A planetary wheel drive uses: main bushings affixed to a rotatable housing between a stationary spindle permitting the rotatable output housing to rotate with respect to the stationary spindle, and, planet bushings affixed to rotatable planet gear between a planet pin permitting the planet gear to rotate with respect to the planet pin. The main bushings have two sides, a first side which is press fit into the rotatable output housing and a second side which includes a sliding layer which mates with a surface of the stationary housing.

A planetary wheel drive uses a thrust washer residing between a cover and a thrust plate to absorb axial loads. The thrust washer is has a slip fit to the cover. The surface area of the thrust washer engaging the cover is larger than the surface area of the thrust washer engaging the thrust washer.

A rack-and-pinion type steering apparatus 1 comprises a gear case 3 made of aluminum or an aluminum alloy and having a hollow portion 2; a steering shaft 6 rotatably supported by the gear case 3 through rolling bearings 4 and 5; a pinion 7 which is provided integrally on a shaft end portion of the steering shaft 6 and is rotatably supported in the hollow portion 2 by the gear case 3 through the steering shaft 6; a rack bar 9 on which rack teeth 8 meshing with the pinion 7 are formed; a rack guide 10 which is disposed in the hollow portion 2 of the gear case 3 and supports the rack bar 9 slidably; and a spring 11 constituted by a coil spring for pressing the rack guide 10 toward the rack bar 9.

A robot includes a gear device that has a first surface and a second surface which are in a tubular shape around an axis, are disposed inside and outside of each other, and repeatedly come into contact with and separate away from each other with operation of the gear device. The first surface has a first recessed portion and a first projection portion, which extend in a direction having a circumferential direction component around the axis and configure a first uneven pattern, by being alternately arranged in a direction along the axis. The second surface has a second recessed portion and a second projection portion, which extend in the direction having the circumferential direction component around the axis and configure a second uneven pattern that is different from the first uneven pattern, by being alternately arranged in the direction along the axis.

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 an internal gear, an external gear having flexibility and configured to partially mesh with the internal gear, a wave generator configured to be in contact with the external gear and move a meshing position of the internal gear and the external gear in a circumferential direction, and lubricant disposed in at least one of a meshing section of the internal gear and the external gear and a portion where the external gear and the wave generator are in contact with each other. A last non-seizure load of the lubricant is 300 N or more.

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 belt drive for a motor vehicle having at least two toothed pulleys (1) which are spaced apart from one another and having a toothed belt which wraps around them, wherein a positively locking connection is formed between a toothing system of the wraparound means and a toothing system (2) of the toothed pulleys (1), which positively locking connection is of low-friction configuration by an anti-friction agent which acts between the toothing systems is provided. In order for it to be possible to configure a toothed belt inexpensively and without an anti-friction agent, the anti-friction agent is formed in the form of a lubricant-varnish layer (5) which is applied at least to a toothing system (2) of a toothed pulley (1).

Drivelines have double conical bearing joints incorporated therein. The double conical bearing joints provide the drivelines with multiple degrees of freedom and allow the driveline to bear load in any direction. The conical bearing joints of the driveline include polycrystalline diamond bearing surfaces.

This gear has a predetermined chemical composition and has, in a surface-layer part, a texture of tempered martensite and/or tempered bainite and a steel material texture in which retained austenite exists in 1-10% by area percentage and in which a carbide is deposited in at least 5% by area percentage, and the nitrogen content at a depth of 20 m below the surface is 2.0-6.0%. Thus, a gear that achieves even better seizing resistance in a power transmission part subjected to high rotation and high slippage and using a low-kinematic-viscosity lubricating oil is provided.

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.