Driving mechanism assembly

Abstract

The utility model discloses a driving mechanism assembly which comprises a support and a driving part, the driving part comprises a motor, a planetary reducer and a gear reducer, the planetary reducer comprises a sun gear, a plurality of planet gears, a planet carrier, a gear ring and a first bearing, and the sun gear is driven by a rotating shaft of the motor to rotate; the plurality of planet gears are uniformly meshed with the outer ring of the sun gear; the planet carrier is in synchronous transmission connection with the planet wheel; an inner ring of the gear ring is meshed with outer side gears of the multiple planet gears, an outer ring of the gear ring is fixed to the support, a center shaft of the gear ring, a center shaft of the planet carrier and a center shaft of the sun gear coincide, and the gear ring extends in the direction away from the planet gears to form a first bearing cavity. The first bearing is located in the first bearing cavity, the outer ring of the first bearing is connected with the inner ring of the gear ring in a matched mode, and the inner ring of the first bearing is connected with the outer circumferential face of the planet carrier in a matched mode. According to the utility model, the concentricity between the planet carrier and the motor output shaft can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of drive mechanism assemblies, in particular to a drive mechanism assembly. Background Art

[0002] In the prior art, the requirements are usually met by combining a motor, a planetary reducer, and a gear reducer. Typically, the planetary reducer is located between the motor and the gear reducer. To ensure stable and safe operation of the drive mechanism, the planetary reducer must maintain high precision when working with the motor and gear reducer. Concentricity is one of the key parameters affecting precision. After the motor drives the planetary gears to rotate, the planetary gears can drive the output gears on the planetary carrier to rotate, and then transmit the driving force to the gear reducer through the output gears. Therefore, the concentricity between the planetary carrier and the motor output shaft must be particularly ensured.

[0003] In the prior art, bearings are generally provided in the reducer housing to support the planetary carrier. This structure has the following defects:

[0004] Since the planetary carrier is fixedly connected to the planetary gear, and the planetary gear is meshed with the inner gear of the ring gear, the installation base of the planetary carrier depends on the position of the ring gear, and the planetary carrier relies on the bearing support in the reducer housing, which means that the installation base of the planetary carrier also depends on the reducer housing. There are many matching bases, and the concentricity between the planetary carrier and the motor output shaft cannot be guaranteed during installation. Utility Model Content

[0005] In view of the deficiencies of the prior art, the present invention provides a drive mechanism assembly, which can ensure the concentricity between the planet carrier and the motor output shaft.

[0006] The utility model is achieved through the following technical solutions:

[0007] A driving mechanism assembly comprises a bracket for supporting a vehicle body and a driving member, wherein the driving member is integrated on the bracket;

[0008] The driving member includes a motor, a planetary reducer and a gear reducer. The planetary reducer is used to transmit the output power of the motor to the gear reducer. The planetary reducer includes:

[0009] a sun gear, the sun gear being driven to rotate by the rotating shaft of the motor;

[0010] a plurality of planetary gears, wherein the plurality of planetary gears are uniformly meshed with the outer ring of the sun gear;

[0011] A planet carrier, the planet carrier being synchronously connected to the planetary gears;

[0012] a ring gear, wherein an inner ring of the ring gear is meshed with outer gears of the plurality of planetary gears, an outer ring of the ring gear is fixed to the bracket, a central axis of the ring gear, a central axis of the planetary carrier, and a central axis of the sun gear coincide with each other, and the ring gear extends away from the planetary gears to form a first bearing cavity;

[0013] The first bearing is located in the first bearing cavity, and the outer ring of the first bearing is matched with the inner ring of the gear ring, and the inner ring of the first bearing is matched with the outer peripheral surface of the planet carrier.

[0014] Furthermore, the connection relationship between the outer ring of the first bearing and the inner ring of the gear ring is a loose fit, and the connection relationship between the inner ring of the first bearing and the outer peripheral surface of the planet carrier is a tight fit.

[0015] Furthermore, a limiting protrusion is convexly provided on the outer peripheral surface of the planetary carrier, one side of the first bearing abuts against the limiting protrusion, and the other side abuts against the teeth in the inner ring of the gear ring.

[0016] Furthermore, the gear ring is made of steel.

