JP2013002464A - Attaching structure of stop plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attaching structure of a stop plug capable of securely attaching the stop plug to an opening without causing damage to the stop plug, at the opening in an engine mounted on a vehicle or the like.SOLUTION: In the attaching structure of the stop plug for attaching the roughly columnar stop plug to the opening formed across both members on a joining surface where the first member and the second member join each other, the opening is formed of a first opening provided through the first member and a second opening provided through the second member, the axis of the opening passes the first opening, and the inner diameter of the second opening is larger than that of the first opening.

Description

  The present invention relates to a stopper plug mounting structure for mounting a stopper plug for closing an opening such as a through hole or a recess to the opening.

  Conventionally, various stoppers have been proposed for waterproofing and soundproofing by being inserted into an opening (see, for example, Patent Document 1).

  Such a closing plug is used, for example, for the purpose of soundproofing, for example, also in the internal structure of automobiles produced in recent years. In other words, in the case of an automobile equipped with an idling stop function, cranking for starting the engine is performed more during driving. Therefore, in recent years, it has been considered that an opening provided in an oil pan or a gear case attached to an engine cylinder block is closed with a closing plug. This is to prevent the cranking sound from leaking to the outside or the driver's seat.

  However, the conventional stoppers including the stoppers described in Patent Document 1 are formed so as to be easily assembled mainly using the elasticity and flexibility of the material, and prevent the stoppers from coming off. Even when the holding function is included, it is performed only by the elasticity and flexibility of the material or the friction of the material surface. If this is the case, especially when a stopper plug is used in the vicinity of the engine of an automobile, vibration of the engine itself or vibration during running is remarkable. If the holding function is increased by flexibility or flexibility, there is a concern that it will be difficult to assemble or the load on the stopper plug itself will increase.

  By the way, when the opening is formed in the joint surface of the portion of the opening in the engine described above that is matched with two members, for example, the gear case and the oil pan, the center of the opening comes to the joint surface. It is common to make openings in However, when the opening is made in this way, if the opening is displaced due to an assembly error, a corner is formed on the mating surface side of the opening. When a corner is formed in this way, the stopper plug contacts the corner, and the stopper plug may be damaged.

JP 2010-272351 A

  Therefore, the present invention pays attention to the above points, and an object of the present invention is to provide a closing plug mounting structure that can be securely mounted to an opening without damaging the closing plug.

  That is, the attachment structure of the closure plug according to the present invention is the attachment structure of the closure plug in which the substantially cylindrical closure plug is attached to the opening formed on the mating surface where the first member and the second member are joined to each other. The opening is composed of a first opening provided in the first member and a second opening provided in the second member, and the axis of the opening is located in the first opening, and the second opening The inner diameter of the first opening is larger than the inner diameter of the first opening.

  According to such a configuration, even when an attachment error (alignment error) occurs on the mating surface where the first member and the second member meet, the axis of the opening is located at the first opening, so the first Even if the edge of the opening has an angle toward the inside of the opening, it does not come into contact with the closing plug. Therefore, the stopper plug is not damaged. This means that even if a corner is generated, it is not necessary to delete the corner by machining. Therefore, an increase in manufacturing cost can be suppressed.

  The present invention is configured as described above, and when assembling the first member and the second member, even if an attachment error occurs in each opening, the closing line is not damaged. Can be attached to the opening.

The top view which shows the whole structure of embodiment of this invention. The figure which made the mating surface of the oil pan of the embodiment the front. The top view of the opening of the embodiment. The front view of the closure plug in the embodiment. Sectional drawing of the closure plug in the embodiment. Action | operation explanatory drawing of the closure plug in the embodiment. Action | operation explanatory drawing of the closure plug in the embodiment. The figure which expands and shows the principal part in FIG. FIG. 3 is a view corresponding to FIG. 3 of another embodiment of the present invention. Action | operation explanatory drawing which concerns on the modification of the closure plug in embodiment of this invention.

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

  As shown in FIG. 1, the present embodiment is implemented at a location where a gear case g that is a first member constituting an engine and an oil pan p that is a second member are joined. In the figure, other components such as a cylinder block constituting the engine and components assembled to the gear case g are omitted for the sake of convenience, and only the oil pan p and the gear case g are shown.

  In the structure in which the gear case g and the oil pan p are joined, two joints k in which a tool for fastening a bolt b (FIG. 2) for joining the oil pan p and a cylinder block (not shown) can be inserted are provided at the joint portion. Provided. The opening k is closed by a substantially cylindrical stopper 1 after the work.

