CN216717663U - Force sensor for middle shaft - Google Patents
Force sensor for middle shaft Download PDFInfo
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- CN216717663U CN216717663U CN202123324787.1U CN202123324787U CN216717663U CN 216717663 U CN216717663 U CN 216717663U CN 202123324787 U CN202123324787 U CN 202123324787U CN 216717663 U CN216717663 U CN 216717663U
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Abstract
The present application provides a force sensor for a bottom bracket, comprising: the device comprises a middle shaft, an output shaft sleeve for mounting a chain wheel, a tested piece, a collecting device and a resetting piece; the output shaft is sleeved on the middle shaft; the measured piece is positioned between the middle shaft and the output shaft sleeve; the resetting piece is arranged on the middle shaft, a component force structure is arranged between the middle shaft and the measured piece, when the middle shaft transmits a circumferential force to the measured piece, an axial force can be generated through the component force structure, and the axial force pushes the measured piece to overcome the resetting force to slide; the acquisition device is used for recording the moving distance of the measured piece. Compared with the related art, the force sensor for the middle shaft has the advantages of simple mechanical structure, low requirement on the material of the middle shaft, simple and durable circuit and high response speed, and has better applicability while reducing the maintenance and installation cost and the manufacturing cost.
Description
Technical Field
The application relates to the technical field of bicycles and electric bicycles, in particular to a force sensor for a middle shaft.
Background
In the process of riding the bicycle, the riding force applied to the pedals by a rider is transmitted to the middle shaft through the crank to drive the middle shaft to rotate, the middle shaft drives the chain wheel connected with the middle shaft to rotate, and finally the chain wheel drives the wheels to rotate through the chain and the flywheel to realize the riding action.
The force sensor for the middle shaft is used for measuring the difference between the input force (riding force) of the middle shaft from the crank and the output force transmitted to the chain wheel by the middle shaft. The mode that the force sensor among the correlation technique measures the difference between input force and output force requires for the material of axis higher, and force sensor's self circuit structure is comparatively complicated, and the suitability is relatively poor.
SUMMERY OF THE UTILITY MODEL
In view of this, an object of the present application is to provide a force sensor for a middle axle, so as to solve the problems of a complicated structure and poor applicability of the middle axle force sensor in the related art.
In view of the above, the present application provides a force sensor for a bottom bracket, comprising: the device comprises a middle shaft, an output shaft sleeve for mounting a chain wheel, a tested piece, a collecting device and a resetting piece; the output shaft sleeve is sleeved on the middle shaft; the tested piece is positioned between the middle shaft and the output shaft sleeve and is used for transmitting the circumferential force of the middle shaft to the output shaft sleeve; the reset piece is arranged on the middle shaft and used for providing reset force when the measured piece axially slides along the middle shaft; a component structure is arranged between the middle shaft and the measured piece, and when the middle shaft transmits a circumferential force to the measured piece, an axial force can be generated through the component structure; the axial force pushes the tested piece to slide against the reset force; the acquisition device is used for recording the moving distance of the measured piece.
Further, the component force structure comprises a chute, a spiral groove, a thread or a spiral spline which is axially arranged on the middle shaft, and a structure which is arranged on the measured piece and matched with the chute, the spiral groove, the thread or the spiral spline.
Further, the inclination angle of the inclined groove relative to the axis of the middle shaft, the helix angle of the helical groove, the helix angle of the thread and the helix angle of the helical spline are greater than or equal to 5 degrees and smaller than 90 degrees.
Further, the tested piece is fixedly connected with permanent magnet steel; the acquisition device is a Hall displacement sensor arranged at an interval with the middle shaft; the Hall displacement sensor is used for detecting and recording the displacement of the permanent magnet steel.
Furthermore, the reset piece is a spring or opposite magnetic steel corresponding to the permanent magnetic steel, and the elastic force generated by the spring or the repulsive force generated by the opposite magnetic steel and the permanent magnetic steel is not less than the static friction force between the measured piece and the central shaft.
