WO2014079968A2

WO2014079968A2 - Arrangement for mounting a shaft having axial securement

Info

Publication number: WO2014079968A2
Application number: PCT/EP2013/074461
Authority: WO
Inventors: Francisco Rojo; Yury DERKACH
Original assignee: Ebm-Papst St. Georgen Gmbh & Co. Kg
Priority date: 2012-11-26
Filing date: 2013-11-22
Publication date: 2014-05-30
Also published as: WO2014079968A3; DE202012104586U1; DE112013005639A5

Abstract

An arrangement comprises: a rotor (22) having a shaft (34) which has an associated longitudinal axis (37); a bearing arrangement (40, 52) which is designed for rotatably mounting the shaft (34) and which has at least one opening (131, 133); a securing member (60; 90) which is arranged on the shaft (34) and has a spring element (80) which can be transferred by elastic deformation from a first state into a second state, wherein, in the second state, the spring element (80) is closer at least in certain regions to the shaft (34) than in the first state; wherein the securing member (60; 90) and the shaft (34) are designed such that, in the first state of the securing member (60; 90), they have a first outer cross section which prevents a common movement through the at least one opening (131, 133) so as to axially secure the shaft (34) with respect to the bearing arrangement (40,52), and wherein the securing member (60; 90) and the shaft (34) are designed such that, in the second state of the securing member (60; 90), they assume a second outer cross section which allows a common movement through the at least one opening (131, 133).

Description

Arrangement for supporting a shaft with axial securing

The invention relates to an arrangement for supporting a shaft with an axial securing.

In electric motors usually a rotor with a shaft via a

Bearing arrangement mounted on a stator. For this purpose, the wave is in the

Warehouse arrangement introduced, and one speaks of a marriage of the rotor with the stator. If such an electric motor is used, for example, in a vehicle, it must be ensured that the rotor does not slide out of the stator in the event of a collision with the vehicle. This is called axial securing of the shaft.

The US 2002/101 124 A1 shows in the description of the known prior art, an electric motor in which the shaft is inserted from one side of the bearing assembly starting in this and then axially secured on the opposite side of the bearing assembly by a C-ring. In this known axial securing an access in the direction of the opposite side of the bearing assembly is required after insertion of the rotor shaft to secure the C-ring to the shaft in a further process step. Around

then make a seal with the side of the C-ring as z. B. may be required in sintered storage or application areas in a humid environment, a suitable for sealing component must be attached in an additional process step. These process steps complicate and extend the production and require additional technical and financial expense.

DE 20 2004 010 890 U1 shows a bearing arrangement with a sintered bearing and an axial securing, wherein the axial securing has at least one resilient securing member which is fastened to the housing of the electric motor. The rotor shaft has a constriction and a specially shaped shaft end in order to insert the shaft into the arranged on an associated bearing support tube bearing assembly to allow a compression or snapping the pre-assembled, resilient securing members in the constriction. Since oil is used as a lubricant in sintered bearings, it is advantageous to make the area of the bearing support tube at the shaft end fluid-tight. In this case, however, the resilient securing members are complex to manufacture, and their assembly must be done with great precision to ensure a respectively required fluid tightness and precise alignment of the resilient securing members relative to the shaft, so that no friction between the resilient securing members and the shaft occurs.

It is therefore an object of the present invention to provide a novel arrangement for supporting a shaft. This object is achieved by the subject matter of the independent patent claim. Preferred embodiments are the subject of the dependent claims.

In particular, the object of the present invention is achieved by an arrangement which comprises:

A rotor having a shaft which has an associated longitudinal axis, a bearing arrangement designed for the rotatable mounting of the shaft, which has at least one opening; a fuse element arranged on the shaft with a spring element which can be converted from a first state into a second state by elastic deformation, the spring element being at least partially closer to the shaft in the second state than in the first state; wherein the securing member and the shaft are adapted to be in the first state of

Secured member to have a first outer cross-section, a

prevents common movement through the at least one opening, to effect axial securing of the shaft with respect to the bearing assembly, and wherein the securing member and the shaft are adapted to assume, in the second state of the securing member, a second outer cross section having a common movement through the at least one an opening allows.

