Differential mechanism and control mechanism thereof

Abstract

The differential mechanism comprises a gear ring, a planet carrier, a first-stage planet wheel, a second-stage planet wheel, a first output shaft and a second output shaft, the gear ring, the first output shaft and the second output shaft are all rotationally installed on a box body, the gear ring is provided with inner teeth and outer teeth, the planet carrier is arranged in the gear ring, and the first-stage planet wheel and the second-stage planet wheel are arranged in the box body. The first-stage planet wheel is rotationally installed on the planet carrier and is in meshing transmission with the inner side of the gear ring, the second-stage planet wheel is rotationally installed on the planet carrier and is in meshing transmission with the second output shaft, and the first output shaft is connected with the planet carrier; the planetary reducer further comprises a sliding sleeve and a shifting fork used for shifting the sliding sleeve, the sliding sleeve can be in spline connection with the planet carrier and the second output shaft, and after the shifting fork shifts the sliding sleeve, the planet carrier, the sliding sleeve and the second output shaft can be connected into a whole. According to the structure, different power outputs can be achieved through the first output shaft and the second output shaft, the larger torque difference is achieved, and the number of components needed by the structure is smaller.

Description

Technical Field

[0001] The utility model relates to the field of differential transmission structures, in particular to a differential and its control mechanism. Background Art

[0002] In the design of the transmission system of construction machinery, differentials are not often used because the left and right power outputs required by construction machinery are in the form of simultaneous output, and there are few situations where differential speed and different torque outputs are required for the left and right outputs. However, with the continuous improvement of the performance requirements for construction machinery, in special cases, a differential is needed and it should be applicable to the working conditions of the same rotational speed and the same torque for the left and right outputs and the working conditions of different rotational speeds and torques for the left and right outputs. In the current design structure, to be applicable to the two working conditions, either the engine needs to be shut down to manually turn on and off the differential, or the structure is complex.

[0003] The prior art with the publication number of CN220930100U discloses a crane transfer case with an anti-oil leakage structure, which includes a body, an input shaft, a first gear, a second gear, a first intermediate shaft, a third gear, a fourth gear, a second intermediate shaft, a fifth gear, a planetary gear, a sun gear and an output shaft. The input shaft, the first intermediate shaft, the second intermediate shaft and the output shaft are sequentially arranged in the body from top to bottom. The first gear and the second gear are sleeved on the input shaft, the third gear and the fourth gear are sleeved on the first intermediate shaft, the fifth gear is sleeved on the second intermediate shaft, and the sun gear is sleeved on the output shaft. The first gear meshes with the third gear, the second gear meshes with the fourth gear, the third gear meshes with the fifth gear, the fifth gear is connected with the planetary gear through an internal gear ring, and the planetary gear meshes with the sun gear to form a cylindrical gear planetary transmission device. The output shaft is also connected with a differential lock, and the differential lock includes a pneumatic fork cover, a pneumatic fork rod, a pneumatic fork plate, a cylinder guide belt and a fork seat. The fork seat is arranged on the output shaft, the pneumatic fork plate is arranged on the fork seat, the pneumatic fork plate is connected with the pneumatic fork cover through the pneumatic fork rod, a compression spring is arranged in the pneumatic fork rod, and a cylinder guide belt and a fourth O-ring are arranged outside the pneumatic fork rod. The front output of the transfer case is output by the sun gear of the differential. In order to ensure the passability of the whole vehicle when the wheels slip, the front axle output assembly of the transfer case is equipped with a differential lock. When the wheels slip, the cylinder is controlled to drive the fork and the gear sleeve to connect the sun gear shaft and the planet carrier into one body to lock the differential.

