CN102003319A - High-pressure fuel feed pump for high-pressure common-rail fuel injection system - Google Patents
High-pressure fuel feed pump for high-pressure common-rail fuel injection system Download PDFInfo
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Abstract
The invention discloses a high-pressure fuel feed pump for a high-pressure common-rail fuel injection system, which comprises a pump body, a plurality of fuel pumping units and fuel pumping unit driving parts, wherein each of the fuel pumping units comprises a valve body, a solenoid valve radially arranged on the upper part of the valve body, and a check valve axially arranged on the upper part of the valve body, and the outlet of the check valve is connected with a common-rail fuel pipe through a high-pressure fuel pipe and controls a second sealing conical surface on a valve core to match a first sealing conical surface on the valve body to form sealing. A plunger fuel hole and a high-pressure fuel cavity are communicated, and the communication port of the plunger fuel hole and the high-pressure fuel cavity is located between a valve plug part and a second check block. The check valve is a ball valve, and a steel ball in the ball valve and an outlet on the second end of a fuel outlet form a sealing when the ball valve is closed. The high-pressure fuel feed pump greatly reduces fuel leakage rate at high pressure, has increased fuel pumping efficiency and reduces workload of electromagnets.
Description
Technical field
The present invention relates to a kind of high-pressure fuel-feed pump of diesel engine, particularly a kind of high-pressure fuel-feed pump that is applied to high pressure common rail fuel injection system.
Background technique
Abroad, high pressure common rail fuel injection system has been a matured product.In today of economic globalization, China introduces external high pressure common rail fuel injection system in a large number.Wherein, international renowned companies such as BOSCH, DENSO, DELPHI and SIMENS are monopolizing the high-end market of domestic diesel fuel injection system.Domestic fuel injection system manufacturing company is setting about or the high pressure common rail fuel injection system developed is The foreign chicken products to be copied or made improvements slightly form mostly.This pattern in high-speeding, is faced with two kinds of risks: the one, can't evade the patent risk, and the 2nd, because the restriction of the bottleneck of key technology, the update of product can't be synchronous with turn of the market.
The Electrocontrolled high-pressure common rail fuel injection system satisfies the optimal selection of state three, state four or more maximum discharge standard as diesel engine, is made up of high-pressure fuel-feed pump, high pressure oil rail, electric-controlled fuel injector, ECU and sensor etc.In this system, the major function of high-pressure fuel-feed pump is periodically to provide enough fuel oils to high pressure oil rail, to guarantee the stability of fuel pressure in the high pressure oil rail.Its fuel feeding moment and fuel delivery size are controlled by ECU.By Der Grundsatz der Maschinen, high-pressure fuel-feed pump has plunger pump in upright arrangement and two kinds of patterns of radial rotor pump; Press control principle, control low pressure oil-feed and the fuel-displaced two kinds of patterns of control high pressure are arranged.In the mode of control low pressure oil-feed, its needed quantity control valve is restricting the development of this product always as technological difficulties, causes Products Development and development stagnation.In the fuel-displaced mode of control high pressure, when high pressure, fuel oil is easy to generate leakage, thereby causes that the oil temperature is high, the oily efficient of pump is low and defective such as the work of electromagnet load is big.
Chinese invention patent publication number CN101270715 discloses a kind of fuel feed pump of diesel engine high-pressure co-rail fuel oil system, it is the radial rotor pump, control principle is to adopt the oil-feed of meter in control valve control low pressure, it comprises the pump housing and pump head, be provided with transmission shaft in the pump housing, by the oil transfer pump of transmission shaft driven rotary, with the fixing mandrel of the pump housing, be enclosed within the outer column spinner plug sleeve of mandrel and be enclosed within the outer cam ring of column spinner plug sleeve, mandrel and transmission shaft coaxial line, transmission shaft is by the rotation of link driven rotary plunger bushing; Establish radially plunger hole and plunger in the column spinner plug sleeve; Cam ring is supported in the pump housing by the bearing with drive shaft axis off-centre; The cam ring inner chamber is provided with the elastic pressuring clamping device that plunger outer end and cam ring inner circumferential surface are compressed; The external peripheral surface of mandrel is established into and out of oily groove, during the rotation of column spinner plug sleeve, alternately is communicated with same plunger hole into and out of oily groove; The oil-feed groove is communicated with by the oil discharge passage of oil transportation channel with the oil transfer pump outlet port, and fuel-displaced groove is communicated with oil outlet by the mandrel oil road.This patent application is not described the meter in control valve.
