DE102020128837A1 - Rocker pressure piece for a rocker pressure piece pair of a link chain - Google Patents

Abstract

The invention relates to a rocker pressure piece (1, 2) for a rocker pressure piece pair (3) of a link chain (4), comprising: a length extension (5) which is aligned in the axial direction (6) in use in a link chain (4); Height extension (9), which is aligned in the radial direction (7) during use in a link chain (4); - a width extension (10) which is aligned in the chain running direction (8) during use in a link chain (4); - a link-side contact surface (11) with an outer contour (12) for contact with a plate (13, 14) in use in a plate-link chain (4); and - a rolling surface (15) for contact with a further rocker pressure piece (2,1) in use in a rocker pressure piece pair (3), - an axial securing element (16) attached to the rocker pressure piece (1,2) for securing the rocker pressure piece (1,2 ) when used in a link chain (4). The rocker pressure piece is primarily characterized in that the axial securing element (16) is designed as a rod element with a longest extension in the direction of the rod (17), the rod element in the direction of the rod (17) over the entire surface with the outer contour (12) of the rocker pressure piece (1,2) is in contact. With the rocker pressure piece proposed here, a high shear strength of the axial securing element and thus a high level of security against losing a rocker pressure piece or a tab is created with simple means.

Description

The invention relates to a rocker pressure piece for a rocker pressure piece pair of a link chain, a rocker pressure piece pair with such a rocker pressure piece for a link chain of a belt drive, a plate chain with such a rocker pressure piece pair for a belt drive of a drive train, a belt drive with such a plate chain for a drive train, and a drive train such a belt drive.

From the prior art rocker pressure pieces for a rocker pressure piece pair of a link chain are known as belt means for belt transmissions, for example a so-called CVT [continuous variable transmission], as traction means. Such a CVT is, for example, from DE 100 17 005 A1 known. Such a link chain is set up for the transmission of high torques and high speeds, as are known, for example, from engine construction for motor vehicles. The rocker pressure pieces or the tabs have previously been secured via welded-on axial securing elements, for example a welded-on thin wire. This prevents the rocker pressure pieces from falling out of the link plate assembly of the link chain or the outer link plates from falling. In individual cases, however, this securing method fails, i.e. rocker pressure pieces can either fall off during production, during transport, when installing the link chain in the belt drive, or over the course of time due to insufficient shear strength. A missing rocker pressure piece usually leads to an early failure with breakdown at the end customer. One possible solution is to provide a larger welded connection between the axial securing element (for example wire) and the rocker pressure piece. Although this increases the strength and thus reduces the risk of lost rocker pressure pieces, the increase in welding energy required for this increases the risk of impermissible heat-affected zones on the rocker pressure piece. Another method that is frequently used in practice for link chains is the caulking (plasticizing) of the pin ends of the rocker pressure pieces on both sides. However, there is usually no press fit with link chains. A significantly higher degree of deformation would therefore be required to ensure that no rocker pressure piece or tab is lost. Because the rocker pressure pieces have a very high degree of hardness, such high degrees of deformation cannot be implemented, or at least not cost-effectively. The aim is always a long service life for the plate-link chain, as freedom of exchange as possible over the service life of a motor vehicle, and a high degree of efficiency. A link chain with rocker pressure pieces is known, for example, from WO 2016/095 913 A1.

Proceeding from this, the present invention is based on the object of at least partially overcoming the disadvantages known from the prior art. The features according to the invention emerge from the independent claims, for which advantageous configurations are shown in the dependent claims. The features of the claims can be combined in any technically meaningful manner, with the explanations from the following description as well as features from the figures, which include additional embodiments of the invention, can also be used for this purpose.

• - eine Längenerstreckung, welche im Einsatz in einer Laschenkette in Axialrichtung ausgerichtet ist;
• - eine Höhenerstreckung, welche im Einsatz in einer Laschenkette in Radialrichtung ausgerichtet ist;
• - eine Breitenerstreckung, welche im Einsatz in einer Laschenkette in Kettenlaufrichtung ausgerichtet ist;
• - eine laschenseitige Anlagefläche mit einer Außenkontur zum Kontakt mit einer Lasche im Einsatz in einer Laschenkette; und
• - eine Wälzfläche zum Kontakt mit einem weiteren Wiegedruckstück im Einsatz in einem Wiegedruckstückpaar,
• - ein an dem Wiegedruckstück befestigtes Axialsicherungselement zum Sichern des Wiegedruckstücks beim Einsatz in einer Laschenkette.

