CN103334807B - With the genemotor braking executive device of live axle - Google Patents
With the genemotor braking executive device of live axle Download PDFInfo
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- CN103334807B CN103334807B CN201310214437.0A CN201310214437A CN103334807B CN 103334807 B CN103334807 B CN 103334807B CN 201310214437 A CN201310214437 A CN 201310214437A CN 103334807 B CN103334807 B CN 103334807B
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Abstract
The present invention relates to a kind of genemotor braking executive device of the band live axle be applied in diesel engine, be applicable to engine braking function; Comprise exhaust rocker arm assembly, brake rocker arm, pitman arm shaft, brake rocker arm lining, adjustment bolt, camshaft, pitman arm shaft briquetting, bearing, control mechanism, air valve bridge, exhaust valve, driving mechanism, position transducer, torsion spring; Camshaft increases a brake cam, is used for driving brake rocker arm, when needing engine braking apparatus to work, the optimum position of control mechanism adjusting rock arm axle; Control mechanism can make pitman arm shaft rotate continuously, change the axial location of brake rocker arm lining, therefore adjusting distance between bolt and sliding pin can consecutive variations, thus adjustment braking valve lift in real time, make motor in full speed range, obtain optimum braking ability.The present invention makes motor in full speed range, obtain optimum braking ability, makes the longer service life of motor, efficiency higher.
Description
Technical field
The present invention relates to a kind of braking executive device is applied in diesel engine, is specifically related to a kind of genemotor braking executive device system realizing the band live axle of continuously adjustabe valve actuation lift.
Background technique
Diesel engine is mainly as the power source of commercial car.When diesel engine makes positive work, in camshaft rotating 360 degrees (crankshaft rotating 720 °) process, motor completes air inlet, compression, acting and exhaust four work cycle.At the end of compression stroke, fuel oil sprays in cylinder and burns, and externally does work in expansion stroke subsequently.On diesel engine camshaft, generally include intake cam and exhaust cam, intake cam opens intake valve in the intake stroke makes air enter in cylinder, and the waste gas of burning is discharged cylinder for opening exhaust valve by exhaust cam in exhaust stroke.
Along with the development of technology, diesel engine, except meeting as except the performance index needed for car load power source, also needs the requirement meeting car load auxiliary braking system further, and the such as application of engine braking technology promotes car load auxiliary braking performance effectively.
The resistance produced when engine braking technology refers to and utilizes motor to run carrys out effective regulation speed, engine braking is by the fall holder of automobile to motor, utilize the mechanical loss of motor, pumping loss and compression work etc. to produce braking function, thus increase automobile brake power.Engine braking technology is divided into Compression Engine braking, deflation type engine braking and part deflation type engine braking three kinds.Compression Engine braking opens exhaust valve or auxiliary valve near; Deflation type engine braking opens exhaust valve at whole cycle of engine; Part deflation type engine braking opens exhaust valve at most of stroke of cycle of engine.The application of engine braking technology reduces the frequency of utilization of Service Brake effectively, car load is in lower long slope, rugged hill path etc. during precipitous road surface, use engine braking, can avoid because using break for a long time, the temperature of brake bush is caused to raise, braking force is declined, even ineffective.
The actuating device of valve mechanism can provide one or multiple auxiliary valve lifts, for realizing engine braking function.Current multiple patent of invention relates to the application of technique, major technique is outside the main lift of cam, comprise one or several auxiliary lifts extra, according to the needs of engine operation, valve mechanism actuating device makes auxiliary lifts work (realizing engine braking function) or make it not work.
Traditional engine braking apparatus mainly comprises a support, support is arranged one or several internal oil passages, in aggressive valve and the rack-mount active valve opening of servo valve and driven valve opening, aggressive valve can be slided in active valve opening, servo valve can slide in driven valve opening, initiatively valve opening is communicated with by the oil circuit on support with driven valve opening, and whether electromagnetic valve is to the oil circuit fuel feeding in support.When engine valve actuating device works, machine oil enters the hydraulic circuit on support, and due to the incompressibility of machine oil, servo valve can not slide in driven valve opening, on camshaft auxiliary lifts driving under open valve.When cancelling auxiliary valve lifts, machine oil can flow out by the oil circuit on support.
Patent 201080019296.1 for Jacobs Vehicle Systems Inc. apply for for engine braking and be vented the sky opened in advance and move changeable air valve braking system, this disclosure of the invention is a kind of for braking I. C. engine exhaust door to provide compression release braking at the motor run duration of engine braking modes and to provide prerelease door to open the method and system of braking at the motor run duration of positive pattern, and described method and system also provides to be braked and prerelease door opens the EGR and/or brake gas recirculation braking and be combined with compressing to discharge; The method of the operation engine brake that patent 200780025923.0 is applied for for Jacobs Vehicle Systems Inc., this disclosure of the invention for the engine valve of brake setting between engine cylinder and gas exhaust manifold to be combined with exhaust throttle and brake gas recirculation the method and apparatus providing the engine braking compressing-discharge; Patent WO2010/126479A1 is the special engine brake rocker arm (DedicatedRockerArmEngineBrake) of Jacobs Vehicle Systems Inc.'s application is realize Compression Engine braking by rocking arm integration mode.
Engine braking performance largely depends on the unlatching lift of braking valve and opens timing.Braking valve lift and to open timing be optimum when certain engine speed to braking ability, can not meet braking ability optimum in the full speed range of motor.The engine braking apparatus of prior art does not have the continuously adjustable function of braking valve lift, simultaneously, available engine braking technology can not change valve opening timing according to delivery temperature, when causing excessive discharge temperature during engine braking operation, the service life reduction of engine component (particularly oil nozzle).
