CN100587251C - Depressurizing valve and fuel injection device - Google Patents
Depressurizing valve and fuel injection device Download PDFInfo
- Publication number
- CN100587251C CN100587251C CN200610131835A CN200610131835A CN100587251C CN 100587251 C CN100587251 C CN 100587251C CN 200610131835 A CN200610131835 A CN 200610131835A CN 200610131835 A CN200610131835 A CN 200610131835A CN 100587251 C CN100587251 C CN 100587251C
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- space
- stator core
- fuel injection
- valve chest
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- 239000000446 fuel Substances 0.000 title claims abstract description 48
- 238000002347 injection Methods 0.000 title claims abstract description 36
- 239000007924 injection Substances 0.000 title claims abstract description 36
- 239000012530 fluid Substances 0.000 claims abstract description 6
- 230000009467 reduction Effects 0.000 claims description 51
- 210000000635 valve cell Anatomy 0.000 claims description 35
- 239000000295 fuel oil Substances 0.000 claims description 21
- 230000004907 flux Effects 0.000 claims description 12
- 239000000696 magnetic material Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 15
- 230000008859 change Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000005476 soldering Methods 0.000 description 7
- 238000003466 welding Methods 0.000 description 7
- 239000002828 fuel tank Substances 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
An object of the invention is to provide a depressurizing valve (9) mounted to a common rail (1) for a fuel injection device, in which a direction of a connector (32) for the depressurizing valve canbe adjusted, without affecting an air gap and a sealing performance. The depressurizing valve (9) has a valve unit (10) and a coil unit (30) which is detachably assembled to the valve unit by a mounting member, such as a retaining nut (34). A valve housing (12) has an inside space, which is fluid tightly separated into first and second spaces (121, 122) by a connecting member (17), which is fluidtightly connected to the valve housing (12) and a stator core (18). A valve body (11) and a spring (19) are arranged in the first space (121) for closing a flow control port (151). A cylindrical coil(31) is accommodated in the second space (122), such that the coil is rotatable with respect to the valve housing (12).
Description
Technical field
The present invention relates to the reduction valve of oil pressure in a kind of common rail that when Motor Vehicle slows down, reduces fuel injection apparatus, more specifically to a kind of fuel injection apparatus with reduction valve.
Background technique
The traditional fuel injection apparatus that is used for internal-combustion engine comprises: the common rail that is used to store high pressure fuel; Be used for high pressure fuel fuel injection valve in each cylinder body from the common rail injection to the motor; Be used for fuel oil is aspirated, pressurizes and high pressure fuel is supplied to the oil pump of common rail; Be used for to turn back to the fuel oil return path of low voltage side (fuel tank) from a part of high pressure fuel that is total to rail; And the electromagnetic type reduction valve, this electromagnetic type reduction valve is operated when Motor Vehicle slows down opens the fuel oil return path with the oil pressure in the common rail of quick minimizing.
This reduction valve for example is installed on the common rail.Yet in the disclosed fuel injection apparatus, reduction valve is installed on the oil pump in Japanese documentation No.2001-59459.Reduction valve has flange portion (be formed with in this lip part office and be used for inserting the through hole of wearing bolt), and this reduction valve by above-mentioned bolt to oil pump.
In the disclosed fuel injection apparatus of Japanese documentation No.H11-141428, the helical part is fixed on the main body part of fuel injection valve by locking nut, and wherein its solenoid valve partly can be used as reduction valve.
The reduction valve that is installed on the common rail has the joint that receives driving current.This joint is electrically connected on the drive circuit by bunch, and wherein rail is installed on the motor altogether.Yet, when reduction valve is installed on the common rail, the direction that is necessary to regulate joint because altogether rail must with limited space mounting to motor and the position of joint (direction) must be selected as preposition (direction) with respect to rail altogether.Also do not propose such scheme up to now, the direction of joint is regulated along the direction that will be installed to the reduction valve on the common rail.
