Roller transmission box without reversing mechanism but capable of realizing reversing

Abstract

The utility model relates to a roller transmission case which is not provided with a reversing mechanism but can achieve reversing, and belongs to the field of harvester roller transmission. Comprising an input shaft assembly, a one-shaft assembly, a multi-gear power transmission mechanism, an output shaft assembly, a plurality of gear shifting control mechanisms, an idle wheel assembly, a reverse gear assembly and a shell. The two ends of the input shaft assembly are connected with the first shaft assembly and an external power and transmission mechanism respectively, the first shaft assembly is connected with the multi-gear power transmission mechanism and the reverse gear assembly, and the gear shifting control mechanism is installed on the first shaft assembly in a sliding mode. The gear shifting control mechanism is arranged in the multi-gear power transmission mechanism and between the multi-gear power transmission mechanism and the reverse gear assembly, the output shaft assembly is connected with the multi-gear power transmission mechanism and the reverse gear assembly, the output shaft assembly is connected with the roller, and an idle wheel assembly used for achieving reverse rotation of the roller is installed on the reverse gear assembly. According to the utility model, the harvesting and threshing operation speed of different grain crops can be met, and blockage can be cleaned through reverse rotation when the roller is blocked.

Description

Technical Field

[0001] The utility model relates to the field of harvester drum transmission, in particular to a drum transmission box which is not provided with a reversing mechanism but can realize reversal. Background Art

[0002] A combine harvester is a large agricultural machine that mechanizes and harvests crops in farmland on a large scale. There are two structures of combine harvester drum boxes in the prior art:

[0003] (1) Single-speed drum transmission box with reversing mechanism. The disadvantage of this transmission box is that the speed is fixed and cannot meet the threshing requirements of different crops;

[0004] (2) Three-speed transmission box with reversing mechanism. Although this transmission box can meet the threshing requirements of different crops and the reversing mechanism can solve the problem of drum clogging, the structure is complex, large in size and high in cost. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a roller transmission box which is not provided with a reversing mechanism but can realize reversal, so as to solve the above-mentioned problem.

[0006] The utility model solves the above-mentioned technical problem with the following technical solution: a drum transmission box without a reversing mechanism but capable of reversing, comprising: an input shaft assembly, a single shaft assembly, a multi-speed power transmission mechanism, an output shaft assembly, a plurality of shifting control mechanisms, an idler assembly, a reverse gear assembly and a housing; the input shaft assembly, the single shaft assembly and the output shaft assembly are all mounted on the housing, the two ends of the input shaft assembly are respectively connected to the single shaft assembly and an external power and transmission mechanism, the single shaft assembly is connected to the multi-speed power transmission mechanism and the reverse gear assembly, the shifting control mechanism is slidably mounted on the single shaft assembly, the shifting control mechanism is arranged inside the multi-speed power transmission mechanism and between the multi-speed power transmission mechanism and the reverse gear assembly, the output shaft assembly is connected to the multi-speed power transmission mechanism and the reverse gear assembly, the output shaft assembly is connected to the drum, and the reverse gear assembly is equipped with the idler assembly for reversing the drum.

[0007] The beneficial effects of the utility model are as follows: by installing the idler wheel assembly on the reverse gear assembly, it is beneficial to realize the reversal of the output shaft assembly through the idler wheel assembly when the drum is blocked, thereby clearing the blockage; the multi-speed power transmission mechanism cooperates with the input shaft assembly and the single-axis assembly to realize power transmission; the shift operating mechanism is beneficial to realize the gear switching during drum transmission, thereby meeting the harvesting and threshing operation speeds of different grain crops. Compared with the existing drum transmission box, the utility model has the advantages of compact structure, light weight, small appearance and low cost.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the input shaft assembly includes an input shaft and an input shaft bearing, the input shaft bearing is sleeved on the input shaft, the input shaft is rotatably mounted on the housing through the input shaft bearing, and both ends of the input shaft are respectively connected to the one-shaft assembly and an external power and transmission mechanism.

