A double drive shaft

Abstract

The application relates to the field of transmission technology, in particular to a duplex transmission shaft. The duplex transmission shaft comprises a middle fork assembly, a first fork assembly, a second fork assembly and two transmission assemblies. The first fork assembly and the second fork assembly are located on the opposite sides of the middle fork assembly. Each transmission assembly comprises a four-shaft unit and four rolling units. The four-shaft unit comprises a first shaft module, a second shaft module and a connecting module. The minimum included angle between the axis line of the first shaft module and the axis line of the second shaft module in the projection on a set plane is greater than 0 DEG and smaller than 90 DEG. The two ends of one first shaft module are rotationally connected with one side of the middle fork assembly; the two ends of another first shaft module are rotationally connected with the other side of the middle fork assembly. The two ends of one second shaft module are connected with the first fork assembly; the two ends of another second shaft module are connected with the second fork assembly. The axis lines of the two second shaft modules are oppositely inclined. Thus, the problem that the fork arms at the two ends of the duplex transmission shaft interfere with each other when the included angle between the shafts is too large is solved.

Description

Technical Field

[0001] This invention relates to the field of transmission technology, and more specifically, to a double-drive shaft. Background Technology

[0002] A double driveshaft is a power transmission assembly consisting of two driveshafts connected by two universal joints and connectors. It is mainly used in mechanical systems that require power transmission over long distances or at varying angles, and is primarily used in automotive transmission systems. Especially when the driveshafts need to traverse long distances or when the angle between the two shafts is large, the double universal joints can ensure constant speed transmission of power. It can also be used in other mechanical fields where constant speed transmission at varying angles is required.

[0003] While currently available double-shaft drive shafts can accommodate a certain inter-shaft angle, the maximum permissible angle is usually small. When the inter-shaft angle exceeds the design range, the swing trajectories of the two universal joint fork arms may interfere. When the angle of the universal joint fork arm is too large, the plane of rotation intersects with the motion space of the adjacent fork arm, and the fork arms at both ends may make physical contact when swinging to their limit positions, leading to jamming or breakage. This physical contact caused by excessive shaft angle not only causes jamming in the transmission system, affecting the normal operation of the machinery, but in severe cases, it can also lead to component failures such as universal joint fork arm breakage and cross shaft damage. This not only increases equipment maintenance costs and downtime, but may also cause safety accidents and threaten the personal safety of operators. Summary of the Invention

[0004] To address the problem of interference between the fork arms at both ends of a double drive shaft when the included angle between the shafts is too large, this invention provides a double drive shaft, comprising:

[0005] Mid-fork assembly;

[0006] The first fork assembly is located on one side of the middle fork assembly;

[0007] The second fork assembly is located on the other side of the middle fork assembly;

[0008] Two transmission components are provided, each comprising a four-axis unit and four rolling units. Each four-axis unit includes a first axis module, a second axis module, and a connecting module. The sidewall of the first axis module is connected to the sidewall of the second axis module via the connecting module. Both ends of the first axis module are rotatably connected to one of the rolling units. Both ends of the second axis module are also rotatably connected to one of the rolling units. The minimum angle between the projection of the axis of the first axis module onto a set plane and the projection of the axis of the second axis module onto the set plane is greater than 0° and less than 90°. The set plane is parallel to both the axes of the first and second axis modules.

[0009] One of the first shaft modules has its two ends rotatably connected to one side of the center fork assembly via two rolling units; the other of the first shaft modules has its two ends rotatably connected to the other side of the center fork assembly via two rolling units.

[0010] One of the second shaft modules is connected to the first fork assembly at both ends via two rolling units; the other second shaft module is connected to the second fork assembly at both ends via two rolling units.

[0011] The axes of the two second axis modules are tilted in opposite directions.

[0012] In some embodiments, the minimum included angle α between the projection of the axis of the first axis module onto the set plane and the projection of the axis of the second axis module onto the set plane is greater than 75° and less than 90°.

[0013] In some embodiments, the axis of the first axis module and the axis of the second axis module are spaced apart in the radial direction of the first axis module.

[0014] In some embodiments, D = k × d1; 1 ≤ k ≤ 2; the outer diameter d1 of the first shaft module is the same as the outer diameter d2 of the second shaft module; D is the distance between the axis of the first shaft module and the axis of the second shaft module.

