CN100467857C

CN100467857C - Adjusting device

Info

Publication number: CN100467857C
Application number: CNB2007100789991A
Authority: CN
Inventors: 羽生俊治
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2006-02-23
Filing date: 2007-02-16
Publication date: 2009-03-11
Anticipated expiration: 2027-02-16
Also published as: CN101025139A

Abstract

A regulating device includes a regulating valve with a valve housing, which has a fluid inlet, a fluid outlet, accomodates the valve elements pressing by the fluid pressure in the fluid inlet, biasing element, and is compressed between the valve element and plug, and resists the bias force of the fluid pressure to the valve element. With the development of the fluid pressure, the valve element moves owing to resisting bias force so as to communicate fluid inlet and fluid outlet. The valve element makes the plug move outward relative to the valve housing by bias element so as to reduce the bias force, when the fluid pressure is equal to or more than the preset pressure. A displacement regulation unit coming against plug is to limit its movement and regulate the reduction of the bias force.

Description

Controlling device

Technical field

The present invention relates to a kind of controlling device.

Background technique

Controlling device comprises the modulating valve that is used for control hydrodynamic pressure under predetermined pressure, for example, in JP-A-2002-250459, is provided with a kind of controlling device at the supply pump that is used for the joint-track type ejecting system.

As shown in Figure 8, supply pump 3 comprises feed pump 14, modulating valve 15, Perfected electromagnetic metering valve 16 and high-pressure service pump 17.Feed pump 14 with fuel from fuel tank force feed to high-pressure service pump 17.Modulating valve 17 comprises the valve chest 44 with fluid input 41 and fluid output 42.Modulating valve 15 also comprises the valve element 45 that is supported on movably in the valve chest 44, and returning spring 47, and it makes valve element 45 at the direction upper offset that blocks fluid input 41.Along with the pressure of fluid input 41 uprises, modulating valve 15 makes fluid input 41 communicate with fluid output 42.Like this, along with near the pressure the fluid input 41 increase, the fluid that turns back to low-pressure channel from the discharge port of feed pump 14 increases, and this low-pressure channel links to each other with the inhalation port of supply pump 14.Thereby it is constant that the outlet pressure of supply pump 14 keeps.

But supply pump 3 may be for example owing to the obstruction of fuel filter, the throttling of fuel pipe etc. produce the big such anomaly of discharge load.Perhaps, supply pump 3 may produce the anomaly as catching air in the fuel.When vehicle running hours under abnormal state, feed pressure may produce pulse, may have on the element that unusual load is applied to supply pump 3.As a result, supply pump 3 may damage singularly, and perhaps the element of supply pump 3 may rupture and cause vehicle damage.Perhaps, the spring of Perfected electromagnetic metering valve 16 may rupture, so, may in common rail pressure, produce more anomaly etc.As a result, the motor of vehicle may damage.

Summary of the invention

In view of aforementioned and other problem, the object of the present invention is to provide a kind of controlling device of forcing to reduce fuel pressure.

According to a direction of the present invention, a kind of controlling device is provided, it has modulating valve, and described modulating valve comprises valve chest, the valve element that can move, the connector that links to each other with valve chest and biasing element in valve chest.Valve chest has fluid input and fluid output.The valve element is exerted pressure by the hydrodynamic pressure in the fluid input.Biasing element is compressed between valve element and connector, on the direction of blocking fluid input at the valve element valve element is applied bias force.Along with hydrodynamic pressure increases, the valve element moves, and fluid input and fluid output are communicated.When hydrodynamic pressure becomes when being equal to or greater than predetermined pressure, biasing element applies compressive load to connector, so that connector outwards moves with respect to valve chest, to reduce the bias force of biasing element.Described controlling device also comprises the displacement regulon.When connector during with respect to the outside mobile prearranging quatity of valve chest, the displacement regulation unit is against connector, is used to limit moving to set the reduction of biasing element bias force of connector.

According to a further aspect in the invention, provide a kind of controlling device, it has modulating valve, and described modulating valve comprises valve chest, the valve element that can move, the breech lock that links to each other with valve chest and first biasing element in valve chest.Valve chest has fluid input and fluid output.The valve element is exerted pressure by the hydrodynamic pressure in the fluid input.First biasing element is compressed between breech lock and valve element, and on the direction of blocking fluid input at the valve element valve element is applied bias force, along with hydrodynamic pressure increases, the valve element moves, and fluid input is communicated with fluid output.This controlling device also comprises installation elements, and it has the patchhole that inserts movably for valve chest.Installation elements has the introducing passage, and hydrodynamic pressure is directed into fluid input by this introducing passage.Installation elements also has discharge route, and hydrodynamic pressure is discharged from fluid output by this discharge route.Hydrodynamic pressure in introducing passage becomes when being equal to or greater than predetermined pressure, and valve chest outwards moves from the patchhole inboard with respect to patchhole, thereby limits bypass gap between valve chest and the installation elements, by it, introduces passage and communicates with discharge route.This controlling device also comprises the displacement regulon, and its limiting valve housing is with respect to the outside amount that moves of patchhole, to regulate bypass gap.

According to a further aspect in the invention, for installation elements is provided with a kind of control valve device, wherein is limited with and introduces passage and discharge route.This control valve device has modulating valve, and this modulating valve comprises valve chest, valve element, the connector that links to each other with valve chest and is compressed in biasing element between valve element and the connector.This valve chest has and introduces the fluid input that passage communicates.This valve chest also has the fluid output that communicates with discharge route.Valve chest holds the valve element of being exerted pressure by the hydrodynamic pressure in the fluid input.Biasing element opposing hydrodynamic pressure on the direction of valve element obstruction fluid input applies bias force to the valve element.Along with hydrodynamic pressure increases, valve element opposing bias force moves, so that fluid input communicates with fluid output, is used to reduce hydrodynamic pressure.When hydrodynamic pressure becomes when being equal to or greater than predetermined pressure, the valve element makes connector outwards move with respect to valve chest by biasing element, is applied to bias force on the valve element with minimizing, thereby reduces hydrodynamic pressure.This control valve device also comprises the displacement regulon, is used for by limiting moving of connector against connector, thereby regulates the minimizing of the bias force of biasing element.

