Transmission mechanism and engineering vehicle

Abstract

The invention relates to the technical field of engineering vehicles, and discloses a transmission mechanism and an engineering vehicle, and the transmission mechanism comprises a transmission shaft, an output shaft, a first clutch, a first planetary gear train, a second clutch, a second planetary gear train and a first locking device. The transmission shaft can be separated from or engaged with the power machine through the first clutch. In the first planetary gear train, a first sun gear is connected to the transmission shaft. The first planet carrier can be separated from or connected with the power machine through the second clutch. In the second planetary gear train, a second sun gear is connected to the transmission shaft, a second planet carrier is connected with the output shaft, and a first planet carrier is connected with the second gear ring. The first locking device is used for fixing or loosening the first gear ring. Three-gear transmission can be achieved by controlling the first locking device, the first clutch and the second clutch. When the three gears are switched, meshing among the gears does not need to be cut off, so that power interruption is avoided, the pause feeling during gear shifting is reduced, and abrasion among the gears during gear shifting is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of engineering vehicles, and in particular to a transmission mechanism and an engineering vehicle. Background Art

[0002] Engineering vehicles are special vehicles used for various engineering construction and operation tasks, such as excavators, bulldozers, road rollers and loaders. Since engineering vehicles are mainly used to perform various operations in various scenarios, they need to use at least two gears during operation to obtain different speeds and torques.

[0003] Existing engineering vehicles often use a sliding sleeve shifting method when shifting gears. The core principle is to achieve the meshing of different gear pairs by changing the position of the sliding gear on the shaft, thereby changing the transmission ratio and achieving the purpose of shifting gears. However, the sliding sleeve shifting method has the problem of power interruption during gear shifting, and it is easy to cause wear between gears during gear shifting.

[0004] Therefore, how to solve or improve the problem of power interruption and easy wear between gears when engineering vehicles shift gears in the related technology has become an important technical problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of this, the present application provides a transmission mechanism and an engineering vehicle to solve or improve the problem of power interruption and easy wear between gears when the engineering vehicle shifts gears.

[0006] In a first aspect, the present application provides a transmission mechanism, comprising:

[0007] Drive shaft, used to transmit power;

[0008] Output shaft, used for outputting power;

[0009] A first clutch connected to the transmission shaft and used for transmission connection with the power machine, so that the transmission shaft can be separated from or engaged with the power machine through the first clutch;

[0010] A first planetary gear train includes a first sun gear, a first planetary gear, a first ring gear and a first planet carrier, wherein the first planetary gear is rotatably connected to the first planet carrier, the first planetary gear is respectively meshed with the first sun gear and the first ring gear, and the first sun gear is connected to the transmission shaft;

[0011] a second clutch connected to the first planet carrier and used for transmission connection with the power machine, so that the first planet carrier can be separated from or engaged with the power machine through the second clutch;

[0012] A second planetary gear train includes a second sun gear, a second planetary gear, a second ring gear and a second planet carrier, wherein the second planetary gear is rotatably connected to the second planet carrier, the second planetary gear is meshed with the second sun gear and the second ring gear respectively, the second sun gear is connected to the transmission shaft, the second planet carrier is connected to the output shaft, and the first planet carrier is connected to the second ring gear;

[0013] The first locking device is connected to the first gear ring and is used to fix or loosen the first gear ring.

[0014] Optionally, it also includes:

[0015] The second locking device is connected to the second gear ring and is used to fix or loosen the first gear ring.

[0016] Optionally, it also includes:

[0017] A third planetary gear train, comprising a third sun gear, a third planetary gear, a third ring gear, a third planet carrier and a third locking device, wherein the third planetary gear is rotatably connected to the third planet carrier, the third planetary gear is respectively meshed with the third sun gear and the third ring gear, the third ring gear is drivingly connected to the output shaft, and the third sun gear is drivingly connected to the second ring gear;

[0018] The third locking device is connected to the third planet carrier and is used to fix or loosen the third planet carrier.

[0019] Optionally, the first locking device includes a third clutch, the third clutch includes a third outer hub and a third inner hub, the third outer hub is fixedly arranged, the third inner hub is connected to the first gear ring, and the third outer hub and the third inner hub can be separated from or engaged with each other;

[0020] And / or, the second locking device comprises a fourth clutch, the fourth clutch comprises a fourth outer hub and a fourth inner hub, the fourth outer hub is fixedly arranged, the fourth inner hub is connected to the second gear ring, and the fourth outer hub and the fourth inner hub can be separated from or engaged with each other;

[0021] And / or, the third locking device includes a fifth clutch, the fifth clutch includes a fifth outer hub and a fifth inner hub, the fifth outer hub is fixedly arranged, the fifth inner hub is connected to the third planetary carrier, and the fifth outer hub and the fifth inner hub can be separated from or engaged with each other.

[0022] Optionally, it further comprises an input shaft, a transmission hub and an output hub, wherein the input shaft is used to be connected to the power machine, and a mounting portion is provided on the input shaft, and the mounting portion is located between the first clutch and the second clutch;

[0023] The first clutch comprises a first outer hub and a first inner hub, the first outer hub and the first inner hub can be separated or engaged with each other, the first outer hub is connected to the mounting portion, and the first inner hub is connected to the transmission shaft at a side away from the mounting portion;

[0024] The second clutch includes a second outer hub and a second inner hub, the second outer hub and the second inner hub can be separated or engaged with each other, the second outer hub is connected to the mounting portion, the second inner hub is rotatably connected to the input shaft, the transmission hub is sleeved on the periphery of the first outer hub and the second outer hub, and the second inner hub is connected to the first end of the transmission hub, the output hub is connected to the second end of the transmission hub, and the output hub is connected to the first planetary carrier.

[0025] Optionally, the first clutch further comprises a first outer friction plate, a first inner friction plate, a first piston and a first elastic member, the first outer friction plate is slidably connected to the first outer hub and can rotate synchronously with the first outer hub, the first inner friction plate is slidably connected to the first inner hub and can rotate synchronously with the first inner hub, the first outer friction plate and the first inner friction plate can both slide along the axial direction of the input shaft, and the first outer friction plate and the first inner friction plate at least partially overlap along the axial direction of the input shaft;

[0026] A side of the mounting portion close to the first clutch forms a first sliding cavity with the input shaft. The first piston is slidably disposed in the first sliding cavity and can slide close to or away from the first outer friction plate. The first piston is connected to the outer wall of the input shaft through the first elastic member. When the first piston slides close to the first outer friction plate, it can push the first outer friction plate or the first inner friction plate, so that the first outer friction plate and the first inner friction plate are pressed against each other, and the first elastic member is compressed.

[0027] Optionally, the second clutch further comprises a third friction plate, a fourth friction plate, a second piston and a second elastic member, the third friction plate is slidably connected to the second outer hub and can rotate synchronously with the second outer hub, the fourth friction plate is slidably connected to the second inner hub and can rotate synchronously with the second inner hub, the third friction plate and the fourth friction plate can both slide along the axial direction of the input shaft, and the third friction plate and the fourth friction plate at least partially overlap along the axial direction of the input shaft;

[0028] A side of the mounting portion close to the second clutch forms a second sliding cavity with the input shaft. The second piston is slidably disposed in the second sliding cavity and can slide close to or away from the third friction plate. The second piston is connected to the outer wall of the input shaft through the second elastic member. When the second piston slides close to the third friction plate, it can push the third friction plate or the fourth friction plate so that the third friction plate and the fourth friction plate are pressed against each other and the second elastic member is compressed.

