JP2011120371A - Strain relief structure, and room lamp for vehicle with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a room lamp for a vehicle having a strain relief structure which can be reduced in dimension in an insulation displacement direction. <P>SOLUTION: The room lamp 10 for the vehicle comprises the strain relief structure 1 in which there are arranged a base member 2, an insulation displacement part 51 attached to the base member 2, an electric wire 4 to the insulation displacement part 51 and electrically connected to the insulation displacement part 51, and a pressing member 3 which sandwiches the electric wire 4 insulation-displaced to the insulation displacement part 51 between the base member 2 and itself. While the neighborhood 4b of an insulation-displaced portion 4a which is insulation-displaced to the insulation displacement part 51 of the electric wire 4 is bent in a direction perpendicular to the insulation displacement direction of the insulation-displaced portion 4a, the pressing member 3 sandwiches a separated porion 4c separated from the insulation-displaced portion 4a farther than the neighborhood 4b of the electric wire 4 between the base member 2 and itself. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a strain relief structure in which an electric wire press-contacted to a press-contact portion is pressed by a pressing member, and a vehicle room lamp including the strain relief structure.

  A vehicle room lamp 210 as shown in FIG. 6 is attached to the roof trim of the automobile (see, for example, Patent Document 1).

  As shown in FIG. 6, the vehicle room lamp 210 includes a light source 206, a plurality of electric wires 204 for supplying power to the light source 206, and a switch for turning on / off the power supply to the light source 206. 207, a plurality of bus bars 205 provided with press contact portions 251 to which the electric wires 204 are press-contacted, a synthetic resin base member 202 to which these are attached, and an electric wire 204 press-contacted to the press contact portions 251 are connected to the base member 202. And a pressing member 3 sandwiched between the mounting portion 224 and the mounting portion 224.

  In the vehicle room lamp 210, the base member 202, the press-contact portion 251 of the bus bar 205, the electric wire 204, and the pressing member 203 constitute a “strain relief structure 201”.

  Moreover, the electric wire 204 is press-contacted with the press-contact part 251 arrange | positioned on the mounting part 224 in the state brazed as shown in FIG.6 and FIG.7. That is, the electric wire 204 is a pair of “neighboring portions 204b” of the “pressure contact portion 204a” linearly extending along the arrow Z direction pressed against the pressure contact portion 251; The “proximal portion 204b” is bent in the arrow Y direction parallel to the press-contact direction of the “press-contact portion 204a” to the press-contact portion 251, and is further separated from the “press-contact portion 204a” by a pair of “separation” The portion 204c ”is pressed in a state where the portion 204c is bent in the arrow Z direction so as to be parallel to the“ pressing portion 204a ”.

  Moreover, the arrow Y shown in FIG. 6 thru | or FIG. 9 is a direction parallel to the height direction of the said motor vehicle. An arrow X is a direction parallel to the width direction of the automobile. An arrow Z is a direction parallel to the longitudinal direction of the automobile. Further, the vehicle room lamp 210 shown in FIG. 6 is installed in such a direction that the operation knob 207a of the switch 207 protrudes downward from the roof trim toward the passenger compartment.

  In the above-described “strain relief structure 201”, when the tensile force indicated by the arrows P1 and P2 in FIG. 8 acts on the electric wire 204, that is, the portion led out from the holding member 203 of the electric wire 204 is in the direction of the arrows P1 and P2. When pulled, the electric wire 204 is bent into a crank shape as described above, and a pair of “separating portions 204 c” are sandwiched between the pressing member 203 and the mounting portion 224, thereby The force is prevented from reaching the “pressure contact portion 204a” and the pressure contact portion 251, and the “pressure contact portion 204a” and the pressure contact portion 251 are prevented from being damaged.

