WO2019001614A1

WO2019001614A1 - Bearing sensor ring, sensor bearing arrangement and process for the production thereof

Info

Publication number: WO2019001614A1
Application number: PCT/DE2018/100468
Authority: WO
Inventors: Klaus Daut; Stefan Reeker-Meyer; Sergej Mensch
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2017-06-27
Filing date: 2018-05-17
Publication date: 2019-01-03
Also published as: DE102017114167B3

Abstract

The present invention relates to a bearing sensor ring (02) for installation in a bearing (12) to take up the preload forces existing at the bearing (12). The bearing sensor ring (02) is made of plastic and comprises a plurality of spacers (03) and at least one sensor (07). On the radially outer circumference of the bearing sensor ring (02), the spacers (03) are oriented axially and spaced apart from one another. The at least one sensor (07) is arranged on the radially inner circumference of the bearing sensor ring (02). The at least one sensor (07) is completely encapsulated in the plastic and the spacers (03) are at least partially encapsulated in the plastic, such that at least one axial end of each spacer lies flat with one of the two side surfaces (09) of the bearing sensor ring (02) and these together form a contact surface (11). The invention also relates to a sensor bearing arrangement comprising the bearing sensor ring. The invention further relates to a method for producing the sensor bearing arrangement.

Description

Bearing sensor ring, sensor bearing assembly and method for their preparation

The present invention relates to a bearing sensor ring. The invention also relates to a sensor bearing assembly comprising the bearing sensor ring.

Furthermore, the invention relates to a method for producing the

Sensor bearing assembly.

Rolling bearings use sensors to determine, for example, the temperature, speed, forces or other parameters that exist in the bearing. Generally, these types of bearings are referred to as sensor bearings. The sensors are regularly arranged on a support ring or support ring, which is part of a sensor bearing. With the help of a carrier ring, a non-sensor stocked warehouse can be upgraded to a sensor bearing. Predominantly, the carrier ring is made of steel, in particular for shielding sensors arranged thereon. To accommodate the sensors, the ring recesses, which are mainly generated by milling. In the recesses, the sensors are inserted and then glued with silicone or a liquid plastic and / or

sealed. The production of the carrier ring for a sensor bearing, by providing and milling of the ring and by inserting and then sealing the sensors is costly.

DE 10 2009 021 469 A1 describes a sensor bearing unit comprising a roller bearing with a sensor housing arranged on a bearing ring with an integrated sensor device for detecting bearing operating states. The sensor housing is designed as an adapter ring.

From DE 10 2015 202 130 A1 a construction kit for bearings is known which comprises a plurality of modules. The modules are supply management modules, function modules for measuring storage condition variables and infrastructure modules.

In WO 2017/054810 A2, a sensor set for bearings, comprising a plurality of modules, is described. The modules are functional modules for measuring storage condition variables and infrastructure modules. From DE 10 2015 203 861 A1 a sensor device for a rolling bearing is known. The sensor device comprises two mutually rotatable bearing rings, a connectable to at least one of the two bearing rings sensor and connectable to the other of the two bearing rings signal generator. The components and / or sensors are arranged on a printed circuit board, which in turn is arranged on an outer ring, in particular made of metal. In the outer ring a potting compound is provided. The sensor device or the outer ring is arranged on the rolling bearing by means of adhesive film.

It is an object of the present invention, starting from the prior art, to provide an improved bearing sensor ring which permits precise positioning of one or more rolling element bearings and which can be manufactured at low cost. The bearing sensor ring should carry one or more sensors, protect them from environmental influences and absorb preload forces in the bearing. Furthermore, it is an object of the present invention to provide a

Sensor bearing assembly to provide that includes such a bearing sensor ring and other components of a rolling bearing. Furthermore, it is an object of the present invention to provide a method of manufacturing such a sensor bearing assembly.

According to the invention, the object is achieved by a bearing sensor ring according to the appended claim 1, by a sensor bearing arrangement according to claim 8 and by a method for producing a sensor bearing arrangement according to claim 10.