This can be done by providing one on an associated shaft

arranged securing member having an elastically deformable spring element, which is adapted to, in a kraftbeaufschlagten state a

common movement of securing member and shaft through an opening of a associated bearing assembly for mounting the shaft in the bearing assembly to allow and in a power-free state to prevent such joint movement to effect axial securing of the shaft mounted in the bearing assembly relative to the bearing assembly, the number of required components can be reduced, so costs the production can be saved. In addition, this can be a simple and quick installation of the shaft in the bearing assembly by pushing through the provided with the securing member shaft through the bearing assembly allows.

According to a preferred embodiment, the securing member and the at least one opening are formed such that the spring element is at least partially applied by the bearing assembly in the joint movement of the shaft and the securing member through the at least one opening and thereby passes into the second state. This allows mounting without an additional tool.

According to a preferred embodiment, the spring element is adapted to automatically go to the first state, when it is not acted upon by an external force. This facilitates assembly, since no tool is required to bring the spring element in the first state.

According to a preferred embodiment, the shaft has a constriction, wherein the securing member is at least partially disposed in the constriction. This makes it possible to hide the securing member or the spring element during assembly at least partially within the basic diameter of the shaft.

According to a preferred embodiment, the securing member is arranged completely in the constriction in the second state. This allows a direct bearing of the bearings on the shaft, while still mounting the

Secured member before insertion of the shaft is possible. According to a preferred embodiment, the constriction is at least partially groove-shaped. This allows the shaft in the

appropriate area are well received.

According to a preferred embodiment, the securing member

Supporting elements which limit an axial movement of the securing member relative to the shaft such that the securing member can deflect into the constriction. This ensures that the securing member does not slip so far during assembly that the compression takes place in the constriction and not against the area with the maximum shaft diameter.

According to a preferred embodiment, the shaft has a maximum outer diameter, and an outer diameter of the securing member is less than or equal to the maximum in the second state of the spring element

Outer diameter of the shaft. This ensures that an assembly with the selected bearing arrangement is easily possible because the shaft is usually pushed by the bearing assembly.

According to a preferred embodiment, the spring element is formed in the first state of the spring element for abutment against a support member to a

Slipping out of the shaft to prevent the bearing assembly. This results in a preferred way of securing the shaft.

According to a preferred embodiment, the support member is through the

Bearing arrangement formed. This is advantageous because in this solution, no additional support member is needed, which is alternatively attached, for example, on the bearing tube or on a cap of the bearing tube.

According to a preferred embodiment, the securing member has at least one spring arm, and the spring element can be converted by elastic deformation of the at least one spring arm in the direction of the longitudinal axis of the shaft from the first state to the second state of the spring element. The use of the spring arm allows an advantageous type of elastic deformation. According to a preferred embodiment, the at least one spring arm in the second state of the spring element is at least approximately parallel to

Longitudinal axis of the shaft aligned. This embodiment makes it possible to provide as much material over the entire length of the spring element and thus to provide a stable spring element.

According to a preferred embodiment, the at least one spring arm in the first state of the spring element is aligned at a predetermined angle obliquely to the longitudinal axis of the shaft. The predetermined angle is thus greater than 0 ° in the first state. The fact that the spring arm is not parallel to the shaft, it can serve as a safeguard against falling out of the shaft.

According to a preferred embodiment, the securing member has a support member fixed to the shaft or fixed on the shaft, on which the at least one spring arm is formed. The support member allows a

Connection of the securing member with the shaft, so that the securing member can not be stripped from the shaft. A rotation of the securing member on the shaft, however, is in principle harmless. A rotation can also be prevented if necessary, for example, the shaft is not a

Has rotationally symmetrical groove, so that the locking member digs in a rotation about the shaft.

According to a preferred embodiment, the support member is formed ring-segment-shaped to allow Aufklippsen the securing member to the shaft. This allows easy mounting of the securing member on the shaft, wherein the spring elements are held anyway.

According to a preferred embodiment, the bearing assembly comprises a sliding bearing or a rolling bearing. Plain bearings and rolling bearings are well suited

Slipping out of the locking member and thus to prevent the shaft.

