US 2004/0070295 A1Published application

Actuator for operating a transmission control valve of an automatic transmission apparatus

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorsHirohisa Ohta, Satoru Tokiya, Masayasu Miyajima, Shuzo Isozumi

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Abstract

A rotor having magnets composed of rare-earth magnets is rotatably disposed inside an exterior casing, a penetrating aperture is disposed through a first end of the exterior casing relative to a direction of a motor central axis, and a filter is disposed so as to cover the penetrating aperture from a second end of the exterior casing relative to the direction of the motor central axis. A shaft is mounted to a bush by screwing an external thread portion into an internal thread portion. An operating member is mounted integrally onto a second end portion of the shaft projecting outward from a penetrating aperture in a housing. A rotation-regulating projection portion of a guide member fixed to the shaft is fitted loosely into a guide groove disposed so as to extend along an inner wall surface of a central aperture of the housing in the direction of the motor central axis.

Claims11

Dependent claims

An actuator for operating a transmission control valve of an automatic transmission apparatus, said actuator comprising:

a stepping motor comprising:
an exterior casing having a first end and a second end relative to a motor central axis;
a motor main body composed of:
a stator disposed inside said exterior casing;
and
a rotor rotatably disposed inside said stator around said motor central axis, said rotor being constructed by mounting magnets constituting magnetic poles to an outer circumferential surface of a cylindrical bush;
and
a shaft having a first end and a second end, said shaft being disposed such that said second end thereof projects outward from said exterior casing at a position of said motor central axis;
a housing linked to said second end of said exterior casing relative to said motor central axis, said housing accommodating a projecting portion of said shaft;
a power conversion mechanism for converting torque acting around said motor central axis of said rotor into a motive force in a direction along said motor central axis;
and
an operating member disposed outside said housing in said direction along said motor central axis, said operating member being moved in said direction along said motor central axis by said motive force in said direction along said motor central axis to operate said transmission control valve,
wherein said magnets are prepared using rare-earth magnets.

10 more elements

An actuator for operating a transmission control valve of an automatic transmission apparatus, said actuator comprising:

a stepping motor comprising:
an exterior casing having a first end and a second end relative to a motor central axis;
a motor main body composed of:
a stator disposed inside said exterior casing;
and
a rotor rotatably disposed inside said stator around said motor central axis, said rotor being constructed by mounting magnets constituting magnetic poles to an outer circumferential surface of a cylindrical bush, and an internal thread portion being formed on an inner peripheral wall surface of said bush;
and
a shaft having a first end and a second end, said shaft being disposed such that said second end thereof projects outward from said exterior casing at a position of said motor central axis by screwing an external thread portion formed on said first end of said shaft into said internal thread portion of said bush;
a housing linked to said second end of said exterior casing relative to said motor central axis, said second end of said shaft projecting outward from said housing along said direction of said motor central axis;
a power conversion mechanism for converting torque acting around said motor central axis of said rotor into a motive force in a direction along said motor central axis by regulating rotation of said shaft so as to move said shaft in said direction along said motor central axis;
and
an operating member mounted to a second end portion of said shaft projecting outward from said housing, said operating member being moved in said direction along said motor central axis to operate said transmission control valve,
wherein a penetrating aperture is disposed through said first end of said exterior casing relative to said direction of said motor central axis so as to communicate between an interior portion of said bush and an exterior portion of said exterior casing, and a filter is disposed so as to cover said penetrating aperture from said second end of said exterior casing relative to said direction of said motor central axis.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/679,375Filed 7 Oct 2003
Priority: JP 2002-29847411 Oct 2002
Published: 15 Apr 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F16K 31/047
Using a motor: characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or…
F16H 61/0251
The signals being electric: elements specially adapted for electric control units, e.g. valves for converting electrical signals to fluid signals
H02K 7/06
Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical…:…
F16H 63/065
The final output mechanism having an indefinite number of positions: hydraulic actuating means