CN210793496U

CN210793496U - Two-sided torque sensor of moped and moped

Info

Publication number: CN210793496U
Application number: CN201921663763.9U
Authority: CN
Inventors: 许刚华; 陆青; 罗青松
Original assignee: Kunshan Landersen Electrical And Mechanical Technology Co ltd
Current assignee: Kunshan Landersen Electrical And Mechanical Technology Co ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-06-19
Anticipated expiration: 2029-09-30

Abstract

The utility model discloses a two-sided torque sensor of moped and moped, wherein the two-sided torque sensor of moped includes the axis, the cover establish in the axis outside and with axis fixed connection's strain sleeve pipe, with the transmission sleeve pipe of strain sleeve pipe connection, set up strain detection unit, induction coil and the signal processing unit who is connected with the induction coil electricity on the strain sleeve pipe; the induction coil is arranged along the periphery of the strain detection unit; the strain detection unit comprises a plurality of strain detection strips which are uniformly coated on the outer side wall of the strain sleeve along the circumferential direction of the strain sleeve, and the free ends of two ends of every two adjacent strain detection strips are mutually spaced along the circumferential direction of the strain sleeve. The utility model provides the high stability of detecting element that meets an emergency installation on the sleeve pipe that meets an emergency, and improved the sensitivity that the magnetic permeability under the moment of torsion effect of detecting element that meets an emergency changes.

Description

Two-sided torque sensor of moped and moped

Technical Field

The utility model relates to a power assisted bicycle technical field, especially a two-sided torque sensor of power assisted bicycle and power assisted bicycle.

Background

The booster bicycle is a new type two-wheel vehicle, belonging to a kind of bicycle, and using battery as auxiliary power source, and equipped with motor, and possesses power auxiliary system, and can implement manpower riding and motor-assisted integrated new type transportation means. The torque sensor is a core component for understanding the intention of a rider of the electric power-assisted system of the power-assisted bicycle, and the output power of the motor of the electric bicycle can be adjusted according to the measured torque in the riding process due to the existence of the torque sensor, so that the riding comfort is improved.

At present, a torque sensor is increasingly mounted on a center shaft of the power-assisted bicycle, and a common scheme in the industry at present is to paste a strain gauge on a sleeve connected with the center shaft, sense the magnitude of treading torque force through the strain gauge, output a voltage signal after signal processing, and further control the output power of a motor. The scheme has higher requirement on the adhesion of the strain gauge, the transmission modes of power supply and signals are complex, and the hidden trouble of strain gauge peeling is caused under the conditions of long-term dynamic stress and vibration, so that the stability and the reliability of the torque sensor of the scheme are not high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a two-sided torque sensor of moped to solve the technical problem among the prior art, improved the stability of meeting an emergency the detecting element and installing on the lantern ring that meets an emergency, and improved the sensitivity of meeting an emergency the detecting element's magnetic permeability under the moment of torsion effect changes.

The utility model provides a double-sided torque sensor of a power-assisted bicycle, which comprises a center shaft, a strain sleeve which is sleeved outside the center shaft and is fixedly connected with the center shaft, a transmission sleeve which is connected with the strain sleeve, a strain detection unit which is arranged on the strain sleeve, an induction coil and a signal processing unit which is electrically connected with the induction coil; the induction coil is arranged along the periphery of the strain detection unit; the strain detection unit comprises a plurality of strain detection strips which are uniformly coated on the outer side wall of the strain sleeve along the circumferential direction of the strain sleeve, and the free ends of two ends of every two adjacent strain detection strips are mutually spaced along the circumferential direction of the strain sleeve.

As a further improvement, be provided with the edge on the sheathed tube lateral wall of meeting an emergency a plurality of skewed tooth lines that sheathed tube circumference was arranged meet an emergency, the detection strip that meets an emergency is established through scribbling on the skewed tooth line.

As a further improvement of the utility model, the strain detection strip is in projection on the axial section of the strain sleeve with the extending direction of the center shaft is 45 skew.

As a further improvement, the strain detection unit is provided with two, two be provided with the clearance between the strain detection unit.

As a further improvement of the present invention, two the extending direction of the strain detecting strip on the strain detecting unit is not uniform.

As the further improvement of the utility model, two the last strain detection strip of strain detection unit is in projection mutually perpendicular on strain sleeve's the axial section.

