CN115811176A - Electric drive system and vehicle with same - Google Patents

Abstract

The invention provides an electric drive system and a vehicle with the same. An electric drive system includes: a housing; the cover plate is connected with the shell, and the cover plate and the shell enclose an installation space; the driving motor is provided with a motor output shaft, and at least part of the motor output shaft extends into the installation space; the input shaft is arranged in the installation space, the input shaft sleeve is arranged outside the motor output shaft, at least one ball bearing is arranged on the input shaft, a first limiting part is arranged between the ball bearing and the shell, a second limiting part is arranged between the ball bearing and the cover plate, the first limiting part is used for radially limiting the ball bearing, and the second limiting part is used for axially limiting the ball bearing. By applying the scheme, when the ball bearing is at a high rotating speed or under a large load condition, the second limiting part and the first limiting part can rotate, so that the sliding friction is avoided, the rolling friction replaces the sliding friction, the abrasion of the shell is avoided, the efficiency is improved, and the noise and reliability problems caused by abrasion are avoided.

Description

Electric drive system and vehicle with same

technical field

The invention relates to the technical field of vehicle electric drive system design, in particular, to an electric drive system and a vehicle with the same.

Background technique

Under the background of energy and environmental crisis, automobile companies all over the world are vigorously promoting the research and development of new energy vehicles. Compared with traditional fuel vehicles, electric vehicles have the advantages of zero emission and low noise. With the development of electric vehicles, the market has increasingly higher requirements for its cruising range and power performance. This not only needs to improve the performance of the battery, but also needs to increase the efficiency and speed of the electric drive system to support electric vehicles to meet market requirements. . The speed of the electric drive system of an electric vehicle often reaches 15,000 rpm or even 20,000 rpm, while the maximum speed of a fuel vehicle engine generally does not exceed 6,000 rpm. The maximum speed of the electric vehicle drive system is 2 to 4 times that of the fuel vehicle electric drive system. The problem of reduced efficiency and reliability due to high speed has always been a technical problem that needs to be solved in the electric drive industry.

The power output by the motor can only drive the vehicle forward after being transmitted through the reducer. During the working process, the input shaft of the electric drive system bears a high speed of up to 15,000rpm or even 20,000rpm on the one hand, and on the other hand, it also bears large radial and axial forces. For the bearing on the input shaft, Bearing high speed and heavy load at the same time, the bearings on both sides of the input shaft will rotate relative to the housing, which will lead to a decrease in transmission efficiency on the one hand, and on the other hand, this relative rotation will cause wear and tear on the housing hole, and the hole diameter will become larger, resulting in The working stability of the input shaft bearing further deteriorates, and even causes damage to the gears and bearings.

In the existing motor drive system, after the motor outputs high-speed power, the power is transmitted to the input shaft through the rigid connection between the motor output shaft and the input shaft, and the input shaft then transmits the power to the next-stage gear mechanism. During the process, while the input shaft rotates at high speed, it also receives the axial and radial force exerted by the lower gear.

In a general electric drive reduction mechanism, the input shaft is supported by ball bearings on both sides, and the axial force will be transmitted to the ball bearing on one side, and then the ball bearing will be transmitted to the housing through the left (or right) end face, and the radial force will be transmitted to the ball bearing on one side. Through the outer rings of ball bearings on both sides, it is directly transmitted to the housing. Ideally, the bearings only perform simple rolling to support the rotation of the input shaft. The end faces of the left and right outer rings of the bearing and the outer diameter of the outer ring are static with the housing. contact, no relative slippage occurs, but when the load and speed are relatively large, the ball bearing will inevitably slip relative to the shell, resulting in a decrease in efficiency. In addition, in the case of long-term slippage, the shell will appear Inaccurate positioning of the ball bearings after wear and tear will lead to noise problems in the electric drive operation, which will seriously cause damage to the electric drive system.

For the above technical problems, no effective solution has been proposed yet.

Contents of the invention

The main purpose of the present invention is to provide an electric drive system and a vehicle having the same, so as to solve the problem of noise in the operation of the electric drive system in the prior art.

