Grain pulling and ear picking gearbox

Abstract

The utility model provides a rice pulling and ear picking gearbox which comprises a shell, a main conduction shaft, an ear picking output shaft and a rice pulling output shaft, the middle of the main conduction shaft is located in the shell, and one end of the rice pulling output shaft extends into the shell from the top wall of the shell and is connected with the main conduction shaft; the main transmission shaft is sleeved with an elastic torque limiter, the elastic torque limiter is connected with a transfer gear, and one end of the ear picking output shaft extends into the shell from the front side wall of the shell and is connected with the transfer gear; when the transfer gear is overloaded, the elastic torque limiter can elastically disconnect transmission between the main transmission shaft and the transfer gear. According to the utility model, the main transmission shaft and the transfer gear are in transmission through the elastic torque limiter, and when the ear picking output shaft is overloaded, the elastic torque limiter elastically disconnects the transmission, so that the seedling pulling and ear picking gear box and a power bearing part thereof are effectively protected; the structure is compact, and the grain pulling and ear picking gearbox is small in size.

Description

Technical Field

[0001] The utility model relates to the technical field of harvester gear boxes, in particular to a harvester gear box for plowing and picking ears of grain. Background Art

[0002] The hoe-pulling and ear-picking gearbox is a working component on the corn kernel cutting table of the wheat machine. Its main function is to provide power for the hoe-pulling chain, ear-picking roller and other components of the cutting table to achieve the harvesting of corn stalks and the picking of corn ears.

[0003] At present, the mainstream wheat harvesting and ear picking gearboxes used on corn grain harvesters generally do not take torque limiting measures. When the working parts such as the ear picking rollers are stuck by foreign objects, it is easy to cause the teeth of the wheat harvesting and ear picking gearbox to be damaged, or the power continues to be output, causing damage to the working parts. Regarding torque limiting measures, mainstream gearboxes generally install vulnerable parts or safety clutches on the transmission structure between the main input shaft and the output shaft to achieve the purpose of torque limiting. Vulnerable parts have destructive factors. When stuck and overloaded, they are damaged and need to be replaced before they can work again, affecting the user's harvesting efficiency. The safety clutch has a complex structure and a bulky appearance, while the installation space of the wheat harvesting and ear picking gearbox is limited. The two are not suitable for combination. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to effectively protect the plowing and ear picking gear box and its power receiving part under the working condition that foreign matter is stuck in the working part.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] The utility model provides a straw plucking gear box, comprising a shell, a main conduction shaft, an ear plucking output shaft, and a straw plucking output shaft. The middle portion of the main conduction shaft is located in the shell, and one end of the straw plucking output shaft extends from the top wall of the shell into the shell and is connected to the main conduction shaft; an elastic torque limiter is sleeved on the main conduction shaft, and a transfer gear is connected to the elastic torque limiter; one end of the ear plucking output shaft extends from the front side wall of the shell into the shell and is connected to the transfer gear; when the transfer gear is overloaded, the elastic torque limiter can elastically disconnect the transmission between the main conduction shaft and the transfer gear.

[0007] The beneficial effects of the utility model are:

[0008] With the utility model, the main transmission shaft and the transfer gear are transmitted through the elastic torque limiter. When the ear picking output shaft is overloaded, the elastic torque limiter elastically disconnects the transmission, effectively protecting the plucking and ear picking gearbox and its power receiving part; the ear picking output shaft extends from a side wall of the shell, and is in the same direction as the axial direction of the ear picking roller when installed, and the plucking output shaft extends upward and is the same as the axial direction of the plucking sprocket. The intermediate transmission structure is simple and compact, and the plucking and ear picking gearbox is small in size.

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

[0010] Furthermore, the elastic torque limiter includes a hub and an elastic unit, the hub is sleeved on the main transmission shaft, and the outer periphery of the hub is connected to the intermediate gear; a torque limiting groove is provided on the inner side of the hub, one end of the elastic unit is connected to the main transmission shaft, and the other end is inserted into the torque limiting groove; when the hub and the elastic unit are subjected to relative force along the circumference of the hub, the torque limiting groove generates a component force on the elastic unit along the axial direction of the elastic unit.

