JP5215151B2 - Mounting structure for rubber packing for sealing - Google Patents

Description

  The present invention relates to a rubber packing mounting structure for sealing, which is used in a structure in which two members are joined (connected) while holding a seal via a rubber packing.

  For example, a resin case (case body) that accommodates a circuit board is provided with a resin cover at the board insertion port after the circuit board is accommodated, and a seal (airtight or liquid tight) is provided on the internal wiring or the like. Some are configured to be retained. When attaching such a cover, a rubber seal for sealing is interposed between the cover insertion opening of the case main body and the cover, and it is compressed and deformed to secure the seal using the elasticity of rubber. A configuration is known. In such a cover, a projecting portion such as a cylindrical portion or a projecting portion is provided in a projecting manner on the surface facing the substrate insertion port of the case body, and this projecting portion is connected to the inner periphery of the substrate insertion port of the case body. In the case of a structure fitted into the surface (internal fitting), a seal rubber packing may be interposed between the inner peripheral surface and the outer peripheral surface of the protruding portion to hold the seal.

  In order to obtain such a seal structure, a ring-shaped rubber seal for sealing is provided along the circumferential direction on either the outer peripheral surface of the protrusion of the cover or the inner peripheral surface of the board insertion port of the case body. Usually, it is attached by being fitted or arranged in advance. Of these, the rubber packing is attached to the outer peripheral surface of the protruding portion of the cover in advance along the circumferential direction by fitting the rubber packing into the outer peripheral surface of the protruding portion of the cover from its tip side. It will be. And the protrusion part of this cover is pushed so that it may fit in the board | substrate insertion port of a case main body. In addition, as a document known technique that employs such a basic structure, a waterproof material (rubber packing) is attached to the outer peripheral surface of the protruding portion (terminal block gripping cylinder portion) protruding outward in the case, There is one in which a waterproof cover is relatively fitted and attached to the outside (for example, Patent Document 1).

  By the way, in order to fit and attach the rubber packing from the front end side to the outer peripheral surface of the protruding portion of the cover as described above, the rubber packing is held in a ring shape so as to match the contour of the outer peripheral surface of the protruding portion, After being fitted to the surface, or a part thereof being fitted to the outer peripheral surface, it is moved by being pushed toward the base end side of the protruding portion. Accordingly, the shape of the inner diameter or inner peripheral surface of the rubber packing is in a shape and size that matches the contour of the outer peripheral surface of the protruding portion before it is stretched in the circumferential direction or in a free state, or slightly larger than the contour. Therefore, if it is formed so as to match its shape and size, the rubber packing can be easily attached to the protruding portion.

  However, the rubber packing having such a dimensional relationship cannot be attached to the protruding portion in a tightened state. Therefore, the attachment position of the protruding portion of the rubber packing may be shifted in each process such as transporting the attached cover to the step of attaching the cover to the board insertion opening of the case body. In some cases, the rubber packing may be separated or dropped off during the process of attaching the cover. In such a case, the subsequent cover mounting operation cannot be performed smoothly, or a situation in which the cover cannot be mounted is caused.

On the other hand, as means for solving such problems such as misalignment and separation of the rubber packing, when the rubber packing is attached to the protruding portion, the rubber packing is attached to the protruding portion so as to extend in an appropriate amount in the circumferential direction. What should I do? This is because, in such an attached state, the rubber packing tightens the protruding portion with an appropriate force by its contraction force. And in order to obtain such a mounting state, the inner diameter of the inner peripheral surface of the ring-shaped rubber packing before mounting, or the peripheral length of the inner peripheral surface, the outer diameter of the outer peripheral surface of the protruding portion, or the outer peripheral surface An appropriate amount should be made smaller than the perimeter. However, in order to attach the rubber packing having such a dimensional relationship to the outer peripheral surface of the projecting portion, it is necessary to extend the rubber packing in the circumferential direction or to increase the diameter during the attachment.
Refer to FIG. 10 of JP2007-280697A

  That is, in the case of using the rubber packing of the dimensional relation as described above, before fitting the rubber packing into the protruding portion, the rubber packing is stretched in the circumferential direction against its elasticity in advance. It is necessary to enlarge the diameter a little larger than the contour of the outer peripheral surface. Then, the rubber packing held in such an expanded state is set so as to fit in the portion near the tip of the protruding portion, and then the expanded state is released to a contracted state, and then pushed to a predetermined position on the proximal end side. Work. Or it becomes an operation | work which carries out the external fitting from the front end side of a protrusion part, cancels | releases a diameter expansion state, after moving to the predetermined position in a protrusion part with the diameter expansion state.