  As shown in FIG. 3, the opening k includes a first opening k1 provided in the gear case g and a second opening k2 provided in the oil pan p. The first opening k1 has a shape in which the axis a1 is disposed at a position that is biased inward from the mating surface g1 of the gear case g. That is, the first opening k1 is formed by an arc part k12 centered on the position of the axis a1 and a linear part k13 extending from the arc part k12 to the mating surface g1. The diameter of the arc portion k12 is set to be substantially equal to the outer diameter of the first claw portion 22 of the closing plug k, specifically corresponding to the outer dimension of the closing plug 1 that closes the opening k. With such a shape, the inner diameter of the first opening k1, in other words, the inner method in the width direction at the mating surface position of the first opening k1, is equal to the diameter of the arc portion k12. An angle k14 is formed at a position where both straight line portions k13 intersect at substantially right angles to the mating surface g1.

  With respect to such a first opening k1, the second opening k2 becomes a through hole whose inner periphery is closed with the first opening k1 when the oil pan p is joined to the gear case g. The second opening k2 is an arc having a larger diameter than the arc k2 of the first opening k1. The center of the arc is outside the mating surface p1 of the oil pan p, in other words, on the gear case g side. As a result, the inner diameter of the second opening k2 in the width direction at the mating surface position is larger than that of the first opening k1. A portion (hereinafter referred to as a chamfered portion) k22 that intersects the mating surface p1 of the second opening k2 is chamfered. The chamfering is performed by a mold at the time of casting. The chamfering may be performed by cutting.

  The depth of the second opening k2 is smaller than the depth of the first opening k1. The depth of the second opening k2 varies depending on the position of the first opening k1 in the depth direction of the first opening k1 in the first opening k1. That is, the depth of the second opening k2 is the radius of the arc part k12 of the first opening k1 from the position of the axis a1 of the first opening k1 when the opening k is formed by being abutted with the first opening k1. Is almost the same. By setting the depth as described above, the inner method of the opening k, in other words, the apparent diameter becomes substantially equal to the diameter of the arc portion.

  In such a configuration, when the gear case g and the oil pan p are joined, the gear case g and the oil pan p are placed on the mating surface of the gear case g and the oil pan p by the first opening k1 and the second opening k2. An opening k is formed over the. In this case, regardless of the assembled state of the gear case g and the oil pan p, in other words, even if a slight error occurs, the corner k14 of the first opening k1 is exposed in the opening k. However, the angle k14 existing on the first opening k1 side can be regarded as having no angle k14 for the stopper plug 1 because the axis a1 of the opening k is located in the first opening k1. it can.

  Since the axis of the opening k is located at the internal position of the first opening k1, the closing plug 1 is inserted in accordance with the axis a1. In this case, even if the corner k14 of the first opening k1 is exposed, the axis a1 of the opening k is located in the first opening k1, so that the closing plug 1 is at the corner of the first opening k1. There is no contact with k14. Therefore, the stopper plug 1 can be reliably inserted into the opening k without being damaged by the corner k14. Moreover, since the opening k can be made small by forming the chamfered portion k22 in the second opening k2, it is possible to reduce sound leakage from the gear case g side.

  The stopper plug 1 applicable to this embodiment will be described.

  As shown in FIG. 4, the bolt hole b provided on the gear case g side in the oil pan p is positioned so as to be covered by the lower end portions of the joint surfaces p1 and g1. Therefore, by providing the opening k, the cylinder block and the oil pan p can be firmly fastened at the position of the bolt hole b without interference with the gear case g and the oil pan p.

  After tightening the bolt using the opening k, the opening k is closed by the closing plug 1 to effectively avoid the leakage of engine operation sound, particularly cranking sound that occurs near the flywheel. Yes. As a result, the cranking sound including the time of restart from the idling stop is less likely to be noticed by the vehicle occupant such as the driver.

  The closing plug 1 is formed by, for example, rubber integral molding, and the rubber thicknesses are partially different from each other, thereby easily elastically deforming at the time of assembling / removing operation, and the elastic deformation hardly occurring. And have. The closing plug 1 has a head 3 that can close the opening k from the outside, and an insertion shaft 2 that extends from the head 3 and is inserted into the opening k.

  The head 3 has a circular shape in a plan view, and a pressed surface 31 that is pressed by a finger or the like when assembling a surface that is exposed when attached to the opening k, and an outer peripheral portion on the back side of the pressed surface 31 The contact surface 32 for positioning the stopper plug 1 to the position of the insertion end by contacting the edge of the opening k when the pressed surface 31 is pressed.

