Differential mechanism, transmission, power assembly and vehicle

Abstract

The invention discloses a differential mechanism, a transmission, a power assembly and a vehicle. The differential mechanism comprises a main reduction gear, a shell, a planetary gear, a planetary shaft and a limiting and lubricating device. The shell and the main reduction gear are connected and rotate synchronously, and a plurality of mounting holes formed in the circumferential direction of the shell at intervals are formed in the circumferential wall of the shell; the multiple planetary gears are arranged in the circumferential direction of the main reduction gear at intervals, and the planetary gears are arranged in the shell. The multiple planet shafts correspond to the multiple planet gears, and the multiple planet shafts are arranged in the multiple mounting holes in a penetrating mode correspondingly. The limiting and lubricating device is arranged outside the shell in a sleeving mode and is opposite to the planet shaft. According to the differential mechanism, axial movement of the planet shafts can be avoided, the structural stability and the operation reliability are high, and the service life is long.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a differential, a transmission, a powertrain and a vehicle. Background Art

[0002] In the related art, vehicles are usually equipped with differentials to ensure driving stability when turning or driving on rough roads. However, in existing differentials, multiple planetary shafts are prone to axial movement due to centrifugal force when rotating, which affects the stability and reliability of the differential operation. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a differential, which can prevent the planetary shaft from axial movement, has high structural stability and operational reliability, and has a long service life.

[0004] The present invention also provides a transmission, which includes the above-mentioned differential.

[0005] The present invention also provides a power assembly, which includes the above-mentioned transmission.

[0006] The present invention also provides a vehicle, comprising the above-mentioned power assembly.

[0007] The differential according to an embodiment of the present invention comprises: a main reduction gear, a housing, planetary gears, planetary shafts, and a limit and lubrication device. The housing is connected to the main reduction gear and rotates synchronously, and the peripheral wall of the housing has a plurality of mounting holes arranged at intervals along the circumferential direction of the housing; the planetary gears are arranged at intervals along the circumferential direction of the main reduction gear, and the planetary gears are arranged in the housing; the planetary shafts are a plurality of corresponding to the plurality of planetary gears, and the plurality of planetary shafts are respectively inserted into the plurality of mounting holes; the limit and lubrication device is sleeved outside the housing and arranged opposite to the planetary shafts.

[0008] According to the differential of the embodiment of the present invention, by providing a plurality of mounting holes spaced along the circumferential direction of the housing connected to the main reduction gear and rotating synchronously, and allowing a plurality of planetary shafts to be respectively inserted into the plurality of mounting holes, the driving wheels at both ends can be controlled to rotate at the same or different angular velocities to adapt to the driving requirements of the vehicle under different road conditions, thereby improving the driving stability and maneuverability of the vehicle. At the same time, by arranging the limiting and lubricating device outside the housing and relative to the planetary shaft, the positioning and limiting functions can be achieved, and the axial movement of the planetary shaft can be avoided, thereby improving the structural stability of the differential, and improving the stability and reliability of the operation of the differential. It can also reduce the friction and wear between the planetary shaft and other components, thereby helping to extend the service life of the differential.

[0009] According to some embodiments of the present invention, the outer wall of the shell has an annular groove extending in the circumferential direction of the shell, the mounting hole is arranged in the annular groove, and the limiting and lubricating device is provided with a plurality of oil holes, and the plurality of oil holes are spaced apart in the circumferential direction of the limiting and lubricating device.

[0010] In some embodiments of the present invention, a groove extending along the circumferential direction of the limiting and lubricating device is provided on the inner circumferential wall of the limiting and lubricating device, and the oil hole passes through the bottom wall of the groove.

[0011] In some embodiments of the present invention, a baffle is provided on the outer peripheral wall of the position limiting and lubricating device, and the baffle is one or a plurality of baffles spaced apart along the circumferential direction of the position limiting and lubricating device.

[0012] In some embodiments of the present invention, the baffle is recessed in a direction opposite to the rotation direction of the limiting and lubricating device to form a recessed portion.

[0013] In some embodiments of the present invention, in the axial direction of the limiting and lubricating device, the baffle includes a first section and a second section connected in sequence, and the first section and the second section form a V shape.

[0014] In some embodiments of the present invention, there are multiple baffles, and the multiple baffles correspond one-to-one to the multiple oil holes, and the oil holes are arranged at the bottom end of the recessed portion.

[0015] In some embodiments of the present invention, the number of the baffles is less than or equal to 500; and / or the height of the baffles is 1 mm-20 mm.

[0016] In some embodiments of the present invention, the limiting and lubricating device is a rubber part, a plastic part or a metal part.

[0017] In some embodiments of the present invention, an axial hole extending along the axial direction of the planetary shaft is provided on the end face of the planetary shaft close to the radial outer end of the shell, and a radial hole connected to the axial hole is also provided on the outer peripheral wall of the planetary shaft, and the radial hole extends along the radial direction of the planetary shaft.

[0018] In some embodiments of the present invention, there are a plurality of radial holes, and the plurality of radial holes are spaced apart along the axial direction of the planetary shaft and / or spaced apart along the circumferential direction of the planetary shaft.

[0019] According to some embodiments of the present invention, the plurality of planetary shafts include a first planetary shaft, a second planetary shaft, a third planetary shaft and a fourth planetary shaft, wherein the axes of the first planetary shaft and the third planetary shaft coincide, and the axes of the second planetary shaft and the fourth planetary shaft coincide and are perpendicular to the axis of the first planetary shaft.

[0020] In some embodiments of the present invention, the first planetary shaft and the third planetary shaft are connected as an integral part, and a tube through-hole extending in a radial direction of the first planetary shaft and penetrating therethrough is provided at the connection between the first planetary shaft and the third planetary shaft, and a protrusion is provided at one end of the second planetary shaft and the fourth planetary shaft close to the radial inner side of the shell, and the two protrusions extend into the tube through-hole from both sides respectively.

[0021] According to some embodiments of the present invention, a bushing is provided between the planetary shaft and the mounting hole.

[0022] According to some embodiments of the present invention, a gasket is provided between the planetary gear and the housing, and the gasket is sleeved on the planetary shaft.

[0023] According to some embodiments of the present invention, the housing includes: a rear differential housing and a front differential housing, the rear differential housing is connected to the main reduction gear; the front differential housing is connected to the rear differential housing, the planetary gear is arranged in the front differential housing, the mounting hole is arranged on the front differential housing, and the limiting and lubrication device is sleeved on the outside of the front differential housing.

[0024] A transmission according to an embodiment of the present invention comprises: a case and the above-mentioned differential, wherein the differential is arranged in the case.

[0025] According to the transmission of the embodiment of the present invention, by setting a plurality of mounting holes spaced along the circumferential direction of the housing on the peripheral wall of the housing connected to the main reduction gear and rotating synchronously, and allowing a plurality of planetary shafts to be respectively inserted into the plurality of mounting holes, the driving wheels at both ends can be controlled to rotate at the same or different angular velocities to adapt to the driving needs of the vehicle under different road conditions, thereby improving the driving stability and maneuverability of the vehicle. At the same time, by setting the limiting and lubricating device outside the housing and relative to the planetary shaft, it can play a role in positioning and limiting, avoiding axial movement of the planetary shaft, improving the structural stability of the differential, and improving the stability and reliability of the operation of the differential. It can also reduce the friction and wear between the planetary shaft and other components, thereby helping to extend the service life of the differential, and further improving the stability, reliability and service life of the transmission.

[0026] In some embodiments of the present invention, there is oil at the bottom of the box, and the lower end of the limiting and lubricating device is located below the oil level.

[0027] A powertrain according to an embodiment of the present invention includes: the above-mentioned transmission.

[0028] According to the powertrain of the embodiment of the present invention, by setting a plurality of mounting holes spaced along the circumferential direction of the shell on the peripheral wall of the shell connected to the main reduction gear and rotating synchronously, and allowing a plurality of planetary shafts to be respectively inserted into the plurality of mounting holes, the driving wheels at both ends can be controlled to rotate at the same or different angular velocities to adapt to the driving needs of the vehicle under different road conditions, thereby improving the driving stability and maneuverability of the vehicle. At the same time, by setting the limiting and lubricating device outside the shell and relative to the planetary shaft, it can play a role in positioning and limiting, avoiding axial movement of the planetary shaft, improving the structural stability of the differential, and improving the stability and reliability of the operation of the differential. It can also reduce the friction and wear between the planetary shaft and other components, thereby helping to extend the service life of the differential, thereby improving the stability, reliability and service life of the transmission, and further improving the stability, reliability and service life of the powertrain.

[0029] A vehicle according to an embodiment of the present invention includes: the above-mentioned power assembly.

[0030] According to the vehicle of the embodiment of the present invention, by setting a plurality of mounting holes spaced along the circumferential direction of the shell on the circumferential wall of the shell connected to the main reduction gear and rotating synchronously, and allowing a plurality of planetary shafts to be respectively inserted into the plurality of mounting holes, the driving wheels at both ends can be controlled to rotate at the same or different angular velocities to adapt to the driving needs of the vehicle under different road conditions, thereby improving the driving stability and maneuverability of the vehicle. At the same time, by setting the limiting and lubricating device outside the shell and relative to the planetary shaft, it can play a role in positioning and limiting, avoiding axial movement of the planetary shaft, improving the structural stability of the transmission, and improving the stability and reliability of the transmission operation. It can also reduce the friction and wear between the planetary shaft and other components, thereby helping to extend the service life of the transmission, thereby improving the stability, reliability and service life of the powertrain, and further improving the driving stability and maneuverability of the vehicle.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0033] Figure 1 is an exploded view of a differential according to an embodiment of the present invention;

[0034] Figure 2is a side view of a differential according to an embodiment of the present invention;

[0035] Figure 3 is a side view of a front differential case of a housing of a differential according to an embodiment of the present invention;

[0036] Figure 4 is a three-dimensional diagram of a differential limiting and lubricating device according to an embodiment of the present invention;

[0037] Figure 5 is a front view of a first planetary shaft and a third planetary shaft of a differential according to an embodiment of the present invention;

[0038] Figure 6 is a cross-sectional view of a first planetary shaft and a third planetary shaft of a differential according to an embodiment of the present invention;

[0039] Figure 7 is a cross-sectional view of a second planetary shaft of a differential according to an embodiment of the present invention;

[0040] Figure 8 is a side view of a transmission according to an embodiment of the present invention;

[0041] Fig. 9 is along Figure 8 Sectional view along line AA;

[0042] Fig.10 is along Figure 8 Partial section view along line AA showing only the differential and fluid.

