Vehicle powertrain

Abstract

A vehicle power system is provided, which includes: a planetary decelerator including a decelerator case, a carrier, and a bearing, the carrier being rotatably supported to the decelerator case via the bearing; a differential including a differential case; a sliding sleeve capable of sliding in an axial direction of the vehicle power system between a first position and a second position, the power transmission path of the planetary decelerator and the differential being connected or disconnected by the sliding of the sliding sleeve; and a switching execution unit located on an axial side of the carrier, the switching execution unit being configured to drive the sliding sleeve to slide in the axial direction, the switching execution unit and the bearing being at least partially in the same axial space, the switching execution unit being located radially outside the bearing.

Description

Technical Field

[0001] This application relates to a vehicle powertrain system. Background Technology

[0002] In electric axle drive systems, a clutch is typically provided between the motor and the differential to disconnect the connection between the wheels and the motor when the motor is not in operation, thereby reducing power loss.

[0003] CN217002957U discloses a disconnectable differential for new energy vehicles, which transmits power from the gearbox to the gears via an electromagnetic clutch, thrust plate, actuator plate, sliding sleeve, and half-shaft gears. These components are arranged sequentially along the axial direction, requiring a large axial space. Furthermore, this differential is a bevel gear differential. Utility Model Content

[0004] This application aims to provide a vehicle powertrain system that makes the structure of the vehicle powertrain system compact.

[0005] This application provides a vehicle powertrain system comprising:

[0006] A planetary reducer, comprising a reducer housing, a planet carrier, and bearings, wherein the planet carrier is rotatably supported on the reducer housing relative to the reducer housing via the bearings;

[0007] A differential, the differential including a differential housing;

[0008] A sliding sleeve, capable of sliding along the axial direction of the vehicle powertrain between a first position and a second position, allows the power transmission paths of the planetary reducer and the differential to be connected or disconnected through sliding.

[0009] A switching execution unit is located on one axial side of the planetary carrier. The switching execution unit is used to drive the sliding sleeve to slide along the axial direction. The switching execution unit and the bearing are at least partially in the same axial space. The switching execution unit is located radially outside the bearing.

[0010] In at least one possible implementation, the vehicle powertrain further includes a sliding pusher that is slidably mounted relative to the planetary carrier along the axial direction, with the switching actuation unit and the sliding sleeve respectively disposed at opposite ends of the sliding pusher along the axial direction.

[0011] The sliding pusher and the planetary carrier are at least partially located in the same axial space.

[0012] In at least one possible implementation, the switching execution unit is an electromagnet configured to move the sliding pusher from the first position to the second position.

[0013] The sliding pusher passes through the planet carrier along the axial direction.

[0014] In at least one possible implementation, the vehicle powertrain further includes a reset elastic element configured to cause the sleeve to have a tendency to move from the second position to the first position.

[0015] In at least one possible implementation, the sliding sleeve is disposed between the planetary carrier and the differential housing, and by sliding the sliding sleeve along the axial direction between the first position and the second position, the differential housing and the planetary carrier can be connected or disconnected against torsion.

[0016] In at least one possible implementation, the sliding sleeve is fitted onto the planetary carrier, the sliding sleeve is provided with internal splines, the planetary carrier is provided with external splines, and the differential housing is provided with external splines.

[0017] When the sliding sleeve is in the first position, the inner spline of the sliding sleeve engages with the outer spline of the planetary carrier, the inner spline of the sliding sleeve separates from the outer spline of the differential housing, the planetary carrier and the differential housing are disconnected, and the power transmission path of the vehicle's power system is interrupted.

[0018] When the sliding sleeve is in the second position, the inner spline of the sliding sleeve simultaneously engages with both the outer spline of the planetary carrier and the outer spline of the differential housing, and the sliding sleeve connects the planetary carrier and the differential housing in a torsion-resistant manner.

[0019] In at least one possible implementation, the planetary reducer further includes a sun gear, planet gears, and a ring gear, wherein the planet gears are stepped gears, each consisting of a major diameter gear and a minor diameter gear, the major diameter gear meshing with the sun gear, and the minor diameter gear meshing with the ring gear.

[0020] The sliding sleeve and the minor diameter gear are at least partially located in the same axial space, with the sliding sleeve situated radially inside the minor diameter gear.

[0021] In at least one possible implementation, the planetary reducer further includes a gear ring, and a sliding sleeve is disposed between the gear ring and the reducer housing. By sliding the sliding sleeve along the axial direction between the first position and the second position, the gear ring and the reducer housing can be connected or disconnected against torsion.