  As shown in FIGS. 4 and 5, the insertion shaft 2 protrudes from the inside of the contact surface 32 in a cylindrical shape with a predetermined diameter 21 a and protrudes outside the shaft body 21. The first claw part 22, the second claw part 23, and the auxiliary claw part 24 are configured. The outer diameter 21a of the shaft body 21 is set to be smaller than the opening diameter ka, in other words, the diameter of the arc portion k12 of the first opening k1. Specifically, the projection size of the first claw portion 22 is set to be small. A hollow portion 25 is formed inside the shaft main body 21 and is hollowed out in a cylindrical shape from the distal end portion to the vicinity of the proximal end. This hollow portion 25 functions as so-called “meat stealing”. That is, the hollow portion 25 can effectively reduce the weight of the stopper plug 1 itself, and can allow an appropriate elastic deformation of the shaft body 21 itself.

  The shaft main body 21 is provided with a first claw portion 22, a second claw portion 23, and an auxiliary claw portion 24 protruding in this order from the tip on the outside thereof.

  The first claw portion 22 protrudes to the position where it can contact the opening k on the outer side at the tip of the shaft body 21. That is, the diameter 22a of the first claw portion 22 is substantially equal to the opening diameter ka. The first claw portion 22 is adjusted so as not to bend and deform in a normal assembling operation by making the thickness dimension correspond to the protruding dimension.

  The second claw portion 23 is provided at a location adjacent to the proximal end side of the first claw portion 22. The diameter 23a of the second claw portion 23 is set so that the outer edge is larger than the opening diameter ka. And the protrusion position of the 2nd nail | claw part 23 is set to the distance smaller than the protrusion dimension of the 2nd nail | claw part 23 with respect to the 1st nail | claw part 22, specifically, about a half of the protrusion dimension. Thereby, when the front end 27 of the second claw portion 23 is bent toward the front end side of the insertion shaft 2, the front end 26 of the first claw portion 22 can be overlaid from the outside. On the other hand, since the second claw portion 23 is separated from the auxiliary claw portion 24 adjacent to the proximal end side by a size close to the projecting dimension, the second claw portion 23 has an opening k when bent toward the proximal end side. It can be suitably accommodated inside.

  Three auxiliary claw portions 24 are provided at a predetermined interval from the second claw portion 23 as described above. In the present embodiment, the shape and dimensions of the auxiliary claw portions 24 are both set to be substantially the same as that of the second claw portion 23. The distance between the auxiliary claw portions 24 is set so as to be separated from each other by a size close to the protruding size. As a result, these auxiliary claw portions 24 are appropriately bent in the opening k so as to be in contact with the opening k without gaps, and can effectively achieve waterproofing and soundproofing effects. Also, the second claw portion 23 is set so as not to interfere. Therefore, these auxiliary claw portions 24 can contribute to a suitable positioning into the opening k and can contribute to a particularly smooth insertion operation of the stopper plug 1.

  Next, with reference to FIGS. 6 to 8, actions that occur during the assembly of the stopper plug 1 and the extraction operation will be described.

  FIG. 6 illustrates a state in which the stopper plug 1 is inserted into the opening k. As shown in the figure, the first claw portion 22 is inserted into the opening k without substantially interfering with the opening k, and the second claw portion 23 and the auxiliary claw portion 24 are respectively bent toward the proximal end side. , Promptly inserted into the opening k. Therefore, the second portion 23 and the auxiliary claw 24 are not damaged by the corner k14.

  FIG. 7 illustrates a state where the pulling-out operation is performed from the state where the stopper plug 1 is positioned in the opening k. FIG. 8 is an enlarged view of a main part of FIG. As shown in the figure, when the first claw part 22 and the second claw part 23 that have passed through the opening k are pulled back into the opening k again, the tip 27 of the second claw part 23 bent toward the tip side is The top end 26 of the one claw portion 22 is overlaid from the outside. At this time, the diameter x of the insertion shaft 2 itself at the multi-layer location exceeds the opening diameter ka. If it becomes so, it will be in the state where the 2nd nail | claw part 23 and the 1st nail | claw part 22 were prohibited from penetrating into the opening k again. As a result, like the above-described embodiment, the stopper plug 1 can be stably positioned with respect to the opening k. Needless to say, if the operator applies an excessive external force until the shaft main body 21 itself bends and deforms, the stopper plug 1 is pulled out from the opening k.

