Structure group, drive unit

Abstract

[Solution] The present invention relates to a structural group (20) having a first element (21) and a second element (22), the elements (21, 22) being fixed to each other so that they together surround a structural group interior (23), and a conductive cable (24) protruding into the structural group interior (23) through a cable passage (25) formed between the elements (21, 22). At least one of the elements (21, 22) has at least one projection (28) for forming a particulate seal (27) corresponding to the cable passage (25), the projection (28) protruding in a direction toward the other of the elements (21, 22) and for pressing the cable (24) toward the other of the elements (21, 22).

Description

[Technical Field]

[0001] The present invention relates to a structural group having a first element and a second element, which are fixed to one another so that they together surround the interior of the structural group, and a conductive cable extends into the interior of the structural group through a cable passage formed between the two elements.

[0002] The invention also relates to a drive unit having a structural group of this type. [Background technology]

[0003] Structural groups of the aforementioned type are known in the prior art. For example, Patent Document 1 discloses a structural group configured as an electronic circuit housing. The structural group includes a first element and a second element, which are fixed to each other and surround the interior of the structural group. A conductive cable passes through a cable passage formed between the two elements. Typically, the cable passage has a cross section larger than the cable guided therethrough, so the cross section of the cable passage is only partially filled by the cable. Therefore, particles can infiltrate the interior of the structural group through the cable passage, which is undesirable. To prevent particles from entering through the cable passage, the structural group described in Patent Document 1 is provided with a sealing element that is fixed to and surrounds the cable. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] US Patent Application Publication No. 2002 / 0052141 Summary of the Invention

[0005] The assembly according to the present invention is advantageous in that at least one element has at least one protrusion for forming a particle seal associated with the cable passage, the protrusion projecting toward the other element and forcing the cable toward the other element. The particle seal removes at least certain particles, e.g., particles exceeding a threshold value. According to the present invention, the particle seal is associated with the cable passage. Thus, the particle seal prevents the removed particles from entering the assembly through the cable passage. Compared to the known assembly described at the beginning, the solution according to the present invention is particularly inexpensive to implement. According to the present invention, at least one of the two elements has at least one protrusion projecting toward the other element and forcing the cable toward the other element. For example, only the first element has at least one protrusion projecting toward the second element and forcing the cable toward the second element. Alternatively, the second element has at least one protrusion projecting toward the first element and forcing the cable toward the first element. Alternatively, each of the two elements has at least one protrusion, which protrudes toward the other element and presses the cable against it. In particular, at least one of the two elements has a plurality of protrusions, which protrude toward the other element and press the cable against it. A protrusion may be understood as a structure that rises from the otherwise continuous shape of the protruding element. In a preferred form, the interior of the group has a closed structure except for the cable passage. Alternatively, in addition to the cable passage, at least one other passage is provided that connects the interior of the group with the exterior of the group. In a preferred form, the protrusion directly abuts the cable, i.e. there is a contact connection between the protrusion and the cable or its insulation.

[0006] In a preferred embodiment, the cable is configured as a flat cable. This type of cable configuration is advantageous because, when the cable is pressed against the other element, a connection is obtained between the other element and the cable over a large surface area. This results in a particularly effective particle seal. In a preferred embodiment, the width of the projection is greater than the width of the flat cable.

[0007] According to a preferred embodiment, the cable passage is defined by a passage surface of the first element and a passage surface of the second element.

[0008] In a preferred embodiment, protrusions are arranged on the passage surface of the element, which press the cable against the passage surface of the other element. With such an arrangement of protrusions, the element has protrusions in the area of ​​the cable passage. Accordingly, the cross section of the cable passage is partially filled by the cable and partially by the protrusions. This means that the free cross section of the cable passage is further reduced by the protrusions, thereby providing an effective particle seal.

[0009] According to an alternative embodiment, a protrusion is preferably arranged on the face of the element adjacent to the passage surface of the element, so as to press the cable against the face of the other element adjacent to the passage surface of the other element. Accordingly, the element has a protrusion in the area adjacent to the cable passage. In this embodiment, the particulate seal is connected upstream or downstream to the cable passage. This also results in an effective particulate seal. If the particulate seal is connected upstream to the cable passage, the particulate seal seals the cable passage from the outside of the structural group. If the particulate seal is connected downstream to the cable passage, the particulate seal seals the interior of the structural group from the cable passage.

