JP2015031300A - Resin part fitting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin part fitting structure in which a bolt is hardly loosened even if creep phenomena occur.SOLUTION: A reinforcement collar 4 is press fitted into a through-pass hole 3a of an oil strainer. The reinforcement collar 4 protrudes out of a protruding end of an annular protrusion part 3b. A counter-annular protrusion part 3b of a flange part 3 of the oil strainer is overlapped on a main body part 10 in such a way that an insertion hole 4a may correspond to a threaded hole 10a, a shaft part 5a of a bolt 5 is inserted into the insertion hole 4a under this state and it is threadably fitted to the threaded hole 10a. The reinforcement collar 4 is compressed and deformed by the circumferential edge of the threaded hole 10a of the main body part 10 and a head part 5b of the bolt 5 and at the same time the counter-annular protrusion part 3b is plastically deformed by the head part 5b of the bolt 5 and the oil strainer is fixed to the main body part 10.

Description

  The present invention relates to a mounting structure for mounting a resin component to a mounted body with a bolt.

 Conventionally, many resin parts are applied to automobiles in order to achieve both weight reduction and cost reduction, and each resin part may be attached to a body to be attached to each part of the automobile using bolts. The mounting part of each resin part to the body to be mounted is cylindrical because the load is repeatedly applied by vibrations generated during engine rotation or running, and the resin in the mounting part may be deformed by the creep phenomenon to loosen the bolt. In general, the resin part is attached to the attachment body with a bolt through the reinforcing collar.

  By the way, when a resin part is attached to a mounted body with a bolt via a reinforcing collar, if a gap is generated between the head of the bolt and the resin part via the reinforcing collar, the resin part will be rattled. Therefore, it is necessary to eliminate the gap between the bolt head and the resin component when the resin component is attached to the mounted body.

  In order to deal with this, for example, in the resin component mounting structure disclosed in Patent Document 1, a screw hole is formed in the body to be screwed into which a shaft portion of a bolt is screwed. A through hole into which the collar is press-fitted is formed, and the reinforcing collar has a through hole through which the shaft portion of the bolt is inserted. A plurality of radially extending protrusions are provided at equal intervals along the periphery of the opening on the opposite side of the through-attachment body side of the through hole, and the resin component is disposed so that the insertion hole corresponds to the screw hole. In the state of being overlapped with the mounted body, the shaft portion of the bolt is inserted into the insertion hole and screwed into the screwing hole, so that each protrusion is plastically deformed at the head of the bolt, and the mounted body A resin part is attached to the attachment body by sandwiching a reinforcing collar between the periphery of the screw hole and the head of the bolt.

Japanese Patent Laid-Open No. 11-59337

  However, in Patent Document 1, since each protrusion extends radially, when each protrusion is plastically deformed when the resin component is attached to the attached body with a bolt, each protrusion on the head of the bolt is deformed. The load will be applied to the corresponding parts. Then, when the creep phenomenon occurs, the deformation of the resin part occurs unevenly, and there is a possibility that the progress of loosening of the bolt may be accelerated.

  In addition, each ridge extends outward from the peripheral edge of the opening of the through hole, and the height of the protruding portion protrudes from the end of the reinforcing collar, so when screwing the bolt into the screwing hole, The head of the bolt comes into contact with each protrusion before the end of the reinforcing collar. Then, the resin of each projecting ridge that undergoes plastic deformation enters between the head of the bolt and the reinforcing collar, and when creep occurs, the resin enters between the head of the bolt and the reinforcing collar. May be deformed to promote loosening of the bolt.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a mounting structure for a resin component in which a bolt is not easily loosened even if a creep phenomenon occurs.

  In order to achieve the above object, the present invention is characterized in that the shape of the portion of the resin component that contacts the head of the bolt is devised.