  For this reason, when attaching the rubber packing to the protruding portion, a diameter expansion device or a diameter expansion tool (or jig) is required as a diameter expansion means of the rubber packing. Therefore, there has been a problem that the process required for attaching the rubber packing is increased or complicated, resulting in an increase in the installation cost.

  Such a problem becomes particularly problematic when the protruding portion to which the rubber packing is attached is not circular but protrudes in a non-circular shape such as a rectangle, an ellipse, or an oval. This is because the rubber packing needs to be expanded in accordance with the shape of the tip of the protruding portion (contour shape of the tip), and therefore, a dedicated diameter expanding device is often required. . Moreover, when fitting and mounting such a rubber packing, the rubber packing holding this expanded diameter state is appropriately moved so that it matches the contour at the tip of the protruding portion to be fitted. Since it is necessary to fit in while adjusting the position, the operation becomes complicated. Such a problem is not limited to the case of obtaining a rubber packing mounting structure for a seal in the cover as described above. In other words, the same can be said for a structure other than such a cover in which a rubber packing for sealing is attached to a protruding portion formed so as to protrude from a predetermined member.

  The present invention has been made in view of these problems, and when fitting a rubber packing having a ring shape from the front end side onto the outer peripheral surface of the protruding portion of a predetermined member, the present invention is suitable for the protruding portion after mounting. In order to obtain a sufficient tightening force, the rubber packing must be easily and quickly installed without the need for a special device or jig to stretch or expand the diameter in the circumferential direction in advance. It is in. The present invention for achieving the object is the following means.

According to the first aspect of the present invention, there is provided a rubber packing for sealing, in which a ring-shaped rubber packing is fitted and attached to the outer peripheral surface of a protruding portion protruding outward from a predetermined member. In the mounting structure of
Of the outer peripheral surface of the protrusion, a certain region from the tip to the base end is formed as an inclined surface so that the diameter decreases toward the tip , and the region other than the certain region is in the protrusion direction of the protrusion. While having an outer peripheral surface parallel to the drawn virtual axis X ,
The rubber packing is capable of fitting the end of the fitting start side into the region of the inclined surface without being stretched in the circumferential direction at the start of fitting into the protruding portion, and the rubber packing is relatively protruded. It is formed so as to be expanded and attached on the inclined surface by being pushed toward the base end side of the part , and on the inner peripheral surface of the rubber packing, the opposite side from the end on the fitting start side The constant region toward the end is formed on the inclined surface so as to expand toward the end on the fitting start side,
The rubber packing is characterized in that the rubber packing is attached to a parallel outer peripheral surface of the projecting portion other than the fixed region in a tightened state, except for the fixed region .

  The following can be illustrated as rubber packing in Claim 1. That is, when the rubber packing is started to be fitted into the protruding portion, the rubber packing is placed on the fitting start side so that the end of the fitting start side or the portion near the end is in contact with the inclined surface without being stretched in the circumferential direction. This is a case where the inner diameter or the peripheral length (peripheral length) of the inner peripheral surface at the end or the portion near the end is formed. In terms of the relationship between the outer diameter of the protrusion and the inner diameter of the rubber packing, the outer diameter of the tip of the inclined surface is D1, and the proximal end of the inclined surface (starting point of inclination). ) Is the outer diameter of D2, and the inner diameter of the rubber packing before fitting into the protruding portion at the end of the rubber packing into the protruding portion or the portion near the end is set as D3, each of D1, D2, and D3 This is a case where the dimensions are held in a relationship of D1 <D3 <D2.

  More specifically, for example, if the outer peripheral surface of the protruding portion is cylindrical, and the rubber packing is also formed in a circular ring shape and has a self-holding property, the inner peripheral surface of the rubber packing in a free state Among them, for example, when the inner diameter D3 of the end on the fitting start side is smaller than the outer diameter D2 at the proximal end of the inclined surface in the outer peripheral surface of the protruding portion, and is larger than the outer diameter D1 at the distal end of the protruding portion It is. In addition, when the contour of the outer peripheral surface of the protruding portion to which the rubber packing is attached is, for example, oval, elliptical, or rectangular (hereinafter also referred to as non-circular), the rubber packing itself is extremely low in hardness (soft). When there is no self-shaping property in a free state, or when it has a self-shaping property but is formed in an annular shape unlike a protruding portion, it is not easy to specify the relationship. In such a case, the peripheral lengths L1 and L2 along the outer peripheral surface at the measurement locations of D1 and D2 on the inclined surface of the protruding portion, and the peripheral length L3 of the inner peripheral surface of the rubber packing, for example, the end on the fitting start side. Is satisfied so that the relationship of L1 <L3 <L2 is satisfied.

