JP2011047497A - Structure mounting structure using grommet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure mounting structure using a grommet, capable of restricting outbreaks of noise, compact and rigid, and excellent in fitting workability. <P>SOLUTION: A fitting seat 3 includes: a leg part 3a; and a seat part 3b having a fitting hole 3c. A projecting member 5 has a nearly spherical swelling part 51. A grommet 1 includes: a fixed part 13 having an annular lock groove 13d; and a fitting part 11 structuring one side wall of the annular lock groove 13d and formed so that a swelling part 51 of a projecting member 5 is fitted therein on an engine cover C side than the fixed part 13. A fitting hole 1a is continuously formed through the fixed part 13 and the fitting part 11, and an annular engaging projection part 1b is radially projected inward so as to be elastically deformed when pressing the swelling part 51 of the projecting member 5 into the fitting hole 1a and so as to be engaged with a root of the swelling part 51, restoring to the original state after pressing the swelling part 5a of the projecting member 5 into the fitting hole 1a. The engaging projection 1b is provided at a position displaced form the fixed part 13 in the press-in direction of the projecting member 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a mounting structure for attaching an engine cover to an engine mounted on an automobile, for example.

  Conventionally, as an attachment structure for attaching an engine cover to an engine, for example, in Patent Documents 1 and 2, an annular engagement in a grommet fixing portion made of an elastic body is provided around the attachment hole of an attachment seat formed on the back surface of the engine cover. The engine cover is attached to the engine by engaging the stop groove and press-fitting a protruding member protruding from the upper surface of the engine into the fitting hole formed inside the fitting portion of the grommet, and is transmitted from the engine to the engine cover. The vibration is absorbed and attenuated by the grommet.

  The protruding member has a substantially spherical bulging portion that fits into the fitting hole formed at the tip of the shaft portion. An annular engaging protrusion is provided on the engine side of the inner surface of the fitting hole. When the bulging portion of the protruding member is press-fitted into the fitting hole, the engaging protrusion is elastically deformed in the outer diameter direction. Then, after the press-fitting, the original state is restored, and the engaging protrusion is engaged with the base of the bulging portion, whereby the bulging portion of the protruding member is fitted into the fitting hole.

EP 0902198 A2 (FIGS. 9 and 12) JP 2006-336743 A (paragraph 0018 column, FIG. 8)

  By the way, in recent years, due to demands such as cost reduction and weight reduction, there is a demand to make the grommet in the mounting structure of the engine cover attached to the engine compact. At this time, in order to ensure the rigidity of the mounting structure, it is necessary to make the grommet compact without changing the size of the fitting portion of the protruding member and the grommet.

  On the other hand, in patent document 1, the wall of the fixing | fixed part is provided around the fitting part, and when the fitting part and the wall of the fixing | fixed part are made close in order to make the whole grommet compact, vibration of an engine Due to this, there is a concern that the fitting portion and the fixing portion come into contact with each other and cause abnormal noise. Further, since the fitting portion is provided at a position away from the one side wall of the annular locking groove, it is easy to be elastically deformed, and excessive when the bulging portion of the protruding member is press-fitted into the fitting hole. When force is applied, there is a concern that the grommet may break due to excessive elastic deformation between the fitting portion and the fixed portion. In order to achieve a compact structure as a whole while avoiding this, as in Patent Document 2, the wall of the fixing portion surrounding the fitting portion is removed, and one side wall of the annular locking groove and the fitting portion are removed. It is conceivable to make the grommet compact and highly rigid while suppressing the generation of abnormal noise. However, in Patent Document 2, since the fixing portion is provided in the outer diameter direction of the engaging protrusion, when the grommet is attached to the mounting seat, the engaging protrusion is not easily elastically deformed in the outer direction. The press-fitting work of the members becomes difficult.

  The present invention has been made in view of such a point, and the object of the present invention is a structure using a grommet that is compact and highly rigid and further has excellent mounting workability while suppressing the generation of abnormal noise. The object is to have an attachment structure.

