Crawler-type agricultural machinery gearbox

Abstract

The utility model provides a crawler-type agricultural machinery gearbox which comprises a main shell, a speed change mechanism is arranged in the main shell, and a windowing cover plate and a front cover plate are arranged at the position, right opposite to the speed change mechanism, of the upper side of the main shell. A side cover and a half shaft assembly are arranged on the left side and the right side of the main shell, the half shaft assembly is connected with the side cover, one end of the half shaft assembly extends into the shell and is connected with a half shaft gear, and the half shaft gear is in transmission connection with the speed change mechanism. A first bearing and a second bearing are sleeved at two ends of a hub of the half axle gear, an outer ring of the first bearing is connected with the main shell, and an outer ring of the second bearing is connected with the side cover. According to the utility model, one end of the hub is connected with the main shell through the first bearing, and the other end of the hub is connected with the side cover through the second bearing, so that the two ends of the half axle gear are restrained, the deflection of the half axle gear is prevented from being driven by the deflection of the half axle, the tooth surface pitting corrosion caused by unbalance loading is avoided, and the service life is prolonged; and maintenance is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of gearboxes, in particular to a crawler-type agricultural machinery gearbox. Background Art

[0002] The gearbox is one of the core components of the transmission system of harvesting machinery. The gearbox has tooth clutches, brakes and half-shaft assemblies on both sides, and the half-shaft assemblies are equipped with drive wheels. The tooth clutch can transmit the input power to the half-shaft assemblies on both sides, and control the power on and off of the corresponding half-shaft assembly at the same time. The brake can achieve unilateral braking of the corresponding half-shaft assembly when the tooth clutch is disconnected, thereby achieving the functions of straight-line travel, steering travel and multi-speed shifting.

[0003] At present, crawler-type agricultural machinery gearboxes mostly use split main housings, and the half-shaft gears in the half-shaft assembly are sleeved at one end of the half-shaft extending into the main housing, forming a cantilever beam-like form. Due to the low installation rigidity of the half-shaft gears, they are easily affected by the deflection of the half-shaft and cause partial load, resulting in pitting on the tooth surface and a short service life.

[0004] In addition, when inspecting the split main housing, the gearbox must be removed from the vehicle as a whole and the main housing must be separated into the left and right halves before the internal parts can be inspected, which increases the difficulty of inspection. The inspection frequency of the half-axle assembly is higher, and when inspecting the half-axle assembly, the above-mentioned process of removing the gearbox from the vehicle as a whole and disassembling it is also necessary. Utility Model Content

[0005] The technical problem to be solved by the utility model is: how to prevent the half-shaft gear from being overloaded due to the influence of the half-shaft deflection on the gearbox of the crawler-type agricultural machinery, and at the same time facilitate maintenance.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] The utility model provides a crawler-type agricultural machinery gearbox, comprising a main housing, wherein a speed change mechanism is arranged in the main housing, and a window cover plate and a front cover plate are arranged on the upper side of the main housing opposite to the speed change mechanism; side covers and half-shaft assemblies are arranged on the left and right sides of the main housing, the half-shaft assembly is connected to the side covers, and one end of the half-shaft assembly extends into the housing and is connected to a half-shaft gear, and the half-shaft gear is transmission-connected to the speed change mechanism; a first bearing and a second bearing are sleeved on both ends of a wheel hub of the half-shaft gear, the outer ring of the first bearing is connected to the main housing, and the outer ring of the second bearing is connected to the side cover.

[0008] The beneficial effects of the utility model are:

[0009] By adopting the utility model, the two ends of the wheel hub of the half-shaft gear are set as structures that can be sleeved with bearings, and one end of the wheel hub is connected to the main shell through the first bearing, and the other end is connected to the side cover through the second bearing, so that the two ends of the half-shaft gear are constrained, and the half-shaft deflection driving the half-shaft gear to swing is avoided, thereby avoiding tooth surface pitting caused by eccentric load and improving the service life; when repairing, the window cover and the front cover can be removed to repair the speed change mechanism, and the half-shaft assembly and the half-shaft gear can be removed with the side cover for repair, without the need to remove and disassemble the entire gearbox, which is easy to repair.