If (wherein as the fixed structure of the described reduction valve of above-mentioned prior art (Japanese documentation No.2001-59459), the flange portion of this reduction valve is fixed on the oil pump by bolt) attempt to be applied on the fixed structure that the reduction valve that is installed on the common rail is used, then in the common rail of tubular, should form bolt hole.In a kind of like this fixed structure, the direction that is arranged on the joint in the reduction valve can be adjusted to predetermined required direction.Yet, in fact be difficult to forming bolt hole in the rail altogether, because rail forms tubular usually altogether, therefore there is not sufficient space to be used for bolt hole.
In the disclosed fuel injection apparatus of Japanese documentation No.H11-141428, can be by becoming flexible the direction that locking nut is regulated joint part.Yet, if locking nut by loosening, the position that inner part for example is used to regulate the packing ring, armature of air clearance etc. will change.The result can bring such problem, and promptly after in a single day locking nut was become flexible and then tighten, the air clearance can change.In addition, if locking nut is become flexible, the position and the contact conditions that then are placed on the sealed member between locking nut and the valve chest also can change.Correspondingly, in case locking nut just is necessary to check sealability after being tightened once more.
Be used for the structure that the helical with electromagnetic coil is fixed on the valve chest and be applied to and will be installed under the situation of the reduction valve on the common rail in above-mentioned prior art (Japanese documentation No.H11-141428), the direction of joint part can be regulated by loosening locking nut.Yet, still have following problem, promptly as in the above-mentioned fuel injection apparatus of the prior art, the air clearance may change and/or sealability should be checked once more.
Summary of the invention
The present invention is based on the problems referred to above and make.Therefore, the purpose of this invention is to provide a kind of fuel injection apparatus, more particularly provide and be installed to fuel injection apparatus with the reduction valve on the rail altogether, the direction that wherein is used for the joint of reduction valve can be regulated and can not be influenced air clearance and sealability.
According to the present invention, reduction valve comprise have valve body (11) valve cell (10) and be used for to cylindrical solenoid (31) supply of current the time, opening the coil unit (30) of direction aspirating valve main body (11) along valve.
Valve cell (10) comprises and will be installed to the valve chest (12) of the cylindrical form on the common rail (1); The armature (13) integrally formed with valve body (11); Be formed on first space (121) in the valve chest (12), it is used to hold valve body (11) and armature (13) and is connected to fuel oil return path (1a, 8); With second space (122) that is formed in the valve chest (12), it is used to hold electromagnetic coil (31), so that electromagnetic coil (31) can be along circumferentially with respect to valve chest (12) rotation, described second space (122) forms coaxially with first space (121).Valve cell (10) also comprises: stator core (18), and it is arranged in interior all spaces of electromagnetic coil (31), and relative with armature (13) vertically; Be connected to fluid-tight valve chest (12) and be connected to connected element on the stator core (18) (17,17a), be used for and stator core (18) is divided into above-mentioned first space and second space (121,122) with the inner space of valve chest (12) together; With an end place that is arranged on first space (121) and have the valve seat (15) of fluid control port (151), its by valve body (11) make with moving axially operability the space of winning (121) together the hyperbaric chamber (1e) of rail (1) be connected, wherein valve body (11) and armature (13) remain in first space (121) between valve seat (15) and the stator core (18) vertically movably.
Coil unit (30) removably is assembled on the valve cell (10), and comprises: the joint (32) integrally formed with electromagnetic coil (31); With being used for removably electromagnetic coil (31) and joint (32) are installed to assembly (34,35) on the valve cell (10).
According to above-mentioned feature, can regulate with the direction of the integrally formed joint (32) of electromagnetic coil (31), because electromagnetic coil (31) is contained in second space (122), so that electromagnetic coil (31) can be along circumferentially rotating with respect to valve chest (12).
In addition, though when assembly (34,35) by become flexible and fastening with the adjusting joint (32) direction the time, can not change the air clearance between armature (13) and the stator core (18) yet.This is because valve body (11) and armature (13) are maintained at the cause between valve seat (15) and the stator core (18).
In addition, between the first tubular space (121) and the second tubular space (122), do not need extra seal element (for example O type circle) because the first tubular space (121) that is used to hold valve body (11) and armature (13) by connected element (17) fluid-tight be connected to the second tubular space (122) that is used to hold coil (31).Therefore, after assembly (34,35) is become flexible and be fastening, do not need to check once more sealability.