[0029] Optionally, a first control oil passage, a first channel, a second control oil passage and a second channel are provided in the input shaft;

[0030] A first oil port is provided on the cavity wall of the first sliding cavity, the first oil port is located on a side of the first piston away from the first outer friction plate, a first end of the first channel is communicated with the first control oil channel, and a second end of the first channel is communicated with the first oil port;

[0031] A second oil port is provided on the cavity wall of the second sliding cavity. The second oil port is located on the side of the second piston away from the third friction plate. The first end of the second channel is connected to the second control oil channel, and the second end of the second channel is connected to the second oil port.

[0032] Optionally, a lubricating oil passage, a third passage and a fourth passage are provided in the input shaft;

[0033] A third oil port is provided on the outer wall of the input shaft, the third oil port is located on the side of the first piston away from the second clutch, a first end of the third channel is communicated with the lubricating oil channel, and a second end of the third channel is communicated with the third oil port;

[0034] A fourth oil port is provided on the outer wall of the input shaft and is located on the side of the second piston away from the first clutch. A first end of the fourth channel is connected to the lubricating oil channel, and a second end of the fourth channel is connected to the fourth oil port.

[0035] In a second aspect, the present application also provides an engineering vehicle, comprising any of the transmission mechanisms described above.

[0036] The present application provides a transmission mechanism, which controls the first clutch so that the power machine is connected to the transmission shaft through the first clutch. The second clutch is controlled so that the power machine disconnects the transmission by separating from the first planetary carrier, and the first locking device fixes the first ring gear. At this time, the first sun gear, the first planetary gear, the first ring gear and the first planetary carrier form a planetary gear train with a fixed ring gear. At this time, it is the first gear. When the power machine is running, one route of power transmission is "the power machine drives the transmission shaft to rotate, the transmission shaft rotates to drive the first sun gear to rotate, the first sun gear drives the first planetary gear and even the first planetary carrier to rotate, thereby driving the second ring gear to rotate, the second ring gear drives the second planetary gear and even the second planetary carrier to rotate, and then drives the output shaft to rotate and output". Another route is "the power machine drives the transmission shaft to rotate, the transmission shaft rotates to drive the second sun gear to rotate, the second sun gear drives the second planetary gear and even the second planetary carrier to rotate, and then drives the output shaft to rotate and output". The output power of the final output shaft is the coupling of the output power of the two output routes.

[0037] The first clutch is controlled so that the power machine is connected to the transmission shaft through the first clutch. The second clutch is controlled so that the power machine is connected to the first planetary carrier through the second clutch, and the first locking device is released from the first ring gear. This is the second gear. When the power machine is running, one route of power transmission is "the power machine drives the transmission shaft to rotate, the transmission shaft drives the second sun gear to rotate, the second sun gear drives the second planetary gear and even the second planetary carrier to rotate, and then drives the output shaft to rotate and output". Another route is "the power machine drives the first planetary carrier to rotate, thereby directly driving the second ring gear to rotate, the second ring gear drives the second planetary gear and even the second planetary carrier to rotate, and then drives the output shaft to rotate and output". The output power of the final output shaft is the coupling of the output power of the two output routes.

[0038] The first clutch is controlled to separate the power machine from the transmission shaft and disconnect the transmission. The second clutch is controlled to make the power machine engage with the first planetary carrier through the second clutch and be connected in transmission, and the first locking device is used to fix the first ring gear. At this time, the first sun gear, the first planetary gear, the first ring gear and the first planetary carrier form a planetary gear train with a fixed ring gear. This is the third gear. When the power machine is running, one route of power transmission is "the power machine drives the first planetary carrier to rotate, thereby directly driving the second ring gear to rotate, the second ring gear drives the second planetary gear and even the second planetary carrier to rotate, and then drives the output shaft to rotate and output". Another route is "the power machine drives the first planetary carrier to rotate, thereby driving the first planetary gear to rotate, the first planetary gear drives the first sun gear to rotate, the first sun gear drives the transmission shaft to rotate, the transmission shaft rotates and drives the second sun gear to rotate, the second sun gear drives the second planetary gear and even the second planetary carrier to rotate, and then drives the output shaft to rotate and output". The output power of the final output shaft is the coupling of the output power of the two output routes.

[0039] In this way, by controlling the first locking device, the first clutch and the second clutch, transmission of three gears can be achieved. When switching between the first gear, the second gear and the third gear, it is only necessary to control the first locking device to fix or release the first gear ring, the first clutch to disengage or engage, and the second clutch to disengage or engage, without disconnecting the meshing between the gears, thereby avoiding power interruption, reducing the sense of frustration during gear shifting, and avoiding wear between gears during gear shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the related technologies, the drawings required for use in the specific implementation methods or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 A transmission schematic diagram of the first gear of a transmission mechanism according to an embodiment of the present application;

[0042] Figure 2 A transmission schematic diagram of the second gear of a transmission mechanism in an embodiment of the present application;

[0043] Figure 3 A transmission schematic diagram of the third gear of a transmission mechanism in an embodiment of the present application;

[0044] Figure 4 A transmission schematic diagram of the fourth gear of a transmission mechanism according to an embodiment of the present application;

[0045] Figure 5A transmission schematic diagram of the fifth gear of a transmission mechanism according to an embodiment of the present application;

[0046] Figure 6 This is a schematic diagram of the installation structure of the first clutch and the second clutch of a transmission mechanism according to an embodiment of the present application;

[0047] Figure 7 for Figure 6 A magnified schematic diagram of point A;

[0048] Figure 8 for Figure 6 An enlarged schematic diagram of point B.

[0049] Description of reference numerals:

[0050] 1. Transmission shaft; 2. Output shaft; 3. First planetary gear train; 31. First sun gear; 32. First planetary gear; 33. First planet carrier; 34. First ring gear; 4. First clutch; 41. First outer hub; 42. First inner hub; 43. First outer friction plate; 44. First inner friction plate; 45. First piston; 46. First elastic member; 5. Second planetary gear train; 51. Second sun gear; 52. Second planetary gear; 53. Second planet carrier; 54. Second ring gear; 6. Second clutch; 61. Second outer hub; 62. Second inner hub; 63. Second outer friction plate; 64. Second inner friction plate; 65. Second piston; 66. Second elastic member; 7. Third planetary gear train; 71. Third sun gear; 72. Third planetary gear; 73. Third planetary carrier; 74. Third ring gear; 8. Third clutch; 9. Fourth clutch; 10. Fifth clutch; 11. Input shaft; 1101. Mounting portion; 11011. First oil port; 11012. Second oil port; 112. First control oil passage; 113. First passage; 114. Second control oil passage; 115. Second passage; 116. Lubricating oil passage; 117. Third passage; 118. Third oil port; 119. Fourth passage; 1110. Fourth oil port; 1111. First annular groove; 1112. Fifth passage; 1113. Second annular groove; 1114. Sixth passage; 1115. Third annular groove; 1116. Seventh passage; 12. Transmission hub; 13. Output hub; 14. Power machine; 15. Housing. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0052] Below the joint Figures 1 to 8 , describing an embodiment of the present application.

[0053] According to an embodiment of the present application, on the one hand, a transmission mechanism is provided, such as Figures 1 to 5 As shown, it includes a transmission shaft 1, an output shaft 2, a first clutch 4, a first planetary gear train 3, a second clutch 6, a second planetary gear train 5 and a first locking device.