[0017] Furthermore, the drive mechanism assembly also includes a reducer housing, which is detachably connected to the bracket, and the reducer housing cover is arranged on the outside of the planetary reducer and the gear reducer.

[0018] Furthermore, a second bearing is installed on the output shaft of the planetary carrier, and a second bearing chamber for installing the second bearing is provided in the reducer housing, and the connection relationship between the outer ring of the second bearing and the inner wall of the reducer housing is loose, and the connection relationship between the inner ring of the second bearing and the outer peripheral surface of the output shaft is tight.

[0019] Furthermore, the outer ring of the second bearing is provided with a sealing ring, and the sealing ring abuts against the reducer housing.

[0020] Furthermore, a first shoulder is formed on the output shaft, and one side of the second bearing abuts against the first shoulder and the other side abuts against the inner wall of the reducer housing.

[0021] Furthermore, the outer ring of the gear ring is provided with a plurality of evenly spaced splines, and the splines are interference fit with the bracket and the inner side of the reducer housing at the same time.

[0022] Furthermore, the gear reducer is arranged obliquely.

[0023] Furthermore, the drive mechanism assembly also includes a plurality of pins, which are arranged in a one-to-one correspondence with the plurality of planetary gears, one end of the pin is matched with the planetary gear, and the other end is interference fit with the planetary carrier, and a needle bearing is arranged between the pin and the planetary gear.

[0024] Furthermore, it also includes a wheel assembly that is transmission-connected to the driving member, and the wheel assembly includes a wheel axle, a tire, a support member and at least one roller bearing. The support member is made of steel and is fixed in the bracket. The outer ring of the roller bearing abuts against the inner side of the support member, and the inner ring of the roller bearing is matched with the outer periphery of the wheel axle. One end of the wheel axle is transmission-connected to the gear reducer, and the other end is fixedly connected to the tire.

[0025] Furthermore, the bracket is formed with a single-sided support arm, and the tire is located on the inner side of the single-sided support arm and is arranged away from the gear reducer.

[0026] Furthermore, the support member is used to bear the stress transmitted by the unilateral support arm, and the axial length of the support member extends to the tire, and can also bear the stress applied by the tire (61).

[0027] Furthermore, the gear reducer includes a primary driving gear, a primary driven gear meshed with the primary driving gear, a secondary driving gear coaxially connected to the primary driven gear, and a secondary driven gear meshed with the secondary driving gear, the primary driving gear is sleeved on the output shaft on the planetary carrier, and the secondary driven gear is matched with the wheel axle.

[0028] Furthermore, the at least one roller bearing includes a first tapered roller bearing and a second tapered roller bearing, and a spacer is protruding from the inner wall of the support member. One side of the first tapered roller bearing abuts against one side of the spacer, and the other side abuts against the secondary driven gear. One side of the second tapered roller bearing abuts against the other side of the spacer, and the other side abuts against the second shoulder on the wheel axle.

[0029] Furthermore, the motor includes a casing, the casing is fixedly connected to the bracket, and a stator and a rotor with a clearance fit with the stator are arranged in the casing, and the rotor is interference fit with the rotating shaft.

[0030] Furthermore, the motor is located inside the bracket, which can fully utilize the inner installation space; the planetary reducer and gear reducer are located outside the bracket, and the planetary reducer and gear reducer are radially distributed, which can reduce the space occupied by the drive mechanism assembly.

[0031] Compared with the prior art, the advantages of the present invention are:

[0032] 1. A first bearing chamber for accommodating the first bearing is formed by extending the ring gear away from the planet gear. The sun gear on the rotating shaft meshes with the planet gear, and the planet carrier is synchronously connected to the planet gear, which is meshed with the ring gear. Therefore, one installation reference of the planet carrier depends on the ring gear. By installing the first bearing in the first bearing chamber formed inside the ring gear, it is ensured that the other installation reference of the planet carrier also depends on the ring gear, ensuring that both installation references of the planet carrier are the ring gear. Therefore, the installation error of the planet carrier is small and the installation accuracy is high, making the combination between the planet carrier and the rotating shaft more stable, thereby ensuring that the concentricity between the planet carrier and the rotating shaft is high, and thus ensuring the rotation accuracy of the planet carrier.

