A front drive axle and tractor

Abstract

This invention provides a front drive axle and a tractor. It includes a first half-shaft, a second half-shaft, a differential, a first clutch, and a second clutch. The first clutch is located between the output gear of the differential and the first half-shaft, and the second clutch is located between the output gear of the differential and the second half-shaft. By setting the first and second clutches between the output gear of the differential and the first and second half-shafts, the invention allows the differential to operate normally when both clutches are engaged simultaneously. The differential housing drives the differential, enabling normal tractor movement. When the tractor needs to turn, the first clutch is disengaged, and the second clutch engages normally. At this time, the differential only transmits power to the second half-shaft, and the corresponding drive wheel of the second half-shaft operates normally, while power to the first half-shaft is interrupted, and the corresponding drive wheel of the second half-shaft does not rotate, thereby reducing the left-turn radius.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery, and in particular to a front drive axle and a tractor. Background Technology

[0002] The steering performance of a tractor directly affects its operating efficiency and maneuverability. In existing four-wheel drive tractors, when steering in four-wheel drive mode, the front axle is connected to the transmission via a transfer case. The front drive axle adjusts the speed difference between the two front drive wheels through a differential to achieve steering. During steering, both drive wheels are simultaneously powered, thus increasing the tractor's turning radius. Therefore, it is necessary to provide a front drive axle and tractor that overcome the aforementioned shortcomings. Summary of the Invention

[0003] The purpose of this invention is to provide a front drive axle and a tractor.

[0004] According to one aspect of the present invention, a front drive axle is provided, comprising: First half-shaft; The second half-shaft is spaced apart from the first half-shaft; An input gear, which is loosely fitted onto the first half-shaft; A differential housing is loosely fitted onto the first and second half-shafts and can rotate around their central axis. The differential housing is connected to the input gear and rotates as a whole. A planetary gear set is disposed within the differential housing. The planetary gear set includes a planetary gear shaft and at least two planetary gears. The two ends of the planetary gear shaft are disposed on the differential housing. The two planetary gears are mounted on the same planetary gear shaft. The planetary gear set as a whole rotates with the differential housing, and the planetary gears can rotate around the planetary gear shaft. The first output gear is loosely fitted on the first half-shaft and meshes with the planetary gear; The second output gear is loosely fitted on the second half-shaft and meshes with the planetary gear; The first clutch is located between the first output gear and the first half-shaft and is used to connect or disconnect the power transmission. The second clutch is located between the second output gear and the second half-shaft to connect or disconnect the power transmission.

[0005] Preferably, the first output gear and the second output gear have the same structure and are arranged in a mirror image. The first output gear includes: a body portion whose inner ring is sleeved on the first half shaft through a first bearing, a meshing portion located on the side of the body portion near the planetary gear and meshing with the planetary gear, and a slot portion located on the other side of the body portion.

[0006] Preferably, the first clutch and the second clutch have the same structure, the first clutch is located in the mounting space formed by the first output gear and the differential housing, and the second clutch is located in the mounting space formed by the second output gear and the differential housing.

[0007] Preferably, the first clutch includes: The piston part has an inner ring that is fitted onto the first half-shaft and can move axially along the first half-shaft, and an outer ring that fits against the inner wall of the differential housing. A hydraulic chamber, which is a closed cavity formed between the piston portion, the differential housing, and the first half-shaft; The friction assembly includes a first friction plate disposed in the slot and rotating synchronously with the first output gear, and a second friction plate disposed on the first half-shaft and rotating synchronously with the first half-shaft, wherein the first friction plate and the second friction plate are arranged alternately. An elastic element is disposed between the first output gear and the piston portion to drive the piston portion to remain away from the friction assembly.

[0008] Preferably, the first half-shaft includes a first shaft portion and a first end portion that are separately disposed. The first end portion is sleeved on the first shaft portion and connected by a spline. The first end portion is inserted into the differential housing and extends to the slot portion of the first output gear. The first clutch is disposed on the first end portion. The second half-shaft includes a second shaft portion and a second end portion that are separately disposed. The second end portion is sleeved on the second shaft portion and connected by a spline. The second end portion is inserted into the differential housing and extends to the slot portion of the second output gear. The second clutch is disposed on the second end portion.

[0009] Preferably, it also includes an axle housing, the two ends of which are connected to the wheel-side reducer housing, and a differential housing, a first half-shaft, and a second half-shaft are provided inside the axle housing.