According to another feature of the present invention, connected element (17) is made by nonmagnetic substance.Because nonmagnetic substance, magnetic flux is blocked between valve chest (12) and stator core (18), is attracted so that can guarantee valve body (11) and armature (13).
Another feature according to the present invention, reduction valve comprises: the valve cell (10) with valve body (11); And coil unit (30), it is used for opening direction aspirating valve main body (11) along valve to cylindrical solenoid (31) supply of current the time.
Valve cell (10) comprising: the valve chest (12) that will be installed to the cylindrical form on the common rail (1); The armature (13) integrally formed with valve body (11); Be formed on first space (121) in the valve chest (12), it is used to hold valve body (11) and armature (13) and is connected to fuel oil return path (1a, 8); Be formed on second space (122) in the valve chest (12), it is used to hold electromagnetic coil (31), so that electromagnetic coil (31) can be along circumferentially with respect to valve chest (12) rotation, described second space (122) forms coaxially with first space (121).
Valve cell (10) also comprises: stator core (18b), and it is arranged in interior all spaces of electromagnetic coil (31), and relative with armature (13) vertically; Connected element (17b), it has formed one of valve chest (12) and stator core (18b), and be used for and stator core (18b) is divided into above-mentioned first space and second space (121,122) with the inner space fluid-tight ground of valve chest (12) together, wherein the magnetic flux between this connected element (17b) restriction stator core (18b) and the valve chest (12) is mobile; With an end place that is arranged on first space (121) and have the valve seat (15) of fluid control port (151), its by valve body (11) make with moving axially operability the space of winning (121) together the hyperbaric chamber (1e) of rail (1) be connected, and valve body (11) and armature (13) remain in first space (121) between valve seat (15) and the stator core (18b) vertically movably.
Coil unit (30) removably is assembled on the valve cell (10), and comprises: the joint (32) integrally formed with electromagnetic coil (31); With being used for removably electromagnetic coil (31) and joint (32) are installed to assembly (34) on the valve cell (10).
According to above-mentioned feature, can regulate with the direction of the integrally formed joint (32) of electromagnetic coil (31), can not change the air clearance between armature (13) and the stator core (18b) yet, and after assembly (34) is become flexible once more and be fastening, not need to check sealability.
In addition, the quantity of attachment portion can reduce, because connected element (17b) forms with one of valve chest (12) and stator core (18b).
According to another feature of the present invention, reduction valve comprises: the valve cell (10) with valve body (11); And coil unit (30), it is used for opening direction aspirating valve main body (11) along valve to cylindrical solenoid (31) supply of current the time.
Valve cell (10) comprising: the valve chest (12c) that is installed to the cylindrical form on the common rail (1); The armature (13) integrally formed with valve body (11); Be formed on first space (121) in the valve chest (12c), it is used to hold valve body (11) and armature (13) and is connected to fuel oil return path (1a, 8); Be formed on second space (122) in the valve chest (12c), it is used to hold electromagnetic coil (31), so that electromagnetic coil (31) can be along circumferentially with respect to valve chest (12c) rotation, described second space (122) forms coaxially with first space (121).
Valve cell (10) also comprises: stator core (18c), and it is arranged in interior all spaces of electromagnetic coil (31), and relative with armature (13) vertically; Connected element (17c), it has formed valve chest (12c) and stator core (18c) and has been positioned between the two, wherein this connected element (17c) and stator core (18c) are divided into above-mentioned first space and second space (121,122) with the inner space of valve chest (12c), and the magnetic flux between this connected element (17c) restriction stator core (18c) and the valve chest (12c) flows; With an end place that is arranged on first space (121) and have the valve seat (15) of fluid control port (151), its by valve body (11) make with moving axially operability the space of winning (121) together the hyperbaric chamber (1e) of rail (1) be connected, and valve body (11) and armature (13) remain in first space (121) between valve seat (15) and the stator core (18c) vertically movably.
Coil unit (30) removably is assembled on the valve cell (10), and comprises: the joint (32) integrally formed with electromagnetic coil (31); With being used for removably electromagnetic coil (31) and joint (32) are installed to assembly (34) on the valve cell (10).
