CN218780664U - Drive system and vehicle - Google Patents

Abstract

The utility model discloses a driving system and vehicle, wherein driving system includes the casing, pivot and input shaft, the casing has first shell, second shell and third shell, the pivot has first shaft section and second shaft section, the second shaft section is including supporting section and linkage segment, the input shaft has third shaft section and fourth shaft section, support the section and assemble in supporting the hole section, the linkage segment is connected in the linkage segment, because support the relative linkage segment in section and more keep away from first shaft section, consequently pivot and input shaft can realize before connecting the cooperation that the optical axis supports the cooperation, and because the external diameter that supports the section is less than the external diameter of linkage segment, consequently three bearing structure's driving system in the past relatively, under the same condition of linkage segment external diameter, this driving system need not adopt the second bearing of great external diameter, but can realize the purpose of the second shaft section of supporting the pivot simultaneously and the third shaft section of input shaft through the second bearing of less external diameter, thereby make driving system's size and weight littleer.

Description

Drive system and vehicle

Technical Field

The utility model relates to a vehicle drive technical field, in particular to actuating system and vehicle.

Background

In the related art, along with the popularization and development of new energy technologies, the rotating speed of a driving motor of an electric automobile is higher and higher, the torque is higher and higher, and the requirements on the efficiency, the reliability and the noise of a driving system are also higher and higher. At present, the driving system with a widely-applied three-bearing structure can simultaneously support an input shaft and a motor shaft for realizing a second bearing, and usually, after the spline connection, a section of optical axis matching section with a larger outer diameter than the spline matching section is designed, and the optical axis matching section is used for supporting the other end of a shaft supported by only one bearing, however, the size of the excircle of the input shaft and the size of the excircle of the bearing matching section at the position can be synchronously increased, so that the size of the matching bearing is synchronously increased, and the size and the weight of the whole driving system are also increased.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a driving system with small size and light weight.

The utility model discloses still provide the vehicle that has above-mentioned actuating system in addition.

According to the utility model discloses actuating system of first aspect embodiment includes:

the bearing assembly comprises a shell, a bearing assembly and a bearing assembly, wherein the shell is provided with a first shell part, a second shell part and a third shell part which are sequentially arranged along the axial direction, the first shell part is provided with a first bearing, the second shell part is provided with a second bearing, and the third shell part is provided with a third bearing;

the rotating shaft is provided with a first shaft section and a second shaft section, the first shaft section is supported on the first bearing, the second shaft section comprises a supporting section and a connecting section, the outer diameter of the supporting section is smaller than that of the connecting section, and the supporting section is far away from the first shaft section;

an input shaft having a third shaft section and a fourth shaft section, the third shaft section being supported by the second bearing, the fourth shaft section being supported by the third bearing, the input shaft having an axially disposed mounting hole, the mounting hole including a support hole section and a connecting hole section, the connecting hole section being disposed at the third shaft section;

the second shaft section is inserted into the mounting hole, so that the supporting section is assembled on the supporting hole section, and the connecting section is connected to the connecting hole section.

According to the utility model discloses actuating system of first aspect embodiment has following beneficial effect at least:

the driving system is characterized in that the second shaft section of the rotating shaft is inserted into the mounting hole of the input shaft, so that the supporting section of the rotating shaft is assembled in the supporting hole section of the input shaft, meanwhile, the connecting section of the rotating shaft is connected to the connecting hole section of the input shaft, because the supporting section is far away from the first shaft section relative to the connecting section, the rotating shaft and the input shaft can be supported and matched before being connected and matched, and because the outer diameter of the supporting section is smaller than that of the connecting section, compared with the driving system of the prior three-bearing structure, under the condition that the outer diameters of the connecting sections are the same, the driving system does not need to adopt a second bearing with a larger outer diameter, but can realize the purpose of simultaneously supporting the second shaft section of the rotating shaft and the third shaft section of the input shaft through a second bearing with a smaller outer diameter, and the size and the weight of the driving system are reduced.