The invention relates to a rocker pressure piece for a rocker pressure piece pair of a link chain, comprising:

• a length which is aligned in the axial direction in use in a link chain;
• - A vertical extension which is aligned in the radial direction in use in a link chain;
• - A width extension which, in use in a link chain, is aligned in the chain running direction;
• - A plate-side contact surface with an outer contour for contact with a plate in use in a plate-link chain; and
• - a rolling surface for contact with another rocker pressure piece in use in a rocker pressure piece pair,
• - An axial securing element attached to the rocker pressure piece for securing the rocker pressure piece when used in a link chain.

The rocker pressure piece is primarily characterized in that the axial securing element is designed as a rod element with a longest extension in the direction of the rod, the rod element being in full surface contact in the direction of the rod with the outer contour of the rocker pressure piece.

In the following, reference will be made to the spatial directions mentioned if the chain running direction, axial direction or radial direction and corresponding terms are used without explicitly indicating otherwise. Unless explicitly stated otherwise, ordinal numbers used in the preceding and following description are only used for clear distinction and do not reflect any order or ranking of the components identified. An ordinal number greater than one does not mean that inevitably another such component must be present.

The rocker pressure piece proposed here can be used in a rocker pressure piece pair with a further rocker pressure piece. The two rocker pressure pieces of a rocker pressure piece pair are each in force-transmitting contact with their rolling surface and, when used in a plate-link chain, their plate-side contact surfaces are in force-transmitting contact with one (other) associated plate. For this purpose, a rocker pressure piece has a longitudinal extent which, in use, is aligned parallel to the axial direction. The axial direction is defined as a direction parallel to the axes of rotation of the cone pulley pairs. The link plates of a link chain are suspended adjacent to one another in the axial direction on the rocker pressure piece pair or the majority of the rocker pressure piece pairs of the link chain. Furthermore, the rocker pressure piece has a vertical extent which is aligned parallel to the radial direction. The radial direction is defined on the looping circle formed by a link chain, this shape being generally oval in use, i.e. two centers (with the axes of rotation of the conical pulley pairs) are formed which are connected by a center line. The radial direction is defined as positive, starting from the center line (within the circle of wrap) and running outwards (to the outside of the circle of wrap). Inside the circle of wrap is referred to here as radially inside and outside of the circle of wrap is referred to here accordingly as radially outside. The third spatial direction is the chain running direction, which in use depends on the location in the looping circle and thus the three spatial directions mentioned here are to be viewed as a co-moving coordinate system. The width of the rocker pressure piece is aligned parallel to the direction of travel of the chain. In a preferred embodiment, a rocker pressure piece has an oval, approximately teardrop-shaped, cross-section (with the axial direction as the normal), the rocker pressure piece, for example, being narrow radially on the inside and wider on the radial outside. The height extension is defined as the maximum extension in the radial direction and the width extension as the maximum extension in the chain running direction (in a straight section of the link chain, i.e. in use in the ideally tensioned strand).

At the end, that is to say in a view in the axial direction, an end face is provided in each case, which is set up in force-transmitting, preferably frictional, contact with the corresponding (conical) surface of the conical disk pairs. In addition to the (axial) area of the tabs, which are arranged in a plurality as a group of tabs along the length of the respective rocker pressure piece pair, an axial protrusion is formed from the rocker pressure piece up to a respective end face. An axial securing element is provided in this area of at least one of the two protrusions so that a rocker pressure piece is prevented from slipping out axially and the tabs (at least on this side) are prevented from falling. For example, one of the two protrusions is designed with a bolt head for a form fit. Alternatively, an axial securing element is provided on both sides as proposed here. An axial securing element as proposed here can be attached after it has been introduced into a link chain or into the eyelets provided in a link group. The axial securing element is designed here as a rod element. It thus has a longest extension along a bar line. In the case of a bar element, the bar line is defined as that (theoretical) line which, for example, for a bar element with a symmetrical cross section, can be drawn through the respective centroid of infinitesimal surface pieces of the bar element. Alternatively, the line is defined on another row of points (defined identically in every infinitesimal area of the rod element). In the case of a straight bar element, the length of the bar line is identical to the length of the bar element. For example, the bar line corresponds to the neutral line of the bar element. A cross section of the rod element can be described with the intersection of the rod line with the cross section as the center by means of two-dimensional polar coordinates.

