CN118893965A - Wheel side drive assembly and vehicle - Google Patents

Abstract

The invention relates to the technical field of vehicle parts, in particular to a wheel drive assembly and a vehicle. A wheel drive assembly includes a wheel assembly, a drive motor, a knuckle, and a transmission assembly. The wheel assembly comprises a hub, a spoke, a rim and a mandrel; the wheel hub, the wheel spoke and the wheel rim are fixedly connected in sequence; the hub is rotationally connected with the mandrel. The driving motor comprises a stator and a rotor, the rotor is positioned on the outer side of the stator, the rotor is rotationally connected with the stator, and the axis of the rotor is staggered with the axis of the mandrel. The stator is detachably connected with the knuckle, the rotor is rotationally connected with the knuckle, and the mandrel is detachably connected with the knuckle. The transmission assembly comprises a driving gear, a sun gear, a plurality of planetary gears, a planet carrier and a fixed gear ring. A vehicle includes a wheel drive assembly and a frame. Thus, the problem of lower bearing capacity caused by smaller radial size of the wheel spindle is solved.

Description

Wheel side drive assembly and vehicle

Technical Field

The present invention relates to the technical field of vehicle parts, and in particular to a wheel-side drive assembly and a vehicle.

Background Art

Electric vehicles currently use wheel-side electric drive, which can improve the space utilization of the entire vehicle by moving the drive unit to the wheel rim, while also improving driving flexibility and safety.

However, the wheel-side drive system compresses the internal space of the rim, thereby making the radial dimension of the wheel spindle smaller, and the bearing capacity of the wheel spindle needs to be further improved.

Summary of the invention

In order to solve the problem of low bearing capacity caused by small radial dimensions of a wheel spindle, the present invention provides a wheel-side drive assembly and a vehicle.

In a first aspect, the present invention provides a wheel side drive assembly, comprising:

A wheel assembly, the wheel assembly comprising a wheel hub, a wheel spoke, a wheel rim and a spindle; the wheel hub, the wheel spoke and the wheel rim are fixedly connected in sequence; the wheel hub is rotatably connected to the spindle; the wheel hub is coaxial with the spindle;

A drive motor, the drive motor comprising a stator and a rotor; the rotor is located outside the stator; the rotor is rotatably connected to the stator; the axis of the rotor is parallel to the axis of the mandrel; the axis of the rotor is misaligned with the axis of the mandrel;

Steering knuckle, the stator is detachably connected to the steering knuckle; the rotor is rotatably connected to the steering knuckle; the core shaft is detachably connected to the steering knuckle;

A transmission assembly, the transmission assembly includes a driving gear, a sun gear, a plurality of planetary gears, a planet carrier and a fixed gear ring; the driving gear is coaxial with the rotor and is detachably connected; the sun gear is sleeved on the outside of the core shaft; the sun gear is rotatably connected to the core shaft; the diameter of the driving gear is smaller than the diameter of the sun gear; the driving gear is meshed with the sun gear; a plurality of planetary gears are distributed in an annular shape; the planetary gears are rotatably connected to the planet carrier; the fixed gear ring is detachably connected to the steering knuckle; the planetary gears are meshed between the sun gear and the fixed gear ring; the planet carrier is coaxial with the wheel hub and is detachably connected.

In some embodiments, the distance between the axis of the rotor and the axis of the core shaft is 60 mm to 70 mm.

In some embodiments, a projection of the core shaft along its axial direction is located inside the drive motor.

In some embodiments, the wheel-side drive assembly also includes a protective cover; the protective cover is detachably connected to the steering knuckle; a closed accommodating cavity is formed between the protective cover and the steering knuckle; and the drive motor is located in the accommodating cavity.

In some embodiments, the wheel-side drive assembly also includes a dynamic seal assembly and a static seal assembly; the dynamic seal assembly is detachably connected between the fixed ring gear and the planet carrier; the static seal assembly is detachably connected between the planet carrier and the wheel hub.

In some embodiments, the drive motor further includes a cooling channel; the stator is detachably connected to the cooling channel; a cooling channel hole is provided on the steering knuckle; and an inner cavity of the cooling channel is connected to the cooling channel hole.