The bearing sensor ring according to the invention is provided for installation in a rolling bearing to accommodate the existing preload forces on the camp. The bearing sensor ring can be positioned about an axis of rotation of the bearing components. The bearing sensor ring is made of plastic and includes several spacers. The spacers are preferably rolling elements, in particular cylindrical rolling elements or needles. Furthermore, the bearing sensor ring comprises at least one sensor, the detection of

Measurement data, in particular of forces, speeds, temperatures or the like serving in the warehouse. In the bearing sensor ring, the spacers are embedded in the plastic at the radially outer periphery. The spacers are axially aligned and spaced along a circumferential line

arranged. Preferably, at least one sensor is arranged in the plastic on the radially inner periphery of the bearing sensor ring. Preferably, the bearing sensor ring is produced by an injection molding process. The sensor is completely surrounded by the plastic, which provides protection against external environmental influences. The spacers are at least partially surrounded by the plastic, so that at least one axial end of the spacers is not covered with plastic. Together with in each case one of the two side surfaces of the bearing sensor ring, the axial ends of the spacers, which are flush with the corresponding bearing sensor ring side surface, form a contact surface. The contact surface is preferably aligned radially. The contact surface preferably serves as a surface, by means of which the bearing sensor ring can be applied to a roller bearing.

So that the contact surface is planar, the spacers

preferably at the corresponding, as part of the contact surface

provided, axial end ground flat. Needles are known to have crests on their ends, which must be ground flat. The

Spacers serve the distance between the bearing sensor ring and

To hold rolling bearing rings. Furthermore, the spacers in the bearing can absorb existing preload forces. The spacers, which are preferably rolling elements, are preferably formed from a metal, in particular from stainless steel. Alternatively preferred are the

Spacers made of a ceramic material. As an alternative, the spacers are preferably made of plastic or carbon. The plastic of the bearing sensor ring is preferably a thermoplastic. In one embodiment, the bearing sensor ring further components, such as supply electronics, which are arranged with the at least one sensor on the radially inner periphery of the bearing sensor ring. Preferably, two to ten sensors or components are cast in the bearing sensor ring and arranged on the radially inner periphery of the bearing sensor ring. Particularly preferably four to eight sensors or components are cast in the bearing sensor ring and arranged on the radially inner periphery of the bearing sensor ring. It has proved to be particularly advantageous if the bearing sensor ring has six sensors.

The plurality of sensors are preferably electrically connected to one another in order to forward measuring signals. Preferably, the sensors are electrically connected in series and a sensor located at the end of the row is connected to an electrical connection cable, which can be connected to an external evaluation unit and / or serves to supply the sensors or components.

In one embodiment, the plastic of the bearing sensor ring has autocatalytic particles which are to be introduced into the plastic granules before casting. The autocatalytic particles serve to produce a shield which protects the at least one sensor against electromagnetic influences.

The bearing sensor ring preferably comprises six to fourteen spacers. Alternatively, preferably, the bearing sensor ring comprises eight to twelve spacers. It has proved particularly advantageous if the bearing sensor ring has ten spacers which are distributed uniformly over the circumference of the bearing sensor ring.

The spacers, which are in particular needles, preferably have a diameter of 2 mm. Smaller and / or larger spacer diameters may alternatively preferably be used in the bearing sensor ring. In one embodiment, boreholes are provided in the bearing sensor ring, into which connection elements for connecting the bearing sensor ring to the rolling bearing can be introduced. An advantage of the bearing sensor ring according to the invention is that it can be produced cost-effectively by injection molding and no metal ring or milled-out metal ring for receiving sensors is more necessary. Also, by means of the bearing sensor ring according to the invention the inclusion of biasing forces is possible, so that it can be installed in rolling bearings. The at least one sensor is protected by the surrounding plastic from environmental influences, such as moisture or dirt and shielded by the located in the plastic autocatalytic particles of electromagnetic influences.

