EP3574233A1

EP3574233A1 - Transmission component

Info

Publication number: EP3574233A1
Application number: EP17816780.5A
Authority: EP
Inventors: Tim Fiss; Philipp Freiheit
Original assignee: ContiTech Antriebssysteme GmbH
Current assignee: ContiTech Antriebssysteme GmbH
Priority date: 2017-01-24
Filing date: 2017-12-14
Publication date: 2019-12-04
Also published as: WO2018137844A1; DE102017201075B4; DE102017201075A1

Abstract

Transmission component between at least one driveshaft and an output shaft within a drive train, the transmission component comprising at least one transmission stage with a transmission ratio between the driveshaft and the output shaft and having at least one transmission wheel which is connected to a driveshaft and one transmission wheel which is connected to an output shaft. Each transmission stage is configured as a traction belt drive with a fixed transmission ratio and is arranged within a housing which closes off the transmission components separately. The transmission wheels are configured as pulley wheels of the traction belt drive and are mounted in the housing, and the traction belt drive has at least one traction belt which wraps around the pulley wheels in a frictionally locking and/or positively locking manner in order to transmit a torque and a rotational speed. The driveshafts and output shafts can be connected through housing openings to the respective transmission wheels which are situated within the housing for conjoint rotation.

Description

Description Transmission component

The invention relates to a modular designed transmission component between at least one drive and an output shaft within a drive train, wherein the transmission component comprises at least one gear stage with a transmission ratio between input and output shafts and at least one connected to a drive shaft gear and a driven shaft connected to a gear ,

The drive shaft or the associated drive gear and the output shaft, including output gear are, as usual in a transmission, with respect to their

Rotational motions and torques kinetically coupled with each other. In gear wheels in the form of gears, this is done by meshing gears, possibly via other intermediate wheels. In this case, a gear ratio is formed, which u.a. calculated by the ratio of the angular velocities or speeds of drive wheel and driven wheel. Transmissions thus serve to transmit mechanical power, whereby a change of torque or speed and angular velocity between drive and output arises, unless the gear ratio is 1.

Often gear transmissions are used, whose gear wheels have either serrations, bevel or bevel gears or, rarely, also helical gears. The gears mesh with each other, so that the transmission ratio of the transmission or individual gear stages can also be determined by the ratio of the diameter or the number of teeth. As gear stage or gear ratio in a gear train is called a compilation of two gears fixed translation, so a single-stage gearbox. Due to the design geared at a gear according to the transmitted forces and moments tooth module but also the center distance of the respective gear ratios by gear ratio or the respective diameter of the gears is limited in gear transmissions. The bridging of larger center distances than through

Gear module and translation fixed distances can then be done only on other gear stages that do not necessarily serve the actual translation, but only increase the size of the transmission. In real gearboxes resulting from each additional gear stage efficiency losses and an increase in the masses. In addition, then increased lubrication by oils and greases may be required for the operation of the transmission.

In addition, each meshing, so the meshing of the gears produces vibrations and thus noise. These noise emissions can through

helical gears are minimized, but can not be completely avoided.

In addition to the gear drives mentioned, forces and torques can also be transmitted by means of belt drives from a drive shaft to an output shaft. These belt drives have at least two pulleys, which are frictionally and / or positively wrapped by a drive belt over part of its circumference. As drive belts or pull belts, here e.g. Flat belts, V-belts, V-ribbed belts or toothed belts made of elastomeric materials are used.

Belt drives have the advantage that here almost any desired center distances can be set and that due to the lower mass lighter transmissions are possible. Disadvantageously, belt drives can heat up strongly and are e.g. due to their frictional connection or their belt material in view of

Power transmission limited to gear transmissions. For this purpose, special material mixtures, fabric coatings and reinforcing elements in the tension belt are often required. In practice, there is often a desire to take advantage of both types of transmissions

to be able to react relatively flexibly in terms of design and, at the same time, to achieve a high degree of stability in terms of axle spacings between drive and output

Efficiency without additional gear stages to achieve. Also, the use of lubricants should be minimized for environmental reasons alone. The same applies to a weight saving, so that transmissions for work machines are easier.

For the invention therefore had the task of providing a transmission component, which is quasi used as a substitute for a gear stage of a gear transmission, in relation to the bridged center distance between the drive and output variable and constructive adaptable, which requires little or no lubricants in

weight-optimized construction produced and is unproblematic in terms of noise. In addition, a reduction in CC emissions was sought, as it is achievable, for example, that the efficiency is increased, while at least the efficiency of individual gear stages within a larger transmission.

This object is achieved by the features of the main claim. Further advantageous embodiments are disclosed in the subclaims.

