TWI546224B - Device for detecting treadle force of motor-assisted bicycle - Google Patents

Description

Electric assisted bicycle pedaling force detecting device

The present invention relates to a pedaling force detecting device for a power-assisted bicycle, and more particularly to an invention of a pedaling force detecting device which is cheaper, more stable, and easier to install.

Various types of detecting devices have been proposed for the pedaling force detecting device for the electric assist bicycle. An elastic body that expands and contracts in response to a pedaling force generated in a rotation direction, and a movement that converts the expansion and contraction of the elastic body in a rotational direction into an axial direction, and detects the movement thereof, is disclosed in Japanese Patent Application Laid-Open No. 2001-246490. The amount of technology.

Further, Japanese Laid-Open Patent Publication No. 2012-13626 discloses that each of the two members whose relative positions are changed in accordance with the pedaling force in the rotation direction is provided with a projection on the circumference, and the offset of the projection is read by two sensors. structure.

However, in JP-A-2001-249058, it is necessary to have a structure in which the expansion and contraction of the elastic body in the rotational direction is converted into the movement in the axial direction. The device is complicated and the number of parts is large, and the accuracy of the parts is also required, so that there is a high cost. problem.

Further, in Japanese Laid-Open Patent Publication No. 2012-13626, since the distance between the sensor and the protruding portion is unstable due to the looseness in the axial direction, there is a problem that the accuracy is deteriorated.

The present invention is an invention that solves the above-described problems at one time, and provides an invention of a pedaling force detecting device for a power-assisted bicycle having a simple structure, low cost, and high precision.

In order to achieve the above object, the pedaling force detecting device for a power-assisted bicycle according to the present invention includes: a driving wheel and an inner driving wheel fixed to the crank, and the opposing outer driving wheel and the inner driving wheel are opposed to each other and disposed to be opposite to each other The outer driving wheel and the inner driving wheel rotate the sprocket of a certain angle, and the outer driving wheel and the inner driving wheel have a plurality of pressing action means, and the sprocket has a plurality of pressing forces opposite to the pressing action means The receiving means, wherein the plurality of elastic bodies that expand and contract in accordance with the amount of change in the rotation direction of the outer driving wheel and the inner driving wheel and the sprocket are disposed between the pressing operation means and the pressure receiving means, thereby In the toothed disc formed by the outer driving wheel and the inner driving wheel and the sprocket indirectly connected to each other, the cylindrical inner sensor blocking wheel train having a plurality of openings on the side surface of the cylinder is integrally provided to The inner driving wheel is integrally formed on the side surface of the cylinder and has a plurality of openings on the substantially normal line of the opening of the inner sensor blocking wheel. In the sprocket, and providing a sensor for reading the offset of the opening of the inner sensor blocking wheel and the opening of the outer sensor blocking wheel according to the change of the pedaling force of the toothed disc, With this configuration, even if the looseness in the axial direction occurs, the change in the pedaling force can be accurately read.

More specifically, by setting the opening portion of the inner sensor blocking wheel and the opening portion of the outer sensor blocking wheel to be wider than the reading range of the sensor, it is possible to achieve looseness even in the axial direction. The pedaling force change can also be read with good precision.

Embodiments of the present invention are described below in accordance with the drawings. 1 is a diagram of a chain wheel in which the pedaling force detecting device of the present invention is assembled, and FIG. 2 is a diagram showing a state of the embodiment of the present invention in a cross section, and FIG. 3 is a sprocket wheel. , the outer drive wheel, the inner drive wheel and the bush plate pattern, the fourth figure is the outer sensor block wheel, the inner sensor block wheel pattern, the fifth picture is when there is no pedal effort The internal diagram of the toothed disc, the sixth figure is the internal explanatory diagram of the toothed disc when the pedaling force is applied, the seventh figure is the internal explanatory diagram of the toothed disc when the maximum pedaling force is applied, and the eighth figure is the internal sensing when there is no pedaling effort FIG. 9 is a diagram showing the relationship between the opening of the blocking wheel and the opening of the external sensor blocking wheel, and FIG. 9 is a relationship diagram of the opening of the inner sensor blocking wheel and the opening of the external sensor blocking wheel when the pedaling force is applied. Fig. 10 is a diagram showing the relationship between the inner sensor blocking wheel opening portion and the outer sensor blocking wheel opening portion when the maximum pedaling effort is applied, and Fig. 11 is another embodiment of the blocking wheel. Further, Fig. 3 and Figs. 5 to 7 are views seen from the crank side.

