Power transmission structure and gearbox

Abstract

The utility model provides a kind of power transmission structure and gearbox, the power transmission structure includes first pivot and second pivot, the one end of the first pivot is provided with the installation slot for being communicated with outside, the one end of the second pivot is inserted in the installation slot;First bearing is set in the installation slot, the inner ring of the first bearing is sleeved in the one end of the second pivot, the outer ring of the first bearing is connected with the first pivot;Centrifugal impeller is set on the second pivot and is located in the installation slot, to drive the impeller rotation by the second pivot. Through the technical scheme provided by the utility model, the technical problem of insufficient lubrication caused by poor lubrication effect of bearing in the prior art can be solved.

Description

Technical Field

[0001] This utility model relates to the field of power transmission equipment technology, and more specifically, to a power transmission structure and a gearbox. Background Technology

[0002] Currently, in power transmission structures, the input and output shafts are interlocked, and bearings are installed at the joint. Because relative movement occurs between the input shaft and the bearings, lubricating oil needs to be added to the contact points between the bearings and the input shaft to ensure the normal operation of the power transmission structure. In gearboxes with power transmission structures, existing gearbox lubrication methods mainly rely on oil immersion lubrication, that is, the rotation of gears in an oil sump carries lubricating oil to the gear surfaces, and then acts on the bearings through the connection between the input and output shafts.

[0003] However, this lubrication method is ineffective, resulting in insufficient lubrication of the bearing and ultimately bearing failure. Utility Model Content

[0004] The main objective of this invention is to provide a power transmission structure to solve the technical problem of insufficient lubrication caused by poor bearing lubrication in the prior art.

[0005] To achieve the above objectives, a power transmission structure is provided according to one aspect of the present invention, comprising:

[0006] A first rotating shaft and a second rotating shaft, wherein one end of the first rotating shaft is provided with a mounting groove for communicating with the outside world, and one end of the second rotating shaft is inserted into the mounting groove;

[0007] A first bearing is disposed in the mounting groove, the inner ring of the first bearing is sleeved on one end of the second rotating shaft, and the outer ring of the first bearing is connected to the first rotating shaft;

[0008] A centrifugal impeller is mounted on the second rotating shaft and located in the mounting groove, so as to drive the impeller to rotate through the second rotating shaft.

[0009] In some embodiments, the second rotating shaft includes an interconnected shaft end face and an annular surface, and the centrifugal impeller is mounted on the shaft end face;

[0010] The outer edge of the centrifugal impeller is located inside the outer edge of the shaft end face.

[0011] In some embodiments, the rotation axis of the centrifugal impeller is coaxial with the axis of symmetry of the second rotation axis.

[0012] In some embodiments, the centrifugal impeller includes a plurality of centrifugal blades arranged circumferentially around the rotation axis of the centrifugal impeller, two adjacent centrifugal blades forming a first lubricating oil passage, and at least a portion of at least one second lubricating oil passage is provided on the first rotation axis. The at least portion of the second lubricating oil passage extends along the side wall of the first rotation axis that forms the mounting groove and penetrates the side wall of the first rotation axis, so that oil enters the first lubricating oil passage through the second lubricating oil passage.

[0013] In some embodiments, the power transmission structure includes a first gear disposed on the outer periphery of the first rotating shaft, and a portion of the second lubricating oil passage is disposed on the first gear and extends through the inner and outer sides of the first gear along the wall thickness direction.

[0014] In some embodiments, a tooth groove is formed between two adjacent teeth of the first gear, and one end of the second lubricating oil passage is connected to the tooth groove.

[0015] In some embodiments, one end of the second lubricating oil passage is disposed on the end face of the first gear.

[0016] In some embodiments, the second lubricating oil passage is disposed between the two ends of the first gear.

[0017] In some embodiments, there are multiple second lubricating channels; wherein the multiple second lubricating channels are arranged at circumferential intervals along the first gear.

[0018] In some embodiments, the spacing between any two adjacent second lubrication channels in the plurality of second lubrication channels is equal.

[0019] In some embodiments, the bearing is a needle roller bearing or a tile bearing.

