CN106640257A - Load-controllable engine braking device and engine braking method - Google Patents
Load-controllable engine braking device and engine braking method Download PDFInfo
- Publication number
- CN106640257A CN106640257A CN201510848761.7A CN201510848761A CN106640257A CN 106640257 A CN106640257 A CN 106640257A CN 201510848761 A CN201510848761 A CN 201510848761A CN 106640257 A CN106640257 A CN 106640257A
- Authority
- CN
- China
- Prior art keywords
- valve
- piston
- pressure limiting
- engine
- pressure
- 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.)
- Granted
Links
Abstract
The invention relates to a load-controllable engine braking method which comprises a process for preventing fluid pressure on an auxiliary piston in an engine braking device to a main piston. The engine braking device comprises a pressure-limiting mechanism, a pressure-limiting valve of the pressure-limiting mechanism is arranged between a main piston hole and an auxiliary piston hole, and the pressure-limiting valve is kept to be in the normal-open state through a pressure-limiting spring; a cam drives the main piston, the main piston drives the auxiliary piston through hydraulic pressure, an air valve of an engine is opened through the auxiliary piston and applies counter-acting force to the auxiliary piston, the pressure of fluid in the auxiliary piston hole is increased, pretightening force of a pressure-limiting spring on the pressure-limiting valve is overcome, the pressure-limiting valve is closed, and pressure of fluid on the auxiliary piston is prevented from being transmitted to the main piston. The pressure of the fluid on the auxiliary piston is transmitted to a stopping mechanism fixed to the engine rather than the cam of the engine. A box of the engine braking device comprises a valve bridge and a rocker of the engine. By means of the load-controllable engine braking method, loads on an engine air valve driving chain can be controlled, and the reliability and durability of the engine are increased.
Description
Technical field:
The present invention relates to mechanical field, more particularly to the controllable engine braking apparatus of engine braking technology, particularly load and engine braking methods.
Background technology:
Engine braking can be divided into compression-release braking and type braking of losing heart.
The compression-release braking of engine is to open exhaust valve in the latter half of engine piston compresses stroke.One precedent of compression-release brake is by comingses
(Cummins) disclose in U.S. Patent number 3220392 in nineteen sixty-five, mechanical input is delivered to the exhaust valve to be opened through hydraulic circuit for its brakes.It is typically included in reciprocating main piston in master piston bore on hydraulic circuit, the reciprocating motion comes from the mechanical input of engine, such as the motion of engine injection cam or the motion of adjacent exhaust cam.The motion of main piston is delivered to the auxiliary piston on hydraulic circuit by hydraulic fluid so as to move back and forth in slave piston bore, and auxiliary piston is directly or indirectly acted on exhaust valve, produces the valve motion of engine braking running.
The disappointing type braking of engine is exhaust valve in addition to normal unlatching, keeps a small amount of perseverance to open also in partial periodicity（Partial periodicity loses heart and brakes）, or within the cycle of non-exhaust stroke（Induction stroke, compression stroke, and expansion stroke）A small amount of perseverance is kept to open（Complete period disappointing braking）.Partial periodicity loses heart braking and the complete period loses heart braking differs primarily in that the former does not open exhaust valve in most induction stroke.
The difference of the compression-release braking of engine and type braking of losing heart mainly has at 2 points.First main distinction is the open phase for braking exhaust valve（Braking time）It is different.The complete period braking exhaust valve of disappointing type braking is opened all the time, therefore does not involve the opening time.The opening time of the braking exhaust valve of the disappointing type braking of partial periodicity is the latter half of the induction stroke in engine；And the opening time of the braking exhaust valve of compression-release braking is the latter half of the compression stroke in engine, the opening time of the braking exhaust valve of type braking more disappointing than partial periodicity is late a lot.Second main distinction is to brake the Lift of exhaust valve（Brake valve liter）It is different.In general, compression-release engine braking has bigger braking power than the braking of disappointing type, but while also produce bigger brake load, is not particularly suitable for the engine of flat tappet.Conventional valve when engine braking load ratio is lighted a fire drives load high several times, it is easy to more than the limiting value of cam contact stress.
The content of the invention：
It is an object of the invention to provide a kind of controllable engine braking apparatus of load, described this brake apparatus to solve air-leakage type engine brake device in prior art braking power is not enough and compression-release engine braking device brake load technical problem bigger than normal.
The controllable engine braking apparatus of this load of the invention, including the valve of casing, stop mechanism, oil supply mechanism, limiting mechanism of pressure, cam and an engine, it is characterised in that：A master piston bore and a slave piston bore are provided with described casing，The hydraulic channel of connection is provided between described master piston bore and slave piston bore，It is provided with a main piston master piston bore inner sliding type，It is provided with an auxiliary piston slave piston bore inner sliding type，The outer end of main piston is connected with described cam，The outer end of auxiliary piston is connected with described valve，An oilhole is provided with the casing at slave piston bore bottom，Described stop mechanism is fixed on the engine and adjacent with casing in the exit of described oilhole，Described oil supply mechanism includes oil supply gallery and unidirectional delivery valve，Described unidirectional delivery valve is arranged in oil supply gallery or is arranged between oil supply gallery and master piston bore，Described limiting mechanism of pressure includes pressure limiting valve and pressure limiting spring，Described pressure limiting valve is arranged between master piston bore and slave piston bore，Pressure limiting valve is maintained at normally open by described pressure limiting spring，Close when Fluid pressure of the pressure limiting valve in master piston bore or slave piston bore reaches predetermined value，The Fluid pressure above auxiliary piston is prevented to pass to main piston and cam by hydraulic channel.
