JP2014025423A - Engine cover mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform a pressure-fitting operation and a drawing operation of a cap to and from a mounting seat, and reliably obtain a moderation feeling during pressure-fitting.SOLUTION: After a spherical head 17 and a skirt part 19 of a cap 15 are compressed to narrow width of a slit 21 and the cap is deformed in a diameter-reduction direction and inserted in a mounting seat 13, compression is cancelled and width of the slit 21 is enlarged, so as to recover original shapes of the spherical head 17 and the skirt part 19. Then, a protrusion piece 17b of the cap 15 is engaged with an engagement hole 13a of the mounting seat 13. While a constricted part 15b between the skirt part 19 and the spherical head 17 is pressurized in a radial outside direction by a swollen part 9 of an adapter 5 to enlarge width of the slit 21, the swollen part 9 is fitted with a fitting hole 15a. An engine cover 3 is mounted to an engine block 1 via the cap 15 and the adapter 5.

Description

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

  In Patent Document 1, as an engine cover mounting structure, a rubber cap is housed and held in a cylindrical mounting seat protruding from the back surface of the cover body of the engine cover, and the cap is interposed between the back surface of the cover body and the cap. The engine cover is attached to the engine via the cap and the pin by press-fitting and inserting the tip of the rod-shaped pin protruding from the engine into the fitting hole of the cap. An engine cover mounting structure is disclosed. The cap is moved to the moving space by an impact applied to the engine cover, so that the impact is absorbed and attenuated.

JP 2004-300950 A (paragraph 0024 column to paragraph 0027 column, FIGS. 1 to 5, etc.)

  By the way, the mounting seat of the above-mentioned Patent Document 1 is composed of a seat body having a holding hole and three connecting portions for connecting the seat body to the back surface of the cover body, and one side is open. The seat body has a cutout portion formed on the open side of the mounting seat, following the holding hole. On the other hand, a ring-shaped engagement groove is formed on the outer peripheral surface of the cap. The cap is accommodated and held in the mounting seat by pressing the cap into the mounting seat from the open side with the engagement groove corresponding to the cutout portion of the seat body.

  Therefore, when the cap is accommodated and held in the mounting seat, a large pressure input is required to pass the cap through the narrow notch, and there is a problem that it takes time to mount the cap (accommodating and holding the mounting seat). This is also true for the pulling work for removing the cap from the mounting seat.

  In addition, since the cap is made of rubber, it is softer than that made of resin, the response when pressing the tip of the rod-like pin into the fitting hole of the cap is small, and it is difficult to obtain a press fit, so-called moderation feeling, It is difficult to determine whether or not it is press-fitted in a normal state.

  The present invention has been made in view of such a point, and an object of the present invention is to easily perform a press-fitting operation and a pull-out operation of the cap with respect to the mounting seat and to surely obtain a feeling of moderation during the press-fitting.

  In order to achieve the above object, the present invention employs a resin cap instead of rubber and is devised in its structure.

  Specifically, in the present invention, a cap having a fitting hole is accommodated and held in a cylindrical mounting seat protruding from the back surface of the cover body of the engine cover, and the tip end portion of the rod-shaped mounting tool protruding from the engine is disposed. The following solution was taken for an engine cover mounting structure in which the engine cover is press-fitted into the cap insertion hole, and the engine cover is attached to the engine via the cap and fixture.

  That is, according to the first aspect of the present invention, a plurality of engaging holes are formed at intervals in the circumferential direction near the projecting edge of the mounting seat, and the cap has a protruding piece that engages with the engaging hole. It is made of a resin including a ball head having a plurality of holes on the outer surface and having the fitting hole therein, and a skirt part that extends conically from the ball head and opens the fitting hole to the outside. A plurality of slits are formed continuously from the end of the skirt portion to the spherical head, and the fixture is formed in a spherical shape at the tip of the shaft portion and at the tip of the shaft portion to constitute the tip portion. In the process of accommodating and holding the cap in the mounting seat, the ball head and skirt are compressed by compressing the cap and the skirt to narrow the slit. The ball head is deformed in the radial direction and inserted into the mounting seat. And by releasing the compression of the skirt and expanding the width of the slit, the spherical head and the skirt are restored to their original shapes, and the projecting piece is engaged with the engagement hole of the mounting seat, and the swelling When the protruding portion is press-fitted into the fitting hole from the skirt portion of the cap and is fitted, the boundary portion is pressed while pressing the boundary portion between the skirt portion and the spherical head in the radially outward direction while expanding the width of the slit. The engine cover is attached to the engine through the cap and the fixture through the part and fitted into the fitting hole.

