Two-gear front drive axle

Abstract

The invention 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. Through the arrangement of the gear shifting mechanism, mode switching of two gears can be achieved, different driving conditions and task requirements are 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 invention relates to the technical field of tractors, and in particular 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, so that the tractor can travel on various terrains and road conditions. It is usually composed of differentials, drive shafts, wheels, tires and other components.

[0003] Traditional tractors have a fixed front drive axle transmission ratio, and the front and rear tires are matched according to the front and rear transmission ratio, with a single configuration. When different operating requirements require the selection of front and rear tires, the internal gears need to be replaced to change the transmission ratio. The replacement process is complex and requires high professionalism, and is generally replaced by adjusting the assembly before leaving the factory. Summary of the invention

[0004] The purpose of the present invention is to provide a two-speed front drive axle, which solves the problem 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 ratio, the configuration is single, and when the front and rear tires need to be selected for different operating needs, the internal gears need to be replaced to change the transmission ratio, and the replacement process is complicated and requires high professionalism.

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] A two-speed front drive axle comprises a planetary structure fixed on a front axle housing, the planetary structure comprises a gear ring, a planet carrier is arranged on one side inside the gear ring, a planetary gear is rotatably arranged on an outer wall of the planet carrier close to the gear ring, the planetary gear is meshed with the gear ring, a sun gear is arranged at an axis center inside the gear ring, the sun gear is meshed with the planetary gear, one side of the planet carrier is rotatably connected to the front axle input shaft, a shift mechanism is arranged on the side of the inner wall of the planet carrier close to the front axle input shaft, and the shift mechanism is sleeved on the front axle input shaft, the shift mechanism comprises a shift spline sleeve, a sun gear shift spline and a planet carrier spline, the shift spline sleeve is movably arranged inside the planet carrier, the sun gear shift spline and the planet carrier spline are respectively located on both sides of the shift spline sleeve, and both are adapted to the shift spline sleeve, the sun gear shift 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 present invention, the shift mechanism has a normal mode and a planetary gear mode. When the shift spline sleeve cooperates with the sun gear shift spline, the shift mechanism is in the normal mode. When the shift spline sleeve slides to cooperate with the planetary carrier spline, the shift mechanism is in the planetary gear mode.

[0008] As a preferred solution of the present invention, a plurality of planetary gears are provided, all of which are evenly arranged along the inner circumferential direction of the ring gear, and all of which are rotatably connected to the planet carrier.

[0009] As a preferred solution of the present invention, the sun gear is coaxial with the ring gear, and the sun gear is located between all the planetary gears.

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

[0011] As a preferred solution of the present invention, the sun gear shift spline and the sun gear are integrally formed.

[0012] As a preferred solution of the present invention, the planet carrier splines and the planet carrier are integrally formed.

[0013] As a preferred solution of the present invention, the front axle input shaft is rotatably connected to the planet carrier via a bearing.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention can realize mode switching of two gears by setting the shift mechanism, so as to better meet different driving conditions and task requirements, and at the same time increase the flexibility of the drive system, and provide 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 implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0017] Figure 1 An overall structural schematic diagram of a two-speed front drive axle is provided for an embodiment of the present invention;

[0018] Figure 2 A structural schematic diagram of a shift mechanism is provided for an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of a three-dimensional structure of a front drive axle with two gears is provided for an embodiment of the present invention;

[0020] Figure 4A schematic diagram of a local structure of a planetary structure is provided for an embodiment of the present invention;

[0021] Figure 5 A schematic cross-sectional structure diagram of a shift mechanism is provided for an embodiment of the present invention;

[0022] Figure 6 A schematic diagram of the connection structure between the shift spline sleeve and the front axle input shaft is provided for an embodiment of the present invention;

[0023] Figure 7 A schematic diagram of the connection structure between a planet carrier and a planet carrier spline is provided for an embodiment of the present invention.

[0024] The numbers in the figure represent the following:

[0025] 1. Ring gear; 2. Planetary gear; 3. Planet carrier; 4. Sun gear; 5. Shift spline sleeve; 6. Front axle input shaft; 7. Sun gear shift spline; 8. Planet carrier spline. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figures 1 to 7 As shown, the present invention provides a two-speed front drive axle, including a planetary structure fixed on a front axle housing, the planetary structure including a gear ring 1, a planet carrier 3 is arranged on one side of the inner part of the gear ring 1, a planetary gear 2 is rotatably arranged on the outer wall of the planet carrier 3 close to the gear ring 1, the planetary gear 2 is meshed with the gear ring 1, a sun gear 4 is arranged at the inner axis of the gear ring 1, the sun gear 4 is meshed with the planetary gear 2, one side of the planet carrier 3 is rotatably connected to a front axle input shaft 6, and the front axle input shaft 6 and the planet carrier 3 are rotatable through bearings The planet carrier 3 is connected to the front axle input shaft 6 by a shift mechanism on the inner wall thereof, and the shift mechanism is sleeved on the front axle input shaft 6. The shift mechanism comprises a shift spline sleeve 5, a sun gear shift spline 7 and a planet carrier spline 8. The shift spline sleeve 5 is movably arranged inside the planet carrier 3. The sun gear shift spline 7 and the planet carrier spline 8 are respectively located on both sides of the shift spline sleeve 5 and are both matched with the shift spline sleeve 5. The sun gear shift 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. This operation is complicated and time-consuming. To solve this problem, the present invention provides a two-speed front drive axle and sets a shift mechanism; the shift mechanism sets 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 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 planetary gear mode: After the planetary gear mode, the speed ratio becomes larger than the original speed ratio, and the front wheel speed becomes slower. Under the condition that the front wheel tire specifications remain unchanged, the rear wheel specifications can be optionally equipped with triangular crawlers; or the front wheel specifications can be increased under the condition that the rear wheel specifications remain unchanged. The front drive axle with two gears increases the types of optional tires.

[0037] The present invention uses a planetary structure for coaxial design, and the front drive axle has little change in appearance, and can be replaced with the original front drive axle without loss. The setting of the shift mechanism can better meet different driving conditions and task requirements, while increasing the flexibility of the drive system, providing two different traction forces and driving forces for the tractor under special circumstances.

[0038] There are multiple planetary gears 2 , all of which are evenly arranged along the inner circumferential direction of the ring gear 1 , and all of the planetary gears 2 are rotatably connected to the planet carrier 3 .

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

[0040] Power transmission is achieved through the cooperation between the sun gear 4 and the multiple planetary gears 2, 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] 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. The shift spline sleeve 5 is detachably connected and used to transmit torque and motion.

[0042] The sun gear shift spline 7 is integrally formed with the sun gear 4 .

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

[0044] The sun gear shift spline 7 and the planet carrier spline 8 are formed integrally 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 intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall 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.

Images