WO2017032403A1

WO2017032403A1 - Rolling element bearing

Info

Publication number: WO2017032403A1
Application number: PCT/EP2015/069363
Authority: WO
Inventors: Matthias Dürr
Original assignee: Siemens Aktiengesellschaft
Priority date: 2015-08-24
Filing date: 2015-08-24
Publication date: 2017-03-02

Abstract

Rolling element bearing with a first ring (1) and a second ring (2) and rolling elements (3) disposed between the first ring (1) and the second ring (2). The invention is characterized in that the rolling element bearing is designed as one piece and does not require assembly.

Description

description

The invention relates to a roller bearing having a first ring and a second ring and rolling rolling elements arranged between the first ring and the second ring.

Rolling bearings are bearings in which between a so-called inner ring and an outer ring, in contrast to the lubrication in plain bearings, rolling body reduce the frictional resistance. They serve as a fixation of axles and shafts, wherein, take, depending on the design radial and / or axial forces ^¬ and simultaneously the rotation of the shaft or the so mounted on an axis components (eg. As a wheel) ermögli ^¬ chen , Between the three main components inner ring, outer ring and the rolling elements occurs mainly rolling friction. Since the rolling elements in the inner and outer rings roll on hardened steel surfaces with optimized lubrication, the rolling friction of these bearings is relatively low.

The production of known rolling bearings is done in individual parts, which are then assembled to form a rolling bearing. Wish ^¬ value would be a simplified production in one piece. In the industrial sector, 3D printing technology could be used for this, which is also referred to as Additive Manufacturing, or AM for short. 3D printing offers the possibility of complex machine components in a matter of manufacturing and assembly steps to produce and thus represents a considerable simplification compared to traditional manufacturing. However, this is a special production-oriented design is notwen ^¬ dig.

A significant problem of current 3D printing techniques (Fused Deposition Modeling (FDM), Selective Laser Sintering / metal ^¬ sinter (SLM), Stereolithography (SLA)) is the limited representability approximately rectangular overhangs, since in these cases, a supporting connection to the rest the con- Construction is missing and must first be produced by means of aids (support structures, powder bed) or by chance arises. In the case of the direct copy of a conventional roller bearing, this can lead to these overhangs being made in an imprecise manner and undesired material connections to the underlying surfaces occurring. As a consequence, the repair of the bearing is made considerably more difficult and / or functional surfaces are damaged so that the usability of the bearing is severely limited.

Accordingly, the object of the present invention da ^¬ rin to provide a roller bearing, which is to produce in a simple manner. This object is achieved by a rolling bearing with the features of claim 1. Advantageous embodiments and developments, which can be used individually or in combination with each other, are the subject of the dependent claims.

According to the invention this object is achieved by a rolling bearing with a first ring and a second ring and arranged between the first ring and the second ring rolling rolling elements. The invention is characterized in that the rolling bearing is integrally formed. The

Basic construction corresponds to that of a full complement cylindrical roller bearing with an outer ring, an inner ring and rollers. To avoid right-angled overhangs, the axial guide surfaces of the rollers are laid at an oblique angle and arranged in such a way that a secure, self-steering tracking of the rollers is produced and an increased capacity for axial loads compared to pure roller bearings. The erfindungsge ^¬ Permitted Rolling thus physically resembles a Taper Rollenla ^¬ ger. It thus forms a central rail, which is arranged in the middle of the treads. The rollers are provided with a correspondingly adapted profile, ie, they have a cylindrical base body which preferably has a constriction in the middle region. The roll profile is like an hourglass. To get a defined contact, the tip of the rail is flattened. Due to the cylindrical portion of the rollers, the transfer of the main load takes place in the radial direction. Decoupled from this, the load transfer takes place in the axial direction through the conical surfaces.

In a particularly advantageous embodiment of the invention, it may be provided that the first ring has a larger diameter than the second ring. It is vorgese ^¬ hen that the second ring is arranged as an inner ring in the first ring. The rolling elements are similar as arranged in a tapered roller bearing. An inventive continuation of the concept may consist in that the rolling rolling elements have a cylindrical shape with a narrowing in the central region. The constriction, which is preferably arranged in the middle region of the cylindrical rolling elements, serves as an engagement surface for the toothing formed on the first ring on the inner surface and on the second ring on the outer surface. The teeth on the rings are thus aligned with each other.

In a further special continuation of the inventive concept it can be provided that the first ring has an internal toothing. The internal toothing engages in the constriction of the central region of the rolling rolling elements.

A continuation of this concept according to the invention can consist in that the second ring has an outer toothing. The external toothing engages in the constriction of the central region of the rolling rolling elements.

In a special embodiment of the invention, a further concept may be that the internal teeth of the first ring and the external teeth of the second ring engage in the constriction in the middle region of the rolling rolling bodies. The teeth lead to a positionally stable alignment of rolling rolling elements in the comprehensive rings.

In a further specific continuation of the inventive concept, it can be provided that the rolling bearing is designed with an additional functionality. This additional radio ^¬ ality can be ^¬ introduced for example in the form of sensors. In a special embodiment of the invention, another concept may be that the additional functionality is designed in the form of a sensor. The rolling bearing according to the invention allows easy insertion of sensors. In a further specific continuation of the inventive concept, it may be provided that the Zusatzfunktio ^¬ ality is in the form of a RFIDs. The sensors include RFIDs that allow identification by means of electro ^¬ magnetic waves.

In a special embodiment of the invention, another concept may be that the additional functionality is in the form of at least one magnet. It is also possible for a plurality of magnets to be integrated into the rolling bearing according to the invention without complicated further production steps.

