ELEVATOR ROLLER FOR AN ELEVATOR SYSTEM, ELEVATOR SYSTEM WITH AT LEAST ONE SUCH ELEVATOR ROLLER AND METHOD FOR PRODUCING AN ELEVATOR ROLLER

Description

[0001] The invention relates to an elevator roller for an elevator installation, an elevator installation with at least one such elevator roller and a method for producing an elevator roller.

[0002] In elevator systems, movable components such as elevator cars and counterweights are usually held in place by means of suspension elements, for example in the form of carrying straps, and moved vertically through an elevator shaft. Elevator rollers are often rotatably attached to the movable and stationary components, with the suspension elements running along the outer circumferential surfaces of the elevator rollers. The suspension element can completely support the weight of the movable component. The suspension element runs over at least one elevator roller. The elevator roller can be referred to as a pulley. The elevator rollers can be arranged below the car, above the car or the counterweight, or as a deflection pulley on the elevator drive. An elevator system can have any number of elevator rollers to enable the desired suspension of the system. Such elevator suspension topologies are very familiar to those skilled in the art.

[0003] A conventional elevator pulley for a support belt of an elevator system can have a flat or circumferentially grooved, essentially profiled, for example, cylindrical or smooth running surface, which is bordered on opposite sides by a peripheral disc. The peripheral discs prevent the support belt from sliding sideways in the event of an angular misalignment between the elevator pulley and the support belt. The elevator pulley can be made of metal, for example. To achieve the lowest possible friction between the peripheral discs and the support belt, the contact surfaces on the belt side can be specially machined, for example, by fine-turning, grinding, blasting, or polishing.

[0004] Elevator rollers are known from EP2684831A1 and WO2016019135A1.

[0005] Among other things, there may be a need for elevator rollers that can be used to efficiently hold and guide suspension elements, that are low-wear and robust, and / or that can be manufactured easily and / or cost-effectively. Furthermore, there may be a need for an elevator system equipped with such elevator rollers and a method for manufacturing such elevator rollers.

[0006] Such a need may be met by the subject matter of one of the independent claims. Advantageous embodiments are defined in the dependent claims and the following description.

[0007] According to a first aspect of the invention, an elevator roller for an elevator installation is presented, wherein the elevator roller has a roller body made of a metal material and a shell made of a POM material forming a running surface of the elevator roller, wherein the shell and the roller body each have a circumferentially extending, oppositely identical wave profile on a common contact surface, wherein the shell has a V-ribbed profile on the running surface which is aligned with the wave profile of the roller body and has a rib spacing which substantially corresponds to a wave spacing of the wave profile.

[0008] According to a second aspect of the invention, an elevator installation with at least one elevator roller according to an embodiment of the first aspect of the invention is presented, wherein a belt with a V-ribbed surface made of a PU material is guided in the circumferential direction over the running surface of the elevator roller.

[0009] According to a third aspect of the invention, a method for producing an elevator roller for an elevator installation is presented, wherein a shell made of a POM material forming a running surface of the elevator roller is connected to a contact surface of a roller body made of a metal material, wherein the contact surface has a corrugated profile running in the circumferential direction and a V-ribbed profile of the shell running in the circumferential direction on the running surface has a rib spacing which substantially corresponds to a corrugation spacing of the corrugated profile.

[0010] Ideas for embodiments of the present invention may be considered, among other things and without limiting the invention, as being based on the thoughts and findings described below.

[0011] In short, it is proposed that an elevator roller be composed of at least two components. An inner roller body is provided with a casing on its outer circumference, which is intended to form the outer running surface of the elevator roller. The roller body is made of a metal material, whereas the casing is to be made of a plastic specifically selected for this purpose, in the form of a POM material, or is to comprise such a POM material.

[0012] The POM material can be a polyoxymethylene material. In particular, the POM material can comprise high-molecular-weight polyoxymethylene. In particular, the POM material can be a POM copolymer (POM-C). Such a POM material can have a particularly low coefficient of friction when in contact with, for example, PU (polyurethane). Furthermore, the coefficient of friction of the POM material can be largely constant relative to PU, regardless of surface pressure, and / or largely independent of prevailing temperature and humidity. Furthermore, little or no electrostatic charging can occur when the POM material comes into contact with PU.

[0013] The roller body can be essentially circular-cylindrical or have a circular-cylindrical peripheral surface. The metal material from which the roller body is made or constructed can be steel, for example. The steel can be hardened.

[0014] The casing can be annular. The casing can be directly connected to the roller body in the radial direction. The outer circumferential surface of the casing can form the running surface of the elevator roller. The running surface can be rotationally symmetrical to a rotational axis of the elevator roller.

[0015] The circumferential surface of the roller body forms the contact surface at which the radially inner roller body adjoins the radially outer shell.

[0016] At the contact surface, the roller body and the shell have oppositely aligned wave profiles. An oppositely aligned wave profile can have a positive side and a negative side. The positive and negative sides can fit together exactly. A circumferential direction can be tangential to the axis of rotation. A wave profile can have peaks running in the circumferential direction and valleys running in the circumferential direction between the peaks. A V-ribbed profile can have wedge-shaped ribs running in the circumferential direction and wedge-shaped spaces between the ribs. The ribs can be aligned at the peaks. A rib spacing can describe a distance between two ribs, in particular between the centers of two ribs. The rib spacing is sometimes also referred to as rib pitch. A wave spacing can describe a distance between two peaks or between two valleys, in particular between the centers of two peaks or valleys.The shaft spacing is sometimes also referred to as shaft pitch.

[0017] The approach presented here enables good lateral guidance of the belt on the elevator pulley. If an angular misalignment occurs between the belt and the elevator pulley, the POM material casing results in low friction between the belt and the POM material. Due to the low friction, the ribs of the belt can slide into the spaces between the ribs of the V-ribbed profile with a low friction force. Due to the low friction force created, it can be prevented, for example, that a support belt that may be arranged slightly diagonally across the running surface of the elevator pulley moves in an axial direction of the elevator pulley over time and ultimately slips off the elevator pulley. Instead, the support belt is guided by the V-ribbed profile that the casing forms on the running surface and is prevented from shifting in the axial direction of the elevator pulley.The low friction and the resulting suppression of skew also leads to a reduction in noise.

[0018] The profiled contact surface of the roller body also results in emergency running properties even if the casing is damaged, because the belt is also guided laterally in the shaft profile of the roller body. It can be advantageous if the V-ribbed profile formed on the running surface of the casing has a rib spacing that corresponds to the shaft spacing of the shaft profile at the contact surface between the casing and the roller body. A ribbed support belt can therefore normally engage with the V-ribbed profile of the casing and be guided by it. However, in the event that the casing is damaged or missing, the V-ribbed profile can also interact with the shaft profile on the remaining roller body and be guided by it.

[0019] The corrugated profile also enables increased durability of the casing, as there is an approximately constant material thickness between the corrugated profile and the V-ribbed profile.

[0020] The shell can be molded onto the roller body using an injection molding process. On the contact surface of the shell and the roller body, the opposite wave profile can be formed by the wave profile of the roller body. The V-ribbed profile of the running surface can be formed by an injection molding tool used in the injection molding process. The contact surface of the roller body can be a boundary surface of a mold cavity of the injection molding tool. A plasticized POM material can mold the positive wave profile of the roller body as the negative wave profile of the shell, and the positive V-ribbed profile in the injection molding tool as the negative V-ribbed profile of the shell.

[0021] The casing can have a material thickness between 1 mm and 5 mm in the area of ​​the running surface. In particular, the material thickness of the casing can be between 0.1% and 10%, preferably between 1% and 5%, of the diameter of the elevator pulley. The casing is therefore not a thin coating of the pulley body, but rather a component of substantial thickness and is therefore abrasion-resistant. The casing is a load-bearing component of the elevator pulley.

[0022] The material thickness can vary at different positions along a longitudinal direction of the shell by less than 30%, preferably by less than 20%, and more preferably by less than 10%. The material thickness can thus be substantially uniform along the axial length of the shell's running surface. Material accumulations are avoided. The uniform material thickness results in uniform thermal shrinkage of the POM material during cooling. This can simplify and increase the reliability of the production of the elevator roller, and also improve the properties of the shell, for example with regard to load-bearing capacity or wear.

[0023] The POM material can exhibit a material friction coefficient of between 0.1 and 0.6 against a PU material. Due to the low material friction coefficient, only a small portion of the resulting normal force between the belt and the running surface acts as friction. Low friction leads to low abrasion and low heating of the involved components. Furthermore, the profiled belt can be prevented from running into the complementarily profiled running surface of the elevator pulley, for example, in the case of a slightly angled belt, thus reducing the tendency of the angled belt to slide off the elevator pulley in the axial direction.

[0024] In the roller body, the peak radii of the peaks can be smaller than the valley radii of the valleys. In other words, the wave profile at the contact surface between the roller body and the casing can be more curved in the peak area than in the valley area. Large valley radii can reduce stress-increasing notch effects. Particularly in hardened roller body materials, larger valley radii can prevent crack formation.

[0025] An extrusion surface of the POM material can be unprocessed, at least in the area of ​​the running surface. The extrusion surface can be understood to be an exposed surface of the POM material, as it is typically formed by an extrusion process, in particular an injection molding process used to form the casing. An extrusion surface can be particularly smooth because, on the one hand, the mold cavity of the injection molding tool can be polished and, on the other hand, a smooth surface is created on the tool by the solidification process of the plastic melt. The extrusion surface can be pore-free. The elevator roller can be used as it is removed from the injection molding tool. The extrusion surface can have a low coefficient of friction.

[0026] The casing can have at least one edge washer made of POM material, which is laterally adjacent to the running surface. The edge washer can be manufactured using an injection molding process. In particular, the edge washer can be manufactured together with the rest of the casing in a single injection molding process. The running surface and the edge washer can thus be made from a single piece. The edge washer can be used as a safety element to reliably prevent the belt from slipping sideways.

[0027] At least one edge disc of the casing can be molded onto the roller body with an outward tilt. This tilt can be compensated for by thermal shrinkage of the casing during a cooling phase after removal from the injection mold. An extrusion surface of the POM material, at least in the area of ​​the inner side of the edge disc facing the running surface, can be left unmachined. The mutual compensation of the tilt and the shrinkage eliminates the need for post-processing.

[0028] An outer ring of a bearing of the elevator pulley can form the roller body. The outer ring can have the wave profile. A bearing can have an inner ring and an outer ring. Rolling elements of a rolling bearing can be arranged between the inner ring and the outer ring. The rolling elements can be balls, barrels, rollers, or needles, for example. By using the outer ring as the roller body, a large-sized bearing can be used. The outer ring can have a greater wall thickness than that of a standard bearing. The outer ring can be machined, for example, by turning. This results in a two-part construction of the elevator pulley, with the first part being formed by the rolling bearing and the second part by the shell.

[0029] Alternatively, the roller body can have a fitting surface for an outer ring of a bearing of the elevator pulley on a side opposite the contact surface. The bearing can be pressed into the roller body. The roller body can be essentially hollow cylindrical. The bearing can be secured against lateral movement. With a large elevator running pulley, there may be enough space between the running surface and the bearing to use an easily manufactured roller body. This results in a three-part construction of the elevator pulley, with the first part being formed by the rolling bearing, the second part by the outer ring, also known as the sleeve, and the third part by the casing.

[0030] The bearing can be a sealed, double-row cage ball bearing in an O-arrangement. A sealed bearing can have two seals. The seals can close a gap between the outer ring and the inner ring on both sides. A sealed bearing can be insensitive to dirt. The sealed bearing can be filled with a lubricant. The lubricant can be enclosed in the gap by the seals. A double-row rolling bearing can have two rows of rolling elements rolling one behind the other. The double-row rolling bearing can support an axial force in addition to a radial force. A cage rolling bearing has a cage for the rolling elements. The cage is arranged in the gap between the inner ring and the outer ring. The cage has regularly arranged recesses for the rolling elements. A ball bearing has balls as rolling elements.An O-arrangement allows a double-row rolling bearing to support an axial force and thus an increased torque. The bearing can have a specific bearing clearance. This bearing clearance can occur when the bearing is unstressed. When the bearing is installed, the bearing clearance decreases. When the sleeve is applied to the contact surface, the bearing clearance decreases. A supported radial force reduces the bearing clearance on one side while increasing it on the opposite side. The bearing clearance can be adjusted to the expected radial force.

[0031] It should be noted that some of the possible features and advantages of the invention are described herein with reference to different embodiments. A person skilled in the art will recognize that the features of the elevator roller, the elevator system, and the method for manufacturing the elevator roller can be combined, adapted, or exchanged as appropriate to achieve further embodiments of the invention.

[0032] Embodiments of the invention will now be described with reference to the accompanying drawings, wherein neither the drawings nor the description are to be construed as limiting the invention. Fig. 1 shows a representation of an elevator system with at least one elevator roller according to an embodiment; Fig. 2a shows a sectional view of an elevator roller according to an embodiment; Fig. 2b shows a detailed representation of a V-ribbed profile of an elevator roller aligned with a shaft profile according to an embodiment; Fig. 3 shows a sectional view of a multi-part elevator roller according to an embodiment.

[0033] The figures are merely schematic and not to scale. The same reference numerals throughout the figures denote identical or equivalent features.

[0034] Fig. 1 shows an illustration of an elevator system 100 with at least two elevator rollers 102 according to an exemplary embodiment. The elevator rollers 102 can be referred to as pulleys of the elevator system 100. The elevator system 100 has a car 104, which is suspended vertically movably in an elevator shaft 106 by one or more belts 108. Guide rails for guiding the car 104 in the elevator shaft 106 are not shown here for the sake of simplicity.

[0035] The elevator pulleys 102 are arranged in the area of ​​a floor of the car 104, and the belt 108 runs over the elevator pulleys 102. The belt 108 connects the car 104 to a drive 110 of the elevator system 100 and a counterweight 112 of the elevator system 100. The belt 108 is attached at both ends to a fixed point 114 of the elevator shaft 106. The fixed points 114 are arranged in an upper end region of the elevator shaft 106.

[0036] The belt 108 runs from one fixed point 114 on one side of the car 104 vertically downward to one of the elevator pulleys 102. The elevator pulley 102 is arranged in a lower lateral corner area of ​​the car 104. At the elevator pulley 102, the belt 108 is deflected horizontally and runs horizontally under the car 104 to the other elevator pulley 102. The other elevator pulley 102 is arranged in an opposite lower lateral corner area of ​​the car 104. At the other elevator pulley 102, the belt 108 is deflected vertically again and runs vertically upward on the other side of the car 104 to a drive pulley of the drive 110. At the drive pulley, the belt 108 is deflected 180° and runs vertically downward to a deflection pulley 116 connected to the counterweight 112.At the deflection pulley 116, the belt 108 is again deflected by 180° and runs vertically upwards to the other fixed point 114.

[0037] The belt 108 here is a V-ribbed belt with at least one V-ribbed surface. Therefore, at least the elevator rollers 102 have a V-ribbed profile on one running surface. The V-ribbed surface engaging the V-ribbed profile guides the belt 108 laterally in the elevator rollers 102, i.e., in an axial direction of the elevator rollers 102 and thus transversely to a longitudinal direction of the V-ribbed profile. The elevator rollers 102 have edge pulleys as additional lateral guidance.

[0038] The Figuren 2a und 2b show a sectional view of an elevator roller 102 according to an embodiment. Fig. 2a shows the cross-sectional view of the entire elevator pulley. Fig. 2b shows an enlarged view of detail A of the sectional view in Fig. 2a . The elevator roller 102 essentially corresponds to one of the elevator rollers in Fig. 1 The elevator roller 102 is shown cut centrally along a rotation axis.

[0039] The elevator roller 102 has a roller body 200 and a casing 202. The casing 202 forms a running surface 204 of the elevator roller 102. The roller body 200 is made of a metal material, in particular steel. The casing 202 is made of a POM material. A POM material is referred to as a polyoxymethylene material. A contact surface 206 between the casing 202 and the roller body 200 is partially wave-shaped in a circumferential direction of the elevator roller 102. The roller body 200 thus has a positive wave profile 208, while the casing 202 has a negative wave profile 210 that is opposite to this.

[0040] In one embodiment, the POM material is referred to as PAS-L material, in particular PAS-L69. Such a POM material is offered by Faigle (based in Hard, Austria). Information on this POM material is available, among other places, at www.faigle.com, in particular at www.faigle.com / presse / die-pas-l-materialfamilie / . The density of such POM material can be approximately 1.41 g / cm³.

[0041] The maximum permissible compressive load (continuous) can be 16 N / mm² (static). The pv value, i.e., the product of the specific load (p) and the sliding speed (v), determines the suitability of the material. Both influencing factors interact with each other. Depending on the sliding speed, the value for dry running against steel can be between 0.1 and 0.15. A dynamic friction coefficient, for example, is 0.3, although this value is an average for dry running on steel.

[0042] The POM material is injection-molded onto the roller body 200 to produce the elevator roller 102. For this purpose, the roller body 200 is arranged in a receptacle of an injection mold for producing the shell 202. Closing the injection mold creates a mold cavity for the shell 202. The POM material is injected in plasticized form into the mold cavity, replicates it, and bonds with the contact surface 206. The plasticized POM material can be injected into the mold cavity via at least three evenly distributed sprues. Alternatively, the POM material can be injected into the mold cavity via an annular umbrella sprue. After the mold cavity is completely filled, the POM material cools below a plasticizing temperature and solidifies in the mold cavity. After solidification, the injection mold is opened, and the elevator roller 102 is removed.The POM material continues to cool after removal and thus achieves its desired properties.

[0043] The positive wave profile 208 of the roller body 200 has peaks 212 and valleys 214. The peaks 212 of the positive wave profile 208 have a smaller peak radius than the valley radius of the valleys 214 of the positive wave profile 208. Peak radii and valley radii merge directly into one another. Accordingly, the oppositely identical negative wave profile 210 of the shell 202 also has peaks 215 and valleys 213, with the peaks 215 of the negative wave profile 210 each having a peak radius corresponding to the valley radius of the positive wave profile 208, and the valleys 213 of the negative wave profile 210 each having a valley radius corresponding to the peak radius of the positive wave profile 208. The peaks 215 of the negative wave profile 210 therefore have a larger peak radius than the valley radius of the valleys 213 of the negative wave profile 210.

[0044] The positive wave profile 208 of the roller body 200 here has six valleys 214 and five peaks 212. The outer valleys 214 each terminate in an unprofiled shoulder area 216 of the roller body 200.

[0045] The casing 202 has a V-ribbed profile 218 on the running surface 204. The V-ribbed profile 218 has five ribs 220. The ribs 220 are radially aligned with the peaks 212 of the positive wave profile 108 of the roller body 200. A rib spacing 222 between two ribs 220 of the V-ribbed profile 218 is, within a processing tolerance, equal to a wave spacing 224 between two peaks 212 of the wave profile 208. The V-ribbed profile 218 provides lateral guidance for the belt, which is designed with V-ribbed sections.

[0046] In one embodiment, the shaft spacing 224 and the rib spacing 222 are five millimeters. However, the rib spacing can also be larger or smaller. For example, the rib spacing can range from 1 mm to 20 mm.

[0047] Due to the alignment of the splined shaft profile 218 with the positive shaft profile 108, the casing 202 has a substantially constant material thickness in the section plane shown.

[0048] In one embodiment, the elevator pulley 102 has edge discs 226. The edge discs 226 laterally limit the running surface 104 to reliably prevent the belt from running off. The edge discs 226 terminate in a narrow shoulder. The V-ribbed profile 218 adjoins the shoulder.

[0049] To eliminate the need for post-processing of the edge discs 226, the edge discs are molded with a pre-tilt during the injection molding process, i.e., with an outward pre-tilt. The thermal shrinkage of the POM material from the solidification temperature to room temperature compensates for the pre-tilt during cooling. The pre-tilt is incorporated into the injection molding tool.

[0050] In one embodiment, flanks of ribs 220 have an angle of 45°. A rib head of ribs 220 is rounded with a radius of 0.9 millimeters. At the rib head, the casing 202 has a material thickness of 3.5 millimeters. A rounded groove 228 is arranged at a rib base of ribs 220. The groove 228 is rounded with a radii of 0.5 millimeters.

[0051] In one embodiment, the peaks 212 of the positive wave profile 108 have a radius of one millimeter. The valleys 214 of the positive wave profile 108 have a radius of 1.85 millimeters.

[0052] In one embodiment (see Figur 2a ), an outer ring 230 of a bearing 232 of the elevator roller forms the roller body 200. The positive wave profile 208 is formed directly in the outer ring 230. This embodiment corresponds to a two-part design. The bearing 232 with the outer ring 230 forms the first part. The casing 202 forms the second part.

[0053] Alternatively, in one embodiment, the roller body 200 has an internal cylindrical recess into which one or more bearings 232 of the elevator roller 102 are pressed.

[0054] In one embodiment, the bearing 232 is a rolling bearing. Here, the bearing 232 is designed as a double-row ball bearing in an O-arrangement. A gap between the outer ring 230 and an inner ring 234 of the bearing 232 is sealed.

[0055] Fig. 3 shows a sectional view of a multi-part elevator roller 102 according to an embodiment. The elevator roller 102 essentially corresponds to the Fig. 2 The casing 202 and the roller body 200 are as shown in Fig. 2 firmly connected to each other. In contrast to the representation in Fig. 2 Here, the elevator roller 102 has a larger diameter. As a result, the roller body 200 has a sufficient wall thickness to press-fit a conventional bearing 232. For this purpose, the roller body 200 has an internal, substantially cylindrical recess into which one or more bearings 232 of the elevator roller 102 are pressed.

[0056] The outer ring 230 of the bearing 323 is directly connected to the roller body 200 via a press fit. This embodiment of the elevator roller 102 corresponds to a three-part design. The bearing 323, including the outer ring 230, forms the first part. In contrast to the two-part design, the three-part design further comprises a separate roller body 200 that is not formed on the outer ring 230 of the bearing 232. In this embodiment, the roller body 230 is designed as a type of sleeve. The casing 202 forms the third part. In one embodiment, the outer ring 230 of the bearing 232 is additionally fixed in the axial direction by a collar 300 extending circumferentially around the recess and a snap ring 304 inserted into a groove 302 extending circumferentially around the recess.

[0057] In one embodiment, the tread 204 has a smaller width x than in Fig. 2 . The V-ribbed profile 218 has the same rib spacing as in Fig. 2 . Therefore, the elevator roller in this embodiment has only three ribs. However, the roller body 200 has the same width as in Fig. 2 . Therefore, the edge discs 226 are wider than in Fig. 2 designed to compensate for the width difference between the running surface 204 and the roller body 200. However, the positive wave profile 208 of the roller body 200 has, as in Fig. 2 five peaks and essentially the same wave spacing. The two outermost valleys of the positive wave profile 208 therefore lie outside the running surface 204. By adjusting the injection molding tool, the width x can be varied within a variance 306.

[0058] Finally, possible designs of the elevator roller proposed here are explained again using slightly different wording.

[0059] A pulley with a plastic coating is presented. High molecular weight polyoxymethylene (POM) is used for the coating. In combination with a polyurethane (PU) belt, this results in a material friction coefficient between 0.1 and 0.6. The material friction coefficient compared to PU is essentially independent of surface pressure, temperature, and humidity. The surface pressure of the belt against PU is between 0.8 N / mm 2 and 5.0 N / mm 2 , and the coating can be used without problems at temperatures between 5 and 40°C and even at temperatures between -5 and 60°C. The air humidity can be up to 95% RH. There is little to no electrostatic charging against PU. The POM material exhibits high toughness down to -40°C and outstanding wear resistance. Furthermore, the POM material exhibits good sliding properties, high impact resistance, and strength over a wide temperature range.Its toughness results in resistance to repeated impact loads. The POM material exhibits very good temperature resistance and exceptional dimensional stability. Furthermore, the POM material exhibits permanent creep resistance and high flexural fatigue strength. Furthermore, the POM material exhibits excellent resistance to moisture, chemicals, and fuels. The POM material can be processed by injection molding and extrusion and is suitable for two-component injection molding.

[0060] Two or more pulleys with different diameters (between D85mm and D147mm), for example D95, D105, D110, D125, can be manufactured. For the larger pulleys, a three-part construction consisting of a steel ring with a plastic running surface and a bearing is used to achieve the diameter. This means that the same rolling bearing can be used for the larger pulleys. The same rolling bearing can be used for different belt widths; only the plastic outer geometry is varied. This has the advantage that the variance in the rolling bearings is eliminated or at least very small, meaning that the same rolling bearing can be used for a variety of pulley diameters. This keeps the number of rolling bearing types small, significantly reducing the effort required for conversion during production, as well as the space required and storage costs. Pressures of up to 600 bar can occur during injection molding.Due to the high pressure and high temperature, the roller body is subjected to stress during the production process (for example, the bearing clearance is reduced). Before overmolding, the ball bearing may have increased bearing clearance, adjusted to the compression during overmolding. After overmolding, the ball bearing may have optimized bearing clearance.

[0061] The roller body has rounded V-grooves, which results in an improved notch effect in the notch root.

[0062] In the manufacturing process presented here, the shrinkage behavior of the POM is taken into account during the mold design. For example, the side flanges are inclined further outward to compensate for the changes that occur during shrinkage. This has the advantage that no mechanical post-processing is required, which simplifies production and preserves the advantageous extrusion surface of the coating.

[0063] The V-ribbed profile aligned with the shaft profile results in a substantially uniform material thickness of the plastic running surface. The shaft profile creates a profiled connection between the roller body or bearing and the plastic running surface.

[0064] During production, at least three injection points or, alternatively, a shield gate are used to ensure consistent concentricity. For small diameters, the bearing can be overmolded fully assembled. For larger diameters, the bearing can be pressed into the roller body as a sleeve. The roller body can be coated before injection molding for better plastic bonding.

[0065] Finally, it should be noted that terms such as "comprising," "having," etc., do not exclude other elements or steps, and terms such as "a" or "an" do not exclude a plurality. Reference signs in the claims are not to be considered limiting.

Claims

1. Elevator roller (102) for an elevator system (100), the elevator roller (102) comprising a roller body (200) made of a metal material and a shell (202) which forms a running surface (204) of the elevator roller (102), the shell (202) and the roller body (200) each having a diametrically opposed corrugated profile (208, 210) extending in the circumferential direction on a common contact surface (206), the shell (202) having, on the running surface (204), a V-ribbed profile (218) aligned with the corrugated profile (208) of the roller body (200), which V-ribbed profile has a rib spacing (222) which substantially corresponds to a corrugation spacing (224) of the corrugated profile (208), characterized in that the shell (202) is made of a POM material.

2. Elevator roller (102) according to claim 1, wherein the shell (202) has a material thickness between 1 mm and 5 mm in the region of the running surface (204).

3. Elevator roller (102) according to claim 2, wherein the material thickness varies by less than 30% at different positions along a longitudinal direction of the shell (202).

4. Elevator roller (102) according to any of the preceding claims, wherein the POM material has a material friction coefficient of between 0.1 and 0.6 with respect to a PU material.

5. Elevator roller (102) according to any of the preceding claims, wherein the corrugated profile (208) of the roller body (200) has peaks (212) extending in the circumferential direction and valleys (214) extending in the circumferential direction between the peaks (212), wherein peak radii of the peaks (212) are smaller than valley radii of the valleys (214).

6. Elevator roller (102) according to any of the preceding claims, wherein an extrusion surface of the POM material is unmachined, at least in the region of the running surface (204).

7. Elevator roller (102) according to any of the preceding claims, wherein the shell (202) has at least one edge disc (226) which is made of the POM material and laterally adjoins the running surface (204).

8. Elevator roller (102) according to claim 7, wherein an extrusion surface of the POM material is unmachined, at least in the region of an inner side of the edge disc (226) facing the running surface (204).

9. Elevator roller (102) according to any of the preceding claims, wherein an outer ring (230) of a bearing (232) of the elevator roller (102) forms the roller body (200), wherein the outer ring (230) has the corrugated profile (208).

10. Elevator roller (102) according to any of claims 1 to 8, wherein the roller body (200) has a fitting surface for an outer ring (230) of a bearing (232) of the elevator roller (102), on a side opposite the contact surface (206).

11. Elevator roller (102) according to any of claims 8 to 9, wherein the bearing (232) is a sealed, double-row caged ball bearing in an O arrangement.

12. Elevator system (100) comprising at least one elevator roller (102) according to any of claims 1 to 11, wherein a belt (108) which has a V-ribbed surface made of a PU material is guided in the circumferential direction over the running surface (204) of the elevator roller (102).

13. Method for manufacturing an elevator roller (102) for an elevator system (100), wherein a shell (202) which is made of a POM material and forms a running surface (204) of the elevator roller (102) is connected to a contact surface (206) of a roller body (200) made of a metal material, wherein the contact surface (206) has a corrugated profile (208) extending in the circumferential direction, and a V-ribbed profile (218) of the shell (202) extending on the running surface in the circumferential direction (204) has a rib spacing (222) which substantially corresponds to a corrugation spacing (224) of the corrugated profile (208).

14. Method according to claim 13, wherein the shell (202) is injection molded onto the roller body (200) using an injection molding process, wherein on a contact surface (206) of the shell to the roller body (200), a diametrically opposed corrugated profile (210) is formed by the corrugated profile (208) of the roller body (200), and the V-ribbed profile (218) of the running surface (204) is formed by an injection molding tool used in the injection molding process.

15. Method according to claim 14, wherein at least one edge disc (226) of the shell (202) is injection molded onto the roller body (200) with an outward inclination, wherein the inclination is compensated for during a cooling phase, after removal from the injection molding tool, by thermal shrinkage of the shell (202).