Torque induction self-locking differential device

Abstract

The utility model discloses a torque induction self-locking differential device, and relates to the technical field of differential devices. Comprising a shell, a left half shaft output gear, a right half shaft output gear, 2N worm shafts, 2N worm wheels and 2N supporting shafts, wherein the left half shaft output gear and the right half shaft output gear are arranged in the shell; the 2N supporting shafts are evenly distributed in the circumferential direction of the shell and fixedly arranged in the middle of the interior of the shell, the left half shaft output gear and the right half shaft output gear are arranged on the left side and the right side of the supporting shafts respectively and rotatably arranged in the shell, and the 2N worm wheels are rotatably arranged on the 2N supporting shafts in a sleeving mode respectively. A worm shaft is arranged between every two adjacent worm gears, the worm shafts are rotatably supported on the shell, each worm shaft is provided with a worm part and a gear part, each worm part is meshed with the two adjacent worm gears at the same time, and the gear parts of the two adjacent worm shafts are meshed with the left half shaft output gear and the right half shaft output gear respectively. The self-locking differential device is simple in design, manufacture and assembly and beneficial to popularization and application.

Description

Technical Field

[0001] The utility model relates to the technical field of differential devices, in particular to a torque-sensing self-locking differential device. Background Art

[0002] A differential with a locking function can improve the vehicle's ability to pass on bad roads. That is, when one of the vehicle's wheels is idling, the differential can be quickly locked, making the two wheels rigidly connected, thereby transmitting the driving force to the non-slip wheel to allow the vehicle to continue moving.

[0003] The existing differential with locking function uses a clutch device installed on the left and right half-shaft output gear shafts, and the electromechanical actuator or electro-hydraulic actuator operates the clutch device to lock the left and right half-shaft output gears and the differential housing, forcing the left and right half-shaft output gears and the differential housing to be differentially locked. There is also a Torsen differential A with a worm gear structure, which realizes the differential locking function by using the self-locking characteristics of the worm gear and the structure of unidirectional transmission of torque from the worm wheel to the worm, but its structure is complex and difficult to assemble.

[0004] However, the market also expects a self-locking differential device with a simpler structure and simplified assembly process. Summary of the invention

[0005] To achieve the above object, the utility model provides the following technical solution: a torque-sensing self-locking differential device, comprising: a housing, a left half-shaft output gear and a right half-shaft output gear arranged inside the housing, 2N worm shafts, 2N worm wheels and 2N support shafts, where N is an integer greater than or equal to 1;

[0006] 2N supporting shafts are evenly distributed along the circumference of the housing and fixedly arranged at the middle position inside the housing, the left half-shaft output gear and the right half-shaft output gear are respectively arranged on the left and right sides of the supporting shaft and rotatably arranged inside the housing, and the 2N worm gears are respectively rotatably sleeved on the 2N supporting shafts;

[0007] A worm shaft is arranged between every two adjacent worm wheels. The worm shaft is rotatably supported on the housing. The worm shaft has a worm portion and a gear portion. The worm portion is meshed with two adjacent worm wheels at the same time, and the gear portions of the two adjacent worm shafts are respectively meshed with the left half-shaft output gear and the right half-shaft output gear.

[0008] As a preferred technical solution of the utility model, the axes of the support shafts are all in one plane and intersect perpendicularly with the axis of the housing;

[0009] The axes of the worm shafts are parallel to the axis of the housing;

[0010] The axes of the worm wheels are all in one plane.

[0011] As a preferred technical solution of the present utility model, N=2.

[0012] As a preferred technical solution of the utility model, the four support shafts are fixedly connected to the center block.

[0013] As a preferred technical solution of the present utility model, N=3.

[0014] As a preferred technical solution of the utility model, the six support shafts are fixedly connected to the central block.

[0015] Compared with the prior art, the utility model provides a torque-sensing self-locking differential device, which has the following beneficial effects:

[0016] The existing Torsen differential has six worm gear shafts and is divided into two groups. Each group of three worm gear shafts is configured into an equilateral triangle, and the worm as the half-shaft output gear is sandwiched between the three worm gear shafts and meshes with them. The positioning accuracy requirement is extremely high and the worm diameter is large and the worm wheel diameter is small. In conventional mechanical design, the worm diameter is small and the worm wheel diameter is large, which makes the overall internal structure of the Torsen differential very different from the conventional mechanical design, which inevitably brings special requirements for design and manufacturing. The sizes of the worm shaft and the worm wheel in the self-locking differential device conform to the conventional size relationship, so its design and manufacturing are necessarily simpler than those of the Torsen differential.

[0017] In addition, in the Torsen differential, the axes of the three worm gear shafts on one side are in one plane, and there are two planes on both sides, and the worm gear shafts on both sides are also meshed and driven by the gears at their shaft ends, so there must be strict requirements on the axial distance between the two planes, that is, there are two key planes for the worm gear system and the dimensional coupling relationship between the two planes is very close. For the worm gear system of the self-locking differential device, the axes of all worm gears are only in one key plane, so the assembly of the self-locking differential device is also simpler than that of the Torsen differential. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a torque-sensing self-locking differential device according to the first embodiment of the utility model.

[0019] Figure 2 for Figure 1 A schematic diagram of the internal structure of a torque-sensing self-locking differential device according to the first embodiment is shown.

[0020] Figure 3 It is a schematic structural diagram of a torque-sensing self-locking differential device according to the second embodiment of the present utility model.

[0021] Figure 4 for Figure 3A schematic diagram of the internal structure of a torque-sensing self-locking differential device according to a second embodiment is shown.

[0022] In the figure: 1, housing; 21, left half shaft output gear; 22, right half shaft output gear; 31, first worm shaft; 311, first worm part; 312, first gear part; 32, second worm shaft; 321, second worm part; 322, second gear part; 33, third worm shaft; 331, third worm part; 332, third gear part; 34, fourth worm shaft; 341, fourth worm part; 342, fourth gear part; 35, fifth worm shaft; 361, fourth worm part; 362, fourth gear part; 363, fifth worm shaft; 364, fifth worm shaft; 365, fifth worm shaft; 366, fifth worm shaft; 367, fifth worm shaft; 368, fifth worm shaft; 369, fifth worm shaft; 370, fifth worm shaft; 371, fifth worm shaft; 372, fifth gear part; 373, fifth worm shaft; 374, fifth worm shaft; 375, fifth worm shaft; 376, fifth worm shaft; 377, fifth worm shaft; 378, fifth worm shaft; 379, fifth worm shaft; 380, fifth worm shaft; 381, fifth worm shaft; 382, ​​fifth gear part; 383, fifth worm shaft; 384, fifth worm shaft; 385, fifth worm shaft; 386, fifth worm shaft; 387, fifth worm shaft; 388, fifth worm shaft; 389, fifth worm shaft; 390, fifth worm shaft; 401, fifth worm shaft; 402, fifth gear part; 413, fifth worm shaft; 421, fifth worm shaft; 422, fifth gear part; 430, fifth worm shaft; 431, fifth 51. fifth worm portion; 352. fifth gear portion; 36. sixth worm shaft; 361. sixth worm portion; 362. sixth gear portion; 41. first worm wheel; 42. second worm wheel; 43. third worm wheel; 44. fourth worm wheel; 45. fifth worm wheel; 46. sixth worm wheel; 51. first support shaft; 52. second support shaft; 53. third support shaft; 54. fourth support shaft; 55. fifth support shaft; 56. sixth support shaft; 57. center block. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Embodiment 1:

[0024] like Figure 1 and Figure 2 As shown, a torque-sensing self-locking differential device includes: a housing 1, and a left half-shaft output gear 21 and a right half-shaft output gear 22 arranged inside the housing 1, a first worm shaft 31, a second worm shaft 32, a third worm shaft 33 and a fourth worm shaft 34, a first worm wheel 41, a second worm wheel 42, a third worm wheel 43 and a fourth worm wheel 44, and a first support shaft 51, a second support shaft 52, a third support shaft 53 and a fourth support shaft 54;

[0025] The first support shaft 51, the second support shaft 52, the third support shaft 53 and the fourth support shaft 54 ​​are evenly distributed along the circumference of the housing 1 and fixed in the middle position inside the housing 1. The left half shaft output gear 21 and the right half shaft output gear 22 are respectively arranged on the left and right sides of the first support shaft 51, the second support shaft 52, the third support shaft 53 and the fourth support shaft 54. The first worm gear 41, the second worm gear 42, the third worm gear 43 and the fourth worm gear 44 are respectively sleeved on the first support shaft 51, the second support shaft 52, the third support shaft 53 and the fourth support shaft 54;

[0026] The first worm shaft 31 has a first worm portion 311 and a first gear portion 312 . The first worm portion 311 is meshed with the first worm wheel 41 and the second worm wheel 42 . The first gear portion 312 is meshed with the left half shaft output gear 21 .

[0027] The second worm shaft 32 has a second worm portion 321 and a second gear portion 322 . The second worm portion 321 is meshed with the second worm gear 42 and the third worm gear 43 . The second gear portion 322 is meshed with the right half shaft output gear 22 .

[0028] The third worm shaft 33 has a third worm portion 331 and a third gear portion 332. The third worm portion 331 is meshed with the third worm gear 43 and the fourth worm gear 44 at the same time, and the third gear portion 332 is meshed with the left half shaft output gear 21.

[0029] The fourth worm shaft 34 includes a fourth worm portion 341 and a fourth gear portion 342 . The fourth worm portion 341 meshes with both the fourth worm wheel 44 and the first worm wheel 41 , and the fourth gear portion 342 meshes with the right half shaft output gear 22 .

[0030] Figure 1 and Figure 2 An embodiment with four support shafts is given, in which the first support shaft 51, the second support shaft 52, the third support shaft 53 and the fourth support shaft 54 ​​are fixedly connected to the central block 57 to form a cross shaft, and the angle between two adjacent support shafts is 90°; the cross shaft can be formed by splicing or made in one piece, and can be flexibly selected according to actual needs in combination with the split shell surface of the shell 1.

[0031] The gear portion of the worm shaft and the half-shaft output gear can be implemented by spur gears or helical gears, and other types of gears are also possible, and are not limited thereto.

[0032] In addition, a smaller even number of support shafts, such as 2 support shafts, may be provided on the central block 57 , or a larger even number of support shafts, such as 6 support shafts, may be provided. Embodiment 2:

[0033] like Figure 3 and Figure 4 As shown, a torque-sensing self-locking differential device comprises: a housing 1, and a left half-shaft output gear 21 and a right half-shaft output gear 22 arranged inside the housing 1, a first worm shaft 31, a second worm shaft 32, a third worm shaft 33, a fourth worm shaft 34, a fifth worm shaft 35 and a sixth worm shaft 36, a first worm wheel 41, a second worm wheel 42, a third worm wheel 43, a fourth worm wheel 44, a fifth worm wheel 45 and a sixth worm wheel 46, and a first support shaft 51, a second support shaft 52, a third support shaft 53, a fourth support shaft 54, a fifth support shaft 55 and a sixth support shaft 56;

[0034] The first support shaft 51, the second support shaft 52, the third support shaft 53, the fourth support shaft 54, the fifth support shaft 55 and the sixth support shaft 56 are evenly distributed along the circumference of the housing 1 and fixed in the middle position inside the housing 1, the left half shaft output gear 21 and the right half shaft output gear 22 are respectively arranged on the left and right sides of the first support shaft 51, the second support shaft 52, the third support shaft 53, the fourth support shaft 54, the fifth support shaft 55 and the sixth support shaft 56, and the first worm gear 41, the second worm gear 42, the third worm gear 43, the fourth worm gear 44, the fifth worm gear 45 and the sixth worm gear 46 are respectively sleeved on the first support shaft 51, the second support shaft 52, the third support shaft 53, the fourth support shaft 54, the fifth support shaft 55 and the sixth support shaft 56;

[0035] The first worm shaft 31 has a first worm portion 311 and a first gear portion 312 . The first worm portion 311 is meshed with the first worm wheel 41 and the second worm wheel 42 . The first gear portion 312 is meshed with the left half shaft output gear 21 .

[0036] The second worm shaft 32 has a second worm portion 321 and a second gear portion 322 . The second worm portion 321 is meshed with the second worm gear 42 and the third worm gear 43 . The second gear portion 322 is meshed with the right half shaft output gear 22 .

[0037] The third worm shaft 33 has a third worm portion 331 and a third gear portion 332. The third worm portion 331 is meshed with the third worm gear 43 and the fourth worm gear 44 at the same time, and the third gear portion 332 is meshed with the left half shaft output gear 21.

[0038] The fourth worm shaft 34 has a fourth worm portion 341 and a fourth gear portion 342 . The fourth worm portion 341 is meshed with the fourth worm gear 44 and the fifth worm gear 45 . The fourth gear portion 342 is meshed with the right half shaft output gear 22 .

[0039] The fifth worm shaft 35 has a fifth worm portion 351 and a fifth gear portion 352. The fifth worm portion 351 is meshed with the fifth worm gear 45 and the sixth worm gear 46 at the same time, and the fifth gear portion 352 is meshed with the left half shaft output gear 21.