Further，Described casing includes the valve bridge of engine，Described valve includes first valve and duaspiracle of engine，Described master piston bore is arranged on the middle part of valve bridge and upward opening，Described slave piston bore is arranged on one end of valve bridge and downwardly open，The outer end of the main piston in master piston bore is connected with one end of the rocking arm of engine，The other end of rocking arm is connected with cam，The outer end of the auxiliary piston in slave piston bore is connected with the first described valve，The downside of the other end of valve bridge is connected with described duaspiracle，Described oilhole is provided with the valve bridge at slave piston bore bottom，Described stop mechanism is fixed on the engine and adjacent with valve bridge in the exit of described oilhole，Hydraulic channel is provided with described auxiliary piston，Described pressure limiting valve is arranged on the exit of hydraulic channel in auxiliary piston，The most surfaces of pressure limiting valve bear the Fluid pressure in slave piston bore，Bear the atmospheric pressure in the external world in the fraction surface of pressure limiting valve，The two ends of described pressure limiting spring are respectively acting on pressure limiting valve and auxiliary piston，When Fluid pressure above pressure limiting valve is more than pretightning force of the pressure limiting spring on pressure limiting valve，Pressure limiting valve closes the outlet of hydraulic channel in auxiliary piston，The Fluid pressure above auxiliary piston is prevented to pass to main piston by hydraulic channel and the rocking arm that is connected with main piston and cam.
Further，Described casing includes the rocking arm of engine，Described master piston bore is arranged on one end of rocking arm and downwardly open，The other end that described slave piston bore is arranged on rocking arm is also downwardly open，The outer end of the main piston in master piston bore is connected with cam，The outer end of the auxiliary piston in slave piston bore is connected with described engine valve，Described oilhole is provided with the rocking arm at slave piston bore bottom，Described stop mechanism is fixed on the engine and adjacent with rocking arm in the exit of described oilhole，Hydraulic channel is provided with described auxiliary piston，Described pressure limiting valve is arranged on the exit of hydraulic channel in auxiliary piston，The most surfaces of pressure limiting valve bear the Fluid pressure in slave piston bore，Bear the atmospheric pressure in the external world in the fraction surface of pressure limiting valve，The two ends of described pressure limiting spring are respectively acting on pressure limiting valve and auxiliary piston，When Fluid pressure above pressure limiting valve is more than pretightning force of the pressure limiting spring on pressure limiting valve，Pressure limiting valve closes the outlet of hydraulic channel in auxiliary piston，The cam for preventing the Fluid pressure above auxiliary piston from passing to main piston by hydraulic channel and be connected with main piston.
Further, the controllable engine braking apparatus of described load also include brake clearance compensation mechanism, described brake clearance compensation mechanism includes preventing flying off spring and as foot pad, as one end of foot pad is connected for concave spherical surface and by the pressure ball face of adjustable clearance with the rocking arm of engine, as the other end of foot pad is connected with the push rod of engine, anti- one end for flying off spring is placed on rocking arm, and the anti-other end for flying off spring is placed in as in foot pad.
Present invention additionally comprises a kind of controllable engine braking methods of load，The process of main piston is delivered to including the Fluid pressure on the auxiliary piston of a prevention engine braking apparatus，Described engine braking apparatus include a casing、Stop mechanism、Oil supply mechanism、Limiting mechanism of pressure、The valve of cam and engine，A master piston bore and a slave piston bore are provided with described casing，The hydraulic channel of connection is provided between described master piston bore and slave piston bore，It is provided with described main piston master piston bore inner sliding type，It is provided with described auxiliary piston slave piston bore inner sliding type，The outer end of main piston is connected with described cam，The outer end of auxiliary piston is connected with described valve，An oilhole is provided with the casing at slave piston bore bottom，Described stop mechanism is fixed on the engine and adjacent with casing in the exit of described oilhole，Described oil supply mechanism includes oil supply gallery and unidirectional delivery valve，Described unidirectional delivery valve is arranged in oil supply gallery or is arranged between oil supply gallery and master piston bore，Described limiting mechanism of pressure includes pressure limiting valve and pressure limiting spring，It is characterized in that：Pressure limiting valve is arranged between master piston bore and slave piston bore, pressure limiting valve is maintained at into normally open by pressure limiting spring, using actuated by cams main piston, main piston drives auxiliary piston by the transmission of Fluid pressure, auxiliary piston opens the valve of engine, the valve of engine applies reaction force in auxiliary piston, Fluid pressure increase in slave piston bore, overcome pretightning force of the pressure limiting spring on pressure limiting valve, pressure limiting valve is closed, the cam for preventing the Fluid pressure above auxiliary piston from passing to main piston by hydraulic channel and be connected with main piston.
The present invention is compared with prior art, and its effect is positive and obvious.The drive mechanism of engine braking is integrated in the existing valve actuation chain of engine by the present invention（Such as valve bridge or rocking arm）Inside, and reduce valve actuation chain using stop mechanism and limiting mechanism of pressure（Such as rocking arm and cam）The brake load for undertaking, deft design, compact conformation reduces the brake load of engine, increased the braking power of engine, improves the reliability and durability of engine operation.
Description of the drawings：
Fig. 1 is the schematic diagram of the one embodiment in off-position of the controllable engine braking apparatus of load in the present invention.
Fig. 2 is the schematic diagram of the one embodiment in "ON" position of the controllable engine braking apparatus of load in the present invention.
Fig. 3 is schematic diagram of the pressure limiting valve in the present invention in one embodiment of the controllable engine braking apparatus of load in "ON" position.
Fig. 4 is schematic diagram of the pressure limiting valve in the present invention in one embodiment of the controllable engine braking apparatus of load in off-position.
Fig. 5 is the schematic diagram of second embodiment in off-position of the controllable engine braking apparatus of load in the present invention.
Fig. 6 is the schematic diagram of second embodiment in "ON" position of the controllable engine braking apparatus of load in the present invention.
