Waterproof connector

Abstract: In a waterproof connector 10 having a housing main body 11 having a plurality of terminal receiving chambers 12, a fitting portion 15 formed in the housing main body 11 and fitted to a mating housing main body, and a protecting portion 23 formed in an opposite side to the fitting portion 15 of the housing main body 11 and protecting a plurality of tube-shaped electric wire inserting portions 16 extended from the terminal receiving chamber 12, there is provided a molding sink preventing section 24 formed between the protecting portion 23 and the electric wire inserting portion 16 and all around an outer periphery of the electric wire inserting portion 16, and preventing a molding sink from being generated in the electric wire inserting portion 16 at a time of molding.

Description: BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a waterproof connector which improves water proofing properties between a connector housing and a plurality of electric wires connecting terminals. Description of the Related Art The waterproof connector of this kind is constituted by a connector housing and a plurality of terminal receiving chambers provided in this connector housing, and is structured such that a male terminal connected to the electric wire is engaged with the terminal receiving chamber. Moreover, a plurality of electric wire inserting portions extended from the terminal receiving chamber is integrally formed in the connector housing, and a wall portion in which each of the electric wire inserting portions is connected by a rib is integrally formed. A rubber plug receiving hole receiving a waterproof rubber plug previously attached to the electric wire due to a press fit or the like is formed in each of the electric wire inserting portions. However, in the conventional waterproof connector as described above, since the wall portion in which each of the electric wire inserting portions is connected by the rib is integrally formed, a "molding sink" is easily generated on an inner surface of each of the electric wire inserting portions at a time of being integrally formed with the connector housing, and an inner diameter of the rubber plug receiving hole is not stabilized. Accordingly, there has been a problem that a water proofing properties between the connector housing and a plurality of electric wires connecting the male terminals by the waterproof rubber plug is reduced. JP-A- 10223301 discloses a waterproof connector according to the preamble of claim 1. SUMMARY OF THE INVENTION The present invention is made for the purpose of solving the problems described above, and an object of the present invention is to provide a waterproof connector which can intend to improve a water proofing property of a waterproof rubber plug. According to the present invention, there is provided a waterproof connector comprising the features of claim 1. According to the waterproof connector, the molding sink is prevented from being generated in the electric wire inserting portion at a time of molding the housing main body by the molding sink preventing section formed between the electric wire inserting portion and the protecting portion and all around the outer periphery of the electric wire inserting portion. Accordingly, since the inner diameter of each of the electric wire inserting portions is stabilized, it is intended to improve a water proofing property. Moreover, the structure is made such that the protecting portion is constituted by a tube-shaped wall portion covering an outer peripheral side of the plurality of electric wire inserting portions, and the molding sink preventing section is constructed by a space portion formed between an inner periphery of the tube-shaped wall portion and an outer periphery of the electric wire inserting portion. According to the waterproof connector, each of the electric wire inserting portions is protected by the tube-shaped wall portion covering the outer peripheral side of each of the electric wire inserting portions, and a rigidity and a strength of the housing main body is secured. Further, since the space portion is formed between the inner periphery of the tube-shaped wall portion and the outer periphery of each of the electric wire inserting portions, no connecting portion such as a rib or the like is provided between the inner periphery of the tube-shaped wall portion and the outer periphery of each of the electric wire inserting portions, so that it is possible to prevent the molding sink from being generated in each of the electric wire inserting portions at a time of forming the housing main body. Accordingly, since the inner diameter of each of the electric wire inserting portions is stabilized, a water proofing property is improved. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view of a waterproof connector according to an embodiment of the present invention; Fig. 2 is an exploded sectional view of the waterproof connection shown in Fig. 1; Fig. 3 is a perspective view of the waterproof connection shown in Fig. 1; Fig. 4 is a side view of a housing main body of the waterproof connection shown in Fig. 1; and Fig. 5 is a sectional view taken along a line V-V in Fig. 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, a description will be given of an embodiment according to the present invention with reference to the accompanying drawings. As shown in Figs. 1 to 3, a waterproof connector 10 is constituted by a synthetic resin housing main body 11 in which a plurality of terminal receiving chambers 12 are integrally formed, a synthetic resin inner housing 13 fitted to an inner portion of the housing main body 11, an annular rubber waterproof packing member 14 arranged between the inner housing 13 and the housing main body 11 so as to waterproof between the housing main body 11 and a mating side housing main body (not shown), and female terminals 21 connected to a plurality of electric wires 20 inserted to the waterproof connector 10. As shown in Figs. 1 and 2, the housing main body 11 is constituted by a substantially rectangular tube-shaped inner cylinder portion 11a and a substantially rectangular tube-shaped outer cylinder portion 11b inward surrounding the inner cylinder portion 11a and is formed in a double box