Two-gear front drive axle

Abstract

The utility model discloses a front drive axle with two gears, which relates to the technical field of tractors and comprises a planetary structure fixed on a front axle shell, the planetary structure comprises a gear ring, a planetary carrier is arranged on one side in the gear ring, a planetary gear is rotatably arranged on one side, close to the gear ring, of the outer wall of the planetary carrier, and the planetary gear is meshed with the gear ring. A sun gear is arranged at the axis in the gear ring and meshed with the planetary gear, one side of the planet carrier is rotationally connected with a front axle input shaft, a gear shifting mechanism is arranged on the side, close to the front axle input shaft, of the inner wall of the planet carrier and arranged on the front axle input shaft in a sleeving mode, and a sun gear shifting spline is fixedly connected with the sun gear. By means of the arrangement of the gear shifting mechanism, mode switching of two gears can be achieved, different driving conditions and task requirements can be better met, meanwhile, the flexibility of a driving system is improved, and two different traction force and driving force are provided for a tractor under special conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of tractors, and particularly relates to a front drive axle with two gears. Background Art

[0002] The front drive axle of a tractor is an important component of the tractor. Its main function is to transmit the power of the engine to the front wheels to provide traction and driving force, enabling the tractor to travel on various terrains and road conditions. It is usually composed of components such as a differential, a transmission shaft, a wheel hub, and a tire.

[0003] The transmission ratio of the traditional tractor front drive axle is fixed, and the front and rear tires are matched according to the front and rear transmission ratios, with a single configuration. When it is necessary to select and match the front and rear tires for different operation requirements, it is necessary to replace the internal gears to change the transmission ratio, and the replacement process is complex and requires high professionalism. Generally, it is replaced by adjusting and assembling the assembly before leaving the factory. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a front drive axle with two gears, which solves the problems that the transmission ratio of the existing traditional tractor front drive axle is fixed, the front and rear tires are matched according to the front and rear transmission ratios, with a single configuration, and when it is necessary to select and match the front and rear tires for different operation requirements, it is necessary to replace the internal gears to change the transmission ratio, and the replacement process is complex and requires high professionalism.

[0005] To solve the above technical problems, the utility model specifically provides the following technical solutions:

[0006] A front drive axle with two gears includes a planetary structure fixed on the front axle housing. The planetary structure includes a ring gear. On one side inside the ring gear, a planet carrier is provided. On the outer wall of the planet carrier close to the ring gear, planet gears are rotatably arranged. The planet gears are meshed with the ring gear. At the center of the ring gear, a sun gear is provided. The sun gear is meshed with the planet gears. One side of the planet carrier is rotatably connected to a front axle input shaft. On the inner wall of the planet carrier close to the front axle input shaft, a shifting mechanism is provided, and the shifting mechanism is sleeved on the front axle input shaft. The shifting mechanism includes a shifting spline sleeve, a sun gear shifting spline, and a planet carrier spline. The shifting spline sleeve is movably arranged inside the planet carrier. The sun gear shifting spline and the planet carrier spline are respectively located on both sides of the shifting spline sleeve and are both adapted to the shifting spline sleeve. The sun gear shifting spline is fixedly connected to the sun gear, and the planet carrier spline is fixedly connected to the planet carrier.

[0007] As a preferred solution of the utility model, the shifting mechanism has a normal mode and a planetary gear mode. When the shifting spline sleeve cooperates with the sun gear shifting spline, the shifting mechanism is in the normal mode. When the shifting spline sleeve slides to cooperate with the planet carrier spline, the shifting mechanism is in the planetary gear mode.

[0008] As a preferred embodiment of the present utility model, a plurality of planetary gears are provided, and all the planetary gears are uniformly arranged along the inner circumferential direction of the ring gear, and all the planetary gears are rotatably connected to the planet carrier.

[0009] As a preferred embodiment of the present utility model, the sun gear and the ring gear are coaxial, and the sun gear is located between all the planetary gears.

[0010] As a preferred embodiment of the present utility model, an internal spline is provided on one side of the inner wall of the shift spline sleeve, and an external spline is provided on the side of the outer wall of the shift spline sleeve away from the internal spline. The internal spline meshes with the sun gear shift spline, and the external spline meshes with the planet carrier spline.

[0011] As a preferred embodiment of the present utility model, the sun gear shift spline and the sun gear are integrally formed.

[0012] As a preferred embodiment of the present utility model, the planet carrier spline and the planet carrier are integrally formed.

[0013] As a preferred embodiment of the present utility model, the front axle input shaft and the planet carrier are rotatably connected through a bearing.

[0014] The present utility model has the following beneficial effects compared with the prior art:

[0015] Through the setting of the shifting mechanism, the present utility model can realize the mode switching between two gears, better meet different driving conditions and task requirements, and at the same time increase the flexibility of the drive system, providing two different traction forces and driving forces for the tractor under special circumstances. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can be obtained according to the provided drawings without creative efforts.