  In order to achieve the above object, the present invention is such that the fitting portion of the grommet is positioned on the structure side of the fixing portion, and the protruding portion engages with the fixing portion in the press-fitting direction of the protruding member into the grommet. It is characterized in that the positional relationship is shifted from the part.

  Specifically, in the first invention, the grommet made of an elastic body having a fitting hole is attached to a mounting seat formed on the back surface of the structure, and the protruding member protruding from the attached body is fitted to the grommet. A structure mounting structure using a grommet that attaches the structure to a mounted body via a grommet and a mounting seat by press-fitting into the hole, and the mounting seat is formed on the back surface of the structure A leg portion, and a seat portion having a mounting hole to which the grommet is attached, and having a space portion between the leg portion and the back surface of the structure, and the protruding member has a substantially spherical shape. The grommets are formed at the tip of the shaft portion, and the grommet has a fixing portion having an annular locking groove for locking and fixing the grommet to the periphery of the mounting hole, and one of the annular locking grooves The side wall of the fixed part And a fitting portion into which the bulging portion of the protruding member is fitted on the structure side, and the fitting hole is continuously formed in the fixing portion and the fitting portion, corresponding to the fitting portion. When the bulged portion of the protruding member is press-fitted into the fitting hole inner surface, the bulged portion is elastically deformed in the outer diameter direction and is restored to the original state after the press-fitting, and the root of the bulged portion is An annular engagement protrusion that engages with the protrusion is provided in the inner diameter direction, and the engagement protrusion is provided at a position shifted from the fixed portion in the press-fitting direction of the protrusion member.

  According to a second invention, in the first invention, a plate-like rib extending along the press-fitting direction of the protruding member is provided on the outer periphery of the fitting portion.

  According to a third invention, in the second invention, the fitting portion side outer periphery of the fitting portion extends so as to intersect the press-fitting direction of the protruding member, and one side wall of the annular locking groove of the fixing portion is provided. The fitting side collar part to comprise is provided, The said rib was taken as the structure connected with the said fitting side collar part.

  According to a fourth invention, in the third invention, an annular extension portion extending so as to intersect the press-fitting direction of the protruding member is formed on the outer periphery of the fitting portion on the structure side, and the annular extension The portion is connected to the rib.

  According to a fifth invention, in any one of the first to fourth inventions, a stopper portion that protrudes so as to intersect the press-fitting direction of the protruding member is formed on the leg base end side of the mounting seat. The portion is configured to prevent excessive deformation of the fitting portion in the press-fitting direction of the protruding member.

  According to a sixth invention, in any one of the first to fifth inventions, the inner surface of the fitting portion is formed when the bulging portion of the protruding member is fitted to the fitting portion. In this configuration, a gap is formed in a part between the front surface and the inner surface of the fitting portion.

  According to the first invention, the wall of the fixed part around the fitting part as formed in Patent Document 1 is removed, and the one side wall of the annular locking groove is connected to the fitting part. Therefore, the generation of abnormal noise can be prevented, and a compact and highly rigid mounting structure can be obtained. Furthermore, since the positional relationship between the engaging protrusion of the fitting portion and the fixing portion is shifted in the press-fitting direction of the protruding member, when the protruding portion of the protruding member is fitted to the fitting portion, the engaging protrusion Is easily elastically deformed, and the bulging portion of the protruding member can be easily fitted into the fitting portion.

  According to the second invention, the elastic deformation in the press-fitting direction of the protruding member is moderately suppressed in the fitting portion by the plate-like rib formed on the outer periphery of the fitting portion. Therefore, when the bulging portion of the protruding member is press-fitted into the fitting portion, a situation in which the fitting portion excessively extends in the press-fitting direction of the protruding member due to the pressing force is avoided, and the fitting portion is prevented from being broken. be able to.

