CN114952693A - Clutch type power transmission device and torsion detection module thereof - Google Patents

Clutch type power transmission device and torsion detection module thereof Download PDF

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Publication number
CN114952693A
CN114952693A CN202110216620.9A CN202110216620A CN114952693A CN 114952693 A CN114952693 A CN 114952693A CN 202110216620 A CN202110216620 A CN 202110216620A CN 114952693 A CN114952693 A CN 114952693A
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CN
China
Prior art keywords
torque
type power
clutch
power transmission
strain
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Pending
Application number
CN202110216620.9A
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Chinese (zh)
Inventor
胡越阳
姚世彬
曾竺湘
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Shuofeng Industrial Co ltd
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Shuofeng Industrial Co ltd
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Priority to CN202110216620.9A priority Critical patent/CN114952693A/en
Publication of CN114952693A publication Critical patent/CN114952693A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/147Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H1/00Toothed gearings for conveying rotary motion
    • F16H1/28Toothed gearings for conveying rotary motion with gears having orbital motion
    • F16H1/32Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00Measuring force or stress, in general
    • G01L1/20Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00Measuring force or stress, in general
    • G01L1/20Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/225Measuring circuits therefor
    • G01L1/2262Measuring circuits therefor involving simple electrical bridges
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/24Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H1/00Toothed gearings for conveying rotary motion
    • F16H1/28Toothed gearings for conveying rotary motion with gears having orbital motion
    • F16H1/32Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear
    • F16H2001/327Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear with orbital gear sets comprising an internally toothed ring gear

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Retarders (AREA)

Abstract

The invention provides a torque force detection module of a clutch type power transmission device, which comprises a fixed outer cylinder, a planetary gear set, a power transmission shaft and a torque force sensing assembly. The fixed outer cylinder is arranged between a power source input shaft and a clutch type power output assembly. The planetary gear set is connected with the clutch type power output assembly. The power transmission shaft is connected with the power source input shaft and the clutch type power output assembly along an axial direction. A torsion strain cylinder of the torsion sensing assembly is sleeved on the power transmission shaft. A strain gauge of the torque force sensing assembly is vertically and axially arranged on the torque force strain cylinder and used for sensing a shear force strain amount which is 45 degrees from the axial direction and is caused by the planetary gear set to the torque force strain cylinder, and the effect of calculating an output torque force which is output to the clutch type power output assembly by the planetary gear set is achieved.

Description

Clutch type power transmission device and torsion detection module thereof
Technical Field
The present disclosure relates to power transmission devices and, particularly, to a clutch type power transmission device and a torque detection module thereof.
Background
An electric screwdriver (electric screwdriver) is a tool that relies on a power source input shaft to provide a rotational driving force and then outputs rotational kinetic energy through a clutch type power output assembly. The torque lock is generally applied to a torque lock of equipment and equipment with locking requirements, and the labor consumed by manual rotation operation can be saved, the locking process time can be shortened, the operation efficiency can be improved and the like by the aid of the rotation driving force provided by the power source input shaft.
In the prior art, a conventional electric screwdriver utilizes an externally exposed clutch type torque adjuster for users to adjust the torque, however, the adjustment is an approximate value, and the torque value of the output torque cannot be known accurately.
Further, there is also a conventional electric screwdriver in which a torque value is detected by a strain gauge provided in a torque strain cylinder in an axial direction and a bending stress (bending) of the strain gauge. However, since the strain gauges are axially disposed on the torsion strain cylinder, four strain gauges are usually disposed, and the structure of the torsion strain cylinder needs to be designed corresponding to the four strain gauges, so the process steps are complicated and the cost is high. In addition, the torsion strain cylinder has a structure that the bending stress is concentrated, which is likely to cause fracture. Thus, the prior art has room for improvement.
Disclosure of Invention
In view of the problems of the prior art, the electric screwdriver has the disadvantages that the torque value of the output torque cannot be accurately known, the manufacturing process is complicated, the cost is high, and the torsion strain cylinder is easy to break due to the concentrated bending stress. A primary objective of the present invention is to provide a torque detection module for a clutch-type power transmission device to solve at least one problem in the prior art.
