CN111604851A - Electric pneumatic adjustable torque wrench - Google Patents

Abstract

The invention relates to an electric power adjustable torque wrench, which is connected with a driving unit and comprises: the wrench shell, the differential external member, the linking member, the limiting disc member, the driving rod and the fine adjustment assembly are arranged, the fine adjustment assembly is arranged, the position of the lock bolt in the upper through hole can be rotated, the compression elastic force of the spring is changed, the peyline is forced to abut against the annular tooth part by the elastic force of the spring, and therefore the limiting disc member can be utilized to be matched with the driving rod to limit the rotation of the differential external member, and the torsion force value which can be driven by the linking member is accurately limited.

Description

Electric pneumatic adjustable torque wrench

Technical Field

The invention relates to an electric-driven adjustable torque wrench, in particular to a technology applied to the field of hand tools.

Background

The use of a torque wrench is one of the most commonly used tools by those in the related art, and among the many types of wrenches, the torque wrench is applied to a detailed operation tool, especially in the assembly of highly precise machines, and the use of the torque wrench can provide a user with an optimum degree of locking for a part without causing the problem of breaking and breaking of the part due to over-head locking, thereby protecting the part and achieving the optimum degree of locking, which is very important for the highly precise machines, such as large machines, e.g., airplanes, automobiles, processing machines, etc.

However, the locking of various parts can be roughly divided into two types, one is a high-torque screw lock, and the other is a low-torque screw lock, wherein the part with torque is very specific, taking precision machinery as an example, and an internal machine is used for maintaining the stability of operation, so that the locking of the parts needs to be locked in a high-torque locking mode, the loosening of the machine in operation can be avoided, and similarly, on the general locking of the parts, the parts with low torque can be used for fixing, and the high-torque parts do not need to be used, so that the cost is reduced; however, the torsional force is the distance of force applied when the material is torsionally deformed, in N · m. When measuring mechanical quantities such as torsional rigidity or torsional modulus of a material, torsion needs to be applied to a test sample when measuring dynamic mechanical properties of the material in a torsional mode. Especially on many measuring instruments for dynamic mechanics, because it is relatively easy to implement a torsion application form of free oscillation or forced oscillation. In another common torque wrench, the torque value is set to be operable, and not only a single torque wrench can operate all parts with different torques, so that the parts must be frequently selected, mechanically applied, queried, etc. to know whether the parts are of the high torque type or the low torque type, and if the high torque part is locked and the torque wrench with the low torque part is used, the wrench is easily damaged, even the appearance of the part is cracked, etc. the torque wrench is damaged. Therefore, the related art needs to consider again how to improve the above-mentioned problems to ensure the integrity between the wrench and the parts in operation.

In view of the above-mentioned deficiencies in the prior art, the present inventors have conducted many studies on related knowledge, compared the advantages and disadvantages, studied and developed related products, and finally developed a "electrically adjustable torque wrench" through many experiments and tests to improve the above-mentioned deficiencies, so as to meet the needs of the public.

Disclosure of Invention

In order to improve the defects that in the prior art, a single torque wrench cannot be suitable for locking each part and can only lock the part with an approximate torque value, so that the part can be separated or the part is damaged due to over-tight locking, the invention provides an electric-driven adjustable torque wrench, and a user can use the most suitable torque wrench for the parts with different torque values and can finely adjust the locking part to the optimal value, thereby protecting the integrity between the torque wrench and the part.

The technical scheme adopted by the invention for solving the technical problems is as follows:

