CN218882904U - Transmission mechanism, electric drive mechanism and electric vehicle - Google Patents

Abstract

The application discloses drive mechanism, electric drive mechanism and electric motor car. This drive mechanism includes: a primary planet row and a secondary planet row; the primary sun gear of the primary planet row is used for being connected with the driving piece to input power; a secondary gear ring of the secondary planet row is fixedly connected with a primary planet carrier of the primary planet row, the primary planet carrier divides power to the secondary gear ring, and the secondary gear ring is used as a power output end; and the secondary sun gear of the secondary planet row is connected with the primary gear ring of the primary planet row, and the primary gear ring divides power to the secondary sun gear, so that the secondary sun gear transmits the divided power to the secondary gear ring for confluence. Through the mode, the transmission ratio of the transmission mechanism can be improved, and the size of the transmission mechanism is reduced.

Description

Transmission mechanism, electric drive mechanism and electric vehicle

Technical Field

The application relates to the technical field of electric vehicles, in particular to a transmission mechanism, an electric driving mechanism and an electric vehicle.

Background

Today's new energy automobile rapid development, electric drive mechanism plays the effect such as speed reduction increase torsion, drive vehicle travel, recovery energy as the important power component structure in the electric automobile. With the development of market trend, the electric driving mechanism is required to have smaller weight and volume, and the torque is required to be larger and larger.

Although the traditional parallel shaft type electric driving mechanism has a simple structure, the volume is increased along with the increase of the torque, and the requirements of large torque, small volume and low weight are difficult to meet. Although the parallel shaft electric driving mechanism adopting the planet row structure can greatly increase the speed reduction ratio and reduce the volume, the parallel shaft electric driving mechanism also has the following defects: the shell needs to be added with a gear ring fixing point, so that the circular half-circumference of the shell is larger, the volume of the shell is increased, the complexity of the shell is increased, and the shell is difficult to process; and the influence of the diameter of the gear ring on the assembly relation needs to be considered, so that the design scheme is limited.

SUMMERY OF THE UTILITY MODEL

The application provides a transmission mechanism, a power mechanism and an electric vehicle, which can improve the transmission ratio of the transmission mechanism and reduce the volume of the transmission mechanism.

The application provides a transmission mechanism. This drive mechanism includes: the primary sun gear of the primary planet row is used for being connected with the driving piece so as to input power; the power output end of the secondary planet row is connected with the power output end of the power output shaft; and the secondary sun gear of the secondary planet row is connected with the primary gear ring of the primary planet row, and the primary gear ring divides power to the secondary sun gear, so that the secondary sun gear transmits the divided power to the secondary gear ring for confluence.

The inner side of a secondary planet wheel of the secondary planet row is meshed with the secondary sun wheel, the outer side of the secondary planet wheel is meshed with the secondary gear ring, and the secondary planet wheel is arranged on a secondary planet carrier of the secondary planet row.

Wherein, drive mechanism still includes: the secondary planet wheel is arranged on the shell.

The first-stage planet gear of the first-stage planet row is connected with the first-stage planet carrier, the first-stage planet gear is meshed with the outer side of the first-stage sun gear, and the inner side of the first-stage gear ring is meshed with the first-stage planet gear.

The present application provides an electric drive mechanism. This electric drive mechanism includes: a driving member provided with a driving shaft for outputting power; the primary sun gear of the transmission mechanism is connected with the driving shaft.

Wherein, electric drive mechanism still includes: and the differential is connected with the secondary gear ring of the transmission mechanism and used for realizing a preset rotation speed difference based on the power output by the secondary gear ring.

Wherein the differential is coaxially arranged with the secondary gear ring.

Wherein, electric drive mechanism still includes: and the main reducing gear is respectively connected with the secondary gear ring and the differential mechanism and is used for realizing speed reduction.

Wherein the differential mechanism and the secondary gear ring are arranged in an offset manner.

The application provides an electric vehicle. This electric motor car includes: the above-mentioned electric drive mechanism; the electric driving mechanism is connected with the wheels and is used for driving the wheels to rotate.