Specific embodiment：
Embodiment 1:
As depicted in figs. 1 and 2, the embodiment 1 of the controllable engine braking apparatus of load of the invention is respectively at "Off"（Oil supply mechanism oil-break）And "ON"（Oil supply mechanism fuel feeding）Position.Fig. 1 and Fig. 2 include three chief components：The valve actuator 200 of engine, valve 300（Including first valve 3001 and a duaspiracle 3002）The engine braking drive mechanism 100 controllable with load.
Valve actuator 200 includes cam 230, cam follower wheel 235, push rod 201, rocking arm 210 and valve bridge 400.Valve actuator 200 and valve 300 are combined and can be described as valve actuation chain.Generally in one end of rocking arm 210（Near valve bridge 400 or near cam 230）With valve clearance governor motion.Valve clearance governor motion in the present embodiment includes the valve clearance adjusting screw 110 being arranged in the rocking arm 210 of the side of push rod 201, is fixed by lock nut 105.The swing type of rocking arm 210 ground is arranged on rocker arm shaft 205.
The valve 300 of engine includes the first valve 3001 and duaspiracle 3002, and they are respectively by valve spring 3101 and valve spring 3102（Abbreviation valve spring 310）On valve seat 320 of the overhead in engine cylinder-body 500, flowing of the gas between engine cylinder and blast pipe 600 is prevented.The mechanical movement of cam 230 is passed to the first valve 3001 and duaspiracle 3002 so as to periodically open and close by valve actuator 200 by valve bridge 400, is produced conventional（It is main）Valve motion.
The cam of engine is engine braking cam and engine routine（It is main）Integrated, the conventional boss 220 on integrated cam 230 containing at least one engine braking boss and after raising of cam.The engine braking boss of cam 230 here is included the release boss 233 and exhaust gas recirculatioon boss 232 of the compression on basic circle 225.
Engine braking drive mechanism 100 includes casing, stop mechanism, oil supply mechanism, limiting mechanism of pressure and brake clearance compensation mechanism.Casing in the present embodiment adopts the valve bridge 400 of engine.The central upward opening of valve bridge 400 is provided with a master piston bore 415, and one end of valve bridge 400 is downwardly open to be provided with a slave piston bore 190.Master piston bore 415 is connected with slave piston bore 190 by hydraulic channel 412.Main piston 162 and auxiliary piston 160 are slidably provided with respectively in master piston bore 415 and in slave piston bore 190.The upper end of main piston 162 passes through connector 113 and 114（Contain oil supply gallery in centre）It is connected with the rocking arm 210 of engine, the other end of rocking arm 210 is connected by rocker compensating gear 250, push rod 201 and cam follower wheel 235 with cam 230.The outer end of auxiliary piston 160（Below）It is connected with the first valve 3001 for producing engine braking.It is connected with the duaspiracle 3002 of engine below the other end of valve bridge 400.An oilhole 197 being in communication with the outside is provided with the valve bridge 400 at slave piston bore bottom, the valve bridge upside that oilhole 197 is located is provided with a stop mechanism 125.The casing 1251 of stop mechanism 125 is fixed on the engine.Stop mechanism 125 includes adjustable connector 1102 with connector 1142 and securing member 1052.When cam 230 is in 225 position of basic circle, connector 1142 is located on the valve bridge 400 of the top of slave piston bore 190 and closes the outlet of oilhole 197.
Alignment pin 142 is additionally provided with the side of master piston bore 415 in valve bridge 400, stopper slot 137 is provided with main piston 162, form piston limit mechanism, limit the maximum stroke of main piston 162.Similar piston limit mechanism can be used for auxiliary piston 160.
The oil supply mechanism of engine braking drive mechanism 100 supplies solenoid including braking（Do not show）, oil supply gallery and unidirectional delivery valve 172.Oil supply gallery is a lot, including the axial passage 211 in rocker arm shaft 205, radial passage 212, the groove in rocking arm 210 or the passage 115 in breach 213, passage 214 and connector 113 etc..Unidirectional delivery valve 172 is arranged in oil supply gallery or is arranged between oil supply gallery and master piston bore 415.
The rocker compensating gear 250 of engine braking drive mechanism 100 includes preventing flying off spring 198 and as foot pad 116.As one end of foot pad 116 is concave spherical surface and adjacent with the pressure ball face of the adjusting screw 110 being fixed tightly on rocking arm 210, as the other end of foot pad 116 is connected with the push rod 210 of engine, anti- one end for flying off spring 198 is placed on rocking arm 210, and the anti-other end for flying off spring 198 is placed in as in foot pad 116.The preloading spring 198 of rocker compensating gear 250 can also using different mounting means, be arranged on where difference, such as between main piston 162 and valve bridge 400 etc..Preloading spring 198 keeps the retracted position by main piston 162 in master piston bore 415（Fig. 1）With extended position（Fig. 2）In the gap 130 or 132 that valve actuation chain is internally generated, eliminate inside valve actuation chain not with amiable impact.
The limiting mechanism of pressure 170 of engine braking drive mechanism 100 is preferably shown by Fig. 3 and Fig. 4 partial enlargements.Limiting mechanism of pressure 170 includes pressure limiting valve 173 and pressure limiting spring 178.Pressure limiting valve 173 is arranged at the outlet 174 of hydraulic channel 176 in auxiliary piston 160.The most surfaces of pressure limiting valve 173 bear the Fluid pressure in slave piston bore 190, the fraction surface of pressure limiting valve 173（The cross section of valve rod 175 below）Bear the atmospheric pressure in the external world.The two ends of pressure limiting spring 178 are respectively acting on pressure limiting valve 173 and auxiliary piston 160, and pressure limiting spring 178 maintains a normally open pressure limiting valve 173.Fluid pressure above pressure limiting valve 173（Downwards）More than active force of the pressure limiting spring 178 on pressure limiting valve（Upwards）When, pressure limiting valve 173 closes the outlet 174 of hydraulic channel 176 in auxiliary piston 160, rocking arm 210 and brake cam 230 that the Fluid pressure above prevention auxiliary piston 160 is passed to main piston 162 and be connected with main piston by hydraulic channel 176 and 412.
