of the background technology, the invention provides a hydraulic control type engine braking device, which mainly solves the technical problems of complex engine braking structure, poor reliability and durability and the like in the prior art.
The invention adopts the technical scheme that: a hydraulically controlled engine brake device includes
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 through 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 adjacently;
an exhaust rocker arm rotatably mounted on the rocker shaft, the front end of the exhaust rocker arm being in corresponding contact with the valve bridge, and the rear end of the exhaust rocker arm being in corresponding contact with the exhaust cam;
the auxiliary rocker arm is rotatably arranged on the rocker arm shaft, is arranged adjacent to the exhaust rocker arm, and has a rear end corresponding to the auxiliary cam, and is also provided with a control cavity, an execution cavity, a first oil circuit for communicating a brake oil circuit with the control cavity and a second oil circuit for communicating the control cavity with the execution cavity, wherein the execution cavity is positioned at the front end of the auxiliary rocker arm, and an opening at the lower end of the execution cavity corresponds to the sliding pin;
an elastic member capable of holding the auxiliary rocker arm in contact with the auxiliary cam;
the control mechanism is arranged in the control cavity and comprises a one-way control valve, a first spring and a check ring, wherein the one-way control valve is movably arranged in the control cavity, the check ring is arranged at an opening of the control cavity, the first spring is arranged between the check ring and the one-way control valve, and the one-way control valve is provided with a first position for pushing the one-way closed second oil way by engine oil and a second position for pushing the opened second oil way by the first spring;
the actuating mechanism is arranged in the actuating cavity and comprises an adjusting bolt, a clamp spring, a blocking cover, an actuating plunger and a second spring; the adjusting bolt is arranged on the auxiliary rocker arm and penetrates into the execution cavity from top to bottom, and an annular limiting groove is formed in the outer ring, close to the lower end, of the adjusting bolt; the clamp spring is sleeved in the annular limiting groove, can slide up and down along the annular limiting groove and is in limiting fit with the upper end and the lower end of the annular limiting groove; the baffle cover is arranged at the opening at the lower end of the execution cavity; the actuating plunger is T-shaped and is arranged in the actuating cavity, a groove matched with the adjusting bolt is formed at the upper end of the actuating plunger, a clamp spring groove matched with the clamp spring is formed in the inner wall of the groove, the actuating plunger is fixedly clamped with the clamp spring through the clamp spring groove, and the lower end of the actuating plunger penetrates out of the retaining cover to be arranged; the second spring is sleeved outside the execution plunger, two ends of the second spring are respectively propped against the execution plunger and the blocking cover, and the execution plunger can be driven to slide upwards to enable the clamp spring to be in contact with the upper end face of the annular limiting groove; the actuating cavity is positioned above the actuating plunger relative to the second oil way, and the actuating plunger is provided with a third position which keeps a certain braking clearance with the sliding pin and a fourth position which can be contacted with the sliding pin and drive the sliding pin to realize braking.
The lower end of the adjusting bolt is provided with a guide inclined plane.
And a locking nut is further arranged outside the adjusting bolt.
The control chamber is disposed in parallel with respect to the rocker shaft.
The control chamber is disposed vertically with respect to the rocker shaft and is disposed in the same plane as the actuating chamber.
The working principle of the hydraulic control type engine braking device is as follows:
when the engine works normally, inorganic oil in a brake oil way in the rocker arm shaft flows, the one-way control valve is in a second position under the action of the first spring, the execution plunger is in a third position under the action of the second spring, and a certain brake clearance is kept between the execution plunger and the sliding pin at the moment, so that the lift of the auxiliary cam does not work, the normal movement of the exhaust valve is not influenced, and the normal working of the engine is ensured.
