A mechanical take-up mechanism and method for gripping a differential assembly

Abstract

The application discloses a mechanical tensioning mechanism and method for grabbing a differential assembly, and relates to the technical field of differential assembly assembly. The mechanism comprises at least one pair of clamping jaws, a tensioning core, a latch and a lifting ring. The clamping jaws clamp the half shaft gear from the inside of the differential assembly. The tensioning core is inserted between the clamping jaws to push them to expand outward. The latch fixes the relative position of the two. The lifting ring is connected to the hoisting equipment. The method comprises the following steps: placing the clamping jaws into the half shaft gear, inserting the tensioning core to make the clamping jaws expand and adhere, fixing the latch, and hoisting operation. The reverse operation is performed when disassembling. The application can avoid assembly interference, realize quick and firm grabbing of the differential assembly, and does not damage the parts, is convenient to disassemble, is suitable for large differentials with a weight of 30 kg or more, and effectively improves the assembly efficiency and safety.

Description

Technical Field

[0001] This invention relates to the field of differential assembly technology, specifically to a mechanical tensioning mechanism and method for gripping differential assemblies. Background Technology

[0002] As a core component of the automotive transmission system, the differential assembly plays a crucial role in distributing power to the left and right drive wheels and allowing them to rotate at different speeds. Its assembly precision directly affects the vehicle's driving stability, transmission efficiency, and service life. In the automotive manufacturing industry, the differential assembly is typically assembled with the main reduction gear to form an integrated transmission unit. Especially in commercial vehicles and heavy machinery, large differential assemblies generally weigh over 30 kg, and some heavy-duty vehicle differential assemblies even exceed 50 kg. This presents significant challenges to handling and positioning during the assembly process.

[0003] Currently, there are still many technical challenges in the assembly of differential assemblies and gearbox housings. Traditional assembly methods mainly rely on manual handling, which is not only labor-intensive but also poses significant efficiency and safety hazards. On the one hand, it is difficult for a single person to independently handle the handling and alignment of heavy differentials, requiring multiple people to work together, which prolongs the assembly cycle and makes it difficult to meet the high-efficiency requirements of modern production lines. On the other hand, during manual operation, the differential assembly is prone to tilting and collisions due to uneven force, resulting in scratches, deformation, or tooth surface damage to precision components such as half-shaft gears and bearings. This can affect transmission accuracy or even cause abnormal noises, oil leaks, and other malfunctions, significantly increasing after-sales maintenance costs.

[0004] Existing mechanical gripping tools have significant limitations in meeting the gripping requirements of differential assemblies. Currently, gripping tools in the industry are mainly divided into three categories: First, external clamping tools, which grip the external structure of the differential housing. However, most differential assemblies have complex structures with no regular force points due to the integration of flanges, bolts, oil seals, and other components. During gripping, they are prone to interference with surrounding parts, leading to housing deformation or seal damage. Second, vacuum suction tools, which rely on the sealing and suction force between the suction cup and the housing surface. However, the surface of the differential housing is often a rough casting, and often contains residual processing coolant or oil, resulting in unstable suction force and a risk of detachment. Third, internal support tools, while avoiding external interference, often use a single tensioning structure with uneven tension distribution. This can easily lead to excessive localized stress on the inner ring of the half-shaft gear, causing plastic deformation, or insufficient tension causing slippage during gripping. Furthermore, some tools require forced separation during disassembly, which can easily scratch the inner ring of the gear. Other gripping tools are generally large in size, complex in structure, and heavy, making them unsuitable for rapid model changeovers and for use in prototype assembly and rework factories.

[0005] In conclusion, designing a mechanical gripping mechanism that can adapt to different specifications of differential assemblies, achieve stable internal tensioning, avoid damage to parts, facilitate disassembly and replacement, and is easy to operate has become a key technological breakthrough for solving differential assembly problems and improving the automation level of production lines. It has important practical significance for reducing production costs, improving product qualification rate, and ensuring production safety. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a mechanical tensioning mechanism and method for gripping differential assemblies. This invention, while avoiding assembly interference and ensuring that tools do not damage the differential assembly, enables rapid and secure gripping of the differential assembly, preventing it from detaching during hoisting and achieving rapid assembly to meet assembly requirements.