[0022] In at least one possible implementation, the planetary carrier is connected to the differential housing, the ring gear is provided with external splines, the sliding sleeve is provided with internal and external splines, and the reducer housing is provided with internal splines.

[0023] When the sliding sleeve is in the first position, the internal spline of the sliding sleeve meshes with the external spline of the gear ring, the external spline of the sliding sleeve separates from the internal spline of the reducer housing, the gear ring and the reducer housing are disconnected, and the power transmission path of the planetary reducer is interrupted.

[0024] When the sliding sleeve is in the second position, the inner spline of the sliding sleeve meshes with the outer spline of the gear ring, the outer spline of the sliding sleeve meshes with the inner spline of the reducer housing, and the gear ring and the reducer housing are connected in a torsion-resistant manner through the sliding sleeve.

[0025] In at least one possible implementation, the outer diameter of the differential is smaller than the outer diameter of the planetary reducer, and the sliding sleeve and the differential are at least partially located in the same axial space.

[0026] By adopting the above technical solution, and by ensuring that the switching actuator and the bearing supporting the planetary carrier are at least partially in the same axial space, the switching actuator does not occupy additional axial space of the vehicle power system, thus making the vehicle power system structure compact. Attached Figure Description

[0027] Figure 1 A schematic diagram of the structure of a vehicle power system according to a first embodiment of this application is shown.

[0028] Figure 2 A schematic diagram of the vehicle power system according to the second embodiment of this application is shown.

[0029] Explanation of reference numerals in the attached figures

[0030] 1. Planetary reducer; 11. Reducer housing; 12. Sun gear; 13. Planet gears; 14. Planet carrier; 15. Ring gear; 16. Bearing; 17. Spline inside reducer housing.

[0031] 2. Differential 21. Differential housing 22. Half shaft

[0032] 3. Electromagnet

[0033] 4. Sliding sleeve

[0034] 5. Sliding pusher

[0035] 6. Reset elastic element

[0036] Axial axis Detailed Implementation

[0037] To more clearly illustrate the above-mentioned objectives, features, and advantages of this application, specific embodiments of this application are described in detail in conjunction with the accompanying drawings in this section. Besides the embodiments described in this section, this application can also be implemented in other different ways. Those skilled in the art can make corresponding improvements, modifications, and substitutions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed in this section. The scope of protection of this application should be determined by the claims.

[0038] (First Implementation)

[0039] like Figure 1 As shown, the first embodiment of this application proposes a vehicle power system, which may be an electric axle drive system, including: a motor, a planetary reducer 1, a differential 2, a switching actuator 3, a sliding sleeve 4, a sliding pusher 5, and a reset elastic member 6.

[0040] The planetary reducer 1 may include a reducer housing 11, a sun gear 12, multiple planet gears 13, a planet carrier 14, and a ring gear 15. The sun gear 12, multiple planet gears 13, planet carrier 14, and ring gear 15 may all be disposed inside the reducer housing 11. The ring gear 15 may be connected to the reducer housing 11. The sun gear 12 and planet carrier 14 are rotatably connected to the reducer housing 11 relative to it; for example, the planet carrier 14 may be supported on the reducer housing 11 by a bearing 16. The planet carrier 14 may be fitted radially outward of the sun gear 12. The multiple planet gears 13 are rotatably connected to the planet carrier 14 relative to it. The ring gear 15 may be fitted radially outward of the planet carrier 14. The planet gears 13 mesh with both the sun gear 12 and the ring gear 15.

[0041] It can be understood that the planetary reducer 1 here refers to a reducer that includes a planetary gear mechanism. The reducer may also include other forms of reduction gears or reduction stages, such as spur gears.

[0042] Optionally, planetary gear 13 can be a stepped gear, which may include a major diameter gear 131 and a minor diameter gear 132. The outer diameter of the minor diameter gear 132 is smaller than the outer diameter of the major diameter gear 131. The major diameter gear 131 and the minor diameter gear 132 are coaxially arranged and torsionally connected together (e.g., fixed connection or integral molding). The major diameter gear 131 can mesh with the sun gear 12, and the minor diameter gear 132 can mesh with the ring gear 15. The stepped gear allows the reducer 1 to achieve a larger gear ratio.

