DE102015012796A1 - Drive, comprising electric motor with motor housing, rotor shaft, fan cover, adapter and angle sensor - Google Patents

Abstract

Drive, comprising electric motor with motor housing, rotor shaft, fan cowl, adapter and angle sensor, wherein the adapter has an adapter flange and a rotatably mounted relative to this adapter shaft, wherein the fan cowl is connected to the motor housing, wherein the adapter shaft is rotatably connected to the rotor shaft, wherein a rolling bearing is received in the adapter flange, whose outer ring is arranged axially between two spring elements, in particular spring washers, and whose inner ring is employed against the collar of a plastic bush, which is arranged between the inner ring and the adapter shaft.

Description

The invention relates to a drive, comprising electric motor with motor housing, rotor shaft, fan cover, adapter and angle sensor.

It is generally known that an angle sensor for detecting the angular position of the rotor shaft can be provided on an electric motor and a brake for braking the rotor shaft.

The invention is therefore the object of developing an electric motor, wherein initiated by the brake shocks are to be kept away from the angle sensor.

According to the invention, the object is achieved in the electric motor according to the features indicated in claim 1.

Important features of the invention in the drive are that the drive has an electric motor with motor housing, rotor shaft, fan cowl, adapter and angle sensor,
the adapter having an adapter flange and an adapter shaft rotatably mounted relative thereto,
wherein the fan cover is connected to the motor housing,
wherein the adapter shaft is rotatably connected to the rotor shaft,
wherein a rolling bearing is accommodated in the adapter flange,
whose outer ring is arranged axially between two spring elements, in particular spring washers, and
the inner ring is made against the collar of a plastic bush, which is arranged between the inner ring and the adapter shaft.

The advantage here is that initiated by the brake to the rotor shaft shocks are damped. In particular, in the axial direction propagating shocks are indeed transmitted from the rotor shaft to the adapter shaft, but attenuated from the plastic bushing to the inner ring of the bearing, in particular angular contact bearing. Since the outer ring is held elastically in the axial direction, the shocks are not derived to the angle sensor, in particular not at the torque arm. In this way, a low-error detection of the angular position of the rotor position can be performed.

In addition, the plastic bushing acts electrically insulating and causes a spacing between the adapter shaft and the inner ring of the bearing. In this way, the plastic bushing causes a resistance to the propagation of coming from the electromagnetically actuated brake forth magnetic fields and also the electrical currents. Also, the angle sensor is well protected against corresponding negative effects of the brake.

In an advantageous embodiment, the angle sensor has a housing and a rotor rotatable relative thereto, which is connected by means of a coupling with the adapter shaft, in particular rotatably connected. The advantage here is that a balance of manufacturing tolerances is effected. Preferably, a dog clutch is used as a coupling, so that a positive torque passage is present and no Winkelvorschübe lost.

In an advantageous embodiment, the clutch is a dog clutch or a bellows coupling. The advantage here is that the safest possible forwarding of the rotational position of the rotor shaft to the rotor of the angle sensor is executable.

In an advantageous embodiment of the adapter flange is executed on its outer circumference non-circular,
in particular so that tab sections of a support plate are elastically tensioned, in particular prestressed, and press on the adapter flange, so that it is non-rotatably connected to the support plate,
in particular wherein the support plate, in particular the tab sections, are additionally screw-connected to the adapter flange. The advantage here is that even by the radially directed pressing the tab portions of the non-circular areas, in particular flats, the adapter flange a rotationally fixed connection between the support plate and adapter flange is effected. The fact that the support plate is screw-connected to the fan cover, turn a rotationally fixed connection with the fan cover is effected and this fan cover rotatably connected to the motor housing.

In an advantageous embodiment, the adapter shaft is screw-connected to the rotor shaft by means of a centrally arranged to the axis of rotation of the rotor shaft screw,
in particular, wherein the screw head of the screw presses the adapter shaft onto the rotor shaft and wherein the screw is screwed into a threaded bore of the rotor shaft. The advantage here is that a simple connection between the rotor shaft and adapter shaft is effected.

In an advantageous embodiment, the adapter shaft has a journal section with which the adapter shaft is inserted into a cylindrical or cone-shaped bore formed in the rotor shaft, in particular for centering the adapter shaft against the rotor shaft,
in particular, wherein the screw is centered through the pin portion and the bore. The advantage here is that a simple centering is executable.

