Differential mechanism

Abstract

To provide a differential mechanism which can shorten a shaft length while positioning a side gear.SOLUTION: A differential mechanism 1 includes: a differential case 5; and a pinion gear 2 and two side gears 3, 4 stored inside the differential case 5. An inner surface facing the side gears 3, 4 among inner surfaces of the differential case 5, and back surfaces 3b, 4b facing the inner surface of the differential case 5 among the side gears 3, 4 are formed in a tapered shape. When a taper angle of the back surfaces 3b, 4b of the side gears 3, 4 is 2λ and an angle formed of a line segment connecting a point B on an outermost periphery side of surfaces to which the back surfaces 3b, 4b of the side gears 3, 4 and the inner surface of the differential case 5 are in contact and a midpoint O of the two side gears 3, 4 on a rotational center axis line L1 of the differential case 5, and the rotational center axis line L1 is γ, the back surfaces 3b, 4b of the side gears 3, 4 and the inner surface of the differential case 5 are formed so as to satisfy λ<(π-γ) / 2.SELECTED DRAWING: Figure 1

Claims

[Claim 1] A differential mechanism comprising a differential case that is rotatable, a pinion gear of a bevel gear that is held rotatably inside the differential case, and two side gears that are housed inside the differential case and are composed of bevel gears that mesh with the pinion gear, The two side gears are arranged side by side in the direction of the rotational axis of the differential case. The inner surface of the differential case facing the side gear and the back surface of the side gear facing the inner surface of the differential case are formed in a tapered shape. The tapered tips on the back surfaces of the two side gears have cylindrical boss portions that protrude in the direction of the rotational axis and are connected to the drive shaft so as to rotate integrally with it. When the taper angle on the back of the side gear is 2λ, and the angle between the line segment connecting the outermost point of the surface where the back of the side gear and the inner surface of the differential case come into contact, and the midpoint of the two side gears on the rotational axis of the differential case, and the rotational axis is γ, λ > (π - γ) / 2 The back surface of the side gear and the inner surface of the differential case are formed to satisfy the following conditions. A differential mechanism characterized by the following features.

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