CN111106707A - Motor shaft suitable for new energy automobile - Google Patents
Motor shaft suitable for new energy automobile Download PDFInfo
- Publication number
- CN111106707A CN111106707A CN201911103090.6A CN201911103090A CN111106707A CN 111106707 A CN111106707 A CN 111106707A CN 201911103090 A CN201911103090 A CN 201911103090A CN 111106707 A CN111106707 A CN 111106707A
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- China
- Prior art keywords
- motor shaft
- connecting portion
- bearing installation
- installation department
- new energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/003—Couplings; Details of shafts
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention provides a motor shaft suitable for a new energy automobile, wherein the motor shaft comprises a first bearing installation part and a second bearing installation part which are respectively positioned at two ends of the motor shaft and a rotor connecting part which is positioned in the middle of the motor shaft, first cylindrical cavities are respectively arranged in the motor shaft corresponding to the first bearing installation part, the second bearing installation part and the rotor connecting part along the axis direction, the inner diameters of the first cylindrical cavities are all different, and the diameters of the outer peripheral surfaces of the first bearing installation part, the second bearing installation part and the rotor connecting part are all equal to the difference d1 between the inner diameters of the corresponding first cylindrical cavities. According to the motor shaft suitable for the new energy automobile, the plurality of columnar cavities with different inner diameters are arranged in the axial direction of the motor shaft, the axial length of each cavity is equal to that of each mounting section, and the wall thickness of each mounting section is guaranteed to be equal, so that the light weight design of the whole motor shaft is realized, the oil consumption of the whole automobile is reduced, the cost is reduced, and the product competitiveness is improved.
Description
Technical Field
The invention relates to the technical field of mechanical transmission, in particular to a motor shaft in the field of automobiles, and particularly relates to a motor shaft suitable for a new energy automobile.
Background
The motor shaft is an important component of a motor in an automobile transmission system, drives a rotor in the motor to move, and plays roles in transmitting torque and bearing load, so that mutual conversion between electric energy and mechanical energy is realized; and the output shaft of the speed reducer and the differential are connected to control the running of the automobile, and the control device is a key part for determining the driving performance and the running stability of the automobile.
In order to reasonably distribute and bear the loads of a motor shaft, such as torque, torque and bending moment, and simultaneously to optimize the structure and reduce the part quality, the traditional solid shaft is mostly replaced by the motor shaft in the existing motor shaft, but the diameter of the structural cavity of the existing hollow motor shaft is kept consistent, the purposes of saving materials and reducing cost are not achieved to a certain extent, and the requirement of light weight development of a new energy automobile cannot be met.
Disclosure of Invention
In view of this, the invention aims to provide a light-weight motor shaft, which can bear larger torque of the motor shaft on the basis of reducing weight and saving cost, so as to meet the requirement of light-weight development of new energy automobiles.
The technical scheme of the invention is realized as follows: the invention provides a motor shaft suitable for a new energy automobile, which comprises a first bearing mounting part and a second bearing mounting part which are respectively positioned at two ends of the motor shaft and a rotor connecting part which is positioned in the middle of the motor shaft, wherein first cylindrical cavities are respectively arranged in the motor shaft corresponding to the first bearing mounting part, the second bearing mounting part and the rotor connecting part along the axis direction, the inner diameters of the first cylindrical cavities are all different, and the diameters of the outer peripheral surfaces of the first bearing mounting part, the second bearing mounting part and the rotor connecting part are all equal to the difference d1 between the inner diameters of the corresponding first cylindrical cavities.
Furthermore, the one end that the motor shaft is close to first bearing installation department has set gradually the first connecting portion that are used for installing the reduction gear and the second connecting portion that are used for installing differential mechanism from up down.
Furthermore, second cylindrical cavities are respectively arranged in the motor shaft corresponding to the first connecting part and the second connecting part along the axis direction, the inner diameters of the second cylindrical cavities are not equal, the difference d2 between the diameters of the outer peripheral surfaces of the first connecting part and the second connecting part and the inner diameter of the corresponding second cylindrical cavity is equal, and d1 and d2 are also equal.
On the basis of the above technical solution, preferably, the outer peripheral surface of the first connecting portion is uniformly distributed with oblique splines, the helix angle of the oblique splines is 21 ° 51' -22 °, and the tooth width of the oblique splines is 42-43 mm.
