CN107588875B - Strain gauge type moment sensor and motor - Google Patents
Strain gauge type moment sensor and motor Download PDFInfo
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- CN107588875B CN107588875B CN201710758777.8A CN201710758777A CN107588875B CN 107588875 B CN107588875 B CN 107588875B CN 201710758777 A CN201710758777 A CN 201710758777A CN 107588875 B CN107588875 B CN 107588875B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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Abstract
The invention provides a strain gauge type moment sensor, which comprises a shifting fork ring and a strain gauge; the plurality of shifting fork rings comprise a first shifting fork ring and a second shifting fork ring; the shifting fork ring is provided with an inclined bulge and an inclined groove; in the two shifting fork rings, the inclined bulge on one shifting fork ring is matched with the inclined groove on the other shifting fork ring; the inclined bulge can slide relative to the inclined groove; the strain gauge is connected with the first shifting fork ring, and the inclined bulge and the inclined groove relatively slide to cause the strain gauge to deform. The torque sensor is small in size, can be combined with a motor, does not need to be independently installed, and avoids a complicated wiring and wiring process.
Description
Technical Field
The invention relates to the field of electric bicycle accessories, in particular to a strain gauge type moment sensor and a motor.
Background
In the prior art, an electric power bicycle adopting a torque sensor is comfortable, relaxed, smooth and good in following performance, and has the advantages of excellent top wind climbing performance, and the important advantage of the torque power riding is environmental protection and energy conservation: due to the participation of manpower, the electric energy consumption of the lithium battery, namely a vehicle-carried limited energy source, is reduced. Compared with pure electric driving, under the condition of the same endurance mileage, the battery capacity can be reduced by half, and the power, weight and manufacturing cost of the motor can be greatly reduced. There are several typical ways of torque sensing based on the above current use: 1) The device is arranged on a center shaft, axial displacement is generated by utilizing torque, and a torque signal is obtained by utilizing Hall to detect the axial displacement; 2) The strain gauge is arranged on the center shaft, the strain gauge is powered by a collecting ring, and signals are output by the collecting ring; 3) The torque signal is obtained by arranging a spline on the output shaft, changing the relative positions of the two groups of splines when the output shaft is twisted, changing the magnetic induction intensity of the two groups of coils on the spline, and converting the change of the magnetic induction intensity into a voltage signal through the coils.
However, the torque sensor and the rear-drive motor which are arranged on the central shaft are required to be independently arranged, the torque sensor and the motor are required to be connected with the controller through respective wires for transmitting signals and power, and the torque sensor arranged on the central shaft is high in price, so that the production cost is increased.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a strain gauge type moment sensor and a motor.
The strain gauge type moment sensor provided by the invention comprises a shifting fork ring and a strain gauge;
the plurality of shifting fork rings comprise a first shifting fork ring and a second shifting fork ring;
the shifting fork ring is provided with an inclined bulge and an inclined groove;
in the two shifting fork rings, the inclined bulge on one shifting fork ring is matched with the inclined groove on the other shifting fork ring; the inclined bulge can slide relative to the inclined groove;
the strain gauge is connected with the first shifting fork ring, and the inclined bulge and the inclined groove relatively slide to cause the strain gauge to deform.
Preferably, the oblique protrusions and the oblique grooves are respectively positioned on the axial end surfaces of the first shifting fork ring and the second shifting fork ring;
the plurality of oblique protrusions are arranged along the circumferential direction of the first shifting fork ring;
the plurality of the inclined grooves are arranged along the circumferential direction of the second fork ring.
Preferably, further comprises a displacement ring;
the displacement ring comprises a displacement ring shaft and a displacement ring shoulder;
the first shifting fork ring is sleeved on the displacement ring shaft; the strain gauge is connected with the first shifting fork ring through the displacement ring.
Preferably, the motor shaft is further comprised;
the displacement ring is sleeved on the motor shaft; the displacement ring is circumferentially fixed with the motor shaft;
the second shifting fork ring is connected with the motor shaft through a bearing.
Preferably, the displacement ring is connected to the motor shaft by a pin or key.
Preferably, the motor shaft comprises a motor shoulder;
a deformation element is arranged between the motor shaft shoulder and the displacement ring shoulder, and a strain gauge is arranged on the deformation element; or alternatively, the process may be performed,
the strain gage is directly mounted on the displacement collar, which forms a deformation element.
Preferably, the motor further comprises a cover plate and a motor housing; the cover plate is fixedly connected with the motor shell;
the first shifting fork ring is fixedly connected with the cover plate in the circumferential direction; the second shifting fork ring is connected with the motor shell through a bearing.