[0043] Reference numerals:

[0044] 100. Differential;

[0045] 1. Main reduction gear;

[0046] 2. housing; 21. front differential housing; 211. mounting hole; 212. annular groove; 22. rear differential housing;

[0047] 3. Planetary gear;

[0048] 4. Planetary shaft; 41. First planetary shaft; 42. Second planetary shaft; 421. Extension; 43. Third planetary shaft; 44. Fourth planetary shaft; 45. Axial hole; 46. Radial hole; 47. Pipe through hole;

[0049] 5. Limiting and lubricating device; 51. Oil hole; 52. Groove; 53. Baffle; 531. Concave portion; 532. First section; 533. Second section;

[0050] 61. Bushing; 62. Gasket; 63. Output shaft;

[0051] 7. Axle gear; 71. First axle gear; 72. Second axle gear;

[0052] 200, transmission;

[0053] 8. Box body;

[0054] 9. Oil. DETAILED DESCRIPTION

[0055] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying 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 therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0057] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] Reference below Figure 1-Figure 10 A differential 100 according to an embodiment of the present invention will be described.

[0059] like Figure 1 and Figure 2 As shown, the differential 100 according to the embodiment of the present invention includes a main reduction gear 1, a housing 2, planetary gears 3, planetary shafts 4 and a limiting and lubricating device 5.

[0060] Specifically, Figure 1 and Figure 2 As shown, combined Figure 3 and Figure 4 The housing 2 is connected to the main reduction gear 1 and rotates synchronously. The peripheral wall of the housing 2 has a plurality of mounting holes 211 arranged at intervals along the circumferential direction of the housing 2. The planetary gears 3 are arranged at intervals along the circumferential direction of the main reduction gear 1, and the planetary gears 3 are arranged in the housing 2. The planetary shafts 4 are a plurality of planetary shafts 4 corresponding to the plurality of planetary gears 3, and the plurality of planetary shafts 4 are respectively penetrated in the plurality of mounting holes 211. The limit and lubrication device 5 is sleeved outside the housing 2 and arranged opposite to the planetary shafts 4.

[0061] The differential 100 is provided with an output shaft 63 at both axial ends, and the end of the output shaft 63 away from the housing 2 is suitable for connecting to the driving wheel of the vehicle. The differential 100 also includes a plurality of side gears 7, which are arranged in the housing 2, and the end of the output shaft 63 away from the driving wheel is connected to the side gear 7. The plurality of side gears 7 are specifically a first side gear 71 and a second side gear 72. In the axial direction of the differential 100, the first side gear 71 and the second side gear 72 are respectively located on both sides of the planetary gear 3, and the first side gear 71 and the second side gear 72 are meshed with the plurality of planetary gears 3, and the rotation axes of the main reduction gear 1, the housing 2, the output shaft 63 and the side gear 7 coincide.

[0062] Among them, multiple planetary shafts 4 are respectively inserted into the corresponding planetary gears 3 and multiple mounting holes 211, so that the differential 100 can operate normally and control the driving wheels at both ends to rotate at the same or different angular velocities to adapt to the driving needs of the vehicle under different road conditions, thereby improving the driving stability and controllability of the vehicle.

[0063] When the vehicle is traveling in a straight line, the main reducer rotates synchronously with the housing 2, so that the inner wall of the mounting hole 211 generates thrust on the planetary shaft 4, thereby driving the multiple planetary shafts 4 to rotate around the rotation axis of the housing 2. Driven by the planetary shaft 4, the multiple planetary gears 3 also rotate around the rotation axis of the housing 2. At this time, the first half-shaft gear 71 and the second half-shaft gear 72 rotate at the same speed and in the same direction under the clamping of the multiple planetary gears 3, so that the rotation speeds of the drive wheels on both sides of the vehicle are equal.

[0064] When the vehicle turns, since the inner drive wheel has a shorter travel distance than the outer drive wheel, the inner and outer drive wheels need to rotate at different speeds. At this time, the main reducer rotates synchronously with the housing 2. While the housing 2 drives the multiple planetary shafts 4 and the multiple planetary gears 3 to rotate around the rotation axis of the housing 2 through the mounting holes 211, the multiple planetary gears 3 also rotate around their own axes, causing the speed of one of the first half-shaft gear 71 and the second half-shaft gear 72 to increase and the speed of the other to decrease, thereby achieving the drive wheels on both sides of the vehicle rotating at different speeds, which can ensure the stability of the vehicle's driving.

[0065] Furthermore, the position limiting and lubricating device 5 is sleeved outside the housing 2 and arranged opposite to the planetary shaft 4. The position limiting and lubricating device 5 can be specifically annular, with a simple structure, low cost and easy installation. The end face of the planetary shaft 4 that is away from the rotation axis of the housing 2 can abut against the inner circumferential wall of the position limiting and lubricating device 5. When the multiple planetary shafts 4 rotate around the rotation axis of the housing 2 driven by the housing 2, the position limiting and lubricating device 5 can play a role in positioning and limiting, avoiding the axial movement of the multiple planetary shafts 4 due to centrifugal force, which can improve the structural stability of the differential 100, and improve the stability and reliability of the operation of the differential 100. It can also reduce the friction and wear between the planetary shaft 4 and other components, thereby helping to extend the service life of the differential 100.

[0066] In the prior art, the differential usually uses a planetary pin to fix the planetary shaft to the housing, but the planetary pin is prone to fracture and failure due to high stress. The limit and lubrication device 5 used in the present application can effectively reduce the stress, have stronger structural stability, and can effectively reduce the risk of fracture and failure, thereby solving the problem of unstable positioning of the planetary shaft 4.

[0067] According to the differential 100 of the embodiment of the present invention, by providing a plurality of mounting holes 211 spaced along the circumferential direction of the housing 2 on the peripheral wall of the housing 2 connected to the main reduction gear 1 and rotating synchronously, and allowing a plurality of planetary shafts 4 to be respectively inserted into the plurality of mounting holes 211, the driving wheels at both ends can be controlled to rotate at the same or different angular velocities to adapt to the driving requirements of the vehicle under different road conditions, thereby improving the driving stability and controllability of the vehicle. At the same time, by sleeve-arranging the limit and lubrication device 5 outside the housing 2 and relative to the planetary shaft 4, the positioning and limit functions can be played to avoid the axial movement of the planetary shaft 4, thereby improving the structural stability of the differential 100, and improving the stability and reliability of the operation of the differential 100. It can also reduce the friction and wear between the planetary shaft 4 and other components, thereby helping to extend the service life of the differential 100.

[0068] In some embodiments of the present invention, Figure 1-Figure 4 As shown, the outer peripheral wall of the housing 2 is provided with an annular groove 212 extending in the circumferential direction of the housing 2, the mounting hole 211 is arranged in the annular groove 212, and the position limiting and lubricating device 5 is provided with a plurality of oil holes 51, and the plurality of oil holes 51 are arranged at intervals in the circumferential direction of the position limiting and lubricating device 5. The annular groove 212 can play a positioning and limiting role for the position limiting and lubricating device 5, so that the position limiting and lubricating device 5 is stably sleeved on the outer peripheral wall of the housing 2 and opposite to the mounting hole 211.

[0069] like Fig. 9 and Fig.10In the example shown, during the specific operation of the differential 100, the bottom of the differential 100 has oil 9, and the lower end of the limit and lubricating device 5 is located below the surface of the oil 9. When the housing 2 rotates, the limit and lubricating device 5 rotates accordingly, and the oil 9 can enter between the housing 2 and the limit and lubricating device 5 through a plurality of oil holes 51, so that it can penetrate between the inner wall of the mounting hole 211 and the peripheral wall of the planetary shaft 4, and then penetrate between the matching surfaces of the planetary shaft 4 and the planetary gear 3 to play a lubricating role. The structure is simple, easy to implement and low in cost.

[0070] The oil 9 can also take away a large amount of heat generated by friction between the planetary shaft 4 and the planetary gear 3, thereby preventing the differential 100 from being sintered internally and causing loss of differential function, thereby improving the operating performance, safety and stability of the differential 100 and extending the service life of the differential 100.

[0071] In some embodiments of the present invention, Figure 1-Figure 4 As shown, the inner peripheral wall of the position limiting and lubricating device 5 is provided with a groove 52 extending in the circumferential direction of the position limiting and lubricating device 5, and the oil hole 51 penetrates the bottom wall of the groove 52. Thus, an annular cavity can be formed between the inner peripheral wall of the position limiting and lubricating device 5 and the outer peripheral wall of the housing 2, which can play a certain role in storing the oil 9 to ensure the stability of the lubrication effect. The oil 9 can enter the groove 52 from the multiple oil holes 51 and flow in the annular groove 52, so that the uniformity of the oil 9 entering each mounting hole 211 can be enhanced, so that the lubrication effect in each mounting hole 211 can be enhanced, and then the operating performance, safety and stability of the differential 100 can be improved, and the service life of the differential 100 can be extended.

[0072] In some embodiments of the present invention, Figure 1-Figure 4 As shown, a baffle 53 is provided on the outer peripheral wall of the position limiting and lubricating device 5 , and the baffle 53 is one or a plurality of baffles 53 spaced apart along the circumferential direction of the position limiting and lubricating device 5 .