It is now proposed here that the rod element be connected over the entire surface to the outer contour of the contact surface on the tab side. The frictional connection, for example a frictional connection or adhesive connection in the case of a punctiform welded connection, between the axial securing element and the tab-side contact surface is significantly increased compared to previously known embodiments. This creates an increased shear strength. A full-surface connection is preferably the entire (inner) surface of the rod element which faces the contact surface on the tab side. In the case of a rounded inner surface of the rod element, not only a line contact (along the rod direction) is preferably formed, but to the side of it in the axial direction, for example by means of welding and / or melting of the inner surface under pressure, the contact surface is enlarged during the fastening process.

Deviations from an ideal full-surface connection due to permissible manufacturing tolerances, for example the formation of cavities during the welding process, are not part of the definition of a ( The full-surface connection to be striven for cannot be ruled out, although preferably to be avoided.

It is also proposed in an advantageous embodiment of the rocker pressure piece that the axial securing element is aligned parallel to the bracket.

In this embodiment, the axial securing element or the rod direction is aligned parallel to the tab. A small installation space is thus required of the axial securing element. In some applications, this leads to a small required axial size of the link chain. Deviations from an ideally parallel alignment of the axial securing element as a result of permissible manufacturing tolerances or assembly tolerances are not excluded from the definition of a (desirable) parallel alignment.

It is also proposed in an advantageous embodiment of the rocker pressure piece that the axial securing element extends in the direction of the rod over a large part of the contact surface on the tab side,
preferably over at least 80%, particularly preferably over the entire radially extending radial portion, of the tab-side contact surface.

In this embodiment, the axial securing element extends in the direction of the rod over a long contact surface, so that the shear strength is massively increased compared to previously known embodiments with punctiform connections with also a small connection surface. In a preferred embodiment, the axial securing element is connected to the entire radial portion of the tab-side contact surface, which is arranged so as to overlap in the direction of the rod. A complete detachment of the axial securing element is thus almost impossible even in the event of a shear load on the axial securing element that exceeds the design forces. A break in operation (breakdown in the motor vehicle area) is therefore excluded.

• - Schmelzschweißen;
• - Kontaktschweißen;
• - Punktschweißen, bevorzugt mittels einzig eines radial-äußeren Schweißpunkts und eines radial-inneren Schweißpunkts; und
• - Aufschrumpfen, wobei bevorzugt das Axialsicherungselement vor der Montage erhitzt wird.

It is further proposed in an advantageous embodiment of the rocker pressure piece that the axial securing element is connected to the rocker pressure piece by means of at least one of the following joining methods:

• - fusion welding;
• - contact welding;
• - Spot welding, preferably by means of only one radially outer welding point and one radially inner welding point; and
• - Shrinking, the axial securing element preferably being heated prior to assembly.

Fusion welding according to the present definition includes all welding processes using a separate welding anode, in which the material of the components to be connected (here the rocker pressure piece and the rod element) is melted close to the surface. In this case, a filler metal (for example welding wire) is generally used to form a material application, for example a fillet weld. A connection point comparable to a one-piece embodiment with a continuous grain structure designed in accordance with the temperature control is thus formed in the heat-affected zone. A full-surface (preferably fusion) welded connection is advantageous for high shear strength. For a slight influence on the material structure (small overall heat-affected zone) of the preferably hardened rocker pressure piece, the heat input (into the depth) via the connecting surface is less than when welding points are made. In a preferred embodiment, a weld seam is guided parallel to the rod direction over the entire extension of the rod element or even formed circumferentially, with the strength quality and thus the amount of heat input being particularly preferred, be it by means of a shortened time and / or by means of a lower temperature and / or changed Material choice of a filler metal is reduced. The shear strength is nevertheless increased by means of the enlarged contact area.

In contact welding, the two components to be connected to one another (here the rocker pressure piece and the rod element) are placed under electrical voltage as anode and cathode, so that the materials fuse with one another at the contacting interfaces. In contrast to fusion welding according to the above definition, there is no material application and generally no welding consumables are used. The advantage here is the accessibility of a full-surface connection with a small expansion of the (total) heat-affected zone, and in particular a low heat-affected depth.

In the case of spot welding, the two components to be connected to one another are pressed against each other (here the rocker pressure piece and the rod element), with an electrical voltage being transmitted from the pressing device the two components to be connected to each other is applied, so that a weld connection is created in the pressure point, which is comparable to that of contact welding. For example, a frictional connection or adhesive connection is formed between the rod element and the tab-side contact surface in the remaining overlapping areas. The advantage here is the accessibility of a very small (total) heat-affected zone with a low heat-affected depth with a well-defined pressing force of the two components with little effort. A few welding points are preferably set, for example in each case on narrow radii of the outer contour of the contact surface on the tab side.