[0011] When the main transmission shaft and the hub are transmitting, the force of the main transmission shaft is transmitted to the hub through the elastic unit, so that there is a relative force between the hub and the elastic unit along the circumference of the hub; when the ear picking output shaft and its working part are overloaded, the resistance of the driving hub is too large, and the torque limiting groove increases the component force of the elastic unit along the axial direction of the elastic unit, thereby overcoming the elastic force of the elastic unit, causing the elastic unit to exit the torque limiting groove, and realizing elastic cutting off of transmission; when the overload disappears, the elastic unit enters the torque limiting groove under the action of its own elastic force, and can also transmit to the transfer gear, and can automatically reset, saving the cost of manual reset.

[0012] Furthermore, the elastic units are provided in multiple groups, and the multiple groups of elastic units are arranged along the axial direction of the main conduction shaft, and multiple elastic units in the same group are evenly distributed along the circumference of the main conduction shaft.

[0013] It is convenient to disperse the transmission torque from the main transmission shaft to the wheel hub, the force is evenly distributed and the service life is long.

[0014] Furthermore, the main conduction shaft is provided with a guide groove, and each of the elastic units extends into a guide groove.

[0015] The distance from the outer side of the main conduction shaft to the inner side of the hub is reduced, the exposed length of the elastic unit is small, and the elastic unit is prevented from being disintegrated or failing due to deformation by bending moment, thereby improving reliability.

[0016] Furthermore, the elastic unit includes a spring seat and an elastic member both located in the guide groove, one end of the elastic member abuts the bottom of the guide groove, and the other end abuts one end of the spring seat, and the other end of the spring seat extends out of the guide groove and is inserted into the torque limiting groove of the wheel hub.

[0017] The elastic member provides elastic force to the spring seat, and the guide groove guides the spring seat. When overloaded, the spring seat retracts into the guide groove; when the overload disappears, the elastic force of the elastic member resets the spring seat, which has good reliability.

[0018] Furthermore, one end of the spring seat facing the elastic member is cylindrical, and the other end of the elastic member extends into the spring seat.

[0019] The spring seat and the elastic member partially overlap, which improves the stability of the two. At the same time, the space occupied by the two is small, which reduces the depth required for the guide groove and reduces the strength weakening effect of the guide groove on the main conduction shaft.

[0020] Furthermore, the other end of the spring seat is provided with a long strip-shaped protrusion, the length direction of the protrusion is the axial direction of the wheel hub, and the protrusion is inserted into the torque limiting groove of the wheel hub; the top of the protrusion is arc-shaped, and the two sides of the protrusion are inclined surfaces, and the two sides of the protrusion are rounded transitions to the end of the spring seat.

[0021] The wheel hub is driven by the long strip-shaped raised portion, which has a large contact surface and reduces stress. The top arc shape, the inclined surfaces on both sides and the rounded corner transition of the raised portion facilitate the torque limiting groove to generate a component force on the raised portion along the axial direction of the spring seat, so that the raised portion can exit the torque limiting groove.

[0022] Furthermore, a groove is provided on the top of the raised portion, and notches on both sides of the groove are arc-shaped.

[0023] This helps reduce the contact area between the raised portion and the wheel hub, thereby reducing wear when the two slide relative to each other.

[0024] Furthermore, in a cross section perpendicular to the hub axis, the torque limiting groove is in an arc shape.

[0025] This facilitates generating a component force on the elastic unit along the axial direction of the spring seat, so that the elastic unit can exit the torque limiting groove.

[0026] Furthermore, the transfer gear is a double bevel gear, there are two ear picking output shafts and they are located on both sides of the double bevel gear, and one end of the ear picking output shaft extending into the housing is provided with a first bevel gear, and the first bevel gear is meshed with the double bevel gear.

[0027] The two first bevel gears can be driven to rotate in opposite directions by the double bevel gears, so as to provide power for the two ear picking output shafts to rotate in opposite directions.

[0028] Furthermore, a bed knife connecting shaft is provided on the front side wall of the shell, and the bed knife connecting shaft is connected to the ear picking output shaft through a gear set.

[0029] The bed knife connecting shaft is used to connect and drive the bed knife under the ear picking roller, and has a compact structure. When the bed knife is stuck and overloaded, the elastic torque limiter can disconnect the transmission to avoid damage to the bed knife.

[0030] Furthermore, there are two plowing output shafts, and a second bevel gear is provided at the lower end of the plowing output shaft. Two third bevel gears are provided on the main transmission shaft, and the small ends of the two third bevel gears are arranged opposite to each other. Each second bevel gear corresponds to and meshes with a third bevel gear.

[0031] The small ends of the two third bevel gears are arranged opposite to each other, and can drive the two second bevel gears to rotate in opposite directions, so as to provide power for the two reel sprockets to rotate in opposite directions.

