Differential wheel and vehicle with same

Abstract

The differential wheel comprises a differential mechanism and a tire, the differential mechanism is connected with the tire and used for driving the tire to rotate, the differential mechanism comprises a first planetary gear assembly, a second planetary gear assembly and a third planetary gear assembly, the first planetary gear assembly comprises a first center shaft, a first center gear, a first planetary gear and a first gear ring. The cover plate is arranged on the side, in the axial direction of the first center shaft, of the differential mechanism, a mounting groove is formed in the surface of the side, facing the differential mechanism, of the cover plate, and the first gear ring is arranged in the mounting groove and fixed to the cover plate. According to the differential wheel disclosed by the utility model, the structure of the differential wheel can be effectively optimized, and the extension amount of the cover plate in the axial direction of the tire is reduced, so that the utilization rate of an installation space is effectively improved, and the compactness of the differential wheel is further effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a differential wheel and a vehicle having the same. Background Technology

[0002] AGV (Automated Guided Vehicle) logistics vehicles are driverless transportation devices that can automatically transport goods or materials from a starting point to a destination without human intervention. They are highly automated and intelligent transportation equipment widely used in manufacturing and other fields. AGV differential wheels are drive wheels widely used in AGV logistics vehicles. By controlling the difference in speed between the left and right drive wheels, a differential speed function is achieved, thereby enabling vehicle steering.

[0003] In the prior art, differentials and motors are usually mounted on differential wheels via connecting flanges. Since the differential structure is relatively complex and requires a certain amount of installation space, while the installation space of differential wheels is limited, in order to meet the installation space requirements of differentials, the hub or cover plate of differential wheels often protrudes a lot, thus affecting the compactness of the structure. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a differential wheel that effectively optimizes the structure of the differential wheel, reduces the amount of the cover plate protruding along the tire axial direction, thereby effectively improving the utilization rate of the installation space and thus effectively improving the compactness of the differential wheel.

[0005] This utility model also proposes a vehicle having the aforementioned differential wheel.

[0006] According to a first aspect of the present invention, a differential wheel includes: a differential and a tire, the differential being connected to the tire for driving the tire to rotate, the differential including: a first planetary gear assembly, the first planetary gear assembly including a first central shaft, a first central gear, a first planetary gear and a first gear ring; a cover plate, the cover plate being disposed on one side of the differential along the axial direction of the first central shaft, the cover plate having a mounting groove formed on the side surface facing the differential, the first gear ring being disposed in the mounting groove and fixed to the cover plate.

[0007] According to the differential wheel of this utility model, a differential, a tire, and a cover plate are arranged in the differential wheel. The differential is connected to the tire and is used to drive the tire to rotate. The differential includes a first planetary gear assembly, which includes a first central shaft, a first central gear, a first planetary gear, and a first gear ring. The cover plate is located on one side of the differential along the axial direction of the first central shaft. A mounting groove is formed on the side surface of the cover plate facing the differential. The first gear ring is located in the mounting groove and fixed to the cover plate. This can effectively optimize the structure of the differential wheel, reduce the amount of the cover plate protruding along the axial direction of the tire, thereby effectively improving the utilization rate of the installation space and thus effectively improving the compactness of the differential wheel.

[0008] In some embodiments, a recessed support groove is formed on the bottom wall of the mounting groove, a first bearing is fixed in the support groove, and one end of the first central shaft is rotatably connected to the cover plate through the first bearing.

[0009] In some embodiments, the differential wheel further includes a coupling, one end of which is connected to the first central shaft, and the other end of which is adapted to connect to the motor shaft of the drive motor.

[0010] In some embodiments, the coupling is integrally formed with the first central shaft; and / or, the first central shaft is integrally formed with the first central gear.

[0011] In some embodiments, the differential further includes a second planetary gear assembly, which is drively connected between the first planetary gear assembly and the tire. The second planetary gear assembly includes a second central shaft, a second central gear, a second planetary gear, and a second gear ring. The tire is fitted over the outside of the second gear ring and fixed to the second gear ring.

[0012] In some embodiments, the cover plate is disposed on one end of the second gear ring and is fixedly connected to the second gear ring.

[0013] In some embodiments, the first planetary gear assembly further includes: a first planetary carrier, the first planetary gear being rotatably mounted on the first planetary carrier via a first planetary shaft, the second central shaft being fixedly connected to the first planetary carrier, and the first planetary gear being configured to drive the second central shaft to rotate via the first planetary carrier when rotating about the first central gear.

[0014] In some embodiments, the second central shaft is sleeved on the outside of the first central shaft, and the first planetary carrier includes: a connecting portion extending axially along the first central shaft and extending circumferentially along the first central shaft in a ring shape, the connecting portion being sleeved on the second central shaft and fixedly connected to the second central shaft; a frame portion connected to the connecting portion and extending radially outward along the first central shaft, one end of the first planetary shaft being connected to the frame portion, and the other end extending axially toward the cover plate along the first central shaft, and the first planetary gear being rotatably sleeved on the first planetary shaft via a second bearing.