[0017] Figure 1 FIG. 1 is a schematic diagram of the overall structure of a front drive axle with two gears provided by an embodiment of the present utility model;

[0018] Figure 2 FIG. 2 is a schematic diagram of the structure of the shifting mechanism provided by an embodiment of the present utility model;

[0019] Figure 3 FIG. 3 is a schematic diagram of the three-dimensional structure of a front drive axle with two gears provided by an embodiment of the present utility model;

[0020] Figure 4 The figure is a partial structural schematic diagram of the planetary structure provided by an embodiment of the present utility model;

[0021] Figure 5 The figure is a sectional structural schematic diagram of the shifting mechanism provided by an embodiment of the present utility model;

[0022] Figure 6 The figure is a connection structural schematic diagram of the shifting spline sleeve and the front axle input shaft provided by an embodiment of the present utility model;

[0023] Figure 7 The figure is a connection structural schematic diagram of the planet carrier and the planet carrier spline provided by an embodiment of the present utility model.

[0024] The reference numerals in the figure are respectively represented as follows:

[0025] 1. Ring gear; 2. Planet gear; 3. Planet carrier; 4. Sun gear; 5. Shifting spline sleeve; 6. Front axle input shaft; 7. Sun gear shifting spline; 8. Planet carrier spline. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0027] As Figures 1 to 7 shown, the present utility model provides a two-speed front drive axle, including a planetary structure fixed on the front axle housing. The planetary structure includes a ring gear 1. On one side inside the ring gear 1, a planet carrier 3 is provided. On the outer wall of the planet carrier 3 close to the ring gear 1, a planet gear 2 is rotatably provided. The planet gear 2 meshes with the ring gear 1. At the center of the inner part of the ring gear 1, a sun gear 4 is provided. The sun gear 4 meshes with the planet gear 2. One side of the planet carrier 3 is rotatably connected to a front axle input shaft 6. The front axle input shaft 6 is rotatably connected to the planet carrier 3 through a bearing. On the side of the inner wall of the planet carrier 3 close to the front axle input shaft 6, a shifting mechanism is provided, and the shifting mechanism is sleeved on the front axle input shaft 6. The shifting mechanism includes a shifting spline sleeve 5, a sun gear shifting spline 7, and a planet carrier spline 8. The shifting spline sleeve 5 is movably provided inside the planet carrier 3. The sun gear shifting spline 7 and the planet carrier spline 8 are respectively located on both sides of the shifting spline sleeve 5 and are both adapted to the shifting spline sleeve 5. The sun gear shifting spline 7 is fixedly connected to the sun gear 4, and the planet carrier spline 8 is fixedly connected to the planet carrier 3.

[0028] The shift mechanism has a normal mode and a planetary gear mode. When the shift spline sleeve 5 cooperates with the sun gear shift spline 7, the shift mechanism is in the normal mode. When the shift spline sleeve 5 slides to cooperate with the planet carrier spline 8, the shift mechanism is in the planetary gear mode.

[0029] The transmission ratio of the existing front drive axle of a tractor is fixed, and the front and rear tires need to be matched according to the front and rear transmission ratio. When different operations require the selection of front and rear tires, the internal gears need to be replaced to change the transmission ratio. However, the replacement process is relatively complicated and requires high professionalism. If the transmission ratio needs to be changed, it can only be returned to the factory for replacement, which is complicated and time-consuming. In view of this problem, the utility model provides a two-speed front drive axle and a shift mechanism; the shift mechanism is provided with two gears, a normal mode and a planetary gear mode. When shifting, the shift spline sleeve 5 is slidably matched with the front axle input shaft 6, and the shift spline sleeve 5 shifts gears by sliding on the front axle input shaft 6 to engage or disconnect with the sun gear 4 and the planetary carrier 3.

[0030] An inner spline is provided on one side of the inner wall of the shift spline sleeve 5 , and an outer spline is provided on the side of the outer wall of the shift spline sleeve 5 away from the inner spline. The inner spline meshes with the sun gear shift spline 7 , and the outer spline meshes with the planet carrier spline 8 .

[0031] One side of the sun gear 4 slides with the input shaft of the conventional front drive axle to transmit power, and the other side is designed with a sun gear shift spline 7. The outer spline of the sun gear shift spline 7 transmits power with the inner spline of the shift spline sleeve 5.

[0032] A planet carrier spline 8 is arranged on the right side of the planet carrier 3 , and power is transmitted to the outer spline of the shift spline sleeve 5 through the inner spline of the planet carrier spline 8 .

[0033] Shifting principle:

[0034] 1. Normal mode: The shift spline sleeve 5 slides to the left and slides with the inner spline on the sun gear shift spline 7. The power is transmitted to the sun gear 4 through the front axle input shaft 6. The sun gear 4 slides with the original front drive axle input shaft. The chassis power is transmitted to the front drive axle to achieve the original drive axle speed ratio. In normal mode, the tractor is equipped with front and rear tires of the original specifications.

[0035] 2. Planetary gear mode: The shift spline sleeve 5 slides to the right, and slides with the inner spline of the planetary carrier spline 8 set on the right side of the planetary carrier 3 to transmit power. The planetary carrier 3 transmits the power to the sun gear 4 through the planetary gear 2. The sun gear 4 slides with the original front drive axle input shaft, and the chassis power is transmitted to the front drive axle to realize the original drive axle speed ratio power transmission.