According to some embodiments of the utility model, the input shaft is provided with first shaft shoulder, first shaft shoulder is located the third shaft leg is close to the one end of fourth shaft leg, first shaft shoulder butt in the inner circle of second bearing deviates from one side of first bearing.

According to some embodiments of the present invention, the second housing portion is provided with a support hole, the second bearing is installed in the support hole, an inner wall of the support hole has a collar, the collar butt in an outer ring orientation of the second bearing one side of the first bearing.

According to some embodiments of the present invention, a baffle is further mounted to the second shell portion, the baffle being mounted in the second shell portion deviating from an end of the first shell portion, an end portion of the baffle extending to an outside of the bearing hole, so that the baffle can abut in an outer ring of the second bearing deviates from one side of the first bearing.

According to some embodiments of the present invention, the driving system further comprises a limiting member, the limiting member is installed on the outer wall of the third shaft section, and the limiting member can abut against the inner ring toward one side of the first bearing.

According to some embodiments of the utility model, actuating system still includes the snap ring, the outer wall of third shaft section is provided with the draw-in groove, the snap ring install in the draw-in groove, the snap ring butt in the locating part deviates from one side of inner circle.

According to the utility model discloses a some embodiments, the outer wall of linkage segment is provided with the external splines, the inner wall of linkage hole section be provided with external splines complex internal splines, linkage segment splined connection in the linkage hole section.

According to the utility model discloses a some embodiments, follow the axial of pivot, the axial position center of second bearing with distance between the axial position center of external splines is a, a satisfies following relational expression: a is more than or equal to 0mm and less than or equal to 5mm.

According to the utility model discloses a some embodiments, the input shaft is provided with the lightening hole, at least part the lightening hole set up in the axial terminal surface of input shaft.

According to some embodiments of the utility model, first shell with the second shell encloses to be established and is formed with first cavity, the motor is installed to first cavity, the motor is provided with the pivot, the second shell with the third shell encloses to be established and is formed with the second cavity, the reduction gear is installed to the second cavity, the reduction gear is provided with the input shaft.

According to the utility model discloses vehicle of second aspect embodiment, include the actuating system of the first aspect embodiment of the utility model.

According to the utility model discloses vehicle of second aspect embodiment has following beneficial effect at least: the vehicle is provided with the driving system, the driving system enables the supporting section of the rotating shaft to be assembled in the supporting hole section of the input shaft by inserting the second shaft section of the rotating shaft into the mounting hole of the input shaft, meanwhile, the connecting section of the rotating shaft is connected to the connecting hole section of the input shaft, and the supporting section is far away from the first shaft section relative to the connecting section, so that the rotating shaft and the input shaft can be supported and matched before connection and matching, and the outer diameter of the supporting section is smaller than that of the connecting section, so that compared with the driving system of the prior three-bearing structure, under the condition that the outer diameters of the connecting sections are the same, the driving system does not need a second bearing with a larger outer diameter, and can achieve the purpose of simultaneously supporting the second shaft section of the rotating shaft and the third shaft section of the input shaft through a second bearing with a smaller outer diameter, so that the size and the weight of the driving system are smaller, the spatial layout of the vehicle is improved, and the performance of the vehicle is further improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic cross-sectional view of a drive system according to some embodiments of the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

fig. 3 is a schematic cross-sectional view of an input shaft according to some embodiments of the present invention;

fig. 4 is a view of an input shaft of some embodiments of the present invention along one axial end;

FIG. 5 is a view of the input shaft of FIG. 4 at the other end thereof in the axial direction;

reference numerals:

a first shell portion 100; a first bearing 110; a second bearing 120; an inner ring 121; an outer race 122; a third bearing 130;

a second shell portion 200; a convex ring 210; a baffle 220;

a third shell portion 300;

a rotating shaft 400; a first shaft section 410; a second shaft section 420; a support section 421; a connection section 422;

an input shaft 500; a third shaft segment 510; a support bore segment 511; a connecting bore section 512; a first shoulder 513; a stopper 514; a snap ring 515; an internal spline 516; a card slot 517; a lightening hole 518; a fourth shaft segment 520.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of meanings are one or more, a plurality of meanings are two or more, and the terms greater than, smaller than, exceeding, etc. are understood as excluding the number, and the terms greater than, lower than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise clear and definite limitations, words such as setting, installing, connecting, assembling, matching, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention by combining the specific contents of the technical solutions.