[0010] On the basis of the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, the half-shaft assembly includes a half-shaft bridge cylinder, in which a half-shaft body is arranged, and both ends of the half-shaft bridge cylinder are connected to the half-shaft body through a third bearing; one end of the half-shaft bridge cylinder is connected to the side cover, one end of the half-shaft body extends into the shell and is connected to the half-shaft gear through a spline structure, and the other end of the half-shaft body is provided with a driving wheel.

[0012] The half-shaft bridge tube is connected to the side cover to provide support for the half-shaft body, so that the half-shaft body can be extended to a suitable distance to install the drive wheel; at the same time, the half-shaft body and the half-shaft gear are connected only by a spline structure. During maintenance, only the half-shaft assembly can be removed from the side cover, or the half-shaft gear can be removed together with the side cover. The parts to be disassembled can be flexibly selected according to needs, which has good flexibility.

[0013] Furthermore, a first flange is provided at one end of the half-axle bridge tube, and the first flange is connected to the side cover by bolts; the first flange and the side cover are both connected to the outer ring of one of the third bearings.

[0014] The first flange can provide the rigidity required by the half-shaft assembly, has good sealing performance and is easy to install; the first flange and the side cover jointly support the third bearing, and have good stability.

[0015] Furthermore, a second flange and a third flange are provided at the other end of the half-shaft bridge tube, the second flange is fixed on the half-shaft bridge tube, and the third flange is connected to the second flange by bolts; the second flange and the third flange are both connected to the outer ring of another third bearing; an oil seal and a shaft sleeve are provided in the third flange, the oil seal is sleeved on the shaft sleeve, and the shaft sleeve is sleeved on the half-shaft body.

[0016] The outer ring of the third bearing is supported by the second flange and the third flange, which has good stability and is easy to disassemble and assemble. The space of the third flange is used to install the oil seal and the sleeve, which is convenient for sealing the lubricating oil of the third bearing. At the same time, the sleeve can axially limit the driving wheel and share the axial force of the driving wheel and the half-shaft body toward the main housing, thereby improving safety.

[0017] Furthermore, a shaft shoulder is provided on the half-shaft body, and the other third bearing is located between the shaft shoulder and the shaft sleeve.

[0018] It is convenient to limit the half-shaft body, can share the axial force of the half-shaft body away from the main housing, and improves safety.

[0019] Furthermore, a retaining ring is provided on the half-shaft body, and the retaining ring is located on a side of the driving wheel away from the third flange.

[0020] It is convenient to restrict the axial movement of the half-axle body relative to the driving wheel, and has good stability.

[0021] Furthermore, the speed change mechanism includes an input gear shaft, a first shaft, a second shaft, a tooth shaft and an output gear shaft. The input gear shaft is connected to the first shaft through a gear transmission, the first shaft and the second shaft are connected through a speed change gear set, and the second shaft is connected to the tooth shaft through a gear transmission; a tooth clutch is provided on the tooth shaft, and sliding gears are provided on both sides of the tooth clutch. The sliding gears are loosely sleeved on the tooth shaft, and the side surfaces of the sliding gears can engage with the tooth clutch, and each sliding gear corresponds to and engages with an output gear shaft; brakes are also provided on both sides of the main housing, and each sliding gear corresponds to and is connected to a brake; each output gear shaft corresponds to and engages with a half-shaft gear.

[0022] The power is split through two output gear shafts, and the power transmission to the two output gear shafts is controlled by the tooth clutch. When the power of one of the output gear shafts is disconnected, the brake performs unilateral braking on the corresponding sliding gear, thereby achieving straight-line travel and turning, which is easy to operate.