  In this way, the closing plug 1 operates so that the second claw portion 23 overlaps the first claw portion 22 during the operation of pulling out the closing plug 1, so that the diameter x of the overlapping portion is opened. Since it becomes larger than the diameter ka, the withdrawal of the closing plug 1 is prohibited. As a result, at the time of assembly, the second claw portion 23 and the auxiliary claw portion 24 are easily deformed by the elastic deformation, and are difficult to come off. That is, the stopper plug 1 is difficult to be removed from the opening k due to vibration caused by the operation of the engine, impact during driving of the automobile, or the like.

  In particular, as the nail portion, the first nail portion 22, the second nail portion 23, and the auxiliary nail portion 24 are provided with a total of five nail portions, and the nail portion provided at the tip is the first nail portion 22, This can contribute to smooth insertion of the stopper plug 1 into the opening k. Of course, an excellent positioning effect due to the three auxiliary claw portions 24 engaging with the opening k is also exhibited during assembly.

  In addition, this invention is not limited to the said embodiment.

  The second opening k2 does not have the shape of the chamfered corner shown in the above embodiment, and when the gear case g and the oil pan p are joined without error as shown in FIG. Any size may be used as long as it is located outside the one opening k1. That is, the inner diameter of the second opening k2, and thus the width dimension of the second opening k2 at the mating surface p1 may be larger than that of the first opening k1. Constituent elements corresponding to the constituent elements in the embodiment are given the same reference numerals, and detailed description thereof is omitted.

  The first opening k1 may be provided in the oil pan p and the second opening k2 may be provided in the gear case g.

  The closure plug 1 used in the above embodiment may have the configuration shown in FIG. In addition, in a modification, while attaching | subjecting the same code | symbol to the component equivalent to the component in the said embodiment, the detailed description shall be abbreviate | omitted.

  In this example, the same stopper plug as described above is provided in the opening k having a depth dimension equal to or larger than the extension dimension of the shaft body 21, not the opening k through which the first claw portion 22 can pass through the tip of the shaft body 21. The operation when 1 is applied will be described.

  As shown in the figure, the first claw portion 22 is positioned inside the opening k. Thereby, the first claw portion 22 is elastically deformed. Of course, in the opening k, the diameter x of the first claw portion 22 and the second claw portion 23 at the layered portion cannot exceed the opening diameter ka. However, the leading end of the second claw portion 23 is in a state in which the pulling-out operation is remarkably restricted due to the strong action of entering between the opening k and the leading end of the first claw portion 22. As a result, like the above-described embodiment, the stopper plug 1 can be stably positioned with respect to the opening k. Of course, if the operator applies an excessive external force until the shaft main body 21 itself bends and deforms, the closing plug 1 is pulled out from the opening k.

  Further, for example, in the above embodiment, the diameter of the first claw portion is equal to the opening diameter, but of course, even if the diameter of the first claw portion is equal to or smaller than the opening diameter, or for example, larger than the opening diameter, If the diameter has a size that does not affect the insertion into the opening, the above effect can be effectively obtained as the first claw portion according to the present invention. Also, for example, in the above-described embodiment, an aspect applied to an opening formed in a perfect circle shape is disclosed, but of course, the embodiment is applied to various openings such as a rectangular shape, a polygonal shape, a groove shape, and an annular shape. May be. And in the said embodiment, although the nail | claw part was formed over the perimeter of the axis | shaft main body, of course, a nail | claw part may be provided intermittently in both a 1st claw part and a 2nd claw part, or a part. May be provided, or may be provided separately. Moreover, specific aspects, such as the material used for a closure plug and the protrusion dimension of a nail | claw part, are not limited to the thing of the said embodiment, The thing of various aspects including an existing thing is applicable.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  The present invention can be used to close an opening such as a through hole or a recess with a closing plug, and can also be used in other than the automobile engine described above.

DESCRIPTION OF SYMBOLS 1 ... Closure a1 ... Axis g ... Gear case k ... Opening k1 ... 1st opening k2 ... 2nd opening p ... Oil pan

Claims (1)

A stopper plug mounting structure in which a substantially cylindrical stopper plug is attached to an opening formed over both members on a mating surface where the first member and the second member are combined.
The opening is composed of a first opening provided in the first member and a second opening provided in the second member,
The axis of the opening is located in the first opening,
A stopper plug mounting structure in which the inner diameter of the second opening is larger than the inner diameter of the first opening.

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