The present invention is directed to a torque detection module of a clutch-type power transmission device, which is disposed on a power source input shaft and a clutch-type power output assembly, and includes a fixed outer cylinder, a planetary gear set, a power transmission shaft, and a torque sensing assembly.
The fixed outer cylinder is arranged between the power source input shaft and the clutch type power output assembly. The planetary gear set is connected with the clutch type power output assembly. The power transmission shaft is connected with the power source input shaft and the clutch type power output assembly along an axial direction. The torque sensing assembly comprises a torque strain cylinder and at least one strain gauge. The torsion strain cylinder is sleeved on the power transmission shaft and is respectively fixed on the fixed outer cylinder and the planetary gear set. The strain gauge is arranged on the torsion strain cylinder in a vertical axial direction.
When a clutch mechanism of the clutch type power output assembly is in a just-separated state, the strain gauge senses at least one shear strain quantity which is 45 degrees from the axial direction and is caused by the torque strain cylinder by the planetary gear set, and an output torque force which is output to the clutch type power output assembly by the planetary gear set is calculated according to the shear strain quantity.
Based on the above-mentioned necessary technical means, an accessory technical means derived from the invention is that the torque force detection module of the clutch type power transmission device further comprises a display interface, and the display interface is electrically connected with the torque force sensing assembly and is used for displaying the torque force value of the output torque force.
Based on the above-mentioned necessary technical means, an accessory technical means derived from the present invention is to make the torque force detection module of the clutch type power transmission device further comprise a processing unit, wherein the processing unit is electrically connected to the torque force sensing assembly for processing the torque force value of the output torque force, the rotation circle value of the output torque force and the action time value of the output torque force.
Based on the above-mentioned necessary technical means, an accessory technical means derived from the present invention is to enable the torque force detection module of the clutch type power transmission device to further comprise a warning unit, wherein the warning unit is electrically connected to the processing unit and is used for generating a warning message when the output torque force triggers a warning condition.
Based on the above-mentioned necessary technical means, an accessory technical means derived from the present invention is that the torque force detection module of the clutch type power transmission device further comprises a storage unit electrically connected to the processing unit for storing the torque force values of all the output torque forces, the number of the rotation circles of all the output torque forces, and the action time values of all the output torque forces.
Based on the above-mentioned necessary technical means, an accessory technical means derived from the present invention is that the torque force detection module of the clutch type power transmission device further comprises a communication unit electrically connected to the processing unit for communicating and transmitting at least one of the torque force value of the output torque force, the rotation number of the output torque force and the action time value of the output torque force.
Based on the above-mentioned necessary technical means, an auxiliary technical means derived from the present invention is to provide a torsion strain cylinder in a torsion detection module of a clutch type power transmission device, comprising an upper cylinder seat, a lower cylinder seat and an extension cylinder part. The upper cylindrical seat is adjacent to the power source input shaft. The lower cylinder seat is adjacent to the clutch type power output assembly. The extension cylinder part is hollow cylinder shape, connects the upper cylinder seat and the lower cylinder seat along the axial direction, and has a circumferential wall for setting the strain gauge.
Based on the above-mentioned necessary technical means, an auxiliary technical means derived from the present invention is to provide a torsion strain cylinder in a torsion detection module of a clutch type power transmission device, comprising an upper cylinder seat, a lower cylinder seat and an extension portion. The upper cylindrical seat is adjacent to the power source input shaft. The lower cylinder seat is adjacent to the clutch type power output assembly. The extension part is hollow, connects the upper cylinder seat and the lower cylinder seat along the axial direction, and is provided with two opposite installation surfaces and two opposite opening surfaces, and the installation surfaces are provided for the strain gauges to be arranged.
Based on the above-mentioned necessary technical means, an auxiliary technical means derived from the present invention is to make the extending portion of the torque force detecting module of the clutch type power transmission device have a groove on the opening surface, and the groove extends to the upper cylinder seat and the lower cylinder seat.
Based on the above-mentioned necessary technical means, an auxiliary technical means derived from the present invention is to make the extending portions in the torque force detecting module of the clutch type power transmission device have through holes on the opening surfaces, respectively, and the through holes penetrate through the extending portions.
Based on the above-mentioned necessary technical means, an accessory technical means derived from the present invention is to make the installation surfaces in the torque force detection module of the clutch type power transmission device parallel to each other and the opening surfaces parallel to each other.
