JP2013047541A - Seal material mounting structure - Google Patents

Abstract

A technique for improving suppression of misalignment of packing is provided.
A sealing material mounting structure for mounting a packing 50 having elasticity is formed in a packing arrangement groove 26 that goes around the side surface of a cap body 22 of the cap 20. The packing 50 includes a misalignment-preventing convex portion 58 protruding from the packing 50 in a direction perpendicular to the direction in which the packing 50 extends. The cap body 22 has a substantially rectangular shape in cross section, and includes a misalignment prevention concave portion 28 formed continuously from the packing arrangement groove 26 in accordance with the shape of the misalignment prevention convex portion 58. And when the convex part 58 for position shift prevention is mounted | worn with the cap 20, the elongation rate of a pair of 1st side group which opposes in the said rectangular shape, and the elongation rate of another pair of 2nd side group, Are substantially the same.
[Selection] Figure 3

Description

  The present invention relates to a sealing material mounting structure in which a sealing material (packing) having elasticity formed in a closed curve shape such as a polygonal shape or a circular shape is mounted on a side surface of a housing.

  As one of the known sealing material mounting structures of this type, the packing (seal material) fitted in the hollow housing and the hollow housing in which the packing is fitted are prevented from being detached or displaced. There is a technology that enables the packing and the housing to engage normally (see, for example, Patent Document 1). Specifically, as shown in FIG. 10A, in the packing 101, the protrusion 112 is rotated by the external force into the locking hole around the pressure contact surface 111 side pressed against the inside of the housing. The protrusion 112 is formed in a slope shape so as not to interfere with the locking hole when it is pushed into, or the locking hole is formed in a slope shape so as not to interfere with the protrusion 112.

  As another technique, there is a technique for preventing other parts from being assembled while peeling off a seal material in a seal groove formed on a side surface of a housing and causing a twist or the like (see, for example, Patent Document 2). Specifically, as shown in FIG. 10B, in this sealing material mounting structure, the elastic closed seal material 204 is mounted in the sealing groove 221 that goes around the outer surface S of the housing 202. It has become. Further, the sealing material 204 includes a protruding portion 241 that protrudes from the sealing material 204 in a direction perpendicular to the direction in which the sealing material 204 extends. The projecting portion 241 is formed with an alignment hole 241a for positioning when the sealing material 204 is attached to the seal groove 221. In addition, the housing 202 includes a groove 222 formed continuously from the seal groove 221 in accordance with the shape of the protrusion 241, and the groove 222 is inserted into the alignment hole 241 a on the seal material 204 side. An alignment protrusion 222a is formed.

  As another technique, there is a technique for the purpose of stabilizing the sealing performance over the entire circumference of the sealing surface (see, for example, Patent Document 3). In this technique, a seal ring that is elastically sandwiched between a pair of corresponding seal surfaces includes a posture holding portion that is elastically deformed by being pressed by the first seal surface, and an elastic deformation of the posture holding portion. Deformation direction restricting means for restricting the displacement direction to a specific direction is provided, and the seal ring is held in a fixed posture with respect to the pair of seal surfaces by the elastic restoring force of the posture holding portion.

JP 2005-325952 A JP 2010-38329 A JP 2010-65836 A

  By the way, in the technique disclosed in Patent Document 1, it is necessary to receive a plurality of misalignment prevention shapes on the outside, and there has been a demand for improvement in terms of securing space. Moreover, since there is no disclosure about a mechanism for suppressing the positional deviation, there is a problem that it is difficult to apply in the case of different shapes. Similar problems remain with respect to Patent Documents 2 and 3.

  The object of the present invention is made in view of such a situation, and is to provide a technique for solving the above-described problems.

An aspect of the present invention is a seal material mounting structure in which an elastic seal material is mounted in a seal groove that wraps around a side surface of a housing, and the seal material is perpendicular to a direction in which the seal material extends, Providing a projecting portion projecting from the seal material, the housing has a substantially rectangular cross section, and includes a groove portion formed continuously from the seal groove in accordance with the shape of the projecting portion of the seal material, When the sealing material is attached to the housing, the elongation rate of the pair of first side groups facing each other in the rectangular shape is substantially the same as the elongation rate of the other pair of second side groups.
The first side group may be a side group that forms a rectangular long side, and the protruding portion may be formed at the center in the length direction of each of the two sides that form the first side group.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which improves the position shift suppression of packing can be provided.

