Transmission systems and construction machinery

Abstract

This utility model belongs to the field of engineering machinery technology, and discloses a transmission system and engineering machinery. The transmission system includes a travel motor, a first input shaft, a travel transmission assembly, a first output shaft, a PTO motor, a second input shaft, a PTO transmission assembly, a second output shaft, and a coupling assembly. The travel motor is connected to the first input shaft. The travel transmission assembly includes a first intermediate shaft, a first planetary gear set, a second planetary gear set, and a travel shifting mechanism. The first and second planetary gear sets are connected in series along the axial direction of the first intermediate shaft. The travel shifting mechanism is used to switch the power transmission path from the first intermediate shaft to the first output shaft. The PTO motor is connected to the second input shaft, and the second intermediate shaft is connected to the second output shaft via the PTO transmission assembly. The coupling assembly is used to selectively engage the travel motor and the PTO motor. When the coupling assembly engages the travel motor and the PTO motor, the power of the travel motor and the PTO motor is coupled, realizing power sharing and improving power utilization.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, and in particular to a transmission system and engineering machinery. Background Technology

[0002] Traditional tractor chassis transmission systems employ a mechanical multi-speed transmission architecture, typically consisting of a main transmission, auxiliary transmission, PTO transmission, and drive axle. To adapt to the complex working conditions and wide speed requirements in agricultural operations, the transmission system needs to be equipped with more than 20 gears, resulting in a cumbersome transmission structure. With the development of hybrid technology, electric drive systems have brought innovative opportunities to tractor transmissions. Existing hybrid solutions use a range extender + dual-motor architecture (the travel motor drives the mechanical transmission, and the PTO motor independently drives the power take-off shaft). By leveraging the wide-range speed regulation characteristics of the motors, the number of transmission gears is reduced to less than 5, significantly simplifying the transmission structure. However, this architecture still has shortcomings: the power of the travel motor and the PTO motor cannot be dynamically shared. When the tractor needs to perform both travel and PTO operations simultaneously (such as rotary tillage, harvesting, and other typical working conditions), the independent operation of the two motors doubles the system's peak power demand, while in actual operation, there is always power redundancy in a single motor, resulting in insufficient utilization of the power unit. Utility Model Content

[0003] The purpose of this utility model is to provide a transmission system and engineering machinery that can achieve power sharing and improve power utilization.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] The transmission system includes:

[0006] The system comprises a walking motor, a first input shaft, a walking transmission assembly, and a first output shaft. The walking motor is connected to the first input shaft. The walking transmission assembly includes a first intermediate shaft, a first planetary gear set, a second planetary gear set, and a walking shift mechanism. The first intermediate shaft is drivenly connected to the first input shaft. The first planetary gear set and the second planetary gear set are connected in series along the axial direction of the first intermediate shaft and along the power transmission direction. The first planetary gear set is located behind the second planetary gear set. The first sun gear in the first planetary gear set and the second sun gear in the second planetary gear set are both fixedly sleeved on the first intermediate shaft. The first planet carrier or the first ring gear in the first planetary gear set is drivenly connected to the first output shaft. The walking shift mechanism is used to switch the power transmission path from the first intermediate shaft to the first output shaft.

[0007] The system comprises a PTO motor, a second input shaft, a second intermediate shaft, a PTO speed change assembly, and a second output shaft. The PTO motor is connected to the second input shaft, the second input shaft is driven by the second intermediate shaft, and the second intermediate shaft is driven by the PTO speed change assembly to the second output shaft.

[0008] A coupling assembly for selectively engaging the walking motor and the PTO motor.

[0009] As a preferred technical solution for the transmission system, the first input shaft is connected to the first intermediate shaft via a first gear set. The first gear set includes a meshing first driving gear and a first driven gear. The first driving gear is fixedly sleeved on the first input shaft, and the first driven gear is fixedly sleeved on the first intermediate shaft.

[0010] The first planet carrier or the first ring gear in the first planetary set is connected to the first output shaft via a second gear set. The second gear set includes a second driving gear and a second driven gear that mesh with each other. The second driving gear is connected to the first planet carrier or the first ring gear, and the second driven gear is fixedly sleeved on the first output shaft.

