EP2711546B1 - Stößelanordnung und Pumpe - Google Patents

Stößelanordnung und Pumpe Download PDF

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Publication number
EP2711546B1
EP2711546B1 EP12185586.0A EP12185586A EP2711546B1 EP 2711546 B1 EP2711546 B1 EP 2711546B1 EP 12185586 A EP12185586 A EP 12185586A EP 2711546 B1 EP2711546 B1 EP 2711546B1
Authority
EP
European Patent Office
Prior art keywords
roller
tappet
side surfaces
pump
arrangement
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.)
Active
Application number
EP12185586.0A
Other languages
English (en)
French (fr)
Other versions
EP2711546A1 (de
Inventor
Cristian Adrian Dr. Rosu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive GmbH
Original Assignee
Continental Automotive GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP12185586.0A priority Critical patent/EP2711546B1/de
Publication of EP2711546A1 publication Critical patent/EP2711546A1/de
Application granted granted Critical
Publication of EP2711546B1 publication Critical patent/EP2711546B1/de
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Anticipated expiration legal-status Critical

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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
    • F04B1/0413—Cams
    • 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
    • F04B1/0413—Cams
    • F04B1/0417—Cams consisting of two or more cylindrical elements, e.g. rollers
    • 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
    • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
    • 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
    • F04B1/0439—Supporting or guiding means for the pistons
    • 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

