JP2008128359A - Cover member mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate press-in work and pull-out work of a fixture such as an adapter to an elastic body such as a mount rubber and to surely acquire a press-in feeling. <P>SOLUTION: The mount rubber 11 is held in a storage frame body of an engine cover 1, and in this state, spaces C are formed between the storage frame body 9 and thinned parts 27 corresponding to engaging projection parts 21 in a through hole 13 in the outer peripheral surface of the mount rubber 11. When pressing the front end part of the adapter 15 into the through hole 13 of the mount rubber 11, the engaging projection parts 21 of the mount rubber 11 are elastically deformed in an outer diameter direction with a tapered part 37 of the front end of the adapter 15, and the deformed portions are allowed to escape into the spaces C. When the tapered part 37 passes through the engaging projection parts 21, the engaging projection parts 21 are restored into the original shape and engaged with a drum-shaped part 39 continuous with the base end of the tapered part 37 to mount the engine cover 1 to an engine through the mount rubber 11 and the adapter 15. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement in a cover member mounting structure, and more particularly to a mounting structure with a press-fitting operation.

In Patent Document 1, as an attachment structure for attaching an engine cover to an engine, an elastically deformable tubular mount rubber having a through hole is housed and held in a tubular housing frame projecting on the back surface of the engine cover body. The tip of the protruding rod-shaped adapter is press-fitted into the through-hole of the mount rubber, and the annular engagement protrusion on the inner peripheral surface of the through-hole is elastic in the outer diameter direction with the tapered shape at the tip of the adapter. A mounting structure is disclosed in which the engine cover is attached to the engine via a mount rubber and an adapter, and the vibration of the engine is absorbed and attenuated by the mount rubber after being deformed and engaged with the small diameter portion below. ing.
Japanese Patent Laying-Open No. 2005-321525 (pages 5-7, FIG. 1)

  However, in the above-mentioned Patent Document 1, when the tip portion of the adapter is press-fitted into the through hole of the mount rubber, the tip portion of the adapter is press-fitted because the engaging protrusion in the through hole is elastically deformed in the outer diameter direction. Although it is easy, the meat stealing part recessed in the outer peripheral surface of the elastic body in order to release the deformed part of the engaging ridge part in the outer diameter direction is located away from the engaging ridge part. For this reason, the engaging protrusion is thick in the radial direction, hardly elastically deformed, and is hard and difficult to press-fit. This is also true for the pulling work of removing the tip of the adapter from the through hole of the mount rubber. In addition, since the amount of elastic deformation of the engaging ridge is small and the reaction force is small, the response when the engaging ridge engages with the small diameter portion is small and it is difficult to obtain a press-fit feeling, and it is pressed in a normal state. It is difficult to determine whether or not

  The present invention has been made in view of the above points, and the object of the present invention is to easily perform press-fitting work and pull-out work of a fixture such as an adapter with respect to an elastic body such as a mount rubber and to ensure a press-fitting feeling. Is to get.

  In order to achieve the above object, the present invention is characterized in that the shape of the engaging ridge portion, the positional relationship between the engaging ridge portion and the meat stealing portion, and the shape of the tip portion of the fixture are devised. To do.

  Specifically, in the present invention, an elastically deformable cylindrical elastic body having a through hole is housed and held in a housing frame projecting on the back surface of the cover member main body of the cover member, and is projected on the attached body. A cover member mounting structure in which the tip end portion of the rod-shaped fixture is press-fitted into the through-hole of the elastic body and the cover member is attached to the mounted body via the elastic body and the fixture, and the following solution is provided. I took it.

  That is, according to the first aspect of the present invention, the annular engagement protrusion having a convex curved surface at the tip is integrally formed on the inner peripheral surface of the through hole of the elastic body toward the center of the through hole. The meat stealing portion is recessed toward the center of the through hole so as to correspond to the engaging protrusion, and on the distal end of the fixture, A taper that gradually decreases in diameter toward the tip is formed, and the taper proximal end has an outer diameter that corresponds to the convex curved surface at the tip of the engaging ridge, and the outer diameter is the taper proximal. The drum-shaped part having a concave curved surface is continuously formed so as to have a smaller diameter than the outer diameter of the container, and the storage frame and the meat stealer in a state where the elastic body is stored and held in the storage frame of the cover member. A space is formed between the tip and the tip when the tip of the fixture is pressed into the through hole of the elastic body. The joint ridge is elastically deformed in the outer diameter direction, and the deformed portion is released into the space, and the engagement ridge is restored to its original shape by passing through the engagement ridge. It is comprised so that it may engage with the said drum-shaped part.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, the engaging protrusions are substantially uniform in thickness and are formed in a U-shape with a substantially vertical cross section.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the meat stealer is provided with a plurality of ribs so as to support the engaging protrusions in the press-fitting direction of the fixture. It is characterized by being.