First, the basic structure of a toothed disc in which the pedaling force detecting device of the present invention is assembled will be described. As shown in FIG. 2, the outer drive wheel 5, the bushing plate 8, the inner drive wheel 7, and the inner plate 11 are integrally fixed to the crank 3 by the unit fixing bolts 27.

The sprocket 6 is sandwiched between the outer drive wheel 5 and the inner drive wheel 7, and has a bushing plate 8 having a thickness (0.1 mm to 0.2 mm thickness) thicker than the thickness of the sprocket 6, and It is maintained to be rotatable relative to the outer drive wheel 5 and the inner drive wheel 7 by a certain angle. Since it is set to be rotatable at a certain angle, as shown in FIGS. 3 and 5, the sprocket 6 is provided with plural numbers. A long hole 6b is provided, and the outer drive wheel 5 is provided with a plurality of stopper tips 26. The stopper tip 26 can only rotate within the range of the elongated hole 6b, and as a result, the sprocket 6 can be rotated by a certain angle with respect to the outer drive wheel 5 and the inner drive wheel 7.

An inner cover 12 that can rotate the inner panel 11 is provided on the outer peripheral portion of the inner panel 11, and the outer cover 4 is fixed to the crank 3. In order to smoothly rotate the inner panel, the resin bush 13 is press-fitted into the inner lid 12.

As shown in Fig. 3, a plurality of spring opening portions 6a for accommodating the spring 22 are provided in the sprocket 6, and as shown in Fig. 5, the pressurizing receiving means 23 is rotatably held at one end by the tip 24. . Further, as shown in FIG. 3, the outer drive wheel 5 and the inner drive wheel 7 are provided with a plurality of spring opening portions 5a and 7a which are larger than the outer diameter of the spring 22 so as not to be in contact with each other, and are externally driven. A plurality of pressurizing means 5aa and/or 7aa are provided at one end of the spring opening 5a of the wheel 5 and/or the spring opening 7a of the inner drive wheel 7.

As shown in Fig. 5, for the purpose of uniformly receiving the force of the pressurizing operation means 5aa and/or 7aa, the pressurizing assisting member 25 is provided at one end of the spring 22, and is housed in the sprocket 6 without looseness. The spring opening 6a.

The cylindrical inner sensor blocking wheel 10 having a plurality of sensor opening portions 10a on the side of the cylinder as shown in Fig. 4 is fixed by bolts 20 on the concentric circle with the shaft center of the sprocket 6 The drive wheel 7 is driven in the toothed disc formed as described above.

Further, a cylindrical outer sensor blocking wheel 9 having a plurality of sensor opening portions 9a on the side surface of the cylinder is fixed to the sprocket 6 by bolts 19 concentrically with the center of the shaft of the sprocket 6.

The sensor opening portion 10a of the inner sensor blocking wheel 10 and the sensor opening portion 9a of the outer sensor blocking wheel 9 are as shown in FIG. 8, and each sensor opening is used when there is no pedaling effort. The manner in which the portions are uniform is set on the normal line with respect to the axial center of the sprocket 6.

The U-shaped photo sensor 14 fixed to the sensor case 15 by the bolt 21 is attached to the sensor case 15 so as to sandwich the sensor opening 10a and the sensor opening 9a. It is fixed to the inner cover 12 by the bolts 28. More specifically, the light-emitting portion 14a of the photo sensor 14 is positioned outside the sensor opening 9a of the outer sensor blocking wheel 9, and the light-receiving portion 14b reaches the sensor of the inner sensor blocking wheel 10. The inside of the opening 10a is provided on the normal line of the sensor opening 9a and the sensor opening 10a. Needless to say, the light-emitting portion 14a and the light-receiving portion 14b may be reversed even inside and outside. Furthermore, the light sensor 14 is covered by the sensor cover 16.

The toothed disc is rotatably mounted to the center shaft assembly 2 assembled in the frame 1 by a crank fixing bolt 17. The rotation stopper 18 is previously fixed to the frame 1 by the center shaft assembly 2 so as not to be rotatable, and the recess 15a of the aforementioned sensor case 15 is attached to the center shaft assembly in such a manner as to be fitted into the stopper portion 18a of the rotation stopper 18. 2, whereby the inner cover 12, that is, the photo sensor 14, is held to be non-rotatable.

