Resin component and method for manufacturing same

Abstract

This resin component comprises: a first main body part formed from a resin; and an attachment part provided to the first main body part. The attachment part has a metal collar and a collar holding part formed from a resin and provided so as to cover the outer circumferential surface of the collar. The collar has a cylindrical second body part and a flange part which is provided continuously with the second body part at a first end portion of the second body part and which projects outward from the second body part. The flange part has: a first surface that intersects a third direction, which is the axial direction of the second body part; a second surface that faces the first surface in the third direction and is positioned on the side closer to a second end portion of the second body part; a third surface that is parallel to the third direction and continuous with the first surface and the second surface; and a fourth surface that is formed on the outer peripheral edge of the first surface so as to be inclined toward the second end portion of the second body part. The collar holding part covers the outer peripheral surface of the second body part and a part of the third surface, and in the color holding part, a seventh surface intersecting the third direction and positioned on the side closer to the flange part is provided at a position that, in comparison to the first surface, is a first distance closer to the second end portion of the second body part.

Description

Resin parts and their manufacturing method

[0001] The present disclosure relates to a resin part and a manufacturing method thereof, and more particularly to a resin part having an attachment portion in which the outer peripheral surface of a cylindrical metal collar is covered with resin.

[0002] When a resin case that houses a heavy object such as a motor inside is attached and fixed to external equipment, a cylindrical metal collar is attached to the case, and a bolt inserted into the collar is fastened to attach the case to the external equipment.

[0003] When incorporating a collar into a case, for example, as disclosed in Patent Document 1, a method has been proposed in which a resin is insert-molded to cover the outer peripheral surface of the collar.

[0004] When a collar incorporated into the mounting part of a case is used as a bolt insertion hole, a flange that protrudes outward is often provided at one end of the collar so that the bolt head abuts against the flange. Cold forging is often used to provide a flange on a cylindrical collar. Cold forging is a metalworking method in which metal is pressured at room temperature to deform and form the shape.

[0005] When cold forging is used, a cylindrical collar is prepared, and pressure is applied to one end of the collar at room temperature to expand it outward, thereby forming a flange portion on the collar.

[0006] However, this results in sagging at the outer edge of the flange. If resin adheres to the sagging area during resin insert molding, when the bolt is inserted into the collar and fastened, resin will be present on the contact surface of the flange with the bolt head. If resin is present on this fastening surface, there is a concern that the resin may peel off and generate foreign matter when the bolt is fastened. Furthermore, if the volume of the resin decreases over time or due to changes in the ambient temperature, a gap will form at the contact point between the bolt and the flange, raising concerns that the bolt may become loose.

[0007] Although the other end of the collar does not have a flange, a collar formed by cold forging may have sagging at the end surface of the other end. Therefore, during insert molding, resin may adhere to the sagging portion of the end surface of the other end. Because the other end surface of the collar abuts against the case mounting surface of the external equipment, foreign matter may be generated or a gap may form at the abutting portion between the end surface and the case mounting surface, which may prevent the case from being stably attached to the external equipment, as in the case where resin adheres to the flange.

[0008] Japanese Patent Application Laid-Open No. 2004-042561

[0009] The present disclosure has been made in view of the above points, and an object of the present disclosure is to provide a resin part and a manufacturing method thereof that can prevent resin from adhering to a contact surface of a collar incorporated in a mounting portion with another component.

[0010] To achieve the above object, the resin part according to the present disclosure includes a resin first body portion and an attachment portion provided on the first body portion. The attachment portion includes a metal collar and a resin collar holder provided to cover the outer peripheral surface of the collar. The collar includes a cylindrical second body portion and a flange portion provided at a first end of the second body portion, continuous with the second body portion, and extending outward from the second body portion. The flange portion includes a first surface intersecting a third direction, which is the axial direction of the second body portion; a second surface facing the first surface in the third direction and located closer to the second end of the second body portion; and a third surface parallel to the third direction and continuous with the first and second surfaces. A fourth surface is provided on the outer peripheral edge of the first surface, inclined toward the second end of the second body portion. The collar holder covers the outer peripheral surface of the second body portion and a portion of the third surface. In the collar holding portion, a seventh surface that intersects with the third direction and is located closer to the flange portion is located at a position closer to the second end of the second main body portion by a first distance from the first surface.

