Speed reducer, electric drive system and electric automobile
阅读说明:本技术 一种减速器、电驱动系统以及电动汽车 (Speed reducer, electric drive system and electric automobile ) 是由 王燕 魏沈平 付林 郭振 李森 于 2020-05-21 设计创作,主要内容包括:本发明公开一种减速器、电驱动系统以及电动汽车,所述减速器包括壳体、传动组件以及连接轴,其中,壳体具有容纳腔,容纳腔设有第一通孔;传动组件设于容纳腔,传动组件包括一级齿轮,一级齿轮包括减速器输入轴齿轮,减速器输入轴齿轮用以连接驱动电机;连接轴设于容纳腔,连接轴具有相对设置的第一端和第二端,连接轴的第一端与减速器输入轴齿轮固定连接,连接轴的第二端用以经第一通孔与驱动电机输出轴通过花键连接。本发明通过设置连接轴,使得减速器输入轴远离驱动电机输出轴与减速器之间的花键连接部分,从而避免由于花键震动造成减速器一级齿轮阶次NVH产生或放大,改善了电动汽车的NVH性能,提高了整车舒适性。(The invention discloses a speed reducer, an electric drive system and an electric automobile, wherein the speed reducer comprises a shell, a transmission assembly and a connecting shaft, wherein the shell is provided with an accommodating cavity, and the accommodating cavity is provided with a first through hole; the transmission assembly is arranged in the accommodating cavity and comprises a primary gear, the primary gear comprises a speed reducer input shaft gear, and the speed reducer input shaft gear is used for being connected with a driving motor; the connecting shaft is located and is held the chamber, and the connecting shaft has relative first end and the second end that sets up, and the first end and the reduction gear input shaft gear fixed connection of connecting shaft, the second end of connecting shaft are used for passing through splined connection through first through-hole and driving motor output shaft. According to the invention, the input shaft of the speed reducer is far away from the spline connection part between the output shaft of the driving motor and the speed reducer by arranging the connecting shaft, so that the generation or amplification of primary gear order NVH of the speed reducer caused by spline vibration is avoided, the NVH performance of the electric automobile is improved, and the comfort of the whole automobile is improved.)
1. A speed reducer, comprising:
the shell is provided with an accommodating cavity, and the accommodating cavity is provided with a first through hole;
the transmission assembly is arranged in the accommodating cavity and comprises a primary gear, the primary gear comprises a speed reducer input shaft gear, and the speed reducer input shaft gear is used for being connected with a driving motor; and the number of the first and second groups,
the connecting shaft is arranged in the accommodating cavity, the connecting shaft is provided with a first end and a second end which are oppositely arranged, the first end of the connecting shaft is fixedly connected with the gear of the input shaft of the speed reducer, and the second end of the connecting shaft is used for being connected with the output shaft of the driving motor through a spline by the first through hole.
2. The reducer according to claim 1, wherein the connecting shaft is disposed in a ring shape, the input shaft of the reducer is sleeved at a first end of the connecting shaft, and a second end of the connecting shaft is used for being sleeved at an output shaft of the driving motor and connected with the output shaft of the driving motor through a spline.
3. The reducer according to claim 1, wherein the housing includes a front housing and a rear housing arranged in a front-rear direction, an outer surface of the front housing is provided with a mounting area for mounting the driving motor, the mounting area is provided with a recess, and the first through hole is opened in a bottom wall of the recess.
4. The decelerator according to claim 3, wherein the installation region is provided with a connection flange portion formed at a periphery of the receding groove, the connection flange portion being used to connect the driving motor, and a shape of the receding groove being adapted to a shape of the driving motor toward one side of the front housing.
5. The speed reducer of claim 3, wherein the primary gear further comprises a first transfer gear in gear engagement with the speed reducer input shaft;
the transmission assembly further comprises a secondary gear, the secondary gear comprises a second transmission gear and a main reduction gear, the second transmission gear is coaxially arranged with the first transmission gear, the second transmission gear and the first transmission gear are sequentially arranged at intervals in the direction from front to back, and the main reduction gear is meshed with the second transmission gear.
6. The speed reducer of claim 3, further comprising a differential coupled to the main reduction gear, wherein the differential and the main reduction gear are arranged in a sequential order in a front-to-rear direction.
7. The speed reducer of claim 6, wherein the front housing has a receiving groove formed at a position corresponding to the differential to protrude in a direction away from the receiving cavity.
8. The speed reducer of claim 6, further comprising a speed reducer output half shaft connected to the differential, wherein the front housing has a second through-hole formed therein at a location corresponding to the speed reducer output half shaft.
9. An electric drive system comprising a drive motor and a reducer according to any one of claims 1 to 8.
10. An electric vehicle comprising an electric drive system as claimed in claim 9.
Technical Field
The invention relates to the technical field of electric automobiles, in particular to the technical field of speed reducers, and specifically relates to a speed reducer, an electric drive system and an electric automobile.
Background
With the gradual improvement of the performance requirements of the electric automobile on NVH (Noise, Vibration and Harshness, Noise, Vibration, Harshness, NVH for short), the requirements of users on the Noise in the automobile are higher and higher, wherein the Noise generated by the electric drive system is one of the noises which are most likely to cause complaints in the sound of the electric automobile, and the Noise generated by the speed reducer is the main Noise in the electric drive system. The structural style of present reduction gear for electric automobile adopts the second grade single reduction gear usually, and the reduction gear passes through splined connection with driving motor, and this kind of mode causes driving motor and the produced noise of retarder connection very easily to be amplified by reduction gear one-level gear, is unfavorable for electric drive system NVH's reduction, leads to influencing whole car travelling comfort.
Disclosure of Invention
The invention mainly aims to provide a speed reducer, an electric drive system and an electric automobile, and aims to improve the NVH performance of the electric automobile.
To achieve the above object, the present invention provides a speed reducer, including:
the shell is provided with an accommodating cavity, and the accommodating cavity is provided with a first through hole;
the transmission assembly is arranged in the accommodating cavity and comprises a primary gear, the primary gear comprises a speed reducer input shaft gear, and the speed reducer input shaft gear is used for being connected with a driving motor; and the number of the first and second groups,
the connecting shaft is arranged in the accommodating cavity, the connecting shaft is provided with a first end and a second end which are oppositely arranged, the first end of the connecting shaft is fixedly connected with the gear of the input shaft of the speed reducer, and the second end of the connecting shaft is used for being connected with the output shaft of the driving motor through a spline by the first through hole.
Optionally, the connecting shaft is annularly arranged, the gear of the input shaft of the speed reducer is sleeved at the first end of the connecting shaft, and the second end of the connecting shaft is used for being sleeved at the output shaft of the driving motor and is connected with the output shaft of the driving motor through a spline.
Optionally, the casing includes along procapsid and the back casing of front and back to setting up, the surface of procapsid is equipped with and is used for supplying the installation area of driving motor installation, the installation area is equipped with the recess of stepping down, first through-hole offer in the diapire of the recess of stepping down.
Optionally, the mounting region is provided with a connecting flange portion formed on the periphery of the abdicating groove, the connecting flange portion is used for connecting the driving motor, and the shape of the abdicating groove is matched with the shape of the driving motor facing one side of the front shell.
Optionally, the primary gear further comprises a first transmission gear, and the first transmission gear is in gear engagement with the input shaft of the speed reducer;
the transmission assembly further comprises a secondary gear, the secondary gear comprises a second transmission gear and a main reduction gear, the second transmission gear is coaxially arranged with the first transmission gear, the second transmission gear and the first transmission gear are sequentially arranged at intervals in the direction from front to back, and the main reduction gear is meshed with the second transmission gear.
Optionally, the reduction gear still includes differential mechanism, differential mechanism with the main reduction gear is connected, just differential mechanism with the main reduction gear is arranging the setting in proper order in the direction from front to back.
Optionally, a position of the front housing corresponding to the differential is provided with an accommodating groove protruding towards a direction away from the accommodating cavity.
Optionally, the speed reducer further includes a speed reducer output half shaft, the speed reducer output half shaft is connected to the differential, and a second through hole is formed in the front housing at a position corresponding to the speed reducer output half shaft.
The invention also proposes an electric drive system comprising a drive motor and a speed reducer, said speed reducer comprising:
the shell is provided with an accommodating cavity, and the accommodating cavity is provided with a first through hole;
the transmission assembly is arranged in the accommodating cavity and comprises a primary gear, the primary gear comprises a speed reducer input shaft gear, and the speed reducer input shaft gear is used for being connected with a driving motor; and the number of the first and second groups,
the connecting shaft is arranged in the accommodating cavity, the connecting shaft is provided with a first end and a second end which are oppositely arranged, the first end of the connecting shaft is fixedly connected with the gear of the input shaft of the speed reducer, and the second end of the connecting shaft is used for being connected with the output shaft of the driving motor through a spline by the first through hole.
The invention also proposes an electric vehicle comprising an electric drive system including a drive motor and a speed reducer, said speed reducer comprising:
the shell is provided with an accommodating cavity, and the accommodating cavity is provided with a first through hole;
the transmission assembly is arranged in the accommodating cavity and comprises a primary gear, the primary gear comprises a speed reducer input shaft gear, and the speed reducer input shaft gear is used for being connected with a driving motor; and the number of the first and second groups,
the connecting shaft is arranged in the accommodating cavity, the connecting shaft is provided with a first end and a second end which are oppositely arranged, the first end of the connecting shaft is fixedly connected with the gear of the input shaft of the speed reducer, and the second end of the connecting shaft is used for being connected with the output shaft of the driving motor through a spline by the first through hole.
According to the technical scheme provided by the invention, the connecting shaft is arranged, so that the input shaft of the speed reducer is far away from the spline connection part between the output shaft of the driving motor and the speed reducer, the generation or amplification of primary gear order NVH of the speed reducer caused by spline vibration is avoided, the NVH of an electric drive system is reduced, the NVH performance of an electric automobile is improved, and the comfort of the whole automobile is improved.
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 structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of a retarder provided in the present invention;
FIG. 2 is a schematic diagram of a portion of the retarder provided in FIG. 1;
FIG. 3 is a schematic view of the connection between the reducer and the driving motor provided in FIG. 1;
fig. 4 is another angular view of fig. 3.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The structural style of present reduction gear for electric automobile adopts the second grade single reduction gear usually, and the reduction gear passes through splined connection with driving motor, and this kind of mode causes driving motor and the produced noise of retarder connection very easily to be amplified by reduction gear one-level gear, is unfavorable for electric drive system NVH's reduction, leads to influencing whole car travelling comfort.
In view of the above, the present invention provides an electric vehicle, which includes an electric drive system, the electric drive system includes a
In the technical scheme provided by the invention, the connecting
Referring to fig. 3, in the present embodiment, the connecting
Further refer to fig. 1 to 3, the casing includes along preceding backward to the
Driving
In general, the
Further, referring to fig. 2 to 4, in one embodiment, the
Further, a
In this embodiment, the
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
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