Description of drawings

By the detailed description of carrying out below with reference to accompanying drawing, above-mentioned and other purposes of the present invention, feature and advantage will be more obvious, among the figure:

Fig. 1 shows the schematic representation according to first embodiment's joint-track type ejecting system;

Fig. 2 shows the schematic representation of the supply pump of this joint-track type ejecting system;

Fig. 3 shows the sectional view of the controlling device of this supply pump;

Fig. 4 shows the sectional view of the modulating valve of this controlling device;

Fig. 5 shows the sectional view according to second embodiment's controlling device;

Fig. 6 (a), 6 (b), 6 (c) show the sectional view of lid set on the valve chest according to the 3rd embodiment's modulating valve;

Fig. 7 (a), 7 (b) show the sectional view according to the 4th embodiment's controlling device; And

Fig. 8 shows the schematic representation according to the supply pump of prior art.

Embodiment

(first embodiment)

Joint-track type ejecting system shown in Figure 1 injects fuel into motor for example in each cylinder of diesel engine (not shown).Fuel injection system comprises common rail 1, sparger 2, supply pump 3, control unit of engine (ECU) 4, electronic drive unit (EDU) 5 etc.EDU5 can be located in the shell of ECU4.

Rail 1 constitutes storage vessel altogether, is wherein storing the fuel under high pressure that will be fed into sparger 2.Rail 1 links to each other with the discharge port of supply pump 3 by the high pressure pump line 6 that is used for the force feed fuel under high pressure altogether.Be total to cumulative stress (common rail pressure) in the rail 1.This common rail pressure is corresponding to fueling injection pressure.Rail 1 links to each other with a plurality of gun hoses 7 altogether, and by this gun hose, fuel under high pressure is fed into each sparger 2.

Also as pressure restrictor (reduction valve), it is installed in an end of common rail 1 to pressure regulator valve 8.When common rail pressure became greater than predetermined set pressure, the pressure restrictor internal communication so that fuel is turned back to the fuel tank 10 by releasing tube 9 from being total to rail 1, was equal to or less than this predetermined set pressure thereby limit common rail pressure.Pressure regulator valve 8 according to the indication work of ECU4 and EDU5 with internal communication, with quick minimizing common rail pressure.Can be independent of pressure regulator valve 8 and independent pressure restrictor is installed.

Common rail pressure sensor 11 is installed on the other end of common rail 1, to detect the wherein common rail pressure of accumulation.ECU4 is electrically connected with common rail pressure sensor 11, is used to receive the common rail pressure output signal from common rail pressure sensor 11.

Sparger 2 is installed on each cylinder of motor, so that fuel is sprayed onto in each cylinder.Each sparger 2 comprises nozzle and solenoid valve.Fuel nozzle links to each other with the downstream of each nozzle pipe 7, and this nozzle pipe is from being total to rail 1 branch.The fuel under high pressure that fuel nozzle will be stored in the common rail 1 is ejected in each cylinder.Solenoid valve carries out lifting control to the pin that is contained in the fuel nozzle.Residual fuel turns back to the fuel tank 10 from sparger 2 by releasing tube 9.Sparger 2 can be made of another kind of Fuelinjection nozzle, piezoelectric injector for example, and wherein piezoelectric actuator sprays control.

Supply pump 3 is a kind of high pressure fuel pumps, and it is by fuel filter 13 from fuel tank 10 suction of fuel of fuel pumping tube 12 in the middle of being located at.Supply pump 3 is fed in the common rail 1 with the fuel pressure of high pressure with suction.

As shown in Figure 2, supply pump 3 comprises feed pump 14, modulating valve 15, selects control valve (SCV) 16, at least one high-pressure service pump 17 etc.This embodiment shows an example, wherein is provided with two high-pressure service pumps 17.

ECU4 comprises a CPU and a storage unit, and this storage unit comprises storage device, for example ROM, RAM, SRAM and EEPROM.ECU4 is based on being stored in the program among the ROM and representing that the signal of vehicle operation state carries out various arithmetic processing processes.These signals are by using acquisition such as sensor and being stored among the RAM etc.

ECU4 determines the working state for each cylinder, for example the time of the structure of the target emitted dose of fuel, injection and operation sparger 2.ECU4 also determines and the aperture that supplies to the corresponding SCV16 of electric current of SCV16, as working condition.ECU4 indicates the sensor signal of vehicle operation state to wait to determine working condition based on being stored in the program among the ROM and being stored in being used among the RAM.

EDU5 comprises the sparger drive circuit.The sparger drive circuit supplies to driving current from the working signal of ECU4 the solenoid valve of sparger 2 based on transmission.The sparger drive circuit supplies to solenoid valve with driving current, thereby fuel under high pressure is injected in the cylinder.When the sparger drive circuit stopped to supply with driving current, fuel sprayed and stops.

Fig. 1 shows an example, and wherein the SCV drive circuitry arrangement is in the shell of ECU4.The SCV drive circuit supplies to the solenoid valve of SCV16 with driving current, for example as pwm signal.The SCV drive circuit can be arranged in the shell of EDU5.