[0010] The beneficial effect of adopting the above further solution is that the input shaft is rotatably mounted on the housing, which is conducive to transmitting external power to a shaft assembly.

[0011] Furthermore, the shaft assembly includes a shaft and a shaft bearing, the shaft bearing is sleeved on the shaft, and the shaft is rotatably mounted on the housing through the shaft bearing.

[0012] The beneficial effect of adopting the above further solution is that a shaft is rotatably mounted on the housing, which is conducive to transmitting the power transmitted from the input shaft to the multi-speed power transmission mechanism and the reverse gear assembly.

[0013] Furthermore, the input shaft and the first shaft are connected via a bevel gear.

[0014] The beneficial effect of adopting the above further solution is that the bevel gear width is conducive to transmitting the power on the input shaft to the first shaft, thereby realizing the transmission of power between the input shaft assembly and the first shaft assembly.

[0015] Furthermore, the multi-speed power transmission mechanism includes: a first gear assembly, a second gear assembly and a third gear assembly, the first gear assembly, the second gear assembly and the third gear assembly are all installed on the one shaft through needle bearings, the shift operating mechanism is slidably installed on the one shaft, and multiple shift operating mechanisms are respectively arranged between the second gear assembly and the third gear assembly and between the first gear assembly and the reverse gear assembly.

[0016] The beneficial effect of adopting the above further scheme is that the first gear assembly, the second gear assembly and the third gear assembly cooperate with the shift control mechanism to facilitate the gear switching during the drum transmission, thereby meeting the harvesting and threshing operation speed of different grain crops.

[0017] Further, the first gear assembly includes a first gear shaft, a first gear shaft driving gear, a first gear shaft driven gear and a first gear shaft combining gear, the first gear shaft driving gear and the first gear shaft combining gear are respectively installed at two ends of the first gear shaft, the first gear shaft combining gear is installed on the first shaft through a needle bearing, the first gear shaft driving gear is meshed with the first gear shaft driven gear, and the first gear shaft driven gear is installed on the output shaft assembly;

[0018] The second gear assembly includes a second gear shaft, a second gear shaft driving gear, a second gear shaft driven gear and a second gear shaft combining gear, wherein the second gear shaft driving gear and the second gear shaft combining gear are respectively installed at two ends of the second gear shaft, the second gear shaft combining gear is installed on the first shaft through a needle bearing, the second gear shaft driving gear is meshed with the second gear shaft driven gear, and the second gear shaft driven gear is installed on the output shaft assembly;

[0019] The third gear assembly includes a third gear shaft, a third gear shaft driving gear, a third gear shaft driven gear and a third gear shaft combining gear. The third gear shaft driving gear and the third gear shaft combining gear are respectively installed at two ends of the third gear shaft. The third gear shaft combining gear is installed on the one shaft through a needle bearing. The third gear shaft driving gear is meshed with the third gear shaft driven gear, and the third gear shaft driven gear is installed on the output shaft assembly.

[0020] The beneficial effect of adopting the above further scheme is that the meshing of the driving gear and the driven gear is conducive to the transmission of power between the multi-speed power transmission mechanism and the output shaft assembly, and the combination with the gear-matching shift control mechanism is conducive to the switching of gears.

[0021] Furthermore, the output shaft assembly includes an output shaft and an output shaft bearing, the output shaft bearing is sleeved on the output shaft, the output shaft is rotatably mounted on the housing through the output shaft bearing, and the first gear shaft driven gear, the second gear shaft driven gear and the third gear shaft driven gear are all fixedly mounted on the output shaft through splines.

[0022] The beneficial effect of adopting the above further solution is that the output shaft is rotatably mounted on the housing, which is conducive to transmitting the power of the first gear assembly, the second gear assembly, the third gear assembly or the reverse gear assembly to the drum.