  That is, in the first invention, an attached body having a screw hole into which a shaft portion of a bolt is screwed, a cylindrical reinforcing collar having an insertion hole through which the shaft portion of the bolt is inserted, and the reinforcing collar. A resin part having a mounting part in which a press-fitting through-hole is formed, and an annular protrusion is provided on the periphery of the through-hole on the side opposite to the attachment body, and the length of the reinforcing collar in the cylinder center direction is provided. The insertion hole is set to be longer than the thickness of the mounting portion, and the insertion hole is inserted into the screwing hole in a state where the reinforcing collar is press-fitted into the through-hole so as to protrude from the protruding end of the annular protrusion. By overlapping the anti-annular ridge portion side of the mounting portion on the mounted body so as to correspond, by inserting the shaft portion of the bolt into the insertion hole in this state, and screwing into the screwing hole, The reinforcing collar is attached to the periphery of the screw hole of the mounted body and the head of the bolt. Causes compressive deformation in the, the head of the bolt by plastically deforming the annular ridge portion, characterized in that to attach the resin component in the the attached body.

In the second invention, in the first invention, the volume V _a of the annular ridge has a volume the reinforcing collar when screwing the bolt to the Nishigoana is compressed and deformed when the V _b , V _a ≦ V _b is set.

  In the third invention, in the first or second invention, the annular protrusion is set to satisfy h / w ≦ 1, where h is the protrusion height and w is the width of the protrusion. It is characterized by.

  In a fourth invention, in any one of the first to third inventions, the length L in the tube center direction of the reinforcing collar is set to satisfy L ≧ E + h, where E is the thickness of the mounting portion. It is characterized by being.

  According to a fifth invention, in any one of the first to fourth inventions, the reinforcing collar is made of a material having a higher compressive strength than the mounting portion.

  In the first invention, when the bolt is tightened, the annular protrusion that is plastically deformed at the head of the bolt is continuous along the opening periphery of the through hole. The applied force becomes uniform at the periphery of the through hole. Therefore, even if the creep phenomenon occurs, it is possible to prevent the resin from being deformed at the periphery of the through hole, and the bolt from being loosened quickly due to the uneven deformation of the resin at the periphery of the through hole. Further, when the bolt is tightened, the head of the bolt comes into contact with the reinforcing collar before the annular protruding portion, so that the resin of the annular protruding portion that is plastically deformed is between the bolt head and the reinforcing collar. It is possible to prevent the bolt from loosening due to the creep phenomenon that the resin that has entered between the head of the bolt and the reinforcing collar does not enter.

  In the second invention, the ratio contributing to the tightening torque of the plastically deformed annular ridge is smaller than the ratio contributing to the tightening torque of the compression collar that has been compressively deformed, and is less than about half of the entire tightening torque. Therefore, even if the resin of the annular ridge portion is deformed by the creep phenomenon and the tightening torque is reduced, the decrease in the tightening torque can be suppressed to about half or less.

  In 3rd invention, when the width w of the protrusion part of an annular ridge part is too small with respect to height h, when tightening a bolt, the annular ridge part which contacts the head of a bolt will bend and break. And there is no failure during use.

  In the fourth invention, when the bolt is tightened, after the head portion of the bolt comes into contact with the peripheral edge of the one end opening of the reinforcing collar and before it comes into contact with the annular protrusion, the peripheral edge of the other end opening of the reinforcing collar is attached To come into contact. Therefore, when the head of the bolt plastically deforms the annular protrusion, the peripheral edge of the other end opening of the reinforcing collar is in contact with the mounted body. It is possible to prevent the bolt from loosening due to the creep phenomenon that the resin that has entered between the reinforcing collar and the attached body does not enter between the collar and the attached body.

  In the fifth aspect of the invention, when the creep phenomenon occurs, the reinforcing collar is less likely to be deformed than around the through hole of the resin component, so that the fixing of the resin component to the mounted body can be reliably maintained. .

