JP2009245597A - Service plug - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a service plug capable of limiting backlash of components with a smaller number of components. <P>SOLUTION: A service plug 1 constitutes a power supply circuit breaking device for turning a power supply circuit on/off with mating or demating with a counterpart connector. The plug 1 comprises: a terminal 7 connected with a counterpart terminal; a housing 4 having internal spaces 42, 43 in which the terminal 7 is accommodated; a first cover 6 for preventing the terminal 7 from coming out from an opening 44 by closing the opening 44 communicating with an external space located on one ends of the internal spaces 42, 43; a second cover 5 mounted on a housing 4, covering the first cover 6; and a packing 8 having a ring-shaped portion 81 being placed surrounding the opening 44 and being in close contact with the housing 4 and the second cover 5 and at least one projection portion 82 projected toward a center of the opening 44 from the ring-shaped portion 81 and sandwiched between the first cover 6 and the second cover 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a service plug that opens a power supply circuit to ensure work safety during maintenance of an electrical system.

  In the case of maintaining an electric system such as an electric vehicle, a service plug (see, for example, Patent Document 1) is used to open a power supply circuit to ensure work safety. Examples of this type of service plug include those shown in FIGS.

  As shown in FIG. 8, the service plug 101 is fitted with a mating connector having a pair of mating terminals 127 connected to the opened power circuit, thereby closing the power circuit and disconnecting from the mating connector. The power supply circuit is opened by being detached.

  The service plug 101 includes a terminal 107 fitted to the counterpart terminal 127, a housing 104 having internal spaces 142 and 143 in which the terminal 107 is accommodated, and an external space located at one end of the internal spaces 142 and 143. A first cover 106 that prevents the terminal 107 from coming out of the opening 144 by closing the opening 144 communicating with the first cover 106; and a second cover 105 that is attached to the housing 104 in a state of covering the first cover 106. An annular packing 108 (see FIG. 10) that is disposed so as to surround the opening 144 and keeps the space between the housing 104 and the second cover 105 watertight, and the housing 104 and the housing of the mating connector. An annular second packing 109 that keeps the space tight.

  The terminal 107 is obtained by pressing a conductive metal plate, and a pair of fitting portions 172 respectively fitted to the pair of mating terminals 127 and the pair of fitting portions. And a connecting portion 173 that connects 172 to each other. The terminal 107 is inserted into the internal spaces 142 and 143 from the opening 144.

  The housing 104 is made of an insulating synthetic resin, and a second opening 142a for receiving a pair of mating terminals 127 is provided on the side opposite to the side where the opening 144 is provided. . The pair of mating terminals 127 are inserted into the internal space 142 of the housing 104 from the second opening 142a and inserted into the fitting portion 172 from the insertion port 172a of the fitting portion 172. 172 is fitted. The pair of mating terminals 127 are respectively fitted with the pair of fitting portions 172, whereby the pair of mating terminals 127 are electrically connected via the terminal 107.

Further, as shown in FIGS. 9 and 10, the housing 104 is provided on the outer periphery of the annular groove 145 for attaching the packing 108 provided around the opening 144 and the portion 147 constituting the internal space 142. An annular groove 146 for attaching the second packing 109 is provided. Further, reference numeral 141 in FIG. 10 is a bolt hole into which a bolt for fixing the second cover 105 to the housing 104 is screwed. The housing 104 is configured to accommodate two terminals 107. That is, this service plug 101 is a service plug 101 that opens and closes two power supply circuits simultaneously.
Japanese Patent Laid-Open No. 10-83753

  However, as shown in FIG. 9, the conventional service plug 101 described above has a gap S between the first cover 106 and the second cover 105, and the first cover when the service plug 101 is vibrated. 106 and the terminal 107 rattled, and there was a problem that abnormal noise was generated due to rattling. Further, if the terminal 107 is rattled, the resistance at the contact point with the counterpart terminal 127 is increased, and this rattling is not preferable in terms of safety when using the power circuit breaker. In addition, if each part is designed so that the gap S does not occur, when each part becomes larger than the reference dimension due to a tolerance shift or expands due to thermal deformation, the parts interfere with each other and deform. There was a risk of damage. Furthermore, even when each component is designed so that the gap S does not occur, there is a problem that the gap S may occur due to thermal deformation of the housing 104 or the like.