Further, in the present invention, the projecting portion has a cross-sectional shape (contour) in the projecting direction except for a fixed region (range) from the tip to the base end formed on a chamfered inclined surface of the outer peripheral surface. It will be the same .

According to the first aspect of the present invention, a constant region of the inner peripheral surface of the rubber packing from the end on the fitting start side toward the opposite end thereof expands toward the end on the fitting start side. As described above, it is formed on the inclined surface .

According to the second aspect of the present invention, in the outer peripheral surface of the projecting portion, a certain region from the distal end to the proximal end is formed on the inclined surface so that the diameter decreases toward the distal end at an inclination angle α. While
Of the inner peripheral surface of the rubber packing, a constant region from the end on the fitting start side toward the opposite end is formed on the inclined surface so that the diameter increases toward the end on the fitting start side at an inclination angle β. And
2. The rubber packing mounting structure for sealing according to claim 1, wherein the inclination angles α and β are maintained in a relationship of α <β.

  In the present invention of claim 1, based on the configuration, when the rubber packing is fitted into the projecting portion, the end of the fitting start side is set to the inclined surface of the projecting portion without extending and expanding in the circumferential direction. Can be fitted in the area. Therefore, the fitting start state can be obtained without expanding the diameter. Then, by pushing the rubber packing in this state toward the base end side of the protruding portion, the diameter of the protruding portion is increased so that the rubber packing is extended in the circumferential direction by the wedge action using the inclined surface of the protruding portion. The attachment can be performed while deforming.

  As described above, in the present invention, at the start of fitting the rubber packing into the protrusion, at least the end of the fitting start side is formed at the tip of the protrusion without expanding the diameter with a dedicated device or jig. Can be fitted on an inclined surface. Then, by pressing the rubber packing in this state toward the proximal end side of the protruding portion, the rubber packing can be attached to the protruding portion while being deformed to have an enlarged diameter. As described above, according to the present invention, the rubber packing can be attached to the predetermined position of the protruding portion in a tightened state without using an independent device (tool) for expanding the diameter, a jig, or the like. Thus, a desired rubber packing mounting structure can be obtained.

  In the present invention, the smaller the angle of inclination on the inclined surface of the protruding portion and the shorter the region (dimension) in the protruding direction, the easier the pressing after the start of fitting of the rubber packing is. The force for tightening the protrusion is reduced. Therefore, in order to increase the tightening force, it is necessary to increase the amount of the rubber packing extending in the circumferential direction by increasing the inclination angle or lengthening the region where the inclined surface is provided in the protruding portion. On the other hand, it is necessary to increase the force required to push the rubber packing as the above is done. Therefore, the inclination angle of the inclined surface of the protruding portion or the size of the region may be appropriately set so that a necessary tightening state can be obtained after the rubber packing is attached to the protruding portion. Specifically, it may be set as appropriate within the range where there is no hindrance to the mounting due to the pushing, in relation to the elasticity, hardness or strength based on the material of the rubber constituting the rubber packing.

In the first aspect of the present invention, since the inclined surface is also provided on the fitting start side on the inner peripheral surface of the rubber packing, the fitting can be started more easily. Is planned. The inclined surface on the outer peripheral surface of the protrusion and the inclined surface on the inner peripheral surface of the rubber packing may be formed as a linear inclined chamfer or a curved chamfer such as an arc shape.

As in the second aspect of the present invention, when the inclination angles α and β are maintained in a relationship of α <β, the fitting of the rubber packing into the protruding portion can be more easily started. Therefore, the mounting can be further simplified and speeded up.

  The best mode for carrying out the present invention (first embodiment) will be described in detail with reference to FIGS. However, in this embodiment, as shown on the left side of FIG. 1, a resin cover (lid) that closes the board insertion port (opening on the left side of FIG. 1) 303 of the resin case (main body) 301 that houses the circuit board 201. ) 11 is embodied as a predetermined member. 1 is a cross-sectional view of the cover 11 closing the board insertion port 303 of the case 301 with the cover 11, and the case main body passing through the virtual axis X drawn in the protruding direction of the protruding portion 21 in the cover 11. FIG.