In order to achieve the above object, according to one aspect of the present invention, an electric drive system is provided, including: a housing; a cover plate, the cover plate is connected to the housing, and the cover plate and the housing are surrounded by an installation space; a driving motor, which drives The motor has a motor output shaft, at least part of the motor output shaft extends into the installation space; an input shaft, the input shaft is arranged in the installation space, the input shaft is sleeved outside the motor output shaft, and at least one ball bearing is arranged on the input shaft, A first limiter is set between the ball bearing and the housing, and a second limiter is set between the ball bearing and the cover plate. The first limiter is used to radially limit the ball bearing, and the second limiter The parts are used to axially limit the ball bearings.

Further, the outer ring of the ball bearing is provided with a flanging ring, the flanging ring has an outer peripheral surface and an outer end surface, the outer peripheral surface extends along the axial direction of the input shaft, and the outer end surface extends along the radial direction of the input shaft, A first limiting member is arranged between the outer end surface of the flanged collar and the housing, and a second limiting member is arranged between the outer peripheral surface of the flanged collar and the cover plate.

Further, the first limiting member is a column bearing.

Furthermore, a connection hole is opened on the casing, the outer ring of the column bearing is connected with the casing through the connection hole, and the rolling elements of the column bearing are sleeved on the outer peripheral surface of the flanged ring.

Further, the second limiting member is a thrust bearing.

Further, two ends of the input shaft are respectively provided with a ball bearing.

Further, the input shaft is connected to the output shaft of the motor through a spline.

Further, the cover plate is connected with the casing by bolts.

Further, there are two cover plates, the two ends of the casing are respectively connected to one cover plate, and an installation space is enclosed between the casing and the two cover plates.

According to another aspect of the present invention, a vehicle is provided, the vehicle has an electric drive system, and the electric drive system is the above electric drive system.

Applying the technical solution of the present invention, the ball bearing is limited in the axial direction by the second limiter, and in the radial direction by the first limiter, and the rolling resistance of the first limiter and the second limiter is set It is greater than the rolling resistance of the ball bearing. The second limiter and the first limiter will not work during normal operation. The positioning member and the first limiting member will rotate to avoid sliding wear, and replace sliding friction with rolling friction to avoid wear of the housing, which not only improves efficiency, but also avoids noise and reliability problems caused by wear.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

FIG. 1 shows a schematic structural view of a first embodiment of an electric drive system according to the present invention;

Figure 2 shows an enlarged schematic view of part A in Figure 1;

Fig. 3 shows a schematic structural diagram of a second embodiment of the electric drive system according to the present invention;

Fig. 4 shows a schematic structural diagram of an embodiment of the input shaft according to the present invention.

Wherein, the above-mentioned accompanying drawings include the following reference signs:

41. Housing;

51. Drive motor; 61. Motor bearing; 71. Motor output shaft;

31. Input shaft;

11. Bolt; 12. Cover plate;

13. Thrust bearing; 14. Column bearing; 15. Ball bearing; 16. Flange ring.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. These example embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of these exemplary embodiments to those of ordinary skill in the art. The thicknesses of layers and regions are indicated, and the same reference numerals are used to designate the same devices, and thus their descriptions will be omitted.

As shown in FIG. 1 to FIG. 4 , according to a specific embodiment of the present application, an electric drive system is provided.

The electric drive system includes a housing 41, a cover plate 12, a driving motor 51 and an input shaft 31. The cover plate 12 is connected to the housing 41, and the cover plate 12 and the housing 41 form an installation space; the driving motor 51 has a motor output shaft 71 , at least part of the motor output shaft 71 extends into the installation space; the input shaft 31 is arranged in the installation space, the input shaft 31 is sleeved outside the motor output shaft 71, and at least one ball bearing 15 is arranged on the input shaft 31, the ball bearing 15 and the housing 41 is provided with a first limiter, between the ball bearing 15 and the cover plate 12 is provided with a second limiter, the first limiter is used to radially limit the ball bearing 15, the second limiter is The two limiting parts are used for axially limiting the ball bearing 15 .

