Left-middle ear picking gear box and corn harvester

Abstract

The utility model relates to a left middle ear picking gear box and a corn harvester, the left middle ear picking gear box comprises a box body, an input shaft and two ear picking shafts, the two ear picking shafts are horizontally arranged in the box body at intervals, are mutually parallel and can respectively and horizontally rotate around the axial directions of the two ear picking shafts, and the output ends of the two ear picking shafts respectively extend out of the box body; the input shaft is horizontally mounted in the box body, is distributed perpendicular to the two spike picking shafts and can horizontally rotate around the axial direction of the input shaft; the input shaft is in transmission connection with the two spike picking shafts through a transmission assembly. The left-middle ear picking box has the advantages of being compact in structure and reasonable in design, achieving the functions of being light in weight, high in strength, low in failure rate and the like by designing a new layout and structure, greatly reducing production cost and maintenance cost, and improving competitiveness of products.

Description

Technical Field

[0001] The utility model relates to the technical field of corn harvesters, in particular to a left-middle ear picking gear box and a corn harvester. Background Art

[0002] The ear picking box refers to one of the important working parts of the corn harvester. Its main function is to provide power for the stalk conveying system of the corn harvester to realize the harvesting of the stalks and the transportation of corn into the header box for harvesting.

[0003] The mainstream left-center ear-picking box on the market currently has the disadvantages of being bulky and heavy in appearance, heavy in overall weight, low in strength, high in failure rate, and easy to cause chain entanglement. Utility Model Content

[0004] The utility model provides a left-middle ear picking gear box and a corn harvester, aiming to solve the problems in the prior art.

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

[0006] A left-center ear-picking gear box comprises a box body, an input shaft and two ear-picking shafts, wherein the two ear-picking shafts are installed in the box body at intervals and are parallel to each other and can rotate horizontally around their own axes, and their output ends extend outside the box body respectively; the input shaft is installed horizontally in the box body, is distributed perpendicular to the two ear-picking shafts, and can rotate horizontally around their own axes; the input shaft is connected to the two ear-picking shafts through a transmission assembly.

[0007] The utility model has the beneficial effects that during use, power is input from the input shaft, transmitted to two ear picking shafts through the transmission assembly, and then transmitted to the stalk rollers by the two ear picking shafts, thereby realizing corn harvesting and convenient harvesting.

[0008] The utility model has a compact structure and a reasonable design. By designing a new layout and structure, the left middle ear picking box has the functions of light weight, high strength, and low failure rate, which greatly reduces the production cost and maintenance cost and improves the competitiveness of the product.

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

[0010] Furthermore, the transmission assembly includes a driving bevel gear and two ear-picking passive gears, and the two ear-picking passive gears are coaxially fixedly sleeved on the input ends of the two ear-picking shafts; the driving bevel gear is coaxially fixedly sleeved on the output end of the input shaft through a spline, and is connected to the two ear-picking passive gears through a transmission member.

[0011] The beneficial effect of adopting the above further scheme is that during the use process, power is input from the input shaft. The input shaft uses the driving bevel gear and transmission parts to transmit the power to the two ear-picking driven gears, and the two ear-picking driven gears then transmit the power to the two ear-picking shafts, and then the power is transmitted from the two ear-picking shafts to the stalk roller to achieve the harvesting of corn, which is convenient for harvesting.

[0012] Further, the transmission part includes a driven bevel gear and an ear-picking idler gear. The driven bevel gear is rotatably installed in the box body through a driven bevel gear idler shaft and meshes with one of the ear-picking driven gears; the ear-picking idler gear is rotatably installed in the box body through an ear-picking idler shaft and meshes with the other ear-picking driven gear and the driven bevel gear.

[0013] The beneficial effect of adopting the above further scheme is that during the use process, power is input from the input shaft. The input shaft uses the driving bevel gear to transmit the power to the driven bevel gear and one of the ear-picking driven gears; at the same time, the driven bevel gear transmits the power to the ear-picking idler gear, and the power is then transmitted from the ear-picking idler gear to the other ear-picking driven gear, so as to transmit the power from the two ear-picking shafts to the stalk roller to achieve the harvesting of corn, which is convenient for harvesting.

