CN220168464U - High-horsepower tractor wheel reduction gear - Google Patents

Abstract

The utility model discloses a high horsepower tractor hub reduction gear, which belongs to the field of tractor drive axles, wherein the hub reduction gear adopts a single-row planetary gear structure, a sun gear shaft, a planet gear, a planet carrier, a hub output shaft and a hub gear form a planetary gear train, when the high horsepower tractor hub reduction gear is used, power is firstly transmitted to the planet gear through gear meshing, and the hub gear is fixedly connected with a rear axle main box shell, so that the planet gear drives the planet carrier to rotate in the rotating process of the planet gear, the power is transmitted to the planet carrier from the planet gear, and the planet carrier is connected with the hub output shaft through spline meshing, so that the power is transmitted to the hub output shaft from the sun gear shaft, and meanwhile, the speed reduction and torque increase functions are realized; under the limit of limited space size, the requirements of large transmission ratio and high power performance of the high-horsepower tractor are successfully met, the high-horsepower power gear shifting main box is successfully matched, and the high-horsepower power gear shifting main box is successfully subjected to the off-line experiment through the related bridge box assembly, so that the high-power gear shifting main box has good popularization and application values.

Description

High-horsepower tractor wheel reduction gear

Technical Field

The utility model belongs to the field of tractor drive axles, and particularly relates to a high-horsepower tractor hub reduction gear.

Background

The tractor hub reduction gear is an important component of a tractor drive axle, is a last-stage reduction and torque-increasing device in a tractor transmission system, and is a direct drive device of the tractor. In general, a tractor operates in an environment such as a farming field, and the speed of an actual working condition is low, and the tractor needs to have higher power performance and better trafficability, so that the total transmission ratio of a tractor transmission system is generally required to be larger, and a higher ground clearance is required.

Generally, the horsepower of the conventional tractor is less than 100 horsepower, and in recent years, with the development of the times, the tractor is developed towards high horsepower and intelligent, and the demand of the high horsepower tractor with the horsepower of more than 200 horsepower is increasing. The traditional tractor generally uses a single-stage reduction drive axle, has a simple structure, realizes reduction by using only a pair of bevel gears, and has light weight and good economy. However, high horsepower tractors have higher power performance for the drive train than conventional tractors, requiring greater torque transfer and higher gear ratios. When a large low-gear total transmission ratio is adopted for the whole tractor transmission system, the torques of the transmission, the transmission shaft and other structures are increased, and the structural sizes of the transmission and the transmission shaft are correspondingly increased in order to ensure the normal running of the transmission. In order to avoid oversized transmissions, propeller shafts, etc., it is desirable to maximize the ratio of gear ratios allocated to the drive axles. Therefore, if the transmission structure of the traditional tractor is continuously used, the part of larger transmission ratio is mainly born by the central main reducer, and in order to meet the transmission ratio requirement, the diameter of the main bevel gear is large, so that the manufacturing difficulty is increased, and meanwhile, the quality and the size of the whole drive axle system are too large, so that the trafficability of the high-horsepower tractor in the working environment cannot be met.

Disclosure of Invention

In order to overcome the defects of the technology, the utility model provides the high-horsepower tractor hub reduction gear which can solve the technical problem that the prior art cannot realize higher power performance under the limited space size.

In order to achieve the above purpose, the present utility model adopts the following technical contents:

a high horsepower tractor wheel-side reducer comprises a rear axle main box shell;

a sun gear shaft is inserted in the axial direction of the rear axle main box shell, and a wheel rim gear ring is fixed on the end surface of the rear axle main box shell;

the planet wheel is connected with the sun wheel shaft in a meshed manner;

the planet wheel is connected with a planet carrier;

the input end of the planet carrier is connected to the planet wheel, and the output end of the planet carrier is connected with a wheel edge output shaft in a meshed mode.

Further, a wheel edge shell is sleeved on the wheel edge output shaft, and a plurality of plugs are arrayed in the circumferential direction of the wheel edge shell; the planet carrier is positioned in the wheel side shell; the wheel rim shell is fixedly connected with the wheel rim toothed ring.

