Bicycle pedal

1. A bicycle pedal comprising:

a pedal spindle including a crank arm mounting part;

a pedal body rotatably mounted on the pedal spindle about a center spindle axis;

a first shear force sensor disposed on the pedal spindle to detect a first shear component of a pedaling force with respect to the center spindle axis;

a second shear force sensor disposed on the pedal spindle to detect a second shear component of the pedaling force with respect to the center spindle axis, each of the first and second shear force sensors including a strain gauge having a longitudinal axis that is not parallel to the center spindle axis, the longitudinal axes of the strain gauges of the first and second shear force sensors extending in a direction parallel to a measurement direction of a grid of the strain gauges of the first and second shear force sensors, respectively;

a first bending force sensor disposed on the pedal spindle to detect a first bending component of the pedaling force with respect to the center spindle axis; and

a second bending force sensor disposed on the pedal spindle to detect a second bending component of the pedaling force with respect to the center spindle axis, each of the first and second bending force sensors including a strain gauge having a longitudinal axis that is parallel to the center spindle axis, the longitudinal axes of the first and second bending force sensors extending in a direction parallel to a measurement direction of a grid of the strain gauges of the first and second bending force sensors, respectively,

the pedal spindle further including a first bore extending axially at least through the crank arm mounting part, and at least one second bore extending from an outer peripheral surface of the pedal spindle to the first bore, and

each of the first and second shear force sensors and the first and second bending force sensors having a communication line that extends through the at least one second bore and the first bore.

2. The bicycle pedal according to claim 1 , wherein

the first and second shear force sensors are disposed on the outer peripheral surface of the pedal spindle.

3. The bicycle pedal according to claim 1 , wherein

the first and second bending force sensors are disposed on the outer peripheral surface of the pedal spindle.

4. The bicycle pedal according to claim 3 , wherein

the first and second shear force sensors are disposed on the outer peripheral surface of the pedal spindle.

5. The bicycle pedal according to claim 4 , wherein

the first shear force sensor is circumferentially spaced from the second shear force sensor about the outer peripheral surface with respect to the center spindle axis, and

the first bending force sensor is circumferentially spaced from the second bending force sensor about the outer peripheral surface with respect to the center spindle axis.

6. The bicycle pedal according to claim 5 , wherein

the pedal spindle further includes a pedal body support part and a sensor support part, the pedal body support part rotatably supporting the pedal body, the sensor support part supporting the first and second shear force sensors and the first and second bending force sensors, and the sensor support part being axially disposed between the crank arm mounting part and the pedal body support part.

7. The bicycle pedal according to claim 5 , wherein

the first and second shear force sensors are selected from a first group consisting of resistance strain gauges and semiconductor strain gauges, and

the first and second bending force sensors are selected from a second group consisting resistance strain gauges and semiconductor strain gauges.

8. The bicycle pedal according to claim 5 , wherein

the first and second shear force sensors are disposed ninety degrees apart with respect to the center spindle axis, and

the first and second bending force sensors are disposed ninety degrees apart with respect to the center spindle axis.

9. The bicycle pedal according to claim 5 , further comprising

a third shear force sensor arranged relative to the pedal spindle to detect a third shear component of the pedaling force with respect to the center spindle axis;

a fourth shear force sensor arranged relative to the pedal spindle to detect a fourth shear component of the pedaling force with respect to the center spindle axis;

a third bending force sensor arranged relative to the pedal spindle to detect a third bending component of the pedaling force with respect to the center spindle axis; and

a fourth bending force sensor arranged relative to the pedal spindle to detect a fourth bending component of the pedaling force with respect to the center spindle axis.

10. The bicycle pedal according to claim 9 , wherein

the first, second, third and fourth shear force sensors are disposed on the outer peripheral surface of the pedal spindle, and

the first, second, third and fourth bending force sensors are disposed on the outer peripheral surface of the pedal spindle.

11. The bicycle pedal according to claim 10 , wherein

the first, second, third and fourth shear force sensors are circumferentially spaced from each other about the outer peripheral surface with respect to the center spindle axis, and

the first, second, third and fourth shear bending force sensors are circumferentially spaced from each other about the outer peripheral surface with respect to the center spindle axis.

12. The bicycle pedal according to claim 11 , wherein

the first, second, third and fourth shear force sensors are selected from a first group consisting of resistance strain gauges and semiconductor strain gauges, and

the first, second, third and fourth bending force sensors are selected from a second group consisting resistance strain gauges and semiconductor strain gauges.

13. The bicycle pedal according to claim 10 , wherein

the first, second, third and fourth shear force sensors are disposed ninety degrees apart with respect to the center spindle axis, and

the first, second, third and fourth bending force sensors are disposed ninety degrees apart with respect to the center spindle axis.

14. The bicycle pedal according to claim 1 , wherein the at least one second bore includes a plurality of second bores.

15. The bicycle pedal according to claim 1 , wherein

the first shear force sensor is disposed opposite to the first bending force sensor with respect to the center spindle axis, and

the second shear force sensor is disposed opposite to the second bending force sensor with respect to the center spindle axis.

16. The bicycle pedal according to claim 1 , wherein

the first shear force sensor is angularly aligned with the first bending force sensor with respect to the center spindle axis, and

the second shear force sensor is angularly aligned with the second bending force sensor with respect to the center spindle axis.

17. The bicycle pedal according to claim 1 , further comprising

an inclination sensor attached to one of the pedal body and the pedal spindle.

18. A bicycle pedaling state apparatus including the bicycle pedal according to claim 1 , further comprising

a controller configured to be detachably fixed to the crank arm and in communication with the first and second shear force sensors and the first and second bending force sensors.

19. The bicycle pedaling state apparatus according to claim 18 , wherein

the controller is programmed to calculate a pedaling power during a pedal cycle based on data received from the first and second shear force sensors and the first and second bending force sensors.

20. The bicycle pedaling state apparatus according to claim 19 , further comprising

a cadence sensor in communication with the controller.

21. A bicycle pedaling state apparatus including the bicycle pedal according to claim 1 , further comprising

a wireless transmitter electrically connected to the first and second shear force sensors and the first and second bending force sensors.

22. A bicycle pedal spindle comprising:

a crank arm mounting part;

a pedal body support part configured to rotatably support a pedal body about a center spindle axis; and

a sensor support part including

a first shear force sensor disposed on the pedal spindle to detect a first shear component of a pedaling force with respect to the center spindle axis;

a second shear force sensor arranged disposed on the pedal spindle to detect a second shear component of the pedaling force with respect to the center spindle axis, each of the first and second shear force sensors including a strain gauge having a longitudinal axis that is not parallel to the center spindle axis, the longitudinal axes of the strain gauges of the first and second shear force sensors extending in a direction parallel to a measurement direction of a grid of the strain gauges of the first and second shear force sensors, respectively;

a first bending force sensor disposed on the pedal spindle to detect a first bending component of the pedaling force with respect to the center spindle axis; and

a second bending force sensor disposed on the pedal spindle to detect a second bending component of the pedaling force with respect to the center spindle axis, each of the first and second bending force sensors including a strain gauge having a longitudinal axis that is parallel to the center spindle axis, the longitudinal axes of the first and second bending force sensors extending in a direction parallel to a measurement direction of a grid of the strain gauges of the first and second bending force sensors, respectively,

the pedal spindle further including a first bore extending axially at least through the crank arm mounting part, and at least one second bore extending from an outer peripheral surface of the pedal spindle to the first bore, and

each of the first and second shear force sensors and the first and second bending force sensors having a communication line that extends through the at least one second bore and the first bore.