[0023] Furthermore, the reverse gear assembly includes a reverse gear shaft, a reverse gear shaft driving gear, a reverse gear shaft passive gear and a reverse gear shaft combining gear, the reverse gear shaft driving gear and the reverse gear shaft combining gear are respectively installed at two ends of the reverse gear shaft, the reverse gear shaft combining gear is installed on the one shaft through a needle bearing, the two ends of the idler gear assembly are respectively meshed with the reverse gear shaft driving gear and the reverse gear shaft passive gear, and the reverse gear shaft passive gear is installed on the output shaft assembly.

[0024] The beneficial effect of adopting the above further scheme is that the reverse shaft driving gear and the reverse shaft passive gear cooperate with the idler gear assembly to facilitate the reverse rotation of the power, thereby achieving the reversal of the drum, and the reverse shaft combined gear cooperates with the shift control mechanism to facilitate the selection of reverse gear through the lever.

[0025] Furthermore, the idler assembly includes an idler shaft and an idler wheel. The idler wheel is sleeved on the idler shaft via a needle bearing. Two ends of the idler wheel are respectively meshed with the reverse shaft driving gear and the reverse shaft passive gear.

[0026] The beneficial effect of adopting the above further scheme is that after the idler gear is meshed with the reverse shaft driving gear and the reverse shaft driven gear, it is beneficial to transmit the power on the first shaft assembly to the idler gear assembly and then to the reverse gear assembly, thereby realizing the reversal of power and clearing the blockage of the drum.

[0027] Furthermore, the gear shift mechanism includes a gear hub and an engagement sleeve, wherein the gear hub is fixedly mounted on the one shaft, and the engagement sleeve is slidably connected to the gear hub so that the engagement sleeve engages with the second gear assembly or the third gear assembly or the first gear assembly or the reverse gear assembly to achieve gear switching.

[0028] The beneficial effect of adopting the above further solution is that the gear hub is conducive to transmitting the power on one shaft to the meshing sleeve and then to different gears, thereby meeting the harvesting and threshing operation speed of different grain crops. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a schematic diagram of the overall structure of an embodiment of the present invention.

[0030] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0031] 1. Input shaft assembly; 2. First shaft assembly; 3. Multi-speed power transmission mechanism; 4. Output shaft assembly; 5. Shift control mechanism; 6. Idler assembly; 7. Reverse gear assembly; 8. Housing; 9. Bevel gear width; 11. Input shaft; 12. Input shaft bearing; 21. First shaft; 22. First shaft bearing; 31. First gear assembly; 32. Second gear assembly; 33. Third gear assembly; 41. Output shaft; 42. Output shaft bearing; 51. Gear hub; 52. Engaging sleeve; 61. Idler shaft; 62. Idler. DETAILED DESCRIPTION

[0032] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0033] like Figure 1As shown, a drum transmission box without a reversing mechanism but capable of reversing comprises: an input shaft assembly 1, a single shaft assembly 2, a multi-speed power transmission mechanism 3, an output shaft assembly 4, a plurality of shift operating mechanisms 5, an idler assembly 6, a reverse gear assembly 7 and a housing 8; the input shaft assembly 1, the single shaft assembly 2 and the output shaft assembly 4 are all mounted on the housing 8, the two ends of the input shaft assembly 1 are respectively connected to the single shaft assembly 2 and an external power and transmission mechanism, the single shaft assembly 2 is connected to the multi-speed power transmission mechanism 3 and the reverse gear assembly 7, the shift operating mechanism 5 is slidably mounted on the single shaft assembly 2, the shift operating mechanism 5 is arranged inside the multi-speed power transmission mechanism 3 and between the multi-speed power transmission mechanism 3 and the reverse gear assembly 7, the output shaft assembly 4 is connected to the multi-speed power transmission mechanism 3 and the reverse gear assembly 7, the output shaft assembly 4 is connected to the drum, and the reverse gear assembly 7 is equipped with the idler assembly 6 for reversing the drum.

[0034] It should be noted that: in the preferred embodiment of the present utility model, "external power and transmission mechanism" refers to a power motor for providing power and a pulley for transmitting power;

[0035] The shift operating mechanism 5 is connected to a shift fork, and the movement of the shift operating mechanism 5 is controlled by the shift fork, thereby achieving the switching of gears.

