A system for predictive modeling of wear or damage to a driven gear of an open gear set is provided. A method of developing a predictive model of wear or damage to a driven gear of an open gear set is also provided. The system and method allow for autonomous, non-interfering dynamic collection of data that are used to assist in developing maintenance schedules for large open gear sets. More specifically, it is directed to utilizing data from monitored pinion gears of girth gear sets under full load operating conditions to predict health of a girth gear in the girth gear set.

A system for predictive modeling of wear or damage to a driven gear of an open gear set is provided. A method of developing a predictive model of wear or damage to a driven gear of an open gear set is also provided. The system and method allow for autonomous, non-interfering dynamic collection of data that are used to assist in developing maintenance schedules for large open gear sets. More specifically, it is directed to utilizing data from monitored pinion gears of girth gear sets under full load operating conditions to predict health of a girth gear in the girth gear set.

A deterioration diagnosis apparatus is for a mechanical apparatus including a power transmission mechanism that transmits power via a gear. The deterioration diagnosis apparatus includes: a storing unit that stores, in advance, a trend of change along with the operation of the mechanical apparatus, in consumption rate of an additive contained in lubricant used for the gear; and a determination unit that determines the period to be taken for the consumption rate of the additive to reach a predetermined value, based on the trend of change in the consumption rate of the additive.

A deterioration diagnosis apparatus is for a mechanical apparatus including a power transmission mechanism that transmits power via a gear. The deterioration diagnosis apparatus includes: a storing unit that stores, in advance, a trend of change along with the operation of the mechanical apparatus, in consumption rate of an additive contained in lubricant used for the gear; and a determination unit that determines the period to be taken for the consumption rate of the additive to reach a predetermined value, based on the trend of change in the consumption rate of the additive.

An external gear includes a body, external teeth, a diaphragm, and a strain gauge. The diaphragm extends in a direction intersecting with an axial direction on another side in of the body the axial direction. The strain gauge is on at least one of a surface on one side of the diaphragm in the axial direction and a surface on another side of the diaphragm in the axial direction. The strain gauge is only in a region that is about a half or less of a radial length from one end of the diaphragm in the axial direction to the other end of the diaphragm in the axial direction with a radial midpoint between the one end of the diaphragm in the axial direction and the other end of the diaphragm in the axial direction as a center in a section passing through the central axis.

An external gear includes a body, external teeth, a diaphragm, and a strain gauge. The diaphragm extends in a direction intersecting with an axial direction on another side in of the body the axial direction. The strain gauge is on at least one of a surface on one side of the diaphragm in the axial direction and a surface on another side of the diaphragm in the axial direction. The strain gauge is only in a region that is about a half or less of a radial length from one end of the diaphragm in the axial direction to the other end of the diaphragm in the axial direction with a radial midpoint between the one end of the diaphragm in the axial direction and the other end of the diaphragm in the axial direction as a center in a section passing through the central axis.

Provided is a bending meshing type gear device including a wave generator, an external gear flexibly deformed by the wave generator, and an internal gear meshing with the external gear. The internal gear includes an internal tooth ring portion including an internal tooth formed on an inner periphery, an external connection portion connected to an external member, an easily deformable portion provided between the internal tooth ring portion and the external connection portion, and configured to be more easily deformable than the internal tooth ring portion, and a distortion measurer provided in the easily deformable portion.

Provided is a bending meshing type gear device including a wave generator, an external gear flexibly deformed by the wave generator, and an internal gear meshing with the external gear. The internal gear includes an internal tooth ring portion including an internal tooth formed on an inner periphery, an external connection portion connected to an external member, an easily deformable portion provided between the internal tooth ring portion and the external connection portion, and configured to be more easily deformable than the internal tooth ring portion, and a distortion measurer provided in the easily deformable portion.

A control device for an automatic transmission is provided, which includes a friction engagement element, and a processor configured to execute gear change control logic configured to control a gear change operation by supplying and discharging hydraulic fluid for forming a gear stage to/from the friction engagement element, and lubricant supply control logic configured to control to switching operation of a supply amount of lubricant to the friction engagement element according to an operating state of a vehicle. The processor controls the gear change operation and the switching operation to not overlap with one another.

A control device for an automatic transmission is provided, which includes a friction engagement element, and a processor configured to execute gear change control logic configured to control a gear change operation by supplying and discharging hydraulic fluid for forming a gear stage to/from the friction engagement element, and lubricant supply control logic configured to control to switching operation of a supply amount of lubricant to the friction engagement element according to an operating state of a vehicle. The processor controls the gear change operation and the switching operation to not overlap with one another.