Limiting mechanism of pressure 170 can also be arranged on other positions, as in main piston 162, but its effect is constant, when that is exactly that the Fluid pressure in slave piston bore 190 reaches predetermined value, prevents hydraulic fluid of the Fluid pressure between main piston 162 and auxiliary piston 160 on auxiliary piston 160 and be applied to main piston 162, rocking arm 210 and cam 230.
When engine braking is desired, open braking and supply solenoid（Do not show）, by the oil supply gallery of oil supply mechanism, to the fuel feeding of drive mechanism 100 of engine braking.Prevent flying off the active force of spring 198 in oil pressure counter rocker compensating gear 250, main piston 162 is set to be moved up to the bottom hole of extended position as shown in Figure 2, main piston 162 and master piston bore 415 from retracted position as shown in Figure 1 in the master piston bore 415 of valve bridge 400（Namely valve bridge 400）Between gap 130 in be filled with hydraulic fluid（Machine oil）, form hydraulic connecting.Space 132 in the rocker compensating gear 250 of Fig. 1 is eliminated.
In the latter half of the compression stroke of engine, when the engine braking boss of cam 230（Compression release boss）During 233 rising past from interior basic circle 225; rocking arm 210 drives the main piston 162 in valve bridge 400 that the retracted position of master piston bore bottom surface is down shifted to from the extended position of Fig. 2, by the hydraulic fluid of the hydraulic channel 412 and 176 between master piston bore 415 and slave piston bore 190（Machine oil）, moving downward for main piston 162 is passed to into auxiliary piston 160.Stop mechanism 125 on the valve bridge 400 of the top of slave piston bore 190, makes valve bridge 400 because the oil pressure in slave piston bore 190 increases and is adjacent to stop mechanism 125 upwards（Connector 1142）, but will not move upwards（Valve bridge 400 keeps relative static conditions）.Auxiliary piston 160 in the slave piston bore 190 of valve bridge 400 can only be extended downwardly from, and open the first valve 3001 below auxiliary piston 160, produce the valve motion of engine braking.
During above-mentioned the first valve of opening 3001 produces compression release braking, the Fluid pressure for acting on the power above auxiliary piston 162 and its surface gradually increases, and before close compression top center maximum was reached.According to above-mentioned brake load（Slave piston bore fluid pressure）The characteristics of gradually increasing, Fluid pressure of the limiting mechanism of pressure 170 in slave piston bore 190 reaches predetermined value（Determined by the bearing capacity of engine）When, its normally opened pressure limiting valve 173（Fig. 3）Under Fluid pressure effect, overcome the active force of pressure limiting spring 178, move downward, the outlet 174 of hydraulic channel 176 in auxiliary piston 160 is closed, prevents the Fluid pressure in slave piston bore 190 that rocking arm 210 and brake cam 230 above main piston 162, main piston are passed to by hydraulic channel 176 and 412.So, the brake load increasing above of braking valve 3001 is not transferred to valve actuator 200（Such as cam 230）, but by the Fluid pressure in auxiliary piston 162, slave piston bore 190 and the valve bridge 400 at the bottom of slave piston bore 190, pass to fixed stop mechanism 125 on the engine.
The top of the conventional boss 220 raised is entered in cam 230（Higher than engine braking boss 233）When, the compressing master piston bore of main piston 162 bottom drives valve bridge 400 to move downward.When valve bridge 400 and the stop mechanism 125 in face disposed thereon（That is connector 1142）During separation, the oilhole 197 communicated with slave piston bore 190 in valve bridge 400 opens emptying, extended position of the auxiliary piston 160 from the slave piston bore 190 of valve bridge 400 is moved up to retracted position, so that the lift of the first valve 3001 of the generation of conventional boss 220 raised is reset, the shut-in time almost identical with duaspiracle 3002 is produced.
If the engine braking boss of cam 230 also includes exhaust gas recirculatioon boss 232, so exhaust gas recirculatioon boss 232 opens the process of the first valve 3001 by valve actuation chain, it is essentially identical by the process that valve actuation chain opens the first valve 3001 with above-mentioned compression release boss 233, only difference is that the compression top center of the valve opening away from engine of exhaust gas recirculatioon, Fluid pressure in slave piston bore 190 is relatively much lower, and normally opened pressure limiting valve 173 is not turn off.
When engine braking is not needed, close braking and supply solenoid（Do not show）, stop to the fuel feeding of engine braking drive mechanism 100.Routine is raised in cam 230 into after integrated（It is main）The top of boss 220（Higher than braking boss 232 and 233）When, the compressing master piston bore of main piston 162 bottom drives valve bridge 400 to move downward.When valve bridge 400 and the stop mechanism 125 in face disposed thereon（That is connector 1142）During separation, the oilhole 197 communicated with slave piston bore 190 in valve bridge 400 opens emptying, and auxiliary piston 160 is moved up to retracted position from the slave piston bore 190 of valve bridge 400 from extended position.The motion at the top of conventional boss 220 after valve bridge 400 will be raised passes to two valves 3001 and 3002, produces conventional valve motion.During the top of the conventional boss 220 in cam 230 from after raising returns to interior basic circle 225 into its bottom, auxiliary piston 160 is maintained at the retracted position shown in Fig. 1（Due to the active force upwards of valve spring 3101）, main piston 162 is maintained at the retracted position shown in Fig. 1（Due to preventing flying off the active force of spring 198 in rocker compensating gear 250）, inside valve actuation chain（Adjusting screw 110 and as between foot pad 116）Form a gap 132.Due to the gap 132, engine braking boss（Such as compress release boss 233 and exhaust gas recirculatioon boss 232）Motion will not pass to valve 300, the motion at the top of conventional boss after only raising 220 passes to valve 300, produces the routine of engine（It is main）Valve motion, the running of engine braking is released from.