  According to a second invention, in the first invention, the skirt portion (19) is in contact with the protruding end edge of the mounting seat (13) while the cap is accommodated and held in the mounting seat, A gap is formed between the inner peripheral surface of the mounting seat, and the vertical thickness of the projecting piece is set to be smaller than the vertical dimension of the engaging hole and the horizontal direction of the projecting piece. The width is set smaller than the opening dimension in the horizontal direction of the engagement hole, and a gap is also formed between the projecting piece and the inner periphery of the engagement hole.

  According to a third aspect of the present invention, in the first or second aspect, the cap is accommodated in the mounting seat, and the above-mentioned cover body back surface of the engine cover and the ball head portion of the cap are affected by an impact. A movement space that allows movement of the cap when the projecting piece is removed from the engagement hole is formed.

  According to the first invention, when a force is applied by pinching the terminal of the skirt portion of the cap with a finger, the spherical head portion and the skirt portion of the cap are compressed and the width of the slit is narrowed. Since it deforms in the direction of diameter reduction, in this state, the cap can be inserted into the mounting seat from its projecting edge side without contacting the inner peripheral surface of the mounting seat, and mounting of the cap (accommodating and holding the mounting seat) is easy. Yes. Similarly, the cap is easily pulled out from the mounting seat.

  Further, when the bulging portion of the engine-side fixture is press-fitted into the fitting hole of the cap accommodated and held in the mounting seat of the cover body, the boundary portion between the cap skirt and the ball head is diametrically formed by the bulging portion. Pressed outward, the bulging portion passes through the boundary portion while expanding the width of the slit, and is fitted into the fitting hole. When this fitting is completed, the cap is made of a resin that is harder than rubber. Therefore, it is released from the pressing force and restored to its original shape vigorously, and a reliable response (moderate feeling) can be obtained when press fitting the bulging part of the fixture into the fitting hole of the cap. The installation state of can be seen.

  Further, the cap has a fitting hole corresponding to the bulging portion of the fixture in the ball head, and the skirt portion following the fitting hole expands conically from the ball head to enlarge the fitting hole to the outside. Since it is open and has a wide space inside, the bulging portion of the fixture is smoothly guided to the fitting hole of the cap by slidingly contacting the inner peripheral surface of the skirt portion. In addition, the thickness of the fixture (shaft portion and bulging portion) is thinner than that of the case where the fitting hole is in contact with the inner peripheral surface of the cap, and the material cost can be reduced, resulting in a lightweight and inexpensive cap.

  According to the second invention, even if the mounting position of the engine cover is slightly changed due to a manufacturing error or the like, the relationship between the ball head and the inner peripheral surface of the mounting seat, and the protrusion between the ball head and the mounting seat. Since gaps are formed between the inner peripheries of the joint holes, the positional deviation due to the fluctuation is absorbed and the relative position between the cap head and the mounting seat is finely adjusted. At this time, since the skirt portion is pressed against the protruding end edge of the mounting seat, rattling of the engine cover is prevented and the vibration damping capability is enhanced.

  According to the third aspect of the invention, when the impact is applied to the engine cover and the projecting piece on the ball head of the cap is disengaged from the engagement hole of the mounting seat, the cap moves in the moving space in the mounting seat to move the cover body. Approach the back side. At this time, since the projecting piece and the skirt portion slide while being pressed against the inner peripheral surface of the mounting seat, the ball head does not strike the back surface of the cover body vigorously, and the shock is efficiently absorbed and attenuated.