  According to 3rd invention, the rib formed in the outer periphery of a fitting part comprises the one side wall of the annular locking groove of the fixing | fixed part provided in the to-be-attached body side outer periphery of this fitting part. Since it is connected to the flange portion, the elastic deformation of the fitting portion in the press-fitting direction of the protruding member is further suppressed with respect to the fixed portion. Thereby, the vibration attenuation of the structure attached to the protruding member via the grommet can be further accelerated.

  According to the fourth invention, since the annular extending portion is provided on the outer periphery of the fitting portion on the structure side, the rigidity of the fitting portion can be increased. Moreover, since the said annular extension part is connected with a rib, in the press-fit direction of a protrusion member, an elastic deformation | transformation is further suppressed and the fracture | rupture of a fitting part can be suppressed further, and a structure can be suppressed. Vibration damping can be further accelerated.

  According to the fifth invention, the stopper portion provided on the mounting seat is formed at a position for preventing the elastic deformation in the press-fitting direction of the protruding member in the fitting portion of the grommet. When the fitting part is press-fitted or when engine vibration is applied to the fitting part, the stopper part can suppress excessive deformation of the fitting part. As a result, when the force is excessively applied when the protruding portion of the protruding member is press-fitted into the fitting portion, or even when engine vibration is applied to the fitting portion, the fitting portion is broken. Can be prevented.

  According to the sixth invention, when the protruding portion of the protruding member is fitted into the fitting portion, a gap is formed in a part between the surface of the protruding portion and the inner surface of the fitting portion. Therefore, when the bulging portion is fitted to the fitting portion, air between the bulging portion and the fitting portion can be easily released, and the protruding member can be easily fitted to the fitting portion.

It is a perspective view of an attachment structure when an engine cover is attached to the engine using a grommet. It is a disassembled perspective view of the attachment structure which attaches an engine cover using a grommet to an engine. It is sectional drawing of the AA in FIG. It is a top view of the attachment seat of an engine cover. It is a perspective view of the grommet concerning the modification of an embodiment.

  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 view showing a state in which a resin engine cover (structure) C is attached to an upper part of an engine (attached body) E using a grommet 1. A plurality of mounting seats 3 are provided on the engine E side of the engine cover C. The grommet 1 is attached to the mounting seat 3, and the protruding member 5 provided in the engine E is press-fitted into a fitting hole 1a, which will be described later, formed in the grommet 1, so that the grommet 1 and the protruding member 5 are fitted. By doing so, the engine cover C is attached to the engine E, and the vibration transmitted from the engine E to the engine cover C is absorbed and attenuated by the grommet 1.

  As shown in FIGS. 1 to 3, the grommet 1 is a substantially conical member made of an elastic body such as rubber, and includes a fitting portion 11 into which the protruding member 5 is fitted, and the fitting portion 11. It is connected to the engine E side and includes a fixing portion 13 for attaching the grommet 1 to the attachment seat 3.

  The fitting portion 11 includes a substantially circular upper wall portion 11a, a first inclined wall portion 11b that linearly expands from the outer peripheral edge of the upper wall portion 11a toward the engine E side, and the first A second inclined wall portion 11c that linearly decreases in diameter from the outer peripheral edge of the inclined wall portion toward the engine E side, and linearly expands from the inner peripheral edge of the second inclined wall portion 11c toward the engine E side. A third inclined wall portion 11d having a diameter and a substantially disk-shaped fitting side flange portion 11h extending outward from the outer peripheral edge of the third inclined wall portion 11d are provided. The fitting side flange portion 11h constitutes one side wall of an annular locking groove 13d of the fixing portion 13 described later. Accordingly, the fitting portion 11 is compact in the press-fitting direction of the protruding member 5, and the fitting side collar portion 11 h constitutes one side wall of the annular locking groove 13 d of the fixing portion 13. It becomes difficult to elastically deform between the fixed part 13 and the elastic deformation of the protruding member 5 in the press-fitting direction with respect to the fixed part 13 is moderately suppressed. Moreover, the outer peripheral edge of the fitting side collar part 11h is located outward from the outer peripheral edge of the annular extending part 11e.