Embodiment 2:
As shown in Figure 5 and Figure 6, the embodiment 2 of the controllable engine braking apparatus of load of the invention is respectively at "Off"（Oil supply mechanism oil-break）And "ON"（Oil supply mechanism fuel feeding）Position.The difference of the present embodiment and above-described embodiment 1 is the rocking arm 210 that the casing in the present embodiment employs engine.That is, engine braking drive mechanism 100 is mainly integrated in rocking arm 210.Master piston bore 415 is arranged on one end of rocking arm 210 and downwardly open, and the other end that slave piston bore 190 is arranged on rocking arm 210 is also downwardly open.The outer end of the main piston 162 in master piston bore 415（Below）It is connected with cam, the outer end of the auxiliary piston 160 in slave piston bore 190（Below）It is connected with the valve 3001 of engine.Oilhole 197 is provided with the rocking arm 210 at the bottom of slave piston bore 190.Stop mechanism 125 is fixed on the engine and in the exit of described oilhole 197（Upper end）It is adjacent with rocking arm 210.Hydraulic channel 176 is provided with auxiliary piston 160, the pressure limiting valve 173 of limiting mechanism of pressure 170 is arranged at the outlet 174 of hydraulic channel 176 in auxiliary piston 160, and the most surfaces of pressure limiting valve 173 bear the Fluid pressure in slave piston bore 190, the fraction surface of pressure limiting valve（The cross section of the valve rod 175 of pressure limiting valve 173）Bear the atmospheric pressure in the external world.The two ends of pressure limiting spring 178 are respectively acting on pressure limiting valve 173 and auxiliary piston 160, when Fluid pressure above pressure limiting valve 173 is more than pretightning force of the pressure limiting spring 178 on pressure limiting valve 173, pressure limiting valve 173 closes the outlet 174 of hydraulic channel 176 in auxiliary piston 160, the cam 230 for preventing the Fluid pressure above auxiliary piston 160 from being passed to main piston 162 and be connected with main piston 162 by hydraulic channel 176 and 412.
When engine braking is desired, open braking and supply solenoid（Do not show）, by the oil supply gallery of oil supply mechanism, to the fuel feeding of drive mechanism 100 of engine braking.Prevent flying off the active force of spring 198 in oil pressure counter rocker compensating gear 250, main piston 162 is set to be moved down to the bottom hole of extended position as shown in Figure 6, main piston 162 and master piston bore 415 from retracted position as shown in Figure 5 in the master piston bore 415 of rocking arm 210（Namely rocking arm 210）Between gap 234 in be filled with machine oil, form hydraulic connecting.Space 234 in the rocker compensating gear 250 of Fig. 5 is eliminated.
In the latter half of the compression stroke of engine, when the engine braking boss of cam 230（Compression release boss）During 233 rising past from interior basic circle 225; main piston 162 in the master piston bore 415 of rocking arm 210 up shifts to the retracted position of the bottom surface of master piston bore 162 from the extended position of Fig. 6, by the fluid of the hydraulic channel 412 and 176 between master piston bore 415 and slave piston bore 190（Machine oil）, moving downward for main piston 162 is passed to into auxiliary piston 160.Stop mechanism 125 on the rocking arm 210 of the top of slave piston bore 190, makes rocking arm 210 because the oil pressure in slave piston bore 190 increases and is adjacent to stop mechanism 125 upwards（Connector 1142）, but will not move upwards（Rocking arm 210 keeps relative static conditions）.Auxiliary piston 160 in the slave piston bore 190 of rocking arm 210 can only be extended downwardly from, and open the engine valve 3001 below auxiliary piston 160, produce the valve motion of engine braking.Certainly, auxiliary piston 160 can also be connected below by a valve bridge with two valves, while opening two valves.
During above-mentioned opening valve 3001 produces compression release braking, the Fluid pressure for acting on the power above auxiliary piston 162 and its surface gradually increases, and before close compression top center maximum was reached.According to above-mentioned brake load（The fluid pressure of slave piston bore 190）The characteristics of gradually increasing, Fluid pressure of the limiting mechanism of pressure 170 in slave piston bore 190 reaches predetermined value（Determined according to the bearing capacity of engine）When, its normally opened pressure limiting valve 173（Fig. 3）Under Fluid pressure effect, the active force of pressure limiting spring 178 is overcome, move downward pressure limiting valve 173, close the outlet 174 of hydraulic channel 176 in auxiliary piston 160（Fig. 4）, prevent the Fluid pressure in slave piston bore 190 from passing to main piston 162 by hydraulic channel 176 and 412.So, the brake load increasing above of valve 3001 is not transferred to valve actuator 200 in Fig. 6（Such as cam 230）, but by the Fluid pressure in auxiliary piston 162, slave piston bore 190 and the rocking arm 210 at the bottom of slave piston bore 190, pass to fixed stop mechanism 125 on the engine.
Described above discloses a kind of controllable engine braking apparatus of new load and engine braking methods.Above-mentioned embodiment, should not be construed so as to limit the scope of the present, but used as some concrete illustrations of the present invention are represented, many other differentiation are likely to therefrom produce.For example the controllable engine braking apparatus of load, here and engine braking methods, can be used not only for push rod engine, be also applied for overhead camshaft type engine；Can be used not only for driving exhaust valve, be also applied for driving inlet valve；An engine valve can be opened during braking, it is also possible to open two engine valves.Further, delivery valve 172 can adopt different forms, such as ball valve, column valve and dish valve.Delivery valve 172 can also be placed in different positions, such as be placed in oil supply gallery（Such as the oil duct 214 in rocking arm 210）It is interior.Additionally, main piston 162 and auxiliary piston 160 can adopt different forms, such as " H " type and T-shape.Further, preloading spring 198 can have different form and where difference, such as between main piston 162 and valve bridge 400.
