Electric motor with rotor shaft and housing part

Abstract

Electric motor with rotor shaft and housing part (3), wherein the rotor shaft is rotatably mounted in the housing part (3), wherein a hood, i.e. fan hood (1), is connected to the housing part (3), wherein an angle sensor has a rotatably mounted part, in particular a sensor shaft, which is mounted in a housing part (3) of the angle sensor, wherein the housing part (3) is connected to the hood by means of a torque support, wherein the hood has grid openings, wherein, as a torque support, a support part (4) connected to the housing part (3) of the angle sensor is connected to the hood by means of a connecting element (5), wherein a first section of the connecting element (5) is inserted into a grid opening and a second section is connected to the support part (4), wherein the connecting element (5) has a limiting section (90) which has a larger outer diameter than the first and / or second section, wherein the limiting section (90) is arranged between the support part (4) and the hood, wherein the support part (4) and / or the hood is made of a less elastically deformable material than the connecting element (5), wherein the support part (4) and / or hood are made of metal and the connecting element (5) is made of rubber or plastic, wherein the first section is designed outwards in the ring axis direction with a tapered cross-section and / or outer diameter, and wherein the second section is designed with a tapered cross-section and / or outer diameter towards the outside in the ring axis direction.

Description

[0001] The invention relates to an electric motor with a rotor shaft and housing part.

[0002] From DE 10 2008 021 829 A1, the closest prior art is known a torque support for fastening the housing of a rotary encoder to an electric motor, which has a rotor shaft and a housing part.

[0003] An arrangement for torque support of a rotary encoder is known from DE 299 20 785 U1.

[0004] EP 2 113 989 A1 discloses a torque support for fastening the housing of a rotary encoder to an electric motor.

[0005] A plastic plug is known from DE 19 45 642 U.

[0006] The invention is therefore based on the object of developing an electric motor, the production of which should be simple and cost-effective.

[0007] According to the invention, the object is achieved in the electric motor with rotor shaft and housing part according to the features specified in claim 1.

[0008] Important features of the invention in the electric motor with rotor shaft and housing part are that the rotor shaft is rotatably mounted in the housing part, wherein a hood, in particular a fan hood, is connected to the housing part, in particular detachably connected, wherein an angle sensor has a rotatably mounted part, in particular a sensor shaft, which is mounted in a housing part of the angle sensor, wherein the housing part is connected to the hood by means of a torque support, the hood has grille openings, wherein a support part connected to the housing part of the angle sensor, in particular detachably connected and / or screw-connected, is connected to the hood by means of a connecting element as a torque support, wherein the connecting element is inserted into a grid opening with a first section of the connecting element and is connected to the support part with a second section.

[0009] The advantage here is that the torque support comprises a connecting element which is arranged between the support part and the fan cover and thus enables vibrations and mechanical oscillations to be dampened.

[0010] In an advantageous embodiment, the connecting element is clip-connected to the support part. This is advantageous in that the connecting element can be connected to the support part in a first step during production, and then the fan cover can be pushed onto the axial end region of the motor, while the support part is elastically deflectable and the connecting element can be inserted into a grille opening. Tab sections of the support part can also be inserted into additional grille openings. This ensures that, in the event of a failure of the connecting element, the support part is supported directly in the circumferential direction by the fan grille of the fan cover.

[0011] In an advantageous embodiment, the second section has an annular recess into which the support part is held in a snap-in manner. Advantageously, the support part must have a round hole whose diameter must be equal to or slightly larger than the minimum diameter of the annular recess. The diameter of the hole is smaller than the largest outer diameter of the section adjacent to the annular recess. This enables clipping in. The adjacent area, in particular a thickened portion, acts like a locking lug. It therefore deforms as the support part is pushed past. The hole can be produced, for example, by punching.

[0012] In an advantageous embodiment, the second section is a section tapering toward an axial end region, which has an annular recess at its axially inwardly directed end region, in which the support part is held in a snap-in position. This is advantageous in that it allows for easy threading.

[0013] In an advantageous embodiment, the connecting element has a limiting section which has a larger outer diameter than the annular recess and / or than the first and / or second section, The limiting section is arranged between the support part and the cover. Advantageously, the limiting section rests against the fan grille, preventing the connecting element from passing further through a grille opening. The limiting section encompasses the largest outer diameter of the connecting element.