Furthermore, the measured part is a cylindrical structure sleeved on the middle shaft, and the permanent magnet steel is an annular structure arranged on the outer side of the cylindrical structure.
Furthermore, the middle shaft is provided with a spiral groove, and a first transmission roller extending into the spiral groove is embedded in the inner wall of the measured piece.
Furthermore, a middle shaft shoulder is arranged at the position of the middle shaft close to the collecting device, and a shaft clamp spring which is spaced from the middle shaft shoulder is further installed on the middle shaft; the tested part, the reset part and the output shaft sleeve are arranged between the shaft shoulder of the middle shaft and the clamp spring for the shaft; the inner hole of the output shaft sleeve is a stepped hole, and the stepped hole sequentially comprises a first hole section for accommodating the tested piece, a second hole section for accommodating the reset piece and a third hole section for matching with the middle shaft from the shaft shoulder of the middle shaft to the direction of the shaft clamp spring; the pore diameters of the first pore section, the second pore section and the third pore section are sequentially reduced; the reset piece is a spring sleeved on the middle shaft; when the measured piece is static, one end of the measured piece is abutted against the shaft shoulder of the middle shaft, and the other end of the measured piece is abutted against the end part of the second hole section through the resetting piece; the output shaft sleeve is abutted to the snap spring for the shaft.
Furthermore, a strip-shaped through hole extending along the axial direction is formed in the inner wall of the first hole section of the output shaft sleeve, and a second transmission roller extending into the strip-shaped through hole is embedded in the outer wall of the tested piece; the outer side of the output shaft sleeve is sleeved with a protective sleeve, and the inner diameter of the protective sleeve is matched with the outer diameter of the output shaft sleeve and used for keeping the second transmission roller in the strip-shaped through hole.
Furthermore, the middle shaft is provided with a first bearing, the output shaft sleeve is provided with a second bearing, a middle shaft sleeve is arranged between the outer ring of the first bearing and the outer ring of the second bearing, and the acquisition device is arranged on the inner side of the middle shaft sleeve.
From the above, the force sensor for the middle shaft provided by the application adopts the force decomposition principle, the middle shaft generates measurable axial force in the circumferential force transmission process through the component force structure, and the ratio of the interaction force between the middle shaft and the measured piece to the axial force is fixed; after the axial force is calculated through the reset piece and the collecting device, the interaction force can be obtained, and then the difference value between the input force and the output force transmitted by the middle shaft is obtained. Compared with the prior art, the force sensor for the middle shaft has the advantages that the mechanical structure is simple, the requirement on the material of the middle shaft is low, the circuit is simple and durable, the response speed is high, the maintenance and installation cost and the manufacturing cost are reduced, and meanwhile, the force sensor for the middle shaft has good applicability.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a force sensor for a bottom bracket axle according to an embodiment of the present application;
FIG. 2 is a schematic drawing in partial cutaway of a force sensor for a bottom bracket axle of an embodiment of the present application;
FIG. 3 is a cross-sectional view of a force sensor for a bottom bracket axle in an embodiment of the present application;
FIG. 4 is a schematic diagram of a force sensor for a bottom bracket axle according to an embodiment of the present application.
Description of reference numerals:
1. a middle shaft; 1-1, a middle shaft shoulder; 1-2, input end;
2. an output shaft sleeve; 2-1, a first bore section; 2-1-1, strip-shaped through holes; 2-2, a second pore section; 2-3, a third hole section; 2-4, output end;
3. a measured piece; 3-1, permanent magnet steel;
4. a collection device;
5. a reset member;
6. a force component structure; 6-1, a chute; 6-2, a first drive roller;
7. a clamp spring for the shaft; 8. a second transmission roller; 9. a protective sleeve; 10. a first bearing; 11. a second bearing; 13. and a middle shaft sleeve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings in combination with specific embodiments.
