CN217805068U

CN217805068U - Torque sensor, booster device and booster bicycle

Info

Publication number: CN217805068U
Application number: CN202221387098.7U
Authority: CN
Inventors: 肖力子
Original assignee: Shenzhen Topband Co Ltd
Current assignee: Shenzhen Topband Co Ltd
Priority date: 2022-06-02
Filing date: 2022-06-02
Publication date: 2022-11-15
Anticipated expiration: 2032-06-02

Abstract

The utility model is suitable for a power assisting field provides a torque sensor, booster unit and moped. The torque sensor includes: the middle shaft is fixedly provided with a first transmission piece; the second transmission piece is sleeved on the middle shaft and can rotate relative to the middle shaft, and the second transmission piece and the first transmission piece are arranged at intervals; the third transmission piece is sleeved outside the first transmission piece and the second transmission piece and is meshed with the same side of the first transmission piece and the second transmission piece for transmission; the bearing frame is sleeved outside the third transmission piece, the third transmission piece can rotate relative to the bearing frame, the strain gauge is arranged on the outer wall of the bearing frame, and the strain gauge is used for detecting the voltage change value of the bearing frame at the third transmission piece. Through the transmission structural design of moment of torsion, with the epaxial dynamic torque of axis convert the moment of torsion that the relation is stable in the current structure and measure, compare prior art, need not to adopt wireless transmission moment of torsion, do not have the risk that wireless power supply and wireless communication exist, the moment of torsion obtains the good reliability, and is with low costs.

Description

Torque sensor, booster device and booster bicycle

Technical Field

The utility model belongs to the bicycle field especially relates to a torque sensor, booster unit and moped.

Background

The booster bicycle is a new type two-wheel vehicle, belonging to a bicycle, and using battery as auxiliary power source, mounting motor, and having power auxiliary system, and can implement manpower riding and motor-assisted integrated new type transportation means. In the field of power-assisted bicycles, the installation positions of motors are mainly divided into two types, one type is a middle-mounted motor, namely, the motor is arranged in the middle position of a bicycle body, namely a five-way motor, and the middle-mounted motor is called a middle-mounted motor. Put motor and connected to vehicle frame in to be connected and transmit power through chain and rear wheel, pedal is installed to the both sides of motor simultaneously, does not have under the condition of power at the motor, rides passerby and can realize through pedal that the manpower rides, and resistance and normal bicycle do not have the difference. The other is mounted in the hub of the bicycle, called hub motor.

The torque sensor of the centrally-mounted power-assisted bicycle is a core technology in the bicycle, the detecting end for collecting riding torque in the riding process is used for detecting the riding torque of the centrally-mounted power-assisted bicycle in the prior art, the universal method is to collect torque strain (strain gauge resistance change caused by torque strain) by pasting a strain gauge on a rotating deformation shaft (a rotating middle shaft/an axially deformed body), collect voltage signals of the strain gauge after deformation through a half bridge/a full bridge, and perform amplification and A/D (analog/digital) processing, transmit the signals to a static signal receiving end in a wireless communication mode, so as to collect dynamic torque, and supply power to the strain gauge on the rotating shaft through electromagnetic induction (a main coil transformer form and an auxiliary coil transformer form). The method needs to solve the problems of wireless power supply and wireless communication, causes signal processing trouble, has the risk of external electromagnetic signal interference and needs electromagnetic shielding processing.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a torque sensor aims at solving need handling wireless power supply and wireless communication problem among the prior art, and it is troublesome to lead to signal processing, has outside electromagnetic signal interference risk, needs to do electromagnetic shield and handles.

The embodiment of the utility model provides a realize like this, a torque sensor for put the motor in moped, include:

the middle shaft is used for connecting the pedal and is fixedly provided with a first transmission piece;

the second transmission piece is sleeved on the middle shaft and can rotate relative to the middle shaft, the second transmission piece and the first transmission piece are arranged at intervals, and the second transmission piece is used for connecting a load;

the third transmission piece is sleeved outside the first transmission piece and the second transmission piece and is meshed with the same side of the first transmission piece and the second transmission piece for transmission;

the bearing seat is sleeved outside the third transmission piece, the third transmission piece can rotate relative to the bearing seat, and one end of the bearing seat is used for fixing the vehicle body;

the strain gauge is arranged on the outer wall of the bearing seat and used for detecting a voltage change value generated when the third transmission piece, the first transmission piece and the second transmission piece are transmitted by the bearing seat.