According to a preferred embodiment, the bearing arrangement a

Sintered storage on. Sintered bearings are well suited to slipping out of the

Securing member and thus the shaft to prevent. According to a preferred embodiment, the bearing assembly has a first contact surface and a second contact surface, wherein the first contact surface and the second contact surface are offset relative to each other in the direction of the longitudinal axis of the shaft and are adapted for contact with the shaft, and wherein the first contact surface first opening and the second contact surface defining a second opening, and wherein the shaft and the shaft arranged on the

Secured member are adapted to an insertion of the shaft and the

To allow securing member both through the first opening and through the second opening. As a result, with axially spaced openings of two contact surfaces of the bearing arrangement, it is possible to fasten the securing member to the shaft already before insertion into the first opening.

Further details and advantageous developments of the invention will become apparent from the hereinafter described and illustrated in the drawings, to be understood in any way as limiting the invention

Embodiments. Show it:

Fig. 1 is a plan view of an underside of a fan housing

provided fan,

2 is a sectional view of a detail of the fan of FIG. 1, which has an arrangement according to the invention with a securing member according to an embodiment, seen in the direction of arrows II-II of FIG. 1, FIG.

3 shows a section through the fan housing according to the invention of FIG. 2 of FIG. 1, seen in the direction of arrows III-III of FIG. 1,

4 is an enlarged view of a section IV of Fig. 3,

5 is a perspective view of the securing member of FIGS. 2 to 4 according to an embodiment, 6 is a side view of the securing member of Fig. 5,

7 is a plan view of the securing member of Fig. 5 and 6,

FIG. 8 is a sectional view of the securing member of FIGS. 5 to 7, viewed in FIG

Direction of arrows Vlll-VIII of Fig. 7,

9 is a perspective view of a securing member according to a

alternative embodiment,

Fig. 10 is a plan view of the securing member of Fig.9, and

Fig. 1 1 to Fig. 14 is a schematic representation of the common insertion of the securing member and the shaft in the bearing assembly.

In the following description, the terms left, right, up and down refer to the respective drawing figure and depending on a selected orientation (portrait or landscape) of a

Drawing figure to the next vary. Identical or equivalent parts are denoted in the various figures with the same reference numerals and

usually described only once.

Fig. 1 shows a fan 10, which is exemplified as an axial fan.

According to a preferred embodiment, the fan 10 can be used as a device fan. However, the fan 10 is not limited to axial fans.

Rather, other types of fans, such as diagonal fans or radial fans can be used.

The fan 10 has a fan housing 1 1, which can be uniformly made of plastic or metal or any hybrid form thereof and in its interior has approximately the shape of a cylindrical tube 21, at one axial end of which provided for mounting a drive motor 20, also designated as the hub mounting flange 15 is provided. This

Mounting flange 15 is over several thin holding webs, illustratively four webs 16, 17, 18, 19, connected to the fan housing 1 1, which preferably in its corners or at least in its edge regions fastening openings 95, 96, 97, 98, to an attachment of the fan housing 1 1 in an associated device and thus a use allow the fan 10 as a device fan.

The drive motor 20 preferably has an outer rotor 22 and an inner stator 44 and serves to drive a provided with fan blades 26 Axiallüfterrades, which is formed by the outer rotor 22 and an associated

Rotary shaft 37 (see Fig. 2) is rotatable. The shape of the fan blades 26 is adapted to the shape of the inside of the tube 21.

FIG. 2 shows a detail of the fan 10 of FIG. 1 with the drive motor 20, which has the outer rotor 22 and the inner stator 44. The drive motor 20 is an external rotor motor according to one embodiment.

The inner stator 44 has a laminated stator core 12, which is provided in a manner known to those skilled in the art with an associated motor winding 13 which is provided for interaction with a rotor magnet 28. The laminated stator core 12 is arranged on the outer circumference of a bearing support tube 38, preferably pressed onto it, and mechanically connected to a printed circuit board 46. The bearing support tube 38 is integrally formed on the holding webs 16, 17 (and 18, 19 of Fig. 1) connected to the mounting flange 15 of the fan housing 1 1 of Figure 1 and / or formed integrally therewith.