[0033] 2. The gear ring is made of steel. Compared with the traditional process, since the gear ring of the utility model is made of alloy steel, its temperature expansion coefficient is smaller than that of aluminum, and it is less affected by temperature. When the gear ring is heated, a relatively small gap is generated between the first bearing chamber of the gear ring and the first bearing, which can ensure that the combination between the rotating shaft and the planetary carrier is more stable during the operation of the drive mechanism assembly, thereby ensuring a high concentricity between the planetary carrier and the rotating shaft, and thus ensuring the rotation accuracy of the planetary carrier.

[0034] 3. A support member is provided, fixed within the bracket. The outer ring of the roller bearing abuts the inner side of the support member, and the inner ring of the roller bearing mates with the outer circumference of the wheel axle. One end of the wheel axle is fixedly connected to the gear reducer, and the other end is fixedly connected to the tire. The tire exerts high pressure on the ground, and because the bracket is supported unilaterally by the tire, the roller bearing is subjected to significant force. Without the support member, the force on the roller bearing would be applied to the aluminum bracket, causing the outer ring of the roller bearing to deform due to the bracket after extended driving, resulting in increasing deformation of the coupling between the two and a larger gap. In this embodiment, by adding the support member, the force on the roller bearing is applied to the support member. Because the support member is made of steel, which has high hardness and increased strength, this phenomenon can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the structure of the drive mechanism assembly;

[0036] Figure 2 is a cross-sectional view of the drive mechanism assembly;

[0037] Figure 3 It is the front view of the drive mechanism assembly;

[0038] Figure 4 for Figure 3 Cross-sectional view along AA;

[0039] Figure 5It is the structural diagram of the planetary reducer;

[0040] Figure 6 This is a partial exploded view of the planetary reducer;

[0041] Figure 7 It is a partial structural diagram of the planetary reducer;

[0042] Figure 8 Schematic diagram of the structure of the ring gear;

[0043] Figure 9 It is a partial structural diagram of the drive mechanism assembly;

[0044] Figure 10 for Figure 3 Cross-sectional view along BB.

[0045] 1. Bracket; 10. Single-sided support arm; 2. Motor; 20. Rotating shaft; 21. Casing; 22. Stator; 23. Rotor; 24. Third bearing; 25. Fourth bearing; 3. Planetary reducer; 30. Sun gear; 31. Planetary gear; 32. Planet carrier; 320. Output shaft; 322. First shaft shoulder; 321. Stopping protrusion; 33. Ring gear; 330. First bearing chamber; 331. Tooth; 332. Spline; 34. First bearing; 35. Second bearing; 36. Pin; 37. Needle roller bearing; 4. Gear reducer; 40. Primary driving gear; 41. Primary driven gear; 42. Secondary driving gear; 43. Secondary driven gear; 44. Connecting shaft; 45. Fifth bearing; 46. Sixth bearing; 5. Reducer housing; 50. Second bearing chamber; 6. Wheel assembly; 60. Wheel axle; 600. Second shoulder; 61. Tire; 62. Support member; 620. Spacer; 63. Roller bearing; 630. First tapered roller bearing; 631. Second tapered roller bearing. DETAILED DESCRIPTION

[0046] The following is a further non-restrictive detailed description of the technical solution of the utility model in conjunction with the preferred embodiments and the accompanying drawings. In the description of the utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limiting the utility model.

[0047] like Figure 1 and Figure 2 As shown, a driving mechanism assembly according to an embodiment of the present invention includes a bracket 1 for supporting a vehicle body, a wheel assembly 6 and a driving member. The driving member is integrated on the bracket 1 and is used to drive the wheel assembly 6 to rotate.

[0048] The drive unit includes a motor 2, a planetary reducer 3, and a gear reducer 4. The planetary reducer 3 transmits the output power of the motor 2 to the gear reducer 4. The gear reducer 4 is located on one side of the bracket 1. In this embodiment, the gear reducer is arranged in a vertical plane and the gear reducer 4 is positioned at an angle. This not only lowers the center of gravity of the drive unit and improves support stability, but also fully utilizes the installation space and avoids space waste.