[0073] It is understandable that if Fig. 9 and Fig.10 In the example shown, during the specific operation of the differential 100, the bottom of the differential 100 has oil 9, and the lower end of the limit and lubrication device 5 is located below the surface of the oil 9. When the housing 2 rotates, the limit and lubrication device 5 rotates accordingly, and the baffle 53 can lift the oil 9, which helps the oil 9 to enter between the housing 2 and the limit and lubrication device 5 through the multiple oil holes 51, thereby increasing the amount of oil 9 entering the differential 100, and further improving the lubrication effect between the inner wall of the mounting hole 211 and the peripheral wall of the planetary shaft 4, and between the planetary shaft 4 and the planetary gear 3. The surface of the mating surface, thereby improving the operation performance, safety and stability of the differential 100, and extending the service life of the differential 100.

[0074] In some embodiments of the present invention, Figure 1-Figure 4 As shown, the baffle 53 is recessed in a direction opposite to the rotation direction of the position limiting and lubricating device 5 to form a recessed portion 531. When the position limiting and lubricating device 5 rotates, the recessed portion 531 can carry a portion of the oil 9, so that the baffle 53 can lift more oil 9, thereby allowing more oil 9 to enter between the housing 2 and the position limiting and lubricating device 5 through the multiple oil holes 51, further increasing the amount of oil 9 entering the differential 100, thereby better improving the lubrication and cooling effects in the differential 100, thereby improving the operating performance, safety and stability of the differential 100, and extending the service life of the differential 100.

[0075] In some embodiments of the present invention, Figure 1-Figure 4 As shown, in the axial direction of the position limiting and lubricating device 5, the baffle 53 includes a first section 532 and a second section 533 connected in sequence, and the first section 532 and the second section 533 are formed into a V shape. The structure is simple and easy to produce and process, and it is convenient to realize the recessed portion 531. When the position limiting and lubricating device 5 rotates, the connection between the first section 532 and the second section 533 can carry a part of the oil 9, so that the baffle 53 can lift more oil 9, so that more oil 9 can enter between the housing 2 and the position limiting and lubricating device 5 through multiple oil holes 51, further increasing the amount of oil 9 entering the differential 100, thereby better improving the lubrication and cooling effect in the differential 100, and then can improve the operation performance, safety and stability of the differential 100, and extend the service life of the differential 100.

[0076] Of course, in other embodiments of the present invention, the baffle 53 may also be in an arc shape or other shapes, as long as the baffle 53 is recessed in a direction opposite to the rotation direction of the limiting and lubricating device 5 and a recessed portion 531 is formed.

[0077] In some embodiments of the present invention, Figure 1-Figure 4 As shown, there are multiple baffles 53, and the multiple baffles 53 correspond to the multiple oil holes 51 one by one, and the oil holes 51 are arranged at the bottom end of the recessed portion 531. Therefore, the oil holes 51 can form a better match with the baffles 53. When the limit and lubrication device 5 rotates, the recessed portion 531 can carry a part of the oil 9 and guide the oil 9 into the oil hole 51 arranged at the bottom end of the recessed portion 531, which helps more oil 9 to enter between the housing 2 and the limit and lubrication device 5 through the multiple oil holes 51, further increasing the amount of oil 9 entering the differential 100, thereby better improving the lubrication and cooling effect in the differential 100, and further improving the operating performance, safety and stability of the differential 100, and extending the service life of the differential 100.

[0078] In some embodiments of the present invention, the number of baffles 53 is less than or equal to 500. If the number of baffles 53 is too large, the spacing between the baffles 53 in the axial direction of the position limiting and lubricating device 5 will be too small, which will cause the effect of each baffle 53 lifting the oil 9 and guiding the oil 9 into the oil hole 51 to deteriorate, while increasing the material and cost of producing the position limiting and lubricating device 5. Therefore, the number of baffles 53 is less than or equal to 500, which can effectively control the production cost while ensuring the effect of the baffle 53 lifting the oil 9 and guiding the oil 9 into the oil hole 51.

[0079] In some embodiments of the present invention, the height of the baffle 53 is 1 mm-20 mm. If the height of the baffle 53 is too low, the effect of the baffle 53 lifting the oil 9 and guiding the oil 9 into the oil hole 51 will be reduced. If the height of the baffle 53 is too high, the space occupied by the baffle 53 will be increased, and the materials for producing the position limiting and lubricating device 5 will be increased and the cost will be increased. Therefore, the height of the baffle 53 is within a suitable range of 1 mm-20 mm, while ensuring the effect of the baffle 53 lifting the oil 9 and guiding the oil 9 into the oil hole 51, the production cost can be effectively controlled and the space occupied by the position limiting and lubricating device 5 can be moderate.

[0080] In some embodiments of the present invention, the limit and lubrication device 5 is a rubber part, a plastic part or a metal part, which can ensure the structural strength and structural stability of the limit and lubrication device 5. The rubber part and the plastic part also have good corrosion resistance, which can ensure the structural stability and service life of the differential 100.