In some embodiments, the reduction ratio between the driving gear and the sun gear is 1.7-1.8; the reduction ratio between the sun gear and the planet carrier is 2.4-2.6.

In some embodiments, a groove is formed at one end of the core shaft close to the driving motor, and the rotating shaft of the rotor is located in the groove.

In some embodiments, the diameter of the core shaft is stepped; the diameter of the part of the core shaft supporting the sun gear is 43mm~47mm; the diameter of the part of the core shaft supporting the planetary carrier is 38mm~42mm; the diameter of the part of the core shaft supporting the wheel hub is 28mm~32mm.

In a second aspect, the present invention provides a vehicle, the vehicle comprising:

A wheel drive assembly as described in any of the above embodiments;

The steering knuckle of the wheel-side drive assembly is detachably connected to the vehicle frame.

In order to solve the problem of low bearing capacity caused by small radial dimension of wheel spindle, the present invention has the following advantages:

By dislocating the output shaft of the drive motor from the mandrel, a lower speed reduction mechanism can be used while increasing the diameter of the mandrel, and an outer rotor motor with large torque and low speed can be used, which can achieve stable driving of the passenger car and improve the bearing capacity of the mandrel, thereby increasing the service life of the wheel-side drive assembly. Since the drive motor and the mandrel are dislocated, the drive motor can be set higher than the mandrel when the wheel-side drive assembly is installed on the vehicle, which can minimize the possibility of water entering the drive motor when the wheel passes through a flooded road.

By increasing the size of the drive motor, the projection of the core shaft along its own axial direction is located inside the drive motor. In this way, while ensuring a low reduction ratio, the core shaft can have a larger diameter, thereby ensuring the load-bearing capacity and service life of the core shaft.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 shows a schematic structural diagram of a wheel side drive assembly according to an embodiment;

FIG2 is a schematic structural diagram of the wheel drive assembly shown in FIG1 from another perspective;

FIG3 shows a cross-sectional schematic diagram of the wheel side drive assembly shown in FIG1 ;

FIG4 shows a schematic structural diagram of a steering knuckle and a protective cover according to an embodiment;

FIG5 shows a schematic structural diagram of a steering knuckle according to an embodiment;

FIG6 shows a schematic cross-sectional view of the steering knuckle shown in FIG5 ;

FIG7 shows a schematic structural diagram of a mandrel according to an embodiment;

FIG. 8 shows a schematic structural diagram of a vehicle according to an embodiment.

Figure numerals: wheel assembly 10; wheel hub 11; first shaft section 111; second shaft section 112; spoke 12; rim 13; spindle 14; groove 141; tire 15; drive motor 20; stator 21; rotor 22; cooling channel 23; steering knuckle 30; first mounting groove 31; second mounting groove 32; third mounting groove 33; cooling channel hole 34; transmission assembly 40; driving gear 41; sun gear 42; planetary gear 43; planetary carrier 44; fixed ring gear 45; protective cover 50; dynamic seal assembly 60; static seal assembly 70; brake disc 80; frame 90.

DETAILED DESCRIPTION

The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

Electric vehicles currently use wheel-side electric drive to improve vehicle space utilization by moving the drive unit to the wheel rim, while also improving driving flexibility and safety. However, the wheel-side drive system compresses the internal space of the wheel rim, making the radial dimension of the wheel spindle smaller, and the bearing capacity of the wheel spindle needs to be further improved.

In order to solve the above problems, the present embodiment discloses a wheel-side drive assembly, as shown in FIG1, FIG2 and FIG3, the wheel-side drive assembly may include a wheel assembly 10, a drive motor 20, a steering knuckle 30 and a transmission assembly 40. The wheel assembly 10 may include a hub 11, spokes 12, a rim 13 and a spindle 14. The hub 11, the spokes 12 and the rim 13 are fixedly connected in sequence, and the hub 11 is located inside the rim 13. The hub 11 is rotatably connected to the spindle 14, and the hub 11 and the spindle 14 are coaxially arranged, and the spindle 14 provides support for the rotation of the hub 11. It should be understood that the wheel assembly 10 may also include a tire 15, and the tire 15 is clamped on the outer circumferential wall of the rim 13.