[0010] Preferably, a first bracket and a second bracket are fixedly provided on the lower part of the inner wall of the axle housing. The first bracket and the inner wall of the axle housing form a first mounting hole, and the second bracket and the inner wall of the axle housing form a second mounting hole. The two ends of the differential housing are respectively sleeved on the first half-shaft and the second half-shaft and maintain relative rotation. The two ends of the differential housing are loosely sleeved inside the first mounting hole and the second mounting hole. The differential housing and the first bracket and the second bracket maintain relative rotation.

[0011] Preferably, a second bearing, a connecting block, a limiting ring, and a limiting plate are sequentially provided between the end of the differential housing and the first bracket from the differential housing toward the wheel-side reducer side. The inner wall of the limiting ring is provided with a plurality of internal tooth grooves. The limiting plate includes an integrally formed fixing part, an extension part, and a limiting part. The fixing part is fixed to the first bracket by bolts. The extension part extends along the outer wall of the first bracket and the limiting ring to the internal tooth groove. The limiting part is engaged in the internal tooth groove.

[0012] Preferably, the axle housing is provided with a first flow channel, the outer circumferential surface of the connecting block is provided with a transition flow channel, the transition flow channel is connected to the first flow channel, the inner circumferential surface of the connecting block is provided with an annular flow channel, the connecting block is provided with a second flow channel connecting the annular flow channel and the transition flow channel, and the end of the differential housing is provided with a third flow channel, the third flow channel connecting the second annular flow channel and the hydraulic chamber.

[0013] According to another aspect of the invention, a tractor is provided, including the aforementioned front drive axle.

[0014] Compared with the prior art, the front drive axle and tractor provided by the present invention have the following beneficial effects: This invention utilizes a first clutch and a second clutch located between the output gear and the half-shaft. When both clutches are engaged simultaneously, the differential operates normally, with the differential housing driving the differential's operation, enabling the tractor to move normally. When the tractor needs to make a small-radius turn, the first clutch is disengaged, and the second clutch engages normally. At this time, the differential only transmits power to the second half-shaft, allowing the corresponding drive wheel to operate normally, while power to the first half-shaft is interrupted, causing the corresponding drive wheel to spin without power, thus reducing the left-turn radius. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of the principle of the front drive axle of the present invention; Figure 2 This is a schematic diagram of the front drive axle of the present invention; Figure 3 This is one of the cross-sectional schematic diagrams of the front drive axle of the present invention; Figure 4 This is one of the cross-sectional schematic diagrams of the central transmission mechanism of the present invention; Figure 5 This is one of the structural schematic diagrams of the differential of the present invention; Figure 6 The first clutch of the present invention ( Figure 5 One of the enlarged views of a portion of region A in the middle; Figure 7 The differential mounting position of this invention ( Figure 5 Partial schematic diagram of area B in the middle; Figure 8 For the differential oil supply circuit of the present invention ( Figure 5 Partial schematic diagram of area C in the middle; Figure 9 This is a second cross-sectional schematic diagram of the front drive axle of the present invention; Figure 10 This is a second cross-sectional schematic diagram of the central transmission mechanism of the present invention; Figure 11 This is the second schematic diagram of the differential of the present invention; Figure 12 The first clutch of the present invention ( Figure 11 A second enlarged view of a section in region D; Figure 13 This is a schematic diagram of the tractor of the present invention.

[0016] Explanation of reference numerals in the attached figures: 100. Central transmission mechanism; 200. Wheel-side reducer; 300. Drive shaft; 1. Bridge housing; 11a. First bracket; 11b. Second bracket; 111a. First latch; 111b. Second latch; 12a. First mounting hole; 12b. Second mounting hole; 13a. First positioning platform; 13b. Second positioning platform; 131a. First step; 131b. Second step; 2. Input gear; 3. Differential housing; 31. Second bearing; 32. Connecting block; 33. Limiting ring; 331. Internal tooth groove; 34. Limiting plate; 341. Fixing part; 342. Extension part; 343. Limiting part; 4a, First half-shaft; 41a, First shaft portion; 42a, First end portion; 4b, Second half-shaft; 41b, Second shaft portion; 42b, Second end portion; 5. Planetary gear set; 51. Star wheel shaft; 52. Planetary gear; 6a. First output gear; 6b. Second output gear; 61. Body part; 62. Meshing part; 63. Groove part; 64. First bearing; 7a. First clutch; 7b. Second clutch; 71. Piston section; 72. Hydraulic chamber; 73. Friction assembly; 73a. First friction plate; 73b. Second friction plate; 74. Elastic element; 81. First flow channel; 82. Transition flow channel; 821. Snap ring; 822. Sealing ring; 83. Second flow channel; 84. Annular flow channel; 841. Oil seal; 85. Third flow channel. Detailed Implementation

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".

