CN101349178A - Rocker arm integrated type brake device of four-stroke internal combustion engine - Google Patents
Rocker arm integrated type brake device of four-stroke internal combustion engine Download PDFInfo
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- CN101349178A CN101349178A CNA2008100637495A CN200810063749A CN101349178A CN 101349178 A CN101349178 A CN 101349178A CN A2008100637495 A CNA2008100637495 A CN A2008100637495A CN 200810063749 A CN200810063749 A CN 200810063749A CN 101349178 A CN101349178 A CN 101349178A
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Abstract
The invention provides a rocker-integrating type braking device for four-stroke internal combustion engines. Control and check valve mechanisms (8 and 9) are integrated at one end of a valve of a rocker (3) and a clearance compensation mechanism (11); a plunger of the clearance compensation mechanism is always in contact with the upper end of an exhaust valve (5); a braking protrusion (10) is arranged on the molded line of an exhaust cam (2) of an engine; the control and check valve mechanisms are coaxial with the clearance compensation mechanism, and the control and check valve mechanisms and the exhaust valve are coaxially arranged in a cylindrical cavity on the rocker; and a plunger spring in the clearance compensation mechanism is a valve core spring, and a valve core cavity is a plunger cavity of the clearance compensation mechanism. Compared with the prior art, two functional mechanisms for compression and braking of a rocker-integrating type engine are not arranged in a disjoint and mutually perpendicular way but are arranged coaxially in the invention, thereby simplifying structure, reducing the difficulty of machining the exhaust rocker, raising the rigidity of the rocker, raising the reliability of gas distribution mechanisms and raising the accuracy and maneuverability of braking the clearance adjustment of a cam.
Description
Technical field
What the present invention relates to is a kind of rocker arm integrated type brake device of four-stroke internal combustion engine, is a kind of auxiliary brake device for automobile, belongs in the machinery with the technical field of combustion engine as break.
Background technique
At present, as a kind of form of auxiliary braking, four-stroke ic engine braking relies on its braking effect good, and fringe cost is few, advantages such as reliability height, being applied on the commercial car more and more widely.The contribution of engine braking is to promote the stopping power of vehicle complete vehicle on the one hand, is to alleviate the brake load of automobile main brake on the other hand.
The principle of four-stroke ic engine braking is by raising piston resistance to motion, and this resistance is acted on the automotive wheel by bent axle and automotive transmission, comes to be car deceleration thereby form braking force.Many and the exhaust braking valve of engine braking is united use, and exhaust braking valve is installed in behind the engine exhaust pipe or behind the pressurized machine, when engine braking is worked, butterfly valve in its valve body cuts out, block outlet pipe, thereby promote exhaust back pressure, improve the resistance of piston motion.
A kind of implementation of four-stroke ic engine braking is the braking of losing heart, promptly before the engine charge end of stroke, exhaust valve is opened a little lift because of the big negative pressure that produces in the cylinder, in air valve bridge or rocking arm, a lift holding device is arranged, make exhaust valve keep this lift, begin, so just weakened the positive work that pressurized gas is done piston at expansion stroke up to exhaust stroke.This kind mode has improved the braking force of engine braking to a certain extent, but exhaust valve opens always, makes the piston motion resistance reduce, and whole potentiality of engine braking is not brought into play.
The another kind of implementation of four-stroke ic engine braking is a compression brake, promptly before the engine charge end of stroke, with exhauxt valve opens, make outlet pipe internal cause exhaust braking valve close formed pressurized gas and reflux, increase in-cylinder pressure, after compression stroke just begins, with exhaust valve closing, like this, just in compression stroke, increase gaseous mass, increased the piston resistance.Before compression stroke ends, once more with little lift of exhauxt valve opens, discharge pressurized air, and after expansion stroke begins with exhaust valve closing, make piston not do positive work.This mode has been given full play to the potentiality of engine braking, has promoted engine brake power.
The structural type that realizes the four-stroke ic engine compression brake mainly contains following several: one, increase the hydraulic mechanism by electromagnetic valve and realize engine compression brake on motor, the shortcoming of this structural type is that volume is bigger, structure is complicated, increased the space on motor top on the one hand, increased complete machine weight on the one hand, fringe cost is higher; Two, increase a little valve on motor, be responsible for engine braking specially, its shortcoming is the layout that has limited other valve, and needs an additional rocking arm and additional cams to control its lift, has increased the weight and the cost of motor to a certain extent; Three, the engine braking function is integrated in the exhaust rocker arm, realizes engine braking by increasing the cam detent bumps, this mechanism structure is comparatively compact, in light weight, under the prerequisite that realizes function, has farthest reduced complete machine weight and cost.
