CN108661745B - Electromagnetic control type engine braking device - Google Patents
Electromagnetic control type engine braking device Download PDFInfo
- Publication number
- CN108661745B CN108661745B CN201810749212.8A CN201810749212A CN108661745B CN 108661745 B CN108661745 B CN 108661745B CN 201810749212 A CN201810749212 A CN 201810749212A CN 108661745 B CN108661745 B CN 108661745B
- Authority
- CN
- China
- Prior art keywords
- rocker arm
- cam
- sleeve
- push rod
- engine brake
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000007246 mechanism Effects 0.000 claims abstract description 22
- 235000006040 Prunus persica var persica Nutrition 0.000 claims description 18
- 239000003921 oil Substances 0.000 claims description 17
- 244000144730 Amygdalus persica Species 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 10
- 240000005809 Prunus persica Species 0.000 claims description 5
- 239000010687 lubricating oil Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 2
- 239000010705 motor oil Substances 0.000 abstract description 25
- 238000000034 method Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000000446 fuel Substances 0.000 abstract description 4
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 238000005461 lubrication Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000003993 interaction Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
-
- 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
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
- F01L9/21—Valve-gear or valve arrangements actuated non-mechanically by electric means actuated by solenoids
Abstract
An electromagnetically controlled engine brake device. The method is characterized in that: the electromagnetic driving mechanism at least comprises a push rod capable of moving up and down, and is controlled to move by an electromagnetic controller, and the electromagnetic driving mechanism comprises a first position keeping a certain gap with the sliding pin and a second position keeping contact with the sliding pin. The advantages are that: an auxiliary rocker arm is added, an electromagnetic driving mechanism controlled by an electromagnetic controller to act is arranged to replace the existing engine oil used as a working or driving control medium, the reliability risk brought by the engine oil is eliminated, the engine braking application area is increased, the engine braking entering and exiting time is shortened, the fuel consumption is reduced, and the engine braking performance classification is finer.
Description
Technical Field
The invention provides an electromagnetic control type engine braking device which is applied to medium and heavy diesel and natural gas engines.
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 one or several additional auxiliary lifts outside the main lift of the cam, and also adding a cam specially used for braking, the engine braking device can make the auxiliary lift active (implement engine braking function) or make it inactive according to the requirement of engine operation.
Patent CN200980158946.8 is a dedicated rocker arm engine brake applied by jacobs vehicle systems company and discloses a system for actuating engine exhaust valves that includes a rocker shaft having a control fluid supply passage, and an exhaust rocker arm pivotally mounted to the rocker shaft. The engine brake rocker arm may have: a central opening, a hydraulic passage connecting the central opening with the control valve, and a fluid passage connecting the control valve with the actuator piston assembly. Patent CN201080019296.1 is a jacobs vehicle system company applied lost motion variable valve braking system for engine braking and early exhaust valve opening, which 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 braking or early exhaust valve opening braking 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 patents all use engine oil as a medium for transmitting the motion law of the valve, and the motion law of the braking valve is greatly dependent on some characteristics of the engine oil, such as the lift of the braking valve is lost when the air content of the engine oil is too high, thereby affecting the braking performance. In addition, when the temperature of the engine oil is too low and the viscosity of the engine oil is too high, the normal operation of engine braking is also affected. Therefore, the engine brake technology requires that the engine oil temperature is higher than a certain limit value (such as 40 ℃) so that the engine brake can be inserted, and thus the service condition of the engine brake can be limited. And further, as engine braking driven by engine oil is adopted, the intervention and withdrawal time of the engine braking is generally longer (more than 0.4 s), so that the switching process of the engine braking and the ignition state is influenced, and the transient switching process of the engine is unstable.
Disclosure of Invention
In order to overcome the defects of the background technology, the invention provides an electromagnetic control type engine braking device.
The invention adopts the technical scheme that: an electromagnetic control type engine braking device, which comprises a first exhaust valve, a second exhaust valve and further comprises:
a rocker shaft;
a camshaft parallel to the rocker shaft and having a first cam and a second cam disposed adjacently;
an exhaust rocker arm rotatably mounted on the rocker arm shaft, the rear end of which corresponds to the first cam;
an auxiliary rocker arm rotatably mounted on the rocker arm shaft and adjacent to the exhaust rocker arm with its rear end corresponding to the second cam;
the valve bridge is transversely arranged on the first exhaust valve and the second exhaust valve, is fixedly connected with the front end of the exhaust rocker arm and can press the exhaust rocker arm to be in contact with the first cam;
an elastic member capable of pressing the auxiliary rocker arm into contact with the second cam;
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;
the electromagnetic driving mechanism is arranged at the front end of the auxiliary rocker arm and corresponds to the sliding pin, and at least comprises a push rod capable of moving up and down and controlled by the electromagnetic controller to move, and the push rod is provided with a first position keeping a certain gap with the sliding pin and a second position keeping contact with the sliding pin.
