JP6235820B2 - Mounting structure and assembly method for resin molded products - Google Patents

Description

The present invention provides a mounting structure in which a resin molded product is attached to a mating member with a bolt, in particular, a reinforcing collar is disposed in a through hole of the resin molded product, and the bolt is inserted into the bolt insertion hole of the reinforcing collar. The present invention relates to a mounting structure for fastening a resin molded product to a mating member and a method for assembling the mounting structure.

  When the resin molded product is attached to a mating member such as a metal member, the reinforcing collar is fitted into the through hole of the mounting portion of the resin molded product, and the bolt is inserted into the bolt insertion hole of the reinforcing collar. It is often performed that the resin molded product is fastened to the mating member by screwing the mating member to the mating member. Also, the height of the mounting part of the resin molded product and the height of the reinforcing collar are the same, and a part of the resin molded product is projected, and the mounting part of the resin molded product and the mating member are fastened by bolts or the like. In this case, the protruding part of the resin molded product is compressed, so that not only between the bolt and the reinforcing collar, but also between the bolt and the mounting part, the mounting part is secured. A device that is fixed to a mating member is known (see Patent Document 1).

A microfilm of the actual application No. 55-150964 (No. 57-76406) (page 3, lines 14-19, FIG. 4)

  However, in the case of Patent Document 1, when the reinforcing collar is press-fitted into the through hole of the attaching portion, it is necessary to assemble the reinforcing collar so that the attaching portion and the reinforcing collar are at the same height position. It is necessary to set the height of the reinforcing collar with respect to the height of the resin molded product with high accuracy. Since it is difficult to improve the accuracy of resin molding of resin molded products, it is necessary to improve the precision of subtle machining such as cutting of the reinforcing collar, resulting in lower production efficiency of the reinforcing collar and higher costs. Leads to. Moreover, in practical use, defective products are easily produced, and the mounting is low in reliability.

  For example, the accuracy of dimensional management is poor, and the mating member side of the reinforcing collar (hereinafter referred to as the tip portion side) or the non-partner member side (hereinafter referred to as the tip) with respect to the mating member side or non-partner member side of the mounting portion In the case of protruding part), the reinforcing collar is pressed by tightening a bolt or the like, but the mounting portion is not pressed and is not fixed securely. In addition, when the mounting part is longer than a predetermined allowable dimension and the reinforcing collar is short and retracted, the mounting part is pressed by tightening bolts, etc., but the collar is not pressed and is not securely fixed. . At the same time, a part of the attachment portion may bite between the reinforcing collar and the contact surface of the mating member or the bolt, resulting in damage to the attachment portion.

  The present invention has been made in view of the above problems, and its purpose is to facilitate the dimensional control of both the front end portion and the rear end portion of the reinforcing collar and to provide a highly reliable attachment. An object of the present invention is to provide a mounting structure for a resin molded product having a possible mounting portion.

  In the present invention, when assembling, both the front end portion and the rear end portion of the reinforcing collar are assembled so as to protrude from the mounting portion of the resin molded product. The resin molded product can be fastened to the mating member over both the product mounting portion and the reinforcing collar.

Specifically, according to the first aspect of the present invention, a cylindrical reinforcing collar having a bolt insertion hole is in an intimate or joined state on the inner peripheral surface of an annular through hole provided in the mounting portion of the resin molded product. A resin molded product mounting structure for fastening the resin molded product to a mating member by screwing a flanged bolt inserted into the bolt insertion hole of the reinforcing collar into the mating member, An annular concave portion that is larger than the through hole is formed at the periphery of the through hole, and the flanged bolt (21) is formed on the mating member side of the mounting portion. includes a rear end portion of the collar reinforcement (7) (7b) and a non-counterpart member side of the attachment portion (3) flange portion which is in contact with (3b) (23), the reinforcing collar (7), the mounting sometimes that assembled to part (3), the mounting portion 3) The rear end portion (7b) located on the non-mating member side (3b) of the mounting portion (3) protrudes from the non-mating member side (3b) of the mounting portion (3), while the tip end portion (7a) of the recess (11 while exposed from the bottom surface (11a) to the other member side (3a) of), said contact surface of the mating member (9) (9a) are assembled such that the non-contact state, the resin molded article after assembly When (1) is bolted to the mating member (9), the tip end portion (7a) of the reinforcing collar (7) is in contact with the contact surface (9a) of the mating member (9) and The rear end (7b) of the collar (7) and the non-mating member side (3b) of the mounting portion (3) are in the same plane.