It is a perspective view of the base connector of the state which the cap and the connector for terminals based on embodiment fit. It is a perspective view of a base connector concerning an embodiment. It is a top view of the connector for terminals based on an embodiment. It is a side view of a cap concerning an embodiment. It is the top view and side view of packing which concern on embodiment. It is a figure for demonstrating the attachment state of the packing to the cap based on embodiment. It is a figure which shows the corner area | region (area | region R of FIG. 6) of the cap based on embodiment. It is a figure for demonstrating the force which acts on packing based on embodiment. It is the figure which showed the force which acts on the corner part of the cap based on embodiment. It is the figure which showed the sealing material mounting structure based on a prior art.

  DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the invention (hereinafter referred to as “embodiments”) will be described with reference to FIGS. Note that the drawings include portions that are schematically exaggerated and omitted for the purpose of easily illustrating the configuration or effects of the invention.

  As shown in FIG. 1, the terminal cable 84 is attached to the base connector 40, and the cap 20 is attached to ensure electrical connection and airtightness. Specifically, as shown in FIG. 2, the base connector 40 is integrally formed of synthetic resin, and the terminal connector fitting portion 44 and the cap 20 into which the terminal connector 30 is inserted and fitted. And a cap fitting portion 42 to be fitted and fitted.

  The cap fitting portion 42 and the terminal connector fitting portion 44 each have a substantially rectangular cross section corresponding to the shapes of the cap 20 and the terminal connector 30. In addition, connector locking pieces 46a are formed on the left and right side surfaces of the cap fitting portion 42 in the figure, and are locked with the connector locking portion 24 of the cap 20 when the cap 20 is mounted. Similarly, connector locking pieces 46 b are formed on the left and right side surfaces of the terminal connector fitting portion 44 in the figure, and when the terminal connector 30 is attached, the connector locking portion 36 is engaged with the connector locking portion 36 of the terminal connector 30. Stop.

  3 shows the cap 20, FIG. 3 (a) shows a state where the packing 50 is attached, and FIG. 3 (b) shows a state where the packing 50 is not attached.

  The cap 20 includes a cylindrical cap body 22 that is a housing, a connector locking portion 24, and a packing arrangement groove 26. Here, the cap main body 22 has a substantially rectangular cross section made of synthetic resin and is formed by integral molding, and the front and rear surfaces in the figure and the left and right sides are symmetrical.

  A packing arrangement groove 26 is formed on the side surface of the cap body 22 which is a portion to be mounted on the cap fitting portion 42, and the packing 50 is mounted so as to go around the side surface portion of the cap body 22. Further, a packing arrangement groove 26 is formed in a concave shape at the center in the left-right direction on the upper side surface 29 of the cap body 22. A convex portion 58 for preventing displacement of the packing 50 is arranged in the packing arrangement groove 26.

  FIG. 4 shows the terminal connector 30 with the packing 50 attached. As illustrated, the terminal connector 30 has a cylindrical housing 32 in which a terminal fitting 80 is housed. A part of the housing 32 constitutes a packing mounting portion 34. When the terminal connector 30 is attached to the base connector 40, the terminal portion 82 of the terminal fitting 80 is disposed inside, and the terminal cable 84 extends outward.

  The packing mounting portion 34 has a structure similar to that of the cap 20 of FIG. 3 as a structure for mounting the packing 50, and a packing arrangement groove (see FIG. (Not shown) is formed.

  FIG. 5 shows a packing 50 that functions as a sealing material, FIG. 5 (a) is a plan view, and FIG. 5 (b) is a side view. As shown in FIG. 5A, the packing 50 is formed in an annular shape by an elastic material such as synthetic rubber. As shown mainly in FIG. 5B, the packing 50 includes a packing main body 52 having an outer shape of an accordion shape in a side view and a convex portion 58 for preventing misalignment in the center of the upper surface 56 in the left-right direction. Yes. That is, the packing 50 has a protruding portion 58 for preventing misalignment that protrudes perpendicularly to the direction in which the packing 50 extends, in other words, protrudes from the packing 50 in the direction opposite to the mounting directions A1 and A2.

  With reference to FIGS. 6-9, the attachment state of the packing 50 to the cap 20 is demonstrated. Since the packing 50 is attached to the terminal connector 30, the description is omitted.