[0081] In some embodiments of the present invention, Figure 1 , Figure 5-Figure 7 and Fig.10 As shown, the end face of the planetary shaft 4 close to the radial outer end of the housing 2 is provided with an axial hole 45 extending in the axial direction of the planetary shaft 4, and the outer peripheral wall of the planetary shaft 4 is also provided with a radial hole 46 connected to the axial hole 45, and the radial hole 46 extends in the radial direction of the planetary shaft 4.

[0082] It can be understood that when the housing 2 and the limiting and lubricating device 5 rotate together, the oil 9 entering between the housing 2 and the limiting and lubricating device 5 from the multiple oil holes 51 can enter the axial hole 45, and then penetrate into the outer peripheral wall of the planetary shaft 4 from the radial hole 46, thereby effectively improving the lubrication effect between the inner wall of the mounting hole 211 and the peripheral wall of the planetary shaft 4, and between the mating surfaces of the planetary shaft 4 and the planetary gear 3. The structure is simple and the layout is reasonable, which can better avoid the problem of sintering failure, thereby improving the operating performance, safety and stability of the differential 100, and extending the service life of the differential 100.

[0083] In some embodiments of the present invention, Figure 1 , Figure 5-Figure 7 and Fig.10 As shown, there are multiple radial holes 46, and the multiple radial holes 46 are arranged at intervals along the axial direction of the planet shaft 4 and / or along the circumferential direction of the planet shaft 4. The multiple radial holes 46 can ensure that the oil 9 in the axial hole 45 can flow to the outer peripheral wall of the planet shaft 4 more evenly, so as to further improve the lubrication effect between the inner wall of the mounting hole 211 and the peripheral wall of the planet shaft 4, and between the mating surfaces of the planet shaft 4 and the planetary gear 3. The structure is simple and the arrangement is reasonable, which can better avoid the problem of sintering failure, thereby improving the operating performance, safety and stability of the differential 100, and extending the service life of the differential 100.

[0084] In some embodiments of the present invention, Figure 1 , Fig. 9 and Fig.10 As shown, the multiple planetary shafts 4 include a first planetary shaft 41, a second planetary shaft 42, a third planetary shaft 43 and a fourth planetary shaft 44. The axes of the first planetary shaft 41 and the third planetary shaft 43 coincide, and the axes of the second planetary shaft 42 and the fourth planetary shaft 44 coincide and are perpendicular to the axis of the first planetary shaft 41. Thus, the first planetary shaft 41, the second planetary shaft 42, the third planetary shaft 43 and the fourth planetary shaft 44 can form a cross structure, which can ensure the structural stability between the planetary shafts 4, and can also make the planetary gears 3 corresponding to the multiple planetary shafts 4 better mesh with the half-shaft gears 7, so as to control the driving wheels at both ends to rotate at the same or different angular speeds, so as to adapt to the driving needs of the vehicle under different road conditions, thereby improving the driving stability and controllability of the vehicle.

[0085] In some embodiments of the present invention, Figure 1 , Figure 5-Figure 7 , Fig. 9 and Fig.10 As shown, the first planetary shaft 41 and the third planetary shaft 43 are connected as an integral part, and the connection between the first planetary shaft 41 and the third planetary shaft 43 is provided with a pipe through-hole 47 extending in the radial direction of the first planetary shaft 41 and penetrating therethrough, and the second planetary shaft 42 and the fourth planetary shaft 44 are provided with a protrusion 421 at one end close to the radial inner side of the housing 2, and the two protrusions 421 extend into the pipe through-hole 47 from both sides. Thus, through the cooperation of the protrusion 421 and the through-hole, the radial inner end of the second planetary shaft 42 and the fourth planetary shaft 44 close to the housing 2 can be fixedly connected to the connection between the first planetary shaft 41 and the third planetary shaft 43, so that the multiple planetary shafts 4 can form a cross structure, which can ensure the structural stability and cooperation stability between the planetary shafts 4, and further ensure the stability and reliability of the operation of the differential 100.

[0086] In some embodiments of the present invention, Figure 1 and Fig.10As shown, a bushing 61 is provided between the planetary shaft 4 and the mounting hole 211. The bushing 61 is specifically an annular structure, which can form an interference fit between the planetary shaft 4 and the mounting hole 211, thereby improving the connection stability between the planetary shaft 4 and the housing 2. In addition, when the planetary gear 3 rotates, the friction between the planetary gear 3 and the planetary shaft 4 will drive the planetary shaft 4 to rotate slightly around its own axis. At this time, the annular bushing 61 allows a slight relative rotation between the planetary shaft 4 and the bushing 61, while preventing the planetary shaft 4 from rubbing against the inner wall of the mounting hole 211.

[0087] Compared with the planetary pins in the prior art, the problem of planetary pins breaking and failing due to stress can be avoided, thereby better improving the connection stability between the planetary shaft 4 and the housing 2, and further improving the structural stability and operational reliability of the differential 100.