[0011] As a preferred technical solution for the transmission system, the second input shaft is connected to the second intermediate shaft via a third gear set. The third gear set includes a third driving gear and a third driven gear that mesh with each other. The third driving gear is fixedly sleeved on the second input shaft, and the third driven gear is fixedly sleeved on the second intermediate shaft.

[0012] As a preferred technical solution for the transmission system, the coupling component includes a first coupling gear, a second coupling gear, and a coupling sleeve. The first coupling gear is fixedly sleeved on the second intermediate shaft, the second coupling gear is connected to the second driving gear, and the coupling sleeve can engage or disengage the first coupling gear and the second coupling gear.

[0013] As a preferred technical solution for the transmission system, the coupling component includes a first coupling gear, a second coupling gear, and a coupling sleeve. The first coupling gear is connected to the third driven gear, the second coupling gear is connected to the first driven gear, and the coupling sleeve can engage or disengage the first coupling gear and the second coupling gear.

[0014] As a preferred technical solution for the transmission system, the first planetary gear set and the second planetary gear set are connected in series such that the first gear ring is fixedly connected to the second planetary carrier, and the first planetary carrier is drivenly connected to the first output shaft of the second planetary gear set.

[0015] As a preferred technical solution for the transmission system, the traveling shifting mechanism includes a gear a and a sliding sleeve a. The gear a includes a zero gear a, a first gear a, a second gear a, and a third gear a. The zero gear a is fixedly installed. The first gear a is fixedly connected to the second planetary carrier. The second gear a is fixedly connected to the second ring gear of the second planetary gear set. The third gear a is drivenly connected to the first input shaft. The sliding sleeve a can control the engagement and disengagement of the zero gear a and the first gear a, the engagement and disengagement of the zero gear a and the second gear a, and the engagement and disengagement of the first gear a and the third gear a.

[0016] As a preferred technical solution for the transmission system, the zero gear a is a double-row gear, including two sub-zero gears a, one of which is located on the same side as the second gear a, and the other sub-zero gear a is located on the same side as the first gear a and the third gear a;

[0017] The sliding sleeve a includes a first sliding sleeve a and a second sliding sleeve a. The first sliding sleeve a can control the engagement and disengagement of one of the sub-zero gears a with the second gear a. The second sliding sleeve a can control the engagement and disengagement of the other sub-zero gear a with the first gear a, as well as the engagement and disengagement of the first gear a with the third gear a.

[0018] As a preferred technical solution for the transmission system, the first intermediate shaft is provided with an axially through central hole, and the second intermediate shaft passes through the central hole.

[0019] Construction machinery, including the transmission system described in any of the above embodiments.

[0020] The beneficial effects of this utility model are:

[0021] This utility model provides a transmission system including a coupling component. The coupling component can selectively engage a travel motor and a PTO motor. When the coupling component engages the travel motor and the PTO motor, the power of the travel motor and the PTO motor is coupled, realizing power sharing and improving power utilization. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the transmission system provided in one embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the transmission system provided in another embodiment of the present invention.

[0024] In the picture:

[0025] 11. Walking motor; 12. First input shaft; 13. First intermediate shaft; 141. First driving gear; 142. First driven gear; 151. First sun gear; 152. First planet gear; 153. First planet carrier; 154. First ring gear; 161. Second sun gear; 162. Second planet gear; 163. Second planet carrier; 164. Second ring gear; 171. Zero gear a; 172. First gear a; 173. Second gear a; 174. Third gear a; 175. First sliding sleeve a; 176. Second sliding sleeve a; 181. Second driving gear; 182. Second driven gear; 19. First output shaft;

[0026] 21. PTO motor; 22. Second input shaft; 23. Second intermediate shaft; 241. Third drive gear; 242. Third driven gear; 251. First PTO drive gear; 252. First PTO driven gear; 261. Second PTO drive gear; 262. Second PTO driven gear; 271. Zero gear b; 272. First gear b; 273. Second gear b; 274. Sliding sleeve b; 28. Second output shaft;

[0027] 31. First coupling gear; 32. Second coupling gear; 33. Coupling sleeve;

[0028] 41. Third output shaft; 42. Clutch; 431. Fourth driving gear; 432. Fourth driven gear. Detailed Implementation