The invention of claim 2 is the mounting structure of the resin molded article according to claim 1, wherein the at that assembly mounting section (3), the height H2 of the collar for reinforcing, the height H3 of the concave portion The height H1 of the mounting portion around the recess is in a relationship of H1-H3 <H2 ≦ H1.

A third aspect of the present invention, in the mounting structure of the resin molded article according to claim 1 or 2, at that assembled to the mounting portion (3), said contact tip portion and the mating member of the collar reinforcement The distance S from the surface and the protrusion amount T1 of the rear end portion of the reinforcing collar have a relationship of T1 ≦ S.

  According to a fourth aspect of the present invention, in the resin molded product mounting structure according to any one of the first to third aspects, a diameter L1 of the flange portion of the bolt and a diameter L4 of the concave portion satisfy L1 ≦ L4. It is characterized by being.

According to a fifth aspect of the present invention, in the resin molded product mounting structure according to any one of the first to fourth aspects, after the assembly, the resin molded product (1) is bolted to the mating member (9), In a state where the tightening is completed, the mounting portion (3) is compressed and the reinforcing collar (7) is buckled as the screwed state with the flanged bolt (21) advances, and the reinforcing collar (7) is buckled. The front end (7a) of the collar (7) for contact comes into contact with the contact surface (9a) of the mating member (9), and the rear end (7b) of the reinforcing collar (7) is connected to the mounting portion (3). ) In the same plane as the non-partner member side (3b), the height of the mounting portion (3) after compression (H1 in FIG. 3 (d)) and the height of the reinforcing collar (7) after buckling (H2 in FIG. 3D) is the same .

The invention of claim 6 is an assembling method of the mounting structure of the resin molded product according to any one of claims 1 to 5 ,
First, the resin molded product (1) provided with a recess (11) having a depth H3 and a diameter L4 on the counterpart member side (3a) of the mounting portion (3) having a length H1, a length H2, The reinforcing collar (7) having the diameter L2 and the inner diameter L3, the height H2 of the reinforcing collar (7), the height H3 of the recess (11), and the mounting portion around the recess (11) The height H1 in (3) is prepared in a state where H1-H3 <H2 ≦ H1.
The reinforcing collar (7) is press-fitted into the through hole (5) of the mounting portion (3) of the resin molded product (1), and the height T2 of the exposed portion (73) on the counterpart member side (3a), The height (T1) of the projecting portion (71) on the non-partner member side (3b) is set, and the interval S is secured.
Then, the bolt (21) is inserted into the bolt insertion hole (7c) of the reinforcing collar (7), the bolt (21) is screwed into the mating member (9), and the bolt (21 The flange portion (23) of the reinforcing collar (7) is brought into contact with the rear end portion (7b) of the reinforcing collar (7), and the protruding portion (71) and the exposed portion (73) of the reinforcing collar (7) are The mounting portion (3) is in a state where it protrudes from the bottom surface (11a) of the recess (11) to the non-partition member side (3b) and the counterpart member side (3a), The distance S between the contact member 9 and the contact surface 9a is maintained,
Then, the threaded state of the bolt (21) is further advanced, and the rear end (7b) of the reinforcing collar (7) is pushed relative to the mounting portion (3), so that the mounting portion The front end portion (7a) of the reinforcing collar (7), with the non-partner member side (3b) of (3) and the rear end portion (7b) of the reinforcing collar (7) aligned with the same plane. Is not yet in contact with the contact surface (9a) of the counterpart member (9), and is in a state in which a gap S1 (S1 <S) is provided,
Further, the screwing state of the bolt (21) is advanced, and the non-mating member side (3b) of the mounting portion (3) and the rear end portion (7b) of the reinforcing collar (7) are the same. In a state where it matches the plane, the non-mating member side (3b) of the mounting portion (3) and the rear end portion (7b) of the reinforcing collar (7) are connected to the flange portion of the bolt (21) ( 23) and pushed together in the insertion direction to bring the tip (7a) of the reinforcing collar (7) into contact with the contact surface (9a),
Thereafter, the screwing state of the bolt (21) is further advanced, and the non-mating member side (3b) of the mounting portion (3) and the rear end portion (7b) of the reinforcing collar (7) The flange (23) of the bolt (21) is pushed in and tightened to a predetermined tightening torque to compress the non-mating member side (3b) of the mounting portion 3 and to seat the reinforcing collar (7). Bending, the height of the mounting portion (3) after compression (H1 in FIG. 3 (d)) and the height of the reinforcing collar (7) after buckling (H2 in FIG. 3 (d)). The mounting method of the resin molded product (1), which is the same and tightening is completed in this state.