[0036] The beneficial effects of the utility model are as follows: by installing the idler wheel assembly on the reverse gear assembly, it is beneficial to realize the reversal of the output shaft assembly through the idler wheel assembly when the drum is blocked, thereby clearing the blockage; the multi-speed power transmission mechanism cooperates with the input shaft assembly and the single-axis assembly to realize power transmission; the shift operating mechanism is beneficial to realize the gear switching during drum transmission, thereby meeting the harvesting and threshing operation speeds of different grain crops. Compared with the existing drum transmission box, the utility model has the advantages of compact structure, light weight, small appearance and low cost.

[0037] Preferably, Figure 1 As shown, the input shaft assembly 1 includes an input shaft 11 and an input shaft bearing 12. The input shaft bearing 12 is sleeved on the input shaft 11. The input shaft 11 is rotatably mounted on the housing 8 through the input shaft bearing 12. Both ends of the input shaft 11 are respectively connected to the one-shaft assembly 2 and the external power and transmission mechanism.

[0038] The beneficial effect of adopting the above preferred solution is that the input shaft is rotatably mounted on the housing, which is beneficial for transmitting external power to the shaft assembly.

[0039] Preferably, Figure 1As shown, the shaft assembly 2 includes a shaft 21 and a shaft bearing 22 . The shaft bearing 22 is sleeved on the shaft 21 . The shaft 21 is rotatably mounted on the housing 8 via the shaft bearing 22 .

[0040] The beneficial effect of adopting the above preferred solution is that a shaft is rotatably mounted on the housing, which is conducive to transmitting the power transmitted from the input shaft to the multi-speed power transmission mechanism and the reverse gear assembly.

[0041] Preferably, Figure 1 As shown, the input shaft 11 and the first shaft 21 are connected via a bevel gear web 9 .

[0042] The beneficial effect of adopting the above preferred solution is that the bevel gear width is conducive to transmitting the power on the input shaft to the first shaft, thereby realizing the transmission of power between the input shaft assembly and the first shaft assembly.

[0043] Preferably, Figure 1 As shown, the multi-speed power transmission mechanism 3 includes: a first gear assembly 31, a second gear assembly 32 and a third gear assembly 33. The first gear assembly 31, the second gear assembly 32 and the third gear assembly 33 are all installed on the one shaft 21 through needle bearings. The shift operating mechanism 5 is slidably installed on the one shaft 21. The multiple shift operating mechanisms 5 are respectively arranged between the second gear assembly 32 and the third gear assembly 33 and between the first gear assembly 31 and the reverse gear assembly 7.

[0044] The beneficial effect of adopting the above preferred solution is that the first gear assembly, the second gear assembly and the third gear assembly cooperate with the shift control mechanism to facilitate the gear switching during the drum transmission, thereby meeting the harvesting and threshing operation speed of different grain crops.

[0045] Preferably, Figure 1 As shown, the first gear assembly 31 includes a first gear shaft, a first gear shaft driving gear, a first gear shaft driven gear and a first gear shaft combining gear, the first gear shaft driving gear and the first gear shaft combining gear are respectively mounted on both ends of the first gear shaft, the first gear shaft combining gear is mounted on the first shaft 21 through a needle bearing, the first gear shaft driving gear is meshed with the first gear shaft driven gear, and the first gear shaft driven gear is mounted on the output shaft assembly 4;

[0046] The second gear assembly 32 includes a second gear shaft, a second gear shaft driving gear, a second gear shaft driven gear and a second gear shaft combining gear, wherein the second gear shaft driving gear and the second gear shaft combining gear are respectively mounted at both ends of the second gear shaft, the second gear shaft combining gear is mounted on the first shaft 21 through a needle bearing, the second gear shaft driving gear is meshed with the second gear shaft driven gear, and the second gear shaft driven gear is mounted on the output shaft assembly 4;

[0047] The third gear assembly 33 includes a third gear shaft, a third gear shaft driving gear, a third gear shaft driven gear and a third gear shaft combining gear. The third gear shaft driving gear and the third gear shaft combining gear are respectively installed at both ends of the third gear shaft. The third gear shaft combining gear is installed on the one shaft 21 through a needle bearing. The third gear shaft driving gear is meshed with the third gear shaft driven gear, and the third gear shaft driven gear is installed on the output shaft assembly 4.

