JPH09291866A - Injector fixing device of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably perform assembly of an injector in relation to a fuel tube through a clip. SOLUTION: A pinching part 31 to be engaged with an annular groove 11 and for preventing an injector 1 from slipping off is formed on a clip 3, and a slit 33 to be engaged with a collar part 23 and for preventing a fuel tube 2 from slipping off is formed on the clip 3. An opening part 37 to be engaged with an arm part 24 in assembly to the fuel tube 2 and to be taken as a rotational fulcrum of the clip 3 is formed on the clip 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved injector fixing device for an engine.

[0002]

2. Description of the Related Art As a fuel supply device provided in an automobile engine, there is one in which an electromagnetic injector for injecting fuel into an intake manifold is attached to each cylinder.

As a fixing device for such an injector,
For example, the one disclosed in Japanese Patent Application Laid-Open No. 2-240495 includes a fuel tube for supplying fuel to the injector of each cylinder, and a plastic clip for connecting the injector to the fuel tube.

A component in which the injector of each cylinder is connected to the fuel tube through a clip is provided as a unit, and the fuel tube, the clip and the injector of each cylinder are integrally assembled to the intake manifold during engine production. , Productivity can be improved by reducing the number of parts assembled to the engine.

[0005]

However, in such a conventional injector fixing device for an engine, when the injector is assembled to the fuel tube through the clip, the clip is elastically deformed and engaged with the fuel tube. Due to this structure, if the direction in which the clip is pushed into the fuel tube is deviated, the position where the injector is attached to the fuel tube may become defective.

The present invention has been made in view of the above problems, and in an injector fixing device for an engine,
The purpose is to securely attach the injector to the fuel tube through the clip.

[0007]

An injector fixing device for an engine according to a first aspect of the present invention is an injector fixing device for injecting fuel into an engine, a fuel tube for supplying fuel to the injector, and a clip for connecting the injector to the fuel tube. In the injector fixing device for an engine, including: an annular groove is formed in the injector, and a clip is formed with a sandwiching portion that engages with the annular groove to prevent the injector from coming off. And a slit is formed on the clip to prevent the fuel tube from coming off by engaging with the flange portion, an arm portion protruding from the fuel tube is formed, and at the time of assembling the clip to the fuel tube, the arm portion is formed. Engagement and pivot fulcrum of clip Made to form an opening.

According to a second aspect of the present invention, there is provided an injector fixing device for an engine according to the first aspect, further comprising a rotation locking means for locking the rotation of the clip with respect to the injector.

According to a third aspect of the present invention, there is provided an injector fixing device for an engine according to the second aspect, further comprising a connector for connecting a cable to the injector, wherein the arm portion is arranged so as to project to a side opposite to the connector. .

According to a fourth aspect of the present invention, there is provided an injector fixing device for an engine according to any one of the first to third aspects, wherein a pair of flanges guide the collar portion to the slit when the clip is attached to the fuel tube. A guide part is formed.

[0011]

In the injector fixing device for an engine according to the first aspect of the present invention, at the time of assembling the engine, the clip is pulled out from the injector by engaging the holding portion of the clip with the annular groove of the injector while bending the clip. Can be locked.

Then, by engaging the slit of the clip with the collar portion of the fuel tube while bending the clip, the clip and the injector are prevented from falling out of the fuel tube.

At this time, by inserting the arm portion projecting from the fuel tube into the opening of the clip and rotating the injector and the clip around the opening as a fulcrum, the direction in which the clip is pressed against the fuel tube is limited, and the slit is cut. Can be securely engaged with the collar portion of the fuel tube.

In the injector fixing device for an engine according to a second aspect of the present invention, the rotation of the clip with respect to the injector is locked, and the arm portion of the fuel tube engages with the opening of the clip, whereby the clip and injector with respect to the fuel tube. Rotation is locked. In this way, by holding the injector at a predetermined rotational position with respect to the fuel tube, it becomes unnecessary to adjust the rotational position when the injector is assembled to the intake manifold or the like.