The electromagnetic control mechanism further comprises a push rod, a sleeve, a spring and a spring seat; the sleeve is fixedly arranged at the front end of the auxiliary rocker arm, N groups of first sliding grooves which are uniformly distributed in the circumferential direction and N groups of second sliding grooves which are uniformly distributed in the circumferential direction are arranged on the inner wall of the sleeve, the first sliding grooves and the second sliding grooves are distributed at intervals, a positioning boss is formed between the first sliding grooves and the second sliding grooves, a first inclined surface structure is formed at the bottom of the positioning boss, wherein the diameter of the first sliding grooves is A, the diameter of the second sliding grooves is B, A is more than B, and N is more than or equal to 3; the push rod is arranged in the sleeve, 2N first strip-shaped bosses are uniformly arranged on the outer side of the push rod in the circumferential direction, the first strip-shaped bosses are respectively embedded into the first sliding groove and the second sliding groove and can move up and down along the first sliding groove and the second sliding groove, and a sawtooth structure which is uniformly distributed in the circumferential direction is formed on the lower end face of the push rod; the ejector rod is arranged in the sleeve and positioned at the lower end of the push rod, N second strip-shaped bosses are uniformly arranged on the outer side of the ejector rod in the circumferential direction, the diameter of each second strip-shaped boss is C, A is more than C and more than B, the second strip-shaped bosses can be embedded into the first sliding groove, and a second inclined surface structure is formed at the top of each second strip-shaped boss; the spring seat is fixed at the bottom of the sleeve, the spring is sleeved on the ejector rod, and two ends of the spring are respectively abutted against the spring seat and the ejector rod; the electromagnetic controller is arranged above the sleeve and is contacted with the upper end face of the push rod, and the lower end of the push rod passes through the spring seat and corresponds to the sliding pin.
The first sliding groove and the second sliding groove are respectively provided with 4 groups, the first bar-shaped bosses are provided with 8 groups, and the second bar-shaped bosses are provided with 4 groups.
The sleeve is provided with a clamping groove at the position close to the bottom, a clamping spring is arranged in the clamping groove, and the spring seat is arranged on the clamping spring.
The auxiliary rocker arm front end is equipped with the screw hole, the sleeve outside is formed with external screw thread structure, the sleeve passes through screw-thread fit fixed mounting in screw hole.
The top of the sleeve protrudes from the top of the threaded hole and is fixedly locked through a fastening nut.
The second cam includes a base circle and one or more peaches.
The peaches include a brake peach and an EGR peach or BGR peach.
The rear end of the auxiliary rocker arm is provided with a bulge towards the side; the elastic piece adopts a plate spring, one end of the elastic piece is fixedly pressed on the rocker arm shaft, and the other end of the elastic piece is pressed on the bulge, so that the auxiliary rocker arm is always contacted with the second cam.
The protrusion is cylindrical.
The rocker arm shaft is internally provided with an oil way, the auxiliary rocker arm is internally provided with a lubricating oil way capable of communicating the oil way, and the lubricating oil way is led to the electromagnetic driving mechanism.
The rear end of the exhaust rocker arm is provided with a first roller, and the first roller is in contact with the first cam.
The rear end of the auxiliary rocker arm is provided with a second roller, and the second roller is in contact with the second cam.
The front end of the exhaust rocker arm is fixedly connected with an adjusting bolt, and the lower end of the adjusting bolt is connected with the valve bridge through an image angle.
The upper end of the adjusting bolt protrudes from the top of the front end of the exhaust rocker arm and is locked and fixed through a locking nut.
The working process of the electromagnetic control type engine braking device comprises the following steps:
when the engine works normally, the ejector rod is in a first position under the control of the electromagnetic controller, keeps a certain gap with the sliding pin, and does not act on the first exhaust valve;
when the electromagnetic control type engine braking device works, the ejector rod is in a second position under the control of the electromagnetic controller and is contacted with the sliding pin, and the action of the auxiliary rocker arm opens the first exhaust valve to realize engine braking or internal EGR;
when the electromagnetic control type engine braking device does not work, the ejector rod returns to the first position under the control of the electromagnetic controller, keeps a certain gap with the sliding pin, and does not work on the first exhaust valve.
The beneficial effects of the invention are as follows: 1. eliminating reliability risks brought by using engine oil: the engine braking device is driven by an electromagnetic controller, so that the problems of unstable idling and white smoke generation caused by the false start of a braking function due to high viscosity and high pressure of engine oil when the engine is started are solved;
2. increasing engine brake application area: the existing hydraulic or fixed chain engine brake uses engine oil as a working medium, so that certain requirements on the engine oil temperature and the engine oil pressure are met, and if the engine oil temperature is more than 40 ℃, the engine brake can be interposed, so that the engine brake is limited to be used when the whole vehicle is just started, and the electromagnetic controller is not limited by the conditions to be used when the electromagnetic controller is used for driving, and the electromagnetic engine brake can be used at any time after the whole vehicle is started;
3. the engine brake entering and exiting time is obviously shortened: the traditional hydraulic or fixed chain engine brake uses engine oil as a working medium or a driving control medium, so that the entering and exiting time of the engine brake is long, generally 0.2-0.4 s is needed, and the electromagnetic controller can adopt a single-cylinder independent power supply strategy according to the current position of a cam shaft, so that the switching of positive work and negative work can be completed in one rotation of the cam shaft, and the entering and exiting speed of the engine brake is improved;
4. engine braking performance grading is finer: the traditional engine braking generally adopts two electromagnetic valves to control the in and out of engine oil in a braking oil way, the engine braking performance can be divided into two grades, and the electromagnetic controller of each cylinder can be used for realizing independent control, so that the braking performance of a six-cylinder engine can be divided into six grades, the finely divided benefits are more flexible (such as smaller braking performance requirement when the whole engine is in idle load), and the engine braking performance control during automatic cruising and the speed reduction during gear shifting of the automatic gearbox are both greatly beneficial;
5. the fuel consumption of the engine is reduced: the electromagnetic controller does not need engine oil as a driving medium, and the engine oil demand and the oil supply capacity of an engine oil pump can be properly reduced, so that the reduction of fuel consumption is facilitated.