In the related art, along with the popularization and development of new energy technologies, the rotating speed of a driving motor of an electric automobile is higher and higher, the torque is higher and higher, and the requirements on the efficiency, the reliability and the noise of a driving system are also higher and higher. At present, the driving system with a widely-applied three-bearing structure can simultaneously support an input shaft and a motor shaft for realizing a second bearing, and usually, after the spline connection, a section of optical axis matching section with a larger outer diameter than the spline matching section is designed, and the optical axis matching section is used for supporting the other end of a shaft supported by only one bearing, however, the size of the excircle of the input shaft and the size of the excircle of the bearing matching section at the position can be synchronously increased, so that the size of the matching bearing is synchronously increased, and the size and the weight of the whole driving system are also increased.

In order to solve at least one of the above technical problems, the present invention provides a driving system having a small size and a light weight.

Referring to fig. 1 to 2, a drive system for vehicles such as vehicles according to an embodiment of the present invention includes a housing, a motor, and a speed reducer. The motor and the reducer are disposed in a casing, the casing has a first casing 100, a second casing 200 and a third casing 300 sequentially disposed along an axial direction, the first casing 100 is mounted with a first bearing 110, the second casing 200 is mounted with a second bearing 120, and the third casing 300 is mounted with a third bearing 130. The first bearing 110, the second bearing 120, and the third bearing 130 may be ball bearings, or other suitable types of bearings. The first and second case portions 100 and 200 are enclosed to form a first chamber, the second and third case portions 200 and 300 are enclosed to form a second chamber, the motor is installed in the first chamber, and the decelerator is installed in the second chamber.

The motor includes electric motor rotor, motor stator and pivot 400, and electric motor rotor cup joints the outer wall that is fixed in pivot 400 and can drive pivot 400 and rotate in the casing, and motor stator is fixed in the casing and goes round the periphery of locating electric motor rotor. The rotating shaft 400 has a first shaft section 410 and a second shaft section 420 located at two axial ends, the first shaft section 410 is supported by the first bearing 110, the second shaft section 420 includes a supporting section 421 and a connecting section 422, an outer diameter of the supporting section 421 is smaller than an outer diameter of the connecting section 422, the supporting section 421 is far away from the first shaft section 410, the supporting section 421 may be an optical axis structure, and certainly may also be a shaft section having a sunk groove or other matching structures. The outer wall of the connecting section 422 is provided with a connecting structure, which may be an external spline or other protruding structure, for example.

Referring to fig. 1 and 3, the speed reducer includes an input shaft 500, the input shaft 500 has a third shaft section 510 and a fourth shaft section 520 at both ends in the axial direction, the third shaft section 510 is supported by the second bearing 120, the fourth shaft section 520 is supported by the third bearing 130, the input shaft 500 has an axially disposed mounting hole, and the mounting hole may be a blind hole or may axially penetrate through the input shaft 500. The mounting hole includes support hole section 511 and connecting hole section 512, and connecting hole section 512 sets up in third shaft section 510, and support hole section 511 connects in the one end that connecting hole section 512 is close to fourth shaft section 520, and the inner wall of connecting hole section 512 is provided with the cooperation connection structure with external splines cooperation, and for example can be internal splines 516 or other groove structure.

When the driving system is assembled, the second shaft section 420 is inserted into the mounting hole, so that the supporting section 421 is assembled in the supporting hole section 511, and the connecting section 422 is connected to the connecting hole section 512.