[0049] The drive mechanism assembly also includes a reducer housing 5, which is detachably connected to the bracket 1 and covers the planetary reducer 3 and the gear reducer 4. The reducer housing 5 and the gear reducer 4 are aligned in the same direction. The reducer housing 5 is generally made of aluminum for its excellent heat dissipation and weight reduction.

[0050] like Figure 3 and Figure 4As shown, the motor 2 includes a rotating shaft 20, a housing 21, a stator 22, a rotor 23, a third bearing 24 and a fourth bearing 25. The housing 21 is fixedly connected to the bracket 1 by screws. The stator 22 and the rotor 23 are both arranged in the housing 21, and the stator 22 and the rotor 23 are clearance-fitted. The rotor 23 is coaxially arranged with the rotating shaft 20 and the rotor 23 and the rotating shaft 20 are interference-fitted. The third bearing 24 and the fourth bearing 25 are respectively located on both sides of the rotor 23, and the inner rings of the third bearing 24 and the fourth bearing 25 are both fitted with the rotating shaft 20, and the outer rings of the third bearing 24 and the fourth bearing 25 are both fitted with the housing 21, thereby improving the structural stability of the rotating shaft 20 and the rotor 23.

[0051] There is a certain distance between the two corresponding wheel assemblies 6 of the drive mechanism assembly. In this application, the length direction of the motor 2 is consistent with the direction of the two wheel assemblies 6. Therefore, the motor 2 is set on the inner side of the bracket 1, which can fully utilize the installation space inside the bracket 1.

[0052] like Figure 5-Figure 7 As shown, the planetary reducer 3 includes a sun gear 30, multiple planetary gears 31, a planet carrier 32, a ring gear 33, and a first bearing 34. The sun gear 30 is driven to rotate by the rotating shaft 20 of the motor 2. The sun gear 30 can be an independent pinion and is fixedly mounted on the rotating shaft 20 to achieve synchronous rotation with the rotating shaft 20. The sun gear 30 can also be directly machined from the end position of the rotating shaft 20 to better ensure the concentricity between the planetary reducer 3 and the motor 2. Multiple planetary gears 31 are evenly meshed with the outer ring of the sun gear 30. Specifically, in this embodiment, there are three planetary gears 31, and the three planetary gears 31 are evenly spaced and arranged circumferentially around the outer ring of the sun gear 30. The inner ring of the ring gear 33 meshes with the outer gears of the multiple planetary gears 31, and the outer ring of the ring gear 33 is fixed to the bracket 1. The central axis of the ring gear 33, the central axis of the planetary carrier 32, and the central axis of the sun gear 30 coincide, and the planetary carrier 32 and the planetary gears 31 are synchronously connected. Specifically, the drive mechanism assembly also includes multiple pins 36, which are arranged one-to-one with the multiple planetary gears 31. One end of the pin 36 is connected to the planetary gear 31, and the other end is interference fit with the planetary carrier 32. To reduce friction between the pins 36 and the planetary gears 31, reduce energy loss, and prevent excessive temperature of the lubricating oil, needle roller bearings 37 are also provided between the pins 36 and the planetary gears 31. During operation, the sun gear 30 rotates under the drive of the rotating shaft 20. The sun gear 30 then drives the multiple planetary gears 31 to rotate uniformly along the inner ring of the ring gear 33. The multiple planetary gears 31 work together to drive the planetary carrier 32 to rotate.