  According to the invention which concerns on Claim 1, when the front-end | tip part of the fixture by the side of a to-be-attached body is press-fit in the through-hole of the elastic body accommodated and hold | maintained at the storage frame of the cover member, the engaging protrusion part in the said through-hole Is engaged with the drum-shaped portion of the fixture, and the attachment of the fixture to the elastic body is restricted, and the cover member is attached to the attached body via the elastic body and the fixture. At this time, the engaging protrusion is pressed by the tip of the fixture and elastically deformed in the outer diameter direction, but the deformed portion is in the space between the housing frame and the meat stealing portion on the outer peripheral surface of the elastic body. In addition, since the thickness of the engaging ridge is not extremely thick because the meat stealing portion is on the outer side of the engaging ridge, the engaging ridge is soft and sufficiently elastically deformed. The press-fitting work can be easily performed. Similarly, the engaging protrusion can be easily pulled out. Further, since the amount of elastic deformation is large and the reaction force is large, and the shape of the hourglass-shaped portion of the fixture exhibits a concave curved surface corresponding to the convex curved surface at the tip of the engaging protrusion, the fixture It is possible to obtain a great response when the taper of the thread passes through the engaging ridge and the engagement ridge is restored to its original shape and engaged with the drum-shaped portion, and a press fit is surely obtained. It is possible to accurately know that the fixture is press-fitted in a normal state into the through hole of the elastic body.

  According to the invention of claim 2, since the shape of the engaging ridge is substantially uniform and has a substantially U-shaped longitudinal section, the engaging ridge is easily elastically deformed and attached. The press-fitting work and the drawing work of the tool can be performed more easily.

  According to the third aspect of the present invention, since there are a plurality of ribs that support the engaging ridges in the press-fitting direction of the fixture, the shape retention of the engaging ridges is increased, so-called sag phenomenon at the time of press-fitting. Is not generated, and the engaging protrusion can be reliably engaged with the drum-shaped portion of the fixture.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an example in which an attachment structure according to an embodiment of the present invention is applied when an engine cover (cover member) 1 is attached to an automobile engine (attached body) (not shown).

  The engine cover 1 is integrally formed of a resin material, and includes an engine cover main body (cover member main body) 3 formed in a substantially rectangular shape in plan view. A peripheral wall portion 5 is provided on the outer peripheral edge of the engine cover main body 3. Is integrally formed over the entire circumference so as to be bent at right angles to the back surface side. At both ends of one long side of the engine cover main body 3 (upper side in FIG. 1), extending portions 7 extending in a substantially semicircular shape in plan view are integrally formed to extend, and the peripheral wall portion 5 is It extends in a substantially semicircular shape in plan view so as to follow the outer diameter of the extending portion 7.

  As shown in FIG. 2, a cylindrical housing frame 9 is integrally formed at the center of the long side of the other side (lower side in FIG. 1) of the engine cover main body 3 and at the three positions on the back surfaces of the two extending portions 7, respectively. A cylindrical mounting rubber (elastic body) 11 that is elastically deformable is accommodated and held in these housing frame bodies 9 by press fitting, and a through hole 13 is centered in the radial center of the mounting rubber 11. Is formed through. The housing frame 9 on the extension part 7 side is constituted by the peripheral wall part 5 except for a part thereof. On the other hand, the engine is provided with three round bar-shaped resin adapters (mounting fixtures) 15 protruding therefrom. Then, the tip portions of these adapters 15 are press-fitted into the through holes 13 of the respective mount rubbers 11 to attach the engine cover 1 to the engine via the mount rubbers 11 and the adapters 15, and the vibrations of the engine are absorbed by the mount rubbers 11. Attenuates.

  As shown in FIG. 2, a taper-shaped contact surface 17 that expands in the outer diameter direction is formed on the protruding end edge (lower end edge) of the housing frame 9 over the entire circumference. A pair of rectangular engagement holes 19 are formed in the upper portion so as to penetrate in the radial direction at positions spaced 180 ° in the circumferential direction.

