CN201924986U - Special valve driving mechanism for engine brake - Google Patents
Special valve driving mechanism for engine brake Download PDFInfo
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- CN201924986U CN201924986U CN2011200021616U CN201120002161U CN201924986U CN 201924986 U CN201924986 U CN 201924986U CN 2011200021616 U CN2011200021616 U CN 2011200021616U CN 201120002161 U CN201120002161 U CN 201120002161U CN 201924986 U CN201924986 U CN 201924986U
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Abstract
The utility model relates to a special valve driving mechanism for engine brake, which comprises a brake cam, a brake rocker arm shaft, a brake rocker arm, an eccentric rocker arm shaft sleeve and a shaft sleeve driving device. The eccentric rocker arm shaft sleeve is arranged in a shaft hole of the brake rocker arm. The brake rocker arm shaft is eccentrically arranged in the eccentric rocker arm shaft sleeve. A kinematic pair is formed by one end of the brake rocker arm and the brake cam. The shaft sleeve driving device drives the eccentric rocker arm shaft sleeve to rotate between the non-operation position and the operation position. The utility model provides the special valve driving mechanism for engine brake, which is independent of the common valve driving mechanism. In the braking process, the valve lift of a common valve is not increased, so that mutual influence between the ignition operation and the braking operation of an engine is avoided, the braking power is improved, the temperature of an oil spraying nozzle is reduced, the wear to valve parts is reduced, and the reliability and the durability of the engine are improved. The special brake cam and a special brake rocker arm braking device have the advantages of superior performance, simple structure, low cost, reliability, durability and the like and are convenient to install.
Description
Technical field:
The utility model relates to mechanical field, relates in particular to vehicle motor, and particularly the valve actuation technology of vehicle motor specifically is a kind of valve actuating mechanism of engine braking special use.
Background technique:
In the prior art, the method for the conventional valve actuation of vehicle motor is behaved and is known altogether, and it uses the history in existing more than 100 year.But owing to the extra demand to engine emission and engine braking, increasing motor need increase the braking valve motion, as be used for the valve motion of exhaust gas recirculation and the valve motion of engine braking on the basis of conventional valve motion.Wherein, engine brake has become the device that heavy-duty commercial vehicle engine must be joined gradually.
The engine braking technology is widely known by the people.Only need motor temporarily is converted to compressor.Cut off fuel oil in the transfer process, when the approaching end of engine piston compression stroke, open exhaust valve, allowing to be compressed gas (being air during braking) is released, the motor energy that pressurized gas absorbed in compression stroke, can not turn back to engine piston at expansion stroke subsequently, but dissipate by the exhaust and the radiation system of motor.Final result is effective engine braking, slows down the speed of vehicle.
Engine braking has many different types.Generally, the engine braking running is to add the braking valve motion that is used for engine braking outside the conventional valve motion of motor.How to produce according to this braking valve motion, engine braking can be defined as:
1.I h type engine h braking: the braking valve motion is introduced from the existing contiguous cam of motor, produces so-called " all can " and (Jake) brakes;
2.II h type engine h braking: the braking valve motion is by changing existing cam curve, produce motion and lose the h type engine h braking, braking as the integrated form rocking arm;
3.III h type engine h braking: the braking valve motion comes from special-purpose brake cam, by special-purpose brake rocker arm, produces special-purpose braking valve motion;
4.IV h type engine h braking: the braking valve motion is that the valve motion by direct change available engine obtains, and produces the h type engine h braking of losing heart usually; And
5.V h type engine h braking: the braking valve motion is used special valve system, generates a special valve (the 5th valve) engine braking.
A precedent of engine braking apparatus is that the U.S. Patent number 3220392 that was provided in 1962 by comings (Cummins) discloses, according to the braking system of this patent manufacturing commercial very successful.But, this type of engine braking system is the annex of overhead on motor.For this type of device is installed, between cylinder and valve gap, to add packing ring, therefore, increased height, weight and the cost of motor extraly.