an electrically actuated adjustable torque wrench, which is linked to a drive unit, comprising: a wrench shell, which is provided with a containing hole penetrating through the wrench shell, and the side edge of the wrench shell is further provided with an upper through hole and a lower through hole which are both communicated with the containing hole; the differential sleeve is arranged in the accommodating hole; one end of the connecting piece penetrates through the accommodating hole of the wrench shell, and the other end of the connecting piece is connected with the differential kit for driving; the limiting disc piece is arranged in the containing hole and has the same horizontal height with the upper through hole, the limiting disc piece further comprises a ring tooth part and a group of holes, the group of holes penetrate through the limiting disc piece, the ring tooth part is annularly arranged on the periphery of the limiting disc piece, the limiting disc piece is combined at one end of the differential sleeve piece through the group of holes, and a plurality of abutting grooves are annularly arranged on the periphery of the ring tooth part; one end of the driving rod is inserted from the lower through hole and is meshed with the differential sleeve, and the other end of the driving rod is connected with the driving unit; the fine adjustment component is arranged in an upper through hole of the wrench shell and comprises a bearing, a column block, a spring and a lock bolt, the lock bolt is locked in the upper through hole and moves in an internal spiral mode, the column block is further provided with a slot corresponding to the limiting disc piece, the bearing is inserted into the slot and penetrates through the column block and the bearing by a bolt, the bearing pivots in the slot by taking the bolt as an axis, the bearing is normally embedded and clamped in any one of a plurality of abutting slots of the annular tooth part, the spring is arranged between the column block and the lock bolt, and two ends of the spring are elastically abutted to the lock bolt and the column block; under the arrangement of the fine adjustment assembly, the position of the bolt in the upper through hole can be screwed to change the compression elasticity of the spring, so that the peyline is forced to abut against the annular tooth part by the elasticity of the spring, the limiting disc piece can be utilized to be matched with the driving rod to limit the rotation of the differential sleeve piece, and the torsion force value which can be driven by the connecting piece can be accurately limited.

It is two then an electro-pneumatic adjustable torque wrench, it links with drive unit, and it includes: a wrench shell, which is provided with a containing hole penetrating through the wrench shell, and the side edge of the wrench shell is further provided with an upper through hole and a lower through hole which are both communicated with the containing hole; the differential sleeve is arranged in the accommodating hole; one end of the connecting piece penetrates through the accommodating hole of the wrench shell, and the other end of the connecting piece is connected with the differential kit for driving; a limiting disk piece, which is arranged in the containing hole and has the same horizontal height with the upper through hole, and the limiting disk piece further comprises a pawl part and an action part, the periphery of the action part is further annularly concave with a plurality of abutting grooves, a plurality of fluted discs are arranged around the pawl part and are mutually meshed, a planet carrier is also arranged, the top surface of the planet carrier is convexly provided with a plurality of positioning columns, the limiting disk piece and the plurality of fluted discs are all inserted and assembled in each positioning column of the planet carrier, the bottom surface of the planet carrier is convexly provided with a connecting column to assemble the differential external member, in addition, a tooth ring piece is further arranged to be sleeved on the periphery of the plurality of fluted discs, and each composite fluted disc is mutually meshed with the tooth ring piece; one end of the driving rod is inserted from the lower through hole and is meshed with the differential sleeve, and the other end of the driving rod is connected with the driving unit; and a fine-tuning component, it is installed in an upper perforation of the spanner shell, the fine-tuning component includes a bearing, a column block, a spring and a lock plunger, the lock plunger is locked in the upper perforation and rotates and moves in the internal screw, and the column block is further dissected and equipped with a slot corresponding to the spacing disk piece, and the bearing is inserted in the slot and runs through the column block and the bearing with a bolt, the bearing pivots in the slot with the bolt as the axle center, and the bearing is inserted in any one of several bearing slots of the actuating part in the normal state, and the spring is installed between the column block and the lock plunger, and both ends of the spring are sprung against the lock plunger and the column block; under the arrangement of the fine adjustment assembly, the position of the bolt in the upper through hole can be screwed to change the compression elasticity of the spring, so that the peyline is forced to abut against the acting part by the elasticity of the spring, and the tooth number meshing difference between the pawl part and each fluted disc is utilized, so that the limiting disc piece can be utilized to be matched with the driving rod to limit the rotation of the differential sleeve piece, and the torsion force value which can be driven by the connecting piece is further accurately limited.

The invention has the advantages that a user can use the most suitable torque wrench to operate aiming at parts with different torque forces, and can finely adjust to the best value to set the locking part, thereby protecting the integrity between the torque wrench and the part.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a perspective view illustrating a first embodiment of the present invention.

Fig. 2 is an exploded perspective view of the first embodiment of the present invention.