Definitions

  • the invention relates to a tappet arrangement for a high-pressure pump for the delivery of a fluid and a pump, see for example WO2010026463 with the closest prior art.
  • a high-pressure pump for the delivery of a fluid and a pump
  • a pump see for example WO2010026463 with the closest prior art.
  • common rail injection systems the fuel is delivered by means of a high pressure pump from a fuel tank to a fuel rail which serves as a storage reservoir for the fuel.
  • the fuel is under high pressure in the fuel rail (or common rail) and can be injected directly into the cylinders via injection valves connected to the rail.
  • a tappet arrangement for a high-pressure pump comprises a tappet body.
  • the tappet arrangement comprises a roller partly arranged in the tappet body.
  • the tappet arrangement further comprises a fixing for holding the roller and the tappet body to prevent a movement of the roller in the direction of the longitudinal axis of the roller.
  • the tappet body comprises two curved side surfaces arranged opposite to each other and aligned in the direction of the longitudinal axis of the roller for a movable coupling of the tappet arrangement with the pump housing of the high-pressure pump.
  • the tappet body is radiused only on two outside vertical sides along the roller.
  • the tappet arrangement is able to slightly rotate in its bore in the pump housing.
  • the tappet arrangement is able to self-align about its longitudinal axis, for example when the bore is not perfectly aligned with the position of a cam of a driveshaft of the pump. Further, a misalignment coming from the position and clearance of the bearings where the camshaft sits is compensated.
  • the tappet body comprises two flat side surfaces arranged opposite to each other aligned in the direction across the longitudinal axis of the roller.
  • the two end faces of the tappet arrangement are straight to limit the rotation of the tappet arrangement.
  • the fixing comprises two projecting parts that each are in contact with the roller to prevent a movement of the roller in the direction of the longitudinal axis of the roller.
  • the fixing comprises two contact points with the roller.
  • the fixing is designed to fit in position with the roller center to reduce the breaking torque of the roller.
  • the fixing comprises a tip at each of the two projecting parts that is in contact with the roller.
  • the fixing is made from a metallic material with elastic properties, for example brass.
  • a high-pressure pump for use in an internal combustion engine comprises a plunger for pressurizing fuel within a pump chamber of a pump housing during a plunger pumping stroke.
  • the pump comprises a driveshaft and the tappet arrangement.
  • the tappet arrangement is coupled with the plunger and the driveshaft for imparting drive from the driveshaft to the plunger to perform the plunger pumping stroke.
  • the pump housing comprises a bore.
  • the shape of a wall surrounding the bore corresponds with the shape of the two curved side surfaces and the two curved side surfaces each are in contact with the wall of the bore. Therefore, the tappet arrangement is able to slightly rotate with respect to the pump housing and to self-align with respect to the pump housing and the driveshaft.
  • the wall surrounds the bore such that the two flat side surfaces are arranged at a distance from the wall.
  • the rotation of the tappet arrangement with respect to the pump housing is limited to a given angle.
  • the tappet arrangement and the bore correspond to each other with a clearance given to provide the required maximum rotation degree of the tappet arrangement with respect to the pump housing.
  • the corners between the two curved side surfaces and the two flat side surfaces serve as rotation stops for the tappet arrangement.
  • the corners are free to travel on a circle circumscribed to the radiused edges for only the amount of space allowed by the clearance between the two flat side surfaces and the corresponding wall of the bore.
  • a tappet arrangement 100 comprises a tappet body 101 and a roller 102.
  • the roller is coupled with the tappet body 101 by a fixing 103.
  • the roller is coupled with the tappet body 101 such that the roller is able to rotate relative to the tappet body 101 about its longitudinal axis R.
  • the fixing 103 comprises two projecting parts 106. Each of the projecting parts 106 is coupled with a plane of the cylinder-shaped roller 102. For example, each of the projecting parts 106 comprises a point at the end that is in contact with the roller 102. The tip is in contact with the roller 102 in the roller center at the longitudinal axis R. Thus, the friction and the breaking torque between the roller 102 and the fixing 103 is reduced.
  • the fixing 103 is made from a metallic material with elastic properties, for example brass or other metallics.
  • the fixing 103 is a separate part to the tappet body 101 and, for example, is clipped on the tappet body 101.
  • the tappet body 101 comprises two curved side surfaces 104.
  • the curved side surfaces 104 are positioned opposite each other.
  • the curved side surfaces are convex.
  • the two curved side surfaces 104 are aligned in the direction of the longitudinal axis R of the roller 102 and in the direction of the longitudinal axis L of the tappet body.
  • the tappet body 101 further comprises two flat side surfaces 105 that are aligned in the direction across the longitudinal axis R of the roller 102 and in the direction of the longitudinal axis L of the tappet body 101.
  • the two flat side surfaces 105 each are in alignment with the two planes of the roller 102.
  • the two projecting parts 106 of the fixing 103 are arranged at the respective flat side surfaces 105. The two projecting parts 106 prevent the roller 102 from moving along its longitudinal axis R between the two flat side surfaces 105.
  • the roller 102 is able to rotate about its longitudinal axis R with respect to the tappet body 101 as well as the fixing 103 and is restrained from moving in the direction of the longitudinal axis R of the roller 102 and the longitudinal axis L of the tappet body 101.
  • the tappet body 101 comprises a recess 107 on a side 115 opposite the roller 102.
  • the recess is provided for coupling the tappet arrangement 100 with a plunger 110 ( FIG. 2 ) of the high-pressure pump.
  • the fixing 103 comprises a corresponding opening 108 such that the plunger 110 can reach through the fixing 103 into the recess 107.
  • FIG. 2 schematically shows a detail of a pump according to an aspect.
  • the pump comprises a housing 114 that surrounds a bore 112.
  • the bore 112 is surrounded by a wall 113.
  • the plunger 110 is mounted within the bore 112.
  • a driveshaft 111 is arranged.
  • the driveshaft 111 comprises an engine-driven cam. As the cam is driven in use, the plunger 110 is caused to reciprocate within the bore 112 and causes pressurization of fuel within a pump chamber defined at one end of the bore.
  • the coupling between the plunger 110 and the driveshaft 111 is realized by the tappet arrangement 100.
  • the tappet arrangement 100 is coupled with the driveshaft 111 or the cam with the roller 102.
  • the tappet arrangement 100 is coupled with the plunger 110 by means of the recess 107.
  • the wall 113 surrounds the bore with a shape that corresponds to the two flat side surface 105 and the two curved side surfaces 104.
  • the wall 113 comprises two sections that each have the same or nearly the same radius as the two curved side surfaces 104. Each of the two curved side surfaces 104 is in contact with one section of the curved sections of the wall 113.
  • the tappet arrangement 100 moves inside the bore 112 along the longitudinal axis L of the tappet body 101 guided by the two curved side surfaces 104 that slide along the wall 113.
  • the two flat side surfaces 105 are arranged at a distance from the corresponding sections of the wall 113. Therefore, the tappet arrangement 100 is able to self-align its alignment with respect to the pump housing 114.
  • the tappet arrangement 100 is able to rotate about its longitudinal axis L due to the curved side surfaces and the corresponding curved sections of the wall 113.
  • the two flat side surfaces 105 and the corresponding sections of the wall 113 limit the rotation of the tappet arrangement 100.
  • the distance between the flat side surfaces 105 and the wall 113 defines the given maximum angle of rotation of the tappet arrangement 100.
  • the tappet arrangement 100 slides in the bore 112 that is machined directly in the housing 114 and has the corresponding shape in the cross-section as the tappet body 101.
  • the bore 112 comprises a coating on the wall 113 for reducing friction, for example PEEK, PTFE and/or their derivates.
  • the bore 112 comprises a separate sleeve (not shown) inserted in which the tappet arrangement 100 is arranged and movable.
  • the wall 113 is heat treated to a desired given hardness, for example with aluminum anodising.
  • the movement of the tappet arrangement 100 in the direction of the longitudinal axis R of the roller 102 is constrained by the coupling of the tappet arrangement 100 with the plunger 110 in the recess 107.
  • the plunger is arranged inside the recess 107 with a small clearance.
  • the plunger 110 itself is constrained by a given clearance in its bore 112 making the plunger 110 to run in a given axial position.
  • the clearance between the plunger 110 and the tappet arrangement 100 is necessary to compensate a misalignment of the roller 102 with respect to the cam or the driveshaft 111 due to the position of the bearings on which the driveshaft 111 sits.
  • the radius on the curved side surfaces 104 in combination with the clearance between the flat side surfaces 105 and the wall 113 provide a limited degree of rotation for the tappet arrangement 100. Therefore, a self-alignment of the tappet arrangement 100 with respect to the driveshaft 111 and/or the cam is realized increasing the robustness of the assembly.
  • the fixing 103 on top of the tappet body 101 prevents the roller 102 from touching either the tappet or the sleeve with its plane end sides.
  • the fixing 103 comprises small spherical tips on the inside of the projecting parts 106 that run against the roller center. Therefore, the design of the roller 102 can be very simple and, thus, cost-effective. Further, the breaking torque between the roller 102 and the sleeve is avoided.
  • the tappet arrangement 100 and the wall 113 and/or the sleeve inside the bore 112 comprise a calculated clearance on both ends at the flat side surfaces 105 avoiding special machining on the tappet arrangement end face, on the projecting parts 106 and on the bore 112.
  • the tappet body 101, the fixing 103 and the roller 102 are prevented to slide along the longitudinal axis R due to the recess 107 provided on the top surface 115 of the tappet body 101 where the plunger sits with a clearance smaller than the clearance between the flat side surfaces 105 and the wall 113. This feature transmits the plunger constraint to the tappet arrangement 100.
  • the tappet arrangement 100 comprises the advantage of self-alignment and constraint of the roller position on the cam. According to aspects, there is no need for a sleeve in the bore 112 where the tappet arrangement 100 is guided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (8)

