Electromagnetic shielding structure

#The present invention relates to an electromagnetic shielding structure for connecting electric wires or cables to input and output terminals of a motor and general electronic equipment mounted on, especially, an electric car.

#In the case that electric wires or cables are connected to input and output terminals of a motor mounted on an electric car, a grounding structure, in which a shielding member is grounded by being connected to a structure-attached body such as a casing for accommodating the motor, is employed so as to prevent leakage of electromagnetic waves from the wires or cables to the outside, and conversely, so as to protect the motor from the influence of external electromagnetic waves received from the outside.

#An example of an electromagnetic shielding structure of such a kind is a connector for a shielding cable, which is shown in FIG. 8 and described in Japanese Utility Model Publication Hei. 6-23179. In this connector, a plurality of pin terminals 3 are held by a terminal holding member 2 provided in a metallic cylindrical shell 1. A shielding cable 4 to be connected to this connector is constructed by twisting a plurality of insulated cores 5, which are constituted by conductors 5a, such as copper wires, coated with insulating materials 5b, and then putting a metallic braid 6 around the twisted and insulated cores 5 as a shielding sheet, and further covering the metallic braid 6 with a sheath 7 serving as an outermost layer. The conductors 5a are exposed by peeling such a cable terminal. Each of such conductors 5a is connected to a corresponding one of pin terminals 3.

#FIG. 1 is a side sectional view illustrating a first embodiment of an electromagnetic shielding structure of the invention.

#FIG. 2 is a front sectional view illustrating the first embodiment.

#FIG. 3 is an external view illustrating the first embodiment that is in a post-assembly state.

#Hereinafter, embodiments of an electromagnetic shielding structure of the invention are described in detail with reference to the accompanying drawings.

#FIGS. 1 to 3 are a side sectional view, a front sectional view, and an assembly perspective view illustrating the configuration of a first embodiment, respectively. A structure-attached body B is a body on which this structure is attached, and made of a material such as aluminum, which is not limited herein to a specific material. Practical examples of the structure-attached body B are housings for a motor and various kinds of electronic or electric equipment, which are mounted on an electric car. The structure-attached body B is protected by connecting electric wires 10 to the input and output terminals thereof from the influence of electromagnetic waves. An attaching hole b for attaching this structure to such a structure-attached body B is provided therein.

#The electric wires 10 fixed to such a structure-attached body B by passing an end portion thereof through the structure-attached body B are a set of three wires, as illustrated in these figures, and drawn and arranged in, for instance, a car body in a protection state in which the three wires are bundled and passed through a corrugated tube 15. Usually, the wires 10 are manufactured by extrusion-coating conductors 11, such as copper wires, with insulating materials 12. At each of terminals of such electric wires 10, the conductors 11 are exposed by being peeled therefrom. Then, metal terminal fitting 13 called “LA terminal” is caulked and press-attached to the conductor 11. The conductor 11 is electrically conducted by bolting the metal terminal fitting 13 to the input/output terminal of the motor.