[0010] Furthermore, combinations of the above alternative embodiments are also possible. According to another embodiment, a protrusion is arranged on the passage surface of the element so as to press the cable against the surface of the other element adjacent to the passage surface of the other element. According to another embodiment, a protrusion is arranged on the surface of the element so as to press the cable against the passage surface of the other element.

[0011] In a preferred embodiment, the protrusion is configured to be elastically deformable, which has the advantage that manufacturing tolerances on the first element and / or the second element can be compensated for by the protrusion.

[0012] Preferably, the first element is a printed circuit board. The interior of the assembly is therefore partially defined by the printed circuit board. Electronic circuit elements and conductor paths formed or arranged on the end face of the printed circuit board facing the interior of the assembly are thereby protected from particles by a particle seal. A sensor element is preferably arranged or configured on the end face of the printed circuit board facing away from the interior of the assembly. In this case, the assembly refers to a sensor device. For example, the sensor element has at least one receiving coil configured as a conductor path on the printed circuit board. Preferably, the first element configured as a printed circuit board has a protrusion. However, the first element may also be configured as a printed circuit board without the protrusion.

[0013] According to a preferred embodiment, the particle seal is configured to seal the interior of the structure against particles larger than at least the minimum spacing between adjacent conductor tracks on the printed circuit board. This type of particle seal configuration removes particles that would cause electrical shorts between the conductor tracks. In contrast, particles smaller than the minimum spacing between adjacent conductor tracks on the printed circuit board are harmless, at least in terms of causing electrical shorts.

[0014] In a preferred embodiment, the protrusion is an electrical component arranged on the printed circuit board. Such a protrusion is advantageous because it can be technically implemented particularly easily, for example, by fully automated SMD mounting methods. In a preferred embodiment, the electrical component has no function apart from the function related to the formation of the particle seal. According to a preferred embodiment, the electrical component is an electrical resistor or a capacitor.

[0015] In a preferred embodiment, the second element is a support element for supporting a printed circuit board. In a preferred embodiment, the second element configured as a support element has a protrusion. However, the second element may also be configured as a support element without the protrusion.

[0016] According to a preferred embodiment, the support element has a protrusion, and the protrusion and the base body of the support element are made of the same material. This allows for a particularly simple production of the support element with the protrusion. Preferably, the material from which the support element and the protrusion are made is plastic. Preferably, the base body of the support element and the protrusion are made integral with one another, for example by injection molding. Preferably, the thickness of the protrusion is smaller than the thickness of the base body of the support element. This allows the base body to be mechanically robust, while the protrusion can be made elastically deformable, despite the base body and the protrusion being made of the same material.

[0017] In a preferred embodiment, the support element has a protrusion, the protrusion being made of a first material and the base body of the support element being made of a second material, the modulus of elasticity of the first material being smaller than that of the second material. This also ensures a mechanically robust design of the support element and an elastically deformable design of the protrusion at the same time. Preferably, the first material and the second material are different plastics. Preferably, the base body of the support element and the protrusion are also integrally designed with one another in this embodiment, for example, the protrusion is injection-molded into the base body of the support element.

[0018] The drive according to the invention has an electric machine arranged in a housing with a rotatably supported rotor and is distinguished by the features of claim 13 according to the structural group of the invention, which also leads to the above-mentioned advantages. Further preferred features and combinations of features can be seen from the above description and the claims. In a preferred form, the structural group is arranged in the housing of the drive, in particular fixed to the housing.

[0019] In a preferred embodiment, the assembly has a sensor element, and the sensor element is used to detect the rotational position of the rotor. That is, the assembly is a sensor device. In a preferred embodiment, the sensor element is arranged or configured on an end face of the printed circuit board opposite the interior of the assembly. In a preferred embodiment, the printed circuit board is configured in the shape of a ring disk and is arranged coaxially with the drive shaft that supports the rotor. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a perspective view of a pressure generator for a braking system. [Figure 2] FIG. 2 is a cross-sectional view of a drive device for a pressure generator. [Figure 3] FIG. 2 is a detailed view of the structural group of the drive device. [Figure 4] FIG. 10 is another detailed view of the structural group. [Figure 5] FIG. 10 is a diagram showing another example of a structural group. [Figure 6] FIG. 10 is a diagram showing another example of a structural group. DETAILED DESCRIPTION OF THE INVENTION

[0021] The present invention will be explained in detail below with reference to the drawings.

