Transmission, drive system and construction machinery

Abstract

The present disclosure provides a transmission, a transmission system, and a construction machine. The transmission includes: a housing; an input shaft; a plurality of input gear trains, the input shaft being drivingly connected to an input sun gear; a plurality of input clutches configured to connect or disconnect the housing from corresponding input ring gears; a first output shaft; an output gear train, a first output sun gear being drivingly connected to the first output shaft, a first output ring gear being drivingly connected to a second output sun gear, a second output planet gear being connected to a first planet carrier, and the first planet carrier being drivingly connected to the first output shaft; a second planet carrier, the input ring gear being rotatably provided synchronously with the second planet carrier or an input planet gear being connected to the second planet carrier, and the first output planet gear being connected to the second planet carrier; a connection hub drivingly connected to the first output shaft; a first output clutch configured to connect or disconnect the first output ring gear from the connection hub; and a second output clutch configured to connect or disconnect the housing from the second output planet gear.

Description

Technical Field

[0001] The present disclosure relates to the field of construction machinery transmissions, and particularly to a gearbox, a transmission system, and a construction machinery. Background Art

[0002] Currently, while engineering hydro-mechanical vehicles meet the requirements of heavy-duty operations, the mobility requirements of the whole vehicle are also getting higher and higher, and a gearbox with a wide speed ratio range is required. Among them, the low-speed gear can meet the requirements of the whole machine for heavy loads, maximizing the torque under operating conditions; the high-speed gear meets the mobility requirements and improves the rapid response of the whole machine.

[0003] However, in the related technologies known to the inventors, the speed ratio range of the power shift gearbox of engineering hydro-mechanical machines is relatively narrow (≤8), and it is difficult to simultaneously meet the requirements of the vehicle's earthmoving, loading, obstacle-crossing and climbing capabilities, and fast driving capabilities. In order to simultaneously meet the requirements of heavy loads and high mobility, a high-low gear is often added on the basis of the output shaft of the original gearbox. When switching between high and low speeds, it is necessary to stop and shift gears, and automatic shifting between high and low speeds cannot be achieved, increasing the difficulty of operation for the driver. And sometimes, in order to achieve a wide speed ratio, only the speed ratio step can be increased. However, due to the small number of gears, a large speed ratio step will result in a large shifting impact. Moreover, since the total sliding friction work of the clutch during shifting is proportional to the square of the speed ratio step, it will also increase the thermal load of the clutch in the power shift gearbox, affecting the reliability of the whole box. Summary of the Invention

[0004] The purpose of the present disclosure is to provide a gearbox with a wide speed ratio and multiple gears, as well as a transmission system and a construction machinery including the gearbox.

[0005] The first aspect of the present disclosure provides a gearbox, characterized in that it includes:

[0006] A housing;

[0007] An input shaft, mounted on the housing;

[0008] A plurality of input gear trains arranged in parallel, each input gear train including an input sun gear, an input planet gear, and an input ring gear that are sequentially meshed, and the input shaft is drivingly connected to the input sun gear;

[0009] A plurality of input clutches, correspondingly arranged with the plurality of input ring gears, and configured to connect or disconnect the housing from the corresponding input ring gear;

[0010] A first output shaft, mounted on the housing;

[0011] The output gear train includes a first output sun gear, a first output planet gear, a first output ring gear, a second output sun gear, a second output planet gear, a second output ring gear, and a first planet carrier. The first output sun gear is in transmission connection with the first output shaft. The first output sun gear, the first output planet gear, and the first output ring gear are sequentially meshed. The first output ring gear is in transmission connection with the second output sun gear. The second output sun gear, the second output planet gear, and the second output ring gear are sequentially meshed. The second output planet gear is rotatably connected to the first planet carrier about its own axis. The first planet carrier is in transmission connection with the first output shaft;

[0012] A second planet carrier, the input ring gear is arranged to be rotatable synchronously with the second planet carrier or the input planet gear is rotatably connected to the second planet carrier about its own axis, and the first output planet gear is rotatably connected to the second planet carrier about its own axis;

[0013] A connecting hub, in transmission connection with the first output shaft;

[0014] A first output clutch, configured to connect or disconnect the first output ring gear and the connecting hub; and

[0015] A second output clutch, configured to connect or disconnect the housing and the second output planet gear.

[0016] According to some embodiments of the present disclosure,

[0017] The plurality of input gear trains include a first input gear train and a second input gear train. The first input gear train includes a first input sun gear, a first input planet gear, and a first input ring gear that are sequentially meshed. The input shaft is in transmission connection with the first input sun gear. The first input planet gear is rotatably connected to the second planet carrier about its own axis. The second input gear train includes a second input sun gear, a second input planet gear, and a second input ring gear that are sequentially meshed. The input shaft is in transmission connection with the second input sun gear. The second input planet gear is rotatably connected to the second planet carrier about its own axis;

[0018] The plurality of input clutches include a first input clutch and a second input clutch. The first input clutch is configured to connect or disconnect the housing and the first input ring gear. The second input clutch is configured to connect or disconnect the housing and the second input ring gear.

