A gear is provided that has excellent continuous moldability for practical use, and both high slidability and high durability. The provided gear is a molded resin constructed of a resin composition comprising a thermoplastic resin (A) and cellulose nanofibers (B) with an average fiber diameter of 1000 nm or smaller, and having a number average molecular weight of the thermoplastic resin (A) in the range of 10,000 to 150,000, wherein a sliding surface of the gear with another gear teeth has an arithmetic mean surface roughness Sa of 3.0 μm or lower.

A gear is provided that has excellent continuous moldability for practical use, and both high slidability and high durability. The provided gear is a molded resin constructed of a resin composition comprising a thermoplastic resin (A) and cellulose nanofibers (B) with an average fiber diameter of 1000 nm or smaller, and having a number average molecular weight of the thermoplastic resin (A) in the range of 10,000 to 150,000, wherein a sliding surface of the gear with another gear teeth has an arithmetic mean surface roughness Sa of 3.0 μm or lower.

A power transmission device includes a pin gear having a plurality of power transmission pins that are relatively moved corresponding to a tooth shape formed on an outer gear, a motor arranged in a direction crossing a rotation axis of the pin gear, and generating power to rotate the pin gear, and a motion transfer unit connected to the pin gear and the motor between the pin gear and the motor, and transferring a rotational motion of the motor to a rotational motion of the pin gear.

A power transmission device includes a pin gear having a plurality of power transmission pins that are relatively moved corresponding to a tooth shape formed on an outer gear, a motor arranged in a direction crossing a rotation axis of the pin gear, and generating power to rotate the pin gear, and a motion transfer unit connected to the pin gear and the motor between the pin gear and the motor, and transferring a rotational motion of the motor to a rotational motion of the pin gear.

A torque position-limiting device includes a pivot member affixed to an external substrate, two compressible arms respectively extended from two opposite ends thereof toward each other with a gap defined therebetween and a smoothly curved bearing surface located on an outer side of each elastically compressible arm, and a position-limiting member including a circular pivot hole pivotally coupled to the pivot member, an abutment surface located on an inner perimeter thereof and abutted against each smoothly curved bearing surface of the pivot member and an outer ring gear portion located on an opposing outer perimeter thereof and drivable by an external force to turn the position-limiting member about the pivot member and to further cause generation of a friction force between each smoothly curved bearing surface of the pivot member and the abutment surface of the position-limiting member.

A torque position-limiting device includes a pivot member affixed to an external substrate, two compressible arms respectively extended from two opposite ends thereof toward each other with a gap defined therebetween and a smoothly curved bearing surface located on an outer side of each elastically compressible arm, and a position-limiting member including a circular pivot hole pivotally coupled to the pivot member, an abutment surface located on an inner perimeter thereof and abutted against each smoothly curved bearing surface of the pivot member and an outer ring gear portion located on an opposing outer perimeter thereof and drivable by an external force to turn the position-limiting member about the pivot member and to further cause generation of a friction force between each smoothly curved bearing surface of the pivot member and the abutment surface of the position-limiting member.

A shift drive including an actuating mechanism, a rack, and a gear housing. The actuating mechanism is driven by a driving mechanism. The rack is linked with the actuating mechanism. The rack includes a connection portion connected to the actuating mechanism through a connecting member 301 The gear housing is provided with an induction gear that meshes with the rack. The gear housing includes a track slot includes a take-up release section and a straight rail section, and an end portion of the rack is capable of a recoverable deformation that can slide in or out of the take-up release section and the length of projection of the take-up release section on an extension line in the direction of the length of the straight rail section is less than the length of the track thereof.

The disclosure relates to an apparatus for pressing a rack onto a pinion, with a pressure piece. The pressure piece being arranged within a housing and to be displaceable in an axial direction of a center longitudinal axis. A bearing element is fixed on the housing in the axial direction with respect to the center longitudinal axis. A prestressing element acts in the axial direction. The pressure piece is loaded by the prestressing element which is arranged between the pressure piece and the bearing element with a prestressing force in the axial direction with respect to the center longitudinal axis and directed away from the bearing element. An adjusting ring which is arranged between the bearing element and the pressure piece. At least two inclined faces of the adjusting ring and an adjusting section bear against one another. In order to be able to reduce the production outlay and/or realize a more compact overall design, a force application disk is arranged between the adjusting ring and the adjusting section.

The disclosure relates to an apparatus for pressing a rack onto a pinion, with a pressure piece. The pressure piece being arranged within a housing and to be displaceable in an axial direction of a center longitudinal axis. A bearing element is fixed on the housing in the axial direction with respect to the center longitudinal axis. A prestressing element acts in the axial direction. The pressure piece is loaded by the prestressing element which is arranged between the pressure piece and the bearing element with a prestressing force in the axial direction with respect to the center longitudinal axis and directed away from the bearing element. An adjusting ring which is arranged between the bearing element and the pressure piece. At least two inclined faces of the adjusting ring and an adjusting section bear against one another. In order to be able to reduce the production outlay and/or realize a more compact overall design, a force application disk is arranged between the adjusting ring and the adjusting section.

Systems, methods and apparatus for adjusting the depth of a trench opened by a row unit of an agricultural planter. The row unit includes a trench depth adjustment assembly configured to modify the furrow depth. In one embodiment, the depth adjustment assembly may include a gear box having one or more gears which engage with a gear rack. The gear box may be pivotally connected to a depth adjustment body supporting a rocker that adjusts upward travel of gauge wheel arms. In another embodiment, the depth adjustment assembly may include a depth adjustment arm having a screw receiver that cooperates with a driven screw that adjusts the position of the depth adjustment arm acting on the gauge wheels to adjust trench depth.