The technical scheme has the advantages that the transmission mechanism comprises a primary planet row and a secondary planet row; the first-stage sun gear of the first-stage planet row is used for being connected with the driving piece to input power; a secondary gear ring of the secondary planet row is fixedly connected with a primary planet carrier of the primary planet row, the primary planet carrier divides power to the secondary gear ring, and the secondary gear ring is used as a power output end; and the secondary sun gear of the secondary planet row is connected with the primary gear ring of the primary planet row, and the primary gear ring divides power to the secondary sun gear, so that the secondary sun gear transmits the divided power to the secondary gear ring for confluence. Through the mode, the transmission mechanism can carry out split transmission on the power provided by the driving piece and output the power after confluence of the two-stage gear ring, so that the transmission ratio of the transmission mechanism can be improved; the secondary gear ring of the secondary planet row is fixedly connected with the primary planet carrier of the primary planet row, so that the secondary planet row and the primary planet row are arranged along the axis of the driving shaft, the circumferential size of the transmission mechanism can be reduced, and a larger transmission ratio can be realized in the same space; furthermore, the size of each gear and each gear ring in each stage of planetary line can be reduced through power splitting, the load of the gears and the gear rings is reduced, and the service life of the gears and the gear rings is prolonged.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic structural diagram of an embodiment of a transmission mechanism of the present application;

FIG. 2 is a schematic structural view of a primary planetary row in the transmission of the embodiment of FIG. 1;

FIG. 3 is a schematic power flow diagram of the transmission of the embodiment of FIG. 1;

FIG. 4 is a schematic structural diagram of an embodiment of an electric drive mechanism of the present application;

FIG. 5 is a schematic structural view of another embodiment of an electric drive mechanism of the present application;

fig. 6 is a schematic structural diagram of an embodiment of the electric vehicle according to the present application.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive step are within the scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.

In the embodiments of the present application, unless otherwise explicitly specified or limited, a first feature "on" or "under" a second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although the traditional parallel shaft type electric driving mechanism has a simple structure, the volume is increased along with the increase of the torque, and the requirements of large torque, small volume and low weight are difficult to meet. And the parallel shaft electric driving mechanism adopting the planet row structure can greatly increase the reduction ratio and reduce the volume. The device is particularly suitable for vehicles with severe requirements on arrangement space and weight.

However, in the prior art, the parallel shaft electric drive mechanism includes a drive motor, an input shaft gear, an intermediate shaft pinion, an output shaft gear and a differential mechanism, wherein a power output shaft of the drive motor transmits power to the input shaft gear, the input shaft gear drives the intermediate shaft pinion to rotate, the intermediate shaft pinion drives the intermediate shaft gear to rotate, the intermediate shaft gear drives the output shaft gear to rotate, and the output shaft gear transmits power to the differential mechanism; the structure has many characteristics, such as: due to the adoption of a three-axis layout, the radial space size is larger, and the compact layout is not facilitated; the three-shaft parallel shaft transmission is subjected to multiple transmission, so that the transmission stability is low, the power density ratio is low, the oil stirring loss is small, and the comprehensive efficiency is higher than that of a parallel shaft gear; parallel axis gears are carried by a single gear and cannot take on more torque.

In the related art, a parallel-axis electric transaxle with a planetary row includes a driving motor, a planetary gear reduction mechanism, a first gear, a second gear, a differential mechanism, and a housing, and has the following disadvantages: the shell needs to be added with a gear ring fixing point, and is complex and difficult to process; the influence of the diameter of the gear ring on the assembly relation needs to be considered, so that the design scheme is limited; after the gear ring fixing structure is added on the periphery of the shell, the peripheral radius of the shell is increased, and the size is increased.

To solve the above problems, the present application first proposes a transmission mechanism, as shown in fig. 1, and fig. 1 is a schematic structural diagram of an embodiment of the transmission mechanism of the present application. The transmission mechanism 10 of the present embodiment includes: a primary planet row 11 and a secondary planet row 12; the primary sun gear 111 of the primary planet row 11 is used for being connected with a driving element to input power; a secondary gear ring 121 of the secondary planet row 12 is fixedly connected with a primary planet carrier 112 of the primary planet row 11, the primary planet carrier 112 divides power to the secondary gear ring 121, and the secondary gear ring 121 serves as a power output end; the secondary sun gear 122 of the secondary planet row 12 is connected with the primary ring gear 113 of the primary planet row, and the primary ring gear 113 splits the power to the secondary sun gear 122, so that the secondary sun gear 122 transmits the split power to the secondary ring gear 121 for confluence.

Specifically, the primary sun gear 111 is fixedly connected to a driving shaft 31 of a driving member (not shown), and the driving shaft 31 drives the primary sun gear 111 to rotate.

Through the above manner, the transmission mechanism 10 of the embodiment can split and transmit the power provided by the driving member and output the power after converging through the secondary gear ring 121, so that the transmission ratio of the transmission mechanism 10 can be improved; the secondary ring gear 121 of the secondary planet row 12 is fixedly connected with the primary planet carrier 112 of the primary planet row 11, so that the secondary planet row 12 and the primary planet row 11 can be arranged along the axis of the driving shaft 31, the circumferential size of the transmission mechanism 10 can be reduced, and a larger transmission ratio can be realized in the same space; further, the volume of each gear and each gear ring in each stage of planet row can be reduced through power splitting, the load of the gears and the gear rings is reduced, and the service life of the gears and the gear rings is prolonged.

