CN217177298U

CN217177298U - Automatic double-speed torque wrench

Info

Publication number: CN217177298U
Application number: CN202220207077.6U
Authority: CN
Inventors: 王国富
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-08-12
Anticipated expiration: 2032-01-25

Abstract

The utility model discloses an automatic double speed torque wrench, include: a housing assembly; the planet gear assembly comprises a power transmission part, a low-speed gear adjusting part and a high-speed gear adjusting part which are connected; one end of the power input part extends into the shell assembly and is meshed with the power transmission part for transmission; one end of the power output part extends into the shell assembly and is meshed with the power transmission part for transmission; the high-speed gear ring is rotationally arranged in the shell assembly and is meshed with the high-speed gear adjusting part; the low-speed gear ring is rotationally arranged in the shell assembly and is meshed with the low-speed gear adjusting part; the gear adjusting component is matched with the shell assembly to change the limit and fix of the high-speed gear ring or the low-speed gear ring through a preset torque value; compared with the prior art, the utility model, work efficiency is higher.

Description

Automatic double-speed torque wrench

Technical Field

The utility model relates to a torque wrench technical field, concretely relates to automatic double speed torque wrench.

Background

Electric torque wrenches are commonly used for the assembly and disassembly of screw nuts, particularly for the assembly of screw nuts with torque accuracy requirements.

For example, patent document with application number CN201821223432.9 discloses an electric torque increasing wrench, which includes a wrench housing, a driving device, an input shaft, an output shaft and a torque increasing device, wherein the input shaft and the output shaft are coaxially installed in the wrench housing through the torque increasing device, one end of the input shaft is fixedly connected with an output end of the driving device outside one end of the wrench housing, and one end of the output shaft extends out from the other end of the wrench housing; the outside of the wrench shell is provided with a handle.

The multi-stage speed reduction is carried out through a multi-stage star gear transmission mechanism and a bearing in the torque increasing device so as to increase the torque, but in the actual work, a screw nut can be screwed without large torque at the beginning in the fastening process, and large torque force is needed only when the resistance of the last circles is large; however, the wrench in the above patent documents has a problem of low working efficiency because the screw nut is fastened by a low-speed high-torque method.

SUMMERY OF THE UTILITY MODEL

To exist not enough among the prior art, the utility model aims to provide an automatic double speed torque wrench to solve among the prior art, the spanner is fastened screw nut with the mode of low-speed high moment of torsion always, has the problem that work efficiency is low.

In order to achieve the above purpose, the utility model adopts the following technical scheme: an automated two-speed torque wrench, comprising:

a housing assembly;

the multi-connected planetary wheel assembly is rotatably arranged in the shell assembly and comprises a power transmission part, a low-speed gear adjusting part and a high-speed gear adjusting part which are connected;

one end of the power input part extends into the shell assembly and is meshed with the power transmission part for transmission;

one end of the power output part extends into the shell assembly and is meshed with the power transmission part for transmission;

the high-speed gear ring is rotatably arranged in the shell assembly and is meshed with the high-speed gear adjusting part;

the low-gear ring is rotationally arranged in the shell assembly and is meshed with the low-gear adjusting part;

the gear adjusting component is matched with the shell assembly to change the limit and fix of the high-speed gear ring or the low-speed gear ring through a preset torque value;

when in use, the shell assembly is fixed to transmit torque; and when the high-speed gear ring is limited and fixed, the output speed ratio on the power output part is smaller than that when the low-speed gear ring is limited and fixed.

The working principle is as follows: when the power output part is used, the fixed shell assembly balances the torque force output by the power output part, the torque resistance of the screw nut is low, the gear adjusting component is used for limiting and fixing the high-speed gear ring, the low-speed gear ring is in a non-stressed following rotation state and does not participate in speed ratio conversion, the high-speed gear ring and the high-speed adjusting part are converted to obtain a lower speed ratio, the power output part outputs a higher rotating speed at the moment, the generated torque is relatively smaller, and the screw nut in the early stage can be quickly fastened; when the screw nuts are fastened in the last circles, resistance generated on the power output part is obviously increased, and the torque of the high-speed gear ring is increased under the reaction force so as to exceed a preset torque value, the gear adjusting component is converted to limit and fix the low-speed gear ring, the high-speed gear ring is in an unstressed following rotating state, the high-speed gear ring does not participate in speed ratio conversion, the low-speed gear ring and the low-speed gear adjusting part are converted to obtain a higher speed ratio, the power output part outputs a lower rotating speed at the moment, and the generated torque is relatively larger, so that enough acting force can be provided for the fastening of the screw nuts to efficiently finish the fastening of the screw nuts; the whole process is operated because the automatic gear shifting adjusting assembly is used for limiting and fixing the high-speed gear ring and the low-speed gear ring along with the change of the torque, so that the adjustment of the rotating speed and the torque is reasonably carried out on the power output part, and the screw nut is fastened efficiently.

