DE19526852A1 - Cam follower - Google Patents
Cam followerInfo
- Publication number
- DE19526852A1 DE19526852A1 DE19526852A DE19526852A DE19526852A1 DE 19526852 A1 DE19526852 A1 DE 19526852A1 DE 19526852 A DE19526852 A DE 19526852A DE 19526852 A DE19526852 A DE 19526852A DE 19526852 A1 DE19526852 A1 DE 19526852A1
- Authority
- DE
- Germany
- Prior art keywords
- roller
- cam
- cam follower
- rolling elements
- spherical
- 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.)
- Withdrawn
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract 2
- 238000005096 rolling process Methods 0.000 claims description 10
- 230000002028 premature Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
- F16C13/006—Guiding rollers, wheels or the like, formed by or on the outer element of a single bearing or bearing unit, e.g. two adjacent bearings, whose ratio of length to diameter is generally less than one
-
- 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
- F01L1/18—Rocking arms or levers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
- F16C23/06—Ball or roller bearings
- F16C23/08—Ball or roller bearings self-adjusting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
- F16C2360/18—Camshafts
Abstract
Description
Die Erfindung betrifft einen Nockenfolger für einen Ventiltrieb einer Brenn kraftmaschine, bestehend aus einem Gehäuse mit im wesentlichen parallel zueinander verlaufenden Wangen und darin fluchtend angeordneten Bohrun gen, in denen ein Bolzen befestigt ist, auf dem über Wälzkörper eine einem Steuernocken zugewandte Rolle drehbar gelagert ist.The invention relates to a cam follower for a valve train of a burner Engine consisting of a housing with a substantially parallel cheeks running towards each other and bore aligned therein conditions in which a bolt is fastened, on which a one over rolling elements Control cam facing roller is rotatably mounted.
Es ist in der Wälzlagertechnik ein altbekanntes Problem, daß an den Rändern der Laufbahnen und an den Rändern der Wälzkörpermantelflächen Spannungs erhöhungen auftreten können. Dadurch bedingt, treten an dieser Stelle Material ermüdungen früher als im mittleren Teil der Laufflächen auf und verringern somit die Lebensdauer des Lagers durch die an dieser Stelle vorzeitig auftreten den Schäden. Dieses als Kantentragen bekannte Verhalten von Lagern versucht man dadurch zu beseitigen, daß man eine oder mehrere Laufbahnen des Lagers ballig ausführt. Ein derartiges Lager ist in der AT 311 135 dargestellt. It is a well-known problem in rolling bearing technology that on the edges tension on the raceways and on the edges of the rolling surface surfaces increases can occur. Because of this, material appears at this point reduce and reduce fatigue earlier than in the middle part of the tread thus the life of the bearing due to premature occurrence at this point the damage. This behavior of camps, known as edge wear, is attempted to be eliminated by having one or more raceways of the camp performs crowned. Such a bearing is shown in AT 311 135.
Diese Problematik gilt prinzipiell auch für wälzgelagerte Rollen eines Nocken folgers, wie er beispielhaft in der US 50 54 440 dargestellt ist. Das Kantentragen wird dabei durch eine Abweichung der Parallelität der Drehachsen von Rolle und Nocken verursacht. Dieses Kantentragen kann nun bei Nockenfolgern dazu führen, daß nicht alle Nockenwerkstoffe die damit verbundenen hohen Bela stungen aushalten, d. h. die Stelle hoher Belastung lag zwischen Nocken und Rolle und man war daher in der Auswahl der Nockenwerkstoffe beschränkt.In principle, this problem also applies to roller-bearing rollers of a cam follower, as it is exemplified in US 50 54 440. The edge wearing is caused by a deviation in the parallelism of the axes of rotation from the roll and caused cams. This edge wear can now be added to cam followers lead that not all cam materials the associated high Bela endure, d. H. the place of high load was between cams and Role and was therefore limited in the choice of cam materials.
Aufgabe der Erfindung ist es daher, eine Möglichkeit zur Verhinderung des Kantentragens bei Nockenfolgern zu entwickeln.The object of the invention is therefore to provide a way to prevent To develop edge wearers with cam followers.