Engine compression brake device at rocker arm integrated type, be in the rocker arm integrated type brake device of four-stroke internal combustion engine; there are two functional entities Rocker arm assembly inside; first functional entity is used for compensation by the caused valve lift of cam detent bumps; make exhaust valve when engine braking is not worked; not open with the cam detent bumps, guaranteed the normal operation of motor; Second functional entity is that engine braking is realized mechanism, it is by the control to brake circuit, make the closed check valve of braking oil pocket, form high pressure oil in the oil pocket, when cam rotates to detent bumps, open exhaust valve and realize braking function, when engine braking is not worked, one-way valve in this mechanism is held open state under the effect of control plunger, exhaust valve is not opened with the cam detent bumps, has guaranteed the proper functioning of motor.
Introduced a kind of detailed structure of rocking arm integrated engine braking device among existing rocker arm integrated type brake device of four-stroke internal combustion engine such as the US5564385 " with the method and apparatus of multi-cylinder internal combustion engine to automobile brake ": rocking arm is installed on the pitman arm shaft that hollow is vertical oil duct, cam is under the effect of engine crankshaft, rotatablely moving of itself acted on the rocker body, and cam is provided with detent bumps.Its rocker compensating gear is positioned at an end of rocking arm, comprises the plunger that can be in hydraulic pressure cavity moves up and down along the valve motion direction and the spring in the plunger.Under hydraulic pressure, can make plunger in rocking arm, be in different positions, thereby determine whether image angle parts by rocking arm with the transmission of movement of rocking arm to valve.Hydraulic pressure cavity in the rocker compensating gear (plunger rear) links to each other with vertical oil duct in the pitman arm shaft, has one to connect oil duct in the rocking arm, by control and one-way valve structures vertical oil duct is connected to hydraulic pressure cavity.When being high oil pressure in the hydraulic pressure cavity, the detent bumps of cam makes shaking of rocking arm pass to valve, and when being low oil pressure in the hydraulic pressure cavity, this shakes and will be absorbed by the spring in the plunger, promptly realizes the gap compensate function.One an of end that said control and one-way valve structures are installed in the gapped compensation mechanism of rocking arm is parallel in the cylindrical cavity of rock wall ax, and it comprises the similar funnel-shaped plunger of terminal end shape and the piston spring in the plunger that can move in hydraulic pressure cavity, be in that the valve seat of funnel point is passed in spool ball, centre on the plunger funnel point and with the ball spring of spool ball top to valve seat.Vertically oil duct is connected to hydraulic pressure cavity (plunger the place ahead, funnel contraction place).When hydraulic pressure cavity inner engine oil pressure was lower than the low limit value of setting, the spool ball was opened the oil circuit that leads to rocker compensating gear under the piston spring effect.When hydraulic pressure cavity inner engine oil pressure was higher than the low limit value of setting, plunger overcomes spring under the engine oil pressure effect active force lifted, and the spool ball is closed the oil circuit that leads to rocker compensating gear under the effect of ball spring.Like this, when engine braking worked, vertically oil circuit was exported high oil pressure, the oil circuit that leads to rocker compensating gear is closed and makes rocker compensating gear obtain high oil pressure, and the detent bumps on the cam acts on valve and realizes the automobile auxiliary braking.When engine braking is not worked, be low oil pressure in the oil circuit vertically, the oil circuit that leads to rocker compensating gear is in opening state, and promptly the detent bumps on the cam does not act on valve.
Above-mentioned rocker arm integrated type brake device of four-stroke internal combustion engine, because integrated rocker compensating gear and control and one-way valve mechanism divide in disjoint two orthogonal cylindrical cavities in the rocking arm, its internal structure is comparatively complicated, has improved processing cost; This structure descends balance and rocking arm rigidity to some extent simultaneously, and the motion of unfavorable distribution device has reduced the reliability of distribution device.
Summary of the invention
At last art deficiency, technical problem to be solved by this invention is further to improve rocker compensating gear and control and the one-way valve mechanism structure set on rocking arm, thereby eliminate and weaken above-mentioned multiple unfavorable factor, proposes a kind of reliable, simple rocker arm integrated type brake device of four-stroke internal combustion engine.