  Near the one end (upper end) of the inner peripheral surface of the through-hole 13 of the mount rubber 11, as shown in FIGS. 2 to 10, an annular engagement ridge portion 21 whose tip exhibits a convex curved surface 21 a extends over the entire periphery. The engaging ridges 21 are formed in a U-shape with a substantially uniform thickness and a substantially horizontal cross section. A tapered contact surface 23 that expands in the outer diameter direction is formed near the other end (lower end) of the inner peripheral surface of the through-hole 13 in the circumferential direction except for two places that are 180 ° apart in the circumferential direction. In addition, on the inner peripheral surface of the through-hole 13 corresponding to two locations between the both contact surfaces 23, an engagement recess 25 that engages with a mount rubber insertion jig (not shown) is opened around it. It is formed wider than the area (see FIGS. 7 and 8).

  Near the one end (upper end) of the outer peripheral surface of the mount rubber 11, the meat stealing portion 27 extends in the circumferential direction in a substantially U-shaped longitudinal section toward the center of the through-hole 13 so as to correspond to the engaging protrusion 21. It is recessed. As shown in FIG. 10, four first ribs 29a connect the engaging protrusion 21 to the adapter 15 at a position where the outer periphery of the engaging protrusion 21 of the meat stealing portion 27 is equally divided into four in the circumferential direction. Of the four first ribs 29a on the side of the two first ribs 29a located 180 ° opposite to the two first ribs 29a. The second rib 29b is erected integrally so as to intersect the two first ribs 29a and to support the engaging protrusion 21 in the press-fitting direction of the adapter 15.

  A pair of rectangular engagement protrusions 31 are positioned 180 ° apart from each other in the circumferential direction at the lower end of the meat stealing portion 27 in the center line direction of the through hole 13 on the outer peripheral surface of the mount rubber 11 and the pair of engagements. It projects integrally in the radial direction at an intermediate position of the recess 25. The pair of engaging protrusions 31 are adapted to engage with the engaging holes 19 of the housing frame 9 in a state where the mounting rubber 11 is housed and held in the housing frame 9. Further, two groove portions 33 extending in the circumferential direction are formed on the outer peripheral surface of the mount rubber 11 excluding a portion corresponding to the engagement recess 25, and the presence of the groove portions 33 facilitates deformation of the mount rubber 11 in the radial direction. The engagement protrusion 31 is easily engaged with the engagement hole 19. A tapered contact surface 35 that expands in the outer diameter direction is formed on the outer peripheral surface of the mount rubber 11 that is continuous with the lower end of the groove 33 over the entire circumference. The abutment surface 35 abuts on the abutment surface 17 at the lower end of the accommodation frame body 9 in a state where the mount rubber 11 is accommodated and held in the accommodation frame body 9.

  On the other hand, as shown in FIG. 2, the adapter 15 has a tapered tapered tip 37 that gradually decreases in diameter linearly toward the leading end. The drum-shaped portion 39 presenting the concave curved surface 39a is continuous so as to correspond to the convex curved surface 21a at the distal end of the engaging protrusion 21 and so that the outer diameter is smaller than the outer diameter of the proximal end 37. Is formed. The engaging protrusion 21 is elastically deformed and elastically engaged with the concave curved surface 39a of the drum-shaped portion 39 in a state where the tip end portion of the adapter 15 is press-fitted into the through hole 13 of the mount rubber 11. It is like that. The tapered portion 37 has a tapered shape that gradually decreases in diameter linearly toward the tip, but has a tapered shape that gradually curves in a convex shape as it goes to the tip, or that decreases in diameter while curving in a concave shape. May be.

  Below the drum-shaped portion 39, a regular hexagonal rotation operation portion 41 is formed continuously for rotation when the adapter 15 is attached to the engine. Further, a circular flange portion 43 is integrally formed in the outer diameter direction below the rotation operation portion 41. A tapered contact surface 45 is formed on the upper surface of the flange portion 43 so as to expand in the outer diameter direction. The abutment surface 45 abuts on the abutment surface 23 of the mount rubber 11 in a state where the tip end portion of the adapter 15 is press-fitted into the through hole 13 of the mount rubber 11. Although not shown, a female screw part is formed at the lower end of the adapter 15, and a male screw part of a stud bolt (not shown) attached to the upper part of the engine is screwed into the female screw part. At this time, a rotation operation jig is engaged with the rotation operation portion 41 of the adapter 15 to rotate the adapter 15 around the axis.

