Pickup coil for sensing rotary speed of engine, the coil including adjustable weight member
AssigneeHonda Motor Co., Ltd.
InventorMasaki Yamazaki
Life of this patent
Estimating the term…
Abstract
A pickup coil includes a sensing unit having an iron core, a permanent magnet magnetically coupled to a rear end position of the iron core, and a coil for sensing a change of magnetic flux occurring in the iron core; and a supporting frame member. The sensing unit is molded with a cup-shaped resin case. The sensing unit is integrally molded with the supporting frame member and is mounted on a mounting object via the supporting frame member. A plurality of weight units for adjusting a characteristic frequency of the coil is stored in a weight storage section formed inside the resin case at a position spaced away from the supporting frame member. The weight storage section is sized such that one or more weight units are accommodated therein.
Claims20
A pickup coil comprising
- a sensing unit,
- a supporting frame member,
- a case member attached to said sensing unit, and
- a weight member arranged in said case member;
- said sensing unit comprising:
- an iron core;
- a permanent magnet magnetically coupled to the iron core;
- and
- a coil for sensing a change of magnetic flux occurring in the iron core;
- wherein the iron core, the permanent magnet, and the coil are integrally molded with the supporting frame member, and are configured to be mounted on a mounting object via the supporting frame member;
- wherein the weight member is mounted on said case member arranged on an end portion of the sensing unit, which is located at a position spaced away from the supporting frame member;
- wherein said weight member has a threaded hole formed therein, and
- wherein said weight member is to receive at least one additional weight member and secure said at least one additional weight member thereto.
A pickup coil for sensing a rotary speed of an engine, said pickup coil comprising:
- a sensing unit;
- a case member attached to said sensing unit;
- a weight member arranged in said case member;
- and
- a supporting frame member attached to said sensing unit;
- and
- said case member attached to an end portion of the sensing unit at a position spaced away from said supporting member;
- said weight member comprising at least one weight unit;
- wherein said sensing unit is disposed in a molded cup-shaped resin case;
- wherein said weight case member is operatively attached to said resin case;
- wherein said weight unit has a threaded hole formed therein, and
- wherein said weight unit is to receive at least one additional weight unit and secure said at least one additional weight unit thereto.
A pickup coil for sensing a rotary speed of an engine, said pickup coil comprising:
- a sensor assembly disposed in a molded cup-shaped resin case, said sensor assembly comprising
- an iron core having a rectangular columnar shape;
- a permanent magnet magnetically coupled with the iron core;
- a base plate magnetically coupled with the permanent magnet;
- a bobbin having said iron core penetrated therethrough;
- and
- a coil wound around said bobbin;
- a supporting frame member attached to said sensor assembly;
- a case member attached to said sensing unit;
- and
- a weight member disposed in said case member arranged to an end portion of the sensor assembly at a position spaced away from the supporting member, said weight member comprising first weight unit;
- wherein said first weight unit has a threaded hole formed therein, and is to receive a second weight unit and secure said second weight unit thereto.
Dependencies are inferred from the claim text.