Measuring device

Patent metadata

Field	Value
Publication number	US-9528892-B2
Application number	US-201314760232-A
Country	US
Kind code	B2
Filing date	Jan 11, 2013
Priority date	Jan 11, 2013
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

There is provided a measuring device capable of measuring a propulsion force and a loss force by using a simple method. A first detection circuit that is a bridge circuit, to which a first strain gauge and a second strain gauge disposed such that detection directions are parallel to a longitudinal direction of a crank are connected, detecting bending deformation x occurring in the crank, and a second detection circuit that is a bridge circuit, to which a third strain gauge disposed such that a detection direction is parallel to the longitudinal direction of the crank and a fourth strain gauge disposed such that a detection direction is perpendicular to the longitudinal direction of the crank are connected, detecting bending deformation y and tensile deformation z occurring in the crank are included.

First claim

The invention claimed is:

1. A measuring device comprising:
a first strain gauge, a second strain gauge, a third strain gauge, and a fourth strain gauge that are disposed on a side face that is a face of a crank parallel to a plane including a circle defined by rotational movement of the crank of a manpower machine;
a first detection circuit, to which the first strain gauge and the second strain gauge are connected, detecting a rotating-direction strain generated in a rotating direction of the crank;
a second detection circuit, to which the third strain gauge and the fourth strain gauge are connected, detecting at least one of an inward/outward strain generated in a direction perpendicular to the plane of the crank and a pulling-direction strain generated in a direction parallel to a longitudinal direction of the crank; and
a control unit measuring a propulsion force of the manpower machine based on the rotating-direction strain detected in the first detection circuit, and measuring a loss force of the manpower machine based on at least one of the inward/outward strain and the pulling-direction strain detected in the second detection circuit, wherein:
the first strain gauge, the second strain gage and the third strain gauge are arranged such that detection directions are parallel to the longitudinal direction of the crank, and
the fourth strain gauge is arranged such that a detection direction is perpendicular to the longitudinal direction of the crank.

2. The measuring device according to claim 1 , further comprising a correction section that corrects a mixed-in strain component other than the strains detected by each of the detection circuits based on an output of the first detection circuit and an output of the second detection circuit.

3. The measuring device according to claim 1 , wherein the first strain gauge and the second strain gauge are disposed to be symmetrical with respect to a center axis in the longitudinal direction of the side face of the crank.

4. The measuring device according to claim 2 , wherein the first strain gauge and the second strain gauge are disposed to be symmetrical with respect to a center axis in the longitudinal direction of the side face of the crank.

5. The measuring device according to claim 1 , wherein the third strain gauge and the fourth strain gauge overlap each other.

6. The measuring device according to claim 2 , wherein the third strain gauge and the fourth strain gauge overlap each other.

7. The measuring device according to claim 3 , wherein the third strain gauge and the fourth strain gauge overlap each other.

8. The measuring device according to claim 4 , wherein the third strain gauge and the fourth strain gauge overlap each other.

9. The measuring device according to claim 1 ,
wherein the first detection circuit and the second detection circuit are configured as bridge circuits,
wherein the first strain gauge and the second strain gauge are connected in series with a power supply in the bridge circuit configuring the first detection circuit,
wherein the third strain gauge and the fourth strain gauge are connected in series with a power supply in the bridge circuit configuring the second detection circuit, and
wherein resistors other than the first to fourth strain gauges of the bridge circuit configuring the first detection circuit and the bridge circuit configuring the second detection circuit are configured to have fixed resistance.

10. The measuring device according to claim 9 , wherein the fixed resistance is shared by the first detection circuit and the second detection circuit.

11. A measuring device comprising:
a first strain gauge, a second strain gauge, a third strain gauge, a fourth strain gauge, a fifth strain gauge, a sixth strain gauge, a seventh strain gauge, and an eighth strain gauge that are disposed on a side face that is a face of a crank parallel to a plane including a circle defined by rotational movement of the crank of a manpower machine;
a first detection circuit, to which the first strain gauge, the second strain gauge, the fifth strain gauge, and the sixth strain gauge are connected, detecting a rotating-direction strain generated in a rotating direction of the crank;
a second detection circuit, to which the third strain gauge, the fourth strain gauge, the seventh strain gauge, and the eighth strain gauge are connected, detecting at least one of an inward/outward strain generated in a direction perpendicular to the plane of the crank and a pulling-direction strain generated in a direction parallel to a longitudinal direction of the crank; and
a control unit measuring a propulsion force of the manpower machine based on the rotating-direction strain detected in the first detection circuit, and measuring a loss force of the manpower machine based on at least one of the inward/outward strain and the pulling-direction strain detected in the second detection circuit, wherein:
the first strain gauge, the second strain gauge, the third strain gauge, and the eighth strain gauge are arranged such that detection directions are parallel to the longitudinal direction of the crank,
the fourth strain gauge, the fifth strain gauge, the sixth strain gauge, and the seventh strain gauge are arranged such that detection directions are perpendicular to the longitudinal direction of the crank.

12. The measuring device according to claim 11 ,
wherein the first detection circuit and the second detection circuit are configured as bridge circuits,
wherein the first strain gauge and the sixth strain gauge, and the second strain gauge and the fifth strain gauge are connected diagonally in the bridge circuit configuring the first detection circuit, and
wherein the third strain gauge and the eighth strain gauge, and the fourth strain gauge and the seventh strain gauge are connected to positions of opposite angles in the bridge circuit configuring the second detection circuit.

13. A measuring method measuring a propulsion force and a loss force of a manpower machine by using a measuring device that includes:
a first strain gauge, a second strain gauge, and a third strain gauge that are disposed on a side face that is a face of a crank parallel to a plane including a circle defined by rotational movement of the crank of a manpower machine such that detection directions are disposed to be parallel to a longitudinal direction of the crank;
a fourth strain gauge disposed such that a detection direction is perpendicular to the longitudinal direction of the crank;
a first detection circuit, to which the first strain gauge and the second strain gauge are connected, detecting a rotating-direction strain generated in a rotating direction of the crank; and
a second detection circuit, to which the third strain gauge and the fourth strain gauge are connected, detecting at least one of an inward/outward strain generated in a direction perpendicular to the plane of the crank and a pulling-direction strain generated in a direction parallel to a longitudinal direction of the crank,
the measuring method comprising:
detecting the rotating-direction strain by using the first detection circuit;
measuring the propulsion force based on the rotating-direction strain detected in the detecting of the rotating-direction strain;
detecting at least one of the inward/outward strain and the pulling-direction strain by using the second detection circuit; and
measuring the loss force based on at least one of the inward/outward strain and the pulling-direction strain detected in the detecting of one of the inward/outward strain and the pulling-direction strain.

14. A measuring method measuring a p

Assignees

• Pioneer Corp

Inventors

• Kodama Yasuteru
• Mioka Nobuo
• Fujita Ryujiro
• Shioda Takehiko

Classifications

• G01L1/2206

  Special supports with preselected places to mount the resistance strain gauges; Mounting of supports · CPC title

• B62J50/20

  Information-providing devices · CPC title

• B62J2099/0013

  Operations & Transport · mapped topic

• B62J2099/0026

  Operations & Transport · mapped topic

• B62J2099/002

  Operations & Transport · mapped topic