CN105065165B - The plunger and plunger matching parts of diesel injection pump - Google Patents
The plunger and plunger matching parts of diesel injection pump Download PDFInfo
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- CN105065165B CN105065165B CN201510491925.5A CN201510491925A CN105065165B CN 105065165 B CN105065165 B CN 105065165B CN 201510491925 A CN201510491925 A CN 201510491925A CN 105065165 B CN105065165 B CN 105065165B
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- plunger
- groove
- sealing surface
- injection pump
- cavity
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Abstract
The plunger of diesel injection pump, including a drive end（11）, a force feed end（13）An and sealing surface（12）, a plurality of groove is opened up on sealing surface（22）And it is distributed in the cavity for not opening up groove（24）The area sum that groove is formed with sealing surface intersection is the 5% to 35% of the circumferential theoretical surface of sealing surface, the depth of each groove gradually increases from it at force feed end at drive end, and the area sum that cavity is formed with sealing surface intersection is the 2% to 30% of the circumferential theoretical surface of sealing surface.Present invention also offers the plunger matching parts of injection pump, improves the lubrication between plunger and plunger bushing, phenomenon is killed caused by reduction, improve the sealing property under high-temperature and high-pressure conditions, reduce the leakage of fuel oil.
Description
Technical field
The present invention relates to the plunger and plunger matching parts of the injection pump of diesel engine, more particularly to diesel injection pump.
Background technology
Injection pump is the most important part of diesel engine, is considered as " heart " part of diesel engine.In diesel engine fuel injecting
In numerous parts of pump, plunger and plunger bushing are a pair of most important precision pairs in injection pump, primarily serve control oil spout
Amount and the effect for producing high injection pressure, its working environment are extremely severe.
Diesel engines at present injection pressure is generally up to more than 180MPa, and high pressure fuel easily passes through during plunger force feed
Clearance leakage between plunger and plunger bushing is into low tension loop, in order to realize super high injection pressure, in injection pump pumping cavity
Pressure is gradually lifted, and caused quantity of fuel leakage also sharply increases.
When high pressure fuel leak, pressure is converted into heat energy therewith, and plunger, because being heated to high temperature, makes with plunger bushing structural member
Fuel oil temperature raises once again, causes fuel-viscosity variation to decline, and its leakage rate further increases, and is consequently formed vicious circle.It is in addition, high
The kinematic viscosity of fuel oil deterioration and fuel oil caused by temperature declines and lubricant effect can be caused to be deteriorated so that between plunger and plunger bushing
Insufficient lubrication, both easily produce and kill phenomenon, substantially reduce the service life of injection pump.
The content of the invention
The purpose of the present invention is the lubrication between the plunger and plunger bushing for improving diesel injection pump, reduces plunger and plunger
Phenomenon is killed caused by set, and improves the sealing property between the plunger and plunger bushing under high-temperature and high-pressure conditions, reduces combustion
The leakage of oil.
Therefore, the invention provides a kind of plunger of diesel injection pump, it include a drive end, a force feed end,
With a sealing surface, open up a plurality of groove on sealing surface, the angle of the axis of groove and plunger is 30 ° to 70 °, each groove with it is close
The area sum that front cover intersection is formed is the 5% to 35% of the circumferential theoretical surface of sealing surface, and the depth of each groove is leaned on from it
Gradually increase at drive end at nearly force feed end, sealing surface does not open up groove and is then evenly equipped with cavity, cavity and sealing surface
The area that intersection is formed is the 2% to 30% of the circumferential theoretical surface of sealing surface.
In a kind of exemplary embodiment of the plunger of diesel injection pump, plural bar groove is parallel to each other.
In a kind of exemplary embodiment of the plunger of diesel injection pump, the length-width ratio of each groove is 2 to 6.
In another exemplary embodiment of the plunger of diesel injection pump, the bottom land of each groove intersects with sealing surface
The tangential angle at place is 10 ° to 45 °
In another exemplary embodiment of the plunger of diesel injection pump, the width of each groove is 10 μm to 30 μ
M,
A diameter of 10 μm to 50 μm of each cavity.