3 , the drive motor 20 may include a stator 21 and a rotor 22. The rotor 22 is located outside the stator 21, that is, the drive motor 20 is an outer rotor motor. The rotor 22 is rotatably connected to the stator 21, the axis of the rotor 22 is parallel to the axis of the mandrel 14, and the axis of the rotor 22 is misaligned with the axis of the mandrel 14. The stator 21 is detachably connected to the knuckle 30, and the rotor 22 is rotatably connected to the knuckle 30. Thus, the drive motor 20 is integrated on the knuckle 30, which improves the utilization rate of the internal space of the rim 13. The mandrel 14 is detachably connected to the knuckle 30.

The transmission assembly 40 may include a driving gear 41, a sun gear 42, a plurality of planetary gears 43, a planet carrier 44 and a fixed ring gear 45. The driving gear 41 is coaxial with the rotor 22 and is detachably connected. When the rotor 22 rotates, it can drive the driving gear 41 to rotate. The sun gear 42 is sleeved on the outer side of the core shaft 14. The sun gear 42 is rotatably connected to the core shaft 14, and the core shaft 14 supports the rotation of the sun gear 42. The diameter of the driving gear 41 is smaller than the diameter of the sun gear 42. The driving gear 41 meshes with the sun gear 42, so that the transmission of the driving gear 41 and the sun gear 42 realizes the first stage of deceleration.

A plurality of planetary gears 43 are distributed in an annular shape. The planetary gears 43 are rotatably connected to the planet carrier 44. The axis of the planetary gears 43 is parallel to the axis of the sun gear 42. The fixed gear ring 45 is detachably connected to the steering knuckle 30. The planetary gears 43 are meshed between the sun gear 42 and the fixed gear ring 45. The planet carrier 44 is coaxially detachably connected to the wheel hub 11. When the sun gear 42 rotates, the planetary gears 43 are driven to rotate around the sun gear 42, and then the planetary gears 43 drive the planetary carrier 44 to rotate, and the planetary carrier 44 drives the wheel hub 11 to rotate. The planetary reduction mechanism formed by the sun gear 42, the planetary gears 43, and the planetary carrier 44 realizes the second stage of reduction.

Therefore, the present invention adopts an outer rotor motor with a larger shaft diameter, so that the diameter of the driving gear 41 is larger. The outer rotor motor has a larger torque and a lower rotation speed. The present invention displaces the axis of the rotor 22 of the drive motor 20 and the core shaft 14, and adopts a two-stage reduction mechanism with a lower reduction ratio, so that the diameter of the core shaft 14 can be designed to be larger, thereby improving the bearing capacity and service life of the core shaft 14, and at the same time ensuring the driving speed of the vehicle.

In some embodiments, as shown in Figures 3 and 4, the wheel drive assembly may further include a brake disc 80. The wheel hub 11 may include a first shaft segment 111 and a second shaft segment 112, the brake disc 80 is detachably connected between the first shaft segment 111 and the second shaft segment 112, the first shaft segment 111 is detachably connected to the planet carrier 44, and the second shaft segment 112 is fixedly connected to the spoke 12.

In some embodiments, as shown in FIG3 , the distance between the axis of the rotor 22 and the axis of the mandrel 14 is 60 mm to 70 mm, preferably 66 mm, 66.5 mm, or 67 mm. This can be adapted to the size design of the mandrel 14 and the size design of the drive motor 20 of most passenger cars. This ensures that the drive motor 20 has a larger torque, a lower speed, and is connected to a lower reduction ratio, while improving the radial size and load-bearing capacity of the mandrel 14.

In some embodiments, as shown in FIG. 3 , FIG. 5 , and FIG. 6 , a first mounting groove 31 , a second mounting groove 32 , and a third mounting groove 33 are provided on the steering knuckle 30 . The first mounting groove 31 and the third mounting groove 33 are located on the opposite sides of the bogie, and the second mounting groove 32 is used to connect the first mounting groove 31 and the third mounting groove 33 . The driving gear 41 is arranged in the second mounting groove 32 . One end of the spindle 14 and one end of the sun gear 42 are both located in the third mounting groove 33 . Therefore, the wheel side drive assembly in this embodiment has a high degree of integration, and thus has a high working reliability.