[0014] Further, the driven bevel gear includes an integral straight bevel gear and a cylindrical gear.

[0015] The beneficial effect of adopting the above further scheme is that the straight bevel gear and the cylindrical gear adopt an integral structure, directly transmitting the bevel gear power to the ear-picking driven gear through the cylindrical gear, and providing harvesting power for the stalk roller on the corn harvester through the ear-picking shaft.

[0016] Further, both ends of the input shaft and / or both ends of the two ear-picking shafts and / or both ends of the driven bevel gear idler shaft and / or both ends of the ear-picking idler shaft are respectively rotatably connected to the box body through ball bearings.

[0017] The beneficial effect of adopting the above further scheme is that both ends of each shaft are respectively positioned by ball bearings, improving the assembly accuracy of the corresponding gears and the fixing of the axial clearance of the bearings, which is convenient for assembly and maintenance.

[0018] Further, the input end of the input shaft extends outside the box body, and a sprocket is coaxially and fixedly sleeved thereon.

[0019] The beneficial effect of adopting the above further scheme is that during the use process, power is directly transmitted from the sprocket to the input shaft to achieve the input of power.

[0020] Further, the sprocket is fixedly installed on the input shaft through a flat key, and the sprocket and / or the driven bevel gear are respectively fixed through flat washers and bolts.

[0021] The beneficial effects of adopting the above further solution are simple structure, reasonable design, convenient assembly and easy maintenance.

[0022] Further, an oil filling hole penetrating through the inside and outside is provided at the front end of the box body, and an oil filling plug is installed at the oil filling hole; an observation hole penetrating through the inside and outside is provided at the top of the box body, and an observation hole plug is installed at the observation hole; a drain hole penetrating through the inside and outside is provided at the bottom of the box body, and a drain hole cock is installed at the drain hole.

[0023] The beneficial effects of adopting the above further solution are simple structure, reasonable design, convenient addition of oil through the oil filling hole, and convenient discharge of the oil in the box body through the drain hole; in addition, it is convenient to observe the gear meshing condition during assembly and maintenance through the observation hole.

[0024] Further, the output ends of the two ear picking shafts are respectively connected to the stalk roller through connecting ball heads.

[0025] The beneficial effects of adopting the above further solution are simple structure, convenient assembly, and the ear picking shaft transmits power to the stalk roller on the corn harvester through the connecting ball head, realizing the process of harvesting corn straws and harvesting corn into the cutting table box.

[0026] The present utility model further relates to a corn harvester, including the left middle ear picking tooth box as described above.

[0027] The beneficial effects of adopting the above further solution are that the present utility model further relates to a corn harvester, which has a compact structure, reasonable design, and realizes functions such as light weight, high strength, and low failure rate of the left middle ear picking box through the design of a new layout and structure, greatly reducing the production cost and maintenance cost, and improving the competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a three-dimensional structure schematic diagram of the present utility model;

[0029] Figure 2 is one of the side views of the present utility model;

[0030] Figure 3 is another side view of the present utility model;

[0031] Figure 4 is Figure 3 the sectional view taken along B-B in

[0032] Figure 5 is one of the side views of the present utility model;

[0033] Figure 6 is Figure 5 the sectional view taken along C-C in

[0034] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0035] 1. Observation hole plug; 2. Box body; 3. Passive ear picking gear; 4. Idler ear picking gear; 5. Cover plate; 6. Sprocket; 7. Flat key; 8. Flat washer; 9. Bolt; 10. Oil seal; 11. Ball bearing; 12. Drain hole plug; 13. Bottom plate; 14. Active bevel gear; 15. Retaining ring; 16. End cover; 17. Input shaft; 18. Passive bevel gear; 19. Ear picking shaft; 20. Connecting ball head; 21. Ear picking shaft cover; 22. O-ring; 23. Ear picking idler shaft; 24. Passive bevel gear idler shaft; 25. Oil filling plug. Detailed implementation manners

[0036] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0037] 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", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the attached drawings, and 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, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. 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", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0038] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; 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. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.