  As shown in FIG. 1, the cover 11 that is a predetermined member of the present embodiment includes a protruding portion 21 that protrudes outward on the surface of the case main body 301 that faces the board insertion port 303. A ring-shaped rubber packing 101 is attached to the outer peripheral surface 23 of 21. The protruding portion 21 of the cover 11 to which the rubber packing 101 is attached is fitted into the board insertion port 303 of the case main body 301 (internal fitting), so that the insertion port 303 is closed while holding the seal. Has been. That is, the ring-shaped rubber packing 101 is interposed between the inner peripheral surface 305 of the substrate insertion port 303 and the outer peripheral surface 23 of the protruding portion 21 by the fitting, and the rubber packing 101 is connected to the substrate insertion port 303. The dimensions of each part including the rubber packing 101 are set so as to be described later so as to be compressed in the radial direction between the inner peripheral surface 305 and the outer peripheral surface 23 of the protruding portion 21.

  The case body 301 shown in FIG. 1 has a board insertion port 303 formed in an oval shape (or a flat oval shape), so that the cover 11 has a base portion (substrate portion) as shown in FIG. ) 12 closes the board insertion opening 303 of the case main body 301, so that it is formed in the same oval shape as that. FIG. 2 is a partially omitted view of the cover 11 before the rubber packing 101 is attached, as viewed from the side of the case body 301 facing the board insertion port 303. As shown in FIGS. 1 to 3, the cover 11 protrudes in the cover base 12 in an oval shape in which the outer peripheral surface 23 is formed to be slightly smaller than the insertion port 303. In this example, a ring-shaped rubber packing 101 is attached to the outer peripheral surface 23 of the protrusion 21. In addition, although detailed description is abbreviate | omitted to the protrusion part 21 side of the cover 11, the terminal metal fitting insertion for inserting the several terminal metal fitting 251 connected with the terminal of the circuit board 201 accommodated in the case main body 301 is inserted. Part 25. Further, as shown in FIG. 1, when the cover 11 is attached to the cover 11 so as to close the insertion port 303 of the case main body 301, the cover base portion covers the outer peripheral surface 307 of the insertion port 303. A hood 27 is formed along the outer periphery of 12 so as to extend in the same direction as the protruding direction of the protruding portion 21. Further, although not described in detail, an appropriate number (four places) of fixing pieces 29 for preventing separation after the cover 11 is attached to the case body 301 is provided at appropriate positions along the circumferential direction of the hood 27. Further, a connector portion 30 is provided in a protruding shape on the side opposite to the protruding portion 21 side.

  Next, the protruding portion 21 of the cover 11 which is such a predetermined member and the state where the rubber packing 101 is attached to the protruding portion 21 will be described in more detail. As shown in FIG. 2, the cover 11 that is a predetermined member has an oval shape as described above when viewed from the side where the protruding portion 21 is provided (the board insertion opening 303 of the case body 301). The projecting portion 21 also has an elliptical shape that is slightly smaller. FIG. 3 shows an enlarged longitudinal sectional view passing through the virtual axis X drawn in the projecting direction of the projecting portion 21 before the cover 11 is attached to the board insertion port 303 of the case main body 301, and further enlargement of the main part thereof. FIG. That is, as shown in FIG. 3, the protruding portion 21 of the cover 11 has an outer peripheral surface 23 parallel to the virtual axis X drawn in the protruding direction. A rubber packing 101 having a ring shape is attached to the outer peripheral surface 23 of the protruding portion 21 from the tip 31 side of the protruding portion 21 to constitute a mounting structure of the rubber packing 101 for sealing. Note that the cover 11 when closing the board insertion port 303 of the case body 301 actually has a plurality of terminal fittings 251 inserted and fixed to the terminal fitting insertion portion 25, so that the metal fitting and the circuit board 201 are connected. However, in order to facilitate the explanation, these terminal fittings are omitted except for FIG.

  On the other hand, a constant region (range) H from the distal end (right end in FIG. 3) 31 to the base end 32 on the opposite side (left end in FIG. 3) of the outer peripheral surface 23 of the protrusion 21 is directed toward the distal end 31. Thus, the chamfered inclined surface 33 is formed along the circumferential direction so as to be reduced in diameter by a predetermined inclination angle (an angle formed between the virtual axis X and the inclined surface) α. However, the inclination angle α is in the range of 5 to 45 degrees in this example. Accordingly, the circumferential length of the tip P1 on this inclined surface 33 (the length along the circumferential direction of the intersecting ridge line between the inclined surface 33 and the tip (tip surface) 31) is L1, and the base of the protruding portion 21 on this inclined surface 33 is defined as L1. When the peripheral length at the end 32 side end (end opposite to the tip in the constant region H) P2 is L2, the relationship of L1 <L2 is maintained. The inclined surface 33 may be a curved line such as an arc that is convex or concave when cut along a plane that passes through the virtual axis X described above, but is formed so as to form a straight line in this example. As described above, when the cover 11 is attached to the case main body 301 (see FIG. 1), the protrusion 21 is fitted on the outer peripheral surface 307 of the board insertion port 303 as described above. A hood 27 is provided.