The outer rotor 22 preferably has a rotor bell 24 made of plastic, on the outer periphery of the fan blades 26 are arranged, which in operation, depending on

Turning direction and with reference to FIG. 1, either pull the rotor 22 to the left or press to the right. In the rotor bell 24, a magnetic yoke 27 is attached from soft iron, and on the inside of which preferably radially magnetized rotor magnet 28, the z. B. can be magnetized four-pole.

The rotor bell 24 has a bottom 30 in which a corrugated upper shaft end 32 of a rotor shaft 34 is secured by plastic syringes whose lower, free Shaft end is denoted by 35. The rotor shaft 34 is preferably made of steel, but it may for example also be formed of plastic.

For radial support of the shaft 34 is a bearing assembly 40, 52, which preferably has at least one sliding bearing and / or at least one rolling bearing. As a plain bearing is preferably a sintered bearing application.

The bearing assembly 40, 52 has at least one opening 131, 133 and preferably forms at least a first and a second contact surface 31 bzw.33 for rotatably supporting the shaft 34, wherein the number of contact surfaces can be selected application-specific. The first contact surface 31 and the second contact surface 33 are offset relative to each other in the direction of the longitudinal axis 37 of the shaft 34 and spaced from each other and formed for contact with the shaft 34, wherein the first contact surface 31, a first opening 131 and the second contact surface 33rd defines a second opening 133, wherein the first and / or second opening 131, 133, the at least one opening 131, 133 of the

Bearing arrangement 40, 52 represent.

According to one embodiment, the bearing assembly 40, 52 is inside the

Lagertrag raw res 38 attached, preferably by pressing, and lies with her - in Fig. 1 lower - end against a formed in the bearing support tube 38, inner

Ring shoulder 74 on. On the outside of the bearing support tube 38, the inner stator 44 of the drive motor 20 is fixed, also the circuit board 46, which is supported on an outer collar 78 of the bearing support tube 38 and to which, as shown, a Hall IC 48 is fixed, the stray field of the Rotor magnet 28 is controlled.

securing member

For axially securing the position of the shaft 34 in the bearing assembly 40, 52, a securing member 60 is arranged on the shaft 34 according to one embodiment. This has a spring element (80 in Fig. 4 to 8), which can be converted by elastic deformation of a first state to a second state, wherein the spring element (80 in Fig. 4 to 8) in the second state at least partially closer to the Wave 34 is considered to be in the first state. Here are the securing member 60 and the shaft 34 is adapted to have in the first state of the securing member 60 has a first outer cross-section, which prevents a common movement of shaft 34 and securing member 60 through the at least one opening 131, 133 of the bearing assembly 40, 52 in the direction of an arrow 39 to a axial securing of the shaft 34 relative to the bearing assembly 40,52 to effect and thus slipping out of the shaft 34 of the bearing assembly 40, 52nd

especially during operation of the fan 10 to prevent. In addition, the securing member 60 and the shaft 34 are preferably adapted to take in the second state of the securing member 60 has a second outer cross section, the common movement of shaft 34 and securing member 60 through the at least one opening of the bearing assembly 40, 52 in the direction of an arrow 99 allows, so as to allow mounting of the shaft 34 in the bearing assembly 40, 52.

According to one embodiment, the securing member 60 and the at least one opening of the bearing assembly 40, 52 are formed such that the spring member (80 in Figs. 4 to 8) at least in such a common movement of the shaft 34 and the securing member 60 through the at least one opening of the

Bearing assembly 40, 52 at least partially acted upon by the bearing assembly 40, 52 with force and thereby passes into the second state. Therefore, for ease of description, the second state will be referred to as the "force applied state" hereinafter, moreover, the spring element (80 in Fig. 4 through Fig. 8) is preferably designed to be self-sustaining

force-loaded to go into the first state when it is not subjected to an external force. Therefore, for ease of description, the first state will also be referred to hereinafter as the "non-powered state", yet non-radially acting forces may act on the securing member 60 when, for example, it is pulled against the bearing assembly 40, 52.

The securing member 60 is arranged by way of example in the region of the lower, free shaft end 35 of the shaft 34. For this purpose, a constriction 58 is preferably provided at the lower, free shaft end 35, in which the securing member 60 is at least partially disposed and in which the securing member 60 in

kraftbeaufschlagten state of the spring element (80 in Fig. 4 to 8) partially or can be completely absorbed. Preferably, the constriction 58 is at least partially groove-shaped.

