CN109178186B - Reverse magnetostriction center shaft moment sensor - Google Patents
Reverse magnetostriction center shaft moment sensor Download PDFInfo
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- CN109178186B CN109178186B CN201811315336.1A CN201811315336A CN109178186B CN 109178186 B CN109178186 B CN 109178186B CN 201811315336 A CN201811315336 A CN 201811315336A CN 109178186 B CN109178186 B CN 109178186B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
- B62M6/45—Control or actuating devices therefor
- B62M6/50—Control or actuating devices therefor characterised by detectors or sensors, or arrangement thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0009—Force sensors associated with a bearing
- G01L5/0023—Force sensors associated with a bearing by using magnetic sensors
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- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a reverse magnetostriction center shaft moment sensor, which comprises: the middle shaft comprises a shaft sleeve, end components sealed at two ends of the shaft sleeve and a mandrel capable of penetrating the shaft sleeve, the shaft sleeve and the end components are embedded and installed in the five-way, and the mandrel is used for fixedly connecting a left crank and a right crank; the strain sleeve is fixedly sleeved on the outer peripheral side of the mandrel in the circumferential direction and is provided with a magnetostriction part; and the induction coil is circumferentially movably sleeved on the outer peripheral side of the magnetostriction part and is fixed with the shaft sleeve and used for sensing the change of the magnetic conductivity of the strain sleeve. The inverse magnetostriction center shaft moment sensor can be directly installed and applied to the existing general structure, and has ideal universality, sensitivity and sensing precision.
Description
Technical Field
The invention belongs to the technical field of sensors, and particularly relates to a reverse magnetostriction center shaft moment sensor.
Background
The electric bicycle is a kind of riding bicycle based on bicycle structure and with electric power driving unit. The electric power-assisted bicycle can provide corresponding power support according to the pedaling force of a rider, so that the riding burden of the rider is reduced, the riding comfort and the riding mileage are greatly increased, and the electric power-assisted bicycle is gradually popular in the market.
The torque sensor is a core component of the electric power-assisted vehicle. The moment sensor is used for sensing and measuring riding moment of a rider and provides a judging basis for power output of the electric driving unit. The moment sensor is a component for sensing the intention of a rider, and the performance of the moment sensor is important.
The existing torque sensor needs to customize and change a center shaft mounting structure and a dental disc and a crank attached to the center shaft, needs to be mounted by using a special mounting tool, cannot be directly mounted and used on the existing center shaft structure, has the defects of poor universality, incapability of realizing quick replacement, high manufacturing and maintenance cost and the like, severely restricts the popularization and application of the torque sensor, and is not beneficial to the quick development of the electric power-assisted vehicle.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the inverse magnetostriction center shaft moment sensor which can be directly installed and applied to the existing general structure and has ideal universality, sensitivity and sensing precision.
The aim of the invention is achieved by the following technical scheme:
a reverse magnetostrictive center shaft torque sensor comprising:
the middle shaft comprises a shaft sleeve, end components sealed at two ends of the shaft sleeve and a mandrel capable of penetrating the shaft sleeve, the shaft sleeve and the end components are embedded and installed in the five-way, and the mandrel is used for fixedly connecting a left crank and a right crank;
the strain sleeve is fixedly sleeved on the outer peripheral side of the mandrel in the circumferential direction and is provided with a magnetostriction part;
and the induction coil is circumferentially movably sleeved on the outer peripheral side of the magnetostriction part and is fixed with the shaft sleeve and used for sensing the change of the magnetic conductivity of the strain sleeve.
As an improvement of the technical scheme, the end assembly comprises a shaft bowl and a support bearing, wherein the shaft bowl is fixed at one end of the shaft sleeve and is embedded and installed in the five-way inner part, and the support bearing is sleeved between the shaft bowl and the mandrel.
As a further improvement of the above technical scheme, the reverse magnetostriction center shaft torque sensor further comprises a magnetic shielding sleeve circumferentially fixedly sleeved on the outer peripheral side of the induction coil.