Furthermore, the multi-connected planetary gear assembly also comprises a planetary carrier which is rotatably arranged in the shell assembly, a power transmission part, a low-speed gear adjusting part and a high-speed gear adjusting part are rotatably arranged in and out of the planetary carrier from bottom to top, the power transmission part, the low-speed gear adjusting part and the high-speed gear adjusting part respectively comprise a plurality of planetary gears which are circumferentially arranged and rotatably penetrate through the planetary carrier from inside to outside, the plurality of planetary gears in the power transmission part, the low-speed gear adjusting part and the high-speed gear adjusting part are correspondingly connected into a whole along the vertical direction one by one, the number of teeth of the planetary gears in the power transmission part, the number of teeth of the planetary gears in the low-speed gear adjusting part and the number of teeth of the planetary gears in the high-speed gear adjusting part are sequentially reduced, the plurality of planetary gears in the power transmission part are meshed outside one end of the power input part and inside one end of the power output part, the plurality of planetary gears in the low-speed gear adjusting part are meshed inside the low-speed gear ring gear, a plurality of planetary gears of the high-speed gear adjusting part are meshed with the inner side of the high-speed gear ring.

Furthermore, an installation space is formed between the casing assembly and the high-speed gear ring and between the casing assembly and the low-speed gear ring, the gear adjusting assembly comprises a gear shifting return ring which is arranged in the installation space in a sliding mode, one end of the gear shifting return ring is connected with the inner wall of the installation space through a spring, a plurality of installation holes are formed in the other end of the gear shifting return ring along the circumferential direction of the other end of the gear shifting return ring, a gear shifting steel ball is rotatably arranged in each installation hole, a plurality of gear shifting inclined grooves are formed in the outer wall of the high-speed gear ring along the circumferential direction of the high-speed gear ring, a plurality of straight grooves are formed in the outer wall of the low-speed gear ring along the circumferential direction of the low-speed gear ring, and the number of the gear shifting inclined grooves and the number of the straight grooves are not less than the number of the gear shifting steel balls; when the high-speed gear ring is limited and fixed, the plurality of gear shifting steel balls are abutted between the plurality of gear shifting chutes and the inner wall of the shell assembly in a one-to-one correspondence manner; when the low-gear ring is limited and fixed, the plurality of gear shifting steel balls are abutted between the plurality of straight grooves and the inner wall of the shell assembly in a one-to-one correspondence manner.

Further, every the chute of shifting is first breach groove, and the breach in first breach groove is arranged and first breach groove reduces from the width of its breach one end to the other end gradually towards low-speed gear ring gear.

Further, each straight groove is a second notch groove, the notch of the second notch groove is arranged towards the high-speed gear ring, and the width of one end of the notch of the second notch groove gradually increases towards the other end.

Furthermore, the casing assembly comprises a casing and a reaction arm casing, one end of the reaction arm casing is inserted into the casing and then rotates to be connected with the casing, one end of the power output part, far away from the power transmission part, freely penetrates out of the reaction arm casing, and one end of the power input part freely penetrates through the casing and then penetrates into the reaction arm casing to be meshed with the power transmission part.

Furthermore, the power output part comprises a gear ring section meshed on the outer side of the power transmission part and a power output shaft connected with the gear ring section, and one end, far away from the gear ring section, of the power output shaft freely penetrates out of the reaction arm sleeve shell.

Further, the casing assembly further comprises a reaction arm fixedly connected to the outer wall of the reaction arm casing.

Furthermore, the number of the gear shifting inclined grooves and the number of the straight grooves are multiple times of the number of the gear shifting steel balls.

