EP2137402A1 - High-pressure pump for delivering fuel comprising a torsion-decoupled compression spring element in the plunger unit - Google Patents
High-pressure pump for delivering fuel comprising a torsion-decoupled compression spring element in the plunger unitInfo
- Publication number
- EP2137402A1 EP2137402A1 EP08708238A EP08708238A EP2137402A1 EP 2137402 A1 EP2137402 A1 EP 2137402A1 EP 08708238 A EP08708238 A EP 08708238A EP 08708238 A EP08708238 A EP 08708238A EP 2137402 A1 EP2137402 A1 EP 2137402A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- compression spring
- contact surface
- spring element
- friction
- pressure pump
- 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
- 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
- F02M59/445—Selection of particular materials
-
- 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
-
- 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
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
- F02M59/26—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
-
- 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
Definitions
- High-pressure pump for conveying fuel with a torsion-decoupled compression spring element in the plunger device
- the present invention relates to a high pressure pump, in particular for conveying fuel for a common rail fuel injection system according to the preamble of
- Claim 1 further defined type.
- High-pressure pumps for conveying fuel which are suitable for common
- the high-pressure pumps are used to provide a high-pressure fuel within the common rail, which are acted upon by service bridges up to 2 Kbar and more. Therefore, special requirements are placed on the high-pressure pumps in order to promote the fuel in an efficient manner to the said pressures.
- the high-pressure pumps are usually driven via a coupling with the crankshaft of the internal combustion engine, wherein the high-pressure pump can be designed according to the principle of a cam drive. These include a camshaft having a cam geometry which displaces a picking element into a lifting movement in the direction of a lifting axis, and thus a pump piston connected to the picking element is set in a lifting movement.
- a introduced in a cylinder head valve gear can the
- the pump piston cooperate with this to promote the fuel.
- the pump piston is guided in a liftable manner in the pump body or in the cylinder head, and communicates with the tapping element at least via a roller shoe.
- the tapping element is usually designed as a roller, which rolls over the cam geometry. The arrangement of the roller in operative connection with the cam geometry is advantageous because between the roller and the
- Cam geometry forms a line contact, which has a high load capacity.
- only rolling movements take place, which are wear-minimized compared to sliding movements.
- the tapping element in the form of the roller is pressed to guide it on the cam geometry by means of a compression spring element against this, whereby at the same time the return stroke of the pump piston is ensured.
- Such compression spring elements are as
- linear guides Although this against rotation between the plunger device and the pump body in the form of linear guides are known, however, a sufficient accuracy is often not achievable. Also, linear guides have minimal play, which is comparatively large, and the line contact between the pick-off element and the cam geometry also remains unaffected. This circumstance leads to premature wear of the high pressure pump, which is undesirable in view of the required operating time and reliability of the high pressure pump.
- the invention includes the technical teaching that the at least one contact surface between the compression spring element and the plunger device and / or the adjoining surface of the compression spring element comprises a frictional force minimized surface coating to provide a Torsionsentkopplung the compression spring element.
- the advantage of the solution according to the invention lies in a decoupling of the torsional movement of the compression spring element from the plunger device.
- the accompanying during the compression of the compression spring element rotation of the same can not be transmitted to the plunger device at a contact surface with a friction-minimized surface coating, so that a rotation of the plunger device, and thus a rotation of the
- the Anyakinnelement is annular and has two opposing planar surfaces, so that a flat surface to the contact surface in the ram guide and the other flat surface to the end of the
- either the first plane surface, the opposite plane surface or both plane surfaces of the pressure disk element can be provided with a friction-minimized surface coating.
- the Anyakinnelement can also be connected on one side rotationally fixed to the compression spring element, so that a defined sliding movement of the opposite plane surface of the Anyakinnides can take place relative to the plunger guide. If the compression spring element is compressed, then a torsion in the compression spring element can be caused, which is compensated between the An réellelationnelement and the tappet guide.
- the tapping element is designed as a roller element and the tappet device further comprises a tappet guide with a roller shoe inserted into it, on which the contact surface is formed with the friction-minimized surface coating itself.
- the contact surface with the friction-minimized surface coating can be formed both on the pressure disk element and on the tappet guide itself, whereby a combination of the respective contact surfaces with a respective friction-minimized surface coating is possible.
- the advantage can be used to select different surface coatings, which slide on each other, so that a tribologically optimized friction pairing is formed.