  Next, the ring-shaped rubber packing 101 in this embodiment will be described in detail. The rubber packing 101 is formed in a ring shape (mold molding) so as to follow the contour (oval shape, see FIG. 2) of the outer peripheral surface 23 of the projecting portion 21, and the inner peripheral surface 103 is projected. In the state attached to the outer peripheral surface 23 of the part 21, it forms so that the outer peripheral surface 23 may be fastened with moderate fastening force. The circumferential length of the inner circumferential surface 103 of the rubber packing 101 will be further described later in relation to the dimensions of L1 and L2. Further, in this embodiment, a fixed region G located on the left side of the inner peripheral surface 103 of the rubber packing 101 from the fitting start side end 105 toward the opposite side end 107 faces the fitting start side end 105. Thus, the chamfered inclined surface 109 is formed so as to expand its diameter with respect to the virtual axis X at a predetermined inclination angle β. In this example, the inclination angle β is set larger than the inclination angle α before being attached to the protruding portion 21 (free state). Further, in the present embodiment, the inclined surface 109 is linear. However, like the inclined surface 33 in the projecting portion 21, it may be a curved line such as an arc.

  In addition, the rubber packing 101 of this example has a plurality of rows of lips 111 provided on the outer peripheral surface 23 in a circumferential shape along the circumferential direction. As shown in FIG. 1, when the protruding portion 21 of the cover 11 is fitted into the board insertion port 303 of the case body 301, the lip 111 of the rubber packing 101 attached to the protruding portion 21 and the hood 27. The end of the case main body 301 on the side of the board insertion port 303 enters, and the tip (outer peripheral side) of the lip 111 is pressed against the inner peripheral surface 305 of the board insertion port 303 of the case main body 301 so that the seal is It is set to be retained. However, a flange 113 is formed on the left side of the lip 111 so as to protrude in the outer diameter direction from the lip 111, and in the protruding direction of the protruding portion 21 at the end of the board insertion port 303 of the case body 301. It is set to be compressed. The lip 111 is formed so that its outer diameter (projection amount) decreases toward the right end in FIG.

  The rubber packing 101 of this embodiment is fitted into the protruding portion 21 of the inner peripheral surface 103, that is, the inner peripheral surface 103, as shown in FIGS. 4 and 5 before being attached to the protruding portion 21. When the circumferential length at the diameter expansion start end (right end in FIG. 5) P3 of the chamfered inclined surface 109 formed on the start side is L3, in the relationship with L1 and L2, the relationship of L1 <L3 <L2 is satisfied. Is retained. In addition, when these dimensional relationships are represented by the diameters D1, D2, and D3 at the respective portions in FIGS. 5 and 7, D1 <D3 <D2. Therefore, as shown in FIG. 3, the rubber packing 101 is fitted into the outer peripheral surface 23 of the protruding portion 21 from the tip 31 side of the protruding portion 21, and the inclined surface 33 of the outer peripheral surface 23 of the protruding portion 21. Although attached to the parallel outer peripheral surface 23 on the left side of the figure than the region H, in this attached state, it basically extends in the circumferential direction by L2-L3. In other words, the rubber packing 101 attached to the protruding portion 21 is expanded by that amount based on the elasticity of the rubber, and tightens the outer peripheral surface 23 of the protruding portion 21.

