DE102011013918B4 - Coupling device with a driving and a driven shaft and drive - Google Patents

Abstract

Coupling device with an input and an output shaft (20, 27), the input shaft (20) being connected to a coupling sleeve (3) by means of a key connection, the output shaft (27) being connected to a coupling hub part (1) by means of a key connection, wherein the coupling hub part (1) has an external toothing and the coupling sleeve (3) has an internal toothing, the toothings being in engagement with one another, wherein on the coupling hub part (1) a feather key (2) for the positive connection to the driven shaft (27) in one piece with the External toothing of the coupling hub part (1) is formed, the coupling hub part (1) together with the integrally molded feather key (2) being made of sintered material, i.e. sintered metal, the external toothing also being integrally molded with the feather key (2), the coupling sleeve (3 ) is molded from plastic, the internal teeth with the rest of the coupling sleeve (3) eb is also formed in one piece and is produced by the plastic injection molding process, - the driving shaft (20) having a shaft step as an axial limitation for the coupling sleeve (3), or wherein - the driving shaft (27) having a shaft step as an axial limitation for the coupling hub part (1 ) having.

Description

The invention relates to a coupling device with a driving and a driven shaft and a drive.

It is known that coupling devices couple an input shaft with a driven shaft, whereby deviations from the parallelism of the shafts can be compensated up to a critical value.

From the DE 44 20 822 A1 is a coupling known.

From the US 5 136 780 A a manufacturing process for a camera shaft is known.

From the US Pat. No. 6,478,504 B1 is a hub with integrated feather known.

From the DE 18 13 427 A is known a pulley for an alternator.

From the DE 35 04 322 A1 is known a powder metallurgical bushing for mounting machine elements on a shaft.

From the US Pat. No. 3,530,685 A a gasket for transmission clutches is known.

From the DE 12 09 369 A is a toothed coupling with internally toothed plastic sleeve known.

From the US Pat. No. 1,891,285 A is a shaft coupling known.

The invention is therefore based on the object to form an environmentally friendly drive.

According to the invention the object is achieved in the coupling device with a driving and a driven shaft according to the features specified in claim 1 and in the drive according to the features indicated in claim 12.

• – wobei die eintreibende Welle eine Wellenstufe als axiale Begrenzung für die Kupplungshülse aufweist, insbesondere wobei die Wellenstufe auf der vom Kupplungsnabenteil abgewandten Seite der Kupplungshülse angeordnet ist, und/oder wobei
• – die abtreibende Welle eine Wellenstufe als axiale Begrenzung für das Kupplungsnabenteil aufweist, insbesondere wobei die Wellenstufe auf der von der Kupplungshülse abgewandten Seite des Kupplungsnabenteils angeordnet ist.

Important features of the invention in the coupling device with a driving and a driven shaft are that the driving shaft is connected to a coupling sleeve, in particular by means of feather key connection,
wherein the aborting shaft is connected to a coupling hub part, in particular by means of feather key connection,
wherein the coupling hub part has an outer toothing and the coupling sleeve has an inner toothing, wherein the toothings are in engagement with one another,
wherein a feather key is integrally formed on the coupling hub part for the positive connection with the driven shaft, in particular in one piece with the external toothing of the coupling hub part,
wherein the coupling hub part together with integrally formed feather key is made of sintered material, that is to say sintered metal,
wherein the external toothing is also formed integrally with the key,
wherein the coupling sleeve is formed of plastic, wherein the internal toothing is also integrally formed with the remaining coupling sleeve and is produced by plastic injection molding,

• - Wherein the driving shaft has a shaft step as an axial boundary for the coupling sleeve, in particular wherein the shaft step is arranged on the side remote from the coupling hub side of the coupling sleeve, and / or wherein
• - The aborting shaft has a shaft step as an axial boundary for the coupling hub part, in particular wherein the shaft step is arranged on the side facing away from the coupling sleeve side of the coupling hub part.

The advantage here is that the one-piece design only a few parts are needed and thus the environment is protected. In addition, by the use of sintered material and / or plastic a small clearance of the clutch can be achieved and thus a low noise. Also in this way the environment is spared because the sound emissions are reducible. Furthermore, the reduced game and the reduced rattling due to the lower moments of inertia, the life of the arrangement is renewable and thus in turn reduced resource consumption and the environment spared.

In an advantageous embodiment, the driving shaft has a keyway, in particular an extending in the axial direction of the keyway, in which a feather key is arranged, which has in a corresponding keyway for positive connection with the coupling sleeve. The advantage here is that a simple low-cost and low-play keyway connection can be used, whereby the environment is protected.