Summary of the invention
Technical problem to be solved by this invention is easy to generate leakage at existing high-pressure fuel-feed pump fuel oil, thereby defective such as cause that oil temperature is high, the oily efficient of pump is low and the work of electromagnet load is big and a kind of high-pressure fuel-feed pump that is applied to high pressure common rail fuel injection system is provided, this high-pressure fuel-feed pump regularly provide enough fuel oils to high pressure oil rail, to guarantee the stability of fuel pressure in the high pressure oil rail.
Technical problem to be solved by this invention can be achieved through the following technical solutions:
A kind of high-pressure fuel-feed pump that is applied to high pressure common rail fuel injection system comprises the pump housing, some pumps oil unit and pump oil unit drives parts.Have some pump chambers and a pump oil unit drives parts working room in the described pump housing.Some pump chambers are positioned at the top of pump oil unit drives parts working room side by side.Described pump oil unit is installed in respectively in each pump chamber in mode arranged side by side.Described pump oil unit drives parts are installed in the pump oil unit drives parts working room and with the actuation gear power of motor and are connected, and the spin axis of these pump oil unit drives parts is vertical mutually with the axis of several pump oil unit; Described pump oil unit comprises valve body and radially is installed in the solenoid valve on valve body top and axially is installed in the one-way valve on valve body top; The outlet of described one-way valve is by high-pressure oil pipe rail oil pipe connection together; It is characterized in that, middle part in described valve body radially is provided with control spool mounting hole, high-voltage oil cavity, oil revolute chamber and fuel oil and portals, control spool mounting hole one end is communicated with described high-voltage oil cavity, is connected by the first sealing cone transition between described high-voltage oil cavity and the described control spool mounting hole; Middle part in described valve body is provided with the plunger oilhole; Described solenoid valve comprises electromagnet, control spool, first is adjusted cushion block, second and adjusted cushion block, and described electromagnet is adjusted cushion block by first and is installed in valve body top one side, and this electromagnet is controlled by ECU; Described second adjusts cushion block installs in the high-voltage oil cavity; Described control spool comprises a shaft-like spool portion and is positioned at the valve plug portion of spool portion first end, and described valve plug portion is connected by the second sealing cone transition with described spool portion, and second sealing cone cooperates formation to seal with described first sealing cone; Described plunger oilhole is communicated with high-voltage oil cavity and both connecting ports are adjusted between the cushion block in described valve plug portion and described second; First end that described fuel oil portals is communicated with one-way valve, and second end that fuel oil portals is communicated with described high-voltage oil cavity, and described one-way valve is a ball valve, and the portal outlet of second end of steel ball in the described ball valve and described fuel oil forms sealing when ball valve is closed.
Described plunger pump comprises a plunger, and the active section of described plunger is the polished rod structure, is coated with one deck composite deposit at the outer round surface of active section.
The profile of the valve plug portion of described control spool is outer six sides.
First adjusts cushion block is provided with rubber seal with the sealing surface that valve body contacts with electromagnet.
The described second adjustment cushion block is the multidiameter shaft shape, be provided with seal band between the periphery of the larger diameter end of the second adjustment cushion block and the interior ring cavity face of high-voltage oil cavity, have very little matching gap between the periphery of the smaller diameter end of the second adjustment cushion block and the interior ring cavity face of high-voltage oil cavity.
Owing to adopted technological scheme as above, high-pressure fuel-feed pump of the present invention can reduce the leakage rate of fuel oil when high pressure significantly, improves the pump oil efficient of oil feed pump and the working load of reduction electromagnet.
Description of drawings
Fig. 1 is the structural representation of high-pressure fuel-feed pump of the present invention.
Fig. 2 is the structural representation of pump oil of the present invention unit.
Fig. 3 is four cylinder camshaft structure schematic representation of high-pressure fuel-feed pump of the present invention.
Fig. 4 is the cam convex schematic representation on the four cylinder camshafts shown in Figure 3.
Fig. 5 is six cylinder camshaft structure schematic representation of high-pressure fuel-feed pump of the present invention.
Fig. 6 is the cam convex schematic representation on the six cylinder camshafts shown in Figure 5.
