Differential device

Abstract

A differential device includes pinion; pinion shaft; paired side gears connected to paired output shafts and having at outer peripheral portions gear portions meshing with the pinion; and oil introduction passage introducing lubricant oil to mutually-facing surfaces of the side gears. An oil reserving portion facing space adjacent to end surface of the pinion on radially inner side and capable of catching and holding lubricant oil splashed to the space is formed in portion where the pinion and the pinion shaft mutually face, so as to communicate with fitting portion between the pinion and the pinion shaft where they are relatively rotationally slidable. A step portion is formed in at least one of the mutually-facing surfaces, separates part of oil from lubricant flow flowing radially outward along the one surface by centrifugal force, and guides the oil into the space.

Description

technical field [0001] The present invention relates to a differential device that distributes and transmits rotational force of a differential case to a pair of output shafts. Background technique [0002] There is a differential device including: a pinion (differential gear) disposed in a differential case; a pinion shaft (differential gear support portion) supported by the differential case and and a pair of side gears (output gears) each having a gear part meshing with a pinion on the outer peripheral part, and the pair of side gears are opposed to each other with the pinion shaft in between, and are respectively connected to a Connected to the output shafts, the differential device distributes and transmits the rotational force of the differential housing to the pair of output shafts. Conventionally, as described in Patent Document 1, the following differential device is known for such a differential device: : An oil storage part is provided at the opposing part of the...

AI Technical Summary

Problems solved by technology

[0007] However, in the conventional device, the lubricating oil introduced between the opposing surfaces of the pair of side gears tends to flow radially outward along the opposing surfaces due to centrifugal force, and therefore, most of the introduced lubricating oil flows directly to the opposing surfaces. Face connected to the outer circumference of the side gear to the side flow of the gear part

Therefore, the lubricating effect on the meshing portion of the side gear and the pinion is sufficiently obtained, but there is a problem that the amount of oil supplied to the above-mentioned oil reservoir is relatively small, and the fitting portion between the pinion and the pinion shaft, that is, Insufficient lubrication of rotating and sliding parts

[0008] Furthermore, regarding the insufficient lubrication of the rotating and sliding part between the pinion and the pinion shaft, for example, the diameter of the side gear is sufficiently larger than that of the pinion so that the number of teeth of the side gear can be set sufficiently larger than that of the small gear. When the number of teeth of the gear is narrowed in the axial direction of the output shaft of the differential case, etc., it may be more obvious especially in severe operating conditions where the pinion rotates at a high speed.

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