  The first inclined wall portion 11b is formed with a plate-like annular extending portion 11e extending outward from the outer peripheral surface of the first inclined wall portion 11b on the engine cover C side. The outer peripheral edge of the annular extending portion 11e is located outward from the outer peripheral edge of the first inclined wall portion 11b. Further, the second inclined wall portion 11c and the third inclined wall portion 11d protrude outward from the outer peripheral surfaces of the second inclined wall portion 11c and the third inclined wall portion 11d, and follow the press-fitting direction of the protruding member 5. Four plate-like ribs 11f extending in the circumferential direction are formed at equal intervals. The upper end of the rib 11f is connected to the annular extending portion 11e, and the lower end of the rib 11f is connected to the fitting side flange portion 11h. Accordingly, the fitting portion 11 is further restrained from elastic deformation in the press-fitting direction of the protruding member 5 with respect to the fixed portion 13.

  The fixed portion 13 is formed integrally with the fitting-side flange 11h via the small-diameter portion 13b connected to the engine-E side of the fitting-side flange 11h, and the fitting-side flange 11h. And a substantially disc-shaped insertion side flange 13c provided substantially in parallel. The outer peripheral edge of the insertion side flange 13c is located outward from the outer peripheral edge of the fitting side flange 11h. Moreover, the outer peripheral edge of the small diameter part 13b is located inward from the outer peripheral edge of the fitting side collar part 11h and the insertion side collar part 13c.

  An annular locking groove 13d that is recessed in the inner diameter direction and extends along the outer periphery is formed on the outer periphery of the fixed portion 13. The annular locking groove 13d is formed by a fitting side flange portion 11h, a small diameter portion 13b, and an insertion side flange portion 13c.

  The thickness of the insertion side flange 13c is formed to be thicker than the thickness of the fitting side flange 11h. Further, the outer peripheral edge of the small diameter portion 13b is formed to be slightly larger than the inner peripheral edge of the mounting hole 3c formed in the seating portion 3b of the mounting seat 3 described later. And the height of the small diameter part 13b is formed so that it may become substantially the same as the plate | board thickness of the said seating part 3b.

  Inside the fitting portion 11 and the fixing portion 13, a fitting hole 1a that opens to the engine E side is continuously formed. On the inner surface of the fitting hole 1a corresponding to the fitting portion 11, on the engine E side, an annular engagement protrusion 1b composed of the second inclined wall portion 11c and the third inclined wall portion 11d is provided in the inner diameter direction. Projected. The engagement protrusion 1b is formed so that the inner diameter is smaller than the outer diameter of the bulging portion 51 of the protruding member 5 described later. Further, when the bulging portion 51 is press-fitted into the fitting hole 1a, the engagement protruding portion 1b is elastically deformed in the outer diameter direction, and after the press-fitting, the original state is restored to the root of the bulging portion 51. It is designed to engage.

  The inner diameter of the fitting hole 1a corresponding to the fixed portion 13 is formed to be larger than the diameter of the bulging portion 51 of the protruding member 5, so that the bulging portion 51 of the protruding member 5 can be easily passed. Yes. Further, an inclined surface 1c having a tapered shape that expands in the outer diameter direction is formed near the engine E side end of the inner peripheral surface of the fitting hole 1a, and the bulging portion 51 of the protruding member 5 is connected to the fitting hole 1a. When press-fitting into the fitting hole 1a, it is easy to be guided into the fitting hole 1a.

  As shown in FIGS. 2 to 4, the mounting seat 3 is a portion formed integrally with the engine E side, which is the back side of the engine cover C. The mounting seat 3 has a space R between the leg 3a formed integrally with the back of the engine cover C and the back of the engine cover C at the front end of the leg 3a in the protruding direction. And a plate-like seating portion 3b formed integrally.