[0054] The transmission shaft 1 is used for transmitting power, and the output shaft 2 is used for outputting power.

[0055] The first clutch 4 is connected to the transmission shaft 1 and is used for transmission connection with the power machine 14. After the power machine 14 is connected to the transmission shaft 1 through the first clutch 4, the first clutch 4 can be controlled to make the power machine 14 engage with the transmission shaft 1 through the first clutch 4 to achieve transmission connection, or to make the power machine 14 separate from the transmission shaft 1 to disconnect the transmission.

[0056] The first planetary gear train 3 includes a first sun gear 31, a first planetary gear 32, a first ring gear 34 and a first planet carrier 33. The first planetary gear 32 is rotatably connected to the first planet carrier 33, the first sun gear 31 is meshed with the first planetary gear 32, and the first ring gear 34 is meshed with the first planetary gear 32, so that the first sun gear 31, the first planetary gear 32, the first ring gear 34 and the first planet carrier 33 form a planetary gear train, and the first sun gear 31 is connected to the transmission shaft 1, so that the first sun gear 31 can be driven to rotate when the transmission shaft 1 rotates.

[0057] The second clutch 6 is connected to the first planetary carrier 33 and is used for transmission connection with the power machine 14. After the power machine 14 is connected to the first planetary carrier 33 through the second clutch 6, the second clutch 6 can be controlled to make the power machine 14 engage with the first planetary carrier 33 through the second clutch 6 for transmission connection, or to make the power machine 14 separate from the first planetary carrier 33 to disconnect the transmission.

[0058] The second planetary gear train 5 includes a second sun gear 51, a second planetary gear 52, a second ring gear 54 and a second planet carrier 53. The second planetary gear 52 is rotatably connected to the second planet carrier 53, the second sun gear 51 is meshed with the second planetary gear 52, and the second ring gear 54 is meshed with the second planetary gear 52, so that the second sun gear 51, the second planetary gear 52, the second ring gear 54 and the second planet carrier 53 form a planetary gear train. The second sun gear 51 is connected to the transmission shaft 1 so that the second sun gear 51 can be driven to rotate when the transmission shaft 1 rotates. The second planet carrier 53 is connected to the output shaft 2 so that the second planet carrier 53 can drive the output shaft 2 to rotate when the second planet carrier 53 rotates. The first planet carrier 33 is connected to the second ring gear 54 so that the rotation of the first planet carrier 33 can drive the second ring gear 54 to rotate. The output shaft 2 is coaxial with the transmission shaft 1.

[0059] The first locking device is connected to the first ring gear 34 and can fix or loosen the first ring gear 34. The first ring gear 34 can rotate around the axis of the transmission shaft 1. When the first locking device loosens the first ring gear 34, the first ring gear 34 can rotate around the axis of the transmission shaft 1. When the first locking device fixes the first ring gear 34, the first ring gear 34 is fixed and cannot rotate.

[0060] In this way, by controlling the first locking device, the first clutch 4 and the second clutch 6, transmission of three gears can be achieved.

[0061] For the first gear, the first clutch 4 is controlled so that the power machine 14 is connected to the transmission shaft 1 through the first clutch 4. The second clutch 6 is controlled so that the power machine 14 is disconnected from the first planetary carrier 33 and the transmission is disconnected. At the same time, the first locking device fixes the first ring gear 34. Figure 1 As shown, at this time, the first sun gear 31, the first planetary gear 32, the first ring gear 34 and the first planet carrier 33 form a planetary gear train with a fixed ring gear. When the power machine 14 is running, the power has two transmission routes.

[0062] One of the routes is "the power machine 14 drives the transmission shaft 1 to rotate, the transmission shaft 1 rotates to drive the first sun gear 31 to rotate, the first sun gear 31 drives the first planetary gear 32 and even the first planetary carrier 33 to rotate, thereby driving the second ring gear 54 to rotate, the second ring gear 54 drives the second planetary gear 52 and even the second planetary carrier 53 to rotate, and then drives the output shaft 2 to rotate and output."

[0063] Another route is "the power machine 14 drives the transmission shaft 1 to rotate, the transmission shaft 1 rotates to drive the second sun gear 51 to rotate, the second sun gear 51 drives the second planetary gear 52 and even the second planetary carrier 53 to rotate, and then drives the output shaft 2 to rotate and output."

[0064] The output power of the final output shaft 2 is the coupling of the output power of the two output routes.

[0065] For the second gear, the first clutch 4 is controlled so that the power machine 14 is connected to the transmission shaft 1 through the first clutch 4. The second clutch 6 is controlled so that the power machine 14 is connected to the first planetary carrier 33 through the second clutch 6, and the first locking device is released from the first ring gear 34. Figure 2 As shown, when the power machine 14 is running, the power has two transmission routes.

[0066] One of the routes is "the power machine 14 drives the transmission shaft 1 to rotate, the transmission shaft 1 rotates to drive the second sun gear 51 to rotate, the second sun gear 51 drives the second planetary gear 52 and even the second planetary carrier 53 to rotate, and then drives the output shaft 2 to rotate and output."

[0067] Another route is "the power machine 14 drives the first planetary carrier 33 to rotate, thereby directly driving the second ring gear 54 to rotate, the second ring gear 54 drives the second planetary gear 52 and even the second planetary carrier 53 to rotate, and then drives the output shaft 2 to rotate and output."

[0068] The output power of the final output shaft 2 is the coupling of the output power of the two output routes.

[0069] For the third gear, the first clutch 4 is controlled to separate the power machine 14 from the transmission shaft 1 and disconnect the transmission. The second clutch 6 is controlled to make the power machine 14 engage with the first planetary carrier 33 through the second clutch 6 to achieve transmission connection, and the first locking device fixes the first ring gear 34. Figure 3 As shown, at this time, the first sun gear 31, the first planetary gear 32, the first ring gear 34 and the first planet carrier 33 form a planetary gear train with a fixed ring gear. When the power machine 14 is running, the power has two transmission routes.

[0070] One of the routes is "the power machine 14 drives the first planetary carrier 33 to rotate, thereby directly driving the second ring gear 54 to rotate, the second ring gear 54 drives the second planetary gear 52 and even the second planetary carrier 53 to rotate, and then drives the output shaft 2 to rotate and output."

[0071] Another route is "the power machine 14 drives the first planetary carrier 33 to rotate, thereby driving the first planetary gear 32 to rotate, the first planetary gear 32 drives the first sun gear 31 to rotate, the first sun gear 31 drives the transmission shaft 1 to rotate, the transmission shaft 1 rotates to drive the second sun gear 51 to rotate, the second sun gear 51 drives the second planetary gear 52 and even the second planetary carrier 53 to rotate, and then drives the output shaft 2 to rotate and output."

[0072] The output power of the final output shaft 2 is the coupling of the output power of the two output routes.

[0073] When switching between the first gear, the second gear and the third gear, it is only necessary to control the first locking device to fix or release the first ring gear 34, the first clutch 4 to disengage or engage, and the second clutch 6 to disengage or engage. There is no need to disconnect the meshing between the gears, thereby avoiding power interruption, reducing the sense of frustration during gear shifting, and avoiding wear between gears during gear shifting.