Sensor is electrically connected with ECU4, is used to detect the working state of vehicle.These sensors comprise except being used to detect the common rail pressure sensor 11 of common rail pressure: be used to detect accelerator position accelerator sensor, be used for detection of engine speed velocity transducer, be used for the cooling-water temperature sensor of detection of engine cooling water temperature etc.

Then, with reference to figure 2 supply pump 3 is described.In this embodiment, supply pump 3 comprises feed pump 14, modulating valve 15, SCV16, two high-pressure service pumps 17 etc.Feed pump 14 is as low-pressure fuel pump, is used for by SCV16 from fuel tank 10 fuel-pumping to two high-pressure service pump 17.Feed pump 14 comprises the trochoid pump that is for example driven by camshaft 19, thereby camshaft 19 also is driven as the pump live axle by the bent axle that uses motor.

Controlling device comprises modulating valve 15, and it is used for regulating with predetermined feed pressure (being conditioned pressure) pressure of the outlet of feed pump 14.In the middle of modulating valve 15 was arranged in by fuel channel 20, this fuel channel made the outlet of feed pump 14 communicate with the low-pressure channel of feed pump 14.Modulating valve 15 is according to the head pressure of feed pump 14 and internal communication, turn back to the low-pressure channel of feed pump 14 to allow fuel meat ground from the outlet of feed pump 14, thereby modulating valve 15 is with the pressure in the outlet of predetermined feed pressure adjusting feed pump 14.

Fuel channel 20 is formed in the pump case 21 (installation elements) that limits supply pump 3 shells.Fuel channel 20 has the passage 22 of introducing and discharge route 23.Direct in the modulating valve 15 fuel meat that introducing passage 22 will be discharged from feed pump 14.The fuel that discharge route 23 will be discharged from modulating valve 15 directs into low-pressure channel for example in the suction channel of feed pump 14.

SCV16 is arranged in the centre of fuel channel 31, and by this fuel channel, fuel is guided the high-pressure service pump 17 from feed pump 14.SCV16 regulates the fuel quantity in the pressure chamber (plunger cavity) 32 that is drawn into high-pressure service pump 17, to regulate common rail pressure.SCV16 from the drive signal of ECU4 and controlled, is drawn into fuel quantity in pressure chamber 32 with adjusting by transmission, thereby regulates the fuel of force feed in the rail 1 altogether.SCV16 regulates by the discharge of the fuel of force feed in the rail 1 altogether, thereby regulates common rail pressure.

Two high-pressure service pumps 17 all are plunger pumps, and each all repeatedly aspirates and compressed fuel.In two high-pressure service pumps 17 each all will be reduced to high pressure by the fuel pressure that SCV16 supplies with, thereby high-pressure service pump 17 is fed into common rail 1 with fuel under high pressure.Two high-pressure service pumps 17 repeat the suction and the compression of fuel circularly, and these circulations differ the phase place of 180 degree each other.Each high-pressure service pump 17 is made of plunger 33, suction valve (one-way valve) 34 and expulsion valve (one-way valve) 35.Plunger 33 is by total camshaft 19 to-and-fro motion.Suction valve 34 supplies fuel in the pressure chamber 32, and the volume of this pressure chamber changes by the to-and-fro motion of each plunger 33.The fuel that expulsion valve 35 will compress in pressure chamber 32 is discharged to common rail 1.

Three or more high-pressure service pump 17 can be set.

Plunger 33 presses against on the cam ring 37 by spring 38.Cam ring 37 be installed in camshaft 19 eccentric cam 36 around.When camshaft 19 rotations, plunger 33 to-and-fro motion along with the eccentric motion of cam ring 37.When plunger 33 move towards camshaft 19 and pressure chamber 32 in pressure when reducing, expulsion valve 35 internal blockings, suction valve 34 internal communication, thereby be fed in the pressure chamber 32 by the fuel of SCV16 metering.When plunger 33 move away from camshaft 19 and pressure chamber 32 in pressure when increasing, suction valve 34 internal blockings.Fuel compresses in pressure chamber 32, thereby becomes when being equal to or greater than predetermined pressure expulsion valve 35 internal communication when fuel pressure.Therefore, the fuel under high pressure of supercharging is discharged towards being total to rail 1 in pressure chamber 32.In controlling device, modulating valve 15 is assembled on the pump case 21, is used for regulating with predetermined feed pressure the pressure of the outlet of feed pump 14.

Next with reference to figure 4 modulating valve 15 is described.

Modulating valve 15 comprises valve chest 44, valve element 45 and returning spring (biasing element) 47.Valve chest 44 has fluid input 41, fluid output 42 and breathes port 43.Valve element 45 is exerted pressure by the fuel pressure in the fluid input 41.Valve element 45 is supported in the valve chest 44, thereby valve element 45 can move axially, with the connection between regulated fluid inlet 41 and the fluid output 42.Valve element 45 comes connection between regulated fluid inlet 41 and the fluid output 42 according to the axial position of valve element.Returning spring 47 compression arrangement are between connector 46 and valve element 45, to make 45 biasings of valve element on the direction of blocking fluid input 41 at valve element 45.

Modulating valve 15 makes the connection between fluid input 41 and the fluid output 42 increase along with the increase that supplies to the fuel pressure in the fluid input 41, thereby with the pressure in 14 outlets of predetermined feed pressure adjusting feed pump.

Valve chest 44 is general cylindrical shape.Valve chest 44 has inner periphery, and cylindrical hole 51 passes this inner periphery and extends.Pump case 21 has patchhole 52 (Fig. 3).Valve chest 44 is assembled in the patchhole 52.