In an advantageous embodiment, the driving shaft is non-positively connected to the coupling sleeve, in particular is pressed with a press fit into the coupling sleeve,
in particular, wherein the region covered axially by the non-positive connection comprises or at least partially encompasses the axial region covered by the feather key connection. The advantage here is that the axial play is reduced or even brought to a complete disappearance by means of the frictional connection, in particular compression connection in the region of the feather key connection of the driving shaft with the coupling sleeve. The driving shaft is preferably made of steel. Thus, a well-fitting press connection with a plastic coupling sleeve can be produced in a simple manner.

In an advantageous embodiment, a feather key is integrally formed on the coupling hub portion for positive connection with the driven shaft. The advantage here is that the environment is spared by the reduced number of parts, the game of feather key is reduced and thus the noise is reduced, whereby the environment is again protected by means of the reduced noise emissions.

In an advantageous embodiment, the coupling hub part together with integrally formed key is made of sintered material, in particular of sintered metal,
in particular wherein the external toothing is also formed integrally with the key. The advantage here is that a particularly simple cost-effective and resource-saving production of the coupling hub part is effected. In addition, the moment of inertia is reduced compared to metallic solid material and thus in turn protects the environment.

In an advantageous embodiment, the coupling sleeve is formed of plastic, in particular wherein the internal toothing is also integrally formed with the remaining coupling sleeve, in particular produced in the plastic injection molding process. The advantage here is that a particularly cost-effective and resource-saving production process can be used.

In an advantageous embodiment, a hollow region is arranged around the foot region of the radially inwardly extending integrally formed on the coupling hub part formed around feather, which extends in the radial direction of at least 10% or at least 20% of the radial length of the feather key. The advantage here is that the notch effect and wear on edges of the driven shaft can be reduced.

In an advantageous embodiment, a circlip for axially limiting the Kupplungsnabenteils is provided, in particular in a circumferentially extending groove of the aborting shaft. The advantage here is that an axial fuse can be executed in a simple manner.

In an advantageous embodiment, the driving shaft has a shaft step as an axial boundary for the coupling sleeve, in particular wherein the shaft step is arranged on the side facing away from the coupling hub side of the coupling sleeve. The advantage here is that an axial limitation is made possible in a simple manner.

In an advantageous embodiment, the coupling sleeve is axially delimited on the side facing the driving shaft by a shaft step of the driving shaft and on the other axial side by the coupling hub part,
and or
the coupling hub part is axially bounded on the side facing away from the driving shaft side of a shaft stage of the driven shaft and on the other axial side of the coupling sleeve. The advantage here is that only one shaft stage must be provided on the driving and aborting shaft, and thus both coupling parts, so the coupling hub part and the coupling sleeve, are axially limited.

In an advantageous embodiment, a center hole is arranged on a front side of the driving shaft and / or on an end face of the driven shaft for reducing the moment of inertia. The advantage here is that the mass is reduced and thus the game is reduced. Therefore, the noise and wear is reduced and the service life extended.

Important features in the drive with an aforementioned coupling device are that the driving shaft is a rotor shaft of an electric motor and the driven shaft is connected to the driving gear part of the transmission shaft, in particular pinion shaft,
wherein the driving shaft has a shaft step as the axial boundary of the coupling sleeve, in particular wherein at the shaft stage, the coupling sleeve rests with its axial end region. The advantage here is that a cost-effective axial limitation is achieved.

In an advantageous embodiment, the driving shaft is supported by means of a bearing which is accommodated in a housing part, in particular of the motor. The advantage here is that the coupling device requires no storage of clutch shaft parts.

In an advantageous embodiment, the aborting shaft is supported by means of a bearing, which is accommodated in a housing part, in particular of the transmission. The advantage here is that the coupling device requires no storage of clutch shaft parts.

In an advantageous embodiment, an adapter flange is arranged between the bearing housing housing parts, in particular wherein the housing parts are detachably connected to the adapter flange, in particular by means of connecting screws,
in particular wherein in each case at least one centering means, in particular centering collar, is arranged on the adapter flange and / or on the housing parts receiving the bearing. The advantage here is that two different interfaces are created axially on both sides by means of the adapter, so that different gearboxes are connected to each same engine and different engines to each same gear together. Thus, a high variance in the series with few components can be achieved.

Further advantages emerge from the subclaims. The invention is not limited to the combination of features of the claims. For the skilled person, further meaningful combination possibilities of claims and / or individual claim features and / or features of the description and / or figures, in particular from the task and / or posing by comparison with the prior art task arise.