[0043] The sliding pusher 5 is slidably mounted on the planetary carrier 14 relative to the planetary carrier 14 along the axial direction A of the planetary reducer 1, and the sliding pusher 5 and the planetary carrier 14 are at least partially in the same axial space. The sliding pusher 5 can pass through the planetary carrier 14 along the axial direction A, and the ends of the sliding pusher 5 can be partially exposed from both ends of the planetary carrier 14 along the axial direction.

[0044] As an example, a portion of the structure of the sliding pusher 5 may pass through the planetary pins supporting the planetary gears 13 of the planetary carrier 14. In another example, a portion of the structure of the sliding pusher 5 may pass through the circumferential space between adjacent planetary gears 13 of the planetary carrier 14.

[0045] The switching execution unit 3 is used to drive the sliding sleeve 4 to slide along the axial direction A between a first position and a second position. The switching execution unit 3 and the sliding sleeve 4 can be respectively disposed at both ends of the sliding push member 5 along the axial direction. The switching execution unit 3 can be located on one side of the planetary carrier 14 along the axial direction. Figure 1 (on the left side), the drive sleeve 4 can be located on the other side of the planet carrier 14 along its axial direction ( Figure 1 (Right side of the middle). The switching execution unit 3 can drive the sliding sleeve 4 to slide along axis A by driving the sliding pusher 5 to slide along axis A.

[0046] The switching execution unit 3 may include an electromagnet. When the electromagnet is energized, the armature extends, which can drive the sliding pusher 5 from the first position ( Figure 1 (left side of the middle) towards the second position ( Figure 1 The right side of the middle slides, thereby sliding the pusher 5 to push the sliding sleeve 4 from the first position ( Figure 1 (left side of the middle) towards the second position ( Figure 1 (Slide on the right side of the middle).

[0047] The switching actuator 3 and the bearing 16 are at least partially located in the same axial space. The switching actuator 3 can be located radially outside the bearing 16, utilizing the radially outer space of the bearing 16. In this way, the switching actuator 3 does not occupy additional axial space, making the vehicle powertrain system compactly arranged along axis A and occupying less axial space.

[0048] The sliding sleeve 4 and the planetary gear 13 (e.g., small diameter gear 132) are at least partially located in the same axial space. The sliding sleeve 4 can be located radially inside the planetary gear 13 (e.g., small diameter gear 132), utilizing the space radially inside the small diameter gear 132. This allows for a compact layout of the vehicle powertrain along axis A, occupying less axial space.

[0049] The sliding sleeve 4 can be fitted onto the planet carrier 14. The sliding sleeve 4 may be provided with an internal spline, and the planet carrier 14 may be provided with an external spline. The internal spline of the sliding sleeve and the external spline of the planet carrier mesh, so that the sliding sleeve 4 can slide relative to the planet carrier 14 along the axial direction A, and the sliding sleeve 4 and the planet carrier 14 can rotate together. When the sliding sleeve 4 is in the first position and the second position, both the internal spline of the sliding sleeve and the external spline of the planet carrier remain engaged, and the sliding sleeve 4 and the planet carrier 14 are connected in a torsion-resistant manner.

[0050] The sliding of the sleeve 4 along axial direction A allows the power transmission path between the planetary reducer 1 and the differential 2 to be connected or disconnected. When the sleeve 4 is in the second position, the internal spline of the sleeve engages simultaneously with both the external spline of the planetary carrier and the external spline of the differential housing, thus connecting the planetary carrier 14 and the differential housing 21 torsionally. When the sleeve 4 is in the first position, the internal spline of the sleeve engages with the external spline of the planetary carrier, and the internal spline of the sleeve separates from the external spline of the differential housing, disconnecting the planetary carrier 14 and the differential housing 21, thus interrupting the power transmission path.

[0051] The differential can be a spur gear differential. The differential 2 may include a differential housing 21 and two half-shafts 22, which are used to connect the left and right wheels of the vehicle. The differential housing 21 and the planetary carrier 14 can be torsionally connected or disconnected by the movement of the sliding sleeve 4 along the axial direction A. The sun gear 12 may be fitted radially outside one of the half-shafts 22.

[0052] The differential housing 21 may be provided with an external spline of the differential housing. The external spline of the differential housing and the external spline of the planetary carrier have the same size and specifications. The internal spline of the sliding sleeve can simultaneously mesh with both the external spline of the planetary carrier and the external spline of the differential housing (when the sliding sleeve 4 is in the second position).

