Gearbox structure and loader
By distributing the oil supply channels within the main housing through the oil distribution cap, shaft, and second gear shaft, the problem of complex internal oil passage design in the loader gearbox main housing is solved, achieving the effects of structural simplification and ease of maintenance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-16
- Publication Date
- 2026-03-10
AI Technical Summary
The complex design of the internal oil passages in the main housing of the loader gearbox results in high production costs, complex structure, and inconvenient inspection and maintenance.
The internal oil supply channels are distributed by a first oil distribution cap, a second oil distribution cap, a first gear shaft, and a second gear shaft, reducing the number of oil channels in the main casing and reducing the number of external oil pipes and joints by utilizing the internal oil channels, thus simplifying the structure.
The simplified gearbox structure reduces design and production costs, facilitates inspection and maintenance, reduces the use of external oil pipes and joints, and lowers maintenance difficulty.
Smart Images
Figure CN223984783U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to engineering machinery technical field especially, relates to a gearbox structure and loader. BACKGROUND
[0002] The electric wheel type loader as the current commonly used engineering machinery is often used in road construction, mine exploitation, farmland water conservancy and other engineering projects because of having good mobility and convenience. The most core component of the electric wheel type loader is a high-speed electric drive gearbox, which is mainly driven by a motor. The motor has the functions of power transmission improvement, speed regulation and torque amplification, and can maintain high-speed operation for a long time with reliable performance.
[0003] In the related art, the gearbox main shell of the loader is internally provided with many oil channels for realizing forced lubrication, gear shifting and the like. The reasonable provision of the internal oil channels of the main shell needs to consider the overall strength, space, thickness and other parameters of the main shell for corresponding setting, and the design and production process cost is high. Moreover, the large number of internal oil channels of the main shell also makes the overall structure of the main shell more complex, increasing the difficulty of maintenance. If external pipelines are provided by avoiding the internal oil channels, the external space will be occupied, and external parts such as pipe joints need to be configured, which is high in cost and complex in assembly process. Moreover, the oil pipe maintenance needs to be disassembled, which is inconvenient to operate due to the limited external space and other reasons, and is inconvenient to disassemble and assemble. UTILITARIAN CONTENT
[0004] The utility model aims at providing a gearbox structure, which is simple in structure, simplifies the internal structure of the gearbox main shell and is convenient for production and maintenance.
[0005] To achieve this purpose, the utility model adopts the following technical solutions:
[0006] A gearbox structure, comprising a main shell, a first oil distribution cover, a second oil distribution cover, a gear shift control valve, a first gear shaft and a second gear shaft, wherein,
[0007] The main shell has a first gear piston cavity and a second gear piston cavity;
[0008] The first oil distribution cover and the second oil distribution cover are fixed on the main shell, the first oil distribution cover has a first oil delivery channel, and the second oil distribution cover has a second oil delivery channel;
[0009] The gear shift control valve is provided on the main shell and has a first oil channel and a second oil channel connected to an oil tank, the first oil channel is connected to a first end of the first oil delivery channel, the second oil channel is connected to a first end of the second oil delivery channel, and the gear shift control valve is used to open the first oil channel at a first gear position or to open the second oil channel at a second gear position;
[0010] The first gear shaft and the second gear shaft are arranged in the main shell, the first gear shaft is provided with a first gear shift oil passage, the first end of the first gear shift oil passage is communicated with the second end of the first oil passage, and the second end of the first gear shift oil passage is communicated with the first gear piston cavity.
[0011] The first oil distribution cover and the main shell jointly form a first cavity, the first end of the first gear shaft extends into the first cavity, and the second end of the first oil passage extends to the inner cavity wall of the first cavity.
[0012] The second oil distribution cover and the main shell jointly form a second cavity, the first end of the second gear shaft extends into the second cavity, and the second end of the second oil passage extends to the inner cavity wall of the second cavity.
[0013] The first end of the first gear shaft is provided with a first oil inlet, the first oil inlet is located in the first cavity, the first oil inlet is communicated with the first end of the first gear shift oil passage, and the first oil passage is communicated with the first gear shift oil passage through the first oil inlet.