  The leg 3a has a U-shaped cross section, and is formed so that the interval between the opposing walls becomes slightly wider toward the open side of the side wall as shown in FIG. A plate-like stopper portion 3e is formed on the inner surface of the leg portion 3a on the engine cover C side so as to protrude toward the open side of the side wall and to be connected to the rear surface of the engine cover C. As shown in FIG. 3, the stopper portion 3 e is formed at a position that is spaced apart from the upper wall portion 11 a when the grommet 1 is attached to the attachment seat 3. The stopper portion 3e is formed at a position that prevents elastic deformation in the press-fitting direction of the protruding member 5 in the fitting portion 11. Although the stopper portion 3e of the present embodiment is connected to the back surface of the engine cover C, the stopper portion 3e is formed at a position away from the back surface of the engine cover C as long as it is at a certain distance from the upper wall portion 11a. May be. For example, it may have a plate shape that bridges the opposing walls of the leg portion 3a at a position away from the back surface of the engine cover C, and prevents elastic deformation in the press-fitting direction of the protruding member 5 at the fitting portion 11. What is necessary is just to be formed in the position to do.

  The seat portion 3b is formed with a substantially circular mounting hole 3c penetrating in the thickness direction of the seat portion 3b, and an opening 3d is formed on the open side of the leg portion 3a in the mounting hole 3c. The diameter of the mounting hole 3c is set slightly smaller than the diameter of the small diameter portion 13b of the grommet 1 and smaller than the diameters of the fitting side flange portion 11h and the insertion side flange portion 13c. The width of the opening 3d is set to be smaller than the diameter of the small diameter portion 13b. Accordingly, when the grommet 1 is press-fitted into the mounting seat 3 from the opening 3d of the seat portion 3b so that the peripheral edge of the mounting hole 3c of the mounting seat 3 is fitted into the annular locking groove 13d of the grommet 1, the annular locking groove 13d. Thus, the grommet 1 can be locked and fixed to the peripheral edge of the mounting hole 3c. Since the width of the opening 3d is smaller than the diameter of the small diameter portion 13b, the grommet 1 is prevented from unexpectedly falling out of the opening 3d due to vibration of the engine E after the grommet 1 is attached to the periphery of the attachment hole 3c. It has a structure that can be done.

  Further, when the grommet 1 is attached to the mounting seat 3, the gap between the outer peripheral edge of the annular extending portion 11 e and the fitting side flange portion 11 h of the fitting portion 11 and the inner peripheral surface of the leg portion 3 a of the mounting seat 3 is between A certain distance is provided so that the ring-shaped extending portion 11e and the fitting side flange portion 11h do not come into contact with the leg portion 3a due to the vibration of the engine E. Thereby, generation | occurrence | production of abnormal noise can be suppressed.

  As shown in FIG. 3 or FIG. 4, the protruding member 5 is formed so as to be continuous with the substantially spherical bulged portion 51 formed at the tip of the shaft portion 53 and the engine E side of the shaft portion 53. When the member 5 is attached to the engine E, a regular hexagonal turning operation portion 55 that is a portion to be gripped by a tool (not shown), and an outer diameter direction formed continuously on the engine E side of the turning operation portion 55. An extending circular flange portion 57 and a screwing portion 59 for attaching the protruding member 5 to the engine E formed continuously on the engine E side of the flange portion 57 are provided.

