FR3092441A1 - Resin molded body comprising a terminal conductor and a sealing fixing portion - Google Patents

Abstract

A resin molded product (1, 2) has a terminal conductor (10) extending in a first direction, a primary molded body (20) extending in the first direction along the terminal conductor (10), and a secondary molded body (30) covering the primary molded body (20), the secondary molded body (30) being made of resin. The primary molded body (20) has a protruding portion (22) extending in a second direction different from the first direction. The secondary molded body (30) has, on an outer surface of the secondary molded body (30), a sealing attachment portion (36) configured such that a sealing component (50) is attached to the sealing fixture (36), the sealing securing portion (36) covering the protruding portion (22). Figure for abstract: Figure 3A

Description

Resin molded body comprising a terminal conductor and a sealing fixing portion

The present invention relates to a resin molded product.

PRIOR ART

A prior art resin molded product is molded by a method such as injection molding using a mold. In general, this type of resin molded product tends to have a recess or similar (known as shrinkage) due to the molding shrinkage that occurs when the resin injected into the mold is cooled. According to the principle of molding shrinkage, the thicker the resin molded product is made, the greater a recess or the like (shrinkage) tends to become. Accordingly, this type of resin molded product usually has a hole (is hollowed out) to make the resin molded product thin-walled (see, for example, JPH07-106045A, JPH11-354192A, and JP2015-185420A ).

A connection domino electrically connects the interior and exterior of a box-shaped body such as a transmission and an engine for a vehicle in which a liquid such as a lubricating oil is charged. The connecting domino is fixed to the box-shaped body by being inserted into a mounting hole of the box-shaped body. The connecting domino usually has a sealing attachment portion (a gasket groove or the like) for a sealing component (a gasket or the like) which prevents leakage of lubricating oil or the like. In order to reliably seal the mounting hole of the box-shaped body, it is desirable that the sealing fixing portion has excellent dimensional accuracy as much as possible.

As a result, more holes (hollow portions) are generally provided near the sealing attachment portion than at other locations in the structure. At the same time, such holes can cause a reduction in the degree of design freedom of the connecting domino itself. Further, depending on the shape of the connecting domino, a mold having a complicated shape may have to be used to form the hole in the periphery of the seal fixing portion (a seal groove or the like) which can negatively affect the productivity of the login domino. Accordingly, it is often difficult to achieve both dimensional accuracy and productivity in the resin molded product having the sealing attachment portion to which the sealing component is to be attached.

Illustrative aspects of the present invention provide a resin molded product capable of achieving both dimensional accuracy and productivity while having a sealing attachment portion to which a sealing component is to be attached.

According to an illustrative aspect of the present invention, a resin molded product includes a terminal conductor extending in a first direction, a primary molded body extending in the first direction along the terminal conductor, and a secondary molded body covering the primary molded body, the secondary molded body being made of resin. The primary molded body has a protruding portion extending in a second direction different from the first direction. The secondary molded body has, on an outer surface of the secondary molded body, a sealing attachment portion configured such that a sealing component is attached to the sealing attachment portion, the sealing attachment portion sealing covering the protruding portion.

Other aspects and advantages of the invention will become apparent from the following description, drawings and claims.

is a perspective view showing a state in which a resin molded product according to an embodiment of the present invention is attached to a box-shaped body;

is a front view of the resin molded product of Fig. 1A (the box-shaped body is shown in section);

is a perspective view of the resin molded product viewed from above;

is a perspective view of the resin molded product seen from below;

is a cross-sectional view taken along line AA of Figure 2A;

is a perspective view of the primary molded body integrally formed with a terminal conductor;

is an enlarged view of a portion B of Figure 3A;

is a perspective view of a primary molded body integrally formed with a terminal conductor of a resin molded product according to a first reference example;

is a front view of the resin molded product;

is a cross-sectional view taken along a line CC in Figure 5B;

is an enlarged view of the periphery of a lower end portion of the primary molded body of Figure 6A;

is an enlarged front view of the periphery of the lower end portion of the primary molded body;

is a perspective view of a primary molded body integrally formed with a terminal conductor of a resin molded product according to a second reference example; and

corresponds to Figure 6B in the resin molded product.

Hereinafter, a resin molded product 1 according to an embodiment of the present invention will be described with reference to Figs. 1A to 4. The resin molded product 1 is typically used as a connection domino which electrically connects an interior and a exterior of a box-shaped body such as a transmission or an engine for a vehicle in which a liquid such as a lubricating oil is charged. As shown in Figs. 1A and 1B, the resin molded product 1 is to be attached to a box-shaped body 40 by being inserted into a mounting hole 41 (see Fig. 1B) provided on a wall of the box-shaped body. box 40.

Hereinafter, as shown in Fig. 1A, "front-rear direction", "width direction", "upper-lower direction", "front", "rear", "upper", and "lower" are defined. for a more convenient description. The "front-back direction", "width direction", and "top-bottom direction" are orthogonal to each other.

As shown in Figs. 1A to 4, the resin molded product 1 has a plurality (four in this example) of terminal conductors 10, a primary molded body 20 integrally formed with the plurality of terminal conductors 10, and a molded body secondary 30 formed integrally with the primary molded body 20. Hereinafter, members of the resin molded product 1 will be described in order.

Each terminal conductor 10 has a main body portion 11 extending linearly in the upper-lower direction, an upper end portion 12 curving from an upper end portion of the main body portion 11 and extending linearly toward a front side, and a lower end portion 13 curving from a lower end portion of the main body portion 11 and extending linearly toward a rear side.

The primary molded body 20 is generally a resin molded product integrated with the plurality of terminal conductors 10 by injection molding using a plurality of molds, so as to collectively cover a periphery of the main body portion 11 of the plurality of terminal conductors 10 arranged in a line extending in the width direction.

The primary molded body 20 integrally has a main body portion 21 and a protruding portion 22. The main body portion 21 is a substantially rectangular parallelepiped portion which extends in the upper-lower direction and collectively covers the main body portion 11 of the plurality of terminal conductors 10 except two end portions of the upper-lower direction in the main body portion 11. The protruding portion 22 extends backward from a lower part of a rear surface (a rectangular flat surface parallel to the upper-lower direction and the width direction) of the main body portion 21. With the protrusion portion 22 disposed in this manner, when the sub molded body 30 covers the primary mold 20 as shown in Fig. 3A, the protruding portion 22 is closer to a hood-shaped hood portion 35 than the center of the door. one of the main body 21 in the upper-lower direction. A distal end surface 23 (see Figs. 3B and 4) of the protruding portion 22 is curved to be arcuate (constituting part of a cylindrical surface).

The secondary molded body 30 is generally a resin molded product molded by injection molding using a plurality of molds, the secondary molded body 30 being for covering the primary molded body 20 which is integrated with the terminal conductors 10.

The secondary molded body 30 integrally comprises a main body portion 31, a cylindrical portion 32, a flange portion 33, an upper hood portion 34, and the lower hood portion 35. The main body portion 31 is a substantially rectangular parallelepiped which extends in the upper-lower direction and covers the main body portion 21 of the primary molded body 20 as well as two end portions in the upper-lower direction of the main body portion 11 of the plurality of terminal conductors 10.

The cylindrical portion 32 is a part which has a cylindrical shape and protrudes in a radial direction from the main body portion 31 to cover the entire protruding portion 22. The flange portion 33 is a part which is formed continuously on an upper side of the cylindrical portion 32 and protrudes from the main body portion 31, the flange portion 33 having a rectangular shape extending in the front-rear direction. and width direction. Lashing holes 33a passing through the flange portion 33 in the upper-lower direction are provided at the four corners of the flange portion 33, respectively.