[0023] Furthermore, the speed gear set includes a first gear driving gear, a third gear driving gear and a second gear driving gear which are loosely mounted on one shaft, and also includes a first gear passive gear, a third gear passive gear and a second gear passive gear which are fixed on two shafts, the first gear driving gear is meshed with the first gear passive gear, the second gear driving gear is meshed with the second gear passive gear, and the third gear driving gear is meshed with the third gear passive gear; a third gear meshing gear sleeve is provided between the first gear driving gear and the third gear driving gear, and the third gear meshing gear sleeve can slide along its own axial direction to mesh with the first gear driving gear or the third gear driving gear; a second gear meshing gear sleeve is provided on one side of the second gear driving gear, and the second gear meshing gear sleeve can slide along its own axial direction to mesh with the second gear driving gear.

[0024] It realizes three-speed transmission and is easy to operate.

[0025] Furthermore, it also includes a hydraulic continuously variable transmission and an adapter assembly, both of which are connected to the main housing; the input end of the hydraulic continuously variable transmission is connected to the adapter assembly, and the output end of the hydraulic continuously variable transmission is connected to the input gear shaft through a spline structure.

[0026] The adapter assembly makes it easy to connect external power equipment and the power input is convenient; the hydraulic continuously variable transmission makes it easy to perform preliminary speed change on the external input power, so that the speed transmitted to the input gear shaft is stable within a specific range, the working stability is good, and it is easy to adapt to different power equipment.

[0027] Furthermore, the adapter seat assembly includes a flange plate, an adapter shaft is provided in the flange plate, an input wheel is provided at one end of the adapter shaft, the other end of the adapter shaft extends into the main housing and is provided with a spline sleeve, the input end of the hydraulic continuously variable transmission extends into the spline sleeve and engages; the adapter shaft is connected to the main housing through a fourth bearing, and the adapter shaft is connected to the flange plate through a fifth bearing; the flange plate and the main housing are provided with stop structures corresponding to each other.

[0028] The input wheel can be connected to the power equipment by belt drive, which makes power input convenient; the stop structure improves the coaxiality between the spline sleeve and the input end of the hydraulic continuously variable transmission, reducing wear; the flange and the main housing jointly support the transfer shaft through the fourth bearing and the fifth bearing, which has good stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the external structure of the utility model.

[0030] Figure 2 It is a schematic diagram of the internal structure of the utility model.

[0031] Figure 3 It is a structural schematic diagram of the half-shaft assembly.

[0032] Figure 4 It is a structural schematic diagram of the adapter assembly.

[0033] Figure 5 for Figure 2 The enlarged schematic diagram of the half-shaft assembly is omitted.

[0034] In the accompanying drawings, the technical features represented by the reference numerals are as follows:

[0035] 1-main housing; 2-window cover; 3-front cover; 4-side cover, 5-semi-axle assembly; 6-semi-axle gear; 7-first bearing; 8-second bearing; 9-semi-axle bridge tube; 10-semi-axle body; 11-third bearing; 12-driving wheel; 13-second flange; 14-third flange; 15-oil seal; 16-sleeve; 17-shaft shoulder; 18-retaining ring; 19-input gear shaft; 20-first shaft; 21-second shaft; 22-toothed shaft; 23-brake; 24-output gear shaft; 25-first gear active Gear; 26-first and third gear meshing gear sleeve; 27-third gear driving gear; 28-second gear driving gear; 29-second gear meshing gear sleeve; 30-first gear passive gear; 31-third gear passive gear; 32-second gear passive gear; 33-hydraulic continuously variable transmission; 34-adapter assembly; 35-flange; 36-adapter shaft; 37-input wheel; 38-spline sleeve; 39-fourth bearing; 40-fifth bearing; 41-stop structure; 42-first flange; 43-sliding gear; 44-tooth clutch. DETAILED DESCRIPTION

[0036] 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.

[0037] This utility model refers to Figure 1-5 .