[0007] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0008] In a first aspect, the present invention provides a mechanical tensioning mechanism for gripping a differential assembly, comprising:

[0009] At least one pair of pawls for internally gripping the half-shaft gear of the differential assembly;

[0010] An expansion core can be inserted between the pair of claws to push the claws to expand outward;

[0011] A pin is used to fix the relative position of the expansion core and the claw;

[0012] A lifting ring is placed at the top of the expansion core and is used to connect to the lifting equipment.

[0013] As a preferred embodiment of the present invention, the pair of claws has a two-lobed structure and is arranged symmetrically.

[0014] As a preferred embodiment of the present invention, a single pawl includes an insertion portion, a first expansion portion, a second expansion portion, and an outer flange arranged sequentially along the axial direction. The insertion portion has a pin hole for insertion and engagement with the pin. After the outer wall surface of the first expansion portion expands outward, it can fit tightly against the inner wall surface of the half-shaft hole of the differential assembly. After the outer wall surface of the second expansion portion expands outward, it does not contact the inner wall surface of the half-shaft gear. The outer flange can extend into the chamfered area of ​​the inner end of the half-shaft gear and form a limiting engagement relationship with it.

[0015] As a preferred embodiment of the present invention, the thicknesses of the insertion portion, the first expansion portion, and the second expansion portion decrease sequentially.

[0016] As a preferred embodiment of the present invention, the expansion core includes a first core shaft for pushing the first expansion portion to expand outward and a second core shaft for pushing the second expansion portion to expand outward, which are coaxially arranged in sequence. The top of the first core shaft is provided with a lifting interface for installing a lifting ring. The first core shaft is provided with a through hole for engaging with the pin. The diameter of the first core shaft is larger than the diameter of the second core shaft.

[0017] As a preferred embodiment of the present invention, a step is provided on the inner wall of the claw, and the step abuts against the lower surface of the first mandrel to form a limiting fit relationship.

[0018] As a preferred embodiment of the present invention, the claw and the expansion core are fixed together by a pin passing through the pin hole and the through hole.

[0019] In a second aspect, the present invention provides a method for gripping a differential assembly using the aforementioned mechanical tensioning mechanism, comprising the following steps:

[0020] Place the two pawls into the differential half-shaft gear and extend the outer flange into the chamfered area at the inner end of the half-shaft gear;

[0021] Insert the expansion core between the two jaws, causing the jaws to expand outwards and fit tightly against the inner wall of the half-shaft hole;

[0022] Insert the pin to fix the relative position of the expansion core and the chuck;

[0023] The hoisting operation is carried out by connecting the hoisting equipment through the lifting rings.

[0024] As a preferred technical solution of the present invention, the pin holes of the two jaws are aligned and adjusted before inserting the expansion core.

[0025] As a preferred technical solution of the present invention, during disassembly, the pin is first pulled out, then the expansion core is removed, and finally the clasp is taken out.

[0026] The technical solution of this invention, through innovative structural design and operation process, specifically addresses many pain points in the existing differential assembly gripping process. Its technical effects can be analyzed in detail from the following aspects:

[0027] 1. Completely eliminates the drawbacks of manual handling, improving safety and pass rate.

[0028] In traditional differential assembly assembly, heavy components weighing over 30KG rely on manual handling, which is not only labor-intensive but also prone to tilting and collisions due to unstable operation, causing problems such as scratches on the axle gear teeth and deformation of the housing. This invention achieves mechanized gripping and handling of the differential assembly through a combination of a "mechanical tensioning mechanism + lifting equipment": the connection between the lifting ring and the lifting equipment stably supports the heavy differential without direct manual contact, significantly reducing worker labor intensity; during the gripping process, the claws contact the axle holes on the differential assembly's cover plate with surface contact rather than point contact, and the claws do not contact the inner wall of the axle gear, avoiding the risk of bumps during manual handling, significantly improving product qualification rate, and reducing rework costs due to component damage.

[0029] 2. Avoid assembly interference and adapt to complex differential structures.