In the injector fixing device for an engine according to a third aspect of the present invention, the arm portion is arranged so as to project to the side opposite to the connector, and the injector and the clip are provided with the opening engaging with the arm portion as a rotation fulcrum. When the connector is rotated, it is avoided that the connector interferes with the fuel tube or the like.

In the injector fixing device for an engine according to a fourth aspect of the present invention, when the clip is bent and the slit is engaged with the flange portion of the fuel tube during assembly, the opening engaging with the arm portion is used as a rotation fulcrum. Also, when the clip is rotated, the clip is pushed and expanded while sliding the collar portion against the guide portion and guided to the slit.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, 1 is an injector for injecting fuel into an intake passage of an engine, 2 is a fuel tube for guiding fuel, and 3 is a clip for connecting the injector 1 and the fuel tube 2.

The tip end of the injector 1 is fitted into a mounting hole (not shown) on the intake manifold side through a seal ring 4 and is mounted so as to face the intake port. An injection port for injecting fuel is opened at the tip of the injector 1.

A connector 5 is provided in the middle of the injector 1, and a cable connected via the connector 5 extends to the control unit. The injector 1 is opened by the pulse signal sent from the control unit,
Inject fuel into the intake port.

Fuel pressurized by a fuel pump (not shown) is sent to the fuel tube 2, and is distributed from the fuel tube 2 to the injector 1 provided for each cylinder. The fuel pressure in the fuel tube 2 is adjusted via a pressure regulator (not shown) so that the pressure difference between the fuel tube 2 and the intake passage becomes a predetermined value.

The fuel tube 2 has a pipe portion 21 extending in the cylinder column direction, and a cylinder portion 22 protruding from the pipe portion 21 in a cylindrical shape with respect to each injector 1.

The injector 1 has its base end portion fitted into the tubular portion 22 of the fuel tube 2 through the seal ring 5, and the fuel introduced through the pipe portion 21 receives the fuel.
Be led to. An inlet for introducing fuel is opened at the base end of the injector 1.

Parts in which the injector 1 of each cylinder is connected to the fuel tube 2 via the clip 3 are provided as a unit. At the time of engine production, the fuel tube 2, the clip 3, and the injector 1 of each cylinder are integrally assembled to the intake manifold, so that the number of parts to be assembled to the engine is reduced and the productivity is improved.

The clip 3 has a holding portion 31 that engages with the injector 1 and a slit 33 that engages with the fuel tube 2, and is locked to prevent the injector 1 from falling out of the fuel tube 2.

An annular groove 11 is formed in the middle of the injector 1. The clip 3 is a pair of holding parts 3 facing each other.
1 is integrally formed. Each sandwiching portion 31 is formed such that its inner peripheral edge portion is curved in an arc shape along the annular groove 11, and engages with the annular groove 11 to sandwich the injector 1.

The clip 3 has a spring portion 32 bent in a U-shape so as to surround the injector 1. Each of the sandwiching portions 31 is formed so as to be connected to the front and rear portions of the spring portion 32, and the spring portion 32 is bent so as to be widened to engage with the annular groove 11 of the injector 1.

At the tip of the tubular portion 22 of the fuel tube 2, a collar portion 23 protruding in an annular shape is formed. Clip 3
A pair of slits 33 that engage with the collar portion 23 are formed in the front and rear portions of the spring portion 32. The slits 33 are engaged with the flange portion 23 and face each other so as to sandwich the fuel tube 2 therebetween. Each slit 33 has a spring portion 3
As shown in FIG. 6, it is adapted to engage with the flange portion 23 of the fuel tube 2 by expanding the distance while bending the tube 2.

A pair of guide portions 38 for guiding the collar portion 23 to the slit 33 when the clip 3 is assembled to the fuel tube 2 are formed. Each guide portion 38 is
It is formed so as to be connected to the front and rear portions of the spring portion 32 and has a shape that expands toward the fuel tube 2. When the clip 3 is assembled to the fuel tube 2, the spring portion 32 is expanded while the collar portion 23 is slidably contacting each guide portion 38, and each slit 33 is engaged with the collar portion 23 of the fuel tube 2. ing.

