Four-wheel drive gearbox with drum type parking brake and transmission shaft arranged on upper portion and harvester

Abstract

The utility model relates to a four-wheel drive gearbox with a drum type parking brake and a transmission shaft arranged on the upper portion and a harvester. The four-wheel-drive gearbox comprises a transfer case and a driving case, the rear end of the transfer case is higher than the front end of the transfer case, a transfer case input shaft, a plurality of idler shafts, a transfer case middle shaft and a transfer case transmission shaft are arranged in the transfer case, idler wheels are arranged on the transfer case input shaft, the idler shafts and the transfer case middle shaft, a driving gear is rotationally arranged on the transfer case middle shaft, and a transmission shaft is arranged on the driving gear. A driven gear is arranged on a transmission shaft of the transfer case, a third gear shifting gear hub is fixed on a middle shaft of the transfer case and provided with a gear shifting gear ring connected with or separated from the driving gear, the right end of an input shaft of the transfer case is connected with a drum type parking brake, and a transfer case output shaft is rotatably arranged at the rear end of the transfer case. The front end of the transfer case output shaft is in transmission connection with the transfer case transmission shaft, and the right end of the intermediate shaft is connected with the left end of the transfer case input shaft. The drum type parking brake has the advantages that the drum type parking brake can better achieve parking braking, and the transfer case output shaft is arranged on the upper portion, so that grass winding is not prone to occurring.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission of gearboxes, in particular to a four-wheel drive gearbox with a drum-type parking brake and an upper-mounted transmission shaft and a harvester. Background Art

[0002] The gearbox is a core component of the transmission system of a wheeled harvester and has the functions of traveling and speed change. The gearbox has speed-changing gears, and speed change is achieved by shifting gears with a shift fork, so as to achieve speed change of the wheeled machine.

[0003] In order to better cope with the complex working environment of wheeled harvesters, many four-wheel drive wheeled harvesters have emerged on the market. At present, the four-wheel drive wheeled harvesters on the market are mainly divided into two categories: hydrostatic four-wheel drive and mechanical four-wheel drive. The hydrostatic four-wheel drive realizes four-wheel drive by connecting a motor to the rear drive axle, and this structure has a high cost. The mechanical four-wheel drive transmits power to the final drive box assembly and the rear drive axle assembly through the form of a gearbox plus a four-wheel drive transfer case and a transmission shaft, so as to achieve four-wheel drive. Most four-wheel drive gearboxes on the market adopt the method of connecting the main box and the four-wheel drive transfer case with a universal joint. The brake is generally located on the main box assembly, and the brake is generally a band brake. The transmission shaft between it and the rear drive axle is generally close to the ground. This structure has the following disadvantages:

[0004] It occupies a large space and is not suitable for some wheeled machines with a compact structure and a small wheelbase; due to process and its own structural limitations, the band brake wears very quickly; the transmission shaft between it and the rear drive axle assembly is close to the ground. First, it is easy to entangle with grass. Second, many current models require a rotary tiller. Since the transmission shaft is close to the ground, there is not enough installation space for the rotary tiller.

[0005] Based on this, it is necessary to develop a four-wheel drive gearbox with a drum-type parking brake and an upper-mounted transmission shaft and a harvester with it to overcome the above technical problems. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to provide a four-wheel drive gearbox with a drum-type parking brake and an upper-mounted transmission shaft and a harvester, which effectively overcomes the defects of the prior art.

[0007] The technical solution of the utility model to solve the above technical problems is as follows:

