Patent ID: 7247118
Filing Date: 2007-07-24
Classification: F16H

Abstract:
1. A limited slip differential device comprising: differential gears for obtaining a differential function; a clutch for limiting the differential function of said differential gears; an electromagnetic solenoid that has a plunger which is capable of moving forward to engage said clutch in a differential limit state and moving backward to disengage said clutch in a differential limitless state, and a coil for applying electromagnetic force to said plunger when the coil is energized in the differential limit state, wherein said plunger is configured to be pressed by a return spring so that said clutch is disengaged; and a contacting member to which said plunger is contactable in at least one state of the differential limit state and the differential limitless state, wherein a contact area between said plunger and said contacting member is set smaller than a facing area between said plunger and said contacting member in the differential limit state, wherein said plunger has a tapered portion at a front end portion thereof, the tapered portion including a first steep tapered surface contactable to said contacting member in the differential limit state and a second gradual tapered surface configured to be separated from said contacting member in the differential limit state.