Nach dem kennzeichnenden Teil des Hauptanspruches wird diese Aufgabe dadurch gelöst, daß die Innenlaufbahn der Rolle im Längsschnitt ballig ausgebil det ist. Dadurch wird erreicht, daß die durch den bisherigen Kontakt erzeugte Stelle hoher Pressung zwischen Rolle und Nocken in den für Nockenfolger unkritischen Bereich zwischen Rolle und Wälzkörper verlagert wird. Durch die linienförmige Anlage des Nockens an der Rolle wird in Gegensatz zur vorher punktförmigen Anlage eine Verringerung der Pressung zwischen diesen erreicht, so daß eine vermehrte Anzahl von Nockenwerkstoffen in Betracht kommt.According to the characterizing part of the main claim, this task solved in that the inner raceway of the roller in the longitudinal section is spherical det. This ensures that the one generated by the previous contact Place high pressure between roller and cam in the for cam follower non-critical area between the roller and rolling element is shifted. Through the line-shaped contact of the cam on the roller is in contrast to the previous one punctiform system achieves a reduction in the pressure between them, so that an increased number of cam materials comes into consideration.
Natürlich ist es in Weiterbildung der Erfindung nach Anspruch 2 auch möglich, den Winkelfehlerausgleich nicht nur über die Innenlaufbahn der Rolle, sondern zusätzlich über die ballige Gestaltung von Außenlaufbahnen der Rolle und/oder die ballige Gestaltung der Wälzkörper vorzunehmen.Of course, in a further development of the invention according to claim 2, it is also possible the angular error compensation not only via the inner raceway of the roller, but also additionally on the spherical design of the roller's outer raceways and / or perform the spherical design of the rolling elements.
Die einzige Figur beschreibt einen teilweisen Axialschnitt durch einen Nocken folger nach der erfindungsgemäßen Lösung. The only figure describes a partial axial section through a cam follower after the solution according to the invention.
Der in der Figur dargestellte Nockenfolger besteht aus den beiden Wangen 1 und 2, die je eine Bohrung 3 und 4 aufweisen. In diese fluchtenden Bohrungen 3 und 4 ist der Bolzen 5 befestigt, auf dem über Wälzkörper 6 die Rolle 7 drehbar gelagert ist. Die Rolle 7 wird vom Nocken 8 beaufschlagt. Durch die mittels eines Doppelpfeiles dargestellte Schiefstellung der Achse 9 des Nockens 8 gegenüber der Lagerachse 10 der Rolle 7 ist die fehlende Parallelität zwischen Nocken 8 und Rolle 7 bzw. dessen Bolzen 5 sichtbar.The cam follower shown in the figure consists of the two cheeks 1 and 2 , each having a bore 3 and 4 . In these aligned bores 3 and 4 , the bolt 5 is fastened, on which the roller 7 is rotatably mounted via rolling elements 6 . The roller 7 is acted upon by the cam 8 . Due to the inclination of the axis 9 of the cam 8 relative to the bearing axis 10 of the roller 7 , shown by means of a double arrow, the lack of parallelism between the cam 8 and roller 7 or its bolt 5 is visible.
Wie der Figur weiter entnommen werden kann, weist erfindungsgemäß die Innenlaufbahn 11 der Rolle 7 einen im Längsschnitt gesehen balligen Verlauf auf, so daß trotz Schiefstellung der Achsen 9 und 10 zueinander zwischen Rolle 7 und Nocken 8 keine punktförmige, sondern eine linienförmige Anlage gege ben ist. Die punktförmige Anlage 12, die nach dem bisherigen Stand der Tech nik im Randbereich zwischen Nocken 8 und Rolle 7 vorhanden war, ist nun in den unkritischen Bereich zwischen Rolle 7 und Wälzkörper 6 verlagert, d. h. die spezifische Pressung zwischen Nocken 8 und Rolle 7 ist vermindert.As can be seen from the figure, according to the invention, the inner race 11 of the roller 7 has a crowned profile seen in longitudinal section, so that despite the inclination of the axes 9 and 10 relative to one another between the roller 7 and the cam 8, there is no punctiform but a linear contact . The punctiform system 12 , which was available in the edge area between cam 8 and roller 7 according to the prior art, is now shifted into the non-critical area between roller 7 and rolling element 6 , ie the specific pressure between cam 8 and roller 7 is reduced .
BezugszeichenlisteReference list
1 Wange
2 Wange
3 Bohrung
4 Bohrung
5 Bolzen
6 Wälzkörper
7 Rolle
8 Nocken
9 Achse
10 Achse
11 Innenlaufbahn
12 Punkt erhöhter Pressung
13 Außenlaufbahn 1 cheek
2 cheek
3 hole
4 hole
5 bolts
6 rolling elements
7 roll
8 cams
9 axis
10 axis
11 inner track
12 point increased pressure
13 outside track
Claims (2)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19526852A DE19526852A1 (en) | 1995-07-22 | 1995-07-22 | Cam follower |
DE19680575T DE19680575D2 (en) | 1995-07-22 | 1996-02-23 | Cam follower |
KR1019970709326A KR19990022857A (en) | 1995-07-22 | 1996-02-23 | Cam follower |
JP9506197A JPH11509292A (en) | 1995-07-22 | 1996-02-23 | Cam follower |
PCT/EP1996/000745 WO1997004219A1 (en) | 1995-07-22 | 1996-02-23 | Cam follower |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19526852A DE19526852A1 (en) | 1995-07-22 | 1995-07-22 | Cam follower |
Publications (1)
Publication Number | Publication Date |
---|---|
DE19526852A1 true DE19526852A1 (en) | 1997-01-23 |
Family
ID=7767557
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19526852A Withdrawn DE19526852A1 (en) | 1995-07-22 | 1995-07-22 | Cam follower |
DE19680575T Ceased DE19680575D2 (en) | 1995-07-22 | 1996-02-23 | Cam follower |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19680575T Ceased DE19680575D2 (en) | 1995-07-22 | 1996-02-23 | Cam follower |
Country Status (4)
Country | Link |
---|---|
JP (1) | JPH11509292A (en) |
KR (1) | KR19990022857A (en) |
DE (2) | DE19526852A1 (en) |
WO (1) | WO1997004219A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004061097A1 (en) * | 2004-12-18 | 2006-06-22 | Schaeffler Kg | End profiling on plain bearing counterpart partners to reduce surface pressure |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT311135B (en) * | 1970-11-16 | 1973-10-25 | Skf Ind Trading & Dev | Cylindrical roller bearing |
JPS5392025A (en) * | 1977-01-21 | 1978-08-12 | Toyota Motor Corp | Rocker arm for engine valve mechanism |
DE3622245A1 (en) * | 1986-07-02 | 1988-01-14 | Ford Werke Ag | ROLLER TOWEL ARRANGEMENT WITH TORQUE PROTECTION, ESPECIALLY FOR INTERNAL COMBUSTION ENGINES |
US4724803A (en) * | 1986-05-29 | 1988-02-16 | General Motors Corporation | Rolling contact rocker arm with reaction member, rocker key and roller follower |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH328840A (en) * | 1954-04-02 | 1958-03-31 | Alfred Pitner Et Societe Anony | Needle bearing |
JP2743488B2 (en) * | 1989-06-29 | 1998-04-22 | 日本精工株式会社 | Cam follower for engine valve train |
-
1995
- 1995-07-22 DE DE19526852A patent/DE19526852A1/en not_active Withdrawn
-
1996
- 1996-02-23 JP JP9506197A patent/JPH11509292A/en active Pending
- 1996-02-23 WO PCT/EP1996/000745 patent/WO1997004219A1/en not_active Application Discontinuation
- 1996-02-23 DE DE19680575T patent/DE19680575D2/en not_active Ceased
- 1996-02-23 KR KR1019970709326A patent/KR19990022857A/en not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT311135B (en) * | 1970-11-16 | 1973-10-25 | Skf Ind Trading & Dev | Cylindrical roller bearing |
JPS5392025A (en) * | 1977-01-21 | 1978-08-12 | Toyota Motor Corp | Rocker arm for engine valve mechanism |
US4724803A (en) * | 1986-05-29 | 1988-02-16 | General Motors Corporation | Rolling contact rocker arm with reaction member, rocker key and roller follower |
DE3622245A1 (en) * | 1986-07-02 | 1988-01-14 | Ford Werke Ag | ROLLER TOWEL ARRANGEMENT WITH TORQUE PROTECTION, ESPECIALLY FOR INTERNAL COMBUSTION ENGINES |
Non-Patent Citations (1)
Title |
---|
Taschenbuch Maschinenbau, Bd.1/II Grundlagen, VEB Verlag Technik, Berlin, 1980, 4.Aufl., S.550 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004061097A1 (en) * | 2004-12-18 | 2006-06-22 | Schaeffler Kg | End profiling on plain bearing counterpart partners to reduce surface pressure |
US7954999B2 (en) | 2004-12-18 | 2011-06-07 | Schaeffler Kg | End profile on slide bearing complementary elements for reducing surface pressure |
Also Published As
Publication number | Publication date |
---|---|
DE19680575D2 (en) | 1998-10-01 |
WO1997004219A1 (en) | 1997-02-06 |
KR19990022857A (en) | 1999-03-25 |
JPH11509292A (en) | 1999-08-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
8143 | Withdrawn due to claiming internal priority |