WO2020239160A1

WO2020239160A1 - Plate-link chain having a chain width for a continuously variable transmission

Info

Publication number: WO2020239160A1
Application number: PCT/DE2020/100229
Authority: WO
Inventors: Pascal Fritz; Manuel Falk; Stephan Penner
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2019-05-29
Filing date: 2020-03-23
Publication date: 2020-12-03

Abstract

The invention relates to a plate-link chain (1) having a chain width (2) for a continuously variable transmission (3), comprising at least the following components: - a plurality of plate links (4, 5); and - a corresponding number of rocker pin pairs (6, 7, 8), each comprising a first rocker pin (9) and a second rocker pin (10), having a perpendicular extension in the direction of the chain width (2), wherein, by means of the plurality of plate links (4, 5), the rocker pin pairs (6, 7, 8) are interlinked in a manner transmitting tractive force to form a closed ring and thus define a chain-travel direction (12) pointing in both directions and a radial direction (13) perpendicular to the chain-travel direction (12) and perpendicular to the chain width (2), wherein the radial direction (13) points from inside the ring to outside the ring, and wherein each plate link (4; 5) encloses two rocker pin pairs (6, 7; 7, 8), such that in the chain-travel direction (12) two outer rocker pins (9; 10) and two inner rocker pins (10; 9) are formed in each plate link (4, 5). The plate-link chain is characterized in particular in that at least one of the inner rocker pins (9; 10) is unrestricted radially inwards in the plate links (4, 5) in a chain-travel direction (12) pointing to the inside of the plate link (4, 5). The plate-link chain according to the invention has a particularly long service life and a high degree of efficiency.

Description

Link chain with a chain width for a linkage

The invention relates to a link chain with a chain width for a

Belt drive, a belt drive with such a link chain for a drive train, and a drive train with such a

Belt drive.

From the prior art, plate-link chains are used as a sling for

Belt transmission, for example a so-called CVT [continuous variable transmission], known as traction means. Such a CVT is known, for example, from DE 100 17 005 A1. Such a link chain is for a transmission of high torques and high speeds, such as those from the

Engine construction for motor vehicles are known, set up. Because the gear noises are unusual and are generally perceived as annoying, it is a constant challenge to create a plate-link chain with the lowest possible noise emissions. At the same time, however, there is also a long service life of the plate-link chain, if possible freedom of exchange over the service life of a

Motor vehicle, and aimed at a high level of efficiency. A link chain with rocker pressure pieces is known, for example, from WO 2016/095913 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 FIG

The following description as well as features from the figures can be used, which include additional embodiments of the invention.

The invention relates to a link chain with a chain width for a

Belt drive, having at least the following components: variety of tabs;

a corresponding number of rocker pressure piece pairs, each comprising a first rocker pressure piece and a second rocker pressure piece, with a transverse extension in the direction of the chain width,

wherein the rocker pressure piece pairs by means of the plurality of tabs

are chained to form a closed ring so as to transmit tensile force and thus have a chain running direction pointing on both sides and a radial direction transverse to the

Define the chain running direction and transverse to the chain width, the radial direction pointing from inside the ring to the outside of the ring,

wherein one tab encloses two pairs of rocker pressure pieces, so that two rocker pressure pieces on the outside and two rocker pressure pieces on the inside are formed in one tab in the chain running direction.

The link chain is primarily characterized in that at least one of the rocker pressure pieces on the inside is pointing inside the link plate

Chain running direction is free.

Unless explicitly stated otherwise, ordinal numbers used in the preceding and following description are only used for clear differentiation and do not reflect any order or ranking of the components identified. An ordinal number greater than one does not necessarily mean that another such component must be present.