[0014] The first end of the second gear shaft is provided with a second oil inlet, the second oil inlet is located in the second cavity, the second oil inlet is communicated with the first end of the second gear shift oil passage, and the second oil passage is communicated with the second gear shift oil passage through the second oil inlet.
[0015] The first end of the first gear shaft is provided with a first oil inlet, the first oil inlet is located in the first cavity, the first oil inlet is communicated with the first end of the first gear shift oil passage, and the first oil passage is communicated with the first gear shift oil passage through the first oil inlet.
[0016] The first end of the first gear shaft is provided with a first oil inlet, the first oil inlet is located in the first cavity, the first oil inlet is communicated with the first end of the first gear shift oil passage, and the first oil passage is communicated with the first gear shift oil passage through the first oil inlet.
[0017] The second end of the first gear shaft is provided with a first oil outlet, the first oil outlet is communicated with the second end of the first gear shift oil passage, and the first gear shift oil passage is communicated with the first gear piston cavity through the first oil outlet.
[0018] The second end of the second gear shaft is provided with a second oil outlet, the second oil outlet is communicated with the second end of the second gear shift oil passage, and the second gear shift oil passage is communicated with the second gear piston cavity through the second oil outlet.
[0019] Preferably, the main shell has a first connecting oil passage and a second connecting oil passage, the first end of the first connecting oil passage is connected to the first oil passage, the second end of the first connecting oil passage is connected to the first end of the first oil conveying passage, the first end of the second connecting oil passage is connected to the second oil passage, and the second end of the second connecting oil passage is connected to the first end of the second oil conveying passage.
[0020] Preferably, the first oil passage, the first connecting oil passage, and the first shifting oil passage are arranged sequentially from top to bottom, and the second oil passage, the second connecting oil passage, and the second shifting oil passage are arranged sequentially from top to bottom.
[0021] Preferably, the first shift oil passage is opened along the axial direction of the first gear shaft, and the second shift oil passage is opened along the axial direction of the second gear shaft.
[0022] This utility model also provides a loader, including the above-mentioned gearbox structure, which effectively simplifies the overall structure of the gearbox and facilitates the inspection and maintenance of the whole machine.
[0023] A loader, characterized in that it includes the gearbox structure described in any one of the above claims, and further includes a chassis, wherein the main housing is fixed to the chassis.
[0024] Beneficial effects:
[0025] The gearbox structure provided by this utility model, when shifting to the first gear, activates the transmission control valve to open the first oil passage, allowing oil from the tank to sequentially flow through the first oil passage, the first oil supply passage, and the first shift oil passage into the first gear piston chamber, thereby pushing the piston inside the first gear piston chamber to shift to the first gear. When shifting to the second gear, the transmission control valve activates to open the second oil passage, allowing oil from the tank to sequentially flow through the second oil passage, the second oil supply passage, and the second shift oil passage into the second gear piston chamber, thereby pushing the piston inside the second gear piston chamber to shift to the second gear. This gearbox structure utilizes the first and second oil distribution caps, the first gear shaft, and the second gear shaft to share the internal oil supply passages, reducing the number of oil passages separately located within the main housing, simplifying the internal structure of the main housing, reducing design and production costs, and facilitating maintenance. Furthermore, fully utilizing the internal oil passages also reduces the use of external oil pipes and connectors, further simplifying the structure, reducing costs, and facilitating maintenance.
[0026] The loader provided by this utility model includes the above-mentioned gearbox structure, which reduces the number of oil passages separately opened in the main housing, effectively simplifies the overall structure of the gearbox, and facilitates the inspection and maintenance of the whole machine. Attached Figure Description
[0027] Figure 1This is a schematic diagram of the gearbox structure provided by this utility model from one perspective;
[0028] Figure 2 This is a schematic diagram of the gearbox structure provided by this utility model from another perspective;
[0029] Figure 3 This utility model is based on Figure 1 Sectional view at point A in the middle;
[0030] Figure 4 This utility model is based on Figure 1 Sectional view at point B;
[0031] Figure 5 This utility model is based on Figure 2 Sectional view at point C;
[0032] Figure 6 This utility model is based on Figure 2 Sectional view at point D.
[0033] In the picture:
[0034] 1. Main casing; 11. First connecting oil passage; 111. First branch passage; 112. Second branch passage; 113. Third branch passage; 114. Fourth branch passage; 115. Fifth branch passage; 12. Second connecting oil passage; 121. Sixth branch passage; 122. Seventh branch passage;
[0035] 2. First oil distribution cap; 201. First chamber; 21. First oil delivery passage;
[0036] 3. Second oil distribution cap; 301. Second chamber; 31. Second oil delivery passage;
[0037] 4. Speed control valve; 41. First oil passage; 42. Second oil passage;
[0038] 5. First gear shaft; 51. First shift oil passage; 52. First oil inlet; 53. First oil outlet; 54. First sealing ring;
[0039] 6. Second gear shaft; 61. Second shift oil passage; 62. Second oil inlet; 63. Second oil outlet; 64. Second sealing ring. Detailed Implementation
[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection 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 of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0043] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0044] This embodiment provides a gearbox structure. (Refer to...) Figures 1 to 6As shown, the gearbox structure includes a main housing 1, a first oil filler cap 2, a second oil filler cap 3, a transmission control valve 4, a first gear shaft 5, and a second gear shaft 6. The main housing 1 has a first gear piston chamber (not shown) and a second gear piston chamber (not shown). The first oil filler cap 2 and the second oil filler cap 3 are fixed to the main housing 1. The first oil filler cap 2 has a first oil passage 21, and the second oil filler cap 3 has a second oil passage 31. The transmission control valve 4 is located on the main housing 1 and has a first oil passage 41 and a second oil passage 42 connected to the oil tank. The first oil passage 41 connects to the first end of the first oil passage 21, and the second oil passage 42 connects to the first end of the second oil passage 31. The transmission control valve 4 is used to open the first oil passage 41 in the first gear position or to open the second oil passage 42 in the second gear position. The first gear shaft 5 and the second gear shaft 6 are rotatably disposed within the main housing 1. The first gear shaft 5 has a first shift oil passage 51. The first end of the first shift oil passage 51 can be connected to the second end of the first oil supply passage 21. The second end of the first shift oil passage 51 can be connected to the first gear piston chamber. The second gear shaft 6 has a second shift oil passage 61. The first end of the second shift oil passage 61 can be connected to the second end of the second oil supply passage 31. The second end of the second shift oil passage 61 can be connected to the second gear piston chamber.
[0045] In this embodiment, when shifting to the first gear, the transmission control valve 4 operates to open the first oil passage 41, allowing oil in the tank to sequentially enter the first gear piston chamber via the first oil passage 41, the first oil supply passage 21, and the first shift oil passage 51, thereby pushing the piston inside the first gear piston chamber to move and shift to the first gear. When shifting to the second gear, the transmission control valve 4 operates to open the second oil passage 42, allowing oil in the tank to sequentially enter the second gear piston chamber via the second oil passage 42, the second oil supply passage 31, and the second shift oil passage 61, thereby pushing the piston inside the second gear piston chamber to move and shift to the second gear. This transmission structure uses the first oil distribution cap 2, the second oil distribution cap 3, the first gear shaft 5, and the second gear shaft 6 to share the internal oil supply passages, reducing the number of oil passages separately opened in the main housing 1, simplifying the internal structure of the main housing 1, reducing design and production costs, and making maintenance easier. In addition, making full use of internal oil passages reduces the use of external oil pipes and joints, further simplifying the structure, reducing costs, and facilitating maintenance.
[0046] In this embodiment, the first oil distribution cap 2, the second oil distribution cap 3, and the transmission control valve 4 can be fixed to the main housing 1 by bolts and other components, which is convenient for connection and easy for maintenance and replacement.
[0047] It should be noted that the on / off control of the first oil passage 41 and the second oil passage 42 by the speed control valve 4 is existing technology.
