Paddy field tractor multi-speed steering transmission device

Abstract

The utility model provides a speed-multiplying steering transmission device of a paddy field tractor, which comprises a power gear shifting mechanism provided with a first output end; an input shaft of the main and auxiliary speed change mechanism is in transmission connection with the first output end of the power gear shifting mechanism, and an output shaft of the main and auxiliary speed change mechanism is in transmission connection with a central transmission mechanism; the output shaft of the main and auxiliary speed change mechanism is also provided with a front drive output gear; and the input end of the front-drive speed change mechanism is in transmission connection with the front-drive output gear. By the adoption of the double-speed steering device, gear shifting and speed changing are conducted by operating the front-drive speed changing mechanism, power of the output shafts of the main speed changing mechanism and the auxiliary speed changing mechanism can be transmitted to the front axle assembly after gear shifting and speed changing are conducted, obvious speed difference is generated between front drive and rear drive, double-speed steering is achieved, the turning radius of a tractor is greatly reduced, and the terrain adaptive capacity is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to tractor gearbox technical field, concretely relates to a paddy field tractor speed steering transmission device. BACKGROUND

[0002] With the development of tractor technology, power shift becomes the key technology that the enterprise pursues to improve competitiveness. The development core of power shift technology is to realize efficient transmission under the premise of uninterrupted power, which meets the demand of modern agriculture for efficiency, comfort and intelligentization, and lays a foundation for the application of subsequent CVT and hybrid power technology, therefore the application prospect of tractor power shift transmission device attracts much attention.

[0003] Compared with the traditional tractor plowing operation mode, in the paddy field operation process, because the land is small, the turning radius becomes an important index to judge the core competitiveness of the tractor, therefore the speed change function that can reduce the turning radius becomes the direction of the tractor enterprise to the international benchmark. UTILITARIAN CONTENT

[0004] The technical problem to be solved by the utility model is: how to reduce the turning radius of the paddy field tractor.

[0005] The technical scheme for solving the above technical problem of the utility model is as follows:

[0006] The utility model provides a paddy field tractor speed steering transmission device, which comprises:

[0007] A power shift mechanism is provided with a first output end;

[0008] A main and auxiliary speed change mechanism is provided with a first output end;

[0009] A front drive speed change mechanism is provided with a first output end.

[0010] The utility model has the advantages of:

[0011] The utility model is adopted, the front drive speed change mechanism obtains power from the output shaft of the main and auxiliary speed change mechanism, and the power of the output shaft of the main and auxiliary speed change mechanism is transmitted to the front axle assembly after gear shift and speed change, so that the front drive and the rear drive have obvious speed difference, speed steering is realized, the turning radius of the tractor is greatly reduced, and the terrain adaptability is improved.

[0012] On the basis of the above technical scheme, the utility model still can make following improvement.

[0013] Further, the front drive speed change mechanism comprises a front drive speed change shaft and a front drive output shaft, the front drive speed change shaft is provided with a front drive high speed gear and a front drive low speed gear, the front drive output shaft is provided with a front drive high speed clutch and a front drive low speed clutch, the front drive high speed clutch is engaged with the front drive high speed gear, and the front drive low speed clutch is engaged with the front drive low speed gear.

[0014] When the front drive low speed clutch works, the front drive output shaft can output a normal rotating speed, so that four-wheel driving is facilitated.

[0015] Further, the front drive high speed clutch and the front drive low speed clutch are both wet clutches.

[0016] The gear shifting is realized through the wet clutches, so that the operation comfort is improved.

[0017] Further, the transmission ratio from the front drive output gear to the front drive low speed clutch is 1:1.

[0018] When the front drive low speed clutch works, the rotating speed of the front drive output shaft is the same as the rotating speed of the output shaft of the main and auxiliary speed change mechanisms, so that the normal four-wheel driving is adapted.

[0019] Further, the power gear shifting mechanism comprises a power input shaft, a power output shaft and a reversing idler shaft, the power input shaft is provided with a reversing gear, a power low gear and a power high clutch, the power output shaft is provided with a reversing clutch, a power low clutch and a power high gear, the reversing clutch and the reversing gear are engaged with idlers on the reversing idler shaft respectively, the power low clutch is engaged with the power low gear, and the power high clutch is engaged with the power high gear.