Compared with the prior art, the utility model discloses following beneficial effect has:

this automatic double speed torque wrench includes the casing assembly, power transmission portion, low-gear regulating part, high-gear regulating part, power input portion, power output portion, high-gear ring gear, low-gear ring gear and gear adjusting part, comes to adopt the mode of high rotational speed and low moment of torsion earlier to fasten in the screw nut cooperation, and back automatically regulated fastens for the mode of low rotational speed and high moment of torsion, has improved the work efficiency of screw nut fastening in-process greatly.

Drawings

FIG. 1 is a partial cross-sectional view of an embodiment of the present invention;

fig. 2 is a schematic structural view of the shift chute and the straight groove in an embodiment of the present invention.

Reference numerals in the drawings of the specification include: the gear shifting device comprises a high-speed gear ring 1, a low-speed gear ring 2, a machine shell 3, a counter-force arm sleeve shell 4, a positioning screw rod 5, a counter-force arm 6, a planet carrier 7, a planetary gear 8, a gear shifting return ring 9, a spring 10, a gear shifting steel ball 11, a gear shifting chute 12, a straight groove 13, a power input shaft tooth 14, a gear ring section 15, a power output shaft 16 and a limiting groove 17.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments:

as shown in fig. 1, an embodiment of the present invention provides an automatic double-speed torque wrench, which includes a housing assembly, a multiple planetary wheel assembly, a power input portion, a power output portion, a high-speed gear ring 1, a low-speed gear ring 2, and a gear adjusting assembly, wherein the multiple planetary wheel assembly is rotatably disposed in the housing assembly and includes a power transmission portion, a low-speed gear adjusting portion, and a high-speed gear adjusting portion, which are connected to each other; one end of the power input part extends into the shell assembly to be meshed with the power transmission part for transmission, one end of the power output part extends into the shell assembly to be meshed with the power transmission part for transmission, the high-speed gear ring 1 is rotationally arranged in the shell assembly and is meshed with the high-speed gear adjusting part, the low-speed gear ring 2 is rotationally arranged in the shell assembly and is meshed with the low-speed gear adjusting part, and the gear adjusting component is matched with the shell assembly to change the limit of the high-speed gear ring 1 or the low-speed gear ring 2 through a preset torque value; when in use, the shell assembly is fixed to transmit torque; and when the high-speed gear ring 1 is limited and fixed, the output speed ratio on the power output part is smaller than that when the low-speed gear ring 2 is limited and fixed.

In this embodiment: when the device is used, the fixed shell 3 assembly balances the torque force output by the power output part, the torque resistance of the screw nut is low at the moment, the gear adjusting component is used for limiting and fixing the high-speed gear ring 1, the low-speed gear ring 2 is in an unstressed following rotating state, the low-speed gear ring 2 does not participate in speed ratio conversion, the high-speed gear ring 1 and the high-speed gear adjusting part are converted to obtain a lower speed ratio, the power output part outputs a higher rotating speed at the moment, the generated torque is relatively smaller, and the screw nut in the earlier stage can be quickly fastened; when the screw nuts are fastened in the last circles, resistance generated on the power output part is obviously increased, when the torque of the high-speed gear ring 1 is increased under the reaction force so as to exceed a preset torque value, the gear adjusting component is converted to limit and fix the low-speed gear ring 2, the high-speed gear ring 1 is in an unstressed following rotation state, the high-speed gear ring 1 does not participate in speed ratio conversion, the low-speed gear ring 2 and the low-speed gear adjusting part are converted to obtain a higher speed ratio, the power output part outputs a lower rotating speed at the moment, and the generated torque is relatively larger, so that enough acting force can be provided for the fastening of the screw nuts to efficiently fasten the screw nuts; the whole process is operated because the automatic gear shifting adjusting assembly is used for limiting and fixing the high-speed gear ring 1 and the low-speed gear ring 2 along with the change of the torque, so that the rotating speed and the torque are reasonably adjusted on the power output part, and the screw nut is fastened efficiently.

This automatic double speed torque wrench includes the casing assembly, power transmission portion, low-gear regulating part, high-gear regulating part, power input portion, power output portion, high-gear ring gear 1, low-gear ring gear 2 and gear adjusting component, comes to adopt the mode of high rotational speed and low moment of torsion earlier to fasten in the cooperation of screw nut, and back automatically regulated fastens for the mode of low rotational speed and high moment of torsion, has improved the work efficiency among the screw nut fastening process greatly.

