Attachment structure of fuel injection device nozzle plate

Patent metadata

Field	Value
Publication number	US-2016245250-A1
Application number	US-201415025718-A
Country	US
Kind code	A1
Filing date	Sep 19, 2014
Priority date	Oct 1, 2013
Publication date	Aug 25, 2016
Grant date	—

Abstract

An engaging projection of a valve body engages with an interlocking groove of a nozzle plate and the nozzle plate is rotated relative to the valve body. The engaging projection moves in a lateral groove of the interlocking groove while elastically deforming an arm part (elastically deformable portion), and the engaging projection is accommodated in a recess (lock position in the interlocking groove) of the arm part. A bottom surface of the recess of the arm part is pushed against the engaging projection of the valve body by the elastic force of the arm part, and the engaging projection of the valve body is seated and fixed on the bottom surface of the recess of the arm part. Accordingly, the nozzle plate is fixed to the valve body while being retained via the engaging projection and the interlocking groove (interlocking means).

First claim

1 . An attachment structure of a fuel injection device nozzle plate having a nozzle hole for atomizing and injecting fuel flowing from a fuel injection port of a fuel injection device, wherein:
a metal valve body of the fuel injection device has a front end side to which the fuel injection device nozzle plate is attachable, the front end side being provided with the fuel injection port, the fuel injection device nozzle plate includes a cylindrical fitting part into which the front end side of the valve body is fitted and a bottom wall part formed so as to block one end side of the cylindrical fitting part, the bottom wall part abutting against a front end surface of the valve body and having the nozzle hole, the cylindrical fitting part and the bottom wall part are made of synthetic resin and formed integrally, and the cylindrical fitting part has an elastically deformable portion elastically deformable in a part of another end side, is fitted onto the front end side of the valve body until the bottom wall part abuts against the front end surface of the valve body, and is fixed to the valve body while being retained via interlocking means when the elastically deformable portion is elastically deformed by engaging with a part of the interlocking means.

2 . An attachment structure of a fuel injection device nozzle plate having a nozzle hole for atomizing and injecting fuel flowing from a fuel injection port of a fuel injection device, wherein:
a metal valve body of the fuel injection device has an outer periphery around which an engaging projection is formed and a front end side to which the fuel injection device nozzle plate is attachable, the front end side being provided with the fuel injection port, the fuel injection device nozzle plate includes a cylindrical fitting part into which the front end side of the valve body is fitted and a bottom wall part formed so as to block one end side of the cylindrical fitting part, the bottom wall part abutting against a front end surface of the valve body and having the nozzle hole, the cylindrical fitting part and the bottom wall part of the fuel injection device nozzle plate are made of synthetic resin and formed integrally, the cylindrical fitting part has an elastically deformable arm part between an opening end on another end side and the interlocking groove, the arm part being formed by an interlocking groove on the other end side, and when the valve body is relatively rotated in a state in which the engaging projection engages with the interlocking groove and the bottom wall part is in contact with the front end surface of the valve body since the front end side of the valve body is fitted into the cylindrical fitting part, then the engaging projection is seated in a lock position in the interlocking groove and elastically deforms the arm part to generate an elastic force pushing the bottom wall part against the front end surface of the valve body on the arm part and fix the cylindrical fitting part to the valve body while being retained via the engaging projection and the interlocking groove.

3 . The attachment structure of a fuel injection device nozzle plate according to claim 2 ,
wherein the interlocking groove includes an axial groove extending in a direction in which the valve body is fitted from the other end of the cylindrical fitting part and a lateral groove extending in a circumferential direction from an end part of the axial groove, the arm part is formed like a cantilever between the other end of the cylindrical fitting part and the lateral groove and a groove wall of the lateral groove is provided with a recess for accommodating the engaging projection, and the engaging projection moves in the axial groove when the valve body is fitted into the cylindrical fitting part, moves in the lateral groove while bending the arm part when the cylindrical fitting part is rotated relative to the valve body, is seated on an inner surface of the recess as the lock position so as to be pushed against the inner surface of the recess by an elastic force of the arm part, and is fixed to the recess.

4 . The attachment structure of a fuel injection device nozzle plate according to claim 3 ,
wherein a part of the groove wall forming the lateral groove, the part being close to the arm part and extending from a vicinity of the recess to the axial groove, is an inclined plane approaching the other end of the cylindrical fitting part from the vicinity of the recess to the axial groove so as to smoothly guide the engaging projection from the axial groove to the recess.

5 . The attachment structure of a fuel injection device nozzle plate according to claim 4 ,
wherein the inclined plane is smoothly connected to the axial groove by a curved surface.

6 . The attachment structure of a fuel injection device nozzle plate according to claim 3 ,
wherein, when an edge of the recess close to the axial groove is assumed to be a front recess edge and an edge of the recess away from the axial groove is assumed to be a rear recess edge, a rotation preventing projection connected to the rear recess edge and projecting inside the lateral groove is formed in a part of the groove wall forming the lateral groove, the part being close to the arm part.

7 . The attachment structure of a fuel injection device nozzle plate according to claim 3 ,
wherein at least a front end side of the arm part is disposed radially inward of the cylindrical fitting part and at least the front end side is pushed against an outer peripheral surface of the valve body.

8 . An attachment structure of a fuel injection device nozzle plate having a nozzle hole for atomizing and injecting fuel flowing from a fuel injection port of a fuel injection device, wherein:
a metal valve body of the fuel injection device has an outer periphery around which an interlocking groove is formed and a front end side to which the fuel injection device nozzle plate is attachable, the front end side being provided with the fuel injection port, the fuel injection device nozzle plate includes a cylindrical fitting part into which the front end side of the valve body is fitted and a bottom wall part formed so as to block one end side of the cylindrical fitting part, the bottom wall part abutting against a front end surface of the valve body and having the nozzle hole, the cylindrical fitting part and the bottom wall part of the fuel injection device nozzle plate are made of synthetic resin and formed integrally, the cylindrical fitting part has an elastically deformable arm part on another end side and an engaging projection on an inner surface of the arm part, the engaging projection engaging with the interlocking groove, and when the valve body is relatively rotated in a state in which the engaging projection engages with the interlocking groove and the bottom wall part is in contact with the front end surface of the valve body since the front end side of the valve body is fitted into the cylindrical fitting part, then the engaging projection is seated in a lock position in the interlocking groove and elastically deforms the arm part to generate an elastic force pushing the bottom wall part against the front end surface of the valve body on the arm part and fix the cylindrical fitting part to the valve body while being retained via the engaging projection and the interlocking groove.

9 . The attachment structure of a fuel injection device nozzle plate according to claim 8 ,
wherein the interlocking groove is formed like a long hole extending substantially along a circumferential direction of an outer peripheral surface of the valve body, one end side in a longitudinal direction is disposed closer to the front end surface of the valve body than another e

Assignees

• Enplas Corp

Inventors

• Noguchi Koji

Classifications

• F02M61/166 Primary

  Selection of particular materials · CPC title

• F02M61/1853

  Orifice plates · CPC title

• F16B21/18

  with circlips or like resilient retaining devices, {i.e. resilient in the plane of the ring or the like}; Details (spring-washers for locking nuts F16B39/24; adjusting rings F16B43/00) · CPC title

• F02M61/168

  Assembling; Disassembling; Manufacturing; Adjusting · CPC title

• F02M2200/80

  Fuel injection apparatus manufacture, repair or assembly · CPC title