On the basis of the above technical scheme, preferably, straight splines are uniformly distributed on the outer peripheral surface of the second connecting part, and the tooth width of the straight splines is 16-17 mm.
On the basis of above technical scheme, it is preferred, first bearing installation department with the junction of rotor connecting portion is formed with first shaft shoulder, first bearing installation department with the junction of first connecting portion is formed with the second shaft shoulder, the second bearing installation department with be formed with third shaft shoulder and fourth shaft shoulder between the rotor connecting portion, second bearing installation department uses third shaft shoulder and fourth shaft shoulder as the border, forms by interior two concentric shafts that outside diameter reduces in proper order.
On the basis of the technical scheme, preferably, the motor shaft material is 25CrMo4 alloy structural steel.
Compared with the prior art, the invention has the following beneficial effects:
according to the motor shaft suitable for the new energy automobile, the plurality of columnar cavities with different inner diameters are arranged in the axial direction of the motor shaft, the axial length of each cavity is equal to that of each mounting section, and the wall thickness of each mounting section is guaranteed to be equal, so that the light weight design of the whole motor shaft is realized, the oil consumption of the whole automobile is reduced, the cost is reduced, and the product competitiveness is improved. Compared with the traditional hollow motor shaft with the same through cavity inner diameter, the motor shaft is lighter, the cost is greatly saved, the larger torque can be ensured, the critical rotating speed is higher, the service life is prolonged, and the motor shaft has better economic benefit and wide market prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a motor shaft according to the present disclosure;
fig. 2 is a plan sectional view of a motor shaft disclosed in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1 and fig. 2, an embodiment of the invention discloses a motor shaft suitable for a new energy automobile, and the motor shaft includes a first bearing mounting part 1 located at one end of the motor shaft, a second bearing mounting part located at the other end of the motor shaft, and a rotor connecting part located in the middle of the motor shaft. Motor corresponding to first bearing installation part 1, second bearing installation part 2 and rotor connection part 3The shaft is internally provided with first cylindrical cavities 4 along the axis direction respectively, and the inner diameter D of each first cylindrical cavity 401Are all unequal, and the diameters D of the outer peripheral surfaces of the first bearing mounting part 1, the second bearing mounting part 2 and the rotor connecting part 3X1And the difference d1 between the inner diameters of the corresponding first cylindrical cavities 4. By adopting the technical scheme, the motor shaft is a hollow shaft, and the equal wall thickness of the motor shaft where the mounting part and the connecting part are located is ensured. Thereby realized whole motor shaft lightweight design, driven the rotor in the motor by the motor shaft then and rotated, played the transmission moment of torsion and born the effect of load to this interconversion that realizes between electric energy and the mechanical energy, this kind of motor shaft is favorable to reducing whole car oil consumption, reduces the cost, promotes product competitiveness simultaneously. Compared with the traditional hollow motor shaft with the same through cavity inner diameter, the motor shaft is lighter, the cost is greatly saved, the larger torque can be ensured, the critical rotating speed is higher, the service life is prolonged, and the motor shaft has better economic benefit and wide market prospect.
Specifically, a first connecting portion 5 for mounting the speed reducer and a second connecting portion 6 for mounting the differential are sequentially arranged from bottom to top at one end of the motor shaft close to the first bearing mounting portion 1. The speed reducer is arranged on the first connecting part 5 of the motor shaft, so that the functions of reducing the rotating speed and increasing the torque are mainly achieved. Through installing differential mechanism on second connecting portion 6 at the motor shaft, when satisfying the car and turning, the different requirement of both sides wheel rotational speed.
In the embodiment, the oblique splines 51 are uniformly distributed on the outer peripheral surface of the first connecting part 5, the helix angle of the oblique splines 51 is 21 degrees to 51-22 degrees, and the tooth width of the oblique splines 51 is 42-43 mm. Through the arrangement of the oblique spline 51, the matching precision of the motor shaft and the speed reducer can be improved, and the rigidity of the motor shaft is favorably increased, so that the service life of the motor shaft is prolonged.
In the embodiment, the straight splines 61 are uniformly distributed on the outer peripheral surface of the second connecting part 6, and the tooth width of the straight splines 61 is 16-17 mm. Through the setting of straight spline 61, can improve the bearing capacity of motor shaft, further improve the installation accuracy of motor shaft and differential mechanism.
In this embodiment, second cylindrical cavities 7 are provided in the motor shaft corresponding to the first connection portion 5 and the second connection portion 6, respectively, along the axial direction, and the inner diameter D of each second cylindrical cavity 702Unequal, outer peripheral diameter D of the first and second connection portions 5, 6X2The difference d2 between the inner diameters of the corresponding second cylindrical cavities 7 is equal, and d1 and d2 are also equal. By adopting the technical scheme, the equal wall thickness of each mounting section of the whole motor shaft can be realized, the lightweight design of the motor shaft is further realized, and the cost is reduced. Meanwhile, under the condition of the same external torque, the motor shaft of the invention adopts a hollow design with the same wall thickness, so that the material is saved compared with the traditional hollow shaft with the same inner diameter of the through cavity. The motor shaft is light, and the torsional rigidity of the shaft parts is improved.
A first shoulder 8 is formed at the joint of the first bearing mounting portion 1 and the rotor connecting portion 3, and the bearing abuts against the first shoulder 8 when the bearing is mounted in the first bearing mounting portion 1. A second shoulder 9 is formed at the junction of the first bearing mounting portion 1 and the first connecting portion 5, and the speed reducer abuts against the second shoulder 9 when the speed reducer is mounted in the first connecting portion 5. Second bearing installation department 2 with be formed with third shoulder 10 and fourth shoulder 11 between the rotor connecting portion 3, second bearing installation department 2 uses third shoulder 10 and fourth shoulder 11 as the border, forms two concentric shafts that reduce in proper order by inside outside diameter. When the bearing is mounted in the second bearing mounting part 2, the bearing abuts against the third shoulder 10.
The 40Cr belongs to medium-carbon alloy steel, is suitable for shaft parts with medium precision and high rotating speed, has poor quenching performance, and can be only hardened to HRC 45-52. But as the rotating shaft in the new energy automobile motor, the hardness is insufficient, the abrasion is fast, and the rotating shaft is not suitable for the working conditions of high speed and heavy load. The hollow motor shaft with the equal wall thickness is used on a new energy automobile, the motor shaft is required to have stronger hardness, and can achieve larger torque under the condition of preventing shaft breakage, and obviously, the existing 40Cr can not meet the requirement at all.
The inventor who makes substantial contribution to the invention, through a large amount of process tests, firstly uses 25CrMo4 carburizing steel as the material of the motor rotating shaft, and achieves good effect.
The 25CrMo4 belongs to alloy structural steel, and alloy elements are added into the steel, so that the hardenability of the steel is improved, the steel is ensured to obtain good comprehensive mechanical properties after heat treatment, and the steel has high strength and enough toughness. Low carbon steel with carbon content of 0.22-0.29%.
Through a large number of process tests, the surface strengthening heat treatment is carried out on the hollow motor shaft made of 25CrMo4, namely the whole hollow motor shaft is carburized, quenched and tempered, a surface strengthening layer is required to be continuous, the carburization depth is 0.2-0.7mm calculated from the surface of the hollow motor shaft, the high-fatigue-strength hollow motor shaft is obtained because a certain surface strengthening layer depth is achieved and good tempering control is assisted, the effective quenching range of the surface of the hollow motor shaft is required to meet the conditions that the minimum hardness is HRC57.8 and the minimum hardness of the core part of the hollow motor shaft is HRC 31. And 40Cr can be only hardened to HRC 45-52, so that the 25CrMo4 has stronger comprehensive performance, prevents the hollow motor shaft from being broken, and is more suitable for working at high speed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The utility model provides a motor shaft suitable for new energy automobile, the motor shaft is including first bearing installation department (1) and second bearing installation department (2) that are located the motor shaft both ends respectively and be located rotor connecting portion (3) at motor shaft middle part, its characterized in that: the motor shaft that first bearing installation department (1), second bearing installation department (2) and rotor connecting portion (3) correspond is inside to be provided with first column cavity (4) along the axis direction respectively, each the internal diameter of first column cavity (4) all varies, and the outer peripheral face diameter of first bearing installation department (1), second bearing installation department (2) and rotor connecting portion (3) and the internal diameter difference d1 of the first column cavity (4) that corresponds all equal.
2. The motor shaft suitable for the new energy automobile of claim 1, characterized in that: the one end that the motor shaft is close to first bearing installation department (1) is from up setting gradually first connecting portion (5) that are used for installing the reduction gear and second connecting portion (6) that are used for installing differential mechanism down.
3. The motor shaft suitable for the new energy automobile of claim 2, characterized in that: second cylindrical cavities (7) are respectively arranged in the motor shafts corresponding to the first connecting portion (5) and the second connecting portion (6) along the axis direction, the inner diameters of the second cylindrical cavities (7) are not equal, the diameters of the outer peripheral surfaces of the first connecting portion (5) and the second connecting portion (6) are equal to the difference d2 between the inner diameters of the corresponding second cylindrical cavities (7), and d1 and d2 are also equal.
4. The motor shaft suitable for the new energy automobile of claim 3, characterized in that: oblique splines (51) are uniformly distributed on the outer peripheral surface of the first connecting portion (5), the helical angle of the oblique splines (51) is 21 degrees to 51' -22 degrees, and the tooth width of the oblique splines (51) is 42-43 mm.
5. The motor shaft suitable for the new energy automobile of claim 3, characterized in that: the outer peripheral surface of the second connecting portion (6) is uniformly distributed with straight splines (61), and the tooth width of the straight splines (61) is 16-17 mm.
6. The motor shaft suitable for the new energy automobile of claim 2, characterized in that: first bearing installation department (5) with the junction of rotor connecting portion (3) is formed with first shaft shoulder (8), first bearing installation department (5) with the junction of first connecting portion (5) is formed with second shaft shoulder (9), second bearing installation department (2) with be formed with third shaft shoulder (10) and fourth shaft shoulder (11) between rotor connecting portion (3), second bearing installation department (2) use third shaft shoulder (10) and fourth shaft shoulder (11) as the border, form by two concentric shafts that inside outer diameter reduces in proper order.
7. The motor shaft suitable for the new energy automobile of claim 1, characterized in that: the motor shaft is made of 25CrMo4 alloy structural steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911103090.6A CN111106707A (en) | 2019-11-12 | 2019-11-12 | Motor shaft suitable for new energy automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911103090.6A CN111106707A (en) | 2019-11-12 | 2019-11-12 | Motor shaft suitable for new energy automobile |
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| Publication Number | Publication Date |
|---|---|
| CN111106707A true CN111106707A (en) | 2020-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911103090.6A Pending CN111106707A (en) | 2019-11-12 | 2019-11-12 | Motor shaft suitable for new energy automobile |
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| Country | Link |
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| CN (1) | CN111106707A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001121241A (en) * | 1999-10-27 | 2001-05-08 | Aida Eng Ltd | Hollow shaft and producting method thereof |
| CN206617470U (en) * | 2017-03-17 | 2017-11-07 | 无锡市神力齿轮冷挤有限公司 | Drive gear detachable one-way clutch |
| CN108406245A (en) * | 2018-05-28 | 2018-08-17 | 重庆创精温锻成型有限公司 | A kind of lightweight new-energy automobile driving motor shaft production method |
| CN207926351U (en) * | 2018-03-22 | 2018-09-28 | 重庆创精温锻成型有限公司 | Motor shaft suitable for new-energy automobile |
| CN109109640A (en) * | 2018-07-10 | 2019-01-01 | 广西汽车集团有限公司 | A kind of coaxial-type independent electrical drives bridge and electric car |
-
2019
- 2019-11-12 CN CN201911103090.6A patent/CN111106707A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001121241A (en) * | 1999-10-27 | 2001-05-08 | Aida Eng Ltd | Hollow shaft and producting method thereof |
| CN206617470U (en) * | 2017-03-17 | 2017-11-07 | 无锡市神力齿轮冷挤有限公司 | Drive gear detachable one-way clutch |
| CN207926351U (en) * | 2018-03-22 | 2018-09-28 | 重庆创精温锻成型有限公司 | Motor shaft suitable for new-energy automobile |
| CN108406245A (en) * | 2018-05-28 | 2018-08-17 | 重庆创精温锻成型有限公司 | A kind of lightweight new-energy automobile driving motor shaft production method |
| CN109109640A (en) * | 2018-07-10 | 2019-01-01 | 广西汽车集团有限公司 | A kind of coaxial-type independent electrical drives bridge and electric car |
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Application publication date: 20200505 |