[0019] According to some embodiments of the present disclosure, the transmission has a first gear position, a second gear position, a third gear position, and a fourth gear position, wherein,

[0020] In the first gear position, the housing is connected to the first input gear ring, the housing is disengaged from the second input gear ring, the first output gear ring is disengaged from the connecting hub, and the housing is connected to the second output planet gear;

[0021] In the second gear position, the housing is disengaged from the first input gear ring, the housing is connected to the second input gear ring, the first output gear ring is disengaged from the connecting hub, and the housing is connected to the second output planet gear;

[0022] In the third gear position, the housing is connected to the first input gear ring, the housing is disengaged from the second input gear ring, the first output gear ring is connected to the connecting hub, and the housing is disengaged from the second output planet gear;

[0023] In the fourth gear position, the housing is disengaged from the first input gear ring, the housing is connected to the second input gear ring, the first output gear ring is connected to the connecting hub, and the housing is disengaged from the second output planet gear.

[0024] According to some embodiments of the present disclosure, a third output clutch is further included, and the third output clutch is configured to connect or disconnect the housing from the first output gear ring.

[0025] According to some embodiments of the present disclosure, the transmission has a fifth gear position and a sixth gear position, wherein,

[0026] In the fifth gear position, the housing is connected to the first input gear ring, the housing is disengaged from the second input gear ring, the first output gear ring is disengaged from the connecting hub, the housing is disengaged from the second output planet gear, and the housing is connected to the first output gear ring;

[0027] In the sixth gear position, the housing is disengaged from the first input gear ring, the housing is connected to the second input gear ring, the first output gear ring is disengaged from the connecting hub, the housing is disengaged from the second output planet gear, and the housing is connected to the first output gear ring.

[0028] According to some embodiments of the present disclosure,

[0029] The plurality of input gear trains includes a third input gear train, the third input gear train includes a third input sun gear, a third input planet gear, and a third input gear ring that are sequentially meshed, the input shaft is drivingly connected to the third input sun gear, and the third input gear ring is rotatably disposed coaxially with the second planet carrier;

[0030] The transmission further includes a third planet carrier and a third input clutch. The third input planet gear is rotatably connected to the third planet carrier about its own axis. The third input clutch is configured to connect or disconnect the housing and the third planet carrier.

[0031] According to some embodiments of the present disclosure, the transmission has a seventh gear and an eighth gear, wherein,

[0032] In the seventh gear, the first output ring gear is disengaged from the connection hub, the housing is connected to the second output planet gear, and the housing and the third planet carrier are connected;

[0033] In the eighth gear, the first output ring gear is connected to the connection hub, the housing is disengaged from the second output planet gear, and the housing and the third planet carrier are connected.

[0034] According to some embodiments of the present disclosure, it further includes:

[0035] A first output gear coaxially and fixedly connected to the first output shaft;

[0036] At least one intermediate shaft mounted on the housing;

[0037] At least one intermediate gear correspondingly arranged with at least one of the intermediate shafts and coaxially and fixedly connected to the corresponding intermediate shaft;

[0038] A second output shaft mounted on the housing; and

[0039] A second output gear coaxially and fixedly connected to the second output shaft;

[0040] Wherein, the first output gear, at least one of the intermediate gears, and the second output gear are meshed in sequence.

[0041] According to some embodiments of the present disclosure, the axis of the first output shaft does not coincide with the axis of the second output shaft.

[0042] According to some embodiments of the present disclosure,

[0043] The input shaft is coaxially and fixedly connected to the input sun gear; and / or

[0044] At least one of the first output sun gear, the connection hub, and the first planet carrier is coaxially and fixedly connected to the first output shaft; and / or

[0045] The first output ring gear is fixedly connected to the second output sun gear.

[0046] A second aspect of the present disclosure provides a transmission system, including:

[0047] The transmission according to the first aspect of the present disclosure; and

[0048] A torque converter configured to provide power to the input shaft.

[0049] The third aspect of the present disclosure provides a construction machine, including the transmission according to the first aspect of the present disclosure, or including the transmission system according to the second aspect of the present disclosure.

[0050] The transmission provided by the embodiments of the present disclosure includes a plurality of input clutches for switching the working states of a plurality of input gear trains, a first output clutch and a second output clutch for switching the working states of the output gear train. By changing the engagement states of different clutches, the input shaft can input power through different input gear trains, and the input power can be directly output to the first output shaft or output to the first output shaft after being split by the first output sun gear and the first planetary carrier, thereby forming a relatively large number of gears and a relatively wide speed ratio range (which can exceed 10). The speed ratio step of the transmission is relatively low, and the transmission can achieve power shifting and automatic shifting by controlling the clutch actions without stopping for shifting. The above settings can not only reduce the thermal load of the clutch and improve the service life of the transmission, but also reduce the shifting shock and improve the shifting smoothness, thereby improving the comfort of the whole machine.