JP 2005-263078 A

  However, the conventional “strain relief structure 201” and the vehicle room lamp 210 provided with this “strain relief structure 201” have the following problems. That is, in the “strain relief structure 201”, the pair of “neighboring portions 204b” of the electric wire 204 is bent in the direction of the arrow Y along the height direction of the automobile. There is a problem in that the dimension J (shown in FIG. 8) along the arrow Y direction to the ceiling wall 230 of the second wall becomes large. In the vehicle room lamp 210 provided with such a “strain relief structure 201”, the dimension J from the mounting portion 224 to the ceiling wall 230 described above becomes large. When the distance between them is small, there is a problem that it becomes difficult to attach the vehicle room lamp 210 to the roof trim.

  Further, in the “strain relief structure 201”, since the pair of “neighboring portions 204b” of the electric wire 204 is bent in the direction of the arrow Y, the “pressure contact portion 204a” pressed against the pressure contact portion 251 is shown in FIG. As shown by the dotted line, there is a problem that it is easy to move in the direction of coming out of the press contact portion 251, that is, the arrow Y direction, and the press contact reliability is not sufficient.

  Further, in the “strain relief structure 201”, since the pair of “neighboring portions 204b” of the electric wire 204 is bent in the arrow Y direction, the portion led out from the pressing member 203 of the electric wire 204 is the arrow in FIG. When pulling in the P1 and P2 directions, a force Q is generated by which the pressing member 203 is lifted from the placement portion 224, and when the electric wire 204 is pulled very strongly, as shown in FIG. There has been a problem that there is a risk of detachment from the mounting portion 224.

  Accordingly, the present invention focuses on the above-described problems, and an object thereof is to provide a strain relief structure capable of reducing the dimension in the pressure contact direction, and a vehicle room lamp including the strain relief structure. To do.

  In order to achieve the above object, the invention described in claim 1 includes a base member, a press-contact portion attached to the base member, an electric wire that is press-contacted to the press-contact portion and electrically connected to the press-contact portion, In a strain relief structure provided with a pressing member that clamps the electric wire pressure-contacted with the pressure-contacting portion with the base member, a portion near the pressure-contacting portion pressed against the pressure-contacting portion of the electric wire, When the pressure contact portion is pressed against the pressure contact portion, the base portion is spaced apart from the pressure contact portion more than the vicinity portion of the wire in a state of being bent in a direction perpendicular to the pressure contact direction approaching the pressure contact portion. The strain relief structure is characterized in that it is sandwiched between a member and the pressing member.

  According to a second aspect of the present invention, in the first aspect of the present invention, the gap between the base member and the pressing member is clamped in a state in which the separation portion is bent in parallel with the pressure contact portion. It is characterized by doing.

  In order to achieve the above object, a third aspect of the present invention is a vehicle room lamp comprising the strain relief structure according to the first or second aspect.

  According to the invention described in claim 1, a pressure contact direction in which a portion near the pressure contact portion pressed against the pressure contact portion of the electric wire is brought close to the pressure contact portion when the pressure contact portion is pressed against the pressure contact portion. In the state where the wire is bent in a direction perpendicular to the wire, a distance portion that is farther from the pressure contact portion than the vicinity portion of the wire is sandwiched between the base member and the pressing member, so that the size in the pressure contact direction is reduced. A strain relief structure can be provided. Further, it is possible to provide a strain relief structure that can prevent the pressure contact portion from coming off from the pressure contact portion and can improve the pressure contact reliability. Further, it is possible to provide a strain relief structure in which it is possible to make it difficult for the pressing member to be lifted from the base member when the electric wire is pulled, and to improve the holding reliability of the pressing member.

  According to the invention described in claim 2, since the spacing portion is sandwiched between the base member and the pressing member in a state of being bent so as to be parallel to the pressure contact portion, the fixing strength of the electric wire can be increased. A strain relief structure that can be further improved can be provided.

  According to the invention described in claim 3, since the strain relief structure according to claim 1 or 2 is provided, it is possible to provide a vehicle room lamp capable of reducing the size in the press-contact direction. it can. Further, it is possible to provide a vehicle room lamp that can prevent the pressure contact portion from coming off from the pressure contact portion and can improve the pressure contact reliability. Further, it is possible to provide a vehicle room lamp that can make it difficult for the pressing member to be lifted from the base member when the electric wire is pulled, and improve the holding reliability of the pressing member.