  Therefore, an object of the present invention is to provide a service plug that can suppress the rattling of each component with a small number of components.

  In order to solve the above-mentioned problem, the invention described in claim 1 closes the power circuit by being fitted with a mating connector having a pair of mating terminals connected to an open power circuit, A service plug that opens the power supply circuit by being disengaged from the mating connector, and (a) a pair of mating portions respectively mated with the pair of mating terminals, and the pair of mating portions (B) a housing having an internal space in which the terminal is accommodated, and (c) closing an opening communicating with an external space located at one end of the internal space. A first cover for preventing the terminal from coming out of the opening, (d) a second cover attached to the housing in a state of covering the first cover, and (e) around the opening. Arranged to surround An annular portion that is in close contact with the housing and the second cover, and at least one protruding from the annular portion toward the center of the opening and sandwiched between the first cover and the second cover A service plug comprising: a packing having a protruding portion.

  According to a second aspect of the present invention, in the first aspect of the present invention, the housing or the second cover is provided with an annular groove to which the annular portion is attached, and the first cover has the protrusion. A recess is provided for positioning the protrusion and positioning the protrusion.

  The invention described in claim 3 is the invention described in claim 1 or 2, wherein the protrusion protrudes toward the first cover and the protrusion protrudes toward the second cover. And at least one of them is provided.

  The invention described in claim 4 is the invention described in any one of claims 1 to 3, wherein the first cover is made of an insulating material, and the second cover is made of a metal material. And the second cover is fixed to the housing by a bolt.

  According to the first aspect of the present invention, an annular portion that is disposed so as to surround the opening and is in close contact with the housing and the second cover, and the center of the opening from the annular portion. And a packing having at least one protruding portion sandwiched between the first cover and the second cover, the packing provides a space between the housing and the second cover. It is possible to provide a service plug that can be waterproof and can suppress rattling of each component, and therefore can suppress rattling of each component with a small number of components.

  According to the invention described in claim 2, the housing or the second cover is provided with an annular groove to which the annular portion is attached, and the protrusion is positioned on the first cover. Since the recess for positioning is provided, it is possible to prevent the packing from being displaced.

  According to the invention described in claim 3, since at least one of the protrusion protruding toward the first cover and the protrusion protruding toward the second cover is provided on the protrusion, Since the protrusions are crushed, rattling of each component can be suppressed without applying a large pressure to each component.

  According to the invention described in claim 4, the first cover is made of an insulating material, the second cover is made of a metal material, and the second cover is fixed to the housing by a bolt. Therefore, the strength of the service plug can be improved, the housing can be prevented from being deformed by heat (prevention of warping or the like), and the second cover can be prevented from coming off the housing. Moreover, the second cover and the terminal can be insulated by the first cover made of an insulating material.

  Hereinafter, a service plug (also called a power circuit breaker) according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a service plug according to an embodiment of the present invention. FIG. 2 is a plan view of the service plug shown in FIG. FIG. 3 is a cross-sectional view taken along line DD in FIG. FIG. 4 is a cross-sectional view taken along the line EE in FIG. FIG. 5 is an enlarged cross-sectional view of part A in FIG. FIG. 6 is a plan view showing a state where the second cover of the service plug shown in FIG. 1 is removed. FIG. 7 is a perspective view showing a first cover of the service plug shown in FIG.