  FIG. 6A is a side view of the cap 20 with the packing 50 attached. Moreover, FIG.6 (b) has shown the state by which the packing 50 was assembled | attached appropriately about JJ sectional drawing of Fig.6 (a). Moreover, FIG.6 (c) has shown the state which the packing 50 has shifted | deviated in the corner part about JJ sectional drawing of Fig.6 (a). Further, FIG. 7 is an enlarged view of the corner region R in FIG. FIG. 8 is a diagram for explaining the stresses F_d1 and F_d2 acting on the packing 50. FIG. Further, FIG. 9 is a diagram showing a combined stress of the stresses F_d1 and F_d2 acting on the corner portion of the cap. The stress F_d1 indicates the stress acting in the center direction on the left and right short sides d1 in the illustration of the packing 50, and the stress F_d2 is the stress acting in the center direction on the upper and lower long sides d2 in the illustration of the packing 50. Is shown.

  When the packing 50 is not assembled properly, a gap d is formed between the cap body 22 and the packing inner wall surface 54 of the cap body 22 as shown in FIG. That is, it will be in the state which is not exhibiting properly as a packing function.

  In general, the stress generated after the packing 50 is attached to the cap 20 varies depending on the elongation rate of the packing 50. In FIG. 8, if the elongation rates of the short side d1 and the long side d2 of the packing 50 are the same, the two stresses F_d1 and F_d2 are substantially the same (F_d1≈F_d2), and as shown in FIG. A combined stress F_s1 is generated in the center direction of the portion r. As a result, the packing 50 is not easily displaced from the cap 20.

  On the other hand, if the elongation rates of the short side d1 and the long side d2 of the packing 50 are different, a difference is generated between the two stresses F_d1 and F_d2. For example, when no countermeasure is taken, as shown in FIG. 9B, the stress F_d1 of the short side d1 is smaller than the stress F_d2 of the long side d2 (F_d1 <F_d2). Therefore, the direction of the composite stress F_s2 is shifted from the center direction of the corner portion r. In the drawing, it is shifted to the right with respect to the center direction. As a result, the packing 50 is easily displaced from the cap 20.

  Therefore, by providing a misalignment prevention shape (the misalignment prevention concave portion 28 and the misalignment prevention convex portion 58) so that the two stresses F_d1 and F_d2 are substantially the same (F_d1≈F_d2), the short side d1 The stress F_d1 becomes high, that is, it becomes difficult to extend, and the effect of suppressing positional deviation is improved. As a result, when the cap 20 is fitted to the base connector 40, the packing 50 can be prevented from being bitten and the workability associated therewith can be improved.

  As described above, according to the present embodiment, by providing the misalignment preventing convex portion 58 and the misalignment preventing concave portion 28 that can equalize the elongation rate of the packing 50 in the front-rear direction and the left-right direction, Misalignment can be suppressed. As a result, when the cap 20 or the terminal connector 30 with the packing 50 is attached to the base connector 40, the packing 50 can be prevented from being caught. Therefore, it is possible to improve work efficiency in the work of assembling the cap 20 and the terminal connector 30 to the base connector 40. Moreover, since a large space is not required, it can be realized with a simple structure.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it is understood by those skilled in the art that various modifications can be made to each of those components and combinations thereof, and such modifications are also within the scope of the present invention. Needless to say, the present invention is applicable to shapes to which the above mechanism can be applied. For example, when the long side d2 is much longer than the short side d1, a plurality of misalignment prevention shapes (the misalignment prevention concave portion 28 and the misalignment prevention convex portion 58) may be provided on one side.

20 Cap 22 Cap body 24 Connector locking portion 26 Packing disposition groove 28 Misalignment prevention recess 29 Upper partial side surface 30 Terminal connector 32 Housing 34 Packing mounting portion 36 Connector locking portion 38 Upper partial side surface 40 Base connector 42 Cap fitting Connector 44 Terminal connector fitting portion 46, 46a, 46b Connector locking piece 50 Packing 52 Packing main body 54 Packing inner wall surface 56 Upper surface 58 Position shift preventing convex portion 80 Terminal fitting 82 Terminal portion 84 Terminal cable r Corner portion

Claims (2)

A sealing material mounting structure in which an elastic sealing material is mounted in a sealing groove that goes around the side of the housing,
The sealing material includes a protruding portion that protrudes from the sealing material in a direction perpendicular to the direction in which the sealing material extends,
The housing has a substantially rectangular shape in cross section, and includes a groove portion formed continuously from the seal groove in accordance with the shape of the protruding portion of the seal material,
When the sealing material is attached to the housing, the elongation rate of the pair of first side groups facing each other in the rectangular shape is substantially the same as the elongation rate of the other pair of second side groups. A sealing material mounting structure characterized by   The first side group is a side group constituting a long side of a rectangular shape, and the protruding portion is formed at the center in the length direction of each of the two sides constituting the first side group. Item 2. A sealing material mounting structure according to Item 1.

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