Above-mentioned engine braking system passes to the outlet valve that will open through oil hydraulic circuit with the machinery input.Be usually included in reciprocating main piston in the master piston bore on the oil hydraulic circuit, this to-and-fro motion comes from the machinery input of motor, such as the shaking of oil sprayer rocking arm, the hydraulic fluid that moves through of main piston passes to sub-piston on the oil hydraulic circuit, make its to-and-fro motion in slave piston bore, sub-piston acts on the outlet valve directly or indirectly, produces the valve actuation of engine braking running.
There is another shortcoming by hydraulically powered conventional engines braking system, be the contractibility or the distortion of hydraulic system, this flexibility with fluid is relevant, a large amount of compressions that high flexibility causes brake valve to rise reduce, valve rises reduces the increase that causes valve to carry, and the increase that valve carries causes higher flexibility, causes a kind of vicious circle.In addition, the valve liter that is caused by hydraulic pressure distortion reduces to increase along with the increase of engine speed, and to rise trend on the contrary with the desired brake valve of engine braking performance.In order to reduce flexible hydraulic, must use large diameter hydraulic piston, increase volume and weight.And oily stream need make enlarged bore piston stretch out for a long time or withdraw, and causes that braking system inertia is big, reaction is slow.
The earliest engine braking system is integrated in the existing parts of motor be the U.S. Anderson (Jonsson) in nineteen sixty-eight at No. 3367312 disclosed a kind of integrated form compression-release engine braking system of U. S. Patent.This braking system is lost type (lost motion) engine braking for motion, need make amendment to the conventional cam of motor.Except the conventional boss with the power running strengthens, also increased the braking boss that is used for engine braking on the same cam.The rocking arm of this braking system is installed on the eccentric cylinder of pitman arm shaft, by rotating pitman arm shaft, changes the central position of shaking of rocking arm, thereby produces or eliminate the gap of " losing motion " between cam and valve.When the gap formed, the motion of braking boss was lost on the cam, and motor only produces the power running; When eliminated in the gap, the motion of all boss on the cam (conventional boss after the increasing and braking boss) all was delivered to valve, produces the braking valve motion of engine braking running.
The braking system of Anderson is rotated an eccentric pitman arm shaft, changes the central position of shaking of all rocking arms simultaneously, need overcome the active force of a lot of valve spring on rocking arm, has caused very big hydraulic driving system.Another shortcoming of the braking system of Anderson comes from the conventional boss that strengthened and produce the conventional valve lift curve that has strengthened when engine braking, has reduced braking force, has increased the temperature of oil nozzle.
U. S. Patent No. 5335636 (1994) discloses another integrated form rocking arm braking system.This braking system also needs the conventional cam of motor is made amendment.Except the conventional boss with the power running strengthens, also increased the braking shoulder that is used for engine braking on the same cam.The braking shoulder is the molded lines of level altitude (permanent high), and the type braking that can only be used for losing heart can not be used for the compression-release braking.In addition, the rocking arm of this braking system is installed on the excentric sleeve, and excentric sleeve is installed on the pitman arm shaft again.By the eccentric rotation axis cover, change the central position of shaking of rocking arm, thereby between cam and valve, produce or eliminate the gap of " losing motion ".When the gap formed, the motion of braking shoulder was lost on the cam, and motor only produces the power running; When eliminated in the gap, the motion of all boss of cam (conventional boss after the increasing and braking shoulder) all was delivered to valve, produces the braking valve motion of engine braking running.Also have, the rocking arm of this braking system acts on the air valve bridge, opens two valve brakings simultaneously.
Above-mentioned integrated form rocking arm braking system still needs to strengthen conventional boss, and conventional valve lift strengthens when causing engine braking, and braking force descends, and the oil nozzle temperature raises.In addition, above-mentioned integrated form rocking arm braking system can only be used for disappointing type braking, can not be used for the compression-release braking.The braking ability of the type that loses heart braking is braked far below compression-release.Also have, open the dual valve braking and cause whole valve actuating mechanism to bear double brake load, increase wearing and tearing, reduce reliability and durability.