It should be noted, however, that the securing member 60 only

is arranged for example in the region of the lower, free shaft end 35 and not for the purpose of limiting the invention. Rather, the securing member 60 z. B. also be arranged in the region between the first and second contact surface 31, 33 on the shaft 34. Also, the openings 131, 133 may be of different sizes, and the securing member 80 must be able to be spring-biased so that it fits through the smallest opening 131, 133 through which it is pushed. In addition, the lower, free shaft end 35 can additionally form a convex abutment element 56, as shown in FIG. H. forms a smooth, rounded end, which e.g. abuts against a arranged in the mounting flange 15 abutment member 72 made of a ferromagnetic material, for. Example, a disc of sintered iron or a steel disc, preferably between track 66 and bearing member 72, a comparatively thin layer 68 may be inserted from a suitable plastic with a low coefficient of friction. The lobe 66 forms with the abutment member 72 is an axial sliding bearing, which is also referred to as a thrust bearing and whose operation is well known to those skilled in the art, so that a detailed description for the purpose of scarcity of description can be omitted here.

In an exemplary installation of the drive motor 20 in the fan housing 1 1, first the abutment member 72 and the layer 68 are arranged in the interior of the bearing support tube 38. Then, the bearing assembly 40, 52 is pressed into the interior of the bearing support tube 38 and provided with the circuit board 46 inner stator 44 is pressed onto the outer circumference of the bearing support tube 38. Finally, then provided with the securing member 60 shaft 34 of the outer rotor 22 in the

Bearing arrangement 40, 52 inserted, wherein the spring element (80 in Fig. 4 to 8) of the securing member 60 is automatically transferred during insertion into the force-loaded state and after reaching the axial shown in Fig. 2

End position of the shaft 34 automatically goes into its power-free state, so that the shaft 34 is axially secured in position in this axial end position. FIG. 3 shows the shaft 34 provided with the securing member 60 and rotatably mounted in the bearing arrangement 40, 52. In addition, Fig. 3 illustrates the provided with the bearing support tube 38 mounting flange 15 which on the thin support webs 16, 17 (and 18, 19 in Fig. 1) with which the tube 21 forming

Fan housing 1 1 is connected.

4 shows a detailed view of the shaft 34 of the outer rotor 22 of FIG. 3, which is arranged on the shaft 34 and provided with a spring element 80

The shaft 34 illustratively has a maximum outer diameter 36 and is rotatably mounted in the bearing assembly 40, 52 as described above and is by the securing member 60 from slipping out of the

Bearing assembly 40, 52 prevented.

The securing member 60 preferably has a support member 65 fixed on the shaft 34 or fixed to the shaft 34, on which the spring element 80

is trained. In this case, a rotation of the support member 65 is not critical, an axial displacement relative to each other, in which the support member 65 is pushed by the shaft 34, but should be prevented. Preferably that is

Spring element 80 integrally formed on the support member 65 and preferably integrally formed therewith. The outer diameter 59 of the support member 65 is smaller, equal to or slightly larger than the diameter 36 of the shaft 34, he should anyway fit through the openings 131, 133 of the bearing assembly 40, 52 therethrough.

The support member 65 may be positively and / or non-positively connected to the shaft 34 to prevent falling and / or axial displacement of the securing member 60 relative to the shaft 34. Alternatively, axial support members (91, 92, 93 in FIGS. 9 and 10) may be provided on securing member 60 to at least limit such axial displacement as described below in FIGS. 9 and 10. According to one embodiment, an outer diameter 51 of the securing member 60 in the force-loaded state of the spring element 80 is less than or equal to the maximum outer diameter 36 of the shaft 34, cf. Also Fig. 1 1 to Fig. 14 and associated description. Preferably, the outer diameter 59 of the

Secured member 60 in kraftbeaufschlagten state of the spring element 80, however, at least equal to or less than a cross section of the at least one opening 131, 134 of the bearing assembly 40, 52, through which the provided with the securing member 60 shaft 34 is at least partially inserted into the bearing assembly 40, 52 for mounting , The maximum outer diameter 59 corresponds to a diameter formed by the first cross section of FIG. 2.