[0014] In an advantageous embodiment, the support part and / or the cover are made of a less elastically deformable material than the connecting element, in particular with the support part and / or cover being made of metal and the connecting element being made of rubber or plastic, in particular NBR or EPDM. This is advantageous because it makes it easy to dampen mechanical vibrations. The dissipation in the material of the connecting element is greater than in the support part and the fan cover.

[0015] In an advantageous embodiment, the boundary section and / or the first section has a polygonal, in particular triangular, quadrangular or hexagonal, in particular regularly polygonal, in particular square, cross-section with rounded corners and / or The boundary section and / or the first section has a polygonal, in particular regular polygonal, cross-section with rounded corners, in particular wherein the normal direction of the section plane is aligned parallel to the axial direction and / or the direction of the ring axis. It is advantageous that the grille openings can be designed in a correspondingly polygonal manner. This enables simple production and a relatively low resistance to the air flowing towards the fan. Alternatively, circular grille openings can also be designed, in which case the connecting element then has circular sections, in particular a first, second section and boundary section, instead of the polygonal sections.

[0016] In an advantageous embodiment, the second section has a circular cross-section, in particular with the normal direction of the cutting plane aligned parallel to the axial direction and / or the direction of the ring axis. This advantageously allows only a simple circular hole to be punched into the support part, into which the second section can be inserted.

[0017] In an advantageous embodiment, the support part has one or more tab sections, with each tab section engaging a respective grid opening. This provides increased safety. If the connecting element fails, the tab sections engage the grid openings and transmit the torque.

[0018] In an advantageous embodiment, the grid opening is polygonal, in particular regularly polygonal, in particular square, regularly hexagonal, or regularly triangular, in particular with rounded corners. This is advantageous because it allows for simple production and low flow resistance.

[0019] In an advantageous embodiment, the first section of the connecting element borders on the limiting section in the ring axis direction, to which the annular recess borders, The annular recess is arranged between the second section and the limiting section. This has the advantage that a secure fit of the connecting element against the fan grille can be ensured.

[0020] In an advantageous embodiment, the first section has a cross-section and / or outer diameter that tapers outwardly, i.e., toward an outer end region in the ring axis direction, and / or the second section has a cross-section and / or outer diameter that tapers outwardly, i.e., toward an outer end region opposite the ring axis direction. This allows for easy threading.

[0021] In an advantageous embodiment, the second section is a rotary body section, in particular a conical section. This is advantageous because it allows for simple manufacturing.

[0022] In an advantageous embodiment, the support part has further tab sections which cover a recess arranged centrally in the grille of the hood,

[0023] In particular, the recess is larger than any other mesh opening. This increases safety, as the torque support function is guaranteed in the event of a connecting element failure. Furthermore, the mesh prevents contact with rotating parts, as the mesh openings have a smaller diameter than a human finger.

[0024] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art.

[0025] The invention will now be explained in more detail with the aid of illustrations: In the Fig. 1 shows a plan view of an axial end region of a motor according to the invention, which has a torque support for an angle sensor supported on a fan cover 1. In the Fig. 2 shows a cross section through the area of ​​the torque support for an angle sensor supported on the fan cover 1. In the Fig. 3 is a cross-section through the connection area between fan cover 1 and connecting element 5. In the Fig. 4 shows an oblique view of the fan cover 1. In the Fig. 5 is an enlarged section of Fig. 4 shown.

[0026] As shown in the figures, a fan cover 1 is pushed axially onto the axial end region of a motor.

[0027] The angle sensor has a rotatably mounted part that is non-rotatably connected to the rotor of the electric motor. The rotatably mounted part of the angle sensor is mounted in a housing part 3 of the angle sensor, which is supported circumferentially on the fan cover 1 via the torque arm.

[0028] The torque support has a support part 4 which is connected to the housing part 3 in a rotationally fixed manner, in particular by screwing.