The present invention provides a clutch type power transmission device, including a power source, a clutch type power output assembly and a torque detection module. The power source has a power source input shaft. The torque detection module is arranged on a power source input shaft and a clutch type power output assembly and comprises a fixed outer barrel, a planetary gear set, a power transmission shaft and a torque sensing assembly.
The fixed outer cylinder is arranged between the power source input shaft and the clutch type power output assembly. The planetary gear set is connected with the clutch type power output assembly. The power transmission shaft is connected with the power source input shaft and the clutch type power output assembly along an axial direction. The torque sensing assembly comprises a torque strain cylinder and at least one strain gauge. The torsion strain cylinder is sleeved on the power transmission shaft and is respectively fixed on the fixed outer cylinder and the planetary gear set. The strain gauge is arranged on the torsion strain cylinder in a vertical axial direction. When a clutch mechanism of the clutch type power output assembly is in a just-separated state, the strain gauge senses at least one shear strain quantity which is 45 degrees away from the axial direction and is caused by the planetary gear set to the torsion strain cylinder, and an output torsion force which is output to the clutch type power output assembly by the planetary gear set is calculated according to the shear strain quantity.
In view of the above, the clutch-type power transmission device and the torque detection module thereof provided by the present invention utilize the strain gauge to be vertically and axially arranged on the torque strain cylinder, compared with the prior art, the strain gauge of the present invention senses the shear strain amount of the torque strain cylinder caused by the planetary gear set to the torque strain cylinder and forming an angle of 45 degrees with the axial direction, and calculates the output torque force of the planetary gear set output to the clutch-type power output assembly. The torsion strain cylinder of the invention has a hollow structure, and the number of strain gauges is less, so the process is simpler and the cost is lower. In addition, the concentration ratio of the force is dispersed, so that the risk of breakage of the torsion strain cylinder is smaller than that of the prior art, and the service life is longer. In addition, the extension part of the torsion strain cylinder is further provided with a groove or a through hole on the opening surface, so that the effects of reducing the sectional area and improving the deformation under the same torsion are achieved, and the output torsion calculated by the strain gauge is more accurate.
Drawings
Fig. 1 is a perspective view showing a clutch type power transmission device according to a first embodiment of the invention;
fig. 2 is an exploded view showing a clutch type power transmission device provided in a first embodiment of the present invention;
FIG. 3 is a partial cross-sectional view showing A-A of FIG. 1;
FIG. 4 is a schematic cross-sectional view showing the clutch-type power take-off assembly in a just-disengaged condition;
FIG. 5 is a cross-sectional view showing B-B of FIG. 1;
fig. 6 is a schematic diagram illustrating a torque sensing assembly of a torque detecting module of the clutch-type power transmission device according to the first embodiment of the invention;
fig. 7 is a schematic view showing the amount of shear strain generated by the strain gauge of the torque sensing assembly of the torque detecting module of the clutch-type power transmission device according to the first embodiment of the present invention;
fig. 8 is a front view showing a clutch type power transmission device provided in the first embodiment of the invention;
fig. 9 is a block diagram illustrating a torque detection module of the clutch type power transmission device according to the first embodiment of the present invention;
fig. 10 is a perspective view illustrating a torque sensing assembly according to a second embodiment of the present invention;
FIG. 11 is a cross-sectional view showing C-C of FIG. 10;
fig. 12 is a perspective view illustrating a torque sensing assembly according to a third embodiment of the present invention; and
fig. 13 is a cross-sectional view showing D-D of fig. 12.
