CN103114915A - Back pressure control valve assembly of diesel engine - Google Patents
Back pressure control valve assembly of diesel engine Download PDFInfo
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- CN103114915A CN103114915A CN2013100622170A CN201310062217A CN103114915A CN 103114915 A CN103114915 A CN 103114915A CN 2013100622170 A CN2013100622170 A CN 2013100622170A CN 201310062217 A CN201310062217 A CN 201310062217A CN 103114915 A CN103114915 A CN 103114915A
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Abstract
Provided is a back pressure control valve assembly of a diesel engine. The assembly is of a unit combination structure and comprises a driving unit A, a transmission unit B and an action unit C; and one end of a body of a cylinder of the driving unit A is hermetically, fixedly and integrally connected with a side of a transmission shell of the transmission unit B by seam allowance, the bottom of the transmission shell of the transmission unit B is hermetically, fixedly and integrally connected with the top of a valve of the action unit C by seam allowance, and the driving unit A drives the action unit C to twist via the transmission unit B so as to close or open an airflow channel of the valve. The back pressure control valve assembly has the advantages that the unit combination modular structure for specific requirements and technological parameters of WEVB (Weichai exhaust valve brake) is adopted, the standardization level is high, particularly, working media of the cylinder are not polluted or interfered by environments, accordingly, the back pressure can be accurately, stably and reliably controlled, and the back pressure control valve assembly is long in service life.
Description
Technical field
The invention belongs to the heavy-duty truck brake system technical field, be specifically related to a kind of and matching used diesel engine back pressure of heavy truck air exhaust valve brake system (WEVB) control valve assembly.
Background technique
The braking of heavy truck except the brake system with traditional, in recent years, also is equipped with pneumatic throttle as complemental brake system on outlet pipe.Not long ago, the German is a kind of more advanced braking technology of new invention again---diesel engine exhaust valve braking system (EVB system), because it is remarkable in fuel-economizing, reduction of discharging and the effect of raising secure context, thereby the EVB system becomes the standard configuration of advanced country's heavy truck and executes by rules.China is for catching up with advanced international standard, and units concerned spend huge sums and buy the EVB patent from made by German MAN company, and name as WEVB.The work of WEVB, must the diesel engine back pressure be controlled in predetermined range by the valve on outlet pipe is prerequisite, what China adopted at present is the valving of being transformed on the pneumatic throttle valve of former outlet pipe basis, it comprises cylinder, piston rod, the transmission ball-joint, rocking arm, spiracle, filtering plug and rotating shaft and valve block, above-mentioned parts all are exposed in atmosphere, volume is large, weight is large, under judder, be subject to stress large, fragile, the self-protection poor ability, application practice through WEVB is found, its reliability extreme difference, life-span extremely short (1～3 month), overslaugh WEVB applies, therefore be necessary valve is improved.
Summary of the invention
The technical problem that the present invention solves: a kind of diesel engine back pressure control valve assembly is provided, real needs and technical parameter for WEVB, adopt the modular construction of unit combination, standardization level is high, particularly the cylinder operation medium is not by environmental pollution and interference, thereby back pressure is controlled can accomplish accurately, stable, reliable, and long working life.
The technical solution used in the present invention: diesel engine back pressure control valve assembly, described assembly is modular construction, comprise driver element A, gear unit B and motor unit C, cylinder block one end of described driver element A and the drive shell side section of gear unit B seal and are fixed with one by seam, the transmission housing bottom of described gear unit B and the valve body top of motor unit C seal and are fixed with one by seam, and described driver element A drives motor unit C torsion by gear unit B the air-flow path of valve body is covered or opens.
Wherein, described driver element A is double-acting cylinder, described double-acting cylinder comprises cylinder block, piston and piston rod, described cylinder block two ends are respectively with front cover and rear end cover sealing, described piston is placed in the cylinder block cavity, described piston rod one end is connected with piston, the piston rod the other end is connected with gear unit B, wherein, on cylinder block, be shaped with near connecing valve before front cover and near after rear end cover, connecing valve, connect before described valve and after connect that valve all is communicated with the cavity of cylinder block by pore and piston front connect valve and after connect between valve and move.
