Bearing for a camshaft, and a camshaft

Abstract

A bearing arrangement for a camshaft and a camshaft are provided. The bearing arrangement includes a bearing point in a bearing support frame that receives a camshaft, a bearing rolling-element cage and a bearing outer sleeve. The rolling-element cage and the outer sleeve are configured such that the outer diameter of the outer sleeve is smaller than the inside diameter of the bearing point and the outer diameter of the rolling-element cage is smaller than the inner diameter of the outer sleeve. The rolling-element cage may be provided with retention features that axially secure the cage to the outer sleeve. The rolling-element cage and/or the outer sleeve may be provided with collars that axially constrain the bearing relative to the support frame. A camshaft including at least one such bearing arrangement is also provided.

Claims

The invention claimed is: 1. A bearing arrangement for a camshaft, comprising: a bearing frame that cannot be disassembled into multiple bearing frame segments such that the bearing frame is a non-split bearing frame, the bearing frame having an inner frame surface configured to receive an outer sleeve; a rolling element cage having inner and outer cage surfaces and having first and second axial cage ends, the rolling element cage having a cage edge disposed on the first axial cage end which extends radially outwardly from the outer cage surface, the rolling element cage having a radially compressible cage protrusion proximate the second axial cage end which extends radially outwardly from the outer cage surface; and the outer sleeve having inner and outer sleeve surfaces and having first and second axial sleeve ends, a sleeve edge is disposed on the first axial sleeve end and extends radially outwardly from the outer sleeve surface, the second axial sleeve end having a same diameter as the outer sleeve surface, the bearing frame, the rolling element cage and the outer sleeve are configured such that the outer sleeve surface is disposed radially within the inner frame surface, and the cage outer surface is located radially within the inner sleeve surface, and the second axial sleeve end of the outer sleeve is disposed axially adjacent to the cage edge of the rolling element cage while the radially compressible cage protrusion of the rolling element cage axially abuts the sleeve edge of the outer sleeve without abutting the bearing frame, wherein the rolling element cage is configured to have the camshaft positioned therethrough. 2. A bearing arrangement according to claim 1 , wherein the rolling element cage and the outer sleeve are configured such that the second axial cage end extends axially beyond the first axial sleeve end. 3. The bearing arrangement according to claim 1 , wherein the radially compressible cage protrusion allows movement of the rolling element cage in a first axial direction of the bearing arrangement and prevents movement of the rolling element cage in a direction opposite the first axial direction. 4. The bearing arrangement according to claim 2 , wherein the radially compressible cage protrusion allows movement of the rolling element cage in a first axial direction of the bearing arrangement and prevents movement of the rolling element cage in a direction opposite the first axial direction. 5. A combination shaft and bearing arrangement, comprising: a shaft; and a bearing arrangement configured to support the shaft, the bearing arrangement including: a bearing frame that cannot be disassembled into multiple bearing frame segments such that the bearing frame is a non-split bearing frame, the bearing frame having an inner frame surface configured to receive an outer sleeve; a rolling element cage having inner and outer cage surfaces and having first and second axial cage ends, the rolling element cage having a cage edge disposed on the first axial cage end which extends radially outwardly from the outer cage surface, the rolling element cage having a radially compressible cage protrusion proximate the second axial cage end which extends radially outwardly from the outer cage surface; and the outer sleeve having inner and outer sleeve surfaces and having first and second axial sleeve ends, a sleeve edge is disposed on the first axial sleeve end and extends radially outwardly from the outer sleeve surface, the second axial sleeve end having a same diameter as the outer sleeve surface, the bearing frame, the rolling element cage and the outer sleeve are configured such that the outer sleeve surface is disposed radially within the inner frame surface, and the cage outer surface is located radially within the inner sleeve surface, and the second axial sleeve end of the outer sleeve is disposed axially adjacent to the cage edge of the rolling element cage while the radially compressible cage protrusion of the rolling element cage axially abuts the sleeve edge of the outer sleeve without abutting the bearing frame, wherein the rolling element cage is configured to have the shaft positioned therethrough. 6. A combination according to claim 5 , wherein the rolling element cage and the outer sleeve are configured such that the second axial cage end extends axially beyond the first axial sleeve end. 7. The combination according to claim 5 , wherein the radially compressible cage protrusion allows movement of the rolling element cage in a first axial direction of the bearing arrangement and prevents movement of the rolling element cage in a direction opposite the first axial direction. 8. The combination according to claim 6 , wherein the radially compressible cage protrusion allows movement of the rolling element cage in a first axial direction of the bearing arrangement and prevents movement of the rolling element cage in a direction opposite the first axial direction.
