Bicycle crank arm assembly
First Claim
Patent Images
1. A bicycle crank arm assembly comprising:
- a bicycle crank arm including a pedal shaft joint part configured to be joined to a pedal shaft, the bicycle crank arm being configured to be rotatable about an axis of a crank spindle;
a first detecting circuit configured to detect a force acting in a first direction when a load is applied to the bicycle crank arm through the pedal shaft, the first direction being a direction of a tangent at the pedal shaft to an imaginary circle about the axis of the crank spindle;
a second detecting circuit configured to detect a force acting in a second direction when the load is applied to the bicycle crank arm through the pedal shaft, the second direction being a direction parallel to a radial direction of the imaginary circle about the axis of the crank spindle; and
a third detecting circuit configured to detect a moment acting about an axis intersecting with the crank spindle and the pedal shaft of the bicycle crank arm when the load is applied to the bicycle crank arm through the pedal shaft,the bicycle crank arm including an attachment surface intersecting with the axis of the crank spindle, the attachment surface facing a vehicle width direction,the first detecting circuit including at least one first strain sensor mounted to the attachment surface,the second detecting circuit including at least one second strain sensor mounted to the attachment surface, andthe third detecting circuit including at least one third strain sensor mounted to the attachment surface.
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Abstract
A bicycle crank arm assembly basically includes a bicycle crank arm and first to third detecting circuits. The first detecting circuit is configured to detect a force acting in a first direction. The second detecting circuit is configured to detect a force acting in a second direction. The third detecting circuit is configured to detect a moment. The first detecting circuit includes a first strain sensor that is mounted to an attachment surface. The second detecting circuit includes a second strain sensor that is mounted to the attachment surface. The third detecting circuit includes a third strain sensor that is mounted to the attachment surface.
23 Citations
35 Claims
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1. A bicycle crank arm assembly comprising:
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a bicycle crank arm including a pedal shaft joint part configured to be joined to a pedal shaft, the bicycle crank arm being configured to be rotatable about an axis of a crank spindle; a first detecting circuit configured to detect a force acting in a first direction when a load is applied to the bicycle crank arm through the pedal shaft, the first direction being a direction of a tangent at the pedal shaft to an imaginary circle about the axis of the crank spindle; a second detecting circuit configured to detect a force acting in a second direction when the load is applied to the bicycle crank arm through the pedal shaft, the second direction being a direction parallel to a radial direction of the imaginary circle about the axis of the crank spindle; and a third detecting circuit configured to detect a moment acting about an axis intersecting with the crank spindle and the pedal shaft of the bicycle crank arm when the load is applied to the bicycle crank arm through the pedal shaft, the bicycle crank arm including an attachment surface intersecting with the axis of the crank spindle, the attachment surface facing a vehicle width direction, the first detecting circuit including at least one first strain sensor mounted to the attachment surface, the second detecting circuit including at least one second strain sensor mounted to the attachment surface, and the third detecting circuit including at least one third strain sensor mounted to the attachment surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A bicycle crank arm assembly comprising:
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a bicycle crank arm including a pedal shaft joint part configured to be joined to a pedal shaft, the bicycle crank arm being configured to be rotatable about an axis of a crank spindle; and a second detecting circuit configured to detect a force acting in a second direction when a load is applied to the bicycle crank arm through the pedal shaft, the second direction being parallel to a radial direction of an imaginary circle about the axis of the crank spindle, the bicycle crank arm including an attachment surface intersecting with the axis of the crank spindle, the second detecting circuit including a second strain sensor and a fourth strain sensor, both the second strain sensor and the fourth strain sensor being mounted to the attachment surface, the second strain sensor having a detecting direction forming an angle within a range of 25 degrees or less together with the second direction in a view seen from a direction parallel to an axial direction of the crank spindle, and the fourth strain sensor having a detecting direction tilting at an angle within a range of 25 degrees or less relatively to a first direction in the view seen from the direction parallel to the axial direction of the crank spindle, the first direction being arranged orthogonally to the second direction.
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35. A bicycle crank arm assembly comprising:
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a bicycle crank arm including a pedal shaft joint part configured to be joined to a pedal shaft, the bicycle crank arm being configured to be rotatable about an axis of a crank spindle; and a third detecting circuit configured to detect a moment acting about an axis intersecting with the crank spindle and the pedal shaft of the bicycle crank arm when a load is applied to the bicycle crank arm through the pedal shaft, the bicycle crank arm including an attachment surface intersecting with the axis of the crank spindle, the third detecting circuit including a third strain sensor mounted to the attachment surface, and the third strain sensor having a detecting direction tilting at an angle within a range of 25 degrees or less relatively to a third direction in a view seen from a direction parallel to an axial direction of the crank spindle, the third direction tilting at an angle of 45 degrees relatively to a first direction, the first direction being a direction of a tangent at the pedal shaft to an imaginary circle about the axis of the crank spindle.
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Specification