Drawings
Fig. 1 is a schematic structural diagram of an electromagnetic control type engine brake device according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of an electromagnetic control type engine brake device in the normal operation of the engine according to the embodiment of the present invention.
Fig. 3 is a cross-sectional view of an electromagnetic control type engine brake device at the time of engine brake operation according to an embodiment of the present invention.
FIG. 4 is an exploded view of an auxiliary rocker arm and electromagnetic control mechanism according to an embodiment of the present invention.
Fig. 5 is a cross-sectional view of an electromagnetic control mechanism according to an embodiment of the present invention.
Fig. 6 is a top view of a sleeve according to an embodiment of the present invention.
Fig. 7 is a cross-sectional view of a sleeve according to an embodiment of the present invention.
Fig. 8 is a top view of a putter in accordance with an embodiment of the present invention.
Fig. 9 is a front view of a putter in accordance with an embodiment of the present invention.
Fig. 10 is a top view of an ejector pin according to an embodiment of the present invention.
FIG. 11 is a front view of a carrier bar according to an embodiment of the present invention.
In the figure, 1-rocker arm shaft, 2-camshaft, 21-first cam, 22-second cam, 3-exhaust rocker arm, 31-first roller, 32-adjusting bolt, 33-image angle, 34-lock nut, 4-auxiliary rocker arm, 41-threaded hole, 42-protrusion, 43-lubrication oil path, 44-second roller, 5-valve bridge, 6-elastic piece, 7-slide pin, 8-electromagnetic driving mechanism, 81-push rod, 811-first bar boss, 812-saw tooth structure, 82-push rod, 821-second bar boss, 822-second inclined plane structure, 83-sleeve, 831-first slide groove, 832-second slide groove, 833-positioning boss, 834-first inclined plane structure, 835-clamp groove, 84-spring, 85-spring seat, 86-clamp spring, 87-clamp nut, 9-electromagnetic valve, 10-, 11-first exhaust valve, 12-second exhaust valve.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
In the description of the present invention, it should be noted that the terms "front," "rear," "upper," "lower," and the like indicate or are defined for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the 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.
As shown in the figure, an electromagnetic control type engine brake apparatus includes a first exhaust valve 11, a second exhaust valve 12, a rocker shaft 1, a camshaft 2, an exhaust rocker arm 3, an auxiliary rocker arm 4, a valve bridge 5, an elastic member 6, a slide pin 7, and an electromagnetic drive mechanism 8.
The first exhaust valve 11 and the second exhaust valve 12 are mushroom valves for controlling the flow of gas between a combustion chamber and an intake and exhaust manifold in the engine.
The camshaft 2 is arranged in parallel with the rocker shaft 1, and a first cam 21 and a second cam 22 which are adjacently arranged are arranged on the camshaft 2; the exhaust rocker arm 3 is rotatably mounted on the rocker shaft 1 adjacent to the auxiliary rocker arm 4, the rear end of the exhaust rocker arm 3 corresponds to the first cam 21, and the rear end of the auxiliary rocker arm 4 corresponds to the second cam 22.
The valve bridge 5 is transversely arranged on the first exhaust valve 11 and the second exhaust valve 12 and fixedly connected with the front end of the exhaust rocker arm 3, and can press the exhaust rocker arm 3 into contact with the first cam 21, so that when the camshaft 2 rotates, the first cam 21 can drive the exhaust rocker arm 3 to rotate and swing along the rocker shaft 1, and the first exhaust valve 11 and the second exhaust valve 12 can be simultaneously driven by the valve bridge 5 to realize an exhaust stroke.
Wherein, can be in exhaust rocking arm 3 rear end passes through first roller shaft installation first gyro wheel 31, first gyro wheel 31 and first cam 21 contact form rolling fit between first cam 21 and the first gyro wheel 31, the frictional force between first cam 21 and the exhaust rocking arm 3 that has significantly reduced reduces wearing and tearing, improves life.