- a spring disk element is arranged rotationally fixed thereto, which is flush with the contact surface of the tappet guide.
- the spring disk element can cohesively, positively or by means
- Connecting elements may be attached to the compression spring element, so that the spring disk element is also formed as a planar ring contour, and forms an annular contact surface.
- the adjacent to the contact surface of the tappet guide contact surface of the spring disk element comprises the frictional force minimized surface coating.
- the invention comprises both a spring disk element arranged at the end side on the pressure spring element and a pressure disk element, so that the pressure disk element is arranged between the spring disk element and the tappet guide, and the contact surface of the pressure spring element adjoins the contact surface of the spring disk element.
- four contact surfaces with a respective friction-minimized surface coating in a stack arrangement can adjoin one another, wherein the pressure-disk element is located between the spring-disk element and the tappet guide.
- the friction-minimized surface coating comprises a bonded coating and / or a dry lubricant applied to the contact surface.
- the friction-minimized Surface coating may also be a hard coating, such as a titanium oxide coating, a zirconium oxide coating, a silicon oxide coating, a titanium carbide coating or a titanium nitrite B coat. It is also possible to provide innovative PVD hard coatings such as TiMgN coatings. A combination of friction-minimized surface coatings and a surface-layer treatment of the respective contact surface should also be provided as an advantageous possibility within the scope of the present invention.
- Titanium carbide coatings which are characterized by a very high hardness, coupled with a low coefficient of friction and highest adhesion.
- Titanium nitrite coatings are characterized by high hardness, high toughness and a very low tendency
- the plunger device which comprises the compression spring element, is located inside the pump body, which is filled with fuel. Therefore, the fuel may act as a lubricant, so that the surface coating cooperates with the lubricating effect of the fuel. Therefore, the surface coating should have a corresponding resistance to the fuel, which is particularly a diesel fuel.
- a further surface coating may be called a titanium-aluminum nitride coating, wherein a chromium nitride coating is also a possible
- Hard material coating represents. These coatings are characterized in particular by a very high chemical and thermal stability, in which case the chromium nitrite coating has a low tendency to adhesion, since the arrangement of the compression spring element can have locally high surface pressures in operative connection with the pressure disk element or the spring disk element Adhesion tendency is advantageous.
- a frictional force-minimized surface coating in the form of a monolayer, wherein also binary layers (Ti (C, N)), multilayer coatings (TiC / TiN) or graded coatings (TiC / Ti (C, N) / TiN) represent a possible variant.
- the friction-minimized surface coating according to the invention is not limited to a specific layer system, but comprises several different layer systems.
- Fig. 1 is a cross-sectional view of a high-pressure pump with a plunger device and a compression spring element, a plunger guide with a roller shoe inserted and arranged between the compression spring element and the plunger guide
- FIG. 2 shows a cross-sectional view of the pressure-disk element according to the invention with a first and a second contact surface
- Fig. 3 is a cross-sectional view of the arrangement of the plunger device with respective contact surfaces according to the invention, wherein the compression spring element, the
- An horrinnelement and a spring washer element is shown in each case in a disassembled arrangement.
- Fig. 1 shows a cross-sectional side view of a high pressure pump 1, as used in common rail fuel injection systems for diesel engines.
- the high pressure pump
- the high-pressure pump 1 comprises a tapping element 2, which rolls over a cam geometry 3 arranged on a camshaft 3.
- the camshaft 3 is driven on the engine side, and comprises at least one cam geometry 4, wherein these includes one or more evenly distributed on the circumference arranged cams.
- the tapping element 2 exerts a lifting movement in the direction of a lifting axis 5, wherein the lifting movement of the tapping element 2 is transmitted to a tappet device 6.
- the tappet device 6 comprises a compression spring element 7 and a pump piston 12, wherein the tapping element 2 is received within a tappet guide 10, which together with the roller shoe 15 is also part of the tappet device 6.
- a An horrinnelement 9 is arranged, which is shown cross-cut and executed in the form of a face plate.
- the pump piston 12 which is guided within a cylinder head 13, and with a valve device in the cylinder head 13 extends to
- the high-pressure pump 1 essentially comprises a pump body 14, wherein the cylinder head 13 is placed sealingly on the pump body 14. Therefore, both the pump body 14 and the cylinder head 13, the guide means of the lifting movement of the plunger means 6 in the direction of the lifting axis 5, wherein a rotation of the plunger means 6 to prevent rotation about the
- Hubachse 5 is not shown in detail.
