EP2850310B1 - Clip multifonctionel de maintien de galet pour poussoir à galet - Google Patents

Clip multifonctionel de maintien de galet pour poussoir à galet Download PDF

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Publication number
EP2850310B1
EP2850310B1 EP13774179.9A EP13774179A EP2850310B1 EP 2850310 B1 EP2850310 B1 EP 2850310B1 EP 13774179 A EP13774179 A EP 13774179A EP 2850310 B1 EP2850310 B1 EP 2850310B1
Authority
EP
European Patent Office
Prior art keywords
roller
tappet assembly
piston
clip
shoe
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
EP13774179.9A
Other languages
German (de)
English (en)
Other versions
EP2850310A1 (fr
Inventor
Volker Kummetz
Ramkumar VARATHARAJAN
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
Publication of EP2850310A1 publication Critical patent/EP2850310A1/fr
Application granted granted Critical
Publication of EP2850310B1 publication Critical patent/EP2850310B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • F01L1/146—Push-rods
    • 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
    • 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
    • F04B1/0408—Pistons
    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00—Valve arrangements comprising rollers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00—Valve arrangements comprising rollers
    • F01L2305/02—Mounting of rollers

Definitions

  • the present invention relates to a roller tappet assembly, more particularly relates to a multifunctional clip for the roller tappet assembly. Furthermore, the present invention relates to a fuel injection pump, in particular a high-pressure fuel pump, comprising such a roller tappet assembly.
  • Existing fuel injection pumps comprising tappet assembly have a separate housings or clips for roller and piston of a tappet.
  • One of the housings serve the purpose of retaining the plunger in position and other housing is used to keep the roller and shoe in position.
  • FIG. 1 shows cross sectional view of the roller tappet assembly according to the prior art.
  • the roller clip according to the prior art is not a multifunctional part.
  • the tappet assembly comprises additional parts such as a clip, a spring retainer and a support ring.
  • the roller clip is not limiting the roller movement in the roller axis.
  • the tappet assembly comprises more number of parts which increases the manufacturing cost.
  • roller clip is not multi-functional and also the number of components are more in the tappet assembly.
  • US 2009/0071446 A1 discloses a tappet assembly with a roller clip which comprises a piston holding portion, a spring supporting surface and a pair of extended portions of the spring supporting surface configured to act as a restricting element to prevent movement of the roller, wherein the extended portions are formed as straight portions.
  • WO 2012/080330 A1 discloses a tappet assembly, wherein a roller of the tappet assembly is guided in a roller shoe.
  • the object of the present invention is to develop a roller clip which is multi functional in nature and also the tappet assembly having less number of components which is economical as well.
  • a tappet assembly in particular for fuel injection pumps, comprising a piston, a spring enclosing the piston, a shoe configured to accommodate a roller and a roller clip.
  • the roller clip comprises a piston holding portion, a spring supporting surface, a pair of extended portions of the spring supporting surface.
  • the piston can be attached to the piston holding portion by any of the ways but not limited to the way such as press fitting or circlipping or welding.
  • the pair of extended portions of the spring supporting surface is configured to act as a restricting element to prevent movement of the roller.
  • the extended portions of the spring supporting surface comprise a bulged profile at its bottom end and the axis of the bulged profile is in line with axis of the roller.
  • the spring sits onto the spring supporting surface of the roller clip.
  • the tappet assembly comprises the roller clip assembled in such a way that a clearance is provided between the roller clip and the shoe.
  • the tappet assembly comprises the roller clip is made as a single unit and can be made of metallic and non-metallic material.
  • the disclosure provides for a method of assembling a tappet assembly comprising acts of placing a roller into a shoe; attaching a piston to a piston holding portion of the roller clip by predetermined way such as press fitting, circlipping and welding; placing a spring onto a spring supporting surface of the roller clip; and placing assembled roller and the shoe into extended portions of the spring supporting surface.
  • the piston contacts the shoe after assembling.
  • FIG. 2 illustrates cross sectional view of the tappet assembly 1 according to the present disclosure.