When shrinking, which is preferably used as the only connection method, a press fit is formed between the rod element and the tab-side contact surface, the rod element being seated in a clamp-like manner on the tab-side contact surface. In this way, mutually antagonistically aligned contact surfaces are formed between the rod element and the contact surface on the tab side, so that they accomplish the compression molding. In a preferred embodiment, only the axial securing element is heated, that is to say the rocker pressure piece is not undercooled. A pair of plates or a plate chain can thus be preassembled and the (heated) axial securing elements can be attached to the respective rocker pressure piece in a simple manner, that is to say without separate temperature control of the mounted rocker pressure pieces. In one embodiment, at least one welding point is additionally formed, for example solely to secure the purely force-fitting connection as a result of the shrinking on.

According to a further aspect, a rocker pressure piece pair for a link chain of a belt drive is proposed, having
two rocker pressure pieces, of which at least one is designed according to an embodiment according to the description above, wherein
preferably the rocker pressure pieces of the rocker pressure piece pair are made identical.

The pair of rocker pressure pieces proposed here comprises two rocker pressure pieces, at least one of the two rocker pressure pieces being designed according to an embodiment according to the preceding description, preferably both rocking pressure pieces being designed according to an embodiment according to the preceding description. The pair of rocker pressure pieces is preferably preassembled in a corresponding eyelet of a plate group before the axial securing element is attached to the (respective) plate-side contact surface of the two rocker pressure pieces or at least one of the two rocker pressure pieces. In one embodiment, the axial securing element is only attached to one of the two (axial) sides of the at least one of the two rocker pressure pieces of the rocker pressure piece pair and a bolt head, for example, is formed on the other (axial) side. In one embodiment, an axial securing element according to an embodiment according to the preceding description is attached (axially) on both sides of the at least one relevant rocker pressure piece of the rocker pressure piece pair, the axial securing element preferably being attached to one (axial) side before it is inserted into the respective eye of the tab group .

• - eine Vielzahl von Laschen; und
• - eine korrespondierende Anzahl von Wiegedruckstückpaaren, wobei zumindest ein Wiegedruckstückpaar, bevorzugt ausschließlich Wiegedruckstückpaare, nach einer Ausführungsform gemäß der obigen Beschreibung umfasst ist,

wobei mittels der Laschenkette ein Drehmoment zwischen einem ersten Kegelscheibenpaar und einem zweiten Kegelscheibenpaar reibschlüssig übertragbar ist,
wobei ein Übersetzungsverhältnis zwischen den Kegelscheibenpaaren bevorzugt stufenlos veränderbar ist.According to a further aspect, a link chain for a belt drive of a drive train is proposed, having at least the following components:

• - a variety of tabs; and
• a corresponding number of rocker pressure piece pairs, at least one rocker pressure piece pair, preferably exclusively rocker pressure piece pairs, being included according to an embodiment according to the above description,

wherein by means of the link chain, a torque between a first pair of conical disks and a second pair of conical disks can be transmitted in a frictionally engaged manner,
wherein a transmission ratio between the conical pulley pairs is preferably continuously variable.

The link chain proposed here is set up as a traction device for a belt drive, for example for a CVT. In the case of a belt drive, a link chain forms a loop section on the transmission shafts and two strands between them, one being a tension strand or a load strand and the other being a slack strand. The strands and the looping circle sections together form an (oval) looping circle, as explained above. As far as a circle of wrap is spoken of, this does not mean a circle with a constant radius, but a circumferentially closed structure. The shape is defined by the effective circles (set by means of a pulley distance) of the conical pulley pairs of the belt drive. The spatial directions are also defined here as explained above.

The link chain has a chain width and over this chain width a plurality of link plates are generally arranged adjacent to one another and form a link plate group. In use, the chain width is aligned parallel to the alignment of the at least two transmission shafts. The The chain width is defined by the length extension of the rocker pressure pieces, with the (axial) ends of the rocker pressure pieces protruding beyond the adjacent plates of a plate group so that the plates do not come into frictional contact with the corresponding surface of the conical pulley pairs.