The sensor bearing assembly according to the invention comprises a rolling bearing with an outer and a coaxial thereto inner bearing ring. Between the bearing rings Hauptwälzkörper are introduced, on which the bearing rings can roll. The bearing rings are rotatable relative to each other about a common axis of rotation. Furthermore, the sensor bearing arrangement comprises a bearing sensor ring, which corresponds to the previously described bearing sensor ring and its embodiments. Furthermore, the sensor bearing arrangement comprises at least two connecting means. Preferably, the connecting means are screws. The formed on the bearing sensor ring contact surface is located on one of the two

Rolling end faces directly on. In particular, the contact surface of the

Lagersensorrings on a surface of the rolling bearing on which the rolling bearing is formed almost full surface. The rolling bearing end face is preferably aligned radially as well as the contact surface of the bearing sensor ring. The rolling bearing end face preferably includes, inter alia, one end face of each of the inner and outer bearing rings, which bear directly against one another. The rolling bearing and the

The bearing sensor ring together have at least two threaded bores, in which the at least two connecting means are introduced, so that the bearing sensor ring and a part of the rolling bearing are connected to each other in a rotationally fixed manner. Preferably, the bearing sensor ring with the non-rotating bearing ring of the bearing is non-rotatable connected. The bearing sensor ring is adapted to receive the preload forces existing in the rolling bearing.

In one embodiment, the sensor bearing assembly has three or four

Connecting elements and four holes, in each of which a connecting element is introduced.

The dimensioning and number of spacers is to be calculated according to the selected rolling bearing on which the bearing sensor ring comes to rest, so that the corresponding biasing forces can be absorbed.

Preferably, the outer diameter of the bearing sensor ring is equal to the outer diameter of the rolling bearing. Particularly preferably, the outer diameter of the bearing sensor ring is slightly larger than the outer diameter of the rolling bearing.

The shape of the bearing sensor ring is preferably selected according to the shape of the rolling bearing.

In known sensor bearing arrangements, the bearing sensor ring advantageously replaces the following components: a printed circuit board with sensors located thereon or

Components, a Vergussmassering with connection cable, an outer ring and an adhesive film. This integrated design saves costs.

The inventive method for producing a sensor bearing assembly, which of the previously described sensor bearing assembly and their

Embodiments corresponds, provides several process steps.

In a first method step, a casting mold, preferably a round casting mold, as well as a roller bearing is provided. The diameter of the mold preferably corresponds to the outer diameter of the rolling bearing. The rolling bearing has an outer bearing ring and an inner bearing ring coaxial with the outer bearing ring. Furthermore, the rolling bearing between the bearing rings Hauptwälzkörpern on which the bearing rings to a common Rotation axis are unrolled. The rolling bearing may be a known standard rolling bearing, which is to be upgraded to a sensor rolling bearing.

In the subsequent process step, the spacers are inserted into the mold at a radially outer periphery, wherein the spacers are spaced to the outermost periphery. The spacers each have at least one axial end, which is flat or has been ground flat in an additional preceding method step. The spacers are positioned in the mold such that at least one planar axial end of the spacers lie flat on at least one of the base surfaces of the mold.

In a further method step, at least one sensor is inserted into the casting mold on a radially inner circumference, wherein the at least one sensor is preferably at a distance from the innermost circumference.

Another method step provides that plastic, in particular

thermoplastic material is introduced in liquefied form in the mold and thereby the spacers and the at least one sensor are encapsulated. The spacers are at least partially, the at least one sensor completely enclosed by the plastic. As a result, a bearing sensor ring, which corresponds to the described bearing sensor ring according to the invention and its embodiments, is produced. At least one axial end of the spacers together with one of the two side surface of the

Stock sensor scraps a bearing surface.

In the further process step, the bearing sensor ring is positioned with its contact surface on one of the two side surfaces of the rolling bearing.

A next process step provides that at least two holes are produced by the bearing sensor ring and by a bearing ring of the rolling bearing, which extends through both components together. Alternatively, these through-openings can already be left open during the injection process. In the last method step, the components positioned directly next to one another, the bearing sensor ring and the roller bearing, are screwed by means of connecting means.

In an alternative method step, a plurality of sensors and / or modules or components are arranged in the mold, which are electrically connected to one another.

