JP4084600B2 - Element coupling device in an injector for an internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an element coupling device in an injector for coupling two elements arranged coaxially with each other in an injector for an internal combustion engine.
[0002]
[Prior art]
For example, it is suitable for the case where the connector part of the back leak rail is coaxially arranged and coupled to the back flow port of the injector used to inject and supply the fuel into the cylinder of the internal combustion engine. As an element coupling device, Japanese Patent Application Laid-Open No. 2001-241484 includes a first element having a guide opening and a second element having a guide section that can be inserted into the guide opening of the first element. The first element wall has two holding openings positioned opposite each other, aligned with each other and aligned with a holding groove provided in the second element. The leg portion having at least one corrugated portion of a U-shaped bracket formed as a spring element passes therethrough. Thus apparatus designed to combine these two elements to be coaxially disposed is disclosed.
[0003]
FIG. 7 shows an example of the conventional coupling device described above. FIG. 7 shows a case where the connector part 111 of the back leak rail 110 shown in FIG. 8 is inserted into the cylindrical back flow port 101 of the injector 100 and the both elements are coaxially arranged. It is an example of the conventional coupling device for sending the fuel from the back flow port 101 to the back leak rail 110 via the connector part 111, without leaking outside.
[0004]
Here, the back flow port 101 is formed as a cylindrical housing bush for housing the connector portion 111, and the connector portion 111 of the back leak rail 110 has a holding groove 112 at its base portion as shown in FIG. 7. Is formed. The backflow port 101 is formed with a pair of openings 102 and 103 that face the holding groove 112 when the connector portion 111 is positioned at a predetermined accommodation position in the backflow port 101.
[0005]
The U-shaped bracket 120 formed as a spring element is attached to the backflow port 101 with the recesses 121A and 122A of the pair of legs 121 and 122 engaging with the holding grooves 112 from the openings 102 and 103. The connector part 111 is pushed into the backflow port 101 and pushed down, whereby the gap between the leg parts 121 and 122 is widened by the tapered surface 114 of the connector part 111, and the concave parts 121A and 122A of the leg parts 121 and 122 are held. The bracket 120 is engaged with the groove 112, and the recesses 121A and 122A are brought into pressure contact with the peripheral surface 113 of the holding groove 112, whereby the bracket 120 is positioned and fixed to the connector portion 111 by the spring force. And the connector 111 are firmly connected.
[0006]
[Problems to be solved by the invention]
However, according to the conventional configuration described above, the spring force of the bracket is increased in order to prevent the bracket from coming off after the leg portion of the U-shaped bracket is once fitted in the holding groove of the connector portion. There is a need. For this reason, when one element is pushed into the other element in order to connect two coaxially arranged elements, the insertion load becomes considerably large, which increases the labor for the operator and also reduces the workability. Has the problem.
[0007]
An object of the present invention is to provide an element coupling device in an injector for an internal combustion engine, which can solve the above-mentioned problems in the prior art.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, according to the invention of claim 1, the second element is inserted into the sleeve-shaped first element, and the first element and the second element are arranged coaxially with each other. For this purpose, a holding groove is provided on the outer periphery of the second element, and two holding openings that are aligned with each other and aligned with the holding groove are located opposite to each other on the peripheral wall of the first element. A pair of leg portions of a U-shaped clip member formed as a spring element passes through both holding openings, and the second element is pushed into the first element. Thus, the injector for the internal combustion engine is configured so that the required element coupling is achieved by engaging the retaining groove after the pair of legs are once expanded. In element binding device in data, the pair of which arcuate projections to be engaged into the retaining groove is formed on each of the legs, of the arc forming the respective curved surfaces of the projections of the pair of legs The clip member is attached to the first element so that a line connecting the centers deviates from the center of the diameter of the circumferential surface of the holding groove by a predetermined length, and the projecting portion extends from the two holding openings. An element coupling device in an injector for an internal combustion engine is proposed, wherein the clip member is attached to the first element in a state where the clip member protrudes inward of the second element.
[0009]
According to a second aspect of the present invention, in the first aspect of the present invention, the predetermined length is secured by changing a distance between the pair of holding openings along the axial direction of the clip member. An element coupling device in an injector for an internal combustion engine is proposed.
[0010]
According to the invention of claim 3, in the invention of claim 1 or 2, there is proposed an element coupling device in an injector for an internal combustion engine in which the clip member is formed as a spring element made of an elastic steel wire .
[0011]
According to a fourth aspect of the present invention, in the third aspect of the present invention, the clip member is formed by bending the steel wire material into a U shape so that one end is coupled by a transverse beam and the other end is expanded. An element coupling device in an injector for an internal combustion engine formed as a U-shaped member having a section is proposed.
[0012]
According to the invention of claim 5, in the invention of claim 1, the pair of clips in which the clip member is bent in a U shape by elastic steel wire, one end is coupled by a transverse beam and the other end is expanded. There is proposed an element coupling device in an injector for an internal combustion engine , which is formed as a U-shaped member having legs, and the protrusions are formed on the pair of legs by bending .
[0013]
According to a sixth aspect of the invention, there is provided an internal combustion engine for an internal combustion engine according to the fifth aspect, wherein a line connecting the vertices of the protrusions is deviated by a predetermined length from the center of the diameter of the circumferential surface of the holding groove . An element coupling device in an injector is proposed.
[0014]
According to a seventh aspect of the invention, in the first or fifth aspect of the invention, the outer periphery of the second element has a tapered surface that is tapered toward the front end of the connector member. An element coupling device in an injector for an internal combustion engine formed on the side is proposed.
[0015]
According to the invention of claim 8, in the invention of claim 1, there is proposed an element coupling device for an injector for an internal combustion engine , wherein the first element is a port member for a back flow of the injector.
[0016]
According to the ninth aspect of the present invention, there is proposed an element coupling device in an injector for an internal combustion engine , wherein the second element is a back leak rail connector member .
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an exemplary embodiment of the present invention will be described in detail with reference to the drawings.
[0020]
FIG. 1 is a schematic configuration diagram of a fuel injection system for an internal combustion engine including an element coupling device according to the present invention. In the internal combustion engine fuel injection system 200, the fuel in the fuel tank 201 is pressurized by the high-pressure pump 202 and accumulated in the common rail 203. The high pressure fuel in the common rail 203 is configured to be supplied from the port 203A to the injector body 2 of the injector device 1 through the high pressure pipe 205. A plurality of connector members 31 are provided on the back leak rail 3 connected to the pressure limiting valve 204, and the connector members 31 are coupled to the injector body 2 by an element coupling device described later.
[0021]
FIG. 2 shows a state in which the main part of the injector device 1 shown in the fuel injection system 200 for an internal combustion engine is disassembled. In the injector device 1, the connector member 31 of the back leak rail 3 is inserted into the cylindrical backflow port member 21 of the injector body 2, and the port member 21 and the connector member 31 are arranged coaxially with each other. It is connected and the fuel from the port member 21 is sent to the back leak rail 3 through the connector member 31.
[0022]
By pushing the connector member 31 into the port member 21, the connector member 31 is firmly connected in a state where it is coaxially arranged with the port member 21, so that fuel from the port member 21 does not leak to the outside. In order to be fed into the connector member 31, an element coupling device 4 is provided.
[0023]
FIG. 3 is a cross-sectional view of an essential part showing a main part of the element coupling device 4 in a state where the port member 21 and the connector member 31 are coupled by the element coupling device 4. Hereinafter, the element coupling device 4 will be described with reference to FIGS. 2 and 3.
[0024]
The element coupling device 4 is formed on the outer periphery of the connector member 31 in the vicinity of the base and in the form of an annular groove and the peripheral wall 22 of the port member 21 so as to face each other and extend in the circumferential direction. A pair of holding openings 42 and 43 are provided. These holding openings 42 and 43 are aligned with each other and also aligned with the holding groove 41. A pair of leg portions 45 and 46 of a U-shaped clip member 44 formed as a spring element made of an elastic steel wire passes through the holding openings 42 and 43, respectively.