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 link chain has a chain width and over this chain width a plurality of link plates are adjacent to one another

arranged and form a group of tabs. In use, the chain width is parallel to the alignment of the at least two transmission shafts. Therefore, the direction of the chain width is referred to as axial and is constantly aligned in the same direction during operation. The chain extension is referred to as the chain running direction, which runs in a ring-like manner as described above and in use via the movement of the link chain Orientation changes. The third spatial direction, which is perpendicular to the other two and points outwards from the inside of the closed ring that is formed, is called the radial direction and changes with the running direction of the chain

Alignment. When the chain running direction is mentioned, this does not mean a single direction of rotation as in use, but rather the bilateral course of the tabs and rocker pressure pieces in the closed ring, including the

opposite direction to the direction of rotation in use.

In the chain running direction there are a number of rocker pressure pieces corresponding to the number of plate groups as rocker pressure piece pairs with a rocker pressure piece on the left and a right rocker when viewed from the side (axial plan view)

Rocker pressure piece, where for example the left rocker pressure piece is in direct contact with a plurality of right lugs, and the right one

Rocker pressure piece is in direct contact with a plurality of left tabs and the two rocker pressure pieces of the rocker pressure piece pair are in direct contact with one another. 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 off each other during the movement in a belt drive, thus describing a rocking movement on each other. To accommodate the plurality of plates, the rocker pressure pieces have a corresponding width, which as a rule defines the maximum width of the plate chain, that is to say the chain width. In the case of a CVT, for example, the ends of the rocker pressure pieces are inclined in order to form an approximately parallel contact surface with the surfaces of the conical disk pairs. In the case of a CVT, a torque is introduced into the plate-link chain via the ends of the rocker pressure pieces. The rocker pressure pieces are therefore loaded on both sides with an axial compressive force. The lugs transfer this at least to the currently free, i.e. not axially compressed, rocker pressure pieces (at least of the load area)

Torque as tensile load on the corresponding rocker pressure pieces,

for example, the immediately adjacent rocker pressure piece. The

Rocker pressure pieces or rocker pressure piece pairs are therefore chained to transmit tensile force by means of the large number of tabs.

Brackets have a pair of bracket brackets (radially inside and radially outside) with the main extent or bridging direction in the chain running direction and a pair of side straps with main extension respectively

Bridging direction in the radial direction. The side brackets and tab brackets thus form a frame-shaped component. The tabs described here are the so-called long tabs, which extend into

Differentiate the chain running direction from the so-called short link plates. In most plate link chains, both long link plates and short link plates are provided. In a few applications, only short links or only long links are provided. Both the short tabs and the long tabs each connect two pairs of rocker pressure pieces. The cradle pressure piece pairs are in a link chain with both long link plates and short link plates in the course of the link plate chain

at different distances from one another, namely held by means of the short straps at a shorter distance and held in the by means of the elongated straps

Compare this with a longer distance. The risk of chain kinking, especially with long link plates, is generally considered to be so great that it was previously assumed that cusps are essential for securing or guiding both inner rocker pressure pieces. When considering a single flap, one rocker pin of the two is held

Cradle pressure piece pairs with a side bracket in tensile force-transmitting contact and the other cradle pressure piece, i.e. the rocker pressure piece on the inside (in the chain running direction) is exclusively in tensile force-transmitting contact with the side bracket of the adjacent bracket.

Here it is now proposed that at least one of the link chain

cradle pressure pieces on the inside facing inside the flap

Chain running direction is free. Conventionally, a hump or even (radially continuously extending) web is provided there in order to prevent unintentional displacement of the respective rocker pressure piece pair and chain kinking, in that the hump or web forms a corresponding stop for the inner rocker pressure piece. Here, however, no such securing or guidance is provided by the bracket in question in at least one of the inner rocker pressure pieces on the inner side in the radial direction or on the outer side of the rocker pressure piece in the radial direction. It was found that such a backup or guidance by means of the relevant tab of the

cradle pressure pieces on the inside is not necessary, but the (exclusively) radially outer (if there is no securing on the radially inner side) or the radially inner (if no securing on the radially outer side) securing or guiding by means of appropriate, for example conventional, humps (with extension in the radial direction and effective contact surface in

Chain running direction) of the cradle pressure pieces on the inside is sufficient for safe handling of the link chain before assembly in a belt drive.