  According to the first aspect of the present invention, the front end portion of the reinforcing collar is exposed and the rear end portion protrudes with respect to the attachment portion, and therefore, when the attachment portion is attached to the mating member by the bolt. The flange portion of the bolt first comes into contact with the protruding portion, and when the bolt is further pushed in, it comes into contact with the non-partner member side (bolt insertion side) of the mounting portion and pushes both the mounting portion and the reinforcing collar. . Then, the tip of the reinforcing collar comes into contact with the contact surface of the mating member and is pushed in. Therefore, it is possible to reduce the tightening torque down and prevent rattling. Further, the exposure amount of the front end portion and the protrusion amount of the rear end portion of the reinforcing collar may be any as long as the above-described assembled state can be obtained. Compared to Document 1, dimensional management is easier.

  According to the second aspect of the present invention, the height H2 of the reinforcing collar, the height H3 of the concave portion, and the height H1 of the mounting portion around the concave portion at the time of assembly are H1−H3 < Since the relationship of H2 ≦ H1 is established, by applying a predetermined tightening torque to the reinforcing collar, the flange portion of the bolt contacts the non-mating member side (bolt insertion side) of the protruding portion of the reinforcing collar and the mounting portion. In contact with each other, both the attachment portion and the reinforcing collar are pushed in, and further, the tip end portion of the reinforcing collar is pushed into contact with the contact surface of the mating member, so that it is difficult to loosen and reliable attachment can be obtained.

  According to the invention described in claim 3, since the protrusion amount T1 of the rear end portion of the reinforcing collar and the interval S between the front end portion of the reinforcing collar and the contact surface of the mating member are in a relationship of T1 ≦ S, By applying a predetermined tightening torque to the reinforcing collar, the flange portion of the bolt is pushed in contact with the protruding portion of the reinforcing collar and the non-mating member side of the mounting portion, and then the reinforcing collar The tip is pushed in contact with the contact surface of the mating member. After that, the reinforcing collar buckles and the portion of the mounting portion that contacts the flange portion is compressed, and the reinforcing collar is screwed to the mating member and fastened to reinforce the mounting portion of the resin molded product. Since the tightening torque is securely borne by the collar, the mounting portion is hard to be damaged and loosened, so that a reliable mounting can be obtained.

  Further, when the reinforcing collar is buckled, the mating member side (non-bolt insertion side) of the mounting portion is retracted from the leading end of the reinforcing collar, so that the contact surface of the mating member and the leading end of the reinforcing collar It is possible to reliably prevent the resin of the mounting portion from being sandwiched therebetween.

  According to the invention of claim 4, since the diameter L1 of the flange portion of the bolt and the diameter L4 of the recess have a relationship of L1 ≦ L4, the non-partner member side of the mounting portion is compressed by the flange portion of the bolt. Even in this case, the concave portion can be a clearance for the compression, so that the non-partner member side of the mounting portion is compressed without difficulty.

According to the invention of claim 5, since the front end portion of the reinforcing collar is exposed and the rear end portion protrudes from the attachment portion, the bolt is attached when the attachment portion is attached to the mating member by the bolt. First, the flange portion comes into contact with the protruding portion, and when the bolt is further pushed in, the flange portion comes into contact with the non-mating member side (bolt insertion side) of the mounting portion, and both the mounting portion and the reinforcing collar are pushed in. Then, the tip of the reinforcing collar comes into contact with the contact surface of the mating member and is pushed in. Therefore, it is possible to reduce the tightening torque down and prevent rattling.