FIG. 3 is an exploded perspective view before attaching a reinforcing collar to the oil strainer according to the first embodiment. (A) is sectional drawing in the AA of FIG. 1, (b) is sectional drawing in the BB line of (a). FIG. 2A is a view corresponding to FIG. 2A and shows a state immediately after the bolt tightening operation is started. FIG. 2A is a view corresponding to FIG. 2A and shows a state in the middle of bolt tightening work. FIG. 2A is a view corresponding to FIG. 2A and shows a state immediately after the bolt tightening operation is completed. FIG. 5 is a diagram corresponding to FIG. 4 of Embodiment 2.

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.
Embodiment 1 of the Invention
FIG. 1 shows a resin oil strainer 1 (resin component) to which a mounting structure according to Embodiment 1 of the present invention is applied. The oil strainer 1 is disposed in an oil pan (not shown) of an automobile engine and is used as a part of a lubrication path of the engine.

  The oil strainer 1 has a substantially rectangular parallelepiped shape that extends horizontally, and a pump of a main body (attached body) 10 (shown in FIGS. 2 to 5) of an engine is disposed at one upper end of the oil strainer 1. A connecting portion 1a having an outlet 2a connected to the oil strainer 1 is provided, and a substantially cylindrical oil suction portion 1b having a suction port 2b for sucking oil is provided at the other lower end of the oil strainer 1.

  The oil strainer 1 is hollow and has a filter (not shown). The oil stored in the oil pan is sucked from the suction port 2b and filtered through the filter. Supply to the lubrication path.

  The connecting portion 1a is a portion bent in an L shape on one side in the longitudinal direction of the oil strainer 1, and the oil strainer 1 is attached to the main body portion 10 of the engine around the outlet 2a of the connecting portion 1a. A pair of flange portions (mounting portions) 3 are formed on the opposite side of 180 ° across the outlet 2a.

  The flange portion 3 has a plate shape with a thickness E protruding in the width direction of the oil strainer 1 and has a substantially diamond shape when viewed in the central axis direction of the outlet 2a.

  A through hole 3a that is parallel to the central axis of the outlet 2a is formed in the approximate center of the flange portion 3, and one opening peripheral edge of the through hole 3a (opening peripheral edge on the opposite side of the main body part 10) is formed. As shown in FIGS. 2 (a) and 2 (b), an annular protrusion 3b is provided.

  The annular protrusion 3b is set so that the height of the protruding portion is h, the width of the protruding portion is w, and h = w is satisfied (see FIG. 4). In the first embodiment, the annular ridge 3b is set so that h = w. However, since the annular ridge 3b has a small structure, h = w may be h = w due to a manufacturing error. It shall be included in w.

The annular ridge portion 3b volume V _a, when the cross-sectional area in a direction perpendicular to the center line direction of the through hole 3a and S _a, is guided by V a ₌ S _a × h, of the annular ridge portion 3b The peripheral surface is flush with the inner peripheral surface of the through hole 3a.

  A short cylindrical aluminum alloy reinforcing collar 4 having an insertion hole 4a can be press-fitted into the through hole 3a.

  The length L in the cylinder center direction of the reinforcing collar 4 is set to be longer than the thickness E of the flange portion 3, and the reinforcing collar 4 can be compressed and deformed in the cylinder center direction.

  The oil strainer 1 is fixed to the main body 10 of the engine with bolts 5.

  The bolt 5 includes a shaft portion 5a that can be inserted into the insertion hole of the reinforcing collar 4 and a head portion 5b that is continuous to the shaft portion 5a. A flange plate is provided on the shaft portion 5a side of the head portion 5b. 5c is provided. The flange plate 5c of the present embodiment is integrated with the bolt 5, but a flange plate (washer) that is a separate body from the bolt 5 is also defined as a part of the head 5b.

  Further, a screw hole 10a into which the shaft portion 5a of the bolt 5 is screwed is formed in a recessed manner at a position where the oil strainer 1 is attached to the main body portion 10.