[0015] In some embodiments, the connecting portion is interference-fitted with the second central shaft.

[0016] In some embodiments, the first planetary gear and the second planetary gear have the same module and number of teeth.

[0017] In some embodiments, the differential wheel is characterized by further comprising: a connecting flange disposed on the side of the differential facing away from the cover plate in the axial direction of the first central shaft, the connecting flange being used to connect to the vehicle frame; the second planetary gear assembly further comprising: a second planetary carrier fixedly connected to the connecting flange, the second planetary carrier having a second planetary shaft extending axially along the second central shaft, the second planetary gear being rotatably disposed on the second planetary shaft.

[0018] In some embodiments, the second planetary carrier extends axially along the second central axis in a cylindrical shape, and two third bearings are sleeved and fixed on the outer side of the second planetary carrier. The two third bearings are respectively located on both sides of the axial direction of the second planetary gear, and the second gear ring is supported on the second planetary carrier by the two third bearings.

[0019] The vehicle according to the second aspect of the present invention includes a drive motor and a differential wheel according to the first aspect of the present invention, wherein the motor shaft of the drive motor is connected to the first central shaft.

[0020] According to the second aspect of the present invention, by setting the differential wheel of the first aspect, the structure of the differential wheel can be effectively optimized, the amount of the cover plate protruding along the axial direction of the tire can be reduced, thereby effectively improving the utilization rate of the installation space and thus effectively improving the compactness of the differential wheel.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the differential wheel at one angle according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the differential wheel from another angle according to an embodiment of the present utility model;

[0024] Figure 3 This is a cross-sectional view of the differential wheel according to an embodiment of the present utility model;

[0025] Figure 4 This is a schematic diagram of the first planetary gear assembly according to an embodiment of the present utility model at one angle;

[0026] Figure 5 This is a schematic diagram of the first planetary gear assembly according to an embodiment of the present utility model from another angle;

[0027] Figure 6 This is a schematic diagram of the first planetary gear assembly according to another angle of an embodiment of the present utility model;

[0028] Figure 7 This is a schematic diagram of the second planetary gear assembly according to an embodiment of the present utility model;

[0029] Figure 8 This is a schematic diagram of one angle of the second planetary carrier according to an embodiment of the present utility model;

[0030] Figure 9 This is a schematic diagram of the second planetary carrier from another angle according to an embodiment of the present invention;

[0031] Figure 10 This is a transmission diagram of the differential wheel according to an embodiment of the present utility model.

[0032] Figure label:

[0033] 100. Differential gear;

[0034] 10. Differential;

[0035] 11. First planetary gear assembly; 111. First central shaft; 112. First central gear; 113. First planetary gear; 114. First gear ring; 115. First bearing; 116. Coupling; 1161. Third mounting hole; 117. First planetary carrier; 1171. First planetary shaft; 1172. Connecting part; 1173. Carrier body; 118. Second bearing;

[0036] 12. Second planetary gear assembly; 121. Second central shaft; 122. Second central gear; 123. Second planetary gear; 124. Second gear ring; 1241. First mounting hole; 1242. First mounting bolt; 125. Second planetary carrier; 1251. Second planetary shaft; 1252. Retaining ring groove; 1253. Sixth mounting hole; 126. Cylindrical roller bearing; 127. Washer; 128. Third bearing; 129. Retaining ring;

[0037] 20. Tires;

[0038] 30. Cover plate; 31. Second mounting bolt;

[0039] 40. Connecting flange; 41. Fourth mounting hole; 42. Fifth mounting bolt; 43. Seventh mounting hole. Detailed Implementation

[0040] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0041] The following is for reference. Figures 1-10 The differential wheel 100 according to a first aspect embodiment of the present invention is described.

[0042] like Figures 1-6 As shown, the differential wheel 100 according to the first aspect of the present invention includes: a differential 10, a tire 20 and a cover plate 30.

[0043] The differential 10 is connected to the tire 20 and is used to drive the tire 20 to rotate. The differential 10 includes: a first planetary gear 113 assembly 11, which includes a first central shaft 111, a first central gear 112, a first planetary gear 113 and a first gear ring 114; a cover plate 30 is disposed on one side of the differential 10 in the axial direction of the first central shaft 111, and a mounting groove is formed on the side surface of the cover plate 30 facing the differential 10. The first gear ring 114 is disposed in the mounting groove and fixed to the cover plate 30.

[0044] In some specific examples, such as Figure 1 and Figure 2As shown, the tire 20 and the differential 10 are provided with a first mounting hole 1241. The tire 20 is fixed to the differential 10 by a first mounting bolt 1242, so that the driving power can be output to the tire 20 through the differential 10, thereby driving the tire 20 to rotate. Furthermore, the tire 20 can be made of polyurethane material, rubber material, and fiber-reinforced synthetic material, thereby effectively improving the wear resistance and reliability of the tire 20.