  As shown in FIG. 3, the bulging portion 51 is formed with a tapered tip 51 a that gradually decreases in diameter linearly toward the tip. A central portion 51b having a substantially cylindrical shape and an outer diameter that is the same as the outer diameter of the proximal end of the tapered detail 51a is continuously formed at the proximal end of the tapered detail 51a. An engagement base portion 51c is formed continuously at the base end of the central portion 51b, and the engagement base portion 51c has a tapered shape that gradually decreases in diameter linearly toward the base end side. When the bulging portion 51 is press-fitted into the fitting hole 1a, the surface of the tapered portion 51a has a shape along the inner surfaces of the upper wall portion 11a and the first inclined wall portion 11b. The surface of the engagement base 51c has a shape along the inner surface of the second inclined wall portion 11c. On the other hand, the surface of the central portion 51b is located slightly away from the inner surfaces of the first inclined wall portion 11b and the second inclined wall portion 11c, and there is a gap between the inner surface of the fitting portion 11 and the surface of the bulging portion 51. S (shown in FIG. 3) is formed. Therefore, when the bulging portion 51 is fitted to the fitting portion 11, air between the bulging portion 51 and the fitting portion 11 is easily released, and the protruding member 5 is easily fitted to the fitting portion 11. be able to.

  The tapered portion 51a and the engagement base 51c are tapered to linearly expand or contract, but may have a shape that expands or contracts while being curved. Similarly, the outer peripheral surface of the central portion 51b may be curved. Moreover, in this embodiment, although the clearance gap S is formed between the inner surface of the 1st inclination wall part 11b and the 2nd inclination wall part 11c, and the surface of the center part 51b of the bulging part 51, What is necessary is just to make it the clearance gap S be formed in a part between the fitting part 11 and the bulging part 51. FIG.

  Next, attachment of the engine cover C to the engine E will be described. First, the grommet 1 is attached to the attachment seat 3 of the engine cover C. The grommet 1 is press-fitted into the mounting seat 3 from the opening 3d of the seating portion 3b so that the peripheral edge of the mounting hole 3c of the seating portion 3b is fitted into the annular locking groove 13d of the grommet 1, and the grommet 1 is inserted into the mounting seat 3 Accommodate. At this time, since the fitting part 11 is located on the engine cover C side with respect to the fixing part 13, the wall of the fixing part 13 surrounds the fitting part 11 as formed in Patent Document 1. Absent. Thereby, generation | occurrence | production of the noise by the contact of the fixing | fixed part 13 and the fitting part 11 can be prevented.

  After housing the grommet 1 in the mounting seat 3, the engine cover C is disposed above the engine E so that the mounting seat 3 corresponds to the protruding member 5 attached to the engine E, and the engine cover C is attached to the engine E. Press. Thereby, the bulging part 51 of the projection member 5 is press-fitted into the fitting hole 1 a of the grommet 1. At this time, first, the tapered portion 51a and the central portion 51b of the bulging portion 51 elastically deform the engaging protrusion 1b in the outer diameter direction. Thereafter, when the tapered portion 51a and the central portion 51b pass through the engagement protrusion 1b, the engagement protrusion 1b is restored to its original state and engaged with the base of the bulging portion 51. In this state, the inner surfaces of the upper wall portion 11a and the first inclined wall portion 11b come into contact with the surface of the tapered portion 51a of the bulged portion 51, and the inner surface of the second inclined wall portion 11c and the surface of the engagement base portion 51c are in contact with each other. The bulging part 51 fits into the fitting hole 1a in contact. At this time, since the engagement protrusion 1b and the fixed portion 13 are in a positional relationship shifted in the press-fitting direction of the protruding member 5, the engagement protrusion 1b is easily elastically deformed in the outer diameter direction and easily swells. The protruding portion 51 can be fitted into the fitting portion 11. Further, the inner diameter of the fitting hole 1a on the side of the engine E from the engagement protrusion 1b is formed larger than the outer diameter of the bulging part 51 of the protruding member 5, and the engine E on the inner peripheral surface of the fitting hole 1a. Since the inclined surface 1c is formed near the side end, the bulging portion 51 of the protruding member 5 is easily guided into the fitting hole 1a.