According to above-mentioned feature, can regulate similarly with the direction of the integrally formed joint (32) of electromagnetic coil (31), air clearance between armature (13) and the stator core (18b) can not change yet, and does not need to check sealability after assembly (34) is become flexible once more and be fastening.
In addition, first space (121) and second space (122) but fluid-tight ground separately, and do not need that connecting means is for example welded, soldering etc. because valve chest (12c), stator core (18c) and connected element (17c) are formed integrally as a unit.
According to an additional features of the present invention, recessed portion (181) is formed in the stator core (18,18b, 18c), and towards first space (121) opening, and spring (19) is arranged in and is used in the recessed portion (181) along valve closing direction pushing valve body (11).
According to above-mentioned feature, even separating from valve cell (10), removes coil unit (30), spring (19) can not split away off from valve cell (10) yet.
According to a further general feature of the present invention, coil unit (30) comprises the plate member of being made by magnetic material (33), and it is arranged between electromagnetic coil (31) and the joint (32), and and joint (32) molded integratedly.
The result makes, without any need for preventing that sealing enters the sealed member of electromagnetic coil (31), because electromagnetic coil (31) and joint (32) are molded integratedly.
Description of drawings
By following detailed explanation and with reference to the accompanying drawings, above-mentioned and other purposes, feature and advantage of the present invention will become clearer, wherein:
Fig. 1 is the schematic representation of system architecture with common rail type fuel injection device of reduction valve;
Fig. 2 is the sectional view of reduction valve 9 among Fig. 1;
Fig. 3 is the view sub-anatomy of reduction valve 9;
Fig. 4 is the sectional view that is installed to the reduction valve 9 on the common rail 1;
Fig. 5 is the sectional view according to second embodiment's reduction valve;
Fig. 6 is the sectional view according to the 3rd embodiment's reduction valve;
Fig. 7 is the sectional view according to the 4th embodiment's reduction valve; With
Fig. 8 is the sectional view according to the 5th embodiment's reduction valve;
Embodiment
(first embodiment)
Below the first embodiment of the present invention will be described.Fig. 1 is the schematic representation of system architecture with common rail type fuel injection device of reduction valve.This fuel injection apparatus has common rail 1, and it forms tubular roughly and wherein stores high pressure fuel.A plurality of fuel injection valves 2 are connected on the common rail 1, and wherein fuel injection valve 2 is installed on each engine cylinder-body of diesel engine (not shown), so that the high pressure fuel that is stored in the common rail 1 is ejected in the engine cylinder-body by each fuel injection valve 2.Be used for controlling by looking ECU (Electrical Control Unit) not shown in the figures (ECU) during the opening of valves timing of each fuel injection valve 2 and the opening of valves.
ECU comprise have CPU, the known microcomputer parts of ROM, RAM etc., and carry out various calculating and the program be stored in the microcomputer.After the pedal travel that receives for example engine speed, accelerator pedal (not shown) etc., the various operations of ECU control fuel injection valve 2, quantity control valve 7, reduction valve 9 etc.
High pressure fuel is fed to common rail 1 from oil pump 3, and high pressure fuel is stored under the pressure corresponding to fuel-injection pressure among the hyperbaric chamber 1e of common rail 1.Known variable capacitance type oil pump can be used as oil pump 3.Fuel from fuel tank 4 is supplied to oil pump 3 by oil pump 5, and fuel oil is pressurizeed by oil pump 3.ECU receives pressure signal from pressure transducer 6 places that are arranged on common rail 1, and the quantity control valve 7 of control setting to the oil pump 3, so that fuel-injection pressure is adjusted to by engine load and the determined predetermined value of engine speed.
Further explain reduction valve 9 below with reference to Fig. 2-4.Fig. 2 is the sectional view of reduction valve 9, and Fig. 3 is its exploded view, and Fig. 4 has shown the reduction valve 9 that is installed on the common rail 1.