Present invention also offers a kind of plunger matching parts of diesel injection pump, and it includes a plunger of the invention and one
The plunger bushing of plunger is arranged, there is a radial clearance, wherein between the depth capacity and radial direction of cavity between plunger bushing and plunger
The ratio between gap is 0.4 to 5.3, and the ratio between the maximum cup depth of groove and radial clearance are 0.5 to 6.7.
Using the plunger and plunger matching parts of the present invention, in stroke press oil, the fuel oil in groove can be extruded, in plunger and
Produce high pressure between plunger bushing, form a high-pressure sealing chamber, with force feed caused by High-pressure phase equilibria, so as to realize the work of sealing
With；Simultaneously when plunger moves in plunger bushing, cavity help to be formed between plunger and plunger bushing with certain thickness and
The hydrodynamic lubrication oil film of bearing capacity, plunger is formed contactless slip with plunger bushing, greatly improve lubricating condition.This hair
The composite construction of bright cavity and varying depth groove, while improve lubrication and the sealing of plunger matching parts.
Brief description of the drawings
The following drawings only does schematic illustration and explanation to the present invention, not delimit the scope of the invention.
Fig. 1 is the schematic perspective view for illustrating the plunger of injection pump.
Fig. 2 is the plunger close-up schematic view shown in II in Fig. 1.
Fig. 3 is the schematic diagram of section shown in III-III lines in Fig. 1.
Fig. 4 is the schematic cross-sectional view for illustrating the plunger matching parts of injection pump.
Fig. 5 is the plunger matching parts part section enlarged diagram shown in V in Fig. 4.
Label declaration
10 plungers
11 drive ends
12 sealing surfaces
13 force feed ends
22 grooves
24 cavitys
30 plunger bushings.
Embodiment
In order to which the technical characteristic of invention, purpose and effect are more clearly understood, now control brief description of the drawings is of the invention
Embodiment, in the various figures identical label represent same or analogous part.Accompanying drawing is merely to illustrate the present invention, no
Represent the practical structures and actual proportions of the present invention.
Fig. 1 is the schematic perspective view for illustrating the plunger of injection pump, as shown in figure 1, the plunger 10 of diesel injection pump
Including 11, force feed ends 13 of a drive end and a sealing surface 12, a plurality of groove 22 is opened up on sealing surface 12, is being sealed
The opening position that face 12 does not open up groove 22 is then evenly equipped with cavity 24.In embodiment shown in the figure, the plural phase of bar groove 22
It is mutually parallel, it is easier to process, certainly difference according to the design needs, plural bar groove can also be not parallel to each other.
It can be 30 ° to 70 ° that the angle β of groove 22 and the axis of plunger on the sealing surface 12 of plunger, which is,.Fig. 2 is figure
Plunger close-up schematic view in 1 shown in II, as shown in Fig. 2 the width W of groove can be 10 μm to 30 μm, the length of groove
It can be 2 to 6 to spend the ratio between L and width W, and the area sum that each groove 22 is formed with the intersection of sealing surface 12 can be sealing surface 12
Circumferential theoretical surface 5% to 35%, the area sum that each cavity 24 and the intersection of sealing surface 12 are formed is sealing surface 12
The 2% to 30% of circumferential theoretical surface.The circumferential theoretical surface of sealing surface 12 refer to if do not have on sealing surface 12 groove and
Cavity, peripheral surface product when being made up of completely smooth surface.
In a kind of exemplary embodiment, a diameter of 7.5mm of plunger, five are offered on the sealing surface 12 of plunger
Groove 22, their angle β with plunger axis are 45 °, and the width W of each groove is 20 μm, the ratio between length L and width W of groove
For 4, the area that groove 22 is formed with the intersection of sealing surface 12 is the 22% of the circumferential theoretical surface of sealing surface 12, each cavity 24
It is a diameter of be 30 μm, the area sum that all cavitys and the intersection of sealing surface 12 are formed is the circumferential theoretical surface of sealing surface 12
Long-pending 25%.
Fig. 3 is the schematic diagram of the section shown in III-III lines along Fig. 1.As shown in figure 3, the sealing of the plunger in injection pump
On face 12, the depth of groove 22 is change, i.e., is arrived along it at force feed end 13 close to drive end 11, groove 22 is in plunger
Depth in the radial direction gradually increases.As pressed oil close at end 13, the depth of groove 22 is 0, and close to drive end
At 11, the depth of groove 22 is h3.For example, in a kind of exemplary embodiment, the depth h3 of groove 22 is 6 μm, groove 22
The tangential angle theta of bottom land 23 and the intersection of sealing surface 12 be 30 °.During fuel feed pump plunger force feed, this change of groove 22
Depth structure, the fuel oil for pressing to bottom land 22 can be made to be squeezed and produce preferable high pressure seal result, so as to effectively reduce combustion
Oil leakage quantity.