[0074] Moreover, since the three gears all have the transmission route of "transmission shaft 1 rotates to drive the second sun gear 51 to rotate, the second sun gear 51 drives the second planetary gear 52 and even the second planetary carrier 53 to rotate, and then drives the output shaft 2 to rotate and output", when switching between the two gears, the transmission route of "the first sun gear 31 drives the first planetary gear 32 and even the first planetary carrier 33 to rotate, thereby driving the output shaft 2 to rotate and output" always maintains the transmission output, avoiding power interruption, and also reduces the sense of frustration when shifting gears.

[0075] At the same time, the first planetary gear train 3 and the second planetary gear train 5 can share the axial load of the output shaft 2 to reduce the load on the output shaft 2 during output and improve transmission reliability.

[0076] The power machine 14 may be an engine, an electric motor, or a hybrid power of an engine and an electric motor.

[0077] In a further embodiment, Figure 4 As shown, the transmission mechanism also includes a second locking device, which is connected to the second ring gear 54 and can fix or loosen the second ring gear 54. The second ring gear 54 can rotate around the axis of the transmission shaft 1. When the second locking device loosens the second ring gear 54, the second ring gear 54 can rotate around the axis of the transmission shaft 1. When the second locking device fixes the second ring gear 54, the second ring gear 54 is fixed and cannot rotate.

[0078] In this way, the fourth gear can be achieved. Specifically, the first clutch 4 is controlled so that the power machine 14 is connected to the transmission shaft 1 through the first clutch 4. The second clutch 6 is controlled so that the power machine 14 is disconnected from the first planetary carrier 33 and the transmission is disconnected. At the same time, the first locking device releases the first ring gear 34, and the second locking device fixes the second ring gear 54. At this time, the second sun gear 51, the second planetary gear 52, the second ring gear 54 and the second planetary carrier 53 form a planetary gear train with a fixed ring gear. When the power machine 14 is running, the power has only one transmission route.

[0079] The transmission route is "the power machine 14 drives the transmission shaft 1 to rotate, the transmission shaft 1 rotates to drive the second sun gear 51 to rotate, the second sun gear 51 drives the second planetary gear 52 and even the second planetary carrier 53 to rotate, and then drives the output shaft 2 to rotate and output."

[0080] At this time, for the first gear, Figure 1 As shown, the first clutch 4 is controlled so that the power machine 14 is connected to the transmission shaft 1 through the first clutch 4. The second clutch 6 is controlled so that the power machine 14 is disconnected from the first planetary carrier 33, and the first locking device fixes the first ring gear 34, and the second locking device releases the second ring gear 54.

[0081] At this time, for the second gear, Figure 2 As shown, the first clutch 4 is controlled so that the power machine 14 is engaged with the transmission shaft 1 through the first clutch 4 and is transmission-connected. The second clutch 6 is controlled so that the power machine 14 is engaged with the first planetary carrier 33 through the second clutch 6 and is transmission-connected. At the same time, the first locking device releases the first ring gear 34, and the second locking device releases the second ring gear 54.

[0082] At this time, for the third gear, Figure 3 As shown, the first clutch 4 is controlled to separate the power machine 14 from the transmission shaft 1 and disconnect the transmission. The second clutch 6 is controlled to make the power machine 14 engage with the first planetary carrier 33 through the second clutch 6 to achieve transmission connection, and at the same time, the first locking device fixes the first ring gear 34, and the second locking device releases the second ring gear 54.

[0083] In this way, by controlling the first locking device, the first clutch 4, the second clutch 6 and the second locking device, transmission of four gears can be achieved.

[0084] When switching between the first gear, the second gear, the third gear and the fourth gear, it is only necessary to control the first locking device to fix or release the first ring gear 34, the first clutch 4 to disengage or engage, the second clutch 6 to disengage or engage, and the second locking device to fix or release the second ring gear 54. There is no need to disconnect the meshing between the gears, thereby avoiding power interruption, reducing the sense of frustration during gear shifting, and avoiding wear between gears during gear shifting.

[0085] Moreover, since the four gears all have the transmission route of "the transmission shaft 1 rotates to drive the second sun gear 51 to rotate, the second sun gear 51 drives the second planetary gear 52 and even the second planetary carrier 53 to rotate, and then drives the output shaft 2 to rotate and output", when switching between the two gears, the transmission route of "the first sun gear 31 drives the first planetary gear 32 and even the first planetary carrier 33 to rotate, thereby driving the output shaft 2 to rotate and output" always maintains the transmission output, avoiding power interruption, and also reduces the sense of frustration when shifting gears.

[0086] In yet a further embodiment, Figure 5As shown, the transmission mechanism also includes a third planetary gear train 7 and a third locking device. The third planetary gear train 7 includes a third sun gear 71, a third planetary gear 72, a third ring gear 74 and a third planet carrier 73. The third planetary gear 72 is rotatably connected to the third planet carrier 73, the third planetary gear 72 is meshed with the third sun gear 71, and the third ring gear 74 is meshed with the third planetary gear 72, so that the third sun gear 71, the third planetary gear 72, the third ring gear 74 and the third planet carrier 73 form a planetary gear train.

[0087] The third gear ring 74 is in driving connection with the output shaft 2, so that the rotation of the third gear ring 74 can drive the output shaft 2 to rotate and output. The third sun gear 71 is in driving connection with the second gear ring 54, so that the rotation of the second gear ring 54 can drive the third sun gear 71 to rotate.

[0088] The third locking device is connected to the third planetary carrier 73 and can fix or loosen the third planetary carrier 73. The third planetary carrier 73 can rotate around the axis of the output shaft 2. When the third locking device loosens the third planetary carrier 73, the third planetary carrier 73 can rotate around the axis of the output shaft 2. When the third locking device fixes the third planetary carrier 73, the third planetary carrier 73 is fixed and cannot rotate.

[0089] In this way, the fifth gear can be achieved. Specifically, the first clutch 4 is controlled so that the power machine 14 is connected to the transmission shaft 1 through the first clutch 4. The second clutch 6 is controlled so that the power machine 14 is disconnected from the first planetary carrier 33 and the transmission is disconnected. At the same time, the first locking device releases the first ring gear 34, the second locking device releases the second ring gear 54, and the third locking device locks the third planetary carrier 73. At this time, the third sun gear 71, the third planetary gear 72, the third ring gear 74 and the third planetary carrier 73 form a planetary gear train with a fixed planetary carrier. When the power machine 14 is running, the power has two transmission routes.

[0090] One of the transmission routes is "the power machine 14 drives the transmission shaft 1 to rotate, the transmission shaft 1 rotates to drive the second sun gear 51 to rotate, the second sun gear 51 drives the second planetary gear 52 and even the second planetary carrier 53 to rotate, and then drives the output shaft 2 to rotate and output."

[0091] Another transmission route is "the power machine 14 drives the transmission shaft 1 to rotate, the transmission shaft 1 rotates to drive the second sun gear 51 to rotate, the second sun gear 51 drives the second planetary gear 52 to rotate, the second planetary gear 52 drives the second ring gear 54 to rotate, the second ring gear 54 drives the third sun gear 71 to rotate, the third sun gear 71 drives the third planetary gear 72 to rotate, the third planetary gear 72 drives the third ring gear 74 to rotate, and then drives the output shaft 2 to rotate and output."

[0092] The output power of the final output shaft 2 is the coupling of the output power of the two output routes.

[0093] At this time, for the first gear, Figure 1 As shown, the first clutch 4 is controlled so that the power machine 14 is connected to the transmission shaft 1 through the first clutch 4. The second clutch 6 is controlled so that the power machine 14 is disconnected from the first planetary carrier 33, and the first locking device fixes the first ring gear 34, the second locking device releases the second ring gear 54, and the third locking device releases the third planetary carrier 73.