In an advantageous embodiment, the plastic bushing is employed against a stage of the adapter shaft. The spring washers advantageously support the outer ring of the bearing in an axially sprung manner and prevent an axial impact on the adapter flange, which is screw-connected to the transmitter housing. The advantage here is that by means of the screw between adapter flange and fan cover an axially directed bias of the angular bearing is effected, since the rotor shaft is mounted by means of bearings in the motor housing and is pulled when effecting the screw of the adapter flange to the fan cover and thus to the motor housing. In this case, the axially elastically arranged by the spring washers outer ring of the bearing is then pressed in the direction of the fan cover and thus to the motor housing. The inner ring of the bearing thus presses against a collar of the plastic bushing, which is thus pressed against a stage of the adapter shaft. The rotor shaft is bolted to the adapter shaft and may be considered substantially non-axially displaceable as it is supported by bearings in the motor housing.

In an advantageous embodiment, the tab sections are screw-connected to the adapter flange by means of radially oriented screws. The advantage here is that an additional connection is carried out and thus the security is increased.

In an advantageous embodiment, the support plate, in particular the square-shaped frame portion of the support plate, is screw-connected to the fan cover by means of axially oriented screws. The advantage here is that a rotationally fixed connection is achieved in a simple manner and during assembly first the adapter shaft with the rotor shaft is connectable and thus the angle sensor. Only in the last step, the fan cover can be placed and bolted to the motor housing or support plate. In this case, the press-fit bolts of the support plate are pushed through recesses of the fan cowls, in particular through respective grid openings of the fan cowl, and then nuts are screwed onto the press-in bolts.

In an advantageous embodiment, press-in bolts are provided on the support plate, in particular at the corner regions of the square-shaped frame region of the support plate.
wherein the respective press-in bolt projects in each case through a grid opening of the fan cowl lattice of the fan cowl,
in particular, wherein a nut is screwed onto a respective external thread region of the respective press-in pin, which presses the fan cover against the support plate.
in particular, wherein the press-in bolts are axially directed. The advantage here is that a secure rotationally fixed connection can be produced in a simple manner.

In an advantageous embodiment, the fan cover is connected to the motor housing, in particular screw-connected. The advantage here is that a simple inexpensive connection can be effected.

In an advantageous embodiment, the rotor shaft, the adapter shaft and / or the adapter flange made of metal, in particular made of steel or aluminum. The advantage here is that a stable attachment is achievable.

In an advantageous embodiment, the support plate is a stamped and bent part, which is made of sheet steel. The advantage here is that a simple production is possible.

In an advantageous embodiment, the tab sections are connected to the square-shaped frame area of the support plate by means of narrowed bending areas. The advantage here is that a high elasticity in the axial direction in the support plate can be achieved. Because the narrowed bending areas and thus the tab sections attached thereto are spaced apart from one another in the circumferential direction, in particular in the circumferential direction are regularly spaced from each other and have only a small radial wall thickness, the rigidity in the circumferential direction is very high and thus a good torque support can be achieved.

In an advantageous embodiment, the fan cover at least partially surrounds a non-rotatably connected to the rotor shaft fan. The advantage here is that increased security 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 figures:

In the 1 is an oblique view of one with an adapter flange 1 connected angle sensor 2 shown, wherein the adapter flange 1 Flattening has, which tab sections 5 a support plate 3 are elastically pressed.

In the 2 an associated cross section is shown, wherein a fan cover 20 is screwed to the support plate 3 and one in the adapter flange 1 rotatably mounted adapter shaft 22 rotatably connected to a rotor shaft 26 an electric motor, on the motor housing, the fan guard 20 is attached.

In the 3 an associated plan view is shown.

In the 4 is an enlarged section of the 2 shown.

As shown in the figures, the rotatably mounted in the motor housing rotor shaft 26 by means of an axially directed screw 4 screw connected to the adapter shaft 22 , Here is the screw 4 axially through the adapter shaft 22 arranged and screwed with its threaded portion in a threaded bore, which is centered in the rotor shaft 26 is arranged. The screw head of the screw 4 presses the adapter shaft 22 against the rotor shaft 26 ,

The adapter shaft 22 is by means of a rolling bearing 23 , which is preferably designed as an angular bearing, in the adapter flange 1 rotatably mounted.

The angle sensor is with its stationary part, in particular housing part, rotatably with the adapter flange 1 connected. The rotor, so the rotatable part of the angle sensor is by means of a coupling 24 with the adapter shaft 22 connected, in particular on the rotor shaft 26 opposite side of the adapter flange 1 ,

Axially in front of and behind the rolling bearing 23 is in the 1 Adapter flange each received a shaft seal, each on the adapter shaft 22 running.

The fan cover 20 is connected, in particular screw-connected, with the motor housing of the electric motor. On the side of the fan cover facing away from the motor 20 has these grid openings. Thus, it is possible that through the grid openings of the fan cover 20 one from with the rotor shaft 26 rotatably connected fan funded air flow passes in the axial direction.