In other exemplary embodiments of the plunger of diesel injection pump, the angle β of groove 22 and plunger axis can
To hold in the range of 30 ° to 70 °, the width W of groove 22 can be in the range of 10 μm to 30 μm, and its length-width ratio can be 2
To in the range of 6, the bottom land 23 of groove 22 and the tangential angle theta of the intersection of sealing surface 12 can in the range of 10 ° to 45 °,
Fluted 22 with the intersection of sealing surface 12 formed areas for sealing surface 12 circumferential theoretical surface 5% to 35%；It is each recessed
A diameter of 10 μm to 50 μm of chamber 24, the area that all cavitys 24 are formed with the intersection of sealing surface 12 are managed for the circumferential of sealing surface 12
By the 2% to 30% of surface area.
Fig. 4 is the plunger of the schematic cross-sectional view for illustrating the plunger matching parts of injection pump, as shown in the figure diesel injection pump
Couple includes plunger 10 and plunger bushing 30.For the structure of plunger 10 as shown in figure 1, will not be repeated here, plunger bushing 30 is arranged plunger
10.Fig. 5 is the plunger matching parts close-up schematic view shown in V in Fig. 4, as shown in figure 5, it has a radial direction between plunger 10
The ratio between gap h2, the depth capacity h1 and radial clearance h2 of cavity 24 is 0.4 to 5.3.Such as in a kind of schematical embodiment party
In formula, the ratio between depth capacity h1 and radial clearance h2 of cavity 24 are 3.Each miniature cavity forms the stream with bearing capacity
Body dynamic pressure pressure, all cavitys can form hydrodynamic effect in macroscopically accumulation, and then improve the lubricious strip of plunger matching parts
Part.
In order to integrate the effect of groove 22 and cavity 24, reach preferably lubrication and sealing effectiveness, it is recessed referring to Fig. 3 and Fig. 5
The ratio between maximum cup depth h3 and radial clearance h2 of groove 22 are preferably in the range of 0.5 to 6.7.It is such as a kind of schematical real
Apply in mode, the ratio between maximum cup depth h3 and radial clearance h2 of groove 22 are 4.
Because the sealing surface of plunger opens up the groove 22 with concentration gradient, groove 24 can be extruded in stroke is pressed oil
Interior fuel oil, produces high pressure between plunger 10 and plunger bushing 30, forms a high-pressure sealing chamber, with force feed caused by high pressure phase
Balance, so as to realize the effect of sealing；When plunger 10 moves in plunger bushing 30, cavity 24 contributes in plunger 10 and plunger
The hydrodynamic lubrication oil film with certain thickness and bearing capacity is formed between set 30, plunger 10 is formed with plunger bushing 30 non-contact
Formula is slided, and greatly improves lubricating condition.The composite construction of cavity 24 and the groove 22 of varying depth, while improve plunger matching parts
Lubrication and sealing.
It should be appreciated that although this specification is described according to each embodiment, not each embodiment only includes one
Individual independent technical scheme, this narrating mode of specification is only that those skilled in the art will should say for clarity
Bright book is as an entirety, and the technical solutions in the various embodiments may also be suitably combined, and forming those skilled in the art can be with
The other embodiment of understanding.
Those listed above is a series of to describe illustrating only for possible embodiments of the invention in detail,
They simultaneously are not used to limit the scope of the invention, all equivalent embodiments made without departing from skill spirit of the present invention or change
It should be included in the scope of the protection.