[0032] Furthermore, a top cover is provided on the top wall of the shell, and both the shell and the top cover are made of gravity-cast aluminum material with the grade ZL101A.

[0033] While ensuring the strength of individual parts and assemblies, the total weight of parts and assemblies is reduced by one third, and the processing accuracy and cleanliness of parts are greatly improved, ensuring the connection strength and reducing the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a front view of the utility model.

[0035] Figure 2 for Figure 1 AA section view.

[0036] Figure 3 for Figure 1 Top view of .

[0037] Figure 4 for Figure 3 BB cross-sectional view.

[0038] Figure 5 Schematic diagram of the structure of the elastic torque limiter.

[0039] Figure 6 for Figure 5 Detail of Section D.

[0040] Figure 7 Schematic diagram of the structure of the spring seat.

[0041] Figure 8 It is a three-dimensional view of the present invention.

[0042] In the accompanying drawings, the technical features represented by the reference numerals are as follows:

[0043] 1-housing; 2-main transmission shaft; 21-guide groove; 3-ear picking output shaft; 4-sowing output shaft; 41-sowing sprocket; 5-elastic torque limiter; 51-wheel hub; 52-elastic unit; 521-spring seat; 522-elastic member; 523-protrusion; 524-groove; 53-torque limiting groove; 6-transfer gear; 7-first bevel gear; 8-second bevel gear; 9-third bevel gear; 10-output gear; 11-bed knife connecting shaft; 12-input gear; 13-idler gear. DETAILED DESCRIPTION

[0044] 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.

[0045] This utility model refers to Figure 1-8 .

[0046] The utility model provides a plowing and ear-picking gear box, comprising a shell 1, a main conduction shaft 2, an ear-picking output shaft 3, and a plowing output shaft 4. The middle portion of the main conduction shaft 2 is located in the shell 1, and one end of the plowing output shaft 4 extends from the top wall of the shell 1 into the shell 1 and is connected to the main conduction shaft 2; an elastic torque limiter 5 is sleeved on the main conduction shaft 2, and a transfer gear 6 is connected to the elastic torque limiter 5; one end of the ear-picking output shaft 3 extends from the front side wall of the shell 1 into the shell 1 and is connected to the transfer gear 6; when the transfer gear 6 is overloaded, the elastic torque limiter 5 can elastically disconnect the transmission between the main conduction shaft 2 and the transfer gear 6.

[0047] principle:

[0048] In the installed state, the main conduction shaft 2 is connected to the engine and other driving equipment on the harvester to obtain power and transmit it to the ear picking output shaft 3 and the straw plowing output shaft 4. The ear picking output shaft 3 extends to the front side of the harvester and is used to connect to the ear picking roller, thereby providing power to the ear picking roller; the straw plowing output shaft 4 is arranged upward and is used to connect to the straw plowing sprocket 41, thereby providing power to the straw plowing chain. When the ear picking roller and its related working parts are stuck by foreign objects, the torque required by the main conduction shaft 2 to drive the ear picking output shaft 3 increases. When the torque exceeds the elastic torque limiter 5, the elastic torque limiter 5 and the main conduction shaft 2 rotate relative to each other, thereby disconnecting the transmission. It avoids the failure of the straw plowing and ear picking gearbox caused by overload, such as tooth breaking, shaft breakage, and shell 1 rupture, and at the same time avoids damage to the working part caused by continued external power transmission, effectively protecting the straw plowing and ear picking gearbox and its power receiving part.

[0049] With the present invention, the main conduction shaft 2 and the transfer gear 6 are transmitted through the elastic torque limiter 5. When the ear picking output shaft 3 is overloaded, the elastic torque limiter 5 elastically disconnects the transmission, effectively protecting the plucking and ear picking gearbox and its power receiving part; the ear picking output shaft 3 extends from a side wall of the shell 1, and is in the same direction as the axial direction of the ear picking roller when installed, and the plucking output shaft 4 extends upward, in the same axial direction as the plucking sprocket 41. The intermediate transmission structure is simple and compact, and the plucking and ear picking gearbox is small in size.

[0050] Further, such as Figure 4-7As shown: the elastic torque limiter 5 includes a hub 51 and an elastic unit 52. The hub 51 is sleeved on the main transmission shaft 2, and the outer periphery of the hub 51 is connected to the intermediate gear 6. A torque limiting groove 53 is provided on the inner side of the hub 51. One end of the elastic unit 52 is connected to the main transmission shaft 2, and the other end is inserted into the torque limiting groove 53. When the hub 51 and the elastic unit 52 are subjected to relative force along the circumference of the hub 51, the torque limiting groove 53 generates a component force on the elastic unit 52 along the axial direction of the elastic unit 52.