[0045] The number of first planetary gears 113 can be multiple; for example, the number of first planetary gears 113 can be three, four, five, six, or more than seven. Multiple first planetary gears 113 mesh with the first central gear 112. In some specific examples, such as... Figure 3 and Figure 4 As shown, the right end of the first central shaft 111 is connected to the first central gear 112, and there are three first planetary gears 113. The multiple first planetary gears 113 mesh evenly and at intervals in the circumferential direction of the first central gear 112, and the first gear ring 114 meshes with the multiple first planetary gears 113.

[0046] When the driving power is output to the first central shaft 111, it can drive the first central shaft 111 to rotate. The first central shaft 111 can drive the first central gear 112 to rotate. Under the driving action of the first central gear 112 and the cooperation of the first gear ring 114, the multiple first planetary gears 113 will not only rotate around their own gear axis, but also revolve around the axis of the first central gear 112. Thus, the driving power can be transmitted from the first central shaft 111 to the multiple first planetary gears 113.

[0047] In some specific examples, such as Figure 2 and Figure 3 As shown, the cover plate 30 is located on the right side of the differential 10 along the axial direction of the first central shaft 111. Furthermore, the cover plate 30 and the differential 10 are provided with second mounting holes. The cover plate 30 is fixed to the differential 10 by second mounting bolts 31, thereby enabling the cover plate 30 and the tire 20 to rotate synchronously. Further, the left side surface of the cover plate 30 has a mounting groove capable of accommodating the first gear ring 114, which is press-fitted into the mounting groove of the cover plate 30.

[0048] In this embodiment, by placing the first gear ring 114 in the mounting groove and fixing it to the cover plate 30, the waste of mounting space caused by the first gear ring 114 and the cover plate 30 occupying independent mounting spaces is avoided. This effectively saves the mounting space required for the differential wheel 100 in the axial direction of the first central shaft 111, thereby effectively reducing the amount of the cover plate 30 protruding in the axial direction of the first central shaft 111. This effectively reduces the size of the differential wheel 100 in the axial direction of the first central shaft 111, making the entire differential wheel 100 smaller and more compact.

[0049] According to the differential wheel 100 of this utility model embodiment, by setting a differential 10, a tire 20 and a cover plate 30 in the differential wheel 100, the differential 10 is connected to the tire 20 and is used to drive the tire 20 to rotate. The differential 10 includes a first planetary gear 113 assembly 11, which includes a first central shaft 111, a first central gear 112, a first planetary gear 113 and a first gear ring 114. The cover plate 30 is disposed on one side of the differential 10 in the axial direction of the first central shaft 111. A mounting groove is formed on the side surface of the cover plate 30 facing the differential 10. The first gear ring 114 is disposed in the mounting groove and fixed to the cover plate 30. This can effectively optimize the structure of the differential wheel 100, reduce the amount of the cover plate 30 extending in the axial direction of the tire 20, thereby effectively improving the utilization rate of the installation space and thus effectively improving the compactness of the differential wheel 100.

[0050] In one embodiment of this utility model, such as Figures 3-5 As shown, a recessed support groove is formed on the bottom wall of the mounting groove, and a first bearing 115 is fixed in the support groove. One end of the first central shaft 111 is rotatably connected to the cover plate 30 through the first bearing 115.

[0051] In some specific examples, such as Figure 3 As shown, the bottom wall of the mounting groove is recessed to the right to form a support groove for accommodating the first bearing 115. The dimensions of the support groove and the first bearing 115 are the same in the axial direction of the first central shaft 111, thereby making full use of the mounting space in the support groove.

[0052] Furthermore, the first bearing 115 is a deep groove ball bearing. The inner ring of the first bearing 115 is fixedly connected to the right end of the first central shaft 111 by press fitting, and the outer ring of the first bearing 115 is fixedly connected to the cover plate 30 by press fitting. The inner and outer rings of the first bearing 115 are rotatably connected. In other words, the first central shaft 111 is rotatably connected to the cover plate 30 through the first bearing 115.

[0053] In this embodiment, a recessed support groove is formed on the bottom wall of the mounting groove, and a first bearing 115 is fixed in the support groove. One end of the first central shaft 111 is rotatably connected to the cover plate 30 through the first bearing 115. This not only saves installation space, but also provides a reliable support point for one end of the first central shaft 111, thereby effectively improving the stability and reliability of the first central shaft 111.

[0054] In one embodiment of this utility model, such as Figure 4 As shown, the differential wheel 100 also includes a coupling 116, one end of which is connected to the first central shaft 111, and the other end is adapted to connect to the motor shaft of the drive motor.

[0055] In some specific examples, such as Figure 4 As shown, the right end of coupling 116 is connected to the first central shaft 111, and the left end of coupling 116 is connected to the motor shaft of the drive motor. Coupling 116 ensures that the driving power output from the motor shaft of the drive motor is smoothly and efficiently transmitted to the first central shaft 111, reducing power loss during transmission and ensuring stable transmission of driving power. In addition, coupling 116 also has a certain buffering effect, reducing the impact of impact loads on differential 10.

