WO2007073712A1

WO2007073712A1 - Plate link chain for in particular a vehicle drive

Info

Publication number: WO2007073712A1
Application number: PCT/DE2006/002103
Authority: WO
Inventors: Marcus Junig; Anton Simonov; Olga Ispolatova; Michael Pichura
Original assignee: Luk Lamellen Und Kupplungsbau Beteiligungs Kg
Priority date: 2005-12-24
Filing date: 2006-11-29
Publication date: 2007-07-05
Also published as: DE112006003375A5; CN101346558A; EP1969251A1; KR20080077350A; CN101346558B; JP5391442B2; JP2009521647A

Abstract

The invention provides a plate link chain for in particular a vehicle drive, having a plurality of chain links (4) which are articulatedly connected to one another by means of thrust pieces (1, 13), wherein the thrust pieces run transversely with respect to the longitudinal direction of the plate link chain (2) and are arranged in openings (3) of the chain links, and wherein respective contact faces (14, 15) of curved design are arranged on the thrust pieces and on the chain links, along which contact faces (14, 15) the thrust pieces and chain links bear against one another for the transmission of force, and wherein rolling faces (5) of curved design are arranged on the thrust pieces, along which rolling faces (5) the thrust pieces roll on one another for the transmission of force, and wherein the thrust pieces are of asymmetrical design in the thrust piece height direction (H) in a cross section which runs in the longitudinal direction of the plate link chain, and wherein the contact faces are provided between the thrust piece and the chain link at the upper and lower contact face region in the thrust piece height direction, and wherein the thrust pieces, in the region of the rolling faces, have at least two regions (6,7) with different curvatures.

Description

Lashing chain for a particular vehicle drive

The present invention relates to a link chain for a particular vehicle drive, with a plurality of hingedly interconnected via pressure pieces link plates, the pressure pieces are transverse to the longitudinal direction of the link chain and are arranged in openings of the link plates and arranged on the pressure pieces and the link plates respective curved trained contact surfaces are along which abut the pressure pieces and link plates for power transmission to each other and arranged on the pressure pieces curved rolling surfaces are arranged along which roll the plungers for power transmission to each other and the plungers are formed asymmetrically in a running in the longitudinal direction of the link chain cross section in Druckstückhöhenrichtung and the contact surfaces on in Druckstückhöhenrichtung upper and lower contact surface area between the pressure piece and link plate are provided.

A plate chain of the type described input can be used in a vehicle drive. When used in a continuously variable belt pulley transmission (CVT) as part of the vehicle transmission, the pressure pads on specially shaped faces on which the tensile force between the conical disks and plate link chain is transmitted as a frictional force. In many other applications in the vehicle drive, the link chain is a toothed chain, which thus has teeth on at least one side, via which the tensile force is transmitted between the gears and the chain. Such a link chain in the form of a toothed chain can be used for example in a transfer case of a four-wheel drive motor vehicle or for bridging axle spacings to a differential o- example, as a power transmission means in a power take-off or for an auxiliary unit of the motor vehicle.

The link chain is made up of a plurality of link plates together, which are hingedly connected to each other via the pressing pieces and the link plates can be arranged in the form of link packs such that several link plates adjacent to each other and juxtaposed by the pressure pieces are interspersed, so then results in a link chain, which can transmit large forces loaded on train.

Such a link chain has become known, for example, from US Pat. No. 5,651,746. This known link chain has plungers that are used for power transmission to rolling surfaces abut each other. The radius underlying these rolling surfaces is referred to as optimal within a division-dependent window. It should be achieved so that the known link chain during a preload suffers no remaining damage in the area of the rolling surfaces. Now, if a tensile force is transmitted with this known plate chain, then it may be due to the geometry of the rolling surfaces of the plungers to an unfavorable force distribution in the contact surfaces of the plungers and the link plates, which increases the risk of twisting the rocker pressure pieces in the openings of the link plates and thus leading to voltage peaks, which favor a premature failure of the link chain.

Proceeding from this, the present invention is an object of the invention to provide a link chain in which a more favorable force distribution in the area of the contact surfaces of the pressure pieces and the link plates is present and thus the described problem is eliminated.

