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US 11,293,547 B2Granted
Rotation position detection device for change drum and motorcycle
AssigneeKawasaki Motors, Ltd.
InventorsMasashi Ono, Ichiro Tanaka, Kyohei Izumi
Life of this patent
Estimating the term…
Abstract
A rotation position detection device includes a change drum, a magnetic field generator, and a magnetic field detector. The magnetic field generator is fixed to the change drum and rotates along with the change drum to differentiate an ambient magnetic field. The magnetic field detector is formed separately from the magnetic field generator and fixed to a position at which a magnetic field changes in response to rotation of the magnetic field generator so as to detect the magnetic field and output a signal that depends on the rotational position of the change drum on the basis of the detection result.
Claims13
A rotation position detection device for a change drum, comprising:
- a magnetic field generator that is fixed to said change drum and that rotates along with said change drum to differentiate an ambient magnetic field, said change drum transmitting force necessary to shift a gear by rotating about a predetermined rotation axis;
- a magnetic field detector that is formed separately from said magnetic field generator and fixed to a position at which said magnetic field changes in response to rotation of said magnetic field generator, to detect said magnetic field and output a signal that depends on a rotational position of said change drum on the basis of a detection result;
- and
- a case that houses said change drum, wherein
- said magnetic field detector is disposed at a position inward of a wall of said case and opposing said magnetic field generator along a direction of said rotation axis,
- a through hole is formed in said wall,
- said magnetic field detector is held by a holder,
- said holder is inserted in said through hole to support said magnetic field detector,
- a fixing piece protrudes from an outer periphery of said holder, and
- said fixing piece is directly fixed to said wall with said holder inserted in said through hole such that said fixing piece protrudes in a direction away from said rotation axis, wherein
- said through hole is for guiding a signal output by said magnetic field detector to outside of said case, and said through hole is formed at a position away from an extension of said rotation axis.
8 more elements
A rotation position detection device for a change drum, comprising:
- a magnetic field generator that is fixed to said change drum and that rotates along with said change drum to differentiate an ambient magnetic field, said change drum transmitting force necessary to shift a gear by rotating about a predetermined rotation axis;
- a magnetic field detector that is formed separately from said magnetic field generator and fixed to a position at which said magnetic field changes in response to rotation of said magnetic field generator, to detect said magnetic field and output a signal that depends on a rotational position of said change drum on the basis of a detection result;
- and
- a case that houses said change drum, wherein
- said magnetic field detector is disposed at a position inward of a wall of said case and opposing said magnetic field generator along a direction of said rotation axis,
- a through hole is formed in said wall,
- said magnetic field detector is held by a holder,
- said holder is inserted in said through hole to support said magnetic field detector,
- a fixing piece protrudes from an outer periphery of said holder, and
- said fixing piece is directly fixed to said wall with said holder inserted in said through hole such that said fixing piece protrudes in a direction away from said rotation axis, wherein
- said change drum is formed in a stepped shape having different radial dimensions in a direction of extension of said rotation axis,
- said magnetic field generator is formed in a ring shape centered about said rotation axis, and
- said magnetic field generator has an external diameter dimension that is smaller than a maximum external diameter dimension of said change drum and greater than a minimum external diameter dimension of said change drum.
10 more elements
A rotation position detection device for a change drum, comprising:
- a magnetic field generator that is fixed to said change drum and that rotates along with said change drum to differentiate an ambient magnetic field, said change drum transmitting force necessary to shift a gear by rotating about a predetermined rotation axis;
- a magnetic field detector that is formed separately from said magnetic field generator and fixed to a position at which said magnetic field changes in response to rotation of said magnetic field generator, to detect said magnetic field and output a signal that depends on a rotational position of said change drum on the basis of a detection result;
- and
- a case that houses said change drum, wherein
- said magnetic field detector is disposed at a position inward of a wall of said case and opposing said magnetic field generator along a direction of said rotation axis,
- a through hole is formed in said wall,
- said magnetic field detector is held by a holder,
- said holder is inserted in said through hole to support said magnetic field detector,
- a fixing piece protrudes from an outer periphery of said holder, and
- said fixing piece is directly fixed to said wall with said holder inserted in said through hole such that said fixing piece protrudes in a direction away from said rotation axis, wherein
- said change drum has a press-fit part that protrudes along said rotation axis, and
- said magnetic field generator includes a ring-shaped permanent magnet having a through hole for fixation, and a shock-absorbing part that fixes said permanent magnet to said press-fit part while intervening between said press-fit part and said permanent magnet.
9 more elements
Dependencies are inferred from the claim text.