[0020] When the reversing clutch is closed, the power of the power input shaft is reversed through the reversing idler shaft, is transmitted to the power output shaft through the reversing clutch, and the reverse gear is realized.

[0021] Further, one end of the power input shaft is also provided with a hydraulic output gear; the power gear shifting mechanism further comprises a hydraulic power take-off shaft, and the hydraulic power take-off shaft is drivingly connected with the hydraulic output gear through an idler.

[0022] The hydraulic pump of the hydraulic system can obtain power from the hydraulic power take-off shaft, so that the hydraulic pump can be mounted on the external shell of the utility model, and the hydraulic pump used for steering and lifting on the traditional tractor can be mounted on the engine, the hydraulic pipeline of the engine compartment is reduced, the pipeline arrangement is more simple, and the maintenance cost is low.

[0023] Further, one end of the hydraulic power take-off shaft is provided with a hydraulic power take-off port, and the hydraulic power take-off port is provided with an internal spline.

[0024] The input shaft of the hydraulic pump can be inserted into the hydraulic power take-off port and engaged with the internal spline, so that the hydraulic pump is convenient to install, the transmission is reliable, and the hydraulic pump is convenient to obtain power from the hydraulic power take-off shaft.

[0025] Further, the output shaft of the main and auxiliary transmission mechanism is further provided with a parking brake.

[0026] The parking brake is convenient to park, the central transmission mechanism and the front drive transmission mechanism are all without power input through the output shaft of the main and auxiliary transmission mechanism, and the parking brake of the front wheel and the rear wheel is realized.

[0027] Further, the main and auxiliary transmission mechanism comprises a main transmission shaft, an auxiliary transmission shaft and an intermediate shaft, the main transmission shaft is provided with a first main transmission gear pair, the auxiliary transmission shaft is provided with an auxiliary transmission gear pair, and the first main transmission gear pair and the auxiliary transmission gear pair are respectively in transmission connection with the intermediate shaft.

[0028] The main transmission shaft is the input shaft of the main and auxiliary transmission mechanism, and the auxiliary transmission shaft is the output shaft of the main and auxiliary transmission mechanism.

[0029] Through the three-shaft main and auxiliary transmission cooperation, the total gear number is at least twice of the main transmission gear number, the gear number is increased, and various speed output capacities can be matched.

[0030] Further, the intermediate shaft is further provided with a second transmission gear pair, and the second transmission gear pair is in transmission connection with the main transmission shaft.

[0031] Through the cooperation of the first main transmission gear pair and the second transmission gear pair, the gear stacking is realized, and the structure is compact. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a structural schematic view of the utility model.

[0033] In the drawings, the technical features represented by the reference numerals are as follows:

[0034] 1-power shift mechanism; 11-power input shaft; 12-power output shaft; 13-reversing idler shaft; 14-reversing gear; 15-reversing clutch; 16-power low gear; 17-power high clutch; 18-power low clutch; 19-power high gear;

[0035] 2 - main and auxiliary transmission mechanism; 20 - parking brake; 21 - main transmission shaft; 22 - auxiliary transmission shaft; 23 - intermediate shaft; 24 - movable gear; 25 - main transmission synchronizer; 26 - fixed gear;

[0036] 3 - central transmission mechanism; 4 - final transmission mechanism; 5 - PTO clutch;

[0037] 6 - PTO transmission mechanism; 61 - PTO transmission shaft; 62 - PTO gear; 63 - PTO synchronizer; 64 - PTO multi-gear;

[0038] 7 - PTO output mechanism; 71 - PTO driving gear; 72 - PTO driven gear; 73 - PTO output shaft;

[0039] 8 - hydraulic power take-off shaft; 81 - hydraulic output gear;

[0040] 9 - front drive transmission mechanism; 91 - front drive output gear; 92 - front drive transmission shaft; 93 - front drive output shaft; 94 - front drive high-speed clutch; 95 - front drive low-speed clutch. DETAILED DESCRIPTION

[0041] The principles and characteristics of the utility model are described below, and the examples are only used to explain the utility model and are not used to limit the scope of the utility model.