This application is a National Phase of PCT International Application No. PCT/DE2012/001193, filed Dec. 12, 2012, the entire disclosure of which is herein expressly incorporated by reference. BACKGROUND AND SUMMARY OF THE INVENTION The invention relates to a bearing arrangement for at least one camshaft and to a camshaft. Camshafts are used to control the valves of an internal combustion engine. Typically a camshaft is provided in each case for the intake and exhaust valves, the camshaft being supported in an engine block. The support is achieved by way of bearing bridges, for example, which comprise bearing points for the shaft of the camshaft and in which rolling bearings are introduced. Depending on the design, the bearing bridges are split or in one piece. Non-split bearing bridges are generally associated with problems regarding the axial fixation of the rolling bearings. These generally comprise a rolling element cage, the rolling elements themselves, and an outer sleeve (also referred to as outer ring). In particular the outer raceways of the rolling elements are also located on the outer sleeve. It is the object of the invention to provide a bearing arrangement for a camshaft that allows the axial fixation of a rolling bearing in a non-split bearing frame. The invention achieves the object by providing at least one bearing frame, which includes at least one bearing point for accommodating a camshaft, by providing at least one rolling element cage, by providing at least one outer sleeve, and by designing and matching the bearing frame, the rolling element cage and the outer sleeve to each other in such a way that the outer sleeve has a smaller outside diameter than the inside diameter of the bearing point, and the rolling element cage has a smaller outside diameter than the inside diameter of the outer sleeve. The bearing frame is preferably not split. The rolling elements disposed in the rolling element cage can be balls or needles, for example. In one embodiment, two bearings points for accommodating a respective camshaft are provided in the bearing frame. According to one embodiment, the outer sleeve has a radially outwardly extending edge at one end. The outer sleeve, which is seated inside the rolling element cage, has a radial edge or collar in this embodiment. According to one embodiment, the rolling element cage has a clip-like structure at one end. The rolling element cage thus comprises a kind of clip or spring shackle at one end, a securing function being exercised by way of this clip or spring shackle. One embodiment includes that the rolling element cage and the outer sleeve are designed and matched to each other in such a way that the end of the rolling element cage having the clip-like structure extends axially beyond the end of the outer sleeve having the radially outwardly extending edge. One end of the rolling element cage thus projects over the outer sleeve. This affects in particular the clip-like structures, resulting in a blocking function that prevents the rolling element cage from being pulled out of the outer sleeve. One embodiment includes that the clip-like structure allows a movement of the rolling element cage in an axial direction and prevents it in the opposite direction. The structure allows in particular the rolling element cage to be introduced into the outer sleeve and prevents the reverse process of pulling out the same. One embodiment includes that the rolling element cage has a radially outwardly extending edge at one end. In this embodiment, the rolling element cage likewise has an edge or a collar. The invention further relates to a camshaft having at least one bearing arrangement according to at least one of the above embodiments. The camshaft is in particular a composite camshaft, which is to say the individual functional elements, such as the lobes, are manufactured separately and then applied to the shaft as the carrier element. Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of one or more preferred embodiments when considered in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a spatial illustration of a camshaft; FIG. 2 shows an exploded view of a bearing arrangement for a camshaft according to an embodiment of the present invention; and FIG. 3 shows a top view of the assembled bearing arrangement of FIG. 2 . DETAILED DESCRIPTION FIG. 1 shows a camshaft 10 according to the prior art. FIG. 2 shows an exploded view of a bearing arrangement for a camshaft according to an embodiment of the present invention. A cut-out, which here is round, is provided as the bearing point 1 . 1 for the camshaft in a non-split bearing frame 1 . A rolling bearing is situated in the bearing point 1 . 1 . This bearing includes a rolling element cage 2 , an outer sleeve 3 and the rolling elements, which are not shown here. The rolling element cage 2 is situated inside the outer sleeve 3 . The rolling element cage 2 has an edge 2 . 1 as a collar at one end and a clip-like structure 2 . 2 , by way of which the cage is introduced into the outer sleeve 3 , at the opposite end. The outer sleeve 3 is essentially designed as a ring, wherein an edge 3 . 1 is also provided at one end. The edge 3 . 1 of the outer sleeve 3 and the edge 2 . 1 of the rolling element cage 2 are located opposite each other. The clip-like structure 2 . 2 . of the rolling element cage 2 allows the rolling element cage 2 to be pushed through the outer sleeve 3 , while inhibiting a movement in the opposite direction, which is to say the clip-like structure 2 . 2 holds the rolling element cage 2 and the outer sleeve 3 together. In addition, an axial movement of the rolling bearing is prevented by the two edges 2 . 1 , 3 . 1 . The top view of FIG. 3 shows that the rolling element cage, the outer sleeve and the bearing frame 1 , or specifically the bearing point in the bearing frame, are designed and matched to each other in such a way that the edges 2 . 1 , 3 . 1 of the rolling element cage 2 and of the outer sleeve 3 end with the bearing frame 1 . It can also be seen how the clip-like structure 2 . 2 of the rolling element cage 2 projects over the end of the outer sleeve 3 and thereby ensures the fixation of the two elements, which is to say the rolling element cage 2 and the outer sleeve 3 . The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.