Further, the first transmission piece is integrally formed on the middle shaft.

Furthermore, the bearing seat comprises a bearing portion sleeved outside the third transmission member, a stress portion fixed with the vehicle body and a transition portion connected with the stress portion and the bearing portion, the inner diameter of the stress portion is smaller than that of the bearing portion, and the strain gauge is arranged on the stress portion.

Further, the transition part is in a conical structure.

The utility model also provides a booster unit, including aforementioned torque sensor and fourth driving medium, the fourth driving medium is rotationally overlapped and is located outside the axis and with the second driving medium is connected fixedly, but the one-way drive of second driving medium the fourth driving medium rotates, be used for connecting the load on the fourth driving medium.

Furthermore, one end of the second transmission member, which is far away from the first transmission member, extends out of the bearing seat to form a fixed part, a first one-way linkage member is sleeved on the fixed part, and the fourth transmission member is sleeved on the first one-way linkage member.

The utility model also provides a moped, include:

a vehicle body;

the middle motor is arranged on the vehicle body, and a fifth transmission part is arranged at the output end of the middle motor; and

in the power assisting device, the fifth transmission member is engaged with the fourth transmission member for transmission and can drive the fourth transmission member to rotate in one direction.

Furthermore, a second one-way linkage piece is arranged at the driving end of the middle motor, the fifth transmission piece is connected with the second one-way linkage piece, and the middle motor can drive the fifth transmission piece to drive the fourth transmission piece to rotate through the second one-way linkage piece.

The utility model discloses the beneficial effect who reaches: set up first driving medium and second driving medium through setting up the interval on the axis, and with the cooperation transmission of third driving medium simultaneously outside first driving medium and second driving medium, axis input torsion rotates the in-process, first driving medium can drive the second driving medium through the third driving medium and rotate, and the second driving medium is used for linking with the wheel, so can realize that pedal input moment of torsion drives the wheel rotation, and simultaneously, because the one end of bearing frame is fixed on the automobile body, consequently, form the cantilever beam structure, pass through first driving medium at the other end, radial power is applyed to the bearing frame to the second driving medium, thereby can detect the radial force of measuring the bearing frame through the moment of flexure on the bearing frame of foil gage detection, thereby can acquire the size of axis moment of torsion, the size of axis input force promptly.

Drawings

Fig. 1 is a schematic structural view of a power assisting device provided by the present invention;

FIG. 2 isbase:Sub>A cross-sectional view taken at A-A of FIG. 1;

FIG. 3 is a cross-sectional view at B-B of FIG. 1;

fig. 4 is a cross-sectional view at C-C in fig. 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The embodiment of the utility model provides a set up first driving medium and second driving medium through set up the interval in centraxonial, and simultaneously with third driving medium cooperation transmission outside first driving medium and second driving medium, axis input torsion rotates the in-process, first driving medium can drive the second driving medium through the third driving medium and rotate, and the second driving medium is used for linking with the wheel, so can realize pedal input moment of torsion and drive the wheel rotation, and simultaneously, because the one end of bearing frame is fixed on the automobile body, consequently, form the cantilever beam structure, pass through first driving medium at the other end, radial power is applyed to the bearing frame to the second driving medium, thereby can measure the radial force of bearing frame through the moment of flexure on the foil gage detection bearing frame, thereby can acquire the size of axis moment of torsion, axis input force's size promptly.

Example one

Referring to fig. 1-2, an embodiment of the present invention provides a torque sensor for a middle motor of a power assisted bicycle, including a central shaft 1, a first transmission member 2, a second transmission member 3, a third transmission member 4, a bearing seat 5 and a strain gauge 7. The middle shaft 1 is used for being connected with a pedal to enable the middle shaft 1 to rotate, the first transmission piece 2 is fixedly arranged on the middle shaft 1, the second transmission piece 3 is sleeved on the middle shaft 1 and can rotate relative to the middle shaft 1, the second transmission piece 3 and the first transmission piece 2 are arranged at intervals, the second transmission piece 3 is used for being connected with a load, namely the second transmission piece 3 is used for being linked with a wheel to drive the wheel to rotate when the middle shaft 1 rotates, the third transmission piece 4 is sleeved on the first transmission piece 2 and the outer portion of the second transmission piece 3 and is meshed with the same side of the first transmission piece 2 and the same side of the second transmission piece 3 at the same time, namely the first transmission piece 2, the second transmission piece 3 and the third transmission piece 4 are arranged in an eccentric mode, namely when the first transmission piece 2 rotates, the second transmission piece 3 can only be driven to rotate through the third transmission piece 4, meanwhile, the radial force of the first transmission piece 2 and the radial force of the second transmission piece 3 can be guaranteed to be synchronously transmitted to the third transmission piece 4, the bearing seat 5 is sleeved outside the third transmission piece 4, one end of the bearing seat 5 is used for being fixed with a vehicle body, the strain piece 7 is arranged on the outer wall of the bearing seat 5, and the strain piece 7 is used for detecting the voltage value of the transmission piece 3 when the third transmission piece 2 and the transmission piece 3 changes.

