DE102018000231A1 - Shaft assembly with a ring member, a housing part and a rotatably mounted to the housing part shaft - Google Patents

Abstract

Shaft assembly with a ring member, a housing part and a rotatably mounted to the housing part shaft, wherein the ring member is rotatably connected to the housing part, wherein the housing part and the shaft are made of a metallic material, wherein on the ring member an electrically conductive fleece is arranged which contacts the shaft, the nonwoven being electrically connected to the housing part.

Description

The invention relates to a shaft assembly with a ring member, a housing part and a rotatably mounted to the housing part shaft.

It is well known that a shaft can be sealed by means of a shaft sealing ring.

The invention is therefore the object of developing a shaft assembly with a ring member, a housing part and a rotatably mounted to the housing part shaft, with an electrical equipotential bonding is to be achieved.

According to the invention, the object is achieved in the shaft assembly with a ring member, a housing part and a rotatably mounted to the housing part shaft according to the features specified in claim 1.

Important features of the invention in the shaft assembly with a ring member, a housing part and a rotatably mounted to the housing part shaft are that the ring member is rotatably connected to the housing part,
wherein the housing part and the shaft are made of a metallic material,
wherein on the ring part an electrically conductive fleece is arranged, which touches the shaft,
wherein the nonwoven is electrically connected to the housing part.

The advantage here is that no dangerously high potential differences can arise because the fleece causes a potential equalization.

In an advantageous embodiment, the ring member is a metallic ring, in particular flange, to which the fleece attached, in particular cohesively connected, in particular glued, is,
wherein the ring member axially secures a bearing of the shaft, the bearing being received in the housing member. The advantage here is that the fleece is electrically connected to the ring, which is connected to the housing part and thus also electrically connected to the housing part.

In an advantageous embodiment, the ring member is a sleeve, in particular a metallic executed sleeve, in particular a hollow cylinder, wherein attached to the ring member, the nonwoven, in particular materially connected, in particular glued is,
in particular wherein a shaft seal is received by the housing part, which seals to the shaft, wherein the web is disposed axially between the shaft seal and the sleeve.
in particular, wherein the ring member is received by the housing part. The advantage here is that the fleece is attached to a stable sleeve, which is itself electrically conductive executable. The sleeve is received in the housing part. Thus it is important that the fleece touches the shaft and thus establishes the electrical contact. In this way, the housing part is electrically conductively connected to the sleeve, which in turn is electrically connected to the nonwoven, which is in sliding contact with the shaft. Thus, the electrical potentials of the housing part and the shaft are balanced. Because the fleece is electrically conductive.

In an advantageous embodiment, the ring member is a shaft seal, in particular a made of an electrically non-conductive material shaft seal,
wherein the nonwoven fabric is materially bonded to the shaft seal, in particular adhesively bonded. The advantage here is that an anyway necessary part is provided with the fleece and thus provides for the electrical compensation.

In an advantageous embodiment of the radial inner end portion of the web from the shaft seal axially pioneering and radially outwardly arranged end portion of the web from the shaft seal axially pointing away. The advantage here is that a sufficiently large axial distance to the sealing lip is maintainable.

In an advantageous embodiment of the radial inner end portion of the web from the shaft seal axially pioneering and radially outwardly disposed end portion of the web to the shaft seal axially pointing. The advantage here is that in turn a sufficiently large axial distance between the fleece and sealing lip is maintained. Radially outward, there is no danger to the function of the shaft seal, since there occurs no relative movement between the housing part and shaft seal and therefore also no possibly detaching fiber of the web can cause a malfunction.

In an advantageous embodiment, a further shaft sealing ring is arranged axially next to the shaft sealing ring,
wherein the web is disposed axially between the two shaft sealing rings. The advantage here is that the fleece is arranged particularly well protected because no dirt particles can get into the Schleifkontaktberiech of the web to the rotor shaft and thus no interruption of the sliding contact can be effected.

In an advantageous embodiment, the ring member is a bearing of the shaft to which the fleece attached, in particular cohesively connected, in particular glued, is,
in particular wherein a shaft seal is received by the housing part, which seals to the shaft, wherein the web is disposed axially between the shaft seal and the sleeve.
in particular, wherein the bearing is received by the housing part. The advantage here is that the anyway existing bearing is provided with the fleece and thus allows an electrical sliding contact of the fleece with the non-woven rotatably arranged shaft. It is even an attachment of the fleece on the inner ring of the bearing, ie on the rotating part, allows, in which case, however, there is a higher relative rotational speed.