[0048] In this embodiment, the first oil distribution cap 2 and the main housing 1 together form a first cavity 201. The first end of the first stop shaft 5 extends into the first cavity 201, and the second end of the first oil delivery channel 21 extends to the inner wall of the first cavity 201. The second oil distribution cap 3 and the main housing 1 together form a second cavity 301. The first end of the second stop shaft 6 extends into the second cavity 301, and the second end of the second oil delivery channel 31 extends to the inner wall of the second cavity 301. Specifically, the first ends of the first stop shaft 5 and the second stop shaft 6 both extend out of the main housing 1. The first oil distribution cap 2 covers the first end of the first stop shaft 5, which extends into the first cavity 201. The second oil distribution cap 3 covers the first end of the second stop shaft 6, which extends into the second cavity 301.
[0049] Specifically, the first gear shaft 5 and the inner wall of the first cavity 201 are fitted with a clearance fit, and the second gear shaft 6 and the inner wall of the second cavity 301 are fitted with a clearance fit. This arrangement avoids excessive friction between the first gear shaft 5 and the first cavity 201 during high-speed rotation, and avoids excessive friction between the second gear shaft 6 and the second cavity 301 during high-speed rotation, ensuring reliable rotation of the first gear shaft 5 and the second gear shaft 6.
[0050] Furthermore, the first gear shaft 5 is provided with a first sealing ring 54 on both sides opposite to the first oil inlet 52. The first sealing ring 54 is used to seal the gap between the first gear shaft 5 and the inner wall of the first cavity 201. The second gear shaft 6 is provided with a second sealing ring 64 on both sides opposite to the second oil inlet 62. The second sealing ring 64 is used to seal the gap between the second gear shaft 6 and the inner wall of the second cavity 301. Specifically, the first sealing ring 54 is distributed on both sides opposite to the first oil inlet 52 along the axial direction of the first gear shaft 5, and the second sealing ring 64 is distributed on both sides opposite to the second oil inlet 62 along the axial direction of the second gear shaft 6. The first sealing ring 54 is used to seal both sides of the first oil inlet 52, ensuring that the oil can effectively enter the first shift oil passage 51 through the first oil inlet 52, and preventing the oil from flowing away from both sides of the first oil inlet 52. The second sealing ring 64 is used to block both sides of the second oil inlet 62, ensuring that the oil can effectively enter the second shift oil passage 61 through the second oil inlet 62, and preventing the oil from flowing away from both sides of the second oil inlet 62.
[0051] Optionally, both the first sealing ring 54 and the second sealing ring 64 are rubber sealing rings.
[0052] Optionally, a first receiving groove corresponding to the first sealing ring 54 is provided on the first retaining shaft 5, and the first sealing ring 54 is sleeved on the first receiving groove to ensure reliable and effective installation and positioning of the second sealing ring 64.
[0053] Optionally, a second receiving groove corresponding to the second sealing ring 64 is provided on the second shaft 6, and the second sealing ring 64 is sleeved on the second receiving groove to ensure reliable and effective installation and positioning of the second sealing ring 64.
[0054] Furthermore, the second end of the first gear shaft 5 has a first oil outlet 53, which connects to the second end of the first shift oil passage 51. The first shift oil passage 51 connects to the first gear piston chamber through the first oil outlet 53. The second end of the second gear shaft 6 has a second oil outlet 63, which connects to the second end of the second shift oil passage 61. The second shift oil passage 61 connects to the second gear piston chamber through the second oil outlet 63. Specifically, when shifting to the first gear, the oil in the tank can sequentially enter the first gear piston chamber through the first oil passage 41, the first oil supply passage 21, the first oil inlet 52, the first shift oil passage 51, and the first oil outlet 53; when shifting to the second gear, the oil in the tank can sequentially enter the second gear piston chamber through the second oil passage 42, the second oil supply passage 31, the second oil inlet 62, the second shift oil passage 61, and the second oil outlet 63.