As a further improvement of the technical scheme, axial gaps are formed between the two ends of the strain sleeve and the mandrel, and the axial gaps are respectively embedded with an axial damping positioning piece in an interference manner; and/or, the inner peripheral surface of the strain sleeve is kept opposite to the outer peripheral surface of the mandrel to form a circumferential gap, and the circumferential gap is embedded with a circumferential damping positioning piece in an interference manner.
As a further improvement of the above technical solution, the magnetostrictive portion includes a plurality of magneto teeth, the magneto teeth are annularly distributed on the outer circumferential surface of the strain sleeve, and the extending directions of the magneto teeth are not parallel to the axial direction of the mandrel.
As a further improvement of the technical scheme, the magnetostriction part is a porous magnetic tube, the porous magnetic tube is fixedly sleeved on the outer peripheral side of the strain sleeve in the circumferential direction, the porous magnetic tube is provided with a plurality of magnetically induced holes distributed in an annular mode, and the extending directions of the magnetically induced holes are not parallel to the axial direction of the mandrel.
As a further improvement of the above technical solution, the magnetostrictive portions are plural and are arranged along the axial direction of the mandrel at intervals, and adjacent magnetostrictive portions have mutually different extending directions.
As a further improvement of the technical scheme, the magnetostrictive portion has an included angle of 45 degrees with the axial direction of the mandrel.
As a further improvement of the above technical solution, the reverse magnetostriction center shaft moment sensor further includes a temperature sensor for detecting a temperature change of the strain sleeve;
and/or the reverse magnetostriction center shaft moment sensor further comprises a rotating speed sensing unit for measuring the rotating speed and/or the direction of the center shaft.
As a further improvement of the technical scheme, the reverse magnetostriction center shaft moment sensor further comprises a magnetic control coil, wherein the magnetic control coil is circumferentially movably sleeved on the outer peripheral side of the magnetostriction part;
and/or the induction coils are plural and are arranged along the axial distance of the mandrel, and the magnetic control coils are arranged between the induction coils.
The beneficial effects of the invention are as follows:
the center shaft comprises a shaft sleeve, end components sealed at two ends of the shaft sleeve and a mandrel capable of penetrating the shaft sleeve, the shaft sleeve and the end components are embedded and installed in the five-way, and the mandrel is used for fixedly connecting a left crank and a right crank, so that the direct installation application on the existing general structure is realized; the direct and accurate moment measurement is realized by the inverse magnetostriction effect between the strain sleeve and the induction coil, the mechanical structure and the compression structure size are simplified, the degree of generality with the existing center shaft structure is further improved, and the sensing precision is ideal.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an exploded structure of a reverse magnetostrictive center shaft torque sensor according to embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of a partial structure of a torque sensor of a reverse magnetostrictive center shaft provided in embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of an assembly structure of the reverse magnetostrictive center shaft torque sensor according to embodiment 1 of the present invention;
FIG. 4 is a schematic cross-sectional view of the torque sensor of the reverse magnetostrictive center shaft according to embodiment 1 of the present invention;
FIG. 5 is a schematic view of a partial structure of the reverse magnetostrictive central axis moment sensor of FIG. 4;
FIG. 6 is a schematic diagram of an applied structure of the reverse magnetostriction center shaft moment sensor provided in embodiment 1 of the present invention;
FIG. 7 is a schematic view of a magnetostrictive portion of the reverse magnetostrictive center shaft torque sensor according to embodiment 1 of the invention;
FIG. 8 is a schematic diagram of a magnetostrictive portion of the reverse magnetostrictive center shaft torque sensor according to embodiment 1 of the invention.