As shown in Figure 3, patchhole 52 comprises big footpath hole 52a, middle footpath hole 52b and path hole 52c, in this order from patchhole towards inside.Middle footpath hole 52b has the opening side of band female thread, and by it, modulating valve 15 is held on the pump case 21.Introducing passage 22 communicates with the cardinal principle center of the bottom surface of patchhole 52.Pressure in the outlet of feed pump 14 is directed into the fluid input 41 of modulating valve 15 by this introducing passage 22.

Limit an annular space between the axial intermediate portion of valve chest 44 and the patchhole 52.This annular space limits a fuel channel, its with fluid output 42, breathe between port 43 and the discharge route 23 and communicate.Two axial end portions of annular space are by being installed in O shape circle 54 sealings on the valve chest 44.

Valve stop member 55 is installed in the insertion end of the valve chest 44 in Fig. 3 left side.Fluid input 41 is formed on the cardinal principle center of valve stop member 55, communicates with the inside of valve chest 44 so that introduce passage 22.Valve element 45 limits a pressure regulating cavity α in the valve chest 44 of valve element 45 upstreams.

Fluid output 42 and breathing port 43 are formed in the valve chest 44.Fluid output 42 and breathing port 43 communicate with discharge route 23 by annular space.Fluid output 42 limits an opening, and it is regulated by valve element 45.Valve element 45 is by the pressure pressing among the pressure regulating cavity α, to slide in the valve chest 44.When the pressure of pressure regulating cavity α hanged down, the bias force of returning spring 47 was won, thereby valve element 45 blocks fluid outputs 42.Along with the pressure in the pressure regulating cavity α increases, valve element 45 is setovered towards returning spring 47 by the pressure among the pressure regulating cavity α, thereby the opening that limits in the fluid output 42 increases.Breathe port 43 and limit the respiration channel hole, to communicate with spring chamber β that is furnished with returning spring 47 and discharge route 23.

On valve chest 44, be formed with external screw thread 56.Be screwed in the female thread 53 of patchhole 52 by external screw thread 56 valve chests 44.Valve chest 44 is inserted into the patchhole 52 from the side that valve stop member 55 is installed.Instrument auxiliary section 57 (hexagonal portion, oval portion) is located at the outer end of valve chest 44.Workpiece auxiliary section 57 can be Hexagon, ellipse or the like.Instrument auxiliary section 57 is used for valve chest 44 is screwed to patchhole 52, thereby modulating valve 15 is assembled in the patchhole 52.

Valve element 45 is arranged in the cylindrical hole 51, has little gap therebetween.Valve element 45 is supported in the valve chest 44, can endwisely slip.Valve element 45 comes connected sum to block fluid output 42 according to the pressure balance in pressure among the pressure regulating cavity α and the returning spring 47.Connector 46 is cardinal principle cylindricalitys.Connector 46 is pressed the inboard of an end of the cylindrical hole 51 that is inserted in qualification instrument auxiliary section 57.Connector 46 is by press fit, thereby the fuel in the cylindrical hole 51 is restricted the outside that can not drain to tool part branch 57.Returning spring 47 for example is a coil spring, and its compression arrangement becomes between valve element 45 and connector 46.Returning spring 47 makes 45 biasings of valve element on the direction of valve element 45 obstruction fluid inputs 41.

Supply pump 3 may produce anomaly owing to the obstruction of the fuel filter 58 that is located at the fuel inlet place, the throttling of fuel pipe etc.Under abnormal state, the head pressure of fuel may apply bigger load, perhaps may produce anomaly and for example catch air in the fuel.When vehicle running hours under abnormal state, feed pressure may produce pulse.As a result, SCV16 shown in Figure 2 may damage, or the connector of SCV16 may be thrown off.

When fuel pressure produced pulse, the valve element 16a of SCV16 may be pulsed excessively, the result, and the spring 16b of SCV16 might rupture.When the spring 16b of SCV16 fracture, the aperture of SCV16 just can not be controlled.As a result, common rail pressure may increase unusually, may produce serious damage in motor of vehicle etc.

In this embodiment, modulating valve 15 comprises the connector (breech lock) 46 of press fit.Fuel pressure in fluid input 41 becomes and is equal to or greater than predetermined pressure, and be applied to axial load on the connector 46 by returning spring 47 and be increased to when setting load, connector 46 moves on the directions that connector 46 outwards moves with respect to valve chest 44 by this axial load.Under this situation, the setting load of returning spring 47 is reduced with respect to moving of valve chest 44 by connector 46.

Load when connector 46 is mobile outwardly with respect to valve chest 44 waits according to the material of press fit surplus, press fit length and valve chest 44 and connector 46 and sets.This load is corresponding to the intended fuel pressure in the fuel inlet.

Herein, the connector 46 of traditional modulating valve 15 only is used to support returning spring 47, and an end that blocks cylindrical hole 51.This traditional connector 46 can outwards not move with respect to cylindrical hole 51 wittingly.

When common-rail injection system was worked under abnormal state, feed pressure may produce pulse, under this abnormal state, owing to block throttling in fuel filter 58, the fuel pipe, air in the fuel is caught and is produced bigger load.

In this first embodiment, when causing fuel pressure in the fuel inlet 41 to be equal to or greater than predetermined pressure owing to the pulse of feed pressure under abnormal state etc., the directions (outward direction) that connector 46 outwards moves with respect to valve chest 44 at connector 46 go up and move.Therefore, the setting load (bias force) of returning spring 47 reduces, thereby the connection between fluid input 41 and the fluid output 42 increases, and the pressure of fluid input 41 reduces.Like this, the head pressure of feed pump 14 reduces.

In this operation, can be discharged to the common rail 1 from supply pump 3 by fuel limitation, thereby can regulate common rail pressure.As a result, engine power reduces, or motor stops.Thereby supply pump 3 can be protected and not produce damage, for example fracture of SCV16, thus motor can further be protected.