Valve cell 10 has by magnetic metal makes and is screwed to cylindrical valve housing 12 in the common rail 1.The first tubular space 121 and the second tubular space 122 are formed on the inboard of valve chest 12, and longitudinally are connected to each other.Valve body 11 and armature 13 are contained in the first tubular space 121.The coil 31 of coil unit 30 is contained in the second tubular space 122, so that coil 31 can be along rotating in a circumferential direction.
First male screw portion 124 is formed on the outer surface of valve chest 12, so that male screw portion 124 will be screwed in the female thread part 1b that is formed in the common rail 1.Annular groove 125 also is formed on the outer surface of valve chest 12 between first male screw portion 124 and communications ports 123, to hold for example hermetic unit 16 of O type circle.Hexagon head part 126 further is formed on the central part office of valve chest 12, and wherein when valve chest 12 installations (being threaded) were on being total to rail 1, hexagon head part 126 was positioned at the outside of common rail 1.Second male screw portion 127 is formed on the rear end of valve chest 12, and it will engage with locking nut 34 (being also referred to as assembly), or be screwed in the locking nut 34.
The annular connected element of being made by nonmagnetic metal 17 is arranged in the boundary portion office between first space 121 and second space 122.The stator core of being made by magnetic metal 18 is arranged in second space 122, so that stator core 18 is relative with armature 13.By welding, soldering etc., be fixed to connected element 17 fluid-tight on the valve chest 12 and stator core 18 on.First space 121 and second space 122 so connected component 17 and stator core 18 fluid-tight ground are separated.
Recessed portion 181 towards first space, 121 openings is formed in the stator core 18.Spring 19 is arranged in the recessed portion 181, so that valve body 11 and armature 13 are pushed by the direction (being the valve closing direction) of spring 19 towards valve seat 15.
After valve body 11, armature 13, cylinder guide 14 and spring 19 are inserted into first space 121, valve seat 15 by riveted joint by press fit or be fixed to the opening end (end of left-hand side) of valve chest 12.As above, valve body 11, armature 13 and spring 19 are maintained in first space 121 between valve seat 15 and the stator core 18.
Locking nut (fixing device) 34 comprises cylindrical portion 342 and from one of the cylindrical portion 342 vertical flange portion 343 that extends internally of end.Female thread part 341 is formed on the interior perimeter surface place of cylindrical portion 342, so that female thread part 341 will be meshed with second helical thread portion 127 that is formed on valve chest 12 places.After coil 31 and plate 33 were molded in the joint 32 integratedly, locking nut 34 was assembled on the joint 32, so that the inner of flange portion 343 is keeping the outer peripheral portion of plate 33, wherein locking nut 34 can be with respect to joint 32 rotations.
Below will describe the process of assembling reduction valve 9 in detail.Coil unit 30 at first temporarily is assembled on the valve cell 10.That is, coil 31 is inserted in the second tubular space 122, and locking element 34 is screwed on second helical thread portion 127, inserts between the flange portion 343 of vertical end of valve chest 12 and locking nut 34 up to the outer peripheral portion of plate 33 and is held.
Then, the male screw portion 124 of valve chest 12 is screwed into the female thread part 1b of common rail 1, so that reduction valve 9 (particularly being valve chest 12) firmly is fixed on the common rail 1.In the above-mentioned position that is screwed into of valve chest 12, the front surface 152 of valve seat 15 together rail 1 sealing surfaces 1c contact and be close to above so that the space between front surface 152 and the sealing surfaces 1c is sealed.In addition, hermetic unit 16 contact is the surperficial 1d of interior week sealing of rail 1 altogether, passes through valve chest 12 and the clearance leakage between the rail 1 altogether to prevent fuel oil.
Then, locking nut 34 unclamps from valve chest 12, so that the direction of joint 32 is with respect to rail 1 adjusting altogether.Afterwards, locking nut 34 is screwed on the valve chest 12 once more tightly, to finish reduction valve 9 is assembled into process on the common rail 1.
In the above-described embodiments, coil unit 30 temporarily is assembled on the valve cell 10, then valve cell 10 and coil unit 30 together mutual group install on the common rail 1.Yet valve cell 10 can at first be assembled on the common rail 1 and not need temporary transient Assembly line coil unit 30.In this case, after valve cell 10 has been assembled into common rail 1, coil unit 30 will firmly be assembled on the valve cell 10.