The upper hood portion 34 is a portion extending as a rectangular hood from an upper end portion of the main body portion 31 toward the front side. Upper hood portion 34 surrounds upper end portion 12 of the plurality of terminal conductors 10 and allows upper end portion 12 to be exposed to an exterior. An adjustment opening 34a (see Figure 3A), which is an opening in the upper hood portion 34, functions as a location at which a mating post (not shown) is fitted to the end portion. 12 outside the box-shaped body 40. The lower hood portion 35 surrounds the lower end portion 13 of the plurality of terminal conductors 10 and allows the lower end portion 13 to be exposed to the 'outside. An adjustment opening 35a (see Figure 3A), which is an opening in the lower hood portion 35, functions as a location at which a mating post (not shown) is fitted to the end portion. bottom 13 inside the box-shaped body 40.

An annular groove 36 to which a sealing component 50 (see Figs. 1B and 2B) is to be attached is formed in a lower region of an outer peripheral surface of the cylindrical portion 32. Here, the thickness "a" ( see Fig. 4) of the cylindrical portion 32 (the secondary molded body 30) between the distal end surface 23 (the cylindrical surface) of the protruding portion 22 of the primary molded body 20 and a bottom surface 36a (see Fig. 4) of the annular groove 36 in the radial direction is uniform (substantially uniform) over an entire circumference of the distal end surface 23. Uniform thickness "a" means that thickness "a" is uniform within a range manufacturing errors (so-called manufacturing variations) that can occur during the molding of the secondary molded body 30. In other words, this means that the thickness "a" is designed to be uniform (for example, a numerical value of the thickness "a" shown in the drawing is uniform). In this example, the thickness "a" is less than or equal to 2 mm. Here, an outer peripheral portion of the cylindrical portion 32 on which the annular groove 36 is formed is an example of the "seal attachment portion".

In an upper region of the outer peripheral surface of the cylindrical portion 32, a plurality of lightening holes 37 recessed radially inward to prevent sink marks during molding are provided on the entire circumference. Further, an upward relief hole 38 for preventing sink marks during molding is provided at a position facing the main body portion 31 on a lower surface of the cylindrical portion 32 (i.e., a position opposite the protruding portion 22). The members of the resin molded product 1 are described above.

When the resin molded product 1 having the above configuration is fixed to the fixing hole 41 of the box-shaped body 40 shown in Fig. 1B, the resin molded product 1 (specifically, the cylindrical portion 32) in which the sealing component 50 is attached to the annular groove 36 is inserted into the mounting hole 41 of the box-shaped body 40 over it until the flange portion 33 abuts the outer surface of the box-shaped body 40. Next, the flange portion 33 is attached to the box-shaped body 40 through the tie-down holes 33a and tie-downs (not shown).

Therefore, the resin molded product 1 is fixed to the box-shaped body 40 in a state in which the sealing component 50 comes into contact with an inner peripheral surface of the mounting hole 41 for an entire circumference of the sealing component. sealing 50 and lubricating oil leakage inside the box-shaped body 40 is prevented. Thereafter, in the resin molded product 1 fixed to the box-shaped body 40, a terminal of upper coupling (not shown) is connected to adjustment aperture 34a of upper hood portion 34 and a lower coupling terminal (not shown) is connected to adjustment aperture 35a of lower hood portion 35, so that the inside and outside of the box-shaped body 40 are electrically connected.

As described above, the resin molded product 1 according to the embodiment of the present invention has the primary molded body 20 extending along the main body portion 11 of the terminal conductors 10 (the primary molded body 20 extending in a first direction) and the secondary molded body 30 covering the primary molded body 20. The protruding portion 22 extends from the primary molded body 20 in a direction different from a direction in which the main body portion 11 terminal conductors 10 extends (the protruding portion 22 extending in a second direction which is different from the first direction), and the annular groove 36 of the secondary molded body 30 to which the sealing component 50 is to be attached, the annular groove 36 configured to cover the protruding portion 22 is formed. Therefore, the thickness of a bottom wall of the annular groove 36 is small compared to a case where no protruding portion 22 of the primary molded body 20 is provided. Namely, it is possible to thin the bottom wall of the annular groove 36 without providing a hole in a periphery of an annular groove as in the related art.