[0004] In the prior art, the internal gear ring needs to be fixed in the box body, and the planet carrier needs to mesh and drive with other gears, which makes the prior art more complex; and the above planetary gear directly meshes with the output shaft, which makes the torque difference that the prior art can output smaller. Summary of the Utility Model

[0005] In order to solve the problems of complex differential transmission path and small output torque difference in the prior art, the purpose of the utility model is to provide a differential and a control mechanism thereof, wherein the differential requires fewer components, has a simpler transmission path, a simpler differential structure, and a larger torque difference output at both ends of the differential.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a control mechanism of a differential, including a transfer assembly, the transfer assembly including a ring gear, a planetary carrier, a primary planetary gear, a secondary planetary gear, a first output shaft and a second output shaft, the ring gear, the first output shaft and the second output shaft are all rotatably mounted on a housing, the ring gear has internal teeth and external teeth, the planetary carrier is arranged in the ring gear, the primary planetary gear is rotatably mounted on the planetary carrier, the primary planetary gear is meshed with the inner side of the ring gear for transmission, the secondary planetary gear is rotatably mounted on the planetary carrier, the secondary planetary gear is meshed with the second output shaft for transmission, and the first output shaft is splined with the planetary carrier; it also includes a sliding sleeve and a shift fork for shifting the sliding sleeve, the planetary carrier and the second output shaft are both protruding with external teeth, the sliding sleeve can be splined with the planetary carrier and the second output shaft, and the planetary carrier, the sliding sleeve and the second output shaft can be connected into one after the shift fork shifts the sliding sleeve.

[0007] Preferably, the sun gear is detachably fixed to the second output shaft, and the sun gear is meshed with the secondary planetary gear for transmission.

[0008] Preferably, the sun gear is located on the inner side of the planetary carrier, an external spline is provided at one end of the second output shaft, an internal spline is provided on the sun gear, the second output shaft is connected to the sun gear spline, a first retaining ring and a second retaining ring are clamped on the second output shaft, and the first retaining ring and the second retaining ring are respectively arranged on both sides of the sun gear.

[0009] Preferably, a accommodating groove is provided on the planetary carrier, a second bearing is arranged in the accommodating groove, the second output shaft is rotatably connected to the planetary carrier through the second bearing, one end of the second bearing is abutted against the inner wall of the accommodating groove, and the other end of the second bearing is abutted against the third retaining ring clamped in the accommodating groove; an oil sealing ring is also provided between the accommodating groove and the second output shaft, the third retaining ring is located between the oil sealing ring and the second bearing, and a labyrinth sealing gap is formed between the oil sealing ring and the second output shaft.

[0010] Preferably, an annular groove is provided on the sliding sleeve, and one end of the shift fork is protruded with two connecting arms arranged opposite to each other, a stop block is hinged on the connecting arm, and the stop block is slidably arranged in the annular groove.

[0011] Preferably, a driving assembly is further included, one end of the shift fork is connected to the sleeve, the shift fork is hinged to the housing through a locating pin 33, and the other end of the shift fork is connected to the driving assembly. The driving assembly can drive the shift fork to swing, so that the shift fork drives the sleeve to move axially.

[0012] Preferably, the driving assembly includes a guide shaft, a first limit block and a reset member. The guide shaft and the first limit block are both slidably matched with the box body. The reset member is arranged between the guide shaft and the box body. The box body and the first limit block cooperate to form a driving cavity. A through hole connected to the driving cavity is opened on the box body. The end of the fork is arranged between the guide shaft and the first limit block. When the guide shaft and the first limit block move, they can drive the fork to move.

[0013] Preferably, a first positioning groove and a second positioning groove are relatively arranged in the box body, the first limit block is slidably installed in the first positioning groove, the guide shaft is slidably installed in the second positioning groove, the reset member is arranged in the second positioning groove, and the first limit block and the first positioning groove cooperate to form a driving cavity; the second limit block is arranged in the second positioning groove, and the second limit block is used to limit the axial movement of the first limit block.

[0014] Preferably, an end cover is fixed on the box body, and the end cover and the box body cooperate to form a control space, and the sliding sleeve and the shift fork are both arranged in the control space.

[0015] A differential comprises the control mechanism of the differential.

[0016] The beneficial effects of the technical solution of the utility model are as follows: when the loads of the left-end output and the right-end output are different, the above structure can realize different power outputs through the first output shaft and the second output shaft; the above structure has two levels of different planetary gears, so that the first output shaft and the second output shaft can have a larger torque difference; the above structure can realize the same torque output of the first output shaft and the second output at the same circumferential speed by moving the sliding sleeve; the above structure requires fewer components, and the transmission structure in the gearbox or transmission box is also simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of the differential when the left and right outputs are the same;

[0018] Figure 2 This is a schematic diagram of the structure of the differential when the left and right outputs are different;

[0019] Figure 3 for Figure 2 Enlarged view of the middle Z;

[0020] Figure 4 This is the projection diagram of the end cover;

[0021] Figure 5 is a schematic structural diagram of the second output shaft;

[0022] Figure 6 for Figure 5 Enlarged view of Y in the middle;

[0023] Figure 7Schematic diagram of the disassembly process of the planet carrier, sun gear and second output shaft.

[0024] Reference numerals: Ⅰ, drive assembly; Ⅱ, power dividing assembly; 1, first output flange; 2, second output shaft; 3, end cover; 4, sliding sleeve; 5, left housing; 6, second bearing; 7, third retaining ring; 8, oil sealing ring; 9, first retaining ring; 10, first elastic pin; 11, seventh bearing; 12, first-stage planet gear; 13, ring gear; 14, first-stage planet shaft; 15, right housing; 16, planet carrier; 17, first output shaft; 18, second output flange; 19, second retaining ring; 20, sun gear; 21, second-stage planet shaft; 22, eighth bearing; 23, second-stage planet gear; 24, second elastic pin; 25, support plate; 26, through hole; 27, first limit block; 28, sealing ring; 29, second limit block; 30, guide shaft; 31, reset member; 32, fork; 33, positioning pin; 34, stop block; 35, third inner wall; 36, avoidance groove; 37, labyrinth seal gap; 38, accommodation groove; 39, tenth bearing; 40, ninth bearing; 41, external tooth portion; 42, sixth bearing; 43, drive cavity; 44, annular groove; 45, first annular clamping groove. Detailed implementation manners

[0025] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more, unless otherwise clearly defined.

[0028] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature. Embodiment

[0030] As Figures 1 to 6 shown, a differential control structure includes a power transfer component II. The power transfer component II includes a ring gear 13, a planet carrier 16, a first-stage planet gear 12, a second-stage planet gear 23, a first output shaft 17 and a second output shaft 2. The ring gear 13, the first output shaft 17 and the second output shaft 2 are all rotatably installed on the box body. The ring gear 13 has internal teeth and external teeth. The planet carrier 16 is arranged inside the ring gear 13. The first-stage planet gear 12 is rotatably installed on the planet carrier 16 and meshes with the inner side of the ring gear 13 for transmission. The second-stage planet gear 23 is rotatably installed on the planet carrier 16 and meshes with the second output shaft 2 for transmission. The first output shaft 17 is splined to the planet carrier 16; the first-stage planet gear 12 is installed on a first-stage planet shaft 14 through a seventh bearing 11, the second-stage planet gear 23 is installed on a second-stage planet shaft 21 through an eighth bearing 22, both the first-stage planet shaft 14 and the second-stage planet shaft 21 are fixedly connected to the planet carrier 16, the first-stage planet shaft 14 is fixed to the planet carrier through a first elastic pin 10, and the second-stage planet shaft 21 is fixed to the planet carrier through a second elastic pin 24;

[0031] It further includes a sliding sleeve 4 and a fork 32 for toggling the sliding sleeve 4. External tooth portions 41 are respectively protruded on the planet carrier 16 and the second output shaft 2. The sliding sleeve 4 can be splined to the planet carrier 16 and the second output shaft 2. After the fork 32 toggles the sliding sleeve 4, the planet carrier 16, the sliding sleeve 4 and the second output shaft 2 can be connected into one body.