[0048] The beneficial effect of adopting the above preferred solution is that the meshing of the driving gear and the driven gear is conducive to the transmission of power between the multi-speed power transmission mechanism and the output shaft assembly, and the combination with the gear-matching shift control mechanism is conducive to the switching of gears.

[0049] Preferably, Figure 1 As shown, the output shaft assembly 4 includes an output shaft 41 and an output shaft bearing 42, the output shaft bearing 42 is sleeved on the output shaft 41, the output shaft 41 is rotatably mounted on the housing 8 through the output shaft bearing 42, and the first gear shaft driven gear, the second gear shaft driven gear and the third gear shaft driven gear are all fixedly mounted on the output shaft 41 through splines.

[0050] The beneficial effect of adopting the above preferred solution is that the output shaft is rotatably mounted on the housing, which is conducive to transmitting the power of the first gear assembly, the second gear assembly, the third gear assembly or the reverse gear assembly to the drum.

[0051] Preferably, Figure 1 As shown, the reverse gear assembly 7 includes a reverse gear shaft, a reverse gear shaft driving gear, a reverse gear shaft driven gear and a reverse gear shaft combining gear, wherein the reverse gear shaft driving gear and the reverse gear shaft combining gear are respectively mounted at two ends of the reverse gear shaft, and the reverse gear shaft combining gear is mounted on the one shaft 21 through a needle bearing, and the two ends of the idler gear assembly 6 are respectively meshed with the reverse gear shaft driving gear and the reverse gear shaft driven gear, and the reverse gear shaft driven gear is mounted on the output shaft assembly 4.

[0052] It should be noted that: in the technical solution of the present utility model, the reverse shaft driven gear is fixedly mounted on the output shaft 41 via a spline.

[0053] The beneficial effects of adopting the above preferred solution are: the reverse shaft driving gear and the reverse shaft passive gear cooperate with the idler gear assembly to facilitate the reverse rotation of the power, thereby achieving the reversal of the drum, and the reverse shaft combined gear cooperates with the shift control mechanism to facilitate the selection of reverse gear through the lever.

[0054] Preferably, Figure 1As shown, the idler assembly 6 includes an idler shaft 61 and an idler 62. The idler 62 is sleeved on the idler shaft 61 through a needle bearing. Both ends of the idler 62 are respectively meshed with the reverse shaft driving gear and the reverse shaft driven gear.

[0055] The beneficial effect of adopting the above preferred solution is that after the idler wheel is meshed with the reverse shaft driving gear and the reverse shaft passive gear, it is beneficial to transmit the power on the first shaft assembly to the idler wheel assembly and then to the reverse gear assembly, thereby realizing the reversal of power and clearing the blockage of the drum.

[0056] Preferably, Figure 1 As shown, the gear shift mechanism 5 includes a gear hub 51 and an engagement sleeve 52, wherein the gear hub 51 is fixedly mounted on the first shaft 21, and the engagement sleeve 52 is slidably connected to the gear hub 51 so that the engagement sleeve 52 engages with the second gear assembly 32 or the third gear assembly 33 or the first gear assembly 31 or the reverse gear assembly 7 to achieve gear switching.

[0057] It should be noted that: in the technical solution of the present utility model, the meshing sleeve 52 is connected to one of the first gear shaft combining teeth in the first gear assembly 31, the second gear shaft combining teeth in the second gear assembly 32, the third gear shaft combining teeth in the third gear assembly 33, and the reverse gear shaft combining teeth in the reverse gear assembly 7, so as to realize the switching of gears and the transmission of power.

[0058] The beneficial effect of adopting the above preferred solution is that the gear hub is conducive to transmitting the power on one shaft to the meshing sleeve and then to different gears, thereby meeting the harvesting and threshing operation speed of different grain crops.