[0056] In this embodiment, by setting a coupling 116 in the differential 10, one end of the coupling 116 is connected to the first central shaft 111, and the other end is adapted to connect to the motor shaft of the drive motor. This not only effectively improves the efficiency and stability of the drive power transmission, but also effectively reduces the impact of impact load on the differential 10, thereby effectively protecting the differential 10.

[0057] In one embodiment of this utility model, such as Figures 3-6 As shown, the coupling 116 is integrally formed with the first central shaft 111; and / or, the first central shaft 111 is integrally formed with the first central gear 112.

[0058] For example, coupling 116 is integrally formed with the first central shaft 111; or, the first central shaft 111 is integrally formed with the first central gear 112; or, coupling 116 is integrally formed with the first central shaft 111 and the first central shaft 111 is integrally formed with the first central gear 112. In some specific examples, such as... Figure 3 and Figure 4 As shown, the coupling 116 is integrally formed with the first central shaft 111, and the first central shaft 111 is integrally formed with the first central gear 112. Furthermore, the coupling 116 is located at the left end of the first central shaft 111, and the first central gear 112 is located at the right end of the first central shaft 111 and is located to the left of the first bearing 115.

[0059] In addition, such as Figure 4and Figure 6 As shown, the coupling 116 is provided with a third mounting hole 1161, and a third mounting bolt is provided in the third mounting hole 1161. When installing the motor shaft of the drive motor with the coupling 116, first snap the right end of the motor shaft of the drive motor onto the coupling 116, and then tighten the third mounting bolt in the third mounting hole 1161 to fix the motor shaft of the drive motor onto the coupling 116.

[0060] In this embodiment, the coupling 116 and the first central shaft 111 are integrally formed, and / or the first central shaft 111 and the first central gear 112 are integrally formed, which can effectively improve the structural strength of the first planetary gear 113 assembly 11, thereby effectively improving the durability of the first planetary gear 113 assembly 111. In addition, it can also simplify the assembly process of the first planetary gear 113 assembly 111, thereby effectively improving the assembly efficiency of the first planetary gear 113 assembly 111.

[0061] In one embodiment of this utility model, such as Figure 3 and Figure 7 As shown, the differential 10 also includes a second planetary gear 123 assembly 12, which is connected between the first planetary gear 113 assembly 11 and the tire 20. The second planetary gear 123 assembly 12 includes a second central shaft 121, a second central gear 122, a second planetary gear 123, and a second gear ring 124. The tire 20 is fitted on the outside of the second gear ring 124 and fixed to the second gear ring 124.

[0062] It should be noted that a transmission connection refers to connecting two or more components together through a certain assembly method to achieve the transmission of force or power. A transmission connection can effectively transfer force or power from one component to another, thereby enabling the entire system to operate normally. The two components in a transmission connection can be directly or indirectly connected, as long as the transmission of force is achieved.

[0063] The number of second planetary gears 123 can be multiple; for example, the number of second planetary gears 123 can be three, four, five, six, or more than seven, and multiple second planetary gears 123 mesh with the second central gear 122. In some specific examples, such as... Figure 3 and Figure 7 As shown, the second central shaft 121 is connected to the second central gear 122, and there are three second planetary gears 123. The multiple second planetary gears 123 mesh evenly and at intervals in the circumferential direction of the second central gear 122, and the second gear ring 124 meshes with the multiple second planetary gears 123.

[0064] When the driving power is transmitted from the first planetary gear 113 assembly 11 to the second central shaft 121, it can drive the second central shaft 121 to rotate. The second central shaft 121 can drive the second central gear 122 to rotate. The rotation of the first central gear 112 can drive multiple second planetary gears 123 to rotate around their own gear axes. The multiple second planetary gears 123 can drive the second gear ring 124 to rotate on a fixed axis. The second gear ring 124 can ultimately drive the tire 20 to rotate.

[0065] In other words, one end of the second planetary gear 123 assembly 12 is connected to the first planetary gear 113 assembly 11 for transmission, and the other end of the second planetary gear 123 assembly 12 is connected to the tire 20 for transmission. The driving power is input from the motor shaft of the drive motor to the first planetary gear 113 assembly 11, and then transmitted to the tire 20 through the second planetary gear 123 assembly 12, ultimately driving the rotation of the tire 20.

[0066] Furthermore, such as Figure 3 As shown, the tire 20 and the second gear ring 124 are provided with a first mounting hole 1241. The tire 20 is fixed to the outer side of the second gear ring 124 in the radial direction by a first mounting bolt 1242, so that the driving power can be output to the tire 20 through the second gear ring 124, thereby driving the tire 20 to rotate.