[0039] The present utility model will be described in detail below with reference to the attached drawings and in combination with embodiments.

[0040] Embodiment 1

[0041] As Figures 1 to 6As shown, the present embodiment provides a left-center ear picking gear box, characterized in that it includes a box body 2, an input shaft 17 and two ear picking shafts 19, the two ear picking shafts 19 are installed in the box body 2 at intervals and are parallel to each other and can rotate horizontally around their own axes, and their output ends extend to the outside of the box body 2 respectively; the input shaft 17 is installed horizontally in the box body 2, is distributed perpendicular to the two ear picking shafts 19, and can rotate horizontally around its own axes; the input shaft 17 is connected to the two ear picking shafts 19 through a transmission assembly.

[0042] During use, power is inputted from the input shaft 17, and transmitted to the two ear picking shafts 19 through the transmission assembly, and then transmitted to the stalk rollers by the two ear picking shafts 19, so that corn harvesting is realized, and harvesting is convenient.

[0043] Preferably, in this embodiment, the box body 2 is preferably a rectangular box body, and a portion of its upper end surface is a horizontal surface structure and another portion thereof is an inclined surface structure.

[0044] In addition, the bottom of the box body 2 is open, and a bottom plate 13 is fixedly installed by bolts, which is convenient for installation and maintenance.

[0045] This embodiment has a compact structure and a reasonable design. By designing a new layout and structure, the left-center ear-picking box has the functions of light weight, high strength, and low failure rate, which greatly reduces the production cost and maintenance cost and improves the competitiveness of the product.

[0046] Example 2

[0047] On the basis of Example 1, in this embodiment, the transmission assembly includes a driving bevel gear 14 and two ear picking passive gears 3, and the two ear picking passive gears 3 are coaxially fixedly sleeved on the input ends of the two ear picking shafts 19; the driving bevel gear 14 is coaxially fixedly sleeved on the output end of the input shaft 17 through a spline, and is connected to the two ear picking passive gears 3 through a transmission member.

[0048] During use, power is input by the input shaft 17, and the input shaft 17 transmits power to the two ear picking passive gears 3 using the active bevel gear 14 and the transmission parts. The two ear picking passive gears 3 then transmit power to the two ear picking shafts 19, and then the two ear picking shafts 19 transmit power to the stalk rollers, thereby realizing corn harvesting and making harvesting convenient.

[0049] Based on the above solution, the active bevel gear 14 is connected to the input shaft 17 via a spline, supported and positioned by a ball bearing 11 , mounted on the housing 2 , and fixed and positioned by an end cover 16 .

[0050] Example 3

[0051] On the basis of Embodiment 2, in this embodiment, the transmission member includes a driven bevel gear 18 and a ear-picking idler gear 4. The driven bevel gear 18 is rotatably mounted in the housing 2 through a driven bevel gear idler shaft 24 and meshes with one of the ear-picking driven gears 3. The ear-picking idler gear 4 is rotatably mounted in the housing 2 through an ear-picking idler shaft 23 and meshes with the other ear-picking driven gear 3 and the driven bevel gear 18.

[0052] During use, power is input from the input shaft 17. The input shaft 17 uses the driving bevel gear 14 to transmit the power to the driven bevel gear 18 and one of the ear-picking driven gears 3. At the same time, the driven bevel gear 18 transmits the power to the ear-picking idler gear 4, and the power is then transmitted from the ear-picking idler gear 4 to the other ear-picking driven gear 3, so as to transmit the power from the two ear-picking shafts 19 to the stalk roller, realizing the harvesting of corn, which is convenient for harvesting.

[0053] Preferably, in this embodiment, the driven bevel gear 18 is integrally processed with a consistent positioning reference, ensuring the machining accuracy of the bevel gear and the cylindrical gear.