The details of the present invention have been described in the above constitution. Here, a power-assisted bicycle having a structure in which a toothed disc of a pedal and a rear wheel train are coupled by a chain and the rear wheel is rotated by the rotation of the toothed disc due to the pedaling effort is described as in the case of a general bicycle. In addition, it can also be applied to a bicycle or other method in which the belt is connected to the rear wheel by way of a non-chain. A bicycle that is coupled to the rear wheel by a gear and a shaft. That is, the present invention relates to the invention of the pedaling force detecting device, not to the form of the bicycle.

The state in which the pedaling force is not applied to the pedal, that is, during the stop or inertial travel, the spring 22 maintains the natural length, and the relationship between the sprocket 6 and the outer drive wheel 5 and the inner drive wheel 7 is as shown in Fig. 5. Further, the sensor opening portion 10a of the inner sensor blocking wheel 10 and the sensor opening portion 9a of the outer sensor blocking wheel 9 are juxtaposed on the normal line as shown in FIG.

When the pedaling force is applied to the pedal in this state, the sprocket 6 is coupled to the rear wheel by the chain, so that the stationary state is maintained, and the outer driving wheel 5 and the inner driving wheel 7 integrated with the crank 3 are directed to FIG. 4 to The direction of the arrow P on the pattern shown in Fig. 7 starts to rotate right.

When the outer driving wheel 5 and the inner driving wheel 7 start to rotate, the pressing auxiliary rib member 25 is added in the direction of the arrow P by the pressing action means 5aa and/or 7aa of the outer driving wheel 5 and/or the inner driving wheel 7. The spring 22 is pressed in a manner as shown in Fig. 6. When the spring 22 is telescoped to a certain extent, the spring force is applied to the grounding impedance of the rear wheel by the connecting chain, and the rear wheel rotates after the sprocket starts to rotate.

At this time, the sensor opening portion 10a of the inner sensor blocking wheel 10 and the sensor opening portion 9a of the outer sensor blocking wheel 9 which are arranged in the normal line are as shown in FIG. The circumferential direction is staggered, and the actual opening portion is less than when the pedaling force is not applied.

In the light sensor 14a and the light receiving unit 14b, the sensor opening portion 10a and the sensor opening portion 9a are provided, but it is preferable that the light sensor 14 is provided in the opening portion. The light-emitting portion 14a and the light-receiving portion 14b are provided on the substantially center line Q.

As described above, Fig. 8 shows that the circumferential distance of the opening is L1 in a state where the pedaling force is not applied. When the pedaling force is applied in this state, the rotational direction of the sensor opening 10a and the sensor opening 9a changes as shown in FIG. 9, and the circumferential distance of the opening is L2 which is shorter than L1. Further, when a larger maximum pedaling effort is applied, the relative position of the rotation of the sensor opening 10a and the sensor opening 9a is changed as shown in FIG. 10, and the circumferential distance of the opening is proportional to L2. Still short L3.

The photo sensor 14 determines the magnitude of the pedaling effort by reading the circumferential direction of the opening. In detail, the photo sensor 14 transmits infrared rays or visible rays from the light-emitting portion 14a toward the light-receiving portion 14b. The sensor opening portion 10a of the inner sensor blocking wheel 10 and the sensor opening portion 9a of the outer sensor blocking wheel 9 sequentially pass between the light-emitting portion 14a and the light-receiving portion 14b by the rotation of the toothed disc.

Furthermore, the time during which the red or visible line between the one-rotation is blocked or the time of transmission is read. For example, as shown in Fig. 8, the opening portion is opened 100% (L1) when there is no pedaling effort. When the pedaling effort is applied, the opening is about 70% (L2) as shown in Fig. 9. Further, when a larger pedal pedaling force is applied, the opening portion is about 25% (L3) as shown in Fig. 10. The pedaling effort is calculated based on the ratio of the aperture ratio of the opening when the pedaling force is not applied to the aperture ratio of the opening when the pedaling force is applied.

The information of the pedaling effort calculated in this way is transmitted to the arithmetic processing unit 30 that performs the arithmetic processing via the communication line 29 to determine the output of the motor. Again, by the side of the light sensor 14 Both of the power processing units 30 and the power supply unit can be configured to transmit information wirelessly without using a communication line. Therefore, since wiring is not required, the appearance is neat and precise, and the degree of freedom in setting the processing unit 30 is also Big.

Further, even when the maximum pedaling force is applied, the opening is not completely blocked, and the light sensor 14 can calculate the pedaling force not only as described above but also when the toothed disc is rotated by the slight opening. When the opening portion and the blocking portion pass through each other, it is also possible to determine whether or not the toothed disc is rotating, and the rotation speed of the toothed disc can be determined by equally dividing the opening portion.

