Novel differential spider

Abstract

The invention relates to a novel differential spider, which relates to the field of automobile parts, is mainly used for supporting a planetary gear, transmitting torque and realizing differential rotation of left and right wheels, and comprises a workpiece which comprises a main body part and a plurality of arc bosses, and the arc bosses are arranged on the main body part at intervals along the circumferential direction; the positioning tool comprises a plurality of V-shaped grooves, the V-shaped grooves are formed in the positioning tool at intervals in the circumferential direction, and the arc bosses abut against the corresponding V-shaped grooves for positioning; the V-shaped groove extrudes the arc boss, so that the positioning tool has a positioning effect on the workpiece, huge torque and vibration generated in the machining process can be effectively resisted, the workpiece is firmly fixed, and the core problems that the workpiece is prone to slipping and positioning is not firm due to insufficient meshing force are solved.

Description

Technical Field

[0001] This invention relates to the field of automotive parts, and in particular to a novel differential cross shaft. Background Technology

[0002] Precise positioning of the differential cross shaft is a core element in ensuring the performance, lifespan, and reliability of the differential and even the entire drive axle. However, existing technologies have inherent limitations in processing, assembly, and testing, making it difficult to achieve this core requirement economically and efficiently, resulting in technical bottlenecks in product noise, lifespan, and consistency. For example, Chinese patent application No. 202420376922.1, entitled "A Differential Cross Shaft Positioning Fixture," discloses a differential cross shaft positioning fixture, including a positioning block and a floating positioning block. Each of the four corners of the positioning block has a protrusion, and each protrusion has a through-hole for inserting clamping teeth. The tips of the clamping teeth protrude from the upper surface of the positioning block to clamp and position the end face of the differential cross shaft blank. The upper end face of the differential cross shaft blank has four protrusions evenly distributed along its circumference. Using pointed teeth for positioning results in insufficient clamping force, and the workpiece is prone to slippage during processing, leading to unstable positioning. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defect of unstable positioning during the machining process of the differential cross shaft in the prior art, thereby providing a new type of differential cross shaft.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A novel differential cross shaft includes: The workpiece includes a main body and a plurality of arc-shaped bosses, each of which is spaced apart on the main body along the circumferential direction. The positioning fixture includes multiple V-shaped grooves, each of which is spaced apart along the circumferential direction on the positioning fixture, and each arc-shaped boss abuts against and is positioned with the corresponding V-shaped groove.

[0005] Preferably, the included angles between adjacent arc bosses are the same, and the included angles between adjacent V-grooves are the same; during processing, this multi-point, symmetrical force pattern avoids the concentration of external pressure, improves the firmness of positioning and anti-interference ability, and effectively prevents the workpiece from slipping or deflecting during processing.

[0006] Preferably, the main body is columnar and has an assembly hole extending through it in the axial direction; each of the arc-shaped bosses is located on one side of the main body in the axial direction; the assembly hole is used to cooperate with other transmission components; compared with the side wall, it can better withstand the clamping force from the V-groove, ensuring the structural rigidity and stability of the workpiece during processing, effectively preventing deformation caused by uneven force, thereby ensuring the processing accuracy of the final product.

[0007] Preferably, the workpiece further includes multiple cylindrical portions, each of which is spaced apart on the outer ring surface of the main body along the circumferential direction; since the workpiece is reliably positioned and there is no risk of slippage, it can ensure that the coaxiality error of the four cylindrical portions relative to the central hole is small, and the dimensions and surface quality of each journal are highly consistent, thereby producing a differential cross shaft product with superior performance, low noise and long service life.

[0008] Preferably, the projections of the arc-shaped bosses and the cylindrical portions are spaced apart along the vertical direction; the included angles between adjacent arc-shaped bosses and the cylindrical portions are all the same; the main body disperses the clamping force on the cylindrical portions, thereby protecting the structural integrity of the cylindrical portions, preventing minor deformations or damage caused by clamping, and providing working space for subsequent processing.