FIG. 3 is a schematic sectional view of the III-III line shown in FIG. 1.

FIG. 4 is a schematic diagram of the operation of the rotation adjustment trimming assembly shown in FIG. 3.

FIG. 5 is a cross-sectional view of the V-V line shown in FIG. 1.

FIG. 6 is a schematic diagram of the operation of the rotational adjustment trimming assembly shown in FIG. 5.

Fig. 7 is a perspective view illustrating a second embodiment of the present invention.

Fig. 8 is an exploded perspective view of a second embodiment of the present invention.

FIG. 9 is a cross-sectional view of IX-IX shown in FIG. 7.

FIG. 10 is a schematic diagram of the operation of the rotational adjustment trimming assembly shown in FIG. 9.

The reference numbers in the figures illustrate:

wrench shell 1 containing hole 11

Upper perforation 12 and lower perforation 13

Upper cover 14 interlayer 15

Base 16 arc groove 17

Screw 18 differential kit 2

Pipe sleeve 21 combined hole 211

Toothed shaft 22 toothed kit 23

An upper disc part 232 of the engagement hole 231

Upper teeth row 234 of lower disk part 233

Axial center group 25 of conical tooth 24

Engaging end 251 engaging member 3

Annular tooth part 41 of limiting disc 4

The group hole 42 abuts against the groove 43

Peak 44 and crest 45

Actuating part 47 of detent part 46

Drive rod 5 side tooth 51

Fine adjustment assembly 6 bearings 61

Post block 62 slot 621

Spring 63 latch 64

Lower bearing 7 of bolt 65

Upper bearing 81 of cover member 8

Upper pipe portion 82 and lower pipe portion 83

Planetary carrier 10 of fluted disc 9

Positioning post 101 and binding post 102

Tooth ring piece 20

Detailed Description

In order to clearly illustrate the above objects and functions of the present invention, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. Referring to fig. 1 to 6, a first embodiment of the present invention is an electrically-driven adjustable torque wrench, which is connected to a driving unit (not shown) driven by electricity or air, and includes: a wrench shell 1, which is provided with a containing hole 11 penetrating from the top surface to the bottom surface of the wrench shell 1, and the side of the wrench shell 1 is further provided with an upper through hole 12 and a lower through hole 13 both communicated with the containing hole 11; a differential sleeve 2 arranged in the containing hole 11; one end of the connecting piece 3 is inserted into the receiving hole 11 of the wrench housing 1 and is assembled by related parts such as a sleeve (not shown), and the other end of the connecting piece 3 is connected with the differential sleeve 2 for driving; a limiting disk 4, which is installed in the containing hole 11 and has the same horizontal height as the upper through hole 12, and the limiting disk 4 further comprises a ring gear 41 and a group of holes 42, the group of holes 42 penetrates the limiting disk 4 and is polygonal, the ring gear 41 is annularly arranged on the periphery of the limiting disk 4, the limiting disk 4 is combined with one end of the differential kit 2 through the group of holes 42, and the periphery of the ring gear 41 is annularly provided with a plurality of abutting grooves 43; a driving rod 5 in the shape of a long rod, one end of which is inserted through the lower through hole 13 and is provided with a side tooth 51 to be meshed with the differential assembly 2, and the other end of the driving rod 5 is linked with a driving unit; and a fine-tuning assembly 6, it is loaded in a upper perforation 12 of the spanner housing 1, the fine-tuning assembly 6 includes a peigner 61, a column block 62, a spring 63 and a locking bolt 64, the locking bolt 64 is locked in the upper perforation 12 and rotated and displaced inside, and the column block 62 is further dissected and equipped with a slot 621 corresponding to the spacing disc member 4, the dissected direction of the slot 621 is longitudinal dissected, and the peigner 61 is inserted horizontally in the slot 621 and runs through the column block 62 and the peigner 61 with a stud 65, make the peigner 61 pivot in the slot 621 with stud 65 as axle center, and the peigner 61 is inserted in the slot 621 in the several abutting groove 43 of the ring tooth part 41 in normal state, and the spring 63 is set up between column block 62 and locking bolt 64, and both ends of the spring 63 are abutted against the locking bolt 64 and column block 62; with the fine adjustment assembly 6, the position of the locking bolt 64 in the upper through hole 12 can be screwed to change the compression elasticity of the spring 63, so that the pellin 61 is forced to abut against the annular tooth portion 41 by the elasticity of the spring 63, and thus the limiting disc member 4 can be used to cooperate with the driving rod 5 to limit the rotation of the differential sleeve member 2, and further the torsion force value which can be driven by the connecting member 3 can be precisely limited.