Claims (5)
- A kind of 1. plunger of diesel injection pump（10）, the plunger includes a drive end（11）, a force feed end（13）And One sealing surface（12）, it is characterised in that：The sealing surface（12）Offer a plurality of groove（22）, the groove（22）Angle with the axis of the plunger be 30 ° extremely 70 °, each groove（22）With the sealing surface（12）The area sum that intersection is formed is the sealing surface（12）Circumference The 5% to 35% of theoretical surface, each groove（22）Depth from it close to the force feed end（13）Locate to close to the drive Moved end（11）Place's gradually increase；The sealing surface（12）The groove is not opened up（22）Place is evenly equipped with cavity（24）, the cavity（24）With the sealing surface （12）The area sum that intersection is formed is the sealing surface（12）Circumferential theoretical surface 2% to 30%；Each groove（22）Width be 10 μm to 30 μm, each cavity（24）A diameter of 10 μm to 50 μm.
- 2. the plunger of diesel injection pump as claimed in claim 1, wherein a plurality of groove（22）It is parallel to each other.
- 3. the plunger of diesel injection pump as claimed in claim 1, wherein each groove（22）Length-width ratio be 2 to 6.
- 4. the plunger of diesel injection pump as claimed in claim 1, wherein in each groove（22）Bottom land（23）With institute State sealing surface（12）The tangential angle of intersection is 10 ° to 45 °.
- 5. a kind of plunger matching parts of diesel injection pump, it includes：One plunger as any one of Claims 1-4（10）；WithOne is arranged the plunger（10）Plunger bushing（30）, itself and the plunger（10）Between there is a radial clearance（h2）；Wherein：The cavity（24）Depth capacity（h1）With the radial clearance（h2）The ratio between be 0.4 to 5.3,The groove（22）Maximum cup depth（h3）With the radial clearance（h2）The ratio between be 0.5 to 6.7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510491925.5A CN105065165B (en) | 2015-08-12 | 2015-08-12 | The plunger and plunger matching parts of diesel injection pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510491925.5A CN105065165B (en) | 2015-08-12 | 2015-08-12 | The plunger and plunger matching parts of diesel injection pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105065165A CN105065165A (en) | 2015-11-18 |
| CN105065165B true CN105065165B (en) | 2017-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510491925.5A Active CN105065165B (en) | 2015-08-12 | 2015-08-12 | The plunger and plunger matching parts of diesel injection pump |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107559185B (en) * | 2016-06-30 | 2021-01-12 | 罗伯特·博世有限公司 | Plunger pump and plunger for supplying fuel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2077034U (en) * | 1990-09-15 | 1991-05-15 | 上海柴油机厂 | Trunk piston diesel spray pump |
| US5630953A (en) * | 1993-05-13 | 1997-05-20 | Maschinenfabrik Gehring Gmbh & Co. | Method of fine-machining a workpiece surface to be supplied with a lubricant during operation of the workpiece |
| CN1959091A (en) * | 2006-08-25 | 2007-05-09 | 王德恒 | Oil saving piston of internal-combustion engine |
| CN202108686U (en) * | 2011-05-18 | 2012-01-11 | 加西贝拉压缩机有限公司 | Piston applied on a compressor |
| CN204921226U (en) * | 2015-08-12 | 2015-12-30 | 江苏大学 | Plunger and plunger matching parts of diesel engine injection pump |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2764353B2 (en) * | 1991-02-26 | 1998-06-11 | 株式会社豊田中央研究所 | Plunger of injection pump for alcohol fuel |
-
2015
- 2015-08-12 CN CN201510491925.5A patent/CN105065165B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2077034U (en) * | 1990-09-15 | 1991-05-15 | 上海柴油机厂 | Trunk piston diesel spray pump |
| US5630953A (en) * | 1993-05-13 | 1997-05-20 | Maschinenfabrik Gehring Gmbh & Co. | Method of fine-machining a workpiece surface to be supplied with a lubricant during operation of the workpiece |
| CN1959091A (en) * | 2006-08-25 | 2007-05-09 | 王德恒 | Oil saving piston of internal-combustion engine |
| CN202108686U (en) * | 2011-05-18 | 2012-01-11 | 加西贝拉压缩机有限公司 | Piston applied on a compressor |
| CN204921226U (en) * | 2015-08-12 | 2015-12-30 | 江苏大学 | Plunger and plunger matching parts of diesel engine injection pump |
Non-Patent Citations (1)
| Title |
|---|
| 缸套表面复合织构润滑性能理论及试验研究;尹必峰等;《西安交通大学学报》;20140618;第48卷(第9期);摘要，第2-3章节，图1-2、6 * |
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| CN105065165A (en) | 2015-11-18 |
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