[0019] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0020] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0023] See Figures 1 to 13 This embodiment provides a front drive axle, which is mainly used in tractors. Of course, for those skilled in the art, the front drive axle is not limited to tractors, but can also be used in agricultural equipment such as combine harvesters, harvesters, and loaders, or construction equipment such as excavators, dump trucks, bulldozers, and graders, or forestry equipment such as logging and timber harvesting machines.

[0024] See appendix Figures 1 to 3 The front drive axle includes: an axle housing 1, a central transmission mechanism 100, a wheel-side reducer 200, a first half-shaft 4a, a second half-shaft 4b, and a drive shaft 300. The axle housing 1 is operable to receive the central transmission mechanism 100 and the wheel-side reducer 200. The power output from the engine is transmitted to the front drive axle after being changed by the transmission device, and then transmitted to the first half-shaft 4a and the second half-shaft 4b through the transfer case and the drive shaft 300. In the front drive axle, the power is further changed by the differential and then transmitted to the first half-shaft 4a and the second half-shaft 4b. The first half-shaft 4a and the second half-shaft 4b are respectively connected to the wheel-side reducer 200 and transmit the power to the ground through the wheels.

[0025] See appendix Figure 4 The differential connected to the drive shaft 300 includes: an input gear 2, a differential housing 3, a planetary gear set 5, a first output gear 6a, a second output gear 6b, a first clutch 7a, and a second clutch 7b. The input gear 2 meshes with the gear on the drive shaft 300 and is loosely fitted on the first half-shaft 4a, rotating around its central axis. The differential housing 3 is attached to the input gear 2 so as to rotate integrally with the ring gear. The differential housing 3 is loosely fitted on the first half-shaft 4a and the second half-shaft 4b and can rotate around its central axis. The planetary gear set 5 is disposed within the differential housing 3. The planetary gear set 5 includes a planetary gear shaft 51 and at least two planetary gears 52. The planetary gear shaft 51... The planetary gear set 5 is mounted on the differential housing 3 at both ends. Two planetary gears 52 are mounted on the same planetary gear shaft 51. The planetary gear set 5 rotates as the differential housing 3 rotates, and the planetary gears 52 can rotate around the planetary gear shaft 51. The first output gear 6a is loosely fitted on the first half-shaft 4a and meshes with the planetary gear 52. The first clutch 7a is located between the first output gear 6a and the first half-shaft 4a to connect or disconnect the power transmission. The second output gear 6b ​​is loosely fitted on the second half-shaft 4b and meshes with the planetary gear 52. The second clutch 7b is located between the second output gear 6b ​​and the second half-shaft 4b to connect or disconnect the power transmission.

[0026] When the tractor is moving normally, the first clutch 7a and the second clutch 7b are engaged. Power can be transmitted through the input gear 2, differential housing 3, planetary gear set 5, planetary gear 52, first output gear 6a and / or second output gear 6b, and ultimately to the first half-shaft 4a and / or second half-shaft 4b. When the tractor turns left or right, the first clutch 7a and the second clutch 7b are engaged, and the planetary gear 52 can rotate around its own axis. One of the first output gear 6a or the second output gear 6b ​​ensures that the outer wheel rotates faster than the inner wheel. When the tractor turns left or right at double speed to reduce the turning radius, the first clutch 7a or the second clutch 7b corresponding to the inner wheel is disengaged, and the inner wheel is in a powerless state. The first output gear 6a or the second output gear 6b ​​ensures that the outer wheel rotates faster than the inner wheel, thereby reducing the overall turning radius of the wheels, further increasing the speed difference between the two wheels, significantly reducing the turning radius, and improving the flexibility of field operations.

[0027] See appendix Figure 7 A first bracket 11a and a second bracket 11b are fixedly provided on the lower part of the inner wall of the axle housing 1. The first bracket 11a forms a first mounting hole 12a with the inner wall of the axle housing 1, and the second bracket 11b forms a second mounting hole 12b with the inner wall of the axle housing 1. The two ends of the differential housing 3 are respectively sleeved on the first half-shaft 4a and the second half-shaft 4b and maintain relative rotation. The two ends of the differential housing 3 are loosely sleeved inside the first mounting hole 12a and the second mounting hole 12b. The two ends of the differential housing 3 are connected to the first mounting hole 12a and the second mounting hole 12b through two second bearings 31. The differential housing 3 maintains relative rotation with the first bracket 11a and the second bracket 11b.