Rocker arm integrated type brake device of four-stroke internal combustion engine provided by the invention, be integrated with funnel-shaped plunger at rocking arm valve one end, piston spring, spool, valve core spring, control that valve seat constitutes and one-way valve mechanism and with plunger, the rocker compensating gear that piston spring constitutes, the plunger of rocker compensating gear contacts all the time with the exhaust valve upper end, on the exhaust cam molded lines of motor, increase detent bumps is arranged, the compensation rate of rocker compensating gear is the caused valve lift of cam detent bumps, said control and one-way valve mechanism and rocker compensating gear coaxial and with the coaxial cylindrical cavity that is installed on the rocking arm of exhaust valve in, piston spring in the said rocker compensating gear is the said valve core spring that is, spool place cylinder chamber is the cylinder chamber at the plunger place of rocker compensating gear.
Rocker arm integrated type brake device of four-stroke internal combustion engine provided by the invention, integrated control and one-way valve mechanism in the exhaust rocker arm, this mechanism is made up of one-way valve assembly and control plunger piston assembly, also coaxial integrated rocker compensating gear, be the control oil pocket at valve seat to control plunger one side, be the braking oil pocket to compensation plunger one side.The control plunger is opened one-way valve all the time when not braking under the effect of spring force, and when needs were braked, pressure machine oil entered the control oil pocket by brake circuit, at jack-up control plunger simultaneously, is full of the braking oil pocket, and closes one-way valve.The braking oil pocket has just formed the high-voltage oil cavity of a sealing when closed check valve, and exhaust valve just can be opened along with the cam detent bumps, realizes the engine compression brake function.
Compared with prior art, the invention has the advantages that:
With two coaxial installations of functional entity of rocker arm integrated type engine compression brake but not disjoint two vertical mutually installations simplify the structure, reduced the difficulty of processing of exhaust rocker arm, improved rocking arm rigidity; This structure has improved the balance of structure simultaneously, directly is connected the reliability that has improved distribution device with one-way valve with the braking oil pocket, has improved the accuracy and the operability of brake cam gap adjustment.
Rocker arm integrated type brake device of four-stroke internal combustion engine provided by the invention, the detent bumps that increases on the exhaust cam molded lines of motor has two, before a detent bumps originates in the engine charge end of stroke, after ending at compression stroke and just having begun; Before another projection originates in compression stroke and ends, after ending at expansion stroke and beginning.Before promptly a detent bumps makes the engine charge end of stroke, with exhauxt valve opens, making outlet pipe internal cause exhaust braking valve close formed pressurized gas refluxes, increase in-cylinder pressure, after compression stroke just begins, with exhaust valve closing, like this, just in compression stroke, increase gaseous mass, increased the piston resistance; Another projection makes before compression stroke ends, and once more with little lift of exhauxt valve opens, discharges pressurized air, and after expansion stroke begins with exhaust valve closing, make piston not do positive work.Be that this structure has increased braking function.
Rocker arm integrated type brake device of four-stroke internal combustion engine provided by the invention, said exhaust valve have two, and two exhaust valves upper end connects with exhaust valve, and one of them exhaust valve is fixedlyed connected with exhaust valve bridge, and one is connected with exhaust valve bridge through the valve pushing block; Said valve pushing block is down T-shaped block part, air valve bridge is installed exhaust valve position up-small and down-big valve pushing block installing space, the valve pushing block have upwards end face and valve pushing block installing space in downward end face offset, the plunger lower end surface of rocker compensating gear contacts all the time on valve pushing block upper-end surface and the rocking arm; Other has one to resemble leg structure, and this resembles leg structure is one to be fixedly installed in the shaft-like part on the rocking arm, and this resembles the axis that leg structure is parallel to the installing space of rocker compensating gear on the rocking arm; In exhaust valve bridge, be integrated with rocker compensating gear, the one opening cylinder chamber that makes progress promptly on connecting the intermediate point of two exhaust valve position, air valve bridge is arranged, one spring wherein is installed, one plunger is arranged on the spring, the lower end surface that resembles leg structure on the lift sum that its compensate for clearance amount is valve clearance and detent bumps, the plunger of the rocker compensating gear on air valve bridge upper end and rocking arm contacts all the time.Be that the present invention brakes the functional purpose that uses one of them exhaust valve for two exhaust valves of realization work use, resemble the position of pin and between rocking arm and a valve, a rocker compensating gear is set respectively at contact rocking arm on the exhaust valve bridge respectively.The gap that the compensation of previous gap is regulated is the caused valve lift sum of conventional valve clearance and cam detent bumps, and the gap that the compensation of a back gap is regulated is the caused valve lift of cam detent bumps.Make when needing braking on the rocking arm rocker compensating gear that the cam detent bumps is reflected to valve to pushing of rocking arm and carry out auxiliary braking, rocker compensating gear is reflected to valve with the cam detent bumps to pushing of rocking arm on the rocking arm and make when not needing to brake, rocker compensating gear on the while air valve bridge, just the cam detent bumps is reflected to valve to pushing of rocking arm all the time.Remedy prior art intermediate gap compensation mechanism in rocking arm inside, be difficult to accurately regulate the valve clearance, brought the deficiency of certain influence to assembling.