Description of the symbols
100 clutch type power transmission device
1: torsion detection module
11 fixed outer cylinder
12 planetary gear set
121 sun gear
122 planet gear
123 ring tooth
13,13a,13b torsion sensing assembly
131,131a,131b torsional strain cylinder
1311,1311a,1311b upper cylinder seat
1312,1312a,1312b lower cylinder seat
1313 extended cylindrical portion
1313a,1313b extensions
132a,132 a', 132b strain gauges
14 power transmission shaft
15 display interface
16 processing unit
17 warning unit
18 storage unit
19 communication unit
20 Wheatstone bridge
21 signal amplifying circuit
22 filter
23 digital filter
Button assembly 24
3 power source
4-clutch type power output assembly
5, output end shell
6 main casing
7: signal transmission line assembly
8: display box
D1, D1': axial direction
D2 first direction
D2' second direction
D3, D4, D5, D6 deformation directions
Ha, Hb, through hole
S is the clearance
S1a, S1b setting surface
S2a, S2b open noodles
Ta, Tb groove
Detailed Description
The following describes in more detail embodiments of the present invention with reference to the schematic drawings. Advantages and features of the present invention will become apparent from the following description and claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Referring to fig. 1 to 7, fig. 1 is a perspective view illustrating a clutch type power transmission device according to a first embodiment of the present invention; fig. 2 is an exploded view showing a clutch type power transmission device provided in a first embodiment of the present invention; FIG. 3 is a partial cross-sectional view showing A-A of FIG. 1; FIG. 4 is a schematic cross-sectional view showing the clutch-type power take-off assembly in a just-disengaged condition; FIG. 5 is a cross-sectional view showing B-B of FIG. 1; fig. 6 is a schematic view illustrating a torque sensing assembly of a torque detecting module of the clutch type power transmission device according to the first embodiment of the present invention; fig. 7 is a schematic diagram illustrating the amount of shear strain generated by the strain gauge of the torque sensing assembly of the torque detecting module of the clutch-type power transmission device according to the first embodiment of the present invention.
As shown in the figure, a clutch type power transmission device 100 includes a torque force detection module 1, a power source 3, a clutch type power output assembly 4, an output end housing 5, a main housing 6, a signal transmission line assembly 7 and a display box 8. The torque detection module 1 is disposed between the power source 3 and the clutch type power output assembly 4, and includes a fixed outer cylinder 11, a planetary gear set 12, a torque sensing assembly 13 and a power transmission shaft 14.
The fixed outer cylinder 11 is disposed between a power source input shaft of the power source 3 and the clutch type power output assembly 4. The planetary gear set 12 is coupled to the clutched power take-off assembly 4. The power transmission shaft 14 connects the power source input shaft and the clutch type power output assembly 4 along an axial direction D1.
The torque sensor assembly 13 includes a torque strain cylinder 131 and at least one strain gauge, wherein the drawings illustrate and mark two strain gauges 132a,132 b. The torsion strain cylinder 131 is sleeved on the power transmission shaft 14 and fixed to the fixed outer cylinder 11 and the planetary gear set 12, respectively. The strain gauges 132a and 132b are provided to the torsional strain cylinder 131 perpendicularly to the axial direction D1. Because the strain gauges 132a,132 b are in a sheet-like structure and belong to a "plane" in geometry, and the axial direction D1 belongs to a "line", the " strain gauges 132a,132 b disposed on the torsional strain cylinder 131 perpendicular to the axial direction D1" described herein is a direction vector indicating that a normal vector of the strain gauges 132a,132 b is perpendicular to the axial direction D1, and thus, the description is given.
Generally, the torque detection module 1, the power source 3 and the clutch type power output assembly 4 are located in the output end housing 5, the main housing 6 and the display box 8. The signal transmission line assembly 7 connects the main housing 6 and the display box 8.
When the clutch structure of the clutch type power output assembly 4 is in a combined state, as shown in fig. 3, the output torque of the clutch type power output assembly 4 is the output torque outputted from the planetary gear set 12 to the clutch type power output assembly 4.
When the clutch structure of the clutch type power output assembly 4 is in a just-disengaged state, as shown in fig. 4, a gap S is generated in the clutch type power output assembly 4 compared to fig. 3, and the power source 3 stops operating, at this time, the strain gauges 132a and 132b sense the amount of shear strain caused by the planetary gear set 12 to the torsion strain cylinder 131, so as to calculate the output torsion force output from the planetary gear set 12 to the clutch type power output assembly 4.
