[미국특허]
High pressure fuel injection tube and method of forming the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
공개
국제특허분류(IPC7판)
F16L-011/00
F16L-025/00
F02M-055/02
출원번호
US-0217866
(2005-09-01)
공개번호
US-0042710
(2006-03-02)
우선권정보
JP-2004-256052(2004-09-02)
발명자
/ 주소
Furugen,Munekatsu
출원인 / 주소
Usui Kokusai Sangyo Kaisha Limited
인용정보
피인용 횟수 :
0인용 특허 :
0
초록▼
A high pressure fuel injection tube includes a connection head with a seat face in a spherical shape. A ring-like flange is spaced from the seat face in an axial direction. A conical portion is formed in the interval between the ring-like flange and the seat face. An undercut bent recess groove with
A high pressure fuel injection tube includes a connection head with a seat face in a spherical shape. A ring-like flange is spaced from the seat face in an axial direction. A conical portion is formed in the interval between the ring-like flange and the seat face. An undercut bent recess groove with a ring-like shape and a deep depth is formed on the conical portion. Thus, a shallow smooth ring-like recess groove is formed on an inner side of the connection head, and a compressive residual stress is present at an inner peripheral face of the ring-like groove.
대표청구항▼
What is claimed is: 1. A high pressure fuel injection tube which is a high pressure fuel injection tube comprising a connection head portion comprising a seat face in a spherical shape, a ring-like flange portion arranged to be formed to be spaced apart from the seat face at an interval therebetwee
What is claimed is: 1. A high pressure fuel injection tube which is a high pressure fuel injection tube comprising a connection head portion comprising a seat face in a spherical shape, a ring-like flange portion arranged to be formed to be spaced apart from the seat face at an interval therebetween in an axis core direction, and a conical portion conversingly formed in a direction of the seat face at the interval region reaching a position of the ring-like flange portion continuously from the seat face at a connection end portion of a thick-walled steel tube having a comparatively slender diameter, wherein by providing an undercut bent recess groove in a ring-like shape having a deep depth at a portion of the conical portion, a ring-like recess groove on an inner side of the head portion produced in accordance with forming the connection head portion is formed into a contour shape of a section which is provided with a shallow depth and is smooth and a compressive residual stress is made to be present on an inner peripheral face of the ring-like recess groove portion. 2. The high pressure fuel injection tube according to claim 1, wherein the undercut bent recess groove in the ring-like shape having the deep depth satisfies conditions that W/L=0.3 through 0.75, DA/d=0.95 through 1.3 and a minimum outer diameter of the bent recess groove becomes smaller than DA when an end edge on a side of the ring-like flange portion of the bent groove is defined as a point A1, an end edge on an opposed side of the ring-like flange portion is defined as a point A2, an outer diameter of the steel tube is designated by a notation d, an outer diameter of the point A2 is designated by a notation DA, a distance in parallel with a tube axis between the point A1 and the point A2 (a width of the bent recess groove) is designated by a notation W and a distance between an end face of the seat face in the spherical shape and the point A1 is designated by a notation L. 3. A method of forming a high pressure fuel injection tube comprising: forming, on a connection end portion of a thick-walled steel tube having a comparatively slender diameter, a seat face in a spherical shape, and a ring-like flange portion arranged to be formed to be spaced apart from the seat face at an interval therebetween in an axis core direction, and at the interval region reaching a position of the ring-like flange portion continuously from the seat face, a conical portion formed conversingly in a direction of the seat face, and then forming, on a portion of the conical portion, an undercut bent recess groove in a ring-like shape having a deep depth. 4. A method of forming a high pressure fuel injection tube by forming a seat face in a spherical shape, a ring-like flange portion arranged to be formed to be spaced apart from the seat face at an interval therebetween in an axis core direction, and a conical portion conversingly formed in a direction of the seat face at the interval region reaching a position of the ring-like flange portion continuously from the seat face at a connection end portion of a thick-walled steel tube having a comparatively slender diameter, by providing an undercut bent recess groove in a ring-like shape having a deep depth at a portion of the conical portion, a ring-like recess groove on an inner side of the head portion. 5. The method of forming a high pressure fuel injection tube according to claim 4, wherein as a method of forming the undercut bent recess groove in the ring-like shape having the deep depth at the portion of the conical portion, there is used a method of forming the ring-like bent recess groove by rolling by a roller or by swaging by a plurality of pressing pieces each having a bent projected face in a shape of a circular arc. 6. The method of forming a high pressure fuel injection tube according to claim 4, wherein as a method of forming the undercut bent recess groove in the ring-like shape having the deep depth at the portion of the conical portion, there is used a method of forming a bent projected streak in a ring-like shape at the portion of the conical portion in forming the conical portion, successively, forming the bent projected streak by rolling by a roller or swaging by a plurality of pressing pieces each having a bent projected face in a shape of a circular arc. 7. The method of forming a high pressure fuel injection tube according to claim 3, wherein as a method of forming the undercut bent recess groove in the ring-like shape having the deep depth at the portion of the conical portion, there is used a method of forming the ring-like bent recess groove by rolling by a roller or by swaging by a plurality of pressing pieces each having a bent projected face in a shape of a circular arc. 8. The method of forming a high pressure fuel injection tube according to claim 3, wherein as a method of forming the undercut bent recess groove in the ring-like shape having the deep depth at the portion of the conical portion, there is used a method of forming a bent projected streak in a ring-like shape at the portion of the conical portion in forming the conical portion, successively, forming the bent projected streak by rolling by a roller or swaging by a plurality of pressing pieces each having a bent projected face in a shape of a circular arc.
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