[0088] In some embodiments of the present invention, Figure 1 and Fig.10 As shown, a gasket 62 is provided between the planetary gear 3 and the housing 2, and the gasket 62 is sleeved on the planetary shaft 4. The gasket 62 can avoid direct friction between the planetary gear 3 and the housing 2, thereby reducing the wear of the planetary gear 3 and the housing 2, which is beneficial to improving the structural stability of the planetary gear 3 and the housing 2 and extending the service life of the planetary gear 3 and the housing 2, thereby improving the structural stability of the differential 100 and extending the service life of the differential 100.

[0089] In some embodiments, the washer 62 and the bushing 61 are integrated into one piece, which can further enhance the connection stability of the internal components of the differential 100 .

[0090] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the housing 2 includes: a rear differential housing 22 and a front differential housing 21, the rear differential housing 22 is connected to the main reduction gear 1, the front differential housing 21 is connected to the rear differential housing 22, the planetary gear 3 is arranged in the front differential housing 21, the mounting hole 211 is arranged on the front differential housing 21, and the limit and lubrication device 5 is sleeved outside the front differential housing 21. The housing 2 is divided into the rear differential housing 22 and the front differential housing 21, which is convenient for processing and production, and is conducive to assembling the planetary gear 3, the half-shaft gear 7, the planetary shaft 4 and other components into the housing 2, and the structural design is reasonable.

[0091] The transmission 200 according to the embodiment of the present invention will be described below.

[0092] The transmission 200 according to the embodiment of the present invention comprises: a case 8 and the above-mentioned differential 100 .

[0093] Specifically, Figure 8 , Fig. 9 and Fig.10As shown, the differential 100 is disposed in a housing 8, and the housing 8 serves to protect the differential 100, thereby ensuring the stable operation of the differential 100 and facilitating the installation of the differential 100 in a vehicle.

[0094] According to the transmission 200 of the embodiment of the present invention, by setting a plurality of mounting holes 211 spaced along the circumferential direction of the housing 2 on the peripheral wall of the housing 2 connected to the main reduction gear 1 and rotating synchronously, and making a plurality of planetary shafts 4 respectively penetrate into the plurality of mounting holes 211, the driving wheels at both ends can be controlled to rotate at the same or different angular velocities to adapt to the driving requirements of the vehicle under different road conditions, thereby improving the driving stability and controllability of the vehicle. At the same time, by setting the limit and lubrication device 5 outside the housing 2 and relative to the planetary shaft 4, it can play a role in positioning and limiting, avoiding the axial movement of the planetary shaft 4, improving the structural stability of the differential 100, and improving the stability and reliability of the operation of the differential 100. It can also reduce the friction and wear between the planetary shaft 4 and other components, thereby helping to extend the service life of the differential 100, and further improve the stability, reliability and service life of the transmission 200.

[0095] In some embodiments of the present invention, Fig. 9 and Fig.10 As shown, the bottom of the box 8 has oil 9, and the lower end of the limit and lubrication device 5 is located below the surface of the oil 9. In this way, it can be ensured that when the differential 100 is in operation, the oil 9 can stably enter the inside of the differential 100, thereby ensuring the lubrication effect and stability, thereby improving the operating performance, safety and stability of the transmission 200, and extending the service life of the transmission 200.

[0096] A powertrain according to an embodiment of the present invention includes: the transmission 200 mentioned above.

[0097] The powertrain may specifically be an electric assembly, a fuel assembly or a hybrid assembly.

[0098] According to the powertrain of the embodiment of the present invention, by setting a plurality of mounting holes 211 spaced along the circumferential direction of the housing 2 on the circumferential wall of the housing 2 connected to the main reduction gear 1 and rotating synchronously, and making a plurality of planetary shafts 4 respectively penetrate into the plurality of mounting holes 211, the driving wheels at both ends can be controlled to rotate at the same or different angular velocities to adapt to the driving requirements of the vehicle under different road conditions, thereby improving the driving stability and controllability of the vehicle. At the same time, by setting the limiter and lubricating device 5 outside the housing 2 and relative to the planetary shaft 4, it can play a role in positioning and limiting, avoiding the axial movement of the planetary shaft 4, improving the structural stability of the differential 100, and improving the stability and reliability of the operation of the differential 100. It can also reduce the friction and wear between the planetary shaft 4 and other components, thereby helping to extend the service life of the differential 100, thereby improving the stability, reliability and service life of the transmission 200, and further improving the stability, reliability and service life of the powertrain.

[0099] A vehicle according to an embodiment of the present invention includes: the above-mentioned power assembly.

[0100] According to the vehicle of the embodiment of the present invention, by setting a plurality of mounting holes 211 spaced along the circumferential direction of the housing 2 on the peripheral wall of the housing 2 connected to the main reduction gear 1 and rotating synchronously, and making a plurality of planetary shafts 4 respectively penetrate into the plurality of mounting holes 211, the driving wheels at both ends can be controlled to rotate at the same or different angular velocities to adapt to the driving requirements of the vehicle under different road conditions, thereby improving the driving stability and maneuverability of the vehicle. At the same time, by setting the limiting and lubricating device 5 outside the housing 2 and relative to the planetary shaft 4, it can play a role in positioning and limiting, avoiding the axial movement of the planetary shaft 4, improving the structural stability of the transmission 200, and improving the stability and reliability of the operation of the transmission 200. It can also reduce the friction and wear between the planetary shaft 4 and other components, thereby helping to extend the service life of the transmission 200, thereby improving the stability, reliability and service life of the powertrain, and further improving the driving stability and maneuverability of the vehicle.