More specifically, the planetary gear set 12 includes a sun gear 121, a plurality of planet gears 122 (four of which are shown and one of which is shown), and a ring gear 123, as shown in FIG. 5. The sun gear 121 has a radius r s The planet teeth 122 have a radius r p The radius of the ring gear 123 is r r The center distance between the sun gear 121 and the planet gear 122 is r o Output torque of T o The force applied to the center of the planet gear 122 is F p The ring gear 123 is at the pitch circle radiusIs subjected to a force F r The force on the sun gear 121 at the pitch circle radius is F s Reaction force is T r
Output torque force T o =F p *r o ,F p =2F r =2F s ,r r =r s +2r p ,r o =r s +r p Reaction force T r =F r *r r Thus, T r =(F p /2)*(r s +2r p )=[T o /2*(r s +r p )]*(r s +2r p ). From the above description, the strain gauges 132a,132 b may be used to sense the reaction force (T) of the ring gear 123 on the planetary gear set 12 r ) Further, the output torque (T) is derived o ). The above reference numbers are only for convenience of derivation and discussion of the formulas, and the cross-sectional lines of the drawings are too many, so that the drawings are not marked in the drawings in order to avoid the disorder caused by too many lines.
When the planetary gear set 12 outputs the output torque to the clutch-type power output assembly 4, the strain gauge 132a senses a shear strain amount. A deformation direction of the shear strain amount is 45 degrees from the axial direction D1, as shown in fig. 7. When the output torque force is generated, the strain gauge 132a senses the shear strain amount and is deformed into the strain gauge 132 a' by the shear strain amount, as shown in fig. 6 and 7. Similarly, the strain gauge 132b is also the same, so it is not repeated herein. Therefore, the strain gauges 132a and 132b can calculate the output torque force of the planetary gear set 12 to the clutch type power output assembly 4 by sensing the amount of shear strain of the torque strain cylinder 131 caused by the planetary gear set 12 at 45 degrees from the axial direction D1.
The torsional strain cylinder 131 includes an upper cylinder seat 1311, a lower cylinder seat 1312 and an extension cylinder part 1313. The upper cylinder seat 1311 is adjacent to the power source input shaft of the power source 3. The lower cylindrical seat 1312 is adjacent the clutched power take-off assembly 4. The extension cylindrical portion 1313 extends in the axial direction D1 and connects the upper cylindrical seat 1311 and the lower cylindrical seat 1312. In the present embodiment, the extension cylindrical portion 1313 has a hollow cylindrical shape and has a circumferential wall. The strain gauges 132a,132 b are provided on the circumferential wall. Generally, the upper cylinder 1311 is fixed and the lower cylinder 1312 is output rotation.
More specifically, when the lower cylindrical seat 1312 receives a torque (torque) in a first direction D2, the upper cylindrical seat 1311 receives a torque in a second direction D2' opposite to the first direction D2. At this time, the upper left corner of the strain gauge 132a is subjected to a shear strain along a deformation direction D3, the lower right corner of the strain gauge 132a is subjected to a shear strain along a deformation direction D4, the lower left corner of the strain gauge 132a is subjected to a shear strain along a deformation direction D5, and the upper right corner of the strain gauge 132a is subjected to a shear strain along a deformation direction D6, so that the strain gauge 132a is deformed into the strain gauge 132 a'. Compared with the prior art, the deformation directions D3 and D5 of the detected shear strain amount are 45 degrees away from the axial direction D1', and the deformation directions D4 and D6 of the detected shear strain amount are 45 degrees away from the axial direction D1.
Compared to the prior art, the extended cylindrical portion 1313 of this embodiment is hollow cylindrical, and the number of strain gauges 132a and 132b is small, so the process is simple and the cost is low. In addition, the concentration of force is less than that of the prior art, and therefore, the risk of breaking the torsional strain cylinder 131 is less than that of the prior art, and the service life is better than that of the prior art.
Next, please refer to fig. 2, 8 and 9 together, wherein fig. 8 is a front view of the clutch type power transmission device according to the first embodiment of the present invention; fig. 9 is a block diagram of the torque force detecting module of the clutch type power transmission device according to the first embodiment of the present invention. As shown in the figure, the torque detection module 1 further includes a display interface 15, a processing unit 16, a warning unit 17, a storage unit 18 and a communication unit 19.
The processing unit 16 is electrically connected to the torque sensing assembly 13 for processing the torque value of the output torque, the rotation number of the output torque and the acting time of the output torque. It should be noted that the value of the action time herein indicates a time during which the planetary gear set 12 outputs the output torque to the clutch type power output assembly 4.