It is a perspective view of the room lamp for vehicles provided with the strain relief structure concerning one embodiment of the present invention. FIG. 2 is an exploded view of the vehicle room lamp shown in FIG. 1. It is an enlarged view of the press-contact part and electric wire which were shown by FIG. It is sectional drawing along the AA line in FIG. It is sectional drawing along the BB line in FIG. It is an exploded view of the vehicle room lamp provided with the conventional strain relief structure. It is an enlarged view of the press-contact part shown by FIG. 6, and an electric wire. It is explanatory drawing explaining the problem in the strain relief structure shown by FIG. It is explanatory drawing explaining the problem that the electric wire shown in FIG. 8 is pulled, and the pressing member is lifted from the base member.

  A vehicle room lamp 10 including a “strain relief structure 1” according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. The vehicle room lamp 10 of the present invention is a device that is mounted on a lamp mounting opening provided in a roof trim as an interior wall material that covers a vehicle body panel of an automobile and illuminates the passenger compartment of the automobile.

  As shown in FIGS. 1 and 2, the vehicle room lamp 10 includes a light source 6, a plurality of electric wires 4 for supplying power to the light source 6, and power supply to the light source 6. The switch 7 to be turned off, the plurality of bus bars 5 provided with the press-contact portions 51 to which the electric wires 4 are press-contacted, the base member 2 made of synthetic resin for attaching them, and the electric wires 4 press-contacted to the press-contact portions 51 A pressing member 3 sandwiched between the member 2 and the member 2 is provided.

  As shown in FIG. 3, the electric wire 4 is a covered electric wire having a round cross section in which a conductive core wire 41 is covered with an insulating covering portion 42. The electric wire 4 is connected to a power source, and is pressed against the pressure contact portion 51 and electrically connected to the pressure contact portion 51 to supply power to the light source 6.

  The bus bar 5 is formed by punching a metal plate into a predetermined shape and bending it. As shown in FIG. 3, the bus bar 5 is provided with a wiring portion 50 formed in a band shape and a pressure contact portion 51 to which the electric wire 4 is pressed. The routing unit 50 is electrically connected to the light source 6 via the switch 7. The press contact portion 51 includes a bottom plate portion 52 connected to the routing portion 50 and a pair of press contact blades 53 erected in a plate shape from the bottom plate portion 52. Further, the pair of press contact blades 53 are erected from the bottom plate portion 52 in directions facing each other. Each press contact blade 53 is provided with a slit 54 into which the electric wire 4 is inserted. When the electric wire 4 is inserted into the slit 54, the pair of press contact blades 53 break through the covering portion 42 of the electric wire 4 to contact the core wire 41 and are electrically connected to the core wire 41. As described above, in the present invention, the electric wire 4 is inserted into the slit 54 and the press contact blade 53 breaks through the covering portion 42 of the electric wire 4 and comes into contact with the core wire 41. It expresses.

  As shown in FIG. 2, the base member 2 has a light source attachment portion 21 to which the light source 6 is attached, a switch attachment portion 22 to which the switch 7 is attached, a pressure contact portion 51, and a pressure contact for attaching the wire 4 press-contacted to the pressure contact portion 51. And a part mounting part 23. The pressure contact portion mounting portion 23 is formed in the arrow Y direction from both ends of the plate-like placement portion 24 on which the bottom plate portion 52 of the pressure contact portion 51 is placed and the width direction of the placement portion 24, that is, the arrow X direction. A pair of side walls 25 and 26 erected, respectively. Further, locking recesses 27 are provided on the inner surfaces of the pair of side walls 25 and 26 to which the locking protrusions 32 provided on the pressing member 3 are locked. In addition, the press contact portion 51 is arranged in such a manner that a pair of press contact blades 53 are erected from the placement portion 24 in the arrow Y direction, and the pair of press contact blades 53 are in the longitudinal direction of the placement portion 24, that is, the arrow Z direction. , And arranged in a manner facing each other.