[0020] In some embodiments, the first rotating shaft is an input shaft, and the second rotating shaft is an output shaft.

[0021] Another aspect of this utility model provides a gearbox, including the power transmission structure described above, wherein the other end of the first rotating shaft is connected to a power source, and the other end of the second rotating shaft is connected to a load.

[0022] By applying the technical solution of this utility model, a centrifugal impeller is set on the second rotating shaft, and the rotation of the second rotating shaft is used to drive the centrifugal impeller, thereby accelerating the process of lubricating oil entering the mounting groove and being delivered to the first bearing. This can significantly improve the speed and flow rate of lubricating oil reaching the first bearing, ensuring sufficient lubrication of the first bearing and reducing the risk of wear and failure caused by poor lubrication. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0024] Figure 1 A perspective view of a power transmission structure provided according to an embodiment of the present invention is shown;

[0025] Figure 2 A perspective view of the second rotating shaft and centrifugal impeller of the power transmission structure provided according to an embodiment of the present invention is shown;

[0026] Figure 3 A cross-sectional view of the second shaft and centrifugal impeller of the power transmission structure provided according to an embodiment of the present invention is shown;

[0027] Figure 4 A cross-sectional view of the first gear of a power transmission structure provided according to an embodiment of the present invention is shown;

[0028] Figure 5 A cross-sectional view of a power transmission structure provided according to an embodiment of the present invention is shown.

[0029] The above figures include the following reference numerals:

[0030] 1. First rotating shaft; 11. Mounting groove; 12. Second lubrication oil passage;

[0031] 2. Second shaft; 21. First shaft segment; 211. Shaft end face; 212. Circular surface; 22. Second shaft segment;

[0032] 3. First bearing;

[0033] 4. Centrifugal impeller; 41. Centrifugal blades; 42. First lubricating oil passage;

[0034] 5. First gear; 51. Gear tooth; 52. Tooth groove. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] like Figures 1 to 5As shown, an embodiment of this utility model provides a power transmission structure, including a first rotating shaft 1, a second rotating shaft 2, a first bearing 3, and a centrifugal impeller 4. One end of the first rotating shaft 1 is provided with a mounting groove 11 for communicating with the outside world, and one end of the second rotating shaft 2 is inserted into the mounting groove 11. The first bearing 3 is disposed in the mounting groove 11, with its inner ring sleeved on one end of the second rotating shaft 2 and its outer ring connected to the first rotating shaft 1. The centrifugal impeller 4 is disposed on the second rotating shaft 2 and located in the mounting groove 11, so as to drive the impeller to rotate through the second rotating shaft 2.

[0037] By installing a centrifugal impeller 4 on the second shaft 2, and using the rotation of the second shaft 2 to drive the centrifugal impeller 4, the process of lubricating oil entering the mounting groove 11 and being delivered to the first bearing 3 is accelerated. This significantly improves the speed and flow rate of lubricating oil reaching key friction points (such as the first bearing 3), ensuring sufficient lubrication of the first bearing 3 under high-speed or heavy-load conditions and reducing the risk of wear and failure due to poor lubrication. The accelerated flow of lubricating oil not only better lubricates various rotating parts but also effectively removes heat generated by friction, achieving better heat exchange through the flow of lubricating oil, thereby reducing the operating temperature of the components. This is beneficial to improving the stability of the entire power transmission structure and extending its service life. The centrifugal impeller 4 is designed directly at the connection between the first shaft 1 and the second shaft 2, eliminating the need for additional complex lubrication devices, simplifying the overall design, and reducing manufacturing costs and maintenance difficulty. At the same time, due to the improved lubrication and heat dissipation effects, the reliability and safety of the entire transmission structure are enhanced. By reducing dry friction between components, the vibration and noise levels during equipment operation are reduced, improving the NVH (noise, vibration, and harshness) performance of the gearbox.

[0038] Specifically, the second rotating shaft 2 includes an interconnected shaft end face 211 and an annular surface 212, with the centrifugal impeller 4 mounted on the shaft end face 211; wherein the outer edge of the centrifugal impeller 4 is located within the outer edge of the shaft end face 211. Mounting the centrifugal impeller 4 on the shaft end face 211 of the second rotating shaft 2 ensures that the lubricating oil is directly accelerated and guided to the adjacent bearing area, improving the targeting and efficiency of lubrication. It also allows the lubricating oil to quickly reach the first bearing, especially in critical wear-prone areas of the first bearing 3, such as the contact area between the inner and outer rings of the first bearing 3, thereby effectively reducing wear and extending the service life of the first bearing 3. The outer edge of the centrifugal impeller 4 being located within the outer edge of the shaft end face 211 not only makes full use of the space of the shaft end face 211 but also avoids the centrifugal impeller 4 being too large and encroaching on the movement range of other mechanical components, or causing unnecessary aerodynamic resistance, ensuring a balance between the functional realization of the centrifugal impeller 4 and the compact layout of the entire system.

[0039] Furthermore, the rotation axis of the centrifugal impeller 4 is coaxial with the axis of symmetry of the second rotating shaft 2. Maintaining coaxiality between the rotation axis of the centrifugal impeller 4 and the axis of symmetry of the second rotating shaft 2 ensures the balance of the centrifugal impeller 4 during high-speed rotation, avoiding resonance or additional vibration that may be caused by uneven distribution of centrifugal force, thereby reducing noise and vibration during the operation of the overall transmission system and improving NVH performance.

[0040] Furthermore, such as Figure 2 As shown, the centrifugal impeller 4 includes a plurality of centrifugal blades 41 arranged circumferentially around the rotation axis of the centrifugal impeller 4. Two adjacent centrifugal blades 41 form a first lubricating oil passage 42. At least a portion of at least one second lubricating oil passage 12 is provided on the first rotation axis 1. The at least portion of the second lubricating oil passage 12 extends along the side wall of the first rotation axis 1 that forms the mounting groove 11 and penetrates the side wall of the first rotation axis 1, so that oil enters the first lubricating oil passage 42 through the second lubricating oil passage 12. By providing a plurality of centrifugal blades 41 arranged circumferentially around the rotation axis on the centrifugal impeller 4, and forming a first lubricating oil passage 42 between two adjacent centrifugal blades 41, it can be ensured that the lubricating oil is evenly distributed through multiple independent first lubricating oil passages 42 when the centrifugal impeller 4 rotates, thereby increasing the opportunity and area for the lubricating oil to contact the first bearing 3 and improving the lubrication effect. At least one second lubricating oil passage 42 is provided on the first rotating shaft 1, extending along the side wall of the mounting groove 11 and penetrating the side wall of the first rotating shaft 1, so that lubricating oil can be directly guided from the housing or oil sump to the first lubricating oil passage 42 of the centrifugal impeller 4. This design optimizes the lubricating oil introduction path, avoids the problems of long lubricating oil flow path and large pressure loss in traditional lubrication systems, and enables the lubricating oil to reach the parts that need lubrication more quickly, improving lubrication efficiency and response speed. Combining the first lubricating oil passage 42 of the centrifugal impeller 4 with the second lubricating oil passage 12 of the first rotating shaft 1 reduces the need for additional oil guiding components, simplifies the overall design, saves space and cost, and also reduces the complexity of assembly and maintenance. At the same time, due to the pumping effect generated by the rotation of the centrifugal impeller 4, the lubricating oil carried to the tooth surface by the rotation of the first gear 5 and the lubricating oil dripping from the housing wall onto the tooth surface are quickly drawn from the second lubricating oil passage 12 into the mounting groove 11, thereby lubricating the first bearing 3.

[0041] In one embodiment, the power transmission structure includes a first gear 5, which is disposed on the outer periphery of the first rotating shaft 1. A portion of the second lubricating oil passage 12 is disposed on the first gear 5 and extends through both the inner and outer sides of the first gear 5 along the wall thickness direction. Here, the outer side of the first gear 5 refers to one side of the teeth 51 of the first gear 5, and the inner side refers to the side of the first gear 5 that contacts the first rotating shaft 1. By disposing a portion of the second lubricating oil passage 12 on the first gear 5 and extending it through both the inner and outer sides of the first gear 5 along the wall thickness direction, lubricating oil can be directly and efficiently delivered to key components such as the meshing surface of the first gear 5 and the first bearing 3. Integrating the second lubricating oil passage 12 into the first gear 5 makes the layout of the lubrication system more flexible, allowing the position and number of the second lubricating oil passage 12 to be adjusted according to the size, shape, and installation position of different first gears 5. Taking this power transmission structure in a gearbox as an example, this can reduce the viscous torque and churning torque generated during the operation of the first gear 5, reduce power loss, and improve the transmission efficiency of the gearbox. Reduce the resistance of the lubricating oil to the first gear 5 during operation, reduce oil churning loss, and reduce power loss.

[0042] Furthermore, such as Figure 4 As shown, a tooth groove 52 is formed between two adjacent teeth 51 of the first gear 5, and one end of the second lubricating oil passage 12 communicates with the tooth groove 52. The communication between the tooth groove 52 and the second lubricating oil passage 12 allows lubricating oil to be forced into the meshing surface of the teeth 51 during the operation of the first gear 5, thereby increasing the lubrication effect on the teeth 51 and the connecting bearing. The tooth groove 52, as the inlet of the second lubricating oil passage 12, helps to push iron filings or wear products out of the oil passage through the rotation of the first gear 5 itself, rather than allowing them to accumulate, reducing the possibility of blockage and maintaining the flow of lubricating oil, thus ensuring the continuous and efficient operation of the lubrication system. Simultaneously, the use of the centrifugal impeller 4 helps to promote the circulation of lubricating oil in the oil passage, thereby reducing the possibility of impurities such as iron filings clogging the oil passage. This ensures the smooth flow of the lubricating oil passage and avoids lubrication failure and component damage caused by oil passage blockage. For example, the power transmission structure includes a second gear that meshes with the first gear 5. One end of the second lubricating oil passage 12 communicates with the tooth groove 52, so that during the meshing of the first gear 5 and the second gear, lubricating oil can be squeezed onto the meshing surfaces of the first gear 5 and the second gear to allow it to enter the second lubricating oil passage 12 more quickly. Here, the first gear 5 and the second gear are helical gears.

[0043] In another embodiment, one end of the second lubricating oil passage 12 is disposed on the end face of the first gear 5; or, the second lubricating oil passage 12 is disposed between the two ends of the first gear 5. By disposing the port of the second lubricating oil passage 12 on the end face of the first gear 5, the flow direction of the lubricating oil can be precisely controlled, avoiding unnecessary flow waste and over-lubrication. The lubricating oil can flow along a preset optimal path, reducing unnecessary agitation inside the housing and lowering energy loss and noise caused by lubricating oil stirring.

[0044] Furthermore, there are multiple second lubrication channels 12; wherein, the multiple second lubrication channels 12 are arranged at intervals along the circumference of the first gear 5. By uniformly arranging multiple second lubrication channels 12 along the circumference of the first gear 5, it can be ensured that the lubricating oil is evenly distributed across the entire surface of the first gear 5 and on the first bearing 3. The arrangement of multiple second lubrication channels 12 increases the number of lubricating oil inlets, reduces the pressure burden on individual channels, and ensures that even under conditions of high-speed operation or load changes, the lubricating oil can quickly reach the designated lubrication point, enhancing the system's lubrication efficiency and its immediate response to lubrication needs.

[0045] Furthermore, the spacing between any two adjacent second lubrication channels 12 is equal. This equal spacing ensures that each second lubrication channel 12 can undertake similar lubrication tasks, avoiding insufficient lubrication in one area while over-lubrication occurs in another. This helps reduce energy consumption and mechanical wear, and improves the operating efficiency and durability of the entire power transmission structure.