[0053] like Figure 8As shown, in this embodiment, the first bearing 34 and the ring gear 33 are both made of steel, specifically alloy steel. The ring gear 33 extends away from the direction of the planetary gear 31 to form a first bearing chamber 330. The first bearing 34 is located in the first bearing chamber 330, and the outer ring of the first bearing 34 is matched with the inner ring of the ring gear 33, and the inner ring of the first bearing 34 is matched with the outer circumferential surface of the planetary carrier 32. In conventional processes, the first bearing 34 is typically fixed between the inner wall of the reducer housing 5 and the outer circumference of the planet carrier 32. However, due to the heat generated during operation of the drive mechanism assembly and the large thermal expansion coefficient of the reducer housing 5, which is made of aluminum, the reducer housing 5 easily expands when heated. This ultimately results in a relatively large gap between the bearing cavity formed by the aluminum and the first bearing 34. This gap is larger than the gap between the bearing cavity formed by the ring gear 33 and the first bearing 34. Therefore, in the present invention, the first bearing 34 is mounted in a first bearing cavity 330 formed within the ring gear 33. Because the ring gear 33 is made of alloy steel, its thermal expansion coefficient is smaller than that of aluminum and is less affected by temperature. When the ring gear 33 is heated, the relatively small gap between the first bearing cavity 330 of the ring gear 33 and the first bearing 34 ensures a more stable fit between the rotating shaft 20 and the planet carrier 32 during operation of the drive mechanism assembly, thereby ensuring high concentricity between the planet carrier 32 and the rotating shaft 20, and thus ensuring the rotation accuracy of the planet carrier 32. On the other hand, the sun gear 30 on the rotating shaft 20 is meshed with the planet gears 31, and the planet carrier 32 is synchronously connected to the planet gears 31, and the planet gears 31 are meshed with the ring gear 33. Therefore, the installation reference of the planet carrier 32 depends on the ring gear 33. In the traditional process, the planet carrier 32 is also connected to the reducer housing 5 through the first bearing 34. Therefore, the reducer housing 5 is equivalent to another installation reference of the planet carrier 32. Fixing the planet carrier 32 by two references will inevitably increase the installation error and the installation accuracy is low. However, the utility model ensures that the two installation references of the planet carrier 32 are both the ring gear 33 by installing the first bearing 34 in the first bearing cavity 330 formed inside the ring gear 33. Therefore, the installation error of the planet carrier 32 is small and the installation accuracy is high, making the combination between the planet carrier 32 and the rotating shaft 20 more stable, thereby ensuring the high concentricity between the planet carrier 32 and the rotating shaft 20, and thus ensuring the rotation accuracy of the planet carrier 32.

[0054] In this embodiment, the outer ring of the first bearing 34 is loosely connected to the inner ring of the ring gear 33. During installation, the first bearing 34 is installed from left to right within the first bearing chamber 330 formed by the ring gear 33. This loose fit ensures that the outer ring of the first bearing 34 is not subjected to the installation pressure from the inner side of the ring gear 33, avoiding hard contact and ensuring the structural stability of the first bearing 34 and the first bearing chamber 330 formed by the ring gear 33. This ensures the concentricity of the planet carrier 32 and the ring gear 33 after installation, and further ensures the concentricity of the planet carrier 32 and the rotating shaft 20, ultimately ensuring stable operation and low noise. The inner ring of the first bearing 34 is tightly connected to the outer circumference of the planet carrier 32, ensuring the stability of the connection between the planet carrier 32 and the first bearing 34.

[0055] like Figure 6-Figure 8 As shown, a limiting protrusion 321 is provided on the outer circumference of the planet carrier 32. One side of the first bearing 34 abuts the limiting protrusion 321, and the other side abuts the teeth 331 in the inner ring of the ring gear 33. During installation, the first bearing 34 is pressed against the planet carrier 32 from the right side with interference fit until the left side of the inner ring of the first bearing 34 abuts the limiting protrusion 321, ensuring that it is properly installed. The first bearing 34 is then installed into the first bearing chamber 330 of the ring gear 33. During the installation of the first bearing 34 into the first bearing chamber 330 of the ring gear 33, the end faces of the teeth 331 in the inner ring of the ring gear 33 can limit the outer ring of the bearing 1, ensuring that it is properly installed and preventing the first bearing 34 from moving in the axial direction of the rotating shaft 20 during operation.

[0056] like Figure 4 As shown, a second bearing 35 is mounted on the output shaft 320 of the planetary carrier 32. A second bearing chamber 50 for mounting the second bearing 35 is provided within the reducer housing 5. The outer ring of the second bearing 35 is loosely connected to the inner wall of the reducer housing 5, ensuring that the outer ring of the second bearing 35 is not subjected to the mounting pressure from the inside of the reducer housing 5, avoiding hard contact and ensuring the structural stability of the second bearing 35 and the second bearing chamber 50 formed by the reducer housing 5. This ensures the concentricity of the planetary carrier 32 and the rotating shaft 20 after installation, ultimately ensuring stable operation and low noise generation. The inner ring of the second bearing 35 is tightly connected to the outer circumference of the output shaft 320, ensuring the stability of the connection between the planetary carrier 32 and the second bearing 35.