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Patent Citations (14)

    Publication numberPublication dateAssigneeTitle
    DE-102005018244-A1November 10, 2005Aktiebolaget SkfWälzlageranordnung
    DE-102006057695-A1June 12, 2008Schaeffler KgAssembly ready roller bearing with one piece bearing outer ring useful for crankshafts of internal combustion engines can be fixed in two-part housing without additional cost
    DE-102007013039-A1September 25, 2008Bayerische Motoren Werke Aktiengesellschaft, Schaeffler KgVerfahren der Anordnung eines ungeteilten Wälzlagers an einer Welle und Wälzlager dafür
    DE-102009016162-A1October 07, 2010Schaeffler Technologies Gmbh & Co. KgWälzlagerkäfiganordnung
    DE-102010020846-A1November 24, 2011Aktiebolaget SkfCamshaft bearing for rotatable storage of camshaft of internal combustion engine, comprises bearing housing, and outer rolling element raceway, which is arranged in borehole of bearing housing
    DE-102012221604-A1May 28, 2014Robert Bosch GmbhRollenstößel für eine Pumpe, insbesondere Kraftstoffhochdruckpumpe, und Pumpe mit Rollenstößel
    EP-2360382-A2August 24, 2011Schaeffler Technologies GmbH & Co. KGLagerkombination zur radialen und axialen Abstützung insbesondere für ein Los- oder Zwischenrad in einem Getriebe
    JP-2007056932-AMarch 08, 2007Nsk Ltd, 日本精工株式会社シェル型針状ころ軸受
    JP-2011169392-ASeptember 01, 2011Ntn Corp, Ntn株式会社Segment for split retainer and rolling bearing
    JP-H0413820-AJanuary 17, 1992Hiroshi ShishidoMethod for melting metal utilizing superheated vapor and metal melting furnace using this method
    US-1523531-AJanuary 20, 1925Bugatti EttoreAntifriction bearing
    US-2010129023-A1May 27, 2010The Timken CompanyPositioning means for camshaft roller bearing
    US-8568038-B2October 29, 2013Koyo Bearings Usa LlcPositioning means for camshaft roller bearing
    WO-2012014069-A1February 02, 2012Toyota Jidosha Kabushiki KaishaRoulement à rouleaux comportant un joint intégré à une cage et arbre à cames comportant un tel roulement à rouleaux

NO-Patent Citations (2)

    Title
    German Search Report dated Nov. 26, 2012 with partial English-translation thereof {Ten (10) pages}.
    International Search Report (PCT/ISA/210) dated Apr. 9, 2013 with English translation thereof {Six (6) pages}.

Cited By (2)

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    US-2016061258-A1March 03, 2016Schaeffler Technologies AG & Co. KGNeedle bearing with a cage and a retaining tab formed on the cage
    US-2016238066-A1August 18, 2016Aktiebolaget SkfRolling bearing and a mechanical system comprising such a rolling bearing