As shown in fig. 1, according to another embodiment of the present invention, the automatic two-speed torque wrench comprises a housing 3 and a reaction arm sleeve 4 with one end inserted into the housing 3 and then rotated.

In this embodiment, after being inserted into the casing 3, one end of the specific reaction arm sleeve 4 is limited by the positioning screw 5, so that the reaction arm sleeve 4 and the casing 3 can rotate relatively and cannot move axially; the adopted shell 3 comprises a cylindrical section and a limiting section which is integrally formed at the inner side of one end of the cylindrical section, and an annular space is formed between the limiting section and the cylindrical section; when the installation is carried out, the limit section is contacted with the high-speed gear ring 1 to carry out installation limit on the high-speed gear ring 1; the reaction arm casing 4 comprises a large cylinder section inserted in the cylinder section and a small cylinder section connected with one end of the large cylinder section, the inner wall of the large cylinder section of the reaction arm casing 4 is provided with limiting grooves 17 with the same number as the gear shifting steel balls 11, the gear shifting steel balls 11 slide and abut against the limiting grooves 17 one by one, and the reaction arm casing is used for controlling the ring gear steel balls 11 to move only along the axial direction of the high-speed gear ring 1 to limit and fix the high-speed gear ring 1 and the low-speed gear ring 2; the positioning screw rod 5 is connected between the large cylinder section and the cylinder section to fix the shell 3 and the reaction arm sleeve shell 4, and the reaction arm sleeve shell 4 is structurally designed to arrange the multi-connected planetary wheel assembly and the power output part reasonably.

In order to better fix the shell assembly to transmit reaction force so as to increase the torque of the high-speed gear ring 1 when in use, so that the limit fixing of the gear adjusting component on the high-speed gear ring 1 is adjusted to be the limit fixing on the low-speed gear ring 2; when the reaction arm 6 on the outer wall of the reaction arm sleeve shell 4 is used, the reaction arm 6 is fixed, and the power output part rotates to output power.

As shown in fig. 1, according to another embodiment of the present invention, the automatic double-speed torque wrench, wherein the multiple planetary gear assembly further comprises a planetary carrier 7 rotatably disposed in the housing assembly, the power transmission portion, the low-speed gear adjustment portion and the high-speed gear adjustment portion are rotatably disposed inside and outside the planetary carrier 7 from bottom to top, the power transmission portion, the low-speed gear adjustment portion and the high-speed gear adjustment portion each comprise a plurality of planetary gears 8 circumferentially disposed and rotatably disposed inside and outside the planetary carrier 7, the plurality of planetary gears 8 in the power transmission portion, the low-speed gear adjustment portion and the high-speed gear adjustment portion are connected as a whole in a one-to-one correspondence manner along a vertical direction, and the number of teeth of the planetary gears 8 in the power transmission portion, the number of teeth of the planetary gears 8 in the low-speed gear adjustment portion and the number of teeth of the planetary gears 8 in the high-speed gear adjustment portion are sequentially reduced, the plurality of planetary gears 8 in the power transmission portion are engaged outside one end of the power input portion and inside one end of the power output portion, the plurality of planetary gears 8 of the low gear adjustment portion are meshed with the inner side of the low gear ring gear 2, and the plurality of planetary gears 8 of the high gear adjustment portion are meshed with the inner side of the high gear ring gear 1.

In the embodiment, the power transmission part, the low-gear adjusting part and the high-gear adjusting part are all composed of three planetary gears 8 which are annularly arranged, three planetary gears 8 in the power transmission part, the low-gear adjusting part and the high-gear adjusting part form three rows along the vertical direction, each row comprises one planetary gear 8 in the power transmission part, the low-gear adjusting part and the high-gear adjusting part, the three planetary gears 8 in each row are connected into a whole and can be fixed together through key connection, in the embodiment, the three planetary gears 8 in each row are integrally formed to form an integrated structure, and the radiuses and the number of gear teeth of the three planetary gears 8 in each row are sequentially reduced from bottom to top; the planet carrier 7 is of a cylindrical structure, three mounting holes are formed in the outer wall of the planet carrier along the circumferential direction of the planet carrier, and the middle parts of three planet gears 8 in each row are correspondingly mounted in one mounting hole, so that a part of the three planet gears 8 in each row are rotatably arranged in the planet carrier 7, and the other part of the three planet gears are rotatably arranged outside the planet carrier 7.