[0055] Furthermore, the main casing 1 is provided with a first connecting oil passage 11 and a second connecting oil passage 12. The first end of the first connecting oil passage 11 is connected to the first oil passage 41, and the second end of the first connecting oil passage 11 is connected to the first end of the first oil delivery passage 21. The first end of the second connecting oil passage 12 is connected to the second oil passage 42, and the second end of the second connecting oil passage 12 is connected to the first end of the second oil delivery passage 31. See details below. Figures 5 to 6 As shown, the first connecting oil passage 11 includes a first branch section 111, a second branch section 112, a third branch section 113, a fourth branch section 114, and a fifth branch section 115 connected in sequence. The first connecting oil passage 11 also includes a sixth branch section 121 and a seventh branch section 122 connected in sequence. When switching to the first gear, the oil in the tank can enter the first gear piston chamber through the first oil passage 41, the first branch section 111, the second branch section 112, the third branch section 113, the fourth branch section 114, the fifth branch section 115, the first oil supply passage 21, the first oil inlet 52, the first shifting oil passage 51, and the first oil outlet 53 in sequence. When shifting to the second gear, the oil in the tank can sequentially enter the second gear piston chamber through the second oil passage 42, the sixth branch passage 121, the seventh branch passage 122, the second oil supply passage 31, the second oil inlet 62, the second shift oil passage 61, and the second oil outlet 63.
[0056] It is worth mentioning that although the main housing 1 also has a shift oil passage in this embodiment, in addition to the oil passage in the main housing 1, the first oil distribution cap 2, the second oil distribution cap 3, the first gear shaft 5, and the second gear shaft 6 also participate in the opening of the shift oil passage. The main housing 1, the first oil distribution cap 2, the second oil distribution cap 3, the first gear shaft 5, and the second gear shaft 6 together form a complete shift oil passage. The main housing 1, the first oil distribution cap 2, the second oil distribution cap 3, the first gear shaft 5, and the second gear shaft 6 share all the oil passages, reducing the number of oil passages opened separately in the main housing 1, simplifying the internal structure of the main housing 1, reducing design and production costs, and making maintenance easier.
[0057] Furthermore, the first oil passage 41, the first connecting oil passage 11, and the first shifting oil passage 51 are arranged sequentially from top to bottom, and the second oil passage 42, the second connecting oil passage 12, and the second shifting oil passage 61 are arranged sequentially from top to bottom. This arrangement allows the oil to flow sequentially through the first oil passage 41, the first connecting oil passage 11, and the first shifting oil passage 51 under its own gravity into the first gear piston chamber, and the oil can also flow sequentially through the second oil passage 42, the second connecting oil passage 12, and the second shifting oil passage 61 under its own gravity into the second gear piston chamber. Of course, the above-mentioned oil flow can also be achieved by using a driving component such as an oil pump to achieve directional oil flow.
[0058] In this embodiment, the first shift oil passage 51 is opened along the axial direction of the first shift shaft 5, and the second shift oil passage 61 is opened along the axial direction of the second shift shaft 6. The structure is simple, easy to process, and ensures reliable flow of oil in the first shift oil passage 51 and the second shift oil passage 61.
[0059] This embodiment also provides a loader. The loader includes the aforementioned gearbox structure and a chassis, with the main housing 1 fixed to the chassis. Applying the aforementioned gearbox structure to the loader has all the beneficial effects of the aforementioned gearbox structure, namely, reducing the number of oil passages separately opened in the main housing 1, simplifying the internal structure of the main housing 1, reducing design and production costs, making full use of the internal oil passages and reducing the use of external oil pipes and joints, further simplifying the structure, reducing costs, and facilitating maintenance. In addition, for the loader as a whole, it effectively simplifies the overall structure of the gearbox, facilitating the inspection and maintenance of the entire machine.
[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A gearbox structure, characterized by, The transmission comprises a main housing (1), a first oil distribution cover (2), a second oil distribution cover (3), a shift control valve (4), a first shift shaft (5) and a second shift shaft (6), wherein, The main housing (1) has a first shift piston cavity and a second shift piston cavity; The first oil distribution cover (2) and the second oil distribution cover (3) are fixed on the main housing (1), the first oil distribution cover (2) has a first oil channel (21), and the second oil distribution cover (3) has a second oil channel (31); The shift control valve (4) is arranged on the main housing (1) and has a first oil passage (41) and a second oil passage (42) connected to an oil tank, the first oil passage (41) is connected to a first end of the first oil channel (21), the second oil passage (42) is connected to a first end of the second oil channel (31), and the shift control valve (4) is used for opening the first oil passage (41) in the first gear position or opening the second oil passage (42) in the second gear position; The first shift shaft (5) and the second shift shaft (6) are rotatably arranged in the main housing (1), the first shift shaft (5) is provided with a first shift oil channel (51), a first end of the first shift oil channel (51) is capable of being communicated with a second end of the first oil channel (21), and a second end of the first shift oil channel (51) is capable of being communicated with the first shift piston cavity, the second shift shaft (6) is provided with a second shift oil channel (61), a first end of the second shift oil channel (61) is capable of being communicated with a second end of the second oil channel (31), and a second end of the second shift oil channel (61) is capable of being communicated with the second shift piston cavity.
