A torsion spring that is used in a throttle valve device increasing and decreasing an opening degree of an intake passage or an exhaust passage of an internal-combustion engine includes: two coil springs connected with each other so that torsion directions are opposite from each other; and a hook disposed between the two coil springs. Of the two coil springs, one side spring arranged at one side in an axial direction biases a valve object to a closing side, and the other side spring arranged at the other side in the axial direction biases the valve object to an opening side. In at least one coil spring of the two coil springs, a dimension of a clearance between the at least one coil spring and the hook connected with each other is larger than an average value of clearances between coil turns of the at least one coil spring.

A biasing assembly used with a VCT device includes a torsional biasing element that is elongated and configured to engage and receive rotational motion from one of a rotor or stator of the VCT device; a rigid element that is configured to engage the other of the rotor of the stator of the VCT device and be inserted within a cavity of a camshaft with the torsional biasing element; a receiving feature that couples the rigid element to the torsional biasing element and inhibits angular movement of the rotor and the stator away from a default angular position, wherein the torsional biasing element and the rigid element are angularly displaced from a resting position to a pre-loaded position when the torsional biasing element and the rigid element engage the rotor and the stator.

A ring gear arrangement, including: a ring gear mount including: a ring gear having at least one internal gear for interaction with one or more gear wheels; a ring gear stator; and, a plurality of couplings which locate the ring gear within the gear stator, each coupling having a drive arm connected to the ring gear and a resiliently deformable connection, wherein the drive arm is movable between a first position in which the ring gear is in a rest position and a second position in which the ring gear has undergone some radial or rotational movement relative to the ring gear stator, wherein movement of the drive arm from a the first position to the second position loads the resiliently deformable connection against the ring gear, wherein the resiliently deformable connection biases the drive arm to return to the first position when in the second position.

In an aspect, a torsional vibration damper is provided, comprising a hub portion that mounts to a crankshaft, an outer ring that includes an inertial mass, a plurality of radial connectors that are elastically deformable and a plurality of spacers that extend circumferentially between the radial connectors and which are elastically deformable by the radial connectors during flexure thereof. The spacers are non-metallic and dissipate energy from deformation via conversion to heat. The plurality of radial connectors have a circumferential spring rate K1a in bending in a circumferential direction about the axis, and have an axial spring rate K1b in bending in an axial direction, wherein K1b is at least 10 times as large as K1a. The plurality of spacers have a circumferential spring rate Kra in the circumferential direction, and an axial spring rate Krb in bending in the axial direction, wherein Kra is less than 1% of K1a.

A drive train assembly (200) for a personal care device (10), comprising a torsion spring (210) suspended between a first end mount (220) and a second end mount (230), the torsion spring comprising a first end mounted to the first end mount and a second end mounted to the second end mount, wherein the first and second ends of the torsion spring each comprises a cross flexure spring hinge (250, 260).

A torsion spring may be formed as a bar spring or helical spring comprising a spring wire of fiber composite material. In some examples, the torsion spring comprises a number of layers of fiber reinforcement, which are impregnated with a matrix material. The layers may comprise tensile-loaded fibers and compression-loaded fibers. Groups of layers of the same loading direction may exist and, seen from an inside to an outside, the group stiffness of at least two groups may differ. Likewise, methods for making such torsion springs of fiber composite material are disclosed.

An assembly for a robot includes a shoulder, an arm rotatably connected to the shoulder, an armor decorative member connected to the arm and located adjacent to the shoulder, and a connection assembly located between and rotatably connected to the arm and the armor decorative member. Relative rotation between the arm and the connection assembly and between the armor decorative member and the connection assembly enables the arm to continue to rotate after an upper end of the armor decorative member comes into contact with the shoulder.

A joint unit, in particular a joint unit of a robot, a joint system, a robot for manipulation and/or transportation, in particular for transportation of an object, a robotic exoskeleton system and a method for manipulation and/or transportation, in particular for transportation of an object, in particular for moving a body. The joint unit has a rotary drive, a gear, at least one spring element and a joint output. The gear has a gear input and a gear output, wherein the gear input is mechanically coupled to the rotary drive and suitable for transformation of the torque provided by the rotary drive. The spring element is mechanically coupled to the gear output and suitable for at least partial storing of the torque provided by the gear output and/or of the torque provided by an external load applied to the joint unit.

A torque rod includes a small ring section to be connected to an engine, a large ring section to be connected to a vehicle body, and a rod section providing a connection between the small ring section and the large ring section. The large ring section includes an outer member connected to the rod section, an inner member to be connected to the vehicle body, and a large ring elastic member providing a connection between the outer member and the inner member. Based on a transmission characteristic map, which is prepared by mapping transmission characteristics of the torque rod that are determined by a rod length, a small ring torsion spring, a large ring spring and a large ring spring ratio as parameters, such a combination of parameters that the transmission characteristics are less than 100 N/mm is selected.

The invention is directed to a hybrid spring device comprising an outer tubular shell, and an inner part enclosed in the outer tubular shell comprising a fiber reinforced plastic material. According to the invention the outer tubular shell is designed as self-supporting part made from a metallic material. The invention further provides suitable methods for producing such types of hybrid spring devices.