Wherein, described gear unit B comprises transmission housing, connecting rod, rocking arm and upper cover, described connecting rod one end is hinged with the driving A of unit, the connecting rod the other end is hinged by hinge axis and rocking arm one end, the described rocking arm the other end and motor unit C spline joint and motor unit C can endwisely slip along spline, after described upper cover and transmission housing are connected, connecting rod and rocking arm are sealed in the transmission housing, described transmission housing madial wall is provided with the stop screw of restriction rocking arm pendulum angle.
Wherein, described motor unit C comprises rotating shaft, valve block and valve body, described rotating shaft one end and gear unit B spline joint, the rotating shaft the other end is through transmission housing and valve body Spielpassung, and described valve block is sleeved in rotating shaft fastening with pin and when rotating shaft is reversed, the air-flow path of valve body is covered or opens.
Further, described cylinder block end is shaped with long tapped through hole vertically, stay bolt screws cylinder block and transmission housing to be integrated through long tapped through hole, drive shell side section is shaped with the positioning spigot I simultaneously, be shaped with positioning hole in described positioning spigot I, described front cover inserts the positioning hole location, and described piston rod is hinged through through hole III and gear unit B in front cover, in wherein said through hole III, is provided with successively seal ring and sealing gasket.
Further, described transmission housing bottom is connected to one by connecting bolt and valve body, and described upper cover is connected to one by screw and transmission case top.
Further, be shaped with the positioning hole I on described transmission housing, the positioning spigot be shaped with on described valve body inserts in the positioning hole I, and be shaped with the through hole I on positioning spigot, described valve body opposite side and through hole I corresponding part are shaped with the through hole II, be provided with successively from top to bottom lining I and lining II in described through hole I, be provided with the lining III in described through hole II, rotating shaft is successively through the lining I, lining II and lining III and with its Spielpassung, wherein, lining I and through hole I drive fit, lining II and through hole I Spielpassung, lining III and through hole II drive fit, be provided with spring between described lining I and lining II, described through hole II external port screws with plug.
Preferably, described rotating shaft is solid shaft, and shaft set valve block position is shaped with a plurality of ribs vertically.
Preferably, described rotating shaft is hollow shaft, and shaft set valve block position has a plurality of lines of rabbet joint vertically.
Further, be provided with thermal insulative pad between described transmission housing bottom and valve body fitting surface.
The present invention's advantage compared with prior art:
1, the present invention adopts the modular construction of unit combination, accurate high strength seam location is arranged between each unit and be connected with fastening piece, integral rigidity is good, intensity is high, and the unit combination design, make interaction good, be convenient to improve the standardization of products and seriation, also be convenient to flow system production in enormous quantities, be convenient to the production process quality control, be conducive to quality assurance;
2, the present invention has changed similar products at home and abroad habitual single action cylinder in the past and has added the structure of spring reset, and adopts double-acting cylinder, and enclosed construction makes the cylinder operation medium not by environmental pollution and interference, has improved reliability and the life-span of cylinder;
3, the present invention takes all-sealed structure design, to the heavy truck of field work, the sand and dust that usually stand, drench with rain, tan by the sun, sewage sputter etc. has the self-protection ability;
4, the present invention abandoned similar products at home and abroad habitual wave air cylinder structure, and employing rigidly fixes the two moving small cylinder of connection, having abandoned ball-joint is in transmission connection, make small product size little, lightweight, good rigidly, anti-environment capacity is strong, has improved bulk strength and the tolerance judder ability of assembly;
5, the present invention, by using pneumatic single-unit properties of flow, had both ensured enough load force, avoided again piston rod to produce radially heavy load, thereby alleviated wearing and tearing, guaranteed the long lifetime of cylinder;
6, the present invention has abandoned the consistent cylinder torsion bar spring adopted of like product, and has adopted the mode that is shaped with rib in rotating shaft, has both realized guaranteeing for improving the desired hypoelasticity stiffness coefficient of backpressure regulation sensitivity that again rotating shaft has enough resistance to flexures;
7, valve block supporting portion of the present invention has adopted the middle structure that adds spring of two linings, forming novel supporting when countershaft plays the rotation supporting role lubricates and movable sealing structure, be conducive to the airtight of valve block supporting portion, prevent the pollution of flue gas to valve block supporting rotary part, apply again with the Special high-temperature oiling agent, be conducive to the valve block supporting portion and maintain the long lifetime;
8, the surface of valve body of the present invention, valve block contact flue gas, adopted surface Hardening Treatment, makes it to improve resistance to corrosion, between valve body and transmission housing, be added with the thermal insulative pad that heat-resistant material is made, conduct to gear unit in order to stop hot-fluid, gear unit is not influenced by heat.
