EP3181837A1 - Nockenfolgerrollenvorrichtung mit aus zwei teilen hergestelltem nockenstösselkörper - Google Patents
Nockenfolgerrollenvorrichtung mit aus zwei teilen hergestelltem nockenstösselkörper Download PDFInfo
- Publication number
- EP3181837A1 EP3181837A1 EP15307044.6A EP15307044A EP3181837A1 EP 3181837 A1 EP3181837 A1 EP 3181837A1 EP 15307044 A EP15307044 A EP 15307044A EP 3181837 A1 EP3181837 A1 EP 3181837A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tappet body
- parts
- coupling member
- pin
- deformable
- 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
- 230000008878 coupling Effects 0.000 claims abstract description 54
- 238000010168 coupling process Methods 0.000 claims abstract description 54
- 238000005859 coupling reaction Methods 0.000 claims abstract description 54
- 239000000446 fuel Substances 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims abstract description 6
- 239000007924 injection Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 3
- 229920000459 Nitrile rubber Polymers 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 239000000806 elastomer Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 229920002635 polyurethane Polymers 0.000 description 4
- 239000004814 polyurethane Substances 0.000 description 4
- 229920002994 synthetic fiber Polymers 0.000 description 4
- 238000004026 adhesive bonding Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
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
- 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
-
- 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
- F01L2810/00—Arrangements solving specific problems in relation with valve gears
- F01L2810/04—Reducing noise
Definitions
- the present invention relates to the field of cam follower roller devices used in automotive or industrial applications.
- One advantageous application of the invention is the use of the cam follower roller device in a fuel injection pump intended for an internal combustion engine, in particular of a motor vehicle.
- Such a cam follower roller device generally comprises an outer tappet body, a pin mounted on the tappet body and a roller movable in rotation relative to the pin around its axis.
- the roller collaborates with a cam synchronized with the internal combustion engine camshaft or crankshaft.
- the rotation of the camshaft, or crankshaft leads to a periodic displacement of a piston of the pump that rests against the tappet body, to allow fuel to be delivered.
- the device In operation, the device is intended to slide back and forth into a pump housing. Generally, there is an angular misalignment between the axis of the tappet body and the axis of the pump housing. Accordingly, edge stresses may occur at the ends of the roller of the device with the contact against the cam. Accordingly, in operation, the pressure contact between the roller and the cam may be increased.
- One aim of the present invention is to overcome these drawbacks.
- the cam follower roller device for a pump piston of a fuel injection pump comprises a tappet body, a pin mounted on said tapped body, and a roller mounted on said pin.
- the tappet body comprises separate first and second parts. The first part supports the pin and the second part delimits an abutment surface for the pump piston.
- the device further comprises at least one deformable coupling member interposed between said first and second parts of the tappet body to couple together said parts.
- the tappet body is in at least two parts which are coupled together via the deformable coupling member to flexibly couple said parts together.
- the contact between the first and second parts of the tappet body is achieved only via the deformable coupling member. There is no direct contact between the first and second parts of the tappet body.
- the first part of the tappet body supporting the pin may tilt relative to the second part. Accordingly, an angular tilting of the axis of the pin relative to the abutment surface of the second part of the tappet body may be obtained.
- the first part which supports the pin and the roller, is able to move angularly relative to the second part to accommodate angular misalignment between the axis of the tappet body and the axis of the pump housing.
- the coupling member is deformed.
- the edge stresses that may occur at the ends of the roller with the contact against the associated cam is reduced. Accordingly, in operation, the pressure contact between the roller and the cam may be reduced.
- an axial gap is provided between said first and second parts of the tappet body, said deformable coupling member extending at least partly inside said gap.
- Said axial gap may be delimited between a lower end face of the first part of the tappet body and an upper end face of the second part of said tappet body, said end faces facing each other.
- said deformable coupling member is made from deformable material, preferably elastically deformable material.
- Said deformable coupling member may be made from synthetic material such as plastic material or elastomer or nitrile rubber or polyurethane.
- Each of the first and second parts of the tappet body may be made from at least a rigid material such as metal.