[0009] Preferably, the positioning fixture is rectangular, and the V-grooves are located at the four corners of the positioning fixture. Since the positions of the arc boss, the cylindrical part, and the V-grooves are all fixed, after the workpiece and the positioning fixture are assembled, the position of the cylindrical part of the corresponding workpiece can be quickly found. Its spatial position is a constant value that can be calculated in advance through geometric relationships, which simplifies CNC programming and eliminates the positioning error caused by repeated clamping of the workpiece, realizing true zero-alignment machining.

[0010] Preferably, the V-groove includes two inclined surfaces and one arc surface. The two inclined surfaces are connected to the arc surface and are symmetrically distributed with the arc surface as the center. The arc boss abuts against both inclined surfaces, and the arc surface and the arc boss are spaced apart. The arc surface can collect metal chips that fall during processing, preventing metal chips from accumulating on the inclined surface, thereby avoiding positioning inaccuracies or workpiece scratches caused by foreign objects. The smooth transition of the arc surface also eliminates the concentration of external pressure at sharp corners, improving the impact resistance and service life of the V-groove.

[0011] Preferably, the side of the workpiece with the arc-shaped boss and the side of the positioning fixture with the V-shaped groove are spaced apart; the positioning accuracy will not be affected by the flatness error, burrs or small debris that may exist on the end face of the workpiece or the top surface of the positioning fixture.

[0012] Preferably, the inner side of the arc-shaped boss is inclined along the radial outer side of the main body, and the radial thickness of the arc-shaped boss gradually decreases along the axial direction away from the main body; when the differential cross shaft rotates at high speed and transmits torque, it can effectively guide the pressure from the outside, so that the pressure concentration area transitions smoothly from the root to the end, effectively reducing the pressure peak at the root, thereby improving the fatigue strength and service life of the differential cross shaft.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The novel differential cross shaft provided in the above technical solution includes a workpiece and a positioning fixture. The workpiece comprises a main body and multiple arc-shaped bosses, each spaced circumferentially on the main body. The positioning fixture includes multiple V-grooves, each spaced circumferentially on the positioning fixture. Each arc-shaped boss abuts against its corresponding V-groove for positioning. The V-grooves exert pressure on the arc-shaped bosses, enabling the positioning fixture to position the workpiece. This effectively resists the enormous torque and vibration generated during processing, firmly fixing the workpiece and thus solving the core problem of workpiece slippage and insecure positioning caused by insufficient clamping force. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a top view of the workpiece provided in an embodiment of the present invention; Figure 2 This is a cross-sectional view of the workpiece provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the positioning fixture provided in an embodiment of the present invention; Figure 4 This is a cross-sectional view of the positioning fixture provided in an embodiment of the present invention; Figure 5 This is a top view of the positioning fixture provided in an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached figures: 1. Workpiece; 11. Main body; 12. Arc boss; 13. Assembly hole; 14. Cylindrical part; 2. Positioning fixture; 21. V-groove; 211. Inclined surface; 212. Arc surface. Detailed Implementation

[0017] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] Please read carefully. Figures 1 to 5 This invention provides a novel differential cross shaft, comprising: a workpiece 1 and a positioning fixture 2. For details, please refer to... Figure 1 Workpiece 1 includes a main body 11 and multiple arc-shaped bosses 12. Four arc-shaped bosses 12 can be provided, and these four bosses 12 are spaced apart along the circumferential direction on the main body 11. Positioning fixture 2 includes multiple V-grooves 21. (See attached image.) Figure 3 Four V-grooves 21 are provided, and each V-groove 21 is spaced apart on the positioning fixture 2 along the circumferential direction. Each arc boss 12 abuts and is positioned with the corresponding V-groove 21. During the processing, the arc boss 12 of the workpiece 1 is placed into the corresponding V-groove 21 of the positioning fixture 2, so that the two abut tightly. The two inclined surfaces 211 of the V-groove 21 will exert a strong squeezing force on the arc boss 12 from both sides, effectively resisting the torque generated during processing, restricting the degree of freedom of the workpiece 1 in multiple directions, and preventing the workpiece 1 from rotating or shifting. This design makes the workpiece 1 firmly positioned during the processing and not easy to slip.