The invention will now be explained in more detail with reference to schematic illustrations:

In the 1 is a gear coupling according to the invention, comprising a coupling hub part 1 and a coupling sleeve 3 , shown in exploded view.

In the 2 is a cross section through the clutch shown installed between the engine and transmission state. In this case, the motor shaft and the motor flange is shown hatched together, although the motor shaft is rotatably mounted relative to the motor flange and the motor housing.

In the 3 is a cross section through the coupling hub part 1 shown.

In the 4 an associated plan view is shown.

In the 5 is an enlarged section of 4 shown.

The coupling hub part 1 is made of a sintered metal. Thus, it has a low mass and the moment of inertia of the clutch is small, which also reduces the noise, in particular when changing direction, and the dynamics of the clutch is increased.

At the coupling hub part 1 is a feather key 2 integrally formed. Thus, the game is reduced and reduces the noise, especially when changing direction.

The feather key 2 is on the wall of a centrally located recess of the coupling hub part 1 arranged. In this case, the feather key protrudes radially inward, wherein the transition region has such a radially outwardly arranged and so small radius that after insertion of the shaft to be connected by means of the key, which has a corresponding keyway, a cavity 40 it is present at the foot of the section of the coupling hub part projecting into the recess as a keyway area 1 ,

A hollow area 40 remains even after insertion of the aborting shaft 27 , in particular so driving wave 20 of the transmission, in particular pinion shaft, in the coupling hub part 1 exist and thus reduces the contact surface between the driven shaft 27 and the coupling hub part 1 , In addition, the moment of inertia is reduced.

The coupling hub part 1 has an external toothing, which is in engagement with an internal toothing of the coupling sleeve for torque transmission.

The coupling sleeve 3 has a first axial section, the toothed section 6 , on, in which the internal toothing is arranged.

In a second axial section, the connecting section 5 , In turn, a recess is arranged, on whose wall a keyway 4 is arranged.

The driving shaft, in particular motor shaft 20 , Is designed as a solid shaft and has a keyway into which a feather key is inserted into the keyway 4 protrudes.

The coupling sleeve 3 is designed in its internal toothing area with an involute toothing. Accordingly, the external teeth of the coupling hub part 1 is executed crowned.

The abortive wave 27 is a solid shaft and has a keyway into which the feather key 2 is introduced.

At the axial end of the aborting shaft 27 is a center hole 25 arranged. Thus, the moment of inertia is reduced.

The coupling sleeve 3 is axially limited by one on the motor shaft 20 trained wave level 21 , In addition, the motor shaft 20 pressed into the connecting section 5 , This interference fit also causes axial securing in the axial direction away from the motor.

There is also a circlip 24 on the abortive wave 27 arranged for axial limitation of the driven shaft 27 on the coupling hub part 1 ,

The gearbox flange 23 is with the adapter flange 22 by means of connecting screws 26 connected.

The coupling hub part 1 has said external teeth in a first axial section. On the external teeth, the torque is transmitted. The area of the recess of the coupling hub part 1 in which the feather key 2 integrated molded, and the feather key 2 extend axially on both sides beyond the axial Beriech the external teeth. In 3 is this extended receiving section with reference numerals 30 designated. On its outer contour is a radius R2, which reduces the notch effects, mounted between the axial Beriech the external teeth and the axial end portion.

The axial securing of the coupling sleeve 3 is improved by introducing a grub screw, which is preferably radially aligned. The grub screw connects the coupling sleeve 3 and the motor shaft 20 , by itself form-fitting with the coupling sleeve 3 is connected, in particular at least partially disposed in a recess thereof, and establishes a non-positive connection by pressing on the motor shaft.

In an alternative embodiment of the invention is on the grub screw for axial securing and the locking ring 24 to secure the coupling hub part 1 waived. Instead, the coupling part 1 and the coupling sleeve 3 extends axially so that only a very small air gap is provided between them, which is less than 2 mm or less than 1 mm, in particular less than 0.5 mm. Thus, the two parts limit each other axially. Because on the engine side facing the coupling sleeve 3 from the wave level 21 axially limited and on the output side is the coupling hub part 1 limited by a wave level of the local wave. Thus, when the two parts move towards each other, the two face each other, are mutually parallel end surfaces of the parts having the axial direction as their normal direction. As a result, a mutual axial securing of the two coupling parts in both directions is thus achieved in a simple manner and the axial securing by the securing ring can be dispensed with. In an advantageous embodiment, this shortens the overall length, thus saving material and thus protects the environment.