  As mentioned above, according to this embodiment, the wall of the fixing | fixed part 13 around the fitting part 11 which is formed in patent document 1 is removed, and the fitting side which comprises one side wall of the annular locking groove 13d Since the flange part 11h and the fitting part 11 are connected, generation | occurrence | production of abnormal noise can be suppressed and it can be set as a compact and highly rigid attachment structure. Furthermore, since the positional relationship between the engaging protrusion 1b of the fitting portion 11 and the fixing portion 13 is shifted in the press-fitting direction of the protruding member 5, the bulging portion 51 of the protruding member 5 is fitted to the fitting portion 11. At this time, the engaging protrusion 1b is easily elastically deformed, and the bulging portion 51 of the protruding member 5 can be easily fitted to the fitting portion 11.

  In addition, the elastic deformation of the protruding portion 5 in the press-fitting direction of the fitting portion 11 is moderately suppressed by the plate-like ribs 11 f formed on the outer periphery of the fitting portion 11. Therefore, when the bulging portion 51 of the protruding member 5 is press-fitted into the fitting portion 11, a situation in which the fitting portion 11 extends excessively in the press-fitting direction of the protruding member 5 due to the pressing force is avoided. 11 breakage can be prevented.

  Moreover, since the rib 11f formed in the outer periphery of the fitting part 11 is connected with the fixing | fixed part 13, the fitting part 11 further suppresses the elastic deformation to the press injection direction of the protrusion member 5 with respect to the fixing | fixed part 13. The Thereby, the vibration attenuation of the engine cover C attached to the protruding member 5 via the grommet 1 can be accelerated.

  Further, since the annular extending portion 11e is provided on the outer periphery of the fitting portion 11 on the engine cover C side, the rigidity of the fitting portion 11 can be increased. In addition, since the annular extending portion 11e is connected to the rib 11f, the fitting portion 11 is further prevented from elastic deformation in the press-fitting direction of the protruding member 5, and the fitting portion 11 can be prevented from breaking. The vibration attenuation of the engine cover C can be further accelerated.

  Further, since the stopper portion 3 e provided on the mounting seat 3 is formed at a position that prevents the elastic deformation in the press-fitting direction of the protruding member 5 in the fitting portion 11 of the grommet 1, the bulging portion 51 of the protruding member 5. The stopper portion 3e can suppress excessive deformation of the fitting portion 11 when the fitting portion 11 is pressed into the fitting portion 11 or when vibration of the engine E is applied to the fitting portion 11. Thereby, even when the force is excessively applied when the bulging portion 51 of the protruding member 5 is press-fitted into the fitting portion 11 or when the vibration of the engine E is applied to the fitting portion 11, the fitting portion 11 is It can prevent that it breaks.

  Further, when the bulging portion 51 of the protruding member 5 is fitted to the fitting portion 11, a gap S is formed in a part between the surface of the bulging portion 51 and the inner surface of the fitting portion 11. Therefore, when the bulging portion 51 is fitted to the fitting portion 11, the air between the bulging portion 51 and the fitting portion 11 is easily released, and the protruding member 5 is easily fitted to the fitting portion 11. Can be combined.

  Moreover, it is good also as the grommet 1 which does not provide the annular extension part 11e in the fitting part 11 like the modification of embodiment shown in FIG. As shown in FIG. 5, the four plate-like ribs 11 g are formed at equal intervals in the circumferential direction of the outer peripheral surface of the fitting portion 11 along the press-fitting direction of the protruding member 5. The four ribs 11g are connected to each other at the distal end side of the fitting portion 11.

  Therefore, according to the modification of this embodiment, since the annular extending part 11e is not provided, the distance between the fitting part 11 and the leg part 3a of the mounting seat 3 is increased, and the fitting part 11 Generation of abnormal noise due to contact with the leg 3a can be further suppressed.

  Further, in this modified example, when the grommet 1 is attached to the attachment seat 3, the rib 11g is positioned between the stopper portion 3e and the upper wall portion 11a of the fitting portion 11. Thereby, for example, even when a large vibration of the engine E is applied to the fitting portion 11 and the fitting portion 11 is excessively deformed, the fitting portion 11 and the stopper portion 3e come into contact with each other. The rib 11g and the stopper portion 3e come into contact with each other without the upper wall portion 11a coming into direct contact with the stopper portion 3e, and the rib 11g absorbs an impact at the time of contact. Therefore, in the grommet 1 of this modification, even in the above case, the generation of abnormal noise can be suppressed as much as possible.