[0011] It is preferable that a sixth surface is provided on the outer peripheral edge of a fifth surface located at the second end of the second main body portion, the sixth surface being inclined toward the first end of the second main body portion, the collar holding portion covering a portion of the outer peripheral surface of the second main body portion, and the eighth surface of the collar holding portion intersecting the third direction and located closer to the second end is provided at a position closer to the first end of the second main body portion by a second distance from the fifth surface.

[0012] It is preferable that the collar holding portion is provided so as not to cover the fourth surface.

[0013] The collar holding portion may be provided so as not to cover the sixth surface.

[0014] The collar holding portion is preferably made of a thermosetting resin.

[0015] The collar is preferably formed by cold forging.

[0016] The first body portion may be a hollow member.

[0017] The first body portion may have fixing legs for attachment to external equipment.

[0018] A method for manufacturing a resin part according to the present disclosure includes a first step of preparing the collar, a second step of placing the collar at a predetermined position in a mold having a cavity, and a third step of injecting resin into the cavity and insert-molding the collar holding portion so as to cover the outer peripheral surface of the second main body portion of the collar. The mold includes a first mold having a support pin to which the collar is attached, and a second mold disposed opposite the first mold. The cavity is a space formed when the first mold and the second mold abut against each other, and a first step is provided on the abutment surface of the first mold with the flange portion in a cross-sectional view, and the height of a side surface of the first step is the first distance. In the second step, the first surface of the flange portion abuts against a bottom surface of the first step.

[0019] In a cross-sectional view, it is preferable that a second step is provided on the contact surface with the fifth surface of the second main body portion in the second mold, the height of the side of the second step is a second distance, the fifth surface is the end surface of the second end portion of the second main body portion, and in the second step, the fifth surface is contacted with the bottom surface of the second step.

[0020] The resin is preferably a thermosetting resin.

[0021] According to the present disclosure, it is possible to prevent resin from adhering to the contact surface of the collar incorporated in the mounting portion with other components, thereby suppressing the generation of foreign matter and loosening of fastening members fastened to the mounting portion.

[0022] Fig. 1 is a view of a blower case according to an embodiment as seen from above. Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. Fig. 3A is an enlarged view of a portion surrounded by dashed line IIIA in Fig. 2. Fig. 3B is an enlarged view of a portion surrounded by dashed line IIIB in Fig. 2. Fig. 4 is a diagram for explaining a method for manufacturing a mounting portion of a blower case. Fig. 5 is a partial enlarged view of a first mold. Fig. 6 is a partial enlarged view of a second mold.

[0023] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the present disclosure, its applications, or its uses.

[0024] (Embodiment) [Configuration of Blower Case] ​​Fig. 1 is a view from above of a blower case 10, which is a resin part according to an embodiment. Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. In the following description, the direction perpendicular to the paper surface is referred to as the Z direction or third direction. The direction perpendicular to the Z direction is referred to as the X direction or first direction. The directions perpendicular to both the X direction and the Z direction are referred to as the Y direction or second direction. The Z direction is also the axial direction of the second main body portion 41 of the collar 40 (see Fig. 2). In the Z direction, the side on which the flange portion 42 of the collar 40 is provided is referred to as the upper side or top, and the side on which the fifth surface 41a is provided is referred to as the lower side or bottom (see Fig. 2).

[0025] In this specification, "parallel," "same," or "orthogonal" means that the two are parallel, the same, or orthogonal, taking into account the assembly tolerance or processing tolerance of the blower case 10 or its component parts, the mounting portion 30 or the collar 40. "Parallel," "same," or "orthogonal" does not necessarily mean that the objects being compared are parallel, the same, or orthogonal in the strict sense. In other words, the X direction, Y direction, and Z direction can be said to intersect with each other.