When the hydraulic control engine braking device works, the electronic control unit of the engine sends out an instruction, the electromagnetic valve is opened, engine oil can flow into a braking oil way of the rocker shaft, the engine oil in the braking oil way enters into the control cavity through the first oil way, the one-way control valve is pushed to overcome the elastic force action of the first spring and move to the first position, then the engine oil enters into the execution cavity through the one-way control valve and the second oil way, engine oil in the execution cavity pushes the execution plunger to move downwards against the elastic force of the second spring and be in the fourth position, at the moment, a braking gap between the execution plunger and the sliding pin is eliminated, and the execution plunger pushes the sliding pin to open the exhaust valve near the top dead center of the compression stroke of the engine under the driving of the auxiliary cam, so that engine braking is realized.
When the hydraulic control engine braking device does not work, the electronic control unit of the engine sends out an instruction, the electromagnetic valve is closed, the engine oil pressure in the braking oil way of the rocker arm shaft is reduced or discharged by the electromagnetic valve, the one-way control valve is restored to the second position under the action of the first spring, meanwhile, the second oil way is opened, the execution plunger moves upwards to restore to the third position under the action of the second spring, engine oil in the execution cavity is discharged from the second oil way, and at the moment, the execution plunger and the sliding pin keep a certain braking gap, 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.
The beneficial effects of the invention are as follows: by adopting the scheme, the hydraulic control type engine braking device is simple and stable in structure, compact in space, stable and efficient in braking operation, and the whole height of the engine is not affected.
Drawings
Fig. 1 is a schematic front view of a hydraulic control engine brake device according to an embodiment of the present invention.
Fig. 2 is a schematic partial perspective view of a hydraulic control engine brake device according to an embodiment of the present invention.
Fig. 3 is a cross-sectional view of a hydraulically controlled engine brake device in accordance with an embodiment of the present invention.
FIG. 4 is a cross-sectional view of the auxiliary rocker arm and the control mechanism in a second position of the control mechanism according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view of the auxiliary rocker arm and actuator in a third position of the actuator according to an embodiment of the present invention.
FIG. 6 is a cross-sectional view of the auxiliary rocker arm and control mechanism with the control mechanism in a first position, in accordance with an embodiment of the present invention.
FIG. 7 is a cross-sectional view of the auxiliary rocker arm and actuator in a fourth position of the actuator according to an embodiment of the present invention.
Fig. 8 is a schematic perspective view of an auxiliary rocker arm according to an embodiment of the present invention.
Fig. 9 is a sectional view of an auxiliary rocker arm according to an embodiment of the present invention, shown in fig. 1.
Fig. 10 is a cross-sectional view 2 of an auxiliary rocker arm according to an embodiment of the present invention.
Fig. 11 is a schematic structural view of an adjusting bolt according to an embodiment of the present invention.
Fig. 12 is a cross-sectional view of an actuator plunger according to an embodiment of the present invention.
Detailed Description
Embodiments of the invention are further described below with reference to the accompanying drawings:
as shown in the figure, a hydraulic control type engine braking device comprises an exhaust valve 1, a sliding pin 2, a rocker arm shaft 3, a cam shaft 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, wherein both the first exhaust valve 11 and the second exhaust valve 12 adopt mushroom valves 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 contacted with the first exhaust valve 11, the other end of the sliding pin penetrates through the valve bridge 13, and when the sliding pin 2 receives 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 shaft 3 is arranged in parallel with the cam shaft 4, the cam shaft 4 is provided with an exhaust cam 41 and an auxiliary cam 42 which are adjacently arranged, and the rotation of the cam shaft 4 can drive the exhaust cam 41 and the auxiliary cam 42 to rotate at the same time.
The exhaust rocker arm 5 is rotatably mounted on the rocker shaft 3, and the front end of the exhaust rocker arm 5 is in corresponding contact with the valve bridge 13 and the rear end is in corresponding contact with the exhaust cam 41, so that the exhaust rocker arm 5 can rotationally oscillate around the rocker shaft 3 under the combined action of the exhaust cam 41 and the exhaust valve 1 as the cam shaft 4 rotates, thereby enabling the exhaust stroke of the exhaust valve 1 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 friction force between the exhaust cam 41 and the exhaust rocker arm 5 is greatly reduced, abrasion is reduced, and service life is prolonged.