Fig. 7 position high-pressure fuel-feed pump working procedure first view of the present invention.
Fig. 8 is high-pressure fuel-feed pump working procedure second view of the present invention.
Fig. 9 is a high-pressure fuel-feed pump working procedure third state schematic representation of the present invention.
Figure 10 is a high-pressure fuel-feed pump working procedure four condition schematic representation of the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
Referring to Fig. 1, a kind of high-pressure fuel-feed pump that is applied to high pressure common rail fuel injection system shown in the figure, comprise a pump housing 100, the pump housing has the top that two pump chambers 110 and pump 120, two pump chambers in oil unit drives parts working room and 110 are positioned at pump oil unit drives parts working room 120 side by side.Be provided with a low pressure grease chamber 130 and oil inlet hole (among the figure for illustrating) on the top of the pump housing 100 and a pressure maintaining valve 140 is installed, low pressure grease chamber 130 is communicated with the outlet of oil inlet hole, and the outlet of oil inlet hole is connected with oil circuit; The inlet of pressure maintaining valve 140 is communicated with low pressure grease chamber 130, and the outlet of pressure maintaining valve 140 is connected with oil circuit, and when the oil pressure in the low pressure grease chamber 130 surpassed setting value, pressure maintaining valve 140 pressure releases were to keep the oil pressure in the low pressure grease chamber 130 stable.Be provided with a roller body component lubrication grease chamber 150 and two roller body component lubrication oilholes 160 in the middle and lower part of the pump housing 100, the inlet of two roller body component lubrication oilholes 160 is communicated with roller body component lubrication grease chamber 150, outlet is communicated with two pump chambers 110 respectively, partly in the oil chamber 150 lubricated fuel tap 160 is installed at roller body, lubricated fuel tap 160 is injected into lubricant oil in the roller body part oil chamber 150, be injected in the pump chamber 110 by two roller body component lubrication oilholes 160 then, to lubricate the roller body parts 410 of motion in pump chamber 110, in the bottom of roller body parts 410 roller 420 is installed, the cam 310 in roller 420 and the pump oil unit drives parts contacts.At the bottom of the pump housing 100 pump chamber 110 cam-position sensor 170 is installed, the signal teeth (not shown) on the camshaft 300 in the cam-position sensor 170 respective pump oil unit drives parts is in order to judge the phase place of two cams 310 respectively.Cam-position sensor 170 is connected with ECU (not shown) signal, and detected cam 310 phase signals are passed to ECU, with the pump oil moment of decision cam.
A pump oil unit 200 is installed in each pump chamber 110.Two pumps oil unit 200 is arranged side by side, in pump oil unit drives parts working room 120 pump oil unit drives parts 300 are installed, the spin axis of these pump oil unit drives parts 300 is vertical mutually with the axis of two pump oil unit 200, pump oil unit drives parts 300 are connected with the actuation gear power of motor, 200 work of driven pump oil unit.
Referring to Fig. 2, pump oil unit 200 comprises a valve body 210, valve body 210 bottom outer walls on the upper side direction be provided with a low pressure oil ring 211, this low pressure oil ring 211 constitutes a low pressure grease chamber 220 (referring to Fig. 1) with the locular wall of pump chamber 110.Low pressure grease chamber 130 on this low pressure grease chamber 220 and the pump housing 110 connects, and fuel oil just can enter into low pressure grease chamber 220 by low pressure grease chamber 130 like this.In the both sides up and down of low pressure oil ring 211 an O RunddichtringO 230 is installed respectively, to play the effect of sealing low pressure grease chamber 130 and low pressure grease chamber 220.
Be provided with axial plunger cavity 212 and oblique plunger oilhole 213 in the bottom of valve body 210.One end of plunger oilhole 213 and low pressure oil ring 211, just low pressure grease chamber 220 is communicated with, and the other end is communicated with plunger cavity 212, can utilize fuel oil that plunger 240 is lubricated like this.Plunger 230 from bottom to top is inserted in the plunger cavity 212, makes the plunger cavity on plunger 240 tops form a fuel oil chamber 212a.The lower end of plunger 240 is extended plunger cavity 212 and is connected in plunger valve spring seat 250, is with piston spring 260 in the bottom of valve body 210 and the bottom of plunger 220, and the lower end of this piston spring 260 contacts with piston spring seat 250.Piston spring seat 250 is inserted (referring to Fig. 1) in the roller body parts 410, is driven by roller body parts 410 to move upward, and roller body parts 410 are slidingly mounted on the bottom in the pump chamber 110 and are promoted to move upward by the cam 310 in the pump oil unit drives parts 300.Plunger cavity 212, plunger 240, piston spring 260, piston spring seat 250, roller body parts 410 constitute a plunger pump.