In some embodiments, as shown in FIG3 , the projection of the mandrel 14 along its own axial direction can be located inside the drive motor 20. In this way, on the basis of ensuring a larger diameter of the mandrel 14, the size of the rotor 22 of the drive motor 20 and the shaft diameter of the rotor 22 are further increased, thereby ensuring a lower reduction ratio.

In some embodiments, as shown in FIG. 3 and FIG. 6 , the wheel-side drive assembly may further include a protective cover 50, which is detachably connected to the steering knuckle 30. A closed receiving cavity is formed between the protective cover 50 and the steering knuckle 30; the drive motor 20 is located in the receiving cavity. The first mounting groove 31 is a part of the receiving cavity. Specifically, the rotor 22 and the stator 21 are located in the receiving cavity, thereby improving the integration of the wheel-side drive assembly, thereby ensuring a higher service life and improving the utilization rate of the internal space of the rim 13.

In some embodiments, the wheel side drive assembly may further include a dynamic seal assembly 60 and a static seal assembly 70, wherein the dynamic seal assembly 60 is detachably connected between the fixed gear ring 45 and the planet carrier 44, and the static seal assembly 70 is detachably connected between the planet carrier 44 and the wheel hub 11. The wheel side drive assembly of the present invention has a high degree of integration, the number of dynamic seal assemblies 60 is reduced to one, and the number of static seal assemblies 70 is also reduced to one, thereby ensuring the airtightness and safety of the working environment of the rotor 22 and the stator 21. In addition, the driving gear 41, the fixed gear ring 45, the planetary gear 43 and the corresponding multiple bearings are separated between the drive motor 20 and the dynamic seal assembly 60, so that even if the dynamic seal assembly is aged after a long period of work, the water that penetrates from the position of the dynamic seal assembly 60 is not easy to reach the position of the drive motor 20, and the bearing will make an abnormal sound when immersed in water, so that the aging problem of the dynamic seal assembly 60 can be found before the drive motor 20 is immersed in water, thereby ensuring the service life of the drive motor 20.

In some embodiments, as shown in FIG3 , the drive motor 20 further includes a cooling channel 23, and the stator 21 is detachably connected to the cooling channel 23. A cooling channel hole 34 is provided on the steering knuckle 30, and the inner cavity of the cooling channel 23 is connected to the cooling channel hole 34. The design of the cooling channel 23 and the cooling channel hole 34 improves the integration effect of the drive motor 20 and the steering knuckle 30. The present invention can improve the cooling effect of the drive motor 20 and thus improve the service life by passing the coolant into the cooling channel 23 through the cooling channel hole 34 on the steering knuckle 30.

In some embodiments, the reduction ratio between the driving gear 41 and the sun gear 42 is 1.7-1.8, and the reduction ratio between the sun gear 42 and the planet carrier 44 is 2.4-2.6. In this way, the overall reduction ratio of the wheel drive assembly of this embodiment can reach 4.1-4.4, achieving a lower reduction ratio.

In some embodiments, a groove 141 may be provided at one end of the core shaft 14 close to the drive motor 20, and the rotating shaft of the rotor 22 may be located in the groove 141. Thus, the size of the drive motor 20 and the size of the core shaft 14 can be further increased to ensure a higher load-bearing capacity of the core shaft 14 and a lower reduction ratio of the wheel-side drive assembly. The rated speed of the drive motor is 3000r/min, and the maximum speed is 6000r/min. After deceleration, the rated speed of the wheel end is 700r/min, and when matched with a tire 15 with a rolling radius of 350mm, the corresponding vehicle speed is 92km/h. After deceleration, the maximum speed of the wheel end can be 1400r/min, and when matched with a tire 15 with a rolling radius of 350mm, the corresponding vehicle speed is 182km/h. Thus, the driving requirements of passenger cars are met.