The front end of the exhaust rocker arm 5 is further provided with an adjusting bolt 53, a pictogram 52 and a fastening nut 54, the pictogram 52 is pressed and installed at the lower end of the adjusting bolt 53 through a special tool, the pictogram 52 can freely rotate in a certain rotation angle, the upper end of the adjusting bolt 53 protrudes from 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 pictogram 52 is contacted with the valve bridge 13, and the contact effect with the valve bridge 13 is ensured along with the swinging action of the exhaust rocker arm 5 due to the higher degree of freedom of the pictogram 52, so that the working stability is ensured.
The auxiliary rocker arm 6 is rotatably mounted on the rocker arm shaft 3 and is disposed adjacent to the exhaust rocker arm 5, with its rear end corresponding to the auxiliary cam 42 and pressed into contact with the auxiliary cam 42 by the elastic member 7, so that the auxiliary cam 42 can drive the auxiliary rocker arm 6 to swing rotationally along the rocker arm shaft 3 when the camshaft 4 rotates.
Likewise, a second roller 65 can be installed at the rear end of the auxiliary rocker arm 6 through a second roller shaft, the second roller 65 is in contact with the auxiliary cam 42, rolling fit is formed between the auxiliary cam 42 and the second roller 65, friction force between the auxiliary cam 42 and the auxiliary rocker arm 6 is greatly reduced, abrasion is reduced, and service life is prolonged.
Wherein the auxiliary cam 42 includes a base circle and one or two peaches, for example, two peaches are provided in this embodiment, which respectively include a braking peach and an EGR peach or a BGR peach, the braking peach is used to provide a braking lift, the optional EGR peach can provide an EGR lift when the engine is doing positive work, and the optional BGR peach can provide a BGR lift when the engine is braking.
In addition, there are many alternative ways of providing the elastic element 7, in this embodiment, the elastic element 7 is a spring, one end of which is fixed to the rear end of the auxiliary rocker arm 6, and the other end of which is fixed to a spring bracket (not shown) which is fixed to the engine head or other fixed component, and the elastic element 7 has a sufficient spring force to bring the engine auxiliary rocker arm 6 into contact with the auxiliary cam 42 at all times 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 through which engine oil flows, and the brake oil path 31 is provided with an electromagnetic valve (shown in the figure), and 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, engine 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 engine oil cannot enter the brake oil path 31.
The auxiliary rocker arm 6 is also provided with a control chamber 61, an execution chamber 62, a first oil passage 63 and a second oil passage 64.
The actuating chamber 62 is disposed at the front end of the auxiliary rocker arm 6 and is disposed vertically with respect to the rocker arm shaft 3, and the lower end opening thereof is disposed in correspondence with the slide pin 2.
The control chamber 61 may be disposed in parallel with the rocker shaft 3 or may be disposed perpendicularly to the rocker shaft 3 and in the same plane as the actuator chamber 62, and one end of the control chamber 61 is open.
The first oil passage 63 communicates the brake oil passage 31 with the control chamber 61 and communicates with an end position of the control chamber 61, and the second oil passage 64 communicates with a side wall position of the control chamber 61 at one end and communicates with a side wall of the actuator chamber 62 near an upper end at the other end.
The control mechanism 8 is arranged in the control cavity 61 and comprises a one-way control valve 81, a first spring 82 and a check ring 83, the one-way control valve 81 is slidably arranged in the control cavity 61, the check ring 83 is arranged at the opening of the control cavity 61, the first spring 82 is arranged between the check ring 83 and the one-way control valve 81, when the organic oil in the brake oil circuit 31 enters the control cavity 61 through the first oil circuit 63, the one-way control valve 81 is pushed to slide to a first position against the elastic force of the first spring 82, and when the inorganic oil in the brake oil circuit 31 is in an inorganic oil, the first spring 82 pushes the one-way control valve 81 to return to a second position.
When the unidirectional control valve 81 is at the first position, the lateral outlet of the unidirectional control valve 81 just corresponds to the second oil path 64, so that engine oil can enter the execution cavity 62 through the unidirectional control valve 81 and the second oil path 64, and engine oil in the execution cavity 62 cannot flow back, and when the unidirectional control valve 81 is at the second position, the whole unidirectional control valve 81 is separated from the second oil path 64, so that engine oil in the execution cavity 62 can flow back to the control cavity 61 through the second oil path 64 to realize oil drainage.