  1. Stößelanordnung für eine Hochdruckpumpe, aufweisend:
    - einen Stößelkörper (101),
    - eine teilweise im Stößelkörper (101) angeordnete Rolle (102),
    - eine Befestigung (103) zum Halten der Rolle (102) im Stößelkörper (101), um eine Bewegung der Rolle (102) in Richtung der Längsachse (R) der Rolle (102) zu verhindern, wobei der Stößelkörper (101) aufweist:
    - zwei in Richtung der Längsachse (R) der Rolle (102) ausgerichtete gegenüber angeordnete gekrümmte Seitenflächen (104) zum beweglichen Koppeln der Stößelanordnung mit einem Pumpengehäuse (114) der Hochdruckpumpe,
    dadurch gekennzeichnet, dass die Befestigung (103) zwei hervorstehende Teile (106) aufweist, die jeweils eine Spitze aufweisen, die sich in Kontakt mit der Mitte der Rolle (102) bei der Längsachse (R) befindet, um eine Bewegung der Rolle (102) in Richtung der Längsachse (R) der Rolle (102) zu verhindern.
  2. Stößelanordnung nach Anspruch 1, wobei der Stößelkörper (101) aufweist:
    - zwei in Richtung quer zur Längsachse (R) der Rolle (102) ausgerichtete gegenüber angeordnete flache Seitenflächen (105).
  3. Stößelanordnung nach Anspruch 1 oder 2, wobei die gekrümmten Seitenflächen (104) jeweils konvex sind.
  4. Stößelanordnung nach einem der Ansprüche 1 bis 3, wobei der Stößelkörper (101) eine Aussparung (107) auf der Seite (115) gegenüber der Rolle (102) zum Koppeln der Stößelanordnung mit einem Kolben (110) der Hochdruckpumpe aufweist.
  5. Hochdruckpumpe zur Verwendung bei einem Verbrennungsmotor, aufweisend:
    - einen Kolben (110) zur Druckbeaufschlagung von Kraftstoff in einer Pumpenkammer eines Pumpengehäuses während eines Kolbenpumphubs,
    - eine Antriebswelle (111),
    - eine Stößelanordnung (100) nach einem der Ansprüche 1 bis 4, wobei die Stößelanordnung (100) mit dem Kolben (110) und der Antriebswelle (110) gekoppelt ist, um eine Antriebskraft von der Antriebswelle (111) auf den Kolben (110) zum Durchführen des Kolbenpumphubs zu übertragen.
  6. Pumpe nach Anspruch 5, wobei das Pumpengehäuse (114) eine Bohrung (112) aufweist, die Form einer die Bohrung (112) umgebenden Wand (113) der Form der zwei gekrümmten Seitenflächen (104) entspricht und die zwei gekrümmten Seitenflächen (104) jeweils in Kontakt mit der Wand (113) der Bohrung (112) sind.
  7. Pumpe nach Anspruch 6, wobei die Wand (113) die Bohrung (112) so umgibt, dass die zwei flachen Seitenflächen (105) in einem Abstand zur Wand (113) angeordnet sind.
  8. Pumpe nach Anspruch 6 oder 7, wobei sich die Form der Wand (113) und die Form der zwei gekrümmten Seitenflächen (104) sowie die Form der zwei flachen Seitenflächen (105) entsprechen, so dass sich die Stößelanordnung (100) frei in einem vorgegebenen Winkel relativ zum Pumpengehäuse drehen kann.
EP12185586.0A 2012-09-24 2012-09-24 Stößelanordnung und Pumpe Active EP2711546B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12185586.0A EP2711546B1 (de) 2012-09-24 2012-09-24 Stößelanordnung und Pumpe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12185586.0A EP2711546B1 (de) 2012-09-24 2012-09-24 Stößelanordnung und Pumpe