[0067] In this embodiment, a second planetary gear 123 assembly 12 is provided in the differential 10. The second planetary gear 123 assembly 12 is connected between the first planetary gear 113 assembly 11 and the tire 20. The second planetary gear 123 assembly 12 includes a second central shaft 121, a second central gear 122, a second planetary gear 123, and a second gear ring 124. The tire 20 is sleeved on the outside of the second gear ring 124 and fixed to the second gear ring 124. This can further reduce the speed output to the tire 20 and further increase the torque output to the tire 20, thereby further realizing the deceleration and torque increase of the differential 10.

[0068] In one embodiment of this utility model, such as Figure 3 As shown, the cover plate 30 covers one end of the second gear ring 124 and is fixedly connected to the second gear ring 124.

[0069] In some specific examples, such as Figure 3As shown, the cover plate 30 covers the right side of the second gear ring 124 axially on the first central shaft 111. Furthermore, the cover plate 30 and the second gear ring 124 are provided with second mounting holes. The cover plate 30 is fixed to the right side of the second gear ring 124 by second mounting bolts 31, thereby enabling the cover plate 30 and the tire 20 to rotate synchronously. This allows the cover plate 30 to be integrated onto the second gear ring 124, further saving installation space. In addition, the cover plate 30 covering the second gear ring 124 provides an additional physical barrier for the internal differential 10, preventing the entry of external contaminants such as dust and debris, thus effectively protecting the differential 10.

[0070] In this embodiment, by covering one end of the second gear ring 124 with the cover plate 30 and fixing it to the second gear ring 124, not only can the installation space of the cover plate 30 be further saved, but it can also provide an additional physical barrier for the differential 10, thereby effectively protecting the differential 10 and extending the service life of the differential 10.

[0071] In one embodiment of this utility model, such as Figures 4-6 As shown, the first planetary gear 113 assembly 11 further includes: a first planetary carrier 117, the first planetary gear 113 being rotatably mounted on the first planetary carrier 117 via a first planetary shaft 1171, and a second central shaft 121 being fixedly connected to the first planetary carrier 117. The first planetary gear 113 is configured to drive the second central shaft 121 to rotate via the first planetary carrier 117 when rotating around the first central gear 112.

[0072] In some specific examples, such as Figures 4-6 As shown, there are three first planetary gears 113 and three first planetary shafts 1171, and the first planetary gears 113 and the first planetary shafts 1171 are arranged in a one-to-one correspondence. The left end of the first planetary shaft 1171 is fixedly connected to the first planetary carrier 117, and the right end of the first planetary shaft 1171 extends to the right along the axial direction of the first central shaft 111.

[0073] When the driving power is transmitted to the multiple first planetary gears 113, the multiple first planetary gears 113 will not only rotate around their own gear axes, but also revolve around the axis of the first central gear 112. The multiple first planetary gears 113 can drive the first planetary carrier 117 to rotate around the axis of the first central shaft 111 by revolving around the axis of the first central shaft 112. Since the second central shaft 121 is fixedly connected to the first planetary carrier 117, the first planetary carrier 117 can drive the second central shaft 121 to rotate. Thus, the driving power can be transmitted from the first planetary gear 113 assembly 11 to the second planetary gear 123 assembly 12.

[0074] In this embodiment, by setting a first planetary carrier 117 in the first planetary gear 113 assembly 11, the first planetary gear 113 is rotatably mounted on the first planetary carrier 117 via a first planetary shaft 1171, and the second central shaft 121 is fixedly connected to the first planetary carrier 117, the first planetary gear 113 is configured to drive the second central shaft 121 to rotate via the first planetary carrier 117 when rotating around the first central gear 112. This ensures that the driving power is transmitted from the first planetary gear 113 assembly 11 to the second planetary gear 123 assembly 12, thereby effectively realizing the transmission of driving power and improving the reliability of the differential 10.

[0075] In one embodiment of this utility model, such as Figures 3-6 As shown, the second central shaft 121 is sleeved on the outside of the first central shaft 111, and the first planetary carrier 117 includes a connecting part 1172 and a carrier part 1173.

[0076] The connecting part 1172 extends axially along the first central axis 111 and extends in a ring shape along the circumference of the first central axis 111. The connecting part 1172 is sleeved on the second central axis 121 and fixedly connected to the second central axis 121. The frame part 1173 is connected to the connecting part 1172 and extends radially outward along the first central axis 111. One end of the first planetary shaft 1171 is connected to the frame part 1173, and the other end extends axially toward the cover plate 30 along the first central axis 111. The first planetary gear 113 is rotatably sleeved on the first planetary shaft 1171 through the second bearing 118.

[0077] In some specific examples, such as Figure 3 As shown, the second central shaft 121 extends axially into a cylindrical shape. The second central shaft 121 is sleeved on the outside of the first central shaft 111. A connecting portion 1172 is sleeved on the right end of the second central shaft 121 and fixedly connected to the right end of the second central shaft 121. Thus, driving power can be transmitted from the connecting portion 1172 to the second central shaft 121. Further, as... Figure 3 and Figure 6 As shown, the frame part 1173 is fixed to the right end of the connecting part 1172, the left end of the first planetary shaft 1171 is connected to the frame part 1173, and the right end of the first planetary shaft 1171 extends to the right along the axial direction of the first central shaft 111.