In an advantageous embodiment, the nonwoven carbon and Teflon. The advantage here is that the carbon fibers of the nonwoven are electrically conductive us thus a good electrical contact can be effected.

In an advantageous embodiment, the fibers of the nonwoven which contact the shaft are oriented substantially tangentially to the shaft, ie, in particular, no fiber of the nonwoven contacting the shaft is aligned radially with respect to the shaft. The advantage here is that during rotational movement, the elastically pressed onto the shaft fibers of the nonwoven be taken a little and thus lie substantially tangential.

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 options of claims and / or individual claim features and / or features of the description and / or figures, in particular from the task and / or by posing the task by comparison with the prior art task.

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

In the 1 a truncated electric motor is shown, wherein a shaft seal ( 2 . 9 ) a housing part 4 to a rotor shaft 1 seals off. For this four variants (A, B, C, D) are shown.

In the 2 is a flange ring as an alternative electrical drain 22 on the housing part 4 arranged, wherein radially between the flange 22 and the rotor shaft 1 a fleece 21 is arranged. The fleece 21 is preferably on the flange ring 22 glued. The flange ring 22 secures against a step of the housing part 4 employed camps 20 , in particular its outer ring, axially. The inner ring of the bearing 20 is on the rotor shaft 1 received, is located at a stage of the rotor shaft 1 on and is axial with a locking ring 23 secured.

As in 1 shown, the rotor shaft is rotatably supported by bearings to the housing of the electric motor, wherein the housing of the electric motor, the housing part 4 and associated stator housing 7

At the stator housing 7 a terminal box is arranged, in which the electrical connections of the stator winding of the electric motor are available for connection.

Rotationally fixed to the rotor shaft 1 attached is a short circuit cage. Thus, the electric motor is designed as an asynchronous motor. The stator winding is fed by an inverter, so that the speed is controllable or adjustable.

As in 1 shown in variant A, is the shaft seal 2 in the housing part 4 recorded, with its sealing lip on the rotatably mounted rotor shaft 1 runs, so to the rotor shaft 1 seals off.

At an axial end region, in particular at the end region which is axially remote from the sealing lip, there is an annular fleece 3 cohesively connected to the shaft seal 2 , in particular glued to the shaft seal 2 , The fleece 3 is electrically conductive, wherein it is radially outside the housing part 4 touched and radially inward on the rotor shaft 1 grinds.

Thus, electrical charges and / or voltage differences between the rotatably mounted rotor shaft 1 and the housing part 4 degraded and avoided.

The shaft seal 2 has a metallic support member which is overmolded with a plastic. Thus, the shaft seal 2 electrically non-conductive and can not degrade electrical charges.

The fleece 3 is manufactured with oversize, so that it rests radially on the outside and inside. For this purpose, when manufacturing the outer diameter of the web 3 chosen larger than the clear inside diameter of the housing part 4 at the for the fleece 3 intended position.

When mounting the shaft seal 2 in the fleece 3 remote axial direction into the housing part 4 inserted. Therefore, the radially outwardly protruding part before assembly in the reverse axial direction.

The rotor shaft 1 becomes in the from the sealing lip to the fleece 3 pushed in the direction of axial direction. Therefore, the radially inwardly projecting before assembly in the opposite direction of the axial direction.

Overall, therefore, in the 1 Shown sectional view of variant A the fleece 3 a U-shaped cross section.

Alternatively or additionally, the fleece 3 also form-fitting and / or otherwise attachable to the shaft seal 2 ,

In contrast to variant A, the assembly sequence is different in variant B, and thus the relative directions of movement differ. In particular, the rotor shaft 1 against the from the sealing lip to the fleece 3 pushed in the direction of axial direction. Therefore, the radially inwardly projecting part in the corresponding direction and therefore also has in total in 1 Shown sectional view of variant B the fleece 3 a rather S-shaped cross section.