[0008] A four-wheel drive transmission with a drum parking brake and a transmission shaft on top, comprising a transfer case and a driving case, wherein the height of the rear end of the transfer case is higher than the height of the front end thereof, and the transfer case is provided with a transfer case input shaft extending in the left-right direction and rotatably assembled therewith, a plurality of idler shafts, a transfer case middle shaft and a transfer case transmission shaft from front to rear, wherein the transfer case input shaft, the plurality of idler shafts and the transfer case middle shaft are respectively provided with idlers coaxially, and the adjacent idlers mesh with each other, a driving gear is coaxially rotatably provided on the transfer case middle shaft, and a gear coaxially rotatably engaged with the driving gear is provided on the transfer case transmission shaft A meshing driven gear, a third shift gear hub is coaxially fixed on the transfer case center shaft, the third shift gear hub is axially slidably equipped with a shift gear ring connected or separated from the above-mentioned driving gear, the right end of the transfer case input shaft is connected to the drum parking brake, the rear end of the transfer case is rotatably equipped with a transfer case output shaft extending forward and backward, the front end of the transfer case output shaft is transmission-connected to the transfer case drive shaft through a transmission assembly, the above-mentioned active case is arranged at the left front of the above-mentioned transfer case, and the right end of the intermediate shaft of the above-mentioned active case is coaxially transmission-connected to the left end of the above-mentioned transfer case input shaft.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, two idler shafts are provided.

[0011] Furthermore, the height of the transfer case transmission shaft is higher than the height of the transfer case center shaft, and the height of the transfer case center shaft is higher than the height of an adjacent idler shaft.

[0012] Furthermore, the transmission assembly includes a first bevel gear and a second bevel gear meshing with each other, the first bevel gear is coaxially mounted on the transfer case transmission shaft, and the second bevel gear is coaxially mounted on the front end of the transfer case output shaft.

[0013] Furthermore, the right end of the intermediate shaft of the active case and the left end of the transfer case input shaft are respectively provided with splines, and the external parts of the two are splined with spline sleeves, the external sleeve of the spline sleeve is provided with a transfer case connecting seat, and the left and right ends of the transfer case connecting seat are respectively connected and fixed to the transfer case and the active case.

[0014] Furthermore, the rear end of the transfer case is curved upward from front to rear.

[0015] Further, left and right output shafts distributed coaxially are rotatably installed on the side walls at the left and right ends inside the above-mentioned main drive housing respectively. One ends of the above-mentioned left and right output shafts close to each other are connected by a differential. The above-mentioned intermediate shaft is arranged behind the above-mentioned left and right output shafts. An input shaft of the main drive housing extending in the left-right direction is provided behind the above-mentioned intermediate shaft. Both ends of the above-mentioned input shaft of the main drive housing are rotatably connected to the above-mentioned main drive housing respectively. The above-mentioned intermediate shaft and the input shaft of the main drive housing are drivingly connected through a multi-gear shifting assembly. The above-mentioned differential is drivingly connected to the above-mentioned intermediate shaft through a gear transmission assembly.

[0016] Further, the above-mentioned multi-gear shifting assembly includes a first-gear main gear and a first-gear auxiliary gear that mesh with each other, a second-gear main gear and a second-gear auxiliary gear that mesh with each other, a third-gear main gear and a third-gear auxiliary gear that mesh with each other, a first shifting gear hub and a second shifting gear hub. The above-mentioned first-gear main gear and the second-gear main gear are coaxially and fixedly installed on the above-mentioned input shaft of the main drive housing respectively, and the two are close to each other. The above-mentioned first-gear auxiliary gear and the second-gear auxiliary gear are coaxially and rotatably assembled on the above-mentioned intermediate shaft respectively. The above-mentioned first shifting gear hub is coaxially and fixedly installed on the above-mentioned intermediate shaft and is located between the above-mentioned first-gear auxiliary gear and the second-gear auxiliary gear. A first gear ring that slides axially along it is nested outside the above-mentioned first shifting gear hub. The above-mentioned first gear ring axially slides to selectively connect or disconnect from the above-mentioned first-gear main gear and the second-gear main gear. The above-mentioned third-gear main gear is coaxially and rotatably assembled on the above-mentioned input shaft of the main drive housing. The above-mentioned third-gear auxiliary gear is coaxially and fixedly installed on the above-mentioned intermediate shaft. The above-mentioned second shifting gear hub is coaxially and fixedly installed on the above-mentioned input shaft of the main drive housing and is close to the above-mentioned third-gear main gear. A second gear ring that slides axially along it is nested outside the above-mentioned second shifting gear hub. The above-mentioned second gear ring slides to connect or disconnect from the above-mentioned third-gear main gear.