The link chain comprises a plurality of link plates, a plurality of link plate types preferably being provided for a (as explained above) reduced noise emission, for example two link plate types, namely a short link plate and a long link plate. The brackets connect two pairs of rocker pressure pieces to transmit tensile force. A rocker pressure piece pair has a fixed rocker pressure piece and a free rocker pressure piece in relation to a bracket. Two tabs are each connected to one another by means of a common pair of rocker pressure pieces in a manner that transmits tensile force, the designation of the respective other tab as a free or fixed rocker pressure piece then being reversed in each case. The two rocker pressure pieces of a rocker pressure piece pair lie directly against each other in a force-transmitting manner due to the tensile force transmitted by the link plates of the link chain during operation of the belt drive and thus the link load acting on the rocker pressure piece pair (on both sides in the chain running direction). The two rocker pressure pieces of the rocker pressure piece pair transmit the tensile force of the tabs to each other as a compressive force and roll on each other during the movement in a belt transmission by means of their force-transmitting rolling surfaces lying against each other. The rolling surfaces are curved or kinked and thus describe a rocking movement on each other when the belt drive is in operation.

In a preferred embodiment, the link chain is set up as a belt for a continuously variable transmission and the end faces of the rocker pressure pieces of the link chain are in force-transmitting contact with the corresponding (conical) surfaces of the conical pulley pairs.

With the link chain proposed here, increased security against losing a rocker pressure piece and / or a link plate can be achieved. At the same time, the link chain or a pair of link plates of the link chain can be installed (secured) in a simple manner and preferably with little thermal influence on the material of the rocker pressure piece. The link chain proposed here can be used as a replacement for a conventional link chain without additional measures.

• - ein erstes Kegelscheibenpaar mit einer ersten Rotationsachse und mit einem veränderbaren axialen ersten Scheibenabstand;
• - ein zweites Kegelscheibenpaar einer zweiten Rotationsachse mit einem veränderbaren axialen zweiten Scheibenabstand; und
• - eine Laschenkette nach einer Ausführungsform gemäß der obigen Beschreibung, wobei die beiden Kegelscheibenpaare mittels der Laschenkette, welche als in den Kegelscheibenpaaren axial eingepresstes Zugmittel angeordnet ist, mit einem Übersetzungsverhältnis, welches von den eingestellten Scheibenabständen abhängig ist, drehmomentübertragend miteinander verbunden sind,

wobei das Übersetzungsverhältnis zwischen den Kegelscheibenpaaren bevorzugt stufenlos veränderbar ist.According to a further aspect, a belt transmission for a drive train is proposed, having at least the following components:

• - A first pair of conical disks with a first axis of rotation and with a variable axial first disk spacing;
• - A second pair of conical disks of a second axis of rotation with a variable axial second disk spacing; and
• A plate-link chain according to an embodiment according to the above description, the two pairs of conical pulleys being connected to each other in a torque-transmitting manner by means of the plate-link chain, which is arranged as traction means axially pressed into the pairs of conical pulleys, with a transmission ratio that is dependent on the set pulley spacings,

wherein the transmission ratio between the conical pulley pairs is preferably continuously variable.

The belt drive is set up for a drive train, for example a motor vehicle, and comprises at least one first pair of conical disks arranged on a first transmission shaft, for example the transmission input shaft, and a second conical disk pair arranged on a second transmission shaft, for example the transmission output shaft, as well as one for torque transmission between the conical disk pairs provided looping means, namely the link chain described above. A pair of conical disks each comprises two conical disks, which are aligned with corresponding (conical) surfaces and can be moved axially relative to one another. In a preferred embodiment, the (first) conical disk, then referred to as a loose disk or movable disk, is displaceable (axially displaceable) along its axis of rotation and the other (second) conical disk, then referred to as a fixed disk, is fixed (axially fixed) in the direction of the axis of rotation. This allows the respective spacing of the respective conical pulley pair to be changed.

When the belt drive is in operation, the link chain is moved between an outer position (small or minimum effective circle) and an inner position (large or maximum effective circle) in a (based on) due to the (conical) surfaces of the two conical disks by means of a relative axial movement of the conical disks of a conical disk pair the respective axis of rotation) shifted in the radial direction. The link chain thus runs on a variable effective circle, i.e. with a variable running radius. This means that there is a different speed ratio and torque ratio of one Conical pulley pair on the other conical pulley pair, preferably continuously adjustable.

The belt drive proposed here has a link chain as described above, the rocker pressure pieces of the link chain ensuring a high level of operational reliability with respect to axial forces (shear forces). This operational reliability is achieved as a result of the great length of the rod element and / or the large proportion of the contact surface between the axial securing element and the tab-side contact surface as a result of the transverse arrangement, preferably parallel to the axial direction. The loss of a rocker pressure piece and / or a link plate of the link chain is excluded if the system is used as intended. At the same time, in a suitable embodiment of the rocker pressure pieces, no additional installation space is required. The belt drive can be used as a replacement for a conventional belt drive without any modifications.