- the first part of the tappet body comprises two facing through-holes into which is mounted the pin.
- said deformable coupling member is secured to each of the first and second parts of the tappet body.
- the first part of the tappet body may delimit at least partly a cavity inside which is located the roller.
- said deformable coupling member comprises an annular ring.
- Each of the first and second parts of the tappet body may comprise a groove into which is mounted said annular ring.
- said deformable coupling member comprises at least a layer.
- said deformable coupling member further comprises retaining means connected to the layer and cooperating with the abutment surface of the second part to axially retain said second part relative to the first part.
- the retaining means may comprise hooks in axial contact with the abutment surface.
- a cam follower roller device 10 comprises a tappet housing or body 12 extending along an axis 12a, a shaft or pin 14 extending along an axis 14a perpendicular to the axis 12a, and a roller 16, with an axis 16a coaxial with the axis 14a, mounted on the pin and movable in rotation relative to said pin.
- the roller 16 is directly mounted on the pin 14.
- a rolling bearing or a plain bearing may be radially interposed.
- the roller 16 comprises an axial cylindrical outer surface (not referenced) which forms a contact surface intended to bear against the associated cam of the internal combustion engine, and two opposite radial frontal end faces (not referenced) axially delimiting said outer surface.
- the pin 14 is mounted on the tappet body 12.
- the tappet body 12 supports the pin 14.
- the pin 14 comprises two opposite pin ends and a central portion (not referenced) extending between said pin ends.
- the central portion of the pin delimits a cylindrical outer bearing seat for the roller 16.
- the portion of the pin 14 left free by the tappet body 12 delimits the central portion.
- the pin ends extend axially on either side of the roller 16.
- the tappet body 12 is formed of first and second separate parts 18, 20. As will be described later, the device 10 further comprises one deformable coupling ring 22 interposed between the first and second parts 18, 20 of the tappet body to couple together said parts.
- Each part 18, 20 of the tappet body may be made from a rigid material, such as metal or PA.
- the first part 18 of the tappet body is made in one part.
- the first part 18 extends along the axis 12a.
- the first part 18 supports the pin 14.
- the first part 18 comprises through-holes 18a, 18b inside which are mounted the pin ends of the pin. Said through-holes 18a, 18b face one another.
- the pin ends may be fixed into said through-holes 18a, 18b for example by caulking.
- the first part 18 of the tappet body delimits an open cavity 24 inside which is located the roller 16.
- the roller 16 is mounted inside the cavity 24.
- the through-holes 18a, 18b open into the cavity 24.
- the roller 16 axially protrudes outwards with respect to an upper face 18c of the first part 18 of the tappet body.
- the first part 18 also comprises a lower face 18d which delimits axially together with the upper face 18c said first part.
- the second part 20 of the tappet body is made in one part.
- the second part 20 extends along the axis 12a.
- the second part 20 also delimits an open cavity 26 oriented axially on the side opposite to the cavity 24.
- a piston of a fuel injection pump is intended to extend into the cavity 26 and to axially bear against a rear abutment surface 28 of the tappet body.
- Said rear abutment surface 28 is oriented axially on the side opposite to the roller 16.
- the rear abutment surface 28 is planar and extends radially.
- the cavity 26 is axially delimited by the rear abutment surface 28.
- the second part 20 comprises an upper face 20a and an opposite lower face 20b which delimits axially together with said upper face said second part.
- the upper face 20a axially faces the lower face 18d of the first part of the tappet body.
- the first and second parts 18, 20 of the tappet body are axially spaced apart one from another with respect to the axis 12a.
- An axial gap 30 is provided between the first and second parts 18, 20.
- the axial gap 30 is formed between the lower face 18d of the first part and the upper face 20a of the second part.
- the deformable coupling ring 22 is axially interposed between the first and second parts 18, 20 of the tappet body.
- the coupling ring 22 is axially interposed between the lower face 18d of the first part and the upper face 20a of the second part.
- the coupling ring 22 extends inside the axial gap 30.