[0029] The support part 4 is preferably a sheet metal part and / or a stamped and bent part. The support part 4 has a recess extending in the axial direction, i.e., in the direction of the rotor axis, through which a section 92 of the connecting element 5 is passed and clipped into an annular recess to the support part 4. The section 92 tapers toward the outer end of the connecting element 5, i.e., has a monotonously and / or continuously decreasing diameter. A thickened portion is arranged at the inner end of the section 92, which is located between the annular recess and the thickened portion, i.e., an annular thickened portion and / or bead, and a likewise circumferentially formed limiting section 90. The limiting section has a large diameter, in particular, the largest outer diameter of the connecting element 5.On the side of the connecting element facing away from the section 92, a section 91 is arranged which is also tapered outwards and is inserted into a grille opening of the fan grille 2 of the fan cover 1.

[0030] Thus, the support part 4 is spaced from the fan grille 2 of the fan cover 1 by means of the limiting section 90.

[0031] The support part 4 is shaped in such a way that when the fan cover 1 is put on, the continuous recess of the support part 4, which is clip-connected to the connecting element 5, is elastically deflected by the deflection 6 and is thus connected to the fan cover 1 under prestress.

[0032] The largest outer diameter of the connecting element 5 thus increases in the axial direction of the rotor shaft. This section can also be referred to as the insertion section 92 because it facilitates threading into the continuous recess of the fan grille 2 of the fan cover 1.

[0033] The annular thickening is axially connected, to which the annular recess, which has a smaller diameter, is axially connected. This is followed by the radially further extending annular limiting section 90. This is followed axially by section 91, whose maximum outer diameter decreases with increasing distance from the limiting section 90. This makes threading into a grille opening of the fan grille 2 easy.

[0034] Section 92 can be designed as a rotary body section. Section 91, like the limiting section, is preferably adapted in cross-section to the shape of the grille opening, i.e., square with rounded corners. This allows for easy insertion into the fan grille, and the limiting section covers the grille opening, as it slightly extends beyond the grille opening in the radial direction at its periphery.

[0035] The fan grille 2 has a particularly regular grid of grille openings, wherein this fan grille 2 is arranged radially further inward than the edge of the fan cover 1, which radially surrounds and supports the fan grille.

[0036] An axially continuous recess is arranged radially in the center of the fan grille 2, which is larger than each of the grille openings of the fan grille 2. The angle sensor, in particular its housing part 3, is arranged in this continuous recess.

[0037] During production, the connecting element 5 is clipped into the axially continuous recess of the support part 4, which is preferably circular in shape, allowing the section 92 to be easily threaded in. The preload is then generated by pressing the fan cover, while simultaneously threading the connecting element with its section 91 into a grille opening, so that the limiting section 90 then rests against the fan grille 2 under preload.

[0038] Thus, a rotationally fixed connection is created in the circumferential direction between the support part 4 and the fan grille 2 of the fan cover 1, although the connecting element 5 is arranged therebetween.

[0039] The material of the connecting element 5 is more elastic than the material of the support part 4 and the fan grille 2. This allows for vibration damping. Vibration modes propagating in the circumferential and / or axial directions are damped. However, vibration modes propagating in the radial direction are also damped, since the connecting element 5 is interposed.

[0040] Vibrations are dampened particularly in the axial direction, since the connecting element 5 is not rigidly connected to the grid 2, but is only preloaded. Thus, there is a degree of freedom in the axial direction.

[0041] The connecting element 5 is preferably made of plastic or rubber. NBR or EPDM is particularly preferred. The support part 4 is made of sheet steel. The fan cover 1 can also be made of sheet steel.

[0042] The support part 4 also has tab sections 7, which each engage in a grille opening of the fan grille 2, which is closest to the grille opening into which the connecting element 5 is inserted with its section 91. The engagement of the tab sections 7 in the grille openings takes place automatically when the fan cover 1 is pushed axially onto the motor.

[0043] The tab sections 7 are bent around the base body of the support part 4 in the axial direction, in particular so that they have a bending angle of approximately 90°.

[0044] In addition, the support part 4 has additional tab sections 11 on the base body, which at least partially cover the recess arranged centrally in the fan cover 1. These additional tab sections 11, in turn, have a bending angle of approximately 90° to the tab sections 7. This ensures contact protection by preventing contact with rotating parts arranged inside the cover.