The protruding portion 22 extends away from the main body portion 21 of the primary molded body 20, the main body portion 21 extending along the main body portion 11 of the terminal conductors 10. Accordingly, the function of holding the terminal conductors 10 by the primary molded body 20 is not affected. Accordingly, the productivity of the resin molded product 1 can be improved compared to a case where a hole is formed in the periphery of the annular groove 36 while improving the dimensional accuracy of the annular groove 36. Therefore, the resin molded product Resin 1 having the present configuration can achieve both dimensional accuracy and productivity while providing the annular groove 36 for assembly of the sealing component 50.

Terminal fitting apertures 34a, 35a (hood-shaped hood portions 34, 35) for connection of terminal conductors 10 to a mating terminal or the like extend in the direction in which protruding portion 22 of the primary molded body 20 extends. Consequently, if a hole is made in the periphery of the annular groove as in the related art, the hood portions 34, 35 are likely to interfere with the arrangement of a mold (so-called slide mold) for lightening compared to a case where a hood portion having a hood shape extends in a direction different from a direction in which the protruding portion extends. However, in the resin molded product 1 having the present configuration, the relief may not be required at all by virtue of the protrusion portion 22 of the primary molded body 20. Therefore, the degree of freedom in design of the hood portions 34, 35 is improved.

The distal end surface 23 of the protruding portion 22 of the primary molded body 20 has a shape created along a shape of the annular groove 36 of the secondary molded body 30. Therefore, the dimensional accuracy of the annular groove 36 can be further improved because the protruding portion 22 also functions as a core member which supports and maintains the shape of the annular groove 36.

The thickness "a" (see Figure 4) between the distal end surface 23 of the protruding portion 22 of the primary molded body 20 and the bottom surface 36a of the annular groove 36 is substantially uniform and is less than or equal to 2mm. According to the study by the inventors, in a resin material generally used as the material of the resin molded product 1, deformation (shrinkage) due to molding shrinkage can be substantially ignored in design as long as the resin molded product is thinned. so that its substantial thickness is reduced to a value less than or equal to 2 mm. Accordingly, the sealing performance of the resin molded product 1 can be further improved with such a thickness "a" of the bottom wall of the annular groove 36 which particularly affects the sealing performance of the sealing component 50. .

While the present invention has been described with reference to certain exemplary embodiments thereof, the scope of the present invention is not limited to the exemplary embodiments described above, and those skilled in the art It will be understood that various changes and modifications may be made therein without departing from the scope of the present invention as defined by the appended claims.

For example, in the resin molded product 1 according to the above embodiment, the terminal fitting openings 34a, 35a (the hood portions 34, 35) for connection of the terminal conductors 10 to a terminal of coupling or the like extend along the direction in which the protruding portion 22 of the primary molded body 20 extends. In contrast, adjustment openings 34a, 35a (hood portions 34, 35) may extend in a direction different from the direction in which protruding portion 22 of primary molded body 20 extends.

A resin molded product 2 according to a first reference example will be described below with reference to Figs. 5A to 6C. The resin molded product 2 according to the first reference example is different from the resin molded product 1 according to the above embodiment in that: no lower end portion 13 is formed in the terminal conductors 10 ( that is, a lower end portion of the main body portion 11 coincides with a lower end portion of the terminal conductors 10); no protruding portion 22 is provided in the primary molded body 20; no lower hood portion 35 exists in the secondary molded body 30; and a lower end portion of the main body portion 21 of the primary molded body 20 (and a lower end portion of the main body portion 11 of the terminal conductors 10) projects downward from an end surface bottom of the cylindrical portion 32 of the secondary molded body 30.