Connector 46 outwards moves with respect to valve chest 44, thereby only modulating valve 15 reduces on function.Can only keep in repair, thereby the maintenance cost of supply pump 3 can reduce by after removing the factor that causes high pressure conditions singularly, changing modulating valve 15.

In this embodiment, modulating valve comprises and covers 59 (displacement regulons).When connector 46 length outwards mobile with respect to valve chest 44 was increased to predetermined value, lid 59 was against connector 46, to limit the length that connector 46 outwards moves with respect to valve chest 44.Like this, lid 59 adjustings are corresponding to the described setting load of the bias force of returning spring 47.

For example the pressing process by sheet metal, corrosion resistant plate etc. make cover 59 form cup-shaped.Lid 59 is fixed to the outer periphery of the ring flange 60 of valve chest 44.Ring flange 60 abuts against on the step that is limited between big footpath hole 52a and the middle footpath hole 52b by press fit etc., or abuts against the inner periphery that limits big footpath hole 52a.

To be equal to or greater than predetermined pressure and connector 46 outside when mobile with respect to valve chest 44 when the hydrodynamic pressure in the fluid input 41 becomes, and the end face of connector 46 abuts against and covers 59 bottom surface.Connector 46 is restricted with respect to the length that valve chest 44 outwards moves, thereby defines the reduction of the setting load of returning spring 47.

When connector 46 moves on outward direction and the discharge capacity of supply pump 3 when reducing, the discharge capacity of supply pump 3 can be set at appropriate value.Therefore, engine power can reduce so that vehicle can rollback operation (withdrawal run), or be set at appropriate value by discharge capacity motor stopped supply pump 3.

In this embodiment, the lid 59 whole basically connectors 46 that cover are therein from the outwards mobile space of valve chest 44.Even outwards move and fuel when flowing out by the gap between cylindrical hole 51 and the connector 46 at connector 46, lid 59 fuel that also can limit outflow drain to and cover 59 outsides.Like this, can drain to the outside of supply pump 3 by fuel limitation, thereby firmly guarantee the Security of supply pump 3.

The interior outside of lid 59 can communicate with each other, thereby can find moving of connector 46 down by state in early days.Particularly, lid 59 can by for example substantially the plate of C tee section constitute rather than be cup-shaped, perhaps can in lid 59, small communication passage be set, can communicate thereby cover the 59 inboard and outsides.When connector 46 moves, cover in 59 the outside and be communicated with outside the fuel that cover in 59 can be drained to wittingly by making.

(second embodiment)

As shown in Figure 5, lid 59 comprises the bottom, wherein is limited with through hole 59a, is used to make cover outside connection in 59.Similar with first embodiment, when connector 46 was mobile on outward direction, connector 46 did not move on to and covers 59 outsides against the bottom surface of lid 59.

Through hole 59a is with respect to connector 46 coaxial settings substantially.Outside when mobile with respect to valve chest 44 when connector 46, motor may stop.Under this situation,, motor is temporarily worked by rod etc. being inserted among the through hole 59a so that connector 46 is pushed in the valve chest 44.Therefore, in this embodiment, connector 46 can be moved thereby vehicle can stably carry out rollback by past the pushing back from the outside.

(the 3rd embodiment)

As shown in Figure 6, lid 59 is fitted on the valve chest 44.Lid 59 is cup-shaped substantially, on the periphery that is fitted to instrument auxiliary section 57.Shown in Fig. 6 (a), instrument auxiliary section 57 is roughly ellipse, to limit parallel surperficial 57a, looks up from axle, and these surfaces toward each other.The oval top end of the instrument auxiliary section 57 in the left and right side of Fig. 6 (a) limits R portion (engagement head).

Lid 59 is formed by modular ratio valve chest 44 high soft materials, thereby covers 59 elastically deformables.Lid 59 can be formed cup-shaped substantially by foil.Lid 59 is installed to the periphery of instrument auxiliary section 57.Lid 59 is by forming compactings such as for example stainless steel processing.When lid 59 when being installed on the instrument auxiliary section 57, lid 59 is pressed on the instrument auxiliary section 57, being subjected to resiliently deformable, thereby is coupled on the instrument auxiliary section 57.Lid 59 has round the column part of instrument auxiliary section 57 peripheries.This column part of lid 59 is the general rectangular cylinder, has the turning of R shape.

Shown in the left and right directions of Fig. 6 (a), two facing surfaces of the column part of lid 59 have the hole of lid 59b respectively, and engagement head 57b can be coupled to this Gai Kongzhong respectively.Each lid hole 59b is communicated with window as the interior outside.Lid hole 59b is coupled on the engagement head 57b, thus cover 59 and valve chest 44 upwards all be fitted to each other with week in the axial direction, be limited and valve chest 44 disengagements thereby cover 59.

Shown in Fig. 6 (a) vertical direction, on lid 59 column part, be provided with projection 59c departing from the apparent surfaces of 90 degree with lid hole 59b.These projections 59c is inwardly outstanding, to be urged on the parallel surfaces 57a of instrument auxiliary section 57.Projection 59c is urged on the parallel surfaces 57c of instrument auxiliary section 57, covering 59 breech lock as being used to, and be used to make cover 59 can be owing to the vibration that is transferred to valve chest 44 produces mobile.

Shown in Fig. 6 (b) and 6 (c), the rib 59d of radially outward bifurcated is located on the whole periphery that covers 59 opening.Rib 59d has increased and has covered 59 rigidity.Rib 59d is also as inserting guide when lid 59 is installed on the instrument auxiliary section 57.Therefore, rib 59d be convenient to cover 59 with the installation process of instrument auxiliary section 57.The bottom of lid 59 centrally has described in a second embodiment through hole 59a at its cardinal principle core.