Set up first driving medium 2 and second driving medium 3 at the interval on axis 1, and cooperate the transmission with third driving medium 4 outside first driving medium 2 and second driving medium 3 simultaneously, axis 1 input torsion rotates the in-process, first driving medium 2 can drive second driving medium 3 through third driving medium 4 and rotate, and second driving medium 3 is used for linking with the wheel, so can realize pedal input torque and drive the wheel rotation, simultaneously, because the one end of bearing frame 5 is fixed on the automobile body, consequently, form the cantilever beam structure, exert radial power to bearing frame 5 through first driving medium 2, second driving medium 3 at the other end, thereby can detect the moment of flexure on the bearing frame 5 through foil gage 7 and measure the radial force of bearing frame 5, thereby can obtain the size of axis 1 moment of torsion, the size of axis 1 input force promptly.

The utility model provides a torque sensor through the transmission structural design of moment of torsion, with present structure in the axis 1 dynamic torque conversion for the stable moment of flexure of relation measure, compare prior art, need not to adopt the wireless transmission moment of torsion, do not have the risk that wireless power supply and wireless communication exist, the moment of torsion acquires the good reliability, and is with low costs.

Specifically, the third transmission member 4 and the bearing seat 5, and the middle shaft 1 and the second transmission member 3 can be connected by a bearing 6.

Further, the first transmission piece 2 is integrally formed on the middle shaft 1, so that the compactness and the reliability of the first transmission piece 2 and the middle-circumference structure can be improved.

In the present embodiment, the first transmission member 2 and the second transmission member 3 are both external gears, and the third transmission member 4 is an internal gear.

Example two

Referring to fig. 2, on the basis of the first embodiment, further, the bearing seat 5 includes a force bearing portion 51 sleeved on the third transmission member 4 (i.e., the force bearing portion 51 is sleeved on the bearing 6 outside the third transmission member 4), a force bearing portion 52 fixed to the vehicle body, and a transition portion 53 connecting the force bearing portion 52 and the force bearing portion 51, an inner diameter of the force bearing portion 52 is smaller than the force bearing portion 51, and the strain gauge 7 is disposed on the force bearing portion 52, so that, on one hand, the space occupation of the bearing seat 5 can be reduced, and on the other hand, when the force bearing portion 51 receives a radial force, the deformation degree of the force bearing portion 52 can be increased, so that the strain gauge 7 can obtain a more obvious value change, and the accuracy of obtaining the bending moment of the bearing seat 5 can be improved.

Specifically, the force-receiving portion 52 may be provided with a flange 521, so as to facilitate the connection and fixation of the bearing seat 5 and the vehicle body.

Further, the transition portion 53 is a conical structure, that is, the outer wall of the transition portion 53 is an arc-shaped structure, which can avoid the force attenuation phenomenon generated when the force bearing portion 51 is transferred to the force bearing portion 52 when the radial force is applied to the transition portion 53, and can also avoid the problem that the force bearing portion 51 is difficult to deform due to the force bearing portion 52 when the radial force is applied to the force bearing portion 51 and the change of the value of the strain gauge 7 is not obvious due to the protrusion of the transition portion 53.

Furthermore, it will be appreciated that the transition 63 may also be a substantial variation of a conical configuration, such as a perpendicular right angle configuration or other angled configuration.