[0021] Taking automated turning as an example, the automated turning process, combined with a dedicated positioning fixture 2, achieves high-precision forming. The first step is blank preparation and loading: The differential cross shaft blank is made by forging or cold extrusion, and its structure includes a central main body 11, four cylindrical parts 14, and arc-shaped bosses 12. The surfaces of the four arc-shaped bosses 12 on the unprocessed workpiece 1 serve as positioning references, precisely engaging with the V-grooves 21 of the positioning fixture 2. A robot or robotic arm places the unprocessed workpiece 1 on the positioning fixture 2. At this time, the surface of the arc-shaped bosses 12 contacts the V-grooves 21, and the middle plane of the unprocessed workpiece 1 maintains a gap with the top surface of the positioning fixture 2, forming a floating support state. This design allows the workpiece 1 to automatically fine-tune under gravity, avoiding deformation caused by forced contact. The second step is automatic centering and pre-positioning: The two inclined surfaces 211 of the V-groove 21 form line contact with the surface of the arc-shaped bosses 12, achieving radial centering of the workpiece 1 through geometric constraints. The floating support formed by workpiece 1 and positioning fixture 2 serves to support workpiece 1 and absorb dimensional deviations. When workpiece 1 falls into the V-groove 21, it can move axially, aligning the four arc-shaped bosses 12 synchronously and ensuring that the central axis coincides with the lathe spindle. This process requires no manual intervention, solving the over-positioning problem caused by blank bending in traditional three-V block positioning.

[0022] It's important to understand that a traditional three-V-block positioning system typically consists of three fixed V-blocks. Two main positioning V-blocks provide primary support and are fixed to the machine tool table or fixture, restricting most degrees of freedom of workpiece 1. One auxiliary V-block, usually a short V-shaped structure with a lower height, is used only to supplementally restrict the rotational degree of freedom of workpiece 1, preventing over-positioning. Differential cross shaft blanks often exhibit journal bending deformation due to the forging process. When the three V-blocks are forcibly positioned, at least one V-groove contacts the journal on one side, causing workpiece 1 to undergo elastic deformation under pressure.

[0023] Step 3, Clamping and Fixing: After pre-positioning, the lathe's hydraulic clamping block moves down, completely clamping workpiece 1. The clamping force is transmitted to the middle plane of workpiece 1 through the top surface of the fixture. At the same time, the four arc-shaped bosses 12 of workpiece 1 are embedded into the four V-shaped grooves 21 of the positioning fixture 2, restricting the rotational degrees of freedom. At this time, workpiece 1 changes from floating support to rigid fixation. The lateral constraint of the V-shaped grooves 21 and the axial locking of the clamping teeth together constitute a six-degree-of-freedom constraint, preventing vibration or displacement during processing. Step 4, Turning: After workpiece 1 is fixed, the lathe spindle drives workpiece 1 to rotate, and the cutting tool performs turning of the journal outer circle and end face. The machining is divided into two stages: rough turning and finish turning. Rough turning removes the main excess material, and finish turning ensures dimensional accuracy and surface roughness. Step 5, Blanking and Inspection: After machining is completed, the clamping block retracts, and the robot removes the finished product. The finished product is inspected online to confirm that the dimensions, position, and surface quality of the cylindrical part 14 meet the standards.

[0024] It is conceivable that in this design, the included angles between adjacent arc-shaped bosses 12 are the same, and the included angles between adjacent V-shaped grooves 21 are the same. Specifically, four arc-shaped bosses 12 are provided on the main body 11 of the workpiece 1. These four arc-shaped bosses 12 are evenly distributed at equal intervals along the circumference of the main body 11, forming a cross-shaped symmetrical precision structure. This means that, with the center of the workpiece 1 as the vertex, the included angle formed by the center lines of any two adjacent arc-shaped bosses 12 is precisely 90°. Correspondingly, four V-shaped grooves 21 are also provided on the positioning fixture 2. These four V-shaped grooves 21 are evenly distributed along the circumference of the positioning fixture 2, and the included angle between the central symmetry planes of any two adjacent V-shaped grooves 21 is also precisely 90°. This design ensures that when the workpiece 1 is placed on the positioning fixture 2, each arc-shaped boss 12 can be precisely embedded in a corresponding V-shaped groove 21, forming a one-to-one abutment relationship.

[0025] When workpiece 1 is placed on positioning fixture 2, the inclined surfaces 211 of the four V-grooves 21 simultaneously apply radial guiding forces to the four arc-shaped bosses 12. Because these guiding forces are perfectly symmetrical circumferentially, even minute positional deviations are automatically corrected, allowing the geometric center of workpiece 1 to quickly coincide with the positioning center of positioning fixture 2, achieving high-precision centering without manual intervention. Secondly, it ensures the stability and consistency of positioning. During processing, both cutting forces from the tool and impact forces from the stamping equipment are stably absorbed and transmitted through these four evenly distributed contact points. This multi-point, symmetrical force distribution pattern avoids external pressure concentration, enhances the robustness and anti-interference capability of positioning, and effectively prevents workpiece 1 from slipping or deflecting during processing.

[0026] As can be seen, in this design, the main body 11 is designed as a regular cylinder, its core function being to serve as the structural base for the entire differential cross shaft. A through-hole 13 is precisely machined along the central axis of this cylinder. This through-hole 13 not only serves as a crucial connection reference for the subsequent assembly of other transmission components, such as planetary gears, but also acts as an auxiliary positioning or clamping reference during machining. The innovative layout of this design lies in the fact that four arc-shaped bosses 12 are centrally and regularly arranged on one end face of the cylinder's axial direction. This end face thus becomes a clearly defined positioning surface.

[0027] This design provides a positioning reference surface for workpiece 1. First, it simplifies the positioning logic. When workpiece 1 mates with positioning fixture 2, simply aligning the positioning surface with the arc-shaped boss 12 towards fixture 2 achieves simultaneous docking of positioning features, avoiding interference and error accumulation that may occur with multiple reference positioning. Second, this design achieves physical separation of positioning and machining. Positioning fixture 2 firmly clamps and positions workpiece 1 from one end, while the machine tool can perform turning machining on parts such as the journal of workpiece 1 from the other end. The two do not interfere with each other, providing working space for automated machining. Finally, placing the arc-shaped boss 12 on a solid end face, compared to placing it on the side wall, allows it to better withstand the clamping force from the V-groove 21, ensuring the structural rigidity and stability of workpiece 1 during machining, effectively preventing deformation caused by uneven force, and thus ensuring the machining accuracy of the final product.

[0028] As can be conceived, in this design, workpiece 1 also includes multiple cylindrical portions 14, which are essentially the core functional components of the differential cross shaft—namely, the four journals. They are integrally formed with the main body 11 and extend radially outward from the outer circumferential surface of the main body 11. These four cylindrical portions 14 are evenly arranged at precise 90-degree intervals along the circumference, together forming a cross-shaped structure. This integrated design ensures the overall structural strength and rigidity of workpiece 1.

[0029] This design clearly defines the service target and ultimate goal of the positioning fixture 2 in this solution. These cylindrical parts 14 are the key working surfaces for the differential cross shaft to mesh with the planetary gears and transmit torque. Their dimensional accuracy, coaxiality, and surface finish directly determine the performance and lifespan of the entire differential. The fundamental purpose of this solution is to create a solid machining datum by setting an arc-shaped boss 12 on the end face of the workpiece 1 and mate it with the V-groove 21 tooling. Once the workpiece 1 is precisely positioned, the machine tool can perform high-precision turning or grinding on these four cylindrical parts 14. Due to the reliable positioning and the absence of slippage risk, it can ensure that the coaxiality error of the four cylindrical parts 14 relative to the center hole is small, and that the dimensions and surface quality of each journal are highly consistent, thereby producing a differential cross shaft product with superior performance, low noise, and long service life.

[0030] It is conceivable that, in this design, when viewed by projection from the axial direction of workpiece 1, the projected outline of the arc-shaped boss 12 on the end face of the main body 11 is completely offset from and does not overlap with the projected outline of the cylindrical part 14 extending radially from the outer annular surface of the main body 11. Specifically, any arc-shaped boss 12 is precisely located on the angle bisector between two adjacent cylindrical parts 14, which means that each arc-shaped boss 12 forms a constant 45-degree angle with the adjacent cylindrical part 14.

[0031] This design optimizes the transmission path of clamping force, avoiding the concentration of external pressure in critical areas. When the V-groove 21 clamps the arc-shaped boss 12, the clamping force is transmitted through the main body 11 of the workpiece 1. Since the arc-shaped boss 12 is radially offset from the cylindrical portion 14, the strong clamping force does not directly act on the root of the connection between the cylindrical portion 14 and the main body 11—an area sensitive to external pressure—but is dispersed through the more robust main body 11, thereby protecting the structural integrity of the cylindrical portion 14 and preventing minor deformation or damage caused by clamping. Secondly, it provides an unobstructed toolpath for subsequent machining. Since the positioning boss is spatially offset from the cylindrical portion 14 to be machined by 45 degrees, the V-groove 21 of the positioning fixture 2 will not physically interfere with the turning or grinding operations of the cylindrical portion 14. This ensures that the tool can perform complete and continuous machining along the entire length of the cylindrical portion 14, without the need for segmented operations or the use of special tools to avoid the fixture, improving the convenience of machining and the final surface quality.

[0032] As can be conceived, in this design, the positioning fixture 2 is designed as a cuboid with a clearly defined reference surface, with four V-grooves 21 positioned at the four corners of its top surface, forming a symmetrical positioning matrix. Simultaneously, the arc-shaped bosses 12 on the workpiece 1 maintain a strictly identical included angle with the cylindrical portion 14. The ingenuity of this design lies in its ability to mirror the geometric symmetry of the workpiece 1 with the physical symmetry of the positioning fixture 2. When the workpiece 1 is placed on the positioning fixture 2, each of its arc-shaped bosses 12 can precisely embed into a corner V-groove 21, thereby aligning the center of symmetry of the workpiece 1 with the geometric center of the positioning fixture 2.

[0033] On the one hand, it achieves the fixation of workpiece 1; on the other hand, at the instant of clamping, a coordinate system with a completely determined spatial vector relationship is established from the center of the V-groove 21 to the center line of the cylindrical part 14. Since the angle between the arc boss 12 of workpiece 1 and the cylindrical part 14 is constant, and the position of the V-groove 21 of the positioning fixture 2 is fixed, once the fixture is installed on the machine tool, the machine tool control system no longer needs to find the precise position of the cylindrical part 14 through detection or trial cutting. Its spatial position is a constant value that can be calculated in advance through geometric relationships. This simplifies CNC programming and fundamentally eliminates the positioning error caused by repeated clamping of workpiece 1, realizing true zero-alignment machining.

[0034] As can be seen, in this design, the two inclined surfaces 211 serve as the main positioning contact surfaces, forming two precise line contacts with the arc-shaped boss 12 of the workpiece 1, thereby achieving self-centering. The arc-shaped surface 212 located at the bottom of the two inclined surfaces 211 maintains a predetermined gap with the arc-shaped boss 12, preventing contact between them. During high-speed automated machining, metal chips, coolant, and minute impurities are unavoidable. This space effectively collects these debris, preventing their accumulation on the critical inclined surface 211, thus completely avoiding positioning inaccuracies or scratches on the workpiece 1 caused by foreign objects. Furthermore, the smooth transition of the arc-shaped surface 212 eliminates external pressure concentration at sharp corners, improving the impact resistance and service life of the V-groove 21, ensuring the accuracy, stability, and reliability of the positioning fixture 2 during long-term, high-load production. This detailed design is a crucial element in ensuring the continuous and trouble-free operation of the automated production line.

