CN-117795188-B - Support structure for fuel injection valve

Abstract

In the supporting structure of the fuel injection valve (I), a fastening protrusion (21) which is fastened and fastened with the outer peripheral surface of the fuel introduction cylinder part (4) accommodated in the notch (19) is formed on the inner side surface of the notch (19) of the base plate (15). In a state where the fuel injection valve (I) is mounted on the engine (E), the contact friction force of the elastic piece (16) relative to the base plate (15) is increased due to the increase of the deflection resilience force of the elastic piece (16), so that the clamping force of the clamping protrusion (21) relative to the fuel introduction cylinder part (4) is automatically increased.

Inventors

• Gang Benchun
• Fukunaga Koya
• NODA KAZUYOSHI
• Haruki Takumi

Assignees

• 日立安斯泰莫株式会社

Dates

Publication Date

20260512

Application Date

20221017

Priority Date

20211019

Claims (3)

1. 1. A support structure for a fuel injection valve, comprising a cylindrical valve housing (1) at the center of a fuel injection valve (I), a solenoid portion (3) provided at the middle of the valve housing (1), The electromagnetic coil part (3) is covered by a synthetic resin molding part (6), A coupler (14) for supplying power to the electromagnetic coil part (3) is integrally protruded on one side of the synthetic resin molding part (6), The fuel nozzle tube part (2) of the valve housing (1) is embedded in an injection valve mounting hole (10) of the engine (E), A fuel supply cap (Da) of a fuel distribution pipe (D) supported by an engine (E) is fitted to a fuel introduction tube portion (4) of the valve housing (1), An elastic support member (S) for urging the valve housing (1) toward the injection valve mounting hole (10) is interposed between the valve housing (1) and the fuel supply cap (Da), The elastic support member (S) is composed of: A base plate (15) having a U-shaped cutout (19) for accommodating the outer periphery of the fuel introduction tube (4), facing the fuel supply cap (Da), and overlapping a flat base surface (5) provided on the rear end surface of the synthetic resin molding part (6) facing the fuel introduction tube (4), and An elastic piece (16) extending from one end of the base plate (15) opposite to the notch (19) and elastically contacting the middle part with the fuel supply cover and elastically contacting the end part with the base plate (15), The synthetic resin molding part (6) has a rotation stopping protrusion (20) protruding from a transition portion which spans between the coupler (14) and the fuel introduction tube part (4) as an extension plane extending from the base surface (5), The elastic support member (S) has a structure in which a pair of engagement protrusions (21) that engage with the outer peripheral surface of the fuel introduction tube (4) accommodated in the notch (19) are formed on both inner surfaces of the notch (19) of the base plate (15), the rotation-stopping protrusions (20) engage between the notch (19) and the distal end portions (16 ba) of the pair of elastic pieces (16) while the engagement is performed, In a state where the fuel injection valve (I) is mounted on the engine (E), as the deflection repulsive force of the elastic piece (16) increases, the contact friction force of the elastic piece (16) against the base plate (15) increases, and the engagement force of the engagement protrusion (21) against the fuel introduction tube (4) increases.
2. 2. The support structure of a fuel injection valve according to claim 1, wherein, A first notch (23) is provided in the middle of the two outer side surfaces of the base plate (15).
3. 3. The support structure of a fuel injection valve according to claim 1 or 2, characterized in that, A second cutout (24) is provided on the base plate (15) adjacent to the root of the elastic piece (16).

Description

Support structure for fuel injection valve Technical Field The present invention relates to a support structure for a fuel injection valve used in an engine, and more particularly, to an improvement in a support structure for a fuel injection valve in which a fuel nozzle tube portion of a valve housing is fitted into an injection valve mounting hole of an engine, a fuel supply cap of a fuel delivery tube supported by the engine is fitted into a fuel introduction tube portion of the valve housing, and an elastic support member for biasing the valve housing toward the injection valve mounting hole is interposed between the valve housing and the fuel supply cap, whereby the fuel injection valve is elastically sandwiched between the engine and the fuel supply cap to prevent axial movement thereof. Background Such a support structure of a fuel injection valve is known as disclosed in patent document 1 below. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2013-174227 Patent document 2 Japanese patent laid-open No. 2002-516957 Disclosure of Invention Problems to be solved by the invention After the fuel injection valve is manufactured, the elastic support member is mounted in advance at a fixed position of the fuel injection valve when the fuel injection valve is transported to an assembly line of an engine, but the elastic support member must not be detached or deviated from the fuel injection valve during the transportation. In order to prevent such a drop and misalignment, in the support structure of the fuel injection valve described in patent document 1, a pair of holding pieces extending from one end of the elastic support member to the fuel nozzle tube portion side in a curved manner are continuously provided on the base plate of the elastic support member, and both flat side surfaces of the valve housing are elastically held by the holding pieces. In this support structure, although the elastic support member can be easily attached to the fuel injection valve, the continuous provision of the pair of clamping pieces on the base plate has the disadvantage of complicating the structure of the elastic support member, increasing the number of processing steps, and reducing the yield of raw materials, leading to an increase in the cost of the support structure. On the other hand, in the support structure of the fuel injection valve described in patent document 2, the elastic support member is attached to the fuel injection valve by the click engagement structure, but when the engagement force of the click engagement structure is sufficiently enhanced, the attachment property is deteriorated. Therefore, if the engagement force is set to be weak in consideration of the mountability thereof, the elastic support member may be separated from the fuel injection valve due to vibration of the engine in a state where the fuel injection valve is mounted to the engine. The present invention has been made in view of the above circumstances, and an object thereof is to provide a support structure for a fuel injection valve that employs a snap-engagement structure for simplifying the structure of an elastic support member and improving the mountability of the elastic support member to the fuel injection valve, and that can automatically enhance a snap-engagement force in a state where the fuel injection valve is mounted to an engine, thereby preventing the elastic support member from being separated from the fuel injection valve. Means for solving the problems The first feature of the present invention is that a fuel injection valve support structure is provided, in which a fuel nozzle tube portion of a valve housing is fitted into an injection valve mounting hole of an engine, a fuel supply cap of a fuel delivery tube supported by the engine is fitted into a fuel introduction tube portion of the valve housing, an elastic support member for urging the valve housing toward the injection valve mounting hole is interposed between the valve housing and the fuel supply cap, the elastic support member comprises a base plate having a U-shaped notch for accommodating an outer periphery of the fuel introduction tube portion and overlapping a base surface of the valve housing facing the fuel supply cap, and an elastic piece extending from one end of the base plate and elastically contacting an intermediate portion with the fuel supply cap, and elastically contacting an end portion with the base plate, wherein a snap-in protrusion for snap-in engagement with an outer peripheral surface of the fuel introduction tube portion accommodated in the notch is formed on an inner side surface of the notch, and the snap-in engagement protrusion increases frictional force against the fuel introduction tube portion with respect to the base plate as a resilient force of the elastic piece increases in a state in which the fuel injection valve is mounted to the engine. In addition to the first feature