In this case, each gear stage is designed as Zugriomentrieb with a fixed gear ratio and arranged within a separate the transmission component and enclosing housing, the gears are formed as pulleys of the Zugriestriebs and stored in the housing and the Zugrieb drive has at least one pull belt, the friction and the pulleys /or

positively engages the transmission of torque and a speed, wherein the drive and output shafts rotatably connected by housing openings with the respective gear wheels located within the housing, so the drive or driven gear are connected. This results in a transmission component, which in the form of a modular transmission cassette in the drive train or in existing gear arrangements or gear structures separately or in combination with other gearboxes /

Transmission components is used. The term "gear cassette" is here used true to the actual meaning of the word as a "small box" (cassette), wherein such a unit, i. a cassette, an elementary, relatively simple "basic function" of a transmission includes and variable with other gear cassette or other

Transmission types can be assembled into an overall system. For example, a gear stage in a gear transmission as about

Countershaft or serves as a downstream reduction, be readily replaced by the transmission component according to the invention. Thus, e.g. to dispense with a lubrication of this gear stage, the installation of the gear cassette leads in total to a weight savings compared to conventional gear solutions and by increasing the efficiency and reducing the weight can vary depending on

Operating environment at the same time the possibly resulting C02 emissions of the driven

Object can be reduced. Furthermore, the noise emitted by the transmission is reduced. The housing of the component or the gear cassette is advantageously designed so that it can be used modularly, ie that it can be added as a transmission component existing devices or constructions, possibly also in duplicate or multiple execution, or can be put together in a multiple arrangement as a transmission system , The housing is namely modular as

Gear cassette is designed so that it can be connected to other transmissions of the same type or existing transmission components in the drive train to a transmission and assembled. This is preferably achieved via congruently arranged bores, connecting elements or housing openings. The translation in the transmission component or the gear cassette is realized according to the invention via a belt drive / belt drive. The gear ratio results from the ratio of the diameter of drive and driven pulley in the housing. The transmission of the speeds and torques via an elastomer or

Polyurethane-based belting agent. This can be both a toothed belt, as well as a V-belt or a V-ribbed belt. The length of the belt may vary depending on the installation situation for bridging different center distances. The damping properties of the material allow load peaks to be compensated for, dampening vibrations and noise.

An advantageous development consists in that inside the housing a tensioning device for the tensioning strap provided for the gear stage located therein is provided, preferably a load-dependent tensioning device. Thus, the voltage required for a train of tension within the gear cassette is realized and does not need to be set in a special way before using the transmission component. The gear cassette is thus directly usable without further preparatory work or adjustments.

A further advantageous embodiment is that a load-dependent

Clamping device is provided for the tension belt, in which a pivotally mounted first tensioning pulley are assigned to the load strand and a second pivotally mounted tensioner idler pulley, wherein the tensioning rollers each pivotable via a hinged to the tensioning rollers and mounted in the housing pendulum support and connecting the pendulum supports coupling drive are connected to each other so that by rolling under drive load pivoting on the Lasttrum first tension roller rolling on the slack side second clamping roll is pivotally and undeliverable in terms of increasing the belt tension the empty strand. In particular, when advantageously the tension rollers are designed as back rollers, results in a clamping device which requires very little space and can be arranged in the same plane of Zugriementriebes. A retightening is therefore not required, since the belt drive is automatically subjected to the belt drive of a tension that is sufficiently dimensioned for the transmission of torque. Similar load-dependent tensioning devices are disclosed, for example, in DE 10 2010 060703 AI and DE 10 2010 060705 AI, which is incorporated herein by reference.

A further advantageous embodiment is that a plurality of transmission components can be coupled and connected to one another on a common through shaft. This can be done in mechanical series connection or parallel connection, wherein in the

Parallel connection, for example, the transmitting torque to several

Transmission cassettes can be divided with Zugriemenrieben, so that a lighter construction of the individual cassettes or the transmission of a much higher

Torque is possible.

A further advantageous embodiment is that the gear wheels designed as pulleys are mounted on both sides in the housing. This creates a smooth and concentric run of the pulleys and avoids the application of bending moments to the pulley bearings. This will be the

Increased life of the gear cassette.

A further advantageous embodiment is that the gear wheels designed as pulleys on one or both sides with drive and driven shafts are connected, preferably via a provided in the hub of the pulley keyway for receiving a corresponding keyway. With such a construction, for example, you can reduce the size or a simple

Reach adjacent construction. In such pulleys, which are mounted on both sides in a housing and have a keyway in their hub for receiving a corresponding keyway, the connection to the drive shaft and output shaft can be structurally very simple. Access to the input and output shafts can be on both sides of the

Housing done. Thus, the transmission input can be either opposite or on the same side of the transmission output. Furthermore, over a

Through shaft several of the gear stages are coupled to each other to realize different transmission ratios in several stages. The housing of the transmission component advantageously has different holes for supporting the moving parts in the interior and for fixing at the later installation site. A further advantageous embodiment is that the housing has ventilation openings, grids or slots. This allows effective cooling of the