In the non-powered state of the spring element 80, however, this has a

Outside diameter 51, which in Fig. 2 a diameter of the second

Cross-section forms and slipping out of the provided with the securing member 60 shaft 34 of the bearing assembly 40, 52 prevented. Here, the spring element 80, which has the large outer diameter 51 in the force-free state, formed to rest against an associated support member to prevent slipping out of the shaft 34 from the bearing assembly 40, 52.

Preferably, the support member is formed by the bearing assembly 40, 52. The support member may also be formed by a separate component, for. B. from a between the bearing assembly 40, 52 and the inner annular shoulder 74 arranged support disk.

Fig. 5 shows the securing member 60 with the support member 65 and the thereto

formed spring element 80. The support member 65 is according to a

Embodiment ring-shaped and has an inner opening 69 and an interruption 67, via which a Aufklippsen of the securing member 60 on the shaft 34 of FIG. 1 to 4, or in the constriction 58, is made possible.

The spring element 80 has at least one spring arm 82, 84, 86, 88 assigned to the securing member 60 and connected to the carrier member 65. Illustratively, four spring arms 82, 84, 86, 88 are provided and formed on the support member 65 and integrally formed therewith. By a radially inwardly directed elastic deformation of these spring arms 82, 84, 86, 88, ie in the direction of the longitudinal axis 37 the shaft 34 of Fig. 2, the spring arms 82, 84, 86, 88 and thus the spring element 80 from the power-free state in the force-loaded state can be transferred. This transfer is preferably carried out such that the spring arms 82, 84, 86, 88 in the force-loaded state of the spring element 80 at least approximately parallel to the axis of rotation of the ringsegmentformigen support member 65, and

Longitudinal axis 37 of the shaft 34 of Figure 2 are aligned.

In the force-free state of the spring element 80, the spring arms 82, 84, 86, 88 are preferably aligned at a predetermined angle (89 in Fig. 8) obliquely to the rotational axis of the ringsegmentformigen support member 65, or to the longitudinal axis 37 of the shaft 34 of FIG. Thus, at an angle 89 which is greater than 0 °, so that the spring arms are not parallel to the shaft 34. This results in an illustrative example

Crown-shaped configuration of the securing member 60 in the non-powered state of the spring element 80th

Fig. 6 shows the securing member 60 of Fig. 5, seen in the direction of an arrow 57 of Fig. 5, to illustrate the interruption 67 of the latter

ring segment-shaped carrier member 65th

Fig. 7 shows the securing member 60 of Fig. 5 and 6, seen in the direction of an arrow 55 of Fig. 5, to illustrate its crown-shaped configuration, and to illustrate the inner opening 69 of the ringsegmentformigen

Carrier member 65.

Fig. 8 shows the securing member 60 of Fig. 5 to 7 to illustrate its crown-shaped configuration, which by an arrangement of the spring arms 84, 86, 88 (and 82 in Fig. 5 to 7) at a predetermined angle 89 to the axis of rotation of the ringsegmentformigen Carrier member 65, or to the longitudinal axis 37 of the shaft 34 of Fig.2, is achieved.

9 shows a securing member 90 according to an alternative embodiment, which can be used instead of the securing member 60 of FIGS. 1 to 8 for the realization of the fan 10 and the drive motor 20 of FIGS. 1 and 2, respectively. This has like the securing member 60 of Fig. 1 to 8, the spring element 80 and the ring segment-shaped support member 65 of FIG. 5 to 8.

In comparison to the securing member 60, the securing member 90 additionally has axial support elements 91, 92, 93, which are designed to allow an abutment against a shoulder of the constriction 78 and thus an axial displacement of the on the shaft 34 of Fig. 1 to 4 mounted fuse member 90 at least in the assembly of the fan 10 described in FIG. 2 to prevent or limit it so that the Federlement 80 springs during compression in the constriction 58 into it. For this purpose, the axial support members 91, 92, 93 formed on the ring segment-shaped support member 65, preferably formed on this and preferably integrally formed therewith.

Preferably, the axial extent of the support elements 91, 92, 93 at least so great that even if the support members 91, 92, 93 directly against the

Shoulder of the constriction 58 abut, the spring element 80 of the securing member 90 can spring into the constriction 58. For this purpose, the support elements 91, 92, 93 against the spring element 80 over, as long as this is in the power-free state.