  • the tappet assembly 1 comprises a piston 2, a spring 3 enclosing the piston 2, a shoe 4 configured to accommodate a roller 5 and a roller clip 6.
  • the roller clip 6 comprises a piston holding portion 7, a spring supporting surface 8, and a pair of extended portions 9 of the spring supporting surface 8.
  • the pair of extending portions 9 is configured to act as a restricting element to prevent movement of the roller 5.
  • the extended portions 9 are extended downwards to middle or axis (B-B) of the roller 5.
  • the extended portion 9 of the spring supporting surface 9 further includes a bulged profile 10 at its bottom end. The bulged profile 10 is made by punching the extended portion 9 from exterior surface.
  • axis of the bulged profile 10 is aligned with axis (A-A) of the roller 5 in order to have a stable holding which increases total stability of the tappet assembly 1. Rotation of the roller 5 at its axis is zero which is limiting axial movement of the shoe 4 and leads to less wear of both the roller clip 6 and the shoe 4.
  • FIG. 3 illustrates a cross sectional front view of the tappet assembly according to the present disclosure. It also illustrates that the roller 5 is placed into the shoe 4 before assembling with roller clip 6 of the tappet assembly 1. The piston 2 is attached to the by the piston holding portion 7 of the roller clip 6.
  • FIG. 4 illustrates a top view of the tappet assembly 1 according to the present disclosure.
  • the shoe 4 is guided on its outer diameter and movement of the shoe 4 is limited. Further, a venting channel is created around the shoe 4 since there is no side guidance of shoe 4 is observed.
  • FIG. 5 illustrates a perspective view of the assembled tappet assembly 1 according to the present disclosure.
  • the spring 3 encloses the piston 2 and sits on the roller clip 6.
  • the spring 3 is retained by the roller clip 6 as it compresses and expands during working of the tappet assembly 1.
  • the piston 2 of the tappet assembly 1 can be attached to the piston holding portion 7 by any of the ways but not limiting to press fitting or circlipping method and by way of welding.
  • the piston holding portion 7 of the roller clip 6 is made such that the piston 2 contacts top surface of the shoe 4 of the tappet assembly 1 after complete assembling.
  • FIG. 6 illustrates an exploded view of the tappet assembly according to the present disclosure.
  • a method of assembling a tappet assembly 1 comprising acts of placing a roller 5 into a shoe 4, attaching a piston 2 to a piston holding portion 7 of the roller clip 6 by predetermined way but not limited to a way selected from a group comprising press fitting, circlipping and welding, placing a spring 3 onto a spring supporting surface 8 of the roller clip 6, and placing the assembled roller 5 and the shoe 4 into extended portions 9 of the spring supporting surface 8.
  • the extended portions 9 of the spring supporting surface 9 comprise a bulged profile 10 at its bottom end on each of the extended portions 9 and are aligned with axis (A-A) of the roller 5.
  • the piston 2 contacts top surface of the shoe 4 after assembling. After assembling the roller clip 6, the translation or movement of the roller 5 in its axial direction is limited. During downward motion of the piston 2, the spring 3 applies load onto the spring supporting surface 8 and then onto the roller clip 6 which in turn transfers force/load to the roller 5.
  • FIG. 7 illustrates a side view of the tappet assembly 1 according to the present disclosure.
  • the roller clip 6 is assembled in such a way that a clearance (B) on all the sides is provided between the roller clip 6 and the shoe 4.
  • the roller clip 6 is configured into a single unit and can be made of material selected from any of the material such as metallic and non-metallic materials.
  • the sequence of upward motion of force is as follows. Firstly, the roller 5 which is in contact with a cam lobe (not shown) of a cam of an engine contacts the shoe 4. Secondly, force from the shoe 4 is transmitted to the piston 2 and which further transmits the force through the roller clip 6 and lastly the forces from the roller clip 6 is transmitted to the spring 3. It can be summarized as follows:
  • the tappet assembly 1 could find its application in a fuel injection pump of an internal combustion engine of a vehicle.
  • the roller clip is a single piece that serves multiple functions and thus the roller clip is multifunctional in nature.
  • the roller clip fits compactly and saves room at the bottom of the piston.
  • the tappet assembly comprising the roller clip is less weight which has a positive effect on the moving masses.
  • the tappet assembly is economical as the cost of a separate housing, a clip to hold the shoe, and another clip to retain the spring is eliminated.
  • the tappet assembly comprising a shoe guided about its outer diameter has enhanced ventilation possibilities.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (9)