[0051] Moreover, the transmission provided by the embodiments of the present disclosure is a planetary gear transmission. On the basis of achieving a wide speed ratio and a large number of gears, it has a compact structure, a small volume, a high load-bearing capacity, and a large output torque, and can meet the requirements of heavy-duty operation and fast driving of construction machines in a compact space.

[0052] Other features and advantages of the present disclosure will become clear from the following detailed description of the exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The accompanying drawings described herein are used to provide a further understanding of the present disclosure, and constitute a part of this application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation to the present disclosure. In the drawings:

[0054] Figure 1 is a schematic structural diagram of the transmission and the transmission system of some embodiments of the present disclosure.

[0055] In the figure, each reference numeral represents respectively:

[0056] 1. Input shaft;

[0057] 211. First input sun gear; 212. First input planet gear; 213. First input ring gear; 221. Second input sun gear; 222. Second input planet gear; 223. Second input ring gear; 231. Third input sun gear; 232. Third input planet gear; 233. Third input ring gear;

[0058] 311. First output sun gear; 312. First output planet gear; 313. First output ring gear; 321. Second output sun gear; 322. Second output planet gear; 323. Second output ring gear;

[0059] 41. First input clutch; 42. Second input clutch; 43. First output clutch; 44. Second output clutch; 45. Third output clutch; 46. Third input clutch;

[0060] 51. First planet carrier; 52. Second planet carrier; 53. Third planet carrier;

[0061] 6. Connecting hub;

[0062] 71. First output shaft; 72. Intermediate shaft; 73. Second output shaft; 74. First output gear; 75. Intermediate gear; 76. Second output gear;

[0063] 8. Housing;

[0064] 9. Torque converter. Detailed implementation manners

[0065] Next, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present disclosure.

[0066] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present disclosure. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, these technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof in subsequent drawings is not required.

[0067] In the description of the present disclosure, it should be understood that the use of terms such as "first" and "second" to define components is merely for the convenience of distinguishing the corresponding components. Without further statement, the above terms have no special meaning, and thus cannot be construed as limiting the scope of protection of the present disclosure.

[0068] In the description of the present disclosure, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are merely for the convenience of describing the present disclosure and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the scope of protection of the present disclosure; the terms "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0069] Some embodiments of the present disclosure provide a transmission, including a housing 8, an input shaft 1, a plurality of input gear trains arranged in parallel, a plurality of input clutches, a first output shaft 71, an output gear train, a second planet carrier 52, a connection hub 6, a first output clutch 43, and a second output clutch 44.

[0070] The input shaft 1 is mounted on the housing 8.

[0071] Each input gear train includes an input sun gear, an input planet gear, and an input ring gear that are sequentially meshed, and the input shaft 1 is drivingly connected to the input sun gear.

[0072] The plurality of input clutches are correspondingly arranged with the plurality of input ring gears and are configured to connect or disconnect the housing 8 from the corresponding input ring gears.

[0073] The first output shaft 71 is mounted on the housing 8.

[0074] The output gear train includes a first output sun gear 311, a first output planet gear 312, a first output ring gear 313, a second output sun gear 321, a second output planet gear 322, a second output ring gear 323 and a first planet carrier 51. The first output sun gear 311 is drivingly connected to a first output shaft 71. The first output sun gear 311, the first output planet gear 312 and the first output ring gear 313 are meshed in sequence. The first output ring gear 313 is drivingly connected to the second output sun gear 321. The second output sun gear 321, the second output planet gear 322 and the second output ring gear 323 are meshed in sequence. The second output planet gear 322 is rotatably connected to the first planet carrier 51 about its own axis. The first planet carrier 51 is drivingly connected to the first output shaft 71.

[0075] The input ring gear and the second planet carrier 52 are arranged to rotate synchronously, or the input planet gear is rotatably connected to the second planet carrier 52 about its own axis. The first output planet gear 312 is rotatably connected to the second planet carrier 52 about its own axis.

[0076] The connecting hub 6 is drivingly connected to the first output shaft 71.

[0077] The first output clutch 43 is configured to connect or disconnect the first output ring gear 313 from the connecting hub 6.

[0078] The second output clutch 44 is configured to connect or disconnect the housing 8 from the second output planet gear 322.

[0079] Figure 1 In the illustrated embodiment, a part of the input clutch is connected to the housing 8, and the other part is connected to the corresponding input ring gear; a part of the first output clutch 43 is connected to the first output ring gear 313, and the other part is connected to the connecting hub 6; a part of the second output clutch 44 is connected to the housing 8, and the other part is connected to the second output planet gear 322. The multiple input clutches, the first output clutch 43 and the second output clutch 44 mentioned above can be friction clutches.