  Now, a process of obtaining such a sealing rubber packing 101 mounting structure will be described with reference to FIGS. That is, when attaching the rubber packing 101 to the protruding portion 21 in this step, the end 105 on the fitting start side of the rubber packing 101 is positioned so as to correspond to the tip 31 of the protruding portion 21 as shown in FIG. Match. The rubber packing 101 of the present embodiment is compression-molded by a mold so as to have a self-retaining property in a shape corresponding to the contour shape of the outer peripheral surface 23 of the protruding portion 21, and is shown in FIGS. 4 to 6. As shown in FIG. 7, the operator holds the rubber packing 101 in his hand (not shown) and removes the end 105 on the fitting start side from the tip 31 or the outer peripheral surface 23 of the protrusion 21. Fit it. Then, from the dimensional relationship of L1, L2, and L3 described above, the rubber packing 101 has a fitting start side end 105 on the inner peripheral surface 103 with respect to the inclined surface 33 formed on the outer peripheral surface 23 of the protruding portion 21. The part to include fits (see FIG. 7). In other words, the diameter expansion start end P3 of the inclined surface 109 of the inner peripheral surface 103 of the rubber packing 101 comes into contact with each other, and an initial fitting state is established.

  Thus, in this embodiment, it is possible to start fitting the rubber packing 101 into the tip 31 of the protruding portion 21 without expanding the diameter using a separate dedicated device or jig. In this example, when such fitting of the rubber packing 101 is started, the illustrated right end P3 of the inclined surface 109 on the inner peripheral surface 103 on the fitting start side faces the proximal end 32 from the distal end 31 of the protruding portion 21. Of the region H in the inclined surface 33 formed in this manner, the region is set so as to be in contact with the tip 31 at an approximately middle position.

  Then, after such initial fitting, as shown in FIG. 8, the rubber packing 101 is slid so as to be relatively pushed toward the base end 32 side of the protruding portion 21. By doing so, the rubber packing 101 is stretched by its own elasticity or stretchability so as to receive a wedge action on the inclined surface 33 of the protruding portion 21 as shown in FIG. It is deformed so as to adapt to the surface 33. And by continuing the pushing, it moves to the base end 32 side finally as shown in FIG. 3, and the attachment in the state which the rubber packing 101 clamp | tightened the outer peripheral surface 23 of the protrusion part 21 is complete | finished. Thus, in this embodiment, when attaching the ring-shaped rubber packing 101 to the protruding portion 21, it is possible to easily hold the tightened state in the protruding portion 21 without using a special diameter expanding device or the like. Installation is done.

  After that, the cover 11 with the rubber packing 101 attached to the protruding portion 21 is pushed into the substrate insertion port 303 of the case main body 301 so that the substrate insertion is performed as in the conventional case. The mouth 303 can be closed. And even if the cover 11 passes through the process of conveyance and handling by the time of the closing process, it is effectively prevented that the rubber packing 101 moves or falls off at the protruding portion 21.

(Embodiment of reference invention different from the present invention )
Next, the present invention attached to (called reference embodiment) embodiment of another reference invention will be described with reference to FIG. However, this is different from the first embodiment described above only in the shape of the cross section of the ring portion (the cut portion of the line portion) in the rubber packing 101. For this reason, only the difference is demonstrated and it attaches | subjects only attaching | subjecting the same code | symbol to the same site | part. The same applies hereinafter. That is, in the above-described first embodiment, the fixed region G from the end 105 on the fitting start side toward the opposite end 107 on the inner peripheral surface 103 of the rubber packing 101 is extended to the protruding portion 21 along the circumferential direction. In the free state before mounting, the embodiment is embodied as a chamfered inclined surface 109 so that the diameter increases toward the end 105 on the fitting start side. On the other hand, in the embodiment of the reference invention different from the present invention shown in FIG. 9, the rubber packing 120 is embodied as not including the inclined surface 109 as in the above embodiment.

That is, in the embodiment of the reference invention different from the present invention shown in FIG. 9, when the rubber packing 120 starts to be fitted into the protruding portion 21, the inner circumferential surface 103 is not stretched in the circumferential direction. The portion of the ridge line P4 formed by the end (surface) 105 on the fitting start side is formed so as to be in contact with an intermediate point in the region H of the inclined surface 33 of the protruding portion 21. In the present embodiment , the circumferential length of the inner peripheral surface 103 at P4 is L3, and the relationship L1 <L3 <L2 is maintained. Accordingly, after the start of the fitting, the rubber packing 101 is pushed toward the base end 32 side of the projecting portion 21, so that the diameter thereof is increased by the inclined surface 33 and attached. Thereby, substantially the same effect as in the case of the first embodiment is obtained. This reference form is suitable when the tightening force after attaching the rubber packing 120 to the protrusion 21 may be small.