When roller body parts 410 move upward by piston spring seat 250 promotion plungers 240, piston spring 260 compressed energy-storages, when the cam 310 in the pump oil unit drives parts 300 loses the promotion of pair roller body component 410, piston spring 260 discharges, promote plunger 240 and piston spring seat 250 and move downward, realize the work cycle of a plunger pump.The active section of plunger 240 is the polished rod structure, is coated with the composite deposit of one deck high hardness at the active section cylindrical of plunger 240, and the frictional force when reducing plunger motion increases its wear resistance and improves its working life.
Middle part in valve body 210 radially is provided with control spool mounting hole 214, high-voltage oil cavity 215, oil revolute chamber 216.Control spool mounting hole 214 1 ends are communicated with high-voltage oil cavity 215, and the other end is communicated with oil revolute chamber 216, and high-voltage oil cavity 215 is connected by sealing cone 217 transition with controlling between the spool mounting hole 214.
Middle part in valve body 210 is provided with oblique fuel oil hand-hole 218 (referring to Fig. 7 to Figure 10), plunger oilhole 219, axial fuel oil portal 210a, oblique one-way valve spill port 210b.One end of fuel oil hand-hole 218 is communicated with low pressure grease chamber 220, and the other end is communicated with control spool mounting hole 214.One end of plunger oilhole 219 is communicated with fuel oil chamber 212a, and the other end is communicated with high-voltage oil cavity 215.
Be provided with an one-way valve installation cavity 210d on the top of valve body 210, the end of one-way valve spill port 210b is communicated with one-way valve installation cavity 210d, and the other end is communicated with oil revolute chamber 219.The portal inlet of 210a of fuel oil is communicated with high-voltage oil cavity 215, and the other end is communicated with one-way valve installation cavity 210d.
Be provided with an armature mounting hole 255c in adjusting cushion block 255, armature 253 is installed in the armature mounting hole 255c.
End at the close sealing cone 252c of the 252a of spool portion is provided with pressure oil annular groove 252d, in the 252a of spool portion, be provided with axial oil duct 252e and be respectively arranged with oilhole 252f, 252g at spool portion 252a two ends, oilhole 252f is communicated with oil duct 252e and pressure oil annular groove 252d, and oilhole 252g is communicated with oil duct 252e and oil revolute chamber 216.
The 252a of spool portion is slidingly mounted in the control spool mounting hole 214, valve plug portion 252b is positioned at high-voltage oil cavity 215, in high-voltage oil cavity 215, adjustment cushion block 256 is installed by plug screw 257, adjust the stroke of cushion block 256 in order to adjusting control valve core 252, what of fuel oil in the 212a of fuel oil chamber stroke by adjusting control valve core 252 and then can determine gap length between sealing cone 252c and the sealing cone 217 on the one hand, decision enter; The run duration between spool 252 primary importances and the second place is controlled in decision on the other hand.Adjusting cushion block 256 is the multidiameter shaft shape, be provided with the seal band (not shown) between the interior ring cavity face of the periphery of its larger diameter end and high-voltage oil cavity 215, and has very little matching gap between the interior ring cavity face of the periphery of smaller diameter end and high-voltage oil cavity 215, when making high-voltage oil cavity 215 interior high pressure fuels pass through matching gap, owing to throttling action produces pressure drop, improved sealing effect.
In addition, the port of plunger oilhole 219 is between valve plug portion 252b and adjustment cushion block 256, like this when electromagnet 251 outages, fuel pressure acts on the left side of valve plug portion 252b in the 212a of fuel oil chamber, its active force is far longer than the reaction force of electromagnet spring 254, and sealing cone 252c and sealing cone 217 are in sealing state all the time, therefore the working load of electromagnet 251 is reduced, the corresponding heat that is produced reduces, and life-span and reliability are greatly enhanced.