In this way, the clip 3 has its holding portion engaged with the annular groove 11 of the injector 1, and the slit 33 thereof engaged with the flange portion 23 of the fuel tube 2, so that the injector 1 falls off from the fuel tube 2. Is designed to be locked.

As a rotation locking means for locking the rotation of the clip 3 with respect to the injector 1, a projection 12 is formed in the middle of the injector 1, while a projection 1 is formed on the clip 3.
One recess 34 that engages 2 is integrally formed. Recess 3
The engagement of 4 with the projection 12 locks the rotation of the clip 3 with respect to the injector 1.

The protrusion 12 has a rectangular parallelepiped shape. On the other hand, the concave portion 34 is composed of a portion 35 having a rectangular cross section and recessed in a concave shape, and a guide portion 36 expanding in a tapered shape.

The projection 12 projects on the side of the injector 1 opposite to the connector 5. On the other hand, the concave portion 34 is the spring portion 32.
Is integrally formed by being connected to the side part of.

The clip 3 has its recess 34 engaged with the projection 12 of the injector 1 so that the spring 32 is
Is held in a rotational position with its side opposite the connector 5.

An arm portion 24 is formed at the tip of the tubular portion 22 of the fuel tube 2. An opening portion 37 that engages with the arm portion 24 is formed in the clip 3. Opening 37
By engaging the arm portion 24 with the, the rotation of the clip 3 with respect to the fuel tube 2 is locked.

The arm portion 24 is formed so as to be connected to the collar portion 23 of the fuel tube 2 so as to project therefrom. On the other hand, the opening 37 opens to the side of the spring portion 32.

The arm portion 24 is formed so as to project from the side portion of the fuel tube 2 to the side opposite to the connector 5. By engaging the arm portion 24 with the opening portion 37, the injector 1 is held in the fuel tube 2 at a predetermined rotational position via the connector 5, and the connector 5 is arranged between the fuel tube 2 and the engine body.

The arm portion 24 is inserted into the opening portion 37 when the clip 3 is assembled to the fuel tube 2 and serves as a pivot point.

A hook portion 25 is formed at the tip of the arm portion 24 by being bent toward the pipe portion 21 side. When the injector 1 is assembled to the fuel tube 2 via the clip 3, the arm portion 24 is prevented from coming off the opening portion 37 via the hook portion 25.

The operation will be described below.

The fuel tube 2, the clip 3, and the injector 1 of each cylinder are assembled as a unit component by the procedure described below before being assembled to the intake manifold.

First, each clip 3 is assembled to each injector 1. The clip 3 is assembled to the injector 1 by pushing and expanding the spring portion 32 while bending the spring portion 32 to engage the holding portions 31 with the annular groove 11 of the injector 1.

In this state, the holding portion 31 of the clip 3 engages with the annular groove 11 of the injector 1 to prevent the clip 3 from falling out of the injector 1.

By engaging the recess 34 of the clip 3 with the projection 12 of the injector 1, rotation of the clip 3 with respect to the injector 1 is locked.

Subsequently, as shown in FIG. 7, each injector 1 is attached to the fuel tube 2 via each clip 3. The arm portion 24 of the fuel tube 2 is inserted into the opening portion 37 of the clip 3, and each slit 33 is engaged with the flange portion 23 of the fuel tube 2.

At the time of this assembly, the fuel tube 2
Insert the arm part 24 of the into the opening 37 of the clip 3,
By rotating the injector 1 and the clip 3 with the opening 37 engaging with the arm portion 24 of the fuel tube 2 as a fulcrum, the direction in which the clip 3 is pressed against the fuel tube 2 is limited, and each slit 33 is attached to the fuel tube. It can be securely engaged with the second collar portion 23.

By disposing the arm portion 24 so as to project to the side opposite to the connector 3, the connector 3 is rotated when the injector 1 and the clip 3 are rotated with the opening portion 37 engaging with the arm portion 24 as the rotation fulcrum. Avoids interfering with the fuel tube 2 and the like.