Further, a first tapered roller bearing and a second tapered roller bearing are arranged between the hub output shaft and the hub shell; the first tapered roller bearing and the second tapered roller bearing are respectively sleeved on the wheel edge output shaft.

Further, nuts for pre-tightening the first tapered roller bearing and the second tapered roller bearing are arranged on the hub output shaft, and the nuts are connected with the planet carrier through threads.

Further, a first cylindrical pin for preventing the nut from rotating is inserted on the planet carrier.

Further, an oil seal is arranged between the end face of the wheel side shell and the end face of the wheel side output shaft.

Further, a third cylindrical pin is fixed on the end face of the input end of the wheel edge output shaft; the third cylindrical pin is positioned between the hub output shaft and the sun gear shaft, and the end face of the third cylindrical pin is contacted with the end face of the sun gear shaft.

Further, a gap is formed between the planet carrier and the wheel edge output shaft, a steel ball and a fastening screw matched with the steel ball are arranged in the gap, and the fastening screw is inserted into a threaded hole in the end face of the wheel edge output shaft.

Further, the planet wheel is connected with the planet carrier through a cylindrical roller bearing.

Further, the terminal surface circumference of rear axle main tank casing is upwards symmetry to be provided with 2 second cylindric lock.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model provides a high horsepower tractor wheel-side speed reducer, which adopts a single-row planetary gear structure, a sun gear shaft, a planet gear, a planet carrier, a wheel-side output shaft and a wheel-side gear ring form a planetary gear train, when the high horsepower tractor wheel-side speed reducer is used, power is transmitted to the planet gear from the sun gear shaft through gear engagement, and the planet gear is fixedly connected with a rear axle main box shell, so that the planet gear drives the planet carrier to rotate in the rotating process of the high horsepower tractor wheel-side speed reducer, the power is transmitted to the planet carrier from the planet gear, and the planet carrier is connected with the wheel-side output shaft through spline engagement, so that the power is transmitted to the wheel-side output shaft from the sun gear shaft, and meanwhile, the speed reduction and torque increase functions are realized; under the limit of limited space size, the requirements of larger transmission ratio and higher power performance of the high-horsepower tractor are successfully met, the high-horsepower power gear shifting main box is successfully matched, and the high-horsepower power gear shifting main box is successfully subjected to an off-line experiment through a related axle box assembly; the speed reducer has the advantages of simple principle and structure, convenient disassembly and assembly and operation and good popularization and application value.

Preferably, the wheel edge output shaft is sleeved with the wheel edge shell, and a plurality of plugs are arranged on the wheel edge shell, so that the sealing performance of the whole structure can be improved.

Further preferably, the first tapered roller bearing and the second tapered roller bearing are arranged between the hub output shaft and the hub shell, so that the reliability of the hub output shaft in the output process is ensured.

Still further preferably, nuts for pre-tightening the first tapered roller bearing and the second tapered roller bearing are arranged on the hub output shaft, so that pre-tightening force can be provided for the two tapered roller bearings, and the service life of the bearings is effectively ensured.

Still further preferably, the planetary carrier is inserted with the first cylindrical pin, and the first cylindrical pin prevents the nut from loosening due to vibration in the working process, so that the stability of providing pretightening force for the two tapered roller bearings is improved.

Further preferably, an oil seal is arranged between the end face of the wheel side shell and the end face of the wheel side output shaft, and the oil seal adopts a box type combined oil seal, so that the sealing effect of the whole speed reducer is improved.

Further preferably, the utility model adopts the matching mode of the screw tightening screw and the steel ball, fills the axial gap between the planet carrier and the wheel edge output shaft, and can adjust the distance between the wheel edge output shaft and the planet carrier according to actual requirements so as to meet the degree of freedom of the planet carrier, thereby further improving the reliability of the whole speed reducer.