- Fig. 2 shows an enlarged view of the An réellelicniatas 9, which is - with regard to Fig. 1 - between the compression spring element and the tappet guide.
- the An réelleusionnelement 9 comprises a contact surface 8a according to the invention and an opposite further contact surface 8b, which has a frictional force-minimized surface coating.
- the An réelleusionnelement 9 extends annularly around the lifting axis 5, so that can extend through the An réelleludenelement 9 of the pump piston.
- the friction-minimized contact surfaces 8a and 8b respectively adjoin the compression spring element and the tappet guide, so that either the first contact surface 8a or the second contact surface 8b or both contact surfaces have the friction-minimized surface coating according to the invention.
- Fig. 3 shows a possible arrangement of a plunger device 6 according to the invention with a An horrinnelement 9, which between the plunger guide 10 and a
- Spring disk element 11 is arranged, wherein in the tappet guide 10 of the roller shoe 15 is used to receive the tapping element 2.
- the spring disk element 11 is brought into connection with the compression spring element 7, wherein the connection either cohesively (welding, soldering, gluing) or form-fitting (pressing, wedging or caulking) with is connected to the compression spring element.
- the spring disk element 11 may comprise a further contact surface 8d according to the invention, which likewise has a friction-minimized surface coating.
- a contact surface 8c located on the tappet guide 10, a contact surface 8c, which may also have a frictional force minimized surface coating.
- Fig. 3 is a An horrinnelement 9 between the
- the sliding movement comprises an oscillating rotational movement in small angular ranges, since at each stroke of the roller shoe 15, a torsion of the compression spring element 7 relative to the tappet guide 10 takes place.
- This rotation of the compression spring element 7 is thus compensated between the contact surfaces 8a, 8b, 8c and 8d, since the contact surfaces are minimized friction and allow a sliding movement to each other, the sliding causes minimal or even in connection with the lubricating effect of the fuel no significant frictional force.
- the Vercardne Trent of the compression spring element 7 is not transmitted to the tappet guide 10 so that it does not transmit the rotary motion further to the tapping element 2, and the line contact between the tapping element 2 and the cam geometry 4 is maintained on the camshaft 3.
- the invention is not limited in its execution to the above-mentioned preferred embodiment. Rather, a number of variants is conceivable which makes use of the illustrated solution even with fundamentally different types.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007012705A DE102007012705A1 (en) | 2007-03-16 | 2007-03-16 | High-pressure pump for conveying fuel with a torsion-decoupled compression spring element in the plunger device |
PCT/EP2008/050915 WO2008113626A1 (en) | 2007-03-16 | 2008-01-28 | High-pressure pump for delivering fuel comprising a torsion-decoupled compression spring element in the plunger unit |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2137402A1 true EP2137402A1 (en) | 2009-12-30 |
EP2137402B1 EP2137402B1 (en) | 2010-11-24 |
Family
ID=39434276
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08708238A Not-in-force EP2137402B1 (en) | 2007-03-16 | 2008-01-28 | High-pressure pump for delivering fuel comprising a torsion-decoupled compression spring element in the plunger unit |
Country Status (8)
Country | Link |
---|---|
US (1) | US20100101539A1 (en) |
EP (1) | EP2137402B1 (en) |
JP (1) | JP2010521620A (en) |
KR (1) | KR20090119977A (en) |
CN (1) | CN101636579B (en) |
AT (1) | ATE489554T1 (en) |
DE (2) | DE102007012705A1 (en) |
