Electric drive for vehicle
By designing a clamping device with a raised area and a predetermined gap in the electric drive unit, combined with support elements, the problem of insufficient sealing between the sensor clamp and the housing is solved, achieving higher sealing durability and corrosion resistance, and ensuring stable operation of the sensor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ROBERT BOSCH GMBH
- Filing Date
- 2024-09-23
- Publication Date
- 2026-05-08
AI Technical Summary
In existing electric drive devices, the sealing between the sensor clamp and the housing is insufficient, which makes it easy for environmental media to enter. Furthermore, the clamp is prone to eccentric compression during the fixing process, affecting the sealing effect and durability.
Design a clamping device including a guide region and a sealing element. The guide region has a raised area and a predetermined gap. There is a gap between the raised area and the inner wall of the sensor recess that is greater than the capillary action distance. Combined with a support element, the sealing element is prevented from being eccentrically squeezed. The geometry of the sealing region is optimized to reduce capillary action.
It improves the sealing performance between the sensor clamp and the housing, reduces the intrusion of environmental media, enhances the durability and corrosion resistance of the seal, reduces the wear and aging of the sealing elements, and ensures the stable operation of the sensor.
Smart Images
Figure CN122003802A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to an electric drive device for vehicles. Background Technology
[0002] In typical electric drive devices, sensors are secured to the housing of the electric drive shaft using specific clamping devices. In typical designs, these clamping devices are made of plastic and are fitted into recesses within the housing of the electric drive shaft.
[0003] In order to seal (ensure) the recess(s) against the environmental medium, and in order to secure and center (one or more) clamps(s) well in the recess, a support element and a sealing element between the clamps and the housing of the electric drive shaft are beneficial.
[0004] What is anticipated here is an improved seal relative to the housing at the edge of the clamping element.
[0005] A drive system for a vehicle capable of all-wheel drive is described in WO 2013 / 083243 A1. Summary of the Invention
[0006] The present invention provides an electric drive device for a vehicle according to claim 1.
[0007] The preferred improvement is the subject of the dependent claims.
[0008] Advantages of the present invention.
[0009] The present invention is based on the concept of an electric drive device for a vehicle, wherein the sealing characteristics of the clamping device for a sensor device can be improved, wherein the sealing characteristics and the reduction of environmental media intrusion into the edge region can improve the edge design of the clamping member for the sensor device relative to the recess in the housing.
[0010] According to the present invention, an electric drive device for a vehicle includes: a housing having a sensor recess; a motor, the motor being included in the housing, or the motor being disposed in the housing; and a sensor device with a clamping device, wherein the sensor device is capable of being inserted into the sensor recess of the housing by means of the clamping device, wherein the clamping device includes a guide region capable of being positioned in the sensor recess, and the guide region includes at least one protruding region protruding from a predetermined area on the outer surface of the guide region, and wherein the guide region further includes at least one sealing element at a predetermined sealing area on the outer surface of the guide region, and wherein the protruding region is sized such that, when the guide region is inserted into the sensor recess, a predetermined gap exists between the protruding region and the inner wall of the sensor recess, wherein the predetermined gap is at least partially greater than a capillary action distance.
[0011] The housing can be the housing of the motor, or the motor can be housed in the housing.
[0012] The sensor device can be, for example, a position sensor for the rotor magnet of a motor. Furthermore, an application-specific integrated circuit (ASIC) or, generally, a processor device, can be present, which can be arranged together with the sensor in the internal area of the clamping device, or at least wired to the sensor. The notch can be a sensor hole in the housing.
[0013] The housing can be the housing of the electric drive shaft or the motor itself.
[0014] According to the present invention, the sealing area in the sensor recess and guide region can be advantageously optimized with respect to its sealing function.
[0015] Here, a releasable connection between the clamping device and the housing can be achieved, while simultaneously sealing the mating part of the clamping device into the sensor recess.
