WO2020228892A1

WO2020228892A1 - Plate link chain having a chain width for a continuously variable transmission

Info

Publication number: WO2020228892A1
Application number: PCT/DE2020/100336
Authority: WO
Inventors: Marius WOHLSCHLEGEL; Manuel Falk
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2019-05-14
Filing date: 2020-04-24
Publication date: 2020-11-19
Also published as: DE102020112410A1

Abstract

The invention relates to a plate link chain (1) having a chain width (2) for a continuously variable transmission (3), said plate link chain comprising at least the following components: - a plurality of link plates (4, 5, 6, 7); and - a corresponding number of thrust pieces (8, 9) with a transverse extension in the direction of the chain width (2). The plate link chain is characterised mainly in that fewer than all of the link plates (5, 7) of at least one of the link plate groups (10, 11) have at least one tip (13, 14) to prevent chain kinking. The plate link chain proposed according to the invention has a particularly long lifespan with a high overall strength of the plate link chain.

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 chain

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 plate-link chain are for transmitting high torques and high speeds, such as those from the

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

Motor vehicle, aimed at. A link chain with rocker pressure pieces is

for example known 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 configurations 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; and

a corresponding number of rocker pressure pieces with a

Transverse extension in the direction of the chain width,

wherein a plurality of the plates are arranged adjacent to one another over the chain width and thus each form a plate group, and

wherein the rocker pressure pieces by means of the plurality of groups of tabs

are chained to transmit tensile force and the rocker pressure pieces and the plurality of plate groups thus define a chain running direction.

The plate-link chain is primarily characterized in that fewer than all of the link plates face at least one of the plate groups with at least one tip

Have chain kinking.

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. They each overlap in

Chain running direction adjacent plate groups so that the plates of a

Tab group not, or at least not all, are directly axially adjacent to one another. The chain width is parallel to the in use

Alignment of the at least two transmission shafts aligned. 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 is as above described runs like a ring and changes its orientation in use via the movement of the link chain. The third spatial direction, which is to the other two

Direction in space is perpendicular, is called the transverse direction and changes its alignment with the direction of the chain.

In the chain running direction there are a number of rocker pressure pieces corresponding to the number of plate groups, in a preferred embodiment designed as rocker pressure piece pairs with a left rocker pressure piece and a right rocker pressure piece when viewed from the side (axial plan view), with the left rocker pressure piece, for example, being in direct contact with a right plate group , the right rocker pressure piece continues to be in direct contact with a left plate group and the two rocker pressure pieces of the

Pairs of rocker pressure pieces 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 as a compressive force to each other and roll in one when moving

Belt gears depend on each other, so describe a rocking movement on each other. To accommodate the tabs (groups), the rocker pressure pieces have a corresponding width, which is usually the maximum width of the

Link chain defined, i.e. the chain width. In the case of a CVT, for example, the ends of the rocker pressure pieces are inclined so as to be approximately parallel

Form the contact surface with the surfaces of the conical pulley 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 transmit the torque as a tensile load to the respective rocker pressure pieces, at least to the currently free, i.e. not axially compressed, rocker pressure pieces (at least on the load side),

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.

It is now proposed here that, in the plate-link chain, at least fewer than all of the plates arranged adjacent to one another over the chain width at least one of the plate groups have at least one tip against chain kinking. The other flaps of this at least one (lobed-reduced) flap group are with at least one tip designed to prevent rotation and / or to protect against overlapping, preferably designed without (a single) tip, that is to say without a tip. In a preferred embodiment, at least one of the plates of the at least one lug-reduced plate group of the link chain is designed without lobes. It was found that it is quite sufficient in operation if not all of the tabs of the lug-reduced group of tabs have such a tip to prevent chain kinking. The tabs that have such a tip or the tips are, for example, conventional. At least one of the embodiments mentioned here preferably applies to all

Plate groups of the plate link chain, with only one

Embodiment of the plate groups is used in the plate chain or several different embodiments of the plate groups in the

Link chain are used.

The conventionally provided anti-rotation tabs and overlapping tabs and the tabs against chain kinking worsen the flow of force in the respective bracket and lead to changes in the expansion behavior, i.e. it occurs depending on

Link type different elongations in the link chain. In this

Two or more tabs are assigned to a tab type if they are of the same length, for example (so-called) short tabs or long tabs, and have the same tips, preferably also have the same geometry, for example the same humps, for receiving and / or securing the rocker pressure piece pairs. It can be due to a different stretch plasticization and

Stretching of the tab types, excessive stresses arise. With the reduced number of tabs which have a tab, at least one tab, for example free from tabs, is thus formed which, for example, has a reduced stretch plasticization and stretching elongation under symmetrical load introduction. In this way, the other (not lug-free) link plates are protected from excessive or at least uneven stretch plasticization and stretch elongation, and the probability of excessive stress in the link plate chain is reduced.