The accompanying drawing explanation
Fig. 1 is that the present invention removes perspective view after the upper cover of gear unit;
Fig. 2 is structural front view of the present invention;
The E-E sectional view that Fig. 3 is Fig. 2;
The F-F sectional view that Fig. 4 is Fig. 2;
Fig. 5 is structural representation of the present invention;
Fig. 6 is turning shaft structure schematic diagram of the present invention;
The A-A sectional view that Fig. 7 is Fig. 6.
Embodiment
Below in conjunction with accompanying drawing, 1-7 describes embodiments of the invention.
Diesel engine back pressure control valve assembly, described assembly is modular construction, comprise driver element A, gear unit B and motor unit C, cylinder block 2 one ends of described driver element A and transmission housing 1 sidepiece of gear unit B seal and are fixed with one by seam, transmission housing 1 bottom of described gear unit B and valve body 3 tops of motor unit C seal and are fixed with one by seam, and described driver element A drives motor unit C torsion by gear unit B the air-flow path of valve body 3 is covered or opens.The positioning datum that mutual installation is arranged between driver element A, gear unit B and motor unit C three, can distinguish special line processing, by mutually positioning combined assembly, after three's assembly fully in seal structure, to normal sand and dust that occur in car for field work or field operations, stronger protective ability dabbles, drenches with rain.Be provided with thermal insulative pad 36 between described transmission housing 1 bottom and valve body 3 fitting surfaces.In order to stop that hot-fluid, to gear unit B conduction, is not influenced by heat gear unit B
Above-mentioned driver element A is double-acting cylinder, described double-acting cylinder comprises cylinder block 2, piston 4 and piston rod 5, described cylinder block 2 two ends are respectively with front cover 17 and rear end cover 21 sealings, described piston 4 is placed in cylinder block 2 cavitys, described piston rod 5 one ends are connected with piston 4, piston rod 5 the other ends are connected with connecting rod 6, wherein, on cylinder block 2, be shaped with near front cover 17 before connect valve 10 and near rear end cover 21 after connect valve 11, before described, connect valve 10 and after connect that valve 11 all is communicated with the cavity of cylinder block 2 by pore 12 and piston 4 front connect valve 10 and after connect motion between valve 11.Described cylinder block 2 ends are shaped with long tapped through hole 26 vertically, stay bolt 19 screws cylinder block 2 and transmission housing 1 to be integrated through long tapped through hole 26, the housing of transmission simultaneously 1 sidepiece is shaped with positioning spigot I 30, be shaped with positioning hole 31 in described positioning spigot I 30, described front cover 17 inserts positioning hole 31 location, described piston rod 5 is hinged with gear unit B through the through hole III 34 in front cover 17, is provided with successively seal ring 32 and sealing gasket 33 in wherein said through hole III 34.