[0026] As shown in FIG. 1 , the blower case 10 has a first main body portion 20 having an opening 21 and an airflow outlet 22 that is continuous with the first main body portion 20 and opens in the Y direction. The first main body portion 20 is annular when viewed from above. The first main body portion 20 is a hollow member. Although not shown, a centrifugal fan and a motor connected to the centrifugal fan (neither of which are shown) are disposed in the opening 21. Operating the motor rotates the centrifugal fan, causing airflow to be discharged from the airflow outlet 22. A heat-generating object, such as a storage battery, disposed in the direction of the airflow discharge is cooled by the airflow discharged from the airflow outlet 22.

[0027] Three mounting portions 30 are provided at intervals on the outer peripheral surface of the first main body portion 20. The mounting portions 30 include a collar 40 and a collar holder 31 (see FIG. 2). The first main body portion 20 and the airflow outlet 22 are integrally molded from resin. The collar holder 31 is also a member made of resin. The collar holder 31 may be integrally molded with the first main body portion 20 and the airflow outlet 22. However, the collar 40 may be incorporated into the collar holder 31, and the mounting portion 30 may be completed, and then the mounting portion 30 may be attached to the first main body portion 20 by welding or other methods.

[0028] [Configuration of Mounting Portion] Fig. 3A is an enlarged view of a portion surrounded by dashed line IIIA in Fig. 2. Fig. 3B is an enlarged view of a portion surrounded by dashed line IIIB in Fig. 2.

[0029] As shown in FIG. 2 , the mounting portion 30 has a collar 40 and a collar holding portion 31. The collar 40 is a cylindrical member made of metal, for example, low-carbon steel. The collar 40 has a second main body portion 41 and a flange portion 42 formed integrally with the second main body portion 41. The second main body portion 41 is a straight cylindrical member. The flange portion 42 protrudes from a first end portion 41A, which is the upper end portion of the second main body portion 41, to the outside of the second main body portion 41 along an XY plane perpendicular to the Z direction. The XY plane is an imaginary plane that includes an imaginary line extending along the X direction and an imaginary line extending along the Y direction within the plane.

[0030] As shown in FIG. 3A , the flange portion 42 has a first surface (upper surface) 42a, a second surface (lower surface) 42b facing the first surface 42a in the Z direction, and a third surface (side surface) 42c parallel to the Z direction and continuous with the first surface 42a and the second surface 42b. A fourth surface (first inclined surface) 42d inclined in the Z direction is formed on the outer periphery of the first surface 42a. FIG. 2 shows an example in which the fourth surface 42d is an inclined surface that is convex upward. However, this is not particularly limited. The fourth surface 42d may also be an inclined surface that is convex downward. The fourth surface 42d may have irregularities in the Z direction.

[0031] The collar 40 is formed by cold forging. Although not shown, a straight cylindrical member made of low-carbon steel is pressed from above to deform the flange portion 42. Pressing the cylindrical member causes a so-called sagging to occur on the outer periphery of the flange portion 42, forming a fourth surface 42d that is inclined in the Z direction from the first surface 42a.

[0032] As shown in FIG. 3B , for the same reason, a sixth surface (second inclined surface) 41b inclined in the Z direction is formed on the fifth surface (end surface) 41a of the second end 41B, which is the lower end of the second main body portion 41. The end surface 41a is a surface parallel to the XY plane. FIG. 2 shows an example in which the sixth surface 41b is an inclined surface that is convex downward. However, this is not particularly limited. The sixth surface 41b may also be an inclined surface that is convex upward. The sixth surface 41b may have irregularities in the Z direction.

[0033] As shown in FIG. 2 , the collar holding portion 31 has a seventh surface (upper surface) 31a and an eighth surface (lower surface) 31b. The collar holding portion 31 is made of a thermosetting resin. The collar holding portion 31 is configured to cover the outer peripheral surface of the collar 40. As shown in FIG. 3A , the seventh surface 31a of the collar holding portion 31 is located a first distance D1 below the first surface 42a of the flange portion 42 in the Z direction. The first distance D1 is set to be longer than the distance d1 in the Z direction from the first surface 42a to the lower end of the fourth surface 42d. In other words, the collar holding portion 31 covers the outer peripheral surface of the second main body portion 41 of the collar 40 and portions of the second surface 42b and third surface 42c of the flange portion 42. However, the collar holding portion 31 is formed so as not to cover the first surface 42a, fourth surface 42d, and third surface 42c of the flange portion 42. The first distance D1 may be the same as the distance d1. In this case, the collar holding portion 31 is formed so as to cover the entire second surface 42b and the entire third surface 42c of the flange portion 42.

[0034] 3B , the eighth surface 31b of the collar holding portion 31 is located above the fifth surface 41a of the second main body portion 41 by a second distance D2 in the Z direction. The second distance D2 is set to be longer than the distance d2 in the Z direction from the fifth surface 41a to the upper end of the sixth surface 41b. In other words, the collar holding portion 31 is formed so as to cover the outer peripheral surface of the second main body portion 41 but not cover the fifth surface 41a and the sixth surface 41b. The second distance D2 may be the same as the distance d2.

[0035] 1 and 2 , when attaching the blower case 10 to external equipment, the mounting portion 30 is installed on the support portion 60 of the external equipment. At this time, the mounting portion 30 is installed on the support portion 60 so that the eighth surface 31b of the collar holding portion 31 abuts against the installation surface 60a. The mounting portion 30 is aligned with the support portion 60 so that the through-hole 43 of the collar 40 and the mounting hole 60b provided in the support portion 60 overlap when viewed from above, and then the mounting portion 30 is installed on the support portion 60.

[0036] After inserting bolts (fastening members) 50 into through holes 43 and mounting holes 60b, the bolts 50 are tightened to attach and fix the mounting part 30 to the support part 60. In this manner, the blower case 10 is attached and fixed to the external equipment.

[0037] Actual measurements showed that the actual values ​​of the distances d1 and d2 were approximately 0.1 mm or less. Therefore, it is preferable to set both the first distance D1 and the second distance D2 to 0.1 mm or more. In practice, the first distance D1 and the second distance D2 must be set taking into consideration factors such as thermal shrinkage of the resin, the processing tolerance of the mold 100 (see FIG. 4), and the processing tolerance of the flange portion 42 of the collar 40.

[0038] [Method of Manufacturing Mounting Portion] Figure 4 is a diagram for explaining a method of manufacturing the mounting portion 30 of the blower case 10. Figure 5 is a partial enlarged view of the first mold 110. Figure 6 is a partial enlarged view of the second mold 120. For ease of explanation, the resin inlet is omitted from Figures 4 to 6.

[0039] The mounting portion 30 is formed by insert molding. Further explanation will be given below with reference to Figures 4 to 6. As shown in Figure 4, the mold 100 for insert molding is composed of a first mold 110 having a support pin 112, and a second mold 120 arranged opposite the first mold 110 with a gap in the longitudinal direction of the support pin 112.

[0040] As shown in Fig. 4, the support pins 112 provided on the first mold 110 are inserted into the through holes 43 of the collar 40 to attach the collar 40 to the first mold 110. Next, the first mold 110 is moved toward the second mold 120 so that the first contact surface 110a of the first mold 110 contacts the second contact surface 120a of the second mold 120. By doing so, the tips of the support pins 112 are fitted into the recesses 122 provided in the second mold 120, and a cavity 101 is formed between the first mold 110 and the second mold 120. The support pins 112 and the collar 40 are disposed inside the cavity 101.

[0041] In this state, resin is injected into the cavity 101 through a resin injection port (not shown) provided in the second mold 120. This resin is a thermosetting resin. To ensure fluidity, the resin is heated to several tens of degrees Celsius at the time of injection. The mold 100 is heated to approximately the thermosetting temperature of the resin, for example, approximately one hundred and several tens of degrees Celsius to 230°C. As a result, the resin that has flowed into the cavity 101 solidifies, and a collar holding portion 31 is formed to cover the outer peripheral surface of the collar 40. After the formation of the collar holding portion 31 is completed, the first mold 110 and the second mold 120 are separated, and the attachment portion 30 is removed from the mold 100.

[0042] 3A and 5, a first annular step 111 is provided on the installation surface of the support pin 112 of the first mold 110, surrounding the support pin 112. When the collar 40 is attached to the support pin 112, the first surface 42a of the flange portion 42 abuts against the bottom surface 111a of the first step 111. Meanwhile, a portion of the third surface 42c of the flange portion 42 abuts against the side surface 111b of the first step 111. The height of the first step 111 relative to the bottom surface 111a is equal to the first distance D1 described above.

[0043] 3B and 6 , a circular second step 121 is provided on the surface of the second mold 120 where the recess 122 is formed, surrounding the recess 122. With the tip of the support pin 112 fitted into the recess 122, the fifth surface 41a of the second main body portion 41 abuts against the bottom surface 121a of the second step 121. Meanwhile, a portion of the outer peripheral surface of the second main body portion 41 abuts against the side surface 121b of the second step 121. The height of the second step 121 relative to the bottom surface 121a is equal to the second distance D2 described above.

[0044] 4 illustrates only the portions of the first mold 110 and the second mold 120 related to the mounting portion 30. When the mounting portion 30 is formed integrally with the first main body 20 or the airflow outlet 22 of the blower case 10, the shapes of the first mold 110 and the second mold 120 become complex, reflecting the shapes of the first main body 20 or the airflow outlet 22, respectively. In the following description, the blower case 10 provided with the mounting portion 30 may be referred to as a resin part.

[0045] [Effects, etc.] As described above, the blower case (plastic part) 10 according to this embodiment includes the hollow first body portion 20 made of plastic, and the attachment portion 30 provided on the first body portion 20. The attachment portion 30 includes the metal collar 40 and the plastic collar holder 31 provided to cover the outer peripheral surface of the collar 40.

[0046] The collar 40 has a cylindrical second main body portion 41 and a flange portion 42 that is provided at a first end 41A of the second main body portion 41, is continuous with the second main body portion 41, and extends outward from the second main body portion 41.

[0047] The flange portion 42 has a first surface (upper surface) 42a that is perpendicular to the Z direction (third direction), which is the axial direction of the second main body portion 41, and a second surface (lower surface) 42b that faces the first surface 42a in the Z direction and is located closer to the second end portion 41B of the second main body portion 41. The flange portion 42 also has a third surface (side surface) 42c that is parallel to the Z direction and continuous with the first surface 42a and the second surface 42b. A fourth surface (first inclined surface) 42d that is inclined toward the second end portion 41B of the second main body portion 41 is provided on the outer circumferential edge of the first surface 42a.

[0048] The collar holding portion 31 covers the outer peripheral surface of the second main body portion 41 and a portion of the third surface 42c of the flange portion 42. The seventh surface (upper surface) 31a of the collar holding portion 31 is perpendicular to the Z direction and located closer to the flange portion 42. The seventh surface 31a is located closer to the second end portion 41B of the second main body portion 41 by a first distance D1 from the first surface 42a.

[0049] By configuring the blower case 10 in this manner, it is possible to prevent resin from adhering to the fourth surface 42d, where sagging occurs in the flange portion 42 of the collar 40, during the insert molding of the mounting portion 30. This prevents the resin adhering to the fourth surface 42d from peeling off and generating foreign matter when the bolt 50 is inserted into the collar 40 and fastened. Furthermore, the volume of the resin decreases with age or changes in the ambient temperature, creating a gap where the bolt 50 abuts the flange portion 42, preventing the bolt 50 from loosening.

[0050] Furthermore, when the bolts 50 are tightened, resin cracks can be prevented from occurring, which can cause cracks in the collar holding portion 31. This prevents the collar holding portion 31, and in turn the mounting portion 30, from being damaged, causing the blower case 10 to fall off the support portion 60.