[0078] In addition, such as Figure 4 and Figure 5As shown, the second bearing 118 is disposed between the first planetary shaft 1171 and the first planetary gear 113. Further, the second bearing 118 is a deep groove ball bearing. The inner ring of the second bearing 118 is fixedly connected to the right end of the first planetary shaft 1171 by press fitting, and the outer ring of the second bearing 118 is fixedly connected to the first planetary gear 113 by press fitting. The inner and outer rings of the second bearing 118 are rotatably connected, meaning that the first planetary shaft 1171 is rotatably connected to the first planetary gear 113 via the second bearing 118. In some specific examples, the second bearing 118 and the first bearing 115 use the same model, thereby effectively improving assembly convenience and reducing costs.

[0079] In this embodiment, the second central shaft 121 is sleeved on the outside of the first central shaft 111, and a connecting part 1172 and a frame part 1173 are provided in the first planetary carrier 117. The connecting part 1172 extends axially along the first central shaft 111 and extends in a ring shape circumferentially along the first central shaft 111. The connecting part 1172 is sleeved on the second central shaft 121 and fixedly connected to the second central shaft 121. The frame part 1173 is connected to the connecting part 1172 and extends radially outward along the first central shaft 111. One end of the first planetary shaft 1171 is connected to the frame 1173, and the other end extends axially toward the cover plate 30 along the first central shaft 111. The first planetary gear 113 is rotatably mounted on the first planetary shaft 1171 through the second bearing 118. This not only optimizes the structure of the first planetary gear 113 assembly 11 and the second planetary gear 123 assembly 12, thereby further improving the utilization rate of the installation space, but also effectively reduces gear wear and noise, thereby effectively improving the durability of the differential 10.

[0080] In one embodiment of this utility model, such as Figure 3 As shown, the connecting part 1172 is interference-fitted with the second central shaft 121.

[0081] In some specific examples, such as Figure 3 As shown, the connecting part 1172 is sleeved on the right end of the second central shaft 121 and the connecting part 1172 and the right end of the second central shaft 121 are connected by an interference fit. That is to say, the inner diameter of the connecting part 1172 is slightly smaller than the outer diameter of the second central shaft 121.

[0082] This allows the connecting portion 1172 to fit tightly against the second central shaft 121, generating strong friction and normal pressure between them, thereby effectively enhancing the connection strength. Furthermore, the interference fit ensures a uniform stress distribution between the connecting portion 1172 and the second central shaft 121, reducing the possibility of loosening and effectively improving the fatigue resistance of the connection between them.

[0083] In this embodiment, by setting the connection between the connecting part 1172 and the second central shaft 121 as an interference fit, it can not only effectively improve the connection strength between the connecting part 1172 and the second central shaft 121, but also effectively improve the fatigue resistance of the connection between the connecting part 1172 and the second central shaft 121, thereby ensuring the stability and reliability of the drive power transmission.

[0084] In one embodiment of this utility model, such as Figure 3 As shown, the first planetary gear 113 and the second planetary gear 123 have the same module and number of teeth.

[0085] Since the first planetary gear 113 and the second planetary gear 123 use the same module and number of teeth, multiple first planetary gears 113 and second planetary gears 123 can be connected in series for hobbing, grinding and other processes, thereby effectively simplifying the processing flow of the first planetary gear 113 and the second planetary gear 123, thereby effectively improving the processing efficiency of the first planetary gear 113 and the second planetary gear 123, and effectively reducing the processing cost.

[0086] In some specific examples, such as Figure 3 As shown, since the torque borne by the first planetary gear 113 is smaller and the torque borne by the second planetary gear 123 is larger, the axial thickness of the first planetary gear 113 is smaller than that of the second planetary gear 123, thereby effectively improving the material utilization rate of the first planetary gear 113 and the second planetary gear 123.

[0087] This embodiment sets the module and number of teeth of the first planetary gear 113 and the second planetary gear 123 to be the same, which can effectively simplify the processing flow of the first planetary gear 113 and the second planetary gear 123, thereby effectively improving the processing efficiency of the first planetary gear 113 and the second planetary gear 123 and effectively reducing the processing cost.

[0088] In one embodiment of this utility model, such as Figure 1 , Figure 3 and Figures 7-9As shown, the differential wheel 100 also includes a connecting flange 40, which is located on the side of the differential 10 away from the cover plate 30 in the axial direction of the first central shaft 111. The connecting flange 40 is used to connect to the frame. The second planetary gear 123 assembly 12 also includes a second planetary carrier 125, which is fixedly connected to the connecting flange 40. The second planetary carrier 125 is provided with a second planetary shaft 1251 extending axially along the second central shaft 121. The second planetary gear 123 is rotatably mounted on the second planetary shaft 1251.