In the operation process of the automatic double-speed torque wrench, the planet carrier 7 rotates in the shell assembly all the time, and the power transmission part, the low-speed gear adjusting part and the high-speed gear adjusting part are matched with the power input part, the power output part, the high-speed gear ring 1 and the low-speed gear ring 2 through the structural design of three planet gears 8 to output high rotating speed and low torque on the power output part when the high-speed gear ring 1 is limited and fixed; when the low-gear ring 2 is limited and fixed, a low rotating speed and high torque are output on the power output part; so as to fasten the screw and the nut efficiently.

As shown in fig. 1, according to another embodiment of the present invention, an automatic double-speed torque wrench, wherein an installation space is formed between the housing assembly and the high-speed gear ring 1 and the low-speed gear ring 2, the gear adjusting component includes a shifting return ring 9 slidably disposed in the installation space, one end of the shifting return ring 9 is connected to the inner wall of the installation space through a spring 10, a plurality of installation holes are formed in the other end of the shifting return ring 9 along the circumferential direction thereof, a shifting steel ball 11 is rotatably disposed in each installation hole, a plurality of shifting chutes 12 are formed in the outer wall of the high-speed gear ring 1 along the circumferential direction thereof, a plurality of straight grooves 13 are formed in the outer wall of the low-speed gear ring 2 along the circumferential direction thereof, and the number of the straight grooves 13 and the number of the shifting chutes 12 are not less than the number of the shifting steel balls 11; when the high-speed gear ring 1 is limited and fixed, the plurality of gear shifting steel balls 11 are correspondingly abutted between the plurality of gear shifting chutes 12 and the inner wall of the shell assembly one by one; when the low-gear ring 2 is limited and fixed, the plurality of gear shifting steel balls 11 are correspondingly abutted between the plurality of straight grooves 13 and the inner wall of the shell assembly one by one.

In the present embodiment, a specific installation space is provided between the housing 3 and the high-speed ring gear 1 and the low-speed ring gear 2, and this installation space is located in the annular space; when the automatic double-speed torque wrench is started for use, the reaction arm 6 on the reaction arm sleeve shell 4 is fixed to balance the output torque force, the torque resistance of the screw nut is low, the spring 10 utilizes the gear shifting return ring 9 to push the gear shifting steel balls 11 arranged in the straight grooves 13 to the gear shifting chute 12 of the high-speed gear ring 1 in a one-to-one correspondence manner, the limiting groove 17 arranged on the inner wall of the reaction arm sleeve shell 4 is utilized to limit and fix the high-speed gear ring 1, the low-speed gear ring 2 is in an unstressed following rotation state, the low-speed gear ring 2 does not participate in speed ratio conversion, the high-speed gear ring 1 and the high-speed gear adjusting part are converted to obtain a lower speed ratio, the power output part outputs a higher rotating speed at the moment, the generated torque is relatively smaller, and the screw nut in the early stage can be quickly fastened; when the screw nuts are fastened in the last circles, the resistance generated on the power output part is obviously increased, the torque of the high-speed gear ring 1 is increased under the action of a reaction force, the gear shifting chute 12 on the outer circumference of the high-speed gear ring 1 drives the gear shifting steel ball 11 to move into the corresponding straight groove 13 on the low-speed gear ring 2 after overcoming the resistance of the spring 10 and be limited and fixed by the limiting groove 17 on the inner wall of the reaction arm casing 4 (at the moment, the preset torque value is obtained), the high-speed gear ring 1 is in a non-stressed following rotation state, the high-speed gear ring 1 does not participate in speed ratio conversion, the low-speed gear ring 2 and the low-speed gear adjusting part are converted to obtain a higher speed ratio, and at the moment, the power output part outputs a lower rotating speed and generates a relatively larger torque, so that enough acting force can be provided for the fastening of the screw nuts to fasten the screw nuts; after the screw nuts are fastened, the power output part is disconnected from the screw nuts, the torque on the power output part is obviously reduced at the moment, and the axial thrust on the gear shifting steel balls 11 is obviously smaller than the elastic force of the springs 10, so that the springs 10 push the gear shifting return rings 9 to drive the gear shifting steel balls 11 to move back to the corresponding gear shifting inclined grooves 12 in a reverse direction; in the embodiment, the number of the straight grooves 13 and the number of the shift chutes 12 are designed to be multiple of the number of the shift steel balls 11, so that the automatic two-speed torque wrench is more stable and faster in two-stage conversion between high speed and low speed.

