IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0887709
(2006-03-28)
|
등록번호 |
US-7552706
(2009-07-09)
|
국제출원번호 |
PCT/US06/011223
(2006-03-28)
|
§371/§102 date |
20071002
(20071002)
|
국제공개번호 |
WO06/110317
(2006-10-19)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
Wegman, Hessler & Vanderburg
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
17 |
초록
▼
An automatic decompression mechanism for selectively actuating a cylinder valve of an engine so as to reduce the starting force required to start the engine. The mechanism includes a cam gear, a centrifugal member, and a cover member comprising an integrally formed biasing means for biasing and reta
An automatic decompression mechanism for selectively actuating a cylinder valve of an engine so as to reduce the starting force required to start the engine. The mechanism includes a cam gear, a centrifugal member, and a cover member comprising an integrally formed biasing means for biasing and retaining the centrifugal member in the cam gear. The biasing means urges the centrifugal member into a decompression position when the cam gear is rotating at a lower speed, wherein a projecting portion of the centrifugal member actuates the valve mechanism to reduce the starting force required to start the engine. During normal engine operation, the centrifugal member pivots into a non-decompression position wherein the projecting portion of the centrifugal member recedes below the cam profile surface so as to prevent the projecting portion from actuating the valve mechanism.
대표청구항
▼
What is claimed is: 1. An automatic decompression mechanism for selectively actuating a valve mechanism of an engine to reduce the compression pressure in a combustion chamber while starting the engine, said decompression mechanism comprising: a cam gear having a first side and a second side, said
What is claimed is: 1. An automatic decompression mechanism for selectively actuating a valve mechanism of an engine to reduce the compression pressure in a combustion chamber while starting the engine, said decompression mechanism comprising: a cam gear having a first side and a second side, said first side defining a cam profile surface for driving said valve mechanism, said second side having a slot region disposed therein, said slot region having an opening communicating with said cam profile surface; a centrifugal member disposed on the second side of the cam gear, said centrifugal member having a projecting portion, a pivot portion and a weight portion, said pivot and projecting portion being pivotally received within said slot region; a cover member mounted to said second side of said cam gear; a biasing means integrally formed from a portion of said cover member, said biasing means adapted to urge said centrifugal member into a decompression position when said cam gear is rotating at a lower speed, wherein under the action of a lower centrifugal force, said weight portion is positioned proximate an inner portion of said cam gear causing said projecting portion to project through said opening and above said cam profile surface, thereby causing said projecting portion to temporarily actuate said valve mechanism; and wherein said centrifugal member pivots to a non-decompression position when said cam gear is rotating at a higher speed, wherein under the action of a higher centrifugal force said weight portion is positioned proximate an outer portion of said cam gear causing said projecting portion to recede below said cam profile surface, thereby preventing said projecting portion from actuating said valve mechanism. 2. The decompression mechanism as recited in claim 1, wherein said slot region is disposed in a recessed groove on said second side of the cam gear, and said centrifugal member is disposed at least partially in said recessed groove. 3. The decompression mechanism as recited in claim 2, wherein said biasing means urges said centrifugal member into a decompression position when said cam gear is rotating at a lower speed such that said weight portion is positioned proximate an inner radius or said recessed grove so that said projecting portion projects through said opening and above said cam profile surface, and wherein said centrifugal member pivots to a non-decompression position when said cam gear is rotating at a higher speed such that said weight portion is positioned proximate an outer radius of said recessed groove so that said projecting portion recedes below said cam profile surface. 4. The decompression mechanism as recited in claim 3, wherein said cover member is formed of spring steel, and said integrated biasing means is formed in the shape of a leaf-type spring. 5. The decompression mechanism as recited in claim 4, wherein said integrated biasing means is formed from a peripheral portion of said cover member. 6. The decompression mechanism as recited in claim 1, wherein said second side of said cam gear further includes at least one boss member, wherein said cover member further includes at least one aperture, said aperture being adapted to receive said at least one boss member, and wherein said aperture includes at least one tab portion for creating an interference fit between said at least one aperture and said at least one boss member so as to retain said cover member on said second side of said cam gear. 7. The decompression mechanism as recited in claim 1, wherein said valve mechanism is an exhaust valve mechanism and said engine is an internal combustion engine. 8. The decompression mechanism as recited in claim 1, wherein said biasing means engages a back portion of said weight portion. 9. The decompression mechanism as recited in claim 1, wherein an angular distance between said decompression and non-decompression positions is less than about 90 degrees. 10. A method of assembling an automatic decompression mechanism for selectively actuating a valve mechanism of an engine, said method comprising the steps of: (a) providing a cam gear having a first side and a second side, said first side defining a cam profile surface for driving said valve mechanism, said second side comprising a recessed groove with a slot region disposed therein, said slot region having an opening communicating with said cam profile surface; (b) providing a centrifugal member having a projecting portion, a pivot portion and a weight portion; (c) providing a cover member with an integrally formed biasing means; (d) inserting said pivot portion and said projecting portion into said slot region so that said weight portion of said centrifugal member is located proximate an inner radius of said recessed groove; (e) mounting said cover member to said second side of said cam gear; (f) positioning said biasing means so that a tension end of said biasing means is proximate a back surface of said weight portion, thereby urging said centrifugal member into a decompression position wherein said projecting portion projects through said opening and above said cam profile surface; (g) rotating said cam gear at a lower speed, wherein under the action of a lower centrifugal force, said biasing means maintains said centrifugal member in said decompression position, wherein said projecting portion projects through said opening and above said cam profile surface, thereby causing said projecting portion to temporarily actuate said valve mechanism; and (h) rotating said cam gear at a higher speed, wherein under the action of a higher centrifugal force, said biasing means allows said centrifugal member to pivot into a non-decompression position, wherein said projecting portion recedes below said cam profile surface, thereby preventing said projecting portion from actuating said valve mechanism. 11. The method as recited in claim 10, wherein said second side further includes at least one boss member, and wherein said cover member includes at least one aperture for receiving said at least one boss member, said aperture comprising at least one tab portion for creating an interference fit between said at least one aperture and said at least one boss member, and wherein said mounting step (e) further includes the step of inserting said at least one boss member through said at least one aperture so that said at least one tab portion retains said cover member on said second side of said cam gear. 12. The method as recited in claim 11, wherein said cover member is formed of spring steel and said integrated biasing means is a leaf-type spring. 13. The method as recited in claim 12, wherein said integrated biasing means is formed from a peripheral portion of said cover member. 14. The method as recited in claim 13, wherein said valve mechanism is an exhaust valve mechanism and said engine is an internal combustion engine. 15. The method as recited in claim 14, wherein said biasing means engages a back portion of said weight portion. 16. The method as recited in claim 15, wherein an angular distance between said decompression and non-decompression positions is less than about 90 degrees.
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