[0016] When the clamping device is secured in the sensor recess solely by a fastening element (e.g., a screw), rotation of the clamping device about the central axis of the fastening element occurs during tightening. This results in undesirable eccentric compression of the sealing element within the sensor recess. This can be suppressed by a support element. The support element should be positioned at the center of the sensor recess and perpendicular to the imaginary circular path of the fixing process.
[0017] The height of the support element should be matched with the gap between the raised area and the sensor recess, as well as the compression of the sealing element.
[0018] Furthermore, it improves the durability of the mating portion against corrosive penetration. Additionally, it minimizes capillary action at the mating portion (protruding area) relative to the inner wall of the sensor recess. When the guide region is fitted into the sensor recess, the sealing element can contact the inner wall and deform for sealing. Since in such clamping devices, the small gap between the outer geometry of the guide region and the orifice wall typically cannot prevent liquid entry and transport via capillary action, or even promotes this phenomenon with small gap sizes, according to the invention, it is advantageous to reduce or even avoid such capillary action at the protruding area by means of the predetermined gap (which is at least locally larger than the capillary action distance). For this purpose, the predetermined gap can be designed to be as large as possible in the guide region of the mating portion. Here, for example, because a centering element needs to be placed on the outside of the guide region (towards the inner wall, for example, to suppress tilting), a smaller gap may remain locally. Furthermore, by means of a small gap (e.g., in the second region of the protruding area in the pushing direction of the guide region), it is possible to prevent the sealing element from clamping into the middle region, or to reduce its danger. The largest possible spacing between sealing elements (in the case of multiple sealing elements, such as O-rings) can reduce or prevent liquid buildup and transport. Therefore, this spacing can be provided in the most possible way given the available structural space.
[0019] The predetermined gap and the minimum height of the raised area (in the second region) can depend on the type and geometry of the sealing element. In particular, the predetermined gap should be designed to be small enough that the sealing element is not pressed into the predetermined gap, or at least its probability is reduced, when the guide area is assembled in the sensor recess. However, for this purpose, the minimum height of the raised area should be chosen such that capillary action that may occur in the second region is minimized.
[0020] Therefore, the first area should be designed to be relatively long, especially to better support the inclination of the guiding area.
[0021] A larger sealing element cross-section is advantageous for achieving the largest possible predetermined gap. However, since the sealing element cross-section cannot be arbitrarily increased (due to structural space, material usage, and cost), the largest possible sealing element cross-section should be achieved while taking into account structural space and cost.
[0022] The increased compression of the sealing element during insertion can lead to a wider abutment surface not only in the sealing area but also on the inner wall, and thus an increase in the seal penetration length (corrosion path). It is important to balance the compression of the sealing element with respect to the material aging caused by compression-deformation residues, and it is desirable to maintain the lowest possible assembly force, and to ensure that the compression and dimensions are appropriately matched.
[0023] Therefore, a large sealing element cross-section determines a large contact surface, but also requires a large recess in the sealing area. With tolerances predetermined, this dimensional design can be adapted to an acceptable consensus based on pre-defined dimensions.
[0024] The corresponding dimensions and depths and radii of the sealing elements and sealing areas are designed to be compatible with acceptable dimensions.
[0025] A large sealing element cross-section facilitates different thermal expansion of the bottom of the sealing element, the mating part, and the sealing element itself (ensuring thermal tolerance compensation while ensuring clamping force).
[0026] The large cross-section of the sealing element also results in an increased contact area between the sealing element and the mating part (sensor recess), and between the sealing element and the contact surface (bottom of the groove) at the guide area, and thus leads to a predictably increased corrosion path.
[0027] According to a preferred embodiment of the electric drive device, the guide region has a circular cross-section.
[0028] A circular cross-section can be inserted into a borehole for the sensor area. The sensor device can function as a rotational position sensor for a motor.
[0029] The described sensor device with clamping equipment can also be provided along with all the accessories without relying on an electric drive device.
[0030] In a preferred embodiment of the electric drive device, the sealing element is an O-ring.