[0042] The utility model refers to Figure 1 .

[0043] The utility model provides a paddy field tractor speed-changing steering transmission device, comprising:

[0044] Power gear shifting mechanism 1, the first output end is equipped on the power gear shifting mechanism 1;

[0045] Main and auxiliary transmission mechanism 2, the input shaft of main and auxiliary transmission mechanism 2 is transmissionally coupled with the first output end of the power gear shifting mechanism 1, and the output shaft of main and auxiliary transmission mechanism 2 is transmissionally coupled with central transmission mechanism 3;The output shaft of main and auxiliary transmission mechanism 2 is also equipped with front drive output gear 91;

[0046] Front drive transmission mechanism 9, the input end of front drive transmission mechanism 9 is transmissionally coupled with the front drive output gear 91.

[0047] Principle:

[0048] When assembled, the central transmission mechanism 3 is generally located in the rear axle housing of the tractor, and two output ends of the central transmission mechanism 3 are connected with one final transmission mechanism 4 respectively, and the final transmission mechanism 4 is used for connecting the rear wheel. The central transmission mechanism 3 and the final transmission mechanism 4 are the general names in the prior art (the final transmission mechanism 4 is also called a half shaft assembly), and the technical problems to be solved by the utility model do not involve the specific structures of the two, and will not be described in detail. The output shaft of the front drive transmission mechanism 9 is in transmission connection with the front axle assembly of the four-wheel drive tractor, the front axle assembly is used for connecting the front wheel, and the structure of the front axle assembly of the four-wheel drive tractor belongs to the prior art product, and does not involve the technical problems to be solved by the utility model.

[0049] When working, the engine power is output to the power shift mechanism 1, power direction is changed by operating the power shift mechanism 1, and multi-gear shifting is performed by operating the main and auxiliary transmission mechanism 2, so that the output shaft of the main and auxiliary transmission mechanism 2 can output forward multi-gear rotation speed and reverse multi-gear rotation speed to the central transmission mechanism 3, and the forward and reverse movement of the tractor can be operated in multiple gears. When the front drive transmission mechanism 9 works, the front drive transmission mechanism 9 obtains power from the front drive output gear 91 on the output shaft of the main and auxiliary transmission mechanism 2 and transmits the power to the front axle assembly, so that the four-wheel drive mode can be realized, and the turning radius is reduced. By operating the front drive transmission mechanism 9 to shift gears, when turning in the working place, the front drive and the rear drive can realize multiple differential speed (i.e. multiple speed turning), and the turning radius is significantly reduced.

[0050] By adopting the utility model, the front drive transmission mechanism 9 obtains power from the output shaft of the main and auxiliary transmission mechanism 2, and the power of the output shaft of the main and auxiliary transmission mechanism 2 is shifted and transmitted to the front axle assembly after shifting and speed changing, so that the front drive and the rear drive have obvious speed difference, multiple speed turning is realized, the turning radius of the tractor is greatly reduced, and the terrain adaptability is improved; and the utility model is suitable for paddy field operation environment.

[0051] Further, the front drive transmission mechanism 9 comprises a front drive transmission shaft 92 and a front drive output shaft 93, the front drive transmission shaft 92 is provided with a front drive high-speed gear and a front drive low-speed gear, the front drive output shaft 93 is provided with a front drive high-speed clutch 94 and a front drive low-speed clutch 95, the front drive high-speed clutch 94 is in mesh with the front drive high-speed gear, and the front drive low-speed clutch 95 is in mesh with the front drive low-speed gear; and the front drive low-speed gear is in mesh with the front drive output gear 91.

[0052] When the front drive low-speed clutch 95 works, the front drive output shaft 93 can output normal rotation speed, and four-wheel drive travel is facilitated; when the front drive high-speed clutch 94 works, multiple speed transmission is performed through the front drive high-speed clutch 94 and the front drive high-speed gear, the rotation speed of the front drive output shaft 93 is greatly increased, the front wheel can be rotated more quickly during turning, and the turning radius is reduced.

[0053] Further, the front-drive high-speed clutch 94 and the front-drive low-speed clutch 95 are both wet clutches.

[0054] The shift is realized by the wet clutch, and the operation comfort is improved.