[0022] FIG. 1 shows a perspective view of a pressure generator 1 for a hydraulic brake system of a motor vehicle. The pressure generator 1 has an electric drive 2. The drive 2 has a housing 3, which here has a circular cross section. The drive 2 further has an electric machine 4. The electric machine 4 is arranged in the housing 3 and is therefore not shown in FIG. 1. The pressure generator 1 has a pumping device 5 as a working machine, which includes at least one hydraulic pump. The housing 3 of the drive 2 is fixed to a housing 7 of the pumping device 5 by means of a number of fixing means 6. The drive 2 is configured to operate at least one hydraulic pump of the pumping device 5 using the electric machine 4. The pressure generator 1 further has a control unit 8 for driving and controlling the electric machine 4. The pumping device 5 is arranged between the drive 2 on the one hand and the control unit 8 on the other hand.

[0023] Figure 2 shows a cross-sectional view of the drive device 2. As can be seen from Figure 2, the drive device 2 has a drive shaft 9 which is rotatably mounted in the housing 3 about a rotation axis 10. The drive shaft 9 is operatively connected to at least one fluid pump of the pumping device 5 by a transmission 11, which is shown diagrammatically.

[0024] The electric machine 4 has a rotor 12 arranged non-rotatably relative to the drive shaft 9. The axis of rotation of the rotor 12 corresponds to the axis of rotation 10 of the drive shaft 9. The electric machine 4 further has a stator 13 arranged fixedly in the housing. The stator 13 has multi-phase motor coils, not shown for reasons of clarity, distributed around the rotor 12 so that the rotor 12 and thus the drive shaft 9 can be rotated or driven by appropriately energizing the motor coils.

[0025] The housing 3 has cup-shaped poles 14 that support the stator 13. As can be seen in FIG. 1, the cup-shaped poles 14 are cup-shaped. The housing 3 also has a bearing shield 17. The bearing shield 17 is configured to support the drive shaft 9. For this purpose, the bearing shield 17 covers the electric machine 4 and thereby forms a housing cover for the housing 3. The bearing shield 17 has an axially extending sleeve-shaped bearing section 18. A slewing bearing 19, which is a rolling element bearing in this case, is arranged between the bearing section 18 and the drive shaft 9. The bearing shield 17 also has an axially extending sleeve-shaped fixing section 16. The bearing shield 17 is fixed to the cup-shaped pole 14 by means of the fixing section 16, for example, by friction fastening, adhesive bonding, welding and / or at least one fixing means.

[0026] The drive device 2 further includes a structural group 20 arranged within the housing 3. FIGS. 3 and 4 each show a detailed view of the structural group 20. The structural group 20 includes a first element 21 and a second element 22. These elements 21, 22 are fixed to one another so that they together enclose a structural group interior 23. Here, the first element 21 and the second element 22 are fixed to one another by a locking connection. Alternatively, the elements 21 and 22 are fixed to one another by an adhesive bond. The first element 21 and the second element 22 are configured in the shape of a ring disk and are arranged coaxially with respect to the drive shaft 9.

[0027] The structural assembly 20 further includes a conductive cable 24, which extends through a cable passage 25 into the structural assembly interior 23. The cable 24 is a flat cable 24 in this example. The cable passage 25 is formed between the first element 21 and the second element 22. The cable passage 25 is defined by a passage surface 42 of the first element 21 and a passage surface 43 of the second element 22. The second element 22 has a notch 26 for forming the cable passage 25. Except for the cable passage 25, the structural assembly interior 23 is closed in this example. As can be seen from FIGS. 2, 3, and 4, the cable passage 25 has a larger cross-section than the cable 24, so that the cable 24 does not completely fill the cross-section of the cable passage 25.