Preferably, a plurality of second cylindrical pins are arranged on the circumferential direction of the end face of the rear axle main box shell, and the second cylindrical pins play a good guiding role when the rear axle main box shell is assembled with the wheel rim gear, so that the assembly of the rear axle main box shell and the wheel rim gear is facilitated.

Drawings

FIG. 1 is a schematic diagram of a wheel-side reducer of a high-horsepower tractor according to an embodiment of the present utility model;

FIG. 2 is an enlarged view of the block indicated by A in FIG. 1 according to an embodiment of the present utility model;

fig. 3 is a side view of a planetary gear train provided by an embodiment of the present utility model.

Reference numerals:

rear axle main box shell-1; wheel rim toothed ring-2; planetary wheels-3; a cylindrical roller bearing 4; a planet carrier-5; a nut-6; wheel side shell-7; oil seal-8; wheel edge output shaft-9; a first tapered roller bearing-10; a second tapered roller bearing-11; a first cylindrical pin-12; a plug-13; a second cylindrical pin-14; a third cylindrical pin-15; sun gear shaft-16; a clinch screw-17; steel ball-18.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the following specific embodiments are used for further describing the utility model in detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

The utility model provides a high-horsepower tractor wheel-side reducer, which comprises a rear axle main box shell 1; the rear axle main box shell 1 is axially inserted with a sun gear shaft 16, in the existing structure, the input end of the sun gear shaft 16 is in spline connection with the output end of the differential mechanism, and the input end of the sun gear shaft 16 is inserted on the geometric central shaft of the rear axle main box shell 1 through an end cover; the end face of the rear axle main box shell 1 is fixed with a wheel edge ring gear 2; the planetary gear 3 is connected with the wheel rim gear ring 2 in a meshed manner, and the planetary gear 3 is connected with the sun gear shaft 16 in a meshed manner; the planet wheel 3 is connected with a planet carrier 5; the input end of the output end of the planet carrier 5 is connected with the planet wheel 3, and the output end of the planet carrier 5 is connected with a wheel edge output shaft 9 in a meshed manner.

Specifically, a wheel edge shell 7 is sleeved on the wheel edge output shaft 9, and a plurality of plugs 13 are arrayed in the circumferential direction of the wheel edge shell 7; the arrangement of the plug 13 can realize the sealing performance of the whole structure, and the planet carrier 5 is positioned in the wheel side shell 7; the wheel rim shell 7 is fixedly connected with the wheel rim gear ring 2.

In order to ensure the reliability of the rim output shaft 9 in the output process, a first tapered roller bearing 10 and a second tapered roller bearing 11 are arranged between the rim output shaft 9 and the rim shell 7; the first tapered roller bearing 10 and the second tapered roller bearing 11 are respectively sleeved on the wheel edge output shaft 9.

In order to effectively ensure the service lives of the two bearings, a nut 6 for pre-tightening a first tapered roller bearing 10 and a second tapered roller bearing 11 is arranged on a hub output shaft 9, and the nut 6 is in threaded connection with a planet carrier 5.

In particular, in order to prevent loosening of the nut 6 due to vibration during operation, a first cylindrical pin 12 for preventing rotation of the nut 6 is inserted into the carrier 5.

In order to further improve the sealing effect of the whole speed reducer, an oil seal 8 is arranged between the end face of the hub shell 7 and the end face of the hub output shaft 9.

Specifically, be fixed with third cylindric lock 15 on the terminal surface of the input of wheel limit output shaft 9, third cylindric lock 15 terminal surface contacts with sun gear shaft 16 terminal surface, like this, the effectual damage risk that reduces wheel limit output shaft 9 has also reduced the manual work of changing the part and time cost, has guaranteed precision, transmission efficiency and the life of reduction gear in the use.

In order to determine the axial position and the axial runout between the planet carrier 5 and the wheel-side output shaft 9, a steel ball 18 and a screw tightening screw 17 matched with the steel ball are arranged in a gap between the planet carrier 5 and the wheel-side output shaft 9, and the vertical displacement of the steel ball 18 is regulated by tightening or loosening the screw tightening screw 17, so that the degree of freedom of movement between the planet carrier 5 and the wheel-side output shaft 9 is met.