shape in which the inner cylinder portion 11a and the outer cylinder portion 11b form a fitting portion 15 fitted to a mating housing main body (not shown). As shown in Figs. 1 to 3 and 5, a tube-shaped electric wire inserting portion 16 extended from each of the terminal receiving chambers 12 and a tube-shaped wall portion 17 covering an outer peripheral side of the electric wire inserting portions 16 are integrally formed in a connecting portion in a rear side (an opposite side of the fitting portion 15) of the inner cylinder portion 11a and the outer cylinder portion 11b. A rubber plug receiving hole 19 having a circular cross section in which a waterproof rubber plug 18 is received due to a press fit or the like is formed in each of the electric wire inserting portions 16. The waterproof rubber plug 18 is formed in a substantially concavo-convex cylindrical shape comprising an inner peripheral surface 18a and an outer peripheral surface 18b as shown in Fig. 1, and is previously attached to a side of the electric wire 20 together with a female terminal 21 due to a caulking. Moreover, a space portion 22 is formed between an inner periphery 17a of the tube-shaped wall portion 17 and an outer periphery 16a of each of the electric wire inserting portions 16. A protecting portion 23 for protecting each of the electric wire inserting portions 16 is constructed by the tube-shaped wall portion 17 covering an outer peripheral side of each of the electric wire inserting portions 16. Further, a molding sink preventing section 24 preventing a molding sink from being generated in each of the electric wire inserting portions 16 at a time of integrally forming with the housing main body 11 is constructed by the space portion 22 formed between the inner periphery 17a of the tube-shaped wall portion 17 and the outer periphery 16a of each of the electric wire inserting portions 16. Moreover, an engagement hole 25 which an engagement hook 29 of the inner housing 13 is engaged with and disengaged from is formed in the inner cylinder portion 11a of the housing main body 11. An inclined surface 29a is provided in the engagement hook 29 so that a surface engaged with the housing main body 11 is easily engaged with the engagement hole 25 of the inner cylinder portion 11a. Further, a packing receiving portion 27 for receiving the annular rubber packing member 14 is formed at the back of an outer surface side of the inner cylinder portion 11a of the housing 11. As shown in Figs. 1 and 2, the inner housing 13 is formed in a box shape which is open in a side of being fitted to the mating housing main body, by a substantially rectangular tube-shaped body portion 13a fitted to an inner surface side of the inner cylinder portion 11a of the housing main body 11 and a substantially rectangular tube-shaped spacer portion 13b formed integrally with the body portion 13a so as to be bent rearwards therefrom and fitted to an outer surface side of the inner cylinder portion 11a of the housing main body 11. A plurality of partition walls 28 respectively sectioning the terminal receiving chambers 12 of the housing main body 11 between the adjacent terminal receiving chambers 12 are integrally formed on an inner surface of a vertical wall of the body portion 13a. Moreover, the engagement hook 29 is integrally formed in a substantially center portion of the body portion 13a, and an engagement projection 30 engaging the female terminal 21 received in the terminal receiving chamber 12 is integrally formed in a rear end portion of the body portion 13a. In the case of assembling the waterproof connector 10 according to the embodiment described above, at first, the waterproof packing member 14 is inserted to the packing receiving portion 27 of the inner cylinder portion 11a in the housing main body 11. At this time, the waterproof packing member 14 is positioned by the packing receiving portion 27. Next, the body portion 13a of the inner housing 13 is fitted to the inner cylinder portion 11a of the housing main body 11, and the engagement hook 29 of the inner housing 13 is engaged with the engagement hole 25 of the inner cylinder portion 11a in the housing main body 11. Moreover, at this time, a fitting side end surface of the spacer portion 13b in the inner housing 13 forms an inclined surface 13c. Accordingly, the waterproof packing member 14 is gripped and fixed by the inclined surface 13c and the packing receiving portion 27. Next, the female terminal 21 connected to the electric wire 20 is inserted from the electric wire inserting portion 16 of the housing main body 11, and the female terminal 21 is received in the terminal receiving chamber 12. At this time, the female terminal 21 passes through the terminal receiving hole 19 provided in the housing main body, and is received in and engaged with the terminal receiving chamber 12 by the engagement projection 30 provided in the inner housing 13. Moreover, the waterproof rubber plug 18 is inserted and set to the rubber plug receiving hole 19 of the electric wire inserting portion 16 due to a press fit or the like, whereby an assembly is completed. According to the waterproof connector 10, since the tube-shaped wall portion 17 covering the outer surface side of a plurality of electric wire inserting portions 16 is integrally formed with the housing main body 11, it is possible to protect each of the electric wire inserting portions 16 by the tube-shaped wall portion 17, and it is possible to secure a rigidity and a strength of the housing main body 11. Further, since the space portion 22 is formed between the inner periphery 17a of the tube-shaped wall portion 17 and the outer periphery 16a of each of the electric wire inserting portions 16, and no connecting portion such as a rib or the like is provided between the inner periphery 17a of the tube-shaped wall portion 17 and the outer periphery 16a of each of the electric wire inserting portions 16, a molding sink is prevented from being generated in each of the electric wire inserting portions 16 at a time of forming the housing main body 11. Accordingly, since an inner diameter D of the rubber plug receiving hole 19 in each of the electric wire inserting portions 16 is stabilized, it is intended to improve a water proofing properties.