With reference to fig. 2, each shift chute 12 adopted based on the above scheme is a first notch groove, the notch of the first notch groove is arranged toward the low-speed gear ring 2, and the width of the first notch groove decreases gradually from one end of the notch to the other end of the notch.

The shift chute 12 is defined based on the above structure, so that an inclined inner wall for guiding the shift steel ball 11 is formed in the shift chute, when the resistance generated by the last several circles of fastening of the screw nut is obviously increased, the torque on the high-speed gear ring 1 is increased by the reaction force, the axial component force towards the spring 10 is generated on the shift steel ball 11 by the inclined inner wall of the shift chute 12 in the shift chute 12, the axial component force is the above axial thrust force, so that the shift steel balls 11 are all pushed into the corresponding straight grooves 13, and the low-speed gear ring 2 is limited and fixed; in this embodiment, the first notch groove is triangular, and the inner wall for guiding the shifting steel ball 11 together with the notch of the first notch groove may be formed by connecting a plurality of side inner walls with different inclination angles.

Still be based on above-mentioned scheme simultaneously, every straight recess 13 that adopts is the second breach groove, and the breach in second breach groove is arranged towards high-speed gear ring 1 and the second breach groove is from the width of its breach one end to other end crescent.

In this embodiment, the second notch groove is in an isosceles trapezoid shape, so as to limit the guided shifting steel ball 11, and thus limit and fix the low-speed gear ring 2.

As shown in fig. 1, according to another embodiment of the present invention, the automatic double-speed torque wrench is characterized in that the power input portion can be a power input shaft tooth 14, one end of the power input shaft tooth 14 is driven by a motor to rotate, the other end of the power input shaft tooth has a gear ring, and the gear ring freely passes through the casing 3 and then penetrates into the force arm casing to be engaged with the power transmission portion, i.e. engaged with the three planetary gears 8 in the power transmission portion, so as to perform transmission.

In order to improve the stability of the power input shaft teeth 14 in the rotating process, a bearing fixedly embedded in one end of the planet carrier 7 is fixedly sleeved outside the middle part of the power input shaft teeth.

Based on the scheme, the adopted power output part comprises a gear ring section 15 meshed outside the power transmission part and a power output shaft 16 connected with the gear ring section 15, and one end of the power output shaft 16 far away from the gear ring section 15 freely penetrates out of the reaction arm sleeve shell 4; in particular, the ring gear section 15 is engaged outside the three planet gears 8 in the power transmission part; the gear ring section 15, three planet gears 8 in the power transmission part and the shaft tooth end of the power input shaft tooth 14 are matched to form a planet gear structure, when a middle sun gear, a planet gear and an inner gear ring in the planet gear structure are not fixed, power cannot be transmitted, in the scheme, the low-speed gear ring 2 or the high-speed gear ring 1 is limited and fixed, so that power is transmitted on the gear ring section 15 to drive the power output shaft 16 to rotate, the power output shaft 16 can be connected with tools such as a sleeve and the like in a connecting mode of splines, square heads and the like, and when the power output shaft 16 rotates, the sleeve is driven to rotate, so that a nut or a screw rotates to fasten a nut and a screw rod.

Due to the size design of the planetary gears 8 in the power transmission part, the low gear adjustment part and the high gear adjustment part, the inner diameters and the number of teeth of the corresponding gear ring sections 15, the low gear ring 2 and the high gear ring 1 are reduced in sequence.

The number of teeth of the high-speed gear ring 1 is set to a, the number of teeth of the planetary gear 8 in the high-speed gear adjustment portion is set to b, the number of teeth of the low-speed gear ring 2 is set to c, the number of teeth of the planetary gear 8 in the low-speed gear adjustment portion is set to d, the number of teeth of the gear ring segment 15 is set to e, the number of teeth of the planetary gear 8 in the power transmission portion is set to f, and the number of teeth of the shaft tooth end of the power input shaft tooth 14 is set to g.