[0040] The sixth worm shaft 36 includes a sixth worm portion 361 and a sixth gear portion 362 . The sixth worm portion 361 meshes with both the sixth worm wheel 46 and the first worm wheel 41 , and the sixth gear portion 362 meshes with the right half shaft output gear 22 .

[0041] In this embodiment, the axis angle between two adjacent support shafts is 60°. More worm shafts increase the number of gear parts meshing with the left half shaft output gear 21 or the right half shaft output gear 22, thereby improving the strength. The appropriate number of support shafts can be selected according to the actual or available internal space of the housing 1.

[0042] In addition, the central block 57 may be eliminated, and the support shafts uniformly distributed along the circumference of the shell 1 may be directly fixed to the shell 1 .

[0043] It should be noted that the first and second embodiments of the present invention only illustrate the cases where N=2 and N=3. In actual situations, N can be any integer greater than or equal to 1.

[0044] In summary, 2N support shafts are evenly distributed along the circumferential direction inside the housing 1 to support 2N worm gears, and there are also 2N worm shafts sandwiched between two adjacent worm gears, and there are N gear parts meshing with the left half-shaft output gear 21, and there are also N gear parts meshing with the right half-shaft output gear 22. Moreover, the axes of all support shafts are in a plane and intersect perpendicularly with the axis of the housing 1, the angle between two adjacent support shafts is 180° / N, and the axes of all worm shafts are parallel to the axis of the housing 1.

[0045] The existing Torsen differential has six worm gear shafts and is divided into two groups. Each group of three worm gear shafts is configured into an equilateral triangle, and the worm as the half-shaft output gear is sandwiched between the three worm gear shafts and meshes with them. The positioning accuracy requirement is extremely high and the worm diameter is large and the worm wheel diameter is small. In conventional mechanical design, the worm diameter is small and the worm wheel diameter is large, which makes the overall internal structure of the Torsen differential very different from the conventional mechanical design, which inevitably brings special requirements for design and manufacturing. The sizes of the worm shaft and the worm wheel in the self-locking differential device conform to the conventional size relationship, so its design and manufacturing are necessarily simpler than those of the Torsen differential.

[0046] In addition, in the Torsen differential, the axes of the three worm gear shafts on one side are in one plane, and there are two planes on both sides, and the worm gear shafts on both sides are also meshed and driven by the gears at their shaft ends, so there must be strict requirements on the axial distance between the two planes, that is, there are two key planes for the worm gear system and the dimensional coupling relationship between the two planes is very close. For the worm gear system of the self-locking differential device, the axes of all worm gears are only in one key plane, so the assembly of the self-locking differential device is also simpler than that of the Torsen differential.

[0047] It should be noted that, in this article, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0048] Although 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 appended claims and their equivalents.

Claims

1. A torque-sensing self-locking differential device, characterized in that: include: A housing, a left half-shaft output gear and a right half-shaft output gear, 2N worm shafts, 2N worm wheels and 2N support shafts arranged inside the housing, where N is an integer greater than or equal to 1; 2N supporting shafts are evenly distributed along the circumference of the housing and fixedly arranged at the middle position inside the housing, the left half-shaft output gear and the right half-shaft output gear are respectively arranged on the left and right sides of the supporting shaft and rotatably arranged inside the housing, and the 2N worm gears are respectively rotatably sleeved on the 2N supporting shafts; A worm shaft is arranged between every two adjacent worm wheels. The worm shaft is rotatably supported on the housing. The worm shaft has a worm portion and a gear portion. The worm portion is meshed with two adjacent worm wheels at the same time, and the gear portions of the two adjacent worm shafts are respectively meshed with the left half-shaft output gear and the right half-shaft output gear.

2. A torque-sensing self-locking differential device according to claim 1, characterized in that: The axes of the support shafts are all in one plane and intersect perpendicularly with the axis of the housing; The axes of the worm shafts are parallel to the axis of the housing; The axes of the worm wheels are all in one plane.

3. The torque-sensing self-locking differential device according to claim 1, characterized in that: N=2。 4. A torque-sensing self-locking differential device according to claim 3, characterized in that: The four support shafts are fixedly connected to the central block.

5. The torque-sensing self-locking differential device according to claim 1, characterized in that: N=3。 6. A torque-sensing self-locking differential device according to claim 5, characterized in that: The six support shafts are fixedly connected to the central block.

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