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1. 发明专利

DE4039520A1 未知
公开(公告)号：DE4039520A1
公开(公告)日：1991-07-04
申请号：DE4039520
申请日：1990-12-11
申请人： NIPPON DENSO CO
发明人： KATO MASAAKI , KANO HIROYUKI , OKAJIMA MASAHIRO , NARAHARA YOSHIHIRO , KOJIMA TERUTADA , TOJO SHIGEKI
IPC分类号： F02M61/10 , F02M61/16 , F02M61/18
摘要： A fuel injection valve of a diesel engine, comprising a valve body including a concave conical surface in the tip portion of the valve body, and fuel injection holes extending from the concave surface to the outside of the valve body, and a needle valve movable in the valve body and including a cylindrical shaft portion, a first conical surface adjacent to the shaft portion and having a conical angle smaller than that of the concave surface, the lower edge of the first conical surface defining a contact line separably contacting with the concave surface, a second conical surface adjacent to the first surface and having a conical angle substantially equal to that of the concave surface, a third conical surface adjacent to the second surface and having a conical angle greater than that of the concave surface. In case of a smaller lift amount of the needle valve, the fuel flow speed flowing into the fuel injection hole is fast and the atomized fuel injection divergence angle from the injection hole is great, thereby producing active producing mixing of the fuel with the air and enhancing the ignition feature, while in case of a greater lift amount, the fuel flow speed is slow and the atomized fuel injection divergence angle from the injection hole is small, thereby increasing the fuel flow reach and producing an active mixing of the fuel with the air by virtue of the kinetic energy of the atomized fuel flow.

2. 发明专利

JPH0417768A BAR FILTER FOR FUEL INJECTION VALVE 失效
公开(公告)号：JPH0417768A
公开(公告)日：1992-01-22
申请号：JP11626890
申请日：1990-05-02
申请人： NIPPON DENSO CO
发明人： NARAHARA YOSHIHIRO , KOJIMA TERUTADA
IPC分类号： F02M61/16
摘要： PURPOSE:To make an excessive fuel flow hardly occur, and reduce a fuel pressure loss by providing at least one end of a bar filter body with a sectional area reduction section gradually becoming smaller toward the end of a bar filter. CONSTITUTION:A fuel passage area cellularized with the internal surface of a fuel passage and the external surface of a bar filter body 16 is gradually reduced from an upstream side to a downstream side with a cross section reduction section 28 at the downstream end of a bar filter 15. The aforesaid area is also gradually enlarged from the upstream side to the downstream side with a cross section reduction section 29 at the downstream end of the bar filter 15. A fuel pressure loss can be reduced by gradually changing the cross sectional area of the fuel passage at the upstream and downstream sides of the bar filter 15. Also, a foreign material in fuel can be removed in a gap between the small bore section of the bar filter 15 and the inner surface of the fuel passage at the intermediate section of the bar filter 15.

3. 发明专利

JPH05223034A FUEL INJECTION VALVE 失效
公开(公告)号：JPH05223034A
公开(公告)日：1993-08-31
申请号：JP2805392
申请日：1992-02-14
申请人： NIPPON DENSO CO
发明人： NARAHARA YOSHIHIRO
IPC分类号： F02M61/10 , F02M61/16
摘要： PURPOSE:To provide a fuel injection valve capable of instantaneously stopping fuel, and effectively absorbing a shock load generated at this time. CONSTITUTION:In a needle nozzle 5 and a nozzle body 7 constituting a valve, a flange section 502 is provided on the needle nozzle 5, and a step section (regulation section) 704 is provided on the nozzle body 7. The distance between the flange section 502 and the step section 704 is set longer than the distance between a contact section 501 and the nozzle body 7 when the needle nozzle 5 is lifted and the valve seat 701 of the nozzle needle 7 is separated from the contact section 501. When fuel is stopped, the contact section 501 is brought into contact with the valve seat 701 and the flange section 502 is brought into contact with the step section 704 respectively by the elastic deformation of the needle nozzle 5 and the flange section 502, and a shock is absorbed at two positions.

4. 发明专利

JPH03182682A FUEL INJECTION VALVE 失效
公开(公告)号：JPH03182682A
公开(公告)日：1991-08-08
申请号：JP32165589
申请日：1989-12-12
申请人： NIPPON DENSO CO
发明人： KATO MASAAKI , KANO HIROYUKI , OKAJIMA MASAHIRO , KOJIMA TERUTADA , NARAHARA YOSHIHIRO , TOJO SHIGEKI
IPC分类号： F02M61/10 , F02M61/16 , F02M61/18
摘要： PURPOSE:To provide a fuel injection valve which is decreased in a sack volume and has excellent spray characteristics by constituting the fuel injection valve with a valve body having an injection nozzle extending from the interior of a conical surface to the exterior and a needle valve having a three-stage slope formed to the tip of a columnar shaft body. CONSTITUTION:A first slope 32 having an angle lower than an angle alpha2 of a conical surface 22 of a valve body 2, a second slope 33 having an angle slightly higher than that of the conical surface 22 with a boundary therebetween being an annular tangent 30 making contact with the conical surface 22, and a third slope 34 having an angle alpha1 higher than the angle alpha2 of the conical surface 22 are continuously formed to a needle valve 3. A plurality of inclination grooves 35 are formed in a columnar shaft 31 and the slope 32 of the needle valve 3, and fuel fed in a columnar hole 21 through the inclination groove 35 flows as it is revolved around the needle valve 3.

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