In a preferred embodiment, the at least one other tab is

(preferably all) of the lobes-reduced group of tabs designed without anti-rotation lobes and without overlapping lobes, i.e. free from lobes, and thus achieves a better one Voltage flow. This reduces the stretch plasticization and stretch elongation of this lug-free plate in use and, as a result of avoiding excessive tension, increases the overall strength of the plate chain. In addition, the use of material is reduced, and thus the material costs and the (inert) mass of the link chain. It was found that the noise emission, generally as NVH [noise vibration harshness], of the link chain proposed here remains sufficiently low when used in a belt drive.

It should be pointed out that a link chain often comprises several link types. In some conventional embodiments there is only one

Tab type used. In contrast to this, it is proposed here that at least one of the tabs of the tab groups is at least insofar different from the others

(same) flap types deviates that on this flap there are no tips against

Chain kinking are provided, preferably this tab is formed free of lobes.

In the following, a single (lobed-down) group of tabs is always described. In a preferred embodiment, for example a particularly high increase in the overall strength of the plate link chain, at least one of the suggestions mentioned here, preferably the respective suggestion, is carried out for all plate groups of the plate link chain, so then all

Plate groups of the plate chain with lobe-reduced plate groups.

It is also in an advantageous embodiment of the link chain

proposed that the at least one provided tip of the at least one plate of the plate group secures against chain buckling inwards and / or outwards.

Here it is suggested that such a tip either against a

Chain buckling inwards or outwards or in both directions. In one embodiment, one tab of the group of tabs with a tip against chain kinking inwards is one of the tabs against a tip

Chain kinking to the outside and the remaining tabs of these

Plate groups are designed without such a tip. In one embodiment, there is only a safeguard against chain kinking inwards by means of the tips provided, but no protection against chain kinking to the outside. Merely providing a safeguard against the chain kinking inwards is sufficient for operation. If the plate-link chain is handled properly during transport and when installing the plate-link chain, it is sufficient not to provide any protection against the chain kinking outwards.

It is also in an advantageous embodiment of the link chain

It is proposed that in each of the tab groups only one of the tabs has at least one, preferably exclusively one, tip.

Of the plates arranged adjacent to one another in the width of the chain, that is to say the entire plate group, according to this embodiment only a single plate has at least one tip. In a particularly advantageous one

Embodiment, this tab has only a single tip, preferably only to secure against chain kinking inwards.

It is also in an advantageous embodiment of the link chain

It is proposed that the at least one tab, which has the at least one tip, has this at least one tip exclusively on one side in the chain running direction.

The side of a plate is a front end or a rear end of the respective plate in the chain running direction. These ends with a transverse extension are referred to, for example, as side brackets of the plate, while the two sections with extension in the chain running direction are then referred to as (upper / outer and lower / inner) plate brackets. In this embodiment, such a tab with a small amount of lobes, preferably a single lug on one side, reduces the number of (potential) contacts. Nevertheless, the security against chain kinking (inwards and / or outwards) is retained. This (further) reduces the effect of the different stretch plasticization and stretch elongation of the straps of a group of straps. In addition, the amount of material used, and thus the material costs and the (inert) mass of the

Plate chain. According to a further aspect, a belt drive for a drive train is proposed, having at least the following components: a first pair of conical pulleys with a first axis of rotation and with a variable axial first pulley 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 in each case a conical pulley pair axially pressed-in traction means is arranged, depending on the set pulley spacings are connected to each other 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, translating, constant or reducing, with 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 disk 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 (smaller 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 according to the above description, the link chain having a particularly low effect of different stretching plasticization and stretching elongation, while at the same time providing adequate protection against chain kinking.

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 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 via their respective drive shaft, for example the

Combustion drive shaft and / or the electric drive shaft (rotor shaft) to transmit output torque for use by a consumer as required, i.e. 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 drive wheel of a motor vehicle to propel it. In order to transmit the torque in a targeted manner and / or by means of a gearbox with different ratios, the use of the belt drive described above is particularly advantageous because the link chain has a very high overall strength and a long service life. Overall, a link chain with a lower (inert) mass is for the same torque

or conversely, with a link chain of the same mass, a higher torque can be transmitted than is possible with a conventional link chain.

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: an embodiment of a first group of tabs;

2: an embodiment of a second group of tabs; and

Fig. 3: a belt drive in a drive train.

1 shows a first plate group 10 of a (first) plate link chain 1 (compare FIG. 3), in which, for example, four plates 4, 5, 6, 7 are provided here. For example, the tabs 4, 5, 6, 7 shown are shown in FIG

Sequence from left to right arranged in a group of tabs 10 in the axial direction from front to rear adjacent to one another. The

Tabs 4, 5, 6, 7 are provided with ordinal numbers in the order from left to right. It can be seen here that the second tab 5 and the fourth tab 7 each have lugs 13, 14. The second flap 5 has here exclusively on a single side 15 (marked pars-pro-toto on the second flap 5,

as shown on the right) a single tip 13 against chain buckling inwards. On the other side 16 (pars-pro-toto on the second flap 5

marked, left as shown in the illustration) (here with none of the tabs 4, 5, 6, 7) no tabs are provided. The fourth tab 7 here also has two lugs 13, 14 opposite exclusively on a single side 15 (right in the illustration)

Chain kinking inwards and outwards. The first tab 4 and the third Tabs 6 are formed identically with regard to the stress profiles in the material.