The adapter flange 1 has at least two flats on its circumference, in particular it is therefore executed out of round. Thus, the tab sections 5 of the support plate 3 elastically biased while pressed against the flats. Thus, the support plate 3 rotatably connected to the adapter flange 1 ,

To further increase safety is the support plate 3 by means of radially directed screws 6 screwed to the adapter flange 1 ,

The support plate 3 has a square frame portion, wherein the normal of the square comprising the plane is directed parallel to the rotor shaft axis.

On a respective side of the square is the respective tab portion 5 arranged angled. In this case, a bending angle of preferably 90 ° is carried out, so that the tab sections 5 essentially tangential to the adapter shaft 1 are aligned.

At the corner portions of the square frame portion of the support plate 3 are press-fit bolts 25 provided pressed. Here are the press-in bolts 25 arranged axially directed and positively pressed pressed connected to the support member 3 ,

The press-fit bolts are through grid openings of the fan guard 20 passed. With the respective threaded area of the press-in bolts 25 is each a mother 7 screwed, which the fan cover 20 to the support plate 3 presses.

The radially directed screws 6 are by axially directed slots of the support plate 3 passed. Thus, an axial compensation is possible. In particular, the fan cover is made of sheet metal and thus is the axial position of the support plate 3 and the ventilation grille of the fan cowl 20 axially not exactly fixed. By means of slots but the support plate in different axial positions can be screwed to the adapter flange 1 ,

The square frame section of the support plate 3 So it is on the motor side of the fan cowl 20 arranged. The tab section 5 on the other hand, the fan cowl is essentially on the side facing away from the engine 20 arranged.

The inner ring of the rolling bearing 23 is in a socket 21 This bush has a collar section so that the inner ring is turned against this collar. The socket 21 is preferably made of an electrically insulating material that is softer than the material of the inner ring and the material of the adapter shaft 22 ,

The socket 21 turn is against one of the adapter shaft 22 molded and / or formed paragraph.

Thus, the socket 21 between adapter shaft 22 and inner ring interposed. The Rifle 21 thus isolates the inner ring of the adapter shaft 22 ,

The outer ring of the rolling bearing 23 is axially between two spring washers 41 arranged. A first of the spring washers presses 41 on an axial end face of the rolling bearing 23 and rests against one on the adapter flange 1 trained paragraph. The spring washer thereby covers a radial distance region, which overlaps with the radial distance range covered by the outer ring and is arranged radially outside the radial distance range covered by the inner ring.

In the circumferential direction, the spring washer 41 different axial positions, which are preferably in sinusoidal dependence. Thus, the spring washer 41 arranged axially meandering in the circumferential direction.

On the other side of the outer ring is a second spring washer 41 arranged, which in turn presses on the other axial end face of the outer ring and is supported on the retaining ring 40 , which is received in a circumferential groove of the adapter flange, in particular snapped.

The from the circlip 40 Covered radial distance range in turn overlaps with that of the second spring washer 41 covered radial distance range. It is also from the circlip 40 covered radial distance range in turn radially outside of the inner ring covered radial distance range.

Thus, the outer ring is slidably disposed in the axial direction and is held axially by the two elastically biased spring washers.

In this way, a damping of axially coupled shocks is achieved. For example, when venting or collapse of a brake arranged on the engine is a shock on the rotor shaft 26 initiated. By means of the soft material, such as plastic, this shock to the inner ring of the bearing 23 diminished.

Likewise, from an electromagnet of the brake in the rotor shaft made of steel 26 initiated magnetic fields at their propagation to the rolling bearing 23 prevented. Because the material of the socket 21 is preferably diamagnetic. Harmful electrical currents or magnetizations of metallic parts of the rolling bearing are thus avoided.

On the one hand stabilizes the square frame of the support plate 3 through the screw connection with the fan cover 20 this fan guard in the circumferential direction and radial direction, on the other hand, is due to the thin-walled design of the fan guard 20 realized in the axial direction shock absorption.

Thus, the torque arm of the angle sensor 2 executed in the circumferential direction harder than in the axial direction. The torque support is the housing of the angle sensor 2 with the adapter flange 1 connected and this over the support plate 3 with the fan cover 20 , which in turn is connected to the motor housing.

On the outer ring of the rolling bearing 23 axially facing away from the locking ring 40 the first shaft sealing ring is arranged and on the outer ring of the rolling bearing 23 axially facing away from the first spring washer 41 the second shaft seal is arranged.

The outer ring of the rolling bearing 23 touches the adapter flange 1 and is thus electrically connected to this.

The adapter flange 1 , the rotor shaft 26 and the adapter shaft 22 are made of metal or plastic, preferably steel or aluminum.

The adapter shaft 22 has a pin-like extension, which in a center of the rotor shaft 26 arranged bore is inserted, which is thus effective as a centering. The screw 4 goes through this cone-like extension in the middle and is itself in turn with the center of the rotor shaft 26 screw-connected.

Preferably, the screw connection between screw 4 and rotor shaft 26 Self-locking executed.

The coupling 24 is preferably designed as a dog clutch, wherein in the circumferential direction between the claws a star-shaped damping body can be arranged, in particular whose beam areas are performed crowned. The damping body is preferably made of a plastic. Alternatively, the clutch 24 also executable as a bellows coupling.

The waistband of the bush 21 has larger radial distances than the remaining area of the bush 21 ,

The tab sections 5 , so areas of the backing sheet 3 , are by means of narrowed bending areas with the square frame portion of the support plate 3 connected. In this way, an improved shock absorption can be achieved.

The rolling bearing 23 is preferably designed as angular contact ball bearings.

LIST OF REFERENCE NUMBERS

1

adapter flange

2

angle sensor

3

Support plate, in particular torque arm

4

screw

5

tab portion

6

screw

7

mother

20

Fan cover, in particular made of sheet metal

21

Rifle

22

Adapter shaft, in particular of steel

23

Rolling bearings, in particular angular contact bearings

24

clutch

25

Einpressbolzen

26

rotor shaft

40

circlip

41

spring washer

Claims (15)

Drive, comprising electric motor with motor housing, rotor shaft, fan cover, adapter and angle sensor, wherein the adapter has an adapter flange and a rotatably mounted relative to this adapter shaft, wherein the fan cover is connected to the motor housing, characterized in that the adapter shaft rotatably connected to the rotor shaft is, wherein in the adapter flange, a rolling bearing is received, the outer ring is arranged axially between two spring elements, in particular spring washers, and whose inner ring is employed against the collar of a plastic bush, which is arranged between the inner ring and the adapter shaft. Drive according to at least one of the preceding claims, characterized in that the angle sensor has a housing and a rotor rotatable relative thereto arranged, which is connected by means of a coupling with the adapter shaft, in particular rotatably connected. Drive according to at least one of the preceding claims, characterized in that the coupling is a dog clutch or a bellows coupling. Drive according to at least one of the preceding claims, characterized in that the adapter flange is executed on its outer circumference out of round, in particular so that tab portions of a support plate are stretched elastically, in particular biased, and press on the adapter flange so that it is rotatably connected to the support plate in particular wherein the support plate, in particular the tab sections, are additionally screw-connected to the adapter flange. Drive according to at least one of the preceding claims, characterized in that the adapter shaft is screw-connected to the rotor shaft by means arranged centrally to the axis of rotation of the rotor shaft screw, in particular wherein the screw head of the screw presses the adapter shaft on the rotor shaft and wherein the screw in a threaded bore of the rotor shaft is screwed. Drive according to at least one of the preceding claims, characterized in that the adapter shaft has a pin portion with which the adapter shaft is inserted into a bore introduced into the rotor shaft, in particular cylindrical or conical bore, in particular for centering the adapter shaft against the rotor shaft, in particular the screw is centered through the pin portion and the bore. Drive according to at least one of the preceding claims, characterized in that the plastic bushing is employed against a stage of the adapter shaft. Drive according to at least one of the preceding claims, characterized in that the tab sections is screw-connected to the adapter flange by means of radially oriented screws. Drive according to at least one of the preceding claims, characterized in that the support plate, in particular the square-shaped frame portion of the support plate is screw-connected by means of axially oriented screws with the fan cover. Drive according to at least one of the preceding claims, characterized in that on the support plate, in particular at the corner areas square-shaped frame portion of the support plate, press-in bolts are provided pressed, wherein the respective press-in bolt in each case protrudes through a grid opening of the fan cowl grille of the fan cowl, in particular wherein a nut which presses the fan cowl against the support plate is screwed onto a respective external thread area of the respective press-in pin. in particular, wherein the press-in bolts are directed axially, Drive according to at least one of the preceding claims, characterized in that the fan cover connected to the motor housing, in particular screw-connected, is. Drive according to at least one of the preceding claims, characterized in that the rotor shaft, the adapter shaft and / or the adapter flange made of metal, in particular steel or aluminum, are made. Drive according to at least one of the preceding claims, characterized in that the support plate is a stamped and bent part, which is made of sheet steel. Drive according to at least one of the preceding claims, characterized in that the tab sections are connected to the square-shaped frame region of the support plate by means of narrowed bending areas. Drive according to at least one of the preceding claims, characterized in that the fan cover at least partially surrounds a non-rotatably connected to the rotor shaft fan.

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