CN216301376U

CN216301376U - Chain transmission middle axle moment sensing device for electric bicycle

Info

Publication number: CN216301376U
Application number: CN202122755883.5U
Authority: CN
Inventors: 徐建; 史超伟
Original assignee: Aneida Drive Technology Shanghai Co ltd
Current assignee: Aneida Drive Technology Shanghai Co ltd
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2022-04-15
Anticipated expiration: 2031-11-11

Abstract

The utility model provides a chain transmission middle shaft torque sensing device for an electric bicycle, which comprises a BB shaft, a deformation sleeve, a PCB and a strain gauge, wherein the deformation sleeve is sleeved outside the BB shaft, and two ends of the BB shaft are respectively in running fit with the deformation sleeve through a first bearing and a second bearing; the PCB and the strain gauge are mounted on the deformation sleeve, when the electric bicycle is ridden, the chain is tensioned, and then the BB shaft generates radial thrust and acts on the deformation sleeve through the second bearing, so that the deformation sleeve generates deformation and the deformation acts on the strain gauge; the torque is converted into radial force by using the deformation sleeve, the radial force is detected by using the strain gauge, and the radial force is converted into a signal for a user to use through a circuit structure of the PCB without a wireless power supply technology, so that the problems of complex wiring and difficult installation of the torque sensor are solved.

Description

Chain transmission middle axle moment sensing device for electric bicycle

Technical Field

The utility model relates to the technical field of electric bicycles, in particular to a chain transmission middle shaft torque sensing device for an electric bicycle.

Background

An electric bicycle is a riding type which is based on a bicycle structure and is provided with an electric power driving unit. The electric moped can provide corresponding power support according to the pedaling force of a rider, reduce the riding load of the rider and greatly increase the riding comfort and the riding mileage, so that the electric moped is gradually popular in the market. The torque sensor is a core component of the electric moped. The torque sensor is used for sensing and measuring the riding torque of a rider and providing a judgment basis for the power output of the electric drive unit.

The performance of the torque sensor is important as a component for sensing the intention of a rider, but most of the conventional torque sensors have the problems of complex wiring, complex structure, difficult installation and the like.

Patent document CN204452768U discloses a middle axle type torque sensor for electric bicycle, which includes a middle axle, an eccentric sleeve, and an outer layer installation sleeve, wherein the eccentric sleeve is sleeved on the middle axle middle section, the outer layer installation sleeve is sleeved on the eccentric sleeve, a bearing is arranged between the inner two ends of the eccentric hole of the eccentric sleeve and the middle axle, a bearing is arranged between the two end openings of the outer layer installation sleeve and the outer sleeve walls at the two ends of the eccentric sleeve, one end of the outer layer installation sleeve is provided with an annular edge, one end of the annular edge is provided with a circuit board and a torque sensing device for monitoring the output torque information of the middle axle, but the design structure is complex, and the design is unreasonable.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide a chain transmission middle shaft torque sensing device for an electric bicycle.

The utility model provides a chain transmission middle shaft torque sensing device for an electric bicycle, which comprises a BB shaft, a deformation sleeve, a PCB and a strain gauge, wherein the deformation sleeve is arranged on the BB shaft;

the deformation sleeve is sleeved outside the BB shaft, and two ends of the BB shaft are respectively in running fit with the deformation sleeve through a first bearing and a second bearing;

the PCB and the strain gauge are mounted on the deformation sleeve, when the electric bicycle is ridden, the chain is tensioned, and then the BB shaft generates radial thrust and acts on the deformation sleeve through the second bearing, so that the deformation sleeve generates deformation and the deformation acts on the strain gauge;

the strain gauge is electrically connected with the PCB.

Preferably, a magnetic ring is mounted on the BB shaft.

Preferably, a cable connecting the strain gauge is soldered or plugged on the PCB board.

Preferably, one or more strain gauges are adhered to the side, matched with the second bearing, of the deformation sleeve.

Preferably, the end of the deformation sleeve has a groove and a circlip is disposed in the groove for positioning the first bearing on the BB shaft.

Preferably, the outer sleeve of the deformation sleeve is provided with a five-way valve.