[0029] 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, only the parts relevant to the present invention are shown in the drawings, not the entire structure.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] like Figure 1 and Figure 2 As shown, this utility model embodiment provides a transmission system, including a travel motor 11, a first input shaft 12, a travel transmission assembly, a first output shaft 19, a PTO motor 21, a second input shaft 22, a second intermediate shaft 23, a PTO transmission assembly, a second output shaft 28, and a coupling assembly. The travel motor 11 is connected to the first input shaft 12. The travel transmission assembly includes a first intermediate shaft 13, a first planetary gear set, a second planetary gear set, and a travel shifting mechanism. The first intermediate shaft 13 is drive-connected to the first input shaft 12. The first and second planetary gear sets are connected in series along the axial direction of the first intermediate shaft 13 and along the power transmission direction. The first planetary gear set is located at the [missing information - likely a specific location or position]. At the rear of the two planetary gear sets, the first sun gear 151 of the first planetary gear set and the second sun gear 161 of the second planetary gear set are both fixedly sleeved on the first intermediate shaft 13. The first planet carrier 153 or the first gear ring 154 of the first planetary gear set is drivenly connected to the first output shaft 19. The travel shifting mechanism is used to switch the power transmission path from the first intermediate shaft 13 to the first output shaft 19. The PTO motor 21 is connected to the second input shaft 22, the second input shaft 22 is drivenly connected to the second intermediate shaft 23, and the second intermediate shaft 23 is drivenly connected to the second output shaft 28 through the PTO transmission assembly. The coupling assembly is used to selectively engage the travel motor 11 and the PTO motor 21. When the coupling assembly engages the travel motor 11 and the PTO motor 21, the power of the travel motor 11 and the PTO motor 21 is coupled to achieve power sharing and improve power utilization. When the coupling assembly disconnects the travel motor 11 from the PTO motor, the power of the travel motor 11 and the PTO motor 21 is decoupled, and the travel system and the working device work independently.

[0034] In this embodiment, the first input shaft 12 is driven by the first intermediate shaft 13 via a first gear set. The first gear set includes a meshing first driving gear 141 and a first driven gear 142. The first driving gear 141 is fixedly sleeved on the first input shaft 12, and the first driven gear 142 is fixedly sleeved on the first intermediate shaft 13. The first planet carrier 153 or the first gear ring 154 in the first planetary gear set is driven by the first output shaft 19 via a second gear set. The second gear set includes a meshing second driving gear 181 and a second driven gear 182. The second driving gear 181 is connected to the first planet carrier 153 or the first gear ring 154, and the second driven gear 182 is fixedly sleeved on the first output shaft 19. The second input shaft 22 is driven by the second intermediate shaft 23 via a third gear set. The third gear set includes a meshing third driving gear 241 and a third driven gear 242. The third driving gear 241 is fixedly sleeved on the second input shaft 22, and the third driven gear 242 is fixedly sleeved on the second intermediate shaft 23. In other embodiments, the first input shaft 12 and the first intermediate shaft 13 can be connected by a coupling, the first planetary carrier 153 or the first gear can be directly connected to the first output shaft 19, and the second input shaft 22 and the second intermediate shaft 23 can be connected by a coupling.

[0035] In this embodiment, the first intermediate shaft 13 is provided with an axially through central hole, and the second intermediate shaft 23 passes through the central hole, making the overall structure distribution more reasonable.

[0036] In some embodiments, refer to Figure 1 The coupling assembly includes a first coupling gear 31, a second coupling gear 32, and a coupling sleeve 33. The first coupling gear 31 is fixedly sleeved on the second intermediate shaft 23, and the second coupling gear 32 is connected to the second drive gear 181. The coupling sleeve 33 can engage or disengage the first coupling gear 31 and the second coupling gear 32. When the coupling sleeve 33 engages the first coupling gear 31 and the second coupling gear 32, the power of the PTO motor 21 can be directly transmitted to the first output shaft 19 via the third gear set, the second intermediate shaft 23, the first coupling gear 31, the second coupling gear 32, and the second gear set. This can achieve power compensation for the travel motor 11 when the travel transmission assembly shifts gears, ensuring that the shifting power is not interrupted.