According to the above description, when the user wants to lock the low torque part, in addition to the driving unit, the driving rod 5 is limited to pivot by the setting driving, and the driving rod 5 is limited to limit the basic pivoting torque of the connecting member 3 by the setting of the differential assembly 2, however, if the torque value needs to be further finely set, only the locking force of the locking bolt 64 pushes the spring 63 to compress, the spring 63 pushes the column block 62 to push the bearing block 61 to be embedded and clamped in the abutting groove 43, and because the limiting disc 4 is engaged with the differential assembly 2, therefore, the set torque value can be further finely adjusted under the limitation of the limiting disc 4, so that the torque value originally set by the driving rod 5 and the driving unit is more accurate, and the locking of the parts with low torque can be matched, and the defect of breakage cannot be easily caused.

In addition, when the torque force generated when driving the component is greater than the set torque force value, in order to prevent the sleeve from continuously driving the component to cause damage, on the design of the slot wall of each abutting slot 43, the ring gear 41 of the limiting disc member 4 is triangular, and at least two abutting slots 43 are arranged on three sides of the ring gear 41, a peak 44 is formed between at least two abutting slots 43 on the same side in a protruding manner, a peak 45 is formed between any two abutting slots 43 on two adjacent sides, the pellin 61 is embedded in any abutting slot 43 of the at least two abutting slots 43 on the same side when the lock bolt 64 is locked in a pressing manner towards the spring 63, and when the torque force driven by the connecting member 3 is less than the elastic abutting force of the spring 63, the limiting disc member 4 is gradually rotated to make the pellin 61 jump in the at least two abutting slots 43 on the same side, so that when the lock bolt 64 abuts against the spring 63, the torque force generated when the connecting member 3 drives the component to lock is not greater than the spring 63 indirectly When the elastic force of the propping groove 43 of the propping forest 61 and the torsion setting between the driving rod 5 and the driving unit are added, the limiting disk 4 will not rotate, if the torque of the driving part of the connecting piece 3 is larger than the torque setting between the driving rod 5 and the driving unit, and the spring 63 indirectly pushes the bearing cylinder 61 against the elastic force of the groove 43, the limiting disc 4 is gradually rotated, the bearing groove 43 of the current embedded clamp of the bearing disc 61 is gradually displaced and close to the crest 45, the bearing disc 4 rotates to enable the bearing disc 61 to jump to the bearing groove 43 on the other side, in short, the limiting disc 4 pushes the bearing disc 61 to drive the column block 62 to compress towards the spring 63 by the crest 45, so that the bearing disc 61 jumps to the other side of the annular tooth part 41, the state is an idle running state, and the sleeve and the part can be protected without damage to the part due to excessive driving of the sleeve.

According to the above description, it is clear that the practical usage of the first embodiment of the present invention is described, and the detailed technical features thereof are described, first, the wrench case 1 of the present invention further includes an upper cover 14, an interlayer 15 and a base 16, the upper cover 14, the interlayer 15 and the base 16 are all in a convex shape, the interlayer 15 is sandwiched between the upper cover 14 and the base 16, the accommodating hole 11 is formed by mutually overlapping the upper cover 14, the interlayer 15 and the base 16, the upper through hole 12 is formed by respectively recessing an arc groove 17 on the upper cover 14 and the interlayer 15, and a plurality of screws 18 penetrate through the upper cover 14 and the interlayer 15 and are locked on the base 16, so that when a user performs an initial setting by a torque wrench, the torque bearing force between the driving rod 5 and the differential sleeve 2 can be determined by the control setting of the driving unit, and then the receiver can perform a fine torque setting by adjusting the torque fine tuning assembly 6, in this way, the engaging member 3 sleeved with the sleeve can perform the finest torque driving on the component to be locked, as shown in fig. 4, 5 and 6.

