Differential device for vehicle

A vehicle differential device, comprising:

• a pinion gear pair including a first pinion gear and a second pinion gear that have helical teeth of which tooth traces are inclined with respect to an axial direction, and that are meshed with each other;
• a first side gear pair including a first outer gear member that has a cylindrical shape and that meshes with the first pinion gear, and a first inner gear member that is disposed on an inner side of the first outer gear member, the first outer gear member and the first inner gear member being helically spline fitted with each other,
• a second side gear pair including a second outer gear member that has a cylindrical shape and that meshes with the second pinion gear, and a second inner gear member that is disposed on an inner side of the second outer gear member, the second outer gear member and the second inner gear member being helically spline fitted with each other;
• a differential case that includes a cylindrical part in which a retaining hole for rotatably accommodating the first pinion gear and the second pinion gear is formed, and first and second side wall parts;
• a first sliding member that is disposed between the first side gear pair and the first side wall part;
• a second sliding member that is disposed between the second side gear pair and the second side wall part;
• a third sliding member that is disposed between the first side gear pair and the second side gear pair;
• and
• an elastic member that is disposed arrayed with any one of the first to third sliding members, between the first side wall part and the second side wall part within the differential case in a rotation axis direction of the differential case, and that is elastically deformable in the rotation axis direction, wherein
• the elastic member is compressed in the rotation axis direction by the first outer gear member and the second outer gear member, or the first inner gear member and the second inner gear member, both during driving, which is when torque in a forward direction of the vehicle is input to the differential case, and during coasting, which is when the vehicle is traveling forward under inertia, and
• the first sliding member and the second sliding member are restricted from rotating relative to the differential case, and are also movable relative to the differential case in the rotation axis direction.