JP3862308B2 - Protective cover for fuel injection pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a protective cover for a fuel injection pipe, and more particularly to a protective cover that is formed in a cylindrical shape by joining a pair of semi-cylindrical bodies and attached to an inlet portion of the fuel injection pipe.
[0002]
[Prior art]
A fuel tank of an automobile is provided with a fuel injection pipe for injecting fuel. Generally, a protective cover is provided at an inlet portion of the fuel injection pipe to protect the inlet portion. For example, in Japanese Utility Model Publication No. 6-259, the cover is cut into two pieces of the same shape in the axial direction, and each cut end face is joined to the outer surface of the pipe member or the like so as to tightly surround the outer surface of the pipe member or the like. A resin cylindrical cover that can be assembled or separated into a cylindrical shape is disclosed.
[0003]
Further, in Japanese Patent Laid-Open No. 4-215524, the above-described cylindrical cover is a conventional technique, and in order to ensure sealing performance, the semi-cylindrical body is composed of two half cylinders having substantially the same shape. An inner cylinder which is made cylindrical by abutting the end face of the other semi-cylindrical body with the end face of the other semi-cylindrical body, and a cylindrical outer cylinder which is fitted to the outside of the inner cylinder and holds the inner cylinder A cylinder assembly including a body has been proposed.
[0004]
In addition, Japanese Utility Model Publication No. 5-25305 discloses a hook-shaped body that is freely opened and closed with a vertical hinge as a center, and overlaps with the vertical opening and closing edges of both the hook-shaped bodies in the radial direction together with the closure. There is disclosed a protective cover pipe for a fuel injection pipe provided with an edge and a groove or convex portion on an inner surface that fits into an engagement irregularity formed on the outer peripheral surface of the injection pipe.
[0005]
[Problems to be solved by the invention]
The conventional protective covers described above are formed in a cylindrical shape by joining a pair of semi-cylindrical bodies, but the joining structures of the pair of semi-cylindrical bodies are different. Since the protective cover described in Japanese Utility Model Publication No. 6-259 is supposed to be separable in nature, there is a possibility that the joint part may come off when an external force is applied to the protective cover from the inside to the outside. Similarly, in the protective cover described in Japanese Utility Model Publication No. 5-25305, when an external force is applied from the inside to the outside, the joint portion may be detached.
[0006]
On the other hand, as in the cylinder assembly described in JP-A-4-215524, if the outer cylinder is fitted into a pair of inner cylinders to form a double cylinder, the joint of the inner cylinder will not come off. The number of parts becomes three, the material and assembly man-hours increase, and the cost increases. In addition, a structure that welds the joining end faces of a pair of semi-cylindrical bodies is also known (not shown). In addition to requiring a welding device, the above-mentioned assembly method, such as misalignment during welding and occurrence of burrs, is also known. Compared with this, joining is difficult and the cost is increased.
[0007]
Accordingly, the present invention relates to a protective cover for a fuel injection pipe, and provides a protective cover having a joined structure that is easily and reliably joined to form a cylindrical shape and that is not easily detached after joining. Let it be an issue.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a fuel injection method in which a pair of semi-cylindrical bodies having the same shape are joined to each other so that the joining end faces meet each other and formed into a cylindrical shape having a joining line in the axial direction. In the protective cover of the fuel injection pipe attached to the inlet of the pipe, a first hole having an opening cross section within the range of the joint end face on one side of each joint end face of the pair of semi-cylindrical bodies, A second hole having an opening cross section larger than that of the first hole and continuously extending in a direction away from the joining end face of the semi-cylindrical body while forming a step at the boundary with the first hole; An engagement hole that extends in the joining direction of the semi-cylindrical body at a position facing the first hole on the other side of the joining end surface of each of the pair of semi-cylindrical bodies, and when contracted, the first An engagement protrusion that is inserted into the second hole and enters the second hole, and engages with the step portion when restored. Those were.
[0009]
In the protective cover for the fuel injection pipe, an auxiliary hole having an opening cross section within the range of the joint end face is provided on one side of the joint end face of each of the pair of semi-cylindrical bodies. It is desirable that an auxiliary projection that extends in the bonding direction of the semi-cylindrical body and fits into the auxiliary hole is provided at a position facing the auxiliary hole on the other side of each bonding end surface.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 8 shows a state where the protective cover according to the embodiment of the present invention is attached to the fuel injection pipe, and the retainer 5 is joined to the inside of the opening of the fuel injection pipe 4 whose one end is connected to a fuel tank (not shown). In addition, a protective cover (only the semi-cylindrical body 1 is shown in FIG. 8) including a pair of semi-cylindrical bodies 1 and 2 is attached to the outside thereof. Further, as indicated by a two-dot chain line, a shield member 6 is provided that contacts the outer surface of the semi-cylindrical body 1 and closes the gap with the vehicle body (not shown). The fuel injection pipe 4 is configured to be sealed when a cap 7 indicated by a two-dot chain line is attached to the opening of the retainer 5.