[0053] The reset elastic element 6 is configured to allow the sliding sleeve 4 to tend to move from the second position to the first position. The reset elastic element 6 can be a spring, and it can be disposed between the sliding sleeve 4 and the differential housing 21. The reset elastic element 6 can apply axial force to the sliding sleeve 4 from the other side ( Figure 1 The right side of the middle) points to one side of the axis ( Figure 1 The elastic force on the left side of the slide sleeve 4 allows the reset elastic element 6 to tend to move away from the differential housing 21.

[0054] When electromagnet 3 is energized, the armature of electromagnet 3 extends, which can drive the sliding pusher 5 along axis A to the other side of the axis ( Figure 1 The right side of the slide sleeve 4 slides along axis A to the other side of the axis ( ). Figure 1The right side of the slide sleeve is slid to keep the slide sleeve 4 in the second position. At this time, the inner spline of the slide sleeve engages with both the outer spline of the planet carrier and the outer spline of the differential housing. The planet carrier 14 and the housing of the differential 2 can be torsionally connected through the slide sleeve 4, so that power can be transmitted from the planetary reducer 1 to the differential.

[0055] When the electromagnet 3 is de-energized, the sliding sleeve 4 and the sliding pusher 5 can be reset along the axial direction A by the elastic member 6 to one side of the axial direction. Figure 1 Pushing the left side of the slide sleeve 4 keeps it in the first position. At this time, the internal spline of the slide sleeve only engages with the external spline of the planetary carrier, the internal spline of the slide sleeve and the external spline of the differential housing are separated, the planetary carrier 14 and the differential housing 21 are disconnected, and the power transmission path is interrupted.

[0056] It is understood that the sliding sleeve 4, planetary carrier 14, and differential housing 21 are not limited to being connected or disconnected by internal and external spline structures. For example, the sliding sleeve 4 and differential housing 21 can also be connected or disconnected by axial splines (splines set on the axial end face) or dog tooth structures.

[0057] (Second Implementation)

[0058] like Figure 2 As shown, the second embodiment of this application proposes a vehicle power system, which includes: a planetary reducer 1, a differential 2, an electromagnet 3, a sliding sleeve 4, a sliding pusher 5, and a reset elastic member 6.

[0059] The main difference between the vehicle power system of the second embodiment and the vehicle power system of the first embodiment lies in the different positions of the sliding sleeve 4. In the second embodiment, the sliding sleeve 4 can be located between the gear ring 15 and the reducer housing 11. By moving the sliding sleeve 4 along the axial direction A between the first position and the second position, the gear ring 15 and the reducer housing 11 can be connected or disconnected against torsion, thereby connecting or disconnecting the power transmission path between the planetary reducer 1 and the differential 2.

[0060] The differential housing 21 is torsionally connected to the planet carrier 14, which is capable of driving the differential housing 21 to rotate. It should be understood that the torsional connection of the differential housing 21 to the planet carrier 14 here should be interpreted broadly, meaning that as long as the planet carrier 14 can drive the differential housing 21 to rotate. The planet carrier 14 and the differential housing 21 can be directly connected or connected via an additional mechanism or component (such as one or more gears).

[0061] The reducer housing 11 may be provided with an internal spline 17, the sliding sleeve 4 may be provided with an internal spline and an external spline, and the gear ring 15 may be provided with internal gear teeth and external gear teeth. The gear ring 15 is fitted onto the planetary gear 13, and the internal gear teeth can mesh with the minor diameter gear 132.

[0062] The switching execution unit 3 may include an electromagnet. When the electromagnet is energized, the armature extends, which can drive the sliding pusher 5 from the first position ( Figure 2 (left side of the middle) towards the second position ( Figure 2 The right side of the middle slides, thereby sliding the pusher 5 to push the sliding sleeve 4 from the first position ( Figure 2 (left side of the middle) towards the second position ( Figure 2 (Slide on the right side of the middle).

[0063] The reset elastic element 6 can be a spring. The reset elastic element 6 can be disposed between the sliding sleeve 4 and the reducer housing 11. The reset elastic element 6 is configured to enable the sliding sleeve 4 to have a tendency to move from the second position to the first position.

[0064] The outer diameter of differential 2 can be smaller than that of planetary reducer 1. Sliding sleeve 4 and differential 2 are at least partially located in the same axial space, and sliding sleeve 4 can be located radially outside of differential 2. Sliding sleeve 4 can utilize the space radially outside of differential 2, which allows the vehicle powertrain to be compactly arranged in the axial direction A, occupying less axial space.