Further advantages and details of the present invention will become apparent from the following description of an embodiment, with reference to the drawing. Show it:

1 is a sectional view of an embodiment of a bearing assembly with a bearing sensor ring according to the invention, Fig. 2 is a side view of the embodiment shown in FIG

Bearing assembly.

Fig. 1 shows a sectional view of a bearing assembly 01 with a bearing sensor ring 02. The bearing sensor ring 02 is made of plastic, in particular

thermoplastic resin, and in the illustrated example comprises ten cylindrical spacers 03 formed of rolling elements. The spacers 03 are in particular needles, which are equally spaced apart in the

Plastic of the bearing sensor ring 02 are arranged on the radially outer periphery. The cylindrical spacers 03 are each arranged at the same radial distance around a bearing rotation axis (FIG. 2: 06). The diameter of the spacers 03 is for example 2 mm, with others

Spacer diameter, types and numbers in the bearing sensor ring according to the male forces are selectable. Since the spacers 03 correspond to rolling elements, they can be made of ceramic, plastic, carbon or metal, in particular stainless steel. The bearing sensor ring 02 further includes a sensor 07, which is arranged in the plastic on the radially inner periphery of the bearing sensor ring 02. The cylindrical spacers 03 and the sensor 07 are common in the

Enclosed bearing sensor ring 02, so that the sensor 07 is completely surrounded by the plastic and the cylindrical spacers 03 at least partially from

Plastic are enclosed. Thus, the plastic serves as protection of the sensor 07 from environmental influences such as dust or moisture and to cushion light shocks. Is the plastic granules, before pouring or spraying to the

Storage sensor ring 02, added with autocatalytic particles, so they produce a shielding of the sensor 07 against electromagnetic interference.

Electromagnetic interferences can influence and change measuring signals. The sensor 07 serves to detect bearing state variables and can

For example, be a force measuring sensor, a speed sensor or a temperature sensor.

If a plurality of sensors 07 in the bearing sensor ring 02, in particular spaced from each other at the inner periphery in the plastic, so these are preferably circumferentially electrically connected to each other. For example, by electrical conductors (not shown). Thus, measurement signals can be forwarded and the power supply of the sensors 07 can be ensured.

The bearing assembly 01 further comprises a sensor connecting cable 08, by means of which the sensor 07 is connected to an external supply and evaluation device (not shown).

The cylindrical spacers 03 are only partially of the plastic of the

Lagerensorings 02 surrounded so that at least one axial end of each

Spacer 03 is not covered by the plastic. This axial end of

Spacer 03 is each planed, this can for example by

Abrading of crests of the rolling elements or produced in the spacer manufacturing. The axially aligned in the bearing sensor ring 02 spacers 03 and in particular their flat axial ends form one of the two side surfaces 09 of the bearing sensor ring 02 a planar contact surface 1 first The rolling bearing 12 comprises an outer bearing ring 13 (FIG. 2) and an inner bearing ring 14, which are arranged coaxially to each other about the common bearing rotation axis 06. To the bearing rotation axis 06, the two bearing rings 13, 14 are rotatable to each other.

Between the two bearing rings 13, 14 Hauptwälzkörper (not shown) for unrolling the bearing rings 13, 14 are arranged. Various embodiments of the rolling bearing 12 are possible. On a side surface 16 (FIG. 2) of the roller bearing 12, in particular the end face, the bearing sensor ring 02 is arranged directly with its contact surface 11. The rolling bearing 12 and the bearing sensor ring 02 are rotatably connected by screwing by means of screws (not shown). By the screws biasing forces are transmitted from the rolling bearing 12 to the bearing sensor ring 02. The bearing sensor ring 02 is designed so that it can absorb the biasing forces. In particular, the spacers 03 serve to absorb the force.