The driving system inserts the second shaft section 420 of the rotating shaft 400 into the mounting hole of the input shaft 500, so that the supporting section 421 of the rotating shaft 400 is assembled in the supporting hole section 511 of the input shaft 500, and the connecting section 422 of the rotating shaft 400 is connected to the connecting hole section 512 of the input shaft 500, because the supporting section 421 is far away from the first shaft section 410 relative to the connecting section 422, the rotating shaft 400 and the input shaft 500 can realize supporting fit before connecting fit, and because the outer diameter of the supporting section 421 is smaller than that of the connecting section 422, compared with the driving system of the prior three-bearing structure, under the condition that the outer diameters of the connecting sections 422 are the same, the driving system does not need to adopt the second bearing 120 with a larger outer diameter, and can realize the purpose of simultaneously supporting the second shaft section 420 of the rotating shaft 400 and the third shaft section 510 of the input shaft 500 through the second bearing 120 with a smaller outer diameter, thereby enabling the size and weight of the driving system to be smaller.

Referring to fig. 2 and 3, it can be appreciated that in order to achieve the positioning of the second bearing 120 and to limit the movement of the second bearing 120 along the first bearing 110 towards the third bearing 130, in some embodiments of the present invention, the input shaft 500 is provided with a first shoulder 513, and the first shoulder 513 is located at an end of the third shaft section 510 close to the fourth shaft section 520. When the second bearing 120 is mounted to the set position of the third shaft segment 510, the first shoulder 513 abuts against one side, away from the first bearing 110, of the inner ring 121 of the second bearing 120, so that the mounting and positioning are realized, and meanwhile, when the second bearing 120 moves towards the third bearing 130 along the first bearing 110, the first shoulder 513 can block the second bearing 120, so that the second bearing 120 is prevented from moving, and therefore, the second bearing 120 is limited on the third shaft segment 510, and the stable work of the second bearing 120 is maintained.

Referring to fig. 2, it can be understood that, in order to prevent the second bearing 120 from being easily moved on the second housing portion 200, in some embodiments of the present invention, the second housing portion 200 has a protruding ring 210, the protruding ring 210 abuts against one side of the outer ring 122 of the second bearing 120 facing the first bearing 110, so that when the second bearing 120 moves along the direction of the third bearing 130 facing the first bearing 110, the protruding ring 210 can block the second bearing 120, preventing the second bearing 120 from moving, thereby limiting the second bearing 120 to the third section 510, which is beneficial to maintaining the stable operation of the second bearing 120. Specifically, the second housing 200 is provided with a supporting hole, the second bearing 120 is mounted at one end of the supporting hole close to the third housing 300, a protruding ring 210 is convexly formed on an inner wall of the supporting hole close to one end of the first housing 100, and the protruding ring 210 abuts against an outer ring 122 of the second bearing 120 to limit the movement of the second bearing 120.

Referring to fig. 2, it should be noted that, during the operation of the driving system, when the forward and reverse dragging conditions are switched, the axial force direction of the driving system is instantaneously changed, so that the input shaft 500 generates axial movement to impact the housing, thereby generating abnormal sound to deteriorate the noise performance of the driving system. For this reason, in some embodiments of the present invention, the baffle 220 is further installed on the second housing portion 200, the baffle 220 is installed at an end of the second housing portion 200 away from the first housing portion 100, and an end of the baffle 220 extends to an outside of the supporting hole, so that the baffle 220 can abut against the outer ring 122 of the second bearing 120. When the input shaft 500 drives the second bearing 120 to move along the direction of the first bearing 110 toward the third bearing 130, the baffle 220 can block the movement of the second bearing 120, so as to block the movement of the input shaft 500 and prevent the input shaft 500 from impacting the housing, thereby being beneficial to reducing the noise generated by the impact of the input shaft 500 on the housing and improving the noise performance of the driving system.