[0015] In some embodiments, the connection module includes a central connection portion, a first side connection portion, and a second side connection portion;

[0016] The central connecting portion is connected to the outer peripheral wall of the first shaft module and the outer peripheral wall of the second shaft module, respectively; the first side connecting portion and the second side connecting portion are connected to the central connecting portion, respectively;

[0017] The first side connection portion is located between the maximum included angle of the first axis module and the second axis module, and the first side connection portion is connected to the first axis module and the second axis module respectively;

[0018] The second side connection is located between the minimum included angle of the first shaft module and the second shaft module, and the second side connection is connected to the first shaft module and the second shaft module respectively.

[0019] In some embodiments, the maximum dimension of the first side connection portion along the radial direction of the middle connection portion is greater than the maximum dimension of the second side connection portion along the radial direction of the middle connection portion.

[0020] In some embodiments, the connecting module includes a through hole; the through hole extends through the first side connecting portion along the spacing direction between the first shaft module and the second shaft module.

[0021] In some embodiments, the first axis module includes a first axis seat, a first left axis, and a first right axis; the second axis module includes a second axis seat, a second left axis, and a second right axis.

[0022] The first bearing and the second bearing are connected by the connecting module; the first left shaft and the first right shaft are respectively connected to the two ends of the first bearing; the second left shaft and the second right shaft are respectively connected to the two ends of the second bearing.

[0023] In some embodiments, the rolling unit includes a rolling sleeve, a rolling element, and a sealing ring; the rolling sleeve is fitted onto both ends of the first shaft module and both ends of the second shaft module; the sealing ring and the rolling element are disposed inside the rolling sleeve, with the rolling element located between the bottom wall of the rolling sleeve and the sealing ring;

[0024] At both ends of the first shaft module and the second shaft module, the rolling element abuts against the outer peripheral wall of the corresponding shaft module and the inner peripheral wall of the rolling sleeve, respectively, and the sealing ring seals between the outer peripheral wall of the corresponding shaft module and the inner peripheral wall of the rolling sleeve.

[0025] In some embodiments, the center fork assembly includes a center fork seat, a center left fork hole, a center right fork hole, a center second left fork hole, and a center second right fork hole;

[0026] The left and right fork holes are located on one side of the center fork seat; the left and right fork holes are arranged opposite to each other; the two ends of a first shaft module are respectively mounted in the left and right fork holes via the rolling unit.

[0027] The left and right forks of the second middle fork are respectively located on the other side of the middle fork seat; the left and right forks of the second middle fork are arranged opposite to each other; the two ends of another first shaft module are respectively mounted on the left and right forks of the second middle fork via the rolling unit;

[0028] The first fork assembly includes a first fork seat, a first left fork hole, and a first right fork hole; the first left fork hole and the first right fork hole are respectively disposed on the first fork seat; the first left fork hole and the first right fork hole are disposed opposite to each other; the two ends of a second shaft module are respectively mounted on the first left fork hole and the first right fork hole via the rolling unit;

[0029] The second fork assembly includes a second fork seat, a second left fork hole, and a second right fork hole; the second left fork hole and the second right fork hole are respectively disposed on the second fork seat; the second left fork hole and the second right fork hole are disposed opposite to each other; the two ends of another second shaft module are respectively mounted on the second left fork hole and the second right fork hole through the rolling unit.

[0030] To solve the problem of interference between the fork arms at both ends of the double drive shaft when the included angle between the shafts is too large, the present invention has the following advantages:

[0031] The axes of the first and second axes are projected onto the set plane at an angle between 0° and 90°, and the axes of the two second axes are tilted in opposite directions. When the swing angle is large, the motion planes of the first fork assembly, the second fork assembly, and the middle fork assembly are misaligned. This misalignment prevents the fork arm motion trajectories from overlapping, thus forming a symmetrical misalignment and completely eliminating the risk of collision at extreme angles.