  Moreover, the arrow Y shown in FIG. 1 thru | or FIG. 5 is a direction parallel to the height direction of the said motor vehicle. An arrow X is a direction parallel to the width direction of the automobile. An arrow Z is a direction parallel to the longitudinal direction of the automobile. Further, the vehicle room lamp 10 shown in FIG. 1 is mounted in the lamp mounting opening such that the operation knob 7a of the switch 7 protrudes downward from the roof trim toward the passenger compartment.

  The pressing member 3 includes a plate-like ceiling wall 30 facing the mounting portion 24 described above, and a pair of standing walls 31 erected on the mounting portion 24 side from both longitudinal ends of the ceiling wall 30. And is constituted by. Each of the pair of standing walls 31 is provided with the locking protrusion 32 described above. Such a pressing member 3 is attached to the press-contact portion attachment portion 23 by the engagement protrusion 32 being engaged with the engagement recess 27. And the electric wire 4 by which the front-end | tip part apart from the ceiling wall 30 of a pair of standing wall 31 was press-contacted by the press-contact part 51 is clamped between the mounting parts 24. FIG.

  In the vehicular room lamp 10, the power supply from the electric wire 4 to the light source 6 is turned on / off when the operation knob 7 a of the switch 7 is operated by a vehicle occupant. When power supply from the electric wire 4 to the light source 6 is turned on, the light source 6 emits light and the light illuminates the passenger compartment.

  Next, the details of the “strain relief structure 1” of the present invention will be described. In the vehicle room lamp 10, the press contact portion mounting portion 23 of the base member 2, the press contact portion 51 of the bus bar 5, the electric wire 4, and the pressing member 3 constitute the “strain relief structure 1”. Moreover, in this embodiment, the three press-contact parts 51 and the three electric wires 4 are provided.

  As shown in FIG. 2, the three electric wires 4 are brought into pressure contact with the pressure contact portion 51 by approaching the pressure contact portion 51 attached to the pressure contact portion mounting portion 23 along the arrow Y direction. That is, the “pressing direction” to the press contact portion 51 of the electric wire 4 described in the claims is the arrow Y direction in the present embodiment.

  Moreover, these electric wires 4 are press-contacted by the press-contact part 51 in the state brazed as follows. That is, the “neighboring portion 4b” of the “pressure contact portion 4a” linearly extending along the arrow Z direction pressed against the pressure contact portion 51, that is, a pair of “neighboring portions 4b” located on both sides of the “pressure contact portion 4a”. Are bent in the direction of the arrow X perpendicular to the “pressure contact direction”, and a pair of “separation portions 4 c” further away from the “pressure contact portion 4 a” than the “neighboring portion 4 b” are referred to as “pressure contact portions 4 a”. It is pressed in a state bent in the arrow Z direction so as to be parallel. Further, “the separation portion 4c is parallel to the pressure contact portion 4a” means that the axial direction of the separation portion 4c is parallel to the axial direction of the pressure contact portion 4a. That is, the electric wire 4 is press-contacted to the press-contact portion 51 in a state where the electric wire 4 is brazed so as to have a “crank shape” in a plan view. In addition, as shown in FIG. 4, the electric wire 4 pressed in contact with the press contact portion 51 in the brazed state has the axial directions of the “press contact portion 4 a” and the “separation portion 4 c” parallel to the arrow Z direction. Thus, the axial direction of the “vicinity portion 4b” is parallel to the arrow X direction.

  In addition, the pressing member 3 is attached to the press contact portion mounting portion 23, so that the distal end portions of the pair of standing walls 31 away from the ceiling wall 30 are press contacted to the press contact portion 51 as shown in FIG. 5. The four pairs of “separating portions 4 c” are sandwiched between the mounting portion 24.