EXAMPLE III

Referring to fig. 2, the utility model also provides a power assisting device, including aforementioned torque sensor and fourth driving medium 8, fourth driving medium 8 rotationally overlaps and locates outside axis 1 and be connected fixedly with second driving medium 3, but second driving medium 3 one-way drive fourth driving medium 8 rotates, and fourth driving medium 8 is used for connecting the load, and the load is the wheel.

So, through the one-way fourth driving medium 8 rotation of driving of third driving medium 4, when the user stepped on pedal, the moment of torsion of pedal to axis 1 input was transmitted on second driving medium 3 by third driving medium 4, and was transmitted fourth driving medium 8 by second driving medium 3 one-way again to drive the load, the wheel rotates promptly. When the wheel is assisted, the fourth transmission piece 8 can not drive the third transmission piece 4 to rotate, so that the load can not be transmitted to the middle shaft 1.

The utility model provides a power assisting device through the transmission structural design of moment of torsion, and the axis 1 goes up dynamic torque conversion and measures for the stable moment of flexure of relation in with current structure, compares prior art, need not to adopt the wireless transmission moment of torsion, does not have the risk that wireless power supply and wireless communication exist, and the moment of torsion acquires the good reliability, and is with low costs.

Further, the fourth transmission element 8 is provided with a load connection element 20 for connecting a load.

In this implementation, the load coupling 20 may be a crankset.

Example four

Referring to fig. 2, on the basis of the third embodiment, further, one end of the second transmission member 3, which is far away from the first transmission member 2, extends out of the bearing seat 5 to form a fixing portion 31, the fixing portion 31 is sleeved with the first one-way linkage member 30, and the fourth transmission member 8 is sleeved outside the first one-way linkage member 30. Therefore, the second transmission piece 3 and the fourth transmission piece 8 are fixed in a nesting mode through the fixing part 31, so that the fourth transmission piece 8 and the second transmission piece 2 can be fixed in a rotating mode conveniently, and even if the fourth transmission piece 8 can rotate on the second transmission piece 3 relative to the second transmission piece 3, the connection is more stable and reliable; the first one-way linkage member 30 is arranged to ensure that the second transmission member 3 can drive the fourth transmission member 8 to rotate, and the fourth transmission member 8 cannot drive the second transmission member 3 to rotate.

In this embodiment, the first one-way transmission member 30 may be a one-way bearing.

EXAMPLE five

The utility model provides a power-assisted bicycle, including automobile body (not shown in the figure), in put motor (not shown in the figure) and aforementioned booster unit. Wherein, the middle motor is arranged on the vehicle body, the output end of the middle motor is provided with a fifth transmission member 10, and the fifth transmission member 10 is meshed with the fourth transmission member 8 and can unidirectionally drive the fourth transmission member 8 to rotate.

So, when axis 1 input moment of torsion, fourth driving medium 8 can not drive fifth driving medium 10 and can not drive the output rotation of putting the motor in to avoid thereby increasing the load of manpower end because drag the motor, and put the motor and can drive fifth driving medium 10 and drive fourth driving medium 8 operation when rotating, thereby can drive load connecting piece 20, and then reduce the load of axis 1 input, produce the helping hand effect.

The utility model provides a moped through the transmission structural design of moment of torsion, with present structure in the axis 1 dynamic torque conversion for the stable moment of flexure of relation measure, compare prior art, need not to adopt the wireless transmission moment of torsion, do not have the risk that wireless power supply and wireless communication exist, the moment of torsion acquires the good reliability, and is with low costs.

Furthermore, a second one-way linkage piece 9 is arranged at the driving end of the middle motor, the fifth transmission piece 10 is connected with the second one-way linkage piece 9 in a sleeved mode, specifically, the second one-way linkage piece 9 can be a one-way bearing, the fifth transmission piece 10 is sleeved outside the second one-way linkage piece 9, and the middle motor can drive the fifth transmission piece 10 to drive the fourth transmission piece 8 to rotate through the second one-way linkage piece 9. Through the one-way linkage 9 of second, can realize putting the motor in to the one-way transmission of fourth driving medium 8 to the one-way helping hand of putting the motor in the realization.

Example six

Referring to fig. 2-4, the utility model also provides a moment detection method, including following step:

s1: acquiring a bending moment Mr of the bearing pedestal 5, specifically acquiring a strain force of the bearing pedestal 5, and acquiring the bending moment Mr of the bearing pedestal 5 according to the strain force;

according to the general measuring method of the strain gauge 7, the strain gauge 7 on the bearing seat 5 can measure the bending moment Mr applied to the calibrated bearing seat 5.