U. S. Patent No. 5647319 (1997) discloses another and has adopted the integrated form rocking arm braking system of excentric sleeve.This braking system also is that brake valve is upgraded to permanent high disappointing type braking, but it has two kinds of different brake valve liters.When engine low rotation speed (below 2000 rev/mins), use little brake valve liter; When the high rotating speed of motor (more than 2000 rev/mins), use big brake valve liter.In addition, the igniting of motor running and the shared same cam of braking running in all integrated form rocking arm braking system, need to revise the existing conventional boss, the influencing each other of cause lighting a fire running and braking running, braking force descends, the oil nozzle temperature raises, the wearing and tearing of valve based part increase and the reliability and the durability of motor reduce.
Summary of the invention:
The purpose of this utility model is to provide a kind of valve actuating mechanism of engine braking special use, the valve actuating mechanism of described this engine braking special use will solve in the prior art integrated form rocking arm braking system need revise the existing conventional cam, and the running and the braking running influences each other, braking force descends, the oil nozzle temperature raises, the wearing and tearing of valve based part increase and the reliability of motor and technical problem that durability reduces of causing lighting a fire also will solve height, weight and cost techniques problem that traditional engine braking apparatus increases motor simultaneously.
The valve actuating mechanism of this engine braking special use of the present utility model, be used to produce the valve motion of engine braking, described motor comprises a conventional valve actuating mechanism, described conventional valve actuating mechanism comprises conventional cam, conventional pitman arm shaft, conventional rocking arm and valve, the described conventional rocking arm that moves through of described conventional cam passes to described valve to produce the conventional valve motion of motor, wherein, the special-purpose valve actuating mechanism of described engine braking comprises brake cam, the brake rocker arm axle, brake rocker arm, eccentric swing arm sleeve and axle sleeve drive unit, described eccentric swing arm sleeve is arranged in the axis hole of described brake rocker arm, described brake rocker arm axle is arranged in the eccentric swing arm sleeve, the axle center of brake rocker arm axle and the biasing of the axle center of eccentric swing arm sleeve, one end of brake rocker arm and described brake cam constitute kinematic pair, the other end of brake rocker arm is positioned at the top of described valve, described axle sleeve drive unit drives eccentric swing arm sleeve and rotates between off position and operating position, at described off position, brake rocker arm shake center line away from valve, brake rocker arm separates with valve, at described operating position, brake rocker arm shake center line near valve, brake rocker arm contacts with valve, the transmission of movement of brake cam is given valve, produces the valve motion of engine braking.
Further, have phase difference between the open phase in open phase in the described braking valve motion and the described conventional valve motion, the valve of braking valve motion rises the valve liter less than conventional valve motion.
Further, described brake rocker arm axle and described conventional pitman arm shaft are same pitman arm shaft, and described brake rocker arm and conventional rocking arm are installed on the described pitman arm shaft abreast.
Further, described axle sleeve drive unit is the internally-arranged type driving mechanism, it is interior and adjacent with eccentric swing arm sleeve that the axle sleeve drive unit is arranged on brake rocker arm, described internally-arranged type driving mechanism comprises driven plunger, and the eccentric swing arm sleeve of described driving driving alive rotates between off position and operating position.
Further, described axle sleeve drive unit is the externally-arranged type driving mechanism, described externally-arranged type driving mechanism comprises actuator, and described actuator is positioned at outside the described brake rocker arm, and actuator drives eccentric swing arm sleeve and rotates between off position and operating position.
Further, described axle sleeve drive unit is a continuously variable driving mechanism, and described continuously variable driving mechanism drives described eccentric swing arm sleeve, and the operating position of described eccentric swing arm sleeve is adjustable continuously.
Further, comprise brake spring in the special-purpose valve actuating mechanism of described engine braking, described brake spring is biased in described brake rocker arm the position of avoiding impacting valve.