In the resin molded product 2 shown in Figs. 5A to 6C, the same or equivalent configurations as those of the resin molded product 1 according to the above embodiment are designated by the same reference numerals as those used in the molded product in resin 1, and their descriptions will be omitted.

In the manufacturing process of the resin molded product 2, when the sub molded body 30 is injection molded, the resin material needs to be injected from a gate provided at a predetermined location of a mold for sub molding in a state in which the primary molded body 20 is fixed so as not to move relative to the mold.

Here, in order to fix the primary molded body 20 to the mold for secondary molding, as in a second reference example shown in Fig. 7B, a method is considered in which an annular collar portion 24 is formed on an outer peripheral surface of a lower end portion of the main body portion 21 of the primary molded body 20, the main body portion 21 protruding downward from a lower end surface of the secondary molded body 30 (the cylindrical portion 32) and a dedicated mold must be pressed against collar portion 24 from forward, backward, upper, lower, left, and right directions (see white arrows shown in Fig. 7B), thereby restricting movement of primary molded body 20.

In contrast, no collar portion is provided in the resin molded product 2 shown in Figs. 5A to 6C. In the manufacturing process of the resin molded product 2, a dedicated mold is to be pressed against the lower end portion of the main body portion 21 of the primary molded body 20, with the main body portion 21 protruding downward from the lower end surface of the secondary molded body 30 (the cylindrical portion 32) from front, rear, lower, left, and right directions other than the upper direction (see the white arrows shown in Figs. 6B and 6C), and the Resin material is injected from a gate provided at an upper end position of the secondary molding mold to the primary molded body 20 positioned below the gate.

Therefore, the primary molded body 20 must be pressed down due to the injection pressure, so that the upward movement of the primary molded body 20 can be restricted. That is, by employing injection pressure, a dedicated mold configured to press the primary molded body 20 thereon can be omitted compared to the second reference example shown in Fig. 7B.

According to the exemplary embodiments described above, a resin molded product (1) has a terminal conductor (10) extending in a first direction, a primary molded body (20) extending in the first direction along the terminal conductor (10) and a secondary molded body (30) covering the primary molded body (20), the secondary molded body (30) being made of resin. The primary molded body (20) has a protruding portion (22) extending in a second direction different from the first direction. The secondary molded body (30) has, on an outer surface of the secondary molded body (30), a sealing attachment portion (36) configured such that a sealing component (50) is attached to the sealing attachment (36), the sealing attachment portion (36) covering the protruding portion (22).

The resin molded product in the above configuration has the primary molded body extending along the terminal conductor and the secondary molded body which covers the primary molded body. Further, the protruding portion extends from the primary molded body in a direction (a first direction) different from a direction in which the terminal conductor extends (a second direction), and the sealing fixing portion (eg, a seal groove) of the secondary molded body to which the sealing component (eg, a gasket) is to be fixed, the seal fixing portion being configured to cover the protruding portion is formed. Therefore, the thickness of the secondary molded body having the sealing attachment portion is reduced compared to a case where no protruding portion of the primary molded body is provided. That is, it is possible to thin the sealing attachment portion without providing a hole in a periphery of a sealing attachment portion as in the related art. The protruding portion extends away from a portion (i.e., the main body portion of the primary molded body) extending along the terminal conductor. Therefore, a holding function of the terminal conductor by the primary molded body is not affected. Accordingly, the productivity of the resin molded product can be improved compared to a case where a hole is formed in the periphery of the sealing attachment portion while improving the dimensional accuracy of the sealing attachment portion. Accordingly, the resin molded product having the present configuration can achieve both dimensional accuracy and productivity while having the sealing attachment portion for assembling the sealing component.

The resin molded product (1) may further comprise the secondary molded body (30) which has a hood-shaped hood portion (34, 35) surrounding an end portion (12, 13) of the terminal conductor ( 10) such that the end portion (12, 13) is exposed to an exterior of the secondary molded body (30). The hood portion (34, 35) may extend along the second direction.