Publications (2)

Publication Number Publication Date
EP2711546A1 EP2711546A1 (de) 2014-03-26
EP2711546B1 true EP2711546B1 (de) 2017-09-06

Family

ID=46980794

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12185586.0A Active EP2711546B1 (de) 2012-09-24 2012-09-24 Stößelanordnung und Pumpe

Country Status (1)

Country Link
EP (1) EP2711546B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101656089B1 (ko) * 2012-10-11 2016-09-08 콘티넨탈 오토모티브 게엠베하 롤러 태핏 조립체를 위한 다기능 롤러 클립
EP2915994A1 (de) * 2014-03-06 2015-09-09 Continental Automotive GmbH Stößelanordnung und Pumpe
DE102014220813B4 (de) 2014-10-14 2019-12-24 Continental Automotive Gmbh Stößelanordnung für eine Rollenstößelpumpe und eine solche aufweisende Rollenstößelpumpe

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1279049B1 (it) * 1995-10-27 1997-12-04 Eaton Automotive Spa Punteria meccanica ad azione diretta dotata di un rullino di contatto con la camma dell'albero a camme di un motore a combustione interna
JP2002332809A (ja) * 2001-05-07 2002-11-22 Fuji Oozx Inc 内燃機関における動弁機構
WO2006037676A1 (de) * 2004-10-06 2006-04-13 Siemens Aktiengesellschaft RADIALKOLBENPUMPE MIT ROLLENSTÖßEL
DE102005040219B4 (de) * 2005-08-25 2007-10-04 Ab Skf Bauteil mit umgebogenem Seitenelement
JP5303468B2 (ja) * 2006-12-05 2013-10-02 シャエフラー カーゲー 特に内燃機関の燃料ポンプのためのメカニカルタペット
JP4930478B2 (ja) * 2008-09-04 2012-05-16 トヨタ自動車株式会社 ローラリフタ、ローラリフタの製造方法、および液体用ポンプ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
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