[0051] Note: The intermediate gear 6 may also be used as the hub 51.

[0052] When the main transmission shaft 2 and the hub 51 are transmitting, the force of the main transmission shaft 2 is transmitted to the hub 51 through the elastic unit 52, so that the hub 51 and the elastic unit 52 are subjected to relative force along the circumference of the hub 51; when the ear picking output shaft 3 and its working part are overloaded, the resistance of the driving hub 51 is too large, and the torque limiting groove 53 increases the component force of the elastic unit 52 along the axial direction of the elastic unit 52, thereby overcoming the elastic force of the elastic unit 52, causing the elastic unit 52 to exit the torque limiting groove 53, and realizing elastic cutting-off transmission; when the overload disappears, the elastic unit 52 enters the torque limiting groove 53 under the action of its own elastic force, and can transmit to the transfer gear 6 again, and can automatically reset, saving the cost of manual reset.

[0053] Further, such as Figure 4-5 As shown, the elastic units 52 are provided in multiple groups, and the multiple groups of elastic units 52 are arranged along the axial direction of the main conduction shaft 2 , and the multiple elastic units 52 in the same group are evenly distributed along the circumference of the main conduction shaft 2 .

[0054] It is convenient to disperse the transmission torque from the main transmission shaft 2 to the hub 51, the force is evenly distributed, and the service life is long.

[0055] Further, such as Figure 4-7 As shown, a guide groove 21 is provided on the main conduction shaft 2 , and each elastic unit 52 extends into a guide groove 21 .

[0056] The distance from the outer side of the main conduction shaft 2 to the inner side of the hub 51 is reduced, and the exposed length of the elastic unit 52 is small, thereby preventing the elastic unit 52 from being deformed by bending moment and causing disintegration or failure, and improving reliability.

[0057] Furthermore, the elastic unit 52 includes a spring seat 521 and an elastic member 522, both of which are located in the guide groove 21. One end of the elastic member 522 abuts against the bottom of the guide groove 21, and the other end abuts against one end of the spring seat 521. The other end of the spring seat 521 extends out of the guide groove 21 and is inserted into the torque limiting groove 53 of the wheel hub 51.

[0058] Preferably, the elastic member 522 is a spring.

[0059] The elastic member 522 provides elastic force to the spring seat 521 , and the guide groove 21 guides the spring seat 521 . When overloaded, the spring seat 521 retracts into the guide groove 21 . When the overload disappears, the elastic force of the elastic member 522 resets the spring seat 521 , which has good reliability.

[0060] Further, such as Figure 6-7 As shown, one end of the spring seat 521 facing the elastic member 522 is cylindrical, and the other end of the elastic member 522 extends into the spring seat 521.

[0061] The spring seat 521 and the elastic member 522 partially overlap, which improves the stability of both. At the same time, the space occupied by the two is small, which reduces the depth required for the guide groove 21 and reduces the strength weakening effect of the guide groove 21 on the main conduction shaft 2.

[0062] Furthermore, the other end of the spring seat 521 is provided with a long strip-shaped protrusion 523, the length direction of the protrusion 523 is the axial direction of the hub 51, and the protrusion 523 is inserted into the torque limiting groove 53 of the hub 51; the top of the protrusion 523 is arc-shaped, and the two sides of the protrusion 523 are inclined surfaces, and the two sides of the protrusion 523 are rounded transitions to the end of the spring seat 521.

[0063] The wheel hub 51 is driven by the long strip-shaped protrusion 523, which has a large contact surface and reduces stress. The top arc shape, the inclined surfaces on both sides and the rounded corner transition of the protrusion 523 facilitate the torque limiting groove 53 to generate a component force on the protrusion 523 along the axial direction of the spring seat 521, so that the protrusion 523 can exit the torque limiting groove 53.

[0064] Furthermore, a groove 524 is provided on the top of the protrusion 523 , and notches on both sides of the groove 524 are arc-shaped.

[0065] This facilitates reducing the contact area between the raised portion 523 and the hub 51 , thereby reducing wear when the two slide relative to each other.

[0066] Furthermore, in a cross section perpendicular to the axis of the hub 51 , the torque limiting groove 53 is in an arc shape.

[0067] This facilitates generating a component force on the elastic unit 52 along the axial direction of the spring seat 521 , so that the elastic unit 52 can exit the torque limiting groove 53 .