In contrast to variant A is variant C still another shaft seal 9 in the housing part 4 taken to the rotor shaft 1 seals off.

Thus, the fleece 3 axially between the two shaft seals 2 and 9 arranged.

The electrical contact function of the fleece 3 to the rotor shaft 1 and also to the housing part 4 is therefore not disturbed by dirt particles, as the further shaft seal 9 prevents this penetration.

In contrast to the variants A, B and C is in variant D, the fleece 3 at the shaft seal 9 facing side of a sleeve 5 arranged. Here, a cohesive connection, in particular adhesive connection, and / or a connection by means of rivets or by means of a claw is made possible.

The shaft seal used in Variant D. 9 in turn protects the fleece 3 against penetration of dirt particles.

The fleece 3 respectively 21 has Teflon and carbon fibers. The carbon fibers are electrically conductive and wear only extremely low, so that a long service life can be achieved. The fibers of the fleece 3 they are all essentially tangential to the shaft; none of the fibers of the web contacting the shaft 3 are aligned radially. This is the fleece 3 pressed against the shaft under elastic bias to the shaft so that, if necessary, radially rotationally moved fibers are entrained in the direction of rotational movement of the shaft during rotation and thus then lie substantially tangentially to the shaft. Therefore, even a random fleece as fleece 3 usable.

In a further embodiment of the invention, instead of the sleeve 5 a rolling bearing, in particular ball roller bearings or cylindrical roller bearings used, so that the fleece is adhered to an outer side of the rolling bearing and / or is held in a form-fitting manner.

LIST OF REFERENCE NUMBERS

1

rotor shaft

2

Shaft seal

3

fleece

4

Housing part, in particular flange

5

shell

6

fan cover

7

stator

8th

junction box

9

another shaft seal

20

camp

21

fleece

22

flange

23

circlip

Claims (9)

Shaft assembly having a ring member, a housing part and a rotatably mounted to the housing part shaft, wherein the ring member is rotatably connected to the housing part, wherein the housing part and the shaft are made of a metallic material, characterized in that on the ring member an electrically conductive Fleece is arranged, which contacts the shaft, wherein the fleece is electrically connected to the housing part. Shaft arrangement after Claim 1 , characterized in that the ring member is a metallic ring, in particular flange, to which the fleece attached, in particular materially connected, in particular glued, wherein the ring member axially secures a bearing of the shaft, wherein the bearing is accommodated in the housing part. Shaft arrangement after Claim 1 , characterized in that the ring member is a sleeve, in particular a metallic executed sleeve, in particular a hollow cylinder, to which the fleece attached, in particular materially connected, in particular glued, in particular wherein a shaft seal is received by the housing part, which towards the shaft seals, wherein the web is disposed axially between the shaft seal and sleeve. in particular, wherein the ring member is received by the housing part. Shaft arrangement after Claim 1 , characterized in that the annular part is a shaft sealing ring, in particular a made of an electrically non-conductive material shaft seal, wherein the non-woven is materially connected to the shaft seal, in particular adhesively bonded. Shaft arrangement according to at least one of the preceding claims, characterized in that the radially inner end portion of the web from the shaft seal axially pioneering and radially outwardly disposed end portion of the web from the shaft seal axially wegweisend is arranged, or that the radially inwardly disposed end portion of the web from the shaft seal axially pointing the way and arranged radially outwardly end portion of the web to the shaft seal axially pointing. Shaft arrangement according to at least one of the preceding claims, characterized in that the fibers of the nonwoven fabric contacting the shaft are aligned tangentially to the shaft, in particular so that no fiber contacting the shaft of the nonwoven is aligned radially to the shaft. Shaft arrangement according to at least one of the preceding claims, characterized in that axially adjacent to the shaft sealing ring, a further shaft sealing ring is arranged, wherein the web is arranged axially between the two shaft sealing rings. Shaft arrangement after Claim 1 , characterized in that the ring member is a bearing of the shaft to which the fleece attached, in particular materially connected, in particular glued, in particular wherein a shaft seal is received by the housing part, which seals to the shaft, wherein the web axially between shaft seal and Sleeve is arranged. in particular, wherein the bearing is received by the housing part. Shaft arrangement according to at least one of the preceding claims, characterized in that the fleece comprises carbon and Teflon.

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