[0051] The first distance D1 is preferably set to be equal to or longer than the distance d1 in the Z direction from the first surface 42a to the lower end of the fourth surface 42d. In other words, the collar holding portion 31 is preferably provided so as not to cover the fourth surface 42d. This reliably prevents resin from adhering to the fourth surface 42d during insert formation of the mounting portion 30.

[0052] The outer peripheral edge of the fifth surface (end surface) 41a located at the second end 41B of the second main body portion 41 of the collar 40 is provided with a sixth surface (second inclined surface) 41b that slopes toward the first end 41A.

[0053] The collar holding portion 31 covers a part of the outer peripheral surface of the second main body portion 41. The eighth surface (lower surface) 31b of the collar holding portion 31 is perpendicular to the Z direction and located closer to the second end portion 41B. The eighth surface 31b is located closer to the first end portion 41A of the second main body portion 41 by a second distance D2 from the fifth surface 41a.

[0054] As described above, the sixth surface 41b, which is a sagging portion, may also be formed on the outer peripheral edge of the fifth surface 41a located at the lower end of the second main body portion 41 of the collar 40. Therefore, according to this embodiment, resin is prevented from adhering to the sixth surface 41b, and when the bolt 50 is inserted into the collar 40 and fastened, it is possible to suppress the resin adhering to the fourth surface 42d from peeling off and generating foreign matter. Furthermore, the volume of the resin decreases with aging or changes in the ambient temperature, which creates a gap at the contact portion between the bolt 50 and the flange portion 42, thereby suppressing loosening of the bolt 50.

[0055] Furthermore, when the bolts 50 are tightened, resin cracks can be prevented from occurring, which can cause cracks in the collar holding portion 31. This prevents the collar holding portion 31, and in turn the mounting portion 30, from being damaged, causing the blower case 10 to fall off the support portion 60.

[0056] The second distance D2 is preferably set to be equal to or longer than the distance d2 in the Z direction from the fifth surface 41a to the upper end of the sixth surface 41b. In other words, the collar holding portion 31 is preferably provided so as not to cover the sixth surface 41b. This reliably prevents resin from adhering to the sixth surface 41b during insert formation of the mounting portion 30.

[0057] In this embodiment, the collar holding portion 31 and the first main body portion 20 are integrally formed. This reduces the number of molds or molding steps required to form the blower case 10, thereby reducing the manufacturing cost of the blower case 10. As described above, the mounting portion 30 and the first main body portion 20 may be formed separately, and then the mounting portion 30 may be attached to the first main body portion 20. This simplifies the shape of the mold used to form the blower case 10.

[0058] In this embodiment, the resin portion of the blower case 10 is made of a thermosetting resin. As described above, a motor is housed inside the blower case 10. Because the motor generates heat during operation, if the blower case 10 were made of a thermoplastic resin, there is a risk of the blower case 10 being deformed by the heat. As shown in this embodiment, by making the resin portion of the blower case 10 out of a thermosetting resin, deformation due to heat generated by the motor is prevented, and the operational reliability of the blower unit can be ensured.

[0059] Furthermore, the collar 40 in this embodiment is formed by cold forging, which allows the collar 40 to be manufactured easily and at low cost, thereby reducing the manufacturing cost of the blower case 10.

[0060] The method for manufacturing the mounting portion 30 of the blower case 10 according to this embodiment includes the following first to third steps.

[0061] In the first step, the collar 40 is prepared. In the second step, the collar 40 is placed at a predetermined position in the mold 100 having the cavity 101. In this embodiment, the collar 40 is attached to the support pin 112 of the first mold 110.

[0062] In the third step, resin is injected into the cavity 101 and the collar holding portion 31 is insert-molded so as to cover the outer peripheral surface of the second main body portion 41 of the collar 40 .

[0063] The mold 100 is composed of a first mold 110 having support pins 112 to which the collar 40 is attached, and a second mold 120 disposed opposite the first mold 110. The space formed when the first mold 110 and the second mold 120 come into contact with each other is a cavity 101.

[0064] In a cross-sectional view, a first step 111 is provided on the contact surface of the first mold 110 with the flange portion 42. The height of a side surface 111b of the first step 111 is a first distance D1. In a second step, the first surface 42a of the flange portion 42 is brought into contact with the bottom surface 111a of the first step 111.

[0065] In this way, the first step 111 of the first mold 110 can prevent the resin from adhering to the fourth surface 42d on the outer periphery of the first surface 42a of the flange portion 42. This can prevent the generation of foreign matter when the bolt 50 is fastened, the loosening of the bolt 50 due to a reduction in the volume of the resin, and damage to the collar holding portion 31.

[0066] Additionally, in a cross-sectional view, a second step 121 is provided on the contact surface of the second mold 120 with the fifth surface 41a of the second main body portion 41. The height of the side surface 121b of the second step 121 is a second distance D2. The fifth surface 41a is the end surface of the second end portion 41B of the second main body portion 41. In a second step, the fifth surface 41a is brought into contact with the bottom surface 121a of the second step 121.

[0067] The cross-sectional view referred to here refers to the cross section of the mold 100 with the collar 40 installed, cut through the axis of the support pin 112, as shown in Figures 4 to 6, and viewing the collar 40 and the mold 100.

[0068] In this way, the second step 121 of the second mold 120 can prevent the resin from adhering to the sixth surface 41b on the outer periphery of the fifth surface 41a of the second main body portion 41. This can prevent the generation of foreign matter when the bolt 50 is fastened, the loosening of the bolt 50 due to a reduction in the volume of the resin, and damage to the collar holding portion 31.

[0069] Furthermore, it is preferable that the resin injected into cavity 101 be a thermosetting resin. By constructing collar holding portion 31 from a thermosetting resin in this way, deformation due to heat generated by the motor is prevented, the strength of mounting portion 30 is ensured, and blower case 10 can be securely mounted to support portion 60 of the external equipment. Furthermore, blower case 10 can be prevented from falling off support portion 60 when the motor is operating.

[0070] Other Embodiments In the above-described embodiment, the blower case 10 was used as an example. However, the resin part on which the mounting portion 30 is provided is not limited to this. For example, the resin part may be a fixing leg attached to a support portion 60 of external equipment. The mounting portion 30 may be part of the fixing leg. When a resin part having the mounting portion 30 is attached to external equipment using a fastening member such as a bolt, it is only necessary to prevent the generation of foreign matter due to chipping of resin adhering to the first inclined surface 42d or the second inclined surface 41b in the collar holding portion 31 of the mounting portion 30. It is also only necessary to prevent loosening of the bolt 50 due to a volumetric reduction of the resin and damage to the collar holding portion 31.

[0071] Furthermore, when the mounting portion 30 and the first main body portion 20 are formed separately, it is preferable that at least the collar holding portion 31 be made of a thermosetting resin, which can prevent foreign matter from being generated when the bolt 50 is fastened, the bolt 50 from loosening due to a decrease in the volume of the resin, and damage to the collar holding portion 31.

[0072] Furthermore, in the present specification, an example is shown in which a collar 40 formed by cold forging is used. However, the manufacturing method of the collar 40 is not limited to this. If, for processing reasons or the like, a downwardly inclined surface is formed on the outer peripheral edge of the first surface (upper surface) 42a of the flange portion 42 of the collar 40, forming the mounting portion 30 using the configuration or method disclosed in the present specification can achieve the same effect as that shown in the embodiment. In other words, it is possible to prevent resin from adhering to the inclined surface on the outer peripheral edge of the first surface 42a. This prevents the generation of foreign matter when the bolt 50 is fastened, the loosening of the bolt 50 due to a reduction in the volume of the resin, and damage to the collar holding portion 31.

[0073] The resin part of the present disclosure is useful because it can prevent resin from adhering to the contact surface of the collar incorporated in the mounting portion with other parts.

[0074] 10 Blower case (resin part) 20 First main body portion 21 Opening 22 Air flow outlet 30 Mounting portion 31 Collar holding portion 31a Seventh surface (upper surface) 31b Eighth surface (lower surface) 40 Collar 41 Second main body portion 41A First end portion (upper end portion) 41B Second end portion (lower end portion) 41a Fifth surface (end surface) 41b Sixth surface (second inclined surface) 42 Flange portion 42a First surface (upper surface) 42b Second surface (lower surface) 42c Third surface (side surface) 42d Fourth surface (first inclined surface) 43 Through hole 50 Bolt (fastening member) 60 Support portion 60a Installation surface 60b Mounting hole 100 Mold 101 Cavity 110 First mold 110a First contact surface 111 First step 111a Bottom surface 111b Side surface 112 Support pin 120 Second mold 120a Second contact surface 121 Second step 121a Bottom surface 121b Side surface 122 Recess

Claims

1. A device comprising: a first body portion made of resin; and an attachment portion provided on the first body portion, wherein the attachment portion has: a metal collar; and a resin collar holding portion provided so as to cover the outer peripheral surface of the collar; the collar having: a cylindrical second body portion; and a flange portion provided at a first end of the second body portion and continuous with the second body portion, and projecting outward from the second body portion; the flange portion having: a first surface intersecting a third direction which is the axial direction of the second body portion; a second surface opposing the first surface in the third direction and located closer to the second end of the second body portion; a third surface which is parallel to the third direction and continuous with the first surface and the second surface; and a fourth surface formed on the outer peripheral edge of the first surface so as to be inclined toward the second end of the second body portion; the collar holding portion covers the outer peripheral surface of the second body portion and a part of the third surface. In the collar holding portion, a seventh surface that intersects with the third direction and is located closer to the flange portion is a resin part that is located a first distance closer to the second end of the second main body portion with respect to the first surface.

2. A resin part as described in claim 1, wherein a sixth surface is provided on the outer peripheral edge of a fifth surface located at the second end of the second main body portion, the sixth surface being inclined toward the first end of the second main body portion, the collar holding portion covers a part of the outer peripheral surface of the second main body portion, and an eighth surface of the collar holding portion that intersects with the third direction and is located on the side closer to the second end is located a second distance from the fifth surface closer to the first end of the second main body portion.

3. A resin part according to claim 1, wherein the collar holding portion is provided so as not to cover the fourth surface.

4. A resin part according to claim 2, wherein the collar holding portion is provided so as not to cover the sixth surface.

5. A resin part according to claim 1, wherein the collar holding portion is made of a thermosetting resin.

6. A resin part according to any one of claims 1 to 5, wherein the collar is formed by cold forging.

7. A resin part according to claim 6, wherein the first main body portion is a hollow member.

8. A resin part according to claim 6, wherein the first main body portion has fixing legs for attachment to external equipment.

9. A method for manufacturing a resin part as recited in claim 6, comprising: a first step of preparing the collar; a second step of placing the collar at a predetermined position in a mold having a cavity; and a third step of injecting resin into the cavity and insert-molding the collar holding portion so that it covers the outer peripheral surface of the second main body portion of the collar, wherein the mold is composed of a first mold having a support pin to which the collar is attached, and a second mold positioned opposite the first mold, the cavity is the space formed when the first mold and the second mold abut, a first step is provided on the abutting surface with the flange portion of the first mold in a cross-sectional view, and the height of the side of the first step is the first distance, and wherein in the second step, the first surface of the flange portion abuts against the bottom surface of the first step.

10. A method for manufacturing a resin part as described in claim 9, wherein, in a cross-sectional view, a second step is provided on the contact surface of the second mold with the fifth surface of the second main body portion, the height of the side of the second step is the second distance, the fifth surface is the end face of the second end of the second main body portion, and in the second step, the fifth surface is contacted with the bottom surface of the second step.

11. A method for manufacturing a resin part according to claim 9, wherein the resin is a thermosetting resin.

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