CN113386850A - Electric drive and electric power steering apparatus - Google Patents
Electric drive and electric power steering apparatus Download PDFInfo
- Publication number
- CN113386850A CN113386850A CN202010174592.4A CN202010174592A CN113386850A CN 113386850 A CN113386850 A CN 113386850A CN 202010174592 A CN202010174592 A CN 202010174592A CN 113386850 A CN113386850 A CN 113386850A
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- China
- Prior art keywords
- electric drive
- end cover
- shaft
- end cap
- rotor
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 claims description 8
- 239000011241 protective layer Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000017525 heat dissipation Effects 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0409—Electric motor acting on the steering column
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
Abstract
The application provides an electric drive and an electric power steering apparatus. An electric drive comprising: a first end cap including a first shaft hole and a plurality of first fixing parts; the second end cover comprises a second shaft hole and a plurality of second fixing parts corresponding to the first fixing parts; a plurality of connection members coupled between the corresponding respective first and second fixing portions such that the first end cap is fixed with respect to and separated from the second end cap; a rotor mounted on a rotating shaft extending through the first shaft hole and the second shaft hole; a stator interposed between the first and second end caps and arranged around the rotor; wherein the rotor comprises a plurality of axially extending slots in which magnets are arranged. The electric driver and the electric power steering device have the advantages of simple structure, easiness in manufacturing, convenience in mounting and the like, and the manufacturing cost can be reduced while the structural stability is ensured.
Description
Technical Field
The application relates to the field of motor structures. More specifically, the present application relates to an electric drive which aims to provide a reliable and low cost motor component assembly solution. The present application also relates to an electric power steering apparatus including the above electric drive.
Background
As is known, an electric machine or drive generally comprises a stator, a rotor and various auxiliary components. These components are typically housed within an integrally formed housing. For example, the housing may be manufactured using a process of extrusion molding of aluminum alloy, and have a substantially cylindrical structure. The housing may be sized and configured to fit various components of an electric drive to provide an assembly solution.
However, existing housings typically require special customization and are relatively high in cost. Therefore, there is a continuing need for new electric drive and electric power steering device solutions. It is desirable that new solutions provide improved manufacturing costs while ensuring assembly reliability.
Disclosure of Invention
It is an object of one aspect of the present application to provide an electric drive that employs an end cap and fixed component structure in place of a unitary housing. It is an object of another aspect of the present application to provide an electric power steering apparatus including the electric drive described above.
The purpose of the application is realized by the following technical scheme:
an electric drive comprising:
a first end cap including a first shaft hole and a plurality of first fixing parts;
the second end cover comprises a second shaft hole and a plurality of second fixing parts corresponding to the first fixing parts;
a plurality of connection members coupled between the corresponding respective first and second fixing portions such that the first end cap is fixed with respect to and separated from the second end cap;
a rotor mounted on a rotating shaft extending through the first shaft hole and the second shaft hole;
a stator interposed between the first and second end caps and arranged around the rotor;
wherein the rotor comprises a plurality of axially extending slots in which magnets are arranged.
In the above electric driver, optionally, the first end cover or the second end cover is formed by a punching process, and a plurality of mounting portions for fixing the electric driver are formed at a periphery of one of the first end cover and the second end cover.
In the above electric drive, optionally, the plurality of mounting portions are configured as flanges that project radially from an outer periphery of the first end cover or the second end cover, and include axially-oriented holes.
In the above electric drive, optionally, an electronic control unit heat sink is further included, the electronic control unit heat sink being attached to the other of the first end cover and the second end cover.
In the above electric driver, optionally, three first fixing portions and three second fixing portions corresponding to each other are provided along the peripheries of the first end cover and the second end cover, and three connecting members are respectively coupled between the respective first fixing portions and the respective second fixing portions.
In the above electric driver, optionally, the first fixing portion and the second fixing portion are holes extending in the axial direction, and a screw thread is provided on the inner wall.