[0017] Further, the above-mentioned gear transmission assembly includes a constantly meshing main gear and a constantly meshing auxiliary gear that mesh with each other. The above-mentioned constantly meshing main gear is coaxially and fixedly installed on the above-mentioned intermediate shaft. The above-mentioned constantly meshing auxiliary gear is coaxially installed on the above-mentioned differential.

[0018] The beneficial effects of the present utility model are as follows: The structure is reasonably designed. The use of a drum-type parking brake can better achieve parking braking and improve the service life. The output shaft of the transfer case is placed above, which is not easy to entangle with grass and also reserves installation space for components such as the rotary tiller.

[0019] A harvester is also provided, which includes a four-wheel drive transmission with a drum-type parking brake and an output shaft placed above. Description of the Drawings

[0020] Figure 1 It is a cross-sectional view of the internal structure of the four-wheel drive transmission with a drum-type parking brake of the present utility model;

[0021] Figure 2The utility model is a side view of a four-wheel drive transmission with a drum parking brake and a transmission shaft mounted thereon.

[0022] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0023] 1. Transfer case; 2. Active gear case; 3. Drum parking brake; 4. Spline sleeve; 5. Transfer case connector; 11. Transfer case input shaft; 12. Transfer case middle shaft; 13. Transfer case drive shaft; 14. Transfer case output shaft; 21. Intermediate shaft; 22. Left output shaft; 23. Right output shaft; 24. Differential; 25. Active gear case input shaft; 26. First shift gear hub; 27. Second shift gear hub; 121. Active gear; 122. Third shift gear hub; 123. Shift gear ring; 131. Passive gear; 141. First bevel gear; 142. Second bevel gear. DETAILED DESCRIPTION

[0024] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0025] Example: Figure 1 and 2 As shown, the four-wheel drive transmission with a drum parking brake on the transmission shaft of this embodiment includes a transfer case 1 and a driving case 2. The height of the rear end of the transfer case 1 is higher than the height of the front end thereof. The transfer case 1 is provided with a transfer case input shaft 11 extending in the left-right direction and rotatably assembled therewith, a plurality of idler shafts (denoted by a in the figure), a transfer case middle shaft 12 and a transfer case transmission shaft 13 spaced from front to rear. Idlers (denoted by b in the figure) are coaxially mounted on the transfer case input shaft 11, the plurality of idler shafts and the transfer case middle shaft 12, respectively. Adjacent idler wheels are meshed with each other. A driving gear 121 is coaxially mounted on the transfer case middle shaft 12, and a drive gear 121 is coaxially mounted on the transfer case transmission shaft 13. A driven gear 131 meshes with the gear 121, a third shift gear hub 122 is coaxially fixed on the transfer case middle shaft 12, and the third shift gear hub 122 is axially slidably provided with a shift gear ring 123 connected to or separated from the driving gear 121, the right end of the transfer case input shaft 11 is connected to the drum parking brake 3, the rear end of the transfer case 1 is rotatably provided with a transfer case output shaft 14 extending forward and backward, the front end of the transfer case output shaft 14 is transmission-connected to the transfer case drive shaft 13 through a transmission assembly, the active case 2 is arranged at the left front of the transfer case 1, and the right end of the intermediate shaft 21 of the active case 2 is coaxially transmission-connected to the left end of the transfer case input shaft 11.

[0026] In the four-wheel drive transmission with the drum type parking brake and the drive shaft located above in this embodiment, after the main gearbox 2 is in gear or shifted, the power is transmitted to the transfer case input shaft 11 through the intermediate shaft 21, then transmitted to the transfer case intermediate shaft 12 through the idler gear, and then the power is transmitted to the transfer case drive shaft 13 by engaging the third shift gear hub 122, and finally the power is transmitted to the transfer case output shaft 14 through the transmission assembly, specifically as follows:

[0027] The main gearbox 2 is a multi-gear transmission box that can switch multiple gears to output power. By operating the sliding of the shift gear ring 123 to connect or disconnect from the driving gear 121, the transmission or blocking of power to the transfer case drive shaft 13 and the subsequent transfer case output shaft 14 is realized. Among them, the main gearbox 2 mainly realizes front-wheel drive, and the transfer case output shaft 14 of the transfer case 1 realizes rear-wheel drive.

