A tension detection mechanism for differential assembly

Abstract

The present invention discloses a tension detection mechanism for differential assembly, which relates to the technical field of automobile parts, including a fixedly installed frame plate, a lower tension mechanism arranged below the frame plate, and an upper tension mechanism and a driving detection mechanism arranged above the frame plate. The tensioning force of the lower tension mechanism is provided by the lower tension cylinder pushing up the lower tension shaft core to open the lower tension sleeve, and the tensioning force of the upper tension mechanism is provided by the spring pressing down the upper tension shaft core to open the upper tension sleeve. The present invention utilizes the compression reaction force of the spring to provide the tensioning force of the upper tension sleeve, realizes the rapid tensioning of the half-shaft gears with a very simple mechanism, and greatly improves the efficiency of differential detection; during the detection process, the upper clamp and the lower clamp push the upper half-shaft gear and the lower half-shaft gear to a position that fits the differential housing, simulating the actual working conditions of the upper half-shaft gear and the lower half-shaft gear under the centrifugal force, so that the detection data has more evaluation and reference value, which meets the needs of actual production.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive components, and particularly relates to a tensioning mechanism for planetary gears and half-axle gear fork and tightening assembly in a differential. Background Art

[0002] A differential is a mechanism that can output multiple different rotational speeds, and is composed of parts such as planetary gears, a planetary gear carrier (differential housing), and half-axle gears, and is widely used in the automotive field. When the differential works, the power at the input end is first transmitted to the planetary gear carrier to drive the planetary gear carrier to rotate, and then the planetary gear carrier drives each planetary gear to rotate, and the half-axles and half-axle gears respectively connected to each planetary gear output power at different rotational speeds. The quality of the differential assembly directly affects the overall performance of the differential. Therefore, after the differential is assembled, it is necessary to detect the rotational driving force of the differential and the assembly clearance of the differential.

[0003] Both planetary gears of the differential are rotatably installed on the planetary gear carrier (differential housing) and need to mesh with two half-axle gears respectively. In actual production, the assembly of the differential generally adopts an artificial assembly method. The specific process is that the staff sequentially assembles the planetary gear and the half-axle gear. After assembly, the planetary gear and the half-axle gear can be rotated flexibly by hand, that is, the rotational driving force of the differential is detected; subsequently, the staff aligns and marks the two half-shells of the differential housing, tightens the two half-shells with bolts according to the specified tightening torque, and locks them with split pins. After assembly, it should be checked again whether the rotation of the planetary gear and the half-axle gear is flexible, and a feeler gauge is used to measure whether the clearance between the back of the half-axle gear and the differential housing at the measuring window hole on the differential housing meets the assembly requirements, that is, the detection of the differential assembly clearance. The accuracy and stability of this detection method are very poor, and the detection efficiency is also very low. Summary of the Invention

[0004] The present invention precisely aims to avoid the deficiencies of the above-mentioned prior art and provides a tensioning detection mechanism for differential assembly.

[0005] The present invention adopts the following technical solutions to solve the technical problems: A tensioning detection mechanism for differential assembly, including a frame plate, a lower tensioning mechanism provided below the frame plate, an upper tensioning mechanism provided above the frame plate, and a driving and detecting mechanism;

[0006] The driving and detecting mechanism includes a driving shaft with an axis arranged vertically and an angle encoder, and the power input end of the angle encoder is installed and connected to the lower end of the driving shaft;

[0007] The upper tensioning mechanism includes a spring fixing seat, an upper tensioning shaft vertically penetrating through the spring fixing seat, a spring sleeved on the upper tensioning shaft, an upper tensioning shaft core arranged at the bottom end of the upper tensioning shaft, and an upper tensioning sleeve sleeved outside the upper tensioning shaft core; the spring fixing seat is vertically and penetratingly embedded in the frame plate; the power output end of the angle encoder is installed and connected to the top end of the upper tensioning shaft, a limit part of the upper tensioning shaft is arranged at the top end of the upper tensioning shaft, the spring is installed in the spring fixing seat, and its top end and bottom end are axially limited by the limit part of the upper tensioning shaft and the spring fixing seat respectively;

[0008] The lower tensioning mechanism includes a lower tensioning shaft, a lower tensioning shaft core arranged at the top end of the lower tensioning shaft, and a lower tensioning sleeve sleeved outside the lower tensioning shaft core;

[0009] The driving shaft, the upper tensioning shaft and the lower tensioning shaft are coaxially arranged.

