JP2017190753A5

JP2017190753A5 -

Info

Publication number: JP2017190753A5
Application number: JP2016081711A
Authority: JP
Filing date: 2016-04-15
Publication date: 2018-04-05
Anticipated expiration: 2036-04-15

Description

開示される発明のひとつは、燃料を噴射する噴孔（１１）および噴孔へ燃料を供給する供給流路（１２）が形成されたボデー（１０）と、供給流路を開閉する弁体（２０）と、を備える燃料噴射弁であって、
ボデーのうち供給流路を形成する流路壁面（１０ａ）の一部であって、弁体の中心軸線（２０ｃ）の周りに環状に延びる形状であり、開閉作動する弁体が離着座する着座面（１３）と、流路壁面の一部であって、着座面の下流側に連なり、弁体の外周面に対向し、中心軸線の周りに環状に延びる形状の着座下流面（１４）と、着座下流面に形成され、中心軸線から遠ざかる側へボデーを窪ませる形状のボデー側窪み部（１５）と、弁体の外周面に形成され、着座面に離着座するシート面（２１）と、弁体の外周面のうちシート面の下流側部分に形成され、中心軸線へ近づく側へ弁体を窪ませる形状、かつ、中心軸線の周りに環状に延びる形状の弁体側窪み部（２３）と、を備え、
噴孔の流入口（１１ａ）は着座下流面に位置し、ボデー側窪み部は、流入口のうち着座面に最も近い部分である流入口上流端（１１ａ１）、および流入口のうち着座面から最も遠い部分である流入口下流端（１１ａ３）を含む範囲で、中心軸線の周りに環状に延びる形状であり、弁体が閉弁状態で、弁体側窪み部の下流端（２３ｂ）は、ボデー側窪み部の下流端（１５ｂ）に対して、ボデー側窪み部の上流端（１５ａ）の反対側に位置する燃料噴射弁である。 One of the disclosed inventions is a body (10) in which a nozzle hole (11) for injecting fuel and a supply channel (12) for supplying fuel to the nozzle hole are formed, and a valve element (for opening and closing the supply channel). 20), a fuel injection valve comprising:
Part of the flow passage wall surface (10a) forming the supply flow passage in the body and having a shape extending annularly around the central axis (20c) of the valve body, and seating on which the valve body that opens and closes is seated A surface (13) and a seating downstream surface (14) that is a part of the channel wall surface, is connected to the downstream side of the seating surface, opposes the outer peripheral surface of the valve body, and extends annularly around the central axis A body-side recess (15) formed on the seating downstream surface and configured to recess the body away from the central axis, and a seat surface (21) formed on the outer peripheral surface of the valve body and seated on the seating surface. The valve-body-side depression (23) is formed in the downstream portion of the seat surface in the outer peripheral surface of the valve body, and has a shape in which the valve body is recessed toward the side approaching the central axis, and a shape that extends annularly around the central axis And comprising
The inflow port (11a) of the nozzle hole is located on the seating downstream surface, and the body-side depression is from the inflow port upstream end (11a1) that is the portion closest to the seating surface among the inflow ports and the seating surface of the inflow ports. in a range including the farthest portion in which the inlet downstream end (11a3), Ri shape der extending annularly around the central axis, the valve body is in a closed state, the downstream end of the valve body side recess (23b) is It is a fuel injection valve located on the opposite side of the upstream end (15a) of the body side depression with respect to the downstream end (15b) of the body side depression .

Claims

A body (10) having a nozzle hole (11) for injecting fuel and a supply channel (12) for supplying fuel to the nozzle hole, and a valve body (20) for opening and closing the supply channel are provided. A fuel injection valve,
The valve body that is a part of the wall surface (10a) of the body that forms the supply flow path and that extends annularly around the central axis (20c) of the valve body, and that opens and closes. A seating surface (13) for taking off and sitting;
A seating downstream surface (14) that is a part of the flow path wall surface, is connected to the downstream side of the seating surface, opposes the outer peripheral surface of the valve body, and extends annularly around the central axis;
A body-side recess (15) formed on the seating downstream surface and configured to recess the body toward the side away from the central axis;
A seat surface (21) formed on the outer peripheral surface of the valve body and seated on the seating surface;
A valve-body-side depression formed in the downstream portion of the seat surface in the outer peripheral surface of the valve-body and having a shape that allows the valve body to be recessed toward the side approaching the central axis, and a shape that extends annularly around the central axis Part (23);
With
The inlet (11a) of the nozzle hole is located on the seating downstream surface,
The body-side indented portion includes an inlet upstream end (11a1) that is the portion closest to the seating surface in the inlet, and an inlet downstream end (11a3) that is the portion farthest from the seating surface of the inlet. ) in a range including, Ri shape der extending annularly around said central axis,
When the valve body is closed, the downstream end (23b) of the valve body side recess is opposite to the upstream end (15a) of the body side recess with respect to the downstream end (15b) of the body side recess. Fuel injection valve located on the side .

A line where a plane including the center line (11c) of the nozzle hole and the central axis intersects with a surface connected to the inlet upstream end of the bottom surface of the body-side depression is referred to as a depression tangent (L2), and When the angle on the side close to the seating surface among the angles formed by the tangent to the depression and the center line is called the inflow angle (θ),
The fuel injection valve according to claim 1, wherein the inflow angle is an obtuse angle.

3. The fuel injection valve according to claim 1, wherein the inlet has a shape in which the diameter of the nozzle hole is gradually increased toward an upstream side of the nozzle hole. 4.

Said valve body is in a closed state, the upstream end of the valve body side recess portion (23a) is any one of claims 1 to 3 which is located upstream of the upstream end of the body-side recess portion (15a) The fuel injection valve as described.

The fuel injection valve according to any one of claims 1 to 4, wherein the valve body is in a closed state, and the downstream end (23b) of the valve body-side depression is located downstream of the inlet upstream end.

6. The fuel injection valve according to claim 5 , wherein the valve body is in a closed state, and the downstream end (23 b) of the valve body side recess is located on the opposite side of the inlet upstream end with respect to the inlet downstream end.