[0080] The transmission provided by the embodiments of the present disclosure includes a plurality of input clutches for switching the operating states of a plurality of input gear trains, a first output clutch and a second output clutch for switching the operating state of the output gear train. By changing the engagement states of different clutches, the input shaft can input power through different input gear trains, and the input power can be directly output to the first output shaft or output to the first output shaft after being split by the first output sun gear and the first planetary carrier, thereby forming more gears and a wider speed ratio range (which can exceed 10). The speed ratio step of the transmission is low, and the transmission can achieve power shifting and automatic shifting by controlling the clutch action without stopping for shifting. The above settings can not only reduce the thermal load of the clutch and improve the service life of the transmission, but also reduce the shifting shock and improve the shifting smoothness, thereby improving the overall comfort of the machine.

[0081] Moreover, the transmission provided by the embodiments of the present disclosure is a planetary gear transmission. On the basis of achieving a wide speed ratio and multiple gears, it has a compact structure, a small volume, a high load-bearing capacity, and a large output torque, and can meet the requirements of heavy-duty operation and fast driving of construction machinery in a compact space.

[0082] In some embodiments, the transmission is configured as at least one of the following:

[0083] The input shaft 1 is coaxially and fixedly connected to the input sun gear, so that the input sun gear can rotate synchronously with the input shaft 1;

[0084] At least one of the first output sun gear 311, the connecting hub 6, and the first planetary carrier 51 is coaxially and fixedly connected to the first output shaft 71, so that at least one of the first output sun gear 311, the connecting hub 6, and the first planetary carrier 51 can drive the first output shaft 71 to rotate synchronously;

[0085] The first output ring gear 313 is fixedly connected to the second output sun gear 321, so that the first output ring gear 313 and the second output sun gear 321 can rotate synchronously.

[0086] In the above embodiments, in order to enhance the load-bearing capacity of the transmission, a spline connection can be adopted between the plurality of input sun gears and the input shaft 1, and a spline connection can be adopted between the first output sun gear 311, the connecting hub 6, the first planetary carrier 51 and the output shaft.

[0087] In some embodiments, such as Figure 1As shown, the multiple input gear trains include a first input gear train and a second input gear train. The first input gear train includes a first input sun gear 211, a first input planet gear 212, and a first input ring gear 213 that are sequentially meshed. The input shaft 1 is drivingly connected to the first input sun gear 211. The first input planet gear 212 is rotatably connected to the second planet carrier 52 about its own axis. The second input gear train includes a second input sun gear 221, a second input planet gear 222, and a second input ring gear 223 that are sequentially meshed. The input shaft 1 is drivingly connected to the second input sun gear 221. The second input planet gear 222 is rotatably connected to the second planet carrier 52 about its own axis. The multiple input clutches include a first input clutch 41 and a second input clutch 42. The first input clutch 41 is configured to connect or disconnect the housing 8 from the first input ring gear 213. The second input clutch 42 is configured to connect or disconnect the housing 8 from the second input ring gear 223.

[0088] In some embodiments, as Figure 1 shown, the transmission has a first gear position, a second gear position, a third gear position, and a fourth gear position.

[0089] In the first gear position, the housing 8 is connected to the first input ring gear 213, the housing 8 is disconnected from the second input ring gear 223, the first output ring gear 313 is disconnected from the connecting hub 6, and the housing 8 is connected to the second output planet gear 322.

[0090] The power transmission process of the transmission in the first gear position is as follows:

[0091] The first input clutch 41 connects the housing 8 to the first input gear ring 213, and the second output clutch 44 connects the housing 8 to the second output planet gear 322. The first input gear ring 213 is fixed relative to the housing 8. The input shaft 1 rotates, causing the first input sun gear 211 to drive the first input planet gear 212 to rotate within the first input gear ring 213. The second planet carrier 52 rotates in the same direction as the input shaft 1. The rotating second planet carrier 52 drives the first output gear ring 313, the first output planet gear 312, and the first output sun gear 311 to rotate together. The first output gear ring 313 and the second output sun gear 321 can rotate synchronously. The second output sun gear 321 meshes with the second output planet gear 322. Therefore, the rotation of the second planet carrier 52 is transmitted to the second output planet gear 322 through the first output gear ring 313 and the second output sun gear 321. The second output gear ring 323 is fixed relative to the housing 8. The rotation of the second output planet gear 322 causes the first planet carrier 51 and the second planet carrier 52 to rotate together in the same direction. The power from the second planet carrier 52 is transmitted in two paths. One path is transmitted from the first output planet gear 312, the first output gear ring 313, the second output sun gear 321, the second output planet gear 322, and the first planet carrier 51 to the first output shaft 71, and the torque direction is the same as the rotation direction of the second planet carrier 52. The other path is transmitted from the first output planet gear 312 and the first output sun gear 311 to the first output shaft 71, and the torque direction is the same as the rotation direction of the second planet carrier 52. The combined power is output by the first output shaft 71, and the rotation direction of the first output shaft 71 is the same as the rotation direction of the input shaft 1.