[0028] In this embodiment, the surface of the third shift gear hub 122 is provided with external splines, and the inner ring of the shift gear ring 123 is provided with internal splines. At one end of the driving gear 121, an external spline that mates with the internal spline of the shift gear ring 123 is coaxially provided. The shift gear ring 123 can slide axially until the internal spline of the inner ring of the shift gear ring 123 is connected or separated from the external spline of the driving gear 121. When connected, the effective transmission of power between the two is realized. After separation, the power is no longer transmitted. This structure belongs to the existing mature technology and will not be elaborated here.

[0029] In the four-wheel drive transmission with the drum type parking brake and the drive shaft located above in this embodiment, the transfer case 1 adopts a special structural design with the rear end tilted upward. Compared with the prior art, the ground clearance of the transfer case output shaft 14 is increased, that is, the transfer case output shaft is located above, which is not easy to entangle with grass, and installation space is reserved for components such as the rotary tiller. In addition, by adopting the drum type parking brake, the parking brake can be better realized and the service life can be improved.

[0030] In this embodiment, there are two idler shafts as described above.

[0031] In this embodiment, the height of the transfer case drive shaft 13 is higher than the height of the transfer case intermediate shaft 12, and the height of the transfer case intermediate shaft 12 is higher than the height of an adjacent idler shaft. Such a gradually changing height trend, combined with the height change at the rear end of the transfer case 1, can effectively increase the ground clearance of the transfer case output shaft 14, and moreover, the external shape line of the transfer case 1 will be relatively smooth and beautiful.

[0032] In this embodiment, the transmission assembly includes a first bevel gear 141 and a second bevel gear 142 meshing with each other, the first bevel gear 141 is coaxially mounted on the transfer case transmission shaft 13, and the second bevel gear 142 is coaxially mounted on the front end of the transfer case output shaft 14. The rotation of the transfer case transmission shaft 13 drives the first bevel gear 141 to rotate, and the power is transmitted to the transfer case output shaft 14 after the second bevel gear 142 is reversed, so as to achieve stable power output.

[0033] As a preferred embodiment, the right end of the intermediate shaft 21 of the above-mentioned active case 2 and the left end of the above-mentioned transfer case input shaft 11 are respectively provided with splines, and the outsides of the two are splined with a spline sleeve 4, and the outer sleeve of the above-mentioned spline sleeve 4 is provided with a transfer case connecting seat 5, and the left and right ends of the above-mentioned transfer case connecting seat 5 are respectively connected and fixed to the above-mentioned transfer case 1 and the active case 2.

[0034] In the above embodiment, the shaft connection between the driving case 2 and the transfer case 1 is specifically connected by a spline (sleeve), which reduces the installation space of the transfer case 1 and is suitable for a wheeled machine with a compact structure.

[0035] In this embodiment, the rear end of the transfer case 1 is curved upward from front to rear.

[0036] As a preferred embodiment, a left output shaft 22 and a right output shaft 23 coaxially distributed are rotatably mounted on the left and right end side walls of the active case 2, and the ends of the left output shaft 22 and the right output shaft 23 close to each other are connected by a differential 24. The intermediate shaft 21 is arranged behind the left output shaft 22 and the right output shaft 23, and an active case input shaft 25 extending in the left and right directions is arranged behind the intermediate shaft 21. Both ends of the active case input shaft 25 are rotatably connected to the active case 2, and the intermediate shaft 21 and the active case input shaft 25 are transmission-connected by a multi-gear shifting assembly, and the differential 24 is transmission-connected to the intermediate shaft 21 by a gear transmission assembly.

