IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0508346
(2003-03-24)
|
우선권정보 |
JP-20020-081722(2002-03-22) |
국제출원번호 |
PCT/JP03/003489
(2003-03-24)
|
§371/§102 date |
20040920
(20040920)
|
국제공개번호 |
WO03/080407
(2003-10-02)
|
발명자
/ 주소 |
- Okuno,Masanari
- Funayama,Tomoyuki
- Asahi,Toshio
- Kakegawa,Tomoo
|
출원인 / 주소 |
- Kabushiki Kaisha Tokai Rika Denki Seisakusho
|
대리인 / 주소 |
Patterson, Thuente Skaar &
|
인용정보 |
피인용 횟수 :
12 인용 특허 :
10 |
초록
▼
An electric steering lock device which can prevent a motor from being overloaded and can increase the drive force of the motor. The electric steering lock device of the present invention has a lock bar which moves according to the movement of a cam follower. The cam follower relatively moves in a sp
An electric steering lock device which can prevent a motor from being overloaded and can increase the drive force of the motor. The electric steering lock device of the present invention has a lock bar which moves according to the movement of a cam follower. The cam follower relatively moves in a spiral cam groove in accordance with the rotation of a rotary plate driven by an electric motor, thereby the cam follower moves along the radial direction of the rotary plate. The cam follower can be disengaged from the cam groove via the end portions of the cam groove according to the rotation of the rotary plate. When the cam follower is disengaged from the cam groove, the rotation of the rotary plate is permitted.
대표청구항
▼
The invention claimed is: 1. An electric steering lock device for selectively locking a movable member which moves in response to a steering wheel, the device comprising: a motor; a rotary body which is selectively rotated in a first direction and a second direction opposite to the first direction
The invention claimed is: 1. An electric steering lock device for selectively locking a movable member which moves in response to a steering wheel, the device comprising: a motor; a rotary body which is selectively rotated in a first direction and a second direction opposite to the first direction and has a cam groove spirally extending around the central axis of said rotary body, wherein said cam groove includes an inside end portion provided radially inward in said rotary body and an outside end portion provided radially outward in said rotary body; a cam follower which moves along the radial direction of said rotary body when the location of said cam groove engaged with said cam follower shifts as said rotary body rotates with said cam follower engaged with said cam groove, wherein said cam follower moves in a direction toward the central axis of said rotary body when said rotary body rotates in the first direction, and said cam follower moves in a direction away from the central axis of said rotary body when said rotary body rotates in the second direction; a lock member which is coupled to said cam follower, moves between a position where it is engaged with said movable member to lock said movable member and a position where it is disengaged from said movable member to unlock said movable member in accordance with movement of said cam follower; wherein as said rotary body rotates in said first direction, said inside end portion of said cam groove permits said cam follower to be disengaged from said cam groove, and as said rotary body rotates in said second direction, said outside end portion of said cam groove permits said cam follower to be disengaged from said cam groove, thereby permitting rotation of said rotary body with said cam follower disengaged from said cam groove. 2. The device according to claim 1, wherein as said rotary body rotates in said second direction, said cam groove permits said cam follower, disengaged from said cam groove, to enter into said cam groove. 3. The device according to claim 1, wherein said cam groove includes a bottom surface and said rotary body includes a surface orthogonal to the axis of said rotary body, and the bottom surface of said cam groove is slanted with respect to the surface orthogonal to the axis of said rotary body so that the depth of the cam groove becomes smaller as it comes closer to said inside end portion. 4. The device according to claim 1, wherein said rotary body has a peripheral surface coaxial with said rotary body which permits said cam follower disengaged from said cam groove via said inside end portion to slide on said peripheral surface, wherein the distance between said cam follower when sliding on the peripheral surface, and central axis of said rotary body, is equal to the distance between said cam follower when located at said inside end portion of said cam groove and the central axis of said rotary body. 5. The device according to claim 1 wherein as said rotary body rotates in said first direction, said cam groove permits said cam follower, when disengaged from said cam groove, to enter into said cam groove. 6. The device according to claim 1, wherein said rotary body has a protrusion spirally extending around the central axis of said rotary body, said protrusion including two parts that are adjacent to each other in the radial direction of the rotary body, and said cam groove is formed by a gap between said two parts. 7. The device according to claim 6, wherein said cam follower, when disengaged from said cam groove via said outside end portion, slides on the outside surface of the part of said protrusion positioned outermost in the radial direction of said rotary body. 8. The device according to claim 1, further comprising an urging member which urges said cam follower toward the bottom surface of said cam groove. 9. The device according to claim 1, further comprising an urging member which urges said cam follower toward the central axis of said rotary body. 10. The device according to claim 2, wherein said cam groove includes a bottom surface and said rotary body includes a surface orthogonal to the axis of said rotary body, and the bottom surface of said cam groove is slanted with respect to the surface orthogonal to the axis of said rotary body so that the depth of the cam groove becomes smaller as it comes closer to said inside end portion. 11. The device according to claim 2, wherein said rotary body has a peripheral surface coaxial with said rotary body which permits said cam follower disengaged from said cam groove via said inside end portion to slide on said peripheral surface, wherein the distance between said cam follower when sliding on the peripheral surface, and central axis of said rotary body, is equal to the distance between said cam follower when located at said inside end portion of said cam groove and the central axis of said rotary body. 12. The device according to claim 3, wherein said rotary body has a peripheral surface coaxial with said rotary body which permits said cam follower disengaged from said cam groove via said inside end portion to slide on said peripheral surface, wherein the distance between said cam follower when sliding on the peripheral surface, and central axis of said rotary body, is equal to the distance between said cam follower when located at said inside end portion of said cam groove and the central axis of said rotary body. 13. The device according to claim 2, wherein as said rotary body rotates in said first direction, said outside end portion of said cam groove permits said cam follower, when disengaged from said cam groove, to enter into said cam groove. 14. The device according to claim 3, wherein as said rotary body rotates in said first direction, said cam groove permits said cam follower, when disengaged from said cam groove, to enter into said cam groove. 15. The device according to claim 4, wherein as said rotary body rotates in said first direction, said cam groove permits said cam follower, when disengaged from said cam groove, to enter into said cam groove. 16. The device according to claim 2, wherein said rotary body has a protrusion spirally extending around the central axis of said rotary body, said protrusion including two parts that are adjacent to each other in the radial direction of the rotary body, and said cam groove is formed by a gap between said two parts. 17. The device according to claim 3, wherein said rotary body has a protrusion spirally extending around the central axis of said rotary body, said protrusion including two parts that are adjacent to each other in the radial direction of the rotary body, and said cam groove is formed by a gap between said two parts. 18. The device according to claim 4, wherein said rotary body has a protrusion spirally extending around the central axis of said rotary body, said protrusion including two parts that are adjacent to each other in the radial direction of the rotary body, and said cam groove is formed by a gap between said two parts. 19. The device according to claim 5, wherein said rotary body has a protrusion spirally extending around the central axis of said rotary body, said protrusion including two parts that are adjacent to each other in the radial direction of the rotary body, and said cam groove is formed by a gap between said two parts. 20. The device according to claim 2, further comprising an urging member which urges said cam follower toward the bottom surface of said cam groove.
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