[0038] The utility model provides a crawler-type agricultural machinery gearbox, comprising a main housing 1, wherein a speed change mechanism is arranged in the main housing 1, and a window cover plate 2 and a front cover plate 3 are arranged on the upper side of the main housing 1 facing the speed change mechanism; side covers 4 and half-shaft assemblies 5 are arranged on the left and right sides of the main housing 1, the half-shaft assembly 5 is connected to the side covers 4, and one end of the half-shaft assembly 5 extends into the housing and is connected to a half-shaft gear 6, and the half-shaft gear 6 is transmission-connected to the speed change mechanism; a first bearing 7 and a second bearing 8 are sleeved on both ends of the wheel hub of the half-shaft gear 6, the outer ring of the first bearing 7 is connected to the main housing 1, and the outer ring of the second bearing 8 is connected to the side covers 4.

[0039] principle:

[0040] The speed change mechanism of the gearbox is generally a multi-stage gear change, and the existing technology can be used. The half-shaft assembly 5 is a common name in the existing technology, which is generally common on crawler tractors. The end of the half-shaft assembly 5 extending out of the main housing 1 is provided with a drive wheel 12, and the drive wheel 12 is used to connect the crawler; the connection between the half-shaft assembly 5 and the side cover 4 is equivalent to the connection between the half-shaft assembly 5 and the main housing 1 in the existing technology, and its function is to support the fixed part of the half-shaft assembly 5. When working, the speed change mechanism transmits power to the half-shaft gear 6, and the half-shaft gear 6 transmits power to the half-shaft assembly 5. The power transmitted to the two half-shaft assemblies 5 is controlled by the speed change mechanism, thereby realizing the functions of straight line, turning travel and multi-speed change.

[0041] By adopting the utility model, the two ends of the hub of the half-shaft gear 6 are set as a structure that can be sleeved with bearings, and one end of the hub is connected to the main shell 1 through the first bearing 7, and the other end is connected to the side cover 4 through the second bearing 8, so that the two ends of the half-shaft gear 6 are constrained, and the half-shaft deflection driving the half-shaft gear 6 to swing, thereby avoiding pitting of the tooth surface caused by eccentric load, and improving the service life; when repairing, the window cover 2 and the front cover 3 can be removed to repair the speed change mechanism, and the half-shaft assembly 5 and the half-shaft gear 6 can be removed for repair along with the side cover 4, without the need to remove and disassemble the entire gearbox, which is easy to repair.

[0042] Further, such as Figure 3 As shown: the half-shaft assembly 5 includes a half-shaft bridge cylinder 9, in which a half-shaft body 10 is arranged, and both ends of the half-shaft bridge cylinder 9 are connected to the half-shaft body 10 through a third bearing 11; one end of the half-shaft bridge cylinder 9 is connected to the side cover 4, one end of the half-shaft body 10 extends into the shell and is connected to the half-shaft gear 6 through a spline structure, and the other end of the half-shaft body 10 is provided with a driving wheel 12.

[0043] The half-shaft bridge cylinder 9 is connected to the side cover 4 to provide support for the half-shaft body 10, so that the half-shaft body 10 can be extended to a suitable distance to install the drive wheel 12; at the same time, the half-shaft body 10 and the half-shaft gear 6 are only connected through a spline structure. During maintenance, only the half-shaft assembly 5 can be removed from the side cover 4, or the half-shaft gear 6 can be removed together with the side cover 4. The parts to be disassembled can be flexibly selected according to needs, with good flexibility.

[0044] Furthermore, a first flange 42 is provided at one end of the half-axle bridge tube 9 , and the first flange 42 is connected to the side cover 4 by bolts; the first flange 42 and the side cover 4 are both connected to the outer ring of one of the third bearings 11 .

[0045] The first flange 42 can provide the rigidity required by the half-shaft assembly 5, has good sealing performance, and is easy to install; the first flange 42 and the side cover 4 jointly support the third bearing 11, and have good stability.