  The service plug 1 of this embodiment is a device that is incorporated in a power supply circuit for supplying power from a battery mounted on an electric vehicle to a load, and opens and closes the power supply circuit as necessary. As shown in FIG. 3, the power supply circuit is closed by being engaged with the mating connector 2 connected to the power supply circuit, and the power supply circuit is opened by being disengaged from the mating connector 2. is there. The service plug 1 is provided with a lever 3 for fitting or releasing the service plug 1 with the mating connector 2. The service plug 1 is a service plug 1 that opens and closes two power supply circuits at the same time by being fitted to or released from one counterpart connector 2.

  The mating connector 2 is made of a pair of mating terminals 27 connected to the electric wires constituting each power circuit (for two circuits) and a synthetic resin housing these two mating terminals 27. And a counterpart housing 24. The counterpart terminal 27 is obtained by pressing a conductive metal plate, and is fitted to a circuit connection portion connected to the electric wire side and a terminal 7 described later of the service plug 1. A rod-shaped electrical connection portion. In addition, the power supply circuit is in an open state with a pair of electrical connection portions not connected to the terminal 7, and the power supply circuit is closed in a state in which a pair of electrical connection portions is connected to the terminal 7 It becomes.

  The service plug 1 includes two sets of terminals 7 to be fitted with the above-described counterpart terminals 27, and housings 4 each having two internal spaces 42 and 43 in which the two sets of terminals 7 are respectively housed. Two sets of the first cover 6 for preventing the terminal 7 from coming out of the opening 44 by closing the opening 44 communicating with the external space located at one end of the inner spaces 42, 43, and the two sets It has the 2nd cover 5 attached to the housing 4 in the state which covered the 1st cover 6, the packing 8, and the 2nd packing 9 attached to multiple places.

  The terminal 7 is obtained by, for example, pressing a conductive metal plate, a pair of fitting portions 72 that are respectively fitted to the pair of mating terminals 27, and a pair of these A connecting portion 73 that connects the fitting portions 72 to each other. The pair of fitting portions 72 are provided in a cylindrical shape capable of accommodating the mating terminal 27 and are arranged with a space therebetween along a direction orthogonal to the central axis direction. The connecting portion connects one end portions of the pair of fitting portions 72. Further, an insertion port 72 a that receives the electrical connection portion of the mating terminal 27 is provided at the other end of each of the pair of fitting portions 72. A contact spring 74 that elastically contacts the electrical connection portion of the mating terminal 27 is attached to the inside of each fitting portion 72. Such a terminal 7 is inserted into the internal spaces 42 and 43 from the opening 44, and one end of the fitting portion 72 and the connecting portion 73 are positioned near the opening 44, and the fitting portion 72. Is housed in the housing 4 in a state in which the other end portion is positioned on the far side of the internal space 42 away from the opening 44. Further, the two sets of terminals 7 are accommodated in the housing 4 in a state in which the pair of fitting portions 72 are arranged in opposite directions.

  The housing 4 is made of an insulating synthetic resin, and houses the pair of internal spaces 42 that house the fitting portions 72 and the connecting portions 73 that connect the pair of internal spaces 42 to each other. An internal space 43 is provided. The internal spaces 42 and 43 are provided at two locations adjacent to each other in correspondence with the two sets of terminals 7 to be accommodated. In addition, the opening 44 communicating with the external space is provided on one end side of the internal spaces 42, 43, and the other end side of each internal space 42, that is, the side opposite to the side where the opening 44 is provided, A second opening 42a communicating with the external space for receiving the electrical connection portion of the side terminal 27 is provided. The pair of mating terminals 27 are inserted into the internal space 42 from the second openings 42 a, inserted into the fitting portion 72 from the insertion opening 72 a, and fitted with the fitting portion 72. Then, the electrical connection portions of the pair of mating terminals 27 are respectively fitted with the pair of fitting portions 72, whereby the pair of mating terminals 27 are electrically connected via the terminal 7, and each power supply circuit Is closed.