[0092] In the second gear position, the housing 8 is disengaged from the first input gear ring 213, the housing 8 is connected to the second input gear ring 223, the first output gear ring 313 is disengaged from the connecting hub 6, and the housing 8 is connected to the second output planet gear 322.

[0093] The power transmission process of the transmission in the second gear position is as follows:

[0094] The second input clutch 42 connects the housing 8 to the second input gear ring 223, and the second output clutch 44 connects the housing 8 to the second output planet gear 322. The second input gear ring 223 is fixed relative to the housing 8. The input shaft 1 drives the second input sun gear 221 to rotate. The second input planet gear 222 rotates within the second input gear ring 223, causing the second planet carrier 52 to rotate in the same direction as the input shaft 1. Then, the power is transmitted in two paths in the same way as in the first gear position, and then combined to the first output shaft 71. The rotation direction of the first output shaft 71 is the same as the rotation direction of the input shaft 1.

[0095] In the third gear position, the housing 8 is connected to the first input gear ring 213, the housing 8 is disengaged from the second input gear ring 223, the first output gear ring 313 is connected to the connecting hub 6, and the housing 8 is disengaged from the second output planet gear 322.

[0096] The power transmission process of the transmission in the third gear is as follows:

[0097] The first input clutch 41 connects the housing 8 with the first input gear ring 213, and the first output clutch 43 connects the first output gear ring 313 with the connecting hub 6. The first input gear ring 213 remains fixed relative to the housing 8. The input shaft 1 drives the first input sun gear 211 and the first input planet gear 212 to rotate. The rotation of the first input planet gear 212 causes the second planet carrier 52 to rotate in the same direction as the first input sun gear 211. The rotation of the second planet carrier 52 causes the first output planet gear 312 to rotate. The rotation of the first output planet gear 312 causes both the first output gear ring 313 and the first output sun gear 311 to rotate. Thus, the power is divided into two paths. One path is transmitted through the first output sun gear 311 to the first output shaft 71. The first output gear ring 313 is connected to the connecting hub 6, and the first output gear ring 313 rotates synchronously with the connecting hub 6. The other path of power is transmitted from the connecting hub 6 to the first output shaft 71. Then, the two paths of power converge and are output by the first output shaft 71. The rotation direction of the first output shaft 71 is the same as that of the input shaft 1.

[0098] In the fourth gear, the housing 8 is disengaged from the first input gear ring 213, the housing 8 is connected to the second input gear ring 223, the first output gear ring 313 is connected to the connecting hub 6, and the housing 8 is disengaged from the second output planet gear 322.

[0099] The power transmission process of the transmission in the fourth gear is as follows:

[0100] The second input clutch 42 connects the housing 8 with the second input gear ring 223, and the first output clutch 43 connects the first output gear ring 313 with the connecting hub 6. The second input gear ring 223 remains fixed relative to the housing 8. The input shaft 1 drives the second input sun gear 221 to rotate, causing the second planet carrier 52 to rotate in the same direction as the input shaft 1. The rotation of the second planet carrier 52 causes the power to be divided into two paths and transmitted in the same way as in the third gear, and then converge and are output by the first output shaft 71. The rotation direction of the first output shaft 71 is the same as that of the input shaft 1.

[0101] In some embodiments, as Figure 1 shown, the transmission further includes a third output clutch 45, and the third output clutch 45 is configured to connect or disengage the housing 8 from the first output gear ring 313.

[0102] In some embodiments, as Figure 1 shown, the transmission has a fifth gear and a sixth gear.

[0103] In the fifth gear position, the housing 8 is connected to the first input gear ring 213, the housing 8 is disengaged from the second input gear ring 223, the first output gear ring 313 is disengaged from the connecting hub 6, the housing 8 is disengaged from the second output planet gear 322, and the housing 8 is connected to the first output gear ring 313.

[0104] The power transmission process of the transmission in the fifth gear position is as follows:

[0105] The first input clutch 41 connects the housing 8 to the first input gear ring 213, and the third output clutch 45 connects the housing 8 to the first output gear ring 313. The input shaft 1 drives the first input sun gear 211 to rotate. The first input gear ring 213 remains fixed relative to the housing 8. The rotation of the first input planet gear 212 causes the second planet carrier 52 to rotate. The power is output from the second planet carrier 52. The first output gear ring 313 remains fixed relative to the housing 8. The power is transmitted to the first output shaft 71 through the first output planet gear 312 and the first output sun gear 311. The rotation direction of the first output shaft 71 is the same as that of the input shaft 1.

[0106] In the sixth gear position, the housing 8 is disengaged from the first input gear ring 213, the housing 8 is connected to the second input gear ring 223, the first output gear ring 313 is disengaged from the connecting hub 6, the housing 8 is disengaged from the second output gear ring 322, and the housing 8 is connected to the first output gear ring 313.