It should be noted that technical terms or scientific terms used in the embodiments of the present application should have a general meaning as understood by those having ordinary skill in the art to which the present application belongs, unless otherwise defined. As used in this application, the terms "first," "second," and the like, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
As described in the background section, the measurement method of the middle shaft force sensor in the prior art is to measure the stress deformation of the middle shaft. The small elastic deformation of the middle shaft after the riding force is applied to the middle shaft is measured after signal amplification and isolated transmission, and then the force applied to the middle shaft is obtained. If the method is adopted for measurement, the requirement on the material of the centering shaft is more special and severe. Meanwhile, the circuit structure of the signal amplification and transmission system is complex, the cost is high, and the axial force sensor is difficult to popularize and apply.
As shown in fig. 1, 2, 3 and 4, the force sensor for the bottom bracket 1 according to the embodiment of the present application includes: the device comprises a central shaft 1, an output shaft sleeve 2 for mounting a chain wheel, a tested piece 3, a collecting device 4 and a resetting piece 5; the output shaft sleeve 2 is sleeved outside the middle shaft 1; the measured piece 3 is positioned between the middle shaft 1 and the output shaft sleeve 2 and is used for transmitting the circumferential force of the middle shaft 1 to the output shaft sleeve 2; the reset piece 5 is arranged on the middle shaft 1 and used for providing reset force when the tested piece 3 axially slides along the middle shaft 1; a component structure 6 is arranged between the middle shaft 1 and the measured piece 3, and when the middle shaft 1 transmits a circumferential force F to the measured piece 31When the axial force F is generated by the component structure 62(ii) a Axial force F2Pushing the tested piece 3 to slide against the reset force; the acquisition device 4 is used for recording the moving distance of the measured piece 3.
As shown in FIG. 1, the two ends of the middle shaft 1 are input ends 1-2, which are connected with the crank. The output shaft sleeve 2 is provided with output ends 2-4 which are connected with the chain wheel.
Initially, the middle shaft 1, the measured piece 3 and the output shaft sleeve 2 are all in a static state. A rider or a tester transmits input force (which can be understood as riding force of pedaling of the rider) to the middle shaft 1 through the crank, the input force is circumferential force, and the middle shaft 1 generates a rotation trend under the action of the input force and is changed from a static state to a rotation state. The middle shaft 1 transmits the input force to the static measured part 3 through the force splitting structure 6 so as to drive the measured part 3 to be converted from a static state to a rotating state. Between the central shaft 1 and the measured part 3, the central shaft 1 is a force applying part, the measured part 3 is a force receiving part, and the measured part 3 lags behind the central shaft 1 to generate an interaction force F between the two1The interaction force F1Is used for increasing the rotating speed of the measured piece 3 until the measured piece 3 rotates synchronously with the middle shaft 1. When the measured part 3 is static, the interaction force F between the middle shaft 1 and the measured part 31To a maximum, the interaction force F increases with increasing rotational speed of the piece 3 to be measured1Gradually decreases, the interaction force F is generated when the rotation speed of the measured piece 3 is the same as that of the middle shaft 11Is 0. In other words, the interaction force F1Namely the difference value of the input force and the output force between the central shaft 1 and the measured piece 3.
Force sensor of the present embodiment for measuring interaction force F1 A component structure 6 is arranged between the middle shaft 1 and the measured piece 3, so that the interaction force F1During the process of transmitting the component force structure 6 from the middle shaft 1 to the measured part 3, an axial force F acting on the measured part 3 is generated2And axial force F2With interaction force F1Is fixed, in other words when the axial force F is measured2The input force F can be obtained by calculation1。
To measure axial force F2The force sensor of the present embodiment is provided with a reset piece 5 and a pickup unit 4. Axial force F of the measured part 32When the axial sliding is performed under the action of (1), the distance between the axial sliding and the resetting member 5 is changed, and the relationship between the resetting force generated by the resetting member 5 (i.e. the force for driving the tested member 3 to return to the original position) and the distance variation is known, so that the resetting force generated by the resetting member 5, namely the axial force F of the tested member 3 can be obtained as long as the displacement distance of the tested member 3 relative to the resetting member 5 is measured2. And the displacement distance of the measured piece 3 can be acquired by the acquisition device 4.
