IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0727788
(2000-12-04)
|
우선권정보 |
JP-0345377 (1999-12-03) |
발명자
/ 주소 |
- Taniguchi, Ikuhiro
- Kawabe, Taketoshi
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
9 |
초록
▼
A control system for an electromagnetic actuator actuates an intake or exhaust valve. The actuator includes first and second electromagnets which develop an electromagnetic attraction force the strengths of which depend on the amount of current supplied thereto. A spring biases an armature between t
A control system for an electromagnetic actuator actuates an intake or exhaust valve. The actuator includes first and second electromagnets which develop an electromagnetic attraction force the strengths of which depend on the amount of current supplied thereto. A spring biases an armature between the electromagnets to a neutral position therebetween. The control system comprises a control circuit which (a) controls the amount of current supplied to the first electromagnet thereby restricting a moving velocity of the armature, at a first stage in a course of changing the armature from a first position to a second position; and (b) supplies current to the second electromagnet at a timing at which the armature approaches the second electromagnet upon the biasing force of the spring thereby attracting the armature to the second position, at a second stage in the course of changing the armature from the first position to the second position.
대표청구항
▼
A control system for an electromagnetic actuator actuates an intake or exhaust valve. The actuator includes first and second electromagnets which develop an electromagnetic attraction force the strengths of which depend on the amount of current supplied thereto. A spring biases an armature between t
A control system for an electromagnetic actuator actuates an intake or exhaust valve. The actuator includes first and second electromagnets which develop an electromagnetic attraction force the strengths of which depend on the amount of current supplied thereto. A spring biases an armature between the electromagnets to a neutral position therebetween. The control system comprises a control circuit which (a) controls the amount of current supplied to the first electromagnet thereby restricting a moving velocity of the armature, at a first stage in a course of changing the armature from a first position to a second position; and (b) supplies current to the second electromagnet at a timing at which the armature approaches the second electromagnet upon the biasing force of the spring thereby attracting the armature to the second position, at a second stage in the course of changing the armature from the first position to the second position. 5. The steering system as recited in claim 1, wherein said steered mechanism is one of a steered wheel of a wheeled vehicle and a rudder of a marine vessel. 6. A steering system as recited in claim 1, wherein both of said first and second speed change ratios are different from a 1:1 ratio. 7. A steering system as recited in claim 1, wherein all components transferring torque from said input element to said output element remain axially stationary during shifting. 8. A steering system comprising: (A) a manually operated steering mechanism; (B) a steered mechanism; and (C) a steering transmission coupling said steering mechanism to said steered mechanism, said steering transmission including (1) a multi-ratio speed changer having an input element that is coupled to said steering mechanism, an output element that transmits steering forces to said steered mechanism, and a shifter that is movable between at least first and second shifted positions to vary a speed change ratio of said speed changer between at least first and second distinct change ratios; and (2) a torque gate coupling said output element of said speed changer to said steered mechanism so as to permit steering forces to be transmitted to said steered mechanism from said speed changer while preventing backdrive forces from being transmitted to said speed changer from said steered mechanism, wherein said speed changer includes an input shaft coupled to said steering mechanism and forming said input element of said speed changer; a first planetary gear set comprising a first sun gear mounted on said input shaft, a first ring gear, and a first plurality of planet gears disposed between said first ring gear and said first sun gear; a second planetary gear set comprising a second sun gear mounted on said input shaft, a second ring gear, and a second plurality of planet gears disposed between said second ring gear and said second sun gear, wherein said first and second sun gears are of first and second different diameters; and a common carrier for all of said planet gears, said carrier being coupled to an input element of said torque gate and forming at least part of said output element of said speed changer; wherein movement of said shifter between said first and second shifted positions selectively arrests one of said first and second ring gears from rotation to select the associated planetary gear set for torque transfer to said driven pin from said input shaft. 