S2: acquiring the radial force of the bearing seat 5 according to the bending moment of the bearing seat 5 and the stress force arm L of the bearing seat 5, wherein the radial force of the bearing seat 5 is equal to the radial force of the third transmission piece 4;

the bending moment of the bearing seat 5 is generated by the radial force Fr of the third transmission member 4, and the force-bearing arm L of the bearing seat 5 is the distance from the force-bearing center of the third transmission member 4 to the joint of the bearing seat 5 and the vehicle body, so that the calculation formula is shown as follows: mr = Fr × L.

S3: acquiring a circumferential force Ft1 of the first transmission piece 2 and a circumferential force Ft2 of the second transmission piece 3 according to the radial force Fr of the bearing seat 5, the pressure angle alpha of the first transmission piece 2 and the pressure angle alpha of the second transmission piece 3;

the radial force Fr of the bearing seat 5 is of the same magnitude and opposite direction to the radial force Fr' of the third transmission element 4, while the radial force of the third transmission element 4 is the sum of the radial force Fr1 of the first transmission element 2 and the radial force Fr2 of the second transmission element 3, so that there is the formula Fr = Fr1+ Fr2;

the reason is that: ft1= Fr1/tan α

Ft2＝Fr2/tanα

The following can be obtained: ft1+ Ft2= Fr/tan α

The pressure angle alpha is a mechanical parameter fixed value of the transmission member, and the pressure angles of the first transmission member 2, the second transmission member 3 and the third transmission member 4 which are matched with each other are the same and are all alpha;

s4: and obtaining the torquing torch of the middle shaft 1 according to the circumferential force and the radius of the first transmission piece 2 and the circumferential force and the radius of the second transmission piece 3.

According to the force analysis of the middle shaft 1, the torques of the first gear wheel and the second gear wheel are obtained and are the torque M of the middle shaft 1, and then:

M＝Ft1*R1

M＝Ft2*R2

then there are: M/R1+ M/R2= Fr/tan α

Thus, M = Fr 1R 2/[ (R1 + R2) × tan α ] = Mr 1R 2/[ (R1 + R2) × tan α L ] was obtained.

EXAMPLE seven

On the basis of the sixth embodiment, further, the step of obtaining the bending moment of the bearing seat 5 specifically includes:

s11: and acquiring the strain force of the bearing pedestal 5, and acquiring the bending moment of the bearing pedestal 5 according to the strain force.

The change in resistance of the bearing housing 5 when subjected to a force is detected by the strain gauge 7 provided on the bearing housing 5, and the resulting bending moment Mr is obtained.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a torque sensor for put motor among moped, its characterized in that includes:

2. The torque transducer as in claim 1, wherein the first transmission member is integrally formed on the central shaft.

3. The torque sensor as claimed in claim 1, wherein the bearing seat comprises a force bearing portion sleeved outside the third transmission member, a force bearing portion fixed with the vehicle body, and a transition portion connecting the force bearing portion and the force bearing portion, wherein the inner diameter of the force bearing portion is smaller than that of the force bearing portion, and the strain gauge is arranged on the force bearing portion.

4. The torque transducer of claim 3, wherein the transition portion is a conical structure.

5. An assistive device, comprising the torque sensor according to any one of claims 1 to 4, and a fourth transmission member, wherein the fourth transmission member is rotatably sleeved outside the central shaft and fixedly connected to the second transmission member, the second transmission member can drive the fourth transmission member to rotate in one direction, and the fourth transmission member is used for connecting a load.

6. The power assisting device of claim 5, wherein an end of the second transmission member, which is away from the first transmission member, extends out of the bearing seat to form a fixed portion, a first one-way linkage member is sleeved on the fixed portion, and the fourth transmission member is sleeved on the first one-way linkage member.

7. A power assisted bicycle, comprising:

a vehicle body;

the power assist device according to claim 5 or 6, wherein the fifth transmission element is in meshing transmission with the fourth transmission element and is operable to rotate the fourth transmission element in one direction.

8. The power-assisted bicycle of claim 7, wherein the driving end of the mid-motor is provided with a second one-way linkage member, the fifth transmission member is connected with the second one-way linkage member, and the mid-motor can drive the fifth transmission member to drive the fourth transmission member to rotate through the second one-way linkage member.