[0055] Further, the transmission ratio of the front-drive output gear 91 to the front-drive low-speed clutch 95 is 1:1.

[0056] When the front-drive low-speed clutch 95 works, the rotating speed of the front-drive output shaft 93 is the same as that of the output shaft of the main and auxiliary transmission mechanism 2, so that the conventional four-wheel driving is adapted.

[0057] Further, the power shift mechanism 1 comprises a power input shaft 11, a power output shaft 12 and a reversing idler shaft 13, the power input shaft 11 is provided with a reversing gear 14, a power low-gear gear 16 and a power high-gear clutch 17, the power output shaft 12 is provided with a reversing clutch 15, a power low-gear clutch 18 and a power high-gear gear 19, the reversing clutch 15 and the reversing gear 14 are respectively engaged with idlers on the reversing idler shaft 13, the power low-gear clutch 18 is engaged with the power low-gear gear 16, and the power high-gear clutch 17 is engaged with the power high-gear gear 19.

[0058] Note: one end of the power output shaft 12 is the first output end of the power shift mechanism 1, and one end of the power input shaft 11 is the second output end of the power shift mechanism 1.

[0059] When the reversing clutch 15 is closed, the power of the power input shaft 11 is reversed through the reversing idler shaft 13 and then transmitted to the power output shaft 12 through the reversing clutch 15, so that the reverse gear is realized; when the reversing clutch 15 is disconnected, the high-low gear shift is realized through the power high-gear clutch 17 and the power low-gear clutch 18; under the joint action of the main and auxiliary transmission mechanism 2, the gear shift capability is greatly increased, and various road conditions and site operations can be adapted.

[0060] Further, one end of the power input shaft 11 is also provided with a hydraulic output gear 81; and the hydraulic power take-off shaft 8 is coupled with the hydraulic output gear 81 through an idler.

[0061] Note: one end of the power input shaft 11 is the second output end of the power shift mechanism 1. Specifically, the hydraulic power take-off shaft 8 is provided with a hydraulic power take-off gear, the hydraulic power take-off gear is engaged with an idler, and the idler is engaged with the hydraulic output gear 81.

[0062] The hydraulic pump of the hydraulic system can obtain power from the hydraulic power take-off shaft 8, so that the hydraulic pump can be installed on the external shell of the utility model, and the scheme that the hydraulic pump used for steering and lifting on the conventional tractor is installed on the engine can be replaced, the hydraulic pipeline in the engine compartment is reduced, the pipeline arrangement is more simple, and the maintenance cost is low.

[0063] Further, one end of the hydraulic power take-off shaft 8 is provided with a hydraulic power take-off port, and the hydraulic power take-off port is provided with an internal spline.

[0064] The input shaft of the hydraulic pump can be inserted into the hydraulic power take-off port and engaged with the internal spline, which is convenient to install and has good transmission reliability, and the hydraulic pump can obtain power from the hydraulic power take-off shaft 8.

[0065] Further, the output shaft of the main and auxiliary transmission mechanism 2 is further provided with a parking brake 20.

[0066] It is convenient to park and stop, and the output shaft of the main and auxiliary transmission mechanism 2 is braked, and the central transmission mechanism 3 and the front drive transmission mechanism 9 are all without power input, so as to realize the parking brake of the front wheels and the rear wheels.

[0067] Further, the main and auxiliary transmission mechanism 2 comprises a main transmission shaft 21, an auxiliary transmission shaft 22 and an intermediate shaft 23, the main transmission shaft 21 is provided with a first main transmission gear pair, the auxiliary transmission shaft 22 is provided with an auxiliary transmission gear pair, and the first main transmission gear pair and the auxiliary transmission gear pair are respectively in transmission connection with the intermediate shaft 23.

[0068] Among them, the main transmission shaft 21 is the input shaft of the main and auxiliary transmission mechanism 2; the auxiliary transmission shaft 22 is the output shaft of the main and auxiliary transmission mechanism 2.