[0094] At this time, for the second gear, Figure 2 As shown, the first clutch 4 is controlled so that the power machine 14 is engaged with the transmission shaft 1 through the first clutch 4 and is transmission-connected. The second clutch 6 is controlled so that the power machine 14 is engaged with the first planetary carrier 33 through the second clutch 6 and is transmission-connected. At the same time, the first locking device is released from the first ring gear 34, the second locking device is released from the second ring gear 54, and the third locking device is released from the third planetary carrier 73.

[0095] At this time, for the third gear, Figure 3 As shown, the first clutch 4 is controlled to separate the power machine 14 from the transmission shaft 1 and disconnect the transmission. The second clutch 6 is controlled to make the power machine 14 engage with the first planetary carrier 33 through the second clutch 6 to achieve transmission connection. At the same time, the first locking device fixes the first ring gear 34, the second locking device releases the second ring gear 54, and the third locking device releases the third planetary carrier 73.

[0096] At this time, for the fourth gear, Figure 4 As shown, the first clutch 4 is controlled so that the power machine 14 is connected to the transmission shaft 1 through the first clutch 4. The second clutch 6 is controlled so that the power machine 14 is disconnected from the first planetary carrier 33, and the first locking device is released from the first ring gear 34, the second locking device is fixed to the second ring gear 54, and the third locking device is released from the third planetary carrier 73.

[0097] In this way, by controlling the first locking device, the first clutch 4, the second clutch 6, the second locking device and the third locking device, transmission of five gears can be achieved.

[0098] When switching between the first gear, the second gear, the third gear, the fourth gear and the fifth gear, it is only necessary to control the first locking device to fix or release the first ring gear 34, the first clutch 4 to disengage or engage, the second clutch 6 to disengage or engage, the second locking device to fix or release the second ring gear 54, and the third locking device to fix or release the third ring gear 74. There is no need to disconnect the meshing between the gears, thereby avoiding power interruption, reducing the sense of frustration during gear shifting, and avoiding wear between gears during gear shifting.

[0099] Moreover, since the five gears all have the transmission route of "the transmission shaft 1 rotates to drive the second sun gear 51 to rotate, the second sun gear 51 drives the second planetary gear 52 and even the second planetary carrier 53 to rotate, and then drives the output shaft 2 to rotate and output", when switching between two gears, the transmission route of "the first sun gear 31 drives the first planetary gear 32 and even the first planetary carrier 33 to rotate, thereby driving the output shaft 2 to rotate and output" always maintains the transmission output, avoiding power interruption, and also reduces the sense of frustration when shifting gears.

[0100] It is worth noting that the final output speeds of the fifth gear, the fourth gear, the first gear, the second gear and the third gear increase in sequence.

[0101] As an optional embodiment, the first locking device includes a third clutch 8, which is a friction plate clutch, which is a commonly used clutch. It includes a third outer hub, a third inner hub, a third outer friction plate, a third inner friction plate and a third piston. The third outer hub is located outside the third inner hub. The inner circumference of the third outer hub is provided with a first spline groove in the axial direction. The outer side edge of the third outer friction plate is provided with a first spline, and the first spline is slidably arranged in the first spline groove. The outer circumference of the third inner hub is provided with a second spline groove in the axial direction. The inner side edge of the third inner friction plate is provided with a second spline, and the second spline is slidably arranged in the second spline groove.

[0102] When the oil pushes the third piston to slide in the third piston groove, it can push the third outer friction plate or the third inner friction plate, so that when the third outer friction plate and the third inner friction plate are pressed against each other, the third outer hub and the third inner hub are relatively fixed in the circumferential direction, and the third outer hub and the third inner hub are engaged with each other. When the third outer friction plate and the third inner friction plate are separated, the third outer hub and the third inner hub can rotate relatively in the circumferential direction, and the third outer hub and the third inner hub are separated from each other.

[0103] Specifically, the third outer hub is fixedly connected to the frame or housing 15, and the third inner hub is connected to the first gear ring 34. Thus, the first gear ring 34 is fixed when the third outer friction plate and the third inner friction plate are pressed against each other, and the first gear ring 34 is released when the third outer friction plate and the third inner friction plate are separated from each other.

[0104] The first locking device may also be a brake device, which uses the friction between brake pads to fix and release the first gear ring 34.

[0105] The second locking device may include a fourth clutch 9, which is a friction plate clutch, and the friction plate clutch is a commonly used clutch. It includes a fourth outer hub, a fourth inner hub, a fourth outer friction plate, a fourth inner friction plate and a fourth piston. The fourth outer hub is located outside the fourth inner hub. A third spline groove is axially provided on the inner circumference of the fourth outer hub. A third spline is provided on the outer side of the fourth outer friction plate, and the third spline is slidably arranged in the third spline groove. A fourth spline groove is axially provided on the outer circumference of the fourth inner hub. A fourth spline is provided on the inner side of the fourth inner friction plate, and the fourth spline is slidably arranged in the fourth spline groove.

[0106] When the oil pushes the fourth piston to slide in the fourth piston groove, it can push the fourth outer friction plate or the fourth inner friction plate, so that when the fourth outer friction plate and the fourth inner friction plate are pressed against each other, the fourth outer hub and the fourth inner hub are relatively fixed in the circumferential direction, and the fourth outer hub and the fourth inner hub are engaged with each other. When the fourth outer friction plate and the fourth inner friction plate are separated, the fourth outer hub and the fourth inner hub can rotate relatively in the circumferential direction, and the fourth outer hub and the second inner hub 62 are separated from each other.

[0107] Specifically, the fourth outer hub is fixedly connected to the frame or housing 15, and the fourth inner hub is connected to the second gear ring 54. Thus, the second gear ring 54 is fixed when the fourth outer friction plate and the fourth inner friction plate are pressed against each other, and the second gear ring 54 is released when the fourth outer friction plate and the fourth inner friction plate are separated from each other.

[0108] The second locking device may also be a brake device, which uses the friction between brake pads to fix and release the second gear ring 54.

[0109] The third locking device may include a fifth clutch 10, which is a friction plate clutch, and is a commonly used clutch. It includes a fifth outer hub, a fifth inner hub, a fifth outer friction plate, a fifth inner friction plate, and a fifth piston. The fifth outer hub is located outside the fifth inner hub. A fifth spline groove is axially provided on the inner circumference of the fifth outer hub. A fifth spline is provided on the outer side of the fifth outer friction plate, and the fifth spline is slidably arranged in the fifth spline groove. A sixth spline groove is axially provided on the outer circumference of the fifth inner hub. A sixth spline is provided on the inner side of the fifth inner friction plate, and the sixth spline is slidably arranged in the sixth spline groove.

[0110] When the oil pushes the fifth piston to slide in the fifth piston groove, it can push the fifth outer friction plate or the fifth inner friction plate, so that when the fifth outer friction plate and the fifth inner friction plate are pressed against each other, the fifth outer hub and the fifth inner hub are relatively fixed in the circumferential direction, and the fifth outer hub and the fifth inner hub are engaged with each other. When the fifth outer friction plate and the fifth inner friction plate are separated, the fifth outer hub and the fifth inner hub can rotate relatively in the circumferential direction, and the fifth outer hub and the fifth inner hub are separated from each other.