In order to ensure the transmission effect, the planet wheel 3 is connected with the planet carrier 5 through a cylindrical roller bearing 4.

2 second cylindrical pins 14 are inserted in the circumferential direction of the end face of the rear axle main box shell 1, and the 2 second cylindrical pins 14 are symmetrically arranged; the second cylindrical pin 14 plays a good guiding role, and facilitates the assembly of the rear axle main box shell 1 and the wheel rim gear ring 2.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present utility model, it should be noted that, if the terms "upper," "lower," "horizontal," "inner," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the term "horizontal" if present does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The utility model is described in further detail below with reference to the attached drawing figures:

examples

In order to solve the technical problem that the prior art cannot realize higher power performance under the limited space size, the design concept of the embodiment is to realize larger transmission ratio and higher ground clearance of a transmission system of a high-horsepower tractor, and often design a drive axle into a transmission system with two-stage speed reduction, namely, a set of hub speed reducer is added in a hub under the condition of maintaining single-stage speed reduction at the center, so that the transmission ratio matching of the whole system is met, the effects of speed reduction and torque increase are also realized, and the driving force of the tractor is improved; in order to meet the reduction requirement of a drive axle of a high-horsepower tractor, the embodiment provides a high-horsepower tractor hub reduction gear, which takes a half-shaft gear as a sun gear input and a planet carrier as an output, and can realize higher power performance requirements under the severe space size limitation, and the specific structure comprises:

the rear axle main box shell 1, a wheel edge tooth ring 2, a planet wheel 3, a cylindrical roller bearing 4, a planet carrier 5, a nut 6, a wheel edge shell 7, an oil seal 8, a wheel edge output shaft 9, a first conical roller bearing 10, a second conical roller bearing 11, a first cylindrical pin 12, a plug 13, a second cylindrical pin 14, a third cylindrical pin 15, a sun gear shaft 16, a fastening screw 17 and a steel ball 18.

The connection relation and the working principle of the components are further explained below with reference to the attached drawings:

as shown in fig. 1, the oil seal 8, the first tapered roller bearing 10 and the second tapered roller bearing 11 are installed between the wheel-side output shaft 9 and the wheel-side shell 7, the oil seal 8 plays a role in sealing, the nut 6 is installed on the wheel-side output shaft 9 to play a role in pre-tightening the tapered roller bearing 10 and the tapered roller bearing 11, and the service lives of the two bearings are effectively guaranteed.

The 3 planetary wheels 3 are respectively arranged on the planetary frame 5 through roller bearings 4 (the roller bearings 4 can adopt double-row cylindrical roller bearings) to form a planetary frame assembly, the planetary frame assembly is arranged inside a wheel side shell 7, the planetary frame 5 and a wheel side output shaft 9 transmit power through a spline and jack up steel balls 18 through screwing a screw tightening screw 17, and the screw tightening screw 17 adopts an inner hexagonal cone end screw tightening screw; the axial position and the clearance of the planet carrier assembly on the wheel-side output shaft 9 are adjusted through the steel balls 18.

The planet wheel 3 is respectively meshed with the wheel rim gear ring 2 and the sun gear shaft 16, wherein the wheel rim gear ring 2 is connected with the wheel rim shell 7 and the rear axle main box shell 1 through bolts, and the wheel rim gear ring 2 and the wheel rim shell 7 are fixedly connected to the rear axle main box shell 1. The second cylindrical pin 14 plays a role in guiding in the assembly process, and the third cylindrical pin 15 is arranged on the wheel edge output shaft 9; the first cylindrical pin 12 (elastic cylindrical pin) is mounted on the carrier 5, thereby preventing the nut 6 from loosening due to vibration during operation.

The embodiment adopts a single-row planetary row structure, designs each parameter of the gear, and realizes higher power performance requirement and larger transmission ratio in an effective space.