[0028] See appendix Figure 6 The differential housing 3 is provided with a second bearing 31, a connecting block 32, a limiting ring 33, and a limiting piece 34 in sequence from the differential housing 3 toward the wheel-side reducer 200 between the end of the differential housing 3 and the first bracket 11a. The inner ring of the second bearing 31 is interference-fitted with the part of the differential housing 3, and the outer ring of the second bearing 31 is fixed in the first mounting hole 12a. The outer ring of the connecting block 32 is fixedly installed in the first mounting hole 12a, and the inner ring of the connecting block 32 is rotatably disposed with the end of the differential housing 3. The limiting ring 33 is installed in the first mounting hole 12a by threaded engagement, thereby limiting the connecting block 32 and the second bearing 31 and realizing the installation of the differential.

[0029] See appendix Figure 7The inner wall of the limiting ring 33 is provided with a plurality of internal toothed grooves 331, which are used in conjunction with the limiting piece 34 to fix the limiting ring 33. The limiting piece 34 includes an integrally formed fixing part 341, an extension part 342 and a limiting part 343. The fixing part 341 is fixed to the first bracket 11a by bolts. The extension part 342 extends along the first bracket 11a and the outer wall of the limiting ring 33 to the internal toothed grooves 331. The limiting part 343 is engaged in the internal toothed grooves 331 to prevent the limiting ring 33 from rotating, thereby preventing the limiting ring 33 from falling off.

[0030] See appendix Figure 5 The first output gear 6a and the second output gear 6b ​​have the same structure and are arranged in a mirror image. The first output gear 6a includes: a body portion 61 whose inner ring is sleeved on the first half-shaft 4a via a first bearing 64; a meshing portion 62 located on the body portion 61 near the planetary gear 52 and meshing with the planetary gear 52; and a slot portion 63 located on the other side of the body portion 61. The first clutch 7a and the second clutch 7b have the same structure and are distributed in a mirror image along the central axis of the planetary gear 52. The first clutch 7a is located in the mounting space formed by the first output gear 6a and the differential housing 3, and the second clutch 7b is located in the mounting space formed by the second output gear 6b ​​and the differential housing 3.

[0031] See appendix Figure 6 Taking the first clutch 7a as an example, the first clutch 7a includes a piston portion 71, a hydraulic chamber 72, a friction assembly 73, and an elastic element 74. The inner ring of the piston portion 71 is sleeved on the first half-shaft 4a and can move axially along the first half-shaft 4a, while the outer ring of the piston portion 71 is attached to the inner wall of the differential housing 3. The hydraulic chamber 72 is formed in a closed cavity between the piston portion 71, the differential housing 3, and the first half-shaft 4a. The friction assembly 73 is disposed in the closed cavity and includes a first friction plate 73a disposed in the slot portion 63 and rotating synchronously with the first output gear 6a, and a second friction plate 73b disposed on the first half-shaft 4a and rotating synchronously with the first half-shaft 4a. The first friction plate 73a and the second friction plate 73b are arranged alternately. The elastic element 74 is disposed between the first output gear 6a and the piston portion 71 to drive the piston portion 71 to remain away from the friction assembly 73.

[0032] To reduce the overall machine modification cost and improve the commonality of parts and ease of later maintenance, the first half-shaft 4a and the second half-shaft 4b are designed as separate parts. (See attached document) Figures 9 to 11The first half-shaft 4a includes a separate first shaft portion 41a and a first end portion 42a. The first end portion 42a is fitted onto the first shaft portion 41a and connected by a spline. The first end portion 42a is inserted into the differential housing 3 and extends to the slot portion 63 of the first output gear 6a. The first clutch 7a is disposed on the first end portion 42a. The second half-shaft 4b includes a separate second shaft portion 41b and a second end portion 42b. The second end portion 42b is fitted onto the second shaft portion 41b and connected by a spline. The second end portion 42b is inserted into the differential housing 3 and extends to the slot portion 63 of the second output gear 6b. The second clutch 7b is disposed on the second end portion 42b. This means that the first shaft portion 41a and the second shaft portion 41b in this embodiment are the first half-shaft 4a and the second half-shaft 4b of a traditional front drive axle, reducing mold development and parts procurement costs, improving the versatility of product parts, and facilitating later maintenance.