In addition, the detailed discussion of the differential kit 2 is provided, the differential kit 2 further includes a cylindrical pipe sleeve 21, a gear shaft rod 22, a gear kit 23, a plurality of conical gear members 24 and a shaft center group 25, the pipe sleeve 21 penetrates through a combination hole 211, the shaft center group 25 is provided with the same number of joint ends 251 corresponding to the conical gear members 24, each conical gear member 24 is assembled with each joint end 251 of the shaft center group 25, and the shaft center group 25 and each conical gear member 24 are accommodated in the combination hole 211, the shaft center group 25 of the present invention is assembled with two support shaft members in a staggered manner to form a cross shape and is clamped with the hole wall of the combination hole 211 of the pipe sleeve 21, one end of the gear shaft rod 22 is engaged with the conical gear members 24, the other end of the gear shaft rod 22 is polygonal and penetrates through the group hole 42 of the limiting disc member 4 and is clamped and linked with each other, the gear kit 23 penetrates through a joint hole 231 which is also polygonal and further includes an upper disc portion 232 and a lower disc portion 233, the top of the gear set 23 is provided with an upper gear row 234 which is engaged with the driving rod 5 in a radial shape, the upper gear row 234 is arranged on the top surface of the upper disk part 232 in a surrounding manner, the lower disk part 233 is arranged on the bottom surface of the upper disk part 232, a lower bearing 7 is arranged on the lower disk part 233 in a surrounding manner and is clamped in the accommodating hole 11, one end of the connecting piece 3 is polygonal and passes through the joint hole 231 to be engaged with each other, the connecting piece 3 passes through the joint hole 231 to be exposed out of the wrench shell 1, and the other end of the connecting piece 3 is engaged with each conical gear piece 24; in addition, in order to prevent the plurality of conical tooth elements 24 and the shaft center group 25 from separating from the pipe sleeve 21 in the operation process, a cover element 8 is further arranged to cover the pipe sleeve 21 and overlap with the limiting disk element 4, and the cover element 8 covers the pipe sleeve 21 and shields the plurality of conical tooth elements 24 and the shaft center group 25, thereby being capable of reliably preventing the plurality of conical tooth elements 24 and the shaft center group 25 from separating and keeping driving smooth, an upper bearing 81 is further arranged between the cover element 8 and the limiting disk element 4, the cover element 8 comprises an upper pipe part 82 and a lower pipe part 83, the pipe diameter of the upper pipe part 82 is smaller than that of the lower pipe part 83, and the upper bearing 81 is sleeved on the upper pipe part 82 and abuts against the lower pipe part 83, so that the operation between the limiting disk element 4 and the shaft center group 8 can not be limited and blocked mutually, please refer to fig. 2; the application of the differential assembly 2 is the same as that of a differential, and the engagement of the driving rod 5 engaged with the upper gear row 234, the gear shaft rod 22 and the connecting piece 3 with the plurality of conical gear pieces 24 engaged up and down can change, adjust and more finely set the sleeve sleeved on the connecting piece 3 to drive the locking of the part, so that the part can achieve the optimal locking tightness, and more importantly, the part and the sleeve cannot be damaged.