Description of main reference numerals:
1000-inverse magnetostriction center shaft moment sensor, 0100-center shaft, 0110-shaft sleeve, 0120-core shaft, 0130-first end component, 0131-first shaft bowl, 0132-first sealing ring, 0133-first supporting bearing, 0140-second end component, 0141-second shaft bowl, 0142-second sealing ring, 0143-second supporting bearing, 0150-axial damping positioning piece, 0160-circumferential damping positioning piece, 0200-strain sleeve, 0210-magnetic tooth, 0220-porous magnetic tube, 0221-magnetic hole, 0300-induction coil, 0310-magnetic shielding sleeve, 0400-winding tube, 0500-signal processor, 0600-signal transmission line, 0700-magnetic control coil, 0800-rotation speed sensing unit, 0810-speed measuring, 0820-magnet, 0900-output sleeve, 2000-five-way, 3000-left crank, 4000-tooth disc, 5000-right crank.
Detailed Description
In order to facilitate an understanding of the present invention, a more complete description of the reverse magnetostrictive central axis torque sensor will now be provided with reference to the associated drawings. The drawings illustrate a preferred embodiment of the reverse magnetostrictive center axis torque sensor. However, the inverse magnetostrictive central axis torque sensor may be implemented in many different forms and is not limited to the embodiments described herein. Rather, the purpose of these embodiments is to provide a more thorough and complete disclosure of the inverse magnetostrictive central axis torque sensor.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the reverse magnetostrictive central axis torque sensor is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1, the present embodiment discloses a reverse magnetostriction center shaft moment sensor 1000, which includes a center shaft 0100, a strain sleeve 0200 and an induction coil 0300, and is used for realizing direct installation application on the existing general structure, and providing ideal sensitivity and sensing accuracy.
Referring to fig. 2-4 in combination, the center shaft 0100 includes a sleeve 0110, a first end assembly 0130, a second end assembly 0140, and a mandrel 0120 that enclose an annular receiving space for receiving and mounting other structural components. Wherein, the first end component 0130 and the second end component 0140 are respectively sealed at two ends of the sleeve 0110, and the mandrel 0120 rotatably penetrates through the sleeve 0110, the first end component 0130 and the second end component 0140 in sequence.
Referring to fig. 4 and 6 in combination, the sleeve 0110, the first end component 0130 and the second end component 0140 are all embedded in the five-way 2000, and the mandrel 0120 is used for fixedly connecting the left crank and the right crank. In other words, when the reverse magnetostrictive center axis torque sensor 1000 is mounted on the electric bicycle, the sleeve 0110, the first end component 0130 and the second end component 0140 are integrally located inside the five-way 2000, and two ends of the core shaft 0120 protrude outside the five-way 2000 to directly connect the dental tray 4000, the left crank 3000 and the right crank 5000.
The general center shaft has a plurality of structural forms, and commonly comprises a square hole center shaft, a spline center shaft and the like. Thanks to the design of the sleeve 0110, the first end component 0130, the second end component 0140 and the mandrel 0120, the bottom bracket 0100 is designed to be consistent with the universal bottom bracket, and can be completely and interchangeably installed on a bicycle with the universal bottom bracket to reduce the application difficulty. Correspondingly, the five-way valve 2000, the dental tray 4000, the left crank 3000 and the right crank 5000 all directly adopt the existing general structure without modification.
Meanwhile, compared with the middle shaft 0100 structure of some existing torque sensors, the shaft sleeve 0110, the first end component 0130 and the second end component 0140 of the embodiment are all embedded and installed in the five-way 2000, so that the length of the mandrel 0120 is effectively compressed, and the vertical distance between the left crank and the right crank is shortened. The reduction of the vertical distance can effectively increase the number of muscle groups of the rider participating in the exercise on one hand, and is beneficial to the exertion of the rider; on the other hand, the windage resistance can be reduced effectively by reducing the windage area, and the riding limit is improved.