2. The gearbox structure according to claim 1, characterized in that, The first oil distribution cover (2) and the main housing (1) jointly form a first cavity (201), a first end of the first shift shaft (5) extends into the first cavity (201), and a second end of the first oil channel (21) extends to an inner cavity wall of the first cavity (201); The second oil distribution cover (3) and the main housing (1) jointly form a second cavity (301), a first end of the second shift shaft (6) extends into the second cavity (301), and a second end of the second oil channel (31) extends to an inner cavity wall of the second cavity (301).
3. The gearbox structure according to claim 2, characterized in that, A first oil inlet (52) is arranged at the first end of the first shift shaft (5), the first oil inlet (52) is located in the first cavity (201), the first oil inlet (52) is communicated with the first end of the first shift oil channel (51), and the first oil channel (21) is communicated with the first shift oil channel (51) through the first oil inlet (52); A second oil inlet (62) is arranged at the first end of the second shift shaft (6), the second oil inlet (62) is located in the second cavity (301), the second oil inlet (62) is communicated with the first end of the second shift oil channel (61), and the second oil channel (31) is communicated with the second shift oil channel (61) through the second oil inlet (62).
4. The gearbox structure according to claim 2, characterized in that, The first shift shaft (5) and the inner cavity wall of the first cavity (201) are in clearance fit, and the second shift shaft (6) and the inner cavity wall of the second cavity (301) are in clearance fit.
5. The gearbox structure according to claim 3, characterized in that, The first seal ring (54) is arranged on the opposite sides of the first oil inlet (52) of the first gear shaft (5), and is used for sealing the gap between the first gear shaft (5) and the inner cavity wall of the first cavity (201).
6. The gearbox structure according to claim 1, characterized by The second end of the first gear shaft (5) is provided with a first oil outlet (53), the first oil outlet (53) is communicated with the second end of the first gear shifting oil channel (51), and the first gear shifting oil channel (51) is communicated with the first gear piston cavity through the first oil outlet (53). The second end of the second gear shaft (6) is provided with a second oil outlet (63), the second oil outlet (63) is communicated with the second end of the second gear shifting oil channel (61), and the second gear shifting oil channel (61) is communicated with the second gear piston cavity through the second oil outlet (63).
7. The gearbox structure according to claim 1, characterized by The main shell (1) is provided with a first communication oil channel (11) and a second communication oil channel (12), the first end of the first communication oil channel (11) is communicated with the first oil channel (41), the second end of the first communication oil channel (11) is communicated with the first end of the first oil delivery channel (21), the first end of the second communication oil channel (12) is communicated with the second oil channel (42), and the second end of the second communication oil channel (12) is communicated with the first end of the second oil delivery channel (31).
8. The gearbox structure according to claim 7, characterized in that, The first oil channel (41), the first communication oil channel (11) and the first gear shifting oil channel (51) are sequentially arranged from top to bottom, and the second oil channel (42), the second communication oil channel (12) and the second gear shifting oil channel (61) are sequentially arranged from top to bottom.
9. The transmission structure according to claim 1, characterized by The first gear shifting oil channel (51) is arranged along the axial direction of the first gear shaft (5), and the second gear shifting oil channel (61) is arranged along the axial direction of the second gear shaft (6).
10. A loader characterized by The gearbox structure comprises the gearbox structure according to any one of claims 1-9, and further comprises a chassis, and the main shell (1) is fixed on the chassis. The gearbox structure comprises the gearbox structure according to any one of claims 1-9, and further comprises a chassis, and the main shell (1) is fixed on the chassis.