[0107] The power transmission process of the transmission in the sixth gear position is as follows:

[0108] The second input clutch 42 connects the housing 8 to the second input gear ring 223, and the third output clutch 45 connects the housing 8 to the first output gear ring 313. The input shaft 1 drives the second input sun gear 221 to rotate. The second input gear ring 223 remains fixed relative to the housing 8. The rotation of the second input planet gear 222 causes the second planet carrier 52 to rotate. The power is output from the second planet carrier 52. The first output gear ring 313 remains fixed relative to the housing 8. The power is transmitted to the first output shaft 71 through the first output planet gear 312 and the first output sun gear 311. The rotation direction of the first output shaft 71 is the same as that of the input shaft 1.

[0109] In some embodiments, as Figure 1 shown, the multiple input gear trains include a third input gear train. The third input gear train includes a third input sun gear 231, a third input planet gear 232, and a third input gear ring 233 that are meshed in sequence. The input shaft 1 is drivingly connected to the third input sun gear 231. The third input gear ring 233 is rotatably arranged coaxially with the second planet carrier 52. The transmission further includes a third planet carrier 53 and a third input clutch 46. The third input planet gear 232 is rotatably connected to the third planet carrier 53 about its own axis. The third input clutch 46 is configured to connect or disengage the housing 8 and the third planet carrier 53.

[0110] In some embodiments, the transmission has a seventh gear and an eighth gear.

[0111] In the seventh gear, the first output ring gear 313 is disengaged from the connecting hub 6, the housing 8 is connected to the second output planet gear 322, and the housing 8 is connected to the third planet carrier 53.

[0112] The power transmission process of the transmission in the seventh gear is as follows:

[0113] The third input clutch 46 connects the housing 8 and the third planet carrier 53, and the second output clutch 44 connects the housing 8 to the second output planet gear 322. The input shaft 1 drives the third input sun gear 231 to rotate. The third planet carrier 53 remains fixed relative to the housing 8, and the third input ring gear 233 rotates in the opposite direction to the input shaft 1. The third input ring gear 233 and the second planet carrier 52 can rotate coaxially, and the second planet carrier 52 rotates in the opposite direction to the input shaft 1. The second output ring gear 323 remains fixed relative to the housing 8. The power from the second planet carrier 52 is divided into two paths. One path is transmitted through the first output planet gear 312, the first output ring gear 313, the second output sun gear 321, the second output planet gear 322, and the first planet carrier 51 to the first output shaft 71, and the other path is transmitted through the first output planet gear 312 and the first output sun gear 311 to the first output shaft 71. The combined power is output by the first output shaft 71, and the rotation direction of the first output shaft 71 is opposite to that of the input shaft 1.

[0114] In the eighth gear, the first output ring gear 313 is connected to the connecting hub 6, the housing 8 is disengaged from the second output planet gear 322, and the housing 8 is connected to the third planet carrier 53.

[0115] The power transmission process of the transmission in the eighth gear is as follows:

[0116] The third input clutch 46 connects the housing 8 and the third planet carrier 53, and the first output clutch 43 connects the first output ring gear 313 to the connecting hub 6.

[0117] Similar to the power transmission route in the seventh gear, since the third planet carrier 53 remains fixed relative to the housing 8, the power is transmitted to the second planet carrier 52 through the third input gear train, and the rotation direction of the second planet carrier 52 is opposite to that of the input shaft 1. The power from the second planet carrier 52 is divided into two paths: one path is that since the first output ring gear 313 is fixed to the connecting hub 6, the power of the first output ring gear 313 is directly transmitted to the first output shaft 71 by the connecting hub 6, and the other path of power reaches the first output shaft 71 through the first output sun gear 311. The combined power is output by the first output shaft 71, and the rotation direction of the first output shaft 71 is opposite to that of the input shaft 1.

[0118] Based on the above embodiments, when power is input from the input shaft 1, by changing the operating states of the first input clutch 41, the second input clutch 42, and the third input clutch 46, the rotation directions of the second planet carrier 52 and the first output shaft 71 can be the same as or opposite to the rotation direction of the input shaft 1, thereby playing a role in changing the traveling direction of the construction machinery. Changing the operating states of the first output clutch 43, the second output clutch 44, and the third output clutch 45 does not affect the rotation direction of the first output shaft 71, mainly playing a role in changing the torque and speed and forming different gears.

[0119] For example, the first gear, the second gear, the third gear, the fourth gear, the fifth gear, and the sixth gear mentioned above can be used as the forward gears of the construction machinery, and the seventh gear and the eighth gear can be used as the reverse gears of the construction machinery, forming six forward gears and two reverse gears.

[0120] In some embodiments, as Figure 1 shown, the transmission further includes a first output gear 74, at least one intermediate shaft 72, at least one intermediate gear 75, a second output shaft 73, and a second output gear 76. The first output gear 74 is coaxially and fixedly connected to the first output shaft 71; at least one intermediate shaft 72 is installed on the housing 8; at least one intermediate gear 75 is correspondingly arranged with at least one intermediate shaft 72 and is coaxially and fixedly connected to the corresponding intermediate shaft 72; the second output shaft 73 is installed on the housing 8; the second output gear 76 is coaxially and fixedly connected to the second output shaft 73; wherein, the first output gear 74, at least one intermediate gear 75, and the second output gear 76 are meshed in sequence.