According to the resin molded product in the above configuration, the terminal fitting opening (the hood-shaped portion) for connection of the terminal conductor to a mating terminal or the like extends along the direction in which the protruding portion of the primary molded body extends. Since the hood-shaped hood portion is arranged in this way, if a hole is formed in the periphery of the sealing fixing portion as in the related art, the hood portion is liable to interfere with the arrangement of a mold (mould said on slide) to make the hole. However, in the resin molded product having the present configuration, the hole may not be required at all by virtue of the protrusion portion of the primary molded body. Accordingly, in the resin molded product having the present configuration, the hood-shaped hood portions can be arranged as described above without unduly complicating the mold design. In other words, the degree of design freedom of the arrangement of the hood-shaped hood portion and the like is improved.

The resin molded product having the present configuration can particularly contribute to improving the degree of design freedom of the hood portion when the terminal adjustment opening (e.g., the hood-shaped hood portion) is formed in adjacent to the protruding portion of the primary molded body or is provided adjacent to the protruding portion of the primary molded body. Here "neighborhood" and "adjacent" mean that a distance between the hood-shaped hood portion and the sealing fixing portion is so short that the mold (a slide mold or the like) for thinning may interfere with the hood-shaped hood portion (the adjustment opening).

The resin molded product (1) may further comprise at least a part of a distal end surface (23) of the protrusion portion (22) of the primary molded body (20) which has a shape corresponding to a shape of an outer surface of the sealing attachment portion (36) of the secondary molded body (30).

According to the resin molded product in the above configuration, at least a part of the end surface of the end of the protrusion portion of the primary molded body has a shape corresponding to the shape of the sealing attachment portion of the secondary molded body. Therefore, the dimensional accuracy of the seal attachment portion (e.g., a seal groove) can be further improved since the protruding portion also functions as a core member that supports and maintains the shape of the seal portion. sealing attachment.

Further, the resin molded product (1) may further have the sealing attachment portion (36) of the secondary molded body (30) which has a recessed groove toward the distal end surface of the protrusion portion ( 22). A thickness (a) of the secondary molded body (30) between a bottom surface (36a) of the groove and the distal end surface (23) of the protruding portion (22) can be uniform over an entire surface of distal end (23). The thickness (a) can be less than or equal to 2 mm.

Claims (6)

Resin molded product (1, 2) comprising:
a terminal conductor (10) extending in a first direction;
a primary molded body (20) extending in the first direction along the terminal conductor (10); and
a secondary molded body (30) covering the primary molded body (20), the secondary molded body (30) being made of resin,
wherein the primary molded body (20) includes a protruding portion (22) extending in a second direction different from the first direction, and
wherein the secondary molded body (30) includes, on an outer surface of the secondary molded body (30), a sealing attaching portion (36) configured such that a sealing component (50) is attached to the sealing attachment portion (36), the sealing attachment portion (36) covering the protruding portion (22). A resin molded product (1, 2) according to claim 1,
wherein the secondary molded body (30) includes a hood portion (34, 35) surrounding an end portion (12, 13) of the terminal conductor (10) such that the end portion (12, 13) is exposed to an exterior of the secondary molded body (30), and
wherein the hood portion (34, 35) extends along the second direction. Resin molded product (1, 2) according to claim 1 or 2,
wherein at least a part of a distal end surface (23) of the protruding portion (22) of the primary molded body (20) has a shape corresponding to a shape of an outer surface of the attachment portion of sealing (36) of the secondary molded body (30). A resin molded product (1, 2) according to any one of claims 1 to 3,
wherein the sealing attachment portion (36) of the secondary molded body includes a recessed groove toward the distal end surface (23) of the protruding portion (22). A resin molded product (1, 2) according to claim 4,
wherein a thickness of the secondary molded body (30) between a bottom surface of the groove and the distal end surface (23) of the protruding portion (22) is uniform over an entire distal end surface (23 ). A resin molded product (1, 2) according to claim 5,
wherein the thickness is less than or equal to 2 mm.