  In addition, as shown in FIGS. 5 and 6, the housing 4 includes an annular groove 45 provided around the opening 44 and an internal space 42 for attaching a later-described annular portion 81 of the packing 8. And an annular groove 46 for attaching the second packing 9 provided on the outer periphery of the portion 47 to be provided. In this embodiment, since the two sets of terminals 7 are accommodated in the housing 4, the groove 45 is provided so as to surround the two openings 44. Further, reference numeral 41 in FIG. 6 is a bolt hole into which a bolt 11 for fixing the second cover 5 to the housing 4 is screwed. Such a housing 4 is positioned inside the counterpart housing 24 in a state where the service plug 1 and the counterpart connector 2 are fitted.

  The first cover 6 is made of an insulating material, that is, an insulating synthetic resin. As shown in FIG. 7, the first cover 6 is provided with a plate portion 60 provided in an elliptical shape in plan view, and an outer edge of the plate portion 60. And a wall portion 61 erected from the portion. In addition, the plate portion 60 is provided with a plurality of recesses 62 (four in this embodiment) provided in a recess along the thickness direction and provided in a recess from the outer edge portion of the plate portion 60 toward the center portion. It has been. These recesses 62 are for positioning a protrusion 82 (described later) of the packing 8 to position the protrusion 82. Such a first cover 6 has an opening portion in such a direction that the plate portion 60 comes into contact with one end portions of the fitting portion 72 and the connecting portion 73 and the front end portion of the wall portion 61 is directed to the inner side of the internal spaces 42 and 43. 44 is blocked.

  The second cover 5 is made of a metal material and is provided in a plate shape having a rectangular shape in plan view. The second cover 5 is fixed to the housing 4 with bolts 11 (see FIG. 1).

  Thus, in the present invention, since the second cover 5 is made of a metal material and is fixed to the housing 4 by the bolts 11, the strength of the service plug 1 is improved and the housing 4 is prevented from thermal deformation (preventing warping or the like). ) And the second cover 5 can be prevented from being detached from the housing 4. Moreover, the 2nd cover 5 and the terminal 7 can be insulated with the 1st cover 6 comprised with the insulating material.

  The packing 8 is made of an elastic material having excellent heat resistance, such as synthetic rubber. As shown in FIGS. 5 and 6, the packing 8 is fitted into the groove 45 so as to surround the two openings 44. An annular portion 81 arranged at the center, and protrudes from the annular portion 81 toward the center of the opening 44 and is positioned in the concave portion 62 and sandwiched between the first cover 6 and the second cover 5. There are protrusions 82 (four in this embodiment, one for the first cover 6, a total of eight). The annular portion 81 is kept in close contact with the inner surface of the groove 45 and the second cover 5 to keep the space between the internal spaces 42 and 43 and the second cover 5 watertight. The protruding portion 82 fills a gap S (see FIG. 5) generated between the first cover 6 and the second cover 5, so that each component of the service plug 1, that is, the terminal 7 and the first cover 6, Reduces rattling. Further, the gap S is caused by a clearance set in advance for each component, a tolerance dimensional deviation of each component, and expansion due to thermal deformation of the housing 4 or the like.

  Thus, in the present invention, the packing 8 having the annular portion 81 and the protruding portion 82 can waterproof between the housing 4 and the second cover 5 and suppress rattling of each component of the service plug 1. Can do. Therefore, it is possible to provide the service plug 1 that can suppress the rattling of each component with a small number of components.

  Further, as shown in FIG. 6, the protrusion 82 is provided with a protrusion 83 protruding toward the first cover 6 and a protrusion 83 protruding toward the second cover 5. Since the protrusion 82 is made of an elastic material, it is compressed as a whole by being sandwiched between the first cover 6 and the second cover 5, but the protrusion 83 has a small volume. It is particularly easy to compress. That is, it is easily crushed.

  As described above, in the present invention, since the protrusion 83 is provided on the protruding portion 82, the protrusion 83 is crushed, thereby suppressing rattling of each component without applying a large pressure to each component of the service plug 1. be able to.