Preferably, one side of the deformation sleeve is fastened with the lower cover plate through the upper cover plate, and the other side of the deformation sleeve is fastened through the fixing piece.

Preferably, two ends of the five-way are respectively contacted and abutted with the lower cover plate and the fixing piece.

Preferably, the upper cover plate and the lower cover plate are mounted on the deformation sleeve through connecting pieces.

Preferably, the fixing piece adopts a round nut, and the round nut is in threaded fit with the deformation sleeve.

Compared with the prior art, the utility model has the following beneficial effects:

1. the torque sensor uses the elastic deformation mechanism to convert the torque into the radial force, uses the strain gauge to detect the radial force, and converts the radial force into a signal for a user to use through the structural operation of the PCB circuit without a wireless power supply technology, thereby solving the problems of complex wiring, complex structure and difficult installation of the torque sensor.

2. The utility model uses the elastic deformation mechanism to convert the torque into the radial force, and has simple structure, simple and reliable processing technology, high processing precision and good measurement linearity.

3. The strain gauge is adopted to collect signals, the deformation and stress parts are made of metal materials, the temperature influence is small, and the signals are stable and reliable.

Drawings

Other features, objects and advantages of the utility model will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic cross-sectional view of the structure of the present invention;

FIG. 2 is a schematic cross-sectional view of the present invention at the second bearing;

fig. 3 is an exploded view of the structure of the present invention.

The figures show that:

BB axle 1 second bearing 10

Round nut 2 screw 11

Retainer ring 3 PCB board 12

First bearing 4 strain gage 13

Stress surface 501 of deformation sleeve 5

Five-way 6 fixed step 502

First opening 503 of magnetic ring 7

Second opening 504 of lower cover plate 8

Upper cover plate 9

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 utility model, but are not intended to limit the utility model in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the utility model. All falling within the scope of the present invention.

The utility model provides a chain transmission middle shaft moment sensing device for an electric bicycle, which comprises a BB shaft 1, a deformation sleeve 5, a PCB (printed circuit board) 12 and a strain gauge 13, wherein the deformation sleeve 5 is sleeved outside the BB shaft 1, two ends of the BB shaft 1 are respectively matched with the deformation sleeve 5 through a first bearing 4 and a second bearing 10 in a rotating manner, the PCB 12 and the strain gauge 13 are both arranged on the deformation sleeve 5, when the electric bicycle is ridden, a pedal is stepped on by a foot to generate acting force and the acting force is transmitted to a chain through a chain wheel, the chain is tensioned to enable the BB shaft 1 to generate radial thrust and face the cross section of the second bearing 10, as shown in FIG. 2, as the direction of the chain tension is opposite along the straight line, the leftward component force generated on the BB shaft 1 acts on a stress surface 501 of the deformation sleeve 5 through the second bearing 10, and accordingly the deformation sleeve 5 generates leftward strain; the fixed second bearing 10 of fixed step 502 is had to the inside left side top of cover 5 that warp, and the fixed step is then got rid of to the inside left side below of cover 5 that warp, vertical decurrent pedal force then can not directly transmit to warp on the cover stress surface 501, and acts on the power that warp the cover 5 right side, owing to at the first trompil 503 in left side and second trompil 504, can play the partition effect, makes stress obtain the release, reduces the influence to stress surface 501. Deformation that the cover 5 produced warp is used in foil gage 13, and foil gage 6 is followed deformation cover 5 and is warp, and foil gage 13 is connected with PCB board 12 electricity, and foil gage 13 warp output deformation signal to PCB board 4, and PCB board 4 calculates the back with signal output to outside, supplies the user to use.

One or more strain gauges 13 are adhered to the side, matched with the second bearing 10, of the deformation sleeve 5, and when a radial acting force is generated, the second bearing 10 tends to move towards the direction of the deformation sleeve 5 so as to generate a radial thrust force to enable the deformation sleeve 5 to deform under stress.

In practical application, the cable connected with the strain gauge 13 is soldered or plugged on the PCB 12 to realize signal transmission.