Summary of the invention
For above-mentioned defect, the object of this invention is to provide a kind of simple, efficient valve actuating device, described device comprises a closed loop control braking system, braking valve lift and braking timing can be adjusted in real time, improve the braking ability of the full rotating speed of motor, braking timing can be changed according to the feedback of exhaust gas temperature sensor simultaneously and avoid excessive discharge temperature, make up the deficiency of above-mentioned valve actuating device, to solve the problem of prior art.
For achieving the above object, present invention employs following technological scheme:
A kind of genemotor braking executive device with live axle, comprise exhaust rocker arm assembly, brake rocker arm, pitman arm shaft, brake rocker arm lining, adjustment bolt, camshaft, control mechanism, air valve bridge, exhaust valve, driving mechanism, position transducer, torsion spring;
Described exhaust rocker arm assembly and described brake rocker arm are arranged adjacent each other on described pitman arm shaft, open exhaust valve at engine compresses near top dead center and realize engine braking, the camshaft of motor increases a brake cam, and described brake cam drives described brake rocker arm; Described brake rocker arm lining rotates, and compensate reserved valve clearance, the little lift of brake cam works, and under the driving of described brake rocker arm, exhaust valve is opened as requested, plays the object of engine braking.
According to the genemotor braking executive device of the band live axle described in the embodiment of the present invention, described brake rocker arm, when braking device does not work, does not affect the motion of exhaust valve, when braking device works, can realize engine braking.
According to the genemotor braking executive device of the band live axle described in the embodiment of the present invention, the adjustment bolt on described brake rocker arm and the gap between the sliding pin on air valve bridge can overcome the little lift of brake cam.
According to the genemotor braking executive device of the band live axle described in the embodiment of the present invention, described brake rocker arm lining can rotate around described pitman arm shaft, compensates the gap between the adjustment bolt on described brake rocker arm and the sliding pin on air valve bridge.
According to the genemotor braking executive device of the band live axle described in the embodiment of the present invention, described brake rocker arm lining eccentric position in rotary course changes, and makes described brake rocker arm change in location.
According to the genemotor braking executive device of the band live axle described in the embodiment of the present invention, described torsion spring makes described brake rocker arm contact with camshaft all the time in engine working process.
According to the genemotor braking executive device of the band live axle described in the embodiment of the present invention, the end of described brake rocker arm lining is connected with driving mechanism.
According to the genemotor braking executive device of the band live axle described in the embodiment of the present invention, described driving mechanism comprises live axle, ball pin, driveshaft and round key; Described live axle is fixed on cylinder cap with described pitman arm shaft briquetting and described bearing, and described live axle can rotate freely in described bearing, and described live axle is provided with drive shaft hole; Described driveshaft end is provided with driving rod aperture, and front end is provided with spherical nest, and described brake rocker arm lining end is provided with rocker arm bush hole; Described driveshaft and described brake rocker arm lining link together through described rocker arm bush hole and described driving rod aperture by described round key; Described ball pin end is arranged in the described drive shaft hole of described live axle, and rotate with the rotation of described live axle, described ball pin front end is arranged in the spherical nest of described driveshaft front end; The swing arm of described ball pin, driveshaft and brake rocker arm lining forms three-link mechanism, and described live axle rotates under the driving of described control mechanism, drives described ball pin and the motion of described driveshaft, thus drives described brake rocker arm lining to rotate.
According to the genemotor braking executive device of the band live axle described in the embodiment of the present invention, described driving mechanism comprises live axle, roller and roller shaft; Described live axle is fixed on cylinder cap with pitman arm shaft briquetting and bearing, and described pitman arm shaft is fixed in described pitman arm shaft briquetting front end, and rear end supports described live axle, and described live axle can rotate freely on pitman arm shaft briquetting; Described roller shaft is arranged on the end of described brake rocker arm lining, and described roller is arranged on described roller shaft, and on described live axle, the position of corresponding described roller arranges projection; When described live axle rotates under the driving of control mechanism, described projection drives described roller to drive described brake rocker arm lining to rotate.
According to the genemotor braking executive device of the band live axle described in the embodiment of the present invention, described driving mechanism comprises live axle and gear; Live axle is fixed on cylinder cap with pitman arm shaft briquetting and bearing, and described pitman arm shaft is fixed in described pitman arm shaft briquetting front end, and rear end supports described live axle, and described live axle can rotate freely on pitman arm shaft briquetting; Described gear is installed on the driving shaft, and the tip designs of described brake rocker arm lining becomes the described gear on gear structure and described live axle to be meshed; When described live axle rotates under the driving of described control mechanism, the gear structure of brake rocker arm lining end described in described gear drive, drives described brake rocker arm lining to rotate.
Owing to have employed above technical characteristics, the present invention is made to have following advantage and good effect compared to prior art:
The first, electric engine brake device structure of the present invention is simple, good rigidity, and cost is low;
The second, the position relationship of component in the continuable change braking system of apparatus of the present invention, makes braking valve opening time and lift continuously change, improves the braking ability in full speed range;
Three, the present invention is when excessive discharge temperature, open exhaust valve in advance by valve actuating device, gas pressure during reduction compression stroke, thus reduce cylinder temperature, avoid engine overheat to reduce part life, improve the reliability of engine braking operation process.
Certainly, implement any one specific embodiment of content of the present invention, above whole technique effect might not be had simultaneously.