In practice, the sensing signals of the strain gauges 132a and 132b (fig. 9 only indicates the strain gauge 132a) of the torque sensing assembly 13 are transmitted to the processing unit 16 via a wheatstone bridge 20, a signal amplifying circuit 21, a filter 22 and a digital filter 23.
More specifically, when the amount of shear strain is generated, the resistances of the strain gauges 132a and 132b are changed. The wheatstone bridge 20 will convert the change in resistance into a voltage change signal. Since the voltage difference of the voltage change signal is small, the voltage and the voltage difference need to be amplified by the signal amplification circuit 21. Generally, the magnification is usually more than 500 times. Therefore, after the sensing signal is amplified by the signal amplifying circuit 21, the noise needs to be filtered for the first time by the filter 22. The wheatstone bridge 20, the signal amplification circuit 21 and the filter 22 are usually disposed in the output terminal housing 5 and the main housing 6.
Then, the sensing signal after the first filtering of the noise by the filter 22 is transmitted to the processing unit 16 through the signal transmission line assembly 7. In the process of transmitting through the signal transmission line assembly 7, the quality of the signal may be affected by the electromagnetic wave generated during the line unloading, so that the sensing signal passes through the digital filter 23 before being transmitted to the processing unit 16 through the signal transmission line assembly 7, thereby improving the signal quality and stability of the sensing signal. The digital filter 23 and the processing unit 16 are usually disposed in the display box 8.
The display interface 15 is used to display the torque value of the output torque, but not limited thereto. The display interface 15 can also display the rotation number or the acting time of the output torque. In practice, the display interface 15 is disposed on one of the outer surfaces of the display box 8. In this embodiment, the torque detection module 1 further includes a button assembly 24, which is used by the user in cooperation with the display interface 15 to switch the information displayed on the display interface 15.
The warning unit 17 is electrically connected to the processing unit 16 for generating a warning message when the output torque triggers a warning condition. The warning condition may be a condition for a torque value, a rotation circle value, or an action time value, such as: the torque value does not reach a target torque value, the torque value does not reach a lower torque limit value, the torque value exceeds an upper torque limit value, the rotation circle value is lower than a lower circle number limit value, the rotation circle value is higher than an upper circle number limit value, the action time value is lower than a lower time limit value, the action time value is higher than an upper time limit value, and the like. The warning message may be a sound, text, vibration or other message that alerts the user.
The storage unit 18 is electrically connected to the processing unit 16 for storing the torque value, the rotation number and the acting time value processed by the processing unit 16.
The communication unit 19 is electrically connected to the processing unit 16 for communicating the torque value, the rotation number and the acting time value processed by the processing unit 16. The communication unit 19 may send the information to a mobile device, a cloud database, or any device capable of receiving the information. The communication unit 19 may transmit the data out using Wi-Fi, bluetooth, RS232, RS485, USB, RJ45, or other communication interfaces. In the present embodiment, the processing unit 16, the warning unit 17, the storage unit 18, and the communication unit 19 are provided to the display box 8.
Therefore, compared to the prior art, the present embodiment utilizes the strain gauges 132a and 132b to be disposed on the torsion strain cylinder 131 perpendicular to the axial direction D1, and senses the amount of shear strain of the planetary gear set 12 on the torsion strain cylinder 131, which is 45 degrees from the axial direction D1, so as to calculate the output torsion force of the planetary gear set 12 to the clutch type power output assembly 4.
Next, please refer to fig. 2, fig. 10 and fig. 11 together, wherein fig. 10 is a perspective view illustrating a torque sensing assembly according to a second embodiment of the present invention; and, FIG. 11 is a cross-sectional view showing C-C of FIG. 10. As shown in the figure, a torsion sensing assembly 13a includes a torsion strain cylinder 131a and strain gauges 132a and 132b, wherein the strain gauges 132a and 132b are the same as the arrangement manner and the manner of sensing the shear strain amount in the first embodiment, and will not be described in detail.