[0068] Further, such as Figure 2 、 4 As shown: the transfer gear 6 is a double bevel gear, there are two ear picking output shafts 3 and they are located on both sides of the double bevel gear, and one end of the ear picking output shaft 3 extending into the housing 1 is provided with a first bevel gear 7, and the first bevel gear 7 is engaged with the double bevel gear.

[0069] Preferably, the first bevel gear 7 and the ear picking output shaft 3 are integrally formed.

[0070] The two first bevel gears 7 can be driven to rotate in opposite directions by the double bevel gears, thereby providing power for the two ear picking output shafts 3 to rotate in opposite directions.

[0071] Further, such as Figure 2 As shown: a bed knife connecting shaft 11 is further provided on the front side wall of the housing 1, and the bed knife connecting shaft 11 is connected to the ear picking output shaft 3 through a gear set.

[0072] Preferably, the gear set includes an output gear 10 on the ear picking output shaft 3, an input gear 12 of the bottom knife connecting shaft 11, an idler gear 13 is provided between the output gear 10 and the input gear 12, and the output gear 10 and the input gear 12 are respectively engaged with the idler gear 13.

[0073] The bed knife connecting shaft 11 is used to connect and drive the bed knife below the ear picking roller, and has a compact structure. When the bed knife is stuck and overloaded, the elastic torque limiter 5 can disconnect the transmission, thereby avoiding damage to the bed knife.

[0074] Further, such as Figure 4 As shown: there are two plowing output shafts 4, and a second bevel gear 8 is provided at the lower end of the plowing output shaft 4. Two third bevel gears 9 are provided on the main transmission shaft 2. The small ends of the two third bevel gears 9 are arranged opposite to each other, and each second bevel gear 8 corresponds to and meshes with a third bevel gear 9.

[0075] The small ends of the two third bevel gears 9 are arranged opposite to each other, and can drive the two second bevel gears 8 to rotate in opposite directions, so as to provide power for the two reel sprockets 41 to rotate towards each other.

[0076] Furthermore, a top cover 14 is provided on the top wall of the shell 1 , and both the shell 1 and the top cover 14 are made of gravity-cast aluminum material with the grade ZL101A.

[0077] While ensuring the strength of individual parts and assemblies, the total weight of parts and assemblies is reduced by one third, and the processing accuracy and cleanliness of parts are greatly improved, ensuring the connection strength and reducing the failure rate.

[0078] In the description of the present invention, it should be understood that if there are descriptive terms indicating orientation, direction or positional relationship, such as: "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of understanding the present invention and simplifying the description, and does not indicate or imply that the referred part, element or whole must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0079] In addition, if there are order description terms, such as "first", "second", etc., their use in this specification is to facilitate understanding or simplify the description. For example, in order to distinguish multiple technical features with the same type or function, but they have to be mentioned separately, this specification may use prefix or suffix order description terms to distinguish them. Therefore, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of such features. In the description of this utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0080] In the present invention, if terms describing the relative functional relationship of structures are used, such as "install", "connect", "connect", "fix", etc., they should be understood in a broad sense unless otherwise clearly specified and limited. For example, "install", "connect", "connect", etc. can be fixed connections, detachable connections, or integrated; can be mechanical connections or electrical connections; can be direct connections or indirect connections through an intermediate medium, can be internal connections between two elements or interactive relationships between two elements; "fix" can be fixed to form an integral body, or can be detachably fixed through fasteners; can be directly fixed or fixed through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above-mentioned descriptive terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the preceding and following texts, etc.

[0081] In this utility model, if descriptive terms with ancillary or connecting meaning appear, for example, a first feature being "on" or "below" a second feature, these should not be interpreted as limiting unless otherwise expressly specified or limited. For example, "on" or "below" may refer to direct contact between the first and second features, or indirect contact between the first and second features through an intermediary. Those skilled in the art will understand the specific meanings of these descriptive terms in this utility model based on the specific circumstances, context, and coherence of the preceding and following texts.

[0082] Furthermore, when a first feature is “above,” “above,” or “above” a second feature, it 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. When a first feature is “below,” “below,” or “below” a second feature, it 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.

[0083] In the description of this specification, the description with reference to the 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 present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments, examples and features of different embodiments and examples described in this specification, unless there is any contradiction, and these combinations or combinations should all fall within the scope summarized by the present invention.

[0084] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are illustrative and cannot be understood as limiting the present invention. Changes, modifications, substitutions and variations of the above embodiments made by ordinary technicians in the field within the scope of information available from public channels and in combination with the technical inspiration given by the application documents are still within the scope of protection of the present application.