As a further improvement of the present invention, the two-sided torque sensor of the power-assisted bicycle further comprises a sleeve, wherein the sleeve is arranged outside the strain sleeve, and the sleeve is provided with a coil fixing groove for installing and fixing the induction coil; the signal processing unit is fixed on the sleeve.

As a further improvement, the two-sided torque sensor of moped still includes the shield cover, the shield cover is established the sheathed tube outside.

As a further improvement of the utility model, the sleeve pipe that meets an emergency has fixed to centraxonial first fixed part and the second fixed part of fixing mutually with the transmission sleeve pipe, first fixed part with the second fixed part is located respectively along the axial the both ends of detection unit that meets an emergency, the transmission sleeve pipe is kept away from the one end of second fixed part is formed with the cooperation portion that is connected with outside sprocket.

The utility model discloses another embodiment still discloses a moped, including above-mentioned bicycle torque sensor, cover establish epaxial first bearing, cover are established drive sleeve's second bearing, cover are established left tooth bowl and cover on the first bearing are established the right tooth bowl of second bearing, a left side tooth bowl with all be provided with on the lateral wall of right tooth bowl and be used for being connected the external screw thread of fixing with the five-way.

Compared with the prior art, the utility model discloses a mode that modern production technology was scribbled and is established sets up magnetic material on the sleeve pipe that meets an emergency in order to form the detecting element that meets an emergency, compares in prior art through pasting its more firm of mode of foil gage on the sleeve pipe that meets an emergency, has avoided coming off that the detecting element appears in long-time use, makes more firm with the combination of the sheathed tube that meets an emergency of detecting element, has improved torque sensor torque detection's reliability and stability. Meanwhile, the detection unit is arranged to be a plurality of strip-shaped strain detection strips which are mutually spaced, the deformation quantity of the strain detection strips is favorably amplified due to the spaced existence, and the two ends of the strain detection strips are arranged to be free ends instead of being fixed on a certain annular component, so that the constraint of deformation of the strain detection strips due to the existence of the annular component is avoided, and the magnetic permeability change sensitivity of the strain detection unit under the action of torque is further improved.

Drawings

Fig. 1 is a schematic view of an internal structure of a double-sided torque sensor of a power-assisted bicycle according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a projection of a strain detection unit and a middle axle of the power-assisted bicycle double-sided torque sensor on a plane after being fixed in a first embodiment disclosed in the embodiment of the present invention;

fig. 3 is a schematic structural view of a projection of a strain detection unit and a middle axle of a two-sided torque sensor of a power-assisted bicycle on a plane after being fixed in a second embodiment disclosed in the embodiment of the present invention;

fig. 4 is an isometric view of a double-sided torque sensor of a power-assisted bicycle disclosed in an embodiment of the present invention;

fig. 5 is a schematic structural view of a middle shaft in a double-sided torque sensor of a power-assisted bicycle disclosed in an embodiment of the present invention;

fig. 6 is a schematic structural view of a strain sleeve in a double-sided torque sensor of a power-assisted bicycle according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a transmission sleeve in a double-sided torque sensor of a power-assisted bicycle according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a strain sleeve with helical serrations on the outer side wall in a double-sided torque sensor for a power-assisted bicycle disclosed in an embodiment of the present invention;

description of reference numerals: 1-middle shaft, 11-meshing part, 2-strain detection unit, 21-strain detection strip, 3-induction coil, 4-signal processing unit, 5-sleeve, 51-coil fixing groove, 6-shielding cover, 7-strain sleeve, 71-first fixing part, 72-second fixing part, 73-skewed tooth pattern, 8-transmission sleeve, 81-matching part, 82-third fixing part, 100-first bearing, 200-second bearing, 300-left dental cup and 400-right dental cup.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