[0046] Furthermore, a second flange 13 and a third flange 14 are provided at the other end of the half-shaft bridge tube 9, the second flange 13 is fixed on the half-shaft bridge tube 9, and the third flange 14 is connected to the second flange 13 by bolts; the second flange 13 and the third flange 14 are both connected to the outer ring of another third bearing 11; an oil seal 15 and a shaft sleeve 16 are provided in the third flange 14, the oil seal 15 is sleeved on the shaft sleeve 16, and the shaft sleeve 16 is sleeved on the half-shaft body 10.

[0047] The outer ring of the third bearing 11 is supported by the second flange 13 and the third flange 14, which has good stability and is easy to disassemble and assemble. The space of the third flange 14 is used to install the oil seal 15 and the shaft sleeve 16, which is convenient for sealing the lubricating oil of the third bearing 11. At the same time, the shaft sleeve 16 can axially limit the driving wheel 12, and can share the axial force of the driving wheel 12 and the half-shaft body 10 toward the main housing 1, thereby improving safety.

[0048] Furthermore, a shaft shoulder 17 is provided on the half-shaft body 10 , and the other third bearing 11 is located between the shaft shoulder 17 and the shaft sleeve 16 .

[0049] It is convenient to limit the half-shaft body 10, and can share the axial force of the half-shaft body 10 away from the main housing 1, thereby improving safety.

[0050] Furthermore, a retaining ring 18 is provided on the half-shaft body 10 , and the retaining ring 18 is located on a side of the driving wheel 12 away from the third flange 14 .

[0051] It is convenient to restrict the axial movement of the half-shaft body 10 relative to the driving wheel 12, and has good stability.

[0052] Further, such as Figure 2 , 5 As shown: the speed change mechanism includes an input gear shaft 19, a first shaft 20, a second shaft 21, a tooth shaft 22 and an output gear shaft 24, the input gear shaft 19 is connected to the first shaft 20 through gear transmission, the first shaft 20 is connected to the second shaft 21 through a speed change gear set, and the second shaft 21 is connected to the tooth shaft 22 through gear transmission; a tooth clutch 44 is provided on the tooth shaft 22, and sliding gears 43 are provided on both sides of the tooth clutch 44, the sliding gear 43 is loosely sleeved on the tooth shaft 22, and the side surfaces of the sliding gear 43 can mesh with the tooth clutch 44, and each sliding gear 43 corresponds to and meshes with an output gear shaft 24; brakes 23 are also provided on both sides of the main housing 1, and each sliding gear 43 corresponds to and is connected to a brake 23; each output gear shaft 24 corresponds to and meshes with a half-shaft gear 6.

[0053] Note: The gear transmission connection means that the gear structures on the two shafts are in a constant meshing state with each other. Each shaft is connected to the main housing 1 through a bearing, which is irrelevant to the technical problem solved by the utility model and is therefore not described in detail. The connection between the sliding gear 43 and the brake 23 is that the braking end of the sliding gear 43 extends into the brake 23 and meshes with the friction plate group therein. When the sliding gear 43 slides axially to disengage the tooth clutch 44, the sliding gear 43 simultaneously presses the friction plate group in the brake 23, thereby achieving unilateral braking.

[0054] The power is split through the two output gear shafts 24, and the power transmission to the two output gear shafts 24 is controlled by the tooth clutch 44. When the power of one of the output gear shafts 24 is disconnected, the brake 23 performs unilateral braking on the corresponding sliding gear 43, so that straight-line travel and turning can be achieved, and the operation is convenient.

[0055] Further, the speed gear set includes a first gear driving gear 25, a third gear driving gear 27 and a second gear driving gear 28 which are loosely mounted on a shaft 20, and also includes a first gear passive gear 30, a third gear passive gear 31 and a second gear passive gear 32 which are fixed on the second shaft 21, the first gear driving gear 25 meshes with the first gear passive gear 30, the second gear driving gear 28 meshes with the second gear passive gear 32, and the third gear driving gear 27 meshes with the third gear passive gear 31; a third gear meshing gear sleeve 26 is provided between the first gear driving gear 25 and the third gear driving gear 27, and the third gear meshing gear sleeve 26 can slide along its own axial direction to mesh with the first gear driving gear 25 or the third gear driving gear 27; a second gear meshing gear sleeve 29 is provided on one side of the second gear driving gear 28, and the second gear meshing gear sleeve 29 can slide along its own axial direction to mesh with the second gear driving gear 28.