[0032] Moreover, as a connecting carrier, the middle fork assembly is more rigid than the traditional slender intermediate shaft connecting structure, which can effectively resist lateral thrust, so that the first fork assembly and the second fork assembly can remain stable during operation and avoid interference with other surrounding structures. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of a double drive shaft according to one embodiment;

[0034] Figure 2 for Figure 1 A schematic diagram of the structure of the first fork component and the second fork component;

[0035] Figure 3 for Figure 2 Another structural schematic diagram of the first and second forks in the middle;

[0036] Figure 4 for Figure 1 A structural diagram of the middle connecting module and the middle fork assembly;

[0037] Figure 5 for Figure 4 Another structural diagram of the middle connecting module and the middle fork assembly;

[0038] Figure 6 for Figure 4 Schematic diagram of the structure of the mid-fork assembly;

[0039] Figure 7 for Figure 6 A cross-sectional view of the central fork component;

[0040] Figure 8 for Figure 4 A schematic diagram of the structure of the intermediate connection module;

[0041] Figure 9 for Figure 8 A structural schematic diagram of the middle connection module from another perspective;

[0042] Figure 10 for Figure 8 Another structural diagram of the connecting module;

[0043] Figure 11 This is a schematic diagram of the rolling unit.

[0044] Figure label:

[0045] 10. First fork assembly; 11. First fork holder; 12. First left fork hole; 13. First right fork hole; 20. Middle fork assembly; 21. Middle fork holder; 22. Middle left fork hole (first middle fork); 23. Middle right fork hole (first middle fork); 24. Middle left fork hole (second middle fork); 25. Middle right fork hole (second middle fork); 30. Second fork assembly; 31. Second fork holder; 32. Second left fork hole; 33. Second right fork hole; 40. Transmission assembly; 41. Four-axis unit; 411. First axis module; 411 1. First shaft seat; 4112. First left shaft; 4113. First right shaft; 412. Second shaft module; 4121. Second shaft seat; 4122. Second left shaft; 4123. Second right shaft; 413. Connecting module; 4131. Middle connecting part; 4132. First side connecting part; 4133. Second side connecting part; 4134. Through hole; 42. Rolling unit; 421. Rolling sleeve; 422. Rolling element; 423. Sealing ring. Detailed Implementation

[0046] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0047] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0048] A double driveshaft is a structure used in automotive transmission systems to transmit power, primarily used in vehicles with long wheelbases. A double driveshaft consists of two driveshaft sections connected and fixed to the vehicle frame via two universal joints, forming a combined structure of front drive, intermediate support, and rear drive.

[0049] When the working angle of the double drive shaft exceeds the design limit, it will cause the fork arm angle of the universal joint fork to be too large, and the rotation plane will intersect with the movement space of the adjacent fork arm. The fork arms at both ends may make physical contact when swinging to the limit position, resulting in jamming or breakage.

[0050] Example 1:

[0051] This embodiment proposes a double-drive shaft, such as... Figure 1As shown, it includes a middle fork assembly 20, a first fork assembly 10, a second fork assembly 30, and two drive assemblies 40.

[0052] As a connecting carrier, the middle fork assembly 20 is more rigid than the traditional slender intermediate shaft connecting structure, and can effectively resist lateral thrust, so that the first fork assembly 10 and the second fork assembly 30 can remain stable during operation and avoid interference with other surrounding structures.

[0053] The first fork assembly 10 is located on one side of the middle fork assembly 20 and is used to connect to the drive shaft. The second fork assembly 30 is located on the other side of the middle fork assembly 20 and is used to connect to the driven shaft.

[0054] like Figure 4 and Figure 8 As shown, each transmission assembly 40 includes a four-axis unit 41 and four rolling units 42. The four-axis unit 41 includes a first axis module 411, a second axis module 412, and a connecting module 413. The sidewall of the first axis module 411 is connected to the sidewall of the second axis module 412 via the connecting module 413. Both ends of the first axis module 411 are rotatably connected to one rolling unit 42. Both ends of the second axis module 412 are rotatably connected to one rolling unit 42.

[0055] like Figure 5 As shown, the minimum angle α between the projection of the axis of the first axis module 411 onto the setting plane and the projection of the axis of the second axis module 412 onto the setting plane is greater than 0° and less than 90°. The setting plane is parallel to the axes of the first axis module 411 and the second axis module 412, respectively. This creates an angle between the axes of the first axis module 411 and the second axis module 412, allowing the double drive shaft to adapt to drive shafts with larger inter-axis angles for transmission.

[0056] like Figure 4 As shown, one first shaft module 411 has its two ends rotatably connected to one side of the center fork assembly 20 via two rolling units 42; the other first shaft module 411 has its two ends rotatably connected to the other side of the center fork assembly 20 via two rolling units 42. The two first shaft modules 411 are connected to the center fork assembly 20 via rolling units 42, which, compared to traditional sliding friction, can significantly reduce frictional heat generation and wear during large-angle transmission, and reduce the possibility of jamming.

[0057] One second shaft module 412 is connected to the first fork assembly 10 at both ends via two rolling units 42; the other second shaft module 412 is connected to the second fork assembly 30 at both ends via two rolling units 42. The two second shaft modules 412 are connected to the first fork assembly 10 and the second fork assembly 30 respectively via rolling units 42. Compared to traditional sliding friction, this significantly reduces frictional heat generation and wear during large-angle transmission, and reduces the possibility of jamming.

[0058] The axes of the two second shaft modules 412 are tilted in opposite directions. In this way, even if the angle between the drive shaft and the transmission shaft in the double drive shaft application is too large, the motion planes of the first fork assembly 10, the second fork assembly 30 and the middle fork assembly 20 will be misaligned, so that the motion planes of the two fork arms will not overlap, forming a symmetrical misalignment. The motion trajectories of the fork arms will not overlap, which can completely eliminate the risk of collision at extreme angles.

[0059] Furthermore, such as Figure 5 As shown, the minimum angle α between the projection of the axis of the first axis module 411 onto the set plane and the projection of the axis of the second axis module 412 onto the set plane is greater than 75° and less than 90°. This creates a near-perpendicular spatial misalignment between the motion planes of the first fork assembly 10, the second fork assembly 30, and the middle fork assembly 20. Compared to an angle of 0° to 75°, this further reduces the overlap area of ​​the fork arm's motion trajectory. Combined with the high rigidity structure of the middle fork assembly 20, it effectively disperses the lateral thrust at large angles, reduces the sway amplitude of the first fork assembly 10 and the second fork assembly 30, and avoids interference with surrounding structures due to component vibration. Specifically, the minimum angle α between the projection of the axis of the first axis module 411 onto the set plane and the projection of the axis of the second axis module 412 onto the set plane can be between 75° and 80°, or between 85° and 90°. The specific minimum angle α can be set based on the angle and spacing between the drive shaft and the driven shaft.

[0060] Furthermore, such as Figure 8 As shown, the axis of the first shaft module 411 and the axis of the second shaft module 412 are spaced apart in the radial direction of the first shaft module 411. The radial spacing of the axes of the first shaft module 411 and the second shaft module 412 further increases the physical isolation of their movement space, enabling the dual drive shafts to adapt to the operation of the driving shaft and driven shaft with larger inter-shaft angles. At the same time, it avoids rigid contact when the shaft modules swing at large angles, and the radial load in the transmission process can be dispersed by radial misalignment, reducing local stress concentration in the rolling unit 42.

[0061] Furthermore, such as Figure 9As shown, D = k × d1; 1 ≤ k ≤ 2. The outer diameter d1 of the first shaft module 411 is the same as the outer diameter d2 of the second shaft module 412. D is the distance between the axis of the first shaft module 411 and the axis of the second shaft module 412. By setting the distance D between the first shaft module 411 and the second shaft module 412 to 1-2 times their outer diameter d1, it is possible to ensure that the two shaft modules have sufficient spacing in the radial direction to avoid motion interference, while also preventing the overall size of the transmission assembly 40 from becoming bulky due to excessive spacing. At the same time, the uniform outer diameter specification reduces the processing complexity, and with a reasonable spacing ratio, the radial load can be evenly distributed, ensuring that the rolling unit 42 is subjected to more uniform force, further improving the structural compactness and transmission reliability.

[0062] Furthermore, such as Figure 10 As shown, the connection module 413 includes a middle connection part 4131, a first side connection part 4132, and a second side connection part 4133.

[0063] The intermediate connecting part 4131 is connected to the outer peripheral wall of the first shaft module 411 and the outer peripheral wall of the second shaft module 412, respectively. The intermediate connecting part 4131 directly connects to the outer peripheral walls of the two shaft modules to form a basic load-bearing structure.

[0064] The first side connecting portion 4132 and the second side connecting portion 4133 are respectively connected to the middle connecting portion 4131. The first side connecting portion 4132 is located between the maximum included angle of the first axis module 411 and the second axis module 412, and is connected to both the first axis module 411 and the second axis module 412. The first side connecting portion 4132 is located between the maximum included angle of the two axes, which can resist the separation tendency during large-angle swing.

[0065] The second side connecting portion 4133 is located between the minimum included angle of the first axis module 411 and the second axis module 412, and is connected to both the first axis module 411 and the second axis module 412. The second side connecting portion 4133 enhances the constraint force in the contact direction between the minimum included angles.

[0066] The central connecting part 4131, the first side connecting part 4132, and the second side connecting part 4133 work together to form a stable triangular support, which can improve the torsional and bending resistance of the connecting module 413.

[0067] Furthermore, such as Figure 10 As shown, the maximum radial dimension of the first side connecting portion 4132 along the middle connecting portion 4131 is greater than the maximum radial dimension of the second side connecting portion 4133 along the middle connecting portion 4131.

[0068] The area with the largest included angle is where the relative swing amplitude of the two-axis modules is greatest and the separation tendency is strongest. The first side connecting part 4132 is located in the area of ​​the largest included angle between the two axes. Its larger size can optimize the mass distribution, making the overall mass of the connecting module 413 more evenly distributed circumferentially. This reduces the vibration caused by the center of gravity shift of the connecting module 413 during swing, and can improve the stability of the connecting module 413 during operation. Moreover, the larger size of the first side connecting part 4132 can enhance the structural strength and deformation resistance of this area, effectively resisting tensile and bending stresses at large angles. At the smallest included angle, the stress is relatively mild. The smaller size of the second side connecting part 4133 can reduce material redundancy, reduce the overall weight, and avoid motion interference caused by excessive structural thickness in the compact area of ​​the smallest included angle.

[0069] Furthermore, such as Figure 10 As shown, the connecting module 413 includes a through hole 4134. The through hole 4134 extends through the first side connecting portion 4132 along the spacing direction between the first shaft module 411 and the second shaft module 412.

[0070] The first connecting part 4132 is located between the maximum included angles of the two shaft modules and is larger than the second connecting part 4133. Its mass is relatively concentrated, and uneven mass distribution can easily lead to centrifugal force imbalance during rotation. The through hole 4134 can reduce the mass of the first connecting part 4132 and reduce the overall weight of the connecting module 413. The specific position and diameter of the through hole 4134 can be flexibly adjusted, thereby compensating for the mass distribution deviation caused by the included angle design of the two shafts with minimal weight loss, and further reducing the vibration of the connecting module 413 when swinging. At the same time, the through hole 4134 can reduce redundant material and reduce the overall weight of the connecting module 413.

[0071] Furthermore, the first axis module 411 includes a first axis seat 4111, a first left axis 4112, and a first right axis 4113. The second axis module 412 includes a second axis seat 4121, a second left axis 4122, and a second right axis 4123.

[0072] The first bearing seat 4111 and the second bearing seat 4121 are connected by a connecting module 413. The first left shaft 4112 and the first right shaft 4113 are connected to both ends of the first bearing seat 4111, respectively. The second left shaft 4122 and the second right shaft 4123 are connected to both ends of the second bearing seat 4121, respectively. As the core load-bearing components of the two-axis module, the first bearing seat 4111 and the second bearing seat 4121 form a stable basic connection structure through the connecting module 413, concentrating the force between the two-axis modules and enhancing the overall rigidity. The first left shaft 4112, the first right shaft 4113, the second left shaft 4122, and the second right shaft 4123 extend from both ends of the bearing seat, which can distribute the transmission of torque or load, avoid the concentration of force on a single shaft, and optimize the force transmission path.

[0073] Furthermore, such as Figure 11 As shown, the rolling unit 42 includes a rolling sleeve 421, a rolling element 422, and a sealing ring 423. Rolling sleeves 421 are fitted onto both ends of the first shaft module 411 and both ends of the second shaft module 412. The sealing ring 423 and the rolling element 422 are disposed within the rolling sleeve 421, with the rolling element 422 located between the bottom wall of the rolling sleeve 421 and the sealing ring 423. The rolling element 422 is situated between the outer peripheral wall of the shaft module and the inner peripheral wall of the rolling sleeve 421, replacing sliding friction with rolling friction, significantly reducing the frictional resistance during shaft module rotation, reducing energy loss, and is particularly suitable for high-speed transmission scenarios, improving overall operating efficiency. It is worth noting that the rolling element 422 can be either a ball or a roller.

[0074] At both ends of the first shaft module 411 and the second shaft module 412, the rolling elements 422 abut against the outer peripheral wall of the corresponding shaft module and the inner peripheral wall of the rolling sleeve 421, respectively. A sealing ring 423 seals between the outer peripheral wall of the corresponding shaft module and the inner peripheral wall of the rolling sleeve 421. The sealing ring 423 tightly fits the outer peripheral wall of the shaft module and the inner peripheral wall of the rolling sleeve 421, forming a reliable sealing structure. This effectively prevents external dust, moisture, impurities, etc., from entering the rolling unit 42, while also preventing internal grease leakage. This ensures that the rolling elements 422 are always in a clean and lubricated working environment, reducing wear and corrosion, and significantly extending the service life of the rolling unit 42 and the shaft module.

[0075] Furthermore, such as Figure 6 and Figure 7 As shown, the center fork assembly 20 includes a center fork seat 21, a center left fork hole 22, a center right fork hole 23, a center left fork hole 24, and a center right fork hole 25.

[0076] The left fork hole 22 and the right fork hole 23 are located on one side of the center fork seat 21. The left fork hole 22 and the right fork hole 23 are arranged opposite to each other. The two ends of a first shaft module 411 are respectively mounted on the left fork hole 22 and the right fork hole 23 via rolling units 42.

[0077] The left fork hole 24 and the right fork hole 25 of the middle fork are respectively located on the other side of the middle fork seat 21. The left fork hole 24 and the right fork hole 25 of the middle fork are arranged opposite to each other. The two ends of another first shaft module 411 are respectively installed in the left fork hole 24 and the right fork hole 25 of the middle fork through the rolling unit 42.

[0078] The first shaft module 411 is precisely embedded in the corresponding fork holes at both ends through the rolling unit 42, which can strictly ensure that the axis of the shaft module coincides with the axis of the fork hole, avoid rotational shaking or jamming caused by installation eccentricity, significantly improve the coaxiality and stability of the shaft module when rotating, and is especially suitable for scenarios that require high-precision transmission.

[0079] like Figure 2 and Figure 3As shown, the first fork assembly 10 includes a first fork seat 11, a first left fork hole 12, and a first right fork hole 13. The first left fork hole 12 and the first right fork hole 13 are respectively disposed on the first fork seat 11. The first left fork hole 12 and the first right fork hole 13 are arranged opposite to each other. The two ends of a second shaft module 412 are respectively mounted on the first left fork hole 12 and the first right fork hole 13 via rolling units 42.

[0080] The second fork assembly 30 includes a second fork seat 31, a second left fork hole 32, and a second right fork hole 33. The second left fork hole 32 and the second right fork hole 33 are respectively disposed on the second fork seat 31. The second left fork hole 32 and the second right fork hole 33 are arranged opposite to each other. The two ends of another second shaft module 412 are respectively mounted on the second left fork hole 32 and the second right fork hole 33 via rolling units 42.

[0081] The first fork assembly 10 serves as a direct carrier connecting to the drive shaft. The rotational torque of the drive shaft directly drives the first fork seat 11 to rotate. The rotation of the first fork seat 11 drives the second shaft module 412 to rotate synchronously through the rolling sleeve 421 and the rolling element 422. The power is transmitted to the first shaft module 411 through the second shaft module 412 and the connecting module 413, and then through the middle fork assembly 20 to the first shaft module 411, the connecting module 413, and the second shaft module 412 on the other side, finally reaching the second fork assembly 30. The second fork seat 31 is used to connect to the driven shaft, ultimately transmitting the power to the driven shaft.