  In the present embodiment, the fitting hole 1a is opened only on the engine E side, but may be a through hole that also opens the engine cover C side.

  The present invention is suitable for use in, for example, a mounting structure for attaching an engine cover to an engine mounted on an automobile.

DESCRIPTION OF SYMBOLS 1 Grommet 1a Fitting hole 1b Engagement protrusion part 3 Mounting seat 3a Leg part 3b Seating part 3c Mounting hole 3d Opening port 3e Stopper part 5 Protruding member 11 Fitting part 11e Annular extension part 11f Rib 11g Rib 11h Fitting side collar Part 13 Fixing part 13b Neck part 13c Insertion side flange part 13d Annular locking groove 51 Swelling part 51a Tapered part 51b Center part 51c Engagement base 53 Shaft part R Space part S Gap E Engine (attached body)
C Engine cover (structure)

Claims (6)

A grommet made of an elastic body having a fitting hole is attached to a mounting seat formed on the back surface of the structure, and a protruding member protruding from the attached body is press-fitted into the fitting hole of the grommet, thereby A structure mounting structure using a grommet to be attached to a body to be attached via a grommet and a mounting seat,
The mounting seat is formed so as to have a space portion between a leg portion formed on the back surface of the structure and a back surface of the structure at a tip of the leg portion, and has a mounting hole to which the grommet is attached. With a seating section,
The protruding member has a substantially spherical bulge formed at the tip of the shaft,
The grommet constitutes a fixing portion having an annular locking groove for locking and fixing the grommet to the periphery of the mounting hole, and one side wall of the annular locking groove, and is closer to the structure than the fixing portion. And a fitting portion into which the bulging portion of the protruding member is fitted,
The fixing hole and the fitting part are continuously formed with the fitting hole,
The inner surface of the fitting hole corresponding to the fitting portion is elastically deformed in the outer diameter direction when the protruding portion of the protruding member is press-fitted on the mounted body side, and is restored to the original state after the press-fitting. An annular engagement protrusion that engages with the base of the bulge is provided in the inner diameter direction,
The attachment structure for a structure using a grommet, wherein the engaging protrusion is provided at a position shifted from the fixed portion in the press-fitting direction of the protruding member. A structure mounting structure using the grommet according to claim 1,
A structure mounting structure using a grommet, characterized in that a plate-like rib extending along the press-fitting direction of the protruding member is provided on the outer periphery of the fitting portion. A structure mounting structure using the grommet according to claim 2,
On the outer periphery of the fitting body side of the fitting portion, a fitting side collar portion is provided that extends so as to intersect the press-fitting direction of the protruding member and constitutes one side wall of the annular locking groove of the fixing portion,
A structure mounting structure using a grommet, wherein the rib is connected to the fitting side flange. A structure mounting structure using the grommet according to claim 3,
On the structure-side outer periphery of the fitting portion, an annular extending portion is formed that extends so as to intersect the press-fitting direction of the protruding member,
The structure for attaching a structure using a grommet, wherein the annular extending portion is connected to the rib. A structure mounting structure using the grommet according to any one of claims 1 to 4,
A stopper portion that protrudes so as to intersect the press-fitting direction of the projecting member is formed on the base end side of the leg portion of the mounting seat,
The structure for mounting a structure using a grommet, wherein the stopper portion is configured to prevent excessive deformation of the fitting portion in the press-fitting direction of the protruding member. A structure mounting structure using the grommet according to any one of claims 1 to 5,
The inner surface of the fitting portion has a gap in a part between the surface of the protruding portion and the inner surface of the fitting portion when the protruding portion of the protruding member is fitted to the fitting portion. A structure mounting structure using a grommet characterized by being formed.

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