Accompanying drawing explanation
Fig. 1 is the embodiment of the present invention 1 electric engine brake device work frame chart;
Fig. 2 is the embodiment of the present invention 1 electric engine brake device workflow diagram;
Fig. 3 is the side view of embodiment 2 Rocker arm assembly;
Fig. 4 is the plan view of embodiment 2 Rocker arm assembly;
Fig. 5 is the decomposition view of embodiment 2 braking system;
Fig. 6 is embodiment 2 pitman arm shaft and brake rocker arm lining coupled condition sectional view;
Fig. 7 is braking eccentric bush axial location variation diagram;
Fig. 8 is the structural drawing of embodiment 2 control mechanism scheme 1;
Fig. 9 is the structural drawing of embodiment 2 control mechanism scheme 2;
Figure 10 is the structural drawing of embodiment 2 control mechanism scheme 3;
Figure 11 is the decomposition view of embodiment 2 control mechanism scheme 3;
Figure 12 is the structural drawing of embodiment 2 control mechanism scheme 4;
Figure 13 is the decomposition view of embodiment 2 control mechanism scheme 4;
Figure 14 is the side view of embodiment 3 Rocker arm assembly;
Figure 15 is the plan view of embodiment 3 Rocker arm assembly;
Figure 16 is the decomposition view of embodiment 3 braking system;
Figure 17 is the structural drawing of embodiment 3 driving mechanism scheme 1;
Figure 18 is the side view of embodiment 3 driving mechanism scheme 1;
Figure 19 is the decomposition view of embodiment 3 driving mechanism scheme 1;
Figure 20 is the structural drawing of embodiment 3 driving mechanism scheme 2;
Figure 21 is the structural drawing of embodiment 3 driving mechanism scheme 3.
Embodiment
Under the technological scheme that summary of the invention illustrates, for ease of understanding, below in conjunction with accompanying drawing, several preferred embodiment of the present invention is described in detail, but the present invention is not restricted to these embodiments.The present invention contain any make on marrow of the present invention and scope substitute, amendment, equivalent method and scheme.To have the present invention to make the public and understand thoroughly, in the following preferred embodiment of the present invention, describe concrete details in detail, and do not have the description of these details also can understand the present invention completely for a person skilled in the art.In addition, in order to avoid causing unnecessary obscuring to essence of the present invention, well-known method, process, flow process, element etc. are not described in detail.
Embodiment 1
Please refer to shown in Fig. 1 and Fig. 2, electric engine brake device of the present invention comprises braking system 1 for engine braking, signal wheel 2, position transducer 3, control unit of engine 4, engine braking ECU (Electrical Control Unit) 5, drive unit 11, exhaust gas temperature sensor 8, speed probe 9 and Control Shaft 10, and drive unit 11 comprises control mechanism 6 and driving mechanism 7.
Control mechanism 6 is arranged in driving mechanism 7 front end, and control mechanism 6 can drive driving mechanism 7 to move.Control mechanism 6 is fixed on driving mechanism 7 front end by bolt or other devices.When driving mechanism 7 is when the move under influence of control mechanism 6, the position of Control Shaft 10 can be continuously changed, thus change the position relationship of component in braking system 1, thus realize the continuous setup to braking valve lift and braking timing.Improve the braking ability in the full speed range of motor.
Control mechanism 6 comprises motor or other power plant power source as driving mechanism 7, and the power that control mechanism 6 exports passes to driving mechanism 7 through reducing gear.Speed probe 9 gathers engine rotational speed signal and passes to control unit of engine 4, and engine rotational speed signal passes to engine braking ECU (Electrical Control Unit) 5 through control unit of engine 4.Exhaust gas temperature sensor 8 gathers exhaust temperature signal, and the position signal that position transducer 3 gathers Control Shaft 10 angle passes to engine braking ECU (Electrical Control Unit) 5.On engine pedestal, demarcate the optimal brake valve lift of different rotating speeds and the plotted curve of braking timing, the braking valve lift of the best and braking timing plotted curve are cured in engine braking ECU (Electrical Control Unit) 5.The braking valve lift that the different rotary angle of Control Shaft 10 corresponding is fixing, this corresponding relation is also solidificated in engine braking control unit 5.Engine braking ECU (Electrical Control Unit) 5 utilizes the tach signal gathered, according to braking lifting curve figure, determine the optimum value of braking lift, braking valve lift corresponding to the Control Shaft angle signal export this value and position transducer 3 carries out contrast computing, thus determine the required adjustment angle of Control Shaft 10 further, be converted into an electrical signal transfer to control mechanism 6, control mechanism 6 drives driving mechanism 7 to change the position of Control Shaft 10, thus change the position of component in braking system 1, thus realize the continuous setup to braking valve lift and timing.
Braking system 1, signal wheel 2, position transducer 3, control unit of engine 4, engine braking ECU (Electrical Control Unit) 5, control mechanism 6, driving mechanism 7, exhaust gas temperature sensor 8, speed probe 9, Control Shaft 10 form a modular system together, can be used in different motors.Working control axle 10 phase place is taken turns 2 by signal and is passed to position transducer 3 record, and the position signal of reality is fed back to engine braking ECU (Electrical Control Unit) 5, theoretical Control Shaft 10 position that real-time and engine braking ECU (Electrical Control Unit) 5 introversion line chart is determined contrasts, and forms closed loop control braking system.
Embodiment 2
As Fig. 3, Fig. 4, shown in Fig. 5 and Fig. 6, genemotor braking valve actuating device of the present invention comprises exhaust rocker arm assembly 2001, brake rocker arm 2002, pitman arm shaft 2003, brake rocker arm roller 2004, brake rocker arm lining 2005, adjustment bolt 2006, camshaft 2007, pitman arm shaft briquetting 2008, round key 2009, brake rocker arm roller shaft 2010, control mechanism 2011(as shown in Figure 8), air valve bridge 2012, exhaust valve 2013, second row valve 2014, rocking arm outer shaft 2015, position transducer 2016, signal wheel 2161, torsion spring 2017, adjusting nut 2018.