[0037] In the above implementation scheme, the active box input shaft 25 inputs power, and the power is converted into different speeds through the multi-speed shift assembly and then transmitted to the intermediate shaft 21. The intermediate shaft 21 then transmits the power to the transfer case 1 and the differential 24. The power is transmitted to the left output shaft 22 and the right output shaft 23 through the differential 24, and the output of different speeds of the left output shaft 22 and the right output shaft 23 is realized. This structure is relatively mature and the operation is relatively stable.

[0038] In this embodiment, the multi-gear shift assembly belongs to the existing mature technology, and specifically adopts the structure including:

[0039] The above multi-gear shifting assembly includes a first-gear main gear (designated as c in the figure) and a first-gear auxiliary gear (designated as d in the figure) that mesh with each other, a second-gear main gear (designated as e in the figure) and a second-gear auxiliary gear (designated as f in the figure) that mesh with each other, a third-gear main gear (designated as m in the figure) and a third-gear auxiliary gear (designated as n in the figure) that mesh with each other, a first shifting hub 26 and a second shifting hub 27. The above first-gear main gear and second-gear main gear are respectively coaxially and fixedly installed on the input shaft 25 of the driving box, and the two are close to each other. The above first-gear auxiliary gear and second-gear auxiliary gear are respectively coaxially and rotatably assembled on the intermediate shaft 21. The above first shifting hub 26 is coaxially and fixedly installed on the intermediate shaft 21 and is located between the first-gear auxiliary gear and the second-gear auxiliary gear. A first gear ring that slides axially along the first shifting hub 26 is nested outside the first shifting hub 26. The first gear ring axially slides to selectively connect or disconnect from the first-gear main gear and the second-gear main gear. The above third-gear main gear is coaxially and rotatably assembled on the input shaft 25 of the driving box. The above third-gear auxiliary gear is coaxially and fixedly installed on the intermediate shaft 21. The above second shifting hub 27 is coaxially and fixedly installed on the input shaft 25 of the driving box and is close to the third-gear main gear. A second gear ring that slides axially along the second shifting hub 27 is nested outside the second shifting hub 27. The second gear ring slides to connect or disconnect the internal spline of its inner ring from the external spline of the third-gear main gear.

[0040] Wherein, a first gear ring is nested outside the first shifting hub 26 through splines. At one end where the first-gear main gear and the second-gear main gear are relatively close to each other, extension parts are respectively coaxially provided. External splines that cooperate with the internal splines of the inner ring of the first gear ring are respectively provided on the extension parts. In this way, after the first gear ring slides, it can selectively cooperate with the external splines on the extension parts of the first-gear main gear and the second-gear main gear through the internal splines of its inner ring, so as to realize connection and effective transmission of power.

[0041] In this embodiment, the above gear transmission assembly includes a constantly meshing main gear and a constantly meshing auxiliary gear that mesh with each other. The above constantly meshing main gear is coaxially and fixedly installed on the intermediate shaft 21. The above constantly meshing auxiliary gear is coaxially installed on the differential 24. Power is transmitted from the intermediate shaft 21 to the constantly meshing main gear and the constantly meshing auxiliary gear, and thus transmitted to the differential 24. The differential 24 enables the left output shaft 22 and the right output shaft 23 to have different rotational speeds. Among them, the specific connection structure and principle between the differential 24 and the left output shaft 22 and the right output shaft 23 belong to the prior art and will not be elaborated here.

[0042] It should be further noted that in this embodiment, the transmission route is specifically as follows:

[0043] First-gear power transmission route: Power is input from the input shaft 25 of the main gearbox to the first-gear main gear and the first-gear auxiliary gear, then to the intermediate shaft 21, the constantly meshing main gear and the constantly meshing auxiliary gear, and then to the left output shaft 22 and the right output shaft 23, and then transmitted to the left and right final drive boxes to achieve front-wheel drive; at the same time, power is input from the input shaft 25 of the main gearbox to the first-gear main gear and the first-gear auxiliary gear, then to the intermediate shaft 21, the spline sleeve 4, the input shaft 11 of the transfer case, multiple idler gears, the intermediate shaft 12 of the transfer case, the driving gear 121 and the driven gear 131, the drive shaft 13 of the transfer case, the first bevel gear 141 and the second bevel gear 142, and the output shaft 14 of the transfer case, and then to the rear drive axle assembly to achieve rear-wheel drive;

