rubber tank

Abstract

A positioning device for an electric motor and a bearing housing is disclosed, wherein the electric motor comprises a rotor, a rotor shaft and a stator. The positioning device is at least partially configured from an elastic material and has an interior which is configured in a substantially pot-like manner and can be positioned in a central recess of the bearing housing for at least partially receiving a first end portion of the rotor shaft.

Description

Technical Field

[0001] The present invention relates to a positioning device for an electric motor and bearing housing, wherein the electric motor includes a rotor, a rotor shaft and a stator.

[0002] Furthermore, the present invention relates to an electric motor comprising a rotor, a rotor shaft, and a stator, wherein the electric motor can be connected to a bearing housing. Background Technology

[0003] Modern mechanical tools, such as hammer drills, saws, and grinders, include electric motors used as drive devices to generate torque.

[0004] Electric motors are relatively complex devices, in which many components are mounted relative to each other in a predetermined orientation.

[0005] In particular, the orientation and positioning of the rotor shaft relative to the bearing housing often proves problematic here, as the installation space in the electric motor must be limited and tight tolerances must be followed.

[0006] In addition, the construction of electric motors should be kept as simple as possible to make them low-cost and easy to assemble. Summary of the Invention

[0007] Therefore, the object of the present invention is to provide a positioning device for an electric motor and a bearing housing, and an electric motor that can solve the above-mentioned problems.

[0008] This objective is achieved through the subject matter of independent claims 1 and 6, respectively. Further advantageous embodiments of the invention are found in the corresponding dependent claims.

[0009] This objective is achieved, in particular, by a positioning device for an electric motor and bearing housing, wherein the electric motor includes a rotor, a rotor shaft, and a stator.

[0010] According to the invention, the positioning device is at least partially configured of an elastic material and has an interior, arranged in a generally canister-like manner, and can be positioned in the central recess of the bearing housing for at least partially receiving the first end of the rotor shaft. Therefore, the most accurate possible orientation and positioning of the rotor shaft relative to the bearing housing can be achieved in a simple manner.

[0011] According to an advantageous embodiment of the invention, at least one retaining device may be included for receiving and holding a bearing for a first end of the rotor shaft. Therefore, the orientation and positioning of the rotor shaft relative to the bearing housing can be further improved. The retaining device may include clamping surfaces on its laterally inner surfaces and / or stop elements in the axial direction.

[0012] According to a further advantageous embodiment of the invention, at least one holding device may be included for receiving and holding the Hall plate. Therefore, the Hall plate can be releasably connected to the device, and precise positioning and predetermined orientation of the Hall plate relative to the rotor can be achieved. The holding device may include a first protrusion and / or a second protrusion in the axial direction, wherein the first and second protrusions may have different axial lengths.

[0013] According to a further advantageous embodiment of the invention, an axially extending gap may be included on the outer surface for at least partially receiving and holding the wiring when the positioning device is in the central recess of the bearing housing. Thus, the effect achieved is that the wiring is guided at a predetermined point, preventing it from unintentionally getting stuck between components.

[0014] According to a further advantageous embodiment of the invention, a dust cap may be included at the first end of the positioning device. Therefore, dust or other contaminants can be prevented from entering the interior of the electric motor in a simple manner.

[0015] Alternatively, this can be achieved by an electric motor comprising a rotor, a rotor shaft, and a stator, wherein the electric motor can be connected to a bearing housing.

[0016] According to the invention, a positioning device is configured to be at least partially made of an elastic material and having an interior, configured in a generally canister-like manner, and positioned in a central recess of a bearing housing for at least partially receiving a first end of the rotor shaft.

[0017] Further advantages will become apparent from the following description of the accompanying drawings, which illustrate various exemplary embodiments of the invention. The drawings, description, and claims contain numerous combinations of features. Those skilled in the art will also readily consider these features individually and combine them to form further useful combinations. Attached Figure Description

[0018] In the attached diagram:

[0019] Figure 1 A cross-section of an electric motor is shown, including the stator, rotor, rotor shaft, bearing housing, and positioning device.

[0020] Figure 2 A perspective view of a positioning device with a bottom side and an interior is shown;

[0021] Figure 3 A perspective view of the positioning device is shown, which illustrates the top side and dust cap of the device.