Claims

1. A gearbox for plowing and picking grains, characterized by: The invention comprises a housing (1), a main transmission shaft (2), an ear-picking output shaft (3), and a straw-pulling output shaft (4); the middle portion of the main transmission shaft (2) is located in the housing (1); one end of the straw-pulling output shaft (4) extends from the top wall of the housing (1) into the housing (1) and is connected to the main transmission shaft (2); an elastic torque limiter (5) is sleeved on the main transmission shaft (2); the elastic torque limiter (5) is connected to a transfer gear (6); one end of the ear-picking output shaft (3) extends from the front side wall of the housing (1) into the housing (1) and is connected to the transfer gear (6); when the transfer gear (6) is overloaded, the elastic torque limiter (5) can elastically disconnect the transmission between the main transmission shaft (2) and the transfer gear (6).

2. The grain plowing and ear picking gearbox according to claim 1, characterized in that: The elastic torque limiter (5) comprises a hub (51) and an elastic unit (52). The hub (51) is sleeved on the main transmission shaft (2), and the outer periphery of the hub (51) is connected to the intermediate gear (6). A torque limiting groove (53) is provided on the inner side of the hub (51). One end of the elastic unit (52) is connected to the main transmission shaft (2), and the other end is inserted into the torque limiting groove (53). When the hub (51) and the elastic unit (52) are subjected to relative force along the circumference of the hub (51), the torque limiting groove (53) generates a component force on the elastic unit (52) along the axial direction of the elastic unit (52).

3. The grain plowing and ear picking gearbox according to claim 2, characterized in that: The elastic units (52) are provided in multiple groups, the multiple groups of elastic units (52) are arranged along the axial direction of the main conduction shaft (2), and the multiple elastic units (52) in the same group are evenly distributed along the circumference of the main conduction shaft (2).

4. The grain plowing and ear picking gearbox according to claim 3, characterized in that: The main conduction shaft (2) is provided with a guide groove (21), and each elastic unit (52) extends into a guide groove (21); The elastic unit (52) comprises a spring seat (521) and an elastic member (522), both of which are located in the guide groove (21); one end of the elastic member (522) abuts against the bottom of the guide groove (21), and the other end abuts against one end of the spring seat (521); the other end of the spring seat (521) extends out of the guide groove (21) and is inserted into the torque limiting groove (53) of the wheel hub (51).

5. The grain plowing and ear picking gearbox according to claim 4, characterized in that: One end of the spring seat (521) facing the elastic member (522) is cylindrical, and the other end of the elastic member (522) extends into the spring seat (521).

6. The grain plowing and ear picking gearbox according to claim 5, characterized in that: The other end of the spring seat (521) is provided with a long strip-shaped protrusion (523), the length direction of the protrusion (523) is the axial direction of the wheel hub (51), and the protrusion (523) is inserted into the torque limiting groove (53) of the wheel hub (51); the top of the protrusion (523) is arc-shaped, the two sides of the protrusion (523) are inclined surfaces, and the two sides of the protrusion (523) and the end of the spring seat (521) are rounded transitions; A groove (524) is further provided on the top of the protruding portion (523), and notches on both sides of the groove (524) are arc-shaped.

7. The grain plowing and ear picking gearbox according to claim 2, characterized in that: On a cross section perpendicular to the axis of the hub (51), the torque limiting groove (53) is in an arc shape.

8. The grain plowing and ear picking gearbox according to claim 1, characterized in that: The transfer gear (6) is a double bevel gear, the ear picking output shafts (3) are two and are located on both sides of the double bevel gear, and one end of the ear picking output shaft (3) extending into the housing (1) is provided with a first bevel gear (7), and the first bevel gear (7) is meshed with the double bevel gear.

9. The grain plowing and ear picking gearbox according to claim 1, characterized in that: A bed knife connecting shaft (11) is also provided on the front side wall of the housing (1), and the bed knife connecting shaft (11) is connected to the ear picking output shaft (3) through a gear set.

10. The grain plowing and ear picking gearbox according to claim 1, characterized in that: There are two reel-pulling output shafts (4), and the lower ends of the reel-pulling output shafts (4) are further provided with second bevel gears (8). Two third bevel gears (9) are provided on the main transmission shaft (2), and the small ends of the two third bevel gears (9) are arranged opposite to each other. Each second bevel gear (8) corresponds to and meshes with a third bevel gear (9).

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