Connecting structure of driving shaft and hub and transmission system

Abstract

The invention discloses a driving shaft and hub connecting structure and a transmission system, and relates to the field of automobile manufacturing, the driving shaft and hub connecting structure comprises a driving shaft sleeve, a driving shaft, a hub and a hub, the hub is rotationally connected with the periphery of the other end of the driving shaft sleeve; the driving shaft penetrates through the through hole in the driving shaft sleeve, and a limiting step is arranged at the matching position of the driving shaft and the limiting groove; the supporting bearing is arranged on the limiting step in a sleeving mode, and the supporting bearing is further installed in the limiting groove; and the limiting assembly is connected with the end, away from the limiting step, of the driving shaft and the hub, and the limiting assembly is matched with the supporting bearing to limit axial and radial deviation of the driving shaft. By arranging the supporting bearing and the limiting assembly connected with the driving shaft and the hub, the axial and radial deviation of the driving shaft relative to the hub and the driving shaft sleeve is limited, and it is ensured that when the transmission torque of the driving shaft changes suddenly, the situation that a spline on the hub is impacted due to the axial and radial deviation, and friction abnormal sound is generated is avoided.

Description

Technical Field

[0001] This invention relates to the field of automobile manufacturing, and more specifically to a connection structure between a drive shaft and a wheel hub, and a transmission system. Background Technology

[0002] During vehicle operation, the drive shaft is responsible for transmitting the rotational speed and torque from the powertrain, such as the engine or electric motor, to the wheels, thereby driving the wheels forward. In the prior art, the drive shaft passes through the wheel hub assembly and is connected by a spline. The hub end is usually secured with a lock nut, forming an assembly of the drive shaft and the wheel hub assembly.

[0003] However, there is a gap between the drive shaft and the hub due to the spline connection and assembly. When the transmitted torque changes abruptly, the drive shaft will impact the spline on the hub due to axial and radial offset, resulting in abnormal friction noise. Summary of the Invention

[0004] This invention provides a connection structure and transmission system for a drive shaft and a hub, which can solve the problem of friction noise caused by the drive shaft impacting the splines on the hub due to axial and radial offset when the transmitted torque changes abruptly.

[0005] In a first aspect, embodiments of the present invention provide a connection structure between a drive shaft and a wheel hub, comprising: The drive shaft sleeve has a through hole inside and a limiting groove at one end; The hub is rotatably connected to the outer circumference of the other end of the drive shaft sleeve; A drive shaft passes through the internal through hole of the drive shaft sleeve, and a limiting step is provided at the point where the drive shaft mates with the limiting groove. A support bearing is sleeved on the limiting step, and the support bearing is also installed in the limiting groove; A limiting component is connected to the end of the drive shaft away from the limiting step and the wheel hub. The limiting component cooperates with the support bearing to limit the axial and radial displacement of the drive shaft.

[0006] In conjunction with the first aspect, in one embodiment, a first locking hole is provided on the side of the drive shaft connected to the limiting component; The limiting component includes: An end cap, wherein a first through hole is provided in the middle, and the end cap is fixedly connected to the wheel hub; A connecting bolt passes through the first through hole and connects to the first locking hole.

[0007] In conjunction with the first aspect, in one embodiment, the limiting component further includes: A center seat ring is fitted between the first through hole and the connecting bolt.

[0008] In conjunction with the first aspect, in one embodiment, the central seat ring includes: The seat ring body has a through second hole in the middle, and the seat ring body is fitted inside the first through hole; A limiting part is provided on one side of the seat ring body, and the limiting part abuts against the end cap.

[0009] In conjunction with the first aspect, in one embodiment, the thickness of the seat body is greater than the thickness of the end cap.

[0010] In conjunction with the first aspect, in one implementation, it includes: Locking bolts; The end cap is provided with a second locking hole, and the locking bolt passes through the second locking hole and is connected to the wheel hub.

[0011] In conjunction with the first aspect, in one embodiment, the connecting bolt includes: The bolt head has an outer diameter larger than the inner diameter of the first through hole; The screw has one end connected to the bolt head and the other end passing through the first through hole and screwed into the first locking hole.

[0012] In conjunction with the first aspect, in one implementation, it includes: A bearing is disposed between the hub and the drive shaft sleeve.

[0013] In conjunction with the first aspect, in one embodiment, the drive shaft and the hub are connected by an involute spline.