Applying the technical solution of this embodiment, the ball bearing 15 is limited by the second limiter in the axial direction, and limited by the first limiter in the radial direction, and the first limiter and the second limiter are set. The rolling resistance is greater than the rolling resistance of the ball bearing 15, and the second limiter and the first limiter will not work during normal operation. When the ball bearing 15 is in a high-speed or heavy-load condition, there is a tendency to slip and wear with the surrounding parts , the second limiter and the first limiter will rotate to avoid sliding wear, and replace sliding friction with rolling friction to avoid wear of the shell, which not only improves efficiency, but also avoids noise and reliability caused by wear question.

In an exemplary embodiment of the present application, the motor output shaft 71 is provided with a motor bearing 61 .

Further, the outer ring of the ball bearing 15 is provided with a flanged collar 16, the flanged collar 16 has an outer peripheral surface and an outer end surface, the outer peripheral surface extends along the axial direction of the input shaft 31, and the outer end surface extends along the diameter of the input shaft 31. Extending in the direction, a first limiting member is provided between the outer end surface of the flanged collar 16 and the housing 41 , and a second limiting member is provided between the outer peripheral surface of the flanged collar 16 and the cover plate 12 . The arrangement of the flanging ring can facilitate the connection between the ball bearing 15 and the first limiting member and the second limiting member, and at the same time enhance the load capacity of the ball bearing 15 .

Specifically, the first limiting member is a column bearing 14 . It should be noted that the column bearing 14 in this embodiment is a cylindrical bearing, and the cylindrical bearing has a larger radial load capacity and is more suitable for high-speed rotation.

In combination with the foregoing embodiments, preferably, the column bearing 14 can move left and right on the flanged collar 16 without axial limitation, and the ball bearing 15 in this embodiment is axially limited by the second limiting member.

Furthermore, a connecting hole is opened on the housing 41 , the outer ring of the column bearing 14 is connected with the housing 41 through the connecting hole, and the rolling elements of the column bearing 14 are sleeved on the outer peripheral surface of the flanged ring 16 .

In an exemplary embodiment of the present application, the input shaft 31 is in interference connection with the inner ring of the ball bearing 15, the outer ring of the ball bearing 15 is in interference connection with the inner wall of the flanged ring 16, and the rolling elements of the column bearing 14 are respectively Sleeved on the outer peripheral surface of the flanged collar 16 , the outer ring of the column bearing 14 is in interference connection with the connecting hole of the housing 41 .

Specifically, the second limiting member is a thrust bearing 13 . Adopting the thrust bearing 13 can facilitate the realization of the axial limiting effect on the ball bearing 15 .

Specifically, one side of the thrust bearing 13 is in contact with the outer end surface of the flanged collar 16 , and the other side is in contact with the inner surface of the cover plate 12 .

Further, two ends of the input shaft 31 are respectively provided with a ball bearing 15 . Such setting can make both ends of the input shaft 31 receive the active force of the ball bearing 15 at the same time, realize the force balance of the input shaft 31, and make the system structure more stable.

Specifically, the input shaft 31 is connected to the motor output shaft 71 through a spline. Splines can transmit large torque and are more suitable for high-speed rotating conditions.

In this embodiment, the splines may include internal splines disposed inside the input shaft 31 and external splines disposed outside the motor output shaft 71 .

Further, the cover plate 12 is connected to the housing 41 through bolts 11 . In this embodiment, the bolts 11 are fastening bolts to realize the locking connection between the cover plate 12 and the housing 41 and avoid loosening and falling off during the operation of the system.

Further, there are two cover plates 12 , and the two ends of the housing 41 are respectively connected to one cover plate 12 , and an installation space is enclosed between the housing 41 and the two cover plates 12 . By arranging two cover plates 12, the maintenance and replacement of the input shaft 31 and its related components in the installation space can be facilitated.

