DE19848324B4 - clutch - Google Patents

Abstract

Gearmotor
comprising a planetary gear driven by an electric motor via a coupling part,
wherein coupling part and sun gear of the planetary gear are positively connected,
characterized in that
the coupling part carries an internal toothing, the motor-side counterpart carries a corresponding external toothing and these internal toothing and external toothing are formed such that a play-free positive connection to the shaft of the electric motor is present
wherein the engine-side counterpart comprises the motor shaft.

Description

The The invention relates to a clutch between a transmission and a Electric motor.

electric motors have as drive one for many technical applications too small torque and too high Rotation speed. Therefore, one often switches between the electric motor and the actual mechanical load a gearbox with which the torque on the output side is increased.

Especially in dynamic applications, such as handling elements of robots, it is necessary to connect the drive train to choose, the capable are, a short-term overload to survive without damage. Furthermore, these compounds are robust and easy to assemble be. In these applications planetary gears are often used.

From the DE 42 41 550 A1 is a planetary gear with coupling for attachment to an electric motor known. There, a complex positive and / or positive coupling is described. The smooth motor shaft is inserted into the coupling and must then with a radial screw 24 be attached.

Strong connections have the disadvantage that under the big contact pressure under loads, especially overloads, Micro motions possible are. For example, the flow of the material in the micro range can not be excluded under these high loads. Even visible positioning inaccuracies are possible.

From the EP 0 339 380 A1 a device for coaxial rotationally fixed connection of a motor shaft with a pinion is known, wherein the pinion is a Einsteckritzel and is inserted into an axial bore of the motor shaft.

From the DE 41 34 552 A1 is a pinion attachment in particular planetary gear known, wherein the pinion has a stub shaft, which is pressed into a part to be bonded, wherein the stub shaft with respect to the part to be bonded has a lower temperature.

From the DE 42 16 400 A1 is a planetary gear in double helical design known in which a drive shaft is designed as a sun gear.

From the DE 44 01 491 A1 is a drive with motor and pinion known to be glued to the drive means with motor shafts.

Of the Invention is based on the object, a coupling between a To train transmission and an electric motor.

The Task is solved according to the features indicated in claim 1.

One important feature of the invention in the geared motor is that one from an electric motor over a coupling part driven planetary gear is included, wherein Coupling and sun gear of the planetary gear are positively connected and wherein the coupling part carries an internal toothing, the engine-side counterpart a corresponding external toothing wears and this internal toothing and external toothing are formed such that a play-free positive connection is present to the shaft of the electric motor, wherein the motor-side counterpart includes the motor shaft.

Especially engages the external teeth of the engine-side counterpart in the internal teeth of the clutch. It is advantageous that a robust, overloadable connection the drive train is shown, which is easy to assemble and is free of play. Another advantage is that micromotion, for example through flowing, and positioning errors can be excluded.

at a further embodiment the transmission is a planetary gear. Advantage is the claim 1 and 2 indicated solution especially in planetary gears, as they often have a high gear ratio and be used because of their little game. In particular the embodiment of the invention advantageous because they have a play-free engine-side drive train having.

at a further embodiment carries the motor shaft an external toothing and thus forms in this way the engine-side counterpart. From Advantage is the compact design, since no other parts are necessary and the teeth of the motor shaft no additional Causes weight.

at a further embodiment becomes a sleeve, the external teeth wearing, applied to the smooth motor shaft without play. The engine side counterpart comprises in this embodiment the smooth motor shaft and the sleeve. The advantage here is that the market Engines can be used and no special order of engines is necessary.

Especially can the sleeve be pinned or glued. The advantage here is the particularly solid and low-backlash connection. In the former case, this connection even especially overloadable.

at a further embodiment the toothing is a splined or involute toothing. The advantage is the freedom from play, overload capacity and low wear, which has a long service life.

at a further embodiment the teeth are crowned. The advantage here is the ease of installation. In particular, fitting the Motor shaft in the clutch is facilitated. In addition will be Also, the centering tolerances, albeit only slightly improved.

1

Shaft seal

2

ball-bearing

3

Sonnenradzapfen

4

sun

5

gearing

6

Getriebebaugehäuse

7

centering

8th

Motor mounting screw

9

motor flange

10

Motor-end counterpart

The The invention will be explained in more detail with reference to a figure.

In the 1 the coupling according to the invention is outlined. The electric motor comes with its motor flange 9 on the gearbox housing 6 with the help of a motor mounting screw 8th attached and with a centering sleeve 7 centered.

The coupling is by means of a ball bearing 2 on the gearbox housing 6 attached. The shaft seal 1 seals the gearbox. On the transmission side, the coupling carries a toothing, which is the sun gear 4 represents a positive connection. The sun gear pin 3 stabilizes the sun wheel 4 and absorbs lateral forces.

The engine-side counterpart 10 is the motor shaft, which has an external toothing 5 carries in the internal teeth 5 the clutch engages.

The Gearing is a splined or involute gearing.

In an embodiment a toothing according to DIN 5480 is taken. It will crown, Flank line corrections and profile corrections, such as foot and ankle surgery and head reductions, chosen so that one simple installation feasible is and at the same time a long service life is reached.

The thus created connection between the engine and clutch is free of play and positive fit.

In another example is on the smooth motor shaft 10 a sleeve 10 attached, which carries the external toothing. The sleeve 10 is with the motor shaft 10 pinned and thus represents a positive and play-free connection.

Claims (8)

Geared motor, comprising a driven by an electric motor via a coupling part planetary gear, coupling part and sun gear of the planetary gear are positively connected, characterized in that the coupling part carries an internal toothing, the motor-side counterpart carries a corresponding external teeth and these internal teeth and external teeth are formed such that a play-free positive connection to the shaft of the electric motor is present, wherein the motor-side counterpart comprises the motor shaft. Geared motor according to one of the preceding claims characterized characterized in that the motor-side counterpart comprises the motor shaft, wherein the motor shaft has an external toothing wearing. Geared motor according to claim 1, characterized that the engine-side counterpart the motor shaft and a sleeve comprising, wherein on the motor shaft, a sleeve is applied, which external teeth wears and connected to the motor shaft without play. Geared motor according to one of the preceding claims, characterized characterized in that the sleeve is pinned with the motor shaft. Geared motor according to one of the preceding claims, characterized characterized in that the sleeve is glued to the motor shaft. Geared motor according to one of the preceding claims, characterized in that the toothing a splined or Involute toothing is. Geared motor according to one of the preceding claims, characterized characterized in that the toothing has a crown. Geared motor according to one of the preceding claims, characterized in that the tolerances of the internal toothing and external toothing so chosen are that the backlash during the Service life of the coupling part guaranteed is.