[0045] When the connecting element 5 is inserted into the support part 4, the annular thickening is elastically compressed, and then the connecting element 5 engages in the annular recess, with the annular thickening being released again. This ensures that the connecting element 5 is securely held in the support part 4. Section 91 is held in the corresponding grid opening with a force fit, whereby the material of the connecting element 5 is slightly compressed in the area of ​​the grid opening.

[0046] The connecting element 5 rests on the support part 4 and the fan grille 2 of the fan cover 1 without any play.

[0047] The fan cover 1 covers a fan that is non-rotatably connected to the rotor shaft of the electric motor. The air drawn in by the fan flows through the fan grille 2 of the fan cover 1 into the fan.

[0048] In a further embodiment of the invention, the grille openings are round, particularly circular or elliptical. This creates low airflow resistance for the air flowing into the fan. Manufacturing is also simple. The connecting element is then correspondingly round, particularly circular or elliptical. List of reference symbols 1 fan cover 2 fan grilles 3 Housing part 4 Support part, in particular torque support part 5 connecting element, 6 Deflection 7 Tab section 8 Recess, continuous 9 Thickening, in particular annular thickening and / or bulge 10 Recess 11 Tab section 90 boundary section 91 Introductory section 92 Introductory section

Claims

[1] Electric motor with rotor shaft and housing part (3), wherein the rotor shaft is rotatably mounted in the housing part (3), wherein a hood, i.e. fan hood (1), is connected to the housing part (3), wherein an angle sensor has a rotatably mounted part, in particular a sensor shaft, which is mounted in a housing part (3) of the angle sensor, wherein the housing part (3) is connected to the hood by means of a torque support, wherein the hood has grid openings, wherein, as a torque support, a support part (4) connected to the housing part (3) of the angle sensor is connected to the hood by means of a connecting element (5), wherein a first section of the connecting element (5) is inserted into a grid opening and a second section is connected to the support part (4), wherein the connecting element (5) has a limiting section (90) which has a larger outer diameter than the first and / or second section, wherein the limiting section (90) is arranged between the support part (4) and the hood, wherein the support part (4) and / or the hood is made of a less elastically deformable material than the connecting element (5), wherein the support part (4) and / or hood are made of metal and the connecting element (5) is made of rubber or plastic, wherein the first section is designed outwards in the ring axis direction with a tapered cross-section and / or outer diameter, and wherein the second section is designed with a tapered cross-section and / or outer diameter towards the outside in the ring axis direction. [2] Electric motor according to claim 1, characterized by that the connecting element (5) is clip-connected to the support part (4). [3] Electric motor according to at least one of the preceding claims, characterized by , that the second section has an annular recess into which the support part (4) is held in a snap-in manner, and / or that the second section is a section tapering towards an axial end region, which has an annular recess at its axially inwardly directed end region, in which the support part (4) is held in a latched manner. [4] Electric motor according to at least one of the preceding claims, characterized by that the connecting element (5) has a limiting section (90) which has a larger outer diameter than the annular recess. [5] Electric motor according to at least one of the preceding claims, characterized by that the connecting element (5) is made of NBR or EPDM. [6] Electric motor according to at least one of the preceding claims, characterized by , that the boundary section (90) and / or the first section has a polygonal cross-section with rounded corners and / or that the boundary section (90) and / or the first section has a polygonal cross-section with rounded corners. [7] Electric motor according to at least one of the preceding claims, characterized by that the second section has a circular cross-section. [8] Electric motor according to at least one of the preceding claims, characterized by that the support part (4) has one or more tab sections (7, 11), wherein the respective tab section (7, 11) engages in a respective grid opening. [9] Electric motor according to at least one of the preceding claims, characterized by that the grid opening is polygonal. [10] Electric motor according to at least one of the preceding claims, characterized by, that in the ring axis direction, the first section of the connecting element (5) adjoins the limiting section (90) to which the annular recess adjoins, wherein the annular recess is arranged between the second portion and the limiting portion (90). [11] Electric motor according to at least one of the preceding claims, characterized by that the second section is a rotation body section. [12] Electric motor according to at least one of the preceding claims, characterized by that the support part (4) has further tab sections (7, 11) which cover a recess (8, 10) arranged centrally in the grille of the hood.

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