A robot includes a first member, a second member provided to be capable of turning with respect to the first member, and a gear device configured to transmit a driving force from one side to the other side of the first member and the second member. The gear device includes internal teeth and external teeth provided halfway in a transmission path of the driving force and configured to mesh with each other and lubricant disposed between the internal teeth and the external teeth. An average grain size of a constituent material of the external teeth is smaller than an average grain size of a constituent material of the internal teeth.

A torque converter management system includes a torque converter having a clutch and a torus. The torque converter management system includes memory hardware that stores instructions, that, when executed on data processing hardware of the system, cause the system to perform operations for protecting the torque converter. The operations include receiving torque converter temperature associated with the torque converter. The operations further include obtaining a torque converter protection schedule including one or more torque converter protective action initiation threshold temperatures each having an associated torque converter protective action and determining whether the torque converter temperature(s) exceeds a first one of the torque converter protective action initiation threshold temperatures. When the first torque converter temperature exceeds the first one of the torque converter protective action initiation threshold temperatures, the system initiates a first torque converter protective action associated with the exceeded first torque converter protective action initiation threshold temperature.

An opening end of an inboard section includes: an end surface composed of a plane positioned farthest from the center of a differential device in the axial direction and perpendicular to the axial direction; a ledge positioned adjacent to the end surface in the circumferential direction of the opening end and closer to the center than the end surface in the axial direction; and a tapered section in a slope shape formed continuing to the inner diameter side of the ledge at the opening end, slanting toward the inner diameter side of the opening end and approaching the center. Lubricating oil supplied to the opening end of the inboard section flows to the tapered section via the ledge and flows from the tapered section into a spiral groove formed on an inner periphery of the inboard section.

A torque converter management system includes a torque converter having a clutch and a torus. The torque converter management system includes memory hardware that stores instructions, that, when executed on data processing hardware of the system, cause the system to perform operations for protecting the torque converter. The operations include receiving torque converter temperature associated with the torque converter. The operations further include obtaining a torque converter protection schedule including one or more torque converter protective action initiation threshold temperatures each having an associated torque converter protective action and determining whether the torque converter temperature(s) exceeds a first one of the torque converter protective action initiation threshold temperatures. When the first torque converter temperature exceeds the first one of the torque converter protective action initiation threshold temperatures, the system initiates a first torque converter protective action associated with the exceeded first torque converter protective action initiation threshold temperature.

A lubrication mechanism of a strain wave gearing is disposed in an interior space of an externally toothed gear and comprises a powder-accommodating bag that stores solid lubricant powder. A diaphragm of the externally toothed gear is repeatedly deflected during the driving of the strain wave gearing. Vibration or deflection is repeatedly imparted to the powder-accommodating bag and the solid lubricant powder is discharged from a powder discharge hole formed in the powder-accommodating bag into the interior space. A site to be lubricated is lubricated with the solid lubricant powder discharged into the interior space. Harmful effects due to a large amount of the solid lubricant powder being supplied to the site to be lubricated at one time can be resolved, and a necessary amount of the solid lubricant powder can be continuously supplied to the site to be lubricated.

A transmission device (1) includes an oil feeder (7) including coil springs (9a, 9b) urging a feeder body (8) in a third direction. The third direction is perpendicular to a first direction and to a second direction, where the first direction is the axial direction of rotation of a pinion (2), and the second direction is a direction of a specific tangent of tangents to a circle being a path of the outermost peripheries of revolving pin rollers (4). The transmission device (1) has less performance decrease in feeding oil to the pin rollers (4) resulting from wear of the feeder body (8).

A wave bearing of a space strain wave gearing device comprises an inner ring formed from a bearing steel, an outer ring formed from a martensitic stainless steel, and balls formed from ceramics. On the inner ring formed from a bearing steel, a ceramic coating formed by an AD method is formed as a rust-preventive coating. In the space strain wave gearing device that adopts solid lubrication (powder lubrication), it is possible to reliably prevent rust from developing on the inner ring formed from a bearing steel of the wave bearing. In a space environment where the temperature greatly changes, appropriate setting of the linear expansion coefficients of the inner ring, the outer ring, and the balls enables a change in the radial gap of the wave bearing to be suppressed to a range that does not interfere with practical use.

A work vehicle includes a gear case in which lubricating oil is stored, and a transmission case positioned rearward of the gear case and in which lubricating oil is stored. The work vehicle also includes a communication passage to allow lubricating oil to flow back and forth between the gear case and the transmission case. A rear port, which is in communication with an interior of the transmission case and is for connection to a communication passage, is lower than a front port that is in communication with the interior of the gear case and is for connection to the communication passage.

Proposed is a rack guide which achieves a stable feed of a lubricant from a rack bar to a lubricant retaining groove when the rack bar slides against the rack guide. A lubricant retaining groove is arranged in the supporting surface, the lubricant retaining groove being configured to extend in a rack guide transverse direction perpendicular to a rack guide longitudinal direction and retain a lubricant located between a rack bar and a supporting surface. The lubricant retaining groove has a ship-bow-shaped lubricant introducing area into which the lubricant is introduced and a lubricant retaining area connected to the lubricant introducing area and configured to retain the lubricant introduced from the lubricant introducing area. The lubricant retaining area of the lubricant retaining groove is provided in a contact area of the supporting surface.

Proposed is a rack guide which achieves a stable feed of a lubricant from a rack bar to a lubricant retaining groove when the rack bar slides against the rack guide. A lubricant retaining groove is arranged in the supporting surface, the lubricant retaining groove being configured to extend in a rack guide transverse direction perpendicular to a rack guide longitudinal direction and retain a lubricant located between a rack bar and a supporting surface. The lubricant retaining groove has a ship-bow-shaped lubricant introducing area into which the lubricant is introduced and a lubricant retaining area connected to the lubricant introducing area and configured to retain the lubricant introduced from the lubricant introducing area. The lubricant retaining area of the lubricant retaining groove is provided in a contact area of the supporting surface.