Since only the circumferential force transmission relationship exists between the measured member 3 and the output shaft sleeve 2, the measured member 3 and the output shaft sleeve 2 can be regarded as a whole. In other words, the interaction force F between the measured part 3 and the central axis 11The difference between the input force and the output force is equal to the interaction force between the middle shaft 1 and the output shaft sleeve 2, namely the difference between the circumferential input force applied to the middle shaft and the output force transmitted to the chain wheel by the middle shaft.
The force sensor for the middle shaft 1 provided by the embodiment of the application adopts the force decomposition principle, and the force component structure 6 enables the middle shaft 1 to generate measurability in the circumferential force transmission processAxial force F2And the interaction force F between the middle shaft 1 and the measured piece 31With axial force F2The proportion between the two is fixed; the axial force F is calculated by the restoring element 5 and the pick-up device 42After that, the interaction force F can be obtained1And thus the difference between the input force and the output force transmitted through the central shaft 1 is obtained. Compared with the prior art, the force sensor for the middle shaft 1 provided by the embodiment of the application has the advantages of simple mechanical structure, low requirement on the material of the middle shaft 1, simple and durable circuit and high response speed, and has better applicability while reducing the maintenance and installation cost and the manufacturing cost.
Referring to fig. 3, in some embodiments, the force distribution structure 6 includes a tapered slot 6-1, a spiral groove, a thread or a spiral spline, which is axially disposed on the middle shaft 1, and a structure disposed on the measured member 3 and engaged with the tapered slot 6-1, the spiral groove, the thread or the spiral spline.
In order to generate axial force during the transmission process of circumferential force, a certain included angle is required between the central line of the transmission structure between the middle shaft 1 and the measured piece 3 and the axis of the middle shaft 1.
As shown in fig. 3, the chute 6-1 is selected as the force component structure 6 for ease of understanding. In the selected structure, the structure of the measured piece 3 matched with the chute 6-1 is a bulge connected with the measured piece 3 in an integrated forming way, a pin or a roller inserted or embedded in the measured piece 3 through a hole, and the bulge, the pin or the roller extends into the chute 6-1. When the middle shaft 1 pushes the matching structure on the measured piece 3 through the inclined groove 6-1, the matching structure slides along the inclined groove 6-1, the measured piece 3 moves along the inclined groove 6-1 under the driving of the matching structure, namely, the measured piece 3 is axially moved by the axial force while being rotated by the circumferential force.
As shown in fig. 3 and 4, in some embodiments, the inclination angle of the inclined groove 6-1 with respect to the axis of the bottom bracket axle 1, the helix angle of the helical groove, the helix angle of the helical thread, and the helix angle of the helical spline are greater than or equal to 5 ° and less than 90 °.
When the structure provided on the central axis 1 is the inclined groove 6-1, the angle α in fig. 4 is its inclination angle with respect to the central axis 1. When the structure provided on the middle shaft 1 is a spiral groove, a thread, or a spiral spline, the angle α in fig. 4 is an angle of a helix angle.
As can be seen from FIG. 4, F1＝tanα*F2
By the above formula, the axial force F can be measured2Determining the difference F between the input force and the output force1。
As shown in fig. 2 and 3, in some embodiments, the tested piece 3 is fixedly connected with permanent magnet steel 3-1; the acquisition device 4 is a Hall displacement sensor arranged at a distance from the middle shaft 1; the Hall displacement sensor is used for detecting and recording the displacement of the permanent magnet steel 3-1.
A hall displacement sensor is a magnetic sensor based on the hall effect. When the Hall displacement sensor works, the working current of the Hall displacement sensor is kept unchanged, and the output Hall voltage value is only determined by the relative distance between the Hall displacement sensor and the permanent magnet steel 3-1. The Hall displacement sensor can quickly respond to the magnetic field change generated by the slippage of the permanent magnet steel 3-1, and the measurement of the moving distance of the permanent magnet steel 3-1 is realized.
The Hall displacement sensor can be a linear displacement sensor of the 103SR13A series.