Above-mentioned gear unit B comprises transmission housing 1, connecting rod 6, rocking arm 7 and upper cover, described connecting rod 6 one ends and piston rod 5 the other ends are hinged, connecting rod 6 the other ends are hinged by hinge axis 22 and rocking arm 7 one ends, described rocking arm 7 the other ends and rotating shaft 8 spline joints and rotating shaft 8 can endwisely slip along spline, after described upper cover and transmission housing 1 are connected, connecting rod 6 and rocking arm 7 are sealed in transmission housing 1, described transmission housing 1 madial wall is provided with the stop screw 18 of restriction rocking arm 7 pendulum angles.Described transmission housing 1 bottom is connected to one by connecting bolt 20 and valve body 3, and described upper cover is connected to one by screw and transmission housing 1 top.Due to the existence of connecting rod 6, removed the swing requirement of cylinder block 2 from, can make cylinder block 2 rigidly fix with form and the gear unit B compactness of unit assembly.Rocking arm 7 by spline fitted, combines very convenient with rotating shaft 8 upper ends.In design; rocking arm 7 swings maximum angular, and just in time with piston 4, to move to cylinder block 2 mid points consistent; near maximum angular; because the air of turnover cylinder block 2 is subject to pore 12 throttling actions; can only be with velocity of sound with current downflow; choke pressure drop only has below half of bleed pressure the power that promotes piston 4, thereby avoid big swing angle to cause the possibility of piston rod 5 larger radial forces, avoided quick-wearing cylinder block 2 and axle sleeve.And push away or the large load that draws while occurring when piston 4, the pivot angle of rocking arm 7 has approached zero, almost without radial force is arranged.
Above-mentioned motor unit C comprises rotating shaft 8, valve block 9 and valve body 3, described rotating shaft 8 one ends and rocking arm 7 spline joints, rotating shaft 8 the other ends are through transmission housing 1 and valve body 3 Spielpassung, and described valve block 9 is sleeved in rotating shaft 8 fastening with pin 23 and when rotating shaft 8 torsion, the air-flow path of valve body 3 is covered or opens.Specifically, be shaped with positioning hole I 13 on described transmission housing 1, the positioning spigot 25 be shaped with on described valve body 3 inserts in positioning hole I 13, and be shaped with through hole I 14 on positioning spigot 25, described valve body 3 opposite sides and through hole I 14 corresponding parts are shaped with through hole II 27, be provided with successively from top to bottom lining I 15 and lining II 16 in described through hole I 14, be provided with lining III 28 in described through hole II 27, rotating shaft 8 is successively through lining I 15, lining II 16 and lining III 28 and with its Spielpassung, wherein, lining I 15 and through hole I 14 drive fits, lining II 16 and through hole I 14 Spielpassung, lining III 28 and through hole II 27 drive fits, be provided with spring 24 between described lining I 15 and lining II 16, described through hole II 27 external port screw with plug 29.Rotating shaft 8 can be solid shaft, and rotating shaft 8 suit valve block 9 positions are shaped with a plurality of ribs 35 vertically.Rotating shaft 8 can be also hollow shaft, and rotating shaft 8 suit valve block 9 positions have a plurality of lines of rabbet joint vertically, and hollow rotating shaft 8 inside need add strut and be stablized.The rotating shaft 8 that existing similar products at home and abroad adopts, in order to meet the requirement of back pressure valve relatively low stiffness coefficient, rotating shaft 8 has to do carefullyyer by diameter, causes resistance to flexure very weak.The present invention is shaped with rib 35 or the line of rabbet joint in rotating shaft 8, makes the existing lower coefficient of torsional rigidity of rotating shaft 8, and higher flexural rigidity intensity is arranged again, can keep the flexibility and reliability of rotating shaft 8.Under the effect of spring 24, the end face that lining II 16 and lining III 28 end faces match with valve block 9 all the time keeps the tight power of elasticity, makes the rotary lubrication position of rotating shaft 8 exempt from the diesel engine smoke pollution simultaneously.Valve body 3 is parts that are contained on exhaust duct of diesel engine and form flue gas flow channel, rotation by valve block 9, can carry out the control of closing and opening to runner, by piston rod 5 stretch out or recovery movement is applied to by transmission part that valve block 9 rotates, the EVB knob is the manual control end of controlling cylinder block 2 inner carriers 4 motions.
Fig. 4 illustrates the structure in motor unit C, the position of matching at rotating shaft 8 and each lining, and rotating shaft 8 is smooth and accurate cylndrical surface, it is precision relation movingly with each lining with slippery inner surface, plays the sliding bearing effect.Be shaped with rib 35 on the cylinder of the stage casing of rotating shaft 8, play the torsion bar spring effect.At the torsion bar spring position, not the torsion bar commonly used (solid cylindrical, hollow cylinder, ellipse, rectangle) that can check in from mechanical handbook, but the rib shape torsion bar (seeing figure five) of recently being invented by me, according to theory of mechanics of materials, in order to improve torsion bar spring to stressed susceptibility (i.e. low stiffness coefficient), should reduce the torsion bar diameter or increase its length, but this all can make the resistance to flexure of torsion bar descend.And the rib shape torsion bar used in the present invention had both had enough low torsional stiffness, sufficiently high resistance to flexure is arranged again.About this characteristic, we can be by means of the limited elementary force analysis of computer, in rotating shaft shown in Fig. 6 and handbook, checking in the torsion bar comparative analysis, just very clear.