[0069] Preferably, the first main transmission gear pair and the auxiliary transmission gear pair each comprise two movable gears 24, the two movable gears 24 of the first main transmission gear pair are provided with a main transmission synchronizer 25, the two movable gears 24 of the auxiliary transmission gear pair are provided with a meshing sleeve, and the auxiliary transmission shaft 22 is provided with a plurality of fixed gears 26, each movable gear 24 is in corresponding engagement with a fixed gear 26.

[0070] Through the cooperation of the three-shaft main and auxiliary transmission, the total number of gears is at least twice the number of main transmission gears, the number of gears is increased, and a variety of speed output capabilities can be matched.

[0071] Further, the intermediate shaft 23 is further provided with a second transmission gear pair, and the second transmission gear pair is in transmission connection with the main transmission shaft 21.

[0072] Preferably, the first main transmission gear pair has two pairs, the second transmission gear pair has one pair, and the auxiliary transmission gear pair has one pair. 12-gear transmission is realized. The second transmission gear pair comprises two movable gears 24, and the two movable gears 24 are provided with a main transmission synchronizer 25; the main transmission shaft 21 is provided with a plurality of fixed gears 26, and each movable gear 24 of the second transmission gear pair is in corresponding engagement with a fixed gear 26 on the main transmission shaft 21.

[0073] Through the cooperation of the first main transmission gear pair and the second transmission gear pair, the gear stacking is realized, and the structure is compact.

[0074] Preferably, the power shift mechanism 1 is further provided with a second output end; further comprising:

[0075] a PTO clutch 5, an input end of the PTO clutch 5 being in driving connection with the second output end of the power shift mechanism 1;

[0076] a PTO shift mechanism 6, an input end of the PTO shift mechanism 6 being in driving connection with an output end of the PTO clutch 5, and an output end of the PTO shift mechanism 6 being in driving connection with a PTO output mechanism 7.

[0077] The PTO clutch 5 directly obtains power from the second output end of the power shift mechanism 1, abandoning the scheme of obtaining power from the central transmission mechanism 3, and the PTO assembly does not need to be arranged on the rear axle housing, thereby saving the length direction space of the tractor, so as to arrange the PTO clutch 5 and the PTO shift mechanism 6. Through operation of the PTO shift mechanism 6, multi-gear shifting is realized, and the PTO output mechanism 7 is provided with multi-gear shifting, thereby increasing the output speed change ability of the tractor PTO, and adapting to the demand of PTO forward and reverse rotation and various power output functions.

[0078] The PTO clutch 5 obtains power from the second output end of the power shift mechanism 1, saves the length direction space of the tractor, and provides arrangement space for the PTO clutch 5 and the PTO shift mechanism 6; through the PTO shift mechanism 6, the output speed change ability of the tractor PTO is increased, and the tractor PTO can be applied to various PTO operation modes; in addition, through the power shift mechanism 1 and the main and auxiliary transmission mechanisms 2, power reversing and speed shifting are superimposed, so that multi-gear operation can be performed when the tractor is moving forward and backward, and the functionality is improved.

[0079] Further, the PTO shift mechanism 6 comprises a PTO shift shaft 61 and a PTO multi-connection gear 64, a plurality of PTO gear wheels 62 are movably sleeved on the PTO shift shaft 61, each PTO gear wheel 62 is in meshing connection with the PTO multi-connection gear 64, one of the PTO gear wheels 62 is in driving connection with the output end of the PTO clutch 5; one side of the PTO gear wheel 62 is provided with a PTO synchronizer 63; the PTO shift shaft 61 is the output end of the PTO shift mechanism 6.

[0080] Preferably, the PTO multi-connection gear 64 is a four-connection gear, and the PTO gear wheels 62 are four in total. The four-speed change PTO output is realized.

[0081] The PTO synchronizer 63 can link any one of the PTO gear 62 with the PTO variable speed shaft 61; through one of the PTO gear 62 from the output end of the PTO clutch 5 to obtain power, and then transmitted to the PTO multi-connection gear 64, the different parts of the PTO multi-connection gear 64 will transmit power to the remaining PTO gear 62, so that each PTO gear 62 has different rotating speed; thus, when any one of the PTO gear 62 is linked with the PTO variable speed shaft 61 through the PTO synchronizer 63, the PTO variable speed shaft 61 can obtain the corresponding rotating speed, realizing the multi-gear change of the PTO output, increasing the output rotating speed change ability of the tractor PTO, and being applicable to various PTO operation modes.