It is a front view which shows the engine cover attachment structure which concerns on embodiment. It is a right view of FIG. It is sectional drawing in the III-III line of FIG. It is sectional drawing in the IV-IV line of FIG. The attachment seat seen from the cover main body back surface of an engine cover is shown, (a) is an embodiment, (b) is a modification. The cap of embodiment is shown, (a) is a front view, (b) is a top view. In embodiment, it is sectional drawing which shows the state which deform | transformed the cap in the diameter reduction direction by a virtual line, and the state which accommodated and hold | maintained the cap to the attachment seat by a continuous line, respectively. In embodiment, it is sectional drawing which shows the state just before completion of attachment to the engine of an engine cover. In embodiment, it is sectional drawing which shows the attachment completion state to the engine of an engine cover. In embodiment, it is sectional drawing which shows the relationship between the cap and attachment seat when an impact is added to the engine cover.

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

  1 to 4 show an engine cover mounting structure according to an embodiment of the present invention. 1 to 4, reference numeral 1 denotes an engine block constituting an automobile engine, and 3 denotes a resin engine cover. The engine block 1 is provided with a plurality of adapters 5 (only one appears in the figure) protruding upward as rod-shaped fixtures. The adapter 5 includes a round bar-shaped shaft portion 7 and a tip of the shaft portion 7. And a spherical bulging portion 9 which is formed in a spherical shape and constitutes the tip portion of the adapter 5. The adapter 5 is made of, for example, a resin made of nylon 6 or a metal made of carbon steel or the like.

  On the other hand, the engine cover 3 includes a cover main body 11, and a plurality of rectangular tube mounting seats 13 that open toward the engine block 1 correspond to the adapter 5 on the back surface of the cover main body 11 (in the drawing, FIG. (Only one appears.) Projected downward.

  The mounting seat 13 accommodates and holds a cap 15 having a spherical insertion hole 15a. The cap 15 is made of a resin made of, for example, 6 nylon. Then, the bulging portion 9 of the adapter 5 is press-fitted into the fitting hole 15 a of the cap 15, the engine cover 3 is attached to the engine block 1 via the cap 15 and the adapter 5, and the vibration of the engine is reduced. The cap 15 absorbs and attenuates.

  Near the projecting end edge (lower end edge) of the mounting seat 13, as shown in FIG. 5A, two horizontally-long rectangular engagement holes 13 a are formed so as to penetrate each other at intervals in the circumferential direction. ing. Note that the number of the engagement holes 13a is not limited to two and may be three or more. Further, the shape of the mounting seat 13 is not limited to a rectangular tube shape, and may be a cylindrical shape as in the modification shown in FIG.

  As shown in FIG. 6, the cap 15 includes a spherical head 17 having the fitting hole 15 a therein. The cap 15 protrudes in the middle in the vertical direction opposite to the outer surface of the spherical head 17 by 180 °. Two portions 17a are integrally projected, and a projecting piece 17b that engages with the engagement hole 13a is integrally projected horizontally on the overhang portion 17a. The protrusion 17b is set to be thinner in the vertical direction than the protruding portion 17a, and a step portion 17c is formed at the boundary between the upper surface of the protruding portion 17a and the upper surface of the protruding piece 17b.

  A skirt portion 19 is integrally formed at the lower end of the ball head 17, and the skirt portion 19 expands in a conical shape from the ball head 17, and the fitting hole 15 a is largely opened to the outside so that a wide space is formed inside. The boundary portion between the skirt portion 19 and the spherical head portion 17 is formed to form a constricted portion 15b. The inner diameter of the constricted portion 15 b is set smaller than the outer diameter of the bulging portion 9 of the adapter 5.