( Second Embodiment )
Next, another example ( second embodiment ), which may be called a modification of the first embodiment, will be described with reference to FIG. In the first embodiment, the chamfered inclined surface 109 is formed on the inner peripheral surface 103 of the rubber packing 101, and the inclination angle β and the inclination angle α of the inclined surface 33 in the protruding portion 21 are set such that α <β. The case where it hold | maintained to the relationship was illustrated. On the other hand, in the second embodiment shown in FIG. 10, on the contrary, both inclination angles are embodied as β <α. In this embodiment, as in the above reference embodiment , the portion of the ridge line (expansion side end) P4 formed by the inner peripheral surface 103 of the rubber packing 130 and the end (surface) 105 on the insertion start side, that is, the insertion of the inclined surface 109 is performed. When the circumferential length at the end 105 on the start side is L3, the relationship L1 <L3 <L2 is maintained. As a result, it is apparent that substantially the same effect as in the case of the reference embodiment can be obtained. In addition, the tightening force after the rubber packing 130 is attached to the protruding portion 21 increases as the peripheral length of the inner peripheral surface 103 decreases.

( Third embodiment )
Further, another example ( third embodiment ), which should be called a modification of the first embodiment, will be described with reference to FIG. In the first embodiment, the chamfered inclined surface 109 is formed on the inner peripheral surface 103 of the rubber packing 101, and the inclination angle β and the inclination angle α of the inclined surface 33 in the protruding portion 21 are set such that α <β. Hold in relationship. When the circumferential length at the right end P3 of the chamfered inclined surface 109 formed on the fitting start side with respect to the protruding portion 21 of the inner circumferential surface 103 of the rubber packing 101 is L3, L1 <L3 <L2 The relationship was maintained. In contrast, in the third embodiment , a chamfered slope formed on the fitting start side with respect to the protruding portion 21 of the inner circumferential surface 103 of the rubber packing 140 while maintaining the relationship of α <β. When the circumferential length at the intermediate position (intermediate point) P5 of the region G of the surface 109 is L3, the relationship of L1 = L3 is maintained. That is, the circumferential length L1 of the tip P1 on the inclined surface 33 of the protrusion 21 and the circumferential length L3 at the midway position P5 of the region G of the inclined surface 109 of the rubber packing 140 are the same.

  In this embodiment, at the start of fitting of the rubber packing 140 to the protruding portion 21, the rubber packing 101 is not stretched in the circumferential direction, and the end 105 on the fitting start side is fitted into the region H of the inclined surface 33. . Therefore, after that, the rubber packing 140 is formed so as to be attached by being expanded in diameter by the inclined surface 33 of the protruding portion 21 by being pushed toward the base end 32 side of the protruding portion 21. That is, in this example, at the start of fitting of the rubber packing 140 into the protruding portion 21, an intermediate position (intermediate point) P5 of the region G of the inclined surface 109 of the rubber packing 140 is located at the tip P1 of the inclined surface 33 of the protruding portion 21. Are brought into contact with each other, and initial fitting is performed, and by subsequent pushing, the inclined surface 109 formed on the fitting start side of the rubber packing 140 and the parallel inner peripheral surface 103 are formed along the inclined surface 33 of the protruding portion 21. The diameter is expanded and the attachment is performed. This embodiment is suitable when it is desired to ensure a large tightening force after the rubber packing 140 is attached to the protruding portion 21.

The structure for attaching the rubber packing for sealing according to the present invention is not limited to the above-described embodiments. In other words, in the present invention, an inclined surface is formed at the distal end portion of the outer peripheral surface of the protruding portion so as to reduce the diameter toward the distal end, while the rubber packing is stretched in the circumferential direction at the start of fitting into the protruding portion. Without being fitted, the end of the fitting start side or the portion close to the end can be fitted into the region of the inclined surface of the protruding portion, and the rubber packing is relatively pushed toward the proximal end side of the protruding portion. In the inner peripheral surface of the rubber packing, a certain region from the end of the fitting start side toward the opposite end of the inner surface of the rubber packing is directed toward the end of the fitting start side. It is only necessary to be formed on the inclined surface so as to expand the diameter . Therefore, various modifications can be made within the range.

  In each of the above embodiments, the predetermined member is a resin cover for closing the board insertion port of the case for mounting the circuit board, and the protrusion is embodied in a non-cylindrical one. The predetermined member is not limited to such a cover. Further, the shape of the protruding portion is not limited to this. The present invention can be widely applied as a structure for attaching a rubber packing for sealing, as long as it is a structure in which two members are joined (connected) while holding a seal via a rubber packing. As is clear from this, the predetermined member in the present invention only needs to have a protruding portion formed so that the rubber packing is fitted and attached in the attachment structure of the rubber packing for sealing. Further, the protruding portion only needs to have a shape and structure to which a ring-shaped rubber packing is attached to the outer peripheral surface, and therefore does not need to protrude as a cylindrical portion, but as a simple convex portion, What is formed so that it may protrude in a predetermined member may be used.