It is a closed loop control braking system 2100 adopting brake cam to drive shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6.Exhaust valve 2013, second row valve 2014 are mushroom valves, for controlling the flowing of gas between motor internal furnace and intake and exhaust manifold.Closed loop control braking system 2100 can be used for realizing engine braking and needing valve to have the situation of auxiliary lifts.Closed loop control braking system 2100 comprises a pitman arm shaft 2003 and rocking arm outer shaft 2015, three cylinder or six cylinders and shares a pitman arm shaft 2003 and a rocking arm outer shaft 2015.Exhaust rocker arm assembly 2001 and brake rocker arm 2002 are arranged adjacent each other on rocking arm outer shaft 2015, exhaust rocker arm assembly 2001 and brake rocker arm 2002 rotate around rocking arm outer shaft 2015 under camshaft 2007 drives, and two bolts hole of rocking arm outer shaft 2015 on pitman arm shaft briquetting 2008 are fixed in cylinder cap or other fixing devices.
Exhaust rocker arm assembly 2001 drives exhaust valve 2013 and second row valve 2014 to realize exhaust stroke by air valve bridge 2012 simultaneously.Camshaft 2007 rotates, and cam 2702 drives exhaust rocker arm assembly 2001, and exhaust rocker arm assembly 2001 is rotated around rocking arm outer shaft 2015.Brake rocker arm 2002 optionally drives the sliding pin 2121 on air valve bridge 2012 to open exhaust valve 2013 and realizes engine braking function.Shoulder in the middle of sliding pin 2121 coordinates with the shoulder in sliding pin hole on air valve bridge 2012.
Brake rocker arm roller shaft 2010 is arranged on the end of brake rocker arm 2002, brake rocker arm roller 2004 is arranged on brake rocker arm roller shaft 2010 and brake cam 2701 contacts, and brake rocker arm 2002 rotates around rocking arm outer shaft 2015 under the driving of brake cam 2701.Brake cam 2701 comprises protruding 2711 and basic circle 2721 two-part.Brake cam 2701 can make motor realize compression type, deflation type and part deflation type engine braking.Compression Engine braking opens exhaust valve or braking valve near; Deflation type engine braking opens exhaust valve at whole cycle of engine; Part deflation type engine braking opens exhaust valve at most of stroke of cycle of engine.
Brake cam 2701 can comprise one or more projection to replace protruding 2711, and such as a BGR projection drives brake rocker arm 2002 to realize auxiliary valve motion, and optional BGR projection can provide a BGR lift when engine braking.
In engine working process, brake rocker arm 2002 remains and to contact with brake cam 2701, and as shown in Figure 4, torsion spring 2017 one end is fixed on brake rocker arm 2002, the other end is fixed on rocking arm outer shaft 2015, and brake rocker arm 2002 is pressed to brake cam 2701 by torsion spring 2017.In engine working process, torsion spring 2017 has enough spring forces that brake rocker arm 2002 is contacted with brake cam 2701 always.
Pitman arm shaft 2003 comprises one or more oil circuit and machine oil is supplied to rocking arm on pitman arm shaft 2003.Specifically, pitman arm shaft 2003 comprises a lubricating oil path, lubricating oil path can provide lubricant oil to one or more rocking arm in engine working process.
As shown in Figure 5 and Figure 6, brake rocker arm 2002 comprises bush hole 2201, and bush hole 2201 extends laterally across the centre of brake rocker arm 2002, installs brake rocker arm lining 2005 in bush hole 2201 inside, and rocking arm outer shaft 2015 is installed in brake rocker arm lining 2005 inside.Brake rocker arm lining 2005 there is the rocker arm bush hole 2501 arranged along pitman arm shaft Vertical direction; the corresponding position of pitman arm shaft 2003 arranges rocker shaft hole 2301; rocking arm outer shaft 2015 is arranged corresponding rocking arm axial trough 2151 outward; brake rocker arm lining 2005 is by round key 2009, and through rocker arm bush hole 2501, axial trough 2151, rocker shaft hole 2301 are fixed on pitman arm shaft 2003 rocking arm outward.The outer axial trough 2151 of rocking arm on rocking arm outer shaft 2015 is that long strip groove can make round key 2009 slide within it.Adjustment bolt 2006 is locked and is paid in the through hole of brake rocker arm 2002, determines the exposed length of adjustment bolt 2006 with adjusting nut 2018 according to setting.
Control mechanism 2011 is arranged in pitman arm shaft front end, and control mechanism 2011 can drive pitman arm shaft 2003 to rotate.Control mechanism 2011 is fixed on pitman arm shaft front end by bolt or other devices, brake rocker arm lining 2005 is eccentric structure, when pitman arm shaft 2003 rotates under the effect of control mechanism 2011, brake rocker arm lining 2005 is driven to rotate, thus change eccentric position, change the distance between sliding pin 2121 on adjustment bolt 2006 and air valve bridge 2012.Control mechanism 2011 can make pitman arm shaft 2003 rotate continuously, and therefore adjusting distance on bolt 2006 and air valve bridge 2012 between sliding pin 2121 can consecutive variations, thus makes braking lift and braking timing consecutive variations.Different braking lifts is provided when different rotating speeds, improves the braking ability in full speed range.