The actuator 9 is disposed in the actuator chamber 62, and includes an adjusting bolt 91, a snap spring 92, a blocking cover 93, an actuator plunger 94, and a second spring 95.
The adjusting bolt 91 is arranged on the auxiliary rocker arm 6 and penetrates into the execution cavity 62 from top to bottom, and an annular limiting groove 911 is formed in the outer ring, close to the lower end, of the adjusting bolt 91; the clamping spring 92 is sleeved in the annular limiting groove 911, can slide up and down along the annular limiting groove 911 and is in limiting fit with the upper end and the lower end of the annular limiting groove 911; the blocking cover 93 is arranged at the opening of the lower end of the execution cavity 62.
The actuating plunger 94 is in a T shape and is disposed in the actuating chamber 62, a groove 941 adapted to the adjusting bolt 91 is formed at the upper end of the actuating plunger 94, a clamp spring groove 942 adapted to the clamp spring 92 is formed on the inner wall of the groove 941, and the clamp spring groove 942 is fixedly clamped with the clamp spring 92. During specific installation, the clamping spring 92 can be installed in the clamping spring groove 942 firstly, then the clamping spring 92 penetrates from the lower end of the adjusting bolt 91, so that the inner ring of the clamping spring 92 is clamped into the annular limiting groove 911, and in order to ensure easy and smooth installation, the lower end of the adjusting bolt 91 is chamfered, so that the guide inclined surface 912 is formed.
The lower end of the execution plunger 94 penetrates out of the baffle cover 93 to be arranged; the second spring 95 is sleeved outside the actuating plunger 94, and two ends of the second spring are respectively propped against the actuating plunger 94 and the blocking cover 93, so that the actuating plunger 94 can be driven to slide upwards to enable the snap spring 92 to be in contact with the upper end face of the annular limiting groove 911.
When the inorganic oil in the brake oil path 31 is pushed upwards by the second spring 95, the clamp spring is abutted against the upper end surface of the annular limiting groove, the execution plunger 94 is in the third position, when the organic oil in the brake oil path 31 enters the control cavity 61 through the first oil path 63, the one-way control valve 81 is pushed to slide to the first position against the elastic force of the first spring 82, and at the moment, the engine oil in the control cavity 61 enters the execution cavity 62 through the one-way control valve 81 and the second oil path 64, and the execution plunger 94 is pushed to slide to the fourth position against the elastic force of the second spring 95.
When the actuating plunger 94 is in the third position, it maintains a certain braking clearance with the slide pin 2, so that the lift of the auxiliary cam is not active and does not affect the normal movement of the exhaust valve, and when the actuating plunger 94 is in the fourth position, the distance between the actuating plunger 94 and the slide pin 2 is reduced, and the braking clearance is eliminated, so that the actuating plunger pushes the slide pin to open the exhaust valve near the top dead center of the compression stroke of the engine under the driving of the auxiliary cam.
In addition, the adjustment of the distance between the actuating plunger 94 and the slide pin 2 can be achieved by means of the adjusting screw 91. Wherein, adjusting bolt 91 still is equipped with lock nut 96 outward, ensures that adjusting bolt 91 can not become flexible, and the structure is more stable.
The working principle of the hydraulic control type engine braking device is as follows:
when the engine works normally, inorganic oil in the brake oil way 31 in the rocker shaft 3 circulates, the one-way control valve 81 is in the second position under the action of the first spring 82, the execution plunger 94 is in the third position under the action of the second spring 95, and at the moment, the execution plunger 94 and the sliding pin 2 keep a certain braking 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 hydraulic control engine braking device works, an electronic control unit of the engine sends out an instruction, an electromagnetic valve is opened, engine oil can flow into a braking oil path 31 of a rocker shaft 3, the engine oil in the braking oil path 31 enters into a control cavity 61 through a first oil path 63, a one-way control valve 81 is pushed to overcome the elastic force of a first spring 82 and move to a first position, then the engine oil enters into an execution cavity 62 through the one-way control valve 81 and a second oil path 64, an execution plunger 94 is pushed to move downwards against the elastic force of a second spring 95 and is in a fourth position, at this time, a braking gap between the execution plunger 94 and a sliding pin 2 is eliminated, and the execution plunger pushes the sliding pin to open an exhaust valve near the upper dead center of a compression stroke of the engine under the driving of an auxiliary cam, so that engine braking is realized.