[0111] Specifically, the fifth outer hub is fixedly connected to the frame or housing 15, and the fifth inner hub is connected to the third gear ring 74. Thus, the third planet carrier 73 is fixed when the fifth outer friction plate and the fifth inner friction plate are pressed against each other, and the third planet carrier 73 is released when the fifth outer friction plate and the fifth inner friction plate are separated from each other.

[0112] The third locking device may also be a brake device, which uses the friction between brake pads to fix and release the third planet carrier 73.

[0113] Among them, any one of the first locking device, the second locking device and the third locking device can be set as a friction plate clutch, any two of them can be set as friction plate clutches, or all of them can be set as friction plate clutches, so that the gear shifting is smoother and the setback is reduced.

[0114] As an optional embodiment, Figure 6 As shown, the transmission mechanism further includes an input shaft 11, a transmission hub 12 and an output hub 13. The transmission hub 12 and the output hub 13 are both annular. The output hub 13 is connected to the first planet carrier 33, so that the rotation of the output hub 13 can drive the first planet carrier 33 to rotate.

[0115] The input shaft 11 is used to be connected to the power machine 14 so that the power machine 14 can drive the input shaft 11 to rotate. A mounting portion 1101 is provided in an annular shape on the input shaft 11 so that the mounting portion 1101 is located between the first clutch 4 and the second clutch 6 .

[0116] The first clutch 4 includes a first outer hub 41 and a first inner hub 42, which can be engaged or disengaged with each other. The first outer hub 41 is connected to the mounting portion 1101, so that when the input shaft 11 rotates, the mounting portion 1101 is driven to rotate, thereby driving the first outer hub 41 to rotate.

[0117] The first inner hub 42 is connected to the transmission shaft 1 at a side away from the mounting portion 1101, so that when the first outer hub 41 and the first inner hub 42 are engaged with each other, the rotation of the input shaft 11 drives the mounting portion 1101 to rotate, the mounting portion 1101 drives the first outer hub 41 to rotate, the first outer hub 41 drives the first inner hub 42 to rotate, and thus drives the transmission shaft 1 to rotate. When the first outer hub 41 and the first inner hub 42 are separated from each other, the rotation of the first outer hub 41 cannot drive the first inner hub 42 to rotate, so that the power will not be transmitted to the transmission shaft 1.

[0118] The second clutch 6 includes a second outer hub 61 and a second inner hub 62, which can be engaged or disengaged with each other. The second outer hub 61 is connected to the mounting portion 1101, so that when the input shaft 11 rotates, the mounting portion 1101 is driven to rotate, thereby driving the second outer hub 61 to rotate.

[0119] The second inner hub 62 is rotatably connected to the input shaft 11. The transmission hub 12 is sleeved on the periphery of the first outer hub 41 and the second outer hub 61, and the transmission hub 12 has a first end and a second end. An extension portion is provided on the second inner hub 62, and the second inner hub 62 is connected to the first end of the transmission hub 12 through the extension portion. The second end of the transmission hub 12 is transmission-connected to the output hub 13, and the output hub 13 is rotationally connected to the housing 15.

[0120] In this way, when the second outer hub 61 and the first inner hub 42 are engaged with each other, the rotation of the input shaft 11 drives the mounting portion 1101 to rotate, the mounting portion 1101 drives the second outer hub 61 to rotate, the second outer hub 61 drives the second inner hub 62 to rotate, the second inner hub 62 drives the transmission hub 12 to rotate, the transmission hub 12 drives the output hub 13 to rotate, thereby driving the first planetary carrier 33 to rotate. When the second outer hub 61 and the first inner hub 42 are separated from each other, the second outer hub 61 cannot drive the second inner hub 62 to rotate, and thus the power will not be transmitted to the first planetary carrier 33.

[0121] In this way, the first clutch 4 and the second clutch 6 are arranged together, making the structure more compact and realizing the same-side output of the dual clutch structure.

[0122] As an optional embodiment, Figure 7 As shown, the first clutch 4 is a friction plate clutch, and the first clutch 4 also includes a first outer friction plate 43, a first inner friction plate 44, a first piston 45 and a first elastic member 46. The first outer hub 41 is located at the periphery of the first inner hub 42. A seventh spline groove is axially provided on the inner circumferential surface of the first outer hub 41, and a seventh spline is provided on the outer side of the first outer friction plate 43, and the first spline is slidably provided in the seventh spline groove. Therefore, the first outer friction plate 43 is slidably connected to the first outer hub 41 and can rotate synchronously with the first outer hub 41.

[0123] An eighth spline groove is provided in the axial direction on the outer peripheral surface of the first inner hub 42, and an eighth spline is provided on the inner side of the second inner friction plate 64, and the eighth spline is slidably arranged in the eighth spline groove. Thus, the first inner friction plate 44 is slidably connected to the first inner hub 42 and can rotate synchronously with the first inner hub 42.

[0124] The first outer friction plate 43 and the first inner friction plate 44 can both slide along the axial direction of the input shaft 11, and the first outer friction plate 43 and the first inner friction plate 44 at least partially overlap along the axial direction of the input shaft 11, so that the first outer friction plate 43 and the first inner friction plate 44 can press against each other when they slide and approach each other.

[0125] A first sliding cavity is formed between the side of the mounting portion 1101 close to the first clutch 4 and the input shaft 11, and the first piston 45 is slidably disposed in the first sliding cavity. When the first piston 45 slides in the first sliding cavity, it slides along the axial direction of the input shaft 11 and approaches or moves away from the first outer friction plate 43. The first piston 45 is connected to the outer wall of the input shaft 11 through the first elastic member 46.

[0126] When the first clutch 4 needs to be switched to the engaged state, when the first piston 45 is driven to slide continuously close to the first outer friction plate 43, the first outer friction plate 43 or the first inner friction plate 44 can be pushed, so that the first outer friction plate 43 and the first inner friction plate 44 are close to each other and pressed tightly, so that the first outer friction plate 43 and the first inner friction plate 44 are engaged, and then the first outer hub 41 and the first inner hub 42 can rotate synchronously. At this time, the first elastic member 46 is compressed.

[0127] When it is necessary to switch the first clutch 4 to the disengaged state, the driving force on the first piston 45 is canceled, the first elastic member 46 rebounds and pushes the piston to slide away from the first outer friction plate 43, so that the first outer friction plate 43 and the first inner friction plate 44 are separated and no longer pressed against each other, so that the first outer hub 41 and the first inner hub 42 cannot rotate synchronously.

[0128] As an optional embodiment, Figure 8 As shown, the second clutch 6 is a friction plate clutch, and the second clutch 6 also includes a second outer friction plate 63, a second inner friction plate 64, a second piston 65 and a second elastic member 66. The second outer hub 61 is located at the periphery of the second inner hub 62. A ninth spline groove is axially provided on the inner circumference of the second outer hub 61, and a ninth spline is provided on the outer side of the second outer friction plate 63, and the second spline is slidably provided in the ninth spline groove. Thus, the second outer friction plate 63 is slidably connected to the second outer hub 61 and can rotate synchronously with the second outer hub 61.

[0129] The outer circumference of the second inner hub 62 is provided with a tenth spline groove in the axial direction, and the inner side of the second inner friction plate 64 is provided with a tenth spline, and the tenth spline is slidably arranged in the tenth spline groove. Thus, the second outer friction plate 63 is slidably connected to the second inner hub 62 and can rotate synchronously with the second inner hub 62.