Exemplarily, the first end assembly 0130 comprises a first shaft bowl 0131 and a first support bearing 0133. The first shaft bowl 0131 is fixed at one end of the shaft sleeve 0110 and is embedded and installed at one end of the inside of the five-way pipe 2000. Illustratively, the outer peripheral surface of the first shaft bowl 0131 is matingly coupled to the inner peripheral surface of one end of the five-way tube 2000, including in the form of a threaded connection, a keyed connection, or the like. The first support bearing 0133 is sleeved between the first shaft bowl 0131 and the mandrel 0120 and is used for realizing movement bearing of the mandrel 0120. Illustratively, the first end assembly 0130 further includes a first seal ring 0132 for effecting a seal between the mandrel 0120 and the first shaft bowl 0131.
Illustratively, the second end assembly 0140 includes a second shaft bowl 0141 and a second support bearing 0143. The second shaft bowl 0141 is fixed to the other end of the sleeve 0110 and is fitted into the other end of the inside of the five-way tube 2000. Illustratively, the outer peripheral surface of the second shaft bowl 0141 is matingly coupled with the inner peripheral surface of one end of the five-way tube 2000, including threaded connection, keyed connection, and the like. The second support bearing 0143 is sleeved between the second shaft bowl 0141 and the mandrel 0120 for realizing the motion bearing of the mandrel 0120. Illustratively, the second end assembly 0140 also includes a second seal ring 0142 for achieving a good seal between the mandrel 0120 and the second shaft bowl 0141.
Referring to fig. 1 to 5, the strain sleeve 0200 is fixedly sleeved on the outer circumference side of the mandrel 0120 in a circumferential direction, and has a magnetostrictive portion. The magnetostrictive portion is made of magnetostrictive material and has magnetic telescoping effect. It is understood that by circumferentially fixed it is meant that there is no relative rotation between the strain sleeve 0200 and the mandrel 0120. It will be appreciated that the magnetostrictive portion may be part or all of the strain sleeve 0200, as determined by the needs of the application.
The induction coil 0300 is circumferentially movably sleeved on the outer peripheral side of the magnetostrictive portion and is fixed with the shaft sleeve 0110 for sensing the change of the magnetic permeability of the strain sleeve 0200. It is understood that by circumferential movement is meant that there is relative rotation between the sense coil 0300 and the strain sleeve 0200.
Under the action of the input torque, the strain sleeve 0200 is twisted along with the mandrel 0120, and the magnetostrictive part is twisted synchronously. Due to the inverse magnetostriction effect, the magnetism of the magnetostriction part changes, so that an induction electric signal is generated by an induction coil 0300 which has relative rotation with the magnetostriction part, and the measurement of the change of the magnetic permeability of the magnetostriction part is realized. And according to the induction electric signal, the deformation of the magnetostriction part and the numerical value of the input torque can be calculated.
Illustratively, axial gaps are formed between the two ends of the strain sleeve 0200 and the mandrel 0120, and the axial gaps are respectively embedded with axial damping positioning pieces 0150 in an interference manner. In other words, strain sleeve 0200 is not in direct contact with mandrel 0120 in the axial direction, but rather axial positioning is achieved by axial damping positioner 0150. Wherein, the axial damping positioning element 0150 can be made of elastic metal, rubber, soft plastic, silica gel, etc. Illustratively, the strain sleeve 0200 is interference positioned between both ends and the shoulder of the mandrel 0120 by axial damping locators 0150. Due to the damping and vibration reducing effects of the axial damping positioning piece 0150, axial vibration transmission does not occur between the strain sleeve 0200 and the mandrel 0120, vibration interference is avoided, and sensing accuracy is guaranteed.