[0022] Figure 4 A perspective view of the bottom side of a positioning device with a Hall plate is shown;

[0023] Figure 5 A view of a positioning device with a Hall plate, taken from below, is shown.

[0024] Figure 6 A perspective view of the positioning device is shown, showing the bottom side of the positioning device with bearings;

[0025] Figure 7 A view of a positioning device with bearings, taken from below, is shown.

[0026] Figure 8 A cross-section is shown passing through a positioning device with bearings;

[0027] Figure 9 A perspective view of a positioning device with a Hall plate and circuitry is shown;

[0028] Figure 10 A cross-sectional view of the lower end of a positioning device with a Hall plate is shown;

[0029] Figure 11 A perspective view of the top side of the positioning device in the central recess of the bearing housing is shown;

[0030] Figure 12 A cross-section of the positioning device passing through the central recess of the bearing housing is shown;

[0031] Figure 13 A detailed diagram shows a positioning device in the central recess of the bearing housing, with wiring passing through an opening in the bearing housing; and

[0032] Figure 14 A cross-section of the positioning device and the line passing through the central recess of the bearing housing is shown. Detailed Implementation

[0033] Figure 1 The first end 1a of the electric motor 1 is shown. Here, the electric motor 1 basically includes a stator 2, a rotor 3, a rotor shaft 4, a Hall plate 5, a bearing housing 6, and a positioning device 7.

[0034] The electric motor 1 can be used as a drive device for a machine tool and is primarily used to generate torque. The generated torque can be transmitted directly to the tool connected to the machine tool, or transmitted to the tool via a gear mechanism. Neither the machine tool nor the tool is shown in the figure.

[0035] The rotor 3 is rotatably fixed to the rotor shaft 4 and is located inside the stator 2, such that the first end 4a of the rotor shaft 4 protrudes from the stator 2 in direction A. Direction A is the axial direction of the electric motor 1. The second end of the rotor shaft 4 is not shown in the figure. The rotor shaft 4 is essentially designed as a cylindrical rod and is used to transmit the torque generated in the electric motor 1 to the gear mechanism. The gear mechanism is not shown in the figure.

[0036] The bearing housing 6 is configured in a generally canister shape and has a central circular clearance 6a. The bearing housing 6 serves to receive and hold the stator 2 and the rotor 3. The bearing housing 6 can then be connected to the housing of a machine tool. The machine tool is not shown in the figure.

[0037] Or as Figure 1 As shown, the stator 2 is connected to the bearing housing 6 through the first end 2a, so that the first end 4a of the rotor shaft 4 protrudes into the central recess 6a of the bearing housing 6.

[0038] Especially Figure 2 and Figure 3 As shown, the positioning device 7 is configured in a generally canister-like manner. The embodiment of the canister-like positioning device 7 shown in the figure includes a first end 7a, a second end 7b, an inner surface 7c, an outer surface 7d, an upper annular element 8a, a lower annular element 8b, and six support elements 9.

[0039] The positioning device 7 is made of an elastic material. For example, the elastic material could be rubber.

[0040] Positioning device 7 can also be called a rubber tank.

[0041] Six support elements 9 are arranged in a circular pattern at regular intervals, and the lower annular element 8b is connected to the upper annular element 8a. The upper annular element 8a is located at the first end 7a of the positioning device 7, and the lower annular element 8b is located at the second end 7b. The diameter of the lower annular element 8b is larger than the diameter of the upper annular element 8a. Therefore, the positioning device 7 is conical or truncated cone in shape.

[0042] According to alternative embodiments, more or fewer than six support elements 9 may be included. Alternatively, instead of individual support elements 9, a continuous lateral surface may be included. Each support element 9 includes an upper end 9a and a lower end 9b. The upper end 9a of each support element 9 is securely connected to an upper annular element 8a, and the lower end 9b of each support element 9 is further securely connected to a lower annular element 8b. The support elements 9 extend in direction A. Corresponding openings are provided between the various support elements 9. Five of the six support elements 9 are configured in substantially the same manner. As will be described in detail later, one of the six support elements 9 includes an axially extending recess 10 on its outer lateral surface for receiving and holding the line 11. The axially extending recess 10 may also be referred to as a notch or groove. The line 11 may further be referred to as a stranded wire and connects the Hall plate 5 to the control device of an electric motor 1 or a machine tool. The Hall plate 5 includes three Hall sensors 12 on its bottom side 5a, see [link to Hall plate 5]. Figure 4 Hall sensor 12 is used to sense the position of rotor 3 relative to stator 2. The position data sensed by Hall sensor 12 can be transmitted from Hall plate 5 to control device via line 11. Control device is not shown in the figures.