The two tapered roller bearings (the first tapered roller bearing 10 and the second tapered roller bearing 11) are preloaded by adopting the mode of the torque-fixing nut 6, whether the pretightening force of the bearings is qualified or not is tested by testing the wheel-side dragging torque, and the service life of the bearings and the axial clearance of the wheel-side output shaft 9 are effectively ensured.

As shown in fig. 2, the axial position and the axial clearance of the planet carrier 5 on the wheel-side output shaft 9 are controlled by adopting a mode of combining the screw 17 with the steel balls 18, and the proper axial position and the proper axial clearance are obtained by measuring by using a measuring instrument.

The second cylindrical pin 14 is arranged on the planet carrier 5, the nut 6 is fixedly connected with the planet carrier 5, and the function of preventing the nut 6 from rotating is effectively achieved. Meanwhile, the third cylindrical pin 15 is arranged at the left end of the hub output shaft 9, and the sun gear shaft is in end face contact with the third cylindrical pin 15 in the working process, so that abrasion is reduced.

The installation process of this embodiment is as follows:

1. placing the spline of the wheel edge output shaft 9 upwards on a fixture for fixing, placing the inner ring of the oil seal 8 into the shaft end of the wheel edge output shaft 9, and pressing in place by a press; the inner ring of the first tapered roller bearing 10 is installed in place;

2. taking a wheel rim shell 7, respectively smashing and installing the outer rings of a first tapered roller bearing 10, a second tapered roller bearing 11 and an outer ring of an oil seal 8;

3. installing 3 plugs 13 on the wheel side shell 7, hoisting the wheel side shell 7, and falling onto the wheel side output shaft 9;

4. the second tapered roller bearing 11 is hot-packed, and is installed in place, the nut 6 is screwed down, and a torque wrench is used for beating 250N.m torque;

5. the third cylindrical pin 15 is mounted at the left end of the wheel edge output shaft 9 in a smashing manner, 5-6 circles of thread locking glue are smeared at the 2-3 buckles at the tail parts of the screw bolts 17, then the screw bolts 17 are screwed down, the steel balls 18 are smeared with lubricating grease and put into ball holes on the wheel edge output shaft 9, the first cylindrical pin 12 is mounted in the planet carrier assembly holes in a smashing manner, the planet carrier assembly is hoisted by a planet carrier hoisting tool and falls into the spline end of the wheel edge output shaft 9, and thus the wheel edge output assembly is formed;

6. measuring the axial runout of the planet carrier assembly on the wheel edge output shaft 9, and adjusting the set screw 17 to meet the axial runout requirement;

7. finally, the wheel edge output assembly, the wheel edge toothed ring 2 and the rear axle main box shell 1 are connected together by bolts.

The working principle of this embodiment is as follows:

as shown in fig. 3, the sun gear shaft 16, the planet gears 3, the planet carrier 5, the wheel edge output shaft 9 and the wheel edge gear ring 2 form a planetary gear train, power is firstly transmitted to the planet gears 3 from the sun gear shaft 16 through gear engagement, and the wheel edge gear ring 2 is fixedly connected with the rear axle main box shell 1, so that the planet gears 3 rotate in the process of driving the planet carrier 5 to rotate, the power is transmitted to the planet carrier 5 from the planet gears 3, and the planet carrier 5 is connected with the wheel edge output shaft 9 through a spline, so that the power is transmitted to the wheel edge output shaft 9 from the sun gear shaft 16, and simultaneously, the speed reduction and torque increase functions are realized.

The embodiment provides a high horsepower tractor wheel reduction, compares with prior art, has following advantage:

(1) The planetary gear mechanism (planetary gear train) is adopted, the requirements of a high-horsepower tractor on a large transmission ratio and high power performance are successfully met under the limit of limited space size, the matching with a high-horsepower power gear shifting main box is successfully completed, and the off-line experiment of a related axle box assembly is successfully carried out.

