Differential shaft of agricultural machinery

Abstract

The utility model discloses an agricultural machinery differential shaft which comprises a differential shell and a double-section type differential shaft rotationally installed in the differential shell, the differential shell comprises an upper differential shell and a lower differential shell, and the upper end and the lower end of the upper differential shell are welded to each other. The double-section type differential shaft comprises an upper transmission shaft and a lower transmission shaft which are rotationally installed in the upper differential shell and the lower differential shell, a conical end is integrally formed at the bottom end of the upper transmission shaft, and a six-point type butt joint structure used for keeping power connection is installed between the opposite ends of the conical end and the lower transmission shaft. The assembly difficulty is reduced, the assembly efficiency is improved, and as the assembly of the double-section type differential shaft is carried out in steps, parts in the upper differential shell and the lower differential shell can be accurately aligned at each stage, so that the assembly precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of differential shafts, in particular to a differential shaft for agricultural machinery. Background Art

[0002] The differential shaft is a key transmission component in agricultural machinery. It adapts to different road conditions and driving requirements by enabling the left and right wheels to rotate at different speeds, ensuring that the vehicle has good driving stability and handling performance under complex road conditions such as turning, climbing, and off-roading. The structure of the differential shaft mainly includes the shaft body, differential, half shaft, drive axle and other parts. Among them, the differential is the core component, which can enable the left and right wheels to automatically adjust the speed during the turning process to realize the differential function. The shaft body, half shaft and drive axle are responsible for supporting, transmitting power and bearing the weight of the vehicle respectively. In addition, the differential shaft also includes some auxiliary components, such as differential oil seals, half-shaft oil seals, bearings, sealing rings, etc., which play a role of sealing and lubrication to ensure that the differential shaft maintains good performance during long-term operation. However, the differential shaft at this stage is an integrated whole shaft structure. The integrated whole shaft structure is long in length and the connection with the differential case requires precise alignment. Therefore, it is more troublesome to assemble during the process. The differential case needs to be assembled step by step, which takes a lot of time and manpower. In addition, since there are many parts inside the differential case, the shaft and housing are prone to misoperation during the assembly process, resulting in improper assembly. Utility Model Content

[0003] The purpose of the utility model is to provide an agricultural machinery differential shaft, which adopts a two-stage differential shaft, and the upper transmission shaft and the lower transmission shaft in the two-stage differential shaft are respectively inserted into the shell from the upper port and the lower port of the differential case and the docking is completed by using a six-point docking structure to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a differential shaft for agricultural machinery, comprising a differential case and a two-stage differential shaft rotatably mounted inside the differential case, the differential case comprising an upper differential case and a lower differential case whose upper and lower ends are welded to each other, the two-stage differential shaft comprises an upper transmission shaft and a lower transmission shaft rotatably mounted inside the upper differential case and the lower differential case, the bottom end of the upper transmission shaft is integrally formed with a tapered end, and a six-point docking structure for maintaining power connection is installed between the tapered end and the opposite ends of the lower transmission shaft.

[0005] Preferably, an annular cavity is provided at one end inside the lower differential case, and a ball bearing is installed inside the annular cavity, and the inner diameter of the inner ring of the ball bearing is equal to the outer diameter of the lower transmission shaft.

[0006] Preferably, a flange is integrally formed at one end of the surface of the lower differential case, and a circular upper groove extending upward is provided at the bottom end of the flange, an annular lip for fitting into the circular upper groove is installed at one end of the surface of the lower transmission shaft, a lower cam is integrally formed at the bottom end of the annular lip, an upper cam is integrally formed at the top end of the annular lip, and a stepped portion is provided on the outer peripheral surface of the upper cam for fitting into the inner wall of the lower differential case.

[0007] Preferably, the six-point docking structure includes six equally spaced columnar protrusions fixed to the top end of the upper convex shaft and six columnar grooves arranged at the bottom end of the tapered end, and the columnar grooves and the columnar protrusions are concentrically plugged.

[0008] Preferably, a ball-type self-rotation retaining structure is installed at one end inside the upper differential case.

[0009] Preferably, the ball-type self-rotation retaining structure includes an alloy steel retaining frame fixed to one end inside the upper differential case and a plurality of steel balls embedded on the inner wall of the alloy steel retaining frame, and the outer peripheral surface of the tapered end is provided with an arc-shaped inner groove with a curvature equal to that of the steel balls.