[0057] The outer ring of the second bearing 35 is provided with a sealing ring, which is an O-ring. In order to prevent the sealing ring from sliding and dislocating, the outer ring of the second bearing 35 is provided with an annular groove to position and accommodate the sealing ring. The sealing ring is in contact with the reducer housing 5. The sealing ring is used to compensate for the gap caused by the different expansion coefficients of the reducer housing 5 made of aluminum and the second bearing 35 made of alloy steel after heating.

[0058] like Figure 4 and Figure 7 As shown, a first shoulder 322 is formed on the output shaft 320 , and one side of the second bearing 35 abuts against the first shoulder 322 and the other side abuts against the inner wall of the reducer housing 5 to prevent the second bearing 35 from moving in the axial direction of the rotating shaft 20 .

[0059] like Figure 8 As shown, the outer ring of the ring gear 33 is provided with multiple evenly spaced splines 332. The splines 332 simultaneously form an interference fit with the inner side of the bracket 1 and the reducer housing 5, utilizing the metal fluidity of the bracket 1 and the reducer housing 5 to achieve relative fixation. The large number of splines 332 provides a better fit than a clearance fit structure with protrusions and grooves. During the meshing process between the planetary gears 31 and the ring gear 33, a circumferential force is applied to the ring gear 33. The multiple splines 332, combined with the interference fit, ensure a more uniform force on the ring gear 33, preventing the ring gear 33 from failing and causing circumferential rotation after long-term operation.

[0060] like Figure 9 and Figure 10 As shown, the wheel assembly 6 includes a wheel axle 60, a tire 61, a support member 62, and at least one roller bearing 63. The support member 62 is made of steel and fixed within the bracket 1. The outer ring of the roller bearing 63 abuts the inner side of the support member 62, while the inner ring of the roller bearing 63 mates with the outer circumference of the wheel axle 60. One end of the wheel axle 60 is fixedly connected to the gear reducer 4, and the other end is in driving connection with the tire 61. The tire 61 exerts high pressure on the ground, and because the bracket 1 is supported unilaterally by the tire 61, the roller bearing 63 is subjected to high forces. Without the support member 62, the forces exerted on the roller bearing 63 would be applied to the aluminum bracket 1, causing the outer ring of the roller bearing 63 to deform significantly after prolonged driving, thereby increasing the gap. In this embodiment, by adding the support member 62, the forces exerted on the roller bearing 63 are applied to the support member 62. Because the support member 62 is made of steel, its high hardness and strength improves, thus avoiding this problem.

[0061] Bracket 1 is formed with a single-sided support arm 10, with tire 61 positioned on the inner side of single-sided support arm 10 and facing away from gear reducer 4. Single-sided support arm 10 provides single-sided support, reducing weight, achieving lightweight design, and lowering costs. Tire 61 is directly mounted in an exposed manner, eliminating the need for fasteners such as long bolts to be inserted and positioned, compared to mounting between two support arms. This exposed mounting allows for direct docking with the mounting surface of tire 61 during the single-sided support installation process, making it more convenient.

[0062] Support member 62 is used to absorb the stress transmitted by the single-sided support arm 10. Its axial length extends to the tire 61, and it can also absorb the stress applied by the tire 61. By transferring the stress to support member 62, the support member can be made of a rigid material with high inherent strength. This material can effectively maintain its shape during the stress application process, thereby providing effective support and reducing the risk of partial structural deformation of the single-sided support arm 10 and tire 61.