Lid 59 is placed on the instrument auxiliary section 57, and is pushed so that cover 59 against instrument auxiliary section 57, is assembled on the instrument auxiliary section 57 thereby cover 59.For example the lid 59 that is formed by thin slice is by resiliently deformable, and is fitted to the periphery of instrument auxiliary section 57.Lid hole 59b is coupled on the engagement head 57b, thereby also becomes and be difficult to leave instrument auxiliary section 57 even cover 59 when vibration transmission is on valve chest 44 and lid 59.

Effect among first, second embodiment can only be installed on traditional supply pump 3 by the lid 59 that will have the 3rd example structure and obtain.Therefore, when being applied to traditional supply pump 3, the 3rd embodiment's structure needn't transform traditional supply pump.

Instrument auxiliary section 57 is not limited to oval substantially.Lid 59 also can be installed on the instrument auxiliary section 57 of other shapes to cooperate with it.

The position of lid 59 is not limited to instrument auxiliary section 57, and lid 59 can be installed to any position of valve chest 44.

Lid 59 is not limited to cup-shaped, and lid 59 can be other shapes, and for example, the C tee section is to be coupled on the valve chest 44.

(the 4th embodiment)

In the controlling device according to first to the 3rd embodiment, when the fuel pressure in the fluid input 41 becomes when being equal to or greater than predetermined pressure, connector 46 outwards moves with respect to valve chest 44, to reduce the feed pressure of feed pump 14.

In this 4th embodiment, controlling device comprises bypass block.As shown in Figure 7, when the fuel pressure in introducing passage 22 becomes and is equal to or greater than predetermined pressure, utilize the fuel pressure of introducing in the passage 22, bypass block makes valve chest 44 outwards move with respect to patchhole 52.Under this state, bypass block outwards moves valve chest 44 on the direction axially outside substantially with respect to patchhole 52.Introduce passage 22 by communicating with discharge route 23 at axial bypass gap δ that axially forms between valve chest 44 and the pump case 21 and the annular bypass gap γ that between valve chest 44 and patchhole 52, radially forms.Therefore, can reduce the feed pressure of feed pump 14.

Bypass block comprises the housings support unit and second returning spring 62.The housings support unit on the direction that valve chest 44 is inserted at the sutaining valve housing 44 movably that inserts in the hole.Second returning spring, 62 compression arrangement become between screw plug (the spring breech lock) 61 and valve chest 44 that are fastened on the pump case 21.Second returning spring 62 is pushed at the top end of valve chest 44 on the direction of bottom of patchhole 52 and makes valve chest 44 biasings.

The external diameter of valve chest 44 is constant substantially.Omitted the O shape circle 54 among first embodiment.Female thread 53 is formed on the inner periphery of big footpath hole 52a.

The internal diameter that is formed on the path hole 52c in the pump case 21 is a bit larger tham the external diameter of valve chest 44.Valve chest 44 is supported among the 52c of path hole, thereby valve chest 44 can move axially at the inner periphery of Fig. 7 left and right directions upper edge path hole 52c.

In this 4th embodiment, cooperate connector 46a to be coupled in the internal circle groove in the cylindrical hole 51 that is defined in valve chest 44, to constitute the spring breech lock.Cooperate connector 46a to be fixed in the valve chest 44, thereby also can from valve chest 44, not shift out when being equal to or greater than predetermined pressure even cooperate the hydrodynamic pressure of connector 46a in fluid input 41 to become.

Second returning spring 62 is coil springs, and its compression arrangement is between valve chest 44 and screw plug 61.Valve stop member 55 is located at the top end of valve chest 44.Valve stop member 55 is pushed on the bottom surface of patchhole 52 through valve chest 44 by the bias force of second returning spring 62.

Annular seal element 63 is arranged between the bottom surface of valve stop member 55 and patchhole 52.With reference to figure 7 (a), when valve stop member 55 presses against on the bottom surface of patchhole 52, can not limit axial bypass gap δ between the bottom surface of valve stop member 55 and patchhole 52.In this case, can not introduce generation connection between passage 22 and the discharge route 23 by annular bypass gap γ basically.

Be applied to bias force on the valve chest 44 by second returning spring 62 and be pre the fuel pressure that makes in introducing passage 22 and become when being equal to or greater than predetermined value, valve chest 44 is by being applied in the pressure of introducing in the passage 22 and resisting the bias force of second returning spring 62 and mobile on outward direction.

Screw plug 61 is as cover element, and it is used to support the end of second returning spring 62, and is used to block patchhole 52.External screw thread 56 is formed on the outer periphery of screw plug 61.By external screw thread 56 is matched with the female thread 53 that is formed on 52a inboard, hole, big footpath, screw plug 61 is screwed in the pump case 21, thereby screw plug 61 is fixed on the pump case 21.Annular second seal element 64 is arranged between the bottom surface (surface with the level) of screw plug 61 and big footpath hole 52a.The fuel of second seal element, 64 restriction screw plugs, 61 inboards does not leak into the outside.

With reference to figure 7 (a), valve stop member 55 is located at the top end of valve chest 44.In the normal running of head pressure less than predetermined pressure of feed pump 14, by seal element 63, valve stop member 55 is urged on the bottom surface of patchhole 52 by the bias force of second returning spring 62.Valve element 45 is located in the valve chest 44.Valve element 45 is shifted according to the fuel pressure in the fluid input 41, with the connection between regulated fluid inlet 41 and the fluid output 42, thereby regulates feed pressure.