[0010] Further, the driving and detecting mechanism further includes a driving shaft mounting plate and at least two guiding and connecting columns. The driving shaft rotatably penetrates and is installed on the driving shaft mounting plate, and the driving shaft mounting plate is connected and fixed above the frame plate through at least two guiding and connecting columns circumferentially and evenly arranged around the driving shaft.

[0011] Further, the upper tensioning mechanism further includes an upper tensioning cylinder installed on the frame plate and an upper pressing plate connected and fixed to the output end of the upper tensioning cylinder; each of the guiding and connecting columns penetrates through the upper pressing plate, and the upper tensioning cylinder is used to drive the upper pressing plate to move up and down under the guiding action of each of the guiding and connecting columns; the upper tensioning shaft core has a generally umbrella-shaped structure with a smaller upper part and a larger lower part, and the upper tensioning sleeve is installed and connected to the bottom of the spring fixing seat.

[0012] Further, the lower tensioning mechanism further includes a fixed lower bottom plate, a lower tensioning cylinder installed on the lower bottom plate, a jacking plate installed and fixed above the lower tensioning cylinder through a lower connecting column, the lower end of the lower tensioning shaft is installed and connected to the output end of the lower tensioning cylinder, the lower tensioning shaft core has a generally umbrella-shaped structure with a larger upper part and a smaller lower part, and the lower tensioning sleeve is installed and connected to the top of the jacking plate.

[0013] Further, it further includes two positioning mechanisms symmetrically installed at the bottom of the frame plate. The positioning mechanism includes a positioning slider slidably and cooperatively connected to a frame plate slide rail provided at the bottom of the frame plate, a positioning upper connecting plate fixedly connected to the positioning slider, a positioning connecting column vertically penetrating through the positioning upper connecting plate, a positioning cylinder fixedly installed at the bottom end of the positioning connecting column through a cylinder bracket, a jaw guiding column with its top end installed and connected to the output end of the positioning cylinder, a positioning lower connecting plate fixedly connected to the bottom end of the jaw guiding column, and an upper jaw and a lower jaw respectively fixedly installed on the cylinder bracket and the positioning lower connecting plate; a connecting column limiting portion is provided at the top end of the positioning connecting column, and the positioning connecting column is hung and installed on the positioning upper connecting plate through the connecting column limiting portion;

[0014] The upper jaws and the lower jaws of the two positioning mechanisms extend towards the opposite sides. The two pairs of upper jaws and lower jaws pass through the gaps between the two planetary gears of the differential, and are respectively inserted between the upper half shaft gear and the lower half shaft gear from both sides of the upper half shaft gear and the lower half shaft gear.

[0015] Further, the outer ends of the two pairs of upper jaws and the lower jaws are cooperatively sleeved on the corresponding jaw guiding columns, and a vertical sliding pair is formed between the two pairs of upper jaws and the lower jaws and the corresponding jaw guiding columns.

[0016] Further, the number of the upper tightening cylinders is at least two, and the driving shafts of the upper tightening cylinders are circumferentially and evenly arranged.

[0017] Further, the spring is a rectangular spring.

[0018] Further, the mating taper of the upper tightening shaft core and the upper tightening sleeve and the lower tightening shaft core and the lower tightening sleeve is greater than 10°.

[0019] Further, the tolerance between the upper tightening sleeve and the lower tightening sleeve and the workpiece to be tightened is not greater than 20 silk.