[0089] In some specific examples, such as Figure 1 and Figure 3 As shown, the connecting flange 40 is located on the left side of the differential 10. Furthermore, the connecting flange 40 and the frame are provided with a fourth mounting hole 41, and a fourth mounting bolt is provided in the fourth mounting hole 41, thereby enabling the connecting flange 40 to be fixed on the frame.

[0090] For example Figure 1 and Figure 3 As shown, a fifth mounting hole is provided on the connecting flange 40 and the second planetary carrier 125, and a fifth mounting bolt 42 is provided in the fifth mounting hole, thereby enabling the second planetary carrier 125 to be fixed to the connecting flange 40. For example Figures 7-9 As shown, the second planetary carrier 125 is provided with a sixth mounting hole 1253, the second planetary shaft 1251 passes through the sixth mounting hole 1253, and the second planetary gear 123 is rotatably mounted on the second planetary shaft 1251.

[0091] Furthermore, such as Figure 3 As shown, a cylindrical roller bearing 126 is provided between the second planetary shaft 1251 and the second planetary gear 123. The inner ring of the cylindrical roller bearing 126 is press-fitted onto the second planetary shaft 1251, and the outer ring of the second planetary shaft 1251 is press-fitted onto the second planetary gear 123, thereby enabling a rotatable connection between the second planetary shaft 1251 and the second planetary gear 123. Shims 127 are provided on both sides of the second planetary gear 123 in the axial direction, and the shims 127 are fitted onto the second planetary shaft 1251, thereby reducing wear on the second planetary gear 123. Furthermore, the shims 127 can be made of bronze, thereby effectively improving wear resistance.

[0092] In addition, for example Figure 1 As shown, the connecting flange 40 is also provided with a seventh mounting hole 43. The drive motor can be fixed on the connecting flange 40 by the seventh mounting bolt. This can effectively improve the stability of the drive motor and ensure that the motor shaft of the drive motor can stably output driving power.

[0093] In this embodiment, by providing a connecting flange 40 in the differential wheel 100, the connecting flange 40 is located on the side of the differential 10 facing away from the cover plate 30 in the axial direction of the first central shaft 111. The connecting flange 40 is used to connect to the frame, which can reliably fix the differential wheel 100 to the frame through the connecting flange 40, thereby effectively improving the stability of the differential wheel 100. By providing a second planetary carrier 125 in the second planetary gear 123 assembly 12, the second planetary carrier 125 is fixedly connected to the connecting flange 40. The second planetary carrier 125 is provided with a second planetary shaft 1251 extending axially along the second central shaft 121. The second planetary gear 123 is rotatably mounted on the second planetary shaft 1251. This can effectively optimize the structure of the second planetary gear 123 assembly 12 and effectively improve the stability of the second planetary carrier 125, thereby ensuring that the driving power can be transmitted efficiently and smoothly in the second planetary gear 123 assembly 12.

[0094] In one embodiment of this utility model, such as Figure 3 and Figures 7-9 As shown, the second planetary carrier 125 extends in a cylindrical shape along the axial direction of the second central shaft 121. Two third bearings 128 are sleeved and fixed on the outer side of the second planetary carrier 125. The two third bearings 128 are located on both sides of the axial direction of the second planetary gear 123, and the second gear ring 124 is supported on the second planetary carrier 125 by the two third bearings 128.

[0095] In some specific examples, the third bearing 128 is a deep groove ball bearing. The inner ring of the third bearing 128 is press-fitted onto the second planetary carrier 125, and the outer ring of the third bearing 128 is press-fitted onto the second gear ring 124. The inner and outer rings of the third bearing 128 are rotatably connected. That is, the second gear ring 124 is rotatably connected to the second planetary carrier 125 through two third bearings 128.

[0096] Furthermore, such as Figures 7-9 As shown, the left end of the third bearing 128 located on the left abuts against the right side of the connecting flange 40, and its right end abuts against the left end of the second planetary shaft 1251. A retaining ring groove 1252 is provided at the right end of the second planetary carrier 125, and a retaining ring 129 is disposed in the retaining ring groove 1252. The left end of the third bearing 128 located on the right abuts against the right end of the second planetary shaft 1251, and its right end abuts against the retaining ring 129. This effectively restricts the movement of the two third bearings 128 in the axial direction of the second central shaft 121, thereby effectively improving the stability of the third bearings 128.

[0097] In this embodiment, the second planetary carrier 125 is extended into a cylindrical shape along the axial direction of the second central shaft 121. Two third bearings 128 are sleeved and fixed on the outer side of the second planetary carrier 125. The two third bearings 128 are located on both sides of the axial direction of the second planetary gear 123. The second gear ring 124 is supported on the second planetary carrier 125 by the two third bearings 128. This can effectively optimize the structure of the second planetary gear 123 assembly 12, thereby effectively reducing the resistance and noise of the rotation of the second gear ring 124, and thus effectively improving the transmission efficiency of the driving power in the second planetary gear 123 assembly 12.

[0098] The vehicle according to the second aspect of the present invention includes a drive motor and a differential wheel 100 according to the first aspect of the present invention, wherein the motor shaft of the drive motor is connected to a first central shaft 111.