[0059] The power transmission process of the utility model is described below by an embodiment:

[0060] like Figure 1 As shown, during normal operation, the appropriate gear is first selected according to the different grain crops to be harvested, that is, the meshing sleeve 52 is combined with the first gear shaft combination teeth or the second gear shaft combination teeth or the third gear shaft combination teeth through the shift fork, and the external power is transmitted to the input shaft 11, the bevel gear width 9, the first shaft 21, the gear hub 51, the meshing sleeve 52, the driving gear, the driven gear, the output shaft 41 and the drum in sequence through the pulley. Among them, the driving gear and the driven gear refer to the driving gear and the driven gear corresponding to a certain gear of the first gear assembly 31 or the second gear assembly 32 or the third gear assembly 33.

[0061] When the drum is blocked and needs to be reversed, the reverse gear is selected, that is, the engagement sleeve 52 is engaged with the reverse gear shaft coupling tooth in the reverse gear assembly 7 through the shift fork, and the external power is transmitted to the input shaft 11, the bevel gear width 9, the first shaft 21, the gear hub 51, the engagement sleeve 52, the reverse gear shaft driving gear, the idler 62, the idler shaft 61, the idler 62, the reverse gear shaft driven gear, the output shaft 41 and the drum in sequence through the pulley. Among them, the reverse gear assembly 7 has an additional transmission stage, that is, the transmission of the idler assembly 6 is added, so that the direction of the output shaft 41 is reversed.

[0062] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0063] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0064] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0067] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A drum transmission box without a reversing mechanism but capable of reversing, characterized in that: include: An input shaft assembly (1), a first shaft assembly (2), a multi-speed power transmission mechanism (3), an output shaft assembly (4), a plurality of gear shifting control mechanisms (5), an idler assembly (6), a reverse gear assembly (7) and a housing (8); The input shaft assembly (1), the one-shaft assembly (2) and the output shaft assembly (4) are all mounted on the housing (8); the two ends of the input shaft assembly (1) are respectively connected to the one-shaft assembly (2) and an external power and transmission mechanism; the one-shaft assembly (2) is connected to the multi-speed power transmission mechanism (3) and the reverse gear assembly (7); the shift operating mechanism (5) is slidably mounted on the one-shaft assembly (2); the shift operating mechanism (5) is arranged inside the multi-speed power transmission mechanism (3) and between the multi-speed power transmission mechanism (3) and the reverse gear assembly (7); the output shaft assembly (4) is connected to the multi-speed power transmission mechanism (3) and the reverse gear assembly (7); the output shaft assembly (4) is connected to a drum; and the reverse gear assembly (7) is provided with an idler wheel assembly (6) for realizing the reverse rotation of the drum.

2. A drum transmission box without a reversing mechanism but capable of reversing according to claim 1, characterized in that: The input shaft assembly (1) comprises an input shaft (11) and an input shaft bearing (12), wherein the input shaft bearing (12) is sleeved on the input shaft (11), and the input shaft (11) is rotatably mounted on the housing (8) via the input shaft bearing (12), and the two ends of the input shaft (11) are respectively connected to the first shaft assembly (2) and an external power and transmission mechanism.

3. A drum transmission box without a reversing mechanism but capable of reversing according to claim 2, characterized in that: The shaft assembly (2) comprises a shaft (21) and a shaft bearing (22), wherein the shaft bearing (22) is sleeved on the shaft (21), and the shaft (21) is rotatably mounted on the housing (8) via the shaft bearing (22).

4. A drum transmission box without a reversing mechanism but capable of reversing according to claim 3, characterized in that: The input shaft (11) and the first shaft (21) are connected via a bevel gear web (9).