In some embodiments, the reset piece 5 is a spring or opposite magnetic steel corresponding to the permanent magnetic steel 3-1, and the elastic force generated by the spring or the repulsive magnetic force generated by the opposite magnetic steel and the permanent magnetic steel 3-1 is not less than the static friction force between the measured piece 3 and the central shaft 1.
The example of the reset piece 5 is a spring, when the tested piece 3 is under the axial force F2When sliding under the action of (3), the tested piece (3) presses or stretches the spring, at the same time, the axial force F2Greater than the spring force generated by the spring. During the contraction or expansion of the spring, the generated elastic force is gradually increased, and the elastic force value is the product of the elastic coefficient of the spring and the contracted or expanded length. When the elastic force and the axial force F2When they are equal, the movement of the object 3 is stopped. At this time, the moving distance of the detected member 3, i.e. the contraction or extension length of the spring, obtained by the collecting device 4 can be used to calculate the elastic force generated by the spring at this time, i.e. the axial force F2。
As shown in FIGS. 2 and 3, the measured piece 3 is a cylindrical structure sleeved on the middle shaft 1, and the permanent magnet steel 3-1 is an annular structure arranged on the outer side of the cylindrical structure.
The cylindrical structure of the object 3 to be measured can stably and uniformly transmit the force, which contributes to the measurement accuracy of the force sensor of the present embodiment. The permanent magnet steel 3-1 is of a magnetic ring structure, so that a stable magnetic field can be generated in the process of rotating along with the measured piece 3, the measurement error of the acquisition device 4 is reduced, and the measurement accuracy and reliability of the force sensor of the embodiment are improved.
In some embodiments, the middle shaft 1 is provided with a spiral groove, and the inner wall of the measured piece 3 is embedded with a first transmission roller 6-2 extending into the spiral groove.
Optionally, the first transmission roller 6-2 is of spherical configuration. When the device is installed, a through hole can be formed in the tested piece 3, and the first transmission roller 6-2 is placed in the through hole. The output shaft sleeve 2 sleeved on the outer side of the tested piece 3 can restrain the first transmission roller 6-2, so that a part of the first transmission roller 6-2 is kept in the spiral groove, and the force transmission between the middle shaft 1 and the tested piece 3 is realized.
Optionally, a plurality of groups of first transmission rollers 6-2 are arranged and uniformly distributed around the tested piece 3;
alternatively, each first transmission roller group includes a plurality of first transmission rollers 6-2 arranged in the axial direction of the member to be measured 3.
When the middle shaft 1 pushes the first transmission roller 6-2 through the spiral groove, the first transmission roller 6-2 slides along the spiral groove, and the measured piece 3 is driven by the first transmission roller 6-2 to move along the spiral groove, namely, the measured piece 3 is axially moved by the axial force while being rotated by the circumferential force.
As shown in fig. 3, in some embodiments, a middle shaft shoulder 1-1 is disposed at a position of the middle shaft 1 close to the acquisition device 4, a shaft snap spring 7 spaced from the middle shaft shoulder 1-1 is further installed on the middle shaft 1, and the detected piece 3, the reset piece 5 and the output shaft sleeve 2 are installed between the middle shaft shoulder 1-1 and the shaft snap spring 7.
The inner hole of the output shaft sleeve 2 is a stepped hole, and the stepped hole sequentially comprises a first hole section 2-1 for accommodating the tested part 3, a second hole section 2-2 for accommodating the reset part 5 and a third hole section 2-3 for being matched with the middle shaft 1 from the middle shaft shoulder 1-1 to the direction of the shaft clamp spring 7. The first, second and third pore sections 2-1, 2-2, 2-3 have successively decreasing pore diameters.
The reset piece 5 is a spring sleeved on the middle shaft 1; when the measured part 3 is static, the measured part 3 keeps an interval with the end part of the second hole section 2-2 through the resetting part 5, one end of the measured part 3, which is far away from the resetting part 5, is abutted against a shaft shoulder 1-1 of the middle shaft, and the output shaft sleeve 2 is abutted against a clamp spring 7 for the shaft.