  Then, with the protruding piece 17b engaged with the engaging hole 13a and the cap 15 being accommodated and held in the mounting seat 13, the tip of the protruding portion 17a (step 17c) of the ball head 17 and the mounting seat 13 are secured. A gap c1 is formed between the inner peripheral surface (see FIG. 3). A gap c2 is also formed between the protrusion 17b and the inner peripheral edge of the engagement hole 13a (see FIG. 3). For this reason, the vertical thickness t of the protruding piece 17b is set smaller than the vertical opening dimension h1 of the engaging hole 13a, and the horizontal width w of the protruding piece 17b is It is set smaller than the opening dimension h2 in the horizontal direction of the engagement hole 13a (see FIG. 2). In FIG. 2, the gap c2 is formed on the upper and left and right sides of the projecting piece 17b and not on the lower side. However, depending on the manufacturing error of the mounting position of the engine cover 3, There may be a case where the gap c2 is formed, or the gap c2 is formed only on one of the left and right sides.

  Further, in a state where the cap 15 is accommodated and held in the mounting seat 13, the engine cover 3 is interposed between the back surface of the cover body 11 of the engine cover 3 and the ball head 17 of the cap 15 as shown in FIG. A moving space S is formed that allows the cap 15 to move upward when the projecting piece 17b is disengaged from the engaging hole 13a due to an impact applied to the cap 15.

  Further, two skirt portions 19 are formed continuously from the end of the skirt portion 19 to near the upper end of the spherical head 17 so that the slits 21 correspond to the protrusions 17b. When the end of 19 is picked with a finger and a force is applied, the ball head 17 and the skirt portion 19 are compressed, the width of the slit 21 is reduced, and the ball head 17 and the skirt portion 19 are deformed in the reduced diameter direction. It has become. The number of slits 21 is not limited to two, but may be one or three or more.

  In the process of being accommodated and held in the mounting seat 13, the cap head 15 and the skirt portion 19 are compressed to reduce the width of the slit 21, so that the ball head 17 and the skirt portion 19 are contracted. It is deformed in the radial direction and inserted into the mounting seat 13, the compression of the ball head 17 and the skirt portion 19 is released, and the width of the slit 21 is expanded, so that the ball head 17 and the skirt portion 19 are restored to the original. The shape 17 is restored to engage the projecting piece 17 b with the engagement hole 13 a of the mounting seat 13, and the skirt portion 19 comes into contact with the protruding end edge of the mounting seat 13.

  Further, when the bulging portion 9 of the adapter 5 is press-fitted into the fitting hole 15a from the skirt portion 19 of the cap 15, the constricted portion 15b between the skirt portion 19 and the spherical head 17 is provided. The outer cover is pressed outwardly to increase the width of the slit 21 and pass through the constricted portion 15b to be fitted into the fitting hole 15a. The engine cover 3 is attached to the engine block 1 via the cap 15 and the adapter 5. It has become.

  Next, a procedure for attaching the engine cover 3 to the engine block 1 will be described.

  First, the end of the skirt portion 19 of the cap 15 is picked with a finger, and the ball head 17 and the skirt portion 19 of the cap 15 are compressed to narrow the width of the slit 21 (see the phantom line in FIG. 7). As a result, the spherical head 17 and the skirt portion 19 are deformed in the reduced diameter direction to the extent that they do not contact the inner peripheral surface of the mounting seat 13.

  Next, the ball head 17 of the cap 15 is inserted into the mounting seat 13 from the protruding end side, and the picking force of the finger is loosened at the stage where the protrusion 17b corresponds to the engagement hole 13a. The compression of 19 is released, the width of the slit 21 is expanded, and the ball head 17 and the skirt portion 19 are restored to their original shapes. As a result, the projecting piece 17b engages with the engaging hole 13a, the skirt portion 19 abuts against the protruding edge of the mounting seat 13, and the cap 15 is accommodated and held at the opening center position of the mounting seat 13 (FIG. 7). (See solid line). In this state, a gap c <b> 1 is formed between the tip of the protruding portion 17 a (stepped portion 17 c) of the ball head 17 and the inner peripheral surface of the mounting seat 13. A gap c2 is also formed between the upper and left and right sides of the projecting piece 17b and the inner peripheral edge of the engagement hole 13a.