Additionally, the controllable engine braking apparatus of load here and engine braking methods, are suitable for a variety of engine brakings, including compression-release braking and type braking of losing heart.Here casing, in addition to the valve bridge and rocking arm of engine, can also be additional, fixed braking casing on the engine.Therefore, the scope of the present invention should not be limited by above-mentioned concrete illustration, but be determined by claim.
Claims (7)
1. a kind of controllable engine braking apparatus of load, including the valve of casing, stop mechanism, oil supply mechanism, limiting mechanism of pressure, cam and an engine, it is characterised in that：A master piston bore and a slave piston bore are provided with described casing，The hydraulic channel of connection is provided between described master piston bore and slave piston bore，It is provided with a main piston master piston bore inner sliding type，It is provided with an auxiliary piston slave piston bore inner sliding type，Transmission mechanism is set between the outer end of main piston and described cam，The outer end of auxiliary piston is connected with described valve，An oilhole is provided with the casing at slave piston bore bottom，Described stop mechanism is fixed on the engine and adjacent with casing in the exit of described oilhole，Described oil supply mechanism includes oil supply gallery and unidirectional delivery valve，Described unidirectional delivery valve is arranged in oil supply gallery or is arranged between oil supply gallery and master piston bore，Described limiting mechanism of pressure includes pressure limiting valve and pressure limiting spring，Described pressure limiting valve is arranged between master piston bore and slave piston bore，Pressure limiting valve is maintained at normally open by described pressure limiting spring，Close when Fluid pressure of the pressure limiting valve in master piston bore or slave piston bore reaches predetermined value，The Fluid pressure above auxiliary piston is prevented to pass to main piston and cam by hydraulic channel.
2. controllable engine braking apparatus of load as claimed in claim 1, it is characterised in that：Described casing includes the valve bridge of engine，Described valve includes first valve and duaspiracle of engine，Described master piston bore is arranged on the middle part of valve bridge and upward opening，Described slave piston bore is arranged on one end of valve bridge and downwardly open，The outer end of the main piston in master piston bore is connected with one end of the rocking arm of engine，The other end of rocking arm is connected with cam，The outer end of the auxiliary piston in slave piston bore is connected with the first described valve，The downside of the other end of valve bridge is connected with described duaspiracle，Described oilhole is provided with the valve bridge at slave piston bore bottom，Described stop mechanism is fixed on the engine and adjacent with valve bridge in the exit of described oilhole，Hydraulic channel is provided with described auxiliary piston，Described pressure limiting valve is arranged on the exit of hydraulic channel in auxiliary piston，The most surfaces of pressure limiting valve bear the Fluid pressure in slave piston bore，Bear the atmospheric pressure in the external world in the fraction surface of pressure limiting valve，The two ends of described pressure limiting spring are respectively acting on pressure limiting valve and auxiliary piston，When Fluid pressure above pressure limiting valve is more than pretightning force of the pressure limiting spring on pressure limiting valve，Pressure limiting valve closes the outlet of hydraulic channel in auxiliary piston，The Fluid pressure above auxiliary piston is prevented to pass to main piston by hydraulic channel and the rocking arm that is connected with main piston and cam.
3. controllable engine braking apparatus of load as claimed in claim 1, it is characterised in that：Described casing includes the rocking arm of engine，Described master piston bore is arranged on one end of rocking arm and downwardly open，The other end that described slave piston bore is arranged on rocking arm is also downwardly open，The outer end of the main piston in master piston bore is connected with cam，The outer end of the auxiliary piston in slave piston bore is connected with described engine valve，Described oilhole is provided with the rocking arm at slave piston bore bottom，Described stop mechanism is fixed on the engine and adjacent with rocking arm in the exit of described oilhole，Hydraulic channel is provided with described auxiliary piston，Described pressure limiting valve is arranged on the exit of hydraulic channel in auxiliary piston，The most surfaces of pressure limiting valve bear the Fluid pressure in slave piston bore，Bear the atmospheric pressure in the external world in the fraction surface of pressure limiting valve，The two ends of described pressure limiting spring are respectively acting on pressure limiting valve and auxiliary piston，When Fluid pressure above pressure limiting valve is more than pretightning force of the pressure limiting spring on pressure limiting valve，Pressure limiting valve closes the outlet of hydraulic channel in auxiliary piston，The cam for preventing the Fluid pressure above auxiliary piston from passing to main piston by hydraulic channel and be connected with main piston.
4. controllable engine braking apparatus of load as claimed in claim 1, it is characterised in that：Also include brake clearance compensation mechanism, described brake clearance compensation mechanism includes preventing flying off spring and as foot pad, as one end of foot pad is connected for concave spherical surface and by the pressure ball face of adjustable clearance with the rocking arm of engine, as the other end of foot pad is connected with the push rod of engine, anti- one end for flying off spring is placed on rocking arm, and the anti-other end for flying off spring is placed in as in foot pad.
5. controllable engine braking methods of a kind of load，The process of main piston is delivered to including the Fluid pressure on an auxiliary piston prevented in engine braking apparatus，Described engine braking apparatus include a casing、Stop mechanism、Oil supply mechanism、Limiting mechanism of pressure、The valve of cam and engine，A master piston bore and a slave piston bore are provided with described casing，The hydraulic channel of connection is provided between described master piston bore and slave piston bore，It is provided with described main piston master piston bore inner sliding type，It is provided with described auxiliary piston slave piston bore inner sliding type，Transmission mechanism is set between the outer end of main piston and described cam，The outer end of auxiliary piston is connected with described valve，An oilhole is provided with the casing at slave piston bore bottom，Described stop mechanism is fixed on the engine and adjacent with casing in the exit of described oilhole，Described oil supply mechanism includes oil supply gallery and unidirectional delivery valve，Described unidirectional delivery valve is arranged in oil supply gallery or is arranged between oil supply gallery and master piston bore，Described limiting mechanism of pressure includes pressure limiting valve and pressure limiting spring，It is characterized in that：Pressure limiting valve is arranged between master piston bore and slave piston bore, pressure limiting valve is maintained at into normally open by pressure limiting spring, using actuated by cams main piston, main piston drives auxiliary piston by the transmission of Fluid pressure, auxiliary piston opens the valve of engine, the valve of engine applies reaction force in auxiliary piston, Fluid pressure increase in slave piston bore, overcome pretightning force of the pressure limiting spring on pressure limiting valve, pressure limiting valve is closed, the cam for preventing the Fluid pressure above auxiliary piston from passing to main piston by hydraulic channel and be connected with main piston.
