A gear drive system is provided having a first gear and a second gear. The second gear has a first peripheral portion and a second peripheral portion. A first set of gear teeth can be defined peripherally over the first peripheral portion and/or the second peripheral portion. The first peripheral portion and/or the second peripheral portion can be more resilient, resulting in a first backlash between the first set of gear teeth and the teeth of the first gear, less than a second backlash between the second set of gear teeth and the teeth of the first gear. Each gear tooth of the second gear can have a gear tooth spacing between adjacent gear teeth. The gear tooth spacing over the first peripheral portion and/or the second peripheral portion can be less than the gear tooth spacing at portions other than the first peripheral portion and/or the second peripheral portion.

This anti-backlash gear includes a gear wheel and gear teeth. Each gear tooth comprises first and second flanks, a top face and a bottom face, wherein for each gear tooth each flank extends from the top face to the bottom face, wherein the gear teeth comprise a polymeric material which comprises a repeat unit of form I wherein t1, and w1 independently represent 0 or 1 and v1 represents 0, 1 or 2. For each gear tooth, at least one of said flanks comprises two or more surfaces arranged to form a single protrusion extending along the at least one said flank such that a tooth thickness of each gear tooth varies between the top face and the bottom face of said gear tooth in a direction parallel to an axis of rotation of the gearwheel in operation. In use, the single protrusion is elastically deformable so as to absorb backlash.

This anti-backlash gear includes a gear wheel and gear teeth. Each gear tooth comprises first and second flanks, a top face and a bottom face, wherein for each gear tooth each flank extends from the top face to the bottom face, wherein the gear teeth comprise a polymeric material which comprises a repeat unit of form I wherein t1, and w1 independently represent 0 or 1 and v1 represents 0, 1 or 2. For each gear tooth, at least one of said flanks comprises two or more surfaces arranged to form a single protrusion extending along the at least one said flank such that a tooth thickness of each gear tooth varies between the top face and the bottom face of said gear tooth in a direction parallel to an axis of rotation of the gearwheel in operation. In use, the single protrusion is elastically deformable so as to absorb backlash.

Methods and systems are provided for an adjustable drive gear assembly. In one example, the adjustable drive gear assembly includes a first gear rotatably coupled with a second gear with a spring positioned therebetween. A length of the spring is adjustable by rotating pins engaged with the spring in order to adjust a position of the gears relative to each other.

Methods and systems are provided for an adjustable drive gear assembly. In one example, the adjustable drive gear assembly includes a first gear rotatably coupled with a second gear with a spring positioned therebetween. A length of the spring is adjustable by rotating pins engaged with the spring in order to adjust a position of the gears relative to each other.

A hydraulic type scissors gear may include a first gear having a working chamber formed therein and oil supplied into the working chamber; a second gear provided to be relatively rotatable coaxially with a side surface of the first gear; and a piston supplied with the oil supplied into the working chamber, and moved in the working chamber by pressure of the oil supplied thereinto to apply a force that pushes the second gear in a rotation direction opposite to a rotation direction of the first gear to rotate the second gear.

A hydraulic type scissors gear may include a first gear having a working chamber formed therein and oil supplied into the working chamber; a second gear provided to be relatively rotatable coaxially with a side surface of the first gear; and a piston supplied with the oil supplied into the working chamber, and moved in the working chamber by pressure of the oil supplied thereinto to apply a force that pushes the second gear in a rotation direction opposite to a rotation direction of the first gear to rotate the second gear.

A variety of scissors gear assemblies are disclosed that utilize integral parts or common tools to align teeth of the scissors gear assembly. Methods of use are also disclosed.

A variety of scissors gear assemblies are disclosed that utilize integral parts or common tools to align teeth of the scissors gear assembly. Methods of use are also disclosed.

One object is to provide a speed reducer provided with a buffer mechanism for reducing an external force and capable of reliably measuring a load torque during an operation. A speed reducing device includes a speed reducing mechanism for reducing a rotation speed of an output with respect to an input between an input rotary shaft and an output rotary shaft, a housing that houses the speed reducing mechanism, and a buffer unit formed of an elastic member and having a cushion force acting mainly in a substantially rotational tangential direction. An amount of displacement of the housing generated by the buffer unit is measured by a measurement device.