[0030] Some differential assemblies lack effective clamping points due to the integration of flanges, bolts, oil seals, and other components on the outside, and their complex external structure makes them prone to interference with tools. This invention employs an "internal tensioning" design, fundamentally solving this problem: the pawl extends into the half-shaft hole on the differential assembly's cover plate, and achieves gripping through the first expansion portion fitting against the inner wall of the half-shaft hole, and the outer flange axially limiting the gripping action against the chamfered area of ​​the inner end of the half-shaft gear, completely avoiding external structures; the outer flange extends into the chamfered area of ​​the inner end of the half-shaft gear, contacting only the chamfered area of ​​the half-shaft gear without interfering with any external components. This is particularly suitable for differential assemblies with irregular external force points, expanding the tool's applicability.

[0031] 3. The combination of multi-level tensioning and multi-directional limiting ensures a firm grip and prevents slippage.

[0032] Existing internal support tools often suffer from unstable gripping due to uneven tension. This invention achieves a secure gripping mechanism from all directions (radial and axial) through a layered design: Radial tensioning: The first spindle of the expansion core pushes the first expansion part of the chuck to fit against the inner wall of the half-shaft hole; Axial limiting: After the outer flange extends into the chamfered area of ​​the inner end of the half-shaft gear, it forms an axial abutment with the chamfered area to prevent the differential from slipping axially due to gravity during hoisting; Position fixing: The pin passes through the pin hole of the chuck and the through hole of the expansion core, locking their relative positions to prevent tension failure caused by the expansion core retraction or chuck retraction, ensuring the stability of the differential assembly during hoisting.

[0033] 4. Non-destructive gripping, protecting precision components

[0034] The axle gears and axle bores of the differential are precision-fitted structures, and scratches or deformations can directly affect transmission accuracy. The structural design of this invention fully considers the need for damage-free operation: the first expansion portion of the pawl is an arc-shaped surface adapted to the inner wall of the axle bore, forming surface contact after expansion, resulting in low contact stress and avoiding localized indentations or scratches caused by point contact; the thickness of the pawl's insertion portion, first expansion portion, and second expansion portion decreases sequentially, ensuring that when the first expansion portion is in contact with the inner wall of the axle bore, the outer wall of the second expansion portion does not contact the inner wall of the axle gear (a gap exists), preventing impact to the inner wall of the axle gear and further protecting the precision components inside the differential.

[0035] 5. Easy to operate and adaptable to the high-efficiency requirements of production lines.

[0036] Existing complex gripping tools often affect assembly cycle time due to cumbersome operation. The operation process of this invention is designed to be simple and efficient: Gripping steps: place the gripper → insert the expansion core → insert the pin → hoist, without the need for complicated debugging; Disassembly steps: pull out the pin → remove the expansion core → take out the gripper, the whole process can be completed in a short time, adapting to the fast cycle time requirements of the production line; The alignment adjustment of the gripper pin hole before inserting the expansion core can be achieved by simple tooling, reducing the difficulty of operation. Ordinary workers can operate it proficiently after simple training, reducing the reliance on professional skills.

[0037] 6. High versatility, reducing equipment investment costs

[0038] Different vehicle models have variations in size and gear specifications in their differential assemblies, requiring frequent replacements with traditional custom-made tools, resulting in high costs. This invention improves versatility through modular design: the pawls and expansion cores are the core functional components. By replacing the pawls of different sizes (to fit different half-shaft bores and gear inner diameters) and the expansion cores (to match the pawl sizes), various differential assemblies can be adapted without redesigning the entire mechanism; components such as the lifting rings and pins are standard parts, offering high versatility and reducing spare parts inventory and replacement costs.

[0039] In summary, this invention, through its innovative mechanical tensioning structure and operating method, avoids assembly interference, achieves damage-free gripping, and ensures firmness and stability, while also taking into account ease of operation and versatility. It effectively solves the handling problem in the assembly of heavy-duty differential assemblies, significantly improves production efficiency, product qualification rate, and operational safety, and has important practical application value. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the mechanical tensioning mechanism of the present invention.

[0041] Figure 2 This is a schematic diagram of the expansion core structure of the present invention.