6. controllable engine braking methods of load as claimed in claim 5, it is characterised in that：Described casing includes the valve bridge of engine, described valve includes first valve and duaspiracle of engine, described master piston bore is arranged on the middle part of valve bridge and upward opening, described slave piston bore is arranged on one end of valve bridge and downwardly open, the outer end of the main piston in master piston bore is connected with one end of the rocking arm of engine, the other end of rocking arm is connected with cam, the outer end of the auxiliary piston in slave piston bore is connected with the first described valve, the downside of the other end of valve bridge is connected with described duaspiracle, described oilhole is provided with the valve bridge at slave piston bore bottom, described stop mechanism is fixed on the engine and adjacent with valve bridge in the exit of described oilhole, hydraulic channel is provided with described auxiliary piston, the controllable engine braking methods of described load include：Pressure limiting valve is arranged on into the exit of hydraulic channel in auxiliary piston, so that the most surfaces of pressure limiting valve bear the Fluid pressure in slave piston bore, the fraction surface of pressure limiting valve is allowed to bear extraneous atmospheric pressure, pressure limiting valve is maintained a normally open by pressure limiting spring, using actuated by cams main piston, main piston drives auxiliary piston by hydraulic pressure transfer, Fluid pressure above increase pressure limiting valve, overcome pretightning force of the pressure limiting spring on pressure limiting valve, close the outlet of hydraulic channel in pressure limiting valve and auxiliary piston, the Fluid pressure on auxiliary piston is prevented to pass to main piston by hydraulic channel and the rocking arm that is connected with main piston and cam.
7. controllable engine braking methods of load as claimed in claim 5, it is characterised in that：Described casing includes the rocking arm of engine, described master piston bore is arranged on one end of rocking arm and downwardly open, the other end that described slave piston bore is arranged on rocking arm is also downwardly open, the outer end of the main piston in master piston bore is connected with cam, the outer end of the auxiliary piston in slave piston bore is connected with described engine valve, described oilhole is provided with the rocking arm at slave piston bore bottom, described stop mechanism is fixed on the engine and adjacent with rocking arm in the exit of described oilhole, hydraulic channel is provided with described auxiliary piston, the controllable engine braking methods of described load include：Pressure limiting valve is arranged on into the exit of hydraulic channel in auxiliary piston, so that the most surfaces of pressure limiting valve bear the Fluid pressure in slave piston bore, the fraction surface of pressure limiting valve is allowed to bear extraneous atmospheric pressure, pressure limiting valve is maintained a normally open by pressure limiting spring, using actuated by cams main piston, main piston drives auxiliary piston by hydraulic pressure transfer, Fluid pressure above increase pressure limiting valve, overcome pretightning force of the pressure limiting spring on pressure limiting valve, close the outlet of hydraulic channel in pressure limiting valve and auxiliary piston, the cam for preventing the Fluid pressure on auxiliary piston from passing to main piston by hydraulic channel and be connected with main piston.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510724228X | 2015-10-29 | ||
| CN201510724228 | 2015-10-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106640257A true CN106640257A (en) | 2017-05-10 |
| CN106640257B CN106640257B (en) | 2019-09-27 |
Family
ID=58850876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510848761.7A Active CN106640257B (en) | 2015-10-29 | 2015-11-27 | Load controllable engine braking apparatus and engine braking methods |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106640257B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111386387A (en) * | 2017-11-10 | 2020-07-07 | 雅各布斯车辆系统公司 | Clearance adjustment in a lost motion engine system |
| CN112177702A (en) * | 2020-12-02 | 2021-01-05 | 江苏卓联精密机械有限公司 | Self-resetting single-valve double-piston hydraulic driving device and method for overhead cam engine |
| CN112177703A (en) * | 2020-12-02 | 2021-01-05 | 江苏卓联精密机械有限公司 | Self-resetting single-valve main and auxiliary piston hydraulic driving device and method for push rod engine |
| CN114109551A (en) * | 2022-01-25 | 2022-03-01 | 江苏卓联精密机械有限公司 | Special driving cam combined type valve driving device for hydraulic clearance self-adjustment |
| US11377980B2 (en) | 2020-12-02 | 2022-07-05 | Jiangsu Jointek Precision Machinery Co., Ltd | Self-resetting single-valve double-piston hydraulic drive device and method for overhead cam engine |
| CN114729582A (en) * | 2019-11-21 | 2022-07-08 | Pac制动公司 | Independent compression brake control module for compression release brake system of internal combustion engine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102559A (en) * | 2011-03-10 | 2011-06-22 | 奚勇 | Compression releasing engine braking method and device |
| CN202090976U (en) * | 2011-05-18 | 2011-12-28 | 上海尤顺汽车部件有限公司 | Rocker arm brake apparatus with major and minor pistons |
| US20120298057A1 (en) * | 2011-05-26 | 2012-11-29 | Jacobs Vehicle Systems, Inc. | Primary and auxiliary rocker arm assembly for engine valve actuation |