Control mechanism 2011 can be realized by following four kinds of structures:
Scheme 1: as shown in Figure 8, control mechanism 2011 comprises worm screw 2019, worm gear 2020, lock bolt 2021 and motor 2022.Worm gear 2020 is fixed on the front end of pitman arm shaft 2003 by lock bolt 2021, one end of worm screw 2019 is connected with worm gear 2020, and the other end of worm screw 2019 is connected with motor 2022, under motor 2022 acts on, worm screw 2019 drives worm gear 2020 to rotate, thus drives pitman arm shaft 2003 to rotate.
Scheme 2: as shown in Figure 9, control mechanism 2011 comprises motor 2023, drive bevel gear 2024, bevel gear 2025, drive link 2026, sleeve 2027, connecting pin 2028, controlling rod 2029 and locking nut 2030.Controlling rod 2029 is fixed on the front end of pitman arm shaft 2003 by locking nut 2030, sleeve 2027 is fixed on the lower end of controlling rod 2029 by connecting pin 2028, the outside thread of drive link 2026 and the internal thread engagement of sleeve 2027, make sleeve 2027 can move along the direction perpendicular to pitman arm shaft 2003.Drive bevel gear 2024 is fixed on drive link 2026 front end, and bevel gear 2025 is fixed on motor 2023 front end, and drive bevel gear 2024 and bevel gear 2025 are intermeshed.Use bevel gear drive can change the sense of rotation of direct current generator 2023, make direct current generator 2023 can be parallel to pitman arm shaft 2003 and place.When motor 2023 obtain control signal rotate time, after it rotates through drive bevel gear 2024, bevel gear 2025 changes direction, through drive link 2026, sleeve 2027, controlling rod 2029 transmission, drive pitman arm shaft 2003 to rotate.
Scheme 3: as shown in Figure 10 and Figure 11, control mechanism 2011 comprises base 2031, rotor 2032, stator 2033, top cover 2034, lock pair bolt 2035, stud 2036 and nut 2037.Base 2031 is fixed in cylinder cap or other fixing devices, stator 2033 and top cover 2034 are fixed on base 2031 by stud 2036 and nut 2037, rotor 2032 is arranged between base 2031 and top cover 2034, and rotor 2032 is paid bolt 2035 with pitman arm shaft 2003 with lock and is connected; Stator 2033 there are four baffle plates, rotor 2032 has four baffle plates, form oil closed cavity between the baffle plate of stator 2033 and rotor 2032, the oil circuit on pitman arm shaft 2003 or other devices is to fuel feeding in oil pocket, rotor 2032 is rotated around stator 2033, thus drives pitman arm shaft 2003 to rotate.
Scheme 4: as shown in Figure 12 and Figure 13, control mechanism 2011 comprises motor 2038, drive link 2039, straight pin 2040, planet carrier 2041, plural fixing pin 2042, plural planet wheel 2043, sun gear 2044, external toothing 2045 and bolt 2046.External toothing 2045 is fixed in cylinder cap or other fixing devices, one end and the motor 2038 of drive link 2039 are fixed together, the other end is fixed on planet carrier 2041 by straight pin 2040, and planet wheel 2043 is fixed on planet carrier 2041 by fixing pin 2042, is placed in described external toothing 2045; The application for four planet wheels, but can not be used for limiting the application.Sun gear 2044 is fixed on pitman arm shaft 2003 by bolt 2046, and sun gear 2044 and planet wheel 2043 engage.When motor 2038 obtains control signal rotation, drive drive link 2039 to rotate, drive the planet wheel 2043 on planet carrier 2041 to rotate, thus drive sun gear 2044 to rotate, drive pitman arm shaft 2003 to rotate.The number of planet wheel 2043 is different with the number of teeth will form different reducing gears.
Direct current generator as drive pitman arm shaft 2003 rotate power source, motor be rotated through four kinds of reducing gears as above or other forms of reducing gear passes to pitman arm shaft 2003.
To introduce the working procedure of the valve actuation closed loop control braking system 2100 adopting brake cam to drive in detail below, Crankshaft motion drives camshaft 2007 to rotate.Cam 2702 on camshaft 2007 drives exhaust rocker arm assembly 2001 to rotate around rocking arm outer shaft 2015, and open and close exhaust valve 2013, second row valve 2014 realize exhaust stroke; Brake cam 2701 on camshaft 2007 drives brake rocker arm 2002 to rotate around rocking arm outer shaft 2015, realizes engine braking function.
As shown in Figure 7, during engine work, the axial location of brake rocker arm lining 2005 is A, and adjust on bolt 2006 and air valve bridge 2012 and there is certain gap between sliding pin 2121, this gap enough overcomes the braking lift produced when brake cam 2701 drives brake rocker arm 2002 to rotate.Camshaft 2007 rotates, brake cam 2701 contacts with brake rocker arm roller 2004, and drive brake rocker arm 2002 to rotate around pitman arm shaft 2003, the gap between adjustment bolt 2006 and sliding pin 2121 overcomes braking lift, do not drive sliding pin 2121, inoperative to exhaust valve 2013.
During engine braking apparatus work, under the effect of control mechanism 2011; pitman arm shaft 2003 rotates thus drives brake rocker arm lining 2005 to rotate; axial location becomes A '; brake rocker arm 2002 moves downward along with the rotation of brake rocker arm lining 2005; drive adjustment bolt 2006 to move down, thus change the distance between the sliding pin 2121 on adjustment bolt 2006 and air valve bridge 2012, the little lift on brake cam 2701 works.Camshaft 2007 rotates, and brake cam 2701 contacts with brake rocker arm roller 2004, drives brake rocker arm 2002 to rotate around rocking arm outer shaft 2015, drives the sliding pin 2121 on air valve bridge 2012 to open exhaust valve 2013 and realizes engine braking.