[0043] like Figure 1 As can be seen, the lower annular element 7b includes a holding device 13 for receiving and holding the Hall plate 5. The Hall plate 5 is a plate (also referred to as a printed circuit board) having a plurality of Hall sensors 12. The holding device 13 shown in this exemplary embodiment includes two high fixing elements 14 and four low directional elements 15. The fixing elements 14 and the directional elements 15 are positioned relative to each other. Here, the height of the low directional elements 15 is less than half the height of the high protrusions 14. Each of the protrusions extends along direction A.

[0044] like Figure 4 and Figure 5 As can be seen, the annular Hall plate 5 has two gaps 16 opposite to each other. Two fixing elements 14 are guided through the two recesses 16, so that the Hall plate 5 is releasably connected to the lower annular element 8b. Since the positioning device 7 is made of an elastic material, the two fixing elements 14 can elastically deform to be introduced into the gaps 16. Four directional elements 15 protrude into the correspondingly shaped gaps 16 in the Hall plate 5, see [reference needed]. Figure 10 .

[0045] like Figure 2As shown, the positioning device 7 includes a fixing device 17 on its inner surface 7c for receiving and holding a bearing 18 for the first end 4a of the rotor shaft 4. In this exemplary embodiment, the bearing 18 is configured as a ball bearing. The fixing device 17 includes six protrusions 17a and six positioning surfaces 17b. Here, each support element 9 includes a protrusion 17a and a positioning surface 17b. The protrusions 17a may also be referred to as ridges. Each of the lugs 17a includes a support surface. The positioning surfaces 17b are positioned in direction B above each protrusion 17a on the inner surface 7c.

[0046] When the bearing 18 is positioned within the interior IR of the positioning device 7, the bearing 18 rests on each of the protrusions 17a along direction A and is supported against each of the positioning surfaces 17b. See [reference needed] Figure 6 and Figure 8 Because the positioning device 7 is configured elastically, when the bearing 18 is inserted into the interior IR of the positioning device 7, the support element 9 undergoes slight elastic deformation in the radial direction C. Figure 8 As shown, the bearing 18 is displaced in region D on the inner side of the positioning device 7 towards the surface 7c. In other words, in region D, the material of the positioning device 7 is elastically deformed or compressed. Due to the elastic deformation of the support element 9, the bearing 18 is relatively firmly or immovably positioned in the positioning device 7.

[0047] A circular dust cap 19 is included at the first end 7a of the positioning device 7. The dust cap 19 closes the central opening of the upper annular element 8a, thereby protecting the interior IR of the positioning device 7 from the intrusion of dust and other contaminants along direction B.

[0048] As mentioned above, one of the six support elements 9 has an axially extending gap 10 on the outer side wall for receiving and holding the line 11. Figure 3 As can be seen, the lower annular element 8b includes a gap 20. The gap 20 on the lower annular element 8b is positioned along direction B below the gap 10 on the support element 9. The gap 20 on the lower annular element 8b is used to receive the plug 21 at the end of the line 11 connecting the Hall plate 5 to the control device, see [reference needed]. Figure 4 .

[0049] Figure 1 A sub-region of the electric motor in its assembled state is shown. The rotor shaft 4 is rotatably fixed to the rotor 3. The rotor 3 and rotor shaft 4 are rotatably positioned within the stator 2. As described above, the bearing 18 is located within the internal IR of the positioning device 7, see [link to description]. Figure 8 The positioning device 7 is positioned within the bearing housing 18 such that the first end of the rotor shaft 4 protrudes into the interior IR of the positioning device 7, and the first end 4a of the rotor shaft 4 is supported in the bearing 18. See [reference needed]. Figure 1 The dust cap 19 at the first end 7a of the positioning device 7 protrudes slightly beyond the bearing housing 6 in direction A, see [reference]. Figure 14 .