5. A drum transmission box without a reversing mechanism but capable of reversing according to claim 3, characterized in that: The multi-speed power transmission mechanism (3) comprises: a first gear assembly (31), a second gear assembly (32) and a third gear assembly (33); the first gear assembly (31), the second gear assembly (32) and the third gear assembly (33) are all mounted on the first shaft (21) via needle bearings; the shift operating mechanism (5) is slidably mounted on the first shaft (21); and a plurality of the shift operating mechanisms (5) are respectively arranged between the second gear assembly (32) and the third gear assembly (33) and between the first gear assembly (31) and the reverse gear assembly (7).

6. A drum transmission box without a reversing mechanism but capable of reversing according to claim 5, characterized in that: The first gear assembly (31) comprises a first gear shaft, a first gear shaft driving gear, a first gear shaft driven gear and a first gear shaft combining gear, wherein the first gear shaft driving gear and the first gear shaft combining gear are respectively mounted at two ends of the first gear shaft, the first gear shaft combining gear is mounted on the first shaft (21) via a needle bearing, the first gear shaft driving gear is meshed with the first gear shaft driven gear, and the first gear shaft driven gear is mounted on the output shaft assembly (4); The second gear assembly (32) comprises a second gear shaft, a second gear shaft driving gear, a second gear shaft driven gear and a second gear shaft combining gear, wherein the second gear shaft driving gear and the second gear shaft combining gear are respectively mounted at two ends of the second gear shaft, the second gear shaft combining gear is mounted on the first shaft (21) via a needle bearing, the second gear shaft driving gear is meshed with the second gear shaft driven gear, and the second gear shaft driven gear is mounted on the output shaft assembly (4); The third gear assembly (33) comprises a third gear shaft, a third gear shaft driving gear, a third gear shaft driven gear and a third gear shaft combining gear, wherein the third gear shaft driving gear and the third gear shaft combining gear are respectively mounted at two ends of the third gear shaft, the third gear shaft combining gear is mounted on the first shaft (21) via a needle bearing, the third gear shaft driving gear is meshed with the third gear shaft driven gear, and the third gear shaft driven gear is mounted on the output shaft assembly (4).

7. A drum transmission box without a reversing mechanism but capable of reversing according to claim 6, characterized in that: The output shaft assembly (4) comprises an output shaft (41) and an output shaft bearing (42), wherein the output shaft bearing (42) is sleeved on the output shaft (41), and the output shaft (41) is rotatably mounted on the housing (8) via the output shaft bearing (42), and the first gear shaft driven gear, the second gear shaft driven gear and the third gear shaft driven gear are all fixedly mounted on the output shaft (41) via splines.

8. A drum transmission box without a reversing mechanism but capable of reversing according to claim 5, characterized in that: The reverse gear assembly (7) comprises a reverse gear shaft, a reverse gear shaft driving gear, a reverse gear shaft driven gear and a reverse gear shaft coupling gear, wherein the reverse gear shaft driving gear and the reverse gear shaft coupling gear are respectively mounted at two ends of the reverse gear shaft, and the reverse gear shaft coupling gear is mounted on the first shaft (21) via a needle bearing, and the two ends of the idler gear assembly (6) are respectively meshed with the reverse gear shaft driving gear and the reverse gear shaft driven gear, and the reverse gear shaft driven gear is mounted on the output shaft assembly (4).

9. A drum transmission box without a reversing mechanism but capable of reversing according to claim 8, characterized in that: The idler wheel assembly (6) comprises an idler wheel shaft (61) and an idler wheel (62). The idler wheel (62) is sleeved on the idler wheel shaft (61) via a needle bearing. Two ends of the idler wheel (62) are respectively meshed with the reverse gear shaft driving gear and the reverse gear shaft driven gear.

10. A drum transmission box without a reversing mechanism but capable of reversing according to claim 8, characterized in that: The gear shift mechanism (5) comprises a gear hub (51) and an engagement sleeve (52), wherein the gear hub (51) is fixedly mounted on the shaft (21), and the engagement sleeve (52) is slidably connected to the gear hub (51) so that the engagement sleeve (52) engages with the second gear assembly (32) or the third gear assembly (33) or the first gear assembly (31) or the reverse gear assembly (7) to achieve gear shifting.

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