In above-mentioned common rail type fuel injection device, under other vehicle operation conditions, cut off the electric current supply of the coil 31 that leads to reduction valve 9 except the Motor Vehicle deceleration-operation.Therefore, valve body 11 and armature 13 are pushed towards valve seat 15 by spring, so that valve body 11 contacts to close FLOW CONTROL port one 51 with valve seat 15.The result makes, has closed the fuel oil return path.
When the pedal travel of accelerator pedal reduces fast (when Motor Vehicle slows down), ECU has opened reduction valve 9, so that a part of high pressure fuel of rail 1 is discharged into fuel tank 4 altogether.The result makes that the fuel pressure in the rail 1 is reduced to goal pressure apace altogether.
More precisely, when the terminal 321 of electric current by joint 32 was supplied to coil 31, magnetic flux resulted from around the coil 31 to produce attraction force between stator core 18 and armature 13.Then, armature 13 and valve body 11 spring force that overcomes spring 19 carries out displacement towards stator core 18.Valve body 11 separates to open the FLOW CONTROL port one 51 of valve seat from valve seat 15.The result makes, altogether 141 of the FLOW CONTROL port one 51 of the high pressure fuel in the rail 1 by valve seat 15, guide 14, the communications ports 123 of valve chest 12, the fuel oil of rail 1 returns port 1a and blow-by tube 8 flows to fuel tank 4 altogether.
In the above-described embodiments, coil 31 is inserted in second space 122 of valve chest 12 so that coil 31 can be therein with respect to valve chest 12 rotations.Correspondingly, the direction that forms the joint 32 of coil 31 can be regulated.
In addition, in the above-described embodiments, valve body 11 and armature 13 are kept by valve seat 15 and stator core 18 and between it.Correspondingly, though when locking nut 34 by loosening when regulating the direction of joint 32, can not change the air clearance between armature 13 and the stator core 18 yet.
In addition because valve body 11, armature 13 and spring 19 are kept by valve seat 15 and stator core 18 and between it, even when coil unit 30 when valve cell 10 is removed, these parts 11,13 and 19 can not separated from valve chest 12.
In addition, in the above-described embodiments, second space 122 that is used for first space 121 of valve body 11 and armature 13 and is used for coil 31 is by connected element 17 and stator core 18 fluid-tight relative to each other.Therefore, between first space 121 and second space 122, do not need extra seal element (for example O type circle).In addition, need after becoming flexible and tighten once more, locking nut 34 not check sealability yet.
(second embodiment)
Below will explain the second embodiment of the present invention.Fig. 5 has shown the sectional view according to second embodiment's reduction valve.Identical reference character representative and the same or analogous parts of first embodiment.
In above-mentioned first embodiment, coil unit 30 is assembled on the valve cell 10 by locking nut 34, and wherein the female thread part 341 of locking nut 34 is threaded with the male screw portion 127 of valve chest 12.The place that second embodiment is different from first embodiment is that coil unit 30 is assembled into the method on the valve cell 10.
As shown in Figure 5, bolt 35 is as fixing device.More precisely, female thread part 182 is formed on stator core 18 places, and through hole 322 is formed on and is used for inserting bolt 35 in the joint 32, and through hole 331 is formed on the helical thread portion that also is used for inserting bolt 35 in the plate 33.Bolt 35 can form hexagon head bolt (head that is bolt has hexagonal groove) or the like.
(the 3rd embodiment)
Below will explain the third embodiment of the present invention.Fig. 6 has shown the sectional view according to the 3rd embodiment's reduction valve.Identical reference character representative and the same or analogous parts of first embodiment.
In first embodiment, annular connecting part 17 is used for valve body 11 is connected to stator core 18.According to the 3rd embodiment, used tubular attachment portion 17a with thin-walled.
If connected element 17 is made by magnetic material in first embodiment, then magnetic flux can not flow to armature 13 from stator core 18, but by attachment portion 17 from stator core 18 flow valves housings 12.Then, do not produce attraction force at armature 13 places.This is because connected element 17 must be made by nonmagnetic substance in first embodiment.