That is, when a commercially available electric assist vehicle applies a single-leg load to the pedal to stop by waiting for the signal, when a load of a certain amount or more is applied to the pedal, there is a danger that the motor will issue an output command to rotate the wheel. According to the present invention, since it is determined that the toothed disc is not rotated, the motor can output a command without being commanded, and therefore, since the rotational speed of the toothed disc can be calculated, the current gear ratio can be easily calculated after the rotation speed information of the wheel is matched.

Further, the sensor opening portion 10a of the inner sensor blocking wheel 10 and the sensor opening portion 9a of the outer sensor blocking wheel 9 form a hole shape in FIG. 4, even if it is as shown in FIG. The shape of the U-shaped opening formed as a single side opening can also achieve the effects of the present invention.

Moreover, in the present invention, the arithmetic processing device can be integrally attached to the toothed disc. For example, as shown in Fig. 12, the arithmetic processing device can be assembled in the inner cover 12. As described above, the inner cover 12 is held in a non-rotatable manner with respect to the frame 1, and therefore, the space is used to mount the operation of the frame 1. According to the processing apparatus, it is possible to provide a toothed disc which is inexpensive and has excellent assembly workability and has a simplified pedaling force detecting device and arithmetic processing device.

[Effect of the invention]

Conventionally, in the pedaling force detecting device that expands and contracts in the rotational direction of the elastic body assembled in the toothed disc, it is necessary to have a structure in which the expansion and contraction of the elastic body in the rotational direction is converted into the axial direction. Therefore, the apparatus is complicated and the number of parts is large. Further, since the accuracy of the parts is required, there is a problem that the cost becomes high, and other conventional products are loose in the axial direction in the structure. Therefore, the distance between the sensor and the protruding portion is unstable, and there is a problem that the accuracy is deteriorated.

In the present invention, in the pedaling force detecting device that utilizes the expansion and contraction of the elastic body assembled in the toothed disk in the rotational direction, the cylindrical inner sensor blocking wheel train having a plurality of openings on the side surface of the cylinder is integrally provided to The inner driving wheel is disposed on the side surface of the cylinder and has a plurality of openings on the substantially normal line of the opening of the inner driving wheel. The cylindrical outer sensor blocking wheel system is integrally disposed on the sprocket, and the reading basis is set. A sensor for displacing the opening of the inner sensor blocking wheel and the opening of the outer sensor blocking wheel by the change of the pedaling force of the toothed disc, thereby providing a simple, inexpensive and high-structure design Accurate electric-assisted bicycle pedaling force detection device.

In addition, by providing a power source such as a battery on both sides of the sensor and the arithmetic processing device, information can be transmitted wirelessly without using a communication line. Therefore, since wiring is not required, the appearance is neat and precise, and the position of the arithmetic processing device is set. The degree of freedom is also large.

In addition, by integrally attaching the arithmetic processing device to the toothed disc, it is possible to provide a toothed disc which is inexpensive and has excellent assembly workability and has a simplified pedaling force detecting device and arithmetic processing device.

1‧‧‧ box

2‧‧‧Axis components

3‧‧‧ crank

4‧‧‧ Cover

5‧‧‧Outer drive wheel

5a‧‧‧Openings for springs of outer drive wheels

5aa‧‧‧The driving action of the outer drive wheel

6‧‧‧Sprocket

6a‧‧‧Spring opening for sprocket

6b‧‧‧ long hole

7‧‧‧Inner drive wheel

7a‧‧‧Openings for springs for inner drive wheels

7aa‧‧‧The driving action of the inner driving wheel

8‧‧‧Blinded board

9‧‧‧External sensor blocking wheel

9a‧‧‧The opening of the sensor for the blocking wheel of the external sensor

10‧‧‧ Inside the sensor's blocking wheel

The opening of the sensor for the blocking wheel of the sensor in 10a‧‧

11‧‧‧ inner board

12‧‧‧ Inner cover

13‧‧‧Resin bushing

14‧‧‧Light sensor

14a‧‧‧Light sensor light department

14b‧‧‧Light sensor light receiving department

15‧‧‧Sensor box

15a‧‧‧Sensor box recess

16‧‧‧Sensor box

17‧‧‧Crank fixing bolt

18‧‧‧Rotary Stopper

18a‧‧‧Stopper of the rotary stopper

19, 20, 21, 28‧‧‧ bolts

22‧‧‧ Spring

23‧‧‧ Pressurization means

24‧‧‧ tip

25‧‧‧ Pressurization aids

26‧‧‧Stopper

27‧‧‧Unit fixing bolt

29‧‧‧Communication line

30‧‧‧Operation processing device

Fig. 1 is a view showing a toothed disc in which the pedaling force detecting device of the present invention is assembled.