In addition, the valve bridge 5 and the exhaust rocker arm 3 can be connected with the image angle 33 through an adjusting bolt 32, the adjusting bolt 32 is arranged at the front end of the exhaust rocker arm 3, the image angle 33 is pressed at the lower end of the adjusting bolt 32 through a special tool, and the image angle 33 can freely rotate in a certain rotation angle.
Further, the upper end of the adjusting bolt 32 protrudes from the top of the front end of the exhaust rocker arm 3, and is locked and fixed through the locking nut 34, so that the connection is firmer and more reliable.
The elastic member 6 is used to press the auxiliary rocker arm 4 into contact with the second cam 22, so that the second cam 22 can drive the auxiliary rocker arm 4 to swing rotationally along the rocker shaft 1 when the camshaft 2 rotates.
Similarly, a second roller 44 can be installed at the rear end of the auxiliary rocker arm 4 through a second roller shaft, the second roller 44 is in contact with the second cam 22, rolling fit is formed between the second cam 22 and the second roller 44, friction force between the second cam 22 and the auxiliary rocker arm 4 is greatly reduced, abrasion is reduced, and service life is prolonged.
In addition, the elastic member 6 may be provided with a cylindrical protrusion 42 at the rear end of the auxiliary rocker arm 4 to the side; the elastic member 6 is selected as a plate spring, one end of which is fixedly pressed against the rocker arm shaft 1 and the other end of which is pressed against the projection 42, so that the auxiliary rocker arm 4 is always in contact with the second cam 22. Of course, other forms of springs, torsion springs, etc. may be employed.
The sliding pin 7 is arranged in the valve bridge 5, one end of the sliding pin 7 is in contact with the first exhaust valve 11, and the other end of the sliding pin penetrates through the valve bridge 5; the electromagnetic driving mechanism 8 is arranged at the front end of the auxiliary rocker arm 4 and corresponds to the sliding pin 7, the electromagnetic driving mechanism 8 at least comprises a push rod 82 which can move up and down and is controlled by the electromagnetic controller 9 to move, and the push rod 82 has a first position keeping a certain gap with the sliding pin 7 and a second position keeping contact with the sliding pin 7.
When the engine is working normally, the ejector rod 82 is in the first position under the control of the electromagnetic controller 9, keeps a certain clearance with the sliding pin 7, and does not work on the first exhaust valve 11.
When the electromagnetic control type engine braking device works, the ejector rod 82 is in the second position under the control of the electromagnetic controller 9 and is in contact with the sliding pin 7, and the action of the auxiliary rocker arm 4 opens the first exhaust valve 11 to realize engine braking or internal EGR.
When the electromagnetic control type engine brake is not operated, the ejector rod 82 returns to the first position under the control of the electromagnetic controller 9, maintains a certain clearance with the sliding pin 7, and does not act on the first exhaust valve 11.
The electromagnetic controller 9 is adopted to realize drive control, oil is used as working medium or drive control medium in the existing conventional hydraulic or fixed chain engine brake, the problems of unstable idle speed and white smoke generation caused by the false start of a brake function due to high viscosity of the engine oil and high pressure of the engine oil are solved, the engine is safer and more reliable, the engine is not limited by the requirements of the engine oil temperature, the engine oil pressure and the like, the engine can be used at any time after the whole vehicle is started, the range of the use area is wider, the engine brake entering and exiting time is obviously shortened, and the fuel consumption of the engine is reduced.
Wherein the second cam 22 includes a base circle 221 and one or two peaches 222. For example, two peaches include a brake peach, an EGR peach, or a BGR peach that actuates auxiliary rocker arm 4 to effect auxiliary valve events, the brake peach providing a braking lift, the optional EGR peach providing an EGR lift when the engine is doing positive work, and the optional BGR peach providing a BGR lift when the engine is braking.
As shown, the electromagnetic control mechanism 8 further includes a push rod 81, a sleeve 83, a spring 84, and a spring seat 85.
The sleeve 83 is fixedly installed at the front end of the auxiliary rocker arm 4, the inner wall of the sleeve is provided with 4 groups of first sliding grooves 831 uniformly distributed in the circumferential direction and 4 groups of second sliding grooves 832 uniformly distributed in the circumferential direction, the first sliding grooves 831 and the second sliding grooves 832 are distributed at intervals, a structure of a positioning boss 833 is formed between the first sliding grooves 831 and the second sliding grooves 832, a first inclined surface structure 834 is formed at the bottom of the positioning boss 833, wherein the diameter of the first sliding grooves 831 is A, the second sliding grooves 832 are B, and A is more than B.
Of course, the number of the first sliding grooves 831 and the second sliding grooves 832 is not limited to 4 groups, but may be 3 groups or 5 groups.
In addition, the front end of the auxiliary rocker arm 4 is provided with a threaded hole 41, an external thread structure is formed outside the sleeve 83, the sleeve 83 is fixedly installed in the threaded hole 41 through threaded fit, and the installation is very convenient and firm through threaded fit.
Further, the top of the sleeve 83 protrudes from the top of the threaded hole 41, and further fixing and locking are achieved through the fastening nut 87, so that connection is firmer and more reliable.