As seen from Figure 5, valve block 9 is to be contained in the rotating shaft 8(torsion bar of holding concurrently by the valve block borehole jack that approaches valve block 9 middle parts) on, Jin lower end, valve block hole a bit of with rotating shaft 8 drive fits, and fix by pin 23, remaining part all with the rotating shaft 8(torsion bar of holding concurrently) maintenance movingly.When rocking arm 7 rotates, driving rotating shaft 8 by the spline be coupled rotates, rotating shaft 8 is rotated by pin 23 band moving valve plates 9, after valve block 9 is closed valve body 3 runners, valve block 9 just can't be rotated further, but at this moment rocking arm 7 does not also reach the position of stop screw 18, also has one section little gap, when continuing to rotate until rocking arm 7 is contacted with stop screw 18 forward at piston rod 5 thrust lower shake-changing arms 7, it is to be out of shape by the torsional elasticity of rotating shaft 8 that this section eliminated closely spaced rotation, and the while also provides elasticity to close pretightening force for the closed condition of valve block 9.When the outlet valve exhaust due to a certain cylinder of diesel engine unit, when the exhaust pressure of pulsating surpasses the elasticity pretightening force, valve block 9 will be pushed open by pressure, and the degree of unlatching will be looked size and the shaft stiffness coefficient of pulsating pressure and be determined.Valve block 9 is opened to a certain degree, and too high diesel engine back pressure is released, and back pressure is maintained in the scope that is applicable to the EVB normal operation, herewith plays the control action to back pressure.And the coefficient of torsional rigidity of rotating shaft 8 is less, the back pressure value that can maintain is more accurate.
Working principle: before being shaped with on cylinder block 2, connect valve 10 and after connect valve 11, by the feedback tracheae, with control valve, be connected respectively, when needs diesel engine and air exhaust valve brake system are devoted oneself to work, press (or depressing) control valve button (or pedal), control valve will by after connect the feedback tracheae of valve 11 and pressurized gas are connected, pressurized gas by after connect valve 11 in pore 12 enters the cavity of cylinder body 1, promote piston 4 and travel forward.Simultaneously, control valve is opened the pipeline that front connects valve 10 to atmosphere, piston forward part gas in cylinder block 2 is discharged in atmosphere and goes (pressure release), piston 4 is pushed to the place ahead by high-pressure air, piston rod 5 is done forward and is stretched out motion, promote rocking arm 7 by connecting rod 6 and drive rotating shaft 8 rotations, make valve block 9 turn to closed position.When valve block 9 forwards the contract fully position to, rocking arm 8 does not reach the restraint position, with the contact of caging bolt 18, a little gap-title pretension gap is still arranged.When piston 4 further promotes forward, make the position of rotating shaft 8 suit valve blocks 9 resiliently deformable that twists, form the elasticity pretightening force after valve block 9 is fastened, the size of elasticity pretightening force, determining the size of the controlled back pressure lower limit of diesel engine.When the speed of a motor vehicle is higher or carrying when larger, diesel engine back pressure value will raise, and impel valve block 9 further to open on the pre-fastening moment basis greatly, bleed off pressure, thereby suppress the undue rising of diesel engine back pressure value; When speed of a motor vehicle step-down or vehicle-mounted diminishing,, under rotating shaft 8 effects, automatically turn down the gap of valve block 9 and valve body 3 inner chambers, keep the diesel engine back pressure to be worth reduction within reason, only have by the diesel engine back pressure is controlled within the specific limits, the diesel exhaust valve braking system could work.When need exit braking state, unclamp control valve button (or pedal), will connect forward valve 10 and send into high-pressure air, after connect valve 11 and open venting to atmosphere, piston 4, under the effect of the anterior pressurized gas of piston, moves backward, and piston rod 5 is regained and resetted, valve block 9 is all opened, and becomes non-braking state.