[0054] Preferably, in this embodiment, the driven bevel gear idler shaft 24 is positioned with the housing 2. Through a small transition fit between the outer end face and the inner hole, the connection strength and the perpendicularity of the positioning surface are ensured. The driven bevel gear 18 is connected and positioned with the driven bevel gear idler shaft 24 through two ball bearings 11, improving the connection strength and reducing the failure rate.

[0055] Embodiment 4

[0056] On the basis of Embodiment 3, in this embodiment, the driven bevel gear 18 includes a straight bevel gear and a cylindrical gear integrally formed.

[0057] The straight bevel gear and the cylindrical gear adopt an integral structure, directly transmitting the power of the bevel gear to the ear-picking driven gear 3 through the cylindrical gear, and providing harvesting power for the stalk roller on the corn harvester through the ear-picking shaft 19.

[0058] Embodiment 5

[0059] On the basis of any one of Embodiments 3 to 4, in this embodiment, both ends of the input shaft 17 and / or both ends of the two ear-picking shafts 19 and / or both ends of the driven bevel gear idler shaft 24 and / or both ends of the ear-picking idler shaft 23 are respectively rotatably connected to the housing 2 through ball bearings 11.

[0060] Both ends of each shaft are respectively positioned by ball bearings 11, improving the assembly accuracy of the corresponding gears and the fixing of the axial clearance of the bearings, and facilitating assembly and maintenance.

[0061] Preferably, in this embodiment, two mounting holes are oppositely provided on the box body 2, and the input end of the input shaft 17 passes through one of the mounting holes and extends outside the box body 2.

[0062] In addition, a cover plate 5 is fixedly installed at one of the mounting holes, and a groove is provided on the cover plate 5, and a oil seal 10 is installed between the groove and the input shaft 17; an end cover 16 is fixedly installed at the other mounting hole.

[0063] Preferably, in this embodiment, two pairs of internally and externally penetrating fixing holes are oppositely provided on the box body 2, the input ends of the two ear picking shafts 19 respectively extend to two of the fixing holes, and their output ends respectively pass through the remaining two fixing holes and extend outside the box body 2.

[0064] In addition, ear picking shaft covers 21 are respectively fixedly installed at the two fixing holes corresponding to the output ends of the two ear picking shafts 19, and the output ends of the two ear picking shafts 19 respectively penetrate through the two ear picking shaft covers 21; end covers 16 are respectively fixedly installed at the two fixing holes corresponding to the input ends of the two ear picking shafts 19.

[0065] Moreover, oil seals 10 are installed between the two ear picking shaft covers 21 and the corresponding two ball bearings 11.

[0066] Preferably, in this embodiment, one end of the above-mentioned ear picking idler shaft 23 is fixedly connected to the box body 2, and the ear picking idler 4 is rotatably connected to the ear picking idler shaft 23 through a bearing; a retaining ring 15 is fixedly sleeved on one end of the ear picking idler shaft 23 close to the ear picking idler 4, and an end cover 16 is fixedly installed on the box body 2 at the position corresponding to the other end of the ear picking idler shaft 23.

[0067] In addition, the above-mentioned oil seal 10 is installed on the cover plate 5, and the clearance between the cover plate 5 and the input shaft 17 is <0.5 mm, preventing dust from entering the end face of the oil seal, causing oil seal pollution and damage, and further causing oil leakage in the gear box.

[0068] Moreover, the clearances between the cover plate 5 and the ear picking shaft cover 21 and the shaft are both small, which can effectively prevent dust from entering the dust-proof lip of the oil seal, forming a sealed housing space, preventing internal lubricating oil from leaking and external impurities from entering. At the same time, the oil seals 10 on the ear picking shaft 19 are two oil seals, improving the sealing performance at the ear picking shaft 19.

[0069] Preferably, in this embodiment, one end of the above-mentioned passive bevel gear idler shaft 24 is fixedly connected to the box body 2, and the passive bevel gear 18 is rotatably sleeved on the other end of the passive bevel gear idler shaft 24 through a bearing.