[0033] See appendix Figure 12 Taking the first clutch 7a as an example, the first clutch 7a includes a piston portion 71, a hydraulic chamber 72, a friction assembly 73, and an elastic element 74. The inner ring of the piston portion 71 is fitted onto the first end portion 42a and can move axially along the first end portion 42a. The outer ring of the piston portion 71 is attached to the inner wall of the differential housing 3. The hydraulic chamber 72 is formed in a closed cavity between the piston portion 71, the differential housing 3, and the first end portion 42a. The friction assembly 73 is disposed in the closed cavity. The friction assembly 73 includes a first friction plate 73a disposed in the slot portion 63 and rotating synchronously with the first output gear 6a, and a second friction plate 73b disposed on the first end portion 42a and rotating synchronously with the first end portion 42a. The first friction plate 73a and the second friction plate 73b are arranged alternately. The elastic element 74 is disposed between the first output gear 6a and the piston portion 71 to drive the piston portion 71 to remain away from the friction assembly 73.

[0034] When hydraulic oil is injected into the hydraulic chamber 72, it pushes the piston 71 to move closer to the planetary gear 52. The first friction plate 73a and the second friction plate 73b engage, and the first output gear 6a engages with the first half-shaft 4a to achieve power transmission. When hydraulic oil is output from the hydraulic chamber 72, the elastic element 74 drives the piston 71 to reset and move away from the planetary gear 52. The first friction plate 73a and the second friction plate 73b are in clearance fit, and the first output gear 6a is disconnected from the first half-shaft 4a.

[0035] See appendix Figure 8The outer ring of the connecting block 32 is fixedly installed on the first mounting hole 12a, and the inner ring of the connecting block 32 is rotatably disposed with the end of the differential housing 3. The axle housing 1 is provided with a first flow channel 81, and the outer circumferential surface of the connecting block 32 is provided with a transition flow channel 82, which is connected to the first flow channel 81. The inner circumferential surface of the connecting block 32 is provided with an annular flow channel 84, and the connecting block 32 is provided with a second flow channel 83 connecting the annular flow channel 84 and the transition flow channel 82. The end of the differential housing 3 is provided with a third flow channel 85, which connects the second annular flow channel 84 and the hydraulic chamber 72 to form a complete hydraulic oil supply circuit. The aperture of the transition channel 82 and the width of the annular channel 84 are both larger than the apertures of the first channel 81 and the second channel 83, which facilitates the docking of the first channel 81 and the second channel 83, and the second channel 83 and the third channel 85. The sealing ring 822 is fixed in the circumference of the transition channel 82 by a snap ring 821, and oil seals 841 are provided on both sides of the annular channel 84. The multiple sealing structure effectively prevents hydraulic oil leakage and ensures the accuracy of hydraulic control.

[0036] In existing technology, the differential housing 3 of the front drive axle is positioned with the axle housing 1 only by a locating pin on the mating surface, which is a cantilever support and is prone to deformation under stress, thus affecting the accuracy of the transmission structure. Especially in this embodiment, since the first clutch 7a and the second clutch 7b need to control more precise movements, it is even more necessary to ensure the installation accuracy and stability between the differential and the axle housing 1. In this embodiment, a double bracket plus bearing connection is used to improve the support rigidity.

[0037] See appendix Figure 7 The upper part of the inner wall of the axle housing 1 is fixedly provided with a first positioning platform 13a and a second positioning platform 13b. The first positioning platform 13a has a first step 131a, and the second positioning platform 13b has a second step 131b. A first latch 111a is fixedly provided on the first bracket 11a, abutting against the end face of the first step 131a. The second bracket 11b has a second latch 111b, abutting against the end face of the second step 131b. The lower part of the differential housing 3 is fixedly installed on the axle housing 1 by positioning pins, thereby fixing both ends of the differential. Through the upper and lower double positioning and double bearing symmetrical support structure, the installation rigidity of the differential housing is greatly improved, load deformation is suppressed, and long-term accurate operation of the clutch and gear transmission mechanism is ensured.