[0082] Further, the middle part of one of the PTO gear 62 transmissionally coupled with the output end of the PTO clutch 5 is provided with a power take-off shaft section, the power take-off shaft section extends into the output end of the PTO clutch 5 and is transmissionally coupled, and the power take-off shaft section is coaxially arranged with the PTO variable speed shaft 61.

[0083] Note: the power take-off shaft section can be a section separated from the PTO variable speed shaft 61, or can be a hub of the PTO gear 62.

[0084] The power take-off shaft section and the output end of the PTO clutch 5 can be transmissionally coupled through splines, which is convenient to install and improves the reliability of the transmission between the PTO clutch 5 and the PTO gear 62.

[0085] Further, every two PTO gears 62 are arranged in pairs, and one PTO synchronizer 63 is arranged between the two PTO gears 62 arranged in pairs.

[0086] The number of PTO synchronizers 63 is saved, the structure is compact, and the cost is reduced.

[0087] Further, the PTO multi-connection gear 64 is movably sleeved on the output shaft of the main and auxiliary transmission mechanism 2.

[0088] Preferably, the PTO multi-connection gear 64 is connected with the output shaft of the main and auxiliary transmission mechanism 2 through a bearing.

[0089] The output shaft of the main and auxiliary transmission mechanism 2 provides installation space for the PTO multi-connection gear 64, without the need to separately set a shaft for the PTO multi-connection gear 64, thereby reducing the volume and weight of the whole machine and facilitating the lightweight design of the whole machine.

[0090] Further, the PTO output mechanism 7 comprises a PTO driving gear 71 and a PTO output shaft 73, the PTO driving gear 71 is sleeved on the PTO transmission shaft 61, the PTO output shaft 73 is sleeved with a PTO driven gear 72, the PTO driven gear 72 is engaged with the PTO driving gear 71, and the PTO output shaft 73 is further provided with a special composite oil seal for paddy field.

[0091] Compact structure, convenient to install, good reliability, through the special composite oil seal for paddy field, convenient to adapt to paddy field operation.

[0092] In the description of the utility model, it is understood that if the description of the direction, direction or position relationship appears, for example: "center", "vertical", "horizontal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", the direction or position relationship indicated in the specification is based on the direction or position relationship shown in the drawing, only for the convenience of understanding the utility model and simplifying the description, and it is not indicated or implied that the indicated part, element or whole must have a particular direction, structure and operation, therefore, it cannot be understood as the limitation of the utility model.

[0093] In addition, if the order description language appears, for example: "first", "second" and the like, the use in the specification is for the convenience of understanding or simplifying the description, for example, in order to distinguish a plurality of technical features with the same type or function, and it is necessary to mention separately, the specification may adopt the way of prefix or suffix order description language to distinguish them. Therefore, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature. In the description of the utility model, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0094] In the utility model, if the structure relative action relation description language is used, for example: "installation", "connection", "connection", "fixing" and the like, unless there is definite stipulation and limitation, otherwise should do the broad sense understanding. For example, "installation", "connection", "connection" and the like, can be fixed connection, also can be detachable connection, or integrated; can be mechanical connection, also can be electrical connection; can be directly connected, also can be indirectly connected through intermediate medium, can be the intercommunication of two elements or the interaction of two elements; "fixing" can be integrated fixing, also can be detachable fixing through fastener; can be direct fixing, also can be fixed through intermediate medium. For the ordinary skilled in the art, the specific meaning of the above description language in the utility model can be understood according to specific circumstances, context, the coherence of the preceding and following texts and the like.

[0095] In the utility model, if the description language containing accessory or connection meaning appears, for example, the first feature is "on" or "under" the second feature, unless there is definite stipulation and limitation, otherwise should not be limitedly understood, for example, "on" or "under" can be that the first and second features directly contact, also can be that the first feature and the second feature indirectly contact through intermediate medium. For the ordinary skilled in the art, the specific meaning of the above description language in the utility model can be understood according to specific circumstances, context, the coherence of the preceding and following texts and the like.