When engine valve actuating device does not work, control mechanism 2011 drives pitman arm shaft 2003 opposite spin, thus makes brake rocker arm lining 2005 return to initial position, and the little lift of brake cam 2701 is inoperative, engine work.
Embodiment 3
As Figure 14, shown in Figure 15 and Figure 16, braking executive device of the present invention comprises exhaust rocker arm assembly 3001, brake rocker arm 3002, pitman arm shaft 3003, brake rocker arm roller 3004, brake rocker arm lining 3005, adjustment bolt 3006, camshaft 3007, pitman arm shaft briquetting 3008(as shown in figure 17), bearing 3009(as shown in figure 17), brake rocker arm roller shaft 3010, control mechanism (not shown), air valve bridge 3012, exhaust valve 3013, second row valve 3014, driving mechanism 3015(as shown in figure 17), position transducer 3016, signal wheel 3161, torsion spring 3017, adjusting nut 3018.
It is a closed loop control braking system 3100 adopting brake cam to drive as shown in Figure 14, Figure 15 and Figure 16.Exhaust valve 3013 and second row valve 3014 are mushroom valves, for controlling the flowing of gas between motor internal furnace and intake and exhaust manifold.Closed loop control braking system 3100 can be used for realizing the continuously adjustabe of braking valve lift and need valve to have the situation of auxiliary lifts; Closed loop control braking system 3100 comprises a pitman arm shaft 3003, three cylinder or six cylinders share a pitman arm shaft 3003; Exhaust rocker arm assembly 3001 and brake rocker arm 3002 are arranged adjacent each other on pitman arm shaft 3003, exhaust rocker arm assembly 3001 and brake rocker arm 3002 rotate around pitman arm shaft 3003 under the effect of camshaft 3007 or other drive units, and pitman arm shaft 3003 is through pitman arm shaft briquetting 3008(as shown in figure 17) on bolt hole be fixed in cylinder cap or other fixing devices.
Exhaust rocker arm assembly 3001 drives exhaust valve 3013 and second row valve 3014 to realize exhaust stroke by air valve bridge 3012 simultaneously.Camshaft 3007 rotates, and cam 3702 drives exhaust rocker arm assembly 3001, and exhaust rocker arm assembly 3001 is rotated around pitman arm shaft 3003.Brake rocker arm 3002 optionally drives the sliding pin 3121 on air valve bridge 3012 to open exhaust valve 3013 and realizes engine braking function.Shoulder in the middle of sliding pin 3121 coordinates with the shoulder in sliding pin hole on air valve bridge 3012.
Brake rocker arm roller shaft 3010 is arranged on the end of brake rocker arm 3002, and brake rocker arm roller 3004 is arranged on brake rocker arm roller shaft 3010 and brake cam 3701 contacts, and brake rocker arm 3002 rotates around pitman arm shaft 3003 under the driving of brake cam 3701.Brake cam 3701 comprises protruding 3711 and basic circle 3721 two-part.Brake cam 3701 can make motor realize compression type, deflation type and part deflation type engine braking.Compression Engine braking opens exhaust valve or braking valve near; Deflation type engine braking opens exhaust valve at whole cycle of engine; Part deflation type engine braking opens exhaust valve at most of stroke of cycle of engine.
Brake cam 3701 can comprise one or more projection to replace protruding 3711, and such as a BGR projection drives brake rocker arm 3002 to realize braking valve motion, and optional BGR projection can provide a BGR lift when engine braking.
In engine working process, brake rocker arm 3002 remains and to contact with brake cam 3701, and as shown in figure 15, torsion spring 3017 one end is fixed on brake rocker arm 3002, the other end is fixed on pitman arm shaft 3003, and brake rocker arm 3002 is pressed to brake cam 3701 by torsion spring 3017.In engine operation engineering, torsion spring 3017 has enough spring forces that brake rocker arm 3002 is contacted with brake cam 3701 always.
As shown in Figure 14 and Figure 15, pitman arm shaft 3003 comprises one or more oil circuit and machine oil is supplied to rocking arm on pitman arm shaft 3003.Specifically, pitman arm shaft 3003 comprises a lubricating oil path, lubricating oil path can provide lubricant oil to one or more rocking arm in engine working process.
Brake rocker arm 3002 comprises bush hole 3201, and this hole extends laterally across the centre of rocking arm, installs brake rocker arm lining 3005 in bush hole 3201 inside, and pitman arm shaft 3003 is installed in brake rocker arm lining 3005 inside.The end of brake rocker arm lining 3005 is connected with driving mechanism 3015.
Control mechanism is fixed on driving mechanism 3015 front end by bolt or other devices, brake rocker arm lining 3005 is eccentric structure, when the move under influence of driving mechanism 3015 at control mechanism, brake rocker arm lining 3005 is driven to rotate, thus change eccentric position, change the distance between sliding pin 3121 on adjustment bolt 3006 and air valve bridge 3012.Control mechanism can make driving mechanism 3015 rotate continuously, and therefore adjusting distance on bolt 3006 and air valve bridge 3012 between sliding pin 3121 can consecutive variations, thus makes braking lift and braking timing consecutive variations.Adjustment bolt 3006 is locked and is paid in the through hole of brake rocker arm 3002, determines the exposed length of adjustment bolt 3006 with adjusting nut 3018 according to setting.