[0037] In other embodiments, reference is made to Figure 2The first coupling gear 31 can also be connected to the third driven gear 242, and the second coupling gear 32 is connected to the first driven gear 142. The coupling sleeve 33 can engage or disengage the first coupling gear 31 and the second coupling gear 32. When the coupling sleeve 33 engages the first coupling gear 31 and the second coupling gear 32, the power of the PTO motor 21 and the travel motor 11 is transmitted backward together after being coupled by the first driven gear 142. This method can only achieve power coupling between the PTO motor 21 and the travel motor 11, but it does not have the function of uninterrupted power during gear shifting.

[0038] In this embodiment, the first planetary gear set and the second planetary gear set are connected in series such that the first gear ring 154 is fixedly connected to the second planetary carrier 163, and the first planetary carrier 153 is connected to the second driving gear 181. The travel shifting mechanism includes a gear a and a sliding sleeve a. The gear a includes a zero gear a171, a first gear a172, a second gear a173, and a third gear a174. The zero gear a171 is fixedly installed, the first gear a172 is fixedly connected to the second planetary carrier 163, the second gear a173 is fixedly connected to the second gear ring 164, and the third gear a174 is connected to the first driven gear 142.

[0039] The sliding sleeve a controls the engagement and disengagement of the zero gear a171 with the first gear a172, the zero gear a171 with the second gear a173, and the first gear a172 with the third gear a174. In this embodiment, the zero gear a171 is a double-row gear, including two sub-zero gears a. One sub-zero gear a is located on the same side as the second gear a173, and the other sub-zero gear a is located on the same side as the first gear a172 and the third gear a174. The sliding sleeve a includes a first sliding sleeve a175 and a second sliding sleeve a176. The first sliding sleeve a175 controls the engagement and disengagement of one sub-zero gear a with the second gear a173, and the second sliding sleeve a176 controls the engagement and disengagement of the other sub-zero gear a with the first gear a172, and the first gear a172 with the third gear a174.

[0040] When the travel transmission assembly needs to be switched to first gear, the control sleeve a176 engages the zero gear a171 and the first gear a172. At this time, the power transmission route is as follows: the power of the travel motor 11 is transmitted to the first output shaft 19 via the first driving gear 141, the first driven gear 142, the first intermediate shaft 13, the first sun gear 151, the first planetary gear 152 and the first planetary carrier 153, the second driving gear 181 and the second driven gear 182. When the main travel transmission needs to be switched to second gear, the second sliding sleeve a176 is controlled to disconnect the zero gear a171 from the first gear a172, and the second sliding sleeve a176 is returned to the empty position of the first gear a172. Then, the first sliding sleeve a175 is controlled to engage the second gear a173 with the zero gear a171. At this time, the power transmission route is as follows: the power of the travel motor 11 is divided into two paths after passing through the first driving gear 141, the first driven gear 142 and the first intermediate shaft 13. One path is transmitted to the first planetary carrier 153 through the second sun gear 161, the second planetary gear 162, the second planetary carrier 163, the first gear ring 154 and the first planetary gear 152. The other path is transmitted to the first planetary carrier 153 through the first sun gear 151 and the first planetary gear 152. The two paths converge in the first planetary carrier 153 and are then transmitted to the first output shaft 19 through the second driving gear 181 and the second driven gear 182. When the main travel transmission component needs to be switched to third gear, the first sliding sleeve a175 is controlled to disconnect the zero gear a171 from the second gear a173 and return the first sliding sleeve a175 to the empty position of the second gear a173. Then, the second sliding sleeve a176 is controlled to engage the third gear a174 with the first gear a172. At this time, the power transmission route is as follows: the power of the travel motor 11 is transmitted to the first output shaft 19 through the first driving gear 141, the first driven gear 142, the first intermediate shaft 13, the second driving gear 181 and the second driven gear 182.

