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CN-122003802-A - Electric drive for a vehicle

CN122003802ACN 122003802 ACN122003802 ACN 122003802ACN-122003802-A

Abstract

The invention provides an electric drive (10) for a vehicle, comprising a housing (G) having a sensor recess (SN), an Electric Motor (EM) which comprises the housing (G) or which is arranged in the housing (G), a sensor device (S) having a clamping device (HV), wherein the sensor device (S) can be inserted into the sensor recess (SN) of the housing (G) by means of the clamping device (HV), wherein the clamping device (HV) comprises a guide region (FB) which can be positioned in the sensor recess (SN) and which comprises at least one raised region (VB) which protrudes from the outer surface of the guide region (FB) at a predetermined region of the outer surface of the guide region (FB), and wherein the guide region (FB) furthermore comprises at least one sealing element (DE) at a predetermined sealing region (DB) of the outer surface of the guide region (FB) and wherein the raised region (FB) has such dimensions that a sensor recess (SN) is present between the sensor recess (SN) and the predetermined region (FB), wherein the predetermined gap (sp) is at least partially larger than the capillary distance.

Inventors

  • P. BEAGLE
  • JOERG MARKUS

Assignees

  • 罗伯特·博世有限公司

Dates

Publication Date
20260508
Application Date
20240923
Priority Date
20231013

Claims (12)

  1. 1. An electric drive device (10) for a vehicle, comprising: -a housing (G) having a sensor recess (SN); -an Electric Motor (EM) comprising the housing (G), or the electric motor being arranged in the housing (G); -a sensor device (S) with a clamping device (HV), wherein the sensor device (S) is insertable with the clamping device (HV) into a sensor recess (SN) of the housing (G), wherein the clamping device (HV) comprises a guide region (FB) which is positionable in the sensor recess (SN) and the guide region (FB) comprises at least one raised region (VB) which protrudes from an outer surface of the guide region (FB) at a predetermined region of the outer surface, and wherein the guide region (FB) furthermore comprises at least one sealing element (DE) at a predetermined sealing region (DB) of the outer surface of the guide region (FB), and wherein the raised region (VB) is dimensioned such that, with the guide region (FB) being inserted into the sensor recess (SN), a capillary gap (at least largely prevails between the raised region (VB) and an inner wall (sp) of the sensor recess (SN) at least in a predetermined gap.
  2. 2. The electric drive (10) according to claim 1, wherein the guiding region (FB) has a circular cross section.
  3. 3. Electric drive (10) according to claim 1 or 2, wherein the predetermined sealing region (DB) is shaped as a groove in the outer surface of the guide region (FB), which groove surrounds the outer surface of the guide region (FB) and comprises a groove bottom and a groove wall, wherein the raised region (VB) abuts against the groove and forms a groove wall, and the sealing element (DE) is insertable into the groove.
  4. 4. An electric drive (10) according to any one of claims 1 to 3, wherein the sealing element (DE) is an O-ring (O1, O2).
  5. 5. An electric drive (10) according to claim 3, wherein the guiding region (FB) comprises a first O-ring (O1) and a second O-ring (O2) as sealing elements, the first O-ring and the second O-ring being arranged in two different planes at the outer surface of the guiding region (FB), and the guiding region (FB) comprises a further raised region (VB 2) located in the other plane between the first O-ring (O1) and the second O-ring (O2).
  6. 6. Electric drive (10) according to any one of claims 1 to 5, whenever claim 3 is back-referred, wherein the at least one raised area (VB 1, VB 2) has a first area (B1) with a first radius (R1) at the outside that can face the Inner Wall (IW) of the sensor recess (SN), and a second area (B2) with a second radius (R2) adjacent to the first area (B1) and adjacent to the sealing area (DB) in the axial direction of the guiding area (FB), wherein the second radius (R2) is larger than the first radius (R1).
  7. 7. The electric drive (10) according to claim 6, wherein the difference between the first radius (R1) and the second radius (R2) can be selected such that a balance between the size of the shoulder height at the raised area and the capillary action is achieved according to a predetermined.
  8. 8. The electric drive (10) according to claim 6 or 7, wherein the first region (B1) comprises a first length (h 1) in an axial direction along the guiding region (FB), and the second region (B2) comprises a second length (h 2) in an axial direction along the guiding region (FB), wherein the second length (h 2) is smaller than the first length (h 1).
  9. 9. The electric drive (10) according to any one of claims 1 to 8, wherein the sensor recess (SN) comprises at least partially a circular Inner Wall (IW) with an inner radius and in an upper region (OB) of the sensor recess (SN) adjacent to the outside of the housing (G), the inner radius increases at least partially or outwardly over the entire upper region (OB) or over the entire upper region (OB).
  10. 10. The electric drive (10) according to any one of claims 1 to 9, wherein the angle of the lead-in chamfer at the edge region above the sensor recess (SN) with respect to the central axis of the sensor recess (SN) is shaped as small as possible, preferably smaller than a predetermined value.
  11. 11. The electric drive (10) according to any one of claims 1 to 10, wherein the capillary action is reduced in case the capillary action distance for the predetermined liquid is exceeded.
  12. 12. An electric drive (10) according to any one of claims 1 to 11, wherein the raised area (VB) comprises a support element which inhibits over-centre compression of the sealing element.

Description

Electric drive for a vehicle Technical Field The present invention relates to an electric drive apparatus for a vehicle. Background In a typical electric drive, the sensor can be fixed in the housing of the electric drive shaft with a specific clamp. In a typical embodiment, the clamping elements can be made of plastic and are inserted into recesses provided in the housing of the electric drive shaft. In order to close (seal) the recess(s) against the environmental medium and to be able to fix and center the clamp(s) well in the recess, it is advantageous to have a support element and a sealing element between the clamp and the housing of the electric drive shaft. It is desirable to provide an improved seal against the housing at the edge of the clamping element. A drive train of a vehicle that can be operated in all-wheel drive is described in WO 2013/083243 A1. Disclosure of Invention The invention realizes an electric drive for a vehicle according to claim 1. Preferred developments are the subject matter of the dependent claims. The invention has the advantages. The invention is based on the idea of specifying an electric drive for a vehicle, in which the sealing properties in the clamping device for the sensor device can be improved, in which the sealing properties and the penetration of the environmental medium into the edge region can be reduced, and in which the edge design of the clamping element for the sensor device relative to the recess in the housing can be improved. According to the invention, an electric drive for a vehicle comprises a housing having a sensor recess, an electric motor which comprises the housing or which is arranged in the housing, and a sensor device having a clamping device, wherein the sensor device can be inserted into the sensor recess of the housing by means of the clamping device, wherein the clamping device comprises a guide region which can be positioned in the sensor recess and which comprises at least one projection region which protrudes from an outer surface of the guide region at a predetermined region of the outer surface, and wherein the guide region furthermore comprises at least one sealing element at a predetermined sealing region of the outer surface of the guide region, and wherein the projection region is dimensioned such that, when the guide region is inserted into the sensor recess, a predetermined gap is present between the projection region and an inner wall of the sensor recess, wherein the predetermined gap is at least partially greater than the capillary distance. The housing can be a housing of the motor or the motor can be arranged in the housing. The sensor device can be, for example, a position sensor for a sensor magnet of a rotor of an electric machine. Furthermore, an application specific integrated circuit or in general a processor device can be present, which can be arranged together with the sensor in the inner region of the holding device or at least can be wired to the sensor. The recess can be a sensor hole in the housing. The housing can be the housing of an electric drive shaft or the motor itself. According to the invention, the sealing region in the sensor recess and the guide region can advantageously be optimized with respect to its sealing effect. In this case, a releasable connection of the clamping device relative to the housing can be achieved, while sealing the engagement of the clamping device into the recess of the sensor. In the case of a clamping device which is fixed in the sensor recess only by the fastening element (for example a screw), a rotation of the clamping device about the central axis of the fastening element occurs during the screwing process. This results in an undesired eccentric compression of the sealing element in the sensor recess. This can be suppressed by the support element. The support element should be arranged in the center of the sensor recess and at right angles to the imaginary circular trajectory of the fixing process. The height of the support element should be matched to the gap created between the raised area and the sensor recess and the compression of the sealing element. In addition, durability against corrosive penetration at the mating portion can be improved. Furthermore, as low a capillary action as possible at the mating portion (raised area) with respect to the inner wall of the sensor recess can be achieved. In the case of the fitting of the guide region into the sensor recess, the sealing element can come into contact with the inner wall and be deformed for sealing. Since in such clamping devices usually small gaps between the outer geometry of the guide region and the wall of the hole do not exclude liquid ingress and transport by capillary action or even promote this in the case of small gap sizes, it is advantageously possible according to the invention that such capillary action at the raised region can be reduced or even avoided by means of the predetermined gap (which is