[0099] According to the vehicle of the present utility model embodiment, by setting the differential wheel 100 of the first aspect, the structure of the differential wheel 100 can be effectively optimized, the extension of the cover plate 30 along the axial direction of the tire 20 can be reduced, thereby effectively improving the utilization rate of the installation space and thus effectively improving the compactness of the differential wheel 100.

[0100] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0101] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0102] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0103] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0104] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A differential wheel (100), characterized in that, include: A differential (10) and a tire (20), the differential (10) being connected to the tire (20) for driving the tire (20) to rotate, the differential (10) including: a first planetary gear (113) assembly (11), the first planetary gear (113) assembly (11) including a first central shaft (111), a first central gear (112), a first planetary gear (113) and a first gear ring (114); A cover plate (30) is provided on one side of the differential (10) in the axial direction of the first central shaft (111). The surface of the cover plate (30) facing the differential (10) has a mounting groove. The first gear ring (114) is provided in the mounting groove and fixed to the cover plate (30).

2. The differential wheel (100) according to claim 1, characterized in that, A recessed support groove is formed on the bottom wall of the mounting groove, and a first bearing (115) is fixed in the support groove. One end of the first central shaft (111) is rotatably connected to the cover plate (30) through the first bearing (115).

3. The differential wheel (100) according to claim 1, characterized in that, Also includes: A coupling (116) is provided, one end of which is connected to the first central shaft (111), and the other end of which is adapted to connect to the motor shaft of the drive motor.

4. The differential wheel (100) according to claim 3, characterized in that, The coupling (116) is integrally formed with the first central shaft (111); and / or, the first central shaft (111) is integrally formed with the first central gear (112).

5. The differential wheel (100) according to claim 1, characterized in that, The differential (10) further includes a second planetary gear (123) assembly (12), which is connected between the first planetary gear (113) assembly (11) and the tire (20). The second planetary gear (123) assembly (12) includes a second central shaft (121), a second central gear (122), a second planetary gear (123), and a second gear ring (124). The tire (20) is fitted on the outside of the second gear ring (124) and fixed to the second gear ring (124).

6. The differential wheel (100) according to claim 5, characterized in that, The cover plate (30) is placed over one end of the second toothed ring (124) and is fixedly connected to the second toothed ring (124).

7. The differential wheel (100) according to claim 5, characterized in that, The first planetary gear (113) assembly (11) further includes: a first planetary carrier (117), the first planetary gear (113) being rotatably mounted on the first planetary carrier (117) via a first planetary shaft (1171), the second central shaft (121) being fixedly connected to the first planetary carrier (117), and the first planetary gear (113) being configured to drive the second central shaft (121) to rotate via the first planetary carrier (117) when rotating around the first central gear (112).

8. The differential wheel (100) according to claim 7, characterized in that, The second central shaft (121) is sleeved on the outside of the first central shaft (111), and the first planetary carrier (117) includes: A connecting part (1172) extends axially along the first central axis (111) and extends circumferentially along the first central axis (111) in a ring shape. The connecting part (1172) is sleeved on the second central axis (121) and fixedly connected to the second central axis (121). The frame part (1173) is connected to the connecting part (1172) and extends radially outward along the first central axis (111). One end of the first planetary shaft (1171) is connected to the frame part (1173), and the other end extends axially toward the cover plate (30) along the first central axis (111). The first planetary gear (113) is rotatably mounted on the first planetary shaft (1171) through the second bearing (118).

9. The differential wheel (100) according to claim 8, characterized in that, The connecting part (1172) is interference-fitted with the second central shaft (121).

10. The differential wheel (100) according to claim 5, characterized in that, The first planetary gear (113) and the second planetary gear (123) have the same module and number of teeth.

11. The differential wheel (100) according to claim 5, characterized in that, Also includes: A connecting flange (40) is provided on the side of the differential (10) facing away from the cover plate (30) in the axial direction of the first central shaft (111). The connecting flange (40) is used to connect to the vehicle frame. The second planetary gear (123) assembly (12) further includes: a second planetary carrier (125), the second planetary carrier (125) being fixedly connected to the connecting flange (40), the second planetary carrier (125) being provided with a second planetary shaft (1251) extending axially along the second central shaft (121), and the second planetary gear (123) being rotatably disposed on the second planetary shaft (1251).

12. The differential wheel (100) according to claim 11, characterized in that, The second planetary carrier (125) extends in a cylindrical shape along the axial direction of the second central shaft (121). Two third bearings (128) are sleeved and fixed on the outer side of the second planetary carrier (125). The two third bearings (128) are located on the axial sides of the second planetary gear (123) respectively. The second gear ring (124) is supported on the second planetary carrier (125) by the two third bearings (128).

13. A vehicle, characterized in that, It includes a drive motor and a differential wheel (100) according to any one of claims 1-12, wherein the motor shaft of the drive motor is connected to the first central shaft (111).

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