| CN203097984U (en) * | 2012-11-26 | 2013-07-31 | 上海尤顺汽车部件有限公司 | Device for generating independently optimizable auxiliary valve movement of engine |
| CN103696822A (en) * | 2013-12-23 | 2014-04-02 | 江苏公大动力技术有限公司 | Driver with hydraulic tappet |
| US20140144400A1 (en) * | 2011-07-22 | 2014-05-29 | Renault Trucks | Valve actuation mechanism and automotive vehicle comprising such a valve actuation mechanism |
-
2015
- 2015-11-27 CN CN201510848761.7A patent/CN106640257B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102559A (en) * | 2011-03-10 | 2011-06-22 | 奚勇 | Compression releasing engine braking method and device |
| CN202090976U (en) * | 2011-05-18 | 2011-12-28 | 上海尤顺汽车部件有限公司 | Rocker arm brake apparatus with major and minor pistons |
| US20120298057A1 (en) * | 2011-05-26 | 2012-11-29 | Jacobs Vehicle Systems, Inc. | Primary and auxiliary rocker arm assembly for engine valve actuation |
| US20140144400A1 (en) * | 2011-07-22 | 2014-05-29 | Renault Trucks | Valve actuation mechanism and automotive vehicle comprising such a valve actuation mechanism |
| CN203097984U (en) * | 2012-11-26 | 2013-07-31 | 上海尤顺汽车部件有限公司 | Device for generating independently optimizable auxiliary valve movement of engine |
| CN103696822A (en) * | 2013-12-23 | 2014-04-02 | 江苏公大动力技术有限公司 | Driver with hydraulic tappet |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111386387A (en) * | 2017-11-10 | 2020-07-07 | 雅各布斯车辆系统公司 | Clearance adjustment in a lost motion engine system |
| CN111386387B (en) * | 2017-11-10 | 2022-02-18 | 雅各布斯车辆系统公司 | Clearance adjustment in a lost motion engine system |
| 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 |
| CN114729582B (en) * | 2019-11-21 | 2024-04-09 | Pac制动公司 | Independent compression brake control module for compression release brake system of internal combustion engine |
| CN114729582A (en) * | 2019-11-21 | 2022-07-08 | Pac制动公司 | Independent compression brake control module for compression release brake system of internal combustion engine |
| US11377980B2 (en) | 2020-12-02 | 2022-07-05 | Jiangsu Jointek Precision Machinery Co., Ltd | Self-resetting single-valve double-piston hydraulic drive device and method for overhead cam engine |
| WO2022116376A1 (en) * | 2020-12-02 | 2022-06-09 | 江苏卓联精密机械有限公司 | Self-resetting, single-valve, double-piston hydraulic drive device and method for overhead cam engine |
| CN112177702B (en) * | 2020-12-02 | 2021-03-12 | 江苏卓联精密机械有限公司 | Self-resetting single-valve double-piston hydraulic driving device and method for overhead cam engine |
| CN112177703A (en) * | 2020-12-02 | 2021-01-05 | 江苏卓联精密机械有限公司 | Self-resetting single-valve main and auxiliary piston hydraulic driving device and method for push rod engine |
| CN112177702A (en) * | 2020-12-02 | 2021-01-05 | 江苏卓联精密机械有限公司 | Self-resetting single-valve double-piston hydraulic driving device and method for overhead cam engine |
| CN114109551B (en) * | 2022-01-25 | 2022-04-26 | 江苏卓联精密机械有限公司 | Special driving cam combined type valve driving device for hydraulic clearance self-adjustment |
| CN114109551A (en) * | 2022-01-25 | 2022-03-01 | 江苏卓联精密机械有限公司 | Special driving cam combined type valve driving device for hydraulic clearance self-adjustment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106640257B (en) | 2019-09-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106640257A (en) | Load-controllable engine braking device and engine braking method | |
| CN106150589B (en) | A kind of list valve compression-release valve bridge brake apparatus and method | |
| EP3653851B1 (en) | Linkage between an auxiliary motion source and a main motion load path in an internal combustion engine | |
| CN102787919B (en) | Method and device for braking reset rocking arm | |
| CN102102559B (en) | Compression releasing engine braking method and device | |
| CN102588030B (en) | The auxiliary valve driving mechanism of electromotor | |
| KR101552487B1 (en) | Method and system for single exhaust valve bridge brake | |
| US6253730B1 (en) | Engine compression braking system with integral rocker lever and reset valve | |
| CN101392667B (en) | Engine braking apparatus and method using single valve and bridge of valve | |
| US8516984B2 (en) | Lost motion variable valve actuation system with valve catch piston | |
| CN202140128U (en) | Integrated air-leakage type engine brake device | |
| WO2012174697A1 (en) | Fixed chain type composite rocker arm brake device | |
| CN102650224A (en) | Braking method and device of integrated exhaust type engine | |
| CN202017536U (en) | Device for braking engine by using valve bridge | |
| CN205089460U (en) | Compression release type engine brake device | |
| CN106968753B (en) | Brake actuating mechanism for engine brake oil way and use method thereof | |
| CN103912336A (en) | Single valve opened engine auxiliary valve actuator | |
| CN202090975U (en) | Engine brake device positioned by valve rod of air valve | |
| US6293238B1 (en) | Rocker arm and rocker arm assembly for engines | |
| CN102733884B (en) | A kind of engine braking apparatus of integrated form | |
| CN102678345A (en) | Method and device for braking engine by using valve bridge | |
| CN203335158U (en) | Fixedly-hinged type engine variable valve driving mechanism | |
| CN202090977U (en) | Reset type rocker braking device | |
| CN103388504B (en) | A kind of solid chain type dedicated rocker arm braking device | |
| CN102691542B (en) | A kind of engine braking apparatus of being located by valve stem |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 201415 No. 1133 Juting Road, Fengxian District, Shanghai Patentee after: Shanghai Youshun Automobile Technology Co.,Ltd. Address before: 201415 No. 1133 Juting Road, Fengxian District, Shanghai Patentee before: Shanghai Universoon Autoparts Co.,Ltd. |