The embodiment of the utility model discloses a two-sided torque sensor of moped, it is shown with reference to fig. 1-7, establish including axis 1, cover axis 1 outside and with axis 1 fixed connection strain sleeve pipe 7, with transmission sleeve pipe 8, the setting that strain sleeve pipe 7 is connected are in strain detection unit 2, induction coil 3 on the sleeve pipe 7 and with signal processing unit 4 that 3 electricity of induction coil are connected. The induction coil 3 is arranged along the periphery of the strain detection unit 2, the induction coil 3 is opposite to the strain detection unit 2 in position so that the induction coil 3 can detect the magnetic change of the strain detection unit 2, the induction coil 3 transmits the induced magnetic change signal to the signal processing unit 4, the signal processing unit 4 obtains the magnitude of the moment on the strain sleeve 7 according to the magnetic change, the strain sleeve 7 is fixedly connected with the middle shaft 1, the torque on the middle shaft 1 is transmitted out through the strain sleeve 7, and the magnitude of the moment on the strain sleeve 7 can reflect the magnitude of the moment on the middle shaft. The strain detection unit 2 comprises a plurality of strain detection strips 21 which are uniformly coated on the outer side wall of the strain sleeve 7 along the circumferential direction of the strain sleeve 7, and two ends of each strain detection strip 21 are free ends. The plurality of strain detection bars 21 are provided at regular intervals in the circumferential direction of the strain sleeve 7 so that the amount of deformation of each portion of the strain detection bar 21 is the same when the strain detection unit 2 receives the acting force of the strain sleeve 7. The strain detection strip 21 is arranged along the outer side wall of the strain sleeve 7 in a strip shape, and the change of the magnetic permeability caused by the deformation of the strain detection strip 21 can be conveniently detected through the strip shape. In this embodiment, the strain gauge strip 21 is made of a magnetic material. The mode of coating through modern production technology sets up magnetic material on strain sleeve pipe 7 in order to form strain detection unit 2, compares in prior art through pasting its more firm of mode of foil gage on strain sleeve pipe 7, has avoided the drop that the detecting element appears in long-time use, makes detecting element 2 and strain sleeve pipe 7's combination more firm, has improved torque sensor torque detection's reliability and stability.

In addition, in another embodiment, as shown in fig. 8, a plurality of helical serrations 73 arranged along the circumferential direction of the strain sleeve 7 are arranged on the outer side wall of the strain sleeve 7, the strain detection strip 21 is coated on the helical serrations 73 by the existing production process, and the vertical cross section of the helical serrations 73 has a triangular, rectangular, trapezoidal or involute tooth shape.

The both ends of axis 1 are provided with respectively and are used for dismantling the crank installation department of being connected with the crank of bicycle, and the pedal installation of bicycle is fixed to the crank, drives axis 1's rotation through the pedal at the in-process of riding. Meanwhile, the torque borne by the middle shaft 1 is transmitted to the strain sleeve 7, the strain sleeve 7 is transmitted to the chain wheel through the transmission sleeve 8, and then the pedaling force is transmitted to the rear wheel through the matching of the chain wheel and the chain. When the bicycle is pedaled in the process of riding the power-assisted bicycle, the central shaft 1 is subjected to circumferential torque, and the torsional torque drives the strain detection strip 21 on the strain sleeve 7 to deform, so that the magnetic conductivity of the strain detection strip 21 changes, the magnetic field around the induction coil 3 changes, and the induced electromotive force of the induction coil 3 changes. The signal processing unit 4 can obtain the magnitude of the torque received by the strain sleeve 7 according to the change of the induced electromotive force.

The utility model discloses set up detecting element 2 into a plurality of strain detection strip 21 mutual intervals that are strip, the alternate existence also is favorable to enlargiing the deformation volume of strain detection strip 21 to make the both ends of strain detection strip 21 set up to the free end and not fix on certain annular part, avoided the constraint of the existence of annular part to strain detection strip 21 deformation, thereby further improve strain detection element 2's magnetic permeability change sensitivity under the moment of torsion effect.

In this embodiment, the two free ends of two adjacent strain detection bars 21 are spaced from each other along the circumferential direction of the strain sleeve 7. The ends of all the strain detection strips 21 on the same side are arranged along the circumferential direction of the strain sleeve 7. Specifically, the strain detection bars 21 may be provided in a parallelogram structure.

Preferably, as shown in fig. 2 or 3, a projection of the strain detection bar 21 on the axial section of the strain sleeve 7 is inclined at 45 ° to the extending direction of the strain sleeve 7. The arrangement of the structure is that the strain detection strip 21 is arranged at the position where the strain sleeve 7 deforms most under the action of torque, so that when the strain sleeve 7 of the middle shaft 1 is twisted by the torque, the deformation amount generated by the strain detection strip 21 changes most, the magnetic permeability change sensitivity of the surface of the strain detection unit 2 under the action of the torque can be improved, and the optimal detection result is realized. Of course, the angle of intersection between the projection of the strain detection strip 21 on the axial cross section of the strain sleeve 7 and the extending direction of the strain sleeve 7 may also be set to be other angles, or the extension direction of the strain detection strip 21 may also be parallel to the extending direction of the strain sleeve 7, which is not further limited herein, and the strain detection strip 21 may be set as long as the magnetic permeability can be changed under the effect of the applied torque.