Description of drawings
Fig. 1 is an exhaust distribution device cross-sectional view of the present invention, among the figure: the exhaust distribution device of 1-four stroke engine, 2-exhaust cam, the 3-exhaust rocker arm, 4-exhaust valve bridge, 5-exhaust valve, the 6-solenoid valve, the 7-brake circuit, 8-controls plunger mechanism, the 9-one-way valve, the detent bumps on the 10-2,11-rocker compensation mechanism, the 12-lubricating oil path, 13-exhaust valve bridge rocker compensating gear, 14-adjusts screw and resembles pin, and 15-brakes oil pocket;
Fig. 2 is a valve lift curve schematic representation of the present invention, among the figure: two of a, b-braking lift, the c-lift of working, the h-longitudinal axis (valve lift), α-transverse axis (crank angle);
Fig. 3 is the cross-sectional view of part 3 among Fig. 1, among the figure: the 3-exhaust rocker arm, the 16-rocker body, 17-controls plunger, 18-return spring, the 19-spring seat, 20-locatees jump ring, 21-spool, 22-clearance compensating spring, the spacing jump ring of 23-, 24-adjusts screw, and 25-adjusts nut, and 26-resembles pin;
Fig. 4 is the cross-sectional view of part 4 among Fig. 1, among the figure: the 4-exhaust valve bridge, 27-exhaust valve pontic, the 28-mounting screw, 29-installs catch, 30-valve pushing block, 31-pushing block jump ring, 32-gap compensation plunger, 33-clearance compensating spring;
Fig. 5 is the plan view of part 4 among Fig. 1, among the figure: the 4-exhaust valve bridge, the 28-mounting screw, 29-installs catch
Fig. 6 is the axle side schematic representation of part 32 among Fig. 4, among the figure: 32-gap compensation plunger, 34,35, the 36-oilhole;
Fig. 7 is the cross-sectional view of exhaust valve bridge another program of the present invention, among the figure: 4-exhaust valve bridge, 39-brake clearance compensation plunger, 40-clearance compensating spring, 41-latch;
Fig. 8 is an electromagnetic valve oil circuit schematic representation of the present invention, among the figure: 6-solenoid valve, 42-oil circuit COMM communication, 43-pitman arm shaft, 44-bleed off circuit, 45-valve block, 46-working connection, 47-lubricating oil path, 48-brake circuit A, 49-brake circuit B.
Specific embodiments
Describe specific embodiments of the present invention in detail below in conjunction with accompanying drawing.
What Fig. 1 represented is the exhaust distribution device 1 of a four stroke engine, and this exhaust distribution device 1 is by exhaust cam 2, exhaust rocker arm 3, and exhaust valve bridge 4 and exhaust valve 5 are formed.Exhaust rocker arm 3 is installed in swaggers on the arm axle, and pitman arm shaft is a hollow, wherein is vertical oil circuit.On exhaust rocker arm 3 one ends driven member is installed, cooperates, two detent bumps 10 are arranged on the exhaust cam with exhaust cam 2 on being installed in bent axle.Exhaust rocker arm 3 the other ends cooperate with exhaust valve, and rocking arm drives exhaust valve work when making cam rotation.Said exhaust valve has two, and the exhaust valve rod upper end is against exhaust valve bridge 4 two ends.Control plunger mechanism 8, one-way valve 9, rocker compensation mechanisms 11 with an exhaust valve 5 coaxial being equipped with up and down on the exhaust rocker arm 3.Between vertical oil circuit of pitman arm shaft hollow and control plunger mechanism 8 plunger cavities lubricating oil path 12 is arranged, and between the control plunger mechanism 8 plunger front ends brake circuit 7 is arranged.Control plunger mechanism 8 plunger front ends are connected with braking oil pocket 15 in the rocker compensation mechanism 11 through one-way valve 9.Exhaust valve bridge 4 mid points are equipped with the axis exhaust valve bridge rocker compensating gear 13 parallel with exhaust valve, are coaxially installed with and adjust screw and resemble pin 14 on the exhaust rocker arm 3 with on the exhaust valve bridge rocker compensating gear 13-2.The adjustment screw resembles between pin 14 installation cavitys and control plunger mechanism 8 plunger cavities also lubricating oil path 12.Solenoid valve 6 is mounted in vertical oil circuit upstream.