[0121] Based on the above settings, the first output shaft 71, the first output gear 74, at least one intermediate shaft 72, at least one intermediate gear 75, the second output shaft 73, and the second output gear 76 can form a power take-off box. The number of the intermediate gears 75 and the intermediate shafts 72 can be determined according to the requirements of the transmission output power and the shaft reduction.

[0122] In some embodiments, as Figure 1 shown, the axis of the first output shaft 71 does not coincide with the axis of the second output shaft 73.

[0123] Figure 1 In the embodiment shown, the transmission includes one intermediate shaft 72 and one intermediate gear 75. The axes of the first output shaft 71, the intermediate shaft 72, and the second output shaft 73 are parallel to each other, and in the state where the transmission is installed on the construction machinery, the axes of the first output shaft 71, the intermediate shaft 72, and the second output shaft 73 are arranged in sequence in the up-down direction.

[0124] The gearbox can directly output power through the first output shaft 71 as a gearbox without shaft reduction; or it can output power through a transfer case consisting of the first output shaft 71, the first output gear 74, at least one intermediate shaft 72, at least one intermediate gear 75, the second output shaft 73 and the second output gear 76, as a gearbox with shaft reduction.

[0125] According to the matching requirements of the complete transmission system of the construction machinery, the gearbox can include more or less input gear trains, and more or less output gear trains. For example, the input gear train can only include Figure 1 The first input gear train and the third input gear train in Figure 1 The second input sun gear in the transmission is not connected to the input shaft but is connected to the first output shaft, thereby forming four forward gears and four reverse gears.

[0126] like Figure 1 As shown, some embodiments of the present disclosure further provide a transmission system, comprising the aforementioned gearbox and a hydraulic torque converter 9. The hydraulic torque converter 9 is configured to provide power to the input shaft 1.

[0127] Figure 1 In the illustrated embodiment, the input shaft 1 can be directly fixedly connected to the turbine of the hydraulic torque converter 9, and the guide wheel of the hydraulic torque converter 9 is fixed to the housing 8. The transmission system provided by the present disclosure has the advantages of the aforementioned gearbox.

[0128] Some embodiments of the present disclosure also provide an engineering machine, comprising the aforementioned gearbox, or comprising the aforementioned transmission system.

[0129] The engineering machinery may be a crawler hydraulic transmission engineering vehicle or a wheel hydraulic transmission engineering vehicle, etc., and may be a two-wheel drive engineering vehicle or a four-wheel drive engineering vehicle. The engineering machinery provided by the present disclosure has the advantages of the aforementioned gearbox.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present disclosure can still be modified or some technical features can be replaced by equivalents, which should all be included in the scope of the technical solution for protection requested by the present disclosure.

Claims

1. A gearbox, characterized in that, Comprising: A housing (8); An input shaft (1) mounted on the housing (8); A plurality of input gear trains arranged in parallel, each input gear train including an input sun gear, an input planet gear, and an input ring gear that are sequentially meshed, and the input shaft (1) is in transmission connection with the input sun gear; A plurality of input clutches arranged corresponding to the plurality of input ring gears, configured to connect or disconnect the housing (8) from the corresponding input ring gear; A first output shaft (71) mounted on the housing (8); An output gear train including a first output sun gear (311), a first output planet gear (312), a first output ring gear (313), a second output sun gear (321), a second output planet gear (322), a second output ring gear (323), and a first planet carrier (51), the first output sun gear (311) is in transmission connection with the first output shaft (71), the first output sun gear (311), the first output planet gear (312), and the first output ring gear (313) are sequentially meshed, the first output ring gear (313) is in transmission connection with the second output sun gear (321), the second output sun gear (321), the second output planet gear (322), and the second output ring gear (323) are sequentially meshed, the second output planet gear (322) is rotatably connected to the first planet carrier (51) about its own axis, and the first planet carrier (51) is in transmission connection with the first output shaft (71); A second planet carrier (52), the input ring gear is arranged to be rotatable synchronously with the second planet carrier (52) or the input planet gear is rotatably connected to the second planet carrier (52) about its own axis, and the first output planet gear (312) is rotatably connected to the second planet carrier (52) about its own axis; A connection hub (6) in transmission connection with the first output shaft (71); A first output clutch (43) configured to connect or disconnect the first output ring gear (313) from the connection hub (6); And A second output clutch (44) configured to connect or disconnect the housing (8) from the second output ring gear (323); Wherein, the plurality of input gear trains include a first input gear train and a second input gear train, the first input gear train includes a first input sun gear (211), a first input planet gear (212), and a first input ring gear (213) that are sequentially meshed, the input shaft (1) is in transmission connection with the first input sun gear (211), the first input planet gear (212) is rotatably connected to the second planet carrier (52) about its own axis, the second input gear train includes a second input sun gear (221), a second input planet gear (222), and a second input ring gear (223) that are sequentially meshed, the input shaft (1) is in transmission connection with the second input sun gear (221), and the second input planet gear (222) is rotatably connected to the second planet carrier (52) about its own axis; The multiple input clutches include a first input clutch (41) and a second input clutch (42). The first input clutch (41) is configured to connect or disconnect the housing (8) from the first input gear ring (213), and the second input clutch (42) is configured to connect or disconnect the housing (8) from the second input gear ring (223).