- the coupling ring 22 is in contact with the first part 18 on one side and in contact with the second part 20 on the other side.
- the coupling ring 22 is secured to each of the first and second parts 18, 20.
- annular groove 32, respectively 34 is formed on the lower face 18d of the first part, respectively on the upper face 20a of the second part.
- the grooves 32, 34 axially face each other.
- the coupling ring 22 is mounted into each of the grooves 32, 34.
- the coupling ring 22 may be press-fitted into said grooves.
- the ring 22 may be secured into each groove 32, 34 by any appropriate means, for example by gluing.
- the coupling ring 22 has an annular form.
- the coupling ring 22 is made from deformable flexible material, for example elastically deformable material.
- the coupling ring 22 may be made from synthetic material such as plastic material or elastomer or nitrile rubber or polyurethane.
- the first part 18 of the tappet body supporting the pin 14 is able to move angularly relative to the second part 20 to accommodate angular misalignment between the axis of the housing and the axis 12a of the tappet body.
- said roller supported by the pin 14 may tilt angularly relative to the second part 20 of the tappet housing. This has the effect of reducing the edge stresses that may occur at the ends of the roller 16. Accordingly, in operation, the pressure contact between the roller 16 and the cam may be reduced.
- the device comprises one deformable coupling layer 40 axially interposed between the first and second parts 18, 20 of the tappet body.
- the coupling layer 40 is in axial contact with the first part 18 on one side and in axial contact with the second part 20 on the other side.
- the coupling layer 40 is axially interposed between the lower face 18d of the first part and the upper face 20a of the second part.
- the axial gap (not referenced) provided between these faces 18d, 20a is filled by the coupling layer 40.
- the coupling layer 40 is secured to each of the first and second parts 18, 20.
- the coupling layer 40 is secured to the lower face 18d of the first part and to the upper face 20a of the second part by any appropriate means, for example by gluing.
- the coupling layer 40 forms a flat band.
- the coupling layer 40 is made from deformable flexible material, for example elastically deformable material.
- the coupling layer 40 may be made from synthetic material such as plastic material or elastomer or nitrile rubber or polyurethane.
- the device comprises a deformable coupling member 42 interposed between the first and second parts 18, 20 of the tappet body.
- the coupling member 42 is made in one part.
- the coupling member 42 is overmoulded on the first part 18 of the tappet body.
- the coupling member 42 is made from deformable flexible material, for example elastically deformable material.
- the coupling member 42 may be made from synthetic material such as plastic material or elastomer or nitrile rubber or polyurethane.
- the coupling member 42 comprises a layer 44 axially interposed between the lower face 18d of the first part and the upper face 20a of the second part, and an anchorage portion 46 extending from said layer and disposed into a stepped through-hole 18e made into the thickness of said first part.
- the through-hole 18e extends from the lower end face 18d of the first part and opens into the cavity 24.
- the coupling member 42 also comprises a plurality of studs 48 extending from the layer 44 axially on the side opposite to the anchorage portion 46. Each stud 48 is disposed into a through-hole 20c made into the thickness of the second part 20 of the tappet body. Each through-hole 20c extends from the upper end face 20a of the second part and opens into the cavity 26.
- the coupling member 42 further comprises lugs 50 extending from each stud and into the associated through-hole 20c. Each lug 50 is provided with a radial hook 52 in axial contact against the abutment surface 28 of the second part 20. The hooks form axial retaining means to axially retain the second part 20 of the tappet body relative to the first part 18. The second part 20 may be secured to the first part 18 equipped with the coupling member 42 by axial pushing.
- each deformable coupling member of the device is made from an elastically deformable material.