This reduces the friction on the rocker pressure pieces, thus extending the service life and increasing the efficiency of the link chain. In addition, as a result of eliminating the notch effect by eliminating the corresponding humps, internal excessive stresses are reduced and thus the strength of the link plate, that is to say the strength of the link plate chain, is increased.

It is also in an advantageous embodiment of the link chain

proposed that at least one of the tabs has at least one positioning lug,

wherein the positioning lug of one of the inside rocker pressure pieces of the

Secures rocker pressure piece pair of one of the adjacent plates in the chain running direction.

In this embodiment, a positioning lug is also preferred as

Extension in the direction of chain travel on the outside edge of a bracket to

to secure the relative position of the rocker pressure piece pairs and the plates and one at least prior to the assembly of the plate chain in a belt drive

To prevent chain kinking.

It should be noted that even an embodiment without positioning tabs is adequately secured against chain kinking if handled properly. In one embodiment, for example, one side (also referred to as a side bracket) of an adjacent plate in the direction of travel of the chain is so wide that this already ensures sufficient positional security when handling the plate chain before assembly or outside the belt drive. For example, it has been observed that in the case of a link chain with long link plates and short link plates in strict alternation, the probability of a chain kinking occurring is low. For link chains with two or more long link plates in an immediate consequence in the chain running direction is the use of at least one

Positioning tabs or at least one tab with positioning tabs is advantageous in terms of avoiding chain kinking.

It is also in an advantageous embodiment of the link chain

proposed that a plurality of plates are arranged adjacent to one another in the width of the chain and preferably less than all adjacent ones

only one of the tabs has the positioning lobes.

The plates are arranged adjacent to one another over the width of the chain and thus form a plate group of plates which is assigned to an immediately adjacent pair of rocker pressure pieces. The tabs are one

Plate group in the axial direction usually not directly adjacent to one another, but alternate, not necessarily regularly, with the plates of the plate group adjacent in the chain running direction.

In the embodiment proposed here, not each of the tabs is provided with a positioning lug, but rather fewer tabs, for example only one tab, for an inner rocker pressure piece of an adjacent tab. This is sufficient to secure against chain kinking. For a uniform strength of the straps, however, it is advantageous for some applications to use the same strap shape as possible for the adjacent straps and thus all adjacent straps or all adjacent straps subjected to higher loads with one

Execute positioning tips.

According to a further aspect, a belt transmission is proposed for a drive train, 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 with a second axis of rotation and with a variable axial second disk spacing; and

a link chain according to one of the preceding claims,

the two pairs of conical pulleys by means of the link chain, which as in

Direction of the chain width axially pressed into a pair of conical pulleys Traction means is arranged, depending on the set pulley distances are connected to each other to transmit torque to transmit torque.

With the belt transmission proposed here, which is also referred to as a belt pulley transmission in the embodiment explained here, a torque can be transmitted from a transmission input shaft to a transmission output shaft, and vice versa, in a step-up or step-down manner, the transmission being continuously adjustable at least in some areas.

The belt drive is for a drive train, for example one

Motor vehicle, set up and comprises at least one first pair of conical pulleys arranged on a first shaft, for example the transmission input shaft, and a second pair of conical disks arranged on a second shaft, for example the transmission output shaft, as well as a belt means provided for torque transmission between the conical pulley pairs, namely the link chain described above. A pair of conical disks includes two

Conical disks, which are aligned with corresponding conical surfaces and are axially movable relative to each other. The first)

Conical disk, also known as loose disk or movable disk, can be displaced along its shaft axis (axially displaceable) and the (second) conical disk, also known as fixed disk, is fixed in the direction of the shaft axis (axially fixed).