[0035] It is conceivable that, in this scheme, when the arc-shaped boss 12 of workpiece 1 is placed in the V-groove 21 of the positioning fixture 2 for initial positioning, a preset and controllable gap is always maintained between the entire end face of workpiece 1 with the arc-shaped boss 12 and the top surface of the positioning fixture 2 with the V-groove 21. This means that, in the initial positioning stage, the weight and positioning force of workpiece 1 are entirely borne by the inclined surface 211 of the V-groove 21, while the large-area end face of workpiece 1 is in a suspended state. Its positioning accuracy will not be affected by any flatness errors, burrs, or small debris that may exist on the end face of workpiece 1 or the top surface of the positioning fixture 2.

[0036] It is conceivable that in this design, the inner surface of the arc-shaped boss 12 is not perpendicular to the axis of the main body 11, but is smoothly inclined along the radial outer side. Furthermore, along the axial direction away from the main body 11, the radial thickness of the arc-shaped boss 12 gradually decreases from thick to thin. When the differential cross shaft rotates at high speed and transmits torque, it can effectively guide external pressure, allowing the pressure concentration area to smoothly transition from the root to the end, effectively reducing the pressure peak at the root, thereby improving the fatigue strength and service life of the differential cross shaft. Specifically, the radial thickness of the arc-shaped boss 12 is greatest near the root of the main body 11, gradually decreasing as it extends towards the end of the journal until it smoothly connects with the journal. Because the thickness decreases away from the main body 11, the moment of inertia is effectively controlled, reducing vibration and noise during high-speed rotation and improving the smoothness of the transmission system.

[0037] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A novel differential cross shaft, characterized in that, include: The workpiece (1) includes a main body (11) and a plurality of arc bosses (12), each of the arc bosses (12) being spaced apart on the main body (11) along the circumferential direction; The positioning fixture (2) includes multiple V-grooves (21), each of the V-grooves (21) is spaced apart along the circumferential direction on the positioning fixture (2), and each of the arc bosses (12) abuts against and positions itself with the corresponding V-groove (21).

2. The novel differential cross shaft according to claim 1, characterized in that, The included angles between adjacent circular arc bosses (12) are the same, and the included angles between adjacent V-grooves (21) are the same.

3. The novel differential cross shaft according to claim 1, characterized in that, The main body (11) is columnar and has an assembly hole (13) extending through it in the axial direction; each of the arc bosses (12) is located on one side of the main body (11) in the axial direction.

4. The novel differential cross shaft according to claim 3, characterized in that, The workpiece (1) also includes a plurality of cylindrical portions (14), each of which is spaced apart on the outer ring surface of the main body portion (11) along the circumferential direction.

5. The novel differential cross shaft according to claim 4, characterized in that, Along the vertical direction, the projection of the arc-shaped boss (12) and the projection of the cylindrical part (14) are spaced apart; the included angle between adjacent arc-shaped bosses (12) and cylindrical parts (14) is the same.

6. The novel differential cross shaft according to claim 1, characterized in that, The positioning fixture (2) is rectangular, and the V-groove (21) is located at the four corners of the positioning fixture (2).

7. The novel differential cross shaft according to claim 1, characterized in that, The V-groove (21) includes two inclined surfaces (211) and an arc surface (212). The two inclined surfaces (211) are connected to the arc surface (212) and are symmetrically distributed with the arc surface (212) as the center. The arc boss (12) abuts against both inclined surfaces (211) and the arc surface (212) and the arc boss (12) are spaced apart.

8. The novel differential cross shaft according to claim 1, characterized in that, The side of the workpiece (1) with the arc boss (12) is spaced apart from the side of the positioning fixture (2) with the V-groove (21).

9. The novel differential cross shaft according to claim 1, characterized in that, Along the radial outer side of the main body (11), the inner side of the arc boss (12) is inclined, and along the axial direction away from the main body (11), the radial thickness of the arc boss (12) gradually decreases.

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