The torsion strain cylinder 131a includes an upper cylinder seat 1311a, a lower cylinder seat 1312a and an extension part 1313 a. The extension portion 1313a connects the upper cylindrical seat 1311a and the lower cylindrical seat 1312a in the axial direction D1, and has two installation surfaces S1a and S1b facing each other and two opening surfaces S2a and S2b facing each other. As shown in fig. 11, the extending portion 1313a is hollow, and the installation surface S1a is parallel to the installation surface S1b, and the opening surface S2a is parallel to the opening surface S2 b.
In the present embodiment, the strain gauge 132a is disposed on the installation surface S1a, and the strain gauge 132b is disposed on the installation surface S1 b. The torsion strain cylinder 131a has a groove Ta and a groove Tb respectively formed on the opening surface S2a and the opening surface S2b, and the grooves Ta and Tb respectively extend to the upper cylindrical seat 1311a and the lower cylindrical seat 1312 a. After the torsion strain cylinder 131a is provided with the grooves Ta and Tb, the sectional area is reduced, and therefore, the deformation amount under the same torsion force is increased, so that the shear strain amounts sensed by the strain gauges 132a and 132b are larger and the calculated output torsion force is more accurate.
Finally, please refer to fig. 2, 12 and 13 together, wherein fig. 12 is a perspective view illustrating a torque sensing assembly according to a third embodiment of the present invention; and, fig. 13 is a cross-sectional view showing D-D of fig. 12. As shown in the figure, a torsion sensing assembly 13b includes a torsion strain cylinder 131b and strain gauges 132a and 132b, wherein the strain gauges 132a and 132b are the same as the arrangement manner and the manner of sensing the shear strain amount in the first embodiment, and will not be described in detail.
The torsion strain cylinder 131b includes an upper cylinder seat 1311b, a lower cylinder seat 1312b and an extension part 1313 b. The extension portion 1313b connects the upper cylindrical seat 1311b and the lower cylindrical seat 1312b in the axial direction D1, and has two installation surfaces S1a and S1b facing each other and two opening surfaces S2a and S2b facing each other. As shown in fig. 13, the extending portion 1313b is hollow, and the installation surface S1a is parallel to the installation surface S1b, and the opening surface S2a is parallel to the opening surface S2 b.
In the present embodiment, the strain gauge 132a is disposed on the installation surface S1a, and the strain gauge 132b is disposed on the installation surface S1 b. In the embodiment, the torsion strain cylinder 131b is provided with a through hole Ha and a through hole Hb on the opening surface S2a and the opening surface S2b, respectively, wherein the through hole Ha and the through hole Hb respectively penetrate through the extending portion 1313 b. Unlike the second embodiment, the through holes Ha, Hb do not extend to the upper cylindrical seat 1311b and the lower cylindrical seat 1312 b. The through holes Ha and Hb have weakening effect, so that the output torque calculated by the strain gauges 132a and 132b is more accurate.
In summary, the clutch-type power transmission device and the torque detection module thereof provided by the present invention utilize the strain gauge to be disposed on the torque strain cylinder in a vertical axial direction, compared with the prior art, the strain gauge of the present invention senses a shear strain amount of 45 degrees from the axial direction, which is caused by the torque strain cylinder by the planetary gear set, and calculates the output torque force of the planetary gear set output to the clutch-type power output assembly. The torsion strain cylinder is hollow in structure, and the number of the strain gauges is small, so that the manufacturing process is simple, and the cost is low. In addition, the concentration ratio of the force is dispersed, so that the risk of breakage of the torsion strain cylinder is smaller than that of the prior art, and the service life is longer. In addition, the extension part of the torsion strain cylinder is further provided with a groove or a through hole on the opening surface, so that the effects of reducing the sectional area and improving the deformation under the same torsion are achieved, and the output torsion calculated by the strain gauge is more accurate.
The foregoing detailed description of the preferred embodiments is intended to more clearly illustrate the features and spirit of the present invention, and not to limit the scope of the invention by the preferred embodiments disclosed above. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims.