According to one embodiment, the axial support elements 91, 92, 93 are provided on the support member 65 such that they extend at least approximately parallel to the axis of rotation of the ring segment-shaped support member 65, or to the longitudinal axis 37 of the shaft 34 of Figure 2, and both in the force-loaded, and in the non-powered state of the spring element 80 are preferably arranged in the constriction 58 of Fig. 2. Preferably, the axial support members 91, 92, 93 between the spring arms 82, 84, 86, 88 of the spring element 80 on the support member 65th

provided and formed in the manner of support bolts or pins. Thus, an axial displacement of the arranged on the shaft 34 of Fig. 2 securing member 90 on the shaft 34 are at least prevented so far that a compression of the spring element 80 can be ensured at any time with appropriate application of force. The operation of the securing member 90 of FIG. 9 otherwise corresponds to the operation of the securing member 60 of the preceding figures.

Fig. 10 shows the securing member 90 of Fig. 9 to illustrate the am

Carrier member 65 arranged axial support members 91, 92, 93 and of their orientation.

Fig. 11 to Fig. 14 schematically show the insertion of the shaft 34 with the securing member 90 in the bearing assembly 52 with the opening 133. The

Bearing assembly 52 is exemplified as a sliding bearing or as a rolling bearing.

In Fig. 11, the free end of the shaft 34 is inserted into the bearing assembly 52, the spring element 80 of the securing member 90 is still in the force-free, deflected state, the spring arms 84, 86 thus have a

Outside diameter 51 which is larger than the opening 133. In this state, the securing member 90 would not fit through the opening 133 therethrough.

In Fig. 12, the securing member 90 is already partially in the opening 133 of the bearing assembly 52, and by the edges 152 of the bearing assembly 52, which face the insertion of the shaft 34, the securing member 90 is acted upon by a force. As a result, the spring element 80 is partially compressed, and the outer diameter 51 is reduced accordingly. The maximum

Outer diameter 51 is still larger than the opening 133 of the bearing assembly 52nd

13, the securing member 90 is within the opening 133 of the bearing assembly 52. For this purpose, the spring arms 84, 86 have been automatically deflected by the edges 152 (FIG. 12) so far that the outer diameter 51 of the spring element 80 is smaller than the opening 133 the bearing assembly 52 is. This will be a

Slipping of the spring element 90 through the opening 133 of the bearing assembly 52 allows.

In this embodiment, the outer diameter 51 of the securing member 90 is slightly larger than the diameter of the shaft 34. This is because that at a formation of the bearing assembly 52 as a sintered bearing game between the shaft 34 and the bearing assembly 52 must be present. However, the spring element 80 of the securing member 90 is due to the spring action against the

Bearing assembly 52, and this leads to a slightly larger

Outer diameter 51 of the securing member 90 relative to the outer diameter of the shaft 34, even if it is possible in principle, the

Locking member 90 in the force-loaded state to an outer diameter 51 which is smaller than the diameter of the shaft 34th

In an embodiment of the bearing assembly 52 as a rolling bearing, however, a compression of the shaft 34 with the inner ring of the rolling bearing 52 take place, so that the (maximum) outer diameter 51 of the securing member 90 in this case during insertion largely coincides with the diameter of the shaft 34.

Fig. 14 shows the state of the shaft 34 and the securing member 90 after the latter has been completely pushed through the bearing assembly 52. Since the securing member 90 is no longer subjected to force, it assumes the non-powered state with the large outer diameter 51 (see Fig. 1 1) and prevents a common movement together with the shaft 34 through the opening 133 of the bearing assembly 52. This is the shaft 34 secured axially.

Naturally, many modifications and modifications are possible within the scope of the present invention.

Thus, instead of an external rotor motor, e.g. Also an internal rotor motor can be used.