[0050] Line 11 is connected to plug 21 at one end. For example... Figure 9 As shown, plug 21 is inserted into Hall plate 5. Therefore, plug 21 is located within the gap of lower annular element 8b. Line 11 extends from plug 21 in direction A, such that line 11 is located in the gap 10 formed as a groove on support element 9. Since line 11 is located in the axially extending recess 10, the outer diameter of positioning device 7 does not increase due to line support abutting against the outer surface.

[0051] When the positioning device 7 and the wiring 11 are positioned together in the bearing housing 6, the wiring 11 is assembled between the bearing housing 6 and the positioning device 7. See [reference needed]. Figure 14 Therefore, the line 11 is clamped between the bearing housing 6 and the positioning device 7 in a relatively stable or fixed manner, thereby preventing the line 11 from moving unintentionally or even falling off the Hall plate 5.

[0052] In addition, bearing housing 6 includes an additional opening 22 on the top side, see Figure 11 The opening 22 is used to guide the line 11 out of the bearing housing 6 via the positioning device 7 located in the bearing housing 6. Here, the diameter of the opening 22 corresponds to the diameter of the line 11, so that the line 11 can close the opening 22 to prevent dust from entering. In addition, the line 11 is held or supported by the opening 22 in the bearing housing 6 and / or the stator 2.

[0053] According to an alternative exemplary embodiment, the positioning device 7 may be partially made of an elastic material. For example, only the support element 9 or the upper annular element 8a and / or the lower annular element 8b may be made of an elastic material.

[0054] List of reference numerals

[0055] 1. Electric motor

[0056] 2. Stator

[0057] 3 rotors

[0058] 4. Rotor shaft

[0059] 5. Hall effect plate

[0060] 6 bearing housings

[0061] 7. Positioning equipment

[0062] 7a The first end of the positioning device

[0063] 7b The second end of the positioning device

[0064] 7c Inner surface of positioning device

[0065] Outer surface of 7D positioning device

[0066] 8a Upper ring element

[0067] 8b Lower ring element

[0068] 9 Supporting elements

[0069] 10. Gap on the outer surface

[0070] Line 11

[0071] 12 Hall Sensors

[0072] 13 Holding device

[0073] 14 Fixing elements

[0074] 15 Orientation Components

[0075] 16. Gap on the Hall plate

[0076] 17 Fixing device

[0077] 17a Protrusion on the fixing device

[0078] 17b Positioning surface on the fixing device

[0079] 18 bearings

[0080] 19. Dust cap

[0081] 20. Gap on the lower ring element

[0082] 21 plug

[0083] 22. Opening on the bearing housing

[0084] The area where the material of the positioning device undergoes elastic deformation.

[0085] The interior of an IR positioning device

Claims

1. A positioning device (7) for an electric motor (1) and for a bearing seat (6), wherein the electric motor (1) comprises a rotor (3), a rotor shaft (4) and a stator (2), wherein the positioning device (7) is at least partially configured from an elastic material and has an interior (IR), is configured in a substantially pot-like manner and is positionable in a central recess (6a) of the bearing seat (6) for at least partially receiving a first end portion (4a) of the rotor shaft (4), characterized in that the positioning device (7) comprises a first end portion (7a), a second end portion (7b), an inner lateral surface (7c), an outer lateral surface (7d), an upper annular element (8a), a lower annular element (8b) and at least two support elements (9), each support element (9) comprising an upper end portion and a lower end portion, wherein the upper end portion of each support element (9) is firmly connected to the upper annular element (8a) and the lower end portion of each support element (9) is firmly connected to the lower annular element (8b) and wherein a dust cap (19) is comprised at the first end portion of the positioning device (7), wherein an axially extending gap (10) is comprised on the outer lateral surface (7d) for at least partially receiving and holding a line (11) when the positioning device (7) is in the central recess (6a) of the bearing seat (6), wherein the line (11) connects a Hall plate (5) releasably connected to the lower annular element (8b) to a control device of the electric motor (1).

2. The positioning device (7) according to claim 1, characterized in that comprising at least one fixing device (17) for receiving and holding a bearing (18) for the first end portion (4a) of the rotor shaft (4).

3. The positioning device (7) according to claim 1 or 2, characterized in that comprising at least one holding device (13) for receiving and holding the Hall plate (5).

4. An electric motor (1) comprising a rotor (3), a rotor shaft (4), a stator (2) and a positioning device (7) according to any one of claims 1 to 3, wherein the electric motor (1) is connectable to a bearing seat (6).

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