[0044] Second-gear power transmission route: Power is input from the input shaft 25 of the main gearbox to the second-gear main gear and the second-gear auxiliary gear, then to the intermediate shaft 21, the constantly meshing main gear and the constantly meshing auxiliary gear, and then to the left output shaft 22 and the right output shaft 23, and then transmitted to the left and right final drive boxes to achieve front-wheel drive; at the same time, power is input from the input shaft 25 of the main gearbox to the second-gear main gear and the second-gear auxiliary gear, then to the intermediate shaft 21, the spline sleeve 4, the input shaft 11 of the transfer case, multiple idler gears, the intermediate shaft 12 of the transfer case, the driving gear 121 and the driven gear 131, the drive shaft 13 of the transfer case, the first bevel gear 141 and the second bevel gear 142, and the output shaft 14 of the transfer case, and then to the rear drive axle assembly to achieve rear-wheel drive;

[0045] Third-gear power transmission route: Power is input from the input shaft 25 of the main gearbox to the third-gear main gear and the third-gear auxiliary gear, then to the intermediate shaft 21, the constantly meshing main gear and the constantly meshing auxiliary gear, and then to the left output shaft 22 and the right output shaft 23, and then transmitted to the left and right final drive boxes to achieve front-wheel drive; at the same time, power is input from the input shaft 25 of the main gearbox to the third-gear main gear and the third-gear auxiliary gear, then to the intermediate shaft 21, the spline sleeve 4, the input shaft 11 of the transfer case, multiple idler gears, and the intermediate shaft 12 of the transfer case. At this time, due to the presence of the third shifting gear hub 122 on the intermediate shaft 12 of the transfer case, the intermediate shaft 12 of the transfer case cannot be transmitted to the driving gear 121, so rear-wheel drive cannot be achieved.

[0046] Embodiment 2

[0047] The harvester in this embodiment includes the four-wheel drive gearbox with the drum-type parking brake and the drive shaft placed above in Embodiment 1.

[0048] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0049] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0050] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0051] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0052] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present 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, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0053] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A four-wheel drive transmission with a drum-type parking brake and an upper-mounted drive shaft, characterized in that: It includes a transfer case (1) and a driving case (2). The height of the rear end of the transfer case (1) is higher than that of its front end. Inside the transfer case (1), there are arranged, at intervals from front to back, a transfer case input shaft (11) extending in the left - right direction and rotatably assembled therewith, multiple idler shafts, a transfer case intermediate shaft (12), and a transfer case transmission shaft (13). On the transfer case input shaft (11), the multiple idler shafts, and the transfer case intermediate shaft (12), idlers are coaxially installed respectively, and adjacent idlers are meshed with each other. On the transfer case intermediate shaft (12), a driving gear (121) is coaxially installed in rotation. On the transfer case transmission shaft (13), a driven gear (131) meshing with the driving gear (121) is coaxially installed. On the transfer case intermediate shaft (12), a third shifting gear hub (122) is coaxially fixed. Along the axial direction, a shifting gear ring (123) which is connected or separated from the driving gear (121) is slidably installed on the third shifting gear hub (122). The right end of the transfer case input shaft (11) is connected to a drum - type parking brake (3). At the rear - end of the transfer case (1), a transfer case output shaft (14) extending in the front - rear direction is rotatably installed. The front end of the transfer case output shaft (14) is in transmission connection with the transfer case transmission shaft (13) through a transmission assembly. The driving case (2) is arranged in the left - front of the transfer case (1), and the right end of the intermediate shaft (21) of the driving case (2) is in coaxial transmission connection with the left end of the transfer case input shaft (11).

2. The four-wheel drive gearbox with the drum-type parking brake and the upper-mounted transmission shaft according to claim 1, characterized in that: There are two idler shafts.

3. The four-wheel drive gearbox with the drum-type parking brake and the upper-mounted transmission shaft according to claim 2, wherein: The height of the transfer case transmission shaft (13) is higher than that of the transfer case intermediate shaft (12), and the height of the transfer case intermediate shaft (12) is higher than that of an adjacent idler shaft.