After the 252a of spool portion is slidingly mounted in the control spool mounting hole 214, form an annular pressure grease chamber 258 between the hole wall of pressure oil annular groove 252d and control spool mounting hole 214.
The other end of control spool 252 passes oil revolute chamber 219 and extend among the armature mounting hole 255c that adjusts in the cushion block 255 with armature 253 and be connected by fastening piece, electromagnet spring 254 is installed on the control spool 252 by electromagnet spring seat 259 and is positioned at oil revolute chamber 219, the spring pad 259a that the opposite side of electromagnet spring 254 is conflicted and is fixed on valve body 210 1 sides and is positioned at armature mounting hole 255c.
One-way valve 260 of the present invention is a ball valve, this ball valve comprises unidirectional valve plug 261, check valve spring seat 262, check valve spring 263 and steel ball 264, unidirectional valve plug 261 screws in the one-way valve installation cavity 210d, be provided with seal ring 261c between the two, be provided with axial fuel oil portal 261a and unidirectional valve pocket 261b in unidirectional valve plug 261 inside, the portal outlet of 261a of fuel oil connects rail oil pipe altogether by high-pressure oil pipe 510, and the rail oil pipe connects oil sprayer altogether.Owing to be provided with seal ring 261c between unidirectional valve plug 261 and the one-way valve installation cavity 210d, in order to prevent that remaining fuel oil produces erosion to sealing circle 261c among the one-way valve installation cavity 210d, middle part in valve body 210 is provided with oblique one-way valve spill port 210b, the end of this one-way valve spill port 210b is communicated with one-way valve installation cavity 210d, and the other end is communicated with oil revolute chamber 219.Remaining fuel oil just can be got back in the oil revolute chamber 219 in the one-way valve installation cavity 210d like this.
Check valve spring seat 262 is installed in the unidirectional valve pocket 261b, in check valve spring seat 262, be provided with an axial oil-through hole 262b, the portal inlet of 261a of the outlet of this oil-through hole 262b and fuel oil is communicated with, check valve spring 263 is enclosed within on the check valve spring seat 262, the lower end of this check valve spring 263 is pressed in fuel oil by spring lower seat 265 with steel ball 264 and portals in the outlet of 210a, steel ball 264 and spring lower seat 265 are arranged in unidirectional valve pocket 261b, the portal outlet of 210a of fuel oil is 90 ° of sealing cones, this conical surface carries out precision grinding processing, make it and steel ball 264 between form good sealing, thereby the leakage rate that fuel oil under high pressure produces is few, and pump oil efficient is greatly improved.
Referring to Fig. 3 and Fig. 4, pump oil unit drives parts shown in the figure are the pump oil unit drives parts 300a of corresponding four cylinder engine, these pump oil unit drives parts 300a comprises that a camshaft 320a and interval are installed in two cam 310a on the camshaft 320a, camshaft 320a is located in the pump oil unit drives parts working room, this camshaft 320a is connected with the actuation gear power of motor, and two cam 310a lay respectively at the below of two pump chambers; Cam 310a is two operating cams, has two convex point 311a, 312a, and two convex point 311a, 312a become 180 ° of layouts, and convex point 311a, 312a on two cam 310a misplace 90 °.Work as camshaft 320a like this and whenever revolve three-sixth turn, pump oil unit 200 pumps oil four times is consistent with motor oil spout frequency.
Referring to Fig. 5 and Fig. 6, pump oil unit drives parts shown in the figure are the pump oil unit drives parts 300b of corresponding six cylinder engine, these pump oil unit drives parts 300b comprises that a camshaft 320b and interval are installed in two cam 310b on the camshaft 320b, camshaft 320b is located in the pump oil unit drives parts working room, this camshaft 320b is connected with the actuation gear power of motor, and two cam 310b lay respectively at the below of two pump chambers; Cam 310b is three effect cams, has three convex point 311b, 312b, 313b, and three convex point 311b, 312b, 313b become 120 ° of layouts, and convex point 311b, the 312b on two cam 310b, 313b misplace 60 °.Work as camshaft 320a like this and whenever revolve three-sixth turn, pump oil unit 200 pumps oil six times is consistent with motor oil spout frequency.