In operation of the belt drive, the link chain is due to the

Conical surfaces of the conical disks by means of a relative axial movement of the

Conical pulleys of a pair of conical pulleys between an inner position (small effective circle) and an outer position (large effective circle) in a radial direction (based on the respective shaft axis). The link chain thus runs on a variable effective circle, i.e. with a variable running radius. As a result, a different speed ratio and torque ratio can be set from one pair of conical pulleys to the other pair of conical pulleys, preferably continuously.

The belt drive proposed here has a link chain as described above, the link chain having low internal friction and thus having a high degree of efficiency, while at the same time providing adequate protection against chain kinking. In addition, as a result of eliminating the notch effect by eliminating the corresponding humps, internal excessive stresses are reduced and thus the strength of the link plate, that is to say the strength of the link plate chain, is increased.

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 above description, 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 translation.

The drive train, for example a motor vehicle set up to propel it via at least one drive wheel, is set up to include one of one or a plurality of drive units, for example one

Internal combustion engine and / or an electrical machine, provided and transmitted via its respective drive shaft, for example the combustion engine drive shaft and / or the electric drive shaft (rotor shaft), torque output for use by a consumer as required, i.e. taking into account the required speed and of the required torque. One use is, for example, an electrical generator to provide electrical energy or the transmission of torque to a drive wheel of a motor vehicle to propel it.

To the torque specifically and / or by means of a gearbox with

To transmit different translations, the use of the belt drive described above is particularly advantageous because the link chain enables a very high efficiency of torque transmission and has a long service life. The invention described above is explained in detail below against the relevant technical background with reference to the associated 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: two plates of a plate-link chain with pairs of rocker pressure pieces; and

Fig. 2: a belt drive in a drive train.

In Fig. 1 a small section of a plate link chain 1 is shown in a side view (axial plan view), namely a first plate 4 and a second

Tab 5 (shown on the right), both of which are designed as long tabs. Here is a co-moving coordinate system with the one pointing to both sides

Chain running direction 12, the outwardly pointing radial direction 13 and the

Axial direction 11 shown. The components of the link chain 1 are provided with ordinal numbers here in the order shown from left to right.

A first rocker pressure piece pair 6 is held on the left in the first flap 4 and a second rocker pressure piece pair 7 is held on the right in the second tab 5, the second rocker pressure piece pair 7 and on the right a third rocker pressure piece pair 8 9 and a second rocker pressure piece 10 (pars-pro-toto on the third rocker pressure piece pair 8 identified as a pair). At the first flap 4 forms the (right) second

Rocker pressure piece 10 of the first rocker pressure piece pair 6 the inside

Rocker pressure piece 10 and the (left) first rocker pressure piece 9 of the second

Rocker pressure piece pair 7 the inside rocker pressure piece 9. During

As shown, at the top, that is to say on the outside in the radial direction 13, on the first tab 4, more precisely on the outer tab bracket 24, a respective guide hump 25, 26

is provided is radially inward on the first tab 4, more precisely the inner one

Tab bracket 27, no such hump 28 is provided. On the contrary, the cradle pressure pieces 9, 10 on the inside are free on the inside in the chain running direction 12. The same applies to the second tab 5 in this embodiment. Purely optionally, the second flap 5 has a widened (left) first side, more precisely referred to as (first) side bracket 29 and opposite the second side as (second) side bracket 30. The first side bracket 29 is so far in

Chain running direction 12 is extended so that a positioning lug 14 is formed. The positioning lug 14 acts with a contact surface 31 by contacting the second rocker pressure piece 10 of the first rocker pressure piece pair 6 in the chain running direction 12 to secure this first rocker pressure piece pair 6, i.e. a rocker pressure piece 10 of the (first) link 4 adjacent in the chain running direction 12.

In Fig. 2, a belt transmission 3 is in a perspective view in a

Section of a drive train 15 is shown in which a link chain 1 runs as a traction device on two pairs of conical pulleys 16, 19. The link chain 1 has a chain width 2, so that a defined disk spacing 18, 21 to one

resulting effective circle on the respective conical disk pair 16, 19 leads. This sets a translation by means of the belt transmission 3 from a first shaft 32, for example a transmission input shaft, with a first axis of rotation 17 and a second shaft 33, for example a transmission output shaft, with a second axis of rotation 20.

