JPH068760U - Fuel injection valve - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the operating noise of fuel injection valves. [Structure] Pipe materials 30b, 30 constituting an armor chair
By the fuel injection valve having the valve body 30 configured to join the divided portions with the elastic body 30e interposed between c, when the valve body collides with the seat portion 3a and the stopper portion 9a of the valve body.
The elastic body 30e can absorb the impact generated at the time of the collision with. Therefore, the operating noise of the fuel injection valve due to the impact generated when the valve body is opened and closed can be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fuel injection valve for an internal combustion engine.

[0002]

[Prior art]

 In recent years, the noise level of the internal combustion engine has been reduced.Especially in the low rotation speed range and light load range such as during idle operation where the noise level is low, the fuel injection valve actuation The proportion of noise is increasing. Therefore, the operating noise of the fuel injection valve also accounts for a large proportion of the noise outside the vehicle.Therefore, it is inevitable to reduce the operating noise level of the fuel injection valve due to demands for environmental compatibility and product appeal. There is.

Therefore, in order to reduce the operating noise of the fuel injection valve, for example, there is a fuel injection valve disclosed in Japanese Utility Model Laid-Open No. 3-82874. An outline of such a conventional fuel injection valve will be described with reference to FIG. In FIG. 3, the fuel injection valve 1 has a nozzle body 3 that is connected to the tip of a nozzle body support cap 6 held at the tip of a resin housing 2 and is replaced by a needle valve that is normally made of solid material. The valve body 4 in which the bearing ball 4a and the armor chair 4b are joined to each other is slidably held by the spacer 7 around the outer periphery of the armature chair 4b.

The fuel injection valve 1 is fuel-sealed between an O-ring 10 installed in the fuel supply pipe 9 and a delivery pipe (not shown), and is attached to the insulator 11 and the tip of the housing 2 (not shown). It is inserted between the delivery pipe and the intake pipe via an insulator, and injects fuel into the intake pipe. In this structure, the armor chair 4b is made short and the valve body 4 is made lighter by using a pipe material for the armor chair 4b, so that the bearing ball 4a of the valve body 4 is seated on the seat portion 3a, and The noise generated at the time of collision between the upper end surface of the armature chair 4b and the stopper portion 9a is reduced. On the other hand, by making the housing 2 made of resin, the transmission of operating noise generated from the valve body is absorbed, and the noise is reduced.

Further, as another noise countermeasure for the fuel injection valve, a method of covering the entire fuel injection valve with a sound insulating cover or the like has been proposed.

[0006]

[Problems to be solved by the device]

 However, in order to further reduce the operating noise of the conventional fuel injection valve, it is necessary to reduce the weight of the valve body, which is effective in reducing the operating noise, but the conventional valve body is further shortened and thinned. It is difficult to reduce the weight by changing the material because of functional and structural problems.

On the other hand, the method of covering the entire fuel injection valve with a sound insulating cover or the like requires a large mounting space, and therefore cannot be applied to all internal combustion engines, resulting in an increase in weight and cost. There are also problems. The present invention has been made in view of the above conventional problems.To reduce the operating noise of the fuel injection valve, the present invention occurs when the valve body is seated on the seat portion and when the valve body collides with the stopper portion. It is an object of the present invention to provide a fuel injection valve having a structure capable of absorbing and absorbing the impact that occurs.

[0008]

[Means for Solving the Problems]

 For this reason, the fuel injection valve according to the present invention is configured to have a valve body having an elastic structure at an intermediate portion in the axial direction of the valve body.