[0025]
The leg portions 45 and 46 are coupled by a transverse beam 47 and extend substantially in parallel, and projecting portions 45A and 46A projecting inward in an arc shape with a radius R at each intermediate portion of the leg portions 45 and 46 are bent. It is formed so as to face each other, and expands in a hopper shape at the end portion.
[0026]
The holding openings 42 and 43 formed in the peripheral wall 22 are opened to a size that allows the corresponding protrusions 45 </ b> A and 46 </ b> A to be in pressure contact with the inner peripheral surface 41 </ b> A of the holding groove 41 of the connector member 31 inserted into the port member 21. . Since the protrusions 45A and 46A are engaged with the corresponding holding openings 42 and 43 as described above, the clip member 44 is held by the port member 21 in the state shown in FIG.
[0027]
On the other hand, in the connector member 31, a tapered surface 48 is formed on the distal end side of the holding groove 41, and the tapered surface 48 is formed so as to be narrowed toward the distal end. And the diameter of the front-end | tip part of the connector member 31 is formed in the dimension substantially the same as the outer diameter of 41 A of internal peripheral surfaces. An O-ring 31A is provided between the tapered surface 48 and the connector member 31 so as to be oil-tight, and the element coupling device 4 is configured so that fuel sent from the injector body 2 to the back leak rail 3 does not leak. Yes.
[0028]
When the connector member 31 is inserted into the port member 21, the holding openings 42 and 43 of the port member 21 are aligned with the holding groove 41 of the connector member 31. The outer diameter of the holding groove 41, that is, the diameter D1 of the inner peripheral surface 41A is substantially equal to the interval between the protrusions 45A and 46A of the clip member 44.
[0029]
Since the element coupling device 4 is configured as described above, when the connector member 31 is inserted into the port member 21 and pushed in, both the leg portions 45 and 46 are first expanded by the tapered surface 48 of the connector member 31, and the connector member 31 By further pressing 31, the protrusions 45 </ b> A and 46 </ b> A of both leg portions 45 and 46 are engaged in the holding groove 41, and the state shown in FIG. 3 is obtained. Once the protrusions 45A and 46A are engaged in the holding groove 41, both the leg portions 45 and 46 are squeezed by the spring force to prevent the connector member 31 from escaping from the port member 21, and the connector member 31 and the port member 21 can be kept in a tightly coupled state.
[0030]
When the coupling between the connector member 31 and the port member 21 is released, the projections 45A and 46A ride on the end portions 42b and 43b respectively by pushing the convex portion of the lateral beam 47 toward the peripheral wall 22 side. The portions 45 and 46 are expanded, so that the engagement state between the projections 45A and 46A and the holding groove 41 is released, and the connector member 31 is extracted from the port member 21. Each dimension from the convex portion of the lateral beam 47 to each of the projecting portions 45A and 46A is such that even if the convex portion of the lateral beam 47 is pressed toward the peripheral wall 22, the projecting portions 45A and 46A have corresponding end portions 42b and 43b. It is designed not to get over. Therefore, when the pressing force to the lateral beam 47 is lost, the protrusions 45A and 46A are substantially along the holding openings 42 and 43 due to the inclination toward the opening centers of the respective end portions 42b and 43b of the holding openings 42 and 43. Since it returns to the position shown in FIG. 3, the clip member 44 can be reused repeatedly. The same applies when the clip member 44 is inserted from the opposite side.
[0031]
As can be seen from FIG. 3, the pair of holding openings 42 and 43 are formed to be symmetric with respect to the central axis A of the clip member 44. Since both end portions 42a and 42b of the holding opening 42 are inclined toward the center of the opening, when the clip member 44 is attached to the peripheral wall 22, the protrusion 45A substantially follows the holding opening 42. Therefore, the attachment state becomes stable. Since the end portions 43a and 43b of the holding opening 43 are also inclined toward the center of the opening, as in the case of the holding opening 42, when the clip member 44 is attached to the peripheral wall 22, the protrusion 46A. Becomes substantially along the holding opening 43, so that the mounting state is stable. Further, when the leg portions 45 and 46 of the clip member 44 are passed through the holding openings 42 and 43, either end portion can be used, which has an advantage of good workability.
