Position measuring device of electromagnetically operated engine valve drive system and method for attaching the same
AssigneeNissan Motor Co., Ltd.
InventorsHiroshi Yoneda, Masahiro Kurita, Yasuo Kouda
Life of this patent
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Abstract
An engine valve (6) such as an intake valve or exhaust valve is driven to open or close a corresponding intake or exhaust port by attracting an armature (1) onto one of first and second electromagnets (2, 3) and a position of the armature, viz., the position of the engine valve is measured by a permanent magnet (7) and a Hall effect device (8). An adhesive layer (9) whose hardness is lower than the drive axle (5) is used to attach the permanent magnet (7) onto the drive axle (5).
Claims34
A method for attaching a position measuring device of an electromagnetic actuator, the electromagnetic actuator comprising a movable section and a permanent magnet used to detect a displacement position of the movable section, the method comprising attaching the permanent magnet onto the movable section elastically via a predetermined material that has a lower hardness than that of the movable section, wherein a magnetic shield portion is disposed between the movable section and the permanent magnet.
A position measuring device for an electromagnetic actuator having a movable section associated with a valve comprising:
- a permanent magnet attached onto the movable section elastically via a predetermined material that has a lower hardness than that of the movable section to detect a displacement position of the movable section;
- and
- a component arranged to detect a magnetic field of the permanent magnet for measuring the position of the movable section,
- wherein the predetermined material is an adhesive layer enclosing the permanent magnet,
- wherein the movable section comprises a small diameter section and a hollow cylindrical member whose inner periphery is fitted into an outer periphery of the small diameter section, wherein the adhesive layer is interposed between the inner periphery of the hollow cylindrical member and an outer periphery of the permanent magnet.
An electromagnetic valve actuator comprising:
- a movable member associated with a valve;
- a magnet utilized in a position measurement of the movable member;
- a support member arranged between the movable member and the magnet, the support member elastically mounting the magnet to the movable member, a hardness of the support member being lower than that of the movable member;
- and
- a component arranged to detect a magnetic field of the magnet for measuring the position of the movable member,
- wherein the movable member includes a sleeve attached at an end portion thereof, the support member mounts the magnet to the sleeve,
- wherein a gap is arranged between the end portion of the movable member and the magnet so as to provide a magnetic shield.
A method for attaching a position measuring device of an electromagnetic actuator, the electromagnetic actuator comprising a movable section and a permanent magnet used to detect a displacement position of the movable section, the method comprising attaching the permanent magnet onto the movable section via a predetermined material that has a lower hardness than that of the movable section,
- wherein the predetermined material is a substantially cylindrical shaped material,
- wherein a magnetic shield portion is disposed between the movable section and the permanent magnet.
A position measuring device for an electromagnetic actuator having a movable section associated with a valve comprising:
- a permanent magnet attached onto the movable section via a predetermined material that has a lower hardness than that of the movable section to detect a displacement position of the movable section;
- and
- a component arranged to detect a magnetic field of the permanent magnet for measuring the position of the movable section,
- wherein the predetermined material is an adhesive layer enclosing the permanent magnet,
- wherein the movable section comprises a small diameter section and a hollow cylindrical member whose inner periphery is fitted into an outer periphery of the small diameter section, wherein the adhesive layer is interposed between the inner periphery of the hollow cylindrical member and an outer periphery of the permanent magnet.
Dependencies are inferred from the claim text.