The push rod 81 is installed in the sleeve 83, 8 first bar-shaped bosses 811 are uniformly arranged on the outer side of the push rod 81 in the circumferential direction, the first bar-shaped bosses 811 are respectively embedded in the first sliding groove 831 and the second sliding groove 832 and can move up and down along the first sliding groove 831 and the second sliding groove 832, and a saw-tooth structure 812 uniformly distributed in the circumferential direction is formed on the lower end face of the push rod 81.
Of course, the number of the first bar-shaped bosses 811 is not limited to 8, and is the sum of the first sliding grooves 831 and the second sliding grooves 832.
The ejector rod 82 is installed in the sleeve 83 and is located at the lower end of the push rod 81, 4 second strip-shaped bosses 821 are uniformly arranged on the outer side of the ejector rod 82 in the circumferential direction, the diameter of each second strip-shaped boss 821 is C, A is larger than C and larger than B, each second strip-shaped boss 821 can be embedded into the corresponding first sliding groove 831 and cannot be embedded into the corresponding second sliding groove 832, a second inclined surface structure 822 is formed at the top of each second strip-shaped boss 821, and the second inclined surface structure 822 can be matched with the corresponding sawtooth structure 812 and the corresponding first inclined surface structure 834.
Similarly, the number of the second bar-shaped bosses 821 is not limited to 4, and corresponds to the number of the first sliding grooves 831 and the second sliding grooves 832.
The sleeve 83 is provided with a clamping groove 835 near the bottom, a clamp spring 86 is arranged in the clamping groove 835, a spring seat 85 is arranged on the clamp spring 86, the spring 84 is sleeved on the ejector rod 82, and two ends of the spring 84 respectively contact with the spring seat 85 and the ejector rod 82, so that the ejector rod 82 can be driven to move upwards.
The electromagnetic controller 9 is arranged above the sleeve 83 and is contacted with the upper end face of the push rod 81, and the lower end of the push rod 82 passes through the spring seat 85 to correspond to the sliding pin 7.
When the engine works normally, the electromagnetic controller 9 is closed, the second strip-shaped boss 821 of the ejector rod 82 is just embedded in the first sliding groove 831, and meanwhile, the second strip-shaped boss 821 is kept at the highest position under the action of the spring 84, so that the ejector rod 82 keeps a certain clearance with the sliding pin 7, and the action of the auxiliary rocker arm 4 does not act on the first exhaust valve 11.
When the electromagnetic control type engine braking device works, the electromagnetic controller 9 is started, the execution plunger of the electromagnetic controller moves downwards, the execution plunger of the electromagnetic controller pushes the push rod 81 to move downwards, the push rod 81 pushes the push rod 82 to move downwards until the second strip-shaped boss 821 is separated from the first sliding groove 831, at this time, the interaction force generated between the sawtooth structure 812 at the bottom of the push rod 81 and the second inclined surface structure 822 on the push rod 82 enables the push rod 82 to rotate by a certain angle, then the electromagnetic controller 9 is closed, the execution plunger of the electromagnetic controller moves upwards to reset, the push rod 82 moves upwards under the action of the spring 84, at this time, the interaction force generated between the second inclined surface structure 822 on the push rod 82 and the first inclined surface structure 834 of the sleeve 83 enables the push rod 82 to rotate by a certain angle and slightly move upwards again, so that the second strip-shaped boss 821 corresponds to the second sliding groove 832, and the push rod 82 cannot move upwards continuously because the second strip-shaped boss 821 cannot be embedded into the second sliding groove 832, so that the push rod 82 is kept at a lower position, the push rod 82 can contact with the sliding pin 7, the lower end of the push rod 82 reaches the locking position, at this time, the action of the auxiliary rocker arm 4 can start the first exhaust valve 11 or the internal engine braking.
When the electromagnetic control type engine braking device does not work, the electromagnetic controller 9 is started, the execution plunger of the electromagnetic controller descends, the execution plunger of the electromagnetic controller pushes the push rod 81 to move downwards, the push rod 81 pushes the push rod 82 to move downwards, the second inclined surface structure 822 on the push rod 82 is separated from the first inclined surface structure 834 of the sleeve 83, meanwhile, the interaction force generated between the sawtooth structure 812 at the bottom of the push rod 81 and the second inclined surface structure 822 on the push rod 82 enables the push rod 82 to rotate a certain angle again, then the electromagnetic controller 9 is closed, the execution plunger of the electromagnetic controller moves upwards to reset, the push rod 82 moves upwards under the action of the spring 84, at the moment, the interaction force generated between the second inclined surface structure 822 on the push rod 82 and the first inclined surface structure 834 of the sleeve 83 enables the push rod 82 to rotate a certain angle again, the second strip-shaped boss 821 corresponds to the first sliding groove 831, then the second strip-shaped boss 821 is embedded into the first sliding groove 831, the second strip-shaped boss 821 is kept at the highest position, a certain gap is kept between the push rod 82 and the sliding pin 7, and the action of the auxiliary rocker arm 4 does not act on the first 11.