• - zumindest eine Antriebsmaschine;
• - zumindest einen Verbraucher; und
• - ein Umschlingungsgetriebe nach einer Ausführungsform gemäß der obigen Beschreibung,

wobei die zumindest eine Antriebsmaschine zur Drehmomentübertragung mittels des Umschlingungsgetriebes mit dem zumindest einen Verbraucher mit veränderbarer Übersetzung verbunden ist.According to a further aspect, a drive train is proposed having at least the following components:

• - at least one prime mover;
• - at least one consumer; and
• - a belt drive according to an embodiment according to the description above,

wherein the at least one drive machine for torque transmission by means of the belt drive is connected to the at least one consumer with a variable ratio.

The drive train, for example of a motor vehicle used to propel it via at least one propulsion wheel (consumer), is set up to receive one of one or a plurality of drive machines, for example an internal combustion engine and / or an electrical machine, and via its respective drive shaft, for example that is, the combustion shaft and / or the rotor shaft, to transmit torque output for use by a consumer as required, that is, taking into account the required speed and the required torque. One use is, for example, an electrical generator to provide electrical energy or the transmission of torque to a propulsion wheel of a motor vehicle for propulsion.

In order to transmit the torque with different gear ratios, the use of the belt drive described above is particularly advantageous because the link chain enables a very high degree of torque transmission efficiency. The link chain proposed here also has a particularly high level of failure safety with a high transmittable torque, because the loss of a rocker pressure piece and / or a link is excluded in the operation of the belt drive according to the design. At the same time, in a suitable embodiment of the rocker pressure pieces, no additional installation space is required.

• 1: Wiegedruckstück mit verkürztem Axialsicherungselement in einer Seitenansicht;
• 2: Wiegedruckstück mit verkürztem Axialsicherungselement in einer perspektivischen Ansicht;
• 3: Wiegedruckstück mit Axialsicherungselement in einer Seitenansicht;
• 4: Wiegedruckstück mit Axialsicherungselement in einer perspektivischen Darstellung;
• 5: Wiegedruckstück mit Axialsicherungselement mittels Kontaktschweißen; und
• 6: ein Umschlingungsgetriebe in einem Antriebsstrang.

The invention described above is explained in detail below against the relevant technical background with reference to the accompanying drawings, which show preferred embodiments. The invention is in no way restricted by the purely schematic drawings, it being noted that the drawings are not dimensionally accurate and are not suitable for defining size relationships. It is shown in

• 1 : Rocker pressure piece with shortened axial securing element in a side view;
• 2 : Rocker pressure piece with shortened axial securing element in a perspective view;
• 3rd : Rocker pressure piece with axial securing element in a side view;
• 4th : Rocker pressure piece with axial securing element in a perspective view;
• 5 : Cradle pressure piece with axial securing element by means of contact welding; and
• 6th : a belt drive in a drive train.

In 1 is a (front) rocker pressure piece 1 and a (rear) rocker pressure piece 2 of a rocker pressure piece pair 3rd with a (here short) axial locking element 16 shown in a side view, so that the view of one of the two end faces 31 is directed. The frontal area 31 is for the force-transmitting, preferably frictional, contact with the conical pulleys of the conical pulley pairs 23 , 24 set up. The rear rocker pressure piece 2 is shown here only with dashed lines and is not explained further. In a preferred embodiment, the description of the front rocker pressure piece applies 1 for the rear rocker pressure piece 2 . Only for the sake of clarity and without excluding the general public is the rear rocker pressure piece 2 (mirrored) identical to the front rocker pressure piece 1 shown. The radial direction 7th runs from bottom to top, as shown, the chain running direction 8th from left to right and the axial direction 6th into the image plane. The dimensions of the rocker pressure piece 1 are as height extension 9 (in radial direction 7th ), Width extension 10 (in the direction of travel of the chain 8th ) and elongation 5 (in the axial direction 6th , compare 2 ) Are defined. The (front) Cradle pressure piece 1 has a rolling surface 15th on which in use in a link chain 4th (compare 6th ) in the rocker pressure piece pair 3rd a force-transmitting contact with the (rear) rocker pressure piece 2 forms. The (front) rocker pressure piece 1 points in the direction of travel of the chain 8th the rolling surface 15th opposite a tab-side contact surface 11 on which an outer contour to be recognized as a visible edge in this side view 12th having. The outer contour 12th is here, for the sake of simplicity, as constant over the length extension 5 shown. This is a preferred embodiment of the rocker pressure piece for cost-effective production 1 . The outer contour 12th has an arcuate course, with a radial component (as indicated here by way of example) 18th extending approximately in the radial direction 7th is included. On the contact surface on the tab side 11 is the axial locking element 16 attached, which is attached to the outer contour 12th of the rocker pressure piece 1 clings to a full-surface connection with (the section corresponding to the rod length) of the tab-side contact surface 11 to build. The axial locking element 16 has an extension in the direction of the rod 17th on, which is preferably parallel to the chain running direction 8th runs, so in a plane which is to that of the radial direction 7th and the direction of travel of the chain 8th Plane is aligned parallel. In the embodiment shown, the axial securing element is 16 for example welded, for example by means of contact welding. In 3rd to 5 are further embodiments of the rocker pressure piece 1 shown, with possible variants of axial securing elements 16 or their fastening methods are shown. The preceding general description also applies to the embodiments shown there.

