Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
  • F16H55/02—Toothed members; Worms
  • F16H55/30—Chain-wheels
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
  • F16H55/02—Toothed members; Worms
  • F16H55/30—Chain-wheels
  • F16H55/303—Chain-wheels for round linked chains, i.e. hoisting chains with identical links
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
  • F16H55/02—Toothed members; Worms
  • F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
  • F16H2055/065—Moulded gears, e.g. inserts therefor

Definitions

• the invention relates to a pocket sprocket for link chains, in particular round or section steel chains, the peripheral surface is provided with circumferentially alternately differently shaped, radially in the chain pockets extending wheel pockets.
• Pocket sprockets with which link chains are deflected or driven, have long been known. Most widely used are pocket sprockets for round and section steel chains. They are used in conveyors, such as chain drives or hoists.
• the shape of the pockets depends on the one hand on the shape of the chain links of the link chains.
• the pocket shape for round steel chains, whose members have a substantially circular Mate- rialquerites differs from the pocket shape for profile steel chains whose cross section is not circular but rectangular, for example.
• the shape of the pockets is also determined by the orientation in which the link chain runs onto the peripheral surface.
• two different orientations have prevailed: In a first variant, the link chain can rest straight on the peripheral surface, so that the planes spanned by the chain links run alternately perpendicular and parallel to the axial direction.
• the link chain can also be led obliquely over the pocket sprocket wheel or the peripheral surfaces, so that the planes spanned by the chain links extend approximately at an angle of 45 ° to 50 ° to the rotational or axial direction of the pocket sprocket.
• DE 197 31 A93 C1 deals with a pocket sprocket for a profile chain with a D-shaped profile cross-section.
• the chain is guided obliquely over the peripheral surface of the sprocket.
• Pocket sprockets for obliquely rising round steel chains are shown in DE 94 09 458 U1, DE 10 2004 009 A35 A1 and DE 20 2005 007 915 U1.
• the person skilled in the art achieves this object according to the invention in that the pocket sprocket wheel is manufactured in one piece from at least one fiber-reinforced plastic by means of an injection molding process.
• the plastic may be a glass fiber reinforced plastic.
• a glass fiber reinforced plastic has proved to be more advantageous over carbon fiber reinforced plastic in internal attempts to produce pocket sprockets, since pocket sprockets made of carbon fiber reinforced plastic seem to suffer rather brittle failure in continuous operation than pocket sprockets made of glass fiber reinforced plastic.
• the base of the pockets on which each chain link rests should have an increased flexural rigidity.
• the flexural strength of the pocket sprocket may be particularly increased at the bottom of the pockets from the interior.
• the load carried by the link chain builds up a high compressive stress, especially in the area between the pockets on the looped side of the pocket sprocket and the hub.
• the bending stiffness of the surface layer and the pressure stability of the interior of the sprocket can be adjusted by a temperature control of the mold and / or melt during the injection molding process.
• the pockets of the pocket sprocket according to the invention are preferably produced in a single manufacturing step together with the remaining pocket sprocket in the course of the injection molding process.
• the pockets are not reworked by, for example, a machining process.
• a non-chip-removing for example chemical or thermal after-treatment.
• the fiber length is at most 1 mm.
• the load capacity and the wear resistance of the plastic wheel can be increased according to a further advantageous embodiment, when the fibers of the fiber reinforced plastic with respect to a plane perpendicular to the axial center plane of the pocket chains Rades symmetric distribution of the main fiber directions. Since the loads of the pocket sprocket as a rule also run symmetrically to the center plane, in this embodiment, the inner structure of the pocket sprocket optimally adapted to the load case. Resilience and wear resistance of the pocket chain wheel can be further improved by the fact that the fibers of the fiber reinforced plastic in the interior of the pocket sprocket, preferably in the radially located central region between the pockets and a hub, have a substantially radial main fiber direction. In this advantageous development, the pressure forces directed inwards radially in relation to the axis of rotation can best be absorbed by the fiber structure.
• the fibers of the fiber-reinforced plastic can have a substantially surface-parallel main fiber direction at the bottom of the pockets.
• the main fiber direction at the bottom of the pockets may extend to one edge, ie axially, or in the circumferential direction.
• An axial major fiber direction at the base of the pockets has the advantage that tie lines are forced to the less loaded edge of the pocket sprocket in operation.
• weld lines may be formed at the points where the streams of plastic melt meet from several directions and then solidify. In the area of the weld lines, the main fiber direction is undefined.
• the invention therefore provides that the pocket sprocket has on its circumference at least one edge projecting radially with respect to the pockets, and that the weld line or weld line is largely, ie with a frequency of more than 50%, preferably almost exclusively or exclusively located in this border.
• the rim can fulfill a dual function by delimiting the pockets in the axial direction and thus forming a lateral guide for the chain links running onto the circumferential surface.
• two such edges may be provided to the two axial sides of the pockets.
• the edge is preferably designed to be continuous in the circumferential direction and can slop obliquely towards the middle, in order to allow a smooth running of the chain.
• the pocket sprocket may be further provided with an injection molded, torque transmitting shaft-hub connection.
• the shaft-hub connection for example, a groove for a tongue and groove connection, a cone or a spline, are preferably made in a single operation together with the rest of the pockets chain wheel.
• the pocket sprocket can also be provided with a shaft-hub connection made of an overmolded insert element.
• the pocket chain wheel can be provided with at least one over-molded metal disc which is perpendicular to the axial direction and extends between at least a portion of the pockets of the same orientation.
• the metal disc thus comes to lie between two successive pockets of the same orientation and prevents slippage of the link chain on the peripheral surface, even if the plastic material is broken at these points.
• the metal disc is preferably completely embedded in the pocket sprocket, so that it can not come into contact with the link chain in the region of the pockets, as long as the pocket sprocket is not damaged or worn beyond the permissible level.
• the metal disk can be provided with passages, so that the melt flow can pass through the metal disk.
• the metal disc may have axially projecting portion to the anchorage in the plastic matrix to improve.
• the metal disc may be stamped from sheet metal; likewise, the passages and / or projections may be stamped.
• the Taschenkettenrad has at least one end face with away in the topological sense path-related, for example disc-shaped end wall, in contrast to a spoke or truss-like configuration of the front page.
• a side effect of the design with an end wall is in comparison to spokes or truss lower tendency to contamination. This is particularly advantageous when using the pocket sprocket in areas with stringent hygiene regulations or in areas where substances are used that can permanently attack the plastic.
• the front wall can also form a continuous wall surface to provide even less dirt attack surfaces
• recesses extending axially into the pocket chain wheel are present in at least one end face or end wall. These recesses increase the damping characteristic of the pocket sprocket in both the radial and torsional directions.
• the recesses may be formed in particular blind hole-like.
• the recesses in the axial direction can overlap projections which in the circumferential direction each delimit pockets for similar chain links of the link chain and project in the axial direction.
• the projections may have a radially outward Shen facing surface, which is at the level of the radially outward Shen facing surface of at least one edge.
• the radially outer surface of the projection can continue smoothly in the corresponding surface of the edge. In this way, strength-reducing diameter jumps are avoided.
• the recesses in pocket sprockets for straight accumulating link chains can be arranged between the pockets for the horizontal chain links with planes extending parallel to the axial direction.
• the recesses on the two end faces can be axially opposite each other in such pocket sprockets.
• the recesses may be alternately arranged between similar pockets in the front side, in which the Bags that have less depth.
• the pocket sprockets with obliquely auf Anlagen link chain can be supported in some variants of the less deep portion of the pocket axially outward leg of a chain link.
• the volume of the recesses at one end face is at least equal to the volume of the axial protrusions separated, this end faces facing portions of the pockets at least approximately.
• the volume of a pocket located circumferentially between two consecutive projections may correspond to the volume of a recess.
• the opening of the recesses lying in the end faces of the pocket sprocket becomes narrower in the radial direction and / or the recesses taper in the axial direction into the pocket sprocket in the shape of pyramids or truncated pyramids, the formation of weld lines in this area can take place also be avoided.
• the base of the recesses may be located in the circumferential direction between similar pockets in order to achieve an improved flow of melt in the direction of the end faces.
• the pockets may be provided in the region of their circumferentially located center each with at least one receiving groove in which the welds of the chain links can be accommodated when the chain link rests in the pocket.
• the chain links are usually somewhat thickened, so that there is an increased risk of wear at the points where the weld with the pocket chain wheel comes into contact.
• the receiving groove opens in the radial direction, wherein the receiving groove widened in the radial direction to the outside, so that the welding can sewn seams easier even with link chains with rather coarse position tolerances.
• the opening angle in which the receiving groove radially outward Shen extended is at least about 1 10 ° to about 130 °, preferably about 120 °.
• the receiving groove can each be on the axial end face of a two similar pockets separating from each other, axially extending projection.
• Figure 1 is a schematic perspective view of an embodiment of a pocket sprocket according to the invention of injection-molded, fiber-reinforced plastic.
• FIG. 2 is a schematic sectional view through a further embodiment of a pocket sprocket according to the invention
• Fig. 3 is a schematic sectional view through a further embodiment of a pocket sprocket invention.
• the pocket sprocket 1 is preferably injection molded from a thermoplastic with a fiber reinforcement.
• a fiber reinforcement glass fibers are preferred.
• the plastic may have a density between 0.9 and 2.5 kg / dm 3 .
• the pocket chain wheel 1 is provided at its radially outward Shen facing peripheral surface 2 in the circumferential direction alternately differently shaped pockets 3, 4, in which the chain links of a link chain (not shown) are added during operation.
• the bags are mitgeformt in a manufacturing step in the course of the production of the entire pocket sprocket by means of a screen and / or a Schirmangusses and not reworked.
• FIG. 1 shows, by way of example only, a pocket sprocket for a round steel chain, which is guided over the peripheral surface 2 of the pocket sprocket 1 in a straight position, that is to say with horizontal and vertical chain links.
• the pockets 3, 4 each have a shape complementary to the chain links (not shown).
• the pockets 3 extend less far in the radial direction in the pocket chains wheel 1 as the pockets 4.
• the pockets 3 take the lying chain links, whose plane is parallel to an axial direction A.
• the pockets 4 receive the intervening standing, perpendicular to the axial direction A oriented chain links.
• the pockets 3 are separated by the lying in the center plane M of the pocket sprocket 1 pockets 4 in two axial sections 5, which are connected to each other in the circumferential direction U center of the respective pocket 3 by an axially extending web 6.
• the web 6 separates successive pockets 4.
• the pockets 4 are, in the axial direction A less wide than the pockets 3, but extend in the radial direction R deeper into the pocket sprocket. 1
• Axial direction A runs parallel to the direction of rotation of the pocket sprocket. 1
• the pockets 3, 4 are each offset by half a pocket pitch.
• the pockets 3, 4 not the shape shown in Fig. 1, but are designed according to complementary to the chain links.
• the pocket chain wheel 1 has two facing in the axial direction end faces 7, of which in Fig. 1, only one end face is visible.
• the non-visible end face 7 is configured in the embodiment of FIG. 1 as well as the visible end face, which is described below.
• the front side 7 has a broad area, ie not only in the region of spokes or truss sections, extending continuously from a hub 8 to the peripheral surface 2 end wall 9.
• the front wall 9 is in the topological sense away contiguous and preferably approximately disc-shaped.
• the end wall 9 may be provided with one or more recesses 10.
• the recesses may taper in the axial direction into the pocket sprocket.
• they can be configured with a cone or truncated cone, pyramid or truncated pyramid.
• the opening 12 of the at least one recess 10 lying in the plane 11 of the end wall 9 is trapezoidal in the embodiment of FIG. 1 and tapers in radial direction. outward. The opening 12 thus becomes narrower in the radial direction R to the outside.
• all edges 13 of the recess are strongly rounded to avoid the setting of dirt.
• the pocket chain wheel 1 in the embodiment shown by way of example in Fig. 1 is configured symmetrically with respect to the center plane M.
• the end walls 9 project beyond the pockets 3, 4 in the radial direction R and form an edge 14 projecting in the radial direction R.
• the rim 14 preferably contains all the weld lines of the pocket sprocket 1.
• the projections 15 face each other in the axial direction and bound the pockets 3 in the circumferential direction U.
• the projections 15 are also located in the circumferential direction U at the level of the centers of the pockets 4.
• the recesses 10 are circumferentially distributed so as to overlap axially with the projections 15.
• the volume of a recess 10 preferably corresponds to the volume of the portion 5 of a pocket 3, which is located between two successive projections 15 in the circumferential direction U and is arranged on the axial side of the corresponding recess 10.
• the recesses 10 ensure that during the production of the pocket sprocket 1, the melt passes through approximately constant flow cross sections, so that no excessive acceleration or deceleration of the melt flow occurs during the injection molding process.
• the recesses 10 ensure that at the radially outer ßeren edges of the pocket sprocket distributed over the circumference always about the same amount of material are present and, for example in the region of the projections 15 no mass concentrations occur. In this way, it is ensured that the binding seams are not located inside the pocket sprocket 1.
• the recesses 10 increase the damping properties of the pocket sprocket 1, so that its run when the chain is resting quieter, quieter with less vibration.
• the hub 8 may form an injection molded, torque transmitting shaft-hub connection.
• a groove 17 is shown by way of example for a tongue and groove connection.
• this shaft-hub connection can of course be injection-molded, for example, a cone hub or splined hub.
• an encapsulated insert element for example made of metal, may also be provided. be seen.
• the insert member may form the shaft-hub connection preformed, so that with the completion of the pocket sprocket, the shaft-hub connection is completed.
• the chain links of the link chains used in pocket sprockets are often made of a bent and butt welded wire and thickened in the region of the weld seam.
• a receiving groove 18, 19 is provided in each pocket 3, 4 in the region of the respective pocket center located in the circumferential direction.
• the receiving groove In the pockets 3 for the horizontal chain links is the receiving groove
• the receiving groove 18 at the bottom 20 of the pockets 3 and jumps back in the radial direction.
• the receiving groove 18 preferably spreads by an angle of between about 1 10 0 and about 130 °, preferably about 120 °.
• the receiving grooves 19 of the pockets 4 for the standing chain links are between the horizontal pockets 3 at the axially facing end faces 21 of the projections 15.
• the end faces 21 extend to the bottom of the pockets 4.
• the receiving grooves 19 widen outward in the radial direction at an angle between about 1 10 ° and about 130 °, preferably about 120 °.
• the receiving grooves 19 do not jump in the end face 21 as the receiving grooves 18 in the radial direction, but in the axial direction. In the radial direction inward, the receiving grooves 19 are initially narrower, and then continue in the radial direction with a constant width.
• the shape of the grooves 19 at the bottom of the pockets 4 corresponds to the shape of the grooves 18 at the base 20 of the pockets 3.
• the axially inwardly facing walls of the pockets 3 may be provided with an axially recessed receiving groove, the receiving groove 18 radially outward continues and in its embodiment of the receiving groove 19 in the region of the end faces 21 corresponds.
• FIG. 1 shows a schematic sectional view through the axial center plane M of a further embodiment of a pocket sprocket 1 perpendicular to the axial direction A.
• the standing chain links 23 lie in the deep and narrow pockets 4 in the axial center plane 4.
• the chain links 23, 24 may rest on the respective base 20, 26 of the pockets 3, 4.
• the chain links 23, 24 have a thickened weld 25.
• the recesses 10 (only one recess is exemplified) overlap in the axial direction A and a bottom 28 of the recesses 10 may be within the axial projection of the projection 15.
• the recess 10 may extend so deeply between two successive similar pockets 3 in the axial direction, so that the base 28 lies in the circumferential direction U between these pockets.
• Cutouts 29 schematically show the fiber-reinforced plastic in magnification.
• the main fiber direction 30, that is, the direction in which the majority of the plastic reinforcing fibers 31 is aligned, has in the interior I of the pocket chain wheel, in the area between the pockets 3, 4 and the hub 8, in the radial direction R.
• the main fiber direction 30 extends parallel to the surface, preferably in the axial direction A, in the direction of the edge 14. With respect to the center plane M, the main fiber directions 30 are distributed symmetrically.
• the radial main fiber direction 30 in the interior I of the pocket sprocket causes a high compressive strength and thus a high load capacity of the pocket sprocket. 1
• the surface-parallel fiber profile on and immediately below the pockets 3, 4 causes a high wear resistance of the respective pocket bottom 20, 26.
• the plastic has a flexural strength which is increased in relation to the interior I, so that the chain links are stable resting on the base 20, 26 of the pockets.
• the surface-parallel course of the main fiber direction 30 in the edge region has an increasing effect on the flexural rigidity.
• FIG. 3 shows an embodiment of a pocket sprocket 1 for an oblique chain chain 22.
• the same reference numerals are used below for the sake of simplicity.
• the pockets 3, 4 although due to the comparison with the embodiment of Figs. 1 and 2 changed chain position, although in detail other forms. Nevertheless, in principle the same elements as in the previous embodiment are present. As before, the pockets 3, 4 alternate in the circumferential direction U. Between each similar pockets is a projection 15, as shown in FIG. 3 can be seen from the pockets 4.
• each projection 15 is associated with a recess 10.
• the clarity is shown in Fig. 3, only a recess 10.
• the recesses on the two end faces 7 are likewise offset relative to each other by half a pocket pitch, corresponding to the associated projections.
• the receiving grooves 18, 19 are present at the respective pockets 3, 4, wherein the receiving grooves 18, 19 in the pockets 3, 4 each have the same shape.
• the grooves 18 are recesses in the axial direction and open in the radial direction to the outside Shen in an opening angle between 1 10 and 140 °.
• the orientation of the fibers in the interior I of the pocket chain wheel 1 is the same as in the embodiment of FIGS. 1 and 2.
• the main fiber directions 30 follow the symmetry of the pocket sprocket 1 as in the previous embodiment.
• the pocket chain wheel 1 may comprise at least one metal disc 33 or a pair of axially spaced metal discs 33 which are encapsulated by the fiber reinforced plastic.
• the at least one metal disc 33 is coaxial with the hub 8. It may be provided with passages 34 so as not to affect the melt flow in the manufacture of the pocket sprocket 1.
• the metal disk 33 viewed in the circumferential direction, extends between at least one kind of pockets 3 or 4, so that it can support the link chain 22 when the plastic matrix breaks.
• the metal disk 34 may be provided with axially projecting portions 35 for anchoring them more securely in the plastic matrix.
• the metal disk 33 may be a sheet metal stamped part.
• the passages 34 may be stamped.
• the sections 35 may be formed by punched and bent tongues.
• the metal disc can also be used in a chain bags wheel for straight accumulating chains.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Gears, Cams (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)

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Publications (1)

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ID=47088837

Family Applications (1)

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Citations (12)

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• 2011
  • 2011-11-10 DE DE102011055204A patent/DE102011055204A1/de not_active Withdrawn
• 2012
  • 2012-10-16 JP JP2014540379A patent/JP5951031B2/ja not_active Expired - Fee Related
  • 2012-10-16 WO PCT/EP2012/070503 patent/WO2013068208A1/de not_active Ceased
  • 2012-10-16 EP EP12779010.3A patent/EP2776741B1/de not_active Not-in-force
  • 2012-10-16 US US14/356,523 patent/US9512913B2/en not_active Expired - Fee Related

Patent Citations (12)

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