Working principle of the present utility model is: when the braking valve motion that needs motor when producing engine braking, the braking control mechanism of motor is open-minded, to the special-purpose valve actuating mechanism fuel feeding of engine braking.Oil pressure promotes the axle sleeve drive unit, and the axle sleeve drive unit drives eccentric swing arm sleeve and forwards operating position to from off position.Brake rocker arm shake center line (down) near valve, eliminated the gap between brake cam and the valve, brake rocker arm links to each other with valve.The transmission of movement of brake cam is given valve, produces the valve motion of engine braking.When not needing engine braking, the braking control mechanism of motor cuts out emptying, and the axle sleeve drive unit of the special-purpose valve actuating mechanism of engine braking is moved back into off position with eccentric swing arm sleeve from operating position.Brake rocker arm shake center line (up) away from valve, formed the gap between brake cam and the valve, brake rocker arm separates with valve.The motion of brake cam can not pass to valve, and motor breaks away from the braking running, gets back to routine (igniting) state.
The utility model and prior art are compared, and its effect is actively with tangible.The utility model provides the independently special-purpose valve actuating mechanism of engine braking of a kind of and existing conventional valve actuating mechanism, comprise special-purpose brake cam and special-purpose brake rocker arm, can not need to revise the existing conventional cam, do not increase the valve liter of conventional valve during braking, avoid influencing each other between engine ignition running and the braking running, increased braking force, reduced the oil nozzle temperature, reduce the wearing and tearing of valve based part, improved the reliability and the durability of motor.Special-purpose brake cam of the present utility model and special-purpose brake rocker arm braking device have superior performance, advantage such as simple in structure, easy for installation, with low cost and reliability and durability.
Description of drawings:
Fig. 1 is an embodiment's the schematic representation of the valve actuating mechanism of engine braking special use of the present utility model.
Fig. 2 is another embodiment's the schematic representation of the valve actuating mechanism of engine braking special use of the present utility model.
Fig. 3 is the schematic representation of an arrangement position relation of brake rocker arm in the valve actuating mechanism of engine braking special use of the present utility model and conventional rocking arm.
Fig. 4 is the schematic representation of conventional valve motion curve and braking valve motion curve among the embodiment of valve actuating mechanism of engine braking special use of the present utility model.
Embodiment:
Embodiment 1:
As Fig. 1, Fig. 3 and shown in Figure 4, the valve motion that the special-purpose valve actuating mechanism of the engine braking of present embodiment is produced is the exhaust valve motion that engine braking is used.The conventional valve motion that is used for motor routine (igniting) running is produced by conventional valve actuating mechanism 200.The special-purpose valve actuating mechanism 2002 of conventional valve actuating mechanism 200 and engine braking is two separate mechanisms.
Conventional valve actuating mechanism 200 has a lot of parts, comprise conventional cam 230, cam follower wheel 235, conventional rocking arm 210, air valve bridge (also being the valve bridge) 400 and exhaust valve 300, exhaust valve 300 constitutes by 3001 and 3002, and exhaust valve 300 is biased on the valve seat 320 of engine cylinder-body 500 by the valve spring 3101 and 3102 of motor, and control gaseous flows between engine cylinder (not shown) and outlet pipe 600.Conventional rocking arm 210 is installed on the conventional pitman arm shaft 205 rock typely, with the motion of conventional cam 230, passes to exhaust valve 300, and it is is periodically opened and closed.Conventional valve actuating mechanism 200 also comprises valve clearance adjusting screw 110 and resembles foot pad 114.Valve clearance adjusting screw 110 is fixed tightly on the conventional rocking arm 210 by nut 105.Conventional cam 230 has a conventional boss 220 at interior basic circle more than 225, produce conventional valve lift curve (see Fig. 4 2202), and the routine (igniting) that is used for motor operates.