Wherein, one-level planet row 11 includes: a primary sun gear 111, a primary planet carrier 112, a primary ring gear 113 and a primary planet gear 114; the primary planet row 11 can include two primary planet gears 114.

One primary planet carrier 112 is correspondingly arranged on each primary planet carrier 114, and a plurality of primary planet carriers 112 can be fixed together or arranged separately.

In other embodiments, the primary planet row may include one or more than two primary planet wheels.

Alternatively, as shown in fig. 2, fig. 2 is a schematic structural diagram of a primary planet row in the transmission mechanism of the embodiment of fig. 1, a primary planet gear 114 of this embodiment is connected with a primary planet carrier 112 (a rotating shaft of the primary planet gear 114 is fixedly connected with the primary planet carrier 112), the primary planet gear 114 is arranged in mesh with the outer side of the primary sun gear 111, and the inner side of the primary ring gear 113 is arranged in mesh with the primary planet gear 114. The primary sun gear 111 rotates around the drive shaft 31 under the drive of the drive shaft 31, the primary sun gear 111 drives the primary planet gear 114 to rotate, the primary planet gear 114 drives the primary planet carrier 112 and the primary ring gear 113 to rotate, so that part of power is directly branched from the primary planet carrier 112 to the secondary ring gear 121, and the other part of power is branched from the primary ring gear 113 to the secondary sun gear 122, so that the secondary sun gear 122 transmits the part of power to the secondary ring gear 121, and power is combined and output in the secondary ring gear 121.

Wherein, secondary planet row 12 includes: a secondary sun gear 122, a secondary planet carrier 123, a secondary ring gear 121 and a secondary planet gear 124; the secondary planet row 12 can include two secondary planet wheels 124.

In other embodiments, the secondary planet row may include one or more secondary planets.

Alternatively, the inner side of the secondary planet gear 124 of the secondary planet row 12 of the embodiment is meshed with the secondary sun gear 122, the outer side of the secondary planet gear 124 is meshed with the secondary ring gear 121, and the secondary planet gear 124 is arranged on the secondary planet carrier 123.

The driving shaft 31 may be connected to the primary sun gear 111 through the secondary sun gear 122. The secondary sun gear 122 is in driving connection with the primary planet gears 114 via the primary ring gear 113.

The secondary sun gear 122 is driven by the primary ring gear 113 to rotate, the secondary sun gear 122 drives the secondary planet gears 124 to rotate, and the secondary planet gears 124 drive the secondary ring gear 121 to rotate, so that the power split from the primary ring gear 113 to the secondary sun gear 122 is subjected to power confluence at the secondary ring gear 121 and is output.

Each secondary planet gear 124 is provided with a secondary planet carrier 123, and a plurality of secondary planet carriers 123 can be fixed together or separately arranged.

Optionally, with continued reference to fig. 1, the transmission mechanism 10 of the embodiment further includes a housing 13, and the secondary planet gears 124 are disposed on the housing 13 (the rotating shafts of the secondary planet gears 124 are fixedly disposed on the housing 13). Since the second stage carrier 123 is fixed to the housing 13, it is no longer split.

It should be noted that fig. 1 only shows a partial structure of the housing 13, the primary planet row 11 and the secondary planet row 12 are both disposed in the housing 13, and the housing 13 is used for protecting the primary planet row 11 and the secondary planet row 12.

The shell 13 is provided with at least two through holes, and the driving shaft 31 extends from the outside of the shell 13 to the inside of the shell 13 through one through hole and is connected with the primary sun gear 111; another through hole on the housing 13 is provided corresponding to the secondary ring gear 121, so that the secondary ring gear 121 is connected as a power output end to a next-stage mechanism outside the housing 13.

This embodiment may also provide an oil seal in the through hole to increase the waterproof and the like of the housing 13.

As shown in fig. 3, fig. 3 is a schematic power flow diagram of the transmission mechanism of the embodiment of fig. 1, the primary sun gear 111 transmits the power input by the driving shaft 31 to the primary planet gears 114, the primary planet gears 114 transmit part of the power to the primary planet carrier 112, the primary planet carrier 112 transmits the part of the power to the secondary ring gear 121, the primary planet gears 114 transmit another part of the power to the primary ring gear 113, the primary ring gear 113 transmits the another part of the power to the secondary sun gear 122, the part of the power is transmitted to the secondary ring gear 121 through the secondary sun gear 122 and the secondary planet gears 124 in sequence, and the part of the power and the another part of the power are combined at the secondary ring gear 121 and output.