In Fig. 2, a second plate group 11 of a (second) plate chain 1 (see Fig. 3) is shown, which for the sake of clarity is similar to the first

Tab group 10 is designed. In this respect, reference is made to the previous description. It can be seen here that the second tab 5 and the fourth tab 7 each oppose two tabs 13, 14 or one double tab each

Have chain kinking inwards and outwards. The first tab 4 and the third tab 6 are very similar and are formed (almost) identically with regard to the stress profiles in the material. It should be noted that a

Link chain 1 (see FIG. 3) usually has only one type of link group, that is to say the first link group 10 shown is generally not arranged in a common link chain 1 with the second link group 11 shown. It should further be noted that in some embodiments the number of plates in one of the plate groups (types) within a plate chain 1 is different from the number of plates in another of the plate groups (types), for example one of the plate group types (for example

Tab group 10) comprises only two tabs (for example tabs 4, 5) and another type of tab group (for example tab group 11) comprises three tabs (for example tabs 4, 5, 6).

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

Section of a drive train 17 is shown in which a link chain 1 runs as a traction device on two pairs of conical pulleys 18, 21. The link chain 1 has a chain width 2, so that a defined disk spacing 20, 23 to one

resulting effective circle on the respective conical disk pair 18, 21 leads. This sets a translation by means of the belt transmission 3 from a first shaft 26, for example a transmission input shaft, with a first axis of rotation 19 and a second shaft 27, for example a transmission output shaft, with a second axis of rotation 22. The tabs 4, 5, 6, 7 (not individually designated here, compare FIG. 1 or FIG. 2) are set up with one another for the transmission of tensile force in the strands 28, 29 by means of the plurality of rocker pressure pieces 8, 9 arranged in pairs. According to the direction of rotation Conical pulley pairs 18, 21 define a chain running direction 12 (as well as an axial direction 30 and a transverse direction 31), the spatial orientation of which changes with the movement of the link chain 1. For example, a drive machine 24 is connected to the first shaft 26, only that here

torque-absorbing input gear is shown. For example, a consumer 25, for example at least one drive wheel, is connected to the second shaft 27, only the torque-emitting output gear being shown here. The link chain proposed here has a particularly long service life with a high overall strength of the link chain.

Reference list

Link chain 30 Axial direction of chain width 31 Transverse direction of belt drive

first tab

second tab

third tab

fourth tab

left rocker pressure piece

right cradle pressure piece

first group of tabs

second group of tabs

Chain running direction

first corner

second corner

first page

second page

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

first wave

second wave

first dream

second dream

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, 6, 7); and

- A corresponding number of rocker pressure pieces (8,9) with one

Transverse extension in the direction of the chain width (2),

wherein a plurality of the plates (4, 5, 6, 7) are arranged adjacent to one another over the chain width (2) and thus each form a plate group (10,11), and wherein the rocker pressure pieces (8,9) by means of the plurality of

Tab groups (10,11) are chained to transmit tensile force and the

Cradle pressure pieces (8,9) and the plurality of plate groups (10,11) thus define a chain running direction (12),

characterized in that

fewer than all of the tabs (5, 7) have at least one of the tab groups (10, 11) at least one tip (13, 14) against chain kinking.

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

The tip (13,14) of the at least one tab (5,7) of the tab group (10,11) secures against chain kinking inwards and / or outwards.

3. plate link chain (1) according to claim 1 or 2, wherein in each of the plate groups (10, 11) only one of the plates (7) has at least one, preferably only one, tip (13).

4. link chain (1) according to any one of the preceding claims, wherein the

at least one tab (5, 7), which has the at least one tip (13, 14), has this at least one tip (13, 14) exclusively on one side (15) in the chain running direction (12).

5. Belt drive (3) for a drive train (17), having at least the following components:

- A first pair of conical disks (18) with a first axis of rotation (19) and with a variable axial first disk spacing (20);

- A second pair of conical disks (21) with a second axis of rotation (22) and with a variable axial second disk spacing (23); and

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

wherein the two conical pulley pairs (18,21) by means of the link chain (1), which as in the direction of the chain width (2) in one

Conical pulley pair (18,21) axially pressed-in traction means is arranged, depending on the set pulley distances (20,23) are connected to each other to transmit torque.

6. Drive train (17), having at least the following components:

- At least one drive machine (24);

- At least one consumer (25); and

- a belt transmission (3) according to claim 5,

wherein the at least one drive machine (24) for torque transmission by means of the belt drive (3) with the at least one

Consumer (25) is connected to variable translation.