Be increased to when being equal to or greater than predetermined pressure when the head pressure of feed pump 14 increases and introduces fuel pressure in the passage 22, the pressure that is applied to modulating valve 15 from feed pump 14 outlets increases.In the case, shown in Fig. 7 (b), the pressure that is applied on the modulating valve 15 makes valve chest 44 resist bias force the moving to right at Fig. 7 (b) of second returning spring 62 on outward direction.Like this, the top end of the valve chest 44 on the left of Fig. 7 (a) becomes away from the bottom surface of patchhole 52, becomes the situation among Fig. 7 (b).Fuel directs in the discharge route 23 from introduce passage 22 by the annular bypass gap γ between axial bypass gap δ and valve chest 44 and the pump case 21.

Along with the displacement increase of valve element 45, the connection between fluid input 41 and the fluid output 42 becomes bigger, to reduce the head pressure of feed pump 14.Simultaneously, introduce passage 22 and discharge route 23 and communicate with each other, thereby the head pressure of feed pump 14 reduces by axial bypass gap δ and annular bypass gap γ.

The joint-track type ejecting system may be operated under abnormal state, under this state, because air of catching in the obstruction of fuel filter 58, the throttling in the fuel pipe, fuel etc. and can apply bigger discharge load.As a result, feed pressure may produce pulse.When pressure in the fuel inlet 41 being become be equal to or greater than predetermined pressure, valve chest 44 moves on outward direction.In this case, introduce passage 22 and discharge route 23 and communicate with each other, make the modulating valve internal communication simultaneously by axial bypass gap δ and annular bypass gap γ.Like this, feed pump 14 significantly reduces head pressure, thereby the fuel quantity that is discharged to the common rail 1 from supply pump 3 can be reduced.As a result, can regulate common rail pressure, thereby engine power reduces, or motor stops.In this operation, supply pump 3 can be protected and not produce damage, for example fracture of SCV16, and also motor also can be protected.

When the fuel pressure in introducing passage 22 was reduced to less than predetermined pressure, valve chest 44 automatically returned to initial position by the bias force of second returning spring 62, and in this position, axially bypass gap δ is eliminated basically.Therefore, in this structure, can only just can finish maintenance work, thereby the cost that is used for the maintenance intervention device is exactly unnecessary by removing the factor that produces abnormal pressure.

In this 4th embodiment, controlling device comprises the displacement regulon.Particularly, the length (shift length) that outwards move with respect to the patchhole 52 of pump case 21 when valve chest 44 are when being increased to predetermined length, valve chest 44 is against screw plug 61, in this case, shift length is restricted, thereby the connection of introducing between passage 22 and the discharge route 23 can be adjusted by axial bypass gap δ and annular bypass gap γ.

Especially, the connection of introducing between passage 22 and the discharge route 23 by annular bypass gap γ is determined by the length that path hole 52c and valve chest 44 and path hole 52c and valve chest 44 overlap each other in the axial direction.Even when the sectional area between path hole 52c and the valve chest 44 is constant substantially, the overlap length that path hole 52c and valve chest 44 overlap each other in the axial direction also can change, and the connection by annular bypass gap γ can change between passage 22 and the discharge route 23 thereby introduce.

In this 4th embodiment, the displacement regulon comprises the screw plug 61 that is installed on the pump case 21, and it covers valve chest 44 with respect to pump case 21 outside sections of moving.Restriction step 61a is formed on the inboard of screw plug 61, with when valve chest 44 shifts out from patchhole 52 against valve chest 44, shown in Fig. 7 (b).

Fuel pressure in introducing passage 22 becomes, and to be equal to or greater than predetermined pressure and valve chest 44 outside when mobile on outward direction with respect to patchhole 52, and the end face of the valve chest 44 on Fig. 7 (b) right side is against the restriction step 61a of screw plug 61.Valve chest 44 is restricted with respect to patchhole 52 axially movable shift lengths, and the connection by axial bypass gap δ and annular bypass gap γ is set between introducing passage 22 and the discharge route 23.Therefore, when moving axially the discharge capacity minimizing that makes supply pump 3 on outward direction by valve chest 44, the discharge capacity of supply pump 3 can be set to appropriate value, thereby engine power can be reduced to appropriate value, so that the motor rollback moves or stops.

(modification embodiment)

The foregoing description all illustrates, and structure wherein, structure and operational applications are in the supply pump 3 of joint-track type ejecting system.Said structure, structure and operation also can be applied to any other wherein adjusted controlling device of hydrodynamic pressure.

Its pressure is conditioned the fluid that device controls and is not limited to fuel.Fluid also can be any other fluid, the oiling agent that for example uses oil hydraulic pump to supply with.

Described embodiment's said structure can suitably make up.

Can under the prerequisite of spirit of the present invention the foregoing description not carried out various changes or replacement partially.

Claims

1. controlling device comprises:

Modulating valve (15), it comprises valve chest (44), the valve element (45) that can move, the connector (46) that links to each other with valve chest (44) and biasing element (47) in valve chest (44),

Wherein said valve chest (44) has fluid input (41) and fluid output (42),

Described valve element (45) is exerted pressure by the hydrodynamic pressure in the fluid input (41),

Described biasing element (47) is compressed between valve element (45) and the connector (46), on the direction of blocking fluid input (41) at valve element (45) valve element (45) being applied bias force,

Along with hydrodynamic pressure increases, described valve element (45) moves, so that fluid input (41) and fluid output (42) communicate, and

When hydrodynamic pressure becomes when being equal to or greater than predetermined pressure, biasing element (47) applies compressive load to connector (46), is used to make connector (46) to move with respect to valve chest (44) is outside, reducing the bias force of biasing element (47),

Described controlling device also comprises:

Displacement regulon (59),

When connector (46) during with respect to the outside mobile prearranging quatity of valve chest (44), displacement regulon (59) is used to limit moving of connector (46) against connector (46), with the reduction of the bias force of regulating biasing element (47).