[0038] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments described above without departing from the spirit and scope of the invention. Therefore, it is intended that this invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A front drive axle, characterized in that, include: First half-shaft; The second half-shaft is spaced apart from the first half-shaft; An input gear, which is loosely fitted onto the first half-shaft; A differential housing is loosely fitted onto the first and second half-shafts and can rotate around their central axis. The differential housing is connected to the input gear and rotates as a whole. A planetary gear set is disposed within the differential housing. The planetary gear set includes a planetary gear shaft and at least two planetary gears. The two ends of the planetary gear shaft are disposed on the differential housing. The two planetary gears are mounted on the same planetary gear shaft. The planetary gear set as a whole rotates with the differential housing, and the planetary gears can rotate around the planetary gear shaft. The first output gear is loosely fitted on the first half-shaft and meshes with the planetary gear; The second output gear is loosely fitted on the second half-shaft and meshes with the planetary gear; The first clutch is located between the first output gear and the first half-shaft and is used to connect or disconnect the power transmission. The second clutch is located between the second output gear and the second half-shaft to connect or disconnect the power transmission.

2. The front drive axle as described in claim 1, characterized in that, The first output gear and the second output gear have the same structure and are arranged in a mirror image. The first output gear includes: a body part whose inner ring is sleeved on the first half shaft through a first bearing, a meshing part located on the side of the body part near the planetary gear and meshing with the planetary gear, and a slot part located on the other side of the body part.

3. The front drive axle as described in claim 2, characterized in that, The first clutch and the second clutch have the same structure. The first clutch is located in the mounting space formed by the first output gear and the differential housing, and the second clutch is located in the mounting space formed by the second output gear and the differential housing.

4. The front drive axle as described in claim 3, characterized in that, The first clutch includes: The piston part has an inner ring that is fitted onto the first half-shaft and can move axially along the first half-shaft, and an outer ring that fits against the inner wall of the differential housing. A hydraulic chamber, which is a closed cavity formed between the piston portion, the differential housing, and the first half-shaft; The friction assembly includes a first friction plate disposed in the slot and rotating synchronously with the first output gear, and a second friction plate disposed on the first half-shaft and rotating synchronously with the first half-shaft, wherein the first friction plate and the second friction plate are arranged alternately. An elastic element is disposed between the first output gear and the piston portion to drive the piston portion to remain away from the friction assembly.

5. The front drive axle as described in claim 4, characterized in that, The first half-shaft includes a first shaft portion and a first end portion that are separately disposed. The first end portion is sleeved on the first shaft portion and connected by a spline. The first end portion is inserted into the differential housing and extends to the slot portion of the first output gear. The first clutch is disposed on the first end portion. The second half-shaft includes a second shaft portion and a second end portion that are separately disposed. The second end portion is sleeved on the second shaft portion and connected by a spline. The second end portion is inserted into the differential housing and extends to the slot portion of the second output gear. The second clutch is disposed on the second end portion.

6. The front drive axle as described in claim 5, characterized in that, It also includes an axle housing, the two ends of which are connected to the wheel-side reducer housing. Inside the axle housing are a differential housing, a first half-shaft, and a second half-shaft.

7. The front drive axle as described in claim 6, characterized in that, A first bracket and a second bracket are fixedly provided on the lower part of the inner wall of the axle housing. The first bracket and the inner wall of the axle housing form a first mounting hole, and the second bracket and the inner wall of the axle housing form a second mounting hole. The two ends of the differential housing are respectively sleeved on the first half-shaft and the second half-shaft and maintain relative rotation. The two ends of the differential housing are loosely sleeved inside the first mounting hole and the second mounting hole. The differential housing and the first bracket and the second bracket maintain relative rotation.

8. The front drive axle as described in claim 7, characterized in that, A second bearing, a connecting block, a limiting ring, and a limiting plate are sequentially arranged between the end of the differential housing and the first bracket from the differential housing toward the wheel-side reducer side. The inner wall of the limiting ring is provided with a plurality of internal tooth grooves. The limiting plate includes an integrally formed fixing part, an extension part, and a limiting part. The fixing part is fixed to the first bracket by bolts. The extension part extends along the outer wall of the first bracket and the limiting ring to the internal tooth groove. The limiting part is engaged in the internal tooth groove.

9. The front drive axle as described in claim 8, characterized in that, The axle housing is provided with a first flow channel, the outer circumferential surface of the connecting block is provided with a transition flow channel, the transition flow channel is connected to the first flow channel, the inner circumferential surface of the connecting block is provided with an annular flow channel, the connecting block is provided with a second flow channel connecting the annular flow channel and the transition flow channel, and the end of the differential housing is provided with a third flow channel, the third flow channel connecting the second annular flow channel and the hydraulic chamber.

10. A tractor, characterized in that, Includes the front drive axle as described in any one of claims 1 to 9.

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