9. A steering system comprising: (A) a manually operated steering mechanism; (B) a steered mechanism; and (C) a steering transmission coupling said steering mechanism to said steered mechanism, said steering transmission including (1) a multi-ratio speed changer having an input element that is coupled to said steering mechanism, an output element that transmits steering forces to said steered mechanism, and a shifter that is movable between at least first and second shifted positions to vary a speed change ratio of said speed changer between at least first and second distinct change ratios; and (2) a torque gate coupling said output element of said speed changer to said steered mechanism so as to permit steering forces to be transmitted to said steered mechanism from said speed changer while preventing backdrive forces from being transmitted to said speed changer from said steered mechanism, wherein said torque gate comprises (A) a stationary surface; (B) a release driver that is coupled to said output element of said speed changer and that is rotatable relative to said stationary surface; (C) a locking driver that is coupled to said steered mechanism and that is rotatable relative to said stationary surface, wherein said release driver and said locking driver have axially-extending drive surfaces that face one another with a circumferential gap therebetween; and (D) a wrapped spring that has at least one coil that is disposed adjacent said stationary surface, wherein said spring , said release driver, said locking driver, and said stationary surface are dimensioned and configured relative to one another such that, (1) upon rotation of said release driver in either direction under torsional forces imposed on said torque gate by said speed changer, said spring rotates relative to said stationary surface so as permit rotation of said release driver and said locking driver, thereby permitting torque transfer to said steered mechanism from said output element of said speed changer, and (2), in the absence of the imposition of an overpowering steering forces on said release driver from said speed changer, and upon rotation of said locking driver in either direction under torsional forces imposed on said torque gate by said steered mechanism, said spring locks against said stationary surface so as prevent said drive surface of said locking driver from driving said release driver to rotate, thereby preventing torque transfer to said speed changer from said steered mechanism. 10. The steering system as recited in claim 9, wherein said wrapped spring has (1) first and driver engagement structures, each of which is positioned between the drive surfaces of said release driver and said locking driver, and (2) at least one coil that is disposed adjacent said stationary surface, wherein said release and locking drivers engage said driver engagement structures upon rotation thereof relative to said stationary surface, and wherein said coil engages said stationary surface to lock said spring against said stationary surface when said locking driver engages one of said structures in the absence of an overpowering steering force on said spring from said release driver. 11. The steering system as recited in claim 9, wherein said stationary surface comprises an inner peripheral surface of a housing for said torque gate, and wherein said spring locks against said inner peripheral surface of said housing when said locking driver rotates against one of said driver engagement structures in the absence of the imposition of an overpowering steering force on one of said driver engagement structures by said release driver. 12. An outboard motor steering system comprising: (A) a speed changer including (1) an input shaft configured for rotational coupling to a steering wheel of a boat, (2) at least one output element, (3) at least one planetary gear set including a sun gear mounted on said input shaft, a ring gear, and a plurality of planet gears disposed between said sun gear and said ring gear, and (4) a shifter that is manually movable into a shifted position thereof to selectively arrest a component of said planetary gear set from rotation to alter a speed change ratio of said speed changer; and (B) a torque gate including (1) a housing having an inner peripheral surface, (2) a release driver that is located within said housing, that is coupled to said output element of said speed changer, and that is rotatable relative to said housing, (3) a locking driver that is located within said housing, that is configured for rotational coupling to a steered mechanism for a rudder of the boat, and that is rotatable relative to said housing, wherein said release driver and said locking driver have axially-extending drive surfaces that face one another with a circumferential gap therebetween, and (4) a wrapped spring that is located within said housing and that is engageable by both said release driver and said locking driver, wherein said spring, said release driver, said locking driver, and said housing are dimensioned and configured relative to one another such that, (1) upon rotation of said release driver in either direction under torsional forces imposed on said torque gate by said speed changer, said spring rotates relative to said housing so as permit said rotation of said release driver and said locking driver, thereby permitting torque transfer to the steered mechanism from said output element of said speed chang
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