[0010] Compared with the prior art, the beneficial effect of the utility model is that the agricultural machinery differential shaft is provided with a two-stage differential shaft and an upper differential case and other structures that cooperate with each other, which reduces the difficulty of assembly and improves the assembly efficiency compared with an integrated whole shaft structure. Moreover, since the assembly of the two-stage differential shaft is carried out in steps, the components inside the upper differential case and the lower differential case can be accurately aligned at each stage, thereby improving the assembly accuracy and helping to ensure that the gap between the differential shaft and the differential case is uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0012] Figure 2 The three-dimensional cross-sectional structure of the utility model is shown in FIG. Figure 1 ;

[0013] Figure 3 The three-dimensional cross-sectional structure of the utility model is shown in FIG. Figure 2 ;

[0014] Figure 4 It is a three-dimensional structural schematic diagram of the utility model;

[0015] Figure 5 It is a schematic diagram of the three-dimensional structure of the double-stage differential shaft of the utility model.

[0016] In the figure: 1. upper differential case; 2. lower differential case; 201. flange; 202. circular upper groove; 3. two-stage differential shaft; 4. upper transmission shaft; 5. lower transmission shaft; 501. annular lip; 502. lower cam; 503. stepped portion; 504. upper cam; 6. annular cavity; 7. ball bearing; 8. six-point docking structure; 9. tapered end; 901. arc-shaped inner groove; 10. ball-type rotation retaining structure. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-5 The utility model provides an embodiment: an agricultural machinery differential shaft, comprising a differential case and a two-stage differential shaft 3 rotatably mounted inside the differential case, the differential case comprising an upper differential case 1 and a lower differential case 2 whose upper and lower ends are welded to each other, the two-stage differential shaft 3 comprises an upper transmission shaft 4 and a lower transmission shaft 5 rotatably mounted inside the upper differential case 1 and the lower differential case 2, the bottom end of the upper transmission shaft 4 is integrally formed with a tapered end 9, and a six-point docking structure 8 for maintaining power connection is installed between the tapered end 9 and the opposite ends of the lower transmission shaft 5, the upper transmission shaft 4 and the lower transmission shaft 5 are docked by the six-point docking structure 8, so that when the upper transmission shaft 4 and the lower transmission shaft 5 bear the weight and torque of the vehicle, the torque can be distributed more evenly, the bending is reduced, and the service life and performance of the differential shaft are improved;

[0019] A flange 201 is integrally formed at one end of the surface of the lower differential case 2, and a circular upper groove 202 extending upward is provided at the bottom end of the flange 201, and an annular lip 501 for fitting with the circular upper groove 202 is installed at one end of the surface of the lower transmission shaft 5, a lower convex shaft 502 is integrally formed at the bottom end of the annular lip 501, and an upper convex shaft 504 is integrally formed at the top end of the annular lip 501, and a stepped portion 503 is provided on the outer peripheral surface of the upper convex shaft 504 for fitting with the inner wall of the lower differential case 2;

[0020] The structural design of the two-stage differential shaft 3 enables the upper transmission shaft 4 and the lower transmission shaft 5 to be disassembled independently. Once a failure or damage occurs, the corresponding transmission shaft can be replaced separately without replacing the entire differential shaft;

[0021] The six-point docking structure 8 includes six equally spaced cylindrical protrusions fixed on the top of the upper convex shaft 504 and six cylindrical grooves arranged at the bottom of the tapered end 9. The cylindrical grooves and the cylindrical protrusions are concentrically plugged, and the six cylindrical protrusions at the top of the lower transmission shaft 5 are docked into the cylindrical grooves at the bottom of the tapered end 9. The upper transmission shaft 4 and the lower transmission shaft 5 are connected through the cylindrical protrusions and the annular grooves, and the upper transmission shaft 4 and the lower transmission shaft 5 inside the differential case are ensured to be kept in precise relative positions;

[0022] An annular cavity 6 is provided at one end of the lower differential case 2, and a ball bearing 7 is installed inside the annular cavity 6. The inner diameter of the inner ring of the ball bearing 7 is equal to the outer diameter of the lower transmission shaft 5. After the lower transmission shaft 5 is installed inside the lower differential case 2, the annular lip 501 is matched with the lower convex shaft 502, and the inner wall of the lower differential case 2 and the outer wall of the lower transmission shaft 5 are connected through the step portion 503. In this process, the ball bearing 7 has a high rolling fatigue life and can maintain stable working performance in harsh working environments, thereby reducing the rotational wear of the lower transmission shaft 5 inside the lower differential case 2 and extending the service life of the components;

[0023] A ball-type self-rotation retaining structure 10 is installed at one end of the upper differential case 1. The ball-type self-rotation retaining structure 10 includes an alloy steel retaining frame fixed to one end of the upper differential case 1 and a plurality of steel balls embedded on the inner wall of the alloy steel retaining frame. The outer peripheral surface of the tapered end 9 is provided with an arc-shaped inner groove 901 having the same curvature as the steel ball.