The working procedure of the high-pressure fuel-feed pump of the corresponding four cylinder engine of the present invention is as follows: referring to Fig. 7, cam 310a is under the drive of the actuation gear of motor, rotatablely move by clockwise direction generation with certain rotating speed, a convex point 311a on the cam 310a leaves roller 420 gradually, under the effect of piston spring 260, promote plunger 240 descending thereupon (referring to Fig. 8), in the plunger 240 descending processes, drive roller 420 by roller body parts 410 and contact with cam 310a all the time.In plunger 240 descending processes, at this moment ECU500 control electromagnet 251 no electric circuits control spool 252 under the effect of electromagnet spring 254, and adjust cushion block 256 and contact and be in primary importance.At this moment, sealing cone 252c on the control spool 252 separates with the sealing cone of controlling in the spool mounting hole 214 217, produce the gap, and under the back pressure effect of the fuel oil in check valve spring 263 and common rail oil pipe 520 of the steel ball 264 in the one-way valve 260, steel ball 264 tightly withstands the portal outlet of 210a of fuel oil, and promptly one-way valve 260 is in closed condition.The fuel oil that comes from fuel oil hand-hole 218 enters in the 212a of fuel oil chamber by gap, the plunger oilhole 219 between the interior sealing cone 217 of the sealing cone 252c on annular pressure grease chamber 258, the control spool 252 and control spool mounting hole 214, enters the size (referring to Fig. 8) that how much depends on plunger 220 diameters and cam 310a lift of fuel oil chamber 212a intermediate fuel oil.
Referring to Fig. 9, cam 310a is under the drive of the actuation gear of motor, be rotated further by clockwise direction, plunger 240 rises along with the rotation of cam 310a, piston spring 260 is compressed gradually, in this process, ECU500 control electromagnet 251 no electric circuits, control spool 252 still is in and adjusts the primary importance that cushion block 256 contacts, sealing cone 252c on the control spool 252 separates with the sealing cone of controlling in the spool mounting hole 214 217, produce the gap, and under the back pressure effect of the fuel oil in check valve spring 263 and common rail oil pipe 520 of the steel ball 264 in the one-way valve 260, steel ball 264 tightly withstands the portal outlet of 210a of fuel oil, and promptly one-way valve 260 is in closed condition.Part fuel oil in the 212a of fuel oil chamber is back to low pressure grease chamber 220 (referring to Fig. 2) by the oilhole 252g (referring to Fig. 2) on the gap between the sealing cone 217 in sealing cone 252c on plunger oilhole 219, the control spool 252 and the control spool mounting hole 214, annular pressure grease chamber 258, the control spool 252, oil duct 252e (referring to Fig. 2), oilhole 252f (referring to Fig. 2) and the fuel oil hand-hole 218 in the 252a of spool portion (referring to Fig. 2) under the pushing of plunger 240.
Referring to Figure 10, cam 310a is under the drive of the actuation gear of motor, be rotated further by clockwise direction, plunger 240 rises along with the rotation of cam 310a, piston spring 260 is compressed gradually, in this process, electromagnet 251 energisings, the electromagnetic force that produces by armature 253 overcomes the resistance that plays electromagnet spring 254 makes control spool 252 to left movement, contact with sealing cone 217 in controlling spool mounting hole 214 up to the sealing cone 252c of control on the spool 252, control spool 252 and be in the second place this moment, fuel oil in the 212a of fuel oil chamber raises in the pushing downforce of plunger 240, when check valve spring 263 spring forces that the fuel pressure in the 212a of fuel oil chamber is born greater than steel ball 264 with altogether in the rail oil pipe 520 during the back pressure of fuel oil, fuel oil backs down steel ball 264, and the fuel oil in the 212a of fuel oil chamber is by plunger oilhole 219, high-voltage oil cavity 215, the fuel oil 210a that portals, oil-through hole 262b (referring to Fig. 2), the fuel oil 261a (referring to Fig. 2) that portals flows to rail oil pipe 520 altogether.Plunger 240 continues to rise, electromagnet 251 outages.At this moment, fuel pressure in the 212a of fuel oil chamber acts on the right side of control spool 252, its active force is far longer than the reaction force of electromagnet spring 254, sealing cone 252c on the control spool 252 continues to keep closing with the sealing cone of controlling in the spool mounting hole 214 217, and fuel oil under high pressure continues to flow to common rail oil pipe 520.When another convex point 311a on the cam 310a touched roller 420, plunger 220 ran to top dead center, and fuel feeding finishes, and under the effect of piston spring 240, plunger 220 is descending, entered next circulation.The energising and the power-off time of electromagnet 251 are controlled by ECU500.