[0032]
FIG. 4 is a cross-sectional view of an essential part for explaining another embodiment of the present invention. The embodiment shown in FIG. 4 is the same as the embodiment shown in FIGS. 2 and 3 and the configuration of the holding opening for penetrating the pair of leg portions 45, 46 of the clip member 44 formed in the port member 21. Is only different. Therefore, the same reference numerals are given to the portions corresponding to the respective portions in FIG. 3 among the respective portions in FIG. 4 and the description thereof is omitted.
[0033]
Also in the embodiment shown in FIG. 4, the port member 21 is formed with a pair of holding openings 51 and 52 as described below. That is, the holding openings 51 and 52 are also formed symmetrically with respect to the central axis A, but the distance M between the one end portions 51a and 52a of the holding openings 51 and 52 is the other of the holding openings 51 and 52. The distance N is shorter than the distance N between the end portions 51b and 52b.
[0034]
As described above, since the predetermined length L is secured by changing the distance between the pair of holding openings 51 and 52 along the axial direction of the clip member, the protrusion 45A of the leg 45 is provided. A line P connecting the center point O1 of the arc of radius R forming the curved surface and the center point O2 of the arc of radius R forming the curved surface of the protrusion 46A of the leg 46 is the diameter of the peripheral surface 41A of the holding groove 41 It is deviated by a predetermined length L from the center O3. In the embodiment shown in FIGS. 2 and 3, the length L is zero. In other words, the line connecting the vertices 45Aa and 46Aa of the pair of protrusions 45A and 46A is shifted from the center O3 of the diameter of the peripheral surface 41A of the holding groove 41.
[0035]
Thus, by causing the shift of the length L, when the connector member 31 is sandwiched between the protrusion 45A and the protrusion 46A, the force for expanding the leg portions 45, 46 generated thereby is small. Therefore, when the connector member 31 is pushed into the port member 21, the protrusions 45A and 46A are held by the holding grooves 41 with a smaller force even in the case of the protrusions shown in FIGS. Can be enrolled in. Therefore, the labor of the worker at the time of assembly can be reduced, and workability can be greatly improved.
[0036]
FIG. 5 is a graph for explaining this quantitatively. According to the configuration shown in FIG. 4, the movement amount t of the leg portion 46 required when the leg portions 45 and 46 are engaged with the holding groove 41 is the same as in the case of FIG. 3. However, when the legs 45 and 46 are expanded, the spring force F against this is generated in the y direction, so F≈Kt (y)
It is. Here, the absolute value of t is greater than or equal to the absolute value of t (y). Therefore, it can be seen that the spring force F is smaller than that in the case of the configuration shown in FIG.
[0037]
FIG. 6 shows a main part of still another embodiment of the present invention. In this embodiment, the predetermined length L shown in FIG. 4 is obtained by changing the shape of the protrusion formed on the leg portion of the clip member 44. That is, the holding openings 51 and 52 are exactly the same as the embodiment shown in FIG. 3, but the shape of the protrusions 45B and 46B formed on the legs 45 and 46 is the same as that shown in FIG. It is different from the case in. That is, the relative positions of the vertices 45Ba and 46Ba of the protrusions 45B and 46B with respect to the connector member 31 are different. In the embodiment of FIG. 6, the line connecting the apex 46Ba of the protrusion 46B of the leg 46 and the apex 45Ba of the protrusion 45B of the leg 45 opposite thereto is the center of the diameter of the peripheral surface 41A of the holding groove 41. The shapes of the protrusions 45B and 46B formed on the leg portions 45 and 46 are determined so as to deviate from O3.
[0038]
The advantage of the configuration shown in FIG. 6 is that when the clip member 44 is attached to the port member 21, it may be from either end direction as in FIG. In the case of the configuration shown in FIG. 4, the attachment between the holding openings is from the shorter side.