Fig. 2 shows a side view of the embodiment shown in FIG

Bearing assembly 01 with the roller bearing 12 and the bearing sensor ring 02nd

List of bearings

Bearing sensor ring

spacer

- - Bearing rotation axis

sensor

Sensor connection cable

Side surface of the bearing sensor ring 02

- contact surface

Rolling

Outer bearing ring

Inner bearing ring

- Side surface of the rolling bearing 12th

Claims

claims

1 . Bearing sensor ring (02) for installation in a bearing (12) consisting of plastic and a plurality of spacers (03) and at least one sensor (07) comprising, wherein at the radially outer periphery of the Lagerensensorrings (02), the spacers (03) axially aligned and the at least one sensor (07) is arranged on the radially inner circumference of the bearing sensor ring (02), and wherein the at least one sensor (07) is completely and the spacers (03) are at least partially encapsulated in the plastic, so that at least one of its axial ends are flush with one of the two side surfaces (09) of the bearing sensor ring (02) and together with this form a contact surface (1 1).

2. bearing sensor ring (02) according to claim 1, characterized in that two to ten sensors (07) spaced from each other in the bearing sensor ring (02) are arranged at its radially inner periphery.

3. bearing sensor ring (02) according to claim 2, characterized in that four to eight sensors (07) spaced from each other in the bearing sensor ring (02) are arranged at its radially inner periphery.

4. bearing sensor ring (02) according to claim 2 or 3, characterized in that the plurality of sensors (07) are electrically connected to each other in series, and a sensor located at the end of the row (07) with an electrical connection cable (08) is connected.

5. bearing sensor ring (02) according to one of claims 1 to 4, characterized

characterized in that the plastic of the bearing sensor ring (02)

autocatalytic particles for generating a shield for the at least one sensor (07).

6. bearing sensor ring (02) according to one of claims 1 to 5, characterized

characterized in that it comprises additional modules which are cast in the plastic of the bearing sensor ring (02).

7. bearing sensor ring (02) according to one of claims 1 to 6, characterized

characterized in that it comprises six to fourteen spacers (03), in particular eight to twelve spacers (03).

8. Sensor bearing arrangement (01) comprising a rolling bearing (12) with an outer bearing ring (13) and a coaxial with the outer bearing ring (13) located inner bearing ring (14) and rolling therebetween Hauptwälzkörpern, further comprising a bearing sensor ring (02) according to one of Claims 1 to 7 and at least two connecting means, wherein the contact surface (1 1) of the Lagerensensorrings (02) on one of the two Wälzlagerstirnseiten (16) directly abuts, and the roller bearing (12) and the bearing sensor ring (02) have at least two corresponding holes, in the the

Connecting means are introduced to the bearing sensor ring (02) and the roller bearing (12) rotatably connected to each other, wherein the bearing sensor ring (02) is adapted to receive the biasing forces occurring.

9. sensor bearing assembly (01) according to claim 8, characterized in that the at least two connecting means are screws.

10. A method for manufacturing a sensor bearing assembly (01) according to claim 8 or 9, comprising the following steps:

- Providing a mold and a rolling bearing (12) with an outer bearing ring (13) and a coaxial with the outer bearing ring (13) located inner bearing ring (14) and rollable therebetween

Hauptwälzkörpern;

- Inserting spacers (03) in the mold on a radial

outer circumference, so that at least one plane axial end of the

Spacer (03) rests flat on at least one of the base surfaces of the mold;

- Inserting at least one sensor (07) in the mold on a radially inner circumference;

- Overmolding of the spacers (03) and the at least one sensor (07), which are located in the mold, with plastic, so that the spacers (03) at least partially and the at least one sensor (07) is completely surrounded by the plastic, so a

Lagerensomom (02) according to one of claims 1 to 7 is formed, and wherein at least one axial end of the spacers (03) together with one of the two side surface (09) of the Lagerensensorrings (02) forms a contact surface (1 1);

- Positioning of the bearing sensor ring (02) with its contact surface (1 1) on one of the two side surfaces (16) of the rolling bearing (12);

- Generating at least two holes, which both by the

Bearing sensor ring (02) and through a bearing ring (13; 14) extends; and

- Fixing the bearing sensor ring (02) with the rolling bearing (12) by means

Connecting means, which are introduced into the holes.