When the hydraulic control engine braking device does not work, the electronic control unit of the engine sends out an instruction, the electromagnetic valve is closed, the engine oil pressure in the braking oil way 31 of the rocker arm shaft 3 is reduced or discharged by the electromagnetic valve, the one-way control valve 81 is restored to the second position under the action of the first spring 82, meanwhile, the second oil way 64 is opened, the execution plunger 94 moves upwards to restore to the third position under the action of the second spring 95, the engine oil in the control cavity is discharged through the second oil way 64, and at the moment, the execution plunger 94 and the sliding pin 2 keep a certain braking gap, 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.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, 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 explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
The skilled person will know: while the invention has been described in terms of the foregoing embodiments, the inventive concepts are not limited to the invention, and any modifications that use the inventive concepts are intended to be within the scope of the appended claims.
Claims (3)
1. A hydraulically controlled engine brake device 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);
a sliding pin (2) arranged in the valve bridge (13), one end of the sliding pin is contacted with the first exhaust valve (11), and the other end of the sliding pin penetrates through the valve bridge (13);
a rocker shaft (3) having a brake oil passage (31) through which engine oil flows;
a camshaft (4) which is disposed in parallel with the rocker shaft (3) and has an exhaust cam (41) and an auxiliary cam (42) that are disposed adjacently;
an exhaust rocker arm (5) rotatably mounted on the rocker shaft (3) and having a front end in corresponding contact with the valve bridge (13) and a rear end in corresponding contact with the exhaust cam (41);
an auxiliary rocker arm (6) rotatably mounted on the rocker arm shaft (3) and disposed adjacent to the exhaust rocker arm (5), the rear end of the auxiliary rocker arm corresponding to the auxiliary cam (42), a control chamber (61), an execution chamber (62), and a first oil passage (63) communicating the brake oil passage (31) with the control chamber (61) and a second oil passage (64) communicating the control chamber (61) with the execution chamber (62) are also provided on the auxiliary rocker arm (6), and the execution chamber (62) is positioned at the front end of the auxiliary rocker arm (6) and the opening of the lower end thereof corresponds to the slide pin (2);
an elastic element (7) capable of holding the auxiliary rocker arm (6) in contact with the auxiliary cam (42);
the method is characterized in that: and also comprises
The control mechanism (8) is arranged in the control cavity (61) and comprises a one-way control valve (81), a first spring (82) and a check ring (83), the one-way control valve (81) is movably arranged in the control cavity (61), the check ring (83) is arranged at an opening of the control cavity (61), the first spring (82) is arranged between the check ring (83) and the one-way control valve (81), and the one-way control valve (81) is provided with a first position for pushing the one-way closed second oil way (64) by engine oil and a second position for pushing the opened second oil way (64) by the first spring (82);
the actuating mechanism (9) is arranged in the actuating cavity (62) and comprises an adjusting bolt (91), a clamp spring (92), a blocking cover (93), an actuating plunger (94) and a second spring (95); the adjusting bolt (91) is arranged on the auxiliary rocker arm (6) and penetrates into the execution cavity (62) from top to bottom, an annular limiting groove (911) is formed in the outer ring, close to the lower end, of the adjusting bolt (91), and a guide inclined plane (912) is formed in the lower end of the adjusting bolt (91); the clamp spring (92) is sleeved in the annular limiting groove (911), can slide up and down along the annular limiting groove (911) and is in limit fit with the upper end and the lower end of the annular limiting groove (911); the baffle cover (93) is arranged at the opening of the lower end of the execution cavity (62); the execution plunger (94) is T-shaped and is arranged in the execution cavity (62), a groove (941) matched with the adjusting bolt (91) is formed at the upper end of the execution plunger (94), a clamp spring groove (942) matched with the clamp spring (92) is formed in the inner wall of the groove (941), the execution plunger is fixedly clamped with the clamp spring (92) through the clamp spring groove (942), and the lower end of the execution plunger (94) penetrates out of the baffle cover (93) to be arranged; the second spring (95) is sleeved outside the execution plunger (94), two ends of the second spring are respectively propped against the execution plunger (94) and the blocking cover (93), and the execution plunger (94) can be driven to slide upwards to enable the clamp spring (92) to be in contact with the upper end face of the annular limiting groove (911); a lock nut (96) is further arranged outside the adjusting bolt (91);
the actuating chamber (62) is located above the actuating plunger (94) relative to the second oil path (64), and the actuating plunger (94) is provided with a third position which keeps a certain braking clearance with the sliding pin (2) and a fourth position which can be contacted with the sliding pin (2) and drive the sliding pin (2) to realize braking.