[0032] With such a setting, when the loads on the left-end output and the right-end output are different, the above structure can achieve different power outputs through the first output shaft 17 and the second output shaft 2; the above structure has two levels of different planetary gears, and thus the first output shaft 17 and the second output shaft 2 can have a greater torque difference; the above structure can achieve the same rotational speed and torque output of the first output shaft 17 and the second output shaft through the shifting sleeve 4; the above structure requires fewer components, and the transmission gears in the gearbox or transmission case are also simpler.

[0033] In this embodiment, one end of the planet carrier 16 protrudes with a hollow first connecting portion, and the other end of the planet carrier 16 protrudes with a hollow second connecting portion. External teeth protrude from the outer wall of the second connecting portion, and the second output shaft 2 passes through the second connecting portion and then meshes with the secondary planetary gear 23.

[0034] In this embodiment, as Figure 1 and Figure 2 shown, the sun gear 20 is fixed to the second output shaft 2 in a detachable manner, and the sun gear 20 meshes with the secondary planetary gear 23 for transmission. Specifically, the sun gear 20 is located inside the planet carrier 16. One end of the second output shaft 2 is provided with external splines, and the sun gear 20 is provided with internal splines. The second output shaft 2 is connected to the sun gear 20 by splines. A first retaining ring 9 and a second retaining ring 19 are clamped on the second output shaft 2, and the first retaining ring 9 and the second retaining ring 19 are respectively arranged on both sides of the sun gear 20. With such a setting, the sun gear 20 and the second output shaft 2 are circumferentially fixed by splines, and the gear is axially fixed by the retaining ring, thus facilitating the disassembly and assembly of the gear and the output shaft.

[0035] In this embodiment, as Figures 1 to 6 shown, the inner diameters of the first connecting portion and the second connecting portion are both smaller than the outer diameter of the sun gear 20. To facilitate the disassembly and assembly of the sun gear 20, the second output shaft 2 is provided with a first annular groove 45 and a second annular groove. Both the first annular groove 45 and the second annular groove are provided on the external splines of the second output shaft 2. The second annular groove is provided at the end of the second output shaft 2. The first retaining ring is clamped with the first annular groove 45, and the second retaining ring is clamped with the second annular groove; the first annular groove 45 includes a first inner wall, a second inner wall, and a third inner wall 35 that are connected in sequence. The joints of the first inner wall, the second inner wall, and the third inner wall 35 are transitioned by arcs. The first inner wall is vertically arranged, the second inner wall is axially arranged, and the third inner wall 35 is inclined. The chamfer inclination angle α° of the third inner wall 35 ranges from 0 to 90°. Further, an avoidance groove 36 is opened at the end of the sun gear 20, and the first retaining ring 9 is arranged in the avoidance groove.

[0036] To ensure the stability of the second output shaft 2, in this embodiment, as Figure 3As shown, a receiving groove 38 is formed on the inner wall of the second connecting portion. A second bearing 6 is disposed in the receiving groove 38. The second output shaft 2 is rotatably connected to the planet carrier 16 through the second bearing 6. One end of the second bearing 6 abuts against the inner wall of the receiving groove 38, and the other end of the second bearing 6 abuts against a third retaining ring 7 clamped in the receiving groove 38. An oil seal ring 8 is further disposed between the receiving groove 38 and the second output shaft 2. The third retaining ring 7 is located between the oil seal ring 8 and the second bearing 6. A labyrinth seal gap 37 is formed between the oil seal ring 8 and the second output shaft 2. In this way, when lubricating oil enters the receiving groove 38, the lubricating oil in the receiving groove 38 will not flow away quickly, thus ensuring sufficient lubricating oil for the bearing.

[0037] In this embodiment, as Figure 1 and Figure 2 shown, it further includes a driving assembly I. One end of the fork 32 is connected to the sliding sleeve 4. The fork 32 is hinged to the box body through a positioning pin 33. The other end of the fork 32 is connected to the driving assembly I. The driving assembly I can drive the fork 32 to swing, so that the fork 32 drives the sliding sleeve 4 to axially move.