[0028] A particle seal 27 is provided in the cable passage 25, sealing the interior 23 of the structural assembly against particles. A protrusion 28 is provided to form the particle seal 27. According to the embodiment shown in FIGS. 2, 3, and 4, the first element 21 has the protrusion 28. Here, the protrusion 28 is arranged on the passage surface 42 of the first element 21. The protrusion 28 protrudes from the first element 21 toward the second element 22 and presses the cable 24 against the second element 22. Alternatively, the second element 22 may have the protrusion 28, which protrudes toward the first element 21 and presses the cable 24 against the first element 21.

[0029] Here, the first element 21 is a printed circuit board 21. The structural assembly 20 is fixed to the bearing shield 17 by means of a second element 22. The structural assembly 20 is accordingly arranged fixedly on the housing. The second element 22 supports the printed circuit board 21, and therefore the second element 22 is here a carrier element 22. The carrier element 22 is made of plastic.

[0030] The printed circuit board 21 has a first end side 31 and a second end side 32. The first end side 31 faces the rotor 12 and axially faces a measurement transmitter 33 that faces the rotor 12 or is non-rotatably connected to the rotor 12. A sensor element is arranged on the first end side 31. The structural assembly 20 is configured to detect the rotational position of the rotor 12 by means of the sensor element. Accordingly, the structural assembly 20 is configured as a sensor device 20. In this case, the structural assembly 20 is configured as an inductive sensor. For this purpose, the sensor element has at least one transmitter coil and at least one receiver coil, which are configured as conductor tracks on the first end side 32 of the printed circuit board 21. The second end side 32 faces the structural assembly interior 23. An electronic circuit element 34 is arranged on the second end side 32. In this case, the electronic circuit element 34 is an application-specific integrated circuit (ASIC). The electronic circuit element 34 is configured to demodulate the sensor signal of the sensor element.

[0031] A first end section 35 of the cable 24, which extends into the structural interior 23, is electrically connected to the printed circuit board 21. A second end section 36 of the cable 24 is electrically connected to a connection device 38. If the drive device 2 is integrated into the pressure generator 1 as shown in FIG. 1, the connection device 38 is electrically connected to the control unit 8.

[0032] 2, 3 and 4, the protrusion 28 is an electrical component 28 arranged on the printed circuit board 21. The electrical component 28 is, for example, an electrical resistor 28 or a capacitor 28. In a preferred form, the electrical component 28 has no function other than that associated with the construction of the particulate seal 27.

[0033] The particle seal 27 is preferably configured to seal the structural interior 23 against particles larger than the smallest spacing between adjacent conductor tracks on the printed circuit board 21. This is achieved in particular by the dimensional design of the protrusions 28. As can be seen in FIG. 4, the width B of the protrusions 28 is slightly smaller than the width B' of the cable passage 25. The free cross section of the cable passage 25 is therefore small enough that no particles larger than the smallest spacing between adjacent conductor tracks on the printed circuit board 21 can pass through. Here, the width B of the protrusions 28 is greater than the width B'' of the cables 24.

[0034] FIG. 5 shows a structural group 20 according to another embodiment. The embodiment shown in FIG. 5 differs from the embodiments shown in FIGS. 2, 3, and 4 mainly with regard to the configuration of the protrusions 28. In the embodiment shown in FIG. 5, the support element 22 has the protrusions 28. The protrusions 28 are arranged on a base body 40 of the support element 22. The base body 40 and the protrusions 28 are configured together as an injection-molded part. The protrusions 28 and the base body 40 are made of the same material or plastic. To enhance the elastic deformation of the protrusions 28, the protrusions 28 have a smaller thickness than the base body 40. The protrusions 28 protrude toward the printed circuit board 21 and press the cables 24 toward the second end face 25 of the printed circuit board 21. Thus, a force acts on the protrusions 28, causing them to elastically deform. Here, the protrusions 28 are arranged on a passage surface 43 of the support element 22 and press the cables 24 toward a passage surface 42 of the printed circuit board 21.