In order to further improve the sensitivity of the strain detecting elements 2 to changes in magnetic permeability under torque, as shown in fig. 2 and 3, two strain detecting elements 2 are provided, and a gap is provided between the two strain detecting elements 2. The extension directions of the strain detection bars 21 on the two strain detection units 2 are not the same. Specifically, the projections of the strain detection strips 21 on the two strain detection units 2 on the axial cross section of the strain sleeve 7 are perpendicular to each other, and the strain detection strips 21 on the two strain detection units 2 are symmetrically arranged relative to the gap. In the first embodiment, as shown in fig. 2, the inclination directions of the two strain detection bars 21 are directed in directions away from each other, forming a shape similar to a herringbone structure. In the second embodiment, as shown in fig. 3, the two strain detection bars 21 are inclined to point to one side of the position where they are located with respect to each other to form a shape similar to a V-shaped structure. When the strain sleeve 7 is subjected to circumferential torsional force, the strain detection strips 21 on the two strain detection units 2 deform in opposite directions, so that the induction coil 3 can acquire two magnetic permeability change data, and the two magnetic permeability change data can be verified mutually, so that the accuracy of the data is ensured, and the magnetic permeability change sensitivity of the surface of the strain detection unit 2 under the action of torque is improved.

The double-sided torque sensor of the power-assisted bicycle further comprises a sleeve 5, wherein the sleeve 5 is sleeved on the outer side of the middle shaft 1, and a coil fixing groove 51 for installing and fixing the induction coil 3 is formed in the sleeve 5; the signal processing unit 4 is fixed to the casing 5. The coil fixing groove 51 is located opposite to the strain detecting unit 2. The coil fixing grooves 51 are provided in plural according to the number of the induction coils 3. In the present embodiment, two strain detection units 2 are provided, and therefore the number of coil fixing grooves 51 is two. In addition, the sleeve 5 is provided with a circuit board fixing slot for mounting and fixing a circuit board, and the signal processing unit 4 in this embodiment is arranged on the circuit board.

Further, in order to improve the magnetic interference resistance of the induction coil 3, the double-sided torque sensor of the moped further comprises a shielding cover 6, the shielding cover 6 is sleeved on the outer side of the sleeve 5, and the shielding cover 6 is opposite to the induction coil 3. The shield case 6 has a cylindrical shape in the present embodiment and is made of an electromagnetic shield material. The induction coil 3 is covered by the shielding case 6 at least, the shielding case 6 plays a role of magnetic shielding for the induction coil 3, the anti-magnetic interference capability of the induction coil 3 can be improved, and the induction coil can be prevented from being damaged mechanically.

In this embodiment, as shown in fig. 5 to 7, the strain sleeve 7 has a first fixing portion 71 fixed to the middle shaft 1 and a second fixing portion 72 fixed to the transmission sleeve 8, the first fixing portion 71 and the second fixing portion 72 are respectively located at two ends of the strain detecting unit 2 along the axial direction, a matching portion 81 connected to an external sprocket is formed at one end of the transmission sleeve 8 away from the second fixing portion 72, and a third fixing portion 82 matched with the second fixing portion 72 is disposed at one end of the transmission sleeve 8 facing the strain sleeve 7. In the present embodiment, the first fixing portion 71 is configured as an annular gear, and a meshing portion 11 that is matched and fixed with the annular gear 22 is formed at a position of the middle shaft 1 corresponding to the annular gear; the second fixing portion 72 is provided as an outer ring gear, and the third fixing portion 82 is formed with an inner ring gear that is engaged and fixed with the outer ring gear of the second fixing portion 72. The fitting portion 81 is provided to be fitted to the meshing outer ring gear of the sprocket. In the riding process, the pedal drives the middle shaft 1 to rotate. Meanwhile, the torque borne by the middle shaft 1 is transmitted to the strain sleeve 7, the strain sleeve 7 is transmitted to the chain wheel through the transmission sleeve 8, the torsion of the pedals is transmitted through the strain sleeve 7 and the transmission sleeve 8, and the transmission sleeve 8 is connected with the chain wheel, so that the magnitude of the torque borne by the middle shaft 1 can be detected through the strain detection part on the strain sleeve 7 no matter the left pedal or the right pedal is used for exerting force. And fix the sprocket through the drive sleeve 8 instead of fixing the sprocket on the strain sleeve 7 directly then can effectually avoid external force to impact the strain sleeve 7 along the axial of strain sleeve 7 and bring the inaccuracy that detects. The strain sleeve 7 and the transmission sleeve 8 can effectively buffer the strain sleeve 7 by external force through the matching of the inner gear ring and the outer gear ring, so that the strain sleeve 7 is better protected.