[0041] In other embodiments, the first and second planetary gear sets can be connected in series such that the first planetary carrier 153 is fixedly connected to the second ring gear 164, and the first ring gear 154 is connected to the second drive gear 181. In this series configuration, the zero gear a171 is fixedly mounted on the gearbox housing, the first gear a172 is fixedly connected to the second ring gear 164, the second gear a173 is fixedly connected to the second planetary carrier 163, and the third gear a174 is fixedly mounted on the first input shaft 12. The difference between these two series configurations lies in the output transmission ratio; the first configuration has a higher output transmission ratio than the second configuration, and the specific configuration can be selected according to needs.

[0042] In this embodiment, the first output shaft 19 is connected to the rear axle. The transmission system also includes a third output shaft 41 and a fourth gear set. The third output shaft 41 is connected to the front axle, and the fourth gear set includes a meshing fourth driving gear 431 and a fourth driven gear 432. The fourth driving gear 431 is sleeved on the first output shaft 19, and the clutch 42 can control the engagement and disengagement of the fourth driving gear 431 from the first output shaft 19. The fourth driven gear 432 is fixedly sleeved on the third output shaft 41. When the clutch 42 engages the fourth driving gear 431 with the first output shaft 19, the power of the first output shaft 19 is transmitted to both the front and rear axles simultaneously; when the clutch 42 disengages the fourth driving gear 431 from the first output shaft 19, the power of the first output shaft 19 is transmitted only to the rear axle.

[0043] In this embodiment, the PTO transmission assembly includes a first PTO gear set, a second PTO gear set, and a PTO shifting mechanism. The first PTO gear set includes a meshing first PTO drive gear 251 and a first PTO driven gear 252. The first PTO drive gear 251 is loosely fitted on the second intermediate shaft 23, and the first PTO driven gear 252 is fixedly mounted on the second output shaft 28. The second PTO gear set includes a meshing second PTO drive gear 261 and a second PTO driven gear 262. The second PTO drive gear 261 is loosely fitted on the second intermediate shaft 23, and the second PTO driven gear 262 is fixedly mounted on the second output shaft 28. The PTO shifting mechanism is used to control the power of the second intermediate shaft 23 to be transmitted to the second output shaft 28 via the first PTO gear set or the second PTO gear set. Furthermore, the PTO shifting mechanism includes a zero gear b271, a first gear b272, a second gear b273, and a sliding sleeve b274. The zero gear b271 is fixedly mounted on the second intermediate shaft 23. The first gear b272 and the second gear b273 are both loosely fitted on the second intermediate shaft 23. The first gear b272 is connected to the first PTO drive gear 251, and the second gear b273 is connected to the second PTO drive gear 261. The sliding sleeve b274 is used to control the zero gear b271 to selectively engage with the first gear b272 or the second gear b273. When the sliding sleeve b274 engages the zero gear b271 with the first gear b272, the PTO transmission assembly is in first gear. The power of the PTO motor 21 is transmitted to the second output shaft 28 via the second input shaft 22, the third gear set, the second intermediate shaft 23, and the first PTO gear set. When the sliding sleeve b274 engages the zero gear b271 with the second gear b273, the PTO transmission assembly is in second gear. The power of the PTO motor 21 is transmitted to the second output shaft 28 via the second input shaft 22, the third gear set, the second intermediate shaft 23, and the second PTO gear set.

[0044] This utility model embodiment also provides an engineering machinery, including the above-described transmission system. In this embodiment, the engineering machinery is a tractor.

[0045] 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 transmission system characterised in that, include: The system includes a walking motor (11), a first input shaft (12), a walking transmission assembly, and a first output shaft (19). The walking motor (11) is connected to the first input shaft (12). The walking transmission assembly includes a first intermediate shaft (13), a first planetary gear set, a second planetary gear set, and a walking shift mechanism. The first intermediate shaft (13) is connected to the first input shaft (12). The first planetary gear set and the second planetary gear set are connected in series along the axial direction of the first intermediate shaft (13) and along the power transmission direction. The first planetary gear set is located behind the second planetary gear set. The first sun gear (151) in the first planetary gear set and the second sun gear (161) in the second planetary gear set are both fixedly sleeved on the first intermediate shaft (13). The first planet carrier (153) or the first gear ring (154) in the first planetary gear set is connected to the first output shaft (19). The walking shift mechanism is used to switch the power transmission path from the first intermediate shaft (13) to the first output shaft (19). The PTO motor (21), the second input shaft (22), the second intermediate shaft (23), the PTO speed change assembly, and the second output shaft (28) are connected. The PTO motor (21) is connected to the second input shaft (22), the second input shaft (22) is connected to the second intermediate shaft (23) via a transmission, and the second intermediate shaft (23) is connected to the second output shaft (28) via the PTO speed change assembly. A coupling assembly for selectively engaging the walking motor (11) and the PTO motor (21).

