CN105201717A - High-pressure fuel pump for a fuel injection system - Google Patents
High-pressure fuel pump for a fuel injection system Download PDFInfo
- Publication number
- CN105201717A CN105201717A CN201510337176.0A CN201510337176A CN105201717A CN 105201717 A CN105201717 A CN 105201717A CN 201510337176 A CN201510337176 A CN 201510337176A CN 105201717 A CN105201717 A CN 105201717A
- Authority
- CN
- China
- Prior art keywords
- ring
- fuel pump
- pressure fuel
- slip ring
- live axle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0448—Sealing means, e.g. for shafts or housings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to a high-pressure fuel pump for a fuel injection system, in particular a common-rail injection system. The pump is provided with a drive shaft (1) which is supported in a bearing bore of the housing (3) of the high-pressure fuel pump in a rotatable manner; and a sealing arrangement (4) disposed between the drive shaft (1) and the housing (3). According to the invention, the sealing arrangement (4) is designed as a mechanical seal, which includes one with the drive shaft (1) rotating first seal ring (5) and a second seal ring (6) connected to the housing (3), wherein the first seal ring ( 5) is biased axially by the spring force of a spring element (7) against the second seal ring (6).
Description
Technical field
The present invention relates to a kind of high-pressure fuel pump, for fuel injection system, be particularly useful for common-rail injection system, this high-pressure fuel pump has feature as described in the preamble according to claim 1.
Background technique
Become known for the high-pressure fuel pump of fuel injection system from open source literature DE102011081852A1, this high-pressure fuel pump comprises the live axle in the supporting boring being rotatably supported in housing member.In order to prevent fuel leakage and/or oil from leaking, in described supporting boring, be furnished with the Simmer ring of at least one live axle that reclines.Preferably, be provided with two Simmer rings, first externally room in the sealed fuel pump of filling in these two Simmer rings, and in these two Simmer rings second to prevent motor oil to enter in pump room from outside.Guarantee the lubrication of the contact position of the second Simmer ring and live axle in order to ensure the functional of the second Simmer ring simultaneously, propose in that publication, discoidal splash-back is positioned at and is externally arranged in the second Simmer ring front, and this splash-back has multiple breakthrough part as the percolation opening for oiling agent, preferred oil.
The Seal Design with the radial shaft seal ring of one or more type mentioned above has such shortcoming usually: radial shaft seal ring is subject to high wearing and tearing in the length of life of pump.Because in the region of the contact position with live axle, radial shaft seal ring bears high dynamic load.Kindred circumstances is also suitable for the live axle in the region of the contact position with one or more Simmer ring.So, the abundant sealing of the length of life at pump is no longer guaranteed.Along with the fuel using the lubrication effect difference being used as oiling agent simultaneously, this risk increases.
Summary of the invention
The object of the invention is to: propose a kind of high-pressure fuel pump, for fuel injection system, especially common-rail injection system, this high-pressure fuel pump has the black box of the support region for sealing drive shaft, described black box durable and therefore guarantee reliable sealing in the length of life of high-pressure fuel pump.
This object is realized by the high-pressure fuel pump with the feature of claim 1.Favourable expansion scheme of the present invention is obtained by dependent claims.
The high-pressure fuel pump for fuel injection system, especially common-rail injection system advised comprises: can be bearing in the live axle in the supporting boring of the housing member of described high-pressure fuel pump rotationally; And the black box be arranged between described live axle and housing member.According to the present invention, sealing component structure is sliding-ring seal, and this sliding-ring seal comprises second slip ring be connected with housing member along with first slip ring and of described drive shaft turns.At this, the first slip ring by the spring force of spring element against described second slip ring in the axial direction by pretension.First slip ring compresses the second slip ring by this axial pre tightening force, thus the sealing force worked in the axial direction is applied to slip ring to upper, and sealing power realizes sealing reliably.At this, contact area in other words sealing station is arranged in the region of the end face of these two slip rings, thus only has these two slip rings to bear dynamic load when the operation of high-pressure fuel pump.Because, the first slip ring along with drive shaft turns and the second slip ring fix.Therefore, live axle is taking up wear not, and only has slip ring taking up wear in the contact areas.When slip ring weares and teares, relative to the second slip ring pretightening force in the axial direction, the first slip ring guarantees that enough extruding forces are to ensure required sealing.Therefore, this black box being configured to sliding-ring seal is proved to be extremely durable.
In addition, in order to improve serviceability, propose, the first slip ring and/or the second slip ring, preferably these two slip rings are made up of pottery at least in part.Because stupalith is wear-resistant especially.Especially propose, at least one slip ring fully or partly, namely at least with the contact area of another corresponding slip ring in be made up of silicon carbide (SiC).Therefore, the wearing and tearing in contact area minimally can be changed in the length of life of high-pressure fuel pump.