[0031] According to a preferred embodiment of the electric drive device, the guide region includes a first O-ring and a second O-ring as sealing elements, which are arranged in two different planes on the outer surface of the guide region, and the guide region includes an additional raised region located in another plane between the first O-ring and the second O-ring.
[0032] According to a preferred embodiment of the electric drive device, the at least one protruding region includes a first region with a first radius on the outer side of the inner wall of the sensor recess, and a second region with a second radius adjacent to the first region and adjacent to the sealing region in the axial direction of the guide region, wherein the second radius is greater than the first radius.
[0033] According to a preferred embodiment of the electric drive device, the difference between the first radius and the second radius can be selected such that a balance is achieved between the shoulder height at the protruding region and the capillary action, based on a predetermined value.
[0034] The difference between two radii can, for example, be within the range of millimeters; however, other size ranges and corresponding scaling of the remaining sizes are also possible.
[0035] According to a preferred embodiment of the electric drive device, the first region includes a first length in the axial direction along the guide region, and the second region includes a second length in the axial direction along the guide region, wherein the second length is less than the first length.
[0036] According to a preferred embodiment of the electric drive device, the sensor recess at least partially includes a circular inner wall having an inner radius, and in the upper region of the sensor recess adjacent to the outer side of the housing, the inner radius increases outward at least partially or over the entire upper region (introducing a chamfer).
[0037] To achieve the desired, lowest possible assembly force, the angle of the introduced chamfer (at the edge region above the sensor recess) relative to the central axis of the recess should be chosen to be as small as possible, preferably smaller than a predetermined value.
[0038] According to a preferred embodiment of the electric drive device, capillary action is reduced when the capillary action distance for a predetermined liquid is exceeded.
[0039] The capillary action distance can be, for example, 0.5 mm, 1 mm, or even 1.5 mm.
[0040] According to a preferred embodiment of the electric drive device, the raised area can include a support element, such as a plate on the outside of the raised area, and thus facing the wall of the sensor recess when inserted. This support element can suppress the eccentric compression of multiple sealing elements or a single sealing element when the guide area is inserted into the sensor recess.
[0041] According to a preferred embodiment of the electric drive device, a predetermined sealing area is formed as a groove in the outer surface of the guide area, the groove surrounding the outer surface of the guide area and including a groove bottom and a groove wall, wherein a raised area abuts against the groove and forms a groove wall, and a sealing element can be inserted into the groove.
[0042] Further features and advantages of embodiments of the present invention will become apparent from the following description with reference to the accompanying drawings. Attached Figure Description
[0043] The invention will now be explained in more detail with reference to the embodiments shown in the accompanying drawings.
[0044] Figure 1 A schematic diagram of a clamping device for a sensor device in an electrically driven device according to an embodiment of the present invention is shown. Figure 2 Another diagram illustrates the following: Figure 1 An embodiment of the clamping device for a sensor device in an electrically driven device. Detailed Implementation
[0045] In the figures, the same reference numerals refer to the same or functionally identical elements.
[0046] Figure 1 A schematic diagram of a clamping device for a sensor device in an electrically driven device according to an embodiment of the present invention is shown.
[0047] according to Figure 1 An electric drive unit 10 for a vehicle includes: a housing G having a sensor recess SN; a motor (not shown) disposed in the housing; and a sensor device (not shown) with a clamping device HV, wherein the sensor device is capable of being inserted into the sensor recess SN of the housing G by means of the clamping device HV, wherein the clamping device HV includes a guide region FB, the guide region being capable of being positioned in the sensor recess SN, and the guide region FB including raised regions VB1 and VB2, the raised regions protruding (radially) from the outer surface of the guide region FB at a predetermined area on the outer surface of the guide region FB, and wherein the guide region FB further includes a sealing element at a predetermined sealing area on the outer surface of the guide region FB, and wherein each raised region VB1, VB2 is sized such that, when the guide region FB is inserted into the sensor recess SN, a predetermined gap sp exists between the raised regions VB1, VB2 and the inner wall IW of the sensor recess SN (e.g., in...). Figure 2 (As also shown in the diagram), where the predetermined gap sp is at least locally larger than, for example, the capillary action distance in the first region B1 of the raised region VB. Figure 1 The image specifically shows the first raised region VB1 and the second raised region VB2 (which may be the same or different). The guide region FB can here have a circular cross-section. Figure 1 (Side sectional view in the image). The sealing element here can have a first O-ring O1 and a second O-ring O2, which are arranged in two different planes on the outer surface of the guide region FB, and a second raised region VB2 can be located on another plane between the first O-ring O1 and the second O-ring O2. The corresponding raised region can extend radially beyond the abutting groove.
[0048] Furthermore, the first protruding region VB1 and the second protruding region VB2 each have a first region B1 with a first radius R1 located on the outer side of the inner wall IW facing the sensor recess SN, and a second region B2 with a second radius R2 located adjacent to the first region B1 in the axial direction of the guide region FB and adjacent to the sealing region DB1 in the pushing direction, wherein the second radius R2 is larger than the first radius R1. The corresponding radius is described here... Figure 2 As shown in the diagram. The sealing area is generally marked as DB, but the first and second sealing areas can also be referred to synonymously. In this way, the first raised area VB1 can be labeled with the additional mark "-1" for the first and second areas (i.e., B1-1, B2-1), and the second raised area VB2 can be labeled with the additional mark "-2" for the first and second areas (B1-2, B2-2).
[0049] In the region above the sensor recess SN, it can have a widened portion OB to reduce or prevent capillary action from liquid intrusion into the gap between the inserted guide region FB and the inner wall IW. The guide region FB can have a narrowed portion V in its lower (front) region.
[0050] Since the radius R2 in region B2 is greater than the radius R1 in region B1, it is possible to prevent, or at least make it less likely, for the sealing element to be clamped into the gap during assembly.
[0051] Figure 2 Another diagram illustrates the following: Figure 1 An embodiment of the clamping device for a sensor device in an electrically driven device.
[0052] Figure 2 The text shows the relationship with... Figure 1Similar illustrations are provided, along with exemplary specifications of the dimensions of the corresponding areas and components. It can be seen that there is a difference between the first radius R1 and the second radius R2; for example, twice the first radius (diameter) (the radius is seen from the central axis of the guide region) is 0.3 mm smaller than twice the second radius R2 (diameter). Here, the first diameter (twice the first radius R1) can be equal to 37.4 mm, and the second diameter (twice the second radius R2) can be equal to 37.7 mm. In the sealing region DB, the diameter of the guide region can be, for example, 34.6 mm, and an O-ring is inserted here. The inner wall IW can have an inner diameter R-IW of 38.0 mm. The center points of the two O-rings can be spaced 5.9 mm apart. The center point of the upper (first) O-ring O1 can be spaced 4.8 mm from the upper side of the first protrusion region, and when the guide region is inserted into the sensor recess SN, the upper side of the first protrusion region can be spaced 3.5 mm from the upper side of the housing. In this upper region, the sensor notch can be widened, and the guide area can have an upper diameter FB-O of 35.4 mm. According to... Figure 2 In the attached diagram on the right, the second length h2-1 of the first raised region VB1 can, for example, be equal to the second length h2-2 of the second raised region VB2, for example, 0.8 mm, but alternatively, they can be different from each other. The corresponding first lengths h1-1 and h1-2 can be the same or different; for example, the sum of h1-1 + h2-1 in the first raised region VB1 can be equal to 3.0 mm, and the sum of h1-2 + h2-2 in the second raised region VB2 can be equal to 2.3 mm. The undeformed (uninserted O-ring) can each have a diameter of, for example, 2.3 mm and be elastic. The length of one of the two sealing regions DB can, for example, be 3.6 mm.
[0053] The numerical values and corresponding orders of magnitude of the millimeter range mentioned in this and other embodiments are merely exemplary, as other size ranges and corresponding scaling of sizes are also possible, such as in the centimeter range.
[0054] Although the invention has been fully described above with reference to preferred embodiments, the invention is not limited thereto, but can be modified in a variety of ways and methods.
Claims
1. An electric drive unit (10) for a vehicle, comprising: - Housing (G) with sensor notch (SN); - An electric motor (EM), the electric motor including the housing (G), or the electric motor disposed in the housing (G); - A sensor device (S) with a clamping device (HV), wherein the sensor device (S) is capable of being inserted into a sensor recess (SN) of a housing (G) by means of the clamping device (HV), wherein the clamping device (HV) includes a guide region (FB) capable of being positioned in the sensor recess (SN), and the guide region (FB) includes at least one raised region (VB) that protrudes from the outer surface of the guide region (FB) at a predetermined area therefrom, and wherein the guide region (FB) further includes at least one sealing element (DE) at a predetermined sealing area (DB) on the outer surface of the guide region (FB), and wherein the raised region (VB) is sized such that, when the guide region (FB) is inserted into the sensor recess (SN), there exists a predetermined gap (sp) between the raised region (VB) and the inner wall (IW) of the sensor recess (SN), wherein the predetermined gap (sp) is at least partially greater than the capillary action distance.
2. The electric drive device (10) according to claim 1, wherein, The guide region (FB) has a circular cross-section.
3. The electric drive device (10) according to claim 1 or 2, wherein, The predetermined sealing area (DB) is formed as a groove in the outer surface of the guide area (FB), the groove surrounding the outer surface of the guide area (FB) and including a groove bottom and a groove wall, wherein the raised area (VB) abuts against the groove and forms a groove wall, and the sealing element (DE) can be inserted into the groove.
4. The electric drive device (10) according to any one of claims 1 to 3, wherein, The sealing element (DE) is an O-ring (O1, O2).
5. The electric drive device (10) according to claim 3, wherein, The guide region (FB) includes 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 on the outer surface of the guide region (FB), and the guide region (FB) includes an additional raised region (VB2) located in another plane between the first O-ring (O1) and the second O-ring (O2).
6. The electric drive device (10) according to any one of claims 1 to 5, provided that claim 3 is referenced again, wherein, The at least one raised region (VB1, VB2) has a first region (B1) with a first radius (R1) on the outer side of the inner wall (IW) of the sensor recess (SN) that can face the sensor recess (SN), and a second region (B2) with a second radius (R2) adjacent to the first region (B1) and adjacent to the sealing region (DB) in the axial direction of the guide region (FB), wherein the second radius (R2) is greater than the first radius (R1).
7. The electric drive device (10) according to claim 6, wherein, The difference between the first radius (R1) and the second radius (R2) can be chosen in such a way that a balance is achieved between the size of the shoulder height at the protruding region and the capillary action, according to a pre-given value.
8. The electric drive device (10) according to claim 6 or 7, wherein, The first region (B1) includes a first length (h1) along the axial direction of the guide region (FB), and the second region (B2) includes a second length (h2) along the axial direction of the guide region (FB), wherein the second length (h2) is less than the first length (h1).
9. The electric drive device (10) according to any one of claims 1 to 8, wherein, The sensor recess (SN) at least partially includes a circular inner wall (IW) with an inner radius, and in the upper region (OB) of the sensor recess (SN) adjacent to the outer side of the housing (G), the inner radius increases outward at least partially or over the entire upper region (OB).
10. The electric drive device (10) according to any one of claims 1 to 9, wherein, The angle of the chamfer at the edge region above the sensor recess (SN) relative to the central axis of the sensor recess (SN) is shaped to be as small as possible, preferably smaller than a predetermined value.
11. The electric drive device (10) according to any one of claims 1 to 10, wherein, Capillary action is reduced beyond the predetermined capillary distance for a liquid.
12. The electric drive device (10) according to any one of claims 1 to 11, wherein, The raised area (VB) includes a support element that inhibits eccentric compression of the sealing element.
Citation Information
Patent Citations
Drive train of a purely electrically all-wheel drivable motor vehicle
WO2013083243A1