Moreover, the shape, form, and structure of the ring-shaped rubber packing can be embodied as appropriate. In each said form, the cross-sectional shape (cut part of a line part) shape of the ring part of rubber packing was materialized as what has a multi-row lip | rip in an outer peripheral surface. However, it is clear that the present invention is not limited to such a thing .

1 shows a first embodiment in which the present invention is embodied by using a predetermined member as a cover, and is a cross-sectional view of a state in which a cover insertion hole of the case body is closed by the cover, in the protruding direction of the protruding portion of the cover. The longitudinal cross-sectional view containing the case main body which passes 1 drawn virtual axis line, and the principal part enlarged view. The figure which looked at the cover which is a predetermined member of Drawing 1 from the projection part side. Before attaching a cover to the board | substrate insertion port of a case main body, the enlarged longitudinal cross-sectional view which passes along 1 virtual axis pulled in the protrusion direction of the protrusion part, and the further enlarged view of the principal part. The partially omitted enlarged cross-sectional view showing a state before the rubber packing is attached to the protruding portion of the cover which is a predetermined member. The enlarged view of the principal part in FIG. The perspective view which looked at the state before attaching rubber packing to the protrusion part in the cover which is a predetermined member from the rubber packing side. The figure explaining the process which begins to attach a rubber packing to the protrusion part in a cover in FIG. FIG. 8 is a diagram for explaining a process of pushing in after a rubber packing is attached to the protruding portion in FIG. 7. The principal part expanded sectional view before the attachment explaining embodiment of the reference invention different from this invention which changed the rubber packing. The principal part expanded sectional view before the attachment explaining 2nd Embodiment which changed the rubber packing. The principal part expanded sectional view before the attachment explaining 3rd Embodiment which changed the rubber packing.

11 Cover (predetermined member)
21 Protruding portion 23 Outer peripheral surface 31 Protruding portion distal end 32 Protruding portion outer peripheral surface proximal end 33 Protruding portion outer peripheral surface inclined surfaces 101, 120, 130, 140 Rubber packing 103 Rubber packing inner peripheral surface 105 Rubber End 109 of the packing fitting start side Inclined surface 107 of the rubber packing End P1 opposite to the end of the rubber packing insertion start end P2 Tip of the inclined surface of the protruding portion End H of the protruding portion on the base end side of the inclined surface H of the protruding portion Constant region G from the front end to the base end of the outer peripheral surface Constant region α from the end of the rubber packing fitting side to the opposite end α Inclination angle of the inclined surface of the protrusion β Inclination angle of the inclined surface of the rubber packing

Claims (2)

In the mounting structure of the rubber packing for the seal formed by fitting the rubber packing that forms a ring shape from the front end side of the protruding portion to the outer peripheral surface of the protruding portion protruding outward in the predetermined member,
Of the outer peripheral surface of the protrusion, a certain region from the tip to the base end is formed as an inclined surface so that the diameter decreases toward the tip , and the region other than the certain region is in the protrusion direction of the protrusion. While having an outer peripheral surface parallel to the drawn virtual axis X ,
The rubber packing is capable of fitting the end of the fitting start side into the region of the inclined surface without being stretched in the circumferential direction at the start of fitting into the protruding portion, and the rubber packing is relatively protruded. It is formed so as to be expanded and attached on the inclined surface by being pushed toward the base end side of the part , and on the inner peripheral surface of the rubber packing, the opposite side from the end on the fitting start side The constant region toward the end is formed on the inclined surface so as to expand toward the end on the fitting start side,
The rubber packing is a rubber packing for sealing, wherein the rubber packing is attached to a parallel outer peripheral surface other than the predetermined region of the protrusion in a tightened state on an inner peripheral surface other than the predetermined region of the rubber packing. Mounting structure. Among the outer peripheral surface of the projecting portion, while a constant region from the tip to the base end is formed on the inclined surface so as to reduce the diameter at an inclination angle α toward the tip,
Of the inner peripheral surface of the rubber packing, a constant region from the end on the fitting start side toward the opposite end is formed on the inclined surface so that the diameter increases toward the end on the fitting start side at an inclination angle β. And
2. The rubber gasket mounting structure for sealing according to claim 1, wherein the inclination angles α and β are maintained in a relationship of α <β.

Images