(2) Compared with the existing product, the utility model optimizes the structure, so that the pretightening force of the two tapered roller bearings of the wheel edge output shaft can be effectively controlled through the round nut; the axial position and the axial runout of the planet carrier assembly are determined by a mode that the screw tightening screw at the inner hexagonal cone end is combined with the steel balls; under the condition that the space is very limited, the round nut is prevented from rotating by adopting a mode of installing an elastic cylindrical pin on the planet carrier, so that the round nut is prevented from loosening due to vibration in the working process; the cylindrical pin is arranged at the left end of the wheel edge output shaft, so that the end face of the sun gear shaft is contacted with the end face of the cylindrical pin, the damage risk of the wheel edge output shaft is effectively reduced, and the labor and time cost for replacing parts is also reduced; thus, the precision, the transmission efficiency and the service life of the planetary gear mechanism in the use process are ensured.

The above embodiment is only one of the implementation manners capable of implementing the technical solution of the present utility model, and the scope of the claimed utility model is not limited to the embodiment, but also includes any changes, substitutions and other implementation manners easily recognized by those skilled in the art within the technical scope of the present utility model.

Claims (10)

1. The wheel-side speed reducer of the high-horsepower tractor is characterized by comprising a rear axle main box shell (1);

a sun gear shaft (16) is inserted in the axial direction of the rear axle main box shell (1), and a wheel edge ring gear (2) is fixed on the end surface of the rear axle main box shell (1);

a planetary gear (3) is connected to the gear rim (2) in a meshed manner, and the planetary gear (3) is connected with the sun gear shaft (16) in a meshed manner;

the planet wheel (3) is connected with a planet carrier (5);

the input end of the planet carrier (5) is connected to the planet wheel (3), and the output end is connected with a wheel edge output shaft (9) in a meshed manner.

2. The high horsepower tractor hub reduction gear according to claim 1, wherein a hub shell (7) is sleeved on the hub output shaft (9), and a plurality of plugs (13) are arranged in a circumferential array of the hub shell (7); the planet carrier (5) is positioned inside the wheel side shell (7); the wheel rim shell (7) is fixedly connected with the wheel rim ring gear (2).

3. The high horsepower tractor hub reduction gear according to claim 2, characterized in that a first tapered roller bearing (10) and a second tapered roller bearing (11) are arranged between the hub output shaft (9) and the hub housing (7); the first tapered roller bearing (10) and the second tapered roller bearing (11) are respectively sleeved on the wheel edge output shaft (9).

4. A high horsepower tractor hub reduction gear according to claim 3, characterized in that the hub output shaft (9) is provided with a nut (6) for pre-tightening the first (10) and second (11) tapered roller bearings, the nut (6) being threadedly connected to the planet carrier (5).

5. The high horsepower tractor hub reduction gear according to claim 4, wherein the planet carrier (5) is inserted with a first cylindrical pin (12) for preventing the nut (6) from rotating.

6. The high horsepower tractor hub reduction gear according to claim 2, wherein an oil seal (8) is provided between the end face of the hub shell (7) and the end face of the hub output shaft (9).

7. The high horsepower tractor hub reduction gear according to claim 2, wherein a third cylindrical pin (15) is fixed on the end face of the input end of the hub output shaft (9); the third cylindrical pin (15) is positioned between the hub output shaft (9) and the sun gear shaft (16), and the end face of the third cylindrical pin is contacted with the end face of the sun gear shaft (16).

8. The high horsepower tractor hub reduction gear according to claim 1, wherein a gap is formed between the planet carrier (5) and the hub output shaft (9), a steel ball (18) and a fastening screw (17) matched with the steel ball are arranged in the gap, and the fastening screw (17) is inserted into a threaded hole in the end face of the hub output shaft (9).

9. A high horsepower tractor hub reduction gear according to claim 1, wherein the planet wheels (3) are connected to the planet carrier (5) by cylindrical roller bearings (4).

10. The high horsepower tractor hub reduction gear according to claim 1, wherein 2 second cylindrical pins (14) are symmetrically arranged on the end face of the rear axle main box housing (1) in the circumferential direction.