[0046] Furthermore, multiple sets of second lubrication channels 12 can be provided, with each set of second lubrication channels 12 spaced apart along the axial direction of the first gear 5. Providing multiple second lubrication channels 12 increases the number of lubricating oil inlets, reduces the pressure burden on individual channels, and ensures that even under conditions of high-speed operation or load changes, the lubricating oil can quickly reach the designated lubrication point, enhancing the system's lubrication efficiency and its immediate response to lubrication needs.

[0047] Furthermore, the power transmission structure includes a second bearing, with the first bearing 3 and the second bearing spaced apart axially along the second shaft 2. This axial spacing provides stable support at both ends of the shaft, ensuring its axial stability during high-speed rotation or under large torque. This distribution reduces shaft deflection and prevents additional wear caused by axial misalignment, thereby extending the service life of the bearings and shaft.

[0048] Specifically, the second rotating shaft 2 includes a first shaft segment 21 and a second shaft segment 22 connected to each other. The end of the first shaft segment 21 away from the second shaft segment 22 forms the shaft end face 211. The inner ring of the first bearing 3 is fitted onto the first shaft segment 21, and the inner ring of the second bearing is fitted onto the second shaft segment 22. The outer ring of the second bearing is disposed opposite to the first gear 5. The first shaft segment 21 and the second shaft segment 22 each carry their respective bearings, which can reduce interference between different components, simplify the assembly process, and improve assembly quality and efficiency.

[0049] Furthermore, the first bearing 3 and the second bearing are either needle roller bearings or tile bearings. Needle roller bearings have a higher radial load-bearing capacity and a lower coefficient of friction, while tile bearings have a higher radial and axial load-bearing capacity and higher stability at high speeds. Choosing one of these two types as the bearing in the power transmission structure can significantly improve the shaft's load-bearing capacity, reduce friction losses, and thus improve the overall transmission efficiency.

[0050] The first shaft 1 is the input shaft, and the second shaft 2 is the output shaft. The first shaft 1 receives the driving force from an external power source, such as an engine or electric motor. The rotation of the power source is transmitted into the gearbox through the input shaft, initiating the power conversion and transmission process. The second shaft 2 is connected to the load, i.e., the component that needs to be driven, such as wheels or parts of mechanical equipment. After a series of gear changes and torque adjustments within the gearbox, the output shaft finally transmits the power to the load, driving its operation.

[0051] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0052] By installing a centrifugal impeller 4 on the second shaft 2, and using the rotation of the second shaft 2 to drive the centrifugal impeller 4, the process of lubricating oil entering the mounting groove 11 and being delivered to the first bearing 3 is accelerated. This significantly improves the speed and flow rate of lubricating oil reaching key friction points (such as the first bearing 3), ensuring sufficient lubrication of the first bearing 3 under high-speed or heavy-load conditions and reducing the risk of wear and failure due to poor lubrication. The accelerated flow of lubricating oil not only better lubricates various rotating parts but also effectively removes heat generated by friction, achieving better heat exchange through the flow of lubricating oil, thereby reducing the operating temperature of the components. This is beneficial to improving the stability of the entire power transmission structure and extending its service life. The centrifugal impeller 4 is designed directly at the connection between the first shaft 1 and the second shaft 2, eliminating the need for additional complex lubrication devices, simplifying the overall design, and reducing manufacturing costs and maintenance difficulty. At the same time, due to the improved lubrication and heat dissipation effects, the reliability and safety of the entire transmission structure are enhanced. By reducing dry friction between components, the vibration and noise levels during equipment operation are reduced, improving the NVH (noise, vibration, and harshness) performance of the gearbox.

[0053] This application also provides a gearbox, including the power transmission structure described above, wherein the other end of the first rotating shaft 1 is connected to a power source, and the other end of the second rotating shaft 2 is connected to a load.

[0054] For example, the gearbox here refers to a heavy-duty, high-speed automotive gearbox.