When the high-speed gear ring 1 is limited and fixed, the output speed ratio of the power output shaft 16 is calculated according to the formula:

when the low-gear ring gear 2 is limited and fixed, the output speed ratio of the power output shaft 16 is calculated according to the formula:

when the high-speed gear ring 1 is limited and fixed, the output speed ratio of the power output shaft 16 reaches dozens; when the low-gear ring gear 2 is limited and fixed, the output speed ratio of the power output shaft 16 reaches hundreds, so that the actual use requirement is met.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. An automatic two-speed torque wrench, comprising:

a housing assembly;

2. The automated two-speed torque wrench as claimed in claim 1, further comprising: the multi-connection planetary gear assembly further comprises a planetary carrier rotationally arranged in the housing assembly, a power transmission part, a low-gear adjusting part and a high-gear adjusting part are rotationally arranged inside and outside the planetary carrier from bottom to top, the power transmission part, the low-gear adjusting part and the high-gear adjusting part respectively comprise a plurality of planetary gears which are circumferentially arranged and rotationally penetrate through the planetary carrier and the outside, the plurality of planetary gears in the power transmission part, the low-gear adjusting part and the high-gear adjusting part are correspondingly connected into a whole in a one-to-one correspondence mode along the vertical direction, the number of teeth of the planetary gears in the power transmission part, the number of teeth of the planetary gears in the low-gear adjusting part and the number of teeth of the planetary gears in the high-gear adjusting part are sequentially reduced, the plurality of planetary gears in the power transmission part are meshed outside one end of the power input part and inside one end of the power output part, and the plurality of planetary gears in the low-gear adjusting part are meshed inside the low-gear ring gear, a plurality of planetary gears of the high-speed gear adjusting part are meshed with the inner side of the high-speed gear ring.

3. An automatic two-speed torque wrench as claimed in claim 1, wherein: the gear adjusting component comprises a gear shifting return ring which is arranged in the mounting space in a sliding mode, one end of the gear shifting return ring is connected with the inner wall of the mounting space through a spring, the other end of the gear shifting return ring is provided with a plurality of mounting holes along the circumferential direction, a gear shifting steel ball is rotatably arranged in each mounting hole, the outer wall of the high-speed gear ring is provided with a plurality of gear shifting chutes along the circumferential direction, the outer wall of the low-speed gear ring is provided with a plurality of straight grooves along the circumferential direction, and the number of the gear shifting chutes and the number of the straight grooves are not less than that of the gear shifting steel balls; when the high-speed gear ring is limited and fixed, the plurality of gear shifting steel balls are abutted between the plurality of gear shifting chutes and the inner wall of the shell assembly in a one-to-one correspondence manner; when the low-gear ring is limited and fixed, the plurality of gear shifting steel balls are abutted between the plurality of straight grooves and the inner wall of the shell assembly in a one-to-one correspondence manner.

4. An automated two-speed torque wrench as claimed in claim 3, wherein: every the skewed slot of shifting is first breach groove, and the breach in first breach groove is arranged and first breach groove reduces from the width of its breach one end to the other end gradually towards low-speed gear ring gear.

5. An automated two-speed torque wrench as claimed in claim 3, wherein: every straight recess is second breach groove, and the breach in second breach groove is arranged towards high-speed shelves ring gear and second breach groove from the width of its breach one end to other end crescent.

6. The automated two-speed torque wrench as claimed in claim 1, further comprising: the shell assembly comprises a shell and a reaction arm sleeve shell, wherein one end of the reaction arm sleeve shell is inserted into the shell and then rotates to be connected with the shell, one end of the power output part, far away from the power transmission part, freely penetrates out of the reaction arm sleeve shell, and one end of the power input part freely penetrates through the shell and then penetrates into the reaction arm sleeve shell to be meshed with the power transmission part.

7. The automated two-speed torque wrench as claimed in claim 6, further comprising: the power output part comprises a gear ring section meshed outside the power transmission part and a power output shaft connected with the gear ring section, and one end of the power output shaft, which is far away from the gear ring section, freely penetrates out of the reaction arm sleeve shell.

8. The automated two-speed torque wrench as claimed in claim 6, further comprising: the casing assembly further comprises a reaction arm fixedly connected to the outer wall of the reaction arm casing.

9. An automatic two-speed torque wrench as claimed in claim 3, wherein: the number of the gear shifting inclined grooves and the number of the straight grooves are multiple times of the number of the gear shifting steel balls.