The special-purpose valve actuating mechanism 2002 of engine braking comprises brake cam 2302 (originally execute and be special-purpose brake cam in the example), brake cam follower 2352, brake rocker arm axle 2052, brake rocker arm 2102 (originally execute and be special-purpose brake rocker arm in the example), eccentric swing arm sleeve 188 and axle sleeve drive unit 100.Eccentric swing arm sleeve 188 is between brake rocker arm axle 2052 and special-purpose brake rocker arm 2102.The projection 142 (this projection also can be a pin that is assemblied in addition on the excentric sleeve) that one pin shape is arranged on the eccentric swing arm sleeve 188 places in the grooving 137 of special-purpose brake rocker arm 2102 centres.One end of special-purpose brake rocker arm 2102 links to each other with special-purpose brake cam 2302 by brake cam follower 2352, and the other end of special-purpose brake rocker arm 2102 is positioned on the exhaust valve 3001.Be positioned at braking briquetting 116 on valve bridge 400, the exhaust valve 3001 in the present embodiment for selecting piece installing, that is to say, special-purpose brake rocker arm 2102 can act directly on valve bridge 400 or exhaust valve 3001 and extend on the valve rod.The special-purpose valve actuating mechanism 2002 of engine braking also comprises braking valve clearance adjusting screw 1102 and resembles foot pad 1142.Braking valve clearance adjusting screw 1102 is fixed tightly on the special-purpose brake rocker arm 2102 by nut 1052.Special-purpose brake rocker arm 2102 is biased on the special-purpose brake cam 2302 by brake spring 198 usually, makes can not produce any impact between special-purpose brake rocker arm 2102 and the exhaust valve 3001.
Special-purpose brake cam 2302 has special- purpose braking boss 232 and 233 at interior basic circle more than 2252,232 are used to produce the compression release of valve, 233 are used to produce the exhaust gas recirculatioon of exhaust valve, the 232 and 233 braking valve lift curves that are used to produce engine braking (see Fig. 4 2322 and 2332).Exhaust gas recirculatioon braking boss 233 is to select piece installing in the present embodiment.
The axle sleeve drive unit 100 of the special-purpose valve actuating mechanism 2002 of engine braking be a hydraulic driving system, comprise brake the control mechanism (not shown), be positioned at special-purpose brake rocker arm 2102 piston hole 260 driven plunger 164 and be communicated with both fluid network.Fluid network comprises fluid passage 213 in axial fluid passage 211 in the brake rocker arm axle 2052 and radial fluid passages 212, the eccentric swing arm sleeve 188 and the fluid passage 214 in the special-purpose brake rocker arm 2102.One annular groove 226 is arranged on the driven plunger 164.Annular groove 226 forms kinematic pair with projection 142 on the axle sleeve 188, and the translation of driven plunger 164 is converted to the rotation of eccentric swing arm sleeve 188 on brake rocker arm axle 2052.Driven plunger 164 is usually by spring 156 biasings downward (Fig. 1), eccentric swing arm sleeve 188 is in off position (eccentric swing arm sleeve 188 thinnest parts are positioned at the lowest part of brake rocker arm axle 2052), special-purpose brake rocker arm 2102 shake centerline in the highest position, special-purpose brake rocker arm 2102 is away from exhaust valve 3001 (or exhaust valve 3001 open direction).Form a gap 132 between special-purpose brake cam 2302 and the exhaust valve 3001, special-purpose motion of braking boss 232 and 233 can not pass to exhaust valve 3001.Whole engine braking mechanism separates with the normal operation of motor.
When the braking valve motion that needs motor, when just needing engine braking, the braking control mechanism of motor is open-minded, to the special-purpose valve actuating mechanism fuel feeding of engine braking.Machine oil comprises fluid passage 211,212,213 and 214 by fluid network, flows to driven plunger 164.Oil pressure overcomes the active force of spring 156, and driven plunger 164 is upwards released in piston hole 260.Annular groove 226 on the driven plunger 164 drives eccentric swing arm sleeve 188 by projection 142 and forward operating position (wall thickness of eccentric swing arm sleeve 188 that is positioned at the lowest part of brake rocker arm axle 2052 strengthens) to from the off position of Fig. 1 on fixed brake rocker arm axle 2052.Special-purpose brake rocker arm 2102 shake center line (down) near exhaust valve 3001 (or exhaust valve 3001 open direction), eliminated the gap 132 between special-purpose brake cam 2302 and the exhaust valve 3001, special-purpose brake rocker arm 2102 links to each other with exhaust valve 3001.The special-purpose transmission of movement supply and exhaust door 3001 of braking boss 232 and 233, the braking valve motion of generation engine braking.