  The packing 9 is formed in an annular shape with an elastic material such as synthetic rubber, and is fitted into the groove 46. The packing 9 is in close contact with the inner surface of the groove 46 and the inner surface of the mating housing 24 in a state where the service plug 1 and the mating connector 2 are fitted, so that the outer surface of the housing 4 and the inner surface of the housing 24 are in contact. Keep watertight between the surfaces.

  In the service plug 1 having the above-described configuration, after the terminal 7 is inserted into the internal spaces 42 and 43 of the housing 4 and the first cover 6 is positioned in the opening 44, the packing 8 is fitted into the groove 45 and positioned in the recess 62. Finally, the second cover 5 is fixed to the housing 4 with bolts 11 and assembled. Further, the second packing 9 may be attached at any stage.

  As described above, according to the present invention, it is possible to provide the service plug 1 that can suppress rattling of each component with a small number of components.

  The service plug 1 having the above-described configuration is fitted to the mating connector 2 when the lever 3 is rotated from the position shown in FIGS. That is, the housing 4 is inserted into the mating housing 24, the electrical connection portion of the mating terminal 27 is inserted into the fitting portion 72 of the terminal 7, and the pair of mating terminals 27 are connected via the terminals 7. Electrical connection is made and the power supply circuit is closed. On the other hand, the service plug 1 is released from the mating connector 2 when the lever 3 is rotated in the opposite direction to that during fitting, for example, during maintenance of the electric system of the electric vehicle. ). As a result, the terminal 7 and the counterpart terminal 27 are disconnected, and the power supply circuit is opened. As a result, maintenance of the electrical system can be performed safely.

  In the above-described embodiment, the packing 8 is attached to the housing 4 side. However, in the present invention, a groove is provided in the second cover 5, and the packing 8 is attached to the groove of the second cover 5. It may be a configuration.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

It is a perspective view which shows the service plug which concerns on one embodiment of this invention. FIG. 2 is a plan view of the service plug shown in FIG. 1 as viewed from the direction of arrow C. It is sectional drawing along the DD line in FIG. It is sectional drawing along the EE line in FIG. It is an expanded sectional view of the A section in FIG. It is a top view which shows the state which removed the 2nd cover of the service plug shown by FIG. It is a perspective view which shows the 1st cover of the service plug shown by FIG. It is sectional drawing which shows the conventional service plug. It is an expanded sectional view of the B section in FIG. It is a top view which shows the state which removed the 2nd cover of the service plug shown by FIG.

Explanation of symbols

1 service plug 2 mating connector 4 housing 5 second cover 6 first cover 7 terminal 8 packing 11 bolt 27 mating terminal 42, 43 internal space 44 opening 45 groove 62 recess 72 fitting part 73 coupling part 81 annular part 82 Projection 83 Projection

Claims (4)

A service plug that closes the power circuit by being mated with a mating connector having a pair of mating terminals connected to the open power circuit and opens the power circuit by being unmated with the mating connector Because
(A) a terminal having a pair of fitting portions respectively fitted to the pair of mating terminals, and a connecting portion for connecting the pair of fitting portions;
(B) a housing having an internal space in which the terminal is accommodated;
(C) a first cover for preventing the terminal from coming out of the opening by closing the opening communicating with the external space located at one end of the internal space;
(D) a second cover attached to the housing with the first cover covered;
(E) an annular annular portion that is arranged so as to surround the opening and is in close contact with the housing and the second cover; and projects from the annular portion toward the center of the opening; and the first cover A packing having at least one protrusion sandwiched between the second cover;
Service plug characterized by having.   The housing or the second cover is provided with an annular groove to which the annular portion is attached, and the first cover is provided with a recess for positioning the protrusion and positioning the protrusion. The service plug according to claim 1.   The projection is provided with at least one of a protrusion protruding toward the first cover and a protrusion protruding toward the second cover. Service plug.   The first cover is made of an insulating material, the second cover is made of a metal material, and the second cover is fixed to the housing by a bolt. 3. The service plug according to item 1 of 3.

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