According to the invention of claim 6, since the front end portion of the reinforcing collar is exposed and the rear end portion protrudes with respect to the attachment portion, when the attachment portion is attached to the mating member with the bolt, The flange portion first comes into contact with the protruding portion, and when the bolt is further pushed in, the flange portion comes into contact with the non-mating member side (bolt insertion side) of the mounting portion, and both the mounting portion and the reinforcing collar are pushed in. Then, the tip of the reinforcing collar comes into contact with the contact surface of the mating member and is pushed in. Therefore, it is possible to reduce the tightening torque down and prevent rattling.

  In addition, the flange part of the bolt in this invention means the range which the head part (or flange part) of a bolt or the washer etc. which interpose can contact, Specifically, it was provided integrally with the bolt. The case of a direct flange part and the case where a flange part is comprised with a washer are also included.

  In the present invention, the bolt is screwed to the mating member means that the threaded portion is directly formed on the mating member and the screw portion of the bolt is screwed directly to the mating member; A case in which a similar bolt insertion hole is provided and the screw portion of the bolt that has passed through the mating member is screwed with a nut is also included. In the present invention, the expression that the bolt is fastened to the counterpart member is also used in the same meaning as described above.

It is a perspective view which shows the example which applies the attachment structure of the resin molded product which concerns on embodiment of this invention. It is sectional drawing which expands and shows the principal part of the attachment structure of the resin molded product which concerns on embodiment of this invention. It is the attachment structure of the resin molded product which concerns on embodiment of this invention, Comprising: It is an expanded sectional view explaining the outline of an attachment state in order.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.

  FIG. 1 is a perspective view showing an example in which a resin molded product mounting structure according to an embodiment is applied to a fastening portion between an oil pan and a cylinder block.

  The oil pan P shown in FIG. 1 is a molded product made of synthetic resin, and is attached to the lower part of a cylinder block B made of aluminum alloy and stores lubricating oil that circulates inside the engine. The oil pan P has a cup part P1 for storing lubricating oil, and a mounting flange part P2 extending outward from the upper end opening of the cup part P1. The mounting flange portion P2 is provided with a plurality of bolt holes P3. By inserting bolts into the bolt holes P3 of the oil pan P and screwing the bolts into screw holes (not shown) of the cylinder block B, the oil pan P and cylinder block B are fastened and fixed. In the following description, the oil pan P is the resin molded product 1, the mounting flange portion P2 is the mounting portion 3, the bolt hole P3 is the through hole 5, and the cylinder block B is the counterpart member 9.

  As shown in FIG. 2, an annular through hole 5 (bolt hole P3) is provided in the mounting portion 3 (mounting flange portion P2) of the resin molded product 1 (oil pan P). A cylindrical reinforcing collar 7 is arranged on the inner peripheral surface 5a of the through hole 5 in a close contact state or a joined state. The reinforcing collar 7 is made of an iron-based metal and can be securely fastened between the resin molded product 1 and the reinforcing collar 7 without loosening the resin molded product 1 and the counterpart member 9 and without damaging the resin molded product 1. Thus, any material having higher compressive strength than the resin molded product 1 may be used. The reinforcing collar 7 is not limited to an iron-based metal, and may be, for example, an aluminum alloy, a high-compression strength synthetic resin, or a fiber-reinforced resin. The reinforcing collar 7 has a higher compressive strength than the resin molded product 1, and for example, a ferrous metal material having a high strength resin material or the like is used. The reinforcing collar 7 is provided with a bolt insertion hole 7c, and the bolt 21 with the flange portion 23 is inserted into the bolt insertion hole 7c. A threaded portion 21a made of a male screw of a flanged bolt 21 inserted through the bolt insertion hole 7c of the reinforcing collar 7 is screwed into a female screw 9b formed on the mating member 9 (cylinder block B), so that the resin molded product 1 is formed. Fastened to the mating member 9. The mating member 9 is a member having higher strength than the resin molded product 1.

  The mounting portion 3 has an annular recess 11 larger than the through-hole 5 on the counterpart member side 3a (non-bolt insertion side), concentric with the through-hole 5, and a tip 7a of the reinforcing collar 7 from the bottom surface 11a. It is formed to be exposed.

