Two-Wheel-drive/four-wheel-drive switching system for vehicle

A two-wheel-drive/four-wheel-drive switching system for a vehicle, comprising:

• a switching unit provided to either a power transmission mechanism provided between an engine and a front wheel and a power transmission mechanism provided between the engine and a rear wheel for enabling or disabling the transmission of power;
• said power transmission mechanism being provided with a driving shaft coupled to the drive side, a driven shaft fitted to the driving shaft via a circular clearance, plural connecting/disconnecting members inserted in the clearance between the driving shaft and the driven shaft for connecting or disconnecting the driving shaft and the driven shaft by fitting or separating the connecting/disconnecting members to/from the opposite faces of the shafts, a switching mechanism for selectively locating the connecting/disconnecting members in a position wherein the driving shaft and the driven shaft are connected or in a position where they are disconnected and a casing for housing the switching unit;
• an outside flange is provided to an electromagnetic coil forming the switching mechanism;
• a fitting section having a difference in a level to which the outside flange touches is formed in the casing;
• a fitting groove is formed on an inside face at an interval equal to or larger than the thickness of the outside flange and spaced from the fitting section;
• a circlip opposite to the outside flange is inserted into the fitting groove;
• and
• the outside flange is pressed on the fitting section by inserting a circular elastic member between the circlip and the outside flange.