When the electric drive system in the above embodiment is working, the driving motor 51 transmits the power to the motor output shaft 71, and the motor output shaft 71 transmits the power to the input shaft 31 through the spline, and the input shaft 31 transmits the power to the next stage Gears, the input shaft 31 will be subjected to axial and radial forces during the power transmission process, and the left and right ends of the input shaft 31 are respectively supported in the radial direction by high-speed ball bearings 15, flanged rings 16 and column bearings 14. The housing 41 is axially limited on the cover plate 12 by the thrust bearing 13 , and the two cover plates 12 are fixed on the housing 41 by bolts 11 .

In this embodiment, when the input shaft 31 is used as the input shaft of the reducer, by eliminating the relative rotation and relative sliding between the ball bearing 15 and the housing 41 under high speed and heavy load, the transmission efficiency is improved, and the ball bearing 15 is also operated. It is more stable and reduces the risk of failure of bearings and gears, thus making the electric drive system more efficient and more stable and reliable.

According to another specific embodiment of the present application, a vehicle is provided, the vehicle has an electric drive system, and the electric drive system is the above-mentioned electric drive system. The vehicle in this embodiment may be a pure electric vehicle, a hybrid vehicle, or the like.

For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe the The spatial positional relationship between one device or feature shown and other devices or features. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, devices described as "above" or "above" other devices or configurations would then be oriented "beneath" or "above" the other devices or configurations. under other devices or configurations". Thus, the exemplary term "above" can encompass both an orientation of "above" and "beneath". The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

In addition to the above, it also needs to be explained that "one embodiment", "another embodiment", "embodiment" and the like mentioned in this specification refer to specific features, structures or Features are included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure or characteristic is described in combination with any embodiment, it is claimed that implementing such feature, structure or characteristic in combination with other embodiments also falls within the scope of the present invention.

In the foregoing embodiments, the descriptions of each embodiment have their own emphases, and for parts not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. An electric drive system, characterized in that, comprising: housing (41); a cover plate (12), the cover plate (12) is connected to the housing (41), and the cover plate (12) and the housing (41) enclose an installation space; A driving motor (51), the driving motor (51) has a motor output shaft (71), at least part of the motor output shaft (71) extends into the installation space; The input shaft (31), the input shaft (31) is arranged in the installation space, the input shaft (31) is sleeved on the outside of the motor output shaft (71), the input shaft (31) At least one ball bearing (15) is provided, a first stopper is provided between the ball bearing (15) and the housing (41), the ball bearing (15) and the cover plate (12) A second limiter is arranged between them, the first limiter is used to radially limit the ball bearing (15), and the second limiter is used to limit the ball bearing (15) Axial limit. 2. The electric drive system according to claim 1, characterized in that, the outer ring of the ball bearing (15) is provided with a flanging collar (16), and the flanging collar (16) has an outer peripheral surface and The outer end surface, the outer peripheral surface is extended along the axial direction of the input shaft (31), the outer end surface is extended along the radial direction of the input shaft (31), the flanged collar (16) The first stopper is provided between the outer end surface of the shell (41) and the outer peripheral surface of the flanged collar (16) and the cover plate (12). Two limit pieces. 3. The electric drive system according to claim 2, characterized in that, the first limiting member is a column bearing (14). 4. The electric drive system according to claim 3, characterized in that a connection hole is opened on the housing (41), and the outer ring of the column bearing (14) is connected to the housing through the connection hole. (41) connection, the rolling body of the column bearing (14) is sleeved on the outer peripheral surface of the flanged collar (16). 5. The electric drive system according to claim 1 or 3, characterized in that, the second limiting member is a thrust bearing (13). 6. The electric drive system according to claim 1, characterized in that, one ball bearing (15) is provided at both ends of the input shaft (31). 7. The electric drive system according to claim 1, characterized in that, the input shaft (31) is connected to the motor output shaft (71) through a spline. 8. The electric drive system according to claim 1, characterized in that, the cover plate (12) is connected to the housing (41) by bolts (11). 9. The electric drive system according to claim 1, characterized in that there are two cover plates (12), and the two ends of the housing (41) are respectively connected to one of the cover plates (12), The installation space is enclosed between the housing (41) and the two cover plates (12). 10. A vehicle, the vehicle having an electric drive system, characterized in that the electric drive system is the electric drive system according to any one of claims 1-9.

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