The tabs 4, 5 (not individually designated here, see FIG. 1 or FIG. 2) are set up with one another for the transmission of tensile force in the strands 34, 35 by means of the large number of rocker pressure pieces 9, 10 arranged in pairs. A chain running direction 12 on both sides (as well as an axial direction 11 and radial direction 13) is defined here at any point on the link chain 1, the spatial orientation of which changes with the movement of the link chain 1. E.g. a drive machine 22 is connected to the first shaft 32, only the torque-absorbing input gear being shown here. E.g. a consumer 23, for example at least one drive wheel, is connected to the second shaft 33, only the torque-emitting output gear being shown here.

The link chain proposed here has a particularly long service life and high efficiency. Reference list link chain 30 second side bracket chain width 31 contact surface belt drive 32 first shaft first bracket 33 second shaft second bracket 34 first strand first wedge pressure piece 35 second strand second rocker pressure piece pair

third cradle pressure piece pair

first rocker pressure piece

second rocker pressure piece

Axial direction

Chain running direction

Radial direction

Positioning lobes

Powertrain

first pair of conical disks

first axis of rotation

first disc spacing

second pair of conical disks

second axis of rotation

second disc spacing

Prime mover

consumer

outer strap bracket

left guide hump

right guide hump

inner strap bracket

hump-free area

first side bracket

Claims

1. Link chain (1) with a chain width (2) for a belt drive (3), having at least the following components:

- A plurality of tabs (4,5); and

- a corresponding number of rocker pressure piece pairs (6,7,8),

each comprising a first rocker pressure piece (9) and a second

Rocker pressure piece (10), with a transverse extension in the direction of the chain width (2), the pairs of rocker pressure pieces (6,7,8) being linked to form a closed ring by means of the large number of tabs (4, 5) transferring tensile force and thus a chain running direction ( 12) and a radial direction (13) transversely to the chain running direction (12) and transversely to the chain width (2), the radial direction (13) pointing from inside the ring to the outside of the ring, and each having a tab (4; 5 ) encloses two pairs of rocker pressure pieces (6,7; 7,8), so that two rocker pressure pieces (9; 10) on the outside and two rocker pressure pieces (10; 9) on the inside are formed in a bracket (4,5) in the chain running direction (12),

characterized in that

at least one of the cradle pressure pieces (9; 10) on the inside is free in the chain running direction (12) pointing inside the bracket (4, 5).

2. plate link chain (1) according to claim 1, wherein at least one of the plates (4)

has at least one positioning lug (14),

wherein the positioning lug (14) of one of the inside rocker pressure pieces (9) of the rocker pressure piece pair (6) of one of the adjacent tabs (5) in

Chain running direction (12) secures.

3. plate link chain (1) according to claim 2, wherein in the chain width (2) a plurality of plates (4) are arranged adjacent to one another and less than all adjacent, preferably exclusively one of the plates (4)

Has positioning lugs (14).

4. Belt drive (3) for a drive train (15), having at least the following components:

- A first pair of conical disks (16) with a first axis of rotation (17) and with a variable axial first disk spacing (18);

- A second pair of conical disks (19) with a second axis of rotation (20) and with a variable axial second disk spacing (21); and

- a link chain (1) according to one of the preceding claims,

the two conical pulley pairs (16,19) by means of the link chain (1), which as in the direction of the chain width (2) in one

Conical pulley pair (16,19) axially pressed-in traction means is arranged, depending on the set pulley distances (18,21) are connected to each other to transmit torque.

5. Drive train (15), comprising at least the following components:

- At least one drive machine (22);

- At least one consumer (23); and

- a belt transmission (3) according to claim 4,

wherein the at least one drive machine (22) for torque transmission by means of the belt drive (3) with the at least one

Consumer (23) is connected to a variable translation.