[0020] The present invention provides a tightening and detecting mechanism for differential assembly, which has the following beneficial effects:

[0021] 1. The present invention uses the compression reaction force of the spring to provide the tightening force for the lower tightening sleeve and the upper tightening sleeve, so that the tightening force of the lower tightening sleeve and the upper tightening sleeve is sufficient to tighten and drive the upper half shaft gear and the lower half shaft gear to rotate, realizing the rapid tightening of the half shaft gear with a very simple mechanism, and greatly improving the efficiency of differential assembly detection at a relatively low cost;

[0022] 2. The positioning mechanism of the present invention can push the upper half-shaft gear and the lower half-shaft gear upward and downward respectively to the position where they are in contact with the differential housing when the tension detection mechanism tightens and positions the upper half-shaft gear and the lower half-shaft gear, so as to restore the working state where the upper half-shaft gear and the lower half-shaft gear are tightly attached to the differential housing under the action of centrifugal force during the operation of the differential, making the data detected by the tension detection mechanism more valuable for evaluation and reference and meeting the needs of actual production;

[0023] 3. The upper tensioning mechanism of the present invention is a spring-type tensioning mechanism. Compared with pneumatic, electric and other tensioning mechanisms that require external energy, it does not need pipeline wiring, has a simple structure, and has low requirements for the working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the present invention.

[0025] In the figure:

[0026] 1. Frame plate, 11. Frame plate slide rail; 2. Driving and detecting mechanism, 21. Guide connecting column, 22. Driving shaft mounting plate, 23. Driving shaft, 24. Angle encoder; 3. Lower tensioning mechanism, 31. Lower bottom plate, 32. Lower tensioning cylinder, 33. Lifting plate, 34. Lower connecting column, 35. Lower tensioning shaft, 36. Lower tensioning shaft core, 37. Lower tensioning sleeve; 4. Upper tensioning mechanism, 41. Upper tensioning cylinder, 42. Upper pressure plate, 43. Spring fixing seat, 44. Spring, 45. Upper tensioning shaft, 46. Upper tensioning shaft core, 47. Upper tensioning sleeve; 5. Positioning mechanism, 51. Positioning slider, 52. Positioning upper connecting plate, 53. Positioning connecting column, 54. Connecting column limiting part, 55. Positioning cylinder, 56. Claw guide column, 57. Positioning lower connecting plate, 58. Upper claw, 59. Lower claw; 6. Differential, 61. Differential housing, 65. Upper pressure block, 66. Lower pressure block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] As Figure 1 shown, the structural relationship is as follows: It includes a fixedly installed frame plate 1, a lower tensioning mechanism 3 arranged below the frame plate 1, an upper tensioning mechanism 4 and a driving and detecting mechanism 2 arranged above the frame plate 1, and a spring fixing seat 43 embedded in the frame plate 1 and penetrating vertically;

[0029] The driving detection mechanism 2 includes a driving shaft mounting plate 22, a driving shaft 23 with its axis arranged vertically, at least two guiding connection columns 21, and an angle encoder 24 whose power input end is mounted and connected to the lower end of the driving shaft 23. The driving shaft 23 passes through the driving shaft mounting plate 22 and is rotationally mounted and connected to the driving shaft mounting plate 22. The driving shaft mounting plate 22 is connected and fixed directly above the frame plate 1 through at least two guiding connection columns 21 evenly distributed circumferentially around the driving shaft 23.

[0030] The upper tensioning mechanism 4 includes an upper tensioning cylinder 41 mounted on the frame plate 1, an upper pressing plate 42 fixedly connected to the output end of the upper tensioning cylinder 41, a spring fixing seat 43, an upper tensioning shaft 45 vertically penetrating through the spring fixing seat 43, a spring 44 sleeved on the upper tensioning shaft 45, an upper tensioning shaft core 46 provided at the bottom end of the upper tensioning shaft 45, and an upper tensioning sleeve 47 sleeved outside the upper tensioning shaft core 46. Each guiding connection column 21 passes through the upper pressing plate 42. The upper tensioning cylinder 41 is used to drive the upper pressing plate 42 to move up and down under the guiding action of each guiding connection column 21. The power output end of the angle encoder 24 is mounted and connected to the top end of the upper tensioning shaft 45. The top end of the upper tensioning shaft 45 is provided with an upper tensioning shaft limiting portion. The spring 44 is mounted in the spring fixing seat 43, and its top end and bottom end are axially limited by the upper tensioning shaft limiting portion and the spring fixing seat 43 respectively. The upper tensioning shaft core 46 has a generally umbrella-shaped structure with a smaller upper part and a larger lower part. The upper tensioning sleeve 47 is mounted and connected to the bottom of the spring fixing seat 43.

[0031] The lower tensioning mechanism 3 includes a fixedly installed lower bottom plate 31, a lower tensioning cylinder 32 mounted on the lower bottom plate 31, a jacking plate 33 installed and fixed above the lower tensioning cylinder 32 through a lower connecting column 34, a lower tensioning shaft 35 whose lower end is mounted and connected to the output end of the lower tensioning cylinder 32, a lower tensioning shaft core 36 provided at the top end of the lower tensioning shaft 35, and a lower tensioning sleeve 37 sleeved outside the lower tensioning shaft core 36. The lower tensioning shaft core 36 has a generally umbrella-shaped structure with a larger upper part and a smaller lower part. The lower tensioning sleeve 37 is mounted and connected to the top of the jacking plate 33.

[0032] The driving shaft 23, the upper tensioning shaft 45, and the lower tensioning shaft 35 are coaxially arranged. The differential housing 61 of the differential 6 is tightly fixed up and down through an upper pressing block 65 installed at the bottom of the positioning slider 51 and a lower pressing block 66 installed at the top of the jacking plate 33. The upper half shaft gear of the differential 6 is sleeved on the upper tensioning shaft core 46 and the upper tensioning sleeve 47, and the lower half shaft gear of the differential 6 is sleeved on the lower tensioning shaft core 36 and the lower tensioning sleeve 37.

[0033] Preferably, it further includes two positioning mechanisms 5 symmetrically installed at the bottom of the frame plate 1. The positioning mechanism 5 includes a positioning slider 51 slidably connected to a frame plate slide rail 11 provided at the bottom of the frame plate 1, a positioning upper connecting plate 52 fixedly connected to the positioning slider 51, a positioning connecting column 53 vertically penetrating the positioning upper connecting plate 52, a positioning cylinder 55 fixedly installed at the bottom end of the positioning connecting column 53 through a cylinder bracket, a jaw guiding column 56 with its top end installed and connected to the output end of the positioning cylinder 55, a positioning lower connecting plate 57 fixedly connected to the bottom end of the jaw guiding column 56, and an upper jaw 58 and a lower jaw 59 respectively fixedly installed on the cylinder bracket and the positioning lower connecting plate 57; a connecting column limiting portion 54 is provided at the top end of the positioning connecting column 53, and it is hung and installed on the positioning upper connecting plate 52 through the connecting column limiting portion 54;

[0034] The upper jaws 58 and the lower jaws 59 of the two positioning mechanisms 5 extend towards the opposite sides. The two pairs of upper jaws 58 and lower jaws 59 pass through the gap between the two planetary gears of the differential 6, and are respectively inserted between the upper half shaft gear and the lower half shaft gear from both sides of the upper half shaft gear and the lower half shaft gear.

[0035] Preferably, the outer ends of the two pairs of upper jaws 58 and lower jaws 59 are sleeved on the corresponding jaw guiding columns 56, and a vertical sliding pair is formed between the two pairs of upper jaws 58 and lower jaws 59 and the corresponding jaw guiding columns 56.

[0036] Preferably, the number of the upper tensioning cylinders 41 is at least two, and they are circumferentially arranged uniformly around the driving shaft 23 of each upper tensioning cylinder 41.

[0037] Preferably, the spring 5 is a rectangular spring.

[0038] Preferably, the mating taper of the upper tensioning shaft core 46 and the upper tensioning sleeve 47 and the lower tensioning shaft core 36 and the lower tensioning sleeve 37 is greater than 10° to prevent self-locking of the upper tensioning shaft core 46 and the upper tensioning sleeve 47 and the lower tensioning shaft core 36 and the lower tensioning sleeve 37 during use; under the condition of ensuring sufficient friction, this mating taper should be as large as possible.

[0039] Preferably, the tolerance between the upper tensioning sleeve 47 and the lower tensioning sleeve 37 and the workpiece to be tensioned is not greater than 20 silk.