[0024] After the upper transmission shaft 4 is assembled to the interior of the upper differential case 1, the arc-shaped inner groove 901 on the outer wall of the tapered end 9 is engaged with the steel balls in the ball-type self-rotation retaining structure 10. The steel balls have small friction resistance and can rotate inside the alloy steel retaining frame, thereby effectively reducing the energy loss during the shaft transmission process and improving the transmission efficiency.

[0025] When the embodiment of the present application is in use, first, the two-stage differential shaft 3 is divided into an upper transmission shaft 4 and a lower transmission shaft 5. Therefore, in the process of assembling the differential case and the two-stage differential shaft 3, the upper transmission shaft 4 is inserted from the upper end of the upper differential case 1 into the interior of the upper differential case 1 until the mounting is stable. At this time, the ball-type self-rotation retaining structure 10 surrounds the outer side of the tapered end 9, and the lower transmission shaft 5 is inserted from the lower end of the lower differential case 2 into the interior of the upper differential case 1 until the collision is stable. At this time, the top end of the lower transmission shaft 5 and the bottom end of the tapered end 9 are connected by a six-point docking structure 8 and are in a state of dynamic engagement. Compared with the one-piece whole shaft structure, this assembly method of the housing and the shaft body reduces the assembly difficulty and improves the assembly efficiency. Moreover, since the assembly of the two-stage differential shaft 3 is carried out in steps, the components inside the upper differential case 1 and the lower differential case 2 can be accurately aligned at each stage, thereby improving the assembly accuracy and helping to ensure that the gap between the differential shaft and the differential case is uniform.

Claims

1. A differential shaft for agricultural machinery, characterized in that: The invention comprises a differential case and a two-stage differential shaft (3) rotatably mounted inside the differential case, wherein the differential case comprises an upper differential case (1) and a lower differential case (2) whose upper and lower ends are welded to each other, and the two-stage differential shaft (3) comprises an upper transmission shaft (4) and a lower transmission shaft (5) rotatably mounted inside the upper differential case (1) and the lower differential case (2), wherein the bottom end of the upper transmission shaft (4) is integrally formed with a tapered end (9), and a six-point docking structure (8) for maintaining power connection is installed between the tapered end (9) and the opposite ends of the lower transmission shaft (5).

2. The agricultural machinery differential shaft according to claim 1, characterized in that: An annular cavity (6) is provided at one end of the interior of the lower differential housing (2), and a ball bearing (7) is installed inside the annular cavity (6), wherein the inner diameter of the inner ring of the ball bearing (7) is equal to the outer diameter of the lower transmission shaft (5).

3. The agricultural machinery differential shaft according to claim 1, characterized in that: A flange (201) is integrally formed at one end of the surface of the lower differential case (2), and a circular upper groove (202) extending upward is provided at the bottom end of the flange (201); an annular lip (501) for fitting into the circular upper groove (202) is installed at one end of the surface of the lower transmission shaft (5); a lower cam (502) is integrally formed at the bottom end of the annular lip (501), and an upper cam (504) is integrally formed at the top end of the annular lip (501); and a stepped portion (503) is provided on the outer peripheral surface of the upper cam (504) for fitting into the inner wall of the lower differential case (2).

4. The agricultural machinery differential shaft according to claim 3, characterized in that: The six-point docking structure (8) comprises six equally spaced columnar protrusions fixed to the top of the upper convex shaft (504) and six columnar grooves arranged at the bottom of the conical end (9), and the columnar grooves and the columnar protrusions are concentrically plugged.

5. The agricultural machinery differential shaft according to claim 1, characterized in that: A ball-type self-rotation retaining structure (10) is installed at one end inside the upper differential case (1).

6. The agricultural machinery differential shaft according to claim 5, characterized in that: The ball-type self-rotation retaining structure (10) comprises an alloy steel retaining frame fixed to one end inside the upper differential case (1) and a plurality of steel balls embedded on the inner wall of the alloy steel retaining frame, and the outer peripheral surface of the tapered end (9) is provided with an arc-shaped inner groove (901) having a curvature equal to that of the steel balls.

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