The second embodiment of the present invention is different from the first embodiment in that the second embodiment is used for locking a high-torque part, and therefore the second embodiment is different from the first embodiment in that the second embodiment is a portion of the limiting disc 4, the second embodiment of the present invention is that the limiting disc 4 is further divided into a tooth pulling portion 46 and an actuating portion 47, a plurality of abutting grooves 43 are disposed on the periphery of the actuating portion 47, a plurality of toothed discs 9 are disposed around the tooth pulling portion 46 and engaged with each other, a planet carrier 10 is further provided with a plurality of positioning pillars 101 protruding from the top surface thereof, wherein one positioning pillar 101 is disposed at the central position of the planet carrier 10, the remaining positioning pillars 101 surround the central positioning pillars 101 and form a triangular three-point arrangement, the limiting disc 4 and the plurality of toothed discs 9 are inserted and assembled in each positioning pillar 101 of the planet carrier 10, a combining pillar 102 is protruding from the bottom surface of the planet carrier 10 and connected to the differential external member 2, and a toothed ring 20 is further disposed around the plurality of the toothed discs 9, the multiple toothed discs 9 are engaged with the toothed ring 20, and the fine adjustment assembly 6 is configured to screw the position of the latch 64 in the upper through hole 12 to change the compression elastic force of the spring 63, so that the peyline 61 is forced to abut against the actuating portion 47 by the elastic force of the spring 63, and the tooth number engagement difference between the pawl portion 46 and each toothed disc 9 is utilized, so that the limiting disc 4 can be utilized to cooperate with the driving rod 5 to limit the rotation of the differential assembly 2, and the connecting member 3 controls the sleeve lock component to bear a higher torque force under the torque force setting of the limiting disc 4 and the original torque force setting between the driving rod 5 and the driving unit, as shown in fig. 7 to 10.

Finally, summarizing the above description of the two embodiments of the present invention, through the cooperation between the torque wrench and the differential kit 2, and the setting of the fine tuning assembly 6 and the limiting disc 4 of the two embodiments, enables the torque between the driving unit and the driving rod 5 to be further precisely set to match the parts with various torque requirements for locking operation, so that the parts and the sleeve are not over-driven by the torque wrench to collapse, thereby protecting the use of the sleeve and the parts, improving the problem that the existing torque wrench can only set approximate values in torque setting, cannot set finer torque values, cannot lock the parts to an optimal degree, and is easy to loosen the parts, and completely improving the existing problems, and has substantially certain advancement and practicability.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.

Claims (12)

1. The utility model provides an electro-pneumatic adjustable torque wrench, its and drive unit are linked, its characterized in that includes:

a wrench shell, which is provided with a containing hole penetrating through the wrench shell, and the side edge of the wrench shell is further provided with an upper through hole and a lower through hole which are both communicated with the containing hole;

the differential sleeve is arranged in the accommodating hole;

one end of the connecting piece penetrates through the accommodating hole of the wrench shell, and the other end of the connecting piece is connected with the differential kit for driving;

the limiting disc piece is arranged in the containing hole and has the same horizontal height with the upper through hole, the limiting disc piece further comprises a ring tooth part and a group of holes, the group of holes penetrate through the limiting disc piece, the ring tooth part is annularly arranged on the periphery of the limiting disc piece, the limiting disc piece is combined at one end of the differential sleeve piece through the group of holes, and a plurality of abutting grooves are annularly arranged on the periphery of the ring tooth part;

one end of the driving rod is inserted from the lower through hole and is meshed with the differential sleeve, and the other end of the driving rod is connected with the driving unit;

the fine adjustment component is arranged in an upper through hole of the wrench shell and comprises a bearing, a column block, a spring and a lock bolt, the lock bolt is locked in the upper through hole and moves in an internal spiral mode, the column block is further provided with a slot corresponding to the limiting disc piece, the bearing is inserted into the slot and penetrates through the column block and the bearing by a bolt, the bearing pivots in the slot by taking the bolt as an axis, the bearing is normally embedded and clamped in any one of a plurality of abutting slots of the annular tooth part, the spring is arranged between the column block and the lock bolt, and two ends of the spring are elastically abutted to the lock bolt and the column block;

under the arrangement of the fine adjustment assembly, the position of the bolt in the upper through hole can be screwed to change the compression elasticity of the spring, so that the peyline is forced to abut against the annular tooth part by the elasticity of the spring, the limiting disc piece can be utilized to be matched with the driving rod to limit the rotation of the differential sleeve piece, and the torsion force value which can be driven by the connecting piece can be accurately limited.

2. The electrically driven adjustable torque wrench as claimed in claim 1, wherein the wrench housing further comprises a top cover, an interlayer and a base, the interlayer is sandwiched between the top cover and the base, the receiving hole penetrates the top cover, the interlayer and the base, the top through hole is formed by a plurality of arc slots respectively recessed in the top cover and the interlayer, and a plurality of screws penetrate the top cover and the interlayer and are locked to the base; in addition, the lower through hole is independently arranged on the base and communicated with the containing hole.