[0035] FIG. 6 shows a structural group 20 according to another embodiment. The embodiment shown in FIG. 6 differs from the embodiment shown in FIG. 5 with regard to the configuration of the protrusions 28. In the embodiment shown in FIG. 6, the support element 22 also has protrusions 28 that protrude toward the printed circuit board 21 and press the cable 24 against the printed circuit board 21. However, in the embodiment shown in FIG. 6, the base body 40 and the protrusions 28 are made of different plastics. The protrusions 28 are made of a first plastic. The base body 40 is made of a second plastic. To increase the elastic deformability of the protrusions 28, the modulus of elasticity of the first plastic is smaller than the modulus of elasticity of the second plastic. Preferably, the protrusions 28 are injection-molded into the base body 40. [Explanation of symbols]

[0036] 1 pressure generator 2 Electric drive unit 3. Housing 4 Electrical Machinery 5. Pumping equipment 6 Fixing means 7. Housing 8 Control Unit 9 Drive shaft 10 Rotation axis 11 Transmission 12 rotor 13 Stator 14 Cup-shaped pole 16 Fixed Section 17 Bearing shield 18 Bearing Section 19 Slewing bearings, rolling element bearings 20 Structure group, sensor device 21 First element, printed circuit board 22 Second element, support element 23 Inside the structure group 24 Conductive cable, flat cable 25 Cable passage 26 Notch 27 Particulate seal 28 Protrusions, electrical components, electrical resistors, capacitors 31 First end face side 32 Second end face side 33 Measurement Transmitter 34 Electronic circuit elements 35 First End Section 36 Second End Section 38 Connection Device 40 Base 42,43 Passage surface B,B',B'' width

Claims

1. A drive device having an electric machine (4) arranged in a housing (3) with a rotatably supported rotor (12), The drive device includes a bearing shield (17) that supports a drive shaft (9) of the rotor (12), and a structural group (20) that is disposed within the housing (3) and is coaxial with the drive shaft (9), The structural group (20) has a first element (21) and a second element (22) that fixes the first element and the bearing shield (17), the first element (21) and the second element (22) are fixed to each other so as to surround an interior (23) of the structural group together, and a conductive cable (24) passes through a cable passage (25) formed between the first element (21) and the second element (22) and enters the interior (23) of the structural group, a drive device characterized in that at least one of the elements (21, 22) has at least one protrusion (28) for forming a particulate seal (27) corresponding to the cable passage (25), the protrusion (28) protruding in a direction toward the other of the elements (21, 22) and pressing the conductive cable (24) toward the other of the elements (21, 22).

2. 2. The drive device according to claim 1, wherein the conductive cable (24) is configured as a flat cable (24).

3. 2. The drive device according to claim 1, wherein the cable passage (25) is defined by a passage surface (42) of the first element (21) and a passage surface (43) of the second element (22).

4. 4. The drive device according to claim 3, wherein the protrusion (28) is arranged on the passage surface (42, 43) of the element (21, 22) and presses the conductive cable (24) against the passage surface (42, 43) of the other element (21, 22).

5. 4. The drive device according to claim 3, wherein the protrusion (28) is arranged on a surface of the element (21, 22) adjacent to the passage surface (42, 43) of the element (21, 22) and presses the conductive cable (24) against a surface of the other element (21, 22) adjacent to the passage surface (42, 43) of the other element (21, 22).

6. 2. The drive device according to claim 1, wherein the projection (28) is configured to be elastically deformable.

7. 7. Drive device according to claim 1, characterized in that the first element (21) is a printed circuit board (21).

8. 8. The drive device according to claim 7, wherein the particle seal (27) is configured to seal the interior of the structural group (23) against particles larger than at least the minimum spacing between adjacent conductor paths of the printed circuit board (21).

9. 8. The drive device according to claim 7, wherein the protrusion (28) is an electric component (28) arranged on the printed circuit board (21).

10. 8. The drive device according to claim 7, characterized in that the second element (22) is a support element (22) that supports the printed circuit board (21).

11. 11. The drive device according to claim 10, wherein the support element (22) has the projection (28), and the projection (28) and the base (40) of the support element (22) are made of the same material.

12. 11. The drive device according to claim 10, wherein the support element (22) has the protrusion (28), the protrusion (28) being made of a first material, and the base (40) of the support element (22) being made of a second material, the modulus of elasticity of the first material being smaller than the modulus of elasticity of the second material.

13. A drive device as described in any one of claims 1 to 6, characterized in that the structural group (20) has a sensor element and is configured to detect the rotational position of the rotor (12) using the sensor element.

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