  Then, the reinforcing collar 4 is press-fitted into the through-hole 3a from the upper opening (opening on the side opposite to the bolt 5 insertion side) so as to protrude from the projecting end of the annular ridge 3b, and in this state, the insertion The anti-annular ridge portion 3b side of the flange portion 3 of the oil strainer 1 is overlapped with the main body portion 10 so that the hole 4a corresponds to the screwing hole 10a.

  Further, the shaft portion 5a of the bolt 5 is inserted into the insertion hole 4a while the flange portion 3 of the oil strainer 1 is overlapped with the main body portion 10 of the engine, and is then screwed into the screwing hole 10a. 4 is compressed and deformed by the periphery of the screw hole 10a of the main body 10 and the head 5b of the bolt 5, and the annular ridge 3b is plastically deformed by the head 5b of the bolt 5 so that the oil strainer 1 is attached to the main body 10. It is designed to be attached.

Further, the length L in the cylinder center direction of the reinforcing collar 4 is defined as K _{t when the} deformation length of the reinforcing collar 4 is compressed and deformed when the bolt 5 is tightened with a set tightening torque. It is set to satisfy L−K _t ≦ E + h. By setting in this manner, the anti-annular ridge portion 3b side of the flange portion 3 contacts the main body portion 10 with the bolt 5 tightened, and the head portion 5b of the bolt 5 contacts the annular ridge portion 3b. The backlash of the oil strainer 1 can be reliably eliminated.

Then, the volume V _a of the annular ridge portion 3b, when the volume of the reinforcement collar 4 is compressed and deformed when screwing the bolt 5 into the Nishigoana 10a and V _b, the V _a ≦ V _b It is set to meet.

2 to 4, the height h and width w of the protruding portion of the annular ridge 3b and the length L in the cylinder center direction of the reinforcing collar 4 are exaggerated for easy understanding. The height h and width w of the protruding portion are, for example, about h = 0.3 to 1.7 mm and w = 0.3 to 1.7 mm, and are in the direction of the center of the cylinder of the reinforcing collar 4. compressive deformation length _{K t} is about 0.2 to 0.3 mm. Further, the _{V b,} when the direction of the sectional area _{S b} that is perpendicular to the cylinder center direction of the reinforcing collar _4, is guided by _{V b = S b × K t} .

  Furthermore, the height h and the width w of the projecting portion of the annular ridge 3b are preferably h = w, but h / w ≦ 1 is sufficient. That is, when the height h of the protruding portion such as h / w> 1 becomes too large with respect to the width w, the head 5b of the bolt 5 comes into contact with the annular protrusion 3b when the bolt 5 is tightened. This is because the protrusion 3b is broken and broken.

  Next, attachment of the oil strainer 1 to the main body 10 of the engine will be described.

  First, the oil strainer 1 is prepared, and the reinforcing collar 4 is press-fitted into the through hole 3a of the flange portion 3 of the oil strainer 1 from the upper opening (the opening on the side opposite to the bolt 5), as shown in FIG. The reinforcing collar 4 is protruded from the projecting end of the annular ridge 3b.

  Next, as shown in FIG. 3, the anti-annular ridge portion 3b side of the flange portion 3 of the oil strainer 1 is overlapped with the lower surface of the main body portion 10 so that the insertion hole 4a corresponds to the screwing hole 10a. 5 is inserted into the insertion hole 4 a and screwed into the screw hole 10 a, and the flange plate 5 c of the bolt 5 is brought into contact with the lower peripheral edge of the reinforcing collar 4.

  When the bolt 5 is further tightened, as shown in FIG. 4, the head portion 5b of the bolt 5 pushes the reinforcing collar 4 into the through hole 3a and contacts the protruding end of the annular ridge 3b, and The opening periphery of the upper portion of the reinforcing collar 4 comes into contact with the periphery of the screw hole 10a of the main body 10.