[0009]

[Action]

 As a result, the impact generated when the valve body is seated on the seat portion and when the valve body collides with the stopper portion can be absorbed by the elastic structure portion, thus reducing the operating noise of the fuel injection valve. You can

[0010]

【Example】

 An embodiment according to the present invention will be described below with reference to the drawings. In the fuel injection valve 1 according to the first embodiment shown in FIG. 1A, the same parts as those in the conventional example shown in FIG. That is, the valve body 30 includes a bearing ball 30a, an armor chair including a pipe material 30b, a pipe material 30c, and a sleeve 30f, a fuel passage 30d, and an elastic body 30e. The bearing ball 30a and the pipe material 30b are joined together by, for example, welding or an adhesive, and the pipe material 30b and the pipe material 30c are joined together with an elastic body 30e (for example, synthetic resin) interposed. . A sleeve 30f is arranged on the outer peripheral side of the upper portion of the pipe material 30c so as to project from the upper end surface of the pipe material 30c, and is joined by, for example, welding, press fitting, or caulking. As a result, a recess is formed in the upper end of the pipe material 30c, and the spring 5 is embedded in the recess. A fuel passage 30d is formed in the pipe material 30b. As a joining method of the joining portion, for example, there is a method as shown in FIG. As shown in the figure, the end portions of the pipe members 30b and 30c on the side of the joint portion are circumferentially divided into several parts and bent outward to form joint reinforcement portions 31a and 32a. . Then, the elastic body 30e is installed so as to cover the joining strengthening portions 31a and 32a, and the pipe members 30b and 30c are joined. The joint is preferably located near the center of gravity of the valve in order to most effectively obtain the operation described below. Further, the elastic body 30e is arranged so as not to contact the spacer 7 when the valve body 30 is lifted and opened.

Then, as in the conventional example, the valve element 30 is slidably held by the spacer 7 and is biased in the valve closing direction by the spring 5, so that the bearing ball 30 a is seated on the seat portion 3 a of the nozzle body 3. It is seated and closed. Next, the operation will be described. When a predetermined voltage is applied to the electromagnetic coil 8 held inside the housing 2 and the fuel supply pipe 9 is magnetized, the fuel supply pipe 9 supplies the fuel to the sleeve 30f constituting the valve body 30. It is sucked in the direction of the pipe 9. The sleeve 30f slides along the spacer 7, and the valve element 30 lifts and opens until the end surface of the sleeve 30f on the fuel supply pipe 9 side contacts the stopper portion 9a of the fuel supply pipe 9, and the fuel injection hole is opened. The fuel is injected and supplied from 3b, and after the injection is completed, the valve body 30 again seats the bearing ball 30a on the seat portion 3a of the nozzle body 3 by the reaction force of the spring 5 to close the valve.

According to the configuration of the first embodiment, when the upper end surface of the sleeve 30f and the stopper portion 9a of the fuel supply pipe 9 come into contact with each other, a part of the valve body 30 is formed. By deforming the elastic body 30e, it is possible to effectively mitigate the impact generated due to the inertia of the valve body 30 when it collides with the stopper portion 9a. On the other hand, when the bare ball 30a is seated on the seat portion 3a, the elastic body 30e is similarly deformed, and the impact on the seat portion 3a can be alleviated. In this way, the elastic body 30e absorbs and relaxes the shock generated when the valve body 30 is opened and closed, whereby the noise caused by the shock can be effectively reduced.

The pipe members 30b and 30c do not have to be formed of a magnetic material, and may be formed of a non-magnetic material. However, the sleeve 30f is made of a magnetic material. Further, in this embodiment, the spring 5 is held at the upper portion of the valve body, but the spring may be held inside the armor chair as in the conventional example shown in FIG. Further, the cross-sectional shape of the pipe members 30b and 30c and the sleeve 30f is preferably a cylindrical shape for embedding the spring 5, but it is a shape in which a part of the cylinder is cut out (for example, a roll-formed pipe). , Etc.) may be used.

Next, a second embodiment will be described. The fuel injection valve 1 according to the second embodiment is obtained by changing only the valve body of the fuel injection valve 1 according to the first embodiment shown in FIG. Will be described with reference to FIG. According to FIG. 2 (A), the valve body 40 includes a bearing ball 40a, an armor chair including a pipe member 40b, a pipe member 40c, and a sleeve 40f, a fuel passage 40d, and an elastic portion 40e. There is. The bearing ball 40a and the pipe member 40b are joined together by, for example, welding or an adhesive, and the elastic member 40e (several parts shown in FIG. 2B) is provided between the pipe member 40b and the pipe member 40c. A window opening structure, etc.) is formed. When the pipe members 40b and 40c and the elastic portion 40e are integrally formed, the manufacturing cost and the like can be reduced.