Riementriebe reach, especially if there is a risk of slippage. Overheating of the belt drive will safely avoid As already shown above, there is a further advantageous embodiment is that pull belt is designed as a toothed belt, V-belt or V-ribbed belt. These types of belts are each well suited for special applications and for the transmission of special forces or high speeds. Of course you can also combine several transmission cassettes with different pull straps. Optionally, the gear stages can be operated with different drive belts. Thus, a V-ribbed belt can contribute to acoustic optimization at high speeds and low torques, while a toothed belt is used in the gear stage, in which particularly high torques are transmitted. The invention solves the problem of bridging long center distances, without reducing the efficiency of the transmission by superfluous gear stages

It is particularly advantageous to use the transmission component according to the invention, if several of these components for a transmission in the drive train of a work machine, a tractor or a motor vehicle, in particular countershaft, are assembled.

Further areas of application arise, for example, in the large field of electromobility, for example, for transmission for the reduction of the electric motor to the differential of a vehicle drive, for so-called "mild hybrid" - drives in the coupling of a Electric motor with an internal combustion engine, as well as for industrial applications on eg machine tools or compressors.

The transmission component according to the invention in the form of a gear cassette enables simple scalability of the gear ratio by coupling a plurality of gear stages via passage shafts and thus a variable installation situation; a double-sided drive and down it easily possible.

Reference to an embodiment of the invention will be explained in more detail. Show it

Fig. 1 shows an inventive transmission component in perspective

Presentation,

Fig. 2 is an overall view of a compilation of several than

Gear cassette trained transmission components acc. Fig. 1,

Fig. 3 shows the interior of another embodiment of the invention

Transmission component in perspective view.

FIG. 1 shows a perspective view of a gear cassette la - lc

trained inventive transmission component 1, in which a cover of the housing is opened. 2 shows an overall view of the gear cassettes la-lc from the outside.

The transmission component 1 is arranged here between a drive shaft and an output shaft within a drive train, wherein the waves as such the

For clarity, not shown here. The drive shaft is received in the hub 2 of the transmission wheel 3 provided as a drive wheel, namely via a provided in the hub 2 keyway for receiving a corresponding keyway. The output shaft is received in just this way in the hub 2 'of the driven gear 4 provided as a driven wheel. As a result, the shafts are rotatably connected by housing openings 27 with the respective gear wheels 3 and 4 located within the housing. The transmission component shown here comprises a gear stage with a structurally defined transmission ratio of i = d ₂ / dl dAbtriebsscheibe / dAntriebsscheibe 2.2 between drive and output shaft.

The gear stage realized within this transmission component 1 is designed as a tension belt drive and arranged within a housing 5 enclosing the transmission component 1 separately. The housing consists of the lower housing part 5 a and the housing cover 5 b, not shown here, but which can be seen in the synopsis with the figure 2.

The gears 3 and 4 are formed as pulleys of Zugriestriebs and stored on their hubs and corresponding bearings 6 and 7 in the housing, in this embodiment, both sides in the housing, that is mounted in the two housing components 5A and 5B. The housing 5 has ventilation slots 26 here.

Here, the tension belt drive has a tension belt 8 designed as a V-ribbed belt, which grips the pulleys frictionally in order to transmit torque and speed. The drive pulley 3 rotates in the direction of rotation 9.

Within the housing 5, a tensioning device for the tension belt of the transmission stage located in the housing is provided, namely a load-dependent

Tensioning device. The load-dependent tensioning device for the tensioning belt shown here has a pivotally mounted first tensioning roller 10 on the load strand 11 of the V-ribbed belt 8 and a second tensioning roller 12 mounted in a pivotable manner on the slack side 13. The tension rollers are designed here as back rollers. The tension rollers 10 and 12 are hinged respectively via pendulum supports 14 and 15 and mounted at the end of the inner lever arm of the pendulum supports, wherein the pendulum supports 14 and 15 are in turn mounted in the housing 5 a and 5 b. The pendulum supports 14 and 15 are also connected to each other by a coupling drive or a coupling member 16, namely with their respective outer lever arm on the respective with respect to their housing mounting the tension rollers opposite side.

Given the direction of rotation 9 takes place by the given leverage under drive load pivoting of rolling on the Lasttrum 11 first tension roller 10. This pivots or rotates and the pendulum support 14 to its storage and acts with its outer lever arm via the coupling drive 16 on the outer lever arm of the

Pendulum support 15. The pendulum support 15 then pivots or turns around its own

Storage pivots so that rolling on the slack side 13 second tensioner and then this provides the slack side 13 in the sense of increasing the belt tension.