[0063] In this embodiment, the gear reducer 4 includes a primary driving gear 40, a primary driven gear 41 meshed with the primary driving gear 40, a secondary driving gear 42 coaxially connected to the primary driven gear 41, and a secondary driven gear 43 meshed with the secondary driving gear 42. The primary driving gear 40 is sleeved on the output shaft 320 of the planetary carrier 32, and the secondary driven gear 43 is mated with the wheel axle 60. In this embodiment, the primary driven gear 41 and the secondary driving gear 42 are both fixed to a connecting shaft 44, and a fifth bearing 45 and a second bearing 46 are respectively fixed at each end of the connecting shaft 44. The outer ring of the fifth bearing 45 is mated with the inner wall of the reducer housing 5, and the outer ring of the second bearing 46 is mated with the inner wall of the bracket 1, to ensure the stability of the mounting structure of the primary driven gear 41 and the secondary driving gear 42. During operation, the planet carrier 32 rotates to drive the first-stage driving gear 40 to rotate synchronously, and the first-stage driven gear 41 rotates under the drive of the first-stage driving gear 40, and the second-stage driving gear 42 drives the second-stage driving gear 42 to rotate synchronously through the connecting shaft 44, and the second-stage driving gear 42 drives the second-stage driven gear 43 to rotate, and finally drives the tire 61 on the wheel shaft 60 to rotate.

[0064] In this embodiment, at least one roller bearing 63 includes a first tapered roller bearing 630 and a second tapered roller bearing 631. A spacer block 620 is protruding from the inner wall of the support member 62. One side of the first tapered roller bearing 630 abuts against one side of the spacer block 620, and the other side abuts against the secondary driven gear 43. One side of the second tapered roller bearing 631 abuts against the other side of the spacer block 620, and the other side abuts against the second shoulder 600 on the wheel axle 60, thereby preventing the first tapered roller bearing 630 and the second tapered roller bearing 631 from moving along the axial direction of the wheel axle 60.

[0065] The motor 2 and the reducer are respectively located on opposite sides of the bracket; among them, the motor 2 is located on the inner side of the bracket 1, which can make full use of the inner installation space, and the planetary reducer 3 and the gear reducer 4 are located on the outer side of the bracket. The planetary reducer 3 and the gear reducer 4 are radially distributed, which can reduce the space occupied by the drive mechanism assembly.

[0066] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A drive mechanism assembly, comprising a bracket (1) for supporting a vehicle body and a drive member, wherein the drive member is integrated on the bracket (1); The driving member comprises a motor (2), a planetary reducer (3) and a gear reducer (4), wherein the planetary reducer (3) is used to transmit the output power of the motor (2) to the gear reducer (4), and is characterized in that: The planetary reducer (3) comprises: a sun gear (30), the sun gear (30) being driven to rotate by the rotating shaft (20) of the motor (2); A plurality of planetary gears (31), wherein the plurality of planetary gears (31) are uniformly meshed with the outer ring of the sun gear (30); A planet carrier (32), the planet carrier (32) being synchronously connected to the planetary gear (31); a ring gear (33), wherein the inner ring of the ring gear (33) is meshed with the outer gears of the plurality of planetary gears (31), the outer ring of the ring gear (33) is fixed to the bracket (1), the central axis of the ring gear (33), the central axis of the planetary carrier (32) and the central axis of the sun gear (30) coincide with each other, and the ring gear (33) extends in a direction away from the planetary gears (31) to form a first bearing chamber (330); A first bearing (34), the first bearing (34) is located in the first bearing chamber (330), and the outer ring of the first bearing (34) is matched with the inner ring of the gear ring (33), and the inner ring of the first bearing (34) is matched with the outer peripheral surface of the planet carrier (32).

2. The drive mechanism assembly according to claim 1, characterized in that: The connection relationship between the outer ring of the first bearing (34) and the inner ring of the gear ring (33) is a loose fit, and the connection relationship between the inner ring of the first bearing (34) and the outer peripheral surface of the planet carrier (32) is a tight fit.

3. The drive mechanism assembly according to claim 1, characterized in that: A limiting protrusion (321) is convexly provided on the outer peripheral surface of the planet carrier (32), and one side of the first bearing (34) abuts against the limiting protrusion (321), and the other side abuts against the teeth (331) in the inner ring of the gear ring (33).

4. The drive mechanism assembly according to claim 1, characterized in that: The gear ring (33) is made of steel.

5. The drive mechanism assembly according to claim 1, characterized in that: The drive mechanism assembly further comprises a reducer housing (5), the reducer housing (5) being detachably connected to the bracket (1), and the reducer housing (5) being covered on the outside of the planetary reducer (3) and the gear reducer (4).