In the above electric drive, optionally, the respective connecting members are arranged around the outer circumference of the stator.
In the above electric drive, optionally, the rotating shaft is rotatably mounted in the first shaft hole and the second shaft hole by a bearing and a spring.
In the above electric drive, optionally, the stator comprises a core and a protective layer, the protective layer being provided on an outer surface of the core, wherein the protective layer comprises a plastic-encapsulated structure.
An electric power steering apparatus comprising:
the steering rod is internally provided with a steering shaft;
the gear box is connected with the steering shaft; and
the above electric drive, the electric drive being coupled to the steering shaft.
The electric driver and the electric power steering device have the advantages of simple structure, easiness in manufacturing, convenience in use and the like, and the manufacturing cost can be reduced while the structural stability is ensured.
Drawings
The present application will be described in further detail below with reference to the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of illustrating the preferred embodiments and therefore should not be taken as limiting the scope of the present application. Furthermore, unless specifically stated otherwise, the drawings are intended to be conceptual in nature or configuration of the depicted objects and may contain exaggerated displays. The figures are also not necessarily drawn to scale.
FIG. 1 is a perspective view of one embodiment of an electric drive of the present application.
Fig. 2 is a cross-sectional view of the embodiment shown in fig. 1.
Detailed Description
Hereinafter, preferred embodiments of the present application will be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that the descriptions are illustrative only, exemplary, and should not be construed as limiting the scope of the application.
It should be noted that, as used herein, the terms top, bottom, upward, downward, and the like are defined with respect to the orientation of the figures. These terms of orientation are relative terms and vary according to the different positions and different states the component is in. Therefore, these directional terms should not be construed as limiting.
Furthermore, it should also be noted that for any single technical feature described or implied in the embodiments or drawings herein, these technical features (or their equivalents) can still be combined to obtain other embodiments not directly mentioned herein.
It should be noted that in different drawings, the same reference numerals indicate the same or substantially the same components.
The axial direction referred to herein refers to the length direction of the rotary shaft of the electric drive, and the radial direction referred to herein refers to the direction in which a ray originating from the rotary shaft of the electric drive and extending in a plane perpendicular to the axial direction is directed.
As shown in fig. 1, an electric drive 100 according to an embodiment of the present application includes a stationary assembly, a stator 140, a rotor, a rotating shaft 151, and the like.
It will be readily appreciated that the shaft 151 defines the axis of rotation of the overall electric drive 100. A rotor 150 (to be described in detail later) is mounted on the rotating shaft 151 so as to rotate about the rotation axis together with the rotating shaft 151. Bearing systems are mounted on the shaft 151 at both ends of the rotor 150. The stator 140 is typically disposed about the rotor 150 such that the rotor 150 will rotate relative to the stator 140 as it rotates with the shaft 151.
The fixing assembly is disposed around the stator 140 and the rotor 150. The fixing assembly includes a first end cap 110, a second end cap 120, and a plurality of connecting members 130.
The first end cap 110 is configured to be substantially cylindrical, and is provided at an edge thereof with a plurality of axially-oriented first fixing portions 111. The first fixing portion 111 may be a through hole, and may be configured as a threaded through hole such that a connection member such as a bolt may pass therethrough. As shown, three first fixing portions 111 are uniformly dispersed at the periphery of the first end cap 110. As described below, the first end cap 110 is further provided with a first shaft hole 112 for decorating the rotation shaft 151.
The second end cap 120 is configured to be substantially cylindrical and is provided at an edge thereof with a plurality of axially oriented second fixing portions 121. The second fixing portion 121 may be a blind hole with threads, for example, to provide a threaded mounting portion. The respective second fixing portions 121 are respectively matched with the respective first fixing portions 111, and are preferably disposed concentrically. As described later, the second end cap 120 is further provided with a second shaft hole 122 for decorating the rotation shaft 151.
The first and second fixing parts 111 and 121 may be configured to be formed through an extrusion process or a die-casting process. For example, in the illustrated embodiment, the first fixing portion 111 may be a hole formed through an extrusion process, and the second fixing portion 121 may be a hole formed through a die-casting process, and a screw thread may be formed on an inner wall of the hole through machining.
Correspondingly, the first and second end caps 110 and 120 may be made of cast iron or aluminum alloy and may be formed by a stamping or casting process.
The first end cap 110 may also be provided with a plurality of mounting portions 113 disposed about a periphery thereof such that the first end cap 110 is adapted to be attached to a steering rod of a vehicle steering wheel, not shown. For example, the mounting portion 113 may be a hole for mounting a bolt or a screw, the hole may be extended in an axial direction, and may be configured as a flange protruding from an outer circumference of the first end cover 110, and the flange may be protruding in a radial direction. The flange may be provided with axially extending holes so that the electric driver 110 can be secured to other components not shown through the holes. According to one embodiment of the present application, the electric drive 100 may be a drive motor for a steering column of a vehicle steering wheel, i.e., an EPS (electric Power steering) motor.
Similarly, various electronic devices, such as a control or electronic control unit, a printed circuit board, sensors, etc., may be attached to one side of the second end cap 120. However, such a structure is merely exemplary, and for example, the mounting portion may be provided on one of the first and second end caps 110 and 120, and the electronic device may be provided on the other of the first and second end caps 110 and 120.
Although not shown, it is readily understood that the shaft 151 may be rotatably connected to the first and second shaft holes 112 and 122 by a bearing system. The bearing system may for example comprise one or more bearings and corresponding springs or the like.
The plurality of connection members 130 are attached between the first and second fixing portions 111 and 121 such that the first end cap 110 is fixed with respect to the second end cap 120 and is separated from the second end cap 120. The connecting member 130 may be a fixing member such as a bolt, a screw, or a screw. The plurality of connection members 130 may be substantially uniformly arranged around the rotation axis and disposed at a position outside the outer circumference of the stator 140. The embodiment shown in fig. 1 includes three connecting members 130. More connecting parts can be arranged or other connecting structures can be adopted according to actual needs. The connecting member 130 may be, for example, a standard piece. In one embodiment of the present application, the connecting member 130 may include 3M 5 size bolts.
The first end cap 110, the second end cap 120, and the plurality of connecting members 130 collectively enclose and house various components of the electric drive 100. The not shown interior of the first and second end caps 110, 120 may be provided with a cylindrical receiving space so that the substantially cylindrical stator 140 can be sized to fit at the not shown interior of the first and second end caps 110, 120 and be secured by the first and second end caps 110, 120. In one embodiment of the present application, the stator 140 is configured to have an outer diameter of 90mm to accommodate the first end cap 110 and the second end cap 120.
A portion of the stator 140 is visible in fig. 1 and is housed in a space defined by the first end cap 110, the second end cap 120, and the plurality of connecting members 130. The stator 140 may be provided with a protective layer on an outer surface thereof. The protective layer may be a plastic-encapsulated structure. The plastic overmold is a continuous plastic film or layer formed on the surface of the core to protect the stator 140 from the surrounding environment. Thus, the structural integrity and heat dissipation capability of the stator 140 is ensured, and the electric drive 100 having the structure shown herein is still capable of normal operation in its installed environment.
In addition, an electronic control unit heat sink 160 may be further disposed on the second end cap 120. The ecu heat sink 160 is intended to provide heat dissipation capability to the electric drive 100. The periphery of the electric drive 100 between the first end cover 110 and the second end cover 120 may be configured without any components to provide a desired heat dissipation capability for the stator 140.
Fig. 2 is a cross-sectional view of the embodiment shown in fig. 1. For clarity, the electronic control unit heat sink 160 is omitted from FIG. 2. As shown, the stator 140 and the rotor 150 are disposed within a cavity enclosed by the first end cap 110, the second end cap 120, and the plurality of connecting members 130 (not shown). The rotor 150 is mounted on a rotating shaft 151, and the rotating shaft 151 extends through the first shaft hole 112 and the second shaft hole 122. The connection member 130 is disposed around the outer circumference of the stator 140. The stator 140 is schematically shown in fig. 2 by a light-colored portion and surrounds the rotor 150. The rotor 150 is disposed around a rotation shaft 151 and is rotatable with respect to the stator 140 along with the rotation shaft 151. The rotor 150 includes a plurality of slots arranged in an axial direction, and the magnets 152 may be installed in the slots. The magnet 152 may be inserted into the slot and secured by an interference fit. Two magnets 152 are schematically shown in fig. 2. The magnets in the rotor 150 may be arranged substantially symmetrically. In one embodiment, a total of eight magnets 152 are provided in the rotor 150, and the respective magnets 152 are uniformly arranged around the circumference of the rotating shaft 151.
The stator 140 may be fixed by a mounting portion provided at one side in an axial direction thereof. For example, in the illustrated embodiment, the stator 140 is fixed to the second end cover 120 by the mounting portion 141. The mounting portion 141 may also be provided therein with a lead wire or the like for the stator 140.
The electric drive 100 according to the present application may be a brushless motor, i.e. the stator 140 comprises coil windings and the rotor comprises permanent magnets. However, the electric drive 100 may have other suitable configurations as desired.
The present application further relates to an electric power steering apparatus. In one embodiment, an electric power steering apparatus includes: a steering rod having a steering shaft disposed therein; a gear case coupled with the steering shaft; and an electric drive 100 according to the above description. In the above-described embodiment, the electric driver 100 may be coupled to the steering shaft at the first end cover 110 side thereof through the mounting portion 113. Thus, the second end cap 120 of the electric drive and the attached electronic control unit heat sink 160 are positioned away from the steering rod and thus can provide the desired heat dissipation capability.
In one embodiment, the electric power steering apparatus may be a connecting rod coupled to a steering wheel of a vehicle. The electric drive 100 according to the present application is also applicable in other desired environments and locations, according to practical needs, and the electric power steering apparatus according to the present application is not limited to the connecting rod of the steering wheel of the vehicle, but may also be applied in other applications.
The electric drive and electric power steering apparatus of the present application do not require the use of a housing to mount the various components of the electric drive, thereby reducing overall manufacturing complexity, reducing manufacturing costs, and not affecting the structural strength and operation of the electric drive.
This written description discloses the application with reference to the drawings, and also enables one skilled in the art to practice the application, including making and using any devices or systems, selecting appropriate materials, and using any incorporated methods. The scope of the present application is defined by the claims and encompasses other examples that occur to those skilled in the art. Such other examples are to be considered within the scope of protection defined by the claims of this application, provided that they include structural elements that do not differ from the literal language of the claims, or that they include equivalent structural elements with insubstantial differences from the literal language of the claims.
Claims (10)
1. An electric drive, characterized by comprising:
a first end cap (110) including a first shaft hole (112) and a plurality of first fixing portions (111);
a second end cap (120) including a second shaft hole (122) and a plurality of second fixing portions (121) corresponding to the plurality of first fixing portions (111);
a plurality of connection members (130), the plurality of connection members (130) being coupled between corresponding respective first and second fixing portions (111, 121) such that the first end cap (110) is fixed with respect to the second end cap (120) and is separated from the second end cap (120);
a rotor (150) mounted on a rotating shaft (151), the rotating shaft (151) extending through the first shaft hole (112) and the second shaft hole (122);
a stator (140) interposed between the first end cover (110) and the second end cover (120) and arranged around the rotor (150);
wherein the rotor (150) comprises a plurality of axially extending slots in which magnets (152) are disposed.
2. The electric drive of claim 1, wherein the first end cover (110) or the second end cover (120) is formed by a stamping process, and a plurality of mounting portions (113) for securing the electric drive are formed at a periphery of one of the first end cover (110) and the second end cover (120).
3. The electric drive of claim 2, wherein the plurality of mounting portions (113) are configured as flanges protruding radially from an outer periphery of the first end cover (110) or the second end cover (120) and include axially oriented bores.
4. The electric drive of claim 2, further comprising an electronic control unit heat sink (160), the electronic control unit heat sink (160) being attached to the other of the first end cover (110) and the second end cover (120).
5. Electric drive according to claim 1, characterized in that along the periphery of the first (110) and second (120) end covers three first (111) and second (121) fixing portions corresponding to each other are provided, three connecting members (130) being respectively coupled between each first (111) and each second (121) fixing portion.
6. Electrical drive according to claim 5, characterized in that the first (111) and second (121) fixing portions are holes extending in the axial direction and provided with a thread on the inner wall.
7. The electric drive according to any one of claims 1 to 6, characterized in that each of the connecting members (130) is arranged around the periphery of the stator (140).
8. Electric drive according to one of claims 1 to 6, characterized in that the rotary shaft (151) is rotatably mounted in the first shaft bore (112) and the second shaft bore (122) by means of bearings and springs.
9. The electric drive according to any of the claims 1 to 6, characterized in that a protective layer is provided on the outer surface of the stator (140), wherein the protective layer comprises a plastic-encapsulated structure.
10. An electric power steering apparatus characterized by comprising:
the steering rod is internally provided with a steering shaft;
a gearbox coupled with the steering shaft; and
an electric drive according to any one of claims 1 to 9, which is coupled to the steering shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010174592.4A CN113386850A (en) | 2020-03-13 | 2020-03-13 | Electric drive and electric power steering apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010174592.4A CN113386850A (en) | 2020-03-13 | 2020-03-13 | Electric drive and electric power steering apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113386850A true CN113386850A (en) | 2021-09-14 |
Family
ID=77615884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010174592.4A Pending CN113386850A (en) | 2020-03-13 | 2020-03-13 | Electric drive and electric power steering apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113386850A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006025509A (en) * | 2004-07-07 | 2006-01-26 | Nsk Ltd | Motor for electric power steering system and electric power steering system |
| CN103580356A (en) * | 2012-08-03 | 2014-02-12 | 株式会社电装 | Rotating electric machine and electric power steering device |
| CN105827048A (en) * | 2015-01-26 | 2016-08-03 | 株式会社电装 | Rotating electrical machine |
| CN108945085A (en) * | 2017-05-19 | 2018-12-07 | 上海海拉电子有限公司 | A kind of electric boosting steering system |
| CN208439059U (en) * | 2018-04-28 | 2019-01-29 | 博世汽车部件(长沙)有限公司 | Electric drive and vehicle |
| CN209462111U (en) * | 2019-04-02 | 2019-10-01 | 恒速控股有限公司 | The shellless motor of high starting torque |
-
2020
- 2020-03-13 CN CN202010174592.4A patent/CN113386850A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006025509A (en) * | 2004-07-07 | 2006-01-26 | Nsk Ltd | Motor for electric power steering system and electric power steering system |
| CN103580356A (en) * | 2012-08-03 | 2014-02-12 | 株式会社电装 | Rotating electric machine and electric power steering device |
| CN105827048A (en) * | 2015-01-26 | 2016-08-03 | 株式会社电装 | Rotating electrical machine |
| CN108945085A (en) * | 2017-05-19 | 2018-12-07 | 上海海拉电子有限公司 | A kind of electric boosting steering system |
| CN208439059U (en) * | 2018-04-28 | 2019-01-29 | 博世汽车部件(长沙)有限公司 | Electric drive and vehicle |
| CN209462111U (en) * | 2019-04-02 | 2019-10-01 | 恒速控股有限公司 | The shellless motor of high starting torque |
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