Driving mechanism 3015 can be realized by following three kinds of structures:
Scheme 1: as shown in Figure 17, Figure 18 and Figure 19, driving mechanism 3015 is made up of live axle 3051, ball pin 3052, driveshaft 3053, round key 3054.Live axle 3051 is fixed on cylinder cap by pitman arm shaft briquetting 3008, bearing 3009, and pitman arm shaft 3003 ensures certain position relationship, and live axle 3051 can rotate freely in bearing 3009, and live axle 3051 is provided with drive shaft hole 3511.Driveshaft 3053 end is provided with and drives rod aperture 3531, and front end is provided with spherical nest 3532, and brake rocker arm lining 3005 end is provided with rocker arm bush hole 3501.Round key 3054 through rocker arm bush hole 3501, drive rod aperture 3531 driveshaft 3053 and brake rocker arm lining 3005 end are linked together.Ball pin 3052 end is arranged in the drive shaft hole 3511 of live axle 3051, and rotate with the rotation of live axle 3051, ball pin 3052 front end is arranged in the spherical nest 3532 of driveshaft 3053 front end.The swing arm of ball pin 3052, driveshaft 3053 and brake rocker arm lining 3005 forms three-link mechanism, and when live axle 3051 rotates under the driving of control mechanism, drive ball pin 3052, driveshaft 3053 move, thus drive brake rocker arm lining 3005 to rotate.
Scheme 2: as shown in figure 20, driving mechanism 3015 is made up of live axle 3061, roller 3062, roller shaft 3063.Live axle 3061 is fixed on cylinder cap by pitman arm shaft briquetting 3064, bearing 3065, ensure certain position relationship with pitman arm shaft 3003; pitman arm shaft briquetting 3064 front end secure rocker 3003, rear end supporting driving shaft 3061, live axle 3061 can rotate freely on pitman arm shaft briquetting 3064.Roller shaft 3063 is arranged on the end of brake rocker arm lining 3005, and roller 3062 is arranged on roller shaft 3063, and live axle 3061 relevant position arranges protruding 3611.When live axle 3061 rotates under the driving of control mechanism, protruding 3611 driving rolls 3062 drive brake rocker arm lining 3005 to rotate.
Scheme 3: as shown in figure 21, driving mechanism 3015 is made up of live axle 3071, gear 3072.Live axle 3071 is fixed on cylinder cap by pitman arm shaft briquetting 3073, bearing 3074, ensure certain position relationship with pitman arm shaft 3003; pitman arm shaft briquetting 3073 front end secure rocker 3003, rear end supporting driving shaft 3071, live axle 3071 can rotate freely on pitman arm shaft briquetting 3073.Gear 3072 is arranged on live axle 3071, and the tip designs of brake rocker arm lining 3005 becomes the gear 3072 on gear structure and live axle 3071 to be meshed.When live axle 3071 rotates under the driving of control mechanism, gear 3072 drives the gear structure of brake rocker arm lining 3005 end, drives brake rocker arm lining 3005 to rotate.
To introduce the working procedure of closed loop control braking system 3100 in detail below, Crankshaft motion drives camshaft 3007 to rotate.Cam 3702 on camshaft 3007 drives exhaust rocker arm assembly 3001 to rotate around pitman arm shaft 3003, and open and close exhaust valve 3013, second row valve 3014 realize exhaust stroke; Brake cam 3701 on camshaft 3007 drives brake rocker arm to rotate around pitman arm shaft 3003, realizes engine braking function.
As shown in Figure 7, during engine work, the axial location of brake rocker arm lining 3005 is A, and adjust on bolt 3006 and air valve bridge 3012 and there is certain gap between sliding pin 3121, this gap enough overcomes the braking lift produced when brake cam 3701 drives brake rocker arm 3002 to rotate.Camshaft 3007 rotates, brake cam 3701 contacts with brake rocker arm roller 3004, and drive brake rocker arm 3002 to rotate around pitman arm shaft 3003, the gap between adjustment bolt 3006 and sliding pin 3121 overcomes braking lift, do not drive sliding pin 3121, inoperative to exhaust valve 3013.
During the work of engine valve actuating device, under the effect of control mechanism, driving mechanism 3015 rotates thus drives brake rocker arm lining 3005 to rotate, axial location becomes A ', brake rocker arm 3002 moves downward along with brake rocker arm lining 3005 rotates, drive adjustment bolt 3006 to move down, thus change the distance between the sliding pin 3121 on adjustment bolt 3006 and air valve bridge 3012, the little lift on brake cam 3701 works.Camshaft 3007 rotates, and brake cam 3701 contacts with brake rocker arm roller 3004, drives brake rocker arm 3002 to rotate around pitman arm shaft 3003, drives the sliding pin 3121 on air valve bridge 3012 to open the continuously adjustabe that exhaust valve 3013 realizes braking valve lift.
When engine valve actuating device does not work, control mechanism drives driving mechanism opposite spin, thus makes brake rocker arm lining 3005 return to initial position, and the little lift of brake cam is inoperative, engine work.
In sum, owing to have employed above technical characteristics, the present invention is made to have following advantage and good effect compared to prior art:
The first, electric engine brake device structure of the present invention is simple, good rigidity, and cost is low;
The second, the position relationship of component in the continuable change braking system of apparatus of the present invention, makes braking valve opening time and lift continuously change, improves the braking ability in full speed range;
Three, the present invention is when excessive discharge temperature, open exhaust valve in advance by valve actuating device, gas pressure during reduction compression stroke, thus reduce cylinder temperature, avoid engine overheat to reduce part life, improve the reliability of engine braking operation process.