Illustratively, the inner circumferential surface of the strain sleeve 0200 is held in opposition to the outer circumferential surface of the mandrel 0120 to form a circumferential gap, which is in interference engagement with the circumferential damping locator 0160. In other words, the strain sleeve 0200 is not in direct contact with the mandrel 0120 in the circumferential (radial) direction, but rather the circumferential (radial) positioning is achieved by the circumferential damping positioning member 0160. Wherein, the circumferential damping positioning member 0160 can be made of elastic metal, rubber, soft plastic, silica gel, etc. Illustratively, the inner peripheral surface of the strain sleeve 0200 has an embedded groove opposite to the outer peripheral surface of the mandrel 0120, and one end of the circumferential damping positioning member 0160 is embedded in the embedded groove in an interference manner, and the other end abuts against the outer peripheral surface of the mandrel 0120 to realize circumferential positioning. Due to the damping and vibration reducing effects of the circumferential damping positioning piece 0160, circumferential vibration transmission does not occur between the strain sleeve 0200 and the mandrel 0120, vibration interference is avoided, and sensing accuracy is guaranteed.
Illustratively, the magnetostriction parts are plural and are arranged along the axial distance of the mandrel 0120, and adjacent magnetostriction parts have mutually different extending directions, so that the differential measurement needs are ensured. Illustratively, the magnetostrictive portion has a 45 ° angle with the axial direction of mandrel 0120. The case includes that one of the two adjacent two has an included angle of 45 degrees, and the other has an included angle of-45 degrees. Numerous implementations of the magnetostrictive portion are described below by way of example only.
Referring to fig. 7, the magnetostrictive portion includes a plurality of magneto teeth 0210, and the magneto teeth 0210 are distributed on the outer circumference of the strain sleeve 0200 in a ring shape. Wherein, the extending direction of the magneto teeth 0210 is not parallel to the axial direction of the mandrel 0120, which ensures that the mandrel has ideal torsional deformation. Illustratively, the direction of extension of magnetocaloric teeth 0210 is at a 45 ° angle to the axial direction of mandrel 0120. The magneto teeth 0210 have a plurality of cross-sectional shapes including triangular, trapezoidal, involute tooth shapes and the like. Illustratively, strain sleeve 0200 is integrally formed with magnetocaloric teeth 0210.
Referring to fig. 8, another example is that the magnetostrictive portion is a porous magnetic tube 0220, and the porous magnetic tube 0220 is circumferentially and fixedly sleeved on the outer peripheral side of the strain sleeve 0200. The porous magnetic tube 0220 has a plurality of magnetic holes 0221 distributed in a ring shape, and the extending direction of the magnetic holes 0221 is not parallel to the axial direction of the mandrel 0120. Exemplarily, the extending direction of the magnetic hole 0221 forms an angle of 45 ° with the axial direction of the mandrel 0120. Under the tubular structure, the magnetic field of the magnetostriction part is continuous, so that uneven torque distribution or magnetic leakage is avoided.
Referring to fig. 6, exemplary induction coils 0300 are plural and are disposed along the axial spacing of mandrel 0120. The plurality of induction coils 0300 respectively sense the magnetic permeability change of the magnetostriction parts to form a differential converter structure, eliminate or reduce consistency errors of the magnetostriction parts and improve sensing precision and linearity.
Illustratively, the reverse magnetostrictive central shaft torque sensor 1000 also includes a magnetic shielding sleeve 0310. The magnetic shielding sleeve 0310 is fixedly sleeved on the outer peripheral side of the induction coil 0300 in the circumferential direction and is used for shielding magnetic interference of the external environment to the induction coil 0300 and guaranteeing the ideal working environment of the induction coil 0300.
Illustratively, the reverse magnetostrictive central axis torque sensor 1000 also includes a magnetic control coil 0700. The magnetic control coil 0700 is circumferentially movably sleeved on the outer peripheral side of the magnetostrictive portion and is used for realizing excitation and demagnetization of the magnetostrictive portion. Illustratively, the reverse magnetostrictive central axis torque sensor 1000 also includes an alternating electrical circuit. The alternating circuit is electrically connected to the magnetic control coil 0700, and is used for switching the magnetic control coil 0700 between the excitation state and the demagnetizing state.
