DE102018112419A1 - sliding camshaft - Google Patents

sliding camshaft Download PDF

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Publication number
DE102018112419A1
DE102018112419A1 DE102018112419.8A DE102018112419A DE102018112419A1 DE 102018112419 A1 DE102018112419 A1 DE 102018112419A1 DE 102018112419 A DE102018112419 A DE 102018112419A DE 102018112419 A1 DE102018112419 A1 DE 102018112419A1
Authority
DE
Germany
Prior art keywords
ball
cam piece
camshaft
recess
transverse bore
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Withdrawn
Application number
DE102018112419.8A
Other languages
German (de)
Inventor
Matthias Ammann
Stefan Berg
Christoph Walther
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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 Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Priority to DE102018112419.8A priority Critical patent/DE102018112419A1/en
Publication of DE102018112419A1 publication Critical patent/DE102018112419A1/en
Withdrawn legal-status Critical Current

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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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0471—Assembled camshafts
    • F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L2013/0052—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

Vorgeschlagen ist eine Nockenwelle eines Schiebenockensystems, mit einer Grundwelle (1) und einem darauf zwischen zwei Positionen verschiebbar angeordneten Nockenstück (2) sowie einer Arretierung, die das Nockenstück in den Positionen fixiert und eine in einer Querbohrung (3) der Grundwelle angeordnete federbelastete Kugel (4) aufweist, die in Rastausnehmungen (6, 7) des Nockenstücks eingreift. Die Kugel soll in einer stirnseitigen Ausnehmung (9) eines längsbeweglich in der Querbohrung geführten Kolbens (8) aufgenommen sein, wobei die Ausnehmung im Mündungsbereich zylindrisch ist und an deren Grund die Form eines Kreiskegelstumpfes hat.Proposed is a camshaft of a sliding cam system, comprising a basic shaft (1) and a cam piece (2) displaceably arranged therebetween, and a catch which fixes the cam piece in the positions and a spring-loaded ball (3) arranged in a transverse bore (3). 4) which engages in latching recesses (6, 7) of the cam piece. The ball should be received in a frontal recess (9) of a longitudinally movable in the transverse bore guided piston (8), wherein the recess is cylindrical in the mouth region and at the bottom has the shape of a circular truncated cone.

Description

Die Erfindung betrifft eine Nockenwelle eines Schiebenockensystems mit einer Grundwelle und einem Nockenstück, das axial auf der Grundwelle verschoben wird, um unterschiedliche Nockenhübe darzustellen. Damit dieses die gewünschte Position nicht selbstständig verändert, wird dieses mit einer sog. ARRE (Arretierung) in Position gehalten.The invention relates to a camshaft of a sliding cam system with a basic shaft and a cam piece, which is axially displaced on the fundamental shaft to represent different cam strokes. So that this does not change the desired position independently, this is held with a so-called. ARRE (lock) in position.

Die ARRE ist im wesentlichen eine federbelastete Kugel, die in der Grundwelle steckt und in eine entsprechende Vertiefung im Nockenstück gedrückt wird.The ARRE is essentially a spring-loaded ball which is inserted in the basic shaft and pressed into a corresponding recess in the cam piece.

Bekannt sind eine federbelastete Kugel in harter Welle und eine federbelastete ARRE-Kappe in weicher Welle.A spring-loaded ball in a hard shaft and a spring-loaded ARRE cap in a soft shaft are known.

Aus Kostengründen soll die Grundwelle, in der die ARRE geführt wird, weich sein. Dies führt zu dem Problem, dass die bisher verwendete Kugel zu hohe Pressungen erzeugt.For cost reasons, the fundamental wave in which the ARRE is led should be soft. This leads to the problem that the ball used to date generates too high pressures.

Die ARRE-Kappe stützt sich mit ihrer Hülse auf einer größeren Fläche in der Bohrung ab, was die Pressungen deutlich reduziert. Allerdings ist die Haltbarkeit nicht vergleichbar mit den bisher verwendeten Kugeln.The ARRE cap is supported with its sleeve on a larger area in the bore, which significantly reduces the pressure. However, the durability is not comparable to the previously used balls.

Als Lösung dieses Problems wird Folgendes vorgeschlagen: Die bisher verwendeten Kugeln werden mit den ARRE-Kappen dahingehend kombiniert, dass die Kugel in eine Hülse oder einen Kolben gesteckt wird um die Flächenpressung zu reduzieren.As a solution to this problem, the following is proposed: The previously used balls are combined with the ARRE caps so that the ball is inserted into a sleeve or a piston to reduce the surface pressure.

Weitere Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung und aus den Figuren, in denen ein Ausführungsbeispiel einer erfindungsgemäßen Nockenwelle dargestellt ist.

  • 1 einen Ausschnitt der Nockenwelle im Längsschnitt;
  • 2 den Kolben mit der darin aufgenommenen Kugel als vergrößerte Einzelheit.
Further features of the invention will become apparent from the following description and from the figures, in which an embodiment of a camshaft according to the invention is shown.
  • 1 a section of the camshaft in longitudinal section;
  • 2 the piston with the ball received therein as an enlarged detail.