The invention now provides for achieving this object, a link chain with the features of claim 1. Advantageous embodiments thereof are described in the further claims.

The invention now provides a link chain for in particular a vehicle drive, with a plurality of hingedly interconnected via pressure pieces link plates, the pressure pieces are transverse to the longitudinal direction of the link chain and arranged in openings of the link plates and the pressure pieces and the link plates each curved trained contact surfaces are arranged, along which rest the pressure pieces and link plates for power transmission to each other and arranged on the pressure pieces curved Wälzflächen along which the pressure pieces for power transmission to each other and the plungers are formed asymmetrically in a running in the longitudinal direction of the link chain cross-section in Druckstückhöhenrichtung and the contact surfaces are provided in Druckstückhöhenrichtung upper and lower contact surface area between pressure piece and link plate, wherein the pressure pieces in the de R rolling surfaces have at least two areas with different curvatures.

A link chain of the type in question has in the elongated load area a contact area between the pressure pieces, which differs from the contact area in case of buckling, so if the link chain on a sprocket or a pair of conical disks undergoes a direction reversal. The contact area between the pressure pieces or Wegedruckstücken located in the elongated load space below a rolling surface in Druckstückhöhenrichtung imaginary halving line and in case of buckling above this line. The present invention makes use of this finding advantageously and provides rolling surfaces with at least two regions with different curvatures. Thus, the rolling movement of the plungers can be optimized each other by adjusting the curvatures in the area of the rolling surfaces, for example, with respect to a reduction of the surface pressure in the contact surface area of the rocker and the pieces according to a wear reduction at the contact points of the rocker.

The invention can now be further developed in that within the at least two regions, the curvature is always the same, that is, for example, the radii of curvature of the two regions differ, but within a respective range of curvature radius is constant.

According to a further modification, it is provided that within at least one region a curvature variable along the rolling surface is provided. Thus, at least two regions are provided with from region to region of another curvature, and in at least one of the regions, the curvature along the rolling surface can also change, that is to say be variable along the rolling surface, for example. If in each case identical curvatures are provided in the interface area between the at least two regions, whereby this is to be seen infinitesimally, and the curvature changes along the rolling surfaces of the at least two regions, then this also includes an embodiment of the rolling surfaces of the pressure elements extending along the entire rolling surface is variably designed and therefore determined, for example by means of a mathematical function as a generator.

It is quite generally provided according to the invention that the curvature is smaller in the region of the second contact region of two adjoining pressure pieces which adjusts in the straight lashing chain center during tensile loading than in the region of the first contact region of the adjacent pressure pieces which adjusts in the event of a kink. If the plate-link chain according to the invention runs between the two reversal points, which are formed, for example, by two gears or two pairs of conical disks in a conical-pulley transmission, then a contact area between the rocker pressure pieces below the imaginary center line described above occurs in the plate-link chain according to the invention, and the plate-link chain according to the invention now appears by the fact that in these In the second contact region, the curvature is smaller than in the contact region of the pressure pieces in the event of buckling, which lies above the above-imaginary center line. If now both regions are formed by radii which differ from one another, then the radius in the first, that is to say upper, contact region is smaller than in the second, lower contact region. Even if the rolling surfaces are formed with variable radius over the entire arc length of the rolling surface, it is provided according to the invention that the radius in the second contact region is greater than in the first contact region.

The curvature in the second contact region is chosen according to the invention so that the contact point or contact area between two adjacent pressure pieces in Druck- piece height direction is shifted in the direction of the pressure piece height center. This ensures that the pressure force transmission between the two opposing rocker pressure pieces in the straight Laschenkettentrum runs so that the adjusting at the respective contact surfaces of the pressure pads and link plates reaction forces on the lower contact surface and the upper contact surface largely uniformly distributed and there is no significant unequal distribution, such as this is the case in the known link chain, since such an unequal distribution leads to a Verdrehneigung the rocker pressure piece in the opening of the link plate. It is also provided according to the invention that the curvature in the first, so upper contact area is selected so that the contact point or contact area between two adjacent pressure pieces in Druckstückhöhenrichtung is also shifted in the direction of the pressure piece height center. This ensures that the contact area for power transmission between the two rocker pressure pieces in the buckling case between the upper and lower contact surfaces of the rocker plates or link plates and thus on the one hand the Verdrehneigung the plungers in the opening of the link plates counteracted and on the other hand a more uniform force distribution between the upper and lower contact surfaces is achieved.

The invention can now be further developed in that the ratio of the curvatures of the second contact region to the first contact region is in the range from about 0.25 to about 0.9, preferably 0.25 to about 0.83.

Thus, the curvature of the first contact region can be from about 1.2 times to about 10 times the curvature of the second contact region, the curvature of which in each case is smaller than the curvature of the first contact region. A curvature ratio recognized as being advantageous lies in the range of approximately 0.5, that is to say the curvature of the second contact region is half the curvature of the first contact region and, in the case of a further In another advantageous embodiment, the ratio of the curvature of the second contact region to the curvature of the first contact region is approximately 7:16.

Quite generally, the curvature in the second contact region is chosen such that the force distribution which occurs in the region of the abutment surfaces of the pressure piece and the link plate counteracts a tendency of the rocking piece to be displaced in relation to the link plate.

The rolling surfaces of the rocker pressure pieces have at least two areas with different curvatures and each along the rolling surface on a certain arc length and it is provided according to the invention that the ratio of the arc lengths of the area with a smaller curvature, this is the second contact area to the area with greater curvature this is the first contact area, about 1 to 2. Thus, the requirement can be taken into account that the link chain can take a large bending angle in the direction reversal on a gear or a conical disk pair.

The rolling surface forms in the upper Wälzflächenbereich considered in Druckstückhöhenrichtung upper beginning of the first contact area and also in the lower Wälzflächenbereich considered in Druckstückhöhenrichtung lower beginning of the second contact surface area. If now both contact surface region starts are connected to an imaginary rectilinear path and a perpendicular straight line is drawn, it is provided according to the invention that a center of at least one of the two circular arc segments outside one on a center of this connection path of the end points of the areas of the rolling surface drawn Lotgerade lies, especially in Druckstückhöhenrichtung above this Lotgeraden.

The invention will now be explained in more detail below with reference to the drawing. This shows in:

Fig. 1 is a plan view of a schematically illustrated rocker pressure piece according to an embodiment of a link chain according to the present invention;

FIG. 2 shows a view of a weighing-pressure piece according to a modified embodiment of the plate-link chain; FIG.

3 shows a detail of a link chain according to the present invention; 4 is a plan view of a pressure piece pair of a link chain according to the present invention for explaining a displacement of a contact surface area.

Fig. 5 is a view similar to Fig. 4;

Fig. 6 in two views an explanation of the force distribution in the load case in a known link chain;

Fig. 7 is a view similar to Figure 6 for explaining the force distribution in a link chain according to the present invention.

FIG. 8 is an illustration of a pressure piece pair for explaining the surface pressure distribution which occurs in the event of loading; FIG. and

Fig. 9 is an illustration for explaining geometric relationships.

Fig. 1 shows in a plan view a pressure piece 1 of a link chain 2 (Fig. 3) according to the present invention.

As can be readily seen, the pressure piece 1 is formed asymmetrically in pressure piece height direction, thus has in the upper region in the width direction (double arrow B) in the direction (arrow L) of the link chain 2 greater width extension. In the case of installation, that is, when the pressure piece is arranged together with another pressure piece in an opening 3 of a link plate 4, this pressure piece 1 another pressure piece 13 is arranged opposite one another, so that both pressure pieces roll on a curved rolling surface 5 opposite each other.

The pressure piece 1 in this case has a first contact area 6, which then adjusts when the pressure piece 1 rolls together with the thrust piece 13 lying opposite him in case of buckling, said buckling case is shown for example in Fig. 3 of the drawing. The rolling surface 5 of the pressure piece 1 also has a second contact area 7, on which the two pressure pieces roll off each other when the plate chain is exposed in the straight straps chaining a tensile load. The dotted lines shown in Fig. 1 of the drawing in the first contact area represent the length of the radius starting from the center 8 shown in FIG. 9 of the drawing, from which the first contact area 6 is formed, this radius in Fig. 9 with Ri is designated. Similarly, the dotted lines shown in FIG. 1 in the second contact region 7 show the radius at which the rolling surface 5 is formed in the second contact region 7 and which starts from the center point designated 9 in FIG. 9 - and in FIG. 9 represented by R ₂ . As is readily apparent from FIGS. 1 and 9 of the drawing, the radius R _{2 is} greater than the radius Ri, so that the curvature of the rolling surface in the region of the second contact region 7 is smaller than the curvature of the rolling surface 5 in the first contact region 6th