When the injector 1 and the clip 3 are rotated about the opening 37 engaging with the arm 24 as a rotation fulcrum, the spring portion 32 is expanded by sliding the collar portion 23 onto each guide portion 38, Guide to each slit 33.

In this assembled state, the collar portions 23 of the fuel tube 2 are connected to the slits 3 of the clip 3.
By engaging with 3, the clip 3 and the injector 1 are locked from falling off with respect to the fuel tube 2.

By engaging the arm portion 24 of the fuel tube 2 with the opening portion 37 of the clip 3,
The rotation of the clip 3 and the injector 1 with respect to the fuel tube 2 is locked. In this way, the injector 1 is held at a predetermined rotational position with respect to the fuel tube 2, so that the connector 5 is interposed between the fuel tube 2 and the engine body in a state where each injector 1 is assembled to the intake manifold. It is placed in place.

[0051]

As described above, according to the injector fixing device for an engine according to the first aspect of the present invention, the arm portion projecting from the fuel tube is inserted into the opening portion of the clip at the time of assembly, and the injector and the clip are opened. Since it is configured to rotate with the fulcrum as a fulcrum, the direction in which the clip is pressed against the fuel tube is limited, and the slit can be reliably engaged with the flange portion of the fuel tube, and the quality can be improved.

According to the engine injector fixing device of the second aspect, the rotation of the clip with respect to the injector is locked and the arm portion of the fuel tube is engaged with the opening portion of the clip. When the injector is assembled to the intake manifold or the like, there is no need to adjust the rotational position of the injector, which improves productivity.

According to the injector fixing device for an engine of the third aspect, since the arm portion is arranged so as to project to the side opposite to the connector, the opening portion engaged with the arm portion is rotated. When the injector and the clip are rotated as a fulcrum, the connector is prevented from interfering with the fuel tube or the like.

According to the injector fixing device for an engine of the fourth aspect, since the clip is formed with the pair of guide portions for guiding the collar portion to the slit when the clip is assembled to the fuel tube, the opening portion for engaging the arm portion is formed. With the rotation of the injector and the clip as the rotation fulcrum, the clip is expanded and guided to the slit while the collar portion is in sliding contact with the guide portion, thereby improving the productivity.

[Brief description of drawings]

FIG. 1 is a side view of an injector and the like showing an embodiment of the present invention.

FIG. 2 is a front view of an injector and the like.

FIG. 3 is a plan view of the clip.

FIG. 4 is a side view of the clip.

FIG. 5 is a front view of the clip.

FIG. 6 is a perspective view of the fuel tube and the clip.

FIG. 7 is an explanatory view showing how the injector is assembled to the fuel tube.

[Explanation of symbols]

 1 Injector 2 Fuel tube 3 Clip 11 Annular groove 12 Protrusion 21 Pipe part 22 Cylindrical part 23 Collar part 24 Arm part 25 Hook part 31 Clamping part 32 Spring part 33 Slit 34 Recess 37 Opening 38 Guide part

Claims (4)

[Claims] 1. An injector fixing device for an engine, comprising: an injector for injecting and supplying fuel to an engine; a fuel tube for supplying fuel to the injector; and a clip for connecting the injector to the fuel tube, wherein an annular groove is formed in the injector. At the same time, a clip is formed with a nipping part that engages with the annular groove to prevent the injector from coming off, and a flange part that protrudes like a disc is formed on the fuel tube, while the clip is engaged with the flange part and the fuel tube A slit is formed to prevent slipping off of the fuel tube, an arm portion protruding from the fuel tube is formed, and an opening that serves as a fulcrum of rotation of the clip is formed on the clip when the clip is assembled to the fuel tube. Engine injector characterized by Constant apparatus. 2. The injector fixing device for an engine according to claim 1, further comprising a rotation locking means for locking the rotation of the clip with respect to the injector. 3. The injector fixing device for an engine according to claim 2, further comprising a connector for connecting a cable to the injector, wherein the arm portion is arranged so as to project to a side opposite to the connector. 4. The injector fixing of the engine according to claim 1, wherein the clip is formed with a pair of guide portions for guiding the collar portion to the slit when the clip is assembled to the fuel tube. apparatus.