Preferably, the flywheel and the PCB are also included;
the flywheel is arranged on the second shifting fork ring;
the strain gauge is connected with the PCB.
Preferably, the inclined groove comprises a guide wall surface and a limit wall surface;
the guide wall surface extends obliquely relative to the bottom surface of the groove; the limiting wall surface is perpendicular to the bottom surface of the groove.
The invention also provides a motor comprising the strain gauge type moment sensor.
Compared with the prior art, the invention has the following beneficial effects:
1. the torque sensor is small in size, can be combined with a motor, does not need to be independently installed, and avoids a complicated wiring and wiring process;
2. the invention indirectly detects the torque during riding by using the axial component force of the inclined plane, and has simple structure and high sensitivity;
3. the invention has low price, economy and practicability.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a strain gauge type torque sensor according to the present invention;
FIG. 2 is an assembly schematic diagram of a first fork ring and a second fork ring.
The figure shows:
deformation element 7 of motor housing 1
Strain gauge 8 of cover plate 2
First bearing 3 displacement ring 9
Inclined groove 51 motor shaft 11
Limiting wall 512 PCB 12
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the embodiment shown in fig. 1, the strain gauge type moment sensor provided by the invention comprises a motor housing 1, a cover plate 2, a shift fork ring, a strain gauge 8, a motor shaft 11, a PCB 12 and a flywheel 13, wherein the shift fork ring forms two shift fork rings of a first shift fork ring 4 and a second shift fork ring 5, the PCB 12 is connected with the strain gauge 8, and the PCB 12 is mounted on a part relatively fixed to the motor shaft 11, such as a stator. The flywheel 13 is fixedly arranged on the outer surface of the second shifting fork ring 5, an axial opening is arranged on the second shifting fork ring 5, and the inner wall and the outer wall of the second shifting fork ring 5 are respectively connected with the motor shaft 11 and the motor shell 1 through bearings. The second shifting fork ring 5 and the first shifting fork ring 4 are coaxially arranged, an inclined groove 51 is formed in the end face of one end of the second shifting fork ring 5 along the axial direction, an inclined protrusion 41 is correspondingly formed in the end face of one end of the first shifting fork ring 4 along the axial direction, and the shape of the inclined protrusion 41 is matched with that of the inclined groove 51. The first shifting fork ring 4 is fixed with the cover plate 2 in the circumferential direction relatively, and the cover plate 2 is fixedly connected with the motor shell. When riding, the sprocket is driven to drive the flywheel 13 to rotate, so as to drive the second shifting fork ring 5 to rotate, the inclined groove 51 on the axial end surface of the second shifting fork ring 5 transmits torque to the inclined bulge 41 on the end surface of the first shifting fork ring 4, the outer ring of the first shifting fork ring 4 is circumferentially fixed with the inner hole of the cover plate 2, and the cover plate 2 is fixed on the motor housing 1, so that the motor housing 1 is driven to rotate, and finally the bicycle is driven to advance. In a preferred embodiment, the first shift fork ring comprises a plurality of inclined protrusions 41 and a plurality of inclined grooves 51, wherein the inclined protrusions 41 are arranged along the circumferential direction of the first shift fork ring 4; the plurality of inclined grooves 51 are arranged along the circumferential direction of the second shift fork ring 5, the inclined protrusions 41 are in one-to-one correspondence with the inclined grooves 51, and the purpose of arranging the plurality of groups of inclined protrusions 41 and the inclined grooves 51 is to transmit larger moment and prevent the inclined protrusions 41 from breaking when the moment is larger. Preferably, a diagonal groove 51 may be provided on the first fork ring 4, and a diagonal protrusion 41 may be provided on the second fork ring 5, respectively. It is further preferable that the first fork ring 4 and the second fork ring 5 are both provided with the inclined protrusions 41 and the inclined grooves 51, and the inclined protrusions 41 on one fork ring are matched with the inclined grooves 51 on the other fork ring.