  The assembly state of the reinforcing collar 7 to the mounting portion 3 will be described. When the reinforcing collar 7 is assembled to the mounting portion 3, the rear end portion 7 b located on the non-partner member side 3 b of the mounting portion 3 is the mounting portion 3. A protruding portion 71 is provided by the protruding rear end portion 7b. Further, on the mating member side 3a of the mounting portion 3, the tip end portion 7a of the reinforcing collar 7 is exposed from the bottom surface 11a of the recess 11 to the contact surface 9a side of the mating member 9, and the exposed tip portion 7a provides an exposed portion 73. The exposed portion 73 of the distal end portion 7a is assembled to the contact surface 9a of the counterpart member 9 so as to be in a non-contact state.

  Then, when the resin molded product 1 is bolted to the mating member 9 after assembly, the front end portion 7a of the reinforcing collar 7 is in contact with the contact surface 9a of the mating member 9, and the rear end portion 7b of the reinforcing collar 7 is It becomes the same plane as the non-partner member side 3b of the attachment portion 3.

  As shown in FIG. 2, when the reinforcing collar 7 is assembled, a height H2 of the reinforcing collar 7, a height H3 of the concave portion 11, and a height H1 of the mounting portion 3 around the concave portion 11 are obtained. , H1-H3 <H2 ≦ H1. H1-H3 is the thickness of the non-partner member side 3b of the attachment portion 3 and the bottom surface 11a of the recess 11.

  Due to this relationship, by applying a predetermined tightening torque to the reinforcing collar 7, the flange portion 23 of the bolt 21 is connected to the protruding portion 71 of the reinforcing collar 7 and the non-partner member side 3 b (bolt). Since both the attachment portion 3 and the reinforcing collar 7 are pushed in, and the tip portion 7a of the reinforcing collar 7 is pushed into contact with the contact surface 9a of the mating member 9, The flange portion 23 of the bolt 21 can be securely brought into close contact with the non-mating member side 3b of the attachment portion 3 and the rear end portion 7b of the reinforcing collar 7, and the bolt 21 and the attachment portion 3 exert a pressing force on each other. Since it can be set as an attachment, the attachment is not easily affected by vibration or the like and is not loosened.

  At the time of assembly, the distance S between the front end portion 7a of the reinforcing collar 7 and the contact surface 9a of the mating member 9 and the protruding amount T1 of the rear end portion 7b of the reinforcing collar 7 have a relationship of T1 ≦ S. It is preferable.

  Due to this relationship, a predetermined tightening torque is applied to the reinforcing collar 7 so that the flange portion 23 of the bolt 21 is connected to the protruding portion 71 of the reinforcing collar 7 and the non-partner member side 3b of the mounting portion 3 (bolt insertion side). The tip 7a of the reinforcing collar 7 is pushed in contact with the contact surface 9a of the mating member 9. Thereafter, the reinforcing collar 7 is buckled and the portion of the mounting portion 3 that contacts the flange portion 23 is compressed, and the reinforcing collar 7 is screwed into the mating member 9 and fastened. Therefore, since the tightening torque is reliably borne by the mounting portion 3 of the resin molded product 1 and the reinforcing collar 7, it is possible to obtain a reliable mounting in which the mounting portion 3 is not easily damaged and loosened. Further, when the reinforcing collar 7 is buckled, the bottom surface 11a of the recess 11 is retracted from the distal end portion 7a of the reinforcing collar 7 to the mating member side 3a (non-bolt insertion side) of the mounting portion 3. It is possible to reliably prevent the resin of the mounting portion 3 from being sandwiched between the contact surface 9a and the distal end portion 7a of the reinforcing collar 7.

  The diameter L1 of the flange portion 23 of the bolt 21 and the diameter L4 of the recess 11 are preferably in a relationship of L1 ≦ L4. In this way, even when the non-mating member side 3b (bolt insertion side) of the mounting portion 3 is pressed by the flange portion 23 of the bolt 21, the concave portion 11 reduces the excessive load of the pressing force. The non-mating member side 3b (bolt insertion side) of the mounting portion 3 is pressed and compressed.

  The volume by which the non-mating member side 3b of the mounting portion 3 is pushed in by the flange portion 23 of the bolt 21 is Y1, the volume of the recessed portion 11 is Y2, the volume of the exposed portion 73 of the reinforcing collar 7 is Y3, and the cavity volume of the recessed portion 11 is Y4. It is preferable that Y1 ≦ Y4 and Y4 = Y2−Y3. Because of this relationship, even when the non-mating member side 3b (bolt insertion side) of the mounting portion 3 is compressed by the flange portion 23 of the bolt 21, the concave portion 11 can be a clearance for the compression. The non-mating member side 3b (bolt insertion side) of the mounting portion 3 is compressed.

  Next, the assembled state will be described with reference to FIGS. Note that the screw portion 21a of the bolt 21 is omitted, and only the flange portion 23 is shown.

  First, a resin molded product 1 provided with a recess 11 having a depth H3 and a diameter L4 on the counterpart member side 3a of the attachment portion 3 having a length H1, and a reinforcing collar 7 having a length H2, an outer diameter L2, and an inner diameter L3, Prepare. Then, the reinforcing collar 7 is press-fitted into the through-hole 5 of the mounting portion 3 of the resin molded product 1 from the non-partner member side 3b without the recess 11 and is fitted. At this time, the reinforcing collar 7 has a height T2 of the exposed portion 73 on the counterpart member side 3a and a height T1 of the protruding portion 71 on the non-mate member side 3b with respect to the attachment portion 3, and the interval S is secured. To. As a result, it is sufficient that the reinforcing collar 7 protrudes slightly in either direction. Therefore, dimensional management is easier than in the above-mentioned Patent Document 1.

  Then, the bolt 21 is inserted into the bolt insertion hole 7 c of the reinforcing collar 7, and the screw portion 21 a of the bolt 21 is screwed into the female screw 9 b of the mating member 9. As a result, as shown in FIG. 3A, the flange portion 23 of the bolt 21 contacts the rear end portion 7 b of the reinforcing collar 7. In this state, the protruding portion 71 and the exposed portion 73 of the reinforcing collar 7 are respectively connected to the bottom surface 11a of the recess 11 on the non-mate member side 3b (bolt insertion side) and the counterpart member side 3a (non-bolt insertion side) of the attachment portion 3, respectively. The distance S between the tip 7a of the reinforcing collar 7 and the contact surface 9a of the mating member 9 is maintained.

  When the screwing state is further advanced, as shown in FIG. 3 (b), the rear end portion 7b of the reinforcing collar 7 is pushed relative to the mounting portion 3, and the non-partner side 3b of the mounting portion 3 is pressed. (Bolt insertion side) and the rear end portion 7b of the reinforcing collar 7 coincide with the same plane. Note that the portion of the mounting portion 3 that is in close contact with the reinforcing collar 7 also moves together as the reinforcing collar 7 advances in the screwing direction. When the non-mating member side 3b (bolt insertion side) of the mounting portion 3 and the rear end portion 7b of the reinforcing collar 7 coincide with the same plane, the leading end portion 7a of the reinforcing collar 7 is still on the mating member 9. The contact surface 9a is not contacted, and the interval S1 (S1 <S) is provided.

  Then, when further tightening torque is applied and the bolt 21 is pushed in the approaching direction, as shown in FIG. 3C, the non-partner member side 3b (bolt insertion side) of the mounting portion 3 and the rear end of the reinforcing collar 7 The portion 7b is pushed by the flange portion 23 of the bolt 21 and advances together in the insertion direction. At this time, the reinforcing collar 7 has not yet buckled, and proceeds in the entering direction until the tip 7a of the reinforcing collar 7 contacts the contact surface 9a. In this case, the non-partner member side 3b of the mounting portion 3 is slightly compressed. Has been. The compression allowance S2 at this time is substantially the same as the interval S1.

  In the state of FIG. 3 (b), the interval S1 = 0, the tip 7a of the reinforcing collar 7 contacts the contact surface 9a of the mating member 9, and the non-mating member side 3b (bolt insertion side) of the mounting portion 3 ) And the rear end portion 7b of the reinforcing collar 7 may coincide with the same plane. In this case, there is no state in FIG. 3C, and the compression allowance S2 = 0. In addition, in this way, rather than managing the dimensions to S1 = 0 and S2 = 0, the dimensions are managed so that S1≈S2> 0, and in some cases, S1 = 0 and S2 = 0. It is more advantageous in terms of management.