2. The gearbox according to claim 1, characterized in that, The transmission has a first gear position, a second gear position, a third gear position, and a fourth gear position, where in the first gear position, the housing (8) is connected to the first input gear ring (213), the housing (8) is disconnected from the second input gear ring (223), the first output gear ring (313) is disconnected from the connecting hub (6), and the housing (8) is connected to the second output gear ring (323); in the second gear position, the housing (8) is disconnected from the first input gear ring (213), the housing (8) is connected to the second input gear ring (223), the first output gear ring (313) is disconnected from the connecting hub (6), and the housing (8) is connected to the second output gear ring (323); in the third gear position, the housing (8) is connected to the first input gear ring (213), the housing (8) is disconnected from the second input gear ring (223), the first output gear ring (313) is connected to the connecting hub (6), and the housing (8) is disconnected from the second output gear ring (323); in the fourth gear position, the housing (8) is disconnected from the first input gear ring (213), the housing (8) is connected to the second input gear ring (223), the first output gear ring (313) is connected to the connecting hub (6), and the housing (8) is disconnected from the second output gear ring (323).

3. The gearbox according to claim 1, characterized in that, It further includes a third output clutch (45), and the third output clutch (45) is configured to connect or disconnect the housing (8) from the first output gear ring (313).

4. The gearbox according to claim 3, characterized in that, The transmission has a fifth gear position and a sixth gear position, where in the fifth gear position, the housing (8) is connected to the first input gear ring (213), the housing (8) is disconnected from the second input gear ring (223), the first output gear ring (313) is disconnected from the connecting hub (6), the housing (8) is disconnected from the second output gear ring (323), and the housing (8) is connected to the first output gear ring (313); in the sixth gear position, the housing (8) is disconnected from the first input gear ring (213), the housing (8) is connected to the second input gear ring (223), the first output gear ring (313) is disconnected from the connecting hub (6), the housing (8) is disconnected from the second output gear ring (323), and the housing (8) is connected to the first output gear ring (313).

5. The transmission according to claim 1, wherein The multiple input gear trains include a third input gear train. The third input gear train includes a third input sun gear (231), a third input planet gear (232), and a third input ring gear (233) that are meshed in sequence. The input shaft (1) is drivingly connected to the third input sun gear (231), and the third input ring gear (233) is rotatably arranged coaxially with the second planet carrier (52). The transmission further includes a third planet carrier (53) and a third input clutch (46). The third input planet gear (232) is rotatably connected to the third planet carrier (53) about its own axis. The third input clutch (46) is configured to connect or disconnect the housing (8) and the third planet carrier (53).

6. The gearbox according to claim 5, characterized in that, The transmission has a seventh gear and an eighth gear. Among them, In the seventh gear, the first output ring gear (313) is disengaged from the connecting hub (6), the housing (8) is connected to the second output ring gear (323), and the housing (8) and the third planet carrier (53) are connected; In the eighth gear, the first output ring gear (313) is connected to the connecting hub (6), the housing (8) is disengaged from the second output ring gear (323), and the housing (8) and the third planet carrier (53) are connected.

7. The transmission according to any one of claims 1 to 6, characterized in that It further includes: A first output gear (74) coaxially and fixedly connected to the first output shaft (71); At least one intermediate shaft (72) mounted on the housing (8); At least one intermediate gear (75) correspondingly arranged with at least one of the intermediate shafts (72) and coaxially and fixedly connected to the corresponding intermediate shaft (72); A second output shaft (73) mounted on the housing (8); and A second output gear (76) coaxially and fixedly connected to the second output shaft (73); Among them, the first output gear (74), at least one of the intermediate gears (75), and the second output gear (76) are meshed in sequence.

8. The gearbox according to claim 7, characterized in that, The axis of the first output shaft (71) does not coincide with the axis of the second output shaft (73).

9. The transmission according to any one of claims 1 to 6, wherein The input shaft (1) is coaxially and fixedly connected to the input sun gear; and / or At least one of the first output sun gear (311), the connecting hub (6), and the first planet carrier (51) is coaxially and fixedly connected to the first output shaft (71); and / or The first output ring gear (313) is fixedly connected to the second output sun gear (321).

10. A transmission system, characterized in that, It includes: The transmission according to any one of claims 1 to 9; And A torque converter (9) configured to provide power to the input shaft (1).

11. An engineering machinery, characterized in that, It includes the transmission according to any one of claims 1 to 9, or includes the transmission system according to claim 10.

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