The displacement ring 9 comprises a displacement ring shaft 92 and a displacement ring shoulder 91; the first fork ring 4 is sleeved on the displacement ring shaft 92 and contacts with the displacement ring shoulder 91. The displacement ring 9 is integrally sleeved on the motor shaft 11, and the displacement ring 9 is fixed with the motor shaft 11 in the circumferential direction relatively through the pin 10. The motor shaft 11 comprises a motor shaft shoulder 111, a deformation element 7 is arranged between the motor shaft shoulder 111 and the displacement ring shoulder 91, and a strain gauge 8 is arranged on the deformation element 7. As shown in fig. 2, the inclined groove 51 includes a guiding wall 511 and a limiting wall 512: the guiding wall surface 511 extends obliquely relative to the bottom surface of the groove, and the limiting wall surface 512 is perpendicular to the bottom surface of the groove. In the riding process, the first shifting fork ring 4 generates circumferential rotation on the displacement ring 9 by the torque provided by the second shifting fork ring 5, the inclined bulge 41 is contacted with the guide wall surface 511, the acting force of the guide wall surface 511 on the inclined bulge 41 can be decomposed into circumferential force and axial force, the first shifting fork ring 4 further drives the displacement ring 9 to axially move under the action of the axial force, the deformation element 7 is deformed, and the strain gauge 8 detects the deformation to obtain the moment, so that the principle of the strain gauge type moment sensor provided by the invention is summarized as follows: when riding, the flywheel 13 is driven to rotate by the pedal driving sprocket, the riding moment of the flywheel 13 is divided into force and axial force for overcoming the resisting moment of the rotation of the wheel rim by the inclined bulge 41 of the first shifting fork, the strain element 7 is forced to deform by the axial force, then the strain gauge 8 is utilized for detecting the moment, and the larger the resisting moment is, the larger the axial force is, so that the moment is indirectly reflected. In a preferred embodiment, the displacement ring 9 is also keyed to the motor shaft 11. Preferably, the strain gauge 8 may also be mounted directly on the opposite side of the displacement ring shoulder 91 to the axial force, the displacement ring 9 forming the deformation element 7, the moment being detected by detecting the squeezing deformation or torsional deformation of the displacement ring 9 by the motor shoulder 111.
The invention also provides a motor, which comprises the strain gauge type moment sensor, and the motor is arranged on a rear fork of a bicycle. The advantage of this structure lies in, can combine moment sensor and traditional motor, installs simultaneously on the bicycle rear axle, has avoided complicated wire to arrange the design, and the acquisition of moment signal is more timely accurate.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (10)
1. The strain gauge type moment sensor is characterized by comprising a motor shell, a cover plate, a shifting fork ring, a deformation element, a strain gauge, a displacement ring, a motor shaft, a PCB (printed circuit board) and a flywheel;
the plurality of shifting fork rings comprise a first shifting fork ring and a second shifting fork ring;
the shifting fork ring is provided with an inclined bulge and an inclined groove; the inclined groove comprises a guide wall surface and a limit wall surface;
in the two shifting fork rings, the inclined bulge on one shifting fork ring is matched with the inclined groove on the other shifting fork ring; the inclined bulge can slide relative to the inclined groove;
in the working process, the first shifting fork ring generates circumferential rotation on the displacement ring by torque provided by the second shifting fork ring, the oblique bulge is contacted with the guide wall surface, the acting force of the guide wall surface on the oblique bulge is decomposed into circumferential force and axial force, the first shifting fork ring drives the displacement ring to axially move under the action of the axial force, the deformation element is deformed, and the strain gauge detects the deformation to obtain the torque;
the strain gauge is connected with the first shifting fork ring, and the inclined bulge and the inclined groove relatively slide to cause the strain gauge to deform.
2. The strain gauge type torque sensor of claim 1, wherein the oblique protrusions and the oblique grooves are respectively positioned on axial end surfaces of the first shifting fork ring and the second shifting fork ring;
the plurality of oblique protrusions are arranged along the circumferential direction of the first shifting fork ring;
the plurality of the inclined grooves are arranged along the circumferential direction of the second fork ring.
3. The strain gage torque sensor of claim 1, further comprising a displacement ring;
the displacement ring comprises a displacement ring shaft and a displacement ring shoulder;
the first shifting fork ring is sleeved on the displacement ring shaft; the strain gauge is connected with the first shifting fork ring through the displacement ring.
4. A strain gage torque sensor as in claim 3 further comprising a motor shaft;
the displacement ring is sleeved on the motor shaft; the displacement ring is circumferentially fixed with the motor shaft;
the second shifting fork ring is connected with the motor shaft through a bearing.
5. The strain gage type torque sensor of claim 4, wherein the displacement ring is coupled to the motor shaft by a pin or key.
6. The strain gage type torque sensor of claim 4, wherein the motor shaft comprises a motor shoulder;
a deformation element is arranged between the motor shaft shoulder and the displacement ring shoulder, and a strain gauge is arranged on the deformation element; or alternatively, the process may be performed,
the strain gage is directly mounted on the displacement collar, which forms a deformation element.
7. The strain gage type torque sensor of claim 1, further comprising a cover plate and a motor housing; the cover plate is fixedly connected with the motor shell;
the first shifting fork ring is fixedly connected with the cover plate in the circumferential direction; the second shifting fork ring is connected with the motor shell through a bearing.