3. The electrically driven adjustable torque wrench as claimed in claim 2, wherein the differential assembly further includes a sleeve, a gear shaft, a gear assembly, a plurality of tapered teeth, and a shaft assembly, the sleeve passing through a combination hole, the shaft assembly having a same number of engagement ends corresponding to the plurality of tapered teeth, each tapered teeth being assembled to each engagement end of the shaft assembly and received in the combination hole, one end of the gear shaft engaging with the plurality of tapered teeth, the other end of the gear shaft passing through the group hole of the limiting plate and engaging with each other, the gear assembly passing through an engagement hole, one end of the engagement member passing through the engagement hole and exposed to the wrench housing, the other end engaging with each tapered teeth, the engagement member engaging with the engagement hole, and an upper row of teeth engaging with the driving rod.

4. The electrically adjustable torque wrench as claimed in claim 3, further comprising a cover member covering the socket and overlapping the limiting plate member, the cover member covering the socket and covering the plurality of tapered teeth and the plurality of axial centers, an upper bearing disposed between the cover member and the limiting plate member and engaging the receiving hole, and a lower tube portion disposed between the upper tube portion and the lower tube portion, the upper bearing being disposed on the upper tube portion and abutting against the lower tube portion.

5. The electrically driven adjustable torque wrench as claimed in claim 4, wherein the gear assembly further includes an upper disk portion and a lower disk portion, the upper gear row is disposed on the top surface of the upper disk portion, the lower disk portion is disposed on the bottom surface of the upper disk portion, and a lower bearing is disposed on the lower disk portion and is engaged with the receiving hole.

6. An electro-pneumatic adjustable torque wrench as claimed in any one of claims 1 to 5, characterised in that the ring gear of the limiting disc is triangular-like, and three sides of the ring tooth part are provided with at least two abutting grooves, a peak part is convexly formed between the at least two abutting grooves on the same side, a peak part is formed between the abutting grooves at any two adjacent sides, and the lock bolt pushes the column block when being screwed and pressed towards the spring direction, the column block pushes the bearing block to be clamped on at least two abutting grooves on any side of the ring tooth part, and when the torsion driven by the connecting piece is larger than the elastic abutting force of the spring, the limiting disc part pushes the bearing to drive the column block to compress towards the spring by the peak top part, so that the bearing jumps to the other side of the ring tooth part to form idle rotation, when the torsion force driven by the connecting piece is smaller than the elastic force of the spring, the bearing is bounced between the at least two abutting grooves on the same side.

7. The utility model provides an electro-pneumatic adjustable torque wrench, its and drive unit are linked, its characterized in that includes:

a wrench shell, which is provided with a containing hole penetrating through the wrench shell, and the side edge of the wrench shell is further provided with an upper through hole and a lower through hole which are both communicated with the containing hole;

the differential sleeve is arranged in the accommodating hole;

one end of the connecting piece penetrates through the accommodating hole of the wrench shell, and the other end of the connecting piece is connected with the differential kit for driving;

a limit disk piece, which is arranged in the containing hole and has the same horizontal height with the upper through hole, and the limit disk piece further comprises a pawl part and an action part, the periphery of the action part is further annularly concave with a plurality of abutting grooves, a plurality of fluted discs are arranged around the pawl part and are mutually meshed, a planet carrier is arranged with a plurality of positioning columns on the top surface in a protruding way, the limit disk piece and the plurality of fluted discs are all inserted and assembled in each positioning column of the planet carrier, the bottom surface of the planet carrier is convexly provided with a connecting column assembling differential external member, a tooth ring piece is further arranged on the periphery of the plurality of fluted discs and is clamped and assembled in the containing hole, and each composite fluted disc is mutually meshed with the tooth ring piece;

one end of the driving rod is inserted from the lower through hole and is meshed with the differential sleeve, and the other end of the driving rod is connected with the driving unit;