  In order to attach the engine cover 1 to the engine, first, the mount rubber 11 is housed and held in the housing frame 9 of the engine cover 1. At this time, the mount rubber insertion jig is engaged with the engagement recess 25 of the mount rubber 11, the mount rubber 11 is held by the mount rubber insertion jig, and the mount rubber 11 is received using the mount rubber insertion jig. Press fit into the frame 9. During this press-fitting process, the mount rubber 11 is compressed and deformed in the inner diameter direction and the center line direction of the through hole 13, the engagement protrusion 31 of the mount rubber 11 engages with the engagement hole 19 of the housing frame 9, and the lower end of the mount rubber 11 The outer abutment surface 35 abuts against the abutment surface 17 at the lower end of the housing frame 9, and the mount rubber 11 is accommodated and held in the housing frame 9. In this state, a space C is formed between the housing frame 9 and the meat stealing portion 27.

  Thereafter, the engine cover 1 is disposed above the engine, the housing frame 9 is made to correspond to the adapter 15, and the engine cover 1 is pressed against the engine. As a result, the tip of the adapter 15 is press-fitted into the through hole 13 of the mount rubber 11. During the press-fitting process, the tapered portion 37 of the adapter 15 elastically deforms the engaging protrusion 21 of the mount rubber 11 in the outer diameter direction, and the deformed portion is released into the space C, and the tapered portion 37 is engaged. By passing through the strip 21, the engaging projection 21 is restored to its original shape and engaged with the drum-shaped portion 39. In this state, the convex curved surface 21a of the engaging ridge portion 21 comes into full contact with the concave curved surface 39a of the drum-shaped portion 39, and the contact surface 45 of the flange portion 43 of the adapter 15 is the inner periphery of the lower end of the mount rubber 11 The engine cover 1 is attached to the engine via the mount rubber 11 and the adapter 15.

  On the other hand, in order to remove the engine cover 1 from the engine, the engine cover 1 may be pulled upward and lifted, and the adapter 15 may be pulled out from the through hole 13 of the mount rubber 11. At this time, the engagement protrusion portion 21 of the mount rubber 11 is pressed by the proximal end of the tapered portion 37 of the adapter 15 and elastically deforms in the outer diameter direction, and further, the tapered portion 39 passes through the tapered portion 39. Thus, the engaging protrusion 21 is restored to its original shape, whereby the adapter 15 is detached from the through hole 13 of the mount rubber 11 and the engine cover 1 is removed from the engine. At this time, since the pair of engaging protrusions 31 are engaged with the pair of engaging holes 19 of the housing frame 9, the mount rubber 11 does not come out of the housing frame 9.

  As described above, in this embodiment, the mount rubber 11 in which the annular engagement protrusion 21 protrudes from the inner peripheral surface of the through hole 13 is accommodated and held in the housing frame 9 of the engine cover 1, and the outer periphery of the mount rubber 11 is A space C is formed between the meat stealing portion 27 that is recessed so as to correspond to the engaging protrusion 21 on the surface and the housing frame 9, and the engaging protrusion 21 is connected to the tip of the adapter 15. 37, after elastically deforming in the outer diameter direction by 37 and escaping into the space C, the tip 37 passes through the engaging ridge 21 to restore the engaging ridge 21 to its original shape. The convex curved surface 21 a at the tip of the engaging protrusion 21 is brought into surface contact with the concave curved surface 39 a of the drum-shaped portion 39 by engaging with the drum-shaped portion 39 of the adapter 15.

  Therefore, there is a space C on the outer side of the engaging ridge portion 21, and the thickness of the engaging ridge portion 21 is extremely thick because the meat stealing portion 27 is on the outer side of the engaging ridge portion 21. Therefore, the engaging protrusion 21 is soft and can be sufficiently elastically deformed, so that the press-fitting operation can be easily performed. Similarly, the drawing operation can be easily performed. The engaging protrusion 21 has a large amount of elastic deformation and a large reaction force, and the shape of the drum-shaped portion 39 of the adapter 15 corresponds to the convex curved surface 21a at the tip of the engaging protrusion 21. Since the concave curved surface 39a is used, when the tapered portion 37 of the adapter 15 passes through the engaging ridge 21 and the engaging ridge 21 is restored to its original shape and engaged with the drum-shaped portion 39. Therefore, it is possible to accurately obtain that the adapter 15 is pressed into the through hole 13 of the mount rubber 11 in a normal state.

  Further, since the wall thickness of the engaging ridge portion 21 is formed in a substantially uniform vertical cross-section substantially horizontally U-shaped, the engaging ridge portion 21 is easily elastically deformed to press fit and pull out the adapter 15. Can be performed more easily.

  Further, since the plurality of first ribs 29a and second ribs 29b are erected on the meat stealing portion 27 and the engaging ridge 21 is supported in the press-fitting direction of the adapter 15, the shape of the engaging ridge 21 is retained. Therefore, the so-called settling phenomenon does not occur at the time of press-fitting, and the engaging protrusion 21 can be reliably engaged with the drum-shaped portion 39 of the adapter 15.