  Thereafter, the engine cover 3 is disposed above the engine block 1 so that the mounting seat 13 corresponds to the adapter 5 and the engine cover 3 is pressed against the engine block 1 as shown in FIG. As a result, the bulging portion 9 of the adapter 5 is press-fitted from the skirt portion 19 of the cap 15 into the fitting hole 15 a and is fitted. At this time, the bulging portion 9 presses the constricted portion 15b of the cap 15 radially outward to increase the width of the slit 21 (see FIG. 8), and passes through the constricted portion 15b and is fitted into the fitting hole. The engine cover 3 is attached to the engine block 1 via the cap 15 and the attachment seat 13 (see FIG. 9). Note that the skirt portion 19 is deformed in the diameter-reducing direction as the width of the slit 21 increases, and is restored to the original shape when the bulging portion 9 is fitted into the fitting hole 15a.

  On the other hand, in order to remove the engine cover 3 from the engine block 1, the engine cover 3 may be pulled upward and lifted, and the bulging portion 9 of the adapter 5 may be pulled out from the fitting hole 15 a of the cap 15. The behavior of the cap 15 at this time is the same as when the engine cover 3 is attached to the engine block 1.

  Thus, in the embodiment, since the slit 21 is continuously formed from the end of the skirt portion 19 to the ball head 17 in the cap 15, just by picking the end of the skirt portion 19 with a finger and applying force, The cap 15 can be easily attached to and detached from the mounting seat 13 by being deformed in the diameter reducing direction so as not to contact the inner peripheral surface of the mounting seat 13.

  In this embodiment, since the cap 15 is made of resin, the cap 15 is harder than that made of rubber, and when the bulging portion 9 of the adapter 5 is press-fitted into the fitting hole 15 a of the cap 15. When it is released from the pressing force, it can be restored to its original shape vigorously, and a reliable response (feeling of moderation) when press-fitted into the fitting hole 15a of the cap 15 can be obtained, and the engine cover 3 is in a normal state. You can be sure of knowing that it was attached.

  Furthermore, in this embodiment, the skirt portion 19 extends conically from the spherical head 17 and has a wide space inside, so that the bulging portion 9 of the adapter 5 is slid onto the inner peripheral surface of the skirt portion 19. It is possible to smoothly guide the cap 15 into the fitting hole 15a. Further, the thickness of the adapter 5 can be reduced compared with the case where the entire adapter 5 is in contact with the inner peripheral surface of the fitting hole of the cap 15, the material cost can be reduced, and the light and inexpensive cap 15 can be obtained.

  In addition, in this embodiment, the cap 15 is positioned at the center of the opening of the mounting seat 13 in a state where the cap 15 is housed and held in the mounting seat 13, and the tip of the overhanging portion 17 a (stepped portion 17 c) of the ball head 17. A clearance c1 is formed between the mounting seat 13 and the inner peripheral surface, and the vertical thickness t of the protruding piece 17b is set smaller than the vertical opening dimension h1 of the engaging hole 13a. Since the horizontal width w is set smaller than the horizontal opening dimension h2 of the engagement hole 13a and the gap c2 is formed between the projecting piece 17b and the inner peripheral edge of the engagement hole 13a, the engine cover 3 Even if the mounting position is slightly changed due to a manufacturing error or the like, the relative position between the spherical head 17 of the cap 15 and the mounting seat 13 can be finely adjusted by absorbing the position shift due to the fluctuation in the gaps c1 and c2. At this time, since the skirt portion 19 is pressed against the protruding end edge of the mounting seat 13, it is possible to prevent the engine cover 3 from rattling and to increase the vibration damping capability.

  Furthermore, in this embodiment, since the moving space S is formed between the back surface of the cover body 11 of the engine cover 3 and the spherical head 17 of the cap 15 in a state where the cap 15 is accommodated and held in the mounting seat 13, the engine When an impact is applied to the cover 3 and the projecting piece 17b of the cap 15 is removed from the engagement hole 13a of the mounting seat 13, the cap 15 moves through the moving space S and approaches the back surface of the cover body 11, and at this time, the projecting piece 17b Since the skirt portion 19 slides while being pressed against the inner peripheral surface of the mounting seat 13, the ball head portion 17 does not strike the back surface of the cover body 11 vigorously, and the shock can be efficiently absorbed and attenuated.