When not needing engine braking, the braking control mechanism of motor cuts out emptying, and spring 156 pushes driven plunger 164 downwards in the piston hole 260.Annular groove 226 on the driven plunger 164 drives eccentric swing arm sleeve 188 by projection 142 and is moved back into off position shown in Figure 1 from operating position.Special-purpose brake rocker arm 2102 shake center line (up) away from exhaust valve 3001, formed the gap 132 between special-purpose brake cam 2302 and the exhaust valve 3001, special-purpose brake cam 2302 separates with exhaust valve 3001.The motion of special-purpose brake cam 2302 can not pass to exhaust valve 3001, and motor breaks away from the braking running, gets back to routine (igniting) state.
Fig. 3 is the schematic representation of a kind of Rankine-Hugoniot relations between brake rocker arm and the conventional rocking arm.The brake rocker arm axle 2052 of the braking exhaust valve driving mechanism 2002 among Fig. 1 and Fig. 2 and the conventional pitman arm shaft 205 of the conventional exhaust valve driving mechanism 200 among Fig. 1 are same pitman arm shaft.At this moment, brake rocker arm 2102 and conventional rocking arm 210 can be installed on the conventional pitman arm shaft 205 abreast, form position relation as shown in Figure 3.
Certainly, other arrangement position (about, up and down with inside and outside etc.) also is possible.
Fig. 4 is the special-purpose valve actuating mechanism embodiment's of the engine braking of the present utility model conventional valve motion curve 2202 and the schematic representation of braking valve motion curve 2322 and 2332.Among conventional valve motion curve 2202 and Fig. 1 in the conventional cam 230 the conventional boss 220 on the basic circles 225 corresponding, by conventional valve actuating mechanism 200 generations.Braking valve motion (engine braking valve motion) curve 2322 with 2332 with Fig. 1 in the special-purpose brake cam 2302 special use on the basic circles 2252 to brake boss 232 and 233 corresponding, produce by special-purpose brake rocker arm 2102.
Conventional valve motion curve 2202 is what to separate with braking valve motion curve 2322 and 2332 among Fig. 4, and the open phase of two kinds of motions staggers.When the special-purpose brake rocker arm 2102 of special-purpose brake cam 2302 promotions moved, conventional rocking arm 210 was actionless.Brake the valve liter (open amount) of the valve liter (amount of opening) of valve motion curve 2322 and 2332 less than conventional valve motion curve 2202.Integrated form rocking arm braking system can strengthen conventional valve motion curve (cycle and the amount of holding) in the prior art when braking, causes the power of engine braking to descend, and the oil nozzle temperature raises.Because braking exhaust valve driving mechanism 2002 of the present utility model and conventional exhaust valve driving mechanism 200 are two separate mechanisms, so the utility model the time can not strengthen conventional valve motion curve 2202 (cycle and the amount of holding) in braking, has identical conventional valve motion curve 2202 when operating with motor routine (igniting) during the engine braking running.Therefore, the utility model has been eliminated the braking force decline of integrated form rocking arm braking system in the prior art, the shortcoming that the oil nozzle temperature raises.