  In the above-described embodiment, the four first ribs 29a are erected radially at the position where the outer periphery of the engaging protrusion 21 of the meat stealing portion 27 is equally divided into four in the circumferential direction, and the four first Although the two second ribs 29b are erected so as to intersect the two first ribs 29a on the side of the two first ribs 29a located on the opposite side of 180 ° of the one rib 29a, the mount rubber 11 Depending on the elastic force, the first rib 29a intersecting with the second rib 29b may be separated from the engaging protrusion 21 as shown in FIG. Further, as shown in FIG. 11B as a second modified example, the four first ribs 29a may be separated from the engaging protrusions 21 and the second ribs 29b may be eliminated. However, in the rib structure of the embodiment and the first modification, two slide molds may be provided and slid in two directions orthogonal to the mold opening operation of the mold during molding, but in the rib structure of the second modification, Since four slide molds are provided and must be slid in four directions orthogonal to the mold opening operation of the mold during molding, the mold structure cannot be denied.

  Moreover, although the example applied when attaching the engine cover 1 to the engine of a motor vehicle was shown in the attachment structure which concerns on said embodiment, it applies also when attaching cover members other than the engine cover 1 to a to-be-attached body. Can do.

  The present invention is useful for a cover member attachment structure that involves a press-fitting operation, for example, an attachment structure for attaching an engine cover to an engine via a cylindrical elastic body and an adapter.

It is a top view of the engine cover of the state attached to the engine. It is sectional drawing in the II-II line of FIG. It is a perspective view of a mount rubber. It is a perspective view which cuts and shows a mounting rubber partially by the side of the 1st rib. It is a perspective view which cuts and shows a mounting rubber partially in the position of the 1st rib. It is a top view of a mount rubber. It is a bottom view of a mount rubber. It is sectional drawing in the VIII-VIII line of FIG. It is sectional drawing in the IX-IX line of FIG. It is sectional drawing in the XX line of FIG. FIG. 10A is a view corresponding to FIG. 10 illustrating a first modification of the mount rubber, and FIG. 10B is a view corresponding to FIG. 10 illustrating a second modification of the mount rubber.

Explanation of symbols

1 Engine cover (cover member)
3 Engine cover body (cover member body)
9 Housing frame 11 Mount rubber (elastic body)
13 Through hole 15 Adapter (mounting tool)
21 Engaging ridge 21a Convex curved surface 27 Meat stealing portion 29a First rib 29b Second rib 37 Tapered portion 39 Drum 39a Concave curved surface C Space

Claims (3)

An elastically deformable cylindrical elastic body having a through hole is accommodated and held in a housing frame projecting on the back surface of the cover member main body of the cover member, and the distal end portion of the rod-shaped fixture projecting on the mounted body is elasticized. A cover member mounting structure for press-fitting into a through-hole of the body and mounting the cover member to an attached body via an elastic body and a fixture,
On the inner peripheral surface of the through hole of the elastic body, an annular engagement protrusion having a convex curved surface at the tip is integrally projected toward the center of the through hole over the entire periphery, and In the peripheral surface, the meat stealing portion is recessed toward the center of the through hole so as to correspond to the engagement protrusion portion,
On the other hand, a taper that gradually decreases in diameter toward the tip is formed at the tip of the fixture, and an outer peripheral surface corresponds to the convex curved surface at the tip of the engaging protrusion at the tip of the taper. In addition, a drum-like portion having a concave curved surface is continuously formed so that the outer diameter is smaller than the outer diameter of the tapered base end,
In a state where the elastic body is housed and held in the housing frame of the cover member, a space is formed between the housing frame and the meat stealing portion, and the distal end portion of the fixture is press-fitted into the through hole of the elastic body. In this case, the tapered portion elastically deforms the engaging ridge portion in the outer diameter direction to release the deformed portion into the space, and the tapered portion passes through the engaging ridge portion, thereby the engaging ridge portion. The cover member mounting structure is configured to be restored to its original shape and engaged with the drum-shaped portion. The cover member mounting structure according to claim 1,
The cover protrusion mounting structure is characterized in that the engagement protrusions are substantially uniform in thickness and are formed in a U-shape with a substantially vertical cross section. In the mounting structure of the cover member according to claim 1 or 2,
An attachment structure for a cover member, wherein the meat stealing portion is provided with a plurality of ribs so as to support the engaging protrusions in the press-fitting direction of the fixture.

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