Limited slip differential device
AssigneesNissan Motor Co., Ltd., GKN Driveline Torque Technology KK
InventorsYuya Haruki, Masaaki Fusegi
Life of this patent
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Abstract
A limited slip differential device has differential gears, a clutch to limit the differential function of the differential gears, and a electromagnetic solenoid including a plunger and a coil. The plunger is set to move forward to engage the clutch by electromagnetic force of the coil in a differential limit state and move backward by a return spring to disengage said clutch in a differential limitless state. The plunger contacts with a contacting member in at least one state of the differential limit state and the differential limitless state, and their contact area is set smaller than a facing area between them in at least the one state.
Claims9
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.
Dependencies are inferred from the claim text.