[0040] During specific use, it includes the following steps:

[0041] The first step, differential installation

[0042] Place the differential 6 in position. The lower tensioning cylinder 32 and the upper tensioning cylinder 41 drive the lower pressing block 66 and the upper pressing block 65 to move into position, pressing tightly against the differential housing 61. At this time, the upper tensioning shaft core 46 and the upper tensioning sleeve 47, as well as the lower tensioning shaft core 36 and the lower tensioning sleeve 37, extend into the differential 6; the differential housing 61 of the differential 6 is tightly fixed up and down by the upper pressing block 65 installed at the bottom of the positioning slider 51 and the lower pressing block 66 installed at the top of the lifting plate 33; the upper half-shaft gear of the differential 6 is sleeved on the upper tensioning shaft core 46 and the upper tensioning sleeve 47, and the lower half-shaft gear of the differential 6 is sleeved on the lower tensioning shaft core 36 and the lower tensioning sleeve 37;

[0043] In the second step, measure the driving torque

[0044] The upper tensioning cylinder 41 extends into place, and the spring 44 drives the upper tensioning shaft core 46 to move upward, causing the upper tensioning sleeve 47 to deform and expand, tightening the upper half-shaft gear, and providing sufficient friction for the rotation drive of the upper half-shaft gear;

[0045] Subsequently, the drive shaft drives the upper half-shaft gear to rotate through the upper tensioning sleeve 47, and the driving torque is measured and obtained through the torque sensor integrated on the drive shaft;

[0046] In the third step, measure the angular clearance

[0047] The lower tensioning cylinder 32 retracts, driving the lower tensioning shaft core 36 to move downward, causing the lower tensioning sleeve 37 to deform and expand, tightening the lower half-shaft gear, and providing sufficient friction for the rotation drive of the lower half-shaft gear;

[0048] Subsequently, the upper jaw 58 and the lower jaw 59 move upward and downward respectively, pushing the upper half-shaft gear upward and the lower half-shaft gear downward until both the upper half-shaft gear and the lower half-shaft gear are tightly against the differential housing 61 to simulate the working states of the upper half-shaft gear and the lower half-shaft gear under the action of centrifugal force in the actual working condition;

[0049] Then, the drive shaft 23 first drives the upper half-shaft gear to rotate forward into place, the angle encoder 24 records the real-time value A1, and the drive shaft 23 then drives the upper half-shaft gear to rotate backward into place, and the angle encoder 24 records the real-time value A2, and the angular clearance A2 - A1 can be obtained.

[0050] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tension detection mechanism for differential assembly, characterized in that: It includes a frame plate (1), a lower tensioning mechanism (3) arranged below the frame plate (1), an upper tensioning mechanism (4) and a driving and detecting mechanism (2) arranged above the frame plate (1); The driving and detecting mechanism (2) includes a driving shaft (23) with its axis arranged vertically and an angle encoder (24). The power input end of the angle encoder (24) is installed and connected to the lower end of the driving shaft (23); The upper tensioning mechanism (4) includes a spring fixing seat (43), an upper tensioning shaft (45) vertically penetrating through the spring fixing seat (43), a spring (44) sleeved on the upper tensioning shaft (45), an upper tensioning shaft core (46) arranged at the bottom end of the upper tensioning shaft (45), and an upper tensioning sleeve (47) sleeved outside the upper tensioning shaft core (46); The spring fixing seat (43) is vertically and penetratingly embedded in the frame plate (1); The power output end of the angle encoder (24) is installed and connected to the top end of the upper tensioning shaft (45). The top end of the upper tensioning shaft (45) is provided with an upper tensioning shaft limiting part. The spring (44) is installed in the spring fixing seat (43), and its top end and bottom end are axially limited by the upper tensioning shaft limiting part and the spring fixing seat (43) respectively; The lower tensioning mechanism (3) includes a lower tensioning shaft (35), a lower tensioning shaft core (36) arranged at the top end of the lower tensioning shaft (35), and a lower tensioning sleeve (37) sleeved outside the lower tensioning shaft core (36); The driving shaft (23), the upper tensioning shaft (45) and the lower tensioning shaft (35) are coaxially arranged; It further includes two positioning mechanisms (5) symmetrically installed at the bottom of the frame plate (1). The positioning mechanism (5) includes a positioning slider (51) slidably and cooperatively connected with a frame plate slide rail (11) arranged at the bottom of the frame plate (1), a positioning upper connecting plate (52) fixedly connected to the positioning slider (51), a positioning connecting column (53) vertically penetrating through the positioning upper connecting plate (52), a positioning cylinder (55) fixedly installed at the bottom end of the positioning connecting column (53) through a cylinder bracket, a jaw guiding column (56) with its top end installed and connected to the output end of the positioning cylinder (55), a positioning lower connecting plate (57) fixedly connected to the bottom end of the jaw guiding column (56), and an upper jaw (58) and a lower jaw (59) respectively installed and fixed to the cylinder bracket and the positioning lower connecting plate (57); The top end of the positioning connecting column (53) is provided with a connecting column limiting part (54), and is hung and installed on the positioning upper connecting plate (52) through the connecting column limiting part (54); The upper jaws (58) and the lower jaws (59) of the two positioning mechanisms (5) extend towards the opposite sides. The two pairs of upper jaws (58) and lower jaws (59) pass through the gaps between two planetary gears of a differential (6), and are respectively inserted between the upper half shaft gear and the lower half shaft gear from both sides of the upper half shaft gear and the lower half shaft gear; The mating taper of the upper tightening shaft core (46) and the upper tightening sleeve (47), and the lower tightening shaft core (36) and the lower tightening sleeve (37) is greater than 10°.