In some embodiments, as shown in FIG. 3 and FIG. 7 , the diameter of the mandrel 14 is stepped, and the diameter of the part of the mandrel 14 supporting the sun gear 42 is 43 mm to 47 mm, preferably 45 mm. The diameter of the part of the mandrel 14 supporting the planetary carrier 44 is 38 mm to 42 mm, preferably 40 mm. The diameter of the part of the mandrel 14 supporting the wheel hub 11 is 28 mm to 32 mm, preferably 30 mm. In this way, the diameter size of the mandrel 14 is greatly improved, and the bearing capacity and service life of the mandrel 14 are guaranteed.

This embodiment also discloses a vehicle, as shown in FIG3 and FIG8 , the vehicle includes the wheel drive assembly and the frame in any of the above embodiments. The steering knuckle 30 in the wheel drive assembly is detachably connected to the frame. The axes of the rotor 22 and the stator 21 are both located above the axis of the core shaft 14. In this way, the height of the drive motor 20 from the ground can be raised, further reducing the risk of the drive motor 20 being immersed in water.

Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims (10)

1. A wheel drive assembly, the wheel drive assembly comprising:

A wheel assembly comprising a hub, a spoke, a rim and a spindle; the hub, the spoke and the rim are fixedly connected in sequence; the hub is rotationally connected with the mandrel; the hub is coaxial with the mandrel;

a driving motor including a stator and a rotor; the rotor is positioned outside the stator; the rotor is rotationally connected with the stator; the axis of the rotor is parallel to the axis of the mandrel; the axis of the rotor is misplaced with the axis of the mandrel;

the stator is detachably connected with the steering knuckle; the rotor is rotationally connected with the steering knuckle; the mandrel is detachably connected with the steering knuckle;

The transmission assembly comprises a driving gear, a sun gear, a plurality of planetary gears, a planet carrier and a fixed gear ring; the driving gear is coaxial with the rotor and is detachably connected with the rotor; the sun gear is sleeved on the outer side of the mandrel; the sun gear is rotationally connected with the mandrel; the diameter of the driving gear is smaller than that of the sun gear; the drive gear is meshed with the sun gear; the planetary gears are distributed in a ring shape; the planetary gear is rotationally connected with the planetary carrier; the fixed gear ring is detachably connected with the steering knuckle; the planetary gear is meshed between the sun gear and the fixed gear ring; the planet carrier is coaxial with the hub and detachably connected with the hub.

2. A wheel drive assembly according to claim 1, wherein,

The axial distance between the axis of the rotor and the axis of the mandrel is 60-70 mm.

3. A wheel drive assembly according to claim 1, wherein,

The projection of the mandrel along the axial direction of the mandrel is positioned in the driving motor.

4. A wheel drive assembly according to claim 3, wherein,

The wheel drive assembly further comprises a protective cover; the protective cover is detachably connected with the steering knuckle; a closed accommodating cavity is formed between the protective cover and the steering knuckle; the drive motor is located within the receiving cavity.

5. A wheel drive assembly according to claim 4, wherein,

The wheel edge driving assembly further comprises a dynamic sealing assembly and a static sealing assembly; the dynamic seal assembly is detachably connected between the fixed gear ring and the planet carrier; the static seal assembly is detachably connected between the planet carrier and the hub.

6. A wheel drive assembly according to claim 4, wherein,

The driving motor also comprises a cooling runner; the stator is detachably connected with the cooling flow passage; the steering knuckle is provided with a cooling passage hole; the inner cavity of the cooling flow channel is communicated with the cooling channel hole.

7. A wheel drive assembly according to claim 3, wherein,

The reduction ratio of the driving gear to the sun gear is 1.7-1.8; the reduction ratio between the sun gear and the planet carrier is 2.4-2.6.

8. A wheel drive assembly according to claim 3, wherein,

The spindle is close to one end of the driving motor and is provided with a groove, and the rotating shaft of the rotor is positioned in the groove.

9. A wheel drive assembly according to claim 3, wherein,

The diameter of the mandrel is stepped; the diameter of the part of the mandrel supporting the sun gear is 43-47 mm; the diameter of the part of the mandrel supporting the planet carrier is 38-42 mm; the diameter of the part of the mandrel supporting the hub is 28-32 mm.

10. A vehicle, characterized in that the vehicle comprises:

the wheel drive assembly of any of claims 1-9;

And the steering knuckle of the wheel rim driving assembly is detachably connected with the frame.