WO (1) | WO2008113626A1 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010001882A1 (en) * | 2010-02-12 | 2011-08-18 | Robert Bosch GmbH, 70469 | High-pressure fuel pump |
DE102010003886A1 (en) * | 2010-04-13 | 2011-10-13 | Robert Bosch Gmbh | high pressure pump |
DE102010020578A1 (en) | 2010-05-14 | 2011-11-17 | Bayerische Motoren Werke Aktiengesellschaft | Device for driving an auxiliary unit |
DE102010038468A1 (en) * | 2010-07-27 | 2012-02-02 | Robert Bosch Gmbh | high pressure pump |
DE102011077766A1 (en) * | 2011-06-17 | 2012-12-20 | Elringklinger Ag | Actuating device for an exhaust gas flow control of an exhaust gas turbocharger |
DE102011086703A1 (en) * | 2011-11-21 | 2013-05-23 | Robert Bosch Gmbh | high pressure pump |
CN102539056A (en) * | 2011-12-31 | 2012-07-04 | 北京理工大学 | Sliding bearing oil film pressure measuring device |
NL2010455C2 (en) * | 2013-03-14 | 2014-09-16 | Glind Metrology B V | Hydraulic pressure calibrator and calibration method. |
JP2018031333A (en) * | 2016-08-26 | 2018-03-01 | 日立オートモティブシステムズ株式会社 | High-pressure fuel pump |
JP7058505B2 (en) * | 2018-01-09 | 2022-04-22 | ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Fuel supply pump |
KR102228818B1 (en) * | 2019-09-17 | 2021-03-18 | (주)모토닉 | High pressure fuel pump and lpdi system with the same |
IT201900018122A1 (en) * | 2019-10-07 | 2021-04-07 | Bosch Gmbh Robert | PUMPING GROUP TO FEED A FLUID, IN PARTICULAR FUEL, PREFERABLY DIESEL, TO A USER, IN PARTICULAR AN INTERNAL COMBUSTION ENGINE |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3143073A1 (en) * | 1981-10-30 | 1983-05-11 | Robert Bosch Gmbh, 7000 Stuttgart | INJECTION PUMP WITH ADJUSTABLE SPRAYING POINT |
DE3624134A1 (en) * | 1986-07-17 | 1988-01-21 | Bosch Gmbh Robert | INJECTION PUMP |
DE4227853C2 (en) * | 1992-08-22 | 1996-05-30 | Bosch Gmbh Robert | Fuel injection pump for internal combustion engines |
DE4227854B4 (en) * | 1992-08-22 | 2005-12-15 | Robert Bosch Gmbh | Fuel injection pump for internal combustion engines |
US5239951A (en) * | 1992-11-12 | 1993-08-31 | Ford Motor Company | Valve lifter |
DE19829547C2 (en) * | 1998-07-02 | 2002-03-28 | Bosch Gmbh Robert | Radial piston pump |
DE10106983A1 (en) * | 2001-02-15 | 2002-08-29 | Ina Schaeffler Kg | tappet |
CN2627233Y (en) * | 2003-05-21 | 2004-07-21 | 上海东维燃油喷射有限公司 | Tappet unit with locating slot and without ferrule |
DE10345089A1 (en) * | 2003-09-26 | 2005-04-21 | Bosch Gmbh Robert | Plunger for a high pressure pump and high pressure pump with at least one plunger |
DE102004048711B4 (en) * | 2004-10-06 | 2006-09-14 | Siemens Ag | Radial piston pump with roller tappet |
US7311087B2 (en) * | 2004-11-23 | 2007-12-25 | Cummins Inc. | Fuel pump with a guided tappet assembly and methods for guiding and assembly |
-
2007
- 2007-03-16 DE DE102007012705A patent/DE102007012705A1/en not_active Withdrawn
-
2008
- 2008-01-28 CN CN2008800085036A patent/CN101636579B/en not_active Expired - Fee Related
- 2008-01-28 DE DE502008001897T patent/DE502008001897D1/en active Active
- 2008-01-28 KR KR1020097019255A patent/KR20090119977A/en not_active Application Discontinuation
- 2008-01-28 EP EP08708238A patent/EP2137402B1/en not_active Not-in-force
- 2008-01-28 AT AT08708238T patent/ATE489554T1/en active
- 2008-01-28 JP JP2009553984A patent/JP2010521620A/en active Pending
- 2008-01-28 US US12/531,642 patent/US20100101539A1/en not_active Abandoned
- 2008-01-28 WO PCT/EP2008/050915 patent/WO2008113626A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2008113626A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20100101539A1 (en) | 2010-04-29 |
EP2137402B1 (en) | 2010-11-24 |
CN101636579B (en) | 2011-10-05 |
ATE489554T1 (en) | 2010-12-15 |
CN101636579A (en) | 2010-01-27 |
KR20090119977A (en) | 2009-11-23 |
WO2008113626A1 (en) | 2008-09-25 |
DE102007012705A1 (en) | 2008-09-18 |
DE502008001897D1 (en) | 2011-01-05 |
JP2010521620A (en) | 2010-06-24 |
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