- each deformable coupling member may be made from a plastically deformable material.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15307044.6A EP3181837B1 (de) | 2015-12-17 | 2015-12-17 | Nockenfolgerrollenvorrichtung mit aus zwei teilen hergestelltem nockenstösselkörper |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15307044.6A EP3181837B1 (de) | 2015-12-17 | 2015-12-17 | Nockenfolgerrollenvorrichtung mit aus zwei teilen hergestelltem nockenstösselkörper |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3181837A1 true EP3181837A1 (de) | 2017-06-21 |
EP3181837B1 EP3181837B1 (de) | 2018-08-29 |
Family
ID=55024969
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15307044.6A Active EP3181837B1 (de) | 2015-12-17 | 2015-12-17 | Nockenfolgerrollenvorrichtung mit aus zwei teilen hergestelltem nockenstösselkörper |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP3181837B1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10024201B2 (en) * | 2015-11-24 | 2018-07-17 | Aktiebolaget Skf | Cam follower roller device with spacer |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR911367A (fr) * | 1945-06-09 | 1946-07-05 | Renault | Perfectionnements à la commande des soupapes des moteurs à combustion interne |
US2548342A (en) * | 1947-02-22 | 1951-04-10 | Cav Ltd | Fuel injection pump for internalcombustion engines |
DE4203384A1 (de) * | 1992-02-06 | 1993-08-19 | Hunger Walter | Kolben einer kolbenmaschine |
US5327860A (en) * | 1992-10-14 | 1994-07-12 | Volkswagen Ag | Hydraulic tappet-clearance compensating arrangement for a cam-controlled valve lifter |
US5553512A (en) * | 1993-09-14 | 1996-09-10 | Ntn Corporation | Roller tappet having yoke member with flat top plate |
EP0757162A1 (de) * | 1995-07-29 | 1997-02-05 | Ford-Werke Aktiengesellschaft | Tassenstössel für eine Brennkraftmaschine |
EP2607636A1 (de) * | 2011-12-23 | 2013-06-26 | Aktiebolaget SKF | Mechanisches System, Einspritzpumpe mit solch einem mechanischen System und Verfahren zur Herstellung solch eines mechanischen Systems |
DE102012211113A1 (de) * | 2012-06-28 | 2014-01-02 | Schaeffler Technologies AG & Co. KG | Stößel |
DE102012221604A1 (de) * | 2012-11-27 | 2014-05-28 | Robert Bosch Gmbh | Rollenstößel für eine Pumpe, insbesondere Kraftstoffhochdruckpumpe, und Pumpe mit Rollenstößel |
-
2015
- 2015-12-17 EP EP15307044.6A patent/EP3181837B1/de active Active
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR911367A (fr) * | 1945-06-09 | 1946-07-05 | Renault | Perfectionnements à la commande des soupapes des moteurs à combustion interne |
US2548342A (en) * | 1947-02-22 | 1951-04-10 | Cav Ltd | Fuel injection pump for internalcombustion engines |
DE4203384A1 (de) * | 1992-02-06 | 1993-08-19 | Hunger Walter | Kolben einer kolbenmaschine |
US5327860A (en) * | 1992-10-14 | 1994-07-12 | Volkswagen Ag | Hydraulic tappet-clearance compensating arrangement for a cam-controlled valve lifter |
US5553512A (en) * | 1993-09-14 | 1996-09-10 | Ntn Corporation | Roller tappet having yoke member with flat top plate |
EP0757162A1 (de) * | 1995-07-29 | 1997-02-05 | Ford-Werke Aktiengesellschaft | Tassenstössel für eine Brennkraftmaschine |
EP2607636A1 (de) * | 2011-12-23 | 2013-06-26 | Aktiebolaget SKF | Mechanisches System, Einspritzpumpe mit solch einem mechanischen System und Verfahren zur Herstellung solch eines mechanischen Systems |
DE102012211113A1 (de) * | 2012-06-28 | 2014-01-02 | Schaeffler Technologies AG & Co. KG | Stößel |
DE102012221604A1 (de) * | 2012-11-27 | 2014-05-28 | Robert Bosch Gmbh | Rollenstößel für eine Pumpe, insbesondere Kraftstoffhochdruckpumpe, und Pumpe mit Rollenstößel |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10024201B2 (en) * | 2015-11-24 | 2018-07-17 | Aktiebolaget Skf | Cam follower roller device with spacer |
Also Published As
Publication number | Publication date |
---|---|
EP3181837B1 (de) | 2018-08-29 |
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