2. The tension detection mechanism for differential assembly according to claim 1, characterized in that: The driving and detecting mechanism (2) further includes a driving shaft mounting plate (22) and at least two guiding connection columns (21). The driving shaft (23) rotatably penetrates and is mounted on the driving shaft mounting plate (22). The driving shaft mounting plate (22) is connected and fixed above the frame plate (1) through at least two guiding connection columns (21) circumferentially and evenly arranged around the driving shaft (23).

3. The tension detection mechanism for differential assembly according to claim 2, wherein: The upper tightening mechanism (4) further includes an upper tightening cylinder (41) mounted on the frame plate (1), and an upper pressure plate (42) fixedly connected to the output end of the upper tightening cylinder (41). Each of the guiding connection columns (21) penetrates through the upper pressure plate (42). The upper tightening cylinder (41) is used to drive the upper pressure plate (42) to move up and down under the guiding action of each of the guiding connection columns (21). The upper tightening shaft core (46) has a generally umbrella-shaped structure with a smaller upper part and a larger lower part. The upper tightening sleeve (47) is mounted and connected to the bottom of the spring fixing seat (43).

4. The tension detection mechanism for differential assembly according to claim 1, characterized in that: The lower tightening mechanism (3) further includes a fixedly installed lower bottom plate (31), a lower tightening cylinder (32) mounted on the lower bottom plate (31), a jacking plate (33) mounted and fixed above the lower tightening cylinder (32) through a lower connection column (34). The lower end of the lower tightening shaft (35) is mounted and connected to the output end of the lower tightening cylinder (32). The lower tightening shaft core (36) has a generally umbrella-shaped structure with a larger upper part and a smaller lower part. The lower tightening sleeve (37) is mounted and connected to the top of the jacking plate (33).

5. The tension detection mechanism for differential assembly according to claim 1, characterized in that: The outer ends of the two pairs of upper clamping jaws (58) and the lower clamping jaws (59) are cooperatively sleeved on the corresponding clamping jaw guiding columns (56). A vertical sliding pair is formed between the two pairs of upper clamping jaws (58) and the lower clamping jaws (59) and the corresponding clamping jaw guiding columns (56).

6. The tension detection mechanism for differential assembly according to claim 3, characterized in that: The number of the upper tightening cylinders (41) is at least two, and each of the upper tightening cylinders (41) is circumferentially and evenly arranged around the driving shaft (23).

7. The tension detection mechanism for differential assembly according to claim 1, characterized in that: The spring (44) is a rectangular spring.

8. The tension detection mechanism for differential assembly according to claim 1, characterized in that: The tolerance between the upper tightening sleeve (47) and the lower tightening sleeve (37) and the workpiece to be tightened is not greater than 20 silk.

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