1: Die Nockenwelle umfasst eine Grundwelle 1 und ein darauf verdrehsicher und zwischen zwei Positionen verschiebbar angeordnetes Nockenstück 2, das mittels einer Arretierung in den beiden Positionen relativ zur Grundwelle 1 fixiert wird. Die Arretierung weist eine in einer Querbohrung 3 der Grundwelle 1 angeordnete Kugel 4 und eine Schraubendruckfeder 5 auf, die die Kugel 4 in Richtung von Rastausnehmungen 6 und 7 im Nockenstück 2 belastet. Die Grundwelle 1 ist aus Kostengründen nicht gehärtet, also weich. Zur Vermeidung von Oberflächenverschleiß ist die Kugel 4 in einer stirnseitigen Ausnehmung 9 eines Kolbens 8 aufgenommen, der längsbeweglich in der (weichen) Querbohrung 3 geführt ist. 1 : The camshaft includes a basic shaft 1 and a non-rotatable and slidably disposed between two positions cam piece 2 , By means of a lock in the two positions relative to the fundamental shaft 1 is fixed. The lock has one in a transverse bore 3 the fundamental wave 1 arranged ball 4 and a helical compression spring 5 on that the ball 4 in the direction of recesses 6 and 7 in the cam piece 2 loaded. The fundamental wave 1 is not hardened for cost reasons, so soft. To avoid surface wear is the ball 4 in a frontal recess 9 a piston 8th taken longitudinally movable in the (soft) transverse bore 3 is guided.

2: Die Kugel 4 ist in der Ausnehmung 9 spielarm und lose aufgenommen. Die Ausnehmung 9 ist im Mündungsbereich zylindrisch und hat an deren Grund die Form eines Kreiskegelstumpfes. 2 : The ball 4 is in the recess 9 low in play and loosely recorded. The recess 9 is cylindrical in the mouth area and has at its bottom the shape of a circular truncated cone.

Der Kolben 8 hat eine der Ausnehmung 9 gegenüberliegende weitere Ausnehmung 10 zur Außenführung der Schraubendruckfeder 5.The piston 8th has one of the recess 9 opposite further recess 10 to the outer guide of the helical compression spring 5 ,

Claims (3)

Nockenwelle eines Schiebenockensystems, mit einer Grundwelle (1) und einem darauf zwischen zwei Positionen verschiebbar angeordneten Nockenstück (2) sowie einer Arretierung, die das Nockenstück (2) in den Positionen fixiert und eine in einer Querbohrung (3) der Grundwelle (1) angeordnete federbelastete Kugel (4) aufweist, die in Rastausnehmungen (6, 7) des Nockenstücks (2) eingreift, dadurch gekennzeichnet, dass die Kugel (4) in einer stirnseitigen Ausnehmung (9) eines längsbeweglich in der Querbohrung (3) geführten Kolbens (8) aufgenommen ist, wobei die Ausnehmung (9) im Mündungsbereich zylindrisch ist und an deren Grund die Form eines Kreiskegelstumpfes hat.Camshaft of a sliding cam system, comprising a basic shaft (1) and a cam piece (2) slidably mounted thereon between two positions, and a lock fixing the cam piece (2) in the positions and one in a transverse bore (3) of the fundamental shaft (1) spring-loaded ball (4) which engages in recesses (6, 7) of the cam piece (2), characterized in that the ball (4) in a frontal recess (9) of a longitudinally movable in the transverse bore (3) guided piston (8 ), wherein the recess (9) is cylindrical in the mouth region and at the bottom of which has the shape of a circular truncated cone. Nockenwelle nach Anspruch 1, dadurch gekennzeichnet, dass die die Kugel (4) belastende Feder eine vom Kolben (8) außengeführte Schraubendruckfeder (5) ist.Camshaft to Claim 1 , characterized in that the ball (4) loading spring from the piston (8) guided outside helical compression spring (5). Nockenwelle nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Grundwelle (1) frei von einer Oberflächenhärtung ist.Camshaft to Claim 1 or 2 , characterized in that the fundamental wave (1) is free from surface hardening.
DE102018112419.8A 2018-05-24 2018-05-24 sliding camshaft Withdrawn DE102018112419A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102018112419.8A DE102018112419A1 (en) 2018-05-24 2018-05-24 sliding camshaft

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018112419.8A DE102018112419A1 (en) 2018-05-24 2018-05-24 sliding camshaft

Publications (1)

Publication Number Publication Date
DE102018112419A1 true DE102018112419A1 (en) 2019-11-28

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Family Applications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12031460B2 (en) 2020-08-12 2024-07-09 Thyssenkrupp Dynamic Components Gmbh Sliding cam system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12031460B2 (en) 2020-08-12 2024-07-09 Thyssenkrupp Dynamic Components Gmbh Sliding cam system

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R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee