JP7200020B2 - INSERT COLLAR AND METHOD FOR MANUFACTURING RESIN MOLDED PRODUCT INCLUDING THE SAME - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to an insert collar and a method of manufacturing a resin molded product having the same.

2. Description of the Related Art Conventionally, as a resin molded product that is attached to a mating member such as a metal member using a bolt, a resin molded product provided with a metal cylindrical insert collar has been known. The insert collar is incorporated in a through-hole formed in the attachment portion to the mating member. The resin molded product is attached to the mating member by inserting the bolt through the insert collar and fastening the bolt to the attached portion of the mating member. An example of such a resin molded product is disclosed in Patent Document 1.

JP-A-2004-042561

When insert-molding the insert collar integrally with the resin-molded product described above, if there is a gap between the open end of the insert collar and the molding die due to a dimensional error, the resin flows into the gap and the open end of the insert collar. The resin portion may be formed on the end face of the . If the resin portion formed on the end face of the insert collar extends to contact points with other members such as the bearing surface of the bolt and the contact surface with the mating member, the stress generated when the bolt is tightened will cause Inconveniences such as cracking of resin molded products and loosening of bolts are caused.

The technique of the present disclosure has been made in view of such a point, and the purpose thereof is to prevent formation of a resin portion at a contact portion with another member on the end surface of the open end of the insert collar. That's what it is.

In order to achieve the above object, in the technique of the present disclosure, in the insert molding of a resin molded product, the insert collar is designed so that the resin that has entered the end surface of the open end of the insert collar does not reach the seating surface of the fastening member. Improved the configuration. In addition, in the technique of the present disclosure, a method for manufacturing a resin molded product is devised so that a resin portion is not formed on the end face of the open end of the insert collar.

A first aspect of the technology of the present disclosure is directed to a tubular insert collar with both ends opened, which is used for insert molding of a resin molded product. The insert collar of this first aspect has a flange on at least one open end. The flange is provided with a groove-shaped recess that is open in the opening direction of one open end having the flange over the entire circumference. A portion of the flange on the inner peripheral side of the groove-shaped recess forms a seating surface for the fastening member.

A second aspect according to the technology of the present disclosure is an insert collar in which, in the insert collar of the first aspect, the groove-shaped concave portion is formed in an annular shape.

A third aspect of the technique of the present disclosure is the insert collar according to the second aspect, wherein the portion of the flange provided with the groove-shaped recess has a flexible portion that is more easily bent than the portion that forms the seating surface of the flange. It is an insert collar that makes up. In the insert collar of the third aspect, an annular ridge projecting from the seating surface in the opening direction of the open end having the flange is provided on the outer peripheral side of the groove-shaped concave portion of the flange.

A fourth aspect of the technology of the present disclosure is directed to a method of manufacturing a resin molded product integrally formed with a cylindrical insert collar that is open at both ends and has a flange at one open end. In the method for manufacturing a resin molded product according to the fourth aspect, a cap member for closing the opening of the insert collar is attached to the open end on the other side of the insert collar. After that, of the first mold and the second mold for molding the resin molded product, the insert collar is set to the first mold so that the flange abuts against the first mold. do. Furthermore, by closing the first mold with the insert collar set thereon and the second mold in such a manner that the cap member attached to the insert collar abuts against the second mold, the first molding is performed. A cavity is formed between the mold and the second mold. Then, by filling the cavity with molten resin and curing it, the resin molded product is molded, the first mold and the second mold are opened, and the resin molded product is taken out. Afterwards, the cap member is removed from the insert collar.

A fifth aspect of the technology of the present disclosure is the method of manufacturing a resin molded product according to the fourth aspect, wherein the second mold is biased in a mold closing direction with respect to the first mold and pushed back. A method of manufacturing a resin molded product using a mold in which a rod member slidable in a backward direction when pressed is provided at a portion corresponding to an insert collar. In the method for manufacturing a resin molded product according to the fifth aspect, the rod member is brought into contact with the cap member attached to the insert collar while the first mold and the second mold are being closed. The mold is closed while retracting the rod member. Then, with the first mold and the second mold closed, the rod member presses and holds the insert collar against the first mold.

According to a sixth aspect of the technology of the present disclosure, in the method for manufacturing a resin molded product according to the fifth aspect, the cap member is provided with an extending portion extending radially outward from the open end on the other side of the insert collar. It is a method for manufacturing a resin molded product using the cap member. In the method of manufacturing a resin molded product according to the sixth aspect, in the process of retracting the rod member, the tip of the extending portion of the cap member is brought into contact with the molding surface of the second molding die, so that the outer circumference of the insert collar is When the cap member is removed from the resin molding by pushing it toward the flange side, the open end on the other side of the insert collar is exposed in a state of protruding from the resin part molded on the outer periphery of the insert collar.

According to the insert collar of the first aspect, when the resin molded product is insert-molded, the flange of the insert collar is brought into contact with the molding die, thereby reducing the pressure of the resin trying to enter between the flange and the molding die. Since it is weakened by the side wall on the outer peripheral side of the groove-shaped recess in the flange, the amount of resin that enters between them can be reduced. In addition, since the resin that has entered between the flange of the insert collar and the molding die accumulates in the groove-shaped concave portion, it does not reach the seating surface of the flange. Accordingly, it is possible to prevent formation of a resin portion on the seating surface of the fastening member in the flange of the insert collar.

According to the insert collar of the second aspect, it is possible to realize the insert collar of the first aspect with a relatively small diameter flange.

According to the insert collar of the third aspect, in the process of closing the mold during insert molding of a resin molded product, the convex portion is preferentially interfered with the mold, and the flange is flexurally deformed by the flexible portion. This makes it possible to allow dimensional errors between the insert collar and the mold. In addition, since the flange of the insert collar is easily bent at the flexible portion, the extra load applied to the molding die can be reduced, and the molding die is less likely to be adversely affected even if the number of molding times (the number of shots) is repeated.

According to the method for manufacturing a resin molded product of the fourth aspect, when the resin molded product is insert-molded, the end surface of the open end of the insert collar is covered with the cap member, so that the end surface of the open end of the insert collar does not interfere with other members. It is possible to prevent formation of a resin portion at a contact portion (for example, a contact portion with a mating member to which the resin molded product is attached).

According to the method of manufacturing a resin molded product of the fifth aspect, the stroke (sliding amount) of the rod member from the mold open state to the mold closed state can be changed according to the length of the insert collar. Dimensional error in the length direction can be allowed.

According to the method for manufacturing a resin molded product of the sixth aspect, during the insert molding of the resin molded product, the extending portion of the cap member is pressed against the molding surface of the second molding die while being bent toward the flange side. Therefore, the space between the extension of the cap member and the second mold is preferably sealed. In addition, by bending the extending portion of the cap member toward the flange side, the resin portion formed around the open end of the insert collar is scraped away, and the end face of the open end on the other side of the insert collar is preferably removed from the resin portion. can be exposed.

1 is a partial perspective view of an oil pan according to an embodiment; FIG. 2 is a plan view of a portion of the oil pan enclosed by II in FIG. 1. FIG. FIG. 3 is a back view of a portion corresponding to FIG. 2 of the oil pan according to the embodiment. 4 is a cross-sectional view of part of the oil pan taken along line IV-IV of FIG. 2. FIG. FIG. 5 is a cross-sectional view showing a fastening state of the oil pan according to the embodiment at a portion corresponding to FIG. 4 and the cylinder block. FIG. 6 is a perspective view showing how the cap member is attached to the insert collar in the oil pan manufacturing method according to the embodiment. FIG. 7 is a cross-sectional view showing how the mold is closed in the oil pan manufacturing method according to the embodiment. FIG. 8 is a cross-sectional view showing how the mold is closed in the oil pan manufacturing method according to the embodiment. FIG. 9 is a cross-sectional view showing a state in which the mold is closed and the cavity is filled with resin in the oil pan manufacturing method according to the embodiment. FIG. 10 is a cross-sectional view showing a state in which the mold is closed and the cavity is filled with resin in the oil pan manufacturing method according to the embodiment. FIG. 11 is a cross-sectional view showing how the mold is opened and the oil pan is demolded from the core mold in the oil pan manufacturing method according to the embodiment. FIG. 12 is a cross-sectional view of an insert collar according to a modification. FIG. 13 is a cross-sectional view showing how the mold is closed in the oil pan manufacturing method according to the modification. FIG. 14 is a cross-sectional view showing a state in which the mold is closed in the oil pan manufacturing method according to the modification.

Exemplary embodiments are described in detail below on the basis of the drawings.

In this embodiment, an insert collar according to the technology of the present disclosure and a resin molded article including the insert collar will be described by taking an oil pan as an example.

FIG. 1 is a partial perspective view of an oil pan 1 according to this embodiment. FIG. 2 is a plan view of a portion of the oil pan 1 surrounded by II in FIG. FIG. 3 is a rear view of a portion of the oil pan 1 corresponding to FIG. FIG. 4 is a cross-sectional view of part of the oil pan 1 taken along line IV-IV of FIG. FIG. 5 is a cross-sectional view showing a fastening state with the cylinder block 101 at a portion corresponding to FIG. 3 of the oil pan 1. As shown in FIG.

An oil pan 1 shown in FIG. 1 is a molded product made of synthetic resin, and is an example of a resin molded product according to the technology of the present disclosure. The oil pan 1 is a cover attached to the lower portion of a cylinder block 101 of the engine, and stores lubricating oil to be circulated inside the engine. The oil pan 1 includes a cup portion 3 for storing lubricating oil, and an outer peripheral mounting portion 5 extending from an upper end opening of the cup portion 3 to the outer peripheral side.

As shown in FIGS. 2 to 4, a plurality of through holes 7 are formed in the outer peripheral mounting portion 5 of the oil pan 1. As shown in FIGS. The plurality of through holes 7 are arranged at intervals in the circumferential direction of the outer peripheral mounting portion 5 . Each through hole 7 is provided with a cylindrical insert collar 9 (hatched in FIG. 1) with both ends open. The oil pan 1, as shown in FIG. fastened and fixed.

The insert collar 9 is integrated with the oil pan 1 by insert molding. The insert collar 9 is made of, for example, a metal material such as iron-based metal. The insert collar 9 is provided with a bolt insertion hole 11 that communicates with both end openings. A bolt 103 for fastening the oil pan 1 to the cylinder block 101 is inserted into the bolt insertion hole 11 of the insert collar 9 with a spring washer 104 for preventing loosening.

The insert collar 9 includes a cylindrical tubular portion 13 having a bolt insertion hole 11, and an annular flange 15 extending outward from a first open end 13a on one side of the tubular portion 13. .

A flange 15 of the insert collar 9 is formed with one annular groove-shaped recess 17 . The groove-shaped recess 17 is formed on the outer peripheral side of the flange 15 of the insert collar 9 . A portion of the flange 15 of the insert collar 9 inside the groove-shaped recess 17 forms a seating surface 19 on which the head of the bolt 103 is seated via the spring washer 104 . A portion of the flange 15 on the outer peripheral side of the groove-shaped concave portion 17 constitutes an outer peripheral wall 21 .

In this embodiment, the seating surface 19 of the insert collar 9 and the end surface of the outer peripheral wall 21 are set at the same height position in the longitudinal direction of the tubular portion 13 .

The insert collar 9 has a first opening end 13a provided with a flange 15 facing the rear side of the outer peripheral mounting portion 5 of the oil pan 1, and a second opening end 13b not provided with the flange 15 facing the oil pan 1. It is provided in the oil pan 1 in a posture facing the front side of the outer peripheral mounting portion 5 of the. The outer surface of the insert collar 9 excluding the end surfaces of both open ends 13 a and 13 b , that is, the outer peripheral surface of the cylindrical portion 13 and the back and outer peripheral surfaces of the flange 15 are covered with the resin portion 25 of the oil pan 1 .

On the surface of the resin portion 25 of the outer peripheral attachment portion 5 of the oil pan 1 , a sealing recess 27 extending like a groove is formed over the entire circumference of the outer peripheral attachment portion 5 . A sealing recess 27 surrounds the outer circumference of the second open end 13b of each insert collar 9 . A rubber sealing member 29 is fitted in the sealing recess 27 . The seal member 29 is compressed to seal the space between the oil pan 1 and the cylinder block 101 when the oil pan 1 is fastened to the cylinder block 101 .

A method of manufacturing the oil pan 1 having the above configuration will be described below with reference to FIGS. 6 to 11. FIG.

6 is a perspective view showing how the cap member 51 is attached to the insert collar 9. FIG. 7 and 8 are sectional views showing how the mold 201 is closed. 9 and 10 are cross-sectional views showing a state in which the mold 201 is closed and the cavity 225 is filled with the resin R in a molten state. FIG. 11 is a cross-sectional view showing how the mold 201 is opened and the oil pan 1 is demolded from the core mold 205 in the method of manufacturing the oil pan 1 .

In order to manufacture the oil pan 1, first, a plurality of insert collars 9 are prepared, and as shown in FIG. A cap member 51 for closing the opening of the collar 9 is attached. The cap member 51 is made of a rubber material such as silicone rubber. The cap member 51 includes a columnar insertion portion 53 to be inserted into the insert collar 9 (cylindrical portion 13), and an annular flange 55 extending from one end of the insertion portion 53 to the outer peripheral side.

The flange 55 of the cap member 51 is attached to the insert collar 9 by inserting the inserting portion 53 into the opening on one side of the cylindrical portion 13 , and the flange 55 of the cap member 51 extends toward the second open end 13 b of the insert collar 9 . cover the entire end face of the (see FIG. 7). The flange 55 of the cap member 51 is provided with an extending portion 57 extending radially outward from the open end 13b of the insert collar 9. As shown in FIG. This extending portion 57 is formed by the outer peripheral portion of the flange 55 of the cap member 51 .

Next, as shown in FIG. 7 , a plurality of insert collars 9 each having a cap member 51 attached thereto are set in a mold 201 for molding the oil pan 1 . The molding die 201 includes a cavity die 203 and a core die 205 that are arranged to face each other, and the cavity die 203 and the core die 205 are configured to be openable and closable. The cavity mold 203 is an example of a first mold. The core mold 205 is an example of a second mold.

The cavity mold 203 is a fixed mold and has a first molding surface 207 for molding the back surface of the oil pan 1 (mainly the outside of the oil pan 1). The cavity mold 203 is provided with a plurality of cylindrical positioning protrusions 209 projecting toward the core mold 205 . On the other hand, the core die 205 is a movable die and has a second molding surface 211 for molding the surface of the oil pan 1 (mainly the inside of the oil pan 1). The core die 205 is provided with a plurality of receiving holes 213 for receiving both the positioning protrusions 209 of the cavity die 203 and the insert collars 9 set on the positioning protrusions 209 .

The core mold 205 further includes a rod member 215 which is slidable in the receiving hole 213 in the forward direction in the mold closing direction with the cavity mold 203 and in the backward direction in the mold opening direction with the cavity mold 203 . It is provided at a site corresponding to the insert collar 9 set in the . The rear end of the rod member 215 is attached to a base plate 217 that slides along with the rod member 215 inside the core mold 205 . The rod member 215 is biased forward by a spring 219 via the base plate 217, and is pushed back against the biasing force of the spring 219, thereby sliding backward.

In this core die 205, a stopper 221 is provided around the spring 219 to receive the base plate 217 at a predetermined retraction position when the rod member 215 slides in the retraction direction. Further, the core die 205 is provided with an ejector pin 223 through which the spring 219 is inserted. The ejector pin 223 operates to push out the rod member 215 forward through the base plate 217 at the timing of removing the oil pan 1 formed by the mold 201 .

Of the cavity mold 203 and the core mold 205 that make up the molding die 201 , each insert collar 9 is set in the cavity mold 203 by fitting the positioning projections 209 into the bolt insertion holes 11 . At this time, the surface of the flange 15 of the insert collar 9, specifically, the end surface of the outer peripheral wall 21 and the seating surface 19 are brought into contact with the cavity mold 203. As shown in FIG.

Next, the cavity mold 203 in which the insert collar 9 is set and the core mold 205 are closed. Thereby, a cavity 225 (molding space) is formed between the first molding surface 207 of the cavity mold 203 and the second molding surface 211 of the core mold 205 . At this time, the cap member 51 attached to the insert collar 9 is brought into contact with the front end surface of the rod member 215 within the receiving hole 213 of the core die 205 .

As shown in FIG. 8, the molding die 201 brings the rod member 215 into contact with the cap member 51 attached to the insert collar 9 while the cavity die 203 and the core die 205 are being closed. is retracted relative to the core mold 205 against the biasing force of the spring 219, the mold is closed. At this time, in the process of retracting the rod member 215, the tip of the extending portion 57 of the cap member 51 is placed on the second molding surface 211 of the core mold 205, which is the molding surface 211 for molding the bottom surface of the sealing recess 27 in this embodiment. to press the outer periphery of the insert collar 9 toward the flange 15 side. When the cavity mold 203 and the core mold 205 are closed, the rod member 215 presses and holds the insert collar 9 against the cavity mold 203 .

Next, as shown in FIG. 9, the cavity 225 is filled with molten resin R through a gate (not shown). At this time, as shown in FIG. 10, the extending portion 57 of the cap member 51 is pressed against the second molding surface 211 of the core mold 205 while being bent toward the flange 15 side of the insert collar 9. The space between the extending portion 57 of the cap member 51 and the core mold 205 is sealed. Also, the bent extending portion 57 of the cap member 51 causes the cavity 225 formed around the second open end 13b of the insert collar 9 to be reduced.

After filling the entire cavity 225 with the resin R, the mold 201 is cooled to harden the resin R filled in the cavity 225, whereby the oil pan 1 is molded. Thereafter, the mold 201 is opened by separating the cavity mold 203 and the core mold 205, and as shown in FIG. The oil pan 1 is pushed out and removed from the mold 201. - 特許庁

Then, the cap member 51 is removed from each insert collar 9 of the oil pan 1 that has been demolded. As a result, the second open end 13b to which the cap member 51 of the insert collar 9 is attached is exposed in a state of protruding from the resin portion 25 formed on the outer periphery of the insert collar 9. As shown in FIG. Finally, the gate residue and other unnecessary pieces attached to the oil pan 1 are removed.

As described above, the oil pan 1 in which a plurality of insert collars 9 are integrated can be manufactured.

In the insert collar 9 of this embodiment, a flange 15 provided at the first open end 13a is provided with a groove-shaped concave portion 17 along the entire circumference. The groove-shaped concave portion 17 is opened in the opening direction of the first open end 13 a and is arranged on the outer periphery of the seating surface 19 of the bolt 103 of the flange 15 . According to such a configuration, when the oil pan 1 is insert-molded, the flange 15 of the insert collar 9 is brought into contact with the cavity mold 203, so that the pressure of the resin R that tries to enter between the flange 15 and the cavity mold 203 is reduced. is weakened by the outer peripheral wall 21 of the flange 15, the amount of resin R entering between them can be reduced. Also, the resin R that has entered between the flange 15 of the insert collar 9 and the cavity 203 accumulates in the groove-shaped recess 17 and does not reach the seating surface 19 of the flange 15 . Thereby, it is possible to prevent the formation of the resin portion 25 on the seating surface 19 of the bolt 203 in the flange 15 of the insert collar 9 .

Further, in the insert collar 9 of this embodiment, the groove-like recessed portion 17 is formed in an annular shape. With such a configuration, it is possible to realize the insert collar 9 that exhibits the above effects with the flange 15 having a relatively small diameter.

Further, in the method of manufacturing the oil pan 1 of this embodiment, the cap member 51 is attached to the second open end 13b of the insert collar 9, and the first open end 13a of the insert collar 9 on the side to which the cap member 51 is not attached. The flange 15 provided in the body is brought into contact with the cavity mold 203, the cap member 51 is brought into contact with the core mold 205, and the oil pan 1 is insert-molded by the cavity mold 203 and the core mold 205. After that, the mold is removed. Then, the cap member 51 is removed from the oil pan 1. According to this method, when the oil pan 1 is insert-molded, the second open end 13b of the insert collar 9 is covered with the cap member 51, so that the end surface of the second open end 13b of the insert collar 9 is not exposed to the cylinder block. It is possible to prevent the formation of the resin portion 25 at the contact portion with the 101 .

Further, in the method for manufacturing the oil pan 1 of this embodiment, the rod member 215 is brought into contact with the cap member 51 attached to the insert collar 9 while the cavity mold 203 and the core mold 205 are being closed. The mold is closed while retracting the mold 215 . With the mold 203 and the core mold 205 closed, the rod member 215 presses and holds the insert collar 9 against the mold 203 . According to such a method, since the stroke (sliding amount) of the rod member 215 from the mold open state to the mold closed state can be changed according to the length of the insert collar 9, the length direction of the insert collar 9 can be changed. Dimensional errors in can be allowed.

Further, in the method of manufacturing the oil pan 1 of this embodiment, in the process of retracting the rod member 215, the tip of the extension portion 57 of the cap member 51 is placed on the second molding surface 211 of the core mold 205 (the sealing recess portion 27). When the cap member 51 is removed from the oil pan 1 after molding, the outer periphery of the insert collar 9 is pushed into the flange 15 side by bringing the bottom surface into contact with the molding surface 211) that molds the insert collar 9. 2 is exposed in a state of protruding from a resin portion 25 molded on the outer periphery of the insert collar 9. As shown in FIG. According to such a method, the end face of the second open end 13b of the insert collar 9 can be exposed from the resin portion 25 in a suitable manner.

- Modification of Embodiment -
FIG. 12 is a cross-sectional view of the insert collar 9 of the oil pan 1 according to this modification.

In the insert collar 9 used in the oil pan 1 of the above embodiment, the end surface of the outer peripheral wall 21 of the flange 15 and the seating surface 19 of the bolt 103 are set at the same height position in the longitudinal direction of the cylindrical portion 13. However, as shown in FIG. 12 , in the insert collar 9 used in the oil pan 1 according to this modified example, the end surface of the outer peripheral wall 21 of the flange 15 is closer to the tubular portion 13 than the seating surface 19 of the bolt 103 . It is located on the side facing the opening of the first opening end 13a in the length direction.

The outer peripheral wall 21 of the flange 15 of the insert collar 9 forms an annular projection 31 projecting from the seating surface 19 in the opening direction of the first opening end 13a. The protruding portion 31 is provided over the entire periphery of the flange 15 so as to surround the seating surface 19 on the outer periphery of the groove-shaped recessed portion 17 . The height H of the ridge portion 31 is set to, for example, 0.2 mm or more and 0.5 mm or less. In the flange 15 of the insert collar 9, the portion where the groove-shaped recess 17 is formed is thinner than the portion forming the seating surface 19 and the outer peripheral wall 21, and is more flexible than the portion forming the seating surface 19. It constitutes a flexible portion 23 that is easy to handle.

FIG. 13 is a cross-sectional view showing how the mold 201 is closed in the method for manufacturing the oil pan 1 according to the modification. FIG. 14 is a cross-sectional view showing how the mold 201 is closed in the method of manufacturing the oil pan 1 according to the modification.

When manufacturing the oil pan 1 using the insert collar 9 as described above, as shown in FIG. When setting in the cavity mold 203 , the end face of the protruded streak portion 31 on the outer periphery of the flange 15 is brought into contact with the cavity mold 203 . At this time, the seating surface 19 of the flange 15 of the insert collar 9 is in a state of floating with a gap from the cavity mold 203 .

Then, when the cavity mold 203 in which the insert collar 9 is set and the core mold 205 are closed, the insert collar 9 is pressed against the cavity mold 203 by the rod member 215 via the cap member 51 . As a result, as shown in FIG. 14, the flange 55 of the insert collar 9 is flexed at the flexible portion 23, the seating surface 19 abuts against the cavity 203, and the end face of the protruding portion 31 is strongly against the cavity 203. be pushed. Thereby, the gap between the flange 15 of the insert collar 9 and the cavity 203 is sealed by the projection 31 due to the elasticity of the flange 15 . In this state, the cavity 225 is filled with molten resin R to form the oil pan 1 in the same manner as in the above-described embodiment.

In the insert collar 9 of this modified example, in the flange 15, the annular protruding portion 31 extends toward the opening of the first open end 13a on which the flange 15 is provided on the outer peripheral side of the groove-shaped recessed portion 17. It protrudes from the seating surface 19. According to such a configuration, in the process of closing the mold 201 for insert molding of the oil pan 1, the protruding streak portion 31 is preferentially brought into contact with the cavity mold 203, and the flange 15 is flexed by the flexible portion 23. By deforming, it is possible to allow dimensional errors between the insert collar 9 and the molding die 201 . In addition, since the flange 15 of the insert collar 9 is easily bent at the flexible portion 23, the extra load applied to the molding die 201 can be reduced, and the molding die 201 is not adversely affected even if the number of molding times (the number of shots) is increased. Hard to get out.

As described above, preferred embodiments have been described as illustrations of the technology of the present disclosure. However, the technology of the present disclosure is not limited to this, and can also be applied to embodiments in which changes, replacements, additions, omissions, etc. are made as appropriate. Also, the components described in the attached drawings and detailed description may include components that are not essential for solving the problem. Therefore, it should not be determined that those non-essential components are essential just because they are described in the accompanying drawings and detailed description.

For example, the above embodiment may be configured as follows.

In the above embodiment, the groove-shaped concave portion 17 is formed in an annular shape, but the technology of the present disclosure is not limited to this. The groove-shaped concave portion 17 may be formed in an annular shape with another outer shape such as a rectangular shape. Further, as the groove-shaped recess 17, two or three annular groove-shaped recesses 17 having different diameters may be provided. Moreover, the groove-shaped recessed part 17 may be divided|segmented and provided in the circumferential direction of the flange 15. As shown in FIG. In this case, adjacent groove-shaped recesses 17 may partially overlap in the radial direction of the flange 15 . In short, it is sufficient that the groove-shaped concave portion is provided over the entire circumference of the flange 15 regardless of whether there is one groove-shaped concave portion or a plurality of groove-shaped concave portions.

In the above embodiment, the oil pan 1 was described as an example of the resin molded product according to the technique of the present disclosure, but the application range of the technique of the present disclosure is not limited to this. The technology of the present disclosure can be applied to any resin molded product in which a cylindrical insert collar is integrally incorporated by insert molding for fastening with another member.

INDUSTRIAL APPLICABILITY The technique of the present disclosure is useful for a method of manufacturing an insert collar and a resin molded article including the same.

R Resin 1 Oil pan (resin molded product)
3 cup portion 5 outer peripheral mounting portion 7 through hole 9 insert collar 11 bolt insertion hole 13 cylindrical portion 13a first opening end 13b second opening end 15 flange 17 groove recess 19 seating surface 21 outer peripheral wall 23 flexible portion 25 Resin portion 27 Seal recess 29 Sealing member 31 Projection 51 Cap member 53 Insertion portion 55 Flange 57 Extension 101 Cylinder block 103 Bolt (fastening member)
105 screw hole 201 mold 203 cavity mold (first mold)
205 core mold (second mold)
207 first molding surface 209 positioning projection 211 second molding surface 213 receiving hole 215 rod member 217 base plate 219 spring 221 stopper 223 ejector pin 225 cavity

Claims (3)

A cylindrical insert collar with both ends open, used for insert molding of a resin molded product (1),
having a flange (15) on at least one open end (13a),
The flange (15) is provided with a groove-shaped recess (17) that opens in the opening direction of the opening end (13a) over the entire circumference,
An insert collar, wherein a portion of the flange (15) inside the groove-shaped recess (17) constitutes a seating surface (19) for the fastening member (103). The insert collar according to claim 1,
An insert collar, wherein the groove-shaped recess (17) is formed in an annular shape. In the insert collar according to claim 2,
The portion of the flange (15) provided with the groove-shaped recess (17) constitutes a flexible portion (23) that is more flexible than the portion of the flange (15) that constitutes the seating surface (19). ,
A portion of the flange (15) on the outer peripheral side of the groove-shaped recess (17) protrudes from the seating surface (19) in the opening direction of the opening end (13a) provided with the flange (15). An insert collar, characterized in that it is provided with an annular ridge (31).

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