On the contrary, the 3rd embodiment's connected element 17a is made by magnetic material.As shown in Figure 6, connected element 17a forms has the tubular of less thickness, and the zone is limited between stator core 18 and the valve chest 12 thereby magnetic flux is mobile in a small amount so that magnetic flux flows.As mentioned above, even work as magnetic material as connected element 17a, the magnetic flux of the connected element 17a that flows through also can maintain smaller value, and magnetic flux flows to armature 13 to produce attraction force from stator core 18.
As the mobile optional method of magnetic flux between restriction stator core 18 and the valve chest 12, connected element 17 and the connected element 17a among the 3rd embodiment in first embodiment can be made by the non-corrosive material with magnetic, and connected element 17 or 17a carry out unmagnetized by diffusion zone or similar approach.
(the 4th embodiment)
Below will explain the fourth embodiment of the present invention.Fig. 7 has shown the sectional view according to the 4th embodiment's reduction valve.Identical reference character representative and the same or analogous parts of first embodiment.
As shown in Figure 7, the attachment portion 17b of thin-walled forms the stator core 18b that is made by magnetic material.Attachment portion 17b by welding, soldering or similar approach fluid-tight be connected on the valve chest 12.
In first to the 3rd embodiment, in between connected element 17 (17a) and the valve chest 12 and two boundary portion offices between connected element 17 (17a) and stator core 18, connected element 17 or 17a are connected to valve chest 12 by welding, soldering and similar approach and are connected on the stator core 18.Yet according to the 4th embodiment, the boundary of attachment portion 17b between attachment portion 17b and valve chest 12 connects, so that can reduce the quantity of processes such as welding, soldering.
Alternatively, the tubular attachment portion of thin-walled can form the valve chest of being made by magnetic material 12, and the thin-walled attachment portion can by fluid-tight such as welding, soldering be connected on the stator core 18.
(the 5th embodiment)
Below will explain the fifth embodiment of the present invention.Fig. 8 has shown the sectional view according to the 5th embodiment's reduction valve.Identical reference character representative and the same or analogous parts of first embodiment.
As shown in Figure 8, valve chest 12c and stator core 18c form the single piece for being made by magnetic material, and wherein stator core 18c is connected by thin-walled attachment portion 17c with valve chest 12c.According to this embodiment, first space 121 and second space 122 are separated to fluid-tight each other and are not needed by connection procedures such as welding, solderings.
Claims (8)
1. fuel injection apparatus that is used for internal-combustion engine, it comprises:
Be used to store the common rail (1) of high pressure fuel;
Be used for to be total to the high pressure fuel injection of rail (1) to in-engine fuel injection valve (2);
Be connected to operability the fuel oil return path (1a, 8) between common rail (1) and the low voltage side (4); With
Reduction valve (9), it is used to open and close fuel oil return path (1a, 8), so that the high pressure fuel that is depressurized valve (9) part when opening when fuel oil return path (1a, 8) flows to low voltage side (4) from rail (1) altogether,
Wherein, described reduction valve (9) comprising:
Valve cell (10) with valve body (11), it is used to open and close fuel oil return path (1a, 8); With
Coil unit (30) with cylindrical solenoid (31), it is used for opening direction aspirating valve main body (11) along valve to electromagnetic coil (31) supply of current the time;
Wherein, described valve cell (10) further comprises:
The valve chest of cylindrical form (12);
The armature (13) integrally formed with valve body (11);
Be formed on first space (121) in the valve chest (12), it is used to hold valve body (11) and armature (13), and is connected on the fuel oil return path (1a, 8),
Be formed on second space (122) in the valve chest (12), it is used to hold electromagnetic coil (31), so that electromagnetic coil (31) can be along circumferentially with respect to valve chest (12) rotation, described second space (122) forms coaxially with first space (121);
Stator core (18,18b, 18c), it is arranged in interior all spaces of electromagnetic coil (31) and is relative with armature (13) vertically, wherein said second space (122) is formed on the periphery of stator core (18), so that second space (122) are with respect to first space (121) fluid-tight and be independent of first space (121);
Connected element (17,17a, 17b, 17c), it is connected to valve chest (12,12c) and stator core (18,18b is 18c) on the two or integrally formed with the two, perhaps connected element (17,17a, 17b, 17c) be connected to valve chest (12,12c) and stator core (18,18b, on one 18c), and with valve chest (12,12c) and stator core (18,18b, 18c) another is integrally formed, be used for and stator core (18,18b, 18c) (12, fluid-tight ground, inner space 12c) is divided into above-mentioned first space (121) and second space (122) with valve chest together; With
Be arranged on an end place in first space (121) and have the valve seat (15) of fluid control port (151), described fluid control port (151) by valve body (11) make with moving axially operability the space of winning (121) together the hyperbaric chamber (1e) of rail (1) be connected, wherein valve body (11) and armature (13) remain on valve seat (15) and stator core (18 vertically movably, 18b is 18c) in first space (121) between;
Wherein, coil unit (30) removably is assembled on the valve cell (10) and further comprises:
The joint (32) integrally formed with electromagnetic coil (31); With
Be used for removably electromagnetic coil (31) and joint (32) are installed to assembly (34,35) on the valve cell (10).
