Patent ID: 9188215
Filing Date: 2015-11-17
Classification: F16H

Abstract:
1. A lubrication structure for a transmission, having: a rotary shaft which is driven to rotate in a predetermined direction, and a plurality of parts requiring lubrication provided on the rotary shaft, at mutually different positions in an axial direction, wherein provided inside the rotary shaft are: a main oil passage that has an entrance at one end of the rotary shaft in the axial direction, and that extends in the axial direction from the entrance; and a plurality of subsidiary oil passages that extend in radial directions at positions in the axial direction corresponding to the parts requiring lubrication and that are communicated with an outer circumferential section of the rotary shaft and with the main oil passage; a guide groove including a groove section extending from the vicinity of the entrance of the main oil passage to a side opposite the entrance is formed on an inner circumferential surface of the main oil passage; the groove section is provided in an inclined fashion with respect to the axial direction such that lubricating oil inside the groove section is sent toward the side opposite the entrance, by rotation of the rotary shaft in the predetermined direction; of the plurality of subsidiary oil passages, an entrance of the subsidiary oil passage most distant from the entrance of the main oil passage is disposed in the guide groove; an oil hole extending in the axial direction and a positioning hole extending in the radial direction are provided in the rotary shaft; the main oil passage is composed by a cylindrical hollow member having a positioning pin projecting on an outer circumferential surface; the hollow member is fitted into the oil hole in a state where the positioning pin is engaged in the positioning hole; and a bearing that supports the rotary shaft is disposed so as to close off the positioning hole from the outer side in the radial direction.