[0039]
【The invention's effect】
According to the present invention, when the line connecting the centers of the circular arcs forming the curved surfaces of the pair of protrusions coincides with the center of the diameter of the circumferential surface of the holding groove, the clip member is stabilized as the first element. In addition to being able to be mounted, it is possible to easily penetrate the holding opening from either end of the holding opening, and the workability is good. In addition, when the line connecting the centers of the arcs forming the curved surfaces of the pair of protrusions deviates from the center of the diameter of the circumferential surface of the holding groove, the second element Can be reduced in force without expanding the leg of the clip member without damaging the coupling force, thereby reducing the labor of the operator during assembly. And the workability can be greatly improved.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a fuel injection system for an internal combustion engine including an element coupling device according to the present invention.
FIG. 2 is an exploded view showing a main part of an example of an embodiment of an injector device provided with an element coupling device according to the present invention.
3 is a cross-sectional view of the main part showing the main part of the element coupling device of FIG. 2 in cross section.
FIG. 4 is a cross-sectional view of an essential part of another embodiment of the present invention.
FIG. 5 is a graph for explaining the effect of the configuration shown in FIG. 4;
FIG. 6 is a cross-sectional view of a main part of another embodiment of the present invention.
FIG. 7 is a diagram showing an example of a conventional element coupling device.
8 is a front view of a back leak rail that is coupled to an injector by the element coupling device illustrated in FIG. 7;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Injector apparatus 2 Injector main body 3 Back leak rail 4 Element coupling apparatus 21 Port member 22 Perimeter wall 41 Holding groove 41A Inner peripheral surface 42, 43, 51, 52 Holding opening 44 Clip member 45, 46 Leg part 45A, 45B, 46A, 46B Projections 45Aa, 45Ba, 46Aa, 46Ba Vertex O1, O2, O3 Center R Radius

Claims (9)

In order to insert the second element into the sleeve-shaped first element and to arrange the first element and the second element coaxially with each other, a holding groove is formed on the outer periphery of the second element. Are provided on the peripheral wall of the first element so that the two holding openings that are aligned with each other and that are aligned with the holding groove are located opposite to each other. A pair of leg portions of a U-shaped clip member formed as a through-hole passes through, and the pair of leg portions are once expanded by pushing the second element into the first element, and then the holding is performed. An element coupling device in an injector for an internal combustion engine configured to achieve the required element coupling by engaging in a groove;
Each of the pair of legs is formed with an arc-shaped protrusion to be engaged with the holding groove, and a line connecting the centers of the arcs forming the curved surfaces of the protrusions of the pair of legs is The clip member is attached to the first element so as to be deviated by a predetermined length from the center of the diameter of the circumferential surface of the holding groove, and the protruding portion extends from the two holding openings to the second element. An element coupling device in an injector for an internal combustion engine, wherein the clip member is attached to the first element in a state of protruding inward. 2. The element coupling device in an injector for an internal combustion engine according to claim 1, wherein the predetermined length is secured by changing a distance between the pair of holding openings along an axial direction of the clip member . The element coupling device in an injector for an internal combustion engine according to claim 1 or 2, wherein the clip member is formed as a spring element made of an elastic steel wire . 4. The clip member according to claim 3, wherein the clip member is formed as a U-shaped member having the pair of legs, one end of which is joined by a transverse beam and the other end is expanded by bending the steel wire rod into a U-shape. An element coupling device in an injector for an internal combustion engine. The clip member is formed as a U-shaped member having the pair of legs with one end coupled by a transverse beam and the other end expanded by bending an elastic steel wire into a U-shape. 2. The element coupling device in an injector for an internal combustion engine according to claim 1, wherein the protrusion is formed on the leg by bending . 6. The element coupling device for an injector for an internal combustion engine according to claim 5, wherein a line connecting the vertices of the protrusions is deviated by a predetermined length from the center of the diameter of the circumferential surface of the holding groove . 6. The injector for an internal combustion engine according to claim 1, wherein a taper surface that is tapered toward the tip of the connector member is formed on a tip side of the holding groove on an outer periphery of the second element. Element coupling device. 2. The element coupling device for an injector for an internal combustion engine according to claim 1, wherein the first element is a port member for back flow of the injector. 2. The element coupling device in an injector for an internal combustion engine according to claim 1, wherein the second element is a back leak rail connector member .

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