[0036] In the planetary gear mode: After passing through the planetary gear mode, the speed ratio becomes larger compared to the original speed ratio, and the front wheel speed slows down. When the front wheel tire specifications remain unchanged, triangular crawlers can be optionally installed on the rear wheels; alternatively, when the rear wheel specifications remain unchanged, the front wheel specifications can be increased. The two-speed front drive axle increases the variety of optional tires.

[0037] The utility model uses a planetary structure for coaxial design. The appearance of the front drive axle changes little, and it can be replaced with the original front drive axle without damage. The setting of the shifting mechanism can better meet different driving conditions and task requirements, and at the same time increases the flexibility of the drive system, providing two different traction forces and driving forces for the tractor under special circumstances.

[0038] A plurality of planetary gears 2 are provided, and all the planetary gears 2 are uniformly arranged along the inner circumferential direction of the ring gear 1, and all the planetary gears 2 are rotatably connected to the planet carrier 3.

[0039] The sun gear 4 and the ring gear 1 are coaxial, and the sun gear 4 is located between all the planetary gears 2.

[0040] Through the cooperation of the sun gear 4 and the plurality of planetary gears 2, power transmission is achieved, so that the gear ratio of the wheels can be reasonably selected and designed to achieve different transmission effects, such as speed increase, speed reduction, and reverse transmission.

[0041] On one side of the inner wall of the shift spline sleeve 5, internal splines are provided. On the side of the outer wall of the shift spline sleeve 5 away from the internal splines, external splines are provided. The internal splines are engaged with the sun gear shift spline 7, and the external splines are engaged with the planet carrier spline 8. The detachable connection of the shift spline sleeve 5 is realized and used to transmit torque and motion.

[0042] The sun gear shift spline 7 and the sun gear 4 are integrally formed.

[0043] The planet carrier spline 8 and the planet carrier 3 are integrally formed.

[0044] The sun gear shift spline 7 and the planet carrier spline 8 are integrally formed with the sun gear 4 and the planet carrier 3 respectively, which can simplify the manufacturing process, improve the assembly accuracy, and greatly reduce the production cost.

[0045] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present application, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present application.

Claims

1. A two-speed front drive axle, comprising a planetary structure fixed to a front axle housing, characterized in that: The planetary structure comprises a ring gear (1), a planet carrier (3) is arranged on one side of the inner part of the ring gear (1), a planetary gear (2) is rotatably arranged on the outer wall of the planet carrier (3) on the side close to the ring gear (1), the planetary gear (2) is meshed with the ring gear (1), a sun gear (4) is arranged at the inner axis of the ring gear (1), the sun gear (4) is meshed with the planetary gear (2), one side of the planet carrier (3) is rotatably connected to the front axle input shaft (6), and a shifting mechanism is arranged on the inner wall of the planet carrier (3) on the side close to the front axle input shaft (6). The invention relates to a gear shifting mechanism, wherein the gear shifting mechanism is sleeved on a front axle input shaft (6), the gear shifting mechanism comprises a gear shifting spline sleeve (5), a sun gear shifting spline (7) and a planet carrier spline (8), the gear shifting spline sleeve (5) is movably arranged inside a planet carrier (3), the sun gear shifting spline (7) and the planet carrier spline (8) are respectively located on both sides of the gear shifting spline sleeve (5) and are both adapted to the gear shifting spline sleeve (5), the sun gear shifting spline (7) is fixedly connected to the sun gear (4), and the planet carrier spline (8) is fixedly connected to the planet carrier (3).

2. A two-speed front drive axle according to claim 1, characterized in that: The shift mechanism has a normal mode and a planetary gear mode. When the shift spline sleeve (5) cooperates with the sun gear shift spline (7), the shift mechanism is in the normal mode. When the shift spline sleeve (5) slides to cooperate with the planet carrier spline (8), the shift mechanism is in the planetary gear mode.

3. The two-speed front drive axle according to claim 1, characterized in that: A plurality of the planetary gears (2) are provided, and all the planetary gears (2) are evenly arranged along the inner circumferential direction of the ring gear (1), and all the planetary gears (2) are rotatably connected to the planet carrier (3).

4. The two-speed front drive axle according to claim 1, characterized in that: The sun gear (4) is coaxial with the ring gear (1), and the sun gear (4) is located between all the planetary gears (2).

5. The two-speed front drive axle according to claim 1, characterized in that: An inner spline is provided on one side of the inner wall of the shift spline sleeve (5), and an outer spline is provided on the side of the outer wall of the shift spline sleeve (5) away from the inner spline. The inner spline meshes with the sun gear shift spline (7), and the outer spline meshes with the planet carrier spline (8).

6. The two-speed front drive axle according to claim 1, characterized in that: The sun gear shift spline (7) and the sun gear (4) are integrally formed.

7. The two-speed front drive axle according to claim 1, characterized in that: The planet carrier splines (8) and the planet carrier (3) are integrally formed.

8. The two-speed front drive axle according to claim 1, characterized in that: The front axle input shaft (6) is rotatably connected to the planet carrier (3) via a bearing.

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