[0042] Figure 3 This is a schematic diagram of the structure of the chuck claw of the present invention.

[0043] Figure 4 This is a cross-sectional structural diagram of an existing differential assembly.

[0044] Figure 5 This is a cross-sectional structural diagram of the mechanical tensioning mechanism and differential assembly of the present invention after assembly.

[0045] Reference numerals: 1. Claw; 101. Insertion part; 102. First expansion part; 103. Second expansion part; 104. Outer flange; 105. Pin hole; 106. Step; 107. Plane; 2. Expansion core; 201. First mandrel; 202. Second mandrel; 203. Through hole; 204. Lifting interface; 3. Pin; 4. Lifting ring; 5. Differential assembly; 501. Half shaft hole; 502. Half shaft gear; 503. Chamfered area. Detailed Implementation

[0046] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present patent. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present patent.

[0047] like Figures 1 to 5 As shown, this embodiment provides a mechanical tensioning mechanism for gripping a differential assembly, including at least a pair of claws 1, a tensioning core 2, a pin 3, and a lifting ring 4. This mechanism achieves a firm gripping of the differential assembly 5 through internal tensioning, and is particularly suitable for large differential assemblies with no external leverage points and a weight of 30KG or more. It can effectively avoid assembly interference and damage to parts, and improve lifting safety and assembly efficiency.

[0048] In this embodiment, the pair of claws 1 adopt a two-lobed symmetrical structure (e.g. Figure 1 As shown, a single chuck 1 is provided with an insertion portion 101, a first expansion portion 102, a second expansion portion 103, and an outer flange 104 arranged sequentially along the axial direction, and the thickness of the three portions decreases sequentially (thickness of insertion portion 101 > thickness of first expansion portion 102 > thickness of second expansion portion 103). The advantage of this design is that the decreasing thickness structure ensures that when the expansion core 2 is inserted, when the first expansion portion 102 is in contact with the inner wall of the half-shaft hole 501, the second expansion portion 103 does not contact the inner wall of the half-shaft gear 502, preventing collision with the half-shaft gear and further protecting the precision components inside the differential.

[0049] Specifically, the insertion part 101 is located at the uppermost part of the claw 1, and its side wall has a pin hole 105 for cooperating with the pin 3 to fix the relative position of the expansion core 2 and the claw 1. The insertion parts 101 of the two claws 1 are joined together to form a hollow structure for the expansion core 2 to be inserted.

[0050] Specifically, the outer wall surface of the first expansion part 102 is an arc-shaped surface that matches the inner wall of the half-shaft hole 501 of the differential assembly 5. When the expansion core 2 pushes it to expand outward, it can completely fit with the inner wall of the half-shaft hole 501 to form radial positioning.

[0051] Specifically, the outer flange 104 is located at the lowest part of the pawl 1, and has an "L"-shaped structure, which can extend into the chamfered area 503 at the inner end of the half-shaft gear 502 (e.g., Figure 4 (As shown). When the pawl 1 expands, the end face of the outer flange 104 abuts against the chamfered area of ​​the inner end of the half-shaft gear 502, forming an axial limit to prevent the differential assembly 5 from axially falling off during hoisting.

[0052] Specifically, the inner wall of the claw 1 is provided with a step 106, which abuts against the lower surface of the first spindle 201 of the expansion core 2, and is used to limit the insertion depth of the expansion core 2 to prevent excessive insertion that would cause the claw 1 to deform beyond the limit.

[0053] Specifically, the inner surfaces of both jaws are machined with planes 107 along the axial direction to reduce interference, increase clearance, and facilitate the insertion of jaw 1 into the differential hole.

[0054] In this embodiment, the expansion core 2 is a stepped shaft structure (such as...). Figure 2 As shown, it includes a first spindle 201 and a second spindle 202 arranged coaxially, wherein the diameter of the first spindle 201 is larger than the diameter of the second spindle 202, and the diameter difference between the two is adapted to the thickness difference between the first expansion portion 102 and the second expansion portion 103 of the chuck 1.