An electromagnetic controller 9 is used for controlling and driving an electromagnetic control mechanism 8 to work independently, so that the braking performance of a six-cylinder engine can be divided into six levels, the benefits of subdivision are more flexible (such as smaller braking performance requirements when the whole vehicle is unloaded) and the brake control device has great benefits for the speed control of the whole vehicle during automatic cruising and the speed reduction of the engine during gear shifting of an automatic gearbox.
Meanwhile, the electromagnetic control mechanism 8 is structured by the push rod 81, the push rod 82, the sleeve 83, the spring 84, the spring seat 85 and the like, so that the push rod 82 is in a locking state of keeping contact with the sliding pin 7 and an unlocking state of keeping a distance with the sliding pin 7, therefore, after the electromagnetic controller 9 is opened each time, only one power for switching the position state of the push rod 82 is provided, and after the position state of the push rod 82 is switched, the electromagnetic controller 9 can be closed and reset, so that the work is more stable, the electromagnetic controller 9 is protected, and the service life is prolonged.
Of course, the electromagnetic control mechanism 8 may be in the form of a push rod only, and the contact with or separation from the slide pin 7 may be directly maintained by the driving force of the electromagnetic controller 9.
In addition, as shown in fig. 2-3, the rocker arm shaft 1 is provided with an oil passage 10, the auxiliary rocker arm 4 is provided with a lubrication oil passage 43 capable of communicating with the oil passage 10, the lubrication oil passage 43 is led to a threaded hole 42, and engine oil enters the electromagnetic control mechanism 8 through the oil passage 10 of the rocker arm shaft 1 and the lubrication oil passage 43 of the auxiliary rocker arm 4 to supply lubrication oil to each component in the electromagnetic control mechanism 8.
The examples should not be construed as limiting the invention, but any modifications based on the spirit of the invention should be within the scope of the invention.
Claims (14)
1. An electromagnetic control type engine braking device, comprising a first exhaust valve (11) and a second exhaust valve (12), characterized in that the device further comprises:
a rocker shaft (1);
a camshaft (2) parallel to the rocker shaft (1) and having a first cam (21) and a second cam (22) arranged adjacently;
an exhaust rocker arm (3) rotatably mounted on the rocker shaft, the rear end of which corresponds to the first cam (21);
an auxiliary rocker arm (4) rotatably mounted on the rocker arm shaft and adjacent to the exhaust rocker arm, the rear end of which corresponds to the second cam (22);
the valve bridge (5) is transversely arranged on the first exhaust valve (11) and the second exhaust valve (12), is fixedly connected with the front end of the exhaust rocker arm (3), and can press the exhaust rocker arm (3) to be in contact with the first cam (21);
an elastic member (6) capable of pressing the auxiliary rocker arm (4) into contact with the second cam (22);
the sliding pin (7) is arranged in the valve bridge (5), one end of the sliding pin (7) is contacted with the first exhaust valve (11), and the other end of the sliding pin penetrates through the valve bridge (5);
the electromagnetic driving mechanism (8) is arranged at the front end of the auxiliary rocker arm (4) and corresponds to the sliding pin (7), the electromagnetic driving mechanism (8) at least comprises a push rod (82) which can move up and down, and the action is controlled by the electromagnetic controller (9), and the push rod (82) is provided with a first position keeping a certain gap with the sliding pin (7) and a second position keeping contact with the sliding pin (7);
the electromagnetic driving mechanism (8) further comprises a push rod (81), a sleeve (83), a spring (84) and a spring seat (85);
the sleeve (83) is fixedly arranged at the front end of the auxiliary rocker arm (4), N groups of first sliding grooves (831) which are circumferentially and uniformly distributed and N groups of second sliding grooves (832) which are circumferentially and uniformly distributed are arranged on the inner wall of the sleeve, the first sliding grooves (831) and the second sliding grooves (832) are distributed at intervals, a positioning boss (833) is formed between the first sliding grooves (831) and the second sliding grooves (832), a first inclined surface structure (834) is formed at the bottom of the positioning boss (833), wherein the diameter of the first sliding grooves (831) is A, the second sliding grooves (832) are B, and A is more than B, and N is more than or equal to 3;
the push rod (81) is arranged in the sleeve (83), 2N first strip-shaped bosses (811) are uniformly arranged on the outer side of the push rod (81) in the circumferential direction, the first strip-shaped bosses (811) are respectively embedded into the first sliding groove (831) and the second sliding groove (832) and can move up and down along the first sliding groove (831) and the second sliding groove (832), and a sawtooth structure (812) which is uniformly distributed in the circumferential direction is formed on the lower end surface of the push rod (81);
the ejector rod (82) is arranged in the sleeve (83) and is positioned at the lower end of the ejector rod (81), N second strip-shaped bosses (821) are uniformly arranged on the outer side of the ejector rod (82) in the circumferential direction, the diameter of each second strip-shaped boss (821) is C, A is larger than C and larger than B, the second strip-shaped bosses (821) can be embedded into the first sliding groove (831), and a second inclined surface structure (822) is formed at the top of each second strip-shaped boss (821);
the spring seat (85) is fixed at the bottom of the sleeve (83), the spring (84) is sleeved on the ejector rod (82), and two ends of the spring are respectively abutted against the spring seat (85) and the ejector rod (82);
the electromagnetic controller (9) is arranged above the sleeve (83) and is contacted with the upper end face of the push rod (81), and the lower end of the push rod (82) passes through the spring seat (85) to correspond to the sliding pin (7).