[0055] The following explanation of the lubrication process of lubricating oil will be based on an example of a gearbox with the aforementioned power transmission structure:

[0056] In operation, the second shaft 2 remains rotating, and the centrifugal impeller 4 rotates along with the second shaft 2. The lubricating oil enters the first lubricating oil channel 42 in the mounting groove 11 through the second lubricating oil channel 12. During the rotation of the second shaft 2, the centrifugal impeller 4 centrifuges and accelerates the lubricating oil in the first lubricating oil channel 42. At the same time, due to the pumping effect formed by the rotation of the centrifugal impeller 4, the lubricating oil carried to the tooth surface by the rotation of the first gear 5 and the lubricating oil dripping from the box wall onto the tooth surface are quickly drawn from the second lubricating oil channel 12 into the mounting groove 11, thereby lubricating the first bearing 3. Subsequently, the lubricating oil flows back into the gearbox housing from the connection between the first shaft 1 and the second shaft 2.

[0057] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0058] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0059] In the description of this application, it should be understood that the orientation or state relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or state relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0060] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial relationship between a device or feature as shown in the figures and other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0061] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0062] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A power transmission structure, characterized in that, include: The first rotating shaft (1) and the second rotating shaft (2) are provided with a mounting groove (11) for communicating with the outside world at one end of the first rotating shaft (1), and the second rotating shaft (2) is inserted into the mounting groove (11) at one end. The first bearing (3) is disposed in the mounting groove (11), the inner ring of the first bearing (3) is sleeved on one end of the second rotating shaft (2), and the outer ring of the first bearing (3) is connected to the first rotating shaft (1). Centrifugal impeller (4) is mounted on the second rotating shaft (2) and located in the mounting groove (11) so as to drive the impeller to rotate through the second rotating shaft (2).

2. The power transmission structure according to claim 1, characterized in that, The second rotating shaft (2) includes a shaft end face (211) and an annular surface (212) connected to each other, and the centrifugal impeller (4) is mounted on the shaft end face (211); Wherein, the outer edge of the centrifugal impeller (4) is located within the outer edge of the shaft end face (211); and / or, The rotation axis of the centrifugal impeller (4) is coaxial with the axis of symmetry of the second rotation axis (2).

3. The power transmission structure according to claim 2, characterized in that, The centrifugal impeller (4) includes a plurality of centrifugal blades (41) arranged circumferentially around the rotation axis of the centrifugal impeller (4). Two adjacent centrifugal blades (41) form a first lubricating oil passage (42). At least a portion of at least one second lubricating oil passage (12) is provided on the first rotating shaft (1). The at least portion of the second lubricating oil passage (12) extends along the side wall of the first rotating shaft (1) that forms the mounting groove (11) and penetrates the side wall of the first rotating shaft (1) so that oil enters the first lubricating oil passage (42) through the second lubricating oil passage (12).

4. The power transmission structure according to claim 3, characterized in that, The power transmission structure includes a first gear (5), which is disposed on the outer periphery of the first rotating shaft (1). A portion of the second lubricating oil passage (12) is disposed on the first gear (5) and extends through the inner and outer sides of the first gear (5) along the wall thickness direction.

5. The power transmission structure according to claim 4, characterized in that, A tooth groove (52) is formed between two adjacent teeth (51) of the first gear (5), and one end of the second lubricating oil passage (12) is connected to the tooth groove (52).

6. The power transmission structure according to claim 4, characterized in that, One end of the second lubrication channel (12) is disposed on the end face of the first gear (5); or, The second lubrication channel (12) is located between the two ends of the first gear (5).

7. The power transmission structure according to claim 4, characterized in that, There are multiple second lubricating oil passages (12), and the multiple second lubricating oil passages (12) are arranged at intervals along the circumference of the first gear (5).

8. The power transmission structure according to claim 7, characterized in that, The spacing between any two adjacent second lubrication channels (12) in the plurality of second lubrication channels (12) is equal.

9. The power transmission structure according to claim 1, characterized in that, The bearing is a needle roller bearing or a tile bearing; and / or, The first rotating shaft (1) is the input shaft, and the second rotating shaft (2) is the output shaft.

10. A gearbox, characterized in that, The power transmission structure includes any one of claims 1-9, wherein the other end of the first rotating shaft (1) is connected to a power source, and the other end of the second rotating shaft (2) is connected to a load.

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