When the motor proper functioning, solenoid valve 6 controls make brake circuit 7 stop up, brake circuit 7 does not have pressure machine oil, control plunger mechanism 8 in the exhaust rocker arm 3 makes the one-way valve 9 in the exhaust rocker arm 3 be held open state, is offset because of the effect of exhaust rocker arm rocker compensating gear 11 by the detent bumps 10 caused braking valve lifts of exhaust cam 2.Lubricating oil path 12 remains unobstructed, its objective is in order to alleviate each motion in the exhaust rocker arm exhaust valve bridge rocker compensating gear 13 and adjust the wearing and tearing that screw resembles 4 of pin 14 and exhaust valve bridges.The detent bumps 10 caused exhaust valve bridge lifts that exhaust valve bridge rocker compensating gear 13 is offset by exhaust cam 2.When engine compression brake is worked, solenoid valve 6 controls make that brake circuit 7 is unobstructed, pressure machine oil is through brake circuit jack-up control plunger mechanism 8, simultaneously, be full of the braking oil pocket 15 of exhaust rocker arm rocker compensating gear 11 through one-way valve 9, one-way valve 9 is closed immediately, when exhaust cam 2 rotates to detent bumps 10, because the effect of exhaust rocker arm rocker compensating gear 11 braking oil pockets 15 mesohigh oil, exhaust valve 5 is opened the braking lift, realizes engine compression brake.
Two detent bumps 10 that exhaust cam 2 has, when engine braking is worked, certain opens exhaust valve 5 detent bumps 10 constantly before aspirating stroke ends, pressurized gas in the outlet pipe are refluxed, increase in-cylinder pressure, after compression stroke just begins, exhaust valve 5 cuts out, increased the piston motion resistance; Certain opens a little lift with exhaust valve 5 to another detent bumps 10 constantly before the engine compresses end of stroke, discharges pressurized air, and after expansion stroke begins exhaust valve 4 cuts out, and makes piston not do positive work, realizes the engine compression brake function.
Valve lift curve when Fig. 2 has showed engine compression brake.Two braking lift a, the b that it comprises on two exhaust cams that two detent bumps cause and the lift c that works normally.The situation of change of valve lift is above discussed, and does not just give unnecessary details at this.
Fig. 3 detail display be that the internal structure of exhaust rocker arm 3 is formed.This exhaust rocker arm 3 is controlled plunger mechanism 8 by rocker body 16, and one-way valve 9, rocker compensation mechanism 11 and adjustment screw resemble pin 14 and form.In rocker body 16, be processed with brake circuit 7, the control plunger mechanism 8 of lubricating oil path 12 and coaxial arrangement, one-way valve 9, rocker compensation mechanism 11 installing spaces (cylinder chamber) are adjusted screw and are resembled pin 14 installing spaces and pitman arm shaft mounting hole.Control plunger 17 is funnel shape cap shape parts, and the funnel point is installed in downwards to be controlled in plunger mechanism 8 installing spaces, in the control plunger 17 cap tubes return spring 18 is installed, and props up with spring seat 19 and locatees with location jump ring 20.To be holes pass and be connected with one-way valve 9 installing spaces for the funnel point in rocker compensation mechanism 11 installing space bottoms, and this hole is the valve seat of one-way valve simultaneously, and the one-way valve spool is installed in one-way valve 9 installing spaces.Rocker compensation mechanism 11 installing spaces and one-way valve 9 installing spaces are the same space, mounting cap shape spool 21 wherein, crown outwards points to exhaust valve 5 and limits extreme lower position with spacing jump ring 23, assemblage gap counterbalance spring 22 in the cap tube, clearance compensating spring 22 the other ends are against on the spool.Resemble installation adjustment screw 24 upper ends adjustment nut 25 its axial positions of adjustment in pin 14 installing spaces at the adjustment screw, the lower end is to resemble pin 26.There is lubricating oil path to lead in the adjustment screw and resembles end face center, underfooting.
When engine braking is worked, pressure machine oil overcomes the spring force of return spring 18, to control plunger 17 jack-up, when engine braking is not worked, control plunger 17 opens one-way valve 9 under the effect of return spring 18 all the time, when design, required lift was converted the spring force of return spring 18 when the lift that must make pressure machine oil act on control plunger 17 was closed greater than one-way valve 9, so that one-way valve 9 can be closed smoothly.