[0038] Further preferably, as Figure 1 、 Figure 2 and Figure 4 shown, a ring groove 44 is formed on the sliding sleeve 4. One end of the fork 32 protrudes with two oppositely arranged connecting arms. A stop block 34 is hinged on the connecting arm. The stop block 34 is slidably disposed in the ring groove 44.

[0039] In this embodiment, as Figure 1 and Figure 2 shown, the driving assembly I includes a guide shaft 30, a first limit block 27 and a reset member 31. The guide shaft 30 and the first limit block 27 are both slidably engaged with the box body. The reset member 31 is disposed between the guide shaft 30 and the box body. The box body and the first limit block 27 cooperate to form a driving cavity 43. A through hole 26 communicating with the driving cavity 43 is formed on the box body. The end of the fork 32 is disposed between the guide shaft 30 and the first limit block 27. When the guide shaft 30 and the first limit block 27 move, they can drive the fork 32 to move. With such a setting, the end of the fork 32 is a free end, which can not only simplify the device structure but also ensure the structural stability.

[0040] Further preferably, a second limit block 29 for restricting the axial movement of the guide shaft 30 is fixed in the box body. The second limit block 29 restricts the axial movement of the guide shaft 30 to prevent the reset member 31 from being compressed and failing.

[0041] Further preferably, as Figure 1 and Figure 2As shown in the figure, a first positioning groove and a second positioning groove are oppositely arranged inside the box body. The first limiting block 27 is slidably installed in the first positioning groove, the guiding shaft 30 is slidably installed in the second positioning groove, the second limiting block 29 is arranged in the second positioning groove, the resetting member 31 is arranged in the second positioning groove, and the first limiting block 27 and the first positioning groove cooperate to form a driving cavity 43. A sealing ring 28 is arranged between the first positioning groove and the first limiting block 27.

[0042] Further preferably, the resetting member 31 is a spring arranged in the second positioning groove, and the two ends of the spring respectively abut against the guiding shaft 30 and the inner wall of the second positioning groove.

[0043] In this embodiment, an end cover 3 is fixed on the box body. The end cover 3 and the box body cooperate to form a control space, and the sliding sleeve 4 and the fork 32 are both arranged in the control space. The second positioning groove is arranged on the end cover 3, and the first positioning groove is arranged on the outer wall of the box body. Such an arrangement facilitates the disassembly and assembly of the control components.

[0044] In this embodiment, the box body includes a left box body 5 and a right box body 15. The left box body 5 and the right box body 15 are fixedly connected, and the left box body 5 and the right box body 15 cooperate to form a transmission space. The gear ring 13, the planetary gear and the sun gear 20 are all arranged in the transmission space; the end cover 3 is fixed on the left box body 5, and the first positioning groove is arranged on the outer wall of the left box body 5.

[0045] The second connecting portion of the planet carrier 16 is rotationally connected to the left box body 5 through a third bearing, and the first connecting portion of the planet carrier 16 is rotationally connected to the right box body 15 through a fourth bearing; the first output shaft 17 is rotationally connected to the right box body 15 through a fifth bearing, and the second output shaft 2 is rotationally connected to the left box body 5 through a sixth bearing 42; a first output flange 1 is fixed to the end of the first output shaft 17, and a second output flange 18 is fixed to the end of the second output shaft 2.

[0046] In this embodiment, the gear ring 13 protrudes with a third connecting portion. The third connecting portion is rotationally installed on the right box body 15 through a ninth bearing 40, and a supporting plate 25 is fixed to the left end of the gear ring 13. The supporting plate 25 is rotationally installed on the left box body 5 through a tenth bearing 39. The planet carrier, the first-stage planetary gear and the second-stage planetary gear are located between the third connecting portion and the supporting plate.

[0047] When disassembling and assembling the sun gear 20 and the second output shaft 2, remove the second snap ring 19, and then use an external tooling to disassemble the second output shaft 2 to move it to the left. The sun gear 20 follows the second output shaft 2 and moves to the left. When the sun gear 20 moves to contact the planet carrier 16, due to the limitation of the planet carrier 16, the sun gear 20 no longer moves to the left at this time. The second output shaft 2 is disassembled by an external force and continues to move to the left. At this time, the second output shaft 2 is separated from the sun gear 20. The second output shaft 2 and the first snap ring 9 continue to move to the left. When the first snap ring 9 contacts the oil sealing ring 8, due to the limitation of the oil sealing ring 8 by the third snap ring 7, the first snap ring 9 no longer moves to the left. The second output shaft 2 continues to move to the left. The second snap ring 19 slides along the third side wall of the second annular slot, so that the second snap ring 19 moves onto the external spline of the second output shaft 2. Under the action of the disassembly force, the second output shaft 2 continues to move to the left until the sun gear 20 is completely separated from the second output shaft 2.

[0048] When hydraulic oil or hydraulic gas enters the driving cavity 43 through the inlet, it drives the first limiting block 27 to move to the left. The first limiting block 27 pushes the fork 32 to swing. The fork 32 pushes the guide shaft 30 and compresses the spring. The fork 32 drives the sliding sleeve 4 to move to the right, so that the second output shaft 2 is separated from the planet carrier 16; Power enters the ring gear 13. The ring gear 13 rotates and drives the first-stage planet gear 12 to rotate. The first-stage planet gear 12 moves through the teeth on the inner wall of the ring gear 13. The first-stage planet gear 12 drives the planet carrier 16 to rotate through the first-stage planet shaft 14. The planet carrier 16 drives the first output shaft 17 to rotate. The planet carrier 16 drives the second-stage planet shaft 21 to rotate. The second-stage planet shaft 21 drives the sun gear 20 to rotate through the second-stage planet gear 23. The sun gear 20 drives the second output shaft 2 to rotate, so as to realize different power outputs on the left and right.

[0049] When the guide shaft 30 is reset under the spring force of the spring, the spring pushes the guide shaft 30 to move to the right. The guide shaft 30 drives the fork 32 to move. The fork 32 drives the sliding sleeve 4 to move through the stop block 34, so that the output shaft and the planet carrier 16 are fixedly connected through the sliding sleeve 4; Power enters the ring gear 13. The ring gear 13 rotates and drives the first-stage planet gear 12 to rotate. The first-stage planet gear 12 moves through the teeth on the inner wall of the ring gear 13. The first-stage planet gear 12 drives the planet carrier 16 to rotate through the first-stage planet shaft 14. The planet carrier 16 drives the first output shaft 17 to rotate. The planet carrier 16 drives the second output shaft 2 to rotate through the sliding sleeve 4, so as to realize the output of the same rotational speed and torque on the left and right.

[0050] A differential includes a control mechanism of the above differential structure

[0051] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0052] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model without departing from the principles and purposes of the present utility model.

Claims

1. A control mechanism for a differential, characterized in that: The invention comprises a transfer assembly (II), wherein the transfer assembly (II) comprises a ring gear (13), a planet carrier (16), a first-stage planetary gear (12), a second-stage planetary gear (23), a first output shaft (17) and a second output shaft (2); the ring gear (13), the first output shaft (17) and the second output shaft (2) are all rotatably mounted on a housing; the ring gear (13) has internal teeth and external teeth; the planet carrier (16) is arranged in the ring gear (13); the first-stage planetary gear (12) is rotatably mounted on the planet carrier (16); the first-stage planetary gear (12) meshes with the inner side of the ring gear (13) for transmission; the second-stage planetary gear (23) is rotatably mounted on the planet carrier (16); the second-stage planetary gear (23) meshes with the second output shaft (2) for transmission; and the first output shaft (17) is spline-connected to the planet carrier (16); The invention also comprises a sliding sleeve (4) and a shift fork (32) for shifting the sliding sleeve (4); the planet carrier (16) and the second output shaft (2) are both provided with protruding external teeth (41); the sliding sleeve (4) can be spline-connected with the planet carrier (16) and the second output shaft (2); and after the shift fork (32) shifts the sliding sleeve (4), the planet carrier (16), the sliding sleeve (4) and the second output shaft (2) can be connected into one body.