4. The four-wheel drive gearbox with the drive shaft disposed above and having a drum-type parking brake according to claim 1, wherein: The transmission assembly includes a first bevel gear (141) and a second bevel gear (142) which are meshed with each other. The first bevel gear (141) is coaxially installed on the transfer case transmission shaft (13), and the second bevel gear (142) is coaxially installed at the front end of the transfer case output shaft (14).

5. The four-wheel drive gearbox with the drum-type parking brake and the upper-mounted drive shaft according to claim 1, characterized in that: At the right end of the intermediate shaft (21) of the driving case (2) and the left end of the transfer case input shaft (11), splines are respectively provided, and a spline sleeve (4) is externally key - connected to both of them. An external part of the spline sleeve (4) is sleeved with a transfer case connection seat (5), and the left and right ends of the transfer case connection seat (5) are respectively connected and fixed to the transfer case (1) and the driving case (2).

6. The four-wheel drive gearbox with the drive shaft arranged above and having a drum-type parking brake according to claim 1, characterized in that: The rear end of the transfer case (1) is curved upward in an arc shape from front to back.

7. A four-wheel drive gearbox with a drum-type parking brake and an upper-mounted drive shaft according to any one of claims 1 to 6, characterized in that: A left output shaft (22) and a right output shaft (23) coaxially distributed are rotatably mounted on the side walls at the left and right ends of the active case (2), and the ends of the left output shaft (22) and the right output shaft (23) close to each other are connected via a differential (24). The intermediate shaft (21) is arranged behind the left output shaft (22) and the right output shaft (23), and an active case input shaft (25) extending in the left and right directions is arranged behind the intermediate shaft (21). Both ends of the active case input shaft (25) are rotatably connected to the active case (2), and the intermediate shaft (21) and the active case input shaft (25) are transmission-connected via a multi-gear shift assembly, and the differential (24) is transmission-connected to the intermediate shaft (21) via a gear transmission assembly.

8. The four-wheel drive gearbox with the drive shaft disposed above and having a drum type parking brake according to claim 7, wherein: The multi-speed shift assembly comprises a first gear main gear and a first gear sub-gear meshing with each other, a second gear main gear and a second gear sub-gear meshing with each other, a third gear main gear and a third gear sub-gear meshing with each other, a first shift gear hub (26) and a second shift gear hub (27), wherein the first gear main gear and the second gear main gear are respectively coaxially fixedly mounted on the input shaft (25) of the driving box and are close to each other, the first gear sub-gear and the second gear sub-gear are respectively coaxially rotatably assembled on the intermediate shaft (21), the first shift gear hub (26) is coaxially fixedly mounted on the intermediate shaft (21) and is located between the first gear sub-gear and the second gear sub-gear, and the first A first gear ring gear is embedded outside the shift gear hub (26) and slides along its axial direction. The first gear ring gear slides axially to selectively connect with or disconnect from the first gear main gear and the second gear main gear. The third gear main gear is coaxially rotatably assembled on the input shaft (25) of the driving box. The third gear counter gear is coaxially fixedly mounted on the intermediate shaft (21). The second shift gear hub (27) is coaxially fixedly mounted on the input shaft (25) of the driving box and is close to the third gear main gear. A second gear ring gear is embedded outside the second shift gear hub (27) and slides along its axial direction. The second gear ring gear slides to connect with or disconnect from the third gear main gear.

9. The four-wheel drive gearbox with the drum-type parking brake and the upper-mounted transmission shaft according to claim 7, characterized in that: The gear transmission assembly comprises a constantly meshing main gear and a constantly meshing auxiliary gear that mesh with each other. The constantly meshing main gear is coaxially fixedly mounted on the intermediate shaft (21), and the constantly meshing auxiliary gear is coaxially mounted on the differential (24).

10. A harvesting machine, characterized in that: A four-wheel drive transmission with a drum parking brake mounted on a transmission shaft as claimed in any one of claims 1 to 9.

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