Claims

claims

1 . Arrangement, which has

A rotor (22) having a shaft (34) having an associated longitudinal axis (37);

a bearing assembly (40, 52) adapted to rotatably support the shaft (34) and having at least one aperture (131, 133);

a locking member (60; 90) disposed on the shaft (34)

Spring element (80) which can be converted by elastic deformation of a first state to a second state, wherein the spring element (80) in the second state at least partially closer to the shaft (34) than in the first state;

wherein the securing member (60; 90) and the shaft (34) are configured to have a first outer one in the first state of the securing member (60; 90)

Cross section showing a joint movement through the

prevents at least one opening (131, 133) in order to effect an axial securing of the shaft (34) with respect to the bearing arrangement (40, 52),

and wherein the securing member (60; 90) and the shaft (34) are adapted to assume, in the second condition of the securing member (60; 90), a second outer cross-section which permits common movement through the at least one opening (131,133) ,

2. Arrangement according to claim 1, wherein the securing member (60; 90) and the at least one opening (131, 133) are formed such that the

Spring element (80) in the common movement of the shaft (34) and the securing member (60; 90) through the at least one opening (131, 133) at least partially by the bearing assembly (40,52) is acted upon by force and thereby in the second State passes.

3. Arrangement according to claim 1 or 2, wherein the spring element (80) is adapted to automatically go to the first state, when it is not acted upon by an external force.

4. Arrangement according to one of the preceding claims, wherein the shaft (34) has a constriction (58), wherein the securing member (60; 90) at least partially in the constriction (58) is arranged.

5. Arrangement according to claim 4, wherein the securing member (60; 90) in

second state is completely disposed in the constriction (58).

6. Arrangement according to claim 4 or 5, wherein the constriction (58).

at least partially groove-shaped.

7. Arrangement according to one of claims 4 to 6, wherein the securing member (90) supporting elements (91, 92, 93) which limit an axial movement of the securing member (90) relative to the shaft (34) such that the securing member ( 90) in the constriction (58) can spring.

8. Arrangement according to one of the preceding claims, wherein the shaft (34) has a maximum outer diameter (36) and a

Outer diameter (59) of the securing member (60; 90) in the second state of the spring element (80) is less than or equal to the maximum outer diameter (36) of the shaft (34).

9. Arrangement according to one of the preceding claims, wherein the

Spring element (80) in the first state of the spring element (80) for abutment against a support member (52) is formed to prevent slipping out of the shaft (34) from the bearing assembly (40, 52).

10. Arrangement according to claim 9, wherein the support member (52) through the

Bearing assembly (40, 52) is formed.

1 1. Arrangement according to one of the preceding claims, in which the securing member (60; 90) has at least one spring arm (82, 84, 86, 88), and in which the spring element (80) is deformed by elastic deformation of the at least one spring arm (82, 84, 86, 88) in the direction of the longitudinal axis (37) of the shaft (34) from the first state to the second state of the spring element (80) can be transferred.

12. Arrangement according to claim 1 1, wherein the at least one spring arm (82, 84, 86, 88) in the second state of the spring element (80) at least approximately parallel to the longitudinal axis (37) of the shaft (34) is aligned.

13. Arrangement according to claim 1 1 or 12, wherein the at least one

Spring arm (82, 84, 86, 88) in the first state of the spring element (80) at a predetermined angle (89) obliquely to the longitudinal axis (37) of the shaft (34) is aligned.

14. Arrangement according to one of claims 1 1 to 13, wherein the

Securing member (60; 90) has a on the shaft (34) fixed to the support member (65) on which the at least one spring arm (82, 84, 86, 88) is formed.

15. Arrangement according to claim 14, wherein the support member (65).

ring segment-shaped, in order to enable Aufklippsen the securing member (60, 90) on the shaft (34).

16. Arrangement according to one of the preceding claims, in which the

Bearing assembly (40, 52) has a sliding bearing, a rolling bearing or a sintered bearing.

17. Arrangement according to one of the preceding claims, wherein the bearing assembly (40, 52) has a first contact surface (31) and a second contact surface (33), wherein the first contact surface (31) and the second contact surface (33) relative to each other in Direction of the longitudinal axis (37) of the shaft (34) are offset and for contact with the shaft (34) are formed, and wherein the first contact surface (31) has a first opening (131) and the second contact surface (33) has a second opening (133), and wherein the shaft (34) and the securing member (60; 90) disposed on the shaft (34) are adapted to permit insertion of the shaft (34) and the shaft (34)

To allow securing member (60, 90) through both the first opening (131) and through the second opening (133).