2. The control mechanism of a differential according to claim 1, characterized in that: The sun gear (20) is detachably fixed to the second output shaft (2), and the sun gear (20) is meshed with the secondary planetary gear (23) for transmission.

3. The control mechanism of a differential according to claim 2, characterized in that: The sun gear (20) is located inside the planet carrier (16); one end of the second output shaft (2) is provided with an external spline; the sun gear (20) is provided with an internal spline; the second output shaft (2) is spline-connected to the sun gear (20); a first retaining ring (9) and a second retaining ring (19) are clamped on the second output shaft (2); the first retaining ring (9) and the second retaining ring (19) are respectively arranged on both sides of the sun gear (20).

4. The control mechanism of a differential according to claim 1, characterized in that: The planet carrier is provided with a receiving groove (38), a second bearing (6) is arranged in the receiving groove (38), the second output shaft (2) is rotatably connected to the planet carrier (16) via the second bearing (6), one end of the second bearing (6) abuts against the inner wall of the receiving groove (38), and the other end of the second bearing (6) abuts against a third retaining ring (7) clamped in the receiving groove (38); an oil sealing ring (8) is also arranged between the receiving groove (38) and the second output shaft (2), the third retaining ring (7) is located between the oil sealing ring (8) and the second bearing (6), and a labyrinth sealing gap (37) is formed between the oil sealing ring (8) and the second output shaft (2).

5. The control mechanism of a differential according to claim 1, characterized in that: The sliding sleeve (4) is provided with an annular groove (44). One end of the shift fork (32) is protruded with two connecting arms arranged opposite to each other. A stop block (34) is hingedly connected to the connecting arm. The stop block (34) is slidably arranged in the annular groove (44).

6. The control mechanism of a differential according to claim 1, characterized in that: The invention also comprises a driving assembly (I), one end of the shift fork (32) is connected to the sliding sleeve (4), the shift fork (32) is hinged to the housing via a positioning pin (33), the other end of the shift fork (32) is connected to the driving assembly (I), and the driving assembly (I) can drive the shift fork (32) to swing, so that the shift fork (32) drives the sliding sleeve (4) to move axially.

7. The control mechanism of a differential according to claim 6, characterized in that: The driving component (Ⅰ) includes a guiding shaft (30), a first limiting block (27) and a resetting member (31). The guiding shaft (30) and the first limiting block (27) are both slidably engaged with the box body. The resetting member (31) is arranged between the guiding shaft (30) and the box body. The box body and the first limiting block (27) cooperate to form a driving cavity (43). A through hole communicating with the driving cavity (43) is formed in the box body. The end of the fork (32) is arranged between the guiding shaft (30) and the first limiting block (27). When the guiding shaft (30) and the first limiting block (27) move, they can drive the fork (32) to move.

8. The control mechanism of a differential according to claim 7, characterized in that: A first positioning groove and a second positioning groove are oppositely arranged in the box body. The first limiting block (27) is slidably installed in the first positioning groove. The guiding shaft (30) is slidably installed in the second positioning groove. The resetting member (31) is arranged in the second positioning groove. The first limiting block (27) and the first positioning groove cooperate to form a driving cavity (43); a second limiting block (29) is arranged in the second positioning groove. The second limiting block (29) is used to limit the axial movement of the first limiting block (27).

9. The control mechanism of a differential according to claim 8, characterized in that: An end cover (3) is fixed on the box body. The end cover (3) and the box body cooperate to form a control space. The sliding sleeve (4) and the fork (32) are both arranged in the control space.

10. A differential, characterized in that: It includes a control mechanism for a differential as described in any one of the above claims 1-9.

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