2. The transmission system of claim 1, wherein, The first input shaft (12) is connected to the first intermediate shaft (13) via a first gear set. The first gear set includes a meshing first driving gear (141) and a first driven gear (142). The first driving gear (141) is fixedly sleeved on the first input shaft (12), and the first driven gear (142) is fixedly sleeved on the first intermediate shaft (13). The first planet carrier (153) or the first gear ring (154) in the first planetary set is connected to the first output shaft (19) via a second gear set. The second gear set includes a second driving gear (181) and a second driven gear (182) meshing with each other. The second driving gear (181) is connected to the first planet carrier (153) or the first gear ring (154), and the second driven gear (182) is fixedly sleeved on the first output shaft (19).

3. The transmission system of claim 2, wherein, The second input shaft (22) is connected to the second intermediate shaft (23) via a third gear set. The third gear set includes a third driving gear (241) and a third driven gear (242) that mesh with each other. The third driving gear (241) is fixedly sleeved on the second input shaft (22), and the third driven gear (242) is fixedly sleeved on the second intermediate shaft (23).

4. The transmission system of claim 2, wherein, The coupling assembly includes a first coupling gear (31), a second coupling gear (32), and a coupling sleeve (33). The first coupling gear (31) is fixedly sleeved on the second intermediate shaft (23). The second coupling gear (32) is connected to the second driving gear (181). The coupling sleeve (33) can engage or disengage the first coupling gear (31) and the second coupling gear (32).

5. The transmission system according to claim 3, characterized in that, The coupling assembly includes a first coupling gear (31), a second coupling gear (32), and a coupling sleeve (33). The first coupling gear (31) is connected to the third driven gear (242), the second coupling gear (32) is connected to the first driven gear (142), and the coupling sleeve (33) can engage or disengage the first coupling gear (31) and the second coupling gear (32).

6. A transmission system according to any one of claims 1 to 5, characterised in that, The first planetary gear set and the second planetary gear set are connected in series such that the first gear ring (154) is fixedly connected to the second planetary carrier (163) of the second planetary gear set, and the first planetary carrier (153) is drivenly connected to the first output shaft (19).

7. The transmission system of claim 6, wherein, The traveling gear shifting mechanism includes a gear a and a sliding sleeve a. The gear a includes a zero gear a (171), a first gear a (172), a second gear a (173), and a third gear a (174). The zero gear a (171) is fixedly installed. The first gear a (172) is fixedly connected to the second planetary carrier (163). The second gear a (173) is fixedly connected to the second gear ring (164) of the second planetary carrier. The third gear a (174) is drivenly connected to the first input shaft (12). The sliding sleeve a can control the engagement and disengagement of the zero gear a (171) and the first gear a (172), the engagement and disengagement of the zero gear a (171) and the second gear a (173), and the engagement and disengagement of the first gear a (172) and the third gear a (174).

8. The transmission system of claim 7, wherein, The zero gear a (171) is a double-row gear, including two sub-zero gears a, one of which is located on the same side as the second gear a (173), and the other is located on the same side as the first gear a (172) and the third gear a (174); The sliding sleeve a includes a first sliding sleeve a (175) and a second sliding sleeve a (176). The first sliding sleeve a (175) can control the engagement and disengagement of one of the sub-zero gears a with the second gear a (173). The second sliding sleeve a (176) can control the engagement and disengagement of the other sub-zero gear a with the first gear a (172), and the engagement and disengagement of the first gear a (172) with the third gear a (174).

9. A transmission system according to any one of claims 1 to 5, characterised in that, The first intermediate shaft (13) is provided with an axially through central hole, and the second intermediate shaft (23) passes through the central hole.

10. A working machine, characterised in that Includes the transmission system as described in any one of claims 1-9.

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