Exemplarily, in the riding state, when the alternating circuit inputs exciting current to the magnetic control coil 0700, the magnetic control coil 0700 provides an additional exciting magnetic field required by the magnetostrictive portion; when the alternating current is input to the magnetic control coil 0700 by the alternating circuit in a stop state, the residual magnetism of the magnetostriction part is eliminated by the magnetic control coil 0700, and the interference on the output precision of the torque sensor is avoided.
Exemplarily, in the case that the induction coils 0300 are plural, the magnetic control coils 0700 are disposed between the induction coils 0300 to form a staggered distribution structure. Under this structure, the magnetic control coil 0700 can synchronously act on the magnetostriction parts corresponding to the plurality of induction coils 0300, so as to ensure better magnetic control effect.
Illustratively, the inverse magnetostrictive central shaft torque sensor 1000 also includes a spool 0400. The spool 0400 is circumferentially movably fitted around the outer peripheral side of the strain tube 0200 and fixed to the boss 0110. The induction coil 0300 is fixedly wound on the outer peripheral surface of the bobbin 0400, and reliable support is realized. The magnetic control coils 0700 are disposed on the outer circumferential surface of the bobbin 0400.
Illustratively, the induction coil 0300 is electrically connected to a signal processor 0500 for performing signal processing on the induction signal of the induction coil 0300 for electrical transmission. The signal processor 0500 may be implemented by an operational amplifier circuit, and may perform basic operations such as calculus, add-subtract-multiply-divide, or basic functions such as signal amplification. The signal processor 0500 is electrically connected to a signal transmission line 0600 for realizing circuit transmission of the sensing signal.
Illustratively, the reverse magnetostrictive central shaft torque sensor 1000 further comprises a rotational speed sensing unit 0800 for measuring the rotational speed and/or direction of the central shaft 0100. The rotation speed sensing unit 0800 may be implemented by mechanical, electrical, magnetic, optical, hybrid methods, and the like.
The rotation speed sensing unit 0800 exemplarily includes a tachometer ring 0810, a magnet 0820, and a tachometer stationary ring. Wherein, the speed measuring moving ring 0810 rotates along with the mandrel 0120, and a plurality of magnets 0820 are embedded on the speed measuring moving ring 0810 along the rotation circumference of the speed measuring moving ring 0810. The speed measuring static ring and the shaft sleeve 0110 are kept static together, and a plurality of Hall sensors are arranged on the speed measuring static ring. Illustratively, the tachometer dead ring may be served by a spool 0400.
As the spindle 0120 rotates, the magnet 0820 rotates with it and the hall sensor remains stationary to produce a hall effect, thereby measuring the rotational speed of the spindle 0120. Meanwhile, the rotation direction of the mandrel 0120 can be judged according to the integration of the measured values among the plurality of Hall sensors. The measurement value of the rotational speed sensor 0800 is a rotational speed vector.
Illustratively, the inverse magnetostrictive central axis torque sensor 1000 also includes a temperature sensor for detecting a temperature change of the strain sleeve 0200. The temperature sensor outputs the measurement result to the controller in an electric signal so that the controller can perform temperature compensation on the sensing result, eliminate the temperature rise deformation interference of the strain sleeve 0200 and ensure the accuracy of the result.
Illustratively, the reverse magnetostrictive center axle torque sensor 1000 also includes an output sleeve 0900 for effecting connection with a sprocket mechanism for effecting power transfer with the front and rear wheels.
Any particular values in all examples shown and described herein are to be construed as merely illustrative and not a limitation, and thus other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.