With reference to fig. 2, it can be understood that the input shaft 500 may also move along the third bearing 130 towards the first bearing 110 to hit the housing, and for this reason, in some embodiments of the present invention, the driving system further includes a limiting member 514, and the limiting member 514 is mounted on the outer wall of the third shaft section 510. Specifically, the limiting element 514 is installed at an end of the third shaft segment 510 away from the fourth shaft segment 520, so that the limiting element 514 can abut against a side of the inner ring 121 of the second bearing 120 facing the first bearing 110. When the input shaft 500 drives the second bearing 120 to move along the third bearing 130 toward the first bearing 110, the limiting member 514 can cooperate with the protruding ring 210 to block the movement of the second bearing 120, and further block the movement of the input shaft 500, so as to prevent the input shaft 500 from striking the housing, thereby being beneficial to reducing the noise generated by the striking of the input shaft 500 against the housing and improving the noise performance of the driving system. Specifically, the limiting element 514 may be a spacer, a retaining ring or other structures, the limiting element 514 is sleeved and fixed on the outer wall of the third shaft section 510, and an axial end of the limiting element 514 can abut against one side of the inner ring 121 of the second bearing 120.

Referring to fig. 2 and fig. 3, it can be understood that, in order to enable the limiting member 514 to bear a larger axial force, so as to more effectively block the movement of the input shaft 500, in some embodiments of the present invention, the driving system further includes a clamping ring 515, an outer wall of the third shaft segment 510 is provided with a clamping groove 517, the clamping groove 517 is located at one end of the third shaft segment 510 away from the fourth shaft segment 520, the clamping ring 515 is installed in the clamping groove 517, the clamping ring 515 can abut against one side of the limiting member 514 departing from the inner ring 121, so that the limiting member 514 can be supported by the clamping ring 515, so that the limiting member 514 can bear a larger axial force, thereby being beneficial to improving the blocking force of the limiting member 514 on the axial movement of the input shaft 500, and improving the noise performance of the driving system.

Referring to fig. 2, it should be noted that, through the above arrangement, one side of the inner ring 121 of the second bearing 120 facing the first bearing 110 is blocked by the limiting member 514, one side of the inner ring 121 of the second bearing 120 facing away from the first bearing 110 is blocked by the first shoulder 513, one side of the outer ring 122 of the second bearing 120 facing the first bearing 110 is blocked by the protruding ring 210, and one side of the outer ring 122 of the second bearing 120 facing away from the first bearing 110 is blocked by the baffle 220, so that the driving system can fully limit the second bearing 120, further increasing the limiting force on the axial movement of the input shaft 500, reducing the noise generated when the input shaft 500 axially moves to impact the housing, and greatly improving the noise performance of the driving system.

Referring to fig. 1 and 2, it can be understood that the second bearing 120 supports the third shaft segment 510 of the input shaft 500 and the second shaft segment 420 of the rotating shaft 400 simultaneously, and the torque transmission is realized between the third shaft segment 510 and the second shaft segment 420 through spline connection, in order to make the torque transmission between the third shaft segment 510 and the second shaft segment 420 smoother, in some embodiments of the present invention, along the axial direction of the rotating shaft 400, the distance between the axial position center of the second bearing 120 and the axial position center of the external spline is a, and it is satisfied that a is 0mm or more and is 5mm or less, so that the distance between the axial position center of the second bearing 120 and the axial position center of the external spline is in a smaller range, and even the axial position center of the second bearing 120 coincides with the axial position center of the external spline, thereby the runout amplitude of the third shaft segment 510 and the second shaft segment 420 can be reduced, the torque transmission between the third shaft segment 510 and the second shaft segment 420 is smoother, and it is beneficial to improve the smoothness and reliability of the operation of the driving system.

It should be noted that, along with the trend of the vehicle towards high rotating speed, the input rotating speed of the input shaft 500 of the driving system is higher and higher, and the dynamic unbalance of the input shaft 500 itself may also have a negative effect on the noise of the driving system under the high rotating speed working condition. To this end, referring to fig. 3, in some embodiments of the present invention, the input shaft 500 is provided with lightening holes 518, and the lightening holes 518 may lighten the local position of the input shaft 500 to improve the dynamic unbalance condition of the input shaft 500, thereby facilitating the improvement of the noise performance of the driving system.

