Differential Apparatus Cam Portion Vibration Isolation

The patent segments the force transmission path by providing a dedicated force transmission portion on the differential case that directly transmits differential restricting force to the output member, separating this function from the cam portion's primary function of generating axial movement through cam action. This segmentation prevents vibration from the cam portion from being transmitted to the friction surface.

The patent introduces a force transmission portion as an intermediary element between the differential restricting portion and the output member. This intermediary provides a stable, vibration-free transmission path for the differential restricting force, while the cam portion can freely perform its cam action without transmitting vibrations to the force transmission path.

The patent relocates the helical spline portion from the axial outer side to the radial inner side of the gear portion, changing the spatial dimension where the force transmission occurs. This dimensional change allows the apparatus to achieve the same force transmission function while reducing the axial projection and overall axial size.

Instead of having the helical spline portion project outward in the axial direction as in conventional designs, the patent inverts the arrangement by placing it on the inner radial side, where it can still effectively utilize the meshing reaction force without increasing the axial dimension.