Invention preferred embodiment just sets forth the present invention for helping.Preferred embodiment does not have all details of detailed descriptionthe, does not limit the embodiment that this invention is only described yet.Obviously, according to the content of this specification, can make many modifications and variations.This specification is chosen and is specifically described these embodiments, is to explain principle of the present invention and practical application better, thus makes art technician can utilize the present invention well.The present invention is only subject to the restriction of claims and four corner and equivalent.It is only preferred embodiment of the present invention above; but be not used for limiting itself; anyly have the knack of those skilled in the art when without prejudice to spiritual connotation of the present invention, the equalization change done and changing, all should drop in protection scope of the present invention.
Claims (7)
1. the genemotor braking executive device with live axle, comprise exhaust rocker arm assembly (3001), brake rocker arm (3002), pitman arm shaft (3003), brake rocker arm lining (3005), adjustment bolt (3006), camshaft (3007), control mechanism, air valve bridge (3012), exhaust valve (3013), driving mechanism (3015), position transducer (3016) and torsion spring (3017); Described exhaust rocker arm assembly (3001) and described brake rocker arm (3002) are arranged adjacent each other on described pitman arm shaft (3003), open exhaust valve (3013) at engine compresses near top dead center and realize engine braking, it is characterized in that: the upper increase brake cam (3701) of the camshaft (3007) of motor, described brake cam (3701) drives described brake rocker arm (3002); Described brake rocker arm lining (3005) rotates, compensate reserved valve clearance, the little lift of brake cam (3701) works, under the driving of described brake rocker arm (3002), exhaust valve (3013) is opened as requested, plays the object of engine braking; Described driving mechanism (3015) comprises live axle (3051), ball pin (3052), driveshaft (3053) and round key (3054); Described live axle (3051) is fixed on cylinder cap with pitman arm shaft briquetting (3008) and bearing (3009), described live axle (3051) can rotate freely in described bearing (3009), and described live axle (3051) is provided with drive shaft hole (3511); Described driveshaft (3053) end is provided with and drives rod aperture (3531), and front end is provided with spherical nest (3532), and described brake rocker arm lining (3005) end is provided with rocker arm bush hole (501); Described driveshaft (3053) and described brake rocker arm lining (3005) link together through described rocker arm bush hole (501) and described driving rod aperture (3531) by described round key (3054); Described ball pin (3052) end is arranged in the described drive shaft hole (3511) of described live axle (3051), rotate with the rotation of described live axle (3051), described ball pin (3052) front end is arranged in the spherical nest (3532) of described driveshaft (3053) front end; The swing arm of described ball pin (3052), driveshaft (3053) and brake rocker arm lining (3005) forms three-link mechanism, described live axle (3051) rotates under the driving of described control mechanism, drive described ball pin (3052) and described driveshaft (3053) motion, thus drive described brake rocker arm lining (3005) to rotate.
2. the genemotor braking executive device of band live axle according to claim 1, it is characterized in that: described brake rocker arm (3002) is not when braking device works, do not affect the motion of exhaust valve (3013), when braking device works, engine braking can be realized.
3. the genemotor braking executive device of band live axle according to claim 1, is characterized in that: the adjustment bolt (3006) on described brake rocker arm (3002) and the gap between the sliding pin (3121) on air valve bridge (3012) can overcome the little lift of brake cam (3701).
4. the genemotor braking executive device of band live axle according to claim 1, it is characterized in that: described brake rocker arm lining (3005) can rotate around described pitman arm shaft (3003), compensate the gap between the adjustment bolt (3006) on described brake rocker arm (3002) and the sliding pin (3121) on air valve bridge (3012).
5. the genemotor braking executive device of band live axle according to claim 1, it is characterized in that: described brake rocker arm lining (3005) eccentric position in rotary course changes, and makes described brake rocker arm (3002) change in location.
6. the genemotor braking executive device of band live axle according to claim 1, is characterized in that: described torsion spring (3017) makes described brake rocker arm (3002) contact with camshaft (3007) all the time in engine working process.
7. the genemotor braking executive device of band live axle according to claim 1, is characterized in that: the end of described brake rocker arm lining (3005) is connected with driving mechanism (3015).
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| CN103954801A (en) * | 2014-05-19 | 2014-07-30 | 无锡隆盛科技股份有限公司 | Measuring device of rotating speed sensor |
| DE102014008378A1 (en) * | 2014-06-05 | 2015-12-17 | Daimler Ag | Engine braking device for an internal combustion engine |
| CN104251147A (en) * | 2014-09-24 | 2014-12-31 | 中国第一汽车股份有限公司 | Independent-cam type engine braking device |
| US20180281121A1 (en) * | 2017-03-31 | 2018-10-04 | Lincoln Global, Inc. | Gantry table with adjustable rails |
| TR201720332A2 (en) * | 2017-12-14 | 2019-07-22 | Ford Otomotiv Sanayi As | A CULTIVATOR MECHANISM |
| CN109667639A (en) * | 2018-12-28 | 2019-04-23 | 潍柴动力股份有限公司 | Engine braking system |
| CN115111020B (en) * | 2022-06-30 | 2024-04-30 | 苏立群 | Stepless variable lift valve rocker mechanism |
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| US6382151B2 (en) * | 2000-02-24 | 2002-05-07 | Delphi Technologies, Inc. | Ring gear variable valve train device |
| EP1905967B1 (en) * | 2006-09-25 | 2009-12-16 | Honda Motor Co., Ltd. | Variable valve lift internal combustion engine |
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| CN1052780C (en) * | 1993-06-22 | 2000-05-24 | 沃尔沃公司 | Valve mechanism for an internal combustion engine |
| CN101849086A (en) * | 2007-08-06 | 2010-09-29 | 依维柯公司 | Device for actuating the decompression engine brake in an internal combustion engine provided with hydraulic tappets |
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