CN210526276U - Electric drive device - Google Patents
Electric drive device Download PDFInfo
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- CN210526276U CN210526276U CN201921626498.7U CN201921626498U CN210526276U CN 210526276 U CN210526276 U CN 210526276U CN 201921626498 U CN201921626498 U CN 201921626498U CN 210526276 U CN210526276 U CN 210526276U
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- bearing
- rotor
- electric drive
- gear shaft
- housing
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Abstract
The utility model relates to an electric drive device, include: a first housing; an input gear shaft; a first bearing; a second bearing; an electric motor including a rotor; the first shell is also provided with a cylindrical part extending into the inner cavity of the rotor, and a bearing hole is formed in the inner cavity of the cylindrical part; the first bearing and the second bearing are arranged in the bearing holes to support the input gear shaft, and the rotor is fixedly connected to the tail of the input gear shaft. In another embodiment, the electric drive device, wherein the input shaft unit includes a bearing inner race and a bearing outer race, a front portion of the bearing outer race is disposed in the bearing hole of the first housing, and one end of the bearing outer race extends into the inner cavity of the rotor; at least two rows of rolling ways and balls are correspondingly arranged on the bearing inner ring and the bearing outer ring so as to support the bearing inner ring on the bearing outer ring, and the rotor is fixedly connected to the tail part of the bearing inner ring. Because the bearing hole is only arranged on the first shell, the bearing hole can be machined by one tool, the concentricity and the meshing precision are ensured, the NVH performance is improved, parts are reduced, and the cost is reduced.
Description
Technical Field
The utility model relates to a vehicle technical field especially relates to vehicle drive transmission technical field, specifically indicates an electric drive device.
Background
In the existing electric drive for a new energy vehicle, bearings are usually provided on two housings for supporting the rotor shaft of the drive motor, and the rotor shaft is mounted in place after the multiple housings are assembled. Due to the accumulated error formed during the assembly of the multiple parts, it is difficult to ensure concentricity of the two bearings, limiting the improvement of NVH performance.
However, the existing electric driving device faces urgent needs of two aspects, namely further reducing the system cost and simultaneously requiring improving the NVH performance to enhance the comfort of the whole vehicle. Accordingly, it is also desirable to provide an electric drive device that can reduce cost while improving NVH performance.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a can reduce cost, improve the electric drive device of NVH performance simultaneously to overcome prior art's above-mentioned defect.
In order to achieve the above object, the electric drive device of the present invention includes: a first housing; a second housing; the first shell and the second shell form a cavity after being assembled; an input gear shaft having a gear portion installed in a cavity formed after the first and second housings are assembled; a first bearing; a second bearing; the motor comprises a rotor and a stator, wherein the stator is sleeved outside the rotor; the first shell is also provided with a cylindrical part, the cylindrical part extends into an inner cavity of the rotor, and two bearing holes for installing the first bearing and the second bearing respectively are formed in the inner cavity of the cylindrical part; the input gear shaft is supported on the first bearing and the second bearing, and the rotor is fixedly connected to the tail part of the input gear shaft.
According to the electric drive device, the second bearing is installed the intermediate position department of rotor.
According to electric drive arrangement, electric drive arrangement still include the oil blanket, the assembly is in the inner chamber of cylinder portion, and be located the outside of second bearing, and with the input gear axle contact.
According to electric drive arrangement, the motor still includes the rotor bracket, the rotor suit is in on the rotor bracket, the rotor bracket rigid coupling is in the afterbody of input gear shaft.
According to electric drive arrangement, electric drive arrangement still include angle sensor, angle sensor includes sensor rotor and sensor stator, the input gear shaft still has angle sensor portion, the sensor rotor cover is established angle sensor portion is last, the sensor stator sets firmly on the second casing.
The utility model discloses an another kind of electric drive device includes: a first housing; a second housing; the first shell and the second shell form a cavity after being assembled; the motor comprises a rotor and a stator, wherein the stator is sleeved outside the rotor; an input shaft unit including a bearing inner race and a bearing outer race, a front portion of the bearing outer race being installed in a bearing hole of the first housing, one end of the bearing outer race extending into an inner cavity of the rotor; the bearing inner ring and the bearing outer ring are also correspondingly provided with at least two rows of raceways and balls so as to support the bearing inner ring on the bearing outer ring; the bearing inner ring is provided with a gear part, the gear part is positioned in the cavity, and the rotor is fixedly connected to the tail part of the bearing inner ring.
According to the electric drive device of the present invention, at least one row of raceways is provided at an intermediate position of the rotor.