According to of the present invention one preferred embodiment, between the first slip ring and live axle, be furnished with sleeve, this sleeve is antitorque to be rotatably connected with live axle and to have the bending crimp regions for receiving and support described spring element.Bending crimp regions is such configuration preferably, and make to form the receiving chamber taken the shape of the letter U in cross-section, described spring element is received in this receiving chamber.Described spring element especially can be configured to helical compression spring, and this helical compression spring is supported on U-shaped receiving chamber bottom side on the one hand and is supported on the first slip ring on the other hand.In order to Transmit evenly power, supporting disk can be inserted between spring element and the first slip ring.
As the measure of expanding, propose, between sleeve and live axle, be furnished with seal ring.Sealing ring prevents the leakage by gap possible between described sleeve and live axle.Described seal ring preferably partly embeds in the circular groove of live axle and fixes for position in the axial direction.Because with the antitorque sleeve be rotatably connected of live axle along with drive shaft turns, so sealing ring does not bear dynamic load.
In addition, in order to prevent the leakage by gap possible between the first slip ring and sleeve, proposing, between the first slip ring and sleeve, being furnished with seal element.Sealing element is also configured to seal ring.Preferably, sealing componentry ground embeds in the first slip ring.For this reason, the first slip ring can become implement stepwise in inner circumferential side, to produce such as notch, this notch is open towards the end face deviating from the second slip ring.
Advantageously, the second slip ring is connected by support ring with housing member.This support ring is connected across the radial spacing between housing member and live axle, thus the end face of these two slip rings is substantially opposite and reach and contact with each other.In order to be fixed on housing member, this support ring is preferably in the multiple bending of radially outer.By described bending, this support ring is formed in the side axially extended, this support ring by described lateral support on housing member.
In order to prevent the leakage in the region that supports on housing member at support ring, proposing, between support ring and housing member, being furnished with seal ring.Sealing ring preferably partly embeds in the circular groove of housing member, thus the position of its axis given in advance.
In order to seal the contact area of described support ring and the second slip ring, preferably between support ring and the second slip ring, be furnished with seal element.Sealing element is such configuration preferably, makes sealing element hold the second slip ring at radially outer bag.That is, sealing element preferably in cross-section L shape ground configuration.In this way, sealing element in axis and can seal in the radial direction between support ring and the second slip ring.
Particularly preferably, housing member is flange component, and this flange component has the flange segments around sealing assembly.This flange segments protection black box is with from externalities.In order to support described support ring in the axial direction, this flange segments preferably becomes in inner circumferential side to be implemented stepwise.In addition, preferably flange segments has circular groove in inner circumferential side, and a snap ring is partly received in this circular groove and fixes for support ring position in the axial direction.This circular groove is preferably positioned at relative to the convex shoulder extended diametrically based on stair-stepping enforcement externally to be arranged, to realize the simple assembling of support ring from outside.
In addition, propose, live axle becomes to implement so that stop sleeve in the axial direction stepwise at outer circumferential side.Advantageously, live axle has the clutch head of side, and this clutch head is transitioned in columniform section by the section of taper configurations, and described sleeve is plugged on this columniform section.Then, another section with the outer diameter of increase is connected described columniform section.In the region of diameter steps, the support in the axial direction of described sleeve can be realized.In addition, preferably, described live axle has circular groove at outer circumferential side, and a snap ring is partly received in this circular groove and fixes for sleeve position in the axial direction.Again preferably, the circular groove for partly receiving snap ring is positioned at relative to diameter steps portion externally to be arranged, to realize the simple assembling of sleeve from outside.
The sliding-ring seal for high-pressure fuel pump according to the present invention proposed can substitute two Simmer rings, and described two Simmer rings are installed usually so that the support region of sealing drive shaft in this kind of pump.Be different from Simmer ring ground, described sliding-ring seal pump length of life almost without wear and tear.However, even if the little wearing and tearing of itself also can not cause blow-by.In addition, the return pressure of this system can be improved, such as, bring up to until 12bar (relatively).---when using the Simmer ring of radial effect---return pressure must be adjusted to maximum 1bar (relatively) at present, and this combines with significantly higher cost.
Accompanying drawing explanation
A preferred implementation of the present invention is explained in detail referring to accompanying drawing.Accompanying drawing illustrates the schematic longitudinal section of high-pressure fuel pump according to the present invention in the region of bearing.
Embodiment
Common-rail injection system in the accompanying drawings shown in according in high-pressure fuel pump of the present invention, this diagram is confined to the region of the support of the live axle 1 of this high-pressure fuel pump.