Embodiment 2:
Fig. 2 is the embodiment's two of the special-purpose valve actuating mechanism of an engine braking of the present utility model schematic representation.The difference of present embodiment and the foregoing description one is axle sleeve drive unit 100.Embodiment one axle sleeve drive unit 100 is an internally-arranged type.Driven plunger 164 is positioned within brake rocker arm (the special-purpose brake rocker arm) 2102 (Fig. 1).The axle sleeve drive unit 100 of present embodiment is an externally-arranged type.Have swing arm 1422 (Fig. 2) on the eccentric swing arm sleeve 188, cotter way 139 is arranged on the swing arm 1422.Be positioned at actuator (herein for driveshaft) 1642 the pin 141 of the axle sleeve drive unit 100 outside the brake rocker arm (special-purpose brake rocker arm) 2102, eccentric swing arm sleeve 188 is rotated between off position and operating position by being positioned at cotter way 139.Driveshaft 1642 can be the extension of driven plunger, also can be other actuator, as driving lead.Axle sleeve drive unit 100 can adopt different forms, from the simplest manual bicycle brake lead driving mechanism, to the automatic continuous variable driving mechanism; It can be the combination of mechanical, hydraulic type, electromagnetic type or several forms.When axle sleeve drive unit 100 adopted the driving mechanism of continuous variable, the amounts of rotation of eccentric swing arm sleeve 188 (operating position) was continuously adjustable, and the lift of engine exhaust port (aperture) also is continuously adjustable.When engine braking, the brake valve liter can be regulated according to the rotating speed of motor and the size of brake load etc. like this, optimizes braking ability.
Because conventional exhaust valve driving mechanism 200 of the present utility model (Fig. 1) and braking exhaust valve driving mechanism 2002 (Fig. 1 and Fig. 2) are two separate mechanisms, have eliminated routine (igniting) running of integrated form rocking arm braking system and influencing each other of engine braking running in the prior art.Such as, integrated form rocking arm braking system is in the process that starts and close in the prior art, integrated form rocking arm and its inner excentric sleeve can bear the active force (valve spring power and cylinder pressure) that exhaust valve applies, and make the reaction time lengthening that starts and close difficulty, engine braking.Also have, conventional (igniting) running and engine braking operate shared same cam and same rocking arm in the prior art, and brake member increases greatly as the frequency of utilization of excentric sleeve etc., and the probability of wearing and tearing and inefficacy is increase thereupon also.Braking exhaust valve driving mechanism 2002 of the present utility model, adopt special-purpose brake cam 2302 and special-purpose brake rocker arm 2102, in the process that starts and close, (valve among Fig. 1 is pushed open by conventional exhaust valve driving mechanism 200 can not bear the active force that exhaust valve applies, separate with special-purpose brake rocker arm 2102), brake required driving force and reduce, reaction time shortens.Brake member of the present utility model, far below spark rate (less than 10%), wearing and tearing and the probability that lost efficacy reduce as the frequency of utilization of excentric sleeve, special-purpose brake cam 2302 and special-purpose brake rocker arm 2102 etc., and the reliability and the durability of motor increase greatly.
Above-mentioned explanation has comprised a lot of concrete mode of executions, and this should not be regarded as the restriction to the utility model scope, but as representative concrete illustrations more of the present utility model, many other differentiation all might therefrom produce.For instance, the special-purpose valve actuating mechanism of the engine braking that shows here not only can be used to produce the braking valve motion of engine braking, also can be used to produce other auxiliary valve motion such as exhaust gas recirculation.
In addition, the special-purpose valve actuating mechanism of the engine braking that shows not only can be used for overhead cam engine here, also can be used for push rod/tubular type motor.
Also have, the special-purpose valve actuating mechanism of engine braking described here not only can be used for driving single valve, also can be used for driving a plurality of valves, as dual valve.
Therefore, scope of the present utility model should not decided by above-mentioned concrete illustration, but is decided by affiliated claim and the suitable power of law thereof.
Claims (7)
1. the valve actuating mechanism of an engine braking special use, be used to produce the valve motion of engine braking, described motor comprises a conventional valve actuating mechanism, described conventional valve actuating mechanism comprises conventional cam, conventional pitman arm shaft, conventional rocking arm and valve, the described conventional rocking arm that moves through of described conventional cam passes to described valve to produce the conventional valve motion of motor, it is characterized in that: the special-purpose valve actuating mechanism of described engine braking comprises brake cam, the brake rocker arm axle, brake rocker arm, eccentric swing arm sleeve and axle sleeve drive unit, described eccentric swing arm sleeve is arranged in the axis hole of described brake rocker arm, described brake rocker arm axle is arranged in the eccentric swing arm sleeve, the axle center of brake rocker arm axle and the biasing of the axle center of eccentric swing arm sleeve, one end of brake rocker arm and described brake cam constitute kinematic pair, the other end of brake rocker arm is positioned at the top of described valve, described axle sleeve drive unit drives eccentric swing arm sleeve and rotates between off position and operating position, at described off position, brake rocker arm shake center line away from valve, brake rocker arm separates with valve, at described operating position, brake rocker arm shake center line near valve, brake rocker arm contacts with valve, the transmission of movement of brake cam is given valve, produces the valve motion of engine braking.