[0011]
The protective cover of this embodiment is composed of a pair of synthetic resin half-cylinders 1 and 2 as shown in FIG. 1, and when these are joined, a cylindrical shape having a joining line 3 in the axial direction as shown in FIG. Become. The semi-cylindrical bodies 1 and 2 have the same shape, and an engagement hole 10 and an auxiliary hole 30 are formed on one joint end surface of each, and an engagement projection 20 and an auxiliary projection 40 are formed on the other joint end surface. ing. Further, ribs 1f and 2f are respectively formed in the circumferential direction on the outer surfaces of the semi-cylindrical bodies 1 and 2 (the rib 1f appears in FIGS. 3 and 6). Since these half cylinders 1 and 2 have the same shape, one half cylinder 1 will be described in the following description.
[0012]
As shown in FIGS. 3 to 5, the engaging hole 10 has an opening cross section within the range of the joining end face 1 a (the lower side in FIG. 5) and extends in the left-right direction in FIGS. 3 and 4. The hole 11 has a larger opening cross section than the first hole 11, and is continuously separated from the joint end face while forming a step portion 13 at the boundary (vertical direction in FIG. 3) with the first hole 11. It consists of a second hole 12 extending in the direction. The second hole 12 penetrates the outer surface of the semi-cylindrical body 1, and thus an opening 12a is formed. Further, an auxiliary hole 30 having an opening cross section within the range of the end surface and extending in the left-right direction in FIGS. 3 and 4 is formed in the joining end surface 1b (upper side in FIG. 5) of the semi-cylindrical body 1. Yes.
[0013]
On the other hand, the engagement projection 20 is integrally formed at a position facing the first hole 11 on the joint end surface on the other side of the semi-cylindrical body 1, and the auxiliary projection 40 is formed at a position facing the auxiliary hole 30. ing. In FIG. 3, the engagement protrusion 20 and the auxiliary protrusion 40 on the semicylindrical body 1 side are originally shown by solid lines, but are shown by two-dot chain lines for easy understanding. The engaging protrusion 20 extends from the joining end face of the semi-cylindrical body 1 in the joining direction (direction perpendicular to the joining end face), and extends from the distal end of the body part 21 toward the base 23 to expand. A pair of arm portions (represented by 22 as a representative) are integrally formed. These arm portions 22 are normally in an expanded state as shown in FIG. 3, and when the free end portion is pressed in the direction of the main body portion 21, the arm portions 22 bend in the same direction and pass through the first hole 11 in a contracted state. It is configured to be able to. Further, the auxiliary protrusions 40 formed at positions facing the auxiliary holes 30 are formed so as to be able to fit into the auxiliary holes 30, and these are provided for positioning when the semi-cylindrical bodies 1 and 2 are joined.
[0014]
In the present embodiment, when assembling the protective cover having the above-described configuration to the fuel injection pipe, one semi-cylindrical body 1 is disposed around the fuel injection pipe 4 and the retainer 5 as shown in FIG. Are assembled so that the joining end face of the other half-cylindrical body 2 abuts. At this time, the auxiliary protrusions 40 of the semi-cylindrical bodies 1 and 2 are inserted into the auxiliary holes 30 for positioning, and the engaging protrusions 20 are inserted into the first holes 11 of the engaging holes 10. When the engagement protrusion 20 is inserted into the first hole 11, the pair of arm portions 22 bends in the direction of the main body portion 21, and the distal end portion enters the second hole 12. When the semicylindrical body 2 is pushed in the direction of the semicylindrical body 1 until the base portion 23 is fitted in the first hole 11, the pair of arm portions 22 enters the second hole 12. As a result, the pair of arm portions 22 are expanded and restored, and the initial state is obtained as shown in FIG. 7, and the tips of the arm portions 22 are engaged with the step portions 13.
[0015]
That is, the engagement protrusion 20 is received and locked in the engagement hole 10 including the first and second holes 11 and 12, and the arm portion 22 of the engagement protrusion 20 is expanded as shown in FIG. The half-cylinders 1 and 2 are firmly joined. Further, since the engagement protrusion 20 is completely accommodated in the engagement hole 10, it is not easily detached even when an external force is applied. When it is necessary to separate the semi-cylindrical bodies 1 and 2, a jig (not shown) is inserted from the opening 12a (FIG. 3) of the second hole 12, and the pair of arm portions 22 are attached to both side surfaces. The arm portion 22 and the stepped portion 13 are released, so that the engaging protrusion 20 can be taken out through the first hole 11.