In 2 is the (front) rocker pressure piece 1 according to 1 shown in a perspective view and reference is made to the corresponding description. The axial direction 6th and the length extension (shown in section according to the detail) 5 runs perpendicular to the radial direction 7th and the direction of travel of the chain 8th obliquely into the image plane. The rod shape of the axial locking element 16 can be clearly seen here, the rounded outer surface being purely optional and independent of the embodiment shown.

In 3rd is a (front) rocker pressure piece 1 with an axial locking element 16 shown in a side view. Compared to 1 and 2 has the axial locking element 16 an extension in the direction of the rod 17th on, which extends over almost the entire lug-side, for example over more than 80% of the contact surface 11 extends and thus along the rod direction 17th radially outside and radially inside over the area of the radial component 18th extends beyond. The axial locking element 16 hugs the outer contour over the entire surface 12th of the rocker pressure piece 1 at. In the embodiment shown, the axial securing element is 16 for example by means of shrink-fitting with the contact surface on the tab side 11 connected, for example by the axial securing element 16 is heated and / or the body of the rocker pressure piece 1 is undercooled and then the axial locking element 16 on the tab-side contact surface 11 is mounted.

In 4th is the rocker pressure piece 1 with axial locking element 16 , for example according to 3rd , shown in a perspective view. Here, too, is the rod shape of the axial securing element 16 easy to see, the angular outer surface, that is to say the rectangular cross-section, being purely optional and independent of the embodiment shown.

In 5 is the (front) rocker pressure piece 1 with an axial locking element 16 in a side view similar to the embodiment according to 3rd and 4th shown in a fastening process step. It is proposed here that the axial securing element 16 by means of spot welding with the contact surface on the bracket side 11 connected is. Here is the first (top as shown in the illustration) electrode 32 (optional) the anode and the second (lower, as shown) electrode 33 (accordingly optional) the cathode.

In 6th is a belt drive 21 in a perspective view in a section of a drive train 22nd shown in which a plate link chain 4th as a traction device on two pairs of conical pulleys 23 , 24 expires. The plate chain 4th has a chain width in the axial direction 6th (parallel to the axis of rotation) on which of the longitudinal extension 5 of the rocker pressure piece pairs 3rd corresponds to. This results in a defined distance between the panes 27 , 28 to a resulting effective circle on the respective conical pulley pair 23 , 24 . In this case the first is slice spacing 27 large and thus the first effective circle small and the second disc spacing 28 small and thus the second effective circle large. This is by means of the belt drive 21 from a first gear shaft 34 , for example a transmission input shaft, with a first axis of rotation 25th , to a second gear shaft 35 , for example a transmission output shaft, with a second axis of rotation 26th a torque ratio greater than 1, for example 2, is set.

The tabs 13th , 14th are by means of the plurality of rocker pressure piece pairs 3rd with each other (for the transmission of tensile force in the dreams 36 , 37 ) chained together to form a ring. There are a plurality of tabs 13th , 14th in the axial direction 6th arranged side by side. Here is a coordinate system in the first strand 36 shown, which corresponds to the coordinate system according to the previous figures. The direction of travel of the chain 8th lies in the plane of the ring of the link chain 4th . The axial direction 6th (corresponds to the direction of the chain width) is parallel to the axes of rotation 25th , 26th aligned. The radial direction 7th points to the outside of the link chain 4th formed ring. The position of the coordinate system shown is at any point on the link chain 4th and the alignment of the chain running direction 8th and the radial direction 7th as well as the position of the axial direction 6th change with the movement of the link chain 4th .

For example, is on the first gear shaft 34 a prime mover 29 connected, only the torque-absorbing input gear is shown here. For example, is on the second gear shaft 35 a consumer 30th , for example at least one drive wheel for a motor vehicle, connected, only the torque-emitting output gear is shown here.