[0070] In addition, the box body 2 is provided with hole bodies that cooperate with the other end of the passive bevel gear idler shaft 24 and the other end of the ear picking idler shaft 23; and O-rings 22 are respectively installed between the other end of the passive bevel gear idler shaft 24 and the box body 2 and between the other end of the ear picking idler shaft 23 and the box body 2.

[0071] Based on the above solution, the ball bearing 11, the ear-picking idler 4 and the ear-picking idler shaft 23 are positioned by a retaining ring 15 to ensure the axial end-play distance of the ear-picking idler shaft. An O-ring 22 is provided on the ear-picking idler shaft 23, and there is a small interference fit between the ear-picking idler shaft 23 and the box body 2, ensuring the positional accuracy and perpendicularity of the ear-picking idler shaft 23.

[0072] Embodiment 6

[0073] Based on any one of Embodiments 3 to 5, in this embodiment, the input end of the input shaft 17 extends outside the box body 2, and a sprocket 6 is coaxially and fixedly sleeved thereon.

[0074] During use, power is directly transmitted from the sprocket 6 to the input shaft 17 to achieve power input.

[0075] Embodiment 7

[0076] Based on Embodiment 6, in this embodiment, the sprocket 6 is fixedly installed on the input shaft 17 through a flat key 7, and the sprocket 6 and / or the driven bevel gear 18 are respectively fixed through a flat washer 8 and a bolt 9.

[0077] This solution has a simple structure, reasonable design, convenient assembly and easy maintenance.

[0078] Based on the above solution, the sprocket 6 is connected to the input shaft 17 through a flat key 7, and there is a taper in the inner hole of the connection between the sprocket 6 and the input shaft 17, increasing the frictional torque, improving the connection strength and reducing the failure rate.

[0079] Based on the above solution, the above-mentioned sprocket 6 is coaxially sleeved on the input end of the input shaft 17 through a flat key 7. The bolt 9 passes through the flat washer 8, and the bolt 9 is threadedly connected to the corresponding end of the input shaft 17, and the flat washer 8 abuts against the corresponding end of the sprocket 6.

[0080] Embodiment 8

[0081] Based on the above embodiments, in this embodiment, the front end of the box body 2 is provided with an oil filling hole penetrating inside and outside, and an oil filling plug 25 is installed at the oil filling hole; the top of the box body 2 is provided with an observation hole penetrating inside and outside, and an observation hole plug 1 is installed at the observation hole; the bottom of the box body 2 is provided with an oil drain hole penetrating inside and outside, and an oil drain hole plug 12 is installed at the oil drain hole.

[0082] This solution has a simple structure and reasonable design. It is convenient to add oil through the oil filling hole, and at the same time, it is convenient to drain the oil in the box body 2 through the oil drain hole; in addition, it is convenient to observe the gear meshing condition during assembly and maintenance through the observation hole.

[0083] Based on the above solution, the fuel filling plug 25 is threadedly connected to the fuel filling hole, the inspection hole plug 1 is threadedly connected to the inspection hole, and the drain hole plug 12 is threadedly connected to the drain hole.

[0084] Embodiment 9

[0085] Based on the above embodiments, in this embodiment, the output ends of the two ear picking shafts 19 are respectively connected to the stalk rollers through connecting ball heads 20.

[0086] This solution has a simple structure and is convenient for assembly. The ear picking shaft 19 transmits power to the stalk roller on the corn harvester through the connecting ball head 20, realizing the process of harvesting corn straw and harvesting corn into the cutting table box.

[0087] Embodiment 10

[0088] Based on the above embodiments, this embodiment provides a corn harvester, including the left middle ear picking tooth box as described above.

[0089] This embodiment also relates to a corn harvester. The structure of this corn harvester is compact and reasonably designed. By designing a new layout and structure, functions such as light weight, high strength, and low failure rate of the left middle ear picking box are achieved, greatly reducing the production cost and maintenance cost, and improving the competitiveness of the product.