[0055] Specifically, the top of the first mandrel 201 is provided with a lifting interface 204, which is a threaded hole for installing the lifting ring 4; a through hole 203 is provided on the side wall, which is concentrically arranged with the pin hole 105 of the claw 1, for the pin 3 to pass through to fix the expansion core 2 and the claw 1. When the claw 1 is inserted, the first expansion part 102 can be expanded outward by pushing force.

[0056] Specifically, the second spindle 202 is located below the first spindle 201 and is used to push the second expansion portion 103 of the jaw 1 to expand outward, while simultaneously driving the lower outer flange to a predetermined position. The stepped design allows the expansion core 2 to push the jaw 1 to expand in stages, ensuring that the force is evenly distributed at each contact point.

[0057] In this embodiment, the pin 3 is a cylindrical structure with a diameter matching the inner diameter of the pin hole 105 and the through hole 203. After insertion, it can restrict the relative sliding between the expansion core 2 and the claw 1, ensuring a stable tension state. The lifting ring 4 is fixed to the lifting interface 204 by threaded connection or welding. Its load-bearing capacity is not less than 50KG. It is used to connect external lifting equipment (such as cranes or robotic arms) to realize the lifting of the differential assembly 5.

[0058] The mechanical tensioning mechanism of this invention achieves the gripping of the differential assembly 5 through "internal tensioning + multi-directional limiting". The specific operation steps are as follows:

[0059] (1) Preparation stage

[0060] Check if the outer surface of the pawl 1 is smooth (to avoid scratching the inner wall of the differential), and ensure that the pin 3 is not deformed and the lifting ring 4 is securely connected. Join the two pawls 1 together and adjust their relative positions so that the pin holes 105 on both sides are completely aligned (positioning can be assisted by special tooling), in preparation for the subsequent insertion of the pin 3.

[0061] (2) Place the chuck 1

[0062] Holding the assembled chuck 1, insert it into the half-shaft hole 501 of the differential assembly 5 until the end face of the outer flange 104 initially contacts the chamfered area 503 of the inner end of the half-shaft gear 502. At this time, the first expansion portion 102 is located inside the half-shaft hole 501, and the second expansion portion 103 is located within the range of the internal gear ring of the half-shaft gear 502.

[0063] (3) Insert expansion core 2 and achieve tensioning.

[0064] With the second spindle 202 of the expansion core 2 facing downwards, slowly insert it into the hollow part of the two jaws 1. As the expansion core 2 goes deeper: the outer wall of the second spindle 202 first contacts the inner wall of the second expansion part 103 of the jaw 1, pushing the second expansion part 103 to expand outwards. Continue inserting the expansion core 2, and the outer wall of the first spindle 201 contacts the inner wall of the first expansion part 102 of the jaw 1, pushing the first expansion part 102 to expand outwards until it fits against the inner wall of the half-shaft hole 501. When the lower surface of the first spindle 201 of the expansion core 2 abuts against the step 106 of the jaw 1, stop inserting. At this time, the relative position of the expansion core 2 and the jaw 1 reaches the designed tension state.

[0065] (4) Fixing and hoisting

[0066] Insert the pin 3 through the pin hole 105 of the chuck 1 and the through hole 203 of the expansion core 2, ensuring that after full insertion, both ends of the pin 3 are flush with the outer wall of the chuck 1 (to avoid interference from protruding parts during hoisting). Connect the hoisting equipment through the lifting ring 4 and slowly lift the mechanism. At this time: the contact surface between the first expansion part 102 and the half-shaft hole 501 provides radial friction to prevent radial displacement; the outer flange 104 abuts against the chamfered area 503 at the inner end of the half-shaft gear 502 to limit axial displacement. The two work together to ensure that the differential assembly 5 is stable and does not fall off during hoisting.

[0067] (5) Disassembly stage

[0068] Once the differential assembly 5 is transported to its target location (such as the gearbox housing), first pull out the pin 3, then slightly lift the expansion core 2 using a hoisting device to slowly disengage it from the pawl 1. As the expansion core 2 disengages, the pawl 1 loses contact with the inner wall of the differential. Finally, remove the two pawls 1 from the half-shaft hole 501 to complete the entire operation.