8. The strain gage type torque sensor of claim 1, wherein the flywheel is mounted on the second shift fork ring;
the strain gauge is connected with the PCB.
9. The strain gage type torque sensor of claim 1 wherein the guide wall extends diagonally relative to the bottom surface of the slot;
the limiting wall surface is perpendicular to the bottom surface of the groove.
10. An electric machine comprising a strain gauge torque sensor according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710758777.8A CN107588875B (en) | 2017-08-29 | 2017-08-29 | Strain gauge type moment sensor and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710758777.8A CN107588875B (en) | 2017-08-29 | 2017-08-29 | Strain gauge type moment sensor and motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107588875A CN107588875A (en) | 2018-01-16 |
| CN107588875B true CN107588875B (en) | 2023-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710758777.8A Active CN107588875B (en) | 2017-08-29 | 2017-08-29 | Strain gauge type moment sensor and motor |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116581938B (en) * | 2023-06-06 | 2023-11-21 | 北京鼎昱晨星技术服务有限公司 | Flywheel torque sensor |
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| CN2161553Y (en) * | 1993-07-14 | 1994-04-13 | 乐汉东 | Power-aid speed governor for bicycle |
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| JP2002139149A (en) * | 2000-10-31 | 2002-05-17 | Isuzu Motors Ltd | Operation mechanism for shift fork |
| DE202005016525U1 (en) * | 2005-10-17 | 2006-02-02 | Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg | Shift fork for transmission of motor vehicle, has contact cushion having contact areas and ramp section, in which ramp section is inclined to ensure supply of lubricant between contact areas and lateral surfaces of groove of shift collar |
| CN2828774Y (en) * | 2005-06-17 | 2006-10-18 | 南京航空航天大学 | Two-dimensional force/force moment sensor |
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| CN103471751A (en) * | 2013-09-26 | 2013-12-25 | 北京空间飞行器总体设计部 | High-precision strain type torque sensor |
| CN103604600A (en) * | 2013-12-09 | 2014-02-26 | 上海市东方海事工程技术有限公司 | Strain propeller electric test dynamometer |
| CN204202790U (en) * | 2014-09-20 | 2015-03-11 | 江苏海博流体控制有限公司 | Moment measuring device |
| CN204308125U (en) * | 2014-12-15 | 2015-05-06 | 昌利锻造有限公司 | A kind of automobile shift fork cold straight die |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207600637U (en) * | 2017-08-29 | 2018-07-10 | 新安乃达驱动技术（上海）股份有限公司 | Foil gauge type torque sensor and motor |
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2017
- 2017-08-29 CN CN201710758777.8A patent/CN107588875B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2161553Y (en) * | 1993-07-14 | 1994-04-13 | 乐汉东 | Power-aid speed governor for bicycle |
| CN2270967Y (en) * | 1994-06-19 | 1997-12-17 | 浙江海门电子仪器厂 | Electric machine output torgue measurer |
| JP2002139149A (en) * | 2000-10-31 | 2002-05-17 | Isuzu Motors Ltd | Operation mechanism for shift fork |
| CN2828774Y (en) * | 2005-06-17 | 2006-10-18 | 南京航空航天大学 | Two-dimensional force/force moment sensor |
| DE202005016525U1 (en) * | 2005-10-17 | 2006-02-02 | Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg | Shift fork for transmission of motor vehicle, has contact cushion having contact areas and ramp section, in which ramp section is inclined to ensure supply of lubricant between contact areas and lateral surfaces of groove of shift collar |
| CN1865877A (en) * | 2006-06-20 | 2006-11-22 | 淮海工学院 | Mechanical stress measuring apparatus |
| CN103471751A (en) * | 2013-09-26 | 2013-12-25 | 北京空间飞行器总体设计部 | High-precision strain type torque sensor |
| CN103604600A (en) * | 2013-12-09 | 2014-02-26 | 上海市东方海事工程技术有限公司 | Strain propeller electric test dynamometer |
| CN204202790U (en) * | 2014-09-20 | 2015-03-11 | 江苏海博流体控制有限公司 | Moment measuring device |
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| CN107588875A (en) | 2018-01-16 |
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Address after: 201100 floor 1-2, block a, No. 19, Lane 133, Guangzhong Road, Minhang District, Shanghai Applicant after: Aneida drive technology (Shanghai) Co.,Ltd. Address before: 201108 1-3 floors, No. 2060, No. 2060, Garden Road, Shanghai City Applicant before: NEW ANANDA DRIVE TECHNIQUES(SHANGHAI) Co.,Ltd. |
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