The positions of the measured piece 3 and the output shaft sleeve 2 on the middle shaft 1 are limited by the middle shaft shoulder 11 and the shaft clamp spring 7, so that the moving range of the measured piece 3 sliding along the axial direction of the middle shaft 1 is further limited, and the sliding range of the measured piece 3 is ensured to be within the effective measuring range of the collecting device 4.
In some embodiments, as shown in fig. 2 and 3, the inner wall of the first hole section 2-1 of the output shaft sleeve 2 is provided with a strip-shaped through hole 2-1-1 extending along the axial direction, and the outer wall of the measured piece 3 is embedded with a second transmission roller 8 extending into the strip-shaped through hole 2-1-1.
The outer side of the output shaft sleeve 2 is sleeved with a protective sleeve 9, the inner diameter of the protective sleeve 9 is matched with the outer diameter of the output shaft sleeve 2, and the protective sleeve is used for keeping the second transmission roller 8 located in the strip-shaped through hole 2-1-1.
The transmission between the tested piece 3 and the output shaft sleeve 2 is realized through the matching between the second transmission roller 8 and the strip-shaped through hole 2-1-1. When the tested piece 3 rotates, the second transmission roller 8 embedded on the tested piece pushes the hole wall of the strip-shaped through hole 2-1-1, so that the output shaft sleeve 2 is driven to rotate.
Because the tested piece 3 has the action of axial movement, the extension length of the strip-shaped through hole 2-1-1 along the axial direction needs to be larger than the axial movement range of the tested piece 3.
In order to maintain the relative position between the protection sleeve 9 and the output sleeve 2, a shoulder may be provided on the output sleeve 2, and the inner bore of the protection sleeve 9 is provided as a stepped bore abutting the shoulder, as shown in fig. 3.
As shown in fig. 1, 2 and 3, in some embodiments, the middle shaft 1 is provided with a first bearing 10, the output shaft sleeve 2 is provided with a second bearing 11, a middle shaft sleeve 13 is arranged between the outer ring of the first bearing 10 and the outer ring of the second bearing 11, and the collecting device 4 is arranged on the inner side of the middle shaft sleeve 13.
When the force sensor of the embodiment is used, the middle shaft sleeve 13 is fixed, and the rotation of the middle shaft 1 and the output shaft sleeve 2 relative to the middle shaft sleeve 13 is realized through the first bearing 10 and the second bearing 11 which are arranged at the two ends of the middle shaft sleeve 13. The middle shaft sleeve 13 can protect the tested piece 3 and the acquisition device 4 which are arranged in the middle shaft sleeve, and the service life of the force sensor of the embodiment is prolonged.
In addition, because the force sensor of this embodiment simple structure, the volume is less, the mountable need not to change current frame structure on the axis of the bicycle of current structure or electric bicycle, has higher suitability and commonality.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.
The description of the present application has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the application in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the application and the practical application, and to enable others of ordinary skill in the art to understand the application for various embodiments with various modifications as are suited to the particular use contemplated.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the context of the present application, features from the above embodiments or from different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of brevity.
The embodiments of the present application are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalents, improvements, and the like that may be made without departing from the spirit or scope of the present application are intended to be included within the scope of the claims.
Claims (10)
1. A force sensor for a bottom bracket, comprising: the device comprises a middle shaft, an output shaft sleeve for mounting a chain wheel, a tested piece, a collecting device and a resetting piece;
the output shaft sleeve is sleeved on the middle shaft; the tested piece is positioned between the middle shaft and the output shaft sleeve and is used for transmitting the circumferential force of the middle shaft to the output shaft sleeve; the reset piece is arranged on the middle shaft and used for providing reset force when the measured piece axially slides along the middle shaft;
a component structure is arranged between the middle shaft and the measured piece, and when the middle shaft transmits a circumferential force to the measured piece, an axial force can be generated through the component structure; the axial force pushes the tested piece to slide against the reset force; the acquisition device is used for recording the moving distance of the measured piece.