The housing 5 of the transmission component according to the invention is designed so that it can be connected to other housings or transmission components in the drive train via congruently arranged bores and connecting elements 17 to form a transmission, as shown in FIG. Thus, for example, a plurality of transmission components can be coupled and connected to one another on a common through-shaft. Fig. 3 shows the interior of another embodiment of the invention

Transmission component, namely the Zugrueitrieb there provided tensioning device.

Here, three gears 18, 18a and 19 are formed as pulleys, which are frictionally wrapped by a V-ribbed belt 20. The two

Pulleys 18 and 18a are driving pulleys and connected to drive shafts not shown here. The drive shafts belong to two electric motors, not shown here, which thus transmit their torque at the same speed to the driven pulley 19. The clamping devices 21 and 22 provided here consist in each case of 2 tensioning rollers which are coupled to one another and which are in the marked direction of rotation 23 by the pull transferring forces in the load strand 24 to the opposite idler pulley on the slack side 25 and deliver this tension roller accordingly. It should be noted that according to the two drives within a revolution load and empty strand of the tension belt change each case.

Of course, any other constructions are conceivable, for example one in which, similar to the embodiment shown in FIG. 3, a drive pulley and two driven pulleys are provided.

LIST OF REFERENCE NUMBERS

(Part of the description)

1 gearbox component

2, 2 'hub

3 gear wheel / drive wheel

4 gear wheel / driven gear

5 housing, consisting of housing parts 5a and 5b

6 gear bearing

7 gear bearing

8 tension belts / V-ribbed belts

9 direction of rotation

10 tension roller

11 load space

12 tension roller

13 empty run

14 pendulum support

15 pendulum support

16 coupling drive

17 hole

18, 18a gear, drive pulley

19 Gear wheel, driven pulley

20 V-ribbed belts / tension belts

21 clamping device

22 clamping device

23 direction of rotation

24 load space

25 empty run

26 ventilation slot

27 housing opening

Claims

claims

1. transmission component (1) between at least one drive and one output shaft

within a drive train, wherein the transmission component at least one

Gear stage with a gear ratio between drive and

Has output shaft and at least one connected to a drive shaft gear (3, 18, 18a) and connected to an output shaft gear (4, 19), characterized in that each gear stage designed as Zugriementrieb with a fixed gear ratio and within a the

Transmission component is arranged separately closing housing (5), wherein the

Gear wheels (3, 18, 18a, 4, 19) are formed as pulleys of the Zugriestriebs and stored in the housing and the Zugjeitrieb at least one pull belt (8, 20), the frictional and / or form-fitting to the pulleys

Transmission of a torque and a speed wraps, the drive and output shafts by housing openings (27) rotatably connected to the respective located within the housing gears (3, 18, 18a, 4, 19) are connectable.

2. Transmission component according to claim 1, wherein within the housing (5) is provided for the gear located therein gear stage tensioning device, preferably a load-dependent clamping device (10, 12,14, 15, 16).

3. Transmission component according to claim 2, wherein a load-dependent clamping device for the tension belt (8, 20) is provided, in which a pivotally mounted first

Tension pulley (10) the Lasttrum (11) and a pivotally mounted second tensioner pulley

(12) are associated with the return strand (13), wherein the tensioning rollers (10, 12) in each case via a hinged to the tension rollers and in the housing (5) mounted pendulum support (14, 15) pivotally and via a pendulum supports connecting coupling drive (16) are connected to each other so that by taking place under a drive load

Swiveling the first tensioning roller (10) rolling on the load strand (11), pivoting the second tensioning roller (12) rolling on the idle strand (13), and in the sense of an increase in the belt tension the Leertrum (13) can be fed.

4. Transmission component according to claim 2 or 3, wherein the tension rollers (10, 12) as

Back rollers are formed.

5. Transmission component according to one of claims 1 to 4, wherein the housing so

is formed that it with further housings or transmission components in the

Drive train can be connected to a transmission, preferably via congruently arranged holes, connecting elements or housing openings (17).

6. Transmission component according to claim 5, in which a plurality of transmission components can be coupled to one another and connected to one another on a common through shaft.

7. Transmission component according to one of claims 1 to 6, wherein the pulleys designed as pulleys are mounted on both sides in the housing (5).

8. Transmission component according to one of claims 1 to 7, wherein the gear wheels designed as pulleys one or both sides with input and output shafts are connectable, preferably via a provided in the hub of the pulley keyway for receiving a corresponding keyway.

9. Transmission component according to one of claims 1 to 8, wherein the housing

Ventilation openings, grids or slots (26).

10. Transmission component according to one of claims 1 to 9, wherein the tension belt as

Timing belt, V-belt or V-ribbed belt is formed.

11. Transmission in the drive train of a work machine, a tractor or a motor vehicle, in particular countershaft, composed of one or more transmission components according to claims 1 to 10.