2. The electromagnetically-controlled engine brake device according to claim 1, wherein: the first sliding groove (831) and the second sliding groove (832) are respectively provided with 4 groups, the first strip-shaped bosses (811) are provided with 8 groups, and the second strip-shaped bosses (821) are provided with 4 groups.
3. The electromagnetically-controlled engine brake device according to claim 1, wherein: the sleeve (83) is provided with a clamping groove (835) at a position close to the bottom, a clamping spring (86) is arranged in the clamping groove (835), and the spring seat (85) is arranged on the clamping spring (86).
4. The electromagnetically-controlled engine brake device according to claim 1, wherein: the front end of the auxiliary rocker arm (4) is provided with a threaded hole (41), an external thread structure is formed outside the sleeve (83), and the sleeve (83) is fixedly installed in the threaded hole (41) through threaded fit.
5. The electromagnetic control type engine brake apparatus according to claim 4, characterized in that: the top of the sleeve (83) protrudes from the top of the threaded hole (41), and is fixedly locked by a fastening nut (87).
6. The electromagnetically-controlled engine brake device according to claim 1, wherein: the second cam (22) includes a base circle (221) and one or more peaches (222).
7. The electromagnetically controlled engine brake device according to claim 6, wherein: the peach (222) comprises a brake peach and an EGR peach or BGR peach.
8. The electromagnetically-controlled engine brake device according to claim 1, wherein: the rear end of the auxiliary rocker arm (4) is provided with a bulge (42) to the side; the elastic member (6) adopts a plate spring, one end of the plate spring is fixedly pressed on the rocker arm shaft (1), and the other end of the plate spring is pressed on the bulge (42) so that the auxiliary rocker arm (4) is always contacted with the second cam (22).
9. The electromagnetically-controlled engine brake device according to claim 8, wherein: the protrusion (42) is cylindrical.
10. The electromagnetically-controlled engine brake device according to claim 1, wherein: an oil way (10) is arranged in the rocker arm shaft (1), a lubricating oil way (43) capable of communicating the oil way (10) is arranged in the auxiliary rocker arm (4), and the lubricating oil way (43) is led to the electromagnetic driving mechanism (8).
11. The electromagnetically-controlled engine brake device according to claim 1, wherein: the rear end of the exhaust rocker arm (3) is provided with a first roller (31), and the first roller (31) is contacted with the first cam (21).
12. The electromagnetically-controlled engine brake device according to claim 1, wherein: the rear end of the auxiliary rocker arm (4) is provided with a second roller (44), and the second roller (44) is in contact with the second cam (22).
13. The electromagnetically-controlled engine brake device according to claim 1, wherein: the front end of the exhaust rocker arm (3) is fixedly connected with an adjusting bolt (32), and the lower end of the adjusting bolt (32) is connected with the valve bridge (5) through an image angle (33).
14. The electromagnetic control type engine brake apparatus according to claim 13, wherein: the upper end of the adjusting bolt (32) protrudes from the top of the front end of the exhaust rocker arm (3) and is locked and fixed through a locking nut (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810749212.8A CN108661745B (en) | 2018-07-10 | 2018-07-10 | Electromagnetic control type engine braking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810749212.8A CN108661745B (en) | 2018-07-10 | 2018-07-10 | Electromagnetic control type engine braking device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108661745A CN108661745A (en) | 2018-10-16 |
| CN108661745B true CN108661745B (en) | 2023-11-21 |
Family
ID=63773887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810749212.8A Active CN108661745B (en) | 2018-07-10 | 2018-07-10 | Electromagnetic control type engine braking device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108661745B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109139172A (en) * | 2018-11-09 | 2019-01-04 | 广西玉柴机器股份有限公司 | The auxiliary brake mechanism of medium and heavy engine |
| CN109372608B (en) * | 2018-11-27 | 2024-03-01 | 浙江黎明智造股份有限公司 | Electromagnetic control type engine braking device |
| CN110566304B (en) * | 2018-11-30 | 2022-04-22 | 长城汽车股份有限公司 | Valve train and control strategy for an engine having a low pressure EGR system |
| CN109854325B (en) * | 2019-03-27 | 2024-01-05 | 大连理工大学 | Two-stroke auxiliary braking mechanism |
| WO2021031230A1 (en) * | 2019-08-16 | 2021-02-25 | 浙江黎明智造股份有限公司 | Electric engine braking device |
| US10876438B1 (en) | 2019-08-29 | 2020-12-29 | Zhejiang Liming Intelligent Manufacturing Co., Ltd. | Braking device for electric engine |