  When the bolt 5 is further tightened, as shown in FIG. 5, the reinforcing collar 4 is compressed and deformed by the periphery of the screwing hole 10a of the main body 10 and the head 5b of the bolt 5, and the annular protrusion 3b is formed. The oil strainer 1 is attached to the main body 10 of the engine by being plastically deformed by the head 5b of the bolt 5.

  As described above, according to the first embodiment of the present invention, when the bolt 5 is screwed into the screwing hole 10a, the annular protrusion 3b that is plastically deformed by the head 5b of the bolt 5 follows the opening periphery of the through hole 3a. Therefore, the force applied to the head 5b of the bolt 5 with the bolt 5 tightened is uniform at the periphery of the through hole 3a. Therefore, even if a creep phenomenon occurs, it is possible to prevent the deformation of the resin at the periphery of the through-hole 3a from being biased, and the deformation of the resin at the periphery of the through-hole 3a being biased to prevent the bolt 5 from proceeding more slowly.

  Further, when the bolt 5 is tightened, the head 5b of the bolt 5 comes into contact with the reinforcing collar 4 before the annular protrusion 3b, so that the resin of the annular protrusion 3b that is plastically deformed is the head 5b of the bolt 5. And the reinforcement collar 4 is prevented from entering the space between the head 5b of the bolt 5 and the reinforcement collar 4 and preventing the bolt 5 from loosening due to the creep phenomenon. Can do.

  Further, the proportion of the annular deformed annular protrusion 3b that contributes to the tightening torque is smaller than the proportion that contributes to the tightening torque of the compression collar 4 that has undergone compression deformation, and is less than about half of the entire tightening torque. Even if the resin of the annular ridge portion 3b is deformed by the creep phenomenon and the tightening torque is reduced, the decrease in the tightening torque can be suppressed to about half or less.

  In addition, the width w of the projecting portion of the annular ridge 3b is too small with respect to the height h, and when the bolt 5 is tightened, the annular ridge 3b contacting the head 5b of the bolt 5 is broken and broken. It is possible to make the mounting structure without any trouble during use.

Since the reinforcing collar 4 has a higher compressive strength than the flange portion 3, when the creep phenomenon occurs, the reinforcing collar 4 is more difficult to deform than the flange portion 3 of the oil strainer 1, and the main body portion 10. The oil strainer 1 can be reliably fixed.
<< Embodiment 2 of the Invention >>
FIG. 6 shows an attachment structure according to Embodiment 2 of the present invention. In the second embodiment, only the structure of the reinforcing collar 4 is different from that of the first embodiment, and the others are the same as those of the first embodiment. Therefore, only the parts different from the first embodiment will be described below.

  That is, the length L in the cylinder center direction of the reinforcing collar 4 of the second embodiment is set so as to satisfy L ≧ E + h. Therefore, when the bolt 5 is tightened, the head 5b of the bolt 5 is After contacting the lower opening periphery (one end opening periphery) and before contacting the annular protrusion 3b, the upper opening periphery (the other end opening periphery) of the reinforcing collar 4 comes into contact with the main body 10. . Therefore, when the head 5b of the bolt 5 plastically deforms the annular protrusion 3b, the upper opening periphery (the other end opening periphery) of the reinforcing collar 4 is in contact with the main body portion 10, and thus the through hole 3a. The resin around the opening on the main body 10 side does not enter between the reinforcing collar 4 and the main body 10, and the resin that enters between the reinforcing collar 4 and the main body 10 is deformed by a creep phenomenon and is bolted. It can prevent that 5 loosens.

  In the first and second embodiments of the present invention, the reinforcing collar 4 is press-fitted into the through hole 3a from the upper opening (the opening on the side opposite to the bolt 5), so that the resin on the inner peripheral surface of the through hole 3a is In the state before the bolt 5 is tightened, it is pulled downward (the bolt 5 insertion side). Therefore, when the bolt 5 is tightened, if the reinforcing collar 4 is pushed into the through hole 3a with the head 5b of the bolt 5, the resin on the inner peripheral surface of the through hole 3a is not pulled downward (the bolt 5 insertion side). When the reinforcing collar 4 is pushed into the through-hole 3a, the resin on the inner peripheral surface of the through-hole 3a moves upward (on the side opposite to the bolt 5) and moves between the reinforcing collar 4 and the main body portion 10. It is difficult for things to get in between.