[0056] Note: The meshing gear sleeve is an existing technology. The meshing gear sleeve is meshed with the shaft on which it is located through a spline. When the meshing gear sleeve slides along its own axial direction, it can mesh with the outer ring of the hub part of the gear on either side, so that it can slide along its own axial direction to mesh with the driving gear of each gear.

[0057] First gear: the first and third gear meshing gear sleeve 26 is meshed with the first gear driving gear 25, and the second gear meshing gear sleeve 29 is disengaged from the second gear driving gear 28. The power transmission sequence is: input gear shaft 19, first shaft 20, first and third gear meshing gear sleeve 26, first gear driving gear 25, first gear driven gear 30, second shaft 21, toothed shaft 22, clutch 23, output gear shaft 24.

[0058] Second gear: the first and third gear meshing gear sleeve 26 is disengaged from the first gear driving gear 25, and the second gear meshing gear sleeve 29 is meshed with the second gear driving gear 28. The power transmission sequence is: input gear shaft 19, first shaft 20, second gear meshing gear sleeve 29, second gear driving gear 28, second gear driven gear 32, second shaft 21, toothed shaft 22, clutch 23, output gear shaft 24.

[0059] Third gear: the first and third gear meshing gear sleeve 26 is meshed with the third gear driving gear 27, and the second gear meshing gear sleeve 29 is disengaged from the second gear driving gear 28. The power transmission sequence is: input gear shaft 19, first shaft 20, first and third gear meshing gear sleeve 26, third gear driving gear 27, third gear driven gear 31, second shaft 21, toothed shaft 22, clutch 23, output gear shaft 24.

[0060] It realizes three-speed transmission and is easy to operate.

[0061] Further, such as Figure 1 , 2 , 5: It also includes a hydraulic continuously variable transmission 33 and an adapter assembly 34, both of which are connected to the main housing 1; the input end of the hydraulic continuously variable transmission 33 is connected to the adapter assembly 34, and the output end of the hydraulic continuously variable transmission 33 is connected to the input gear shaft 19 through a spline structure.

[0062] Note: One end of the input gear shaft 19 is provided with an inner hole, and the output end of the hydraulic continuously variable transmission 33 is inserted into the inner hole and connected through a spline structure. The adapter assembly 34 can be connected to an external power device such as an engine through a belt drive connection or the like. The hydraulic continuously variable transmission 33 is a prior art product.

[0063] The adapter assembly 34 facilitates connection to external power equipment and convenient power input; the hydraulic continuously variable transmission 33 facilitates preliminary speed change of external input power, so that the rotation speed transmitted to the input gear shaft 19 is stabilized within a specific range, with good working stability, and is easy to adapt to different power equipment.

[0064] Further, such as Figure 1 , 2 As shown in , 4 and 5: the adapter seat assembly 34 includes a flange 35, in which an adapter shaft 36 is provided, one end of the adapter shaft 36 is provided with an input wheel 37, the other end of the adapter shaft 36 extends into the main housing 1 and is provided with a spline sleeve 38, the input end of the hydraulic continuously variable transmission 33 extends into the spline sleeve 38 and engages; the adapter shaft 36 is connected to the main housing 1 through a fourth bearing 39, and the adapter shaft 36 is connected to the flange 35 through a fifth bearing 40; the flange 35 and the main housing 1 are provided with a stop structure 41 corresponding to each other.

[0065] Note: The stop structures 41 correspond to each other, for example, a concave stop is provided on the main housing 1, and a convex stop is provided on the flange 35, and the convex stop is inserted into the concave stop, which can realize the positioning of the flange 35 and the main housing 1, improve the installation accuracy of the flange 35, and make the spline sleeve 38 and the hydraulic continuously variable transmission 33 accurately radially positioned, improve the coaxiality, and reduce the wear of the spline structure.