[0130] The second outer friction plate 63 and the second inner friction plate 64 can both slide along the axial direction of the input shaft 11, and the second outer friction plate 63 and the second inner friction plate 64 at least partially overlap along the axial direction of the input shaft 11, so that the second outer friction plate 63 and the second inner friction plate 64 can press against each other when they slide and approach each other.

[0131] A second sliding cavity is formed between the side of the mounting portion 1101 close to the second clutch 6 and the input shaft 11, and the second piston 65 is slidably disposed in the second sliding cavity. When the second piston 65 slides in the second sliding cavity, it slides along the axial direction of the input shaft 11 and approaches or moves away from the second outer friction plate 63. The second piston 65 is connected to the outer wall of the input shaft 11 through the second elastic member 66.

[0132] When the second clutch 6 needs to be switched to the engaged state, when the second piston 65 is driven to slide continuously close to the second outer friction plate 63, the second outer friction plate 63 or the second inner friction plate 64 can be pushed, so that the second outer friction plate 63 and the second inner friction plate 64 are close to each other and pressed tightly, so that the second outer friction plate 63 and the second inner friction plate 64 are engaged, and then the second outer hub 61 and the second inner hub 62 can rotate synchronously. At this time, the second elastic member 66 is compressed.

[0133] When it is necessary to switch the second clutch 6 to the disengaged state, the driving force on the second piston 65 is canceled, the second elastic member 66 rebounds and pushes the piston to slide away from the second outer friction plate 63, so that the second outer friction plate 63 and the second inner friction plate 64 are separated and no longer pressed against each other, so that the second outer hub 61 and the second inner hub 62 cannot rotate synchronously.

[0134] As an optional embodiment, Figures 6 to 8 As shown, a first control oil passage 112 , a first channel 113 , a second control oil passage 114 and a second channel 115 are opened in the input shaft 11 .

[0135] A first oil port 11011 is provided on the cavity wall of the first sliding cavity, so that the first oil port 11011 is located on the side of the first piston 45 away from the first outer friction plate 43. Thus, when the oil enters the first sliding cavity from the first oil port 11011, the first piston 45 is pushed to slide close to the first outer friction plate 43.

[0136] The first channel 113 has a first end and a second end, and the first end of the first channel 113 is in communication with the first control oil channel 112. The second end of the first channel 113 is in communication with the first oil port 11011. In this way, oil can be introduced into the first control oil channel 112, and then the oil enters the first sliding cavity from the first oil port 11011 through the first channel 113, pushing the first piston 45 to slide close to the first outer friction plate 43. When the first elastic member 46 rebounds and pushes the piston to slide away from the second outer friction plate 63, the oil on the side of the first piston 45 away from the first outer friction plate 43 enters the first control oil channel 112 from the first oil port 11011 through the first channel 113 and is then discharged. The sliding of the first piston 45 is controlled by the oil.

[0137] A first annular groove 1111 is formed on the outer wall of the input shaft 11, and a fifth channel 1112 is formed on the input shaft 11. The first annular groove 1111 is connected to the first control oil channel 112 through the fifth channel 1112. In this way, when oil is passed into the first annular groove 1111, the oil can be passed into the first control oil channel 112 through the fifth channel 1112.

[0138] A second oil port 11012 is provided on the cavity wall of the second sliding cavity, so that the second oil port 11012 is located on the side of the second piston 65 away from the second outer friction plate 63. In this way, when the oil enters the second sliding cavity from the second oil port 11012, the second piston 65 is pushed to slide close to the second outer friction plate 63.

[0139] The second channel 115 has a first end and a second end, and the first end of the second channel 115 is communicated with the second control oil channel 114. The second end of the second channel 115 is communicated with the second oil port 11012. In this way, oil can be introduced into the second control oil channel 114, and then the oil enters the second sliding cavity from the second oil port 11012 through the second channel 115, pushing the second piston 65 to slide close to the second outer friction plate 63. When the second elastic member 66 rebounds and pushes the piston to slide away from the second outer friction plate 63, the oil on the side of the second piston 65 away from the second outer friction plate 63 enters the second control oil channel 114 from the second oil port 11012 through the second channel 115 and is then discharged. The sliding of the second piston 65 is controlled by the oil.

[0140] A second annular groove 1113 is formed on the outer wall of the input shaft 11, and a sixth channel 1114 is formed on the input shaft 11. The second annular groove 1113 is connected to the second control oil channel 114 through the sixth channel 1114. In this way, when oil is passed into the second annular groove 1113, the oil can be passed into the second control oil channel 114 through the sixth channel 1114.

[0141] A first sealing ring is disposed on the outer wall of the input shaft, and the first sealing ring is located between the first annular groove 1111 and the second annular groove 1113 .

[0142] As an optional implementation, Figures 6 to 8 As shown, a lubricating oil passage 116 , a third passage 117 and a fourth passage 119 are opened in the input shaft 11 .

[0143] A third oil port 118 is provided on the outer wall of the input shaft 11, and the third oil port 118 is located on the side of the first piston 45 away from the second clutch 6. In this way, the lubricating oil can enter the space of the first piston 45 away from the second clutch 6 from the third oil port 118, so as to lubricate the first outer friction plate 43 and the first inner friction plate 44, and reduce the wear between the first outer friction plate 43 and the second outer friction plate 63. In addition, when the first inner hub 42 is rotatably connected to the input shaft 11 through the first bearing, the first bearing can also be lubricated.

[0144] A fourth oil port 1110 is provided on the outer wall of the input shaft 11, and the fourth oil port 1110 is located on the side of the second piston 65 away from the second clutch 6. In this way, lubricating oil can enter the space on the side of the second piston 65 away from the second clutch 6 from the fourth oil port 1110, so as to lubricate the second outer friction plate 63 and the second inner friction plate 64, and reduce the wear between the first outer friction plate 43 and the second outer friction plate 63. In addition, when the second inner hub 62 is rotatably connected to the input shaft 11 through the second bearing, the second bearing can also be lubricated.

[0145] A third annular groove 1115 is formed on the outer wall of the input shaft 11, and a seventh channel 1116 is formed on the input shaft 11. The third annular groove 1115 is connected to the lubricating oil passage 116 through the seventh channel 1116. Thus, when oil is passed into the third annular groove 1115, the oil can be passed into the lubricating oil passage 116 through the seventh channel 1116.

[0146] A second sealing ring is disposed on the outer wall of the input shaft, and the second sealing ring is located between the third annular groove 1115 and the second annular groove 1113 .

[0147] According to an embodiment of the present application, on the other hand, an engineering vehicle is also provided, comprising any of the above transmission mechanisms. The technical effect brought by the engineering vehicle is consistent with that of the transmission mechanism, so it will not be described in detail.

[0148] The engineering vehicle may be an excavator, a loader or a bulldozer.

[0149] Although the embodiments of the present application are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the present application.