With the rocker pressure piece proposed here, a high shear strength of the axial securing element and thus a high level of security against losing a rocker pressure piece or a tab is created with simple means.

List of reference symbols

1

front rocker pressure piece

2

rear rocker pressure piece

3

Cradle pressure piece pair

4th

Plate chain

5

Elongation

6th

Axial direction

7th

Radial direction

8th

Chain running direction

9

Height extension

10

Extension of width

11

lug-side contact surface

12th

Outer contour

13th

front flap

14th

rear flap

15th

Rolling surface

16

Axial locking element

17th

Bar direction

18th

Radial part

19th

radial outer welding point

20th

radial inner welding point

21

Belt drive

22nd

Powertrain

23

first pair of conical disks

24

second pair of conical disks

25th

first axis of rotation

26th

second axis of rotation

27

first disc spacing

28

second disc spacing

29

Prime mover

30th

consumer

31

Face

32

first electrode

33

second electrode

34

first gear shaft

35

second gear shaft

36

first dream

37

second dream

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 10017005 A1 [0002]

Claims (8)

Rocker pressure piece (1,2) for a rocker pressure piece pair (3) of a link chain (4), comprising: - a length extension (5) which is aligned in the axial direction (6) in use in a link chain (4); - A vertical extension (9) which, in use in a link chain (4), is aligned in the radial direction (7); - A width extension (10) which, in use in a link chain (4), is aligned in the chain running direction (8); - A plate-side contact surface (11) with an outer contour (12) for contact with a plate (13, 14) in use in a plate-link chain (4); and - a rolling surface (15) for contact with a further rocker pressure piece (2,1) in use in a rocker pressure piece pair (3), - an axial securing element (16) attached to the rocker pressure piece (1,2) for securing the rocker pressure piece (1,2 ) when used in a link chain (4), characterized in that the axial securing element (16) is designed as a rod element with a longest extension in the direction of the rod (17), the rod element in the direction of the rod (17) over the entire surface with the outer contour (12) of the rocker pressure piece (1,2) is in contact. Cradle pressure piece (1,2) Claim 1 , wherein the axial securing element (16) is aligned parallel to the tab (13, 14). Cradle pressure piece (1,2) Claim 1 or 2 , wherein the axial securing element (16) extends in the rod direction (17) over a large part of the tab-side contact surface (11), preferably over at least 80%, particularly preferably over the entire radially extending radial portion (18), of the tab-side contact surface (11). Cradle pressure piece (1,2) according to one of the preceding claims, wherein the axial securing element (16) is connected to the rocker pressure piece (1,2) by means of at least one of the following joining methods: - fusion welding; - contact welding; - Spot welding, preferably by means of only one radially outer welding point (19) and one radially inner welding point (20); and - Shrinking on, the axial securing element (16) preferably being heated prior to assembly. Cradle pressure piece pair (3) for a link chain (4) one Belt transmission (21), having two rocker pressure pieces (1,2), of which at least one is designed according to one of the preceding claims, wherein preferably the rocker pressure pieces (1,2) of the rocker pressure piece pair (3) are identical. Link chain (4) for a belt drive (21) of a drive train (22), having at least the following components: a plurality of link plates (13, 14); and - a corresponding number of rocker pressure piece pairs (3), at least one rocker pressure piece pair (3), preferably exclusively rocker pressure piece pairs (3), according to Claim 5 is included, wherein by means of the link chain (4) a torque between a first pair of conical pulleys (23) and a second pair of conical pulleys (24) can be transmitted frictionally, a transmission ratio between the pairs of conical pulleys (23,24) is preferably continuously variable. Belt drive (21) for a drive train (22), having at least the following components: - a first pair of conical pulleys (23) with a first axis of rotation (25) and with a variable axial first pulley spacing (27); - A second pair of conical disks (24) of a second axis of rotation (26) with a variable axial second disk spacing (28); and - a link chain (4) after Claim 6 , wherein the two pairs of conical pulleys (23,24) by means of the link chain (4), which is arranged as traction means axially pressed into the pairs of conical pulleys (23,24), with a transmission ratio which is dependent on the set pulley spacings (27,28), Are connected to one another in a torque-transmitting manner, the transmission ratio between the conical pulley pairs (23, 24) preferably being continuously variable. Drive train (22) having at least the following components: - at least one drive machine (29); - At least one consumer (30); and - a belt drive (21) after Claim 7 , wherein the at least one drive machine (29) for torque transmission by means of the belt transmission (21) is connected to the at least one consumer (30) with a variable translation.

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