At present, live axle 1 is rotatably supported in the supporting boring 2 of housing member 3, and this housing member is configured to flange component.Flange component is fixed on the base house 24 of high-pressure fuel pump.Between the flange segments 16 and live axle 1 of this flange component, arrange black box 4, sealing assembly should prevent fuel from overflowing from high-pressure fuel pump and preventing motor oil from entering into high-pressure fuel pump on the other hand on the one hand.Black box 4 is configured to sliding-ring seal, and this sliding-ring seal comprises the first slip ring 5 and the second slip ring 6, described first slip ring and the second slip ring they mutual towards end face region in contact.Contact area 23 forms sealing station simultaneously, wherein, by being configured to the spring force of the spring element 7 of helical compression spring, described spring element is supported on the first slip ring 5 by supporting disk 22 indirectly, thus the first slip ring compresses the second slip ring 6 in the axial direction, guarantees the extruding force needed for the second slip ring.First slip ring 5 rotates along with live axle 1.Second slip ring 6 is fixing, thus contact area 23 bears dynamic load when high-pressure service pump runs.But because two slip rings 5,6 are being manufactured by silicon carbide (SiC) at present, the wearing and tearing in contact area 23 are little like this, make the effective sealing of the length of life guaranteed at high-pressure service pump.
In order to make the first slip ring 5 be connected with live axle 1, this first slip ring is arranged on sleeve 8.Sleeve 8 to be plugged on live axle 1 and to be rotatably connected with live axle is antitorque.First supporting of slip ring 5 on sleeve 8 is also torsion proof.In order to be sealed in the gap between sleeve 8 and live axle 1, arrange seal ring 10, sealing loop section ground embeds in the circular groove 11 of the outer circumferential side of live axle 1.Another is arranged between sleeve 8 and the first slip ring 5 in the annular seal element 21 of sealing, thus forbids the leakage between these two components further.In order to partly receive seal element 21, the first slip ring 5 becomes to implement stepwise in inner circumferential side.
Sleeve 8 has crimp regions 9, and this crimp regions bends and forms the receiving chamber for spring element 7 of U-shaped in cross-section in this way.The crimp regions 9 that supporting disk 22 is also bent surrounds.Crimp regions 9 constructs flange 25, and sleeve 8 is supported on live axle 1 in diameter steps region by this flange.In outside, the axial position of sleeve 8 is fixed by snap ring 20, and this snap ring inserts in the circular groove 19 of the outer circumferential side of live axle 1.
The second fixing slip ring 6 is connected with the flange segments 16 of housing member 3 by support ring 12.For this reason, the multiple bending ground of support ring 12 is implemented, thus support ring 12 is supported in flange segments 16 in inner circumferential side by the side extended in the axial direction.Between support ring 12 and flange segments 16, arrange seal ring 13, sealing ring inserts in the circular groove 14 of the inner circumferential side of flange segments 16.Seal ring 13 prevents by the leakage of support ring 12 with the contact area of the flange segments 16 of housing member 3.Fix to carry out axial position to support ring 12, this support ring abuts on the convex shoulder of the inner circumferential side of flange segments 16 on the one hand in the end regions of its bending.On the other hand, the axial position of support ring 12 is fixed by snap ring 18, and this snap ring inserts in the circular groove 17 of the inner circumferential side of flange segments 16.
Between support ring 12 and the second slip ring 6, arrange seal element 15, L shape sealing element is forming in cross-section and is holding the second slip ring 6 at outer circumferential side bag at present.In this way, seal element 15 realizes the sealing between support ring 12 and the second slip ring 6 in axis and radial direction.
In shown black box 4, when fuel high pressure pump operation, only these two slip rings 5,6 bear dynamic load, or rather only in contact area 23.Because seal ring 10,13 and seal element 15,21 are respectively the Sealing of the static state of not moving relative to component adjacent separately.Wearing and tearing can be made in this way minimally to change, thus black box 4 durable.Realize the reliable sealing of the length of life at high-pressure fuel pump in this way.
Claims (10)
1. for the high-pressure fuel pump of fuel injection system, especially common-rail injection system, it has: can be bearing in the live axle (1) in supporting boring (2) of the housing member (3) of described high-pressure fuel pump rotationally; And the black box (4) be arranged between described live axle (1) and described housing member (3),
It is characterized in that, described black box (4) is configured to sliding-ring seal, this sliding-ring seal comprises the first slip ring (5) rotated along with described live axle (1) and second slip ring (6) be connected with described housing member (3), wherein, described first slip ring (5) by the spring force of spring element (7) against described second slip ring (6) in the axial direction by pretension.
2. high-pressure fuel pump according to claim 1,
It is characterized in that, described first slip ring (5) and/or described second slip ring (6) at least in part by pottery, be preferably made up of silicon carbide.