[0101] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does 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.

[0102] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A differential, characterized in that: include: Main reduction gear; A housing, the housing is connected to the main reduction gear and rotates synchronously, and a peripheral wall of the housing has a plurality of mounting holes arranged at intervals along the circumferential direction of the housing; A planetary gear, wherein the planetary gear is a plurality of planetary gears arranged at intervals along the circumferential direction of the main reduction gear, and the planetary gears are arranged in the housing; A planetary shaft, wherein the planetary shaft is a plurality of shafts corresponding to the plurality of planetary gears, and the plurality of planetary shafts are respectively inserted into the plurality of mounting holes; A position limiting and lubricating device is sleeved outside the shell and arranged opposite to the planetary shaft.

2. The differential according to claim 1, characterized in that: The outer peripheral wall of the shell has an annular groove extending along the circumferential direction of the shell, the mounting hole is arranged in the annular groove, and the limiting and lubricating device is provided with a plurality of oil holes, and the plurality of oil holes are spaced apart in the circumferential direction of the limiting and lubricating device.

3. The differential according to claim 2, characterized in that: A groove extending along the circumferential direction of the position limiting and lubricating device is provided on the inner circumferential wall of the position limiting and lubricating device, and the oil hole passes through the bottom wall of the groove.

4. The differential according to claim 2, characterized in that: A baffle is provided on the outer peripheral wall of the position limiting and lubricating device, and the baffle is one or a plurality of baffles spaced apart along the circumferential direction of the position limiting and lubricating device.

5. The differential according to claim 4, characterized in that: The baffle is recessed in a direction opposite to the rotation direction of the limiting and lubricating device to form a recessed portion.

6. The differential according to claim 5, characterized in that: In the axial direction of the limiting and lubricating device, the baffle includes a first section and a second section connected in sequence, and the first section and the second section form a V shape.

7. The differential according to claim 5, characterized in that: There are multiple baffles, and the multiple baffles correspond to the multiple oil holes one by one. The oil holes are arranged at the bottom end of the recessed part.

8. The differential according to claim 4, characterized in that: The number of the baffles is less than or equal to 500; And / or, the height of the baffle is 1mm-20mm.

9. The differential according to claim 4, characterized in that: The limiting and lubricating device is a rubber part, a plastic part or a metal part.

10. The differential according to claim 2, characterized in that: An axial hole extending in the axial direction of the planetary shaft is provided on the end face of the planetary shaft close to the radial outer end of the shell, and a radial hole connected to the axial hole is also provided on the outer peripheral wall of the planetary shaft, and the radial hole extends in the radial direction of the planetary shaft.

11. The differential according to claim 10, characterized in that: There are a plurality of radial holes, and the plurality of radial holes are arranged at intervals along the axial direction of the planetary shaft and / or are arranged at intervals along the circumferential direction of the planetary shaft.

12. The differential according to claim 1, characterized in that: The plurality of planetary shafts include a first planetary shaft, a second planetary shaft, a third planetary shaft and a fourth planetary shaft, wherein the first planetary shaft and the third planetary shaft have axes that coincide with each other, and the second planetary shaft and the fourth planetary shaft have axes that coincide with each other and are perpendicular to the first planetary shaft.

13. The differential according to claim 12, characterized in that: The first planetary shaft and the third planetary shaft are connected as an integral piece, and a pipe through-hole extending in the radial direction of the first planetary shaft and penetrating the first planetary shaft is provided at the connection between the first planetary shaft and the third planetary shaft. The second planetary shaft and the fourth planetary shaft are both provided with a protruding portion at one end close to the radial inner side of the shell, and the two protruding portions extend into the tube through-hole from two sides respectively.

14. The differential according to claim 1, characterized in that: A bushing is provided between the planetary shaft and the mounting hole.

15. The differential according to claim 1, characterized in that A gasket is provided between the planetary gear and the housing, and the gasket is sleeved on the planetary shaft.

16. The differential according to claim 1, characterized in that The housing comprises: A rear differential housing, the rear differential housing being connected to the main reduction gear; A front differential housing, wherein the front differential housing is connected to the rear differential housing, the planetary gear is arranged in the front differential housing, the mounting hole is arranged on the front differential housing, and the limiting and lubricating device is sleeved outside the front differential housing.

17. A transmission, characterized in that: include: Box; The differential according to any one of claims 1-16, wherein the differential is disposed in the housing.

18. The transmission according to claim 17, characterized in that The bottom of the box body is provided with oil, and the lower end of the limit and lubrication device is located below the oil level.

19. A powertrain, characterized in that: Comprising a transmission according to claim 17 or 18.

20. A vehicle, characterized in that: Comprising a powertrain according to claim 19.

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