The effect of spool 21 is when engine braking is worked, and opens exhaust valve 5 under the active force of braking oil pocket 15 inner high voltage oil; The effect of clearance compensating spring 22 is when engine braking is not worked, and backs down one-way valve 9, makes in the braking oil pocket 15 and can not form high pressure oil, thereby eliminate the detent bumps 10 caused valve lifts of exhaust cam 2; The effect one of spacing jump ring 23 is to make spool 21 and clearance compensating spring 22 can be installed in the exhaust rocker arm, and do not eject, the 2nd, when engine braking is worked, before compression stroke ends, the opening degree of restriction exhaust valve 5 is avoided exhaust valve 5 and piston collisions.
Fig. 4 and Fig. 5 detail display exhaust valve bridge 4 structure before installing form.This exhaust valve bridge 4 is by exhaust valve pontic 27, valve clearance compensation mechanism 13, and valve pushing block 30 and pushing block jump ring 31 are formed.Process compensation mechanism 13 installing spaces in valve clearance in the exhaust valve pontic 27, valve end installing space and valve pushing block 30 installing spaces.Compensation mechanism 13 installing spaces in valve clearance are holes that make progress, and wherein the assemblage gap counterbalance spring 33, go up compensation plunger 32 in valve clearance is installed.With mounting screw 28 a slice is installed above the exhaust valve pontic 27 catch 29 is installed, catch 29 is installed is pressed on the valve clearance compensation plunger 32 so that plunger is ejected.On exhaust valve pontic 27 and rocking arm gap compensating coaxial, a up-small and down-big reducing cylindrical hole is arranged, valve pushing block 30 is the up-small and down-big reducing cylindrical bodys that cooperate with it, valve end installing space is arranged on valve pushing block 30 lower end surfaces, and the upper end is equipped with pushing block jump ring 31.
When assembling exhaust valve bridge 4, the exhaust valve bridge 4 of earlier valve pushing block 30 being packed into, then pushing block jump ring 31 is installed on the valve pushing block 30, exhaust valve bridge 4 intermediate portions of again clearance compensating spring 33 and gap compensation plunger 32 being packed into successively, catch 29 will be installed at last be fixed on the exhaust valve pontic 27 by mounting screw 28, its effect is fixed interval (FI) compensation plunger 32 and clearance compensating spring 33.The exhaust valve bridge 4 that assembles is installed on the exhaust valve 5.When regulating the valve clearance, at first will adjust the instrument plug to resembling between pin 26 and the gap compensation plunger 32, the regulated quantity of valve clearance is regulated according to the detent bumps 10 caused valve lift sums of conventional valve clearance and exhaust cam 2, after mixing up, take the adjustment instrument away, mounting screw 28 is unloaded, take away catch 29 is installed, gap compensation plunger 32 is upspring under the effect of spring force, and with resemble pin 26 near, thereby, realize offsetting the function of air valve bridge braking lift in engine braking work with when not working.
The structure of another kind of exhaust valve bridge 4 is formed as shown in Figure 7, can be in order to replace.This exhaust valve bridge 4 is equally by the exhaust valve pontic, the valve clearance compensation mechanism, and valve pushing block and pushing block jump ring are formed.Its intermediate gap compensation plunger 39 is T-shaped cylinders, and its underpart is with valve clearance counterbalance spring 40 and passes the end of valve clearance compensation mechanism installing space.Valve clearance counterbalance spring 40 is against at the end and gap compensation plunger 39 of valve clearance compensation mechanism installing space.When assembling exhaust valve bridge 4, rocker compensating gear 38 is fixed on the exhaust valve bridge 4 by latch 41, and extracts after the adjusting of valve clearance, and the method for valve adjustments is identical with structure one.
The structure that realizes exhaust valve bridge gap compensate function is not limited to above two kinds, does not just give unnecessary details at this.
Fig. 8 detail display the oil circuit control of solenoid valve 6.The oil circuit control of solenoid valve 6 comprises solenoid valve 6, oil circuit COMM communication 42 and pitman arm shaft 43.In oil circuit COMM communication 42, process bleed off circuit 44, the valve block 45 that solenoid valve is controlled places bleed off circuit 44.In pitman arm shaft 43, process working connection 46, lubricating oil path 47, brake circuit A48 and brake circuit B49, wherein lubricating oil path 47 and the profit in working connection 46 and the exhaust rocker arm 3 road 12 of changing oil communicates, brake circuit B49 communicates with working connection 46, and brake circuit A48 communicates with brake circuit 7 in the exhaust rocker arm 3, does not communicate with working connection 46 in the pitman arm shaft 43.When solenoid valve 6 control valve blocks 45 are closed, block bleed off circuit 44, there is not pressure machine oil to flow through among the brake circuit A48, engine braking is not worked; When solenoid valve 6 control valve blocks 45 were opened, bleed off circuit 44 was opened, and pressure machine oil flows to brake circuit 7 in the exhaust rocker arm 3 by brake circuit A48, realizes the engine braking function; Lubricating oil path 47 is unimpeded all the time, for each mechanism in the exhaust rocker arm 3 and air valve bridge 4 lubricated.