2. the valve actuating mechanism of engine braking special use as claimed in claim 1, it is characterized in that: have phase difference between the open phase of described braking valve motion and the open phase of described conventional valve motion, the valve of braking valve motion rises the valve liter less than conventional valve motion.
3. the valve actuating mechanism of engine braking special use as claimed in claim 1, it is characterized in that: described brake rocker arm axle and described conventional pitman arm shaft are same pitman arm shaft, and described brake rocker arm and conventional rocking arm are installed on the described pitman arm shaft abreast.
4. the valve actuating mechanism of engine braking special use as claimed in claim 1, it is characterized in that: described axle sleeve drive unit is the internally-arranged type driving mechanism, it is interior and adjacent with eccentric swing arm sleeve that the axle sleeve drive unit is arranged on brake rocker arm, described internally-arranged type driving mechanism comprises driven plunger, and described driven plunger drives eccentric swing arm sleeve and rotates between off position and operating position.
5. the valve actuating mechanism of engine braking special use as claimed in claim 1, it is characterized in that: described axle sleeve drive unit is the externally-arranged type driving mechanism, described externally-arranged type driving mechanism comprises actuator, described actuator is positioned at outside the described brake rocker arm, and actuator drives eccentric swing arm sleeve and rotates between off position and operating position.
6. the valve actuating mechanism of engine braking special use as claimed in claim 1, it is characterized in that: described axle sleeve drive unit is a continuously variable driving mechanism, described continuously variable driving mechanism drives described eccentric swing arm sleeve, and the operating position of described eccentric swing arm sleeve is adjustable continuously.
7. the valve actuating mechanism of engine braking special use as claimed in claim 1, it is characterized in that: comprise brake spring in the special-purpose valve actuating mechanism of described engine braking, described brake spring is biased in described brake rocker arm the position of avoiding impacting valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011200021616U CN201924986U (en) | 2011-01-05 | 2011-01-05 | Special valve driving mechanism for engine brake |
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| CN2011200021616U CN201924986U (en) | 2011-01-05 | 2011-01-05 | Special valve driving mechanism for engine brake |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103835781A (en) * | 2012-11-26 | 2014-06-04 | 上海尤顺汽车部件有限公司 | Combined type engine brake device |
| CN104395563A (en) * | 2012-06-29 | 2015-03-04 | 伊顿(意大利)有限公司 | Valve bridge |
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2011
- 2011-01-05 CN CN2011200021616U patent/CN201924986U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN102588030B (en) * | 2011-01-05 | 2016-08-10 | 上海尤顺汽车部件有限公司 | The auxiliary valve driving mechanism of electromotor |
| US9416692B2 (en) | 2011-01-05 | 2016-08-16 | Shanghai Universoon Autoparts Co., Ltd. | Auxiliary valve actuating mechanism of engine |
| US9732643B2 (en) | 2011-01-05 | 2017-08-15 | Shanghai Universoon Autoparts Co., Ltd. | Engine valve actuation mechanism for producing a variable engine valve event |
| CN104395563A (en) * | 2012-06-29 | 2015-03-04 | 伊顿(意大利)有限公司 | Valve bridge |
| CN104395563B (en) * | 2012-06-29 | 2017-06-30 | 伊顿(意大利)有限公司 | Air valve bridge |
| CN103835781A (en) * | 2012-11-26 | 2014-06-04 | 上海尤顺汽车部件有限公司 | Combined type engine brake device |
| CN103835781B (en) * | 2012-11-26 | 2017-04-19 | 上海尤顺汽车部件有限公司 | Combined type engine brake device |
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