The application also discloses moped, establish including foretell bicycle torque sensor, cover first bearing 100, cover are established on axis 1 second bearing 200, cover on the transmission sleeve 8 are established left tooth bowl 300 and cover on the first bearing 100 are established right tooth bowl 400 on the second bearing 200, left side tooth bowl 300 with all be provided with on the lateral wall of right tooth bowl 400 and be used for being connected the external screw thread of fixing with the five-way.

The structure, features and effects of the present invention have been described in detail above according to the embodiment shown in the drawings, and the above description is only the preferred embodiment of the present invention, but the present invention is not limited to the implementation scope shown in the drawings, and all changes made according to the idea of the present invention or equivalent embodiments modified to the same changes should be considered within the protection scope of the present invention when not exceeding the spirit covered by the description and drawings.

Claims

1. A double-sided torque sensor of a power-assisted bicycle comprises a center shaft, a strain sleeve, a transmission sleeve, a strain detection unit, an induction coil and a signal processing unit, wherein the strain sleeve is sleeved on the outer side of the center shaft and is fixedly connected with the center shaft; the induction coil is arranged along the periphery of the strain detection unit; the method is characterized in that: the strain detection unit comprises a plurality of strain detection strips which are uniformly coated on the outer side wall of the strain sleeve along the circumferential direction of the strain sleeve, and the free ends of two ends of every two adjacent strain detection strips are mutually spaced along the circumferential direction of the strain sleeve.

2. A two-sided torque transducer for a bicycle with assist as in claim 1 wherein: the outer side wall of the strain sleeve is provided with a plurality of oblique insections arranged along the circumferential direction of the strain sleeve, and the strain detection strip is coated on the oblique insections.

3. A two-sided torque transducer for a bicycle with assist as in claim 1 wherein: the projection of the strain detection strip on the axial section of the strain sleeve is oblique at 45 degrees with the extension direction of the central axis.

4. A two-sided torque transducer for a bicycle with assist as in claim 1 wherein: the strain detection units are arranged in two numbers, and a gap is arranged between the two strain detection units.

5. The bicycle assisted double-sided torque transducer of claim 4, wherein: the extension directions of the strain detection strips on the two strain detection units are different.

6. The bicycle assisted double-sided torque transducer of claim 4, wherein: the projections of the strain detection strips on the two strain detection units on the axial section of the strain sleeve are perpendicular to each other.

7. A two-sided torque transducer for a bicycle with assist as in claim 1 wherein: the double-sided torque sensor of the power-assisted bicycle further comprises a sleeve, the sleeve is arranged on the outer side of the strain sleeve, and a coil fixing groove for installing and fixing the induction coil is formed in the sleeve; the signal processing unit is fixed on the sleeve.

8. A two-sided torque transducer for a bicycle with assist as in claim 7 wherein: the double-sided torque sensor of the moped further comprises a shielding cover, and the shielding cover is sleeved on the outer side of the sleeve.

9. A two-sided torque transducer for a bicycle with assist as in claim 1 wherein: the strain sleeve is provided with a first fixing part fixed to the center shaft and a second fixing part fixed with the transmission sleeve, the first fixing part and the second fixing part are respectively located at two ends of the strain detection unit along the axial direction, and a matching part connected with an external chain wheel is formed at one end, far away from the second fixing part, of the transmission sleeve.

10. A power-assisted bicycle is characterized in that: the automatic vehicle torque sensor comprises the automatic vehicle torque sensor as claimed in any one of claims 1 to 9, a first bearing sleeved on the middle shaft, a second bearing sleeved on the transmission sleeve, a left tooth bowl sleeved on the first bearing, and a right tooth bowl sleeved on the second bearing, wherein external threads for connecting and fixing with a five-way joint are arranged on the outer side walls of the left tooth bowl and the right tooth bowl.