[0069] Compared with the prior art, the mechanical tensioning mechanism of this embodiment has the following advantages:

[0070] High safety: It adopts an internal tensioning method to avoid interference with the external structure of the differential, and all contact parts are smooth curved surfaces, which can effectively prevent parts from being scratched.

[0071] Firm grip: Multi-dimensional fixation is achieved through radially expanding friction and axially limiting constraint, ensuring stability even with a weight of over 30KG.

[0072] Easy to operate: No complex control system is required. Tensioning and fixing are achieved through mechanical structure. The assembly and disassembly steps are simple and suitable for quick on-site operations.

[0073] High versatility: By replacing the different sizes of the chuck 1 and expansion core 2, it can be adapted to various models of differential assemblies, reducing equipment investment costs.

[0074] Based on the description and accompanying drawings of this invention, those skilled in the art can readily manufacture or use the mechanical tensioning mechanism and method for gripping a differential assembly according to this invention, and can achieve the positive effects described in this invention.

[0075] Unless otherwise specified, in this invention, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 this invention and 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, the terms used to describe orientation or positional relationships in this invention are for illustrative purposes only and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0076] Unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" in this invention 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 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.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A mechanical tensioning mechanism for gripping a differential assembly, characterized in that, include: At least one pair of pawls (1) for internally clamping the half-shaft gear (502) of the differential assembly (5); An expansion core (2) can be inserted between the pair of claws (1) to push the claws (1) to expand outward; A pin (3) is used to fix the relative position of the expansion core (2) and the claw (1); A lifting ring (4) is set on the top of the expansion core (2) for connecting the lifting equipment; Each of the pawls (1) includes an insertion portion (101), a first expansion portion (102), a second expansion portion (103), and an outer flange (104) arranged sequentially along the axial direction. The insertion portion (101) has a pin hole (105) for insertion and engagement with the pin (3). After the outer wall of the first expansion portion (102) expands outward, it can fit tightly against the inner wall of the half-shaft hole (501) of the differential assembly (5). After the outer wall of the second expansion portion (103) expands outward, it does not contact the inner wall of the half-shaft gear (502). The outer flange (104) can extend into the chamfered area (503) at the inner end of the half-shaft gear (502) and form a limiting engagement relationship with it. The expansion core (2) includes a first core shaft (201) for pushing the first expansion part (102) to expand outward and a second core shaft (202) for pushing the second expansion part (103) to expand outward, which are coaxially arranged in sequence. The top of the first core shaft (201) is provided with a lifting interface (204) for installing the lifting ring (4). The first core shaft (201) is provided with a through hole (203) for inserting and cooperating with the pin (3). The diameter of the first core shaft (201) is larger than the diameter of the second core shaft (202).

2. The mechanical tensioning mechanism according to claim 1, characterized in that, The pair of claws (1) are a two-lobed structure, symmetrically arranged.

3. The mechanical tensioning mechanism according to claim 1, characterized in that, The thickness of the plug-in portion (101), the first expansion portion (102), and the second expansion portion (103) decreases sequentially.

4. The mechanical tensioning mechanism according to claim 1, characterized in that, The inner wall of the claw (1) is provided with a step (106), which abuts against the lower surface of the first mandrel (201) and forms a limiting fit relationship.

5. The mechanical tensioning mechanism according to claim 1, characterized in that, The claw (1) and the expansion core (2) are fixed together by a pin (3) passing through the pin hole (105) and the through hole (203).

6. A method for gripping a differential assembly using a mechanical tensioning mechanism as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Place the two pawls (1) into the differential half-shaft gear (502) and extend the outer flange (104) into the chamfered area (503) at the inner end of the half-shaft gear (502); Insert the expansion core (2) between the two jaws (1) to make the jaws (1) expand outward and fit tightly against the inner wall of the half shaft hole; Insert the pin (3) to fix the relative position of the expansion core (2) and the claw (1); The hoisting equipment is connected through the lifting ring (4) to carry out the hoisting operation.

7. The method according to claim 6, characterized in that, Before inserting the expansion core (2), the pin holes (105) of the two jaws (1) are aligned and adjusted.

8. The method according to claim 6, characterized in that, When disassembling, first pull out the pin (3), then remove the expansion core (2), and finally take out the clasp (1).

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