2. The hydraulically controlled engine brake device of claim 1, wherein: the control chamber (61) is arranged in parallel with respect to the rocker shaft (3).
3. The hydraulically controlled engine brake device of claim 1, wherein: the control chamber (61) is arranged vertically with respect to the rocker shaft (3) and is arranged in the same plane as the actuating chamber (62).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910850881.9A CN110425015B (en) | 2019-09-10 | 2019-09-10 | Hydraulic control type engine braking device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910850881.9A CN110425015B (en) | 2019-09-10 | 2019-09-10 | Hydraulic control type engine braking device |
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| CN110425015A CN110425015A (en) | 2019-11-08 |
| CN110425015B true CN110425015B (en) | 2024-02-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112065525B (en) * | 2020-09-09 | 2021-11-19 | 潍柴动力股份有限公司 | Rocker arm mechanism and engine assembly |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202926418U (en) * | 2012-09-10 | 2013-05-08 | 浙江亿日气动科技有限公司 | Frame type air valve executing device with auxiliary rocker arm and driven by auxiliary cam |
| CN207864059U (en) * | 2017-12-18 | 2018-09-14 | 东风商用车有限公司 | A kind of engine braking executing agency |
| CN108661745A (en) * | 2018-07-10 | 2018-10-16 | 浙江黎明发动机零部件有限公司 | A kind of electromagnetic control type engine braking apparatus |
| CN109958492A (en) * | 2019-03-22 | 2019-07-02 | 东风商用车有限公司 | A kind of adjustable type engines brake actuator and its application method |
| CN110107373A (en) * | 2019-04-23 | 2019-08-09 | 东风商用车有限公司 | A kind of the engine air raft of pontoons structure and its control method of lift range variable |
| CN210396841U (en) * | 2019-09-10 | 2020-04-24 | 浙江黎明智造股份有限公司 | Hydraulic control type engine braking device |
-
2019
- 2019-09-10 CN CN201910850881.9A patent/CN110425015B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202926418U (en) * | 2012-09-10 | 2013-05-08 | 浙江亿日气动科技有限公司 | Frame type air valve executing device with auxiliary rocker arm and driven by auxiliary cam |
| CN207864059U (en) * | 2017-12-18 | 2018-09-14 | 东风商用车有限公司 | A kind of engine braking executing agency |
| CN108661745A (en) * | 2018-07-10 | 2018-10-16 | 浙江黎明发动机零部件有限公司 | A kind of electromagnetic control type engine braking apparatus |
| CN109958492A (en) * | 2019-03-22 | 2019-07-02 | 东风商用车有限公司 | A kind of adjustable type engines brake actuator and its application method |
| CN110107373A (en) * | 2019-04-23 | 2019-08-09 | 东风商用车有限公司 | A kind of the engine air raft of pontoons structure and its control method of lift range variable |
| CN210396841U (en) * | 2019-09-10 | 2020-04-24 | 浙江黎明智造股份有限公司 | Hydraulic control type engine braking device |
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