Referring to fig. 4 and 5, it can be understood that, in order to further improve the dynamic unbalance condition of the input shaft 500 and reduce the influence of the lightening holes 518 on the assembly of the input shaft 500 with other components, in some embodiments of the present invention, the lightening holes 518 are provided in plurality, and at least part of the lightening holes 518 are provided on the axial end surface of the input shaft 500. By the arrangement, according to the dynamic unbalance condition of the input shaft 500, the dynamic unbalance condition of the input shaft 500 can be improved better by arranging the plurality of lightening holes 518. Meanwhile, because the end surfaces of the two axial ends of the input shaft 500 are not in contact with other components or are not stressed surfaces although in contact with the other components, the lightening holes 518 are formed in the end surfaces of the two axial ends of the input shaft 500, so that the influence of the lightening holes 518 on the assembly of the input shaft 500 and other components can be reduced as much as possible. For example, the end surface of the input shaft 500 facing the end of the first bearing 110 is provided with a plurality of lightening holes 518, and the plurality of lightening holes 518 are distributed at intervals in the circumferential direction; or the end face of the end of the input shaft 500 facing away from the first bearing 110 is provided with a plurality of lightening holes 518, and the plurality of lightening holes 518 are distributed at intervals along the circumferential direction; alternatively, the end surfaces of the two circumferential ends of the input shaft 500 are provided with a plurality of lightening holes 518, and the plurality of lightening holes 518 are distributed at intervals in the circumferential direction on the corresponding end surfaces.

The utility model discloses vehicle of second aspect embodiment, include the utility model discloses actuating system of first aspect embodiment. The drive system transmits the driving force to the wheels, thereby enabling the vehicle to run. Specifically, the vehicle may be a pure electric vehicle, or may be a hybrid vehicle, a hydrogen energy driven vehicle, or another new energy vehicle.

The driving system comprises a shell, a motor and a speed reducer. The motor and the decelerator are disposed in the case, the case has a first case portion 100, a second case portion 200, and a third case portion 300 sequentially disposed along an axial direction, the first case portion 100 is installed with a first bearing 110, the second case portion 200 is installed with a second bearing 120, and the third case portion 300 is installed with a third bearing 130. The first bearing 110, the second bearing 120, and the third bearing 130 may be ball bearings, or other suitable types of bearings. The motor includes electric motor rotor, motor stator and pivot 400, and electric motor rotor cup joints the outer wall that is fixed in pivot 400 and can drive pivot 400 and rotate in the casing, and motor stator is fixed in the casing and the periphery of locating electric motor rotor by the duplex winding. The rotating shaft 400 has a first shaft section 410 and a second shaft section 420 located at two axial ends, the first shaft section 410 is supported by the first bearing 110, the second shaft section 420 includes a supporting section 421 and a connecting section 422, the outer diameter of the supporting section 421 is smaller than that of the connecting section 422, the supporting section 421 is arranged far away from the first shaft section 410, and the outer wall of the connecting section 422 is provided with an external spline. The speed reducer comprises an input shaft 500, wherein the input shaft 500 is provided with a third shaft section 510 and a fourth shaft section 520 which are positioned at two axial ends, the third shaft section 510 is supported on a second bearing 120, the fourth shaft section 520 is supported on a third bearing 130, the third shaft section 510 is provided with an axially arranged mounting hole, and the mounting hole can be a blind hole or can penetrate through the input shaft 500 along the axial direction. The mounting hole includes support hole section 511 and connecting hole section 512, and support hole section 511 is close to fourth shaft section 520 and sets up, and the inner wall of connecting hole section 512 is provided with the internal spline 516 with external spline cooperation. When the driving system is assembled, the second shaft section 420 is inserted into the mounting hole, so that the supporting section 421 is assembled in the supporting hole section 511, and the connecting section 422 is splined to the connecting hole section 512.