The present application further provides an electric driving mechanism, as shown in fig. 4, fig. 4 is a schematic structural diagram of an embodiment of the electric driving mechanism of the present application, and an electric driving mechanism 40 of the present embodiment includes: a driving member 30 and a transmission mechanism 10; wherein the driving member 30 is provided with a driving shaft 31 for outputting power; the primary sun gear 111 of the transmission mechanism 10 is connected to the drive shaft 31.

For the specific structure and operation principle of the transmission mechanism 10, reference may be made to the above embodiments, which are not described herein.

The driving member 30 may be a motor, which realizes electric driving and reduces environmental pollution.

Optionally, the electric drive mechanism 40 of the present embodiment further includes: the differential gear 41, the differential gear 41 is connected with the secondary ring gear 121 of the transmission mechanism 10 for achieving a preset rotation speed difference based on the power output from the secondary ring gear 121.

The secondary ring gear 121 transmits the merged power to the differential 41 to drive the housing of the differential 41 to rotate; the two side gears of the differential 41 link the half shafts on both sides, and give power to the wheels on both sides. The differential 41 of the electric vehicle enables left and right (or front and rear) wheels to rotate at different rotational speeds. The differential 41 is used for enabling the left wheel and the right wheel to roll at different rotating speeds when the electric vehicle runs in a turn or runs on an uneven road surface, namely ensuring that the wheels on two sides do pure rolling motion.

Alternatively, the differential 41 of the present embodiment is disposed coaxially with the secondary ring gear 121. With this structure, the circumferential dimension of the transmission mechanism 10 can be further reduced, and a larger transmission ratio can be realized in the same space.

The present application further proposes an electric driving mechanism of another embodiment, as shown in fig. 5, fig. 5 is a schematic structural diagram of another embodiment of the electric driving mechanism of the present application, and the electric driving mechanism 50 of the present embodiment includes: a driving piece 30, a transmission mechanism 10, a differential 41 and a main reducing gear 51; wherein the driving member 30 is provided with a driving shaft 31 for outputting power; the primary sun gear 111 of the transmission mechanism 10 is connected with the driving shaft 31; the differential 41 is connected with the secondary ring gear 121 of the transmission mechanism 10, and is used for realizing a preset rotation speed difference based on the power output by the secondary ring gear 121; the main reduction gear 51 is connected with the secondary ring gear 121 and the differential 41 respectively, and is used for realizing the speed reduction between the secondary ring gear 121 and the differential 41.

For the specific structure and operation principle of the transmission mechanism 10, the differential 41 and the driving member 30, reference may be made to the above embodiments, which are not described herein.

The secondary gear ring 121 transmits the power after confluence to the main reducing gear 51, and the main reducing gear 51 transmits the power to the differential 41 to drive the shell of the differential 41 to rotate; the two side gears of the differential 41 link the half shafts on both sides, and give power to the wheels on both sides. The differential 41 is used for enabling the left wheel and the right wheel to roll at different rotating speeds when the electric vehicle runs in a turn or runs on an uneven road surface, namely ensuring that the wheels on two sides do pure rolling motion.

Alternatively, the differential 41 of the present embodiment is disposed offset from the secondary ring gear 121. With this structure, the sensing rate of the electric drive mechanism 50 can be improved.

The present application further provides an electric vehicle, as shown in fig. 6, fig. 6 is a schematic structural diagram of an embodiment of the electric vehicle of the present application, an electric vehicle 60 of the present embodiment includes an electric driving mechanism 61 and wheels 62, and the electric driving mechanism 61 is connected with the wheels 62 for driving the wheels 62 to rotate.

For the specific structure and operation principle of the electric driving mechanism 61, reference may be made to the embodiment of fig. 4, which is not described herein.

In other embodiments, the detailed structure and operation principle of the electric driving mechanism can refer to the embodiment in fig. 5, which is not described herein again.

The electric vehicle 60 of the present embodiment is a pure electric vehicle, and the wheels 62 are driving wheels. The electric vehicle 60 of the present embodiment further includes a power battery 63, a vehicle body 64, and a driven wheel 65. The power battery 63 is used for providing a power source for the driving member 30; the wheels 62 drive the vehicle body 64 to move so as to drive the driven wheels 65 to rotate, and therefore the stability of the vehicle body 64 is improved.

The electric drive mechanism 61, the power battery 63, and the like are provided in the vehicle body 64, and the wheels 62 and the driven wheels 65 are provided under the vehicle body 64.