  When further tightened to a predetermined tightening torque, the non-partner member side 3b of the mounting portion 3 is further compressed and the reinforcing collar 7 is buckled. At this time, the compression allowance S3 of the attachment portion 3 has a relationship of S3> S2, the reinforcing collar 7 is buckled, and the non-mating member side 3b of the attachment portion 3 is compressed. The mounting portion 3 and the reinforcing collar 7 can bear the tightening of the bolt 21 by the flange 23.

  In addition, at this time, although it is estimated that the recessed part 11 has become a little narrow by compression of the attachment part 3, since it is not constant in shape, it showed typically in FIG.3 (d). In particular, this narrowing situation varies depending on the material of the resin molded product 1, the size of the recess 11, the tightening torque, and the like, and in some cases it may not be narrowed. A space was provided.

  Since the tightening is completed in this state, the resin molded product 1 is securely fastened to the mating member 9 without loosening. At the same time, since the dimensional accuracy and mounting accuracy are not required so that at least one surface of the mounting portion 3 of the resin molded product 1 and the reinforcing collar 7 are the same plane, the management of the dimensional control and the assembly accuracy is relatively low. Easy.

(Other embodiments)
The concave portion 11 has a cylindrical cross section having a bottom surface and a depth, but may have other shapes, for example, an inclined surface whose diameter gradually decreases from the mating surface side toward the non-mating surface side, If it sees, it is good also as a trapezoid or a triangular recessed part.

  The present invention is applicable as long as the resin molded product is fastened to a mating member having a higher strength than the resin molded product. For automotive parts, an oil pan, a head cover, an oil strainer, a timing belt cover, and the like can be cited. It is done.

B Cylinder block P Oil pan 1 Plastic molded product 3 Mounting part 3a Mating member side (non-bolt insertion side)
3b Non-partner side (bolt insertion side)
5 Through-hole 5a Inner peripheral surface 7 Reinforcing collar 7a Front end 7b Rear end 7c Bolt insertion hole 71 Protruding portion 73 Exposed portion 9 Member 9a Contact surface 9b Female thread 11 Recessed portion 11a Bottom surface 21 Bolt 21a Screw portion 23 Flange portion (Washer) )
L1 Flange diameter L2 Collar outer diameter L3 Collar inner diameter L4 Concave diameter H1 Resin molded product height H2 Reinforcing collar height H3 Concave height T1 Protruding amount of rear end (projecting height)
T2 Exposed height of exposed part S Interval

Claims (6)