In a further specific continuation of the inventive concept, it can be provided that the rolling bearing can be produced by means of 3D printing. The 3D technology allows the production in one piece without assembly. There is thus a new possibility to produce tailored, non-conductive, lightweight, corrosion-resistant single-material plastic bearings with new functionality.

In a further specific continuation of the inventive concept, it can be provided that the rolling bearing in the Z direction has slopes with an angle greater than 50 °. The Z-direction corresponds to the direction of the arrow in Fig. 2. In compliance with this condition, the rolling bearing can be built without support material, ie, the adhesions by hanging material are low.

The rolling bearing according to the invention has a first ring and a second ring, wherein the first ring is preferably formed as an outer ring and has a larger diameter than the second ring, which serves as an inner ring. Between the first ring and the second ring rolling rolling elements are arranged. The rolling rolling elements are preferably cylin ^¬ derförmig formed with a constriction preferably in the central region. The shape of the rolling rolling elements thus resembles an hourglass. The outer ring or the first ring has on the inside, so in the contacting area to the rolling

Rolling, a toothing, which is formed in the form of projections, which are aligned in the direction of the rolling rolling elements. The inner ring or the second ring also has on the outer side, that is to say in the contacting region to the rolling rolling bearings, a toothing which is designed in the form of projections which are aligned in the direction of the rolling rolling bodies. The toothing on the inside of the first ring and the teeth on the geek ^¬ te of the second ring are engaged with the constriction of the cylindrically shaped rolling bearings. The thus designed rolling bearing according to the invention allows a one-piece production ^¬ example in 3D printing.

Further advantages and embodiments of the invention will be explained below with reference to exemplary embodiments and with reference to the drawing.

1 is a plan view of the rolling bearing according to the invention in the direction of the Z-axis; Fig. 2 in a side view of the rolling bearing according to the invention with partial section contours of the first and second ring and the rolling elements mounted therebetween in the direction of the Z axis.

Fig. 1 shows an inventive rolling bearing. The fiction, modern ^¬ rolling bearing comprises a first ring 1 and a second ring 2, wherein the first ring 1 is preferably formed as an outer ring and having a larger diameter than the second ring 2 serving as an inner ring. Between the first ring 1 and the second ring 2 rolling rolling elements 3 are arranged. The shape of rolling rolling elements 3 is similar to an hourglass. From this representation, it can be seen that during construction in this position no perpendicular overhangs arise, so that no support structures are needed. Advantage ^¬ haft is also that when building in this position largely isotropic material and surface properties are achieved in the xy direction. In Fig. 2, the rolling bearing according to the invention is shown with Teilab ^¬ sectional contours of the first and second ring and the rolling elements mounted therebetween. The rolling rolling elements 3 are preferably cylindrical-shaped with egg ^¬ ner narrowing 4 is preferably in the central region. The outer ring or the first ring 1 has on the inside, ie in the contacting area to the rolling rolling bearings 3, a toothing 5, which is formed in the form of projections which are aligned in the direction of rolling rolling elements 3. The inner ring or the second ring 2 has on the outside, so in the contacting region to the rolling bearings 3, also a toothing 6, which is in the form of projections which are aligned in the direction of the rolling rolling elements 3. The toothing 5 on the inside of the first ring 1 and the toothing 6 on the outside of the second ring 2 engage in the constriction 4 of the cylindrically shaped rolling rolling bearings 3. The rolling bearing according to the invention is characterized in that the rolling bearing can be made in one piece without costly assembly ge ^¬ . This is achieved by a simple Modifika ^¬ tion with an arbitrarily shaped housing, the diameter can be made variable. In addition, the rolling rolling elements have a cylindrical basic shape with a constriction, in which engages the toothing of the rings. The rolling bearing according to the invention has an improved absorption of axial forces compared to a conventional roller bearing. Under load, the rolling rolling elements align in the direction of travel. Furthermore, additional Funktionalitä ^¬ th can be easily introduced.

Reference sign list

1 first ring

2 second ring

3 rolling elements

4 constriction

5 toothing on the first ring

6 toothing on the second ring

Claims

claims

1. rolling bearing with a first ring (1) and a second ring (2) and between the first ring (1) and the second ring (2) arranged rolling rolling elements (3), characterized in that the rolling bearing is integrally formed.

2. Rolling bearing according to claim 1, characterized in that the first ring (1) has a larger diameter than the second ring (2).

3. Rolling bearing according to claim 1 or 2, characterized in that the rolling rolling elements (3) have a cylindrical shape with a constriction (4) in the central region.

Rolling bearing according to one of claims 1 to 3, characterized in that the first ring (1) has a toothing (5).

Rolling bearing according to one of claims 1 to 4, characterized in that the second ring (2) has a toothing (6).

6. Rolling bearing according to one of claims 3 to 5, characterized in that the toothing (5) of the first ring (1) and the toothing (6) of the second ring (2) in the constriction (4) in the central region of the rolling rolling elements ( 3) attacks.

7. Rolling bearing according to one of claims 1 to 6, characterized in that the rolling bearing is formed with an additional functionality.

8. Rolling bearing according to claim 7, characterized in that the additional functionality is designed in the form of a sensor.

9. Rolling bearing according to claim 7, characterized in that the additional functionality is in the form of an RFID.

10. Rolling bearing according to claim 7, characterized in that the additional functionality is in the form of at least one magnet.

11. Rolling bearing according to one of claims 1 to 10, characterized in that the rolling bearing by means of 3D printing forth ^{¬ is} adjustable.

12. Rolling bearing according to one of claims 1 to 11, characterized in that the rolling bearing in the Z direction has slopes at an angle greater than 50 °.