The work characteristics of oil feed pump involved in the present invention is: the sealing surface in the 212a of fuel oil chamber is few, especially, good airproof performance between the interior sealing cone 217 of the sealing cone 252c of control on the spool 252 and control spool mounting hole 214 and steel ball 264 and the fuel oil good airproof performance between the outlet of 210a that portals, thereby the leakage rate that fuel oil under high pressure produces is few, and pump oil efficient is very high; Electromagnet 251 is in initial time energising work and keeps seldom a period of time, so that close fully between the sealing cone 217 in sealing cone 252c on the control spool 252 and the control spool mounting hole 214.Pressure in the 212a of fuel oil chamber is enough high, and when the power that acts on control spool 252 right sides can make the sealing cone 252c on the control valve core 252 seal fully with sealing cone 217 in the control spool mounting hole 214, electromagnet 251 outages were not worked.Thereby the working load of electromagnet 251 is little, and correspondingly, the heat of its generation is few, and its life-span and reliability improve greatly.
More than show and described basic principle of the present invention, major character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention has appending claims and equivalent thereof to define.
Claims (5)
1. high-pressure fuel-feed pump that is applied to high pressure common rail fuel injection system, comprise the pump housing, some pumps oil unit and pump oil unit drives parts, have some pump chambers and a pump oil unit drives parts working room in the described pump housing, some pump chambers are positioned at the top of pump oil unit drives parts working room side by side, described pump oil unit is installed in respectively in each pump chamber in mode arranged side by side, described pump oil unit drives parts are installed in the pump oil unit drives parts working room and with the actuation gear power of motor and are connected, and the spin axis of these pump oil unit drives parts is vertical mutually with the axis of several pump oil unit; Described pump oil unit comprises valve body and radially is installed in the solenoid valve on valve body top and axially is installed in the one-way valve on valve body top that high-pressure oil pipe rail oil pipe connection is together passed through in the outlet of described one-way valve; It is characterized in that, middle part in described valve body radially is provided with control spool mounting hole, high-voltage oil cavity, oil revolute chamber and fuel oil and portals, control spool mounting hole one end is communicated with described high-voltage oil cavity, is connected by the first sealing cone transition between described high-voltage oil cavity and the described control spool mounting hole; Middle part in described valve body is provided with the plunger oilhole; Described solenoid valve comprises electromagnet, control spool, first is adjusted cushion block, second and adjusted cushion block, and described electromagnet is adjusted cushion block by first and is installed in valve body top one side, and this electromagnet is controlled by ECU; Described second adjusts cushion block installs in the high-voltage oil cavity; Described control spool comprises a shaft-like spool portion and is positioned at the valve plug portion of spool portion first end, and described valve plug portion is connected by the second sealing cone transition with described spool portion, and second sealing cone cooperates formation to seal with described first sealing cone; Described plunger oilhole be communicated with high-voltage oil cavity and both connecting port between described valve plug portion and described second block; First end that described fuel oil portals is communicated with one-way valve, and second end that fuel oil portals is communicated with described high-voltage oil cavity, and described one-way valve is a ball valve, and the portal outlet of second end of steel ball in the described ball valve and described fuel oil forms sealing when ball valve is closed.
2. a kind of high-pressure fuel-feed pump that is applied to high pressure common rail fuel injection system as claimed in claim 1, it is characterized in that, described plunger pump comprises a plunger, and the active section of described plunger is the polished rod structure, is coated with one deck composite deposit at the outer round surface of active section.
3. a kind of high-pressure fuel-feed pump that is applied to high pressure common rail fuel injection system as claimed in claim 1 is characterized in that, the profile of the valve plug portion of described control spool is outer six sides.
4. a kind of high-pressure fuel-feed pump that is applied to high pressure common rail fuel injection system as claimed in claim 1 is characterized in that, first adjusts cushion block is provided with rubber seal with the sealing surface that valve body contacts with electromagnet.
5. a kind of high-pressure fuel-feed pump that is applied to high pressure common rail fuel injection system as claimed in claim 1, it is characterized in that, the described second adjustment cushion block is the multidiameter shaft shape, be provided with seal band between the periphery of the larger diameter end of the second adjustment cushion block and the interior ring cavity face of high-voltage oil cavity, have very little matching gap between the periphery of the smaller diameter end of the second adjustment cushion block and the interior ring cavity face of high-voltage oil cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105542643A CN102003319B (en) | 2010-11-19 | 2010-11-19 | High-pressure fuel feed pump for high-pressure common-rail fuel injection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105542643A CN102003319B (en) | 2010-11-19 | 2010-11-19 | High-pressure fuel feed pump for high-pressure common-rail fuel injection system |
Publications (2)
| Publication Number | Publication Date |
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| CN102003319A true CN102003319A (en) | 2011-04-06 |
| CN102003319B CN102003319B (en) | 2012-08-01 |
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| CN2010105542643A Active CN102003319B (en) | 2010-11-19 | 2010-11-19 | High-pressure fuel feed pump for high-pressure common-rail fuel injection system |
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| CN (1) | CN102003319B (en) |
Cited By (7)
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| CN103644057A (en) * | 2013-12-30 | 2014-03-19 | 南岳电控(衡阳)工业技术有限公司 | Fuel injector capable of injecting fuel to engine quantitatively at fixed time in controllable manner |
| CN104061100A (en) * | 2014-06-30 | 2014-09-24 | 南岳电控(衡阳)工业技术有限公司 | Sealing structure used in high-pressure fuel feed pump |
| CN104389709A (en) * | 2014-08-20 | 2015-03-04 | 南岳电控(衡阳)工业技术有限公司 | High-pressure fuel feed pump for high-pressure common rail fuel injection system |
| CN104533680A (en) * | 2014-12-30 | 2015-04-22 | 南岳电控(衡阳)工业技术有限公司 | Multiple-cylinder high pressure fuel feed pump for high pressure common rail fuel injection system |
| CN105610197A (en) * | 2016-01-15 | 2016-05-25 | 赵立增 | High-distributing precision diesel generator set capable of quickly starting automatic loading and unloading machine |
| CN110360041A (en) * | 2019-08-08 | 2019-10-22 | 思达耐精密机电（常熟）有限公司 | A kind of novel fuel pump for preventing oil sealing from leaking and detecting oil seal failure |
| CN112648121A (en) * | 2020-12-22 | 2021-04-13 | 东台市建东机械制造有限公司 | Fuel injection single-cylinder electric control pump of small air-cooled single-cylinder diesel engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103644057A (en) * | 2013-12-30 | 2014-03-19 | 南岳电控(衡阳)工业技术有限公司 | Fuel injector capable of injecting fuel to engine quantitatively at fixed time in controllable manner |
| CN103644057B (en) * | 2013-12-30 | 2017-05-03 | 南岳电控（衡阳）工业技术股份有限公司 | Fuel injector capable of injecting fuel to engine quantitatively at fixed time in controllable manner |
| CN104061100A (en) * | 2014-06-30 | 2014-09-24 | 南岳电控(衡阳)工业技术有限公司 | Sealing structure used in high-pressure fuel feed pump |
| CN104389709A (en) * | 2014-08-20 | 2015-03-04 | 南岳电控(衡阳)工业技术有限公司 | High-pressure fuel feed pump for high-pressure common rail fuel injection system |
| CN104389709B (en) * | 2014-08-20 | 2017-02-01 | 南岳电控（衡阳）工业技术股份有限公司 | High-pressure fuel feed pump for high-pressure common rail fuel injection system |
| CN104533680A (en) * | 2014-12-30 | 2015-04-22 | 南岳电控(衡阳)工业技术有限公司 | Multiple-cylinder high pressure fuel feed pump for high pressure common rail fuel injection system |
| CN105610197A (en) * | 2016-01-15 | 2016-05-25 | 赵立增 | High-distributing precision diesel generator set capable of quickly starting automatic loading and unloading machine |
| CN110360041A (en) * | 2019-08-08 | 2019-10-22 | 思达耐精密机电（常熟）有限公司 | A kind of novel fuel pump for preventing oil sealing from leaking and detecting oil seal failure |
| CN112648121A (en) * | 2020-12-22 | 2021-04-13 | 东台市建东机械制造有限公司 | Fuel injection single-cylinder electric control pump of small air-cooled single-cylinder diesel engine |
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