LIST OF REFERENCE NUMBERS

1

Clutch hub portion

2

Key, integrally formed on the coupling hub part 1

3

coupling sleeve

4

keyway

5

toothed section

6

connecting portion

20

motor shaft

21

wave level

22

adapter flange

23

gearbox

24

circlip

25

centering

26

connecting screw

27

abortive wave

30

receiving portion

40

hollow area

Claims (15)

Coupling device with a driving and a driven shaft ( 20 . 27 ), whereby the driving shaft ( 20 ) with a coupling sleeve ( 3 ) is connected by means of feather key connection, wherein the aborting shaft ( 27 ) with a coupling hub part ( 1 ) is connected by keyed connection, wherein the coupling hub part ( 1 ) an outer toothing and the coupling sleeve ( 3 ) has an internal toothing, wherein the toothings are engaged with each other, wherein at the coupling hub part ( 1 ) a feather key ( 2 ) for positive connection with the aborting shaft ( 27 ) in one piece with the external toothing of the coupling hub part ( 1 ) is formed, wherein the coupling hub part ( 1 ) with integrally formed key ( 2 ) made of sintered material, ie sintered metal, is produced, wherein the external toothing also integrally with the feather key ( 2 ) is formed, wherein the coupling sleeve ( 3 ) is formed of plastic, wherein the internal toothing with the remaining coupling sleeve ( 3 ) is also formed in one piece and is produced by plastic injection molding, - wherein the driving shaft ( 20 ) a shaft stage as an axial limit for the coupling sleeve ( 3 ), or wherein - the aborting shaft ( 27 ) a shaft stage as an axial boundary for the coupling hub part ( 1 ) having. Coupling device according to claim 1, characterized in that the driving shaft ( 20 ) a feather keyway ( 4 ), in which a key ( 2 ) is arranged, which in one corresponding keyway ( 4 ) for positive connection with the coupling sleeve ( 3 ) having. Coupling device according to one of the preceding claims, characterized in that the driving shaft ( 20 ) non-positively with the coupling sleeve ( 3 ) connected is. Coupling device according to one of the preceding claims, characterized in that on the coupling part a feather key ( 2 ) for positive connection with the aborting shaft ( 27 ) is integrally formed. Coupling device according to one of the preceding claims, characterized in that around the foot region of the radially inwardly extending, integrated on the coupling hub part ( 1 ) formed key ( 2 ) is arranged around a hollow region, which in the radial direction at least 10% or at least 20% of the radial length of the feather ( 2 ). Coupling device according to one of the preceding claims, characterized in that a retaining ring for the axial limitation of the Kupplungsnabenteils ( 1 ) is provided, Coupling device according to one of the preceding claims, characterized in that for the axial securing of the coupling sleeve ( 3 ) a screw between coupling sleeve ( 3 ) and driving shaft is provided. Coupling device according to one of the preceding claims, characterized in that the coupling sleeve ( 3 ) at the driving shaft ( 20 ) facing side of a wave step of the driving shaft ( 20 ) and on the other axial side of the coupling hub part ( 1 ) is axially limited. Coupling device according to one of the preceding claims, characterized in that the coupling hub part ( 1 ) at the of the driving shaft ( 20 ) facing away from a wave stage of the driven shaft ( 27 ) and on the other axial side of the coupling sleeve ( 3 ) is axially limited. Coupling device according to one of the preceding claims, characterized in that on one end side of the driving shaft ( 20 ) or on an end face of the aborting shaft ( 27 ) a center hole is arranged to reduce the moment of inertia or to reduce the contact surface and thus to reduce the formation of noise when the opposing end faces of the coupling hub part meet ( 1 ) and the coupling sleeve ( 3 ). Drive with a coupling device according to one of the preceding claims, wherein the driving shaft ( 20 ) is a rotor shaft of an electric motor and the driven shaft ( 27 ) is a connected to the driving gear part of the transmission shaft, characterized in that the driving shaft ( 20 ) a shaft stage as the axial boundary of the coupling sleeve ( 3 ) having. Drive according to at least one of the preceding claims, characterized in that the driving shaft ( 20 ) is mounted by means of a bearing which is accommodated in a housing part. Drive according to at least one of the preceding claims, characterized in that the aborting shaft ( 27 ) is mounted by means of a bearing which is accommodated in a housing part. Drive according to at least one of the preceding claims, characterized in that between the bearing housing housing parts, an adapter flange is arranged, wherein the housing parts are detachably connected to the adapter flange by means of connecting screws, Drive according to claim 14, characterized in that at least one centering means is arranged on the adapter flange or on the housing parts receiving the bearing.

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