| CN110425015B (en) * | 2019-09-10 | 2024-02-27 | 浙江黎明智造股份有限公司 | Hydraulic control type engine braking device |
| CN113530633B (en) * | 2021-09-15 | 2021-12-28 | 宁波东方动力部件有限公司 | Internal combustion engine cylinder braking device with three rocker arm structure |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004084597A (en) * | 2002-08-28 | 2004-03-18 | Nippon Piston Ring Co Ltd | Exhaust valve control device |
| WO2010126479A1 (en) * | 2009-04-27 | 2010-11-04 | Jacobs Vehicle Systems, Inc. | Dedicated rocker arm engine brake |
| CN102817665A (en) * | 2012-09-10 | 2012-12-12 | 浙江亿日气动科技有限公司 | Air valve executive device having torsion springs and driven by auxiliary cam |
| CN102817667A (en) * | 2012-09-10 | 2012-12-12 | 浙江亿日气动科技有限公司 | Frame-type exhaust-valve executive device with auxiliary rocker arm driven by auxiliary cam |
| 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 |
| CN204113370U (en) * | 2014-09-24 | 2015-01-21 | 中国第一汽车股份有限公司 | A kind of independent cam engine brake device |
| CN208380655U (en) * | 2018-07-10 | 2019-01-15 | 浙江黎明发动机零部件有限公司 | A kind of electromagnetic control type engine braking apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7392772B2 (en) * | 2004-05-06 | 2008-07-01 | Jacobs Vehicle Systems, Inc. | Primary and offset actuator rocker arms for engine valve actuation |
| CN102588030B (en) * | 2011-01-05 | 2016-08-10 | 上海尤顺汽车部件有限公司 | The auxiliary valve driving mechanism of electromotor |
-
2018
- 2018-07-10 CN CN201810749212.8A patent/CN108661745B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004084597A (en) * | 2002-08-28 | 2004-03-18 | Nippon Piston Ring Co Ltd | Exhaust valve control device |
| WO2010126479A1 (en) * | 2009-04-27 | 2010-11-04 | Jacobs Vehicle Systems, Inc. | Dedicated rocker arm engine brake |
| CN102817665A (en) * | 2012-09-10 | 2012-12-12 | 浙江亿日气动科技有限公司 | Air valve executive device having torsion springs and driven by auxiliary cam |
| CN102817667A (en) * | 2012-09-10 | 2012-12-12 | 浙江亿日气动科技有限公司 | Frame-type exhaust-valve executive device with auxiliary rocker arm driven by auxiliary cam |
| 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 |
| CN204113370U (en) * | 2014-09-24 | 2015-01-21 | 中国第一汽车股份有限公司 | A kind of independent cam engine brake device |
| CN208380655U (en) * | 2018-07-10 | 2019-01-15 | 浙江黎明发动机零部件有限公司 | A kind of electromagnetic control type engine braking apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108661745A (en) | 2018-10-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108661745B (en) | Electromagnetic control type engine braking device | |
| CN109372608B (en) | Electromagnetic control type engine braking device | |
| US7984705B2 (en) | Engine braking apparatus with two-level pressure control valves | |
| US4473047A (en) | Compression release engine brake | |
| US20100170472A1 (en) | Integrated engine brake with mechanical linkage | |
| CN104975898A (en) | Integrated rocker arm used for achieving engine braking | |
| CN110566308B (en) | Reset slide valve type rocker arm mechanism for engine braking and braking method thereof | |
| CN105736086A (en) | Combustion braking and pressure reduction braking combined engine braking method and pressure reduction device | |
| JPH04224216A (en) | Gas compression release type engine gear reducer and method | |
| CN104481628A (en) | Mechanical connection type engine integration rocker arm brake device with valve lift reset function | |
| CN209908586U (en) | Engine valve bridge structure with variable valve lift | |
| CN109779716B (en) | Compact movable driving fulcrum | |
| CN208380655U (en) | A kind of electromagnetic control type engine braking apparatus | |
| CN112282888A (en) | Engine braking device with continuously adjustable braking lift | |
| CN110541762B (en) | Engine brake control device with multiple driving sources | |
| CN204851355U (en) | A integrated form rocking arm for producing engine brake | |
| CN110425015B (en) | Hydraulic control type engine braking device | |
| CN1312388C (en) | Arm swinging for combuston engine of changable valve stopping and output volume | |
| CN110374713B (en) | Engine braking device | |
| CN210622882U (en) | Electric control type engine braking device | |
| CN210396841U (en) | Hydraulic control type engine braking device | |
| CN209163890U (en) | A kind of electromagnetic control type engine braking apparatus | |
| CN110529216B (en) | Electric control type engine braking device | |
| CN213574275U (en) | Electrically controlled engine braking device with continuously adjustable braking lift | |
| CN110344909B (en) | Electric engine braking device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 316000 Honglu Avenue, Xingang Park, Zhoushan High-tech Industrial Park, Zhejiang Province Applicant after: ZHEJIANG LIMING ZHIZAO Co.,Ltd. Address before: 316000 No. 456 Hongsheng Avenue, Zhoushan City, Zhejiang Province Applicant before: ZHEJIANG LIMING ENGINE PARTS CO.,LTD. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |