CN104234897A - Plunger assembly for high pressure common rail pump - Google Patents
Plunger assembly for high pressure common rail pump Download PDFInfo
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- CN104234897A CN104234897A CN201310238947.1A CN201310238947A CN104234897A CN 104234897 A CN104234897 A CN 104234897A CN 201310238947 A CN201310238947 A CN 201310238947A CN 104234897 A CN104234897 A CN 104234897A
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- plunger
- common rail
- slide blocks
- high voltage
- plunger assembly
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Abstract
The invention discloses a plunger assembly for a high pressure common rail pump. The plunger assembly comprises three plungers, steel balls, springs and sliders. The plungers are arranged along the pump radially and evenly at intervals, and stepped through holes are formed inside the plungers; the steel balls are arranged in the through holes and are driven to connect to the stepped positions in an pressed manner through the springs, and are in seal fit with the stepped positions of the through holes; the springs are arranged in the through holes; the sliders are mounted between the tails of the plungers and a drive ring of a cam shaft, and the end faces of the tails of the plungers are fitted to the upper end faces of the sliders in a matched manner; the center of each slider is provided with a pore, and the fuel penetrates the pore to reach the position between the corresponding slider and the drive ring for lubrication. Thus, forced lubrication between the sliders and the drive ring can be performed, the durability of a kinematic pair is improved, and service life is prolonged.
Description
Technical field
The present invention relates to the high voltage common rail pump field of fuel injector, particularly a kind of plunger assembly of high voltage common rail pump.
Background technique
High voltage common rail pump is constituent element important in high pressure co-rail system, engine-driving high voltage common rail pump will be sent in common rail pipe after fuel pressurization, common rail pipe is installed oil sprayer and carries out fuel oil injection, this fuel system by the generation of jet pressure and course of injection completely separate from each other.
At present, the diesel-driven three cylinder radial plunger pumps of general employing produce high pressure fuel, the high voltage common rail pump of traditional arranged radially plunger, adopt piston spring to promote plunger and carry out oil suction campaign.In existing high voltage common rail pump, the lower end of plunger is designed to a plane, for installing piston spring; Or a design spring lower seat separately, plunger is connected with spring lower seat by bindiny mechanism.During installation, piston spring is enclosed within outside plunger bushing, and the locating face of spring upper end and the pump housing (or plunger bushing) is fitted and located, and the plane of orientation (or spring lower seat plane of orientation) of lower spring end and plunger lower end is fitted.When camshaft promotion plunger is up (plunger force feed), piston spring is also compressed simultaneously; Through atdc, under the elastic force effect of piston spring, promote plunger descending along cam-shaped line, complete oil-absorbing process.Claimant was once 2012103940912 for the above-mentioned technical problem number of filing an application, denomination of invention is the patent application of the oil absorption control device of high voltage common rail pump, as shown in Figure 1, the oil absorption control device of this high voltage common rail pump comprises plunger, driving ring and connects controls ring, described company controls the outside that ring is enclosed in described driving ring, the afterbody of described plunger sheathed and fix driving ring and connect control ring between, in the course of the work, afterbody and the described driving ring of described plunger have relative sliding.
But in above-mentioned patent application scheme, do not have sufficient oil film to lubricate between the afterbody of plunger and driving ring, kinematic pair easily weares and teares, even because temperature too high cause stuck.
Summary of the invention
The present invention is to overcome defect in above-mentioned prior art, provides a kind of plunger assembly of high voltage common rail pump, makes to lubricate fully between the afterbody of plunger and driving ring, improves durability and the working life of kinematic pair.
For achieving the above object, the invention provides a kind of plunger assembly of high voltage common rail pump, comprising: plunger body, its quantity is three and arranges along the radial uniform intervals of the pump housing, and plunger body inside is step-like through hole; Steel ball, steel ball is contained in through hole, and is sealed and matched with the ladder position of through hole; Spring, spring to be located in through hole and to drive steel ball to be connected to ladder position; Slide blocks, slide blocks is contained between the driving ring on plunger body afterbody and camshaft and the end face of plunger body afterbody and the upper-end surface of slide blocks and is sealed and matched; Be provided with pore in the middle of slide blocks, fuel oil is arrived between slide blocks and driving ring by pore and lubricates.
In technique scheme, the upper-end surface of slide blocks and the end face mating spherical surfaces of plunger body afterbody.
In technique scheme, the lower end surface of slide blocks is provided with circular groove.
In technique scheme, the lower end surface of slide blocks is also provided with oil guide slot, and oil guide slot is communicated with circular groove.
In technique scheme, the diameter of pore is Φ 0.5-Φ 0.8mm.
Compared with prior art, the present invention has following beneficial effect:
1. by the pore on the through hole of plunger body inside, slide blocks and steel ball with the use of, while guarantee plunger body is fuel oil press-in common rail pipe, carry out pressure lubrication between slide blocks and driving ring, the durability of raising kinematic pair and working life;
2. by designing through hole in plunger body, increasing the volume of plunger cavity, the dead volume of existing structure middle pump body plunger cavity can be reduced, improve the charge oil pressure of high voltage common rail pump;
3. the mating spherical surfaces of plunger body afterbody and slide blocks, both can play the effect of sealing, optimizes the force-bearing situation of plunger body simultaneously.
Accompanying drawing explanation
Fig. 1 is existing radial plunger high voltage common rail pump structural representation;
Fig. 2 is a kind of plunger assembly schematic diagram of high voltage common rail pump of the present invention;
Fig. 3 is the plunger assembly schematic diagram of another high voltage common rail pump of the present invention;
Fig. 4 is slide structural representation in the present invention;
Fig. 5 is the plan view of Fig. 4;
Fig. 6 is the schematic diagram that the present invention is assemblied in radial plunger high voltage common rail pump.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention not by the restriction of embodiment.
As shown in Figure 1, existing radial plunger high voltage common rail pump comprises the pump housing 01, plunger 02, camshaft 03, driving ring 04 and connects control ring 05.Particularly, plunger 02 quantity is three, and along the radial arrangement of pump body 01, three plungers 02 are arranged in 120 degree of angle uniform intervals; Eccentric camshaft 03 is arranged in oil pump central authorities (see Fig. 1, the center of camshaft 03 and the running shaft decentraction of the pump housing 01), (not shown) on the support zone that camshaft 03 two ends are arranged on oil pump two ends; The eccentric shaft of camshaft 03 is equipped with driving ring 04, driving ring 04 is processed with three planes, arrange in 120 degree of angles, each plane contacts with the slide 09 bottom plunger 02 all the time, and remains vertical with plunger 02, in the process that camshaft 03 rotates, eccentric shaft on camshaft 03 drives driving ring 04 to pump, and occurred level moves, when driving ring 04 action simultaneously, plane squeezing rod plug assembly on driving ring 04 moves reciprocatingly, and completes oil suction and force feed action; Connecting control ring 05, to be enclosed in driving ring 04 outside, and plunger tail is sheathed and fix at driving ring 04 and connect between control ring 05.Like this, three plungers 02 have been assembled on driving ring 04 by connecting control ring 05, when driving ring 04 is with camshaft 03 eccentric rotary, plunger 02 can realize moving up and down along with the rotation of camshaft 03 in plunger hole, completes the action of oil suction (moving downward), force feed (moving upward).
The working procedure of oil suction, force feed is as follows:
Plunger force feed stroke: camshaft 03 rotates up, driving ring 04 moves with camshaft 03, and the plane of driving ring 04 abuts against with the slide 09 coordinated bottom plunger 02, promotes plunger 02 and moves upward along plunger hole, thus complete force feed action.
Plunger oil suction stroke: when camshaft 03 is by after peak, camshaft 03 continues to rotate, driving ring 04 moves downward along with camshaft 03.Move downward together with driving ring 04 and two other plunger with control ring 05.The internal surface connecting control ring 05 contacts with connection supporting frame 08, and plunger 02 can be driven to have moved downward oil suction action.Due to the wobbler action of camshaft 03, along with cam axle, three plungers carry out the action of force feed, oil suction successively.Plunger head is provided with oil sucting valve 06 and oil suction valve seat 07, and when oil suction stroke starts, oil sucting valve 06 is in open mode, enters to make fuel oil.
The plunger assembly of high voltage common rail pump of the present invention is exactly improve plunger body and slide on the basis of above-mentioned base case, can in the working procedure of common rail pump, pressure lubrication is carried out to kinematic pair (slide and driving ring), meanwhile, reaches other beneficial effects.
As shown in Fig. 2,4 and 5, the plunger assembly of high voltage common rail pump of the present invention comprises plunger body 1, steel ball 2, spring 3 and slide blocks 4, the quantity of plunger body 1 is three and arranges along the radial uniform intervals of the pump housing, plunger body 1 inside is step-like through hole 11, the design of this through hole can increase the volume of plunger cavity, the dead volume of existing structure middle pump body plunger cavity can be reduced, improve the charge oil pressure of plunger pump, steel ball 2 is contained in through hole 11, and is sealed and matched with the ladder position 12 of through hole 11, spring 3 to be located in through hole 11 and to drive steel ball 2 to be connected on ladder position 12, slide blocks 4 is contained between the driving ring on plunger body afterbody and camshaft and the upper-end surface of the end face of plunger body afterbody and slide blocks 4 and is sealed and matched, pore 41 is provided with in the middle of slide blocks 4, fuel oil is arrived between slide blocks 4 and driving ring by pore 41 and lubricates, slide blocks 4 intermediate portion is provided with plane 42 and is used for mounting spring 3(see Fig. 4), establish circular groove 44 and oil guide slot 45(see Fig. 4 in lower end surface, Fig. 5), circular groove 44 and oil guide slot 45 are UNICOMs, fuel oil enters in circular groove 44 and oil guide slot 45 by pore 41, slide blocks 4 and driving ring are better lubricated.In the present embodiment, interior concave spherical surface 43 is provided with in the upper-end surface of slide blocks 4, correspondingly, plunger body tail end is designed to protruding sphere, it coordinates with the interior concave spherical surface 43 on slide blocks 4, when driving ring drives slide blocks 4 to extrude plunger body 1 on the protruding sphere of plunger body tail end and slide blocks 4 in concave spherical surface 43 play seal action, optimize the force-bearing situation of plunger body simultaneously.
Key point of the present invention is: the diameter of pore 41 is Φ 0.5-Φ 0.8mm, because the diameter of this pore 41 is enough little, carry out in the process of force feed at plunger, can not release rapidly in plunger cavity, its pressure is enough to make fuel oil pump in common rail pipe, meanwhile, small part fuel oil enters kinematic pair (slide blocks and driving ring) by pore 41 and carries out pressure lubrication, improves durability and the working life of kinematic pair.
As another kind of embodiment of the present invention, as shown in Figure 3, pore 41 can be designed as throttle orifice 41'.
In addition, the plunger assembly of high voltage common rail pump of the present invention is identical with prior art when loading in the pump housing, particularly, in plunger body 1 near bottom position, be provided with an annular groove (unmarked in figure), sheathed collar (unmarked in figure) in annular groove, plunger body 1 be connected supporting frame 08 and fixed by collar and connect, slide blocks 4 is compressed into and is connected supporting frame 08, and the upper-end surface of slide blocks 4 contacts with the lower end surface of plunger body afterbody, can be used for promoting plunger body 1 and moves.
As shown in Figure 6, the lower end surface of slide blocks 4 contacts with driving ring 04, can do horizontal fricting movement, and transmit the Driving force of driving ring 04 on driving ring 04; Connect control ring 05 to contact with the upper surface connecting supporting frame 08, three plunger assemblies are assemblied on driving ring 04, at driving ring 04 descending phase, connect control ring 05 and be responsible for pulling plunger 02 downwards, play the effect of plunger return.
According to above-mentioned oil suction, force feed working principle, when oil suction, ladder position 12 place that spring 3 drives steel ball 2 to be connected to through hole 11 seals plunger chamber, completes oil suction action.When force feed, steel ball 2 is opened, small part fuel oil is full of through hole 11 and enters between slide blocks 4 and driving ring 04 through pore 41 and carries out pressure lubrication, according to above-mentioned analysis, because the diameter of pore 41 is very little, the oil liquid pressure of plunger epicoele is enough to the leakage of the force feed process overcoming plunger itself, thus carries out accumulator valve to the common rail pipe in common rail system.
Be only specific embodiments of the invention above, but the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (5)
1. a plunger assembly for high voltage common rail pump, is characterized in that, comprising:
Plunger body, its quantity is three and arranges along the radial uniform intervals of the pump housing, and described plunger body inside is step-like through hole;
Steel ball, described steel ball is contained in described through hole, and is sealed and matched with the ladder position of described through hole;
Spring, described spring to be located in described through hole and to drive described steel ball to be connected to described ladder position;
Slide blocks, described slide blocks is contained between the driving ring on plunger body afterbody and camshaft, and the end face of described plunger body afterbody and the upper-end surface of described slide blocks are sealed and matched; Be provided with pore in the middle of described slide blocks, fuel oil is arrived between described slide blocks and described driving ring by described pore and lubricates.
2. the plunger assembly of high voltage common rail pump according to claim 1, is characterized in that, the upper-end surface of described slide blocks and the end face mating spherical surfaces of described plunger body afterbody.
3. the plunger assembly of high voltage common rail pump according to claim 1, is characterized in that, the lower end surface of described slide blocks is provided with circular groove.
4. the plunger assembly of high voltage common rail pump according to claim 3, is characterized in that, the lower end surface of described slide blocks is also provided with oil guide slot, and described oil guide slot is communicated with described circular groove.
5., according to the plunger assembly of the arbitrary described high voltage common rail pump of Claims 1-4, it is characterized in that, the diameter of described pore is Φ 0.5-Φ 0.8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310238947.1A CN104234897B (en) | 2013-06-17 | 2013-06-17 | The plunger assembly that high voltage common rail pump is used |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310238947.1A CN104234897B (en) | 2013-06-17 | 2013-06-17 | The plunger assembly that high voltage common rail pump is used |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104234897A true CN104234897A (en) | 2014-12-24 |
| CN104234897B CN104234897B (en) | 2016-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310238947.1A Active CN104234897B (en) | 2013-06-17 | 2013-06-17 | The plunger assembly that high voltage common rail pump is used |
Country Status (1)
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| CN (1) | CN104234897B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107084105A (en) * | 2017-06-28 | 2017-08-22 | 中国重汽集团重庆燃油喷射系统有限公司 | Impeller pump |
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| US5876186A (en) * | 1995-06-27 | 1999-03-02 | Robert Bosch Gmbh | High pressure pump for a fuel injection device |
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| DE19836901C2 (en) * | 1998-08-14 | 2002-08-29 | Bosch Gmbh Robert | Radial piston pump |
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| GB2391274B (en) * | 2002-07-05 | 2004-08-18 | Daimler Chrysler Ag | Production of lubricant reservoirs in a slide surface |
| EP1556606B1 (en) * | 2002-10-11 | 2006-09-06 | Robert Bosch GmbH | Radial piston pump for high pressure fuel supply |
| US20060216157A1 (en) * | 2003-06-14 | 2006-09-28 | Endress+ Hauser Gmbh + Co. Kg | Radial piston pump for providing high pressure in fuel injection systems of internal combustion engines |
| CN100429395C (en) * | 2002-10-31 | 2008-10-29 | 罗伯特·博世有限公司 | High-pressure fuel pump comprising a ball valve in the low-pressure inlet |
| CN201221449Y (en) * | 2008-04-18 | 2009-04-15 | 卢堃 | 180 Mpa electrohydraulic proportional control radial plunger pump |
| EP2530316A1 (en) * | 2011-06-02 | 2012-12-05 | Delphi Technologies Holding S.à.r.l. | Fuel pump lubrication |
| CN203321728U (en) * | 2013-06-17 | 2013-12-04 | 北京亚新科天纬油泵油嘴股份有限公司 | Plunger assembly for high-pressure common rail pump |
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2013
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Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3744380A (en) * | 1970-10-07 | 1973-07-10 | Sulzer Ag | Piston machine having radially disposed pistons |
| US5876186A (en) * | 1995-06-27 | 1999-03-02 | Robert Bosch Gmbh | High pressure pump for a fuel injection device |
| CN1101523C (en) * | 1996-12-23 | 2003-02-12 | 罗伯特·博希有限责任公司 | Fuel pluger pump for internal combustion ingine |
| US6077056A (en) * | 1997-02-12 | 2000-06-20 | Robert Bosch Gmbh | Reciprocating pump |
| DE19836901C2 (en) * | 1998-08-14 | 2002-08-29 | Bosch Gmbh Robert | Radial piston pump |
| US6582203B2 (en) * | 2000-06-02 | 2003-06-24 | Zf Batavia, L.L.C. | Radial piston pump |
| JP2002227761A (en) * | 2001-02-02 | 2002-08-14 | Ichimaru Giken:Kk | Radial plunger pump |
| GB2391274B (en) * | 2002-07-05 | 2004-08-18 | Daimler Chrysler Ag | Production of lubricant reservoirs in a slide surface |
| EP1556606B1 (en) * | 2002-10-11 | 2006-09-06 | Robert Bosch GmbH | Radial piston pump for high pressure fuel supply |
| CN100429395C (en) * | 2002-10-31 | 2008-10-29 | 罗伯特·博世有限公司 | High-pressure fuel pump comprising a ball valve in the low-pressure inlet |
| US20060216157A1 (en) * | 2003-06-14 | 2006-09-28 | Endress+ Hauser Gmbh + Co. Kg | Radial piston pump for providing high pressure in fuel injection systems of internal combustion engines |
| CN201221449Y (en) * | 2008-04-18 | 2009-04-15 | 卢堃 | 180 Mpa electrohydraulic proportional control radial plunger pump |
| EP2530316A1 (en) * | 2011-06-02 | 2012-12-05 | Delphi Technologies Holding S.à.r.l. | Fuel pump lubrication |
| CN203321728U (en) * | 2013-06-17 | 2013-12-04 | 北京亚新科天纬油泵油嘴股份有限公司 | Plunger assembly for high-pressure common rail pump |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107084105A (en) * | 2017-06-28 | 2017-08-22 | 中国重汽集团重庆燃油喷射系统有限公司 | Impeller pump |
| CN107084105B (en) * | 2017-06-28 | 2020-01-07 | 中国重汽集团重庆燃油喷射系统有限公司 | Rotor pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104234897B (en) | 2016-05-25 |
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Effective date of registration: 20180821 Address after: 300000 2 Yulong Road, automobile industrial park, Wuqing District, Tianjin Patentee after: North oil electronic control fuel injection system (Tianjin) Co., Ltd. Address before: No. three, Cheng Zhuang Road, Fengtai District, Beijing Patentee before: Beijing Yaxin Ketianwei Oil Pume Nozzle Tip Co., Ltd. |