[0090] The working principle of the present utility model is as follows:

[0091] During use, power is input from the input shaft 17. The input shaft 17 uses the driving bevel gear 14 to transmit power to the driven bevel gear 18 and one of the ear picking driven gears 3; at the same time, the driven bevel gear 18 transmits power to the ear picking idler gear 4, and the power is then transmitted from the ear picking idler gear 4 to the other ear picking driven gear 3, thereby transmitting the power from the two ear picking shafts 19 to the stalk roller to realize the harvesting of corn, which is convenient for harvesting.

[0092] Att Figure 4 The arrows in it only refer to the path of power transmission and have no other substantial meaning.

[0093] The present utility model provides a left middle ear picking tooth box. By designing a new layout and structure, the left middle ear picking box has the advantages of light weight, high strength, and low failure rate, greatly reducing the production cost and maintenance cost, and improving the competitiveness of the product.

[0094] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claimed claim.

[0095] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0096] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A left middle ear picking gear box, characterized in that: It comprises a housing (2), an input shaft (17) and two ear picking shafts (19); the two ear picking shafts (19) are installed horizontally and spaced apart in the housing (2); they are parallel to each other and can rotate horizontally around their own axes, and their output ends extend outside the housing (2); the input shaft (17) is installed horizontally in the housing (2); it is perpendicular to the two ear picking shafts (19) and can rotate horizontally around its own axes; the input shaft (17) is connected to the two ear picking shafts (19) through a transmission assembly; The transmission assembly comprises a driving bevel gear (14) and two ear picking passive gears (3), wherein the two ear picking passive gears (3) are respectively coaxially fixedly sleeved on the input ends of the two ear picking shafts (19); the driving bevel gear (14) is coaxially fixedly sleeved on the output end of the input shaft (17) through a spline, and is transmission-connected to the two ear picking passive gears (3) through a transmission member; The transmission member comprises a passive bevel gear (18) and an ear picking idler wheel (4); the passive bevel gear (18) is rotatably mounted in the housing (2) via a passive bevel gear idler wheel shaft (24), and is meshed with one of the ear picking passive gears (3); the ear picking idler wheel (4) is rotatably mounted in the housing (2) via an ear picking idler wheel shaft (23), and is meshed with another of the ear picking passive gears (3) and the passive bevel gear (18).

2. The left middle ear picking gear box according to claim 1, characterized in that: The passive bevel gear (18) comprises an integrally formed straight bevel gear and a cylindrical gear.

3. The left middle ear picking gear box according to claim 1, characterized in that: Both ends of the input shaft (17) and / or both ends of the two ear picking shafts (19) and / or both ends of the passive bevel gear idler shaft (24) and / or both ends of the ear picking idler shaft (23) are rotatably connected to the housing (2) via ball bearings (11).

4. The left middle ear picking gear box according to claim 1, characterized in that: The input end of the input shaft (17) extends to the outside of the box body (2), and a sprocket (6) is coaxially fixedly sleeved thereon.

5. The left middle ear picking gear box according to claim 4, characterized in that: The sprocket (6) is fixedly mounted on the input shaft (17) via a flat key (7), and the sprocket (6) and / or the passive bevel gear (18) are fixed via a flat washer (8) and a bolt (9) respectively.

6. The left middle ear picking gear box according to any one of claims 1 to 5, characterized in that: The front end of the box body (2) is provided with a refueling hole that penetrates inside and outside, and a refueling screw plug (25) is installed at the refueling hole; the top of the box body (2) is provided with an observation hole that penetrates inside and outside, and an observation hole screw plug (1) is installed at the observation hole; the bottom of the box body (2) is provided with an oil drain hole that penetrates inside and outside, and an oil drain hole cock (12) is installed at the oil drain hole.

7. The left middle ear picking gear box according to any one of claims 1 to 5, characterized in that: The output ends of the two ear picking shafts (19) are respectively connected to the stalk rollers through connecting ball heads (20).

8. A corn harvester, characterized in that: It comprises the left middle ear picking gear box as described in any one of claims 1-7.

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