[0065] When the sliding sleeve 4 is in the first and second positions, both the internal spline of the sliding sleeve 4 and the external spline of the gear ring 15 are engaged, and the sliding sleeve 4 and the gear ring 15 are connected against torsion. When the sliding sleeve 4 is in the first position, the external spline of the sliding sleeve 4 and the internal spline 17 of the reducer housing are not engaged, and the output and input ends of the reducer 1 are disconnected. When the sliding sleeve 4 is in the second position, the external spline of the sliding sleeve 4 and the internal spline 17 of the reducer housing are engaged, and the reducer 1 can work normally and output power.

[0066] When electromagnet 3 is energized, the armature of electromagnet 3 extends, which can drive the sliding pusher 5 along axis A to the other side of the axis ( Figure 2 The right side of the slide sleeve 4 slides along axis A to the other side of the axis ( ). Figure 2 Slide the right side of the slide sleeve 4 to keep it in the second position. At this time, the inner spline of the slide sleeve engages with the outer spline of the gear ring, and the outer spline of the slide sleeve engages with the inner spline 17 of the reducer housing. The gear ring 15 and the reducer housing 11 can be connected to the reducer housing 11 in a torsion-resistant manner through the slide sleeve 4, so that the reducer 1 can work normally and power can be transmitted from the planetary reducer 1 to the differential.

[0067] When the electromagnet 3 is de-energized, the sliding sleeve 4 and the sliding pusher 5 can be reset along the axial direction A by the elastic member 6 to one side of the axial direction. Figure 2Pushing the left side of the slide sleeve 4 keeps it in the first position. At this time, the inner spline of the slide sleeve engages with the outer spline of the gear ring, the outer spline of the slide sleeve separates from the inner spline 17 of the reducer housing, the gear ring 15 is disconnected from the reducer housing 11, the power transmission path between the input and output ends of the reducer 1 is broken, and power cannot be transmitted to the differential 2 through the reducer 1.

[0068] It is understandable that the sliding sleeve 4 can connect or disconnect the power transmission path along the entire power transmission path from the motor to the wheel. When the power transmission path is disconnected, the drag torque of the electric bridge can be reduced. The closer the sliding sleeve 4 is to the motor end, the more components the wheel drags during vehicle movement, and the greater the drag energy loss. Therefore, the first embodiment has relatively less drag energy loss compared to the second embodiment.

[0069] This application is not limited to the above embodiments. Those skilled in the art can make various modifications to the above embodiments of this application under the guidance of this application, without departing from the scope of this application. In addition, the following description is provided.

[0070] (1) In the above embodiment, the switching execution unit 3 is an electromagnet, which performs unidirectional movement only along the axial direction A, but this application is not limited to this. In other possible embodiments, the switching execution unit 3 can perform bidirectional movement along the axial direction. For example, the switching execution unit 3 can be a linear motor, so that a reset elastic element is not required. The switching execution unit 3 can drive the sliding sleeve 4 to move from the first position to the second position, or it can drive the sliding sleeve 4 to move from the second position to the first position.

[0071] (2) In the above embodiment, the switching execution unit 3 and the reset elastic element 6 are located on opposite sides of the axial direction of the planetary reducer, but this application is not limited thereto. In other possible embodiments, the electromagnet itself can be connected to the reset elastic element, that is, the reset elastic element and the main body of the electromagnet can be located on the same side of the axial direction of the planetary reducer, so that the armature extends when the electromagnet is energized and retracts under the action of the reset elastic element after the power is cut off.

[0072] (3) In the above embodiments, the differential can be a spur gear differential, but this application is not limited thereto. In other possible embodiments, the differential can also be a bevel gear differential, and the type of differential is not limited.

[0073] It should be understood that at least some aspects or features of the above-described implementation methods, embodiments, or examples can be appropriately combined.

[0074] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

[0075] In this application, unless otherwise expressly stated or limited, terms such as "installation," "assembly," "connection," "linking," "joining," "linking," "abutment," "communication," "connection," "conduction," "fixing," and "fastening" should be interpreted broadly, for example, they can be direct or indirect. For instance, regarding connection, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly stated or limited. For instance, regarding communication / conduction, it can be direct communication / conduction or indirect communication / conduction through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0076] In this application, unless otherwise expressly stated or limited, a component being disposed / installed / located / enclosed / placed within, inside, or incorporated in another component can be either of the following two situations: a portion or a majority of the one component is located within the other component; or the one component is completely enclosed within the other component.