  In the above-described “strain relief structure 1”, when the tensile force indicated by the arrows R1 and R2 in FIG. 5 acts on the electric wire 4, that is, the portion derived from the holding member 3 of the electric wire 4 is in the direction of the arrows R1 and R2. When pulled, the electric wire 4 is bent into a crank shape as described above, and the pair of “separating portions 4 c” is sandwiched between the pair of standing walls 31 and the mounting portion 24. The tensile force is prevented from reaching the “pressure contact portion 4a” and the pressure contact portion 51, and damage to the “pressure contact portion 4a” and the pressure contact portion 51 is prevented.

  Further, in the “strain relief structure 1”, the electric wire 4 is bent in the crank shape as described above, that is, the “neighboring portion 4b” is not bent in the arrow Y direction, but in the arrow X direction. Therefore, the dimension H along the arrow Y direction from the placing portion 24 to the ceiling wall 30 can be made smaller than that of the conventional product. The vehicle room lamp 10 having such a “strain relief structure 1” has the dimension H along the arrow Y direction from the mounting portion 24 to the ceiling wall 30 described above, that is, along the height direction of the automobile. Since the dimension H can be made smaller than that of the conventional product, it is very advantageous when the distance between the roof trim and the vehicle body panel is small.

  Further, in the above-described “strain relief structure 1”, the electric wire 4 is bent in the crank shape as described above, that is, the “neighboring portion 4b” is not bent in the arrow Y direction, but the arrow X By bending the wire 4 in the direction, even if the wire 4 press-contacted to the pressure contact portion 51 tries to return linearly in the direction of the arrow Z, the direction in which the “pressure contact portion 4a” of the wire 4 comes out of the pressure contact blade 53, that is, the arrow Since it is difficult to move in the Y direction, the pressure contact reliability can be improved as compared with the conventional product.

  Further, in the above-described “strain relief structure 1”, the electric wire 4 is bent in the crank shape as described above, that is, the “neighboring portion 4b” is not bent in the arrow Y direction, but the arrow X When the portion led out from the pressing member 3 of the electric wire 4 is pulled in the directions of arrows R1 and R2 in FIG. 5 by bending in the direction, the pressing member 3 is moved from the mounting portion 24 in the direction of arrow Y. Since the lifting force is unlikely to occur, the holding reliability of the pressing member 3 can be improved as compared with the conventional product.

  In the above-described embodiment, the separation portion 4c is bent so as to be parallel to the pressure contact portion 4a. However, in the strain relief structure of the present invention, the separation portion 4c is parallel to the axial direction of the neighboring portion 4b. As such, the orientation may be continuous with the neighboring portion 4b. That is, the electric wire 4 may be brazed so as to have a “U” shape in a plan view so as to be in pressure contact with the pressure contact portion 51.

  In addition, the “pressure contact portion” of the strain relief structure of the present invention may include at least one “pressure contact blade” that breaks through the coating portion of the electric wire and contacts the core wire of the electric wire.

  The strain relief structure of the present invention can also be applied to electrical components other than the vehicle room lamp 10 described above.

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

DESCRIPTION OF SYMBOLS 1 Strain relief structure 2 Base member 3 Holding member 4 Electric wire 4a Press-contact part 4b Near part 4c Separation part 10 Vehicle room lamp 51 Press-contact part

Claims (3)

A base member, a press-contact portion attached to the base member, an electric wire that is press-contacted to the press-contact portion and electrically connected to the press-contact portion, and the electric wire press-contacted to the press-contact portion between the base member In the strain relief structure provided with a holding member for clamping,
In the state where a portion near the pressure contact portion that is pressed against the pressure contact portion of the electric wire is bent in a direction orthogonal to the pressure contact direction approaching the pressure contact portion when the pressure contact portion is pressed against the pressure contact portion, A strain relief structure characterized in that a spaced-apart portion that is further away from the press-contact portion than the vicinity portion of the electric wire is sandwiched between the base member and the pressing member. 2. The strain relief structure according to claim 1, wherein the spacing portion is sandwiched between the base member and the pressing member in a state where the spacing portion is bent so as to be parallel to the pressure contact portion. A vehicle room lamp comprising the strain relief structure according to claim 1.

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