[0082] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A double-drive shaft, characterized in that, The double drive shaft includes: Mid-fork assembly; The first fork assembly is located on one side of the middle fork assembly; The second fork assembly is located on the other side of the middle fork assembly; Two transmission components are provided, each comprising a four-axis unit and four rolling units. Each four-axis unit includes a first axis module, a second axis module, and a connecting module. The sidewall of the first axis module is connected to the sidewall of the second axis module via the connecting module. Both ends of the first axis module are rotatably connected to one of the rolling units. Both ends of the second axis module are also rotatably connected to one of the rolling units. The minimum angle between the projection of the axis of the first axis module onto a set plane and the projection of the axis of the second axis module onto the set plane is greater than 0° and less than 90°. The set plane is parallel to both the axes of the first and second axis modules. One of the first shaft modules has its two ends rotatably connected to one side of the center fork assembly via two rolling units; the other of the first shaft modules has its two ends rotatably connected to the other side of the center fork assembly via two rolling units. One of the second shaft modules is connected to the first fork assembly at both ends via two rolling units; the other second shaft module is connected to the second fork assembly at both ends via two rolling units. The axes of the two second axis modules are tilted in opposite directions; The connection module includes a middle connection part, a first side connection part, and a second side connection part; The central connecting portion is connected to the outer peripheral wall of the first shaft module and the outer peripheral wall of the second shaft module, respectively; the first side connecting portion and the second side connecting portion are connected to the central connecting portion, respectively; The first side connection portion is located between the maximum included angle of the first axis module and the second axis module, and the first side connection portion is connected to the first axis module and the second axis module respectively; The second side connection is located between the minimum included angle of the first shaft module and the second shaft module, and the second side connection is connected to the first shaft module and the second shaft module respectively.

2. The double-drive shaft according to claim 1, characterized in that, The minimum included angle α between the projection of the axis of the first axis module onto the set plane and the projection of the axis of the second axis module onto the set plane is greater than 75° and less than 90°.

3. A double-drive shaft according to claim 1, characterized in that, The axis of the first axis module and the axis of the second axis module are spaced apart in the radial direction of the first axis module.

4. A double-drive shaft according to claim 3, characterized in that, D = k × d1; 1 ≤ k ≤ 2; the outer diameter d1 of the first shaft module is the same as the outer diameter d2 of the second shaft module; D is the distance between the axis of the first shaft module and the axis of the second shaft module.

5. A double-drive shaft according to claim 1, characterized in that, The maximum radial dimension of the first side connecting portion along the middle connecting portion is greater than the maximum radial dimension of the second side connecting portion along the middle connecting portion.

6. A double-drive shaft according to claim 5, characterized in that, The connecting module includes a through hole; the through hole extends through the first side connecting portion along the interval direction between the first shaft module and the second shaft module.

7. A double-drive shaft according to claim 1, characterized in that, The first axis module includes a first axis mount, a first left axis, and a first right axis; the second axis module includes a second axis mount, a second left axis, and a second right axis. The first bearing and the second bearing are connected by the connecting module; the first left shaft and the first right shaft are respectively connected to the two ends of the first bearing; the second left shaft and the second right shaft are respectively connected to the two ends of the second bearing.

8. A double-drive shaft according to claim 7, characterized in that, The rolling unit includes a rolling sleeve, a rolling element, and a sealing ring; the rolling sleeve is fitted onto both ends of the first shaft module and both ends of the second shaft module; the sealing ring and the rolling element are disposed inside the rolling sleeve, with the rolling element located between the bottom wall of the rolling sleeve and the sealing ring; At both ends of the first shaft module and the second shaft module, the rolling element abuts against the outer peripheral wall of the corresponding shaft module and the inner peripheral wall of the rolling sleeve, respectively, and the sealing ring seals between the outer peripheral wall of the corresponding shaft module and the inner peripheral wall of the rolling sleeve.

9. A double-drive shaft according to claim 1, characterized in that, The center fork assembly includes a center fork seat, a center left fork hole, a center right fork hole, a center second left fork hole, and a center second right fork hole; The left and right fork holes are located on one side of the center fork seat; the left and right fork holes are arranged opposite to each other; the two ends of a first shaft module are respectively mounted in the left and right fork holes via the rolling unit. The left and right forks of the second middle fork are respectively located on the other side of the middle fork seat; the left and right forks of the second middle fork are arranged opposite to each other; the two ends of another first shaft module are respectively mounted on the left and right forks of the second middle fork via the rolling unit; The first fork assembly includes a first fork seat, a first left fork hole, and a first right fork hole; the first left fork hole and the first right fork hole are respectively disposed on the first fork seat; the first left fork hole and the first right fork hole are disposed opposite to each other; the two ends of a second shaft module are respectively mounted on the first left fork hole and the first right fork hole via the rolling unit; The second fork assembly includes a second fork seat, a second left fork hole, and a second right fork hole; the second left fork hole and the second right fork hole are respectively disposed on the second fork seat; the second left fork hole and the second right fork hole are disposed opposite to each other; the two ends of another second shaft module are respectively mounted on the second left fork hole and the second right fork hole through the rolling unit.

Images