According to electric drive arrangement, the input shaft unit still includes the oil blanket, the assembly is in bearing inner race's afterbody and with the contact of bearing inner race.
Electric drive arrangement, the motor still includes rotor bracket, the rotor suit is in on the rotor bracket, rotor bracket with set up the terminal surface spline on the relative terminal surface of bearing inner circle, be equipped with the through-hole on the rotor bracket, circle in the bearing and be equipped with the screw hole, the bolt passes the through-hole twists will behind the screw hole the rotor bracket rigid coupling is in the afterbody of bearing inner circle.
According to electric drive arrangement, the bearing inner race still has parking ratchet portion, the parking ratchet sets firmly on the ratchet portion.
The utility model discloses an electric drive device only establishes on first casing because of the dead eye, but a sword processing comes out, ensures concentricity and meshing precision, has improved the NVH performance, and has reduced the part, the cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an electric drive device according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an electric drive device according to another embodiment of the present invention.
Fig. 3 is a schematic structural view of a face spline according to the embodiment shown in fig. 2.
Reference numerals
100 electric drive means;
1 first casing
11 cylindrical part
12 cavity
13 bearing hole
2 second housing
3 input gear shaft
31 gear part
32-degree sensor unit
41 first bearing
42 second bearing
5 electric motor
51 rotor
52 stator
53 rotor bracket
53S rotor bracket end face spline
53H through hole
6 oil seal
7-degree sensor
71 sensor rotor
72 sensor stator
8 input shaft unit
81 bearing inner race
811 gear part
812 ratchet part
81S inner ring end face spline
81H threaded hole
82 bearing outer ring
821 fixed flange
83 ball
84 bolt
9 parking ratchet wheel
Detailed Description
In order to clearly understand the technical contents of the present invention, the following embodiments are specifically illustrated in detail. It is to be understood that the examples are for illustrative purposes only and are not intended to limit the present invention.
Fig. 1 is a schematic structural diagram of an electric drive device according to an embodiment of the present invention. Referring to fig. 1, an electric drive device 100 includes: a first housing 1; a second housing 2; an input gear shaft 3 having a gear portion 31, the gear portion 31 being disposed in a cavity 12 formed after the first and second housings 1 and 2 are assembled; a first bearing 41 and a second bearing 42; the motor 5 comprises a rotor 51 and a stator 52, wherein the stator 52 is sleeved on the outer side of the rotor 51; the first shell 1 further has a cylindrical portion 11, the cylindrical portion 11 extends into an inner cavity of the rotor 51, and a bearing hole 13 is further formed in the inner cavity of the cylindrical portion 11; the first bearing 41 and the second bearing 42 are respectively installed in the corresponding bearing holes 13, the input gear shaft 3 is supported on the first bearing 41 and the second bearing 42, and the rotor 51 is fixed to the rear portion of the input gear shaft 3.
The second bearing 42 is installed at an intermediate position of the rotor 51. As shown in fig. 1, the second bearing 42 is disposed at an intermediate position of the rotor 51 with the cylindrical portion 11 extending into the inner cavity of the rotor 51. As such, the weight of the rotor 51 is borne primarily by the second bearing 42.
The electric drive 100 further includes an oil seal 6 fitted in the inner cavity of the cylindrical portion 11 and located outside the second bearing 42 and in contact with the input gear shaft 3. That is, the oil seal 6 is used to seal the cylindrical portion 11, and the lubricating oil in the cavity 12 can flow into the cylindrical portion 11, thereby lubricating the second bearing 42 as well and ensuring a sufficient life.
The motor 5 further includes a rotor bracket 53, the rotor 51 is sleeved on the rotor bracket 53, and the rotor bracket 53 is fixedly connected to the tail portion of the input gear shaft 3. The rotor bracket 53 is cup-shaped to receive the cylindrical portion 11 which extends into the interior cavity of the rotor 51. The rotor bracket 53 may have a boss portion, an internal spline is provided therein, and is fitted with an external spline on the input gear shaft 3, a threaded section is further provided at the tail portion of the input gear shaft 3, and the rotor bracket 53 is fixedly connected to the tail portion of the input gear shaft 3 after the nut is screwed on. Spline teeth can be punched by silicon steel sheets of the rotor, and the hub is formed after lamination and connected with the input gear shaft 3, namely, a separate rotor bracket is not needed. Other connection means are possible and not limited thereto.
The electric drive 100 further comprises an angle sensor 7, the angle sensor 7 comprises a sensor rotor 71 and a sensor stator 72, the input gear shaft 3 further comprises an angle sensor portion 32, the sensor rotor 71 is sleeved on the angle sensor portion 32, and the sensor stator 72 is fixedly arranged on the second housing 2. A resolver is typically used as the angle sensor 7 to provide an accurate rotor angle signal, but other types of angle position sensors are possible and not limited thereto.
Fig. 2 is a schematic structural diagram of an electric drive device according to another embodiment of the present invention. As shown in fig. 2, the electric drive device 100 includes: a first housing 1; a second housing 2; after the first shell 1 and the second shell 2 are assembled, a cavity 12 is formed; the motor 5 comprises a rotor 51 and a stator 52, wherein the stator 52 is sleeved on the outer side of the rotor 51;
an input shaft unit 8 including a bearing inner race 81 and a bearing outer race 82, a front portion of the bearing outer race 82 being installed in the bearing hole 13 of the first housing 1, one end of the bearing outer race 82 extending into an inner cavity of the rotor 51; at least two rows of raceways and balls 83 are correspondingly arranged on the bearing inner ring 81 and the bearing outer ring 82 to support the bearing inner ring 81 on the bearing outer ring 82; the bearing inner race 81 has a gear portion 811, the gear portion 811 is located in the cavity 12, and the rotor 51 is fixed to the end of the bearing inner race 81.
The input shaft unit 8 is formed by integrating two bearings into a multi-row bearing and machining a gear portion 811 on the bearing inner ring 81, so that the number of parts is further reduced, the machining accuracy is easily ensured, the NVH performance is improved, and the cost is reduced. Furthermore, it is advantageous for the division and cooperation of professional factories, for example bearing factories, which can produce the input shaft unit 8, to be supplied as a component to the transmission factory, and the procurement and production of the transmission factory is thereby simplified.
The bearing outer ring 82 is fixed on the first housing 1, and a flange may be provided thereon and fastened to the first housing by bolts. The first housing 1 may also be provided with a seam allowance, and the bearing outer ring 82 is fixed on the first housing 1 by matching with the snap spring, and other assembling manners are also possible and are not limited thereto.
As shown in fig. 2, at least one row of raceways and balls 83 is provided at an intermediate position of the rotor 51. I.e., the raceways and balls 83 of the two rows are spaced apart, the raceways and balls 83 near the center of the rotor 51 bear primarily the weight of the rotor 51. Obviously, the greater the distance apart, the greater the support rigidity. In order to increase the bearing rigidity, the deep groove ball bearing may be replaced by an angular contact ball bearing, i.e. the raceway may be provided according to the bearing characteristics to be achieved, but this is not limiting, and other types of bearings are possible and may be selected as required.
The input shaft unit 8 further includes an oil seal 6 fitted to the rear of the bearing outer race 82 and in contact with the bearing inner race 81. I.e., the oil seal 6, is used to seal one end of the input shaft unit 8, the lubricating oil in the cavity 12 can flow between the bearing inner race 81 and the bearing outer race 82, thereby lubricating all the raceways and balls 83 and ensuring a sufficient life of the input shaft unit 8.
The motor 5 further includes a rotor bracket 53, the rotor 51 is sleeved on the rotor bracket 53, a rotor bracket end face spline 53S and an inner ring end face spline 81S are correspondingly arranged on the end face of the rotor bracket 53 opposite to the bearing inner ring 81, the structure of the motor can be seen from fig. 3, a through hole 53H is arranged on the rotor bracket 53, a threaded hole 81H is arranged on the inner ring 81, and the rotor bracket 53 is fixedly connected to the tail portion of the inner ring 81 after a bolt 84 penetrates through the through hole 53H and is screwed into the threaded hole 81H. The teeth of the rotor carrier end face spline 53S are fitted into the corresponding tooth grooves of the inner ring end face spline 81S, and the power of the motor 5 is transmitted from the rotor carrier 53 to the bearing inner ring 81 and is output through the gear portion 811. The face spline has good self-centering properties and is less expensive to manufacture than the inner and outer splines. Other connection means are possible and not limited thereto.
In addition to the shaft section for mounting the angle sensor 7, a shaft section for fastening the parking ratchet 9 may also be provided on the bearing inner 81. The bearing inner 81 also has a ratchet portion 812, and the parking ratchet 9 is fixed to the ratchet portion 812. Namely, the parking ratchet wheel 9 is sleeved on the bearing inner ring 81, and the teeth of the parking ratchet wheel are connected with the pawl of the parking mechanism so as to realize the P gear locking function.
The utility model discloses specific embodiment's electric drive arrangement, include: a first housing; a second housing; the first shell and the second shell form a cavity after being assembled; an input gear shaft having a gear portion disposed in the cavity; a first bearing; a second bearing; an electric motor including a rotor and a stator; the first shell is also provided with a cylindrical part, the cylindrical part extends into the inner cavity of the rotor, and a bearing hole is also formed in the inner cavity of the cylindrical part; the first bearing and the second bearing are arranged in the bearing hole, the input gear shaft is supported on the first bearing and the second bearing, and the rotor is fixedly connected to the tail portion of the input gear shaft. The first shell is provided with the cylindrical part extending into the inner cavity of the rotor, the first bearing and the second bearing are arranged on the bearing holes in the inner cavity of the cylindrical part, the input gear shaft is supported on the first bearing and the second bearing, and the rotor is fixedly connected to the tail part of the input gear shaft, so that the bearing holes are all formed in the first shell, a cutter can be machined, the concentricity and the meshing precision are ensured, the NVH performance is improved, the rotor and the input gear shaft only need to be supported by two bearings, parts are reduced, and the cost is reduced.
The present invention is not limited to the above-described embodiments, but covers all changes and modifications that may be made without departing from the spirit and scope of the present invention. Such changes and modifications are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of protection.
Claims (10)
1. An electric drive device, characterized in that the device comprises:
a first housing;
a second housing;
an input gear shaft having a gear portion installed to form a cavity after the first and second housings are assembled;
a first bearing;
a second bearing;
the motor comprises a rotor and a stator, wherein the stator is sleeved outside the rotor;
the first shell is also provided with a cylindrical part, the cylindrical part extends into an inner cavity of the rotor, and two bearing holes for installing the first bearing and the second bearing respectively are formed in the inner cavity of the cylindrical part;
the input gear shaft is supported on the first bearing and the second bearing, and the rotor is fixedly connected to the tail part of the input gear shaft.
2. The electric drive of claim 1 wherein the second bearing is disposed at an intermediate position of the rotor.
3. An electric drive device as set forth in claim 2 further comprising an oil seal fitted in the interior cavity of said cylindrical portion and located outside of said second bearing and in contact with said input gear shaft.
4. The electric drive of claim 3 wherein said motor further comprises a rotor bracket, said rotor being mounted on said rotor bracket, said rotor bracket being fixedly attached to a rear portion of said input gear shaft.
5. The electric drive of claim 4 further comprising an angle sensor including a sensor rotor and a sensor stator, said input gear shaft further having an angle sensor portion, said sensor rotor being disposed over said angle sensor portion, said sensor stator being disposed on said second housing.
6. An electric drive device, characterized in that the device comprises:
a first housing;
a second housing;
the first shell and the second shell form a cavity after being assembled;
the motor comprises a rotor and a stator, wherein the stator is sleeved outside the rotor;
an input shaft unit including a bearing inner race and a bearing outer race, a front portion of the bearing outer race being installed in a bearing hole of the first housing, one end of the bearing outer race extending into an inner cavity of the rotor; the bearing inner ring and the bearing outer ring are also correspondingly provided with at least two rows of raceways and balls so as to support the bearing inner ring on the bearing outer ring; the bearing inner ring is provided with a gear part, the gear part is positioned in the cavity, and the rotor is fixedly connected to the tail part of the bearing inner ring.
7. An electric drive device according to claim 6, characterized in that at least one row of raceways is provided at an intermediate position of the rotor.
8. The electric drive of claim 7 wherein said input shaft unit further comprises an oil seal mounted aft of said bearing outer race and in contact with said bearing inner race.
9. The electric drive device according to claim 8, wherein the motor further comprises a rotor bracket, the rotor is sleeved on the rotor bracket, an end face spline is arranged on an end face of the rotor bracket opposite to the bearing inner ring, a through hole is arranged on the rotor bracket, a threaded hole is arranged on the bearing inner ring, and a bolt is screwed into the threaded hole through the through hole to fixedly connect the rotor bracket to the tail part of the bearing inner ring.
10. The electric drive device of claim 9, wherein the bearing inner race further has a ratchet portion on which a parking ratchet is fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921626498.7U CN210526276U (en) | 2019-09-27 | 2019-09-27 | Electric drive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921626498.7U CN210526276U (en) | 2019-09-27 | 2019-09-27 | Electric drive device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210526276U true CN210526276U (en) | 2020-05-15 |
Family
ID=70606912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921626498.7U Active CN210526276U (en) | 2019-09-27 | 2019-09-27 | Electric drive device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210526276U (en) |
-
2019
- 2019-09-27 CN CN201921626498.7U patent/CN210526276U/en active Active
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| GR01 | Patent grant |