Fig. 2 of the drawing shows a pressure piece 10 according to a modified embodiment of a plate chain, the rolling surface 11 over the entire arc length has a continuously changing radius, which in turn is shown in Fig. 2 with reference to the dotted lines 12, the envelope is shown in solid ,

Fig. 4 of the drawing shows a pressure piece pair in a plan view for explaining a shift of the contact point or contact surface area between the rocker pressure piece 1 and 13 from Pi to P _r . In this case, Pi is the contact area which would set in a known link chain and is shown for reference purposes, while Pr is the contact surface area which occurs in the link chain according to the present invention, namely in the straight link chain center. As will be readily apparent, the contact surface area has been further displaced toward a die center M.

Similarly, Fig. 5 shows a representation of the cradle pair having a pad area P ₂ corresponding to the location of the pad area in a known link chain and drawn for reference purposes in the buckling case illustrated in Figure 3 of the drawing, while P ₂ - Position of the contact surface area in the described load case of the plate-link chain according to the invention. As is readily apparent, the contact surface area between the two pressure pieces 1, 13 has been moved in the direction of the Druckstückhöhenmitte M also in this load case.

The effect of this displacement is now apparent from FIGS. 6 and 7 of the drawings. Fig. 6 of the drawing shows in the left half of the drawing, the force distribution in the straight Laschenkettentrum a known link chain, wherein the impressed at point P ₁ force F divides into acting on a lower contact surface 14 at point B force F ₆ , which is greater than the acting on the upper contact surface 15 at point A force F _A , so that due to the uneven force distribution indicated by the arrow 16 tendency of the pressure element 1 for twisting in the opening 3 of the link plate 4 is. In a comparable manner, FIG. 6 shows in the right-hand half of the drawing the force distribution in the event of a buckling load, so that the force F at point P _{2 is divided} into force components F _B and F _A that are distributed significantly unevenly in terms of magnitude, namely in the lower contact surface 14 and the upper contact surface 15th

Fig. 7 shows in the left half of the drawing corresponding to the left half of the drawing in Fig. 6 load case on an inventively designed tab chain.

As can readily be seen, the displacement of the point of application of force from P ₁ to P _r in the direction of the middle of the pressure piece leads to a marked change in the unequal distribution of the reaction forces F ₆ and F _A to approximately equal forces. Also decreases the expressed with the length of the arrow 16 inclination of the pressure piece 1 for twisting in the opening 3 of the link plate 4 significantly.

Fig. 7 shows in the right half of the drawing the right half of the drawing of FIG. 6 corresponding load case, wherein the displacement of the contact surface area P ₂ to P ₂ 'in the direction of Druckstückhöhenmitte the resulting reaction forces F _A and F _{B are} much less different in the right half of the drawing of FIG. 6, so that according to the corresponding component voltages in the link plate decrease accordingly and thus the risk of cracking in the link plate is reduced.

FIG. 8 of the drawing now shows a qualitative course of the surface pressure in the second contact region 7 of a pressure piece pair 1, 13 of a plate-link chain 2 according to the invention.

The illustration makes it clear that due to the smaller curvature in the region of the second contact region 7 a surface pressure distribution is the result, which is homogeneous due to the small curvature and not, for example, in the height direction (double arrow H) compressed lens corresponds, as in Known link chains is the case. FIG. 9 of the drawing now shows that the centers 8, 9 of the radii which serve to form the first contact region 6 and the second contact region 7 are above a vertical straight line 17 which defines the connection path between the beginning 18 of the first contact region 6 and viewed at the beginning 19 of the second contact region 7 in each case viewed in the pressure piece height direction H outside, divides at the Lotmitte. The longitudinal extension of the first contact region 6, that is to say the arc length along the rolling surface 5, has approximately twice the arc length of the rolling surface 5 in the region of the second contact region 7.

With the plate-link chain according to the invention, therefore, a significantly more even force distribution between the contact surfaces of the rocker-pressure pieces and the link plate is achieved, so that the danger of stress cracks on the link plate is correspondingly reduced. Also, due to the different curvatures in the area of the rolling surfaces of the rocker pressure pieces, the different load cases in the straight link chain center and in the buckling case are taken into account.

With regard to features of the invention which are not explained in greater detail above, reference is expressly made to the claims and the drawings, moreover.

LIST OF REFERENCE NUMBERS

1 pressure piece

link chain

opening

link plate

rolling surface

6 first contact area

7 second contact area

8 center point

9 center point

10 pressure piece

11 rolling surface

12 dotted line

13 pressure piece

14 lower contact surface

15 upper contact surface

16 arrow

17 Lot straight

18 beginning

19 beginning

B width direction

M center point

L running direction

H height direction

Claims

claims

1. Lashing chain for a particular vehicle drive, with a plurality of pressure pieces (1, 13) hingedly interconnected link plates (4), wherein the plungers (1, 13) transverse to the longitudinal direction of the link chain (2) and in openings (3) the link plates (4) are arranged and on the pressure pieces (1, 13) and the link plates (4) respective curved trained contact surfaces (14, 15) are arranged, along which the pressure pieces (1, 13) and link plates (4) for power transmission abut each other and on the pressure pieces (1, 13) curved trained rolling surfaces (5) are arranged along which roll the pressure pieces (1, 13) for power transmission to each other and the plungers (1, 13) in a longitudinal direction of the link chain (2) extending cross-section in Druckstückhöhenrich- direction (H) are formed asymmetrically and the contact surfaces (14, 15) in the pressure piece height direction upper and lower contact surface area zwisc hen pressure piece (1, 13) and link plate (4) are provided, characterized in that the pressure pieces (1, 13) in the region of the rolling surfaces (5) at least two regions (6, 7) having different curvatures.

2. Lashing chain according to claim 1, characterized in that within the at least two regions (6, 7), the curvature is always the same.

3. Lashing chain according to claim 1, characterized in that within at least one region (6, 7) along the rolling surface (5) variable curvature is provided.

4. Lashing chain according to one of the preceding claims, characterized in that the curvature in the region of the tensioning in the straight link chain adjusting adjusting second contact region (7) of two adjacent thrust pieces (1, 13) is smaller than in the region of the im Knickfall adjusting first contact region (6) of the adjacent thrust pieces (1, 13).

5. plate link chain according to claim 4, characterized in that the curvature in the second contact region (7) is selected so that the contact point between two adjacent pressure pieces (1, 13) in Druckstückhöhenrichtung in the direction of the pressure piece height center (M) is shifted.

6. plate link chain according to claim 4 or 5, characterized in that the curvature in the first contact region (6) is selected so that the contact point between two adjacent pressure pieces (1, 13) in Druckstückhöhenrichtung in the direction of the pressure piece height center (M) moved is.

7. plate link chain according to one of claims 4 to 6, characterized in that the ratio of the curvatures of the second contact region (7) to the first contact region (6) in the range of 0.25 to about 0.9, preferably 0.25 to about 0.83.

8. plate link chain according to one of claims 4 to 7, characterized in that the ratio of the curvatures of the second contact region (7) to the first contact region (6) is about 0.5, and in particular 7 to 16.

9. plate link chain according to one of claims 5 to 8, characterized in that the curvature in the second contact region (7) is selected so that in the region of the contact surfaces (14, 15) of the pressure piece (1, 13) and the link plate (4) adjusting force distribution of a Verdreigung the pressure piece (1, 13) relative to the link plate (4) counteracts.

10. Lashing chain according to one of the preceding claims, characterized in that the regions (6, 7) along the rolling surface (5) each have an arc length and the ratio of the arc lengths of the region (7) with a smaller curvature to the region (6) greater curvature is about 1 to 2.

11. Lashing chain according to one of the preceding claims, characterized in that at least one region (6, 7) is a circular arc segment, the center (8, 9) outside of a center of a connecting distance outside starting (18, 19) of the areas ( 6, 7) on the rolling surface (5) drawn Lotgerade (17).