[0014] Secondly, embodiments of the present invention provide a transmission system, including the aforementioned connection structure between the drive shaft and the wheel hub.

[0015] The beneficial effects of the technical solutions provided by the embodiments of the present invention include: This invention discloses a connection structure and transmission system for a drive shaft and a hub. The connection structure includes: a drive shaft sleeve with a through hole and a limiting groove at one end; a hub rotatably connected to the other end of the drive shaft sleeve; a drive shaft passing through the through hole in the drive shaft sleeve, with a limiting step at the point where the drive shaft mates with the limiting groove; a support bearing fitted onto the limiting step and also installed within the limiting groove; and a limiting component connected to the hub at the end of the drive shaft away from the limiting step, the limiting component cooperating with the support bearing to restrict axial and radial displacement of the drive shaft. By providing a support bearing and a limiting component connected to the drive shaft and hub, this invention restricts the axial and radial displacement of the drive shaft relative to the hub and drive shaft sleeve, ensuring that the drive shaft will not impact the splines on the hub due to axial and radial displacement when the transmitted torque changes abruptly, thus preventing frictional noise. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A cross-sectional view of an embodiment of the connection structure between the drive shaft and the wheel hub; Figure 2 Exploded view of the limiting component in an embodiment of the connection structure between the drive shaft and the wheel hub; Figure 3 Front view of the limiting component in an embodiment of the connection structure between the drive shaft and the wheel hub; Figure 4 A perspective view of a drive shaft according to an embodiment of the connection structure between the drive shaft and the wheel hub; Figure 5 A perspective view of the drive shaft sleeve, which is an embodiment of the connection structure between the drive shaft and the hub.

[0018] In the diagram: 10, drive shaft; 11, locking hole; 12, limiting step; 20, hub; 30, limiting assembly; 31, end cap; 311, locking hole; 312, first through hole; 32, center seat ring; 321, limiting part; 322, seat ring body; 323, second through hole; 33, connecting bolt; 331, bolt head; 332, screw; 34, locking bolt; 40, support bearing; 41, third through hole; 50, drive shaft sleeve; 51, limiting groove; 60, bearing. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1 , 4 As shown in Figure 5, an embodiment of the present invention discloses a connection structure between a drive shaft and a wheel hub, comprising: a drive shaft sleeve 50, which has a through hole inside and a limiting groove 51 at one end; a wheel hub 20, which is rotatably connected to the other end of the drive shaft sleeve 50; a drive shaft 10, which passes through the through hole inside the drive shaft sleeve 50, and a limiting step 12 is provided at the point where the drive shaft 10 mates with the limiting groove 51; a support bearing 40, which is sleeved on the limiting step 12, and the support bearing 40 is also installed in the limiting groove 51; and a limiting component 30, which is connected to the end of the drive shaft 10 away from the limiting step 12 and the wheel hub 20, and the limiting component 30 mates with the support bearing 40 to limit the axial and radial displacement of the drive shaft 10.

[0021] One end of the drive shaft sleeve 50 is provided with a limiting groove 51, and a through hole is provided inside. The drive shaft sleeve 50 is fixedly connected to other structures of the vehicle body. Its main function is to reduce friction and wear of the shaft during movement, and to provide support and guidance. At the same time, with the help of lubricant, it ensures smooth rotation of the drive shaft and extends the service life of the components.

[0022] The hub 20 is rotatably connected to the outer periphery of the drive shaft sleeve 50.

[0023] The drive shaft 10 passes through the through hole of the drive shaft sleeve 50 and can rotate relative to the drive shaft sleeve 50. One end of the drive shaft 10 is connected to the power output end of the vehicle, and the other end is connected to the wheel hub 20. The power output end of the vehicle and the wheel hub 20 are connected and transmitted through the drive shaft 10. A limiting step 12 is also provided on the drive shaft 10 at a position opposite to the limiting groove 51. A support bearing 40 is provided between the limiting groove 51 and the limiting step 12. A third through hole 41 is provided on the support bearing 40, and the inner wall of the third through hole 41 contacts the outer wall of the limiting step 12.

[0024] A limiting assembly 30 is disposed on the side of the drive shaft 10 away from the limiting step 12, and the limiting assembly 30 is connected to both the drive shaft 10 and the wheel hub 20. Further, the limiting assembly 30 includes a connecting bolt 33 fixedly connected to the drive shaft 10 and an end cap 31 fixedly connected to the wheel hub 20. The end cap 31 restricts the connecting bolt 33 to rotate only along its axis.

[0025] During assembly, first install the hub 20 onto the outer periphery of the drive shaft sleeve 50, then sleeve the support bearing 40 onto the limiting step 12, and then pass the drive shaft 10 through the through hole inside the drive shaft sleeve 50 from the side where the limiting groove 51 is provided. Finally, use the limiting assembly 30 to connect the hub 20 to both the drive shaft 10 and the hub 20 on the side of the hub 20 away from the drive shaft sleeve 50.

[0026] After assembly, the hub 20 can rotate relative to the drive shaft sleeve 50 under the drive of the drive shaft 10. Since the limiting component 30 is connected to both the drive shaft 10 and the hub 20, the drive shaft 10 and the hub 20 always rotate in the same direction under the limiting action of the limiting component 30 and the support bearing 40, effectively preventing radial displacement of the drive shaft 10 relative to the hub 20. After the connecting bolt 33 of the limiting component 30 is fixedly connected to the drive shaft 10, the bolt head 331 and the drive shaft 10 are respectively located on both sides of the end cover 31. With the cooperation of the end cover 31, the connecting bolt 33, and the support bearing 40, the drive shaft 10 does not move axially.

[0027] This invention limits the axial and radial offset of the drive shaft relative to the hub and drive shaft sleeve by setting a support bearing and a limiting component connected to the drive shaft and hub. This ensures that when the drive shaft transmits torque suddenly, it will not impact the spline on the hub due to axial and radial offset, thus preventing friction noise.

[0028] like Figure 1 , 2 As shown, in one embodiment, the drive shaft 10 is provided with a first locking hole 11 on the side connected to the limiting component 30; the limiting component 30 includes: an end cap 31, the middle of which is provided with a first through hole 312, the end cap 31 being fixedly connected to the hub 20; and a connecting bolt 33, which passes through the first through hole 312 and is connected to the first locking hole 11.

[0029] When installing the limiting component 30, first fix the end cover 31 to the hub 20, then use the connecting bolt 33 to pass through the first through hole 312 on the end cover 31 from one side, and screw it into the first locking hole 11 on the drive shaft 10. After the connecting bolt 33 is fixedly connected to the drive shaft 10, the connection bolt 33 and the end cover 31 cooperate to limit the axial displacement of the drive shaft 10.

[0030] like Figure 1 , 2 As shown, in one embodiment, the limiting component 30 further includes a central seat ring 32, which is sleeved between the first through hole 312 and the connecting bolt 33.

[0031] The center seat ring 32 is disposed within the first through hole 312 of the end cover 31. The outer wall of the center seat ring 32 contacts the interior of the first through hole 312, and the center seat ring 32 can slide freely relative to the end cover 31. The center seat ring 32 is also fixedly connected to the drive shaft 10 by connecting bolts 33.

[0032] The fact that the center bearing 32 can slide freely relative to the end cover 31 ensures that the drive shaft 10, which is fixedly connected to the center bearing 32, rotates coaxially with the end cover 31, effectively preventing radial offset of the drive shaft 10. Furthermore, the fixed connection between the drive shaft 10 and the center bearing 32 via the connecting bolts 33 reduces the length of the drive shaft 10. This design lowers the manufacturing and processing difficulty of the drive shaft 10 while ensuring smooth transmission.

[0033] This invention limits the axial displacement of the drive shaft relative to the hub and drive shaft sleeve by setting a support bearing and a limiting component connected to the drive shaft and hub. The setting that the central bearing can slide freely relative to the end cover ensures that the drive shaft will not impact the spline on the hub due to radial displacement and generate friction noise when the torque transmission changes abruptly.

[0034] like Figure 1 , 2 As shown, in one embodiment, the central seat ring 32 includes: a seat ring body 322, in which a second through hole 323 is provided in the middle, the seat ring body 322 being sleeved inside the first through hole 312; and a limiting part 321, which is provided on one side of the seat ring body 322, the limiting part 321 abutting against the end cap 31.

[0035] The center race 32 includes a race body 322 whose outer diameter mates with the first through hole 312 and a limiting part 321 fixedly connected to one side of the race body 322. The outer diameter of the limiting part 321 is larger than the inner diameter of the first through hole 312. The race body 322 also has a through second through hole 323 in the middle. During assembly, the race body 322 is inserted into the first through hole 312 from one side of the end cap 31, and the limiting part 321 abuts against one side of the end cap 31. The connecting bolt 33 passes through the second through hole 323 from one side of the limiting part 321 and is fixedly connected to the locking hole 11. The center race 32 is pressed and fixedly connected to the drive shaft 10 by the connecting bolt 33.

[0036] Furthermore, there is a gap of 0.05mm to 0.1mm between the inner diameter of the first through hole 312 and the outer diameter of the seat ring body 322. This arrangement ensures that the center seat ring 32 can slide freely relative to the end cap 31.

[0037] By setting a central bearing ring, this invention ensures that the drive shaft rotates coaxially with the central bearing ring without radial offset.

[0038] like Figure 3As shown, in one embodiment, the thickness of the seat body 322 is greater than the thickness of the end cap 31.

[0039] Because the end cap 31 is fixedly connected to the hub 20 and not to the drive shaft 10, there is relative movement between the drive shaft 10 and the end cap 31 when the transmitted torque changes abruptly. By designing the thickness of the seat ring body 322 to be greater than the thickness of the end cap 31, and with the limiting function of the support bearing 40, the side of the drive shaft 10 does not contact the end cap 31. This prevents abnormal noise from friction between the drive shaft 10 and the end cap 31 when the transmitted torque changes abruptly.

[0040] Furthermore, the thickness of the seat body 322 is 0.5 mm to 2 mm greater than the thickness of the end cap 31.

[0041] This invention sets the thickness of the seat ring body to be greater than the thickness of the end cover, and maintains a safe distance between the drive shaft and the end cover, effectively avoiding the risk of contact between the drive shaft and the end cover, eliminating the problem of abnormal noise caused by contact, and improving the overall stability and reliability of operation.

[0042] like Figure 1 As shown, in one embodiment, it includes: a locking bolt 34; the end cap 31 is provided with a second locking hole 311, and the locking bolt 34 passes through the second locking hole 311 and is connected to the hub 20.

[0043] The end cap 31 is fixedly connected to the wheel hub 20 by locking bolts 34. The end cap 31 is provided with a second locking hole 311; furthermore, there are multiple second locking holes 311, and the wheel hub 20 is also provided with threaded holes corresponding to the second locking holes 311 one by one. The locking bolts 34 pass through the second locking holes 311 from one side of the end cap 31 and are screwed into the threaded holes on the wheel hub 20. The present invention ensures that the end cap and the wheel hub rotate synchronously by fixing the end cap to the wheel hub.

[0044] like Figure 1 As shown, in one embodiment, the connecting bolt 33 includes: a bolt head 331, the outer diameter of which is larger than the inner diameter of the first through hole 312; and a screw 332, one end of which is connected to the bolt head 331, and the other end of which passes through the first through hole 312 and is screwed to the first locking hole 11.

[0045] The connecting bolt 33 includes a screw 332 and a bolt head 331 fixedly connected to one side of the screw 332. The outer diameter of the bolt head 331 is larger than the inner diameter of the first through hole 312. After assembly, the bolt head 331 and the drive shaft 10 are respectively located on both sides of the end cover 31. The bolt head 331 restricts the drive shaft 10 from moving away from the end cover 31 under the stop action of the end cover 31, while the support bearing 40 restricts the drive shaft 10 from moving towards the end cover 31.

[0046] Furthermore, the outer diameter of the drive shaft 10 near the end cover 31 is larger than the inner diameter of the first through hole 312. When the extreme case of the drive shaft 10 contacting the end cover 31 occurs, the end cover 31 will restrict the intermittent offset of the drive shaft 10.

[0047] This invention uses a connecting bolt with a bolt head outer diameter larger than the inner diameter of the first through hole to connect to the drive shaft, thereby limiting the axial displacement of the drive shaft.

[0048] like Figure 1 As shown, in one embodiment, a bearing 60 is included, which is disposed between the hub 20 and the hub 20 via a drive bushing 50.

[0049] The hub 20 is connected to the drive shaft sleeve 50 via a bearing 60, which allows the hub 20 to rotate relative to the outer circumference of the drive shaft sleeve 50, which is fixedly set.

[0050] Furthermore, bearing 60 is a double-row tapered roller bearing or bearing unit. Double-row tapered roller bearings have high load-carrying capacity, capable of simultaneously withstanding large radial loads and bidirectional axial loads, as well as overturning moments, making them particularly suitable for heavy-load and high-impact applications. They also have high rigidity; the double-row structure is more rigid than single-row bearings, effectively limiting hub displacement and ensuring stable operation. The contact line between the rollers and raceways is oblique, better accommodating axial movement and angular deviations during shaft operation, resulting in smoother operation and lower noise. Finally, they exhibit low frictional loss; the optimized roller end face and flange design promotes lubricant film formation, reduces frictional heat and component wear, and helps extend service life.

[0051] like Figure 1 As shown, in one embodiment, the drive shaft 10 and the hub 20 are connected by an involute spline.

[0052] Involute spline connections offer the following advantages: high load-bearing capacity; the involute tooth profile with a large root radius results in low stress concentration, enabling them to withstand larger loads and impacts; multiple teeth can bear loads simultaneously, resulting in more even force distribution and the transmission of greater torque; the well-neutral involute tooth profile provides self-centering, ensuring precise coaxiality between the drive shaft and hub, effectively reducing vibration and noise during high-speed operation and improving transmission stability; easy assembly and disassembly; when using an interference fit, assembly and disassembly can be easily performed using a press or temperature difference method. For dynamic connections (spline pairs can slide axially), the sliding friction between tooth surfaces is low, resulting in less wear; advantages in strength and lifespan; uniform stress distribution on the tooth surface reduces wear, making tooth breakage or tooth surface crushing less likely; the fit clearance can be flexibly adjusted to adapt to different working conditions and extend service life.

[0053] like Figure 1 , 4As shown in Figure 5, this embodiment of the invention also discloses a transmission system, including the connection structure between the drive shaft and the hub. The connection structure between the drive shaft and the hub includes: a drive shaft sleeve 50, which has a through hole inside and a limiting groove 51 at one end; a hub 20, which is rotatably connected to the other end of the drive shaft sleeve 50; a drive shaft 10, which passes through the through hole inside the drive shaft sleeve 50, and a limiting step 12 is provided at the point where the drive shaft 10 mates with the limiting groove 51; a support bearing 40, which is sleeved on the limiting step 12, and the support bearing 40 is also installed in the limiting groove 51; and a limiting component 30, which is connected to the end of the drive shaft 10 away from the limiting step 12 and the hub 20, and the limiting component 30 mates with the support bearing 40 to limit the axial and radial displacement of the drive shaft 10.

[0054] One end of the drive shaft sleeve 50 is provided with a limiting groove 51, and a through hole is provided inside. The drive shaft sleeve 50 is fixedly connected to other structures of the vehicle body. Its main function is to reduce friction and wear of the shaft during movement, and to provide support and guidance. At the same time, with the help of lubricant, it ensures smooth rotation of the drive shaft and extends the service life of the components.

[0055] The hub 20 is rotatably connected to the outer periphery of the drive shaft sleeve 50.

[0056] The drive shaft 10 passes through the through hole of the drive shaft sleeve 50 and can rotate relative to the drive shaft sleeve 50. One end of the drive shaft 10 is connected to the power output end of the vehicle, and the other end is connected to the wheel hub 20. The power output end of the vehicle and the wheel hub 20 are connected and transmitted through the drive shaft 10. A limiting step 12 is also provided on the drive shaft 10 at a position opposite to the limiting groove 51. A support bearing 40 is provided between the limiting groove 51 and the limiting step 12. A third through hole 41 is provided on the support bearing 40, and the inner wall of the third through hole 41 contacts the outer wall of the limiting step 12.

[0057] A limiting assembly 30 is disposed on the side of the drive shaft 10 away from the limiting step 12, and the limiting assembly 30 is connected to both the drive shaft 10 and the wheel hub 20. Further, the limiting assembly 30 includes a connecting bolt 33 fixedly connected to the drive shaft 10 and an end cap 31 fixedly connected to the wheel hub 20. The end cap 31 restricts the connecting bolt 33 to rotate only along its axis.

[0058] During assembly, first install the hub 20 onto the outer periphery of the drive shaft sleeve 50, then sleeve the support bearing 40 onto the limiting step 12, and then pass the drive shaft 10 through the through hole inside the drive shaft sleeve 50 from the side where the limiting groove 51 is provided. Finally, use the limiting assembly 30 to connect the hub 20 to both the drive shaft 10 and the hub 20 on the side of the hub 20 away from the drive shaft sleeve 50.

[0059] After assembly, the hub 20 can rotate relative to the drive shaft sleeve 50 under the drive of the drive shaft 10. Since the limiting component 30 is connected to both the drive shaft 10 and the hub 20, the drive shaft 10 and the hub 20 always rotate in the same direction under the limiting action of the limiting component 30 and the support bearing 40, effectively preventing radial displacement of the drive shaft 10 relative to the hub 20. After the connecting bolt 33 of the limiting component 30 is fixedly connected to the drive shaft 10, the bolt head 331 and the drive shaft 10 are respectively located on both sides of the end cover 31. With the cooperation of the end cover 31, the connecting bolt 33, and the support bearing 40, the drive shaft 10 does not move axially.

[0060] This invention limits the axial and radial offset of the drive shaft relative to the hub and drive shaft sleeve by setting a support bearing and a limiting component connected to the drive shaft and hub. This ensures that when the drive shaft transmits torque suddenly, it will not impact the spline on the hub due to axial and radial offset, thus preventing friction noise.

[0061] In the description of this invention, it should be noted that the terms "upper," "lower," 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 the invention and simplifying the description, and do not 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 the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0062] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0063] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A connection structure between a drive shaft and a wheel hub, characterized in that, include: The drive bushing (50) has a through hole inside and a limiting groove (51) at one end. The hub (20) is rotatably connected to the outer circumference of the other end of the drive shaft sleeve (50); A drive shaft (10) is inserted into the through hole inside the drive shaft sleeve (50), and a limiting step (12) is provided at the mating point between the drive shaft (10) and the limiting groove (51). A support bearing (40) is sleeved on the limiting step (12), and the support bearing (40) is also installed in the limiting groove (51); A limiting component (30) is connected to the end of the drive shaft (10) away from the limiting step (12) and the hub (20). The limiting component (30) cooperates with the support bearing (40) to limit the axial and radial displacement of the drive shaft (10).

2. The connection structure between the drive shaft and the hub according to claim 1, characterized in that: The drive shaft (10) is provided with a first locking hole (11) on the side where it connects with the limiting component (30). The limiting component (30) includes: An end cap (31) has a first through hole (312) in its middle part, and the end cap (31) is fixedly connected to the hub (20); The connecting bolt (33) passes through the first through hole (312) and connects to the first locking hole (11).

3. The connection structure between the drive shaft and the hub according to claim 2, characterized in that, The limiting component (30) further includes: A center seat (32) is fitted between the first through hole (312) and the connecting bolt (33).

4. The connection structure between the drive shaft and the hub according to claim 3, characterized in that, The central seat ring (32) includes: The seat ring body (322) has a through second hole (323) in the middle, and the seat ring body (322) is fitted inside the first through hole (312); A limiting part (321) is provided on one side of the seat body (322), and the limiting part (321) abuts against the end cap (31).

5. The connection structure between the drive shaft and the hub according to claim 4, characterized in that: The thickness of the seat body (322) is greater than the thickness of the end cap (31).

6. The connection structure between the drive shaft and the hub according to claim 2, characterized in that, include: Locking bolt (34); The end cap (31) is provided with a second locking hole (311), and the locking bolt (34) passes through the second locking hole (311) and is connected to the hub (20).

7. The connection structure between the drive shaft and the hub according to claim 2, characterized in that, The connecting bolt (33) includes: The outer diameter of the bolt head (331) is larger than the inner diameter of the first through hole (312); The screw (332) has one end connected to the bolt head (331) and the other end passed through the first through hole (312) and was screwed into the first locking hole (11).

8. The connection structure between the drive shaft and the hub according to claim 1, characterized in that, include: A bearing (60) is disposed between the hub (20) and the hub (20) via a drive bushing (50).

9. The connection structure between the drive shaft and the hub according to claim 1, characterized in that: The drive shaft (10) and the hub (20) are connected by an involute spline.

10. A transmission system, characterized in that, Includes the connection structure between the drive shaft and the hub as described in any one of claims 1-9.

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