Claims: A waterproof connector (10) comprising: a plurality of terminals (21); at least one electric wire (20), each of the plurality of terminals (21) being connected to one of the at least one electric wires (20); a housing main body (11) comprising a plurality of terminal receiving chambers (12), each of the plurality of terminal receiving chambers (12) receiving the plurality of terminals (21); a fitting portion formed in the housing main body (11) for fitting to a mating housing main body (11); a protecting portion formed opposite to the fitting portion of the housing main body (11), the protecting portion substantially surrounding and being co-extensive with the length of the plurality of tube-shaped electric wire inserting portions (16) in order to protect the plurality of tube-shaped electric wire inserting portions (16); and a molding sink preventing section comprising a space portion (22) defined between the protecting portion and the plurality of tube-shaped electric wire inserting portions (16), the space portion (22) thereby substantially surrounding the plurality of tube-shaped electric wire inserting portions (16), the molding sink preventing section being configured to prevent a molding sink from developing in each of the plurality of tube-shaped electric wire inserting portions during molding, characterized in that the protecting portion comprises a tube-shaped wall portion defining an inner periphery and extending over the plurality of tube-shaped electric wire inserting portions (16), and the space portion (22) being formed between the inner periphery (17a) of the tube-shaped wall portion and the plurality of tube-shaped electric wire inserting portions (16). A waterproof connector (10) according to claim 1, wherein the housing main body (11) is formed in a double box shape in which the fitting portion comprises a substantially rectangular tube-shaped inner cylinder portion (11a), and a substantially rectangular tube-shaped outer cylinder portion (11b) including the inner cylinder portion (11a). A waterproof connector (10) according to claim 2, further comprising: an inner housing (13) fitted to the housing main body (11); and an annular waterproof packing member (14) arranged between the inner housing (13) and the housing main body (11), wherein the waterproof packing member (14) waterproofs with respect to a mating housing main body (11). A waterproof connector (10) according to claim 3, wherein the housing main body (11) has a packing receiving portion receiving the waterproof packing member (14). A waterproof connector (10) according to claim 3 or 4, wherein the inner housing (13) comprises a body portion fitted to an inner surface of the inner cylinder portion (11a); and a spacer portion fitted to an outer surface of the inner cylinder portion (11a), and the body portion and the spacer portion are formed in an open box shape in a side of being fitted to the mating housing main body (11). A waterproof connector (10) according to claim 5, wherein an engagement hook is provided in the body portion of the inner housing (13), and the engagement hook is engaged with and disengaged from an engagement hole provided in the inner cylinder portion of the housing main body (11). A waterproof connector (10) according to claim 5 or 6, wherein the spacer portion has an inclined surface in which an end surface in a side of being fitted to the housing main body (11) is inclined. A waterproof connector (10) according to claim 5, 6 or 7, wherein a partition wall for sectioning the plurality of terminal receiving chambers (12) is provided on an inner surface of a vertical wall of the body portion. A waterproof connector (10) according to any one of claims 3 to 8, wherein the inner housing (13) has an engagement projection, and the engagement projection engages the plurality of terminals (21). A waterproof connector (10) according to any one of the preceding claims, wherein a waterproof rubber plug (18) is attached to the plurality of terminals (21). A waterproof connector (10) according to claim 10, wherein the waterproof rubber plug (18) is formed in a substantially concavo-convex cylindrical shape comprising an inner peripheral surface (18a) and an outer peripheral surface (18b). A waterproof connector (10) according to claim 10 or 11, wherein a rubber plug receiving hole (19) having a sectional circular form in which the plurality of terminals (21) attaching the waterproof rubber plug (18) thereto are received is formed in the electric wire inserting portion (16). A waterproof connector (10) according to claim 6, wherein the engagement hook provided in the inner housing (13) is inclined at an end surface in a direction of the housing main body (11). A waterproof connector (10) according to claim 7, wherein the waterproof packing is gripped and fixed by the packing receiving portion and an inclined surface provided in the spacer portion.

Inventors: FUKUDA MASARU, MURAKAMI TAKAO, FUKUDA, MASARU, MURAKAMI, TAKAO
Applicants: YAZAKI CORP, YAZAKI CORPORATION
Application year: 2001
Main classification: H01R13
IPC codes: H01R13