3. high-pressure fuel pump according to claim 1 and 2,
It is characterized in that, between described first slip ring (5) and described live axle (1), be furnished with sleeve (8), this sleeve is antitorque to be rotatably connected with described live axle (1) and to have the bending crimp regions (9) for receiving and support described spring element (7).
4. high-pressure fuel pump according to claim 3,
It is characterized in that, between described sleeve (8) and described live axle (1), be furnished with seal ring (10), sealing ring preferably partly embeds in the circular groove (11) of described live axle (1).
5. the high-pressure fuel pump according to claim 3 or 4,
It is characterized in that, be furnished with seal element (21) between described first slip ring (5) and described sleeve (8), sealing element preferably embeds in described first slip ring (5).
6. the high-pressure fuel pump according to any one of the preceding claims,
It is characterized in that, described second slip ring (6) is connected by support ring (12) with described housing member (3), this support ring preferably in the multiple bending of radially outer to be fixed on described housing member (3).
7. high-pressure fuel pump according to claim 6,
It is characterized in that, between described support ring (12) and described housing member (3), be furnished with seal ring (13), sealing ring preferably partly embeds in the circular groove (14) of described housing member (3).
8. the high-pressure fuel pump according to claim 6 or 7,
It is characterized in that, be furnished with seal element (15) between described support ring (12) and described second slip ring (6), sealing element preferably holds described second slip ring (6) at radially outer bag.
9. the high-pressure fuel pump according to any one of the preceding claims,
It is characterized in that, described housing member (3) is flange component, this flange component has the flange segments (16) around described black box (4), this flange segments preferably becomes to implement stepwise in inner circumferential side, to support described support ring (12) in the axial direction, and, in addition, this flange segments preferably has circular groove (17) in inner circumferential side, a snap ring (18) is partly received in this circular groove (17) and fixes for described support ring (12) position in the axial direction.
10. the high-pressure fuel pump according to any one of the preceding claims,
It is characterized in that, described live axle (1) becomes at outer circumferential side to be implemented stepwise to support described sleeve (8) in the axial direction, and, described live axle preferably has circular groove (19) at outer circumferential side, and a snap ring (20) is partly received in this circular groove and fixes for described sleeve (8) position in the axial direction.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014211982.0 | 2014-06-23 | ||
| DE102014211982.0A DE102014211982A1 (en) | 2014-06-23 | 2014-06-23 | High-pressure fuel pump for a fuel injection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105201717A true CN105201717A (en) | 2015-12-30 |
| CN105201717B CN105201717B (en) | 2020-02-28 |
Family
ID=54767950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510337176.0A Expired - Fee Related CN105201717B (en) | 2014-06-23 | 2015-06-17 | High-pressure fuel pump for a fuel injection system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105201717B (en) |
| DE (1) | DE102014211982A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112955654A (en) * | 2018-10-23 | 2021-06-11 | 穆格股份有限公司 | Electro-hydrostatic drive with extended operating range |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1189207A (en) * | 1995-04-20 | 1998-07-29 | 德雷瑟-兰德公司 | Shaft seal |
| CN1314978A (en) * | 1999-04-23 | 2001-09-26 | 株式会社丰田自动织机制作所 | Mechanical seal for compressor |
| CN1453488A (en) * | 2002-04-24 | 2003-11-05 | 伊格尔工业股份有限公司 | Mechanical sealing apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011081852A1 (en) | 2011-08-31 | 2013-02-28 | Robert Bosch Gmbh | High-pressure fuel pump for fuel injection system particularly common rail injection system, has drive shaft rotatably mounted in bearing hole of housing part, where shaft sealing ring for preventing fuel leakage is arranged in bearing hole |
-
2014
- 2014-06-23 DE DE102014211982.0A patent/DE102014211982A1/en not_active Withdrawn
-
2015
- 2015-06-17 CN CN201510337176.0A patent/CN105201717B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1189207A (en) * | 1995-04-20 | 1998-07-29 | 德雷瑟-兰德公司 | Shaft seal |
| CN1314978A (en) * | 1999-04-23 | 2001-09-26 | 株式会社丰田自动织机制作所 | Mechanical seal for compressor |
| CN1453488A (en) * | 2002-04-24 | 2003-11-05 | 伊格尔工业股份有限公司 | Mechanical sealing apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112955654A (en) * | 2018-10-23 | 2021-06-11 | 穆格股份有限公司 | Electro-hydrostatic drive with extended operating range |
| US20210388826A1 (en) * | 2018-10-23 | 2021-12-16 | Moog Gmbh | Electrohydrostatic drive with an extended operating range |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102014211982A1 (en) | 2015-12-24 |
| CN105201717B (en) | 2020-02-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200228 |