Claims (12)

1. A torque force detection module of a clutch type power transmission device is arranged on a power source input shaft and a clutch type power output assembly and comprises:
the fixed outer cylinder is arranged between the power source input shaft and the clutch type power output assembly;
the planetary gear set is connected with the clutch type power output assembly;
the power transmission shaft is axially connected with the power source input shaft and the clutch type power output assembly; and
a torque sensing assembly, comprising:
the torsion strain cylinder is sleeved on the power transmission shaft and is respectively fixed on the fixed outer cylinder and the planetary gear set; and
at least one strain gauge which is perpendicular to the axial direction and is arranged on the torsion strain cylinder;
when the clutch mechanism of the clutch type power output assembly is in a just-separated state, the at least one strain gauge senses at least one shear strain amount which is 45 degrees away from the axial direction and is caused by the planetary gear set to the torsion strain cylinder, and accordingly the output torsion of the planetary gear set to the clutch type power output assembly is calculated.
2. The torque detection module of the clutch-type power transmission device according to claim 1, further comprising a display interface electrically connected to the torque sensing assembly for displaying the torque value of the output torque.
3. The torque detection module of the clutch-type power transmission device according to claim 1, further comprising a processing unit electrically connected to the torque sensing assembly for processing the torque value of the output torque, the rotation cycle value of the output torque, and the acting time value of the output torque.
4. The torque detection module of the clutch-type power transmission device according to claim 3, further comprising a warning unit electrically connected to the processing unit for generating a warning message when the output torque triggers a warning condition.
5. The torque detection module of a clutch-type power transmission device according to claim 3, further comprising a storage unit electrically connected to the processing unit for storing torque values of all the output torques, rotation cycle values of all the output torques, and action time values of all the output torques.
6. The torque detection module of the clutch-type power transmission device according to claim 3, further comprising a communication unit electrically connected to the processing unit for communicating at least one of the torque value of the output torque, the rotation cycle value of the output torque, and the acting time of the output torque.
7. The torque detection module of the clutch-type power transmission device according to claim 1, wherein the torque strain cylinder includes:
an upper cylindrical seat adjacent the power source input shaft;
a lower cylindrical seat adjacent the clutch-type power take-off assembly; and
and an extension cylindrical part which is in a hollow cylindrical shape, connects the upper cylindrical seat and the lower cylindrical seat along the axial direction, and has a circumferential wall for the arrangement of the at least one strain gauge.
8. The torque detection module of the clutch-type power transmission device according to claim 1, wherein the torque strain cylinder includes:
an upper cylindrical seat adjacent the power source input shaft;
a lower cylindrical seat adjacent the clutch-type power take-off assembly; and
and the extension part is hollow, is connected with the upper cylinder seat and the lower cylinder seat along the axial direction, and is provided with two opposite installation surfaces and two opposite opening surfaces, and the plurality of installation surfaces are provided for the arrangement of the at least one strain gauge.
9. The torque force detecting module for a clutch-type power transmission device according to claim 8, wherein the extension portion has a groove formed on each of the plurality of opening surfaces, and the grooves extend to the upper cylindrical seat and the lower cylindrical seat.
10. The torque force detection module of the clutch type power transmission device according to claim 8, wherein the extension portion has through holes on the plurality of opening surfaces, and the through holes penetrate through the extension portion.
11. The torque force detection module of the clutch-type power transmission device according to claim 8, wherein the plurality of installation surfaces are parallel to each other, and the plurality of opening surfaces are parallel to each other.
12. A clutch type power transmission device comprising:
a power source having a power source input shaft;
a clutched power output assembly;
the torsion detection module is arranged between the power source and the clutch type power output assembly and comprises:
the fixed outer cylinder is arranged between the power source input shaft and the clutch type power output assembly;
the planetary gear set is connected with the clutch type power output assembly;
the power transmission shaft is axially connected with the power source input shaft and the clutch type power output assembly; and
a torque sensing assembly, comprising:
the torsion strain cylinder is sleeved on the power transmission shaft and is respectively fixed on the fixed outer cylinder and the planetary gear set; and
at least one strain gauge which is perpendicular to the axial direction and is arranged on the torsion strain cylinder;
when the clutch mechanism of the clutch type power output assembly is in a just-separated state, the at least one strain gauge senses at least one shear strain amount which is 45 degrees away from the axial direction and is caused by the planetary gear set to the torsion strain cylinder, and accordingly the output torsion which is output to the clutch type power output assembly by the planetary gear set is calculated.
CN202110216620.9A 2021-02-26 2021-02-26 Clutch type power transmission device and torsion detection module thereof Pending CN114952693A (en)

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