Fig. 2 is a cross-sectional view showing the embodiment of the present invention.

Figure 3 is a diagram of a sprocket, an outer drive wheel, an inner drive wheel, and a bushing plate.

Figure 4 is a diagram of the outer sensor blocking wheel and the inner sensor blocking wheel.

Fig. 5 is an internal explanatory view of the toothed disc when there is no pedaling effort.

Fig. 6 is an internal explanatory view of the toothed disc when the pedaling force is applied.

Fig. 7 is an internal explanatory view of the sprocket when the maximum pedaling effort is applied.

Fig. 8 is a diagram showing the relationship between the inner sensor blocking wheel opening portion and the outer sensor blocking wheel opening portion when there is no pedaling effort.

Fig. 9 is a diagram showing the relationship between the inner sensor blocking wheel opening portion and the outer sensor blocking wheel opening portion when the pedaling effort is applied.

Fig. 10 is a diagram showing the relationship between the inner sensor blocking wheel opening portion and the outer sensor blocking wheel opening portion when the maximum pedaling effort is applied.

Figure 11 is another embodiment of a blocking wheel.

Fig. 12 is a view showing the assembly of the arithmetic processing device of the present invention to the inner cover.

1‧‧‧ box

2‧‧‧Axis components

3‧‧‧ crank

4‧‧‧ Cover

5‧‧‧Outer drive wheel

6‧‧‧Sprocket

7‧‧‧Inner drive wheel

8‧‧‧Blinded board

9‧‧‧External sensor blocking wheel

9a‧‧‧The opening of the sensor for the blocking wheel of the external sensor

10‧‧‧ Inside the sensor's blocking wheel

The opening of the sensor for the blocking wheel of the sensor in 10a‧‧

11‧‧‧ inner board

12‧‧‧ Inner cover

13‧‧‧Resin bushing

14‧‧‧Light sensor

14a‧‧‧Light sensor light department

14b‧‧‧Light sensor light receiving department

15‧‧‧Sensor box

15a‧‧‧Sensor box recess

16‧‧‧Sensor box

17‧‧‧Crank fixing bolt

18‧‧‧Rotary Stopper

18a‧‧‧Stopper of the rotary stopper

19, 21‧‧‧ bolts

23‧‧‧ Pressurization means

24‧‧‧ tip

26‧‧‧Stopper

27‧‧‧Unit fixing bolt

29‧‧‧Communication line

Claims (3)

A pedal-assisted force detecting device for a power-assisted bicycle, comprising: a driving wheel and an inner driving wheel fixed to the crank, and the opposite of the outer driving wheel and the inner driving wheel, and configured to be opposite to the outer driving wheel and the inner The driving wheel rotates a sprocket of a certain angle, and the outer driving wheel and/or the inner driving wheel have a plurality of pressing action means, and the sprocket has a plurality of pressing receiving means opposite to the pressing action means, Between the pressurizing operation means and the pressurizing receiving means, a plurality of elastic bodies that expand and contract in accordance with the amount of change in the rotational direction of the outer drive wheel and the inner drive wheel and the sprocket are disposed, whereby the outer drive wheel and the outer drive wheel are In the toothed disc formed by indirectly connecting the inner driving wheel and the sprocket, a cylindrical inner sensor blocking wheel system having a plurality of openings on the side surface of the cylinder is integrally provided to the inner driving wheel. The sensor-shaped blocking wheel train having the plurality of openings on the side surface of the cylinder and having substantially the same opening on the normal line of the inner sensor blocking wheel is integrally disposed on the sprocket, And a sensor for reading the offset of the opening of the inner sensor blocking wheel and the opening of the outer sensor blocking wheel generated by the change of the pedaling force of the toothed disc is set, and the toothed disc is disposed on the toothed disc An arithmetic processing device that arithmetically processes information read by the aforementioned sensor is incorporated therein. The pedaling force detecting device for a power-assisted bicycle according to claim 1, wherein a light sensor is included as the sensor. The pedaling force detecting device for a power-assisted bicycle according to the first aspect of the invention, wherein the information read by the sensor is transmitted to the arithmetic processing device by wireless.