2. controlling device according to claim 1 is characterized in that, also comprises:

Installation elements (21), described modulating valve (15) is provided thereon,

Wherein said connector (46) is press fit on the valve chest (44), and

Described displacement regulon (59) is a lid, and this lid is located on the installation elements (21), and to cover a part, by this part, connector (46) moves with respect to valve chest (44) is outside.

3. controlling device according to claim 2 is characterized in that, described displacement regulon (59) is fitted on the valve chest (44).

4. controlling device according to claim 3 is characterized in that, described valve chest (44) comprises instrument auxiliary section (57), this instrument auxiliary section comprise radially outstanding head (57b) and

Described displacement regulon (59) has hole (59b), and described head (57b) is coupled in this hole.

5. according to claim 3 or 4 described controlling devices, it is characterized in that,

Described valve chest (44) comprises instrument auxiliary section (57), and this instrument auxiliary section limits a pair of cardinal principle surface parallel to each other (57a), and

Described displacement regulon (59) comprises at least one projection (59c), and this projection bias voltage this at least one in (57a) of surface.

6. according to each described controlling device among the claim 1-4, it is characterized in that,

Described modulating valve (15) is located on the supply pump (3), and this supply pump comprises feed pump (14) and high-pressure service pump (17),

Feed pump (14) supplies to high-pressure service pump (17) with fuel from fuel tank (10),

High-pressure service pump (17) compresses fuel, with high-pressure fuel to the storage fuel under high pressure common rail (1) in, and

The fluid input (41) of modulating valve (15) links to each other with the outlet of feed pump (14), and the fluid output (42) of modulating valve (15) links to each other with the low-pressure channel of feed pump (14), with the head pressure of control feed pump (14).

7. controlling device comprises:

Modulating valve (15), it comprises valve chest (44), the valve element (45) that can move, the breech lock (46a) that links to each other with valve chest (44) and first biasing element (47) in valve chest (44),

Wherein valve chest (44) has fluid input (41) and fluid output (42),

Described first biasing element (47) is compressed between breech lock (46a) and the valve element (45), on the direction of blocking fluid input (41) at valve element (45) valve element (45) being applied bias force, and

Along with hydrodynamic pressure increases, valve element (45) moves, so that fluid input (41) communicates with fluid output (42),

Described controlling device also comprises:

Installation elements (21), it has patchhole (52), and valve chest (44) is inserted in this movably and is inserted in the hole,

Wherein said installation elements (21) has introducing passage (22), and hydrodynamic pressure is guided fluid input (41) by this introducing passage,

Described installation elements (21) also has discharge route (23), and hydrodynamic pressure discharges from fluid output (42) by this discharge route, and

When the hydrodynamic pressure in introducing passage (22) becomes and is equal to or greater than predetermined pressure, valve chest (44) outwards moves from patchhole (52) inboard with respect to patchhole (52), thereby limit bypass gap (γ, δ) between valve chest (44) and the installation elements (21), introducing passage (22) communicates with discharge route (23) by this bypass gap

Described controlling device also comprises:

Displacement regulon (61), its limiting valve housing (44) is with respect to the outside amount that moves of patchhole (52), to regulate bypass gap (γ, δ).

8. controlling device according to claim 7 is characterized in that,

Described valve chest (44) has top end, defines described fluid input (41) in the top end, and

Described patchhole (52) has the bottom surface, and this bottom surface communicates with introducing passage (22),

Described controlling device also comprises:

Second biasing element (62), it is compressed between displacement regulon (61) and the valve chest (44), on the direction of the bottom surface of patchhole (52) valve chest (44) is applied bias force with the top end bias voltage at valve chest (44),

Wherein displacement regulon (61) is located in the installation elements (21), and to cover a part, by this part, valve chest (44) moves with respect to installation elements (21) is outside.

9. according to claim 7 or 8 described controlling devices, it is characterized in that,

10. control valve device, it is arranged on the installation elements (21), is limited with to introduce passage (22) and discharge route (23) in this installation elements, and described control valve device comprises:

Modulating valve (15), it comprise valve chest (44), valve element (45), the connector (46) that links to each other with valve chest (44) and be compressed in valve element (45) and connector (46) between biasing element (47),

Wherein said valve chest (44) has fluid input (41) that communicates with introducing passage (22) and the fluid output (42) that communicates with discharge route (23),

Described valve chest (44) is holding the described valve element (45) of being exerted pressure by the hydrodynamic pressure in the fluid input (41),

Described biasing element (47) is resisted hydrodynamic pressure and valve element (45) is applied bias force on the direction of valve element (45) obstruction fluid input (41),

Along with hydrodynamic pressure increases, described valve element (45) is resisted bias force and is moved, so that fluid input (41) and fluid output (42) communicate, is used to reduce hydrodynamic pressure, and

When hydrodynamic pressure becomes when being equal to or greater than predetermined pressure, valve element (45) makes connector (46) move with respect to valve chest (44) is outside by biasing element (47), and impose on the bias force of valve element (45) with minimizing, thereby reduce hydrodynamic pressure,

Described control valve device also comprises:

Displacement regulon (59), it passes through to limit moving of connector (46) against connector (46), thus the reduction of regulating the bias force of biasing element (47).

11. control valve device according to claim 10 is characterized in that,

Described installation elements (21) limits the housing of supply pump (3), and described supply pump comprises feed pump (14) and high-pressure service pump (17),

The fluid input (41) of modulating valve (15) links to each other with the outlet of feed pump (14) by introducing passage (22), the fluid output (42) of modulating valve (15) links to each other with the inlet of feed pump (14) by discharge route (23), with the head pressure of control feed pump (14).