[0016]
Thus, as shown in FIG. 8, the inlet portions of the fuel injection pipe 4 and the retainer 5 are surrounded by the protective cover comprising the pair of semi-cylindrical bodies 1 and 2 described above, and are suitable for impact from the outside. Protected. When the cap 7 is screwed into the retainer 5, the fuel injection pipe 4 is sealed. Since the semi-cylindrical bodies 1 and 2 have the same shape in the above-mentioned protective cover, it is sufficient to prepare one kind of component. However, the engaging hole 10 and the auxiliary hole 30 are provided on both joint end faces of the semi-cylindrical body on one side. It is good also as forming the engaging protrusion 20 and the auxiliary | assistant protrusion 40 in both the joint end surfaces of the other half-cylindrical body, and comprising a protective cover by these two types of components.
[0017]
【The invention's effect】
Since this invention is comprised as mentioned above, there exists an effect as described below.
That is, the protective cover for the fuel injection pipe of the present invention is formed by joining a pair of semi-cylindrical bodies having the same shape so that the respective joining end faces collide with each other and forming a cylindrical shape having a joining line in the axial direction. A first hole having an opening cross section within the range of the joint end face on one side of each joint end face of the pair of semi-cylindrical bodies, and a first hole having an opening cross section larger than the first hole; An engagement hole comprising a second hole continuously extending in a direction away from the joint end face of the semi-cylindrical body while forming a step at the boundary of the joint, and each joint end face of the pair of semi-cylindrical bodies Extends in the joining direction of the semi-cylindrical body at a position opposite to the first hole on the other side, enters the second hole through the first hole when contracted, and engages the stepped portion when restored Because it has an engaging projection that can be configured easily and inexpensively with a pair of parts of the same shape, external force is applied Without easily removed, it can be held reliably joined condition.
[0018]
In the protective cover according to claim 2, since the auxiliary protrusion is fitted in the auxiliary hole and the engaging protrusion is engaged with the engaging hole, positioning at the time of joining is easy. And since each joining end surface is joined by two places, the stable joining state can be ensured.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a protective cover of a fuel injection pipe according to an embodiment of the present invention.
FIG. 2 is a perspective view of a protective cover for a fuel injection pipe according to an embodiment of the present invention.
FIG. 3 is a front view showing a joined state of a pair of semi-cylindrical bodies constituting a protective cover according to an embodiment of the present invention.
4 is a cross-sectional view showing a joined state of a pair of semi-cylindrical bodies constituting a protective cover according to an embodiment of the present invention, and is a cross-sectional view taken along line AA in FIG.
FIG. 5 is a side view of one semi-cylindrical body constituting a protective cover according to an embodiment of the present invention.
6 is a cross-sectional view showing a joined state of a pair of semi-cylindrical bodies constituting a protective cover according to an embodiment of the present invention, and is a cross-sectional view taken along line BB in FIG.
FIG. 7 is an enlarged cross-sectional view showing a part of a joint portion of a pair of semi-cylindrical bodies according to an embodiment of the present invention.
FIG. 8 is a cross-sectional view showing a structure of an inlet portion of a fuel injection pipe equipped with a protective cover according to an embodiment of the present invention.
[Explanation of symbols]
1, 2 Semi-cylindrical body 4 Fuel injection pipe 5 Retainer 10 Engagement hole 11 First hole 12 Second hole 13 Step 20 Engagement protrusion 30 Auxiliary hole 40 Auxiliary protrusion

Claims (2)

A pair of semi-cylindrical bodies having the same shape are joined so that their joining end faces meet each other , formed into a cylindrical shape having a joining line in the axial direction, and protection of the fuel injection pipe attached to the inlet portion of the fuel injection pipe The cover has a first hole having an opening cross section within the range of the joint end face on one side of each joint end face of the pair of semi-cylindrical bodies, and an opening cross section larger than the first hole. An engaging hole comprising a second hole continuously extending in a direction away from the joining end face of the semi-cylindrical body while forming a step at the boundary with the first hole; Extending in the joining direction of the semi-cylindrical body at a position facing the first hole on the other side of each joining end surface of the cylindrical body, and passing through the first hole when contracted, into the second hole A protective cover for a fuel injection pipe, comprising an engagement protrusion that enters the step and engages with the step portion when restored.   An auxiliary hole having an opening cross section within the range of the joint end face is provided on one side of the joint end face of each of the pair of semi-cylindrical bodies, and the auxiliary hole on the other side of the joint end face of each of the pair of semi-cylindrical bodies. 2. A protective cover for a fuel injection pipe according to claim 1, further comprising an auxiliary protrusion that extends in a joining direction of the semi-cylindrical body and is fitted in the auxiliary hole at a position opposite to the semi-cylindrical body.

Images