The method of realization solenoid valve oil circuit control has a variety of, does not just give unnecessary details at this.
In sum, rocker arm integrated type brake device of four-stroke internal combustion engine provided by the invention, exhaust cam 2 also has two detent bumps 10 except that a work projection, and when engine operation, exhaust cam 2 is along with bent axle rotates, and each projection promotes the rocking arm swing.When the motor proper functioning, solenoid valve 6 is by brake circuit 7, control plunger mechanism 8 in the exhaust rocker arm 3 makes one-way valve 9 be held open state, exhaust rocker arm rocker compensating gear 11 works, and at this moment all will be cancelled by the swing of the rocking arm that two detent bumps 10 cause of exhaust cam 2 and not press valve 5.And the rocking arm swing that two detent bumps 10 that the rocker compensating gear 13 on the exhaust valve bridge 4 is eliminated exhaust cam 2 cause, the rocking arm swing that the work projection of acceptance causes, i.e. exhaust valve proper functioning.When engine compression brake is worked, solenoid valve 6 conducting brake circuits 7, control plunger mechanism 8 when one-way valve 9 is closed, is high oil pressure by jack-up in the braking oil pocket 15 of exhaust rocker arm rocker compensating gear 11.At this moment exhaust rocker arm rocker compensating gear 11 loses compensating action, and when making exhaust cam 2 rotate to detent bumps 10, the swing of rocking arm is delivered to exhaust valve 5, realizes engine compression brake.This moment, air valve bridge still accepted to adjust the pressure that screw resembles pin 14, after 10 valve lifts that can cause of detent bumps and normal valve gap of compensation exhaust cam 2, transmitted and shook the be pushed to valve of the work projection of exhaust cam 2 to rocking arm.
Claims (3)
1, a kind of rocker arm integrated type brake device of four-stroke internal combustion engine, be integrated with funnel-shaped plunger at rocking arm valve one end, piston spring, spool, valve core spring, control that valve seat constitutes and one-way valve mechanism and with plunger, the rocker compensating gear that piston spring constitutes, the plunger of rocker compensating gear contacts all the time with the exhaust valve upper end, on the exhaust cam molded lines of motor, increase detent bumps is arranged, the compensation rate of rocker compensating gear be the cam detent bumps the valve lift that can cause, it is characterized in that said control and one-way valve mechanism and rocker compensating gear coaxial and with the coaxial cylindrical cavity that is installed on the rocking arm of exhaust valve in, piston spring in the said rocker compensating gear is valve core spring, and spool place cylinder chamber is the cylinder chamber at the plunger place of rocker compensating gear.
2, rocker arm integrated type brake device of four-stroke internal combustion engine as claimed in claim 1, it is characterized in that the detent bumps that increases has two on the exhaust cam molded lines of motor, before a detent bumps originates in the engine charge end of stroke, after ending at compression stroke and just having begun; Before another projection originates in compression stroke and ends, after ending at expansion stroke and beginning.