2. The force sensor for the middle axle according to claim 1, wherein the force-distributing structure comprises a tapered slot, a spiral groove, a thread or a spiral spline axially disposed on the middle axle, and a structure disposed on the measured member and engaged with the tapered slot, the spiral groove, the thread or the spiral spline.
3. The force sensor for a bottom bracket axle of claim 2, wherein the inclination angle of the diagonal groove with respect to the bottom bracket axle axis, the lead angle of the helical groove, the lead angle of the thread, and the lead angle of the helical spline are equal to or greater than 5 ° and less than 90 °.
4. The force sensor for the bottom bracket axle of claim 1, wherein the measured piece is fixedly connected with permanent magnet steel; the acquisition device is a Hall displacement sensor arranged at an interval with the middle shaft, and the Hall displacement sensor is used for detecting and recording the displacement of the permanent magnet steel.
5. The force sensor for the bottom bracket axle of claim 4, wherein the reset element is a spring or an opposing magnetic steel corresponding to the permanent magnetic steel, and the elastic force generated by the spring or the repulsive force generated by the opposing magnetic steel and the permanent magnetic steel is not less than the static friction force between the measured element and the bottom bracket axle.
6. The force sensor for the middle shaft as claimed in claim 4, wherein the measured member is a cylindrical structure sleeved on the middle shaft, and the permanent magnet steel is an annular structure arranged outside the cylindrical structure.
7. The force sensor for the center shaft according to claim 2, wherein the center shaft is provided with a spiral groove, and a first transmission roller extending into the spiral groove is embedded in the inner wall of the measured member.
8. The force sensor for the middle shaft as claimed in claim 1, wherein a middle shaft shoulder is provided at a position of the middle shaft close to the collecting device, and a shaft clamp spring spaced from the middle shaft shoulder is further installed on the middle shaft; the tested part, the reset part and the output shaft sleeve are arranged between the shaft shoulder of the middle shaft and the clamp spring for the shaft;
the inner hole of the output shaft sleeve is a stepped hole, and the stepped hole sequentially comprises a first hole section for accommodating the tested piece, a second hole section for accommodating the reset piece and a third hole section for matching with the middle shaft from the shaft shoulder of the middle shaft to the direction of the shaft clamp spring; the pore diameters of the first pore section, the second pore section and the third pore section are sequentially reduced;
the reset piece is a spring sleeved on the middle shaft; when the measured piece is static, one end of the measured piece is abutted against the shaft shoulder of the middle shaft, and the other end of the measured piece is abutted against the end part of the second hole section through the resetting piece; the output shaft sleeve is abutted to the shaft snap spring.
9. The force sensor for the middle axle according to claim 8, wherein the inner wall of the first hole section of the output shaft sleeve is provided with a strip-shaped through hole extending along the axial direction, and a second transmission roller extending into the strip-shaped through hole is embedded in the outer wall of the measured piece;
the outer side of the output shaft sleeve is sleeved with a protective sleeve, and the inner diameter of the protective sleeve is matched with the outer diameter of the output shaft sleeve and used for keeping the second transmission roller in the strip-shaped through hole.
10. The force sensor for the middle shaft according to claim 1, wherein the middle shaft is provided with a first bearing, the output shaft sleeve is provided with a second bearing, a middle shaft sleeve is arranged between an outer ring of the first bearing and an outer ring of the second bearing, and the collecting device is arranged on the inner side of the middle shaft sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123324787.1U CN216717663U (en) | 2021-12-29 | 2021-12-29 | Force sensor for middle shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123324787.1U CN216717663U (en) | 2021-12-29 | 2021-12-29 | Force sensor for middle shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216717663U true CN216717663U (en) | 2022-06-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123324787.1U Active CN216717663U (en) | 2021-12-29 | 2021-12-29 | Force sensor for middle shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216717663U (en) |
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2021
- 2021-12-29 CN CN202123324787.1U patent/CN216717663U/en active Active
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