EP2850310A1 - A multifunctional roller clip for a roller tappet assembly - Google Patents
A multifunctional roller clip for a roller tappet assemblyInfo
- Publication number
- EP2850310A1 EP2850310A1 EP13774179.9A EP13774179A EP2850310A1 EP 2850310 A1 EP2850310 A1 EP 2850310A1 EP 13774179 A EP13774179 A EP 13774179A EP 2850310 A1 EP2850310 A1 EP 2850310A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- piston
- tappet assembly
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 claims description 14
- 239000000446 fuel Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000010276 construction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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
- 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
- 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
- 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
- a multifunctional roller clip for a roller tappet assembly 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.
- 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. 1 shows cross sectional view of the roller tappet assembly according to the prior art.
- FIG. 2 shows cross sectional view of the roller tappet assembly according to the present disclosure.
- FIG. 3 shows cross sectional front view of the tappet assembly according to the present disclosure.
- FIG. 4 shows top view of the tappet assembly according to the present disclosure.
- FIG. 5 shows perspective view of the tappet assembly according to the present disclosure.
- FIG. 6 shows exploded view of the tappet assembly according to the present disclosure.
- FIG. 7 shows side view of the tappet assembly according to the present disclosure.
- 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.
- 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 ,
- 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 as ⁇ sembling. 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.
- the tappet assembly 1 could find its ap ⁇ plication 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.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IN4233CH2012 | 2012-10-11 | ||
PCT/EP2013/071034 WO2014056975A1 (en) | 2012-10-11 | 2013-10-09 | A multifunctional roller clip for a roller tappet assembly |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2850310A1 true EP2850310A1 (en) | 2015-03-25 |
EP2850310B1 EP2850310B1 (en) | 2016-07-20 |
Family
ID=49322382
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13774179.9A Active EP2850310B1 (en) | 2012-10-11 | 2013-10-09 | A multifunctional roller clip for a roller tappet assembly |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2850310B1 (en) |
KR (1) | KR101656089B1 (en) |
CN (1) | CN104641102A (en) |
WO (1) | WO2014056975A1 (en) |
Families Citing this family (2)
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 (en) * | 2014-10-14 | 2019-12-24 | Continental Automotive Gmbh | Tappet arrangement for a roller tappet pump and such a roller tappet pump |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3822683A (en) * | 1972-12-11 | 1974-07-09 | Caterpillar Tractor Co | Roller bearing retaining clip |
DE102005053827B4 (en) * | 2005-03-03 | 2015-05-07 | Ab Skf | component |
JP4467469B2 (en) * | 2005-06-08 | 2010-05-26 | ボッシュ株式会社 | Fuel supply pump and tappet structure |
DE102005040219B4 (en) * | 2005-08-25 | 2007-10-04 | Ab Skf | Component with bent side element |
JP2007303430A (en) | 2006-05-15 | 2007-11-22 | Bosch Corp | Pump for supplying fuel |
DE102007003125A1 (en) * | 2007-01-15 | 2008-07-17 | Robert Bosch Gmbh | High-pressure pump for use in fuel system of internal-combustion engine i.e. diesel engine, has roller arranged between tappet and cam section, where front surface of roller includes surface structure with certain unevenness or patterns |
DE102009028394A1 (en) * | 2009-08-10 | 2011-02-17 | Robert Bosch Gmbh | high pressure pump |
DE102010063351A1 (en) * | 2010-12-17 | 2012-06-21 | Robert Bosch Gmbh | high pressure pump |
EP2711546B1 (en) * | 2012-09-24 | 2017-09-06 | Continental Automotive GmbH | Tappet arrangement and pump |
-
2013
- 2013-10-09 WO PCT/EP2013/071034 patent/WO2014056975A1/en active Application Filing
- 2013-10-09 CN CN201380040317.1A patent/CN104641102A/en active Pending
- 2013-10-09 EP EP13774179.9A patent/EP2850310B1/en active Active
- 2013-10-09 KR KR1020157001733A patent/KR101656089B1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO2014056975A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN104641102A (en) | 2015-05-20 |
KR20150027239A (en) | 2015-03-11 |
WO2014056975A1 (en) | 2014-04-17 |
KR101656089B1 (en) | 2016-09-08 |
EP2850310B1 (en) | 2016-07-20 |
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