As shown in FIGS. 2B and 2C, the elastic portion 40e is located between the pipe material 40b and the pipe material 40c, and extends substantially perpendicular to the sliding direction of the valve body 40. It is composed of several windows 40g which are opened side by side at intervals. In this embodiment, a pair of sides of the four sides of the window 40g in the sliding direction (that is, the axial direction) of the valve body 40 is formed at an angle with the sliding direction of the valve body 40. The deformation of the elastic portion 40e, which will be described later, is prevented from deforming outward, and the pipe member 40b and the pipe member 40c are deformed in a twisting direction.

According to the configuration of the second embodiment, when the valve body 40 is opened and closed similarly to the first embodiment, when the upper end surface of the sleeve 40f and the stopper portion 9a come into contact with each other. In addition, the elastic portion 40e forming a part of the valve element 40 is deformed, so that the impact generated by the inertia of the valve element 40 at the time of contact with the stopper portion 9a is effective as in the first embodiment. Can be relaxed. On the other hand, even when the bearing ball 40a is seated on the seat portion 3a of the nozzle body 3, the elastic portion 40e is similarly deformed, so that the impact on the seat portion 3a can be mitigated.

Here, the deformation of the elastic portion 40e is performed by the deformation of the window portion 40g. The pair of sides of the window portion 40g in the sliding direction of the valve body 40 are defined as follows. Since the pipe member 40b and the pipe member 40c are deformed in a twisting direction by forming the pipe member 40b at an angle with the sliding direction, it is possible to prevent the window portion 40g from being deformed in the outer peripheral direction, and It is possible to prevent such contact. The angle formed by the pair of sides of the window portion 40g in the sliding direction of the valve body 40 and the sliding direction of the valve body 40 is appropriately set so that contact with the nozzle body support cap 6 does not occur. I like to do it.

In each of the above-mentioned embodiments, the fuel injection valve having the structure of the valve body in which the ball bearing and the armchair part formed of the pipe material are coupled has been described, but the present invention devises such a fuel injection valve. The present invention is not limited to the above, but can be applied to a fuel injection valve having an integral valve body that is formed by cutting an ordinary solid material. Further, in each of the above-mentioned embodiments, the armor chair part is divided into two, but it may be divided into a plurality of parts if necessary.

[0019]

[Effect of device]

 As described above, according to the present invention, in a fuel injection valve that moves and opens and closes in the axial direction until the valve body is seated on the opening / closing position regulating surface, the axially intermediate portion of the valve body has an elastic structure. As a result, the impact generated when the valve body is seated on the seat part and when the valve body collides with the stopper part is absorbed and relieved by the elastic structure. Noise can be reduced.

[Brief description of drawings]

FIG. 1A is a vertical sectional view of a fuel injection valve according to a first embodiment. (B) is an enlarged sectional view of a joint portion of the valve body shown in (A).

FIG. 2A is a longitudinal sectional view of a fuel injection valve according to a second embodiment. (B) is an enlarged sectional view of a joint portion of the valve body shown in (A). (C) is an enlarged cross-sectional view of a joint portion of the valve body shown in (A) by another method.

FIG. 3A is a vertical sectional view of a valve body of a fuel injection valve according to a third embodiment. (B) is an enlarged view of the elastic portion of the valve body shown in (A). (C) is a development view of (B).

[Explanation of symbols]

 1 Fuel injection valve 3 Nozzle body 3a Seat part 9a Stopper part 30 Valve body 30a Bearing ball 30b Pipe material 30c Pipe material 30e Elastic body

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[Procedure amendment]

[Submission date] August 14, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

FIG . 2A is a vertical sectional view of a valve body of a fuel injection valve according to a second embodiment. (B) is the elasticity of the valve body shown in (A)
FIG . (C) is a development view of (B) .

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

FIG. 3 is a vertical sectional view of a conventional fuel injection valve .

Claims (1)

[Scope of utility model registration request] 1. A fuel injection valve that axially moves and opens and closes until the valve body is seated on an opening / closing position regulating surface, wherein an intermediate portion in the axial direction of the valve body has an elastic structure. .