[0066] The input wheel 37 can be connected to the power equipment by belt drive, which makes power input convenient; the stop structure 41 improves the coaxiality between the spline sleeve 38 and the input end of the hydraulic continuously variable transmission 33, reducing wear; the fourth bearing 39 and the fifth bearing 40 make the flange 35 and the main housing 1 jointly support the adapter shaft 36, which has good stability.

[0067] 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.

[0068] In addition, if there are order description terms, such as "first", "second", etc., their purpose in this specification is to facilitate understanding or simplify description. For example, in order to distinguish multiple technical features of 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" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0069] In the present utility model, if the terms describing the relative functional relationship of the 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 a fixed connection, a detachable connection, or an integrated one; can be a mechanical connection or an electrical connection; can be a direct connection or an indirect connection through an intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements; "fix" can be an integrated fixation or a detachable fixation through fasteners; can be a direct fixation or a fixation through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above-mentioned descriptive terms in the present utility model can be understood according to the specific circumstances, the context, the coherence of the context, etc.

[0070] In the present invention, if there are descriptive terms with subsidiary or connecting meanings, for example, the first feature is "on" or "below" the second feature, unless otherwise clearly specified and limited, it should not be interpreted in a restrictive manner. For example, "on" or "below" can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above descriptive terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the context, etc.

[0071] Furthermore, the first feature being “above”, “above”, and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being “below”, “below”, and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic 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 the different embodiments and examples described in this specification without contradiction, and these combinations or combinations shall all fall within the scope summarized by the utility model.

[0073] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. A person skilled in the art can change, modify, replace and modify the above embodiments within the scope of information available from public channels and in combination with the technical inspiration provided by the present application documents.

Claims

1. A crawler agricultural machinery gearbox, characterized in that: The invention comprises a main housing (1), wherein a speed change mechanism is arranged in the main housing (1), and a window cover plate (2) and a front cover plate (3) are arranged on the upper side of the main housing (1) at a position directly opposite to the speed change mechanism; side covers (4) and a half-shaft assembly (5) are arranged on the left and right sides of the main housing (1), the half-shaft assembly (5) is connected to the side covers (4), and one end of the half-shaft assembly (5) extends into the housing and is connected to a half-shaft gear (6), and the half-shaft gear (6) is transmission-connected to the speed change mechanism; a first bearing (7) and a second bearing (8) are sleeved on both ends of the wheel hub of the half-shaft gear (6), the outer ring of the first bearing (7) is connected to the main housing (1), and the outer ring of the second bearing (8) is connected to the side covers (4).

2. The crawler-type agricultural machinery gearbox according to claim 1, characterized in that: The half-axle assembly (5) includes a half-axle bridge cylinder (9), a half-axle body (10) is arranged inside the half-axle bridge cylinder (9), and both ends of the half-axle bridge cylinder (9) are connected to the half-axle body (10) through a third bearing (11); one end of the half-axle bridge cylinder (9) is connected to the side cover (4), one end of the half-axle body (10) extends into the housing and is connected to the half-axle gear (6) through a spline structure, and the other end of the half-axle body (10) is provided with a driving wheel (12).

3. The crawler-type agricultural machinery gearbox according to claim 2, characterized in that: A first flange (42) is provided at one end of the half-axle bridge tube (9), and the first flange (42) is connected to the side cover (4) by bolts; the first flange (42) and the side cover (4) are both connected to the outer ring of one of the third bearings (11).

4. The crawler-type agricultural machinery gearbox according to claim 3, characterized in that: The other end of the half-shaft bridge barrel (9) is provided with a second flange (13) and a third flange (14), the second flange (13) is fixed on the half-shaft bridge barrel (9), and the third flange (14) is connected to the second flange (13) by bolts; the second flange (13) and the third flange (14) are both connected to the outer ring of another third bearing (11); an oil seal (15) and a shaft sleeve (16) are provided in the third flange (14), the oil seal (15) is sleeved on the shaft sleeve (16), and the shaft sleeve (16) is sleeved on the half-shaft body (10).