Claims

1. A transmission mechanism, characterized in that: include: A transmission shaft (1) for transmitting power; An output shaft (2), used for outputting power; A first clutch (4) connected to the transmission shaft (1) and used for transmission connection with a power machine (14), so that the transmission shaft (1) can be separated from or engaged with the power machine (14) through the first clutch (4); A first planetary gear train (3), comprising a first sun gear (31), a first planetary gear (32), a first ring gear (34) and a first planet carrier (33), wherein the first planetary gear (32) is rotatably connected to the first planet carrier (33), the first planetary gear (32) is meshed with the first sun gear (31) and the first ring gear (34) respectively, and the first sun gear (31) is connected to the transmission shaft (1); a second clutch (6) connected to the first planet carrier (33) and used for transmission connection with the power machine (14), so that the first planet carrier (33) can be separated from or engaged with the power machine (14) through the second clutch (6); A second planetary gear train (5), comprising a second sun gear (51), a second planetary gear (52), a second ring gear (54) and a second planet carrier (53), wherein the second planetary gear (52) is rotatably connected to the second planet carrier (53), the second planetary gear (52) is meshed with the second sun gear (51) and the second ring gear (54) respectively, the second sun gear (51) is connected to the transmission shaft (1), the second planet carrier (53) is connected to the output shaft (2), and the first planet carrier (33) is connected to the second ring gear (54); The first locking device is connected to the first gear ring (34) and is used to fix or loosen the first gear ring (34).

2. The transmission mechanism according to claim 1, characterized in that: Also includes: The second locking device is connected to the second gear ring (54) and is used to fix or loosen the first gear ring (34).

3. The transmission mechanism according to claim 2, characterized in that: Also includes: A third planetary gear train (7), comprising a third sun gear (71), a third planetary gear (72), a third ring gear (74), a third planet carrier (73) and a third locking device, wherein the third planetary gear (72) is rotatably connected to the third planet carrier (73), the third planetary gear (72) is meshed with the third sun gear (71) and the third ring gear (74) respectively, the third ring gear (74) is transmission-connected to the output shaft (2), and the third sun gear (71) is transmission-connected to the second ring gear (54); A third locking device is connected to the third planet carrier (73) and is used to fix or loosen the third planet carrier (73).

4. The transmission mechanism according to claim 3, characterized in that: The first locking device comprises a third clutch (8), the third clutch (8) comprises a third outer hub and a third inner hub, the third outer hub is fixedly arranged, the third inner hub is connected to the first gear ring (34), and the third outer hub and the third inner hub can be separated from or engaged with each other; And / or, the second locking device comprises a fourth clutch (9), the fourth clutch (9) comprises a fourth outer hub and a fourth inner hub, the fourth outer hub is fixedly arranged, the fourth inner hub is connected to the second gear ring (54), and the fourth outer hub and the fourth inner hub can be separated from or engaged with each other; And / or, the third locking device includes a fifth clutch (10), the fifth clutch (10) includes a fifth outer hub and a fifth inner hub, the fifth outer hub is fixedly arranged, the fifth inner hub is connected to the third planetary carrier (73), and the fifth outer hub and the fifth inner hub can be separated from or engaged with each other.

5. The transmission mechanism according to claim 1, characterized in that: It also comprises an input shaft (11), a transmission hub (12) and an output hub (13), wherein the input shaft (11) is used to be connected to the power machine (14), and a mounting portion (1101) is provided on the input shaft (11), and the mounting portion (1101) is located between the first clutch (4) and the second clutch (6); The first clutch (4) comprises a first outer hub (41) and a first inner hub (42), the first outer hub (41) and the first inner hub (42) being separable from or engageable with each other, the first outer hub (41) being connected to the mounting portion (1101), and the first inner hub (42) being connected to the transmission shaft (1) at a side facing away from the mounting portion (1101); The second clutch (6) comprises a second outer hub (61) and a second inner hub (62), the second outer hub (61) and the second inner hub (62) can be separated from or engaged with each other, the second outer hub (61) is connected to the mounting portion (1101), the second inner hub (62) is rotatably connected to the input shaft (11), the transmission hub (12) is sleeved on the periphery of the first outer hub (41) and the second outer hub (61), and the second inner hub (62) is connected to the first end of the transmission hub (12), the output hub (13) is connected to the second end of the transmission hub (12), and the output hub (13) is connected to the first planet carrier (33).

6. The transmission mechanism according to claim 5, characterized in that: The first clutch (4) further comprises a first outer friction plate (43), a first inner friction plate (44), a first piston (45) and a first elastic member (46); the first outer friction plate (43) is slidably connected to the first outer hub (41) and can rotate synchronously with the first outer hub (41); the first inner friction plate (44) is slidably connected to the first inner hub (42) and can rotate synchronously with the first inner hub (42); the first outer friction plate (43) and the first inner friction plate (44) can both slide along the axial direction of the input shaft (11); the first outer friction plate (43) and the first inner friction plate (44) at least partially overlap along the axial direction of the input shaft (11); The side of the mounting portion (1101) close to the first clutch (4) forms a first sliding cavity with the input shaft (11); the first piston (45) is slidably arranged in the first sliding cavity and can slide close to or away from the first outer friction plate (43); the first piston (45) is connected to the outer wall of the input shaft (11) through the first elastic member (46); when the first piston (45) slides close to the first outer friction plate (43), it can push the first outer friction plate (43) or the first inner friction plate (44) so ​​that the first outer friction plate (43) and the first inner friction plate (44) are pressed against each other and the first elastic member (46) is compressed.

7. The transmission mechanism according to claim 6, characterized in that: The second clutch (6) further comprises a third friction plate, a fourth friction plate, a second piston (65) and a second elastic member (66); the third friction plate is slidably connected to the second outer hub (61) and can rotate synchronously with the second outer hub (61); the fourth friction plate is slidably connected to the second inner hub (62) and can rotate synchronously with the second inner hub (62); the third friction plate and the fourth friction plate can both slide along the axial direction of the input shaft (11); the third friction plate and the fourth friction plate at least partially overlap along the axial direction of the input shaft (11); The side of the mounting portion (1101) close to the second clutch (6) forms a second sliding cavity with the input shaft (11). The second piston (65) is slidably arranged in the second sliding cavity and can slide close to or away from the third friction plate. The second piston (65) is connected to the outer wall of the input shaft (11) through the second elastic member (66). When the second piston (65) slides close to the third friction plate, it can push the third friction plate or the fourth friction plate so that the third friction plate and the fourth friction plate are pressed against each other and the second elastic member (66) is compressed.

8. The transmission mechanism according to claim 7, characterized in that: The input shaft (11) is provided with a first control oil passage (112), a first channel (113), a second control oil passage (114) and a second channel (115); A first oil port (11011) is provided on the cavity wall of the first sliding cavity, the first oil port (11011) is located on a side of the first piston (45) away from the first outer friction plate (43), a first end of the first channel (113) is communicated with the first control oil channel (112), and a second end of the first channel (113) is communicated with the first oil port (11011); A second oil port (11012) is provided on the cavity wall of the second sliding cavity. The second oil port (11012) is located on the side of the second piston (65) away from the third friction plate. The first end of the second channel (115) is connected to the second control oil channel (114), and the second end of the second channel (115) is connected to the second oil port (11012).

9. The transmission mechanism according to claim 7, characterized in that: The input shaft (11) is provided with a lubricating oil passage (116), a third passage (117) and a fourth passage (119); A third oil port (118) is provided on the outer wall of the input shaft (11), the third oil port (118) is located on the side of the first piston (45) away from the second clutch (6), a first end of the third channel (117) is communicated with the lubricating oil channel (116), and a second end of the third channel (117) is communicated with the third oil port (118); A fourth oil port (1110) is provided on the outer wall of the input shaft (11), and the fourth oil port (1110) is located on the side of the second piston (65) away from the first clutch (4). The first end of the fourth channel (119) is connected to the lubricating oil channel (116), and the second end of the fourth channel (119) is connected to the fourth oil port (1110).

10. An engineering vehicle, characterized in that: It comprises the transmission mechanism described in any one of claims 1 to 9.

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