Shielding connector apparatus

1. A shielding connector apparatus comprising:

an equipment-side connector having opposite front and rear ends spaced apart along a fit-on direction, the equipment-side connector having an equipment-side shielding housing, a connector fit-on nut mounted on the equipment-side shielding housing and an equipment-side contact surface defining a substantially loop-shape extending entirely around a periphery of the equipment-side shielding housing and being electrically continuous therewith, the equipment-side contact surface intersecting the fit-on direction; and

an electric wire-side connector with a shielding housing, a fit-on bolt provided on said shielding housing of said electric wire-side connector and being screwed into said connector fit-on nut to fit said electric wire-side connector on said equipment-side connector, an electric wire-side contact surface provided on said shielding housing of said electric wire-side connector defining a substantially loop-shape extending entirely around a periphery of the electric wire-side connector, said electric wire-side contact surface being brought electrically into contact with said equipment-side contact surface when the connectors have reached a fit-on finish position by screwing said fit-on bolt into said connector fit-on nut.

2. The shielding connector apparatus of claim 1 , further comprising a removal prevention ring provided on a surface of said shielding housing of said electric wire-side connector at a fit-on side thereof, the removal prevention ring preventing said fit-on bolt from being removed from the shielding housing of the shielding housing, said electric wire-side contact surface projecting farther than the removal prevention ring in the fit-on direction.

3. The shielding connector apparatus of claim 2 , wherein the equipment-side contact surface has an accommodation concavity, the removal prevention ring being accommodated in the accommodation concavity when the connectors have reached a fit-on finish position by screwing said fit-on bolt into said connector fit-on nut.

4. The shielding connector apparatus of claim 1 , wherein said equipment-side connector and said electric wire-side connector are provided with locking detection connectors; said locking detection connectors being fit together when the connectors have reached the fit-on finish position, one of the locking detection connectors having two fit-on detection terminal fittings, and the other of said locking detection connectors has a shorting terminal the short-circuits said fit-on detection terminal fittings.

5. The shielding connector apparatus of claim 1 , wherein said shielding housing of said electric wire-side connector has a body covering said electric wire-side connector and a front hood forward of said body in said fit-on direction the connectors, the front hood defining a stepped increase in a width of the shielding housing of said electric wire-side connector, a slit being formed at a front-end edge of the front hood and extending in the fit-on direction of the connectors, a fit-on detection projection projecting from the equipment-side shielding housing and penetrating into said slit with a progress of fit-on of the connectors, and a height of the fit-on detection projection being set so that when the housings have reached said fit-on finish position, a front end of said fit-on detection projection is coincident with an outer surface of a step at a boundary between said front-end hood and said body.

6. The shielding connector apparatus of claim 5 , wherein a colored part having a color different from that of said front hood is formed at an inner end of said slit, the colored part being hidden by said front end of said fit-on detection projection when the connectors have reached said fit-on finish position.

7. The shielding connector apparatus of claim 1 , wherein a fit-on detection opening is formed at a predetermined position of said shielding housing of said electric wire-side connector, and a marked portion is formed on said equipment-side shielding housing and being visible when the connectors have reached the fit-on finish position.