6. The drive mechanism assembly according to claim 5, characterized in that: A second bearing (35) is mounted on the output shaft (320) of the planetary carrier (32), a second bearing chamber (50) for mounting the second bearing (35) is provided in the reducer housing (5), and the connection relationship between the outer ring of the second bearing (35) and the inner wall of the reducer housing (5) is a loose fit, and the connection relationship between the inner ring of the second bearing (35) and the outer peripheral surface of the output shaft (320) is a tight fit.

7. The drive mechanism assembly according to claim 6, characterized in that: The outer ring of the second bearing (35) is provided with a sealing ring, and the sealing ring abuts against the reducer housing (5).

8. The drive mechanism assembly according to claim 6, characterized in that: A first shaft shoulder (322) is formed on the output shaft (320), and one side of the second bearing (35) abuts against the first shaft shoulder (322), and the other side abuts against the inner wall of the reducer housing (5).

9. The drive mechanism assembly according to claim 5, characterized in that: The outer ring of the gear ring (33) is provided with a plurality of evenly spaced splines (332), and the splines (332) are interference-fitted with the inner sides of the bracket (1) and the reducer housing (5).

10. The drive mechanism assembly according to claim 1, characterized in that: The gear reducer (4) is arranged obliquely in a vertical plane.

11. The drive mechanism assembly according to claim 1, characterized in that: The drive mechanism assembly further includes a plurality of pins (36), the plurality of pins (36) being arranged in a one-to-one correspondence with the plurality of planetary gears (31), one end of the pin (36) being matched with the planetary gear (31), and the other end being interference-fitted with the planetary carrier (32), and a needle bearing (37) being arranged between the pin (36) and the planetary gear (31).

12. The drive mechanism assembly according to claim 1, characterized in that: The invention also includes a wheel assembly (6) that is transmission-connected to the driving member, wherein the wheel assembly (6) includes a wheel shaft (60), a tire (61), a support member (62) and at least one roller bearing (63), wherein the support member (62) is made of steel and is fixed in the bracket (1), wherein the outer ring of the roller bearing (63) abuts against the inner side of the support member (62), and the inner ring of the roller bearing (63) matches the outer periphery of the wheel shaft (60), and one end of the wheel shaft (60) is transmission-connected to the gear reducer (4), and the other end is fixedly connected to the tire (61).

13. The drive mechanism assembly according to claim 12, characterized in that: The bracket (1) is formed with a single-sided support arm (10), and the tire (61) is located on the inner side of the single-sided support arm (10) and is arranged away from the gear reducer (4).

14. The drive mechanism assembly according to claim 13, characterized in that: The support member (62) is used to bear the stress transmitted by the unilateral support arm (10), and the axial length of the support member (62) extends to the tire (61), and is capable of bearing the stress applied by the tire (61).

15. The drive mechanism assembly according to claim 12, characterized in that: The gear reducer (4) comprises a primary driving gear (40), a primary driven gear (41) meshed with the primary driving gear (40), a secondary driving gear (42) coaxially connected to the primary driven gear (41), and a secondary driven gear (43) meshed with the secondary driving gear (42), wherein the primary driving gear (40) is sleeved on an output shaft (320) on the planet carrier (32), and the secondary driven gear (43) is coupled to the wheel shaft (60).

16. The drive mechanism assembly according to claim 15, characterized in that: The at least one roller bearing (63) includes a first tapered roller bearing (630) and a second tapered roller bearing (631); a spacer (620) is protruding from the inner wall of the support member (62); one side of the first tapered roller bearing (630) abuts against one side of the spacer (620), and the other side abuts against the secondary driven gear (43); one side of the second tapered roller bearing (631) abuts against the other side of the spacer (620), and the other side abuts against the second shoulder (600) on the wheel shaft (60).

17. The drive mechanism assembly according to claim 1, characterized in that: The motor (2) includes a housing (21), the housing (21) is fixedly connected to the bracket (1), and a stator (22) and a rotor (23) with a clearance fit with the stator (22) are provided in the housing (21), and the rotor (23) is interference fit with the rotating shaft (20).

18. The drive mechanism assembly according to claim 1, characterized in that: The motor (2) is located inside the bracket (1), the planetary reducer (3) and the gear reducer (4) are located outside the bracket, and the planetary reducer (3) and the gear reducer (4) are distributed radially.

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