2. fuel injection apparatus as claimed in claim 1, wherein said connected element (17) is made by nonmagnetic substance.
3. fuel injection apparatus as claimed in claim 1, wherein:
Described connected element (17b) forms with one of valve chest (12) and stator core (18b), so that the magnetic flux between this connected element (17b) restriction stator core (18b) and the valve chest (12) flows.
4. fuel injection apparatus as claimed in claim 1, wherein:
Described connected element (17c) forms with valve chest (12c) and stator core (18c) and is positioned between the two, so that the magnetic flux between this connected element (17c) restriction stator core (18c) and the valve chest (12c) flows.
5. as arbitrary described fuel injection apparatus among the claim 1-4, wherein:
Recessed portion (181) is formed in the stator core (18,18b, 18c), and towards first space (121) opening, and
Spring (19) is arranged in and is used in the recessed portion (181) along valve closing direction pushing valve body (11).
6. as arbitrary described fuel injection apparatus among the claim 1-4, wherein:
Described coil unit (30) comprises the plate member of being made by magnetic material (33), and it is arranged between electromagnetic coil (31) and the joint (32), and and joint (32) molded integratedly.
7. fuel injection apparatus as claimed in claim 6, wherein:
Described plate member (33) is and the relative disc-shaped part of valve chest (12c) and stator core (18,18b, 18c), and
Described assembly (34) is the locking nut that will be screwed on the valve chest (12c), and wherein said plate member (33) is inserted between valve chest (12c) and the locking nut (34).
8. fuel injection apparatus as claimed in claim 6, wherein:
Described plate member (33) is and valve chest (12) and the relative disc-shaped part of stator core (18), and
Described assembly (35) is the bolt that will be screwed on the stator core (18), and wherein said plate member (33) is inserted between the bolt head of stator core (18) and bolt (35).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005300318 | 2005-10-14 | ||
| JP300318/2005 | 2005-10-14 | ||
| JP186665/2006 | 2006-07-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1948742A CN1948742A (en) | 2007-04-18 |
| CN100587251C true CN100587251C (en) | 2010-02-03 |
Family
ID=38018336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200610131835A Expired - Fee Related CN100587251C (en) | 2005-10-14 | 2006-10-12 | Depressurizing valve and fuel injection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100587251C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130001891A1 (en) * | 2011-06-29 | 2013-01-03 | Caterpillar Inc. | Sealing assembly |
| FR2999658A1 (en) * | 2012-12-18 | 2014-06-20 | Delphi Technologies Holding | HIGH PRESSURE VALVE |
| CN108757251B (en) * | 2018-03-07 | 2023-09-22 | 宁波赛驰动力技术有限公司 | Fuel injector |
| DE102019131537B4 (en) * | 2019-11-21 | 2022-01-27 | Kendrion (Villingen) Gmbh | Device for pressure regulation in a fuel supply of an internal combustion engine with a common rail injection |
-
2006
- 2006-10-12 CN CN200610131835A patent/CN100587251C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1948742A (en) | 2007-04-18 |
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| PB01 | Publication | ||
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