  In the first and second embodiments of the present invention, the reinforcing collar 4 is press-fitted into the through hole 3a from the upper opening (opening on the side opposite to the bolt 5), but the lower opening (bolt 5) of the through hole 3a. You may press-fit from the opening of the insertion side.

  In Embodiments 1 and 2 of the present invention, the reinforcing collar 4 is formed of an aluminum alloy. However, the present invention is not limited to this, and the reinforcing collar 4 may be formed of a steel material. Any material having higher compressive strength than the flange portion 3 (around the through hole 3a) of the strainer 1 may be used.

  In the first and second embodiments of the present invention, the projecting end of the annular ridge 3b is formed flat, but several notches are formed on the projecting end of the annular ridge 3b, or the annular ridge 3b. Even if the protruding end of the portion 3b is slightly curved in the circumferential direction, the effect of the present invention is not affected.

  The present invention is suitable for an attachment structure in which a resin component is attached to an attached body with a bolt.

1 Oil strainer (resin parts)
3 Flange part (mounting part)
3a Through-hole 3b Annular ridge 4 Reinforcing collar 4a Insertion hole 5 Bolt 5a Shaft 5b Head 10 Main body (attachment)
10a Screw-in hole L Length of reinforcing collar in the center of the cylinder E Thickness of flange part of oil strainer h Height of projecting part of annular projecting part w Width of projecting part of annular projecting part

Claims (5)

An attached body (10) having a screw hole (10a) into which a shaft (5a) of the bolt (5) is screwed;
A cylindrical reinforcing collar (4) having an insertion hole (4a) through which the shaft (5a) of the bolt (5) is inserted;
A resin part (1) having a mounting portion (3) in which a through hole (3a) for press-fitting the reinforcing collar (4) is formed;
An annular ridge (3b) projects from the periphery of the through-hole (3a) on the side opposite to the attachment body (10).
The length (L) in the cylinder center direction of the reinforcing collar (4) is set to be longer than the thickness (E) of the mounting portion (3),
The insertion hole (4a) is inserted into the threaded hole (10a) in a state where the reinforcing collar (4) is press-fitted into the through hole (3a) so as to protrude from the protruding end of the annular protrusion (3b). The anti-annular ridge (3b) side of the mounting portion (3) is overlapped with the mounted body (10) so as to correspond, and in this state, the shaft portion (5a) of the bolt (5) is inserted into the insertion hole (4a). ) And screwed into the threaded hole (10a), the reinforcing collar (4) is inserted into the threaded hole (10a) periphery of the mounted body (10) and the bolt (5). And the head (5b) of the bolt (5) is plastically deformed by the head (5b) of the bolt (5) to deform the resin component ( 1) mounting structure for resin parts, characterized in that it is mounted. In the mounting structure of the resin component according to claim 1,
The volume V _a of the annular ridge portion (3b), when the volume of the reinforcing collar (4) is compressed and deformed the bolt (5) when screwing in the Nishigoana (10a) and V _b , V _a ≦ V _b is set. In the resin component mounting structure according to claim 1 or 2,
The resin component mounting structure according to claim 1, wherein the annular ridge (3b) is set to satisfy h / w ≦ 1, where h is the height of the protruding portion and w is the width. In the mounting structure of the resin component according to any one of claims 1 to 3,
The length L in the cylinder center direction of the reinforcing collar (4) is set so as to satisfy L ≧ E + h, where E is the thickness of the mounting portion (3). . In the resin component mounting structure according to any one of claims 1 to 4,
The mounting structure for resin parts, wherein the reinforcing collar (4) is made of a material having higher compressive strength than the mounting portion (3).

Images