3, rocker arm integrated type brake device of four-stroke internal combustion engine as claimed in claim 1, it is characterized in that said exhaust valve has two, two exhaust valves upper end connects with exhaust valve, and one of them exhaust valve is fixedlyed connected with exhaust valve bridge, and one is connected with exhaust valve bridge through the valve pushing block; Said valve pushing block is down T-shaped block part, air valve bridge is installed exhaust valve position up-small and down-big valve pushing block installing space, the valve pushing block have upwards end face and valve pushing block installing space in downward end face offset, the plunger lower end surface of rocker compensating gear contacts all the time on valve pushing block upper-end surface and the rocking arm; Other has one to resemble leg structure, and this resembles leg structure is one to be fixedly installed in the shaft-like part on the rocking arm, and this resembles the axis that leg structure is parallel to the installing space of rocker compensating gear on the rocking arm; In exhaust valve bridge, be integrated with rocker compensating gear, the one opening cylinder chamber that makes progress promptly on connecting the intermediate point of two exhaust valve position, air valve bridge is arranged, one spring wherein is installed, one plunger is arranged on the spring, the lower end surface that resembles leg structure on the lift sum that its compensate for clearance amount is valve clearance and detent bumps, the plunger of the rocker compensating gear on air valve bridge upper end and rocking arm contacts all the time.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100637495A CN101349178A (en) | 2008-08-04 | 2008-08-04 | Rocker arm integrated type brake device of four-stroke internal combustion engine |
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| CNA2008100637495A CN101349178A (en) | 2008-08-04 | 2008-08-04 | Rocker arm integrated type brake device of four-stroke internal combustion engine |
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| CNA2008100637495A Pending CN101349178A (en) | 2008-08-04 | 2008-08-04 | Rocker arm integrated type brake device of four-stroke internal combustion engine |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101526018B (en) * | 2009-03-11 | 2012-05-30 | 浙江黎明发动机零部件有限公司 | Compression braking device of four-stroke cycle internal combustion engine |
| CN102588030A (en) * | 2011-01-05 | 2012-07-18 | 上海尤顺汽车部件有限公司 | Auxiliary valve driving mechanism of engine |
| CN102003239B (en) * | 2009-08-31 | 2012-11-28 | 上海尤顺汽车部件有限公司 | Quick-braking engine brake device |
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| CN102003239B (en) * | 2009-08-31 | 2012-11-28 | 上海尤顺汽车部件有限公司 | Quick-braking engine brake device |
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| CN102817667B (en) * | 2012-09-10 | 2016-02-03 | 浙江亿日气动科技有限公司 | There is the frame type valve actuating device that auxiliary rocker arm application auxiliary cam drives |
| CN110242383A (en) * | 2014-06-10 | 2019-09-17 | 雅各布斯车辆系统公司 | Linkage between synkinesia source in internal combustion engine and main motion load path |
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| CN107939472A (en) * | 2017-10-17 | 2018-04-20 | 浙江大学 | Two cycle compression release type brake device of integrated engine and its braking method |
| CN107939472B (en) * | 2017-10-17 | 2023-10-27 | 浙江大学 | Two-stroke compression release type braking device of integrated engine and braking method thereof |
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| CN112424451B (en) * | 2018-07-16 | 2022-07-26 | 雅各布斯车辆系统公司 | System and method for combined engine braking and lost motion exhaust valve opening |
| CN112424451A (en) * | 2018-07-16 | 2021-02-26 | 雅各布斯车辆系统公司 | System and method for combined engine braking and lost motion exhaust valve opening |
| CN110173314A (en) * | 2019-05-15 | 2019-08-27 | 浙江大学 | A kind of air valve bridge and its exhaust brake method of achievable compression-release type engine braking |
| CN110173314B (en) * | 2019-05-15 | 2023-07-18 | 浙江大学 | Valve bridge capable of realizing compression release type engine braking and exhaust braking method thereof |
| CN110173321A (en) * | 2019-06-04 | 2019-08-27 | 浙江大学 | Engine integrated form variable rocker-arm retarder and its working method |
| CN110173321B (en) * | 2019-06-04 | 2023-07-21 | 浙江大学 | Engine integrated variable rocker arm retarder and working method thereof |
| CN110374712A (en) * | 2019-06-12 | 2019-10-25 | 浙江大学 | Integrated engine braking device and its working method |
| CN110374712B (en) * | 2019-06-12 | 2024-04-19 | 浙江大学 | Integrated engine braking device and working method thereof |
| CN112065525A (en) * | 2020-09-09 | 2020-12-11 | 潍柴动力股份有限公司 | Rocker arm mechanism and engine assembly |
| CN112065525B (en) * | 2020-09-09 | 2021-11-19 | 潍柴动力股份有限公司 | Rocker arm mechanism and engine assembly |
| US11891924B2 (en) | 2020-09-09 | 2024-02-06 | Weichai Power Co., Ltd. | Rocker arm mechanism and engine assembly |
| CN112360586A (en) * | 2020-11-10 | 2021-02-12 | 蔡金洲 | Automobile gas distribution machine mechanism accessory |
| CN112963220A (en) * | 2021-02-08 | 2021-06-15 | 广西玉柴机器股份有限公司 | Brake valve of integrated rocker arm brake mechanism and method for adjusting brake clearance |
| CN114033525A (en) * | 2021-12-16 | 2022-02-11 | 浙江康和机械科技有限公司 | Braking rocker arm, braking rocker arm system and vehicle |
| CN115163239A (en) * | 2022-06-30 | 2022-10-11 | 中国第一汽车股份有限公司 | Variable valve lift mechanism, engine and vehicle |
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