and a fine-tuning component, it is installed in an upper perforation of the spanner shell, the fine-tuning component includes a bearing, a column block, a spring and a lock plunger, the lock plunger is locked in the upper perforation and rotates and moves in the internal screw, and the column block is further dissected and equipped with a slot corresponding to the spacing disk piece, and the bearing is inserted in the slot and runs through the column block and the bearing with a bolt, the bearing pivots in the slot with the bolt as the axle center, and the bearing is inserted in any one of several resisting slots of the actuating part in the normal state, and the spring is installed between the column block and the lock plunger, and the two ends of the spring are sprung against the lock plunger and the column block;

under the arrangement of the fine adjustment assembly, the position of the bolt in the upper through hole can be screwed to change the compression elasticity of the spring, so that the peyline is forced to abut against the acting part by the elasticity of the spring, and the tooth number meshing difference between the pawl part and each fluted disc is utilized, so that the limiting disc piece can be utilized to be matched with the driving rod to limit the rotation of the differential sleeve piece, and the torsion force value which can be driven by the connecting piece is further accurately limited.

8. The electrically driven adjustable torque wrench as claimed in claim 7, wherein the wrench housing further comprises a top cover, an interlayer and a base, the interlayer is sandwiched between the top cover and the base, the receiving hole penetrates the top cover, the interlayer and the base, the top through hole is formed by a plurality of arc slots respectively recessed in the top cover and the interlayer, and a plurality of screws penetrate the top cover and the interlayer and are locked to the base; in addition, the lower through hole is independently arranged on the base and communicated with the containing hole.

9. The electrically driven adjustable torque wrench as claimed in claim 8, wherein the differential assembly includes a sleeve, a gear shaft, a gear assembly, a plurality of tapered teeth, and a shaft assembly, the sleeve passes through a combining hole, the shaft assembly has the same number of engaging ends corresponding to the plurality of tapered teeth, each tapered teeth is connected to each engaging end of the shaft assembly and received in the combining hole, one end of the gear shaft is engaged with the plurality of tapered teeth, the other end of the gear shaft is engaged with the engaging post of the carrier, the gear assembly has an engaging hole, one end of the engaging member passes through the engaging hole and is exposed to the wrench housing, the other end of the engaging member is engaged with the tapered teeth, the engaging member and the engaging hole are engaged with each other, and the top of the gear assembly has an upper gear row engaged with the driving rod.

10. The electrically adjustable torque wrench as claimed in claim 9, further comprising a cover member covering the socket and overlapping the planet carrier, the cover member covering the socket and covering the plurality of tapered teeth and the plurality of axial center sets, an upper bearing disposed between the cover member and the limiting plate and engaged with the receiving hole, and a lower tube portion disposed between the upper tube portion and the limiting plate, the upper tube portion having a smaller diameter than the lower tube portion, and the upper bearing being disposed on the upper tube portion and abutting against the lower tube portion.

11. The electrically driven adjustable torque wrench as claimed in claim 10, wherein the gear assembly further includes an upper disk portion and a lower disk portion, the upper gear row is disposed on the top surface of the upper disk portion, the lower disk portion is disposed on the bottom surface of the upper disk portion, and a lower bearing is disposed on the lower disk portion and engaged with the receiving hole.

12. An electro-pneumatic adjustable torque wrench according to any one of claims 7 to 11, it is characterized in that the action part of the limiting disc part is triangular, at least two abutting grooves are arranged on three sides of the action part, a peak part is convexly formed between the at least two abutting grooves on the same side, a peak part is formed between the abutting grooves at any two adjacent sides, and the lock bolt pushes the column block when being screwed and pressed towards the spring direction, the column block pushes the bearing block to be clamped on at least two abutting grooves on any side of the actuating part, and when the torsion force driven by the connecting piece is larger than the elastic abutting force of the spring, the limiting disk part pushes the bearing to drive the column block to compress towards the spring by the peak top part, so that the bearing jumps to the other side of the actuating part to form idle rotation, when the torsion force driven by the connecting piece is smaller than the elastic force of the spring, the bearing is bounced between the at least two abutting grooves on the same side.

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