[0096] Further, the first feature is "on", "above" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature. The first feature is "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0097] In the description of the specification, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" 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 the specification, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments, examples and features of different embodiments, examples described in the specification without contradiction, which should be included in the range of the utility model.

[0098] Although the above has shown and described the embodiments of the present application, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and within the scope of information available to the public, the changes, modifications, replacements and variations of the above embodiments made by the ordinary skilled in the art in combination with the technical inspiration given by the present application document can still be covered within the protection scope of the present application.

Claims

1. A paddy field tractor speed change steering transmission device characterized by comprising: The application relates to a power shift mechanism (1) provided with a first output end. A main and auxiliary transmission mechanism (2) is transmissionally connected with the first output end of the power shift mechanism (1), and the output shaft of the main and auxiliary transmission mechanism (2) is transmissionally connected with a central transmission mechanism (3); a front drive output gear (91) is further arranged on the output shaft of the main and auxiliary transmission mechanism (2). A front drive transmission mechanism (9) is transmissionally connected with the front drive output gear (91). The front drive transmission mechanism (9) comprises a front drive transmission shaft (92) and a front drive output shaft (93), the front drive transmission shaft (92) is provided with a front drive high-speed gear and a front drive low-speed gear, the front drive output shaft (93) is provided with a front drive high-speed clutch (94) and a front drive low-speed clutch (95), the front drive high-speed clutch (94) is meshed with the front drive high-speed gear, the front drive low-speed clutch (95) is meshed with the front drive low-speed gear, and the front drive low-speed gear is meshed with the front drive output gear (91).

2. The paddy field tractor gear shift steering transmission device according to claim 1, characterized by: The front drive high-speed clutch (94) and the front drive low-speed clutch (95) are both wet clutches.

3. The paddy field tractor gearless steering transmission device according to claim 2, characterized by: The transmission ratio from the front drive output gear (91) to the front drive low-speed clutch (95) is 1:

1.

4. The paddy field tractor gear shift steering transmission device according to claim 2, characterized by: The power shift mechanism (1) comprises a power input shaft (11), a power output shaft (12) and a reversing idler shaft (13), the power input shaft (11) is provided with a reversing gear (14), a power low-gear (16) and a power high-gear clutch (17), the power output shaft (12) is provided with a reversing clutch (15), a power low-gear clutch (18) and a power high-gear (19), the reversing clutch (15) and the reversing gear (14) are respectively meshed with idlers on the reversing idler shaft (13), the power low-gear clutch (18) is meshed with the power low-gear (16), and the power high-gear clutch (17) is meshed with the power high-gear (19).

5. The paddy field tractor gearless steering transmission device according to claim 1, characterized by: One end of the power input shaft (11) is further provided with a hydraulic output gear (81); a hydraulic power take-off shaft (8) is further arranged and transmissionally connected with the hydraulic output gear (81) through idlers.

6. The paddy field tractor gearless steering transmission device according to claim 5, characterized by: One end of the hydraulic power take-off shaft (8) is provided with a hydraulic power take-off port, and the hydraulic power take-off port is provided with an internal spline.

7. The paddy field tractor gearless steering transmission device according to claim 6, characterized by: The output shaft of the main and auxiliary transmission mechanism (2) is further provided with a parking brake (20).

8. The paddy field tractor gearless steering transmission device according to claim 1, characterized by: The main and auxiliary transmission mechanism (2) comprises a main transmission shaft (21), an auxiliary transmission shaft (22) and an intermediate shaft (23), the main transmission shaft (21) is provided with a first main transmission gear pair, the auxiliary transmission shaft (22) is provided with an auxiliary transmission gear pair, and the first main transmission gear pair and the auxiliary transmission gear pair are respectively transmissionally connected with the intermediate shaft (23).

9. The paddy field tractor creeking transmission device according to claim 1, characterized in that: The main transmission shaft (21) is the input shaft of the main and auxiliary transmission mechanism (2), and the auxiliary transmission shaft (22) is the output shaft of the main and auxiliary transmission mechanism (2). The intermediate shaft (23) is further provided with a second transmission gear pair, and the second transmission gear pair is transmissionally connected with the main transmission shaft (21).

10. The paddy field tractor gearless steering transmission according to claim 9, characterized in that: ​

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