5. The crawler-type agricultural machinery gearbox according to claim 4, characterized in that: The half-shaft body (10) is also provided with a shaft shoulder (17), and the other third bearing (11) is located between the shaft shoulder (17) and the shaft sleeve (16).

6. The crawler-type agricultural machinery gearbox according to claim 5, characterized in that: The half-shaft body (10) is also provided with a retaining ring (18), and the retaining ring (18) is located on a side of the driving wheel (12) away from the third flange (14).

7. The crawler-type agricultural machinery gearbox according to claim 1, characterized in that: The speed change mechanism comprises an input gear shaft (19), a first shaft (20), a second shaft (21), a toothed shaft (22) and an output gear shaft (24); the input gear shaft (19) and the first shaft (20) are connected via gear transmission; the first shaft (20) and the second shaft (21) are connected via a speed change gear set; the second shaft (21) and the toothed shaft (22) are connected via gear transmission; a toothed clutch (44) is provided on the toothed shaft (22); sliding gears are provided on both sides of the toothed clutch (44); The main housing (1) is provided with a gear (43), the sliding gear (43) is loosely sleeved on the toothed shaft (22), the side surfaces of the sliding gear (43) can mesh with the toothed clutch (44), each sliding gear (43) corresponds to and meshes with an output gear shaft (24); brakes (23) are also provided on both sides of the main housing (1), each sliding gear (43) corresponds to and is connected with a brake (23); each output gear shaft (24) corresponds to and meshes with a half-shaft gear (6).

8. The crawler-type agricultural machinery gearbox according to claim 7, characterized in that: The speed change gear set comprises a first gear driving gear (25), a third gear driving gear (27) and a second gear driving gear (28) which are loosely mounted on a first shaft (20), and also comprises a first gear passive gear (30), a third gear passive gear (31) and a second gear passive gear (32) which are fixed on the second shaft (21); the first gear driving gear (25) is meshed with the first gear passive gear (30), the second gear driving gear (28) is meshed with the second gear passive gear (32), and the third gear driving gear (27) is meshed with the second gear passive gear (31). ) is meshed with the third gear driven gear (31); a third gear meshing gear sleeve (26) is provided between the first gear driving gear (25) and the third gear driving gear (27), and the third gear meshing gear sleeve (26) can slide along its own axial direction to mesh with the first gear driving gear (25) or the third gear driving gear (27); a second gear meshing gear sleeve (29) is provided on one side of the second gear driving gear (28), and the second gear meshing gear sleeve (29) can slide along its own axial direction to mesh with the second gear driving gear (28).

9. The crawler-type agricultural machinery gearbox according to claim 7, characterized in that: It also includes a hydraulic continuously variable transmission (33) and an adapter assembly (34), both of which are connected to the main housing (1); the input end of the hydraulic continuously variable transmission (33) is connected to the adapter assembly (34), and the output end of the hydraulic continuously variable transmission (33) is connected to the input gear shaft (19) via a spline structure.

10. The crawler-type agricultural machinery gearbox according to claim 9, characterized in that: The adapter seat assembly (34) comprises a flange (35), a transfer shaft (36) is arranged inside the flange (35), an input wheel (37) is arranged at one end of the transfer shaft (36), the other end of the transfer shaft (36) extends into the main housing (1) and is provided with a spline sleeve (38), the input end of the hydraulic continuously variable transmission (33) extends into the spline sleeve (38) and engages with the spline sleeve; the transfer shaft (36) is connected to the main housing (1) via a fourth bearing (39), and the transfer shaft (36) is connected to the flange (35) via a fifth bearing (40); and the flange (35) and the main housing (1) are provided with stop structures (41) corresponding to each other.

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