By above introduction, can also be recognized, in the whole process that EVB drops into, the continuous rotary oscillation of valve block 9, also mean that rotating shaft 8 stands the cyclic stress load for a long time, and cycle-index is too much, can make rotating shaft 8 produce fatigue ruption, and the back pressure control valve was lost efficacy.The mechanism of destroying according to cyclic stress is known, and the cyclic stress amplitude that reduces material can significantly improve fatigue life (being 3 power relations), and aforementioned rotating shaft 8 can make material in than the low stress amplitude, being issued to same effect.Improving reliability and another measure in life-span is by the rotary dynamic seal technology to lining II 16, lining III 28 and valve block 9 contact position, prevents the smoke pollution bearing working face, reduces corrosion and the wearing and tearing of contact working surface, thereby improves the rotary part life-span.Further set forth the rotating shaft dynamic sealing technology as follows: because the diesel smoke medium temperature is high to 600～700 ℃, the flue gas medium that back pressure control valve section is passed through, also, between 400～500 ℃, so in the medium of high temperature high pollution composition, maintain motive sealing, not a duck soup.For this reason, in back pressure control valve of the present invention, be provided with lining I 15, lining II 16 and lining III 28, wherein lining I 15 and lining III 28 all are stationary fit with valve body 3, lining II 16 is movingly with valve body 3, under the pretightening force effect of spring 24, make two annular end planes at place, aperture, valve block hole, with the annular end plane of lining II 16 and lining III 28, fit tightly respectively, and inside is equipped with a small amount of high temperature shaft seal packing with oiling agent separately, both making it can flexible rotating, prevent that again flue gas from infiltrating to the lining gap, make quilt cover gap oiling agent not contaminated, make thus rotary part reliability and life-span all obtain raising.
Above-described embodiment, be preferred embodiment of the present invention, not is used for limiting the scope of the present invention, and the equivalence of being done with the described content of the claims in the present invention therefore all changes, within all should being included in the claims in the present invention scope.
Claims (10)
1. diesel engine back pressure control valve assembly, described assembly is modular construction, comprise driver element A, gear unit B and motor unit C, it is characterized in that: cylinder block (2) one ends of described driver element A and transmission housing (1) sidepiece of gear unit B seal and are fixed with one by seam, transmission housing (1) bottom and valve body (3) top of motor unit C of described gear unit B seal and are fixed with one by seam, and described driver element A drives motor unit C torsion by gear unit B the air-flow path of valve body (3) is covered or opens.
2. diesel engine back pressure control valve assembly according to claim 1, it is characterized in that: described driver element A is double-acting cylinder, described double-acting cylinder comprises cylinder block (2), piston (4) and piston rod (5), front cover (17) and rear end cover (21) sealing are used respectively in described cylinder block (2) two ends, described piston (4) is placed in cylinder block (2) cavity, described piston rod (5) one ends are connected with piston (4), piston rod (5) the other end is connected with gear unit B, wherein, on cylinder block (2), be shaped with near front cover (17) before connect valve (10) and near rear end cover (21) after connect valve (11), before described, connect valve (10) and after connect that valve (11) all is communicated with the cavity of cylinder block (2) by pore (12) and piston (4) front connect valve (10) and after connect motion between valve (11).
3. diesel engine back pressure control valve assembly according to claim 1, it is characterized in that: described gear unit B comprises transmission housing (1), connecting rod (6), rocking arm (7) and upper cover, described connecting rod (6) one ends are hinged with the driving A of unit, connecting rod (6) the other end is hinged by hinge axis (22) and rocking arm (7) one ends, described rocking arm (7) the other end and motor unit C spline joint and motor unit C can endwisely slip along spline, after described upper cover and transmission housing (1) are connected, connecting rod (6) and rocking arm (7) are sealed in transmission housing (1), described transmission housing (1) madial wall is provided with the stop screw (18 of restriction rocking arm (7) pendulum angle
).