A cylindrical reinforcing collar (7) having a bolt insertion hole (7c) on the inner peripheral surface (5a) of the annular through hole (5) provided in the mounting portion (3) of the resin molded product (1). The flanged bolt (21), which is disposed in a close contact state or in a joined state and is inserted into the bolt insertion hole (7c) of the reinforcing collar (7), is screwed into the mating member (9), thereby the resin molded product. A mounting structure for a resin molded product (1) in which (1) is bolted to a mating member (9),
An annular recess that is exposed to the tip (7a) of the reinforcing collar (7) from the bottom surface (11a) and is larger than the through hole (5) on the mating member side (3a) of the mounting portion (3). (11) is formed on the periphery of the through hole (5),
The flanged bolt (21) includes a flange portion (23) that comes into contact with the rear end portion (7b) of the reinforcing collar (7) and the non-mating member side (3b) of the mounting portion (3).
The reinforcing collar (7), sometimes that assembled to the mounting portion (3), the rear end portion positioned on the non-mating member side of the attachment portion (3) (3b) is (7b) the mounting portion (3) The tip (7a) is exposed from the bottom surface (11a) of the recess (11) to the counterpart member side (3a) while protruding from the non-mate member side (3b) of the counterpart member (9). The surface (9a) is assembled in a non-contact state,
When the resin molded product (1) is bolted to the mating member (9) after assembly, the tip (7a) of the reinforcing collar (7) contacts the contact surface (9a) of the mating member (9). And the rear end portion (7b) of the reinforcing collar (7) and the non-mating member side (3b) of the mounting portion (3) are in the same plane. Mounting structure. In the mounting structure of the resin molded product (1) according to claim 1,
Said at that assembly mounting section (3), the height H2 of the reinforcement collar (7), the height H3 of the concave portion (11), said recess (11) the mounting portion around (3) The mounting structure of the resin molded product (1), wherein the height H1 is in a relationship of H1−H3 <H2 ≦ H1. In the mounting structure of the resin molded product (1) according to claim 1 or 2,
Sometimes that assembling the attachment part (3), said distal end portion of the reinforcing collar (7) (7a) and the contact surface of the mating member (9) and spacing S of (9a), the reinforcing collar (7) The protruding structure T1 of the rear end portion (7b) has a relationship of T1 ≦ S, and the mounting structure for the resin molded product (1). In the mounting structure of the resin molded product (1) according to any one of claims 1 to 3,
The resin molded product (1) mounting structure, wherein a diameter L1 of the flange portion (23) of the bolt (21) and a diameter L4 of the recess (11) are in a relationship of L1 ≦ L4. In the mounting structure of the resin molded product (1) according to any one of claims 1 to 4,
After assembly, in the state where the resin molded product (1) is bolted to the mating member (9) and tightening is completed, the screwed state to the flanged bolt (21) proceeds, whereby the mounting portion ( 3) is compressed and the reinforcing collar (7) is buckled, and the tip (7a) of the reinforcing collar (7) comes into contact with the contact surface (9a) of the mating member (9). The rear end portion (7b) of the reinforcing collar (7) is in the same plane as the non-mating member side (3b) of the attachment portion (3), and the height and seat of the attachment portion (3) after compression The mounting structure of the resin molded product (1) , wherein the height of the reinforcing collar (7) after bending is the same . A method for assembling a mounting structure for a resin molded product (1) according to any one of claims 1 to 5 ,
First, the resin molded product (1) provided with a recess (11) having a depth H3 and a diameter L4 on the counterpart member side (3a) of the mounting portion (3) having a length H1, a length H2, The reinforcing collar (7) having the diameter L2 and the inner diameter L3, the height H2 of the reinforcing collar (7), the height H3 of the recess (11), and the mounting portion around the recess (11) The height H1 in (3) is prepared in a state where H1-H3 <H2 ≦ H1.
The reinforcing collar (7) is press-fitted into the through hole (5) of the mounting portion (3) of the resin molded product (1), and the height T2 of the exposed portion (73) on the counterpart member side (3a), The height (T1) of the projecting portion (71) on the non-partner member side (3b) is set, and the interval S is secured.
Then, the bolt (21) is inserted into the bolt insertion hole (7c) of the reinforcing collar (7), the bolt (21) is screwed into the mating member (9), and the bolt (21 The flange portion (23) of the reinforcing collar (7) is brought into contact with the rear end portion (7b) of the reinforcing collar (7), and the protruding portion (71) and the exposed portion (73) of the reinforcing collar (7) are The mounting portion (3) is in a state where it protrudes from the bottom surface (11a) of the recess (11) to the non-partition member side (3b) and the counterpart member side (3a), The distance S between the contact member 9 and the contact surface 9a is maintained,
Then, the threaded state of the bolt (21) is further advanced, and the rear end (7b) of the reinforcing collar (7) is pushed relative to the mounting portion (3), so that the mounting portion The front end portion (7a) of the reinforcing collar (7), with the non-partner member side (3b) of (3) and the rear end portion (7b) of the reinforcing collar (7) aligned with the same plane. Is not yet in contact with the contact surface (9a) of the counterpart member (9), and is in a state in which a gap S1 (S1 <S) is provided,
Further, the screwing state of the bolt (21) is advanced, and the non-mating member side (3b) of the mounting portion (3) and the rear end portion (7b) of the reinforcing collar (7) are the same. In a state where it matches the plane, the non-mating member side (3b) of the mounting portion (3) and the rear end portion (7b) of the reinforcing collar (7) are connected to the flange portion of the bolt (21) ( 23) and pushed together in the insertion direction to bring the tip (7a) of the reinforcing collar (7) into contact with the contact surface (9a),
Thereafter, the screwing state of the bolt (21) is further advanced, and the non-mating member side (3b) of the mounting portion (3) and the rear end portion (7b) of the reinforcing collar (7) The flange (23) of the bolt (21) is pushed in and tightened to a predetermined tightening torque to compress the non-mating member side (3b) of the mounting portion 3 and to seat the reinforcing collar (7). Bending, the height of the mounting portion (3) after compression is the same as the height of the reinforcing collar (7) after buckling, and tightening is completed in this state. A mounting method of the resin molded product (1) characterized.

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