In other embodiments, the electric vehicle may be a hybrid electric vehicle.

Different from the prior art, the battery pack fixing device is used for fixing a battery pack on a carrier, and comprises a loading mechanism and a fixing mechanism, wherein the loading mechanism is used for loading the battery pack, the fixing mechanism comprises a bracket body, and the bracket body is used for accommodating the loading mechanism loaded with the battery pack and is fixed with the carrier; by the mode, the loading mechanism is connected with the carrier through the support body, and the battery pack can be loaded on the carrier. Further, be equipped with the bolt hole on the loading mechanism of this application, fixed establishment still includes the bolt pole with this body coupling of support, the bolt pole is used for when the loading mechanism holding is at the holding intracavity of support body, the second end of bolt pole inlays to be established in the bolt hole to with loading mechanism and fixed establishment fixed connection, thereby with battery package and carrier fixed connection, consequently, this application can further improve the stability between loading mechanism and the fixed establishment through bolt hole and the bolt pole on the loading mechanism, thereby further improve the stability between battery package and the carrier. Therefore, the present application can improve the stability of the battery pack on the carrier through the above-described double fixing structure. And the battery pack and the carrier can be quickly fixed through the matching of the bolt rod and the bolt hole, and the structure is simple.

The scheme of the application simplifies the design structure of the shell and reduces the manufacturing complexity and cost of the shell; after the secondary planet carrier is connected with the end face of the shell, the circumferential space of the shell is saved, and a larger transmission ratio can be realized in the same space; the scheme of the application can realize high torque density, and a plurality of planets share load instead of a single parallel shaft gear, so that larger torque can be obtained, and larger torque output can be obtained in a limited space; the layout of the scheme is more compact and is suitable for the development trend, and the planetary transmission has more surface contact, so that the transmission process is softer, the bounce is smaller, and better Noise, vibration and Harshness (NVH) performances can be obtained; compared with the same parallel shaft gear, the gear backlash is lower, and the problem of knocking abnormal sound cannot be caused; compared with parallel shaft transmission, the gear transmission operation is more stable, and better durability is brought.

The above description is only an embodiment of the present application, and is not intended to limit the scope of the present application, and all equivalent structures or equivalent processes performed by the present application and the contents of the attached drawings, which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims (10)

1. A transmission mechanism, comprising:

the primary sun gear of the primary planet row is used for being connected with the driving piece so as to input power;

the secondary planet row is characterized in that a secondary gear ring of the secondary planet row is fixedly connected with a primary planet carrier of the primary planet row, the primary planet carrier divides power to the secondary gear ring, and the secondary gear ring is used as a power output end; and the secondary sun gear of the secondary planet row is connected with the primary gear ring of the primary planet row, and the primary gear ring divides power to the secondary sun gear, so that the secondary sun gear transmits the divided power to the secondary gear ring for confluence.

2. The transmission mechanism as claimed in claim 1, characterised in that the inner sides of the secondary planet wheels of the secondary planet row are arranged in mesh with the secondary sun wheel, the outer sides of the secondary planet wheels are arranged in mesh with the secondary ring gear, and the secondary planet wheels are arranged on the secondary planet carrier of the secondary planet row.

3. The transmission mechanism as claimed in claim 2, further comprising:

the secondary planet wheel is arranged on the shell.

4. The transmission mechanism according to claim 1, wherein the primary planet wheels of the primary planet row are connected with the primary planet carrier, the primary planet wheels are arranged in a meshed manner with the outer side of the primary sun wheel, and the inner side of the primary ring gear is arranged in a meshed manner with the primary planet wheels.

5. An electric drive mechanism, comprising:

the driving piece is provided with a driving shaft and is used for outputting power;

the transmission of any one of claims 1 to 4, wherein the primary sun gear of the transmission is connected to the drive shaft.

6. The electric drive mechanism of claim 5, further comprising:

and the differential is connected with the secondary gear ring of the transmission mechanism and used for realizing a preset rotation speed difference based on the power output by the secondary gear ring.

7. The electric drive mechanism of claim 6 wherein said differential is disposed coaxially with said secondary ring gear.

8. The electric drive mechanism of claim 6, further comprising:

and the main reducing gear is respectively connected with the secondary gear ring and the differential mechanism and is used for realizing speed reduction.

9. The electric drive mechanism of claim 8 wherein said differential is offset from said secondary ring gear.

10. An electric vehicle, comprising:

an electric drive mechanism as claimed in any one of claims 5 to 9;

the electric drive mechanism is connected with the wheels and used for driving the wheels to rotate.

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