  1. Ensemble de poussoir (1), comprenant:
    un piston (2),
    un ressort (3) entourant le piston (2);
    un sabot (4) configuré de manière à accueillir un galet (5),
    caractérisé par un clip de maintien de galet (6), comprenant:
    une partie de maintien de piston (7);
    une surface de support de ressort (8);
    une paire de parties étendues (9) de la surface de support de ressort (8) configurées de manière à agir comme un élément de restriction pour empêcher le déplacement du galet (5),
    caractérisé en ce que les parties étendues (9) de la surface de support de ressort (8) présentent un profil bombé (10) à leur extrémité inférieure, dans lequel un axe du profil bombé (10) est en ligne avec un axe du galet (5).
  2. Ensemble de poussoir (1) selon la revendication 1, dans lequel le piston (2) est attaché à la partie de maintien de piston (7) par n'importe quelle manière sélectionnée dans le groupe comprenant un ajustement par serrage, un anneau de retenue et un soudage.
  3. Ensemble de poussoir (1) selon la revendication 1, dans lequel le ressort (3) siège sur la surface de support de ressort (8) du clip de maintien de galet (6).
  4. Ensemble de poussoir (1) selon la revendication 1, dans lequel le clip de maintien de galet (6) est assemblé de telle sorte qu'un jeu (B) soit formé entre le clip de maintien de galet (6) et le sabot (4).
  5. Procédé d'assemblage d'un ensemble de poussoir (1), le procédé comprenant les étapes suivantes:
    placer un galet (5) dans un sabot (4);
    attacher un piston (2) à une partie de maintien de piston (7) du clip de maintien de galet (6) d'une manière prédéterminée;
    prévoir une surface de support de ressort (8) pourvue de parties étendues (9), dans lequel les parties étendues (9) de la surface de support de ressort (8) présentent un profil bombé (10) à leur extrémité inférieure, dans lequel un axe du profil bombé (10) est en ligne avec un axe du galet (5);
    placer un ressort (3) sur la surface de support de ressort (8) du clip de maintien de galet (6); et
    placer le galet (5) et le sabot (4) assemblés dans les parties étendues (9) de la surface de support de ressort (8).
  6. Procédé selon la revendication 5, dans lequel le clip de maintien de galet (6) est assemblé de telle sorte qu'un jeu (B) soit formé entre le clip de maintien de galet (6) et le sabot (4).
  7. Procédé selon l'une des revendications 5 ou 6, dans lequel le piston (2) est en contact avec le sabot après l'assemblage.
  8. Procédé selon l'une des revendications 5 à 7, dans lequel le piston (2) est attaché à la partie de maintien de piston (7) par n'importe quelle manière sélectionnée dans le groupe comprenant un ajustement par serrage, un anneau de retenue et un soudage.
  9. Pompe d'injection de carburant comprenant un ensemble de poussoir (1) selon l'une des revendications 1 à 4.
EP13774179.9A 2012-10-11 2013-10-09 Clip multifonctionel de maintien de galet pour poussoir à galet Active EP2850310B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN4233CH2012 2012-10-11
PCT/EP2013/071034 WO2014056975A1 (fr) 2012-10-11 2013-10-09 Porte-galet multifonctionnel pour un ensemble poussoir à galet

Publications (2)

Publication Number Publication Date
EP2850310A1 EP2850310A1 (fr) 2015-03-25
EP2850310B1 true EP2850310B1 (fr) 2016-07-20

Family

ID=49322382

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13774179.9A Active EP2850310B1 (fr) 2012-10-11 2013-10-09 Clip multifonctionel de maintien de galet pour poussoir à galet

Country Status (4)

Country Link
EP (1) EP2850310B1 (fr)
KR (1) KR101656089B1 (fr)
CN (1) CN104641102A (fr)
WO (1) WO2014056975A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9494115B2 (en) * 2014-09-22 2016-11-15 Continental Automotive Systems, Inc. Pump control apparatus and method
DE102014220813B4 (de) * 2014-10-14 2019-12-24 Continental Automotive Gmbh Stößelanordnung für eine Rollenstößelpumpe und eine solche aufweisende Rollenstößelpumpe

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3822683A (en) * 1972-12-11 1974-07-09 Caterpillar Tractor Co Roller bearing retaining clip
DE102005053827B4 (de) * 2005-03-03 2015-05-07 Ab Skf Bauteil
JP4467469B2 (ja) * 2005-06-08 2010-05-26 ボッシュ株式会社 燃料供給用ポンプ及びタペット構造体
DE102005040219B4 (de) * 2005-08-25 2007-10-04 Ab Skf Bauteil mit umgebogenem Seitenelement
JP2007303430A (ja) 2006-05-15 2007-11-22 Bosch Corp 燃料供給用ポンプ
DE102007003125A1 (de) * 2007-01-15 2008-07-17 Robert Bosch Gmbh Hochdruckpumpe für ein Kraftstoffsystem einer Brennkraftmaschine
DE102009028394A1 (de) * 2009-08-10 2011-02-17 Robert Bosch Gmbh Hochdruckpumpe
DE102010063351A1 (de) * 2010-12-17 2012-06-21 Robert Bosch Gmbh Hochdruckpumpe
EP2711546B1 (fr) * 2012-09-24 2017-09-06 Continental Automotive GmbH Agencement de poussoir et pompe

Also Published As

Publication number Publication date
CN104641102A (zh) 2015-05-20
KR20150027239A (ko) 2015-03-11
EP2850310A1 (fr) 2015-03-25
WO2014056975A1 (fr) 2014-04-17
KR101656089B1 (ko) 2016-09-08

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