Specifically, the end of the deformation sleeve 5 is provided with a groove, a hole check ring 3 is arranged in the groove, the hole check ring 3 is used for positioning the first bearing 4 on the BB shaft 1, one side of the deformation sleeve 5 is fastened with a lower cover plate 8 through an upper cover plate 9, the other side of the deformation sleeve 5 is fastened through a fixing piece, a five-way valve 6 is sleeved outside the deformation sleeve 5, and two ends of the five-way valve 6 are respectively contacted and abutted with the lower cover plate 8 and the fixing piece. The fixed part preferably adopts a round nut 2, and the round nut 2 is in threaded fit with the deformation sleeve 5.

Further, the upper cover plate 9 and the lower cover plate 8 are mounted on the deformation sleeve 5 by means of a connection member, preferably a screw 11.

Specifically, the BB shaft 1 is preferably provided with a magnetic ring 7, which integrates a pedal frequency signal through a detection component, and is used together with a torque signal by a user.

The working principle of the utility model is as follows:

in the use, when the user trampled on pedal, on will clockwise moment of torsion transmitted the chain through the chain wheel, make the chain rise tightly, under the circumstances of interaction force, the tension reaction of chain is transmitted the BB axle 1 right side to the chain wheel. In the axial direction of the BB axis 1, a part of the component force is converted into a thrust force in the left direction. The thrust is transmitted to the second bearing 10 and then transmitted to the deformation sleeve 5, the deformation sleeve 5 is deformed due to the effect of the radial force of the inner ring, the strain gauge 13 is deformed, the strain gauge 13 outputs a signal to the PCB 12, the PCB 12 calculates the signal and outputs the signal to the outside for a user to use.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the utility model. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims

1. A chain transmission middle shaft moment sensing device for an electric bicycle is characterized by comprising a BB shaft (1), a deformation sleeve (5), a PCB (printed circuit board) (12) and a strain gauge (13);

the deformation sleeve (5) is sleeved outside the BB shaft (1), and two ends of the BB shaft (1) are respectively in running fit with the deformation sleeve (5) through a first bearing (4) and a second bearing (10);

the PCB (12) and the strain gauge (13) are both arranged on the deformation sleeve (5), when the electric bicycle is ridden, the chain is tensioned, so that the BB shaft (1) generates radial thrust and acts on the deformation sleeve (5) through the second bearing (10), and the deformation sleeve (5) generates deformation and acts on the strain gauge (13);

the strain gauge (13) is electrically connected with the PCB (12).

2. The torque sensor of chain transmission bottom bracket axle for moped as claimed in claim 1, wherein the BB axle (1) is installed with a magnetic ring (7).

3. The torque sensor of chain transmission bottom bracket axle for moped as claimed in claim 1, wherein the cable connecting the strain gauge (13) is soldered or plugged to the PCB (12).

4. The torque sensor of middle axle of chain transmission for moped as claimed in claim 1, wherein one or more strain gauges (13) are adhered to the side of the deformation sleeve (5) engaged with the second bearing (10).

5. The torque sensor arrangement in a chain drive bottom bracket for an electric bicycle according to claim 1, wherein the deformation sleeve (5) has a groove at its end and a hole collar (3) is arranged in the groove, the hole collar (3) being used to position the first bearing (4) on the BB axle (1).

6. The torque sensor of the bottom bracket axle in chain transmission for moped as stated in claim 1, wherein the deformation sleeve (5) is externally sleeved with a five-way (6).

7. The torque sensor of the bottom bracket axle in chain transmission for moped as claimed in claim 6, wherein one side of the deformation sleeve (5) is fastened to the bottom cover plate (8) by the top cover plate (9), and the other side of the deformation sleeve (5) is fastened by the fixing member.

8. The torque sensor of the bottom bracket axle in chain transmission for electric bicycles of claim 7, wherein two ends of the bottom bracket (6) are respectively contacted and pressed against the bottom cover plate (8) and the fixing member.

9. The torque sensor of chain transmission bottom bracket axle for moped according to claim 7, wherein the upper cover plate (9) and the lower cover plate (8) are mounted on the deformation sleeve (5) through a connecting member.

10. The torque sensor of the bottom bracket axle in chain transmission for moped according to claim 7, wherein the fixing member is a round nut (2), and the round nut (2) is in threaded engagement with the deformation sleeve (5).