4. diesel engine back pressure control valve assembly according to claim 1, it is characterized in that: described motor unit C comprises rotating shaft (8), valve block (9) and valve body (3), described rotating shaft (8) one ends and gear unit B spline joint, rotating shaft (8) the other end is through transmission housing (1) and valve body (3) Spielpassung, and described valve block (9) is sleeved on rotating shaft (8) and goes up fastening with pin (23) and when rotating shaft (8) is reversed, the air-flow path of valve body (3) covered or opens.
5. diesel engine back pressure control valve assembly according to claim 2, it is characterized in that: described cylinder block (2) end is shaped with long tapped through hole (26) vertically, stay bolt (19) screws cylinder block (2) and transmission housing (1) to be integrated through long tapped through hole (26), transmission housing (1) sidepiece is shaped with positioning spigot I (30) simultaneously, be shaped with positioning hole (31) in described positioning spigot I (30), described front cover (17) inserts positioning hole (31) location, described piston rod (5) is hinged through the through hole III (34) in front cover (17) and gear unit B, be provided with successively seal ring (32) and sealing gasket (33 in wherein said through hole III (34)
).
6. diesel engine back pressure control valve assembly according to claim 3, it is characterized in that: described transmission housing (1) bottom is connected to one by connecting bolt (20) and valve body (3), and described upper cover is connected to one by screw and transmission housing (1) top.
7. diesel engine back pressure control valve assembly according to claim 4, it is characterized in that: be shaped with positioning hole I (13) on described transmission housing (1), the positioning spigot (25) be shaped with on described valve body (3) inserts in positioning hole I (13), and be shaped with through hole I (14) on positioning spigot (25), described valve body (3) opposite side and through hole I (14) corresponding part are shaped with through hole II (27), be provided with successively from top to bottom lining I (15) and lining II (16) in described through hole I (14), in described through hole II (27), be provided with lining III (28
)rotating shaft (8) successively through lining I (15), lining II (16) and lining III (28) and with its Spielpassung, wherein, lining I (15) and through hole I (14) drive fit, lining II (16) and through hole I (14) Spielpassung, lining III (28) and through hole II (27) drive fit, be provided with spring (24) between described lining I (15) and lining II (16), described through hole II (27) plug for external port (29) screws.
8. diesel engine back pressure control valve assembly according to claim 7 is characterized in that: described rotating shaft (8) is solid shaft, and rotating shaft (8) suit valve block (9) position is shaped with a plurality of ribs (35 vertically
).
9. diesel engine back pressure control valve assembly according to claim 7 is characterized in that: described rotating shaft (8) is hollow shaft, and rotating shaft (8) suit valve block (9) position has a plurality of lines of rabbet joint vertically.
10. according to claim 1,2,3,4,5,6,7,8 or 9 described diesel engine back pressure control valve assemblies, it is characterized in that: between described transmission housing (1) bottom and valve body (3) fitting surface, be provided with thermal insulative pad (36
).
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| CN201310062217.0A CN103114915B (en) | 2013-02-27 | 2013-02-27 | Diesel engine back pressure control valve assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108603448A (en) * | 2016-01-29 | 2018-09-28 | 沃尔沃卡车集团 | Internal combustion engine and method including controlling the engine to provide braking torque |
| CN108603448B (en) * | 2016-01-29 | 2022-03-29 | 沃尔沃卡车集团 | Internal combustion engine and method including controlling the engine to provide braking torque |
| CN108301929A (en) * | 2018-03-08 | 2018-07-20 | 东风商用车有限公司 | A kind of exhaust brake valve |
| CN108317013A (en) * | 2018-03-08 | 2018-07-24 | 东风商用车有限公司 | A kind of exhaust brake valve of engine |
| CN108317013B (en) * | 2018-03-08 | 2024-01-02 | 东风商用车有限公司 | Exhaust brake valve of engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103114915B (en) | 2015-12-16 |
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Address after: 721300 thousand village Wei Cun, Chencang District, Baoji, Shaanxi Patentee after: Baoji League Machinery Manufacturing Co., Ltd. Address before: 721300 289 West Street, Chencang District, Baoji, Shaanxi Patentee before: Baoji City Mengfa Auto Parts Co., Ltd. |