[0077] Although the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described herein. The present application can be modified and implemented as alternative embodiments without departing from the spirit and scope of the present application as defined by the claims. Therefore, the description in this specification is for illustrative purposes only and does not have any limiting meaning for the present application.

Claims

1. A vehicle powertrain system, characterized in that, include: A planetary reducer, comprising a reducer housing, a planet carrier, and bearings, wherein the planet carrier is rotatably supported on the reducer housing relative to the reducer housing via the bearings; A differential, the differential including a differential housing; A sliding sleeve is capable of sliding along the axial direction of the vehicle power system between a first position and a second position. The sliding of the sliding sleeve can connect or disconnect the power transmission path of the planetary reducer and the differential. as well as A switching execution unit is located on one axial side of the planetary carrier. The switching execution unit is used to drive the sliding sleeve to slide along the axial direction. The switching execution unit and the bearing are at least partially in the same axial space. The switching execution unit is located radially outside the bearing.

2. The vehicle power system according to claim 1, characterized in that, The vehicle powertrain also includes a sliding pusher, which is slidably mounted on the planetary carrier relative to the planetary carrier along the axial direction. The switching actuation unit and the sliding sleeve are respectively disposed at both ends of the sliding pusher along the axial direction. The sliding pusher and the planetary carrier are at least partially located in the same axial space.

3. The vehicle power system according to claim 2, characterized in that, The switching execution unit is an electromagnet, which is configured to move the sliding pusher from the first position to the second position. The sliding pusher passes through the planet carrier along the axial direction.

4. The vehicle power system according to claim 1, characterized in that, The vehicle powertrain also includes a reset elastic element, which is configured to cause the sliding sleeve to have a tendency to move from the second position to the first position.

5. The vehicle power system according to claim 1, characterized in that, The sliding sleeve is disposed between the planetary carrier and the differential housing. By sliding the sliding sleeve between the first position and the second position along the axial direction, the differential housing and the planetary carrier can be connected or disconnected in a torsion-resistant manner.

6. The vehicle power system according to claim 1, characterized in that, The sliding sleeve is fitted onto the planetary carrier, the sliding sleeve has an internal spline, the planetary carrier has an external spline, and the differential housing has an external spline. When the sliding sleeve is in the first position, the inner spline of the sliding sleeve engages with the outer spline of the planetary carrier, the inner spline of the sliding sleeve separates from the outer spline of the differential housing, the planetary carrier and the differential housing are disconnected, and the power transmission path of the vehicle's power system is interrupted. When the sliding sleeve is in the second position, the inner spline of the sliding sleeve simultaneously engages with both the outer spline of the planetary carrier and the outer spline of the differential housing, and the sliding sleeve connects the planetary carrier and the differential housing in a torsion-resistant manner.

7. The vehicle power system according to claim 1, characterized in that, The planetary reducer further includes a sun gear, planet gears, and a ring gear. The planet gears are stepped gears, each consisting of a major diameter gear and a minor diameter gear. The major diameter gear meshes with the sun gear, and the minor diameter gear meshes with the ring gear. The sliding sleeve and the minor diameter gear are at least partially located in the same axial space, with the sliding sleeve situated radially inside the minor diameter gear.

8. The vehicle power system according to claim 1, characterized in that, The planetary reducer also includes a gear ring, and a sliding sleeve is disposed between the gear ring and the reducer housing. By sliding the sliding sleeve along the axial direction between the first position and the second position, the gear ring and the reducer housing can be connected or disconnected against torsion.

9. The vehicle power system according to claim 8, characterized in that, The planetary carrier is connected to the differential housing; the gear ring has external splines; the sliding sleeve has internal and external splines; and the reducer housing has internal splines. When the sliding sleeve is in the first position, the internal spline of the sliding sleeve meshes with the external spline of the gear ring, the external spline of the sliding sleeve separates from the internal spline of the reducer housing, the gear ring and the reducer housing are disconnected, and the power transmission path of the planetary reducer is interrupted. When the sliding sleeve is in the second position, the inner spline of the sliding sleeve meshes with the outer spline of the gear ring, the outer spline of the sliding sleeve meshes with the inner spline of the reducer housing, and the gear ring and the reducer housing are connected in a torsion-resistant manner through the sliding sleeve.

10. The vehicle power system according to claim 1, characterized in that, The outer diameter of the differential is smaller than the outer diameter of the planetary reducer, and the sliding sleeve and the differential are at least partially located in the same axial space.

Images