  The present invention is useful for a mounting structure for attaching an engine cover to an engine.

1 Engine block (engine)
3 Engine cover 5 Adapter (mounting tool)
7 Shaft part 9 Swelling part (tip part of fixture)
11 Cover body 13 Mounting seat 13a Engagement hole 15 Cap 15a Insertion hole 15b Constricted part (boundary part)
17 Ball head 17b Projection piece 19 Skirt portion 21 Slit c1, c2 Gap h1 Opening dimension h2 of the engagement hole in the vertical direction Opening dimension S of the engagement hole in the horizontal direction S Movement space t Thickness in the vertical direction of the projection piece w Projection piece Horizontal width of

Claims (3)

A cap (15) having a fitting hole (15a) is accommodated and held in a cylindrical mounting seat (13) projecting from the back surface of the cover body (11) of the engine cover (3) and projecting from the engine (1). The tip of the rod-shaped fixture (5) thus formed is press-fitted into the fitting hole (15a) of the cap (15), and the engine cover (3) is inserted through the cap (15) and the fixture (5). Engine cover mounting structure to be mounted on the engine (1)
Near the protruding edge of the mounting seat (13), a plurality of engagement holes (13a) are formed at intervals in the circumferential direction,
The cap (15) has a plurality of projecting pieces (17b) engaged with the engaging hole (13a) on the outer surface and a spherical head (17) having the fitting hole (15a) inside, It is made of resin and has a skirt portion (19) that extends conically from the spherical head (17) and opens the fitting hole (15a) to the outside, and at least one slit (21) has the skirt portion ( Formed continuously from the terminal of 19) to the ball head (17),
The fixture (5) comprises a shaft portion (7) and a spherical bulge portion (9) that forms a bulge shape at the tip of the shaft portion (7) and forms the tip portion,
In the process of accommodating and holding the cap (15) in the mounting seat (13), the ball head (17) and the skirt (19) of the cap (15) are compressed to reduce the width of the slit (21). Then, the spherical head (17) and the skirt (19) are deformed in the direction of diameter reduction and inserted into the mounting seat (13), and the compression of the spherical head (17) and the skirt (19) is released. By expanding the width of the slit (21), the spherical head (17) and the skirt (19) are restored to their original shapes, and the protrusion (17b) is engaged with the mounting seat (13). Engage the hole (13a),
When the bulging portion (9) is press-fitted into the fitting hole (15a) from the skirt portion (19) of the cap (15), the skirt portion (19) and the ball head (17) The boundary portion (15b) is pressed radially outward to increase the width of the slit (21) and pass through the boundary portion (15b) to be fitted into the fitting hole (15a), and the engine cover (3 ) Is attached to the engine (1) via the cap (15) and the fixture (5). The engine cover mounting structure according to claim 1,
In a state where the cap (15) is accommodated and held in the mounting seat (13), the skirt portion (19) abuts against the protruding edge of the mounting seat (13), and the ball head (17) and the mounting seat ( 13) A gap (c1) is formed between the inner peripheral surface and
The vertical thickness (t) of the protruding piece (17b) is set smaller than the vertical opening dimension (h1) of the engaging hole (13a) and the horizontal direction of the protruding piece (17b). The width (w) of the engagement hole (13a) is set smaller than the horizontal opening dimension (h2), and a gap is also formed between the projecting piece (17b) and the inner periphery of the engagement hole (13a). An engine cover mounting structure in which (c2) is formed. The engine cover mounting structure according to claim 1 or 2,
In a state where the cap (15) is accommodated and held in the mounting seat (13), between the back surface of the cover body (11) of the engine cover (3) and the ball head (17) of the cap (15), A mounting space (S) for allowing movement of the cap (15) when the projecting piece (17b) is removed from the engagement hole (13a) by impact is formed. Construction.

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