Since the above-mentioned driving system is provided in the vehicle, the driving system inserts the second shaft section 420 of the rotating shaft 400 into the mounting hole of the input shaft 500, so that the supporting section 421 of the rotating shaft 400 is assembled in the supporting hole section 511 of the input shaft 500, and at the same time, the connecting section 422 of the rotating shaft 400 is in splined connection with the connecting hole section 512 of the input shaft 500, and the supporting section 421 is further away from the first shaft section 410 relative to the connecting section 422, so that the rotating shaft 400 and the input shaft 500 can be in supporting fit before being in splined fit, and since the outer diameter of the supporting section 421 is smaller than that of the connecting section 422, compared with the driving system of the prior three-bearing structure, the driving system does not need to use the second bearing 120 with a larger outer diameter, but can achieve the purpose of simultaneously supporting the second shaft section 420 of the rotating shaft 400 and the third shaft section 510 of the input shaft 500 by using the second bearing 120 with a smaller outer diameter, so that the size and weight of the driving system are smaller, which is beneficial to improving the spatial layout of the vehicle, and further improving the performance of the vehicle.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (11)

1. A drive system, comprising:

the bearing assembly comprises a shell, a bearing assembly and a bearing assembly, wherein the shell is provided with a first shell part, a second shell part and a third shell part which are sequentially arranged along the axial direction, the first shell part is provided with a first bearing, the second shell part is provided with a second bearing, and the third shell part is provided with a third bearing;

the rotating shaft is provided with a first shaft section and a second shaft section, the first shaft section is supported by the first bearing, the second shaft section comprises a supporting section and a connecting section, the outer diameter of the supporting section is smaller than that of the connecting section, and the supporting section is far away from the first shaft section;

an input shaft having a third shaft section and a fourth shaft section, the third shaft section being supported by the second bearing, the fourth shaft section being supported by the third bearing, the input shaft having an axially disposed mounting hole, the mounting hole including a support hole section and a connecting hole section, the connecting hole section being disposed at the third shaft section;

the second shaft section is inserted into the mounting hole, so that the supporting section is assembled on the supporting hole section, and the connecting section is connected to the connecting hole section.

2. The drive system of claim 1, wherein the input shaft is provided with a first shoulder at an end of the third shaft section near the fourth shaft section, the first shoulder abutting a side of the inner race of the second bearing facing away from the first bearing.

3. The drive system of claim 2, wherein the second housing portion is provided with a bearing bore in which the second bearing is mounted, an inner wall of the bearing bore having a raised ring abutting a side of an outer ring of the second bearing facing the first bearing.

4. The drive system of claim 3, wherein the second housing portion further mounts a baffle mounted at an end of the second housing portion facing away from the first housing portion, an end of the baffle extending outside the bearing hole to enable the baffle to abut against a side of the outer race of the second bearing facing away from the first bearing.

5. The drive system of claim 4, further comprising a stop mounted to an outer wall of the third shaft segment, the stop being capable of abutting a side of the inner race facing the first bearing.

6. The drive system of claim 5, further comprising a snap ring, wherein a snap groove is formed in an outer wall of the third shaft section, the snap ring is mounted in the snap groove, and the snap ring abuts against a side of the limiting member, which is away from the inner ring.

7. The drive system of claim 1, wherein an outer wall of the connecting section is provided with external splines, an inner wall of the connecting bore section is provided with internal splines which are matched with the external splines, and the connecting section is splined to the connecting bore section.

8. The drive system of claim 7, wherein a distance a between an axial position center of the second bearing and an axial position center of the external spline in the axial direction of the rotating shaft satisfies the following relationship: a is more than or equal to 0mm and less than or equal to 5mm.

9. The drive system according to any one of claims 1 to 8, wherein the input shaft is provided with lightening holes, at least part of which are provided in an axial end face of the input shaft.

10. The drive system of claim 1, wherein the first and second housing portions enclose a first chamber, the first chamber is mounted with a motor, the motor is provided with the shaft, the second and third housing portions enclose a second chamber, the second chamber is mounted with a speed reducer, the speed reducer is provided with the input shaft.

11. Vehicle, characterized in that it comprises a drive system according to any one of claims 1 to 10.

Images