Claims (8)
1. A reverse magnetostrictive center shaft torque sensor, comprising:
the middle shaft comprises a shaft sleeve, end components sealed at two ends of the shaft sleeve and a mandrel capable of penetrating the shaft sleeve, the shaft sleeve and the end components are embedded and installed in the five-way, and the mandrel is used for fixedly connecting a left crank and a right crank;
the strain sleeve is fixedly sleeved on the outer peripheral side of the mandrel in the circumferential direction and is provided with a magnetostriction part;
the induction coil is circumferentially movably sleeved on the outer peripheral side of the magnetostriction part and fixed with the shaft sleeve and is used for sensing the change of the magnetic conductivity of the strain sleeve;
an axial gap is formed between the two ends of the strain sleeve and the mandrel, and axial damping positioning pieces are respectively embedded in the axial gaps in an interference manner; and/or, the inner peripheral surface of the strain sleeve and the outer peripheral surface of the mandrel are kept opposite to form a circumferential gap, and a circumferential damping positioning piece is embedded in the circumferential gap in an interference manner;
the magnetic control coil is circumferentially movably sleeved on the outer peripheral side of the magnetostriction part; and/or the induction coils are plural and are arranged along the axial distance of the mandrel, and the magnetic control coils are arranged between the induction coils.
2. The counter magnetostrictive central shaft moment sensor according to claim 1, wherein the end assembly comprises a shaft bowl and a support bearing, the shaft bowl is fixed at one end of the shaft sleeve and embedded in the five-way shaft, and the support bearing is sleeved between the shaft bowl and the mandrel.
3. The counter magnetostrictive central shaft torque sensor according to claim 1, further comprising a magnetic shield sleeve circumferentially fixedly sleeved on an outer peripheral side of the induction coil.
4. The counter magnetostrictive central shaft moment sensor according to claim 1, wherein the magnetostrictive portion comprises a plurality of magneto-induced teeth, the magneto-induced teeth are annularly distributed on the outer circumferential surface of the strain sleeve, and the extending directions of the magneto-induced teeth are not parallel to the axial direction of the mandrel.
5. The counter magnetostrictive central shaft moment sensor according to claim 1, wherein the magnetostrictive portion is a porous magnetic tube, the porous magnetic tube is circumferentially and fixedly sleeved on the outer circumferential side of the strain sleeve, the porous magnetic tube is provided with a plurality of annularly distributed magnetic holes, and the extending directions of the magnetic holes are not parallel to the axial direction of the mandrel.
6. The counter magnetostrictive central shaft torque sensor according to claim 1, wherein the magnetostrictive portions are plural and disposed at intervals along the axial direction of the spindle, adjacent magnetostrictive portions having mutually different extending directions.
7. The counter magnetostrictive central shaft torque sensor according to claim 1, wherein the magnetostrictive portion has an angle of 45 ° with the axial direction of the mandrel.
8. The reverse magnetostrictive central axle torque sensor according to claim 1, further comprising a temperature sensor for detecting a temperature change of the strain sleeve; and/or, the device also comprises a rotating speed sensing unit for measuring the rotating speed and/or the direction of the middle shaft.
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| CN110182296B (en) * | 2019-06-28 | 2023-03-28 | 上海云驱智能科技有限公司 | Bicycle center shaft torque detection device |
| CN110207880B (en) * | 2019-07-09 | 2020-10-23 | 东北电力大学 | Multi-connecting-rod type inter-dimension decoupling two-dimensional wireless passive sensor |
| CN111071382A (en) * | 2020-01-13 | 2020-04-28 | 常州拓科智能科技有限公司 | Dynamic and static combined torque sensor of electric power-assisted bicycle |
| CN111693192A (en) * | 2020-07-17 | 2020-09-22 | 珠海市钧兴机电有限公司 | Magnetic flux type torsion sensor |
| CN112572683A (en) * | 2020-12-09 | 2021-03-30 | 宁波麦思动力***有限公司 | Bicycle torque transmission mechanism and system and electric power-assisted bicycle |
| US20230384176A1 (en) * | 2022-05-24 | 2023-11-30 | Giant Manufacturing Co., Ltd. | Torque sensor for a bicycle or an electric bicycle |
| CN115683436B (en) * | 2022-10-12 | 2023-07-14 | 华能广西清洁能源有限公司 | Three-dimensional force sensor based on inverse magnetostriction effect |
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